This is a note to let you know that I've just added the patch titled

xfs: preserve i_rdev when recycling a reclaimable inode

to the 4.15-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: xfs-preserve-i_rdev-when-recycling-a-reclaimable-inode.patch and it can be found in the queue-4.15 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 acd1d71598f7654b6d7718bcbe979992295c672a Mon Sep 17 00:00:00 2001

From: Amir Goldstein amir73il@gmail.com Date: Fri, 26 Jan 2018 11:24:40 -0800 Subject: xfs: preserve i_rdev when recycling a reclaimable inode

From: Amir Goldstein amir73il@gmail.com

commit acd1d71598f7654b6d7718bcbe979992295c672a upstream.

Commit 66f364649d870 ("xfs: remove if_rdev") moved storing of rdev value for special inodes to VFS inodes, but forgot to preserve the value of i_rdev when recycling a reclaimable xfs_inode.

This was detected by xfstest overlay/017 with inodex=on mount option and xfs base fs. The test does a lookup of overlay chardev and blockdev right after drop caches.

Overlayfs inodes hold a reference on underlying xfs inodes when mount option index=on is configured. If drop caches reclaim xfs inodes, before it relclaims overlayfs inodes, that can sometimes leave a reclaimable xfs inode and that test hits that case quite often.

When that happens, the xfs inode cache remains broken (zere i_rdev) until the next cycle mount or drop caches.

Fixes: 66f364649d870 ("xfs: remove if_rdev") Signed-off-by: Amir Goldstein amir73il@gmail.com Reviewed-by: Christoph Hellwig hch@lst.de Reviewed-by: Darrick J. Wong darrick.wong@oracle.com Signed-off-by: Darrick J. Wong darrick.wong@oracle.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

--- fs/xfs/xfs_icache.c | 2 ++ 1 file changed, 2 insertions(+)

--- a/fs/xfs/xfs_icache.c +++ b/fs/xfs/xfs_icache.c @@ -295,6 +295,7 @@ xfs_reinit_inode( uint32_t generation = inode->i_generation; uint64_t version = inode->i_version; umode_t mode = inode->i_mode; + dev_t dev = inode->i_rdev;

error = inode_init_always(mp->m_super, inode);

@@ -302,6 +303,7 @@ xfs_reinit_inode( inode->i_generation = generation; inode->i_version = version; inode->i_mode = mode; + inode->i_rdev = dev; return error; }

Patches currently in stable-queue which might be from amir73il@gmail.com are

queue-4.15/xfs-preserve-i_rdev-when-recycling-a-reclaimable-inode.patch