cifs/smb3: Fix data inconsistent when punch hole

commit acc91c2d8de4ef46ed751c5f9df99ed9a109b100 upstream.

When punch hole success, we also can read old data from file:
  # strace -e trace=pread64,fallocate xfs_io -f -c "pread 20 40" \
           -c "fpunch 20 40" -c"pread 20 40" file
  pread64(3, " version 5.8.0-rc1+"..., 40, 20) = 40
  fallocate(3, FALLOC_FL_KEEP_SIZE|FALLOC_FL_PUNCH_HOLE, 20, 40) = 0
  pread64(3, " version 5.8.0-rc1+"..., 40, 20) = 40

CIFS implements the fallocate(FALLOCATE_FL_PUNCH_HOLE) with send SMB
ioctl(FSCTL_SET_ZERO_DATA) to server. It just set the range of the
remote file to zero, but local page caches not updated, then the
local page caches inconsistent with server.

Also can be found by xfstests generic/316.

So, we need to remove the page caches before send the SMB
ioctl(FSCTL_SET_ZERO_DATA) to server.

Fixes: 31742c5a33176 ("enable fallocate punch hole ("fallocate -p") for SMB3")
Suggested-by: Pavel Shilovsky <pshilov@microsoft.com>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
Signed-off-by: Zhang Xiaoxu <zhangxiaoxu5@huawei.com>
Cc: stable@vger.kernel.org # v3.17
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index f5e893ed48aaa102d92ac872c821c4df91a5c3a5..e38f21c44133d0afe884369aaa1e8c1ca335a932 100644 (file)
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -3036,6 +3036,12 @@ static long smb3_punch_hole(struct file *file, struct cifs_tcon *tcon,
                return rc;
        }
 
+       /*
+        * We implement the punch hole through ioctl, so we need remove the page
+        * caches first, otherwise the data may be inconsistent with the server.
+        */
+       truncate_pagecache_range(inode, offset, offset + len - 1);
+
        cifs_dbg(FYI, "Offset %lld len %lld\n", offset, len);
 
        fsctl_buf.FileOffset = cpu_to_le64(offset);