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 #include <linux/ktime.h> 15 16 #include "super.h" 17 #include "mds_client.h" 18 #include "cache.h" 19 #include "io.h" 20 #include "metric.h" 21 22 static __le32 ceph_flags_sys2wire(u32 flags) 23 { 24 u32 wire_flags = 0; 25 26 switch (flags & O_ACCMODE) { 27 case O_RDONLY: 28 wire_flags |= CEPH_O_RDONLY; 29 break; 30 case O_WRONLY: 31 wire_flags |= CEPH_O_WRONLY; 32 break; 33 case O_RDWR: 34 wire_flags |= CEPH_O_RDWR; 35 break; 36 } 37 38 flags &= ~O_ACCMODE; 39 40 #define ceph_sys2wire(a) if (flags & a) { wire_flags |= CEPH_##a; flags &= ~a; } 41 42 ceph_sys2wire(O_CREAT); 43 ceph_sys2wire(O_EXCL); 44 ceph_sys2wire(O_TRUNC); 45 ceph_sys2wire(O_DIRECTORY); 46 ceph_sys2wire(O_NOFOLLOW); 47 48 #undef ceph_sys2wire 49 50 if (flags) 51 dout("unused open flags: %x\n", flags); 52 53 return cpu_to_le32(wire_flags); 54 } 55 56 /* 57 * Ceph file operations 58 * 59 * Implement basic open/close functionality, and implement 60 * read/write. 61 * 62 * We implement three modes of file I/O: 63 * - buffered uses the generic_file_aio_{read,write} helpers 64 * 65 * - synchronous is used when there is multi-client read/write 66 * sharing, avoids the page cache, and synchronously waits for an 67 * ack from the OSD. 68 * 69 * - direct io takes the variant of the sync path that references 70 * user pages directly. 71 * 72 * fsync() flushes and waits on dirty pages, but just queues metadata 73 * for writeback: since the MDS can recover size and mtime there is no 74 * need to wait for MDS acknowledgement. 75 */ 76 77 /* 78 * How many pages to get in one call to iov_iter_get_pages(). This 79 * determines the size of the on-stack array used as a buffer. 80 */ 81 #define ITER_GET_BVECS_PAGES 64 82 83 static ssize_t __iter_get_bvecs(struct iov_iter *iter, size_t maxsize, 84 struct bio_vec *bvecs) 85 { 86 size_t size = 0; 87 int bvec_idx = 0; 88 89 if (maxsize > iov_iter_count(iter)) 90 maxsize = iov_iter_count(iter); 91 92 while (size < maxsize) { 93 struct page *pages[ITER_GET_BVECS_PAGES]; 94 ssize_t bytes; 95 size_t start; 96 int idx = 0; 97 98 bytes = iov_iter_get_pages(iter, pages, maxsize - size, 99 ITER_GET_BVECS_PAGES, &start); 100 if (bytes < 0) 101 return size ?: bytes; 102 103 iov_iter_advance(iter, bytes); 104 size += bytes; 105 106 for ( ; bytes; idx++, bvec_idx++) { 107 struct bio_vec bv = { 108 .bv_page = pages[idx], 109 .bv_len = min_t(int, bytes, PAGE_SIZE - start), 110 .bv_offset = start, 111 }; 112 113 bvecs[bvec_idx] = bv; 114 bytes -= bv.bv_len; 115 start = 0; 116 } 117 } 118 119 return size; 120 } 121 122 /* 123 * iov_iter_get_pages() only considers one iov_iter segment, no matter 124 * what maxsize or maxpages are given. For ITER_BVEC that is a single 125 * page. 126 * 127 * Attempt to get up to @maxsize bytes worth of pages from @iter. 128 * Return the number of bytes in the created bio_vec array, or an error. 129 */ 130 static ssize_t iter_get_bvecs_alloc(struct iov_iter *iter, size_t maxsize, 131 struct bio_vec **bvecs, int *num_bvecs) 132 { 133 struct bio_vec *bv; 134 size_t orig_count = iov_iter_count(iter); 135 ssize_t bytes; 136 int npages; 137 138 iov_iter_truncate(iter, maxsize); 139 npages = iov_iter_npages(iter, INT_MAX); 140 iov_iter_reexpand(iter, orig_count); 141 142 /* 143 * __iter_get_bvecs() may populate only part of the array -- zero it 144 * out. 145 */ 146 bv = kvmalloc_array(npages, sizeof(*bv), GFP_KERNEL | __GFP_ZERO); 147 if (!bv) 148 return -ENOMEM; 149 150 bytes = __iter_get_bvecs(iter, maxsize, bv); 151 if (bytes < 0) { 152 /* 153 * No pages were pinned -- just free the array. 154 */ 155 kvfree(bv); 156 return bytes; 157 } 158 159 *bvecs = bv; 160 *num_bvecs = npages; 161 return bytes; 162 } 163 164 static void put_bvecs(struct bio_vec *bvecs, int num_bvecs, bool should_dirty) 165 { 166 int i; 167 168 for (i = 0; i < num_bvecs; i++) { 169 if (bvecs[i].bv_page) { 170 if (should_dirty) 171 set_page_dirty_lock(bvecs[i].bv_page); 172 put_page(bvecs[i].bv_page); 173 } 174 } 175 kvfree(bvecs); 176 } 177 178 /* 179 * Prepare an open request. Preallocate ceph_cap to avoid an 180 * inopportune ENOMEM later. 181 */ 182 static struct ceph_mds_request * 183 prepare_open_request(struct super_block *sb, int flags, int create_mode) 184 { 185 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(sb); 186 struct ceph_mds_request *req; 187 int want_auth = USE_ANY_MDS; 188 int op = (flags & O_CREAT) ? CEPH_MDS_OP_CREATE : CEPH_MDS_OP_OPEN; 189 190 if (flags & (O_WRONLY|O_RDWR|O_CREAT|O_TRUNC)) 191 want_auth = USE_AUTH_MDS; 192 193 req = ceph_mdsc_create_request(mdsc, op, want_auth); 194 if (IS_ERR(req)) 195 goto out; 196 req->r_fmode = ceph_flags_to_mode(flags); 197 req->r_args.open.flags = ceph_flags_sys2wire(flags); 198 req->r_args.open.mode = cpu_to_le32(create_mode); 199 out: 200 return req; 201 } 202 203 static int ceph_init_file_info(struct inode *inode, struct file *file, 204 int fmode, bool isdir) 205 { 206 struct ceph_inode_info *ci = ceph_inode(inode); 207 struct ceph_mount_options *opt = 208 ceph_inode_to_client(&ci->vfs_inode)->mount_options; 209 struct ceph_file_info *fi; 210 int ret; 211 212 dout("%s %p %p 0%o (%s)\n", __func__, inode, file, 213 inode->i_mode, isdir ? "dir" : "regular"); 214 BUG_ON(inode->i_fop->release != ceph_release); 215 216 if (isdir) { 217 struct ceph_dir_file_info *dfi = 218 kmem_cache_zalloc(ceph_dir_file_cachep, GFP_KERNEL); 219 if (!dfi) 220 return -ENOMEM; 221 222 file->private_data = dfi; 223 fi = &dfi->file_info; 224 dfi->next_offset = 2; 225 dfi->readdir_cache_idx = -1; 226 } else { 227 fi = kmem_cache_zalloc(ceph_file_cachep, GFP_KERNEL); 228 if (!fi) 229 return -ENOMEM; 230 231 if (opt->flags & CEPH_MOUNT_OPT_NOPAGECACHE) 232 fi->flags |= CEPH_F_SYNC; 233 234 file->private_data = fi; 235 } 236 237 ceph_get_fmode(ci, fmode, 1); 238 fi->fmode = fmode; 239 240 spin_lock_init(&fi->rw_contexts_lock); 241 INIT_LIST_HEAD(&fi->rw_contexts); 242 fi->filp_gen = READ_ONCE(ceph_inode_to_client(inode)->filp_gen); 243 244 if ((file->f_mode & FMODE_WRITE) && 245 ci->i_inline_version != CEPH_INLINE_NONE) { 246 ret = ceph_uninline_data(file); 247 if (ret < 0) 248 goto error; 249 } 250 251 return 0; 252 253 error: 254 ceph_fscache_unuse_cookie(inode, file->f_mode & FMODE_WRITE); 255 ceph_put_fmode(ci, fi->fmode, 1); 256 kmem_cache_free(ceph_file_cachep, fi); 257 /* wake up anyone waiting for caps on this inode */ 258 wake_up_all(&ci->i_cap_wq); 259 return ret; 260 } 261 262 /* 263 * initialize private struct file data. 264 * if we fail, clean up by dropping fmode reference on the ceph_inode 265 */ 266 static int ceph_init_file(struct inode *inode, struct file *file, int fmode) 267 { 268 int ret = 0; 269 270 switch (inode->i_mode & S_IFMT) { 271 case S_IFREG: 272 ceph_fscache_use_cookie(inode, file->f_mode & FMODE_WRITE); 273 fallthrough; 274 case S_IFDIR: 275 ret = ceph_init_file_info(inode, file, fmode, 276 S_ISDIR(inode->i_mode)); 277 break; 278 279 case S_IFLNK: 280 dout("init_file %p %p 0%o (symlink)\n", inode, file, 281 inode->i_mode); 282 break; 283 284 default: 285 dout("init_file %p %p 0%o (special)\n", inode, file, 286 inode->i_mode); 287 /* 288 * we need to drop the open ref now, since we don't 289 * have .release set to ceph_release. 290 */ 291 BUG_ON(inode->i_fop->release == ceph_release); 292 293 /* call the proper open fop */ 294 ret = inode->i_fop->open(inode, file); 295 } 296 return ret; 297 } 298 299 /* 300 * try renew caps after session gets killed. 301 */ 302 int ceph_renew_caps(struct inode *inode, int fmode) 303 { 304 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb); 305 struct ceph_inode_info *ci = ceph_inode(inode); 306 struct ceph_mds_request *req; 307 int err, flags, wanted; 308 309 spin_lock(&ci->i_ceph_lock); 310 __ceph_touch_fmode(ci, mdsc, fmode); 311 wanted = __ceph_caps_file_wanted(ci); 312 if (__ceph_is_any_real_caps(ci) && 313 (!(wanted & CEPH_CAP_ANY_WR) || ci->i_auth_cap)) { 314 int issued = __ceph_caps_issued(ci, NULL); 315 spin_unlock(&ci->i_ceph_lock); 316 dout("renew caps %p want %s issued %s updating mds_wanted\n", 317 inode, ceph_cap_string(wanted), ceph_cap_string(issued)); 318 ceph_check_caps(ci, 0, NULL); 319 return 0; 320 } 321 spin_unlock(&ci->i_ceph_lock); 322 323 flags = 0; 324 if ((wanted & CEPH_CAP_FILE_RD) && (wanted & CEPH_CAP_FILE_WR)) 325 flags = O_RDWR; 326 else if (wanted & CEPH_CAP_FILE_RD) 327 flags = O_RDONLY; 328 else if (wanted & CEPH_CAP_FILE_WR) 329 flags = O_WRONLY; 330 #ifdef O_LAZY 331 if (wanted & CEPH_CAP_FILE_LAZYIO) 332 flags |= O_LAZY; 333 #endif 334 335 req = prepare_open_request(inode->i_sb, flags, 0); 336 if (IS_ERR(req)) { 337 err = PTR_ERR(req); 338 goto out; 339 } 340 341 req->r_inode = inode; 342 ihold(inode); 343 req->r_num_caps = 1; 344 345 err = ceph_mdsc_do_request(mdsc, NULL, req); 346 ceph_mdsc_put_request(req); 347 out: 348 dout("renew caps %p open result=%d\n", inode, err); 349 return err < 0 ? err : 0; 350 } 351 352 /* 353 * If we already have the requisite capabilities, we can satisfy 354 * the open request locally (no need to request new caps from the 355 * MDS). We do, however, need to inform the MDS (asynchronously) 356 * if our wanted caps set expands. 357 */ 358 int ceph_open(struct inode *inode, struct file *file) 359 { 360 struct ceph_inode_info *ci = ceph_inode(inode); 361 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb); 362 struct ceph_mds_client *mdsc = fsc->mdsc; 363 struct ceph_mds_request *req; 364 struct ceph_file_info *fi = file->private_data; 365 int err; 366 int flags, fmode, wanted; 367 368 if (fi) { 369 dout("open file %p is already opened\n", file); 370 return 0; 371 } 372 373 /* filter out O_CREAT|O_EXCL; vfs did that already. yuck. */ 374 flags = file->f_flags & ~(O_CREAT|O_EXCL); 375 if (S_ISDIR(inode->i_mode)) 376 flags = O_DIRECTORY; /* mds likes to know */ 377 378 dout("open inode %p ino %llx.%llx file %p flags %d (%d)\n", inode, 379 ceph_vinop(inode), file, flags, file->f_flags); 380 fmode = ceph_flags_to_mode(flags); 381 wanted = ceph_caps_for_mode(fmode); 382 383 /* snapped files are read-only */ 384 if (ceph_snap(inode) != CEPH_NOSNAP && (file->f_mode & FMODE_WRITE)) 385 return -EROFS; 386 387 /* trivially open snapdir */ 388 if (ceph_snap(inode) == CEPH_SNAPDIR) { 389 return ceph_init_file(inode, file, fmode); 390 } 391 392 /* 393 * No need to block if we have caps on the auth MDS (for 394 * write) or any MDS (for read). Update wanted set 395 * asynchronously. 396 */ 397 spin_lock(&ci->i_ceph_lock); 398 if (__ceph_is_any_real_caps(ci) && 399 (((fmode & CEPH_FILE_MODE_WR) == 0) || ci->i_auth_cap)) { 400 int mds_wanted = __ceph_caps_mds_wanted(ci, true); 401 int issued = __ceph_caps_issued(ci, NULL); 402 403 dout("open %p fmode %d want %s issued %s using existing\n", 404 inode, fmode, ceph_cap_string(wanted), 405 ceph_cap_string(issued)); 406 __ceph_touch_fmode(ci, mdsc, fmode); 407 spin_unlock(&ci->i_ceph_lock); 408 409 /* adjust wanted? */ 410 if ((issued & wanted) != wanted && 411 (mds_wanted & wanted) != wanted && 412 ceph_snap(inode) != CEPH_SNAPDIR) 413 ceph_check_caps(ci, 0, NULL); 414 415 return ceph_init_file(inode, file, fmode); 416 } else if (ceph_snap(inode) != CEPH_NOSNAP && 417 (ci->i_snap_caps & wanted) == wanted) { 418 __ceph_touch_fmode(ci, mdsc, fmode); 419 spin_unlock(&ci->i_ceph_lock); 420 return ceph_init_file(inode, file, fmode); 421 } 422 423 spin_unlock(&ci->i_ceph_lock); 424 425 dout("open fmode %d wants %s\n", fmode, ceph_cap_string(wanted)); 426 req = prepare_open_request(inode->i_sb, flags, 0); 427 if (IS_ERR(req)) { 428 err = PTR_ERR(req); 429 goto out; 430 } 431 req->r_inode = inode; 432 ihold(inode); 433 434 req->r_num_caps = 1; 435 err = ceph_mdsc_do_request(mdsc, NULL, req); 436 if (!err) 437 err = ceph_init_file(inode, file, req->r_fmode); 438 ceph_mdsc_put_request(req); 439 dout("open result=%d on %llx.%llx\n", err, ceph_vinop(inode)); 440 out: 441 return err; 442 } 443 444 /* Clone the layout from a synchronous create, if the dir now has Dc caps */ 445 static void 446 cache_file_layout(struct inode *dst, struct inode *src) 447 { 448 struct ceph_inode_info *cdst = ceph_inode(dst); 449 struct ceph_inode_info *csrc = ceph_inode(src); 450 451 spin_lock(&cdst->i_ceph_lock); 452 if ((__ceph_caps_issued(cdst, NULL) & CEPH_CAP_DIR_CREATE) && 453 !ceph_file_layout_is_valid(&cdst->i_cached_layout)) { 454 memcpy(&cdst->i_cached_layout, &csrc->i_layout, 455 sizeof(cdst->i_cached_layout)); 456 rcu_assign_pointer(cdst->i_cached_layout.pool_ns, 457 ceph_try_get_string(csrc->i_layout.pool_ns)); 458 } 459 spin_unlock(&cdst->i_ceph_lock); 460 } 461 462 /* 463 * Try to set up an async create. We need caps, a file layout, and inode number, 464 * and either a lease on the dentry or complete dir info. If any of those 465 * criteria are not satisfied, then return false and the caller can go 466 * synchronous. 467 */ 468 static int try_prep_async_create(struct inode *dir, struct dentry *dentry, 469 struct ceph_file_layout *lo, u64 *pino) 470 { 471 struct ceph_inode_info *ci = ceph_inode(dir); 472 struct ceph_dentry_info *di = ceph_dentry(dentry); 473 int got = 0, want = CEPH_CAP_FILE_EXCL | CEPH_CAP_DIR_CREATE; 474 u64 ino; 475 476 spin_lock(&ci->i_ceph_lock); 477 /* No auth cap means no chance for Dc caps */ 478 if (!ci->i_auth_cap) 479 goto no_async; 480 481 /* Any delegated inos? */ 482 if (xa_empty(&ci->i_auth_cap->session->s_delegated_inos)) 483 goto no_async; 484 485 if (!ceph_file_layout_is_valid(&ci->i_cached_layout)) 486 goto no_async; 487 488 if ((__ceph_caps_issued(ci, NULL) & want) != want) 489 goto no_async; 490 491 if (d_in_lookup(dentry)) { 492 if (!__ceph_dir_is_complete(ci)) 493 goto no_async; 494 spin_lock(&dentry->d_lock); 495 di->lease_shared_gen = atomic_read(&ci->i_shared_gen); 496 spin_unlock(&dentry->d_lock); 497 } else if (atomic_read(&ci->i_shared_gen) != 498 READ_ONCE(di->lease_shared_gen)) { 499 goto no_async; 500 } 501 502 ino = ceph_get_deleg_ino(ci->i_auth_cap->session); 503 if (!ino) 504 goto no_async; 505 506 *pino = ino; 507 ceph_take_cap_refs(ci, want, false); 508 memcpy(lo, &ci->i_cached_layout, sizeof(*lo)); 509 rcu_assign_pointer(lo->pool_ns, 510 ceph_try_get_string(ci->i_cached_layout.pool_ns)); 511 got = want; 512 no_async: 513 spin_unlock(&ci->i_ceph_lock); 514 return got; 515 } 516 517 static void restore_deleg_ino(struct inode *dir, u64 ino) 518 { 519 struct ceph_inode_info *ci = ceph_inode(dir); 520 struct ceph_mds_session *s = NULL; 521 522 spin_lock(&ci->i_ceph_lock); 523 if (ci->i_auth_cap) 524 s = ceph_get_mds_session(ci->i_auth_cap->session); 525 spin_unlock(&ci->i_ceph_lock); 526 if (s) { 527 int err = ceph_restore_deleg_ino(s, ino); 528 if (err) 529 pr_warn("ceph: unable to restore delegated ino 0x%llx to session: %d\n", 530 ino, err); 531 ceph_put_mds_session(s); 532 } 533 } 534 535 static void wake_async_create_waiters(struct inode *inode, 536 struct ceph_mds_session *session) 537 { 538 struct ceph_inode_info *ci = ceph_inode(inode); 539 540 spin_lock(&ci->i_ceph_lock); 541 if (ci->i_ceph_flags & CEPH_I_ASYNC_CREATE) { 542 ci->i_ceph_flags &= ~CEPH_I_ASYNC_CREATE; 543 wake_up_bit(&ci->i_ceph_flags, CEPH_ASYNC_CREATE_BIT); 544 } 545 ceph_kick_flushing_inode_caps(session, ci); 546 spin_unlock(&ci->i_ceph_lock); 547 } 548 549 static void ceph_async_create_cb(struct ceph_mds_client *mdsc, 550 struct ceph_mds_request *req) 551 { 552 struct dentry *dentry = req->r_dentry; 553 struct inode *dinode = d_inode(dentry); 554 struct inode *tinode = req->r_target_inode; 555 int result = req->r_err ? req->r_err : 556 le32_to_cpu(req->r_reply_info.head->result); 557 558 WARN_ON_ONCE(dinode && tinode && dinode != tinode); 559 560 /* MDS changed -- caller must resubmit */ 561 if (result == -EJUKEBOX) 562 goto out; 563 564 mapping_set_error(req->r_parent->i_mapping, result); 565 566 if (result) { 567 int pathlen = 0; 568 u64 base = 0; 569 char *path = ceph_mdsc_build_path(req->r_dentry, &pathlen, 570 &base, 0); 571 572 pr_warn("ceph: async create failure path=(%llx)%s result=%d!\n", 573 base, IS_ERR(path) ? "<<bad>>" : path, result); 574 ceph_mdsc_free_path(path, pathlen); 575 576 ceph_dir_clear_complete(req->r_parent); 577 if (!d_unhashed(dentry)) 578 d_drop(dentry); 579 580 if (dinode) { 581 mapping_set_error(dinode->i_mapping, result); 582 ceph_inode_shutdown(dinode); 583 wake_async_create_waiters(dinode, req->r_session); 584 } 585 } 586 587 if (tinode) { 588 u64 ino = ceph_vino(tinode).ino; 589 590 if (req->r_deleg_ino != ino) 591 pr_warn("%s: inode number mismatch! err=%d deleg_ino=0x%llx target=0x%llx\n", 592 __func__, req->r_err, req->r_deleg_ino, ino); 593 594 mapping_set_error(tinode->i_mapping, result); 595 wake_async_create_waiters(tinode, req->r_session); 596 } else if (!result) { 597 pr_warn("%s: no req->r_target_inode for 0x%llx\n", __func__, 598 req->r_deleg_ino); 599 } 600 out: 601 ceph_mdsc_release_dir_caps(req); 602 } 603 604 static int ceph_finish_async_create(struct inode *dir, struct dentry *dentry, 605 struct file *file, umode_t mode, 606 struct ceph_mds_request *req, 607 struct ceph_acl_sec_ctx *as_ctx, 608 struct ceph_file_layout *lo) 609 { 610 int ret; 611 char xattr_buf[4]; 612 struct ceph_mds_reply_inode in = { }; 613 struct ceph_mds_reply_info_in iinfo = { .in = &in }; 614 struct ceph_inode_info *ci = ceph_inode(dir); 615 struct inode *inode; 616 struct timespec64 now; 617 struct ceph_string *pool_ns; 618 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb); 619 struct ceph_vino vino = { .ino = req->r_deleg_ino, 620 .snap = CEPH_NOSNAP }; 621 622 ktime_get_real_ts64(&now); 623 624 inode = ceph_get_inode(dentry->d_sb, vino); 625 if (IS_ERR(inode)) 626 return PTR_ERR(inode); 627 628 iinfo.inline_version = CEPH_INLINE_NONE; 629 iinfo.change_attr = 1; 630 ceph_encode_timespec64(&iinfo.btime, &now); 631 632 iinfo.xattr_len = ARRAY_SIZE(xattr_buf); 633 iinfo.xattr_data = xattr_buf; 634 memset(iinfo.xattr_data, 0, iinfo.xattr_len); 635 636 in.ino = cpu_to_le64(vino.ino); 637 in.snapid = cpu_to_le64(CEPH_NOSNAP); 638 in.version = cpu_to_le64(1); // ??? 639 in.cap.caps = in.cap.wanted = cpu_to_le32(CEPH_CAP_ALL_FILE); 640 in.cap.cap_id = cpu_to_le64(1); 641 in.cap.realm = cpu_to_le64(ci->i_snap_realm->ino); 642 in.cap.flags = CEPH_CAP_FLAG_AUTH; 643 in.ctime = in.mtime = in.atime = iinfo.btime; 644 in.truncate_seq = cpu_to_le32(1); 645 in.truncate_size = cpu_to_le64(-1ULL); 646 in.xattr_version = cpu_to_le64(1); 647 in.uid = cpu_to_le32(from_kuid(&init_user_ns, current_fsuid())); 648 if (dir->i_mode & S_ISGID) { 649 in.gid = cpu_to_le32(from_kgid(&init_user_ns, dir->i_gid)); 650 651 /* Directories always inherit the setgid bit. */ 652 if (S_ISDIR(mode)) 653 mode |= S_ISGID; 654 else if ((mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP) && 655 !in_group_p(dir->i_gid) && 656 !capable_wrt_inode_uidgid(&init_user_ns, dir, CAP_FSETID)) 657 mode &= ~S_ISGID; 658 } else { 659 in.gid = cpu_to_le32(from_kgid(&init_user_ns, current_fsgid())); 660 } 661 in.mode = cpu_to_le32((u32)mode); 662 663 in.nlink = cpu_to_le32(1); 664 in.max_size = cpu_to_le64(lo->stripe_unit); 665 666 ceph_file_layout_to_legacy(lo, &in.layout); 667 /* lo is private, so pool_ns can't change */ 668 pool_ns = rcu_dereference_raw(lo->pool_ns); 669 if (pool_ns) { 670 iinfo.pool_ns_len = pool_ns->len; 671 iinfo.pool_ns_data = pool_ns->str; 672 } 673 674 down_read(&mdsc->snap_rwsem); 675 ret = ceph_fill_inode(inode, NULL, &iinfo, NULL, req->r_session, 676 req->r_fmode, NULL); 677 up_read(&mdsc->snap_rwsem); 678 if (ret) { 679 dout("%s failed to fill inode: %d\n", __func__, ret); 680 ceph_dir_clear_complete(dir); 681 if (!d_unhashed(dentry)) 682 d_drop(dentry); 683 if (inode->i_state & I_NEW) 684 discard_new_inode(inode); 685 } else { 686 struct dentry *dn; 687 688 dout("%s d_adding new inode 0x%llx to 0x%llx/%s\n", __func__, 689 vino.ino, ceph_ino(dir), dentry->d_name.name); 690 ceph_dir_clear_ordered(dir); 691 ceph_init_inode_acls(inode, as_ctx); 692 if (inode->i_state & I_NEW) { 693 /* 694 * If it's not I_NEW, then someone created this before 695 * we got here. Assume the server is aware of it at 696 * that point and don't worry about setting 697 * CEPH_I_ASYNC_CREATE. 698 */ 699 ceph_inode(inode)->i_ceph_flags = CEPH_I_ASYNC_CREATE; 700 unlock_new_inode(inode); 701 } 702 if (d_in_lookup(dentry) || d_really_is_negative(dentry)) { 703 if (!d_unhashed(dentry)) 704 d_drop(dentry); 705 dn = d_splice_alias(inode, dentry); 706 WARN_ON_ONCE(dn && dn != dentry); 707 } 708 file->f_mode |= FMODE_CREATED; 709 ret = finish_open(file, dentry, ceph_open); 710 } 711 return ret; 712 } 713 714 /* 715 * Do a lookup + open with a single request. If we get a non-existent 716 * file or symlink, return 1 so the VFS can retry. 717 */ 718 int ceph_atomic_open(struct inode *dir, struct dentry *dentry, 719 struct file *file, unsigned flags, umode_t mode) 720 { 721 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); 722 struct ceph_mds_client *mdsc = fsc->mdsc; 723 struct ceph_mds_request *req; 724 struct dentry *dn; 725 struct ceph_acl_sec_ctx as_ctx = {}; 726 bool try_async = ceph_test_mount_opt(fsc, ASYNC_DIROPS); 727 int mask; 728 int err; 729 730 dout("atomic_open %p dentry %p '%pd' %s flags %d mode 0%o\n", 731 dir, dentry, dentry, 732 d_unhashed(dentry) ? "unhashed" : "hashed", flags, mode); 733 734 if (dentry->d_name.len > NAME_MAX) 735 return -ENAMETOOLONG; 736 737 if (flags & O_CREAT) { 738 if (ceph_quota_is_max_files_exceeded(dir)) 739 return -EDQUOT; 740 err = ceph_pre_init_acls(dir, &mode, &as_ctx); 741 if (err < 0) 742 return err; 743 err = ceph_security_init_secctx(dentry, mode, &as_ctx); 744 if (err < 0) 745 goto out_ctx; 746 } else if (!d_in_lookup(dentry)) { 747 /* If it's not being looked up, it's negative */ 748 return -ENOENT; 749 } 750 retry: 751 /* do the open */ 752 req = prepare_open_request(dir->i_sb, flags, mode); 753 if (IS_ERR(req)) { 754 err = PTR_ERR(req); 755 goto out_ctx; 756 } 757 req->r_dentry = dget(dentry); 758 req->r_num_caps = 2; 759 mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED; 760 if (ceph_security_xattr_wanted(dir)) 761 mask |= CEPH_CAP_XATTR_SHARED; 762 req->r_args.open.mask = cpu_to_le32(mask); 763 req->r_parent = dir; 764 ihold(dir); 765 766 if (flags & O_CREAT) { 767 struct ceph_file_layout lo; 768 769 req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL; 770 req->r_dentry_unless = CEPH_CAP_FILE_EXCL; 771 if (as_ctx.pagelist) { 772 req->r_pagelist = as_ctx.pagelist; 773 as_ctx.pagelist = NULL; 774 } 775 if (try_async && 776 (req->r_dir_caps = 777 try_prep_async_create(dir, dentry, &lo, 778 &req->r_deleg_ino))) { 779 set_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags); 780 req->r_args.open.flags |= cpu_to_le32(CEPH_O_EXCL); 781 req->r_callback = ceph_async_create_cb; 782 err = ceph_mdsc_submit_request(mdsc, dir, req); 783 if (!err) { 784 err = ceph_finish_async_create(dir, dentry, 785 file, mode, req, 786 &as_ctx, &lo); 787 } else if (err == -EJUKEBOX) { 788 restore_deleg_ino(dir, req->r_deleg_ino); 789 ceph_mdsc_put_request(req); 790 try_async = false; 791 ceph_put_string(rcu_dereference_raw(lo.pool_ns)); 792 goto retry; 793 } 794 ceph_put_string(rcu_dereference_raw(lo.pool_ns)); 795 goto out_req; 796 } 797 } 798 799 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); 800 err = ceph_mdsc_do_request(mdsc, 801 (flags & (O_CREAT|O_TRUNC)) ? dir : NULL, 802 req); 803 if (err == -ENOENT) { 804 dentry = ceph_handle_snapdir(req, dentry); 805 if (IS_ERR(dentry)) { 806 err = PTR_ERR(dentry); 807 goto out_req; 808 } 809 err = 0; 810 } 811 812 if (!err && (flags & O_CREAT) && !req->r_reply_info.head->is_dentry) 813 err = ceph_handle_notrace_create(dir, dentry); 814 815 if (d_in_lookup(dentry)) { 816 dn = ceph_finish_lookup(req, dentry, err); 817 if (IS_ERR(dn)) 818 err = PTR_ERR(dn); 819 } else { 820 /* we were given a hashed negative dentry */ 821 dn = NULL; 822 } 823 if (err) 824 goto out_req; 825 if (dn || d_really_is_negative(dentry) || d_is_symlink(dentry)) { 826 /* make vfs retry on splice, ENOENT, or symlink */ 827 dout("atomic_open finish_no_open on dn %p\n", dn); 828 err = finish_no_open(file, dn); 829 } else { 830 dout("atomic_open finish_open on dn %p\n", dn); 831 if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) { 832 struct inode *newino = d_inode(dentry); 833 834 cache_file_layout(dir, newino); 835 ceph_init_inode_acls(newino, &as_ctx); 836 file->f_mode |= FMODE_CREATED; 837 } 838 err = finish_open(file, dentry, ceph_open); 839 } 840 out_req: 841 ceph_mdsc_put_request(req); 842 out_ctx: 843 ceph_release_acl_sec_ctx(&as_ctx); 844 dout("atomic_open result=%d\n", err); 845 return err; 846 } 847 848 int ceph_release(struct inode *inode, struct file *file) 849 { 850 struct ceph_inode_info *ci = ceph_inode(inode); 851 852 if (S_ISDIR(inode->i_mode)) { 853 struct ceph_dir_file_info *dfi = file->private_data; 854 dout("release inode %p dir file %p\n", inode, file); 855 WARN_ON(!list_empty(&dfi->file_info.rw_contexts)); 856 857 ceph_put_fmode(ci, dfi->file_info.fmode, 1); 858 859 if (dfi->last_readdir) 860 ceph_mdsc_put_request(dfi->last_readdir); 861 kfree(dfi->last_name); 862 kfree(dfi->dir_info); 863 kmem_cache_free(ceph_dir_file_cachep, dfi); 864 } else { 865 struct ceph_file_info *fi = file->private_data; 866 dout("release inode %p regular file %p\n", inode, file); 867 WARN_ON(!list_empty(&fi->rw_contexts)); 868 869 ceph_fscache_unuse_cookie(inode, file->f_mode & FMODE_WRITE); 870 ceph_put_fmode(ci, fi->fmode, 1); 871 872 kmem_cache_free(ceph_file_cachep, fi); 873 } 874 875 /* wake up anyone waiting for caps on this inode */ 876 wake_up_all(&ci->i_cap_wq); 877 return 0; 878 } 879 880 enum { 881 HAVE_RETRIED = 1, 882 CHECK_EOF = 2, 883 READ_INLINE = 3, 884 }; 885 886 /* 887 * Completely synchronous read and write methods. Direct from __user 888 * buffer to osd, or directly to user pages (if O_DIRECT). 889 * 890 * If the read spans object boundary, just do multiple reads. (That's not 891 * atomic, but good enough for now.) 892 * 893 * If we get a short result from the OSD, check against i_size; we need to 894 * only return a short read to the caller if we hit EOF. 895 */ 896 static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *to, 897 int *retry_op) 898 { 899 struct file *file = iocb->ki_filp; 900 struct inode *inode = file_inode(file); 901 struct ceph_inode_info *ci = ceph_inode(inode); 902 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 903 struct ceph_osd_client *osdc = &fsc->client->osdc; 904 ssize_t ret; 905 u64 off = iocb->ki_pos; 906 u64 len = iov_iter_count(to); 907 u64 i_size = i_size_read(inode); 908 909 dout("sync_read on file %p %llu~%u %s\n", file, off, (unsigned)len, 910 (file->f_flags & O_DIRECT) ? "O_DIRECT" : ""); 911 912 if (!len) 913 return 0; 914 /* 915 * flush any page cache pages in this range. this 916 * will make concurrent normal and sync io slow, 917 * but it will at least behave sensibly when they are 918 * in sequence. 919 */ 920 ret = filemap_write_and_wait_range(inode->i_mapping, 921 off, off + len - 1); 922 if (ret < 0) 923 return ret; 924 925 ret = 0; 926 while ((len = iov_iter_count(to)) > 0) { 927 struct ceph_osd_request *req; 928 struct page **pages; 929 int num_pages; 930 size_t page_off; 931 bool more; 932 int idx; 933 size_t left; 934 935 req = ceph_osdc_new_request(osdc, &ci->i_layout, 936 ci->i_vino, off, &len, 0, 1, 937 CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ, 938 NULL, ci->i_truncate_seq, 939 ci->i_truncate_size, false); 940 if (IS_ERR(req)) { 941 ret = PTR_ERR(req); 942 break; 943 } 944 945 more = len < iov_iter_count(to); 946 947 num_pages = calc_pages_for(off, len); 948 page_off = off & ~PAGE_MASK; 949 pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL); 950 if (IS_ERR(pages)) { 951 ceph_osdc_put_request(req); 952 ret = PTR_ERR(pages); 953 break; 954 } 955 956 osd_req_op_extent_osd_data_pages(req, 0, pages, len, page_off, 957 false, false); 958 ret = ceph_osdc_start_request(osdc, req, false); 959 if (!ret) 960 ret = ceph_osdc_wait_request(osdc, req); 961 962 ceph_update_read_metrics(&fsc->mdsc->metric, 963 req->r_start_latency, 964 req->r_end_latency, 965 len, ret); 966 967 ceph_osdc_put_request(req); 968 969 i_size = i_size_read(inode); 970 dout("sync_read %llu~%llu got %zd i_size %llu%s\n", 971 off, len, ret, i_size, (more ? " MORE" : "")); 972 973 if (ret == -ENOENT) 974 ret = 0; 975 if (ret >= 0 && ret < len && (off + ret < i_size)) { 976 int zlen = min(len - ret, i_size - off - ret); 977 int zoff = page_off + ret; 978 dout("sync_read zero gap %llu~%llu\n", 979 off + ret, off + ret + zlen); 980 ceph_zero_page_vector_range(zoff, zlen, pages); 981 ret += zlen; 982 } 983 984 idx = 0; 985 left = ret > 0 ? ret : 0; 986 while (left > 0) { 987 size_t len, copied; 988 page_off = off & ~PAGE_MASK; 989 len = min_t(size_t, left, PAGE_SIZE - page_off); 990 SetPageUptodate(pages[idx]); 991 copied = copy_page_to_iter(pages[idx++], 992 page_off, len, to); 993 off += copied; 994 left -= copied; 995 if (copied < len) { 996 ret = -EFAULT; 997 break; 998 } 999 } 1000 ceph_release_page_vector(pages, num_pages); 1001 1002 if (ret < 0) { 1003 if (ret == -EBLOCKLISTED) 1004 fsc->blocklisted = true; 1005 break; 1006 } 1007 1008 if (off >= i_size || !more) 1009 break; 1010 } 1011 1012 if (off > iocb->ki_pos) { 1013 if (off >= i_size) { 1014 *retry_op = CHECK_EOF; 1015 ret = i_size - iocb->ki_pos; 1016 iocb->ki_pos = i_size; 1017 } else { 1018 ret = off - iocb->ki_pos; 1019 iocb->ki_pos = off; 1020 } 1021 } 1022 1023 dout("sync_read result %zd retry_op %d\n", ret, *retry_op); 1024 return ret; 1025 } 1026 1027 struct ceph_aio_request { 1028 struct kiocb *iocb; 1029 size_t total_len; 1030 bool write; 1031 bool should_dirty; 1032 int error; 1033 struct list_head osd_reqs; 1034 unsigned num_reqs; 1035 atomic_t pending_reqs; 1036 struct timespec64 mtime; 1037 struct ceph_cap_flush *prealloc_cf; 1038 }; 1039 1040 struct ceph_aio_work { 1041 struct work_struct work; 1042 struct ceph_osd_request *req; 1043 }; 1044 1045 static void ceph_aio_retry_work(struct work_struct *work); 1046 1047 static void ceph_aio_complete(struct inode *inode, 1048 struct ceph_aio_request *aio_req) 1049 { 1050 struct ceph_inode_info *ci = ceph_inode(inode); 1051 int ret; 1052 1053 if (!atomic_dec_and_test(&aio_req->pending_reqs)) 1054 return; 1055 1056 if (aio_req->iocb->ki_flags & IOCB_DIRECT) 1057 inode_dio_end(inode); 1058 1059 ret = aio_req->error; 1060 if (!ret) 1061 ret = aio_req->total_len; 1062 1063 dout("ceph_aio_complete %p rc %d\n", inode, ret); 1064 1065 if (ret >= 0 && aio_req->write) { 1066 int dirty; 1067 1068 loff_t endoff = aio_req->iocb->ki_pos + aio_req->total_len; 1069 if (endoff > i_size_read(inode)) { 1070 if (ceph_inode_set_size(inode, endoff)) 1071 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL); 1072 } 1073 1074 spin_lock(&ci->i_ceph_lock); 1075 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR, 1076 &aio_req->prealloc_cf); 1077 spin_unlock(&ci->i_ceph_lock); 1078 if (dirty) 1079 __mark_inode_dirty(inode, dirty); 1080 1081 } 1082 1083 ceph_put_cap_refs(ci, (aio_req->write ? CEPH_CAP_FILE_WR : 1084 CEPH_CAP_FILE_RD)); 1085 1086 aio_req->iocb->ki_complete(aio_req->iocb, ret); 1087 1088 ceph_free_cap_flush(aio_req->prealloc_cf); 1089 kfree(aio_req); 1090 } 1091 1092 static void ceph_aio_complete_req(struct ceph_osd_request *req) 1093 { 1094 int rc = req->r_result; 1095 struct inode *inode = req->r_inode; 1096 struct ceph_aio_request *aio_req = req->r_priv; 1097 struct ceph_osd_data *osd_data = osd_req_op_extent_osd_data(req, 0); 1098 struct ceph_client_metric *metric = &ceph_sb_to_mdsc(inode->i_sb)->metric; 1099 unsigned int len = osd_data->bvec_pos.iter.bi_size; 1100 1101 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_BVECS); 1102 BUG_ON(!osd_data->num_bvecs); 1103 1104 dout("ceph_aio_complete_req %p rc %d bytes %u\n", inode, rc, len); 1105 1106 if (rc == -EOLDSNAPC) { 1107 struct ceph_aio_work *aio_work; 1108 BUG_ON(!aio_req->write); 1109 1110 aio_work = kmalloc(sizeof(*aio_work), GFP_NOFS); 1111 if (aio_work) { 1112 INIT_WORK(&aio_work->work, ceph_aio_retry_work); 1113 aio_work->req = req; 1114 queue_work(ceph_inode_to_client(inode)->inode_wq, 1115 &aio_work->work); 1116 return; 1117 } 1118 rc = -ENOMEM; 1119 } else if (!aio_req->write) { 1120 if (rc == -ENOENT) 1121 rc = 0; 1122 if (rc >= 0 && len > rc) { 1123 struct iov_iter i; 1124 int zlen = len - rc; 1125 1126 /* 1127 * If read is satisfied by single OSD request, 1128 * it can pass EOF. Otherwise read is within 1129 * i_size. 1130 */ 1131 if (aio_req->num_reqs == 1) { 1132 loff_t i_size = i_size_read(inode); 1133 loff_t endoff = aio_req->iocb->ki_pos + rc; 1134 if (endoff < i_size) 1135 zlen = min_t(size_t, zlen, 1136 i_size - endoff); 1137 aio_req->total_len = rc + zlen; 1138 } 1139 1140 iov_iter_bvec(&i, READ, osd_data->bvec_pos.bvecs, 1141 osd_data->num_bvecs, len); 1142 iov_iter_advance(&i, rc); 1143 iov_iter_zero(zlen, &i); 1144 } 1145 } 1146 1147 /* r_start_latency == 0 means the request was not submitted */ 1148 if (req->r_start_latency) { 1149 if (aio_req->write) 1150 ceph_update_write_metrics(metric, req->r_start_latency, 1151 req->r_end_latency, len, rc); 1152 else 1153 ceph_update_read_metrics(metric, req->r_start_latency, 1154 req->r_end_latency, len, rc); 1155 } 1156 1157 put_bvecs(osd_data->bvec_pos.bvecs, osd_data->num_bvecs, 1158 aio_req->should_dirty); 1159 ceph_osdc_put_request(req); 1160 1161 if (rc < 0) 1162 cmpxchg(&aio_req->error, 0, rc); 1163 1164 ceph_aio_complete(inode, aio_req); 1165 return; 1166 } 1167 1168 static void ceph_aio_retry_work(struct work_struct *work) 1169 { 1170 struct ceph_aio_work *aio_work = 1171 container_of(work, struct ceph_aio_work, work); 1172 struct ceph_osd_request *orig_req = aio_work->req; 1173 struct ceph_aio_request *aio_req = orig_req->r_priv; 1174 struct inode *inode = orig_req->r_inode; 1175 struct ceph_inode_info *ci = ceph_inode(inode); 1176 struct ceph_snap_context *snapc; 1177 struct ceph_osd_request *req; 1178 int ret; 1179 1180 spin_lock(&ci->i_ceph_lock); 1181 if (__ceph_have_pending_cap_snap(ci)) { 1182 struct ceph_cap_snap *capsnap = 1183 list_last_entry(&ci->i_cap_snaps, 1184 struct ceph_cap_snap, 1185 ci_item); 1186 snapc = ceph_get_snap_context(capsnap->context); 1187 } else { 1188 BUG_ON(!ci->i_head_snapc); 1189 snapc = ceph_get_snap_context(ci->i_head_snapc); 1190 } 1191 spin_unlock(&ci->i_ceph_lock); 1192 1193 req = ceph_osdc_alloc_request(orig_req->r_osdc, snapc, 1, 1194 false, GFP_NOFS); 1195 if (!req) { 1196 ret = -ENOMEM; 1197 req = orig_req; 1198 goto out; 1199 } 1200 1201 req->r_flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE; 1202 ceph_oloc_copy(&req->r_base_oloc, &orig_req->r_base_oloc); 1203 ceph_oid_copy(&req->r_base_oid, &orig_req->r_base_oid); 1204 1205 req->r_ops[0] = orig_req->r_ops[0]; 1206 1207 req->r_mtime = aio_req->mtime; 1208 req->r_data_offset = req->r_ops[0].extent.offset; 1209 1210 ret = ceph_osdc_alloc_messages(req, GFP_NOFS); 1211 if (ret) { 1212 ceph_osdc_put_request(req); 1213 req = orig_req; 1214 goto out; 1215 } 1216 1217 ceph_osdc_put_request(orig_req); 1218 1219 req->r_callback = ceph_aio_complete_req; 1220 req->r_inode = inode; 1221 req->r_priv = aio_req; 1222 1223 ret = ceph_osdc_start_request(req->r_osdc, req, false); 1224 out: 1225 if (ret < 0) { 1226 req->r_result = ret; 1227 ceph_aio_complete_req(req); 1228 } 1229 1230 ceph_put_snap_context(snapc); 1231 kfree(aio_work); 1232 } 1233 1234 static ssize_t 1235 ceph_direct_read_write(struct kiocb *iocb, struct iov_iter *iter, 1236 struct ceph_snap_context *snapc, 1237 struct ceph_cap_flush **pcf) 1238 { 1239 struct file *file = iocb->ki_filp; 1240 struct inode *inode = file_inode(file); 1241 struct ceph_inode_info *ci = ceph_inode(inode); 1242 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 1243 struct ceph_client_metric *metric = &fsc->mdsc->metric; 1244 struct ceph_vino vino; 1245 struct ceph_osd_request *req; 1246 struct bio_vec *bvecs; 1247 struct ceph_aio_request *aio_req = NULL; 1248 int num_pages = 0; 1249 int flags; 1250 int ret = 0; 1251 struct timespec64 mtime = current_time(inode); 1252 size_t count = iov_iter_count(iter); 1253 loff_t pos = iocb->ki_pos; 1254 bool write = iov_iter_rw(iter) == WRITE; 1255 bool should_dirty = !write && iter_is_iovec(iter); 1256 1257 if (write && ceph_snap(file_inode(file)) != CEPH_NOSNAP) 1258 return -EROFS; 1259 1260 dout("sync_direct_%s on file %p %lld~%u snapc %p seq %lld\n", 1261 (write ? "write" : "read"), file, pos, (unsigned)count, 1262 snapc, snapc ? snapc->seq : 0); 1263 1264 if (write) { 1265 int ret2; 1266 1267 ceph_fscache_invalidate(inode, true); 1268 1269 ret2 = invalidate_inode_pages2_range(inode->i_mapping, 1270 pos >> PAGE_SHIFT, 1271 (pos + count - 1) >> PAGE_SHIFT); 1272 if (ret2 < 0) 1273 dout("invalidate_inode_pages2_range returned %d\n", ret2); 1274 1275 flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE; 1276 } else { 1277 flags = CEPH_OSD_FLAG_READ; 1278 } 1279 1280 while (iov_iter_count(iter) > 0) { 1281 u64 size = iov_iter_count(iter); 1282 ssize_t len; 1283 1284 if (write) 1285 size = min_t(u64, size, fsc->mount_options->wsize); 1286 else 1287 size = min_t(u64, size, fsc->mount_options->rsize); 1288 1289 vino = ceph_vino(inode); 1290 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, 1291 vino, pos, &size, 0, 1292 1, 1293 write ? CEPH_OSD_OP_WRITE : 1294 CEPH_OSD_OP_READ, 1295 flags, snapc, 1296 ci->i_truncate_seq, 1297 ci->i_truncate_size, 1298 false); 1299 if (IS_ERR(req)) { 1300 ret = PTR_ERR(req); 1301 break; 1302 } 1303 1304 len = iter_get_bvecs_alloc(iter, size, &bvecs, &num_pages); 1305 if (len < 0) { 1306 ceph_osdc_put_request(req); 1307 ret = len; 1308 break; 1309 } 1310 if (len != size) 1311 osd_req_op_extent_update(req, 0, len); 1312 1313 /* 1314 * To simplify error handling, allow AIO when IO within i_size 1315 * or IO can be satisfied by single OSD request. 1316 */ 1317 if (pos == iocb->ki_pos && !is_sync_kiocb(iocb) && 1318 (len == count || pos + count <= i_size_read(inode))) { 1319 aio_req = kzalloc(sizeof(*aio_req), GFP_KERNEL); 1320 if (aio_req) { 1321 aio_req->iocb = iocb; 1322 aio_req->write = write; 1323 aio_req->should_dirty = should_dirty; 1324 INIT_LIST_HEAD(&aio_req->osd_reqs); 1325 if (write) { 1326 aio_req->mtime = mtime; 1327 swap(aio_req->prealloc_cf, *pcf); 1328 } 1329 } 1330 /* ignore error */ 1331 } 1332 1333 if (write) { 1334 /* 1335 * throw out any page cache pages in this range. this 1336 * may block. 1337 */ 1338 truncate_inode_pages_range(inode->i_mapping, pos, 1339 PAGE_ALIGN(pos + len) - 1); 1340 1341 req->r_mtime = mtime; 1342 } 1343 1344 osd_req_op_extent_osd_data_bvecs(req, 0, bvecs, num_pages, len); 1345 1346 if (aio_req) { 1347 aio_req->total_len += len; 1348 aio_req->num_reqs++; 1349 atomic_inc(&aio_req->pending_reqs); 1350 1351 req->r_callback = ceph_aio_complete_req; 1352 req->r_inode = inode; 1353 req->r_priv = aio_req; 1354 list_add_tail(&req->r_private_item, &aio_req->osd_reqs); 1355 1356 pos += len; 1357 continue; 1358 } 1359 1360 ret = ceph_osdc_start_request(req->r_osdc, req, false); 1361 if (!ret) 1362 ret = ceph_osdc_wait_request(&fsc->client->osdc, req); 1363 1364 if (write) 1365 ceph_update_write_metrics(metric, req->r_start_latency, 1366 req->r_end_latency, len, ret); 1367 else 1368 ceph_update_read_metrics(metric, req->r_start_latency, 1369 req->r_end_latency, len, ret); 1370 1371 size = i_size_read(inode); 1372 if (!write) { 1373 if (ret == -ENOENT) 1374 ret = 0; 1375 if (ret >= 0 && ret < len && pos + ret < size) { 1376 struct iov_iter i; 1377 int zlen = min_t(size_t, len - ret, 1378 size - pos - ret); 1379 1380 iov_iter_bvec(&i, READ, bvecs, num_pages, len); 1381 iov_iter_advance(&i, ret); 1382 iov_iter_zero(zlen, &i); 1383 ret += zlen; 1384 } 1385 if (ret >= 0) 1386 len = ret; 1387 } 1388 1389 put_bvecs(bvecs, num_pages, should_dirty); 1390 ceph_osdc_put_request(req); 1391 if (ret < 0) 1392 break; 1393 1394 pos += len; 1395 if (!write && pos >= size) 1396 break; 1397 1398 if (write && pos > size) { 1399 if (ceph_inode_set_size(inode, pos)) 1400 ceph_check_caps(ceph_inode(inode), 1401 CHECK_CAPS_AUTHONLY, 1402 NULL); 1403 } 1404 } 1405 1406 if (aio_req) { 1407 LIST_HEAD(osd_reqs); 1408 1409 if (aio_req->num_reqs == 0) { 1410 kfree(aio_req); 1411 return ret; 1412 } 1413 1414 ceph_get_cap_refs(ci, write ? CEPH_CAP_FILE_WR : 1415 CEPH_CAP_FILE_RD); 1416 1417 list_splice(&aio_req->osd_reqs, &osd_reqs); 1418 inode_dio_begin(inode); 1419 while (!list_empty(&osd_reqs)) { 1420 req = list_first_entry(&osd_reqs, 1421 struct ceph_osd_request, 1422 r_private_item); 1423 list_del_init(&req->r_private_item); 1424 if (ret >= 0) 1425 ret = ceph_osdc_start_request(req->r_osdc, 1426 req, false); 1427 if (ret < 0) { 1428 req->r_result = ret; 1429 ceph_aio_complete_req(req); 1430 } 1431 } 1432 return -EIOCBQUEUED; 1433 } 1434 1435 if (ret != -EOLDSNAPC && pos > iocb->ki_pos) { 1436 ret = pos - iocb->ki_pos; 1437 iocb->ki_pos = pos; 1438 } 1439 return ret; 1440 } 1441 1442 /* 1443 * Synchronous write, straight from __user pointer or user pages. 1444 * 1445 * If write spans object boundary, just do multiple writes. (For a 1446 * correct atomic write, we should e.g. take write locks on all 1447 * objects, rollback on failure, etc.) 1448 */ 1449 static ssize_t 1450 ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos, 1451 struct ceph_snap_context *snapc) 1452 { 1453 struct file *file = iocb->ki_filp; 1454 struct inode *inode = file_inode(file); 1455 struct ceph_inode_info *ci = ceph_inode(inode); 1456 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 1457 struct ceph_vino vino; 1458 struct ceph_osd_request *req; 1459 struct page **pages; 1460 u64 len; 1461 int num_pages; 1462 int written = 0; 1463 int flags; 1464 int ret; 1465 bool check_caps = false; 1466 struct timespec64 mtime = current_time(inode); 1467 size_t count = iov_iter_count(from); 1468 1469 if (ceph_snap(file_inode(file)) != CEPH_NOSNAP) 1470 return -EROFS; 1471 1472 dout("sync_write on file %p %lld~%u snapc %p seq %lld\n", 1473 file, pos, (unsigned)count, snapc, snapc->seq); 1474 1475 ret = filemap_write_and_wait_range(inode->i_mapping, 1476 pos, pos + count - 1); 1477 if (ret < 0) 1478 return ret; 1479 1480 ceph_fscache_invalidate(inode, false); 1481 ret = invalidate_inode_pages2_range(inode->i_mapping, 1482 pos >> PAGE_SHIFT, 1483 (pos + count - 1) >> PAGE_SHIFT); 1484 if (ret < 0) 1485 dout("invalidate_inode_pages2_range returned %d\n", ret); 1486 1487 flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE; 1488 1489 while ((len = iov_iter_count(from)) > 0) { 1490 size_t left; 1491 int n; 1492 1493 vino = ceph_vino(inode); 1494 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, 1495 vino, pos, &len, 0, 1, 1496 CEPH_OSD_OP_WRITE, flags, snapc, 1497 ci->i_truncate_seq, 1498 ci->i_truncate_size, 1499 false); 1500 if (IS_ERR(req)) { 1501 ret = PTR_ERR(req); 1502 break; 1503 } 1504 1505 /* 1506 * write from beginning of first page, 1507 * regardless of io alignment 1508 */ 1509 num_pages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; 1510 1511 pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL); 1512 if (IS_ERR(pages)) { 1513 ret = PTR_ERR(pages); 1514 goto out; 1515 } 1516 1517 left = len; 1518 for (n = 0; n < num_pages; n++) { 1519 size_t plen = min_t(size_t, left, PAGE_SIZE); 1520 ret = copy_page_from_iter(pages[n], 0, plen, from); 1521 if (ret != plen) { 1522 ret = -EFAULT; 1523 break; 1524 } 1525 left -= ret; 1526 } 1527 1528 if (ret < 0) { 1529 ceph_release_page_vector(pages, num_pages); 1530 goto out; 1531 } 1532 1533 req->r_inode = inode; 1534 1535 osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, 1536 false, true); 1537 1538 req->r_mtime = mtime; 1539 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false); 1540 if (!ret) 1541 ret = ceph_osdc_wait_request(&fsc->client->osdc, req); 1542 1543 ceph_update_write_metrics(&fsc->mdsc->metric, req->r_start_latency, 1544 req->r_end_latency, len, ret); 1545 out: 1546 ceph_osdc_put_request(req); 1547 if (ret != 0) { 1548 ceph_set_error_write(ci); 1549 break; 1550 } 1551 1552 ceph_clear_error_write(ci); 1553 pos += len; 1554 written += len; 1555 if (pos > i_size_read(inode)) { 1556 check_caps = ceph_inode_set_size(inode, pos); 1557 if (check_caps) 1558 ceph_check_caps(ceph_inode(inode), 1559 CHECK_CAPS_AUTHONLY, 1560 NULL); 1561 } 1562 1563 } 1564 1565 if (ret != -EOLDSNAPC && written > 0) { 1566 ret = written; 1567 iocb->ki_pos = pos; 1568 } 1569 return ret; 1570 } 1571 1572 /* 1573 * Wrap generic_file_aio_read with checks for cap bits on the inode. 1574 * Atomically grab references, so that those bits are not released 1575 * back to the MDS mid-read. 1576 * 1577 * Hmm, the sync read case isn't actually async... should it be? 1578 */ 1579 static ssize_t ceph_read_iter(struct kiocb *iocb, struct iov_iter *to) 1580 { 1581 struct file *filp = iocb->ki_filp; 1582 struct ceph_file_info *fi = filp->private_data; 1583 size_t len = iov_iter_count(to); 1584 struct inode *inode = file_inode(filp); 1585 struct ceph_inode_info *ci = ceph_inode(inode); 1586 bool direct_lock = iocb->ki_flags & IOCB_DIRECT; 1587 ssize_t ret; 1588 int want = 0, got = 0; 1589 int retry_op = 0, read = 0; 1590 1591 again: 1592 dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n", 1593 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, inode); 1594 1595 if (ceph_inode_is_shutdown(inode)) 1596 return -ESTALE; 1597 1598 if (direct_lock) 1599 ceph_start_io_direct(inode); 1600 else 1601 ceph_start_io_read(inode); 1602 1603 if (!(fi->flags & CEPH_F_SYNC) && !direct_lock) 1604 want |= CEPH_CAP_FILE_CACHE; 1605 if (fi->fmode & CEPH_FILE_MODE_LAZY) 1606 want |= CEPH_CAP_FILE_LAZYIO; 1607 1608 ret = ceph_get_caps(filp, CEPH_CAP_FILE_RD, want, -1, &got); 1609 if (ret < 0) { 1610 if (direct_lock) 1611 ceph_end_io_direct(inode); 1612 else 1613 ceph_end_io_read(inode); 1614 return ret; 1615 } 1616 1617 if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 || 1618 (iocb->ki_flags & IOCB_DIRECT) || 1619 (fi->flags & CEPH_F_SYNC)) { 1620 1621 dout("aio_sync_read %p %llx.%llx %llu~%u got cap refs on %s\n", 1622 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, 1623 ceph_cap_string(got)); 1624 1625 if (ci->i_inline_version == CEPH_INLINE_NONE) { 1626 if (!retry_op && (iocb->ki_flags & IOCB_DIRECT)) { 1627 ret = ceph_direct_read_write(iocb, to, 1628 NULL, NULL); 1629 if (ret >= 0 && ret < len) 1630 retry_op = CHECK_EOF; 1631 } else { 1632 ret = ceph_sync_read(iocb, to, &retry_op); 1633 } 1634 } else { 1635 retry_op = READ_INLINE; 1636 } 1637 } else { 1638 CEPH_DEFINE_RW_CONTEXT(rw_ctx, got); 1639 dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n", 1640 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, 1641 ceph_cap_string(got)); 1642 ceph_add_rw_context(fi, &rw_ctx); 1643 ret = generic_file_read_iter(iocb, to); 1644 ceph_del_rw_context(fi, &rw_ctx); 1645 } 1646 1647 dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n", 1648 inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret); 1649 ceph_put_cap_refs(ci, got); 1650 1651 if (direct_lock) 1652 ceph_end_io_direct(inode); 1653 else 1654 ceph_end_io_read(inode); 1655 1656 if (retry_op > HAVE_RETRIED && ret >= 0) { 1657 int statret; 1658 struct page *page = NULL; 1659 loff_t i_size; 1660 if (retry_op == READ_INLINE) { 1661 page = __page_cache_alloc(GFP_KERNEL); 1662 if (!page) 1663 return -ENOMEM; 1664 } 1665 1666 statret = __ceph_do_getattr(inode, page, 1667 CEPH_STAT_CAP_INLINE_DATA, !!page); 1668 if (statret < 0) { 1669 if (page) 1670 __free_page(page); 1671 if (statret == -ENODATA) { 1672 BUG_ON(retry_op != READ_INLINE); 1673 goto again; 1674 } 1675 return statret; 1676 } 1677 1678 i_size = i_size_read(inode); 1679 if (retry_op == READ_INLINE) { 1680 BUG_ON(ret > 0 || read > 0); 1681 if (iocb->ki_pos < i_size && 1682 iocb->ki_pos < PAGE_SIZE) { 1683 loff_t end = min_t(loff_t, i_size, 1684 iocb->ki_pos + len); 1685 end = min_t(loff_t, end, PAGE_SIZE); 1686 if (statret < end) 1687 zero_user_segment(page, statret, end); 1688 ret = copy_page_to_iter(page, 1689 iocb->ki_pos & ~PAGE_MASK, 1690 end - iocb->ki_pos, to); 1691 iocb->ki_pos += ret; 1692 read += ret; 1693 } 1694 if (iocb->ki_pos < i_size && read < len) { 1695 size_t zlen = min_t(size_t, len - read, 1696 i_size - iocb->ki_pos); 1697 ret = iov_iter_zero(zlen, to); 1698 iocb->ki_pos += ret; 1699 read += ret; 1700 } 1701 __free_pages(page, 0); 1702 return read; 1703 } 1704 1705 /* hit EOF or hole? */ 1706 if (retry_op == CHECK_EOF && iocb->ki_pos < i_size && 1707 ret < len) { 1708 dout("sync_read hit hole, ppos %lld < size %lld" 1709 ", reading more\n", iocb->ki_pos, i_size); 1710 1711 read += ret; 1712 len -= ret; 1713 retry_op = HAVE_RETRIED; 1714 goto again; 1715 } 1716 } 1717 1718 if (ret >= 0) 1719 ret += read; 1720 1721 return ret; 1722 } 1723 1724 /* 1725 * Take cap references to avoid releasing caps to MDS mid-write. 1726 * 1727 * If we are synchronous, and write with an old snap context, the OSD 1728 * may return EOLDSNAPC. In that case, retry the write.. _after_ 1729 * dropping our cap refs and allowing the pending snap to logically 1730 * complete _before_ this write occurs. 1731 * 1732 * If we are near ENOSPC, write synchronously. 1733 */ 1734 static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from) 1735 { 1736 struct file *file = iocb->ki_filp; 1737 struct ceph_file_info *fi = file->private_data; 1738 struct inode *inode = file_inode(file); 1739 struct ceph_inode_info *ci = ceph_inode(inode); 1740 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 1741 struct ceph_osd_client *osdc = &fsc->client->osdc; 1742 struct ceph_cap_flush *prealloc_cf; 1743 ssize_t count, written = 0; 1744 int err, want = 0, got; 1745 bool direct_lock = false; 1746 u32 map_flags; 1747 u64 pool_flags; 1748 loff_t pos; 1749 loff_t limit = max(i_size_read(inode), fsc->max_file_size); 1750 1751 if (ceph_inode_is_shutdown(inode)) 1752 return -ESTALE; 1753 1754 if (ceph_snap(inode) != CEPH_NOSNAP) 1755 return -EROFS; 1756 1757 prealloc_cf = ceph_alloc_cap_flush(); 1758 if (!prealloc_cf) 1759 return -ENOMEM; 1760 1761 if ((iocb->ki_flags & (IOCB_DIRECT | IOCB_APPEND)) == IOCB_DIRECT) 1762 direct_lock = true; 1763 1764 retry_snap: 1765 if (direct_lock) 1766 ceph_start_io_direct(inode); 1767 else 1768 ceph_start_io_write(inode); 1769 1770 /* We can write back this queue in page reclaim */ 1771 current->backing_dev_info = inode_to_bdi(inode); 1772 1773 if (iocb->ki_flags & IOCB_APPEND) { 1774 err = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false); 1775 if (err < 0) 1776 goto out; 1777 } 1778 1779 err = generic_write_checks(iocb, from); 1780 if (err <= 0) 1781 goto out; 1782 1783 pos = iocb->ki_pos; 1784 if (unlikely(pos >= limit)) { 1785 err = -EFBIG; 1786 goto out; 1787 } else { 1788 iov_iter_truncate(from, limit - pos); 1789 } 1790 1791 count = iov_iter_count(from); 1792 if (ceph_quota_is_max_bytes_exceeded(inode, pos + count)) { 1793 err = -EDQUOT; 1794 goto out; 1795 } 1796 1797 down_read(&osdc->lock); 1798 map_flags = osdc->osdmap->flags; 1799 pool_flags = ceph_pg_pool_flags(osdc->osdmap, ci->i_layout.pool_id); 1800 up_read(&osdc->lock); 1801 if ((map_flags & CEPH_OSDMAP_FULL) || 1802 (pool_flags & CEPH_POOL_FLAG_FULL)) { 1803 err = -ENOSPC; 1804 goto out; 1805 } 1806 1807 err = file_remove_privs(file); 1808 if (err) 1809 goto out; 1810 1811 dout("aio_write %p %llx.%llx %llu~%zd getting caps. i_size %llu\n", 1812 inode, ceph_vinop(inode), pos, count, i_size_read(inode)); 1813 if (!(fi->flags & CEPH_F_SYNC) && !direct_lock) 1814 want |= CEPH_CAP_FILE_BUFFER; 1815 if (fi->fmode & CEPH_FILE_MODE_LAZY) 1816 want |= CEPH_CAP_FILE_LAZYIO; 1817 got = 0; 1818 err = ceph_get_caps(file, CEPH_CAP_FILE_WR, want, pos + count, &got); 1819 if (err < 0) 1820 goto out; 1821 1822 err = file_update_time(file); 1823 if (err) 1824 goto out_caps; 1825 1826 inode_inc_iversion_raw(inode); 1827 1828 dout("aio_write %p %llx.%llx %llu~%zd got cap refs on %s\n", 1829 inode, ceph_vinop(inode), pos, count, ceph_cap_string(got)); 1830 1831 if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 || 1832 (iocb->ki_flags & IOCB_DIRECT) || (fi->flags & CEPH_F_SYNC) || 1833 (ci->i_ceph_flags & CEPH_I_ERROR_WRITE)) { 1834 struct ceph_snap_context *snapc; 1835 struct iov_iter data; 1836 1837 spin_lock(&ci->i_ceph_lock); 1838 if (__ceph_have_pending_cap_snap(ci)) { 1839 struct ceph_cap_snap *capsnap = 1840 list_last_entry(&ci->i_cap_snaps, 1841 struct ceph_cap_snap, 1842 ci_item); 1843 snapc = ceph_get_snap_context(capsnap->context); 1844 } else { 1845 BUG_ON(!ci->i_head_snapc); 1846 snapc = ceph_get_snap_context(ci->i_head_snapc); 1847 } 1848 spin_unlock(&ci->i_ceph_lock); 1849 1850 /* we might need to revert back to that point */ 1851 data = *from; 1852 if (iocb->ki_flags & IOCB_DIRECT) 1853 written = ceph_direct_read_write(iocb, &data, snapc, 1854 &prealloc_cf); 1855 else 1856 written = ceph_sync_write(iocb, &data, pos, snapc); 1857 if (direct_lock) 1858 ceph_end_io_direct(inode); 1859 else 1860 ceph_end_io_write(inode); 1861 if (written > 0) 1862 iov_iter_advance(from, written); 1863 ceph_put_snap_context(snapc); 1864 } else { 1865 /* 1866 * No need to acquire the i_truncate_mutex. Because 1867 * the MDS revokes Fwb caps before sending truncate 1868 * message to us. We can't get Fwb cap while there 1869 * are pending vmtruncate. So write and vmtruncate 1870 * can not run at the same time 1871 */ 1872 written = generic_perform_write(iocb, from); 1873 if (likely(written >= 0)) 1874 iocb->ki_pos = pos + written; 1875 ceph_end_io_write(inode); 1876 } 1877 1878 if (written >= 0) { 1879 int dirty; 1880 1881 spin_lock(&ci->i_ceph_lock); 1882 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR, 1883 &prealloc_cf); 1884 spin_unlock(&ci->i_ceph_lock); 1885 if (dirty) 1886 __mark_inode_dirty(inode, dirty); 1887 if (ceph_quota_is_max_bytes_approaching(inode, iocb->ki_pos)) 1888 ceph_check_caps(ci, 0, NULL); 1889 } 1890 1891 dout("aio_write %p %llx.%llx %llu~%u dropping cap refs on %s\n", 1892 inode, ceph_vinop(inode), pos, (unsigned)count, 1893 ceph_cap_string(got)); 1894 ceph_put_cap_refs(ci, got); 1895 1896 if (written == -EOLDSNAPC) { 1897 dout("aio_write %p %llx.%llx %llu~%u" "got EOLDSNAPC, retrying\n", 1898 inode, ceph_vinop(inode), pos, (unsigned)count); 1899 goto retry_snap; 1900 } 1901 1902 if (written >= 0) { 1903 if ((map_flags & CEPH_OSDMAP_NEARFULL) || 1904 (pool_flags & CEPH_POOL_FLAG_NEARFULL)) 1905 iocb->ki_flags |= IOCB_DSYNC; 1906 written = generic_write_sync(iocb, written); 1907 } 1908 1909 goto out_unlocked; 1910 out_caps: 1911 ceph_put_cap_refs(ci, got); 1912 out: 1913 if (direct_lock) 1914 ceph_end_io_direct(inode); 1915 else 1916 ceph_end_io_write(inode); 1917 out_unlocked: 1918 ceph_free_cap_flush(prealloc_cf); 1919 current->backing_dev_info = NULL; 1920 return written ? written : err; 1921 } 1922 1923 /* 1924 * llseek. be sure to verify file size on SEEK_END. 1925 */ 1926 static loff_t ceph_llseek(struct file *file, loff_t offset, int whence) 1927 { 1928 struct inode *inode = file->f_mapping->host; 1929 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 1930 loff_t i_size; 1931 loff_t ret; 1932 1933 inode_lock(inode); 1934 1935 if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) { 1936 ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false); 1937 if (ret < 0) 1938 goto out; 1939 } 1940 1941 i_size = i_size_read(inode); 1942 switch (whence) { 1943 case SEEK_END: 1944 offset += i_size; 1945 break; 1946 case SEEK_CUR: 1947 /* 1948 * Here we special-case the lseek(fd, 0, SEEK_CUR) 1949 * position-querying operation. Avoid rewriting the "same" 1950 * f_pos value back to the file because a concurrent read(), 1951 * write() or lseek() might have altered it 1952 */ 1953 if (offset == 0) { 1954 ret = file->f_pos; 1955 goto out; 1956 } 1957 offset += file->f_pos; 1958 break; 1959 case SEEK_DATA: 1960 if (offset < 0 || offset >= i_size) { 1961 ret = -ENXIO; 1962 goto out; 1963 } 1964 break; 1965 case SEEK_HOLE: 1966 if (offset < 0 || offset >= i_size) { 1967 ret = -ENXIO; 1968 goto out; 1969 } 1970 offset = i_size; 1971 break; 1972 } 1973 1974 ret = vfs_setpos(file, offset, max(i_size, fsc->max_file_size)); 1975 1976 out: 1977 inode_unlock(inode); 1978 return ret; 1979 } 1980 1981 static inline void ceph_zero_partial_page( 1982 struct inode *inode, loff_t offset, unsigned size) 1983 { 1984 struct page *page; 1985 pgoff_t index = offset >> PAGE_SHIFT; 1986 1987 page = find_lock_page(inode->i_mapping, index); 1988 if (page) { 1989 wait_on_page_writeback(page); 1990 zero_user(page, offset & (PAGE_SIZE - 1), size); 1991 unlock_page(page); 1992 put_page(page); 1993 } 1994 } 1995 1996 static void ceph_zero_pagecache_range(struct inode *inode, loff_t offset, 1997 loff_t length) 1998 { 1999 loff_t nearly = round_up(offset, PAGE_SIZE); 2000 if (offset < nearly) { 2001 loff_t size = nearly - offset; 2002 if (length < size) 2003 size = length; 2004 ceph_zero_partial_page(inode, offset, size); 2005 offset += size; 2006 length -= size; 2007 } 2008 if (length >= PAGE_SIZE) { 2009 loff_t size = round_down(length, PAGE_SIZE); 2010 truncate_pagecache_range(inode, offset, offset + size - 1); 2011 offset += size; 2012 length -= size; 2013 } 2014 if (length) 2015 ceph_zero_partial_page(inode, offset, length); 2016 } 2017 2018 static int ceph_zero_partial_object(struct inode *inode, 2019 loff_t offset, loff_t *length) 2020 { 2021 struct ceph_inode_info *ci = ceph_inode(inode); 2022 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 2023 struct ceph_osd_request *req; 2024 int ret = 0; 2025 loff_t zero = 0; 2026 int op; 2027 2028 if (!length) { 2029 op = offset ? CEPH_OSD_OP_DELETE : CEPH_OSD_OP_TRUNCATE; 2030 length = &zero; 2031 } else { 2032 op = CEPH_OSD_OP_ZERO; 2033 } 2034 2035 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, 2036 ceph_vino(inode), 2037 offset, length, 2038 0, 1, op, 2039 CEPH_OSD_FLAG_WRITE, 2040 NULL, 0, 0, false); 2041 if (IS_ERR(req)) { 2042 ret = PTR_ERR(req); 2043 goto out; 2044 } 2045 2046 req->r_mtime = inode->i_mtime; 2047 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false); 2048 if (!ret) { 2049 ret = ceph_osdc_wait_request(&fsc->client->osdc, req); 2050 if (ret == -ENOENT) 2051 ret = 0; 2052 } 2053 ceph_osdc_put_request(req); 2054 2055 out: 2056 return ret; 2057 } 2058 2059 static int ceph_zero_objects(struct inode *inode, loff_t offset, loff_t length) 2060 { 2061 int ret = 0; 2062 struct ceph_inode_info *ci = ceph_inode(inode); 2063 s32 stripe_unit = ci->i_layout.stripe_unit; 2064 s32 stripe_count = ci->i_layout.stripe_count; 2065 s32 object_size = ci->i_layout.object_size; 2066 u64 object_set_size = object_size * stripe_count; 2067 u64 nearly, t; 2068 2069 /* round offset up to next period boundary */ 2070 nearly = offset + object_set_size - 1; 2071 t = nearly; 2072 nearly -= do_div(t, object_set_size); 2073 2074 while (length && offset < nearly) { 2075 loff_t size = length; 2076 ret = ceph_zero_partial_object(inode, offset, &size); 2077 if (ret < 0) 2078 return ret; 2079 offset += size; 2080 length -= size; 2081 } 2082 while (length >= object_set_size) { 2083 int i; 2084 loff_t pos = offset; 2085 for (i = 0; i < stripe_count; ++i) { 2086 ret = ceph_zero_partial_object(inode, pos, NULL); 2087 if (ret < 0) 2088 return ret; 2089 pos += stripe_unit; 2090 } 2091 offset += object_set_size; 2092 length -= object_set_size; 2093 } 2094 while (length) { 2095 loff_t size = length; 2096 ret = ceph_zero_partial_object(inode, offset, &size); 2097 if (ret < 0) 2098 return ret; 2099 offset += size; 2100 length -= size; 2101 } 2102 return ret; 2103 } 2104 2105 static long ceph_fallocate(struct file *file, int mode, 2106 loff_t offset, loff_t length) 2107 { 2108 struct ceph_file_info *fi = file->private_data; 2109 struct inode *inode = file_inode(file); 2110 struct ceph_inode_info *ci = ceph_inode(inode); 2111 struct ceph_cap_flush *prealloc_cf; 2112 int want, got = 0; 2113 int dirty; 2114 int ret = 0; 2115 loff_t endoff = 0; 2116 loff_t size; 2117 2118 if (mode != (FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE)) 2119 return -EOPNOTSUPP; 2120 2121 if (!S_ISREG(inode->i_mode)) 2122 return -EOPNOTSUPP; 2123 2124 prealloc_cf = ceph_alloc_cap_flush(); 2125 if (!prealloc_cf) 2126 return -ENOMEM; 2127 2128 inode_lock(inode); 2129 2130 if (ceph_snap(inode) != CEPH_NOSNAP) { 2131 ret = -EROFS; 2132 goto unlock; 2133 } 2134 2135 size = i_size_read(inode); 2136 2137 /* Are we punching a hole beyond EOF? */ 2138 if (offset >= size) 2139 goto unlock; 2140 if ((offset + length) > size) 2141 length = size - offset; 2142 2143 if (fi->fmode & CEPH_FILE_MODE_LAZY) 2144 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; 2145 else 2146 want = CEPH_CAP_FILE_BUFFER; 2147 2148 ret = ceph_get_caps(file, CEPH_CAP_FILE_WR, want, endoff, &got); 2149 if (ret < 0) 2150 goto unlock; 2151 2152 filemap_invalidate_lock(inode->i_mapping); 2153 ceph_fscache_invalidate(inode, false); 2154 ceph_zero_pagecache_range(inode, offset, length); 2155 ret = ceph_zero_objects(inode, offset, length); 2156 2157 if (!ret) { 2158 spin_lock(&ci->i_ceph_lock); 2159 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR, 2160 &prealloc_cf); 2161 spin_unlock(&ci->i_ceph_lock); 2162 if (dirty) 2163 __mark_inode_dirty(inode, dirty); 2164 } 2165 filemap_invalidate_unlock(inode->i_mapping); 2166 2167 ceph_put_cap_refs(ci, got); 2168 unlock: 2169 inode_unlock(inode); 2170 ceph_free_cap_flush(prealloc_cf); 2171 return ret; 2172 } 2173 2174 /* 2175 * This function tries to get FILE_WR capabilities for dst_ci and FILE_RD for 2176 * src_ci. Two attempts are made to obtain both caps, and an error is return if 2177 * this fails; zero is returned on success. 2178 */ 2179 static int get_rd_wr_caps(struct file *src_filp, int *src_got, 2180 struct file *dst_filp, 2181 loff_t dst_endoff, int *dst_got) 2182 { 2183 int ret = 0; 2184 bool retrying = false; 2185 2186 retry_caps: 2187 ret = ceph_get_caps(dst_filp, CEPH_CAP_FILE_WR, CEPH_CAP_FILE_BUFFER, 2188 dst_endoff, dst_got); 2189 if (ret < 0) 2190 return ret; 2191 2192 /* 2193 * Since we're already holding the FILE_WR capability for the dst file, 2194 * we would risk a deadlock by using ceph_get_caps. Thus, we'll do some 2195 * retry dance instead to try to get both capabilities. 2196 */ 2197 ret = ceph_try_get_caps(file_inode(src_filp), 2198 CEPH_CAP_FILE_RD, CEPH_CAP_FILE_SHARED, 2199 false, src_got); 2200 if (ret <= 0) { 2201 /* Start by dropping dst_ci caps and getting src_ci caps */ 2202 ceph_put_cap_refs(ceph_inode(file_inode(dst_filp)), *dst_got); 2203 if (retrying) { 2204 if (!ret) 2205 /* ceph_try_get_caps masks EAGAIN */ 2206 ret = -EAGAIN; 2207 return ret; 2208 } 2209 ret = ceph_get_caps(src_filp, CEPH_CAP_FILE_RD, 2210 CEPH_CAP_FILE_SHARED, -1, src_got); 2211 if (ret < 0) 2212 return ret; 2213 /*... drop src_ci caps too, and retry */ 2214 ceph_put_cap_refs(ceph_inode(file_inode(src_filp)), *src_got); 2215 retrying = true; 2216 goto retry_caps; 2217 } 2218 return ret; 2219 } 2220 2221 static void put_rd_wr_caps(struct ceph_inode_info *src_ci, int src_got, 2222 struct ceph_inode_info *dst_ci, int dst_got) 2223 { 2224 ceph_put_cap_refs(src_ci, src_got); 2225 ceph_put_cap_refs(dst_ci, dst_got); 2226 } 2227 2228 /* 2229 * This function does several size-related checks, returning an error if: 2230 * - source file is smaller than off+len 2231 * - destination file size is not OK (inode_newsize_ok()) 2232 * - max bytes quotas is exceeded 2233 */ 2234 static int is_file_size_ok(struct inode *src_inode, struct inode *dst_inode, 2235 loff_t src_off, loff_t dst_off, size_t len) 2236 { 2237 loff_t size, endoff; 2238 2239 size = i_size_read(src_inode); 2240 /* 2241 * Don't copy beyond source file EOF. Instead of simply setting length 2242 * to (size - src_off), just drop to VFS default implementation, as the 2243 * local i_size may be stale due to other clients writing to the source 2244 * inode. 2245 */ 2246 if (src_off + len > size) { 2247 dout("Copy beyond EOF (%llu + %zu > %llu)\n", 2248 src_off, len, size); 2249 return -EOPNOTSUPP; 2250 } 2251 size = i_size_read(dst_inode); 2252 2253 endoff = dst_off + len; 2254 if (inode_newsize_ok(dst_inode, endoff)) 2255 return -EOPNOTSUPP; 2256 2257 if (ceph_quota_is_max_bytes_exceeded(dst_inode, endoff)) 2258 return -EDQUOT; 2259 2260 return 0; 2261 } 2262 2263 static struct ceph_osd_request * 2264 ceph_alloc_copyfrom_request(struct ceph_osd_client *osdc, 2265 u64 src_snapid, 2266 struct ceph_object_id *src_oid, 2267 struct ceph_object_locator *src_oloc, 2268 struct ceph_object_id *dst_oid, 2269 struct ceph_object_locator *dst_oloc, 2270 u32 truncate_seq, u64 truncate_size) 2271 { 2272 struct ceph_osd_request *req; 2273 int ret; 2274 u32 src_fadvise_flags = 2275 CEPH_OSD_OP_FLAG_FADVISE_SEQUENTIAL | 2276 CEPH_OSD_OP_FLAG_FADVISE_NOCACHE; 2277 u32 dst_fadvise_flags = 2278 CEPH_OSD_OP_FLAG_FADVISE_SEQUENTIAL | 2279 CEPH_OSD_OP_FLAG_FADVISE_DONTNEED; 2280 2281 req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_KERNEL); 2282 if (!req) 2283 return ERR_PTR(-ENOMEM); 2284 2285 req->r_flags = CEPH_OSD_FLAG_WRITE; 2286 2287 ceph_oloc_copy(&req->r_t.base_oloc, dst_oloc); 2288 ceph_oid_copy(&req->r_t.base_oid, dst_oid); 2289 2290 ret = osd_req_op_copy_from_init(req, src_snapid, 0, 2291 src_oid, src_oloc, 2292 src_fadvise_flags, 2293 dst_fadvise_flags, 2294 truncate_seq, 2295 truncate_size, 2296 CEPH_OSD_COPY_FROM_FLAG_TRUNCATE_SEQ); 2297 if (ret) 2298 goto out; 2299 2300 ret = ceph_osdc_alloc_messages(req, GFP_KERNEL); 2301 if (ret) 2302 goto out; 2303 2304 return req; 2305 2306 out: 2307 ceph_osdc_put_request(req); 2308 return ERR_PTR(ret); 2309 } 2310 2311 static ssize_t ceph_do_objects_copy(struct ceph_inode_info *src_ci, u64 *src_off, 2312 struct ceph_inode_info *dst_ci, u64 *dst_off, 2313 struct ceph_fs_client *fsc, 2314 size_t len, unsigned int flags) 2315 { 2316 struct ceph_object_locator src_oloc, dst_oloc; 2317 struct ceph_object_id src_oid, dst_oid; 2318 struct ceph_osd_client *osdc; 2319 struct ceph_osd_request *req; 2320 size_t bytes = 0; 2321 u64 src_objnum, src_objoff, dst_objnum, dst_objoff; 2322 u32 src_objlen, dst_objlen; 2323 u32 object_size = src_ci->i_layout.object_size; 2324 int ret; 2325 2326 src_oloc.pool = src_ci->i_layout.pool_id; 2327 src_oloc.pool_ns = ceph_try_get_string(src_ci->i_layout.pool_ns); 2328 dst_oloc.pool = dst_ci->i_layout.pool_id; 2329 dst_oloc.pool_ns = ceph_try_get_string(dst_ci->i_layout.pool_ns); 2330 osdc = &fsc->client->osdc; 2331 2332 while (len >= object_size) { 2333 ceph_calc_file_object_mapping(&src_ci->i_layout, *src_off, 2334 object_size, &src_objnum, 2335 &src_objoff, &src_objlen); 2336 ceph_calc_file_object_mapping(&dst_ci->i_layout, *dst_off, 2337 object_size, &dst_objnum, 2338 &dst_objoff, &dst_objlen); 2339 ceph_oid_init(&src_oid); 2340 ceph_oid_printf(&src_oid, "%llx.%08llx", 2341 src_ci->i_vino.ino, src_objnum); 2342 ceph_oid_init(&dst_oid); 2343 ceph_oid_printf(&dst_oid, "%llx.%08llx", 2344 dst_ci->i_vino.ino, dst_objnum); 2345 /* Do an object remote copy */ 2346 req = ceph_alloc_copyfrom_request(osdc, src_ci->i_vino.snap, 2347 &src_oid, &src_oloc, 2348 &dst_oid, &dst_oloc, 2349 dst_ci->i_truncate_seq, 2350 dst_ci->i_truncate_size); 2351 if (IS_ERR(req)) 2352 ret = PTR_ERR(req); 2353 else { 2354 ceph_osdc_start_request(osdc, req, false); 2355 ret = ceph_osdc_wait_request(osdc, req); 2356 ceph_update_copyfrom_metrics(&fsc->mdsc->metric, 2357 req->r_start_latency, 2358 req->r_end_latency, 2359 object_size, ret); 2360 ceph_osdc_put_request(req); 2361 } 2362 if (ret) { 2363 if (ret == -EOPNOTSUPP) { 2364 fsc->have_copy_from2 = false; 2365 pr_notice("OSDs don't support copy-from2; disabling copy offload\n"); 2366 } 2367 dout("ceph_osdc_copy_from returned %d\n", ret); 2368 if (!bytes) 2369 bytes = ret; 2370 goto out; 2371 } 2372 len -= object_size; 2373 bytes += object_size; 2374 *src_off += object_size; 2375 *dst_off += object_size; 2376 } 2377 2378 out: 2379 ceph_oloc_destroy(&src_oloc); 2380 ceph_oloc_destroy(&dst_oloc); 2381 return bytes; 2382 } 2383 2384 static ssize_t __ceph_copy_file_range(struct file *src_file, loff_t src_off, 2385 struct file *dst_file, loff_t dst_off, 2386 size_t len, unsigned int flags) 2387 { 2388 struct inode *src_inode = file_inode(src_file); 2389 struct inode *dst_inode = file_inode(dst_file); 2390 struct ceph_inode_info *src_ci = ceph_inode(src_inode); 2391 struct ceph_inode_info *dst_ci = ceph_inode(dst_inode); 2392 struct ceph_cap_flush *prealloc_cf; 2393 struct ceph_fs_client *src_fsc = ceph_inode_to_client(src_inode); 2394 loff_t size; 2395 ssize_t ret = -EIO, bytes; 2396 u64 src_objnum, dst_objnum, src_objoff, dst_objoff; 2397 u32 src_objlen, dst_objlen; 2398 int src_got = 0, dst_got = 0, err, dirty; 2399 2400 if (src_inode->i_sb != dst_inode->i_sb) { 2401 struct ceph_fs_client *dst_fsc = ceph_inode_to_client(dst_inode); 2402 2403 if (ceph_fsid_compare(&src_fsc->client->fsid, 2404 &dst_fsc->client->fsid)) { 2405 dout("Copying files across clusters: src: %pU dst: %pU\n", 2406 &src_fsc->client->fsid, &dst_fsc->client->fsid); 2407 return -EXDEV; 2408 } 2409 } 2410 if (ceph_snap(dst_inode) != CEPH_NOSNAP) 2411 return -EROFS; 2412 2413 /* 2414 * Some of the checks below will return -EOPNOTSUPP, which will force a 2415 * fallback to the default VFS copy_file_range implementation. This is 2416 * desirable in several cases (for ex, the 'len' is smaller than the 2417 * size of the objects, or in cases where that would be more 2418 * efficient). 2419 */ 2420 2421 if (ceph_test_mount_opt(src_fsc, NOCOPYFROM)) 2422 return -EOPNOTSUPP; 2423 2424 if (!src_fsc->have_copy_from2) 2425 return -EOPNOTSUPP; 2426 2427 /* 2428 * Striped file layouts require that we copy partial objects, but the 2429 * OSD copy-from operation only supports full-object copies. Limit 2430 * this to non-striped file layouts for now. 2431 */ 2432 if ((src_ci->i_layout.stripe_unit != dst_ci->i_layout.stripe_unit) || 2433 (src_ci->i_layout.stripe_count != 1) || 2434 (dst_ci->i_layout.stripe_count != 1) || 2435 (src_ci->i_layout.object_size != dst_ci->i_layout.object_size)) { 2436 dout("Invalid src/dst files layout\n"); 2437 return -EOPNOTSUPP; 2438 } 2439 2440 if (len < src_ci->i_layout.object_size) 2441 return -EOPNOTSUPP; /* no remote copy will be done */ 2442 2443 prealloc_cf = ceph_alloc_cap_flush(); 2444 if (!prealloc_cf) 2445 return -ENOMEM; 2446 2447 /* Start by sync'ing the source and destination files */ 2448 ret = file_write_and_wait_range(src_file, src_off, (src_off + len)); 2449 if (ret < 0) { 2450 dout("failed to write src file (%zd)\n", ret); 2451 goto out; 2452 } 2453 ret = file_write_and_wait_range(dst_file, dst_off, (dst_off + len)); 2454 if (ret < 0) { 2455 dout("failed to write dst file (%zd)\n", ret); 2456 goto out; 2457 } 2458 2459 /* 2460 * We need FILE_WR caps for dst_ci and FILE_RD for src_ci as other 2461 * clients may have dirty data in their caches. And OSDs know nothing 2462 * about caps, so they can't safely do the remote object copies. 2463 */ 2464 err = get_rd_wr_caps(src_file, &src_got, 2465 dst_file, (dst_off + len), &dst_got); 2466 if (err < 0) { 2467 dout("get_rd_wr_caps returned %d\n", err); 2468 ret = -EOPNOTSUPP; 2469 goto out; 2470 } 2471 2472 ret = is_file_size_ok(src_inode, dst_inode, src_off, dst_off, len); 2473 if (ret < 0) 2474 goto out_caps; 2475 2476 /* Drop dst file cached pages */ 2477 ceph_fscache_invalidate(dst_inode, false); 2478 ret = invalidate_inode_pages2_range(dst_inode->i_mapping, 2479 dst_off >> PAGE_SHIFT, 2480 (dst_off + len) >> PAGE_SHIFT); 2481 if (ret < 0) { 2482 dout("Failed to invalidate inode pages (%zd)\n", ret); 2483 ret = 0; /* XXX */ 2484 } 2485 ceph_calc_file_object_mapping(&src_ci->i_layout, src_off, 2486 src_ci->i_layout.object_size, 2487 &src_objnum, &src_objoff, &src_objlen); 2488 ceph_calc_file_object_mapping(&dst_ci->i_layout, dst_off, 2489 dst_ci->i_layout.object_size, 2490 &dst_objnum, &dst_objoff, &dst_objlen); 2491 /* object-level offsets need to the same */ 2492 if (src_objoff != dst_objoff) { 2493 ret = -EOPNOTSUPP; 2494 goto out_caps; 2495 } 2496 2497 /* 2498 * Do a manual copy if the object offset isn't object aligned. 2499 * 'src_objlen' contains the bytes left until the end of the object, 2500 * starting at the src_off 2501 */ 2502 if (src_objoff) { 2503 dout("Initial partial copy of %u bytes\n", src_objlen); 2504 2505 /* 2506 * we need to temporarily drop all caps as we'll be calling 2507 * {read,write}_iter, which will get caps again. 2508 */ 2509 put_rd_wr_caps(src_ci, src_got, dst_ci, dst_got); 2510 ret = do_splice_direct(src_file, &src_off, dst_file, 2511 &dst_off, src_objlen, flags); 2512 /* Abort on short copies or on error */ 2513 if (ret < src_objlen) { 2514 dout("Failed partial copy (%zd)\n", ret); 2515 goto out; 2516 } 2517 len -= ret; 2518 err = get_rd_wr_caps(src_file, &src_got, 2519 dst_file, (dst_off + len), &dst_got); 2520 if (err < 0) 2521 goto out; 2522 err = is_file_size_ok(src_inode, dst_inode, 2523 src_off, dst_off, len); 2524 if (err < 0) 2525 goto out_caps; 2526 } 2527 2528 size = i_size_read(dst_inode); 2529 bytes = ceph_do_objects_copy(src_ci, &src_off, dst_ci, &dst_off, 2530 src_fsc, len, flags); 2531 if (bytes <= 0) { 2532 if (!ret) 2533 ret = bytes; 2534 goto out_caps; 2535 } 2536 dout("Copied %zu bytes out of %zu\n", bytes, len); 2537 len -= bytes; 2538 ret += bytes; 2539 2540 file_update_time(dst_file); 2541 inode_inc_iversion_raw(dst_inode); 2542 2543 if (dst_off > size) { 2544 /* Let the MDS know about dst file size change */ 2545 if (ceph_inode_set_size(dst_inode, dst_off) || 2546 ceph_quota_is_max_bytes_approaching(dst_inode, dst_off)) 2547 ceph_check_caps(dst_ci, CHECK_CAPS_AUTHONLY, NULL); 2548 } 2549 /* Mark Fw dirty */ 2550 spin_lock(&dst_ci->i_ceph_lock); 2551 dirty = __ceph_mark_dirty_caps(dst_ci, CEPH_CAP_FILE_WR, &prealloc_cf); 2552 spin_unlock(&dst_ci->i_ceph_lock); 2553 if (dirty) 2554 __mark_inode_dirty(dst_inode, dirty); 2555 2556 out_caps: 2557 put_rd_wr_caps(src_ci, src_got, dst_ci, dst_got); 2558 2559 /* 2560 * Do the final manual copy if we still have some bytes left, unless 2561 * there were errors in remote object copies (len >= object_size). 2562 */ 2563 if (len && (len < src_ci->i_layout.object_size)) { 2564 dout("Final partial copy of %zu bytes\n", len); 2565 bytes = do_splice_direct(src_file, &src_off, dst_file, 2566 &dst_off, len, flags); 2567 if (bytes > 0) 2568 ret += bytes; 2569 else 2570 dout("Failed partial copy (%zd)\n", bytes); 2571 } 2572 2573 out: 2574 ceph_free_cap_flush(prealloc_cf); 2575 2576 return ret; 2577 } 2578 2579 static ssize_t ceph_copy_file_range(struct file *src_file, loff_t src_off, 2580 struct file *dst_file, loff_t dst_off, 2581 size_t len, unsigned int flags) 2582 { 2583 ssize_t ret; 2584 2585 ret = __ceph_copy_file_range(src_file, src_off, dst_file, dst_off, 2586 len, flags); 2587 2588 if (ret == -EOPNOTSUPP || ret == -EXDEV) 2589 ret = generic_copy_file_range(src_file, src_off, dst_file, 2590 dst_off, len, flags); 2591 return ret; 2592 } 2593 2594 const struct file_operations ceph_file_fops = { 2595 .open = ceph_open, 2596 .release = ceph_release, 2597 .llseek = ceph_llseek, 2598 .read_iter = ceph_read_iter, 2599 .write_iter = ceph_write_iter, 2600 .mmap = ceph_mmap, 2601 .fsync = ceph_fsync, 2602 .lock = ceph_lock, 2603 .setlease = simple_nosetlease, 2604 .flock = ceph_flock, 2605 .splice_read = generic_file_splice_read, 2606 .splice_write = iter_file_splice_write, 2607 .unlocked_ioctl = ceph_ioctl, 2608 .compat_ioctl = compat_ptr_ioctl, 2609 .fallocate = ceph_fallocate, 2610 .copy_file_range = ceph_copy_file_range, 2611 }; 2612