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authorThomas Gleixner <tglx@mtd.linutronix.de>2005-11-29 16:57:17 +0100
committerThomas Gleixner <tglx@mtd.linutronix.de>2005-11-29 16:57:17 +0100
commit21eeb7aa116b1f59fc23339521173cbb13e57f1a (patch)
treeaca16132a18dca8c8bf3417d118ad9d98834db32
parentbc4117f8767203927e78b92e9e5b3ddb71d6a84d (diff)
[JFFS2] Fix the slab cache constructor of 'struct jffs2_inode_info' objects.
JFFS2 initialize f->sem mutex as "locked" in the slab constructor which is a bug. Objects are freed with unlocked f->sem mutex. So, when they allocated again, f->sem is unlocked because the slab cache constructor is not called for them. The constructor is called only once when memory pages are allocated for objects (namely, when the slab layer allocates new slabs). So, sometimes 'struct jffs2_inode_info' are allocated with unlocked f->sem, sometimes with locked. This is a bug. Instead, initialize f->sem as unlocked in the constructor. I.e., in the "constructed" state f->sem must be unlocked. From: Keijiro Yano <keijiro_yano@yahoo.co.jp> Acked-by: Artem B. Bityutskiy <dedekind@infradead.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
-rw-r--r--fs/jffs2/fs.c2
-rw-r--r--fs/jffs2/super.c2
2 files changed, 3 insertions, 1 deletions
diff --git a/fs/jffs2/fs.c b/fs/jffs2/fs.c
index 543420665c5..d0fcc5f3497 100644
--- a/fs/jffs2/fs.c
+++ b/fs/jffs2/fs.c
@@ -234,6 +234,7 @@ void jffs2_read_inode (struct inode *inode)
c = JFFS2_SB_INFO(inode->i_sb);
jffs2_init_inode_info(f);
+ down(&f->sem);
ret = jffs2_do_read_inode(c, f, inode->i_ino, &latest_node);
@@ -400,6 +401,7 @@ struct inode *jffs2_new_inode (struct inode *dir_i, int mode, struct jffs2_raw_i
f = JFFS2_INODE_INFO(inode);
jffs2_init_inode_info(f);
+ down(&f->sem);
memset(ri, 0, sizeof(*ri));
/* Set OS-specific defaults for new inodes */
diff --git a/fs/jffs2/super.c b/fs/jffs2/super.c
index 9e0b5458d9c..93883817cbd 100644
--- a/fs/jffs2/super.c
+++ b/fs/jffs2/super.c
@@ -51,7 +51,7 @@ static void jffs2_i_init_once(void * foo, kmem_cache_t * cachep, unsigned long f
if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
SLAB_CTOR_CONSTRUCTOR) {
- init_MUTEX_LOCKED(&ei->sem);
+ init_MUTEX(&ei->sem);
inode_init_once(&ei->vfs_inode);
}
}