Commit f81c9cdc authored Aug 10, 2011 by Sage Weil Committed by Chris Mason Aug 16, 2011

Btrfs: truncate pages from clone ioctl target range



We need to truncate page cache pages for the clone ioctl target range or
else we'll confuse ourselves to no end.  If the old data was cached, we
used to still see it (until remount).  If the page was partially updated
we used to get a mix of old and new data.

Signed-off-by: Sage Weil <sage@newdream.net>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

parent 0e588859

fs/btrfs/ioctl.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -2244,6 +2244,10 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
		btrfs_wait_ordered_range(src, off, len);
		}

		/* truncate page cache pages from target inode range */
		truncate_inode_pages_range(&inode->i_data, off,
		ALIGN(off + len, PAGE_CACHE_SIZE) - 1);

		/* clone data */
		key.objectid = btrfs_ino(src);
		key.type = BTRFS_EXTENT_DATA_KEY;