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fs: fix buffer invalidation in invalidate_list 

We must not call invalidate_inode_buffers in invalidate_list unless the
inode can be reclaimed.  If we remove the buffer association of a busy
inode fsync won't find the buffers anymore.  As invalidate_inode_buffers
is called from various others sources than umount this actually does
matter in practice.

While at it change the loop to a more natural form and remove the
WARN_ON for I_NEW, wich we already tested a few lines above.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Christoph Hellwig 2010-10-23 19:07:20 +02:00 committed by Al Viro
parent 4d4eb36679
commit 99a3891924
1 changed files with 7 additions and 9 deletions
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16
fs/inode.c
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@ -28,7 +28,6 @@
/*
* This is needed for the following functions:
* - inode_has_buffers
* - invalidate_inode_buffers
* - invalidate_bdev
*
* FIXME: remove all knowledge of the buffer layer from this file
@ -503,16 +502,15 @@ static int invalidate_list(struct list_head *head, struct list_head *dispose)
inode = list_entry(tmp, struct inode, i_sb_list);
if (inode->i_state & I_NEW)
continue;
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;
if (!(inode->i_state & (I_DIRTY | I_SYNC)))
percpu_counter_dec(&nr_inodes_unused);
if (atomic_read(&inode->i_count)) {
busy = 1;
continue;
}
busy = 1;
list_move(&inode->i_list, dispose);
inode->i_state |= I_FREEING;
if (!(inode->i_state & (I_DIRTY | I_SYNC)))
percpu_counter_dec(&nr_inodes_unused);
}
return busy;
}