fs/cifs/inode.c

   1 /*
   2  *   fs/cifs/inode.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2002,2010
   5  *   Author(s): Steve French (sfrench@us.ibm.com)
   6  *
   7  *   This library is free software; you can redistribute it and/or modify
   8  *   it under the terms of the GNU Lesser General Public License as published
   9  *   by the Free Software Foundation; either version 2.1 of the License, or
  10  *   (at your option) any later version.
  11  *
  12  *   This library is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  15  *   the GNU Lesser General Public License for more details.
  16  *
  17  *   You should have received a copy of the GNU Lesser General Public License
  18  *   along with this library; if not, write to the Free Software
  19  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  20  */
  21 #include <linux/fs.h>
  22 #include <linux/stat.h>
  23 #include <linux/slab.h>
  24 #include <linux/pagemap.h>
  25 #include <asm/div64.h>
  26 #include "cifsfs.h"
  27 #include "cifspdu.h"
  28 #include "cifsglob.h"
  29 #include "cifsproto.h"
  30 #include "cifs_debug.h"
  31 #include "cifs_fs_sb.h"
  32 #include "fscache.h"
  33
  34
  35 static void cifs_set_ops(struct inode *inode)
  36 {
  37         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
  38
  39         switch (inode->i_mode & S_IFMT) {
  40         case S_IFREG:
  41                 inode->i_op = &cifs_file_inode_ops;
  42                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
  43                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
  44                                 inode->i_fop = &cifs_file_direct_nobrl_ops;
  45                         else
  46                                 inode->i_fop = &cifs_file_direct_ops;
  47                 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) {
  48                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
  49                                 inode->i_fop = &cifs_file_strict_nobrl_ops;
  50                         else
  51                                 inode->i_fop = &cifs_file_strict_ops;
  52                 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
  53                         inode->i_fop = &cifs_file_nobrl_ops;
  54                 else { /* not direct, send byte range locks */
  55                         inode->i_fop = &cifs_file_ops;
  56                 }
  57
  58                 /* check if server can support readpages */
  59                 if (cifs_sb_master_tcon(cifs_sb)->ses->server->maxBuf <
  60                                 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE)
  61                         inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
  62                 else
  63                         inode->i_data.a_ops = &cifs_addr_ops;
  64                 break;
  65         case S_IFDIR:
  66 #ifdef CONFIG_CIFS_DFS_UPCALL
  67                 if (IS_AUTOMOUNT(inode)) {
  68                         inode->i_op = &cifs_dfs_referral_inode_operations;
  69                 } else {
  70 #else /* NO DFS support, treat as a directory */
  71                 {
  72 #endif
  73                         inode->i_op = &cifs_dir_inode_ops;
  74                         inode->i_fop = &cifs_dir_ops;
  75                 }
  76                 break;
  77         case S_IFLNK:
  78                 inode->i_op = &cifs_symlink_inode_ops;
  79                 break;
  80         default:
  81                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
  82                 break;
  83         }
  84 }
  85
  86 /* check inode attributes against fattr. If they don't match, tag the
  87  * inode for cache invalidation
  88  */
  89 static void
  90 cifs_revalidate_cache(struct inode *inode, struct cifs_fattr *fattr)
  91 {
  92         struct cifsInodeInfo *cifs_i = CIFS_I(inode);
  93
  94         cFYI(1, "%s: revalidating inode %llu", __func__, cifs_i->uniqueid);
  95
  96         if (inode->i_state & I_NEW) {
  97                 cFYI(1, "%s: inode %llu is new", __func__, cifs_i->uniqueid);
  98                 return;
  99         }
 100
 101         /* don't bother with revalidation if we have an oplock */
 102         if (cifs_i->clientCanCacheRead) {
 103                 cFYI(1, "%s: inode %llu is oplocked", __func__,
 104                          cifs_i->uniqueid);
 105                 return;
 106         }
 107
 108          /* revalidate if mtime or size have changed */
 109         if (timespec_equal(&inode->i_mtime, &fattr->cf_mtime) &&
 110             cifs_i->server_eof == fattr->cf_eof) {
 111                 cFYI(1, "%s: inode %llu is unchanged", __func__,
 112                          cifs_i->uniqueid);
 113                 return;
 114         }
 115
 116         cFYI(1, "%s: invalidating inode %llu mapping", __func__,
 117                  cifs_i->uniqueid);
 118         cifs_i->invalid_mapping = true;
 119 }
 120
 121 /* populate an inode with info from a cifs_fattr struct */
 122 void
 123 cifs_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr)
 124 {
 125         struct cifsInodeInfo *cifs_i = CIFS_I(inode);
 126         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 127
 128         cifs_revalidate_cache(inode, fattr);
 129
 130         spin_lock(&inode->i_lock);
 131         inode->i_atime = fattr->cf_atime;
 132         inode->i_mtime = fattr->cf_mtime;
 133         inode->i_ctime = fattr->cf_ctime;
 134         inode->i_rdev = fattr->cf_rdev;
 135         set_nlink(inode, fattr->cf_nlink);
 136         inode->i_uid = fattr->cf_uid;
 137         inode->i_gid = fattr->cf_gid;
 138
 139         /* if dynperm is set, don't clobber existing mode */
 140         if (inode->i_state & I_NEW ||
 141             !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM))
 142                 inode->i_mode = fattr->cf_mode;
 143
 144         cifs_i->cifsAttrs = fattr->cf_cifsattrs;
 145
 146         if (fattr->cf_flags & CIFS_FATTR_NEED_REVAL)
 147                 cifs_i->time = 0;
 148         else
 149                 cifs_i->time = jiffies;
 150
 151         cifs_i->delete_pending = fattr->cf_flags & CIFS_FATTR_DELETE_PENDING;
 152
 153         cifs_i->server_eof = fattr->cf_eof;
 154         /*
 155          * Can't safely change the file size here if the client is writing to
 156          * it due to potential races.
 157          */
 158         if (is_size_safe_to_change(cifs_i, fattr->cf_eof)) {
 159                 i_size_write(inode, fattr->cf_eof);
 160
 161                 /*
 162                  * i_blocks is not related to (i_size / i_blksize),
 163                  * but instead 512 byte (2**9) size is required for
 164                  * calculating num blocks.
 165                  */
 166                 inode->i_blocks = (512 - 1 + fattr->cf_bytes) >> 9;
 167         }
 168         spin_unlock(&inode->i_lock);
 169
 170         if (fattr->cf_flags & CIFS_FATTR_DFS_REFERRAL)
 171                 inode->i_flags |= S_AUTOMOUNT;
 172         cifs_set_ops(inode);
 173 }
 174
 175 void
 176 cifs_fill_uniqueid(struct super_block *sb, struct cifs_fattr *fattr)
 177 {
 178         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 179
 180         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 181                 return;
 182
 183         fattr->cf_uniqueid = iunique(sb, ROOT_I);
 184 }
 185
 186 /* Fill a cifs_fattr struct with info from FILE_UNIX_BASIC_INFO. */
 187 void
 188 cifs_unix_basic_to_fattr(struct cifs_fattr *fattr, FILE_UNIX_BASIC_INFO *info,
 189                          struct cifs_sb_info *cifs_sb)
 190 {
 191         memset(fattr, 0, sizeof(*fattr));
 192         fattr->cf_uniqueid = le64_to_cpu(info->UniqueId);
 193         fattr->cf_bytes = le64_to_cpu(info->NumOfBytes);
 194         fattr->cf_eof = le64_to_cpu(info->EndOfFile);
 195
 196         fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
 197         fattr->cf_mtime = cifs_NTtimeToUnix(info->LastModificationTime);
 198         fattr->cf_ctime = cifs_NTtimeToUnix(info->LastStatusChange);
 199         fattr->cf_mode = le64_to_cpu(info->Permissions);
 200
 201         /*
 202          * Since we set the inode type below we need to mask off
 203          * to avoid strange results if bits set above.
 204          */
 205         fattr->cf_mode &= ~S_IFMT;
 206         switch (le32_to_cpu(info->Type)) {
 207         case UNIX_FILE:
 208                 fattr->cf_mode |= S_IFREG;
 209                 fattr->cf_dtype = DT_REG;
 210                 break;
 211         case UNIX_SYMLINK:
 212                 fattr->cf_mode |= S_IFLNK;
 213                 fattr->cf_dtype = DT_LNK;
 214                 break;
 215         case UNIX_DIR:
 216                 fattr->cf_mode |= S_IFDIR;
 217                 fattr->cf_dtype = DT_DIR;
 218                 break;
 219         case UNIX_CHARDEV:
 220                 fattr->cf_mode |= S_IFCHR;
 221                 fattr->cf_dtype = DT_CHR;
 222                 fattr->cf_rdev = MKDEV(le64_to_cpu(info->DevMajor),
 223                                        le64_to_cpu(info->DevMinor) & MINORMASK);
 224                 break;
 225         case UNIX_BLOCKDEV:
 226                 fattr->cf_mode |= S_IFBLK;
 227                 fattr->cf_dtype = DT_BLK;
 228                 fattr->cf_rdev = MKDEV(le64_to_cpu(info->DevMajor),
 229                                        le64_to_cpu(info->DevMinor) & MINORMASK);
 230                 break;
 231         case UNIX_FIFO:
 232                 fattr->cf_mode |= S_IFIFO;
 233                 fattr->cf_dtype = DT_FIFO;
 234                 break;
 235         case UNIX_SOCKET:
 236                 fattr->cf_mode |= S_IFSOCK;
 237                 fattr->cf_dtype = DT_SOCK;
 238                 break;
 239         default:
 240                 /* safest to call it a file if we do not know */
 241                 fattr->cf_mode |= S_IFREG;
 242                 fattr->cf_dtype = DT_REG;
 243                 cFYI(1, "unknown type %d", le32_to_cpu(info->Type));
 244                 break;
 245         }
 246
 247         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
 248                 fattr->cf_uid = cifs_sb->mnt_uid;
 249         else
 250                 fattr->cf_uid = le64_to_cpu(info->Uid);
 251
 252         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
 253                 fattr->cf_gid = cifs_sb->mnt_gid;
 254         else
 255                 fattr->cf_gid = le64_to_cpu(info->Gid);
 256
 257         fattr->cf_nlink = le64_to_cpu(info->Nlinks);
 258 }
 259
 260 /*
 261  * Fill a cifs_fattr struct with fake inode info.
 262  *
 263  * Needed to setup cifs_fattr data for the directory which is the
 264  * junction to the new submount (ie to setup the fake directory
 265  * which represents a DFS referral).
 266  */
 267 static void
 268 cifs_create_dfs_fattr(struct cifs_fattr *fattr, struct super_block *sb)
 269 {
 270         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 271
 272         cFYI(1, "creating fake fattr for DFS referral");
 273
 274         memset(fattr, 0, sizeof(*fattr));
 275         fattr->cf_mode = S_IFDIR | S_IXUGO | S_IRWXU;
 276         fattr->cf_uid = cifs_sb->mnt_uid;
 277         fattr->cf_gid = cifs_sb->mnt_gid;
 278         fattr->cf_atime = CURRENT_TIME;
 279         fattr->cf_ctime = CURRENT_TIME;
 280         fattr->cf_mtime = CURRENT_TIME;
 281         fattr->cf_nlink = 2;
 282         fattr->cf_flags |= CIFS_FATTR_DFS_REFERRAL;
 283 }
 284
 285 static int
 286 cifs_get_file_info_unix(struct file *filp)
 287 {
 288         int rc;
 289         unsigned int xid;
 290         FILE_UNIX_BASIC_INFO find_data;
 291         struct cifs_fattr fattr;
 292         struct inode *inode = filp->f_path.dentry->d_inode;
 293         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 294         struct cifsFileInfo *cfile = filp->private_data;
 295         struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
 296
 297         xid = get_xid();
 298         rc = CIFSSMBUnixQFileInfo(xid, tcon, cfile->fid.netfid, &find_data);
 299         if (!rc) {
 300                 cifs_unix_basic_to_fattr(&fattr, &find_data, cifs_sb);
 301         } else if (rc == -EREMOTE) {
 302                 cifs_create_dfs_fattr(&fattr, inode->i_sb);
 303                 rc = 0;
 304         }
 305
 306         cifs_fattr_to_inode(inode, &fattr);
 307         free_xid(xid);
 308         return rc;
 309 }
 310
 311 int cifs_get_inode_info_unix(struct inode **pinode,
 312                              const unsigned char *full_path,
 313                              struct super_block *sb, unsigned int xid)
 314 {
 315         int rc;
 316         FILE_UNIX_BASIC_INFO find_data;
 317         struct cifs_fattr fattr;
 318         struct cifs_tcon *tcon;
 319         struct tcon_link *tlink;
 320         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 321
 322         cFYI(1, "Getting info on %s", full_path);
 323
 324         tlink = cifs_sb_tlink(cifs_sb);
 325         if (IS_ERR(tlink))
 326                 return PTR_ERR(tlink);
 327         tcon = tlink_tcon(tlink);
 328
 329         /* could have done a find first instead but this returns more info */
 330         rc = CIFSSMBUnixQPathInfo(xid, tcon, full_path, &find_data,
 331                                   cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
 332                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 333         cifs_put_tlink(tlink);
 334
 335         if (!rc) {
 336                 cifs_unix_basic_to_fattr(&fattr, &find_data, cifs_sb);
 337         } else if (rc == -EREMOTE) {
 338                 cifs_create_dfs_fattr(&fattr, sb);
 339                 rc = 0;
 340         } else {
 341                 return rc;
 342         }
 343
 344         /* check for Minshall+French symlinks */
 345         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
 346                 int tmprc = CIFSCheckMFSymlink(&fattr, full_path, cifs_sb, xid);
 347                 if (tmprc)
 348                         cFYI(1, "CIFSCheckMFSymlink: %d", tmprc);
 349         }
 350
 351         if (*pinode == NULL) {
 352                 /* get new inode */
 353                 cifs_fill_uniqueid(sb, &fattr);
 354                 *pinode = cifs_iget(sb, &fattr);
 355                 if (!*pinode)
 356                         rc = -ENOMEM;
 357         } else {
 358                 /* we already have inode, update it */
 359                 cifs_fattr_to_inode(*pinode, &fattr);
 360         }
 361
 362         return rc;
 363 }
 364
 365 static int
 366 cifs_sfu_type(struct cifs_fattr *fattr, const unsigned char *path,
 367               struct cifs_sb_info *cifs_sb, unsigned int xid)
 368 {
 369         int rc;
 370         int oplock = 0;
 371         __u16 netfid;
 372         struct tcon_link *tlink;
 373         struct cifs_tcon *tcon;
 374         struct cifs_io_parms io_parms;
 375         char buf[24];
 376         unsigned int bytes_read;
 377         char *pbuf;
 378
 379         pbuf = buf;
 380
 381         fattr->cf_mode &= ~S_IFMT;
 382
 383         if (fattr->cf_eof == 0) {
 384                 fattr->cf_mode |= S_IFIFO;
 385                 fattr->cf_dtype = DT_FIFO;
 386                 return 0;
 387         } else if (fattr->cf_eof < 8) {
 388                 fattr->cf_mode |= S_IFREG;
 389                 fattr->cf_dtype = DT_REG;
 390                 return -EINVAL;  /* EOPNOTSUPP? */
 391         }
 392
 393         tlink = cifs_sb_tlink(cifs_sb);
 394         if (IS_ERR(tlink))
 395                 return PTR_ERR(tlink);
 396         tcon = tlink_tcon(tlink);
 397
 398         rc = CIFSSMBOpen(xid, tcon, path, FILE_OPEN, GENERIC_READ,
 399                          CREATE_NOT_DIR, &netfid, &oplock, NULL,
 400                          cifs_sb->local_nls,
 401                          cifs_sb->mnt_cifs_flags &
 402                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 403         if (rc == 0) {
 404                 int buf_type = CIFS_NO_BUFFER;
 405                         /* Read header */
 406                 io_parms.netfid = netfid;
 407                 io_parms.pid = current->tgid;
 408                 io_parms.tcon = tcon;
 409                 io_parms.offset = 0;
 410                 io_parms.length = 24;
 411                 rc = CIFSSMBRead(xid, &io_parms, &bytes_read, &pbuf,
 412                                  &buf_type);
 413                 if ((rc == 0) && (bytes_read >= 8)) {
 414                         if (memcmp("IntxBLK", pbuf, 8) == 0) {
 415                                 cFYI(1, "Block device");
 416                                 fattr->cf_mode |= S_IFBLK;
 417                                 fattr->cf_dtype = DT_BLK;
 418                                 if (bytes_read == 24) {
 419                                         /* we have enough to decode dev num */
 420                                         __u64 mjr; /* major */
 421                                         __u64 mnr; /* minor */
 422                                         mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
 423                                         mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
 424                                         fattr->cf_rdev = MKDEV(mjr, mnr);
 425                                 }
 426                         } else if (memcmp("IntxCHR", pbuf, 8) == 0) {
 427                                 cFYI(1, "Char device");
 428                                 fattr->cf_mode |= S_IFCHR;
 429                                 fattr->cf_dtype = DT_CHR;
 430                                 if (bytes_read == 24) {
 431                                         /* we have enough to decode dev num */
 432                                         __u64 mjr; /* major */
 433                                         __u64 mnr; /* minor */
 434                                         mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
 435                                         mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
 436                                         fattr->cf_rdev = MKDEV(mjr, mnr);
 437                                 }
 438                         } else if (memcmp("IntxLNK", pbuf, 7) == 0) {
 439                                 cFYI(1, "Symlink");
 440                                 fattr->cf_mode |= S_IFLNK;
 441                                 fattr->cf_dtype = DT_LNK;
 442                         } else {
 443                                 fattr->cf_mode |= S_IFREG; /* file? */
 444                                 fattr->cf_dtype = DT_REG;
 445                                 rc = -EOPNOTSUPP;
 446                         }
 447                 } else {
 448                         fattr->cf_mode |= S_IFREG; /* then it is a file */
 449                         fattr->cf_dtype = DT_REG;
 450                         rc = -EOPNOTSUPP; /* or some unknown SFU type */
 451                 }
 452                 CIFSSMBClose(xid, tcon, netfid);
 453         }
 454         cifs_put_tlink(tlink);
 455         return rc;
 456 }
 457
 458 #define SFBITS_MASK (S_ISVTX | S_ISGID | S_ISUID)  /* SETFILEBITS valid bits */
 459
 460 /*
 461  * Fetch mode bits as provided by SFU.
 462  *
 463  * FIXME: Doesn't this clobber the type bit we got from cifs_sfu_type ?
 464  */
 465 static int cifs_sfu_mode(struct cifs_fattr *fattr, const unsigned char *path,
 466                          struct cifs_sb_info *cifs_sb, unsigned int xid)
 467 {
 468 #ifdef CONFIG_CIFS_XATTR
 469         ssize_t rc;
 470         char ea_value[4];
 471         __u32 mode;
 472         struct tcon_link *tlink;
 473         struct cifs_tcon *tcon;
 474
 475         tlink = cifs_sb_tlink(cifs_sb);
 476         if (IS_ERR(tlink))
 477                 return PTR_ERR(tlink);
 478         tcon = tlink_tcon(tlink);
 479
 480         rc = CIFSSMBQAllEAs(xid, tcon, path, "SETFILEBITS",
 481                             ea_value, 4 /* size of buf */, cifs_sb->local_nls,
 482                             cifs_sb->mnt_cifs_flags &
 483                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 484         cifs_put_tlink(tlink);
 485         if (rc < 0)
 486                 return (int)rc;
 487         else if (rc > 3) {
 488                 mode = le32_to_cpu(*((__le32 *)ea_value));
 489                 fattr->cf_mode &= ~SFBITS_MASK;
 490                 cFYI(1, "special bits 0%o org mode 0%o", mode,
 491                          fattr->cf_mode);
 492                 fattr->cf_mode = (mode & SFBITS_MASK) | fattr->cf_mode;
 493                 cFYI(1, "special mode bits 0%o", mode);
 494         }
 495
 496         return 0;
 497 #else
 498         return -EOPNOTSUPP;
 499 #endif
 500 }
 501
 502 /* Fill a cifs_fattr struct with info from FILE_ALL_INFO */
 503 static void
 504 cifs_all_info_to_fattr(struct cifs_fattr *fattr, FILE_ALL_INFO *info,
 505                        struct cifs_sb_info *cifs_sb, bool adjust_tz)
 506 {
 507         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
 508
 509         memset(fattr, 0, sizeof(*fattr));
 510         fattr->cf_cifsattrs = le32_to_cpu(info->Attributes);
 511         if (info->DeletePending)
 512                 fattr->cf_flags |= CIFS_FATTR_DELETE_PENDING;
 513
 514         if (info->LastAccessTime)
 515                 fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
 516         else
 517                 fattr->cf_atime = CURRENT_TIME;
 518
 519         fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime);
 520         fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
 521
 522         if (adjust_tz) {
 523                 fattr->cf_ctime.tv_sec += tcon->ses->server->timeAdj;
 524                 fattr->cf_mtime.tv_sec += tcon->ses->server->timeAdj;
 525         }
 526
 527         fattr->cf_eof = le64_to_cpu(info->EndOfFile);
 528         fattr->cf_bytes = le64_to_cpu(info->AllocationSize);
 529         fattr->cf_createtime = le64_to_cpu(info->CreationTime);
 530
 531         if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
 532                 fattr->cf_mode = S_IFDIR | cifs_sb->mnt_dir_mode;
 533                 fattr->cf_dtype = DT_DIR;
 534                 /*
 535                  * Server can return wrong NumberOfLinks value for directories
 536                  * when Unix extensions are disabled - fake it.
 537                  */
 538                 fattr->cf_nlink = 2;
 539         } else {
 540                 fattr->cf_mode = S_IFREG | cifs_sb->mnt_file_mode;
 541                 fattr->cf_dtype = DT_REG;
 542
 543                 /* clear write bits if ATTR_READONLY is set */
 544                 if (fattr->cf_cifsattrs & ATTR_READONLY)
 545                         fattr->cf_mode &= ~(S_IWUGO);
 546
 547                 fattr->cf_nlink = le32_to_cpu(info->NumberOfLinks);
 548         }
 549
 550         fattr->cf_uid = cifs_sb->mnt_uid;
 551         fattr->cf_gid = cifs_sb->mnt_gid;
 552 }
 553
 554 static int
 555 cifs_get_file_info(struct file *filp)
 556 {
 557         int rc;
 558         unsigned int xid;
 559         FILE_ALL_INFO find_data;
 560         struct cifs_fattr fattr;
 561         struct inode *inode = filp->f_path.dentry->d_inode;
 562         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 563         struct cifsFileInfo *cfile = filp->private_data;
 564         struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
 565         struct TCP_Server_Info *server = tcon->ses->server;
 566
 567         if (!server->ops->query_file_info)
 568                 return -ENOSYS;
 569
 570         xid = get_xid();
 571         rc = server->ops->query_file_info(xid, tcon, &cfile->fid, &find_data);
 572         switch (rc) {
 573         case 0:
 574                 cifs_all_info_to_fattr(&fattr, &find_data, cifs_sb, false);
 575                 break;
 576         case -EREMOTE:
 577                 cifs_create_dfs_fattr(&fattr, inode->i_sb);
 578                 rc = 0;
 579                 break;
 580         case -EOPNOTSUPP:
 581         case -EINVAL:
 582                 /*
 583                  * FIXME: legacy server -- fall back to path-based call?
 584                  * for now, just skip revalidating and mark inode for
 585                  * immediate reval.
 586                  */
 587                 rc = 0;
 588                 CIFS_I(inode)->time = 0;
 589         default:
 590                 goto cgfi_exit;
 591         }
 592
 593         /*
 594          * don't bother with SFU junk here -- just mark inode as needing
 595          * revalidation.
 596          */
 597         fattr.cf_uniqueid = CIFS_I(inode)->uniqueid;
 598         fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
 599         cifs_fattr_to_inode(inode, &fattr);
 600 cgfi_exit:
 601         free_xid(xid);
 602         return rc;
 603 }
 604
 605 int
 606 cifs_get_inode_info(struct inode **inode, const char *full_path,
 607                     FILE_ALL_INFO *data, struct super_block *sb, int xid,
 608                     const __u16 *fid)
 609 {
 610         int rc = 0, tmprc;
 611         struct cifs_tcon *tcon;
 612         struct TCP_Server_Info *server;
 613         struct tcon_link *tlink;
 614         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 615         char *buf = NULL;
 616         bool adjust_tz = false;
 617         struct cifs_fattr fattr;
 618
 619         tlink = cifs_sb_tlink(cifs_sb);
 620         if (IS_ERR(tlink))
 621                 return PTR_ERR(tlink);
 622         tcon = tlink_tcon(tlink);
 623         server = tcon->ses->server;
 624
 625         cFYI(1, "Getting info on %s", full_path);
 626
 627         if ((data == NULL) && (*inode != NULL)) {
 628                 if (CIFS_I(*inode)->clientCanCacheRead) {
 629                         cFYI(1, "No need to revalidate cached inode sizes");
 630                         goto cgii_exit;
 631                 }
 632         }
 633
 634         /* if inode info is not passed, get it from server */
 635         if (data == NULL) {
 636                 if (!server->ops->query_path_info) {
 637                         rc = -ENOSYS;
 638                         goto cgii_exit;
 639                 }
 640                 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
 641                 if (buf == NULL) {
 642                         rc = -ENOMEM;
 643                         goto cgii_exit;
 644                 }
 645                 data = (FILE_ALL_INFO *)buf;
 646                 rc = server->ops->query_path_info(xid, tcon, cifs_sb, full_path,
 647                                                   data, &adjust_tz);
 648         }
 649
 650         if (!rc) {
 651                 cifs_all_info_to_fattr(&fattr, (FILE_ALL_INFO *)data, cifs_sb,
 652                                        adjust_tz);
 653         } else if (rc == -EREMOTE) {
 654                 cifs_create_dfs_fattr(&fattr, sb);
 655                 rc = 0;
 656         } else {
 657                 goto cgii_exit;
 658         }
 659
 660         /*
 661          * If an inode wasn't passed in, then get the inode number
 662          *
 663          * Is an i_ino of zero legal? Can we use that to check if the server
 664          * supports returning inode numbers?  Are there other sanity checks we
 665          * can use to ensure that the server is really filling in that field?
 666          */
 667         if (*inode == NULL) {
 668                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 669                         if (server->ops->get_srv_inum)
 670                                 tmprc = server->ops->get_srv_inum(xid, tcon,
 671                                         cifs_sb, full_path, &fattr.cf_uniqueid,
 672                                         data);
 673                         else
 674                                 tmprc = -ENOSYS;
 675                         if (tmprc || !fattr.cf_uniqueid) {
 676                                 cFYI(1, "GetSrvInodeNum rc %d", tmprc);
 677                                 fattr.cf_uniqueid = iunique(sb, ROOT_I);
 678                                 cifs_autodisable_serverino(cifs_sb);
 679                         }
 680                 } else {
 681                         fattr.cf_uniqueid = iunique(sb, ROOT_I);
 682                 }
 683         } else {
 684                 fattr.cf_uniqueid = CIFS_I(*inode)->uniqueid;
 685         }
 686
 687         /* query for SFU type info if supported and needed */
 688         if (fattr.cf_cifsattrs & ATTR_SYSTEM &&
 689             cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
 690                 tmprc = cifs_sfu_type(&fattr, full_path, cifs_sb, xid);
 691                 if (tmprc)
 692                         cFYI(1, "cifs_sfu_type failed: %d", tmprc);
 693         }
 694
 695 #ifdef CONFIG_CIFS_ACL
 696         /* fill in 0777 bits from ACL */
 697         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
 698                 rc = cifs_acl_to_fattr(cifs_sb, &fattr, *inode, full_path, fid);
 699                 if (rc) {
 700                         cFYI(1, "%s: Getting ACL failed with error: %d",
 701                                 __func__, rc);
 702                         goto cgii_exit;
 703                 }
 704         }
 705 #endif /* CONFIG_CIFS_ACL */
 706
 707         /* fill in remaining high mode bits e.g. SUID, VTX */
 708         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
 709                 cifs_sfu_mode(&fattr, full_path, cifs_sb, xid);
 710
 711         /* check for Minshall+French symlinks */
 712         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
 713                 tmprc = CIFSCheckMFSymlink(&fattr, full_path, cifs_sb, xid);
 714                 if (tmprc)
 715                         cFYI(1, "CIFSCheckMFSymlink: %d", tmprc);
 716         }
 717
 718         if (!*inode) {
 719                 *inode = cifs_iget(sb, &fattr);
 720                 if (!*inode)
 721                         rc = -ENOMEM;
 722         } else {
 723                 cifs_fattr_to_inode(*inode, &fattr);
 724         }
 725
 726 cgii_exit:
 727         kfree(buf);
 728         cifs_put_tlink(tlink);
 729         return rc;
 730 }
 731
 732 static const struct inode_operations cifs_ipc_inode_ops = {
 733         .lookup = cifs_lookup,
 734 };
 735
 736 static int
 737 cifs_find_inode(struct inode *inode, void *opaque)
 738 {
 739         struct cifs_fattr *fattr = (struct cifs_fattr *) opaque;
 740
 741         /* don't match inode with different uniqueid */
 742         if (CIFS_I(inode)->uniqueid != fattr->cf_uniqueid)
 743                 return 0;
 744
 745         /* use createtime like an i_generation field */
 746         if (CIFS_I(inode)->createtime != fattr->cf_createtime)
 747                 return 0;
 748
 749         /* don't match inode of different type */
 750         if ((inode->i_mode & S_IFMT) != (fattr->cf_mode & S_IFMT))
 751                 return 0;
 752
 753         /* if it's not a directory or has no dentries, then flag it */
 754         if (S_ISDIR(inode->i_mode) && !hlist_empty(&inode->i_dentry))
 755                 fattr->cf_flags |= CIFS_FATTR_INO_COLLISION;
 756
 757         return 1;
 758 }
 759
 760 static int
 761 cifs_init_inode(struct inode *inode, void *opaque)
 762 {
 763         struct cifs_fattr *fattr = (struct cifs_fattr *) opaque;
 764
 765         CIFS_I(inode)->uniqueid = fattr->cf_uniqueid;
 766         CIFS_I(inode)->createtime = fattr->cf_createtime;
 767         return 0;
 768 }
 769
 770 /*
 771  * walk dentry list for an inode and report whether it has aliases that
 772  * are hashed. We use this to determine if a directory inode can actually
 773  * be used.
 774  */
 775 static bool
 776 inode_has_hashed_dentries(struct inode *inode)
 777 {
 778         struct dentry *dentry;
 779         struct hlist_node *p;
 780
 781         spin_lock(&inode->i_lock);
 782         hlist_for_each_entry(dentry, p, &inode->i_dentry, d_alias) {
 783                 if (!d_unhashed(dentry) || IS_ROOT(dentry)) {
 784                         spin_unlock(&inode->i_lock);
 785                         return true;
 786                 }
 787         }
 788         spin_unlock(&inode->i_lock);
 789         return false;
 790 }
 791
 792 /* Given fattrs, get a corresponding inode */
 793 struct inode *
 794 cifs_iget(struct super_block *sb, struct cifs_fattr *fattr)
 795 {
 796         unsigned long hash;
 797         struct inode *inode;
 798
 799 retry_iget5_locked:
 800         cFYI(1, "looking for uniqueid=%llu", fattr->cf_uniqueid);
 801
 802         /* hash down to 32-bits on 32-bit arch */
 803         hash = cifs_uniqueid_to_ino_t(fattr->cf_uniqueid);
 804
 805         inode = iget5_locked(sb, hash, cifs_find_inode, cifs_init_inode, fattr);
 806         if (inode) {
 807                 /* was there a potentially problematic inode collision? */
 808                 if (fattr->cf_flags & CIFS_FATTR_INO_COLLISION) {
 809                         fattr->cf_flags &= ~CIFS_FATTR_INO_COLLISION;
 810
 811                         if (inode_has_hashed_dentries(inode)) {
 812                                 cifs_autodisable_serverino(CIFS_SB(sb));
 813                                 iput(inode);
 814                                 fattr->cf_uniqueid = iunique(sb, ROOT_I);
 815                                 goto retry_iget5_locked;
 816                         }
 817                 }
 818
 819                 cifs_fattr_to_inode(inode, fattr);
 820                 if (sb->s_flags & MS_NOATIME)
 821                         inode->i_flags |= S_NOATIME | S_NOCMTIME;
 822                 if (inode->i_state & I_NEW) {
 823                         inode->i_ino = hash;
 824                         if (S_ISREG(inode->i_mode))
 825                                 inode->i_data.backing_dev_info = sb->s_bdi;
 826 #ifdef CONFIG_CIFS_FSCACHE
 827                         /* initialize per-inode cache cookie pointer */
 828                         CIFS_I(inode)->fscache = NULL;
 829 #endif
 830                         unlock_new_inode(inode);
 831                 }
 832         }
 833
 834         return inode;
 835 }
 836
 837 /* gets root inode */
 838 struct inode *cifs_root_iget(struct super_block *sb)
 839 {
 840         unsigned int xid;
 841         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 842         struct inode *inode = NULL;
 843         long rc;
 844         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
 845
 846         xid = get_xid();
 847         if (tcon->unix_ext)
 848                 rc = cifs_get_inode_info_unix(&inode, "", sb, xid);
 849         else
 850                 rc = cifs_get_inode_info(&inode, "", NULL, sb, xid, NULL);
 851
 852         if (!inode) {
 853                 inode = ERR_PTR(rc);
 854                 goto out;
 855         }
 856
 857 #ifdef CONFIG_CIFS_FSCACHE
 858         /* populate tcon->resource_id */
 859         tcon->resource_id = CIFS_I(inode)->uniqueid;
 860 #endif
 861
 862         if (rc && tcon->ipc) {
 863                 cFYI(1, "ipc connection - fake read inode");
 864                 spin_lock(&inode->i_lock);
 865                 inode->i_mode |= S_IFDIR;
 866                 set_nlink(inode, 2);
 867                 inode->i_op = &cifs_ipc_inode_ops;
 868                 inode->i_fop = &simple_dir_operations;
 869                 inode->i_uid = cifs_sb->mnt_uid;
 870                 inode->i_gid = cifs_sb->mnt_gid;
 871                 spin_unlock(&inode->i_lock);
 872         } else if (rc) {
 873                 iget_failed(inode);
 874                 inode = ERR_PTR(rc);
 875         }
 876
 877 out:
 878         /* can not call macro free_xid here since in a void func
 879          * TODO: This is no longer true
 880          */
 881         _free_xid(xid);
 882         return inode;
 883 }
 884
 885 int
 886 cifs_set_file_info(struct inode *inode, struct iattr *attrs, unsigned int xid,
 887                    char *full_path, __u32 dosattr)
 888 {
 889         bool set_time = false;
 890         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 891         struct TCP_Server_Info *server;
 892         FILE_BASIC_INFO info_buf;
 893
 894         if (attrs == NULL)
 895                 return -EINVAL;
 896
 897         server = cifs_sb_master_tcon(cifs_sb)->ses->server;
 898         if (!server->ops->set_file_info)
 899                 return -ENOSYS;
 900
 901         if (attrs->ia_valid & ATTR_ATIME) {
 902                 set_time = true;
 903                 info_buf.LastAccessTime =
 904                         cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
 905         } else
 906                 info_buf.LastAccessTime = 0;
 907
 908         if (attrs->ia_valid & ATTR_MTIME) {
 909                 set_time = true;
 910                 info_buf.LastWriteTime =
 911                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
 912         } else
 913                 info_buf.LastWriteTime = 0;
 914
 915         /*
 916          * Samba throws this field away, but windows may actually use it.
 917          * Do not set ctime unless other time stamps are changed explicitly
 918          * (i.e. by utimes()) since we would then have a mix of client and
 919          * server times.
 920          */
 921         if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
 922                 cFYI(1, "CIFS - CTIME changed");
 923                 info_buf.ChangeTime =
 924                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
 925         } else
 926                 info_buf.ChangeTime = 0;
 927
 928         info_buf.CreationTime = 0;      /* don't change */
 929         info_buf.Attributes = cpu_to_le32(dosattr);
 930
 931         return server->ops->set_file_info(inode, full_path, &info_buf, xid);
 932 }
 933
 934 /*
 935  * Open the given file (if it isn't already), set the DELETE_ON_CLOSE bit
 936  * and rename it to a random name that hopefully won't conflict with
 937  * anything else.
 938  */
 939 int
 940 cifs_rename_pending_delete(const char *full_path, struct dentry *dentry,
 941                            const unsigned int xid)
 942 {
 943         int oplock = 0;
 944         int rc;
 945         __u16 netfid;
 946         struct inode *inode = dentry->d_inode;
 947         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
 948         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 949         struct tcon_link *tlink;
 950         struct cifs_tcon *tcon;
 951         __u32 dosattr, origattr;
 952         FILE_BASIC_INFO *info_buf = NULL;
 953
 954         tlink = cifs_sb_tlink(cifs_sb);
 955         if (IS_ERR(tlink))
 956                 return PTR_ERR(tlink);
 957         tcon = tlink_tcon(tlink);
 958
 959         rc = CIFSSMBOpen(xid, tcon, full_path, FILE_OPEN,
 960                          DELETE|FILE_WRITE_ATTRIBUTES, CREATE_NOT_DIR,
 961                          &netfid, &oplock, NULL, cifs_sb->local_nls,
 962                          cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 963         if (rc != 0)
 964                 goto out;
 965
 966         origattr = cifsInode->cifsAttrs;
 967         if (origattr == 0)
 968                 origattr |= ATTR_NORMAL;
 969
 970         dosattr = origattr & ~ATTR_READONLY;
 971         if (dosattr == 0)
 972                 dosattr |= ATTR_NORMAL;
 973         dosattr |= ATTR_HIDDEN;
 974
 975         /* set ATTR_HIDDEN and clear ATTR_READONLY, but only if needed */
 976         if (dosattr != origattr) {
 977                 info_buf = kzalloc(sizeof(*info_buf), GFP_KERNEL);
 978                 if (info_buf == NULL) {
 979                         rc = -ENOMEM;
 980                         goto out_close;
 981                 }
 982                 info_buf->Attributes = cpu_to_le32(dosattr);
 983                 rc = CIFSSMBSetFileInfo(xid, tcon, info_buf, netfid,
 984                                         current->tgid);
 985                 /* although we would like to mark the file hidden
 986                    if that fails we will still try to rename it */
 987                 if (rc != 0)
 988                         cifsInode->cifsAttrs = dosattr;
 989                 else
 990                         dosattr = origattr; /* since not able to change them */
 991         }
 992
 993         /* rename the file */
 994         rc = CIFSSMBRenameOpenFile(xid, tcon, netfid, NULL, cifs_sb->local_nls,
 995                                    cifs_sb->mnt_cifs_flags &
 996                                             CIFS_MOUNT_MAP_SPECIAL_CHR);
 997         if (rc != 0) {
 998                 rc = -ETXTBSY;
 999                 goto undo_setattr;
1000         }
1001
1002         /* try to set DELETE_ON_CLOSE */
1003         if (!cifsInode->delete_pending) {
1004                 rc = CIFSSMBSetFileDisposition(xid, tcon, true, netfid,
1005                                                current->tgid);
1006                 /*
1007                  * some samba versions return -ENOENT when we try to set the
1008                  * file disposition here. Likely a samba bug, but work around
1009                  * it for now. This means that some cifsXXX files may hang
1010                  * around after they shouldn't.
1011                  *
1012                  * BB: remove this hack after more servers have the fix
1013                  */
1014                 if (rc == -ENOENT)
1015                         rc = 0;
1016                 else if (rc != 0) {
1017                         rc = -ETXTBSY;
1018                         goto undo_rename;
1019                 }
1020                 cifsInode->delete_pending = true;
1021         }
1022
1023 out_close:
1024         CIFSSMBClose(xid, tcon, netfid);
1025 out:
1026         kfree(info_buf);
1027         cifs_put_tlink(tlink);
1028         return rc;
1029
1030         /*
1031          * reset everything back to the original state. Don't bother
1032          * dealing with errors here since we can't do anything about
1033          * them anyway.
1034          */
1035 undo_rename:
1036         CIFSSMBRenameOpenFile(xid, tcon, netfid, dentry->d_name.name,
1037                                 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1038                                             CIFS_MOUNT_MAP_SPECIAL_CHR);
1039 undo_setattr:
1040         if (dosattr != origattr) {
1041                 info_buf->Attributes = cpu_to_le32(origattr);
1042                 if (!CIFSSMBSetFileInfo(xid, tcon, info_buf, netfid,
1043                                         current->tgid))
1044                         cifsInode->cifsAttrs = origattr;
1045         }
1046
1047         goto out_close;
1048 }
1049
1050 /* copied from fs/nfs/dir.c with small changes */
1051 static void
1052 cifs_drop_nlink(struct inode *inode)
1053 {
1054         spin_lock(&inode->i_lock);
1055         if (inode->i_nlink > 0)
1056                 drop_nlink(inode);
1057         spin_unlock(&inode->i_lock);
1058 }
1059
1060 /*
1061  * If dentry->d_inode is null (usually meaning the cached dentry
1062  * is a negative dentry) then we would attempt a standard SMB delete, but
1063  * if that fails we can not attempt the fall back mechanisms on EACCESS
1064  * but will return the EACCESS to the caller. Note that the VFS does not call
1065  * unlink on negative dentries currently.
1066  */
1067 int cifs_unlink(struct inode *dir, struct dentry *dentry)
1068 {
1069         int rc = 0;
1070         unsigned int xid;
1071         char *full_path = NULL;
1072         struct inode *inode = dentry->d_inode;
1073         struct cifsInodeInfo *cifs_inode;
1074         struct super_block *sb = dir->i_sb;
1075         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
1076         struct tcon_link *tlink;
1077         struct cifs_tcon *tcon;
1078         struct TCP_Server_Info *server;
1079         struct iattr *attrs = NULL;
1080         __u32 dosattr = 0, origattr = 0;
1081
1082         cFYI(1, "cifs_unlink, dir=0x%p, dentry=0x%p", dir, dentry);
1083
1084         tlink = cifs_sb_tlink(cifs_sb);
1085         if (IS_ERR(tlink))
1086                 return PTR_ERR(tlink);
1087         tcon = tlink_tcon(tlink);
1088         server = tcon->ses->server;
1089
1090         xid = get_xid();
1091
1092         /* Unlink can be called from rename so we can not take the
1093          * sb->s_vfs_rename_mutex here */
1094         full_path = build_path_from_dentry(dentry);
1095         if (full_path == NULL) {
1096                 rc = -ENOMEM;
1097                 goto unlink_out;
1098         }
1099
1100         if (cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP &
1101                                 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
1102                 rc = CIFSPOSIXDelFile(xid, tcon, full_path,
1103                         SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls,
1104                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1105                 cFYI(1, "posix del rc %d", rc);
1106                 if ((rc == 0) || (rc == -ENOENT))
1107                         goto psx_del_no_retry;
1108         }
1109
1110 retry_std_delete:
1111         if (!server->ops->unlink) {
1112                 rc = -ENOSYS;
1113                 goto psx_del_no_retry;
1114         }
1115
1116         rc = server->ops->unlink(xid, tcon, full_path, cifs_sb);
1117
1118 psx_del_no_retry:
1119         if (!rc) {
1120                 if (inode)
1121                         cifs_drop_nlink(inode);
1122         } else if (rc == -ENOENT) {
1123                 d_drop(dentry);
1124         } else if (rc == -ETXTBSY) {
1125                 if (server->ops->rename_pending_delete) {
1126                         rc = server->ops->rename_pending_delete(full_path,
1127                                                                 dentry, xid);
1128                         if (rc == 0)
1129                                 cifs_drop_nlink(inode);
1130                 } else
1131                         rc = -ENOSYS;
1132         } else if ((rc == -EACCES) && (dosattr == 0) && inode) {
1133                 attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
1134                 if (attrs == NULL) {
1135                         rc = -ENOMEM;
1136                         goto out_reval;
1137                 }
1138
1139                 /* try to reset dos attributes */
1140                 cifs_inode = CIFS_I(inode);
1141                 origattr = cifs_inode->cifsAttrs;
1142                 if (origattr == 0)
1143                         origattr |= ATTR_NORMAL;
1144                 dosattr = origattr & ~ATTR_READONLY;
1145                 if (dosattr == 0)
1146                         dosattr |= ATTR_NORMAL;
1147                 dosattr |= ATTR_HIDDEN;
1148
1149                 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
1150                 if (rc != 0)
1151                         goto out_reval;
1152
1153                 goto retry_std_delete;
1154         }
1155
1156         /* undo the setattr if we errored out and it's needed */
1157         if (rc != 0 && dosattr != 0)
1158                 cifs_set_file_info(inode, attrs, xid, full_path, origattr);
1159
1160 out_reval:
1161         if (inode) {
1162                 cifs_inode = CIFS_I(inode);
1163                 cifs_inode->time = 0;   /* will force revalidate to get info
1164                                            when needed */
1165                 inode->i_ctime = current_fs_time(sb);
1166         }
1167         dir->i_ctime = dir->i_mtime = current_fs_time(sb);
1168         cifs_inode = CIFS_I(dir);
1169         CIFS_I(dir)->time = 0;  /* force revalidate of dir as well */
1170 unlink_out:
1171         kfree(full_path);
1172         kfree(attrs);
1173         free_xid(xid);
1174         cifs_put_tlink(tlink);
1175         return rc;
1176 }
1177
1178 static int
1179 cifs_mkdir_qinfo(struct inode *inode, struct dentry *dentry, umode_t mode,
1180                  const char *full_path, struct cifs_sb_info *cifs_sb,
1181                  struct cifs_tcon *tcon, const unsigned int xid)
1182 {
1183         int rc = 0;
1184         struct inode *newinode = NULL;
1185
1186         if (tcon->unix_ext)
1187                 rc = cifs_get_inode_info_unix(&newinode, full_path, inode->i_sb,
1188                                               xid);
1189         else
1190                 rc = cifs_get_inode_info(&newinode, full_path, NULL,
1191                                          inode->i_sb, xid, NULL);
1192         if (rc)
1193                 return rc;
1194
1195         d_instantiate(dentry, newinode);
1196         /*
1197          * setting nlink not necessary except in cases where we failed to get it
1198          * from the server or was set bogus
1199          */
1200         spin_lock(&dentry->d_inode->i_lock);
1201         if ((dentry->d_inode) && (dentry->d_inode->i_nlink < 2))
1202                 set_nlink(dentry->d_inode, 2);
1203         spin_unlock(&dentry->d_inode->i_lock);
1204         mode &= ~current_umask();
1205         /* must turn on setgid bit if parent dir has it */
1206         if (inode->i_mode & S_ISGID)
1207                 mode |= S_ISGID;
1208
1209         if (tcon->unix_ext) {
1210                 struct cifs_unix_set_info_args args = {
1211                         .mode   = mode,
1212                         .ctime  = NO_CHANGE_64,
1213                         .atime  = NO_CHANGE_64,
1214                         .mtime  = NO_CHANGE_64,
1215                         .device = 0,
1216                 };
1217                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1218                         args.uid = (__u64)current_fsuid();
1219                         if (inode->i_mode & S_ISGID)
1220                                 args.gid = (__u64)inode->i_gid;
1221                         else
1222                                 args.gid = (__u64)current_fsgid();
1223                 } else {
1224                         args.uid = NO_CHANGE_64;
1225                         args.gid = NO_CHANGE_64;
1226                 }
1227                 CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args,
1228                                        cifs_sb->local_nls,
1229                                        cifs_sb->mnt_cifs_flags &
1230                                        CIFS_MOUNT_MAP_SPECIAL_CHR);
1231         } else {
1232                 struct TCP_Server_Info *server = tcon->ses->server;
1233                 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
1234                     (mode & S_IWUGO) == 0 && server->ops->mkdir_setinfo)
1235                         server->ops->mkdir_setinfo(newinode, full_path, cifs_sb,
1236                                                    tcon, xid);
1237                 if (dentry->d_inode) {
1238                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
1239                                 dentry->d_inode->i_mode = (mode | S_IFDIR);
1240
1241                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1242                                 dentry->d_inode->i_uid = current_fsuid();
1243                                 if (inode->i_mode & S_ISGID)
1244                                         dentry->d_inode->i_gid = inode->i_gid;
1245                                 else
1246                                         dentry->d_inode->i_gid =
1247                                                                 current_fsgid();
1248                         }
1249                 }
1250         }
1251         return rc;
1252 }
1253
1254 static int
1255 cifs_posix_mkdir(struct inode *inode, struct dentry *dentry, umode_t mode,
1256                  const char *full_path, struct cifs_sb_info *cifs_sb,
1257                  struct cifs_tcon *tcon, const unsigned int xid)
1258 {
1259         int rc = 0;
1260         u32 oplock = 0;
1261         FILE_UNIX_BASIC_INFO *info = NULL;
1262         struct inode *newinode = NULL;
1263         struct cifs_fattr fattr;
1264
1265         info = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
1266         if (info == NULL) {
1267                 rc = -ENOMEM;
1268                 goto posix_mkdir_out;
1269         }
1270
1271         mode &= ~current_umask();
1272         rc = CIFSPOSIXCreate(xid, tcon, SMB_O_DIRECTORY | SMB_O_CREAT, mode,
1273                              NULL /* netfid */, info, &oplock, full_path,
1274                              cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1275                              CIFS_MOUNT_MAP_SPECIAL_CHR);
1276         if (rc == -EOPNOTSUPP)
1277                 goto posix_mkdir_out;
1278         else if (rc) {
1279                 cFYI(1, "posix mkdir returned 0x%x", rc);
1280                 d_drop(dentry);
1281                 goto posix_mkdir_out;
1282         }
1283
1284         if (info->Type == cpu_to_le32(-1))
1285                 /* no return info, go query for it */
1286                 goto posix_mkdir_get_info;
1287         /*
1288          * BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if
1289          * need to set uid/gid.
1290          */
1291
1292         cifs_unix_basic_to_fattr(&fattr, info, cifs_sb);
1293         cifs_fill_uniqueid(inode->i_sb, &fattr);
1294         newinode = cifs_iget(inode->i_sb, &fattr);
1295         if (!newinode)
1296                 goto posix_mkdir_get_info;
1297
1298         d_instantiate(dentry, newinode);
1299
1300 #ifdef CONFIG_CIFS_DEBUG2
1301         cFYI(1, "instantiated dentry %p %s to inode %p", dentry,
1302              dentry->d_name.name, newinode);
1303
1304         if (newinode->i_nlink != 2)
1305                 cFYI(1, "unexpected number of links %d", newinode->i_nlink);
1306 #endif
1307
1308 posix_mkdir_out:
1309         kfree(info);
1310         return rc;
1311 posix_mkdir_get_info:
1312         rc = cifs_mkdir_qinfo(inode, dentry, mode, full_path, cifs_sb, tcon,
1313                               xid);
1314         goto posix_mkdir_out;
1315 }
1316
1317 int cifs_mkdir(struct inode *inode, struct dentry *direntry, umode_t mode)
1318 {
1319         int rc = 0;
1320         unsigned int xid;
1321         struct cifs_sb_info *cifs_sb;
1322         struct tcon_link *tlink;
1323         struct cifs_tcon *tcon;
1324         struct TCP_Server_Info *server;
1325         char *full_path;
1326
1327         cFYI(1, "In cifs_mkdir, mode = 0x%hx inode = 0x%p", mode, inode);
1328
1329         cifs_sb = CIFS_SB(inode->i_sb);
1330         tlink = cifs_sb_tlink(cifs_sb);
1331         if (IS_ERR(tlink))
1332                 return PTR_ERR(tlink);
1333         tcon = tlink_tcon(tlink);
1334
1335         xid = get_xid();
1336
1337         full_path = build_path_from_dentry(direntry);
1338         if (full_path == NULL) {
1339                 rc = -ENOMEM;
1340                 goto mkdir_out;
1341         }
1342
1343         if (cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP &
1344                                 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
1345                 rc = cifs_posix_mkdir(inode, direntry, mode, full_path, cifs_sb,
1346                                       tcon, xid);
1347                 if (rc != -EOPNOTSUPP)
1348                         goto mkdir_out;
1349         }
1350
1351         server = tcon->ses->server;
1352
1353         if (!server->ops->mkdir) {
1354                 rc = -ENOSYS;
1355                 goto mkdir_out;
1356         }
1357
1358         /* BB add setting the equivalent of mode via CreateX w/ACLs */
1359         rc = server->ops->mkdir(xid, tcon, full_path, cifs_sb);
1360         if (rc) {
1361                 cFYI(1, "cifs_mkdir returned 0x%x", rc);
1362                 d_drop(direntry);
1363                 goto mkdir_out;
1364         }
1365
1366         rc = cifs_mkdir_qinfo(inode, direntry, mode, full_path, cifs_sb, tcon,
1367                               xid);
1368 mkdir_out:
1369         /*
1370          * Force revalidate to get parent dir info when needed since cached
1371          * attributes are invalid now.
1372          */
1373         CIFS_I(inode)->time = 0;
1374         kfree(full_path);
1375         free_xid(xid);
1376         cifs_put_tlink(tlink);
1377         return rc;
1378 }
1379
1380 int cifs_rmdir(struct inode *inode, struct dentry *direntry)
1381 {
1382         int rc = 0;
1383         unsigned int xid;
1384         struct cifs_sb_info *cifs_sb;
1385         struct tcon_link *tlink;
1386         struct cifs_tcon *tcon;
1387         struct TCP_Server_Info *server;
1388         char *full_path = NULL;
1389         struct cifsInodeInfo *cifsInode;
1390
1391         cFYI(1, "cifs_rmdir, inode = 0x%p", inode);
1392
1393         xid = get_xid();
1394
1395         full_path = build_path_from_dentry(direntry);
1396         if (full_path == NULL) {
1397                 rc = -ENOMEM;
1398                 goto rmdir_exit;
1399         }
1400
1401         cifs_sb = CIFS_SB(inode->i_sb);
1402         tlink = cifs_sb_tlink(cifs_sb);
1403         if (IS_ERR(tlink)) {
1404                 rc = PTR_ERR(tlink);
1405                 goto rmdir_exit;
1406         }
1407         tcon = tlink_tcon(tlink);
1408         server = tcon->ses->server;
1409
1410         if (!server->ops->rmdir) {
1411                 rc = -ENOSYS;
1412                 cifs_put_tlink(tlink);
1413                 goto rmdir_exit;
1414         }
1415
1416         rc = server->ops->rmdir(xid, tcon, full_path, cifs_sb);
1417         cifs_put_tlink(tlink);
1418
1419         if (!rc) {
1420                 spin_lock(&direntry->d_inode->i_lock);
1421                 i_size_write(direntry->d_inode, 0);
1422                 clear_nlink(direntry->d_inode);
1423                 spin_unlock(&direntry->d_inode->i_lock);
1424         }
1425
1426         cifsInode = CIFS_I(direntry->d_inode);
1427         /* force revalidate to go get info when needed */
1428         cifsInode->time = 0;
1429
1430         cifsInode = CIFS_I(inode);
1431         /*
1432          * Force revalidate to get parent dir info when needed since cached
1433          * attributes are invalid now.
1434          */
1435         cifsInode->time = 0;
1436
1437         direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
1438                 current_fs_time(inode->i_sb);
1439
1440 rmdir_exit:
1441         kfree(full_path);
1442         free_xid(xid);
1443         return rc;
1444 }
1445
1446 static int
1447 cifs_do_rename(const unsigned int xid, struct dentry *from_dentry,
1448                const char *from_path, struct dentry *to_dentry,
1449                const char *to_path)
1450 {
1451         struct cifs_sb_info *cifs_sb = CIFS_SB(from_dentry->d_sb);
1452         struct tcon_link *tlink;
1453         struct cifs_tcon *tcon;
1454         struct TCP_Server_Info *server;
1455         __u16 srcfid;
1456         int oplock, rc;
1457
1458         tlink = cifs_sb_tlink(cifs_sb);
1459         if (IS_ERR(tlink))
1460                 return PTR_ERR(tlink);
1461         tcon = tlink_tcon(tlink);
1462         server = tcon->ses->server;
1463
1464         if (!server->ops->rename)
1465                 return -ENOSYS;
1466
1467         /* try path-based rename first */
1468         rc = server->ops->rename(xid, tcon, from_path, to_path, cifs_sb);
1469
1470         /*
1471          * Don't bother with rename by filehandle unless file is busy and
1472          * source. Note that cross directory moves do not work with
1473          * rename by filehandle to various Windows servers.
1474          */
1475         if (rc == 0 || rc != -ETXTBSY)
1476                 goto do_rename_exit;
1477
1478         /* open-file renames don't work across directories */
1479         if (to_dentry->d_parent != from_dentry->d_parent)
1480                 goto do_rename_exit;
1481
1482         /* open the file to be renamed -- we need DELETE perms */
1483         rc = CIFSSMBOpen(xid, tcon, from_path, FILE_OPEN, DELETE,
1484                          CREATE_NOT_DIR, &srcfid, &oplock, NULL,
1485                          cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1486                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1487         if (rc == 0) {
1488                 rc = CIFSSMBRenameOpenFile(xid, tcon, srcfid,
1489                                 (const char *) to_dentry->d_name.name,
1490                                 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1491                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1492                 CIFSSMBClose(xid, tcon, srcfid);
1493         }
1494 do_rename_exit:
1495         cifs_put_tlink(tlink);
1496         return rc;
1497 }
1498
1499 int
1500 cifs_rename(struct inode *source_dir, struct dentry *source_dentry,
1501             struct inode *target_dir, struct dentry *target_dentry)
1502 {
1503         char *from_name = NULL;
1504         char *to_name = NULL;
1505         struct cifs_sb_info *cifs_sb;
1506         struct tcon_link *tlink;
1507         struct cifs_tcon *tcon;
1508         FILE_UNIX_BASIC_INFO *info_buf_source = NULL;
1509         FILE_UNIX_BASIC_INFO *info_buf_target;
1510         unsigned int xid;
1511         int rc, tmprc;
1512
1513         cifs_sb = CIFS_SB(source_dir->i_sb);
1514         tlink = cifs_sb_tlink(cifs_sb);
1515         if (IS_ERR(tlink))
1516                 return PTR_ERR(tlink);
1517         tcon = tlink_tcon(tlink);
1518
1519         xid = get_xid();
1520
1521         /*
1522          * we already have the rename sem so we do not need to
1523          * grab it again here to protect the path integrity
1524          */
1525         from_name = build_path_from_dentry(source_dentry);
1526         if (from_name == NULL) {
1527                 rc = -ENOMEM;
1528                 goto cifs_rename_exit;
1529         }
1530
1531         to_name = build_path_from_dentry(target_dentry);
1532         if (to_name == NULL) {
1533                 rc = -ENOMEM;
1534                 goto cifs_rename_exit;
1535         }
1536
1537         rc = cifs_do_rename(xid, source_dentry, from_name, target_dentry,
1538                             to_name);
1539
1540         if (rc == -EEXIST && tcon->unix_ext) {
1541                 /*
1542                  * Are src and dst hardlinks of same inode? We can only tell
1543                  * with unix extensions enabled.
1544                  */
1545                 info_buf_source =
1546                         kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO),
1547                                         GFP_KERNEL);
1548                 if (info_buf_source == NULL) {
1549                         rc = -ENOMEM;
1550                         goto cifs_rename_exit;
1551                 }
1552
1553                 info_buf_target = info_buf_source + 1;
1554                 tmprc = CIFSSMBUnixQPathInfo(xid, tcon, from_name,
1555                                              info_buf_source,
1556                                              cifs_sb->local_nls,
1557                                              cifs_sb->mnt_cifs_flags &
1558                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1559                 if (tmprc != 0)
1560                         goto unlink_target;
1561
1562                 tmprc = CIFSSMBUnixQPathInfo(xid, tcon, to_name,
1563                                              info_buf_target,
1564                                              cifs_sb->local_nls,
1565                                              cifs_sb->mnt_cifs_flags &
1566                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1567
1568                 if (tmprc == 0 && (info_buf_source->UniqueId ==
1569                                    info_buf_target->UniqueId)) {
1570                         /* same file, POSIX says that this is a noop */
1571                         rc = 0;
1572                         goto cifs_rename_exit;
1573                 }
1574         }
1575         /*
1576          * else ... BB we could add the same check for Windows by
1577          * checking the UniqueId via FILE_INTERNAL_INFO
1578          */
1579
1580 unlink_target:
1581         /* Try unlinking the target dentry if it's not negative */
1582         if (target_dentry->d_inode && (rc == -EACCES || rc == -EEXIST)) {
1583                 tmprc = cifs_unlink(target_dir, target_dentry);
1584                 if (tmprc)
1585                         goto cifs_rename_exit;
1586                 rc = cifs_do_rename(xid, source_dentry, from_name,
1587                                     target_dentry, to_name);
1588         }
1589
1590 cifs_rename_exit:
1591         kfree(info_buf_source);
1592         kfree(from_name);
1593         kfree(to_name);
1594         free_xid(xid);
1595         cifs_put_tlink(tlink);
1596         return rc;
1597 }
1598
1599 static bool
1600 cifs_inode_needs_reval(struct inode *inode)
1601 {
1602         struct cifsInodeInfo *cifs_i = CIFS_I(inode);
1603         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1604
1605         if (cifs_i->clientCanCacheRead)
1606                 return false;
1607
1608         if (!lookupCacheEnabled)
1609                 return true;
1610
1611         if (cifs_i->time == 0)
1612                 return true;
1613
1614         if (!time_in_range(jiffies, cifs_i->time,
1615                                 cifs_i->time + cifs_sb->actimeo))
1616                 return true;
1617
1618         /* hardlinked files w/ noserverino get "special" treatment */
1619         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) &&
1620             S_ISREG(inode->i_mode) && inode->i_nlink != 1)
1621                 return true;
1622
1623         return false;
1624 }
1625
1626 /*
1627  * Zap the cache. Called when invalid_mapping flag is set.
1628  */
1629 int
1630 cifs_invalidate_mapping(struct inode *inode)
1631 {
1632         int rc = 0;
1633         struct cifsInodeInfo *cifs_i = CIFS_I(inode);
1634
1635         cifs_i->invalid_mapping = false;
1636
1637         if (inode->i_mapping && inode->i_mapping->nrpages != 0) {
1638                 rc = invalidate_inode_pages2(inode->i_mapping);
1639                 if (rc) {
1640                         cERROR(1, "%s: could not invalidate inode %p", __func__,
1641                                inode);
1642                         cifs_i->invalid_mapping = true;
1643                 }
1644         }
1645
1646         cifs_fscache_reset_inode_cookie(inode);
1647         return rc;
1648 }
1649
1650 int cifs_revalidate_file_attr(struct file *filp)
1651 {
1652         int rc = 0;
1653         struct inode *inode = filp->f_path.dentry->d_inode;
1654         struct cifsFileInfo *cfile = (struct cifsFileInfo *) filp->private_data;
1655
1656         if (!cifs_inode_needs_reval(inode))
1657                 return rc;
1658
1659         if (tlink_tcon(cfile->tlink)->unix_ext)
1660                 rc = cifs_get_file_info_unix(filp);
1661         else
1662                 rc = cifs_get_file_info(filp);
1663
1664         return rc;
1665 }
1666
1667 int cifs_revalidate_dentry_attr(struct dentry *dentry)
1668 {
1669         unsigned int xid;
1670         int rc = 0;
1671         struct inode *inode = dentry->d_inode;
1672         struct super_block *sb = dentry->d_sb;
1673         char *full_path = NULL;
1674
1675         if (inode == NULL)
1676                 return -ENOENT;
1677
1678         if (!cifs_inode_needs_reval(inode))
1679                 return rc;
1680
1681         xid = get_xid();
1682
1683         /* can not safely grab the rename sem here if rename calls revalidate
1684            since that would deadlock */
1685         full_path = build_path_from_dentry(dentry);
1686         if (full_path == NULL) {
1687                 rc = -ENOMEM;
1688                 goto out;
1689         }
1690
1691         cFYI(1, "Update attributes: %s inode 0x%p count %d dentry: 0x%p d_time "
1692                  "%ld jiffies %ld", full_path, inode, inode->i_count.counter,
1693                  dentry, dentry->d_time, jiffies);
1694
1695         if (cifs_sb_master_tcon(CIFS_SB(sb))->unix_ext)
1696                 rc = cifs_get_inode_info_unix(&inode, full_path, sb, xid);
1697         else
1698                 rc = cifs_get_inode_info(&inode, full_path, NULL, sb,
1699                                          xid, NULL);
1700
1701 out:
1702         kfree(full_path);
1703         free_xid(xid);
1704         return rc;
1705 }
1706
1707 int cifs_revalidate_file(struct file *filp)
1708 {
1709         int rc;
1710         struct inode *inode = filp->f_path.dentry->d_inode;
1711
1712         rc = cifs_revalidate_file_attr(filp);
1713         if (rc)
1714                 return rc;
1715
1716         if (CIFS_I(inode)->invalid_mapping)
1717                 rc = cifs_invalidate_mapping(inode);
1718         return rc;
1719 }
1720
1721 /* revalidate a dentry's inode attributes */
1722 int cifs_revalidate_dentry(struct dentry *dentry)
1723 {
1724         int rc;
1725         struct inode *inode = dentry->d_inode;
1726
1727         rc = cifs_revalidate_dentry_attr(dentry);
1728         if (rc)
1729                 return rc;
1730
1731         if (CIFS_I(inode)->invalid_mapping)
1732                 rc = cifs_invalidate_mapping(inode);
1733         return rc;
1734 }
1735
1736 int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1737                  struct kstat *stat)
1738 {
1739         struct cifs_sb_info *cifs_sb = CIFS_SB(dentry->d_sb);
1740         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
1741         struct inode *inode = dentry->d_inode;
1742         int rc;
1743
1744         /*
1745          * We need to be sure that all dirty pages are written and the server
1746          * has actual ctime, mtime and file length.
1747          */
1748         if (!CIFS_I(inode)->clientCanCacheRead && inode->i_mapping &&
1749             inode->i_mapping->nrpages != 0) {
1750                 rc = filemap_fdatawait(inode->i_mapping);
1751                 if (rc) {
1752                         mapping_set_error(inode->i_mapping, rc);
1753                         return rc;
1754                 }
1755         }
1756
1757         rc = cifs_revalidate_dentry_attr(dentry);
1758         if (rc)
1759                 return rc;
1760
1761         generic_fillattr(inode, stat);
1762         stat->blksize = CIFS_MAX_MSGSIZE;
1763         stat->ino = CIFS_I(inode)->uniqueid;
1764
1765         /*
1766          * If on a multiuser mount without unix extensions, and the admin hasn't
1767          * overridden them, set the ownership to the fsuid/fsgid of the current
1768          * process.
1769          */
1770         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER) &&
1771             !tcon->unix_ext) {
1772                 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID))
1773                         stat->uid = current_fsuid();
1774                 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID))
1775                         stat->gid = current_fsgid();
1776         }
1777         return rc;
1778 }
1779
1780 static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1781 {
1782         pgoff_t index = from >> PAGE_CACHE_SHIFT;
1783         unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1784         struct page *page;
1785         int rc = 0;
1786
1787         page = grab_cache_page(mapping, index);
1788         if (!page)
1789                 return -ENOMEM;
1790
1791         zero_user_segment(page, offset, PAGE_CACHE_SIZE);
1792         unlock_page(page);
1793         page_cache_release(page);
1794         return rc;
1795 }
1796
1797 static void cifs_setsize(struct inode *inode, loff_t offset)
1798 {
1799         loff_t oldsize;
1800
1801         spin_lock(&inode->i_lock);
1802         oldsize = inode->i_size;
1803         i_size_write(inode, offset);
1804         spin_unlock(&inode->i_lock);
1805
1806         truncate_pagecache(inode, oldsize, offset);
1807 }
1808
1809 static int
1810 cifs_set_file_size(struct inode *inode, struct iattr *attrs,
1811                    unsigned int xid, char *full_path)
1812 {
1813         int rc;
1814         struct cifsFileInfo *open_file;
1815         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1816         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1817         struct tcon_link *tlink = NULL;
1818         struct cifs_tcon *tcon = NULL;
1819         struct TCP_Server_Info *server;
1820         struct cifs_io_parms io_parms;
1821
1822         /*
1823          * To avoid spurious oplock breaks from server, in the case of
1824          * inodes that we already have open, avoid doing path based
1825          * setting of file size if we can do it by handle.
1826          * This keeps our caching token (oplock) and avoids timeouts
1827          * when the local oplock break takes longer to flush
1828          * writebehind data than the SMB timeout for the SetPathInfo
1829          * request would allow
1830          */
1831         open_file = find_writable_file(cifsInode, true);
1832         if (open_file) {
1833                 tcon = tlink_tcon(open_file->tlink);
1834                 server = tcon->ses->server;
1835                 if (server->ops->set_file_size)
1836                         rc = server->ops->set_file_size(xid, tcon, open_file,
1837                                                         attrs->ia_size, false);
1838                 else
1839                         rc = -ENOSYS;
1840                 cifsFileInfo_put(open_file);
1841                 cFYI(1, "SetFSize for attrs rc = %d", rc);
1842                 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1843                         unsigned int bytes_written;
1844
1845                         io_parms.netfid = open_file->fid.netfid;
1846                         io_parms.pid = open_file->pid;
1847                         io_parms.tcon = tcon;
1848                         io_parms.offset = 0;
1849                         io_parms.length = attrs->ia_size;
1850                         rc = CIFSSMBWrite(xid, &io_parms, &bytes_written,
1851                                           NULL, NULL, 1);
1852                         cFYI(1, "Wrt seteof rc %d", rc);
1853                 }
1854         } else
1855                 rc = -EINVAL;
1856
1857         if (!rc)
1858                 goto set_size_out;
1859
1860         if (tcon == NULL) {
1861                 tlink = cifs_sb_tlink(cifs_sb);
1862                 if (IS_ERR(tlink))
1863                         return PTR_ERR(tlink);
1864                 tcon = tlink_tcon(tlink);
1865                 server = tcon->ses->server;
1866         }
1867
1868         /*
1869          * Set file size by pathname rather than by handle either because no
1870          * valid, writeable file handle for it was found or because there was
1871          * an error setting it by handle.
1872          */
1873         if (server->ops->set_path_size)
1874                 rc = server->ops->set_path_size(xid, tcon, full_path,
1875                                                 attrs->ia_size, cifs_sb, false);
1876         else
1877                 rc = -ENOSYS;
1878         cFYI(1, "SetEOF by path (setattrs) rc = %d", rc);
1879         if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1880                 __u16 netfid;
1881                 int oplock = 0;
1882
1883                 rc = SMBLegacyOpen(xid, tcon, full_path, FILE_OPEN,
1884                                    GENERIC_WRITE, CREATE_NOT_DIR, &netfid,
1885                                    &oplock, NULL, cifs_sb->local_nls,
1886                                    cifs_sb->mnt_cifs_flags &
1887                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1888                 if (rc == 0) {
1889                         unsigned int bytes_written;
1890
1891                         io_parms.netfid = netfid;
1892                         io_parms.pid = current->tgid;
1893                         io_parms.tcon = tcon;
1894                         io_parms.offset = 0;
1895                         io_parms.length = attrs->ia_size;
1896                         rc = CIFSSMBWrite(xid, &io_parms, &bytes_written, NULL,
1897                                           NULL,  1);
1898                         cFYI(1, "wrt seteof rc %d", rc);
1899                         CIFSSMBClose(xid, tcon, netfid);
1900                 }
1901         }
1902         if (tlink)
1903                 cifs_put_tlink(tlink);
1904
1905 set_size_out:
1906         if (rc == 0) {
1907                 cifsInode->server_eof = attrs->ia_size;
1908                 cifs_setsize(inode, attrs->ia_size);
1909                 cifs_truncate_page(inode->i_mapping, inode->i_size);
1910         }
1911
1912         return rc;
1913 }
1914
1915 static int
1916 cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
1917 {
1918         int rc;
1919         unsigned int xid;
1920         char *full_path = NULL;
1921         struct inode *inode = direntry->d_inode;
1922         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1923         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1924         struct tcon_link *tlink;
1925         struct cifs_tcon *pTcon;
1926         struct cifs_unix_set_info_args *args = NULL;
1927         struct cifsFileInfo *open_file;
1928
1929         cFYI(1, "setattr_unix on file %s attrs->ia_valid=0x%x",
1930                  direntry->d_name.name, attrs->ia_valid);
1931
1932         xid = get_xid();
1933
1934         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
1935                 attrs->ia_valid |= ATTR_FORCE;
1936
1937         rc = inode_change_ok(inode, attrs);
1938         if (rc < 0)
1939                 goto out;
1940
1941         full_path = build_path_from_dentry(direntry);
1942         if (full_path == NULL) {
1943                 rc = -ENOMEM;
1944                 goto out;
1945         }
1946
1947         /*
1948          * Attempt to flush data before changing attributes. We need to do
1949          * this for ATTR_SIZE and ATTR_MTIME for sure, and if we change the
1950          * ownership or mode then we may also need to do this. Here, we take
1951          * the safe way out and just do the flush on all setattr requests. If
1952          * the flush returns error, store it to report later and continue.
1953          *
1954          * BB: This should be smarter. Why bother flushing pages that
1955          * will be truncated anyway? Also, should we error out here if
1956          * the flush returns error?
1957          */
1958         rc = filemap_write_and_wait(inode->i_mapping);
1959         mapping_set_error(inode->i_mapping, rc);
1960         rc = 0;
1961
1962         if (attrs->ia_valid & ATTR_SIZE) {
1963                 rc = cifs_set_file_size(inode, attrs, xid, full_path);
1964                 if (rc != 0)
1965                         goto out;
1966         }
1967
1968         /* skip mode change if it's just for clearing setuid/setgid */
1969         if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
1970                 attrs->ia_valid &= ~ATTR_MODE;
1971
1972         args = kmalloc(sizeof(*args), GFP_KERNEL);
1973         if (args == NULL) {
1974                 rc = -ENOMEM;
1975                 goto out;
1976         }
1977
1978         /* set up the struct */
1979         if (attrs->ia_valid & ATTR_MODE)
1980                 args->mode = attrs->ia_mode;
1981         else
1982                 args->mode = NO_CHANGE_64;
1983
1984         if (attrs->ia_valid & ATTR_UID)
1985                 args->uid = attrs->ia_uid;
1986         else
1987                 args->uid = NO_CHANGE_64;
1988
1989         if (attrs->ia_valid & ATTR_GID)
1990                 args->gid = attrs->ia_gid;
1991         else
1992                 args->gid = NO_CHANGE_64;
1993
1994         if (attrs->ia_valid & ATTR_ATIME)
1995                 args->atime = cifs_UnixTimeToNT(attrs->ia_atime);
1996         else
1997                 args->atime = NO_CHANGE_64;
1998
1999         if (attrs->ia_valid & ATTR_MTIME)
2000                 args->mtime = cifs_UnixTimeToNT(attrs->ia_mtime);
2001         else
2002                 args->mtime = NO_CHANGE_64;
2003
2004         if (attrs->ia_valid & ATTR_CTIME)
2005                 args->ctime = cifs_UnixTimeToNT(attrs->ia_ctime);
2006         else
2007                 args->ctime = NO_CHANGE_64;
2008
2009         args->device = 0;
2010         open_file = find_writable_file(cifsInode, true);
2011         if (open_file) {
2012                 u16 nfid = open_file->fid.netfid;
2013                 u32 npid = open_file->pid;
2014                 pTcon = tlink_tcon(open_file->tlink);
2015                 rc = CIFSSMBUnixSetFileInfo(xid, pTcon, args, nfid, npid);
2016                 cifsFileInfo_put(open_file);
2017         } else {
2018                 tlink = cifs_sb_tlink(cifs_sb);
2019                 if (IS_ERR(tlink)) {
2020                         rc = PTR_ERR(tlink);
2021                         goto out;
2022                 }
2023                 pTcon = tlink_tcon(tlink);
2024                 rc = CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, args,
2025                                     cifs_sb->local_nls,
2026                                     cifs_sb->mnt_cifs_flags &
2027                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
2028                 cifs_put_tlink(tlink);
2029         }
2030
2031         if (rc)
2032                 goto out;
2033
2034         if ((attrs->ia_valid & ATTR_SIZE) &&
2035             attrs->ia_size != i_size_read(inode))
2036                 truncate_setsize(inode, attrs->ia_size);
2037
2038         setattr_copy(inode, attrs);
2039         mark_inode_dirty(inode);
2040
2041         /* force revalidate when any of these times are set since some
2042            of the fs types (eg ext3, fat) do not have fine enough
2043            time granularity to match protocol, and we do not have a
2044            a way (yet) to query the server fs's time granularity (and
2045            whether it rounds times down).
2046         */
2047         if (attrs->ia_valid & (ATTR_MTIME | ATTR_CTIME))
2048                 cifsInode->time = 0;
2049 out:
2050         kfree(args);
2051         kfree(full_path);
2052         free_xid(xid);
2053         return rc;
2054 }
2055
2056 static int
2057 cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
2058 {
2059         unsigned int xid;
2060         uid_t uid = NO_CHANGE_32;
2061         gid_t gid = NO_CHANGE_32;
2062         struct inode *inode = direntry->d_inode;
2063         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2064         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
2065         char *full_path = NULL;
2066         int rc = -EACCES;
2067         __u32 dosattr = 0;
2068         __u64 mode = NO_CHANGE_64;
2069
2070         xid = get_xid();
2071
2072         cFYI(1, "setattr on file %s attrs->iavalid 0x%x",
2073                  direntry->d_name.name, attrs->ia_valid);
2074
2075         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
2076                 attrs->ia_valid |= ATTR_FORCE;
2077
2078         rc = inode_change_ok(inode, attrs);
2079         if (rc < 0) {
2080                 free_xid(xid);
2081                 return rc;
2082         }
2083
2084         full_path = build_path_from_dentry(direntry);
2085         if (full_path == NULL) {
2086                 rc = -ENOMEM;
2087                 free_xid(xid);
2088                 return rc;
2089         }
2090
2091         /*
2092          * Attempt to flush data before changing attributes. We need to do
2093          * this for ATTR_SIZE and ATTR_MTIME for sure, and if we change the
2094          * ownership or mode then we may also need to do this. Here, we take
2095          * the safe way out and just do the flush on all setattr requests. If
2096          * the flush returns error, store it to report later and continue.
2097          *
2098          * BB: This should be smarter. Why bother flushing pages that
2099          * will be truncated anyway? Also, should we error out here if
2100          * the flush returns error?
2101          */
2102         rc = filemap_write_and_wait(inode->i_mapping);
2103         mapping_set_error(inode->i_mapping, rc);
2104         rc = 0;
2105
2106         if (attrs->ia_valid & ATTR_SIZE) {
2107                 rc = cifs_set_file_size(inode, attrs, xid, full_path);
2108                 if (rc != 0)
2109                         goto cifs_setattr_exit;
2110         }
2111
2112         if (attrs->ia_valid & ATTR_UID)
2113                 uid = attrs->ia_uid;
2114
2115         if (attrs->ia_valid & ATTR_GID)
2116                 gid = attrs->ia_gid;
2117
2118 #ifdef CONFIG_CIFS_ACL
2119         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
2120                 if (uid != NO_CHANGE_32 || gid != NO_CHANGE_32) {
2121                         rc = id_mode_to_cifs_acl(inode, full_path, NO_CHANGE_64,
2122                                                         uid, gid);
2123                         if (rc) {
2124                                 cFYI(1, "%s: Setting id failed with error: %d",
2125                                         __func__, rc);
2126                                 goto cifs_setattr_exit;
2127                         }
2128                 }
2129         } else
2130 #endif /* CONFIG_CIFS_ACL */
2131         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID))
2132                 attrs->ia_valid &= ~(ATTR_UID | ATTR_GID);
2133
2134         /* skip mode change if it's just for clearing setuid/setgid */
2135         if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
2136                 attrs->ia_valid &= ~ATTR_MODE;
2137
2138         if (attrs->ia_valid & ATTR_MODE) {
2139                 mode = attrs->ia_mode;
2140                 rc = 0;
2141 #ifdef CONFIG_CIFS_ACL
2142                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
2143                         rc = id_mode_to_cifs_acl(inode, full_path, mode,
2144                                                 NO_CHANGE_32, NO_CHANGE_32);
2145                         if (rc) {
2146                                 cFYI(1, "%s: Setting ACL failed with error: %d",
2147                                         __func__, rc);
2148                                 goto cifs_setattr_exit;
2149                         }
2150                 } else
2151 #endif /* CONFIG_CIFS_ACL */
2152                 if (((mode & S_IWUGO) == 0) &&
2153                     (cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
2154
2155                         dosattr = cifsInode->cifsAttrs | ATTR_READONLY;
2156
2157                         /* fix up mode if we're not using dynperm */
2158                         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
2159                                 attrs->ia_mode = inode->i_mode & ~S_IWUGO;
2160                 } else if ((mode & S_IWUGO) &&
2161                            (cifsInode->cifsAttrs & ATTR_READONLY)) {
2162
2163                         dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
2164                         /* Attributes of 0 are ignored */
2165                         if (dosattr == 0)
2166                                 dosattr |= ATTR_NORMAL;
2167
2168                         /* reset local inode permissions to normal */
2169                         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
2170                                 attrs->ia_mode &= ~(S_IALLUGO);
2171                                 if (S_ISDIR(inode->i_mode))
2172                                         attrs->ia_mode |=
2173                                                 cifs_sb->mnt_dir_mode;
2174                                 else
2175                                         attrs->ia_mode |=
2176                                                 cifs_sb->mnt_file_mode;
2177                         }
2178                 } else if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
2179                         /* ignore mode change - ATTR_READONLY hasn't changed */
2180                         attrs->ia_valid &= ~ATTR_MODE;
2181                 }
2182         }
2183
2184         if (attrs->ia_valid & (ATTR_MTIME|ATTR_ATIME|ATTR_CTIME) ||
2185             ((attrs->ia_valid & ATTR_MODE) && dosattr)) {
2186                 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
2187                 /* BB: check for rc = -EOPNOTSUPP and switch to legacy mode */
2188
2189                 /* Even if error on time set, no sense failing the call if
2190                 the server would set the time to a reasonable value anyway,
2191                 and this check ensures that we are not being called from
2192                 sys_utimes in which case we ought to fail the call back to
2193                 the user when the server rejects the call */
2194                 if ((rc) && (attrs->ia_valid &
2195                                 (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
2196                         rc = 0;
2197         }
2198
2199         /* do not need local check to inode_check_ok since the server does
2200            that */
2201         if (rc)
2202                 goto cifs_setattr_exit;
2203
2204         if ((attrs->ia_valid & ATTR_SIZE) &&
2205             attrs->ia_size != i_size_read(inode))
2206                 truncate_setsize(inode, attrs->ia_size);
2207
2208         setattr_copy(inode, attrs);
2209         mark_inode_dirty(inode);
2210
2211 cifs_setattr_exit:
2212         kfree(full_path);
2213         free_xid(xid);
2214         return rc;
2215 }
2216
2217 int
2218 cifs_setattr(struct dentry *direntry, struct iattr *attrs)
2219 {
2220         struct inode *inode = direntry->d_inode;
2221         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2222         struct cifs_tcon *pTcon = cifs_sb_master_tcon(cifs_sb);
2223
2224         if (pTcon->unix_ext)
2225                 return cifs_setattr_unix(direntry, attrs);
2226
2227         return cifs_setattr_nounix(direntry, attrs);
2228
2229         /* BB: add cifs_setattr_legacy for really old servers */
2230 }
2231
2232 #if 0
2233 void cifs_delete_inode(struct inode *inode)
2234 {
2235         cFYI(1, "In cifs_delete_inode, inode = 0x%p", inode);
2236         /* may have to add back in if and when safe distributed caching of
2237            directories added e.g. via FindNotify */
2238 }
2239 #endif