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 struct ceph_acls_info acls = {}; 239 int err; 240 241 dout("atomic_open %p dentry %p '%.*s' %s flags %d mode 0%o\n", 242 dir, dentry, dentry->d_name.len, dentry->d_name.name, 243 d_unhashed(dentry) ? "unhashed" : "hashed", flags, mode); 244 245 if (dentry->d_name.len > NAME_MAX) 246 return -ENAMETOOLONG; 247 248 err = ceph_init_dentry(dentry); 249 if (err < 0) 250 return err; 251 252 if (flags & O_CREAT) { 253 err = ceph_pre_init_acls(dir, &mode, &acls); 254 if (err < 0) 255 return err; 256 } 257 258 /* do the open */ 259 req = prepare_open_request(dir->i_sb, flags, mode); 260 if (IS_ERR(req)) { 261 err = PTR_ERR(req); 262 goto out_acl; 263 } 264 req->r_dentry = dget(dentry); 265 req->r_num_caps = 2; 266 if (flags & O_CREAT) { 267 req->r_dentry_drop = CEPH_CAP_FILE_SHARED; 268 req->r_dentry_unless = CEPH_CAP_FILE_EXCL; 269 if (acls.pagelist) { 270 req->r_pagelist = acls.pagelist; 271 acls.pagelist = NULL; 272 } 273 } 274 req->r_locked_dir = dir; /* caller holds dir->i_mutex */ 275 err = ceph_mdsc_do_request(mdsc, 276 (flags & (O_CREAT|O_TRUNC)) ? dir : NULL, 277 req); 278 if (err) 279 goto out_req; 280 281 err = ceph_handle_snapdir(req, dentry, err); 282 if (err == 0 && (flags & O_CREAT) && !req->r_reply_info.head->is_dentry) 283 err = ceph_handle_notrace_create(dir, dentry); 284 285 if (d_unhashed(dentry)) { 286 dn = ceph_finish_lookup(req, dentry, err); 287 if (IS_ERR(dn)) 288 err = PTR_ERR(dn); 289 } else { 290 /* we were given a hashed negative dentry */ 291 dn = NULL; 292 } 293 if (err) 294 goto out_req; 295 if (dn || dentry->d_inode == NULL || S_ISLNK(dentry->d_inode->i_mode)) { 296 /* make vfs retry on splice, ENOENT, or symlink */ 297 dout("atomic_open finish_no_open on dn %p\n", dn); 298 err = finish_no_open(file, dn); 299 } else { 300 dout("atomic_open finish_open on dn %p\n", dn); 301 if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) { 302 ceph_init_inode_acls(dentry->d_inode, &acls); 303 *opened |= FILE_CREATED; 304 } 305 err = finish_open(file, dentry, ceph_open, opened); 306 } 307 out_req: 308 if (!req->r_err && req->r_target_inode) 309 ceph_put_fmode(ceph_inode(req->r_target_inode), req->r_fmode); 310 ceph_mdsc_put_request(req); 311 out_acl: 312 ceph_release_acls_info(&acls); 313 dout("atomic_open result=%d\n", err); 314 return err; 315 } 316 317 int ceph_release(struct inode *inode, struct file *file) 318 { 319 struct ceph_inode_info *ci = ceph_inode(inode); 320 struct ceph_file_info *cf = file->private_data; 321 322 dout("release inode %p file %p\n", inode, file); 323 ceph_put_fmode(ci, cf->fmode); 324 if (cf->last_readdir) 325 ceph_mdsc_put_request(cf->last_readdir); 326 kfree(cf->last_name); 327 kfree(cf->dir_info); 328 dput(cf->dentry); 329 kmem_cache_free(ceph_file_cachep, cf); 330 331 /* wake up anyone waiting for caps on this inode */ 332 wake_up_all(&ci->i_cap_wq); 333 return 0; 334 } 335 336 /* 337 * Read a range of bytes striped over one or more objects. Iterate over 338 * objects we stripe over. (That's not atomic, but good enough for now.) 339 * 340 * If we get a short result from the OSD, check against i_size; we need to 341 * only return a short read to the caller if we hit EOF. 342 */ 343 static int striped_read(struct inode *inode, 344 u64 off, u64 len, 345 struct page **pages, int num_pages, 346 int *checkeof, bool o_direct, 347 unsigned long buf_align) 348 { 349 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 350 struct ceph_inode_info *ci = ceph_inode(inode); 351 u64 pos, this_len, left; 352 int io_align, page_align; 353 int pages_left; 354 int read; 355 struct page **page_pos; 356 int ret; 357 bool hit_stripe, was_short; 358 359 /* 360 * we may need to do multiple reads. not atomic, unfortunately. 361 */ 362 pos = off; 363 left = len; 364 page_pos = pages; 365 pages_left = num_pages; 366 read = 0; 367 io_align = off & ~PAGE_MASK; 368 369 more: 370 if (o_direct) 371 page_align = (pos - io_align + buf_align) & ~PAGE_MASK; 372 else 373 page_align = pos & ~PAGE_MASK; 374 this_len = left; 375 ret = ceph_osdc_readpages(&fsc->client->osdc, ceph_vino(inode), 376 &ci->i_layout, pos, &this_len, 377 ci->i_truncate_seq, 378 ci->i_truncate_size, 379 page_pos, pages_left, page_align); 380 if (ret == -ENOENT) 381 ret = 0; 382 hit_stripe = this_len < left; 383 was_short = ret >= 0 && ret < this_len; 384 dout("striped_read %llu~%llu (read %u) got %d%s%s\n", pos, left, read, 385 ret, hit_stripe ? " HITSTRIPE" : "", was_short ? " SHORT" : ""); 386 387 if (ret >= 0) { 388 int didpages; 389 if (was_short && (pos + ret < inode->i_size)) { 390 u64 tmp = min(this_len - ret, 391 inode->i_size - pos - ret); 392 dout(" zero gap %llu to %llu\n", 393 pos + ret, pos + ret + tmp); 394 ceph_zero_page_vector_range(page_align + read + ret, 395 tmp, pages); 396 ret += tmp; 397 } 398 399 didpages = (page_align + ret) >> PAGE_CACHE_SHIFT; 400 pos += ret; 401 read = pos - off; 402 left -= ret; 403 page_pos += didpages; 404 pages_left -= didpages; 405 406 /* hit stripe and need continue*/ 407 if (left && hit_stripe && pos < inode->i_size) 408 goto more; 409 } 410 411 if (read > 0) { 412 ret = read; 413 /* did we bounce off eof? */ 414 if (pos + left > inode->i_size) 415 *checkeof = 1; 416 } 417 418 dout("striped_read returns %d\n", ret); 419 return ret; 420 } 421 422 /* 423 * Completely synchronous read and write methods. Direct from __user 424 * buffer to osd, or directly to user pages (if O_DIRECT). 425 * 426 * If the read spans object boundary, just do multiple reads. 427 */ 428 static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *i, 429 int *checkeof) 430 { 431 struct file *file = iocb->ki_filp; 432 struct inode *inode = file_inode(file); 433 struct page **pages; 434 u64 off = iocb->ki_pos; 435 int num_pages, ret; 436 size_t len = iov_iter_count(i); 437 438 dout("sync_read on file %p %llu~%u %s\n", file, off, 439 (unsigned)len, 440 (file->f_flags & O_DIRECT) ? "O_DIRECT" : ""); 441 442 if (!len) 443 return 0; 444 /* 445 * flush any page cache pages in this range. this 446 * will make concurrent normal and sync io slow, 447 * but it will at least behave sensibly when they are 448 * in sequence. 449 */ 450 ret = filemap_write_and_wait_range(inode->i_mapping, off, 451 off + len); 452 if (ret < 0) 453 return ret; 454 455 if (file->f_flags & O_DIRECT) { 456 while (iov_iter_count(i)) { 457 size_t start; 458 ssize_t n; 459 460 n = iov_iter_get_pages_alloc(i, &pages, INT_MAX, &start); 461 if (n < 0) 462 return n; 463 464 num_pages = (n + start + PAGE_SIZE - 1) / PAGE_SIZE; 465 466 ret = striped_read(inode, off, n, 467 pages, num_pages, checkeof, 468 1, start); 469 470 ceph_put_page_vector(pages, num_pages, true); 471 472 if (ret <= 0) 473 break; 474 off += ret; 475 iov_iter_advance(i, ret); 476 if (ret < n) 477 break; 478 } 479 } else { 480 num_pages = calc_pages_for(off, len); 481 pages = ceph_alloc_page_vector(num_pages, GFP_NOFS); 482 if (IS_ERR(pages)) 483 return PTR_ERR(pages); 484 ret = striped_read(inode, off, len, pages, 485 num_pages, checkeof, 0, 0); 486 if (ret > 0) { 487 int l, k = 0; 488 size_t left = ret; 489 490 while (left) { 491 size_t page_off = off & ~PAGE_MASK; 492 size_t copy = min_t(size_t, 493 PAGE_SIZE - page_off, left); 494 l = copy_page_to_iter(pages[k++], page_off, 495 copy, i); 496 off += l; 497 left -= l; 498 if (l < copy) 499 break; 500 } 501 } 502 ceph_release_page_vector(pages, num_pages); 503 } 504 505 if (off > iocb->ki_pos) { 506 ret = off - iocb->ki_pos; 507 iocb->ki_pos = off; 508 } 509 510 dout("sync_read result %d\n", ret); 511 return ret; 512 } 513 514 /* 515 * Write commit request unsafe callback, called to tell us when a 516 * request is unsafe (that is, in flight--has been handed to the 517 * messenger to send to its target osd). It is called again when 518 * we've received a response message indicating the request is 519 * "safe" (its CEPH_OSD_FLAG_ONDISK flag is set), or when a request 520 * is completed early (and unsuccessfully) due to a timeout or 521 * interrupt. 522 * 523 * This is used if we requested both an ACK and ONDISK commit reply 524 * from the OSD. 525 */ 526 static void ceph_sync_write_unsafe(struct ceph_osd_request *req, bool unsafe) 527 { 528 struct ceph_inode_info *ci = ceph_inode(req->r_inode); 529 530 dout("%s %p tid %llu %ssafe\n", __func__, req, req->r_tid, 531 unsafe ? "un" : ""); 532 if (unsafe) { 533 ceph_get_cap_refs(ci, CEPH_CAP_FILE_WR); 534 spin_lock(&ci->i_unsafe_lock); 535 list_add_tail(&req->r_unsafe_item, 536 &ci->i_unsafe_writes); 537 spin_unlock(&ci->i_unsafe_lock); 538 } else { 539 spin_lock(&ci->i_unsafe_lock); 540 list_del_init(&req->r_unsafe_item); 541 spin_unlock(&ci->i_unsafe_lock); 542 ceph_put_cap_refs(ci, CEPH_CAP_FILE_WR); 543 } 544 } 545 546 547 /* 548 * Synchronous write, straight from __user pointer or user pages. 549 * 550 * If write spans object boundary, just do multiple writes. (For a 551 * correct atomic write, we should e.g. take write locks on all 552 * objects, rollback on failure, etc.) 553 */ 554 static ssize_t 555 ceph_sync_direct_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos) 556 { 557 struct file *file = iocb->ki_filp; 558 struct inode *inode = file_inode(file); 559 struct ceph_inode_info *ci = ceph_inode(inode); 560 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 561 struct ceph_snap_context *snapc; 562 struct ceph_vino vino; 563 struct ceph_osd_request *req; 564 struct page **pages; 565 int num_pages; 566 int written = 0; 567 int flags; 568 int check_caps = 0; 569 int ret; 570 struct timespec mtime = CURRENT_TIME; 571 size_t count = iov_iter_count(from); 572 573 if (ceph_snap(file_inode(file)) != CEPH_NOSNAP) 574 return -EROFS; 575 576 dout("sync_direct_write on file %p %lld~%u\n", file, pos, 577 (unsigned)count); 578 579 ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count); 580 if (ret < 0) 581 return ret; 582 583 ret = invalidate_inode_pages2_range(inode->i_mapping, 584 pos >> PAGE_CACHE_SHIFT, 585 (pos + count) >> PAGE_CACHE_SHIFT); 586 if (ret < 0) 587 dout("invalidate_inode_pages2_range returned %d\n", ret); 588 589 flags = CEPH_OSD_FLAG_ORDERSNAP | 590 CEPH_OSD_FLAG_ONDISK | 591 CEPH_OSD_FLAG_WRITE; 592 593 while (iov_iter_count(from) > 0) { 594 u64 len = iov_iter_single_seg_count(from); 595 size_t start; 596 ssize_t n; 597 598 snapc = ci->i_snap_realm->cached_context; 599 vino = ceph_vino(inode); 600 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, 601 vino, pos, &len, 602 2,/*include a 'startsync' command*/ 603 CEPH_OSD_OP_WRITE, flags, snapc, 604 ci->i_truncate_seq, 605 ci->i_truncate_size, 606 false); 607 if (IS_ERR(req)) { 608 ret = PTR_ERR(req); 609 break; 610 } 611 612 n = iov_iter_get_pages_alloc(from, &pages, len, &start); 613 if (unlikely(n < 0)) { 614 ret = n; 615 ceph_osdc_put_request(req); 616 break; 617 } 618 619 num_pages = (n + start + PAGE_SIZE - 1) / PAGE_SIZE; 620 /* 621 * throw out any page cache pages in this range. this 622 * may block. 623 */ 624 truncate_inode_pages_range(inode->i_mapping, pos, 625 (pos+n) | (PAGE_CACHE_SIZE-1)); 626 osd_req_op_extent_osd_data_pages(req, 0, pages, n, start, 627 false, false); 628 629 /* BUG_ON(vino.snap != CEPH_NOSNAP); */ 630 ceph_osdc_build_request(req, pos, snapc, vino.snap, &mtime); 631 632 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false); 633 if (!ret) 634 ret = ceph_osdc_wait_request(&fsc->client->osdc, req); 635 636 ceph_put_page_vector(pages, num_pages, false); 637 638 ceph_osdc_put_request(req); 639 if (ret) 640 break; 641 pos += n; 642 written += n; 643 iov_iter_advance(from, n); 644 645 if (pos > i_size_read(inode)) { 646 check_caps = ceph_inode_set_size(inode, pos); 647 if (check_caps) 648 ceph_check_caps(ceph_inode(inode), 649 CHECK_CAPS_AUTHONLY, 650 NULL); 651 } 652 } 653 654 if (ret != -EOLDSNAPC && written > 0) { 655 iocb->ki_pos = pos; 656 ret = written; 657 } 658 return ret; 659 } 660 661 662 /* 663 * Synchronous write, straight from __user pointer or user pages. 664 * 665 * If write spans object boundary, just do multiple writes. (For a 666 * correct atomic write, we should e.g. take write locks on all 667 * objects, rollback on failure, etc.) 668 */ 669 static ssize_t 670 ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos) 671 { 672 struct file *file = iocb->ki_filp; 673 struct inode *inode = file_inode(file); 674 struct ceph_inode_info *ci = ceph_inode(inode); 675 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 676 struct ceph_snap_context *snapc; 677 struct ceph_vino vino; 678 struct ceph_osd_request *req; 679 struct page **pages; 680 u64 len; 681 int num_pages; 682 int written = 0; 683 int flags; 684 int check_caps = 0; 685 int ret; 686 struct timespec mtime = CURRENT_TIME; 687 size_t count = iov_iter_count(from); 688 689 if (ceph_snap(file_inode(file)) != CEPH_NOSNAP) 690 return -EROFS; 691 692 dout("sync_write on file %p %lld~%u\n", file, pos, (unsigned)count); 693 694 ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count); 695 if (ret < 0) 696 return ret; 697 698 ret = invalidate_inode_pages2_range(inode->i_mapping, 699 pos >> PAGE_CACHE_SHIFT, 700 (pos + count) >> PAGE_CACHE_SHIFT); 701 if (ret < 0) 702 dout("invalidate_inode_pages2_range returned %d\n", ret); 703 704 flags = CEPH_OSD_FLAG_ORDERSNAP | 705 CEPH_OSD_FLAG_ONDISK | 706 CEPH_OSD_FLAG_WRITE | 707 CEPH_OSD_FLAG_ACK; 708 709 while ((len = iov_iter_count(from)) > 0) { 710 size_t left; 711 int n; 712 713 snapc = ci->i_snap_realm->cached_context; 714 vino = ceph_vino(inode); 715 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, 716 vino, pos, &len, 1, 717 CEPH_OSD_OP_WRITE, flags, snapc, 718 ci->i_truncate_seq, 719 ci->i_truncate_size, 720 false); 721 if (IS_ERR(req)) { 722 ret = PTR_ERR(req); 723 break; 724 } 725 726 /* 727 * write from beginning of first page, 728 * regardless of io alignment 729 */ 730 num_pages = (len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 731 732 pages = ceph_alloc_page_vector(num_pages, GFP_NOFS); 733 if (IS_ERR(pages)) { 734 ret = PTR_ERR(pages); 735 goto out; 736 } 737 738 left = len; 739 for (n = 0; n < num_pages; n++) { 740 size_t plen = min_t(size_t, left, PAGE_SIZE); 741 ret = copy_page_from_iter(pages[n], 0, plen, from); 742 if (ret != plen) { 743 ret = -EFAULT; 744 break; 745 } 746 left -= ret; 747 } 748 749 if (ret < 0) { 750 ceph_release_page_vector(pages, num_pages); 751 goto out; 752 } 753 754 /* get a second commit callback */ 755 req->r_unsafe_callback = ceph_sync_write_unsafe; 756 req->r_inode = inode; 757 758 osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, 759 false, true); 760 761 /* BUG_ON(vino.snap != CEPH_NOSNAP); */ 762 ceph_osdc_build_request(req, pos, snapc, vino.snap, &mtime); 763 764 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false); 765 if (!ret) 766 ret = ceph_osdc_wait_request(&fsc->client->osdc, req); 767 768 out: 769 ceph_osdc_put_request(req); 770 if (ret == 0) { 771 pos += len; 772 written += len; 773 774 if (pos > i_size_read(inode)) { 775 check_caps = ceph_inode_set_size(inode, pos); 776 if (check_caps) 777 ceph_check_caps(ceph_inode(inode), 778 CHECK_CAPS_AUTHONLY, 779 NULL); 780 } 781 } else 782 break; 783 } 784 785 if (ret != -EOLDSNAPC && written > 0) { 786 ret = written; 787 iocb->ki_pos = pos; 788 } 789 return ret; 790 } 791 792 /* 793 * Wrap generic_file_aio_read with checks for cap bits on the inode. 794 * Atomically grab references, so that those bits are not released 795 * back to the MDS mid-read. 796 * 797 * Hmm, the sync read case isn't actually async... should it be? 798 */ 799 static ssize_t ceph_read_iter(struct kiocb *iocb, struct iov_iter *to) 800 { 801 struct file *filp = iocb->ki_filp; 802 struct ceph_file_info *fi = filp->private_data; 803 size_t len = iocb->ki_nbytes; 804 struct inode *inode = file_inode(filp); 805 struct ceph_inode_info *ci = ceph_inode(inode); 806 ssize_t ret; 807 int want, got = 0; 808 int checkeof = 0, read = 0; 809 810 again: 811 dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n", 812 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, inode); 813 814 if (fi->fmode & CEPH_FILE_MODE_LAZY) 815 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO; 816 else 817 want = CEPH_CAP_FILE_CACHE; 818 ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, &got, -1); 819 if (ret < 0) 820 return ret; 821 822 if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 || 823 (iocb->ki_filp->f_flags & O_DIRECT) || 824 (fi->flags & CEPH_F_SYNC)) { 825 826 dout("aio_sync_read %p %llx.%llx %llu~%u got cap refs on %s\n", 827 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, 828 ceph_cap_string(got)); 829 830 /* hmm, this isn't really async... */ 831 ret = ceph_sync_read(iocb, to, &checkeof); 832 } else { 833 dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n", 834 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, 835 ceph_cap_string(got)); 836 837 ret = generic_file_read_iter(iocb, to); 838 } 839 dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n", 840 inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret); 841 ceph_put_cap_refs(ci, got); 842 843 if (checkeof && ret >= 0) { 844 int statret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false); 845 846 /* hit EOF or hole? */ 847 if (statret == 0 && iocb->ki_pos < inode->i_size && 848 ret < len) { 849 dout("sync_read hit hole, ppos %lld < size %lld" 850 ", reading more\n", iocb->ki_pos, 851 inode->i_size); 852 853 read += ret; 854 len -= ret; 855 checkeof = 0; 856 goto again; 857 } 858 } 859 860 if (ret >= 0) 861 ret += read; 862 863 return ret; 864 } 865 866 /* 867 * Take cap references to avoid releasing caps to MDS mid-write. 868 * 869 * If we are synchronous, and write with an old snap context, the OSD 870 * may return EOLDSNAPC. In that case, retry the write.. _after_ 871 * dropping our cap refs and allowing the pending snap to logically 872 * complete _before_ this write occurs. 873 * 874 * If we are near ENOSPC, write synchronously. 875 */ 876 static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from) 877 { 878 struct file *file = iocb->ki_filp; 879 struct ceph_file_info *fi = file->private_data; 880 struct inode *inode = file_inode(file); 881 struct ceph_inode_info *ci = ceph_inode(inode); 882 struct ceph_osd_client *osdc = 883 &ceph_sb_to_client(inode->i_sb)->client->osdc; 884 ssize_t count = iov_iter_count(from), written = 0; 885 int err, want, got; 886 loff_t pos = iocb->ki_pos; 887 888 if (ceph_snap(inode) != CEPH_NOSNAP) 889 return -EROFS; 890 891 mutex_lock(&inode->i_mutex); 892 893 /* We can write back this queue in page reclaim */ 894 current->backing_dev_info = file->f_mapping->backing_dev_info; 895 896 err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode)); 897 if (err) 898 goto out; 899 900 if (count == 0) 901 goto out; 902 iov_iter_truncate(from, count); 903 904 err = file_remove_suid(file); 905 if (err) 906 goto out; 907 908 err = file_update_time(file); 909 if (err) 910 goto out; 911 912 retry_snap: 913 if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL)) { 914 err = -ENOSPC; 915 goto out; 916 } 917 918 dout("aio_write %p %llx.%llx %llu~%zd getting caps. i_size %llu\n", 919 inode, ceph_vinop(inode), pos, count, inode->i_size); 920 if (fi->fmode & CEPH_FILE_MODE_LAZY) 921 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; 922 else 923 want = CEPH_CAP_FILE_BUFFER; 924 got = 0; 925 err = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, &got, pos + count); 926 if (err < 0) 927 goto out; 928 929 dout("aio_write %p %llx.%llx %llu~%zd got cap refs on %s\n", 930 inode, ceph_vinop(inode), pos, count, ceph_cap_string(got)); 931 932 if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 || 933 (file->f_flags & O_DIRECT) || (fi->flags & CEPH_F_SYNC)) { 934 struct iov_iter data; 935 mutex_unlock(&inode->i_mutex); 936 /* we might need to revert back to that point */ 937 data = *from; 938 if (file->f_flags & O_DIRECT) 939 written = ceph_sync_direct_write(iocb, &data, pos); 940 else 941 written = ceph_sync_write(iocb, &data, pos); 942 if (written == -EOLDSNAPC) { 943 dout("aio_write %p %llx.%llx %llu~%u" 944 "got EOLDSNAPC, retrying\n", 945 inode, ceph_vinop(inode), 946 pos, (unsigned)count); 947 mutex_lock(&inode->i_mutex); 948 goto retry_snap; 949 } 950 if (written > 0) 951 iov_iter_advance(from, written); 952 } else { 953 loff_t old_size = inode->i_size; 954 /* 955 * No need to acquire the i_truncate_mutex. Because 956 * the MDS revokes Fwb caps before sending truncate 957 * message to us. We can't get Fwb cap while there 958 * are pending vmtruncate. So write and vmtruncate 959 * can not run at the same time 960 */ 961 written = generic_perform_write(file, from, pos); 962 if (likely(written >= 0)) 963 iocb->ki_pos = pos + written; 964 if (inode->i_size > old_size) 965 ceph_fscache_update_objectsize(inode); 966 mutex_unlock(&inode->i_mutex); 967 } 968 969 if (written >= 0) { 970 int dirty; 971 spin_lock(&ci->i_ceph_lock); 972 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR); 973 spin_unlock(&ci->i_ceph_lock); 974 if (dirty) 975 __mark_inode_dirty(inode, dirty); 976 } 977 978 dout("aio_write %p %llx.%llx %llu~%u dropping cap refs on %s\n", 979 inode, ceph_vinop(inode), pos, (unsigned)count, 980 ceph_cap_string(got)); 981 ceph_put_cap_refs(ci, got); 982 983 if (written >= 0 && 984 ((file->f_flags & O_SYNC) || IS_SYNC(file->f_mapping->host) || 985 ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_NEARFULL))) { 986 err = vfs_fsync_range(file, pos, pos + written - 1, 1); 987 if (err < 0) 988 written = err; 989 } 990 991 goto out_unlocked; 992 993 out: 994 mutex_unlock(&inode->i_mutex); 995 out_unlocked: 996 current->backing_dev_info = NULL; 997 return written ? written : err; 998 } 999 1000 /* 1001 * llseek. be sure to verify file size on SEEK_END. 1002 */ 1003 static loff_t ceph_llseek(struct file *file, loff_t offset, int whence) 1004 { 1005 struct inode *inode = file->f_mapping->host; 1006 int ret; 1007 1008 mutex_lock(&inode->i_mutex); 1009 1010 if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) { 1011 ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false); 1012 if (ret < 0) { 1013 offset = ret; 1014 goto out; 1015 } 1016 } 1017 1018 switch (whence) { 1019 case SEEK_END: 1020 offset += inode->i_size; 1021 break; 1022 case SEEK_CUR: 1023 /* 1024 * Here we special-case the lseek(fd, 0, SEEK_CUR) 1025 * position-querying operation. Avoid rewriting the "same" 1026 * f_pos value back to the file because a concurrent read(), 1027 * write() or lseek() might have altered it 1028 */ 1029 if (offset == 0) { 1030 offset = file->f_pos; 1031 goto out; 1032 } 1033 offset += file->f_pos; 1034 break; 1035 case SEEK_DATA: 1036 if (offset >= inode->i_size) { 1037 ret = -ENXIO; 1038 goto out; 1039 } 1040 break; 1041 case SEEK_HOLE: 1042 if (offset >= inode->i_size) { 1043 ret = -ENXIO; 1044 goto out; 1045 } 1046 offset = inode->i_size; 1047 break; 1048 } 1049 1050 offset = vfs_setpos(file, offset, inode->i_sb->s_maxbytes); 1051 1052 out: 1053 mutex_unlock(&inode->i_mutex); 1054 return offset; 1055 } 1056 1057 static inline void ceph_zero_partial_page( 1058 struct inode *inode, loff_t offset, unsigned size) 1059 { 1060 struct page *page; 1061 pgoff_t index = offset >> PAGE_CACHE_SHIFT; 1062 1063 page = find_lock_page(inode->i_mapping, index); 1064 if (page) { 1065 wait_on_page_writeback(page); 1066 zero_user(page, offset & (PAGE_CACHE_SIZE - 1), size); 1067 unlock_page(page); 1068 page_cache_release(page); 1069 } 1070 } 1071 1072 static void ceph_zero_pagecache_range(struct inode *inode, loff_t offset, 1073 loff_t length) 1074 { 1075 loff_t nearly = round_up(offset, PAGE_CACHE_SIZE); 1076 if (offset < nearly) { 1077 loff_t size = nearly - offset; 1078 if (length < size) 1079 size = length; 1080 ceph_zero_partial_page(inode, offset, size); 1081 offset += size; 1082 length -= size; 1083 } 1084 if (length >= PAGE_CACHE_SIZE) { 1085 loff_t size = round_down(length, PAGE_CACHE_SIZE); 1086 truncate_pagecache_range(inode, offset, offset + size - 1); 1087 offset += size; 1088 length -= size; 1089 } 1090 if (length) 1091 ceph_zero_partial_page(inode, offset, length); 1092 } 1093 1094 static int ceph_zero_partial_object(struct inode *inode, 1095 loff_t offset, loff_t *length) 1096 { 1097 struct ceph_inode_info *ci = ceph_inode(inode); 1098 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 1099 struct ceph_osd_request *req; 1100 int ret = 0; 1101 loff_t zero = 0; 1102 int op; 1103 1104 if (!length) { 1105 op = offset ? CEPH_OSD_OP_DELETE : CEPH_OSD_OP_TRUNCATE; 1106 length = &zero; 1107 } else { 1108 op = CEPH_OSD_OP_ZERO; 1109 } 1110 1111 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, 1112 ceph_vino(inode), 1113 offset, length, 1114 1, op, 1115 CEPH_OSD_FLAG_WRITE | 1116 CEPH_OSD_FLAG_ONDISK, 1117 NULL, 0, 0, false); 1118 if (IS_ERR(req)) { 1119 ret = PTR_ERR(req); 1120 goto out; 1121 } 1122 1123 ceph_osdc_build_request(req, offset, NULL, ceph_vino(inode).snap, 1124 &inode->i_mtime); 1125 1126 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false); 1127 if (!ret) { 1128 ret = ceph_osdc_wait_request(&fsc->client->osdc, req); 1129 if (ret == -ENOENT) 1130 ret = 0; 1131 } 1132 ceph_osdc_put_request(req); 1133 1134 out: 1135 return ret; 1136 } 1137 1138 static int ceph_zero_objects(struct inode *inode, loff_t offset, loff_t length) 1139 { 1140 int ret = 0; 1141 struct ceph_inode_info *ci = ceph_inode(inode); 1142 s32 stripe_unit = ceph_file_layout_su(ci->i_layout); 1143 s32 stripe_count = ceph_file_layout_stripe_count(ci->i_layout); 1144 s32 object_size = ceph_file_layout_object_size(ci->i_layout); 1145 u64 object_set_size = object_size * stripe_count; 1146 u64 nearly, t; 1147 1148 /* round offset up to next period boundary */ 1149 nearly = offset + object_set_size - 1; 1150 t = nearly; 1151 nearly -= do_div(t, object_set_size); 1152 1153 while (length && offset < nearly) { 1154 loff_t size = length; 1155 ret = ceph_zero_partial_object(inode, offset, &size); 1156 if (ret < 0) 1157 return ret; 1158 offset += size; 1159 length -= size; 1160 } 1161 while (length >= object_set_size) { 1162 int i; 1163 loff_t pos = offset; 1164 for (i = 0; i < stripe_count; ++i) { 1165 ret = ceph_zero_partial_object(inode, pos, NULL); 1166 if (ret < 0) 1167 return ret; 1168 pos += stripe_unit; 1169 } 1170 offset += object_set_size; 1171 length -= object_set_size; 1172 } 1173 while (length) { 1174 loff_t size = length; 1175 ret = ceph_zero_partial_object(inode, offset, &size); 1176 if (ret < 0) 1177 return ret; 1178 offset += size; 1179 length -= size; 1180 } 1181 return ret; 1182 } 1183 1184 static long ceph_fallocate(struct file *file, int mode, 1185 loff_t offset, loff_t length) 1186 { 1187 struct ceph_file_info *fi = file->private_data; 1188 struct inode *inode = file_inode(file); 1189 struct ceph_inode_info *ci = ceph_inode(inode); 1190 struct ceph_osd_client *osdc = 1191 &ceph_inode_to_client(inode)->client->osdc; 1192 int want, got = 0; 1193 int dirty; 1194 int ret = 0; 1195 loff_t endoff = 0; 1196 loff_t size; 1197 1198 if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE)) 1199 return -EOPNOTSUPP; 1200 1201 if (!S_ISREG(inode->i_mode)) 1202 return -EOPNOTSUPP; 1203 1204 mutex_lock(&inode->i_mutex); 1205 1206 if (ceph_snap(inode) != CEPH_NOSNAP) { 1207 ret = -EROFS; 1208 goto unlock; 1209 } 1210 1211 if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL) && 1212 !(mode & FALLOC_FL_PUNCH_HOLE)) { 1213 ret = -ENOSPC; 1214 goto unlock; 1215 } 1216 1217 size = i_size_read(inode); 1218 if (!(mode & FALLOC_FL_KEEP_SIZE)) 1219 endoff = offset + length; 1220 1221 if (fi->fmode & CEPH_FILE_MODE_LAZY) 1222 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; 1223 else 1224 want = CEPH_CAP_FILE_BUFFER; 1225 1226 ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, &got, endoff); 1227 if (ret < 0) 1228 goto unlock; 1229 1230 if (mode & FALLOC_FL_PUNCH_HOLE) { 1231 if (offset < size) 1232 ceph_zero_pagecache_range(inode, offset, length); 1233 ret = ceph_zero_objects(inode, offset, length); 1234 } else if (endoff > size) { 1235 truncate_pagecache_range(inode, size, -1); 1236 if (ceph_inode_set_size(inode, endoff)) 1237 ceph_check_caps(ceph_inode(inode), 1238 CHECK_CAPS_AUTHONLY, NULL); 1239 } 1240 1241 if (!ret) { 1242 spin_lock(&ci->i_ceph_lock); 1243 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR); 1244 spin_unlock(&ci->i_ceph_lock); 1245 if (dirty) 1246 __mark_inode_dirty(inode, dirty); 1247 } 1248 1249 ceph_put_cap_refs(ci, got); 1250 unlock: 1251 mutex_unlock(&inode->i_mutex); 1252 return ret; 1253 } 1254 1255 const struct file_operations ceph_file_fops = { 1256 .open = ceph_open, 1257 .release = ceph_release, 1258 .llseek = ceph_llseek, 1259 .read = new_sync_read, 1260 .write = new_sync_write, 1261 .read_iter = ceph_read_iter, 1262 .write_iter = ceph_write_iter, 1263 .mmap = ceph_mmap, 1264 .fsync = ceph_fsync, 1265 .lock = ceph_lock, 1266 .flock = ceph_flock, 1267 .splice_read = generic_file_splice_read, 1268 .splice_write = iter_file_splice_write, 1269 .unlocked_ioctl = ceph_ioctl, 1270 .compat_ioctl = ceph_ioctl, 1271 .fallocate = ceph_fallocate, 1272 }; 1273 1274