diff options
author | Josef Bacik <josef@redhat.com> | 2009-11-11 20:53:34 (GMT) |
---|---|---|
committer | Chris Mason <chris.mason@oracle.com> | 2009-11-11 20:53:34 (GMT) |
commit | a6dbd429d8dd3382bbd9594b8d2ec74843a260d9 (patch) | |
tree | 9cc6426da748996e4e1cc61d446052838703434f /fs | |
parent | 33b258086441dd07e00133c79fcd8cbc6a76d737 (diff) | |
download | linux-fsl-qoriq-a6dbd429d8dd3382bbd9594b8d2ec74843a260d9.tar.xz |
Btrfs: fix panic when trying to destroy a newly allocated
There is a problem where iget5_locked will look for an inode, not find it, and
then subsequently try to allocate it. Another CPU will have raced in and
allocated the inode instead, so when iget5_locked gets the inode spin lock again
and does a search, it finds the new inode. So it goes ahead and calls
destroy_inode on the inode it just allocated. The problem is we don't set
BTRFS_I(inode)->root until the new inode is completely initialized. This patch
makes us set root to NULL when alloc'ing a new inode, so when we get to
btrfs_destroy_inode and we see that root is NULL we can just free up the memory
and continue on. This fixes the panic
http://www.kerneloops.org/submitresult.php?number=812690
Thanks,
Signed-off-by: Josef Bacik <josef@redhat.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs')
-rw-r--r-- | fs/btrfs/inode.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index d3d7d46..ee92801 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -5180,6 +5180,7 @@ struct inode *btrfs_alloc_inode(struct super_block *sb) ei->logged_trans = 0; ei->outstanding_extents = 0; ei->reserved_extents = 0; + ei->root = NULL; spin_lock_init(&ei->accounting_lock); btrfs_ordered_inode_tree_init(&ei->ordered_tree); INIT_LIST_HEAD(&ei->i_orphan); @@ -5196,6 +5197,14 @@ void btrfs_destroy_inode(struct inode *inode) WARN_ON(inode->i_data.nrpages); /* + * This can happen where we create an inode, but somebody else also + * created the same inode and we need to destroy the one we already + * created. + */ + if (!root) + goto free; + + /* * Make sure we're properly removed from the ordered operation * lists. */ @@ -5230,6 +5239,7 @@ void btrfs_destroy_inode(struct inode *inode) } inode_tree_del(inode); btrfs_drop_extent_cache(inode, 0, (u64)-1, 0); +free: kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); } |