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authorZhang Xiaoxu <zhangxiaoxu5@huawei.com>2020-06-23 07:31:54 -0400
committerSteve French <stfrench@microsoft.com>2020-06-23 19:06:27 -0500
commit6b69040247e14b43419a520f841f2b3052833df9 (patch)
tree473eee7d8e62c8363b22aa944142c7ce2ee6c2a5 /fs
parent95a3d8f3af9b0d63b43f221b630beaab9739d13a (diff)
cifs/smb3: Fix data inconsistent when zero file range
CIFS implements the fallocate(FALLOC_FL_ZERO_RANGE) with send SMB ioctl(FSCTL_SET_ZERO_DATA) to server. It just set the range of the remote file to zero, but local page cache not update, then the data inconsistent with server, which leads the xfstest generic/008 failed. So we need to remove the local page caches before send SMB ioctl(FSCTL_SET_ZERO_DATA) to server. After next read, it will re-cache it. Fixes: 30175628bf7f5 ("[SMB3] Enable fallocate -z support for SMB3 mounts") Reported-by: Hulk Robot <hulkci@huawei.com> Signed-off-by: Zhang Xiaoxu <zhangxiaoxu5@huawei.com> Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com> Cc: stable@vger.kernel.org # v3.17 Signed-off-by: Steve French <stfrench@microsoft.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/cifs/smb2ops.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index 28553d45604e..876a0d9e3d46 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -3188,6 +3188,11 @@ static long smb3_zero_range(struct file *file, struct cifs_tcon *tcon,
trace_smb3_zero_enter(xid, cfile->fid.persistent_fid, tcon->tid,
ses->Suid, offset, len);
+ /*
+ * We zero the range 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);
/* if file not oplocked can't be sure whether asking to extend size */
if (!CIFS_CACHE_READ(cifsi))