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Btrfs: add helper btrfs_fdatawrite_range

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To avoid duplicating this double filemap_fdatawrite_range() call for
inodes with async extents (compressed writes) so often.

Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Filipe Manana 2014-10-10 09:43:11 +01:00 • committed by Chris Mason
parent 075bdbdbe9
commit 728404dacf
4 changed files with 34 additions and 39 deletions
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24
fs/btrfs/ordered-data.c
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@ -725,30 +725,10 @@ int btrfs_wait_ordered_range(struct inode *inode, u64 start, u64 len)
/* start IO across the range first to instantiate any delalloc
* extents
*/
ret = filemap_fdatawrite_range(inode->i_mapping, start, orig_end);
ret = btrfs_fdatawrite_range(inode, start, orig_end);
if (ret)
return ret;
/*
* So with compression we will find and lock a dirty page and clear the
* first one as dirty, setup an async extent, and immediately return
* with the entire range locked but with nobody actually marked with
* writeback. So we can't just filemap_write_and_wait_range() and
* expect it to work since it will just kick off a thread to do the
* actual work. So we need to call filemap_fdatawrite_range _again_
* since it will wait on the page lock, which won't be unlocked until
* after the pages have been marked as writeback and so we're good to go
* from there. We have to do this otherwise we'll miss the ordered
* extents and that results in badness. Please Josef, do not think you
* know better and pull this out at some point in the future, it is
* right and you are wrong.
*/
if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT,
&BTRFS_I(inode)->runtime_flags)) {
ret = filemap_fdatawrite_range(inode->i_mapping, start,
orig_end);
if (ret)
return ret;
}
ret = filemap_fdatawait_range(inode->i_mapping, start, orig_end);
if (ret)
return ret;