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         dentry_unhash(direntry);
1465
1466         xid = GetXid();
1467
1468         full_path = build_path_from_dentry(direntry);
1469         if (full_path == NULL) {
1470                 rc = -ENOMEM;
1471                 goto rmdir_exit;
1472         }
1473
1474         cifs_sb = CIFS_SB(inode->i_sb);
1475         tlink = cifs_sb_tlink(cifs_sb);
1476         if (IS_ERR(tlink)) {
1477                 rc = PTR_ERR(tlink);
1478                 goto rmdir_exit;
1479         }
1480         pTcon = tlink_tcon(tlink);
1481
1482         rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls,
1483                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1484         cifs_put_tlink(tlink);
1485
1486         if (!rc) {
1487                 drop_nlink(inode);
1488                 spin_lock(&direntry->d_inode->i_lock);
1489                 i_size_write(direntry->d_inode, 0);
1490                 clear_nlink(direntry->d_inode);
1491                 spin_unlock(&direntry->d_inode->i_lock);
1492         }
1493
1494         cifsInode = CIFS_I(direntry->d_inode);
1495         cifsInode->time = 0;    /* force revalidate to go get info when
1496                                    needed */
1497
1498         cifsInode = CIFS_I(inode);
1499         cifsInode->time = 0;    /* force revalidate to get parent dir info
1500                                    since cached search results now invalid */
1501
1502         direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
1503                 current_fs_time(inode->i_sb);
1504
1505 rmdir_exit:
1506         kfree(full_path);
1507         FreeXid(xid);
1508         return rc;
1509 }
1510
1511 static int
1512 cifs_do_rename(int xid, struct dentry *from_dentry, const char *fromPath,
1513                 struct dentry *to_dentry, const char *toPath)
1514 {
1515         struct cifs_sb_info *cifs_sb = CIFS_SB(from_dentry->d_sb);
1516         struct tcon_link *tlink;
1517         struct cifsTconInfo *pTcon;
1518         __u16 srcfid;
1519         int oplock, rc;
1520
1521         tlink = cifs_sb_tlink(cifs_sb);
1522         if (IS_ERR(tlink))
1523                 return PTR_ERR(tlink);
1524         pTcon = tlink_tcon(tlink);
1525
1526         /* try path-based rename first */
1527         rc = CIFSSMBRename(xid, pTcon, fromPath, toPath, cifs_sb->local_nls,
1528                            cifs_sb->mnt_cifs_flags &
1529                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1530
1531         /*
1532          * don't bother with rename by filehandle unless file is busy and
1533          * source Note that cross directory moves do not work with
1534          * rename by filehandle to various Windows servers.
1535          */
1536         if (rc == 0 || rc != -ETXTBSY)
1537                 goto do_rename_exit;
1538
1539         /* open-file renames don't work across directories */
1540         if (to_dentry->d_parent != from_dentry->d_parent)
1541                 goto do_rename_exit;
1542
1543         /* open the file to be renamed -- we need DELETE perms */
1544         rc = CIFSSMBOpen(xid, pTcon, fromPath, FILE_OPEN, DELETE,
1545                          CREATE_NOT_DIR, &srcfid, &oplock, NULL,
1546                          cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1547                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1548
1549         if (rc == 0) {
1550                 rc = CIFSSMBRenameOpenFile(xid, pTcon, srcfid,
1551                                 (const char *) to_dentry->d_name.name,
1552                                 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1553                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1554
1555                 CIFSSMBClose(xid, pTcon, srcfid);
1556         }
1557 do_rename_exit:
1558         cifs_put_tlink(tlink);
1559         return rc;
1560 }
1561
1562 int cifs_rename(struct inode *source_dir, struct dentry *source_dentry,
1563         struct inode *target_dir, struct dentry *target_dentry)
1564 {
1565         char *fromName = NULL;
1566         char *toName = NULL;
1567         struct cifs_sb_info *cifs_sb;
1568         struct tcon_link *tlink;
1569         struct cifsTconInfo *tcon;
1570         FILE_UNIX_BASIC_INFO *info_buf_source = NULL;
1571         FILE_UNIX_BASIC_INFO *info_buf_target;
1572         int xid, rc, tmprc;
1573
1574         cifs_sb = CIFS_SB(source_dir->i_sb);
1575         tlink = cifs_sb_tlink(cifs_sb);
1576         if (IS_ERR(tlink))
1577                 return PTR_ERR(tlink);
1578         tcon = tlink_tcon(tlink);
1579
1580         xid = GetXid();
1581
1582         /*
1583          * we already have the rename sem so we do not need to
1584          * grab it again here to protect the path integrity
1585          */
1586         fromName = build_path_from_dentry(source_dentry);
1587         if (fromName == NULL) {
1588                 rc = -ENOMEM;
1589                 goto cifs_rename_exit;
1590         }
1591
1592         toName = build_path_from_dentry(target_dentry);
1593         if (toName == NULL) {
1594                 rc = -ENOMEM;
1595                 goto cifs_rename_exit;
1596         }
1597
1598         rc = cifs_do_rename(xid, source_dentry, fromName,
1599                             target_dentry, toName);
1600
1601         if (rc == -EEXIST && tcon->unix_ext) {
1602                 /*
1603                  * Are src and dst hardlinks of same inode? We can
1604                  * only tell with unix extensions enabled
1605                  */
1606                 info_buf_source =
1607                         kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO),
1608                                         GFP_KERNEL);
1609                 if (info_buf_source == NULL) {
1610                         rc = -ENOMEM;
1611                         goto cifs_rename_exit;
1612                 }
1613
1614                 info_buf_target = info_buf_source + 1;
1615                 tmprc = CIFSSMBUnixQPathInfo(xid, tcon, fromName,
1616                                         info_buf_source,
1617                                         cifs_sb->local_nls,
1618                                         cifs_sb->mnt_cifs_flags &
1619                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1620                 if (tmprc != 0)
1621                         goto unlink_target;
1622
1623                 tmprc = CIFSSMBUnixQPathInfo(xid, tcon, toName,
1624                                         info_buf_target,
1625                                         cifs_sb->local_nls,
1626                                         cifs_sb->mnt_cifs_flags &
1627                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1628
1629                 if (tmprc == 0 && (info_buf_source->UniqueId ==
1630                                    info_buf_target->UniqueId)) {
1631                         /* same file, POSIX says that this is a noop */
1632                         rc = 0;
1633                         goto cifs_rename_exit;
1634                 }
1635         } /* else ... BB we could add the same check for Windows by
1636                      checking the UniqueId via FILE_INTERNAL_INFO */
1637
1638 unlink_target:
1639         /* Try unlinking the target dentry if it's not negative */
1640         if (target_dentry->d_inode && (rc == -EACCES || rc == -EEXIST)) {
1641                 tmprc = cifs_unlink(target_dir, target_dentry);
1642                 if (tmprc)
1643                         goto cifs_rename_exit;
1644
1645                 rc = cifs_do_rename(xid, source_dentry, fromName,
1646                                     target_dentry, toName);
1647         }
1648
1649 cifs_rename_exit:
1650         kfree(info_buf_source);
1651         kfree(fromName);
1652         kfree(toName);
1653         FreeXid(xid);
1654         cifs_put_tlink(tlink);
1655         return rc;
1656 }
1657
1658 static bool
1659 cifs_inode_needs_reval(struct inode *inode)
1660 {
1661         struct cifsInodeInfo *cifs_i = CIFS_I(inode);
1662         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1663
1664         if (cifs_i->clientCanCacheRead)
1665                 return false;
1666
1667         if (!lookupCacheEnabled)
1668                 return true;
1669
1670         if (cifs_i->time == 0)
1671                 return true;
1672
1673         if (!time_in_range(jiffies, cifs_i->time,
1674                                 cifs_i->time + cifs_sb->actimeo))
1675                 return true;
1676
1677         /* hardlinked files w/ noserverino get "special" treatment */
1678         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) &&
1679             S_ISREG(inode->i_mode) && inode->i_nlink != 1)
1680                 return true;
1681
1682         return false;
1683 }
1684
1685 /*
1686  * Zap the cache. Called when invalid_mapping flag is set.
1687  */
1688 void
1689 cifs_invalidate_mapping(struct inode *inode)
1690 {
1691         int rc;
1692         struct cifsInodeInfo *cifs_i = CIFS_I(inode);
1693
1694         cifs_i->invalid_mapping = false;
1695
1696         /* write back any cached data */
1697         if (inode->i_mapping && inode->i_mapping->nrpages != 0) {
1698                 rc = filemap_write_and_wait(inode->i_mapping);
1699                 mapping_set_error(inode->i_mapping, rc);
1700         }
1701         invalidate_remote_inode(inode);
1702         cifs_fscache_reset_inode_cookie(inode);
1703 }
1704
1705 int cifs_revalidate_file(struct file *filp)
1706 {
1707         int rc = 0;
1708         struct inode *inode = filp->f_path.dentry->d_inode;
1709         struct cifsFileInfo *cfile = (struct cifsFileInfo *) filp->private_data;
1710
1711         if (!cifs_inode_needs_reval(inode))
1712                 goto check_inval;
1713
1714         if (tlink_tcon(cfile->tlink)->unix_ext)
1715                 rc = cifs_get_file_info_unix(filp);
1716         else
1717                 rc = cifs_get_file_info(filp);
1718
1719 check_inval:
1720         if (CIFS_I(inode)->invalid_mapping)
1721                 cifs_invalidate_mapping(inode);
1722
1723         return rc;
1724 }
1725
1726 /* revalidate a dentry's inode attributes */
1727 int cifs_revalidate_dentry(struct dentry *dentry)
1728 {
1729         int xid;
1730         int rc = 0;
1731         char *full_path = NULL;
1732         struct inode *inode = dentry->d_inode;
1733         struct super_block *sb = dentry->d_sb;
1734
1735         if (inode == NULL)
1736                 return -ENOENT;
1737
1738         xid = GetXid();
1739
1740         if (!cifs_inode_needs_reval(inode))
1741                 goto check_inval;
1742
1743         /* can not safely grab the rename sem here if rename calls revalidate
1744            since that would deadlock */
1745         full_path = build_path_from_dentry(dentry);
1746         if (full_path == NULL) {
1747                 rc = -ENOMEM;
1748                 goto check_inval;
1749         }
1750
1751         cFYI(1, "Revalidate: %s inode 0x%p count %d dentry: 0x%p d_time %ld "
1752                  "jiffies %ld", full_path, inode, inode->i_count.counter,
1753                  dentry, dentry->d_time, jiffies);
1754
1755         if (cifs_sb_master_tcon(CIFS_SB(sb))->unix_ext)
1756                 rc = cifs_get_inode_info_unix(&inode, full_path, sb, xid);
1757         else
1758                 rc = cifs_get_inode_info(&inode, full_path, NULL, sb,
1759                                          xid, NULL);
1760
1761 check_inval:
1762         if (CIFS_I(inode)->invalid_mapping)
1763                 cifs_invalidate_mapping(inode);
1764
1765         kfree(full_path);
1766         FreeXid(xid);
1767         return rc;
1768 }
1769
1770 int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1771                  struct kstat *stat)
1772 {
1773         struct cifs_sb_info *cifs_sb = CIFS_SB(dentry->d_sb);
1774         struct cifsTconInfo *tcon = cifs_sb_master_tcon(cifs_sb);
1775         int err = cifs_revalidate_dentry(dentry);
1776
1777         if (!err) {
1778                 generic_fillattr(dentry->d_inode, stat);
1779                 stat->blksize = CIFS_MAX_MSGSIZE;
1780                 stat->ino = CIFS_I(dentry->d_inode)->uniqueid;
1781
1782                 /*
1783                  * If on a multiuser mount without unix extensions, and the
1784                  * admin hasn't overridden them, set the ownership to the
1785                  * fsuid/fsgid of the current process.
1786                  */
1787                 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER) &&
1788                     !tcon->unix_ext) {
1789                         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID))
1790                                 stat->uid = current_fsuid();
1791                         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID))
1792                                 stat->gid = current_fsgid();
1793                 }
1794         }
1795         return err;
1796 }
1797
1798 static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1799 {
1800         pgoff_t index = from >> PAGE_CACHE_SHIFT;
1801         unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1802         struct page *page;
1803         int rc = 0;
1804
1805         page = grab_cache_page(mapping, index);
1806         if (!page)
1807                 return -ENOMEM;
1808
1809         zero_user_segment(page, offset, PAGE_CACHE_SIZE);
1810         unlock_page(page);
1811         page_cache_release(page);
1812         return rc;
1813 }
1814
1815 static void cifs_setsize(struct inode *inode, loff_t offset)
1816 {
1817         loff_t oldsize;
1818
1819         spin_lock(&inode->i_lock);
1820         oldsize = inode->i_size;
1821         i_size_write(inode, offset);
1822         spin_unlock(&inode->i_lock);
1823
1824         truncate_pagecache(inode, oldsize, offset);
1825 }
1826
1827 static int
1828 cifs_set_file_size(struct inode *inode, struct iattr *attrs,
1829                    int xid, char *full_path)
1830 {
1831         int rc;
1832         struct cifsFileInfo *open_file;
1833         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1834         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1835         struct tcon_link *tlink = NULL;
1836         struct cifsTconInfo *pTcon = NULL;
1837
1838         /*
1839          * To avoid spurious oplock breaks from server, in the case of
1840          * inodes that we already have open, avoid doing path based
1841          * setting of file size if we can do it by handle.
1842          * This keeps our caching token (oplock) and avoids timeouts
1843          * when the local oplock break takes longer to flush
1844          * writebehind data than the SMB timeout for the SetPathInfo
1845          * request would allow
1846          */
1847         open_file = find_writable_file(cifsInode, true);
1848         if (open_file) {
1849                 __u16 nfid = open_file->netfid;
1850                 __u32 npid = open_file->pid;
1851                 pTcon = tlink_tcon(open_file->tlink);
1852                 rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size, nfid,
1853                                         npid, false);
1854                 cifsFileInfo_put(open_file);
1855                 cFYI(1, "SetFSize for attrs rc = %d", rc);
1856                 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1857                         unsigned int bytes_written;
1858                         rc = CIFSSMBWrite(xid, pTcon, nfid, 0, attrs->ia_size,
1859                                           &bytes_written, NULL, NULL, 1);
1860                         cFYI(1, "Wrt seteof rc %d", rc);
1861                 }
1862         } else
1863                 rc = -EINVAL;
1864
1865         if (rc != 0) {
1866                 if (pTcon == NULL) {
1867                         tlink = cifs_sb_tlink(cifs_sb);
1868                         if (IS_ERR(tlink))
1869                                 return PTR_ERR(tlink);
1870                         pTcon = tlink_tcon(tlink);
1871                 }
1872
1873                 /* Set file size by pathname rather than by handle
1874                    either because no valid, writeable file handle for
1875                    it was found or because there was an error setting
1876                    it by handle */
1877                 rc = CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size,
1878                                    false, cifs_sb->local_nls,
1879                                    cifs_sb->mnt_cifs_flags &
1880                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1881                 cFYI(1, "SetEOF by path (setattrs) rc = %d", rc);
1882                 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1883                         __u16 netfid;
1884                         int oplock = 0;
1885
1886                         rc = SMBLegacyOpen(xid, pTcon, full_path,
1887                                 FILE_OPEN, GENERIC_WRITE,
1888                                 CREATE_NOT_DIR, &netfid, &oplock, NULL,
1889                                 cifs_sb->local_nls,
1890                                 cifs_sb->mnt_cifs_flags &
1891                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1892                         if (rc == 0) {
1893                                 unsigned int bytes_written;
1894                                 rc = CIFSSMBWrite(xid, pTcon, netfid, 0,
1895                                                   attrs->ia_size,
1896                                                   &bytes_written, NULL,
1897                                                   NULL, 1);
1898                                 cFYI(1, "wrt seteof rc %d", rc);
1899                                 CIFSSMBClose(xid, pTcon, netfid);
1900                         }
1901                 }
1902                 if (tlink)
1903                         cifs_put_tlink(tlink);
1904         }
1905
1906         if (rc == 0) {
1907                 cifsInode->server_eof = attrs->ia_size;
1908                 cifs_setsize(inode, attrs->ia_size);
1909                 cifs_truncate_page(inode->i_mapping, inode->i_size);
1910         }
1911
1912         return rc;
1913 }
1914
1915 static int
1916 cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
1917 {
1918         int rc;
1919         int xid;
1920         char *full_path = NULL;
1921         struct inode *inode = direntry->d_inode;
1922         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1923         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1924         struct tcon_link *tlink;
1925         struct cifsTconInfo *pTcon;
1926         struct cifs_unix_set_info_args *args = NULL;
1927         struct cifsFileInfo *open_file;
1928
1929         cFYI(1, "setattr_unix on file %s attrs->ia_valid=0x%x",
1930                  direntry->d_name.name, attrs->ia_valid);
1931
1932         xid = GetXid();
1933
1934         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
1935                 attrs->ia_valid |= ATTR_FORCE;
1936
1937         rc = inode_change_ok(inode, attrs);
1938         if (rc < 0)
1939                 goto out;
1940
1941         full_path = build_path_from_dentry(direntry);
1942         if (full_path == NULL) {
1943                 rc = -ENOMEM;
1944                 goto out;
1945         }
1946
1947         /*
1948          * Attempt to flush data before changing attributes. We need to do
1949          * this for ATTR_SIZE and ATTR_MTIME for sure, and if we change the
1950          * ownership or mode then we may also need to do this. Here, we take
1951          * the safe way out and just do the flush on all setattr requests. If
1952          * the flush returns error, store it to report later and continue.
1953          *
1954          * BB: This should be smarter. Why bother flushing pages that
1955          * will be truncated anyway? Also, should we error out here if
1956          * the flush returns error?
1957          */
1958         rc = filemap_write_and_wait(inode->i_mapping);
1959         mapping_set_error(inode->i_mapping, rc);
1960         rc = 0;
1961
1962         if (attrs->ia_valid & ATTR_SIZE) {
1963                 rc = cifs_set_file_size(inode, attrs, xid, full_path);
1964                 if (rc != 0)
1965                         goto out;
1966         }
1967
1968         /* skip mode change if it's just for clearing setuid/setgid */
1969         if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
1970                 attrs->ia_valid &= ~ATTR_MODE;
1971
1972         args = kmalloc(sizeof(*args), GFP_KERNEL);
1973         if (args == NULL) {
1974                 rc = -ENOMEM;
1975                 goto out;
1976         }
1977
1978         /* set up the struct */
1979         if (attrs->ia_valid & ATTR_MODE)
1980                 args->mode = attrs->ia_mode;
1981         else
1982                 args->mode = NO_CHANGE_64;
1983
1984         if (attrs->ia_valid & ATTR_UID)
1985                 args->uid = attrs->ia_uid;
1986         else
1987                 args->uid = NO_CHANGE_64;
1988
1989         if (attrs->ia_valid & ATTR_GID)
1990                 args->gid = attrs->ia_gid;
1991         else
1992                 args->gid = NO_CHANGE_64;
1993
1994         if (attrs->ia_valid & ATTR_ATIME)
1995                 args->atime = cifs_UnixTimeToNT(attrs->ia_atime);
1996         else
1997                 args->atime = NO_CHANGE_64;
1998
1999         if (attrs->ia_valid & ATTR_MTIME)
2000                 args->mtime = cifs_UnixTimeToNT(attrs->ia_mtime);
2001         else
2002                 args->mtime = NO_CHANGE_64;
2003
2004         if (attrs->ia_valid & ATTR_CTIME)
2005                 args->ctime = cifs_UnixTimeToNT(attrs->ia_ctime);
2006         else
2007                 args->ctime = NO_CHANGE_64;
2008
2009         args->device = 0;
2010         open_file = find_writable_file(cifsInode, true);
2011         if (open_file) {
2012                 u16 nfid = open_file->netfid;
2013                 u32 npid = open_file->pid;
2014                 pTcon = tlink_tcon(open_file->tlink);
2015                 rc = CIFSSMBUnixSetFileInfo(xid, pTcon, args, nfid, npid);
2016                 cifsFileInfo_put(open_file);
2017         } else {
2018                 tlink = cifs_sb_tlink(cifs_sb);
2019                 if (IS_ERR(tlink)) {
2020                         rc = PTR_ERR(tlink);
2021                         goto out;
2022                 }
2023                 pTcon = tlink_tcon(tlink);
2024                 rc = CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, args,
2025                                     cifs_sb->local_nls,
2026                                     cifs_sb->mnt_cifs_flags &
2027                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
2028                 cifs_put_tlink(tlink);
2029         }
2030
2031         if (rc)
2032                 goto out;
2033
2034         if ((attrs->ia_valid & ATTR_SIZE) &&
2035             attrs->ia_size != i_size_read(inode))
2036                 truncate_setsize(inode, attrs->ia_size);
2037
2038         setattr_copy(inode, attrs);
2039         mark_inode_dirty(inode);
2040
2041         /* force revalidate when any of these times are set since some
2042            of the fs types (eg ext3, fat) do not have fine enough
2043            time granularity to match protocol, and we do not have a
2044            a way (yet) to query the server fs's time granularity (and
2045            whether it rounds times down).
2046         */
2047         if (attrs->ia_valid & (ATTR_MTIME | ATTR_CTIME))
2048                 cifsInode->time = 0;
2049 out:
2050         kfree(args);
2051         kfree(full_path);
2052         FreeXid(xid);
2053         return rc;
2054 }
2055
2056 static int
2057 cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
2058 {
2059         int xid;
2060         struct inode *inode = direntry->d_inode;
2061         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2062         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
2063         char *full_path = NULL;
2064         int rc = -EACCES;
2065         __u32 dosattr = 0;
2066         __u64 mode = NO_CHANGE_64;
2067
2068         xid = GetXid();
2069
2070         cFYI(1, "setattr on file %s attrs->iavalid 0x%x",
2071                  direntry->d_name.name, attrs->ia_valid);
2072
2073         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
2074                 attrs->ia_valid |= ATTR_FORCE;
2075
2076         rc = inode_change_ok(inode, attrs);
2077         if (rc < 0) {
2078                 FreeXid(xid);
2079                 return rc;
2080         }
2081
2082         full_path = build_path_from_dentry(direntry);
2083         if (full_path == NULL) {
2084                 rc = -ENOMEM;
2085                 FreeXid(xid);
2086                 return rc;
2087         }
2088
2089         /*
2090          * Attempt to flush data before changing attributes. We need to do
2091          * this for ATTR_SIZE and ATTR_MTIME for sure, and if we change the
2092          * ownership or mode then we may also need to do this. Here, we take
2093          * the safe way out and just do the flush on all setattr requests. If
2094          * the flush returns error, store it to report later and continue.
2095          *
2096          * BB: This should be smarter. Why bother flushing pages that
2097          * will be truncated anyway? Also, should we error out here if
2098          * the flush returns error?
2099          */
2100         rc = filemap_write_and_wait(inode->i_mapping);
2101         mapping_set_error(inode->i_mapping, rc);
2102         rc = 0;
2103
2104         if (attrs->ia_valid & ATTR_SIZE) {
2105                 rc = cifs_set_file_size(inode, attrs, xid, full_path);
2106                 if (rc != 0)
2107                         goto cifs_setattr_exit;
2108         }
2109
2110         /*
2111          * Without unix extensions we can't send ownership changes to the
2112          * server, so silently ignore them. This is consistent with how
2113          * local DOS/Windows filesystems behave (VFAT, NTFS, etc). With
2114          * CIFSACL support + proper Windows to Unix idmapping, we may be
2115          * able to support this in the future.
2116          */
2117         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID))
2118                 attrs->ia_valid &= ~(ATTR_UID | ATTR_GID);
2119
2120         /* skip mode change if it's just for clearing setuid/setgid */
2121         if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
2122                 attrs->ia_valid &= ~ATTR_MODE;
2123
2124         if (attrs->ia_valid & ATTR_MODE) {
2125                 cFYI(1, "Mode changed to 0%o", attrs->ia_mode);
2126                 mode = attrs->ia_mode;
2127         }
2128
2129         if (attrs->ia_valid & ATTR_MODE) {
2130                 rc = 0;
2131 #ifdef CONFIG_CIFS_ACL
2132                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
2133                         rc = mode_to_cifs_acl(inode, full_path, mode);
2134                         if (rc) {
2135                                 cFYI(1, "%s: Setting ACL failed with error: %d",
2136                                         __func__, rc);
2137                                 goto cifs_setattr_exit;
2138                         }
2139                 } else
2140 #endif /* CONFIG_CIFS_ACL */
2141                 if (((mode & S_IWUGO) == 0) &&
2142                     (cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
2143
2144                         dosattr = cifsInode->cifsAttrs | ATTR_READONLY;
2145
2146                         /* fix up mode if we're not using dynperm */
2147                         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
2148                                 attrs->ia_mode = inode->i_mode & ~S_IWUGO;
2149                 } else if ((mode & S_IWUGO) &&
2150                            (cifsInode->cifsAttrs & ATTR_READONLY)) {
2151
2152                         dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
2153                         /* Attributes of 0 are ignored */
2154                         if (dosattr == 0)
2155                                 dosattr |= ATTR_NORMAL;
2156
2157                         /* reset local inode permissions to normal */
2158                         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
2159                                 attrs->ia_mode &= ~(S_IALLUGO);
2160                                 if (S_ISDIR(inode->i_mode))
2161                                         attrs->ia_mode |=
2162                                                 cifs_sb->mnt_dir_mode;
2163                                 else
2164                                         attrs->ia_mode |=
2165                                                 cifs_sb->mnt_file_mode;
2166                         }
2167                 } else if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
2168                         /* ignore mode change - ATTR_READONLY hasn't changed */
2169                         attrs->ia_valid &= ~ATTR_MODE;
2170                 }
2171         }
2172
2173         if (attrs->ia_valid & (ATTR_MTIME|ATTR_ATIME|ATTR_CTIME) ||
2174             ((attrs->ia_valid & ATTR_MODE) && dosattr)) {
2175                 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
2176                 /* BB: check for rc = -EOPNOTSUPP and switch to legacy mode */
2177
2178                 /* Even if error on time set, no sense failing the call if
2179                 the server would set the time to a reasonable value anyway,
2180                 and this check ensures that we are not being called from
2181                 sys_utimes in which case we ought to fail the call back to
2182                 the user when the server rejects the call */
2183                 if ((rc) && (attrs->ia_valid &
2184                                 (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
2185                         rc = 0;
2186         }
2187
2188         /* do not need local check to inode_check_ok since the server does
2189            that */
2190         if (rc)
2191                 goto cifs_setattr_exit;
2192
2193         if ((attrs->ia_valid & ATTR_SIZE) &&
2194             attrs->ia_size != i_size_read(inode))
2195                 truncate_setsize(inode, attrs->ia_size);
2196
2197         setattr_copy(inode, attrs);
2198         mark_inode_dirty(inode);
2199
2200 cifs_setattr_exit:
2201         kfree(full_path);
2202         FreeXid(xid);
2203         return rc;
2204 }
2205
2206 int
2207 cifs_setattr(struct dentry *direntry, struct iattr *attrs)
2208 {
2209         struct inode *inode = direntry->d_inode;
2210         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2211         struct cifsTconInfo *pTcon = cifs_sb_master_tcon(cifs_sb);
2212
2213         if (pTcon->unix_ext)
2214                 return cifs_setattr_unix(direntry, attrs);
2215
2216         return cifs_setattr_nounix(direntry, attrs);
2217
2218         /* BB: add cifs_setattr_legacy for really old servers */
2219 }
2220
2221 #if 0
2222 void cifs_delete_inode(struct inode *inode)
2223 {
2224         cFYI(1, "In cifs_delete_inode, inode = 0x%p", inode);
2225         /* may have to add back in if and when safe distributed caching of
2226            directories added e.g. via FindNotify */
2227 }
2228 #endif