Patch "f2fs: fix lock dependency in between dio_rwsem & i_mmap_sem" has been added to the 4.15-stable tree

[<gregkh@linuxfoundation.org>]

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

    f2fs: fix lock dependency in between dio_rwsem & i_mmap_sem

to the 4.15-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:
     f2fs-fix-lock-dependency-in-between-dio_rwsem-i_mmap_sem.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 foo@baz Mon Apr  9 10:16:32 CEST 2018
From: Chao Yu <yuchao0@huawei.com>
Date: Thu, 23 Nov 2017 23:26:52 +0800
Subject: f2fs: fix lock dependency in between dio_rwsem & i_mmap_sem

From: Chao Yu <yuchao0@huawei.com>


[ Upstream commit 21020812c9e1ab593367fad9ce579f842a0b406d ]

test/generic/208 reports a potential deadlock as below:

Chain exists of:
  &mm->mmap_sem --> &fi->i_mmap_sem --> &fi->dio_rwsem[WRITE]

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&fi->dio_rwsem[WRITE]);
                               lock(&fi->i_mmap_sem);
                               lock(&fi->dio_rwsem[WRITE]);
  lock(&mm->mmap_sem);

This patch changes the lock dependency as below in fallocate() to
fix this issue:
- dio_rwsem
 - i_mmap_sem

Fixes: bb06664a534b ("f2fs: avoid race in between GC and block exchange")
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 fs/f2fs/file.c |   20 +++++++++-----------
 1 file changed, 9 insertions(+), 11 deletions(-)

--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -1186,14 +1186,14 @@ static int f2fs_collapse_range(struct in
 	pg_start = offset >> PAGE_SHIFT;
 	pg_end = (offset + len) >> PAGE_SHIFT;
 
+	/* avoid gc operation during block exchange */
+	down_write(&F2FS_I(inode)->dio_rwsem[WRITE]);
+
 	down_write(&F2FS_I(inode)->i_mmap_sem);
 	/* write out all dirty pages from offset */
 	ret = filemap_write_and_wait_range(inode->i_mapping, offset, LLONG_MAX);
 	if (ret)
-		goto out;
-
-	/* avoid gc operation during block exchange */
-	down_write(&F2FS_I(inode)->dio_rwsem[WRITE]);
+		goto out_unlock;
 
 	truncate_pagecache(inode, offset);
 
@@ -1212,9 +1212,8 @@ static int f2fs_collapse_range(struct in
 	if (!ret)
 		f2fs_i_size_write(inode, new_size);
 out_unlock:
-	up_write(&F2FS_I(inode)->dio_rwsem[WRITE]);
-out:
 	up_write(&F2FS_I(inode)->i_mmap_sem);
+	up_write(&F2FS_I(inode)->dio_rwsem[WRITE]);
 	return ret;
 }
 
@@ -1385,6 +1384,9 @@ static int f2fs_insert_range(struct inod
 
 	f2fs_balance_fs(sbi, true);
 
+	/* avoid gc operation during block exchange */
+	down_write(&F2FS_I(inode)->dio_rwsem[WRITE]);
+
 	down_write(&F2FS_I(inode)->i_mmap_sem);
 	ret = truncate_blocks(inode, i_size_read(inode), true);
 	if (ret)
@@ -1395,9 +1397,6 @@ static int f2fs_insert_range(struct inod
 	if (ret)
 		goto out;
 
-	/* avoid gc operation during block exchange */
-	down_write(&F2FS_I(inode)->dio_rwsem[WRITE]);
-
 	truncate_pagecache(inode, offset);
 
 	pg_start = offset >> PAGE_SHIFT;
@@ -1425,10 +1424,9 @@ static int f2fs_insert_range(struct inod
 
 	if (!ret)
 		f2fs_i_size_write(inode, new_size);
-
-	up_write(&F2FS_I(inode)->dio_rwsem[WRITE]);
 out:
 	up_write(&F2FS_I(inode)->i_mmap_sem);
+	up_write(&F2FS_I(inode)->dio_rwsem[WRITE]);
 	return ret;
 }
 


Patches currently in stable-queue which might be from yuchao0@huawei.com are

queue-4.15/f2fs-fix-lock-dependency-in-between-dio_rwsem-i_mmap_sem.patch