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Stop wear-leveling during migration

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Stop 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.
This commit is contained in:
Christopher Haster
2019-11-26 13:59:45 -06:00
parent 73fd57b1e4
commit f42d28da24
1 changed files with 7 additions and 3 deletions
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10
lfs.c
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@@ -1503,9 +1503,13 @@ static int lfs_dir_compact(lfs_t *lfs,
}
}
#ifdef LFS_MIGRATE
} else if (lfs_pair_cmp(dir->pair, lfs->root) == 0 && lfs->lfs1) {
// we can't relocate our root during migrations, as this would
// cause the superblock to get updated, which would clobber v1
} 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