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Allowed mdir overcompaction if we run out of space

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This should allow mdir commits that would normally trigger a relocation
to continue if lfsr_mdir_alloc__ return LFS_ERR_NOSPC, though at least
with a logged warning.

This seems preferable to the alternative: locking up the filesystem.

Though this doesn't have tests yet, so take it with a grain of salt...

Code changes minimal:

           code          stack
  before: 33470           2640
  after:  33474 (+0.0%)   2640 (+0.0%)
This commit is contained in:
Christopher Haster
2024-05-24 02:15:12 -05:00
parent 09faac593c
commit 8a263fb6c5
1 changed files with 11 additions and 1 deletions
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lfs.c
+11 -1
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@@ -5931,7 +5931,17 @@ static int lfsr_mdir_swap__(lfs_t *lfs, lfsr_mdir_t *mdir_,
// decide if we need to relocate
if (!force && lfsr_rev_needsrelocation(lfs, rev)) {
// alloc a new mdir
return lfsr_mdir_alloc__(lfs, mdir_, mdir->mid);
err = lfsr_mdir_alloc__(lfs, mdir_, mdir->mid);
if (err != LFS_ERR_NOSPC) {
return err;
}
// no more blocks? wear-leveling falls apart here, but
// we can not relocate
LFS_WARN("Overcompacting mdir %"PRId32" "
"0x{%"PRIx32",%"PRIx32"}",
mdir->mid >> lfs->mdir_bits,
mdir->rbyd.blocks[0], mdir->rbyd.blocks[1]);
}
// swap our blocks