[PATCH] bugfix: two read_inode() calls without clear_inode() call between

Bug symptoms
~~~~~~~~~~~~
For the same inode VFS calls read_inode() twice and doesn't call
clear_inode() between the two read_inode() invocations.

Bug description
~~~~~~~~~~~~~~~
Suppose we have an inode which has zero reference count but is still in
the inode cache. Suppose kswapd invokes shrink_icache_memory() to free
some RAM. In prune_icache() inodes are removed from i_hash. prune_icache
() is then going to call clear_inode(), but drops the inode_lock
spinlock before this. If in this moment another task calls iget() for an
inode which was just removed from i_hash by prune_icache(), then iget()
invokes read_inode() for this inode, because it is *already removed*
from i_hash.

The end result is: we call iget(#N) then iput(#N); inode #N has zero
i_count now and is in the inode cache; kswapd starts. kswapd removes the
inode #N from i_hash ans is preempted; we call iget(#N) again;
read_inode() is invoked as the result; but we expect clear_inode()
before.

Fix
~~~~~~~
To fix the bug I remove inodes from i_hash later, when clear_inode() is
actually called. I remove them from i_hash under spinlock protection.
Since the i_state is set to I_FREEING, it is safe to do this. The others
will sleep waiting for the inode state change.

I also postpone removing inodes from i_sb_list. It is not compulsory to
do so but I do it for readability reasons. Inodes are added/removed to
the lists together everywhere in the code and there is no point to
change this rule. This is harmless because the only user of i_sb_list
which somehow may interfere with me (invalidate_list()) is excluded by
the iprune_sem mutex.

The same race is possible in invalidate_list() so I do the same for it.

Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/fs/inode.c b/fs/inode.c
index 0116d06..5bc9750 100644 (file)
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -282,6 +282,13 @@ static void dispose_list(struct list_head *head)
                if (inode->i_data.nrpages)
                        truncate_inode_pages(&inode->i_data, 0);
                clear_inode(inode);
+
+               spin_lock(&inode_lock);
+               hlist_del_init(&inode->i_hash);
+               list_del_init(&inode->i_sb_list);
+               spin_unlock(&inode_lock);
+
+               wake_up_inode(inode);
                destroy_inode(inode);
                nr_disposed++;
        }
@@ -317,8 +324,6 @@ static int invalidate_list(struct list_head *head, struct list_head *dispose)
                inode = list_entry(tmp, struct inode, i_sb_list);
                invalidate_inode_buffers(inode);
                if (!atomic_read(&inode->i_count)) {
-                       hlist_del_init(&inode->i_hash);
-                       list_del(&inode->i_sb_list);
                        list_move(&inode->i_list, dispose);
                        inode->i_state |= I_FREEING;
                        count++;
@@ -439,8 +444,6 @@ static void prune_icache(int nr_to_scan)
                        if (!can_unuse(inode))
                                continue;
                }
-               hlist_del_init(&inode->i_hash);
-               list_del_init(&inode->i_sb_list);
                list_move(&inode->i_list, &freeable);
                inode->i_state |= I_FREEING;
                nr_pruned++;