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btrfs: use mapping shared locking for reading super block

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There's no need to exclusively lock the mapping, shared locking is enough
to protect from a concurrent set block size operation (BLKBSZSET ioctl).

Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Filipe Manana
2026-05-31 11:36:06 +01:00
committed by Johannes Thumshirn
parent 1ba72d847c
commit 00608e3416
2 changed files with 4 additions and 4 deletions
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4
fs/btrfs/volumes.c
View File

@@ -1369,9 +1369,9 @@ struct btrfs_super_block *btrfs_read_disk_super(struct block_device *bdev,
(bytenr + BTRFS_SUPER_INFO_SIZE) >> PAGE_SHIFT);
}
filemap_invalidate_lock(mapping);
filemap_invalidate_lock_shared(mapping);
page = read_cache_page_gfp(mapping, bytenr >> PAGE_SHIFT, GFP_NOFS);
filemap_invalidate_unlock(mapping);
filemap_invalidate_unlock_shared(mapping);
if (IS_ERR(page))
return ERR_CAST(page);

4
fs/btrfs/zoned.c
View File

@@ -131,10 +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);
filemap_invalidate_lock_shared(mapping);
page[i] = read_cache_page_gfp(mapping,
bytenr >> PAGE_SHIFT, GFP_NOFS);
filemap_invalidate_unlock(mapping);
filemap_invalidate_unlock_shared(mapping);
if (IS_ERR(page[i])) {
if (i == 1)
btrfs_release_disk_super(super[0]);