Commit c5f7d0bb authored Apr 15, 2014 by Qu Wenruo Committed by Chris Mason Apr 24, 2014

btrfs: Change the hole range to a more accurate value.



Commit 3ac0d7b9 fixed the btrfs expanding
write problem but the hole punched is sometimes too large for some
iovec, which has unmapped data ranges.
This patch will change to hole range to a more accurate value using the
counts checked by the write check routines.

Reported-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>

parent 0040e606

fs/btrfs/file.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -1783,7 +1783,7 @@ static ssize_t btrfs_file_aio_write(struct kiocb *iocb,
		start_pos = round_down(pos, root->sectorsize);
		if (start_pos > i_size_read(inode)) {
		/* Expand hole size to cover write data, preventing empty gap */
		end_pos = round_up(pos + iov->iov_len, root->sectorsize);
		end_pos = round_up(pos + count, root->sectorsize);
		err = btrfs_cont_expand(inode, i_size_read(inode), end_pos);
		if (err) {
		mutex_unlock(&inode->i_mutex);

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