smb3: add support for statfs for smb3.1.1 posix extensions

Output now matches expected stat -f output for all fields
except for Namelen and ID which were addressed in a companion
patch (which retrieves them from existing SMB3 mechanisms
and works whether POSIX enabled or not)

Signed-off-by: Steve French <smfrench@gmail.com>
Reviewed-by: Aurelien Aptel <aaptel@suse.com>

diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index 09506d9..e2a8b9d 100644 (file)
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -1533,6 +1533,39 @@ smb2_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
        return rc;
 }
 
+#ifdef CONFIG_CIFS_SMB311
+static int
+smb311_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
+            struct kstatfs *buf)
+{
+       int rc;
+       __le16 srch_path = 0; /* Null - open root of share */
+       u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
+       struct cifs_open_parms oparms;
+       struct cifs_fid fid;
+
+       if (!tcon->posix_extensions)
+               return smb2_queryfs(xid, tcon, buf);
+
+       oparms.tcon = tcon;
+       oparms.desired_access = FILE_READ_ATTRIBUTES;
+       oparms.disposition = FILE_OPEN;
+       oparms.create_options = 0;
+       oparms.fid = &fid;
+       oparms.reconnect = false;
+
+       rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL, NULL);
+       if (rc)
+               return rc;
+
+       rc = SMB311_posix_qfs_info(xid, tcon, fid.persistent_fid,
+                                  fid.volatile_fid, buf);
+       buf->f_type = SMB2_MAGIC_NUMBER;
+       SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
+       return rc;
+}
+#endif /* SMB311 */
+
 static bool
 smb2_compare_fids(struct cifsFileInfo *ob1, struct cifsFileInfo *ob2)
 {
@@ -3338,7 +3371,7 @@ struct smb_version_operations smb311_operations = {
        .is_status_pending = smb2_is_status_pending,
        .is_session_expired = smb2_is_session_expired,
        .oplock_response = smb2_oplock_response,
-       .queryfs = smb2_queryfs,
+       .queryfs = smb311_queryfs,
        .mand_lock = smb2_mand_lock,
        .mand_unlock_range = smb2_unlock_range,
        .push_mand_locks = smb2_push_mandatory_locks,

diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 6852ff5..fa9fc3f 100644 (file)
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -3938,6 +3938,27 @@ copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
        return;
 }
 
+#ifdef CONFIG_CIFS_SMB311
+static void
+copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,
+                       struct kstatfs *kst)
+{
+       kst->f_bsize = le32_to_cpu(response_data->BlockSize);
+       kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);
+       kst->f_bfree =  le64_to_cpu(response_data->BlocksAvail);
+       if (response_data->UserBlocksAvail == cpu_to_le64(-1))
+               kst->f_bavail = kst->f_bfree;
+       else
+               kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);
+       if (response_data->TotalFileNodes != cpu_to_le64(-1))
+               kst->f_files = le64_to_cpu(response_data->TotalFileNodes);
+       if (response_data->FreeFileNodes != cpu_to_le64(-1))
+               kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);
+
+       return;
+}
+#endif /* SMB311 */
+
 static int
 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
                   int outbuf_len, u64 persistent_fid, u64 volatile_fid)
@@ -3974,6 +3995,56 @@ build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
        return 0;
 }
 
+#ifdef CONFIG_CIFS_SMB311
+int
+SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
+             u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
+{
+       struct smb_rqst rqst;
+       struct smb2_query_info_rsp *rsp = NULL;
+       struct kvec iov;
+       struct kvec rsp_iov;
+       int rc = 0;
+       int resp_buftype;
+       struct cifs_ses *ses = tcon->ses;
+       FILE_SYSTEM_POSIX_INFO *info = NULL;
+       int flags = 0;
+
+       rc = build_qfs_info_req(&iov, tcon, FS_POSIX_INFORMATION,
+                               sizeof(FILE_SYSTEM_POSIX_INFO),
+                               persistent_fid, volatile_fid);
+       if (rc)
+               return rc;
+
+       if (smb3_encryption_required(tcon))
+               flags |= CIFS_TRANSFORM_REQ;
+
+       memset(&rqst, 0, sizeof(struct smb_rqst));
+       rqst.rq_iov = &iov;
+       rqst.rq_nvec = 1;
+
+       rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
+       cifs_small_buf_release(iov.iov_base);
+       if (rc) {
+               cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
+               goto posix_qfsinf_exit;
+       }
+       rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
+
+       info = (FILE_SYSTEM_POSIX_INFO *)(
+               le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
+       rc = validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
+                         le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
+                         sizeof(FILE_SYSTEM_POSIX_INFO));
+       if (!rc)
+               copy_posix_fs_info_to_kstatfs(info, fsdata);
+
+posix_qfsinf_exit:
+       free_rsp_buf(resp_buftype, rsp_iov.iov_base);
+       return rc;
+}
+#endif /* SMB311 */
+
 int
 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
              u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)

diff --git a/fs/cifs/smb2pdu.h b/fs/cifs/smb2pdu.h
index c2a4526..ecb0fee 100644 (file)
--- a/fs/cifs/smb2pdu.h
+++ b/fs/cifs/smb2pdu.h
@@ -1223,6 +1223,7 @@ struct smb2_lease_ack {
 #define FS_DRIVER_PATH_INFORMATION     9 /* Local only */
 #define FS_VOLUME_FLAGS_INFORMATION    10 /* Local only */
 #define FS_SECTOR_SIZE_INFORMATION     11 /* SMB3 or later. Query */
+#define FS_POSIX_INFORMATION           100 /* SMB3.1.1 POSIX. Query */
 
 struct smb2_fs_full_size_info {
        __le64 TotalAllocationUnits;

diff --git a/fs/cifs/smb2proto.h b/fs/cifs/smb2proto.h
index 6e6a4f2..7019459 100644 (file)
--- a/fs/cifs/smb2proto.h
+++ b/fs/cifs/smb2proto.h
@@ -197,6 +197,9 @@ void smb2_cancelled_close_fid(struct work_struct *work);
 extern int SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
                         u64 persistent_file_id, u64 volatile_file_id,
                         struct kstatfs *FSData);
+extern int SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
+                        u64 persistent_file_id, u64 volatile_file_id,
+                        struct kstatfs *FSData);
 extern int SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
                         u64 persistent_file_id, u64 volatile_file_id, int lvl);
 extern int SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,