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Diffstat (limited to 'fs/cifs/smb2pdu.c')
-rw-r--r--fs/cifs/smb2pdu.c49
1 files changed, 33 insertions, 16 deletions
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 21ac19ff19cb..21ad01d55ab2 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -1002,7 +1002,8 @@ int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
- (char *)pneg_inbuf, inbuflen, (char **)&pneg_rsp, &rsplen);
+ (char *)pneg_inbuf, inbuflen, CIFSMaxBufSize,
+ (char **)&pneg_rsp, &rsplen);
if (rc == -EOPNOTSUPP) {
/*
* Old Windows versions or Netapp SMB server can return
@@ -1858,8 +1859,9 @@ add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
}
static struct create_durable_v2 *
-create_durable_v2_buf(struct cifs_fid *pfid)
+create_durable_v2_buf(struct cifs_open_parms *oparms)
{
+ struct cifs_fid *pfid = oparms->fid;
struct create_durable_v2 *buf;
buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
@@ -1873,7 +1875,14 @@ create_durable_v2_buf(struct cifs_fid *pfid)
(struct create_durable_v2, Name));
buf->ccontext.NameLength = cpu_to_le16(4);
- buf->dcontext.Timeout = 0; /* Should this be configurable by workload */
+ /*
+ * NB: Handle timeout defaults to 0, which allows server to choose
+ * (most servers default to 120 seconds) and most clients default to 0.
+ * This can be overridden at mount ("handletimeout=") if the user wants
+ * a different persistent (or resilient) handle timeout for all opens
+ * opens on a particular SMB3 mount.
+ */
+ buf->dcontext.Timeout = cpu_to_le32(oparms->tcon->handle_timeout);
buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
generate_random_uuid(buf->dcontext.CreateGuid);
memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
@@ -1926,7 +1935,7 @@ add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
struct smb2_create_req *req = iov[0].iov_base;
unsigned int num = *num_iovec;
- iov[num].iov_base = create_durable_v2_buf(oparms->fid);
+ iov[num].iov_base = create_durable_v2_buf(oparms);
if (iov[num].iov_base == NULL)
return -ENOMEM;
iov[num].iov_len = sizeof(struct create_durable_v2);
@@ -2478,7 +2487,8 @@ creat_exit:
int
SMB2_ioctl_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
u64 persistent_fid, u64 volatile_fid, u32 opcode,
- bool is_fsctl, char *in_data, u32 indatalen)
+ bool is_fsctl, char *in_data, u32 indatalen,
+ __u32 max_response_size)
{
struct smb2_ioctl_req *req;
struct kvec *iov = rqst->rq_iov;
@@ -2520,16 +2530,21 @@ SMB2_ioctl_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
req->OutputCount = 0; /* MBZ */
/*
- * Could increase MaxOutputResponse, but that would require more
- * than one credit. Windows typically sets this smaller, but for some
+ * In most cases max_response_size is set to 16K (CIFSMaxBufSize)
+ * We Could increase default MaxOutputResponse, but that could require
+ * more credits. Windows typically sets this smaller, but for some
* ioctls it may be useful to allow server to send more. No point
* limiting what the server can send as long as fits in one credit
- * Unfortunately - we can not handle more than CIFS_MAX_MSG_SIZE
- * (by default, note that it can be overridden to make max larger)
- * in responses (except for read responses which can be bigger.
- * We may want to bump this limit up
+ * We can not handle more than CIFS_MAX_BUF_SIZE yet but may want
+ * to increase this limit up in the future.
+ * Note that for snapshot queries that servers like Azure expect that
+ * the first query be minimal size (and just used to get the number/size
+ * of previous versions) so response size must be specified as EXACTLY
+ * sizeof(struct snapshot_array) which is 16 when rounded up to multiple
+ * of eight bytes. Currently that is the only case where we set max
+ * response size smaller.
*/
- req->MaxOutputResponse = cpu_to_le32(CIFSMaxBufSize);
+ req->MaxOutputResponse = cpu_to_le32(max_response_size);
if (is_fsctl)
req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
@@ -2550,13 +2565,14 @@ SMB2_ioctl_free(struct smb_rqst *rqst)
cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
}
+
/*
* SMB2 IOCTL is used for both IOCTLs and FSCTLs
*/
int
SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
u64 volatile_fid, u32 opcode, bool is_fsctl,
- char *in_data, u32 indatalen,
+ char *in_data, u32 indatalen, u32 max_out_data_len,
char **out_data, u32 *plen /* returned data len */)
{
struct smb_rqst rqst;
@@ -2593,8 +2609,8 @@ SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
rqst.rq_iov = iov;
rqst.rq_nvec = SMB2_IOCTL_IOV_SIZE;
- rc = SMB2_ioctl_init(tcon, &rqst, persistent_fid, volatile_fid,
- opcode, is_fsctl, in_data, indatalen);
+ rc = SMB2_ioctl_init(tcon, &rqst, persistent_fid, volatile_fid, opcode,
+ is_fsctl, in_data, indatalen, max_out_data_len);
if (rc)
goto ioctl_exit;
@@ -2672,7 +2688,8 @@ SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
FSCTL_SET_COMPRESSION, true /* is_fsctl */,
(char *)&fsctl_input /* data input */,
- 2 /* in data len */, &ret_data /* out data */, NULL);
+ 2 /* in data len */, CIFSMaxBufSize /* max out data */,
+ &ret_data /* out data */, NULL);
cifs_dbg(FYI, "set compression rc %d\n", rc);