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btrfs: fix mixed block count of available space 

Metadata for mixed block is already accounted in total data and should not
be counted as part of the free metadata space.

Signed-off-by: Luis de Bethencourt <luisbg@osg.samsung.com>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=114281
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Luis de Bethencourt 2016-03-30 21:53:38 +01:00 committed by David Sterba
parent 88be159c90
commit ae02d1bd07
1 changed files with 13 additions and 3 deletions
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16
fs/btrfs/super.c
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@ -2051,6 +2051,7 @@ static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf)
struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
int ret;
u64 thresh = 0;
int mixed = 0;
/*
* holding chunk_muext to avoid allocating new chunks, holding
@ -2076,8 +2077,17 @@ static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf)
}
}
}
if (found->flags & BTRFS_BLOCK_GROUP_METADATA)
total_free_meta += found->disk_total - found->disk_used;
/*
* Metadata in mixed block goup profiles are accounted in data
*/
if (!mixed && found->flags & BTRFS_BLOCK_GROUP_METADATA) {
if (found->flags & BTRFS_BLOCK_GROUP_DATA)
mixed = 1;
else
total_free_meta += found->disk_total -
found->disk_used;
}
total_used += found->disk_used;
}
@ -2115,7 +2125,7 @@ static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf)
*/
thresh = 4 * 1024 * 1024;
if (total_free_meta - thresh < block_rsv->size)
if (!mixed && total_free_meta - thresh < block_rsv->size)
buf->f_bavail = 0;
buf->f_type = BTRFS_SUPER_MAGIC;