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@@ -0,0 +1,4762 @@
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+/*
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+ * The little filesystem
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+ *
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+ * Copyright (c) 2017, Arm Limited. All rights reserved.
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+ * SPDX-License-Identifier: BSD-3-Clause
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+ */
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+#include "lfs.h"
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+#include "lfs_util.h"
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+
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+#define LFS_BLOCK_NULL ((lfs_block_t)-1)
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+#define LFS_BLOCK_INLINE ((lfs_block_t)-2)
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+
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+/// Caching block device operations ///
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+static inline void lfs_cache_drop(lfs_t *lfs, lfs_cache_t *rcache) {
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+ // do not zero, cheaper if cache is readonly or only going to be
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+ // written with identical data (during relocates)
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+ (void)lfs;
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+ rcache->block = LFS_BLOCK_NULL;
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+}
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+
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+static inline void lfs_cache_zero(lfs_t *lfs, lfs_cache_t *pcache) {
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+ // zero to avoid information leak
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+ memset(pcache->buffer, 0xff, lfs->cfg->cache_size);
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+ pcache->block = LFS_BLOCK_NULL;
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+}
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+
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+static int lfs_bd_read(lfs_t *lfs,
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+ const lfs_cache_t *pcache, lfs_cache_t *rcache, lfs_size_t hint,
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+ lfs_block_t block, lfs_off_t off,
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+ void *buffer, lfs_size_t size) {
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+ uint8_t *data = buffer;
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+ LFS_ASSERT(block != LFS_BLOCK_NULL);
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+ if (off+size > lfs->cfg->block_size) {
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+ return LFS_ERR_CORRUPT;
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+ }
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+
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+ while (size > 0) {
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+ lfs_size_t diff = size;
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+
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+ if (pcache && block == pcache->block &&
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+ off < pcache->off + pcache->size) {
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+ if (off >= pcache->off) {
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+ // is already in pcache?
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+ diff = lfs_min(diff, pcache->size - (off-pcache->off));
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+ memcpy(data, &pcache->buffer[off-pcache->off], diff);
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+
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+ data += diff;
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+ off += diff;
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+ size -= diff;
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+ continue;
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+ }
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+
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+ // pcache takes priority
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+ diff = lfs_min(diff, pcache->off-off);
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+ }
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+
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+ if (block == rcache->block &&
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+ off < rcache->off + rcache->size) {
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+ if (off >= rcache->off) {
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+ // is already in rcache?
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+ diff = lfs_min(diff, rcache->size - (off-rcache->off));
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+ memcpy(data, &rcache->buffer[off-rcache->off], diff);
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+
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+ data += diff;
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+ off += diff;
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+ size -= diff;
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+ continue;
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+ }
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+
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+ // rcache takes priority
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+ diff = lfs_min(diff, rcache->off-off);
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+ }
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+
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+ // load to cache, first condition can no longer fail
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+ LFS_ASSERT(block < lfs->cfg->block_count);
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+ rcache->block = block;
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+ rcache->off = lfs_aligndown(off, lfs->cfg->read_size);
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+ rcache->size = lfs_min(
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+ lfs_min(
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+ lfs_alignup(off+hint, lfs->cfg->read_size),
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+ lfs->cfg->block_size)
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+ - rcache->off,
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+ lfs->cfg->cache_size);
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+ int err = lfs->cfg->read(lfs->cfg, rcache->block,
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+ rcache->off, rcache->buffer, rcache->size);
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+ LFS_ASSERT(err <= 0);
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+ if (err) {
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+ return err;
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+ }
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+ }
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+
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+ return 0;
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+}
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+
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+enum {
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+ LFS_CMP_EQ = 0,
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+ LFS_CMP_LT = 1,
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+ LFS_CMP_GT = 2,
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+};
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+
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+static int lfs_bd_cmp(lfs_t *lfs,
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+ const lfs_cache_t *pcache, lfs_cache_t *rcache, lfs_size_t hint,
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+ lfs_block_t block, lfs_off_t off,
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+ const void *buffer, lfs_size_t size) {
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+ const uint8_t *data = buffer;
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+
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+ for (lfs_off_t i = 0; i < size; i++) {
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+ uint8_t dat;
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+ int err = lfs_bd_read(lfs,
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+ pcache, rcache, hint-i,
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+ block, off+i, &dat, 1);
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+ if (err) {
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+ return err;
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+ }
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+
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+ if (dat != data[i]) {
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+ return (dat < data[i]) ? LFS_CMP_LT : LFS_CMP_GT;
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+ }
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+ }
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+
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+ return LFS_CMP_EQ;
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+}
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+
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+static int lfs_bd_flush(lfs_t *lfs,
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+ lfs_cache_t *pcache, lfs_cache_t *rcache, bool validate) {
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+ if (pcache->block != LFS_BLOCK_NULL && pcache->block != LFS_BLOCK_INLINE) {
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+ LFS_ASSERT(pcache->block < lfs->cfg->block_count);
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+ lfs_size_t diff = lfs_alignup(pcache->size, lfs->cfg->prog_size);
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+ int err = lfs->cfg->prog(lfs->cfg, pcache->block,
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+ pcache->off, pcache->buffer, diff);
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+ LFS_ASSERT(err <= 0);
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+ if (err) {
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+ return err;
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+ }
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+
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+ if (validate) {
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+ // check data on disk
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+ lfs_cache_drop(lfs, rcache);
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+ int res = lfs_bd_cmp(lfs,
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+ NULL, rcache, diff,
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+ pcache->block, pcache->off, pcache->buffer, diff);
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+ if (res < 0) {
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+ return res;
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+ }
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+
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+ if (res != LFS_CMP_EQ) {
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+ return LFS_ERR_CORRUPT;
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+ }
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+ }
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+
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+ lfs_cache_zero(lfs, pcache);
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+ }
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+
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+ return 0;
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+}
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+
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+static int lfs_bd_sync(lfs_t *lfs,
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+ lfs_cache_t *pcache, lfs_cache_t *rcache, bool validate) {
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+ lfs_cache_drop(lfs, rcache);
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+
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+ int err = lfs_bd_flush(lfs, pcache, rcache, validate);
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+ if (err) {
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+ return err;
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+ }
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+
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+ err = lfs->cfg->sync(lfs->cfg);
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+ LFS_ASSERT(err <= 0);
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+ return err;
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+}
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+
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+static int lfs_bd_prog(lfs_t *lfs,
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+ lfs_cache_t *pcache, lfs_cache_t *rcache, bool validate,
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+ lfs_block_t block, lfs_off_t off,
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+ const void *buffer, lfs_size_t size) {
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+ const uint8_t *data = buffer;
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+ LFS_ASSERT(block != LFS_BLOCK_NULL);
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+ LFS_ASSERT(off + size <= lfs->cfg->block_size);
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+
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+ while (size > 0) {
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+ if (block == pcache->block &&
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+ off >= pcache->off &&
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+ off < pcache->off + lfs->cfg->cache_size) {
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+ // already fits in pcache?
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+ lfs_size_t diff = lfs_min(size,
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+ lfs->cfg->cache_size - (off-pcache->off));
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+ memcpy(&pcache->buffer[off-pcache->off], data, diff);
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+
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+ data += diff;
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+ off += diff;
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+ size -= diff;
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+
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+ pcache->size = lfs_max(pcache->size, off - pcache->off);
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+ if (pcache->size == lfs->cfg->cache_size) {
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+ // eagerly flush out pcache if we fill up
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+ int err = lfs_bd_flush(lfs, pcache, rcache, validate);
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+ if (err) {
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+ return err;
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+ }
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+ }
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+
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+ continue;
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+ }
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+
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+ // pcache must have been flushed, either by programming and
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+ // entire block or manually flushing the pcache
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+ LFS_ASSERT(pcache->block == LFS_BLOCK_NULL);
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+
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+ // prepare pcache, first condition can no longer fail
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+ pcache->block = block;
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+ pcache->off = lfs_aligndown(off, lfs->cfg->prog_size);
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+ pcache->size = 0;
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+ }
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+
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+ return 0;
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+}
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+
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+static int lfs_bd_erase(lfs_t *lfs, lfs_block_t block) {
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+ LFS_ASSERT(block < lfs->cfg->block_count);
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+ int err = lfs->cfg->erase(lfs->cfg, block);
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+ LFS_ASSERT(err <= 0);
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+ return err;
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+}
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+
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+
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+/// Small type-level utilities ///
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+// operations on block pairs
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+static inline void lfs_pair_swap(lfs_block_t pair[2]) {
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+ lfs_block_t t = pair[0];
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+ pair[0] = pair[1];
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+ pair[1] = t;
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+}
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+
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+static inline bool lfs_pair_isnull(const lfs_block_t pair[2]) {
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+ return pair[0] == LFS_BLOCK_NULL || pair[1] == LFS_BLOCK_NULL;
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+}
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+
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+static inline int lfs_pair_cmp(
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+ const lfs_block_t paira[2],
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+ const lfs_block_t pairb[2]) {
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+ return !(paira[0] == pairb[0] || paira[1] == pairb[1] ||
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+ paira[0] == pairb[1] || paira[1] == pairb[0]);
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+}
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+
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+static inline bool lfs_pair_sync(
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+ const lfs_block_t paira[2],
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+ const lfs_block_t pairb[2]) {
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+ return (paira[0] == pairb[0] && paira[1] == pairb[1]) ||
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+ (paira[0] == pairb[1] && paira[1] == pairb[0]);
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+}
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+
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+static inline void lfs_pair_fromle32(lfs_block_t pair[2]) {
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+ pair[0] = lfs_fromle32(pair[0]);
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+ pair[1] = lfs_fromle32(pair[1]);
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+}
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+
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+static inline void lfs_pair_tole32(lfs_block_t pair[2]) {
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+ pair[0] = lfs_tole32(pair[0]);
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+ pair[1] = lfs_tole32(pair[1]);
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+}
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+
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+// operations on 32-bit entry tags
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+typedef uint32_t lfs_tag_t;
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+typedef int32_t lfs_stag_t;
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+
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+#define LFS_MKTAG(type, id, size) \
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+ (((lfs_tag_t)(type) << 20) | ((lfs_tag_t)(id) << 10) | (lfs_tag_t)(size))
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+
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+static inline bool lfs_tag_isvalid(lfs_tag_t tag) {
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+ return !(tag & 0x80000000);
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+}
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+
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+static inline bool lfs_tag_isdelete(lfs_tag_t tag) {
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+ return ((int32_t)(tag << 22) >> 22) == -1;
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+}
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+
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+static inline uint16_t lfs_tag_type1(lfs_tag_t tag) {
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+ return (tag & 0x70000000) >> 20;
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+}
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+
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+static inline uint16_t lfs_tag_type3(lfs_tag_t tag) {
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+ return (tag & 0x7ff00000) >> 20;
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+}
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+
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+static inline uint8_t lfs_tag_chunk(lfs_tag_t tag) {
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+ return (tag & 0x0ff00000) >> 20;
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+}
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+
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+static inline int8_t lfs_tag_splice(lfs_tag_t tag) {
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+ return (int8_t)lfs_tag_chunk(tag);
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+}
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+
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+static inline uint16_t lfs_tag_id(lfs_tag_t tag) {
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+ return (tag & 0x000ffc00) >> 10;
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+}
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+
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+static inline lfs_size_t lfs_tag_size(lfs_tag_t tag) {
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+ return tag & 0x000003ff;
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+}
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+
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+static inline lfs_size_t lfs_tag_dsize(lfs_tag_t tag) {
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+ return sizeof(tag) + lfs_tag_size(tag + lfs_tag_isdelete(tag));
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+}
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+
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+// operations on attributes in attribute lists
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+struct lfs_mattr {
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+ lfs_tag_t tag;
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+ const void *buffer;
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+};
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+
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+struct lfs_diskoff {
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+ lfs_block_t block;
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+ lfs_off_t off;
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+};
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+
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+#define LFS_MKATTRS(...) \
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+ (struct lfs_mattr[]){__VA_ARGS__}, \
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+ sizeof((struct lfs_mattr[]){__VA_ARGS__}) / sizeof(struct lfs_mattr)
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+
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+// operations on global state
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+static inline void lfs_gstate_xor(struct lfs_gstate *a,
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+ const struct lfs_gstate *b) {
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+ for (int i = 0; i < 3; i++) {
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+ ((uint32_t*)a)[i] ^= ((const uint32_t*)b)[i];
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+ }
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+}
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+
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+static inline bool lfs_gstate_iszero(const struct lfs_gstate *a) {
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+ for (int i = 0; i < 3; i++) {
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+ if (((uint32_t*)a)[i] != 0) {
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+ return false;
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+ }
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+ }
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+ return true;
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+}
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+
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+static inline bool lfs_gstate_hasorphans(const struct lfs_gstate *a) {
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+ return lfs_tag_size(a->tag);
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+}
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+
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+static inline uint8_t lfs_gstate_getorphans(const struct lfs_gstate *a) {
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+ return lfs_tag_size(a->tag);
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+}
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+
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+static inline bool lfs_gstate_hasmove(const struct lfs_gstate *a) {
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+ return lfs_tag_type1(a->tag);
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+}
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+
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+static inline bool lfs_gstate_hasmovehere(const struct lfs_gstate *a,
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+ const lfs_block_t *pair) {
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+ return lfs_tag_type1(a->tag) && lfs_pair_cmp(a->pair, pair) == 0;
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+}
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+
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+static inline void lfs_gstate_xororphans(struct lfs_gstate *a,
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+ const struct lfs_gstate *b, bool orphans) {
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+ a->tag ^= LFS_MKTAG(0x800, 0, 0) & (b->tag ^ ((uint32_t)orphans << 31));
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+}
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+
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+static inline void lfs_gstate_xormove(struct lfs_gstate *a,
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+ const struct lfs_gstate *b, uint16_t id, const lfs_block_t pair[2]) {
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+ a->tag ^= LFS_MKTAG(0x7ff, 0x3ff, 0) & (b->tag ^ (
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+ (id != 0x3ff) ? LFS_MKTAG(LFS_TYPE_DELETE, id, 0) : 0));
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+ a->pair[0] ^= b->pair[0] ^ ((id != 0x3ff) ? pair[0] : 0);
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+ a->pair[1] ^= b->pair[1] ^ ((id != 0x3ff) ? pair[1] : 0);
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+}
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+
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+static inline void lfs_gstate_fromle32(struct lfs_gstate *a) {
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+ a->tag = lfs_fromle32(a->tag);
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+ a->pair[0] = lfs_fromle32(a->pair[0]);
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+ a->pair[1] = lfs_fromle32(a->pair[1]);
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+}
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+
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+static inline void lfs_gstate_tole32(struct lfs_gstate *a) {
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+ a->tag = lfs_tole32(a->tag);
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+ a->pair[0] = lfs_tole32(a->pair[0]);
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+ a->pair[1] = lfs_tole32(a->pair[1]);
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+}
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+
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+// other endianness operations
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+static void lfs_ctz_fromle32(struct lfs_ctz *ctz) {
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+ ctz->head = lfs_fromle32(ctz->head);
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+ ctz->size = lfs_fromle32(ctz->size);
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+}
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+
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+static void lfs_ctz_tole32(struct lfs_ctz *ctz) {
|
|
|
+ ctz->head = lfs_tole32(ctz->head);
|
|
|
+ ctz->size = lfs_tole32(ctz->size);
|
|
|
+}
|
|
|
+
|
|
|
+static inline void lfs_superblock_fromle32(lfs_superblock_t *superblock) {
|
|
|
+ superblock->version = lfs_fromle32(superblock->version);
|
|
|
+ superblock->block_size = lfs_fromle32(superblock->block_size);
|
|
|
+ superblock->block_count = lfs_fromle32(superblock->block_count);
|
|
|
+ superblock->name_max = lfs_fromle32(superblock->name_max);
|
|
|
+ superblock->file_max = lfs_fromle32(superblock->file_max);
|
|
|
+ superblock->attr_max = lfs_fromle32(superblock->attr_max);
|
|
|
+}
|
|
|
+
|
|
|
+static inline void lfs_superblock_tole32(lfs_superblock_t *superblock) {
|
|
|
+ superblock->version = lfs_tole32(superblock->version);
|
|
|
+ superblock->block_size = lfs_tole32(superblock->block_size);
|
|
|
+ superblock->block_count = lfs_tole32(superblock->block_count);
|
|
|
+ superblock->name_max = lfs_tole32(superblock->name_max);
|
|
|
+ superblock->file_max = lfs_tole32(superblock->file_max);
|
|
|
+ superblock->attr_max = lfs_tole32(superblock->attr_max);
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+/// Internal operations predeclared here ///
|
|
|
+static int lfs_dir_commit(lfs_t *lfs, lfs_mdir_t *dir,
|
|
|
+ const struct lfs_mattr *attrs, int attrcount);
|
|
|
+static int lfs_dir_compact(lfs_t *lfs,
|
|
|
+ lfs_mdir_t *dir, const struct lfs_mattr *attrs, int attrcount,
|
|
|
+ lfs_mdir_t *source, uint16_t begin, uint16_t end);
|
|
|
+static int lfs_file_outline(lfs_t *lfs, lfs_file_t *file);
|
|
|
+static int lfs_file_flush(lfs_t *lfs, lfs_file_t *file);
|
|
|
+static void lfs_fs_preporphans(lfs_t *lfs, int8_t orphans);
|
|
|
+static void lfs_fs_prepmove(lfs_t *lfs,
|
|
|
+ uint16_t id, const lfs_block_t pair[2]);
|
|
|
+static int lfs_fs_pred(lfs_t *lfs, const lfs_block_t dir[2],
|
|
|
+ lfs_mdir_t *pdir);
|
|
|
+static lfs_stag_t lfs_fs_parent(lfs_t *lfs, const lfs_block_t dir[2],
|
|
|
+ lfs_mdir_t *parent);
|
|
|
+static int lfs_fs_relocate(lfs_t *lfs,
|
|
|
+ const lfs_block_t oldpair[2], lfs_block_t newpair[2]);
|
|
|
+static int lfs_fs_forceconsistency(lfs_t *lfs);
|
|
|
+static int lfs_deinit(lfs_t *lfs);
|
|
|
+#ifdef LFS_MIGRATE
|
|
|
+static int lfs1_traverse(lfs_t *lfs,
|
|
|
+ int (*cb)(void*, lfs_block_t), void *data);
|
|
|
+#endif
|
|
|
+
|
|
|
+/// Block allocator ///
|
|
|
+static int lfs_alloc_lookahead(void *p, lfs_block_t block) {
|
|
|
+ lfs_t *lfs = (lfs_t*)p;
|
|
|
+ lfs_block_t off = ((block - lfs->free.off)
|
|
|
+ + lfs->cfg->block_count) % lfs->cfg->block_count;
|
|
|
+
|
|
|
+ if (off < lfs->free.size) {
|
|
|
+ lfs->free.buffer[off / 32] |= 1U << (off % 32);
|
|
|
+ }
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static int lfs_alloc(lfs_t *lfs, lfs_block_t *block) {
|
|
|
+ while (true) {
|
|
|
+ while (lfs->free.i != lfs->free.size) {
|
|
|
+ lfs_block_t off = lfs->free.i;
|
|
|
+ lfs->free.i += 1;
|
|
|
+ lfs->free.ack -= 1;
|
|
|
+
|
|
|
+ if (!(lfs->free.buffer[off / 32] & (1U << (off % 32)))) {
|
|
|
+ // found a free block
|
|
|
+ *block = (lfs->free.off + off) % lfs->cfg->block_count;
|
|
|
+
|
|
|
+ // eagerly find next off so an alloc ack can
|
|
|
+ // discredit old lookahead blocks
|
|
|
+ while (lfs->free.i != lfs->free.size &&
|
|
|
+ (lfs->free.buffer[lfs->free.i / 32]
|
|
|
+ & (1U << (lfs->free.i % 32)))) {
|
|
|
+ lfs->free.i += 1;
|
|
|
+ lfs->free.ack -= 1;
|
|
|
+ }
|
|
|
+
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // check if we have looked at all blocks since last ack
|
|
|
+ if (lfs->free.ack == 0) {
|
|
|
+ LFS_ERROR("No more free space %"PRIu32,
|
|
|
+ lfs->free.i + lfs->free.off);
|
|
|
+ return LFS_ERR_NOSPC;
|
|
|
+ }
|
|
|
+
|
|
|
+ lfs->free.off = (lfs->free.off + lfs->free.size)
|
|
|
+ % lfs->cfg->block_count;
|
|
|
+ lfs->free.size = lfs_min(8*lfs->cfg->lookahead_size, lfs->free.ack);
|
|
|
+ lfs->free.i = 0;
|
|
|
+
|
|
|
+ // find mask of free blocks from tree
|
|
|
+ memset(lfs->free.buffer, 0, lfs->cfg->lookahead_size);
|
|
|
+ int err = lfs_fs_traverse(lfs, lfs_alloc_lookahead, lfs);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+static void lfs_alloc_ack(lfs_t *lfs) {
|
|
|
+ lfs->free.ack = lfs->cfg->block_count;
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+/// Metadata pair and directory operations ///
|
|
|
+static lfs_stag_t lfs_dir_getslice(lfs_t *lfs, const lfs_mdir_t *dir,
|
|
|
+ lfs_tag_t gmask, lfs_tag_t gtag,
|
|
|
+ lfs_off_t goff, void *gbuffer, lfs_size_t gsize) {
|
|
|
+ lfs_off_t off = dir->off;
|
|
|
+ lfs_tag_t ntag = dir->etag;
|
|
|
+ lfs_stag_t gdiff = 0;
|
|
|
+
|
|
|
+ if (lfs_gstate_hasmovehere(&lfs->gstate, dir->pair) &&
|
|
|
+ lfs_tag_id(gtag) <= lfs_tag_id(lfs->gstate.tag)) {
|
|
|
+ // synthetic moves
|
|
|
+ gdiff -= LFS_MKTAG(0, 1, 0);
|
|
|
+ }
|
|
|
+
|
|
|
+ // iterate over dir block backwards (for faster lookups)
|
|
|
+ while (off >= sizeof(lfs_tag_t) + lfs_tag_dsize(ntag)) {
|
|
|
+ off -= lfs_tag_dsize(ntag);
|
|
|
+ lfs_tag_t tag = ntag;
|
|
|
+ int err = lfs_bd_read(lfs,
|
|
|
+ NULL, &lfs->rcache, sizeof(ntag),
|
|
|
+ dir->pair[0], off, &ntag, sizeof(ntag));
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ ntag = (lfs_frombe32(ntag) ^ tag) & 0x7fffffff;
|
|
|
+
|
|
|
+ if (lfs_tag_id(gmask) != 0 &&
|
|
|
+ lfs_tag_type1(tag) == LFS_TYPE_SPLICE &&
|
|
|
+ lfs_tag_id(tag) <= lfs_tag_id(gtag - gdiff)) {
|
|
|
+ if (tag == (LFS_MKTAG(LFS_TYPE_CREATE, 0, 0) |
|
|
|
+ (LFS_MKTAG(0, 0x3ff, 0) & (gtag - gdiff)))) {
|
|
|
+ // found where we were created
|
|
|
+ return LFS_ERR_NOENT;
|
|
|
+ }
|
|
|
+
|
|
|
+ // move around splices
|
|
|
+ gdiff += LFS_MKTAG(0, lfs_tag_splice(tag), 0);
|
|
|
+ }
|
|
|
+
|
|
|
+ if ((gmask & tag) == (gmask & (gtag - gdiff))) {
|
|
|
+ if (lfs_tag_isdelete(tag)) {
|
|
|
+ return LFS_ERR_NOENT;
|
|
|
+ }
|
|
|
+
|
|
|
+ lfs_size_t diff = lfs_min(lfs_tag_size(tag), gsize);
|
|
|
+ err = lfs_bd_read(lfs,
|
|
|
+ NULL, &lfs->rcache, diff,
|
|
|
+ dir->pair[0], off+sizeof(tag)+goff, gbuffer, diff);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ memset((uint8_t*)gbuffer + diff, 0, gsize - diff);
|
|
|
+
|
|
|
+ return tag + gdiff;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ return LFS_ERR_NOENT;
|
|
|
+}
|
|
|
+
|
|
|
+static lfs_stag_t lfs_dir_get(lfs_t *lfs, const lfs_mdir_t *dir,
|
|
|
+ lfs_tag_t gmask, lfs_tag_t gtag, void *buffer) {
|
|
|
+ return lfs_dir_getslice(lfs, dir,
|
|
|
+ gmask, gtag,
|
|
|
+ 0, buffer, lfs_tag_size(gtag));
|
|
|
+}
|
|
|
+
|
|
|
+static int lfs_dir_getread(lfs_t *lfs, const lfs_mdir_t *dir,
|
|
|
+ const lfs_cache_t *pcache, lfs_cache_t *rcache, lfs_size_t hint,
|
|
|
+ lfs_tag_t gmask, lfs_tag_t gtag,
|
|
|
+ lfs_off_t off, void *buffer, lfs_size_t size) {
|
|
|
+ uint8_t *data = buffer;
|
|
|
+ if (off+size > lfs->cfg->block_size) {
|
|
|
+ return LFS_ERR_CORRUPT;
|
|
|
+ }
|
|
|
+
|
|
|
+ while (size > 0) {
|
|
|
+ lfs_size_t diff = size;
|
|
|
+
|
|
|
+ if (pcache && pcache->block == LFS_BLOCK_INLINE &&
|
|
|
+ off < pcache->off + pcache->size) {
|
|
|
+ if (off >= pcache->off) {
|
|
|
+ // is already in pcache?
|
|
|
+ diff = lfs_min(diff, pcache->size - (off-pcache->off));
|
|
|
+ memcpy(data, &pcache->buffer[off-pcache->off], diff);
|
|
|
+
|
|
|
+ data += diff;
|
|
|
+ off += diff;
|
|
|
+ size -= diff;
|
|
|
+ continue;
|
|
|
+ }
|
|
|
+
|
|
|
+ // pcache takes priority
|
|
|
+ diff = lfs_min(diff, pcache->off-off);
|
|
|
+ }
|
|
|
+
|
|
|
+ if (rcache->block == LFS_BLOCK_INLINE &&
|
|
|
+ off < rcache->off + rcache->size) {
|
|
|
+ if (off >= rcache->off) {
|
|
|
+ // is already in rcache?
|
|
|
+ diff = lfs_min(diff, rcache->size - (off-rcache->off));
|
|
|
+ memcpy(data, &rcache->buffer[off-rcache->off], diff);
|
|
|
+
|
|
|
+ data += diff;
|
|
|
+ off += diff;
|
|
|
+ size -= diff;
|
|
|
+ continue;
|
|
|
+ }
|
|
|
+
|
|
|
+ // rcache takes priority
|
|
|
+ diff = lfs_min(diff, rcache->off-off);
|
|
|
+ }
|
|
|
+
|
|
|
+ // load to cache, first condition can no longer fail
|
|
|
+ rcache->block = LFS_BLOCK_INLINE;
|
|
|
+ rcache->off = lfs_aligndown(off, lfs->cfg->read_size);
|
|
|
+ rcache->size = lfs_min(lfs_alignup(off+hint, lfs->cfg->read_size),
|
|
|
+ lfs->cfg->cache_size);
|
|
|
+ int err = lfs_dir_getslice(lfs, dir, gmask, gtag,
|
|
|
+ rcache->off, rcache->buffer, rcache->size);
|
|
|
+ if (err < 0) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static int lfs_dir_traverse_filter(void *p,
|
|
|
+ lfs_tag_t tag, const void *buffer) {
|
|
|
+ lfs_tag_t *filtertag = p;
|
|
|
+ (void)buffer;
|
|
|
+
|
|
|
+ // which mask depends on unique bit in tag structure
|
|
|
+ uint32_t mask = (tag & LFS_MKTAG(0x100, 0, 0))
|
|
|
+ ? LFS_MKTAG(0x7ff, 0x3ff, 0)
|
|
|
+ : LFS_MKTAG(0x700, 0x3ff, 0);
|
|
|
+
|
|
|
+ // check for redundancy
|
|
|
+ if ((mask & tag) == (mask & *filtertag) ||
|
|
|
+ lfs_tag_isdelete(*filtertag) ||
|
|
|
+ (LFS_MKTAG(0x7ff, 0x3ff, 0) & tag) == (
|
|
|
+ LFS_MKTAG(LFS_TYPE_DELETE, 0, 0) |
|
|
|
+ (LFS_MKTAG(0, 0x3ff, 0) & *filtertag))) {
|
|
|
+ return true;
|
|
|
+ }
|
|
|
+
|
|
|
+ // check if we need to adjust for created/deleted tags
|
|
|
+ if (lfs_tag_type1(tag) == LFS_TYPE_SPLICE &&
|
|
|
+ lfs_tag_id(tag) <= lfs_tag_id(*filtertag)) {
|
|
|
+ *filtertag += LFS_MKTAG(0, lfs_tag_splice(tag), 0);
|
|
|
+ }
|
|
|
+
|
|
|
+ return false;
|
|
|
+}
|
|
|
+
|
|
|
+static int lfs_dir_traverse(lfs_t *lfs,
|
|
|
+ const lfs_mdir_t *dir, lfs_off_t off, lfs_tag_t ptag,
|
|
|
+ const struct lfs_mattr *attrs, int attrcount, bool hasseenmove,
|
|
|
+ lfs_tag_t tmask, lfs_tag_t ttag,
|
|
|
+ uint16_t begin, uint16_t end, int16_t diff,
|
|
|
+ int (*cb)(void *data, lfs_tag_t tag, const void *buffer), void *data) {
|
|
|
+ // iterate over directory and attrs
|
|
|
+ while (true) {
|
|
|
+ lfs_tag_t tag;
|
|
|
+ const void *buffer;
|
|
|
+ struct lfs_diskoff disk;
|
|
|
+ if (off+lfs_tag_dsize(ptag) < dir->off) {
|
|
|
+ off += lfs_tag_dsize(ptag);
|
|
|
+ int err = lfs_bd_read(lfs,
|
|
|
+ NULL, &lfs->rcache, sizeof(tag),
|
|
|
+ dir->pair[0], off, &tag, sizeof(tag));
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ tag = (lfs_frombe32(tag) ^ ptag) | 0x80000000;
|
|
|
+ disk.block = dir->pair[0];
|
|
|
+ disk.off = off+sizeof(lfs_tag_t);
|
|
|
+ buffer = &disk;
|
|
|
+ ptag = tag;
|
|
|
+ } else if (attrcount > 0) {
|
|
|
+ tag = attrs[0].tag;
|
|
|
+ buffer = attrs[0].buffer;
|
|
|
+ attrs += 1;
|
|
|
+ attrcount -= 1;
|
|
|
+ } else if (!hasseenmove &&
|
|
|
+ lfs_gstate_hasmovehere(&lfs->gpending, dir->pair)) {
|
|
|
+ // Wait, we have pending move? Handle this here (we need to
|
|
|
+ // or else we risk letting moves fall out of date)
|
|
|
+ tag = lfs->gpending.tag & LFS_MKTAG(0x7ff, 0x3ff, 0);
|
|
|
+ buffer = NULL;
|
|
|
+ hasseenmove = true;
|
|
|
+ } else {
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+
|
|
|
+ lfs_tag_t mask = LFS_MKTAG(0x7ff, 0, 0);
|
|
|
+ if ((mask & tmask & tag) != (mask & tmask & ttag)) {
|
|
|
+ continue;
|
|
|
+ }
|
|
|
+
|
|
|
+ // do we need to filter? inlining the filtering logic here allows
|
|
|
+ // for some minor optimizations
|
|
|
+ if (lfs_tag_id(tmask) != 0) {
|
|
|
+ // scan for duplicates and update tag based on creates/deletes
|
|
|
+ int filter = lfs_dir_traverse(lfs,
|
|
|
+ dir, off, ptag, attrs, attrcount, hasseenmove,
|
|
|
+ 0, 0, 0, 0, 0,
|
|
|
+ lfs_dir_traverse_filter, &tag);
|
|
|
+ if (filter < 0) {
|
|
|
+ return filter;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (filter) {
|
|
|
+ continue;
|
|
|
+ }
|
|
|
+
|
|
|
+ // in filter range?
|
|
|
+ if (!(lfs_tag_id(tag) >= begin && lfs_tag_id(tag) < end)) {
|
|
|
+ continue;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // handle special cases for mcu-side operations
|
|
|
+ if (lfs_tag_type3(tag) == LFS_FROM_NOOP) {
|
|
|
+ // do nothing
|
|
|
+ } else if (lfs_tag_type3(tag) == LFS_FROM_MOVE) {
|
|
|
+ uint16_t fromid = lfs_tag_size(tag);
|
|
|
+ uint16_t toid = lfs_tag_id(tag);
|
|
|
+ int err = lfs_dir_traverse(lfs,
|
|
|
+ buffer, 0, LFS_BLOCK_NULL, NULL, 0, true,
|
|
|
+ LFS_MKTAG(0x600, 0x3ff, 0),
|
|
|
+ LFS_MKTAG(LFS_TYPE_STRUCT, 0, 0),
|
|
|
+ fromid, fromid+1, toid-fromid+diff,
|
|
|
+ cb, data);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ } else if (lfs_tag_type3(tag) == LFS_FROM_USERATTRS) {
|
|
|
+ for (unsigned i = 0; i < lfs_tag_size(tag); i++) {
|
|
|
+ const struct lfs_attr *a = buffer;
|
|
|
+ int err = cb(data, LFS_MKTAG(LFS_TYPE_USERATTR + a[i].type,
|
|
|
+ lfs_tag_id(tag) + diff, a[i].size), a[i].buffer);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ } else {
|
|
|
+ int err = cb(data, tag + LFS_MKTAG(0, diff, 0), buffer);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+static lfs_stag_t lfs_dir_fetchmatch(lfs_t *lfs,
|
|
|
+ lfs_mdir_t *dir, const lfs_block_t pair[2],
|
|
|
+ lfs_tag_t fmask, lfs_tag_t ftag, uint16_t *id,
|
|
|
+ int (*cb)(void *data, lfs_tag_t tag, const void *buffer), void *data) {
|
|
|
+ // we can find tag very efficiently during a fetch, since we're already
|
|
|
+ // scanning the entire directory
|
|
|
+ lfs_stag_t besttag = -1;
|
|
|
+
|
|
|
+ // find the block with the most recent revision
|
|
|
+ uint32_t revs[2] = {0, 0};
|
|
|
+ int r = 0;
|
|
|
+ for (int i = 0; i < 2; i++) {
|
|
|
+ int err = lfs_bd_read(lfs,
|
|
|
+ NULL, &lfs->rcache, sizeof(revs[i]),
|
|
|
+ pair[i], 0, &revs[i], sizeof(revs[i]));
|
|
|
+ revs[i] = lfs_fromle32(revs[i]);
|
|
|
+ if (err && err != LFS_ERR_CORRUPT) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (err != LFS_ERR_CORRUPT &&
|
|
|
+ lfs_scmp(revs[i], revs[(i+1)%2]) > 0) {
|
|
|
+ r = i;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ dir->pair[0] = pair[(r+0)%2];
|
|
|
+ dir->pair[1] = pair[(r+1)%2];
|
|
|
+ dir->rev = revs[(r+0)%2];
|
|
|
+ dir->off = 0; // nonzero = found some commits
|
|
|
+
|
|
|
+ // now scan tags to fetch the actual dir and find possible match
|
|
|
+ for (int i = 0; i < 2; i++) {
|
|
|
+ lfs_off_t off = 0;
|
|
|
+ lfs_tag_t ptag = LFS_BLOCK_NULL;
|
|
|
+
|
|
|
+ uint16_t tempcount = 0;
|
|
|
+ lfs_block_t temptail[2] = {LFS_BLOCK_NULL, LFS_BLOCK_NULL};
|
|
|
+ bool tempsplit = false;
|
|
|
+ lfs_stag_t tempbesttag = besttag;
|
|
|
+
|
|
|
+ dir->rev = lfs_tole32(dir->rev);
|
|
|
+ uint32_t crc = lfs_crc(LFS_BLOCK_NULL, &dir->rev, sizeof(dir->rev));
|
|
|
+ dir->rev = lfs_fromle32(dir->rev);
|
|
|
+
|
|
|
+ while (true) {
|
|
|
+ // extract next tag
|
|
|
+ lfs_tag_t tag;
|
|
|
+ off += lfs_tag_dsize(ptag);
|
|
|
+ int err = lfs_bd_read(lfs,
|
|
|
+ NULL, &lfs->rcache, lfs->cfg->block_size,
|
|
|
+ dir->pair[0], off, &tag, sizeof(tag));
|
|
|
+ if (err) {
|
|
|
+ if (err == LFS_ERR_CORRUPT) {
|
|
|
+ // can't continue?
|
|
|
+ dir->erased = false;
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ crc = lfs_crc(crc, &tag, sizeof(tag));
|
|
|
+ tag = lfs_frombe32(tag) ^ ptag;
|
|
|
+
|
|
|
+ // next commit not yet programmed or we're not in valid range
|
|
|
+ if (!lfs_tag_isvalid(tag) ||
|
|
|
+ off + lfs_tag_dsize(tag) > lfs->cfg->block_size) {
|
|
|
+ dir->erased = (lfs_tag_type1(ptag) == LFS_TYPE_CRC &&
|
|
|
+ dir->off % lfs->cfg->prog_size == 0);
|
|
|
+ break;
|
|
|
+ }
|
|
|
+
|
|
|
+ ptag = tag;
|
|
|
+
|
|
|
+ if (lfs_tag_type1(tag) == LFS_TYPE_CRC) {
|
|
|
+ // check the crc attr
|
|
|
+ uint32_t dcrc;
|
|
|
+ err = lfs_bd_read(lfs,
|
|
|
+ NULL, &lfs->rcache, lfs->cfg->block_size,
|
|
|
+ dir->pair[0], off+sizeof(tag), &dcrc, sizeof(dcrc));
|
|
|
+ if (err) {
|
|
|
+ if (err == LFS_ERR_CORRUPT) {
|
|
|
+ dir->erased = false;
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ dcrc = lfs_fromle32(dcrc);
|
|
|
+
|
|
|
+ if (crc != dcrc) {
|
|
|
+ dir->erased = false;
|
|
|
+ break;
|
|
|
+ }
|
|
|
+
|
|
|
+ // reset the next bit if we need to
|
|
|
+ ptag ^= (lfs_tag_t)(lfs_tag_chunk(tag) & 1U) << 31;
|
|
|
+
|
|
|
+ // toss our crc into the filesystem seed for
|
|
|
+ // pseudorandom numbers
|
|
|
+ lfs->seed ^= crc;
|
|
|
+
|
|
|
+ // update with what's found so far
|
|
|
+ besttag = tempbesttag;
|
|
|
+ dir->off = off + lfs_tag_dsize(tag);
|
|
|
+ dir->etag = ptag;
|
|
|
+ dir->count = tempcount;
|
|
|
+ dir->tail[0] = temptail[0];
|
|
|
+ dir->tail[1] = temptail[1];
|
|
|
+ dir->split = tempsplit;
|
|
|
+
|
|
|
+ // reset crc
|
|
|
+ crc = LFS_BLOCK_NULL;
|
|
|
+ continue;
|
|
|
+ }
|
|
|
+
|
|
|
+ // crc the entry first, hopefully leaving it in the cache
|
|
|
+ for (lfs_off_t j = sizeof(tag); j < lfs_tag_dsize(tag); j++) {
|
|
|
+ uint8_t dat;
|
|
|
+ err = lfs_bd_read(lfs,
|
|
|
+ NULL, &lfs->rcache, lfs->cfg->block_size,
|
|
|
+ dir->pair[0], off+j, &dat, 1);
|
|
|
+ if (err) {
|
|
|
+ if (err == LFS_ERR_CORRUPT) {
|
|
|
+ dir->erased = false;
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ crc = lfs_crc(crc, &dat, 1);
|
|
|
+ }
|
|
|
+
|
|
|
+ // directory modification tags?
|
|
|
+ if (lfs_tag_type1(tag) == LFS_TYPE_NAME) {
|
|
|
+ // increase count of files if necessary
|
|
|
+ if (lfs_tag_id(tag) >= tempcount) {
|
|
|
+ tempcount = lfs_tag_id(tag) + 1;
|
|
|
+ }
|
|
|
+ } else if (lfs_tag_type1(tag) == LFS_TYPE_SPLICE) {
|
|
|
+ tempcount += lfs_tag_splice(tag);
|
|
|
+
|
|
|
+ if (tag == (LFS_MKTAG(LFS_TYPE_DELETE, 0, 0) |
|
|
|
+ (LFS_MKTAG(0, 0x3ff, 0) & tempbesttag))) {
|
|
|
+ tempbesttag |= 0x80000000;
|
|
|
+ } else if (tempbesttag != -1 &&
|
|
|
+ lfs_tag_id(tag) <= lfs_tag_id(tempbesttag)) {
|
|
|
+ tempbesttag += LFS_MKTAG(0, lfs_tag_splice(tag), 0);
|
|
|
+ }
|
|
|
+ } else if (lfs_tag_type1(tag) == LFS_TYPE_TAIL) {
|
|
|
+ tempsplit = (lfs_tag_chunk(tag) & 1);
|
|
|
+
|
|
|
+ err = lfs_bd_read(lfs,
|
|
|
+ NULL, &lfs->rcache, lfs->cfg->block_size,
|
|
|
+ dir->pair[0], off+sizeof(tag), &temptail, 8);
|
|
|
+ if (err) {
|
|
|
+ if (err == LFS_ERR_CORRUPT) {
|
|
|
+ dir->erased = false;
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ lfs_pair_fromle32(temptail);
|
|
|
+ }
|
|
|
+
|
|
|
+ // found a match for our fetcher?
|
|
|
+ if ((fmask & tag) == (fmask & ftag)) {
|
|
|
+ int res = cb(data, tag, &(struct lfs_diskoff){
|
|
|
+ dir->pair[0], off+sizeof(tag)});
|
|
|
+ if (res < 0) {
|
|
|
+ if (res == LFS_ERR_CORRUPT) {
|
|
|
+ dir->erased = false;
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ return res;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (res == LFS_CMP_EQ) {
|
|
|
+ // found a match
|
|
|
+ tempbesttag = tag;
|
|
|
+ } else if ((LFS_MKTAG(0x7ff, 0x3ff, 0) & tag) ==
|
|
|
+ (LFS_MKTAG(0x7ff, 0x3ff, 0) & tempbesttag)) {
|
|
|
+ // found an identical tag, but contents didn't match
|
|
|
+ // this must mean that our besttag has been overwritten
|
|
|
+ tempbesttag = -1;
|
|
|
+ } else if (res == LFS_CMP_GT &&
|
|
|
+ lfs_tag_id(tag) <= lfs_tag_id(tempbesttag)) {
|
|
|
+ // found a greater match, keep track to keep things sorted
|
|
|
+ tempbesttag = tag | 0x80000000;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // consider what we have good enough
|
|
|
+ if (dir->off > 0) {
|
|
|
+ // synthetic move
|
|
|
+ if (lfs_gstate_hasmovehere(&lfs->gstate, dir->pair)) {
|
|
|
+ if (lfs_tag_id(lfs->gstate.tag) == lfs_tag_id(besttag)) {
|
|
|
+ besttag |= 0x80000000;
|
|
|
+ } else if (besttag != -1 &&
|
|
|
+ lfs_tag_id(lfs->gstate.tag) < lfs_tag_id(besttag)) {
|
|
|
+ besttag -= LFS_MKTAG(0, 1, 0);
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // found tag? or found best id?
|
|
|
+ if (id) {
|
|
|
+ *id = lfs_min(lfs_tag_id(besttag), dir->count);
|
|
|
+ }
|
|
|
+
|
|
|
+ if (lfs_tag_isvalid(besttag)) {
|
|
|
+ return besttag;
|
|
|
+ } else if (lfs_tag_id(besttag) < dir->count) {
|
|
|
+ return LFS_ERR_NOENT;
|
|
|
+ } else {
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // failed, try the other block?
|
|
|
+ lfs_pair_swap(dir->pair);
|
|
|
+ dir->rev = revs[(r+1)%2];
|
|
|
+ }
|
|
|
+
|
|
|
+ LFS_ERROR("Corrupted dir pair at %"PRIx32" %"PRIx32,
|
|
|
+ dir->pair[0], dir->pair[1]);
|
|
|
+ return LFS_ERR_CORRUPT;
|
|
|
+}
|
|
|
+
|
|
|
+static int lfs_dir_fetch(lfs_t *lfs,
|
|
|
+ lfs_mdir_t *dir, const lfs_block_t pair[2]) {
|
|
|
+ // note, mask=-1, tag=-1 can never match a tag since this
|
|
|
+ // pattern has the invalid bit set
|
|
|
+ return (int)lfs_dir_fetchmatch(lfs, dir, pair,
|
|
|
+ (lfs_tag_t)-1, (lfs_tag_t)-1, NULL, NULL, NULL);
|
|
|
+}
|
|
|
+
|
|
|
+static int lfs_dir_getgstate(lfs_t *lfs, const lfs_mdir_t *dir,
|
|
|
+ struct lfs_gstate *gstate) {
|
|
|
+ struct lfs_gstate temp;
|
|
|
+ lfs_stag_t res = lfs_dir_get(lfs, dir, LFS_MKTAG(0x7ff, 0, 0),
|
|
|
+ LFS_MKTAG(LFS_TYPE_MOVESTATE, 0, sizeof(temp)), &temp);
|
|
|
+ if (res < 0 && res != LFS_ERR_NOENT) {
|
|
|
+ return res;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (res != LFS_ERR_NOENT) {
|
|
|
+ // xor together to find resulting gstate
|
|
|
+ lfs_gstate_fromle32(&temp);
|
|
|
+ lfs_gstate_xor(gstate, &temp);
|
|
|
+ }
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static int lfs_dir_getinfo(lfs_t *lfs, lfs_mdir_t *dir,
|
|
|
+ uint16_t id, struct lfs_info *info) {
|
|
|
+ if (id == 0x3ff) {
|
|
|
+ // special case for root
|
|
|
+ strcpy(info->name, "/");
|
|
|
+ info->type = LFS_TYPE_DIR;
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+
|
|
|
+ lfs_stag_t tag = lfs_dir_get(lfs, dir, LFS_MKTAG(0x780, 0x3ff, 0),
|
|
|
+ LFS_MKTAG(LFS_TYPE_NAME, id, lfs->name_max+1), info->name);
|
|
|
+ if (tag < 0) {
|
|
|
+ return (int)tag;
|
|
|
+ }
|
|
|
+
|
|
|
+ info->type = lfs_tag_type3(tag);
|
|
|
+
|
|
|
+ struct lfs_ctz ctz;
|
|
|
+ tag = lfs_dir_get(lfs, dir, LFS_MKTAG(0x700, 0x3ff, 0),
|
|
|
+ LFS_MKTAG(LFS_TYPE_STRUCT, id, sizeof(ctz)), &ctz);
|
|
|
+ if (tag < 0) {
|
|
|
+ return (int)tag;
|
|
|
+ }
|
|
|
+ lfs_ctz_fromle32(&ctz);
|
|
|
+
|
|
|
+ if (lfs_tag_type3(tag) == LFS_TYPE_CTZSTRUCT) {
|
|
|
+ info->size = ctz.size;
|
|
|
+ } else if (lfs_tag_type3(tag) == LFS_TYPE_INLINESTRUCT) {
|
|
|
+ info->size = lfs_tag_size(tag);
|
|
|
+ }
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+struct lfs_dir_find_match {
|
|
|
+ lfs_t *lfs;
|
|
|
+ const void *name;
|
|
|
+ lfs_size_t size;
|
|
|
+};
|
|
|
+
|
|
|
+static int lfs_dir_find_match(void *data,
|
|
|
+ lfs_tag_t tag, const void *buffer) {
|
|
|
+ struct lfs_dir_find_match *name = data;
|
|
|
+ lfs_t *lfs = name->lfs;
|
|
|
+ const struct lfs_diskoff *disk = buffer;
|
|
|
+
|
|
|
+ // compare with disk
|
|
|
+ lfs_size_t diff = lfs_min(name->size, lfs_tag_size(tag));
|
|
|
+ int res = lfs_bd_cmp(lfs,
|
|
|
+ NULL, &lfs->rcache, diff,
|
|
|
+ disk->block, disk->off, name->name, diff);
|
|
|
+ if (res != LFS_CMP_EQ) {
|
|
|
+ return res;
|
|
|
+ }
|
|
|
+
|
|
|
+ // only equal if our size is still the same
|
|
|
+ if (name->size != lfs_tag_size(tag)) {
|
|
|
+ return (name->size < lfs_tag_size(tag)) ? LFS_CMP_LT : LFS_CMP_GT;
|
|
|
+ }
|
|
|
+
|
|
|
+ // found a match!
|
|
|
+ return LFS_CMP_EQ;
|
|
|
+}
|
|
|
+
|
|
|
+static lfs_stag_t lfs_dir_find(lfs_t *lfs, lfs_mdir_t *dir,
|
|
|
+ const char **path, uint16_t *id) {
|
|
|
+ // we reduce path to a single name if we can find it
|
|
|
+ const char *name = *path;
|
|
|
+ if (id) {
|
|
|
+ *id = 0x3ff;
|
|
|
+ }
|
|
|
+
|
|
|
+ // default to root dir
|
|
|
+ lfs_stag_t tag = LFS_MKTAG(LFS_TYPE_DIR, 0x3ff, 0);
|
|
|
+ dir->tail[0] = lfs->root[0];
|
|
|
+ dir->tail[1] = lfs->root[1];
|
|
|
+
|
|
|
+ while (true) {
|
|
|
+nextname:
|
|
|
+ // skip slashes
|
|
|
+ name += strspn(name, "/");
|
|
|
+ lfs_size_t namelen = strcspn(name, "/");
|
|
|
+
|
|
|
+ // skip '.' and root '..'
|
|
|
+ if ((namelen == 1 && memcmp(name, ".", 1) == 0) ||
|
|
|
+ (namelen == 2 && memcmp(name, "..", 2) == 0)) {
|
|
|
+ name += namelen;
|
|
|
+ goto nextname;
|
|
|
+ }
|
|
|
+
|
|
|
+ // skip if matched by '..' in name
|
|
|
+ const char *suffix = name + namelen;
|
|
|
+ lfs_size_t sufflen;
|
|
|
+ int depth = 1;
|
|
|
+ while (true) {
|
|
|
+ suffix += strspn(suffix, "/");
|
|
|
+ sufflen = strcspn(suffix, "/");
|
|
|
+ if (sufflen == 0) {
|
|
|
+ break;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (sufflen == 2 && memcmp(suffix, "..", 2) == 0) {
|
|
|
+ depth -= 1;
|
|
|
+ if (depth == 0) {
|
|
|
+ name = suffix + sufflen;
|
|
|
+ goto nextname;
|
|
|
+ }
|
|
|
+ } else {
|
|
|
+ depth += 1;
|
|
|
+ }
|
|
|
+
|
|
|
+ suffix += sufflen;
|
|
|
+ }
|
|
|
+
|
|
|
+ // found path
|
|
|
+ if (name[0] == '\0') {
|
|
|
+ return tag;
|
|
|
+ }
|
|
|
+
|
|
|
+ // update what we've found so far
|
|
|
+ *path = name;
|
|
|
+
|
|
|
+ // only continue if we hit a directory
|
|
|
+ if (lfs_tag_type3(tag) != LFS_TYPE_DIR) {
|
|
|
+ return LFS_ERR_NOTDIR;
|
|
|
+ }
|
|
|
+
|
|
|
+ // grab the entry data
|
|
|
+ if (lfs_tag_id(tag) != 0x3ff) {
|
|
|
+ lfs_stag_t res = lfs_dir_get(lfs, dir, LFS_MKTAG(0x700, 0x3ff, 0),
|
|
|
+ LFS_MKTAG(LFS_TYPE_STRUCT, lfs_tag_id(tag), 8), dir->tail);
|
|
|
+ if (res < 0) {
|
|
|
+ return res;
|
|
|
+ }
|
|
|
+ lfs_pair_fromle32(dir->tail);
|
|
|
+ }
|
|
|
+
|
|
|
+ // find entry matching name
|
|
|
+ while (true) {
|
|
|
+ tag = lfs_dir_fetchmatch(lfs, dir, dir->tail,
|
|
|
+ LFS_MKTAG(0x780, 0, 0),
|
|
|
+ LFS_MKTAG(LFS_TYPE_NAME, 0, namelen),
|
|
|
+ // are we last name?
|
|
|
+ (strchr(name, '/') == NULL) ? id : NULL,
|
|
|
+ lfs_dir_find_match, &(struct lfs_dir_find_match){
|
|
|
+ lfs, name, namelen});
|
|
|
+ if (tag < 0) {
|
|
|
+ return tag;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (tag) {
|
|
|
+ break;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (!dir->split) {
|
|
|
+ return LFS_ERR_NOENT;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // to next name
|
|
|
+ name += namelen;
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+// commit logic
|
|
|
+struct lfs_commit {
|
|
|
+ lfs_block_t block;
|
|
|
+ lfs_off_t off;
|
|
|
+ lfs_tag_t ptag;
|
|
|
+ uint32_t crc;
|
|
|
+
|
|
|
+ lfs_off_t begin;
|
|
|
+ lfs_off_t end;
|
|
|
+};
|
|
|
+
|
|
|
+static int lfs_dir_commitprog(lfs_t *lfs, struct lfs_commit *commit,
|
|
|
+ const void *buffer, lfs_size_t size) {
|
|
|
+ int err = lfs_bd_prog(lfs,
|
|
|
+ &lfs->pcache, &lfs->rcache, false,
|
|
|
+ commit->block, commit->off ,
|
|
|
+ (const uint8_t*)buffer, size);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ commit->crc = lfs_crc(commit->crc, buffer, size);
|
|
|
+ commit->off += size;
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static int lfs_dir_commitattr(lfs_t *lfs, struct lfs_commit *commit,
|
|
|
+ lfs_tag_t tag, const void *buffer) {
|
|
|
+ // check if we fit
|
|
|
+ lfs_size_t dsize = lfs_tag_dsize(tag);
|
|
|
+ if (commit->off + dsize > commit->end) {
|
|
|
+ return LFS_ERR_NOSPC;
|
|
|
+ }
|
|
|
+
|
|
|
+ // write out tag
|
|
|
+ lfs_tag_t ntag = lfs_tobe32((tag & 0x7fffffff) ^ commit->ptag);
|
|
|
+ int err = lfs_dir_commitprog(lfs, commit, &ntag, sizeof(ntag));
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (!(tag & 0x80000000)) {
|
|
|
+ // from memory
|
|
|
+ err = lfs_dir_commitprog(lfs, commit, buffer, dsize-sizeof(tag));
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ } else {
|
|
|
+ // from disk
|
|
|
+ const struct lfs_diskoff *disk = buffer;
|
|
|
+ for (lfs_off_t i = 0; i < dsize-sizeof(tag); i++) {
|
|
|
+ // rely on caching to make this efficient
|
|
|
+ uint8_t dat;
|
|
|
+ err = lfs_bd_read(lfs,
|
|
|
+ NULL, &lfs->rcache, dsize-sizeof(tag)-i,
|
|
|
+ disk->block, disk->off+i, &dat, 1);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ err = lfs_dir_commitprog(lfs, commit, &dat, 1);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ commit->ptag = tag & 0x7fffffff;
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static int lfs_dir_commitcrc(lfs_t *lfs, struct lfs_commit *commit) {
|
|
|
+ // align to program units
|
|
|
+ const lfs_off_t off1 = commit->off + sizeof(lfs_tag_t);
|
|
|
+ const lfs_off_t end = lfs_alignup(off1 + sizeof(uint32_t),
|
|
|
+ lfs->cfg->prog_size);
|
|
|
+
|
|
|
+ // create crc tags to fill up remainder of commit, note that
|
|
|
+ // padding is not crcd, which lets fetches skip padding but
|
|
|
+ // makes committing a bit more complicated
|
|
|
+ while (commit->off < end) {
|
|
|
+ lfs_off_t off = commit->off + sizeof(lfs_tag_t);
|
|
|
+ lfs_off_t noff = lfs_min(end - off, 0x3fe) + off;
|
|
|
+ if (noff < end) {
|
|
|
+ noff = lfs_min(noff, end - 2*sizeof(uint32_t));
|
|
|
+ }
|
|
|
+
|
|
|
+ // read erased state from next program unit
|
|
|
+ lfs_tag_t tag = LFS_BLOCK_NULL;
|
|
|
+ int err = lfs_bd_read(lfs,
|
|
|
+ NULL, &lfs->rcache, sizeof(tag),
|
|
|
+ commit->block, noff, &tag, sizeof(tag));
|
|
|
+ if (err && err != LFS_ERR_CORRUPT) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ // build crc tag
|
|
|
+ bool reset = ~lfs_frombe32(tag) >> 31;
|
|
|
+ tag = LFS_MKTAG(LFS_TYPE_CRC + reset, 0x3ff, noff - off);
|
|
|
+
|
|
|
+ // write out crc
|
|
|
+ uint32_t footer[2];
|
|
|
+ footer[0] = lfs_tobe32(tag ^ commit->ptag);
|
|
|
+ commit->crc = lfs_crc(commit->crc, &footer[0], sizeof(footer[0]));
|
|
|
+ footer[1] = lfs_tole32(commit->crc);
|
|
|
+ err = lfs_bd_prog(lfs,
|
|
|
+ &lfs->pcache, &lfs->rcache, false,
|
|
|
+ commit->block, commit->off, &footer, sizeof(footer));
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ commit->off += sizeof(tag)+lfs_tag_size(tag);
|
|
|
+ commit->ptag = tag ^ ((lfs_tag_t)reset << 31);
|
|
|
+ commit->crc = LFS_BLOCK_NULL; // reset crc for next "commit"
|
|
|
+ }
|
|
|
+
|
|
|
+ // flush buffers
|
|
|
+ int err = lfs_bd_sync(lfs, &lfs->pcache, &lfs->rcache, false);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ // successful commit, check checksums to make sure
|
|
|
+ lfs_off_t off = commit->begin;
|
|
|
+ lfs_off_t noff = off1;
|
|
|
+ while (off < end) {
|
|
|
+ uint32_t crc = LFS_BLOCK_NULL;
|
|
|
+ for (lfs_off_t i = off; i < noff+sizeof(uint32_t); i++) {
|
|
|
+ // leave it up to caching to make this efficient
|
|
|
+ uint8_t dat;
|
|
|
+ err = lfs_bd_read(lfs,
|
|
|
+ NULL, &lfs->rcache, noff+sizeof(uint32_t)-i,
|
|
|
+ commit->block, i, &dat, 1);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ crc = lfs_crc(crc, &dat, 1);
|
|
|
+ }
|
|
|
+
|
|
|
+ // detected write error?
|
|
|
+ if (crc != 0) {
|
|
|
+ return LFS_ERR_CORRUPT;
|
|
|
+ }
|
|
|
+
|
|
|
+ // skip padding
|
|
|
+ off = lfs_min(end - noff, 0x3fe) + noff;
|
|
|
+ if (off < end) {
|
|
|
+ off = lfs_min(off, end - 2*sizeof(uint32_t));
|
|
|
+ }
|
|
|
+ noff = off + sizeof(uint32_t);
|
|
|
+ }
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static int lfs_dir_alloc(lfs_t *lfs, lfs_mdir_t *dir) {
|
|
|
+ // allocate pair of dir blocks (backwards, so we write block 1 first)
|
|
|
+ for (int i = 0; i < 2; i++) {
|
|
|
+ int err = lfs_alloc(lfs, &dir->pair[(i+1)%2]);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // rather than clobbering one of the blocks we just pretend
|
|
|
+ // the revision may be valid
|
|
|
+ int err = lfs_bd_read(lfs,
|
|
|
+ NULL, &lfs->rcache, sizeof(dir->rev),
|
|
|
+ dir->pair[0], 0, &dir->rev, sizeof(dir->rev));
|
|
|
+ dir->rev = lfs_fromle32(dir->rev);
|
|
|
+ if (err && err != LFS_ERR_CORRUPT) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ // make sure we don't immediately evict
|
|
|
+ dir->rev += dir->rev & 1;
|
|
|
+
|
|
|
+ // set defaults
|
|
|
+ dir->off = sizeof(dir->rev);
|
|
|
+ dir->etag = LFS_BLOCK_NULL;
|
|
|
+ dir->count = 0;
|
|
|
+ dir->tail[0] = LFS_BLOCK_NULL;
|
|
|
+ dir->tail[1] = LFS_BLOCK_NULL;
|
|
|
+ dir->erased = false;
|
|
|
+ dir->split = false;
|
|
|
+
|
|
|
+ // don't write out yet, let caller take care of that
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static int lfs_dir_drop(lfs_t *lfs, lfs_mdir_t *dir, lfs_mdir_t *tail) {
|
|
|
+ // steal state
|
|
|
+ int err = lfs_dir_getgstate(lfs, tail, &lfs->gdelta);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ // steal tail
|
|
|
+ lfs_pair_tole32(tail->tail);
|
|
|
+ err = lfs_dir_commit(lfs, dir, LFS_MKATTRS(
|
|
|
+ {LFS_MKTAG(LFS_TYPE_TAIL + tail->split, 0x3ff, 8), tail->tail}));
|
|
|
+ lfs_pair_fromle32(tail->tail);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static int lfs_dir_split(lfs_t *lfs,
|
|
|
+ lfs_mdir_t *dir, const struct lfs_mattr *attrs, int attrcount,
|
|
|
+ lfs_mdir_t *source, uint16_t split, uint16_t end) {
|
|
|
+ // create tail directory
|
|
|
+ lfs_alloc_ack(lfs);
|
|
|
+ lfs_mdir_t tail;
|
|
|
+ int err = lfs_dir_alloc(lfs, &tail);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ tail.split = dir->split;
|
|
|
+ tail.tail[0] = dir->tail[0];
|
|
|
+ tail.tail[1] = dir->tail[1];
|
|
|
+
|
|
|
+ err = lfs_dir_compact(lfs, &tail, attrs, attrcount, source, split, end);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ dir->tail[0] = tail.pair[0];
|
|
|
+ dir->tail[1] = tail.pair[1];
|
|
|
+ dir->split = true;
|
|
|
+
|
|
|
+ // update root if needed
|
|
|
+ if (lfs_pair_cmp(dir->pair, lfs->root) == 0 && split == 0) {
|
|
|
+ lfs->root[0] = tail.pair[0];
|
|
|
+ lfs->root[1] = tail.pair[1];
|
|
|
+ }
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static int lfs_dir_commit_size(void *p, lfs_tag_t tag, const void *buffer) {
|
|
|
+ lfs_size_t *size = p;
|
|
|
+ (void)buffer;
|
|
|
+
|
|
|
+ *size += lfs_tag_dsize(tag);
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+struct lfs_dir_commit_commit {
|
|
|
+ lfs_t *lfs;
|
|
|
+ struct lfs_commit *commit;
|
|
|
+};
|
|
|
+
|
|
|
+static int lfs_dir_commit_commit(void *p, lfs_tag_t tag, const void *buffer) {
|
|
|
+ struct lfs_dir_commit_commit *commit = p;
|
|
|
+ return lfs_dir_commitattr(commit->lfs, commit->commit, tag, buffer);
|
|
|
+}
|
|
|
+
|
|
|
+static int lfs_dir_compact(lfs_t *lfs,
|
|
|
+ lfs_mdir_t *dir, const struct lfs_mattr *attrs, int attrcount,
|
|
|
+ lfs_mdir_t *source, uint16_t begin, uint16_t end) {
|
|
|
+ // save some state in case block is bad
|
|
|
+ const lfs_block_t oldpair[2] = {dir->pair[1], dir->pair[0]};
|
|
|
+ bool relocated = false;
|
|
|
+ bool exhausted = false;
|
|
|
+
|
|
|
+ // should we split?
|
|
|
+ while (end - begin > 1) {
|
|
|
+ // find size
|
|
|
+ lfs_size_t size = 0;
|
|
|
+ int err = lfs_dir_traverse(lfs,
|
|
|
+ source, 0, LFS_BLOCK_NULL, attrs, attrcount, false,
|
|
|
+ LFS_MKTAG(0x400, 0x3ff, 0),
|
|
|
+ LFS_MKTAG(LFS_TYPE_NAME, 0, 0),
|
|
|
+ begin, end, -begin,
|
|
|
+ lfs_dir_commit_size, &size);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ // space is complicated, we need room for tail, crc, gstate,
|
|
|
+ // cleanup delete, and we cap at half a block to give room
|
|
|
+ // for metadata updates.
|
|
|
+ if (end - begin < 0xff &&
|
|
|
+ size <= lfs_min(lfs->cfg->block_size - 36,
|
|
|
+ lfs_alignup(lfs->cfg->block_size/2,
|
|
|
+ lfs->cfg->prog_size))) {
|
|
|
+ break;
|
|
|
+ }
|
|
|
+
|
|
|
+ // can't fit, need to split, we should really be finding the
|
|
|
+ // largest size that fits with a small binary search, but right now
|
|
|
+ // it's not worth the code size
|
|
|
+ uint16_t split = (end - begin) / 2;
|
|
|
+ err = lfs_dir_split(lfs, dir, attrs, attrcount,
|
|
|
+ source, begin+split, end);
|
|
|
+ if (err) {
|
|
|
+ // if we fail to split, we may be able to overcompact, unless
|
|
|
+ // we're too big for even the full block, in which case our
|
|
|
+ // only option is to error
|
|
|
+ if (err == LFS_ERR_NOSPC && size <= lfs->cfg->block_size - 36) {
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ end = begin + split;
|
|
|
+ }
|
|
|
+
|
|
|
+ // increment revision count
|
|
|
+ dir->rev += 1;
|
|
|
+ if (lfs->cfg->block_cycles > 0 &&
|
|
|
+ (dir->rev % (lfs->cfg->block_cycles+1) == 0)) {
|
|
|
+ if (lfs_pair_cmp(dir->pair, (const lfs_block_t[2]){0, 1}) == 0) {
|
|
|
+ // oh no! we're writing too much to the superblock,
|
|
|
+ // should we expand?
|
|
|
+ lfs_ssize_t res = lfs_fs_size(lfs);
|
|
|
+ if (res < 0) {
|
|
|
+ return res;
|
|
|
+ }
|
|
|
+
|
|
|
+ // do we have extra space? littlefs can't reclaim this space
|
|
|
+ // by itself, so expand cautiously
|
|
|
+ if ((lfs_size_t)res < lfs->cfg->block_count/2) {
|
|
|
+ LFS_DEBUG("Expanding superblock at rev %"PRIu32, dir->rev);
|
|
|
+ int err = lfs_dir_split(lfs, dir, attrs, attrcount,
|
|
|
+ source, begin, end);
|
|
|
+ if (err && err != LFS_ERR_NOSPC) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ // welp, we tried, if we ran out of space there's not much
|
|
|
+ // we can do, we'll error later if we've become frozen
|
|
|
+ if (!err) {
|
|
|
+ end = begin;
|
|
|
+ }
|
|
|
+ }
|
|
|
+#ifdef LFS_MIGRATE
|
|
|
+ } else if (lfs->lfs1) {
|
|
|
+ // do not proactively relocate blocks during migrations, this
|
|
|
+ // can cause a number of failure states such: clobbering the
|
|
|
+ // v1 superblock if we relocate root, and invalidating directory
|
|
|
+ // pointers if we relocate the head of a directory. On top of
|
|
|
+ // this, relocations increase the overall complexity of
|
|
|
+ // lfs_migration, which is already a delicate operation.
|
|
|
+#endif
|
|
|
+ } else {
|
|
|
+ // we're writing too much, time to relocate
|
|
|
+ exhausted = true;
|
|
|
+ goto relocate;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // begin loop to commit compaction to blocks until a compact sticks
|
|
|
+ while (true) {
|
|
|
+ {
|
|
|
+ // There's nothing special about our global delta, so feed it into
|
|
|
+ // our local global delta
|
|
|
+ int err = lfs_dir_getgstate(lfs, dir, &lfs->gdelta);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ // setup commit state
|
|
|
+ struct lfs_commit commit = {
|
|
|
+ .block = dir->pair[1],
|
|
|
+ .off = 0,
|
|
|
+ .ptag = LFS_BLOCK_NULL,
|
|
|
+ .crc = LFS_BLOCK_NULL,
|
|
|
+
|
|
|
+ .begin = 0,
|
|
|
+ .end = lfs->cfg->block_size - 8,
|
|
|
+ };
|
|
|
+
|
|
|
+ // erase block to write to
|
|
|
+ err = lfs_bd_erase(lfs, dir->pair[1]);
|
|
|
+ if (err) {
|
|
|
+ if (err == LFS_ERR_CORRUPT) {
|
|
|
+ goto relocate;
|
|
|
+ }
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ // write out header
|
|
|
+ dir->rev = lfs_tole32(dir->rev);
|
|
|
+ err = lfs_dir_commitprog(lfs, &commit,
|
|
|
+ &dir->rev, sizeof(dir->rev));
|
|
|
+ dir->rev = lfs_fromle32(dir->rev);
|
|
|
+ if (err) {
|
|
|
+ if (err == LFS_ERR_CORRUPT) {
|
|
|
+ goto relocate;
|
|
|
+ }
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ // traverse the directory, this time writing out all unique tags
|
|
|
+ err = lfs_dir_traverse(lfs,
|
|
|
+ source, 0, LFS_BLOCK_NULL, attrs, attrcount, false,
|
|
|
+ LFS_MKTAG(0x400, 0x3ff, 0),
|
|
|
+ LFS_MKTAG(LFS_TYPE_NAME, 0, 0),
|
|
|
+ begin, end, -begin,
|
|
|
+ lfs_dir_commit_commit, &(struct lfs_dir_commit_commit){
|
|
|
+ lfs, &commit});
|
|
|
+ if (err) {
|
|
|
+ if (err == LFS_ERR_CORRUPT) {
|
|
|
+ goto relocate;
|
|
|
+ }
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ // commit tail, which may be new after last size check
|
|
|
+ if (!lfs_pair_isnull(dir->tail)) {
|
|
|
+ lfs_pair_tole32(dir->tail);
|
|
|
+ err = lfs_dir_commitattr(lfs, &commit,
|
|
|
+ LFS_MKTAG(LFS_TYPE_TAIL + dir->split, 0x3ff, 8),
|
|
|
+ dir->tail);
|
|
|
+ lfs_pair_fromle32(dir->tail);
|
|
|
+ if (err) {
|
|
|
+ if (err == LFS_ERR_CORRUPT) {
|
|
|
+ goto relocate;
|
|
|
+ }
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ if (!relocated && !lfs_gstate_iszero(&lfs->gdelta)) {
|
|
|
+ // commit any globals, unless we're relocating,
|
|
|
+ // in which case our parent will steal our globals
|
|
|
+ lfs_gstate_tole32(&lfs->gdelta);
|
|
|
+ err = lfs_dir_commitattr(lfs, &commit,
|
|
|
+ LFS_MKTAG(LFS_TYPE_MOVESTATE, 0x3ff,
|
|
|
+ sizeof(lfs->gdelta)), &lfs->gdelta);
|
|
|
+ lfs_gstate_fromle32(&lfs->gdelta);
|
|
|
+ if (err) {
|
|
|
+ if (err == LFS_ERR_CORRUPT) {
|
|
|
+ goto relocate;
|
|
|
+ }
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ err = lfs_dir_commitcrc(lfs, &commit);
|
|
|
+ if (err) {
|
|
|
+ if (err == LFS_ERR_CORRUPT) {
|
|
|
+ goto relocate;
|
|
|
+ }
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ // successful compaction, swap dir pair to indicate most recent
|
|
|
+ LFS_ASSERT(commit.off % lfs->cfg->prog_size == 0);
|
|
|
+ lfs_pair_swap(dir->pair);
|
|
|
+ dir->count = end - begin;
|
|
|
+ dir->off = commit.off;
|
|
|
+ dir->etag = commit.ptag;
|
|
|
+ // note we able to have already handled move here
|
|
|
+ if (lfs_gstate_hasmovehere(&lfs->gpending, dir->pair)) {
|
|
|
+ lfs_gstate_xormove(&lfs->gpending,
|
|
|
+ &lfs->gpending, 0x3ff, NULL);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ break;
|
|
|
+
|
|
|
+relocate:
|
|
|
+ // commit was corrupted, drop caches and prepare to relocate block
|
|
|
+ relocated = true;
|
|
|
+ lfs_cache_drop(lfs, &lfs->pcache);
|
|
|
+ if (!exhausted) {
|
|
|
+ LFS_DEBUG("Bad block at %"PRIx32, dir->pair[1]);
|
|
|
+ }
|
|
|
+
|
|
|
+ // can't relocate superblock, filesystem is now frozen
|
|
|
+ if (lfs_pair_cmp(oldpair, (const lfs_block_t[2]){0, 1}) == 0) {
|
|
|
+ LFS_WARN("Superblock %"PRIx32" has become unwritable", oldpair[1]);
|
|
|
+ return LFS_ERR_NOSPC;
|
|
|
+ }
|
|
|
+
|
|
|
+ // relocate half of pair
|
|
|
+ int err = lfs_alloc(lfs, &dir->pair[1]);
|
|
|
+ if (err && (err != LFS_ERR_NOSPC && !exhausted)) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ continue;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (!relocated) {
|
|
|
+ lfs->gstate = lfs->gpending;
|
|
|
+ lfs->gdelta = (struct lfs_gstate){0};
|
|
|
+ } else {
|
|
|
+ // update references if we relocated
|
|
|
+ LFS_DEBUG("Relocating %"PRIx32" %"PRIx32" -> %"PRIx32" %"PRIx32,
|
|
|
+ oldpair[0], oldpair[1], dir->pair[0], dir->pair[1]);
|
|
|
+ int err = lfs_fs_relocate(lfs, oldpair, dir->pair);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static int lfs_dir_commit(lfs_t *lfs, lfs_mdir_t *dir,
|
|
|
+ const struct lfs_mattr *attrs, int attrcount) {
|
|
|
+ // check for any inline files that aren't RAM backed and
|
|
|
+ // forcefully evict them, needed for filesystem consistency
|
|
|
+ for (lfs_file_t *f = (lfs_file_t*)lfs->mlist; f; f = f->next) {
|
|
|
+ if (dir != &f->m && lfs_pair_cmp(f->m.pair, dir->pair) == 0 &&
|
|
|
+ f->type == LFS_TYPE_REG && (f->flags & LFS_F_INLINE) &&
|
|
|
+ f->ctz.size > lfs->cfg->cache_size) {
|
|
|
+ int err = lfs_file_outline(lfs, f);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ err = lfs_file_flush(lfs, f);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // calculate changes to the directory
|
|
|
+ lfs_tag_t deletetag = LFS_BLOCK_NULL;
|
|
|
+ lfs_tag_t createtag = LFS_BLOCK_NULL;
|
|
|
+ for (int i = 0; i < attrcount; i++) {
|
|
|
+ if (lfs_tag_type3(attrs[i].tag) == LFS_TYPE_CREATE) {
|
|
|
+ createtag = attrs[i].tag;
|
|
|
+ dir->count += 1;
|
|
|
+ } else if (lfs_tag_type3(attrs[i].tag) == LFS_TYPE_DELETE) {
|
|
|
+ deletetag = attrs[i].tag;
|
|
|
+ LFS_ASSERT(dir->count > 0);
|
|
|
+ dir->count -= 1;
|
|
|
+ } else if (lfs_tag_type1(attrs[i].tag) == LFS_TYPE_TAIL) {
|
|
|
+ dir->tail[0] = ((lfs_block_t*)attrs[i].buffer)[0];
|
|
|
+ dir->tail[1] = ((lfs_block_t*)attrs[i].buffer)[1];
|
|
|
+ dir->split = (lfs_tag_chunk(attrs[i].tag) & 1);
|
|
|
+ lfs_pair_fromle32(dir->tail);
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // do we have a pending move?
|
|
|
+ if (lfs_gstate_hasmovehere(&lfs->gpending, dir->pair)) {
|
|
|
+ deletetag = lfs->gpending.tag & LFS_MKTAG(0x7ff, 0x3ff, 0);
|
|
|
+ LFS_ASSERT(dir->count > 0);
|
|
|
+ dir->count -= 1;
|
|
|
+
|
|
|
+ // mark gdelta so we reflect the move we will fix
|
|
|
+ lfs_gstate_xormove(&lfs->gdelta, &lfs->gpending, 0x3ff, NULL);
|
|
|
+ }
|
|
|
+
|
|
|
+ // should we actually drop the directory block?
|
|
|
+ if (lfs_tag_isvalid(deletetag) && dir->count == 0) {
|
|
|
+ lfs_mdir_t pdir;
|
|
|
+ int err = lfs_fs_pred(lfs, dir->pair, &pdir);
|
|
|
+ if (err && err != LFS_ERR_NOENT) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (err != LFS_ERR_NOENT && pdir.split) {
|
|
|
+ return lfs_dir_drop(lfs, &pdir, dir);
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ if (dir->erased || dir->count >= 0xff) {
|
|
|
+ // try to commit
|
|
|
+ struct lfs_commit commit = {
|
|
|
+ .block = dir->pair[0],
|
|
|
+ .off = dir->off,
|
|
|
+ .ptag = dir->etag,
|
|
|
+ .crc = LFS_BLOCK_NULL,
|
|
|
+
|
|
|
+ .begin = dir->off,
|
|
|
+ .end = lfs->cfg->block_size - 8,
|
|
|
+ };
|
|
|
+
|
|
|
+ // traverse attrs that need to be written out
|
|
|
+ lfs_pair_tole32(dir->tail);
|
|
|
+ int err = lfs_dir_traverse(lfs,
|
|
|
+ dir, dir->off, dir->etag, attrs, attrcount, false,
|
|
|
+ 0, 0, 0, 0, 0,
|
|
|
+ lfs_dir_commit_commit, &(struct lfs_dir_commit_commit){
|
|
|
+ lfs, &commit});
|
|
|
+ lfs_pair_fromle32(dir->tail);
|
|
|
+ if (err) {
|
|
|
+ if (err == LFS_ERR_NOSPC || err == LFS_ERR_CORRUPT) {
|
|
|
+ goto compact;
|
|
|
+ }
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ // commit any global diffs if we have any
|
|
|
+ if (!lfs_gstate_iszero(&lfs->gdelta)) {
|
|
|
+ err = lfs_dir_getgstate(lfs, dir, &lfs->gdelta);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ lfs_gstate_tole32(&lfs->gdelta);
|
|
|
+ err = lfs_dir_commitattr(lfs, &commit,
|
|
|
+ LFS_MKTAG(LFS_TYPE_MOVESTATE, 0x3ff,
|
|
|
+ sizeof(lfs->gdelta)), &lfs->gdelta);
|
|
|
+ lfs_gstate_fromle32(&lfs->gdelta);
|
|
|
+ if (err) {
|
|
|
+ if (err == LFS_ERR_NOSPC || err == LFS_ERR_CORRUPT) {
|
|
|
+ goto compact;
|
|
|
+ }
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // finalize commit with the crc
|
|
|
+ err = lfs_dir_commitcrc(lfs, &commit);
|
|
|
+ if (err) {
|
|
|
+ if (err == LFS_ERR_NOSPC || err == LFS_ERR_CORRUPT) {
|
|
|
+ goto compact;
|
|
|
+ }
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ // successful commit, update dir
|
|
|
+ LFS_ASSERT(commit.off % lfs->cfg->prog_size == 0);
|
|
|
+ dir->off = commit.off;
|
|
|
+ dir->etag = commit.ptag;
|
|
|
+
|
|
|
+ // note we able to have already handled move here
|
|
|
+ if (lfs_gstate_hasmovehere(&lfs->gpending, dir->pair)) {
|
|
|
+ lfs_gstate_xormove(&lfs->gpending, &lfs->gpending, 0x3ff, NULL);
|
|
|
+ }
|
|
|
+
|
|
|
+ // update gstate
|
|
|
+ lfs->gstate = lfs->gpending;
|
|
|
+ lfs->gdelta = (struct lfs_gstate){0};
|
|
|
+ } else {
|
|
|
+compact:
|
|
|
+ // fall back to compaction
|
|
|
+ lfs_cache_drop(lfs, &lfs->pcache);
|
|
|
+
|
|
|
+ int err = lfs_dir_compact(lfs, dir, attrs, attrcount,
|
|
|
+ dir, 0, dir->count);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // update any directories that are affected
|
|
|
+ lfs_mdir_t copy = *dir;
|
|
|
+
|
|
|
+ // two passes, once for things that aren't us, and one
|
|
|
+ // for things that are
|
|
|
+ for (struct lfs_mlist *d = lfs->mlist; d; d = d->next) {
|
|
|
+ if (lfs_pair_cmp(d->m.pair, copy.pair) == 0) {
|
|
|
+ d->m = *dir;
|
|
|
+ if (d->id == lfs_tag_id(deletetag)) {
|
|
|
+ d->m.pair[0] = LFS_BLOCK_NULL;
|
|
|
+ d->m.pair[1] = LFS_BLOCK_NULL;
|
|
|
+ } else if (d->id > lfs_tag_id(deletetag)) {
|
|
|
+ d->id -= 1;
|
|
|
+ if (d->type == LFS_TYPE_DIR) {
|
|
|
+ ((lfs_dir_t*)d)->pos -= 1;
|
|
|
+ }
|
|
|
+ } else if (&d->m != dir && d->id >= lfs_tag_id(createtag)) {
|
|
|
+ d->id += 1;
|
|
|
+ if (d->type == LFS_TYPE_DIR) {
|
|
|
+ ((lfs_dir_t*)d)->pos += 1;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ while (d->id >= d->m.count && d->m.split) {
|
|
|
+ // we split and id is on tail now
|
|
|
+ d->id -= d->m.count;
|
|
|
+ int err = lfs_dir_fetch(lfs, &d->m, d->m.tail);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+/// Top level directory operations ///
|
|
|
+int lfs_mkdir(lfs_t *lfs, const char *path) {
|
|
|
+ LFS_TRACE("lfs_mkdir(%p, \"%s\")", (void*)lfs, path);
|
|
|
+ // deorphan if we haven't yet, needed at most once after poweron
|
|
|
+ int err = lfs_fs_forceconsistency(lfs);
|
|
|
+ if (err) {
|
|
|
+ LFS_TRACE("lfs_mkdir -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ lfs_mdir_t cwd;
|
|
|
+ uint16_t id;
|
|
|
+ err = lfs_dir_find(lfs, &cwd, &path, &id);
|
|
|
+ if (!(err == LFS_ERR_NOENT && id != 0x3ff)) {
|
|
|
+ LFS_TRACE("lfs_mkdir -> %d", (err < 0) ? err : LFS_ERR_EXIST);
|
|
|
+ return (err < 0) ? err : LFS_ERR_EXIST;
|
|
|
+ }
|
|
|
+
|
|
|
+ // check that name fits
|
|
|
+ lfs_size_t nlen = strlen(path);
|
|
|
+ if (nlen > lfs->name_max) {
|
|
|
+ LFS_TRACE("lfs_mkdir -> %d", LFS_ERR_NAMETOOLONG);
|
|
|
+ return LFS_ERR_NAMETOOLONG;
|
|
|
+ }
|
|
|
+
|
|
|
+ // build up new directory
|
|
|
+ lfs_alloc_ack(lfs);
|
|
|
+ lfs_mdir_t dir;
|
|
|
+ err = lfs_dir_alloc(lfs, &dir);
|
|
|
+ if (err) {
|
|
|
+ LFS_TRACE("lfs_mkdir -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ // find end of list
|
|
|
+ lfs_mdir_t pred = cwd;
|
|
|
+ while (pred.split) {
|
|
|
+ err = lfs_dir_fetch(lfs, &pred, pred.tail);
|
|
|
+ if (err) {
|
|
|
+ LFS_TRACE("lfs_mkdir -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // setup dir
|
|
|
+ lfs_pair_tole32(pred.tail);
|
|
|
+ err = lfs_dir_commit(lfs, &dir, LFS_MKATTRS(
|
|
|
+ {LFS_MKTAG(LFS_TYPE_SOFTTAIL, 0x3ff, 8), pred.tail}));
|
|
|
+ lfs_pair_fromle32(pred.tail);
|
|
|
+ if (err) {
|
|
|
+ LFS_TRACE("lfs_mkdir -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ // current block end of list?
|
|
|
+ if (cwd.split) {
|
|
|
+ // update tails, this creates a desync
|
|
|
+ lfs_fs_preporphans(lfs, +1);
|
|
|
+ lfs_pair_tole32(dir.pair);
|
|
|
+ err = lfs_dir_commit(lfs, &pred, LFS_MKATTRS(
|
|
|
+ {LFS_MKTAG(LFS_TYPE_SOFTTAIL, 0x3ff, 8), dir.pair}));
|
|
|
+ lfs_pair_fromle32(dir.pair);
|
|
|
+ if (err) {
|
|
|
+ LFS_TRACE("lfs_mkdir -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ lfs_fs_preporphans(lfs, -1);
|
|
|
+ }
|
|
|
+
|
|
|
+ // now insert into our parent block
|
|
|
+ lfs_pair_tole32(dir.pair);
|
|
|
+ err = lfs_dir_commit(lfs, &cwd, LFS_MKATTRS(
|
|
|
+ {LFS_MKTAG(LFS_TYPE_CREATE, id, 0), NULL},
|
|
|
+ {LFS_MKTAG(LFS_TYPE_DIR, id, nlen), path},
|
|
|
+ {LFS_MKTAG(LFS_TYPE_DIRSTRUCT, id, 8), dir.pair},
|
|
|
+ {!cwd.split
|
|
|
+ ? LFS_MKTAG(LFS_TYPE_SOFTTAIL, 0x3ff, 8)
|
|
|
+ : LFS_MKTAG(LFS_FROM_NOOP, 0, 0), dir.pair}));
|
|
|
+ lfs_pair_fromle32(dir.pair);
|
|
|
+ if (err) {
|
|
|
+ LFS_TRACE("lfs_mkdir -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ LFS_TRACE("lfs_mkdir -> %d", 0);
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+int lfs_dir_open(lfs_t *lfs, lfs_dir_t *dir, const char *path) {
|
|
|
+ LFS_TRACE("lfs_dir_open(%p, %p, \"%s\")", (void*)lfs, (void*)dir, path);
|
|
|
+ lfs_stag_t tag = lfs_dir_find(lfs, &dir->m, &path, NULL);
|
|
|
+ if (tag < 0) {
|
|
|
+ LFS_TRACE("lfs_dir_open -> %"PRId32, tag);
|
|
|
+ return tag;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (lfs_tag_type3(tag) != LFS_TYPE_DIR) {
|
|
|
+ LFS_TRACE("lfs_dir_open -> %d", LFS_ERR_NOTDIR);
|
|
|
+ return LFS_ERR_NOTDIR;
|
|
|
+ }
|
|
|
+
|
|
|
+ lfs_block_t pair[2];
|
|
|
+ if (lfs_tag_id(tag) == 0x3ff) {
|
|
|
+ // handle root dir separately
|
|
|
+ pair[0] = lfs->root[0];
|
|
|
+ pair[1] = lfs->root[1];
|
|
|
+ } else {
|
|
|
+ // get dir pair from parent
|
|
|
+ lfs_stag_t res = lfs_dir_get(lfs, &dir->m, LFS_MKTAG(0x700, 0x3ff, 0),
|
|
|
+ LFS_MKTAG(LFS_TYPE_STRUCT, lfs_tag_id(tag), 8), pair);
|
|
|
+ if (res < 0) {
|
|
|
+ LFS_TRACE("lfs_dir_open -> %"PRId32, res);
|
|
|
+ return res;
|
|
|
+ }
|
|
|
+ lfs_pair_fromle32(pair);
|
|
|
+ }
|
|
|
+
|
|
|
+ // fetch first pair
|
|
|
+ int err = lfs_dir_fetch(lfs, &dir->m, pair);
|
|
|
+ if (err) {
|
|
|
+ LFS_TRACE("lfs_dir_open -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ // setup entry
|
|
|
+ dir->head[0] = dir->m.pair[0];
|
|
|
+ dir->head[1] = dir->m.pair[1];
|
|
|
+ dir->id = 0;
|
|
|
+ dir->pos = 0;
|
|
|
+
|
|
|
+ // add to list of mdirs
|
|
|
+ dir->type = LFS_TYPE_DIR;
|
|
|
+ dir->next = (lfs_dir_t*)lfs->mlist;
|
|
|
+ lfs->mlist = (struct lfs_mlist*)dir;
|
|
|
+
|
|
|
+ LFS_TRACE("lfs_dir_open -> %d", 0);
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+int lfs_dir_close(lfs_t *lfs, lfs_dir_t *dir) {
|
|
|
+ LFS_TRACE("lfs_dir_close(%p, %p)", (void*)lfs, (void*)dir);
|
|
|
+ // remove from list of mdirs
|
|
|
+ for (struct lfs_mlist **p = &lfs->mlist; *p; p = &(*p)->next) {
|
|
|
+ if (*p == (struct lfs_mlist*)dir) {
|
|
|
+ *p = (*p)->next;
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ LFS_TRACE("lfs_dir_close -> %d", 0);
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+int lfs_dir_read(lfs_t *lfs, lfs_dir_t *dir, struct lfs_info *info) {
|
|
|
+ LFS_TRACE("lfs_dir_read(%p, %p, %p)",
|
|
|
+ (void*)lfs, (void*)dir, (void*)info);
|
|
|
+ memset(info, 0, sizeof(*info));
|
|
|
+
|
|
|
+ // special offset for '.' and '..'
|
|
|
+ if (dir->pos == 0) {
|
|
|
+ info->type = LFS_TYPE_DIR;
|
|
|
+ strcpy(info->name, ".");
|
|
|
+ dir->pos += 1;
|
|
|
+ LFS_TRACE("lfs_dir_read -> %d", true);
|
|
|
+ return true;
|
|
|
+ } else if (dir->pos == 1) {
|
|
|
+ info->type = LFS_TYPE_DIR;
|
|
|
+ strcpy(info->name, "..");
|
|
|
+ dir->pos += 1;
|
|
|
+ LFS_TRACE("lfs_dir_read -> %d", true);
|
|
|
+ return true;
|
|
|
+ }
|
|
|
+
|
|
|
+ while (true) {
|
|
|
+ if (dir->id == dir->m.count) {
|
|
|
+ if (!dir->m.split) {
|
|
|
+ LFS_TRACE("lfs_dir_read -> %d", false);
|
|
|
+ return false;
|
|
|
+ }
|
|
|
+
|
|
|
+ int err = lfs_dir_fetch(lfs, &dir->m, dir->m.tail);
|
|
|
+ if (err) {
|
|
|
+ LFS_TRACE("lfs_dir_read -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ dir->id = 0;
|
|
|
+ }
|
|
|
+
|
|
|
+ int err = lfs_dir_getinfo(lfs, &dir->m, dir->id, info);
|
|
|
+ if (err && err != LFS_ERR_NOENT) {
|
|
|
+ LFS_TRACE("lfs_dir_read -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ dir->id += 1;
|
|
|
+ if (err != LFS_ERR_NOENT) {
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ dir->pos += 1;
|
|
|
+ LFS_TRACE("lfs_dir_read -> %d", true);
|
|
|
+ return true;
|
|
|
+}
|
|
|
+
|
|
|
+int lfs_dir_seek(lfs_t *lfs, lfs_dir_t *dir, lfs_off_t off) {
|
|
|
+ LFS_TRACE("lfs_dir_seek(%p, %p, %"PRIu32")",
|
|
|
+ (void*)lfs, (void*)dir, off);
|
|
|
+ // simply walk from head dir
|
|
|
+ int err = lfs_dir_rewind(lfs, dir);
|
|
|
+ if (err) {
|
|
|
+ LFS_TRACE("lfs_dir_seek -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ // first two for ./..
|
|
|
+ dir->pos = lfs_min(2, off);
|
|
|
+ off -= dir->pos;
|
|
|
+
|
|
|
+ // skip superblock entry
|
|
|
+ dir->id = (off > 0 && lfs_pair_cmp(dir->head, lfs->root) == 0);
|
|
|
+
|
|
|
+ while (off > 0) {
|
|
|
+ int diff = lfs_min(dir->m.count - dir->id, off);
|
|
|
+ dir->id += diff;
|
|
|
+ dir->pos += diff;
|
|
|
+ off -= diff;
|
|
|
+
|
|
|
+ if (dir->id == dir->m.count) {
|
|
|
+ if (!dir->m.split) {
|
|
|
+ LFS_TRACE("lfs_dir_seek -> %d", LFS_ERR_INVAL);
|
|
|
+ return LFS_ERR_INVAL;
|
|
|
+ }
|
|
|
+
|
|
|
+ err = lfs_dir_fetch(lfs, &dir->m, dir->m.tail);
|
|
|
+ if (err) {
|
|
|
+ LFS_TRACE("lfs_dir_seek -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ dir->id = 0;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ LFS_TRACE("lfs_dir_seek -> %d", 0);
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+lfs_soff_t lfs_dir_tell(lfs_t *lfs, lfs_dir_t *dir) {
|
|
|
+ LFS_TRACE("lfs_dir_tell(%p, %p)", (void*)lfs, (void*)dir);
|
|
|
+ (void)lfs;
|
|
|
+ LFS_TRACE("lfs_dir_tell -> %"PRId32, dir->pos);
|
|
|
+ return dir->pos;
|
|
|
+}
|
|
|
+
|
|
|
+int lfs_dir_rewind(lfs_t *lfs, lfs_dir_t *dir) {
|
|
|
+ LFS_TRACE("lfs_dir_rewind(%p, %p)", (void*)lfs, (void*)dir);
|
|
|
+ // reload the head dir
|
|
|
+ int err = lfs_dir_fetch(lfs, &dir->m, dir->head);
|
|
|
+ if (err) {
|
|
|
+ LFS_TRACE("lfs_dir_rewind -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ dir->id = 0;
|
|
|
+ dir->pos = 0;
|
|
|
+ LFS_TRACE("lfs_dir_rewind -> %d", 0);
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+/// File index list operations ///
|
|
|
+static int lfs_ctz_index(lfs_t *lfs, lfs_off_t *off) {
|
|
|
+ lfs_off_t size = *off;
|
|
|
+ lfs_off_t b = lfs->cfg->block_size - 2*4;
|
|
|
+ lfs_off_t i = size / b;
|
|
|
+ if (i == 0) {
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+
|
|
|
+ i = (size - 4*(lfs_popc(i-1)+2)) / b;
|
|
|
+ *off = size - b*i - 4*lfs_popc(i);
|
|
|
+ return i;
|
|
|
+}
|
|
|
+
|
|
|
+static int lfs_ctz_find(lfs_t *lfs,
|
|
|
+ const lfs_cache_t *pcache, lfs_cache_t *rcache,
|
|
|
+ lfs_block_t head, lfs_size_t size,
|
|
|
+ lfs_size_t pos, lfs_block_t *block, lfs_off_t *off) {
|
|
|
+ if (size == 0) {
|
|
|
+ *block = LFS_BLOCK_NULL;
|
|
|
+ *off = 0;
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+
|
|
|
+ lfs_off_t current = lfs_ctz_index(lfs, &(lfs_off_t){size-1});
|
|
|
+ lfs_off_t target = lfs_ctz_index(lfs, &pos);
|
|
|
+
|
|
|
+ while (current > target) {
|
|
|
+ lfs_size_t skip = lfs_min(
|
|
|
+ lfs_npw2(current-target+1) - 1,
|
|
|
+ lfs_ctz(current));
|
|
|
+
|
|
|
+ int err = lfs_bd_read(lfs,
|
|
|
+ pcache, rcache, sizeof(head),
|
|
|
+ head, 4*skip, &head, sizeof(head));
|
|
|
+ head = lfs_fromle32(head);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ LFS_ASSERT(head >= 2 && head <= lfs->cfg->block_count);
|
|
|
+ current -= 1 << skip;
|
|
|
+ }
|
|
|
+
|
|
|
+ *block = head;
|
|
|
+ *off = pos;
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static int lfs_ctz_extend(lfs_t *lfs,
|
|
|
+ lfs_cache_t *pcache, lfs_cache_t *rcache,
|
|
|
+ lfs_block_t head, lfs_size_t size,
|
|
|
+ lfs_block_t *block, lfs_off_t *off) {
|
|
|
+ while (true) {
|
|
|
+ // go ahead and grab a block
|
|
|
+ lfs_block_t nblock;
|
|
|
+ int err = lfs_alloc(lfs, &nblock);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ LFS_ASSERT(nblock >= 2 && nblock <= lfs->cfg->block_count);
|
|
|
+
|
|
|
+ {
|
|
|
+ err = lfs_bd_erase(lfs, nblock);
|
|
|
+ if (err) {
|
|
|
+ if (err == LFS_ERR_CORRUPT) {
|
|
|
+ goto relocate;
|
|
|
+ }
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (size == 0) {
|
|
|
+ *block = nblock;
|
|
|
+ *off = 0;
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+
|
|
|
+ size -= 1;
|
|
|
+ lfs_off_t index = lfs_ctz_index(lfs, &size);
|
|
|
+ size += 1;
|
|
|
+
|
|
|
+ // just copy out the last block if it is incomplete
|
|
|
+ if (size != lfs->cfg->block_size) {
|
|
|
+ for (lfs_off_t i = 0; i < size; i++) {
|
|
|
+ uint8_t data;
|
|
|
+ err = lfs_bd_read(lfs,
|
|
|
+ NULL, rcache, size-i,
|
|
|
+ head, i, &data, 1);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ err = lfs_bd_prog(lfs,
|
|
|
+ pcache, rcache, true,
|
|
|
+ nblock, i, &data, 1);
|
|
|
+ if (err) {
|
|
|
+ if (err == LFS_ERR_CORRUPT) {
|
|
|
+ goto relocate;
|
|
|
+ }
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ *block = nblock;
|
|
|
+ *off = size;
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+
|
|
|
+ // append block
|
|
|
+ index += 1;
|
|
|
+ lfs_size_t skips = lfs_ctz(index) + 1;
|
|
|
+
|
|
|
+ for (lfs_off_t i = 0; i < skips; i++) {
|
|
|
+ head = lfs_tole32(head);
|
|
|
+ err = lfs_bd_prog(lfs, pcache, rcache, true,
|
|
|
+ nblock, 4*i, &head, 4);
|
|
|
+ head = lfs_fromle32(head);
|
|
|
+ if (err) {
|
|
|
+ if (err == LFS_ERR_CORRUPT) {
|
|
|
+ goto relocate;
|
|
|
+ }
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (i != skips-1) {
|
|
|
+ err = lfs_bd_read(lfs,
|
|
|
+ NULL, rcache, sizeof(head),
|
|
|
+ head, 4*i, &head, sizeof(head));
|
|
|
+ head = lfs_fromle32(head);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ LFS_ASSERT(head >= 2 && head <= lfs->cfg->block_count);
|
|
|
+ }
|
|
|
+
|
|
|
+ *block = nblock;
|
|
|
+ *off = 4*skips;
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+
|
|
|
+relocate:
|
|
|
+ LFS_DEBUG("Bad block at %"PRIx32, nblock);
|
|
|
+
|
|
|
+ // just clear cache and try a new block
|
|
|
+ lfs_cache_drop(lfs, pcache);
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+static int lfs_ctz_traverse(lfs_t *lfs,
|
|
|
+ const lfs_cache_t *pcache, lfs_cache_t *rcache,
|
|
|
+ lfs_block_t head, lfs_size_t size,
|
|
|
+ int (*cb)(void*, lfs_block_t), void *data) {
|
|
|
+ if (size == 0) {
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+
|
|
|
+ lfs_off_t index = lfs_ctz_index(lfs, &(lfs_off_t){size-1});
|
|
|
+
|
|
|
+ while (true) {
|
|
|
+ int err = cb(data, head);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (index == 0) {
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+
|
|
|
+ lfs_block_t heads[2];
|
|
|
+ int count = 2 - (index & 1);
|
|
|
+ err = lfs_bd_read(lfs,
|
|
|
+ pcache, rcache, count*sizeof(head),
|
|
|
+ head, 0, &heads, count*sizeof(head));
|
|
|
+ heads[0] = lfs_fromle32(heads[0]);
|
|
|
+ heads[1] = lfs_fromle32(heads[1]);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ for (int i = 0; i < count-1; i++) {
|
|
|
+ err = cb(data, heads[i]);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ head = heads[count-1];
|
|
|
+ index -= count;
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+/// Top level file operations ///
|
|
|
+int lfs_file_opencfg(lfs_t *lfs, lfs_file_t *file,
|
|
|
+ const char *path, int flags,
|
|
|
+ const struct lfs_file_config *cfg) {
|
|
|
+ LFS_TRACE("lfs_file_opencfg(%p, %p, \"%s\", %x, %p {"
|
|
|
+ ".buffer=%p, .attrs=%p, .attr_count=%"PRIu32"})",
|
|
|
+ (void*)lfs, (void*)file, path, flags,
|
|
|
+ (void*)cfg, cfg->buffer, (void*)cfg->attrs, cfg->attr_count);
|
|
|
+
|
|
|
+ // deorphan if we haven't yet, needed at most once after poweron
|
|
|
+ if ((flags & 3) != LFS_O_RDONLY) {
|
|
|
+ int err = lfs_fs_forceconsistency(lfs);
|
|
|
+ if (err) {
|
|
|
+ LFS_TRACE("lfs_file_opencfg -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // setup simple file details
|
|
|
+ int err;
|
|
|
+ file->cfg = cfg;
|
|
|
+ file->flags = flags | LFS_F_OPENED;
|
|
|
+ file->pos = 0;
|
|
|
+ file->off = 0;
|
|
|
+ file->cache.buffer = NULL;
|
|
|
+
|
|
|
+ // allocate entry for file if it doesn't exist
|
|
|
+ lfs_stag_t tag = lfs_dir_find(lfs, &file->m, &path, &file->id);
|
|
|
+ if (tag < 0 && !(tag == LFS_ERR_NOENT && file->id != 0x3ff)) {
|
|
|
+ err = tag;
|
|
|
+ goto cleanup;
|
|
|
+ }
|
|
|
+
|
|
|
+ // get id, add to list of mdirs to catch update changes
|
|
|
+ file->type = LFS_TYPE_REG;
|
|
|
+ file->next = (lfs_file_t*)lfs->mlist;
|
|
|
+ lfs->mlist = (struct lfs_mlist*)file;
|
|
|
+
|
|
|
+ if (tag == LFS_ERR_NOENT) {
|
|
|
+ if (!(flags & LFS_O_CREAT)) {
|
|
|
+ err = LFS_ERR_NOENT;
|
|
|
+ goto cleanup;
|
|
|
+ }
|
|
|
+
|
|
|
+ // check that name fits
|
|
|
+ lfs_size_t nlen = strlen(path);
|
|
|
+ if (nlen > lfs->name_max) {
|
|
|
+ err = LFS_ERR_NAMETOOLONG;
|
|
|
+ goto cleanup;
|
|
|
+ }
|
|
|
+
|
|
|
+ // get next slot and create entry to remember name
|
|
|
+ err = lfs_dir_commit(lfs, &file->m, LFS_MKATTRS(
|
|
|
+ {LFS_MKTAG(LFS_TYPE_CREATE, file->id, 0), NULL},
|
|
|
+ {LFS_MKTAG(LFS_TYPE_REG, file->id, nlen), path},
|
|
|
+ {LFS_MKTAG(LFS_TYPE_INLINESTRUCT, file->id, 0), NULL}));
|
|
|
+ if (err) {
|
|
|
+ err = LFS_ERR_NAMETOOLONG;
|
|
|
+ goto cleanup;
|
|
|
+ }
|
|
|
+
|
|
|
+ tag = LFS_MKTAG(LFS_TYPE_INLINESTRUCT, 0, 0);
|
|
|
+ } else if (flags & LFS_O_EXCL) {
|
|
|
+ err = LFS_ERR_EXIST;
|
|
|
+ goto cleanup;
|
|
|
+ } else if (lfs_tag_type3(tag) != LFS_TYPE_REG) {
|
|
|
+ err = LFS_ERR_ISDIR;
|
|
|
+ goto cleanup;
|
|
|
+ } else if (flags & LFS_O_TRUNC) {
|
|
|
+ // truncate if requested
|
|
|
+ tag = LFS_MKTAG(LFS_TYPE_INLINESTRUCT, file->id, 0);
|
|
|
+ file->flags |= LFS_F_DIRTY;
|
|
|
+ } else {
|
|
|
+ // try to load what's on disk, if it's inlined we'll fix it later
|
|
|
+ tag = lfs_dir_get(lfs, &file->m, LFS_MKTAG(0x700, 0x3ff, 0),
|
|
|
+ LFS_MKTAG(LFS_TYPE_STRUCT, file->id, 8), &file->ctz);
|
|
|
+ if (tag < 0) {
|
|
|
+ err = tag;
|
|
|
+ goto cleanup;
|
|
|
+ }
|
|
|
+ lfs_ctz_fromle32(&file->ctz);
|
|
|
+ }
|
|
|
+
|
|
|
+ // fetch attrs
|
|
|
+ for (unsigned i = 0; i < file->cfg->attr_count; i++) {
|
|
|
+ if ((file->flags & 3) != LFS_O_WRONLY) {
|
|
|
+ lfs_stag_t res = lfs_dir_get(lfs, &file->m,
|
|
|
+ LFS_MKTAG(0x7ff, 0x3ff, 0),
|
|
|
+ LFS_MKTAG(LFS_TYPE_USERATTR + file->cfg->attrs[i].type,
|
|
|
+ file->id, file->cfg->attrs[i].size),
|
|
|
+ file->cfg->attrs[i].buffer);
|
|
|
+ if (res < 0 && res != LFS_ERR_NOENT) {
|
|
|
+ err = res;
|
|
|
+ goto cleanup;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ if ((file->flags & 3) != LFS_O_RDONLY) {
|
|
|
+ if (file->cfg->attrs[i].size > lfs->attr_max) {
|
|
|
+ err = LFS_ERR_NOSPC;
|
|
|
+ goto cleanup;
|
|
|
+ }
|
|
|
+
|
|
|
+ file->flags |= LFS_F_DIRTY;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // allocate buffer if needed
|
|
|
+ if (file->cfg->buffer) {
|
|
|
+ file->cache.buffer = file->cfg->buffer;
|
|
|
+ } else {
|
|
|
+ file->cache.buffer = lfs_malloc(lfs->cfg->cache_size);
|
|
|
+ if (!file->cache.buffer) {
|
|
|
+ err = LFS_ERR_NOMEM;
|
|
|
+ goto cleanup;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // zero to avoid information leak
|
|
|
+ lfs_cache_zero(lfs, &file->cache);
|
|
|
+
|
|
|
+ if (lfs_tag_type3(tag) == LFS_TYPE_INLINESTRUCT) {
|
|
|
+ // load inline files
|
|
|
+ file->ctz.head = LFS_BLOCK_INLINE;
|
|
|
+ file->ctz.size = lfs_tag_size(tag);
|
|
|
+ file->flags |= LFS_F_INLINE;
|
|
|
+ file->cache.block = file->ctz.head;
|
|
|
+ file->cache.off = 0;
|
|
|
+ file->cache.size = lfs->cfg->cache_size;
|
|
|
+
|
|
|
+ // don't always read (may be new/trunc file)
|
|
|
+ if (file->ctz.size > 0) {
|
|
|
+ lfs_stag_t res = lfs_dir_get(lfs, &file->m,
|
|
|
+ LFS_MKTAG(0x700, 0x3ff, 0),
|
|
|
+ LFS_MKTAG(LFS_TYPE_STRUCT, file->id,
|
|
|
+ lfs_min(file->cache.size, 0x3fe)),
|
|
|
+ file->cache.buffer);
|
|
|
+ if (res < 0) {
|
|
|
+ err = res;
|
|
|
+ goto cleanup;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ LFS_TRACE("lfs_file_opencfg -> %d", 0);
|
|
|
+ return 0;
|
|
|
+
|
|
|
+cleanup:
|
|
|
+ // clean up lingering resources
|
|
|
+ file->flags |= LFS_F_ERRED;
|
|
|
+ lfs_file_close(lfs, file);
|
|
|
+ LFS_TRACE("lfs_file_opencfg -> %d", err);
|
|
|
+ return err;
|
|
|
+}
|
|
|
+
|
|
|
+int lfs_file_open(lfs_t *lfs, lfs_file_t *file,
|
|
|
+ const char *path, int flags) {
|
|
|
+ LFS_TRACE("lfs_file_open(%p, %p, \"%s\", %x)",
|
|
|
+ (void*)lfs, (void*)file, path, flags);
|
|
|
+ static const struct lfs_file_config defaults = {0};
|
|
|
+ int err = lfs_file_opencfg(lfs, file, path, flags, &defaults);
|
|
|
+ LFS_TRACE("lfs_file_open -> %d", err);
|
|
|
+ return err;
|
|
|
+}
|
|
|
+
|
|
|
+int lfs_file_close(lfs_t *lfs, lfs_file_t *file) {
|
|
|
+ LFS_TRACE("lfs_file_close(%p, %p)", (void*)lfs, (void*)file);
|
|
|
+ LFS_ASSERT(file->flags & LFS_F_OPENED);
|
|
|
+
|
|
|
+ int err = lfs_file_sync(lfs, file);
|
|
|
+
|
|
|
+ // remove from list of mdirs
|
|
|
+ for (struct lfs_mlist **p = &lfs->mlist; *p; p = &(*p)->next) {
|
|
|
+ if (*p == (struct lfs_mlist*)file) {
|
|
|
+ *p = (*p)->next;
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // clean up memory
|
|
|
+ if (!file->cfg->buffer) {
|
|
|
+ lfs_free(file->cache.buffer);
|
|
|
+ }
|
|
|
+
|
|
|
+ file->flags &= ~LFS_F_OPENED;
|
|
|
+ LFS_TRACE("lfs_file_close -> %d", err);
|
|
|
+ return err;
|
|
|
+}
|
|
|
+
|
|
|
+static int lfs_file_relocate(lfs_t *lfs, lfs_file_t *file) {
|
|
|
+ LFS_ASSERT(file->flags & LFS_F_OPENED);
|
|
|
+
|
|
|
+ while (true) {
|
|
|
+ // just relocate what exists into new block
|
|
|
+ lfs_block_t nblock;
|
|
|
+ int err = lfs_alloc(lfs, &nblock);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ err = lfs_bd_erase(lfs, nblock);
|
|
|
+ if (err) {
|
|
|
+ if (err == LFS_ERR_CORRUPT) {
|
|
|
+ goto relocate;
|
|
|
+ }
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ // either read from dirty cache or disk
|
|
|
+ for (lfs_off_t i = 0; i < file->off; i++) {
|
|
|
+ uint8_t data;
|
|
|
+ if (file->flags & LFS_F_INLINE) {
|
|
|
+ err = lfs_dir_getread(lfs, &file->m,
|
|
|
+ // note we evict inline files before they can be dirty
|
|
|
+ NULL, &file->cache, file->off-i,
|
|
|
+ LFS_MKTAG(0xfff, 0x1ff, 0),
|
|
|
+ LFS_MKTAG(LFS_TYPE_INLINESTRUCT, file->id, 0),
|
|
|
+ i, &data, 1);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ } else {
|
|
|
+ err = lfs_bd_read(lfs,
|
|
|
+ &file->cache, &lfs->rcache, file->off-i,
|
|
|
+ file->block, i, &data, 1);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ err = lfs_bd_prog(lfs,
|
|
|
+ &lfs->pcache, &lfs->rcache, true,
|
|
|
+ nblock, i, &data, 1);
|
|
|
+ if (err) {
|
|
|
+ if (err == LFS_ERR_CORRUPT) {
|
|
|
+ goto relocate;
|
|
|
+ }
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // copy over new state of file
|
|
|
+ memcpy(file->cache.buffer, lfs->pcache.buffer, lfs->cfg->cache_size);
|
|
|
+ file->cache.block = lfs->pcache.block;
|
|
|
+ file->cache.off = lfs->pcache.off;
|
|
|
+ file->cache.size = lfs->pcache.size;
|
|
|
+ lfs_cache_zero(lfs, &lfs->pcache);
|
|
|
+
|
|
|
+ file->block = nblock;
|
|
|
+ file->flags |= LFS_F_WRITING;
|
|
|
+ return 0;
|
|
|
+
|
|
|
+relocate:
|
|
|
+ LFS_DEBUG("Bad block at %"PRIx32, nblock);
|
|
|
+
|
|
|
+ // just clear cache and try a new block
|
|
|
+ lfs_cache_drop(lfs, &lfs->pcache);
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+static int lfs_file_outline(lfs_t *lfs, lfs_file_t *file) {
|
|
|
+ file->off = file->pos;
|
|
|
+ lfs_alloc_ack(lfs);
|
|
|
+ int err = lfs_file_relocate(lfs, file);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ file->flags &= ~LFS_F_INLINE;
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static int lfs_file_flush(lfs_t *lfs, lfs_file_t *file) {
|
|
|
+ LFS_ASSERT(file->flags & LFS_F_OPENED);
|
|
|
+
|
|
|
+ if (file->flags & LFS_F_READING) {
|
|
|
+ if (!(file->flags & LFS_F_INLINE)) {
|
|
|
+ lfs_cache_drop(lfs, &file->cache);
|
|
|
+ }
|
|
|
+ file->flags &= ~LFS_F_READING;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (file->flags & LFS_F_WRITING) {
|
|
|
+ lfs_off_t pos = file->pos;
|
|
|
+
|
|
|
+ if (!(file->flags & LFS_F_INLINE)) {
|
|
|
+ // copy over anything after current branch
|
|
|
+ lfs_file_t orig = {
|
|
|
+ .ctz.head = file->ctz.head,
|
|
|
+ .ctz.size = file->ctz.size,
|
|
|
+ .flags = LFS_O_RDONLY | LFS_F_OPENED,
|
|
|
+ .pos = file->pos,
|
|
|
+ .cache = lfs->rcache,
|
|
|
+ };
|
|
|
+ lfs_cache_drop(lfs, &lfs->rcache);
|
|
|
+
|
|
|
+ while (file->pos < file->ctz.size) {
|
|
|
+ // copy over a byte at a time, leave it up to caching
|
|
|
+ // to make this efficient
|
|
|
+ uint8_t data;
|
|
|
+ lfs_ssize_t res = lfs_file_read(lfs, &orig, &data, 1);
|
|
|
+ if (res < 0) {
|
|
|
+ return res;
|
|
|
+ }
|
|
|
+
|
|
|
+ res = lfs_file_write(lfs, file, &data, 1);
|
|
|
+ if (res < 0) {
|
|
|
+ return res;
|
|
|
+ }
|
|
|
+
|
|
|
+ // keep our reference to the rcache in sync
|
|
|
+ if (lfs->rcache.block != LFS_BLOCK_NULL) {
|
|
|
+ lfs_cache_drop(lfs, &orig.cache);
|
|
|
+ lfs_cache_drop(lfs, &lfs->rcache);
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // write out what we have
|
|
|
+ while (true) {
|
|
|
+ int err = lfs_bd_flush(lfs, &file->cache, &lfs->rcache, true);
|
|
|
+ if (err) {
|
|
|
+ if (err == LFS_ERR_CORRUPT) {
|
|
|
+ goto relocate;
|
|
|
+ }
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ break;
|
|
|
+
|
|
|
+relocate:
|
|
|
+ LFS_DEBUG("Bad block at %"PRIx32, file->block);
|
|
|
+ err = lfs_file_relocate(lfs, file);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ } else {
|
|
|
+ file->pos = lfs_max(file->pos, file->ctz.size);
|
|
|
+ }
|
|
|
+
|
|
|
+ // actual file updates
|
|
|
+ file->ctz.head = file->block;
|
|
|
+ file->ctz.size = file->pos;
|
|
|
+ file->flags &= ~LFS_F_WRITING;
|
|
|
+ file->flags |= LFS_F_DIRTY;
|
|
|
+
|
|
|
+ file->pos = pos;
|
|
|
+ }
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+int lfs_file_sync(lfs_t *lfs, lfs_file_t *file) {
|
|
|
+ LFS_TRACE("lfs_file_sync(%p, %p)", (void*)lfs, (void*)file);
|
|
|
+ LFS_ASSERT(file->flags & LFS_F_OPENED);
|
|
|
+
|
|
|
+ while (true) {
|
|
|
+ int err = lfs_file_flush(lfs, file);
|
|
|
+ if (err) {
|
|
|
+ file->flags |= LFS_F_ERRED;
|
|
|
+ LFS_TRACE("lfs_file_sync -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ if ((file->flags & LFS_F_DIRTY) &&
|
|
|
+ !(file->flags & LFS_F_ERRED) &&
|
|
|
+ !lfs_pair_isnull(file->m.pair)) {
|
|
|
+ // update dir entry
|
|
|
+ uint16_t type;
|
|
|
+ const void *buffer;
|
|
|
+ lfs_size_t size;
|
|
|
+ struct lfs_ctz ctz;
|
|
|
+ if (file->flags & LFS_F_INLINE) {
|
|
|
+ // inline the whole file
|
|
|
+ type = LFS_TYPE_INLINESTRUCT;
|
|
|
+ buffer = file->cache.buffer;
|
|
|
+ size = file->ctz.size;
|
|
|
+ } else {
|
|
|
+ // update the ctz reference
|
|
|
+ type = LFS_TYPE_CTZSTRUCT;
|
|
|
+ // copy ctz so alloc will work during a relocate
|
|
|
+ ctz = file->ctz;
|
|
|
+ lfs_ctz_tole32(&ctz);
|
|
|
+ buffer = &ctz;
|
|
|
+ size = sizeof(ctz);
|
|
|
+ }
|
|
|
+
|
|
|
+ // commit file data and attributes
|
|
|
+ err = lfs_dir_commit(lfs, &file->m, LFS_MKATTRS(
|
|
|
+ {LFS_MKTAG(type, file->id, size), buffer},
|
|
|
+ {LFS_MKTAG(LFS_FROM_USERATTRS, file->id,
|
|
|
+ file->cfg->attr_count), file->cfg->attrs}));
|
|
|
+ if (err) {
|
|
|
+ if (err == LFS_ERR_NOSPC && (file->flags & LFS_F_INLINE)) {
|
|
|
+ goto relocate;
|
|
|
+ }
|
|
|
+ file->flags |= LFS_F_ERRED;
|
|
|
+ LFS_TRACE("lfs_file_sync -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ file->flags &= ~LFS_F_DIRTY;
|
|
|
+ }
|
|
|
+
|
|
|
+ LFS_TRACE("lfs_file_sync -> %d", 0);
|
|
|
+ return 0;
|
|
|
+
|
|
|
+relocate:
|
|
|
+ // inline file doesn't fit anymore
|
|
|
+ err = lfs_file_outline(lfs, file);
|
|
|
+ if (err) {
|
|
|
+ file->flags |= LFS_F_ERRED;
|
|
|
+ LFS_TRACE("lfs_file_sync -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+lfs_ssize_t lfs_file_read(lfs_t *lfs, lfs_file_t *file,
|
|
|
+ void *buffer, lfs_size_t size) {
|
|
|
+ LFS_TRACE("lfs_file_read(%p, %p, %p, %"PRIu32")",
|
|
|
+ (void*)lfs, (void*)file, buffer, size);
|
|
|
+ LFS_ASSERT(file->flags & LFS_F_OPENED);
|
|
|
+ LFS_ASSERT((file->flags & 3) != LFS_O_WRONLY);
|
|
|
+
|
|
|
+ uint8_t *data = buffer;
|
|
|
+ lfs_size_t nsize = size;
|
|
|
+
|
|
|
+ if (file->flags & LFS_F_WRITING) {
|
|
|
+ // flush out any writes
|
|
|
+ int err = lfs_file_flush(lfs, file);
|
|
|
+ if (err) {
|
|
|
+ LFS_TRACE("lfs_file_read -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ if (file->pos >= file->ctz.size) {
|
|
|
+ // eof if past end
|
|
|
+ LFS_TRACE("lfs_file_read -> %d", 0);
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+
|
|
|
+ size = lfs_min(size, file->ctz.size - file->pos);
|
|
|
+ nsize = size;
|
|
|
+
|
|
|
+ while (nsize > 0) {
|
|
|
+ // check if we need a new block
|
|
|
+ if (!(file->flags & LFS_F_READING) ||
|
|
|
+ file->off == lfs->cfg->block_size) {
|
|
|
+ if (!(file->flags & LFS_F_INLINE)) {
|
|
|
+ int err = lfs_ctz_find(lfs, NULL, &file->cache,
|
|
|
+ file->ctz.head, file->ctz.size,
|
|
|
+ file->pos, &file->block, &file->off);
|
|
|
+ if (err) {
|
|
|
+ LFS_TRACE("lfs_file_read -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ } else {
|
|
|
+ file->block = LFS_BLOCK_INLINE;
|
|
|
+ file->off = file->pos;
|
|
|
+ }
|
|
|
+
|
|
|
+ file->flags |= LFS_F_READING;
|
|
|
+ }
|
|
|
+
|
|
|
+ // read as much as we can in current block
|
|
|
+ lfs_size_t diff = lfs_min(nsize, lfs->cfg->block_size - file->off);
|
|
|
+ if (file->flags & LFS_F_INLINE) {
|
|
|
+ int err = lfs_dir_getread(lfs, &file->m,
|
|
|
+ NULL, &file->cache, lfs->cfg->block_size,
|
|
|
+ LFS_MKTAG(0xfff, 0x1ff, 0),
|
|
|
+ LFS_MKTAG(LFS_TYPE_INLINESTRUCT, file->id, 0),
|
|
|
+ file->off, data, diff);
|
|
|
+ if (err) {
|
|
|
+ LFS_TRACE("lfs_file_read -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ } else {
|
|
|
+ int err = lfs_bd_read(lfs,
|
|
|
+ NULL, &file->cache, lfs->cfg->block_size,
|
|
|
+ file->block, file->off, data, diff);
|
|
|
+ if (err) {
|
|
|
+ LFS_TRACE("lfs_file_read -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ file->pos += diff;
|
|
|
+ file->off += diff;
|
|
|
+ data += diff;
|
|
|
+ nsize -= diff;
|
|
|
+ }
|
|
|
+
|
|
|
+ LFS_TRACE("lfs_file_read -> %"PRId32, size);
|
|
|
+ return size;
|
|
|
+}
|
|
|
+
|
|
|
+lfs_ssize_t lfs_file_write(lfs_t *lfs, lfs_file_t *file,
|
|
|
+ const void *buffer, lfs_size_t size) {
|
|
|
+ LFS_TRACE("lfs_file_write(%p, %p, %p, %"PRIu32")",
|
|
|
+ (void*)lfs, (void*)file, buffer, size);
|
|
|
+ LFS_ASSERT(file->flags & LFS_F_OPENED);
|
|
|
+ LFS_ASSERT((file->flags & 3) != LFS_O_RDONLY);
|
|
|
+
|
|
|
+ const uint8_t *data = buffer;
|
|
|
+ lfs_size_t nsize = size;
|
|
|
+
|
|
|
+ if (file->flags & LFS_F_READING) {
|
|
|
+ // drop any reads
|
|
|
+ int err = lfs_file_flush(lfs, file);
|
|
|
+ if (err) {
|
|
|
+ LFS_TRACE("lfs_file_write -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ if ((file->flags & LFS_O_APPEND) && file->pos < file->ctz.size) {
|
|
|
+ file->pos = file->ctz.size;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (file->pos + size > lfs->file_max) {
|
|
|
+ // Larger than file limit?
|
|
|
+ LFS_TRACE("lfs_file_write -> %d", LFS_ERR_FBIG);
|
|
|
+ return LFS_ERR_FBIG;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (!(file->flags & LFS_F_WRITING) && file->pos > file->ctz.size) {
|
|
|
+ // fill with zeros
|
|
|
+ lfs_off_t pos = file->pos;
|
|
|
+ file->pos = file->ctz.size;
|
|
|
+
|
|
|
+ while (file->pos < pos) {
|
|
|
+ lfs_ssize_t res = lfs_file_write(lfs, file, &(uint8_t){0}, 1);
|
|
|
+ if (res < 0) {
|
|
|
+ LFS_TRACE("lfs_file_write -> %"PRId32, res);
|
|
|
+ return res;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ if ((file->flags & LFS_F_INLINE) &&
|
|
|
+ lfs_max(file->pos+nsize, file->ctz.size) >
|
|
|
+ lfs_min(0x3fe, lfs_min(
|
|
|
+ lfs->cfg->cache_size, lfs->cfg->block_size/8))) {
|
|
|
+ // inline file doesn't fit anymore
|
|
|
+ int err = lfs_file_outline(lfs, file);
|
|
|
+ if (err) {
|
|
|
+ file->flags |= LFS_F_ERRED;
|
|
|
+ LFS_TRACE("lfs_file_write -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ while (nsize > 0) {
|
|
|
+ // check if we need a new block
|
|
|
+ if (!(file->flags & LFS_F_WRITING) ||
|
|
|
+ file->off == lfs->cfg->block_size) {
|
|
|
+ if (!(file->flags & LFS_F_INLINE)) {
|
|
|
+ if (!(file->flags & LFS_F_WRITING) && file->pos > 0) {
|
|
|
+ // find out which block we're extending from
|
|
|
+ int err = lfs_ctz_find(lfs, NULL, &file->cache,
|
|
|
+ file->ctz.head, file->ctz.size,
|
|
|
+ file->pos-1, &file->block, &file->off);
|
|
|
+ if (err) {
|
|
|
+ file->flags |= LFS_F_ERRED;
|
|
|
+ LFS_TRACE("lfs_file_write -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ // mark cache as dirty since we may have read data into it
|
|
|
+ lfs_cache_zero(lfs, &file->cache);
|
|
|
+ }
|
|
|
+
|
|
|
+ // extend file with new blocks
|
|
|
+ lfs_alloc_ack(lfs);
|
|
|
+ int err = lfs_ctz_extend(lfs, &file->cache, &lfs->rcache,
|
|
|
+ file->block, file->pos,
|
|
|
+ &file->block, &file->off);
|
|
|
+ if (err) {
|
|
|
+ file->flags |= LFS_F_ERRED;
|
|
|
+ LFS_TRACE("lfs_file_write -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ } else {
|
|
|
+ file->block = LFS_BLOCK_INLINE;
|
|
|
+ file->off = file->pos;
|
|
|
+ }
|
|
|
+
|
|
|
+ file->flags |= LFS_F_WRITING;
|
|
|
+ }
|
|
|
+
|
|
|
+ // program as much as we can in current block
|
|
|
+ lfs_size_t diff = lfs_min(nsize, lfs->cfg->block_size - file->off);
|
|
|
+ while (true) {
|
|
|
+ int err = lfs_bd_prog(lfs, &file->cache, &lfs->rcache, true,
|
|
|
+ file->block, file->off, data, diff);
|
|
|
+ if (err) {
|
|
|
+ if (err == LFS_ERR_CORRUPT) {
|
|
|
+ goto relocate;
|
|
|
+ }
|
|
|
+ file->flags |= LFS_F_ERRED;
|
|
|
+ LFS_TRACE("lfs_file_write -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ break;
|
|
|
+relocate:
|
|
|
+ err = lfs_file_relocate(lfs, file);
|
|
|
+ if (err) {
|
|
|
+ file->flags |= LFS_F_ERRED;
|
|
|
+ LFS_TRACE("lfs_file_write -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ file->pos += diff;
|
|
|
+ file->off += diff;
|
|
|
+ data += diff;
|
|
|
+ nsize -= diff;
|
|
|
+
|
|
|
+ lfs_alloc_ack(lfs);
|
|
|
+ }
|
|
|
+
|
|
|
+ file->flags &= ~LFS_F_ERRED;
|
|
|
+ LFS_TRACE("lfs_file_write -> %"PRId32, size);
|
|
|
+ return size;
|
|
|
+}
|
|
|
+
|
|
|
+lfs_soff_t lfs_file_seek(lfs_t *lfs, lfs_file_t *file,
|
|
|
+ lfs_soff_t off, int whence) {
|
|
|
+ LFS_TRACE("lfs_file_seek(%p, %p, %"PRId32", %d)",
|
|
|
+ (void*)lfs, (void*)file, off, whence);
|
|
|
+ LFS_ASSERT(file->flags & LFS_F_OPENED);
|
|
|
+
|
|
|
+ // write out everything beforehand, may be noop if rdonly
|
|
|
+ int err = lfs_file_flush(lfs, file);
|
|
|
+ if (err) {
|
|
|
+ LFS_TRACE("lfs_file_seek -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ // find new pos
|
|
|
+ lfs_off_t npos = file->pos;
|
|
|
+ if (whence == LFS_SEEK_SET) {
|
|
|
+ npos = off;
|
|
|
+ } else if (whence == LFS_SEEK_CUR) {
|
|
|
+ npos = file->pos + off;
|
|
|
+ } else if (whence == LFS_SEEK_END) {
|
|
|
+ npos = file->ctz.size + off;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (npos > lfs->file_max) {
|
|
|
+ // file position out of range
|
|
|
+ LFS_TRACE("lfs_file_seek -> %d", LFS_ERR_INVAL);
|
|
|
+ return LFS_ERR_INVAL;
|
|
|
+ }
|
|
|
+
|
|
|
+ // update pos
|
|
|
+ file->pos = npos;
|
|
|
+ LFS_TRACE("lfs_file_seek -> %"PRId32, npos);
|
|
|
+ return npos;
|
|
|
+}
|
|
|
+
|
|
|
+int lfs_file_truncate(lfs_t *lfs, lfs_file_t *file, lfs_off_t size) {
|
|
|
+ LFS_TRACE("lfs_file_truncate(%p, %p, %"PRIu32")",
|
|
|
+ (void*)lfs, (void*)file, size);
|
|
|
+ LFS_ASSERT(file->flags & LFS_F_OPENED);
|
|
|
+ LFS_ASSERT((file->flags & 3) != LFS_O_RDONLY);
|
|
|
+
|
|
|
+ if (size > LFS_FILE_MAX) {
|
|
|
+ LFS_TRACE("lfs_file_truncate -> %d", LFS_ERR_INVAL);
|
|
|
+ return LFS_ERR_INVAL;
|
|
|
+ }
|
|
|
+
|
|
|
+ lfs_off_t pos = file->pos;
|
|
|
+ lfs_off_t oldsize = lfs_file_size(lfs, file);
|
|
|
+ if (size < oldsize) {
|
|
|
+ // need to flush since directly changing metadata
|
|
|
+ int err = lfs_file_flush(lfs, file);
|
|
|
+ if (err) {
|
|
|
+ LFS_TRACE("lfs_file_truncate -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ // lookup new head in ctz skip list
|
|
|
+ err = lfs_ctz_find(lfs, NULL, &file->cache,
|
|
|
+ file->ctz.head, file->ctz.size,
|
|
|
+ size, &file->block, &file->off);
|
|
|
+ if (err) {
|
|
|
+ LFS_TRACE("lfs_file_truncate -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ file->ctz.head = file->block;
|
|
|
+ file->ctz.size = size;
|
|
|
+ file->flags |= LFS_F_DIRTY | LFS_F_READING;
|
|
|
+ } else if (size > oldsize) {
|
|
|
+ // flush+seek if not already at end
|
|
|
+ if (file->pos != oldsize) {
|
|
|
+ lfs_soff_t res = lfs_file_seek(lfs, file, 0, LFS_SEEK_END);
|
|
|
+ if (res < 0) {
|
|
|
+ LFS_TRACE("lfs_file_truncate -> %"PRId32, res);
|
|
|
+ return (int)res;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // fill with zeros
|
|
|
+ while (file->pos < size) {
|
|
|
+ lfs_ssize_t res = lfs_file_write(lfs, file, &(uint8_t){0}, 1);
|
|
|
+ if (res < 0) {
|
|
|
+ LFS_TRACE("lfs_file_truncate -> %"PRId32, res);
|
|
|
+ return (int)res;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // restore pos
|
|
|
+ lfs_soff_t res = lfs_file_seek(lfs, file, pos, LFS_SEEK_SET);
|
|
|
+ if (res < 0) {
|
|
|
+ LFS_TRACE("lfs_file_truncate -> %"PRId32, res);
|
|
|
+ return (int)res;
|
|
|
+ }
|
|
|
+
|
|
|
+ LFS_TRACE("lfs_file_truncate -> %d", 0);
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+lfs_soff_t lfs_file_tell(lfs_t *lfs, lfs_file_t *file) {
|
|
|
+ LFS_TRACE("lfs_file_tell(%p, %p)", (void*)lfs, (void*)file);
|
|
|
+ LFS_ASSERT(file->flags & LFS_F_OPENED);
|
|
|
+ (void)lfs;
|
|
|
+ LFS_TRACE("lfs_file_tell -> %"PRId32, file->pos);
|
|
|
+ return file->pos;
|
|
|
+}
|
|
|
+
|
|
|
+int lfs_file_rewind(lfs_t *lfs, lfs_file_t *file) {
|
|
|
+ LFS_TRACE("lfs_file_rewind(%p, %p)", (void*)lfs, (void*)file);
|
|
|
+ lfs_soff_t res = lfs_file_seek(lfs, file, 0, LFS_SEEK_SET);
|
|
|
+ if (res < 0) {
|
|
|
+ LFS_TRACE("lfs_file_rewind -> %"PRId32, res);
|
|
|
+ return (int)res;
|
|
|
+ }
|
|
|
+
|
|
|
+ LFS_TRACE("lfs_file_rewind -> %d", 0);
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+lfs_soff_t lfs_file_size(lfs_t *lfs, lfs_file_t *file) {
|
|
|
+ LFS_TRACE("lfs_file_size(%p, %p)", (void*)lfs, (void*)file);
|
|
|
+ LFS_ASSERT(file->flags & LFS_F_OPENED);
|
|
|
+ (void)lfs;
|
|
|
+ if (file->flags & LFS_F_WRITING) {
|
|
|
+ LFS_TRACE("lfs_file_size -> %"PRId32,
|
|
|
+ lfs_max(file->pos, file->ctz.size));
|
|
|
+ return lfs_max(file->pos, file->ctz.size);
|
|
|
+ } else {
|
|
|
+ LFS_TRACE("lfs_file_size -> %"PRId32, file->ctz.size);
|
|
|
+ return file->ctz.size;
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+/// General fs operations ///
|
|
|
+int lfs_stat(lfs_t *lfs, const char *path, struct lfs_info *info) {
|
|
|
+ LFS_TRACE("lfs_stat(%p, \"%s\", %p)", (void*)lfs, path, (void*)info);
|
|
|
+ lfs_mdir_t cwd;
|
|
|
+ lfs_stag_t tag = lfs_dir_find(lfs, &cwd, &path, NULL);
|
|
|
+ if (tag < 0) {
|
|
|
+ LFS_TRACE("lfs_stat -> %"PRId32, tag);
|
|
|
+ return (int)tag;
|
|
|
+ }
|
|
|
+
|
|
|
+ int err = lfs_dir_getinfo(lfs, &cwd, lfs_tag_id(tag), info);
|
|
|
+ LFS_TRACE("lfs_stat -> %d", err);
|
|
|
+ return err;
|
|
|
+}
|
|
|
+
|
|
|
+int lfs_remove(lfs_t *lfs, const char *path) {
|
|
|
+ LFS_TRACE("lfs_remove(%p, \"%s\")", (void*)lfs, path);
|
|
|
+ // deorphan if we haven't yet, needed at most once after poweron
|
|
|
+ int err = lfs_fs_forceconsistency(lfs);
|
|
|
+ if (err) {
|
|
|
+ LFS_TRACE("lfs_remove -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ lfs_mdir_t cwd;
|
|
|
+ lfs_stag_t tag = lfs_dir_find(lfs, &cwd, &path, NULL);
|
|
|
+ if (tag < 0 || lfs_tag_id(tag) == 0x3ff) {
|
|
|
+ LFS_TRACE("lfs_remove -> %"PRId32, (tag < 0) ? tag : LFS_ERR_INVAL);
|
|
|
+ return (tag < 0) ? (int)tag : LFS_ERR_INVAL;
|
|
|
+ }
|
|
|
+
|
|
|
+ lfs_mdir_t dir;
|
|
|
+ if (lfs_tag_type3(tag) == LFS_TYPE_DIR) {
|
|
|
+ // must be empty before removal
|
|
|
+ lfs_block_t pair[2];
|
|
|
+ lfs_stag_t res = lfs_dir_get(lfs, &cwd, LFS_MKTAG(0x700, 0x3ff, 0),
|
|
|
+ LFS_MKTAG(LFS_TYPE_STRUCT, lfs_tag_id(tag), 8), pair);
|
|
|
+ if (res < 0) {
|
|
|
+ LFS_TRACE("lfs_remove -> %"PRId32, res);
|
|
|
+ return (int)res;
|
|
|
+ }
|
|
|
+ lfs_pair_fromle32(pair);
|
|
|
+
|
|
|
+ err = lfs_dir_fetch(lfs, &dir, pair);
|
|
|
+ if (err) {
|
|
|
+ LFS_TRACE("lfs_remove -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (dir.count > 0 || dir.split) {
|
|
|
+ LFS_TRACE("lfs_remove -> %d", LFS_ERR_NOTEMPTY);
|
|
|
+ return LFS_ERR_NOTEMPTY;
|
|
|
+ }
|
|
|
+
|
|
|
+ // mark fs as orphaned
|
|
|
+ lfs_fs_preporphans(lfs, +1);
|
|
|
+ }
|
|
|
+
|
|
|
+ // delete the entry
|
|
|
+ err = lfs_dir_commit(lfs, &cwd, LFS_MKATTRS(
|
|
|
+ {LFS_MKTAG(LFS_TYPE_DELETE, lfs_tag_id(tag), 0), NULL}));
|
|
|
+ if (err) {
|
|
|
+ LFS_TRACE("lfs_remove -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (lfs_tag_type3(tag) == LFS_TYPE_DIR) {
|
|
|
+ // fix orphan
|
|
|
+ lfs_fs_preporphans(lfs, -1);
|
|
|
+
|
|
|
+ err = lfs_fs_pred(lfs, dir.pair, &cwd);
|
|
|
+ if (err) {
|
|
|
+ LFS_TRACE("lfs_remove -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ err = lfs_dir_drop(lfs, &cwd, &dir);
|
|
|
+ if (err) {
|
|
|
+ LFS_TRACE("lfs_remove -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ LFS_TRACE("lfs_remove -> %d", 0);
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+int lfs_rename(lfs_t *lfs, const char *oldpath, const char *newpath) {
|
|
|
+ LFS_TRACE("lfs_rename(%p, \"%s\", \"%s\")", (void*)lfs, oldpath, newpath);
|
|
|
+
|
|
|
+ // deorphan if we haven't yet, needed at most once after poweron
|
|
|
+ int err = lfs_fs_forceconsistency(lfs);
|
|
|
+ if (err) {
|
|
|
+ LFS_TRACE("lfs_rename -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ // find old entry
|
|
|
+ lfs_mdir_t oldcwd;
|
|
|
+ lfs_stag_t oldtag = lfs_dir_find(lfs, &oldcwd, &oldpath, NULL);
|
|
|
+ if (oldtag < 0 || lfs_tag_id(oldtag) == 0x3ff) {
|
|
|
+ LFS_TRACE("lfs_rename -> %"PRId32, (oldtag < 0) ? oldtag : LFS_ERR_INVAL);
|
|
|
+ return (oldtag < 0) ? (int)oldtag : LFS_ERR_INVAL;
|
|
|
+ }
|
|
|
+
|
|
|
+ // find new entry
|
|
|
+ lfs_mdir_t newcwd;
|
|
|
+ uint16_t newid;
|
|
|
+ lfs_stag_t prevtag = lfs_dir_find(lfs, &newcwd, &newpath, &newid);
|
|
|
+ if ((prevtag < 0 || lfs_tag_id(prevtag) == 0x3ff) &&
|
|
|
+ !(prevtag == LFS_ERR_NOENT && newid != 0x3ff)) {
|
|
|
+ LFS_TRACE("lfs_rename -> %"PRId32, (prevtag < 0) ? prevtag : LFS_ERR_INVAL);
|
|
|
+ return (prevtag < 0) ? (int)prevtag : LFS_ERR_INVAL;
|
|
|
+ }
|
|
|
+
|
|
|
+ lfs_mdir_t prevdir;
|
|
|
+ if (prevtag == LFS_ERR_NOENT) {
|
|
|
+ // check that name fits
|
|
|
+ lfs_size_t nlen = strlen(newpath);
|
|
|
+ if (nlen > lfs->name_max) {
|
|
|
+ LFS_TRACE("lfs_rename -> %d", LFS_ERR_NAMETOOLONG);
|
|
|
+ return LFS_ERR_NAMETOOLONG;
|
|
|
+ }
|
|
|
+ } else if (lfs_tag_type3(prevtag) != lfs_tag_type3(oldtag)) {
|
|
|
+ LFS_TRACE("lfs_rename -> %d", LFS_ERR_ISDIR);
|
|
|
+ return LFS_ERR_ISDIR;
|
|
|
+ } else if (lfs_tag_type3(prevtag) == LFS_TYPE_DIR) {
|
|
|
+ // must be empty before removal
|
|
|
+ lfs_block_t prevpair[2];
|
|
|
+ lfs_stag_t res = lfs_dir_get(lfs, &newcwd, LFS_MKTAG(0x700, 0x3ff, 0),
|
|
|
+ LFS_MKTAG(LFS_TYPE_STRUCT, newid, 8), prevpair);
|
|
|
+ if (res < 0) {
|
|
|
+ LFS_TRACE("lfs_rename -> %"PRId32, res);
|
|
|
+ return (int)res;
|
|
|
+ }
|
|
|
+ lfs_pair_fromle32(prevpair);
|
|
|
+
|
|
|
+ // must be empty before removal
|
|
|
+ err = lfs_dir_fetch(lfs, &prevdir, prevpair);
|
|
|
+ if (err) {
|
|
|
+ LFS_TRACE("lfs_rename -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (prevdir.count > 0 || prevdir.split) {
|
|
|
+ LFS_TRACE("lfs_rename -> %d", LFS_ERR_NOTEMPTY);
|
|
|
+ return LFS_ERR_NOTEMPTY;
|
|
|
+ }
|
|
|
+
|
|
|
+ // mark fs as orphaned
|
|
|
+ lfs_fs_preporphans(lfs, +1);
|
|
|
+ }
|
|
|
+
|
|
|
+ // create move to fix later
|
|
|
+ uint16_t newoldtagid = lfs_tag_id(oldtag);
|
|
|
+ if (lfs_pair_cmp(oldcwd.pair, newcwd.pair) == 0 &&
|
|
|
+ prevtag == LFS_ERR_NOENT && newid <= newoldtagid) {
|
|
|
+ // there is a small chance we are being renamed in the same directory
|
|
|
+ // to an id less than our old id, the global update to handle this
|
|
|
+ // is a bit messy
|
|
|
+ newoldtagid += 1;
|
|
|
+ }
|
|
|
+
|
|
|
+ lfs_fs_prepmove(lfs, newoldtagid, oldcwd.pair);
|
|
|
+
|
|
|
+ // move over all attributes
|
|
|
+ err = lfs_dir_commit(lfs, &newcwd, LFS_MKATTRS(
|
|
|
+ {prevtag != LFS_ERR_NOENT
|
|
|
+ ? LFS_MKTAG(LFS_TYPE_DELETE, newid, 0)
|
|
|
+ : LFS_MKTAG(LFS_FROM_NOOP, 0, 0), NULL},
|
|
|
+ {LFS_MKTAG(LFS_TYPE_CREATE, newid, 0), NULL},
|
|
|
+ {LFS_MKTAG(lfs_tag_type3(oldtag), newid, strlen(newpath)),
|
|
|
+ newpath},
|
|
|
+ {LFS_MKTAG(LFS_FROM_MOVE, newid, lfs_tag_id(oldtag)), &oldcwd}));
|
|
|
+ if (err) {
|
|
|
+ LFS_TRACE("lfs_rename -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ // let commit clean up after move (if we're different! otherwise move
|
|
|
+ // logic already fixed it for us)
|
|
|
+ if (lfs_pair_cmp(oldcwd.pair, newcwd.pair) != 0) {
|
|
|
+ err = lfs_dir_commit(lfs, &oldcwd, NULL, 0);
|
|
|
+ if (err) {
|
|
|
+ LFS_TRACE("lfs_rename -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ if (prevtag != LFS_ERR_NOENT && lfs_tag_type3(prevtag) == LFS_TYPE_DIR) {
|
|
|
+ // fix orphan
|
|
|
+ lfs_fs_preporphans(lfs, -1);
|
|
|
+
|
|
|
+ err = lfs_fs_pred(lfs, prevdir.pair, &newcwd);
|
|
|
+ if (err) {
|
|
|
+ LFS_TRACE("lfs_rename -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ err = lfs_dir_drop(lfs, &newcwd, &prevdir);
|
|
|
+ if (err) {
|
|
|
+ LFS_TRACE("lfs_rename -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ LFS_TRACE("lfs_rename -> %d", 0);
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+lfs_ssize_t lfs_getattr(lfs_t *lfs, const char *path,
|
|
|
+ uint8_t type, void *buffer, lfs_size_t size) {
|
|
|
+ LFS_TRACE("lfs_getattr(%p, \"%s\", %"PRIu8", %p, %"PRIu32")",
|
|
|
+ (void*)lfs, path, type, buffer, size);
|
|
|
+ lfs_mdir_t cwd;
|
|
|
+ lfs_stag_t tag = lfs_dir_find(lfs, &cwd, &path, NULL);
|
|
|
+ if (tag < 0) {
|
|
|
+ LFS_TRACE("lfs_getattr -> %"PRId32, tag);
|
|
|
+ return tag;
|
|
|
+ }
|
|
|
+
|
|
|
+ uint16_t id = lfs_tag_id(tag);
|
|
|
+ if (id == 0x3ff) {
|
|
|
+ // special case for root
|
|
|
+ id = 0;
|
|
|
+ int err = lfs_dir_fetch(lfs, &cwd, lfs->root);
|
|
|
+ if (err) {
|
|
|
+ LFS_TRACE("lfs_getattr -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ tag = lfs_dir_get(lfs, &cwd, LFS_MKTAG(0x7ff, 0x3ff, 0),
|
|
|
+ LFS_MKTAG(LFS_TYPE_USERATTR + type,
|
|
|
+ id, lfs_min(size, lfs->attr_max)),
|
|
|
+ buffer);
|
|
|
+ if (tag < 0) {
|
|
|
+ if (tag == LFS_ERR_NOENT) {
|
|
|
+ LFS_TRACE("lfs_getattr -> %d", LFS_ERR_NOATTR);
|
|
|
+ return LFS_ERR_NOATTR;
|
|
|
+ }
|
|
|
+
|
|
|
+ LFS_TRACE("lfs_getattr -> %"PRId32, tag);
|
|
|
+ return tag;
|
|
|
+ }
|
|
|
+
|
|
|
+ size = lfs_tag_size(tag);
|
|
|
+ LFS_TRACE("lfs_getattr -> %"PRId32, size);
|
|
|
+ return size;
|
|
|
+}
|
|
|
+
|
|
|
+static int lfs_commitattr(lfs_t *lfs, const char *path,
|
|
|
+ uint8_t type, const void *buffer, lfs_size_t size) {
|
|
|
+ lfs_mdir_t cwd;
|
|
|
+ lfs_stag_t tag = lfs_dir_find(lfs, &cwd, &path, NULL);
|
|
|
+ if (tag < 0) {
|
|
|
+ return tag;
|
|
|
+ }
|
|
|
+
|
|
|
+ uint16_t id = lfs_tag_id(tag);
|
|
|
+ if (id == 0x3ff) {
|
|
|
+ // special case for root
|
|
|
+ id = 0;
|
|
|
+ int err = lfs_dir_fetch(lfs, &cwd, lfs->root);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ return lfs_dir_commit(lfs, &cwd, LFS_MKATTRS(
|
|
|
+ {LFS_MKTAG(LFS_TYPE_USERATTR + type, id, size), buffer}));
|
|
|
+}
|
|
|
+
|
|
|
+int lfs_setattr(lfs_t *lfs, const char *path,
|
|
|
+ uint8_t type, const void *buffer, lfs_size_t size) {
|
|
|
+ LFS_TRACE("lfs_setattr(%p, \"%s\", %"PRIu8", %p, %"PRIu32")",
|
|
|
+ (void*)lfs, path, type, buffer, size);
|
|
|
+ if (size > lfs->attr_max) {
|
|
|
+ LFS_TRACE("lfs_setattr -> %d", LFS_ERR_NOSPC);
|
|
|
+ return LFS_ERR_NOSPC;
|
|
|
+ }
|
|
|
+
|
|
|
+ int err = lfs_commitattr(lfs, path, type, buffer, size);
|
|
|
+ LFS_TRACE("lfs_setattr -> %d", err);
|
|
|
+ return err;
|
|
|
+}
|
|
|
+
|
|
|
+int lfs_removeattr(lfs_t *lfs, const char *path, uint8_t type) {
|
|
|
+ LFS_TRACE("lfs_removeattr(%p, \"%s\", %"PRIu8")", (void*)lfs, path, type);
|
|
|
+ int err = lfs_commitattr(lfs, path, type, NULL, 0x3ff);
|
|
|
+ LFS_TRACE("lfs_removeattr -> %d", err);
|
|
|
+ return err;
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+/// Filesystem operations ///
|
|
|
+static int lfs_init(lfs_t *lfs, const struct lfs_config *cfg) {
|
|
|
+ lfs->cfg = cfg;
|
|
|
+ int err = 0;
|
|
|
+
|
|
|
+ // validate that the lfs-cfg sizes were initiated properly before
|
|
|
+ // performing any arithmetic logics with them
|
|
|
+ LFS_ASSERT(lfs->cfg->read_size != 0);
|
|
|
+ LFS_ASSERT(lfs->cfg->prog_size != 0);
|
|
|
+ LFS_ASSERT(lfs->cfg->cache_size != 0);
|
|
|
+
|
|
|
+ // check that block size is a multiple of cache size is a multiple
|
|
|
+ // of prog and read sizes
|
|
|
+ LFS_ASSERT(lfs->cfg->cache_size % lfs->cfg->read_size == 0);
|
|
|
+ LFS_ASSERT(lfs->cfg->cache_size % lfs->cfg->prog_size == 0);
|
|
|
+ LFS_ASSERT(lfs->cfg->block_size % lfs->cfg->cache_size == 0);
|
|
|
+
|
|
|
+ // check that the block size is large enough to fit ctz pointers
|
|
|
+ LFS_ASSERT(4*lfs_npw2(LFS_BLOCK_NULL / (lfs->cfg->block_size-2*4))
|
|
|
+ <= lfs->cfg->block_size);
|
|
|
+
|
|
|
+ // block_cycles = 0 is no longer supported.
|
|
|
+ //
|
|
|
+ // block_cycles is the number of erase cycles before littlefs evicts
|
|
|
+ // metadata logs as a part of wear leveling. Suggested values are in the
|
|
|
+ // range of 100-1000, or set block_cycles to -1 to disable block-level
|
|
|
+ // wear-leveling.
|
|
|
+ LFS_ASSERT(lfs->cfg->block_cycles != 0);
|
|
|
+
|
|
|
+
|
|
|
+ // setup read cache
|
|
|
+ if (lfs->cfg->read_buffer) {
|
|
|
+ lfs->rcache.buffer = lfs->cfg->read_buffer;
|
|
|
+ } else {
|
|
|
+ lfs->rcache.buffer = lfs_malloc(lfs->cfg->cache_size);
|
|
|
+ if (!lfs->rcache.buffer) {
|
|
|
+ err = LFS_ERR_NOMEM;
|
|
|
+ goto cleanup;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // setup program cache
|
|
|
+ if (lfs->cfg->prog_buffer) {
|
|
|
+ lfs->pcache.buffer = lfs->cfg->prog_buffer;
|
|
|
+ } else {
|
|
|
+ lfs->pcache.buffer = lfs_malloc(lfs->cfg->cache_size);
|
|
|
+ if (!lfs->pcache.buffer) {
|
|
|
+ err = LFS_ERR_NOMEM;
|
|
|
+ goto cleanup;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // zero to avoid information leaks
|
|
|
+ lfs_cache_zero(lfs, &lfs->rcache);
|
|
|
+ lfs_cache_zero(lfs, &lfs->pcache);
|
|
|
+
|
|
|
+ // setup lookahead, must be multiple of 64-bits, 32-bit aligned
|
|
|
+ LFS_ASSERT(lfs->cfg->lookahead_size > 0);
|
|
|
+ LFS_ASSERT(lfs->cfg->lookahead_size % 8 == 0 &&
|
|
|
+ (uintptr_t)lfs->cfg->lookahead_buffer % 4 == 0);
|
|
|
+ if (lfs->cfg->lookahead_buffer) {
|
|
|
+ lfs->free.buffer = lfs->cfg->lookahead_buffer;
|
|
|
+ } else {
|
|
|
+ lfs->free.buffer = lfs_malloc(lfs->cfg->lookahead_size);
|
|
|
+ if (!lfs->free.buffer) {
|
|
|
+ err = LFS_ERR_NOMEM;
|
|
|
+ goto cleanup;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // check that the size limits are sane
|
|
|
+ LFS_ASSERT(lfs->cfg->name_max <= LFS_NAME_MAX);
|
|
|
+ lfs->name_max = lfs->cfg->name_max;
|
|
|
+ if (!lfs->name_max) {
|
|
|
+ lfs->name_max = LFS_NAME_MAX;
|
|
|
+ }
|
|
|
+
|
|
|
+ LFS_ASSERT(lfs->cfg->file_max <= LFS_FILE_MAX);
|
|
|
+ lfs->file_max = lfs->cfg->file_max;
|
|
|
+ if (!lfs->file_max) {
|
|
|
+ lfs->file_max = LFS_FILE_MAX;
|
|
|
+ }
|
|
|
+
|
|
|
+ LFS_ASSERT(lfs->cfg->attr_max <= LFS_ATTR_MAX);
|
|
|
+ lfs->attr_max = lfs->cfg->attr_max;
|
|
|
+ if (!lfs->attr_max) {
|
|
|
+ lfs->attr_max = LFS_ATTR_MAX;
|
|
|
+ }
|
|
|
+
|
|
|
+ // setup default state
|
|
|
+ lfs->root[0] = LFS_BLOCK_NULL;
|
|
|
+ lfs->root[1] = LFS_BLOCK_NULL;
|
|
|
+ lfs->mlist = NULL;
|
|
|
+ lfs->seed = 0;
|
|
|
+ lfs->gstate = (struct lfs_gstate){0};
|
|
|
+ lfs->gpending = (struct lfs_gstate){0};
|
|
|
+ lfs->gdelta = (struct lfs_gstate){0};
|
|
|
+#ifdef LFS_MIGRATE
|
|
|
+ lfs->lfs1 = NULL;
|
|
|
+#endif
|
|
|
+
|
|
|
+ return 0;
|
|
|
+
|
|
|
+cleanup:
|
|
|
+ lfs_deinit(lfs);
|
|
|
+ return err;
|
|
|
+}
|
|
|
+
|
|
|
+static int lfs_deinit(lfs_t *lfs) {
|
|
|
+ // free allocated memory
|
|
|
+ if (!lfs->cfg->read_buffer) {
|
|
|
+ lfs_free(lfs->rcache.buffer);
|
|
|
+ }
|
|
|
+
|
|
|
+ if (!lfs->cfg->prog_buffer) {
|
|
|
+ lfs_free(lfs->pcache.buffer);
|
|
|
+ }
|
|
|
+
|
|
|
+ if (!lfs->cfg->lookahead_buffer) {
|
|
|
+ lfs_free(lfs->free.buffer);
|
|
|
+ }
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+int lfs_format(lfs_t *lfs, const struct lfs_config *cfg) {
|
|
|
+ LFS_TRACE("lfs_format(%p, %p {.context=%p, "
|
|
|
+ ".read=%p, .prog=%p, .erase=%p, .sync=%p, "
|
|
|
+ ".read_size=%"PRIu32", .prog_size=%"PRIu32", "
|
|
|
+ ".block_size=%"PRIu32", .block_count=%"PRIu32", "
|
|
|
+ ".block_cycles=%"PRIu32", .cache_size=%"PRIu32", "
|
|
|
+ ".lookahead_size=%"PRIu32", .read_buffer=%p, "
|
|
|
+ ".prog_buffer=%p, .lookahead_buffer=%p, "
|
|
|
+ ".name_max=%"PRIu32", .file_max=%"PRIu32", "
|
|
|
+ ".attr_max=%"PRIu32"})",
|
|
|
+ (void*)lfs, (void*)cfg, cfg->context,
|
|
|
+ (void*)(uintptr_t)cfg->read, (void*)(uintptr_t)cfg->prog,
|
|
|
+ (void*)(uintptr_t)cfg->erase, (void*)(uintptr_t)cfg->sync,
|
|
|
+ cfg->read_size, cfg->prog_size, cfg->block_size, cfg->block_count,
|
|
|
+ cfg->block_cycles, cfg->cache_size, cfg->lookahead_size,
|
|
|
+ cfg->read_buffer, cfg->prog_buffer, cfg->lookahead_buffer,
|
|
|
+ cfg->name_max, cfg->file_max, cfg->attr_max);
|
|
|
+ int err = 0;
|
|
|
+ {
|
|
|
+ err = lfs_init(lfs, cfg);
|
|
|
+ if (err) {
|
|
|
+ LFS_TRACE("lfs_format -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ // create free lookahead
|
|
|
+ memset(lfs->free.buffer, 0, lfs->cfg->lookahead_size);
|
|
|
+ lfs->free.off = 0;
|
|
|
+ lfs->free.size = lfs_min(8*lfs->cfg->lookahead_size,
|
|
|
+ lfs->cfg->block_count);
|
|
|
+ lfs->free.i = 0;
|
|
|
+ lfs_alloc_ack(lfs);
|
|
|
+
|
|
|
+ // create root dir
|
|
|
+ lfs_mdir_t root;
|
|
|
+ err = lfs_dir_alloc(lfs, &root);
|
|
|
+ if (err) {
|
|
|
+ goto cleanup;
|
|
|
+ }
|
|
|
+
|
|
|
+ // write one superblock
|
|
|
+ lfs_superblock_t superblock = {
|
|
|
+ .version = LFS_DISK_VERSION,
|
|
|
+ .block_size = lfs->cfg->block_size,
|
|
|
+ .block_count = lfs->cfg->block_count,
|
|
|
+ .name_max = lfs->name_max,
|
|
|
+ .file_max = lfs->file_max,
|
|
|
+ .attr_max = lfs->attr_max,
|
|
|
+ };
|
|
|
+
|
|
|
+ lfs_superblock_tole32(&superblock);
|
|
|
+ err = lfs_dir_commit(lfs, &root, LFS_MKATTRS(
|
|
|
+ {LFS_MKTAG(LFS_TYPE_CREATE, 0, 0), NULL},
|
|
|
+ {LFS_MKTAG(LFS_TYPE_SUPERBLOCK, 0, 8), "littlefs"},
|
|
|
+ {LFS_MKTAG(LFS_TYPE_INLINESTRUCT, 0, sizeof(superblock)),
|
|
|
+ &superblock}));
|
|
|
+ if (err) {
|
|
|
+ goto cleanup;
|
|
|
+ }
|
|
|
+
|
|
|
+ // sanity check that fetch works
|
|
|
+ err = lfs_dir_fetch(lfs, &root, (const lfs_block_t[2]){0, 1});
|
|
|
+ if (err) {
|
|
|
+ goto cleanup;
|
|
|
+ }
|
|
|
+
|
|
|
+ // force compaction to prevent accidentally mounting any
|
|
|
+ // older version of littlefs that may live on disk
|
|
|
+ root.erased = false;
|
|
|
+ err = lfs_dir_commit(lfs, &root, NULL, 0);
|
|
|
+ if (err) {
|
|
|
+ goto cleanup;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+cleanup:
|
|
|
+ lfs_deinit(lfs);
|
|
|
+ LFS_TRACE("lfs_format -> %d", err);
|
|
|
+ return err;
|
|
|
+}
|
|
|
+
|
|
|
+int lfs_mount(lfs_t *lfs, const struct lfs_config *cfg) {
|
|
|
+ LFS_TRACE("lfs_mount(%p, %p {.context=%p, "
|
|
|
+ ".read=%p, .prog=%p, .erase=%p, .sync=%p, "
|
|
|
+ ".read_size=%"PRIu32", .prog_size=%"PRIu32", "
|
|
|
+ ".block_size=%"PRIu32", .block_count=%"PRIu32", "
|
|
|
+ ".block_cycles=%"PRIu32", .cache_size=%"PRIu32", "
|
|
|
+ ".lookahead_size=%"PRIu32", .read_buffer=%p, "
|
|
|
+ ".prog_buffer=%p, .lookahead_buffer=%p, "
|
|
|
+ ".name_max=%"PRIu32", .file_max=%"PRIu32", "
|
|
|
+ ".attr_max=%"PRIu32"})",
|
|
|
+ (void*)lfs, (void*)cfg, cfg->context,
|
|
|
+ (void*)(uintptr_t)cfg->read, (void*)(uintptr_t)cfg->prog,
|
|
|
+ (void*)(uintptr_t)cfg->erase, (void*)(uintptr_t)cfg->sync,
|
|
|
+ cfg->read_size, cfg->prog_size, cfg->block_size, cfg->block_count,
|
|
|
+ cfg->block_cycles, cfg->cache_size, cfg->lookahead_size,
|
|
|
+ cfg->read_buffer, cfg->prog_buffer, cfg->lookahead_buffer,
|
|
|
+ cfg->name_max, cfg->file_max, cfg->attr_max);
|
|
|
+ int err = lfs_init(lfs, cfg);
|
|
|
+ if (err) {
|
|
|
+ LFS_TRACE("lfs_mount -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ // scan directory blocks for superblock and any global updates
|
|
|
+ lfs_mdir_t dir = {.tail = {0, 1}};
|
|
|
+ while (!lfs_pair_isnull(dir.tail)) {
|
|
|
+ // fetch next block in tail list
|
|
|
+ lfs_stag_t tag = lfs_dir_fetchmatch(lfs, &dir, dir.tail,
|
|
|
+ LFS_MKTAG(0x7ff, 0x3ff, 0),
|
|
|
+ LFS_MKTAG(LFS_TYPE_SUPERBLOCK, 0, 8),
|
|
|
+ NULL,
|
|
|
+ lfs_dir_find_match, &(struct lfs_dir_find_match){
|
|
|
+ lfs, "littlefs", 8});
|
|
|
+ if (tag < 0) {
|
|
|
+ err = tag;
|
|
|
+ goto cleanup;
|
|
|
+ }
|
|
|
+
|
|
|
+ // has superblock?
|
|
|
+ if (tag && !lfs_tag_isdelete(tag)) {
|
|
|
+ // update root
|
|
|
+ lfs->root[0] = dir.pair[0];
|
|
|
+ lfs->root[1] = dir.pair[1];
|
|
|
+
|
|
|
+ // grab superblock
|
|
|
+ lfs_superblock_t superblock;
|
|
|
+ tag = lfs_dir_get(lfs, &dir, LFS_MKTAG(0x7ff, 0x3ff, 0),
|
|
|
+ LFS_MKTAG(LFS_TYPE_INLINESTRUCT, 0, sizeof(superblock)),
|
|
|
+ &superblock);
|
|
|
+ if (tag < 0) {
|
|
|
+ err = tag;
|
|
|
+ goto cleanup;
|
|
|
+ }
|
|
|
+ lfs_superblock_fromle32(&superblock);
|
|
|
+
|
|
|
+ // check version
|
|
|
+ uint16_t major_version = (0xffff & (superblock.version >> 16));
|
|
|
+ uint16_t minor_version = (0xffff & (superblock.version >> 0));
|
|
|
+ if ((major_version != LFS_DISK_VERSION_MAJOR ||
|
|
|
+ minor_version > LFS_DISK_VERSION_MINOR)) {
|
|
|
+ LFS_ERROR("Invalid version %"PRIu16".%"PRIu16,
|
|
|
+ major_version, minor_version);
|
|
|
+ err = LFS_ERR_INVAL;
|
|
|
+ goto cleanup;
|
|
|
+ }
|
|
|
+
|
|
|
+ // check superblock configuration
|
|
|
+ if (superblock.name_max) {
|
|
|
+ if (superblock.name_max > lfs->name_max) {
|
|
|
+ LFS_ERROR("Unsupported name_max (%"PRIu32" > %"PRIu32")",
|
|
|
+ superblock.name_max, lfs->name_max);
|
|
|
+ err = LFS_ERR_INVAL;
|
|
|
+ goto cleanup;
|
|
|
+ }
|
|
|
+
|
|
|
+ lfs->name_max = superblock.name_max;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (superblock.file_max) {
|
|
|
+ if (superblock.file_max > lfs->file_max) {
|
|
|
+ LFS_ERROR("Unsupported file_max (%"PRIu32" > %"PRIu32")",
|
|
|
+ superblock.file_max, lfs->file_max);
|
|
|
+ err = LFS_ERR_INVAL;
|
|
|
+ goto cleanup;
|
|
|
+ }
|
|
|
+
|
|
|
+ lfs->file_max = superblock.file_max;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (superblock.attr_max) {
|
|
|
+ if (superblock.attr_max > lfs->attr_max) {
|
|
|
+ LFS_ERROR("Unsupported attr_max (%"PRIu32" > %"PRIu32")",
|
|
|
+ superblock.attr_max, lfs->attr_max);
|
|
|
+ err = LFS_ERR_INVAL;
|
|
|
+ goto cleanup;
|
|
|
+ }
|
|
|
+
|
|
|
+ lfs->attr_max = superblock.attr_max;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // has gstate?
|
|
|
+ err = lfs_dir_getgstate(lfs, &dir, &lfs->gpending);
|
|
|
+ if (err) {
|
|
|
+ goto cleanup;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // found superblock?
|
|
|
+ if (lfs_pair_isnull(lfs->root)) {
|
|
|
+ err = LFS_ERR_INVAL;
|
|
|
+ goto cleanup;
|
|
|
+ }
|
|
|
+
|
|
|
+ // update littlefs with gstate
|
|
|
+ lfs->gpending.tag += !lfs_tag_isvalid(lfs->gpending.tag);
|
|
|
+ lfs->gstate = lfs->gpending;
|
|
|
+ if (lfs_gstate_hasmove(&lfs->gstate)) {
|
|
|
+ LFS_DEBUG("Found move %"PRIx32" %"PRIx32" %"PRIx16,
|
|
|
+ lfs->gstate.pair[0],
|
|
|
+ lfs->gstate.pair[1],
|
|
|
+ lfs_tag_id(lfs->gstate.tag));
|
|
|
+ }
|
|
|
+
|
|
|
+ // setup free lookahead
|
|
|
+ lfs->free.off = lfs->seed % lfs->cfg->block_size;
|
|
|
+ lfs->free.size = 0;
|
|
|
+ lfs->free.i = 0;
|
|
|
+ lfs_alloc_ack(lfs);
|
|
|
+
|
|
|
+ LFS_TRACE("lfs_mount -> %d", 0);
|
|
|
+ return 0;
|
|
|
+
|
|
|
+cleanup:
|
|
|
+ lfs_unmount(lfs);
|
|
|
+ LFS_TRACE("lfs_mount -> %d", err);
|
|
|
+ return err;
|
|
|
+}
|
|
|
+
|
|
|
+int lfs_unmount(lfs_t *lfs) {
|
|
|
+ LFS_TRACE("lfs_unmount(%p)", (void*)lfs);
|
|
|
+ int err = lfs_deinit(lfs);
|
|
|
+ LFS_TRACE("lfs_unmount -> %d", err);
|
|
|
+ return err;
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+/// Filesystem filesystem operations ///
|
|
|
+int lfs_fs_traverse(lfs_t *lfs,
|
|
|
+ int (*cb)(void *data, lfs_block_t block), void *data) {
|
|
|
+ LFS_TRACE("lfs_fs_traverse(%p, %p, %p)",
|
|
|
+ (void*)lfs, (void*)(uintptr_t)cb, data);
|
|
|
+ // iterate over metadata pairs
|
|
|
+ lfs_mdir_t dir = {.tail = {0, 1}};
|
|
|
+
|
|
|
+#ifdef LFS_MIGRATE
|
|
|
+ // also consider v1 blocks during migration
|
|
|
+ if (lfs->lfs1) {
|
|
|
+ int err = lfs1_traverse(lfs, cb, data);
|
|
|
+ if (err) {
|
|
|
+ LFS_TRACE("lfs_fs_traverse -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ dir.tail[0] = lfs->root[0];
|
|
|
+ dir.tail[1] = lfs->root[1];
|
|
|
+ }
|
|
|
+#endif
|
|
|
+
|
|
|
+ while (!lfs_pair_isnull(dir.tail)) {
|
|
|
+ for (int i = 0; i < 2; i++) {
|
|
|
+ int err = cb(data, dir.tail[i]);
|
|
|
+ if (err) {
|
|
|
+ LFS_TRACE("lfs_fs_traverse -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // iterate through ids in directory
|
|
|
+ int err = lfs_dir_fetch(lfs, &dir, dir.tail);
|
|
|
+ if (err) {
|
|
|
+ LFS_TRACE("lfs_fs_traverse -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ for (uint16_t id = 0; id < dir.count; id++) {
|
|
|
+ struct lfs_ctz ctz;
|
|
|
+ lfs_stag_t tag = lfs_dir_get(lfs, &dir, LFS_MKTAG(0x700, 0x3ff, 0),
|
|
|
+ LFS_MKTAG(LFS_TYPE_STRUCT, id, sizeof(ctz)), &ctz);
|
|
|
+ if (tag < 0) {
|
|
|
+ if (tag == LFS_ERR_NOENT) {
|
|
|
+ continue;
|
|
|
+ }
|
|
|
+ LFS_TRACE("lfs_fs_traverse -> %"PRId32, tag);
|
|
|
+ return tag;
|
|
|
+ }
|
|
|
+ lfs_ctz_fromle32(&ctz);
|
|
|
+
|
|
|
+ if (lfs_tag_type3(tag) == LFS_TYPE_CTZSTRUCT) {
|
|
|
+ err = lfs_ctz_traverse(lfs, NULL, &lfs->rcache,
|
|
|
+ ctz.head, ctz.size, cb, data);
|
|
|
+ if (err) {
|
|
|
+ LFS_TRACE("lfs_fs_traverse -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // iterate over any open files
|
|
|
+ for (lfs_file_t *f = (lfs_file_t*)lfs->mlist; f; f = f->next) {
|
|
|
+ if (f->type != LFS_TYPE_REG) {
|
|
|
+ continue;
|
|
|
+ }
|
|
|
+
|
|
|
+ if ((f->flags & LFS_F_DIRTY) && !(f->flags & LFS_F_INLINE)) {
|
|
|
+ int err = lfs_ctz_traverse(lfs, &f->cache, &lfs->rcache,
|
|
|
+ f->ctz.head, f->ctz.size, cb, data);
|
|
|
+ if (err) {
|
|
|
+ LFS_TRACE("lfs_fs_traverse -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ if ((f->flags & LFS_F_WRITING) && !(f->flags & LFS_F_INLINE)) {
|
|
|
+ int err = lfs_ctz_traverse(lfs, &f->cache, &lfs->rcache,
|
|
|
+ f->block, f->pos, cb, data);
|
|
|
+ if (err) {
|
|
|
+ LFS_TRACE("lfs_fs_traverse -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ LFS_TRACE("lfs_fs_traverse -> %d", 0);
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static int lfs_fs_pred(lfs_t *lfs,
|
|
|
+ const lfs_block_t pair[2], lfs_mdir_t *pdir) {
|
|
|
+ // iterate over all directory directory entries
|
|
|
+ pdir->tail[0] = 0;
|
|
|
+ pdir->tail[1] = 1;
|
|
|
+ while (!lfs_pair_isnull(pdir->tail)) {
|
|
|
+ if (lfs_pair_cmp(pdir->tail, pair) == 0) {
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+
|
|
|
+ int err = lfs_dir_fetch(lfs, pdir, pdir->tail);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ return LFS_ERR_NOENT;
|
|
|
+}
|
|
|
+
|
|
|
+struct lfs_fs_parent_match {
|
|
|
+ lfs_t *lfs;
|
|
|
+ const lfs_block_t pair[2];
|
|
|
+};
|
|
|
+
|
|
|
+static int lfs_fs_parent_match(void *data,
|
|
|
+ lfs_tag_t tag, const void *buffer) {
|
|
|
+ struct lfs_fs_parent_match *find = data;
|
|
|
+ lfs_t *lfs = find->lfs;
|
|
|
+ const struct lfs_diskoff *disk = buffer;
|
|
|
+ (void)tag;
|
|
|
+
|
|
|
+ lfs_block_t child[2];
|
|
|
+ int err = lfs_bd_read(lfs,
|
|
|
+ &lfs->pcache, &lfs->rcache, lfs->cfg->block_size,
|
|
|
+ disk->block, disk->off, &child, sizeof(child));
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ lfs_pair_fromle32(child);
|
|
|
+ return (lfs_pair_cmp(child, find->pair) == 0) ? LFS_CMP_EQ : LFS_CMP_LT;
|
|
|
+}
|
|
|
+
|
|
|
+static lfs_stag_t lfs_fs_parent(lfs_t *lfs, const lfs_block_t pair[2],
|
|
|
+ lfs_mdir_t *parent) {
|
|
|
+ // use fetchmatch with callback to find pairs
|
|
|
+ parent->tail[0] = 0;
|
|
|
+ parent->tail[1] = 1;
|
|
|
+ while (!lfs_pair_isnull(parent->tail)) {
|
|
|
+ lfs_stag_t tag = lfs_dir_fetchmatch(lfs, parent, parent->tail,
|
|
|
+ LFS_MKTAG(0x7ff, 0, 0x3ff),
|
|
|
+ LFS_MKTAG(LFS_TYPE_DIRSTRUCT, 0, 8),
|
|
|
+ NULL,
|
|
|
+ lfs_fs_parent_match, &(struct lfs_fs_parent_match){
|
|
|
+ lfs, {pair[0], pair[1]}});
|
|
|
+ if (tag && tag != LFS_ERR_NOENT) {
|
|
|
+ return tag;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ return LFS_ERR_NOENT;
|
|
|
+}
|
|
|
+
|
|
|
+static int lfs_fs_relocate(lfs_t *lfs,
|
|
|
+ const lfs_block_t oldpair[2], lfs_block_t newpair[2]) {
|
|
|
+ // update internal root
|
|
|
+ if (lfs_pair_cmp(oldpair, lfs->root) == 0) {
|
|
|
+ LFS_DEBUG("Relocating root %"PRIx32" %"PRIx32,
|
|
|
+ newpair[0], newpair[1]);
|
|
|
+ lfs->root[0] = newpair[0];
|
|
|
+ lfs->root[1] = newpair[1];
|
|
|
+ }
|
|
|
+
|
|
|
+ // update internally tracked dirs
|
|
|
+ for (struct lfs_mlist *d = lfs->mlist; d; d = d->next) {
|
|
|
+ if (lfs_pair_cmp(oldpair, d->m.pair) == 0) {
|
|
|
+ d->m.pair[0] = newpair[0];
|
|
|
+ d->m.pair[1] = newpair[1];
|
|
|
+ }
|
|
|
+
|
|
|
+ if (d->type == LFS_TYPE_DIR &&
|
|
|
+ lfs_pair_cmp(oldpair, ((lfs_dir_t*)d)->head) == 0) {
|
|
|
+ ((lfs_dir_t*)d)->head[0] = newpair[0];
|
|
|
+ ((lfs_dir_t*)d)->head[1] = newpair[1];
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // find parent
|
|
|
+ lfs_mdir_t parent;
|
|
|
+ lfs_stag_t tag = lfs_fs_parent(lfs, oldpair, &parent);
|
|
|
+ if (tag < 0 && tag != LFS_ERR_NOENT) {
|
|
|
+ return tag;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (tag != LFS_ERR_NOENT) {
|
|
|
+ // update disk, this creates a desync
|
|
|
+ lfs_fs_preporphans(lfs, +1);
|
|
|
+
|
|
|
+ lfs_pair_tole32(newpair);
|
|
|
+ int err = lfs_dir_commit(lfs, &parent, LFS_MKATTRS({tag, newpair}));
|
|
|
+ lfs_pair_fromle32(newpair);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ // next step, clean up orphans
|
|
|
+ lfs_fs_preporphans(lfs, -1);
|
|
|
+ }
|
|
|
+
|
|
|
+ // find pred
|
|
|
+ int err = lfs_fs_pred(lfs, oldpair, &parent);
|
|
|
+ if (err && err != LFS_ERR_NOENT) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ // if we can't find dir, it must be new
|
|
|
+ if (err != LFS_ERR_NOENT) {
|
|
|
+ // replace bad pair, either we clean up desync, or no desync occured
|
|
|
+ lfs_pair_tole32(newpair);
|
|
|
+ err = lfs_dir_commit(lfs, &parent, LFS_MKATTRS(
|
|
|
+ {LFS_MKTAG(LFS_TYPE_TAIL + parent.split, 0x3ff, 8), newpair}));
|
|
|
+ lfs_pair_fromle32(newpair);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static void lfs_fs_preporphans(lfs_t *lfs, int8_t orphans) {
|
|
|
+ lfs->gpending.tag += orphans;
|
|
|
+ lfs_gstate_xororphans(&lfs->gdelta, &lfs->gpending,
|
|
|
+ lfs_gstate_hasorphans(&lfs->gpending));
|
|
|
+ lfs_gstate_xororphans(&lfs->gpending, &lfs->gpending,
|
|
|
+ lfs_gstate_hasorphans(&lfs->gpending));
|
|
|
+}
|
|
|
+
|
|
|
+static void lfs_fs_prepmove(lfs_t *lfs,
|
|
|
+ uint16_t id, const lfs_block_t pair[2]) {
|
|
|
+ lfs_gstate_xormove(&lfs->gdelta, &lfs->gpending, id, pair);
|
|
|
+ lfs_gstate_xormove(&lfs->gpending, &lfs->gpending, id, pair);
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+static int lfs_fs_demove(lfs_t *lfs) {
|
|
|
+ if (!lfs_gstate_hasmove(&lfs->gstate)) {
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+
|
|
|
+ // Fix bad moves
|
|
|
+ LFS_DEBUG("Fixing move %"PRIx32" %"PRIx32" %"PRIx16,
|
|
|
+ lfs->gstate.pair[0],
|
|
|
+ lfs->gstate.pair[1],
|
|
|
+ lfs_tag_id(lfs->gstate.tag));
|
|
|
+
|
|
|
+ // fetch and delete the moved entry
|
|
|
+ lfs_mdir_t movedir;
|
|
|
+ int err = lfs_dir_fetch(lfs, &movedir, lfs->gstate.pair);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ // rely on cancel logic inside commit
|
|
|
+ err = lfs_dir_commit(lfs, &movedir, NULL, 0);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static int lfs_fs_deorphan(lfs_t *lfs) {
|
|
|
+ if (!lfs_gstate_hasorphans(&lfs->gstate)) {
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+
|
|
|
+ // Fix any orphans
|
|
|
+ lfs_mdir_t pdir = {.split = true};
|
|
|
+ lfs_mdir_t dir = {.tail = {0, 1}};
|
|
|
+
|
|
|
+ // iterate over all directory directory entries
|
|
|
+ while (!lfs_pair_isnull(dir.tail)) {
|
|
|
+ int err = lfs_dir_fetch(lfs, &dir, dir.tail);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ // check head blocks for orphans
|
|
|
+ if (!pdir.split) {
|
|
|
+ // check if we have a parent
|
|
|
+ lfs_mdir_t parent;
|
|
|
+ lfs_stag_t tag = lfs_fs_parent(lfs, pdir.tail, &parent);
|
|
|
+ if (tag < 0 && tag != LFS_ERR_NOENT) {
|
|
|
+ return tag;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (tag == LFS_ERR_NOENT) {
|
|
|
+ // we are an orphan
|
|
|
+ LFS_DEBUG("Fixing orphan %"PRIx32" %"PRIx32,
|
|
|
+ pdir.tail[0], pdir.tail[1]);
|
|
|
+
|
|
|
+ err = lfs_dir_drop(lfs, &pdir, &dir);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ break;
|
|
|
+ }
|
|
|
+
|
|
|
+ lfs_block_t pair[2];
|
|
|
+ lfs_stag_t res = lfs_dir_get(lfs, &parent,
|
|
|
+ LFS_MKTAG(0x7ff, 0x3ff, 0), tag, pair);
|
|
|
+ if (res < 0) {
|
|
|
+ return res;
|
|
|
+ }
|
|
|
+ lfs_pair_fromle32(pair);
|
|
|
+
|
|
|
+ if (!lfs_pair_sync(pair, pdir.tail)) {
|
|
|
+ // we have desynced
|
|
|
+ LFS_DEBUG("Fixing half-orphan %"PRIx32" %"PRIx32,
|
|
|
+ pair[0], pair[1]);
|
|
|
+
|
|
|
+ lfs_pair_tole32(pair);
|
|
|
+ err = lfs_dir_commit(lfs, &pdir, LFS_MKATTRS(
|
|
|
+ {LFS_MKTAG(LFS_TYPE_SOFTTAIL, 0x3ff, 8), pair}));
|
|
|
+ lfs_pair_fromle32(pair);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ memcpy(&pdir, &dir, sizeof(pdir));
|
|
|
+ }
|
|
|
+
|
|
|
+ // mark orphans as fixed
|
|
|
+ lfs_fs_preporphans(lfs, -lfs_gstate_getorphans(&lfs->gstate));
|
|
|
+ lfs->gstate = lfs->gpending;
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static int lfs_fs_forceconsistency(lfs_t *lfs) {
|
|
|
+ int err = lfs_fs_demove(lfs);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ err = lfs_fs_deorphan(lfs);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static int lfs_fs_size_count(void *p, lfs_block_t block) {
|
|
|
+ (void)block;
|
|
|
+ lfs_size_t *size = p;
|
|
|
+ *size += 1;
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+lfs_ssize_t lfs_fs_size(lfs_t *lfs) {
|
|
|
+ LFS_TRACE("lfs_fs_size(%p)", (void*)lfs);
|
|
|
+ lfs_size_t size = 0;
|
|
|
+ int err = lfs_fs_traverse(lfs, lfs_fs_size_count, &size);
|
|
|
+ if (err) {
|
|
|
+ LFS_TRACE("lfs_fs_size -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ LFS_TRACE("lfs_fs_size -> %d", err);
|
|
|
+ return size;
|
|
|
+}
|
|
|
+
|
|
|
+#ifdef LFS_MIGRATE
|
|
|
+////// Migration from littelfs v1 below this //////
|
|
|
+
|
|
|
+/// Version info ///
|
|
|
+
|
|
|
+// Software library version
|
|
|
+// Major (top-nibble), incremented on backwards incompatible changes
|
|
|
+// Minor (bottom-nibble), incremented on feature additions
|
|
|
+#define LFS1_VERSION 0x00010007
|
|
|
+#define LFS1_VERSION_MAJOR (0xffff & (LFS1_VERSION >> 16))
|
|
|
+#define LFS1_VERSION_MINOR (0xffff & (LFS1_VERSION >> 0))
|
|
|
+
|
|
|
+// Version of On-disk data structures
|
|
|
+// Major (top-nibble), incremented on backwards incompatible changes
|
|
|
+// Minor (bottom-nibble), incremented on feature additions
|
|
|
+#define LFS1_DISK_VERSION 0x00010001
|
|
|
+#define LFS1_DISK_VERSION_MAJOR (0xffff & (LFS1_DISK_VERSION >> 16))
|
|
|
+#define LFS1_DISK_VERSION_MINOR (0xffff & (LFS1_DISK_VERSION >> 0))
|
|
|
+
|
|
|
+
|
|
|
+/// v1 Definitions ///
|
|
|
+
|
|
|
+// File types
|
|
|
+enum lfs1_type {
|
|
|
+ LFS1_TYPE_REG = 0x11,
|
|
|
+ LFS1_TYPE_DIR = 0x22,
|
|
|
+ LFS1_TYPE_SUPERBLOCK = 0x2e,
|
|
|
+};
|
|
|
+
|
|
|
+typedef struct lfs1 {
|
|
|
+ lfs_block_t root[2];
|
|
|
+} lfs1_t;
|
|
|
+
|
|
|
+typedef struct lfs1_entry {
|
|
|
+ lfs_off_t off;
|
|
|
+
|
|
|
+ struct lfs1_disk_entry {
|
|
|
+ uint8_t type;
|
|
|
+ uint8_t elen;
|
|
|
+ uint8_t alen;
|
|
|
+ uint8_t nlen;
|
|
|
+ union {
|
|
|
+ struct {
|
|
|
+ lfs_block_t head;
|
|
|
+ lfs_size_t size;
|
|
|
+ } file;
|
|
|
+ lfs_block_t dir[2];
|
|
|
+ } u;
|
|
|
+ } d;
|
|
|
+} lfs1_entry_t;
|
|
|
+
|
|
|
+typedef struct lfs1_dir {
|
|
|
+ struct lfs1_dir *next;
|
|
|
+ lfs_block_t pair[2];
|
|
|
+ lfs_off_t off;
|
|
|
+
|
|
|
+ lfs_block_t head[2];
|
|
|
+ lfs_off_t pos;
|
|
|
+
|
|
|
+ struct lfs1_disk_dir {
|
|
|
+ uint32_t rev;
|
|
|
+ lfs_size_t size;
|
|
|
+ lfs_block_t tail[2];
|
|
|
+ } d;
|
|
|
+} lfs1_dir_t;
|
|
|
+
|
|
|
+typedef struct lfs1_superblock {
|
|
|
+ lfs_off_t off;
|
|
|
+
|
|
|
+ struct lfs1_disk_superblock {
|
|
|
+ uint8_t type;
|
|
|
+ uint8_t elen;
|
|
|
+ uint8_t alen;
|
|
|
+ uint8_t nlen;
|
|
|
+ lfs_block_t root[2];
|
|
|
+ uint32_t block_size;
|
|
|
+ uint32_t block_count;
|
|
|
+ uint32_t version;
|
|
|
+ char magic[8];
|
|
|
+ } d;
|
|
|
+} lfs1_superblock_t;
|
|
|
+
|
|
|
+
|
|
|
+/// Low-level wrappers v1->v2 ///
|
|
|
+static void lfs1_crc(uint32_t *crc, const void *buffer, size_t size) {
|
|
|
+ *crc = lfs_crc(*crc, buffer, size);
|
|
|
+}
|
|
|
+
|
|
|
+static int lfs1_bd_read(lfs_t *lfs, lfs_block_t block,
|
|
|
+ lfs_off_t off, void *buffer, lfs_size_t size) {
|
|
|
+ // if we ever do more than writes to alternating pairs,
|
|
|
+ // this may need to consider pcache
|
|
|
+ return lfs_bd_read(lfs, &lfs->pcache, &lfs->rcache, size,
|
|
|
+ block, off, buffer, size);
|
|
|
+}
|
|
|
+
|
|
|
+static int lfs1_bd_crc(lfs_t *lfs, lfs_block_t block,
|
|
|
+ lfs_off_t off, lfs_size_t size, uint32_t *crc) {
|
|
|
+ for (lfs_off_t i = 0; i < size; i++) {
|
|
|
+ uint8_t c;
|
|
|
+ int err = lfs1_bd_read(lfs, block, off+i, &c, 1);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ lfs1_crc(crc, &c, 1);
|
|
|
+ }
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+/// Endian swapping functions ///
|
|
|
+static void lfs1_dir_fromle32(struct lfs1_disk_dir *d) {
|
|
|
+ d->rev = lfs_fromle32(d->rev);
|
|
|
+ d->size = lfs_fromle32(d->size);
|
|
|
+ d->tail[0] = lfs_fromle32(d->tail[0]);
|
|
|
+ d->tail[1] = lfs_fromle32(d->tail[1]);
|
|
|
+}
|
|
|
+
|
|
|
+static void lfs1_dir_tole32(struct lfs1_disk_dir *d) {
|
|
|
+ d->rev = lfs_tole32(d->rev);
|
|
|
+ d->size = lfs_tole32(d->size);
|
|
|
+ d->tail[0] = lfs_tole32(d->tail[0]);
|
|
|
+ d->tail[1] = lfs_tole32(d->tail[1]);
|
|
|
+}
|
|
|
+
|
|
|
+static void lfs1_entry_fromle32(struct lfs1_disk_entry *d) {
|
|
|
+ d->u.dir[0] = lfs_fromle32(d->u.dir[0]);
|
|
|
+ d->u.dir[1] = lfs_fromle32(d->u.dir[1]);
|
|
|
+}
|
|
|
+
|
|
|
+static void lfs1_entry_tole32(struct lfs1_disk_entry *d) {
|
|
|
+ d->u.dir[0] = lfs_tole32(d->u.dir[0]);
|
|
|
+ d->u.dir[1] = lfs_tole32(d->u.dir[1]);
|
|
|
+}
|
|
|
+
|
|
|
+static void lfs1_superblock_fromle32(struct lfs1_disk_superblock *d) {
|
|
|
+ d->root[0] = lfs_fromle32(d->root[0]);
|
|
|
+ d->root[1] = lfs_fromle32(d->root[1]);
|
|
|
+ d->block_size = lfs_fromle32(d->block_size);
|
|
|
+ d->block_count = lfs_fromle32(d->block_count);
|
|
|
+ d->version = lfs_fromle32(d->version);
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+///// Metadata pair and directory operations ///
|
|
|
+static inline lfs_size_t lfs1_entry_size(const lfs1_entry_t *entry) {
|
|
|
+ return 4 + entry->d.elen + entry->d.alen + entry->d.nlen;
|
|
|
+}
|
|
|
+
|
|
|
+static int lfs1_dir_fetch(lfs_t *lfs,
|
|
|
+ lfs1_dir_t *dir, const lfs_block_t pair[2]) {
|
|
|
+ // copy out pair, otherwise may be aliasing dir
|
|
|
+ const lfs_block_t tpair[2] = {pair[0], pair[1]};
|
|
|
+ bool valid = false;
|
|
|
+
|
|
|
+ // check both blocks for the most recent revision
|
|
|
+ for (int i = 0; i < 2; i++) {
|
|
|
+ struct lfs1_disk_dir test;
|
|
|
+ int err = lfs1_bd_read(lfs, tpair[i], 0, &test, sizeof(test));
|
|
|
+ lfs1_dir_fromle32(&test);
|
|
|
+ if (err) {
|
|
|
+ if (err == LFS_ERR_CORRUPT) {
|
|
|
+ continue;
|
|
|
+ }
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (valid && lfs_scmp(test.rev, dir->d.rev) < 0) {
|
|
|
+ continue;
|
|
|
+ }
|
|
|
+
|
|
|
+ if ((0x7fffffff & test.size) < sizeof(test)+4 ||
|
|
|
+ (0x7fffffff & test.size) > lfs->cfg->block_size) {
|
|
|
+ continue;
|
|
|
+ }
|
|
|
+
|
|
|
+ uint32_t crc = LFS_BLOCK_NULL;
|
|
|
+ lfs1_dir_tole32(&test);
|
|
|
+ lfs1_crc(&crc, &test, sizeof(test));
|
|
|
+ lfs1_dir_fromle32(&test);
|
|
|
+ err = lfs1_bd_crc(lfs, tpair[i], sizeof(test),
|
|
|
+ (0x7fffffff & test.size) - sizeof(test), &crc);
|
|
|
+ if (err) {
|
|
|
+ if (err == LFS_ERR_CORRUPT) {
|
|
|
+ continue;
|
|
|
+ }
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (crc != 0) {
|
|
|
+ continue;
|
|
|
+ }
|
|
|
+
|
|
|
+ valid = true;
|
|
|
+
|
|
|
+ // setup dir in case it's valid
|
|
|
+ dir->pair[0] = tpair[(i+0) % 2];
|
|
|
+ dir->pair[1] = tpair[(i+1) % 2];
|
|
|
+ dir->off = sizeof(dir->d);
|
|
|
+ dir->d = test;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (!valid) {
|
|
|
+ LFS_ERROR("Corrupted dir pair at %" PRIx32 " %" PRIx32 ,
|
|
|
+ tpair[0], tpair[1]);
|
|
|
+ return LFS_ERR_CORRUPT;
|
|
|
+ }
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static int lfs1_dir_next(lfs_t *lfs, lfs1_dir_t *dir, lfs1_entry_t *entry) {
|
|
|
+ while (dir->off + sizeof(entry->d) > (0x7fffffff & dir->d.size)-4) {
|
|
|
+ if (!(0x80000000 & dir->d.size)) {
|
|
|
+ entry->off = dir->off;
|
|
|
+ return LFS_ERR_NOENT;
|
|
|
+ }
|
|
|
+
|
|
|
+ int err = lfs1_dir_fetch(lfs, dir, dir->d.tail);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ dir->off = sizeof(dir->d);
|
|
|
+ dir->pos += sizeof(dir->d) + 4;
|
|
|
+ }
|
|
|
+
|
|
|
+ int err = lfs1_bd_read(lfs, dir->pair[0], dir->off,
|
|
|
+ &entry->d, sizeof(entry->d));
|
|
|
+ lfs1_entry_fromle32(&entry->d);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ entry->off = dir->off;
|
|
|
+ dir->off += lfs1_entry_size(entry);
|
|
|
+ dir->pos += lfs1_entry_size(entry);
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+/// littlefs v1 specific operations ///
|
|
|
+int lfs1_traverse(lfs_t *lfs, int (*cb)(void*, lfs_block_t), void *data) {
|
|
|
+ if (lfs_pair_isnull(lfs->lfs1->root)) {
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+
|
|
|
+ // iterate over metadata pairs
|
|
|
+ lfs1_dir_t dir;
|
|
|
+ lfs1_entry_t entry;
|
|
|
+ lfs_block_t cwd[2] = {0, 1};
|
|
|
+
|
|
|
+ while (true) {
|
|
|
+ for (int i = 0; i < 2; i++) {
|
|
|
+ int err = cb(data, cwd[i]);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ int err = lfs1_dir_fetch(lfs, &dir, cwd);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ // iterate over contents
|
|
|
+ while (dir.off + sizeof(entry.d) <= (0x7fffffff & dir.d.size)-4) {
|
|
|
+ err = lfs1_bd_read(lfs, dir.pair[0], dir.off,
|
|
|
+ &entry.d, sizeof(entry.d));
|
|
|
+ lfs1_entry_fromle32(&entry.d);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ dir.off += lfs1_entry_size(&entry);
|
|
|
+ if ((0x70 & entry.d.type) == (0x70 & LFS1_TYPE_REG)) {
|
|
|
+ err = lfs_ctz_traverse(lfs, NULL, &lfs->rcache,
|
|
|
+ entry.d.u.file.head, entry.d.u.file.size, cb, data);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // we also need to check if we contain a threaded v2 directory
|
|
|
+ lfs_mdir_t dir2 = {.split=true, .tail={cwd[0], cwd[1]}};
|
|
|
+ while (dir2.split) {
|
|
|
+ err = lfs_dir_fetch(lfs, &dir2, dir2.tail);
|
|
|
+ if (err) {
|
|
|
+ break;
|
|
|
+ }
|
|
|
+
|
|
|
+ for (int i = 0; i < 2; i++) {
|
|
|
+ err = cb(data, dir2.pair[i]);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ cwd[0] = dir.d.tail[0];
|
|
|
+ cwd[1] = dir.d.tail[1];
|
|
|
+
|
|
|
+ if (lfs_pair_isnull(cwd)) {
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static int lfs1_moved(lfs_t *lfs, const void *e) {
|
|
|
+ if (lfs_pair_isnull(lfs->lfs1->root)) {
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+
|
|
|
+ // skip superblock
|
|
|
+ lfs1_dir_t cwd;
|
|
|
+ int err = lfs1_dir_fetch(lfs, &cwd, (const lfs_block_t[2]){0, 1});
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ // iterate over all directory directory entries
|
|
|
+ lfs1_entry_t entry;
|
|
|
+ while (!lfs_pair_isnull(cwd.d.tail)) {
|
|
|
+ err = lfs1_dir_fetch(lfs, &cwd, cwd.d.tail);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ while (true) {
|
|
|
+ err = lfs1_dir_next(lfs, &cwd, &entry);
|
|
|
+ if (err && err != LFS_ERR_NOENT) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (err == LFS_ERR_NOENT) {
|
|
|
+ break;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (!(0x80 & entry.d.type) &&
|
|
|
+ memcmp(&entry.d.u, e, sizeof(entry.d.u)) == 0) {
|
|
|
+ return true;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ return false;
|
|
|
+}
|
|
|
+
|
|
|
+/// Filesystem operations ///
|
|
|
+static int lfs1_mount(lfs_t *lfs, struct lfs1 *lfs1,
|
|
|
+ const struct lfs_config *cfg) {
|
|
|
+ int err = 0;
|
|
|
+ {
|
|
|
+ err = lfs_init(lfs, cfg);
|
|
|
+ if (err) {
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ lfs->lfs1 = lfs1;
|
|
|
+ lfs->lfs1->root[0] = LFS_BLOCK_NULL;
|
|
|
+ lfs->lfs1->root[1] = LFS_BLOCK_NULL;
|
|
|
+
|
|
|
+ // setup free lookahead
|
|
|
+ lfs->free.off = 0;
|
|
|
+ lfs->free.size = 0;
|
|
|
+ lfs->free.i = 0;
|
|
|
+ lfs_alloc_ack(lfs);
|
|
|
+
|
|
|
+ // load superblock
|
|
|
+ lfs1_dir_t dir;
|
|
|
+ lfs1_superblock_t superblock;
|
|
|
+ err = lfs1_dir_fetch(lfs, &dir, (const lfs_block_t[2]){0, 1});
|
|
|
+ if (err && err != LFS_ERR_CORRUPT) {
|
|
|
+ goto cleanup;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (!err) {
|
|
|
+ err = lfs1_bd_read(lfs, dir.pair[0], sizeof(dir.d),
|
|
|
+ &superblock.d, sizeof(superblock.d));
|
|
|
+ lfs1_superblock_fromle32(&superblock.d);
|
|
|
+ if (err) {
|
|
|
+ goto cleanup;
|
|
|
+ }
|
|
|
+
|
|
|
+ lfs->lfs1->root[0] = superblock.d.root[0];
|
|
|
+ lfs->lfs1->root[1] = superblock.d.root[1];
|
|
|
+ }
|
|
|
+
|
|
|
+ if (err || memcmp(superblock.d.magic, "littlefs", 8) != 0) {
|
|
|
+ LFS_ERROR("Invalid superblock at %d %d", 0, 1);
|
|
|
+ err = LFS_ERR_CORRUPT;
|
|
|
+ goto cleanup;
|
|
|
+ }
|
|
|
+
|
|
|
+ uint16_t major_version = (0xffff & (superblock.d.version >> 16));
|
|
|
+ uint16_t minor_version = (0xffff & (superblock.d.version >> 0));
|
|
|
+ if ((major_version != LFS1_DISK_VERSION_MAJOR ||
|
|
|
+ minor_version > LFS1_DISK_VERSION_MINOR)) {
|
|
|
+ LFS_ERROR("Invalid version %d.%d", major_version, minor_version);
|
|
|
+ err = LFS_ERR_INVAL;
|
|
|
+ goto cleanup;
|
|
|
+ }
|
|
|
+
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+
|
|
|
+cleanup:
|
|
|
+ lfs_deinit(lfs);
|
|
|
+ return err;
|
|
|
+}
|
|
|
+
|
|
|
+static int lfs1_unmount(lfs_t *lfs) {
|
|
|
+ return lfs_deinit(lfs);
|
|
|
+}
|
|
|
+
|
|
|
+/// v1 migration ///
|
|
|
+int lfs_migrate(lfs_t *lfs, const struct lfs_config *cfg) {
|
|
|
+ LFS_TRACE("lfs_migrate(%p, %p {.context=%p, "
|
|
|
+ ".read=%p, .prog=%p, .erase=%p, .sync=%p, "
|
|
|
+ ".read_size=%"PRIu32", .prog_size=%"PRIu32", "
|
|
|
+ ".block_size=%"PRIu32", .block_count=%"PRIu32", "
|
|
|
+ ".block_cycles=%"PRIu32", .cache_size=%"PRIu32", "
|
|
|
+ ".lookahead_size=%"PRIu32", .read_buffer=%p, "
|
|
|
+ ".prog_buffer=%p, .lookahead_buffer=%p, "
|
|
|
+ ".name_max=%"PRIu32", .file_max=%"PRIu32", "
|
|
|
+ ".attr_max=%"PRIu32"})",
|
|
|
+ (void*)lfs, (void*)cfg, cfg->context,
|
|
|
+ (void*)(uintptr_t)cfg->read, (void*)(uintptr_t)cfg->prog,
|
|
|
+ (void*)(uintptr_t)cfg->erase, (void*)(uintptr_t)cfg->sync,
|
|
|
+ cfg->read_size, cfg->prog_size, cfg->block_size, cfg->block_count,
|
|
|
+ cfg->block_cycles, cfg->cache_size, cfg->lookahead_size,
|
|
|
+ cfg->read_buffer, cfg->prog_buffer, cfg->lookahead_buffer,
|
|
|
+ cfg->name_max, cfg->file_max, cfg->attr_max);
|
|
|
+ struct lfs1 lfs1;
|
|
|
+ int err = lfs1_mount(lfs, &lfs1, cfg);
|
|
|
+ if (err) {
|
|
|
+ LFS_TRACE("lfs_migrate -> %d", err);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ {
|
|
|
+ // iterate through each directory, copying over entries
|
|
|
+ // into new directory
|
|
|
+ lfs1_dir_t dir1;
|
|
|
+ lfs_mdir_t dir2;
|
|
|
+ dir1.d.tail[0] = lfs->lfs1->root[0];
|
|
|
+ dir1.d.tail[1] = lfs->lfs1->root[1];
|
|
|
+ while (!lfs_pair_isnull(dir1.d.tail)) {
|
|
|
+ // iterate old dir
|
|
|
+ err = lfs1_dir_fetch(lfs, &dir1, dir1.d.tail);
|
|
|
+ if (err) {
|
|
|
+ goto cleanup;
|
|
|
+ }
|
|
|
+
|
|
|
+ // create new dir and bind as temporary pretend root
|
|
|
+ err = lfs_dir_alloc(lfs, &dir2);
|
|
|
+ if (err) {
|
|
|
+ goto cleanup;
|
|
|
+ }
|
|
|
+
|
|
|
+ dir2.rev = dir1.d.rev;
|
|
|
+ dir1.head[0] = dir1.pair[0];
|
|
|
+ dir1.head[1] = dir1.pair[1];
|
|
|
+ lfs->root[0] = dir2.pair[0];
|
|
|
+ lfs->root[1] = dir2.pair[1];
|
|
|
+
|
|
|
+ err = lfs_dir_commit(lfs, &dir2, NULL, 0);
|
|
|
+ if (err) {
|
|
|
+ goto cleanup;
|
|
|
+ }
|
|
|
+
|
|
|
+ while (true) {
|
|
|
+ lfs1_entry_t entry1;
|
|
|
+ err = lfs1_dir_next(lfs, &dir1, &entry1);
|
|
|
+ if (err && err != LFS_ERR_NOENT) {
|
|
|
+ goto cleanup;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (err == LFS_ERR_NOENT) {
|
|
|
+ break;
|
|
|
+ }
|
|
|
+
|
|
|
+ // check that entry has not been moved
|
|
|
+ if (entry1.d.type & 0x80) {
|
|
|
+ int moved = lfs1_moved(lfs, &entry1.d.u);
|
|
|
+ if (moved < 0) {
|
|
|
+ err = moved;
|
|
|
+ goto cleanup;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (moved) {
|
|
|
+ continue;
|
|
|
+ }
|
|
|
+
|
|
|
+ entry1.d.type &= ~0x80;
|
|
|
+ }
|
|
|
+
|
|
|
+ // also fetch name
|
|
|
+ char name[LFS_NAME_MAX+1];
|
|
|
+ memset(name, 0, sizeof(name));
|
|
|
+ err = lfs1_bd_read(lfs, dir1.pair[0],
|
|
|
+ entry1.off + 4+entry1.d.elen+entry1.d.alen,
|
|
|
+ name, entry1.d.nlen);
|
|
|
+ if (err) {
|
|
|
+ goto cleanup;
|
|
|
+ }
|
|
|
+
|
|
|
+ bool isdir = (entry1.d.type == LFS1_TYPE_DIR);
|
|
|
+
|
|
|
+ // create entry in new dir
|
|
|
+ err = lfs_dir_fetch(lfs, &dir2, lfs->root);
|
|
|
+ if (err) {
|
|
|
+ goto cleanup;
|
|
|
+ }
|
|
|
+
|
|
|
+ uint16_t id;
|
|
|
+ err = lfs_dir_find(lfs, &dir2, &(const char*){name}, &id);
|
|
|
+ if (!(err == LFS_ERR_NOENT && id != 0x3ff)) {
|
|
|
+ err = (err < 0) ? err : LFS_ERR_EXIST;
|
|
|
+ goto cleanup;
|
|
|
+ }
|
|
|
+
|
|
|
+ lfs1_entry_tole32(&entry1.d);
|
|
|
+ err = lfs_dir_commit(lfs, &dir2, LFS_MKATTRS(
|
|
|
+ {LFS_MKTAG(LFS_TYPE_CREATE, id, 0), NULL},
|
|
|
+ {LFS_MKTAG(
|
|
|
+ isdir ? LFS_TYPE_DIR : LFS_TYPE_REG,
|
|
|
+ id, entry1.d.nlen), name},
|
|
|
+ {LFS_MKTAG(
|
|
|
+ isdir ? LFS_TYPE_DIRSTRUCT : LFS_TYPE_CTZSTRUCT,
|
|
|
+ id, sizeof(entry1.d.u)), &entry1.d.u}));
|
|
|
+ lfs1_entry_fromle32(&entry1.d);
|
|
|
+ if (err) {
|
|
|
+ goto cleanup;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ if (!lfs_pair_isnull(dir1.d.tail)) {
|
|
|
+ // find last block and update tail to thread into fs
|
|
|
+ err = lfs_dir_fetch(lfs, &dir2, lfs->root);
|
|
|
+ if (err) {
|
|
|
+ goto cleanup;
|
|
|
+ }
|
|
|
+
|
|
|
+ while (dir2.split) {
|
|
|
+ err = lfs_dir_fetch(lfs, &dir2, dir2.tail);
|
|
|
+ if (err) {
|
|
|
+ goto cleanup;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ lfs_pair_tole32(dir2.pair);
|
|
|
+ err = lfs_dir_commit(lfs, &dir2, LFS_MKATTRS(
|
|
|
+ {LFS_MKTAG(LFS_TYPE_SOFTTAIL, 0x3ff, 8),
|
|
|
+ dir1.d.tail}));
|
|
|
+ lfs_pair_fromle32(dir2.pair);
|
|
|
+ if (err) {
|
|
|
+ goto cleanup;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // Copy over first block to thread into fs. Unfortunately
|
|
|
+ // if this fails there is not much we can do.
|
|
|
+ LFS_DEBUG("Migrating %"PRIx32" %"PRIx32" -> %"PRIx32" %"PRIx32,
|
|
|
+ lfs->root[0], lfs->root[1], dir1.head[0], dir1.head[1]);
|
|
|
+
|
|
|
+ err = lfs_bd_erase(lfs, dir1.head[1]);
|
|
|
+ if (err) {
|
|
|
+ goto cleanup;
|
|
|
+ }
|
|
|
+
|
|
|
+ err = lfs_dir_fetch(lfs, &dir2, lfs->root);
|
|
|
+ if (err) {
|
|
|
+ goto cleanup;
|
|
|
+ }
|
|
|
+
|
|
|
+ for (lfs_off_t i = 0; i < dir2.off; i++) {
|
|
|
+ uint8_t dat;
|
|
|
+ err = lfs_bd_read(lfs,
|
|
|
+ NULL, &lfs->rcache, dir2.off,
|
|
|
+ dir2.pair[0], i, &dat, 1);
|
|
|
+ if (err) {
|
|
|
+ goto cleanup;
|
|
|
+ }
|
|
|
+
|
|
|
+ err = lfs_bd_prog(lfs,
|
|
|
+ &lfs->pcache, &lfs->rcache, true,
|
|
|
+ dir1.head[1], i, &dat, 1);
|
|
|
+ if (err) {
|
|
|
+ goto cleanup;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ err = lfs_bd_flush(lfs, &lfs->pcache, &lfs->rcache, true);
|
|
|
+ if (err) {
|
|
|
+ goto cleanup;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // Create new superblock. This marks a successful migration!
|
|
|
+ err = lfs1_dir_fetch(lfs, &dir1, (const lfs_block_t[2]){0, 1});
|
|
|
+ if (err) {
|
|
|
+ goto cleanup;
|
|
|
+ }
|
|
|
+
|
|
|
+ dir2.pair[0] = dir1.pair[0];
|
|
|
+ dir2.pair[1] = dir1.pair[1];
|
|
|
+ dir2.rev = dir1.d.rev;
|
|
|
+ dir2.off = sizeof(dir2.rev);
|
|
|
+ dir2.etag = LFS_BLOCK_NULL;
|
|
|
+ dir2.count = 0;
|
|
|
+ dir2.tail[0] = lfs->lfs1->root[0];
|
|
|
+ dir2.tail[1] = lfs->lfs1->root[1];
|
|
|
+ dir2.erased = false;
|
|
|
+ dir2.split = true;
|
|
|
+
|
|
|
+ lfs_superblock_t superblock = {
|
|
|
+ .version = LFS_DISK_VERSION,
|
|
|
+ .block_size = lfs->cfg->block_size,
|
|
|
+ .block_count = lfs->cfg->block_count,
|
|
|
+ .name_max = lfs->name_max,
|
|
|
+ .file_max = lfs->file_max,
|
|
|
+ .attr_max = lfs->attr_max,
|
|
|
+ };
|
|
|
+
|
|
|
+ lfs_superblock_tole32(&superblock);
|
|
|
+ err = lfs_dir_commit(lfs, &dir2, LFS_MKATTRS(
|
|
|
+ {LFS_MKTAG(LFS_TYPE_CREATE, 0, 0), NULL},
|
|
|
+ {LFS_MKTAG(LFS_TYPE_SUPERBLOCK, 0, 8), "littlefs"},
|
|
|
+ {LFS_MKTAG(LFS_TYPE_INLINESTRUCT, 0, sizeof(superblock)),
|
|
|
+ &superblock}));
|
|
|
+ if (err) {
|
|
|
+ goto cleanup;
|
|
|
+ }
|
|
|
+
|
|
|
+ // sanity check that fetch works
|
|
|
+ err = lfs_dir_fetch(lfs, &dir2, (const lfs_block_t[2]){0, 1});
|
|
|
+ if (err) {
|
|
|
+ goto cleanup;
|
|
|
+ }
|
|
|
+
|
|
|
+ // force compaction to prevent accidentally mounting v1
|
|
|
+ dir2.erased = false;
|
|
|
+ err = lfs_dir_commit(lfs, &dir2, NULL, 0);
|
|
|
+ if (err) {
|
|
|
+ goto cleanup;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+cleanup:
|
|
|
+ lfs1_unmount(lfs);
|
|
|
+ LFS_TRACE("lfs_migrate -> %d", err);
|
|
|
+ return err;
|
|
|
+}
|
|
|
+
|
|
|
+#endif
|
Wendal Chen