CIFS: Add statfs support for SMB2

Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org>
Signed-off-by: Steve French <smfrench@gmail.com>

diff --git a/fs/cifs/smb2glob.h b/fs/cifs/smb2glob.h
index 05d429b1c37eed340b5975c3eea3de99cedd99a6..7c0e2143e775e04f183ccad271de61e73bc2edf3 100644 (file)
--- a/fs/cifs/smb2glob.h
+++ b/fs/cifs/smb2glob.h
@@ -23,6 +23,8 @@
 #ifndef _SMB2_GLOB_H
 #define _SMB2_GLOB_H
 
+#define SMB2_MAGIC_NUMBER 0xFE534D42
+
 /*
  *****************************************************************
  * Constants go here

diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index 8c72e0768d1261becc1b491a1d339a5a0b73523d..3a8c682580269ac2adbf34e90ccdecb87c07415c 100644 (file)
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -18,12 +18,14 @@
  */
 
 #include <linux/pagemap.h>
+#include <linux/vfs.h>
 #include "cifsglob.h"
 #include "smb2pdu.h"
 #include "smb2proto.h"
 #include "cifsproto.h"
 #include "cifs_debug.h"
 #include "smb2status.h"
+#include "smb2glob.h"
 
 static int
 change_conf(struct TCP_Server_Info *server)
@@ -522,6 +524,25 @@ smb2_oplock_response(struct cifs_tcon *tcon, struct cifs_fid *fid,
                                 cinode->clientCanCacheRead ? 1 : 0);
 }
 
+static int
+smb2_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
+            struct kstatfs *buf)
+{
+       int rc;
+       u64 persistent_fid, volatile_fid;
+       __le16 srch_path = 0; /* Null - open root of share */
+       u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
+
+       rc = SMB2_open(xid, tcon, &srch_path, &persistent_fid, &volatile_fid,
+                      FILE_READ_ATTRIBUTES, FILE_OPEN, 0, 0, &oplock, NULL);
+       if (rc)
+               return rc;
+       buf->f_type = SMB2_MAGIC_NUMBER;
+       rc = SMB2_QFS_info(xid, tcon, persistent_fid, volatile_fid, buf);
+       SMB2_close(xid, tcon, persistent_fid, volatile_fid);
+       return rc;
+}
+
 struct smb_version_operations smb21_operations = {
        .setup_request = smb2_setup_request,
        .setup_async_request = smb2_setup_async_request,
@@ -578,6 +599,7 @@ struct smb_version_operations smb21_operations = {
        .calc_smb_size = smb2_calc_size,
        .is_status_pending = smb2_is_status_pending,
        .oplock_response = smb2_oplock_response,
+       .queryfs = smb2_queryfs,
 };
 
 struct smb_version_values smb21_values = {

diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 566d86b0ad96b8f250fd8e43179f3be705f69391..994c184ac9a946b545ecd70731fb24482b056c28 100644 (file)
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -1971,3 +1971,84 @@ SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
 
        return rc;
 }
+
+static void
+copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
+                       struct kstatfs *kst)
+{
+       kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
+                         le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
+       kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
+       kst->f_bfree  = le64_to_cpu(pfs_inf->ActualAvailableAllocationUnits);
+       kst->f_bavail = le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
+       return;
+}
+
+static int
+build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
+                  int outbuf_len, u64 persistent_fid, u64 volatile_fid)
+{
+       int rc;
+       struct smb2_query_info_req *req;
+
+       cFYI(1, "Query FSInfo level %d", level);
+
+       if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
+               return -EIO;
+
+       rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
+       if (rc)
+               return rc;
+
+       req->InfoType = SMB2_O_INFO_FILESYSTEM;
+       req->FileInfoClass = level;
+       req->PersistentFileId = persistent_fid;
+       req->VolatileFileId = volatile_fid;
+       /* 4 for rfc1002 length field and 1 for pad */
+       req->InputBufferOffset =
+                       cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
+       req->OutputBufferLength = cpu_to_le32(
+               outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);
+
+       iov->iov_base = (char *)req;
+       /* 4 for rfc1002 length field */
+       iov->iov_len = get_rfc1002_length(req) + 4;
+       return 0;
+}
+
+int
+SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
+             u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
+{
+       struct smb2_query_info_rsp *rsp = NULL;
+       struct kvec iov;
+       int rc = 0;
+       int resp_buftype;
+       struct cifs_ses *ses = tcon->ses;
+       struct smb2_fs_full_size_info *info = NULL;
+
+       rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
+                               sizeof(struct smb2_fs_full_size_info),
+                               persistent_fid, volatile_fid);
+       if (rc)
+               return rc;
+
+       rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
+       if (rc) {
+               cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
+               goto qinf_exit;
+       }
+       rsp = (struct smb2_query_info_rsp *)iov.iov_base;
+
+       info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
+               le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
+       rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
+                         le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
+                         sizeof(struct smb2_fs_full_size_info));
+       if (!rc)
+               copy_fs_info_to_kstatfs(info, fsdata);
+
+qinf_exit:
+       free_rsp_buf(resp_buftype, iov.iov_base);
+       return rc;
+}

diff --git a/fs/cifs/smb2pdu.h b/fs/cifs/smb2pdu.h
index 8a07457642972641b149fd4b49235d27df44e978..3c8e99ea88add0677332f0bce99b5ebcce750b85 100644 (file)
--- a/fs/cifs/smb2pdu.h
+++ b/fs/cifs/smb2pdu.h
@@ -630,6 +630,25 @@ struct smb2_oplock_break {
  *     BB consider moving to a different header
  */
 
+/* File System Information Classes */
+#define FS_VOLUME_INFORMATION          1 /* Query */
+#define FS_LABEL_INFORMATION           2 /* Set */
+#define FS_SIZE_INFORMATION            3 /* Query */
+#define FS_DEVICE_INFORMATION          4 /* Query */
+#define FS_ATTRIBUTE_INFORMATION       5 /* Query */
+#define FS_CONTROL_INFORMATION         6 /* Query, Set */
+#define FS_FULL_SIZE_INFORMATION       7 /* Query */
+#define FS_OBJECT_ID_INFORMATION       8 /* Query, Set */
+#define FS_DRIVER_PATH_INFORMATION     9 /* Query */
+
+struct smb2_fs_full_size_info {
+       __le64 TotalAllocationUnits;
+       __le64 CallerAvailableAllocationUnits;
+       __le64 ActualAvailableAllocationUnits;
+       __le32 SectorsPerAllocationUnit;
+       __le32 BytesPerSector;
+} __packed;
+
 /* partial list of QUERY INFO levels */
 #define FILE_DIRECTORY_INFORMATION     1
 #define FILE_FULL_DIRECTORY_INFORMATION 2

diff --git a/fs/cifs/smb2proto.h b/fs/cifs/smb2proto.h
index de554b716fdf842da97dad7a1f338dadb803396a..a73a963af8f4eca0d7f1d1bbff4944f1d4be7286 100644 (file)
--- a/fs/cifs/smb2proto.h
+++ b/fs/cifs/smb2proto.h
@@ -138,5 +138,8 @@ extern int SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
 extern int SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
                             const u64 persistent_fid, const u64 volatile_fid,
                             const __u8 oplock_level);
+extern int SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
+                        u64 persistent_file_id, u64 volatile_file_id,
+                        struct kstatfs *FSData);
 
 #endif                 /* _SMB2PROTO_H */