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         inode->i_nlink = 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         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 cifsTconInfo *tcon = tlink_tcon(cfile->tlink);
 299
 300         xid = GetXid();
 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         FreeXid(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, int xid)
 317 {
 318         int rc;
 319         FILE_UNIX_BASIC_INFO find_data;
 320         struct cifs_fattr fattr;
 321         struct cifsTconInfo *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, int xid)
 371 {
 372         int rc;
 373         int oplock = 0;
 374         __u16 netfid;
 375         struct tcon_link *tlink;
 376         struct cifsTconInfo *tcon;
 377         char buf[24];
 378         unsigned int bytes_read;
 379         char *pbuf;
 380
 381         pbuf = buf;
 382
 383         fattr->cf_mode &= ~S_IFMT;
 384
 385         if (fattr->cf_eof == 0) {
 386                 fattr->cf_mode |= S_IFIFO;
 387                 fattr->cf_dtype = DT_FIFO;
 388                 return 0;
 389         } else if (fattr->cf_eof < 8) {
 390                 fattr->cf_mode |= S_IFREG;
 391                 fattr->cf_dtype = DT_REG;
 392                 return -EINVAL;  /* EOPNOTSUPP? */
 393         }
 394
 395         tlink = cifs_sb_tlink(cifs_sb);
 396         if (IS_ERR(tlink))
 397                 return PTR_ERR(tlink);
 398         tcon = tlink_tcon(tlink);
 399
 400         rc = CIFSSMBOpen(xid, tcon, path, FILE_OPEN, GENERIC_READ,
 401                          CREATE_NOT_DIR, &netfid, &oplock, NULL,
 402                          cifs_sb->local_nls,
 403                          cifs_sb->mnt_cifs_flags &
 404                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 405         if (rc == 0) {
 406                 int buf_type = CIFS_NO_BUFFER;
 407                         /* Read header */
 408                 rc = CIFSSMBRead(xid, tcon, netfid,
 409                                  24 /* length */, 0 /* offset */,
 410                                  &bytes_read, &pbuf, &buf_type);
 411                 if ((rc == 0) && (bytes_read >= 8)) {
 412                         if (memcmp("IntxBLK", pbuf, 8) == 0) {
 413                                 cFYI(1, "Block device");
 414                                 fattr->cf_mode |= S_IFBLK;
 415                                 fattr->cf_dtype = DT_BLK;
 416                                 if (bytes_read == 24) {
 417                                         /* we have enough to decode dev num */
 418                                         __u64 mjr; /* major */
 419                                         __u64 mnr; /* minor */
 420                                         mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
 421                                         mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
 422                                         fattr->cf_rdev = MKDEV(mjr, mnr);
 423                                 }
 424                         } else if (memcmp("IntxCHR", pbuf, 8) == 0) {
 425                                 cFYI(1, "Char device");
 426                                 fattr->cf_mode |= S_IFCHR;
 427                                 fattr->cf_dtype = DT_CHR;
 428                                 if (bytes_read == 24) {
 429                                         /* we have enough to decode dev num */
 430                                         __u64 mjr; /* major */
 431                                         __u64 mnr; /* minor */
 432                                         mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
 433                                         mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
 434                                         fattr->cf_rdev = MKDEV(mjr, mnr);
 435                                 }
 436                         } else if (memcmp("IntxLNK", pbuf, 7) == 0) {
 437                                 cFYI(1, "Symlink");
 438                                 fattr->cf_mode |= S_IFLNK;
 439                                 fattr->cf_dtype = DT_LNK;
 440                         } else {
 441                                 fattr->cf_mode |= S_IFREG; /* file? */
 442                                 fattr->cf_dtype = DT_REG;
 443                                 rc = -EOPNOTSUPP;
 444                         }
 445                 } else {
 446                         fattr->cf_mode |= S_IFREG; /* then it is a file */
 447                         fattr->cf_dtype = DT_REG;
 448                         rc = -EOPNOTSUPP; /* or some unknown SFU type */
 449                 }
 450                 CIFSSMBClose(xid, tcon, netfid);
 451         }
 452         cifs_put_tlink(tlink);
 453         return rc;
 454 }
 455
 456 #define SFBITS_MASK (S_ISVTX | S_ISGID | S_ISUID)  /* SETFILEBITS valid bits */
 457
 458 /*
 459  * Fetch mode bits as provided by SFU.
 460  *
 461  * FIXME: Doesn't this clobber the type bit we got from cifs_sfu_type ?
 462  */
 463 static int cifs_sfu_mode(struct cifs_fattr *fattr, const unsigned char *path,
 464                          struct cifs_sb_info *cifs_sb, int xid)
 465 {
 466 #ifdef CONFIG_CIFS_XATTR
 467         ssize_t rc;
 468         char ea_value[4];
 469         __u32 mode;
 470         struct tcon_link *tlink;
 471         struct cifsTconInfo *tcon;
 472
 473         tlink = cifs_sb_tlink(cifs_sb);
 474         if (IS_ERR(tlink))
 475                 return PTR_ERR(tlink);
 476         tcon = tlink_tcon(tlink);
 477
 478         rc = CIFSSMBQAllEAs(xid, tcon, path, "SETFILEBITS",
 479                             ea_value, 4 /* size of buf */, cifs_sb->local_nls,
 480                             cifs_sb->mnt_cifs_flags &
 481                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 482         cifs_put_tlink(tlink);
 483         if (rc < 0)
 484                 return (int)rc;
 485         else if (rc > 3) {
 486                 mode = le32_to_cpu(*((__le32 *)ea_value));
 487                 fattr->cf_mode &= ~SFBITS_MASK;
 488                 cFYI(1, "special bits 0%o org mode 0%o", mode,
 489                          fattr->cf_mode);
 490                 fattr->cf_mode = (mode & SFBITS_MASK) | fattr->cf_mode;
 491                 cFYI(1, "special mode bits 0%o", mode);
 492         }
 493
 494         return 0;
 495 #else
 496         return -EOPNOTSUPP;
 497 #endif
 498 }
 499
 500 /* Fill a cifs_fattr struct with info from FILE_ALL_INFO */
 501 static void
 502 cifs_all_info_to_fattr(struct cifs_fattr *fattr, FILE_ALL_INFO *info,
 503                        struct cifs_sb_info *cifs_sb, bool adjust_tz)
 504 {
 505         struct cifsTconInfo *tcon = cifs_sb_master_tcon(cifs_sb);
 506
 507         memset(fattr, 0, sizeof(*fattr));
 508         fattr->cf_cifsattrs = le32_to_cpu(info->Attributes);
 509         if (info->DeletePending)
 510                 fattr->cf_flags |= CIFS_FATTR_DELETE_PENDING;
 511
 512         if (info->LastAccessTime)
 513                 fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
 514         else
 515                 fattr->cf_atime = CURRENT_TIME;
 516
 517         fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime);
 518         fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
 519
 520         if (adjust_tz) {
 521                 fattr->cf_ctime.tv_sec += tcon->ses->server->timeAdj;
 522                 fattr->cf_mtime.tv_sec += tcon->ses->server->timeAdj;
 523         }
 524
 525         fattr->cf_eof = le64_to_cpu(info->EndOfFile);
 526         fattr->cf_bytes = le64_to_cpu(info->AllocationSize);
 527         fattr->cf_createtime = le64_to_cpu(info->CreationTime);
 528
 529         if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
 530                 fattr->cf_mode = S_IFDIR | cifs_sb->mnt_dir_mode;
 531                 fattr->cf_dtype = DT_DIR;
 532         } else {
 533                 fattr->cf_mode = S_IFREG | cifs_sb->mnt_file_mode;
 534                 fattr->cf_dtype = DT_REG;
 535
 536                 /* clear write bits if ATTR_READONLY is set */
 537                 if (fattr->cf_cifsattrs & ATTR_READONLY)
 538                         fattr->cf_mode &= ~(S_IWUGO);
 539         }
 540
 541         fattr->cf_nlink = le32_to_cpu(info->NumberOfLinks);
 542
 543         fattr->cf_uid = cifs_sb->mnt_uid;
 544         fattr->cf_gid = cifs_sb->mnt_gid;
 545 }
 546
 547 int cifs_get_file_info(struct file *filp)
 548 {
 549         int rc;
 550         int xid;
 551         FILE_ALL_INFO find_data;
 552         struct cifs_fattr fattr;
 553         struct inode *inode = filp->f_path.dentry->d_inode;
 554         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 555         struct cifsFileInfo *cfile = filp->private_data;
 556         struct cifsTconInfo *tcon = tlink_tcon(cfile->tlink);
 557
 558         xid = GetXid();
 559         rc = CIFSSMBQFileInfo(xid, tcon, cfile->netfid, &find_data);
 560         if (rc == -EOPNOTSUPP || rc == -EINVAL) {
 561                 /*
 562                  * FIXME: legacy server -- fall back to path-based call?
 563                  * for now, just skip revalidating and mark inode for
 564                  * immediate reval.
 565                  */
 566                 rc = 0;
 567                 CIFS_I(inode)->time = 0;
 568                 goto cgfi_exit;
 569         } else if (rc == -EREMOTE) {
 570                 cifs_create_dfs_fattr(&fattr, inode->i_sb);
 571                 rc = 0;
 572         } else if (rc)
 573                 goto cgfi_exit;
 574
 575         /*
 576          * don't bother with SFU junk here -- just mark inode as needing
 577          * revalidation.
 578          */
 579         cifs_all_info_to_fattr(&fattr, &find_data, cifs_sb, false);
 580         fattr.cf_uniqueid = CIFS_I(inode)->uniqueid;
 581         fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
 582         cifs_fattr_to_inode(inode, &fattr);
 583 cgfi_exit:
 584         FreeXid(xid);
 585         return rc;
 586 }
 587
 588 int cifs_get_inode_info(struct inode **pinode,
 589         const unsigned char *full_path, FILE_ALL_INFO *pfindData,
 590         struct super_block *sb, int xid, const __u16 *pfid)
 591 {
 592         int rc = 0, tmprc;
 593         struct cifsTconInfo *pTcon;
 594         struct tcon_link *tlink;
 595         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 596         char *buf = NULL;
 597         bool adjustTZ = false;
 598         struct cifs_fattr fattr;
 599
 600         tlink = cifs_sb_tlink(cifs_sb);
 601         if (IS_ERR(tlink))
 602                 return PTR_ERR(tlink);
 603         pTcon = tlink_tcon(tlink);
 604
 605         cFYI(1, "Getting info on %s", full_path);
 606
 607         if ((pfindData == NULL) && (*pinode != NULL)) {
 608                 if (CIFS_I(*pinode)->clientCanCacheRead) {
 609                         cFYI(1, "No need to revalidate cached inode sizes");
 610                         goto cgii_exit;
 611                 }
 612         }
 613
 614         /* if file info not passed in then get it from server */
 615         if (pfindData == NULL) {
 616                 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
 617                 if (buf == NULL) {
 618                         rc = -ENOMEM;
 619                         goto cgii_exit;
 620                 }
 621                 pfindData = (FILE_ALL_INFO *)buf;
 622
 623                 /* could do find first instead but this returns more info */
 624                 rc = CIFSSMBQPathInfo(xid, pTcon, full_path, pfindData,
 625                               0 /* not legacy */,
 626                               cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
 627                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 628                 /* BB optimize code so we do not make the above call
 629                 when server claims no NT SMB support and the above call
 630                 failed at least once - set flag in tcon or mount */
 631                 if ((rc == -EOPNOTSUPP) || (rc == -EINVAL)) {
 632                         rc = SMBQueryInformation(xid, pTcon, full_path,
 633                                         pfindData, cifs_sb->local_nls,
 634                                         cifs_sb->mnt_cifs_flags &
 635                                           CIFS_MOUNT_MAP_SPECIAL_CHR);
 636                         adjustTZ = true;
 637                 }
 638         }
 639
 640         if (!rc) {
 641                 cifs_all_info_to_fattr(&fattr, (FILE_ALL_INFO *) pfindData,
 642                                        cifs_sb, adjustTZ);
 643         } else if (rc == -EREMOTE) {
 644                 cifs_create_dfs_fattr(&fattr, sb);
 645                 rc = 0;
 646         } else {
 647                 goto cgii_exit;
 648         }
 649
 650         /*
 651          * If an inode wasn't passed in, then get the inode number
 652          *
 653          * Is an i_ino of zero legal? Can we use that to check if the server
 654          * supports returning inode numbers?  Are there other sanity checks we
 655          * can use to ensure that the server is really filling in that field?
 656          *
 657          * We can not use the IndexNumber field by default from Windows or
 658          * Samba (in ALL_INFO buf) but we can request it explicitly. The SNIA
 659          * CIFS spec claims that this value is unique within the scope of a
 660          * share, and the windows docs hint that it's actually unique
 661          * per-machine.
 662          *
 663          * There may be higher info levels that work but are there Windows
 664          * server or network appliances for which IndexNumber field is not
 665          * guaranteed unique?
 666          */
 667         if (*pinode == NULL) {
 668                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 669                         int rc1 = 0;
 670
 671                         rc1 = CIFSGetSrvInodeNumber(xid, pTcon,
 672                                         full_path, &fattr.cf_uniqueid,
 673                                         cifs_sb->local_nls,
 674                                         cifs_sb->mnt_cifs_flags &
 675                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 676                         if (rc1 || !fattr.cf_uniqueid) {
 677                                 cFYI(1, "GetSrvInodeNum rc %d", rc1);
 678                                 fattr.cf_uniqueid = iunique(sb, ROOT_I);
 679                                 cifs_autodisable_serverino(cifs_sb);
 680                         }
 681                 } else {
 682                         fattr.cf_uniqueid = iunique(sb, ROOT_I);
 683                 }
 684         } else {
 685                 fattr.cf_uniqueid = CIFS_I(*pinode)->uniqueid;
 686         }
 687
 688         /* query for SFU type info if supported and needed */
 689         if (fattr.cf_cifsattrs & ATTR_SYSTEM &&
 690             cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
 691                 tmprc = cifs_sfu_type(&fattr, full_path, cifs_sb, xid);
 692                 if (tmprc)
 693                         cFYI(1, "cifs_sfu_type failed: %d", tmprc);
 694         }
 695
 696 #ifdef CONFIG_CIFS_ACL
 697         /* fill in 0777 bits from ACL */
 698         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
 699                 rc = cifs_acl_to_fattr(cifs_sb, &fattr, *pinode, full_path,
 700                                                 pfid);
 701                 if (rc) {
 702                         cFYI(1, "%s: Getting ACL failed with error: %d",
 703                                 __func__, rc);
 704                         goto cgii_exit;
 705                 }
 706         }
 707 #endif /* CONFIG_CIFS_ACL */
 708
 709         /* fill in remaining high mode bits e.g. SUID, VTX */
 710         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
 711                 cifs_sfu_mode(&fattr, full_path, cifs_sb, xid);
 712
 713         /* check for Minshall+French symlinks */
 714         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
 715                 tmprc = CIFSCheckMFSymlink(&fattr, full_path, cifs_sb, xid);
 716                 if (tmprc)
 717                         cFYI(1, "CIFSCheckMFSymlink: %d", tmprc);
 718         }
 719
 720         if (!*pinode) {
 721                 *pinode = cifs_iget(sb, &fattr);
 722                 if (!*pinode)
 723                         rc = -ENOMEM;
 724         } else {
 725                 cifs_fattr_to_inode(*pinode, &fattr);
 726         }
 727
 728 cgii_exit:
 729         kfree(buf);
 730         cifs_put_tlink(tlink);
 731         return rc;
 732 }
 733
 734 static const struct inode_operations cifs_ipc_inode_ops = {
 735         .lookup = cifs_lookup,
 736 };
 737
 738 char *cifs_build_path_to_root(struct cifs_sb_info *cifs_sb,
 739                                 struct cifsTconInfo *tcon)
 740 {
 741         int pplen = cifs_sb->prepathlen;
 742         int dfsplen;
 743         char *full_path = NULL;
 744
 745         /* if no prefix path, simply set path to the root of share to "" */
 746         if (pplen == 0) {
 747                 full_path = kmalloc(1, GFP_KERNEL);
 748                 if (full_path)
 749                         full_path[0] = 0;
 750                 return full_path;
 751         }
 752
 753         if (tcon->Flags & SMB_SHARE_IS_IN_DFS)
 754                 dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
 755         else
 756                 dfsplen = 0;
 757
 758         full_path = kmalloc(dfsplen + pplen + 1, GFP_KERNEL);
 759         if (full_path == NULL)
 760                 return full_path;
 761
 762         if (dfsplen) {
 763                 strncpy(full_path, tcon->treeName, dfsplen);
 764                 /* switch slash direction in prepath depending on whether
 765                  * windows or posix style path names
 766                  */
 767                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
 768                         int i;
 769                         for (i = 0; i < dfsplen; i++) {
 770                                 if (full_path[i] == '\\')
 771                                         full_path[i] = '/';
 772                         }
 773                 }
 774         }
 775         strncpy(full_path + dfsplen, cifs_sb->prepath, pplen);
 776         full_path[dfsplen + pplen] = 0; /* add trailing null */
 777         return full_path;
 778 }
 779
 780 static int
 781 cifs_find_inode(struct inode *inode, void *opaque)
 782 {
 783         struct cifs_fattr *fattr = (struct cifs_fattr *) opaque;
 784
 785         /* don't match inode with different uniqueid */
 786         if (CIFS_I(inode)->uniqueid != fattr->cf_uniqueid)
 787                 return 0;
 788
 789         /* use createtime like an i_generation field */
 790         if (CIFS_I(inode)->createtime != fattr->cf_createtime)
 791                 return 0;
 792
 793         /* don't match inode of different type */
 794         if ((inode->i_mode & S_IFMT) != (fattr->cf_mode & S_IFMT))
 795                 return 0;
 796
 797         /* if it's not a directory or has no dentries, then flag it */
 798         if (S_ISDIR(inode->i_mode) && !list_empty(&inode->i_dentry))
 799                 fattr->cf_flags |= CIFS_FATTR_INO_COLLISION;
 800
 801         return 1;
 802 }
 803
 804 static int
 805 cifs_init_inode(struct inode *inode, void *opaque)
 806 {
 807         struct cifs_fattr *fattr = (struct cifs_fattr *) opaque;
 808
 809         CIFS_I(inode)->uniqueid = fattr->cf_uniqueid;
 810         CIFS_I(inode)->createtime = fattr->cf_createtime;
 811         return 0;
 812 }
 813
 814 /*
 815  * walk dentry list for an inode and report whether it has aliases that
 816  * are hashed. We use this to determine if a directory inode can actually
 817  * be used.
 818  */
 819 static bool
 820 inode_has_hashed_dentries(struct inode *inode)
 821 {
 822         struct dentry *dentry;
 823
 824         spin_lock(&inode->i_lock);
 825         list_for_each_entry(dentry, &inode->i_dentry, d_alias) {
 826                 if (!d_unhashed(dentry) || IS_ROOT(dentry)) {
 827                         spin_unlock(&inode->i_lock);
 828                         return true;
 829                 }
 830         }
 831         spin_unlock(&inode->i_lock);
 832         return false;
 833 }
 834
 835 /* Given fattrs, get a corresponding inode */
 836 struct inode *
 837 cifs_iget(struct super_block *sb, struct cifs_fattr *fattr)
 838 {
 839         unsigned long hash;
 840         struct inode *inode;
 841
 842 retry_iget5_locked:
 843         cFYI(1, "looking for uniqueid=%llu", fattr->cf_uniqueid);
 844
 845         /* hash down to 32-bits on 32-bit arch */
 846         hash = cifs_uniqueid_to_ino_t(fattr->cf_uniqueid);
 847
 848         inode = iget5_locked(sb, hash, cifs_find_inode, cifs_init_inode, fattr);
 849         if (inode) {
 850                 /* was there a potentially problematic inode collision? */
 851                 if (fattr->cf_flags & CIFS_FATTR_INO_COLLISION) {
 852                         fattr->cf_flags &= ~CIFS_FATTR_INO_COLLISION;
 853
 854                         if (inode_has_hashed_dentries(inode)) {
 855                                 cifs_autodisable_serverino(CIFS_SB(sb));
 856                                 iput(inode);
 857                                 fattr->cf_uniqueid = iunique(sb, ROOT_I);
 858                                 goto retry_iget5_locked;
 859                         }
 860                 }
 861
 862                 cifs_fattr_to_inode(inode, fattr);
 863                 if (sb->s_flags & MS_NOATIME)
 864                         inode->i_flags |= S_NOATIME | S_NOCMTIME;
 865                 if (inode->i_state & I_NEW) {
 866                         inode->i_ino = hash;
 867                         if (S_ISREG(inode->i_mode))
 868                                 inode->i_data.backing_dev_info = sb->s_bdi;
 869 #ifdef CONFIG_CIFS_FSCACHE
 870                         /* initialize per-inode cache cookie pointer */
 871                         CIFS_I(inode)->fscache = NULL;
 872 #endif
 873                         unlock_new_inode(inode);
 874                 }
 875         }
 876
 877         return inode;
 878 }
 879
 880 /* gets root inode */
 881 struct inode *cifs_root_iget(struct super_block *sb, unsigned long ino)
 882 {
 883         int xid;
 884         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 885         struct inode *inode = NULL;
 886         long rc;
 887         char *full_path;
 888         struct cifsTconInfo *tcon = cifs_sb_master_tcon(cifs_sb);
 889
 890         full_path = cifs_build_path_to_root(cifs_sb, tcon);
 891         if (full_path == NULL)
 892                 return ERR_PTR(-ENOMEM);
 893
 894         xid = GetXid();
 895         if (tcon->unix_ext)
 896                 rc = cifs_get_inode_info_unix(&inode, full_path, sb, xid);
 897         else
 898                 rc = cifs_get_inode_info(&inode, full_path, NULL, sb,
 899                                                 xid, NULL);
 900
 901         if (!inode) {
 902                 inode = ERR_PTR(rc);
 903                 goto out;
 904         }
 905
 906 #ifdef CONFIG_CIFS_FSCACHE
 907         /* populate tcon->resource_id */
 908         tcon->resource_id = CIFS_I(inode)->uniqueid;
 909 #endif
 910
 911         if (rc && tcon->ipc) {
 912                 cFYI(1, "ipc connection - fake read inode");
 913                 inode->i_mode |= S_IFDIR;
 914                 inode->i_nlink = 2;
 915                 inode->i_op = &cifs_ipc_inode_ops;
 916                 inode->i_fop = &simple_dir_operations;
 917                 inode->i_uid = cifs_sb->mnt_uid;
 918                 inode->i_gid = cifs_sb->mnt_gid;
 919         } else if (rc) {
 920                 iget_failed(inode);
 921                 inode = ERR_PTR(rc);
 922         }
 923
 924 out:
 925         kfree(full_path);
 926         /* can not call macro FreeXid here since in a void func
 927          * TODO: This is no longer true
 928          */
 929         _FreeXid(xid);
 930         return inode;
 931 }
 932
 933 static int
 934 cifs_set_file_info(struct inode *inode, struct iattr *attrs, int xid,
 935                     char *full_path, __u32 dosattr)
 936 {
 937         int rc;
 938         int oplock = 0;
 939         __u16 netfid;
 940         __u32 netpid;
 941         bool set_time = false;
 942         struct cifsFileInfo *open_file;
 943         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
 944         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 945         struct tcon_link *tlink = NULL;
 946         struct cifsTconInfo *pTcon;
 947         FILE_BASIC_INFO info_buf;
 948
 949         if (attrs == NULL)
 950                 return -EINVAL;
 951
 952         if (attrs->ia_valid & ATTR_ATIME) {
 953                 set_time = true;
 954                 info_buf.LastAccessTime =
 955                         cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
 956         } else
 957                 info_buf.LastAccessTime = 0;
 958
 959         if (attrs->ia_valid & ATTR_MTIME) {
 960                 set_time = true;
 961                 info_buf.LastWriteTime =
 962                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
 963         } else
 964                 info_buf.LastWriteTime = 0;
 965
 966         /*
 967          * Samba throws this field away, but windows may actually use it.
 968          * Do not set ctime unless other time stamps are changed explicitly
 969          * (i.e. by utimes()) since we would then have a mix of client and
 970          * server times.
 971          */
 972         if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
 973                 cFYI(1, "CIFS - CTIME changed");
 974                 info_buf.ChangeTime =
 975                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
 976         } else
 977                 info_buf.ChangeTime = 0;
 978
 979         info_buf.CreationTime = 0;      /* don't change */
 980         info_buf.Attributes = cpu_to_le32(dosattr);
 981
 982         /*
 983          * If the file is already open for write, just use that fileid
 984          */
 985         open_file = find_writable_file(cifsInode, true);
 986         if (open_file) {
 987                 netfid = open_file->netfid;
 988                 netpid = open_file->pid;
 989                 pTcon = tlink_tcon(open_file->tlink);
 990                 goto set_via_filehandle;
 991         }
 992
 993         tlink = cifs_sb_tlink(cifs_sb);
 994         if (IS_ERR(tlink)) {
 995                 rc = PTR_ERR(tlink);
 996                 tlink = NULL;
 997                 goto out;
 998         }
 999         pTcon = tlink_tcon(tlink);
1000
1001         /*
1002          * NT4 apparently returns success on this call, but it doesn't
1003          * really work.
1004          */
1005         if (!(pTcon->ses->flags & CIFS_SES_NT4)) {
1006                 rc = CIFSSMBSetPathInfo(xid, pTcon, full_path,
1007                                      &info_buf, cifs_sb->local_nls,
1008                                      cifs_sb->mnt_cifs_flags &
1009                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1010                 if (rc == 0) {
1011                         cifsInode->cifsAttrs = dosattr;
1012                         goto out;
1013                 } else if (rc != -EOPNOTSUPP && rc != -EINVAL)
1014                         goto out;
1015         }
1016
1017         cFYI(1, "calling SetFileInfo since SetPathInfo for "
1018                  "times not supported by this server");
1019         rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
1020                          SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
1021                          CREATE_NOT_DIR, &netfid, &oplock,
1022                          NULL, cifs_sb->local_nls,
1023                          cifs_sb->mnt_cifs_flags &
1024                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1025
1026         if (rc != 0) {
1027                 if (rc == -EIO)
1028                         rc = -EINVAL;
1029                 goto out;
1030         }
1031
1032         netpid = current->tgid;
1033
1034 set_via_filehandle:
1035         rc = CIFSSMBSetFileInfo(xid, pTcon, &info_buf, netfid, netpid);
1036         if (!rc)
1037                 cifsInode->cifsAttrs = dosattr;
1038
1039         if (open_file == NULL)
1040                 CIFSSMBClose(xid, pTcon, netfid);
1041         else
1042                 cifsFileInfo_put(open_file);
1043 out:
1044         if (tlink != NULL)
1045                 cifs_put_tlink(tlink);
1046         return rc;
1047 }
1048
1049 /*
1050  * open the given file (if it isn't already), set the DELETE_ON_CLOSE bit
1051  * and rename it to a random name that hopefully won't conflict with
1052  * anything else.
1053  */
1054 static int
1055 cifs_rename_pending_delete(char *full_path, struct dentry *dentry, int xid)
1056 {
1057         int oplock = 0;
1058         int rc;
1059         __u16 netfid;
1060         struct inode *inode = dentry->d_inode;
1061         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1062         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1063         struct tcon_link *tlink;
1064         struct cifsTconInfo *tcon;
1065         __u32 dosattr, origattr;
1066         FILE_BASIC_INFO *info_buf = NULL;
1067
1068         tlink = cifs_sb_tlink(cifs_sb);
1069         if (IS_ERR(tlink))
1070                 return PTR_ERR(tlink);
1071         tcon = tlink_tcon(tlink);
1072
1073         rc = CIFSSMBOpen(xid, tcon, full_path, FILE_OPEN,
1074                          DELETE|FILE_WRITE_ATTRIBUTES, CREATE_NOT_DIR,
1075                          &netfid, &oplock, NULL, cifs_sb->local_nls,
1076                          cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1077         if (rc != 0)
1078                 goto out;
1079
1080         origattr = cifsInode->cifsAttrs;
1081         if (origattr == 0)
1082                 origattr |= ATTR_NORMAL;
1083
1084         dosattr = origattr & ~ATTR_READONLY;
1085         if (dosattr == 0)
1086                 dosattr |= ATTR_NORMAL;
1087         dosattr |= ATTR_HIDDEN;
1088
1089         /* set ATTR_HIDDEN and clear ATTR_READONLY, but only if needed */
1090         if (dosattr != origattr) {
1091                 info_buf = kzalloc(sizeof(*info_buf), GFP_KERNEL);
1092                 if (info_buf == NULL) {
1093                         rc = -ENOMEM;
1094                         goto out_close;
1095                 }
1096                 info_buf->Attributes = cpu_to_le32(dosattr);
1097                 rc = CIFSSMBSetFileInfo(xid, tcon, info_buf, netfid,
1098                                         current->tgid);
1099                 /* although we would like to mark the file hidden
1100                    if that fails we will still try to rename it */
1101                 if (rc != 0)
1102                         cifsInode->cifsAttrs = dosattr;
1103                 else
1104                         dosattr = origattr; /* since not able to change them */
1105         }
1106
1107         /* rename the file */
1108         rc = CIFSSMBRenameOpenFile(xid, tcon, netfid, NULL, cifs_sb->local_nls,
1109                                    cifs_sb->mnt_cifs_flags &
1110                                             CIFS_MOUNT_MAP_SPECIAL_CHR);
1111         if (rc != 0) {
1112                 rc = -ETXTBSY;
1113                 goto undo_setattr;
1114         }
1115
1116         /* try to set DELETE_ON_CLOSE */
1117         if (!cifsInode->delete_pending) {
1118                 rc = CIFSSMBSetFileDisposition(xid, tcon, true, netfid,
1119                                                current->tgid);
1120                 /*
1121                  * some samba versions return -ENOENT when we try to set the
1122                  * file disposition here. Likely a samba bug, but work around
1123                  * it for now. This means that some cifsXXX files may hang
1124                  * around after they shouldn't.
1125                  *
1126                  * BB: remove this hack after more servers have the fix
1127                  */
1128                 if (rc == -ENOENT)
1129                         rc = 0;
1130                 else if (rc != 0) {
1131                         rc = -ETXTBSY;
1132                         goto undo_rename;
1133                 }
1134                 cifsInode->delete_pending = true;
1135         }
1136
1137 out_close:
1138         CIFSSMBClose(xid, tcon, netfid);
1139 out:
1140         kfree(info_buf);
1141         cifs_put_tlink(tlink);
1142         return rc;
1143
1144         /*
1145          * reset everything back to the original state. Don't bother
1146          * dealing with errors here since we can't do anything about
1147          * them anyway.
1148          */
1149 undo_rename:
1150         CIFSSMBRenameOpenFile(xid, tcon, netfid, dentry->d_name.name,
1151                                 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1152                                             CIFS_MOUNT_MAP_SPECIAL_CHR);
1153 undo_setattr:
1154         if (dosattr != origattr) {
1155                 info_buf->Attributes = cpu_to_le32(origattr);
1156                 if (!CIFSSMBSetFileInfo(xid, tcon, info_buf, netfid,
1157                                         current->tgid))
1158                         cifsInode->cifsAttrs = origattr;
1159         }
1160
1161         goto out_close;
1162 }
1163
1164
1165 /*
1166  * If dentry->d_inode is null (usually meaning the cached dentry
1167  * is a negative dentry) then we would attempt a standard SMB delete, but
1168  * if that fails we can not attempt the fall back mechanisms on EACCESS
1169  * but will return the EACCESS to the caller. Note that the VFS does not call
1170  * unlink on negative dentries currently.
1171  */
1172 int cifs_unlink(struct inode *dir, struct dentry *dentry)
1173 {
1174         int rc = 0;
1175         int xid;
1176         char *full_path = NULL;
1177         struct inode *inode = dentry->d_inode;
1178         struct cifsInodeInfo *cifs_inode;
1179         struct super_block *sb = dir->i_sb;
1180         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
1181         struct tcon_link *tlink;
1182         struct cifsTconInfo *tcon;
1183         struct iattr *attrs = NULL;
1184         __u32 dosattr = 0, origattr = 0;
1185
1186         cFYI(1, "cifs_unlink, dir=0x%p, dentry=0x%p", dir, dentry);
1187
1188         tlink = cifs_sb_tlink(cifs_sb);
1189         if (IS_ERR(tlink))
1190                 return PTR_ERR(tlink);
1191         tcon = tlink_tcon(tlink);
1192
1193         xid = GetXid();
1194
1195         /* Unlink can be called from rename so we can not take the
1196          * sb->s_vfs_rename_mutex here */
1197         full_path = build_path_from_dentry(dentry);
1198         if (full_path == NULL) {
1199                 rc = -ENOMEM;
1200                 goto unlink_out;
1201         }
1202
1203         if ((tcon->ses->capabilities & CAP_UNIX) &&
1204                 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
1205                         le64_to_cpu(tcon->fsUnixInfo.Capability))) {
1206                 rc = CIFSPOSIXDelFile(xid, tcon, full_path,
1207                         SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls,
1208                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1209                 cFYI(1, "posix del rc %d", rc);
1210                 if ((rc == 0) || (rc == -ENOENT))
1211                         goto psx_del_no_retry;
1212         }
1213
1214 retry_std_delete:
1215         rc = CIFSSMBDelFile(xid, tcon, full_path, cifs_sb->local_nls,
1216                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1217
1218 psx_del_no_retry:
1219         if (!rc) {
1220                 if (inode)
1221                         drop_nlink(inode);
1222         } else if (rc == -ENOENT) {
1223                 d_drop(dentry);
1224         } else if (rc == -ETXTBSY) {
1225                 rc = cifs_rename_pending_delete(full_path, dentry, xid);
1226                 if (rc == 0)
1227                         drop_nlink(inode);
1228         } else if ((rc == -EACCES) && (dosattr == 0) && inode) {
1229                 attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
1230                 if (attrs == NULL) {
1231                         rc = -ENOMEM;
1232                         goto out_reval;
1233                 }
1234
1235                 /* try to reset dos attributes */
1236                 cifs_inode = CIFS_I(inode);
1237                 origattr = cifs_inode->cifsAttrs;
1238                 if (origattr == 0)
1239                         origattr |= ATTR_NORMAL;
1240                 dosattr = origattr & ~ATTR_READONLY;
1241                 if (dosattr == 0)
1242                         dosattr |= ATTR_NORMAL;
1243                 dosattr |= ATTR_HIDDEN;
1244
1245                 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
1246                 if (rc != 0)
1247                         goto out_reval;
1248
1249                 goto retry_std_delete;
1250         }
1251
1252         /* undo the setattr if we errored out and it's needed */
1253         if (rc != 0 && dosattr != 0)
1254                 cifs_set_file_info(inode, attrs, xid, full_path, origattr);
1255
1256 out_reval:
1257         if (inode) {
1258                 cifs_inode = CIFS_I(inode);
1259                 cifs_inode->time = 0;   /* will force revalidate to get info
1260                                            when needed */
1261                 inode->i_ctime = current_fs_time(sb);
1262         }
1263         dir->i_ctime = dir->i_mtime = current_fs_time(sb);
1264         cifs_inode = CIFS_I(dir);
1265         CIFS_I(dir)->time = 0;  /* force revalidate of dir as well */
1266 unlink_out:
1267         kfree(full_path);
1268         kfree(attrs);
1269         FreeXid(xid);
1270         cifs_put_tlink(tlink);
1271         return rc;
1272 }
1273
1274 int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
1275 {
1276         int rc = 0, tmprc;
1277         int xid;
1278         struct cifs_sb_info *cifs_sb;
1279         struct tcon_link *tlink;
1280         struct cifsTconInfo *pTcon;
1281         char *full_path = NULL;
1282         struct inode *newinode = NULL;
1283         struct cifs_fattr fattr;
1284
1285         cFYI(1, "In cifs_mkdir, mode = 0x%x inode = 0x%p", mode, inode);
1286
1287         cifs_sb = CIFS_SB(inode->i_sb);
1288         tlink = cifs_sb_tlink(cifs_sb);
1289         if (IS_ERR(tlink))
1290                 return PTR_ERR(tlink);
1291         pTcon = tlink_tcon(tlink);
1292
1293         xid = GetXid();
1294
1295         full_path = build_path_from_dentry(direntry);
1296         if (full_path == NULL) {
1297                 rc = -ENOMEM;
1298                 goto mkdir_out;
1299         }
1300
1301         if ((pTcon->ses->capabilities & CAP_UNIX) &&
1302                 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
1303                         le64_to_cpu(pTcon->fsUnixInfo.Capability))) {
1304                 u32 oplock = 0;
1305                 FILE_UNIX_BASIC_INFO *pInfo =
1306                         kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
1307                 if (pInfo == NULL) {
1308                         rc = -ENOMEM;
1309                         goto mkdir_out;
1310                 }
1311
1312                 mode &= ~current_umask();
1313                 rc = CIFSPOSIXCreate(xid, pTcon, SMB_O_DIRECTORY | SMB_O_CREAT,
1314                                 mode, NULL /* netfid */, pInfo, &oplock,
1315                                 full_path, cifs_sb->local_nls,
1316                                 cifs_sb->mnt_cifs_flags &
1317                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1318                 if (rc == -EOPNOTSUPP) {
1319                         kfree(pInfo);
1320                         goto mkdir_retry_old;
1321                 } else if (rc) {
1322                         cFYI(1, "posix mkdir returned 0x%x", rc);
1323                         d_drop(direntry);
1324                 } else {
1325                         if (pInfo->Type == cpu_to_le32(-1)) {
1326                                 /* no return info, go query for it */
1327                                 kfree(pInfo);
1328                                 goto mkdir_get_info;
1329                         }
1330 /*BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if need
1331         to set uid/gid */
1332                         inc_nlink(inode);
1333
1334                         cifs_unix_basic_to_fattr(&fattr, pInfo, cifs_sb);
1335                         cifs_fill_uniqueid(inode->i_sb, &fattr);
1336                         newinode = cifs_iget(inode->i_sb, &fattr);
1337                         if (!newinode) {
1338                                 kfree(pInfo);
1339                                 goto mkdir_get_info;
1340                         }
1341
1342                         d_instantiate(direntry, newinode);
1343
1344 #ifdef CONFIG_CIFS_DEBUG2
1345                         cFYI(1, "instantiated dentry %p %s to inode %p",
1346                                 direntry, direntry->d_name.name, newinode);
1347
1348                         if (newinode->i_nlink != 2)
1349                                 cFYI(1, "unexpected number of links %d",
1350                                         newinode->i_nlink);
1351 #endif
1352                 }
1353                 kfree(pInfo);
1354                 goto mkdir_out;
1355         }
1356 mkdir_retry_old:
1357         /* BB add setting the equivalent of mode via CreateX w/ACLs */
1358         rc = CIFSSMBMkDir(xid, pTcon, full_path, cifs_sb->local_nls,
1359                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1360         if (rc) {
1361                 cFYI(1, "cifs_mkdir returned 0x%x", rc);
1362                 d_drop(direntry);
1363         } else {
1364 mkdir_get_info:
1365                 inc_nlink(inode);
1366                 if (pTcon->unix_ext)
1367                         rc = cifs_get_inode_info_unix(&newinode, full_path,
1368                                                       inode->i_sb, xid);
1369                 else
1370                         rc = cifs_get_inode_info(&newinode, full_path, NULL,
1371                                                  inode->i_sb, xid, NULL);
1372
1373                 d_instantiate(direntry, newinode);
1374                  /* setting nlink not necessary except in cases where we
1375                   * failed to get it from the server or was set bogus */
1376                 if ((direntry->d_inode) && (direntry->d_inode->i_nlink < 2))
1377                                 direntry->d_inode->i_nlink = 2;
1378
1379                 mode &= ~current_umask();
1380                 /* must turn on setgid bit if parent dir has it */
1381                 if (inode->i_mode & S_ISGID)
1382                         mode |= S_ISGID;
1383
1384                 if (pTcon->unix_ext) {
1385                         struct cifs_unix_set_info_args args = {
1386                                 .mode   = mode,
1387                                 .ctime  = NO_CHANGE_64,
1388                                 .atime  = NO_CHANGE_64,
1389                                 .mtime  = NO_CHANGE_64,
1390                                 .device = 0,
1391                         };
1392                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1393                                 args.uid = (__u64)current_fsuid();
1394                                 if (inode->i_mode & S_ISGID)
1395                                         args.gid = (__u64)inode->i_gid;
1396                                 else
1397                                         args.gid = (__u64)current_fsgid();
1398                         } else {
1399                                 args.uid = NO_CHANGE_64;
1400                                 args.gid = NO_CHANGE_64;
1401                         }
1402                         CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, &args,
1403                                                cifs_sb->local_nls,
1404                                                cifs_sb->mnt_cifs_flags &
1405                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1406                 } else {
1407                         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
1408                             (mode & S_IWUGO) == 0) {
1409                                 FILE_BASIC_INFO pInfo;
1410                                 struct cifsInodeInfo *cifsInode;
1411                                 u32 dosattrs;
1412
1413                                 memset(&pInfo, 0, sizeof(pInfo));
1414                                 cifsInode = CIFS_I(newinode);
1415                                 dosattrs = cifsInode->cifsAttrs|ATTR_READONLY;
1416                                 pInfo.Attributes = cpu_to_le32(dosattrs);
1417                                 tmprc = CIFSSMBSetPathInfo(xid, pTcon,
1418                                                 full_path, &pInfo,
1419                                                 cifs_sb->local_nls,
1420                                                 cifs_sb->mnt_cifs_flags &
1421                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1422                                 if (tmprc == 0)
1423                                         cifsInode->cifsAttrs = dosattrs;
1424                         }
1425                         if (direntry->d_inode) {
1426                                 if (cifs_sb->mnt_cifs_flags &
1427                                      CIFS_MOUNT_DYNPERM)
1428                                         direntry->d_inode->i_mode =
1429                                                 (mode | S_IFDIR);
1430
1431                                 if (cifs_sb->mnt_cifs_flags &
1432                                      CIFS_MOUNT_SET_UID) {
1433                                         direntry->d_inode->i_uid =
1434                                                 current_fsuid();
1435                                         if (inode->i_mode & S_ISGID)
1436                                                 direntry->d_inode->i_gid =
1437                                                         inode->i_gid;
1438                                         else
1439                                                 direntry->d_inode->i_gid =
1440                                                         current_fsgid();
1441                                 }
1442                         }
1443                 }
1444         }
1445 mkdir_out:
1446         kfree(full_path);
1447         FreeXid(xid);
1448         cifs_put_tlink(tlink);
1449         return rc;
1450 }
1451
1452 int cifs_rmdir(struct inode *inode, struct dentry *direntry)
1453 {
1454         int rc = 0;
1455         int xid;
1456         struct cifs_sb_info *cifs_sb;
1457         struct tcon_link *tlink;
1458         struct cifsTconInfo *pTcon;
1459         char *full_path = NULL;
1460         struct cifsInodeInfo *cifsInode;
1461
1462         cFYI(1, "cifs_rmdir, inode = 0x%p", inode);
1463
1464         xid = GetXid();
1465
1466         full_path = build_path_from_dentry(direntry);
1467         if (full_path == NULL) {
1468                 rc = -ENOMEM;
1469                 goto rmdir_exit;
1470         }
1471
1472         cifs_sb = CIFS_SB(inode->i_sb);
1473         tlink = cifs_sb_tlink(cifs_sb);
1474         if (IS_ERR(tlink)) {
1475                 rc = PTR_ERR(tlink);
1476                 goto rmdir_exit;
1477         }
1478         pTcon = tlink_tcon(tlink);
1479
1480         rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls,
1481                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1482         cifs_put_tlink(tlink);
1483
1484         if (!rc) {
1485                 drop_nlink(inode);
1486                 spin_lock(&direntry->d_inode->i_lock);
1487                 i_size_write(direntry->d_inode, 0);
1488                 clear_nlink(direntry->d_inode);
1489                 spin_unlock(&direntry->d_inode->i_lock);
1490         }
1491
1492         cifsInode = CIFS_I(direntry->d_inode);
1493         cifsInode->time = 0;    /* force revalidate to go get info when
1494                                    needed */
1495
1496         cifsInode = CIFS_I(inode);
1497         cifsInode->time = 0;    /* force revalidate to get parent dir info
1498                                    since cached search results now invalid */
1499
1500         direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
1501                 current_fs_time(inode->i_sb);
1502
1503 rmdir_exit:
1504         kfree(full_path);
1505         FreeXid(xid);
1506         return rc;
1507 }
1508
1509 static int
1510 cifs_do_rename(int xid, struct dentry *from_dentry, const char *fromPath,
1511                 struct dentry *to_dentry, const char *toPath)
1512 {
1513         struct cifs_sb_info *cifs_sb = CIFS_SB(from_dentry->d_sb);
1514         struct tcon_link *tlink;
1515         struct cifsTconInfo *pTcon;
1516         __u16 srcfid;
1517         int oplock, rc;
1518
1519         tlink = cifs_sb_tlink(cifs_sb);
1520         if (IS_ERR(tlink))
1521                 return PTR_ERR(tlink);
1522         pTcon = tlink_tcon(tlink);
1523
1524         /* try path-based rename first */
1525         rc = CIFSSMBRename(xid, pTcon, fromPath, toPath, cifs_sb->local_nls,
1526                            cifs_sb->mnt_cifs_flags &
1527                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1528
1529         /*
1530          * don't bother with rename by filehandle unless file is busy and
1531          * source Note that cross directory moves do not work with
1532          * rename by filehandle to various Windows servers.
1533          */
1534         if (rc == 0 || rc != -ETXTBSY)
1535                 goto do_rename_exit;
1536
1537         /* open-file renames don't work across directories */
1538         if (to_dentry->d_parent != from_dentry->d_parent)
1539                 goto do_rename_exit;
1540
1541         /* open the file to be renamed -- we need DELETE perms */
1542         rc = CIFSSMBOpen(xid, pTcon, fromPath, FILE_OPEN, DELETE,
1543                          CREATE_NOT_DIR, &srcfid, &oplock, NULL,
1544                          cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1545                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1546
1547         if (rc == 0) {
1548                 rc = CIFSSMBRenameOpenFile(xid, pTcon, srcfid,
1549                                 (const char *) to_dentry->d_name.name,
1550                                 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1551                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1552
1553                 CIFSSMBClose(xid, pTcon, srcfid);
1554         }
1555 do_rename_exit:
1556         cifs_put_tlink(tlink);
1557         return rc;
1558 }
1559
1560 int cifs_rename(struct inode *source_dir, struct dentry *source_dentry,
1561         struct inode *target_dir, struct dentry *target_dentry)
1562 {
1563         char *fromName = NULL;
1564         char *toName = NULL;
1565         struct cifs_sb_info *cifs_sb;
1566         struct tcon_link *tlink;
1567         struct cifsTconInfo *tcon;
1568         FILE_UNIX_BASIC_INFO *info_buf_source = NULL;
1569         FILE_UNIX_BASIC_INFO *info_buf_target;
1570         int xid, rc, tmprc;
1571
1572         cifs_sb = CIFS_SB(source_dir->i_sb);
1573         tlink = cifs_sb_tlink(cifs_sb);
1574         if (IS_ERR(tlink))
1575                 return PTR_ERR(tlink);
1576         tcon = tlink_tcon(tlink);
1577
1578         xid = GetXid();
1579
1580         /*
1581          * we already have the rename sem so we do not need to
1582          * grab it again here to protect the path integrity
1583          */
1584         fromName = build_path_from_dentry(source_dentry);
1585         if (fromName == NULL) {
1586                 rc = -ENOMEM;
1587                 goto cifs_rename_exit;
1588         }
1589
1590         toName = build_path_from_dentry(target_dentry);
1591         if (toName == NULL) {
1592                 rc = -ENOMEM;
1593                 goto cifs_rename_exit;
1594         }
1595
1596         rc = cifs_do_rename(xid, source_dentry, fromName,
1597                             target_dentry, toName);
1598
1599         if (rc == -EEXIST && tcon->unix_ext) {
1600                 /*
1601                  * Are src and dst hardlinks of same inode? We can
1602                  * only tell with unix extensions enabled
1603                  */
1604                 info_buf_source =
1605                         kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO),
1606                                         GFP_KERNEL);
1607                 if (info_buf_source == NULL) {
1608                         rc = -ENOMEM;
1609                         goto cifs_rename_exit;
1610                 }
1611
1612                 info_buf_target = info_buf_source + 1;
1613                 tmprc = CIFSSMBUnixQPathInfo(xid, tcon, fromName,
1614                                         info_buf_source,
1615                                         cifs_sb->local_nls,
1616                                         cifs_sb->mnt_cifs_flags &
1617                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1618                 if (tmprc != 0)
1619                         goto unlink_target;
1620
1621                 tmprc = CIFSSMBUnixQPathInfo(xid, tcon, toName,
1622                                         info_buf_target,
1623                                         cifs_sb->local_nls,
1624                                         cifs_sb->mnt_cifs_flags &
1625                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1626
1627                 if (tmprc == 0 && (info_buf_source->UniqueId ==
1628                                    info_buf_target->UniqueId)) {
1629                         /* same file, POSIX says that this is a noop */
1630                         rc = 0;
1631                         goto cifs_rename_exit;
1632                 }
1633         } /* else ... BB we could add the same check for Windows by
1634                      checking the UniqueId via FILE_INTERNAL_INFO */
1635
1636 unlink_target:
1637         /* Try unlinking the target dentry if it's not negative */
1638         if (target_dentry->d_inode && (rc == -EACCES || rc == -EEXIST)) {
1639                 tmprc = cifs_unlink(target_dir, target_dentry);
1640                 if (tmprc)
1641                         goto cifs_rename_exit;
1642
1643                 rc = cifs_do_rename(xid, source_dentry, fromName,
1644                                     target_dentry, toName);
1645         }
1646
1647 cifs_rename_exit:
1648         kfree(info_buf_source);
1649         kfree(fromName);
1650         kfree(toName);
1651         FreeXid(xid);
1652         cifs_put_tlink(tlink);
1653         return rc;
1654 }
1655
1656 static bool
1657 cifs_inode_needs_reval(struct inode *inode)
1658 {
1659         struct cifsInodeInfo *cifs_i = CIFS_I(inode);
1660         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1661
1662         if (cifs_i->clientCanCacheRead)
1663                 return false;
1664
1665         if (!lookupCacheEnabled)
1666                 return true;
1667
1668         if (cifs_i->time == 0)
1669                 return true;
1670
1671         if (!time_in_range(jiffies, cifs_i->time,
1672                                 cifs_i->time + cifs_sb->actimeo))
1673                 return true;
1674
1675         /* hardlinked files w/ noserverino get "special" treatment */
1676         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) &&
1677             S_ISREG(inode->i_mode) && inode->i_nlink != 1)
1678                 return true;
1679
1680         return false;
1681 }
1682
1683 /*
1684  * Zap the cache. Called when invalid_mapping flag is set.
1685  */
1686 void
1687 cifs_invalidate_mapping(struct inode *inode)
1688 {
1689         int rc;
1690         struct cifsInodeInfo *cifs_i = CIFS_I(inode);
1691
1692         cifs_i->invalid_mapping = false;
1693
1694         /* write back any cached data */
1695         if (inode->i_mapping && inode->i_mapping->nrpages != 0) {
1696                 rc = filemap_write_and_wait(inode->i_mapping);
1697                 mapping_set_error(inode->i_mapping, rc);
1698         }
1699         invalidate_remote_inode(inode);
1700         cifs_fscache_reset_inode_cookie(inode);
1701 }
1702
1703 int cifs_revalidate_file(struct file *filp)
1704 {
1705         int rc = 0;
1706         struct inode *inode = filp->f_path.dentry->d_inode;
1707         struct cifsFileInfo *cfile = (struct cifsFileInfo *) filp->private_data;
1708
1709         if (!cifs_inode_needs_reval(inode))
1710                 goto check_inval;
1711
1712         if (tlink_tcon(cfile->tlink)->unix_ext)
1713                 rc = cifs_get_file_info_unix(filp);
1714         else
1715                 rc = cifs_get_file_info(filp);
1716
1717 check_inval:
1718         if (CIFS_I(inode)->invalid_mapping)
1719                 cifs_invalidate_mapping(inode);
1720
1721         return rc;
1722 }
1723
1724 /* revalidate a dentry's inode attributes */
1725 int cifs_revalidate_dentry(struct dentry *dentry)
1726 {
1727         int xid;
1728         int rc = 0;
1729         char *full_path = NULL;
1730         struct inode *inode = dentry->d_inode;
1731         struct super_block *sb = dentry->d_sb;
1732
1733         if (inode == NULL)
1734                 return -ENOENT;
1735
1736         xid = GetXid();
1737
1738         if (!cifs_inode_needs_reval(inode))
1739                 goto check_inval;
1740
1741         /* can not safely grab the rename sem here if rename calls revalidate
1742            since that would deadlock */
1743         full_path = build_path_from_dentry(dentry);
1744         if (full_path == NULL) {
1745                 rc = -ENOMEM;
1746                 goto check_inval;
1747         }
1748
1749         cFYI(1, "Revalidate: %s inode 0x%p count %d dentry: 0x%p d_time %ld "
1750                  "jiffies %ld", full_path, inode, inode->i_count.counter,
1751                  dentry, dentry->d_time, jiffies);
1752
1753         if (cifs_sb_master_tcon(CIFS_SB(sb))->unix_ext)
1754                 rc = cifs_get_inode_info_unix(&inode, full_path, sb, xid);
1755         else
1756                 rc = cifs_get_inode_info(&inode, full_path, NULL, sb,
1757                                          xid, NULL);
1758
1759 check_inval:
1760         if (CIFS_I(inode)->invalid_mapping)
1761                 cifs_invalidate_mapping(inode);
1762
1763         kfree(full_path);
1764         FreeXid(xid);
1765         return rc;
1766 }
1767
1768 int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1769                  struct kstat *stat)
1770 {
1771         struct cifs_sb_info *cifs_sb = CIFS_SB(dentry->d_sb);
1772         struct cifsTconInfo *tcon = cifs_sb_master_tcon(cifs_sb);
1773         int err = cifs_revalidate_dentry(dentry);
1774
1775         if (!err) {
1776                 generic_fillattr(dentry->d_inode, stat);
1777                 stat->blksize = CIFS_MAX_MSGSIZE;
1778                 stat->ino = CIFS_I(dentry->d_inode)->uniqueid;
1779
1780                 /*
1781                  * If on a multiuser mount without unix extensions, and the
1782                  * admin hasn't overridden them, set the ownership to the
1783                  * fsuid/fsgid of the current process.
1784                  */
1785                 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER) &&
1786                     !tcon->unix_ext) {
1787                         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID))
1788                                 stat->uid = current_fsuid();
1789                         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID))
1790                                 stat->gid = current_fsgid();
1791                 }
1792         }
1793         return err;
1794 }
1795
1796 static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1797 {
1798         pgoff_t index = from >> PAGE_CACHE_SHIFT;
1799         unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1800         struct page *page;
1801         int rc = 0;
1802
1803         page = grab_cache_page(mapping, index);
1804         if (!page)
1805                 return -ENOMEM;
1806
1807         zero_user_segment(page, offset, PAGE_CACHE_SIZE);
1808         unlock_page(page);
1809         page_cache_release(page);
1810         return rc;
1811 }
1812
1813 static void cifs_setsize(struct inode *inode, loff_t offset)
1814 {
1815         loff_t oldsize;
1816
1817         spin_lock(&inode->i_lock);
1818         oldsize = inode->i_size;
1819         i_size_write(inode, offset);
1820         spin_unlock(&inode->i_lock);
1821
1822         truncate_pagecache(inode, oldsize, offset);
1823 }
1824
1825 static int
1826 cifs_set_file_size(struct inode *inode, struct iattr *attrs,
1827                    int xid, char *full_path)
1828 {
1829         int rc;
1830         struct cifsFileInfo *open_file;
1831         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1832         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1833         struct tcon_link *tlink = NULL;
1834         struct cifsTconInfo *pTcon = NULL;
1835
1836         /*
1837          * To avoid spurious oplock breaks from server, in the case of
1838          * inodes that we already have open, avoid doing path based
1839          * setting of file size if we can do it by handle.
1840          * This keeps our caching token (oplock) and avoids timeouts
1841          * when the local oplock break takes longer to flush
1842          * writebehind data than the SMB timeout for the SetPathInfo
1843          * request would allow
1844          */
1845         open_file = find_writable_file(cifsInode, true);
1846         if (open_file) {
1847                 __u16 nfid = open_file->netfid;
1848                 __u32 npid = open_file->pid;
1849                 pTcon = tlink_tcon(open_file->tlink);
1850                 rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size, nfid,
1851                                         npid, false);
1852                 cifsFileInfo_put(open_file);
1853                 cFYI(1, "SetFSize for attrs rc = %d", rc);
1854                 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1855                         unsigned int bytes_written;
1856                         rc = CIFSSMBWrite(xid, pTcon, nfid, 0, attrs->ia_size,
1857                                           &bytes_written, NULL, NULL, 1);
1858                         cFYI(1, "Wrt seteof rc %d", rc);
1859                 }
1860         } else
1861                 rc = -EINVAL;
1862
1863         if (rc != 0) {
1864                 if (pTcon == NULL) {
1865                         tlink = cifs_sb_tlink(cifs_sb);
1866                         if (IS_ERR(tlink))
1867                                 return PTR_ERR(tlink);
1868                         pTcon = tlink_tcon(tlink);
1869                 }
1870
1871                 /* Set file size by pathname rather than by handle
1872                    either because no valid, writeable file handle for
1873                    it was found or because there was an error setting
1874                    it by handle */
1875                 rc = CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size,
1876                                    false, cifs_sb->local_nls,
1877                                    cifs_sb->mnt_cifs_flags &
1878                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1879                 cFYI(1, "SetEOF by path (setattrs) rc = %d", rc);
1880                 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1881                         __u16 netfid;
1882                         int oplock = 0;
1883
1884                         rc = SMBLegacyOpen(xid, pTcon, full_path,
1885                                 FILE_OPEN, GENERIC_WRITE,
1886                                 CREATE_NOT_DIR, &netfid, &oplock, NULL,
1887                                 cifs_sb->local_nls,
1888                                 cifs_sb->mnt_cifs_flags &
1889                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1890                         if (rc == 0) {
1891                                 unsigned int bytes_written;
1892                                 rc = CIFSSMBWrite(xid, pTcon, netfid, 0,
1893                                                   attrs->ia_size,
1894                                                   &bytes_written, NULL,
1895                                                   NULL, 1);
1896                                 cFYI(1, "wrt seteof rc %d", rc);
1897                                 CIFSSMBClose(xid, pTcon, netfid);
1898                         }
1899                 }
1900                 if (tlink)
1901                         cifs_put_tlink(tlink);
1902         }
1903
1904         if (rc == 0) {
1905                 cifsInode->server_eof = attrs->ia_size;
1906                 cifs_setsize(inode, attrs->ia_size);
1907                 cifs_truncate_page(inode->i_mapping, inode->i_size);
1908         }
1909
1910         return rc;
1911 }
1912
1913 static int
1914 cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
1915 {
1916         int rc;
1917         int xid;
1918         char *full_path = NULL;
1919         struct inode *inode = direntry->d_inode;
1920         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1921         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1922         struct tcon_link *tlink;
1923         struct cifsTconInfo *pTcon;
1924         struct cifs_unix_set_info_args *args = NULL;
1925         struct cifsFileInfo *open_file;
1926
1927         cFYI(1, "setattr_unix on file %s attrs->ia_valid=0x%x",
1928                  direntry->d_name.name, attrs->ia_valid);
1929
1930         xid = GetXid();
1931
1932         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
1933                 attrs->ia_valid |= ATTR_FORCE;
1934
1935         rc = inode_change_ok(inode, attrs);
1936         if (rc < 0)
1937                 goto out;
1938
1939         full_path = build_path_from_dentry(direntry);
1940         if (full_path == NULL) {
1941                 rc = -ENOMEM;
1942                 goto out;
1943         }
1944
1945         /*
1946          * Attempt to flush data before changing attributes. We need to do
1947          * this for ATTR_SIZE and ATTR_MTIME for sure, and if we change the
1948          * ownership or mode then we may also need to do this. Here, we take
1949          * the safe way out and just do the flush on all setattr requests. If
1950          * the flush returns error, store it to report later and continue.
1951          *
1952          * BB: This should be smarter. Why bother flushing pages that
1953          * will be truncated anyway? Also, should we error out here if
1954          * the flush returns error?
1955          */
1956         rc = filemap_write_and_wait(inode->i_mapping);
1957         mapping_set_error(inode->i_mapping, rc);
1958         rc = 0;
1959
1960         if (attrs->ia_valid & ATTR_SIZE) {
1961                 rc = cifs_set_file_size(inode, attrs, xid, full_path);
1962                 if (rc != 0)
1963                         goto out;
1964         }
1965
1966         /* skip mode change if it's just for clearing setuid/setgid */
1967         if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
1968                 attrs->ia_valid &= ~ATTR_MODE;
1969
1970         args = kmalloc(sizeof(*args), GFP_KERNEL);
1971         if (args == NULL) {
1972                 rc = -ENOMEM;
1973                 goto out;
1974         }
1975
1976         /* set up the struct */
1977         if (attrs->ia_valid & ATTR_MODE)
1978                 args->mode = attrs->ia_mode;
1979         else
1980                 args->mode = NO_CHANGE_64;
1981
1982         if (attrs->ia_valid & ATTR_UID)
1983                 args->uid = attrs->ia_uid;
1984         else
1985                 args->uid = NO_CHANGE_64;
1986
1987         if (attrs->ia_valid & ATTR_GID)
1988                 args->gid = attrs->ia_gid;
1989         else
1990                 args->gid = NO_CHANGE_64;
1991
1992         if (attrs->ia_valid & ATTR_ATIME)
1993                 args->atime = cifs_UnixTimeToNT(attrs->ia_atime);
1994         else
1995                 args->atime = NO_CHANGE_64;
1996
1997         if (attrs->ia_valid & ATTR_MTIME)
1998                 args->mtime = cifs_UnixTimeToNT(attrs->ia_mtime);
1999         else
2000                 args->mtime = NO_CHANGE_64;
2001
2002         if (attrs->ia_valid & ATTR_CTIME)
2003                 args->ctime = cifs_UnixTimeToNT(attrs->ia_ctime);
2004         else
2005                 args->ctime = NO_CHANGE_64;
2006
2007         args->device = 0;
2008         open_file = find_writable_file(cifsInode, true);
2009         if (open_file) {
2010                 u16 nfid = open_file->netfid;
2011                 u32 npid = open_file->pid;
2012                 pTcon = tlink_tcon(open_file->tlink);
2013                 rc = CIFSSMBUnixSetFileInfo(xid, pTcon, args, nfid, npid);
2014                 cifsFileInfo_put(open_file);
2015         } else {
2016                 tlink = cifs_sb_tlink(cifs_sb);
2017                 if (IS_ERR(tlink)) {
2018                         rc = PTR_ERR(tlink);
2019                         goto out;
2020                 }
2021                 pTcon = tlink_tcon(tlink);
2022                 rc = CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, args,
2023                                     cifs_sb->local_nls,
2024                                     cifs_sb->mnt_cifs_flags &
2025                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
2026                 cifs_put_tlink(tlink);
2027         }
2028
2029         if (rc)
2030                 goto out;
2031
2032         if ((attrs->ia_valid & ATTR_SIZE) &&
2033             attrs->ia_size != i_size_read(inode))
2034                 truncate_setsize(inode, attrs->ia_size);
2035
2036         setattr_copy(inode, attrs);
2037         mark_inode_dirty(inode);
2038
2039         /* force revalidate when any of these times are set since some
2040            of the fs types (eg ext3, fat) do not have fine enough
2041            time granularity to match protocol, and we do not have a
2042            a way (yet) to query the server fs's time granularity (and
2043            whether it rounds times down).
2044         */
2045         if (attrs->ia_valid & (ATTR_MTIME | ATTR_CTIME))
2046                 cifsInode->time = 0;
2047 out:
2048         kfree(args);
2049         kfree(full_path);
2050         FreeXid(xid);
2051         return rc;
2052 }
2053
2054 static int
2055 cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
2056 {
2057         int xid;
2058         struct inode *inode = direntry->d_inode;
2059         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2060         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
2061         char *full_path = NULL;
2062         int rc = -EACCES;
2063         __u32 dosattr = 0;
2064         __u64 mode = NO_CHANGE_64;
2065
2066         xid = GetXid();
2067
2068         cFYI(1, "setattr on file %s attrs->iavalid 0x%x",
2069                  direntry->d_name.name, attrs->ia_valid);
2070
2071         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
2072                 attrs->ia_valid |= ATTR_FORCE;
2073
2074         rc = inode_change_ok(inode, attrs);
2075         if (rc < 0) {
2076                 FreeXid(xid);
2077                 return rc;
2078         }
2079
2080         full_path = build_path_from_dentry(direntry);
2081         if (full_path == NULL) {
2082                 rc = -ENOMEM;
2083                 FreeXid(xid);
2084                 return rc;
2085         }
2086
2087         /*
2088          * Attempt to flush data before changing attributes. We need to do
2089          * this for ATTR_SIZE and ATTR_MTIME for sure, and if we change the
2090          * ownership or mode then we may also need to do this. Here, we take
2091          * the safe way out and just do the flush on all setattr requests. If
2092          * the flush returns error, store it to report later and continue.
2093          *
2094          * BB: This should be smarter. Why bother flushing pages that
2095          * will be truncated anyway? Also, should we error out here if
2096          * the flush returns error?
2097          */
2098         rc = filemap_write_and_wait(inode->i_mapping);
2099         mapping_set_error(inode->i_mapping, rc);
2100         rc = 0;
2101
2102         if (attrs->ia_valid & ATTR_SIZE) {
2103                 rc = cifs_set_file_size(inode, attrs, xid, full_path);
2104                 if (rc != 0)
2105                         goto cifs_setattr_exit;
2106         }
2107
2108         /*
2109          * Without unix extensions we can't send ownership changes to the
2110          * server, so silently ignore them. This is consistent with how
2111          * local DOS/Windows filesystems behave (VFAT, NTFS, etc). With
2112          * CIFSACL support + proper Windows to Unix idmapping, we may be
2113          * able to support this in the future.
2114          */
2115         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID))
2116                 attrs->ia_valid &= ~(ATTR_UID | ATTR_GID);
2117
2118         /* skip mode change if it's just for clearing setuid/setgid */
2119         if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
2120                 attrs->ia_valid &= ~ATTR_MODE;
2121
2122         if (attrs->ia_valid & ATTR_MODE) {
2123                 cFYI(1, "Mode changed to 0%o", attrs->ia_mode);
2124                 mode = attrs->ia_mode;
2125         }
2126
2127         if (attrs->ia_valid & ATTR_MODE) {
2128                 rc = 0;
2129 #ifdef CONFIG_CIFS_ACL
2130                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
2131                         rc = mode_to_cifs_acl(inode, full_path, mode);
2132                         if (rc) {
2133                                 cFYI(1, "%s: Setting ACL failed with error: %d",
2134                                         __func__, rc);
2135                                 goto cifs_setattr_exit;
2136                         }
2137                 } else
2138 #endif /* CONFIG_CIFS_ACL */
2139                 if (((mode & S_IWUGO) == 0) &&
2140                     (cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
2141
2142                         dosattr = cifsInode->cifsAttrs | ATTR_READONLY;
2143
2144                         /* fix up mode if we're not using dynperm */
2145                         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
2146                                 attrs->ia_mode = inode->i_mode & ~S_IWUGO;
2147                 } else if ((mode & S_IWUGO) &&
2148                            (cifsInode->cifsAttrs & ATTR_READONLY)) {
2149
2150                         dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
2151                         /* Attributes of 0 are ignored */
2152                         if (dosattr == 0)
2153                                 dosattr |= ATTR_NORMAL;
2154
2155                         /* reset local inode permissions to normal */
2156                         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
2157                                 attrs->ia_mode &= ~(S_IALLUGO);
2158                                 if (S_ISDIR(inode->i_mode))
2159                                         attrs->ia_mode |=
2160                                                 cifs_sb->mnt_dir_mode;
2161                                 else
2162                                         attrs->ia_mode |=
2163                                                 cifs_sb->mnt_file_mode;
2164                         }
2165                 } else if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
2166                         /* ignore mode change - ATTR_READONLY hasn't changed */
2167                         attrs->ia_valid &= ~ATTR_MODE;
2168                 }
2169         }
2170
2171         if (attrs->ia_valid & (ATTR_MTIME|ATTR_ATIME|ATTR_CTIME) ||
2172             ((attrs->ia_valid & ATTR_MODE) && dosattr)) {
2173                 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
2174                 /* BB: check for rc = -EOPNOTSUPP and switch to legacy mode */
2175
2176                 /* Even if error on time set, no sense failing the call if
2177                 the server would set the time to a reasonable value anyway,
2178                 and this check ensures that we are not being called from
2179                 sys_utimes in which case we ought to fail the call back to
2180                 the user when the server rejects the call */
2181                 if ((rc) && (attrs->ia_valid &
2182                                 (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
2183                         rc = 0;
2184         }
2185
2186         /* do not need local check to inode_check_ok since the server does
2187            that */
2188         if (rc)
2189                 goto cifs_setattr_exit;
2190
2191         if ((attrs->ia_valid & ATTR_SIZE) &&
2192             attrs->ia_size != i_size_read(inode))
2193                 truncate_setsize(inode, attrs->ia_size);
2194
2195         setattr_copy(inode, attrs);
2196         mark_inode_dirty(inode);
2197
2198 cifs_setattr_exit:
2199         kfree(full_path);
2200         FreeXid(xid);
2201         return rc;
2202 }
2203
2204 int
2205 cifs_setattr(struct dentry *direntry, struct iattr *attrs)
2206 {
2207         struct inode *inode = direntry->d_inode;
2208         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2209         struct cifsTconInfo *pTcon = cifs_sb_master_tcon(cifs_sb);
2210
2211         if (pTcon->unix_ext)
2212                 return cifs_setattr_unix(direntry, attrs);
2213
2214         return cifs_setattr_nounix(direntry, attrs);
2215
2216         /* BB: add cifs_setattr_legacy for really old servers */
2217 }
2218
2219 #if 0
2220 void cifs_delete_inode(struct inode *inode)
2221 {
2222         cFYI(1, "In cifs_delete_inode, inode = 0x%p", inode);
2223         /* may have to add back in if and when safe distributed caching of
2224            directories added e.g. via FindNotify */
2225 }
2226 #endif