fs/cifs/ioctl.c

   1 /*
   2  *   fs/cifs/ioctl.c
   3  *
   4  *   vfs operations that deal with io control
   5  *
   6  *   Copyright (C) International Business Machines  Corp., 2005,2013
   7  *   Author(s): 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
  24 #include <linux/fs.h>
  25 #include <linux/file.h>
  26 #include <linux/mount.h>
  27 #include <linux/mm.h>
  28 #include <linux/pagemap.h>
  29 #include "cifspdu.h"
  30 #include "cifsglob.h"
  31 #include "cifsproto.h"
  32 #include "cifs_debug.h"
  33 #include "cifsfs.h"
  34 #include "cifs_ioctl.h"
  35 #include "smb2proto.h"
  36 #include <linux/btrfs.h>
  37
  38 static long cifs_ioctl_query_info(unsigned int xid, struct file *filep,
  39                                   unsigned long p)
  40 {
  41         struct inode *inode = file_inode(filep);
  42         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
  43         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
  44         struct dentry *dentry = filep->f_path.dentry;
  45         unsigned char *path;
  46         __le16 *utf16_path = NULL, root_path;
  47         int rc = 0;
  48
  49         path = build_path_from_dentry(dentry);
  50         if (path == NULL)
  51                 return -ENOMEM;
  52
  53         cifs_dbg(FYI, "%s %s\n", __func__, path);
  54
  55         if (!path[0]) {
  56                 root_path = 0;
  57                 utf16_path = &root_path;
  58         } else {
  59                 utf16_path = cifs_convert_path_to_utf16(path + 1, cifs_sb);
  60                 if (!utf16_path) {
  61                         rc = -ENOMEM;
  62                         goto ici_exit;
  63                 }
  64         }
  65
  66         if (tcon->ses->server->ops->ioctl_query_info)
  67                 rc = tcon->ses->server->ops->ioctl_query_info(
  68                                 xid, tcon, utf16_path,
  69                                 filep->private_data ? 0 : 1, p);
  70         else
  71                 rc = -EOPNOTSUPP;
  72
  73  ici_exit:
  74         if (utf16_path != &root_path)
  75                 kfree(utf16_path);
  76         kfree(path);
  77         return rc;
  78 }
  79
  80 static long cifs_ioctl_copychunk(unsigned int xid, struct file *dst_file,
  81                         unsigned long srcfd)
  82 {
  83         int rc;
  84         struct fd src_file;
  85         struct inode *src_inode;
  86
  87         cifs_dbg(FYI, "ioctl copychunk range\n");
  88         /* the destination must be opened for writing */
  89         if (!(dst_file->f_mode & FMODE_WRITE)) {
  90                 cifs_dbg(FYI, "file target not open for write\n");
  91                 return -EINVAL;
  92         }
  93
  94         /* check if target volume is readonly and take reference */
  95         rc = mnt_want_write_file(dst_file);
  96         if (rc) {
  97                 cifs_dbg(FYI, "mnt_want_write failed with rc %d\n", rc);
  98                 return rc;
  99         }
 100
 101         src_file = fdget(srcfd);
 102         if (!src_file.file) {
 103                 rc = -EBADF;
 104                 goto out_drop_write;
 105         }
 106
 107         if (src_file.file->f_op->unlocked_ioctl != cifs_ioctl) {
 108                 rc = -EBADF;
 109                 cifs_dbg(VFS, "src file seems to be from a different filesystem type\n");
 110                 goto out_fput;
 111         }
 112
 113         src_inode = file_inode(src_file.file);
 114         rc = -EINVAL;
 115         if (S_ISDIR(src_inode->i_mode))
 116                 goto out_fput;
 117
 118         rc = cifs_file_copychunk_range(xid, src_file.file, 0, dst_file, 0,
 119                                         src_inode->i_size, 0);
 120         if (rc > 0)
 121                 rc = 0;
 122 out_fput:
 123         fdput(src_file);
 124 out_drop_write:
 125         mnt_drop_write_file(dst_file);
 126         return rc;
 127 }
 128
 129 static long smb_mnt_get_fsinfo(unsigned int xid, struct cifs_tcon *tcon,
 130                                 void __user *arg)
 131 {
 132         int rc = 0;
 133         struct smb_mnt_fs_info *fsinf;
 134
 135         fsinf = kzalloc(sizeof(struct smb_mnt_fs_info), GFP_KERNEL);
 136         if (fsinf == NULL)
 137                 return -ENOMEM;
 138
 139         fsinf->version = 1;
 140         fsinf->protocol_id = tcon->ses->server->vals->protocol_id;
 141         fsinf->device_characteristics =
 142                         le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics);
 143         fsinf->device_type = le32_to_cpu(tcon->fsDevInfo.DeviceType);
 144         fsinf->fs_attributes = le32_to_cpu(tcon->fsAttrInfo.Attributes);
 145         fsinf->max_path_component =
 146                 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
 147         fsinf->vol_serial_number = tcon->vol_serial_number;
 148         fsinf->vol_create_time = le64_to_cpu(tcon->vol_create_time);
 149         fsinf->share_flags = tcon->share_flags;
 150         fsinf->share_caps = le32_to_cpu(tcon->capabilities);
 151         fsinf->sector_flags = tcon->ss_flags;
 152         fsinf->optimal_sector_size = tcon->perf_sector_size;
 153         fsinf->max_bytes_chunk = tcon->max_bytes_chunk;
 154         fsinf->maximal_access = tcon->maximal_access;
 155         fsinf->cifs_posix_caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
 156
 157         if (copy_to_user(arg, fsinf, sizeof(struct smb_mnt_fs_info)))
 158                 rc = -EFAULT;
 159
 160         kfree(fsinf);
 161         return rc;
 162 }
 163
 164 long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
 165 {
 166         struct inode *inode = file_inode(filep);
 167         int rc = -ENOTTY; /* strange error - but the precedent */
 168         unsigned int xid;
 169         struct cifsFileInfo *pSMBFile = filep->private_data;
 170         struct cifs_tcon *tcon;
 171         __u64   ExtAttrBits = 0;
 172         __u64   caps;
 173
 174         xid = get_xid();
 175
 176         cifs_dbg(FYI, "cifs ioctl 0x%x\n", command);
 177         switch (command) {
 178                 case FS_IOC_GETFLAGS:
 179                         if (pSMBFile == NULL)
 180                                 break;
 181                         tcon = tlink_tcon(pSMBFile->tlink);
 182                         caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
 183 #ifdef CONFIG_CIFS_POSIX
 184                         if (CIFS_UNIX_EXTATTR_CAP & caps) {
 185                                 __u64   ExtAttrMask = 0;
 186                                 rc = CIFSGetExtAttr(xid, tcon,
 187                                                     pSMBFile->fid.netfid,
 188                                                     &ExtAttrBits, &ExtAttrMask);
 189                                 if (rc == 0)
 190                                         rc = put_user(ExtAttrBits &
 191                                                 FS_FL_USER_VISIBLE,
 192                                                 (int __user *)arg);
 193                                 if (rc != EOPNOTSUPP)
 194                                         break;
 195                         }
 196 #endif /* CONFIG_CIFS_POSIX */
 197                         rc = 0;
 198                         if (CIFS_I(inode)->cifsAttrs & ATTR_COMPRESSED) {
 199                                 /* add in the compressed bit */
 200                                 ExtAttrBits = FS_COMPR_FL;
 201                                 rc = put_user(ExtAttrBits & FS_FL_USER_VISIBLE,
 202                                               (int __user *)arg);
 203                         }
 204                         break;
 205                 case FS_IOC_SETFLAGS:
 206                         if (pSMBFile == NULL)
 207                                 break;
 208                         tcon = tlink_tcon(pSMBFile->tlink);
 209                         caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
 210
 211                         if (get_user(ExtAttrBits, (int __user *)arg)) {
 212                                 rc = -EFAULT;
 213                                 break;
 214                         }
 215
 216                         /*
 217                          * if (CIFS_UNIX_EXTATTR_CAP & caps)
 218                          *      rc = CIFSSetExtAttr(xid, tcon,
 219                          *                     pSMBFile->fid.netfid,
 220                          *                     extAttrBits,
 221                          *                     &ExtAttrMask);
 222                          * if (rc != EOPNOTSUPP)
 223                          *      break;
 224                          */
 225
 226                         /* Currently only flag we can set is compressed flag */
 227                         if ((ExtAttrBits & FS_COMPR_FL) == 0)
 228                                 break;
 229
 230                         /* Try to set compress flag */
 231                         if (tcon->ses->server->ops->set_compression) {
 232                                 rc = tcon->ses->server->ops->set_compression(
 233                                                         xid, tcon, pSMBFile);
 234                                 cifs_dbg(FYI, "set compress flag rc %d\n", rc);
 235                         }
 236                         break;
 237                 case CIFS_IOC_COPYCHUNK_FILE:
 238                         rc = cifs_ioctl_copychunk(xid, filep, arg);
 239                         break;
 240                 case CIFS_QUERY_INFO:
 241                         rc = cifs_ioctl_query_info(xid, filep, arg);
 242                         break;
 243                 case CIFS_IOC_SET_INTEGRITY:
 244                         if (pSMBFile == NULL)
 245                                 break;
 246                         tcon = tlink_tcon(pSMBFile->tlink);
 247                         if (tcon->ses->server->ops->set_integrity)
 248                                 rc = tcon->ses->server->ops->set_integrity(xid,
 249                                                 tcon, pSMBFile);
 250                         else
 251                                 rc = -EOPNOTSUPP;
 252                         break;
 253                 case CIFS_IOC_GET_MNT_INFO:
 254                         if (pSMBFile == NULL)
 255                                 break;
 256                         tcon = tlink_tcon(pSMBFile->tlink);
 257                         rc = smb_mnt_get_fsinfo(xid, tcon, (void __user *)arg);
 258                         break;
 259                 case CIFS_ENUMERATE_SNAPSHOTS:
 260                         if (pSMBFile == NULL)
 261                                 break;
 262                         if (arg == 0) {
 263                                 rc = -EINVAL;
 264                                 goto cifs_ioc_exit;
 265                         }
 266                         tcon = tlink_tcon(pSMBFile->tlink);
 267                         if (tcon->ses->server->ops->enum_snapshots)
 268                                 rc = tcon->ses->server->ops->enum_snapshots(xid, tcon,
 269                                                 pSMBFile, (void __user *)arg);
 270                         else
 271                                 rc = -EOPNOTSUPP;
 272                         break;
 273                 default:
 274                         cifs_dbg(FYI, "unsupported ioctl\n");
 275                         break;
 276         }
 277 cifs_ioc_exit:
 278         free_xid(xid);
 279         return rc;
 280 }