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btrfs: use correct offset for reloc_inode in prealloc_file_extent_cluster() 

In prealloc_file_extent_cluster(), btrfs_check_data_free_space() uses
wrong file offset for reloc_inode, it uses cluster->start and cluster->end,
which indeed are extent's bytenr. The correct value should be
cluster->[start|end] minus block group's start bytenr.

start bytenr   cluster->start
|              |     extent      |   extent   | ...| extent |
|----------------------------------------------------------------|
|                block group reloc_inode                         |

Signed-off-by: Wang Xiaoguang <wangxg.fnst@cn.fujitsu.com>
Reviewed-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Wang Xiaoguang 2016-07-25 15:51:38 +08:00 committed by Chris Mason
parent df2c95f33e
commit dcb40c196f
1 changed files with 6 additions and 4 deletions
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10
fs/btrfs/relocation.c
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@ -3038,12 +3038,14 @@ int prealloc_file_extent_cluster(struct inode *inode,
u64 num_bytes;
int nr = 0;
int ret = 0;
u64 prealloc_start = cluster->start - offset;
u64 prealloc_end = cluster->end - offset;
BUG_ON(cluster->start != cluster->boundary[0]);
inode_lock(inode);
ret = btrfs_check_data_free_space(inode, cluster->start,
cluster->end + 1 - cluster->start);
ret = btrfs_check_data_free_space(inode, prealloc_start,
prealloc_end + 1 - prealloc_start);
if (ret)
goto out;
@ -3064,8 +3066,8 @@ int prealloc_file_extent_cluster(struct inode *inode,
break;
nr++;
}
btrfs_free_reserved_data_space(inode, cluster->start,
cluster->end + 1 - cluster->start);
btrfs_free_reserved_data_space(inode, prealloc_start,
prealloc_end + 1 - prealloc_start);
out:
inode_unlock(inode);
return ret;