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 (cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP &
1153                                 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
1154                 rc = CIFSPOSIXDelFile(xid, tcon, full_path,
1155                         SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls,
1156                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1157                 cFYI(1, "posix del rc %d", rc);
1158                 if ((rc == 0) || (rc == -ENOENT))
1159                         goto psx_del_no_retry;
1160         }
1161
1162 retry_std_delete:
1163         rc = CIFSSMBDelFile(xid, tcon, full_path, cifs_sb->local_nls,
1164                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1165
1166 psx_del_no_retry:
1167         if (!rc) {
1168                 if (inode)
1169                         drop_nlink(inode);
1170         } else if (rc == -ENOENT) {
1171                 d_drop(dentry);
1172         } else if (rc == -ETXTBSY) {
1173                 rc = cifs_rename_pending_delete(full_path, dentry, xid);
1174                 if (rc == 0)
1175                         drop_nlink(inode);
1176         } else if ((rc == -EACCES) && (dosattr == 0) && inode) {
1177                 attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
1178                 if (attrs == NULL) {
1179                         rc = -ENOMEM;
1180                         goto out_reval;
1181                 }
1182
1183                 /* try to reset dos attributes */
1184                 cifs_inode = CIFS_I(inode);
1185                 origattr = cifs_inode->cifsAttrs;
1186                 if (origattr == 0)
1187                         origattr |= ATTR_NORMAL;
1188                 dosattr = origattr & ~ATTR_READONLY;
1189                 if (dosattr == 0)
1190                         dosattr |= ATTR_NORMAL;
1191                 dosattr |= ATTR_HIDDEN;
1192
1193                 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
1194                 if (rc != 0)
1195                         goto out_reval;
1196
1197                 goto retry_std_delete;
1198         }
1199
1200         /* undo the setattr if we errored out and it's needed */
1201         if (rc != 0 && dosattr != 0)
1202                 cifs_set_file_info(inode, attrs, xid, full_path, origattr);
1203
1204 out_reval:
1205         if (inode) {
1206                 cifs_inode = CIFS_I(inode);
1207                 cifs_inode->time = 0;   /* will force revalidate to get info
1208                                            when needed */
1209                 inode->i_ctime = current_fs_time(sb);
1210         }
1211         dir->i_ctime = dir->i_mtime = current_fs_time(sb);
1212         cifs_inode = CIFS_I(dir);
1213         CIFS_I(dir)->time = 0;  /* force revalidate of dir as well */
1214 unlink_out:
1215         kfree(full_path);
1216         kfree(attrs);
1217         free_xid(xid);
1218         cifs_put_tlink(tlink);
1219         return rc;
1220 }
1221
1222 static int
1223 cifs_mkdir_qinfo(struct inode *inode, struct dentry *dentry, umode_t mode,
1224                  const char *full_path, struct cifs_sb_info *cifs_sb,
1225                  struct cifs_tcon *tcon, const unsigned int xid)
1226 {
1227         int rc = 0;
1228         struct inode *newinode = NULL;
1229
1230         if (tcon->unix_ext)
1231                 rc = cifs_get_inode_info_unix(&newinode, full_path, inode->i_sb,
1232                                               xid);
1233         else
1234                 rc = cifs_get_inode_info(&newinode, full_path, NULL,
1235                                          inode->i_sb, xid, NULL);
1236         if (rc)
1237                 return rc;
1238
1239         d_instantiate(dentry, newinode);
1240         /*
1241          * setting nlink not necessary except in cases where we failed to get it
1242          * from the server or was set bogus
1243          */
1244         if ((dentry->d_inode) && (dentry->d_inode->i_nlink < 2))
1245                 set_nlink(dentry->d_inode, 2);
1246
1247         mode &= ~current_umask();
1248         /* must turn on setgid bit if parent dir has it */
1249         if (inode->i_mode & S_ISGID)
1250                 mode |= S_ISGID;
1251
1252         if (tcon->unix_ext) {
1253                 struct cifs_unix_set_info_args args = {
1254                         .mode   = mode,
1255                         .ctime  = NO_CHANGE_64,
1256                         .atime  = NO_CHANGE_64,
1257                         .mtime  = NO_CHANGE_64,
1258                         .device = 0,
1259                 };
1260                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1261                         args.uid = (__u64)current_fsuid();
1262                         if (inode->i_mode & S_ISGID)
1263                                 args.gid = (__u64)inode->i_gid;
1264                         else
1265                                 args.gid = (__u64)current_fsgid();
1266                 } else {
1267                         args.uid = NO_CHANGE_64;
1268                         args.gid = NO_CHANGE_64;
1269                 }
1270                 CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args,
1271                                        cifs_sb->local_nls,
1272                                        cifs_sb->mnt_cifs_flags &
1273                                        CIFS_MOUNT_MAP_SPECIAL_CHR);
1274         } else {
1275                 struct TCP_Server_Info *server = tcon->ses->server;
1276                 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
1277                     (mode & S_IWUGO) == 0 && server->ops->mkdir_setinfo)
1278                         server->ops->mkdir_setinfo(newinode, full_path, cifs_sb,
1279                                                    tcon, xid);
1280                 if (dentry->d_inode) {
1281                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
1282                                 dentry->d_inode->i_mode = (mode | S_IFDIR);
1283
1284                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1285                                 dentry->d_inode->i_uid = current_fsuid();
1286                                 if (inode->i_mode & S_ISGID)
1287                                         dentry->d_inode->i_gid = inode->i_gid;
1288                                 else
1289                                         dentry->d_inode->i_gid =
1290                                                                 current_fsgid();
1291                         }
1292                 }
1293         }
1294         return rc;
1295 }
1296
1297 static int
1298 cifs_posix_mkdir(struct inode *inode, struct dentry *dentry, umode_t mode,
1299                  const char *full_path, struct cifs_sb_info *cifs_sb,
1300                  struct cifs_tcon *tcon, const unsigned int xid)
1301 {
1302         int rc = 0;
1303         u32 oplock = 0;
1304         FILE_UNIX_BASIC_INFO *info = NULL;
1305         struct inode *newinode = NULL;
1306         struct cifs_fattr fattr;
1307
1308         info = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
1309         if (info == NULL) {
1310                 rc = -ENOMEM;
1311                 goto posix_mkdir_out;
1312         }
1313
1314         mode &= ~current_umask();
1315         rc = CIFSPOSIXCreate(xid, tcon, SMB_O_DIRECTORY | SMB_O_CREAT, mode,
1316                              NULL /* netfid */, info, &oplock, full_path,
1317                              cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1318                              CIFS_MOUNT_MAP_SPECIAL_CHR);
1319         if (rc == -EOPNOTSUPP)
1320                 goto posix_mkdir_out;
1321         else if (rc) {
1322                 cFYI(1, "posix mkdir returned 0x%x", rc);
1323                 d_drop(dentry);
1324                 goto posix_mkdir_out;
1325         }
1326
1327         if (info->Type == cpu_to_le32(-1))
1328                 /* no return info, go query for it */
1329                 goto posix_mkdir_get_info;
1330         /*
1331          * BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if
1332          * need to set uid/gid.
1333          */
1334
1335         cifs_unix_basic_to_fattr(&fattr, info, cifs_sb);
1336         cifs_fill_uniqueid(inode->i_sb, &fattr);
1337         newinode = cifs_iget(inode->i_sb, &fattr);
1338         if (!newinode)
1339                 goto posix_mkdir_get_info;
1340
1341         d_instantiate(dentry, newinode);
1342
1343 #ifdef CONFIG_CIFS_DEBUG2
1344         cFYI(1, "instantiated dentry %p %s to inode %p", dentry,
1345              dentry->d_name.name, newinode);
1346
1347         if (newinode->i_nlink != 2)
1348                 cFYI(1, "unexpected number of links %d", newinode->i_nlink);
1349 #endif
1350
1351 posix_mkdir_out:
1352         kfree(info);
1353         return rc;
1354 posix_mkdir_get_info:
1355         rc = cifs_mkdir_qinfo(inode, dentry, mode, full_path, cifs_sb, tcon,
1356                               xid);
1357         goto posix_mkdir_out;
1358 }
1359
1360 int cifs_mkdir(struct inode *inode, struct dentry *direntry, umode_t mode)
1361 {
1362         int rc = 0;
1363         unsigned int xid;
1364         struct cifs_sb_info *cifs_sb;
1365         struct tcon_link *tlink;
1366         struct cifs_tcon *tcon;
1367         struct TCP_Server_Info *server;
1368         char *full_path;
1369
1370         cFYI(1, "In cifs_mkdir, mode = 0x%hx inode = 0x%p", mode, inode);
1371
1372         cifs_sb = CIFS_SB(inode->i_sb);
1373         tlink = cifs_sb_tlink(cifs_sb);
1374         if (IS_ERR(tlink))
1375                 return PTR_ERR(tlink);
1376         tcon = tlink_tcon(tlink);
1377
1378         xid = get_xid();
1379
1380         full_path = build_path_from_dentry(direntry);
1381         if (full_path == NULL) {
1382                 rc = -ENOMEM;
1383                 goto mkdir_out;
1384         }
1385
1386         if (cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP &
1387                                 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
1388                 rc = cifs_posix_mkdir(inode, direntry, mode, full_path, cifs_sb,
1389                                       tcon, xid);
1390                 if (rc != -EOPNOTSUPP)
1391                         goto mkdir_out;
1392         }
1393
1394         server = tcon->ses->server;
1395
1396         if (!server->ops->mkdir) {
1397                 rc = -ENOSYS;
1398                 goto mkdir_out;
1399         }
1400
1401         /* BB add setting the equivalent of mode via CreateX w/ACLs */
1402         rc = server->ops->mkdir(xid, tcon, full_path, cifs_sb);
1403         if (rc) {
1404                 cFYI(1, "cifs_mkdir returned 0x%x", rc);
1405                 d_drop(direntry);
1406                 goto mkdir_out;
1407         }
1408
1409         rc = cifs_mkdir_qinfo(inode, direntry, mode, full_path, cifs_sb, tcon,
1410                               xid);
1411 mkdir_out:
1412         /*
1413          * Force revalidate to get parent dir info when needed since cached
1414          * attributes are invalid now.
1415          */
1416         CIFS_I(inode)->time = 0;
1417         kfree(full_path);
1418         free_xid(xid);
1419         cifs_put_tlink(tlink);
1420         return rc;
1421 }
1422
1423 int cifs_rmdir(struct inode *inode, struct dentry *direntry)
1424 {
1425         int rc = 0;
1426         unsigned int xid;
1427         struct cifs_sb_info *cifs_sb;
1428         struct tcon_link *tlink;
1429         struct cifs_tcon *tcon;
1430         struct TCP_Server_Info *server;
1431         char *full_path = NULL;
1432         struct cifsInodeInfo *cifsInode;
1433
1434         cFYI(1, "cifs_rmdir, inode = 0x%p", inode);
1435
1436         xid = get_xid();
1437
1438         full_path = build_path_from_dentry(direntry);
1439         if (full_path == NULL) {
1440                 rc = -ENOMEM;
1441                 goto rmdir_exit;
1442         }
1443
1444         cifs_sb = CIFS_SB(inode->i_sb);
1445         tlink = cifs_sb_tlink(cifs_sb);
1446         if (IS_ERR(tlink)) {
1447                 rc = PTR_ERR(tlink);
1448                 goto rmdir_exit;
1449         }
1450         tcon = tlink_tcon(tlink);
1451         server = tcon->ses->server;
1452
1453         if (!server->ops->rmdir) {
1454                 rc = -ENOSYS;
1455                 cifs_put_tlink(tlink);
1456                 goto rmdir_exit;
1457         }
1458
1459         rc = server->ops->rmdir(xid, tcon, full_path, cifs_sb);
1460         cifs_put_tlink(tlink);
1461
1462         if (!rc) {
1463                 spin_lock(&direntry->d_inode->i_lock);
1464                 i_size_write(direntry->d_inode, 0);
1465                 clear_nlink(direntry->d_inode);
1466                 spin_unlock(&direntry->d_inode->i_lock);
1467         }
1468
1469         cifsInode = CIFS_I(direntry->d_inode);
1470         /* force revalidate to go get info when needed */
1471         cifsInode->time = 0;
1472
1473         cifsInode = CIFS_I(inode);
1474         /*
1475          * Force revalidate to get parent dir info when needed since cached
1476          * attributes are invalid now.
1477          */
1478         cifsInode->time = 0;
1479
1480         direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
1481                 current_fs_time(inode->i_sb);
1482
1483 rmdir_exit:
1484         kfree(full_path);
1485         free_xid(xid);
1486         return rc;
1487 }
1488
1489 static int
1490 cifs_do_rename(unsigned int xid, struct dentry *from_dentry,
1491                const char *fromPath, struct dentry *to_dentry,
1492                const char *toPath)
1493 {
1494         struct cifs_sb_info *cifs_sb = CIFS_SB(from_dentry->d_sb);
1495         struct tcon_link *tlink;
1496         struct cifs_tcon *pTcon;
1497         __u16 srcfid;
1498         int oplock, rc;
1499
1500         tlink = cifs_sb_tlink(cifs_sb);
1501         if (IS_ERR(tlink))
1502                 return PTR_ERR(tlink);
1503         pTcon = tlink_tcon(tlink);
1504
1505         /* try path-based rename first */
1506         rc = CIFSSMBRename(xid, pTcon, fromPath, toPath, cifs_sb->local_nls,
1507                            cifs_sb->mnt_cifs_flags &
1508                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1509
1510         /*
1511          * don't bother with rename by filehandle unless file is busy and
1512          * source Note that cross directory moves do not work with
1513          * rename by filehandle to various Windows servers.
1514          */
1515         if (rc == 0 || rc != -ETXTBSY)
1516                 goto do_rename_exit;
1517
1518         /* open-file renames don't work across directories */
1519         if (to_dentry->d_parent != from_dentry->d_parent)
1520                 goto do_rename_exit;
1521
1522         /* open the file to be renamed -- we need DELETE perms */
1523         rc = CIFSSMBOpen(xid, pTcon, fromPath, FILE_OPEN, DELETE,
1524                          CREATE_NOT_DIR, &srcfid, &oplock, NULL,
1525                          cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1526                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1527
1528         if (rc == 0) {
1529                 rc = CIFSSMBRenameOpenFile(xid, pTcon, srcfid,
1530                                 (const char *) to_dentry->d_name.name,
1531                                 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1532                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1533
1534                 CIFSSMBClose(xid, pTcon, srcfid);
1535         }
1536 do_rename_exit:
1537         cifs_put_tlink(tlink);
1538         return rc;
1539 }
1540
1541 int cifs_rename(struct inode *source_dir, struct dentry *source_dentry,
1542         struct inode *target_dir, struct dentry *target_dentry)
1543 {
1544         char *fromName = NULL;
1545         char *toName = NULL;
1546         struct cifs_sb_info *cifs_sb;
1547         struct tcon_link *tlink;
1548         struct cifs_tcon *tcon;
1549         FILE_UNIX_BASIC_INFO *info_buf_source = NULL;
1550         FILE_UNIX_BASIC_INFO *info_buf_target;
1551         unsigned int xid;
1552         int rc, tmprc;
1553
1554         cifs_sb = CIFS_SB(source_dir->i_sb);
1555         tlink = cifs_sb_tlink(cifs_sb);
1556         if (IS_ERR(tlink))
1557                 return PTR_ERR(tlink);
1558         tcon = tlink_tcon(tlink);
1559
1560         xid = get_xid();
1561
1562         /*
1563          * we already have the rename sem so we do not need to
1564          * grab it again here to protect the path integrity
1565          */
1566         fromName = build_path_from_dentry(source_dentry);
1567         if (fromName == NULL) {
1568                 rc = -ENOMEM;
1569                 goto cifs_rename_exit;
1570         }
1571
1572         toName = build_path_from_dentry(target_dentry);
1573         if (toName == NULL) {
1574                 rc = -ENOMEM;
1575                 goto cifs_rename_exit;
1576         }
1577
1578         rc = cifs_do_rename(xid, source_dentry, fromName,
1579                             target_dentry, toName);
1580
1581         if (rc == -EEXIST && tcon->unix_ext) {
1582                 /*
1583                  * Are src and dst hardlinks of same inode? We can
1584                  * only tell with unix extensions enabled
1585                  */
1586                 info_buf_source =
1587                         kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO),
1588                                         GFP_KERNEL);
1589                 if (info_buf_source == NULL) {
1590                         rc = -ENOMEM;
1591                         goto cifs_rename_exit;
1592                 }
1593
1594                 info_buf_target = info_buf_source + 1;
1595                 tmprc = CIFSSMBUnixQPathInfo(xid, tcon, fromName,
1596                                         info_buf_source,
1597                                         cifs_sb->local_nls,
1598                                         cifs_sb->mnt_cifs_flags &
1599                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1600                 if (tmprc != 0)
1601                         goto unlink_target;
1602
1603                 tmprc = CIFSSMBUnixQPathInfo(xid, tcon, toName,
1604                                         info_buf_target,
1605                                         cifs_sb->local_nls,
1606                                         cifs_sb->mnt_cifs_flags &
1607                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1608
1609                 if (tmprc == 0 && (info_buf_source->UniqueId ==
1610                                    info_buf_target->UniqueId)) {
1611                         /* same file, POSIX says that this is a noop */
1612                         rc = 0;
1613                         goto cifs_rename_exit;
1614                 }
1615         } /* else ... BB we could add the same check for Windows by
1616                      checking the UniqueId via FILE_INTERNAL_INFO */
1617
1618 unlink_target:
1619         /* Try unlinking the target dentry if it's not negative */
1620         if (target_dentry->d_inode && (rc == -EACCES || rc == -EEXIST)) {
1621                 tmprc = cifs_unlink(target_dir, target_dentry);
1622                 if (tmprc)
1623                         goto cifs_rename_exit;
1624
1625                 rc = cifs_do_rename(xid, source_dentry, fromName,
1626                                     target_dentry, toName);
1627         }
1628
1629 cifs_rename_exit:
1630         kfree(info_buf_source);
1631         kfree(fromName);
1632         kfree(toName);
1633         free_xid(xid);
1634         cifs_put_tlink(tlink);
1635         return rc;
1636 }
1637
1638 static bool
1639 cifs_inode_needs_reval(struct inode *inode)
1640 {
1641         struct cifsInodeInfo *cifs_i = CIFS_I(inode);
1642         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1643
1644         if (cifs_i->clientCanCacheRead)
1645                 return false;
1646
1647         if (!lookupCacheEnabled)
1648                 return true;
1649
1650         if (cifs_i->time == 0)
1651                 return true;
1652
1653         if (!time_in_range(jiffies, cifs_i->time,
1654                                 cifs_i->time + cifs_sb->actimeo))
1655                 return true;
1656
1657         /* hardlinked files w/ noserverino get "special" treatment */
1658         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) &&
1659             S_ISREG(inode->i_mode) && inode->i_nlink != 1)
1660                 return true;
1661
1662         return false;
1663 }
1664
1665 /*
1666  * Zap the cache. Called when invalid_mapping flag is set.
1667  */
1668 int
1669 cifs_invalidate_mapping(struct inode *inode)
1670 {
1671         int rc = 0;
1672         struct cifsInodeInfo *cifs_i = CIFS_I(inode);
1673
1674         cifs_i->invalid_mapping = false;
1675
1676         if (inode->i_mapping && inode->i_mapping->nrpages != 0) {
1677                 rc = invalidate_inode_pages2(inode->i_mapping);
1678                 if (rc) {
1679                         cERROR(1, "%s: could not invalidate inode %p", __func__,
1680                                inode);
1681                         cifs_i->invalid_mapping = true;
1682                 }
1683         }
1684
1685         cifs_fscache_reset_inode_cookie(inode);
1686         return rc;
1687 }
1688
1689 int cifs_revalidate_file_attr(struct file *filp)
1690 {
1691         int rc = 0;
1692         struct inode *inode = filp->f_path.dentry->d_inode;
1693         struct cifsFileInfo *cfile = (struct cifsFileInfo *) filp->private_data;
1694
1695         if (!cifs_inode_needs_reval(inode))
1696                 return rc;
1697
1698         if (tlink_tcon(cfile->tlink)->unix_ext)
1699                 rc = cifs_get_file_info_unix(filp);
1700         else
1701                 rc = cifs_get_file_info(filp);
1702
1703         return rc;
1704 }
1705
1706 int cifs_revalidate_dentry_attr(struct dentry *dentry)
1707 {
1708         unsigned int xid;
1709         int rc = 0;
1710         struct inode *inode = dentry->d_inode;
1711         struct super_block *sb = dentry->d_sb;
1712         char *full_path = NULL;
1713
1714         if (inode == NULL)
1715                 return -ENOENT;
1716
1717         if (!cifs_inode_needs_reval(inode))
1718                 return rc;
1719
1720         xid = get_xid();
1721
1722         /* can not safely grab the rename sem here if rename calls revalidate
1723            since that would deadlock */
1724         full_path = build_path_from_dentry(dentry);
1725         if (full_path == NULL) {
1726                 rc = -ENOMEM;
1727                 goto out;
1728         }
1729
1730         cFYI(1, "Update attributes: %s inode 0x%p count %d dentry: 0x%p d_time "
1731                  "%ld jiffies %ld", full_path, inode, inode->i_count.counter,
1732                  dentry, dentry->d_time, jiffies);
1733
1734         if (cifs_sb_master_tcon(CIFS_SB(sb))->unix_ext)
1735                 rc = cifs_get_inode_info_unix(&inode, full_path, sb, xid);
1736         else
1737                 rc = cifs_get_inode_info(&inode, full_path, NULL, sb,
1738                                          xid, NULL);
1739
1740 out:
1741         kfree(full_path);
1742         free_xid(xid);
1743         return rc;
1744 }
1745
1746 int cifs_revalidate_file(struct file *filp)
1747 {
1748         int rc;
1749         struct inode *inode = filp->f_path.dentry->d_inode;
1750
1751         rc = cifs_revalidate_file_attr(filp);
1752         if (rc)
1753                 return rc;
1754
1755         if (CIFS_I(inode)->invalid_mapping)
1756                 rc = cifs_invalidate_mapping(inode);
1757         return rc;
1758 }
1759
1760 /* revalidate a dentry's inode attributes */
1761 int cifs_revalidate_dentry(struct dentry *dentry)
1762 {
1763         int rc;
1764         struct inode *inode = dentry->d_inode;
1765
1766         rc = cifs_revalidate_dentry_attr(dentry);
1767         if (rc)
1768                 return rc;
1769
1770         if (CIFS_I(inode)->invalid_mapping)
1771                 rc = cifs_invalidate_mapping(inode);
1772         return rc;
1773 }
1774
1775 int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1776                  struct kstat *stat)
1777 {
1778         struct cifs_sb_info *cifs_sb = CIFS_SB(dentry->d_sb);
1779         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
1780         struct inode *inode = dentry->d_inode;
1781         int rc;
1782
1783         /*
1784          * We need to be sure that all dirty pages are written and the server
1785          * has actual ctime, mtime and file length.
1786          */
1787         if (!CIFS_I(inode)->clientCanCacheRead && inode->i_mapping &&
1788             inode->i_mapping->nrpages != 0) {
1789                 rc = filemap_fdatawait(inode->i_mapping);
1790                 if (rc) {
1791                         mapping_set_error(inode->i_mapping, rc);
1792                         return rc;
1793                 }
1794         }
1795
1796         rc = cifs_revalidate_dentry_attr(dentry);
1797         if (rc)
1798                 return rc;
1799
1800         generic_fillattr(inode, stat);
1801         stat->blksize = CIFS_MAX_MSGSIZE;
1802         stat->ino = CIFS_I(inode)->uniqueid;
1803
1804         /*
1805          * If on a multiuser mount without unix extensions, and the admin hasn't
1806          * overridden them, set the ownership to the fsuid/fsgid of the current
1807          * process.
1808          */
1809         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER) &&
1810             !tcon->unix_ext) {
1811                 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID))
1812                         stat->uid = current_fsuid();
1813                 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID))
1814                         stat->gid = current_fsgid();
1815         }
1816         return rc;
1817 }
1818
1819 static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1820 {
1821         pgoff_t index = from >> PAGE_CACHE_SHIFT;
1822         unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1823         struct page *page;
1824         int rc = 0;
1825
1826         page = grab_cache_page(mapping, index);
1827         if (!page)
1828                 return -ENOMEM;
1829
1830         zero_user_segment(page, offset, PAGE_CACHE_SIZE);
1831         unlock_page(page);
1832         page_cache_release(page);
1833         return rc;
1834 }
1835
1836 static void cifs_setsize(struct inode *inode, loff_t offset)
1837 {
1838         loff_t oldsize;
1839
1840         spin_lock(&inode->i_lock);
1841         oldsize = inode->i_size;
1842         i_size_write(inode, offset);
1843         spin_unlock(&inode->i_lock);
1844
1845         truncate_pagecache(inode, oldsize, offset);
1846 }
1847
1848 static int
1849 cifs_set_file_size(struct inode *inode, struct iattr *attrs,
1850                    unsigned int xid, char *full_path)
1851 {
1852         int rc;
1853         struct cifsFileInfo *open_file;
1854         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1855         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1856         struct tcon_link *tlink = NULL;
1857         struct cifs_tcon *pTcon = NULL;
1858         struct cifs_io_parms io_parms;
1859
1860         /*
1861          * To avoid spurious oplock breaks from server, in the case of
1862          * inodes that we already have open, avoid doing path based
1863          * setting of file size if we can do it by handle.
1864          * This keeps our caching token (oplock) and avoids timeouts
1865          * when the local oplock break takes longer to flush
1866          * writebehind data than the SMB timeout for the SetPathInfo
1867          * request would allow
1868          */
1869         open_file = find_writable_file(cifsInode, true);
1870         if (open_file) {
1871                 __u16 nfid = open_file->netfid;
1872                 __u32 npid = open_file->pid;
1873                 pTcon = tlink_tcon(open_file->tlink);
1874                 rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size, nfid,
1875                                         npid, false);
1876                 cifsFileInfo_put(open_file);
1877                 cFYI(1, "SetFSize for attrs rc = %d", rc);
1878                 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1879                         unsigned int bytes_written;
1880
1881                         io_parms.netfid = nfid;
1882                         io_parms.pid = npid;
1883                         io_parms.tcon = pTcon;
1884                         io_parms.offset = 0;
1885                         io_parms.length = attrs->ia_size;
1886                         rc = CIFSSMBWrite(xid, &io_parms, &bytes_written,
1887                                           NULL, NULL, 1);
1888                         cFYI(1, "Wrt seteof rc %d", rc);
1889                 }
1890         } else
1891                 rc = -EINVAL;
1892
1893         if (rc != 0) {
1894                 if (pTcon == NULL) {
1895                         tlink = cifs_sb_tlink(cifs_sb);
1896                         if (IS_ERR(tlink))
1897                                 return PTR_ERR(tlink);
1898                         pTcon = tlink_tcon(tlink);
1899                 }
1900
1901                 /* Set file size by pathname rather than by handle
1902                    either because no valid, writeable file handle for
1903                    it was found or because there was an error setting
1904                    it by handle */
1905                 rc = CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size,
1906                                    false, cifs_sb->local_nls,
1907                                    cifs_sb->mnt_cifs_flags &
1908                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1909                 cFYI(1, "SetEOF by path (setattrs) rc = %d", rc);
1910                 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1911                         __u16 netfid;
1912                         int oplock = 0;
1913
1914                         rc = SMBLegacyOpen(xid, pTcon, full_path,
1915                                 FILE_OPEN, GENERIC_WRITE,
1916                                 CREATE_NOT_DIR, &netfid, &oplock, NULL,
1917                                 cifs_sb->local_nls,
1918                                 cifs_sb->mnt_cifs_flags &
1919                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1920                         if (rc == 0) {
1921                                 unsigned int bytes_written;
1922
1923                                 io_parms.netfid = netfid;
1924                                 io_parms.pid = current->tgid;
1925                                 io_parms.tcon = pTcon;
1926                                 io_parms.offset = 0;
1927                                 io_parms.length = attrs->ia_size;
1928                                 rc = CIFSSMBWrite(xid, &io_parms,
1929                                                   &bytes_written,
1930                                                   NULL, NULL,  1);
1931                                 cFYI(1, "wrt seteof rc %d", rc);
1932                                 CIFSSMBClose(xid, pTcon, netfid);
1933                         }
1934                 }
1935                 if (tlink)
1936                         cifs_put_tlink(tlink);
1937         }
1938
1939         if (rc == 0) {
1940                 cifsInode->server_eof = attrs->ia_size;
1941                 cifs_setsize(inode, attrs->ia_size);
1942                 cifs_truncate_page(inode->i_mapping, inode->i_size);
1943         }
1944
1945         return rc;
1946 }
1947
1948 static int
1949 cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
1950 {
1951         int rc;
1952         unsigned int xid;
1953         char *full_path = NULL;
1954         struct inode *inode = direntry->d_inode;
1955         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1956         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1957         struct tcon_link *tlink;
1958         struct cifs_tcon *pTcon;
1959         struct cifs_unix_set_info_args *args = NULL;
1960         struct cifsFileInfo *open_file;
1961
1962         cFYI(1, "setattr_unix on file %s attrs->ia_valid=0x%x",
1963                  direntry->d_name.name, attrs->ia_valid);
1964
1965         xid = get_xid();
1966
1967         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
1968                 attrs->ia_valid |= ATTR_FORCE;
1969
1970         rc = inode_change_ok(inode, attrs);
1971         if (rc < 0)
1972                 goto out;
1973
1974         full_path = build_path_from_dentry(direntry);
1975         if (full_path == NULL) {
1976                 rc = -ENOMEM;
1977                 goto out;
1978         }
1979
1980         /*
1981          * Attempt to flush data before changing attributes. We need to do
1982          * this for ATTR_SIZE and ATTR_MTIME for sure, and if we change the
1983          * ownership or mode then we may also need to do this. Here, we take
1984          * the safe way out and just do the flush on all setattr requests. If
1985          * the flush returns error, store it to report later and continue.
1986          *
1987          * BB: This should be smarter. Why bother flushing pages that
1988          * will be truncated anyway? Also, should we error out here if
1989          * the flush returns error?
1990          */
1991         rc = filemap_write_and_wait(inode->i_mapping);
1992         mapping_set_error(inode->i_mapping, rc);
1993         rc = 0;
1994
1995         if (attrs->ia_valid & ATTR_SIZE) {
1996                 rc = cifs_set_file_size(inode, attrs, xid, full_path);
1997                 if (rc != 0)
1998                         goto out;
1999         }
2000
2001         /* skip mode change if it's just for clearing setuid/setgid */
2002         if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
2003                 attrs->ia_valid &= ~ATTR_MODE;
2004
2005         args = kmalloc(sizeof(*args), GFP_KERNEL);
2006         if (args == NULL) {
2007                 rc = -ENOMEM;
2008                 goto out;
2009         }
2010
2011         /* set up the struct */
2012         if (attrs->ia_valid & ATTR_MODE)
2013                 args->mode = attrs->ia_mode;
2014         else
2015                 args->mode = NO_CHANGE_64;
2016
2017         if (attrs->ia_valid & ATTR_UID)
2018                 args->uid = attrs->ia_uid;
2019         else
2020                 args->uid = NO_CHANGE_64;
2021
2022         if (attrs->ia_valid & ATTR_GID)
2023                 args->gid = attrs->ia_gid;
2024         else
2025                 args->gid = NO_CHANGE_64;
2026
2027         if (attrs->ia_valid & ATTR_ATIME)
2028                 args->atime = cifs_UnixTimeToNT(attrs->ia_atime);
2029         else
2030                 args->atime = NO_CHANGE_64;
2031
2032         if (attrs->ia_valid & ATTR_MTIME)
2033                 args->mtime = cifs_UnixTimeToNT(attrs->ia_mtime);
2034         else
2035                 args->mtime = NO_CHANGE_64;
2036
2037         if (attrs->ia_valid & ATTR_CTIME)
2038                 args->ctime = cifs_UnixTimeToNT(attrs->ia_ctime);
2039         else
2040                 args->ctime = NO_CHANGE_64;
2041
2042         args->device = 0;
2043         open_file = find_writable_file(cifsInode, true);
2044         if (open_file) {
2045                 u16 nfid = open_file->netfid;
2046                 u32 npid = open_file->pid;
2047                 pTcon = tlink_tcon(open_file->tlink);
2048                 rc = CIFSSMBUnixSetFileInfo(xid, pTcon, args, nfid, npid);
2049                 cifsFileInfo_put(open_file);
2050         } else {
2051                 tlink = cifs_sb_tlink(cifs_sb);
2052                 if (IS_ERR(tlink)) {
2053                         rc = PTR_ERR(tlink);
2054                         goto out;
2055                 }
2056                 pTcon = tlink_tcon(tlink);
2057                 rc = CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, args,
2058                                     cifs_sb->local_nls,
2059                                     cifs_sb->mnt_cifs_flags &
2060                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
2061                 cifs_put_tlink(tlink);
2062         }
2063
2064         if (rc)
2065                 goto out;
2066
2067         if ((attrs->ia_valid & ATTR_SIZE) &&
2068             attrs->ia_size != i_size_read(inode))
2069                 truncate_setsize(inode, attrs->ia_size);
2070
2071         setattr_copy(inode, attrs);
2072         mark_inode_dirty(inode);
2073
2074         /* force revalidate when any of these times are set since some
2075            of the fs types (eg ext3, fat) do not have fine enough
2076            time granularity to match protocol, and we do not have a
2077            a way (yet) to query the server fs's time granularity (and
2078            whether it rounds times down).
2079         */
2080         if (attrs->ia_valid & (ATTR_MTIME | ATTR_CTIME))
2081                 cifsInode->time = 0;
2082 out:
2083         kfree(args);
2084         kfree(full_path);
2085         free_xid(xid);
2086         return rc;
2087 }
2088
2089 static int
2090 cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
2091 {
2092         unsigned int xid;
2093         uid_t uid = NO_CHANGE_32;
2094         gid_t gid = NO_CHANGE_32;
2095         struct inode *inode = direntry->d_inode;
2096         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2097         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
2098         char *full_path = NULL;
2099         int rc = -EACCES;
2100         __u32 dosattr = 0;
2101         __u64 mode = NO_CHANGE_64;
2102
2103         xid = get_xid();
2104
2105         cFYI(1, "setattr on file %s attrs->iavalid 0x%x",
2106                  direntry->d_name.name, attrs->ia_valid);
2107
2108         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
2109                 attrs->ia_valid |= ATTR_FORCE;
2110
2111         rc = inode_change_ok(inode, attrs);
2112         if (rc < 0) {
2113                 free_xid(xid);
2114                 return rc;
2115         }
2116
2117         full_path = build_path_from_dentry(direntry);
2118         if (full_path == NULL) {
2119                 rc = -ENOMEM;
2120                 free_xid(xid);
2121                 return rc;
2122         }
2123
2124         /*
2125          * Attempt to flush data before changing attributes. We need to do
2126          * this for ATTR_SIZE and ATTR_MTIME for sure, and if we change the
2127          * ownership or mode then we may also need to do this. Here, we take
2128          * the safe way out and just do the flush on all setattr requests. If
2129          * the flush returns error, store it to report later and continue.
2130          *
2131          * BB: This should be smarter. Why bother flushing pages that
2132          * will be truncated anyway? Also, should we error out here if
2133          * the flush returns error?
2134          */
2135         rc = filemap_write_and_wait(inode->i_mapping);
2136         mapping_set_error(inode->i_mapping, rc);
2137         rc = 0;
2138
2139         if (attrs->ia_valid & ATTR_SIZE) {
2140                 rc = cifs_set_file_size(inode, attrs, xid, full_path);
2141                 if (rc != 0)
2142                         goto cifs_setattr_exit;
2143         }
2144
2145         if (attrs->ia_valid & ATTR_UID)
2146                 uid = attrs->ia_uid;
2147
2148         if (attrs->ia_valid & ATTR_GID)
2149                 gid = attrs->ia_gid;
2150
2151 #ifdef CONFIG_CIFS_ACL
2152         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
2153                 if (uid != NO_CHANGE_32 || gid != NO_CHANGE_32) {
2154                         rc = id_mode_to_cifs_acl(inode, full_path, NO_CHANGE_64,
2155                                                         uid, gid);
2156                         if (rc) {
2157                                 cFYI(1, "%s: Setting id failed with error: %d",
2158                                         __func__, rc);
2159                                 goto cifs_setattr_exit;
2160                         }
2161                 }
2162         } else
2163 #endif /* CONFIG_CIFS_ACL */
2164         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID))
2165                 attrs->ia_valid &= ~(ATTR_UID | ATTR_GID);
2166
2167         /* skip mode change if it's just for clearing setuid/setgid */
2168         if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
2169                 attrs->ia_valid &= ~ATTR_MODE;
2170
2171         if (attrs->ia_valid & ATTR_MODE) {
2172                 mode = attrs->ia_mode;
2173                 rc = 0;
2174 #ifdef CONFIG_CIFS_ACL
2175                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
2176                         rc = id_mode_to_cifs_acl(inode, full_path, mode,
2177                                                 NO_CHANGE_32, NO_CHANGE_32);
2178                         if (rc) {
2179                                 cFYI(1, "%s: Setting ACL failed with error: %d",
2180                                         __func__, rc);
2181                                 goto cifs_setattr_exit;
2182                         }
2183                 } else
2184 #endif /* CONFIG_CIFS_ACL */
2185                 if (((mode & S_IWUGO) == 0) &&
2186                     (cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
2187
2188                         dosattr = cifsInode->cifsAttrs | ATTR_READONLY;
2189
2190                         /* fix up mode if we're not using dynperm */
2191                         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
2192                                 attrs->ia_mode = inode->i_mode & ~S_IWUGO;
2193                 } else if ((mode & S_IWUGO) &&
2194                            (cifsInode->cifsAttrs & ATTR_READONLY)) {
2195
2196                         dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
2197                         /* Attributes of 0 are ignored */
2198                         if (dosattr == 0)
2199                                 dosattr |= ATTR_NORMAL;
2200
2201                         /* reset local inode permissions to normal */
2202                         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
2203                                 attrs->ia_mode &= ~(S_IALLUGO);
2204                                 if (S_ISDIR(inode->i_mode))
2205                                         attrs->ia_mode |=
2206                                                 cifs_sb->mnt_dir_mode;
2207                                 else
2208                                         attrs->ia_mode |=
2209                                                 cifs_sb->mnt_file_mode;
2210                         }
2211                 } else if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
2212                         /* ignore mode change - ATTR_READONLY hasn't changed */
2213                         attrs->ia_valid &= ~ATTR_MODE;
2214                 }
2215         }
2216
2217         if (attrs->ia_valid & (ATTR_MTIME|ATTR_ATIME|ATTR_CTIME) ||
2218             ((attrs->ia_valid & ATTR_MODE) && dosattr)) {
2219                 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
2220                 /* BB: check for rc = -EOPNOTSUPP and switch to legacy mode */
2221
2222                 /* Even if error on time set, no sense failing the call if
2223                 the server would set the time to a reasonable value anyway,
2224                 and this check ensures that we are not being called from
2225                 sys_utimes in which case we ought to fail the call back to
2226                 the user when the server rejects the call */
2227                 if ((rc) && (attrs->ia_valid &
2228                                 (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
2229                         rc = 0;
2230         }
2231
2232         /* do not need local check to inode_check_ok since the server does
2233            that */
2234         if (rc)
2235                 goto cifs_setattr_exit;
2236
2237         if ((attrs->ia_valid & ATTR_SIZE) &&
2238             attrs->ia_size != i_size_read(inode))
2239                 truncate_setsize(inode, attrs->ia_size);
2240
2241         setattr_copy(inode, attrs);
2242         mark_inode_dirty(inode);
2243
2244 cifs_setattr_exit:
2245         kfree(full_path);
2246         free_xid(xid);
2247         return rc;
2248 }
2249
2250 int
2251 cifs_setattr(struct dentry *direntry, struct iattr *attrs)
2252 {
2253         struct inode *inode = direntry->d_inode;
2254         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2255         struct cifs_tcon *pTcon = cifs_sb_master_tcon(cifs_sb);
2256
2257         if (pTcon->unix_ext)
2258                 return cifs_setattr_unix(direntry, attrs);
2259
2260         return cifs_setattr_nounix(direntry, attrs);
2261
2262         /* BB: add cifs_setattr_legacy for really old servers */
2263 }
2264
2265 #if 0
2266 void cifs_delete_inode(struct inode *inode)
2267 {
2268         cFYI(1, "In cifs_delete_inode, inode = 0x%p", inode);
2269         /* may have to add back in if and when safe distributed caching of
2270            directories added e.g. via FindNotify */
2271 }
2272 #endif