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Subject[patch] fs: new inode i_state corruption fix

There was a report of a data corruption http://lkml.org/lkml/2008/11/14/121.
There is a script included to reproduce the problem.

During testing, I encountered a number of strange things with ext3, so I
tried ext2 to attempt to reduce complexity of the problem. I found that
fsstress would quickly hang in wait_on_inode, waiting for I_LOCK to be
cleared, even though instrumentation showed that unlock_new_inode had
already been called for that inode. This points to memory scribble, or
synchronisation problme.

i_state of I_NEW inodes is not protected by inode_lock because other
processes are not supposed to touch them until I_LOCK (and I_NEW) is
cleared. Adding WARN_ON(inode->i_state & I_NEW) to sites where we modify
i_state revealed that generic_sync_sb_inodes is picking up new inodes
from the inode lists and passing them to __writeback_single_inode without
waiting for I_NEW. Subsequently modifying i_state causes corruption. In
my case it would look like this:

CPU0 CPU1
unlock_new_inode() __sync_single_inode()
reg <- inode->i_state
reg -> reg & ~(I_LOCK|I_NEW) reg <- inode->i_state
reg -> inode->i_state reg -> reg | I_SYNC
reg -> inode->i_state
Non-atomic RMW on CPU1 overwrites CPU0 store and sets I_LOCK|I_NEW again.
Fix for this is rather than wait for I_NEW inodes, just skip over them:
inodes concurrently being created are not subject to data integrity
operations, and should not significantly contribute to dirty memory either.

After this change, I'm unable to reproduce any of the added warnings or hangs
after ~1hour of running. Previously, the new warnings would start immediately
and hang would happen in under 5 minutes.

I'm also testing on ext3 now, and so far no problems there either. I don't
know whether this fixes the problem reported above, but it fixes a real
problem for me.

Cc: "Jorge Boncompte [DTI2]" <jorge@dti2.net>
Cc: Adrian Hunter <ext-adrian.hunter@nokia.com>
Cc: Jan Kara <jack@suse.cz>
Cc: stable@kernel.org
Signed-off-by: Nick Piggin <npiggin@suse.de>

Index: linux-2.6/fs/inode.c
===================================================================
--- linux-2.6.orig/fs/inode.c 2009-03-05 14:08:11.000000000 +1100
+++ linux-2.6/fs/inode.c 2009-03-05 17:20:35.000000000 +1100
@@ -359,6 +359,7 @@ static int invalidate_list(struct list_h
invalidate_inode_buffers(inode);
if (!atomic_read(&inode->i_count)) {
list_move(&inode->i_list, dispose);
+ WARN_ON(inode->i_state & I_NEW);
inode->i_state |= I_FREEING;
count++;
continue;
@@ -460,6 +461,7 @@ static void prune_icache(int nr_to_scan)
continue;
}
list_move(&inode->i_list, &freeable);
+ WARN_ON(inode->i_state & I_NEW);
inode->i_state |= I_FREEING;
nr_pruned++;
}
@@ -656,6 +658,7 @@ void unlock_new_inode(struct inode *inod
* just created it (so there can be no old holders
* that haven't tested I_LOCK).
*/
+ WARN_ON((inode->i_state & (I_LOCK|I_NEW)) != (I_LOCK|I_NEW));
inode->i_state &= ~(I_LOCK|I_NEW);
wake_up_inode(inode);
}
@@ -1145,6 +1148,7 @@ void generic_delete_inode(struct inode *

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);
@@ -1186,16 +1190,19 @@ static void generic_forget_inode(struct
spin_unlock(&inode_lock);
return;
}
+ WARN_ON(inode->i_state & I_NEW);
inode->i_state |= I_WILL_FREE;
spin_unlock(&inode_lock);
write_inode_now(inode, 1);
spin_lock(&inode_lock);
+ WARN_ON(inode->i_state & I_NEW);
inode->i_state &= ~I_WILL_FREE;
inodes_stat.nr_unused--;
hlist_del_init(&inode->i_hash);
}
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);
Index: linux-2.6/fs/fs-writeback.c
===================================================================
--- linux-2.6.orig/fs/fs-writeback.c 2009-03-05 16:33:22.000000000 +1100
+++ linux-2.6/fs/fs-writeback.c 2009-03-05 17:17:59.000000000 +1100
@@ -274,6 +274,7 @@ __sync_single_inode(struct inode *inode,
int ret;

BUG_ON(inode->i_state & I_SYNC);
+ WARN_ON(inode->i_state & I_NEW);

/* Set I_SYNC, reset I_DIRTY */
dirty = inode->i_state & I_DIRTY;
@@ -298,6 +299,7 @@ __sync_single_inode(struct inode *inode,
}

spin_lock(&inode_lock);
+ WARN_ON(inode->i_state & I_NEW);
inode->i_state &= ~I_SYNC;
if (!(inode->i_state & I_FREEING)) {
if (!(inode->i_state & I_DIRTY) &&
@@ -470,6 +472,11 @@ void generic_sync_sb_inodes(struct super
break;
}

+ if (inode->i_state & I_NEW) {
+ requeue_io(inode);
+ continue;
+ }
+
if (wbc->nonblocking && bdi_write_congested(bdi)) {
wbc->encountered_congestion = 1;
if (!sb_is_blkdev_sb(sb))
@@ -531,7 +538,7 @@ void generic_sync_sb_inodes(struct super
list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
struct address_space *mapping;

- if (inode->i_state & (I_FREEING|I_WILL_FREE))
+ if (inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW))
continue;
mapping = inode->i_mapping;
if (mapping->nrpages == 0)

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