fs/orangefs/inode.c

   1 /*
   2  * (C) 2001 Clemson University and The University of Chicago
   3  *
   4  * See COPYING in top-level directory.
   5  */
   6
   7 /*
   8  *  Linux VFS inode operations.
   9  */
  10
  11 #include "protocol.h"
  12 #include "orangefs-kernel.h"
  13 #include "orangefs-bufmap.h"
  14
  15 static int read_one_page(struct page *page)
  16 {
  17         int ret;
  18         int max_block;
  19         ssize_t bytes_read = 0;
  20         struct inode *inode = page->mapping->host;
  21         const __u32 blocksize = PAGE_SIZE;      /* inode->i_blksize */
  22         const __u32 blockbits = PAGE_SHIFT;     /* inode->i_blkbits */
  23         struct iov_iter to;
  24         struct bio_vec bv = {.bv_page = page, .bv_len = PAGE_SIZE};
  25
  26         iov_iter_bvec(&to, ITER_BVEC | READ, &bv, 1, PAGE_SIZE);
  27
  28         gossip_debug(GOSSIP_INODE_DEBUG,
  29                     "orangefs_readpage called with page %p\n",
  30                      page);
  31
  32         max_block = ((inode->i_size / blocksize) + 1);
  33
  34         if (page->index < max_block) {
  35                 loff_t blockptr_offset = (((loff_t) page->index) << blockbits);
  36
  37                 bytes_read = orangefs_inode_read(inode,
  38                                                  &to,
  39                                                  &blockptr_offset,
  40                                                  inode->i_size);
  41         }
  42         /* this will only zero remaining unread portions of the page data */
  43         iov_iter_zero(~0U, &to);
  44         /* takes care of potential aliasing */
  45         flush_dcache_page(page);
  46         if (bytes_read < 0) {
  47                 ret = bytes_read;
  48                 SetPageError(page);
  49         } else {
  50                 SetPageUptodate(page);
  51                 if (PageError(page))
  52                         ClearPageError(page);
  53                 ret = 0;
  54         }
  55         /* unlock the page after the ->readpage() routine completes */
  56         unlock_page(page);
  57         return ret;
  58 }
  59
  60 static int orangefs_readpage(struct file *file, struct page *page)
  61 {
  62         return read_one_page(page);
  63 }
  64
  65 static int orangefs_readpages(struct file *file,
  66                            struct address_space *mapping,
  67                            struct list_head *pages,
  68                            unsigned nr_pages)
  69 {
  70         int page_idx;
  71         int ret;
  72
  73         gossip_debug(GOSSIP_INODE_DEBUG, "orangefs_readpages called\n");
  74
  75         for (page_idx = 0; page_idx < nr_pages; page_idx++) {
  76                 struct page *page;
  77
  78                 page = list_entry(pages->prev, struct page, lru);
  79                 list_del(&page->lru);
  80                 if (!add_to_page_cache(page,
  81                                        mapping,
  82                                        page->index,
  83                                        readahead_gfp_mask(mapping))) {
  84                         ret = read_one_page(page);
  85                         gossip_debug(GOSSIP_INODE_DEBUG,
  86                                 "failure adding page to cache, read_one_page returned: %d\n",
  87                                 ret);
  88               } else {
  89                         put_page(page);
  90               }
  91         }
  92         BUG_ON(!list_empty(pages));
  93         return 0;
  94 }
  95
  96 static void orangefs_invalidatepage(struct page *page,
  97                                  unsigned int offset,
  98                                  unsigned int length)
  99 {
 100         gossip_debug(GOSSIP_INODE_DEBUG,
 101                      "orangefs_invalidatepage called on page %p "
 102                      "(offset is %u)\n",
 103                      page,
 104                      offset);
 105
 106         ClearPageUptodate(page);
 107         ClearPageMappedToDisk(page);
 108         return;
 109
 110 }
 111
 112 static int orangefs_releasepage(struct page *page, gfp_t foo)
 113 {
 114         gossip_debug(GOSSIP_INODE_DEBUG,
 115                      "orangefs_releasepage called on page %p\n",
 116                      page);
 117         return 0;
 118 }
 119
 120 /*
 121  * Having a direct_IO entry point in the address_space_operations
 122  * struct causes the kernel to allows us to use O_DIRECT on
 123  * open. Nothing will ever call this thing, but in the future we
 124  * will need to be able to use O_DIRECT on open in order to support
 125  * AIO. Modeled after NFS, they do this too.
 126  */
 127
 128 static ssize_t orangefs_direct_IO(struct kiocb *iocb,
 129                                   struct iov_iter *iter)
 130 {
 131         gossip_debug(GOSSIP_INODE_DEBUG,
 132                      "orangefs_direct_IO: %pD\n",
 133                      iocb->ki_filp);
 134
 135         return -EINVAL;
 136 }
 137
 138 struct backing_dev_info orangefs_backing_dev_info = {
 139         .name = "orangefs",
 140         .ra_pages = 0,
 141         .capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK,
 142 };
 143
 144 /** ORANGEFS2 implementation of address space operations */
 145 const struct address_space_operations orangefs_address_operations = {
 146         .readpage = orangefs_readpage,
 147         .readpages = orangefs_readpages,
 148         .invalidatepage = orangefs_invalidatepage,
 149         .releasepage = orangefs_releasepage,
 150         .direct_IO = orangefs_direct_IO,
 151 };
 152
 153 static int orangefs_setattr_size(struct inode *inode, struct iattr *iattr)
 154 {
 155         struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
 156         struct orangefs_kernel_op_s *new_op;
 157         loff_t orig_size;
 158         int ret = -EINVAL;
 159
 160         gossip_debug(GOSSIP_INODE_DEBUG,
 161                      "%s: %pU: Handle is %pU | fs_id %d | size is %llu\n",
 162                      __func__,
 163                      get_khandle_from_ino(inode),
 164                      &orangefs_inode->refn.khandle,
 165                      orangefs_inode->refn.fs_id,
 166                      iattr->ia_size);
 167
 168         /* Ensure that we have a up to date size, so we know if it changed. */
 169         ret = orangefs_inode_getattr(inode, 0, 1);
 170         if (ret == -ESTALE)
 171                 ret = -EIO;
 172         if (ret) {
 173                 gossip_err("%s: orangefs_inode_getattr failed, ret:%d:.\n",
 174                     __func__, ret);
 175                 return ret;
 176         }
 177         orig_size = i_size_read(inode);
 178
 179         truncate_setsize(inode, iattr->ia_size);
 180
 181         new_op = op_alloc(ORANGEFS_VFS_OP_TRUNCATE);
 182         if (!new_op)
 183                 return -ENOMEM;
 184
 185         new_op->upcall.req.truncate.refn = orangefs_inode->refn;
 186         new_op->upcall.req.truncate.size = (__s64) iattr->ia_size;
 187
 188         ret = service_operation(new_op, __func__,
 189                                 get_interruptible_flag(inode));
 190
 191         /*
 192          * the truncate has no downcall members to retrieve, but
 193          * the status value tells us if it went through ok or not
 194          */
 195         gossip_debug(GOSSIP_INODE_DEBUG,
 196                      "orangefs: orangefs_truncate got return value of %d\n",
 197                      ret);
 198
 199         op_release(new_op);
 200
 201         if (ret != 0)
 202                 return ret;
 203
 204         if (orig_size != i_size_read(inode))
 205                 iattr->ia_valid |= ATTR_CTIME | ATTR_MTIME;
 206
 207         return ret;
 208 }
 209
 210 /*
 211  * Change attributes of an object referenced by dentry.
 212  */
 213 int orangefs_setattr(struct dentry *dentry, struct iattr *iattr)
 214 {
 215         int ret = -EINVAL;
 216         struct inode *inode = dentry->d_inode;
 217
 218         gossip_debug(GOSSIP_INODE_DEBUG,
 219                      "orangefs_setattr: called on %pd\n",
 220                      dentry);
 221
 222         ret = setattr_prepare(dentry, iattr);
 223         if (ret)
 224                 goto out;
 225
 226         if ((iattr->ia_valid & ATTR_SIZE) &&
 227             iattr->ia_size != i_size_read(inode)) {
 228                 ret = orangefs_setattr_size(inode, iattr);
 229                 if (ret)
 230                         goto out;
 231         }
 232
 233         setattr_copy(inode, iattr);
 234         mark_inode_dirty(inode);
 235
 236         ret = orangefs_inode_setattr(inode, iattr);
 237         gossip_debug(GOSSIP_INODE_DEBUG,
 238                      "orangefs_setattr: inode_setattr returned %d\n",
 239                      ret);
 240
 241         if (!ret && (iattr->ia_valid & ATTR_MODE))
 242                 /* change mod on a file that has ACLs */
 243                 ret = posix_acl_chmod(inode, inode->i_mode);
 244
 245 out:
 246         gossip_debug(GOSSIP_INODE_DEBUG, "orangefs_setattr: returning %d\n", ret);
 247         return ret;
 248 }
 249
 250 /*
 251  * Obtain attributes of an object given a dentry
 252  */
 253 int orangefs_getattr(struct vfsmount *mnt,
 254                   struct dentry *dentry,
 255                   struct kstat *kstat)
 256 {
 257         int ret = -ENOENT;
 258         struct inode *inode = dentry->d_inode;
 259         struct orangefs_inode_s *orangefs_inode = NULL;
 260
 261         gossip_debug(GOSSIP_INODE_DEBUG,
 262                      "orangefs_getattr: called on %pd\n",
 263                      dentry);
 264
 265         ret = orangefs_inode_getattr(inode, 0, 0);
 266         if (ret == 0) {
 267                 generic_fillattr(inode, kstat);
 268
 269                 /* override block size reported to stat */
 270                 orangefs_inode = ORANGEFS_I(inode);
 271                 kstat->blksize = orangefs_inode->blksize;
 272         }
 273         return ret;
 274 }
 275
 276 int orangefs_permission(struct inode *inode, int mask)
 277 {
 278         int ret;
 279
 280         if (mask & MAY_NOT_BLOCK)
 281                 return -ECHILD;
 282
 283         gossip_debug(GOSSIP_INODE_DEBUG, "%s: refreshing\n", __func__);
 284
 285         /* Make sure the permission (and other common attrs) are up to date. */
 286         ret = orangefs_inode_getattr(inode, 0, 0);
 287         if (ret < 0)
 288                 return ret;
 289
 290         return generic_permission(inode, mask);
 291 }
 292
 293 /* ORANGEDS2 implementation of VFS inode operations for files */
 294 const struct inode_operations orangefs_file_inode_operations = {
 295         .get_acl = orangefs_get_acl,
 296         .set_acl = orangefs_set_acl,
 297         .setattr = orangefs_setattr,
 298         .getattr = orangefs_getattr,
 299         .listxattr = orangefs_listxattr,
 300         .permission = orangefs_permission,
 301 };
 302
 303 static int orangefs_init_iops(struct inode *inode)
 304 {
 305         inode->i_mapping->a_ops = &orangefs_address_operations;
 306
 307         switch (inode->i_mode & S_IFMT) {
 308         case S_IFREG:
 309                 inode->i_op = &orangefs_file_inode_operations;
 310                 inode->i_fop = &orangefs_file_operations;
 311                 inode->i_blkbits = PAGE_SHIFT;
 312                 break;
 313         case S_IFLNK:
 314                 inode->i_op = &orangefs_symlink_inode_operations;
 315                 break;
 316         case S_IFDIR:
 317                 inode->i_op = &orangefs_dir_inode_operations;
 318                 inode->i_fop = &orangefs_dir_operations;
 319                 break;
 320         default:
 321                 gossip_debug(GOSSIP_INODE_DEBUG,
 322                              "%s: unsupported mode\n",
 323                              __func__);
 324                 return -EINVAL;
 325         }
 326
 327         return 0;
 328 }
 329
 330 /*
 331  * Given a ORANGEFS object identifier (fsid, handle), convert it into a ino_t type
 332  * that will be used as a hash-index from where the handle will
 333  * be searched for in the VFS hash table of inodes.
 334  */
 335 static inline ino_t orangefs_handle_hash(struct orangefs_object_kref *ref)
 336 {
 337         if (!ref)
 338                 return 0;
 339         return orangefs_khandle_to_ino(&(ref->khandle));
 340 }
 341
 342 /*
 343  * Called to set up an inode from iget5_locked.
 344  */
 345 static int orangefs_set_inode(struct inode *inode, void *data)
 346 {
 347         struct orangefs_object_kref *ref = (struct orangefs_object_kref *) data;
 348         ORANGEFS_I(inode)->refn.fs_id = ref->fs_id;
 349         ORANGEFS_I(inode)->refn.khandle = ref->khandle;
 350         return 0;
 351 }
 352
 353 /*
 354  * Called to determine if handles match.
 355  */
 356 static int orangefs_test_inode(struct inode *inode, void *data)
 357 {
 358         struct orangefs_object_kref *ref = (struct orangefs_object_kref *) data;
 359         struct orangefs_inode_s *orangefs_inode = NULL;
 360
 361         orangefs_inode = ORANGEFS_I(inode);
 362         return (!ORANGEFS_khandle_cmp(&(orangefs_inode->refn.khandle), &(ref->khandle))
 363                 && orangefs_inode->refn.fs_id == ref->fs_id);
 364 }
 365
 366 /*
 367  * Front-end to lookup the inode-cache maintained by the VFS using the ORANGEFS
 368  * file handle.
 369  *
 370  * @sb: the file system super block instance.
 371  * @ref: The ORANGEFS object for which we are trying to locate an inode structure.
 372  */
 373 struct inode *orangefs_iget(struct super_block *sb, struct orangefs_object_kref *ref)
 374 {
 375         struct inode *inode = NULL;
 376         unsigned long hash;
 377         int error;
 378
 379         hash = orangefs_handle_hash(ref);
 380         inode = iget5_locked(sb, hash, orangefs_test_inode, orangefs_set_inode, ref);
 381         if (!inode || !(inode->i_state & I_NEW))
 382                 return inode;
 383
 384         error = orangefs_inode_getattr(inode, 1, 1);
 385         if (error) {
 386                 iget_failed(inode);
 387                 return ERR_PTR(error);
 388         }
 389
 390         inode->i_ino = hash;    /* needed for stat etc */
 391         orangefs_init_iops(inode);
 392         unlock_new_inode(inode);
 393
 394         gossip_debug(GOSSIP_INODE_DEBUG,
 395                      "iget handle %pU, fsid %d hash %ld i_ino %lu\n",
 396                      &ref->khandle,
 397                      ref->fs_id,
 398                      hash,
 399                      inode->i_ino);
 400
 401         return inode;
 402 }
 403
 404 /*
 405  * Allocate an inode for a newly created file and insert it into the inode hash.
 406  */
 407 struct inode *orangefs_new_inode(struct super_block *sb, struct inode *dir,
 408                 int mode, dev_t dev, struct orangefs_object_kref *ref)
 409 {
 410         unsigned long hash = orangefs_handle_hash(ref);
 411         struct inode *inode;
 412         int error;
 413
 414         gossip_debug(GOSSIP_INODE_DEBUG,
 415                      "%s:(sb is %p | MAJOR(dev)=%u | MINOR(dev)=%u mode=%o)\n",
 416                      __func__,
 417                      sb,
 418                      MAJOR(dev),
 419                      MINOR(dev),
 420                      mode);
 421
 422         inode = new_inode(sb);
 423         if (!inode)
 424                 return NULL;
 425
 426         orangefs_set_inode(inode, ref);
 427         inode->i_ino = hash;    /* needed for stat etc */
 428
 429         error = orangefs_inode_getattr(inode, 1, 1);
 430         if (error)
 431                 goto out_iput;
 432
 433         orangefs_init_iops(inode);
 434
 435         inode->i_mode = mode;
 436         inode->i_uid = current_fsuid();
 437         inode->i_gid = current_fsgid();
 438         inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
 439         inode->i_size = PAGE_SIZE;
 440         inode->i_rdev = dev;
 441
 442         error = insert_inode_locked4(inode, hash, orangefs_test_inode, ref);
 443         if (error < 0)
 444                 goto out_iput;
 445
 446         gossip_debug(GOSSIP_INODE_DEBUG,
 447                      "Initializing ACL's for inode %pU\n",
 448                      get_khandle_from_ino(inode));
 449         orangefs_init_acl(inode, dir);
 450         return inode;
 451
 452 out_iput:
 453         iput(inode);
 454         return ERR_PTR(error);
 455 }