Pileus Git - ~andy/linux/blob - fs/cifs/inode.c

   1 /*
   2  *   fs/cifs/inode.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2002,2010
   5  *   Author(s): Steve French (sfrench@us.ibm.com)
   6  *
   7  *   This library is free software; you can redistribute it and/or modify
   8  *   it under the terms of the GNU Lesser General Public License as published
   9  *   by the Free Software Foundation; either version 2.1 of the License, or
  10  *   (at your option) any later version.
  11  *
  12  *   This library is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  15  *   the GNU Lesser General Public License for more details.
  16  *
  17  *   You should have received a copy of the GNU Lesser General Public License
  18  *   along with this library; if not, write to the Free Software
  19  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  20  */
  21 #include <linux/fs.h>
  22 #include <linux/stat.h>
  23 #include <linux/slab.h>
  24 #include <linux/pagemap.h>
  25 #include <asm/div64.h>
  26 #include "cifsfs.h"
  27 #include "cifspdu.h"
  28 #include "cifsglob.h"
  29 #include "cifsproto.h"
  30 #include "cifs_debug.h"
  31 #include "cifs_fs_sb.h"
  32 #include "fscache.h"
  33
  34
  35 static void cifs_set_ops(struct inode *inode)
  36 {
  37         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
  38
  39         switch (inode->i_mode & S_IFMT) {
  40         case S_IFREG:
  41                 inode->i_op = &cifs_file_inode_ops;
  42                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
  43                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
  44                                 inode->i_fop = &cifs_file_direct_nobrl_ops;
  45                         else
  46                                 inode->i_fop = &cifs_file_direct_ops;
  47                 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) {
  48                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
  49                                 inode->i_fop = &cifs_file_strict_nobrl_ops;
  50                         else
  51                                 inode->i_fop = &cifs_file_strict_ops;
  52                 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
  53                         inode->i_fop = &cifs_file_nobrl_ops;
  54                 else { /* not direct, send byte range locks */
  55                         inode->i_fop = &cifs_file_ops;
  56                 }
  57
  58                 /* check if server can support readpages */
  59                 if (cifs_sb_master_tcon(cifs_sb)->ses->server->maxBuf <
  60                                 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE)
  61                         inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
  62                 else
  63                         inode->i_data.a_ops = &cifs_addr_ops;
  64                 break;
  65         case S_IFDIR:
  66 #ifdef CONFIG_CIFS_DFS_UPCALL
  67                 if (IS_AUTOMOUNT(inode)) {
  68                         inode->i_op = &cifs_dfs_referral_inode_operations;
  69                 } else {
  70 #else /* NO DFS support, treat as a directory */
  71                 {
  72 #endif
  73                         inode->i_op = &cifs_dir_inode_ops;
  74                         inode->i_fop = &cifs_dir_ops;
  75                 }
  76                 break;
  77         case S_IFLNK:
  78                 inode->i_op = &cifs_symlink_inode_ops;
  79                 break;
  80         default:
  81                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
  82                 break;
  83         }
  84 }
  85
  86 /* check inode attributes against fattr. If they don't match, tag the
  87  * inode for cache invalidation
  88  */
  89 static void
  90 cifs_revalidate_cache(struct inode *inode, struct cifs_fattr *fattr)
  91 {
  92         struct cifsInodeInfo *cifs_i = CIFS_I(inode);
  93
  94         cFYI(1, "%s: revalidating inode %llu", __func__, cifs_i->uniqueid);
  95
  96         if (inode->i_state & I_NEW) {
  97                 cFYI(1, "%s: inode %llu is new", __func__, cifs_i->uniqueid);
  98                 return;
  99         }
 100
 101         /* don't bother with revalidation if we have an oplock */
 102         if (cifs_i->clientCanCacheRead) {
 103                 cFYI(1, "%s: inode %llu is oplocked", __func__,
 104                          cifs_i->uniqueid);
 105                 return;
 106         }
 107
 108          /* revalidate if mtime or size have changed */
 109         if (timespec_equal(&inode->i_mtime, &fattr->cf_mtime) &&
 110             cifs_i->server_eof == fattr->cf_eof) {
 111                 cFYI(1, "%s: inode %llu is unchanged", __func__,
 112                          cifs_i->uniqueid);
 113                 return;
 114         }
 115
 116         cFYI(1, "%s: invalidating inode %llu mapping", __func__,
 117                  cifs_i->uniqueid);
 118         cifs_i->invalid_mapping = true;
 119 }
 120
 121 /* populate an inode with info from a cifs_fattr struct */
 122 void
 123 cifs_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr)
 124 {
 125         struct cifsInodeInfo *cifs_i = CIFS_I(inode);
 126         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 127
 128         cifs_revalidate_cache(inode, fattr);
 129
 130         spin_lock(&inode->i_lock);
 131         inode->i_atime = fattr->cf_atime;
 132         inode->i_mtime = fattr->cf_mtime;
 133         inode->i_ctime = fattr->cf_ctime;
 134         inode->i_rdev = fattr->cf_rdev;
 135         set_nlink(inode, fattr->cf_nlink);
 136         inode->i_uid = fattr->cf_uid;
 137         inode->i_gid = fattr->cf_gid;
 138
 139         /* if dynperm is set, don't clobber existing mode */
 140         if (inode->i_state & I_NEW ||
 141             !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM))
 142                 inode->i_mode = fattr->cf_mode;
 143
 144         cifs_i->cifsAttrs = fattr->cf_cifsattrs;
 145
 146         if (fattr->cf_flags & CIFS_FATTR_NEED_REVAL)
 147                 cifs_i->time = 0;
 148         else
 149                 cifs_i->time = jiffies;
 150
 151         cifs_i->delete_pending = fattr->cf_flags & CIFS_FATTR_DELETE_PENDING;
 152
 153         cifs_i->server_eof = fattr->cf_eof;
 154         /*
 155          * Can't safely change the file size here if the client is writing to
 156          * it due to potential races.
 157          */
 158         if (is_size_safe_to_change(cifs_i, fattr->cf_eof)) {
 159                 i_size_write(inode, fattr->cf_eof);
 160
 161                 /*
 162                  * i_blocks is not related to (i_size / i_blksize),
 163                  * but instead 512 byte (2**9) size is required for
 164                  * calculating num blocks.
 165                  */
 166                 inode->i_blocks = (512 - 1 + fattr->cf_bytes) >> 9;
 167         }
 168         spin_unlock(&inode->i_lock);
 169
 170         if (fattr->cf_flags & CIFS_FATTR_DFS_REFERRAL)
 171                 inode->i_flags |= S_AUTOMOUNT;
 172         cifs_set_ops(inode);
 173 }
 174
 175 void
 176 cifs_fill_uniqueid(struct super_block *sb, struct cifs_fattr *fattr)
 177 {
 178         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 179
 180         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 181                 return;
 182
 183         fattr->cf_uniqueid = iunique(sb, ROOT_I);
 184 }
 185
 186 /* Fill a cifs_fattr struct with info from FILE_UNIX_BASIC_INFO. */
 187 void
 188 cifs_unix_basic_to_fattr(struct cifs_fattr *fattr, FILE_UNIX_BASIC_INFO *info,
 189                          struct cifs_sb_info *cifs_sb)
 190 {
 191         memset(fattr, 0, sizeof(*fattr));
 192         fattr->cf_uniqueid = le64_to_cpu(info->UniqueId);
 193         fattr->cf_bytes = le64_to_cpu(info->NumOfBytes);
 194         fattr->cf_eof = le64_to_cpu(info->EndOfFile);
 195
 196         fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
 197         fattr->cf_mtime = cifs_NTtimeToUnix(info->LastModificationTime);
 198         fattr->cf_ctime = cifs_NTtimeToUnix(info->LastStatusChange);
 199         fattr->cf_mode = le64_to_cpu(info->Permissions);
 200
 201         /*
 202          * Since we set the inode type below we need to mask off
 203          * to avoid strange results if bits set above.
 204          */
 205         fattr->cf_mode &= ~S_IFMT;
 206         switch (le32_to_cpu(info->Type)) {
 207         case UNIX_FILE:
 208                 fattr->cf_mode |= S_IFREG;
 209                 fattr->cf_dtype = DT_REG;
 210                 break;
 211         case UNIX_SYMLINK:
 212                 fattr->cf_mode |= S_IFLNK;
 213                 fattr->cf_dtype = DT_LNK;
 214                 break;
 215         case UNIX_DIR:
 216                 fattr->cf_mode |= S_IFDIR;
 217                 fattr->cf_dtype = DT_DIR;
 218                 break;
 219         case UNIX_CHARDEV:
 220                 fattr->cf_mode |= S_IFCHR;
 221                 fattr->cf_dtype = DT_CHR;
 222                 fattr->cf_rdev = MKDEV(le64_to_cpu(info->DevMajor),
 223                                        le64_to_cpu(info->DevMinor) & MINORMASK);
 224                 break;
 225         case UNIX_BLOCKDEV:
 226                 fattr->cf_mode |= S_IFBLK;
 227                 fattr->cf_dtype = DT_BLK;
 228                 fattr->cf_rdev = MKDEV(le64_to_cpu(info->DevMajor),
 229                                        le64_to_cpu(info->DevMinor) & MINORMASK);
 230                 break;
 231         case UNIX_FIFO:
 232                 fattr->cf_mode |= S_IFIFO;
 233                 fattr->cf_dtype = DT_FIFO;
 234                 break;
 235         case UNIX_SOCKET:
 236                 fattr->cf_mode |= S_IFSOCK;
 237                 fattr->cf_dtype = DT_SOCK;
 238                 break;
 239         default:
 240                 /* safest to call it a file if we do not know */
 241                 fattr->cf_mode |= S_IFREG;
 242                 fattr->cf_dtype = DT_REG;
 243                 cFYI(1, "unknown type %d", le32_to_cpu(info->Type));
 244                 break;
 245         }
 246
 247         fattr->cf_uid = cifs_sb->mnt_uid;
 248         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)) {
 249                 u64 id = le64_to_cpu(info->Uid);
 250                 if (id < ((uid_t)-1)) {
 251                         kuid_t uid = make_kuid(&init_user_ns, id);
 252                         if (uid_valid(uid))
 253                                 fattr->cf_uid = uid;
 254                 }
 255         }
 256
 257         fattr->cf_gid = cifs_sb->mnt_gid;
 258         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)) {
 259                 u64 id = le64_to_cpu(info->Gid);
 260                 if (id < ((gid_t)-1)) {
 261                         kgid_t gid = make_kgid(&init_user_ns, id);
 262                         if (gid_valid(gid))
 263                                 fattr->cf_gid = gid;
 264                 }
 265         }
 266
 267         fattr->cf_nlink = le64_to_cpu(info->Nlinks);
 268 }
 269
 270 /*
 271  * Fill a cifs_fattr struct with fake inode info.
 272  *
 273  * Needed to setup cifs_fattr data for the directory which is the
 274  * junction to the new submount (ie to setup the fake directory
 275  * which represents a DFS referral).
 276  */
 277 static void
 278 cifs_create_dfs_fattr(struct cifs_fattr *fattr, struct super_block *sb)
 279 {
 280         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 281
 282         cFYI(1, "creating fake fattr for DFS referral");
 283
 284         memset(fattr, 0, sizeof(*fattr));
 285         fattr->cf_mode = S_IFDIR | S_IXUGO | S_IRWXU;
 286         fattr->cf_uid = cifs_sb->mnt_uid;
 287         fattr->cf_gid = cifs_sb->mnt_gid;
 288         fattr->cf_atime = CURRENT_TIME;
 289         fattr->cf_ctime = CURRENT_TIME;
 290         fattr->cf_mtime = CURRENT_TIME;
 291         fattr->cf_nlink = 2;
 292         fattr->cf_flags |= CIFS_FATTR_DFS_REFERRAL;
 293 }
 294
 295 static int
 296 cifs_get_file_info_unix(struct file *filp)
 297 {
 298         int rc;
 299         unsigned int xid;
 300         FILE_UNIX_BASIC_INFO find_data;
 301         struct cifs_fattr fattr;
 302         struct inode *inode = file_inode(filp);
 303         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 304         struct cifsFileInfo *cfile = filp->private_data;
 305         struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
 306
 307         xid = get_xid();
 308         rc = CIFSSMBUnixQFileInfo(xid, tcon, cfile->fid.netfid, &find_data);
 309         if (!rc) {
 310                 cifs_unix_basic_to_fattr(&fattr, &find_data, cifs_sb);
 311         } else if (rc == -EREMOTE) {
 312                 cifs_create_dfs_fattr(&fattr, inode->i_sb);
 313                 rc = 0;
 314         }
 315
 316         cifs_fattr_to_inode(inode, &fattr);
 317         free_xid(xid);
 318         return rc;
 319 }
 320
 321 int cifs_get_inode_info_unix(struct inode **pinode,
 322                              const unsigned char *full_path,
 323                              struct super_block *sb, unsigned int xid)
 324 {
 325         int rc;
 326         FILE_UNIX_BASIC_INFO find_data;
 327         struct cifs_fattr fattr;
 328         struct cifs_tcon *tcon;
 329         struct tcon_link *tlink;
 330         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 331
 332         cFYI(1, "Getting info on %s", full_path);
 333
 334         tlink = cifs_sb_tlink(cifs_sb);
 335         if (IS_ERR(tlink))
 336                 return PTR_ERR(tlink);
 337         tcon = tlink_tcon(tlink);
 338
 339         /* could have done a find first instead but this returns more info */
 340         rc = CIFSSMBUnixQPathInfo(xid, tcon, full_path, &find_data,
 341                                   cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
 342                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 343         cifs_put_tlink(tlink);
 344
 345         if (!rc) {
 346                 cifs_unix_basic_to_fattr(&fattr, &find_data, cifs_sb);
 347         } else if (rc == -EREMOTE) {
 348                 cifs_create_dfs_fattr(&fattr, sb);
 349                 rc = 0;
 350         } else {
 351                 return rc;
 352         }
 353
 354         /* check for Minshall+French symlinks */
 355         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
 356                 int tmprc = CIFSCheckMFSymlink(&fattr, full_path, cifs_sb, xid);
 357                 if (tmprc)
 358                         cFYI(1, "CIFSCheckMFSymlink: %d", tmprc);
 359         }
 360
 361         if (*pinode == NULL) {
 362                 /* get new inode */
 363                 cifs_fill_uniqueid(sb, &fattr);
 364                 *pinode = cifs_iget(sb, &fattr);
 365                 if (!*pinode)
 366                         rc = -ENOMEM;
 367         } else {
 368                 /* we already have inode, update it */
 369                 cifs_fattr_to_inode(*pinode, &fattr);
 370         }
 371
 372         return rc;
 373 }
 374
 375 static int
 376 cifs_sfu_type(struct cifs_fattr *fattr, const unsigned char *path,
 377               struct cifs_sb_info *cifs_sb, unsigned int xid)
 378 {
 379         int rc;
 380         int oplock = 0;
 381         __u16 netfid;
 382         struct tcon_link *tlink;
 383         struct cifs_tcon *tcon;
 384         struct cifs_io_parms io_parms;
 385         char buf[24];
 386         unsigned int bytes_read;
 387         char *pbuf;
 388
 389         pbuf = buf;
 390
 391         fattr->cf_mode &= ~S_IFMT;
 392
 393         if (fattr->cf_eof == 0) {
 394                 fattr->cf_mode |= S_IFIFO;
 395                 fattr->cf_dtype = DT_FIFO;
 396                 return 0;
 397         } else if (fattr->cf_eof < 8) {
 398                 fattr->cf_mode |= S_IFREG;
 399                 fattr->cf_dtype = DT_REG;
 400                 return -EINVAL;  /* EOPNOTSUPP? */
 401         }
 402
 403         tlink = cifs_sb_tlink(cifs_sb);
 404         if (IS_ERR(tlink))
 405                 return PTR_ERR(tlink);
 406         tcon = tlink_tcon(tlink);
 407
 408         rc = CIFSSMBOpen(xid, tcon, path, FILE_OPEN, GENERIC_READ,
 409                          CREATE_NOT_DIR, &netfid, &oplock, NULL,
 410                          cifs_sb->local_nls,
 411                          cifs_sb->mnt_cifs_flags &
 412                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 413         if (rc == 0) {
 414                 int buf_type = CIFS_NO_BUFFER;
 415                         /* Read header */
 416                 io_parms.netfid = netfid;
 417                 io_parms.pid = current->tgid;
 418                 io_parms.tcon = tcon;
 419                 io_parms.offset = 0;
 420                 io_parms.length = 24;
 421                 rc = CIFSSMBRead(xid, &io_parms, &bytes_read, &pbuf,
 422                                  &buf_type);
 423                 if ((rc == 0) && (bytes_read >= 8)) {
 424                         if (memcmp("IntxBLK", pbuf, 8) == 0) {
 425                                 cFYI(1, "Block device");
 426                                 fattr->cf_mode |= S_IFBLK;
 427                                 fattr->cf_dtype = DT_BLK;
 428                                 if (bytes_read == 24) {
 429                                         /* we have enough to decode dev num */
 430                                         __u64 mjr; /* major */
 431                                         __u64 mnr; /* minor */
 432                                         mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
 433                                         mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
 434                                         fattr->cf_rdev = MKDEV(mjr, mnr);
 435                                 }
 436                         } else if (memcmp("IntxCHR", pbuf, 8) == 0) {
 437                                 cFYI(1, "Char device");
 438                                 fattr->cf_mode |= S_IFCHR;
 439                                 fattr->cf_dtype = DT_CHR;
 440                                 if (bytes_read == 24) {
 441                                         /* we have enough to decode dev num */
 442                                         __u64 mjr; /* major */
 443                                         __u64 mnr; /* minor */
 444                                         mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
 445                                         mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
 446                                         fattr->cf_rdev = MKDEV(mjr, mnr);
 447                                 }
 448                         } else if (memcmp("IntxLNK", pbuf, 7) == 0) {
 449                                 cFYI(1, "Symlink");
 450                                 fattr->cf_mode |= S_IFLNK;
 451                                 fattr->cf_dtype = DT_LNK;
 452                         } else {
 453                                 fattr->cf_mode |= S_IFREG; /* file? */
 454                                 fattr->cf_dtype = DT_REG;
 455                                 rc = -EOPNOTSUPP;
 456                         }
 457                 } else {
 458                         fattr->cf_mode |= S_IFREG; /* then it is a file */
 459                         fattr->cf_dtype = DT_REG;
 460                         rc = -EOPNOTSUPP; /* or some unknown SFU type */
 461                 }
 462                 CIFSSMBClose(xid, tcon, netfid);
 463         }
 464         cifs_put_tlink(tlink);
 465         return rc;
 466 }
 467
 468 #define SFBITS_MASK (S_ISVTX | S_ISGID | S_ISUID)  /* SETFILEBITS valid bits */
 469
 470 /*
 471  * Fetch mode bits as provided by SFU.
 472  *
 473  * FIXME: Doesn't this clobber the type bit we got from cifs_sfu_type ?
 474  */
 475 static int cifs_sfu_mode(struct cifs_fattr *fattr, const unsigned char *path,
 476                          struct cifs_sb_info *cifs_sb, unsigned int xid)
 477 {
 478 #ifdef CONFIG_CIFS_XATTR
 479         ssize_t rc;
 480         char ea_value[4];
 481         __u32 mode;
 482         struct tcon_link *tlink;
 483         struct cifs_tcon *tcon;
 484
 485         tlink = cifs_sb_tlink(cifs_sb);
 486         if (IS_ERR(tlink))
 487                 return PTR_ERR(tlink);
 488         tcon = tlink_tcon(tlink);
 489
 490         rc = CIFSSMBQAllEAs(xid, tcon, path, "SETFILEBITS",
 491                             ea_value, 4 /* size of buf */, cifs_sb->local_nls,
 492                             cifs_sb->mnt_cifs_flags &
 493                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 494         cifs_put_tlink(tlink);
 495         if (rc < 0)
 496                 return (int)rc;
 497         else if (rc > 3) {
 498                 mode = le32_to_cpu(*((__le32 *)ea_value));
 499                 fattr->cf_mode &= ~SFBITS_MASK;
 500                 cFYI(1, "special bits 0%o org mode 0%o", mode,
 501                          fattr->cf_mode);
 502                 fattr->cf_mode = (mode & SFBITS_MASK) | fattr->cf_mode;
 503                 cFYI(1, "special mode bits 0%o", mode);
 504         }
 505
 506         return 0;
 507 #else
 508         return -EOPNOTSUPP;
 509 #endif
 510 }
 511
 512 /* Fill a cifs_fattr struct with info from FILE_ALL_INFO */
 513 static void
 514 cifs_all_info_to_fattr(struct cifs_fattr *fattr, FILE_ALL_INFO *info,
 515                        struct cifs_sb_info *cifs_sb, bool adjust_tz)
 516 {
 517         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
 518
 519         memset(fattr, 0, sizeof(*fattr));
 520         fattr->cf_cifsattrs = le32_to_cpu(info->Attributes);
 521         if (info->DeletePending)
 522                 fattr->cf_flags |= CIFS_FATTR_DELETE_PENDING;
 523
 524         if (info->LastAccessTime)
 525                 fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
 526         else
 527                 fattr->cf_atime = CURRENT_TIME;
 528
 529         fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime);
 530         fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
 531
 532         if (adjust_tz) {
 533                 fattr->cf_ctime.tv_sec += tcon->ses->server->timeAdj;
 534                 fattr->cf_mtime.tv_sec += tcon->ses->server->timeAdj;
 535         }
 536
 537         fattr->cf_eof = le64_to_cpu(info->EndOfFile);
 538         fattr->cf_bytes = le64_to_cpu(info->AllocationSize);
 539         fattr->cf_createtime = le64_to_cpu(info->CreationTime);
 540
 541         if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
 542                 fattr->cf_mode = S_IFDIR | cifs_sb->mnt_dir_mode;
 543                 fattr->cf_dtype = DT_DIR;
 544                 /*
 545                  * Server can return wrong NumberOfLinks value for directories
 546                  * when Unix extensions are disabled - fake it.
 547                  */
 548                 fattr->cf_nlink = 2;
 549         } else {
 550                 fattr->cf_mode = S_IFREG | cifs_sb->mnt_file_mode;
 551                 fattr->cf_dtype = DT_REG;
 552
 553                 /* clear write bits if ATTR_READONLY is set */
 554                 if (fattr->cf_cifsattrs & ATTR_READONLY)
 555                         fattr->cf_mode &= ~(S_IWUGO);
 556
 557                 fattr->cf_nlink = le32_to_cpu(info->NumberOfLinks);
 558         }
 559
 560         fattr->cf_uid = cifs_sb->mnt_uid;
 561         fattr->cf_gid = cifs_sb->mnt_gid;
 562 }
 563
 564 static int
 565 cifs_get_file_info(struct file *filp)
 566 {
 567         int rc;
 568         unsigned int xid;
 569         FILE_ALL_INFO find_data;
 570         struct cifs_fattr fattr;
 571         struct inode *inode = file_inode(filp);
 572         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 573         struct cifsFileInfo *cfile = filp->private_data;
 574         struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
 575         struct TCP_Server_Info *server = tcon->ses->server;
 576
 577         if (!server->ops->query_file_info)
 578                 return -ENOSYS;
 579
 580         xid = get_xid();
 581         rc = server->ops->query_file_info(xid, tcon, &cfile->fid, &find_data);
 582         switch (rc) {
 583         case 0:
 584                 cifs_all_info_to_fattr(&fattr, &find_data, cifs_sb, false);
 585                 break;
 586         case -EREMOTE:
 587                 cifs_create_dfs_fattr(&fattr, inode->i_sb);
 588                 rc = 0;
 589                 break;
 590         case -EOPNOTSUPP:
 591         case -EINVAL:
 592                 /*
 593                  * FIXME: legacy server -- fall back to path-based call?
 594                  * for now, just skip revalidating and mark inode for
 595                  * immediate reval.
 596                  */
 597                 rc = 0;
 598                 CIFS_I(inode)->time = 0;
 599         default:
 600                 goto cgfi_exit;
 601         }
 602
 603         /*
 604          * don't bother with SFU junk here -- just mark inode as needing
 605          * revalidation.
 606          */
 607         fattr.cf_uniqueid = CIFS_I(inode)->uniqueid;
 608         fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
 609         cifs_fattr_to_inode(inode, &fattr);
 610 cgfi_exit:
 611         free_xid(xid);
 612         return rc;
 613 }
 614
 615 int
 616 cifs_get_inode_info(struct inode **inode, const char *full_path,
 617                     FILE_ALL_INFO *data, struct super_block *sb, int xid,
 618                     const __u16 *fid)
 619 {
 620         bool validinum = false;
 621         __u16 srchflgs;
 622         int rc = 0, tmprc = ENOSYS;
 623         struct cifs_tcon *tcon;
 624         struct TCP_Server_Info *server;
 625         struct tcon_link *tlink;
 626         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 627         char *buf = NULL;
 628         bool adjust_tz = false;
 629         struct cifs_fattr fattr;
 630         struct cifs_search_info *srchinf = NULL;
 631
 632         tlink = cifs_sb_tlink(cifs_sb);
 633         if (IS_ERR(tlink))
 634                 return PTR_ERR(tlink);
 635         tcon = tlink_tcon(tlink);
 636         server = tcon->ses->server;
 637
 638         cFYI(1, "Getting info on %s", full_path);
 639
 640         if ((data == NULL) && (*inode != NULL)) {
 641                 if (CIFS_I(*inode)->clientCanCacheRead) {
 642                         cFYI(1, "No need to revalidate cached inode sizes");
 643                         goto cgii_exit;
 644                 }
 645         }
 646
 647         /* if inode info is not passed, get it from server */
 648         if (data == NULL) {
 649                 if (!server->ops->query_path_info) {
 650                         rc = -ENOSYS;
 651                         goto cgii_exit;
 652                 }
 653                 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
 654                 if (buf == NULL) {
 655                         rc = -ENOMEM;
 656                         goto cgii_exit;
 657                 }
 658                 data = (FILE_ALL_INFO *)buf;
 659                 rc = server->ops->query_path_info(xid, tcon, cifs_sb, full_path,
 660                                                   data, &adjust_tz);
 661         }
 662
 663         if (!rc) {
 664                 cifs_all_info_to_fattr(&fattr, (FILE_ALL_INFO *)data, cifs_sb,
 665                                        adjust_tz);
 666         } else if (rc == -EREMOTE) {
 667                 cifs_create_dfs_fattr(&fattr, sb);
 668                 rc = 0;
 669         } else if (rc == -EACCES && backup_cred(cifs_sb)) {
 670                         srchinf = kzalloc(sizeof(struct cifs_search_info),
 671                                                 GFP_KERNEL);
 672                         if (srchinf == NULL) {
 673                                 rc = -ENOMEM;
 674                                 goto cgii_exit;
 675                         }
 676
 677                         srchinf->endOfSearch = false;
 678                         srchinf->info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
 679
 680                         srchflgs = CIFS_SEARCH_CLOSE_ALWAYS |
 681                                         CIFS_SEARCH_CLOSE_AT_END |
 682                                         CIFS_SEARCH_BACKUP_SEARCH;
 683
 684                         rc = CIFSFindFirst(xid, tcon, full_path,
 685                                 cifs_sb, NULL, srchflgs, srchinf, false);
 686                         if (!rc) {
 687                                 data =
 688                                 (FILE_ALL_INFO *)srchinf->srch_entries_start;
 689
 690                                 cifs_dir_info_to_fattr(&fattr,
 691                                 (FILE_DIRECTORY_INFO *)data, cifs_sb);
 692                                 fattr.cf_uniqueid = le64_to_cpu(
 693                                 ((SEARCH_ID_FULL_DIR_INFO *)data)->UniqueId);
 694                                 validinum = true;
 695
 696                                 cifs_buf_release(srchinf->ntwrk_buf_start);
 697                         }
 698                         kfree(srchinf);
 699         } else
 700                 goto cgii_exit;
 701
 702         /*
 703          * If an inode wasn't passed in, then get the inode number
 704          *
 705          * Is an i_ino of zero legal? Can we use that to check if the server
 706          * supports returning inode numbers?  Are there other sanity checks we
 707          * can use to ensure that the server is really filling in that field?
 708          */
 709         if (*inode == NULL) {
 710                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 711                         if (validinum == false) {
 712                                 if (server->ops->get_srv_inum)
 713                                         tmprc = server->ops->get_srv_inum(xid,
 714                                                 tcon, cifs_sb, full_path,
 715                                                 &fattr.cf_uniqueid, data);
 716                                 if (tmprc) {
 717                                         cFYI(1, "GetSrvInodeNum rc %d", tmprc);
 718                                         fattr.cf_uniqueid = iunique(sb, ROOT_I);
 719                                         cifs_autodisable_serverino(cifs_sb);
 720                                 }
 721                         }
 722                 } else
 723                         fattr.cf_uniqueid = iunique(sb, ROOT_I);
 724         } else
 725                 fattr.cf_uniqueid = CIFS_I(*inode)->uniqueid;
 726
 727         /* query for SFU type info if supported and needed */
 728         if (fattr.cf_cifsattrs & ATTR_SYSTEM &&
 729             cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
 730                 tmprc = cifs_sfu_type(&fattr, full_path, cifs_sb, xid);
 731                 if (tmprc)
 732                         cFYI(1, "cifs_sfu_type failed: %d", tmprc);
 733         }
 734
 735 #ifdef CONFIG_CIFS_ACL
 736         /* fill in 0777 bits from ACL */
 737         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
 738                 rc = cifs_acl_to_fattr(cifs_sb, &fattr, *inode, full_path, fid);
 739                 if (rc) {
 740                         cFYI(1, "%s: Getting ACL failed with error: %d",
 741                                 __func__, rc);
 742                         goto cgii_exit;
 743                 }
 744         }
 745 #endif /* CONFIG_CIFS_ACL */
 746
 747         /* fill in remaining high mode bits e.g. SUID, VTX */
 748         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
 749                 cifs_sfu_mode(&fattr, full_path, cifs_sb, xid);
 750
 751         /* check for Minshall+French symlinks */
 752         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
 753                 tmprc = CIFSCheckMFSymlink(&fattr, full_path, cifs_sb, xid);
 754                 if (tmprc)
 755                         cFYI(1, "CIFSCheckMFSymlink: %d", tmprc);
 756         }
 757
 758         if (!*inode) {
 759                 *inode = cifs_iget(sb, &fattr);
 760                 if (!*inode)
 761                         rc = -ENOMEM;
 762         } else {
 763                 cifs_fattr_to_inode(*inode, &fattr);
 764         }
 765
 766 cgii_exit:
 767         kfree(buf);
 768         cifs_put_tlink(tlink);
 769         return rc;
 770 }
 771
 772 static const struct inode_operations cifs_ipc_inode_ops = {
 773         .lookup = cifs_lookup,
 774 };
 775
 776 static int
 777 cifs_find_inode(struct inode *inode, void *opaque)
 778 {
 779         struct cifs_fattr *fattr = (struct cifs_fattr *) opaque;
 780
 781         /* don't match inode with different uniqueid */
 782         if (CIFS_I(inode)->uniqueid != fattr->cf_uniqueid)
 783                 return 0;
 784
 785         /* use createtime like an i_generation field */
 786         if (CIFS_I(inode)->createtime != fattr->cf_createtime)
 787                 return 0;
 788
 789         /* don't match inode of different type */
 790         if ((inode->i_mode & S_IFMT) != (fattr->cf_mode & S_IFMT))
 791                 return 0;
 792
 793         /* if it's not a directory or has no dentries, then flag it */
 794         if (S_ISDIR(inode->i_mode) && !hlist_empty(&inode->i_dentry))
 795                 fattr->cf_flags |= CIFS_FATTR_INO_COLLISION;
 796
 797         return 1;
 798 }
 799
 800 static int
 801 cifs_init_inode(struct inode *inode, void *opaque)
 802 {
 803         struct cifs_fattr *fattr = (struct cifs_fattr *) opaque;
 804
 805         CIFS_I(inode)->uniqueid = fattr->cf_uniqueid;
 806         CIFS_I(inode)->createtime = fattr->cf_createtime;
 807         return 0;
 808 }
 809
 810 /*
 811  * walk dentry list for an inode and report whether it has aliases that
 812  * are hashed. We use this to determine if a directory inode can actually
 813  * be used.
 814  */
 815 static bool
 816 inode_has_hashed_dentries(struct inode *inode)
 817 {
 818         struct dentry *dentry;
 819
 820         spin_lock(&inode->i_lock);
 821         hlist_for_each_entry(dentry, &inode->i_dentry, d_alias) {
 822                 if (!d_unhashed(dentry) || IS_ROOT(dentry)) {
 823                         spin_unlock(&inode->i_lock);
 824                         return true;
 825                 }
 826         }
 827         spin_unlock(&inode->i_lock);
 828         return false;
 829 }
 830
 831 /* Given fattrs, get a corresponding inode */
 832 struct inode *
 833 cifs_iget(struct super_block *sb, struct cifs_fattr *fattr)
 834 {
 835         unsigned long hash;
 836         struct inode *inode;
 837
 838 retry_iget5_locked:
 839         cFYI(1, "looking for uniqueid=%llu", fattr->cf_uniqueid);
 840
 841         /* hash down to 32-bits on 32-bit arch */
 842         hash = cifs_uniqueid_to_ino_t(fattr->cf_uniqueid);
 843
 844         inode = iget5_locked(sb, hash, cifs_find_inode, cifs_init_inode, fattr);
 845         if (inode) {
 846                 /* was there a potentially problematic inode collision? */
 847                 if (fattr->cf_flags & CIFS_FATTR_INO_COLLISION) {
 848                         fattr->cf_flags &= ~CIFS_FATTR_INO_COLLISION;
 849
 850                         if (inode_has_hashed_dentries(inode)) {
 851                                 cifs_autodisable_serverino(CIFS_SB(sb));
 852                                 iput(inode);
 853                                 fattr->cf_uniqueid = iunique(sb, ROOT_I);
 854                                 goto retry_iget5_locked;
 855                         }
 856                 }
 857
 858                 cifs_fattr_to_inode(inode, fattr);
 859                 if (sb->s_flags & MS_NOATIME)
 860                         inode->i_flags |= S_NOATIME | S_NOCMTIME;
 861                 if (inode->i_state & I_NEW) {
 862                         inode->i_ino = hash;
 863                         if (S_ISREG(inode->i_mode))
 864                                 inode->i_data.backing_dev_info = sb->s_bdi;
 865 #ifdef CONFIG_CIFS_FSCACHE
 866                         /* initialize per-inode cache cookie pointer */
 867                         CIFS_I(inode)->fscache = NULL;
 868 #endif
 869                         unlock_new_inode(inode);
 870                 }
 871         }
 872
 873         return inode;
 874 }
 875
 876 /* gets root inode */
 877 struct inode *cifs_root_iget(struct super_block *sb)
 878 {
 879         unsigned int xid;
 880         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 881         struct inode *inode = NULL;
 882         long rc;
 883         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
 884
 885         xid = get_xid();
 886         if (tcon->unix_ext)
 887                 rc = cifs_get_inode_info_unix(&inode, "", sb, xid);
 888         else
 889                 rc = cifs_get_inode_info(&inode, "", NULL, sb, xid, NULL);
 890
 891         if (!inode) {
 892                 inode = ERR_PTR(rc);
 893                 goto out;
 894         }
 895
 896 #ifdef CONFIG_CIFS_FSCACHE
 897         /* populate tcon->resource_id */
 898         tcon->resource_id = CIFS_I(inode)->uniqueid;
 899 #endif
 900
 901         if (rc && tcon->ipc) {
 902                 cFYI(1, "ipc connection - fake read inode");
 903                 spin_lock(&inode->i_lock);
 904                 inode->i_mode |= S_IFDIR;
 905                 set_nlink(inode, 2);
 906                 inode->i_op = &cifs_ipc_inode_ops;
 907                 inode->i_fop = &simple_dir_operations;
 908                 inode->i_uid = cifs_sb->mnt_uid;
 909                 inode->i_gid = cifs_sb->mnt_gid;
 910                 spin_unlock(&inode->i_lock);
 911         } else if (rc) {
 912                 iget_failed(inode);
 913                 inode = ERR_PTR(rc);
 914         }
 915
 916 out:
 917         /* can not call macro free_xid here since in a void func
 918          * TODO: This is no longer true
 919          */
 920         _free_xid(xid);
 921         return inode;
 922 }
 923
 924 int
 925 cifs_set_file_info(struct inode *inode, struct iattr *attrs, unsigned int xid,
 926                    char *full_path, __u32 dosattr)
 927 {
 928         bool set_time = false;
 929         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 930         struct TCP_Server_Info *server;
 931         FILE_BASIC_INFO info_buf;
 932
 933         if (attrs == NULL)
 934                 return -EINVAL;
 935
 936         server = cifs_sb_master_tcon(cifs_sb)->ses->server;
 937         if (!server->ops->set_file_info)
 938                 return -ENOSYS;
 939
 940         if (attrs->ia_valid & ATTR_ATIME) {
 941                 set_time = true;
 942                 info_buf.LastAccessTime =
 943                         cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
 944         } else
 945                 info_buf.LastAccessTime = 0;
 946
 947         if (attrs->ia_valid & ATTR_MTIME) {
 948                 set_time = true;
 949                 info_buf.LastWriteTime =
 950                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
 951         } else
 952                 info_buf.LastWriteTime = 0;
 953
 954         /*
 955          * Samba throws this field away, but windows may actually use it.
 956          * Do not set ctime unless other time stamps are changed explicitly
 957          * (i.e. by utimes()) since we would then have a mix of client and
 958          * server times.
 959          */
 960         if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
 961                 cFYI(1, "CIFS - CTIME changed");
 962                 info_buf.ChangeTime =
 963                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
 964         } else
 965                 info_buf.ChangeTime = 0;
 966
 967         info_buf.CreationTime = 0;      /* don't change */
 968         info_buf.Attributes = cpu_to_le32(dosattr);
 969
 970         return server->ops->set_file_info(inode, full_path, &info_buf, xid);
 971 }
 972
 973 /*
 974  * Open the given file (if it isn't already), set the DELETE_ON_CLOSE bit
 975  * and rename it to a random name that hopefully won't conflict with
 976  * anything else.
 977  */
 978 int
 979 cifs_rename_pending_delete(const char *full_path, struct dentry *dentry,
 980                            const unsigned int xid)
 981 {
 982         int oplock = 0;
 983         int rc;
 984         __u16 netfid;
 985         struct inode *inode = dentry->d_inode;
 986         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
 987         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 988         struct tcon_link *tlink;
 989         struct cifs_tcon *tcon;
 990         __u32 dosattr, origattr;
 991         FILE_BASIC_INFO *info_buf = NULL;
 992
 993         tlink = cifs_sb_tlink(cifs_sb);
 994         if (IS_ERR(tlink))
 995                 return PTR_ERR(tlink);
 996         tcon = tlink_tcon(tlink);
 997
 998         /*
 999          * We cannot rename the file if the server doesn't support
1000          * CAP_INFOLEVEL_PASSTHRU
1001          */
1002         if (!(tcon->ses->capabilities & CAP_INFOLEVEL_PASSTHRU)) {
1003                 rc = -EBUSY;
1004                 goto out;
1005         }
1006
1007         rc = CIFSSMBOpen(xid, tcon, full_path, FILE_OPEN,
1008                          DELETE|FILE_WRITE_ATTRIBUTES, CREATE_NOT_DIR,
1009                          &netfid, &oplock, NULL, cifs_sb->local_nls,
1010                          cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1011         if (rc != 0)
1012                 goto out;
1013
1014         origattr = cifsInode->cifsAttrs;
1015         if (origattr == 0)
1016                 origattr |= ATTR_NORMAL;
1017
1018         dosattr = origattr & ~ATTR_READONLY;
1019         if (dosattr == 0)
1020                 dosattr |= ATTR_NORMAL;
1021         dosattr |= ATTR_HIDDEN;
1022
1023         /* set ATTR_HIDDEN and clear ATTR_READONLY, but only if needed */
1024         if (dosattr != origattr) {
1025                 info_buf = kzalloc(sizeof(*info_buf), GFP_KERNEL);
1026                 if (info_buf == NULL) {
1027                         rc = -ENOMEM;
1028                         goto out_close;
1029                 }
1030                 info_buf->Attributes = cpu_to_le32(dosattr);
1031                 rc = CIFSSMBSetFileInfo(xid, tcon, info_buf, netfid,
1032                                         current->tgid);
1033                 /* although we would like to mark the file hidden
1034                    if that fails we will still try to rename it */
1035                 if (!rc)
1036                         cifsInode->cifsAttrs = dosattr;
1037                 else
1038                         dosattr = origattr; /* since not able to change them */
1039         }
1040
1041         /* rename the file */
1042         rc = CIFSSMBRenameOpenFile(xid, tcon, netfid, NULL, cifs_sb->local_nls,
1043                                    cifs_sb->mnt_cifs_flags &
1044                                             CIFS_MOUNT_MAP_SPECIAL_CHR);
1045         if (rc != 0) {
1046                 rc = -EBUSY;
1047                 goto undo_setattr;
1048         }
1049
1050         /* try to set DELETE_ON_CLOSE */
1051         if (!cifsInode->delete_pending) {
1052                 rc = CIFSSMBSetFileDisposition(xid, tcon, true, netfid,
1053                                                current->tgid);
1054                 /*
1055                  * some samba versions return -ENOENT when we try to set the
1056                  * file disposition here. Likely a samba bug, but work around
1057                  * it for now. This means that some cifsXXX files may hang
1058                  * around after they shouldn't.
1059                  *
1060                  * BB: remove this hack after more servers have the fix
1061                  */
1062                 if (rc == -ENOENT)
1063                         rc = 0;
1064                 else if (rc != 0) {
1065                         rc = -EBUSY;
1066                         goto undo_rename;
1067                 }
1068                 cifsInode->delete_pending = true;
1069         }
1070
1071 out_close:
1072         CIFSSMBClose(xid, tcon, netfid);
1073 out:
1074         kfree(info_buf);
1075         cifs_put_tlink(tlink);
1076         return rc;
1077
1078         /*
1079          * reset everything back to the original state. Don't bother
1080          * dealing with errors here since we can't do anything about
1081          * them anyway.
1082          */
1083 undo_rename:
1084         CIFSSMBRenameOpenFile(xid, tcon, netfid, dentry->d_name.name,
1085                                 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1086                                             CIFS_MOUNT_MAP_SPECIAL_CHR);
1087 undo_setattr:
1088         if (dosattr != origattr) {
1089                 info_buf->Attributes = cpu_to_le32(origattr);
1090                 if (!CIFSSMBSetFileInfo(xid, tcon, info_buf, netfid,
1091                                         current->tgid))
1092                         cifsInode->cifsAttrs = origattr;
1093         }
1094
1095         goto out_close;
1096 }
1097
1098 /* copied from fs/nfs/dir.c with small changes */
1099 static void
1100 cifs_drop_nlink(struct inode *inode)
1101 {
1102         spin_lock(&inode->i_lock);
1103         if (inode->i_nlink > 0)
1104                 drop_nlink(inode);
1105         spin_unlock(&inode->i_lock);
1106 }
1107
1108 /*
1109  * If dentry->d_inode is null (usually meaning the cached dentry
1110  * is a negative dentry) then we would attempt a standard SMB delete, but
1111  * if that fails we can not attempt the fall back mechanisms on EACCESS
1112  * but will return the EACCESS to the caller. Note that the VFS does not call
1113  * unlink on negative dentries currently.
1114  */
1115 int cifs_unlink(struct inode *dir, struct dentry *dentry)
1116 {
1117         int rc = 0;
1118         unsigned int xid;
1119         char *full_path = NULL;
1120         struct inode *inode = dentry->d_inode;
1121         struct cifsInodeInfo *cifs_inode;
1122         struct super_block *sb = dir->i_sb;
1123         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
1124         struct tcon_link *tlink;
1125         struct cifs_tcon *tcon;
1126         struct TCP_Server_Info *server;
1127         struct iattr *attrs = NULL;
1128         __u32 dosattr = 0, origattr = 0;
1129
1130         cFYI(1, "cifs_unlink, dir=0x%p, dentry=0x%p", dir, dentry);
1131
1132         tlink = cifs_sb_tlink(cifs_sb);
1133         if (IS_ERR(tlink))
1134                 return PTR_ERR(tlink);
1135         tcon = tlink_tcon(tlink);
1136         server = tcon->ses->server;
1137
1138         xid = get_xid();
1139
1140         /* Unlink can be called from rename so we can not take the
1141          * sb->s_vfs_rename_mutex here */
1142         full_path = build_path_from_dentry(dentry);
1143         if (full_path == NULL) {
1144                 rc = -ENOMEM;
1145                 goto unlink_out;
1146         }
1147
1148         if (cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP &
1149                                 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
1150                 rc = CIFSPOSIXDelFile(xid, tcon, full_path,
1151                         SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls,
1152                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1153                 cFYI(1, "posix del rc %d", rc);
1154                 if ((rc == 0) || (rc == -ENOENT))
1155                         goto psx_del_no_retry;
1156         }
1157
1158 retry_std_delete:
1159         if (!server->ops->unlink) {
1160                 rc = -ENOSYS;
1161                 goto psx_del_no_retry;
1162         }
1163
1164         rc = server->ops->unlink(xid, tcon, full_path, cifs_sb);
1165
1166 psx_del_no_retry:
1167         if (!rc) {
1168                 if (inode)
1169                         cifs_drop_nlink(inode);
1170         } else if (rc == -ENOENT) {
1171                 d_drop(dentry);
1172         } else if (rc == -EBUSY) {
1173                 if (server->ops->rename_pending_delete) {
1174                         rc = server->ops->rename_pending_delete(full_path,
1175                                                                 dentry, xid);
1176                         if (rc == 0)
1177                                 cifs_drop_nlink(inode);
1178                 }
1179         } else if ((rc == -EACCES) && (dosattr == 0) && inode) {
1180                 attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
1181                 if (attrs == NULL) {
1182                         rc = -ENOMEM;
1183                         goto out_reval;
1184                 }
1185
1186                 /* try to reset dos attributes */
1187                 cifs_inode = CIFS_I(inode);
1188                 origattr = cifs_inode->cifsAttrs;
1189                 if (origattr == 0)
1190                         origattr |= ATTR_NORMAL;
1191                 dosattr = origattr & ~ATTR_READONLY;
1192                 if (dosattr == 0)
1193                         dosattr |= ATTR_NORMAL;
1194                 dosattr |= ATTR_HIDDEN;
1195
1196                 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
1197                 if (rc != 0)
1198                         goto out_reval;
1199
1200                 goto retry_std_delete;
1201         }
1202
1203         /* undo the setattr if we errored out and it's needed */
1204         if (rc != 0 && dosattr != 0)
1205                 cifs_set_file_info(inode, attrs, xid, full_path, origattr);
1206
1207 out_reval:
1208         if (inode) {
1209                 cifs_inode = CIFS_I(inode);
1210                 cifs_inode->time = 0;   /* will force revalidate to get info
1211                                            when needed */
1212                 inode->i_ctime = current_fs_time(sb);
1213         }
1214         dir->i_ctime = dir->i_mtime = current_fs_time(sb);
1215         cifs_inode = CIFS_I(dir);
1216         CIFS_I(dir)->time = 0;  /* force revalidate of dir as well */
1217 unlink_out:
1218         kfree(full_path);
1219         kfree(attrs);
1220         free_xid(xid);
1221         cifs_put_tlink(tlink);
1222         return rc;
1223 }
1224
1225 static int
1226 cifs_mkdir_qinfo(struct inode *parent, struct dentry *dentry, umode_t mode,
1227                  const char *full_path, struct cifs_sb_info *cifs_sb,
1228                  struct cifs_tcon *tcon, const unsigned int xid)
1229 {
1230         int rc = 0;
1231         struct inode *inode = NULL;
1232
1233         if (tcon->unix_ext)
1234                 rc = cifs_get_inode_info_unix(&inode, full_path, parent->i_sb,
1235                                               xid);
1236         else
1237                 rc = cifs_get_inode_info(&inode, full_path, NULL, parent->i_sb,
1238                                          xid, NULL);
1239
1240         if (rc)
1241                 return rc;
1242
1243         /*
1244          * setting nlink not necessary except in cases where we failed to get it
1245          * from the server or was set bogus. Also, since this is a brand new
1246          * inode, no need to grab the i_lock before setting the i_nlink.
1247          */
1248         if (inode->i_nlink < 2)
1249                 set_nlink(inode, 2);
1250         mode &= ~current_umask();
1251         /* must turn on setgid bit if parent dir has it */
1252         if (parent->i_mode & S_ISGID)
1253                 mode |= S_ISGID;
1254
1255         if (tcon->unix_ext) {
1256                 struct cifs_unix_set_info_args args = {
1257                         .mode   = mode,
1258                         .ctime  = NO_CHANGE_64,
1259                         .atime  = NO_CHANGE_64,
1260                         .mtime  = NO_CHANGE_64,
1261                         .device = 0,
1262                 };
1263                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1264                         args.uid = current_fsuid();
1265                         if (parent->i_mode & S_ISGID)
1266                                 args.gid = parent->i_gid;
1267                         else
1268                                 args.gid = current_fsgid();
1269                 } else {
1270                         args.uid = INVALID_UID; /* no change */
1271                         args.gid = INVALID_GID; /* no change */
1272                 }
1273                 CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args,
1274                                        cifs_sb->local_nls,
1275                                        cifs_sb->mnt_cifs_flags &
1276                                        CIFS_MOUNT_MAP_SPECIAL_CHR);
1277         } else {
1278                 struct TCP_Server_Info *server = tcon->ses->server;
1279                 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
1280                     (mode & S_IWUGO) == 0 && server->ops->mkdir_setinfo)
1281                         server->ops->mkdir_setinfo(inode, full_path, cifs_sb,
1282                                                    tcon, xid);
1283                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
1284                         inode->i_mode = (mode | S_IFDIR);
1285
1286                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1287                         inode->i_uid = current_fsuid();
1288                         if (inode->i_mode & S_ISGID)
1289                                 inode->i_gid = parent->i_gid;
1290                         else
1291                                 inode->i_gid = current_fsgid();
1292                 }
1293         }
1294         d_instantiate(dentry, inode);
1295         return rc;
1296 }
1297
1298 static int
1299 cifs_posix_mkdir(struct inode *inode, struct dentry *dentry, umode_t mode,
1300                  const char *full_path, struct cifs_sb_info *cifs_sb,
1301                  struct cifs_tcon *tcon, const unsigned int xid)
1302 {
1303         int rc = 0;
1304         u32 oplock = 0;
1305         FILE_UNIX_BASIC_INFO *info = NULL;
1306         struct inode *newinode = NULL;
1307         struct cifs_fattr fattr;
1308
1309         info = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
1310         if (info == NULL) {
1311                 rc = -ENOMEM;
1312                 goto posix_mkdir_out;
1313         }
1314
1315         mode &= ~current_umask();
1316         rc = CIFSPOSIXCreate(xid, tcon, SMB_O_DIRECTORY | SMB_O_CREAT, mode,
1317                              NULL /* netfid */, info, &oplock, full_path,
1318                              cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1319                              CIFS_MOUNT_MAP_SPECIAL_CHR);
1320         if (rc == -EOPNOTSUPP)
1321                 goto posix_mkdir_out;
1322         else if (rc) {
1323                 cFYI(1, "posix mkdir returned 0x%x", rc);
1324                 d_drop(dentry);
1325                 goto posix_mkdir_out;
1326         }
1327
1328         if (info->Type == cpu_to_le32(-1))
1329                 /* no return info, go query for it */
1330                 goto posix_mkdir_get_info;
1331         /*
1332          * BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if
1333          * need to set uid/gid.
1334          */
1335
1336         cifs_unix_basic_to_fattr(&fattr, info, cifs_sb);
1337         cifs_fill_uniqueid(inode->i_sb, &fattr);
1338         newinode = cifs_iget(inode->i_sb, &fattr);
1339         if (!newinode)
1340                 goto posix_mkdir_get_info;
1341
1342         d_instantiate(dentry, newinode);
1343
1344 #ifdef CONFIG_CIFS_DEBUG2
1345         cFYI(1, "instantiated dentry %p %s to inode %p", dentry,
1346              dentry->d_name.name, newinode);
1347
1348         if (newinode->i_nlink != 2)
1349                 cFYI(1, "unexpected number of links %d", newinode->i_nlink);
1350 #endif
1351
1352 posix_mkdir_out:
1353         kfree(info);
1354         return rc;
1355 posix_mkdir_get_info:
1356         rc = cifs_mkdir_qinfo(inode, dentry, mode, full_path, cifs_sb, tcon,
1357                               xid);
1358         goto posix_mkdir_out;
1359 }
1360
1361 int cifs_mkdir(struct inode *inode, struct dentry *direntry, umode_t mode)
1362 {
1363         int rc = 0;
1364         unsigned int xid;
1365         struct cifs_sb_info *cifs_sb;
1366         struct tcon_link *tlink;
1367         struct cifs_tcon *tcon;
1368         struct TCP_Server_Info *server;
1369         char *full_path;
1370
1371         cFYI(1, "In cifs_mkdir, mode = 0x%hx inode = 0x%p", mode, inode);
1372
1373         cifs_sb = CIFS_SB(inode->i_sb);
1374         tlink = cifs_sb_tlink(cifs_sb);
1375         if (IS_ERR(tlink))
1376                 return PTR_ERR(tlink);
1377         tcon = tlink_tcon(tlink);
1378
1379         xid = get_xid();
1380
1381         full_path = build_path_from_dentry(direntry);
1382         if (full_path == NULL) {
1383                 rc = -ENOMEM;
1384                 goto mkdir_out;
1385         }
1386
1387         if (cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP &
1388                                 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
1389                 rc = cifs_posix_mkdir(inode, direntry, mode, full_path, cifs_sb,
1390                                       tcon, xid);
1391                 if (rc != -EOPNOTSUPP)
1392                         goto mkdir_out;
1393         }
1394
1395         server = tcon->ses->server;
1396
1397         if (!server->ops->mkdir) {
1398                 rc = -ENOSYS;
1399                 goto mkdir_out;
1400         }
1401
1402         /* BB add setting the equivalent of mode via CreateX w/ACLs */
1403         rc = server->ops->mkdir(xid, tcon, full_path, cifs_sb);
1404         if (rc) {
1405                 cFYI(1, "cifs_mkdir returned 0x%x", rc);
1406                 d_drop(direntry);
1407                 goto mkdir_out;
1408         }
1409
1410         rc = cifs_mkdir_qinfo(inode, direntry, mode, full_path, cifs_sb, tcon,
1411                               xid);
1412 mkdir_out:
1413         /*
1414          * Force revalidate to get parent dir info when needed since cached
1415          * attributes are invalid now.
1416          */
1417         CIFS_I(inode)->time = 0;
1418         kfree(full_path);
1419         free_xid(xid);
1420         cifs_put_tlink(tlink);
1421         return rc;
1422 }
1423
1424 int cifs_rmdir(struct inode *inode, struct dentry *direntry)
1425 {
1426         int rc = 0;
1427         unsigned int xid;
1428         struct cifs_sb_info *cifs_sb;
1429         struct tcon_link *tlink;
1430         struct cifs_tcon *tcon;
1431         struct TCP_Server_Info *server;
1432         char *full_path = NULL;
1433         struct cifsInodeInfo *cifsInode;
1434
1435         cFYI(1, "cifs_rmdir, inode = 0x%p", inode);
1436
1437         xid = get_xid();
1438
1439         full_path = build_path_from_dentry(direntry);
1440         if (full_path == NULL) {
1441                 rc = -ENOMEM;
1442                 goto rmdir_exit;
1443         }
1444
1445         cifs_sb = CIFS_SB(inode->i_sb);
1446         tlink = cifs_sb_tlink(cifs_sb);
1447         if (IS_ERR(tlink)) {
1448                 rc = PTR_ERR(tlink);
1449                 goto rmdir_exit;
1450         }
1451         tcon = tlink_tcon(tlink);
1452         server = tcon->ses->server;
1453
1454         if (!server->ops->rmdir) {
1455                 rc = -ENOSYS;
1456                 cifs_put_tlink(tlink);
1457                 goto rmdir_exit;
1458         }
1459
1460         rc = server->ops->rmdir(xid, tcon, full_path, cifs_sb);
1461         cifs_put_tlink(tlink);
1462
1463         if (!rc) {
1464                 spin_lock(&direntry->d_inode->i_lock);
1465                 i_size_write(direntry->d_inode, 0);
1466                 clear_nlink(direntry->d_inode);
1467                 spin_unlock(&direntry->d_inode->i_lock);
1468         }
1469
1470         cifsInode = CIFS_I(direntry->d_inode);
1471         /* force revalidate to go get info when needed */
1472         cifsInode->time = 0;
1473
1474         cifsInode = CIFS_I(inode);
1475         /*
1476          * Force revalidate to get parent dir info when needed since cached
1477          * attributes are invalid now.
1478          */
1479         cifsInode->time = 0;
1480
1481         direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
1482                 current_fs_time(inode->i_sb);
1483
1484 rmdir_exit:
1485         kfree(full_path);
1486         free_xid(xid);
1487         return rc;
1488 }
1489
1490 static int
1491 cifs_do_rename(const unsigned int xid, struct dentry *from_dentry,
1492                const char *from_path, struct dentry *to_dentry,
1493                const char *to_path)
1494 {
1495         struct cifs_sb_info *cifs_sb = CIFS_SB(from_dentry->d_sb);
1496         struct tcon_link *tlink;
1497         struct cifs_tcon *tcon;
1498         struct TCP_Server_Info *server;
1499         __u16 srcfid;
1500         int oplock, rc;
1501
1502         tlink = cifs_sb_tlink(cifs_sb);
1503         if (IS_ERR(tlink))
1504                 return PTR_ERR(tlink);
1505         tcon = tlink_tcon(tlink);
1506         server = tcon->ses->server;
1507
1508         if (!server->ops->rename)
1509                 return -ENOSYS;
1510
1511         /* try path-based rename first */
1512         rc = server->ops->rename(xid, tcon, from_path, to_path, cifs_sb);
1513
1514         /*
1515          * Don't bother with rename by filehandle unless file is busy and
1516          * source. Note that cross directory moves do not work with
1517          * rename by filehandle to various Windows servers.
1518          */
1519         if (rc == 0 || rc != -EBUSY)
1520                 goto do_rename_exit;
1521
1522         /* open-file renames don't work across directories */
1523         if (to_dentry->d_parent != from_dentry->d_parent)
1524                 goto do_rename_exit;
1525
1526         /* open the file to be renamed -- we need DELETE perms */
1527         rc = CIFSSMBOpen(xid, tcon, from_path, FILE_OPEN, DELETE,
1528                          CREATE_NOT_DIR, &srcfid, &oplock, NULL,
1529                          cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1530                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1531         if (rc == 0) {
1532                 rc = CIFSSMBRenameOpenFile(xid, tcon, srcfid,
1533                                 (const char *) to_dentry->d_name.name,
1534                                 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1535                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1536                 CIFSSMBClose(xid, tcon, srcfid);
1537         }
1538 do_rename_exit:
1539         cifs_put_tlink(tlink);
1540         return rc;
1541 }
1542
1543 int
1544 cifs_rename(struct inode *source_dir, struct dentry *source_dentry,
1545             struct inode *target_dir, struct dentry *target_dentry)
1546 {
1547         char *from_name = NULL;
1548         char *to_name = NULL;
1549         struct cifs_sb_info *cifs_sb;
1550         struct tcon_link *tlink;
1551         struct cifs_tcon *tcon;
1552         FILE_UNIX_BASIC_INFO *info_buf_source = NULL;
1553         FILE_UNIX_BASIC_INFO *info_buf_target;
1554         unsigned int xid;
1555         int rc, tmprc;
1556
1557         cifs_sb = CIFS_SB(source_dir->i_sb);
1558         tlink = cifs_sb_tlink(cifs_sb);
1559         if (IS_ERR(tlink))
1560                 return PTR_ERR(tlink);
1561         tcon = tlink_tcon(tlink);
1562
1563         xid = get_xid();
1564
1565         /*
1566          * we already have the rename sem so we do not need to
1567          * grab it again here to protect the path integrity
1568          */
1569         from_name = build_path_from_dentry(source_dentry);
1570         if (from_name == NULL) {
1571                 rc = -ENOMEM;
1572                 goto cifs_rename_exit;
1573         }
1574
1575         to_name = build_path_from_dentry(target_dentry);
1576         if (to_name == NULL) {
1577                 rc = -ENOMEM;
1578                 goto cifs_rename_exit;
1579         }
1580
1581         rc = cifs_do_rename(xid, source_dentry, from_name, target_dentry,
1582                             to_name);
1583
1584         if (rc == -EEXIST && tcon->unix_ext) {
1585                 /*
1586                  * Are src and dst hardlinks of same inode? We can only tell
1587                  * with unix extensions enabled.
1588                  */
1589                 info_buf_source =
1590                         kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO),
1591                                         GFP_KERNEL);
1592                 if (info_buf_source == NULL) {
1593                         rc = -ENOMEM;
1594                         goto cifs_rename_exit;
1595                 }
1596
1597                 info_buf_target = info_buf_source + 1;
1598                 tmprc = CIFSSMBUnixQPathInfo(xid, tcon, from_name,
1599                                              info_buf_source,
1600                                              cifs_sb->local_nls,
1601                                              cifs_sb->mnt_cifs_flags &
1602                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1603                 if (tmprc != 0)
1604                         goto unlink_target;
1605
1606                 tmprc = CIFSSMBUnixQPathInfo(xid, tcon, to_name,
1607                                              info_buf_target,
1608                                              cifs_sb->local_nls,
1609                                              cifs_sb->mnt_cifs_flags &
1610                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1611
1612                 if (tmprc == 0 && (info_buf_source->UniqueId ==
1613                                    info_buf_target->UniqueId)) {
1614                         /* same file, POSIX says that this is a noop */
1615                         rc = 0;
1616                         goto cifs_rename_exit;
1617                 }
1618         }
1619         /*
1620          * else ... BB we could add the same check for Windows by
1621          * checking the UniqueId via FILE_INTERNAL_INFO
1622          */
1623
1624 unlink_target:
1625         /* Try unlinking the target dentry if it's not negative */
1626         if (target_dentry->d_inode && (rc == -EACCES || rc == -EEXIST)) {
1627                 tmprc = cifs_unlink(target_dir, target_dentry);
1628                 if (tmprc)
1629                         goto cifs_rename_exit;
1630                 rc = cifs_do_rename(xid, source_dentry, from_name,
1631                                     target_dentry, to_name);
1632         }
1633
1634 cifs_rename_exit:
1635         kfree(info_buf_source);
1636         kfree(from_name);
1637         kfree(to_name);
1638         free_xid(xid);
1639         cifs_put_tlink(tlink);
1640         return rc;
1641 }
1642
1643 static bool
1644 cifs_inode_needs_reval(struct inode *inode)
1645 {
1646         struct cifsInodeInfo *cifs_i = CIFS_I(inode);
1647         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1648
1649         if (cifs_i->clientCanCacheRead)
1650                 return false;
1651
1652         if (!lookupCacheEnabled)
1653                 return true;
1654
1655         if (cifs_i->time == 0)
1656                 return true;
1657
1658         if (!time_in_range(jiffies, cifs_i->time,
1659                                 cifs_i->time + cifs_sb->actimeo))
1660                 return true;
1661
1662         /* hardlinked files w/ noserverino get "special" treatment */
1663         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) &&
1664             S_ISREG(inode->i_mode) && inode->i_nlink != 1)
1665                 return true;
1666
1667         return false;
1668 }
1669
1670 /*
1671  * Zap the cache. Called when invalid_mapping flag is set.
1672  */
1673 int
1674 cifs_invalidate_mapping(struct inode *inode)
1675 {
1676         int rc = 0;
1677         struct cifsInodeInfo *cifs_i = CIFS_I(inode);
1678
1679         cifs_i->invalid_mapping = false;
1680
1681         if (inode->i_mapping && inode->i_mapping->nrpages != 0) {
1682                 rc = invalidate_inode_pages2(inode->i_mapping);
1683                 if (rc) {
1684                         cERROR(1, "%s: could not invalidate inode %p", __func__,
1685                                inode);
1686                         cifs_i->invalid_mapping = true;
1687                 }
1688         }
1689
1690         cifs_fscache_reset_inode_cookie(inode);
1691         return rc;
1692 }
1693
1694 int cifs_revalidate_file_attr(struct file *filp)
1695 {
1696         int rc = 0;
1697         struct inode *inode = file_inode(filp);
1698         struct cifsFileInfo *cfile = (struct cifsFileInfo *) filp->private_data;
1699
1700         if (!cifs_inode_needs_reval(inode))
1701                 return rc;
1702
1703         if (tlink_tcon(cfile->tlink)->unix_ext)
1704                 rc = cifs_get_file_info_unix(filp);
1705         else
1706                 rc = cifs_get_file_info(filp);
1707
1708         return rc;
1709 }
1710
1711 int cifs_revalidate_dentry_attr(struct dentry *dentry)
1712 {
1713         unsigned int xid;
1714         int rc = 0;
1715         struct inode *inode = dentry->d_inode;
1716         struct super_block *sb = dentry->d_sb;
1717         char *full_path = NULL;
1718
1719         if (inode == NULL)
1720                 return -ENOENT;
1721
1722         if (!cifs_inode_needs_reval(inode))
1723                 return rc;
1724
1725         xid = get_xid();
1726
1727         /* can not safely grab the rename sem here if rename calls revalidate
1728            since that would deadlock */
1729         full_path = build_path_from_dentry(dentry);
1730         if (full_path == NULL) {
1731                 rc = -ENOMEM;
1732                 goto out;
1733         }
1734
1735         cFYI(1, "Update attributes: %s inode 0x%p count %d dentry: 0x%p d_time "
1736                  "%ld jiffies %ld", full_path, inode, inode->i_count.counter,
1737                  dentry, dentry->d_time, jiffies);
1738
1739         if (cifs_sb_master_tcon(CIFS_SB(sb))->unix_ext)
1740                 rc = cifs_get_inode_info_unix(&inode, full_path, sb, xid);
1741         else
1742                 rc = cifs_get_inode_info(&inode, full_path, NULL, sb,
1743                                          xid, NULL);
1744
1745 out:
1746         kfree(full_path);
1747         free_xid(xid);
1748         return rc;
1749 }
1750
1751 int cifs_revalidate_file(struct file *filp)
1752 {
1753         int rc;
1754         struct inode *inode = file_inode(filp);
1755
1756         rc = cifs_revalidate_file_attr(filp);
1757         if (rc)
1758                 return rc;
1759
1760         if (CIFS_I(inode)->invalid_mapping)
1761                 rc = cifs_invalidate_mapping(inode);
1762         return rc;
1763 }
1764
1765 /* revalidate a dentry's inode attributes */
1766 int cifs_revalidate_dentry(struct dentry *dentry)
1767 {
1768         int rc;
1769         struct inode *inode = dentry->d_inode;
1770
1771         rc = cifs_revalidate_dentry_attr(dentry);
1772         if (rc)
1773                 return rc;
1774
1775         if (CIFS_I(inode)->invalid_mapping)
1776                 rc = cifs_invalidate_mapping(inode);
1777         return rc;
1778 }
1779
1780 int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1781                  struct kstat *stat)
1782 {
1783         struct cifs_sb_info *cifs_sb = CIFS_SB(dentry->d_sb);
1784         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
1785         struct inode *inode = dentry->d_inode;
1786         int rc;
1787
1788         /*
1789          * We need to be sure that all dirty pages are written and the server
1790          * has actual ctime, mtime and file length.
1791          */
1792         if (!CIFS_I(inode)->clientCanCacheRead && inode->i_mapping &&
1793             inode->i_mapping->nrpages != 0) {
1794                 rc = filemap_fdatawait(inode->i_mapping);
1795                 if (rc) {
1796                         mapping_set_error(inode->i_mapping, rc);
1797                         return rc;
1798                 }
1799         }
1800
1801         rc = cifs_revalidate_dentry_attr(dentry);
1802         if (rc)
1803                 return rc;
1804
1805         generic_fillattr(inode, stat);
1806         stat->blksize = CIFS_MAX_MSGSIZE;
1807         stat->ino = CIFS_I(inode)->uniqueid;
1808
1809         /*
1810          * If on a multiuser mount without unix extensions or cifsacl being
1811          * enabled, and the admin hasn't overridden them, set the ownership
1812          * to the fsuid/fsgid of the current process.
1813          */
1814         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER) &&
1815             !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
1816             !tcon->unix_ext) {
1817                 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID))
1818                         stat->uid = current_fsuid();
1819                 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID))
1820                         stat->gid = current_fsgid();
1821         }
1822         return rc;
1823 }
1824
1825 static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1826 {
1827         pgoff_t index = from >> PAGE_CACHE_SHIFT;
1828         unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1829         struct page *page;
1830         int rc = 0;
1831
1832         page = grab_cache_page(mapping, index);
1833         if (!page)
1834                 return -ENOMEM;
1835
1836         zero_user_segment(page, offset, PAGE_CACHE_SIZE);
1837         unlock_page(page);
1838         page_cache_release(page);
1839         return rc;
1840 }
1841
1842 static void cifs_setsize(struct inode *inode, loff_t offset)
1843 {
1844         loff_t oldsize;
1845
1846         spin_lock(&inode->i_lock);
1847         oldsize = inode->i_size;
1848         i_size_write(inode, offset);
1849         spin_unlock(&inode->i_lock);
1850
1851         truncate_pagecache(inode, oldsize, offset);
1852 }
1853
1854 static int
1855 cifs_set_file_size(struct inode *inode, struct iattr *attrs,
1856                    unsigned int xid, char *full_path)
1857 {
1858         int rc;
1859         struct cifsFileInfo *open_file;
1860         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1861         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1862         struct tcon_link *tlink = NULL;
1863         struct cifs_tcon *tcon = NULL;
1864         struct TCP_Server_Info *server;
1865         struct cifs_io_parms io_parms;
1866
1867         /*
1868          * To avoid spurious oplock breaks from server, in the case of
1869          * inodes that we already have open, avoid doing path based
1870          * setting of file size if we can do it by handle.
1871          * This keeps our caching token (oplock) and avoids timeouts
1872          * when the local oplock break takes longer to flush
1873          * writebehind data than the SMB timeout for the SetPathInfo
1874          * request would allow
1875          */
1876         open_file = find_writable_file(cifsInode, true);
1877         if (open_file) {
1878                 tcon = tlink_tcon(open_file->tlink);
1879                 server = tcon->ses->server;
1880                 if (server->ops->set_file_size)
1881                         rc = server->ops->set_file_size(xid, tcon, open_file,
1882                                                         attrs->ia_size, false);
1883                 else
1884                         rc = -ENOSYS;
1885                 cifsFileInfo_put(open_file);
1886                 cFYI(1, "SetFSize for attrs rc = %d", rc);
1887                 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1888                         unsigned int bytes_written;
1889
1890                         io_parms.netfid = open_file->fid.netfid;
1891                         io_parms.pid = open_file->pid;
1892                         io_parms.tcon = tcon;
1893                         io_parms.offset = 0;
1894                         io_parms.length = attrs->ia_size;
1895                         rc = CIFSSMBWrite(xid, &io_parms, &bytes_written,
1896                                           NULL, NULL, 1);
1897                         cFYI(1, "Wrt seteof rc %d", rc);
1898                 }
1899         } else
1900                 rc = -EINVAL;
1901
1902         if (!rc)
1903                 goto set_size_out;
1904
1905         if (tcon == NULL) {
1906                 tlink = cifs_sb_tlink(cifs_sb);
1907                 if (IS_ERR(tlink))
1908                         return PTR_ERR(tlink);
1909                 tcon = tlink_tcon(tlink);
1910                 server = tcon->ses->server;
1911         }
1912
1913         /*
1914          * Set file size by pathname rather than by handle either because no
1915          * valid, writeable file handle for it was found or because there was
1916          * an error setting it by handle.
1917          */
1918         if (server->ops->set_path_size)
1919                 rc = server->ops->set_path_size(xid, tcon, full_path,
1920                                                 attrs->ia_size, cifs_sb, false);
1921         else
1922                 rc = -ENOSYS;
1923         cFYI(1, "SetEOF by path (setattrs) rc = %d", rc);
1924         if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1925                 __u16 netfid;
1926                 int oplock = 0;
1927
1928                 rc = SMBLegacyOpen(xid, tcon, full_path, FILE_OPEN,
1929                                    GENERIC_WRITE, CREATE_NOT_DIR, &netfid,
1930                                    &oplock, NULL, cifs_sb->local_nls,
1931                                    cifs_sb->mnt_cifs_flags &
1932                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1933                 if (rc == 0) {
1934                         unsigned int bytes_written;
1935
1936                         io_parms.netfid = netfid;
1937                         io_parms.pid = current->tgid;
1938                         io_parms.tcon = tcon;
1939                         io_parms.offset = 0;
1940                         io_parms.length = attrs->ia_size;
1941                         rc = CIFSSMBWrite(xid, &io_parms, &bytes_written, NULL,
1942                                           NULL,  1);
1943                         cFYI(1, "wrt seteof rc %d", rc);
1944                         CIFSSMBClose(xid, tcon, netfid);
1945                 }
1946         }
1947         if (tlink)
1948                 cifs_put_tlink(tlink);
1949
1950 set_size_out:
1951         if (rc == 0) {
1952                 cifsInode->server_eof = attrs->ia_size;
1953                 cifs_setsize(inode, attrs->ia_size);
1954                 cifs_truncate_page(inode->i_mapping, inode->i_size);
1955         }
1956
1957         return rc;
1958 }
1959
1960 static int
1961 cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
1962 {
1963         int rc;
1964         unsigned int xid;
1965         char *full_path = NULL;
1966         struct inode *inode = direntry->d_inode;
1967         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1968         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1969         struct tcon_link *tlink;
1970         struct cifs_tcon *pTcon;
1971         struct cifs_unix_set_info_args *args = NULL;
1972         struct cifsFileInfo *open_file;
1973
1974         cFYI(1, "setattr_unix on file %s attrs->ia_valid=0x%x",
1975                  direntry->d_name.name, attrs->ia_valid);
1976
1977         xid = get_xid();
1978
1979         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
1980                 attrs->ia_valid |= ATTR_FORCE;
1981
1982         rc = inode_change_ok(inode, attrs);
1983         if (rc < 0)
1984                 goto out;
1985
1986         full_path = build_path_from_dentry(direntry);
1987         if (full_path == NULL) {
1988                 rc = -ENOMEM;
1989                 goto out;
1990         }
1991
1992         /*
1993          * Attempt to flush data before changing attributes. We need to do
1994          * this for ATTR_SIZE and ATTR_MTIME for sure, and if we change the
1995          * ownership or mode then we may also need to do this. Here, we take
1996          * the safe way out and just do the flush on all setattr requests. If
1997          * the flush returns error, store it to report later and continue.
1998          *
1999          * BB: This should be smarter. Why bother flushing pages that
2000          * will be truncated anyway? Also, should we error out here if
2001          * the flush returns error?
2002          */
2003         rc = filemap_write_and_wait(inode->i_mapping);
2004         mapping_set_error(inode->i_mapping, rc);
2005         rc = 0;
2006
2007         if (attrs->ia_valid & ATTR_SIZE) {
2008                 rc = cifs_set_file_size(inode, attrs, xid, full_path);
2009                 if (rc != 0)
2010                         goto out;
2011         }
2012
2013         /* skip mode change if it's just for clearing setuid/setgid */
2014         if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
2015                 attrs->ia_valid &= ~ATTR_MODE;
2016
2017         args = kmalloc(sizeof(*args), GFP_KERNEL);
2018         if (args == NULL) {
2019                 rc = -ENOMEM;
2020                 goto out;
2021         }
2022
2023         /* set up the struct */
2024         if (attrs->ia_valid & ATTR_MODE)
2025                 args->mode = attrs->ia_mode;
2026         else
2027                 args->mode = NO_CHANGE_64;
2028
2029         if (attrs->ia_valid & ATTR_UID)
2030                 args->uid = attrs->ia_uid;
2031         else
2032                 args->uid = INVALID_UID; /* no change */
2033
2034         if (attrs->ia_valid & ATTR_GID)
2035                 args->gid = attrs->ia_gid;
2036         else
2037                 args->gid = INVALID_GID; /* no change */
2038
2039         if (attrs->ia_valid & ATTR_ATIME)
2040                 args->atime = cifs_UnixTimeToNT(attrs->ia_atime);
2041         else
2042                 args->atime = NO_CHANGE_64;
2043
2044         if (attrs->ia_valid & ATTR_MTIME)
2045                 args->mtime = cifs_UnixTimeToNT(attrs->ia_mtime);
2046         else
2047                 args->mtime = NO_CHANGE_64;
2048
2049         if (attrs->ia_valid & ATTR_CTIME)
2050                 args->ctime = cifs_UnixTimeToNT(attrs->ia_ctime);
2051         else
2052                 args->ctime = NO_CHANGE_64;
2053
2054         args->device = 0;
2055         open_file = find_writable_file(cifsInode, true);
2056         if (open_file) {
2057                 u16 nfid = open_file->fid.netfid;
2058                 u32 npid = open_file->pid;
2059                 pTcon = tlink_tcon(open_file->tlink);
2060                 rc = CIFSSMBUnixSetFileInfo(xid, pTcon, args, nfid, npid);
2061                 cifsFileInfo_put(open_file);
2062         } else {
2063                 tlink = cifs_sb_tlink(cifs_sb);
2064                 if (IS_ERR(tlink)) {
2065                         rc = PTR_ERR(tlink);
2066                         goto out;
2067                 }
2068                 pTcon = tlink_tcon(tlink);
2069                 rc = CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, args,
2070                                     cifs_sb->local_nls,
2071                                     cifs_sb->mnt_cifs_flags &
2072                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
2073                 cifs_put_tlink(tlink);
2074         }
2075
2076         if (rc)
2077                 goto out;
2078
2079         if ((attrs->ia_valid & ATTR_SIZE) &&
2080             attrs->ia_size != i_size_read(inode))
2081                 truncate_setsize(inode, attrs->ia_size);
2082
2083         setattr_copy(inode, attrs);
2084         mark_inode_dirty(inode);
2085
2086         /* force revalidate when any of these times are set since some
2087            of the fs types (eg ext3, fat) do not have fine enough
2088            time granularity to match protocol, and we do not have a
2089            a way (yet) to query the server fs's time granularity (and
2090            whether it rounds times down).
2091         */
2092         if (attrs->ia_valid & (ATTR_MTIME | ATTR_CTIME))
2093                 cifsInode->time = 0;
2094 out:
2095         kfree(args);
2096         kfree(full_path);
2097         free_xid(xid);
2098         return rc;
2099 }
2100
2101 static int
2102 cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
2103 {
2104         unsigned int xid;
2105         kuid_t uid = INVALID_UID;
2106         kgid_t gid = INVALID_GID;
2107         struct inode *inode = direntry->d_inode;
2108         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2109         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
2110         char *full_path = NULL;
2111         int rc = -EACCES;
2112         __u32 dosattr = 0;
2113         __u64 mode = NO_CHANGE_64;
2114
2115         xid = get_xid();
2116
2117         cFYI(1, "setattr on file %s attrs->iavalid 0x%x",
2118                  direntry->d_name.name, attrs->ia_valid);
2119
2120         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
2121                 attrs->ia_valid |= ATTR_FORCE;
2122
2123         rc = inode_change_ok(inode, attrs);
2124         if (rc < 0) {
2125                 free_xid(xid);
2126                 return rc;
2127         }
2128
2129         full_path = build_path_from_dentry(direntry);
2130         if (full_path == NULL) {
2131                 rc = -ENOMEM;
2132                 free_xid(xid);
2133                 return rc;
2134         }
2135
2136         /*
2137          * Attempt to flush data before changing attributes. We need to do
2138          * this for ATTR_SIZE and ATTR_MTIME for sure, and if we change the
2139          * ownership or mode then we may also need to do this. Here, we take
2140          * the safe way out and just do the flush on all setattr requests. If
2141          * the flush returns error, store it to report later and continue.
2142          *
2143          * BB: This should be smarter. Why bother flushing pages that
2144          * will be truncated anyway? Also, should we error out here if
2145          * the flush returns error?
2146          */
2147         rc = filemap_write_and_wait(inode->i_mapping);
2148         mapping_set_error(inode->i_mapping, rc);
2149         rc = 0;
2150
2151         if (attrs->ia_valid & ATTR_SIZE) {
2152                 rc = cifs_set_file_size(inode, attrs, xid, full_path);
2153                 if (rc != 0)
2154                         goto cifs_setattr_exit;
2155         }
2156
2157         if (attrs->ia_valid & ATTR_UID)
2158                 uid = attrs->ia_uid;
2159
2160         if (attrs->ia_valid & ATTR_GID)
2161                 gid = attrs->ia_gid;
2162
2163 #ifdef CONFIG_CIFS_ACL
2164         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
2165                 if (uid_valid(uid) || gid_valid(gid)) {
2166                         rc = id_mode_to_cifs_acl(inode, full_path, NO_CHANGE_64,
2167                                                         uid, gid);
2168                         if (rc) {
2169                                 cFYI(1, "%s: Setting id failed with error: %d",
2170                                         __func__, rc);
2171                                 goto cifs_setattr_exit;
2172                         }
2173                 }
2174         } else
2175 #endif /* CONFIG_CIFS_ACL */
2176         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID))
2177                 attrs->ia_valid &= ~(ATTR_UID | ATTR_GID);
2178
2179         /* skip mode change if it's just for clearing setuid/setgid */
2180         if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
2181                 attrs->ia_valid &= ~ATTR_MODE;
2182
2183         if (attrs->ia_valid & ATTR_MODE) {
2184                 mode = attrs->ia_mode;
2185                 rc = 0;
2186 #ifdef CONFIG_CIFS_ACL
2187                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
2188                         rc = id_mode_to_cifs_acl(inode, full_path, mode,
2189                                                 INVALID_UID, INVALID_GID);
2190                         if (rc) {
2191                                 cFYI(1, "%s: Setting ACL failed with error: %d",
2192                                         __func__, rc);
2193                                 goto cifs_setattr_exit;
2194                         }
2195                 } else
2196 #endif /* CONFIG_CIFS_ACL */
2197                 if (((mode & S_IWUGO) == 0) &&
2198                     (cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
2199
2200                         dosattr = cifsInode->cifsAttrs | ATTR_READONLY;
2201
2202                         /* fix up mode if we're not using dynperm */
2203                         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
2204                                 attrs->ia_mode = inode->i_mode & ~S_IWUGO;
2205                 } else if ((mode & S_IWUGO) &&
2206                            (cifsInode->cifsAttrs & ATTR_READONLY)) {
2207
2208                         dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
2209                         /* Attributes of 0 are ignored */
2210                         if (dosattr == 0)
2211                                 dosattr |= ATTR_NORMAL;
2212
2213                         /* reset local inode permissions to normal */
2214                         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
2215                                 attrs->ia_mode &= ~(S_IALLUGO);
2216                                 if (S_ISDIR(inode->i_mode))
2217                                         attrs->ia_mode |=
2218                                                 cifs_sb->mnt_dir_mode;
2219                                 else
2220                                         attrs->ia_mode |=
2221                                                 cifs_sb->mnt_file_mode;
2222                         }
2223                 } else if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
2224                         /* ignore mode change - ATTR_READONLY hasn't changed */
2225                         attrs->ia_valid &= ~ATTR_MODE;
2226                 }
2227         }
2228
2229         if (attrs->ia_valid & (ATTR_MTIME|ATTR_ATIME|ATTR_CTIME) ||
2230             ((attrs->ia_valid & ATTR_MODE) && dosattr)) {
2231                 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
2232                 /* BB: check for rc = -EOPNOTSUPP and switch to legacy mode */
2233
2234                 /* Even if error on time set, no sense failing the call if
2235                 the server would set the time to a reasonable value anyway,
2236                 and this check ensures that we are not being called from
2237                 sys_utimes in which case we ought to fail the call back to
2238                 the user when the server rejects the call */
2239                 if ((rc) && (attrs->ia_valid &
2240                                 (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
2241                         rc = 0;
2242         }
2243
2244         /* do not need local check to inode_check_ok since the server does
2245            that */
2246         if (rc)
2247                 goto cifs_setattr_exit;
2248
2249         if ((attrs->ia_valid & ATTR_SIZE) &&
2250             attrs->ia_size != i_size_read(inode))
2251                 truncate_setsize(inode, attrs->ia_size);
2252
2253         setattr_copy(inode, attrs);
2254         mark_inode_dirty(inode);
2255
2256 cifs_setattr_exit:
2257         kfree(full_path);
2258         free_xid(xid);
2259         return rc;
2260 }
2261
2262 int
2263 cifs_setattr(struct dentry *direntry, struct iattr *attrs)
2264 {
2265         struct inode *inode = direntry->d_inode;
2266         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2267         struct cifs_tcon *pTcon = cifs_sb_master_tcon(cifs_sb);
2268
2269         if (pTcon->unix_ext)
2270                 return cifs_setattr_unix(direntry, attrs);
2271
2272         return cifs_setattr_nounix(direntry, attrs);
2273
2274         /* BB: add cifs_setattr_legacy for really old servers */
2275 }
2276
2277 #if 0
2278 void cifs_delete_inode(struct inode *inode)
2279 {
2280         cFYI(1, "In cifs_delete_inode, inode = 0x%p", inode);
2281         /* may have to add back in if and when safe distributed caching of
2282            directories added e.g. via FindNotify */
2283 }
2284 #endif