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 } 456