1 files changed, 36 insertions, 2 deletions

diff --git a/fs/sysfs/inode.c b/fs/sysfs/inode.c
index e79e38d52c00..dd1344b007f5 100644
--- a/fs/sysfs/inode.c
+++ b/fs/sysfs/inode.c
@@ -13,6 +13,7 @@
 #include <linux/backing-dev.h>
 #include <linux/capability.h>
 #include <linux/errno.h>
+#include <asm/semaphore.h>
 #include "sysfs.h"
 
 extern struct super_block * sysfs_sb;
@@ -28,10 +29,20 @@ static struct backing_dev_info sysfs_backing_dev_info = {
         .capabilities   = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK,
 };
 
-static struct inode_operations sysfs_inode_operations ={
+static const struct inode_operations sysfs_inode_operations ={
         .setattr        = sysfs_setattr,
 };
 
+void sysfs_delete_inode(struct inode *inode)
+{
+        /* Free the shadowed directory inode operations */
+        if (sysfs_is_shadowed_inode(inode)) {
+                kfree(inode->i_op);
+                inode->i_op = NULL;
+        }
+        return generic_delete_inode(inode);
+}
+
 int sysfs_setattr(struct dentry * dentry, struct iattr * iattr)
 {
         struct inode * inode = dentry->d_inode;
@@ -209,6 +220,22 @@ const unsigned char * sysfs_get_name(struct sysfs_dirent *sd)
         return NULL;
 }
 
+static inline void orphan_all_buffers(struct inode *node)
+{
+        struct sysfs_buffer_collection *set = node->i_private;
+        struct sysfs_buffer *buf;
+
+        mutex_lock_nested(&node->i_mutex, I_MUTEX_CHILD);
+        if (node->i_private) {
+                list_for_each_entry(buf, &set->associates, associates) {
+                        down(&buf->sem);
+                        buf->orphaned = 1;
+                        up(&buf->sem);
+                }
+        }
+        mutex_unlock(&node->i_mutex);
+}
+
 
 /*
  * Unhashes the dentry corresponding to given sysfs_dirent
@@ -217,16 +244,23 @@ const unsigned char * sysfs_get_name(struct sysfs_dirent *sd)
 void sysfs_drop_dentry(struct sysfs_dirent * sd, struct dentry * parent)
 {
         struct dentry * dentry = sd->s_dentry;
+        struct inode *inode;
 
         if (dentry) {
                 spin_lock(&dcache_lock);
                 spin_lock(&dentry->d_lock);
                 if (!(d_unhashed(dentry) && dentry->d_inode)) {
+                        inode = dentry->d_inode;
+                        spin_lock(&inode->i_lock);
+                        __iget(inode);
+                        spin_unlock(&inode->i_lock);
                         dget_locked(dentry);
                         __d_drop(dentry);
                         spin_unlock(&dentry->d_lock);
                         spin_unlock(&dcache_lock);
                         simple_unlink(parent->d_inode, dentry);
+                        orphan_all_buffers(inode);
+                        iput(inode);
                 } else {
                         spin_unlock(&dentry->d_lock);
                         spin_unlock(&dcache_lock);
@@ -248,7 +282,7 @@ int sysfs_hash_and_remove(struct dentry * dir, const char * name)
                 return -ENOENT;
 
         parent_sd = dir->d_fsdata;
-        mutex_lock(&dir->d_inode->i_mutex);
+        mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT);
         list_for_each_entry(sd, &parent_sd->s_children, s_sibling) {
                 if (!sd->s_element)
                         continue;