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, const bool is_dfs_referral)
  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_NO_BRL)
  48                         inode->i_fop = &cifs_file_nobrl_ops;
  49                 else { /* not direct, send byte range locks */
  50                         inode->i_fop = &cifs_file_ops;
  51                 }
  52
  53
  54                 /* check if server can support readpages */
  55                 if (cifs_sb_master_tcon(cifs_sb)->ses->server->maxBuf <
  56                                 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE)
  57                         inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
  58                 else
  59                         inode->i_data.a_ops = &cifs_addr_ops;
  60                 break;
  61         case S_IFDIR:
  62 #ifdef CONFIG_CIFS_DFS_UPCALL
  63                 if (is_dfs_referral) {
  64                         inode->i_op = &cifs_dfs_referral_inode_operations;
  65                 } else {
  66 #else /* NO DFS support, treat as a directory */
  67                 {
  68 #endif
  69                         inode->i_op = &cifs_dir_inode_ops;
  70                         inode->i_fop = &cifs_dir_ops;
  71                 }
  72                 break;
  73         case S_IFLNK:
  74                 inode->i_op = &cifs_symlink_inode_ops;
  75                 break;
  76         default:
  77                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
  78                 break;
  79         }
  80 }
  81
  82 /* check inode attributes against fattr. If they don't match, tag the
  83  * inode for cache invalidation
  84  */
  85 static void
  86 cifs_revalidate_cache(struct inode *inode, struct cifs_fattr *fattr)
  87 {
  88         struct cifsInodeInfo *cifs_i = CIFS_I(inode);
  89
  90         cFYI(1, "%s: revalidating inode %llu", __func__, cifs_i->uniqueid);
  91
  92         if (inode->i_state & I_NEW) {
  93                 cFYI(1, "%s: inode %llu is new", __func__, cifs_i->uniqueid);
  94                 return;
  95         }
  96
  97         /* don't bother with revalidation if we have an oplock */
  98         if (cifs_i->clientCanCacheRead) {
  99                 cFYI(1, "%s: inode %llu is oplocked", __func__,
 100                          cifs_i->uniqueid);
 101                 return;
 102         }
 103
 104          /* revalidate if mtime or size have changed */
 105         if (timespec_equal(&inode->i_mtime, &fattr->cf_mtime) &&
 106             cifs_i->server_eof == fattr->cf_eof) {
 107                 cFYI(1, "%s: inode %llu is unchanged", __func__,
 108                          cifs_i->uniqueid);
 109                 return;
 110         }
 111
 112         cFYI(1, "%s: invalidating inode %llu mapping", __func__,
 113                  cifs_i->uniqueid);
 114         cifs_i->invalid_mapping = true;
 115 }
 116
 117 /* populate an inode with info from a cifs_fattr struct */
 118 void
 119 cifs_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr)
 120 {
 121         struct cifsInodeInfo *cifs_i = CIFS_I(inode);
 122         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 123         unsigned long oldtime = cifs_i->time;
 124
 125         cifs_revalidate_cache(inode, fattr);
 126
 127         inode->i_atime = fattr->cf_atime;
 128         inode->i_mtime = fattr->cf_mtime;
 129         inode->i_ctime = fattr->cf_ctime;
 130         inode->i_rdev = fattr->cf_rdev;
 131         inode->i_nlink = fattr->cf_nlink;
 132         inode->i_uid = fattr->cf_uid;
 133         inode->i_gid = fattr->cf_gid;
 134
 135         /* if dynperm is set, don't clobber existing mode */
 136         if (inode->i_state & I_NEW ||
 137             !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM))
 138                 inode->i_mode = fattr->cf_mode;
 139
 140         cifs_i->cifsAttrs = fattr->cf_cifsattrs;
 141
 142         if (fattr->cf_flags & CIFS_FATTR_NEED_REVAL)
 143                 cifs_i->time = 0;
 144         else
 145                 cifs_i->time = jiffies;
 146
 147         cFYI(1, "inode 0x%p old_time=%ld new_time=%ld", inode,
 148                  oldtime, cifs_i->time);
 149
 150         cifs_i->delete_pending = fattr->cf_flags & CIFS_FATTR_DELETE_PENDING;
 151
 152         cifs_i->server_eof = fattr->cf_eof;
 153         /*
 154          * Can't safely change the file size here if the client is writing to
 155          * it due to potential races.
 156          */
 157         spin_lock(&inode->i_lock);
 158         if (is_size_safe_to_change(cifs_i, fattr->cf_eof)) {
 159                 i_size_write(inode, fattr->cf_eof);
 160
 161                 /*
 162                  * i_blocks is not related to (i_size / i_blksize),
 163                  * but instead 512 byte (2**9) size is required for
 164                  * calculating num blocks.
 165                  */
 166                 inode->i_blocks = (512 - 1 + fattr->cf_bytes) >> 9;
 167         }
 168         spin_unlock(&inode->i_lock);
 169
 170         cifs_set_ops(inode, fattr->cf_flags & CIFS_FATTR_DFS_REFERRAL);
 171 }
 172
 173 void
 174 cifs_fill_uniqueid(struct super_block *sb, struct cifs_fattr *fattr)
 175 {
 176         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 177
 178         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 179                 return;
 180
 181         fattr->cf_uniqueid = iunique(sb, ROOT_I);
 182 }
 183
 184 /* Fill a cifs_fattr struct with info from FILE_UNIX_BASIC_INFO. */
 185 void
 186 cifs_unix_basic_to_fattr(struct cifs_fattr *fattr, FILE_UNIX_BASIC_INFO *info,
 187                          struct cifs_sb_info *cifs_sb)
 188 {
 189         memset(fattr, 0, sizeof(*fattr));
 190         fattr->cf_uniqueid = le64_to_cpu(info->UniqueId);
 191         fattr->cf_bytes = le64_to_cpu(info->NumOfBytes);
 192         fattr->cf_eof = le64_to_cpu(info->EndOfFile);
 193
 194         fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
 195         fattr->cf_mtime = cifs_NTtimeToUnix(info->LastModificationTime);
 196         fattr->cf_ctime = cifs_NTtimeToUnix(info->LastStatusChange);
 197         fattr->cf_mode = le64_to_cpu(info->Permissions);
 198
 199         /*
 200          * Since we set the inode type below we need to mask off
 201          * to avoid strange results if bits set above.
 202          */
 203         fattr->cf_mode &= ~S_IFMT;
 204         switch (le32_to_cpu(info->Type)) {
 205         case UNIX_FILE:
 206                 fattr->cf_mode |= S_IFREG;
 207                 fattr->cf_dtype = DT_REG;
 208                 break;
 209         case UNIX_SYMLINK:
 210                 fattr->cf_mode |= S_IFLNK;
 211                 fattr->cf_dtype = DT_LNK;
 212                 break;
 213         case UNIX_DIR:
 214                 fattr->cf_mode |= S_IFDIR;
 215                 fattr->cf_dtype = DT_DIR;
 216                 break;
 217         case UNIX_CHARDEV:
 218                 fattr->cf_mode |= S_IFCHR;
 219                 fattr->cf_dtype = DT_CHR;
 220                 fattr->cf_rdev = MKDEV(le64_to_cpu(info->DevMajor),
 221                                        le64_to_cpu(info->DevMinor) & MINORMASK);
 222                 break;
 223         case UNIX_BLOCKDEV:
 224                 fattr->cf_mode |= S_IFBLK;
 225                 fattr->cf_dtype = DT_BLK;
 226                 fattr->cf_rdev = MKDEV(le64_to_cpu(info->DevMajor),
 227                                        le64_to_cpu(info->DevMinor) & MINORMASK);
 228                 break;
 229         case UNIX_FIFO:
 230                 fattr->cf_mode |= S_IFIFO;
 231                 fattr->cf_dtype = DT_FIFO;
 232                 break;
 233         case UNIX_SOCKET:
 234                 fattr->cf_mode |= S_IFSOCK;
 235                 fattr->cf_dtype = DT_SOCK;
 236                 break;
 237         default:
 238                 /* safest to call it a file if we do not know */
 239                 fattr->cf_mode |= S_IFREG;
 240                 fattr->cf_dtype = DT_REG;
 241                 cFYI(1, "unknown type %d", le32_to_cpu(info->Type));
 242                 break;
 243         }
 244
 245         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
 246                 fattr->cf_uid = cifs_sb->mnt_uid;
 247         else
 248                 fattr->cf_uid = le64_to_cpu(info->Uid);
 249
 250         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
 251                 fattr->cf_gid = cifs_sb->mnt_gid;
 252         else
 253                 fattr->cf_gid = le64_to_cpu(info->Gid);
 254
 255         fattr->cf_nlink = le64_to_cpu(info->Nlinks);
 256 }
 257
 258 /*
 259  * Fill a cifs_fattr struct with fake inode info.
 260  *
 261  * Needed to setup cifs_fattr data for the directory which is the
 262  * junction to the new submount (ie to setup the fake directory
 263  * which represents a DFS referral).
 264  */
 265 static void
 266 cifs_create_dfs_fattr(struct cifs_fattr *fattr, struct super_block *sb)
 267 {
 268         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 269
 270         cFYI(1, "creating fake fattr for DFS referral");
 271
 272         memset(fattr, 0, sizeof(*fattr));
 273         fattr->cf_mode = S_IFDIR | S_IXUGO | S_IRWXU;
 274         fattr->cf_uid = cifs_sb->mnt_uid;
 275         fattr->cf_gid = cifs_sb->mnt_gid;
 276         fattr->cf_atime = CURRENT_TIME;
 277         fattr->cf_ctime = CURRENT_TIME;
 278         fattr->cf_mtime = CURRENT_TIME;
 279         fattr->cf_nlink = 2;
 280         fattr->cf_flags |= CIFS_FATTR_DFS_REFERRAL;
 281 }
 282
 283 int cifs_get_file_info_unix(struct file *filp)
 284 {
 285         int rc;
 286         int xid;
 287         FILE_UNIX_BASIC_INFO find_data;
 288         struct cifs_fattr fattr;
 289         struct inode *inode = filp->f_path.dentry->d_inode;
 290         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 291         struct cifsFileInfo *cfile = filp->private_data;
 292         struct cifsTconInfo *tcon = tlink_tcon(cfile->tlink);
 293
 294         xid = GetXid();
 295         rc = CIFSSMBUnixQFileInfo(xid, tcon, cfile->netfid, &find_data);
 296         if (!rc) {
 297                 cifs_unix_basic_to_fattr(&fattr, &find_data, cifs_sb);
 298         } else if (rc == -EREMOTE) {
 299                 cifs_create_dfs_fattr(&fattr, inode->i_sb);
 300                 rc = 0;
 301         }
 302
 303         cifs_fattr_to_inode(inode, &fattr);
 304         FreeXid(xid);
 305         return rc;
 306 }
 307
 308 int cifs_get_inode_info_unix(struct inode **pinode,
 309                              const unsigned char *full_path,
 310                              struct super_block *sb, int xid)
 311 {
 312         int rc;
 313         FILE_UNIX_BASIC_INFO find_data;
 314         struct cifs_fattr fattr;
 315         struct cifsTconInfo *tcon;
 316         struct tcon_link *tlink;
 317         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 318
 319         cFYI(1, "Getting info on %s", full_path);
 320
 321         tlink = cifs_sb_tlink(cifs_sb);
 322         if (IS_ERR(tlink))
 323                 return PTR_ERR(tlink);
 324         tcon = tlink_tcon(tlink);
 325
 326         /* could have done a find first instead but this returns more info */
 327         rc = CIFSSMBUnixQPathInfo(xid, tcon, full_path, &find_data,
 328                                   cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
 329                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 330         cifs_put_tlink(tlink);
 331
 332         if (!rc) {
 333                 cifs_unix_basic_to_fattr(&fattr, &find_data, cifs_sb);
 334         } else if (rc == -EREMOTE) {
 335                 cifs_create_dfs_fattr(&fattr, sb);
 336                 rc = 0;
 337         } else {
 338                 return rc;
 339         }
 340
 341         /* check for Minshall+French symlinks */
 342         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
 343                 int tmprc = CIFSCheckMFSymlink(&fattr, full_path, cifs_sb, xid);
 344                 if (tmprc)
 345                         cFYI(1, "CIFSCheckMFSymlink: %d", tmprc);
 346         }
 347
 348         if (*pinode == NULL) {
 349                 /* get new inode */
 350                 cifs_fill_uniqueid(sb, &fattr);
 351                 *pinode = cifs_iget(sb, &fattr);
 352                 if (!*pinode)
 353                         rc = -ENOMEM;
 354         } else {
 355                 /* we already have inode, update it */
 356                 cifs_fattr_to_inode(*pinode, &fattr);
 357         }
 358
 359         return rc;
 360 }
 361
 362 static int
 363 cifs_sfu_type(struct cifs_fattr *fattr, const unsigned char *path,
 364               struct cifs_sb_info *cifs_sb, int xid)
 365 {
 366         int rc;
 367         int oplock = 0;
 368         __u16 netfid;
 369         struct tcon_link *tlink;
 370         struct cifsTconInfo *tcon;
 371         char buf[24];
 372         unsigned int bytes_read;
 373         char *pbuf;
 374
 375         pbuf = buf;
 376
 377         fattr->cf_mode &= ~S_IFMT;
 378
 379         if (fattr->cf_eof == 0) {
 380                 fattr->cf_mode |= S_IFIFO;
 381                 fattr->cf_dtype = DT_FIFO;
 382                 return 0;
 383         } else if (fattr->cf_eof < 8) {
 384                 fattr->cf_mode |= S_IFREG;
 385                 fattr->cf_dtype = DT_REG;
 386                 return -EINVAL;  /* EOPNOTSUPP? */
 387         }
 388
 389         tlink = cifs_sb_tlink(cifs_sb);
 390         if (IS_ERR(tlink))
 391                 return PTR_ERR(tlink);
 392         tcon = tlink_tcon(tlink);
 393
 394         rc = CIFSSMBOpen(xid, tcon, path, FILE_OPEN, GENERIC_READ,
 395                          CREATE_NOT_DIR, &netfid, &oplock, NULL,
 396                          cifs_sb->local_nls,
 397                          cifs_sb->mnt_cifs_flags &
 398                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 399         if (rc == 0) {
 400                 int buf_type = CIFS_NO_BUFFER;
 401                         /* Read header */
 402                 rc = CIFSSMBRead(xid, tcon, netfid,
 403                                  24 /* length */, 0 /* offset */,
 404                                  &bytes_read, &pbuf, &buf_type);
 405                 if ((rc == 0) && (bytes_read >= 8)) {
 406                         if (memcmp("IntxBLK", pbuf, 8) == 0) {
 407                                 cFYI(1, "Block device");
 408                                 fattr->cf_mode |= S_IFBLK;
 409                                 fattr->cf_dtype = DT_BLK;
 410                                 if (bytes_read == 24) {
 411                                         /* we have enough to decode dev num */
 412                                         __u64 mjr; /* major */
 413                                         __u64 mnr; /* minor */
 414                                         mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
 415                                         mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
 416                                         fattr->cf_rdev = MKDEV(mjr, mnr);
 417                                 }
 418                         } else if (memcmp("IntxCHR", pbuf, 8) == 0) {
 419                                 cFYI(1, "Char device");
 420                                 fattr->cf_mode |= S_IFCHR;
 421                                 fattr->cf_dtype = DT_CHR;
 422                                 if (bytes_read == 24) {
 423                                         /* we have enough to decode dev num */
 424                                         __u64 mjr; /* major */
 425                                         __u64 mnr; /* minor */
 426                                         mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
 427                                         mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
 428                                         fattr->cf_rdev = MKDEV(mjr, mnr);
 429                                 }
 430                         } else if (memcmp("IntxLNK", pbuf, 7) == 0) {
 431                                 cFYI(1, "Symlink");
 432                                 fattr->cf_mode |= S_IFLNK;
 433                                 fattr->cf_dtype = DT_LNK;
 434                         } else {
 435                                 fattr->cf_mode |= S_IFREG; /* file? */
 436                                 fattr->cf_dtype = DT_REG;
 437                                 rc = -EOPNOTSUPP;
 438                         }
 439                 } else {
 440                         fattr->cf_mode |= S_IFREG; /* then it is a file */
 441                         fattr->cf_dtype = DT_REG;
 442                         rc = -EOPNOTSUPP; /* or some unknown SFU type */
 443                 }
 444                 CIFSSMBClose(xid, tcon, netfid);
 445         }
 446         cifs_put_tlink(tlink);
 447         return rc;
 448 }
 449
 450 #define SFBITS_MASK (S_ISVTX | S_ISGID | S_ISUID)  /* SETFILEBITS valid bits */
 451
 452 /*
 453  * Fetch mode bits as provided by SFU.
 454  *
 455  * FIXME: Doesn't this clobber the type bit we got from cifs_sfu_type ?
 456  */
 457 static int cifs_sfu_mode(struct cifs_fattr *fattr, const unsigned char *path,
 458                          struct cifs_sb_info *cifs_sb, int xid)
 459 {
 460 #ifdef CONFIG_CIFS_XATTR
 461         ssize_t rc;
 462         char ea_value[4];
 463         __u32 mode;
 464         struct tcon_link *tlink;
 465         struct cifsTconInfo *tcon;
 466
 467         tlink = cifs_sb_tlink(cifs_sb);
 468         if (IS_ERR(tlink))
 469                 return PTR_ERR(tlink);
 470         tcon = tlink_tcon(tlink);
 471
 472         rc = CIFSSMBQAllEAs(xid, tcon, path, "SETFILEBITS",
 473                             ea_value, 4 /* size of buf */, cifs_sb->local_nls,
 474                             cifs_sb->mnt_cifs_flags &
 475                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 476         cifs_put_tlink(tlink);
 477         if (rc < 0)
 478                 return (int)rc;
 479         else if (rc > 3) {
 480                 mode = le32_to_cpu(*((__le32 *)ea_value));
 481                 fattr->cf_mode &= ~SFBITS_MASK;
 482                 cFYI(1, "special bits 0%o org mode 0%o", mode,
 483                          fattr->cf_mode);
 484                 fattr->cf_mode = (mode & SFBITS_MASK) | fattr->cf_mode;
 485                 cFYI(1, "special mode bits 0%o", mode);
 486         }
 487
 488         return 0;
 489 #else
 490         return -EOPNOTSUPP;
 491 #endif
 492 }
 493
 494 /* Fill a cifs_fattr struct with info from FILE_ALL_INFO */
 495 static void
 496 cifs_all_info_to_fattr(struct cifs_fattr *fattr, FILE_ALL_INFO *info,
 497                        struct cifs_sb_info *cifs_sb, bool adjust_tz)
 498 {
 499         struct cifsTconInfo *tcon = cifs_sb_master_tcon(cifs_sb);
 500
 501         memset(fattr, 0, sizeof(*fattr));
 502         fattr->cf_cifsattrs = le32_to_cpu(info->Attributes);
 503         if (info->DeletePending)
 504                 fattr->cf_flags |= CIFS_FATTR_DELETE_PENDING;
 505
 506         if (info->LastAccessTime)
 507                 fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
 508         else
 509                 fattr->cf_atime = CURRENT_TIME;
 510
 511         fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime);
 512         fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
 513
 514         if (adjust_tz) {
 515                 fattr->cf_ctime.tv_sec += tcon->ses->server->timeAdj;
 516                 fattr->cf_mtime.tv_sec += tcon->ses->server->timeAdj;
 517         }
 518
 519         fattr->cf_eof = le64_to_cpu(info->EndOfFile);
 520         fattr->cf_bytes = le64_to_cpu(info->AllocationSize);
 521
 522         if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
 523                 fattr->cf_mode = S_IFDIR | cifs_sb->mnt_dir_mode;
 524                 fattr->cf_dtype = DT_DIR;
 525         } else {
 526                 fattr->cf_mode = S_IFREG | cifs_sb->mnt_file_mode;
 527                 fattr->cf_dtype = DT_REG;
 528
 529                 /* clear write bits if ATTR_READONLY is set */
 530                 if (fattr->cf_cifsattrs & ATTR_READONLY)
 531                         fattr->cf_mode &= ~(S_IWUGO);
 532         }
 533
 534         fattr->cf_nlink = le32_to_cpu(info->NumberOfLinks);
 535
 536         fattr->cf_uid = cifs_sb->mnt_uid;
 537         fattr->cf_gid = cifs_sb->mnt_gid;
 538 }
 539
 540 int cifs_get_file_info(struct file *filp)
 541 {
 542         int rc;
 543         int xid;
 544         FILE_ALL_INFO find_data;
 545         struct cifs_fattr fattr;
 546         struct inode *inode = filp->f_path.dentry->d_inode;
 547         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 548         struct cifsFileInfo *cfile = filp->private_data;
 549         struct cifsTconInfo *tcon = tlink_tcon(cfile->tlink);
 550
 551         xid = GetXid();
 552         rc = CIFSSMBQFileInfo(xid, tcon, cfile->netfid, &find_data);
 553         if (rc == -EOPNOTSUPP || rc == -EINVAL) {
 554                 /*
 555                  * FIXME: legacy server -- fall back to path-based call?
 556                  * for now, just skip revalidating and mark inode for
 557                  * immediate reval.
 558                  */
 559                 rc = 0;
 560                 CIFS_I(inode)->time = 0;
 561                 goto cgfi_exit;
 562         } else if (rc == -EREMOTE) {
 563                 cifs_create_dfs_fattr(&fattr, inode->i_sb);
 564                 rc = 0;
 565         } else if (rc)
 566                 goto cgfi_exit;
 567
 568         /*
 569          * don't bother with SFU junk here -- just mark inode as needing
 570          * revalidation.
 571          */
 572         cifs_all_info_to_fattr(&fattr, &find_data, cifs_sb, false);
 573         fattr.cf_uniqueid = CIFS_I(inode)->uniqueid;
 574         fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
 575         cifs_fattr_to_inode(inode, &fattr);
 576 cgfi_exit:
 577         FreeXid(xid);
 578         return rc;
 579 }
 580
 581 int cifs_get_inode_info(struct inode **pinode,
 582         const unsigned char *full_path, FILE_ALL_INFO *pfindData,
 583         struct super_block *sb, int xid, const __u16 *pfid)
 584 {
 585         int rc = 0, tmprc;
 586         struct cifsTconInfo *pTcon;
 587         struct tcon_link *tlink;
 588         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 589         char *buf = NULL;
 590         bool adjustTZ = false;
 591         struct cifs_fattr fattr;
 592
 593         tlink = cifs_sb_tlink(cifs_sb);
 594         if (IS_ERR(tlink))
 595                 return PTR_ERR(tlink);
 596         pTcon = tlink_tcon(tlink);
 597
 598         cFYI(1, "Getting info on %s", full_path);
 599
 600         if ((pfindData == NULL) && (*pinode != NULL)) {
 601                 if (CIFS_I(*pinode)->clientCanCacheRead) {
 602                         cFYI(1, "No need to revalidate cached inode sizes");
 603                         goto cgii_exit;
 604                 }
 605         }
 606
 607         /* if file info not passed in then get it from server */
 608         if (pfindData == NULL) {
 609                 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
 610                 if (buf == NULL) {
 611                         rc = -ENOMEM;
 612                         goto cgii_exit;
 613                 }
 614                 pfindData = (FILE_ALL_INFO *)buf;
 615
 616                 /* could do find first instead but this returns more info */
 617                 rc = CIFSSMBQPathInfo(xid, pTcon, full_path, pfindData,
 618                               0 /* not legacy */,
 619                               cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
 620                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 621                 /* BB optimize code so we do not make the above call
 622                 when server claims no NT SMB support and the above call
 623                 failed at least once - set flag in tcon or mount */
 624                 if ((rc == -EOPNOTSUPP) || (rc == -EINVAL)) {
 625                         rc = SMBQueryInformation(xid, pTcon, full_path,
 626                                         pfindData, cifs_sb->local_nls,
 627                                         cifs_sb->mnt_cifs_flags &
 628                                           CIFS_MOUNT_MAP_SPECIAL_CHR);
 629                         adjustTZ = true;
 630                 }
 631         }
 632
 633         if (!rc) {
 634                 cifs_all_info_to_fattr(&fattr, (FILE_ALL_INFO *) pfindData,
 635                                        cifs_sb, adjustTZ);
 636         } else if (rc == -EREMOTE) {
 637                 cifs_create_dfs_fattr(&fattr, sb);
 638                 rc = 0;
 639         } else {
 640                 goto cgii_exit;
 641         }
 642
 643         /*
 644          * If an inode wasn't passed in, then get the inode number
 645          *
 646          * Is an i_ino of zero legal? Can we use that to check if the server
 647          * supports returning inode numbers?  Are there other sanity checks we
 648          * can use to ensure that the server is really filling in that field?
 649          *
 650          * We can not use the IndexNumber field by default from Windows or
 651          * Samba (in ALL_INFO buf) but we can request it explicitly. The SNIA
 652          * CIFS spec claims that this value is unique within the scope of a
 653          * share, and the windows docs hint that it's actually unique
 654          * per-machine.
 655          *
 656          * There may be higher info levels that work but are there Windows
 657          * server or network appliances for which IndexNumber field is not
 658          * guaranteed unique?
 659          */
 660         if (*pinode == NULL) {
 661                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 662                         int rc1 = 0;
 663
 664                         rc1 = CIFSGetSrvInodeNumber(xid, pTcon,
 665                                         full_path, &fattr.cf_uniqueid,
 666                                         cifs_sb->local_nls,
 667                                         cifs_sb->mnt_cifs_flags &
 668                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 669                         if (rc1 || !fattr.cf_uniqueid) {
 670                                 cFYI(1, "GetSrvInodeNum rc %d", rc1);
 671                                 fattr.cf_uniqueid = iunique(sb, ROOT_I);
 672                                 cifs_autodisable_serverino(cifs_sb);
 673                         }
 674                 } else {
 675                         fattr.cf_uniqueid = iunique(sb, ROOT_I);
 676                 }
 677         } else {
 678                 fattr.cf_uniqueid = CIFS_I(*pinode)->uniqueid;
 679         }
 680
 681         /* query for SFU type info if supported and needed */
 682         if (fattr.cf_cifsattrs & ATTR_SYSTEM &&
 683             cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
 684                 tmprc = cifs_sfu_type(&fattr, full_path, cifs_sb, xid);
 685                 if (tmprc)
 686                         cFYI(1, "cifs_sfu_type failed: %d", tmprc);
 687         }
 688
 689 #ifdef CONFIG_CIFS_ACL
 690         /* fill in 0777 bits from ACL */
 691         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
 692                 rc = cifs_acl_to_fattr(cifs_sb, &fattr, *pinode, full_path,
 693                                                 pfid);
 694                 if (rc) {
 695                         cFYI(1, "%s: Getting ACL failed with error: %d",
 696                                 __func__, rc);
 697                         goto cgii_exit;
 698                 }
 699         }
 700 #endif /* CONFIG_CIFS_ACL */
 701
 702         /* fill in remaining high mode bits e.g. SUID, VTX */
 703         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
 704                 cifs_sfu_mode(&fattr, full_path, cifs_sb, xid);
 705
 706         /* check for Minshall+French symlinks */
 707         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
 708                 tmprc = CIFSCheckMFSymlink(&fattr, full_path, cifs_sb, xid);
 709                 if (tmprc)
 710                         cFYI(1, "CIFSCheckMFSymlink: %d", tmprc);
 711         }
 712
 713         if (!*pinode) {
 714                 *pinode = cifs_iget(sb, &fattr);
 715                 if (!*pinode)
 716                         rc = -ENOMEM;
 717         } else {
 718                 cifs_fattr_to_inode(*pinode, &fattr);
 719         }
 720
 721 cgii_exit:
 722         kfree(buf);
 723         cifs_put_tlink(tlink);
 724         return rc;
 725 }
 726
 727 static const struct inode_operations cifs_ipc_inode_ops = {
 728         .lookup = cifs_lookup,
 729 };
 730
 731 char *cifs_build_path_to_root(struct cifs_sb_info *cifs_sb,
 732                                 struct cifsTconInfo *tcon)
 733 {
 734         int pplen = cifs_sb->prepathlen;
 735         int dfsplen;
 736         char *full_path = NULL;
 737
 738         /* if no prefix path, simply set path to the root of share to "" */
 739         if (pplen == 0) {
 740                 full_path = kmalloc(1, GFP_KERNEL);
 741                 if (full_path)
 742                         full_path[0] = 0;
 743                 return full_path;
 744         }
 745
 746         if (tcon->Flags & SMB_SHARE_IS_IN_DFS)
 747                 dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
 748         else
 749                 dfsplen = 0;
 750
 751         full_path = kmalloc(dfsplen + pplen + 1, GFP_KERNEL);
 752         if (full_path == NULL)
 753                 return full_path;
 754
 755         if (dfsplen) {
 756                 strncpy(full_path, tcon->treeName, dfsplen);
 757                 /* switch slash direction in prepath depending on whether
 758                  * windows or posix style path names
 759                  */
 760                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
 761                         int i;
 762                         for (i = 0; i < dfsplen; i++) {
 763                                 if (full_path[i] == '\\')
 764                                         full_path[i] = '/';
 765                         }
 766                 }
 767         }
 768         strncpy(full_path + dfsplen, cifs_sb->prepath, pplen);
 769         full_path[dfsplen + pplen] = 0; /* add trailing null */
 770         return full_path;
 771 }
 772
 773 static int
 774 cifs_find_inode(struct inode *inode, void *opaque)
 775 {
 776         struct cifs_fattr *fattr = (struct cifs_fattr *) opaque;
 777
 778         /* don't match inode with different uniqueid */
 779         if (CIFS_I(inode)->uniqueid != fattr->cf_uniqueid)
 780                 return 0;
 781
 782         /* don't match inode of different type */
 783         if ((inode->i_mode & S_IFMT) != (fattr->cf_mode & S_IFMT))
 784                 return 0;
 785
 786         /* if it's not a directory or has no dentries, then flag it */
 787         if (S_ISDIR(inode->i_mode) && !list_empty(&inode->i_dentry))
 788                 fattr->cf_flags |= CIFS_FATTR_INO_COLLISION;
 789
 790         return 1;
 791 }
 792
 793 static int
 794 cifs_init_inode(struct inode *inode, void *opaque)
 795 {
 796         struct cifs_fattr *fattr = (struct cifs_fattr *) opaque;
 797
 798         CIFS_I(inode)->uniqueid = fattr->cf_uniqueid;
 799         return 0;
 800 }
 801
 802 /*
 803  * walk dentry list for an inode and report whether it has aliases that
 804  * are hashed. We use this to determine if a directory inode can actually
 805  * be used.
 806  */
 807 static bool
 808 inode_has_hashed_dentries(struct inode *inode)
 809 {
 810         struct dentry *dentry;
 811
 812         spin_lock(&inode->i_lock);
 813         list_for_each_entry(dentry, &inode->i_dentry, d_alias) {
 814                 if (!d_unhashed(dentry) || IS_ROOT(dentry)) {
 815                         spin_unlock(&inode->i_lock);
 816                         return true;
 817                 }
 818         }
 819         spin_unlock(&inode->i_lock);
 820         return false;
 821 }
 822
 823 /* Given fattrs, get a corresponding inode */
 824 struct inode *
 825 cifs_iget(struct super_block *sb, struct cifs_fattr *fattr)
 826 {
 827         unsigned long hash;
 828         struct inode *inode;
 829
 830 retry_iget5_locked:
 831         cFYI(1, "looking for uniqueid=%llu", fattr->cf_uniqueid);
 832
 833         /* hash down to 32-bits on 32-bit arch */
 834         hash = cifs_uniqueid_to_ino_t(fattr->cf_uniqueid);
 835
 836         inode = iget5_locked(sb, hash, cifs_find_inode, cifs_init_inode, fattr);
 837         if (inode) {
 838                 /* was there a potentially problematic inode collision? */
 839                 if (fattr->cf_flags & CIFS_FATTR_INO_COLLISION) {
 840                         fattr->cf_flags &= ~CIFS_FATTR_INO_COLLISION;
 841
 842                         if (inode_has_hashed_dentries(inode)) {
 843                                 cifs_autodisable_serverino(CIFS_SB(sb));
 844                                 iput(inode);
 845                                 fattr->cf_uniqueid = iunique(sb, ROOT_I);
 846                                 goto retry_iget5_locked;
 847                         }
 848                 }
 849
 850                 cifs_fattr_to_inode(inode, fattr);
 851                 if (sb->s_flags & MS_NOATIME)
 852                         inode->i_flags |= S_NOATIME | S_NOCMTIME;
 853                 if (inode->i_state & I_NEW) {
 854                         inode->i_ino = hash;
 855                         if (S_ISREG(inode->i_mode))
 856                                 inode->i_data.backing_dev_info = sb->s_bdi;
 857 #ifdef CONFIG_CIFS_FSCACHE
 858                         /* initialize per-inode cache cookie pointer */
 859                         CIFS_I(inode)->fscache = NULL;
 860 #endif
 861                         unlock_new_inode(inode);
 862                 }
 863         }
 864
 865         return inode;
 866 }
 867
 868 /* gets root inode */
 869 struct inode *cifs_root_iget(struct super_block *sb, unsigned long ino)
 870 {
 871         int xid;
 872         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 873         struct inode *inode = NULL;
 874         long rc;
 875         char *full_path;
 876         struct cifsTconInfo *tcon = cifs_sb_master_tcon(cifs_sb);
 877
 878         full_path = cifs_build_path_to_root(cifs_sb, tcon);
 879         if (full_path == NULL)
 880                 return ERR_PTR(-ENOMEM);
 881
 882         xid = GetXid();
 883         if (tcon->unix_ext)
 884                 rc = cifs_get_inode_info_unix(&inode, full_path, sb, xid);
 885         else
 886                 rc = cifs_get_inode_info(&inode, full_path, NULL, sb,
 887                                                 xid, NULL);
 888
 889         if (!inode) {
 890                 inode = ERR_PTR(rc);
 891                 goto out;
 892         }
 893
 894 #ifdef CONFIG_CIFS_FSCACHE
 895         /* populate tcon->resource_id */
 896         tcon->resource_id = CIFS_I(inode)->uniqueid;
 897 #endif
 898
 899         if (rc && tcon->ipc) {
 900                 cFYI(1, "ipc connection - fake read inode");
 901                 inode->i_mode |= S_IFDIR;
 902                 inode->i_nlink = 2;
 903                 inode->i_op = &cifs_ipc_inode_ops;
 904                 inode->i_fop = &simple_dir_operations;
 905                 inode->i_uid = cifs_sb->mnt_uid;
 906                 inode->i_gid = cifs_sb->mnt_gid;
 907         } else if (rc) {
 908                 iget_failed(inode);
 909                 inode = ERR_PTR(rc);
 910         }
 911
 912 out:
 913         kfree(full_path);
 914         /* can not call macro FreeXid here since in a void func
 915          * TODO: This is no longer true
 916          */
 917         _FreeXid(xid);
 918         return inode;
 919 }
 920
 921 static int
 922 cifs_set_file_info(struct inode *inode, struct iattr *attrs, int xid,
 923                     char *full_path, __u32 dosattr)
 924 {
 925         int rc;
 926         int oplock = 0;
 927         __u16 netfid;
 928         __u32 netpid;
 929         bool set_time = false;
 930         struct cifsFileInfo *open_file;
 931         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
 932         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 933         struct tcon_link *tlink = NULL;
 934         struct cifsTconInfo *pTcon;
 935         FILE_BASIC_INFO info_buf;
 936
 937         if (attrs == NULL)
 938                 return -EINVAL;
 939
 940         if (attrs->ia_valid & ATTR_ATIME) {
 941                 set_time = true;
 942                 info_buf.LastAccessTime =
 943                         cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
 944         } else
 945                 info_buf.LastAccessTime = 0;
 946
 947         if (attrs->ia_valid & ATTR_MTIME) {
 948                 set_time = true;
 949                 info_buf.LastWriteTime =
 950                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
 951         } else
 952                 info_buf.LastWriteTime = 0;
 953
 954         /*
 955          * Samba throws this field away, but windows may actually use it.
 956          * Do not set ctime unless other time stamps are changed explicitly
 957          * (i.e. by utimes()) since we would then have a mix of client and
 958          * server times.
 959          */
 960         if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
 961                 cFYI(1, "CIFS - CTIME changed");
 962                 info_buf.ChangeTime =
 963                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
 964         } else
 965                 info_buf.ChangeTime = 0;
 966
 967         info_buf.CreationTime = 0;      /* don't change */
 968         info_buf.Attributes = cpu_to_le32(dosattr);
 969
 970         /*
 971          * If the file is already open for write, just use that fileid
 972          */
 973         open_file = find_writable_file(cifsInode, true);
 974         if (open_file) {
 975                 netfid = open_file->netfid;
 976                 netpid = open_file->pid;
 977                 pTcon = tlink_tcon(open_file->tlink);
 978                 goto set_via_filehandle;
 979         }
 980
 981         tlink = cifs_sb_tlink(cifs_sb);
 982         if (IS_ERR(tlink)) {
 983                 rc = PTR_ERR(tlink);
 984                 tlink = NULL;
 985                 goto out;
 986         }
 987         pTcon = tlink_tcon(tlink);
 988
 989         /*
 990          * NT4 apparently returns success on this call, but it doesn't
 991          * really work.
 992          */
 993         if (!(pTcon->ses->flags & CIFS_SES_NT4)) {
 994                 rc = CIFSSMBSetPathInfo(xid, pTcon, full_path,
 995                                      &info_buf, cifs_sb->local_nls,
 996                                      cifs_sb->mnt_cifs_flags &
 997                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 998                 if (rc == 0) {
 999                         cifsInode->cifsAttrs = dosattr;
1000                         goto out;
1001                 } else if (rc != -EOPNOTSUPP && rc != -EINVAL)
1002                         goto out;
1003         }
1004
1005         cFYI(1, "calling SetFileInfo since SetPathInfo for "
1006                  "times not supported by this server");
1007         rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
1008                          SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
1009                          CREATE_NOT_DIR, &netfid, &oplock,
1010                          NULL, cifs_sb->local_nls,
1011                          cifs_sb->mnt_cifs_flags &
1012                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1013
1014         if (rc != 0) {
1015                 if (rc == -EIO)
1016                         rc = -EINVAL;
1017                 goto out;
1018         }
1019
1020         netpid = current->tgid;
1021
1022 set_via_filehandle:
1023         rc = CIFSSMBSetFileInfo(xid, pTcon, &info_buf, netfid, netpid);
1024         if (!rc)
1025                 cifsInode->cifsAttrs = dosattr;
1026
1027         if (open_file == NULL)
1028                 CIFSSMBClose(xid, pTcon, netfid);
1029         else
1030                 cifsFileInfo_put(open_file);
1031 out:
1032         if (tlink != NULL)
1033                 cifs_put_tlink(tlink);
1034         return rc;
1035 }
1036
1037 /*
1038  * open the given file (if it isn't already), set the DELETE_ON_CLOSE bit
1039  * and rename it to a random name that hopefully won't conflict with
1040  * anything else.
1041  */
1042 static int
1043 cifs_rename_pending_delete(char *full_path, struct dentry *dentry, int xid)
1044 {
1045         int oplock = 0;
1046         int rc;
1047         __u16 netfid;
1048         struct inode *inode = dentry->d_inode;
1049         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1050         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1051         struct tcon_link *tlink;
1052         struct cifsTconInfo *tcon;
1053         __u32 dosattr, origattr;
1054         FILE_BASIC_INFO *info_buf = NULL;
1055
1056         tlink = cifs_sb_tlink(cifs_sb);
1057         if (IS_ERR(tlink))
1058                 return PTR_ERR(tlink);
1059         tcon = tlink_tcon(tlink);
1060
1061         rc = CIFSSMBOpen(xid, tcon, full_path, FILE_OPEN,
1062                          DELETE|FILE_WRITE_ATTRIBUTES, CREATE_NOT_DIR,
1063                          &netfid, &oplock, NULL, cifs_sb->local_nls,
1064                          cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1065         if (rc != 0)
1066                 goto out;
1067
1068         origattr = cifsInode->cifsAttrs;
1069         if (origattr == 0)
1070                 origattr |= ATTR_NORMAL;
1071
1072         dosattr = origattr & ~ATTR_READONLY;
1073         if (dosattr == 0)
1074                 dosattr |= ATTR_NORMAL;
1075         dosattr |= ATTR_HIDDEN;
1076
1077         /* set ATTR_HIDDEN and clear ATTR_READONLY, but only if needed */
1078         if (dosattr != origattr) {
1079                 info_buf = kzalloc(sizeof(*info_buf), GFP_KERNEL);
1080                 if (info_buf == NULL) {
1081                         rc = -ENOMEM;
1082                         goto out_close;
1083                 }
1084                 info_buf->Attributes = cpu_to_le32(dosattr);
1085                 rc = CIFSSMBSetFileInfo(xid, tcon, info_buf, netfid,
1086                                         current->tgid);
1087                 /* although we would like to mark the file hidden
1088                    if that fails we will still try to rename it */
1089                 if (rc != 0)
1090                         cifsInode->cifsAttrs = dosattr;
1091                 else
1092                         dosattr = origattr; /* since not able to change them */
1093         }
1094
1095         /* rename the file */
1096         rc = CIFSSMBRenameOpenFile(xid, tcon, netfid, NULL, cifs_sb->local_nls,
1097                                    cifs_sb->mnt_cifs_flags &
1098                                             CIFS_MOUNT_MAP_SPECIAL_CHR);
1099         if (rc != 0) {
1100                 rc = -ETXTBSY;
1101                 goto undo_setattr;
1102         }
1103
1104         /* try to set DELETE_ON_CLOSE */
1105         if (!cifsInode->delete_pending) {
1106                 rc = CIFSSMBSetFileDisposition(xid, tcon, true, netfid,
1107                                                current->tgid);
1108                 /*
1109                  * some samba versions return -ENOENT when we try to set the
1110                  * file disposition here. Likely a samba bug, but work around
1111                  * it for now. This means that some cifsXXX files may hang
1112                  * around after they shouldn't.
1113                  *
1114                  * BB: remove this hack after more servers have the fix
1115                  */
1116                 if (rc == -ENOENT)
1117                         rc = 0;
1118                 else if (rc != 0) {
1119                         rc = -ETXTBSY;
1120                         goto undo_rename;
1121                 }
1122                 cifsInode->delete_pending = true;
1123         }
1124
1125 out_close:
1126         CIFSSMBClose(xid, tcon, netfid);
1127 out:
1128         kfree(info_buf);
1129         cifs_put_tlink(tlink);
1130         return rc;
1131
1132         /*
1133          * reset everything back to the original state. Don't bother
1134          * dealing with errors here since we can't do anything about
1135          * them anyway.
1136          */
1137 undo_rename:
1138         CIFSSMBRenameOpenFile(xid, tcon, netfid, dentry->d_name.name,
1139                                 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1140                                             CIFS_MOUNT_MAP_SPECIAL_CHR);
1141 undo_setattr:
1142         if (dosattr != origattr) {
1143                 info_buf->Attributes = cpu_to_le32(origattr);
1144                 if (!CIFSSMBSetFileInfo(xid, tcon, info_buf, netfid,
1145                                         current->tgid))
1146                         cifsInode->cifsAttrs = origattr;
1147         }
1148
1149         goto out_close;
1150 }
1151
1152
1153 /*
1154  * If dentry->d_inode is null (usually meaning the cached dentry
1155  * is a negative dentry) then we would attempt a standard SMB delete, but
1156  * if that fails we can not attempt the fall back mechanisms on EACCESS
1157  * but will return the EACCESS to the caller. Note that the VFS does not call
1158  * unlink on negative dentries currently.
1159  */
1160 int cifs_unlink(struct inode *dir, struct dentry *dentry)
1161 {
1162         int rc = 0;
1163         int xid;
1164         char *full_path = NULL;
1165         struct inode *inode = dentry->d_inode;
1166         struct cifsInodeInfo *cifs_inode;
1167         struct super_block *sb = dir->i_sb;
1168         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
1169         struct tcon_link *tlink;
1170         struct cifsTconInfo *tcon;
1171         struct iattr *attrs = NULL;
1172         __u32 dosattr = 0, origattr = 0;
1173
1174         cFYI(1, "cifs_unlink, dir=0x%p, dentry=0x%p", dir, dentry);
1175
1176         tlink = cifs_sb_tlink(cifs_sb);
1177         if (IS_ERR(tlink))
1178                 return PTR_ERR(tlink);
1179         tcon = tlink_tcon(tlink);
1180
1181         xid = GetXid();
1182
1183         /* Unlink can be called from rename so we can not take the
1184          * sb->s_vfs_rename_mutex here */
1185         full_path = build_path_from_dentry(dentry);
1186         if (full_path == NULL) {
1187                 rc = -ENOMEM;
1188                 goto unlink_out;
1189         }
1190
1191         if ((tcon->ses->capabilities & CAP_UNIX) &&
1192                 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
1193                         le64_to_cpu(tcon->fsUnixInfo.Capability))) {
1194                 rc = CIFSPOSIXDelFile(xid, tcon, full_path,
1195                         SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls,
1196                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1197                 cFYI(1, "posix del rc %d", rc);
1198                 if ((rc == 0) || (rc == -ENOENT))
1199                         goto psx_del_no_retry;
1200         }
1201
1202 retry_std_delete:
1203         rc = CIFSSMBDelFile(xid, tcon, full_path, cifs_sb->local_nls,
1204                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1205
1206 psx_del_no_retry:
1207         if (!rc) {
1208                 if (inode)
1209                         drop_nlink(inode);
1210         } else if (rc == -ENOENT) {
1211                 d_drop(dentry);
1212         } else if (rc == -ETXTBSY) {
1213                 rc = cifs_rename_pending_delete(full_path, dentry, xid);
1214                 if (rc == 0)
1215                         drop_nlink(inode);
1216         } else if ((rc == -EACCES) && (dosattr == 0) && inode) {
1217                 attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
1218                 if (attrs == NULL) {
1219                         rc = -ENOMEM;
1220                         goto out_reval;
1221                 }
1222
1223                 /* try to reset dos attributes */
1224                 cifs_inode = CIFS_I(inode);
1225                 origattr = cifs_inode->cifsAttrs;
1226                 if (origattr == 0)
1227                         origattr |= ATTR_NORMAL;
1228                 dosattr = origattr & ~ATTR_READONLY;
1229                 if (dosattr == 0)
1230                         dosattr |= ATTR_NORMAL;
1231                 dosattr |= ATTR_HIDDEN;
1232
1233                 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
1234                 if (rc != 0)
1235                         goto out_reval;
1236
1237                 goto retry_std_delete;
1238         }
1239
1240         /* undo the setattr if we errored out and it's needed */
1241         if (rc != 0 && dosattr != 0)
1242                 cifs_set_file_info(inode, attrs, xid, full_path, origattr);
1243
1244 out_reval:
1245         if (inode) {
1246                 cifs_inode = CIFS_I(inode);
1247                 cifs_inode->time = 0;   /* will force revalidate to get info
1248                                            when needed */
1249                 inode->i_ctime = current_fs_time(sb);
1250         }
1251         dir->i_ctime = dir->i_mtime = current_fs_time(sb);
1252         cifs_inode = CIFS_I(dir);
1253         CIFS_I(dir)->time = 0;  /* force revalidate of dir as well */
1254 unlink_out:
1255         kfree(full_path);
1256         kfree(attrs);
1257         FreeXid(xid);
1258         cifs_put_tlink(tlink);
1259         return rc;
1260 }
1261
1262 int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
1263 {
1264         int rc = 0, tmprc;
1265         int xid;
1266         struct cifs_sb_info *cifs_sb;
1267         struct tcon_link *tlink;
1268         struct cifsTconInfo *pTcon;
1269         char *full_path = NULL;
1270         struct inode *newinode = NULL;
1271         struct cifs_fattr fattr;
1272
1273         cFYI(1, "In cifs_mkdir, mode = 0x%x inode = 0x%p", mode, inode);
1274
1275         cifs_sb = CIFS_SB(inode->i_sb);
1276         tlink = cifs_sb_tlink(cifs_sb);
1277         if (IS_ERR(tlink))
1278                 return PTR_ERR(tlink);
1279         pTcon = tlink_tcon(tlink);
1280
1281         xid = GetXid();
1282
1283         full_path = build_path_from_dentry(direntry);
1284         if (full_path == NULL) {
1285                 rc = -ENOMEM;
1286                 goto mkdir_out;
1287         }
1288
1289         if ((pTcon->ses->capabilities & CAP_UNIX) &&
1290                 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
1291                         le64_to_cpu(pTcon->fsUnixInfo.Capability))) {
1292                 u32 oplock = 0;
1293                 FILE_UNIX_BASIC_INFO *pInfo =
1294                         kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
1295                 if (pInfo == NULL) {
1296                         rc = -ENOMEM;
1297                         goto mkdir_out;
1298                 }
1299
1300                 mode &= ~current_umask();
1301                 rc = CIFSPOSIXCreate(xid, pTcon, SMB_O_DIRECTORY | SMB_O_CREAT,
1302                                 mode, NULL /* netfid */, pInfo, &oplock,
1303                                 full_path, cifs_sb->local_nls,
1304                                 cifs_sb->mnt_cifs_flags &
1305                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1306                 if (rc == -EOPNOTSUPP) {
1307                         kfree(pInfo);
1308                         goto mkdir_retry_old;
1309                 } else if (rc) {
1310                         cFYI(1, "posix mkdir returned 0x%x", rc);
1311                         d_drop(direntry);
1312                 } else {
1313                         if (pInfo->Type == cpu_to_le32(-1)) {
1314                                 /* no return info, go query for it */
1315                                 kfree(pInfo);
1316                                 goto mkdir_get_info;
1317                         }
1318 /*BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if need
1319         to set uid/gid */
1320                         inc_nlink(inode);
1321                         if (pTcon->nocase)
1322                                 d_set_d_op(direntry, &cifs_ci_dentry_ops);
1323                         else
1324                                 d_set_d_op(direntry, &cifs_dentry_ops);
1325
1326                         cifs_unix_basic_to_fattr(&fattr, pInfo, cifs_sb);
1327                         cifs_fill_uniqueid(inode->i_sb, &fattr);
1328                         newinode = cifs_iget(inode->i_sb, &fattr);
1329                         if (!newinode) {
1330                                 kfree(pInfo);
1331                                 goto mkdir_get_info;
1332                         }
1333
1334                         d_instantiate(direntry, newinode);
1335
1336 #ifdef CONFIG_CIFS_DEBUG2
1337                         cFYI(1, "instantiated dentry %p %s to inode %p",
1338                                 direntry, direntry->d_name.name, newinode);
1339
1340                         if (newinode->i_nlink != 2)
1341                                 cFYI(1, "unexpected number of links %d",
1342                                         newinode->i_nlink);
1343 #endif
1344                 }
1345                 kfree(pInfo);
1346                 goto mkdir_out;
1347         }
1348 mkdir_retry_old:
1349         /* BB add setting the equivalent of mode via CreateX w/ACLs */
1350         rc = CIFSSMBMkDir(xid, pTcon, full_path, cifs_sb->local_nls,
1351                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1352         if (rc) {
1353                 cFYI(1, "cifs_mkdir returned 0x%x", rc);
1354                 d_drop(direntry);
1355         } else {
1356 mkdir_get_info:
1357                 inc_nlink(inode);
1358                 if (pTcon->unix_ext)
1359                         rc = cifs_get_inode_info_unix(&newinode, full_path,
1360                                                       inode->i_sb, xid);
1361                 else
1362                         rc = cifs_get_inode_info(&newinode, full_path, NULL,
1363                                                  inode->i_sb, xid, NULL);
1364
1365                 if (pTcon->nocase)
1366                         d_set_d_op(direntry, &cifs_ci_dentry_ops);
1367                 else
1368                         d_set_d_op(direntry, &cifs_dentry_ops);
1369                 d_instantiate(direntry, newinode);
1370                  /* setting nlink not necessary except in cases where we
1371                   * failed to get it from the server or was set bogus */
1372                 if ((direntry->d_inode) && (direntry->d_inode->i_nlink < 2))
1373                                 direntry->d_inode->i_nlink = 2;
1374
1375                 mode &= ~current_umask();
1376                 /* must turn on setgid bit if parent dir has it */
1377                 if (inode->i_mode & S_ISGID)
1378                         mode |= S_ISGID;
1379
1380                 if (pTcon->unix_ext) {
1381                         struct cifs_unix_set_info_args args = {
1382                                 .mode   = mode,
1383                                 .ctime  = NO_CHANGE_64,
1384                                 .atime  = NO_CHANGE_64,
1385                                 .mtime  = NO_CHANGE_64,
1386                                 .device = 0,
1387                         };
1388                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1389                                 args.uid = (__u64)current_fsuid();
1390                                 if (inode->i_mode & S_ISGID)
1391                                         args.gid = (__u64)inode->i_gid;
1392                                 else
1393                                         args.gid = (__u64)current_fsgid();
1394                         } else {
1395                                 args.uid = NO_CHANGE_64;
1396                                 args.gid = NO_CHANGE_64;
1397                         }
1398                         CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, &args,
1399                                                cifs_sb->local_nls,
1400                                                cifs_sb->mnt_cifs_flags &
1401                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1402                 } else {
1403                         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
1404                             (mode & S_IWUGO) == 0) {
1405                                 FILE_BASIC_INFO pInfo;
1406                                 struct cifsInodeInfo *cifsInode;
1407                                 u32 dosattrs;
1408
1409                                 memset(&pInfo, 0, sizeof(pInfo));
1410                                 cifsInode = CIFS_I(newinode);
1411                                 dosattrs = cifsInode->cifsAttrs|ATTR_READONLY;
1412                                 pInfo.Attributes = cpu_to_le32(dosattrs);
1413                                 tmprc = CIFSSMBSetPathInfo(xid, pTcon,
1414                                                 full_path, &pInfo,
1415                                                 cifs_sb->local_nls,
1416                                                 cifs_sb->mnt_cifs_flags &
1417                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1418                                 if (tmprc == 0)
1419                                         cifsInode->cifsAttrs = dosattrs;
1420                         }
1421                         if (direntry->d_inode) {
1422                                 if (cifs_sb->mnt_cifs_flags &
1423                                      CIFS_MOUNT_DYNPERM)
1424                                         direntry->d_inode->i_mode =
1425                                                 (mode | S_IFDIR);
1426
1427                                 if (cifs_sb->mnt_cifs_flags &
1428                                      CIFS_MOUNT_SET_UID) {
1429                                         direntry->d_inode->i_uid =
1430                                                 current_fsuid();
1431                                         if (inode->i_mode & S_ISGID)
1432                                                 direntry->d_inode->i_gid =
1433                                                         inode->i_gid;
1434                                         else
1435                                                 direntry->d_inode->i_gid =
1436                                                         current_fsgid();
1437                                 }
1438                         }
1439                 }
1440         }
1441 mkdir_out:
1442         kfree(full_path);
1443         FreeXid(xid);
1444         cifs_put_tlink(tlink);
1445         return rc;
1446 }
1447
1448 int cifs_rmdir(struct inode *inode, struct dentry *direntry)
1449 {
1450         int rc = 0;
1451         int xid;
1452         struct cifs_sb_info *cifs_sb;
1453         struct tcon_link *tlink;
1454         struct cifsTconInfo *pTcon;
1455         char *full_path = NULL;
1456         struct cifsInodeInfo *cifsInode;
1457
1458         cFYI(1, "cifs_rmdir, inode = 0x%p", inode);
1459
1460         xid = GetXid();
1461
1462         full_path = build_path_from_dentry(direntry);
1463         if (full_path == NULL) {
1464                 rc = -ENOMEM;
1465                 goto rmdir_exit;
1466         }
1467
1468         cifs_sb = CIFS_SB(inode->i_sb);
1469         tlink = cifs_sb_tlink(cifs_sb);
1470         if (IS_ERR(tlink)) {
1471                 rc = PTR_ERR(tlink);
1472                 goto rmdir_exit;
1473         }
1474         pTcon = tlink_tcon(tlink);
1475
1476         rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls,
1477                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1478         cifs_put_tlink(tlink);
1479
1480         if (!rc) {
1481                 drop_nlink(inode);
1482                 spin_lock(&direntry->d_inode->i_lock);
1483                 i_size_write(direntry->d_inode, 0);
1484                 clear_nlink(direntry->d_inode);
1485                 spin_unlock(&direntry->d_inode->i_lock);
1486         }
1487
1488         cifsInode = CIFS_I(direntry->d_inode);
1489         cifsInode->time = 0;    /* force revalidate to go get info when
1490                                    needed */
1491
1492         cifsInode = CIFS_I(inode);
1493         cifsInode->time = 0;    /* force revalidate to get parent dir info
1494                                    since cached search results now invalid */
1495
1496         direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
1497                 current_fs_time(inode->i_sb);
1498
1499 rmdir_exit:
1500         kfree(full_path);
1501         FreeXid(xid);
1502         return rc;
1503 }
1504
1505 static int
1506 cifs_do_rename(int xid, struct dentry *from_dentry, const char *fromPath,
1507                 struct dentry *to_dentry, const char *toPath)
1508 {
1509         struct cifs_sb_info *cifs_sb = CIFS_SB(from_dentry->d_sb);
1510         struct tcon_link *tlink;
1511         struct cifsTconInfo *pTcon;
1512         __u16 srcfid;
1513         int oplock, rc;
1514
1515         tlink = cifs_sb_tlink(cifs_sb);
1516         if (IS_ERR(tlink))
1517                 return PTR_ERR(tlink);
1518         pTcon = tlink_tcon(tlink);
1519
1520         /* try path-based rename first */
1521         rc = CIFSSMBRename(xid, pTcon, fromPath, toPath, cifs_sb->local_nls,
1522                            cifs_sb->mnt_cifs_flags &
1523                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1524
1525         /*
1526          * don't bother with rename by filehandle unless file is busy and
1527          * source Note that cross directory moves do not work with
1528          * rename by filehandle to various Windows servers.
1529          */
1530         if (rc == 0 || rc != -ETXTBSY)
1531                 goto do_rename_exit;
1532
1533         /* open-file renames don't work across directories */
1534         if (to_dentry->d_parent != from_dentry->d_parent)
1535                 goto do_rename_exit;
1536
1537         /* open the file to be renamed -- we need DELETE perms */
1538         rc = CIFSSMBOpen(xid, pTcon, fromPath, FILE_OPEN, DELETE,
1539                          CREATE_NOT_DIR, &srcfid, &oplock, NULL,
1540                          cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1541                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1542
1543         if (rc == 0) {
1544                 rc = CIFSSMBRenameOpenFile(xid, pTcon, srcfid,
1545                                 (const char *) to_dentry->d_name.name,
1546                                 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1547                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1548
1549                 CIFSSMBClose(xid, pTcon, srcfid);
1550         }
1551 do_rename_exit:
1552         cifs_put_tlink(tlink);
1553         return rc;
1554 }
1555
1556 int cifs_rename(struct inode *source_dir, struct dentry *source_dentry,
1557         struct inode *target_dir, struct dentry *target_dentry)
1558 {
1559         char *fromName = NULL;
1560         char *toName = NULL;
1561         struct cifs_sb_info *cifs_sb;
1562         struct tcon_link *tlink;
1563         struct cifsTconInfo *tcon;
1564         FILE_UNIX_BASIC_INFO *info_buf_source = NULL;
1565         FILE_UNIX_BASIC_INFO *info_buf_target;
1566         int xid, rc, tmprc;
1567
1568         cifs_sb = CIFS_SB(source_dir->i_sb);
1569         tlink = cifs_sb_tlink(cifs_sb);
1570         if (IS_ERR(tlink))
1571                 return PTR_ERR(tlink);
1572         tcon = tlink_tcon(tlink);
1573
1574         xid = GetXid();
1575
1576         /*
1577          * we already have the rename sem so we do not need to
1578          * grab it again here to protect the path integrity
1579          */
1580         fromName = build_path_from_dentry(source_dentry);
1581         if (fromName == NULL) {
1582                 rc = -ENOMEM;
1583                 goto cifs_rename_exit;
1584         }
1585
1586         toName = build_path_from_dentry(target_dentry);
1587         if (toName == NULL) {
1588                 rc = -ENOMEM;
1589                 goto cifs_rename_exit;
1590         }
1591
1592         rc = cifs_do_rename(xid, source_dentry, fromName,
1593                             target_dentry, toName);
1594
1595         if (rc == -EEXIST && tcon->unix_ext) {
1596                 /*
1597                  * Are src and dst hardlinks of same inode? We can
1598                  * only tell with unix extensions enabled
1599                  */
1600                 info_buf_source =
1601                         kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO),
1602                                         GFP_KERNEL);
1603                 if (info_buf_source == NULL) {
1604                         rc = -ENOMEM;
1605                         goto cifs_rename_exit;
1606                 }
1607
1608                 info_buf_target = info_buf_source + 1;
1609                 tmprc = CIFSSMBUnixQPathInfo(xid, tcon, fromName,
1610                                         info_buf_source,
1611                                         cifs_sb->local_nls,
1612                                         cifs_sb->mnt_cifs_flags &
1613                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1614                 if (tmprc != 0)
1615                         goto unlink_target;
1616
1617                 tmprc = CIFSSMBUnixQPathInfo(xid, tcon, toName,
1618                                         info_buf_target,
1619                                         cifs_sb->local_nls,
1620                                         cifs_sb->mnt_cifs_flags &
1621                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1622
1623                 if (tmprc == 0 && (info_buf_source->UniqueId ==
1624                                    info_buf_target->UniqueId)) {
1625                         /* same file, POSIX says that this is a noop */
1626                         rc = 0;
1627                         goto cifs_rename_exit;
1628                 }
1629         } /* else ... BB we could add the same check for Windows by
1630                      checking the UniqueId via FILE_INTERNAL_INFO */
1631
1632 unlink_target:
1633         /* Try unlinking the target dentry if it's not negative */
1634         if (target_dentry->d_inode && (rc == -EACCES || rc == -EEXIST)) {
1635                 tmprc = cifs_unlink(target_dir, target_dentry);
1636                 if (tmprc)
1637                         goto cifs_rename_exit;
1638
1639                 rc = cifs_do_rename(xid, source_dentry, fromName,
1640                                     target_dentry, toName);
1641         }
1642
1643 cifs_rename_exit:
1644         kfree(info_buf_source);
1645         kfree(fromName);
1646         kfree(toName);
1647         FreeXid(xid);
1648         cifs_put_tlink(tlink);
1649         return rc;
1650 }
1651
1652 static bool
1653 cifs_inode_needs_reval(struct inode *inode)
1654 {
1655         struct cifsInodeInfo *cifs_i = CIFS_I(inode);
1656         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1657
1658         if (cifs_i->clientCanCacheRead)
1659                 return false;
1660
1661         if (!lookupCacheEnabled)
1662                 return true;
1663
1664         if (cifs_i->time == 0)
1665                 return true;
1666
1667         if (!time_in_range(jiffies, cifs_i->time,
1668                                 cifs_i->time + cifs_sb->actimeo))
1669                 return true;
1670
1671         /* hardlinked files w/ noserverino get "special" treatment */
1672         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) &&
1673             S_ISREG(inode->i_mode) && inode->i_nlink != 1)
1674                 return true;
1675
1676         return false;
1677 }
1678
1679 /*
1680  * Zap the cache. Called when invalid_mapping flag is set.
1681  */
1682 static void
1683 cifs_invalidate_mapping(struct inode *inode)
1684 {
1685         int rc;
1686         struct cifsInodeInfo *cifs_i = CIFS_I(inode);
1687
1688         cifs_i->invalid_mapping = false;
1689
1690         /* write back any cached data */
1691         if (inode->i_mapping && inode->i_mapping->nrpages != 0) {
1692                 rc = filemap_write_and_wait(inode->i_mapping);
1693                 mapping_set_error(inode->i_mapping, rc);
1694         }
1695         invalidate_remote_inode(inode);
1696         cifs_fscache_reset_inode_cookie(inode);
1697 }
1698
1699 int cifs_revalidate_file(struct file *filp)
1700 {
1701         int rc = 0;
1702         struct inode *inode = filp->f_path.dentry->d_inode;
1703         struct cifsFileInfo *cfile = (struct cifsFileInfo *) filp->private_data;
1704
1705         if (!cifs_inode_needs_reval(inode))
1706                 goto check_inval;
1707
1708         if (tlink_tcon(cfile->tlink)->unix_ext)
1709                 rc = cifs_get_file_info_unix(filp);
1710         else
1711                 rc = cifs_get_file_info(filp);
1712
1713 check_inval:
1714         if (CIFS_I(inode)->invalid_mapping)
1715                 cifs_invalidate_mapping(inode);
1716
1717         return rc;
1718 }
1719
1720 /* revalidate a dentry's inode attributes */
1721 int cifs_revalidate_dentry(struct dentry *dentry)
1722 {
1723         int xid;
1724         int rc = 0;
1725         char *full_path = NULL;
1726         struct inode *inode = dentry->d_inode;
1727         struct super_block *sb = dentry->d_sb;
1728
1729         if (inode == NULL)
1730                 return -ENOENT;
1731
1732         xid = GetXid();
1733
1734         if (!cifs_inode_needs_reval(inode))
1735                 goto check_inval;
1736
1737         /* can not safely grab the rename sem here if rename calls revalidate
1738            since that would deadlock */
1739         full_path = build_path_from_dentry(dentry);
1740         if (full_path == NULL) {
1741                 rc = -ENOMEM;
1742                 goto check_inval;
1743         }
1744
1745         cFYI(1, "Revalidate: %s inode 0x%p count %d dentry: 0x%p d_time %ld "
1746                  "jiffies %ld", full_path, inode, inode->i_count.counter,
1747                  dentry, dentry->d_time, jiffies);
1748
1749         if (cifs_sb_master_tcon(CIFS_SB(sb))->unix_ext)
1750                 rc = cifs_get_inode_info_unix(&inode, full_path, sb, xid);
1751         else
1752                 rc = cifs_get_inode_info(&inode, full_path, NULL, sb,
1753                                          xid, NULL);
1754
1755 check_inval:
1756         if (CIFS_I(inode)->invalid_mapping)
1757                 cifs_invalidate_mapping(inode);
1758
1759         kfree(full_path);
1760         FreeXid(xid);
1761         return rc;
1762 }
1763
1764 int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1765                  struct kstat *stat)
1766 {
1767         struct cifs_sb_info *cifs_sb = CIFS_SB(dentry->d_sb);
1768         struct cifsTconInfo *tcon = cifs_sb_master_tcon(cifs_sb);
1769         int err = cifs_revalidate_dentry(dentry);
1770
1771         if (!err) {
1772                 generic_fillattr(dentry->d_inode, stat);
1773                 stat->blksize = CIFS_MAX_MSGSIZE;
1774                 stat->ino = CIFS_I(dentry->d_inode)->uniqueid;
1775
1776                 /*
1777                  * If on a multiuser mount without unix extensions, and the
1778                  * admin hasn't overridden them, set the ownership to the
1779                  * fsuid/fsgid of the current process.
1780                  */
1781                 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER) &&
1782                     !tcon->unix_ext) {
1783                         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID))
1784                                 stat->uid = current_fsuid();
1785                         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID))
1786                                 stat->gid = current_fsgid();
1787                 }
1788         }
1789         return err;
1790 }
1791
1792 static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1793 {
1794         pgoff_t index = from >> PAGE_CACHE_SHIFT;
1795         unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1796         struct page *page;
1797         int rc = 0;
1798
1799         page = grab_cache_page(mapping, index);
1800         if (!page)
1801                 return -ENOMEM;
1802
1803         zero_user_segment(page, offset, PAGE_CACHE_SIZE);
1804         unlock_page(page);
1805         page_cache_release(page);
1806         return rc;
1807 }
1808
1809 static void cifs_setsize(struct inode *inode, loff_t offset)
1810 {
1811         loff_t oldsize;
1812
1813         spin_lock(&inode->i_lock);
1814         oldsize = inode->i_size;
1815         i_size_write(inode, offset);
1816         spin_unlock(&inode->i_lock);
1817
1818         truncate_pagecache(inode, oldsize, offset);
1819 }
1820
1821 static int
1822 cifs_set_file_size(struct inode *inode, struct iattr *attrs,
1823                    int xid, char *full_path)
1824 {
1825         int rc;
1826         struct cifsFileInfo *open_file;
1827         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1828         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1829         struct tcon_link *tlink = NULL;
1830         struct cifsTconInfo *pTcon = NULL;
1831
1832         /*
1833          * To avoid spurious oplock breaks from server, in the case of
1834          * inodes that we already have open, avoid doing path based
1835          * setting of file size if we can do it by handle.
1836          * This keeps our caching token (oplock) and avoids timeouts
1837          * when the local oplock break takes longer to flush
1838          * writebehind data than the SMB timeout for the SetPathInfo
1839          * request would allow
1840          */
1841         open_file = find_writable_file(cifsInode, true);
1842         if (open_file) {
1843                 __u16 nfid = open_file->netfid;
1844                 __u32 npid = open_file->pid;
1845                 pTcon = tlink_tcon(open_file->tlink);
1846                 rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size, nfid,
1847                                         npid, false);
1848                 cifsFileInfo_put(open_file);
1849                 cFYI(1, "SetFSize for attrs rc = %d", rc);
1850                 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1851                         unsigned int bytes_written;
1852                         rc = CIFSSMBWrite(xid, pTcon, nfid, 0, attrs->ia_size,
1853                                           &bytes_written, NULL, NULL, 1);
1854                         cFYI(1, "Wrt seteof rc %d", rc);
1855                 }
1856         } else
1857                 rc = -EINVAL;
1858
1859         if (rc != 0) {
1860                 if (pTcon == NULL) {
1861                         tlink = cifs_sb_tlink(cifs_sb);
1862                         if (IS_ERR(tlink))
1863                                 return PTR_ERR(tlink);
1864                         pTcon = tlink_tcon(tlink);
1865                 }
1866
1867                 /* Set file size by pathname rather than by handle
1868                    either because no valid, writeable file handle for
1869                    it was found or because there was an error setting
1870                    it by handle */
1871                 rc = CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size,
1872                                    false, cifs_sb->local_nls,
1873                                    cifs_sb->mnt_cifs_flags &
1874                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1875                 cFYI(1, "SetEOF by path (setattrs) rc = %d", rc);
1876                 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1877                         __u16 netfid;
1878                         int oplock = 0;
1879
1880                         rc = SMBLegacyOpen(xid, pTcon, full_path,
1881                                 FILE_OPEN, GENERIC_WRITE,
1882                                 CREATE_NOT_DIR, &netfid, &oplock, NULL,
1883                                 cifs_sb->local_nls,
1884                                 cifs_sb->mnt_cifs_flags &
1885                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1886                         if (rc == 0) {
1887                                 unsigned int bytes_written;
1888                                 rc = CIFSSMBWrite(xid, pTcon, netfid, 0,
1889                                                   attrs->ia_size,
1890                                                   &bytes_written, NULL,
1891                                                   NULL, 1);
1892                                 cFYI(1, "wrt seteof rc %d", rc);
1893                                 CIFSSMBClose(xid, pTcon, netfid);
1894                         }
1895                 }
1896                 if (tlink)
1897                         cifs_put_tlink(tlink);
1898         }
1899
1900         if (rc == 0) {
1901                 cifsInode->server_eof = attrs->ia_size;
1902                 cifs_setsize(inode, attrs->ia_size);
1903                 cifs_truncate_page(inode->i_mapping, inode->i_size);
1904         }
1905
1906         return rc;
1907 }
1908
1909 static int
1910 cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
1911 {
1912         int rc;
1913         int xid;
1914         char *full_path = NULL;
1915         struct inode *inode = direntry->d_inode;
1916         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1917         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1918         struct tcon_link *tlink;
1919         struct cifsTconInfo *pTcon;
1920         struct cifs_unix_set_info_args *args = NULL;
1921         struct cifsFileInfo *open_file;
1922
1923         cFYI(1, "setattr_unix on file %s attrs->ia_valid=0x%x",
1924                  direntry->d_name.name, attrs->ia_valid);
1925
1926         xid = GetXid();
1927
1928         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
1929                 attrs->ia_valid |= ATTR_FORCE;
1930
1931         rc = inode_change_ok(inode, attrs);
1932         if (rc < 0)
1933                 goto out;
1934
1935         full_path = build_path_from_dentry(direntry);
1936         if (full_path == NULL) {
1937                 rc = -ENOMEM;
1938                 goto out;
1939         }
1940
1941         /*
1942          * Attempt to flush data before changing attributes. We need to do
1943          * this for ATTR_SIZE and ATTR_MTIME for sure, and if we change the
1944          * ownership or mode then we may also need to do this. Here, we take
1945          * the safe way out and just do the flush on all setattr requests. If
1946          * the flush returns error, store it to report later and continue.
1947          *
1948          * BB: This should be smarter. Why bother flushing pages that
1949          * will be truncated anyway? Also, should we error out here if
1950          * the flush returns error?
1951          */
1952         rc = filemap_write_and_wait(inode->i_mapping);
1953         mapping_set_error(inode->i_mapping, rc);
1954         rc = 0;
1955
1956         if (attrs->ia_valid & ATTR_SIZE) {
1957                 rc = cifs_set_file_size(inode, attrs, xid, full_path);
1958                 if (rc != 0)
1959                         goto out;
1960         }
1961
1962         /* skip mode change if it's just for clearing setuid/setgid */
1963         if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
1964                 attrs->ia_valid &= ~ATTR_MODE;
1965
1966         args = kmalloc(sizeof(*args), GFP_KERNEL);
1967         if (args == NULL) {
1968                 rc = -ENOMEM;
1969                 goto out;
1970         }
1971
1972         /* set up the struct */
1973         if (attrs->ia_valid & ATTR_MODE)
1974                 args->mode = attrs->ia_mode;
1975         else
1976                 args->mode = NO_CHANGE_64;
1977
1978         if (attrs->ia_valid & ATTR_UID)
1979                 args->uid = attrs->ia_uid;
1980         else
1981                 args->uid = NO_CHANGE_64;
1982
1983         if (attrs->ia_valid & ATTR_GID)
1984                 args->gid = attrs->ia_gid;
1985         else
1986                 args->gid = NO_CHANGE_64;
1987
1988         if (attrs->ia_valid & ATTR_ATIME)
1989                 args->atime = cifs_UnixTimeToNT(attrs->ia_atime);
1990         else
1991                 args->atime = NO_CHANGE_64;
1992
1993         if (attrs->ia_valid & ATTR_MTIME)
1994                 args->mtime = cifs_UnixTimeToNT(attrs->ia_mtime);
1995         else
1996                 args->mtime = NO_CHANGE_64;
1997
1998         if (attrs->ia_valid & ATTR_CTIME)
1999                 args->ctime = cifs_UnixTimeToNT(attrs->ia_ctime);
2000         else
2001                 args->ctime = NO_CHANGE_64;
2002
2003         args->device = 0;
2004         open_file = find_writable_file(cifsInode, true);
2005         if (open_file) {
2006                 u16 nfid = open_file->netfid;
2007                 u32 npid = open_file->pid;
2008                 pTcon = tlink_tcon(open_file->tlink);
2009                 rc = CIFSSMBUnixSetFileInfo(xid, pTcon, args, nfid, npid);
2010                 cifsFileInfo_put(open_file);
2011         } else {
2012                 tlink = cifs_sb_tlink(cifs_sb);
2013                 if (IS_ERR(tlink)) {
2014                         rc = PTR_ERR(tlink);
2015                         goto out;
2016                 }
2017                 pTcon = tlink_tcon(tlink);
2018                 rc = CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, args,
2019                                     cifs_sb->local_nls,
2020                                     cifs_sb->mnt_cifs_flags &
2021                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
2022                 cifs_put_tlink(tlink);
2023         }
2024
2025         if (rc)
2026                 goto out;
2027
2028         if ((attrs->ia_valid & ATTR_SIZE) &&
2029             attrs->ia_size != i_size_read(inode))
2030                 truncate_setsize(inode, attrs->ia_size);
2031
2032         setattr_copy(inode, attrs);
2033         mark_inode_dirty(inode);
2034
2035         /* force revalidate when any of these times are set since some
2036            of the fs types (eg ext3, fat) do not have fine enough
2037            time granularity to match protocol, and we do not have a
2038            a way (yet) to query the server fs's time granularity (and
2039            whether it rounds times down).
2040         */
2041         if (attrs->ia_valid & (ATTR_MTIME | ATTR_CTIME))
2042                 cifsInode->time = 0;
2043 out:
2044         kfree(args);
2045         kfree(full_path);
2046         FreeXid(xid);
2047         return rc;
2048 }
2049
2050 static int
2051 cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
2052 {
2053         int xid;
2054         struct inode *inode = direntry->d_inode;
2055         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2056         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
2057         char *full_path = NULL;
2058         int rc = -EACCES;
2059         __u32 dosattr = 0;
2060         __u64 mode = NO_CHANGE_64;
2061
2062         xid = GetXid();
2063
2064         cFYI(1, "setattr on file %s attrs->iavalid 0x%x",
2065                  direntry->d_name.name, attrs->ia_valid);
2066
2067         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
2068                 attrs->ia_valid |= ATTR_FORCE;
2069
2070         rc = inode_change_ok(inode, attrs);
2071         if (rc < 0) {
2072                 FreeXid(xid);
2073                 return rc;
2074         }
2075
2076         full_path = build_path_from_dentry(direntry);
2077         if (full_path == NULL) {
2078                 rc = -ENOMEM;
2079                 FreeXid(xid);
2080                 return rc;
2081         }
2082
2083         /*
2084          * Attempt to flush data before changing attributes. We need to do
2085          * this for ATTR_SIZE and ATTR_MTIME for sure, and if we change the
2086          * ownership or mode then we may also need to do this. Here, we take
2087          * the safe way out and just do the flush on all setattr requests. If
2088          * the flush returns error, store it to report later and continue.
2089          *
2090          * BB: This should be smarter. Why bother flushing pages that
2091          * will be truncated anyway? Also, should we error out here if
2092          * the flush returns error?
2093          */
2094         rc = filemap_write_and_wait(inode->i_mapping);
2095         mapping_set_error(inode->i_mapping, rc);
2096         rc = 0;
2097
2098         if (attrs->ia_valid & ATTR_SIZE) {
2099                 rc = cifs_set_file_size(inode, attrs, xid, full_path);
2100                 if (rc != 0)
2101                         goto cifs_setattr_exit;
2102         }
2103
2104         /*
2105          * Without unix extensions we can't send ownership changes to the
2106          * server, so silently ignore them. This is consistent with how
2107          * local DOS/Windows filesystems behave (VFAT, NTFS, etc). With
2108          * CIFSACL support + proper Windows to Unix idmapping, we may be
2109          * able to support this in the future.
2110          */
2111         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID))
2112                 attrs->ia_valid &= ~(ATTR_UID | ATTR_GID);
2113
2114         /* skip mode change if it's just for clearing setuid/setgid */
2115         if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
2116                 attrs->ia_valid &= ~ATTR_MODE;
2117
2118         if (attrs->ia_valid & ATTR_MODE) {
2119                 cFYI(1, "Mode changed to 0%o", attrs->ia_mode);
2120                 mode = attrs->ia_mode;
2121         }
2122
2123         if (attrs->ia_valid & ATTR_MODE) {
2124                 rc = 0;
2125 #ifdef CONFIG_CIFS_ACL
2126                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
2127                         rc = mode_to_cifs_acl(inode, full_path, mode);
2128                         if (rc) {
2129                                 cFYI(1, "%s: Setting ACL failed with error: %d",
2130                                         __func__, rc);
2131                                 goto cifs_setattr_exit;
2132                         }
2133                 } else
2134 #endif /* CONFIG_CIFS_ACL */
2135                 if (((mode & S_IWUGO) == 0) &&
2136                     (cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
2137
2138                         dosattr = cifsInode->cifsAttrs | ATTR_READONLY;
2139
2140                         /* fix up mode if we're not using dynperm */
2141                         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
2142                                 attrs->ia_mode = inode->i_mode & ~S_IWUGO;
2143                 } else if ((mode & S_IWUGO) &&
2144                            (cifsInode->cifsAttrs & ATTR_READONLY)) {
2145
2146                         dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
2147                         /* Attributes of 0 are ignored */
2148                         if (dosattr == 0)
2149                                 dosattr |= ATTR_NORMAL;
2150
2151                         /* reset local inode permissions to normal */
2152                         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
2153                                 attrs->ia_mode &= ~(S_IALLUGO);
2154                                 if (S_ISDIR(inode->i_mode))
2155                                         attrs->ia_mode |=
2156                                                 cifs_sb->mnt_dir_mode;
2157                                 else
2158                                         attrs->ia_mode |=
2159                                                 cifs_sb->mnt_file_mode;
2160                         }
2161                 } else if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
2162                         /* ignore mode change - ATTR_READONLY hasn't changed */
2163                         attrs->ia_valid &= ~ATTR_MODE;
2164                 }
2165         }
2166
2167         if (attrs->ia_valid & (ATTR_MTIME|ATTR_ATIME|ATTR_CTIME) ||
2168             ((attrs->ia_valid & ATTR_MODE) && dosattr)) {
2169                 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
2170                 /* BB: check for rc = -EOPNOTSUPP and switch to legacy mode */
2171
2172                 /* Even if error on time set, no sense failing the call if
2173                 the server would set the time to a reasonable value anyway,
2174                 and this check ensures that we are not being called from
2175                 sys_utimes in which case we ought to fail the call back to
2176                 the user when the server rejects the call */
2177                 if ((rc) && (attrs->ia_valid &
2178                                 (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
2179                         rc = 0;
2180         }
2181
2182         /* do not need local check to inode_check_ok since the server does
2183            that */
2184         if (rc)
2185                 goto cifs_setattr_exit;
2186
2187         if ((attrs->ia_valid & ATTR_SIZE) &&
2188             attrs->ia_size != i_size_read(inode))
2189                 truncate_setsize(inode, attrs->ia_size);
2190
2191         setattr_copy(inode, attrs);
2192         mark_inode_dirty(inode);
2193
2194 cifs_setattr_exit:
2195         kfree(full_path);
2196         FreeXid(xid);
2197         return rc;
2198 }
2199
2200 int
2201 cifs_setattr(struct dentry *direntry, struct iattr *attrs)
2202 {
2203         struct inode *inode = direntry->d_inode;
2204         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2205         struct cifsTconInfo *pTcon = cifs_sb_master_tcon(cifs_sb);
2206
2207         if (pTcon->unix_ext)
2208                 return cifs_setattr_unix(direntry, attrs);
2209
2210         return cifs_setattr_nounix(direntry, attrs);
2211
2212         /* BB: add cifs_setattr_legacy for really old servers */
2213 }
2214
2215 #if 0
2216 void cifs_delete_inode(struct inode *inode)
2217 {
2218         cFYI(1, "In cifs_delete_inode, inode = 0x%p", inode);
2219         /* may have to add back in if and when safe distributed caching of
2220            directories added e.g. via FindNotify */
2221 }
2222 #endif