From: Chris Mason Date: Tue, 2 Sep 2014 02:12:52 +0000 (+1000) Subject: xfs: don't zero partial page cache pages during O_DIRECT writes X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=85e584da3212140ee80fd047f9058bbee0bc00d5;p=openwrt%2Fstaging%2Fblogic.git xfs: don't zero partial page cache pages during O_DIRECT writes xfs is using truncate_pagecache_range to invalidate the page cache during DIO reads. This is different from the other filesystems who only invalidate pages during DIO writes. truncate_pagecache_range is meant to be used when we are freeing the underlying data structs from disk, so it will zero any partial ranges in the page. This means a DIO read can zero out part of the page cache page, and it is possible the page will stay in cache. buffered reads will find an up to date page with zeros instead of the data actually on disk. This patch fixes things by using invalidate_inode_pages2_range instead. It preserves the page cache invalidation, but won't zero any pages. [dchinner: catch error and warn if it fails. Comment.] cc: stable@vger.kernel.org Signed-off-by: Chris Mason Reviewed-by: Dave Chinner Reviewed-by: Brian Foster Reviewed-by: Christoph Hellwig Signed-off-by: Dave Chinner --- diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index 076b1708d134..827cfb2451b1 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -296,7 +296,16 @@ xfs_file_read_iter( xfs_rw_iunlock(ip, XFS_IOLOCK_EXCL); return ret; } - truncate_pagecache_range(VFS_I(ip), pos, -1); + + /* + * Invalidate whole pages. This can return an error if + * we fail to invalidate a page, but this should never + * happen on XFS. Warn if it does fail. + */ + ret = invalidate_inode_pages2_range(VFS_I(ip)->i_mapping, + pos >> PAGE_CACHE_SHIFT, -1); + WARN_ON_ONCE(ret); + ret = 0; } xfs_rw_ilock_demote(ip, XFS_IOLOCK_EXCL); }