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| author | Kent Overstreet <kent.overstreet@linux.dev> | 2023-12-29 21:16:32 -0500 |
|---|---|---|
| committer | Kent Overstreet <kent.overstreet@linux.dev> | 2024-01-01 11:47:07 -0500 |
| commit | 0d72ab35a925d66b044cb62b709e53141c3f0143 (patch) | |
| tree | a0ef3340110dac004ec3ba1d1a2d7dfb1b9e7ce0 /fs/bcachefs/subvolume.c | |
| parent | 84f1638795da1ff2084597de4251e9054f1ad728 (diff) | |
| download | linux-0d72ab35a925d66b044cb62b709e53141c3f0143.tar.gz linux-0d72ab35a925d66b044cb62b709e53141c3f0143.tar.bz2 linux-0d72ab35a925d66b044cb62b709e53141c3f0143.zip | |
bcachefs: make RO snapshots actually RO
Add checks to all the VFS paths for "are we in a RO snapshot?".
Note - we don't check this when setting inode options via our xattr
interface, since those generally only affect data placement, not
contents of data.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
Reported-by: "Carl E. Thompson" <list-bcachefs@carlthompson.net>
Diffstat (limited to 'fs/bcachefs/subvolume.c')
| -rw-r--r-- | fs/bcachefs/subvolume.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/fs/bcachefs/subvolume.c b/fs/bcachefs/subvolume.c index fccd25aa3242..22b34a8e4d6e 100644 --- a/fs/bcachefs/subvolume.c +++ b/fs/bcachefs/subvolume.c @@ -146,6 +146,24 @@ int bch2_subvolume_get(struct btree_trans *trans, unsigned subvol, return bch2_subvolume_get_inlined(trans, subvol, inconsistent_if_not_found, iter_flags, s); } +int bch2_subvol_is_ro_trans(struct btree_trans *trans, u32 subvol) +{ + struct bch_subvolume s; + int ret = bch2_subvolume_get_inlined(trans, subvol, true, 0, &s); + if (ret) + return ret; + + if (BCH_SUBVOLUME_RO(&s)) + return -EROFS; + return 0; +} + +int bch2_subvol_is_ro(struct bch_fs *c, u32 subvol) +{ + return bch2_trans_do(c, NULL, NULL, 0, + bch2_subvol_is_ro_trans(trans, subvol)); +} + int bch2_snapshot_get_subvol(struct btree_trans *trans, u32 snapshot, struct bch_subvolume *subvol) { |