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         umode_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)
 275                 flags = nd->intent.open.flags;
 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_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%x\n",
 287                  name, flags, omode);
 288
 289         dfid = v9fs_fid_lookup(dentry->d_parent);
 290         if (IS_ERR(dfid)) {
 291                 err = PTR_ERR(dfid);
 292                 p9_debug(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_debug(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_debug(P9_DEBUG_VFS, "Failed to get acl values in creat %d\n",
 311                          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_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in creat %d\n",
 318                          err);
 319                 goto error;
 320         }
 321         v9fs_invalidate_inode_attr(dir);
 322
 323         /* instantiate inode and assign the unopened fid to the dentry */
 324         fid = p9_client_walk(dfid, 1, &name, 1);
 325         if (IS_ERR(fid)) {
 326                 err = PTR_ERR(fid);
 327                 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
 328                 fid = NULL;
 329                 goto error;
 330         }
 331         inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 332         if (IS_ERR(inode)) {
 333                 err = PTR_ERR(inode);
 334                 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err);
 335                 goto error;
 336         }
 337         err = v9fs_fid_add(dentry, fid);
 338         if (err < 0)
 339                 goto error;
 340         d_instantiate(dentry, inode);
 341
 342         /* Now set the ACL based on the default value */
 343         v9fs_set_create_acl(dentry, &dacl, &pacl);
 344
 345         v9inode = V9FS_I(inode);
 346         mutex_lock(&v9inode->v_mutex);
 347         if (v9ses->cache && !v9inode->writeback_fid &&
 348             ((flags & O_ACCMODE) != O_RDONLY)) {
 349                 /*
 350                  * clone a fid and add it to writeback_fid
 351                  * we do it during open time instead of
 352                  * page dirty time via write_begin/page_mkwrite
 353                  * because we want write after unlink usecase
 354                  * to work.
 355                  */
 356                 inode_fid = v9fs_writeback_fid(dentry);
 357                 if (IS_ERR(inode_fid)) {
 358                         err = PTR_ERR(inode_fid);
 359                         mutex_unlock(&v9inode->v_mutex);
 360                         goto err_clunk_old_fid;
 361                 }
 362                 v9inode->writeback_fid = (void *) inode_fid;
 363         }
 364         mutex_unlock(&v9inode->v_mutex);
 365         /* Since we are opening a file, assign the open fid to the file */
 366         filp = lookup_instantiate_filp(nd, dentry, generic_file_open);
 367         if (IS_ERR(filp)) {
 368                 err = PTR_ERR(filp);
 369                 goto err_clunk_old_fid;
 370         }
 371         filp->private_data = ofid;
 372 #ifdef CONFIG_9P_FSCACHE
 373         if (v9ses->cache)
 374                 v9fs_cache_inode_set_cookie(inode, filp);
 375 #endif
 376         return 0;
 377
 378 error:
 379         if (fid)
 380                 p9_client_clunk(fid);
 381 err_clunk_old_fid:
 382         if (ofid)
 383                 p9_client_clunk(ofid);
 384         v9fs_set_create_acl(NULL, &dacl, &pacl);
 385         return err;
 386 }
 387
 388 /**
 389  * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
 390  * @dir:  inode that is being unlinked
 391  * @dentry: dentry that is being unlinked
 392  * @mode: mode for new directory
 393  *
 394  */
 395
 396 static int v9fs_vfs_mkdir_dotl(struct inode *dir,
 397                                struct dentry *dentry, int omode)
 398 {
 399         int err;
 400         struct v9fs_session_info *v9ses;
 401         struct p9_fid *fid = NULL, *dfid = NULL;
 402         gid_t gid;
 403         char *name;
 404         umode_t mode;
 405         struct inode *inode;
 406         struct p9_qid qid;
 407         struct dentry *dir_dentry;
 408         struct posix_acl *dacl = NULL, *pacl = NULL;
 409
 410         p9_debug(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
 411         err = 0;
 412         v9ses = v9fs_inode2v9ses(dir);
 413
 414         omode |= S_IFDIR;
 415         if (dir->i_mode & S_ISGID)
 416                 omode |= S_ISGID;
 417
 418         dir_dentry = v9fs_dentry_from_dir_inode(dir);
 419         dfid = v9fs_fid_lookup(dir_dentry);
 420         if (IS_ERR(dfid)) {
 421                 err = PTR_ERR(dfid);
 422                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 423                 dfid = NULL;
 424                 goto error;
 425         }
 426
 427         gid = v9fs_get_fsgid_for_create(dir);
 428         mode = omode;
 429         /* Update mode based on ACL value */
 430         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 431         if (err) {
 432                 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n",
 433                          err);
 434                 goto error;
 435         }
 436         name = (char *) dentry->d_name.name;
 437         err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
 438         if (err < 0)
 439                 goto error;
 440
 441         /* instantiate inode and assign the unopened fid to the dentry */
 442         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 443                 fid = p9_client_walk(dfid, 1, &name, 1);
 444                 if (IS_ERR(fid)) {
 445                         err = PTR_ERR(fid);
 446                         p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 447                                  err);
 448                         fid = NULL;
 449                         goto error;
 450                 }
 451
 452                 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 453                 if (IS_ERR(inode)) {
 454                         err = PTR_ERR(inode);
 455                         p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
 456                                  err);
 457                         goto error;
 458                 }
 459                 err = v9fs_fid_add(dentry, fid);
 460                 if (err < 0)
 461                         goto error;
 462                 d_instantiate(dentry, inode);
 463                 fid = NULL;
 464         } else {
 465                 /*
 466                  * Not in cached mode. No need to populate
 467                  * inode with stat. We need to get an inode
 468                  * so that we can set the acl with dentry
 469                  */
 470                 inode = v9fs_get_inode(dir->i_sb, mode, 0);
 471                 if (IS_ERR(inode)) {
 472                         err = PTR_ERR(inode);
 473                         goto error;
 474                 }
 475                 d_instantiate(dentry, inode);
 476         }
 477         /* Now set the ACL based on the default value */
 478         v9fs_set_create_acl(dentry, &dacl, &pacl);
 479         inc_nlink(dir);
 480         v9fs_invalidate_inode_attr(dir);
 481 error:
 482         if (fid)
 483                 p9_client_clunk(fid);
 484         v9fs_set_create_acl(NULL, &dacl, &pacl);
 485         return err;
 486 }
 487
 488 static int
 489 v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry,
 490                  struct kstat *stat)
 491 {
 492         int err;
 493         struct v9fs_session_info *v9ses;
 494         struct p9_fid *fid;
 495         struct p9_stat_dotl *st;
 496
 497         p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
 498         err = -EPERM;
 499         v9ses = v9fs_dentry2v9ses(dentry);
 500         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 501                 generic_fillattr(dentry->d_inode, stat);
 502                 return 0;
 503         }
 504         fid = v9fs_fid_lookup(dentry);
 505         if (IS_ERR(fid))
 506                 return PTR_ERR(fid);
 507
 508         /* Ask for all the fields in stat structure. Server will return
 509          * whatever it supports
 510          */
 511
 512         st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
 513         if (IS_ERR(st))
 514                 return PTR_ERR(st);
 515
 516         v9fs_stat2inode_dotl(st, dentry->d_inode);
 517         generic_fillattr(dentry->d_inode, stat);
 518         /* Change block size to what the server returned */
 519         stat->blksize = st->st_blksize;
 520
 521         kfree(st);
 522         return 0;
 523 }
 524
 525 /**
 526  * v9fs_vfs_setattr_dotl - set file metadata
 527  * @dentry: file whose metadata to set
 528  * @iattr: metadata assignment structure
 529  *
 530  */
 531
 532 int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
 533 {
 534         int retval;
 535         struct v9fs_session_info *v9ses;
 536         struct p9_fid *fid;
 537         struct p9_iattr_dotl p9attr;
 538
 539         p9_debug(P9_DEBUG_VFS, "\n");
 540
 541         retval = inode_change_ok(dentry->d_inode, iattr);
 542         if (retval)
 543                 return retval;
 544
 545         p9attr.valid = iattr->ia_valid;
 546         p9attr.mode = iattr->ia_mode;
 547         p9attr.uid = iattr->ia_uid;
 548         p9attr.gid = iattr->ia_gid;
 549         p9attr.size = iattr->ia_size;
 550         p9attr.atime_sec = iattr->ia_atime.tv_sec;
 551         p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
 552         p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
 553         p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
 554
 555         retval = -EPERM;
 556         v9ses = v9fs_dentry2v9ses(dentry);
 557         fid = v9fs_fid_lookup(dentry);
 558         if (IS_ERR(fid))
 559                 return PTR_ERR(fid);
 560
 561         /* Write all dirty data */
 562         if (S_ISREG(dentry->d_inode->i_mode))
 563                 filemap_write_and_wait(dentry->d_inode->i_mapping);
 564
 565         retval = p9_client_setattr(fid, &p9attr);
 566         if (retval < 0)
 567                 return retval;
 568
 569         if ((iattr->ia_valid & ATTR_SIZE) &&
 570             iattr->ia_size != i_size_read(dentry->d_inode))
 571                 truncate_setsize(dentry->d_inode, iattr->ia_size);
 572
 573         v9fs_invalidate_inode_attr(dentry->d_inode);
 574         setattr_copy(dentry->d_inode, iattr);
 575         mark_inode_dirty(dentry->d_inode);
 576         if (iattr->ia_valid & ATTR_MODE) {
 577                 /* We also want to update ACL when we update mode bits */
 578                 retval = v9fs_acl_chmod(dentry);
 579                 if (retval < 0)
 580                         return retval;
 581         }
 582         return 0;
 583 }
 584
 585 /**
 586  * v9fs_stat2inode_dotl - populate an inode structure with stat info
 587  * @stat: stat structure
 588  * @inode: inode to populate
 589  * @sb: superblock of filesystem
 590  *
 591  */
 592
 593 void
 594 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode)
 595 {
 596         mode_t mode;
 597         struct v9fs_inode *v9inode = V9FS_I(inode);
 598
 599         if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
 600                 inode->i_atime.tv_sec = stat->st_atime_sec;
 601                 inode->i_atime.tv_nsec = stat->st_atime_nsec;
 602                 inode->i_mtime.tv_sec = stat->st_mtime_sec;
 603                 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
 604                 inode->i_ctime.tv_sec = stat->st_ctime_sec;
 605                 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
 606                 inode->i_uid = stat->st_uid;
 607                 inode->i_gid = stat->st_gid;
 608                 set_nlink(inode, stat->st_nlink);
 609
 610                 mode = stat->st_mode & S_IALLUGO;
 611                 mode |= inode->i_mode & ~S_IALLUGO;
 612                 inode->i_mode = mode;
 613
 614                 i_size_write(inode, stat->st_size);
 615                 inode->i_blocks = stat->st_blocks;
 616         } else {
 617                 if (stat->st_result_mask & P9_STATS_ATIME) {
 618                         inode->i_atime.tv_sec = stat->st_atime_sec;
 619                         inode->i_atime.tv_nsec = stat->st_atime_nsec;
 620                 }
 621                 if (stat->st_result_mask & P9_STATS_MTIME) {
 622                         inode->i_mtime.tv_sec = stat->st_mtime_sec;
 623                         inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
 624                 }
 625                 if (stat->st_result_mask & P9_STATS_CTIME) {
 626                         inode->i_ctime.tv_sec = stat->st_ctime_sec;
 627                         inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
 628                 }
 629                 if (stat->st_result_mask & P9_STATS_UID)
 630                         inode->i_uid = stat->st_uid;
 631                 if (stat->st_result_mask & P9_STATS_GID)
 632                         inode->i_gid = stat->st_gid;
 633                 if (stat->st_result_mask & P9_STATS_NLINK)
 634                         set_nlink(inode, stat->st_nlink);
 635                 if (stat->st_result_mask & P9_STATS_MODE) {
 636                         inode->i_mode = stat->st_mode;
 637                         if ((S_ISBLK(inode->i_mode)) ||
 638                                                 (S_ISCHR(inode->i_mode)))
 639                                 init_special_inode(inode, inode->i_mode,
 640                                                                 inode->i_rdev);
 641                 }
 642                 if (stat->st_result_mask & P9_STATS_RDEV)
 643                         inode->i_rdev = new_decode_dev(stat->st_rdev);
 644                 if (stat->st_result_mask & P9_STATS_SIZE)
 645                         i_size_write(inode, stat->st_size);
 646                 if (stat->st_result_mask & P9_STATS_BLOCKS)
 647                         inode->i_blocks = stat->st_blocks;
 648         }
 649         if (stat->st_result_mask & P9_STATS_GEN)
 650                 inode->i_generation = stat->st_gen;
 651
 652         /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
 653          * because the inode structure does not have fields for them.
 654          */
 655         v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
 656 }
 657
 658 static int
 659 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
 660                 const char *symname)
 661 {
 662         int err;
 663         gid_t gid;
 664         char *name;
 665         struct p9_qid qid;
 666         struct inode *inode;
 667         struct p9_fid *dfid;
 668         struct p9_fid *fid = NULL;
 669         struct v9fs_session_info *v9ses;
 670
 671         name = (char *) dentry->d_name.name;
 672         p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname);
 673         v9ses = v9fs_inode2v9ses(dir);
 674
 675         dfid = v9fs_fid_lookup(dentry->d_parent);
 676         if (IS_ERR(dfid)) {
 677                 err = PTR_ERR(dfid);
 678                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 679                 return err;
 680         }
 681
 682         gid = v9fs_get_fsgid_for_create(dir);
 683
 684         /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
 685         err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid);
 686
 687         if (err < 0) {
 688                 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
 689                 goto error;
 690         }
 691
 692         v9fs_invalidate_inode_attr(dir);
 693         if (v9ses->cache) {
 694                 /* Now walk from the parent so we can get an unopened fid. */
 695                 fid = p9_client_walk(dfid, 1, &name, 1);
 696                 if (IS_ERR(fid)) {
 697                         err = PTR_ERR(fid);
 698                         p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 699                                  err);
 700                         fid = NULL;
 701                         goto error;
 702                 }
 703
 704                 /* instantiate inode and assign the unopened fid to dentry */
 705                 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 706                 if (IS_ERR(inode)) {
 707                         err = PTR_ERR(inode);
 708                         p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
 709                                  err);
 710                         goto error;
 711                 }
 712                 err = v9fs_fid_add(dentry, fid);
 713                 if (err < 0)
 714                         goto error;
 715                 d_instantiate(dentry, inode);
 716                 fid = NULL;
 717         } else {
 718                 /* Not in cached mode. No need to populate inode with stat */
 719                 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0);
 720                 if (IS_ERR(inode)) {
 721                         err = PTR_ERR(inode);
 722                         goto error;
 723                 }
 724                 d_instantiate(dentry, inode);
 725         }
 726
 727 error:
 728         if (fid)
 729                 p9_client_clunk(fid);
 730
 731         return err;
 732 }
 733
 734 /**
 735  * v9fs_vfs_link_dotl - create a hardlink for dotl
 736  * @old_dentry: dentry for file to link to
 737  * @dir: inode destination for new link
 738  * @dentry: dentry for link
 739  *
 740  */
 741
 742 static int
 743 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
 744                 struct dentry *dentry)
 745 {
 746         int err;
 747         char *name;
 748         struct dentry *dir_dentry;
 749         struct p9_fid *dfid, *oldfid;
 750         struct v9fs_session_info *v9ses;
 751
 752         p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %s, new_name: %s\n",
 753                  dir->i_ino, old_dentry->d_name.name, dentry->d_name.name);
 754
 755         v9ses = v9fs_inode2v9ses(dir);
 756         dir_dentry = v9fs_dentry_from_dir_inode(dir);
 757         dfid = v9fs_fid_lookup(dir_dentry);
 758         if (IS_ERR(dfid))
 759                 return PTR_ERR(dfid);
 760
 761         oldfid = v9fs_fid_lookup(old_dentry);
 762         if (IS_ERR(oldfid))
 763                 return PTR_ERR(oldfid);
 764
 765         name = (char *) dentry->d_name.name;
 766
 767         err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name);
 768
 769         if (err < 0) {
 770                 p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
 771                 return err;
 772         }
 773
 774         v9fs_invalidate_inode_attr(dir);
 775         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 776                 /* Get the latest stat info from server. */
 777                 struct p9_fid *fid;
 778                 fid = v9fs_fid_lookup(old_dentry);
 779                 if (IS_ERR(fid))
 780                         return PTR_ERR(fid);
 781
 782                 v9fs_refresh_inode_dotl(fid, old_dentry->d_inode);
 783         }
 784         ihold(old_dentry->d_inode);
 785         d_instantiate(dentry, old_dentry->d_inode);
 786
 787         return err;
 788 }
 789
 790 /**
 791  * v9fs_vfs_mknod_dotl - create a special file
 792  * @dir: inode destination for new link
 793  * @dentry: dentry for file
 794  * @mode: mode for creation
 795  * @rdev: device associated with special file
 796  *
 797  */
 798 static int
 799 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int omode,
 800                 dev_t rdev)
 801 {
 802         int err;
 803         gid_t gid;
 804         char *name;
 805         umode_t mode;
 806         struct v9fs_session_info *v9ses;
 807         struct p9_fid *fid = NULL, *dfid = NULL;
 808         struct inode *inode;
 809         struct p9_qid qid;
 810         struct dentry *dir_dentry;
 811         struct posix_acl *dacl = NULL, *pacl = NULL;
 812
 813         p9_debug(P9_DEBUG_VFS, " %lu,%s mode: %x MAJOR: %u MINOR: %u\n",
 814                  dir->i_ino, dentry->d_name.name, omode,
 815                  MAJOR(rdev), MINOR(rdev));
 816
 817         if (!new_valid_dev(rdev))
 818                 return -EINVAL;
 819
 820         v9ses = v9fs_inode2v9ses(dir);
 821         dir_dentry = v9fs_dentry_from_dir_inode(dir);
 822         dfid = v9fs_fid_lookup(dir_dentry);
 823         if (IS_ERR(dfid)) {
 824                 err = PTR_ERR(dfid);
 825                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 826                 dfid = NULL;
 827                 goto error;
 828         }
 829
 830         gid = v9fs_get_fsgid_for_create(dir);
 831         mode = omode;
 832         /* Update mode based on ACL value */
 833         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 834         if (err) {
 835                 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n",
 836                          err);
 837                 goto error;
 838         }
 839         name = (char *) dentry->d_name.name;
 840
 841         err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
 842         if (err < 0)
 843                 goto error;
 844
 845         v9fs_invalidate_inode_attr(dir);
 846         /* instantiate inode and assign the unopened fid to the dentry */
 847         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 848                 fid = p9_client_walk(dfid, 1, &name, 1);
 849                 if (IS_ERR(fid)) {
 850                         err = PTR_ERR(fid);
 851                         p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 852                                  err);
 853                         fid = NULL;
 854                         goto error;
 855                 }
 856
 857                 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 858                 if (IS_ERR(inode)) {
 859                         err = PTR_ERR(inode);
 860                         p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
 861                                  err);
 862                         goto error;
 863                 }
 864                 err = v9fs_fid_add(dentry, fid);
 865                 if (err < 0)
 866                         goto error;
 867                 d_instantiate(dentry, inode);
 868                 fid = NULL;
 869         } else {
 870                 /*
 871                  * Not in cached mode. No need to populate inode with stat.
 872                  * socket syscall returns a fd, so we need instantiate
 873                  */
 874                 inode = v9fs_get_inode(dir->i_sb, mode, rdev);
 875                 if (IS_ERR(inode)) {
 876                         err = PTR_ERR(inode);
 877                         goto error;
 878                 }
 879                 d_instantiate(dentry, inode);
 880         }
 881         /* Now set the ACL based on the default value */
 882         v9fs_set_create_acl(dentry, &dacl, &pacl);
 883 error:
 884         if (fid)
 885                 p9_client_clunk(fid);
 886         v9fs_set_create_acl(NULL, &dacl, &pacl);
 887         return err;
 888 }
 889
 890 /**
 891  * v9fs_vfs_follow_link_dotl - follow a symlink path
 892  * @dentry: dentry for symlink
 893  * @nd: nameidata
 894  *
 895  */
 896
 897 static void *
 898 v9fs_vfs_follow_link_dotl(struct dentry *dentry, struct nameidata *nd)
 899 {
 900         int retval;
 901         struct p9_fid *fid;
 902         char *link = __getname();
 903         char *target;
 904
 905         p9_debug(P9_DEBUG_VFS, "%s\n", dentry->d_name.name);
 906
 907         if (!link) {
 908                 link = ERR_PTR(-ENOMEM);
 909                 goto ndset;
 910         }
 911         fid = v9fs_fid_lookup(dentry);
 912         if (IS_ERR(fid)) {
 913                 __putname(link);
 914                 link = ERR_CAST(fid);
 915                 goto ndset;
 916         }
 917         retval = p9_client_readlink(fid, &target);
 918         if (!retval) {
 919                 strcpy(link, target);
 920                 kfree(target);
 921                 goto ndset;
 922         }
 923         __putname(link);
 924         link = ERR_PTR(retval);
 925 ndset:
 926         nd_set_link(nd, link);
 927         return NULL;
 928 }
 929
 930 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
 931 {
 932         loff_t i_size;
 933         struct p9_stat_dotl *st;
 934         struct v9fs_session_info *v9ses;
 935
 936         v9ses = v9fs_inode2v9ses(inode);
 937         st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
 938         if (IS_ERR(st))
 939                 return PTR_ERR(st);
 940         /*
 941          * Don't update inode if the file type is different
 942          */
 943         if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
 944                 goto out;
 945
 946         spin_lock(&inode->i_lock);
 947         /*
 948          * We don't want to refresh inode->i_size,
 949          * because we may have cached data
 950          */
 951         i_size = inode->i_size;
 952         v9fs_stat2inode_dotl(st, inode);
 953         if (v9ses->cache)
 954                 inode->i_size = i_size;
 955         spin_unlock(&inode->i_lock);
 956 out:
 957         kfree(st);
 958         return 0;
 959 }
 960
 961 const struct inode_operations v9fs_dir_inode_operations_dotl = {
 962         .create = v9fs_vfs_create_dotl,
 963         .lookup = v9fs_vfs_lookup,
 964         .link = v9fs_vfs_link_dotl,
 965         .symlink = v9fs_vfs_symlink_dotl,
 966         .unlink = v9fs_vfs_unlink,
 967         .mkdir = v9fs_vfs_mkdir_dotl,
 968         .rmdir = v9fs_vfs_rmdir,
 969         .mknod = v9fs_vfs_mknod_dotl,
 970         .rename = v9fs_vfs_rename,
 971         .getattr = v9fs_vfs_getattr_dotl,
 972         .setattr = v9fs_vfs_setattr_dotl,
 973         .setxattr = generic_setxattr,
 974         .getxattr = generic_getxattr,
 975         .removexattr = generic_removexattr,
 976         .listxattr = v9fs_listxattr,
 977         .get_acl = v9fs_iop_get_acl,
 978 };
 979
 980 const struct inode_operations v9fs_file_inode_operations_dotl = {
 981         .getattr = v9fs_vfs_getattr_dotl,
 982         .setattr = v9fs_vfs_setattr_dotl,
 983         .setxattr = generic_setxattr,
 984         .getxattr = generic_getxattr,
 985         .removexattr = generic_removexattr,
 986         .listxattr = v9fs_listxattr,
 987         .get_acl = v9fs_iop_get_acl,
 988 };
 989
 990 const struct inode_operations v9fs_symlink_inode_operations_dotl = {
 991         .readlink = generic_readlink,
 992         .follow_link = v9fs_vfs_follow_link_dotl,
 993         .put_link = v9fs_vfs_put_link,
 994         .getattr = v9fs_vfs_getattr_dotl,
 995         .setattr = v9fs_vfs_setattr_dotl,
 996         .setxattr = generic_setxattr,
 997         .getxattr = generic_getxattr,
 998         .removexattr = generic_removexattr,
 999         .listxattr = v9fs_listxattr,
1000 };