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Btrfs: do not call btrfs_update_inode in endio if nothing changed 

In the DIO code we often don't update the i_disk_size because the i_size isn't
updated until after the DIO is completed, so basically we are allocating a path,
doing a search, and updating the inode item for no reason since nothing changed.
btrfs_ordered_update_i_size will return 1 if it didn't update i_disk_size, so
only run btrfs_update_inode if btrfs_ordered_update_i_size returns 0.  Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>
wifi-calibration
Josef Bacik 2011-04-05 19:25:36 -04:00
parent 12ddb96cb6
commit 1ef30be142
1 changed files with 10 additions and 5 deletions
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15
fs/btrfs/inode.c
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@ -1769,9 +1769,12 @@ static int btrfs_finish_ordered_io(struct inode *inode, u64 start, u64 end)
add_pending_csums(trans, inode, ordered_extent->file_offset,
&ordered_extent->list);
btrfs_ordered_update_i_size(inode, 0, ordered_extent);
ret = btrfs_update_inode(trans, root, inode);
BUG_ON(ret);
ret = btrfs_ordered_update_i_size(inode, 0, ordered_extent);
if (!ret) {
ret = btrfs_update_inode(trans, root, inode);
BUG_ON(ret);
}
ret = 0;
out:
if (nolock) {
if (trans)
@ -5865,8 +5868,10 @@ again:
}
add_pending_csums(trans, inode, ordered->file_offset, &ordered->list);
btrfs_ordered_update_i_size(inode, 0, ordered);
btrfs_update_inode(trans, root, inode);
ret = btrfs_ordered_update_i_size(inode, 0, ordered);
if (!ret)
btrfs_update_inode(trans, root, inode);
ret = 0;
out_unlock:
unlock_extent_cached(&BTRFS_I(inode)->io_tree, ordered->file_offset,
ordered->file_offset + ordered->len - 1,