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| author | Qu Wenruo <wqu@suse.com> | 2022-05-18 13:03:09 +0800 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2022-06-06 16:18:59 +0200 |
| commit | 0591f04036218d572d54349ea8c7914ad9c82b2b (patch) | |
| tree | dd7c2f03d703a3b6f92abb3db7d0798c4058ce86 /fs | |
| parent | 31e70e527806c546a72262f2fc3d982ee23c42d3 (diff) | |
| download | linux-0591f04036218d572d54349ea8c7914ad9c82b2b.tar.bz2 | |
btrfs: prevent remounting to v1 space cache for subpage mount
Upstream commit 9f73f1aef98b ("btrfs: force v2 space cache usage for
subpage mount") forces subpage mount to use v2 cache, to avoid
deprecated v1 cache which doesn't support subpage properly.
But there is a loophole that user can still remount to v1 cache.
The existing check will only give users a warning, but does not really
prevent to do the remount.
Although remounting to v1 will not cause any problems since the v1 cache
will always be marked invalid when mounted with a different page size,
it's still better to prevent v1 cache at all for subpage mounts.
Fixes: 9f73f1aef98b ("btrfs: force v2 space cache usage for subpage mount")
CC: stable@vger.kernel.org # 5.15+
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/btrfs/super.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index b1fdc6a26c76..1387fbe935c1 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -1985,6 +1985,14 @@ static int btrfs_remount(struct super_block *sb, int *flags, char *data) if (ret) goto restore; + /* V1 cache is not supported for subpage mount. */ + if (fs_info->sectorsize < PAGE_SIZE && btrfs_test_opt(fs_info, SPACE_CACHE)) { + btrfs_warn(fs_info, + "v1 space cache is not supported for page size %lu with sectorsize %u", + PAGE_SIZE, fs_info->sectorsize); + ret = -EINVAL; + goto restore; + } btrfs_remount_begin(fs_info, old_opts, *flags); btrfs_resize_thread_pool(fs_info, fs_info->thread_pool_size, old_thread_pool_size); |