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 <linux/btrfs.h>
  36
  37 static long cifs_ioctl_copychunk(unsigned int xid, struct file *dst_file,
  38                         unsigned long srcfd)
  39 {
  40         int rc;
  41         struct fd src_file;
  42         struct inode *src_inode;
  43
  44         cifs_dbg(FYI, "ioctl copychunk range\n");
  45         /* the destination must be opened for writing */
  46         if (!(dst_file->f_mode & FMODE_WRITE)) {
  47                 cifs_dbg(FYI, "file target not open for write\n");
  48                 return -EINVAL;
  49         }
  50
  51         /* check if target volume is readonly and take reference */
  52         rc = mnt_want_write_file(dst_file);
  53         if (rc) {
  54                 cifs_dbg(FYI, "mnt_want_write failed with rc %d\n", rc);
  55                 return rc;
  56         }
  57
  58         src_file = fdget(srcfd);
  59         if (!src_file.file) {
  60                 rc = -EBADF;
  61                 goto out_drop_write;
  62         }
  63
  64         if (src_file.file->f_op->unlocked_ioctl != cifs_ioctl) {
  65                 rc = -EBADF;
  66                 cifs_dbg(VFS, "src file seems to be from a different filesystem type\n");
  67                 goto out_fput;
  68         }
  69
  70         src_inode = file_inode(src_file.file);
  71         rc = -EINVAL;
  72         if (S_ISDIR(src_inode->i_mode))
  73                 goto out_fput;
  74
  75         rc = cifs_file_copychunk_range(xid, src_file.file, 0, dst_file, 0,
  76                                         src_inode->i_size, 0);
  77         if (rc > 0)
  78                 rc = 0;
  79 out_fput:
  80         fdput(src_file);
  81 out_drop_write:
  82         mnt_drop_write_file(dst_file);
  83         return rc;
  84 }
  85
  86 static long smb_mnt_get_fsinfo(unsigned int xid, struct cifs_tcon *tcon,
  87                                 void __user *arg)
  88 {
  89         int rc = 0;
  90         struct smb_mnt_fs_info *fsinf;
  91
  92         fsinf = kzalloc(sizeof(struct smb_mnt_fs_info), GFP_KERNEL);
  93         if (fsinf == NULL)
  94                 return -ENOMEM;
  95
  96         fsinf->version = 1;
  97         fsinf->protocol_id = tcon->ses->server->vals->protocol_id;
  98         fsinf->device_characteristics =
  99                         le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics);
 100         fsinf->device_type = le32_to_cpu(tcon->fsDevInfo.DeviceType);
 101         fsinf->fs_attributes = le32_to_cpu(tcon->fsAttrInfo.Attributes);
 102         fsinf->max_path_component =
 103                 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
 104         fsinf->vol_serial_number = tcon->vol_serial_number;
 105         fsinf->vol_create_time = le64_to_cpu(tcon->vol_create_time);
 106         fsinf->share_flags = tcon->share_flags;
 107         fsinf->share_caps = le32_to_cpu(tcon->capabilities);
 108         fsinf->sector_flags = tcon->ss_flags;
 109         fsinf->optimal_sector_size = tcon->perf_sector_size;
 110         fsinf->max_bytes_chunk = tcon->max_bytes_chunk;
 111         fsinf->maximal_access = tcon->maximal_access;
 112         fsinf->cifs_posix_caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
 113
 114         if (copy_to_user(arg, fsinf, sizeof(struct smb_mnt_fs_info)))
 115                 rc = -EFAULT;
 116
 117         kfree(fsinf);
 118         return rc;
 119 }
 120
 121 long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
 122 {
 123         struct inode *inode = file_inode(filep);
 124         int rc = -ENOTTY; /* strange error - but the precedent */
 125         unsigned int xid;
 126         struct cifs_sb_info *cifs_sb;
 127         struct cifsFileInfo *pSMBFile = filep->private_data;
 128         struct cifs_tcon *tcon;
 129         __u64   ExtAttrBits = 0;
 130         __u64   caps;
 131
 132         xid = get_xid();
 133
 134         cifs_sb = CIFS_SB(inode->i_sb);
 135         cifs_dbg(FYI, "cifs ioctl 0x%x\n", command);
 136         switch (command) {
 137                 case FS_IOC_GETFLAGS:
 138                         if (pSMBFile == NULL)
 139                                 break;
 140                         tcon = tlink_tcon(pSMBFile->tlink);
 141                         caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
 142 #ifdef CONFIG_CIFS_POSIX
 143                         if (CIFS_UNIX_EXTATTR_CAP & caps) {
 144                                 __u64   ExtAttrMask = 0;
 145                                 rc = CIFSGetExtAttr(xid, tcon,
 146                                                     pSMBFile->fid.netfid,
 147                                                     &ExtAttrBits, &ExtAttrMask);
 148                                 if (rc == 0)
 149                                         rc = put_user(ExtAttrBits &
 150                                                 FS_FL_USER_VISIBLE,
 151                                                 (int __user *)arg);
 152                                 if (rc != EOPNOTSUPP)
 153                                         break;
 154                         }
 155 #endif /* CONFIG_CIFS_POSIX */
 156                         rc = 0;
 157                         if (CIFS_I(inode)->cifsAttrs & ATTR_COMPRESSED) {
 158                                 /* add in the compressed bit */
 159                                 ExtAttrBits = FS_COMPR_FL;
 160                                 rc = put_user(ExtAttrBits & FS_FL_USER_VISIBLE,
 161                                               (int __user *)arg);
 162                         }
 163                         break;
 164                 case FS_IOC_SETFLAGS:
 165                         if (pSMBFile == NULL)
 166                                 break;
 167                         tcon = tlink_tcon(pSMBFile->tlink);
 168                         caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
 169
 170                         if (get_user(ExtAttrBits, (int __user *)arg)) {
 171                                 rc = -EFAULT;
 172                                 break;
 173                         }
 174
 175                         /*
 176                          * if (CIFS_UNIX_EXTATTR_CAP & caps)
 177                          *      rc = CIFSSetExtAttr(xid, tcon,
 178                          *                     pSMBFile->fid.netfid,
 179                          *                     extAttrBits,
 180                          *                     &ExtAttrMask);
 181                          * if (rc != EOPNOTSUPP)
 182                          *      break;
 183                          */
 184
 185                         /* Currently only flag we can set is compressed flag */
 186                         if ((ExtAttrBits & FS_COMPR_FL) == 0)
 187                                 break;
 188
 189                         /* Try to set compress flag */
 190                         if (tcon->ses->server->ops->set_compression) {
 191                                 rc = tcon->ses->server->ops->set_compression(
 192                                                         xid, tcon, pSMBFile);
 193                                 cifs_dbg(FYI, "set compress flag rc %d\n", rc);
 194                         }
 195                         break;
 196                 case CIFS_IOC_COPYCHUNK_FILE:
 197                         rc = cifs_ioctl_copychunk(xid, filep, arg);
 198                         break;
 199                 case CIFS_IOC_SET_INTEGRITY:
 200                         if (pSMBFile == NULL)
 201                                 break;
 202                         tcon = tlink_tcon(pSMBFile->tlink);
 203                         if (tcon->ses->server->ops->set_integrity)
 204                                 rc = tcon->ses->server->ops->set_integrity(xid,
 205                                                 tcon, pSMBFile);
 206                         else
 207                                 rc = -EOPNOTSUPP;
 208                         break;
 209                 case CIFS_IOC_GET_MNT_INFO:
 210                         if (pSMBFile == NULL)
 211                                 break;
 212                         tcon = tlink_tcon(pSMBFile->tlink);
 213                         rc = smb_mnt_get_fsinfo(xid, tcon, (void __user *)arg);
 214                         break;
 215                 case CIFS_ENUMERATE_SNAPSHOTS:
 216                         if (pSMBFile == NULL)
 217                                 break;
 218                         if (arg == 0) {
 219                                 rc = -EINVAL;
 220                                 goto cifs_ioc_exit;
 221                         }
 222                         tcon = tlink_tcon(pSMBFile->tlink);
 223                         if (tcon->ses->server->ops->enum_snapshots)
 224                                 rc = tcon->ses->server->ops->enum_snapshots(xid, tcon,
 225                                                 pSMBFile, (void __user *)arg);
 226                         else
 227                                 rc = -EOPNOTSUPP;
 228                         break;
 229                 default:
 230                         cifs_dbg(FYI, "unsupported ioctl\n");
 231                         break;
 232         }
 233 cifs_ioc_exit:
 234         free_xid(xid);
 235         return rc;
 236 }