This is a note to let you know that I've just added the patch titled
Revert "sysfs: fix race between readdir and lseek"
to the 3.0-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:
revert-sysfs-fix-race-between-readdir-and-lseek.patch
and it can be found in the queue-3.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From [email protected] Mon Apr 22 09:30:43 2013
From: Jiri Kosina <[email protected]>
Date: Mon, 22 Apr 2013 15:40:15 +0200 (CEST)
Subject: Revert "sysfs: fix race between readdir and lseek"
To: [email protected]
Cc: [email protected]
Message-ID: <[email protected]>
From: Jiri Kosina <[email protected]>
This reverts commit 991f76f837bf22c5bb07261cfd86525a0a96650c in Linus'
tree which is f366c8f271888f48e15cc7c0ab70f184c220c8a4 in
linux-stable.git
It depends on ef3d0fd27e90f ("vfs: do (nearly) lockless generic_file_llseek")
which is available only in 3.2+.
When applied on 3.0 codebase, it causes A-A deadlock, whenever anyone does
seek() on sysfs, as both generic_file_llseek() and sysfs_dir_llseek() obtain
i_mutex.
Signed-off-by: Jiri Kosina <[email protected]>
Cc: Jiri Slaby <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
fs/sysfs/dir.c | 14 +-------------
1 file changed, 1 insertion(+), 13 deletions(-)
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -959,21 +959,9 @@ static int sysfs_readdir(struct file * f
return 0;
}
-static loff_t sysfs_dir_llseek(struct file *file, loff_t offset, int whence)
-{
- struct inode *inode = file->f_path.dentry->d_inode;
- loff_t ret;
-
- mutex_lock(&inode->i_mutex);
- ret = generic_file_llseek(file, offset, whence);
- mutex_unlock(&inode->i_mutex);
-
- return ret;
-}
-
const struct file_operations sysfs_dir_operations = {
.read = generic_read_dir,
.readdir = sysfs_readdir,
.release = sysfs_dir_release,
- .llseek = sysfs_dir_llseek,
+ .llseek = generic_file_llseek,
};
Patches currently in stable-queue which might be from [email protected] are
queue-3.0/revert-sysfs-fix-race-between-readdir-and-lseek.patch
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