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 static int v9fs_set_inode_dotl(struct inode *inode,  void *data)
 112 {
 113         struct v9fs_inode *v9inode = V9FS_I(inode);
 114         struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
 115
 116         memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
 117         inode->i_generation = st->st_gen;
 118         return 0;
 119 }
 120
 121 static struct inode *v9fs_qid_iget_dotl(struct super_block *sb,
 122                                         struct p9_qid *qid,
 123                                         struct p9_fid *fid,
 124                                         struct p9_stat_dotl *st)
 125 {
 126         int retval;
 127         unsigned long i_ino;
 128         struct inode *inode;
 129         struct v9fs_session_info *v9ses = sb->s_fs_info;
 130
 131         i_ino = v9fs_qid2ino(qid);
 132         inode = iget5_locked(sb, i_ino, v9fs_test_inode_dotl,
 133                              v9fs_set_inode_dotl, st);
 134         if (!inode)
 135                 return ERR_PTR(-ENOMEM);
 136         if (!(inode->i_state & I_NEW))
 137                 return inode;
 138         /*
 139          * initialize the inode with the stat info
 140          * FIXME!! we may need support for stale inodes
 141          * later.
 142          */
 143         inode->i_ino = i_ino;
 144         retval = v9fs_init_inode(v9ses, inode, st->st_mode);
 145         if (retval)
 146                 goto error;
 147
 148         v9fs_stat2inode_dotl(st, inode);
 149 #ifdef CONFIG_9P_FSCACHE
 150         v9fs_cache_inode_get_cookie(inode);
 151 #endif
 152         retval = v9fs_get_acl(inode, fid);
 153         if (retval)
 154                 goto error;
 155
 156         unlock_new_inode(inode);
 157         return inode;
 158 error:
 159         unlock_new_inode(inode);
 160         iput(inode);
 161         return ERR_PTR(retval);
 162
 163 }
 164
 165 struct inode *
 166 v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
 167                          struct super_block *sb)
 168 {
 169         struct p9_stat_dotl *st;
 170         struct inode *inode = NULL;
 171
 172         st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN);
 173         if (IS_ERR(st))
 174                 return ERR_CAST(st);
 175
 176         inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st);
 177         kfree(st);
 178         return inode;
 179 }
 180
 181 /**
 182  * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
 183  * @dir: directory inode that is being created
 184  * @dentry:  dentry that is being deleted
 185  * @mode: create permissions
 186  * @nd: path information
 187  *
 188  */
 189
 190 static int
 191 v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, int omode,
 192                 struct nameidata *nd)
 193 {
 194         int err = 0;
 195         gid_t gid;
 196         int flags;
 197         mode_t mode;
 198         char *name = NULL;
 199         struct file *filp;
 200         struct p9_qid qid;
 201         struct inode *inode;
 202         struct p9_fid *fid = NULL;
 203         struct v9fs_inode *v9inode;
 204         struct p9_fid *dfid, *ofid, *inode_fid;
 205         struct v9fs_session_info *v9ses;
 206         struct posix_acl *pacl = NULL, *dacl = NULL;
 207
 208         v9ses = v9fs_inode2v9ses(dir);
 209         if (nd && nd->flags & LOOKUP_OPEN)
 210                 flags = nd->intent.open.flags - 1;
 211         else {
 212                 /*
 213                  * create call without LOOKUP_OPEN is due
 214                  * to mknod of regular files. So use mknod
 215                  * operation.
 216                  */
 217                 return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
 218         }
 219
 220         name = (char *) dentry->d_name.name;
 221         P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_create_dotl: name:%s flags:0x%x "
 222                         "mode:0x%x\n", name, flags, omode);
 223
 224         dfid = v9fs_fid_lookup(dentry->d_parent);
 225         if (IS_ERR(dfid)) {
 226                 err = PTR_ERR(dfid);
 227                 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 228                 return err;
 229         }
 230
 231         /* clone a fid to use for creation */
 232         ofid = p9_client_walk(dfid, 0, NULL, 1);
 233         if (IS_ERR(ofid)) {
 234                 err = PTR_ERR(ofid);
 235                 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
 236                 return err;
 237         }
 238
 239         gid = v9fs_get_fsgid_for_create(dir);
 240
 241         mode = omode;
 242         /* Update mode based on ACL value */
 243         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 244         if (err) {
 245                 P9_DPRINTK(P9_DEBUG_VFS,
 246                            "Failed to get acl values in creat %d\n", err);
 247                 goto error;
 248         }
 249         err = p9_client_create_dotl(ofid, name, flags, mode, gid, &qid);
 250         if (err < 0) {
 251                 P9_DPRINTK(P9_DEBUG_VFS,
 252                                 "p9_client_open_dotl failed in creat %d\n",
 253                                 err);
 254                 goto error;
 255         }
 256         v9fs_invalidate_inode_attr(dir);
 257
 258         /* instantiate inode and assign the unopened fid to the dentry */
 259         fid = p9_client_walk(dfid, 1, &name, 1);
 260         if (IS_ERR(fid)) {
 261                 err = PTR_ERR(fid);
 262                 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
 263                 fid = NULL;
 264                 goto error;
 265         }
 266         inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
 267         if (IS_ERR(inode)) {
 268                 err = PTR_ERR(inode);
 269                 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err);
 270                 goto error;
 271         }
 272         d_instantiate(dentry, inode);
 273         err = v9fs_fid_add(dentry, fid);
 274         if (err < 0)
 275                 goto error;
 276
 277         /* Now set the ACL based on the default value */
 278         v9fs_set_create_acl(dentry, dacl, pacl);
 279
 280         v9inode = V9FS_I(inode);
 281         mutex_lock(&v9inode->v_mutex);
 282         if (v9ses->cache && !v9inode->writeback_fid &&
 283             ((flags & O_ACCMODE) != O_RDONLY)) {
 284                 /*
 285                  * clone a fid and add it to writeback_fid
 286                  * we do it during open time instead of
 287                  * page dirty time via write_begin/page_mkwrite
 288                  * because we want write after unlink usecase
 289                  * to work.
 290                  */
 291                 inode_fid = v9fs_writeback_fid(dentry);
 292                 if (IS_ERR(inode_fid)) {
 293                         err = PTR_ERR(inode_fid);
 294                         mutex_unlock(&v9inode->v_mutex);
 295                         goto err_clunk_old_fid;
 296                 }
 297                 v9inode->writeback_fid = (void *) inode_fid;
 298         }
 299         mutex_unlock(&v9inode->v_mutex);
 300         /* Since we are opening a file, assign the open fid to the file */
 301         filp = lookup_instantiate_filp(nd, dentry, generic_file_open);
 302         if (IS_ERR(filp)) {
 303                 err = PTR_ERR(filp);
 304                 goto err_clunk_old_fid;
 305         }
 306         filp->private_data = ofid;
 307 #ifdef CONFIG_9P_FSCACHE
 308         if (v9ses->cache)
 309                 v9fs_cache_inode_set_cookie(inode, filp);
 310 #endif
 311         return 0;
 312
 313 error:
 314         if (fid)
 315                 p9_client_clunk(fid);
 316 err_clunk_old_fid:
 317         if (ofid)
 318                 p9_client_clunk(ofid);
 319         return err;
 320 }
 321
 322 /**
 323  * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
 324  * @dir:  inode that is being unlinked
 325  * @dentry: dentry that is being unlinked
 326  * @mode: mode for new directory
 327  *
 328  */
 329
 330 static int v9fs_vfs_mkdir_dotl(struct inode *dir,
 331                                struct dentry *dentry, int omode)
 332 {
 333         int err;
 334         struct v9fs_session_info *v9ses;
 335         struct p9_fid *fid = NULL, *dfid = NULL;
 336         gid_t gid;
 337         char *name;
 338         mode_t mode;
 339         struct inode *inode;
 340         struct p9_qid qid;
 341         struct dentry *dir_dentry;
 342         struct posix_acl *dacl = NULL, *pacl = NULL;
 343
 344         P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
 345         err = 0;
 346         v9ses = v9fs_inode2v9ses(dir);
 347
 348         omode |= S_IFDIR;
 349         if (dir->i_mode & S_ISGID)
 350                 omode |= S_ISGID;
 351
 352         dir_dentry = v9fs_dentry_from_dir_inode(dir);
 353         dfid = v9fs_fid_lookup(dir_dentry);
 354         if (IS_ERR(dfid)) {
 355                 err = PTR_ERR(dfid);
 356                 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 357                 dfid = NULL;
 358                 goto error;
 359         }
 360
 361         gid = v9fs_get_fsgid_for_create(dir);
 362         mode = omode;
 363         /* Update mode based on ACL value */
 364         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 365         if (err) {
 366                 P9_DPRINTK(P9_DEBUG_VFS,
 367                            "Failed to get acl values in mkdir %d\n", err);
 368                 goto error;
 369         }
 370         name = (char *) dentry->d_name.name;
 371         err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
 372         if (err < 0)
 373                 goto error;
 374
 375         /* instantiate inode and assign the unopened fid to the dentry */
 376         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 377                 fid = p9_client_walk(dfid, 1, &name, 1);
 378                 if (IS_ERR(fid)) {
 379                         err = PTR_ERR(fid);
 380                         P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 381                                 err);
 382                         fid = NULL;
 383                         goto error;
 384                 }
 385
 386                 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
 387                 if (IS_ERR(inode)) {
 388                         err = PTR_ERR(inode);
 389                         P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
 390                                 err);
 391                         goto error;
 392                 }
 393                 d_instantiate(dentry, inode);
 394                 err = v9fs_fid_add(dentry, fid);
 395                 if (err < 0)
 396                         goto error;
 397                 fid = NULL;
 398         } else {
 399                 /*
 400                  * Not in cached mode. No need to populate
 401                  * inode with stat. We need to get an inode
 402                  * so that we can set the acl with dentry
 403                  */
 404                 inode = v9fs_get_inode(dir->i_sb, mode);
 405                 if (IS_ERR(inode)) {
 406                         err = PTR_ERR(inode);
 407                         goto error;
 408                 }
 409                 d_instantiate(dentry, inode);
 410         }
 411         /* Now set the ACL based on the default value */
 412         v9fs_set_create_acl(dentry, dacl, pacl);
 413         inc_nlink(dir);
 414         v9fs_invalidate_inode_attr(dir);
 415 error:
 416         if (fid)
 417                 p9_client_clunk(fid);
 418         return err;
 419 }
 420
 421 static int
 422 v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry,
 423                  struct kstat *stat)
 424 {
 425         int err;
 426         struct v9fs_session_info *v9ses;
 427         struct p9_fid *fid;
 428         struct p9_stat_dotl *st;
 429
 430         P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry);
 431         err = -EPERM;
 432         v9ses = v9fs_dentry2v9ses(dentry);
 433         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 434                 generic_fillattr(dentry->d_inode, stat);
 435                 return 0;
 436         }
 437         fid = v9fs_fid_lookup(dentry);
 438         if (IS_ERR(fid))
 439                 return PTR_ERR(fid);
 440
 441         /* Ask for all the fields in stat structure. Server will return
 442          * whatever it supports
 443          */
 444
 445         st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
 446         if (IS_ERR(st))
 447                 return PTR_ERR(st);
 448
 449         v9fs_stat2inode_dotl(st, dentry->d_inode);
 450         generic_fillattr(dentry->d_inode, stat);
 451         /* Change block size to what the server returned */
 452         stat->blksize = st->st_blksize;
 453
 454         kfree(st);
 455         return 0;
 456 }
 457
 458 /**
 459  * v9fs_vfs_setattr_dotl - set file metadata
 460  * @dentry: file whose metadata to set
 461  * @iattr: metadata assignment structure
 462  *
 463  */
 464
 465 int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
 466 {
 467         int retval;
 468         struct v9fs_session_info *v9ses;
 469         struct p9_fid *fid;
 470         struct p9_iattr_dotl p9attr;
 471
 472         P9_DPRINTK(P9_DEBUG_VFS, "\n");
 473
 474         retval = inode_change_ok(dentry->d_inode, iattr);
 475         if (retval)
 476                 return retval;
 477
 478         p9attr.valid = iattr->ia_valid;
 479         p9attr.mode = iattr->ia_mode;
 480         p9attr.uid = iattr->ia_uid;
 481         p9attr.gid = iattr->ia_gid;
 482         p9attr.size = iattr->ia_size;
 483         p9attr.atime_sec = iattr->ia_atime.tv_sec;
 484         p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
 485         p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
 486         p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
 487
 488         retval = -EPERM;
 489         v9ses = v9fs_dentry2v9ses(dentry);
 490         fid = v9fs_fid_lookup(dentry);
 491         if (IS_ERR(fid))
 492                 return PTR_ERR(fid);
 493
 494         /* Write all dirty data */
 495         if (S_ISREG(dentry->d_inode->i_mode))
 496                 filemap_write_and_wait(dentry->d_inode->i_mapping);
 497
 498         retval = p9_client_setattr(fid, &p9attr);
 499         if (retval < 0)
 500                 return retval;
 501
 502         if ((iattr->ia_valid & ATTR_SIZE) &&
 503             iattr->ia_size != i_size_read(dentry->d_inode))
 504                 truncate_setsize(dentry->d_inode, iattr->ia_size);
 505
 506         v9fs_invalidate_inode_attr(dentry->d_inode);
 507         setattr_copy(dentry->d_inode, iattr);
 508         mark_inode_dirty(dentry->d_inode);
 509         if (iattr->ia_valid & ATTR_MODE) {
 510                 /* We also want to update ACL when we update mode bits */
 511                 retval = v9fs_acl_chmod(dentry);
 512                 if (retval < 0)
 513                         return retval;
 514         }
 515         return 0;
 516 }
 517
 518 /**
 519  * v9fs_stat2inode_dotl - populate an inode structure with stat info
 520  * @stat: stat structure
 521  * @inode: inode to populate
 522  * @sb: superblock of filesystem
 523  *
 524  */
 525
 526 void
 527 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode)
 528 {
 529         struct v9fs_inode *v9inode = V9FS_I(inode);
 530
 531         if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
 532                 inode->i_atime.tv_sec = stat->st_atime_sec;
 533                 inode->i_atime.tv_nsec = stat->st_atime_nsec;
 534                 inode->i_mtime.tv_sec = stat->st_mtime_sec;
 535                 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
 536                 inode->i_ctime.tv_sec = stat->st_ctime_sec;
 537                 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
 538                 inode->i_uid = stat->st_uid;
 539                 inode->i_gid = stat->st_gid;
 540                 inode->i_nlink = stat->st_nlink;
 541                 inode->i_mode = stat->st_mode;
 542                 inode->i_rdev = new_decode_dev(stat->st_rdev);
 543
 544                 if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode)))
 545                         init_special_inode(inode, inode->i_mode, inode->i_rdev);
 546
 547                 i_size_write(inode, stat->st_size);
 548                 inode->i_blocks = stat->st_blocks;
 549         } else {
 550                 if (stat->st_result_mask & P9_STATS_ATIME) {
 551                         inode->i_atime.tv_sec = stat->st_atime_sec;
 552                         inode->i_atime.tv_nsec = stat->st_atime_nsec;
 553                 }
 554                 if (stat->st_result_mask & P9_STATS_MTIME) {
 555                         inode->i_mtime.tv_sec = stat->st_mtime_sec;
 556                         inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
 557                 }
 558                 if (stat->st_result_mask & P9_STATS_CTIME) {
 559                         inode->i_ctime.tv_sec = stat->st_ctime_sec;
 560                         inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
 561                 }
 562                 if (stat->st_result_mask & P9_STATS_UID)
 563                         inode->i_uid = stat->st_uid;
 564                 if (stat->st_result_mask & P9_STATS_GID)
 565                         inode->i_gid = stat->st_gid;
 566                 if (stat->st_result_mask & P9_STATS_NLINK)
 567                         inode->i_nlink = stat->st_nlink;
 568                 if (stat->st_result_mask & P9_STATS_MODE) {
 569                         inode->i_mode = stat->st_mode;
 570                         if ((S_ISBLK(inode->i_mode)) ||
 571                                                 (S_ISCHR(inode->i_mode)))
 572                                 init_special_inode(inode, inode->i_mode,
 573                                                                 inode->i_rdev);
 574                 }
 575                 if (stat->st_result_mask & P9_STATS_RDEV)
 576                         inode->i_rdev = new_decode_dev(stat->st_rdev);
 577                 if (stat->st_result_mask & P9_STATS_SIZE)
 578                         i_size_write(inode, stat->st_size);
 579                 if (stat->st_result_mask & P9_STATS_BLOCKS)
 580                         inode->i_blocks = stat->st_blocks;
 581         }
 582         if (stat->st_result_mask & P9_STATS_GEN)
 583                 inode->i_generation = stat->st_gen;
 584
 585         /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
 586          * because the inode structure does not have fields for them.
 587          */
 588         v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
 589 }
 590
 591 static int
 592 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
 593                 const char *symname)
 594 {
 595         int err;
 596         gid_t gid;
 597         char *name;
 598         struct p9_qid qid;
 599         struct inode *inode;
 600         struct p9_fid *dfid;
 601         struct p9_fid *fid = NULL;
 602         struct v9fs_session_info *v9ses;
 603
 604         name = (char *) dentry->d_name.name;
 605         P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_symlink_dotl : %lu,%s,%s\n",
 606                         dir->i_ino, name, symname);
 607         v9ses = v9fs_inode2v9ses(dir);
 608
 609         dfid = v9fs_fid_lookup(dentry->d_parent);
 610         if (IS_ERR(dfid)) {
 611                 err = PTR_ERR(dfid);
 612                 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 613                 return err;
 614         }
 615
 616         gid = v9fs_get_fsgid_for_create(dir);
 617
 618         /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
 619         err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid);
 620
 621         if (err < 0) {
 622                 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
 623                 goto error;
 624         }
 625
 626         v9fs_invalidate_inode_attr(dir);
 627         if (v9ses->cache) {
 628                 /* Now walk from the parent so we can get an unopened fid. */
 629                 fid = p9_client_walk(dfid, 1, &name, 1);
 630                 if (IS_ERR(fid)) {
 631                         err = PTR_ERR(fid);
 632                         P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 633                                         err);
 634                         fid = NULL;
 635                         goto error;
 636                 }
 637
 638                 /* instantiate inode and assign the unopened fid to dentry */
 639                 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
 640                 if (IS_ERR(inode)) {
 641                         err = PTR_ERR(inode);
 642                         P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
 643                                         err);
 644                         goto error;
 645                 }
 646                 d_instantiate(dentry, inode);
 647                 err = v9fs_fid_add(dentry, fid);
 648                 if (err < 0)
 649                         goto error;
 650                 fid = NULL;
 651         } else {
 652                 /* Not in cached mode. No need to populate inode with stat */
 653                 inode = v9fs_get_inode(dir->i_sb, S_IFLNK);
 654                 if (IS_ERR(inode)) {
 655                         err = PTR_ERR(inode);
 656                         goto error;
 657                 }
 658                 d_instantiate(dentry, inode);
 659         }
 660
 661 error:
 662         if (fid)
 663                 p9_client_clunk(fid);
 664
 665         return err;
 666 }
 667
 668 /**
 669  * v9fs_vfs_link_dotl - create a hardlink for dotl
 670  * @old_dentry: dentry for file to link to
 671  * @dir: inode destination for new link
 672  * @dentry: dentry for link
 673  *
 674  */
 675
 676 static int
 677 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
 678                 struct dentry *dentry)
 679 {
 680         int err;
 681         char *name;
 682         struct dentry *dir_dentry;
 683         struct p9_fid *dfid, *oldfid;
 684         struct v9fs_session_info *v9ses;
 685
 686         P9_DPRINTK(P9_DEBUG_VFS, "dir ino: %lu, old_name: %s, new_name: %s\n",
 687                         dir->i_ino, old_dentry->d_name.name,
 688                         dentry->d_name.name);
 689
 690         v9ses = v9fs_inode2v9ses(dir);
 691         dir_dentry = v9fs_dentry_from_dir_inode(dir);
 692         dfid = v9fs_fid_lookup(dir_dentry);
 693         if (IS_ERR(dfid))
 694                 return PTR_ERR(dfid);
 695
 696         oldfid = v9fs_fid_lookup(old_dentry);
 697         if (IS_ERR(oldfid))
 698                 return PTR_ERR(oldfid);
 699
 700         name = (char *) dentry->d_name.name;
 701
 702         err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name);
 703
 704         if (err < 0) {
 705                 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
 706                 return err;
 707         }
 708
 709         v9fs_invalidate_inode_attr(dir);
 710         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 711                 /* Get the latest stat info from server. */
 712                 struct p9_fid *fid;
 713                 fid = v9fs_fid_lookup(old_dentry);
 714                 if (IS_ERR(fid))
 715                         return PTR_ERR(fid);
 716
 717                 v9fs_refresh_inode_dotl(fid, old_dentry->d_inode);
 718         }
 719         ihold(old_dentry->d_inode);
 720         d_instantiate(dentry, old_dentry->d_inode);
 721
 722         return err;
 723 }
 724
 725 /**
 726  * v9fs_vfs_mknod_dotl - create a special file
 727  * @dir: inode destination for new link
 728  * @dentry: dentry for file
 729  * @mode: mode for creation
 730  * @rdev: device associated with special file
 731  *
 732  */
 733 static int
 734 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int omode,
 735                 dev_t rdev)
 736 {
 737         int err;
 738         gid_t gid;
 739         char *name;
 740         mode_t mode;
 741         struct v9fs_session_info *v9ses;
 742         struct p9_fid *fid = NULL, *dfid = NULL;
 743         struct inode *inode;
 744         struct p9_qid qid;
 745         struct dentry *dir_dentry;
 746         struct posix_acl *dacl = NULL, *pacl = NULL;
 747
 748         P9_DPRINTK(P9_DEBUG_VFS,
 749                 " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
 750                 dentry->d_name.name, omode, MAJOR(rdev), MINOR(rdev));
 751
 752         if (!new_valid_dev(rdev))
 753                 return -EINVAL;
 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                 err = PTR_ERR(dfid);
 760                 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 761                 dfid = NULL;
 762                 goto error;
 763         }
 764
 765         gid = v9fs_get_fsgid_for_create(dir);
 766         mode = omode;
 767         /* Update mode based on ACL value */
 768         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 769         if (err) {
 770                 P9_DPRINTK(P9_DEBUG_VFS,
 771                            "Failed to get acl values in mknod %d\n", err);
 772                 goto error;
 773         }
 774         name = (char *) dentry->d_name.name;
 775
 776         err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
 777         if (err < 0)
 778                 goto error;
 779
 780         v9fs_invalidate_inode_attr(dir);
 781         /* instantiate inode and assign the unopened fid to the dentry */
 782         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 783                 fid = p9_client_walk(dfid, 1, &name, 1);
 784                 if (IS_ERR(fid)) {
 785                         err = PTR_ERR(fid);
 786                         P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 787                                 err);
 788                         fid = NULL;
 789                         goto error;
 790                 }
 791
 792                 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
 793                 if (IS_ERR(inode)) {
 794                         err = PTR_ERR(inode);
 795                         P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
 796                                 err);
 797                         goto error;
 798                 }
 799                 d_instantiate(dentry, inode);
 800                 err = v9fs_fid_add(dentry, fid);
 801                 if (err < 0)
 802                         goto error;
 803                 fid = NULL;
 804         } else {
 805                 /*
 806                  * Not in cached mode. No need to populate inode with stat.
 807                  * socket syscall returns a fd, so we need instantiate
 808                  */
 809                 inode = v9fs_get_inode(dir->i_sb, mode);
 810                 if (IS_ERR(inode)) {
 811                         err = PTR_ERR(inode);
 812                         goto error;
 813                 }
 814                 d_instantiate(dentry, inode);
 815         }
 816         /* Now set the ACL based on the default value */
 817         v9fs_set_create_acl(dentry, dacl, pacl);
 818 error:
 819         if (fid)
 820                 p9_client_clunk(fid);
 821         return err;
 822 }
 823
 824 /**
 825  * v9fs_vfs_follow_link_dotl - follow a symlink path
 826  * @dentry: dentry for symlink
 827  * @nd: nameidata
 828  *
 829  */
 830
 831 static void *
 832 v9fs_vfs_follow_link_dotl(struct dentry *dentry, struct nameidata *nd)
 833 {
 834         int retval;
 835         struct p9_fid *fid;
 836         char *link = __getname();
 837         char *target;
 838
 839         P9_DPRINTK(P9_DEBUG_VFS, "%s\n", dentry->d_name.name);
 840
 841         if (!link) {
 842                 link = ERR_PTR(-ENOMEM);
 843                 goto ndset;
 844         }
 845         fid = v9fs_fid_lookup(dentry);
 846         if (IS_ERR(fid)) {
 847                 __putname(link);
 848                 link = ERR_CAST(fid);
 849                 goto ndset;
 850         }
 851         retval = p9_client_readlink(fid, &target);
 852         if (!retval) {
 853                 strcpy(link, target);
 854                 kfree(target);
 855                 goto ndset;
 856         }
 857         __putname(link);
 858         link = ERR_PTR(retval);
 859 ndset:
 860         nd_set_link(nd, link);
 861         return NULL;
 862 }
 863
 864 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
 865 {
 866         loff_t i_size;
 867         struct p9_stat_dotl *st;
 868         struct v9fs_session_info *v9ses;
 869
 870         v9ses = v9fs_inode2v9ses(inode);
 871         st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
 872         if (IS_ERR(st))
 873                 return PTR_ERR(st);
 874
 875         spin_lock(&inode->i_lock);
 876         /*
 877          * We don't want to refresh inode->i_size,
 878          * because we may have cached data
 879          */
 880         i_size = inode->i_size;
 881         v9fs_stat2inode_dotl(st, inode);
 882         if (v9ses->cache)
 883                 inode->i_size = i_size;
 884         spin_unlock(&inode->i_lock);
 885         kfree(st);
 886         return 0;
 887 }
 888
 889 const struct inode_operations v9fs_dir_inode_operations_dotl = {
 890         .create = v9fs_vfs_create_dotl,
 891         .lookup = v9fs_vfs_lookup,
 892         .link = v9fs_vfs_link_dotl,
 893         .symlink = v9fs_vfs_symlink_dotl,
 894         .unlink = v9fs_vfs_unlink,
 895         .mkdir = v9fs_vfs_mkdir_dotl,
 896         .rmdir = v9fs_vfs_rmdir,
 897         .mknod = v9fs_vfs_mknod_dotl,
 898         .rename = v9fs_vfs_rename,
 899         .getattr = v9fs_vfs_getattr_dotl,
 900         .setattr = v9fs_vfs_setattr_dotl,
 901         .setxattr = generic_setxattr,
 902         .getxattr = generic_getxattr,
 903         .removexattr = generic_removexattr,
 904         .listxattr = v9fs_listxattr,
 905         .check_acl = v9fs_check_acl,
 906 };
 907
 908 const struct inode_operations v9fs_file_inode_operations_dotl = {
 909         .getattr = v9fs_vfs_getattr_dotl,
 910         .setattr = v9fs_vfs_setattr_dotl,
 911         .setxattr = generic_setxattr,
 912         .getxattr = generic_getxattr,
 913         .removexattr = generic_removexattr,
 914         .listxattr = v9fs_listxattr,
 915         .check_acl = v9fs_check_acl,
 916 };
 917
 918 const struct inode_operations v9fs_symlink_inode_operations_dotl = {
 919         .readlink = generic_readlink,
 920         .follow_link = v9fs_vfs_follow_link_dotl,
 921         .put_link = v9fs_vfs_put_link,
 922         .getattr = v9fs_vfs_getattr_dotl,
 923         .setattr = v9fs_vfs_setattr_dotl,
 924         .setxattr = generic_setxattr,
 925         .getxattr = generic_getxattr,
 926         .removexattr = generic_removexattr,
 927         .listxattr = v9fs_listxattr,
 928 };