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| author | Kent Overstreet <kent.overstreet@linux.dev> | 2025-04-03 14:19:23 -0400 |
|---|---|---|
| committer | Kent Overstreet <kent.overstreet@linux.dev> | 2025-05-21 20:14:20 -0400 |
| commit | 203852d9db68e14b50b119cbd123def7e7c9efd0 (patch) | |
| tree | 19b6ba7e726991d29d127291fc9313363cc1645a /fs/bcachefs/super.c | |
| parent | 576493133f26a172b8db4313448206d30750c9b2 (diff) | |
| download | linux-next-203852d9db68e14b50b119cbd123def7e7c9efd0.tar.gz linux-next-203852d9db68e14b50b119cbd123def7e7c9efd0.zip | |
bcachefs: BCH_FEATURE_no_alloc_info
If a filesystem is going to only be used read-only, and will be a
deployable image, we can strip out alloc info for a substantial
reduction in metadata size - around half, due to backpointers.
Alloc info will be regenerated on first read-write mount.
Remounting RW is disallowed for now, since we don't yet have
check_allocations running in RW mode.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
Diffstat (limited to 'fs/bcachefs/super.c')
| -rw-r--r-- | fs/bcachefs/super.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/bcachefs/super.c b/fs/bcachefs/super.c index 60e632e22b98..6ab3e63ef139 100644 --- a/fs/bcachefs/super.c +++ b/fs/bcachefs/super.c @@ -443,6 +443,9 @@ static int __bch2_fs_read_write(struct bch_fs *c, bool early) BUG_ON(!test_bit(BCH_FS_may_go_rw, &c->flags)); + if (WARN_ON(c->sb.features & BIT_ULL(BCH_FEATURE_no_alloc_info))) + return -BCH_ERR_erofs_no_alloc_info; + if (test_bit(BCH_FS_initial_gc_unfixed, &c->flags)) { bch_err(c, "cannot go rw, unfixed btree errors"); return -BCH_ERR_erofs_unfixed_errors; @@ -535,6 +538,9 @@ int bch2_fs_read_write(struct bch_fs *c) if (c->opts.nochanges) return -BCH_ERR_erofs_nochanges; + if (c->sb.features & BIT_ULL(BCH_FEATURE_no_alloc_info)) + return -BCH_ERR_erofs_no_alloc_info; + return __bch2_fs_read_write(c, false); } |