Query device characteristics at mount time from server on SMB2/3 not just on cifs mounts
Currently SMB2 and SMB3 mounts do not query the device information at mount time
from the server as is done for cifs. These can be useful for debugging.
This is a minor patch, that extends the previous one (which added ability to
query file system attributes at mount time - this returns the device
characteristics - also via in /proc/fs/cifs/DebugData)
Signed-off-by: Steve French <smfrench@gmail.com>
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index df12cf8..7887cf5 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -2358,17 +2358,27 @@
int
SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
- u64 persistent_fid, u64 volatile_fid)
+ u64 persistent_fid, u64 volatile_fid, int level)
{
struct smb2_query_info_rsp *rsp = NULL;
struct kvec iov;
int rc = 0;
- int resp_buftype;
+ int resp_buftype, max_len, min_len;
struct cifs_ses *ses = tcon->ses;
unsigned int rsp_len, offset;
- rc = build_qfs_info_req(&iov, tcon, SMB_QUERY_FS_ATTRIBUTE_INFO,
- sizeof(FILE_SYSTEM_ATTRIBUTE_INFO),
+ if (level == FS_DEVICE_INFORMATION) {
+ max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
+ min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
+ } else if (level == FS_ATTRIBUTE_INFORMATION) {
+ max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
+ min_len = MIN_FS_ATTR_INFO_SIZE;
+ } else {
+ cifs_dbg(FYI, "Invalid qfsinfo level %d", level);
+ return -EINVAL;
+ }
+
+ rc = build_qfs_info_req(&iov, tcon, level, max_len,
persistent_fid, volatile_fid);
if (rc)
return rc;
@@ -2382,12 +2392,17 @@
rsp_len = le32_to_cpu(rsp->OutputBufferLength);
offset = le16_to_cpu(rsp->OutputBufferOffset);
- rc = validate_buf(offset, rsp_len, &rsp->hdr, MIN_FS_ATTR_INFO_SIZE);
- if (!rc) {
+ rc = validate_buf(offset, rsp_len, &rsp->hdr, min_len);
+ if (rc)
+ goto qfsattr_exit;
+
+ if (level == FS_ATTRIBUTE_INFORMATION)
memcpy(&tcon->fsAttrInfo, 4 /* RFC1001 len */ + offset
+ (char *)&rsp->hdr, min_t(unsigned int,
- rsp_len, sizeof(FILE_SYSTEM_ATTRIBUTE_INFO)));
- }
+ rsp_len, max_len));
+ else if (level == FS_DEVICE_INFORMATION)
+ memcpy(&tcon->fsDevInfo, 4 /* RFC1001 len */ + offset
+ + (char *)&rsp->hdr, sizeof(FILE_SYSTEM_DEVICE_INFO));
qfsattr_exit:
free_rsp_buf(resp_buftype, iov.iov_base);