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 ret = aio_req->error; 757 if (!ret) 758 ret = aio_req->total_len; 759 760 dout("ceph_aio_complete %p rc %d\n", inode, ret); 761 762 if (ret >= 0 && aio_req->write) { 763 int dirty; 764 765 loff_t endoff = aio_req->iocb->ki_pos + aio_req->total_len; 766 if (endoff > i_size_read(inode)) { 767 if (ceph_inode_set_size(inode, endoff)) 768 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL); 769 } 770 771 spin_lock(&ci->i_ceph_lock); 772 ci->i_inline_version = CEPH_INLINE_NONE; 773 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR, 774 &aio_req->prealloc_cf); 775 spin_unlock(&ci->i_ceph_lock); 776 if (dirty) 777 __mark_inode_dirty(inode, dirty); 778 779 } 780 781 ceph_put_cap_refs(ci, (aio_req->write ? CEPH_CAP_FILE_WR : 782 CEPH_CAP_FILE_RD)); 783 784 aio_req->iocb->ki_complete(aio_req->iocb, ret, 0); 785 786 ceph_free_cap_flush(aio_req->prealloc_cf); 787 kfree(aio_req); 788 } 789 790 static void ceph_aio_complete_req(struct ceph_osd_request *req) 791 { 792 int rc = req->r_result; 793 struct inode *inode = req->r_inode; 794 struct ceph_aio_request *aio_req = req->r_priv; 795 struct ceph_osd_data *osd_data = osd_req_op_extent_osd_data(req, 0); 796 797 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_BVECS); 798 BUG_ON(!osd_data->num_bvecs); 799 800 dout("ceph_aio_complete_req %p rc %d bytes %u\n", 801 inode, rc, osd_data->bvec_pos.iter.bi_size); 802 803 if (rc == -EOLDSNAPC) { 804 struct ceph_aio_work *aio_work; 805 BUG_ON(!aio_req->write); 806 807 aio_work = kmalloc(sizeof(*aio_work), GFP_NOFS); 808 if (aio_work) { 809 INIT_WORK(&aio_work->work, ceph_aio_retry_work); 810 aio_work->req = req; 811 queue_work(ceph_inode_to_client(inode)->inode_wq, 812 &aio_work->work); 813 return; 814 } 815 rc = -ENOMEM; 816 } else if (!aio_req->write) { 817 if (rc == -ENOENT) 818 rc = 0; 819 if (rc >= 0 && osd_data->bvec_pos.iter.bi_size > rc) { 820 struct iov_iter i; 821 int zlen = osd_data->bvec_pos.iter.bi_size - rc; 822 823 /* 824 * If read is satisfied by single OSD request, 825 * it can pass EOF. Otherwise read is within 826 * i_size. 827 */ 828 if (aio_req->num_reqs == 1) { 829 loff_t i_size = i_size_read(inode); 830 loff_t endoff = aio_req->iocb->ki_pos + rc; 831 if (endoff < i_size) 832 zlen = min_t(size_t, zlen, 833 i_size - endoff); 834 aio_req->total_len = rc + zlen; 835 } 836 837 iov_iter_bvec(&i, READ, osd_data->bvec_pos.bvecs, 838 osd_data->num_bvecs, 839 osd_data->bvec_pos.iter.bi_size); 840 iov_iter_advance(&i, rc); 841 iov_iter_zero(zlen, &i); 842 } 843 } 844 845 put_bvecs(osd_data->bvec_pos.bvecs, osd_data->num_bvecs, 846 aio_req->should_dirty); 847 ceph_osdc_put_request(req); 848 849 if (rc < 0) 850 cmpxchg(&aio_req->error, 0, rc); 851 852 ceph_aio_complete(inode, aio_req); 853 return; 854 } 855 856 static void ceph_aio_retry_work(struct work_struct *work) 857 { 858 struct ceph_aio_work *aio_work = 859 container_of(work, struct ceph_aio_work, work); 860 struct ceph_osd_request *orig_req = aio_work->req; 861 struct ceph_aio_request *aio_req = orig_req->r_priv; 862 struct inode *inode = orig_req->r_inode; 863 struct ceph_inode_info *ci = ceph_inode(inode); 864 struct ceph_snap_context *snapc; 865 struct ceph_osd_request *req; 866 int ret; 867 868 spin_lock(&ci->i_ceph_lock); 869 if (__ceph_have_pending_cap_snap(ci)) { 870 struct ceph_cap_snap *capsnap = 871 list_last_entry(&ci->i_cap_snaps, 872 struct ceph_cap_snap, 873 ci_item); 874 snapc = ceph_get_snap_context(capsnap->context); 875 } else { 876 BUG_ON(!ci->i_head_snapc); 877 snapc = ceph_get_snap_context(ci->i_head_snapc); 878 } 879 spin_unlock(&ci->i_ceph_lock); 880 881 req = ceph_osdc_alloc_request(orig_req->r_osdc, snapc, 1, 882 false, GFP_NOFS); 883 if (!req) { 884 ret = -ENOMEM; 885 req = orig_req; 886 goto out; 887 } 888 889 req->r_flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE; 890 ceph_oloc_copy(&req->r_base_oloc, &orig_req->r_base_oloc); 891 ceph_oid_copy(&req->r_base_oid, &orig_req->r_base_oid); 892 893 req->r_ops[0] = orig_req->r_ops[0]; 894 895 req->r_mtime = aio_req->mtime; 896 req->r_data_offset = req->r_ops[0].extent.offset; 897 898 ret = ceph_osdc_alloc_messages(req, GFP_NOFS); 899 if (ret) { 900 ceph_osdc_put_request(req); 901 req = orig_req; 902 goto out; 903 } 904 905 ceph_osdc_put_request(orig_req); 906 907 req->r_callback = ceph_aio_complete_req; 908 req->r_inode = inode; 909 req->r_priv = aio_req; 910 911 ret = ceph_osdc_start_request(req->r_osdc, req, false); 912 out: 913 if (ret < 0) { 914 req->r_result = ret; 915 ceph_aio_complete_req(req); 916 } 917 918 ceph_put_snap_context(snapc); 919 kfree(aio_work); 920 } 921 922 static ssize_t 923 ceph_direct_read_write(struct kiocb *iocb, struct iov_iter *iter, 924 struct ceph_snap_context *snapc, 925 struct ceph_cap_flush **pcf) 926 { 927 struct file *file = iocb->ki_filp; 928 struct inode *inode = file_inode(file); 929 struct ceph_inode_info *ci = ceph_inode(inode); 930 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 931 struct ceph_vino vino; 932 struct ceph_osd_request *req; 933 struct bio_vec *bvecs; 934 struct ceph_aio_request *aio_req = NULL; 935 int num_pages = 0; 936 int flags; 937 int ret = 0; 938 struct timespec64 mtime = current_time(inode); 939 size_t count = iov_iter_count(iter); 940 loff_t pos = iocb->ki_pos; 941 bool write = iov_iter_rw(iter) == WRITE; 942 bool should_dirty = !write && iter_is_iovec(iter); 943 944 if (write && ceph_snap(file_inode(file)) != CEPH_NOSNAP) 945 return -EROFS; 946 947 dout("sync_direct_%s on file %p %lld~%u snapc %p seq %lld\n", 948 (write ? "write" : "read"), file, pos, (unsigned)count, 949 snapc, snapc ? snapc->seq : 0); 950 951 if (write) { 952 int ret2 = invalidate_inode_pages2_range(inode->i_mapping, 953 pos >> PAGE_SHIFT, 954 (pos + count - 1) >> PAGE_SHIFT); 955 if (ret2 < 0) 956 dout("invalidate_inode_pages2_range returned %d\n", ret2); 957 958 flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE; 959 } else { 960 flags = CEPH_OSD_FLAG_READ; 961 } 962 963 while (iov_iter_count(iter) > 0) { 964 u64 size = iov_iter_count(iter); 965 ssize_t len; 966 967 if (write) 968 size = min_t(u64, size, fsc->mount_options->wsize); 969 else 970 size = min_t(u64, size, fsc->mount_options->rsize); 971 972 vino = ceph_vino(inode); 973 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, 974 vino, pos, &size, 0, 975 1, 976 write ? CEPH_OSD_OP_WRITE : 977 CEPH_OSD_OP_READ, 978 flags, snapc, 979 ci->i_truncate_seq, 980 ci->i_truncate_size, 981 false); 982 if (IS_ERR(req)) { 983 ret = PTR_ERR(req); 984 break; 985 } 986 987 len = iter_get_bvecs_alloc(iter, size, &bvecs, &num_pages); 988 if (len < 0) { 989 ceph_osdc_put_request(req); 990 ret = len; 991 break; 992 } 993 if (len != size) 994 osd_req_op_extent_update(req, 0, len); 995 996 /* 997 * To simplify error handling, allow AIO when IO within i_size 998 * or IO can be satisfied by single OSD request. 999 */ 1000 if (pos == iocb->ki_pos && !is_sync_kiocb(iocb) && 1001 (len == count || pos + count <= i_size_read(inode))) { 1002 aio_req = kzalloc(sizeof(*aio_req), GFP_KERNEL); 1003 if (aio_req) { 1004 aio_req->iocb = iocb; 1005 aio_req->write = write; 1006 aio_req->should_dirty = should_dirty; 1007 INIT_LIST_HEAD(&aio_req->osd_reqs); 1008 if (write) { 1009 aio_req->mtime = mtime; 1010 swap(aio_req->prealloc_cf, *pcf); 1011 } 1012 } 1013 /* ignore error */ 1014 } 1015 1016 if (write) { 1017 /* 1018 * throw out any page cache pages in this range. this 1019 * may block. 1020 */ 1021 truncate_inode_pages_range(inode->i_mapping, pos, 1022 PAGE_ALIGN(pos + len) - 1); 1023 1024 req->r_mtime = mtime; 1025 } 1026 1027 osd_req_op_extent_osd_data_bvecs(req, 0, bvecs, num_pages, len); 1028 1029 if (aio_req) { 1030 aio_req->total_len += len; 1031 aio_req->num_reqs++; 1032 atomic_inc(&aio_req->pending_reqs); 1033 1034 req->r_callback = ceph_aio_complete_req; 1035 req->r_inode = inode; 1036 req->r_priv = aio_req; 1037 list_add_tail(&req->r_private_item, &aio_req->osd_reqs); 1038 1039 pos += len; 1040 continue; 1041 } 1042 1043 ret = ceph_osdc_start_request(req->r_osdc, req, false); 1044 if (!ret) 1045 ret = ceph_osdc_wait_request(&fsc->client->osdc, req); 1046 1047 size = i_size_read(inode); 1048 if (!write) { 1049 if (ret == -ENOENT) 1050 ret = 0; 1051 if (ret >= 0 && ret < len && pos + ret < size) { 1052 struct iov_iter i; 1053 int zlen = min_t(size_t, len - ret, 1054 size - pos - ret); 1055 1056 iov_iter_bvec(&i, READ, bvecs, num_pages, len); 1057 iov_iter_advance(&i, ret); 1058 iov_iter_zero(zlen, &i); 1059 ret += zlen; 1060 } 1061 if (ret >= 0) 1062 len = ret; 1063 } 1064 1065 put_bvecs(bvecs, num_pages, should_dirty); 1066 ceph_osdc_put_request(req); 1067 if (ret < 0) 1068 break; 1069 1070 pos += len; 1071 if (!write && pos >= size) 1072 break; 1073 1074 if (write && pos > size) { 1075 if (ceph_inode_set_size(inode, pos)) 1076 ceph_check_caps(ceph_inode(inode), 1077 CHECK_CAPS_AUTHONLY, 1078 NULL); 1079 } 1080 } 1081 1082 if (aio_req) { 1083 LIST_HEAD(osd_reqs); 1084 1085 if (aio_req->num_reqs == 0) { 1086 kfree(aio_req); 1087 return ret; 1088 } 1089 1090 ceph_get_cap_refs(ci, write ? CEPH_CAP_FILE_WR : 1091 CEPH_CAP_FILE_RD); 1092 1093 list_splice(&aio_req->osd_reqs, &osd_reqs); 1094 while (!list_empty(&osd_reqs)) { 1095 req = list_first_entry(&osd_reqs, 1096 struct ceph_osd_request, 1097 r_private_item); 1098 list_del_init(&req->r_private_item); 1099 if (ret >= 0) 1100 ret = ceph_osdc_start_request(req->r_osdc, 1101 req, false); 1102 if (ret < 0) { 1103 req->r_result = ret; 1104 ceph_aio_complete_req(req); 1105 } 1106 } 1107 return -EIOCBQUEUED; 1108 } 1109 1110 if (ret != -EOLDSNAPC && pos > iocb->ki_pos) { 1111 ret = pos - iocb->ki_pos; 1112 iocb->ki_pos = pos; 1113 } 1114 return ret; 1115 } 1116 1117 /* 1118 * Synchronous write, straight from __user pointer or user pages. 1119 * 1120 * If write spans object boundary, just do multiple writes. (For a 1121 * correct atomic write, we should e.g. take write locks on all 1122 * objects, rollback on failure, etc.) 1123 */ 1124 static ssize_t 1125 ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos, 1126 struct ceph_snap_context *snapc) 1127 { 1128 struct file *file = iocb->ki_filp; 1129 struct inode *inode = file_inode(file); 1130 struct ceph_inode_info *ci = ceph_inode(inode); 1131 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 1132 struct ceph_vino vino; 1133 struct ceph_osd_request *req; 1134 struct page **pages; 1135 u64 len; 1136 int num_pages; 1137 int written = 0; 1138 int flags; 1139 int ret; 1140 bool check_caps = false; 1141 struct timespec64 mtime = current_time(inode); 1142 size_t count = iov_iter_count(from); 1143 1144 if (ceph_snap(file_inode(file)) != CEPH_NOSNAP) 1145 return -EROFS; 1146 1147 dout("sync_write on file %p %lld~%u snapc %p seq %lld\n", 1148 file, pos, (unsigned)count, snapc, snapc->seq); 1149 1150 ret = filemap_write_and_wait_range(inode->i_mapping, 1151 pos, pos + count - 1); 1152 if (ret < 0) 1153 return ret; 1154 1155 ret = invalidate_inode_pages2_range(inode->i_mapping, 1156 pos >> PAGE_SHIFT, 1157 (pos + count - 1) >> PAGE_SHIFT); 1158 if (ret < 0) 1159 dout("invalidate_inode_pages2_range returned %d\n", ret); 1160 1161 flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE; 1162 1163 while ((len = iov_iter_count(from)) > 0) { 1164 size_t left; 1165 int n; 1166 1167 vino = ceph_vino(inode); 1168 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, 1169 vino, pos, &len, 0, 1, 1170 CEPH_OSD_OP_WRITE, flags, snapc, 1171 ci->i_truncate_seq, 1172 ci->i_truncate_size, 1173 false); 1174 if (IS_ERR(req)) { 1175 ret = PTR_ERR(req); 1176 break; 1177 } 1178 1179 /* 1180 * write from beginning of first page, 1181 * regardless of io alignment 1182 */ 1183 num_pages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; 1184 1185 pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL); 1186 if (IS_ERR(pages)) { 1187 ret = PTR_ERR(pages); 1188 goto out; 1189 } 1190 1191 left = len; 1192 for (n = 0; n < num_pages; n++) { 1193 size_t plen = min_t(size_t, left, PAGE_SIZE); 1194 ret = copy_page_from_iter(pages[n], 0, plen, from); 1195 if (ret != plen) { 1196 ret = -EFAULT; 1197 break; 1198 } 1199 left -= ret; 1200 } 1201 1202 if (ret < 0) { 1203 ceph_release_page_vector(pages, num_pages); 1204 goto out; 1205 } 1206 1207 req->r_inode = inode; 1208 1209 osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, 1210 false, true); 1211 1212 req->r_mtime = mtime; 1213 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false); 1214 if (!ret) 1215 ret = ceph_osdc_wait_request(&fsc->client->osdc, req); 1216 1217 out: 1218 ceph_osdc_put_request(req); 1219 if (ret != 0) { 1220 ceph_set_error_write(ci); 1221 break; 1222 } 1223 1224 ceph_clear_error_write(ci); 1225 pos += len; 1226 written += len; 1227 if (pos > i_size_read(inode)) { 1228 check_caps = ceph_inode_set_size(inode, pos); 1229 if (check_caps) 1230 ceph_check_caps(ceph_inode(inode), 1231 CHECK_CAPS_AUTHONLY, 1232 NULL); 1233 } 1234 1235 } 1236 1237 if (ret != -EOLDSNAPC && written > 0) { 1238 ret = written; 1239 iocb->ki_pos = pos; 1240 } 1241 return ret; 1242 } 1243 1244 /* 1245 * Wrap generic_file_aio_read with checks for cap bits on the inode. 1246 * Atomically grab references, so that those bits are not released 1247 * back to the MDS mid-read. 1248 * 1249 * Hmm, the sync read case isn't actually async... should it be? 1250 */ 1251 static ssize_t ceph_read_iter(struct kiocb *iocb, struct iov_iter *to) 1252 { 1253 struct file *filp = iocb->ki_filp; 1254 struct ceph_file_info *fi = filp->private_data; 1255 size_t len = iov_iter_count(to); 1256 struct inode *inode = file_inode(filp); 1257 struct ceph_inode_info *ci = ceph_inode(inode); 1258 struct page *pinned_page = NULL; 1259 ssize_t ret; 1260 int want, got = 0; 1261 int retry_op = 0, read = 0; 1262 1263 again: 1264 dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n", 1265 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, inode); 1266 1267 if (fi->fmode & CEPH_FILE_MODE_LAZY) 1268 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO; 1269 else 1270 want = CEPH_CAP_FILE_CACHE; 1271 ret = ceph_get_caps(filp, CEPH_CAP_FILE_RD, want, -1, 1272 &got, &pinned_page); 1273 if (ret < 0) 1274 return ret; 1275 1276 if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 || 1277 (iocb->ki_flags & IOCB_DIRECT) || 1278 (fi->flags & CEPH_F_SYNC)) { 1279 1280 dout("aio_sync_read %p %llx.%llx %llu~%u got cap refs on %s\n", 1281 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, 1282 ceph_cap_string(got)); 1283 1284 if (ci->i_inline_version == CEPH_INLINE_NONE) { 1285 if (!retry_op && (iocb->ki_flags & IOCB_DIRECT)) { 1286 ceph_start_io_direct(inode); 1287 ret = ceph_direct_read_write(iocb, to, 1288 NULL, NULL); 1289 ceph_end_io_direct(inode); 1290 if (ret >= 0 && ret < len) 1291 retry_op = CHECK_EOF; 1292 } else { 1293 ceph_start_io_read(inode); 1294 ret = ceph_sync_read(iocb, to, &retry_op); 1295 ceph_end_io_read(inode); 1296 } 1297 } else { 1298 retry_op = READ_INLINE; 1299 } 1300 } else { 1301 CEPH_DEFINE_RW_CONTEXT(rw_ctx, got); 1302 dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n", 1303 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, 1304 ceph_cap_string(got)); 1305 ceph_add_rw_context(fi, &rw_ctx); 1306 ceph_start_io_read(inode); 1307 ret = generic_file_read_iter(iocb, to); 1308 ceph_end_io_read(inode); 1309 ceph_del_rw_context(fi, &rw_ctx); 1310 } 1311 dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n", 1312 inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret); 1313 if (pinned_page) { 1314 put_page(pinned_page); 1315 pinned_page = NULL; 1316 } 1317 ceph_put_cap_refs(ci, got); 1318 if (retry_op > HAVE_RETRIED && ret >= 0) { 1319 int statret; 1320 struct page *page = NULL; 1321 loff_t i_size; 1322 if (retry_op == READ_INLINE) { 1323 page = __page_cache_alloc(GFP_KERNEL); 1324 if (!page) 1325 return -ENOMEM; 1326 } 1327 1328 statret = __ceph_do_getattr(inode, page, 1329 CEPH_STAT_CAP_INLINE_DATA, !!page); 1330 if (statret < 0) { 1331 if (page) 1332 __free_page(page); 1333 if (statret == -ENODATA) { 1334 BUG_ON(retry_op != READ_INLINE); 1335 goto again; 1336 } 1337 return statret; 1338 } 1339 1340 i_size = i_size_read(inode); 1341 if (retry_op == READ_INLINE) { 1342 BUG_ON(ret > 0 || read > 0); 1343 if (iocb->ki_pos < i_size && 1344 iocb->ki_pos < PAGE_SIZE) { 1345 loff_t end = min_t(loff_t, i_size, 1346 iocb->ki_pos + len); 1347 end = min_t(loff_t, end, PAGE_SIZE); 1348 if (statret < end) 1349 zero_user_segment(page, statret, end); 1350 ret = copy_page_to_iter(page, 1351 iocb->ki_pos & ~PAGE_MASK, 1352 end - iocb->ki_pos, to); 1353 iocb->ki_pos += ret; 1354 read += ret; 1355 } 1356 if (iocb->ki_pos < i_size && read < len) { 1357 size_t zlen = min_t(size_t, len - read, 1358 i_size - iocb->ki_pos); 1359 ret = iov_iter_zero(zlen, to); 1360 iocb->ki_pos += ret; 1361 read += ret; 1362 } 1363 __free_pages(page, 0); 1364 return read; 1365 } 1366 1367 /* hit EOF or hole? */ 1368 if (retry_op == CHECK_EOF && iocb->ki_pos < i_size && 1369 ret < len) { 1370 dout("sync_read hit hole, ppos %lld < size %lld" 1371 ", reading more\n", iocb->ki_pos, i_size); 1372 1373 read += ret; 1374 len -= ret; 1375 retry_op = HAVE_RETRIED; 1376 goto again; 1377 } 1378 } 1379 1380 if (ret >= 0) 1381 ret += read; 1382 1383 return ret; 1384 } 1385 1386 /* 1387 * Take cap references to avoid releasing caps to MDS mid-write. 1388 * 1389 * If we are synchronous, and write with an old snap context, the OSD 1390 * may return EOLDSNAPC. In that case, retry the write.. _after_ 1391 * dropping our cap refs and allowing the pending snap to logically 1392 * complete _before_ this write occurs. 1393 * 1394 * If we are near ENOSPC, write synchronously. 1395 */ 1396 static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from) 1397 { 1398 struct file *file = iocb->ki_filp; 1399 struct ceph_file_info *fi = file->private_data; 1400 struct inode *inode = file_inode(file); 1401 struct ceph_inode_info *ci = ceph_inode(inode); 1402 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 1403 struct ceph_cap_flush *prealloc_cf; 1404 ssize_t count, written = 0; 1405 int err, want, got; 1406 loff_t pos; 1407 loff_t limit = max(i_size_read(inode), fsc->max_file_size); 1408 1409 if (ceph_snap(inode) != CEPH_NOSNAP) 1410 return -EROFS; 1411 1412 prealloc_cf = ceph_alloc_cap_flush(); 1413 if (!prealloc_cf) 1414 return -ENOMEM; 1415 1416 retry_snap: 1417 if (iocb->ki_flags & IOCB_DIRECT) 1418 ceph_start_io_direct(inode); 1419 else 1420 ceph_start_io_write(inode); 1421 1422 /* We can write back this queue in page reclaim */ 1423 current->backing_dev_info = inode_to_bdi(inode); 1424 1425 if (iocb->ki_flags & IOCB_APPEND) { 1426 err = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false); 1427 if (err < 0) 1428 goto out; 1429 } 1430 1431 err = generic_write_checks(iocb, from); 1432 if (err <= 0) 1433 goto out; 1434 1435 pos = iocb->ki_pos; 1436 if (unlikely(pos >= limit)) { 1437 err = -EFBIG; 1438 goto out; 1439 } else { 1440 iov_iter_truncate(from, limit - pos); 1441 } 1442 1443 count = iov_iter_count(from); 1444 if (ceph_quota_is_max_bytes_exceeded(inode, pos + count)) { 1445 err = -EDQUOT; 1446 goto out; 1447 } 1448 1449 err = file_remove_privs(file); 1450 if (err) 1451 goto out; 1452 1453 err = file_update_time(file); 1454 if (err) 1455 goto out; 1456 1457 inode_inc_iversion_raw(inode); 1458 1459 if (ci->i_inline_version != CEPH_INLINE_NONE) { 1460 err = ceph_uninline_data(file, NULL); 1461 if (err < 0) 1462 goto out; 1463 } 1464 1465 /* FIXME: not complete since it doesn't account for being at quota */ 1466 if (ceph_osdmap_flag(&fsc->client->osdc, CEPH_OSDMAP_FULL)) { 1467 err = -ENOSPC; 1468 goto out; 1469 } 1470 1471 dout("aio_write %p %llx.%llx %llu~%zd getting caps. i_size %llu\n", 1472 inode, ceph_vinop(inode), pos, count, i_size_read(inode)); 1473 if (fi->fmode & CEPH_FILE_MODE_LAZY) 1474 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; 1475 else 1476 want = CEPH_CAP_FILE_BUFFER; 1477 got = 0; 1478 err = ceph_get_caps(file, CEPH_CAP_FILE_WR, want, pos + count, 1479 &got, NULL); 1480 if (err < 0) 1481 goto out; 1482 1483 dout("aio_write %p %llx.%llx %llu~%zd got cap refs on %s\n", 1484 inode, ceph_vinop(inode), pos, count, ceph_cap_string(got)); 1485 1486 if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 || 1487 (iocb->ki_flags & IOCB_DIRECT) || (fi->flags & CEPH_F_SYNC) || 1488 (ci->i_ceph_flags & CEPH_I_ERROR_WRITE)) { 1489 struct ceph_snap_context *snapc; 1490 struct iov_iter data; 1491 1492 spin_lock(&ci->i_ceph_lock); 1493 if (__ceph_have_pending_cap_snap(ci)) { 1494 struct ceph_cap_snap *capsnap = 1495 list_last_entry(&ci->i_cap_snaps, 1496 struct ceph_cap_snap, 1497 ci_item); 1498 snapc = ceph_get_snap_context(capsnap->context); 1499 } else { 1500 BUG_ON(!ci->i_head_snapc); 1501 snapc = ceph_get_snap_context(ci->i_head_snapc); 1502 } 1503 spin_unlock(&ci->i_ceph_lock); 1504 1505 /* we might need to revert back to that point */ 1506 data = *from; 1507 if (iocb->ki_flags & IOCB_DIRECT) { 1508 written = ceph_direct_read_write(iocb, &data, snapc, 1509 &prealloc_cf); 1510 ceph_end_io_direct(inode); 1511 } else { 1512 written = ceph_sync_write(iocb, &data, pos, snapc); 1513 ceph_end_io_write(inode); 1514 } 1515 if (written > 0) 1516 iov_iter_advance(from, written); 1517 ceph_put_snap_context(snapc); 1518 } else { 1519 /* 1520 * No need to acquire the i_truncate_mutex. Because 1521 * the MDS revokes Fwb caps before sending truncate 1522 * message to us. We can't get Fwb cap while there 1523 * are pending vmtruncate. So write and vmtruncate 1524 * can not run at the same time 1525 */ 1526 written = generic_perform_write(file, from, pos); 1527 if (likely(written >= 0)) 1528 iocb->ki_pos = pos + written; 1529 ceph_end_io_write(inode); 1530 } 1531 1532 if (written >= 0) { 1533 int dirty; 1534 1535 spin_lock(&ci->i_ceph_lock); 1536 ci->i_inline_version = CEPH_INLINE_NONE; 1537 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR, 1538 &prealloc_cf); 1539 spin_unlock(&ci->i_ceph_lock); 1540 if (dirty) 1541 __mark_inode_dirty(inode, dirty); 1542 if (ceph_quota_is_max_bytes_approaching(inode, iocb->ki_pos)) 1543 ceph_check_caps(ci, CHECK_CAPS_NODELAY, NULL); 1544 } 1545 1546 dout("aio_write %p %llx.%llx %llu~%u dropping cap refs on %s\n", 1547 inode, ceph_vinop(inode), pos, (unsigned)count, 1548 ceph_cap_string(got)); 1549 ceph_put_cap_refs(ci, got); 1550 1551 if (written == -EOLDSNAPC) { 1552 dout("aio_write %p %llx.%llx %llu~%u" "got EOLDSNAPC, retrying\n", 1553 inode, ceph_vinop(inode), pos, (unsigned)count); 1554 goto retry_snap; 1555 } 1556 1557 if (written >= 0) { 1558 if (ceph_osdmap_flag(&fsc->client->osdc, CEPH_OSDMAP_NEARFULL)) 1559 iocb->ki_flags |= IOCB_DSYNC; 1560 written = generic_write_sync(iocb, written); 1561 } 1562 1563 goto out_unlocked; 1564 out: 1565 if (iocb->ki_flags & IOCB_DIRECT) 1566 ceph_end_io_direct(inode); 1567 else 1568 ceph_end_io_write(inode); 1569 out_unlocked: 1570 ceph_free_cap_flush(prealloc_cf); 1571 current->backing_dev_info = NULL; 1572 return written ? written : err; 1573 } 1574 1575 /* 1576 * llseek. be sure to verify file size on SEEK_END. 1577 */ 1578 static loff_t ceph_llseek(struct file *file, loff_t offset, int whence) 1579 { 1580 struct inode *inode = file->f_mapping->host; 1581 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 1582 loff_t i_size; 1583 loff_t ret; 1584 1585 inode_lock(inode); 1586 1587 if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) { 1588 ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false); 1589 if (ret < 0) 1590 goto out; 1591 } 1592 1593 i_size = i_size_read(inode); 1594 switch (whence) { 1595 case SEEK_END: 1596 offset += i_size; 1597 break; 1598 case SEEK_CUR: 1599 /* 1600 * Here we special-case the lseek(fd, 0, SEEK_CUR) 1601 * position-querying operation. Avoid rewriting the "same" 1602 * f_pos value back to the file because a concurrent read(), 1603 * write() or lseek() might have altered it 1604 */ 1605 if (offset == 0) { 1606 ret = file->f_pos; 1607 goto out; 1608 } 1609 offset += file->f_pos; 1610 break; 1611 case SEEK_DATA: 1612 if (offset < 0 || offset >= i_size) { 1613 ret = -ENXIO; 1614 goto out; 1615 } 1616 break; 1617 case SEEK_HOLE: 1618 if (offset < 0 || offset >= i_size) { 1619 ret = -ENXIO; 1620 goto out; 1621 } 1622 offset = i_size; 1623 break; 1624 } 1625 1626 ret = vfs_setpos(file, offset, max(i_size, fsc->max_file_size)); 1627 1628 out: 1629 inode_unlock(inode); 1630 return ret; 1631 } 1632 1633 static inline void ceph_zero_partial_page( 1634 struct inode *inode, loff_t offset, unsigned size) 1635 { 1636 struct page *page; 1637 pgoff_t index = offset >> PAGE_SHIFT; 1638 1639 page = find_lock_page(inode->i_mapping, index); 1640 if (page) { 1641 wait_on_page_writeback(page); 1642 zero_user(page, offset & (PAGE_SIZE - 1), size); 1643 unlock_page(page); 1644 put_page(page); 1645 } 1646 } 1647 1648 static void ceph_zero_pagecache_range(struct inode *inode, loff_t offset, 1649 loff_t length) 1650 { 1651 loff_t nearly = round_up(offset, PAGE_SIZE); 1652 if (offset < nearly) { 1653 loff_t size = nearly - offset; 1654 if (length < size) 1655 size = length; 1656 ceph_zero_partial_page(inode, offset, size); 1657 offset += size; 1658 length -= size; 1659 } 1660 if (length >= PAGE_SIZE) { 1661 loff_t size = round_down(length, PAGE_SIZE); 1662 truncate_pagecache_range(inode, offset, offset + size - 1); 1663 offset += size; 1664 length -= size; 1665 } 1666 if (length) 1667 ceph_zero_partial_page(inode, offset, length); 1668 } 1669 1670 static int ceph_zero_partial_object(struct inode *inode, 1671 loff_t offset, loff_t *length) 1672 { 1673 struct ceph_inode_info *ci = ceph_inode(inode); 1674 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 1675 struct ceph_osd_request *req; 1676 int ret = 0; 1677 loff_t zero = 0; 1678 int op; 1679 1680 if (!length) { 1681 op = offset ? CEPH_OSD_OP_DELETE : CEPH_OSD_OP_TRUNCATE; 1682 length = &zero; 1683 } else { 1684 op = CEPH_OSD_OP_ZERO; 1685 } 1686 1687 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, 1688 ceph_vino(inode), 1689 offset, length, 1690 0, 1, op, 1691 CEPH_OSD_FLAG_WRITE, 1692 NULL, 0, 0, false); 1693 if (IS_ERR(req)) { 1694 ret = PTR_ERR(req); 1695 goto out; 1696 } 1697 1698 req->r_mtime = inode->i_mtime; 1699 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false); 1700 if (!ret) { 1701 ret = ceph_osdc_wait_request(&fsc->client->osdc, req); 1702 if (ret == -ENOENT) 1703 ret = 0; 1704 } 1705 ceph_osdc_put_request(req); 1706 1707 out: 1708 return ret; 1709 } 1710 1711 static int ceph_zero_objects(struct inode *inode, loff_t offset, loff_t length) 1712 { 1713 int ret = 0; 1714 struct ceph_inode_info *ci = ceph_inode(inode); 1715 s32 stripe_unit = ci->i_layout.stripe_unit; 1716 s32 stripe_count = ci->i_layout.stripe_count; 1717 s32 object_size = ci->i_layout.object_size; 1718 u64 object_set_size = object_size * stripe_count; 1719 u64 nearly, t; 1720 1721 /* round offset up to next period boundary */ 1722 nearly = offset + object_set_size - 1; 1723 t = nearly; 1724 nearly -= do_div(t, object_set_size); 1725 1726 while (length && offset < nearly) { 1727 loff_t size = length; 1728 ret = ceph_zero_partial_object(inode, offset, &size); 1729 if (ret < 0) 1730 return ret; 1731 offset += size; 1732 length -= size; 1733 } 1734 while (length >= object_set_size) { 1735 int i; 1736 loff_t pos = offset; 1737 for (i = 0; i < stripe_count; ++i) { 1738 ret = ceph_zero_partial_object(inode, pos, NULL); 1739 if (ret < 0) 1740 return ret; 1741 pos += stripe_unit; 1742 } 1743 offset += object_set_size; 1744 length -= object_set_size; 1745 } 1746 while (length) { 1747 loff_t size = length; 1748 ret = ceph_zero_partial_object(inode, offset, &size); 1749 if (ret < 0) 1750 return ret; 1751 offset += size; 1752 length -= size; 1753 } 1754 return ret; 1755 } 1756 1757 static long ceph_fallocate(struct file *file, int mode, 1758 loff_t offset, loff_t length) 1759 { 1760 struct ceph_file_info *fi = file->private_data; 1761 struct inode *inode = file_inode(file); 1762 struct ceph_inode_info *ci = ceph_inode(inode); 1763 struct ceph_cap_flush *prealloc_cf; 1764 int want, got = 0; 1765 int dirty; 1766 int ret = 0; 1767 loff_t endoff = 0; 1768 loff_t size; 1769 1770 if (mode != (FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE)) 1771 return -EOPNOTSUPP; 1772 1773 if (!S_ISREG(inode->i_mode)) 1774 return -EOPNOTSUPP; 1775 1776 prealloc_cf = ceph_alloc_cap_flush(); 1777 if (!prealloc_cf) 1778 return -ENOMEM; 1779 1780 inode_lock(inode); 1781 1782 if (ceph_snap(inode) != CEPH_NOSNAP) { 1783 ret = -EROFS; 1784 goto unlock; 1785 } 1786 1787 if (ci->i_inline_version != CEPH_INLINE_NONE) { 1788 ret = ceph_uninline_data(file, NULL); 1789 if (ret < 0) 1790 goto unlock; 1791 } 1792 1793 size = i_size_read(inode); 1794 1795 /* Are we punching a hole beyond EOF? */ 1796 if (offset >= size) 1797 goto unlock; 1798 if ((offset + length) > size) 1799 length = size - offset; 1800 1801 if (fi->fmode & CEPH_FILE_MODE_LAZY) 1802 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; 1803 else 1804 want = CEPH_CAP_FILE_BUFFER; 1805 1806 ret = ceph_get_caps(file, CEPH_CAP_FILE_WR, want, endoff, &got, NULL); 1807 if (ret < 0) 1808 goto unlock; 1809 1810 ceph_zero_pagecache_range(inode, offset, length); 1811 ret = ceph_zero_objects(inode, offset, length); 1812 1813 if (!ret) { 1814 spin_lock(&ci->i_ceph_lock); 1815 ci->i_inline_version = CEPH_INLINE_NONE; 1816 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR, 1817 &prealloc_cf); 1818 spin_unlock(&ci->i_ceph_lock); 1819 if (dirty) 1820 __mark_inode_dirty(inode, dirty); 1821 } 1822 1823 ceph_put_cap_refs(ci, got); 1824 unlock: 1825 inode_unlock(inode); 1826 ceph_free_cap_flush(prealloc_cf); 1827 return ret; 1828 } 1829 1830 /* 1831 * This function tries to get FILE_WR capabilities for dst_ci and FILE_RD for 1832 * src_ci. Two attempts are made to obtain both caps, and an error is return if 1833 * this fails; zero is returned on success. 1834 */ 1835 static int get_rd_wr_caps(struct file *src_filp, int *src_got, 1836 struct file *dst_filp, 1837 loff_t dst_endoff, int *dst_got) 1838 { 1839 int ret = 0; 1840 bool retrying = false; 1841 1842 retry_caps: 1843 ret = ceph_get_caps(dst_filp, CEPH_CAP_FILE_WR, CEPH_CAP_FILE_BUFFER, 1844 dst_endoff, dst_got, NULL); 1845 if (ret < 0) 1846 return ret; 1847 1848 /* 1849 * Since we're already holding the FILE_WR capability for the dst file, 1850 * we would risk a deadlock by using ceph_get_caps. Thus, we'll do some 1851 * retry dance instead to try to get both capabilities. 1852 */ 1853 ret = ceph_try_get_caps(file_inode(src_filp), 1854 CEPH_CAP_FILE_RD, CEPH_CAP_FILE_SHARED, 1855 false, src_got); 1856 if (ret <= 0) { 1857 /* Start by dropping dst_ci caps and getting src_ci caps */ 1858 ceph_put_cap_refs(ceph_inode(file_inode(dst_filp)), *dst_got); 1859 if (retrying) { 1860 if (!ret) 1861 /* ceph_try_get_caps masks EAGAIN */ 1862 ret = -EAGAIN; 1863 return ret; 1864 } 1865 ret = ceph_get_caps(src_filp, CEPH_CAP_FILE_RD, 1866 CEPH_CAP_FILE_SHARED, -1, src_got, NULL); 1867 if (ret < 0) 1868 return ret; 1869 /*... drop src_ci caps too, and retry */ 1870 ceph_put_cap_refs(ceph_inode(file_inode(src_filp)), *src_got); 1871 retrying = true; 1872 goto retry_caps; 1873 } 1874 return ret; 1875 } 1876 1877 static void put_rd_wr_caps(struct ceph_inode_info *src_ci, int src_got, 1878 struct ceph_inode_info *dst_ci, int dst_got) 1879 { 1880 ceph_put_cap_refs(src_ci, src_got); 1881 ceph_put_cap_refs(dst_ci, dst_got); 1882 } 1883 1884 /* 1885 * This function does several size-related checks, returning an error if: 1886 * - source file is smaller than off+len 1887 * - destination file size is not OK (inode_newsize_ok()) 1888 * - max bytes quotas is exceeded 1889 */ 1890 static int is_file_size_ok(struct inode *src_inode, struct inode *dst_inode, 1891 loff_t src_off, loff_t dst_off, size_t len) 1892 { 1893 loff_t size, endoff; 1894 1895 size = i_size_read(src_inode); 1896 /* 1897 * Don't copy beyond source file EOF. Instead of simply setting length 1898 * to (size - src_off), just drop to VFS default implementation, as the 1899 * local i_size may be stale due to other clients writing to the source 1900 * inode. 1901 */ 1902 if (src_off + len > size) { 1903 dout("Copy beyond EOF (%llu + %zu > %llu)\n", 1904 src_off, len, size); 1905 return -EOPNOTSUPP; 1906 } 1907 size = i_size_read(dst_inode); 1908 1909 endoff = dst_off + len; 1910 if (inode_newsize_ok(dst_inode, endoff)) 1911 return -EOPNOTSUPP; 1912 1913 if (ceph_quota_is_max_bytes_exceeded(dst_inode, endoff)) 1914 return -EDQUOT; 1915 1916 return 0; 1917 } 1918 1919 static ssize_t __ceph_copy_file_range(struct file *src_file, loff_t src_off, 1920 struct file *dst_file, loff_t dst_off, 1921 size_t len, unsigned int flags) 1922 { 1923 struct inode *src_inode = file_inode(src_file); 1924 struct inode *dst_inode = file_inode(dst_file); 1925 struct ceph_inode_info *src_ci = ceph_inode(src_inode); 1926 struct ceph_inode_info *dst_ci = ceph_inode(dst_inode); 1927 struct ceph_cap_flush *prealloc_cf; 1928 struct ceph_fs_client *src_fsc = ceph_inode_to_client(src_inode); 1929 struct ceph_object_locator src_oloc, dst_oloc; 1930 struct ceph_object_id src_oid, dst_oid; 1931 loff_t endoff = 0, size; 1932 ssize_t ret = -EIO; 1933 u64 src_objnum, dst_objnum, src_objoff, dst_objoff; 1934 u32 src_objlen, dst_objlen, object_size; 1935 int src_got = 0, dst_got = 0, err, dirty; 1936 bool do_final_copy = false; 1937 1938 if (src_inode->i_sb != dst_inode->i_sb) { 1939 struct ceph_fs_client *dst_fsc = ceph_inode_to_client(dst_inode); 1940 1941 if (ceph_fsid_compare(&src_fsc->client->fsid, 1942 &dst_fsc->client->fsid)) { 1943 dout("Copying files across clusters: src: %pU dst: %pU\n", 1944 &src_fsc->client->fsid, &dst_fsc->client->fsid); 1945 return -EXDEV; 1946 } 1947 } 1948 if (ceph_snap(dst_inode) != CEPH_NOSNAP) 1949 return -EROFS; 1950 1951 /* 1952 * Some of the checks below will return -EOPNOTSUPP, which will force a 1953 * fallback to the default VFS copy_file_range implementation. This is 1954 * desirable in several cases (for ex, the 'len' is smaller than the 1955 * size of the objects, or in cases where that would be more 1956 * efficient). 1957 */ 1958 1959 if (ceph_test_mount_opt(src_fsc, NOCOPYFROM)) 1960 return -EOPNOTSUPP; 1961 1962 /* 1963 * Striped file layouts require that we copy partial objects, but the 1964 * OSD copy-from operation only supports full-object copies. Limit 1965 * this to non-striped file layouts for now. 1966 */ 1967 if ((src_ci->i_layout.stripe_unit != dst_ci->i_layout.stripe_unit) || 1968 (src_ci->i_layout.stripe_count != 1) || 1969 (dst_ci->i_layout.stripe_count != 1) || 1970 (src_ci->i_layout.object_size != dst_ci->i_layout.object_size)) { 1971 dout("Invalid src/dst files layout\n"); 1972 return -EOPNOTSUPP; 1973 } 1974 1975 if (len < src_ci->i_layout.object_size) 1976 return -EOPNOTSUPP; /* no remote copy will be done */ 1977 1978 prealloc_cf = ceph_alloc_cap_flush(); 1979 if (!prealloc_cf) 1980 return -ENOMEM; 1981 1982 /* Start by sync'ing the source and destination files */ 1983 ret = file_write_and_wait_range(src_file, src_off, (src_off + len)); 1984 if (ret < 0) { 1985 dout("failed to write src file (%zd)\n", ret); 1986 goto out; 1987 } 1988 ret = file_write_and_wait_range(dst_file, dst_off, (dst_off + len)); 1989 if (ret < 0) { 1990 dout("failed to write dst file (%zd)\n", ret); 1991 goto out; 1992 } 1993 1994 /* 1995 * We need FILE_WR caps for dst_ci and FILE_RD for src_ci as other 1996 * clients may have dirty data in their caches. And OSDs know nothing 1997 * about caps, so they can't safely do the remote object copies. 1998 */ 1999 err = get_rd_wr_caps(src_file, &src_got, 2000 dst_file, (dst_off + len), &dst_got); 2001 if (err < 0) { 2002 dout("get_rd_wr_caps returned %d\n", err); 2003 ret = -EOPNOTSUPP; 2004 goto out; 2005 } 2006 2007 ret = is_file_size_ok(src_inode, dst_inode, src_off, dst_off, len); 2008 if (ret < 0) 2009 goto out_caps; 2010 2011 size = i_size_read(dst_inode); 2012 endoff = dst_off + len; 2013 2014 /* Drop dst file cached pages */ 2015 ret = invalidate_inode_pages2_range(dst_inode->i_mapping, 2016 dst_off >> PAGE_SHIFT, 2017 endoff >> PAGE_SHIFT); 2018 if (ret < 0) { 2019 dout("Failed to invalidate inode pages (%zd)\n", ret); 2020 ret = 0; /* XXX */ 2021 } 2022 src_oloc.pool = src_ci->i_layout.pool_id; 2023 src_oloc.pool_ns = ceph_try_get_string(src_ci->i_layout.pool_ns); 2024 dst_oloc.pool = dst_ci->i_layout.pool_id; 2025 dst_oloc.pool_ns = ceph_try_get_string(dst_ci->i_layout.pool_ns); 2026 2027 ceph_calc_file_object_mapping(&src_ci->i_layout, src_off, 2028 src_ci->i_layout.object_size, 2029 &src_objnum, &src_objoff, &src_objlen); 2030 ceph_calc_file_object_mapping(&dst_ci->i_layout, dst_off, 2031 dst_ci->i_layout.object_size, 2032 &dst_objnum, &dst_objoff, &dst_objlen); 2033 /* object-level offsets need to the same */ 2034 if (src_objoff != dst_objoff) { 2035 ret = -EOPNOTSUPP; 2036 goto out_caps; 2037 } 2038 2039 /* 2040 * Do a manual copy if the object offset isn't object aligned. 2041 * 'src_objlen' contains the bytes left until the end of the object, 2042 * starting at the src_off 2043 */ 2044 if (src_objoff) { 2045 /* 2046 * we need to temporarily drop all caps as we'll be calling 2047 * {read,write}_iter, which will get caps again. 2048 */ 2049 put_rd_wr_caps(src_ci, src_got, dst_ci, dst_got); 2050 ret = do_splice_direct(src_file, &src_off, dst_file, 2051 &dst_off, src_objlen, flags); 2052 if (ret < 0) { 2053 dout("do_splice_direct returned %d\n", err); 2054 goto out; 2055 } 2056 len -= ret; 2057 err = get_rd_wr_caps(src_file, &src_got, 2058 dst_file, (dst_off + len), &dst_got); 2059 if (err < 0) 2060 goto out; 2061 err = is_file_size_ok(src_inode, dst_inode, 2062 src_off, dst_off, len); 2063 if (err < 0) 2064 goto out_caps; 2065 } 2066 object_size = src_ci->i_layout.object_size; 2067 while (len >= object_size) { 2068 ceph_calc_file_object_mapping(&src_ci->i_layout, src_off, 2069 object_size, &src_objnum, 2070 &src_objoff, &src_objlen); 2071 ceph_calc_file_object_mapping(&dst_ci->i_layout, dst_off, 2072 object_size, &dst_objnum, 2073 &dst_objoff, &dst_objlen); 2074 ceph_oid_init(&src_oid); 2075 ceph_oid_printf(&src_oid, "%llx.%08llx", 2076 src_ci->i_vino.ino, src_objnum); 2077 ceph_oid_init(&dst_oid); 2078 ceph_oid_printf(&dst_oid, "%llx.%08llx", 2079 dst_ci->i_vino.ino, dst_objnum); 2080 /* Do an object remote copy */ 2081 err = ceph_osdc_copy_from( 2082 &src_fsc->client->osdc, 2083 src_ci->i_vino.snap, 0, 2084 &src_oid, &src_oloc, 2085 CEPH_OSD_OP_FLAG_FADVISE_SEQUENTIAL | 2086 CEPH_OSD_OP_FLAG_FADVISE_NOCACHE, 2087 &dst_oid, &dst_oloc, 2088 CEPH_OSD_OP_FLAG_FADVISE_SEQUENTIAL | 2089 CEPH_OSD_OP_FLAG_FADVISE_DONTNEED, 0); 2090 if (err) { 2091 dout("ceph_osdc_copy_from returned %d\n", err); 2092 if (!ret) 2093 ret = err; 2094 goto out_caps; 2095 } 2096 len -= object_size; 2097 src_off += object_size; 2098 dst_off += object_size; 2099 ret += object_size; 2100 } 2101 2102 if (len) 2103 /* We still need one final local copy */ 2104 do_final_copy = true; 2105 2106 file_update_time(dst_file); 2107 inode_inc_iversion_raw(dst_inode); 2108 2109 if (endoff > size) { 2110 int caps_flags = 0; 2111 2112 /* Let the MDS know about dst file size change */ 2113 if (ceph_quota_is_max_bytes_approaching(dst_inode, endoff)) 2114 caps_flags |= CHECK_CAPS_NODELAY; 2115 if (ceph_inode_set_size(dst_inode, endoff)) 2116 caps_flags |= CHECK_CAPS_AUTHONLY; 2117 if (caps_flags) 2118 ceph_check_caps(dst_ci, caps_flags, NULL); 2119 } 2120 /* Mark Fw dirty */ 2121 spin_lock(&dst_ci->i_ceph_lock); 2122 dst_ci->i_inline_version = CEPH_INLINE_NONE; 2123 dirty = __ceph_mark_dirty_caps(dst_ci, CEPH_CAP_FILE_WR, &prealloc_cf); 2124 spin_unlock(&dst_ci->i_ceph_lock); 2125 if (dirty) 2126 __mark_inode_dirty(dst_inode, dirty); 2127 2128 out_caps: 2129 put_rd_wr_caps(src_ci, src_got, dst_ci, dst_got); 2130 2131 if (do_final_copy) { 2132 err = do_splice_direct(src_file, &src_off, dst_file, 2133 &dst_off, len, flags); 2134 if (err < 0) { 2135 dout("do_splice_direct returned %d\n", err); 2136 goto out; 2137 } 2138 len -= err; 2139 ret += err; 2140 } 2141 2142 out: 2143 ceph_free_cap_flush(prealloc_cf); 2144 2145 return ret; 2146 } 2147 2148 static ssize_t ceph_copy_file_range(struct file *src_file, loff_t src_off, 2149 struct file *dst_file, loff_t dst_off, 2150 size_t len, unsigned int flags) 2151 { 2152 ssize_t ret; 2153 2154 ret = __ceph_copy_file_range(src_file, src_off, dst_file, dst_off, 2155 len, flags); 2156 2157 if (ret == -EOPNOTSUPP || ret == -EXDEV) 2158 ret = generic_copy_file_range(src_file, src_off, dst_file, 2159 dst_off, len, flags); 2160 return ret; 2161 } 2162 2163 const struct file_operations ceph_file_fops = { 2164 .open = ceph_open, 2165 .release = ceph_release, 2166 .llseek = ceph_llseek, 2167 .read_iter = ceph_read_iter, 2168 .write_iter = ceph_write_iter, 2169 .mmap = ceph_mmap, 2170 .fsync = ceph_fsync, 2171 .lock = ceph_lock, 2172 .flock = ceph_flock, 2173 .splice_read = generic_file_splice_read, 2174 .splice_write = iter_file_splice_write, 2175 .unlocked_ioctl = ceph_ioctl, 2176 .compat_ioctl = ceph_ioctl, 2177 .fallocate = ceph_fallocate, 2178 .copy_file_range = ceph_copy_file_range, 2179 }; 2180