Commit d96dbb06 authored by Chris Mason's avatar Chris Mason Committed by Greg Kroah-Hartman

xfs: don't zero partial page cache pages during O_DIRECT writes

commit 85e584da3212140ee80fd047f9058bbee0bc00d5 upstream.

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.]
Signed-off-by: default avatarChris Mason <>
Reviewed-by: default avatarDave Chinner <>
Reviewed-by: default avatarBrian Foster <>
Reviewed-by: default avatarChristoph Hellwig <>
Signed-off-by: default avatarDave Chinner <>
Signed-off-by: default avatarGreg Kroah-Hartman <>
parent 1025b461
......@@ -298,7 +298,16 @@ xfs_file_aio_read(
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);
ret = 0;
xfs_rw_ilock_demote(ip, XFS_IOLOCK_EXCL);
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment