3 files changed, 68 insertions, 1 deletions

diff --git a/fs/cifs/link.c b/fs/cifs/link.c
index 5657416d3483..1216f4f1c6c9 100644
--- a/fs/cifs/link.c
+++ b/fs/cifs/link.c
@@ -28,6 +28,7 @@
 #include "cifsproto.h"
 #include "cifs_debug.h"
 #include "cifs_fs_sb.h"
+#include "smb2proto.h"
 
 /*
  * M-F Symlink Functions - Begin
@@ -400,6 +401,68 @@ cifs_create_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
         return rc;
 }
 
+int
+smb3_create_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
+                       struct cifs_sb_info *cifs_sb, const unsigned char *path,
+                       char *pbuf, unsigned int *pbytes_written)
+{
+        int rc;
+        struct cifs_fid fid;
+        struct cifs_open_parms oparms;
+        struct cifs_io_parms io_parms;
+        int create_options = CREATE_NOT_DIR;
+        __le16 *utf16_path;
+        __u8 oplock = SMB2_OPLOCK_LEVEL_EXCLUSIVE;
+        struct kvec iov[2];
+
+        if (backup_cred(cifs_sb))
+                create_options |= CREATE_OPEN_BACKUP_INTENT;
+
+        cifs_dbg(FYI, "%s: path: %s\n", __func__, path);
+
+        utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
+        if (!utf16_path)
+                return -ENOMEM;
+
+        oparms.tcon = tcon;
+        oparms.cifs_sb = cifs_sb;
+        oparms.desired_access = GENERIC_WRITE;
+        oparms.create_options = create_options;
+        oparms.disposition = FILE_CREATE;
+        oparms.fid = &fid;
+        oparms.reconnect = false;
+
+        rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL);
+        if (rc) {
+                kfree(utf16_path);
+                return rc;
+        }
+
+        io_parms.netfid = fid.netfid;
+        io_parms.pid = current->tgid;
+        io_parms.tcon = tcon;
+        io_parms.offset = 0;
+        io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE;
+        io_parms.persistent_fid = fid.persistent_fid;
+        io_parms.volatile_fid = fid.volatile_fid;
+
+        /* iov[0] is reserved for smb header */
+        iov[1].iov_base = pbuf;
+        iov[1].iov_len = CIFS_MF_SYMLINK_FILE_SIZE;
+
+        rc = SMB2_write(xid, &io_parms, pbytes_written, iov, 1);
+
+        /* Make sure we wrote all of the symlink data */
+        if ((rc == 0) && (*pbytes_written != CIFS_MF_SYMLINK_FILE_SIZE))
+                rc = -EIO;
+
+        SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
+
+        kfree(utf16_path);
+        return rc;
+}
+
+
 /*
  * M-F Symlink Functions - End
  */
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index ea158c9dea15..5e35d51504fd 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -1452,6 +1452,7 @@ struct smb_version_operations smb21_operations = {
         .rename = smb2_rename_path,
         .create_hardlink = smb2_create_hardlink,
         .query_symlink = smb2_query_symlink,
+        .create_mf_symlink = smb3_create_mf_symlink,
         .open = smb2_open_file,
         .set_fid = smb2_set_fid,
         .close = smb2_close_file,
@@ -1531,6 +1532,7 @@ struct smb_version_operations smb30_operations = {
         .rename = smb2_rename_path,
         .create_hardlink = smb2_create_hardlink,
         .query_symlink = smb2_query_symlink,
+        .create_mf_symlink = smb3_create_mf_symlink,
         .open = smb2_open_file,
         .set_fid = smb2_set_fid,
         .close = smb2_close_file,
diff --git a/fs/cifs/smb2proto.h b/fs/cifs/smb2proto.h
index 67e8ce8055de..e144ecfaa797 100644
--- a/fs/cifs/smb2proto.h
+++ b/fs/cifs/smb2proto.h
@@ -82,7 +82,9 @@ extern int smb2_rename_path(const unsigned int xid, struct cifs_tcon *tcon,
 extern int smb2_create_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
                                 const char *from_name, const char *to_name,
                                 struct cifs_sb_info *cifs_sb);
-
+extern int smb3_create_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
+                        struct cifs_sb_info *cifs_sb, const unsigned char *path,
+                        char *pbuf, unsigned int *pbytes_written);
 extern int smb2_open_file(const unsigned int xid,
                           struct cifs_open_parms *oparms,
                           __u32 *oplock, FILE_ALL_INFO *buf);