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authorJeff Mahoney <jeffm@suse.com>2014-05-21 13:28:07 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-07-06 18:54:15 -0700
commit4660efb843558ced86491e8582da9b671280952c (patch)
tree92fa46da3e3e9557ea5d3044a6bde46141cd9631
parent18f5426fb7f2be5e3112ed301b52e2ea92d3e3cd (diff)
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reiserfs: call truncate_setsize under tailpack mutex
commit 22e7478ddbcb670e33fab72d0bbe7c394c3a2c84 upstream. Prior to commit 0e4f6a791b1e (Fix reiserfs_file_release()), reiserfs truncates serialized on i_mutex. They mostly still do, with the exception of reiserfs_file_release. That blocks out other writers via the tailpack mutex and the inode openers counter adjusted in reiserfs_file_open. However, NFS will call reiserfs_setattr without having called ->open, so we end up with a race when nfs is calling ->setattr while another process is releasing the file. Ultimately, it triggers the BUG_ON(inode->i_size != new_file_size) check in maybe_indirect_to_direct. The solution is to pull the lock into reiserfs_setattr to encompass the truncate_setsize call as well. Signed-off-by: Jeff Mahoney <jeffm@suse.com> Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--fs/reiserfs/inode.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/fs/reiserfs/inode.c b/fs/reiserfs/inode.c
index f844533792e..36166443bc4 100644
--- a/fs/reiserfs/inode.c
+++ b/fs/reiserfs/inode.c
@@ -3211,8 +3211,14 @@ int reiserfs_setattr(struct dentry *dentry, struct iattr *attr)
attr->ia_size != i_size_read(inode)) {
error = inode_newsize_ok(inode, attr->ia_size);
if (!error) {
+ /*
+ * Could race against reiserfs_file_release
+ * if called from NFS, so take tailpack mutex.
+ */
+ mutex_lock(&REISERFS_I(inode)->tailpack);
truncate_setsize(inode, attr->ia_size);
- reiserfs_vfs_truncate_file(inode);
+ reiserfs_truncate_file(inode, 1);
+ mutex_unlock(&REISERFS_I(inode)->tailpack);
}
}