1 files changed, 21 insertions, 27 deletions

diff --git a/fs/proc/generic.c b/fs/proc/generic.c
index 0d80cef4cfb9..76ddae83daa5 100644
--- a/fs/proc/generic.c
+++ b/fs/proc/generic.c
@@ -261,16 +261,9 @@ static int proc_notify_change(struct dentry *dentry, struct iattr *iattr)
         if (error)
                 return error;
 
-        if ((iattr->ia_valid & ATTR_SIZE) &&
-            iattr->ia_size != i_size_read(inode)) {
-                error = vmtruncate(inode, iattr->ia_size);
-                if (error)
-                        return error;
-        }
-
         setattr_copy(inode, iattr);
         mark_inode_dirty(inode);
-        
+
         de->uid = inode->i_uid;
         de->gid = inode->i_gid;
         de->mode = inode->i_mode;
@@ -350,37 +343,39 @@ static DEFINE_SPINLOCK(proc_inum_lock); /* protects the above */
  * Return an inode number between PROC_DYNAMIC_FIRST and
  * 0xffffffff, or zero on failure.
  */
-static unsigned int get_inode_number(void)
+int proc_alloc_inum(unsigned int *inum)
 {
         unsigned int i;
         int error;
 
 retry:
-        if (ida_pre_get(&proc_inum_ida, GFP_KERNEL) == 0)
-                return 0;
+        if (!ida_pre_get(&proc_inum_ida, GFP_KERNEL))
+                return -ENOMEM;
 
-        spin_lock(&proc_inum_lock);
+        spin_lock_irq(&proc_inum_lock);
         error = ida_get_new(&proc_inum_ida, &i);
-        spin_unlock(&proc_inum_lock);
+        spin_unlock_irq(&proc_inum_lock);
         if (error == -EAGAIN)
                 goto retry;
         else if (error)
-                return 0;
+                return error;
 
         if (i > UINT_MAX - PROC_DYNAMIC_FIRST) {
-                spin_lock(&proc_inum_lock);
+                spin_lock_irq(&proc_inum_lock);
                 ida_remove(&proc_inum_ida, i);
-                spin_unlock(&proc_inum_lock);
-                return 0;
+                spin_unlock_irq(&proc_inum_lock);
+                return -ENOSPC;
         }
-        return PROC_DYNAMIC_FIRST + i;
+        *inum = PROC_DYNAMIC_FIRST + i;
+        return 0;
 }
 
-static void release_inode_number(unsigned int inum)
+void proc_free_inum(unsigned int inum)
 {
-        spin_lock(&proc_inum_lock);
+        unsigned long flags;
+        spin_lock_irqsave(&proc_inum_lock, flags);
         ida_remove(&proc_inum_ida, inum - PROC_DYNAMIC_FIRST);
-        spin_unlock(&proc_inum_lock);
+        spin_unlock_irqrestore(&proc_inum_lock, flags);
 }
 
 static void *proc_follow_link(struct dentry *dentry, struct nameidata *nd)
@@ -554,13 +549,12 @@ static const struct inode_operations proc_dir_inode_operations = {
 
 static int proc_register(struct proc_dir_entry * dir, struct proc_dir_entry * dp)
 {
-        unsigned int i;
         struct proc_dir_entry *tmp;
+        int ret;
         
-        i = get_inode_number();
-        if (i == 0)
-                return -EAGAIN;
-        dp->low_ino = i;
+        ret = proc_alloc_inum(&dp->low_ino);
+        if (ret)
+                return ret;
 
         if (S_ISDIR(dp->mode)) {
                 if (dp->proc_iops == NULL) {
@@ -764,7 +758,7 @@ EXPORT_SYMBOL(proc_create_data);
 
 static void free_proc_entry(struct proc_dir_entry *de)
 {
-        release_inode_number(de->low_ino);
+        proc_free_inum(de->low_ino);
 
         if (S_ISLNK(de->mode))
                 kfree(de->data);