This is a note to let you know that I've just added the patch titled
reiserfs: don't preallocate blocks for extended attributes
to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: reiserfs-don-t-preallocate-blocks-for-extended-attributes.patch and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From 54930dfeb46e978b447af0fb8ab4e181c1bf9d7a Mon Sep 17 00:00:00 2001
From: Jeff Mahoney jeffm@suse.com Date: Thu, 22 Jun 2017 16:35:04 -0400 Subject: reiserfs: don't preallocate blocks for extended attributes
From: Jeff Mahoney jeffm@suse.com
commit 54930dfeb46e978b447af0fb8ab4e181c1bf9d7a upstream.
Most extended attributes will fit in a single block. More importantly, we drop the reference to the inode while holding the transaction open so the preallocated blocks aren't released. As a result, the inode may be evicted before it's removed from the transaction's prealloc list which can cause memory corruption.
Signed-off-by: Jeff Mahoney jeffm@suse.com Signed-off-by: Jan Kara jack@suse.cz Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- fs/reiserfs/bitmap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/fs/reiserfs/bitmap.c +++ b/fs/reiserfs/bitmap.c @@ -1136,7 +1136,7 @@ static int determine_prealloc_size(reise hint->prealloc_size = 0;
if (!hint->formatted_node && hint->preallocate) { - if (S_ISREG(hint->inode->i_mode) + if (S_ISREG(hint->inode->i_mode) && !IS_PRIVATE(hint->inode) && hint->inode->i_size >= REISERFS_SB(hint->th->t_super)->s_alloc_options. preallocmin * hint->inode->i_sb->s_blocksize)
Patches currently in stable-queue which might be from jeffm@suse.com are
queue-4.9/reiserfs-don-t-preallocate-blocks-for-extended-attributes.patch queue-4.9/reiserfs-fix-race-in-prealloc-discard.patch