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Btrfs: free space cache: make sure there is always room for generation number

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io_ctl_set_generation() assumes that the generation number shares
the same page with inline CRCs. Let's make sure this is always true.

Signed-off-by: Zhihui Zhang <zzhsuny@gmail.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Zhihui Zhang 2018-07-02 20:00:54 -04:00 committed by David Sterba
parent 694c51fb2e
commit 8f6c72a9e0
1 changed files with 2 additions and 2 deletions
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4
fs/btrfs/free-space-cache.c
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@ -300,9 +300,9 @@ static int io_ctl_init(struct btrfs_io_ctl *io_ctl, struct inode *inode,
if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FREE_INO_OBJECTID)
check_crcs = 1;
/* Make sure we can fit our crcs into the first page */
/* Make sure we can fit our crcs and generation into the first page */
if (write && check_crcs &&
(num_pages * sizeof(u32)) >= PAGE_SIZE)
(num_pages * sizeof(u32) + sizeof(u64)) > PAGE_SIZE)
return -ENOSPC;
memset(io_ctl, 0, sizeof(struct btrfs_io_ctl));