Merge branch 'v4l_for_linus' of git://linuxtv.org/mchehab/for_linus

[cascardo/linux.git] / fs / inode.c

diff --git a/fs/inode.c b/fs/inode.c
index a48fa53..ec79246 100644 (file)
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -143,6 +143,7 @@ int inode_init_always(struct super_block *sb, struct inode *inode)
        inode->i_op = &empty_iops;
        inode->i_fop = &empty_fops;
        inode->i_nlink = 1;
+       inode->i_opflags = 0;
        inode->i_uid = 0;
        inode->i_gid = 0;
        atomic_set(&inode->i_writecount, 0);
@@ -361,9 +362,11 @@ EXPORT_SYMBOL_GPL(inode_sb_list_add);
 
 static inline void inode_sb_list_del(struct inode *inode)
 {
-       spin_lock(&inode_sb_list_lock);
-       list_del_init(&inode->i_sb_list);
-       spin_unlock(&inode_sb_list_lock);
+       if (!list_empty(&inode->i_sb_list)) {
+               spin_lock(&inode_sb_list_lock);
+               list_del_init(&inode->i_sb_list);
+               spin_unlock(&inode_sb_list_lock);
+       }
 }
 
 static unsigned long hash(struct super_block *sb, unsigned long hashval)
@@ -397,12 +400,12 @@ void __insert_inode_hash(struct inode *inode, unsigned long hashval)
 EXPORT_SYMBOL(__insert_inode_hash);
 
 /**
- *     remove_inode_hash - remove an inode from the hash
+ *     __remove_inode_hash - remove an inode from the hash
  *     @inode: inode to unhash
  *
  *     Remove an inode from the superblock.
  */
-void remove_inode_hash(struct inode *inode)
+void __remove_inode_hash(struct inode *inode)
 {
        spin_lock(&inode_hash_lock);
        spin_lock(&inode->i_lock);
@@ -410,7 +413,7 @@ void remove_inode_hash(struct inode *inode)
        spin_unlock(&inode->i_lock);
        spin_unlock(&inode_hash_lock);
 }
-EXPORT_SYMBOL(remove_inode_hash);
+EXPORT_SYMBOL(__remove_inode_hash);
 
 void end_writeback(struct inode *inode)
 {
@@ -452,7 +455,9 @@ static void evict(struct inode *inode)
        BUG_ON(!(inode->i_state & I_FREEING));
        BUG_ON(!list_empty(&inode->i_lru));
 
-       inode_wb_list_del(inode);
+       if (!list_empty(&inode->i_wb_list))
+               inode_wb_list_del(inode);
+
        inode_sb_list_del(inode);
 
        if (op->evict_inode) {
@@ -795,6 +800,29 @@ unsigned int get_next_ino(void)
 }
 EXPORT_SYMBOL(get_next_ino);
 
+/**
+ *     new_inode_pseudo        - obtain an inode
+ *     @sb: superblock
+ *
+ *     Allocates a new inode for given superblock.
+ *     Inode wont be chained in superblock s_inodes list
+ *     This means :
+ *     - fs can't be unmount
+ *     - quotas, fsnotify, writeback can't work
+ */
+struct inode *new_inode_pseudo(struct super_block *sb)
+{
+       struct inode *inode = alloc_inode(sb);
+
+       if (inode) {
+               spin_lock(&inode->i_lock);
+               inode->i_state = 0;
+               spin_unlock(&inode->i_lock);
+               INIT_LIST_HEAD(&inode->i_sb_list);
+       }
+       return inode;
+}
+
 /**
  *     new_inode       - obtain an inode
  *     @sb: superblock
@@ -813,27 +841,16 @@ struct inode *new_inode(struct super_block *sb)
 
        spin_lock_prefetch(&inode_sb_list_lock);
 
-       inode = alloc_inode(sb);
-       if (inode) {
-               spin_lock(&inode->i_lock);
-               inode->i_state = 0;
-               spin_unlock(&inode->i_lock);
+       inode = new_inode_pseudo(sb);
+       if (inode)
                inode_sb_list_add(inode);
-       }
        return inode;
 }
 EXPORT_SYMBOL(new_inode);
 
-/**
- * unlock_new_inode - clear the I_NEW state and wake up any waiters
- * @inode:     new inode to unlock
- *
- * Called when the inode is fully initialised to clear the new state of the
- * inode and wake up anyone waiting for the inode to finish initialisation.
- */
-void unlock_new_inode(struct inode *inode)
-{
 #ifdef CONFIG_DEBUG_LOCK_ALLOC
+void lockdep_annotate_inode_mutex_key(struct inode *inode)
+{
        if (S_ISDIR(inode->i_mode)) {
                struct file_system_type *type = inode->i_sb->s_type;
 
@@ -849,7 +866,20 @@ void unlock_new_inode(struct inode *inode)
                                          &type->i_mutex_dir_key);
                }
        }
+}
+EXPORT_SYMBOL(lockdep_annotate_inode_mutex_key);
 #endif
+
+/**
+ * unlock_new_inode - clear the I_NEW state and wake up any waiters
+ * @inode:     new inode to unlock
+ *
+ * Called when the inode is fully initialised to clear the new state of the
+ * inode and wake up anyone waiting for the inode to finish initialisation.
+ */
+void unlock_new_inode(struct inode *inode)
+{
+       lockdep_annotate_inode_mutex_key(inode);
        spin_lock(&inode->i_lock);
        WARN_ON(!(inode->i_state & I_NEW));
        inode->i_state &= ~I_NEW;
@@ -1307,7 +1337,8 @@ static void iput_final(struct inode *inode)
        }
 
        inode->i_state |= I_FREEING;
-       inode_lru_list_del(inode);
+       if (!list_empty(&inode->i_lru))
+               inode_lru_list_del(inode);
        spin_unlock(&inode->i_lock);
 
        evict(inode);