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Btrfs: btrfs_defrag_file: Fix ra_index computation.

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Read-ahead is done for the pages in the range [ra_index, ra_index + cluster -
1]. So the next read-ahead should be starting from the page at index 'ra_index
+ cluster' (unless we deemed that the extent at 'ra_index + cluster' as
non-defraggable) rather than from the page at index 'ra_index +
max_cluster'. This patch fixes this. I did run the xfstests suite to make sure
that the code does not regress.

Signed-off-by: Chandan Rajendra <chandan@linux.vnet.ibm.com>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
chandan 2015-06-09 17:38:32 +05:30 committed by Chris Mason
parent 4617ea3a52
commit e4826a5b24
1 changed files with 1 additions and 1 deletions
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2
fs/btrfs/ioctl.c
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@ -1368,7 +1368,7 @@ int btrfs_defrag_file(struct inode *inode, struct file *file,
ra_index = max(i, ra_index);
btrfs_force_ra(inode->i_mapping, ra, file, ra_index,
cluster);
ra_index += max_cluster;
ra_index += cluster;
}
mutex_lock(&inode->i_mutex);