fs/9p/vfs_inode_dotl.c

   1 /*
   2  *  linux/fs/9p/vfs_inode_dotl.c
   3  *
   4  * This file contains vfs inode ops for the 9P2000.L protocol.
   5  *
   6  *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
   7  *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License version 2
  11  *  as published by the Free Software Foundation.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to:
  20  *  Free Software Foundation
  21  *  51 Franklin Street, Fifth Floor
  22  *  Boston, MA  02111-1301  USA
  23  *
  24  */
  25
  26 #include <linux/module.h>
  27 #include <linux/errno.h>
  28 #include <linux/fs.h>
  29 #include <linux/file.h>
  30 #include <linux/pagemap.h>
  31 #include <linux/stat.h>
  32 #include <linux/string.h>
  33 #include <linux/inet.h>
  34 #include <linux/namei.h>
  35 #include <linux/idr.h>
  36 #include <linux/sched.h>
  37 #include <linux/slab.h>
  38 #include <linux/xattr.h>
  39 #include <linux/posix_acl.h>
  40 #include <net/9p/9p.h>
  41 #include <net/9p/client.h>
  42
  43 #include "v9fs.h"
  44 #include "v9fs_vfs.h"
  45 #include "fid.h"
  46 #include "cache.h"
  47 #include "xattr.h"
  48 #include "acl.h"
  49
  50 static int
  51 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
  52                     dev_t rdev);
  53
  54 /**
  55  * v9fs_get_fsgid_for_create - Helper function to get the gid for creating a
  56  * new file system object. This checks the S_ISGID to determine the owning
  57  * group of the new file system object.
  58  */
  59
  60 static gid_t v9fs_get_fsgid_for_create(struct inode *dir_inode)
  61 {
  62         BUG_ON(dir_inode == NULL);
  63
  64         if (dir_inode->i_mode & S_ISGID) {
  65                 /* set_gid bit is set.*/
  66                 return dir_inode->i_gid;
  67         }
  68         return current_fsgid();
  69 }
  70
  71 static int v9fs_test_inode_dotl(struct inode *inode, void *data)
  72 {
  73         struct v9fs_inode *v9inode = V9FS_I(inode);
  74         struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
  75
  76         /* don't match inode of different type */
  77         if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
  78                 return 0;
  79
  80         if (inode->i_generation != st->st_gen)
  81                 return 0;
  82
  83         /* compare qid details */
  84         if (memcmp(&v9inode->qid.version,
  85                    &st->qid.version, sizeof(v9inode->qid.version)))
  86                 return 0;
  87
  88         if (v9inode->qid.type != st->qid.type)
  89                 return 0;
  90         return 1;
  91 }
  92
  93 /* Always get a new inode */
  94 static int v9fs_test_new_inode_dotl(struct inode *inode, void *data)
  95 {
  96         return 0;
  97 }
  98
  99 static int v9fs_set_inode_dotl(struct inode *inode,  void *data)
 100 {
 101         struct v9fs_inode *v9inode = V9FS_I(inode);
 102         struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
 103
 104         memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
 105         inode->i_generation = st->st_gen;
 106         return 0;
 107 }
 108
 109 static struct inode *v9fs_qid_iget_dotl(struct super_block *sb,
 110                                         struct p9_qid *qid,
 111                                         struct p9_fid *fid,
 112                                         struct p9_stat_dotl *st,
 113                                         int new)
 114 {
 115         int retval;
 116         unsigned long i_ino;
 117         struct inode *inode;
 118         struct v9fs_session_info *v9ses = sb->s_fs_info;
 119         int (*test)(struct inode *, void *);
 120
 121         if (new)
 122                 test = v9fs_test_new_inode_dotl;
 123         else
 124                 test = v9fs_test_inode_dotl;
 125
 126         i_ino = v9fs_qid2ino(qid);
 127         inode = iget5_locked(sb, i_ino, test, v9fs_set_inode_dotl, st);
 128         if (!inode)
 129                 return ERR_PTR(-ENOMEM);
 130         if (!(inode->i_state & I_NEW))
 131                 return inode;
 132         /*
 133          * initialize the inode with the stat info
 134          * FIXME!! we may need support for stale inodes
 135          * later.
 136          */
 137         inode->i_ino = i_ino;
 138         retval = v9fs_init_inode(v9ses, inode,
 139                                  st->st_mode, new_decode_dev(st->st_rdev));
 140         if (retval)
 141                 goto error;
 142
 143         v9fs_stat2inode_dotl(st, inode);
 144 #ifdef CONFIG_9P_FSCACHE
 145         v9fs_cache_inode_get_cookie(inode);
 146 #endif
 147         retval = v9fs_get_acl(inode, fid);
 148         if (retval)
 149                 goto error;
 150
 151         unlock_new_inode(inode);
 152         return inode;
 153 error:
 154         unlock_new_inode(inode);
 155         iput(inode);
 156         return ERR_PTR(retval);
 157
 158 }
 159
 160 struct inode *
 161 v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
 162                          struct super_block *sb, int new)
 163 {
 164         struct p9_stat_dotl *st;
 165         struct inode *inode = NULL;
 166
 167         st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN);
 168         if (IS_ERR(st))
 169                 return ERR_CAST(st);
 170
 171         inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new);
 172         kfree(st);
 173         return inode;
 174 }
 175
 176 struct dotl_openflag_map {
 177         int open_flag;
 178         int dotl_flag;
 179 };
 180
 181 static int v9fs_mapped_dotl_flags(int flags)
 182 {
 183         int i;
 184         int rflags = 0;
 185         struct dotl_openflag_map dotl_oflag_map[] = {
 186                 { O_CREAT,      P9_DOTL_CREATE },
 187                 { O_EXCL,       P9_DOTL_EXCL },
 188                 { O_NOCTTY,     P9_DOTL_NOCTTY },
 189                 { O_TRUNC,      P9_DOTL_TRUNC },
 190                 { O_APPEND,     P9_DOTL_APPEND },
 191                 { O_NONBLOCK,   P9_DOTL_NONBLOCK },
 192                 { O_DSYNC,      P9_DOTL_DSYNC },
 193                 { FASYNC,       P9_DOTL_FASYNC },
 194                 { O_DIRECT,     P9_DOTL_DIRECT },
 195                 { O_LARGEFILE,  P9_DOTL_LARGEFILE },
 196                 { O_DIRECTORY,  P9_DOTL_DIRECTORY },
 197                 { O_NOFOLLOW,   P9_DOTL_NOFOLLOW },
 198                 { O_NOATIME,    P9_DOTL_NOATIME },
 199                 { O_CLOEXEC,    P9_DOTL_CLOEXEC },
 200                 { O_SYNC,       P9_DOTL_SYNC},
 201         };
 202         for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) {
 203                 if (flags & dotl_oflag_map[i].open_flag)
 204                         rflags |= dotl_oflag_map[i].dotl_flag;
 205         }
 206         return rflags;
 207 }
 208
 209 /**
 210  * v9fs_open_to_dotl_flags- convert Linux specific open flags to
 211  * plan 9 open flag.
 212  * @flags: flags to convert
 213  */
 214 int v9fs_open_to_dotl_flags(int flags)
 215 {
 216         int rflags = 0;
 217
 218         /*
 219          * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
 220          * and P9_DOTL_NOACCESS
 221          */
 222         rflags |= flags & O_ACCMODE;
 223         rflags |= v9fs_mapped_dotl_flags(flags);
 224
 225         return rflags;
 226 }
 227
 228 /**
 229  * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
 230  * @dir: directory inode that is being created
 231  * @dentry:  dentry that is being deleted
 232  * @mode: create permissions
 233  *
 234  */
 235
 236 static int
 237 v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
 238                 bool excl)
 239 {
 240         return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
 241 }
 242
 243 static int
 244 v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
 245                           struct file *file, unsigned flags, umode_t omode,
 246                           int *opened)
 247 {
 248         int err = 0;
 249         gid_t gid;
 250         umode_t mode;
 251         char *name = NULL;
 252         struct p9_qid qid;
 253         struct inode *inode;
 254         struct p9_fid *fid = NULL;
 255         struct v9fs_inode *v9inode;
 256         struct p9_fid *dfid, *ofid, *inode_fid;
 257         struct v9fs_session_info *v9ses;
 258         struct posix_acl *pacl = NULL, *dacl = NULL;
 259         struct dentry *res = NULL;
 260
 261         if (d_unhashed(dentry)) {
 262                 res = v9fs_vfs_lookup(dir, dentry, 0);
 263                 if (IS_ERR(res))
 264                         return PTR_ERR(res);
 265
 266                 if (res)
 267                         dentry = res;
 268         }
 269
 270         /* Only creates */
 271         if (!(flags & O_CREAT) || dentry->d_inode)
 272                 return finish_no_open(file, res);
 273
 274         v9ses = v9fs_inode2v9ses(dir);
 275
 276         name = (char *) dentry->d_name.name;
 277         p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%hx\n",
 278                  name, flags, omode);
 279
 280         dfid = v9fs_fid_lookup(dentry->d_parent);
 281         if (IS_ERR(dfid)) {
 282                 err = PTR_ERR(dfid);
 283                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 284                 goto out;
 285         }
 286
 287         /* clone a fid to use for creation */
 288         ofid = p9_client_walk(dfid, 0, NULL, 1);
 289         if (IS_ERR(ofid)) {
 290                 err = PTR_ERR(ofid);
 291                 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
 292                 goto out;
 293         }
 294
 295         gid = v9fs_get_fsgid_for_create(dir);
 296
 297         mode = omode;
 298         /* Update mode based on ACL value */
 299         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 300         if (err) {
 301                 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in creat %d\n",
 302                          err);
 303                 goto error;
 304         }
 305         err = p9_client_create_dotl(ofid, name, v9fs_open_to_dotl_flags(flags),
 306                                     mode, gid, &qid);
 307         if (err < 0) {
 308                 p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in creat %d\n",
 309                          err);
 310                 goto error;
 311         }
 312         v9fs_invalidate_inode_attr(dir);
 313
 314         /* instantiate inode and assign the unopened fid to the dentry */
 315         fid = p9_client_walk(dfid, 1, &name, 1);
 316         if (IS_ERR(fid)) {
 317                 err = PTR_ERR(fid);
 318                 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
 319                 fid = NULL;
 320                 goto error;
 321         }
 322         inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 323         if (IS_ERR(inode)) {
 324                 err = PTR_ERR(inode);
 325                 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err);
 326                 goto error;
 327         }
 328         err = v9fs_fid_add(dentry, fid);
 329         if (err < 0)
 330                 goto error;
 331         d_instantiate(dentry, inode);
 332
 333         /* Now set the ACL based on the default value */
 334         v9fs_set_create_acl(dentry, &dacl, &pacl);
 335
 336         v9inode = V9FS_I(inode);
 337         mutex_lock(&v9inode->v_mutex);
 338         if (v9ses->cache && !v9inode->writeback_fid &&
 339             ((flags & O_ACCMODE) != O_RDONLY)) {
 340                 /*
 341                  * clone a fid and add it to writeback_fid
 342                  * we do it during open time instead of
 343                  * page dirty time via write_begin/page_mkwrite
 344                  * because we want write after unlink usecase
 345                  * to work.
 346                  */
 347                 inode_fid = v9fs_writeback_fid(dentry);
 348                 if (IS_ERR(inode_fid)) {
 349                         err = PTR_ERR(inode_fid);
 350                         mutex_unlock(&v9inode->v_mutex);
 351                         goto err_clunk_old_fid;
 352                 }
 353                 v9inode->writeback_fid = (void *) inode_fid;
 354         }
 355         mutex_unlock(&v9inode->v_mutex);
 356         /* Since we are opening a file, assign the open fid to the file */
 357         err = finish_open(file, dentry, generic_file_open, opened);
 358         if (err)
 359                 goto err_clunk_old_fid;
 360         file->private_data = ofid;
 361 #ifdef CONFIG_9P_FSCACHE
 362         if (v9ses->cache)
 363                 v9fs_cache_inode_set_cookie(inode, file);
 364 #endif
 365         *opened |= FILE_CREATED;
 366 out:
 367         dput(res);
 368         return err;
 369
 370 error:
 371         if (fid)
 372                 p9_client_clunk(fid);
 373 err_clunk_old_fid:
 374         if (ofid)
 375                 p9_client_clunk(ofid);
 376         v9fs_set_create_acl(NULL, &dacl, &pacl);
 377         goto out;
 378 }
 379
 380 /**
 381  * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
 382  * @dir:  inode that is being unlinked
 383  * @dentry: dentry that is being unlinked
 384  * @mode: mode for new directory
 385  *
 386  */
 387
 388 static int v9fs_vfs_mkdir_dotl(struct inode *dir,
 389                                struct dentry *dentry, umode_t omode)
 390 {
 391         int err;
 392         struct v9fs_session_info *v9ses;
 393         struct p9_fid *fid = NULL, *dfid = NULL;
 394         gid_t gid;
 395         char *name;
 396         umode_t mode;
 397         struct inode *inode;
 398         struct p9_qid qid;
 399         struct dentry *dir_dentry;
 400         struct posix_acl *dacl = NULL, *pacl = NULL;
 401
 402         p9_debug(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
 403         err = 0;
 404         v9ses = v9fs_inode2v9ses(dir);
 405
 406         omode |= S_IFDIR;
 407         if (dir->i_mode & S_ISGID)
 408                 omode |= S_ISGID;
 409
 410         dir_dentry = dentry->d_parent;
 411         dfid = v9fs_fid_lookup(dir_dentry);
 412         if (IS_ERR(dfid)) {
 413                 err = PTR_ERR(dfid);
 414                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 415                 dfid = NULL;
 416                 goto error;
 417         }
 418
 419         gid = v9fs_get_fsgid_for_create(dir);
 420         mode = omode;
 421         /* Update mode based on ACL value */
 422         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 423         if (err) {
 424                 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n",
 425                          err);
 426                 goto error;
 427         }
 428         name = (char *) dentry->d_name.name;
 429         err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
 430         if (err < 0)
 431                 goto error;
 432
 433         /* instantiate inode and assign the unopened fid to the dentry */
 434         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 435                 fid = p9_client_walk(dfid, 1, &name, 1);
 436                 if (IS_ERR(fid)) {
 437                         err = PTR_ERR(fid);
 438                         p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 439                                  err);
 440                         fid = NULL;
 441                         goto error;
 442                 }
 443
 444                 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 445                 if (IS_ERR(inode)) {
 446                         err = PTR_ERR(inode);
 447                         p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
 448                                  err);
 449                         goto error;
 450                 }
 451                 err = v9fs_fid_add(dentry, fid);
 452                 if (err < 0)
 453                         goto error;
 454                 d_instantiate(dentry, inode);
 455                 fid = NULL;
 456         } else {
 457                 /*
 458                  * Not in cached mode. No need to populate
 459                  * inode with stat. We need to get an inode
 460                  * so that we can set the acl with dentry
 461                  */
 462                 inode = v9fs_get_inode(dir->i_sb, mode, 0);
 463                 if (IS_ERR(inode)) {
 464                         err = PTR_ERR(inode);
 465                         goto error;
 466                 }
 467                 d_instantiate(dentry, inode);
 468         }
 469         /* Now set the ACL based on the default value */
 470         v9fs_set_create_acl(dentry, &dacl, &pacl);
 471         inc_nlink(dir);
 472         v9fs_invalidate_inode_attr(dir);
 473 error:
 474         if (fid)
 475                 p9_client_clunk(fid);
 476         v9fs_set_create_acl(NULL, &dacl, &pacl);
 477         return err;
 478 }
 479
 480 static int
 481 v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry,
 482                  struct kstat *stat)
 483 {
 484         int err;
 485         struct v9fs_session_info *v9ses;
 486         struct p9_fid *fid;
 487         struct p9_stat_dotl *st;
 488
 489         p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
 490         err = -EPERM;
 491         v9ses = v9fs_dentry2v9ses(dentry);
 492         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 493                 generic_fillattr(dentry->d_inode, stat);
 494                 return 0;
 495         }
 496         fid = v9fs_fid_lookup(dentry);
 497         if (IS_ERR(fid))
 498                 return PTR_ERR(fid);
 499
 500         /* Ask for all the fields in stat structure. Server will return
 501          * whatever it supports
 502          */
 503
 504         st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
 505         if (IS_ERR(st))
 506                 return PTR_ERR(st);
 507
 508         v9fs_stat2inode_dotl(st, dentry->d_inode);
 509         generic_fillattr(dentry->d_inode, stat);
 510         /* Change block size to what the server returned */
 511         stat->blksize = st->st_blksize;
 512
 513         kfree(st);
 514         return 0;
 515 }
 516
 517 /*
 518  * Attribute flags.
 519  */
 520 #define P9_ATTR_MODE            (1 << 0)
 521 #define P9_ATTR_UID             (1 << 1)
 522 #define P9_ATTR_GID             (1 << 2)
 523 #define P9_ATTR_SIZE            (1 << 3)
 524 #define P9_ATTR_ATIME           (1 << 4)
 525 #define P9_ATTR_MTIME           (1 << 5)
 526 #define P9_ATTR_CTIME           (1 << 6)
 527 #define P9_ATTR_ATIME_SET       (1 << 7)
 528 #define P9_ATTR_MTIME_SET       (1 << 8)
 529
 530 struct dotl_iattr_map {
 531         int iattr_valid;
 532         int p9_iattr_valid;
 533 };
 534
 535 static int v9fs_mapped_iattr_valid(int iattr_valid)
 536 {
 537         int i;
 538         int p9_iattr_valid = 0;
 539         struct dotl_iattr_map dotl_iattr_map[] = {
 540                 { ATTR_MODE,            P9_ATTR_MODE },
 541                 { ATTR_UID,             P9_ATTR_UID },
 542                 { ATTR_GID,             P9_ATTR_GID },
 543                 { ATTR_SIZE,            P9_ATTR_SIZE },
 544                 { ATTR_ATIME,           P9_ATTR_ATIME },
 545                 { ATTR_MTIME,           P9_ATTR_MTIME },
 546                 { ATTR_CTIME,           P9_ATTR_CTIME },
 547                 { ATTR_ATIME_SET,       P9_ATTR_ATIME_SET },
 548                 { ATTR_MTIME_SET,       P9_ATTR_MTIME_SET },
 549         };
 550         for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) {
 551                 if (iattr_valid & dotl_iattr_map[i].iattr_valid)
 552                         p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid;
 553         }
 554         return p9_iattr_valid;
 555 }
 556
 557 /**
 558  * v9fs_vfs_setattr_dotl - set file metadata
 559  * @dentry: file whose metadata to set
 560  * @iattr: metadata assignment structure
 561  *
 562  */
 563
 564 int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
 565 {
 566         int retval;
 567         struct v9fs_session_info *v9ses;
 568         struct p9_fid *fid;
 569         struct p9_iattr_dotl p9attr;
 570
 571         p9_debug(P9_DEBUG_VFS, "\n");
 572
 573         retval = inode_change_ok(dentry->d_inode, iattr);
 574         if (retval)
 575                 return retval;
 576
 577         p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid);
 578         p9attr.mode = iattr->ia_mode;
 579         p9attr.uid = iattr->ia_uid;
 580         p9attr.gid = iattr->ia_gid;
 581         p9attr.size = iattr->ia_size;
 582         p9attr.atime_sec = iattr->ia_atime.tv_sec;
 583         p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
 584         p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
 585         p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
 586
 587         retval = -EPERM;
 588         v9ses = v9fs_dentry2v9ses(dentry);
 589         fid = v9fs_fid_lookup(dentry);
 590         if (IS_ERR(fid))
 591                 return PTR_ERR(fid);
 592
 593         /* Write all dirty data */
 594         if (S_ISREG(dentry->d_inode->i_mode))
 595                 filemap_write_and_wait(dentry->d_inode->i_mapping);
 596
 597         retval = p9_client_setattr(fid, &p9attr);
 598         if (retval < 0)
 599                 return retval;
 600
 601         if ((iattr->ia_valid & ATTR_SIZE) &&
 602             iattr->ia_size != i_size_read(dentry->d_inode))
 603                 truncate_setsize(dentry->d_inode, iattr->ia_size);
 604
 605         v9fs_invalidate_inode_attr(dentry->d_inode);
 606         setattr_copy(dentry->d_inode, iattr);
 607         mark_inode_dirty(dentry->d_inode);
 608         if (iattr->ia_valid & ATTR_MODE) {
 609                 /* We also want to update ACL when we update mode bits */
 610                 retval = v9fs_acl_chmod(dentry);
 611                 if (retval < 0)
 612                         return retval;
 613         }
 614         return 0;
 615 }
 616
 617 /**
 618  * v9fs_stat2inode_dotl - populate an inode structure with stat info
 619  * @stat: stat structure
 620  * @inode: inode to populate
 621  * @sb: superblock of filesystem
 622  *
 623  */
 624
 625 void
 626 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode)
 627 {
 628         umode_t mode;
 629         struct v9fs_inode *v9inode = V9FS_I(inode);
 630
 631         if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
 632                 inode->i_atime.tv_sec = stat->st_atime_sec;
 633                 inode->i_atime.tv_nsec = stat->st_atime_nsec;
 634                 inode->i_mtime.tv_sec = stat->st_mtime_sec;
 635                 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
 636                 inode->i_ctime.tv_sec = stat->st_ctime_sec;
 637                 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
 638                 inode->i_uid = stat->st_uid;
 639                 inode->i_gid = stat->st_gid;
 640                 set_nlink(inode, stat->st_nlink);
 641
 642                 mode = stat->st_mode & S_IALLUGO;
 643                 mode |= inode->i_mode & ~S_IALLUGO;
 644                 inode->i_mode = mode;
 645
 646                 i_size_write(inode, stat->st_size);
 647                 inode->i_blocks = stat->st_blocks;
 648         } else {
 649                 if (stat->st_result_mask & P9_STATS_ATIME) {
 650                         inode->i_atime.tv_sec = stat->st_atime_sec;
 651                         inode->i_atime.tv_nsec = stat->st_atime_nsec;
 652                 }
 653                 if (stat->st_result_mask & P9_STATS_MTIME) {
 654                         inode->i_mtime.tv_sec = stat->st_mtime_sec;
 655                         inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
 656                 }
 657                 if (stat->st_result_mask & P9_STATS_CTIME) {
 658                         inode->i_ctime.tv_sec = stat->st_ctime_sec;
 659                         inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
 660                 }
 661                 if (stat->st_result_mask & P9_STATS_UID)
 662                         inode->i_uid = stat->st_uid;
 663                 if (stat->st_result_mask & P9_STATS_GID)
 664                         inode->i_gid = stat->st_gid;
 665                 if (stat->st_result_mask & P9_STATS_NLINK)
 666                         set_nlink(inode, stat->st_nlink);
 667                 if (stat->st_result_mask & P9_STATS_MODE) {
 668                         inode->i_mode = stat->st_mode;
 669                         if ((S_ISBLK(inode->i_mode)) ||
 670                                                 (S_ISCHR(inode->i_mode)))
 671                                 init_special_inode(inode, inode->i_mode,
 672                                                                 inode->i_rdev);
 673                 }
 674                 if (stat->st_result_mask & P9_STATS_RDEV)
 675                         inode->i_rdev = new_decode_dev(stat->st_rdev);
 676                 if (stat->st_result_mask & P9_STATS_SIZE)
 677                         i_size_write(inode, stat->st_size);
 678                 if (stat->st_result_mask & P9_STATS_BLOCKS)
 679                         inode->i_blocks = stat->st_blocks;
 680         }
 681         if (stat->st_result_mask & P9_STATS_GEN)
 682                 inode->i_generation = stat->st_gen;
 683
 684         /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
 685          * because the inode structure does not have fields for them.
 686          */
 687         v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
 688 }
 689
 690 static int
 691 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
 692                 const char *symname)
 693 {
 694         int err;
 695         gid_t gid;
 696         char *name;
 697         struct p9_qid qid;
 698         struct inode *inode;
 699         struct p9_fid *dfid;
 700         struct p9_fid *fid = NULL;
 701         struct v9fs_session_info *v9ses;
 702
 703         name = (char *) dentry->d_name.name;
 704         p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname);
 705         v9ses = v9fs_inode2v9ses(dir);
 706
 707         dfid = v9fs_fid_lookup(dentry->d_parent);
 708         if (IS_ERR(dfid)) {
 709                 err = PTR_ERR(dfid);
 710                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 711                 return err;
 712         }
 713
 714         gid = v9fs_get_fsgid_for_create(dir);
 715
 716         /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
 717         err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid);
 718
 719         if (err < 0) {
 720                 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
 721                 goto error;
 722         }
 723
 724         v9fs_invalidate_inode_attr(dir);
 725         if (v9ses->cache) {
 726                 /* Now walk from the parent so we can get an unopened fid. */
 727                 fid = p9_client_walk(dfid, 1, &name, 1);
 728                 if (IS_ERR(fid)) {
 729                         err = PTR_ERR(fid);
 730                         p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 731                                  err);
 732                         fid = NULL;
 733                         goto error;
 734                 }
 735
 736                 /* instantiate inode and assign the unopened fid to dentry */
 737                 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 738                 if (IS_ERR(inode)) {
 739                         err = PTR_ERR(inode);
 740                         p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
 741                                  err);
 742                         goto error;
 743                 }
 744                 err = v9fs_fid_add(dentry, fid);
 745                 if (err < 0)
 746                         goto error;
 747                 d_instantiate(dentry, inode);
 748                 fid = NULL;
 749         } else {
 750                 /* Not in cached mode. No need to populate inode with stat */
 751                 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0);
 752                 if (IS_ERR(inode)) {
 753                         err = PTR_ERR(inode);
 754                         goto error;
 755                 }
 756                 d_instantiate(dentry, inode);
 757         }
 758
 759 error:
 760         if (fid)
 761                 p9_client_clunk(fid);
 762
 763         return err;
 764 }
 765
 766 /**
 767  * v9fs_vfs_link_dotl - create a hardlink for dotl
 768  * @old_dentry: dentry for file to link to
 769  * @dir: inode destination for new link
 770  * @dentry: dentry for link
 771  *
 772  */
 773
 774 static int
 775 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
 776                 struct dentry *dentry)
 777 {
 778         int err;
 779         char *name;
 780         struct dentry *dir_dentry;
 781         struct p9_fid *dfid, *oldfid;
 782         struct v9fs_session_info *v9ses;
 783
 784         p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %s, new_name: %s\n",
 785                  dir->i_ino, old_dentry->d_name.name, dentry->d_name.name);
 786
 787         v9ses = v9fs_inode2v9ses(dir);
 788         dir_dentry = dentry->d_parent;
 789         dfid = v9fs_fid_lookup(dir_dentry);
 790         if (IS_ERR(dfid))
 791                 return PTR_ERR(dfid);
 792
 793         oldfid = v9fs_fid_lookup(old_dentry);
 794         if (IS_ERR(oldfid))
 795                 return PTR_ERR(oldfid);
 796
 797         name = (char *) dentry->d_name.name;
 798
 799         err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name);
 800
 801         if (err < 0) {
 802                 p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
 803                 return err;
 804         }
 805
 806         v9fs_invalidate_inode_attr(dir);
 807         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 808                 /* Get the latest stat info from server. */
 809                 struct p9_fid *fid;
 810                 fid = v9fs_fid_lookup(old_dentry);
 811                 if (IS_ERR(fid))
 812                         return PTR_ERR(fid);
 813
 814                 v9fs_refresh_inode_dotl(fid, old_dentry->d_inode);
 815         }
 816         ihold(old_dentry->d_inode);
 817         d_instantiate(dentry, old_dentry->d_inode);
 818
 819         return err;
 820 }
 821
 822 /**
 823  * v9fs_vfs_mknod_dotl - create a special file
 824  * @dir: inode destination for new link
 825  * @dentry: dentry for file
 826  * @mode: mode for creation
 827  * @rdev: device associated with special file
 828  *
 829  */
 830 static int
 831 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
 832                 dev_t rdev)
 833 {
 834         int err;
 835         gid_t gid;
 836         char *name;
 837         umode_t mode;
 838         struct v9fs_session_info *v9ses;
 839         struct p9_fid *fid = NULL, *dfid = NULL;
 840         struct inode *inode;
 841         struct p9_qid qid;
 842         struct dentry *dir_dentry;
 843         struct posix_acl *dacl = NULL, *pacl = NULL;
 844
 845         p9_debug(P9_DEBUG_VFS, " %lu,%s mode: %hx MAJOR: %u MINOR: %u\n",
 846                  dir->i_ino, dentry->d_name.name, omode,
 847                  MAJOR(rdev), MINOR(rdev));
 848
 849         if (!new_valid_dev(rdev))
 850                 return -EINVAL;
 851
 852         v9ses = v9fs_inode2v9ses(dir);
 853         dir_dentry = dentry->d_parent;
 854         dfid = v9fs_fid_lookup(dir_dentry);
 855         if (IS_ERR(dfid)) {
 856                 err = PTR_ERR(dfid);
 857                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 858                 dfid = NULL;
 859                 goto error;
 860         }
 861
 862         gid = v9fs_get_fsgid_for_create(dir);
 863         mode = omode;
 864         /* Update mode based on ACL value */
 865         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 866         if (err) {
 867                 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n",
 868                          err);
 869                 goto error;
 870         }
 871         name = (char *) dentry->d_name.name;
 872
 873         err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
 874         if (err < 0)
 875                 goto error;
 876
 877         v9fs_invalidate_inode_attr(dir);
 878         /* instantiate inode and assign the unopened fid to the dentry */
 879         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 880                 fid = p9_client_walk(dfid, 1, &name, 1);
 881                 if (IS_ERR(fid)) {
 882                         err = PTR_ERR(fid);
 883                         p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 884                                  err);
 885                         fid = NULL;
 886                         goto error;
 887                 }
 888
 889                 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 890                 if (IS_ERR(inode)) {
 891                         err = PTR_ERR(inode);
 892                         p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
 893                                  err);
 894                         goto error;
 895                 }
 896                 err = v9fs_fid_add(dentry, fid);
 897                 if (err < 0)
 898                         goto error;
 899                 d_instantiate(dentry, inode);
 900                 fid = NULL;
 901         } else {
 902                 /*
 903                  * Not in cached mode. No need to populate inode with stat.
 904                  * socket syscall returns a fd, so we need instantiate
 905                  */
 906                 inode = v9fs_get_inode(dir->i_sb, mode, rdev);
 907                 if (IS_ERR(inode)) {
 908                         err = PTR_ERR(inode);
 909                         goto error;
 910                 }
 911                 d_instantiate(dentry, inode);
 912         }
 913         /* Now set the ACL based on the default value */
 914         v9fs_set_create_acl(dentry, &dacl, &pacl);
 915 error:
 916         if (fid)
 917                 p9_client_clunk(fid);
 918         v9fs_set_create_acl(NULL, &dacl, &pacl);
 919         return err;
 920 }
 921
 922 /**
 923  * v9fs_vfs_follow_link_dotl - follow a symlink path
 924  * @dentry: dentry for symlink
 925  * @nd: nameidata
 926  *
 927  */
 928
 929 static void *
 930 v9fs_vfs_follow_link_dotl(struct dentry *dentry, struct nameidata *nd)
 931 {
 932         int retval;
 933         struct p9_fid *fid;
 934         char *link = __getname();
 935         char *target;
 936
 937         p9_debug(P9_DEBUG_VFS, "%s\n", dentry->d_name.name);
 938
 939         if (!link) {
 940                 link = ERR_PTR(-ENOMEM);
 941                 goto ndset;
 942         }
 943         fid = v9fs_fid_lookup(dentry);
 944         if (IS_ERR(fid)) {
 945                 __putname(link);
 946                 link = ERR_CAST(fid);
 947                 goto ndset;
 948         }
 949         retval = p9_client_readlink(fid, &target);
 950         if (!retval) {
 951                 strcpy(link, target);
 952                 kfree(target);
 953                 goto ndset;
 954         }
 955         __putname(link);
 956         link = ERR_PTR(retval);
 957 ndset:
 958         nd_set_link(nd, link);
 959         return NULL;
 960 }
 961
 962 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
 963 {
 964         loff_t i_size;
 965         struct p9_stat_dotl *st;
 966         struct v9fs_session_info *v9ses;
 967
 968         v9ses = v9fs_inode2v9ses(inode);
 969         st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
 970         if (IS_ERR(st))
 971                 return PTR_ERR(st);
 972         /*
 973          * Don't update inode if the file type is different
 974          */
 975         if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
 976                 goto out;
 977
 978         spin_lock(&inode->i_lock);
 979         /*
 980          * We don't want to refresh inode->i_size,
 981          * because we may have cached data
 982          */
 983         i_size = inode->i_size;
 984         v9fs_stat2inode_dotl(st, inode);
 985         if (v9ses->cache)
 986                 inode->i_size = i_size;
 987         spin_unlock(&inode->i_lock);
 988 out:
 989         kfree(st);
 990         return 0;
 991 }
 992
 993 const struct inode_operations v9fs_dir_inode_operations_dotl = {
 994         .create = v9fs_vfs_create_dotl,
 995         .atomic_open = v9fs_vfs_atomic_open_dotl,
 996         .lookup = v9fs_vfs_lookup,
 997         .link = v9fs_vfs_link_dotl,
 998         .symlink = v9fs_vfs_symlink_dotl,
 999         .unlink = v9fs_vfs_unlink,
1000         .mkdir = v9fs_vfs_mkdir_dotl,
1001         .rmdir = v9fs_vfs_rmdir,
1002         .mknod = v9fs_vfs_mknod_dotl,
1003         .rename = v9fs_vfs_rename,
1004         .getattr = v9fs_vfs_getattr_dotl,
1005         .setattr = v9fs_vfs_setattr_dotl,
1006         .setxattr = generic_setxattr,
1007         .getxattr = generic_getxattr,
1008         .removexattr = generic_removexattr,
1009         .listxattr = v9fs_listxattr,
1010         .get_acl = v9fs_iop_get_acl,
1011 };
1012
1013 const struct inode_operations v9fs_file_inode_operations_dotl = {
1014         .getattr = v9fs_vfs_getattr_dotl,
1015         .setattr = v9fs_vfs_setattr_dotl,
1016         .setxattr = generic_setxattr,
1017         .getxattr = generic_getxattr,
1018         .removexattr = generic_removexattr,
1019         .listxattr = v9fs_listxattr,
1020         .get_acl = v9fs_iop_get_acl,
1021 };
1022
1023 const struct inode_operations v9fs_symlink_inode_operations_dotl = {
1024         .readlink = generic_readlink,
1025         .follow_link = v9fs_vfs_follow_link_dotl,
1026         .put_link = v9fs_vfs_put_link,
1027         .getattr = v9fs_vfs_getattr_dotl,
1028         .setattr = v9fs_vfs_setattr_dotl,
1029         .setxattr = generic_setxattr,
1030         .getxattr = generic_getxattr,
1031         .removexattr = generic_removexattr,
1032         .listxattr = v9fs_listxattr,
1033 };