diff options
Diffstat (limited to 'fs/cifs/smb2pdu.c')
| -rw-r--r-- | fs/cifs/smb2pdu.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c index 34d5397a1989..f58e4dc3987b 100644 --- a/fs/cifs/smb2pdu.c +++ b/fs/cifs/smb2pdu.c @@ -2118,6 +2118,48 @@ add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp) return 0; } +static struct crt_query_id_ctxt * +create_query_id_buf(void) +{ + struct crt_query_id_ctxt *buf; + + buf = kzalloc(sizeof(struct crt_query_id_ctxt), GFP_KERNEL); + if (!buf) + return NULL; + + buf->ccontext.DataOffset = cpu_to_le16(0); + buf->ccontext.DataLength = cpu_to_le32(0); + buf->ccontext.NameOffset = cpu_to_le16(offsetof + (struct crt_query_id_ctxt, Name)); + buf->ccontext.NameLength = cpu_to_le16(4); + /* SMB2_CREATE_QUERY_ON_DISK_ID is "QFid" */ + buf->Name[0] = 'Q'; + buf->Name[1] = 'F'; + buf->Name[2] = 'i'; + buf->Name[3] = 'd'; + return buf; +} + +/* See MS-SMB2 2.2.13.2.9 */ +static int +add_query_id_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_query_id_buf(); + if (iov[num].iov_base == NULL) + return -ENOMEM; + iov[num].iov_len = sizeof(struct crt_query_id_ctxt); + if (!req->CreateContextsOffset) + req->CreateContextsOffset = cpu_to_le32( + sizeof(struct smb2_create_req) + + iov[num - 1].iov_len); + le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_query_id_ctxt)); + *num_iovec = num + 1; + return 0; +} + static int alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len, const char *treename, const __le16 *path) @@ -2446,6 +2488,12 @@ SMB2_open_init(struct cifs_tcon *tcon, struct smb_rqst *rqst, __u8 *oplock, return rc; } + if (n_iov > 2) { + struct create_context *ccontext = + (struct create_context *)iov[n_iov-1].iov_base; + ccontext->Next = cpu_to_le32(iov[n_iov-1].iov_len); + } + add_query_id_context(iov, &n_iov); rqst->rq_nvec = n_iov; return 0; |