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Commit e4826a5b authored by chandan's avatar chandan Committed by Chris Mason
Browse files

Btrfs: btrfs_defrag_file: Fix ra_index computation. 



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: default avatarChandan Rajendra <chandan@linux.vnet.ibm.com>
Signed-off-by: default avatarChris Mason <clm@fb.com>
parent 4617ea3a

fs/btrfs/ioctl.c

+1 −1
Original line number Diff line number Diff line
@@ -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);