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_clone(unsigned int xid, struct file *dst_file,
  38                         unsigned long srcfd, u64 off, u64 len, u64 destoff,
  39                         bool dup_extents)
  40 {
  41         int rc;
  42         struct cifsFileInfo *smb_file_target = dst_file->private_data;
  43         struct inode *target_inode = file_inode(dst_file);
  44         struct cifs_tcon *target_tcon;
  45         struct fd src_file;
  46         struct cifsFileInfo *smb_file_src;
  47         struct inode *src_inode;
  48         struct cifs_tcon *src_tcon;
  49
  50         cifs_dbg(FYI, "ioctl clone range\n");
  51         /* the destination must be opened for writing */
  52         if (!(dst_file->f_mode & FMODE_WRITE)) {
  53                 cifs_dbg(FYI, "file target not open for write\n");
  54                 return -EINVAL;
  55         }
  56
  57         /* check if target volume is readonly and take reference */
  58         rc = mnt_want_write_file(dst_file);
  59         if (rc) {
  60                 cifs_dbg(FYI, "mnt_want_write failed with rc %d\n", rc);
  61                 return rc;
  62         }
  63
  64         src_file = fdget(srcfd);
  65         if (!src_file.file) {
  66                 rc = -EBADF;
  67                 goto out_drop_write;
  68         }
  69
  70         if (src_file.file->f_op->unlocked_ioctl != cifs_ioctl) {
  71                 rc = -EBADF;
  72                 cifs_dbg(VFS, "src file seems to be from a different filesystem type\n");
  73                 goto out_fput;
  74         }
  75
  76         if ((!src_file.file->private_data) || (!dst_file->private_data)) {
  77                 rc = -EBADF;
  78                 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
  79                 goto out_fput;
  80         }
  81
  82         rc = -EXDEV;
  83         smb_file_target = dst_file->private_data;
  84         smb_file_src = src_file.file->private_data;
  85         src_tcon = tlink_tcon(smb_file_src->tlink);
  86         target_tcon = tlink_tcon(smb_file_target->tlink);
  87
  88         /* check source and target on same server (or volume if dup_extents) */
  89         if (dup_extents && (src_tcon != target_tcon)) {
  90                 cifs_dbg(VFS, "source and target of copy not on same share\n");
  91                 goto out_fput;
  92         }
  93
  94         if (!dup_extents && (src_tcon->ses != target_tcon->ses)) {
  95                 cifs_dbg(VFS, "source and target of copy not on same server\n");
  96                 goto out_fput;
  97         }
  98
  99         src_inode = file_inode(src_file.file);
 100         rc = -EINVAL;
 101         if (S_ISDIR(src_inode->i_mode))
 102                 goto out_fput;
 103
 104         /*
 105          * Note: cifs case is easier than btrfs since server responsible for
 106          * checks for proper open modes and file type and if it wants
 107          * server could even support copy of range where source = target
 108          */
 109         lock_two_nondirectories(target_inode, src_inode);
 110
 111         /* determine range to clone */
 112         rc = -EINVAL;
 113         if (off + len > src_inode->i_size || off + len < off)
 114                 goto out_unlock;
 115         if (len == 0)
 116                 len = src_inode->i_size - off;
 117
 118         cifs_dbg(FYI, "about to flush pages\n");
 119         /* should we flush first and last page first */
 120         truncate_inode_pages_range(&target_inode->i_data, destoff,
 121                                    PAGE_CACHE_ALIGN(destoff + len)-1);
 122
 123         if (dup_extents && target_tcon->ses->server->ops->duplicate_extents)
 124                 rc = target_tcon->ses->server->ops->duplicate_extents(xid,
 125                         smb_file_src, smb_file_target, off, len, destoff);
 126         else if (!dup_extents && target_tcon->ses->server->ops->clone_range)
 127                 rc = target_tcon->ses->server->ops->clone_range(xid,
 128                         smb_file_src, smb_file_target, off, len, destoff);
 129         else
 130                 rc = -EOPNOTSUPP;
 131
 132         /* force revalidate of size and timestamps of target file now
 133            that target is updated on the server */
 134         CIFS_I(target_inode)->time = 0;
 135 out_unlock:
 136         /* although unlocking in the reverse order from locking is not
 137            strictly necessary here it is a little cleaner to be consistent */
 138         unlock_two_nondirectories(src_inode, target_inode);
 139 out_fput:
 140         fdput(src_file);
 141 out_drop_write:
 142         mnt_drop_write_file(dst_file);
 143         return rc;
 144 }
 145
 146 static long smb_mnt_get_fsinfo(unsigned int xid, struct cifs_tcon *tcon,
 147                                 void __user *arg)
 148 {
 149         int rc = 0;
 150         struct smb_mnt_fs_info *fsinf;
 151
 152         fsinf = kzalloc(sizeof(struct smb_mnt_fs_info), GFP_KERNEL);
 153         if (fsinf == NULL)
 154                 return -ENOMEM;
 155
 156         fsinf->version = 1;
 157         fsinf->protocol_id = tcon->ses->server->vals->protocol_id;
 158         fsinf->device_characteristics =
 159                         le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics);
 160         fsinf->device_type = le32_to_cpu(tcon->fsDevInfo.DeviceType);
 161         fsinf->fs_attributes = le32_to_cpu(tcon->fsAttrInfo.Attributes);
 162         fsinf->max_path_component =
 163                 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
 164 #ifdef CONFIG_CIFS_SMB2
 165         fsinf->vol_serial_number = tcon->vol_serial_number;
 166         fsinf->vol_create_time = le64_to_cpu(tcon->vol_create_time);
 167         fsinf->share_flags = tcon->share_flags;
 168         fsinf->share_caps = le32_to_cpu(tcon->capabilities);
 169         fsinf->sector_flags = tcon->ss_flags;
 170         fsinf->optimal_sector_size = tcon->perf_sector_size;
 171         fsinf->max_bytes_chunk = tcon->max_bytes_chunk;
 172         fsinf->maximal_access = tcon->maximal_access;
 173 #endif /* SMB2 */
 174         fsinf->cifs_posix_caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
 175
 176         if (copy_to_user(arg, fsinf, sizeof(struct smb_mnt_fs_info)))
 177                 rc = -EFAULT;
 178
 179         kfree(fsinf);
 180         return rc;
 181 }
 182
 183 long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
 184 {
 185         struct inode *inode = file_inode(filep);
 186         int rc = -ENOTTY; /* strange error - but the precedent */
 187         unsigned int xid;
 188         struct cifs_sb_info *cifs_sb;
 189         struct cifsFileInfo *pSMBFile = filep->private_data;
 190         struct cifs_tcon *tcon;
 191         __u64   ExtAttrBits = 0;
 192         __u64   caps;
 193
 194         xid = get_xid();
 195
 196         cifs_sb = CIFS_SB(inode->i_sb);
 197
 198         switch (command) {
 199                 case FS_IOC_GETFLAGS:
 200                         if (pSMBFile == NULL)
 201                                 break;
 202                         tcon = tlink_tcon(pSMBFile->tlink);
 203                         caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
 204 #ifdef CONFIG_CIFS_POSIX
 205                         if (CIFS_UNIX_EXTATTR_CAP & caps) {
 206                                 __u64   ExtAttrMask = 0;
 207                                 rc = CIFSGetExtAttr(xid, tcon,
 208                                                     pSMBFile->fid.netfid,
 209                                                     &ExtAttrBits, &ExtAttrMask);
 210                                 if (rc == 0)
 211                                         rc = put_user(ExtAttrBits &
 212                                                 FS_FL_USER_VISIBLE,
 213                                                 (int __user *)arg);
 214                                 if (rc != EOPNOTSUPP)
 215                                         break;
 216                         }
 217 #endif /* CONFIG_CIFS_POSIX */
 218                         rc = 0;
 219                         if (CIFS_I(inode)->cifsAttrs & ATTR_COMPRESSED) {
 220                                 /* add in the compressed bit */
 221                                 ExtAttrBits = FS_COMPR_FL;
 222                                 rc = put_user(ExtAttrBits & FS_FL_USER_VISIBLE,
 223                                               (int __user *)arg);
 224                         }
 225                         break;
 226                 case FS_IOC_SETFLAGS:
 227                         if (pSMBFile == NULL)
 228                                 break;
 229                         tcon = tlink_tcon(pSMBFile->tlink);
 230                         caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
 231
 232                         if (get_user(ExtAttrBits, (int __user *)arg)) {
 233                                 rc = -EFAULT;
 234                                 break;
 235                         }
 236
 237                         /*
 238                          * if (CIFS_UNIX_EXTATTR_CAP & caps)
 239                          *      rc = CIFSSetExtAttr(xid, tcon,
 240                          *                     pSMBFile->fid.netfid,
 241                          *                     extAttrBits,
 242                          *                     &ExtAttrMask);
 243                          * if (rc != EOPNOTSUPP)
 244                          *      break;
 245                          */
 246
 247                         /* Currently only flag we can set is compressed flag */
 248                         if ((ExtAttrBits & FS_COMPR_FL) == 0)
 249                                 break;
 250
 251                         /* Try to set compress flag */
 252                         if (tcon->ses->server->ops->set_compression) {
 253                                 rc = tcon->ses->server->ops->set_compression(
 254                                                         xid, tcon, pSMBFile);
 255                                 cifs_dbg(FYI, "set compress flag rc %d\n", rc);
 256                         }
 257                         break;
 258                 case CIFS_IOC_COPYCHUNK_FILE:
 259                         rc = cifs_ioctl_clone(xid, filep, arg, 0, 0, 0, false);
 260                         break;
 261                 case BTRFS_IOC_CLONE:
 262                         rc = cifs_ioctl_clone(xid, filep, arg, 0, 0, 0, true);
 263                         break;
 264                 case CIFS_IOC_SET_INTEGRITY:
 265                         if (pSMBFile == NULL)
 266                                 break;
 267                         tcon = tlink_tcon(pSMBFile->tlink);
 268                         if (tcon->ses->server->ops->set_integrity)
 269                                 rc = tcon->ses->server->ops->set_integrity(xid,
 270                                                 tcon, pSMBFile);
 271                         else
 272                                 rc = -EOPNOTSUPP;
 273                         break;
 274                 case CIFS_IOC_GET_MNT_INFO:
 275                         tcon = tlink_tcon(pSMBFile->tlink);
 276                         rc = smb_mnt_get_fsinfo(xid, tcon, (void __user *)arg);
 277                         break;
 278                 default:
 279                         cifs_dbg(FYI, "unsupported ioctl\n");
 280                         break;
 281         }
 282
 283         free_xid(xid);
 284         return rc;
 285 }