CIFS: Add SMB2 support for hardlink operation

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 8635574..21555d8 100644 (file)
--- a/fs/cifs/smb2glob.h
+++ b/fs/cifs/smb2glob.h
@@ -40,6 +40,7 @@
 #define SMB2_OP_MKDIR 5
 #define SMB2_OP_RENAME 6
 #define SMB2_OP_DELETE 7
+#define SMB2_OP_HARDLINK 8
 
 /* Used when constructing chained read requests. */
 #define CHAINED_REQUEST 1

diff --git a/fs/cifs/smb2inode.c b/fs/cifs/smb2inode.c
index a6952ba..1921c9c 100644 (file)
--- a/fs/cifs/smb2inode.c
+++ b/fs/cifs/smb2inode.c
@@ -78,6 +78,10 @@ smb2_open_op_close(const unsigned int xid, struct cifs_tcon *tcon,
                tmprc = SMB2_rename(xid, tcon, persistent_fid, volatile_fid,
                                    (__le16 *)data);
                break;
+       case SMB2_OP_HARDLINK:
+               tmprc = SMB2_set_hardlink(xid, tcon, persistent_fid,
+                                         volatile_fid, (__le16 *)data);
+               break;
        default:
                cERROR(1, "Invalid command");
                break;
@@ -175,10 +179,10 @@ smb2_unlink(const unsigned int xid, struct cifs_tcon *tcon, const char *name,
                                  SMB2_OP_DELETE);
 }
 
-int
-smb2_rename_path(const unsigned int xid, struct cifs_tcon *tcon,
-                const char *from_name, const char *to_name,
-                struct cifs_sb_info *cifs_sb)
+static int
+smb2_set_path_attr(const unsigned int xid, struct cifs_tcon *tcon,
+                  const char *from_name, const char *to_name,
+                  struct cifs_sb_info *cifs_sb, __u32 access, int command)
 {
        __le16 *smb2_to_name = NULL;
        int rc;
@@ -189,9 +193,27 @@ smb2_rename_path(const unsigned int xid, struct cifs_tcon *tcon,
                goto smb2_rename_path;
        }
 
-       rc = smb2_open_op_close(xid, tcon, cifs_sb, from_name, DELETE,
-                               FILE_OPEN, 0, 0, smb2_to_name, SMB2_OP_RENAME);
+       rc = smb2_open_op_close(xid, tcon, cifs_sb, from_name, access,
+                               FILE_OPEN, 0, 0, smb2_to_name, command);
 smb2_rename_path:
        kfree(smb2_to_name);
        return rc;
 }
+
+int
+smb2_rename_path(const unsigned int xid, struct cifs_tcon *tcon,
+                const char *from_name, const char *to_name,
+                struct cifs_sb_info *cifs_sb)
+{
+       return smb2_set_path_attr(xid, tcon, from_name, to_name, cifs_sb,
+                                 DELETE, SMB2_OP_RENAME);
+}
+
+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)
+{
+       return smb2_set_path_attr(xid, tcon, from_name, to_name, cifs_sb,
+                                 FILE_READ_ATTRIBUTES, SMB2_OP_HARDLINK);
+}

diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index 5aaccb0..75693e9 100644 (file)
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -452,6 +452,7 @@ struct smb_version_operations smb21_operations = {
        .rmdir = smb2_rmdir,
        .unlink = smb2_unlink,
        .rename = smb2_rename_path,
+       .create_hardlink = smb2_create_hardlink,
        .open = smb2_open_file,
        .set_fid = smb2_set_fid,
        .close = smb2_close_file,

diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 1dc11ce..a684c4a 100644 (file)
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -1709,3 +1709,34 @@ SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
        kfree(data);
        return rc;
 }
+
+int
+SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
+                 u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
+{
+       struct smb2_file_link_info info;
+       void **data;
+       unsigned int size[2];
+       int rc;
+       int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
+
+       data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
+       if (!data)
+               return -ENOMEM;
+
+       info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
+                             /* 0 = fail if link already exists */
+       info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
+       info.FileNameLength = cpu_to_le32(len);
+
+       data[0] = &info;
+       size[0] = sizeof(struct smb2_file_link_info);
+
+       data[1] = target_file;
+       size[1] = len + 2 /* null */;
+
+       rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
+                          FILE_LINK_INFORMATION, 2, data, size);
+       kfree(data);
+       return rc;
+}

diff --git a/fs/cifs/smb2pdu.h b/fs/cifs/smb2pdu.h
index b03ca37..0f3c482 100644 (file)
--- a/fs/cifs/smb2pdu.h
+++ b/fs/cifs/smb2pdu.h
@@ -653,6 +653,15 @@ struct smb2_file_rename_info { /* encoding of request for level 10 */
        char   FileName[0];     /* New name to be assigned */
 } __packed; /* level 10 Set */
 
+struct smb2_file_link_info { /* encoding of request for level 11 */
+       __u8   ReplaceIfExists; /* 1 = replace existing link with new */
+                               /* 0 = fail if link already exists */
+       __u8   Reserved[7];
+       __u64  RootDirectory;  /* MBZ for network operations (why says spec?) */
+       __le32 FileNameLength;
+       char   FileName[0];     /* Name to be assigned to new link */
+} __packed; /* level 11 Set */
+
 /*
  * This level 18, although with struct with same name is different from cifs
  * level 0x107. Level 0x107 has an extra u64 between AccessFlags and

diff --git a/fs/cifs/smb2proto.h b/fs/cifs/smb2proto.h
index b43036e..99f6945 100644 (file)
--- a/fs/cifs/smb2proto.h
+++ b/fs/cifs/smb2proto.h
@@ -68,6 +68,9 @@ extern int smb2_unlink(const unsigned int xid, struct cifs_tcon *tcon,
 extern int smb2_rename_path(const unsigned int xid, struct cifs_tcon *tcon,
                            const char *from_name, const char *to_name,
                            struct cifs_sb_info *cifs_sb);
+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 smb2_open_file(const unsigned int xid, struct cifs_tcon *tcon,
                          const char *full_path, int disposition,
@@ -112,5 +115,8 @@ extern int SMB2_echo(struct TCP_Server_Info *server);
 extern int SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
                       u64 persistent_fid, u64 volatile_fid,
                       __le16 *target_file);
+extern int SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
+                            u64 persistent_fid, u64 volatile_fid,
+                            __le16 *target_file);
 
 #endif                 /* _SMB2PROTO_H */