1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/ceph/ceph_debug.h> 3 #include <linux/ceph/striper.h> 4 5 #include <linux/module.h> 6 #include <linux/sched.h> 7 #include <linux/slab.h> 8 #include <linux/file.h> 9 #include <linux/mount.h> 10 #include <linux/namei.h> 11 #include <linux/writeback.h> 12 #include <linux/falloc.h> 13 #include <linux/iversion.h> 14 15 #include "super.h" 16 #include "mds_client.h" 17 #include "cache.h" 18 #include "io.h" 19 20 static __le32 ceph_flags_sys2wire(u32 flags) 21 { 22 u32 wire_flags = 0; 23 24 switch (flags & O_ACCMODE) { 25 case O_RDONLY: 26 wire_flags |= CEPH_O_RDONLY; 27 break; 28 case O_WRONLY: 29 wire_flags |= CEPH_O_WRONLY; 30 break; 31 case O_RDWR: 32 wire_flags |= CEPH_O_RDWR; 33 break; 34 } 35 36 flags &= ~O_ACCMODE; 37 38 #define ceph_sys2wire(a) if (flags & a) { wire_flags |= CEPH_##a; flags &= ~a; } 39 40 ceph_sys2wire(O_CREAT); 41 ceph_sys2wire(O_EXCL); 42 ceph_sys2wire(O_TRUNC); 43 ceph_sys2wire(O_DIRECTORY); 44 ceph_sys2wire(O_NOFOLLOW); 45 46 #undef ceph_sys2wire 47 48 if (flags) 49 dout("unused open flags: %x\n", flags); 50 51 return cpu_to_le32(wire_flags); 52 } 53 54 /* 55 * Ceph file operations 56 * 57 * Implement basic open/close functionality, and implement 58 * read/write. 59 * 60 * We implement three modes of file I/O: 61 * - buffered uses the generic_file_aio_{read,write} helpers 62 * 63 * - synchronous is used when there is multi-client read/write 64 * sharing, avoids the page cache, and synchronously waits for an 65 * ack from the OSD. 66 * 67 * - direct io takes the variant of the sync path that references 68 * user pages directly. 69 * 70 * fsync() flushes and waits on dirty pages, but just queues metadata 71 * for writeback: since the MDS can recover size and mtime there is no 72 * need to wait for MDS acknowledgement. 73 */ 74 75 /* 76 * How many pages to get in one call to iov_iter_get_pages(). This 77 * determines the size of the on-stack array used as a buffer. 78 */ 79 #define ITER_GET_BVECS_PAGES 64 80 81 static ssize_t __iter_get_bvecs(struct iov_iter *iter, size_t maxsize, 82 struct bio_vec *bvecs) 83 { 84 size_t size = 0; 85 int bvec_idx = 0; 86 87 if (maxsize > iov_iter_count(iter)) 88 maxsize = iov_iter_count(iter); 89 90 while (size < maxsize) { 91 struct page *pages[ITER_GET_BVECS_PAGES]; 92 ssize_t bytes; 93 size_t start; 94 int idx = 0; 95 96 bytes = iov_iter_get_pages(iter, pages, maxsize - size, 97 ITER_GET_BVECS_PAGES, &start); 98 if (bytes < 0) 99 return size ?: bytes; 100 101 iov_iter_advance(iter, bytes); 102 size += bytes; 103 104 for ( ; bytes; idx++, bvec_idx++) { 105 struct bio_vec bv = { 106 .bv_page = pages[idx], 107 .bv_len = min_t(int, bytes, PAGE_SIZE - start), 108 .bv_offset = start, 109 }; 110 111 bvecs[bvec_idx] = bv; 112 bytes -= bv.bv_len; 113 start = 0; 114 } 115 } 116 117 return size; 118 } 119 120 /* 121 * iov_iter_get_pages() only considers one iov_iter segment, no matter 122 * what maxsize or maxpages are given. For ITER_BVEC that is a single 123 * page. 124 * 125 * Attempt to get up to @maxsize bytes worth of pages from @iter. 126 * Return the number of bytes in the created bio_vec array, or an error. 127 */ 128 static ssize_t iter_get_bvecs_alloc(struct iov_iter *iter, size_t maxsize, 129 struct bio_vec **bvecs, int *num_bvecs) 130 { 131 struct bio_vec *bv; 132 size_t orig_count = iov_iter_count(iter); 133 ssize_t bytes; 134 int npages; 135 136 iov_iter_truncate(iter, maxsize); 137 npages = iov_iter_npages(iter, INT_MAX); 138 iov_iter_reexpand(iter, orig_count); 139 140 /* 141 * __iter_get_bvecs() may populate only part of the array -- zero it 142 * out. 143 */ 144 bv = kvmalloc_array(npages, sizeof(*bv), GFP_KERNEL | __GFP_ZERO); 145 if (!bv) 146 return -ENOMEM; 147 148 bytes = __iter_get_bvecs(iter, maxsize, bv); 149 if (bytes < 0) { 150 /* 151 * No pages were pinned -- just free the array. 152 */ 153 kvfree(bv); 154 return bytes; 155 } 156 157 *bvecs = bv; 158 *num_bvecs = npages; 159 return bytes; 160 } 161 162 static void put_bvecs(struct bio_vec *bvecs, int num_bvecs, bool should_dirty) 163 { 164 int i; 165 166 for (i = 0; i < num_bvecs; i++) { 167 if (bvecs[i].bv_page) { 168 if (should_dirty) 169 set_page_dirty_lock(bvecs[i].bv_page); 170 put_page(bvecs[i].bv_page); 171 } 172 } 173 kvfree(bvecs); 174 } 175 176 /* 177 * Prepare an open request. Preallocate ceph_cap to avoid an 178 * inopportune ENOMEM later. 179 */ 180 static struct ceph_mds_request * 181 prepare_open_request(struct super_block *sb, int flags, int create_mode) 182 { 183 struct ceph_fs_client *fsc = ceph_sb_to_client(sb); 184 struct ceph_mds_client *mdsc = fsc->mdsc; 185 struct ceph_mds_request *req; 186 int want_auth = USE_ANY_MDS; 187 int op = (flags & O_CREAT) ? CEPH_MDS_OP_CREATE : CEPH_MDS_OP_OPEN; 188 189 if (flags & (O_WRONLY|O_RDWR|O_CREAT|O_TRUNC)) 190 want_auth = USE_AUTH_MDS; 191 192 req = ceph_mdsc_create_request(mdsc, op, want_auth); 193 if (IS_ERR(req)) 194 goto out; 195 req->r_fmode = ceph_flags_to_mode(flags); 196 req->r_args.open.flags = ceph_flags_sys2wire(flags); 197 req->r_args.open.mode = cpu_to_le32(create_mode); 198 out: 199 return req; 200 } 201 202 static int ceph_init_file_info(struct inode *inode, struct file *file, 203 int fmode, bool isdir) 204 { 205 struct ceph_inode_info *ci = ceph_inode(inode); 206 struct ceph_file_info *fi; 207 208 dout("%s %p %p 0%o (%s)\n", __func__, inode, file, 209 inode->i_mode, isdir ? "dir" : "regular"); 210 BUG_ON(inode->i_fop->release != ceph_release); 211 212 if (isdir) { 213 struct ceph_dir_file_info *dfi = 214 kmem_cache_zalloc(ceph_dir_file_cachep, GFP_KERNEL); 215 if (!dfi) { 216 ceph_put_fmode(ci, fmode); /* clean up */ 217 return -ENOMEM; 218 } 219 220 file->private_data = dfi; 221 fi = &dfi->file_info; 222 dfi->next_offset = 2; 223 dfi->readdir_cache_idx = -1; 224 } else { 225 fi = kmem_cache_zalloc(ceph_file_cachep, GFP_KERNEL); 226 if (!fi) { 227 ceph_put_fmode(ci, fmode); /* clean up */ 228 return -ENOMEM; 229 } 230 231 file->private_data = fi; 232 } 233 234 fi->fmode = fmode; 235 spin_lock_init(&fi->rw_contexts_lock); 236 INIT_LIST_HEAD(&fi->rw_contexts); 237 fi->meta_err = errseq_sample(&ci->i_meta_err); 238 fi->filp_gen = READ_ONCE(ceph_inode_to_client(inode)->filp_gen); 239 240 return 0; 241 } 242 243 /* 244 * initialize private struct file data. 245 * if we fail, clean up by dropping fmode reference on the ceph_inode 246 */ 247 static int ceph_init_file(struct inode *inode, struct file *file, int fmode) 248 { 249 int ret = 0; 250 251 switch (inode->i_mode & S_IFMT) { 252 case S_IFREG: 253 ceph_fscache_register_inode_cookie(inode); 254 ceph_fscache_file_set_cookie(inode, file); 255 /* fall through */ 256 case S_IFDIR: 257 ret = ceph_init_file_info(inode, file, fmode, 258 S_ISDIR(inode->i_mode)); 259 if (ret) 260 return ret; 261 break; 262 263 case S_IFLNK: 264 dout("init_file %p %p 0%o (symlink)\n", inode, file, 265 inode->i_mode); 266 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */ 267 break; 268 269 default: 270 dout("init_file %p %p 0%o (special)\n", inode, file, 271 inode->i_mode); 272 /* 273 * we need to drop the open ref now, since we don't 274 * have .release set to ceph_release. 275 */ 276 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */ 277 BUG_ON(inode->i_fop->release == ceph_release); 278 279 /* call the proper open fop */ 280 ret = inode->i_fop->open(inode, file); 281 } 282 return ret; 283 } 284 285 /* 286 * try renew caps after session gets killed. 287 */ 288 int ceph_renew_caps(struct inode *inode) 289 { 290 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc; 291 struct ceph_inode_info *ci = ceph_inode(inode); 292 struct ceph_mds_request *req; 293 int err, flags, wanted; 294 295 spin_lock(&ci->i_ceph_lock); 296 wanted = __ceph_caps_file_wanted(ci); 297 if (__ceph_is_any_real_caps(ci) && 298 (!(wanted & CEPH_CAP_ANY_WR) || ci->i_auth_cap)) { 299 int issued = __ceph_caps_issued(ci, NULL); 300 spin_unlock(&ci->i_ceph_lock); 301 dout("renew caps %p want %s issued %s updating mds_wanted\n", 302 inode, ceph_cap_string(wanted), ceph_cap_string(issued)); 303 ceph_check_caps(ci, 0, NULL); 304 return 0; 305 } 306 spin_unlock(&ci->i_ceph_lock); 307 308 flags = 0; 309 if ((wanted & CEPH_CAP_FILE_RD) && (wanted & CEPH_CAP_FILE_WR)) 310 flags = O_RDWR; 311 else if (wanted & CEPH_CAP_FILE_RD) 312 flags = O_RDONLY; 313 else if (wanted & CEPH_CAP_FILE_WR) 314 flags = O_WRONLY; 315 #ifdef O_LAZY 316 if (wanted & CEPH_CAP_FILE_LAZYIO) 317 flags |= O_LAZY; 318 #endif 319 320 req = prepare_open_request(inode->i_sb, flags, 0); 321 if (IS_ERR(req)) { 322 err = PTR_ERR(req); 323 goto out; 324 } 325 326 req->r_inode = inode; 327 ihold(inode); 328 req->r_num_caps = 1; 329 req->r_fmode = -1; 330 331 err = ceph_mdsc_do_request(mdsc, NULL, req); 332 ceph_mdsc_put_request(req); 333 out: 334 dout("renew caps %p open result=%d\n", inode, err); 335 return err < 0 ? err : 0; 336 } 337 338 /* 339 * If we already have the requisite capabilities, we can satisfy 340 * the open request locally (no need to request new caps from the 341 * MDS). We do, however, need to inform the MDS (asynchronously) 342 * if our wanted caps set expands. 343 */ 344 int ceph_open(struct inode *inode, struct file *file) 345 { 346 struct ceph_inode_info *ci = ceph_inode(inode); 347 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb); 348 struct ceph_mds_client *mdsc = fsc->mdsc; 349 struct ceph_mds_request *req; 350 struct ceph_file_info *fi = file->private_data; 351 int err; 352 int flags, fmode, wanted; 353 354 if (fi) { 355 dout("open file %p is already opened\n", file); 356 return 0; 357 } 358 359 /* filter out O_CREAT|O_EXCL; vfs did that already. yuck. */ 360 flags = file->f_flags & ~(O_CREAT|O_EXCL); 361 if (S_ISDIR(inode->i_mode)) 362 flags = O_DIRECTORY; /* mds likes to know */ 363 364 dout("open inode %p ino %llx.%llx file %p flags %d (%d)\n", inode, 365 ceph_vinop(inode), file, flags, file->f_flags); 366 fmode = ceph_flags_to_mode(flags); 367 wanted = ceph_caps_for_mode(fmode); 368 369 /* snapped files are read-only */ 370 if (ceph_snap(inode) != CEPH_NOSNAP && (file->f_mode & FMODE_WRITE)) 371 return -EROFS; 372 373 /* trivially open snapdir */ 374 if (ceph_snap(inode) == CEPH_SNAPDIR) { 375 spin_lock(&ci->i_ceph_lock); 376 __ceph_get_fmode(ci, fmode); 377 spin_unlock(&ci->i_ceph_lock); 378 return ceph_init_file(inode, file, fmode); 379 } 380 381 /* 382 * No need to block if we have caps on the auth MDS (for 383 * write) or any MDS (for read). Update wanted set 384 * asynchronously. 385 */ 386 spin_lock(&ci->i_ceph_lock); 387 if (__ceph_is_any_real_caps(ci) && 388 (((fmode & CEPH_FILE_MODE_WR) == 0) || ci->i_auth_cap)) { 389 int mds_wanted = __ceph_caps_mds_wanted(ci, true); 390 int issued = __ceph_caps_issued(ci, NULL); 391 392 dout("open %p fmode %d want %s issued %s using existing\n", 393 inode, fmode, ceph_cap_string(wanted), 394 ceph_cap_string(issued)); 395 __ceph_get_fmode(ci, fmode); 396 spin_unlock(&ci->i_ceph_lock); 397 398 /* adjust wanted? */ 399 if ((issued & wanted) != wanted && 400 (mds_wanted & wanted) != wanted && 401 ceph_snap(inode) != CEPH_SNAPDIR) 402 ceph_check_caps(ci, 0, NULL); 403 404 return ceph_init_file(inode, file, fmode); 405 } else if (ceph_snap(inode) != CEPH_NOSNAP && 406 (ci->i_snap_caps & wanted) == wanted) { 407 __ceph_get_fmode(ci, fmode); 408 spin_unlock(&ci->i_ceph_lock); 409 return ceph_init_file(inode, file, fmode); 410 } 411 412 spin_unlock(&ci->i_ceph_lock); 413 414 dout("open fmode %d wants %s\n", fmode, ceph_cap_string(wanted)); 415 req = prepare_open_request(inode->i_sb, flags, 0); 416 if (IS_ERR(req)) { 417 err = PTR_ERR(req); 418 goto out; 419 } 420 req->r_inode = inode; 421 ihold(inode); 422 423 req->r_num_caps = 1; 424 err = ceph_mdsc_do_request(mdsc, NULL, req); 425 if (!err) 426 err = ceph_init_file(inode, file, req->r_fmode); 427 ceph_mdsc_put_request(req); 428 dout("open result=%d on %llx.%llx\n", err, ceph_vinop(inode)); 429 out: 430 return err; 431 } 432 433 434 /* 435 * Do a lookup + open with a single request. If we get a non-existent 436 * file or symlink, return 1 so the VFS can retry. 437 */ 438 int ceph_atomic_open(struct inode *dir, struct dentry *dentry, 439 struct file *file, unsigned flags, umode_t mode) 440 { 441 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); 442 struct ceph_mds_client *mdsc = fsc->mdsc; 443 struct ceph_mds_request *req; 444 struct dentry *dn; 445 struct ceph_acl_sec_ctx as_ctx = {}; 446 int mask; 447 int err; 448 449 dout("atomic_open %p dentry %p '%pd' %s flags %d mode 0%o\n", 450 dir, dentry, dentry, 451 d_unhashed(dentry) ? "unhashed" : "hashed", flags, mode); 452 453 if (dentry->d_name.len > NAME_MAX) 454 return -ENAMETOOLONG; 455 456 if (flags & O_CREAT) { 457 if (ceph_quota_is_max_files_exceeded(dir)) 458 return -EDQUOT; 459 err = ceph_pre_init_acls(dir, &mode, &as_ctx); 460 if (err < 0) 461 return err; 462 err = ceph_security_init_secctx(dentry, mode, &as_ctx); 463 if (err < 0) 464 goto out_ctx; 465 } else if (!d_in_lookup(dentry)) { 466 /* If it's not being looked up, it's negative */ 467 return -ENOENT; 468 } 469 470 /* do the open */ 471 req = prepare_open_request(dir->i_sb, flags, mode); 472 if (IS_ERR(req)) { 473 err = PTR_ERR(req); 474 goto out_ctx; 475 } 476 req->r_dentry = dget(dentry); 477 req->r_num_caps = 2; 478 if (flags & O_CREAT) { 479 req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL; 480 req->r_dentry_unless = CEPH_CAP_FILE_EXCL; 481 if (as_ctx.pagelist) { 482 req->r_pagelist = as_ctx.pagelist; 483 as_ctx.pagelist = NULL; 484 } 485 } 486 487 mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED; 488 if (ceph_security_xattr_wanted(dir)) 489 mask |= CEPH_CAP_XATTR_SHARED; 490 req->r_args.open.mask = cpu_to_le32(mask); 491 492 req->r_parent = dir; 493 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); 494 err = ceph_mdsc_do_request(mdsc, 495 (flags & (O_CREAT|O_TRUNC)) ? dir : NULL, 496 req); 497 err = ceph_handle_snapdir(req, dentry, err); 498 if (err) 499 goto out_req; 500 501 if ((flags & O_CREAT) && !req->r_reply_info.head->is_dentry) 502 err = ceph_handle_notrace_create(dir, dentry); 503 504 if (d_in_lookup(dentry)) { 505 dn = ceph_finish_lookup(req, dentry, err); 506 if (IS_ERR(dn)) 507 err = PTR_ERR(dn); 508 } else { 509 /* we were given a hashed negative dentry */ 510 dn = NULL; 511 } 512 if (err) 513 goto out_req; 514 if (dn || d_really_is_negative(dentry) || d_is_symlink(dentry)) { 515 /* make vfs retry on splice, ENOENT, or symlink */ 516 dout("atomic_open finish_no_open on dn %p\n", dn); 517 err = finish_no_open(file, dn); 518 } else { 519 dout("atomic_open finish_open on dn %p\n", dn); 520 if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) { 521 ceph_init_inode_acls(d_inode(dentry), &as_ctx); 522 file->f_mode |= FMODE_CREATED; 523 } 524 err = finish_open(file, dentry, ceph_open); 525 } 526 out_req: 527 if (!req->r_err && req->r_target_inode) 528 ceph_put_fmode(ceph_inode(req->r_target_inode), req->r_fmode); 529 ceph_mdsc_put_request(req); 530 out_ctx: 531 ceph_release_acl_sec_ctx(&as_ctx); 532 dout("atomic_open result=%d\n", err); 533 return err; 534 } 535 536 int ceph_release(struct inode *inode, struct file *file) 537 { 538 struct ceph_inode_info *ci = ceph_inode(inode); 539 540 if (S_ISDIR(inode->i_mode)) { 541 struct ceph_dir_file_info *dfi = file->private_data; 542 dout("release inode %p dir file %p\n", inode, file); 543 WARN_ON(!list_empty(&dfi->file_info.rw_contexts)); 544 545 ceph_put_fmode(ci, dfi->file_info.fmode); 546 547 if (dfi->last_readdir) 548 ceph_mdsc_put_request(dfi->last_readdir); 549 kfree(dfi->last_name); 550 kfree(dfi->dir_info); 551 kmem_cache_free(ceph_dir_file_cachep, dfi); 552 } else { 553 struct ceph_file_info *fi = file->private_data; 554 dout("release inode %p regular file %p\n", inode, file); 555 WARN_ON(!list_empty(&fi->rw_contexts)); 556 557 ceph_put_fmode(ci, fi->fmode); 558 kmem_cache_free(ceph_file_cachep, fi); 559 } 560 561 /* wake up anyone waiting for caps on this inode */ 562 wake_up_all(&ci->i_cap_wq); 563 return 0; 564 } 565 566 enum { 567 HAVE_RETRIED = 1, 568 CHECK_EOF = 2, 569 READ_INLINE = 3, 570 }; 571 572 /* 573 * Completely synchronous read and write methods. Direct from __user 574 * buffer to osd, or directly to user pages (if O_DIRECT). 575 * 576 * If the read spans object boundary, just do multiple reads. (That's not 577 * atomic, but good enough for now.) 578 * 579 * If we get a short result from the OSD, check against i_size; we need to 580 * only return a short read to the caller if we hit EOF. 581 */ 582 static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *to, 583 int *retry_op) 584 { 585 struct file *file = iocb->ki_filp; 586 struct inode *inode = file_inode(file); 587 struct ceph_inode_info *ci = ceph_inode(inode); 588 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 589 struct ceph_osd_client *osdc = &fsc->client->osdc; 590 ssize_t ret; 591 u64 off = iocb->ki_pos; 592 u64 len = iov_iter_count(to); 593 594 dout("sync_read on file %p %llu~%u %s\n", file, off, (unsigned)len, 595 (file->f_flags & O_DIRECT) ? "O_DIRECT" : ""); 596 597 if (!len) 598 return 0; 599 /* 600 * flush any page cache pages in this range. this 601 * will make concurrent normal and sync io slow, 602 * but it will at least behave sensibly when they are 603 * in sequence. 604 */ 605 ret = filemap_write_and_wait_range(inode->i_mapping, 606 off, off + len - 1); 607 if (ret < 0) 608 return ret; 609 610 ret = 0; 611 while ((len = iov_iter_count(to)) > 0) { 612 struct ceph_osd_request *req; 613 struct page **pages; 614 int num_pages; 615 size_t page_off; 616 u64 i_size; 617 bool more; 618 619 req = ceph_osdc_new_request(osdc, &ci->i_layout, 620 ci->i_vino, off, &len, 0, 1, 621 CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ, 622 NULL, ci->i_truncate_seq, 623 ci->i_truncate_size, false); 624 if (IS_ERR(req)) { 625 ret = PTR_ERR(req); 626 break; 627 } 628 629 more = len < iov_iter_count(to); 630 631 if (unlikely(iov_iter_is_pipe(to))) { 632 ret = iov_iter_get_pages_alloc(to, &pages, len, 633 &page_off); 634 if (ret <= 0) { 635 ceph_osdc_put_request(req); 636 ret = -ENOMEM; 637 break; 638 } 639 num_pages = DIV_ROUND_UP(ret + page_off, PAGE_SIZE); 640 if (ret < len) { 641 len = ret; 642 osd_req_op_extent_update(req, 0, len); 643 more = false; 644 } 645 } else { 646 num_pages = calc_pages_for(off, len); 647 page_off = off & ~PAGE_MASK; 648 pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL); 649 if (IS_ERR(pages)) { 650 ceph_osdc_put_request(req); 651 ret = PTR_ERR(pages); 652 break; 653 } 654 } 655 656 osd_req_op_extent_osd_data_pages(req, 0, pages, len, page_off, 657 false, false); 658 ret = ceph_osdc_start_request(osdc, req, false); 659 if (!ret) 660 ret = ceph_osdc_wait_request(osdc, req); 661 ceph_osdc_put_request(req); 662 663 i_size = i_size_read(inode); 664 dout("sync_read %llu~%llu got %zd i_size %llu%s\n", 665 off, len, ret, i_size, (more ? " MORE" : "")); 666 667 if (ret == -ENOENT) 668 ret = 0; 669 if (ret >= 0 && ret < len && (off + ret < i_size)) { 670 int zlen = min(len - ret, i_size - off - ret); 671 int zoff = page_off + ret; 672 dout("sync_read zero gap %llu~%llu\n", 673 off + ret, off + ret + zlen); 674 ceph_zero_page_vector_range(zoff, zlen, pages); 675 ret += zlen; 676 } 677 678 if (unlikely(iov_iter_is_pipe(to))) { 679 if (ret > 0) { 680 iov_iter_advance(to, ret); 681 off += ret; 682 } else { 683 iov_iter_advance(to, 0); 684 } 685 ceph_put_page_vector(pages, num_pages, false); 686 } else { 687 int idx = 0; 688 size_t left = ret > 0 ? ret : 0; 689 while (left > 0) { 690 size_t len, copied; 691 page_off = off & ~PAGE_MASK; 692 len = min_t(size_t, left, PAGE_SIZE - page_off); 693 copied = copy_page_to_iter(pages[idx++], 694 page_off, len, to); 695 off += copied; 696 left -= copied; 697 if (copied < len) { 698 ret = -EFAULT; 699 break; 700 } 701 } 702 ceph_release_page_vector(pages, num_pages); 703 } 704 705 if (ret < 0) { 706 if (ret == -EBLACKLISTED) 707 fsc->blacklisted = true; 708 break; 709 } 710 711 if (off >= i_size || !more) 712 break; 713 } 714 715 if (off > iocb->ki_pos) { 716 if (ret >= 0 && 717 iov_iter_count(to) > 0 && off >= i_size_read(inode)) 718 *retry_op = CHECK_EOF; 719 ret = off - iocb->ki_pos; 720 iocb->ki_pos = off; 721 } 722 723 dout("sync_read result %zd retry_op %d\n", ret, *retry_op); 724 return ret; 725 } 726 727 struct ceph_aio_request { 728 struct kiocb *iocb; 729 size_t total_len; 730 bool write; 731 bool should_dirty; 732 int error; 733 struct list_head osd_reqs; 734 unsigned num_reqs; 735 atomic_t pending_reqs; 736 struct timespec64 mtime; 737 struct ceph_cap_flush *prealloc_cf; 738 }; 739 740 struct ceph_aio_work { 741 struct work_struct work; 742 struct ceph_osd_request *req; 743 }; 744 745 static void ceph_aio_retry_work(struct work_struct *work); 746 747 static void ceph_aio_complete(struct inode *inode, 748 struct ceph_aio_request *aio_req) 749 { 750 struct ceph_inode_info *ci = ceph_inode(inode); 751 int ret; 752 753 if (!atomic_dec_and_test(&aio_req->pending_reqs)) 754 return; 755 756 if (aio_req->iocb->ki_flags & IOCB_DIRECT) 757 inode_dio_end(inode); 758 759 ret = aio_req->error; 760 if (!ret) 761 ret = aio_req->total_len; 762 763 dout("ceph_aio_complete %p rc %d\n", inode, ret); 764 765 if (ret >= 0 && aio_req->write) { 766 int dirty; 767 768 loff_t endoff = aio_req->iocb->ki_pos + aio_req->total_len; 769 if (endoff > i_size_read(inode)) { 770 if (ceph_inode_set_size(inode, endoff)) 771 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL); 772 } 773 774 spin_lock(&ci->i_ceph_lock); 775 ci->i_inline_version = CEPH_INLINE_NONE; 776 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR, 777 &aio_req->prealloc_cf); 778 spin_unlock(&ci->i_ceph_lock); 779 if (dirty) 780 __mark_inode_dirty(inode, dirty); 781 782 } 783 784 ceph_put_cap_refs(ci, (aio_req->write ? CEPH_CAP_FILE_WR : 785 CEPH_CAP_FILE_RD)); 786 787 aio_req->iocb->ki_complete(aio_req->iocb, ret, 0); 788 789 ceph_free_cap_flush(aio_req->prealloc_cf); 790 kfree(aio_req); 791 } 792 793 static void ceph_aio_complete_req(struct ceph_osd_request *req) 794 { 795 int rc = req->r_result; 796 struct inode *inode = req->r_inode; 797 struct ceph_aio_request *aio_req = req->r_priv; 798 struct ceph_osd_data *osd_data = osd_req_op_extent_osd_data(req, 0); 799 800 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_BVECS); 801 BUG_ON(!osd_data->num_bvecs); 802 803 dout("ceph_aio_complete_req %p rc %d bytes %u\n", 804 inode, rc, osd_data->bvec_pos.iter.bi_size); 805 806 if (rc == -EOLDSNAPC) { 807 struct ceph_aio_work *aio_work; 808 BUG_ON(!aio_req->write); 809 810 aio_work = kmalloc(sizeof(*aio_work), GFP_NOFS); 811 if (aio_work) { 812 INIT_WORK(&aio_work->work, ceph_aio_retry_work); 813 aio_work->req = req; 814 queue_work(ceph_inode_to_client(inode)->inode_wq, 815 &aio_work->work); 816 return; 817 } 818 rc = -ENOMEM; 819 } else if (!aio_req->write) { 820 if (rc == -ENOENT) 821 rc = 0; 822 if (rc >= 0 && osd_data->bvec_pos.iter.bi_size > rc) { 823 struct iov_iter i; 824 int zlen = osd_data->bvec_pos.iter.bi_size - rc; 825 826 /* 827 * If read is satisfied by single OSD request, 828 * it can pass EOF. Otherwise read is within 829 * i_size. 830 */ 831 if (aio_req->num_reqs == 1) { 832 loff_t i_size = i_size_read(inode); 833 loff_t endoff = aio_req->iocb->ki_pos + rc; 834 if (endoff < i_size) 835 zlen = min_t(size_t, zlen, 836 i_size - endoff); 837 aio_req->total_len = rc + zlen; 838 } 839 840 iov_iter_bvec(&i, READ, osd_data->bvec_pos.bvecs, 841 osd_data->num_bvecs, 842 osd_data->bvec_pos.iter.bi_size); 843 iov_iter_advance(&i, rc); 844 iov_iter_zero(zlen, &i); 845 } 846 } 847 848 put_bvecs(osd_data->bvec_pos.bvecs, osd_data->num_bvecs, 849 aio_req->should_dirty); 850 ceph_osdc_put_request(req); 851 852 if (rc < 0) 853 cmpxchg(&aio_req->error, 0, rc); 854 855 ceph_aio_complete(inode, aio_req); 856 return; 857 } 858 859 static void ceph_aio_retry_work(struct work_struct *work) 860 { 861 struct ceph_aio_work *aio_work = 862 container_of(work, struct ceph_aio_work, work); 863 struct ceph_osd_request *orig_req = aio_work->req; 864 struct ceph_aio_request *aio_req = orig_req->r_priv; 865 struct inode *inode = orig_req->r_inode; 866 struct ceph_inode_info *ci = ceph_inode(inode); 867 struct ceph_snap_context *snapc; 868 struct ceph_osd_request *req; 869 int ret; 870 871 spin_lock(&ci->i_ceph_lock); 872 if (__ceph_have_pending_cap_snap(ci)) { 873 struct ceph_cap_snap *capsnap = 874 list_last_entry(&ci->i_cap_snaps, 875 struct ceph_cap_snap, 876 ci_item); 877 snapc = ceph_get_snap_context(capsnap->context); 878 } else { 879 BUG_ON(!ci->i_head_snapc); 880 snapc = ceph_get_snap_context(ci->i_head_snapc); 881 } 882 spin_unlock(&ci->i_ceph_lock); 883 884 req = ceph_osdc_alloc_request(orig_req->r_osdc, snapc, 1, 885 false, GFP_NOFS); 886 if (!req) { 887 ret = -ENOMEM; 888 req = orig_req; 889 goto out; 890 } 891 892 req->r_flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE; 893 ceph_oloc_copy(&req->r_base_oloc, &orig_req->r_base_oloc); 894 ceph_oid_copy(&req->r_base_oid, &orig_req->r_base_oid); 895 896 req->r_ops[0] = orig_req->r_ops[0]; 897 898 req->r_mtime = aio_req->mtime; 899 req->r_data_offset = req->r_ops[0].extent.offset; 900 901 ret = ceph_osdc_alloc_messages(req, GFP_NOFS); 902 if (ret) { 903 ceph_osdc_put_request(req); 904 req = orig_req; 905 goto out; 906 } 907 908 ceph_osdc_put_request(orig_req); 909 910 req->r_callback = ceph_aio_complete_req; 911 req->r_inode = inode; 912 req->r_priv = aio_req; 913 914 ret = ceph_osdc_start_request(req->r_osdc, req, false); 915 out: 916 if (ret < 0) { 917 req->r_result = ret; 918 ceph_aio_complete_req(req); 919 } 920 921 ceph_put_snap_context(snapc); 922 kfree(aio_work); 923 } 924 925 static ssize_t 926 ceph_direct_read_write(struct kiocb *iocb, struct iov_iter *iter, 927 struct ceph_snap_context *snapc, 928 struct ceph_cap_flush **pcf) 929 { 930 struct file *file = iocb->ki_filp; 931 struct inode *inode = file_inode(file); 932 struct ceph_inode_info *ci = ceph_inode(inode); 933 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 934 struct ceph_vino vino; 935 struct ceph_osd_request *req; 936 struct bio_vec *bvecs; 937 struct ceph_aio_request *aio_req = NULL; 938 int num_pages = 0; 939 int flags; 940 int ret = 0; 941 struct timespec64 mtime = current_time(inode); 942 size_t count = iov_iter_count(iter); 943 loff_t pos = iocb->ki_pos; 944 bool write = iov_iter_rw(iter) == WRITE; 945 bool should_dirty = !write && iter_is_iovec(iter); 946 947 if (write && ceph_snap(file_inode(file)) != CEPH_NOSNAP) 948 return -EROFS; 949 950 dout("sync_direct_%s on file %p %lld~%u snapc %p seq %lld\n", 951 (write ? "write" : "read"), file, pos, (unsigned)count, 952 snapc, snapc ? snapc->seq : 0); 953 954 if (write) { 955 int ret2 = invalidate_inode_pages2_range(inode->i_mapping, 956 pos >> PAGE_SHIFT, 957 (pos + count - 1) >> PAGE_SHIFT); 958 if (ret2 < 0) 959 dout("invalidate_inode_pages2_range returned %d\n", ret2); 960 961 flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE; 962 } else { 963 flags = CEPH_OSD_FLAG_READ; 964 } 965 966 while (iov_iter_count(iter) > 0) { 967 u64 size = iov_iter_count(iter); 968 ssize_t len; 969 970 if (write) 971 size = min_t(u64, size, fsc->mount_options->wsize); 972 else 973 size = min_t(u64, size, fsc->mount_options->rsize); 974 975 vino = ceph_vino(inode); 976 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, 977 vino, pos, &size, 0, 978 1, 979 write ? CEPH_OSD_OP_WRITE : 980 CEPH_OSD_OP_READ, 981 flags, snapc, 982 ci->i_truncate_seq, 983 ci->i_truncate_size, 984 false); 985 if (IS_ERR(req)) { 986 ret = PTR_ERR(req); 987 break; 988 } 989 990 len = iter_get_bvecs_alloc(iter, size, &bvecs, &num_pages); 991 if (len < 0) { 992 ceph_osdc_put_request(req); 993 ret = len; 994 break; 995 } 996 if (len != size) 997 osd_req_op_extent_update(req, 0, len); 998 999 /* 1000 * To simplify error handling, allow AIO when IO within i_size 1001 * or IO can be satisfied by single OSD request. 1002 */ 1003 if (pos == iocb->ki_pos && !is_sync_kiocb(iocb) && 1004 (len == count || pos + count <= i_size_read(inode))) { 1005 aio_req = kzalloc(sizeof(*aio_req), GFP_KERNEL); 1006 if (aio_req) { 1007 aio_req->iocb = iocb; 1008 aio_req->write = write; 1009 aio_req->should_dirty = should_dirty; 1010 INIT_LIST_HEAD(&aio_req->osd_reqs); 1011 if (write) { 1012 aio_req->mtime = mtime; 1013 swap(aio_req->prealloc_cf, *pcf); 1014 } 1015 } 1016 /* ignore error */ 1017 } 1018 1019 if (write) { 1020 /* 1021 * throw out any page cache pages in this range. this 1022 * may block. 1023 */ 1024 truncate_inode_pages_range(inode->i_mapping, pos, 1025 PAGE_ALIGN(pos + len) - 1); 1026 1027 req->r_mtime = mtime; 1028 } 1029 1030 osd_req_op_extent_osd_data_bvecs(req, 0, bvecs, num_pages, len); 1031 1032 if (aio_req) { 1033 aio_req->total_len += len; 1034 aio_req->num_reqs++; 1035 atomic_inc(&aio_req->pending_reqs); 1036 1037 req->r_callback = ceph_aio_complete_req; 1038 req->r_inode = inode; 1039 req->r_priv = aio_req; 1040 list_add_tail(&req->r_private_item, &aio_req->osd_reqs); 1041 1042 pos += len; 1043 continue; 1044 } 1045 1046 ret = ceph_osdc_start_request(req->r_osdc, req, false); 1047 if (!ret) 1048 ret = ceph_osdc_wait_request(&fsc->client->osdc, req); 1049 1050 size = i_size_read(inode); 1051 if (!write) { 1052 if (ret == -ENOENT) 1053 ret = 0; 1054 if (ret >= 0 && ret < len && pos + ret < size) { 1055 struct iov_iter i; 1056 int zlen = min_t(size_t, len - ret, 1057 size - pos - ret); 1058 1059 iov_iter_bvec(&i, READ, bvecs, num_pages, len); 1060 iov_iter_advance(&i, ret); 1061 iov_iter_zero(zlen, &i); 1062 ret += zlen; 1063 } 1064 if (ret >= 0) 1065 len = ret; 1066 } 1067 1068 put_bvecs(bvecs, num_pages, should_dirty); 1069 ceph_osdc_put_request(req); 1070 if (ret < 0) 1071 break; 1072 1073 pos += len; 1074 if (!write && pos >= size) 1075 break; 1076 1077 if (write && pos > size) { 1078 if (ceph_inode_set_size(inode, pos)) 1079 ceph_check_caps(ceph_inode(inode), 1080 CHECK_CAPS_AUTHONLY, 1081 NULL); 1082 } 1083 } 1084 1085 if (aio_req) { 1086 LIST_HEAD(osd_reqs); 1087 1088 if (aio_req->num_reqs == 0) { 1089 kfree(aio_req); 1090 return ret; 1091 } 1092 1093 ceph_get_cap_refs(ci, write ? CEPH_CAP_FILE_WR : 1094 CEPH_CAP_FILE_RD); 1095 1096 list_splice(&aio_req->osd_reqs, &osd_reqs); 1097 inode_dio_begin(inode); 1098 while (!list_empty(&osd_reqs)) { 1099 req = list_first_entry(&osd_reqs, 1100 struct ceph_osd_request, 1101 r_private_item); 1102 list_del_init(&req->r_private_item); 1103 if (ret >= 0) 1104 ret = ceph_osdc_start_request(req->r_osdc, 1105 req, false); 1106 if (ret < 0) { 1107 req->r_result = ret; 1108 ceph_aio_complete_req(req); 1109 } 1110 } 1111 return -EIOCBQUEUED; 1112 } 1113 1114 if (ret != -EOLDSNAPC && pos > iocb->ki_pos) { 1115 ret = pos - iocb->ki_pos; 1116 iocb->ki_pos = pos; 1117 } 1118 return ret; 1119 } 1120 1121 /* 1122 * Synchronous write, straight from __user pointer or user pages. 1123 * 1124 * If write spans object boundary, just do multiple writes. (For a 1125 * correct atomic write, we should e.g. take write locks on all 1126 * objects, rollback on failure, etc.) 1127 */ 1128 static ssize_t 1129 ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos, 1130 struct ceph_snap_context *snapc) 1131 { 1132 struct file *file = iocb->ki_filp; 1133 struct inode *inode = file_inode(file); 1134 struct ceph_inode_info *ci = ceph_inode(inode); 1135 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 1136 struct ceph_vino vino; 1137 struct ceph_osd_request *req; 1138 struct page **pages; 1139 u64 len; 1140 int num_pages; 1141 int written = 0; 1142 int flags; 1143 int ret; 1144 bool check_caps = false; 1145 struct timespec64 mtime = current_time(inode); 1146 size_t count = iov_iter_count(from); 1147 1148 if (ceph_snap(file_inode(file)) != CEPH_NOSNAP) 1149 return -EROFS; 1150 1151 dout("sync_write on file %p %lld~%u snapc %p seq %lld\n", 1152 file, pos, (unsigned)count, snapc, snapc->seq); 1153 1154 ret = filemap_write_and_wait_range(inode->i_mapping, 1155 pos, pos + count - 1); 1156 if (ret < 0) 1157 return ret; 1158 1159 ret = invalidate_inode_pages2_range(inode->i_mapping, 1160 pos >> PAGE_SHIFT, 1161 (pos + count - 1) >> PAGE_SHIFT); 1162 if (ret < 0) 1163 dout("invalidate_inode_pages2_range returned %d\n", ret); 1164 1165 flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE; 1166 1167 while ((len = iov_iter_count(from)) > 0) { 1168 size_t left; 1169 int n; 1170 1171 vino = ceph_vino(inode); 1172 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, 1173 vino, pos, &len, 0, 1, 1174 CEPH_OSD_OP_WRITE, flags, snapc, 1175 ci->i_truncate_seq, 1176 ci->i_truncate_size, 1177 false); 1178 if (IS_ERR(req)) { 1179 ret = PTR_ERR(req); 1180 break; 1181 } 1182 1183 /* 1184 * write from beginning of first page, 1185 * regardless of io alignment 1186 */ 1187 num_pages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; 1188 1189 pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL); 1190 if (IS_ERR(pages)) { 1191 ret = PTR_ERR(pages); 1192 goto out; 1193 } 1194 1195 left = len; 1196 for (n = 0; n < num_pages; n++) { 1197 size_t plen = min_t(size_t, left, PAGE_SIZE); 1198 ret = copy_page_from_iter(pages[n], 0, plen, from); 1199 if (ret != plen) { 1200 ret = -EFAULT; 1201 break; 1202 } 1203 left -= ret; 1204 } 1205 1206 if (ret < 0) { 1207 ceph_release_page_vector(pages, num_pages); 1208 goto out; 1209 } 1210 1211 req->r_inode = inode; 1212 1213 osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, 1214 false, true); 1215 1216 req->r_mtime = mtime; 1217 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false); 1218 if (!ret) 1219 ret = ceph_osdc_wait_request(&fsc->client->osdc, req); 1220 1221 out: 1222 ceph_osdc_put_request(req); 1223 if (ret != 0) { 1224 ceph_set_error_write(ci); 1225 break; 1226 } 1227 1228 ceph_clear_error_write(ci); 1229 pos += len; 1230 written += len; 1231 if (pos > i_size_read(inode)) { 1232 check_caps = ceph_inode_set_size(inode, pos); 1233 if (check_caps) 1234 ceph_check_caps(ceph_inode(inode), 1235 CHECK_CAPS_AUTHONLY, 1236 NULL); 1237 } 1238 1239 } 1240 1241 if (ret != -EOLDSNAPC && written > 0) { 1242 ret = written; 1243 iocb->ki_pos = pos; 1244 } 1245 return ret; 1246 } 1247 1248 /* 1249 * Wrap generic_file_aio_read with checks for cap bits on the inode. 1250 * Atomically grab references, so that those bits are not released 1251 * back to the MDS mid-read. 1252 * 1253 * Hmm, the sync read case isn't actually async... should it be? 1254 */ 1255 static ssize_t ceph_read_iter(struct kiocb *iocb, struct iov_iter *to) 1256 { 1257 struct file *filp = iocb->ki_filp; 1258 struct ceph_file_info *fi = filp->private_data; 1259 size_t len = iov_iter_count(to); 1260 struct inode *inode = file_inode(filp); 1261 struct ceph_inode_info *ci = ceph_inode(inode); 1262 struct page *pinned_page = NULL; 1263 ssize_t ret; 1264 int want, got = 0; 1265 int retry_op = 0, read = 0; 1266 1267 again: 1268 dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n", 1269 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, inode); 1270 1271 if (iocb->ki_flags & IOCB_DIRECT) 1272 ceph_start_io_direct(inode); 1273 else 1274 ceph_start_io_read(inode); 1275 1276 if (fi->fmode & CEPH_FILE_MODE_LAZY) 1277 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO; 1278 else 1279 want = CEPH_CAP_FILE_CACHE; 1280 ret = ceph_get_caps(filp, CEPH_CAP_FILE_RD, want, -1, 1281 &got, &pinned_page); 1282 if (ret < 0) { 1283 if (iocb->ki_flags & IOCB_DIRECT) 1284 ceph_end_io_direct(inode); 1285 else 1286 ceph_end_io_read(inode); 1287 return ret; 1288 } 1289 1290 if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 || 1291 (iocb->ki_flags & IOCB_DIRECT) || 1292 (fi->flags & CEPH_F_SYNC)) { 1293 1294 dout("aio_sync_read %p %llx.%llx %llu~%u got cap refs on %s\n", 1295 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, 1296 ceph_cap_string(got)); 1297 1298 if (ci->i_inline_version == CEPH_INLINE_NONE) { 1299 if (!retry_op && (iocb->ki_flags & IOCB_DIRECT)) { 1300 ret = ceph_direct_read_write(iocb, to, 1301 NULL, NULL); 1302 if (ret >= 0 && ret < len) 1303 retry_op = CHECK_EOF; 1304 } else { 1305 ret = ceph_sync_read(iocb, to, &retry_op); 1306 } 1307 } else { 1308 retry_op = READ_INLINE; 1309 } 1310 } else { 1311 CEPH_DEFINE_RW_CONTEXT(rw_ctx, got); 1312 dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n", 1313 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, 1314 ceph_cap_string(got)); 1315 ceph_add_rw_context(fi, &rw_ctx); 1316 ret = generic_file_read_iter(iocb, to); 1317 ceph_del_rw_context(fi, &rw_ctx); 1318 } 1319 1320 dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n", 1321 inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret); 1322 if (pinned_page) { 1323 put_page(pinned_page); 1324 pinned_page = NULL; 1325 } 1326 ceph_put_cap_refs(ci, got); 1327 1328 if (iocb->ki_flags & IOCB_DIRECT) 1329 ceph_end_io_direct(inode); 1330 else 1331 ceph_end_io_read(inode); 1332 1333 if (retry_op > HAVE_RETRIED && ret >= 0) { 1334 int statret; 1335 struct page *page = NULL; 1336 loff_t i_size; 1337 if (retry_op == READ_INLINE) { 1338 page = __page_cache_alloc(GFP_KERNEL); 1339 if (!page) 1340 return -ENOMEM; 1341 } 1342 1343 statret = __ceph_do_getattr(inode, page, 1344 CEPH_STAT_CAP_INLINE_DATA, !!page); 1345 if (statret < 0) { 1346 if (page) 1347 __free_page(page); 1348 if (statret == -ENODATA) { 1349 BUG_ON(retry_op != READ_INLINE); 1350 goto again; 1351 } 1352 return statret; 1353 } 1354 1355 i_size = i_size_read(inode); 1356 if (retry_op == READ_INLINE) { 1357 BUG_ON(ret > 0 || read > 0); 1358 if (iocb->ki_pos < i_size && 1359 iocb->ki_pos < PAGE_SIZE) { 1360 loff_t end = min_t(loff_t, i_size, 1361 iocb->ki_pos + len); 1362 end = min_t(loff_t, end, PAGE_SIZE); 1363 if (statret < end) 1364 zero_user_segment(page, statret, end); 1365 ret = copy_page_to_iter(page, 1366 iocb->ki_pos & ~PAGE_MASK, 1367 end - iocb->ki_pos, to); 1368 iocb->ki_pos += ret; 1369 read += ret; 1370 } 1371 if (iocb->ki_pos < i_size && read < len) { 1372 size_t zlen = min_t(size_t, len - read, 1373 i_size - iocb->ki_pos); 1374 ret = iov_iter_zero(zlen, to); 1375 iocb->ki_pos += ret; 1376 read += ret; 1377 } 1378 __free_pages(page, 0); 1379 return read; 1380 } 1381 1382 /* hit EOF or hole? */ 1383 if (retry_op == CHECK_EOF && iocb->ki_pos < i_size && 1384 ret < len) { 1385 dout("sync_read hit hole, ppos %lld < size %lld" 1386 ", reading more\n", iocb->ki_pos, i_size); 1387 1388 read += ret; 1389 len -= ret; 1390 retry_op = HAVE_RETRIED; 1391 goto again; 1392 } 1393 } 1394 1395 if (ret >= 0) 1396 ret += read; 1397 1398 return ret; 1399 } 1400 1401 /* 1402 * Take cap references to avoid releasing caps to MDS mid-write. 1403 * 1404 * If we are synchronous, and write with an old snap context, the OSD 1405 * may return EOLDSNAPC. In that case, retry the write.. _after_ 1406 * dropping our cap refs and allowing the pending snap to logically 1407 * complete _before_ this write occurs. 1408 * 1409 * If we are near ENOSPC, write synchronously. 1410 */ 1411 static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from) 1412 { 1413 struct file *file = iocb->ki_filp; 1414 struct ceph_file_info *fi = file->private_data; 1415 struct inode *inode = file_inode(file); 1416 struct ceph_inode_info *ci = ceph_inode(inode); 1417 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 1418 struct ceph_cap_flush *prealloc_cf; 1419 ssize_t count, written = 0; 1420 int err, want, got; 1421 loff_t pos; 1422 loff_t limit = max(i_size_read(inode), fsc->max_file_size); 1423 1424 if (ceph_snap(inode) != CEPH_NOSNAP) 1425 return -EROFS; 1426 1427 prealloc_cf = ceph_alloc_cap_flush(); 1428 if (!prealloc_cf) 1429 return -ENOMEM; 1430 1431 retry_snap: 1432 if (iocb->ki_flags & IOCB_DIRECT) 1433 ceph_start_io_direct(inode); 1434 else 1435 ceph_start_io_write(inode); 1436 1437 /* We can write back this queue in page reclaim */ 1438 current->backing_dev_info = inode_to_bdi(inode); 1439 1440 if (iocb->ki_flags & IOCB_APPEND) { 1441 err = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false); 1442 if (err < 0) 1443 goto out; 1444 } 1445 1446 err = generic_write_checks(iocb, from); 1447 if (err <= 0) 1448 goto out; 1449 1450 pos = iocb->ki_pos; 1451 if (unlikely(pos >= limit)) { 1452 err = -EFBIG; 1453 goto out; 1454 } else { 1455 iov_iter_truncate(from, limit - pos); 1456 } 1457 1458 count = iov_iter_count(from); 1459 if (ceph_quota_is_max_bytes_exceeded(inode, pos + count)) { 1460 err = -EDQUOT; 1461 goto out; 1462 } 1463 1464 err = file_remove_privs(file); 1465 if (err) 1466 goto out; 1467 1468 err = file_update_time(file); 1469 if (err) 1470 goto out; 1471 1472 inode_inc_iversion_raw(inode); 1473 1474 if (ci->i_inline_version != CEPH_INLINE_NONE) { 1475 err = ceph_uninline_data(file, NULL); 1476 if (err < 0) 1477 goto out; 1478 } 1479 1480 /* FIXME: not complete since it doesn't account for being at quota */ 1481 if (ceph_osdmap_flag(&fsc->client->osdc, CEPH_OSDMAP_FULL)) { 1482 err = -ENOSPC; 1483 goto out; 1484 } 1485 1486 dout("aio_write %p %llx.%llx %llu~%zd getting caps. i_size %llu\n", 1487 inode, ceph_vinop(inode), pos, count, i_size_read(inode)); 1488 if (fi->fmode & CEPH_FILE_MODE_LAZY) 1489 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; 1490 else 1491 want = CEPH_CAP_FILE_BUFFER; 1492 got = 0; 1493 err = ceph_get_caps(file, CEPH_CAP_FILE_WR, want, pos + count, 1494 &got, NULL); 1495 if (err < 0) 1496 goto out; 1497 1498 dout("aio_write %p %llx.%llx %llu~%zd got cap refs on %s\n", 1499 inode, ceph_vinop(inode), pos, count, ceph_cap_string(got)); 1500 1501 if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 || 1502 (iocb->ki_flags & IOCB_DIRECT) || (fi->flags & CEPH_F_SYNC) || 1503 (ci->i_ceph_flags & CEPH_I_ERROR_WRITE)) { 1504 struct ceph_snap_context *snapc; 1505 struct iov_iter data; 1506 1507 spin_lock(&ci->i_ceph_lock); 1508 if (__ceph_have_pending_cap_snap(ci)) { 1509 struct ceph_cap_snap *capsnap = 1510 list_last_entry(&ci->i_cap_snaps, 1511 struct ceph_cap_snap, 1512 ci_item); 1513 snapc = ceph_get_snap_context(capsnap->context); 1514 } else { 1515 BUG_ON(!ci->i_head_snapc); 1516 snapc = ceph_get_snap_context(ci->i_head_snapc); 1517 } 1518 spin_unlock(&ci->i_ceph_lock); 1519 1520 /* we might need to revert back to that point */ 1521 data = *from; 1522 if (iocb->ki_flags & IOCB_DIRECT) { 1523 written = ceph_direct_read_write(iocb, &data, snapc, 1524 &prealloc_cf); 1525 ceph_end_io_direct(inode); 1526 } else { 1527 written = ceph_sync_write(iocb, &data, pos, snapc); 1528 ceph_end_io_write(inode); 1529 } 1530 if (written > 0) 1531 iov_iter_advance(from, written); 1532 ceph_put_snap_context(snapc); 1533 } else { 1534 /* 1535 * No need to acquire the i_truncate_mutex. Because 1536 * the MDS revokes Fwb caps before sending truncate 1537 * message to us. We can't get Fwb cap while there 1538 * are pending vmtruncate. So write and vmtruncate 1539 * can not run at the same time 1540 */ 1541 written = generic_perform_write(file, from, pos); 1542 if (likely(written >= 0)) 1543 iocb->ki_pos = pos + written; 1544 ceph_end_io_write(inode); 1545 } 1546 1547 if (written >= 0) { 1548 int dirty; 1549 1550 spin_lock(&ci->i_ceph_lock); 1551 ci->i_inline_version = CEPH_INLINE_NONE; 1552 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR, 1553 &prealloc_cf); 1554 spin_unlock(&ci->i_ceph_lock); 1555 if (dirty) 1556 __mark_inode_dirty(inode, dirty); 1557 if (ceph_quota_is_max_bytes_approaching(inode, iocb->ki_pos)) 1558 ceph_check_caps(ci, CHECK_CAPS_NODELAY, NULL); 1559 } 1560 1561 dout("aio_write %p %llx.%llx %llu~%u dropping cap refs on %s\n", 1562 inode, ceph_vinop(inode), pos, (unsigned)count, 1563 ceph_cap_string(got)); 1564 ceph_put_cap_refs(ci, got); 1565 1566 if (written == -EOLDSNAPC) { 1567 dout("aio_write %p %llx.%llx %llu~%u" "got EOLDSNAPC, retrying\n", 1568 inode, ceph_vinop(inode), pos, (unsigned)count); 1569 goto retry_snap; 1570 } 1571 1572 if (written >= 0) { 1573 if (ceph_osdmap_flag(&fsc->client->osdc, CEPH_OSDMAP_NEARFULL)) 1574 iocb->ki_flags |= IOCB_DSYNC; 1575 written = generic_write_sync(iocb, written); 1576 } 1577 1578 goto out_unlocked; 1579 out: 1580 if (iocb->ki_flags & IOCB_DIRECT) 1581 ceph_end_io_direct(inode); 1582 else 1583 ceph_end_io_write(inode); 1584 out_unlocked: 1585 ceph_free_cap_flush(prealloc_cf); 1586 current->backing_dev_info = NULL; 1587 return written ? written : err; 1588 } 1589 1590 /* 1591 * llseek. be sure to verify file size on SEEK_END. 1592 */ 1593 static loff_t ceph_llseek(struct file *file, loff_t offset, int whence) 1594 { 1595 struct inode *inode = file->f_mapping->host; 1596 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 1597 loff_t i_size; 1598 loff_t ret; 1599 1600 inode_lock(inode); 1601 1602 if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) { 1603 ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false); 1604 if (ret < 0) 1605 goto out; 1606 } 1607 1608 i_size = i_size_read(inode); 1609 switch (whence) { 1610 case SEEK_END: 1611 offset += i_size; 1612 break; 1613 case SEEK_CUR: 1614 /* 1615 * Here we special-case the lseek(fd, 0, SEEK_CUR) 1616 * position-querying operation. Avoid rewriting the "same" 1617 * f_pos value back to the file because a concurrent read(), 1618 * write() or lseek() might have altered it 1619 */ 1620 if (offset == 0) { 1621 ret = file->f_pos; 1622 goto out; 1623 } 1624 offset += file->f_pos; 1625 break; 1626 case SEEK_DATA: 1627 if (offset < 0 || offset >= i_size) { 1628 ret = -ENXIO; 1629 goto out; 1630 } 1631 break; 1632 case SEEK_HOLE: 1633 if (offset < 0 || offset >= i_size) { 1634 ret = -ENXIO; 1635 goto out; 1636 } 1637 offset = i_size; 1638 break; 1639 } 1640 1641 ret = vfs_setpos(file, offset, max(i_size, fsc->max_file_size)); 1642 1643 out: 1644 inode_unlock(inode); 1645 return ret; 1646 } 1647 1648 static inline void ceph_zero_partial_page( 1649 struct inode *inode, loff_t offset, unsigned size) 1650 { 1651 struct page *page; 1652 pgoff_t index = offset >> PAGE_SHIFT; 1653 1654 page = find_lock_page(inode->i_mapping, index); 1655 if (page) { 1656 wait_on_page_writeback(page); 1657 zero_user(page, offset & (PAGE_SIZE - 1), size); 1658 unlock_page(page); 1659 put_page(page); 1660 } 1661 } 1662 1663 static void ceph_zero_pagecache_range(struct inode *inode, loff_t offset, 1664 loff_t length) 1665 { 1666 loff_t nearly = round_up(offset, PAGE_SIZE); 1667 if (offset < nearly) { 1668 loff_t size = nearly - offset; 1669 if (length < size) 1670 size = length; 1671 ceph_zero_partial_page(inode, offset, size); 1672 offset += size; 1673 length -= size; 1674 } 1675 if (length >= PAGE_SIZE) { 1676 loff_t size = round_down(length, PAGE_SIZE); 1677 truncate_pagecache_range(inode, offset, offset + size - 1); 1678 offset += size; 1679 length -= size; 1680 } 1681 if (length) 1682 ceph_zero_partial_page(inode, offset, length); 1683 } 1684 1685 static int ceph_zero_partial_object(struct inode *inode, 1686 loff_t offset, loff_t *length) 1687 { 1688 struct ceph_inode_info *ci = ceph_inode(inode); 1689 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 1690 struct ceph_osd_request *req; 1691 int ret = 0; 1692 loff_t zero = 0; 1693 int op; 1694 1695 if (!length) { 1696 op = offset ? CEPH_OSD_OP_DELETE : CEPH_OSD_OP_TRUNCATE; 1697 length = &zero; 1698 } else { 1699 op = CEPH_OSD_OP_ZERO; 1700 } 1701 1702 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, 1703 ceph_vino(inode), 1704 offset, length, 1705 0, 1, op, 1706 CEPH_OSD_FLAG_WRITE, 1707 NULL, 0, 0, false); 1708 if (IS_ERR(req)) { 1709 ret = PTR_ERR(req); 1710 goto out; 1711 } 1712 1713 req->r_mtime = inode->i_mtime; 1714 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false); 1715 if (!ret) { 1716 ret = ceph_osdc_wait_request(&fsc->client->osdc, req); 1717 if (ret == -ENOENT) 1718 ret = 0; 1719 } 1720 ceph_osdc_put_request(req); 1721 1722 out: 1723 return ret; 1724 } 1725 1726 static int ceph_zero_objects(struct inode *inode, loff_t offset, loff_t length) 1727 { 1728 int ret = 0; 1729 struct ceph_inode_info *ci = ceph_inode(inode); 1730 s32 stripe_unit = ci->i_layout.stripe_unit; 1731 s32 stripe_count = ci->i_layout.stripe_count; 1732 s32 object_size = ci->i_layout.object_size; 1733 u64 object_set_size = object_size * stripe_count; 1734 u64 nearly, t; 1735 1736 /* round offset up to next period boundary */ 1737 nearly = offset + object_set_size - 1; 1738 t = nearly; 1739 nearly -= do_div(t, object_set_size); 1740 1741 while (length && offset < nearly) { 1742 loff_t size = length; 1743 ret = ceph_zero_partial_object(inode, offset, &size); 1744 if (ret < 0) 1745 return ret; 1746 offset += size; 1747 length -= size; 1748 } 1749 while (length >= object_set_size) { 1750 int i; 1751 loff_t pos = offset; 1752 for (i = 0; i < stripe_count; ++i) { 1753 ret = ceph_zero_partial_object(inode, pos, NULL); 1754 if (ret < 0) 1755 return ret; 1756 pos += stripe_unit; 1757 } 1758 offset += object_set_size; 1759 length -= object_set_size; 1760 } 1761 while (length) { 1762 loff_t size = length; 1763 ret = ceph_zero_partial_object(inode, offset, &size); 1764 if (ret < 0) 1765 return ret; 1766 offset += size; 1767 length -= size; 1768 } 1769 return ret; 1770 } 1771 1772 static long ceph_fallocate(struct file *file, int mode, 1773 loff_t offset, loff_t length) 1774 { 1775 struct ceph_file_info *fi = file->private_data; 1776 struct inode *inode = file_inode(file); 1777 struct ceph_inode_info *ci = ceph_inode(inode); 1778 struct ceph_cap_flush *prealloc_cf; 1779 int want, got = 0; 1780 int dirty; 1781 int ret = 0; 1782 loff_t endoff = 0; 1783 loff_t size; 1784 1785 if (mode != (FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE)) 1786 return -EOPNOTSUPP; 1787 1788 if (!S_ISREG(inode->i_mode)) 1789 return -EOPNOTSUPP; 1790 1791 prealloc_cf = ceph_alloc_cap_flush(); 1792 if (!prealloc_cf) 1793 return -ENOMEM; 1794 1795 inode_lock(inode); 1796 1797 if (ceph_snap(inode) != CEPH_NOSNAP) { 1798 ret = -EROFS; 1799 goto unlock; 1800 } 1801 1802 if (ci->i_inline_version != CEPH_INLINE_NONE) { 1803 ret = ceph_uninline_data(file, NULL); 1804 if (ret < 0) 1805 goto unlock; 1806 } 1807 1808 size = i_size_read(inode); 1809 1810 /* Are we punching a hole beyond EOF? */ 1811 if (offset >= size) 1812 goto unlock; 1813 if ((offset + length) > size) 1814 length = size - offset; 1815 1816 if (fi->fmode & CEPH_FILE_MODE_LAZY) 1817 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; 1818 else 1819 want = CEPH_CAP_FILE_BUFFER; 1820 1821 ret = ceph_get_caps(file, CEPH_CAP_FILE_WR, want, endoff, &got, NULL); 1822 if (ret < 0) 1823 goto unlock; 1824 1825 ceph_zero_pagecache_range(inode, offset, length); 1826 ret = ceph_zero_objects(inode, offset, length); 1827 1828 if (!ret) { 1829 spin_lock(&ci->i_ceph_lock); 1830 ci->i_inline_version = CEPH_INLINE_NONE; 1831 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR, 1832 &prealloc_cf); 1833 spin_unlock(&ci->i_ceph_lock); 1834 if (dirty) 1835 __mark_inode_dirty(inode, dirty); 1836 } 1837 1838 ceph_put_cap_refs(ci, got); 1839 unlock: 1840 inode_unlock(inode); 1841 ceph_free_cap_flush(prealloc_cf); 1842 return ret; 1843 } 1844 1845 /* 1846 * This function tries to get FILE_WR capabilities for dst_ci and FILE_RD for 1847 * src_ci. Two attempts are made to obtain both caps, and an error is return if 1848 * this fails; zero is returned on success. 1849 */ 1850 static int get_rd_wr_caps(struct file *src_filp, int *src_got, 1851 struct file *dst_filp, 1852 loff_t dst_endoff, int *dst_got) 1853 { 1854 int ret = 0; 1855 bool retrying = false; 1856 1857 retry_caps: 1858 ret = ceph_get_caps(dst_filp, CEPH_CAP_FILE_WR, CEPH_CAP_FILE_BUFFER, 1859 dst_endoff, dst_got, NULL); 1860 if (ret < 0) 1861 return ret; 1862 1863 /* 1864 * Since we're already holding the FILE_WR capability for the dst file, 1865 * we would risk a deadlock by using ceph_get_caps. Thus, we'll do some 1866 * retry dance instead to try to get both capabilities. 1867 */ 1868 ret = ceph_try_get_caps(file_inode(src_filp), 1869 CEPH_CAP_FILE_RD, CEPH_CAP_FILE_SHARED, 1870 false, src_got); 1871 if (ret <= 0) { 1872 /* Start by dropping dst_ci caps and getting src_ci caps */ 1873 ceph_put_cap_refs(ceph_inode(file_inode(dst_filp)), *dst_got); 1874 if (retrying) { 1875 if (!ret) 1876 /* ceph_try_get_caps masks EAGAIN */ 1877 ret = -EAGAIN; 1878 return ret; 1879 } 1880 ret = ceph_get_caps(src_filp, CEPH_CAP_FILE_RD, 1881 CEPH_CAP_FILE_SHARED, -1, src_got, NULL); 1882 if (ret < 0) 1883 return ret; 1884 /*... drop src_ci caps too, and retry */ 1885 ceph_put_cap_refs(ceph_inode(file_inode(src_filp)), *src_got); 1886 retrying = true; 1887 goto retry_caps; 1888 } 1889 return ret; 1890 } 1891 1892 static void put_rd_wr_caps(struct ceph_inode_info *src_ci, int src_got, 1893 struct ceph_inode_info *dst_ci, int dst_got) 1894 { 1895 ceph_put_cap_refs(src_ci, src_got); 1896 ceph_put_cap_refs(dst_ci, dst_got); 1897 } 1898 1899 /* 1900 * This function does several size-related checks, returning an error if: 1901 * - source file is smaller than off+len 1902 * - destination file size is not OK (inode_newsize_ok()) 1903 * - max bytes quotas is exceeded 1904 */ 1905 static int is_file_size_ok(struct inode *src_inode, struct inode *dst_inode, 1906 loff_t src_off, loff_t dst_off, size_t len) 1907 { 1908 loff_t size, endoff; 1909 1910 size = i_size_read(src_inode); 1911 /* 1912 * Don't copy beyond source file EOF. Instead of simply setting length 1913 * to (size - src_off), just drop to VFS default implementation, as the 1914 * local i_size may be stale due to other clients writing to the source 1915 * inode. 1916 */ 1917 if (src_off + len > size) { 1918 dout("Copy beyond EOF (%llu + %zu > %llu)\n", 1919 src_off, len, size); 1920 return -EOPNOTSUPP; 1921 } 1922 size = i_size_read(dst_inode); 1923 1924 endoff = dst_off + len; 1925 if (inode_newsize_ok(dst_inode, endoff)) 1926 return -EOPNOTSUPP; 1927 1928 if (ceph_quota_is_max_bytes_exceeded(dst_inode, endoff)) 1929 return -EDQUOT; 1930 1931 return 0; 1932 } 1933 1934 static ssize_t __ceph_copy_file_range(struct file *src_file, loff_t src_off, 1935 struct file *dst_file, loff_t dst_off, 1936 size_t len, unsigned int flags) 1937 { 1938 struct inode *src_inode = file_inode(src_file); 1939 struct inode *dst_inode = file_inode(dst_file); 1940 struct ceph_inode_info *src_ci = ceph_inode(src_inode); 1941 struct ceph_inode_info *dst_ci = ceph_inode(dst_inode); 1942 struct ceph_cap_flush *prealloc_cf; 1943 struct ceph_fs_client *src_fsc = ceph_inode_to_client(src_inode); 1944 struct ceph_object_locator src_oloc, dst_oloc; 1945 struct ceph_object_id src_oid, dst_oid; 1946 loff_t endoff = 0, size; 1947 ssize_t ret = -EIO; 1948 u64 src_objnum, dst_objnum, src_objoff, dst_objoff; 1949 u32 src_objlen, dst_objlen, object_size; 1950 int src_got = 0, dst_got = 0, err, dirty; 1951 bool do_final_copy = false; 1952 1953 if (src_inode->i_sb != dst_inode->i_sb) { 1954 struct ceph_fs_client *dst_fsc = ceph_inode_to_client(dst_inode); 1955 1956 if (ceph_fsid_compare(&src_fsc->client->fsid, 1957 &dst_fsc->client->fsid)) { 1958 dout("Copying files across clusters: src: %pU dst: %pU\n", 1959 &src_fsc->client->fsid, &dst_fsc->client->fsid); 1960 return -EXDEV; 1961 } 1962 } 1963 if (ceph_snap(dst_inode) != CEPH_NOSNAP) 1964 return -EROFS; 1965 1966 /* 1967 * Some of the checks below will return -EOPNOTSUPP, which will force a 1968 * fallback to the default VFS copy_file_range implementation. This is 1969 * desirable in several cases (for ex, the 'len' is smaller than the 1970 * size of the objects, or in cases where that would be more 1971 * efficient). 1972 */ 1973 1974 if (ceph_test_mount_opt(src_fsc, NOCOPYFROM)) 1975 return -EOPNOTSUPP; 1976 1977 /* 1978 * Striped file layouts require that we copy partial objects, but the 1979 * OSD copy-from operation only supports full-object copies. Limit 1980 * this to non-striped file layouts for now. 1981 */ 1982 if ((src_ci->i_layout.stripe_unit != dst_ci->i_layout.stripe_unit) || 1983 (src_ci->i_layout.stripe_count != 1) || 1984 (dst_ci->i_layout.stripe_count != 1) || 1985 (src_ci->i_layout.object_size != dst_ci->i_layout.object_size)) { 1986 dout("Invalid src/dst files layout\n"); 1987 return -EOPNOTSUPP; 1988 } 1989 1990 if (len < src_ci->i_layout.object_size) 1991 return -EOPNOTSUPP; /* no remote copy will be done */ 1992 1993 prealloc_cf = ceph_alloc_cap_flush(); 1994 if (!prealloc_cf) 1995 return -ENOMEM; 1996 1997 /* Start by sync'ing the source and destination files */ 1998 ret = file_write_and_wait_range(src_file, src_off, (src_off + len)); 1999 if (ret < 0) { 2000 dout("failed to write src file (%zd)\n", ret); 2001 goto out; 2002 } 2003 ret = file_write_and_wait_range(dst_file, dst_off, (dst_off + len)); 2004 if (ret < 0) { 2005 dout("failed to write dst file (%zd)\n", ret); 2006 goto out; 2007 } 2008 2009 /* 2010 * We need FILE_WR caps for dst_ci and FILE_RD for src_ci as other 2011 * clients may have dirty data in their caches. And OSDs know nothing 2012 * about caps, so they can't safely do the remote object copies. 2013 */ 2014 err = get_rd_wr_caps(src_file, &src_got, 2015 dst_file, (dst_off + len), &dst_got); 2016 if (err < 0) { 2017 dout("get_rd_wr_caps returned %d\n", err); 2018 ret = -EOPNOTSUPP; 2019 goto out; 2020 } 2021 2022 ret = is_file_size_ok(src_inode, dst_inode, src_off, dst_off, len); 2023 if (ret < 0) 2024 goto out_caps; 2025 2026 size = i_size_read(dst_inode); 2027 endoff = dst_off + len; 2028 2029 /* Drop dst file cached pages */ 2030 ret = invalidate_inode_pages2_range(dst_inode->i_mapping, 2031 dst_off >> PAGE_SHIFT, 2032 endoff >> PAGE_SHIFT); 2033 if (ret < 0) { 2034 dout("Failed to invalidate inode pages (%zd)\n", ret); 2035 ret = 0; /* XXX */ 2036 } 2037 src_oloc.pool = src_ci->i_layout.pool_id; 2038 src_oloc.pool_ns = ceph_try_get_string(src_ci->i_layout.pool_ns); 2039 dst_oloc.pool = dst_ci->i_layout.pool_id; 2040 dst_oloc.pool_ns = ceph_try_get_string(dst_ci->i_layout.pool_ns); 2041 2042 ceph_calc_file_object_mapping(&src_ci->i_layout, src_off, 2043 src_ci->i_layout.object_size, 2044 &src_objnum, &src_objoff, &src_objlen); 2045 ceph_calc_file_object_mapping(&dst_ci->i_layout, dst_off, 2046 dst_ci->i_layout.object_size, 2047 &dst_objnum, &dst_objoff, &dst_objlen); 2048 /* object-level offsets need to the same */ 2049 if (src_objoff != dst_objoff) { 2050 ret = -EOPNOTSUPP; 2051 goto out_caps; 2052 } 2053 2054 /* 2055 * Do a manual copy if the object offset isn't object aligned. 2056 * 'src_objlen' contains the bytes left until the end of the object, 2057 * starting at the src_off 2058 */ 2059 if (src_objoff) { 2060 /* 2061 * we need to temporarily drop all caps as we'll be calling 2062 * {read,write}_iter, which will get caps again. 2063 */ 2064 put_rd_wr_caps(src_ci, src_got, dst_ci, dst_got); 2065 ret = do_splice_direct(src_file, &src_off, dst_file, 2066 &dst_off, src_objlen, flags); 2067 if (ret < 0) { 2068 dout("do_splice_direct returned %d\n", err); 2069 goto out; 2070 } 2071 len -= ret; 2072 err = get_rd_wr_caps(src_file, &src_got, 2073 dst_file, (dst_off + len), &dst_got); 2074 if (err < 0) 2075 goto out; 2076 err = is_file_size_ok(src_inode, dst_inode, 2077 src_off, dst_off, len); 2078 if (err < 0) 2079 goto out_caps; 2080 } 2081 object_size = src_ci->i_layout.object_size; 2082 while (len >= object_size) { 2083 ceph_calc_file_object_mapping(&src_ci->i_layout, src_off, 2084 object_size, &src_objnum, 2085 &src_objoff, &src_objlen); 2086 ceph_calc_file_object_mapping(&dst_ci->i_layout, dst_off, 2087 object_size, &dst_objnum, 2088 &dst_objoff, &dst_objlen); 2089 ceph_oid_init(&src_oid); 2090 ceph_oid_printf(&src_oid, "%llx.%08llx", 2091 src_ci->i_vino.ino, src_objnum); 2092 ceph_oid_init(&dst_oid); 2093 ceph_oid_printf(&dst_oid, "%llx.%08llx", 2094 dst_ci->i_vino.ino, dst_objnum); 2095 /* Do an object remote copy */ 2096 err = ceph_osdc_copy_from( 2097 &src_fsc->client->osdc, 2098 src_ci->i_vino.snap, 0, 2099 &src_oid, &src_oloc, 2100 CEPH_OSD_OP_FLAG_FADVISE_SEQUENTIAL | 2101 CEPH_OSD_OP_FLAG_FADVISE_NOCACHE, 2102 &dst_oid, &dst_oloc, 2103 CEPH_OSD_OP_FLAG_FADVISE_SEQUENTIAL | 2104 CEPH_OSD_OP_FLAG_FADVISE_DONTNEED, 0); 2105 if (err) { 2106 dout("ceph_osdc_copy_from returned %d\n", err); 2107 if (!ret) 2108 ret = err; 2109 goto out_caps; 2110 } 2111 len -= object_size; 2112 src_off += object_size; 2113 dst_off += object_size; 2114 ret += object_size; 2115 } 2116 2117 if (len) 2118 /* We still need one final local copy */ 2119 do_final_copy = true; 2120 2121 file_update_time(dst_file); 2122 inode_inc_iversion_raw(dst_inode); 2123 2124 if (endoff > size) { 2125 int caps_flags = 0; 2126 2127 /* Let the MDS know about dst file size change */ 2128 if (ceph_quota_is_max_bytes_approaching(dst_inode, endoff)) 2129 caps_flags |= CHECK_CAPS_NODELAY; 2130 if (ceph_inode_set_size(dst_inode, endoff)) 2131 caps_flags |= CHECK_CAPS_AUTHONLY; 2132 if (caps_flags) 2133 ceph_check_caps(dst_ci, caps_flags, NULL); 2134 } 2135 /* Mark Fw dirty */ 2136 spin_lock(&dst_ci->i_ceph_lock); 2137 dst_ci->i_inline_version = CEPH_INLINE_NONE; 2138 dirty = __ceph_mark_dirty_caps(dst_ci, CEPH_CAP_FILE_WR, &prealloc_cf); 2139 spin_unlock(&dst_ci->i_ceph_lock); 2140 if (dirty) 2141 __mark_inode_dirty(dst_inode, dirty); 2142 2143 out_caps: 2144 put_rd_wr_caps(src_ci, src_got, dst_ci, dst_got); 2145 2146 if (do_final_copy) { 2147 err = do_splice_direct(src_file, &src_off, dst_file, 2148 &dst_off, len, flags); 2149 if (err < 0) { 2150 dout("do_splice_direct returned %d\n", err); 2151 goto out; 2152 } 2153 len -= err; 2154 ret += err; 2155 } 2156 2157 out: 2158 ceph_free_cap_flush(prealloc_cf); 2159 2160 return ret; 2161 } 2162 2163 static ssize_t ceph_copy_file_range(struct file *src_file, loff_t src_off, 2164 struct file *dst_file, loff_t dst_off, 2165 size_t len, unsigned int flags) 2166 { 2167 ssize_t ret; 2168 2169 ret = __ceph_copy_file_range(src_file, src_off, dst_file, dst_off, 2170 len, flags); 2171 2172 if (ret == -EOPNOTSUPP || ret == -EXDEV) 2173 ret = generic_copy_file_range(src_file, src_off, dst_file, 2174 dst_off, len, flags); 2175 return ret; 2176 } 2177 2178 const struct file_operations ceph_file_fops = { 2179 .open = ceph_open, 2180 .release = ceph_release, 2181 .llseek = ceph_llseek, 2182 .read_iter = ceph_read_iter, 2183 .write_iter = ceph_write_iter, 2184 .mmap = ceph_mmap, 2185 .fsync = ceph_fsync, 2186 .lock = ceph_lock, 2187 .flock = ceph_flock, 2188 .splice_read = generic_file_splice_read, 2189 .splice_write = iter_file_splice_write, 2190 .unlocked_ioctl = ceph_ioctl, 2191 .compat_ioctl = compat_ptr_ioctl, 2192 .fallocate = ceph_fallocate, 2193 .copy_file_range = ceph_copy_file_range, 2194 }; 2195