Commit 728404da authored by Filipe Manana's avatar Filipe Manana Committed by Chris Mason
Browse files

Btrfs: add helper btrfs_fdatawrite_range 



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

Signed-off-by: default avatarFilipe Manana <fdmanana@suse.com>
Signed-off-by: default avatarChris Mason <clm@fb.com>
parent 075bdbdb

fs/btrfs/ctree.h

+1 −0
Original line number Diff line number Diff line
@@ -3901,6 +3901,7 @@ int btrfs_dirty_pages(struct btrfs_root *root, struct inode *inode, 
		      struct page **pages, size_t num_pages,

		      loff_t pos, size_t write_bytes,

		      struct extent_state **cached);

int btrfs_fdatawrite_range(struct inode *inode, loff_t start, loff_t end);



/* tree-defrag.c */

int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,

fs/btrfs/file.c

+30 −9
Original line number Diff line number Diff line
@@ -1676,6 +1676,7 @@ static ssize_t __btrfs_direct_write(struct kiocb *iocb, 
				    loff_t pos)

{

	struct file *file = iocb->ki_filp;

	struct inode *inode = file_inode(file);

	ssize_t written;

	ssize_t written_buffered;

	loff_t endbyte;
@@ -1697,13 +1698,10 @@ static ssize_t __btrfs_direct_write(struct kiocb *iocb, 
	 * able to read what was just written.

	 */

	endbyte = pos + written_buffered - 1;

	err = filemap_fdatawrite_range(file->f_mapping, pos, endbyte);

	if (!err && test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT,

			     &BTRFS_I(file_inode(file))->runtime_flags))

		err = filemap_fdatawrite_range(file->f_mapping, pos, endbyte);

	err = btrfs_fdatawrite_range(inode, pos, endbyte);

	if (err)

		goto out;

	err = filemap_fdatawait_range(file->f_mapping, pos, endbyte);

	err = filemap_fdatawait_range(inode->i_mapping, pos, endbyte);

	if (err)

		goto out;

	written += written_buffered;
@@ -1864,10 +1862,7 @@ static int start_ordered_ops(struct inode *inode, loff_t start, loff_t end) 
	int ret;



	atomic_inc(&BTRFS_I(inode)->sync_writers);

	ret = filemap_fdatawrite_range(inode->i_mapping, start, end);

	if (!ret && test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT,

			     &BTRFS_I(inode)->runtime_flags))

		ret = filemap_fdatawrite_range(inode->i_mapping, start, end);

	ret = btrfs_fdatawrite_range(inode, start, end);

	atomic_dec(&BTRFS_I(inode)->sync_writers);



	return ret;
@@ -2820,3 +2815,29 @@ int btrfs_auto_defrag_init(void) 


	return 0;

}



int btrfs_fdatawrite_range(struct inode *inode, loff_t start, loff_t end)

{

	int 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.

	 */

	ret = filemap_fdatawrite_range(inode->i_mapping, start, end);

	if (!ret && test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT,

			     &BTRFS_I(inode)->runtime_flags))

		ret = filemap_fdatawrite_range(inode->i_mapping, start, end);



	return ret;

}

fs/btrfs/inode.c

+1 −8
Original line number Diff line number Diff line
@@ -7015,14 +7015,7 @@ static int lock_extent_direct(struct inode *inode, u64 lockstart, u64 lockend, 
			btrfs_put_ordered_extent(ordered);

		} else {

			/* Screw you mmap */

			ret = filemap_fdatawrite_range(inode->i_mapping,

						       lockstart,

						       lockend);

			if (!ret && test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT,

					     &BTRFS_I(inode)->runtime_flags))

				ret = filemap_fdatawrite_range(inode->i_mapping,

							       lockstart,

							       lockend);

			ret = btrfs_fdatawrite_range(inode, lockstart, lockend);

			if (ret)

				break;

			ret = filemap_fdatawait_range(inode->i_mapping,

fs/btrfs/ordered-data.c

+2 −22
Original line number Diff line number Diff line
@@ -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;

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