From 22e7478ddbcb670e33fab72d0bbe7c394c3a2c84 Mon Sep 17 00:00:00 2001 From: Jeff Mahoney Date: Wed, 21 May 2014 13:28:07 -0400 Subject: reiserfs: call truncate_setsize under tailpack mutex 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 Cc: Signed-off-by: Jan Kara --- fs/reiserfs/inode.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) (limited to 'fs') diff --git a/fs/reiserfs/inode.c b/fs/reiserfs/inode.c index 874c8b329cfe..e3ca04894919 100644 --- a/fs/reiserfs/inode.c +++ b/fs/reiserfs/inode.c @@ -3422,8 +3422,14 @@ 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); } } -- cgit v1.2.3