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Fixed corner case with immediate exhaustion and lookahead==block_count

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The previous math for determining if we scanned all of disk wasn't set
up correctly in the lfs_mount function. If lookahead == block_count
the lfs_alloc function would think we had already searched the entire
disk.

This is only an issue if we manage to exhaust a block on the first
pass after mount, since lfs_alloc_ack resets the lookahead region
into a valid state after a succesful block allocation.
This commit is contained in:
Christopher Haster
2017-11-09 19:28:55 -06:00
parent f4aeb8331a
commit 3f31c8cba3
1 changed files with 2 additions and 2 deletions
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4
lfs.c
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@@ -1922,7 +1922,7 @@ int lfs_format(lfs_t *lfs, const struct lfs_config *cfg) {
memset(lfs->free.buffer, 0, lfs->cfg->lookahead/8);
lfs->free.begin = 0;
lfs->free.off = 0;
lfs->free.end = lfs->free.begin + lfs->cfg->block_count;
lfs->free.end = lfs->free.begin + lfs->free.off + lfs->cfg->block_count;
// create superblock dir
lfs_alloc_ack(lfs);
@@ -2000,7 +2000,7 @@ int lfs_mount(lfs_t *lfs, const struct lfs_config *cfg) {
// setup free lookahead
lfs->free.begin = -lfs->cfg->lookahead;
lfs->free.off = lfs->cfg->lookahead;
lfs->free.end = lfs->free.begin + lfs->cfg->block_count;
lfs->free.end = lfs->free.begin + lfs->free.off + lfs->cfg->block_count;
// load superblock
lfs_dir_t dir;