X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=fs%2Finode.c;h=26cdb115ce67d5361222d39cf5e94039db654eec;hb=af60496f746596fdbc7a9ffa1a96f97e1bc59bcf;hp=f42961eb983b476f66e591939e42450eb64641d0;hpb=9f2fa466383ce100b90fe52cb4489d7a26bf72a9;p=linux-2.6

diff --git a/fs/inode.c b/fs/inode.c
index f42961eb98..26cdb115ce 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -4,7 +4,6 @@
  * (C) 1997 Linus Torvalds
  */
 
-#include <linux/config.h>
 #include <linux/fs.h>
 #include <linux/mm.h>
 #include <linux/dcache.h>
@@ -134,7 +133,6 @@ static struct inode *alloc_inode(struct super_block *sb)
 		inode->i_bdev = NULL;
 		inode->i_cdev = NULL;
 		inode->i_rdev = 0;
-		inode->i_security = NULL;
 		inode->dirtied_when = 0;
 		if (security_inode_alloc(inode)) {
 			if (inode->i_sb->s_op->destroy_inode)
@@ -164,7 +162,7 @@ static struct inode *alloc_inode(struct super_block *sb)
 				bdi = sb->s_bdev->bd_inode->i_mapping->backing_dev_info;
 			mapping->backing_dev_info = bdi;
 		}
-		memset(&inode->u, 0, sizeof(inode->u));
+		inode->i_private = NULL;
 		inode->i_mapping = mapping;
 	}
 	return inode;
@@ -255,9 +253,9 @@ void clear_inode(struct inode *inode)
 	DQUOT_DROP(inode);
 	if (inode->i_sb && inode->i_sb->s_op->clear_inode)
 		inode->i_sb->s_op->clear_inode(inode);
-	if (inode->i_bdev)
+	if (S_ISBLK(inode->i_mode) && inode->i_bdev)
 		bd_forget(inode);
-	if (inode->i_cdev)
+	if (S_ISCHR(inode->i_mode) && inode->i_cdev)
 		cd_forget(inode);
 	inode->i_state = I_CLEAR;
 }
@@ -364,27 +362,6 @@ int invalidate_inodes(struct super_block * sb)
 }
 
 EXPORT_SYMBOL(invalidate_inodes);
- 
-int __invalidate_device(struct block_device *bdev)
-{
-	struct super_block *sb = get_super(bdev);
-	int res = 0;
-
-	if (sb) {
-		/*
-		 * no need to lock the super, get_super holds the
-		 * read mutex so the filesystem cannot go away
-		 * under us (->put_super runs with the write lock
-		 * hold).
-		 */
-		shrink_dcache_sb(sb);
-		res = invalidate_inodes(sb);
-		drop_super(sb);
-	}
-	invalidate_bdev(bdev, 0);
-	return res;
-}
-EXPORT_SYMBOL(__invalidate_device);
 
 static int can_unuse(struct inode *inode)
 {
@@ -452,15 +429,14 @@ static void prune_icache(int nr_to_scan)
 		nr_pruned++;
 	}
 	inodes_stat.nr_unused -= nr_pruned;
+	if (current_is_kswapd())
+		__count_vm_events(KSWAPD_INODESTEAL, reap);
+	else
+		__count_vm_events(PGINODESTEAL, reap);
 	spin_unlock(&inode_lock);
 
 	dispose_list(&freeable);
 	mutex_unlock(&iprune_mutex);
-
-	if (current_is_kswapd())
-		mod_page_state(kswapd_inodesteal, reap);
-	else
-		mod_page_state(pginodesteal, reap);
 }
 
 /*
@@ -681,7 +657,7 @@ static struct inode * get_new_inode_fast(struct super_block *sb, struct hlist_he
 	return inode;
 }
 
-static inline unsigned long hash(struct super_block *sb, unsigned long hashval)
+static unsigned long hash(struct super_block *sb, unsigned long hashval)
 {
 	unsigned long tmp;
 
@@ -1027,7 +1003,7 @@ void generic_delete_inode(struct inode *inode)
 
 	list_del_init(&inode->i_list);
 	list_del_init(&inode->i_sb_list);
-	inode->i_state|=I_FREEING;
+	inode->i_state |= I_FREEING;
 	inodes_stat.nr_inodes--;
 	spin_unlock(&inode_lock);
 
@@ -1234,13 +1210,15 @@ void file_update_time(struct file *file)
 		return;
 
 	now = current_fs_time(inode->i_sb);
-	if (!timespec_equal(&inode->i_mtime, &now))
+	if (!timespec_equal(&inode->i_mtime, &now)) {
+		inode->i_mtime = now;
 		sync_it = 1;
-	inode->i_mtime = now;
+	}
 
-	if (!timespec_equal(&inode->i_ctime, &now))
+	if (!timespec_equal(&inode->i_ctime, &now)) {
+		inode->i_ctime = now;
 		sync_it = 1;
-	inode->i_ctime = now;
+	}
 
 	if (sync_it)
 		mark_inode_dirty_sync(inode);
@@ -1328,6 +1306,42 @@ void wake_up_inode(struct inode *inode)
 	wake_up_bit(&inode->i_state, __I_LOCK);
 }
 
+/*
+ * We rarely want to lock two inodes that do not have a parent/child
+ * relationship (such as directory, child inode) simultaneously. The
+ * vast majority of file systems should be able to get along fine
+ * without this. Do not use these functions except as a last resort.
+ */
+void inode_double_lock(struct inode *inode1, struct inode *inode2)
+{
+	if (inode1 == NULL || inode2 == NULL || inode1 == inode2) {
+		if (inode1)
+			mutex_lock(&inode1->i_mutex);
+		else if (inode2)
+			mutex_lock(&inode2->i_mutex);
+		return;
+	}
+
+	if (inode1 < inode2) {
+		mutex_lock_nested(&inode1->i_mutex, I_MUTEX_PARENT);
+		mutex_lock_nested(&inode2->i_mutex, I_MUTEX_CHILD);
+	} else {
+		mutex_lock_nested(&inode2->i_mutex, I_MUTEX_PARENT);
+		mutex_lock_nested(&inode1->i_mutex, I_MUTEX_CHILD);
+	}
+}
+EXPORT_SYMBOL(inode_double_lock);
+
+void inode_double_unlock(struct inode *inode1, struct inode *inode2)
+{
+	if (inode1)
+		mutex_unlock(&inode1->i_mutex);
+
+	if (inode2 && inode2 != inode1)
+		mutex_unlock(&inode2->i_mutex);
+}
+EXPORT_SYMBOL(inode_double_unlock);
+
 static __initdata unsigned long ihash_entries;
 static int __init set_ihash_entries(char *str)
 {