1 #include <linux/ceph/ceph_debug.h> 2 3 #include <linux/module.h> 4 #include <linux/sched.h> 5 #include <linux/slab.h> 6 #include <linux/file.h> 7 #include <linux/mount.h> 8 #include <linux/namei.h> 9 #include <linux/writeback.h> 10 #include <linux/aio.h> 11 #include <linux/falloc.h> 12 13 #include "super.h" 14 #include "mds_client.h" 15 #include "cache.h" 16 17 /* 18 * Ceph file operations 19 * 20 * Implement basic open/close functionality, and implement 21 * read/write. 22 * 23 * We implement three modes of file I/O: 24 * - buffered uses the generic_file_aio_{read,write} helpers 25 * 26 * - synchronous is used when there is multi-client read/write 27 * sharing, avoids the page cache, and synchronously waits for an 28 * ack from the OSD. 29 * 30 * - direct io takes the variant of the sync path that references 31 * user pages directly. 32 * 33 * fsync() flushes and waits on dirty pages, but just queues metadata 34 * for writeback: since the MDS can recover size and mtime there is no 35 * need to wait for MDS acknowledgement. 36 */ 37 38 39 /* 40 * Prepare an open request. Preallocate ceph_cap to avoid an 41 * inopportune ENOMEM later. 42 */ 43 static struct ceph_mds_request * 44 prepare_open_request(struct super_block *sb, int flags, int create_mode) 45 { 46 struct ceph_fs_client *fsc = ceph_sb_to_client(sb); 47 struct ceph_mds_client *mdsc = fsc->mdsc; 48 struct ceph_mds_request *req; 49 int want_auth = USE_ANY_MDS; 50 int op = (flags & O_CREAT) ? CEPH_MDS_OP_CREATE : CEPH_MDS_OP_OPEN; 51 52 if (flags & (O_WRONLY|O_RDWR|O_CREAT|O_TRUNC)) 53 want_auth = USE_AUTH_MDS; 54 55 req = ceph_mdsc_create_request(mdsc, op, want_auth); 56 if (IS_ERR(req)) 57 goto out; 58 req->r_fmode = ceph_flags_to_mode(flags); 59 req->r_args.open.flags = cpu_to_le32(flags); 60 req->r_args.open.mode = cpu_to_le32(create_mode); 61 out: 62 return req; 63 } 64 65 /* 66 * initialize private struct file data. 67 * if we fail, clean up by dropping fmode reference on the ceph_inode 68 */ 69 static int ceph_init_file(struct inode *inode, struct file *file, int fmode) 70 { 71 struct ceph_file_info *cf; 72 int ret = 0; 73 struct ceph_inode_info *ci = ceph_inode(inode); 74 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb); 75 struct ceph_mds_client *mdsc = fsc->mdsc; 76 77 switch (inode->i_mode & S_IFMT) { 78 case S_IFREG: 79 /* First file open request creates the cookie, we want to keep 80 * this cookie around for the filetime of the inode as not to 81 * have to worry about fscache register / revoke / operation 82 * races. 83 * 84 * Also, if we know the operation is going to invalidate data 85 * (non readonly) just nuke the cache right away. 86 */ 87 ceph_fscache_register_inode_cookie(mdsc->fsc, ci); 88 if ((fmode & CEPH_FILE_MODE_WR)) 89 ceph_fscache_invalidate(inode); 90 case S_IFDIR: 91 dout("init_file %p %p 0%o (regular)\n", inode, file, 92 inode->i_mode); 93 cf = kmem_cache_alloc(ceph_file_cachep, GFP_NOFS | __GFP_ZERO); 94 if (cf == NULL) { 95 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */ 96 return -ENOMEM; 97 } 98 cf->fmode = fmode; 99 cf->next_offset = 2; 100 file->private_data = cf; 101 BUG_ON(inode->i_fop->release != ceph_release); 102 break; 103 104 case S_IFLNK: 105 dout("init_file %p %p 0%o (symlink)\n", inode, file, 106 inode->i_mode); 107 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */ 108 break; 109 110 default: 111 dout("init_file %p %p 0%o (special)\n", inode, file, 112 inode->i_mode); 113 /* 114 * we need to drop the open ref now, since we don't 115 * have .release set to ceph_release. 116 */ 117 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */ 118 BUG_ON(inode->i_fop->release == ceph_release); 119 120 /* call the proper open fop */ 121 ret = inode->i_fop->open(inode, file); 122 } 123 return ret; 124 } 125 126 /* 127 * If we already have the requisite capabilities, we can satisfy 128 * the open request locally (no need to request new caps from the 129 * MDS). We do, however, need to inform the MDS (asynchronously) 130 * if our wanted caps set expands. 131 */ 132 int ceph_open(struct inode *inode, struct file *file) 133 { 134 struct ceph_inode_info *ci = ceph_inode(inode); 135 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb); 136 struct ceph_mds_client *mdsc = fsc->mdsc; 137 struct ceph_mds_request *req; 138 struct ceph_file_info *cf = file->private_data; 139 struct inode *parent_inode = NULL; 140 int err; 141 int flags, fmode, wanted; 142 143 if (cf) { 144 dout("open file %p is already opened\n", file); 145 return 0; 146 } 147 148 /* filter out O_CREAT|O_EXCL; vfs did that already. yuck. */ 149 flags = file->f_flags & ~(O_CREAT|O_EXCL); 150 if (S_ISDIR(inode->i_mode)) 151 flags = O_DIRECTORY; /* mds likes to know */ 152 153 dout("open inode %p ino %llx.%llx file %p flags %d (%d)\n", inode, 154 ceph_vinop(inode), file, flags, file->f_flags); 155 fmode = ceph_flags_to_mode(flags); 156 wanted = ceph_caps_for_mode(fmode); 157 158 /* snapped files are read-only */ 159 if (ceph_snap(inode) != CEPH_NOSNAP && (file->f_mode & FMODE_WRITE)) 160 return -EROFS; 161 162 /* trivially open snapdir */ 163 if (ceph_snap(inode) == CEPH_SNAPDIR) { 164 spin_lock(&ci->i_ceph_lock); 165 __ceph_get_fmode(ci, fmode); 166 spin_unlock(&ci->i_ceph_lock); 167 return ceph_init_file(inode, file, fmode); 168 } 169 170 /* 171 * No need to block if we have caps on the auth MDS (for 172 * write) or any MDS (for read). Update wanted set 173 * asynchronously. 174 */ 175 spin_lock(&ci->i_ceph_lock); 176 if (__ceph_is_any_real_caps(ci) && 177 (((fmode & CEPH_FILE_MODE_WR) == 0) || ci->i_auth_cap)) { 178 int mds_wanted = __ceph_caps_mds_wanted(ci); 179 int issued = __ceph_caps_issued(ci, NULL); 180 181 dout("open %p fmode %d want %s issued %s using existing\n", 182 inode, fmode, ceph_cap_string(wanted), 183 ceph_cap_string(issued)); 184 __ceph_get_fmode(ci, fmode); 185 spin_unlock(&ci->i_ceph_lock); 186 187 /* adjust wanted? */ 188 if ((issued & wanted) != wanted && 189 (mds_wanted & wanted) != wanted && 190 ceph_snap(inode) != CEPH_SNAPDIR) 191 ceph_check_caps(ci, 0, NULL); 192 193 return ceph_init_file(inode, file, fmode); 194 } else if (ceph_snap(inode) != CEPH_NOSNAP && 195 (ci->i_snap_caps & wanted) == wanted) { 196 __ceph_get_fmode(ci, fmode); 197 spin_unlock(&ci->i_ceph_lock); 198 return ceph_init_file(inode, file, fmode); 199 } 200 201 spin_unlock(&ci->i_ceph_lock); 202 203 dout("open fmode %d wants %s\n", fmode, ceph_cap_string(wanted)); 204 req = prepare_open_request(inode->i_sb, flags, 0); 205 if (IS_ERR(req)) { 206 err = PTR_ERR(req); 207 goto out; 208 } 209 req->r_inode = inode; 210 ihold(inode); 211 212 req->r_num_caps = 1; 213 if (flags & O_CREAT) 214 parent_inode = ceph_get_dentry_parent_inode(file->f_dentry); 215 err = ceph_mdsc_do_request(mdsc, parent_inode, req); 216 iput(parent_inode); 217 if (!err) 218 err = ceph_init_file(inode, file, req->r_fmode); 219 ceph_mdsc_put_request(req); 220 dout("open result=%d on %llx.%llx\n", err, ceph_vinop(inode)); 221 out: 222 return err; 223 } 224 225 226 /* 227 * Do a lookup + open with a single request. If we get a non-existent 228 * file or symlink, return 1 so the VFS can retry. 229 */ 230 int ceph_atomic_open(struct inode *dir, struct dentry *dentry, 231 struct file *file, unsigned flags, umode_t mode, 232 int *opened) 233 { 234 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); 235 struct ceph_mds_client *mdsc = fsc->mdsc; 236 struct ceph_mds_request *req; 237 struct dentry *dn; 238 int err; 239 240 dout("atomic_open %p dentry %p '%.*s' %s flags %d mode 0%o\n", 241 dir, dentry, dentry->d_name.len, dentry->d_name.name, 242 d_unhashed(dentry) ? "unhashed" : "hashed", flags, mode); 243 244 if (dentry->d_name.len > NAME_MAX) 245 return -ENAMETOOLONG; 246 247 err = ceph_init_dentry(dentry); 248 if (err < 0) 249 return err; 250 251 /* do the open */ 252 req = prepare_open_request(dir->i_sb, flags, mode); 253 if (IS_ERR(req)) 254 return PTR_ERR(req); 255 req->r_dentry = dget(dentry); 256 req->r_num_caps = 2; 257 if (flags & O_CREAT) { 258 req->r_dentry_drop = CEPH_CAP_FILE_SHARED; 259 req->r_dentry_unless = CEPH_CAP_FILE_EXCL; 260 } 261 req->r_locked_dir = dir; /* caller holds dir->i_mutex */ 262 err = ceph_mdsc_do_request(mdsc, 263 (flags & (O_CREAT|O_TRUNC)) ? dir : NULL, 264 req); 265 if (err) 266 goto out_err; 267 268 err = ceph_handle_snapdir(req, dentry, err); 269 if (err == 0 && (flags & O_CREAT) && !req->r_reply_info.head->is_dentry) 270 err = ceph_handle_notrace_create(dir, dentry); 271 272 if (d_unhashed(dentry)) { 273 dn = ceph_finish_lookup(req, dentry, err); 274 if (IS_ERR(dn)) 275 err = PTR_ERR(dn); 276 } else { 277 /* we were given a hashed negative dentry */ 278 dn = NULL; 279 } 280 if (err) 281 goto out_err; 282 if (dn || dentry->d_inode == NULL || S_ISLNK(dentry->d_inode->i_mode)) { 283 /* make vfs retry on splice, ENOENT, or symlink */ 284 dout("atomic_open finish_no_open on dn %p\n", dn); 285 err = finish_no_open(file, dn); 286 } else { 287 dout("atomic_open finish_open on dn %p\n", dn); 288 if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) { 289 ceph_init_acl(dentry, dentry->d_inode, dir); 290 *opened |= FILE_CREATED; 291 } 292 err = finish_open(file, dentry, ceph_open, opened); 293 } 294 out_err: 295 if (!req->r_err && req->r_target_inode) 296 ceph_put_fmode(ceph_inode(req->r_target_inode), req->r_fmode); 297 ceph_mdsc_put_request(req); 298 dout("atomic_open result=%d\n", err); 299 return err; 300 } 301 302 int ceph_release(struct inode *inode, struct file *file) 303 { 304 struct ceph_inode_info *ci = ceph_inode(inode); 305 struct ceph_file_info *cf = file->private_data; 306 307 dout("release inode %p file %p\n", inode, file); 308 ceph_put_fmode(ci, cf->fmode); 309 if (cf->last_readdir) 310 ceph_mdsc_put_request(cf->last_readdir); 311 kfree(cf->last_name); 312 kfree(cf->dir_info); 313 dput(cf->dentry); 314 kmem_cache_free(ceph_file_cachep, cf); 315 316 /* wake up anyone waiting for caps on this inode */ 317 wake_up_all(&ci->i_cap_wq); 318 return 0; 319 } 320 321 /* 322 * Read a range of bytes striped over one or more objects. Iterate over 323 * objects we stripe over. (That's not atomic, but good enough for now.) 324 * 325 * If we get a short result from the OSD, check against i_size; we need to 326 * only return a short read to the caller if we hit EOF. 327 */ 328 static int striped_read(struct inode *inode, 329 u64 off, u64 len, 330 struct page **pages, int num_pages, 331 int *checkeof, bool o_direct, 332 unsigned long buf_align) 333 { 334 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 335 struct ceph_inode_info *ci = ceph_inode(inode); 336 u64 pos, this_len, left; 337 int io_align, page_align; 338 int pages_left; 339 int read; 340 struct page **page_pos; 341 int ret; 342 bool hit_stripe, was_short; 343 344 /* 345 * we may need to do multiple reads. not atomic, unfortunately. 346 */ 347 pos = off; 348 left = len; 349 page_pos = pages; 350 pages_left = num_pages; 351 read = 0; 352 io_align = off & ~PAGE_MASK; 353 354 more: 355 if (o_direct) 356 page_align = (pos - io_align + buf_align) & ~PAGE_MASK; 357 else 358 page_align = pos & ~PAGE_MASK; 359 this_len = left; 360 ret = ceph_osdc_readpages(&fsc->client->osdc, ceph_vino(inode), 361 &ci->i_layout, pos, &this_len, 362 ci->i_truncate_seq, 363 ci->i_truncate_size, 364 page_pos, pages_left, page_align); 365 if (ret == -ENOENT) 366 ret = 0; 367 hit_stripe = this_len < left; 368 was_short = ret >= 0 && ret < this_len; 369 dout("striped_read %llu~%llu (read %u) got %d%s%s\n", pos, left, read, 370 ret, hit_stripe ? " HITSTRIPE" : "", was_short ? " SHORT" : ""); 371 372 if (ret >= 0) { 373 int didpages; 374 if (was_short && (pos + ret < inode->i_size)) { 375 u64 tmp = min(this_len - ret, 376 inode->i_size - pos - ret); 377 dout(" zero gap %llu to %llu\n", 378 pos + ret, pos + ret + tmp); 379 ceph_zero_page_vector_range(page_align + read + ret, 380 tmp, pages); 381 ret += tmp; 382 } 383 384 didpages = (page_align + ret) >> PAGE_CACHE_SHIFT; 385 pos += ret; 386 read = pos - off; 387 left -= ret; 388 page_pos += didpages; 389 pages_left -= didpages; 390 391 /* hit stripe and need continue*/ 392 if (left && hit_stripe && pos < inode->i_size) 393 goto more; 394 } 395 396 if (read > 0) { 397 ret = read; 398 /* did we bounce off eof? */ 399 if (pos + left > inode->i_size) 400 *checkeof = 1; 401 } 402 403 dout("striped_read returns %d\n", ret); 404 return ret; 405 } 406 407 /* 408 * Completely synchronous read and write methods. Direct from __user 409 * buffer to osd, or directly to user pages (if O_DIRECT). 410 * 411 * If the read spans object boundary, just do multiple reads. 412 */ 413 static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *i, 414 int *checkeof) 415 { 416 struct file *file = iocb->ki_filp; 417 struct inode *inode = file_inode(file); 418 struct page **pages; 419 u64 off = iocb->ki_pos; 420 int num_pages, ret; 421 size_t len = iov_iter_count(i); 422 423 dout("sync_read on file %p %llu~%u %s\n", file, off, 424 (unsigned)len, 425 (file->f_flags & O_DIRECT) ? "O_DIRECT" : ""); 426 /* 427 * flush any page cache pages in this range. this 428 * will make concurrent normal and sync io slow, 429 * but it will at least behave sensibly when they are 430 * in sequence. 431 */ 432 ret = filemap_write_and_wait_range(inode->i_mapping, off, 433 off + len); 434 if (ret < 0) 435 return ret; 436 437 if (file->f_flags & O_DIRECT) { 438 while (iov_iter_count(i)) { 439 size_t start; 440 ssize_t n; 441 442 n = iov_iter_get_pages_alloc(i, &pages, INT_MAX, &start); 443 if (n < 0) 444 return n; 445 446 num_pages = (n + start + PAGE_SIZE - 1) / PAGE_SIZE; 447 448 ret = striped_read(inode, off, n, 449 pages, num_pages, checkeof, 450 1, start); 451 452 ceph_put_page_vector(pages, num_pages, true); 453 454 if (ret <= 0) 455 break; 456 off += ret; 457 iov_iter_advance(i, ret); 458 if (ret < n) 459 break; 460 } 461 } else { 462 num_pages = calc_pages_for(off, len); 463 pages = ceph_alloc_page_vector(num_pages, GFP_NOFS); 464 if (IS_ERR(pages)) 465 return PTR_ERR(pages); 466 ret = striped_read(inode, off, len, pages, 467 num_pages, checkeof, 0, 0); 468 if (ret > 0) { 469 int l, k = 0; 470 size_t left = ret; 471 472 while (left) { 473 int copy = min_t(size_t, PAGE_SIZE, left); 474 l = copy_page_to_iter(pages[k++], 0, copy, i); 475 off += l; 476 left -= l; 477 if (l < copy) 478 break; 479 } 480 } 481 ceph_release_page_vector(pages, num_pages); 482 } 483 484 if (off > iocb->ki_pos) { 485 ret = off - iocb->ki_pos; 486 iocb->ki_pos = off; 487 } 488 489 dout("sync_read result %d\n", ret); 490 return ret; 491 } 492 493 /* 494 * Write commit request unsafe callback, called to tell us when a 495 * request is unsafe (that is, in flight--has been handed to the 496 * messenger to send to its target osd). It is called again when 497 * we've received a response message indicating the request is 498 * "safe" (its CEPH_OSD_FLAG_ONDISK flag is set), or when a request 499 * is completed early (and unsuccessfully) due to a timeout or 500 * interrupt. 501 * 502 * This is used if we requested both an ACK and ONDISK commit reply 503 * from the OSD. 504 */ 505 static void ceph_sync_write_unsafe(struct ceph_osd_request *req, bool unsafe) 506 { 507 struct ceph_inode_info *ci = ceph_inode(req->r_inode); 508 509 dout("%s %p tid %llu %ssafe\n", __func__, req, req->r_tid, 510 unsafe ? "un" : ""); 511 if (unsafe) { 512 ceph_get_cap_refs(ci, CEPH_CAP_FILE_WR); 513 spin_lock(&ci->i_unsafe_lock); 514 list_add_tail(&req->r_unsafe_item, 515 &ci->i_unsafe_writes); 516 spin_unlock(&ci->i_unsafe_lock); 517 } else { 518 spin_lock(&ci->i_unsafe_lock); 519 list_del_init(&req->r_unsafe_item); 520 spin_unlock(&ci->i_unsafe_lock); 521 ceph_put_cap_refs(ci, CEPH_CAP_FILE_WR); 522 } 523 } 524 525 526 /* 527 * Synchronous write, straight from __user pointer or user pages. 528 * 529 * If write spans object boundary, just do multiple writes. (For a 530 * correct atomic write, we should e.g. take write locks on all 531 * objects, rollback on failure, etc.) 532 */ 533 static ssize_t 534 ceph_sync_direct_write(struct kiocb *iocb, struct iov_iter *from) 535 { 536 struct file *file = iocb->ki_filp; 537 struct inode *inode = file_inode(file); 538 struct ceph_inode_info *ci = ceph_inode(inode); 539 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 540 struct ceph_snap_context *snapc; 541 struct ceph_vino vino; 542 struct ceph_osd_request *req; 543 struct page **pages; 544 int num_pages; 545 int written = 0; 546 int flags; 547 int check_caps = 0; 548 int ret; 549 struct timespec mtime = CURRENT_TIME; 550 loff_t pos = iocb->ki_pos; 551 size_t count = iov_iter_count(from); 552 553 if (ceph_snap(file_inode(file)) != CEPH_NOSNAP) 554 return -EROFS; 555 556 dout("sync_direct_write on file %p %lld~%u\n", file, pos, 557 (unsigned)count); 558 559 ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count); 560 if (ret < 0) 561 return ret; 562 563 ret = invalidate_inode_pages2_range(inode->i_mapping, 564 pos >> PAGE_CACHE_SHIFT, 565 (pos + count) >> PAGE_CACHE_SHIFT); 566 if (ret < 0) 567 dout("invalidate_inode_pages2_range returned %d\n", ret); 568 569 flags = CEPH_OSD_FLAG_ORDERSNAP | 570 CEPH_OSD_FLAG_ONDISK | 571 CEPH_OSD_FLAG_WRITE; 572 573 while (iov_iter_count(from) > 0) { 574 u64 len = iov_iter_single_seg_count(from); 575 size_t start; 576 ssize_t n; 577 578 snapc = ci->i_snap_realm->cached_context; 579 vino = ceph_vino(inode); 580 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, 581 vino, pos, &len, 582 2,/*include a 'startsync' command*/ 583 CEPH_OSD_OP_WRITE, flags, snapc, 584 ci->i_truncate_seq, 585 ci->i_truncate_size, 586 false); 587 if (IS_ERR(req)) { 588 ret = PTR_ERR(req); 589 break; 590 } 591 592 n = iov_iter_get_pages_alloc(from, &pages, len, &start); 593 if (unlikely(n < 0)) { 594 ret = n; 595 ceph_osdc_put_request(req); 596 break; 597 } 598 599 num_pages = (n + start + PAGE_SIZE - 1) / PAGE_SIZE; 600 /* 601 * throw out any page cache pages in this range. this 602 * may block. 603 */ 604 truncate_inode_pages_range(inode->i_mapping, pos, 605 (pos+n) | (PAGE_CACHE_SIZE-1)); 606 osd_req_op_extent_osd_data_pages(req, 0, pages, n, start, 607 false, false); 608 609 /* BUG_ON(vino.snap != CEPH_NOSNAP); */ 610 ceph_osdc_build_request(req, pos, snapc, vino.snap, &mtime); 611 612 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false); 613 if (!ret) 614 ret = ceph_osdc_wait_request(&fsc->client->osdc, req); 615 616 ceph_put_page_vector(pages, num_pages, false); 617 618 ceph_osdc_put_request(req); 619 if (ret) 620 break; 621 pos += n; 622 written += n; 623 iov_iter_advance(from, n); 624 625 if (pos > i_size_read(inode)) { 626 check_caps = ceph_inode_set_size(inode, pos); 627 if (check_caps) 628 ceph_check_caps(ceph_inode(inode), 629 CHECK_CAPS_AUTHONLY, 630 NULL); 631 } 632 } 633 634 if (ret != -EOLDSNAPC && written > 0) { 635 iocb->ki_pos = pos; 636 ret = written; 637 } 638 return ret; 639 } 640 641 642 /* 643 * Synchronous write, straight from __user pointer or user pages. 644 * 645 * If write spans object boundary, just do multiple writes. (For a 646 * correct atomic write, we should e.g. take write locks on all 647 * objects, rollback on failure, etc.) 648 */ 649 static ssize_t ceph_sync_write(struct kiocb *iocb, struct iov_iter *from) 650 { 651 struct file *file = iocb->ki_filp; 652 struct inode *inode = file_inode(file); 653 struct ceph_inode_info *ci = ceph_inode(inode); 654 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 655 struct ceph_snap_context *snapc; 656 struct ceph_vino vino; 657 struct ceph_osd_request *req; 658 struct page **pages; 659 u64 len; 660 int num_pages; 661 int written = 0; 662 int flags; 663 int check_caps = 0; 664 int ret; 665 struct timespec mtime = CURRENT_TIME; 666 loff_t pos = iocb->ki_pos; 667 size_t count = iov_iter_count(from); 668 669 if (ceph_snap(file_inode(file)) != CEPH_NOSNAP) 670 return -EROFS; 671 672 dout("sync_write on file %p %lld~%u\n", file, pos, (unsigned)count); 673 674 ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count); 675 if (ret < 0) 676 return ret; 677 678 ret = invalidate_inode_pages2_range(inode->i_mapping, 679 pos >> PAGE_CACHE_SHIFT, 680 (pos + count) >> PAGE_CACHE_SHIFT); 681 if (ret < 0) 682 dout("invalidate_inode_pages2_range returned %d\n", ret); 683 684 flags = CEPH_OSD_FLAG_ORDERSNAP | 685 CEPH_OSD_FLAG_ONDISK | 686 CEPH_OSD_FLAG_WRITE | 687 CEPH_OSD_FLAG_ACK; 688 689 while ((len = iov_iter_count(from)) > 0) { 690 size_t left; 691 int n; 692 693 snapc = ci->i_snap_realm->cached_context; 694 vino = ceph_vino(inode); 695 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, 696 vino, pos, &len, 1, 697 CEPH_OSD_OP_WRITE, flags, snapc, 698 ci->i_truncate_seq, 699 ci->i_truncate_size, 700 false); 701 if (IS_ERR(req)) { 702 ret = PTR_ERR(req); 703 break; 704 } 705 706 /* 707 * write from beginning of first page, 708 * regardless of io alignment 709 */ 710 num_pages = (len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 711 712 pages = ceph_alloc_page_vector(num_pages, GFP_NOFS); 713 if (IS_ERR(pages)) { 714 ret = PTR_ERR(pages); 715 goto out; 716 } 717 718 left = len; 719 for (n = 0; n < num_pages; n++) { 720 size_t plen = min_t(size_t, left, PAGE_SIZE); 721 ret = copy_page_from_iter(pages[n], 0, plen, from); 722 if (ret != plen) { 723 ret = -EFAULT; 724 break; 725 } 726 left -= ret; 727 } 728 729 if (ret < 0) { 730 ceph_release_page_vector(pages, num_pages); 731 goto out; 732 } 733 734 /* get a second commit callback */ 735 req->r_unsafe_callback = ceph_sync_write_unsafe; 736 req->r_inode = inode; 737 738 osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, 739 false, true); 740 741 /* BUG_ON(vino.snap != CEPH_NOSNAP); */ 742 ceph_osdc_build_request(req, pos, snapc, vino.snap, &mtime); 743 744 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false); 745 if (!ret) 746 ret = ceph_osdc_wait_request(&fsc->client->osdc, req); 747 748 out: 749 ceph_osdc_put_request(req); 750 if (ret == 0) { 751 pos += len; 752 written += len; 753 754 if (pos > i_size_read(inode)) { 755 check_caps = ceph_inode_set_size(inode, pos); 756 if (check_caps) 757 ceph_check_caps(ceph_inode(inode), 758 CHECK_CAPS_AUTHONLY, 759 NULL); 760 } 761 } else 762 break; 763 } 764 765 if (ret != -EOLDSNAPC && written > 0) { 766 ret = written; 767 iocb->ki_pos = pos; 768 } 769 return ret; 770 } 771 772 /* 773 * Wrap generic_file_aio_read with checks for cap bits on the inode. 774 * Atomically grab references, so that those bits are not released 775 * back to the MDS mid-read. 776 * 777 * Hmm, the sync read case isn't actually async... should it be? 778 */ 779 static ssize_t ceph_read_iter(struct kiocb *iocb, struct iov_iter *to) 780 { 781 struct file *filp = iocb->ki_filp; 782 struct ceph_file_info *fi = filp->private_data; 783 size_t len = iocb->ki_nbytes; 784 struct inode *inode = file_inode(filp); 785 struct ceph_inode_info *ci = ceph_inode(inode); 786 ssize_t ret; 787 int want, got = 0; 788 int checkeof = 0, read = 0; 789 790 again: 791 dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n", 792 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, inode); 793 794 if (fi->fmode & CEPH_FILE_MODE_LAZY) 795 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO; 796 else 797 want = CEPH_CAP_FILE_CACHE; 798 ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, &got, -1); 799 if (ret < 0) 800 return ret; 801 802 if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 || 803 (iocb->ki_filp->f_flags & O_DIRECT) || 804 (fi->flags & CEPH_F_SYNC)) { 805 806 dout("aio_sync_read %p %llx.%llx %llu~%u got cap refs on %s\n", 807 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, 808 ceph_cap_string(got)); 809 810 /* hmm, this isn't really async... */ 811 ret = ceph_sync_read(iocb, to, &checkeof); 812 } else { 813 dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n", 814 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, 815 ceph_cap_string(got)); 816 817 ret = generic_file_read_iter(iocb, to); 818 } 819 dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n", 820 inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret); 821 ceph_put_cap_refs(ci, got); 822 823 if (checkeof && ret >= 0) { 824 int statret = ceph_do_getattr(inode, 825 CEPH_STAT_CAP_SIZE); 826 827 /* hit EOF or hole? */ 828 if (statret == 0 && iocb->ki_pos < inode->i_size && 829 ret < len) { 830 dout("sync_read hit hole, ppos %lld < size %lld" 831 ", reading more\n", iocb->ki_pos, 832 inode->i_size); 833 834 iov_iter_advance(to, ret); 835 read += ret; 836 len -= ret; 837 checkeof = 0; 838 goto again; 839 } 840 } 841 842 if (ret >= 0) 843 ret += read; 844 845 return ret; 846 } 847 848 /* 849 * Take cap references to avoid releasing caps to MDS mid-write. 850 * 851 * If we are synchronous, and write with an old snap context, the OSD 852 * may return EOLDSNAPC. In that case, retry the write.. _after_ 853 * dropping our cap refs and allowing the pending snap to logically 854 * complete _before_ this write occurs. 855 * 856 * If we are near ENOSPC, write synchronously. 857 */ 858 static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from) 859 { 860 struct file *file = iocb->ki_filp; 861 struct ceph_file_info *fi = file->private_data; 862 struct inode *inode = file_inode(file); 863 struct ceph_inode_info *ci = ceph_inode(inode); 864 struct ceph_osd_client *osdc = 865 &ceph_sb_to_client(inode->i_sb)->client->osdc; 866 ssize_t count = iov_iter_count(from), written = 0; 867 int err, want, got; 868 loff_t pos = iocb->ki_pos; 869 870 if (ceph_snap(inode) != CEPH_NOSNAP) 871 return -EROFS; 872 873 mutex_lock(&inode->i_mutex); 874 875 /* We can write back this queue in page reclaim */ 876 current->backing_dev_info = file->f_mapping->backing_dev_info; 877 878 err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode)); 879 if (err) 880 goto out; 881 882 if (count == 0) 883 goto out; 884 iov_iter_truncate(from, count); 885 886 err = file_remove_suid(file); 887 if (err) 888 goto out; 889 890 err = file_update_time(file); 891 if (err) 892 goto out; 893 894 retry_snap: 895 if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL)) { 896 err = -ENOSPC; 897 goto out; 898 } 899 900 dout("aio_write %p %llx.%llx %llu~%zd getting caps. i_size %llu\n", 901 inode, ceph_vinop(inode), pos, count, inode->i_size); 902 if (fi->fmode & CEPH_FILE_MODE_LAZY) 903 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; 904 else 905 want = CEPH_CAP_FILE_BUFFER; 906 got = 0; 907 err = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, &got, pos + count); 908 if (err < 0) 909 goto out; 910 911 dout("aio_write %p %llx.%llx %llu~%zd got cap refs on %s\n", 912 inode, ceph_vinop(inode), pos, count, ceph_cap_string(got)); 913 914 if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 || 915 (file->f_flags & O_DIRECT) || (fi->flags & CEPH_F_SYNC)) { 916 struct iov_iter data; 917 mutex_unlock(&inode->i_mutex); 918 /* we might need to revert back to that point */ 919 data = *from; 920 if (file->f_flags & O_DIRECT) 921 written = ceph_sync_direct_write(iocb, &data); 922 else 923 written = ceph_sync_write(iocb, &data); 924 if (written == -EOLDSNAPC) { 925 dout("aio_write %p %llx.%llx %llu~%u" 926 "got EOLDSNAPC, retrying\n", 927 inode, ceph_vinop(inode), 928 pos, (unsigned)count); 929 mutex_lock(&inode->i_mutex); 930 goto retry_snap; 931 } 932 if (written > 0) 933 iov_iter_advance(from, written); 934 } else { 935 loff_t old_size = inode->i_size; 936 /* 937 * No need to acquire the i_truncate_mutex. Because 938 * the MDS revokes Fwb caps before sending truncate 939 * message to us. We can't get Fwb cap while there 940 * are pending vmtruncate. So write and vmtruncate 941 * can not run at the same time 942 */ 943 written = generic_perform_write(file, from, pos); 944 if (likely(written >= 0)) 945 iocb->ki_pos = pos + written; 946 if (inode->i_size > old_size) 947 ceph_fscache_update_objectsize(inode); 948 mutex_unlock(&inode->i_mutex); 949 } 950 951 if (written >= 0) { 952 int dirty; 953 spin_lock(&ci->i_ceph_lock); 954 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR); 955 spin_unlock(&ci->i_ceph_lock); 956 if (dirty) 957 __mark_inode_dirty(inode, dirty); 958 } 959 960 dout("aio_write %p %llx.%llx %llu~%u dropping cap refs on %s\n", 961 inode, ceph_vinop(inode), pos, (unsigned)count, 962 ceph_cap_string(got)); 963 ceph_put_cap_refs(ci, got); 964 965 if (written >= 0 && 966 ((file->f_flags & O_SYNC) || IS_SYNC(file->f_mapping->host) || 967 ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_NEARFULL))) { 968 err = vfs_fsync_range(file, pos, pos + written - 1, 1); 969 if (err < 0) 970 written = err; 971 } 972 973 goto out_unlocked; 974 975 out: 976 mutex_unlock(&inode->i_mutex); 977 out_unlocked: 978 current->backing_dev_info = NULL; 979 return written ? written : err; 980 } 981 982 /* 983 * llseek. be sure to verify file size on SEEK_END. 984 */ 985 static loff_t ceph_llseek(struct file *file, loff_t offset, int whence) 986 { 987 struct inode *inode = file->f_mapping->host; 988 int ret; 989 990 mutex_lock(&inode->i_mutex); 991 992 if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) { 993 ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE); 994 if (ret < 0) { 995 offset = ret; 996 goto out; 997 } 998 } 999 1000 switch (whence) { 1001 case SEEK_END: 1002 offset += inode->i_size; 1003 break; 1004 case SEEK_CUR: 1005 /* 1006 * Here we special-case the lseek(fd, 0, SEEK_CUR) 1007 * position-querying operation. Avoid rewriting the "same" 1008 * f_pos value back to the file because a concurrent read(), 1009 * write() or lseek() might have altered it 1010 */ 1011 if (offset == 0) { 1012 offset = file->f_pos; 1013 goto out; 1014 } 1015 offset += file->f_pos; 1016 break; 1017 case SEEK_DATA: 1018 if (offset >= inode->i_size) { 1019 ret = -ENXIO; 1020 goto out; 1021 } 1022 break; 1023 case SEEK_HOLE: 1024 if (offset >= inode->i_size) { 1025 ret = -ENXIO; 1026 goto out; 1027 } 1028 offset = inode->i_size; 1029 break; 1030 } 1031 1032 offset = vfs_setpos(file, offset, inode->i_sb->s_maxbytes); 1033 1034 out: 1035 mutex_unlock(&inode->i_mutex); 1036 return offset; 1037 } 1038 1039 static inline void ceph_zero_partial_page( 1040 struct inode *inode, loff_t offset, unsigned size) 1041 { 1042 struct page *page; 1043 pgoff_t index = offset >> PAGE_CACHE_SHIFT; 1044 1045 page = find_lock_page(inode->i_mapping, index); 1046 if (page) { 1047 wait_on_page_writeback(page); 1048 zero_user(page, offset & (PAGE_CACHE_SIZE - 1), size); 1049 unlock_page(page); 1050 page_cache_release(page); 1051 } 1052 } 1053 1054 static void ceph_zero_pagecache_range(struct inode *inode, loff_t offset, 1055 loff_t length) 1056 { 1057 loff_t nearly = round_up(offset, PAGE_CACHE_SIZE); 1058 if (offset < nearly) { 1059 loff_t size = nearly - offset; 1060 if (length < size) 1061 size = length; 1062 ceph_zero_partial_page(inode, offset, size); 1063 offset += size; 1064 length -= size; 1065 } 1066 if (length >= PAGE_CACHE_SIZE) { 1067 loff_t size = round_down(length, PAGE_CACHE_SIZE); 1068 truncate_pagecache_range(inode, offset, offset + size - 1); 1069 offset += size; 1070 length -= size; 1071 } 1072 if (length) 1073 ceph_zero_partial_page(inode, offset, length); 1074 } 1075 1076 static int ceph_zero_partial_object(struct inode *inode, 1077 loff_t offset, loff_t *length) 1078 { 1079 struct ceph_inode_info *ci = ceph_inode(inode); 1080 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 1081 struct ceph_osd_request *req; 1082 int ret = 0; 1083 loff_t zero = 0; 1084 int op; 1085 1086 if (!length) { 1087 op = offset ? CEPH_OSD_OP_DELETE : CEPH_OSD_OP_TRUNCATE; 1088 length = &zero; 1089 } else { 1090 op = CEPH_OSD_OP_ZERO; 1091 } 1092 1093 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, 1094 ceph_vino(inode), 1095 offset, length, 1096 1, op, 1097 CEPH_OSD_FLAG_WRITE | 1098 CEPH_OSD_FLAG_ONDISK, 1099 NULL, 0, 0, false); 1100 if (IS_ERR(req)) { 1101 ret = PTR_ERR(req); 1102 goto out; 1103 } 1104 1105 ceph_osdc_build_request(req, offset, NULL, ceph_vino(inode).snap, 1106 &inode->i_mtime); 1107 1108 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false); 1109 if (!ret) { 1110 ret = ceph_osdc_wait_request(&fsc->client->osdc, req); 1111 if (ret == -ENOENT) 1112 ret = 0; 1113 } 1114 ceph_osdc_put_request(req); 1115 1116 out: 1117 return ret; 1118 } 1119 1120 static int ceph_zero_objects(struct inode *inode, loff_t offset, loff_t length) 1121 { 1122 int ret = 0; 1123 struct ceph_inode_info *ci = ceph_inode(inode); 1124 s32 stripe_unit = ceph_file_layout_su(ci->i_layout); 1125 s32 stripe_count = ceph_file_layout_stripe_count(ci->i_layout); 1126 s32 object_size = ceph_file_layout_object_size(ci->i_layout); 1127 u64 object_set_size = object_size * stripe_count; 1128 u64 nearly, t; 1129 1130 /* round offset up to next period boundary */ 1131 nearly = offset + object_set_size - 1; 1132 t = nearly; 1133 nearly -= do_div(t, object_set_size); 1134 1135 while (length && offset < nearly) { 1136 loff_t size = length; 1137 ret = ceph_zero_partial_object(inode, offset, &size); 1138 if (ret < 0) 1139 return ret; 1140 offset += size; 1141 length -= size; 1142 } 1143 while (length >= object_set_size) { 1144 int i; 1145 loff_t pos = offset; 1146 for (i = 0; i < stripe_count; ++i) { 1147 ret = ceph_zero_partial_object(inode, pos, NULL); 1148 if (ret < 0) 1149 return ret; 1150 pos += stripe_unit; 1151 } 1152 offset += object_set_size; 1153 length -= object_set_size; 1154 } 1155 while (length) { 1156 loff_t size = length; 1157 ret = ceph_zero_partial_object(inode, offset, &size); 1158 if (ret < 0) 1159 return ret; 1160 offset += size; 1161 length -= size; 1162 } 1163 return ret; 1164 } 1165 1166 static long ceph_fallocate(struct file *file, int mode, 1167 loff_t offset, loff_t length) 1168 { 1169 struct ceph_file_info *fi = file->private_data; 1170 struct inode *inode = file_inode(file); 1171 struct ceph_inode_info *ci = ceph_inode(inode); 1172 struct ceph_osd_client *osdc = 1173 &ceph_inode_to_client(inode)->client->osdc; 1174 int want, got = 0; 1175 int dirty; 1176 int ret = 0; 1177 loff_t endoff = 0; 1178 loff_t size; 1179 1180 if (!S_ISREG(inode->i_mode)) 1181 return -EOPNOTSUPP; 1182 1183 mutex_lock(&inode->i_mutex); 1184 1185 if (ceph_snap(inode) != CEPH_NOSNAP) { 1186 ret = -EROFS; 1187 goto unlock; 1188 } 1189 1190 if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL) && 1191 !(mode & FALLOC_FL_PUNCH_HOLE)) { 1192 ret = -ENOSPC; 1193 goto unlock; 1194 } 1195 1196 size = i_size_read(inode); 1197 if (!(mode & FALLOC_FL_KEEP_SIZE)) 1198 endoff = offset + length; 1199 1200 if (fi->fmode & CEPH_FILE_MODE_LAZY) 1201 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; 1202 else 1203 want = CEPH_CAP_FILE_BUFFER; 1204 1205 ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, &got, endoff); 1206 if (ret < 0) 1207 goto unlock; 1208 1209 if (mode & FALLOC_FL_PUNCH_HOLE) { 1210 if (offset < size) 1211 ceph_zero_pagecache_range(inode, offset, length); 1212 ret = ceph_zero_objects(inode, offset, length); 1213 } else if (endoff > size) { 1214 truncate_pagecache_range(inode, size, -1); 1215 if (ceph_inode_set_size(inode, endoff)) 1216 ceph_check_caps(ceph_inode(inode), 1217 CHECK_CAPS_AUTHONLY, NULL); 1218 } 1219 1220 if (!ret) { 1221 spin_lock(&ci->i_ceph_lock); 1222 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR); 1223 spin_unlock(&ci->i_ceph_lock); 1224 if (dirty) 1225 __mark_inode_dirty(inode, dirty); 1226 } 1227 1228 ceph_put_cap_refs(ci, got); 1229 unlock: 1230 mutex_unlock(&inode->i_mutex); 1231 return ret; 1232 } 1233 1234 const struct file_operations ceph_file_fops = { 1235 .open = ceph_open, 1236 .release = ceph_release, 1237 .llseek = ceph_llseek, 1238 .read = new_sync_read, 1239 .write = new_sync_write, 1240 .read_iter = ceph_read_iter, 1241 .write_iter = ceph_write_iter, 1242 .mmap = ceph_mmap, 1243 .fsync = ceph_fsync, 1244 .lock = ceph_lock, 1245 .flock = ceph_flock, 1246 .splice_read = generic_file_splice_read, 1247 .splice_write = iter_file_splice_write, 1248 .unlocked_ioctl = ceph_ioctl, 1249 .compat_ioctl = ceph_ioctl, 1250 .fallocate = ceph_fallocate, 1251 }; 1252 1253