fs/9p/vfs_inode

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This source file includes following definitions.
v9fs_get_fsgid_for_create
v9fs_test_inode_dotl
v9fs_test_new_inode_dotl
v9fs_set_inode_dotl
v9fs_qid_iget_dotl
v9fs_inode_from_fid_dotl
v9fs_mapped_dotl_flags
v9fs_open_to_dotl_flags
v9fs_vfs_create_dotl
v9fs_vfs_atomic_open_dotl
v9fs_vfs_mkdir_dotl
v9fs_vfs_getattr_dotl
v9fs_mapped_iattr_valid
v9fs_vfs_setattr_dotl
v9fs_stat2inode_dotl
v9fs_vfs_symlink_dotl
v9fs_vfs_link_dotl
v9fs_vfs_mknod_dotl
v9fs_vfs_get_link_dotl
v9fs_refresh_inode_dotl
   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  linux/fs/9p/vfs_inode_dotl.c
   4  *
   5  * This file contains vfs inode ops for the 9P2000.L protocol.
   6  *
   7  *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
   8  *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
   9  */
  10 
  11 #include <linux/module.h>
  12 #include <linux/errno.h>
  13 #include <linux/fs.h>
  14 #include <linux/file.h>
  15 #include <linux/pagemap.h>
  16 #include <linux/stat.h>
  17 #include <linux/string.h>
  18 #include <linux/inet.h>
  19 #include <linux/namei.h>
  20 #include <linux/idr.h>
  21 #include <linux/sched.h>
  22 #include <linux/slab.h>
  23 #include <linux/xattr.h>
  24 #include <linux/posix_acl.h>
  25 #include <net/9p/9p.h>
  26 #include <net/9p/client.h>
  27 
  28 #include "v9fs.h"
  29 #include "v9fs_vfs.h"
  30 #include "fid.h"
  31 #include "cache.h"
  32 #include "xattr.h"
  33 #include "acl.h"
  34 
  35 static int
  36 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
  37                     dev_t rdev);
  38 
  39 /**
  40  * v9fs_get_fsgid_for_create - Helper function to get the gid for creating a
  41  * new file system object. This checks the S_ISGID to determine the owning
  42  * group of the new file system object.
  43  */
  44 
  45 static kgid_t v9fs_get_fsgid_for_create(struct inode *dir_inode)
  46 {
  47         BUG_ON(dir_inode == NULL);
  48 
  49         if (dir_inode->i_mode & S_ISGID) {
  50                 /* set_gid bit is set.*/
  51                 return dir_inode->i_gid;
  52         }
  53         return current_fsgid();
  54 }
  55 
  56 static int v9fs_test_inode_dotl(struct inode *inode, void *data)
  57 {
  58         struct v9fs_inode *v9inode = V9FS_I(inode);
  59         struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
  60 
  61         /* don't match inode of different type */
  62         if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
  63                 return 0;
  64 
  65         if (inode->i_generation != st->st_gen)
  66                 return 0;
  67 
  68         /* compare qid details */
  69         if (memcmp(&v9inode->qid.version,
  70                    &st->qid.version, sizeof(v9inode->qid.version)))
  71                 return 0;
  72 
  73         if (v9inode->qid.type != st->qid.type)
  74                 return 0;
  75 
  76         if (v9inode->qid.path != st->qid.path)
  77                 return 0;
  78         return 1;
  79 }
  80 
  81 /* Always get a new inode */
  82 static int v9fs_test_new_inode_dotl(struct inode *inode, void *data)
  83 {
  84         return 0;
  85 }
  86 
  87 static int v9fs_set_inode_dotl(struct inode *inode,  void *data)
  88 {
  89         struct v9fs_inode *v9inode = V9FS_I(inode);
  90         struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
  91 
  92         memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
  93         inode->i_generation = st->st_gen;
  94         return 0;
  95 }
  96 
  97 static struct inode *v9fs_qid_iget_dotl(struct super_block *sb,
  98                                         struct p9_qid *qid,
  99                                         struct p9_fid *fid,
 100                                         struct p9_stat_dotl *st,
 101                                         int new)
 102 {
 103         int retval;
 104         unsigned long i_ino;
 105         struct inode *inode;
 106         struct v9fs_session_info *v9ses = sb->s_fs_info;
 107         int (*test)(struct inode *, void *);
 108 
 109         if (new)
 110                 test = v9fs_test_new_inode_dotl;
 111         else
 112                 test = v9fs_test_inode_dotl;
 113 
 114         i_ino = v9fs_qid2ino(qid);
 115         inode = iget5_locked(sb, i_ino, test, v9fs_set_inode_dotl, st);
 116         if (!inode)
 117                 return ERR_PTR(-ENOMEM);
 118         if (!(inode->i_state & I_NEW))
 119                 return inode;
 120         /*
 121          * initialize the inode with the stat info
 122          * FIXME!! we may need support for stale inodes
 123          * later.
 124          */
 125         inode->i_ino = i_ino;
 126         retval = v9fs_init_inode(v9ses, inode,
 127                                  st->st_mode, new_decode_dev(st->st_rdev));
 128         if (retval)
 129                 goto error;
 130 
 131         v9fs_stat2inode_dotl(st, inode, 0);
 132         v9fs_cache_inode_get_cookie(inode);
 133         retval = v9fs_get_acl(inode, fid);
 134         if (retval)
 135                 goto error;
 136 
 137         unlock_new_inode(inode);
 138         return inode;
 139 error:
 140         iget_failed(inode);
 141         return ERR_PTR(retval);
 142 
 143 }
 144 
 145 struct inode *
 146 v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
 147                          struct super_block *sb, int new)
 148 {
 149         struct p9_stat_dotl *st;
 150         struct inode *inode = NULL;
 151 
 152         st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN);
 153         if (IS_ERR(st))
 154                 return ERR_CAST(st);
 155 
 156         inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new);
 157         kfree(st);
 158         return inode;
 159 }
 160 
 161 struct dotl_openflag_map {
 162         int open_flag;
 163         int dotl_flag;
 164 };
 165 
 166 static int v9fs_mapped_dotl_flags(int flags)
 167 {
 168         int i;
 169         int rflags = 0;
 170         struct dotl_openflag_map dotl_oflag_map[] = {
 171                 { O_CREAT,      P9_DOTL_CREATE },
 172                 { O_EXCL,       P9_DOTL_EXCL },
 173                 { O_NOCTTY,     P9_DOTL_NOCTTY },
 174                 { O_APPEND,     P9_DOTL_APPEND },
 175                 { O_NONBLOCK,   P9_DOTL_NONBLOCK },
 176                 { O_DSYNC,      P9_DOTL_DSYNC },
 177                 { FASYNC,       P9_DOTL_FASYNC },
 178                 { O_DIRECT,     P9_DOTL_DIRECT },
 179                 { O_LARGEFILE,  P9_DOTL_LARGEFILE },
 180                 { O_DIRECTORY,  P9_DOTL_DIRECTORY },
 181                 { O_NOFOLLOW,   P9_DOTL_NOFOLLOW },
 182                 { O_NOATIME,    P9_DOTL_NOATIME },
 183                 { O_CLOEXEC,    P9_DOTL_CLOEXEC },
 184                 { O_SYNC,       P9_DOTL_SYNC},
 185         };
 186         for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) {
 187                 if (flags & dotl_oflag_map[i].open_flag)
 188                         rflags |= dotl_oflag_map[i].dotl_flag;
 189         }
 190         return rflags;
 191 }
 192 
 193 /**
 194  * v9fs_open_to_dotl_flags- convert Linux specific open flags to
 195  * plan 9 open flag.
 196  * @flags: flags to convert
 197  */
 198 int v9fs_open_to_dotl_flags(int flags)
 199 {
 200         int rflags = 0;
 201 
 202         /*
 203          * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
 204          * and P9_DOTL_NOACCESS
 205          */
 206         rflags |= flags & O_ACCMODE;
 207         rflags |= v9fs_mapped_dotl_flags(flags);
 208 
 209         return rflags;
 210 }
 211 
 212 /**
 213  * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
 214  * @dir: directory inode that is being created
 215  * @dentry:  dentry that is being deleted
 216  * @omode: create permissions
 217  *
 218  */
 219 
 220 static int
 221 v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
 222                 bool excl)
 223 {
 224         return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
 225 }
 226 
 227 static int
 228 v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
 229                           struct file *file, unsigned flags, umode_t omode)
 230 {
 231         int err = 0;
 232         kgid_t gid;
 233         umode_t mode;
 234         const unsigned char *name = NULL;
 235         struct p9_qid qid;
 236         struct inode *inode;
 237         struct p9_fid *fid = NULL;
 238         struct v9fs_inode *v9inode;
 239         struct p9_fid *dfid, *ofid, *inode_fid;
 240         struct v9fs_session_info *v9ses;
 241         struct posix_acl *pacl = NULL, *dacl = NULL;
 242         struct dentry *res = NULL;
 243 
 244         if (d_in_lookup(dentry)) {
 245                 res = v9fs_vfs_lookup(dir, dentry, 0);
 246                 if (IS_ERR(res))
 247                         return PTR_ERR(res);
 248 
 249                 if (res)
 250                         dentry = res;
 251         }
 252 
 253         /* Only creates */
 254         if (!(flags & O_CREAT) || d_really_is_positive(dentry))
 255                 return  finish_no_open(file, res);
 256 
 257         v9ses = v9fs_inode2v9ses(dir);
 258 
 259         name = dentry->d_name.name;
 260         p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%hx\n",
 261                  name, flags, omode);
 262 
 263         dfid = v9fs_parent_fid(dentry);
 264         if (IS_ERR(dfid)) {
 265                 err = PTR_ERR(dfid);
 266                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 267                 goto out;
 268         }
 269 
 270         /* clone a fid to use for creation */
 271         ofid = clone_fid(dfid);
 272         if (IS_ERR(ofid)) {
 273                 err = PTR_ERR(ofid);
 274                 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
 275                 goto out;
 276         }
 277 
 278         gid = v9fs_get_fsgid_for_create(dir);
 279 
 280         mode = omode;
 281         /* Update mode based on ACL value */
 282         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 283         if (err) {
 284                 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in creat %d\n",
 285                          err);
 286                 goto error;
 287         }
 288         err = p9_client_create_dotl(ofid, name, v9fs_open_to_dotl_flags(flags),
 289                                     mode, gid, &qid);
 290         if (err < 0) {
 291                 p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in creat %d\n",
 292                          err);
 293                 goto error;
 294         }
 295         v9fs_invalidate_inode_attr(dir);
 296 
 297         /* instantiate inode and assign the unopened fid to the dentry */
 298         fid = p9_client_walk(dfid, 1, &name, 1);
 299         if (IS_ERR(fid)) {
 300                 err = PTR_ERR(fid);
 301                 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
 302                 fid = NULL;
 303                 goto error;
 304         }
 305         inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 306         if (IS_ERR(inode)) {
 307                 err = PTR_ERR(inode);
 308                 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err);
 309                 goto error;
 310         }
 311         /* Now set the ACL based on the default value */
 312         v9fs_set_create_acl(inode, fid, dacl, pacl);
 313 
 314         v9fs_fid_add(dentry, fid);
 315         d_instantiate(dentry, inode);
 316 
 317         v9inode = V9FS_I(inode);
 318         mutex_lock(&v9inode->v_mutex);
 319         if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) &&
 320             !v9inode->writeback_fid &&
 321             ((flags & O_ACCMODE) != O_RDONLY)) {
 322                 /*
 323                  * clone a fid and add it to writeback_fid
 324                  * we do it during open time instead of
 325                  * page dirty time via write_begin/page_mkwrite
 326                  * because we want write after unlink usecase
 327                  * to work.
 328                  */
 329                 inode_fid = v9fs_writeback_fid(dentry);
 330                 if (IS_ERR(inode_fid)) {
 331                         err = PTR_ERR(inode_fid);
 332                         mutex_unlock(&v9inode->v_mutex);
 333                         goto err_clunk_old_fid;
 334                 }
 335                 v9inode->writeback_fid = (void *) inode_fid;
 336         }
 337         mutex_unlock(&v9inode->v_mutex);
 338         /* Since we are opening a file, assign the open fid to the file */
 339         err = finish_open(file, dentry, generic_file_open);
 340         if (err)
 341                 goto err_clunk_old_fid;
 342         file->private_data = ofid;
 343         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
 344                 v9fs_cache_inode_set_cookie(inode, file);
 345         file->f_mode |= FMODE_CREATED;
 346 out:
 347         v9fs_put_acl(dacl, pacl);
 348         dput(res);
 349         return err;
 350 
 351 error:
 352         if (fid)
 353                 p9_client_clunk(fid);
 354 err_clunk_old_fid:
 355         if (ofid)
 356                 p9_client_clunk(ofid);
 357         goto out;
 358 }
 359 
 360 /**
 361  * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
 362  * @dir:  inode that is being unlinked
 363  * @dentry: dentry that is being unlinked
 364  * @omode: mode for new directory
 365  *
 366  */
 367 
 368 static int v9fs_vfs_mkdir_dotl(struct inode *dir,
 369                                struct dentry *dentry, umode_t omode)
 370 {
 371         int err;
 372         struct v9fs_session_info *v9ses;
 373         struct p9_fid *fid = NULL, *dfid = NULL;
 374         kgid_t gid;
 375         const unsigned char *name;
 376         umode_t mode;
 377         struct inode *inode;
 378         struct p9_qid qid;
 379         struct posix_acl *dacl = NULL, *pacl = NULL;
 380 
 381         p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
 382         err = 0;
 383         v9ses = v9fs_inode2v9ses(dir);
 384 
 385         omode |= S_IFDIR;
 386         if (dir->i_mode & S_ISGID)
 387                 omode |= S_ISGID;
 388 
 389         dfid = v9fs_parent_fid(dentry);
 390         if (IS_ERR(dfid)) {
 391                 err = PTR_ERR(dfid);
 392                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 393                 dfid = NULL;
 394                 goto error;
 395         }
 396 
 397         gid = v9fs_get_fsgid_for_create(dir);
 398         mode = omode;
 399         /* Update mode based on ACL value */
 400         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 401         if (err) {
 402                 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n",
 403                          err);
 404                 goto error;
 405         }
 406         name = dentry->d_name.name;
 407         err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
 408         if (err < 0)
 409                 goto error;
 410 
 411         fid = p9_client_walk(dfid, 1, &name, 1);
 412         if (IS_ERR(fid)) {
 413                 err = PTR_ERR(fid);
 414                 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 415                          err);
 416                 fid = NULL;
 417                 goto error;
 418         }
 419 
 420         /* instantiate inode and assign the unopened fid to the dentry */
 421         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 422                 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 423                 if (IS_ERR(inode)) {
 424                         err = PTR_ERR(inode);
 425                         p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
 426                                  err);
 427                         goto error;
 428                 }
 429                 v9fs_fid_add(dentry, fid);
 430                 v9fs_set_create_acl(inode, fid, dacl, pacl);
 431                 d_instantiate(dentry, inode);
 432                 fid = NULL;
 433                 err = 0;
 434         } else {
 435                 /*
 436                  * Not in cached mode. No need to populate
 437                  * inode with stat. We need to get an inode
 438                  * so that we can set the acl with dentry
 439                  */
 440                 inode = v9fs_get_inode(dir->i_sb, mode, 0);
 441                 if (IS_ERR(inode)) {
 442                         err = PTR_ERR(inode);
 443                         goto error;
 444                 }
 445                 v9fs_set_create_acl(inode, fid, dacl, pacl);
 446                 d_instantiate(dentry, inode);
 447         }
 448         inc_nlink(dir);
 449         v9fs_invalidate_inode_attr(dir);
 450 error:
 451         if (fid)
 452                 p9_client_clunk(fid);
 453         v9fs_put_acl(dacl, pacl);
 454         return err;
 455 }
 456 
 457 static int
 458 v9fs_vfs_getattr_dotl(const struct path *path, struct kstat *stat,
 459                  u32 request_mask, unsigned int flags)
 460 {
 461         struct dentry *dentry = path->dentry;
 462         struct v9fs_session_info *v9ses;
 463         struct p9_fid *fid;
 464         struct p9_stat_dotl *st;
 465 
 466         p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
 467         v9ses = v9fs_dentry2v9ses(dentry);
 468         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 469                 generic_fillattr(d_inode(dentry), stat);
 470                 return 0;
 471         }
 472         fid = v9fs_fid_lookup(dentry);
 473         if (IS_ERR(fid))
 474                 return PTR_ERR(fid);
 475 
 476         /* Ask for all the fields in stat structure. Server will return
 477          * whatever it supports
 478          */
 479 
 480         st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
 481         if (IS_ERR(st))
 482                 return PTR_ERR(st);
 483 
 484         v9fs_stat2inode_dotl(st, d_inode(dentry), 0);
 485         generic_fillattr(d_inode(dentry), stat);
 486         /* Change block size to what the server returned */
 487         stat->blksize = st->st_blksize;
 488 
 489         kfree(st);
 490         return 0;
 491 }
 492 
 493 /*
 494  * Attribute flags.
 495  */
 496 #define P9_ATTR_MODE            (1 << 0)
 497 #define P9_ATTR_UID             (1 << 1)
 498 #define P9_ATTR_GID             (1 << 2)
 499 #define P9_ATTR_SIZE            (1 << 3)
 500 #define P9_ATTR_ATIME           (1 << 4)
 501 #define P9_ATTR_MTIME           (1 << 5)
 502 #define P9_ATTR_CTIME           (1 << 6)
 503 #define P9_ATTR_ATIME_SET       (1 << 7)
 504 #define P9_ATTR_MTIME_SET       (1 << 8)
 505 
 506 struct dotl_iattr_map {
 507         int iattr_valid;
 508         int p9_iattr_valid;
 509 };
 510 
 511 static int v9fs_mapped_iattr_valid(int iattr_valid)
 512 {
 513         int i;
 514         int p9_iattr_valid = 0;
 515         struct dotl_iattr_map dotl_iattr_map[] = {
 516                 { ATTR_MODE,            P9_ATTR_MODE },
 517                 { ATTR_UID,             P9_ATTR_UID },
 518                 { ATTR_GID,             P9_ATTR_GID },
 519                 { ATTR_SIZE,            P9_ATTR_SIZE },
 520                 { ATTR_ATIME,           P9_ATTR_ATIME },
 521                 { ATTR_MTIME,           P9_ATTR_MTIME },
 522                 { ATTR_CTIME,           P9_ATTR_CTIME },
 523                 { ATTR_ATIME_SET,       P9_ATTR_ATIME_SET },
 524                 { ATTR_MTIME_SET,       P9_ATTR_MTIME_SET },
 525         };
 526         for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) {
 527                 if (iattr_valid & dotl_iattr_map[i].iattr_valid)
 528                         p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid;
 529         }
 530         return p9_iattr_valid;
 531 }
 532 
 533 /**
 534  * v9fs_vfs_setattr_dotl - set file metadata
 535  * @dentry: file whose metadata to set
 536  * @iattr: metadata assignment structure
 537  *
 538  */
 539 
 540 int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
 541 {
 542         int retval;
 543         struct p9_fid *fid;
 544         struct p9_iattr_dotl p9attr;
 545         struct inode *inode = d_inode(dentry);
 546 
 547         p9_debug(P9_DEBUG_VFS, "\n");
 548 
 549         retval = setattr_prepare(dentry, iattr);
 550         if (retval)
 551                 return retval;
 552 
 553         p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid);
 554         p9attr.mode = iattr->ia_mode;
 555         p9attr.uid = iattr->ia_uid;
 556         p9attr.gid = iattr->ia_gid;
 557         p9attr.size = iattr->ia_size;
 558         p9attr.atime_sec = iattr->ia_atime.tv_sec;
 559         p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
 560         p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
 561         p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
 562 
 563         fid = v9fs_fid_lookup(dentry);
 564         if (IS_ERR(fid))
 565                 return PTR_ERR(fid);
 566 
 567         /* Write all dirty data */
 568         if (S_ISREG(inode->i_mode))
 569                 filemap_write_and_wait(inode->i_mapping);
 570 
 571         retval = p9_client_setattr(fid, &p9attr);
 572         if (retval < 0)
 573                 return retval;
 574 
 575         if ((iattr->ia_valid & ATTR_SIZE) &&
 576             iattr->ia_size != i_size_read(inode))
 577                 truncate_setsize(inode, iattr->ia_size);
 578 
 579         v9fs_invalidate_inode_attr(inode);
 580         setattr_copy(inode, iattr);
 581         mark_inode_dirty(inode);
 582         if (iattr->ia_valid & ATTR_MODE) {
 583                 /* We also want to update ACL when we update mode bits */
 584                 retval = v9fs_acl_chmod(inode, fid);
 585                 if (retval < 0)
 586                         return retval;
 587         }
 588         return 0;
 589 }
 590 
 591 /**
 592  * v9fs_stat2inode_dotl - populate an inode structure with stat info
 593  * @stat: stat structure
 594  * @inode: inode to populate
 595  * @flags: ctrl flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE)
 596  *
 597  */
 598 
 599 void
 600 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode,
 601                       unsigned int flags)
 602 {
 603         umode_t mode;
 604         struct v9fs_inode *v9inode = V9FS_I(inode);
 605 
 606         if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
 607                 inode->i_atime.tv_sec = stat->st_atime_sec;
 608                 inode->i_atime.tv_nsec = stat->st_atime_nsec;
 609                 inode->i_mtime.tv_sec = stat->st_mtime_sec;
 610                 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
 611                 inode->i_ctime.tv_sec = stat->st_ctime_sec;
 612                 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
 613                 inode->i_uid = stat->st_uid;
 614                 inode->i_gid = stat->st_gid;
 615                 set_nlink(inode, stat->st_nlink);
 616 
 617                 mode = stat->st_mode & S_IALLUGO;
 618                 mode |= inode->i_mode & ~S_IALLUGO;
 619                 inode->i_mode = mode;
 620 
 621                 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE))
 622                         v9fs_i_size_write(inode, stat->st_size);
 623                 inode->i_blocks = stat->st_blocks;
 624         } else {
 625                 if (stat->st_result_mask & P9_STATS_ATIME) {
 626                         inode->i_atime.tv_sec = stat->st_atime_sec;
 627                         inode->i_atime.tv_nsec = stat->st_atime_nsec;
 628                 }
 629                 if (stat->st_result_mask & P9_STATS_MTIME) {
 630                         inode->i_mtime.tv_sec = stat->st_mtime_sec;
 631                         inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
 632                 }
 633                 if (stat->st_result_mask & P9_STATS_CTIME) {
 634                         inode->i_ctime.tv_sec = stat->st_ctime_sec;
 635                         inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
 636                 }
 637                 if (stat->st_result_mask & P9_STATS_UID)
 638                         inode->i_uid = stat->st_uid;
 639                 if (stat->st_result_mask & P9_STATS_GID)
 640                         inode->i_gid = stat->st_gid;
 641                 if (stat->st_result_mask & P9_STATS_NLINK)
 642                         set_nlink(inode, stat->st_nlink);
 643                 if (stat->st_result_mask & P9_STATS_MODE) {
 644                         inode->i_mode = stat->st_mode;
 645                         if ((S_ISBLK(inode->i_mode)) ||
 646                                                 (S_ISCHR(inode->i_mode)))
 647                                 init_special_inode(inode, inode->i_mode,
 648                                                                 inode->i_rdev);
 649                 }
 650                 if (stat->st_result_mask & P9_STATS_RDEV)
 651                         inode->i_rdev = new_decode_dev(stat->st_rdev);
 652                 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE) &&
 653                     stat->st_result_mask & P9_STATS_SIZE)
 654                         v9fs_i_size_write(inode, stat->st_size);
 655                 if (stat->st_result_mask & P9_STATS_BLOCKS)
 656                         inode->i_blocks = stat->st_blocks;
 657         }
 658         if (stat->st_result_mask & P9_STATS_GEN)
 659                 inode->i_generation = stat->st_gen;
 660 
 661         /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
 662          * because the inode structure does not have fields for them.
 663          */
 664         v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
 665 }
 666 
 667 static int
 668 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
 669                 const char *symname)
 670 {
 671         int err;
 672         kgid_t gid;
 673         const unsigned char *name;
 674         struct p9_qid qid;
 675         struct inode *inode;
 676         struct p9_fid *dfid;
 677         struct p9_fid *fid = NULL;
 678         struct v9fs_session_info *v9ses;
 679 
 680         name = dentry->d_name.name;
 681         p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname);
 682         v9ses = v9fs_inode2v9ses(dir);
 683 
 684         dfid = v9fs_parent_fid(dentry);
 685         if (IS_ERR(dfid)) {
 686                 err = PTR_ERR(dfid);
 687                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 688                 return err;
 689         }
 690 
 691         gid = v9fs_get_fsgid_for_create(dir);
 692 
 693         /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
 694         err = p9_client_symlink(dfid, name, symname, gid, &qid);
 695 
 696         if (err < 0) {
 697                 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
 698                 goto error;
 699         }
 700 
 701         v9fs_invalidate_inode_attr(dir);
 702         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 703                 /* Now walk from the parent so we can get an unopened fid. */
 704                 fid = p9_client_walk(dfid, 1, &name, 1);
 705                 if (IS_ERR(fid)) {
 706                         err = PTR_ERR(fid);
 707                         p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 708                                  err);
 709                         fid = NULL;
 710                         goto error;
 711                 }
 712 
 713                 /* instantiate inode and assign the unopened fid to dentry */
 714                 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 715                 if (IS_ERR(inode)) {
 716                         err = PTR_ERR(inode);
 717                         p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
 718                                  err);
 719                         goto error;
 720                 }
 721                 v9fs_fid_add(dentry, fid);
 722                 d_instantiate(dentry, inode);
 723                 fid = NULL;
 724                 err = 0;
 725         } else {
 726                 /* Not in cached mode. No need to populate inode with stat */
 727                 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0);
 728                 if (IS_ERR(inode)) {
 729                         err = PTR_ERR(inode);
 730                         goto error;
 731                 }
 732                 d_instantiate(dentry, inode);
 733         }
 734 
 735 error:
 736         if (fid)
 737                 p9_client_clunk(fid);
 738 
 739         return err;
 740 }
 741 
 742 /**
 743  * v9fs_vfs_link_dotl - create a hardlink for dotl
 744  * @old_dentry: dentry for file to link to
 745  * @dir: inode destination for new link
 746  * @dentry: dentry for link
 747  *
 748  */
 749 
 750 static int
 751 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
 752                 struct dentry *dentry)
 753 {
 754         int err;
 755         struct p9_fid *dfid, *oldfid;
 756         struct v9fs_session_info *v9ses;
 757 
 758         p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %pd, new_name: %pd\n",
 759                  dir->i_ino, old_dentry, dentry);
 760 
 761         v9ses = v9fs_inode2v9ses(dir);
 762         dfid = v9fs_parent_fid(dentry);
 763         if (IS_ERR(dfid))
 764                 return PTR_ERR(dfid);
 765 
 766         oldfid = v9fs_fid_lookup(old_dentry);
 767         if (IS_ERR(oldfid))
 768                 return PTR_ERR(oldfid);
 769 
 770         err = p9_client_link(dfid, oldfid, dentry->d_name.name);
 771 
 772         if (err < 0) {
 773                 p9_debug(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, d_inode(old_dentry));
 786         }
 787         ihold(d_inode(old_dentry));
 788         d_instantiate(dentry, d_inode(old_dentry));
 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  * @omode: 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, umode_t omode,
 803                 dev_t rdev)
 804 {
 805         int err;
 806         kgid_t gid;
 807         const unsigned char *name;
 808         umode_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 posix_acl *dacl = NULL, *pacl = NULL;
 814 
 815         p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %hx MAJOR: %u MINOR: %u\n",
 816                  dir->i_ino, dentry, omode,
 817                  MAJOR(rdev), MINOR(rdev));
 818 
 819         v9ses = v9fs_inode2v9ses(dir);
 820         dfid = v9fs_parent_fid(dentry);
 821         if (IS_ERR(dfid)) {
 822                 err = PTR_ERR(dfid);
 823                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
 824                 dfid = NULL;
 825                 goto error;
 826         }
 827 
 828         gid = v9fs_get_fsgid_for_create(dir);
 829         mode = omode;
 830         /* Update mode based on ACL value */
 831         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
 832         if (err) {
 833                 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n",
 834                          err);
 835                 goto error;
 836         }
 837         name = dentry->d_name.name;
 838 
 839         err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
 840         if (err < 0)
 841                 goto error;
 842 
 843         v9fs_invalidate_inode_attr(dir);
 844         fid = p9_client_walk(dfid, 1, &name, 1);
 845         if (IS_ERR(fid)) {
 846                 err = PTR_ERR(fid);
 847                 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
 848                          err);
 849                 fid = NULL;
 850                 goto error;
 851         }
 852 
 853         /* instantiate inode and assign the unopened fid to the dentry */
 854         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
 855                 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
 856                 if (IS_ERR(inode)) {
 857                         err = PTR_ERR(inode);
 858                         p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
 859                                  err);
 860                         goto error;
 861                 }
 862                 v9fs_set_create_acl(inode, fid, dacl, pacl);
 863                 v9fs_fid_add(dentry, fid);
 864                 d_instantiate(dentry, inode);
 865                 fid = NULL;
 866                 err = 0;
 867         } else {
 868                 /*
 869                  * Not in cached mode. No need to populate inode with stat.
 870                  * socket syscall returns a fd, so we need instantiate
 871                  */
 872                 inode = v9fs_get_inode(dir->i_sb, mode, rdev);
 873                 if (IS_ERR(inode)) {
 874                         err = PTR_ERR(inode);
 875                         goto error;
 876                 }
 877                 v9fs_set_create_acl(inode, fid, dacl, pacl);
 878                 d_instantiate(dentry, inode);
 879         }
 880 error:
 881         if (fid)
 882                 p9_client_clunk(fid);
 883         v9fs_put_acl(dacl, pacl);
 884         return err;
 885 }
 886 
 887 /**
 888  * v9fs_vfs_get_link_dotl - follow a symlink path
 889  * @dentry: dentry for symlink
 890  * @inode: inode for symlink
 891  * @done: destructor for return value
 892  */
 893 
 894 static const char *
 895 v9fs_vfs_get_link_dotl(struct dentry *dentry,
 896                        struct inode *inode,
 897                        struct delayed_call *done)
 898 {
 899         struct p9_fid *fid;
 900         char *target;
 901         int retval;
 902 
 903         if (!dentry)
 904                 return ERR_PTR(-ECHILD);
 905 
 906         p9_debug(P9_DEBUG_VFS, "%pd\n", dentry);
 907 
 908         fid = v9fs_fid_lookup(dentry);
 909         if (IS_ERR(fid))
 910                 return ERR_CAST(fid);
 911         retval = p9_client_readlink(fid, &target);
 912         if (retval)
 913                 return ERR_PTR(retval);
 914         set_delayed_call(done, kfree_link, target);
 915         return target;
 916 }
 917 
 918 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
 919 {
 920         struct p9_stat_dotl *st;
 921         struct v9fs_session_info *v9ses;
 922         unsigned int flags;
 923 
 924         v9ses = v9fs_inode2v9ses(inode);
 925         st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
 926         if (IS_ERR(st))
 927                 return PTR_ERR(st);
 928         /*
 929          * Don't update inode if the file type is different
 930          */
 931         if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
 932                 goto out;
 933 
 934         /*
 935          * We don't want to refresh inode->i_size,
 936          * because we may have cached data
 937          */
 938         flags = (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) ?
 939                 V9FS_STAT2INODE_KEEP_ISIZE : 0;
 940         v9fs_stat2inode_dotl(st, inode, flags);
 941 out:
 942         kfree(st);
 943         return 0;
 944 }
 945 
 946 const struct inode_operations v9fs_dir_inode_operations_dotl = {
 947         .create = v9fs_vfs_create_dotl,
 948         .atomic_open = v9fs_vfs_atomic_open_dotl,
 949         .lookup = v9fs_vfs_lookup,
 950         .link = v9fs_vfs_link_dotl,
 951         .symlink = v9fs_vfs_symlink_dotl,
 952         .unlink = v9fs_vfs_unlink,
 953         .mkdir = v9fs_vfs_mkdir_dotl,
 954         .rmdir = v9fs_vfs_rmdir,
 955         .mknod = v9fs_vfs_mknod_dotl,
 956         .rename = v9fs_vfs_rename,
 957         .getattr = v9fs_vfs_getattr_dotl,
 958         .setattr = v9fs_vfs_setattr_dotl,
 959         .listxattr = v9fs_listxattr,
 960         .get_acl = v9fs_iop_get_acl,
 961 };
 962 
 963 const struct inode_operations v9fs_file_inode_operations_dotl = {
 964         .getattr = v9fs_vfs_getattr_dotl,
 965         .setattr = v9fs_vfs_setattr_dotl,
 966         .listxattr = v9fs_listxattr,
 967         .get_acl = v9fs_iop_get_acl,
 968 };
 969 
 970 const struct inode_operations v9fs_symlink_inode_operations_dotl = {
 971         .get_link = v9fs_vfs_get_link_dotl,
 972         .getattr = v9fs_vfs_getattr_dotl,
 973         .setattr = v9fs_vfs_setattr_dotl,
 974         .listxattr = v9fs_listxattr,
 975 };
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root/fs/9p/vfs_inode_dotl.c

DEFINITIONS
