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         unsigned long oldtime = cifs_i->time;
 128
 129         cifs_revalidate_cache(inode, fattr);
 130
 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         cFYI(1, "inode 0x%p old_time=%ld new_time=%ld", inode,
 152                  oldtime, cifs_i->time);
 153
 154         cifs_i->delete_pending = fattr->cf_flags & CIFS_FATTR_DELETE_PENDING;
 155
 156         cifs_i->server_eof = fattr->cf_eof;
 157         /*
 158          * Can't safely change the file size here if the client is writing to
 159          * it due to potential races.
 160          */
 161         spin_lock(&inode->i_lock);
 162         if (is_size_safe_to_change(cifs_i, fattr->cf_eof)) {
 163                 i_size_write(inode, fattr->cf_eof);
 164
 165                 /*
 166                  * i_blocks is not related to (i_size / i_blksize),
 167                  * but instead 512 byte (2**9) size is required for
 168                  * calculating num blocks.
 169                  */
 170                 inode->i_blocks = (512 - 1 + fattr->cf_bytes) >> 9;
 171         }
 172         spin_unlock(&inode->i_lock);
 173
 174         if (fattr->cf_flags & CIFS_FATTR_DFS_REFERRAL)
 175                 inode->i_flags |= S_AUTOMOUNT;
 176         cifs_set_ops(inode);
 177 }
 178
 179 void
 180 cifs_fill_uniqueid(struct super_block *sb, struct cifs_fattr *fattr)
 181 {
 182         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 183
 184         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 185                 return;
 186
 187         fattr->cf_uniqueid = iunique(sb, ROOT_I);
 188 }
 189
 190 /* Fill a cifs_fattr struct with info from FILE_UNIX_BASIC_INFO. */
 191 void
 192 cifs_unix_basic_to_fattr(struct cifs_fattr *fattr, FILE_UNIX_BASIC_INFO *info,
 193                          struct cifs_sb_info *cifs_sb)
 194 {
 195         memset(fattr, 0, sizeof(*fattr));
 196         fattr->cf_uniqueid = le64_to_cpu(info->UniqueId);
 197         fattr->cf_bytes = le64_to_cpu(info->NumOfBytes);
 198         fattr->cf_eof = le64_to_cpu(info->EndOfFile);
 199
 200         fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
 201         fattr->cf_mtime = cifs_NTtimeToUnix(info->LastModificationTime);
 202         fattr->cf_ctime = cifs_NTtimeToUnix(info->LastStatusChange);
 203         fattr->cf_mode = le64_to_cpu(info->Permissions);
 204
 205         /*
 206          * Since we set the inode type below we need to mask off
 207          * to avoid strange results if bits set above.
 208          */
 209         fattr->cf_mode &= ~S_IFMT;
 210         switch (le32_to_cpu(info->Type)) {
 211         case UNIX_FILE:
 212                 fattr->cf_mode |= S_IFREG;
 213                 fattr->cf_dtype = DT_REG;
 214                 break;
 215         case UNIX_SYMLINK:
 216                 fattr->cf_mode |= S_IFLNK;
 217                 fattr->cf_dtype = DT_LNK;
 218                 break;
 219         case UNIX_DIR:
 220                 fattr->cf_mode |= S_IFDIR;
 221                 fattr->cf_dtype = DT_DIR;
 222                 break;
 223         case UNIX_CHARDEV:
 224                 fattr->cf_mode |= S_IFCHR;
 225                 fattr->cf_dtype = DT_CHR;
 226                 fattr->cf_rdev = MKDEV(le64_to_cpu(info->DevMajor),
 227                                        le64_to_cpu(info->DevMinor) & MINORMASK);
 228                 break;
 229         case UNIX_BLOCKDEV:
 230                 fattr->cf_mode |= S_IFBLK;
 231                 fattr->cf_dtype = DT_BLK;
 232                 fattr->cf_rdev = MKDEV(le64_to_cpu(info->DevMajor),
 233                                        le64_to_cpu(info->DevMinor) & MINORMASK);
 234                 break;
 235         case UNIX_FIFO:
 236                 fattr->cf_mode |= S_IFIFO;
 237                 fattr->cf_dtype = DT_FIFO;
 238                 break;
 239         case UNIX_SOCKET:
 240                 fattr->cf_mode |= S_IFSOCK;
 241                 fattr->cf_dtype = DT_SOCK;
 242                 break;
 243         default:
 244                 /* safest to call it a file if we do not know */
 245                 fattr->cf_mode |= S_IFREG;
 246                 fattr->cf_dtype = DT_REG;
 247                 cFYI(1, "unknown type %d", le32_to_cpu(info->Type));
 248                 break;
 249         }
 250
 251         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
 252                 fattr->cf_uid = cifs_sb->mnt_uid;
 253         else
 254                 fattr->cf_uid = le64_to_cpu(info->Uid);
 255
 256         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
 257                 fattr->cf_gid = cifs_sb->mnt_gid;
 258         else
 259                 fattr->cf_gid = le64_to_cpu(info->Gid);
 260
 261         fattr->cf_nlink = le64_to_cpu(info->Nlinks);
 262 }
 263
 264 /*
 265  * Fill a cifs_fattr struct with fake inode info.
 266  *
 267  * Needed to setup cifs_fattr data for the directory which is the
 268  * junction to the new submount (ie to setup the fake directory
 269  * which represents a DFS referral).
 270  */
 271 static void
 272 cifs_create_dfs_fattr(struct cifs_fattr *fattr, struct super_block *sb)
 273 {
 274         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 275
 276         cFYI(1, "creating fake fattr for DFS referral");
 277
 278         memset(fattr, 0, sizeof(*fattr));
 279         fattr->cf_mode = S_IFDIR | S_IXUGO | S_IRWXU;
 280         fattr->cf_uid = cifs_sb->mnt_uid;
 281         fattr->cf_gid = cifs_sb->mnt_gid;
 282         fattr->cf_atime = CURRENT_TIME;
 283         fattr->cf_ctime = CURRENT_TIME;
 284         fattr->cf_mtime = CURRENT_TIME;
 285         fattr->cf_nlink = 2;
 286         fattr->cf_flags |= CIFS_FATTR_DFS_REFERRAL;
 287 }
 288
 289 int cifs_get_file_info_unix(struct file *filp)
 290 {
 291         int rc;
 292         unsigned int xid;
 293         FILE_UNIX_BASIC_INFO find_data;
 294         struct cifs_fattr fattr;
 295         struct inode *inode = filp->f_path.dentry->d_inode;
 296         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 297         struct cifsFileInfo *cfile = filp->private_data;
 298         struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
 299
 300         xid = get_xid();
 301         rc = CIFSSMBUnixQFileInfo(xid, tcon, cfile->netfid, &find_data);
 302         if (!rc) {
 303                 cifs_unix_basic_to_fattr(&fattr, &find_data, cifs_sb);
 304         } else if (rc == -EREMOTE) {
 305                 cifs_create_dfs_fattr(&fattr, inode->i_sb);
 306                 rc = 0;
 307         }
 308
 309         cifs_fattr_to_inode(inode, &fattr);
 310         free_xid(xid);
 311         return rc;
 312 }
 313
 314 int cifs_get_inode_info_unix(struct inode **pinode,
 315                              const unsigned char *full_path,
 316                              struct super_block *sb, unsigned int xid)
 317 {
 318         int rc;
 319         FILE_UNIX_BASIC_INFO find_data;
 320         struct cifs_fattr fattr;
 321         struct cifs_tcon *tcon;
 322         struct tcon_link *tlink;
 323         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 324
 325         cFYI(1, "Getting info on %s", full_path);
 326
 327         tlink = cifs_sb_tlink(cifs_sb);
 328         if (IS_ERR(tlink))
 329                 return PTR_ERR(tlink);
 330         tcon = tlink_tcon(tlink);
 331
 332         /* could have done a find first instead but this returns more info */
 333         rc = CIFSSMBUnixQPathInfo(xid, tcon, full_path, &find_data,
 334                                   cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
 335                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 336         cifs_put_tlink(tlink);
 337
 338         if (!rc) {
 339                 cifs_unix_basic_to_fattr(&fattr, &find_data, cifs_sb);
 340         } else if (rc == -EREMOTE) {
 341                 cifs_create_dfs_fattr(&fattr, sb);
 342                 rc = 0;
 343         } else {
 344                 return rc;
 345         }
 346
 347         /* check for Minshall+French symlinks */
 348         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
 349                 int tmprc = CIFSCheckMFSymlink(&fattr, full_path, cifs_sb, xid);
 350                 if (tmprc)
 351                         cFYI(1, "CIFSCheckMFSymlink: %d", tmprc);
 352         }
 353
 354         if (*pinode == NULL) {
 355                 /* get new inode */
 356                 cifs_fill_uniqueid(sb, &fattr);
 357                 *pinode = cifs_iget(sb, &fattr);
 358                 if (!*pinode)
 359                         rc = -ENOMEM;
 360         } else {
 361                 /* we already have inode, update it */
 362                 cifs_fattr_to_inode(*pinode, &fattr);
 363         }
 364
 365         return rc;
 366 }
 367
 368 static int
 369 cifs_sfu_type(struct cifs_fattr *fattr, const unsigned char *path,
 370               struct cifs_sb_info *cifs_sb, unsigned int xid)
 371 {
 372         int rc;
 373         int oplock = 0;
 374         __u16 netfid;
 375         struct tcon_link *tlink;
 376         struct cifs_tcon *tcon;
 377         struct cifs_io_parms io_parms;
 378         char buf[24];
 379         unsigned int bytes_read;
 380         char *pbuf;
 381
 382         pbuf = buf;
 383
 384         fattr->cf_mode &= ~S_IFMT;
 385
 386         if (fattr->cf_eof == 0) {
 387                 fattr->cf_mode |= S_IFIFO;
 388                 fattr->cf_dtype = DT_FIFO;
 389                 return 0;
 390         } else if (fattr->cf_eof < 8) {
 391                 fattr->cf_mode |= S_IFREG;
 392                 fattr->cf_dtype = DT_REG;
 393                 return -EINVAL;  /* EOPNOTSUPP? */
 394         }
 395
 396         tlink = cifs_sb_tlink(cifs_sb);
 397         if (IS_ERR(tlink))
 398                 return PTR_ERR(tlink);
 399         tcon = tlink_tcon(tlink);
 400
 401         rc = CIFSSMBOpen(xid, tcon, path, FILE_OPEN, GENERIC_READ,
 402                          CREATE_NOT_DIR, &netfid, &oplock, NULL,
 403                          cifs_sb->local_nls,
 404                          cifs_sb->mnt_cifs_flags &
 405                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 406         if (rc == 0) {
 407                 int buf_type = CIFS_NO_BUFFER;
 408                         /* Read header */
 409                 io_parms.netfid = netfid;
 410                 io_parms.pid = current->tgid;
 411                 io_parms.tcon = tcon;
 412                 io_parms.offset = 0;
 413                 io_parms.length = 24;
 414                 rc = CIFSSMBRead(xid, &io_parms, &bytes_read, &pbuf,
 415                                  &buf_type);
 416                 if ((rc == 0) && (bytes_read >= 8)) {
 417                         if (memcmp("IntxBLK", pbuf, 8) == 0) {
 418                                 cFYI(1, "Block device");
 419                                 fattr->cf_mode |= S_IFBLK;
 420                                 fattr->cf_dtype = DT_BLK;
 421                                 if (bytes_read == 24) {
 422                                         /* we have enough to decode dev num */
 423                                         __u64 mjr; /* major */
 424                                         __u64 mnr; /* minor */
 425                                         mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
 426                                         mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
 427                                         fattr->cf_rdev = MKDEV(mjr, mnr);
 428                                 }
 429                         } else if (memcmp("IntxCHR", pbuf, 8) == 0) {
 430                                 cFYI(1, "Char device");
 431                                 fattr->cf_mode |= S_IFCHR;
 432                                 fattr->cf_dtype = DT_CHR;
 433                                 if (bytes_read == 24) {
 434                                         /* we have enough to decode dev num */
 435                                         __u64 mjr; /* major */
 436                                         __u64 mnr; /* minor */
 437                                         mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
 438                                         mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
 439                                         fattr->cf_rdev = MKDEV(mjr, mnr);
 440                                 }
 441                         } else if (memcmp("IntxLNK", pbuf, 7) == 0) {
 442                                 cFYI(1, "Symlink");
 443                                 fattr->cf_mode |= S_IFLNK;
 444                                 fattr->cf_dtype = DT_LNK;
 445                         } else {
 446                                 fattr->cf_mode |= S_IFREG; /* file? */
 447                                 fattr->cf_dtype = DT_REG;
 448                                 rc = -EOPNOTSUPP;
 449                         }
 450                 } else {
 451                         fattr->cf_mode |= S_IFREG; /* then it is a file */
 452                         fattr->cf_dtype = DT_REG;
 453                         rc = -EOPNOTSUPP; /* or some unknown SFU type */
 454                 }
 455                 CIFSSMBClose(xid, tcon, netfid);
 456         }
 457         cifs_put_tlink(tlink);
 458         return rc;
 459 }
 460
 461 #define SFBITS_MASK (S_ISVTX | S_ISGID | S_ISUID)  /* SETFILEBITS valid bits */
 462
 463 /*
 464  * Fetch mode bits as provided by SFU.
 465  *
 466  * FIXME: Doesn't this clobber the type bit we got from cifs_sfu_type ?
 467  */
 468 static int cifs_sfu_mode(struct cifs_fattr *fattr, const unsigned char *path,
 469                          struct cifs_sb_info *cifs_sb, unsigned int xid)
 470 {
 471 #ifdef CONFIG_CIFS_XATTR
 472         ssize_t rc;
 473         char ea_value[4];
 474         __u32 mode;
 475         struct tcon_link *tlink;
 476         struct cifs_tcon *tcon;
 477
 478         tlink = cifs_sb_tlink(cifs_sb);
 479         if (IS_ERR(tlink))
 480                 return PTR_ERR(tlink);
 481         tcon = tlink_tcon(tlink);
 482
 483         rc = CIFSSMBQAllEAs(xid, tcon, path, "SETFILEBITS",
 484                             ea_value, 4 /* size of buf */, cifs_sb->local_nls,
 485                             cifs_sb->mnt_cifs_flags &
 486                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 487         cifs_put_tlink(tlink);
 488         if (rc < 0)
 489                 return (int)rc;
 490         else if (rc > 3) {
 491                 mode = le32_to_cpu(*((__le32 *)ea_value));
 492                 fattr->cf_mode &= ~SFBITS_MASK;
 493                 cFYI(1, "special bits 0%o org mode 0%o", mode,
 494                          fattr->cf_mode);
 495                 fattr->cf_mode = (mode & SFBITS_MASK) | fattr->cf_mode;
 496                 cFYI(1, "special mode bits 0%o", mode);
 497         }
 498
 499         return 0;
 500 #else
 501         return -EOPNOTSUPP;
 502 #endif
 503 }
 504
 505 /* Fill a cifs_fattr struct with info from FILE_ALL_INFO */
 506 static void
 507 cifs_all_info_to_fattr(struct cifs_fattr *fattr, FILE_ALL_INFO *info,
 508                        struct cifs_sb_info *cifs_sb, bool adjust_tz)
 509 {
 510         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
 511
 512         memset(fattr, 0, sizeof(*fattr));
 513         fattr->cf_cifsattrs = le32_to_cpu(info->Attributes);
 514         if (info->DeletePending)
 515                 fattr->cf_flags |= CIFS_FATTR_DELETE_PENDING;
 516
 517         if (info->LastAccessTime)
 518                 fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
 519         else
 520                 fattr->cf_atime = CURRENT_TIME;
 521
 522         fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime);
 523         fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
 524
 525         if (adjust_tz) {
 526                 fattr->cf_ctime.tv_sec += tcon->ses->server->timeAdj;
 527                 fattr->cf_mtime.tv_sec += tcon->ses->server->timeAdj;
 528         }
 529
 530         fattr->cf_eof = le64_to_cpu(info->EndOfFile);
 531         fattr->cf_bytes = le64_to_cpu(info->AllocationSize);
 532         fattr->cf_createtime = le64_to_cpu(info->CreationTime);
 533
 534         if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
 535                 fattr->cf_mode = S_IFDIR | cifs_sb->mnt_dir_mode;
 536                 fattr->cf_dtype = DT_DIR;
 537                 /*
 538                  * Server can return wrong NumberOfLinks value for directories
 539                  * when Unix extensions are disabled - fake it.
 540                  */
 541                 fattr->cf_nlink = 2;
 542         } else {
 543                 fattr->cf_mode = S_IFREG | cifs_sb->mnt_file_mode;
 544                 fattr->cf_dtype = DT_REG;
 545
 546                 /* clear write bits if ATTR_READONLY is set */
 547                 if (fattr->cf_cifsattrs & ATTR_READONLY)
 548                         fattr->cf_mode &= ~(S_IWUGO);
 549
 550                 fattr->cf_nlink = le32_to_cpu(info->NumberOfLinks);
 551         }
 552
 553         fattr->cf_uid = cifs_sb->mnt_uid;
 554         fattr->cf_gid = cifs_sb->mnt_gid;
 555 }
 556
 557 int cifs_get_file_info(struct file *filp)
 558 {
 559         int rc;
 560         unsigned int xid;
 561         FILE_ALL_INFO find_data;
 562         struct cifs_fattr fattr;
 563         struct inode *inode = filp->f_path.dentry->d_inode;
 564         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 565         struct cifsFileInfo *cfile = filp->private_data;
 566         struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
 567
 568         xid = get_xid();
 569         rc = CIFSSMBQFileInfo(xid, tcon, cfile->netfid, &find_data);
 570         switch (rc) {
 571         case 0:
 572                 cifs_all_info_to_fattr(&fattr, &find_data, cifs_sb, false);
 573                 break;
 574         case -EREMOTE:
 575                 cifs_create_dfs_fattr(&fattr, inode->i_sb);
 576                 rc = 0;
 577                 break;
 578         case -EOPNOTSUPP:
 579         case -EINVAL:
 580                 /*
 581                  * FIXME: legacy server -- fall back to path-based call?
 582                  * for now, just skip revalidating and mark inode for
 583                  * immediate reval.
 584                  */
 585                 rc = 0;
 586                 CIFS_I(inode)->time = 0;
 587         default:
 588                 goto cgfi_exit;
 589         }
 590
 591         /*
 592          * don't bother with SFU junk here -- just mark inode as needing
 593          * revalidation.
 594          */
 595         fattr.cf_uniqueid = CIFS_I(inode)->uniqueid;
 596         fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
 597         cifs_fattr_to_inode(inode, &fattr);
 598 cgfi_exit:
 599         free_xid(xid);
 600         return rc;
 601 }
 602
 603 int
 604 cifs_get_inode_info(struct inode **inode, const char *full_path,
 605                     FILE_ALL_INFO *data, struct super_block *sb, int xid,
 606                     const __u16 *fid)
 607 {
 608         int rc = 0, tmprc;
 609         struct cifs_tcon *tcon;
 610         struct TCP_Server_Info *server;
 611         struct tcon_link *tlink;
 612         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 613         char *buf = NULL;
 614         bool adjust_tz = false;
 615         struct cifs_fattr fattr;
 616
 617         tlink = cifs_sb_tlink(cifs_sb);
 618         if (IS_ERR(tlink))
 619                 return PTR_ERR(tlink);
 620         tcon = tlink_tcon(tlink);
 621         server = tcon->ses->server;
 622
 623         cFYI(1, "Getting info on %s", full_path);
 624
 625         if ((data == NULL) && (*inode != NULL)) {
 626                 if (CIFS_I(*inode)->clientCanCacheRead) {
 627                         cFYI(1, "No need to revalidate cached inode sizes");
 628                         goto cgii_exit;
 629                 }
 630         }
 631
 632         /* if inode info is not passed, get it from server */
 633         if (data == NULL) {
 634                 if (!server->ops->query_path_info) {
 635                         rc = -ENOSYS;
 636                         goto cgii_exit;
 637                 }
 638                 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
 639                 if (buf == NULL) {
 640                         rc = -ENOMEM;
 641                         goto cgii_exit;
 642                 }
 643                 data = (FILE_ALL_INFO *)buf;
 644                 rc = server->ops->query_path_info(xid, tcon, cifs_sb, full_path,
 645                                                   data, &adjust_tz);
 646         }
 647
 648         if (!rc) {
 649                 cifs_all_info_to_fattr(&fattr, (FILE_ALL_INFO *)data, cifs_sb,
 650                                        adjust_tz);
 651         } else if (rc == -EREMOTE) {
 652                 cifs_create_dfs_fattr(&fattr, sb);
 653                 rc = 0;
 654         } else {
 655                 goto cgii_exit;
 656         }
 657
 658         /*
 659          * If an inode wasn't passed in, then get the inode number
 660          *
 661          * Is an i_ino of zero legal? Can we use that to check if the server
 662          * supports returning inode numbers?  Are there other sanity checks we
 663          * can use to ensure that the server is really filling in that field?
 664          */
 665         if (*inode == NULL) {
 666                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 667                         if (server->ops->get_srv_inum)
 668                                 tmprc = server->ops->get_srv_inum(xid, tcon,
 669                                         cifs_sb, full_path, &fattr.cf_uniqueid,
 670                                         data);
 671                         else
 672                                 tmprc = -ENOSYS;
 673                         if (tmprc || !fattr.cf_uniqueid) {
 674                                 cFYI(1, "GetSrvInodeNum rc %d", tmprc);
 675                                 fattr.cf_uniqueid = iunique(sb, ROOT_I);
 676                                 cifs_autodisable_serverino(cifs_sb);
 677                         }
 678                 } else {
 679                         fattr.cf_uniqueid = iunique(sb, ROOT_I);
 680                 }
 681         } else {
 682                 fattr.cf_uniqueid = CIFS_I(*inode)->uniqueid;
 683         }
 684
 685         /* query for SFU type info if supported and needed */
 686         if (fattr.cf_cifsattrs & ATTR_SYSTEM &&
 687             cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
 688                 tmprc = cifs_sfu_type(&fattr, full_path, cifs_sb, xid);
 689                 if (tmprc)
 690                         cFYI(1, "cifs_sfu_type failed: %d", tmprc);
 691         }
 692
 693 #ifdef CONFIG_CIFS_ACL
 694         /* fill in 0777 bits from ACL */
 695         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
 696                 rc = cifs_acl_to_fattr(cifs_sb, &fattr, *inode, full_path, fid);
 697                 if (rc) {
 698                         cFYI(1, "%s: Getting ACL failed with error: %d",
 699                                 __func__, rc);
 700                         goto cgii_exit;
 701                 }
 702         }
 703 #endif /* CONFIG_CIFS_ACL */
 704
 705         /* fill in remaining high mode bits e.g. SUID, VTX */
 706         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
 707                 cifs_sfu_mode(&fattr, full_path, cifs_sb, xid);
 708
 709         /* check for Minshall+French symlinks */
 710         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
 711                 tmprc = CIFSCheckMFSymlink(&fattr, full_path, cifs_sb, xid);
 712                 if (tmprc)
 713                         cFYI(1, "CIFSCheckMFSymlink: %d", tmprc);
 714         }
 715
 716         if (!*inode) {
 717                 *inode = cifs_iget(sb, &fattr);
 718                 if (!*inode)
 719                         rc = -ENOMEM;
 720         } else {
 721                 cifs_fattr_to_inode(*inode, &fattr);
 722         }
 723
 724 cgii_exit:
 725         kfree(buf);
 726         cifs_put_tlink(tlink);
 727         return rc;
 728 }
 729
 730 static const struct inode_operations cifs_ipc_inode_ops = {
 731         .lookup = cifs_lookup,
 732 };
 733
 734 static int
 735 cifs_find_inode(struct inode *inode, void *opaque)
 736 {
 737         struct cifs_fattr *fattr = (struct cifs_fattr *) opaque;
 738
 739         /* don't match inode with different uniqueid */
 740         if (CIFS_I(inode)->uniqueid != fattr->cf_uniqueid)
 741                 return 0;
 742
 743         /* use createtime like an i_generation field */
 744         if (CIFS_I(inode)->createtime != fattr->cf_createtime)
 745                 return 0;
 746
 747         /* don't match inode of different type */
 748         if ((inode->i_mode & S_IFMT) != (fattr->cf_mode & S_IFMT))
 749                 return 0;
 750
 751         /* if it's not a directory or has no dentries, then flag it */
 752         if (S_ISDIR(inode->i_mode) && !hlist_empty(&inode->i_dentry))
 753                 fattr->cf_flags |= CIFS_FATTR_INO_COLLISION;
 754
 755         return 1;
 756 }
 757
 758 static int
 759 cifs_init_inode(struct inode *inode, void *opaque)
 760 {
 761         struct cifs_fattr *fattr = (struct cifs_fattr *) opaque;
 762
 763         CIFS_I(inode)->uniqueid = fattr->cf_uniqueid;
 764         CIFS_I(inode)->createtime = fattr->cf_createtime;
 765         return 0;
 766 }
 767
 768 /*
 769  * walk dentry list for an inode and report whether it has aliases that
 770  * are hashed. We use this to determine if a directory inode can actually
 771  * be used.
 772  */
 773 static bool
 774 inode_has_hashed_dentries(struct inode *inode)
 775 {
 776         struct dentry *dentry;
 777         struct hlist_node *p;
 778
 779         spin_lock(&inode->i_lock);
 780         hlist_for_each_entry(dentry, p, &inode->i_dentry, d_alias) {
 781                 if (!d_unhashed(dentry) || IS_ROOT(dentry)) {
 782                         spin_unlock(&inode->i_lock);
 783                         return true;
 784                 }
 785         }
 786         spin_unlock(&inode->i_lock);
 787         return false;
 788 }
 789
 790 /* Given fattrs, get a corresponding inode */
 791 struct inode *
 792 cifs_iget(struct super_block *sb, struct cifs_fattr *fattr)
 793 {
 794         unsigned long hash;
 795         struct inode *inode;
 796
 797 retry_iget5_locked:
 798         cFYI(1, "looking for uniqueid=%llu", fattr->cf_uniqueid);
 799
 800         /* hash down to 32-bits on 32-bit arch */
 801         hash = cifs_uniqueid_to_ino_t(fattr->cf_uniqueid);
 802
 803         inode = iget5_locked(sb, hash, cifs_find_inode, cifs_init_inode, fattr);
 804         if (inode) {
 805                 /* was there a potentially problematic inode collision? */
 806                 if (fattr->cf_flags & CIFS_FATTR_INO_COLLISION) {
 807                         fattr->cf_flags &= ~CIFS_FATTR_INO_COLLISION;
 808
 809                         if (inode_has_hashed_dentries(inode)) {
 810                                 cifs_autodisable_serverino(CIFS_SB(sb));
 811                                 iput(inode);
 812                                 fattr->cf_uniqueid = iunique(sb, ROOT_I);
 813                                 goto retry_iget5_locked;
 814                         }
 815                 }
 816
 817                 cifs_fattr_to_inode(inode, fattr);
 818                 if (sb->s_flags & MS_NOATIME)
 819                         inode->i_flags |= S_NOATIME | S_NOCMTIME;
 820                 if (inode->i_state & I_NEW) {
 821                         inode->i_ino = hash;
 822                         if (S_ISREG(inode->i_mode))
 823                                 inode->i_data.backing_dev_info = sb->s_bdi;
 824 #ifdef CONFIG_CIFS_FSCACHE
 825                         /* initialize per-inode cache cookie pointer */
 826                         CIFS_I(inode)->fscache = NULL;
 827 #endif
 828                         unlock_new_inode(inode);
 829                 }
 830         }
 831
 832         return inode;
 833 }
 834
 835 /* gets root inode */
 836 struct inode *cifs_root_iget(struct super_block *sb)
 837 {
 838         unsigned int xid;
 839         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 840         struct inode *inode = NULL;
 841         long rc;
 842         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
 843
 844         xid = get_xid();
 845         if (tcon->unix_ext)
 846                 rc = cifs_get_inode_info_unix(&inode, "", sb, xid);
 847         else
 848                 rc = cifs_get_inode_info(&inode, "", NULL, sb, xid, NULL);
 849
 850         if (!inode) {
 851                 inode = ERR_PTR(rc);
 852                 goto out;
 853         }
 854
 855 #ifdef CONFIG_CIFS_FSCACHE
 856         /* populate tcon->resource_id */
 857         tcon->resource_id = CIFS_I(inode)->uniqueid;
 858 #endif
 859
 860         if (rc && tcon->ipc) {
 861                 cFYI(1, "ipc connection - fake read inode");
 862                 inode->i_mode |= S_IFDIR;
 863                 set_nlink(inode, 2);
 864                 inode->i_op = &cifs_ipc_inode_ops;
 865                 inode->i_fop = &simple_dir_operations;
 866                 inode->i_uid = cifs_sb->mnt_uid;
 867                 inode->i_gid = cifs_sb->mnt_gid;
 868         } else if (rc) {
 869                 iget_failed(inode);
 870                 inode = ERR_PTR(rc);
 871         }
 872
 873 out:
 874         /* can not call macro free_xid here since in a void func
 875          * TODO: This is no longer true
 876          */
 877         _free_xid(xid);
 878         return inode;
 879 }
 880
 881 static int
 882 cifs_set_file_info(struct inode *inode, struct iattr *attrs, unsigned int xid,
 883                     char *full_path, __u32 dosattr)
 884 {
 885         int rc;
 886         int oplock = 0;
 887         __u16 netfid;
 888         __u32 netpid;
 889         bool set_time = false;
 890         struct cifsFileInfo *open_file;
 891         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
 892         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 893         struct tcon_link *tlink = NULL;
 894         struct cifs_tcon *pTcon;
 895         FILE_BASIC_INFO info_buf;
 896
 897         if (attrs == NULL)
 898                 return -EINVAL;
 899
 900         if (attrs->ia_valid & ATTR_ATIME) {
 901                 set_time = true;
 902                 info_buf.LastAccessTime =
 903                         cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
 904         } else
 905                 info_buf.LastAccessTime = 0;
 906
 907         if (attrs->ia_valid & ATTR_MTIME) {
 908                 set_time = true;
 909                 info_buf.LastWriteTime =
 910                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
 911         } else
 912                 info_buf.LastWriteTime = 0;
 913
 914         /*
 915          * Samba throws this field away, but windows may actually use it.
 916          * Do not set ctime unless other time stamps are changed explicitly
 917          * (i.e. by utimes()) since we would then have a mix of client and
 918          * server times.
 919          */
 920         if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
 921                 cFYI(1, "CIFS - CTIME changed");
 922                 info_buf.ChangeTime =
 923                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
 924         } else
 925                 info_buf.ChangeTime = 0;
 926
 927         info_buf.CreationTime = 0;      /* don't change */
 928         info_buf.Attributes = cpu_to_le32(dosattr);
 929
 930         /*
 931          * If the file is already open for write, just use that fileid
 932          */
 933         open_file = find_writable_file(cifsInode, true);
 934         if (open_file) {
 935                 netfid = open_file->netfid;
 936                 netpid = open_file->pid;
 937                 pTcon = tlink_tcon(open_file->tlink);
 938                 goto set_via_filehandle;
 939         }
 940
 941         tlink = cifs_sb_tlink(cifs_sb);
 942         if (IS_ERR(tlink)) {
 943                 rc = PTR_ERR(tlink);
 944                 tlink = NULL;
 945                 goto out;
 946         }
 947         pTcon = tlink_tcon(tlink);
 948
 949         /*
 950          * NT4 apparently returns success on this call, but it doesn't
 951          * really work.
 952          */
 953         if (!(pTcon->ses->flags & CIFS_SES_NT4)) {
 954                 rc = CIFSSMBSetPathInfo(xid, pTcon, full_path,
 955                                      &info_buf, cifs_sb->local_nls,
 956                                      cifs_sb->mnt_cifs_flags &
 957                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 958                 if (rc == 0) {
 959                         cifsInode->cifsAttrs = dosattr;
 960                         goto out;
 961                 } else if (rc != -EOPNOTSUPP && rc != -EINVAL)
 962                         goto out;
 963         }
 964
 965         cFYI(1, "calling SetFileInfo since SetPathInfo for "
 966                  "times not supported by this server");
 967         rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
 968                          SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
 969                          CREATE_NOT_DIR, &netfid, &oplock,
 970                          NULL, cifs_sb->local_nls,
 971                          cifs_sb->mnt_cifs_flags &
 972                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 973
 974         if (rc != 0) {
 975                 if (rc == -EIO)
 976                         rc = -EINVAL;
 977                 goto out;
 978         }
 979
 980         netpid = current->tgid;
 981
 982 set_via_filehandle:
 983         rc = CIFSSMBSetFileInfo(xid, pTcon, &info_buf, netfid, netpid);
 984         if (!rc)
 985                 cifsInode->cifsAttrs = dosattr;
 986
 987         if (open_file == NULL)
 988                 CIFSSMBClose(xid, pTcon, netfid);
 989         else
 990                 cifsFileInfo_put(open_file);
 991 out:
 992         if (tlink != NULL)
 993                 cifs_put_tlink(tlink);
 994         return rc;
 995 }
 996
 997 /*
 998  * open the given file (if it isn't already), set the DELETE_ON_CLOSE bit
 999  * and rename it to a random name that hopefully won't conflict with
1000  * anything else.
1001  */
1002 static int
1003 cifs_rename_pending_delete(char *full_path, struct dentry *dentry,
1004                            unsigned int xid)
1005 {
1006         int oplock = 0;
1007         int rc;
1008         __u16 netfid;
1009         struct inode *inode = dentry->d_inode;
1010         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1011         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1012         struct tcon_link *tlink;
1013         struct cifs_tcon *tcon;
1014         __u32 dosattr, origattr;
1015         FILE_BASIC_INFO *info_buf = NULL;
1016
1017         tlink = cifs_sb_tlink(cifs_sb);
1018         if (IS_ERR(tlink))
1019                 return PTR_ERR(tlink);
1020         tcon = tlink_tcon(tlink);
1021
1022         rc = CIFSSMBOpen(xid, tcon, full_path, FILE_OPEN,
1023                          DELETE|FILE_WRITE_ATTRIBUTES, CREATE_NOT_DIR,
1024                          &netfid, &oplock, NULL, cifs_sb->local_nls,
1025                          cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1026         if (rc != 0)
1027                 goto out;
1028
1029         origattr = cifsInode->cifsAttrs;
1030         if (origattr == 0)
1031                 origattr |= ATTR_NORMAL;
1032
1033         dosattr = origattr & ~ATTR_READONLY;
1034         if (dosattr == 0)
1035                 dosattr |= ATTR_NORMAL;
1036         dosattr |= ATTR_HIDDEN;
1037
1038         /* set ATTR_HIDDEN and clear ATTR_READONLY, but only if needed */
1039         if (dosattr != origattr) {
1040                 info_buf = kzalloc(sizeof(*info_buf), GFP_KERNEL);
1041                 if (info_buf == NULL) {
1042                         rc = -ENOMEM;
1043                         goto out_close;
1044                 }
1045                 info_buf->Attributes = cpu_to_le32(dosattr);
1046                 rc = CIFSSMBSetFileInfo(xid, tcon, info_buf, netfid,
1047                                         current->tgid);
1048                 /* although we would like to mark the file hidden
1049                    if that fails we will still try to rename it */
1050                 if (rc != 0)
1051                         cifsInode->cifsAttrs = dosattr;
1052                 else
1053                         dosattr = origattr; /* since not able to change them */
1054         }
1055
1056         /* rename the file */
1057         rc = CIFSSMBRenameOpenFile(xid, tcon, netfid, NULL, cifs_sb->local_nls,
1058                                    cifs_sb->mnt_cifs_flags &
1059                                             CIFS_MOUNT_MAP_SPECIAL_CHR);
1060         if (rc != 0) {
1061                 rc = -ETXTBSY;
1062                 goto undo_setattr;
1063         }
1064
1065         /* try to set DELETE_ON_CLOSE */
1066         if (!cifsInode->delete_pending) {
1067                 rc = CIFSSMBSetFileDisposition(xid, tcon, true, netfid,
1068                                                current->tgid);
1069                 /*
1070                  * some samba versions return -ENOENT when we try to set the
1071                  * file disposition here. Likely a samba bug, but work around
1072                  * it for now. This means that some cifsXXX files may hang
1073                  * around after they shouldn't.
1074                  *
1075                  * BB: remove this hack after more servers have the fix
1076                  */
1077                 if (rc == -ENOENT)
1078                         rc = 0;
1079                 else if (rc != 0) {
1080                         rc = -ETXTBSY;
1081                         goto undo_rename;
1082                 }
1083                 cifsInode->delete_pending = true;
1084         }
1085
1086 out_close:
1087         CIFSSMBClose(xid, tcon, netfid);
1088 out:
1089         kfree(info_buf);
1090         cifs_put_tlink(tlink);
1091         return rc;
1092
1093         /*
1094          * reset everything back to the original state. Don't bother
1095          * dealing with errors here since we can't do anything about
1096          * them anyway.
1097          */
1098 undo_rename:
1099         CIFSSMBRenameOpenFile(xid, tcon, netfid, dentry->d_name.name,
1100                                 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1101                                             CIFS_MOUNT_MAP_SPECIAL_CHR);
1102 undo_setattr:
1103         if (dosattr != origattr) {
1104                 info_buf->Attributes = cpu_to_le32(origattr);
1105                 if (!CIFSSMBSetFileInfo(xid, tcon, info_buf, netfid,
1106                                         current->tgid))
1107                         cifsInode->cifsAttrs = origattr;
1108         }
1109
1110         goto out_close;
1111 }
1112
1113
1114 /*
1115  * If dentry->d_inode is null (usually meaning the cached dentry
1116  * is a negative dentry) then we would attempt a standard SMB delete, but
1117  * if that fails we can not attempt the fall back mechanisms on EACCESS
1118  * but will return the EACCESS to the caller. Note that the VFS does not call
1119  * unlink on negative dentries currently.
1120  */
1121 int cifs_unlink(struct inode *dir, struct dentry *dentry)
1122 {
1123         int rc = 0;
1124         unsigned int xid;
1125         char *full_path = NULL;
1126         struct inode *inode = dentry->d_inode;
1127         struct cifsInodeInfo *cifs_inode;
1128         struct super_block *sb = dir->i_sb;
1129         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
1130         struct tcon_link *tlink;
1131         struct cifs_tcon *tcon;
1132         struct iattr *attrs = NULL;
1133         __u32 dosattr = 0, origattr = 0;
1134
1135         cFYI(1, "cifs_unlink, dir=0x%p, dentry=0x%p", dir, dentry);
1136
1137         tlink = cifs_sb_tlink(cifs_sb);
1138         if (IS_ERR(tlink))
1139                 return PTR_ERR(tlink);
1140         tcon = tlink_tcon(tlink);
1141
1142         xid = get_xid();
1143
1144         /* Unlink can be called from rename so we can not take the
1145          * sb->s_vfs_rename_mutex here */
1146         full_path = build_path_from_dentry(dentry);
1147         if (full_path == NULL) {
1148                 rc = -ENOMEM;
1149                 goto unlink_out;
1150         }
1151
1152         if ((tcon->ses->capabilities & CAP_UNIX) &&
1153                 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
1154                         le64_to_cpu(tcon->fsUnixInfo.Capability))) {
1155                 rc = CIFSPOSIXDelFile(xid, tcon, full_path,
1156                         SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls,
1157                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1158                 cFYI(1, "posix del rc %d", rc);
1159                 if ((rc == 0) || (rc == -ENOENT))
1160                         goto psx_del_no_retry;
1161         }
1162
1163 retry_std_delete:
1164         rc = CIFSSMBDelFile(xid, tcon, full_path, cifs_sb->local_nls,
1165                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1166
1167 psx_del_no_retry:
1168         if (!rc) {
1169                 if (inode)
1170                         drop_nlink(inode);
1171         } else if (rc == -ENOENT) {
1172                 d_drop(dentry);
1173         } else if (rc == -ETXTBSY) {
1174                 rc = cifs_rename_pending_delete(full_path, dentry, xid);
1175                 if (rc == 0)
1176                         drop_nlink(inode);
1177         } else if ((rc == -EACCES) && (dosattr == 0) && inode) {
1178                 attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
1179                 if (attrs == NULL) {
1180                         rc = -ENOMEM;
1181                         goto out_reval;
1182                 }
1183
1184                 /* try to reset dos attributes */
1185                 cifs_inode = CIFS_I(inode);
1186                 origattr = cifs_inode->cifsAttrs;
1187                 if (origattr == 0)
1188                         origattr |= ATTR_NORMAL;
1189                 dosattr = origattr & ~ATTR_READONLY;
1190                 if (dosattr == 0)
1191                         dosattr |= ATTR_NORMAL;
1192                 dosattr |= ATTR_HIDDEN;
1193
1194                 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
1195                 if (rc != 0)
1196                         goto out_reval;
1197
1198                 goto retry_std_delete;
1199         }
1200
1201         /* undo the setattr if we errored out and it's needed */
1202         if (rc != 0 && dosattr != 0)
1203                 cifs_set_file_info(inode, attrs, xid, full_path, origattr);
1204
1205 out_reval:
1206         if (inode) {
1207                 cifs_inode = CIFS_I(inode);
1208                 cifs_inode->time = 0;   /* will force revalidate to get info
1209                                            when needed */
1210                 inode->i_ctime = current_fs_time(sb);
1211         }
1212         dir->i_ctime = dir->i_mtime = current_fs_time(sb);
1213         cifs_inode = CIFS_I(dir);
1214         CIFS_I(dir)->time = 0;  /* force revalidate of dir as well */
1215 unlink_out:
1216         kfree(full_path);
1217         kfree(attrs);
1218         free_xid(xid);
1219         cifs_put_tlink(tlink);
1220         return rc;
1221 }
1222
1223 int cifs_mkdir(struct inode *inode, struct dentry *direntry, umode_t mode)
1224 {
1225         int rc = 0, tmprc;
1226         unsigned int xid;
1227         struct cifs_sb_info *cifs_sb;
1228         struct tcon_link *tlink;
1229         struct cifs_tcon *pTcon;
1230         char *full_path = NULL;
1231         struct inode *newinode = NULL;
1232         struct cifs_fattr fattr;
1233
1234         cFYI(1, "In cifs_mkdir, mode = 0x%hx inode = 0x%p", mode, inode);
1235
1236         cifs_sb = CIFS_SB(inode->i_sb);
1237         tlink = cifs_sb_tlink(cifs_sb);
1238         if (IS_ERR(tlink))
1239                 return PTR_ERR(tlink);
1240         pTcon = tlink_tcon(tlink);
1241
1242         xid = get_xid();
1243
1244         full_path = build_path_from_dentry(direntry);
1245         if (full_path == NULL) {
1246                 rc = -ENOMEM;
1247                 goto mkdir_out;
1248         }
1249
1250         if ((pTcon->ses->capabilities & CAP_UNIX) &&
1251                 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
1252                         le64_to_cpu(pTcon->fsUnixInfo.Capability))) {
1253                 u32 oplock = 0;
1254                 FILE_UNIX_BASIC_INFO *pInfo =
1255                         kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
1256                 if (pInfo == NULL) {
1257                         rc = -ENOMEM;
1258                         goto mkdir_out;
1259                 }
1260
1261                 mode &= ~current_umask();
1262                 rc = CIFSPOSIXCreate(xid, pTcon, SMB_O_DIRECTORY | SMB_O_CREAT,
1263                                 mode, NULL /* netfid */, pInfo, &oplock,
1264                                 full_path, cifs_sb->local_nls,
1265                                 cifs_sb->mnt_cifs_flags &
1266                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1267                 if (rc == -EOPNOTSUPP) {
1268                         kfree(pInfo);
1269                         goto mkdir_retry_old;
1270                 } else if (rc) {
1271                         cFYI(1, "posix mkdir returned 0x%x", rc);
1272                         d_drop(direntry);
1273                 } else {
1274                         if (pInfo->Type == cpu_to_le32(-1)) {
1275                                 /* no return info, go query for it */
1276                                 kfree(pInfo);
1277                                 goto mkdir_get_info;
1278                         }
1279 /*BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if need
1280         to set uid/gid */
1281
1282                         cifs_unix_basic_to_fattr(&fattr, pInfo, cifs_sb);
1283                         cifs_fill_uniqueid(inode->i_sb, &fattr);
1284                         newinode = cifs_iget(inode->i_sb, &fattr);
1285                         if (!newinode) {
1286                                 kfree(pInfo);
1287                                 goto mkdir_get_info;
1288                         }
1289
1290                         d_instantiate(direntry, newinode);
1291
1292 #ifdef CONFIG_CIFS_DEBUG2
1293                         cFYI(1, "instantiated dentry %p %s to inode %p",
1294                                 direntry, direntry->d_name.name, newinode);
1295
1296                         if (newinode->i_nlink != 2)
1297                                 cFYI(1, "unexpected number of links %d",
1298                                         newinode->i_nlink);
1299 #endif
1300                 }
1301                 kfree(pInfo);
1302                 goto mkdir_out;
1303         }
1304 mkdir_retry_old:
1305         /* BB add setting the equivalent of mode via CreateX w/ACLs */
1306         rc = CIFSSMBMkDir(xid, pTcon, full_path, cifs_sb->local_nls,
1307                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1308         if (rc) {
1309                 cFYI(1, "cifs_mkdir returned 0x%x", rc);
1310                 d_drop(direntry);
1311         } else {
1312 mkdir_get_info:
1313                 if (pTcon->unix_ext)
1314                         rc = cifs_get_inode_info_unix(&newinode, full_path,
1315                                                       inode->i_sb, xid);
1316                 else
1317                         rc = cifs_get_inode_info(&newinode, full_path, NULL,
1318                                                  inode->i_sb, xid, NULL);
1319
1320                 d_instantiate(direntry, newinode);
1321                  /* setting nlink not necessary except in cases where we
1322                   * failed to get it from the server or was set bogus */
1323                 if ((direntry->d_inode) && (direntry->d_inode->i_nlink < 2))
1324                         set_nlink(direntry->d_inode, 2);
1325
1326                 mode &= ~current_umask();
1327                 /* must turn on setgid bit if parent dir has it */
1328                 if (inode->i_mode & S_ISGID)
1329                         mode |= S_ISGID;
1330
1331                 if (pTcon->unix_ext) {
1332                         struct cifs_unix_set_info_args args = {
1333                                 .mode   = mode,
1334                                 .ctime  = NO_CHANGE_64,
1335                                 .atime  = NO_CHANGE_64,
1336                                 .mtime  = NO_CHANGE_64,
1337                                 .device = 0,
1338                         };
1339                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1340                                 args.uid = (__u64)current_fsuid();
1341                                 if (inode->i_mode & S_ISGID)
1342                                         args.gid = (__u64)inode->i_gid;
1343                                 else
1344                                         args.gid = (__u64)current_fsgid();
1345                         } else {
1346                                 args.uid = NO_CHANGE_64;
1347                                 args.gid = NO_CHANGE_64;
1348                         }
1349                         CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, &args,
1350                                                cifs_sb->local_nls,
1351                                                cifs_sb->mnt_cifs_flags &
1352                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1353                 } else {
1354                         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
1355                             (mode & S_IWUGO) == 0) {
1356                                 FILE_BASIC_INFO pInfo;
1357                                 struct cifsInodeInfo *cifsInode;
1358                                 u32 dosattrs;
1359
1360                                 memset(&pInfo, 0, sizeof(pInfo));
1361                                 cifsInode = CIFS_I(newinode);
1362                                 dosattrs = cifsInode->cifsAttrs|ATTR_READONLY;
1363                                 pInfo.Attributes = cpu_to_le32(dosattrs);
1364                                 tmprc = CIFSSMBSetPathInfo(xid, pTcon,
1365                                                 full_path, &pInfo,
1366                                                 cifs_sb->local_nls,
1367                                                 cifs_sb->mnt_cifs_flags &
1368                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1369                                 if (tmprc == 0)
1370                                         cifsInode->cifsAttrs = dosattrs;
1371                         }
1372                         if (direntry->d_inode) {
1373                                 if (cifs_sb->mnt_cifs_flags &
1374                                      CIFS_MOUNT_DYNPERM)
1375                                         direntry->d_inode->i_mode =
1376                                                 (mode | S_IFDIR);
1377
1378                                 if (cifs_sb->mnt_cifs_flags &
1379                                      CIFS_MOUNT_SET_UID) {
1380                                         direntry->d_inode->i_uid =
1381                                                 current_fsuid();
1382                                         if (inode->i_mode & S_ISGID)
1383                                                 direntry->d_inode->i_gid =
1384                                                         inode->i_gid;
1385                                         else
1386                                                 direntry->d_inode->i_gid =
1387                                                         current_fsgid();
1388                                 }
1389                         }
1390                 }
1391         }
1392 mkdir_out:
1393         /*
1394          * Force revalidate to get parent dir info when needed since cached
1395          * attributes are invalid now.
1396          */
1397         CIFS_I(inode)->time = 0;
1398         kfree(full_path);
1399         free_xid(xid);
1400         cifs_put_tlink(tlink);
1401         return rc;
1402 }
1403
1404 int cifs_rmdir(struct inode *inode, struct dentry *direntry)
1405 {
1406         int rc = 0;
1407         unsigned int xid;
1408         struct cifs_sb_info *cifs_sb;
1409         struct tcon_link *tlink;
1410         struct cifs_tcon *pTcon;
1411         char *full_path = NULL;
1412         struct cifsInodeInfo *cifsInode;
1413
1414         cFYI(1, "cifs_rmdir, inode = 0x%p", inode);
1415
1416         xid = get_xid();
1417
1418         full_path = build_path_from_dentry(direntry);
1419         if (full_path == NULL) {
1420                 rc = -ENOMEM;
1421                 goto rmdir_exit;
1422         }
1423
1424         cifs_sb = CIFS_SB(inode->i_sb);
1425         tlink = cifs_sb_tlink(cifs_sb);
1426         if (IS_ERR(tlink)) {
1427                 rc = PTR_ERR(tlink);
1428                 goto rmdir_exit;
1429         }
1430         pTcon = tlink_tcon(tlink);
1431
1432         rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls,
1433                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1434         cifs_put_tlink(tlink);
1435
1436         if (!rc) {
1437                 spin_lock(&direntry->d_inode->i_lock);
1438                 i_size_write(direntry->d_inode, 0);
1439                 clear_nlink(direntry->d_inode);
1440                 spin_unlock(&direntry->d_inode->i_lock);
1441         }
1442
1443         cifsInode = CIFS_I(direntry->d_inode);
1444         /* force revalidate to go get info when needed */
1445         cifsInode->time = 0;
1446
1447         cifsInode = CIFS_I(inode);
1448         /*
1449          * Force revalidate to get parent dir info when needed since cached
1450          * attributes are invalid now.
1451          */
1452         cifsInode->time = 0;
1453
1454         direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
1455                 current_fs_time(inode->i_sb);
1456
1457 rmdir_exit:
1458         kfree(full_path);
1459         free_xid(xid);
1460         return rc;
1461 }
1462
1463 static int
1464 cifs_do_rename(unsigned int xid, struct dentry *from_dentry,
1465                const char *fromPath, struct dentry *to_dentry,
1466                const char *toPath)
1467 {
1468         struct cifs_sb_info *cifs_sb = CIFS_SB(from_dentry->d_sb);
1469         struct tcon_link *tlink;
1470         struct cifs_tcon *pTcon;
1471         __u16 srcfid;
1472         int oplock, rc;
1473
1474         tlink = cifs_sb_tlink(cifs_sb);
1475         if (IS_ERR(tlink))
1476                 return PTR_ERR(tlink);
1477         pTcon = tlink_tcon(tlink);
1478
1479         /* try path-based rename first */
1480         rc = CIFSSMBRename(xid, pTcon, fromPath, toPath, cifs_sb->local_nls,
1481                            cifs_sb->mnt_cifs_flags &
1482                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1483
1484         /*
1485          * don't bother with rename by filehandle unless file is busy and
1486          * source Note that cross directory moves do not work with
1487          * rename by filehandle to various Windows servers.
1488          */
1489         if (rc == 0 || rc != -ETXTBSY)
1490                 goto do_rename_exit;
1491
1492         /* open-file renames don't work across directories */
1493         if (to_dentry->d_parent != from_dentry->d_parent)
1494                 goto do_rename_exit;
1495
1496         /* open the file to be renamed -- we need DELETE perms */
1497         rc = CIFSSMBOpen(xid, pTcon, fromPath, FILE_OPEN, DELETE,
1498                          CREATE_NOT_DIR, &srcfid, &oplock, NULL,
1499                          cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1500                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1501
1502         if (rc == 0) {
1503                 rc = CIFSSMBRenameOpenFile(xid, pTcon, srcfid,
1504                                 (const char *) to_dentry->d_name.name,
1505                                 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1506                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1507
1508                 CIFSSMBClose(xid, pTcon, srcfid);
1509         }
1510 do_rename_exit:
1511         cifs_put_tlink(tlink);
1512         return rc;
1513 }
1514
1515 int cifs_rename(struct inode *source_dir, struct dentry *source_dentry,
1516         struct inode *target_dir, struct dentry *target_dentry)
1517 {
1518         char *fromName = NULL;
1519         char *toName = NULL;
1520         struct cifs_sb_info *cifs_sb;
1521         struct tcon_link *tlink;
1522         struct cifs_tcon *tcon;
1523         FILE_UNIX_BASIC_INFO *info_buf_source = NULL;
1524         FILE_UNIX_BASIC_INFO *info_buf_target;
1525         unsigned int xid;
1526         int rc, tmprc;
1527
1528         cifs_sb = CIFS_SB(source_dir->i_sb);
1529         tlink = cifs_sb_tlink(cifs_sb);
1530         if (IS_ERR(tlink))
1531                 return PTR_ERR(tlink);
1532         tcon = tlink_tcon(tlink);
1533
1534         xid = get_xid();
1535
1536         /*
1537          * we already have the rename sem so we do not need to
1538          * grab it again here to protect the path integrity
1539          */
1540         fromName = build_path_from_dentry(source_dentry);
1541         if (fromName == NULL) {
1542                 rc = -ENOMEM;
1543                 goto cifs_rename_exit;
1544         }
1545
1546         toName = build_path_from_dentry(target_dentry);
1547         if (toName == NULL) {
1548                 rc = -ENOMEM;
1549                 goto cifs_rename_exit;
1550         }
1551
1552         rc = cifs_do_rename(xid, source_dentry, fromName,
1553                             target_dentry, toName);
1554
1555         if (rc == -EEXIST && tcon->unix_ext) {
1556                 /*
1557                  * Are src and dst hardlinks of same inode? We can
1558                  * only tell with unix extensions enabled
1559                  */
1560                 info_buf_source =
1561                         kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO),
1562                                         GFP_KERNEL);
1563                 if (info_buf_source == NULL) {
1564                         rc = -ENOMEM;
1565                         goto cifs_rename_exit;
1566                 }
1567
1568                 info_buf_target = info_buf_source + 1;
1569                 tmprc = CIFSSMBUnixQPathInfo(xid, tcon, fromName,
1570                                         info_buf_source,
1571                                         cifs_sb->local_nls,
1572                                         cifs_sb->mnt_cifs_flags &
1573                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1574                 if (tmprc != 0)
1575                         goto unlink_target;
1576
1577                 tmprc = CIFSSMBUnixQPathInfo(xid, tcon, toName,
1578                                         info_buf_target,
1579                                         cifs_sb->local_nls,
1580                                         cifs_sb->mnt_cifs_flags &
1581                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1582
1583                 if (tmprc == 0 && (info_buf_source->UniqueId ==
1584                                    info_buf_target->UniqueId)) {
1585                         /* same file, POSIX says that this is a noop */
1586                         rc = 0;
1587                         goto cifs_rename_exit;
1588                 }
1589         } /* else ... BB we could add the same check for Windows by
1590                      checking the UniqueId via FILE_INTERNAL_INFO */
1591
1592 unlink_target:
1593         /* Try unlinking the target dentry if it's not negative */
1594         if (target_dentry->d_inode && (rc == -EACCES || rc == -EEXIST)) {
1595                 tmprc = cifs_unlink(target_dir, target_dentry);
1596                 if (tmprc)
1597                         goto cifs_rename_exit;
1598
1599                 rc = cifs_do_rename(xid, source_dentry, fromName,
1600                                     target_dentry, toName);
1601         }
1602
1603 cifs_rename_exit:
1604         kfree(info_buf_source);
1605         kfree(fromName);
1606         kfree(toName);
1607         free_xid(xid);
1608         cifs_put_tlink(tlink);
1609         return rc;
1610 }
1611
1612 static bool
1613 cifs_inode_needs_reval(struct inode *inode)
1614 {
1615         struct cifsInodeInfo *cifs_i = CIFS_I(inode);
1616         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1617
1618         if (cifs_i->clientCanCacheRead)
1619                 return false;
1620
1621         if (!lookupCacheEnabled)
1622                 return true;
1623
1624         if (cifs_i->time == 0)
1625                 return true;
1626
1627         if (!time_in_range(jiffies, cifs_i->time,
1628                                 cifs_i->time + cifs_sb->actimeo))
1629                 return true;
1630
1631         /* hardlinked files w/ noserverino get "special" treatment */
1632         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) &&
1633             S_ISREG(inode->i_mode) && inode->i_nlink != 1)
1634                 return true;
1635
1636         return false;
1637 }
1638
1639 /*
1640  * Zap the cache. Called when invalid_mapping flag is set.
1641  */
1642 int
1643 cifs_invalidate_mapping(struct inode *inode)
1644 {
1645         int rc = 0;
1646         struct cifsInodeInfo *cifs_i = CIFS_I(inode);
1647
1648         cifs_i->invalid_mapping = false;
1649
1650         if (inode->i_mapping && inode->i_mapping->nrpages != 0) {
1651                 rc = invalidate_inode_pages2(inode->i_mapping);
1652                 if (rc) {
1653                         cERROR(1, "%s: could not invalidate inode %p", __func__,
1654                                inode);
1655                         cifs_i->invalid_mapping = true;
1656                 }
1657         }
1658
1659         cifs_fscache_reset_inode_cookie(inode);
1660         return rc;
1661 }
1662
1663 int cifs_revalidate_file_attr(struct file *filp)
1664 {
1665         int rc = 0;
1666         struct inode *inode = filp->f_path.dentry->d_inode;
1667         struct cifsFileInfo *cfile = (struct cifsFileInfo *) filp->private_data;
1668
1669         if (!cifs_inode_needs_reval(inode))
1670                 return rc;
1671
1672         if (tlink_tcon(cfile->tlink)->unix_ext)
1673                 rc = cifs_get_file_info_unix(filp);
1674         else
1675                 rc = cifs_get_file_info(filp);
1676
1677         return rc;
1678 }
1679
1680 int cifs_revalidate_dentry_attr(struct dentry *dentry)
1681 {
1682         unsigned int xid;
1683         int rc = 0;
1684         struct inode *inode = dentry->d_inode;
1685         struct super_block *sb = dentry->d_sb;
1686         char *full_path = NULL;
1687
1688         if (inode == NULL)
1689                 return -ENOENT;
1690
1691         if (!cifs_inode_needs_reval(inode))
1692                 return rc;
1693
1694         xid = get_xid();
1695
1696         /* can not safely grab the rename sem here if rename calls revalidate
1697            since that would deadlock */
1698         full_path = build_path_from_dentry(dentry);
1699         if (full_path == NULL) {
1700                 rc = -ENOMEM;
1701                 goto out;
1702         }
1703
1704         cFYI(1, "Update attributes: %s inode 0x%p count %d dentry: 0x%p d_time "
1705                  "%ld jiffies %ld", full_path, inode, inode->i_count.counter,
1706                  dentry, dentry->d_time, jiffies);
1707
1708         if (cifs_sb_master_tcon(CIFS_SB(sb))->unix_ext)
1709                 rc = cifs_get_inode_info_unix(&inode, full_path, sb, xid);
1710         else
1711                 rc = cifs_get_inode_info(&inode, full_path, NULL, sb,
1712                                          xid, NULL);
1713
1714 out:
1715         kfree(full_path);
1716         free_xid(xid);
1717         return rc;
1718 }
1719
1720 int cifs_revalidate_file(struct file *filp)
1721 {
1722         int rc;
1723         struct inode *inode = filp->f_path.dentry->d_inode;
1724
1725         rc = cifs_revalidate_file_attr(filp);
1726         if (rc)
1727                 return rc;
1728
1729         if (CIFS_I(inode)->invalid_mapping)
1730                 rc = cifs_invalidate_mapping(inode);
1731         return rc;
1732 }
1733
1734 /* revalidate a dentry's inode attributes */
1735 int cifs_revalidate_dentry(struct dentry *dentry)
1736 {
1737         int rc;
1738         struct inode *inode = dentry->d_inode;
1739
1740         rc = cifs_revalidate_dentry_attr(dentry);
1741         if (rc)
1742                 return rc;
1743
1744         if (CIFS_I(inode)->invalid_mapping)
1745                 rc = cifs_invalidate_mapping(inode);
1746         return rc;
1747 }
1748
1749 int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1750                  struct kstat *stat)
1751 {
1752         struct cifs_sb_info *cifs_sb = CIFS_SB(dentry->d_sb);
1753         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
1754         struct inode *inode = dentry->d_inode;
1755         int rc;
1756
1757         /*
1758          * We need to be sure that all dirty pages are written and the server
1759          * has actual ctime, mtime and file length.
1760          */
1761         if (!CIFS_I(inode)->clientCanCacheRead && inode->i_mapping &&
1762             inode->i_mapping->nrpages != 0) {
1763                 rc = filemap_fdatawait(inode->i_mapping);
1764                 if (rc) {
1765                         mapping_set_error(inode->i_mapping, rc);
1766                         return rc;
1767                 }
1768         }
1769
1770         rc = cifs_revalidate_dentry_attr(dentry);
1771         if (rc)
1772                 return rc;
1773
1774         generic_fillattr(inode, stat);
1775         stat->blksize = CIFS_MAX_MSGSIZE;
1776         stat->ino = CIFS_I(inode)->uniqueid;
1777
1778         /*
1779          * If on a multiuser mount without unix extensions, and the admin hasn't
1780          * overridden them, set the ownership to the fsuid/fsgid of the current
1781          * process.
1782          */
1783         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER) &&
1784             !tcon->unix_ext) {
1785                 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID))
1786                         stat->uid = current_fsuid();
1787                 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID))
1788                         stat->gid = current_fsgid();
1789         }
1790         return rc;
1791 }
1792
1793 static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1794 {
1795         pgoff_t index = from >> PAGE_CACHE_SHIFT;
1796         unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1797         struct page *page;
1798         int rc = 0;
1799
1800         page = grab_cache_page(mapping, index);
1801         if (!page)
1802                 return -ENOMEM;
1803
1804         zero_user_segment(page, offset, PAGE_CACHE_SIZE);
1805         unlock_page(page);
1806         page_cache_release(page);
1807         return rc;
1808 }
1809
1810 static void cifs_setsize(struct inode *inode, loff_t offset)
1811 {
1812         loff_t oldsize;
1813
1814         spin_lock(&inode->i_lock);
1815         oldsize = inode->i_size;
1816         i_size_write(inode, offset);
1817         spin_unlock(&inode->i_lock);
1818
1819         truncate_pagecache(inode, oldsize, offset);
1820 }
1821
1822 static int
1823 cifs_set_file_size(struct inode *inode, struct iattr *attrs,
1824                    unsigned int xid, char *full_path)
1825 {
1826         int rc;
1827         struct cifsFileInfo *open_file;
1828         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1829         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1830         struct tcon_link *tlink = NULL;
1831         struct cifs_tcon *pTcon = NULL;
1832         struct cifs_io_parms io_parms;
1833
1834         /*
1835          * To avoid spurious oplock breaks from server, in the case of
1836          * inodes that we already have open, avoid doing path based
1837          * setting of file size if we can do it by handle.
1838          * This keeps our caching token (oplock) and avoids timeouts
1839          * when the local oplock break takes longer to flush
1840          * writebehind data than the SMB timeout for the SetPathInfo
1841          * request would allow
1842          */
1843         open_file = find_writable_file(cifsInode, true);
1844         if (open_file) {
1845                 __u16 nfid = open_file->netfid;
1846                 __u32 npid = open_file->pid;
1847                 pTcon = tlink_tcon(open_file->tlink);
1848                 rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size, nfid,
1849                                         npid, false);
1850                 cifsFileInfo_put(open_file);
1851                 cFYI(1, "SetFSize for attrs rc = %d", rc);
1852                 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1853                         unsigned int bytes_written;
1854
1855                         io_parms.netfid = nfid;
1856                         io_parms.pid = npid;
1857                         io_parms.tcon = pTcon;
1858                         io_parms.offset = 0;
1859                         io_parms.length = attrs->ia_size;
1860                         rc = CIFSSMBWrite(xid, &io_parms, &bytes_written,
1861                                           NULL, NULL, 1);
1862                         cFYI(1, "Wrt seteof rc %d", rc);
1863                 }
1864         } else
1865                 rc = -EINVAL;
1866
1867         if (rc != 0) {
1868                 if (pTcon == NULL) {
1869                         tlink = cifs_sb_tlink(cifs_sb);
1870                         if (IS_ERR(tlink))
1871                                 return PTR_ERR(tlink);
1872                         pTcon = tlink_tcon(tlink);
1873                 }
1874
1875                 /* Set file size by pathname rather than by handle
1876                    either because no valid, writeable file handle for
1877                    it was found or because there was an error setting
1878                    it by handle */
1879                 rc = CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size,
1880                                    false, cifs_sb->local_nls,
1881                                    cifs_sb->mnt_cifs_flags &
1882                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1883                 cFYI(1, "SetEOF by path (setattrs) rc = %d", rc);
1884                 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1885                         __u16 netfid;
1886                         int oplock = 0;
1887
1888                         rc = SMBLegacyOpen(xid, pTcon, full_path,
1889                                 FILE_OPEN, GENERIC_WRITE,
1890                                 CREATE_NOT_DIR, &netfid, &oplock, NULL,
1891                                 cifs_sb->local_nls,
1892                                 cifs_sb->mnt_cifs_flags &
1893                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1894                         if (rc == 0) {
1895                                 unsigned int bytes_written;
1896
1897                                 io_parms.netfid = netfid;
1898                                 io_parms.pid = current->tgid;
1899                                 io_parms.tcon = pTcon;
1900                                 io_parms.offset = 0;
1901                                 io_parms.length = attrs->ia_size;
1902                                 rc = CIFSSMBWrite(xid, &io_parms,
1903                                                   &bytes_written,
1904                                                   NULL, NULL,  1);
1905                                 cFYI(1, "wrt seteof rc %d", rc);
1906                                 CIFSSMBClose(xid, pTcon, netfid);
1907                         }
1908                 }
1909                 if (tlink)
1910                         cifs_put_tlink(tlink);
1911         }
1912
1913         if (rc == 0) {
1914                 cifsInode->server_eof = attrs->ia_size;
1915                 cifs_setsize(inode, attrs->ia_size);
1916                 cifs_truncate_page(inode->i_mapping, inode->i_size);
1917         }
1918
1919         return rc;
1920 }
1921
1922 static int
1923 cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
1924 {
1925         int rc;
1926         unsigned int xid;
1927         char *full_path = NULL;
1928         struct inode *inode = direntry->d_inode;
1929         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1930         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1931         struct tcon_link *tlink;
1932         struct cifs_tcon *pTcon;
1933         struct cifs_unix_set_info_args *args = NULL;
1934         struct cifsFileInfo *open_file;
1935
1936         cFYI(1, "setattr_unix on file %s attrs->ia_valid=0x%x",
1937                  direntry->d_name.name, attrs->ia_valid);
1938
1939         xid = get_xid();
1940
1941         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
1942                 attrs->ia_valid |= ATTR_FORCE;
1943
1944         rc = inode_change_ok(inode, attrs);
1945         if (rc < 0)
1946                 goto out;
1947
1948         full_path = build_path_from_dentry(direntry);
1949         if (full_path == NULL) {
1950                 rc = -ENOMEM;
1951                 goto out;
1952         }
1953
1954         /*
1955          * Attempt to flush data before changing attributes. We need to do
1956          * this for ATTR_SIZE and ATTR_MTIME for sure, and if we change the
1957          * ownership or mode then we may also need to do this. Here, we take
1958          * the safe way out and just do the flush on all setattr requests. If
1959          * the flush returns error, store it to report later and continue.
1960          *
1961          * BB: This should be smarter. Why bother flushing pages that
1962          * will be truncated anyway? Also, should we error out here if
1963          * the flush returns error?
1964          */
1965         rc = filemap_write_and_wait(inode->i_mapping);
1966         mapping_set_error(inode->i_mapping, rc);
1967         rc = 0;
1968
1969         if (attrs->ia_valid & ATTR_SIZE) {
1970                 rc = cifs_set_file_size(inode, attrs, xid, full_path);
1971                 if (rc != 0)
1972                         goto out;
1973         }
1974
1975         /* skip mode change if it's just for clearing setuid/setgid */
1976         if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
1977                 attrs->ia_valid &= ~ATTR_MODE;
1978
1979         args = kmalloc(sizeof(*args), GFP_KERNEL);
1980         if (args == NULL) {
1981                 rc = -ENOMEM;
1982                 goto out;
1983         }
1984
1985         /* set up the struct */
1986         if (attrs->ia_valid & ATTR_MODE)
1987                 args->mode = attrs->ia_mode;
1988         else
1989                 args->mode = NO_CHANGE_64;
1990
1991         if (attrs->ia_valid & ATTR_UID)
1992                 args->uid = attrs->ia_uid;
1993         else
1994                 args->uid = NO_CHANGE_64;
1995
1996         if (attrs->ia_valid & ATTR_GID)
1997                 args->gid = attrs->ia_gid;
1998         else
1999                 args->gid = NO_CHANGE_64;
2000
2001         if (attrs->ia_valid & ATTR_ATIME)
2002                 args->atime = cifs_UnixTimeToNT(attrs->ia_atime);
2003         else
2004                 args->atime = NO_CHANGE_64;
2005
2006         if (attrs->ia_valid & ATTR_MTIME)
2007                 args->mtime = cifs_UnixTimeToNT(attrs->ia_mtime);
2008         else
2009                 args->mtime = NO_CHANGE_64;
2010
2011         if (attrs->ia_valid & ATTR_CTIME)
2012                 args->ctime = cifs_UnixTimeToNT(attrs->ia_ctime);
2013         else
2014                 args->ctime = NO_CHANGE_64;
2015
2016         args->device = 0;
2017         open_file = find_writable_file(cifsInode, true);
2018         if (open_file) {
2019                 u16 nfid = open_file->netfid;
2020                 u32 npid = open_file->pid;
2021                 pTcon = tlink_tcon(open_file->tlink);
2022                 rc = CIFSSMBUnixSetFileInfo(xid, pTcon, args, nfid, npid);
2023                 cifsFileInfo_put(open_file);
2024         } else {
2025                 tlink = cifs_sb_tlink(cifs_sb);
2026                 if (IS_ERR(tlink)) {
2027                         rc = PTR_ERR(tlink);
2028                         goto out;
2029                 }
2030                 pTcon = tlink_tcon(tlink);
2031                 rc = CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, args,
2032                                     cifs_sb->local_nls,
2033                                     cifs_sb->mnt_cifs_flags &
2034                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
2035                 cifs_put_tlink(tlink);
2036         }
2037
2038         if (rc)
2039                 goto out;
2040
2041         if ((attrs->ia_valid & ATTR_SIZE) &&
2042             attrs->ia_size != i_size_read(inode))
2043                 truncate_setsize(inode, attrs->ia_size);
2044
2045         setattr_copy(inode, attrs);
2046         mark_inode_dirty(inode);
2047
2048         /* force revalidate when any of these times are set since some
2049            of the fs types (eg ext3, fat) do not have fine enough
2050            time granularity to match protocol, and we do not have a
2051            a way (yet) to query the server fs's time granularity (and
2052            whether it rounds times down).
2053         */
2054         if (attrs->ia_valid & (ATTR_MTIME | ATTR_CTIME))
2055                 cifsInode->time = 0;
2056 out:
2057         kfree(args);
2058         kfree(full_path);
2059         free_xid(xid);
2060         return rc;
2061 }
2062
2063 static int
2064 cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
2065 {
2066         unsigned int xid;
2067         uid_t uid = NO_CHANGE_32;
2068         gid_t gid = NO_CHANGE_32;
2069         struct inode *inode = direntry->d_inode;
2070         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2071         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
2072         char *full_path = NULL;
2073         int rc = -EACCES;
2074         __u32 dosattr = 0;
2075         __u64 mode = NO_CHANGE_64;
2076
2077         xid = get_xid();
2078
2079         cFYI(1, "setattr on file %s attrs->iavalid 0x%x",
2080                  direntry->d_name.name, attrs->ia_valid);
2081
2082         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
2083                 attrs->ia_valid |= ATTR_FORCE;
2084
2085         rc = inode_change_ok(inode, attrs);
2086         if (rc < 0) {
2087                 free_xid(xid);
2088                 return rc;
2089         }
2090
2091         full_path = build_path_from_dentry(direntry);
2092         if (full_path == NULL) {
2093                 rc = -ENOMEM;
2094                 free_xid(xid);
2095                 return rc;
2096         }
2097
2098         /*
2099          * Attempt to flush data before changing attributes. We need to do
2100          * this for ATTR_SIZE and ATTR_MTIME for sure, and if we change the
2101          * ownership or mode then we may also need to do this. Here, we take
2102          * the safe way out and just do the flush on all setattr requests. If
2103          * the flush returns error, store it to report later and continue.
2104          *
2105          * BB: This should be smarter. Why bother flushing pages that
2106          * will be truncated anyway? Also, should we error out here if
2107          * the flush returns error?
2108          */
2109         rc = filemap_write_and_wait(inode->i_mapping);
2110         mapping_set_error(inode->i_mapping, rc);
2111         rc = 0;
2112
2113         if (attrs->ia_valid & ATTR_SIZE) {
2114                 rc = cifs_set_file_size(inode, attrs, xid, full_path);
2115                 if (rc != 0)
2116                         goto cifs_setattr_exit;
2117         }
2118
2119         if (attrs->ia_valid & ATTR_UID)
2120                 uid = attrs->ia_uid;
2121
2122         if (attrs->ia_valid & ATTR_GID)
2123                 gid = attrs->ia_gid;
2124
2125 #ifdef CONFIG_CIFS_ACL
2126         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
2127                 if (uid != NO_CHANGE_32 || gid != NO_CHANGE_32) {
2128                         rc = id_mode_to_cifs_acl(inode, full_path, NO_CHANGE_64,
2129                                                         uid, gid);
2130                         if (rc) {
2131                                 cFYI(1, "%s: Setting id failed with error: %d",
2132                                         __func__, rc);
2133                                 goto cifs_setattr_exit;
2134                         }
2135                 }
2136         } else
2137 #endif /* CONFIG_CIFS_ACL */
2138         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID))
2139                 attrs->ia_valid &= ~(ATTR_UID | ATTR_GID);
2140
2141         /* skip mode change if it's just for clearing setuid/setgid */
2142         if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
2143                 attrs->ia_valid &= ~ATTR_MODE;
2144
2145         if (attrs->ia_valid & ATTR_MODE) {
2146                 mode = attrs->ia_mode;
2147                 rc = 0;
2148 #ifdef CONFIG_CIFS_ACL
2149                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
2150                         rc = id_mode_to_cifs_acl(inode, full_path, mode,
2151                                                 NO_CHANGE_32, NO_CHANGE_32);
2152                         if (rc) {
2153                                 cFYI(1, "%s: Setting ACL failed with error: %d",
2154                                         __func__, rc);
2155                                 goto cifs_setattr_exit;
2156                         }
2157                 } else
2158 #endif /* CONFIG_CIFS_ACL */
2159                 if (((mode & S_IWUGO) == 0) &&
2160                     (cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
2161
2162                         dosattr = cifsInode->cifsAttrs | ATTR_READONLY;
2163
2164                         /* fix up mode if we're not using dynperm */
2165                         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
2166                                 attrs->ia_mode = inode->i_mode & ~S_IWUGO;
2167                 } else if ((mode & S_IWUGO) &&
2168                            (cifsInode->cifsAttrs & ATTR_READONLY)) {
2169
2170                         dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
2171                         /* Attributes of 0 are ignored */
2172                         if (dosattr == 0)
2173                                 dosattr |= ATTR_NORMAL;
2174
2175                         /* reset local inode permissions to normal */
2176                         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
2177                                 attrs->ia_mode &= ~(S_IALLUGO);
2178                                 if (S_ISDIR(inode->i_mode))
2179                                         attrs->ia_mode |=
2180                                                 cifs_sb->mnt_dir_mode;
2181                                 else
2182                                         attrs->ia_mode |=
2183                                                 cifs_sb->mnt_file_mode;
2184                         }
2185                 } else if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
2186                         /* ignore mode change - ATTR_READONLY hasn't changed */
2187                         attrs->ia_valid &= ~ATTR_MODE;
2188                 }
2189         }
2190
2191         if (attrs->ia_valid & (ATTR_MTIME|ATTR_ATIME|ATTR_CTIME) ||
2192             ((attrs->ia_valid & ATTR_MODE) && dosattr)) {
2193                 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
2194                 /* BB: check for rc = -EOPNOTSUPP and switch to legacy mode */
2195
2196                 /* Even if error on time set, no sense failing the call if
2197                 the server would set the time to a reasonable value anyway,
2198                 and this check ensures that we are not being called from
2199                 sys_utimes in which case we ought to fail the call back to
2200                 the user when the server rejects the call */
2201                 if ((rc) && (attrs->ia_valid &
2202                                 (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
2203                         rc = 0;
2204         }
2205
2206         /* do not need local check to inode_check_ok since the server does
2207            that */
2208         if (rc)
2209                 goto cifs_setattr_exit;
2210
2211         if ((attrs->ia_valid & ATTR_SIZE) &&
2212             attrs->ia_size != i_size_read(inode))
2213                 truncate_setsize(inode, attrs->ia_size);
2214
2215         setattr_copy(inode, attrs);
2216         mark_inode_dirty(inode);
2217
2218 cifs_setattr_exit:
2219         kfree(full_path);
2220         free_xid(xid);
2221         return rc;
2222 }
2223
2224 int
2225 cifs_setattr(struct dentry *direntry, struct iattr *attrs)
2226 {
2227         struct inode *inode = direntry->d_inode;
2228         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2229         struct cifs_tcon *pTcon = cifs_sb_master_tcon(cifs_sb);
2230
2231         if (pTcon->unix_ext)
2232                 return cifs_setattr_unix(direntry, attrs);
2233
2234         return cifs_setattr_nounix(direntry, attrs);
2235
2236         /* BB: add cifs_setattr_legacy for really old servers */
2237 }
2238
2239 #if 0
2240 void cifs_delete_inode(struct inode *inode)
2241 {
2242         cFYI(1, "In cifs_delete_inode, inode = 0x%p", inode);
2243         /* may have to add back in if and when safe distributed caching of
2244            directories added e.g. via FindNotify */
2245 }
2246 #endif