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| author | KangNing Liao <lkangn.kernel@gmail.com> | 2026-05-21 20:29:45 +0800 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2026-05-24 03:01:10 +0200 |
| commit | 060bd618196fc3c432386b28c072b524f4d2de38 (patch) | |
| tree | efc37817a05fff559b3a39a74800231eb33421fa /fs | |
| parent | 1f064323fb2fcdb9b163494518b0324bf7751b5f (diff) | |
| download | linux-next-history-060bd618196fc3c432386b28c072b524f4d2de38.tar.gz | |
btrfs: protect sb_write_pointer() with invalidate lock
sb_write_pointer() reads the super block from the block device page cache
using read_cache_page_gfp(). This has the same race with BLKBSZSET as the
one fixed by commit 3f29d661e568 ("btrfs: sync read disk super and set
block size").
Take the mapping invalidate lock around read_cache_page_gfp() to
serialize the read against block size changes.
Signed-off-by: KangNing Liao <lkangn.kernel@gmail.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/btrfs/zoned.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/btrfs/zoned.c b/fs/btrfs/zoned.c index 16dd87aa06f20..5f75cf0e14b95 100644 --- a/fs/btrfs/zoned.c +++ b/fs/btrfs/zoned.c @@ -131,8 +131,10 @@ static int sb_write_pointer(struct block_device *bdev, struct blk_zone *zones, u64 bytenr = ALIGN_DOWN(zone_end, BTRFS_SUPER_INFO_SIZE) - BTRFS_SUPER_INFO_SIZE; + filemap_invalidate_lock(mapping); page[i] = read_cache_page_gfp(mapping, bytenr >> PAGE_SHIFT, GFP_NOFS); + filemap_invalidate_unlock(mapping); if (IS_ERR(page[i])) { if (i == 1) btrfs_release_disk_super(super[0]); |