This is a note to let you know that I've just added the patch titled
fs/ufs: revert "ufs: fix deadlocks introduced by sb mutex merge"
to the 4.0-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:
fs-ufs-revert-ufs-fix-deadlocks-introduced-by-sb-mutex-merge.patch
and it can be found in the queue-4.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 13b987ea275840d74d9df9a44326632fab1894da Mon Sep 17 00:00:00 2001
From: Fabian Frederick <[email protected]>
Date: Wed, 10 Jun 2015 10:09:32 +1000
Subject: fs/ufs: revert "ufs: fix deadlocks introduced by sb mutex merge"
From: Fabian Frederick <[email protected]>
commit 13b987ea275840d74d9df9a44326632fab1894da upstream.
This reverts commit 9ef7db7f38d0 ("ufs: fix deadlocks introduced by sb
mutex merge") That patch tried to solve commit 0244756edc4b98c ("ufs: sb
mutex merge + mutex_destroy") which is itself partially reverted due to
multiple deadlocks.
Signed-off-by: Fabian Frederick <[email protected]>
Suggested-by: Jan Kara <[email protected]>
Cc: Ian Campbell <[email protected]>
Cc: Evgeniy Dushistov <[email protected]>
Cc: Alexey Khoroshilov <[email protected]>
Cc: Roger Pau Monne <[email protected]>
Cc: Ian Jackson <[email protected]>
Cc: Al Viro <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
fs/ufs/inode.c | 5 ++++-
fs/ufs/namei.c | 14 ++++++++------
2 files changed, 12 insertions(+), 7 deletions(-)
--- a/fs/ufs/inode.c
+++ b/fs/ufs/inode.c
@@ -902,6 +902,9 @@ void ufs_evict_inode(struct inode * inod
invalidate_inode_buffers(inode);
clear_inode(inode);
- if (want_delete)
+ if (want_delete) {
+ lock_ufs(inode->i_sb);
ufs_free_inode(inode);
+ unlock_ufs(inode->i_sb);
+ }
}
--- a/fs/ufs/namei.c
+++ b/fs/ufs/namei.c
@@ -128,12 +128,12 @@ static int ufs_symlink (struct inode * d
if (l > sb->s_blocksize)
goto out_notlocked;
+ lock_ufs(dir->i_sb);
inode = ufs_new_inode(dir, S_IFLNK | S_IRWXUGO);
err = PTR_ERR(inode);
if (IS_ERR(inode))
- goto out_notlocked;
+ goto out;
- lock_ufs(dir->i_sb);
if (l > UFS_SB(sb)->s_uspi->s_maxsymlinklen) {
/* slow symlink */
inode->i_op = &ufs_symlink_inode_operations;
@@ -184,9 +184,13 @@ static int ufs_mkdir(struct inode * dir,
struct inode * inode;
int err;
+ lock_ufs(dir->i_sb);
+ inode_inc_link_count(dir);
+
inode = ufs_new_inode(dir, S_IFDIR|mode);
+ err = PTR_ERR(inode);
if (IS_ERR(inode))
- return PTR_ERR(inode);
+ goto out_dir;
inode->i_op = &ufs_dir_inode_operations;
inode->i_fop = &ufs_dir_operations;
@@ -194,9 +198,6 @@ static int ufs_mkdir(struct inode * dir,
inode_inc_link_count(inode);
- lock_ufs(dir->i_sb);
- inode_inc_link_count(dir);
-
err = ufs_make_empty(inode, dir);
if (err)
goto out_fail;
@@ -215,6 +216,7 @@ out_fail:
inode_dec_link_count(inode);
unlock_new_inode(inode);
iput (inode);
+out_dir:
inode_dec_link_count(dir);
unlock_ufs(dir->i_sb);
goto out;
Patches currently in stable-queue which might be from [email protected] are
queue-4.0/fs-ufs-restore-s_lock-mutex.patch
queue-4.0/fs-ufs-revert-ufs-fix-deadlocks-introduced-by-sb-mutex-merge.patch
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