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Commit 8f6c72a9 authored by Zhihui Zhang's avatar Zhihui Zhang Committed by David Sterba
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Btrfs: free space cache: make sure there is always room for generation number 



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: default avatarZhihui Zhang <zzhsuny@gmail.com>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent 694c51fb

fs/btrfs/free-space-cache.c

+2 −2
Original line number Diff line number Diff line
@@ -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));