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Linux/fs/cifs/smb2inode.c

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  1 /*
  2  *   fs/cifs/smb2inode.c
  3  *
  4  *   Copyright (C) International Business Machines  Corp., 2002, 2011
  5  *                 Etersoft, 2012
  6  *   Author(s): Pavel Shilovsky (pshilovsky@samba.org),
  7  *              Steve French (sfrench@us.ibm.com)
  8  *
  9  *   This library is free software; you can redistribute it and/or modify
 10  *   it under the terms of the GNU Lesser General Public License as published
 11  *   by the Free Software Foundation; either version 2.1 of the License, or
 12  *   (at your option) any later version.
 13  *
 14  *   This library is distributed in the hope that it will be useful,
 15  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 16  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 17  *   the GNU Lesser General Public License for more details.
 18  *
 19  *   You should have received a copy of the GNU Lesser General Public License
 20  *   along with this library; if not, write to the Free Software
 21  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 22  */
 23 #include <linux/fs.h>
 24 #include <linux/stat.h>
 25 #include <linux/slab.h>
 26 #include <linux/pagemap.h>
 27 #include <asm/div64.h>
 28 #include "cifsfs.h"
 29 #include "cifspdu.h"
 30 #include "cifsglob.h"
 31 #include "cifsproto.h"
 32 #include "cifs_debug.h"
 33 #include "cifs_fs_sb.h"
 34 #include "cifs_unicode.h"
 35 #include "fscache.h"
 36 #include "smb2glob.h"
 37 #include "smb2pdu.h"
 38 #include "smb2proto.h"
 39 
 40 static int
 41 smb2_open_op_close(const unsigned int xid, struct cifs_tcon *tcon,
 42                    struct cifs_sb_info *cifs_sb, const char *full_path,
 43                    __u32 desired_access, __u32 create_disposition,
 44                    __u32 create_options, void *data, int command)
 45 {
 46         int rc, tmprc = 0;
 47         __le16 *utf16_path;
 48         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
 49         struct cifs_open_parms oparms;
 50         struct cifs_fid fid;
 51 
 52         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
 53         if (!utf16_path)
 54                 return -ENOMEM;
 55 
 56         oparms.tcon = tcon;
 57         oparms.desired_access = desired_access;
 58         oparms.disposition = create_disposition;
 59         oparms.create_options = create_options;
 60         oparms.fid = &fid;
 61         oparms.reconnect = false;
 62 
 63         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL);
 64         if (rc) {
 65                 kfree(utf16_path);
 66                 return rc;
 67         }
 68 
 69         switch (command) {
 70         case SMB2_OP_DELETE:
 71                 break;
 72         case SMB2_OP_QUERY_INFO:
 73                 tmprc = SMB2_query_info(xid, tcon, fid.persistent_fid,
 74                                         fid.volatile_fid,
 75                                         (struct smb2_file_all_info *)data);
 76                 break;
 77         case SMB2_OP_MKDIR:
 78                 /*
 79                  * Directories are created through parameters in the
 80                  * SMB2_open() call.
 81                  */
 82                 break;
 83         case SMB2_OP_RMDIR:
 84                 tmprc = SMB2_rmdir(xid, tcon, fid.persistent_fid,
 85                                    fid.volatile_fid);
 86                 break;
 87         case SMB2_OP_RENAME:
 88                 tmprc = SMB2_rename(xid, tcon, fid.persistent_fid,
 89                                     fid.volatile_fid, (__le16 *)data);
 90                 break;
 91         case SMB2_OP_HARDLINK:
 92                 tmprc = SMB2_set_hardlink(xid, tcon, fid.persistent_fid,
 93                                           fid.volatile_fid, (__le16 *)data);
 94                 break;
 95         case SMB2_OP_SET_EOF:
 96                 tmprc = SMB2_set_eof(xid, tcon, fid.persistent_fid,
 97                                      fid.volatile_fid, current->tgid,
 98                                      (__le64 *)data, false);
 99                 break;
100         case SMB2_OP_SET_INFO:
101                 tmprc = SMB2_set_info(xid, tcon, fid.persistent_fid,
102                                       fid.volatile_fid,
103                                       (FILE_BASIC_INFO *)data);
104                 break;
105         default:
106                 cifs_dbg(VFS, "Invalid command\n");
107                 break;
108         }
109 
110         rc = SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
111         if (tmprc)
112                 rc = tmprc;
113         kfree(utf16_path);
114         return rc;
115 }
116 
117 void
118 move_smb2_info_to_cifs(FILE_ALL_INFO *dst, struct smb2_file_all_info *src)
119 {
120         memcpy(dst, src, (size_t)(&src->CurrentByteOffset) - (size_t)src);
121         dst->CurrentByteOffset = src->CurrentByteOffset;
122         dst->Mode = src->Mode;
123         dst->AlignmentRequirement = src->AlignmentRequirement;
124         dst->IndexNumber1 = 0; /* we don't use it */
125 }
126 
127 int
128 smb2_query_path_info(const unsigned int xid, struct cifs_tcon *tcon,
129                      struct cifs_sb_info *cifs_sb, const char *full_path,
130                      FILE_ALL_INFO *data, bool *adjust_tz, bool *symlink)
131 {
132         int rc;
133         struct smb2_file_all_info *smb2_data;
134 
135         *adjust_tz = false;
136         *symlink = false;
137 
138         smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
139                             GFP_KERNEL);
140         if (smb2_data == NULL)
141                 return -ENOMEM;
142 
143         rc = smb2_open_op_close(xid, tcon, cifs_sb, full_path,
144                                 FILE_READ_ATTRIBUTES, FILE_OPEN, 0,
145                                 smb2_data, SMB2_OP_QUERY_INFO);
146         if (rc == -EOPNOTSUPP) {
147                 *symlink = true;
148                 /* Failed on a symbolic link - query a reparse point info */
149                 rc = smb2_open_op_close(xid, tcon, cifs_sb, full_path,
150                                         FILE_READ_ATTRIBUTES, FILE_OPEN,
151                                         OPEN_REPARSE_POINT, smb2_data,
152                                         SMB2_OP_QUERY_INFO);
153         }
154         if (rc)
155                 goto out;
156 
157         move_smb2_info_to_cifs(data, smb2_data);
158 out:
159         kfree(smb2_data);
160         return rc;
161 }
162 
163 int
164 smb2_mkdir(const unsigned int xid, struct cifs_tcon *tcon, const char *name,
165            struct cifs_sb_info *cifs_sb)
166 {
167         return smb2_open_op_close(xid, tcon, cifs_sb, name,
168                                   FILE_WRITE_ATTRIBUTES, FILE_CREATE,
169                                   CREATE_NOT_FILE, NULL, SMB2_OP_MKDIR);
170 }
171 
172 void
173 smb2_mkdir_setinfo(struct inode *inode, const char *name,
174                    struct cifs_sb_info *cifs_sb, struct cifs_tcon *tcon,
175                    const unsigned int xid)
176 {
177         FILE_BASIC_INFO data;
178         struct cifsInodeInfo *cifs_i;
179         u32 dosattrs;
180         int tmprc;
181 
182         memset(&data, 0, sizeof(data));
183         cifs_i = CIFS_I(inode);
184         dosattrs = cifs_i->cifsAttrs | ATTR_READONLY;
185         data.Attributes = cpu_to_le32(dosattrs);
186         tmprc = smb2_open_op_close(xid, tcon, cifs_sb, name,
187                                    FILE_WRITE_ATTRIBUTES, FILE_CREATE,
188                                    CREATE_NOT_FILE, &data, SMB2_OP_SET_INFO);
189         if (tmprc == 0)
190                 cifs_i->cifsAttrs = dosattrs;
191 }
192 
193 int
194 smb2_rmdir(const unsigned int xid, struct cifs_tcon *tcon, const char *name,
195            struct cifs_sb_info *cifs_sb)
196 {
197         return smb2_open_op_close(xid, tcon, cifs_sb, name, DELETE, FILE_OPEN,
198                                   CREATE_NOT_FILE,
199                                   NULL, SMB2_OP_RMDIR);
200 }
201 
202 int
203 smb2_unlink(const unsigned int xid, struct cifs_tcon *tcon, const char *name,
204             struct cifs_sb_info *cifs_sb)
205 {
206         return smb2_open_op_close(xid, tcon, cifs_sb, name, DELETE, FILE_OPEN,
207                                   CREATE_DELETE_ON_CLOSE | OPEN_REPARSE_POINT,
208                                   NULL, SMB2_OP_DELETE);
209 }
210 
211 static int
212 smb2_set_path_attr(const unsigned int xid, struct cifs_tcon *tcon,
213                    const char *from_name, const char *to_name,
214                    struct cifs_sb_info *cifs_sb, __u32 access, int command)
215 {
216         __le16 *smb2_to_name = NULL;
217         int rc;
218 
219         smb2_to_name = cifs_convert_path_to_utf16(to_name, cifs_sb);
220         if (smb2_to_name == NULL) {
221                 rc = -ENOMEM;
222                 goto smb2_rename_path;
223         }
224 
225         rc = smb2_open_op_close(xid, tcon, cifs_sb, from_name, access,
226                                 FILE_OPEN, 0, smb2_to_name, command);
227 smb2_rename_path:
228         kfree(smb2_to_name);
229         return rc;
230 }
231 
232 int
233 smb2_rename_path(const unsigned int xid, struct cifs_tcon *tcon,
234                  const char *from_name, const char *to_name,
235                  struct cifs_sb_info *cifs_sb)
236 {
237         return smb2_set_path_attr(xid, tcon, from_name, to_name, cifs_sb,
238                                   DELETE, SMB2_OP_RENAME);
239 }
240 
241 int
242 smb2_create_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
243                      const char *from_name, const char *to_name,
244                      struct cifs_sb_info *cifs_sb)
245 {
246         return smb2_set_path_attr(xid, tcon, from_name, to_name, cifs_sb,
247                                   FILE_READ_ATTRIBUTES, SMB2_OP_HARDLINK);
248 }
249 
250 int
251 smb2_set_path_size(const unsigned int xid, struct cifs_tcon *tcon,
252                    const char *full_path, __u64 size,
253                    struct cifs_sb_info *cifs_sb, bool set_alloc)
254 {
255         __le64 eof = cpu_to_le64(size);
256         return smb2_open_op_close(xid, tcon, cifs_sb, full_path,
257                                   FILE_WRITE_DATA, FILE_OPEN, 0, &eof,
258                                   SMB2_OP_SET_EOF);
259 }
260 
261 int
262 smb2_set_file_info(struct inode *inode, const char *full_path,
263                    FILE_BASIC_INFO *buf, const unsigned int xid)
264 {
265         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
266         struct tcon_link *tlink;
267         int rc;
268 
269         if ((buf->CreationTime == 0) && (buf->LastAccessTime == 0) &&
270             (buf->LastWriteTime == 0) && (buf->ChangeTime) &&
271             (buf->Attributes == 0))
272                 return 0; /* would be a no op, no sense sending this */
273 
274         tlink = cifs_sb_tlink(cifs_sb);
275         if (IS_ERR(tlink))
276                 return PTR_ERR(tlink);
277 
278         rc = smb2_open_op_close(xid, tlink_tcon(tlink), cifs_sb, full_path,
279                                 FILE_WRITE_ATTRIBUTES, FILE_OPEN, 0, buf,
280                                 SMB2_OP_SET_INFO);
281         cifs_put_tlink(tlink);
282         return rc;
283 }
284 

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