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 kgid_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_APPEND,     P9_DOTL_APPEND },
 190                 { O_NONBLOCK,   P9_DOTL_NONBLOCK },
 191                 { O_DSYNC,      P9_DOTL_DSYNC },
 192                 { FASYNC,       P9_DOTL_FASYNC },
 193                 { O_DIRECT,     P9_DOTL_DIRECT },
 194                 { O_LARGEFILE,  P9_DOTL_LARGEFILE },
 195                 { O_DIRECTORY,  P9_DOTL_DIRECTORY },
 196                 { O_NOFOLLOW,   P9_DOTL_NOFOLLOW },
 197                 { O_NOATIME,    P9_DOTL_NOATIME },
 198                 { O_CLOEXEC,    P9_DOTL_CLOEXEC },
 199                 { O_SYNC,       P9_DOTL_SYNC},
 200         };
 201         for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) {
 202                 if (flags & dotl_oflag_map[i].open_flag)
 203                         rflags |= dotl_oflag_map[i].dotl_flag;
 204         }
 205         return rflags;
 206 }
 207
 208 /**
 209  * v9fs_open_to_dotl_flags- convert Linux specific open flags to
 210  * plan 9 open flag.
 211  * @flags: flags to convert
 212  */
 213 int v9fs_open_to_dotl_flags(int flags)
 214 {
 215         int rflags = 0;
 216
 217         /*
 218          * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
 219          * and P9_DOTL_NOACCESS
 220          */
 221         rflags |= flags & O_ACCMODE;
 222         rflags |= v9fs_mapped_dotl_flags(flags);
 223
 224         return rflags;
 225 }
 226
 227 /**
 228  * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
 229  * @dir: directory inode that is being created
 230  * @dentry:  dentry that is being deleted
 231  * @mode: create permissions
 232  *
 233  */
 234
 235 static int
 236 v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
 237                 bool excl)
 238 {
 239         return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
 240 }
 241
 242 static int
 243 v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
 244                           struct file *file, unsigned flags, umode_t omode,
 245                           int *opened)
 246 {
 247         int err = 0;
 248         kgid_t gid;
 249         umode_t mode;
 250         char *name = NULL;
 251         struct p9_qid qid;
 252         struct inode *inode;
 253         struct p9_fid *fid = NULL;
 254         struct v9fs_inode *v9inode;
 255         struct p9_fid *dfid, *ofid, *inode_fid;
 256         struct v9fs_session_info *v9ses;
 257         struct posix_acl *pacl = NULL, *dacl = NULL;
 258         struct dentry *res = NULL;
 259
 260         if (d_unhashed(dentry)) {
 261                 res = v9fs_vfs_lookup(dir, dentry, 0);
 262                 if (IS_ERR(res))
 263                         return PTR_ERR(res);
 264
 265                 if (res)
 266                         dentry = res;
 267         }
 268
 269         /* Only creates */
 270         if (!(flags & O_CREAT))
 271                 return  finish_no_open(file, res);
 272         else if (dentry->d_inode) {
 273                 if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
 274                         return -EEXIST;
 275                 else
 276                         return finish_no_open(file, res);
 277         }
 278
 279         v9ses = v9fs_inode2v9ses(dir);
 280
 281         name = (char *) dentry->d_name.name;
 282         p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%hx\n",
 283                  name, flags, omode);
 284
 285         dfid = v9fs_fid_lookup(dentry->d_parent);
 286         if (IS_ERR(dfid)) {
 287                 err = PTR_ERR(dfid);
 288                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 289                 goto out;
 290         }
 291
 292         /* clone a fid to use for creation */
 293         ofid = p9_client_walk(dfid, 0, NULL, 1);
 294         if (IS_ERR(ofid)) {
 295                 err = PTR_ERR(ofid);
 296                 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
 297                 goto out;
 298         }
 299
 300         gid = v9fs_get_fsgid_for_create(dir);
 301
 302         mode = omode;
 303         /* Update mode based on ACL value */
 304         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 305         if (err) {
 306                 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in creat %d\n",
 307                          err);
 308                 goto error;
 309         }
 310         err = p9_client_create_dotl(ofid, name, v9fs_open_to_dotl_flags(flags),
 311                                     mode, gid, &qid);
 312         if (err < 0) {
 313                 p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in creat %d\n",
 314                          err);
 315                 goto error;
 316         }
 317         v9fs_invalidate_inode_attr(dir);
 318
 319         /* instantiate inode and assign the unopened fid to the dentry */
 320         fid = p9_client_walk(dfid, 1, &name, 1);
 321         if (IS_ERR(fid)) {
 322                 err = PTR_ERR(fid);
 323                 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
 324                 fid = NULL;
 325                 goto error;
 326         }
 327         inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 328         if (IS_ERR(inode)) {
 329                 err = PTR_ERR(inode);
 330                 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err);
 331                 goto error;
 332         }
 333         /* Now set the ACL based on the default value */
 334         v9fs_set_create_acl(inode, fid, dacl, pacl);
 335
 336         v9fs_fid_add(dentry, fid);
 337         d_instantiate(dentry, inode);
 338
 339         v9inode = V9FS_I(inode);
 340         mutex_lock(&v9inode->v_mutex);
 341         if (v9ses->cache && !v9inode->writeback_fid &&
 342             ((flags & O_ACCMODE) != O_RDONLY)) {
 343                 /*
 344                  * clone a fid and add it to writeback_fid
 345                  * we do it during open time instead of
 346                  * page dirty time via write_begin/page_mkwrite
 347                  * because we want write after unlink usecase
 348                  * to work.
 349                  */
 350                 inode_fid = v9fs_writeback_fid(dentry);
 351                 if (IS_ERR(inode_fid)) {
 352                         err = PTR_ERR(inode_fid);
 353                         mutex_unlock(&v9inode->v_mutex);
 354                         goto err_clunk_old_fid;
 355                 }
 356                 v9inode->writeback_fid = (void *) inode_fid;
 357         }
 358         mutex_unlock(&v9inode->v_mutex);
 359         /* Since we are opening a file, assign the open fid to the file */
 360         err = finish_open(file, dentry, generic_file_open, opened);
 361         if (err)
 362                 goto err_clunk_old_fid;
 363         file->private_data = ofid;
 364 #ifdef CONFIG_9P_FSCACHE
 365         if (v9ses->cache)
 366                 v9fs_cache_inode_set_cookie(inode, file);
 367 #endif
 368         *opened |= FILE_CREATED;
 369 out:
 370         v9fs_put_acl(dacl, pacl);
 371         dput(res);
 372         return err;
 373
 374 error:
 375         if (fid)
 376                 p9_client_clunk(fid);
 377 err_clunk_old_fid:
 378         if (ofid)
 379                 p9_client_clunk(ofid);
 380         goto out;
 381 }
 382
 383 /**
 384  * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
 385  * @dir:  inode that is being unlinked
 386  * @dentry: dentry that is being unlinked
 387  * @mode: mode for new directory
 388  *
 389  */
 390
 391 static int v9fs_vfs_mkdir_dotl(struct inode *dir,
 392                                struct dentry *dentry, umode_t omode)
 393 {
 394         int err;
 395         struct v9fs_session_info *v9ses;
 396         struct p9_fid *fid = NULL, *dfid = NULL;
 397         kgid_t gid;
 398         char *name;
 399         umode_t mode;
 400         struct inode *inode;
 401         struct p9_qid qid;
 402         struct dentry *dir_dentry;
 403         struct posix_acl *dacl = NULL, *pacl = NULL;
 404
 405         p9_debug(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
 406         err = 0;
 407         v9ses = v9fs_inode2v9ses(dir);
 408
 409         omode |= S_IFDIR;
 410         if (dir->i_mode & S_ISGID)
 411                 omode |= S_ISGID;
 412
 413         dir_dentry = dentry->d_parent;
 414         dfid = v9fs_fid_lookup(dir_dentry);
 415         if (IS_ERR(dfid)) {
 416                 err = PTR_ERR(dfid);
 417                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 418                 dfid = NULL;
 419                 goto error;
 420         }
 421
 422         gid = v9fs_get_fsgid_for_create(dir);
 423         mode = omode;
 424         /* Update mode based on ACL value */
 425         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 426         if (err) {
 427                 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n",
 428                          err);
 429                 goto error;
 430         }
 431         name = (char *) dentry->d_name.name;
 432         err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
 433         if (err < 0)
 434                 goto error;
 435
 436         fid = p9_client_walk(dfid, 1, &name, 1);
 437         if (IS_ERR(fid)) {
 438                 err = PTR_ERR(fid);
 439                 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 440                          err);
 441                 fid = NULL;
 442                 goto error;
 443         }
 444
 445         /* instantiate inode and assign the unopened fid to the dentry */
 446         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 447                 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 448                 if (IS_ERR(inode)) {
 449                         err = PTR_ERR(inode);
 450                         p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
 451                                  err);
 452                         goto error;
 453                 }
 454                 v9fs_fid_add(dentry, fid);
 455                 v9fs_set_create_acl(inode, fid, dacl, pacl);
 456                 d_instantiate(dentry, inode);
 457                 fid = NULL;
 458                 err = 0;
 459         } else {
 460                 /*
 461                  * Not in cached mode. No need to populate
 462                  * inode with stat. We need to get an inode
 463                  * so that we can set the acl with dentry
 464                  */
 465                 inode = v9fs_get_inode(dir->i_sb, mode, 0);
 466                 if (IS_ERR(inode)) {
 467                         err = PTR_ERR(inode);
 468                         goto error;
 469                 }
 470                 v9fs_set_create_acl(inode, fid, dacl, pacl);
 471                 d_instantiate(dentry, inode);
 472         }
 473         inc_nlink(dir);
 474         v9fs_invalidate_inode_attr(dir);
 475 error:
 476         if (fid)
 477                 p9_client_clunk(fid);
 478         v9fs_put_acl(dacl, pacl);
 479         return err;
 480 }
 481
 482 static int
 483 v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry,
 484                  struct kstat *stat)
 485 {
 486         int err;
 487         struct v9fs_session_info *v9ses;
 488         struct p9_fid *fid;
 489         struct p9_stat_dotl *st;
 490
 491         p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
 492         err = -EPERM;
 493         v9ses = v9fs_dentry2v9ses(dentry);
 494         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 495                 generic_fillattr(dentry->d_inode, stat);
 496                 return 0;
 497         }
 498         fid = v9fs_fid_lookup(dentry);
 499         if (IS_ERR(fid))
 500                 return PTR_ERR(fid);
 501
 502         /* Ask for all the fields in stat structure. Server will return
 503          * whatever it supports
 504          */
 505
 506         st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
 507         if (IS_ERR(st))
 508                 return PTR_ERR(st);
 509
 510         v9fs_stat2inode_dotl(st, dentry->d_inode);
 511         generic_fillattr(dentry->d_inode, stat);
 512         /* Change block size to what the server returned */
 513         stat->blksize = st->st_blksize;
 514
 515         kfree(st);
 516         return 0;
 517 }
 518
 519 /*
 520  * Attribute flags.
 521  */
 522 #define P9_ATTR_MODE            (1 << 0)
 523 #define P9_ATTR_UID             (1 << 1)
 524 #define P9_ATTR_GID             (1 << 2)
 525 #define P9_ATTR_SIZE            (1 << 3)
 526 #define P9_ATTR_ATIME           (1 << 4)
 527 #define P9_ATTR_MTIME           (1 << 5)
 528 #define P9_ATTR_CTIME           (1 << 6)
 529 #define P9_ATTR_ATIME_SET       (1 << 7)
 530 #define P9_ATTR_MTIME_SET       (1 << 8)
 531
 532 struct dotl_iattr_map {
 533         int iattr_valid;
 534         int p9_iattr_valid;
 535 };
 536
 537 static int v9fs_mapped_iattr_valid(int iattr_valid)
 538 {
 539         int i;
 540         int p9_iattr_valid = 0;
 541         struct dotl_iattr_map dotl_iattr_map[] = {
 542                 { ATTR_MODE,            P9_ATTR_MODE },
 543                 { ATTR_UID,             P9_ATTR_UID },
 544                 { ATTR_GID,             P9_ATTR_GID },
 545                 { ATTR_SIZE,            P9_ATTR_SIZE },
 546                 { ATTR_ATIME,           P9_ATTR_ATIME },
 547                 { ATTR_MTIME,           P9_ATTR_MTIME },
 548                 { ATTR_CTIME,           P9_ATTR_CTIME },
 549                 { ATTR_ATIME_SET,       P9_ATTR_ATIME_SET },
 550                 { ATTR_MTIME_SET,       P9_ATTR_MTIME_SET },
 551         };
 552         for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) {
 553                 if (iattr_valid & dotl_iattr_map[i].iattr_valid)
 554                         p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid;
 555         }
 556         return p9_iattr_valid;
 557 }
 558
 559 /**
 560  * v9fs_vfs_setattr_dotl - set file metadata
 561  * @dentry: file whose metadata to set
 562  * @iattr: metadata assignment structure
 563  *
 564  */
 565
 566 int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
 567 {
 568         int retval;
 569         struct v9fs_session_info *v9ses;
 570         struct p9_fid *fid;
 571         struct p9_iattr_dotl p9attr;
 572         struct inode *inode = dentry->d_inode;
 573
 574         p9_debug(P9_DEBUG_VFS, "\n");
 575
 576         retval = inode_change_ok(inode, iattr);
 577         if (retval)
 578                 return retval;
 579
 580         p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid);
 581         p9attr.mode = iattr->ia_mode;
 582         p9attr.uid = iattr->ia_uid;
 583         p9attr.gid = iattr->ia_gid;
 584         p9attr.size = iattr->ia_size;
 585         p9attr.atime_sec = iattr->ia_atime.tv_sec;
 586         p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
 587         p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
 588         p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
 589
 590         retval = -EPERM;
 591         v9ses = v9fs_dentry2v9ses(dentry);
 592         fid = v9fs_fid_lookup(dentry);
 593         if (IS_ERR(fid))
 594                 return PTR_ERR(fid);
 595
 596         /* Write all dirty data */
 597         if (S_ISREG(inode->i_mode))
 598                 filemap_write_and_wait(inode->i_mapping);
 599
 600         retval = p9_client_setattr(fid, &p9attr);
 601         if (retval < 0)
 602                 return retval;
 603
 604         if ((iattr->ia_valid & ATTR_SIZE) &&
 605             iattr->ia_size != i_size_read(inode))
 606                 truncate_setsize(inode, iattr->ia_size);
 607
 608         v9fs_invalidate_inode_attr(inode);
 609         setattr_copy(inode, iattr);
 610         mark_inode_dirty(inode);
 611         if (iattr->ia_valid & ATTR_MODE) {
 612                 /* We also want to update ACL when we update mode bits */
 613                 retval = v9fs_acl_chmod(inode, fid);
 614                 if (retval < 0)
 615                         return retval;
 616         }
 617         return 0;
 618 }
 619
 620 /**
 621  * v9fs_stat2inode_dotl - populate an inode structure with stat info
 622  * @stat: stat structure
 623  * @inode: inode to populate
 624  * @sb: superblock of filesystem
 625  *
 626  */
 627
 628 void
 629 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode)
 630 {
 631         umode_t mode;
 632         struct v9fs_inode *v9inode = V9FS_I(inode);
 633
 634         if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
 635                 inode->i_atime.tv_sec = stat->st_atime_sec;
 636                 inode->i_atime.tv_nsec = stat->st_atime_nsec;
 637                 inode->i_mtime.tv_sec = stat->st_mtime_sec;
 638                 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
 639                 inode->i_ctime.tv_sec = stat->st_ctime_sec;
 640                 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
 641                 inode->i_uid = stat->st_uid;
 642                 inode->i_gid = stat->st_gid;
 643                 set_nlink(inode, stat->st_nlink);
 644
 645                 mode = stat->st_mode & S_IALLUGO;
 646                 mode |= inode->i_mode & ~S_IALLUGO;
 647                 inode->i_mode = mode;
 648
 649                 i_size_write(inode, stat->st_size);
 650                 inode->i_blocks = stat->st_blocks;
 651         } else {
 652                 if (stat->st_result_mask & P9_STATS_ATIME) {
 653                         inode->i_atime.tv_sec = stat->st_atime_sec;
 654                         inode->i_atime.tv_nsec = stat->st_atime_nsec;
 655                 }
 656                 if (stat->st_result_mask & P9_STATS_MTIME) {
 657                         inode->i_mtime.tv_sec = stat->st_mtime_sec;
 658                         inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
 659                 }
 660                 if (stat->st_result_mask & P9_STATS_CTIME) {
 661                         inode->i_ctime.tv_sec = stat->st_ctime_sec;
 662                         inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
 663                 }
 664                 if (stat->st_result_mask & P9_STATS_UID)
 665                         inode->i_uid = stat->st_uid;
 666                 if (stat->st_result_mask & P9_STATS_GID)
 667                         inode->i_gid = stat->st_gid;
 668                 if (stat->st_result_mask & P9_STATS_NLINK)
 669                         set_nlink(inode, stat->st_nlink);
 670                 if (stat->st_result_mask & P9_STATS_MODE) {
 671                         inode->i_mode = stat->st_mode;
 672                         if ((S_ISBLK(inode->i_mode)) ||
 673                                                 (S_ISCHR(inode->i_mode)))
 674                                 init_special_inode(inode, inode->i_mode,
 675                                                                 inode->i_rdev);
 676                 }
 677                 if (stat->st_result_mask & P9_STATS_RDEV)
 678                         inode->i_rdev = new_decode_dev(stat->st_rdev);
 679                 if (stat->st_result_mask & P9_STATS_SIZE)
 680                         i_size_write(inode, stat->st_size);
 681                 if (stat->st_result_mask & P9_STATS_BLOCKS)
 682                         inode->i_blocks = stat->st_blocks;
 683         }
 684         if (stat->st_result_mask & P9_STATS_GEN)
 685                 inode->i_generation = stat->st_gen;
 686
 687         /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
 688          * because the inode structure does not have fields for them.
 689          */
 690         v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
 691 }
 692
 693 static int
 694 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
 695                 const char *symname)
 696 {
 697         int err;
 698         kgid_t gid;
 699         char *name;
 700         struct p9_qid qid;
 701         struct inode *inode;
 702         struct p9_fid *dfid;
 703         struct p9_fid *fid = NULL;
 704         struct v9fs_session_info *v9ses;
 705
 706         name = (char *) dentry->d_name.name;
 707         p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname);
 708         v9ses = v9fs_inode2v9ses(dir);
 709
 710         dfid = v9fs_fid_lookup(dentry->d_parent);
 711         if (IS_ERR(dfid)) {
 712                 err = PTR_ERR(dfid);
 713                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 714                 return err;
 715         }
 716
 717         gid = v9fs_get_fsgid_for_create(dir);
 718
 719         /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
 720         err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid);
 721
 722         if (err < 0) {
 723                 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
 724                 goto error;
 725         }
 726
 727         v9fs_invalidate_inode_attr(dir);
 728         if (v9ses->cache) {
 729                 /* Now walk from the parent so we can get an unopened fid. */
 730                 fid = p9_client_walk(dfid, 1, &name, 1);
 731                 if (IS_ERR(fid)) {
 732                         err = PTR_ERR(fid);
 733                         p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 734                                  err);
 735                         fid = NULL;
 736                         goto error;
 737                 }
 738
 739                 /* instantiate inode and assign the unopened fid to dentry */
 740                 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 741                 if (IS_ERR(inode)) {
 742                         err = PTR_ERR(inode);
 743                         p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
 744                                  err);
 745                         goto error;
 746                 }
 747                 v9fs_fid_add(dentry, fid);
 748                 d_instantiate(dentry, inode);
 749                 fid = NULL;
 750                 err = 0;
 751         } else {
 752                 /* Not in cached mode. No need to populate inode with stat */
 753                 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0);
 754                 if (IS_ERR(inode)) {
 755                         err = PTR_ERR(inode);
 756                         goto error;
 757                 }
 758                 d_instantiate(dentry, inode);
 759         }
 760
 761 error:
 762         if (fid)
 763                 p9_client_clunk(fid);
 764
 765         return err;
 766 }
 767
 768 /**
 769  * v9fs_vfs_link_dotl - create a hardlink for dotl
 770  * @old_dentry: dentry for file to link to
 771  * @dir: inode destination for new link
 772  * @dentry: dentry for link
 773  *
 774  */
 775
 776 static int
 777 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
 778                 struct dentry *dentry)
 779 {
 780         int err;
 781         char *name;
 782         struct dentry *dir_dentry;
 783         struct p9_fid *dfid, *oldfid;
 784         struct v9fs_session_info *v9ses;
 785
 786         p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %s, new_name: %s\n",
 787                  dir->i_ino, old_dentry->d_name.name, dentry->d_name.name);
 788
 789         v9ses = v9fs_inode2v9ses(dir);
 790         dir_dentry = dentry->d_parent;
 791         dfid = v9fs_fid_lookup(dir_dentry);
 792         if (IS_ERR(dfid))
 793                 return PTR_ERR(dfid);
 794
 795         oldfid = v9fs_fid_lookup(old_dentry);
 796         if (IS_ERR(oldfid))
 797                 return PTR_ERR(oldfid);
 798
 799         name = (char *) dentry->d_name.name;
 800
 801         err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name);
 802
 803         if (err < 0) {
 804                 p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
 805                 return err;
 806         }
 807
 808         v9fs_invalidate_inode_attr(dir);
 809         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 810                 /* Get the latest stat info from server. */
 811                 struct p9_fid *fid;
 812                 fid = v9fs_fid_lookup(old_dentry);
 813                 if (IS_ERR(fid))
 814                         return PTR_ERR(fid);
 815
 816                 v9fs_refresh_inode_dotl(fid, old_dentry->d_inode);
 817         }
 818         ihold(old_dentry->d_inode);
 819         d_instantiate(dentry, old_dentry->d_inode);
 820
 821         return err;
 822 }
 823
 824 /**
 825  * v9fs_vfs_mknod_dotl - create a special file
 826  * @dir: inode destination for new link
 827  * @dentry: dentry for file
 828  * @mode: mode for creation
 829  * @rdev: device associated with special file
 830  *
 831  */
 832 static int
 833 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
 834                 dev_t rdev)
 835 {
 836         int err;
 837         kgid_t gid;
 838         char *name;
 839         umode_t mode;
 840         struct v9fs_session_info *v9ses;
 841         struct p9_fid *fid = NULL, *dfid = NULL;
 842         struct inode *inode;
 843         struct p9_qid qid;
 844         struct dentry *dir_dentry;
 845         struct posix_acl *dacl = NULL, *pacl = NULL;
 846
 847         p9_debug(P9_DEBUG_VFS, " %lu,%s mode: %hx MAJOR: %u MINOR: %u\n",
 848                  dir->i_ino, dentry->d_name.name, omode,
 849                  MAJOR(rdev), MINOR(rdev));
 850
 851         if (!new_valid_dev(rdev))
 852                 return -EINVAL;
 853
 854         v9ses = v9fs_inode2v9ses(dir);
 855         dir_dentry = dentry->d_parent;
 856         dfid = v9fs_fid_lookup(dir_dentry);
 857         if (IS_ERR(dfid)) {
 858                 err = PTR_ERR(dfid);
 859                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 860                 dfid = NULL;
 861                 goto error;
 862         }
 863
 864         gid = v9fs_get_fsgid_for_create(dir);
 865         mode = omode;
 866         /* Update mode based on ACL value */
 867         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 868         if (err) {
 869                 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n",
 870                          err);
 871                 goto error;
 872         }
 873         name = (char *) dentry->d_name.name;
 874
 875         err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
 876         if (err < 0)
 877                 goto error;
 878
 879         v9fs_invalidate_inode_attr(dir);
 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         /* instantiate inode and assign the unopened fid to the dentry */
 890         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 891                 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 892                 if (IS_ERR(inode)) {
 893                         err = PTR_ERR(inode);
 894                         p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
 895                                  err);
 896                         goto error;
 897                 }
 898                 v9fs_set_create_acl(inode, fid, dacl, pacl);
 899                 v9fs_fid_add(dentry, fid);
 900                 d_instantiate(dentry, inode);
 901                 fid = NULL;
 902                 err = 0;
 903         } else {
 904                 /*
 905                  * Not in cached mode. No need to populate inode with stat.
 906                  * socket syscall returns a fd, so we need instantiate
 907                  */
 908                 inode = v9fs_get_inode(dir->i_sb, mode, rdev);
 909                 if (IS_ERR(inode)) {
 910                         err = PTR_ERR(inode);
 911                         goto error;
 912                 }
 913                 v9fs_set_create_acl(inode, fid, dacl, pacl);
 914                 d_instantiate(dentry, inode);
 915         }
 916 error:
 917         if (fid)
 918                 p9_client_clunk(fid);
 919         v9fs_put_acl(dacl, pacl);
 920         return err;
 921 }
 922
 923 /**
 924  * v9fs_vfs_follow_link_dotl - follow a symlink path
 925  * @dentry: dentry for symlink
 926  * @nd: nameidata
 927  *
 928  */
 929
 930 static void *
 931 v9fs_vfs_follow_link_dotl(struct dentry *dentry, struct nameidata *nd)
 932 {
 933         int retval;
 934         struct p9_fid *fid;
 935         char *link = __getname();
 936         char *target;
 937
 938         p9_debug(P9_DEBUG_VFS, "%s\n", dentry->d_name.name);
 939
 940         if (!link) {
 941                 link = ERR_PTR(-ENOMEM);
 942                 goto ndset;
 943         }
 944         fid = v9fs_fid_lookup(dentry);
 945         if (IS_ERR(fid)) {
 946                 __putname(link);
 947                 link = ERR_CAST(fid);
 948                 goto ndset;
 949         }
 950         retval = p9_client_readlink(fid, &target);
 951         if (!retval) {
 952                 strcpy(link, target);
 953                 kfree(target);
 954                 goto ndset;
 955         }
 956         __putname(link);
 957         link = ERR_PTR(retval);
 958 ndset:
 959         nd_set_link(nd, link);
 960         return NULL;
 961 }
 962
 963 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
 964 {
 965         loff_t i_size;
 966         struct p9_stat_dotl *st;
 967         struct v9fs_session_info *v9ses;
 968
 969         v9ses = v9fs_inode2v9ses(inode);
 970         st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
 971         if (IS_ERR(st))
 972                 return PTR_ERR(st);
 973         /*
 974          * Don't update inode if the file type is different
 975          */
 976         if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
 977                 goto out;
 978
 979         spin_lock(&inode->i_lock);
 980         /*
 981          * We don't want to refresh inode->i_size,
 982          * because we may have cached data
 983          */
 984         i_size = inode->i_size;
 985         v9fs_stat2inode_dotl(st, inode);
 986         if (v9ses->cache)
 987                 inode->i_size = i_size;
 988         spin_unlock(&inode->i_lock);
 989 out:
 990         kfree(st);
 991         return 0;
 992 }
 993
 994 const struct inode_operations v9fs_dir_inode_operations_dotl = {
 995         .create = v9fs_vfs_create_dotl,
 996         .atomic_open = v9fs_vfs_atomic_open_dotl,
 997         .lookup = v9fs_vfs_lookup,
 998         .link = v9fs_vfs_link_dotl,
 999         .symlink = v9fs_vfs_symlink_dotl,
1000         .unlink = v9fs_vfs_unlink,
1001         .mkdir = v9fs_vfs_mkdir_dotl,
1002         .rmdir = v9fs_vfs_rmdir,
1003         .mknod = v9fs_vfs_mknod_dotl,
1004         .rename = v9fs_vfs_rename,
1005         .getattr = v9fs_vfs_getattr_dotl,
1006         .setattr = v9fs_vfs_setattr_dotl,
1007         .setxattr = generic_setxattr,
1008         .getxattr = generic_getxattr,
1009         .removexattr = generic_removexattr,
1010         .listxattr = v9fs_listxattr,
1011         .get_acl = v9fs_iop_get_acl,
1012 };
1013
1014 const struct inode_operations v9fs_file_inode_operations_dotl = {
1015         .getattr = v9fs_vfs_getattr_dotl,
1016         .setattr = v9fs_vfs_setattr_dotl,
1017         .setxattr = generic_setxattr,
1018         .getxattr = generic_getxattr,
1019         .removexattr = generic_removexattr,
1020         .listxattr = v9fs_listxattr,
1021         .get_acl = v9fs_iop_get_acl,
1022 };
1023
1024 const struct inode_operations v9fs_symlink_inode_operations_dotl = {
1025         .readlink = generic_readlink,
1026         .follow_link = v9fs_vfs_follow_link_dotl,
1027         .put_link = v9fs_vfs_put_link,
1028         .getattr = v9fs_vfs_getattr_dotl,
1029         .setattr = v9fs_vfs_setattr_dotl,
1030         .setxattr = generic_setxattr,
1031         .getxattr = generic_getxattr,
1032         .removexattr = generic_removexattr,
1033         .listxattr = v9fs_listxattr,
1034 };