Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Index: linux-2.6/fs/inode.c
===================================================================
--- linux-2.6.orig/fs/inode.c 2010-10-24 16:31:49.000000000 +0200
+++ linux-2.6/fs/inode.c 2010-10-24 16:32:20.609254420 +0200
@@ -477,15 +477,24 @@ static void dispose_list(struct list_hea
}
}
-/*
- * Invalidate all inodes for a device.
+/**
+ * invalidate_inodes - attempt to free all inodes on a superblock
+ * @sb: superblock to operate on
+ *
+ * Attempts to free all inodes for a given superblock. If there were any
+ * busy inodes return a non-zero value, else zero.
*/
-static int invalidate_list(struct list_head *head, struct list_head *dispose)
+int invalidate_inodes(struct super_block *sb)
{
- struct inode *inode, *next;
int busy = 0;
+ struct inode *inode, *next;
+ LIST_HEAD(dispose);
- list_for_each_entry_safe(inode, next, head, i_sb_list) {
+ down_write(&iprune_sem);
+
+ spin_lock(&inode_lock);
+ fsnotify_unmount_inodes(&sb->s_inodes);
+ list_for_each_entry_safe(inode, next, &sb->s_inodes, i_sb_list) {
if (inode->i_state & I_NEW)
continue;
if (atomic_read(&inode->i_count)) {
@@ -499,34 +508,14 @@ static int invalidate_list(struct list_h
* Move the inode off the IO lists and LRU once I_FREEING is
* set so that it won't get moved back on there if it is dirty.
*/
- list_move(&inode->i_lru, dispose);
+ list_move(&inode->i_lru, &dispose);
list_del_init(&inode->i_wb_list);
if (!(inode->i_state & (I_DIRTY | I_SYNC)))
percpu_counter_dec(&nr_inodes_unused);
}
- return busy;
-}
-
-/**
- * invalidate_inodes - discard the inodes on a device
- * @sb: superblock
- *
- * Discard all of the inodes for a given superblock. If the discard
- * fails because there are busy inodes then a non zero value is returned.
- * If the discard is successful all the inodes have been discarded.
- */
-int invalidate_inodes(struct super_block *sb)
-{
- int busy;
- LIST_HEAD(throw_away);
-
- down_write(&iprune_sem);
- spin_lock(&inode_lock);
- fsnotify_unmount_inodes(&sb->s_inodes);
- busy = invalidate_list(&sb->s_inodes, &throw_away);
spin_unlock(&inode_lock);
- dispose_list(&throw_away);
+ dispose_list(&dispose);
up_write(&iprune_sem);
return busy;
--
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