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CIFS: Fix wrong pos argument of cifs_find_lock_conflict 

and use generic_file_aio_write rather than __generic_file_aio_write
in cifs_writev.

Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru>
Reported-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Steve French <smfrench@gmail.com>
This commit is contained in:
Pavel Shilovsky 2014-02-14 13:31:03 +04:00 committed by Steve French
parent f9b080803e
commit 6b1168e161
1 changed files with 6 additions and 18 deletions
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24
fs/cifs/file.c
View File

@ -2579,31 +2579,19 @@ cifs_writev(struct kiocb *iocb, const struct iovec *iov,
struct cifsInodeInfo *cinode = CIFS_I(inode);
struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server;
ssize_t rc = -EACCES;
loff_t lock_pos = pos;
BUG_ON(iocb->ki_pos != pos);
if (file->f_flags & O_APPEND)
lock_pos = i_size_read(inode);
/*
* We need to hold the sem to be sure nobody modifies lock list
* with a brlock that prevents writing.
*/
down_read(&cinode->lock_sem);
if (!cifs_find_lock_conflict(cfile, pos, iov_length(iov, nr_segs),
if (!cifs_find_lock_conflict(cfile, lock_pos, iov_length(iov, nr_segs),
server->vals->exclusive_lock_type, NULL,
CIFS_WRITE_OP)) {
mutex_lock(&inode->i_mutex);
rc = __generic_file_aio_write(iocb, iov, nr_segs,
&iocb->ki_pos);
mutex_unlock(&inode->i_mutex);
}
if (rc > 0) {
ssize_t err;
err = generic_write_sync(file, iocb->ki_pos - rc, rc);
if (err < 0)
rc = err;
}
CIFS_WRITE_OP))
rc = generic_file_aio_write(iocb, iov, nr_segs, pos);
up_read(&cinode->lock_sem);
return rc;
}