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 <linux/bvec.h> 12 #include "protocol.h" 13 #include "orangefs-kernel.h" 14 #include "orangefs-bufmap.h" 15 16 static int read_one_page(struct page *page) 17 { 18 int ret; 19 int max_block; 20 ssize_t bytes_read = 0; 21 struct inode *inode = page->mapping->host; 22 const __u32 blocksize = PAGE_SIZE; /* inode->i_blksize */ 23 const __u32 blockbits = PAGE_SHIFT; /* inode->i_blkbits */ 24 struct iov_iter to; 25 struct bio_vec bv = {.bv_page = page, .bv_len = PAGE_SIZE}; 26 27 iov_iter_bvec(&to, ITER_BVEC | READ, &bv, 1, PAGE_SIZE); 28 29 gossip_debug(GOSSIP_INODE_DEBUG, 30 "orangefs_readpage called with page %p\n", 31 page); 32 33 max_block = ((inode->i_size / blocksize) + 1); 34 35 if (page->index < max_block) { 36 loff_t blockptr_offset = (((loff_t) page->index) << blockbits); 37 38 bytes_read = orangefs_inode_read(inode, 39 &to, 40 &blockptr_offset, 41 inode->i_size); 42 } 43 /* this will only zero remaining unread portions of the page data */ 44 iov_iter_zero(~0U, &to); 45 /* takes care of potential aliasing */ 46 flush_dcache_page(page); 47 if (bytes_read < 0) { 48 ret = bytes_read; 49 SetPageError(page); 50 } else { 51 SetPageUptodate(page); 52 if (PageError(page)) 53 ClearPageError(page); 54 ret = 0; 55 } 56 /* unlock the page after the ->readpage() routine completes */ 57 unlock_page(page); 58 return ret; 59 } 60 61 static int orangefs_readpage(struct file *file, struct page *page) 62 { 63 return read_one_page(page); 64 } 65 66 static int orangefs_readpages(struct file *file, 67 struct address_space *mapping, 68 struct list_head *pages, 69 unsigned nr_pages) 70 { 71 int page_idx; 72 int ret; 73 74 gossip_debug(GOSSIP_INODE_DEBUG, "orangefs_readpages called\n"); 75 76 for (page_idx = 0; page_idx < nr_pages; page_idx++) { 77 struct page *page; 78 79 page = list_entry(pages->prev, struct page, lru); 80 list_del(&page->lru); 81 if (!add_to_page_cache(page, 82 mapping, 83 page->index, 84 readahead_gfp_mask(mapping))) { 85 ret = read_one_page(page); 86 gossip_debug(GOSSIP_INODE_DEBUG, 87 "failure adding page to cache, read_one_page returned: %d\n", 88 ret); 89 } else { 90 put_page(page); 91 } 92 } 93 BUG_ON(!list_empty(pages)); 94 return 0; 95 } 96 97 static void orangefs_invalidatepage(struct page *page, 98 unsigned int offset, 99 unsigned int length) 100 { 101 gossip_debug(GOSSIP_INODE_DEBUG, 102 "orangefs_invalidatepage called on page %p " 103 "(offset is %u)\n", 104 page, 105 offset); 106 107 ClearPageUptodate(page); 108 ClearPageMappedToDisk(page); 109 return; 110 111 } 112 113 static int orangefs_releasepage(struct page *page, gfp_t foo) 114 { 115 gossip_debug(GOSSIP_INODE_DEBUG, 116 "orangefs_releasepage called on page %p\n", 117 page); 118 return 0; 119 } 120 121 /* 122 * Having a direct_IO entry point in the address_space_operations 123 * struct causes the kernel to allows us to use O_DIRECT on 124 * open. Nothing will ever call this thing, but in the future we 125 * will need to be able to use O_DIRECT on open in order to support 126 * AIO. Modeled after NFS, they do this too. 127 */ 128 129 static ssize_t orangefs_direct_IO(struct kiocb *iocb, 130 struct iov_iter *iter) 131 { 132 gossip_debug(GOSSIP_INODE_DEBUG, 133 "orangefs_direct_IO: %pD\n", 134 iocb->ki_filp); 135 136 return -EINVAL; 137 } 138 139 /** ORANGEFS2 implementation of address space operations */ 140 const struct address_space_operations orangefs_address_operations = { 141 .readpage = orangefs_readpage, 142 .readpages = orangefs_readpages, 143 .invalidatepage = orangefs_invalidatepage, 144 .releasepage = orangefs_releasepage, 145 .direct_IO = orangefs_direct_IO, 146 }; 147 148 static int orangefs_setattr_size(struct inode *inode, struct iattr *iattr) 149 { 150 struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode); 151 struct orangefs_kernel_op_s *new_op; 152 loff_t orig_size; 153 int ret = -EINVAL; 154 155 gossip_debug(GOSSIP_INODE_DEBUG, 156 "%s: %pU: Handle is %pU | fs_id %d | size is %llu\n", 157 __func__, 158 get_khandle_from_ino(inode), 159 &orangefs_inode->refn.khandle, 160 orangefs_inode->refn.fs_id, 161 iattr->ia_size); 162 163 /* Ensure that we have a up to date size, so we know if it changed. */ 164 ret = orangefs_inode_getattr(inode, 0, 1); 165 if (ret == -ESTALE) 166 ret = -EIO; 167 if (ret) { 168 gossip_err("%s: orangefs_inode_getattr failed, ret:%d:.\n", 169 __func__, ret); 170 return ret; 171 } 172 orig_size = i_size_read(inode); 173 174 truncate_setsize(inode, iattr->ia_size); 175 176 new_op = op_alloc(ORANGEFS_VFS_OP_TRUNCATE); 177 if (!new_op) 178 return -ENOMEM; 179 180 new_op->upcall.req.truncate.refn = orangefs_inode->refn; 181 new_op->upcall.req.truncate.size = (__s64) iattr->ia_size; 182 183 ret = service_operation(new_op, __func__, 184 get_interruptible_flag(inode)); 185 186 /* 187 * the truncate has no downcall members to retrieve, but 188 * the status value tells us if it went through ok or not 189 */ 190 gossip_debug(GOSSIP_INODE_DEBUG, 191 "orangefs: orangefs_truncate got return value of %d\n", 192 ret); 193 194 op_release(new_op); 195 196 if (ret != 0) 197 return ret; 198 199 if (orig_size != i_size_read(inode)) 200 iattr->ia_valid |= ATTR_CTIME | ATTR_MTIME; 201 202 return ret; 203 } 204 205 /* 206 * Change attributes of an object referenced by dentry. 207 */ 208 int orangefs_setattr(struct dentry *dentry, struct iattr *iattr) 209 { 210 int ret = -EINVAL; 211 struct inode *inode = dentry->d_inode; 212 213 gossip_debug(GOSSIP_INODE_DEBUG, 214 "orangefs_setattr: called on %pd\n", 215 dentry); 216 217 ret = setattr_prepare(dentry, iattr); 218 if (ret) 219 goto out; 220 221 if ((iattr->ia_valid & ATTR_SIZE) && 222 iattr->ia_size != i_size_read(inode)) { 223 ret = orangefs_setattr_size(inode, iattr); 224 if (ret) 225 goto out; 226 } 227 228 setattr_copy(inode, iattr); 229 mark_inode_dirty(inode); 230 231 ret = orangefs_inode_setattr(inode, iattr); 232 gossip_debug(GOSSIP_INODE_DEBUG, 233 "orangefs_setattr: inode_setattr returned %d\n", 234 ret); 235 236 if (!ret && (iattr->ia_valid & ATTR_MODE)) 237 /* change mod on a file that has ACLs */ 238 ret = posix_acl_chmod(inode, inode->i_mode); 239 240 out: 241 gossip_debug(GOSSIP_INODE_DEBUG, "orangefs_setattr: returning %d\n", ret); 242 return ret; 243 } 244 245 /* 246 * Obtain attributes of an object given a dentry 247 */ 248 int orangefs_getattr(const struct path *path, struct kstat *stat, 249 u32 request_mask, unsigned int flags) 250 { 251 int ret = -ENOENT; 252 struct inode *inode = path->dentry->d_inode; 253 struct orangefs_inode_s *orangefs_inode = NULL; 254 255 gossip_debug(GOSSIP_INODE_DEBUG, 256 "orangefs_getattr: called on %pd\n", 257 path->dentry); 258 259 ret = orangefs_inode_getattr(inode, 0, 0); 260 if (ret == 0) { 261 generic_fillattr(inode, stat); 262 263 /* override block size reported to stat */ 264 orangefs_inode = ORANGEFS_I(inode); 265 stat->blksize = orangefs_inode->blksize; 266 } 267 return ret; 268 } 269 270 int orangefs_permission(struct inode *inode, int mask) 271 { 272 int ret; 273 274 if (mask & MAY_NOT_BLOCK) 275 return -ECHILD; 276 277 gossip_debug(GOSSIP_INODE_DEBUG, "%s: refreshing\n", __func__); 278 279 /* Make sure the permission (and other common attrs) are up to date. */ 280 ret = orangefs_inode_getattr(inode, 0, 0); 281 if (ret < 0) 282 return ret; 283 284 return generic_permission(inode, mask); 285 } 286 287 /* ORANGEDS2 implementation of VFS inode operations for files */ 288 const struct inode_operations orangefs_file_inode_operations = { 289 .get_acl = orangefs_get_acl, 290 .set_acl = orangefs_set_acl, 291 .setattr = orangefs_setattr, 292 .getattr = orangefs_getattr, 293 .listxattr = orangefs_listxattr, 294 .permission = orangefs_permission, 295 }; 296 297 static int orangefs_init_iops(struct inode *inode) 298 { 299 inode->i_mapping->a_ops = &orangefs_address_operations; 300 301 switch (inode->i_mode & S_IFMT) { 302 case S_IFREG: 303 inode->i_op = &orangefs_file_inode_operations; 304 inode->i_fop = &orangefs_file_operations; 305 inode->i_blkbits = PAGE_SHIFT; 306 break; 307 case S_IFLNK: 308 inode->i_op = &orangefs_symlink_inode_operations; 309 break; 310 case S_IFDIR: 311 inode->i_op = &orangefs_dir_inode_operations; 312 inode->i_fop = &orangefs_dir_operations; 313 break; 314 default: 315 gossip_debug(GOSSIP_INODE_DEBUG, 316 "%s: unsupported mode\n", 317 __func__); 318 return -EINVAL; 319 } 320 321 return 0; 322 } 323 324 /* 325 * Given a ORANGEFS object identifier (fsid, handle), convert it into a ino_t type 326 * that will be used as a hash-index from where the handle will 327 * be searched for in the VFS hash table of inodes. 328 */ 329 static inline ino_t orangefs_handle_hash(struct orangefs_object_kref *ref) 330 { 331 if (!ref) 332 return 0; 333 return orangefs_khandle_to_ino(&(ref->khandle)); 334 } 335 336 /* 337 * Called to set up an inode from iget5_locked. 338 */ 339 static int orangefs_set_inode(struct inode *inode, void *data) 340 { 341 struct orangefs_object_kref *ref = (struct orangefs_object_kref *) data; 342 ORANGEFS_I(inode)->refn.fs_id = ref->fs_id; 343 ORANGEFS_I(inode)->refn.khandle = ref->khandle; 344 return 0; 345 } 346 347 /* 348 * Called to determine if handles match. 349 */ 350 static int orangefs_test_inode(struct inode *inode, void *data) 351 { 352 struct orangefs_object_kref *ref = (struct orangefs_object_kref *) data; 353 struct orangefs_inode_s *orangefs_inode = NULL; 354 355 orangefs_inode = ORANGEFS_I(inode); 356 return (!ORANGEFS_khandle_cmp(&(orangefs_inode->refn.khandle), &(ref->khandle)) 357 && orangefs_inode->refn.fs_id == ref->fs_id); 358 } 359 360 /* 361 * Front-end to lookup the inode-cache maintained by the VFS using the ORANGEFS 362 * file handle. 363 * 364 * @sb: the file system super block instance. 365 * @ref: The ORANGEFS object for which we are trying to locate an inode structure. 366 */ 367 struct inode *orangefs_iget(struct super_block *sb, struct orangefs_object_kref *ref) 368 { 369 struct inode *inode = NULL; 370 unsigned long hash; 371 int error; 372 373 hash = orangefs_handle_hash(ref); 374 inode = iget5_locked(sb, hash, orangefs_test_inode, orangefs_set_inode, ref); 375 if (!inode || !(inode->i_state & I_NEW)) 376 return inode; 377 378 error = orangefs_inode_getattr(inode, 1, 1); 379 if (error) { 380 iget_failed(inode); 381 return ERR_PTR(error); 382 } 383 384 inode->i_ino = hash; /* needed for stat etc */ 385 orangefs_init_iops(inode); 386 unlock_new_inode(inode); 387 388 gossip_debug(GOSSIP_INODE_DEBUG, 389 "iget handle %pU, fsid %d hash %ld i_ino %lu\n", 390 &ref->khandle, 391 ref->fs_id, 392 hash, 393 inode->i_ino); 394 395 return inode; 396 } 397 398 /* 399 * Allocate an inode for a newly created file and insert it into the inode hash. 400 */ 401 struct inode *orangefs_new_inode(struct super_block *sb, struct inode *dir, 402 int mode, dev_t dev, struct orangefs_object_kref *ref) 403 { 404 unsigned long hash = orangefs_handle_hash(ref); 405 struct inode *inode; 406 int error; 407 408 gossip_debug(GOSSIP_INODE_DEBUG, 409 "%s:(sb is %p | MAJOR(dev)=%u | MINOR(dev)=%u mode=%o)\n", 410 __func__, 411 sb, 412 MAJOR(dev), 413 MINOR(dev), 414 mode); 415 416 inode = new_inode(sb); 417 if (!inode) 418 return NULL; 419 420 orangefs_set_inode(inode, ref); 421 inode->i_ino = hash; /* needed for stat etc */ 422 423 error = orangefs_inode_getattr(inode, 1, 1); 424 if (error) 425 goto out_iput; 426 427 orangefs_init_iops(inode); 428 429 inode->i_mode = mode; 430 inode->i_uid = current_fsuid(); 431 inode->i_gid = current_fsgid(); 432 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); 433 inode->i_size = PAGE_SIZE; 434 inode->i_rdev = dev; 435 436 error = insert_inode_locked4(inode, hash, orangefs_test_inode, ref); 437 if (error < 0) 438 goto out_iput; 439 440 gossip_debug(GOSSIP_INODE_DEBUG, 441 "Initializing ACL's for inode %pU\n", 442 get_khandle_from_ino(inode)); 443 orangefs_init_acl(inode, dir); 444 return inode; 445 446 out_iput: 447 iput(inode); 448 return ERR_PTR(error); 449 } 450