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, int 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 /**
  72  * v9fs_dentry_from_dir_inode - helper function to get the dentry from
  73  * dir inode.
  74  *
  75  */
  76
  77 static struct dentry *v9fs_dentry_from_dir_inode(struct inode *inode)
  78 {
  79         struct dentry *dentry;
  80
  81         spin_lock(&inode->i_lock);
  82         /* Directory should have only one entry. */
  83         BUG_ON(S_ISDIR(inode->i_mode) && !list_is_singular(&inode->i_dentry));
  84         dentry = list_entry(inode->i_dentry.next, struct dentry, d_alias);
  85         spin_unlock(&inode->i_lock);
  86         return dentry;
  87 }
  88
  89 static int v9fs_test_inode_dotl(struct inode *inode, void *data)
  90 {
  91         struct v9fs_inode *v9inode = V9FS_I(inode);
  92         struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
  93
  94         /* don't match inode of different type */
  95         if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
  96                 return 0;
  97
  98         if (inode->i_generation != st->st_gen)
  99                 return 0;
 100
 101         /* compare qid details */
 102         if (memcmp(&v9inode->qid.version,
 103                    &st->qid.version, sizeof(v9inode->qid.version)))
 104                 return 0;
 105
 106         if (v9inode->qid.type != st->qid.type)
 107                 return 0;
 108         return 1;
 109 }
 110
 111 /* Always get a new inode */
 112 static int v9fs_test_new_inode_dotl(struct inode *inode, void *data)
 113 {
 114         return 0;
 115 }
 116
 117 static int v9fs_set_inode_dotl(struct inode *inode,  void *data)
 118 {
 119         struct v9fs_inode *v9inode = V9FS_I(inode);
 120         struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
 121
 122         memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
 123         inode->i_generation = st->st_gen;
 124         return 0;
 125 }
 126
 127 static struct inode *v9fs_qid_iget_dotl(struct super_block *sb,
 128                                         struct p9_qid *qid,
 129                                         struct p9_fid *fid,
 130                                         struct p9_stat_dotl *st,
 131                                         int new)
 132 {
 133         int retval;
 134         unsigned long i_ino;
 135         struct inode *inode;
 136         struct v9fs_session_info *v9ses = sb->s_fs_info;
 137         int (*test)(struct inode *, void *);
 138
 139         if (new)
 140                 test = v9fs_test_new_inode_dotl;
 141         else
 142                 test = v9fs_test_inode_dotl;
 143
 144         i_ino = v9fs_qid2ino(qid);
 145         inode = iget5_locked(sb, i_ino, test, v9fs_set_inode_dotl, st);
 146         if (!inode)
 147                 return ERR_PTR(-ENOMEM);
 148         if (!(inode->i_state & I_NEW))
 149                 return inode;
 150         /*
 151          * initialize the inode with the stat info
 152          * FIXME!! we may need support for stale inodes
 153          * later.
 154          */
 155         inode->i_ino = i_ino;
 156         retval = v9fs_init_inode(v9ses, inode,
 157                                  st->st_mode, new_decode_dev(st->st_rdev));
 158         if (retval)
 159                 goto error;
 160
 161         v9fs_stat2inode_dotl(st, inode);
 162 #ifdef CONFIG_9P_FSCACHE
 163         v9fs_cache_inode_get_cookie(inode);
 164 #endif
 165         retval = v9fs_get_acl(inode, fid);
 166         if (retval)
 167                 goto error;
 168
 169         unlock_new_inode(inode);
 170         return inode;
 171 error:
 172         unlock_new_inode(inode);
 173         iput(inode);
 174         return ERR_PTR(retval);
 175
 176 }
 177
 178 struct inode *
 179 v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
 180                          struct super_block *sb, int new)
 181 {
 182         struct p9_stat_dotl *st;
 183         struct inode *inode = NULL;
 184
 185         st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN);
 186         if (IS_ERR(st))
 187                 return ERR_CAST(st);
 188
 189         inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new);
 190         kfree(st);
 191         return inode;
 192 }
 193
 194 struct dotl_openflag_map {
 195         int open_flag;
 196         int dotl_flag;
 197 };
 198
 199 static int v9fs_mapped_dotl_flags(int flags)
 200 {
 201         int i;
 202         int rflags = 0;
 203         struct dotl_openflag_map dotl_oflag_map[] = {
 204                 { O_CREAT,      P9_DOTL_CREATE },
 205                 { O_EXCL,       P9_DOTL_EXCL },
 206                 { O_NOCTTY,     P9_DOTL_NOCTTY },
 207                 { O_TRUNC,      P9_DOTL_TRUNC },
 208                 { O_APPEND,     P9_DOTL_APPEND },
 209                 { O_NONBLOCK,   P9_DOTL_NONBLOCK },
 210                 { O_DSYNC,      P9_DOTL_DSYNC },
 211                 { FASYNC,       P9_DOTL_FASYNC },
 212                 { O_DIRECT,     P9_DOTL_DIRECT },
 213                 { O_LARGEFILE,  P9_DOTL_LARGEFILE },
 214                 { O_DIRECTORY,  P9_DOTL_DIRECTORY },
 215                 { O_NOFOLLOW,   P9_DOTL_NOFOLLOW },
 216                 { O_NOATIME,    P9_DOTL_NOATIME },
 217                 { O_CLOEXEC,    P9_DOTL_CLOEXEC },
 218                 { O_SYNC,       P9_DOTL_SYNC},
 219         };
 220         for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) {
 221                 if (flags & dotl_oflag_map[i].open_flag)
 222                         rflags |= dotl_oflag_map[i].dotl_flag;
 223         }
 224         return rflags;
 225 }
 226
 227 /**
 228  * v9fs_open_to_dotl_flags- convert Linux specific open flags to
 229  * plan 9 open flag.
 230  * @flags: flags to convert
 231  */
 232 int v9fs_open_to_dotl_flags(int flags)
 233 {
 234         int rflags = 0;
 235
 236         /*
 237          * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
 238          * and P9_DOTL_NOACCESS
 239          */
 240         rflags |= flags & O_ACCMODE;
 241         rflags |= v9fs_mapped_dotl_flags(flags);
 242
 243         return rflags;
 244 }
 245
 246 /**
 247  * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
 248  * @dir: directory inode that is being created
 249  * @dentry:  dentry that is being deleted
 250  * @mode: create permissions
 251  * @nd: path information
 252  *
 253  */
 254
 255 static int
 256 v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, int omode,
 257                 struct nameidata *nd)
 258 {
 259         int err = 0;
 260         gid_t gid;
 261         int flags;
 262         mode_t mode;
 263         char *name = NULL;
 264         struct file *filp;
 265         struct p9_qid qid;
 266         struct inode *inode;
 267         struct p9_fid *fid = NULL;
 268         struct v9fs_inode *v9inode;
 269         struct p9_fid *dfid, *ofid, *inode_fid;
 270         struct v9fs_session_info *v9ses;
 271         struct posix_acl *pacl = NULL, *dacl = NULL;
 272
 273         v9ses = v9fs_inode2v9ses(dir);
 274         if (nd && nd->flags & LOOKUP_OPEN)
 275                 flags = nd->intent.open.flags - 1;
 276         else {
 277                 /*
 278                  * create call without LOOKUP_OPEN is due
 279                  * to mknod of regular files. So use mknod
 280                  * operation.
 281                  */
 282                 return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
 283         }
 284
 285         name = (char *) dentry->d_name.name;
 286         P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_create_dotl: name:%s flags:0x%x "
 287                         "mode:0x%x\n", name, flags, omode);
 288
 289         dfid = v9fs_fid_lookup(dentry->d_parent);
 290         if (IS_ERR(dfid)) {
 291                 err = PTR_ERR(dfid);
 292                 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 293                 return err;
 294         }
 295
 296         /* clone a fid to use for creation */
 297         ofid = p9_client_walk(dfid, 0, NULL, 1);
 298         if (IS_ERR(ofid)) {
 299                 err = PTR_ERR(ofid);
 300                 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
 301                 return err;
 302         }
 303
 304         gid = v9fs_get_fsgid_for_create(dir);
 305
 306         mode = omode;
 307         /* Update mode based on ACL value */
 308         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 309         if (err) {
 310                 P9_DPRINTK(P9_DEBUG_VFS,
 311                            "Failed to get acl values in creat %d\n", err);
 312                 goto error;
 313         }
 314         err = p9_client_create_dotl(ofid, name, v9fs_open_to_dotl_flags(flags),
 315                                     mode, gid, &qid);
 316         if (err < 0) {
 317                 P9_DPRINTK(P9_DEBUG_VFS,
 318                                 "p9_client_open_dotl failed in creat %d\n",
 319                                 err);
 320                 goto error;
 321         }
 322         v9fs_invalidate_inode_attr(dir);
 323
 324         /* instantiate inode and assign the unopened fid to the dentry */
 325         fid = p9_client_walk(dfid, 1, &name, 1);
 326         if (IS_ERR(fid)) {
 327                 err = PTR_ERR(fid);
 328                 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
 329                 fid = NULL;
 330                 goto error;
 331         }
 332         inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 333         if (IS_ERR(inode)) {
 334                 err = PTR_ERR(inode);
 335                 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err);
 336                 goto error;
 337         }
 338         err = v9fs_fid_add(dentry, fid);
 339         if (err < 0)
 340                 goto error;
 341         d_instantiate(dentry, inode);
 342
 343         /* Now set the ACL based on the default value */
 344         v9fs_set_create_acl(dentry, &dacl, &pacl);
 345
 346         v9inode = V9FS_I(inode);
 347         mutex_lock(&v9inode->v_mutex);
 348         if (v9ses->cache && !v9inode->writeback_fid &&
 349             ((flags & O_ACCMODE) != O_RDONLY)) {
 350                 /*
 351                  * clone a fid and add it to writeback_fid
 352                  * we do it during open time instead of
 353                  * page dirty time via write_begin/page_mkwrite
 354                  * because we want write after unlink usecase
 355                  * to work.
 356                  */
 357                 inode_fid = v9fs_writeback_fid(dentry);
 358                 if (IS_ERR(inode_fid)) {
 359                         err = PTR_ERR(inode_fid);
 360                         mutex_unlock(&v9inode->v_mutex);
 361                         goto err_clunk_old_fid;
 362                 }
 363                 v9inode->writeback_fid = (void *) inode_fid;
 364         }
 365         mutex_unlock(&v9inode->v_mutex);
 366         /* Since we are opening a file, assign the open fid to the file */
 367         filp = lookup_instantiate_filp(nd, dentry, generic_file_open);
 368         if (IS_ERR(filp)) {
 369                 err = PTR_ERR(filp);
 370                 goto err_clunk_old_fid;
 371         }
 372         filp->private_data = ofid;
 373 #ifdef CONFIG_9P_FSCACHE
 374         if (v9ses->cache)
 375                 v9fs_cache_inode_set_cookie(inode, filp);
 376 #endif
 377         return 0;
 378
 379 error:
 380         if (fid)
 381                 p9_client_clunk(fid);
 382 err_clunk_old_fid:
 383         if (ofid)
 384                 p9_client_clunk(ofid);
 385         v9fs_set_create_acl(NULL, &dacl, &pacl);
 386         return err;
 387 }
 388
 389 /**
 390  * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
 391  * @dir:  inode that is being unlinked
 392  * @dentry: dentry that is being unlinked
 393  * @mode: mode for new directory
 394  *
 395  */
 396
 397 static int v9fs_vfs_mkdir_dotl(struct inode *dir,
 398                                struct dentry *dentry, int omode)
 399 {
 400         int err;
 401         struct v9fs_session_info *v9ses;
 402         struct p9_fid *fid = NULL, *dfid = NULL;
 403         gid_t gid;
 404         char *name;
 405         mode_t mode;
 406         struct inode *inode;
 407         struct p9_qid qid;
 408         struct dentry *dir_dentry;
 409         struct posix_acl *dacl = NULL, *pacl = NULL;
 410
 411         P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
 412         err = 0;
 413         v9ses = v9fs_inode2v9ses(dir);
 414
 415         omode |= S_IFDIR;
 416         if (dir->i_mode & S_ISGID)
 417                 omode |= S_ISGID;
 418
 419         dir_dentry = v9fs_dentry_from_dir_inode(dir);
 420         dfid = v9fs_fid_lookup(dir_dentry);
 421         if (IS_ERR(dfid)) {
 422                 err = PTR_ERR(dfid);
 423                 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 424                 dfid = NULL;
 425                 goto error;
 426         }
 427
 428         gid = v9fs_get_fsgid_for_create(dir);
 429         mode = omode;
 430         /* Update mode based on ACL value */
 431         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 432         if (err) {
 433                 P9_DPRINTK(P9_DEBUG_VFS,
 434                            "Failed to get acl values in mkdir %d\n", err);
 435                 goto error;
 436         }
 437         name = (char *) dentry->d_name.name;
 438         err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
 439         if (err < 0)
 440                 goto error;
 441
 442         /* instantiate inode and assign the unopened fid to the dentry */
 443         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 444                 fid = p9_client_walk(dfid, 1, &name, 1);
 445                 if (IS_ERR(fid)) {
 446                         err = PTR_ERR(fid);
 447                         P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 448                                 err);
 449                         fid = NULL;
 450                         goto error;
 451                 }
 452
 453                 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 454                 if (IS_ERR(inode)) {
 455                         err = PTR_ERR(inode);
 456                         P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
 457                                 err);
 458                         goto error;
 459                 }
 460                 err = v9fs_fid_add(dentry, fid);
 461                 if (err < 0)
 462                         goto error;
 463                 d_instantiate(dentry, inode);
 464                 fid = NULL;
 465         } else {
 466                 /*
 467                  * Not in cached mode. No need to populate
 468                  * inode with stat. We need to get an inode
 469                  * so that we can set the acl with dentry
 470                  */
 471                 inode = v9fs_get_inode(dir->i_sb, mode, 0);
 472                 if (IS_ERR(inode)) {
 473                         err = PTR_ERR(inode);
 474                         goto error;
 475                 }
 476                 d_instantiate(dentry, inode);
 477         }
 478         /* Now set the ACL based on the default value */
 479         v9fs_set_create_acl(dentry, &dacl, &pacl);
 480         inc_nlink(dir);
 481         v9fs_invalidate_inode_attr(dir);
 482 error:
 483         if (fid)
 484                 p9_client_clunk(fid);
 485         v9fs_set_create_acl(NULL, &dacl, &pacl);
 486         return err;
 487 }
 488
 489 static int
 490 v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry,
 491                  struct kstat *stat)
 492 {
 493         int err;
 494         struct v9fs_session_info *v9ses;
 495         struct p9_fid *fid;
 496         struct p9_stat_dotl *st;
 497
 498         P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry);
 499         err = -EPERM;
 500         v9ses = v9fs_dentry2v9ses(dentry);
 501         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 502                 generic_fillattr(dentry->d_inode, stat);
 503                 return 0;
 504         }
 505         fid = v9fs_fid_lookup(dentry);
 506         if (IS_ERR(fid))
 507                 return PTR_ERR(fid);
 508
 509         /* Ask for all the fields in stat structure. Server will return
 510          * whatever it supports
 511          */
 512
 513         st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
 514         if (IS_ERR(st))
 515                 return PTR_ERR(st);
 516
 517         v9fs_stat2inode_dotl(st, dentry->d_inode);
 518         generic_fillattr(dentry->d_inode, stat);
 519         /* Change block size to what the server returned */
 520         stat->blksize = st->st_blksize;
 521
 522         kfree(st);
 523         return 0;
 524 }
 525
 526 /**
 527  * v9fs_vfs_setattr_dotl - set file metadata
 528  * @dentry: file whose metadata to set
 529  * @iattr: metadata assignment structure
 530  *
 531  */
 532
 533 int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
 534 {
 535         int retval;
 536         struct v9fs_session_info *v9ses;
 537         struct p9_fid *fid;
 538         struct p9_iattr_dotl p9attr;
 539
 540         P9_DPRINTK(P9_DEBUG_VFS, "\n");
 541
 542         retval = inode_change_ok(dentry->d_inode, iattr);
 543         if (retval)
 544                 return retval;
 545
 546         p9attr.valid = iattr->ia_valid;
 547         p9attr.mode = iattr->ia_mode;
 548         p9attr.uid = iattr->ia_uid;
 549         p9attr.gid = iattr->ia_gid;
 550         p9attr.size = iattr->ia_size;
 551         p9attr.atime_sec = iattr->ia_atime.tv_sec;
 552         p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
 553         p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
 554         p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
 555
 556         retval = -EPERM;
 557         v9ses = v9fs_dentry2v9ses(dentry);
 558         fid = v9fs_fid_lookup(dentry);
 559         if (IS_ERR(fid))
 560                 return PTR_ERR(fid);
 561
 562         /* Write all dirty data */
 563         if (S_ISREG(dentry->d_inode->i_mode))
 564                 filemap_write_and_wait(dentry->d_inode->i_mapping);
 565
 566         retval = p9_client_setattr(fid, &p9attr);
 567         if (retval < 0)
 568                 return retval;
 569
 570         if ((iattr->ia_valid & ATTR_SIZE) &&
 571             iattr->ia_size != i_size_read(dentry->d_inode))
 572                 truncate_setsize(dentry->d_inode, iattr->ia_size);
 573
 574         v9fs_invalidate_inode_attr(dentry->d_inode);
 575         setattr_copy(dentry->d_inode, iattr);
 576         mark_inode_dirty(dentry->d_inode);
 577         if (iattr->ia_valid & ATTR_MODE) {
 578                 /* We also want to update ACL when we update mode bits */
 579                 retval = v9fs_acl_chmod(dentry);
 580                 if (retval < 0)
 581                         return retval;
 582         }
 583         return 0;
 584 }
 585
 586 /**
 587  * v9fs_stat2inode_dotl - populate an inode structure with stat info
 588  * @stat: stat structure
 589  * @inode: inode to populate
 590  * @sb: superblock of filesystem
 591  *
 592  */
 593
 594 void
 595 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode)
 596 {
 597         mode_t mode;
 598         struct v9fs_inode *v9inode = V9FS_I(inode);
 599
 600         if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
 601                 inode->i_atime.tv_sec = stat->st_atime_sec;
 602                 inode->i_atime.tv_nsec = stat->st_atime_nsec;
 603                 inode->i_mtime.tv_sec = stat->st_mtime_sec;
 604                 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
 605                 inode->i_ctime.tv_sec = stat->st_ctime_sec;
 606                 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
 607                 inode->i_uid = stat->st_uid;
 608                 inode->i_gid = stat->st_gid;
 609                 inode->i_nlink = stat->st_nlink;
 610
 611                 mode = stat->st_mode & S_IALLUGO;
 612                 mode |= inode->i_mode & ~S_IALLUGO;
 613                 inode->i_mode = mode;
 614
 615                 i_size_write(inode, stat->st_size);
 616                 inode->i_blocks = stat->st_blocks;
 617         } else {
 618                 if (stat->st_result_mask & P9_STATS_ATIME) {
 619                         inode->i_atime.tv_sec = stat->st_atime_sec;
 620                         inode->i_atime.tv_nsec = stat->st_atime_nsec;
 621                 }
 622                 if (stat->st_result_mask & P9_STATS_MTIME) {
 623                         inode->i_mtime.tv_sec = stat->st_mtime_sec;
 624                         inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
 625                 }
 626                 if (stat->st_result_mask & P9_STATS_CTIME) {
 627                         inode->i_ctime.tv_sec = stat->st_ctime_sec;
 628                         inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
 629                 }
 630                 if (stat->st_result_mask & P9_STATS_UID)
 631                         inode->i_uid = stat->st_uid;
 632                 if (stat->st_result_mask & P9_STATS_GID)
 633                         inode->i_gid = stat->st_gid;
 634                 if (stat->st_result_mask & P9_STATS_NLINK)
 635                         inode->i_nlink = stat->st_nlink;
 636                 if (stat->st_result_mask & P9_STATS_MODE) {
 637                         inode->i_mode = stat->st_mode;
 638                         if ((S_ISBLK(inode->i_mode)) ||
 639                                                 (S_ISCHR(inode->i_mode)))
 640                                 init_special_inode(inode, inode->i_mode,
 641                                                                 inode->i_rdev);
 642                 }
 643                 if (stat->st_result_mask & P9_STATS_RDEV)
 644                         inode->i_rdev = new_decode_dev(stat->st_rdev);
 645                 if (stat->st_result_mask & P9_STATS_SIZE)
 646                         i_size_write(inode, stat->st_size);
 647                 if (stat->st_result_mask & P9_STATS_BLOCKS)
 648                         inode->i_blocks = stat->st_blocks;
 649         }
 650         if (stat->st_result_mask & P9_STATS_GEN)
 651                 inode->i_generation = stat->st_gen;
 652
 653         /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
 654          * because the inode structure does not have fields for them.
 655          */
 656         v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
 657 }
 658
 659 static int
 660 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
 661                 const char *symname)
 662 {
 663         int err;
 664         gid_t gid;
 665         char *name;
 666         struct p9_qid qid;
 667         struct inode *inode;
 668         struct p9_fid *dfid;
 669         struct p9_fid *fid = NULL;
 670         struct v9fs_session_info *v9ses;
 671
 672         name = (char *) dentry->d_name.name;
 673         P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_symlink_dotl : %lu,%s,%s\n",
 674                         dir->i_ino, name, symname);
 675         v9ses = v9fs_inode2v9ses(dir);
 676
 677         dfid = v9fs_fid_lookup(dentry->d_parent);
 678         if (IS_ERR(dfid)) {
 679                 err = PTR_ERR(dfid);
 680                 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 681                 return err;
 682         }
 683
 684         gid = v9fs_get_fsgid_for_create(dir);
 685
 686         /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
 687         err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid);
 688
 689         if (err < 0) {
 690                 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
 691                 goto error;
 692         }
 693
 694         v9fs_invalidate_inode_attr(dir);
 695         if (v9ses->cache) {
 696                 /* Now walk from the parent so we can get an unopened fid. */
 697                 fid = p9_client_walk(dfid, 1, &name, 1);
 698                 if (IS_ERR(fid)) {
 699                         err = PTR_ERR(fid);
 700                         P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 701                                         err);
 702                         fid = NULL;
 703                         goto error;
 704                 }
 705
 706                 /* instantiate inode and assign the unopened fid to dentry */
 707                 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 708                 if (IS_ERR(inode)) {
 709                         err = PTR_ERR(inode);
 710                         P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
 711                                         err);
 712                         goto error;
 713                 }
 714                 err = v9fs_fid_add(dentry, fid);
 715                 if (err < 0)
 716                         goto error;
 717                 d_instantiate(dentry, inode);
 718                 fid = NULL;
 719         } else {
 720                 /* Not in cached mode. No need to populate inode with stat */
 721                 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0);
 722                 if (IS_ERR(inode)) {
 723                         err = PTR_ERR(inode);
 724                         goto error;
 725                 }
 726                 d_instantiate(dentry, inode);
 727         }
 728
 729 error:
 730         if (fid)
 731                 p9_client_clunk(fid);
 732
 733         return err;
 734 }
 735
 736 /**
 737  * v9fs_vfs_link_dotl - create a hardlink for dotl
 738  * @old_dentry: dentry for file to link to
 739  * @dir: inode destination for new link
 740  * @dentry: dentry for link
 741  *
 742  */
 743
 744 static int
 745 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
 746                 struct dentry *dentry)
 747 {
 748         int err;
 749         char *name;
 750         struct dentry *dir_dentry;
 751         struct p9_fid *dfid, *oldfid;
 752         struct v9fs_session_info *v9ses;
 753
 754         P9_DPRINTK(P9_DEBUG_VFS, "dir ino: %lu, old_name: %s, new_name: %s\n",
 755                         dir->i_ino, old_dentry->d_name.name,
 756                         dentry->d_name.name);
 757
 758         v9ses = v9fs_inode2v9ses(dir);
 759         dir_dentry = v9fs_dentry_from_dir_inode(dir);
 760         dfid = v9fs_fid_lookup(dir_dentry);
 761         if (IS_ERR(dfid))
 762                 return PTR_ERR(dfid);
 763
 764         oldfid = v9fs_fid_lookup(old_dentry);
 765         if (IS_ERR(oldfid))
 766                 return PTR_ERR(oldfid);
 767
 768         name = (char *) dentry->d_name.name;
 769
 770         err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name);
 771
 772         if (err < 0) {
 773                 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
 774                 return err;
 775         }
 776
 777         v9fs_invalidate_inode_attr(dir);
 778         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 779                 /* Get the latest stat info from server. */
 780                 struct p9_fid *fid;
 781                 fid = v9fs_fid_lookup(old_dentry);
 782                 if (IS_ERR(fid))
 783                         return PTR_ERR(fid);
 784
 785                 v9fs_refresh_inode_dotl(fid, old_dentry->d_inode);
 786         }
 787         ihold(old_dentry->d_inode);
 788         d_instantiate(dentry, old_dentry->d_inode);
 789
 790         return err;
 791 }
 792
 793 /**
 794  * v9fs_vfs_mknod_dotl - create a special file
 795  * @dir: inode destination for new link
 796  * @dentry: dentry for file
 797  * @mode: mode for creation
 798  * @rdev: device associated with special file
 799  *
 800  */
 801 static int
 802 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int omode,
 803                 dev_t rdev)
 804 {
 805         int err;
 806         gid_t gid;
 807         char *name;
 808         mode_t mode;
 809         struct v9fs_session_info *v9ses;
 810         struct p9_fid *fid = NULL, *dfid = NULL;
 811         struct inode *inode;
 812         struct p9_qid qid;
 813         struct dentry *dir_dentry;
 814         struct posix_acl *dacl = NULL, *pacl = NULL;
 815
 816         P9_DPRINTK(P9_DEBUG_VFS,
 817                 " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
 818                 dentry->d_name.name, omode, MAJOR(rdev), MINOR(rdev));
 819
 820         if (!new_valid_dev(rdev))
 821                 return -EINVAL;
 822
 823         v9ses = v9fs_inode2v9ses(dir);
 824         dir_dentry = v9fs_dentry_from_dir_inode(dir);
 825         dfid = v9fs_fid_lookup(dir_dentry);
 826         if (IS_ERR(dfid)) {
 827                 err = PTR_ERR(dfid);
 828                 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 829                 dfid = NULL;
 830                 goto error;
 831         }
 832
 833         gid = v9fs_get_fsgid_for_create(dir);
 834         mode = omode;
 835         /* Update mode based on ACL value */
 836         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 837         if (err) {
 838                 P9_DPRINTK(P9_DEBUG_VFS,
 839                            "Failed to get acl values in mknod %d\n", err);
 840                 goto error;
 841         }
 842         name = (char *) dentry->d_name.name;
 843
 844         err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
 845         if (err < 0)
 846                 goto error;
 847
 848         v9fs_invalidate_inode_attr(dir);
 849         /* instantiate inode and assign the unopened fid to the dentry */
 850         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 851                 fid = p9_client_walk(dfid, 1, &name, 1);
 852                 if (IS_ERR(fid)) {
 853                         err = PTR_ERR(fid);
 854                         P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 855                                 err);
 856                         fid = NULL;
 857                         goto error;
 858                 }
 859
 860                 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 861                 if (IS_ERR(inode)) {
 862                         err = PTR_ERR(inode);
 863                         P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
 864                                 err);
 865                         goto error;
 866                 }
 867                 err = v9fs_fid_add(dentry, fid);
 868                 if (err < 0)
 869                         goto error;
 870                 d_instantiate(dentry, inode);
 871                 fid = NULL;
 872         } else {
 873                 /*
 874                  * Not in cached mode. No need to populate inode with stat.
 875                  * socket syscall returns a fd, so we need instantiate
 876                  */
 877                 inode = v9fs_get_inode(dir->i_sb, mode, rdev);
 878                 if (IS_ERR(inode)) {
 879                         err = PTR_ERR(inode);
 880                         goto error;
 881                 }
 882                 d_instantiate(dentry, inode);
 883         }
 884         /* Now set the ACL based on the default value */
 885         v9fs_set_create_acl(dentry, &dacl, &pacl);
 886 error:
 887         if (fid)
 888                 p9_client_clunk(fid);
 889         v9fs_set_create_acl(NULL, &dacl, &pacl);
 890         return err;
 891 }
 892
 893 /**
 894  * v9fs_vfs_follow_link_dotl - follow a symlink path
 895  * @dentry: dentry for symlink
 896  * @nd: nameidata
 897  *
 898  */
 899
 900 static void *
 901 v9fs_vfs_follow_link_dotl(struct dentry *dentry, struct nameidata *nd)
 902 {
 903         int retval;
 904         struct p9_fid *fid;
 905         char *link = __getname();
 906         char *target;
 907
 908         P9_DPRINTK(P9_DEBUG_VFS, "%s\n", dentry->d_name.name);
 909
 910         if (!link) {
 911                 link = ERR_PTR(-ENOMEM);
 912                 goto ndset;
 913         }
 914         fid = v9fs_fid_lookup(dentry);
 915         if (IS_ERR(fid)) {
 916                 __putname(link);
 917                 link = ERR_CAST(fid);
 918                 goto ndset;
 919         }
 920         retval = p9_client_readlink(fid, &target);
 921         if (!retval) {
 922                 strcpy(link, target);
 923                 kfree(target);
 924                 goto ndset;
 925         }
 926         __putname(link);
 927         link = ERR_PTR(retval);
 928 ndset:
 929         nd_set_link(nd, link);
 930         return NULL;
 931 }
 932
 933 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
 934 {
 935         loff_t i_size;
 936         struct p9_stat_dotl *st;
 937         struct v9fs_session_info *v9ses;
 938
 939         v9ses = v9fs_inode2v9ses(inode);
 940         st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
 941         if (IS_ERR(st))
 942                 return PTR_ERR(st);
 943         /*
 944          * Don't update inode if the file type is different
 945          */
 946         if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
 947                 goto out;
 948
 949         spin_lock(&inode->i_lock);
 950         /*
 951          * We don't want to refresh inode->i_size,
 952          * because we may have cached data
 953          */
 954         i_size = inode->i_size;
 955         v9fs_stat2inode_dotl(st, inode);
 956         if (v9ses->cache)
 957                 inode->i_size = i_size;
 958         spin_unlock(&inode->i_lock);
 959 out:
 960         kfree(st);
 961         return 0;
 962 }
 963
 964 const struct inode_operations v9fs_dir_inode_operations_dotl = {
 965         .create = v9fs_vfs_create_dotl,
 966         .lookup = v9fs_vfs_lookup,
 967         .link = v9fs_vfs_link_dotl,
 968         .symlink = v9fs_vfs_symlink_dotl,
 969         .unlink = v9fs_vfs_unlink,
 970         .mkdir = v9fs_vfs_mkdir_dotl,
 971         .rmdir = v9fs_vfs_rmdir,
 972         .mknod = v9fs_vfs_mknod_dotl,
 973         .rename = v9fs_vfs_rename,
 974         .getattr = v9fs_vfs_getattr_dotl,
 975         .setattr = v9fs_vfs_setattr_dotl,
 976         .setxattr = generic_setxattr,
 977         .getxattr = generic_getxattr,
 978         .removexattr = generic_removexattr,
 979         .listxattr = v9fs_listxattr,
 980         .check_acl = v9fs_check_acl,
 981 };
 982
 983 const struct inode_operations v9fs_file_inode_operations_dotl = {
 984         .getattr = v9fs_vfs_getattr_dotl,
 985         .setattr = v9fs_vfs_setattr_dotl,
 986         .setxattr = generic_setxattr,
 987         .getxattr = generic_getxattr,
 988         .removexattr = generic_removexattr,
 989         .listxattr = v9fs_listxattr,
 990         .check_acl = v9fs_check_acl,
 991 };
 992
 993 const struct inode_operations v9fs_symlink_inode_operations_dotl = {
 994         .readlink = generic_readlink,
 995         .follow_link = v9fs_vfs_follow_link_dotl,
 996         .put_link = v9fs_vfs_put_link,
 997         .getattr = v9fs_vfs_getattr_dotl,
 998         .setattr = v9fs_vfs_setattr_dotl,
 999         .setxattr = generic_setxattr,
1000         .getxattr = generic_getxattr,
1001         .removexattr = generic_removexattr,
1002         .listxattr = v9fs_listxattr,
1003 };