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Subject[PATCH 5.7 085/265] cifs/smb3: Fix data inconsistent when zero file range
From: Zhang Xiaoxu <>

commit 6b69040247e14b43419a520f841f2b3052833df9 upstream.

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 <>
Signed-off-by: Zhang Xiaoxu <>
Reviewed-by: Pavel Shilovsky <>
Cc: # v3.17
Signed-off-by: Steve French <>
Signed-off-by: Greg Kroah-Hartman <>
fs/cifs/smb2ops.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index 3de9113eb8e35..6fc69c3b2749d 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -3145,6 +3145,11 @@ 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))
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