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         iget_failed(inode);
 155         return ERR_PTR(retval);
 156
 157 }
 158
 159 struct inode *
 160 v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
 161                          struct super_block *sb, int new)
 162 {
 163         struct p9_stat_dotl *st;
 164         struct inode *inode = NULL;
 165
 166         st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN);
 167         if (IS_ERR(st))
 168                 return ERR_CAST(st);
 169
 170         inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new);
 171         kfree(st);
 172         return inode;
 173 }
 174
 175 struct dotl_openflag_map {
 176         int open_flag;
 177         int dotl_flag;
 178 };
 179
 180 static int v9fs_mapped_dotl_flags(int flags)
 181 {
 182         int i;
 183         int rflags = 0;
 184         struct dotl_openflag_map dotl_oflag_map[] = {
 185                 { O_CREAT,      P9_DOTL_CREATE },
 186                 { O_EXCL,       P9_DOTL_EXCL },
 187                 { O_NOCTTY,     P9_DOTL_NOCTTY },
 188                 { O_APPEND,     P9_DOTL_APPEND },
 189                 { O_NONBLOCK,   P9_DOTL_NONBLOCK },
 190                 { O_DSYNC,      P9_DOTL_DSYNC },
 191                 { FASYNC,       P9_DOTL_FASYNC },
 192                 { O_DIRECT,     P9_DOTL_DIRECT },
 193                 { O_LARGEFILE,  P9_DOTL_LARGEFILE },
 194                 { O_DIRECTORY,  P9_DOTL_DIRECTORY },
 195                 { O_NOFOLLOW,   P9_DOTL_NOFOLLOW },
 196                 { O_NOATIME,    P9_DOTL_NOATIME },
 197                 { O_CLOEXEC,    P9_DOTL_CLOEXEC },
 198                 { O_SYNC,       P9_DOTL_SYNC},
 199         };
 200         for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) {
 201                 if (flags & dotl_oflag_map[i].open_flag)
 202                         rflags |= dotl_oflag_map[i].dotl_flag;
 203         }
 204         return rflags;
 205 }
 206
 207 /**
 208  * v9fs_open_to_dotl_flags- convert Linux specific open flags to
 209  * plan 9 open flag.
 210  * @flags: flags to convert
 211  */
 212 int v9fs_open_to_dotl_flags(int flags)
 213 {
 214         int rflags = 0;
 215
 216         /*
 217          * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
 218          * and P9_DOTL_NOACCESS
 219          */
 220         rflags |= flags & O_ACCMODE;
 221         rflags |= v9fs_mapped_dotl_flags(flags);
 222
 223         return rflags;
 224 }
 225
 226 /**
 227  * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
 228  * @dir: directory inode that is being created
 229  * @dentry:  dentry that is being deleted
 230  * @mode: create permissions
 231  *
 232  */
 233
 234 static int
 235 v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
 236                 bool excl)
 237 {
 238         return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
 239 }
 240
 241 static int
 242 v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
 243                           struct file *file, unsigned flags, umode_t omode,
 244                           int *opened)
 245 {
 246         int err = 0;
 247         kgid_t gid;
 248         umode_t mode;
 249         char *name = NULL;
 250         struct p9_qid qid;
 251         struct inode *inode;
 252         struct p9_fid *fid = NULL;
 253         struct v9fs_inode *v9inode;
 254         struct p9_fid *dfid, *ofid, *inode_fid;
 255         struct v9fs_session_info *v9ses;
 256         struct posix_acl *pacl = NULL, *dacl = NULL;
 257         struct dentry *res = NULL;
 258
 259         if (d_unhashed(dentry)) {
 260                 res = v9fs_vfs_lookup(dir, dentry, 0);
 261                 if (IS_ERR(res))
 262                         return PTR_ERR(res);
 263
 264                 if (res)
 265                         dentry = res;
 266         }
 267
 268         /* Only creates */
 269         if (!(flags & O_CREAT))
 270                 return  finish_no_open(file, res);
 271         else if (dentry->d_inode) {
 272                 if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
 273                         return -EEXIST;
 274                 else
 275                         return finish_no_open(file, res);
 276         }
 277
 278         v9ses = v9fs_inode2v9ses(dir);
 279
 280         name = (char *) dentry->d_name.name;
 281         p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%hx\n",
 282                  name, flags, omode);
 283
 284         dfid = v9fs_fid_lookup(dentry->d_parent);
 285         if (IS_ERR(dfid)) {
 286                 err = PTR_ERR(dfid);
 287                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 288                 goto out;
 289         }
 290
 291         /* clone a fid to use for creation */
 292         ofid = p9_client_walk(dfid, 0, NULL, 1);
 293         if (IS_ERR(ofid)) {
 294                 err = PTR_ERR(ofid);
 295                 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
 296                 goto out;
 297         }
 298
 299         gid = v9fs_get_fsgid_for_create(dir);
 300
 301         mode = omode;
 302         /* Update mode based on ACL value */
 303         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 304         if (err) {
 305                 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in creat %d\n",
 306                          err);
 307                 goto error;
 308         }
 309         err = p9_client_create_dotl(ofid, name, v9fs_open_to_dotl_flags(flags),
 310                                     mode, gid, &qid);
 311         if (err < 0) {
 312                 p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in creat %d\n",
 313                          err);
 314                 goto error;
 315         }
 316         v9fs_invalidate_inode_attr(dir);
 317
 318         /* instantiate inode and assign the unopened fid to the dentry */
 319         fid = p9_client_walk(dfid, 1, &name, 1);
 320         if (IS_ERR(fid)) {
 321                 err = PTR_ERR(fid);
 322                 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
 323                 fid = NULL;
 324                 goto error;
 325         }
 326         inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 327         if (IS_ERR(inode)) {
 328                 err = PTR_ERR(inode);
 329                 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err);
 330                 goto error;
 331         }
 332         /* Now set the ACL based on the default value */
 333         v9fs_set_create_acl(inode, fid, dacl, pacl);
 334
 335         v9fs_fid_add(dentry, fid);
 336         d_instantiate(dentry, inode);
 337
 338         v9inode = V9FS_I(inode);
 339         mutex_lock(&v9inode->v_mutex);
 340         if (v9ses->cache && !v9inode->writeback_fid &&
 341             ((flags & O_ACCMODE) != O_RDONLY)) {
 342                 /*
 343                  * clone a fid and add it to writeback_fid
 344                  * we do it during open time instead of
 345                  * page dirty time via write_begin/page_mkwrite
 346                  * because we want write after unlink usecase
 347                  * to work.
 348                  */
 349                 inode_fid = v9fs_writeback_fid(dentry);
 350                 if (IS_ERR(inode_fid)) {
 351                         err = PTR_ERR(inode_fid);
 352                         mutex_unlock(&v9inode->v_mutex);
 353                         goto err_clunk_old_fid;
 354                 }
 355                 v9inode->writeback_fid = (void *) inode_fid;
 356         }
 357         mutex_unlock(&v9inode->v_mutex);
 358         /* Since we are opening a file, assign the open fid to the file */
 359         err = finish_open(file, dentry, generic_file_open, opened);
 360         if (err)
 361                 goto err_clunk_old_fid;
 362         file->private_data = ofid;
 363 #ifdef CONFIG_9P_FSCACHE
 364         if (v9ses->cache)
 365                 v9fs_cache_inode_set_cookie(inode, file);
 366 #endif
 367         *opened |= FILE_CREATED;
 368 out:
 369         v9fs_put_acl(dacl, pacl);
 370         dput(res);
 371         return err;
 372
 373 error:
 374         if (fid)
 375                 p9_client_clunk(fid);
 376 err_clunk_old_fid:
 377         if (ofid)
 378                 p9_client_clunk(ofid);
 379         goto out;
 380 }
 381
 382 /**
 383  * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
 384  * @dir:  inode that is being unlinked
 385  * @dentry: dentry that is being unlinked
 386  * @mode: mode for new directory
 387  *
 388  */
 389
 390 static int v9fs_vfs_mkdir_dotl(struct inode *dir,
 391                                struct dentry *dentry, umode_t omode)
 392 {
 393         int err;
 394         struct v9fs_session_info *v9ses;
 395         struct p9_fid *fid = NULL, *dfid = NULL;
 396         kgid_t gid;
 397         char *name;
 398         umode_t mode;
 399         struct inode *inode;
 400         struct p9_qid qid;
 401         struct dentry *dir_dentry;
 402         struct posix_acl *dacl = NULL, *pacl = NULL;
 403
 404         p9_debug(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
 405         err = 0;
 406         v9ses = v9fs_inode2v9ses(dir);
 407
 408         omode |= S_IFDIR;
 409         if (dir->i_mode & S_ISGID)
 410                 omode |= S_ISGID;
 411
 412         dir_dentry = dentry->d_parent;
 413         dfid = v9fs_fid_lookup(dir_dentry);
 414         if (IS_ERR(dfid)) {
 415                 err = PTR_ERR(dfid);
 416                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 417                 dfid = NULL;
 418                 goto error;
 419         }
 420
 421         gid = v9fs_get_fsgid_for_create(dir);
 422         mode = omode;
 423         /* Update mode based on ACL value */
 424         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 425         if (err) {
 426                 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n",
 427                          err);
 428                 goto error;
 429         }
 430         name = (char *) dentry->d_name.name;
 431         err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
 432         if (err < 0)
 433                 goto error;
 434
 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         /* instantiate inode and assign the unopened fid to the dentry */
 445         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 446                 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 447                 if (IS_ERR(inode)) {
 448                         err = PTR_ERR(inode);
 449                         p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
 450                                  err);
 451                         goto error;
 452                 }
 453                 v9fs_fid_add(dentry, fid);
 454                 v9fs_set_create_acl(inode, fid, dacl, pacl);
 455                 d_instantiate(dentry, inode);
 456                 fid = NULL;
 457                 err = 0;
 458         } else {
 459                 /*
 460                  * Not in cached mode. No need to populate
 461                  * inode with stat. We need to get an inode
 462                  * so that we can set the acl with dentry
 463                  */
 464                 inode = v9fs_get_inode(dir->i_sb, mode, 0);
 465                 if (IS_ERR(inode)) {
 466                         err = PTR_ERR(inode);
 467                         goto error;
 468                 }
 469                 v9fs_set_create_acl(inode, fid, dacl, pacl);
 470                 d_instantiate(dentry, inode);
 471         }
 472         inc_nlink(dir);
 473         v9fs_invalidate_inode_attr(dir);
 474 error:
 475         if (fid)
 476                 p9_client_clunk(fid);
 477         v9fs_put_acl(dacl, pacl);
 478         return err;
 479 }
 480
 481 static int
 482 v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry,
 483                  struct kstat *stat)
 484 {
 485         int err;
 486         struct v9fs_session_info *v9ses;
 487         struct p9_fid *fid;
 488         struct p9_stat_dotl *st;
 489
 490         p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
 491         err = -EPERM;
 492         v9ses = v9fs_dentry2v9ses(dentry);
 493         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 494                 generic_fillattr(dentry->d_inode, stat);
 495                 return 0;
 496         }
 497         fid = v9fs_fid_lookup(dentry);
 498         if (IS_ERR(fid))
 499                 return PTR_ERR(fid);
 500
 501         /* Ask for all the fields in stat structure. Server will return
 502          * whatever it supports
 503          */
 504
 505         st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
 506         if (IS_ERR(st))
 507                 return PTR_ERR(st);
 508
 509         v9fs_stat2inode_dotl(st, dentry->d_inode);
 510         generic_fillattr(dentry->d_inode, stat);
 511         /* Change block size to what the server returned */
 512         stat->blksize = st->st_blksize;
 513
 514         kfree(st);
 515         return 0;
 516 }
 517
 518 /*
 519  * Attribute flags.
 520  */
 521 #define P9_ATTR_MODE            (1 << 0)
 522 #define P9_ATTR_UID             (1 << 1)
 523 #define P9_ATTR_GID             (1 << 2)
 524 #define P9_ATTR_SIZE            (1 << 3)
 525 #define P9_ATTR_ATIME           (1 << 4)
 526 #define P9_ATTR_MTIME           (1 << 5)
 527 #define P9_ATTR_CTIME           (1 << 6)
 528 #define P9_ATTR_ATIME_SET       (1 << 7)
 529 #define P9_ATTR_MTIME_SET       (1 << 8)
 530
 531 struct dotl_iattr_map {
 532         int iattr_valid;
 533         int p9_iattr_valid;
 534 };
 535
 536 static int v9fs_mapped_iattr_valid(int iattr_valid)
 537 {
 538         int i;
 539         int p9_iattr_valid = 0;
 540         struct dotl_iattr_map dotl_iattr_map[] = {
 541                 { ATTR_MODE,            P9_ATTR_MODE },
 542                 { ATTR_UID,             P9_ATTR_UID },
 543                 { ATTR_GID,             P9_ATTR_GID },
 544                 { ATTR_SIZE,            P9_ATTR_SIZE },
 545                 { ATTR_ATIME,           P9_ATTR_ATIME },
 546                 { ATTR_MTIME,           P9_ATTR_MTIME },
 547                 { ATTR_CTIME,           P9_ATTR_CTIME },
 548                 { ATTR_ATIME_SET,       P9_ATTR_ATIME_SET },
 549                 { ATTR_MTIME_SET,       P9_ATTR_MTIME_SET },
 550         };
 551         for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) {
 552                 if (iattr_valid & dotl_iattr_map[i].iattr_valid)
 553                         p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid;
 554         }
 555         return p9_iattr_valid;
 556 }
 557
 558 /**
 559  * v9fs_vfs_setattr_dotl - set file metadata
 560  * @dentry: file whose metadata to set
 561  * @iattr: metadata assignment structure
 562  *
 563  */
 564
 565 int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
 566 {
 567         int retval;
 568         struct v9fs_session_info *v9ses;
 569         struct p9_fid *fid;
 570         struct p9_iattr_dotl p9attr;
 571         struct inode *inode = dentry->d_inode;
 572
 573         p9_debug(P9_DEBUG_VFS, "\n");
 574
 575         retval = inode_change_ok(inode, iattr);
 576         if (retval)
 577                 return retval;
 578
 579         p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid);
 580         p9attr.mode = iattr->ia_mode;
 581         p9attr.uid = iattr->ia_uid;
 582         p9attr.gid = iattr->ia_gid;
 583         p9attr.size = iattr->ia_size;
 584         p9attr.atime_sec = iattr->ia_atime.tv_sec;
 585         p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
 586         p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
 587         p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
 588
 589         retval = -EPERM;
 590         v9ses = v9fs_dentry2v9ses(dentry);
 591         fid = v9fs_fid_lookup(dentry);
 592         if (IS_ERR(fid))
 593                 return PTR_ERR(fid);
 594
 595         /* Write all dirty data */
 596         if (S_ISREG(inode->i_mode))
 597                 filemap_write_and_wait(inode->i_mapping);
 598
 599         retval = p9_client_setattr(fid, &p9attr);
 600         if (retval < 0)
 601                 return retval;
 602
 603         if ((iattr->ia_valid & ATTR_SIZE) &&
 604             iattr->ia_size != i_size_read(inode))
 605                 truncate_setsize(inode, iattr->ia_size);
 606
 607         v9fs_invalidate_inode_attr(inode);
 608         setattr_copy(inode, iattr);
 609         mark_inode_dirty(inode);
 610         if (iattr->ia_valid & ATTR_MODE) {
 611                 /* We also want to update ACL when we update mode bits */
 612                 retval = v9fs_acl_chmod(inode, fid);
 613                 if (retval < 0)
 614                         return retval;
 615         }
 616         return 0;
 617 }
 618
 619 /**
 620  * v9fs_stat2inode_dotl - populate an inode structure with stat info
 621  * @stat: stat structure
 622  * @inode: inode to populate
 623  * @sb: superblock of filesystem
 624  *
 625  */
 626
 627 void
 628 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode)
 629 {
 630         umode_t mode;
 631         struct v9fs_inode *v9inode = V9FS_I(inode);
 632
 633         if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
 634                 inode->i_atime.tv_sec = stat->st_atime_sec;
 635                 inode->i_atime.tv_nsec = stat->st_atime_nsec;
 636                 inode->i_mtime.tv_sec = stat->st_mtime_sec;
 637                 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
 638                 inode->i_ctime.tv_sec = stat->st_ctime_sec;
 639                 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
 640                 inode->i_uid = stat->st_uid;
 641                 inode->i_gid = stat->st_gid;
 642                 set_nlink(inode, stat->st_nlink);
 643
 644                 mode = stat->st_mode & S_IALLUGO;
 645                 mode |= inode->i_mode & ~S_IALLUGO;
 646                 inode->i_mode = mode;
 647
 648                 i_size_write(inode, stat->st_size);
 649                 inode->i_blocks = stat->st_blocks;
 650         } else {
 651                 if (stat->st_result_mask & P9_STATS_ATIME) {
 652                         inode->i_atime.tv_sec = stat->st_atime_sec;
 653                         inode->i_atime.tv_nsec = stat->st_atime_nsec;
 654                 }
 655                 if (stat->st_result_mask & P9_STATS_MTIME) {
 656                         inode->i_mtime.tv_sec = stat->st_mtime_sec;
 657                         inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
 658                 }
 659                 if (stat->st_result_mask & P9_STATS_CTIME) {
 660                         inode->i_ctime.tv_sec = stat->st_ctime_sec;
 661                         inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
 662                 }
 663                 if (stat->st_result_mask & P9_STATS_UID)
 664                         inode->i_uid = stat->st_uid;
 665                 if (stat->st_result_mask & P9_STATS_GID)
 666                         inode->i_gid = stat->st_gid;
 667                 if (stat->st_result_mask & P9_STATS_NLINK)
 668                         set_nlink(inode, stat->st_nlink);
 669                 if (stat->st_result_mask & P9_STATS_MODE) {
 670                         inode->i_mode = stat->st_mode;
 671                         if ((S_ISBLK(inode->i_mode)) ||
 672                                                 (S_ISCHR(inode->i_mode)))
 673                                 init_special_inode(inode, inode->i_mode,
 674                                                                 inode->i_rdev);
 675                 }
 676                 if (stat->st_result_mask & P9_STATS_RDEV)
 677                         inode->i_rdev = new_decode_dev(stat->st_rdev);
 678                 if (stat->st_result_mask & P9_STATS_SIZE)
 679                         i_size_write(inode, stat->st_size);
 680                 if (stat->st_result_mask & P9_STATS_BLOCKS)
 681                         inode->i_blocks = stat->st_blocks;
 682         }
 683         if (stat->st_result_mask & P9_STATS_GEN)
 684                 inode->i_generation = stat->st_gen;
 685
 686         /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
 687          * because the inode structure does not have fields for them.
 688          */
 689         v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
 690 }
 691
 692 static int
 693 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
 694                 const char *symname)
 695 {
 696         int err;
 697         kgid_t gid;
 698         char *name;
 699         struct p9_qid qid;
 700         struct inode *inode;
 701         struct p9_fid *dfid;
 702         struct p9_fid *fid = NULL;
 703         struct v9fs_session_info *v9ses;
 704
 705         name = (char *) dentry->d_name.name;
 706         p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname);
 707         v9ses = v9fs_inode2v9ses(dir);
 708
 709         dfid = v9fs_fid_lookup(dentry->d_parent);
 710         if (IS_ERR(dfid)) {
 711                 err = PTR_ERR(dfid);
 712                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 713                 return err;
 714         }
 715
 716         gid = v9fs_get_fsgid_for_create(dir);
 717
 718         /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
 719         err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid);
 720
 721         if (err < 0) {
 722                 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
 723                 goto error;
 724         }
 725
 726         v9fs_invalidate_inode_attr(dir);
 727         if (v9ses->cache) {
 728                 /* Now walk from the parent so we can get an unopened fid. */
 729                 fid = p9_client_walk(dfid, 1, &name, 1);
 730                 if (IS_ERR(fid)) {
 731                         err = PTR_ERR(fid);
 732                         p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 733                                  err);
 734                         fid = NULL;
 735                         goto error;
 736                 }
 737
 738                 /* instantiate inode and assign the unopened fid to dentry */
 739                 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 740                 if (IS_ERR(inode)) {
 741                         err = PTR_ERR(inode);
 742                         p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
 743                                  err);
 744                         goto error;
 745                 }
 746                 v9fs_fid_add(dentry, fid);
 747                 d_instantiate(dentry, inode);
 748                 fid = NULL;
 749                 err = 0;
 750         } else {
 751                 /* Not in cached mode. No need to populate inode with stat */
 752                 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0);
 753                 if (IS_ERR(inode)) {
 754                         err = PTR_ERR(inode);
 755                         goto error;
 756                 }
 757                 d_instantiate(dentry, inode);
 758         }
 759
 760 error:
 761         if (fid)
 762                 p9_client_clunk(fid);
 763
 764         return err;
 765 }
 766
 767 /**
 768  * v9fs_vfs_link_dotl - create a hardlink for dotl
 769  * @old_dentry: dentry for file to link to
 770  * @dir: inode destination for new link
 771  * @dentry: dentry for link
 772  *
 773  */
 774
 775 static int
 776 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
 777                 struct dentry *dentry)
 778 {
 779         int err;
 780         char *name;
 781         struct dentry *dir_dentry;
 782         struct p9_fid *dfid, *oldfid;
 783         struct v9fs_session_info *v9ses;
 784
 785         p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %s, new_name: %s\n",
 786                  dir->i_ino, old_dentry->d_name.name, dentry->d_name.name);
 787
 788         v9ses = v9fs_inode2v9ses(dir);
 789         dir_dentry = dentry->d_parent;
 790         dfid = v9fs_fid_lookup(dir_dentry);
 791         if (IS_ERR(dfid))
 792                 return PTR_ERR(dfid);
 793
 794         oldfid = v9fs_fid_lookup(old_dentry);
 795         if (IS_ERR(oldfid))
 796                 return PTR_ERR(oldfid);
 797
 798         name = (char *) dentry->d_name.name;
 799
 800         err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name);
 801
 802         if (err < 0) {
 803                 p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
 804                 return err;
 805         }
 806
 807         v9fs_invalidate_inode_attr(dir);
 808         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 809                 /* Get the latest stat info from server. */
 810                 struct p9_fid *fid;
 811                 fid = v9fs_fid_lookup(old_dentry);
 812                 if (IS_ERR(fid))
 813                         return PTR_ERR(fid);
 814
 815                 v9fs_refresh_inode_dotl(fid, old_dentry->d_inode);
 816         }
 817         ihold(old_dentry->d_inode);
 818         d_instantiate(dentry, old_dentry->d_inode);
 819
 820         return err;
 821 }
 822
 823 /**
 824  * v9fs_vfs_mknod_dotl - create a special file
 825  * @dir: inode destination for new link
 826  * @dentry: dentry for file
 827  * @mode: mode for creation
 828  * @rdev: device associated with special file
 829  *
 830  */
 831 static int
 832 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
 833                 dev_t rdev)
 834 {
 835         int err;
 836         kgid_t gid;
 837         char *name;
 838         umode_t mode;
 839         struct v9fs_session_info *v9ses;
 840         struct p9_fid *fid = NULL, *dfid = NULL;
 841         struct inode *inode;
 842         struct p9_qid qid;
 843         struct dentry *dir_dentry;
 844         struct posix_acl *dacl = NULL, *pacl = NULL;
 845
 846         p9_debug(P9_DEBUG_VFS, " %lu,%s mode: %hx MAJOR: %u MINOR: %u\n",
 847                  dir->i_ino, dentry->d_name.name, omode,
 848                  MAJOR(rdev), MINOR(rdev));
 849
 850         if (!new_valid_dev(rdev))
 851                 return -EINVAL;
 852
 853         v9ses = v9fs_inode2v9ses(dir);
 854         dir_dentry = dentry->d_parent;
 855         dfid = v9fs_fid_lookup(dir_dentry);
 856         if (IS_ERR(dfid)) {
 857                 err = PTR_ERR(dfid);
 858                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 859                 dfid = NULL;
 860                 goto error;
 861         }
 862
 863         gid = v9fs_get_fsgid_for_create(dir);
 864         mode = omode;
 865         /* Update mode based on ACL value */
 866         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 867         if (err) {
 868                 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n",
 869                          err);
 870                 goto error;
 871         }
 872         name = (char *) dentry->d_name.name;
 873
 874         err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
 875         if (err < 0)
 876                 goto error;
 877
 878         v9fs_invalidate_inode_attr(dir);
 879         fid = p9_client_walk(dfid, 1, &name, 1);
 880         if (IS_ERR(fid)) {
 881                 err = PTR_ERR(fid);
 882                 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 883                          err);
 884                 fid = NULL;
 885                 goto error;
 886         }
 887
 888         /* instantiate inode and assign the unopened fid to the dentry */
 889         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 890                 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 891                 if (IS_ERR(inode)) {
 892                         err = PTR_ERR(inode);
 893                         p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
 894                                  err);
 895                         goto error;
 896                 }
 897                 v9fs_set_create_acl(inode, fid, dacl, pacl);
 898                 v9fs_fid_add(dentry, fid);
 899                 d_instantiate(dentry, inode);
 900                 fid = NULL;
 901                 err = 0;
 902         } else {
 903                 /*
 904                  * Not in cached mode. No need to populate inode with stat.
 905                  * socket syscall returns a fd, so we need instantiate
 906                  */
 907                 inode = v9fs_get_inode(dir->i_sb, mode, rdev);
 908                 if (IS_ERR(inode)) {
 909                         err = PTR_ERR(inode);
 910                         goto error;
 911                 }
 912                 v9fs_set_create_acl(inode, fid, dacl, pacl);
 913                 d_instantiate(dentry, inode);
 914         }
 915 error:
 916         if (fid)
 917                 p9_client_clunk(fid);
 918         v9fs_put_acl(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 };