1 files changed, 59 insertions, 118 deletions

diff --git a/fs/inode.c b/fs/inode.c
index a2da778467bb..86464332e590 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -289,32 +289,34 @@ void __iget(struct inode *inode)
         inodes_stat.nr_unused--;
 }
 
-/**
- * clear_inode - clear an inode
- * @inode: inode to clear
- *
- * This is called by the filesystem to tell us
- * that the inode is no longer useful. We just
- * terminate it with extreme prejudice.
- */
-void clear_inode(struct inode *inode)
+void end_writeback(struct inode *inode)
 {
         might_sleep();
-        invalidate_inode_buffers(inode);
-
         BUG_ON(inode->i_data.nrpages);
+        BUG_ON(!list_empty(&inode->i_data.private_list));
         BUG_ON(!(inode->i_state & I_FREEING));
         BUG_ON(inode->i_state & I_CLEAR);
         inode_sync_wait(inode);
-        if (inode->i_sb->s_op->clear_inode)
-                inode->i_sb->s_op->clear_inode(inode);
+        inode->i_state = I_FREEING | I_CLEAR;
+}
+EXPORT_SYMBOL(end_writeback);
+
+static void evict(struct inode *inode)
+{
+        const struct super_operations *op = inode->i_sb->s_op;
+
+        if (op->evict_inode) {
+                op->evict_inode(inode);
+        } else {
+                if (inode->i_data.nrpages)
+                        truncate_inode_pages(&inode->i_data, 0);
+                end_writeback(inode);
+        }
         if (S_ISBLK(inode->i_mode) && inode->i_bdev)
                 bd_forget(inode);
         if (S_ISCHR(inode->i_mode) && inode->i_cdev)
                 cd_forget(inode);
-        inode->i_state = I_CLEAR;
 }
-EXPORT_SYMBOL(clear_inode);
 
 /*
  * dispose_list - dispose of the contents of a local list
@@ -333,9 +335,7 @@ static void dispose_list(struct list_head *head)
                 inode = list_first_entry(head, struct inode, i_list);
                 list_del(&inode->i_list);
 
-                if (inode->i_data.nrpages)
-                        truncate_inode_pages(&inode->i_data, 0);
-                clear_inode(inode);
+                evict(inode);
 
                 spin_lock(&inode_lock);
                 hlist_del_init(&inode->i_hash);
@@ -547,7 +547,7 @@ repeat:
                         continue;
                 if (!test(inode, data))
                         continue;
-                if (inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE)) {
+                if (inode->i_state & (I_FREEING|I_WILL_FREE)) {
                         __wait_on_freeing_inode(inode);
                         goto repeat;
                 }
@@ -572,7 +572,7 @@ repeat:
                         continue;
                 if (inode->i_sb != sb)
                         continue;
-                if (inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE)) {
+                if (inode->i_state & (I_FREEING|I_WILL_FREE)) {
                         __wait_on_freeing_inode(inode);
                         goto repeat;
                 }
@@ -834,7 +834,7 @@ EXPORT_SYMBOL(iunique);
 struct inode *igrab(struct inode *inode)
 {
         spin_lock(&inode_lock);
-        if (!(inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE)))
+        if (!(inode->i_state & (I_FREEING|I_WILL_FREE)))
                 __iget(inode);
         else
                 /*
@@ -1083,7 +1083,7 @@ int insert_inode_locked(struct inode *inode)
                                 continue;
                         if (old->i_sb != sb)
                                 continue;
-                        if (old->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE))
+                        if (old->i_state & (I_FREEING|I_WILL_FREE))
                                 continue;
                         break;
                 }
@@ -1122,7 +1122,7 @@ int insert_inode_locked4(struct inode *inode, unsigned long hashval,
                                 continue;
                         if (!test(old, data))
                                 continue;
-                        if (old->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE))
+                        if (old->i_state & (I_FREEING|I_WILL_FREE))
                                 continue;
                         break;
                 }
@@ -1174,69 +1174,51 @@ void remove_inode_hash(struct inode *inode)
 }
 EXPORT_SYMBOL(remove_inode_hash);
 
+int generic_delete_inode(struct inode *inode)
+{
+        return 1;
+}
+EXPORT_SYMBOL(generic_delete_inode);
+
 /*
- * Tell the filesystem that this inode is no longer of any interest and should
- * be completely destroyed.
- *
- * We leave the inode in the inode hash table until *after* the filesystem's
- * ->delete_inode completes.  This ensures that an iget (such as nfsd might
- * instigate) will always find up-to-date information either in the hash or on
- * disk.
- *
- * I_FREEING is set so that no-one will take a new reference to the inode while
- * it is being deleted.
+ * Normal UNIX filesystem behaviour: delete the
+ * inode when the usage count drops to zero, and
+ * i_nlink is zero.
  */
-void generic_delete_inode(struct inode *inode)
+int generic_drop_inode(struct inode *inode)
 {
-        const struct super_operations *op = inode->i_sb->s_op;
-
-        list_del_init(&inode->i_list);
-        list_del_init(&inode->i_sb_list);
-        WARN_ON(inode->i_state & I_NEW);
-        inode->i_state |= I_FREEING;
-        inodes_stat.nr_inodes--;
-        spin_unlock(&inode_lock);
-
-        if (op->delete_inode) {
-                void (*delete)(struct inode *) = op->delete_inode;
-                /* Filesystems implementing their own
-                 * s_op->delete_inode are required to call
-                 * truncate_inode_pages and clear_inode()
-                 * internally */
-                delete(inode);
-        } else {
-                truncate_inode_pages(&inode->i_data, 0);
-                clear_inode(inode);
-        }
-        spin_lock(&inode_lock);
-        hlist_del_init(&inode->i_hash);
-        spin_unlock(&inode_lock);
-        wake_up_inode(inode);
-        BUG_ON(inode->i_state != I_CLEAR);
-        destroy_inode(inode);
+        return !inode->i_nlink || hlist_unhashed(&inode->i_hash);
 }
-EXPORT_SYMBOL(generic_delete_inode);
+EXPORT_SYMBOL_GPL(generic_drop_inode);
 
-/**
- *      generic_detach_inode - remove inode from inode lists
- *      @inode: inode to remove
- *
- *      Remove inode from inode lists, write it if it's dirty. This is just an
- *      internal VFS helper exported for hugetlbfs. Do not use!
+/*
+ * Called when we're dropping the last reference
+ * to an inode.
  *
- *      Returns 1 if inode should be completely destroyed.
+ * Call the FS "drop_inode()" function, defaulting to
+ * the legacy UNIX filesystem behaviour.  If it tells
+ * us to evict inode, do so.  Otherwise, retain inode
+ * in cache if fs is alive, sync and evict if fs is
+ * shutting down.
  */
-int generic_detach_inode(struct inode *inode)
+static void iput_final(struct inode *inode)
 {
         struct super_block *sb = inode->i_sb;
+        const struct super_operations *op = inode->i_sb->s_op;
+        int drop;
 
-        if (!hlist_unhashed(&inode->i_hash)) {
+        if (op && op->drop_inode)
+                drop = op->drop_inode(inode);
+        else
+                drop = generic_drop_inode(inode);
+
+        if (!drop) {
                 if (!(inode->i_state & (I_DIRTY|I_SYNC)))
                         list_move(&inode->i_list, &inode_unused);
                 inodes_stat.nr_unused++;
                 if (sb->s_flags & MS_ACTIVE) {
                         spin_unlock(&inode_lock);
-                        return 0;
+                        return;
                 }
                 WARN_ON(inode->i_state & I_NEW);
                 inode->i_state |= I_WILL_FREE;
@@ -1254,56 +1236,15 @@ int generic_detach_inode(struct inode *inode)
         inode->i_state |= I_FREEING;
         inodes_stat.nr_inodes--;
         spin_unlock(&inode_lock);
-        return 1;
-}
-EXPORT_SYMBOL_GPL(generic_detach_inode);
-
-static void generic_forget_inode(struct inode *inode)
-{
-        if (!generic_detach_inode(inode))
-                return;
-        if (inode->i_data.nrpages)
-                truncate_inode_pages(&inode->i_data, 0);
-        clear_inode(inode);
+        evict(inode);
+        spin_lock(&inode_lock);
+        hlist_del_init(&inode->i_hash);
+        spin_unlock(&inode_lock);
         wake_up_inode(inode);
+        BUG_ON(inode->i_state != (I_FREEING | I_CLEAR));
         destroy_inode(inode);
 }
 
-/*
- * Normal UNIX filesystem behaviour: delete the
- * inode when the usage count drops to zero, and
- * i_nlink is zero.
- */
-void generic_drop_inode(struct inode *inode)
-{
-        if (!inode->i_nlink)
-                generic_delete_inode(inode);
-        else
-                generic_forget_inode(inode);
-}
-EXPORT_SYMBOL_GPL(generic_drop_inode);
-
-/*
- * Called when we're dropping the last reference
- * to an inode.
- *
- * Call the FS "drop()" function, defaulting to
- * the legacy UNIX filesystem behaviour..
- *
- * NOTE! NOTE! NOTE! We're called with the inode lock
- * held, and the drop function is supposed to release
- * the lock!
- */
-static inline void iput_final(struct inode *inode)
-{
-        const struct super_operations *op = inode->i_sb->s_op;
-        void (*drop)(struct inode *) = generic_drop_inode;
-
-        if (op && op->drop_inode)
-                drop = op->drop_inode;
-        drop(inode);
-}
-
 /**
  *      iput    - put an inode
  *      @inode: inode to put
@@ -1316,7 +1257,7 @@ static inline void iput_final(struct inode *inode)
 void iput(struct inode *inode)
 {
         if (inode) {
-                BUG_ON(inode->i_state == I_CLEAR);
+                BUG_ON(inode->i_state & I_CLEAR);
 
                 if (atomic_dec_and_lock(&inode->i_count, &inode_lock))
                         iput_final(inode);