| From | Sasha Levin <> | Subject | [PATCH 4.9 160/191] cifs/smb3: Fix data inconsistent when zero file range | Date | Mon, 29 Jun 2020 11:39:36 -0400 |
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From: Zhang Xiaoxu <zhangxiaoxu5@huawei.com>
[ Upstream commit 6b69040247e14b43419a520f841f2b3052833df9 ]
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> Signed-off-by: Sasha Levin <sashal@kernel.org> --- fs/cifs/smb2ops.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c index 9c29317deef56..edd4c7292be00 100644 --- a/fs/cifs/smb2ops.c +++ b/fs/cifs/smb2ops.c @@ -1220,6 +1220,12 @@ static long smb3_zero_range(struct file *file, struct cifs_tcon *tcon, inode = d_inode(cfile->dentry); cifsi = CIFS_I(inode); + /* + * 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)) if (keep_size == false) -- 2.25.1
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