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reiserfs: call truncate_setsize under tailpack mutex

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commit 22e7478ddb upstream.

Prior to commit 0e4f6a791b (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>
This commit is contained in:
Jeff Mahoney 2014-05-21 13:28:07 -04:00 committed by Greg Kroah-Hartman
parent 008643fecc
commit 3d8e24ef90
1 changed files with 7 additions and 1 deletions
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8
fs/reiserfs/inode.c
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@ -3220,8 +3220,14 @@ 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);
}
}