Patch "xfs: always free inline data before resetting inode fork during ifree" has been added to the 4.14-stable tree

Patch "xfs: always free inline data before resetting inode fork during ifree" has been added to the 4.14-stable tree

[gregkh]

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

    xfs: always free inline data before resetting inode fork during ifree

to the 4.14-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     xfs-always-free-inline-data-before-resetting-inode-fork-during-ifree.patch
and it can be found in the queue-4.14 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 foo@baz Thu Feb  1 13:45:42 CET 2018
From: "Darrick J. Wong" <darrick.wong@oracle.com>
Date: Wed, 22 Nov 2017 12:21:07 -0800
Subject: xfs: always free inline data before resetting inode fork during ifree

From: "Darrick J. Wong" <darrick.wong@oracle.com>


[ Upstream commit 98c4f78dcdd8cec112d1cbc5e9a792ee6e5ab7a6 ]

In xfs_ifree, we reset the data/attr forks to extents format without
bothering to free any inline data buffer that might still be around
after all the blocks have been truncated off the file.  Prior to commit
43518812d2 ("xfs: remove support for inlining data/extents into the
inode fork") nobody noticed because the leftover inline data after
truncation was small enough to fit inside the inline buffer inside the
fork itself.

However, now that we've removed the inline buffer, we /always/ have to
free the inline data buffer or else we leak them like crazy.  This test
was found by turning on kmemleak for generic/001 or generic/388.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 fs/xfs/xfs_inode.c |   21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -2422,6 +2422,24 @@ retry:
 }
 
 /*
+ * Free any local-format buffers sitting around before we reset to
+ * extents format.
+ */
+static inline void
+xfs_ifree_local_data(
+	struct xfs_inode	*ip,
+	int			whichfork)
+{
+	struct xfs_ifork	*ifp;
+
+	if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL)
+		return;
+
+	ifp = XFS_IFORK_PTR(ip, whichfork);
+	xfs_idata_realloc(ip, -ifp->if_bytes, whichfork);
+}
+
+/*
  * This is called to return an inode to the inode free list.
  * The inode should already be truncated to 0 length and have
  * no pages associated with it.  This routine also assumes that
@@ -2458,6 +2476,9 @@ xfs_ifree(
 	if (error)
 		return error;
 
+	xfs_ifree_local_data(ip, XFS_DATA_FORK);
+	xfs_ifree_local_data(ip, XFS_ATTR_FORK);
+
 	VFS_I(ip)->i_mode = 0;		/* mark incore inode as free */
 	ip->i_d.di_flags = 0;
 	ip->i_d.di_dmevmask = 0;


Patches currently in stable-queue which might be from darrick.wong@oracle.com are

queue-4.14/xfs-always-free-inline-data-before-resetting-inode-fork-during-ifree.patch
queue-4.14/xfs-log-recovery-should-replay-deferred-ops-in-order.patch
queue-4.14/xfs-ubsan-fixes.patch
queue-4.14/xfs-fortify-xfs_alloc_buftarg-error-handling.patch
queue-4.14/xfs-properly-retry-failed-dquot-items-in-case-of-error-during-buffer-writeback.patch