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authorPavel Shilovsky <piastry@etersoft.ru>2014-02-14 10:31:03 +0100
committerSteve French <smfrench@gmail.com>2014-02-24 03:54:50 +0100
commit6b1168e1617d9d4db73ef5276490627abf5adec4 (patch)
tree0f1d310e6249e84edbed94bebb96b2f057fa1b41 /fs/cifs
parentMerge tag 'usb-3.14-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gre... (diff)
downloadlinux-6b1168e1617d9d4db73ef5276490627abf5adec4.tar.xz
linux-6b1168e1617d9d4db73ef5276490627abf5adec4.zip
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>
Diffstat (limited to 'fs/cifs')
-rw-r--r--fs/cifs/file.c24
1 files changed, 6 insertions, 18 deletions
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 53c15074bb36..834fce759d80 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -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;
}