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         unsigned long oldtime = cifs_i->time;
 128
 129         cifs_revalidate_cache(inode, fattr);
 130
 131         inode->i_atime = fattr->cf_atime;
 132         inode->i_mtime = fattr->cf_mtime;
 133         inode->i_ctime = fattr->cf_ctime;
 134         inode->i_rdev = fattr->cf_rdev;
 135         set_nlink(inode, fattr->cf_nlink);
 136         inode->i_uid = fattr->cf_uid;
 137         inode->i_gid = fattr->cf_gid;
 138
 139         /* if dynperm is set, don't clobber existing mode */
 140         if (inode->i_state & I_NEW ||
 141             !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM))
 142                 inode->i_mode = fattr->cf_mode;
 143
 144         cifs_i->cifsAttrs = fattr->cf_cifsattrs;
 145
 146         if (fattr->cf_flags & CIFS_FATTR_NEED_REVAL)
 147                 cifs_i->time = 0;
 148         else
 149                 cifs_i->time = jiffies;
 150
 151         cFYI(1, "inode 0x%p old_time=%ld new_time=%ld", inode,
 152                  oldtime, cifs_i->time);
 153
 154         cifs_i->delete_pending = fattr->cf_flags & CIFS_FATTR_DELETE_PENDING;
 155
 156         cifs_i->server_eof = fattr->cf_eof;
 157         /*
 158          * Can't safely change the file size here if the client is writing to
 159          * it due to potential races.
 160          */
 161         spin_lock(&inode->i_lock);
 162         if (is_size_safe_to_change(cifs_i, fattr->cf_eof)) {
 163                 i_size_write(inode, fattr->cf_eof);
 164
 165                 /*
 166                  * i_blocks is not related to (i_size / i_blksize),
 167                  * but instead 512 byte (2**9) size is required for
 168                  * calculating num blocks.
 169                  */
 170                 inode->i_blocks = (512 - 1 + fattr->cf_bytes) >> 9;
 171         }
 172         spin_unlock(&inode->i_lock);
 173
 174         if (fattr->cf_flags & CIFS_FATTR_DFS_REFERRAL)
 175                 inode->i_flags |= S_AUTOMOUNT;
 176         cifs_set_ops(inode);
 177 }
 178
 179 void
 180 cifs_fill_uniqueid(struct super_block *sb, struct cifs_fattr *fattr)
 181 {
 182         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 183
 184         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 185                 return;
 186
 187         fattr->cf_uniqueid = iunique(sb, ROOT_I);
 188 }
 189
 190 /* Fill a cifs_fattr struct with info from FILE_UNIX_BASIC_INFO. */
 191 void
 192 cifs_unix_basic_to_fattr(struct cifs_fattr *fattr, FILE_UNIX_BASIC_INFO *info,
 193                          struct cifs_sb_info *cifs_sb)
 194 {
 195         memset(fattr, 0, sizeof(*fattr));
 196         fattr->cf_uniqueid = le64_to_cpu(info->UniqueId);
 197         fattr->cf_bytes = le64_to_cpu(info->NumOfBytes);
 198         fattr->cf_eof = le64_to_cpu(info->EndOfFile);
 199
 200         fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
 201         fattr->cf_mtime = cifs_NTtimeToUnix(info->LastModificationTime);
 202         fattr->cf_ctime = cifs_NTtimeToUnix(info->LastStatusChange);
 203         fattr->cf_mode = le64_to_cpu(info->Permissions);
 204
 205         /*
 206          * Since we set the inode type below we need to mask off
 207          * to avoid strange results if bits set above.
 208          */
 209         fattr->cf_mode &= ~S_IFMT;
 210         switch (le32_to_cpu(info->Type)) {
 211         case UNIX_FILE:
 212                 fattr->cf_mode |= S_IFREG;
 213                 fattr->cf_dtype = DT_REG;
 214                 break;
 215         case UNIX_SYMLINK:
 216                 fattr->cf_mode |= S_IFLNK;
 217                 fattr->cf_dtype = DT_LNK;
 218                 break;
 219         case UNIX_DIR:
 220                 fattr->cf_mode |= S_IFDIR;
 221                 fattr->cf_dtype = DT_DIR;
 222                 break;
 223         case UNIX_CHARDEV:
 224                 fattr->cf_mode |= S_IFCHR;
 225                 fattr->cf_dtype = DT_CHR;
 226                 fattr->cf_rdev = MKDEV(le64_to_cpu(info->DevMajor),
 227                                        le64_to_cpu(info->DevMinor) & MINORMASK);
 228                 break;
 229         case UNIX_BLOCKDEV:
 230                 fattr->cf_mode |= S_IFBLK;
 231                 fattr->cf_dtype = DT_BLK;
 232                 fattr->cf_rdev = MKDEV(le64_to_cpu(info->DevMajor),
 233                                        le64_to_cpu(info->DevMinor) & MINORMASK);
 234                 break;
 235         case UNIX_FIFO:
 236                 fattr->cf_mode |= S_IFIFO;
 237                 fattr->cf_dtype = DT_FIFO;
 238                 break;
 239         case UNIX_SOCKET:
 240                 fattr->cf_mode |= S_IFSOCK;
 241                 fattr->cf_dtype = DT_SOCK;
 242                 break;
 243         default:
 244                 /* safest to call it a file if we do not know */
 245                 fattr->cf_mode |= S_IFREG;
 246                 fattr->cf_dtype = DT_REG;
 247                 cFYI(1, "unknown type %d", le32_to_cpu(info->Type));
 248                 break;
 249         }
 250
 251         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
 252                 fattr->cf_uid = cifs_sb->mnt_uid;
 253         else
 254                 fattr->cf_uid = le64_to_cpu(info->Uid);
 255
 256         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
 257                 fattr->cf_gid = cifs_sb->mnt_gid;
 258         else
 259                 fattr->cf_gid = le64_to_cpu(info->Gid);
 260
 261         fattr->cf_nlink = le64_to_cpu(info->Nlinks);
 262 }
 263
 264 /*
 265  * Fill a cifs_fattr struct with fake inode info.
 266  *
 267  * Needed to setup cifs_fattr data for the directory which is the
 268  * junction to the new submount (ie to setup the fake directory
 269  * which represents a DFS referral).
 270  */
 271 static void
 272 cifs_create_dfs_fattr(struct cifs_fattr *fattr, struct super_block *sb)
 273 {
 274         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 275
 276         cFYI(1, "creating fake fattr for DFS referral");
 277
 278         memset(fattr, 0, sizeof(*fattr));
 279         fattr->cf_mode = S_IFDIR | S_IXUGO | S_IRWXU;
 280         fattr->cf_uid = cifs_sb->mnt_uid;
 281         fattr->cf_gid = cifs_sb->mnt_gid;
 282         fattr->cf_atime = CURRENT_TIME;
 283         fattr->cf_ctime = CURRENT_TIME;
 284         fattr->cf_mtime = CURRENT_TIME;
 285         fattr->cf_nlink = 2;
 286         fattr->cf_flags |= CIFS_FATTR_DFS_REFERRAL;
 287 }
 288
 289 int cifs_get_file_info_unix(struct file *filp)
 290 {
 291         int rc;
 292         unsigned int xid;
 293         FILE_UNIX_BASIC_INFO find_data;
 294         struct cifs_fattr fattr;
 295         struct inode *inode = filp->f_path.dentry->d_inode;
 296         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 297         struct cifsFileInfo *cfile = filp->private_data;
 298         struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
 299
 300         xid = get_xid();
 301         rc = CIFSSMBUnixQFileInfo(xid, tcon, cfile->netfid, &find_data);
 302         if (!rc) {
 303                 cifs_unix_basic_to_fattr(&fattr, &find_data, cifs_sb);
 304         } else if (rc == -EREMOTE) {
 305                 cifs_create_dfs_fattr(&fattr, inode->i_sb);
 306                 rc = 0;
 307         }
 308
 309         cifs_fattr_to_inode(inode, &fattr);
 310         free_xid(xid);
 311         return rc;
 312 }
 313
 314 int cifs_get_inode_info_unix(struct inode **pinode,
 315                              const unsigned char *full_path,
 316                              struct super_block *sb, unsigned int xid)
 317 {
 318         int rc;
 319         FILE_UNIX_BASIC_INFO find_data;
 320         struct cifs_fattr fattr;
 321         struct cifs_tcon *tcon;
 322         struct tcon_link *tlink;
 323         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 324
 325         cFYI(1, "Getting info on %s", full_path);
 326
 327         tlink = cifs_sb_tlink(cifs_sb);
 328         if (IS_ERR(tlink))
 329                 return PTR_ERR(tlink);
 330         tcon = tlink_tcon(tlink);
 331
 332         /* could have done a find first instead but this returns more info */
 333         rc = CIFSSMBUnixQPathInfo(xid, tcon, full_path, &find_data,
 334                                   cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
 335                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 336         cifs_put_tlink(tlink);
 337
 338         if (!rc) {
 339                 cifs_unix_basic_to_fattr(&fattr, &find_data, cifs_sb);
 340         } else if (rc == -EREMOTE) {
 341                 cifs_create_dfs_fattr(&fattr, sb);
 342                 rc = 0;
 343         } else {
 344                 return rc;
 345         }
 346
 347         /* check for Minshall+French symlinks */
 348         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
 349                 int tmprc = CIFSCheckMFSymlink(&fattr, full_path, cifs_sb, xid);
 350                 if (tmprc)
 351                         cFYI(1, "CIFSCheckMFSymlink: %d", tmprc);
 352         }
 353
 354         if (*pinode == NULL) {
 355                 /* get new inode */
 356                 cifs_fill_uniqueid(sb, &fattr);
 357                 *pinode = cifs_iget(sb, &fattr);
 358                 if (!*pinode)
 359                         rc = -ENOMEM;
 360         } else {
 361                 /* we already have inode, update it */
 362                 cifs_fattr_to_inode(*pinode, &fattr);
 363         }
 364
 365         return rc;
 366 }
 367
 368 static int
 369 cifs_sfu_type(struct cifs_fattr *fattr, const unsigned char *path,
 370               struct cifs_sb_info *cifs_sb, unsigned int xid)
 371 {
 372         int rc;
 373         int oplock = 0;
 374         __u16 netfid;
 375         struct tcon_link *tlink;
 376         struct cifs_tcon *tcon;
 377         struct cifs_io_parms io_parms;
 378         char buf[24];
 379         unsigned int bytes_read;
 380         char *pbuf;
 381
 382         pbuf = buf;
 383
 384         fattr->cf_mode &= ~S_IFMT;
 385
 386         if (fattr->cf_eof == 0) {
 387                 fattr->cf_mode |= S_IFIFO;
 388                 fattr->cf_dtype = DT_FIFO;
 389                 return 0;
 390         } else if (fattr->cf_eof < 8) {
 391                 fattr->cf_mode |= S_IFREG;
 392                 fattr->cf_dtype = DT_REG;
 393                 return -EINVAL;  /* EOPNOTSUPP? */
 394         }
 395
 396         tlink = cifs_sb_tlink(cifs_sb);
 397         if (IS_ERR(tlink))
 398                 return PTR_ERR(tlink);
 399         tcon = tlink_tcon(tlink);
 400
 401         rc = CIFSSMBOpen(xid, tcon, path, FILE_OPEN, GENERIC_READ,
 402                          CREATE_NOT_DIR, &netfid, &oplock, NULL,
 403                          cifs_sb->local_nls,
 404                          cifs_sb->mnt_cifs_flags &
 405                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 406         if (rc == 0) {
 407                 int buf_type = CIFS_NO_BUFFER;
 408                         /* Read header */
 409                 io_parms.netfid = netfid;
 410                 io_parms.pid = current->tgid;
 411                 io_parms.tcon = tcon;
 412                 io_parms.offset = 0;
 413                 io_parms.length = 24;
 414                 rc = CIFSSMBRead(xid, &io_parms, &bytes_read, &pbuf,
 415                                  &buf_type);
 416                 if ((rc == 0) && (bytes_read >= 8)) {
 417                         if (memcmp("IntxBLK", pbuf, 8) == 0) {
 418                                 cFYI(1, "Block device");
 419                                 fattr->cf_mode |= S_IFBLK;
 420                                 fattr->cf_dtype = DT_BLK;
 421                                 if (bytes_read == 24) {
 422                                         /* we have enough to decode dev num */
 423                                         __u64 mjr; /* major */
 424                                         __u64 mnr; /* minor */
 425                                         mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
 426                                         mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
 427                                         fattr->cf_rdev = MKDEV(mjr, mnr);
 428                                 }
 429                         } else if (memcmp("IntxCHR", pbuf, 8) == 0) {
 430                                 cFYI(1, "Char device");
 431                                 fattr->cf_mode |= S_IFCHR;
 432                                 fattr->cf_dtype = DT_CHR;
 433                                 if (bytes_read == 24) {
 434                                         /* we have enough to decode dev num */
 435                                         __u64 mjr; /* major */
 436                                         __u64 mnr; /* minor */
 437                                         mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
 438                                         mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
 439                                         fattr->cf_rdev = MKDEV(mjr, mnr);
 440                                 }
 441                         } else if (memcmp("IntxLNK", pbuf, 7) == 0) {
 442                                 cFYI(1, "Symlink");
 443                                 fattr->cf_mode |= S_IFLNK;
 444                                 fattr->cf_dtype = DT_LNK;
 445                         } else {
 446                                 fattr->cf_mode |= S_IFREG; /* file? */
 447                                 fattr->cf_dtype = DT_REG;
 448                                 rc = -EOPNOTSUPP;
 449                         }
 450                 } else {
 451                         fattr->cf_mode |= S_IFREG; /* then it is a file */
 452                         fattr->cf_dtype = DT_REG;
 453                         rc = -EOPNOTSUPP; /* or some unknown SFU type */
 454                 }
 455                 CIFSSMBClose(xid, tcon, netfid);
 456         }
 457         cifs_put_tlink(tlink);
 458         return rc;
 459 }
 460
 461 #define SFBITS_MASK (S_ISVTX | S_ISGID | S_ISUID)  /* SETFILEBITS valid bits */
 462
 463 /*
 464  * Fetch mode bits as provided by SFU.
 465  *
 466  * FIXME: Doesn't this clobber the type bit we got from cifs_sfu_type ?
 467  */
 468 static int cifs_sfu_mode(struct cifs_fattr *fattr, const unsigned char *path,
 469                          struct cifs_sb_info *cifs_sb, unsigned int xid)
 470 {
 471 #ifdef CONFIG_CIFS_XATTR
 472         ssize_t rc;
 473         char ea_value[4];
 474         __u32 mode;
 475         struct tcon_link *tlink;
 476         struct cifs_tcon *tcon;
 477
 478         tlink = cifs_sb_tlink(cifs_sb);
 479         if (IS_ERR(tlink))
 480                 return PTR_ERR(tlink);
 481         tcon = tlink_tcon(tlink);
 482
 483         rc = CIFSSMBQAllEAs(xid, tcon, path, "SETFILEBITS",
 484                             ea_value, 4 /* size of buf */, cifs_sb->local_nls,
 485                             cifs_sb->mnt_cifs_flags &
 486                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 487         cifs_put_tlink(tlink);
 488         if (rc < 0)
 489                 return (int)rc;
 490         else if (rc > 3) {
 491                 mode = le32_to_cpu(*((__le32 *)ea_value));
 492                 fattr->cf_mode &= ~SFBITS_MASK;
 493                 cFYI(1, "special bits 0%o org mode 0%o", mode,
 494                          fattr->cf_mode);
 495                 fattr->cf_mode = (mode & SFBITS_MASK) | fattr->cf_mode;
 496                 cFYI(1, "special mode bits 0%o", mode);
 497         }
 498
 499         return 0;
 500 #else
 501         return -EOPNOTSUPP;
 502 #endif
 503 }
 504
 505 /* Fill a cifs_fattr struct with info from FILE_ALL_INFO */
 506 static void
 507 cifs_all_info_to_fattr(struct cifs_fattr *fattr, FILE_ALL_INFO *info,
 508                        struct cifs_sb_info *cifs_sb, bool adjust_tz)
 509 {
 510         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
 511
 512         memset(fattr, 0, sizeof(*fattr));
 513         fattr->cf_cifsattrs = le32_to_cpu(info->Attributes);
 514         if (info->DeletePending)
 515                 fattr->cf_flags |= CIFS_FATTR_DELETE_PENDING;
 516
 517         if (info->LastAccessTime)
 518                 fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
 519         else
 520                 fattr->cf_atime = CURRENT_TIME;
 521
 522         fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime);
 523         fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
 524
 525         if (adjust_tz) {
 526                 fattr->cf_ctime.tv_sec += tcon->ses->server->timeAdj;
 527                 fattr->cf_mtime.tv_sec += tcon->ses->server->timeAdj;
 528         }
 529
 530         fattr->cf_eof = le64_to_cpu(info->EndOfFile);
 531         fattr->cf_bytes = le64_to_cpu(info->AllocationSize);
 532         fattr->cf_createtime = le64_to_cpu(info->CreationTime);
 533
 534         if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
 535                 fattr->cf_mode = S_IFDIR | cifs_sb->mnt_dir_mode;
 536                 fattr->cf_dtype = DT_DIR;
 537                 /*
 538                  * Server can return wrong NumberOfLinks value for directories
 539                  * when Unix extensions are disabled - fake it.
 540                  */
 541                 fattr->cf_nlink = 2;
 542         } else {
 543                 fattr->cf_mode = S_IFREG | cifs_sb->mnt_file_mode;
 544                 fattr->cf_dtype = DT_REG;
 545
 546                 /* clear write bits if ATTR_READONLY is set */
 547                 if (fattr->cf_cifsattrs & ATTR_READONLY)
 548                         fattr->cf_mode &= ~(S_IWUGO);
 549
 550                 fattr->cf_nlink = le32_to_cpu(info->NumberOfLinks);
 551         }
 552
 553         fattr->cf_uid = cifs_sb->mnt_uid;
 554         fattr->cf_gid = cifs_sb->mnt_gid;
 555 }
 556
 557 int cifs_get_file_info(struct file *filp)
 558 {
 559         int rc;
 560         unsigned int xid;
 561         FILE_ALL_INFO find_data;
 562         struct cifs_fattr fattr;
 563         struct inode *inode = filp->f_path.dentry->d_inode;
 564         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 565         struct cifsFileInfo *cfile = filp->private_data;
 566         struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
 567
 568         xid = get_xid();
 569         rc = CIFSSMBQFileInfo(xid, tcon, cfile->netfid, &find_data);
 570         switch (rc) {
 571         case 0:
 572                 cifs_all_info_to_fattr(&fattr, &find_data, cifs_sb, false);
 573                 break;
 574         case -EREMOTE:
 575                 cifs_create_dfs_fattr(&fattr, inode->i_sb);
 576                 rc = 0;
 577                 break;
 578         case -EOPNOTSUPP:
 579         case -EINVAL:
 580                 /*
 581                  * FIXME: legacy server -- fall back to path-based call?
 582                  * for now, just skip revalidating and mark inode for
 583                  * immediate reval.
 584                  */
 585                 rc = 0;
 586                 CIFS_I(inode)->time = 0;
 587         default:
 588                 goto cgfi_exit;
 589         }
 590
 591         /*
 592          * don't bother with SFU junk here -- just mark inode as needing
 593          * revalidation.
 594          */
 595         fattr.cf_uniqueid = CIFS_I(inode)->uniqueid;
 596         fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
 597         cifs_fattr_to_inode(inode, &fattr);
 598 cgfi_exit:
 599         free_xid(xid);
 600         return rc;
 601 }
 602
 603 int
 604 cifs_get_inode_info(struct inode **inode, const char *full_path,
 605                     FILE_ALL_INFO *data, struct super_block *sb, int xid,
 606                     const __u16 *fid)
 607 {
 608         int rc = 0, tmprc;
 609         struct cifs_tcon *tcon;
 610         struct TCP_Server_Info *server;
 611         struct tcon_link *tlink;
 612         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 613         char *buf = NULL;
 614         bool adjust_tz = false;
 615         struct cifs_fattr fattr;
 616
 617         tlink = cifs_sb_tlink(cifs_sb);
 618         if (IS_ERR(tlink))
 619                 return PTR_ERR(tlink);
 620         tcon = tlink_tcon(tlink);
 621         server = tcon->ses->server;
 622
 623         cFYI(1, "Getting info on %s", full_path);
 624
 625         if ((data == NULL) && (*inode != NULL)) {
 626                 if (CIFS_I(*inode)->clientCanCacheRead) {
 627                         cFYI(1, "No need to revalidate cached inode sizes");
 628                         goto cgii_exit;
 629                 }
 630         }
 631
 632         /* if inode info is not passed, get it from server */
 633         if (data == NULL) {
 634                 if (!server->ops->query_path_info) {
 635                         rc = -ENOSYS;
 636                         goto cgii_exit;
 637                 }
 638                 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
 639                 if (buf == NULL) {
 640                         rc = -ENOMEM;
 641                         goto cgii_exit;
 642                 }
 643                 data = (FILE_ALL_INFO *)buf;
 644                 rc = server->ops->query_path_info(xid, tcon, cifs_sb, full_path,
 645                                                   data, &adjust_tz);
 646         }
 647
 648         if (!rc) {
 649                 cifs_all_info_to_fattr(&fattr, (FILE_ALL_INFO *)data, cifs_sb,
 650                                        adjust_tz);
 651         } else if (rc == -EREMOTE) {
 652                 cifs_create_dfs_fattr(&fattr, sb);
 653                 rc = 0;
 654         } else {
 655                 goto cgii_exit;
 656         }
 657
 658         /*
 659          * If an inode wasn't passed in, then get the inode number
 660          *
 661          * Is an i_ino of zero legal? Can we use that to check if the server
 662          * supports returning inode numbers?  Are there other sanity checks we
 663          * can use to ensure that the server is really filling in that field?
 664          */
 665         if (*inode == NULL) {
 666                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 667                         if (server->ops->get_srv_inum)
 668                                 tmprc = server->ops->get_srv_inum(xid, tcon,
 669                                         cifs_sb, full_path, &fattr.cf_uniqueid,
 670                                         data);
 671                         else
 672                                 tmprc = -ENOSYS;
 673                         if (tmprc || !fattr.cf_uniqueid) {
 674                                 cFYI(1, "GetSrvInodeNum rc %d", tmprc);
 675                                 fattr.cf_uniqueid = iunique(sb, ROOT_I);
 676                                 cifs_autodisable_serverino(cifs_sb);
 677                         }
 678                 } else {
 679                         fattr.cf_uniqueid = iunique(sb, ROOT_I);
 680                 }
 681         } else {
 682                 fattr.cf_uniqueid = CIFS_I(*inode)->uniqueid;
 683         }
 684
 685         /* query for SFU type info if supported and needed */
 686         if (fattr.cf_cifsattrs & ATTR_SYSTEM &&
 687             cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
 688                 tmprc = cifs_sfu_type(&fattr, full_path, cifs_sb, xid);
 689                 if (tmprc)
 690                         cFYI(1, "cifs_sfu_type failed: %d", tmprc);
 691         }
 692
 693 #ifdef CONFIG_CIFS_ACL
 694         /* fill in 0777 bits from ACL */
 695         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
 696                 rc = cifs_acl_to_fattr(cifs_sb, &fattr, *inode, full_path, fid);
 697                 if (rc) {
 698                         cFYI(1, "%s: Getting ACL failed with error: %d",
 699                                 __func__, rc);
 700                         goto cgii_exit;
 701                 }
 702         }
 703 #endif /* CONFIG_CIFS_ACL */
 704
 705         /* fill in remaining high mode bits e.g. SUID, VTX */
 706         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
 707                 cifs_sfu_mode(&fattr, full_path, cifs_sb, xid);
 708
 709         /* check for Minshall+French symlinks */
 710         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
 711                 tmprc = CIFSCheckMFSymlink(&fattr, full_path, cifs_sb, xid);
 712                 if (tmprc)
 713                         cFYI(1, "CIFSCheckMFSymlink: %d", tmprc);
 714         }
 715
 716         if (!*inode) {
 717                 *inode = cifs_iget(sb, &fattr);
 718                 if (!*inode)
 719                         rc = -ENOMEM;
 720         } else {
 721                 cifs_fattr_to_inode(*inode, &fattr);
 722         }
 723
 724 cgii_exit:
 725         kfree(buf);
 726         cifs_put_tlink(tlink);
 727         return rc;
 728 }
 729
 730 static const struct inode_operations cifs_ipc_inode_ops = {
 731         .lookup = cifs_lookup,
 732 };
 733
 734 static int
 735 cifs_find_inode(struct inode *inode, void *opaque)
 736 {
 737         struct cifs_fattr *fattr = (struct cifs_fattr *) opaque;
 738
 739         /* don't match inode with different uniqueid */
 740         if (CIFS_I(inode)->uniqueid != fattr->cf_uniqueid)
 741                 return 0;
 742
 743         /* use createtime like an i_generation field */
 744         if (CIFS_I(inode)->createtime != fattr->cf_createtime)
 745                 return 0;
 746
 747         /* don't match inode of different type */
 748         if ((inode->i_mode & S_IFMT) != (fattr->cf_mode & S_IFMT))
 749                 return 0;
 750
 751         /* if it's not a directory or has no dentries, then flag it */
 752         if (S_ISDIR(inode->i_mode) && !hlist_empty(&inode->i_dentry))
 753                 fattr->cf_flags |= CIFS_FATTR_INO_COLLISION;
 754
 755         return 1;
 756 }
 757
 758 static int
 759 cifs_init_inode(struct inode *inode, void *opaque)
 760 {
 761         struct cifs_fattr *fattr = (struct cifs_fattr *) opaque;
 762
 763         CIFS_I(inode)->uniqueid = fattr->cf_uniqueid;
 764         CIFS_I(inode)->createtime = fattr->cf_createtime;
 765         return 0;
 766 }
 767
 768 /*
 769  * walk dentry list for an inode and report whether it has aliases that
 770  * are hashed. We use this to determine if a directory inode can actually
 771  * be used.
 772  */
 773 static bool
 774 inode_has_hashed_dentries(struct inode *inode)
 775 {
 776         struct dentry *dentry;
 777         struct hlist_node *p;
 778
 779         spin_lock(&inode->i_lock);
 780         hlist_for_each_entry(dentry, p, &inode->i_dentry, d_alias) {
 781                 if (!d_unhashed(dentry) || IS_ROOT(dentry)) {
 782                         spin_unlock(&inode->i_lock);
 783                         return true;
 784                 }
 785         }
 786         spin_unlock(&inode->i_lock);
 787         return false;
 788 }
 789
 790 /* Given fattrs, get a corresponding inode */
 791 struct inode *
 792 cifs_iget(struct super_block *sb, struct cifs_fattr *fattr)
 793 {
 794         unsigned long hash;
 795         struct inode *inode;
 796
 797 retry_iget5_locked:
 798         cFYI(1, "looking for uniqueid=%llu", fattr->cf_uniqueid);
 799
 800         /* hash down to 32-bits on 32-bit arch */
 801         hash = cifs_uniqueid_to_ino_t(fattr->cf_uniqueid);
 802
 803         inode = iget5_locked(sb, hash, cifs_find_inode, cifs_init_inode, fattr);
 804         if (inode) {
 805                 /* was there a potentially problematic inode collision? */
 806                 if (fattr->cf_flags & CIFS_FATTR_INO_COLLISION) {
 807                         fattr->cf_flags &= ~CIFS_FATTR_INO_COLLISION;
 808
 809                         if (inode_has_hashed_dentries(inode)) {
 810                                 cifs_autodisable_serverino(CIFS_SB(sb));
 811                                 iput(inode);
 812                                 fattr->cf_uniqueid = iunique(sb, ROOT_I);
 813                                 goto retry_iget5_locked;
 814                         }
 815                 }
 816
 817                 cifs_fattr_to_inode(inode, fattr);
 818                 if (sb->s_flags & MS_NOATIME)
 819                         inode->i_flags |= S_NOATIME | S_NOCMTIME;
 820                 if (inode->i_state & I_NEW) {
 821                         inode->i_ino = hash;
 822                         if (S_ISREG(inode->i_mode))
 823                                 inode->i_data.backing_dev_info = sb->s_bdi;
 824 #ifdef CONFIG_CIFS_FSCACHE
 825                         /* initialize per-inode cache cookie pointer */
 826                         CIFS_I(inode)->fscache = NULL;
 827 #endif
 828                         unlock_new_inode(inode);
 829                 }
 830         }
 831
 832         return inode;
 833 }
 834
 835 /* gets root inode */
 836 struct inode *cifs_root_iget(struct super_block *sb)
 837 {
 838         unsigned int xid;
 839         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 840         struct inode *inode = NULL;
 841         long rc;
 842         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
 843
 844         xid = get_xid();
 845         if (tcon->unix_ext)
 846                 rc = cifs_get_inode_info_unix(&inode, "", sb, xid);
 847         else
 848                 rc = cifs_get_inode_info(&inode, "", NULL, sb, xid, NULL);
 849
 850         if (!inode) {
 851                 inode = ERR_PTR(rc);
 852                 goto out;
 853         }
 854
 855 #ifdef CONFIG_CIFS_FSCACHE
 856         /* populate tcon->resource_id */
 857         tcon->resource_id = CIFS_I(inode)->uniqueid;
 858 #endif
 859
 860         if (rc && tcon->ipc) {
 861                 cFYI(1, "ipc connection - fake read inode");
 862                 inode->i_mode |= S_IFDIR;
 863                 set_nlink(inode, 2);
 864                 inode->i_op = &cifs_ipc_inode_ops;
 865                 inode->i_fop = &simple_dir_operations;
 866                 inode->i_uid = cifs_sb->mnt_uid;
 867                 inode->i_gid = cifs_sb->mnt_gid;
 868         } else if (rc) {
 869                 iget_failed(inode);
 870                 inode = ERR_PTR(rc);
 871         }
 872
 873 out:
 874         /* can not call macro free_xid here since in a void func
 875          * TODO: This is no longer true
 876          */
 877         _free_xid(xid);
 878         return inode;
 879 }
 880
 881 static int
 882 cifs_set_file_info(struct inode *inode, struct iattr *attrs, unsigned int xid,
 883                     char *full_path, __u32 dosattr)
 884 {
 885         int rc;
 886         int oplock = 0;
 887         __u16 netfid;
 888         __u32 netpid;
 889         bool set_time = false;
 890         struct cifsFileInfo *open_file;
 891         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
 892         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 893         struct tcon_link *tlink = NULL;
 894         struct cifs_tcon *pTcon;
 895         FILE_BASIC_INFO info_buf;
 896
 897         if (attrs == NULL)
 898                 return -EINVAL;
 899
 900         if (attrs->ia_valid & ATTR_ATIME) {
 901                 set_time = true;
 902                 info_buf.LastAccessTime =
 903                         cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
 904         } else
 905                 info_buf.LastAccessTime = 0;
 906
 907         if (attrs->ia_valid & ATTR_MTIME) {
 908                 set_time = true;
 909                 info_buf.LastWriteTime =
 910                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
 911         } else
 912                 info_buf.LastWriteTime = 0;
 913
 914         /*
 915          * Samba throws this field away, but windows may actually use it.
 916          * Do not set ctime unless other time stamps are changed explicitly
 917          * (i.e. by utimes()) since we would then have a mix of client and
 918          * server times.
 919          */
 920         if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
 921                 cFYI(1, "CIFS - CTIME changed");
 922                 info_buf.ChangeTime =
 923                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
 924         } else
 925                 info_buf.ChangeTime = 0;
 926
 927         info_buf.CreationTime = 0;      /* don't change */
 928         info_buf.Attributes = cpu_to_le32(dosattr);
 929
 930         /*
 931          * If the file is already open for write, just use that fileid
 932          */
 933         open_file = find_writable_file(cifsInode, true);
 934         if (open_file) {
 935                 netfid = open_file->netfid;
 936                 netpid = open_file->pid;
 937                 pTcon = tlink_tcon(open_file->tlink);
 938                 goto set_via_filehandle;
 939         }
 940
 941         tlink = cifs_sb_tlink(cifs_sb);
 942         if (IS_ERR(tlink)) {
 943                 rc = PTR_ERR(tlink);
 944                 tlink = NULL;
 945                 goto out;
 946         }
 947         pTcon = tlink_tcon(tlink);
 948
 949         /*
 950          * NT4 apparently returns success on this call, but it doesn't
 951          * really work.
 952          */
 953         if (!(pTcon->ses->flags & CIFS_SES_NT4)) {
 954                 rc = CIFSSMBSetPathInfo(xid, pTcon, full_path,
 955                                      &info_buf, cifs_sb->local_nls,
 956                                      cifs_sb->mnt_cifs_flags &
 957                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 958                 if (rc == 0) {
 959                         cifsInode->cifsAttrs = dosattr;
 960                         goto out;
 961                 } else if (rc != -EOPNOTSUPP && rc != -EINVAL)
 962                         goto out;
 963         }
 964
 965         cFYI(1, "calling SetFileInfo since SetPathInfo for "
 966                  "times not supported by this server");
 967         rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
 968                          SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
 969                          CREATE_NOT_DIR, &netfid, &oplock,
 970                          NULL, cifs_sb->local_nls,
 971                          cifs_sb->mnt_cifs_flags &
 972                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 973
 974         if (rc != 0) {
 975                 if (rc == -EIO)
 976                         rc = -EINVAL;
 977                 goto out;
 978         }
 979
 980         netpid = current->tgid;
 981
 982 set_via_filehandle:
 983         rc = CIFSSMBSetFileInfo(xid, pTcon, &info_buf, netfid, netpid);
 984         if (!rc)
 985                 cifsInode->cifsAttrs = dosattr;
 986
 987         if (open_file == NULL)
 988                 CIFSSMBClose(xid, pTcon, netfid);
 989         else
 990                 cifsFileInfo_put(open_file);
 991 out:
 992         if (tlink != NULL)
 993                 cifs_put_tlink(tlink);
 994         return rc;
 995 }
 996
 997 /*
 998  * open the given file (if it isn't already), set the DELETE_ON_CLOSE bit
 999  * and rename it to a random name that hopefully won't conflict with
1000  * anything else.
1001  */
1002 static int
1003 cifs_rename_pending_delete(char *full_path, struct dentry *dentry,
1004                            unsigned int xid)
1005 {
1006         int oplock = 0;
1007         int rc;
1008         __u16 netfid;
1009         struct inode *inode = dentry->d_inode;
1010         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1011         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1012         struct tcon_link *tlink;
1013         struct cifs_tcon *tcon;
1014         __u32 dosattr, origattr;
1015         FILE_BASIC_INFO *info_buf = NULL;
1016
1017         tlink = cifs_sb_tlink(cifs_sb);
1018         if (IS_ERR(tlink))
1019                 return PTR_ERR(tlink);
1020         tcon = tlink_tcon(tlink);
1021
1022         rc = CIFSSMBOpen(xid, tcon, full_path, FILE_OPEN,
1023                          DELETE|FILE_WRITE_ATTRIBUTES, CREATE_NOT_DIR,
1024                          &netfid, &oplock, NULL, cifs_sb->local_nls,
1025                          cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1026         if (rc != 0)
1027                 goto out;
1028
1029         origattr = cifsInode->cifsAttrs;
1030         if (origattr == 0)
1031                 origattr |= ATTR_NORMAL;
1032
1033         dosattr = origattr & ~ATTR_READONLY;
1034         if (dosattr == 0)
1035                 dosattr |= ATTR_NORMAL;
1036         dosattr |= ATTR_HIDDEN;
1037
1038         /* set ATTR_HIDDEN and clear ATTR_READONLY, but only if needed */
1039         if (dosattr != origattr) {
1040                 info_buf = kzalloc(sizeof(*info_buf), GFP_KERNEL);
1041                 if (info_buf == NULL) {
1042                         rc = -ENOMEM;
1043                         goto out_close;
1044                 }
1045                 info_buf->Attributes = cpu_to_le32(dosattr);
1046                 rc = CIFSSMBSetFileInfo(xid, tcon, info_buf, netfid,
1047                                         current->tgid);
1048                 /* although we would like to mark the file hidden
1049                    if that fails we will still try to rename it */
1050                 if (rc != 0)
1051                         cifsInode->cifsAttrs = dosattr;
1052                 else
1053                         dosattr = origattr; /* since not able to change them */
1054         }
1055
1056         /* rename the file */
1057         rc = CIFSSMBRenameOpenFile(xid, tcon, netfid, NULL, cifs_sb->local_nls,
1058                                    cifs_sb->mnt_cifs_flags &
1059                                             CIFS_MOUNT_MAP_SPECIAL_CHR);
1060         if (rc != 0) {
1061                 rc = -ETXTBSY;
1062                 goto undo_setattr;
1063         }
1064
1065         /* try to set DELETE_ON_CLOSE */
1066         if (!cifsInode->delete_pending) {
1067                 rc = CIFSSMBSetFileDisposition(xid, tcon, true, netfid,
1068                                                current->tgid);
1069                 /*
1070                  * some samba versions return -ENOENT when we try to set the
1071                  * file disposition here. Likely a samba bug, but work around
1072                  * it for now. This means that some cifsXXX files may hang
1073                  * around after they shouldn't.
1074                  *
1075                  * BB: remove this hack after more servers have the fix
1076                  */
1077                 if (rc == -ENOENT)
1078                         rc = 0;
1079                 else if (rc != 0) {
1080                         rc = -ETXTBSY;
1081                         goto undo_rename;
1082                 }
1083                 cifsInode->delete_pending = true;
1084         }
1085
1086 out_close:
1087         CIFSSMBClose(xid, tcon, netfid);
1088 out:
1089         kfree(info_buf);
1090         cifs_put_tlink(tlink);
1091         return rc;
1092
1093         /*
1094          * reset everything back to the original state. Don't bother
1095          * dealing with errors here since we can't do anything about
1096          * them anyway.
1097          */
1098 undo_rename:
1099         CIFSSMBRenameOpenFile(xid, tcon, netfid, dentry->d_name.name,
1100                                 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1101                                             CIFS_MOUNT_MAP_SPECIAL_CHR);
1102 undo_setattr:
1103         if (dosattr != origattr) {
1104                 info_buf->Attributes = cpu_to_le32(origattr);
1105                 if (!CIFSSMBSetFileInfo(xid, tcon, info_buf, netfid,
1106                                         current->tgid))
1107                         cifsInode->cifsAttrs = origattr;
1108         }
1109
1110         goto out_close;
1111 }
1112
1113
1114 /*
1115  * If dentry->d_inode is null (usually meaning the cached dentry
1116  * is a negative dentry) then we would attempt a standard SMB delete, but
1117  * if that fails we can not attempt the fall back mechanisms on EACCESS
1118  * but will return the EACCESS to the caller. Note that the VFS does not call
1119  * unlink on negative dentries currently.
1120  */
1121 int cifs_unlink(struct inode *dir, struct dentry *dentry)
1122 {
1123         int rc = 0;
1124         unsigned int xid;
1125         char *full_path = NULL;
1126         struct inode *inode = dentry->d_inode;
1127         struct cifsInodeInfo *cifs_inode;
1128         struct super_block *sb = dir->i_sb;
1129         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
1130         struct tcon_link *tlink;
1131         struct cifs_tcon *tcon;
1132         struct iattr *attrs = NULL;
1133         __u32 dosattr = 0, origattr = 0;
1134
1135         cFYI(1, "cifs_unlink, dir=0x%p, dentry=0x%p", dir, dentry);
1136
1137         tlink = cifs_sb_tlink(cifs_sb);
1138         if (IS_ERR(tlink))
1139                 return PTR_ERR(tlink);
1140         tcon = tlink_tcon(tlink);
1141
1142         xid = get_xid();
1143
1144         /* Unlink can be called from rename so we can not take the
1145          * sb->s_vfs_rename_mutex here */
1146         full_path = build_path_from_dentry(dentry);
1147         if (full_path == NULL) {
1148                 rc = -ENOMEM;
1149                 goto unlink_out;
1150         }
1151
1152         if (cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP &
1153                                 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
1154                 rc = CIFSPOSIXDelFile(xid, tcon, full_path,
1155                         SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls,
1156                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1157                 cFYI(1, "posix del rc %d", rc);
1158                 if ((rc == 0) || (rc == -ENOENT))
1159                         goto psx_del_no_retry;
1160         }
1161
1162 retry_std_delete:
1163         rc = CIFSSMBDelFile(xid, tcon, full_path, cifs_sb->local_nls,
1164                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1165
1166 psx_del_no_retry:
1167         if (!rc) {
1168                 if (inode)
1169                         drop_nlink(inode);
1170         } else if (rc == -ENOENT) {
1171                 d_drop(dentry);
1172         } else if (rc == -ETXTBSY) {
1173                 rc = cifs_rename_pending_delete(full_path, dentry, xid);
1174                 if (rc == 0)
1175                         drop_nlink(inode);
1176         } else if ((rc == -EACCES) && (dosattr == 0) && inode) {
1177                 attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
1178                 if (attrs == NULL) {
1179                         rc = -ENOMEM;
1180                         goto out_reval;
1181                 }
1182
1183                 /* try to reset dos attributes */
1184                 cifs_inode = CIFS_I(inode);
1185                 origattr = cifs_inode->cifsAttrs;
1186                 if (origattr == 0)
1187                         origattr |= ATTR_NORMAL;
1188                 dosattr = origattr & ~ATTR_READONLY;
1189                 if (dosattr == 0)
1190                         dosattr |= ATTR_NORMAL;
1191                 dosattr |= ATTR_HIDDEN;
1192
1193                 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
1194                 if (rc != 0)
1195                         goto out_reval;
1196
1197                 goto retry_std_delete;
1198         }
1199
1200         /* undo the setattr if we errored out and it's needed */
1201         if (rc != 0 && dosattr != 0)
1202                 cifs_set_file_info(inode, attrs, xid, full_path, origattr);
1203
1204 out_reval:
1205         if (inode) {
1206                 cifs_inode = CIFS_I(inode);
1207                 cifs_inode->time = 0;   /* will force revalidate to get info
1208                                            when needed */
1209                 inode->i_ctime = current_fs_time(sb);
1210         }
1211         dir->i_ctime = dir->i_mtime = current_fs_time(sb);
1212         cifs_inode = CIFS_I(dir);
1213         CIFS_I(dir)->time = 0;  /* force revalidate of dir as well */
1214 unlink_out:
1215         kfree(full_path);
1216         kfree(attrs);
1217         free_xid(xid);
1218         cifs_put_tlink(tlink);
1219         return rc;
1220 }
1221
1222 int cifs_mkdir(struct inode *inode, struct dentry *direntry, umode_t mode)
1223 {
1224         int rc = 0, tmprc;
1225         unsigned int xid;
1226         struct cifs_sb_info *cifs_sb;
1227         struct tcon_link *tlink;
1228         struct cifs_tcon *tcon;
1229         char *full_path = NULL;
1230         struct inode *newinode = NULL;
1231         struct cifs_fattr fattr;
1232
1233         cFYI(1, "In cifs_mkdir, mode = 0x%hx inode = 0x%p", mode, inode);
1234
1235         cifs_sb = CIFS_SB(inode->i_sb);
1236         tlink = cifs_sb_tlink(cifs_sb);
1237         if (IS_ERR(tlink))
1238                 return PTR_ERR(tlink);
1239         tcon = tlink_tcon(tlink);
1240
1241         xid = get_xid();
1242
1243         full_path = build_path_from_dentry(direntry);
1244         if (full_path == NULL) {
1245                 rc = -ENOMEM;
1246                 goto mkdir_out;
1247         }
1248
1249         if (cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP &
1250                                 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
1251                 u32 oplock = 0;
1252                 FILE_UNIX_BASIC_INFO *pInfo =
1253                         kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
1254                 if (pInfo == NULL) {
1255                         rc = -ENOMEM;
1256                         goto mkdir_out;
1257                 }
1258
1259                 mode &= ~current_umask();
1260                 rc = CIFSPOSIXCreate(xid, tcon, SMB_O_DIRECTORY | SMB_O_CREAT,
1261                                 mode, NULL /* netfid */, pInfo, &oplock,
1262                                 full_path, cifs_sb->local_nls,
1263                                 cifs_sb->mnt_cifs_flags &
1264                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1265                 if (rc == -EOPNOTSUPP) {
1266                         kfree(pInfo);
1267                         goto mkdir_retry_old;
1268                 } else if (rc) {
1269                         cFYI(1, "posix mkdir returned 0x%x", rc);
1270                         d_drop(direntry);
1271                 } else {
1272                         if (pInfo->Type == cpu_to_le32(-1)) {
1273                                 /* no return info, go query for it */
1274                                 kfree(pInfo);
1275                                 goto mkdir_get_info;
1276                         }
1277 /*BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if need
1278         to set uid/gid */
1279
1280                         cifs_unix_basic_to_fattr(&fattr, pInfo, cifs_sb);
1281                         cifs_fill_uniqueid(inode->i_sb, &fattr);
1282                         newinode = cifs_iget(inode->i_sb, &fattr);
1283                         if (!newinode) {
1284                                 kfree(pInfo);
1285                                 goto mkdir_get_info;
1286                         }
1287
1288                         d_instantiate(direntry, newinode);
1289
1290 #ifdef CONFIG_CIFS_DEBUG2
1291                         cFYI(1, "instantiated dentry %p %s to inode %p",
1292                                 direntry, direntry->d_name.name, newinode);
1293
1294                         if (newinode->i_nlink != 2)
1295                                 cFYI(1, "unexpected number of links %d",
1296                                         newinode->i_nlink);
1297 #endif
1298                 }
1299                 kfree(pInfo);
1300                 goto mkdir_out;
1301         }
1302 mkdir_retry_old:
1303         /* BB add setting the equivalent of mode via CreateX w/ACLs */
1304         rc = CIFSSMBMkDir(xid, tcon, full_path, cifs_sb->local_nls,
1305                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1306         if (rc) {
1307                 cFYI(1, "cifs_mkdir returned 0x%x", rc);
1308                 d_drop(direntry);
1309         } else {
1310 mkdir_get_info:
1311                 if (tcon->unix_ext)
1312                         rc = cifs_get_inode_info_unix(&newinode, full_path,
1313                                                       inode->i_sb, xid);
1314                 else
1315                         rc = cifs_get_inode_info(&newinode, full_path, NULL,
1316                                                  inode->i_sb, xid, NULL);
1317
1318                 d_instantiate(direntry, newinode);
1319                  /* setting nlink not necessary except in cases where we
1320                   * failed to get it from the server or was set bogus */
1321                 if ((direntry->d_inode) && (direntry->d_inode->i_nlink < 2))
1322                         set_nlink(direntry->d_inode, 2);
1323
1324                 mode &= ~current_umask();
1325                 /* must turn on setgid bit if parent dir has it */
1326                 if (inode->i_mode & S_ISGID)
1327                         mode |= S_ISGID;
1328
1329                 if (tcon->unix_ext) {
1330                         struct cifs_unix_set_info_args args = {
1331                                 .mode   = mode,
1332                                 .ctime  = NO_CHANGE_64,
1333                                 .atime  = NO_CHANGE_64,
1334                                 .mtime  = NO_CHANGE_64,
1335                                 .device = 0,
1336                         };
1337                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1338                                 args.uid = (__u64)current_fsuid();
1339                                 if (inode->i_mode & S_ISGID)
1340                                         args.gid = (__u64)inode->i_gid;
1341                                 else
1342                                         args.gid = (__u64)current_fsgid();
1343                         } else {
1344                                 args.uid = NO_CHANGE_64;
1345                                 args.gid = NO_CHANGE_64;
1346                         }
1347                         CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args,
1348                                                cifs_sb->local_nls,
1349                                                cifs_sb->mnt_cifs_flags &
1350                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1351                 } else {
1352                         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
1353                             (mode & S_IWUGO) == 0) {
1354                                 FILE_BASIC_INFO pInfo;
1355                                 struct cifsInodeInfo *cifsInode;
1356                                 u32 dosattrs;
1357
1358                                 memset(&pInfo, 0, sizeof(pInfo));
1359                                 cifsInode = CIFS_I(newinode);
1360                                 dosattrs = cifsInode->cifsAttrs|ATTR_READONLY;
1361                                 pInfo.Attributes = cpu_to_le32(dosattrs);
1362                                 tmprc = CIFSSMBSetPathInfo(xid, tcon,
1363                                                 full_path, &pInfo,
1364                                                 cifs_sb->local_nls,
1365                                                 cifs_sb->mnt_cifs_flags &
1366                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1367                                 if (tmprc == 0)
1368                                         cifsInode->cifsAttrs = dosattrs;
1369                         }
1370                         if (direntry->d_inode) {
1371                                 if (cifs_sb->mnt_cifs_flags &
1372                                      CIFS_MOUNT_DYNPERM)
1373                                         direntry->d_inode->i_mode =
1374                                                 (mode | S_IFDIR);
1375
1376                                 if (cifs_sb->mnt_cifs_flags &
1377                                      CIFS_MOUNT_SET_UID) {
1378                                         direntry->d_inode->i_uid =
1379                                                 current_fsuid();
1380                                         if (inode->i_mode & S_ISGID)
1381                                                 direntry->d_inode->i_gid =
1382                                                         inode->i_gid;
1383                                         else
1384                                                 direntry->d_inode->i_gid =
1385                                                         current_fsgid();
1386                                 }
1387                         }
1388                 }
1389         }
1390 mkdir_out:
1391         /*
1392          * Force revalidate to get parent dir info when needed since cached
1393          * attributes are invalid now.
1394          */
1395         CIFS_I(inode)->time = 0;
1396         kfree(full_path);
1397         free_xid(xid);
1398         cifs_put_tlink(tlink);
1399         return rc;
1400 }
1401
1402 int cifs_rmdir(struct inode *inode, struct dentry *direntry)
1403 {
1404         int rc = 0;
1405         unsigned int xid;
1406         struct cifs_sb_info *cifs_sb;
1407         struct tcon_link *tlink;
1408         struct cifs_tcon *pTcon;
1409         char *full_path = NULL;
1410         struct cifsInodeInfo *cifsInode;
1411
1412         cFYI(1, "cifs_rmdir, inode = 0x%p", inode);
1413
1414         xid = get_xid();
1415
1416         full_path = build_path_from_dentry(direntry);
1417         if (full_path == NULL) {
1418                 rc = -ENOMEM;
1419                 goto rmdir_exit;
1420         }
1421
1422         cifs_sb = CIFS_SB(inode->i_sb);
1423         tlink = cifs_sb_tlink(cifs_sb);
1424         if (IS_ERR(tlink)) {
1425                 rc = PTR_ERR(tlink);
1426                 goto rmdir_exit;
1427         }
1428         pTcon = tlink_tcon(tlink);
1429
1430         rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls,
1431                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1432         cifs_put_tlink(tlink);
1433
1434         if (!rc) {
1435                 spin_lock(&direntry->d_inode->i_lock);
1436                 i_size_write(direntry->d_inode, 0);
1437                 clear_nlink(direntry->d_inode);
1438                 spin_unlock(&direntry->d_inode->i_lock);
1439         }
1440
1441         cifsInode = CIFS_I(direntry->d_inode);
1442         /* force revalidate to go get info when needed */
1443         cifsInode->time = 0;
1444
1445         cifsInode = CIFS_I(inode);
1446         /*
1447          * Force revalidate to get parent dir info when needed since cached
1448          * attributes are invalid now.
1449          */
1450         cifsInode->time = 0;
1451
1452         direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
1453                 current_fs_time(inode->i_sb);
1454
1455 rmdir_exit:
1456         kfree(full_path);
1457         free_xid(xid);
1458         return rc;
1459 }
1460
1461 static int
1462 cifs_do_rename(unsigned int xid, struct dentry *from_dentry,
1463                const char *fromPath, struct dentry *to_dentry,
1464                const char *toPath)
1465 {
1466         struct cifs_sb_info *cifs_sb = CIFS_SB(from_dentry->d_sb);
1467         struct tcon_link *tlink;
1468         struct cifs_tcon *pTcon;
1469         __u16 srcfid;
1470         int oplock, rc;
1471
1472         tlink = cifs_sb_tlink(cifs_sb);
1473         if (IS_ERR(tlink))
1474                 return PTR_ERR(tlink);
1475         pTcon = tlink_tcon(tlink);
1476
1477         /* try path-based rename first */
1478         rc = CIFSSMBRename(xid, pTcon, fromPath, toPath, cifs_sb->local_nls,
1479                            cifs_sb->mnt_cifs_flags &
1480                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1481
1482         /*
1483          * don't bother with rename by filehandle unless file is busy and
1484          * source Note that cross directory moves do not work with
1485          * rename by filehandle to various Windows servers.
1486          */
1487         if (rc == 0 || rc != -ETXTBSY)
1488                 goto do_rename_exit;
1489
1490         /* open-file renames don't work across directories */
1491         if (to_dentry->d_parent != from_dentry->d_parent)
1492                 goto do_rename_exit;
1493
1494         /* open the file to be renamed -- we need DELETE perms */
1495         rc = CIFSSMBOpen(xid, pTcon, fromPath, FILE_OPEN, DELETE,
1496                          CREATE_NOT_DIR, &srcfid, &oplock, NULL,
1497                          cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1498                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1499
1500         if (rc == 0) {
1501                 rc = CIFSSMBRenameOpenFile(xid, pTcon, srcfid,
1502                                 (const char *) to_dentry->d_name.name,
1503                                 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1504                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1505
1506                 CIFSSMBClose(xid, pTcon, srcfid);
1507         }
1508 do_rename_exit:
1509         cifs_put_tlink(tlink);
1510         return rc;
1511 }
1512
1513 int cifs_rename(struct inode *source_dir, struct dentry *source_dentry,
1514         struct inode *target_dir, struct dentry *target_dentry)
1515 {
1516         char *fromName = NULL;
1517         char *toName = NULL;
1518         struct cifs_sb_info *cifs_sb;
1519         struct tcon_link *tlink;
1520         struct cifs_tcon *tcon;
1521         FILE_UNIX_BASIC_INFO *info_buf_source = NULL;
1522         FILE_UNIX_BASIC_INFO *info_buf_target;
1523         unsigned int xid;
1524         int rc, tmprc;
1525
1526         cifs_sb = CIFS_SB(source_dir->i_sb);
1527         tlink = cifs_sb_tlink(cifs_sb);
1528         if (IS_ERR(tlink))
1529                 return PTR_ERR(tlink);
1530         tcon = tlink_tcon(tlink);
1531
1532         xid = get_xid();
1533
1534         /*
1535          * we already have the rename sem so we do not need to
1536          * grab it again here to protect the path integrity
1537          */
1538         fromName = build_path_from_dentry(source_dentry);
1539         if (fromName == NULL) {
1540                 rc = -ENOMEM;
1541                 goto cifs_rename_exit;
1542         }
1543
1544         toName = build_path_from_dentry(target_dentry);
1545         if (toName == NULL) {
1546                 rc = -ENOMEM;
1547                 goto cifs_rename_exit;
1548         }
1549
1550         rc = cifs_do_rename(xid, source_dentry, fromName,
1551                             target_dentry, toName);
1552
1553         if (rc == -EEXIST && tcon->unix_ext) {
1554                 /*
1555                  * Are src and dst hardlinks of same inode? We can
1556                  * only tell with unix extensions enabled
1557                  */
1558                 info_buf_source =
1559                         kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO),
1560                                         GFP_KERNEL);
1561                 if (info_buf_source == NULL) {
1562                         rc = -ENOMEM;
1563                         goto cifs_rename_exit;
1564                 }
1565
1566                 info_buf_target = info_buf_source + 1;
1567                 tmprc = CIFSSMBUnixQPathInfo(xid, tcon, fromName,
1568                                         info_buf_source,
1569                                         cifs_sb->local_nls,
1570                                         cifs_sb->mnt_cifs_flags &
1571                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1572                 if (tmprc != 0)
1573                         goto unlink_target;
1574
1575                 tmprc = CIFSSMBUnixQPathInfo(xid, tcon, toName,
1576                                         info_buf_target,
1577                                         cifs_sb->local_nls,
1578                                         cifs_sb->mnt_cifs_flags &
1579                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1580
1581                 if (tmprc == 0 && (info_buf_source->UniqueId ==
1582                                    info_buf_target->UniqueId)) {
1583                         /* same file, POSIX says that this is a noop */
1584                         rc = 0;
1585                         goto cifs_rename_exit;
1586                 }
1587         } /* else ... BB we could add the same check for Windows by
1588                      checking the UniqueId via FILE_INTERNAL_INFO */
1589
1590 unlink_target:
1591         /* Try unlinking the target dentry if it's not negative */
1592         if (target_dentry->d_inode && (rc == -EACCES || rc == -EEXIST)) {
1593                 tmprc = cifs_unlink(target_dir, target_dentry);
1594                 if (tmprc)
1595                         goto cifs_rename_exit;
1596
1597                 rc = cifs_do_rename(xid, source_dentry, fromName,
1598                                     target_dentry, toName);
1599         }
1600
1601 cifs_rename_exit:
1602         kfree(info_buf_source);
1603         kfree(fromName);
1604         kfree(toName);
1605         free_xid(xid);
1606         cifs_put_tlink(tlink);
1607         return rc;
1608 }
1609
1610 static bool
1611 cifs_inode_needs_reval(struct inode *inode)
1612 {
1613         struct cifsInodeInfo *cifs_i = CIFS_I(inode);
1614         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1615
1616         if (cifs_i->clientCanCacheRead)
1617                 return false;
1618
1619         if (!lookupCacheEnabled)
1620                 return true;
1621
1622         if (cifs_i->time == 0)
1623                 return true;
1624
1625         if (!time_in_range(jiffies, cifs_i->time,
1626                                 cifs_i->time + cifs_sb->actimeo))
1627                 return true;
1628
1629         /* hardlinked files w/ noserverino get "special" treatment */
1630         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) &&
1631             S_ISREG(inode->i_mode) && inode->i_nlink != 1)
1632                 return true;
1633
1634         return false;
1635 }
1636
1637 /*
1638  * Zap the cache. Called when invalid_mapping flag is set.
1639  */
1640 int
1641 cifs_invalidate_mapping(struct inode *inode)
1642 {
1643         int rc = 0;
1644         struct cifsInodeInfo *cifs_i = CIFS_I(inode);
1645
1646         cifs_i->invalid_mapping = false;
1647
1648         if (inode->i_mapping && inode->i_mapping->nrpages != 0) {
1649                 rc = invalidate_inode_pages2(inode->i_mapping);
1650                 if (rc) {
1651                         cERROR(1, "%s: could not invalidate inode %p", __func__,
1652                                inode);
1653                         cifs_i->invalid_mapping = true;
1654                 }
1655         }
1656
1657         cifs_fscache_reset_inode_cookie(inode);
1658         return rc;
1659 }
1660
1661 int cifs_revalidate_file_attr(struct file *filp)
1662 {
1663         int rc = 0;
1664         struct inode *inode = filp->f_path.dentry->d_inode;
1665         struct cifsFileInfo *cfile = (struct cifsFileInfo *) filp->private_data;
1666
1667         if (!cifs_inode_needs_reval(inode))
1668                 return rc;
1669
1670         if (tlink_tcon(cfile->tlink)->unix_ext)
1671                 rc = cifs_get_file_info_unix(filp);
1672         else
1673                 rc = cifs_get_file_info(filp);
1674
1675         return rc;
1676 }
1677
1678 int cifs_revalidate_dentry_attr(struct dentry *dentry)
1679 {
1680         unsigned int xid;
1681         int rc = 0;
1682         struct inode *inode = dentry->d_inode;
1683         struct super_block *sb = dentry->d_sb;
1684         char *full_path = NULL;
1685
1686         if (inode == NULL)
1687                 return -ENOENT;
1688
1689         if (!cifs_inode_needs_reval(inode))
1690                 return rc;
1691
1692         xid = get_xid();
1693
1694         /* can not safely grab the rename sem here if rename calls revalidate
1695            since that would deadlock */
1696         full_path = build_path_from_dentry(dentry);
1697         if (full_path == NULL) {
1698                 rc = -ENOMEM;
1699                 goto out;
1700         }
1701
1702         cFYI(1, "Update attributes: %s inode 0x%p count %d dentry: 0x%p d_time "
1703                  "%ld jiffies %ld", full_path, inode, inode->i_count.counter,
1704                  dentry, dentry->d_time, jiffies);
1705
1706         if (cifs_sb_master_tcon(CIFS_SB(sb))->unix_ext)
1707                 rc = cifs_get_inode_info_unix(&inode, full_path, sb, xid);
1708         else
1709                 rc = cifs_get_inode_info(&inode, full_path, NULL, sb,
1710                                          xid, NULL);
1711
1712 out:
1713         kfree(full_path);
1714         free_xid(xid);
1715         return rc;
1716 }
1717
1718 int cifs_revalidate_file(struct file *filp)
1719 {
1720         int rc;
1721         struct inode *inode = filp->f_path.dentry->d_inode;
1722
1723         rc = cifs_revalidate_file_attr(filp);
1724         if (rc)
1725                 return rc;
1726
1727         if (CIFS_I(inode)->invalid_mapping)
1728                 rc = cifs_invalidate_mapping(inode);
1729         return rc;
1730 }
1731
1732 /* revalidate a dentry's inode attributes */
1733 int cifs_revalidate_dentry(struct dentry *dentry)
1734 {
1735         int rc;
1736         struct inode *inode = dentry->d_inode;
1737
1738         rc = cifs_revalidate_dentry_attr(dentry);
1739         if (rc)
1740                 return rc;
1741
1742         if (CIFS_I(inode)->invalid_mapping)
1743                 rc = cifs_invalidate_mapping(inode);
1744         return rc;
1745 }
1746
1747 int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1748                  struct kstat *stat)
1749 {
1750         struct cifs_sb_info *cifs_sb = CIFS_SB(dentry->d_sb);
1751         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
1752         struct inode *inode = dentry->d_inode;
1753         int rc;
1754
1755         /*
1756          * We need to be sure that all dirty pages are written and the server
1757          * has actual ctime, mtime and file length.
1758          */
1759         if (!CIFS_I(inode)->clientCanCacheRead && inode->i_mapping &&
1760             inode->i_mapping->nrpages != 0) {
1761                 rc = filemap_fdatawait(inode->i_mapping);
1762                 if (rc) {
1763                         mapping_set_error(inode->i_mapping, rc);
1764                         return rc;
1765                 }
1766         }
1767
1768         rc = cifs_revalidate_dentry_attr(dentry);
1769         if (rc)
1770                 return rc;
1771
1772         generic_fillattr(inode, stat);
1773         stat->blksize = CIFS_MAX_MSGSIZE;
1774         stat->ino = CIFS_I(inode)->uniqueid;
1775
1776         /*
1777          * If on a multiuser mount without unix extensions, and the admin hasn't
1778          * overridden them, set the ownership to the fsuid/fsgid of the current
1779          * process.
1780          */
1781         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER) &&
1782             !tcon->unix_ext) {
1783                 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID))
1784                         stat->uid = current_fsuid();
1785                 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID))
1786                         stat->gid = current_fsgid();
1787         }
1788         return rc;
1789 }
1790
1791 static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1792 {
1793         pgoff_t index = from >> PAGE_CACHE_SHIFT;
1794         unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1795         struct page *page;
1796         int rc = 0;
1797
1798         page = grab_cache_page(mapping, index);
1799         if (!page)
1800                 return -ENOMEM;
1801
1802         zero_user_segment(page, offset, PAGE_CACHE_SIZE);
1803         unlock_page(page);
1804         page_cache_release(page);
1805         return rc;
1806 }
1807
1808 static void cifs_setsize(struct inode *inode, loff_t offset)
1809 {
1810         loff_t oldsize;
1811
1812         spin_lock(&inode->i_lock);
1813         oldsize = inode->i_size;
1814         i_size_write(inode, offset);
1815         spin_unlock(&inode->i_lock);
1816
1817         truncate_pagecache(inode, oldsize, offset);
1818 }
1819
1820 static int
1821 cifs_set_file_size(struct inode *inode, struct iattr *attrs,
1822                    unsigned int xid, char *full_path)
1823 {
1824         int rc;
1825         struct cifsFileInfo *open_file;
1826         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1827         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1828         struct tcon_link *tlink = NULL;
1829         struct cifs_tcon *pTcon = NULL;
1830         struct cifs_io_parms io_parms;
1831
1832         /*
1833          * To avoid spurious oplock breaks from server, in the case of
1834          * inodes that we already have open, avoid doing path based
1835          * setting of file size if we can do it by handle.
1836          * This keeps our caching token (oplock) and avoids timeouts
1837          * when the local oplock break takes longer to flush
1838          * writebehind data than the SMB timeout for the SetPathInfo
1839          * request would allow
1840          */
1841         open_file = find_writable_file(cifsInode, true);
1842         if (open_file) {
1843                 __u16 nfid = open_file->netfid;
1844                 __u32 npid = open_file->pid;
1845                 pTcon = tlink_tcon(open_file->tlink);
1846                 rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size, nfid,
1847                                         npid, false);
1848                 cifsFileInfo_put(open_file);
1849                 cFYI(1, "SetFSize for attrs rc = %d", rc);
1850                 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1851                         unsigned int bytes_written;
1852
1853                         io_parms.netfid = nfid;
1854                         io_parms.pid = npid;
1855                         io_parms.tcon = pTcon;
1856                         io_parms.offset = 0;
1857                         io_parms.length = attrs->ia_size;
1858                         rc = CIFSSMBWrite(xid, &io_parms, &bytes_written,
1859                                           NULL, NULL, 1);
1860                         cFYI(1, "Wrt seteof rc %d", rc);
1861                 }
1862         } else
1863                 rc = -EINVAL;
1864
1865         if (rc != 0) {
1866                 if (pTcon == NULL) {
1867                         tlink = cifs_sb_tlink(cifs_sb);
1868                         if (IS_ERR(tlink))
1869                                 return PTR_ERR(tlink);
1870                         pTcon = tlink_tcon(tlink);
1871                 }
1872
1873                 /* Set file size by pathname rather than by handle
1874                    either because no valid, writeable file handle for
1875                    it was found or because there was an error setting
1876                    it by handle */
1877                 rc = CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size,
1878                                    false, cifs_sb->local_nls,
1879                                    cifs_sb->mnt_cifs_flags &
1880                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1881                 cFYI(1, "SetEOF by path (setattrs) rc = %d", rc);
1882                 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1883                         __u16 netfid;
1884                         int oplock = 0;
1885
1886                         rc = SMBLegacyOpen(xid, pTcon, full_path,
1887                                 FILE_OPEN, GENERIC_WRITE,
1888                                 CREATE_NOT_DIR, &netfid, &oplock, NULL,
1889                                 cifs_sb->local_nls,
1890                                 cifs_sb->mnt_cifs_flags &
1891                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1892                         if (rc == 0) {
1893                                 unsigned int bytes_written;
1894
1895                                 io_parms.netfid = netfid;
1896                                 io_parms.pid = current->tgid;
1897                                 io_parms.tcon = pTcon;
1898                                 io_parms.offset = 0;
1899                                 io_parms.length = attrs->ia_size;
1900                                 rc = CIFSSMBWrite(xid, &io_parms,
1901                                                   &bytes_written,
1902                                                   NULL, NULL,  1);
1903                                 cFYI(1, "wrt seteof rc %d", rc);
1904                                 CIFSSMBClose(xid, pTcon, netfid);
1905                         }
1906                 }
1907                 if (tlink)
1908                         cifs_put_tlink(tlink);
1909         }
1910
1911         if (rc == 0) {
1912                 cifsInode->server_eof = attrs->ia_size;
1913                 cifs_setsize(inode, attrs->ia_size);
1914                 cifs_truncate_page(inode->i_mapping, inode->i_size);
1915         }
1916
1917         return rc;
1918 }
1919
1920 static int
1921 cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
1922 {
1923         int rc;
1924         unsigned int xid;
1925         char *full_path = NULL;
1926         struct inode *inode = direntry->d_inode;
1927         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1928         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1929         struct tcon_link *tlink;
1930         struct cifs_tcon *pTcon;
1931         struct cifs_unix_set_info_args *args = NULL;
1932         struct cifsFileInfo *open_file;
1933
1934         cFYI(1, "setattr_unix on file %s attrs->ia_valid=0x%x",
1935                  direntry->d_name.name, attrs->ia_valid);
1936
1937         xid = get_xid();
1938
1939         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
1940                 attrs->ia_valid |= ATTR_FORCE;
1941
1942         rc = inode_change_ok(inode, attrs);
1943         if (rc < 0)
1944                 goto out;
1945
1946         full_path = build_path_from_dentry(direntry);
1947         if (full_path == NULL) {
1948                 rc = -ENOMEM;
1949                 goto out;
1950         }
1951
1952         /*
1953          * Attempt to flush data before changing attributes. We need to do
1954          * this for ATTR_SIZE and ATTR_MTIME for sure, and if we change the
1955          * ownership or mode then we may also need to do this. Here, we take
1956          * the safe way out and just do the flush on all setattr requests. If
1957          * the flush returns error, store it to report later and continue.
1958          *
1959          * BB: This should be smarter. Why bother flushing pages that
1960          * will be truncated anyway? Also, should we error out here if
1961          * the flush returns error?
1962          */
1963         rc = filemap_write_and_wait(inode->i_mapping);
1964         mapping_set_error(inode->i_mapping, rc);
1965         rc = 0;
1966
1967         if (attrs->ia_valid & ATTR_SIZE) {
1968                 rc = cifs_set_file_size(inode, attrs, xid, full_path);
1969                 if (rc != 0)
1970                         goto out;
1971         }
1972
1973         /* skip mode change if it's just for clearing setuid/setgid */
1974         if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
1975                 attrs->ia_valid &= ~ATTR_MODE;
1976
1977         args = kmalloc(sizeof(*args), GFP_KERNEL);
1978         if (args == NULL) {
1979                 rc = -ENOMEM;
1980                 goto out;
1981         }
1982
1983         /* set up the struct */
1984         if (attrs->ia_valid & ATTR_MODE)
1985                 args->mode = attrs->ia_mode;
1986         else
1987                 args->mode = NO_CHANGE_64;
1988
1989         if (attrs->ia_valid & ATTR_UID)
1990                 args->uid = attrs->ia_uid;
1991         else
1992                 args->uid = NO_CHANGE_64;
1993
1994         if (attrs->ia_valid & ATTR_GID)
1995                 args->gid = attrs->ia_gid;
1996         else
1997                 args->gid = NO_CHANGE_64;
1998
1999         if (attrs->ia_valid & ATTR_ATIME)
2000                 args->atime = cifs_UnixTimeToNT(attrs->ia_atime);
2001         else
2002                 args->atime = NO_CHANGE_64;
2003
2004         if (attrs->ia_valid & ATTR_MTIME)
2005                 args->mtime = cifs_UnixTimeToNT(attrs->ia_mtime);
2006         else
2007                 args->mtime = NO_CHANGE_64;
2008
2009         if (attrs->ia_valid & ATTR_CTIME)
2010                 args->ctime = cifs_UnixTimeToNT(attrs->ia_ctime);
2011         else
2012                 args->ctime = NO_CHANGE_64;
2013
2014         args->device = 0;
2015         open_file = find_writable_file(cifsInode, true);
2016         if (open_file) {
2017                 u16 nfid = open_file->netfid;
2018                 u32 npid = open_file->pid;
2019                 pTcon = tlink_tcon(open_file->tlink);
2020                 rc = CIFSSMBUnixSetFileInfo(xid, pTcon, args, nfid, npid);
2021                 cifsFileInfo_put(open_file);
2022         } else {
2023                 tlink = cifs_sb_tlink(cifs_sb);
2024                 if (IS_ERR(tlink)) {
2025                         rc = PTR_ERR(tlink);
2026                         goto out;
2027                 }
2028                 pTcon = tlink_tcon(tlink);
2029                 rc = CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, args,
2030                                     cifs_sb->local_nls,
2031                                     cifs_sb->mnt_cifs_flags &
2032                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
2033                 cifs_put_tlink(tlink);
2034         }
2035
2036         if (rc)
2037                 goto out;
2038
2039         if ((attrs->ia_valid & ATTR_SIZE) &&
2040             attrs->ia_size != i_size_read(inode))
2041                 truncate_setsize(inode, attrs->ia_size);
2042
2043         setattr_copy(inode, attrs);
2044         mark_inode_dirty(inode);
2045
2046         /* force revalidate when any of these times are set since some
2047            of the fs types (eg ext3, fat) do not have fine enough
2048            time granularity to match protocol, and we do not have a
2049            a way (yet) to query the server fs's time granularity (and
2050            whether it rounds times down).
2051         */
2052         if (attrs->ia_valid & (ATTR_MTIME | ATTR_CTIME))
2053                 cifsInode->time = 0;
2054 out:
2055         kfree(args);
2056         kfree(full_path);
2057         free_xid(xid);
2058         return rc;
2059 }
2060
2061 static int
2062 cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
2063 {
2064         unsigned int xid;
2065         uid_t uid = NO_CHANGE_32;
2066         gid_t gid = NO_CHANGE_32;
2067         struct inode *inode = direntry->d_inode;
2068         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2069         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
2070         char *full_path = NULL;
2071         int rc = -EACCES;
2072         __u32 dosattr = 0;
2073         __u64 mode = NO_CHANGE_64;
2074
2075         xid = get_xid();
2076
2077         cFYI(1, "setattr on file %s attrs->iavalid 0x%x",
2078                  direntry->d_name.name, attrs->ia_valid);
2079
2080         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
2081                 attrs->ia_valid |= ATTR_FORCE;
2082
2083         rc = inode_change_ok(inode, attrs);
2084         if (rc < 0) {
2085                 free_xid(xid);
2086                 return rc;
2087         }
2088
2089         full_path = build_path_from_dentry(direntry);
2090         if (full_path == NULL) {
2091                 rc = -ENOMEM;
2092                 free_xid(xid);
2093                 return rc;
2094         }
2095
2096         /*
2097          * Attempt to flush data before changing attributes. We need to do
2098          * this for ATTR_SIZE and ATTR_MTIME for sure, and if we change the
2099          * ownership or mode then we may also need to do this. Here, we take
2100          * the safe way out and just do the flush on all setattr requests. If
2101          * the flush returns error, store it to report later and continue.
2102          *
2103          * BB: This should be smarter. Why bother flushing pages that
2104          * will be truncated anyway? Also, should we error out here if
2105          * the flush returns error?
2106          */
2107         rc = filemap_write_and_wait(inode->i_mapping);
2108         mapping_set_error(inode->i_mapping, rc);
2109         rc = 0;
2110
2111         if (attrs->ia_valid & ATTR_SIZE) {
2112                 rc = cifs_set_file_size(inode, attrs, xid, full_path);
2113                 if (rc != 0)
2114                         goto cifs_setattr_exit;
2115         }
2116
2117         if (attrs->ia_valid & ATTR_UID)
2118                 uid = attrs->ia_uid;
2119
2120         if (attrs->ia_valid & ATTR_GID)
2121                 gid = attrs->ia_gid;
2122
2123 #ifdef CONFIG_CIFS_ACL
2124         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
2125                 if (uid != NO_CHANGE_32 || gid != NO_CHANGE_32) {
2126                         rc = id_mode_to_cifs_acl(inode, full_path, NO_CHANGE_64,
2127                                                         uid, gid);
2128                         if (rc) {
2129                                 cFYI(1, "%s: Setting id failed with error: %d",
2130                                         __func__, rc);
2131                                 goto cifs_setattr_exit;
2132                         }
2133                 }
2134         } else
2135 #endif /* CONFIG_CIFS_ACL */
2136         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID))
2137                 attrs->ia_valid &= ~(ATTR_UID | ATTR_GID);
2138
2139         /* skip mode change if it's just for clearing setuid/setgid */
2140         if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
2141                 attrs->ia_valid &= ~ATTR_MODE;
2142
2143         if (attrs->ia_valid & ATTR_MODE) {
2144                 mode = attrs->ia_mode;
2145                 rc = 0;
2146 #ifdef CONFIG_CIFS_ACL
2147                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
2148                         rc = id_mode_to_cifs_acl(inode, full_path, mode,
2149                                                 NO_CHANGE_32, NO_CHANGE_32);
2150                         if (rc) {
2151                                 cFYI(1, "%s: Setting ACL failed with error: %d",
2152                                         __func__, rc);
2153                                 goto cifs_setattr_exit;
2154                         }
2155                 } else
2156 #endif /* CONFIG_CIFS_ACL */
2157                 if (((mode & S_IWUGO) == 0) &&
2158                     (cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
2159
2160                         dosattr = cifsInode->cifsAttrs | ATTR_READONLY;
2161
2162                         /* fix up mode if we're not using dynperm */
2163                         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
2164                                 attrs->ia_mode = inode->i_mode & ~S_IWUGO;
2165                 } else if ((mode & S_IWUGO) &&
2166                            (cifsInode->cifsAttrs & ATTR_READONLY)) {
2167
2168                         dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
2169                         /* Attributes of 0 are ignored */
2170                         if (dosattr == 0)
2171                                 dosattr |= ATTR_NORMAL;
2172
2173                         /* reset local inode permissions to normal */
2174                         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
2175                                 attrs->ia_mode &= ~(S_IALLUGO);
2176                                 if (S_ISDIR(inode->i_mode))
2177                                         attrs->ia_mode |=
2178                                                 cifs_sb->mnt_dir_mode;
2179                                 else
2180                                         attrs->ia_mode |=
2181                                                 cifs_sb->mnt_file_mode;
2182                         }
2183                 } else if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
2184                         /* ignore mode change - ATTR_READONLY hasn't changed */
2185                         attrs->ia_valid &= ~ATTR_MODE;
2186                 }
2187         }
2188
2189         if (attrs->ia_valid & (ATTR_MTIME|ATTR_ATIME|ATTR_CTIME) ||
2190             ((attrs->ia_valid & ATTR_MODE) && dosattr)) {
2191                 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
2192                 /* BB: check for rc = -EOPNOTSUPP and switch to legacy mode */
2193
2194                 /* Even if error on time set, no sense failing the call if
2195                 the server would set the time to a reasonable value anyway,
2196                 and this check ensures that we are not being called from
2197                 sys_utimes in which case we ought to fail the call back to
2198                 the user when the server rejects the call */
2199                 if ((rc) && (attrs->ia_valid &
2200                                 (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
2201                         rc = 0;
2202         }
2203
2204         /* do not need local check to inode_check_ok since the server does
2205            that */
2206         if (rc)
2207                 goto cifs_setattr_exit;
2208
2209         if ((attrs->ia_valid & ATTR_SIZE) &&
2210             attrs->ia_size != i_size_read(inode))
2211                 truncate_setsize(inode, attrs->ia_size);
2212
2213         setattr_copy(inode, attrs);
2214         mark_inode_dirty(inode);
2215
2216 cifs_setattr_exit:
2217         kfree(full_path);
2218         free_xid(xid);
2219         return rc;
2220 }
2221
2222 int
2223 cifs_setattr(struct dentry *direntry, struct iattr *attrs)
2224 {
2225         struct inode *inode = direntry->d_inode;
2226         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2227         struct cifs_tcon *pTcon = cifs_sb_master_tcon(cifs_sb);
2228
2229         if (pTcon->unix_ext)
2230                 return cifs_setattr_unix(direntry, attrs);
2231
2232         return cifs_setattr_nounix(direntry, attrs);
2233
2234         /* BB: add cifs_setattr_legacy for really old servers */
2235 }
2236
2237 #if 0
2238 void cifs_delete_inode(struct inode *inode)
2239 {
2240         cFYI(1, "In cifs_delete_inode, inode = 0x%p", inode);
2241         /* may have to add back in if and when safe distributed caching of
2242            directories added e.g. via FindNotify */
2243 }
2244 #endif