fs/ceph/file.c

   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(struct ceph_mds_client *mdsc, u32 flags)
  23 {
  24         struct ceph_client *cl = mdsc->fsc->client;
  25         u32 wire_flags = 0;
  26
  27         switch (flags & O_ACCMODE) {
  28         case O_RDONLY:
  29                 wire_flags |= CEPH_O_RDONLY;
  30                 break;
  31         case O_WRONLY:
  32                 wire_flags |= CEPH_O_WRONLY;
  33                 break;
  34         case O_RDWR:
  35                 wire_flags |= CEPH_O_RDWR;
  36                 break;
  37         }
  38
  39         flags &= ~O_ACCMODE;
  40
  41 #define ceph_sys2wire(a) if (flags & a) { wire_flags |= CEPH_##a; flags &= ~a; }
  42
  43         ceph_sys2wire(O_CREAT);
  44         ceph_sys2wire(O_EXCL);
  45         ceph_sys2wire(O_TRUNC);
  46         ceph_sys2wire(O_DIRECTORY);
  47         ceph_sys2wire(O_NOFOLLOW);
  48
  49 #undef ceph_sys2wire
  50
  51         if (flags)
  52                 doutc(cl, "unused open flags: %x\n", flags);
  53
  54         return cpu_to_le32(wire_flags);
  55 }
  56
  57 /*
  58  * Ceph file operations
  59  *
  60  * Implement basic open/close functionality, and implement
  61  * read/write.
  62  *
  63  * We implement three modes of file I/O:
  64  *  - buffered uses the generic_file_aio_{read,write} helpers
  65  *
  66  *  - synchronous is used when there is multi-client read/write
  67  *    sharing, avoids the page cache, and synchronously waits for an
  68  *    ack from the OSD.
  69  *
  70  *  - direct io takes the variant of the sync path that references
  71  *    user pages directly.
  72  *
  73  * fsync() flushes and waits on dirty pages, but just queues metadata
  74  * for writeback: since the MDS can recover size and mtime there is no
  75  * need to wait for MDS acknowledgement.
  76  */
  77
  78 /*
  79  * How many pages to get in one call to iov_iter_get_pages().  This
  80  * determines the size of the on-stack array used as a buffer.
  81  */
  82 #define ITER_GET_BVECS_PAGES    64
  83
  84 static ssize_t __iter_get_bvecs(struct iov_iter *iter, size_t maxsize,
  85                                 struct bio_vec *bvecs)
  86 {
  87         size_t size = 0;
  88         int bvec_idx = 0;
  89
  90         if (maxsize > iov_iter_count(iter))
  91                 maxsize = iov_iter_count(iter);
  92
  93         while (size < maxsize) {
  94                 struct page *pages[ITER_GET_BVECS_PAGES];
  95                 ssize_t bytes;
  96                 size_t start;
  97                 int idx = 0;
  98
  99                 bytes = iov_iter_get_pages2(iter, pages, maxsize - size,
 100                                            ITER_GET_BVECS_PAGES, &start);
 101                 if (bytes < 0)
 102                         return size ?: bytes;
 103
 104                 size += bytes;
 105
 106                 for ( ; bytes; idx++, bvec_idx++) {
 107                         int len = min_t(int, bytes, PAGE_SIZE - start);
 108
 109                         bvec_set_page(&bvecs[bvec_idx], pages[idx], len, start);
 110                         bytes -= len;
 111                         start = 0;
 112                 }
 113         }
 114
 115         return size;
 116 }
 117
 118 /*
 119  * iov_iter_get_pages() only considers one iov_iter segment, no matter
 120  * what maxsize or maxpages are given.  For ITER_BVEC that is a single
 121  * page.
 122  *
 123  * Attempt to get up to @maxsize bytes worth of pages from @iter.
 124  * Return the number of bytes in the created bio_vec array, or an error.
 125  */
 126 static ssize_t iter_get_bvecs_alloc(struct iov_iter *iter, size_t maxsize,
 127                                     struct bio_vec **bvecs, int *num_bvecs)
 128 {
 129         struct bio_vec *bv;
 130         size_t orig_count = iov_iter_count(iter);
 131         ssize_t bytes;
 132         int npages;
 133
 134         iov_iter_truncate(iter, maxsize);
 135         npages = iov_iter_npages(iter, INT_MAX);
 136         iov_iter_reexpand(iter, orig_count);
 137
 138         /*
 139          * __iter_get_bvecs() may populate only part of the array -- zero it
 140          * out.
 141          */
 142         bv = kvmalloc_array(npages, sizeof(*bv), GFP_KERNEL | __GFP_ZERO);
 143         if (!bv)
 144                 return -ENOMEM;
 145
 146         bytes = __iter_get_bvecs(iter, maxsize, bv);
 147         if (bytes < 0) {
 148                 /*
 149                  * No pages were pinned -- just free the array.
 150                  */
 151                 kvfree(bv);
 152                 return bytes;
 153         }
 154
 155         *bvecs = bv;
 156         *num_bvecs = npages;
 157         return bytes;
 158 }
 159
 160 static void put_bvecs(struct bio_vec *bvecs, int num_bvecs, bool should_dirty)
 161 {
 162         int i;
 163
 164         for (i = 0; i < num_bvecs; i++) {
 165                 if (bvecs[i].bv_page) {
 166                         if (should_dirty)
 167                                 set_page_dirty_lock(bvecs[i].bv_page);
 168                         put_page(bvecs[i].bv_page);
 169                 }
 170         }
 171         kvfree(bvecs);
 172 }
 173
 174 /*
 175  * Prepare an open request.  Preallocate ceph_cap to avoid an
 176  * inopportune ENOMEM later.
 177  */
 178 static struct ceph_mds_request *
 179 prepare_open_request(struct super_block *sb, int flags, int create_mode)
 180 {
 181         struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(sb);
 182         struct ceph_mds_request *req;
 183         int want_auth = USE_ANY_MDS;
 184         int op = (flags & O_CREAT) ? CEPH_MDS_OP_CREATE : CEPH_MDS_OP_OPEN;
 185
 186         if (flags & (O_WRONLY|O_RDWR|O_CREAT|O_TRUNC))
 187                 want_auth = USE_AUTH_MDS;
 188
 189         req = ceph_mdsc_create_request(mdsc, op, want_auth);
 190         if (IS_ERR(req))
 191                 goto out;
 192         req->r_fmode = ceph_flags_to_mode(flags);
 193         req->r_args.open.flags = ceph_flags_sys2wire(mdsc, flags);
 194         req->r_args.open.mode = cpu_to_le32(create_mode);
 195 out:
 196         return req;
 197 }
 198
 199 static int ceph_init_file_info(struct inode *inode, struct file *file,
 200                                         int fmode, bool isdir)
 201 {
 202         struct ceph_inode_info *ci = ceph_inode(inode);
 203         struct ceph_mount_options *opt =
 204                 ceph_inode_to_fs_client(&ci->netfs.inode)->mount_options;
 205         struct ceph_client *cl = ceph_inode_to_client(inode);
 206         struct ceph_file_info *fi;
 207         int ret;
 208
 209         doutc(cl, "%p %llx.%llx %p 0%o (%s)\n", inode, ceph_vinop(inode),
 210               file, inode->i_mode, isdir ? "dir" : "regular");
 211         BUG_ON(inode->i_fop->release != ceph_release);
 212
 213         if (isdir) {
 214                 struct ceph_dir_file_info *dfi =
 215                         kmem_cache_zalloc(ceph_dir_file_cachep, GFP_KERNEL);
 216                 if (!dfi)
 217                         return -ENOMEM;
 218
 219                 file->private_data = dfi;
 220                 fi = &dfi->file_info;
 221                 dfi->next_offset = 2;
 222                 dfi->readdir_cache_idx = -1;
 223         } else {
 224                 fi = kmem_cache_zalloc(ceph_file_cachep, GFP_KERNEL);
 225                 if (!fi)
 226                         return -ENOMEM;
 227
 228                 if (opt->flags & CEPH_MOUNT_OPT_NOPAGECACHE)
 229                         fi->flags |= CEPH_F_SYNC;
 230
 231                 file->private_data = fi;
 232         }
 233
 234         ceph_get_fmode(ci, fmode, 1);
 235         fi->fmode = fmode;
 236
 237         spin_lock_init(&fi->rw_contexts_lock);
 238         INIT_LIST_HEAD(&fi->rw_contexts);
 239         fi->filp_gen = READ_ONCE(ceph_inode_to_fs_client(inode)->filp_gen);
 240
 241         if ((file->f_mode & FMODE_WRITE) && ceph_has_inline_data(ci)) {
 242                 ret = ceph_uninline_data(file);
 243                 if (ret < 0)
 244                         goto error;
 245         }
 246
 247         return 0;
 248
 249 error:
 250         ceph_fscache_unuse_cookie(inode, file->f_mode & FMODE_WRITE);
 251         ceph_put_fmode(ci, fi->fmode, 1);
 252         kmem_cache_free(ceph_file_cachep, fi);
 253         /* wake up anyone waiting for caps on this inode */
 254         wake_up_all(&ci->i_cap_wq);
 255         return ret;
 256 }
 257
 258 /*
 259  * initialize private struct file data.
 260  * if we fail, clean up by dropping fmode reference on the ceph_inode
 261  */
 262 static int ceph_init_file(struct inode *inode, struct file *file, int fmode)
 263 {
 264         struct ceph_client *cl = ceph_inode_to_client(inode);
 265         int ret = 0;
 266
 267         switch (inode->i_mode & S_IFMT) {
 268         case S_IFREG:
 269                 ceph_fscache_use_cookie(inode, file->f_mode & FMODE_WRITE);
 270                 fallthrough;
 271         case S_IFDIR:
 272                 ret = ceph_init_file_info(inode, file, fmode,
 273                                                 S_ISDIR(inode->i_mode));
 274                 break;
 275
 276         case S_IFLNK:
 277                 doutc(cl, "%p %llx.%llx %p 0%o (symlink)\n", inode,
 278                       ceph_vinop(inode), file, inode->i_mode);
 279                 break;
 280
 281         default:
 282                 doutc(cl, "%p %llx.%llx %p 0%o (special)\n", inode,
 283                       ceph_vinop(inode), file, inode->i_mode);
 284                 /*
 285                  * we need to drop the open ref now, since we don't
 286                  * have .release set to ceph_release.
 287                  */
 288                 BUG_ON(inode->i_fop->release == ceph_release);
 289
 290                 /* call the proper open fop */
 291                 ret = inode->i_fop->open(inode, file);
 292         }
 293         return ret;
 294 }
 295
 296 /*
 297  * try renew caps after session gets killed.
 298  */
 299 int ceph_renew_caps(struct inode *inode, int fmode)
 300 {
 301         struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
 302         struct ceph_client *cl = mdsc->fsc->client;
 303         struct ceph_inode_info *ci = ceph_inode(inode);
 304         struct ceph_mds_request *req;
 305         int err, flags, wanted;
 306
 307         spin_lock(&ci->i_ceph_lock);
 308         __ceph_touch_fmode(ci, mdsc, fmode);
 309         wanted = __ceph_caps_file_wanted(ci);
 310         if (__ceph_is_any_real_caps(ci) &&
 311             (!(wanted & CEPH_CAP_ANY_WR) || ci->i_auth_cap)) {
 312                 int issued = __ceph_caps_issued(ci, NULL);
 313                 spin_unlock(&ci->i_ceph_lock);
 314                 doutc(cl, "%p %llx.%llx want %s issued %s updating mds_wanted\n",
 315                       inode, ceph_vinop(inode), ceph_cap_string(wanted),
 316                       ceph_cap_string(issued));
 317                 ceph_check_caps(ci, 0);
 318                 return 0;
 319         }
 320         spin_unlock(&ci->i_ceph_lock);
 321
 322         flags = 0;
 323         if ((wanted & CEPH_CAP_FILE_RD) && (wanted & CEPH_CAP_FILE_WR))
 324                 flags = O_RDWR;
 325         else if (wanted & CEPH_CAP_FILE_RD)
 326                 flags = O_RDONLY;
 327         else if (wanted & CEPH_CAP_FILE_WR)
 328                 flags = O_WRONLY;
 329 #ifdef O_LAZY
 330         if (wanted & CEPH_CAP_FILE_LAZYIO)
 331                 flags |= O_LAZY;
 332 #endif
 333
 334         req = prepare_open_request(inode->i_sb, flags, 0);
 335         if (IS_ERR(req)) {
 336                 err = PTR_ERR(req);
 337                 goto out;
 338         }
 339
 340         req->r_inode = inode;
 341         ihold(inode);
 342         req->r_num_caps = 1;
 343
 344         err = ceph_mdsc_do_request(mdsc, NULL, req);
 345         ceph_mdsc_put_request(req);
 346 out:
 347         doutc(cl, "%p %llx.%llx open result=%d\n", inode, ceph_vinop(inode),
 348               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_fs_client(inode->i_sb);
 362         struct ceph_client *cl = fsc->client;
 363         struct ceph_mds_client *mdsc = fsc->mdsc;
 364         struct ceph_mds_request *req;
 365         struct ceph_file_info *fi = file->private_data;
 366         int err;
 367         int flags, fmode, wanted;
 368
 369         if (fi) {
 370                 doutc(cl, "file %p is already opened\n", file);
 371                 return 0;
 372         }
 373
 374         /* filter out O_CREAT|O_EXCL; vfs did that already.  yuck. */
 375         flags = file->f_flags & ~(O_CREAT|O_EXCL);
 376         if (S_ISDIR(inode->i_mode)) {
 377                 flags = O_DIRECTORY;  /* mds likes to know */
 378         } else if (S_ISREG(inode->i_mode)) {
 379                 err = fscrypt_file_open(inode, file);
 380                 if (err)
 381                         return err;
 382         }
 383
 384         doutc(cl, "%p %llx.%llx file %p flags %d (%d)\n", inode,
 385               ceph_vinop(inode), file, flags, file->f_flags);
 386         fmode = ceph_flags_to_mode(flags);
 387         wanted = ceph_caps_for_mode(fmode);
 388
 389         /* snapped files are read-only */
 390         if (ceph_snap(inode) != CEPH_NOSNAP && (file->f_mode & FMODE_WRITE))
 391                 return -EROFS;
 392
 393         /* trivially open snapdir */
 394         if (ceph_snap(inode) == CEPH_SNAPDIR) {
 395                 return ceph_init_file(inode, file, fmode);
 396         }
 397
 398         /*
 399          * No need to block if we have caps on the auth MDS (for
 400          * write) or any MDS (for read).  Update wanted set
 401          * asynchronously.
 402          */
 403         spin_lock(&ci->i_ceph_lock);
 404         if (__ceph_is_any_real_caps(ci) &&
 405             (((fmode & CEPH_FILE_MODE_WR) == 0) || ci->i_auth_cap)) {
 406                 int mds_wanted = __ceph_caps_mds_wanted(ci, true);
 407                 int issued = __ceph_caps_issued(ci, NULL);
 408
 409                 doutc(cl, "open %p fmode %d want %s issued %s using existing\n",
 410                       inode, fmode, ceph_cap_string(wanted),
 411                       ceph_cap_string(issued));
 412                 __ceph_touch_fmode(ci, mdsc, fmode);
 413                 spin_unlock(&ci->i_ceph_lock);
 414
 415                 /* adjust wanted? */
 416                 if ((issued & wanted) != wanted &&
 417                     (mds_wanted & wanted) != wanted &&
 418                     ceph_snap(inode) != CEPH_SNAPDIR)
 419                         ceph_check_caps(ci, 0);
 420
 421                 return ceph_init_file(inode, file, fmode);
 422         } else if (ceph_snap(inode) != CEPH_NOSNAP &&
 423                    (ci->i_snap_caps & wanted) == wanted) {
 424                 __ceph_touch_fmode(ci, mdsc, fmode);
 425                 spin_unlock(&ci->i_ceph_lock);
 426                 return ceph_init_file(inode, file, fmode);
 427         }
 428
 429         spin_unlock(&ci->i_ceph_lock);
 430
 431         doutc(cl, "open fmode %d wants %s\n", fmode, ceph_cap_string(wanted));
 432         req = prepare_open_request(inode->i_sb, flags, 0);
 433         if (IS_ERR(req)) {
 434                 err = PTR_ERR(req);
 435                 goto out;
 436         }
 437         req->r_inode = inode;
 438         ihold(inode);
 439
 440         req->r_num_caps = 1;
 441         err = ceph_mdsc_do_request(mdsc, NULL, req);
 442         if (!err)
 443                 err = ceph_init_file(inode, file, req->r_fmode);
 444         ceph_mdsc_put_request(req);
 445         doutc(cl, "open result=%d on %llx.%llx\n", err, ceph_vinop(inode));
 446 out:
 447         return err;
 448 }
 449
 450 /* Clone the layout from a synchronous create, if the dir now has Dc caps */
 451 static void
 452 cache_file_layout(struct inode *dst, struct inode *src)
 453 {
 454         struct ceph_inode_info *cdst = ceph_inode(dst);
 455         struct ceph_inode_info *csrc = ceph_inode(src);
 456
 457         spin_lock(&cdst->i_ceph_lock);
 458         if ((__ceph_caps_issued(cdst, NULL) & CEPH_CAP_DIR_CREATE) &&
 459             !ceph_file_layout_is_valid(&cdst->i_cached_layout)) {
 460                 memcpy(&cdst->i_cached_layout, &csrc->i_layout,
 461                         sizeof(cdst->i_cached_layout));
 462                 rcu_assign_pointer(cdst->i_cached_layout.pool_ns,
 463                                    ceph_try_get_string(csrc->i_layout.pool_ns));
 464         }
 465         spin_unlock(&cdst->i_ceph_lock);
 466 }
 467
 468 /*
 469  * Try to set up an async create. We need caps, a file layout, and inode number,
 470  * and either a lease on the dentry or complete dir info. If any of those
 471  * criteria are not satisfied, then return false and the caller can go
 472  * synchronous.
 473  */
 474 static int try_prep_async_create(struct inode *dir, struct dentry *dentry,
 475                                  struct ceph_file_layout *lo, u64 *pino)
 476 {
 477         struct ceph_inode_info *ci = ceph_inode(dir);
 478         struct ceph_dentry_info *di = ceph_dentry(dentry);
 479         int got = 0, want = CEPH_CAP_FILE_EXCL | CEPH_CAP_DIR_CREATE;
 480         u64 ino;
 481
 482         spin_lock(&ci->i_ceph_lock);
 483         /* No auth cap means no chance for Dc caps */
 484         if (!ci->i_auth_cap)
 485                 goto no_async;
 486
 487         /* Any delegated inos? */
 488         if (xa_empty(&ci->i_auth_cap->session->s_delegated_inos))
 489                 goto no_async;
 490
 491         if (!ceph_file_layout_is_valid(&ci->i_cached_layout))
 492                 goto no_async;
 493
 494         if ((__ceph_caps_issued(ci, NULL) & want) != want)
 495                 goto no_async;
 496
 497         if (d_in_lookup(dentry)) {
 498                 if (!__ceph_dir_is_complete(ci))
 499                         goto no_async;
 500                 spin_lock(&dentry->d_lock);
 501                 di->lease_shared_gen = atomic_read(&ci->i_shared_gen);
 502                 spin_unlock(&dentry->d_lock);
 503         } else if (atomic_read(&ci->i_shared_gen) !=
 504                    READ_ONCE(di->lease_shared_gen)) {
 505                 goto no_async;
 506         }
 507
 508         ino = ceph_get_deleg_ino(ci->i_auth_cap->session);
 509         if (!ino)
 510                 goto no_async;
 511
 512         *pino = ino;
 513         ceph_take_cap_refs(ci, want, false);
 514         memcpy(lo, &ci->i_cached_layout, sizeof(*lo));
 515         rcu_assign_pointer(lo->pool_ns,
 516                            ceph_try_get_string(ci->i_cached_layout.pool_ns));
 517         got = want;
 518 no_async:
 519         spin_unlock(&ci->i_ceph_lock);
 520         return got;
 521 }
 522
 523 static void restore_deleg_ino(struct inode *dir, u64 ino)
 524 {
 525         struct ceph_client *cl = ceph_inode_to_client(dir);
 526         struct ceph_inode_info *ci = ceph_inode(dir);
 527         struct ceph_mds_session *s = NULL;
 528
 529         spin_lock(&ci->i_ceph_lock);
 530         if (ci->i_auth_cap)
 531                 s = ceph_get_mds_session(ci->i_auth_cap->session);
 532         spin_unlock(&ci->i_ceph_lock);
 533         if (s) {
 534                 int err = ceph_restore_deleg_ino(s, ino);
 535                 if (err)
 536                         pr_warn_client(cl,
 537                                 "unable to restore delegated ino 0x%llx to session: %d\n",
 538                                 ino, err);
 539                 ceph_put_mds_session(s);
 540         }
 541 }
 542
 543 static void wake_async_create_waiters(struct inode *inode,
 544                                       struct ceph_mds_session *session)
 545 {
 546         struct ceph_inode_info *ci = ceph_inode(inode);
 547         bool check_cap = false;
 548
 549         spin_lock(&ci->i_ceph_lock);
 550         if (ci->i_ceph_flags & CEPH_I_ASYNC_CREATE) {
 551                 ci->i_ceph_flags &= ~CEPH_I_ASYNC_CREATE;
 552                 wake_up_bit(&ci->i_ceph_flags, CEPH_ASYNC_CREATE_BIT);
 553
 554                 if (ci->i_ceph_flags & CEPH_I_ASYNC_CHECK_CAPS) {
 555                         ci->i_ceph_flags &= ~CEPH_I_ASYNC_CHECK_CAPS;
 556                         check_cap = true;
 557                 }
 558         }
 559         ceph_kick_flushing_inode_caps(session, ci);
 560         spin_unlock(&ci->i_ceph_lock);
 561
 562         if (check_cap)
 563                 ceph_check_caps(ci, CHECK_CAPS_FLUSH);
 564 }
 565
 566 static void ceph_async_create_cb(struct ceph_mds_client *mdsc,
 567                                  struct ceph_mds_request *req)
 568 {
 569         struct ceph_client *cl = mdsc->fsc->client;
 570         struct dentry *dentry = req->r_dentry;
 571         struct inode *dinode = d_inode(dentry);
 572         struct inode *tinode = req->r_target_inode;
 573         int result = req->r_err ? req->r_err :
 574                         le32_to_cpu(req->r_reply_info.head->result);
 575
 576         WARN_ON_ONCE(dinode && tinode && dinode != tinode);
 577
 578         /* MDS changed -- caller must resubmit */
 579         if (result == -EJUKEBOX)
 580                 goto out;
 581
 582         mapping_set_error(req->r_parent->i_mapping, result);
 583
 584         if (result) {
 585                 int pathlen = 0;
 586                 u64 base = 0;
 587                 char *path = ceph_mdsc_build_path(mdsc, req->r_dentry, &pathlen,
 588                                                   &base, 0);
 589
 590                 pr_warn_client(cl,
 591                         "async create failure path=(%llx)%s result=%d!\n",
 592                         base, IS_ERR(path) ? "<<bad>>" : path, result);
 593                 ceph_mdsc_free_path(path, pathlen);
 594
 595                 ceph_dir_clear_complete(req->r_parent);
 596                 if (!d_unhashed(dentry))
 597                         d_drop(dentry);
 598
 599                 if (dinode) {
 600                         mapping_set_error(dinode->i_mapping, result);
 601                         ceph_inode_shutdown(dinode);
 602                         wake_async_create_waiters(dinode, req->r_session);
 603                 }
 604         }
 605
 606         if (tinode) {
 607                 u64 ino = ceph_vino(tinode).ino;
 608
 609                 if (req->r_deleg_ino != ino)
 610                         pr_warn_client(cl,
 611                                 "inode number mismatch! err=%d deleg_ino=0x%llx target=0x%llx\n",
 612                                 req->r_err, req->r_deleg_ino, ino);
 613
 614                 mapping_set_error(tinode->i_mapping, result);
 615                 wake_async_create_waiters(tinode, req->r_session);
 616         } else if (!result) {
 617                 pr_warn_client(cl, "no req->r_target_inode for 0x%llx\n",
 618                                req->r_deleg_ino);
 619         }
 620 out:
 621         ceph_mdsc_release_dir_caps(req);
 622 }
 623
 624 static int ceph_finish_async_create(struct inode *dir, struct inode *inode,
 625                                     struct dentry *dentry,
 626                                     struct file *file, umode_t mode,
 627                                     struct ceph_mds_request *req,
 628                                     struct ceph_acl_sec_ctx *as_ctx,
 629                                     struct ceph_file_layout *lo)
 630 {
 631         int ret;
 632         char xattr_buf[4];
 633         struct ceph_mds_reply_inode in = { };
 634         struct ceph_mds_reply_info_in iinfo = { .in = &in };
 635         struct ceph_inode_info *ci = ceph_inode(dir);
 636         struct ceph_dentry_info *di = ceph_dentry(dentry);
 637         struct timespec64 now;
 638         struct ceph_string *pool_ns;
 639         struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb);
 640         struct ceph_client *cl = mdsc->fsc->client;
 641         struct ceph_vino vino = { .ino = req->r_deleg_ino,
 642                                   .snap = CEPH_NOSNAP };
 643
 644         ktime_get_real_ts64(&now);
 645
 646         iinfo.inline_version = CEPH_INLINE_NONE;
 647         iinfo.change_attr = 1;
 648         ceph_encode_timespec64(&iinfo.btime, &now);
 649
 650         if (req->r_pagelist) {
 651                 iinfo.xattr_len = req->r_pagelist->length;
 652                 iinfo.xattr_data = req->r_pagelist->mapped_tail;
 653         } else {
 654                 /* fake it */
 655                 iinfo.xattr_len = ARRAY_SIZE(xattr_buf);
 656                 iinfo.xattr_data = xattr_buf;
 657                 memset(iinfo.xattr_data, 0, iinfo.xattr_len);
 658         }
 659
 660         in.ino = cpu_to_le64(vino.ino);
 661         in.snapid = cpu_to_le64(CEPH_NOSNAP);
 662         in.version = cpu_to_le64(1);    // ???
 663         in.cap.caps = in.cap.wanted = cpu_to_le32(CEPH_CAP_ALL_FILE);
 664         in.cap.cap_id = cpu_to_le64(1);
 665         in.cap.realm = cpu_to_le64(ci->i_snap_realm->ino);
 666         in.cap.flags = CEPH_CAP_FLAG_AUTH;
 667         in.ctime = in.mtime = in.atime = iinfo.btime;
 668         in.truncate_seq = cpu_to_le32(1);
 669         in.truncate_size = cpu_to_le64(-1ULL);
 670         in.xattr_version = cpu_to_le64(1);
 671         in.uid = cpu_to_le32(from_kuid(&init_user_ns,
 672                                        mapped_fsuid(req->r_mnt_idmap,
 673                                                     &init_user_ns)));
 674         if (dir->i_mode & S_ISGID) {
 675                 in.gid = cpu_to_le32(from_kgid(&init_user_ns, dir->i_gid));
 676
 677                 /* Directories always inherit the setgid bit. */
 678                 if (S_ISDIR(mode))
 679                         mode |= S_ISGID;
 680         } else {
 681                 in.gid = cpu_to_le32(from_kgid(&init_user_ns,
 682                                      mapped_fsgid(req->r_mnt_idmap,
 683                                                   &init_user_ns)));
 684         }
 685         in.mode = cpu_to_le32((u32)mode);
 686
 687         in.nlink = cpu_to_le32(1);
 688         in.max_size = cpu_to_le64(lo->stripe_unit);
 689
 690         ceph_file_layout_to_legacy(lo, &in.layout);
 691         /* lo is private, so pool_ns can't change */
 692         pool_ns = rcu_dereference_raw(lo->pool_ns);
 693         if (pool_ns) {
 694                 iinfo.pool_ns_len = pool_ns->len;
 695                 iinfo.pool_ns_data = pool_ns->str;
 696         }
 697
 698         down_read(&mdsc->snap_rwsem);
 699         ret = ceph_fill_inode(inode, NULL, &iinfo, NULL, req->r_session,
 700                               req->r_fmode, NULL);
 701         up_read(&mdsc->snap_rwsem);
 702         if (ret) {
 703                 doutc(cl, "failed to fill inode: %d\n", ret);
 704                 ceph_dir_clear_complete(dir);
 705                 if (!d_unhashed(dentry))
 706                         d_drop(dentry);
 707                 discard_new_inode(inode);
 708         } else {
 709                 struct dentry *dn;
 710
 711                 doutc(cl, "d_adding new inode 0x%llx to 0x%llx/%s\n",
 712                       vino.ino, ceph_ino(dir), dentry->d_name.name);
 713                 ceph_dir_clear_ordered(dir);
 714                 ceph_init_inode_acls(inode, as_ctx);
 715                 if (inode->i_state & I_NEW) {
 716                         /*
 717                          * If it's not I_NEW, then someone created this before
 718                          * we got here. Assume the server is aware of it at
 719                          * that point and don't worry about setting
 720                          * CEPH_I_ASYNC_CREATE.
 721                          */
 722                         ceph_inode(inode)->i_ceph_flags = CEPH_I_ASYNC_CREATE;
 723                         unlock_new_inode(inode);
 724                 }
 725                 if (d_in_lookup(dentry) || d_really_is_negative(dentry)) {
 726                         if (!d_unhashed(dentry))
 727                                 d_drop(dentry);
 728                         dn = d_splice_alias(inode, dentry);
 729                         WARN_ON_ONCE(dn && dn != dentry);
 730                 }
 731                 file->f_mode |= FMODE_CREATED;
 732                 ret = finish_open(file, dentry, ceph_open);
 733         }
 734
 735         spin_lock(&dentry->d_lock);
 736         di->flags &= ~CEPH_DENTRY_ASYNC_CREATE;
 737         wake_up_bit(&di->flags, CEPH_DENTRY_ASYNC_CREATE_BIT);
 738         spin_unlock(&dentry->d_lock);
 739
 740         return ret;
 741 }
 742
 743 /*
 744  * Do a lookup + open with a single request.  If we get a non-existent
 745  * file or symlink, return 1 so the VFS can retry.
 746  */
 747 int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
 748                      struct file *file, unsigned flags, umode_t mode)
 749 {
 750         struct mnt_idmap *idmap = file_mnt_idmap(file);
 751         struct ceph_fs_client *fsc = ceph_sb_to_fs_client(dir->i_sb);
 752         struct ceph_client *cl = fsc->client;
 753         struct ceph_mds_client *mdsc = fsc->mdsc;
 754         struct ceph_mds_request *req;
 755         struct inode *new_inode = NULL;
 756         struct dentry *dn;
 757         struct ceph_acl_sec_ctx as_ctx = {};
 758         bool try_async = ceph_test_mount_opt(fsc, ASYNC_DIROPS);
 759         int mask;
 760         int err;
 761
 762         doutc(cl, "%p %llx.%llx dentry %p '%pd' %s flags %d mode 0%o\n",
 763               dir, ceph_vinop(dir), dentry, dentry,
 764               d_unhashed(dentry) ? "unhashed" : "hashed", flags, mode);
 765
 766         if (dentry->d_name.len > NAME_MAX)
 767                 return -ENAMETOOLONG;
 768
 769         err = ceph_wait_on_conflict_unlink(dentry);
 770         if (err)
 771                 return err;
 772         /*
 773          * Do not truncate the file, since atomic_open is called before the
 774          * permission check. The caller will do the truncation afterward.
 775          */
 776         flags &= ~O_TRUNC;
 777
 778 retry:
 779         if (flags & O_CREAT) {
 780                 if (ceph_quota_is_max_files_exceeded(dir))
 781                         return -EDQUOT;
 782
 783                 new_inode = ceph_new_inode(dir, dentry, &mode, &as_ctx);
 784                 if (IS_ERR(new_inode)) {
 785                         err = PTR_ERR(new_inode);
 786                         goto out_ctx;
 787                 }
 788                 /* Async create can't handle more than a page of xattrs */
 789                 if (as_ctx.pagelist &&
 790                     !list_is_singular(&as_ctx.pagelist->head))
 791                         try_async = false;
 792         } else if (!d_in_lookup(dentry)) {
 793                 /* If it's not being looked up, it's negative */
 794                 return -ENOENT;
 795         }
 796
 797         /* do the open */
 798         req = prepare_open_request(dir->i_sb, flags, mode);
 799         if (IS_ERR(req)) {
 800                 err = PTR_ERR(req);
 801                 goto out_ctx;
 802         }
 803         req->r_dentry = dget(dentry);
 804         req->r_num_caps = 2;
 805         mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
 806         if (ceph_security_xattr_wanted(dir))
 807                 mask |= CEPH_CAP_XATTR_SHARED;
 808         req->r_args.open.mask = cpu_to_le32(mask);
 809         req->r_parent = dir;
 810         if (req->r_op == CEPH_MDS_OP_CREATE)
 811                 req->r_mnt_idmap = mnt_idmap_get(idmap);
 812         ihold(dir);
 813         if (IS_ENCRYPTED(dir)) {
 814                 set_bit(CEPH_MDS_R_FSCRYPT_FILE, &req->r_req_flags);
 815                 err = fscrypt_prepare_lookup_partial(dir, dentry);
 816                 if (err < 0)
 817                         goto out_req;
 818         }
 819
 820         if (flags & O_CREAT) {
 821                 struct ceph_file_layout lo;
 822
 823                 req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL |
 824                                      CEPH_CAP_XATTR_EXCL;
 825                 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
 826
 827                 ceph_as_ctx_to_req(req, &as_ctx);
 828
 829                 if (try_async && (req->r_dir_caps =
 830                                   try_prep_async_create(dir, dentry, &lo,
 831                                                         &req->r_deleg_ino))) {
 832                         struct ceph_vino vino = { .ino = req->r_deleg_ino,
 833                                                   .snap = CEPH_NOSNAP };
 834                         struct ceph_dentry_info *di = ceph_dentry(dentry);
 835
 836                         set_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags);
 837                         req->r_args.open.flags |= cpu_to_le32(CEPH_O_EXCL);
 838                         req->r_callback = ceph_async_create_cb;
 839
 840                         /* Hash inode before RPC */
 841                         new_inode = ceph_get_inode(dir->i_sb, vino, new_inode);
 842                         if (IS_ERR(new_inode)) {
 843                                 err = PTR_ERR(new_inode);
 844                                 new_inode = NULL;
 845                                 goto out_req;
 846                         }
 847                         WARN_ON_ONCE(!(new_inode->i_state & I_NEW));
 848
 849                         spin_lock(&dentry->d_lock);
 850                         di->flags |= CEPH_DENTRY_ASYNC_CREATE;
 851                         spin_unlock(&dentry->d_lock);
 852
 853                         err = ceph_mdsc_submit_request(mdsc, dir, req);
 854                         if (!err) {
 855                                 err = ceph_finish_async_create(dir, new_inode,
 856                                                                dentry, file,
 857                                                                mode, req,
 858                                                                &as_ctx, &lo);
 859                                 new_inode = NULL;
 860                         } else if (err == -EJUKEBOX) {
 861                                 restore_deleg_ino(dir, req->r_deleg_ino);
 862                                 ceph_mdsc_put_request(req);
 863                                 discard_new_inode(new_inode);
 864                                 ceph_release_acl_sec_ctx(&as_ctx);
 865                                 memset(&as_ctx, 0, sizeof(as_ctx));
 866                                 new_inode = NULL;
 867                                 try_async = false;
 868                                 ceph_put_string(rcu_dereference_raw(lo.pool_ns));
 869                                 goto retry;
 870                         }
 871                         ceph_put_string(rcu_dereference_raw(lo.pool_ns));
 872                         goto out_req;
 873                 }
 874         }
 875
 876         set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
 877         req->r_new_inode = new_inode;
 878         new_inode = NULL;
 879         err = ceph_mdsc_do_request(mdsc, (flags & O_CREAT) ? dir : NULL, req);
 880         if (err == -ENOENT) {
 881                 dentry = ceph_handle_snapdir(req, dentry);
 882                 if (IS_ERR(dentry)) {
 883                         err = PTR_ERR(dentry);
 884                         goto out_req;
 885                 }
 886                 err = 0;
 887         }
 888
 889         if (!err && (flags & O_CREAT) && !req->r_reply_info.head->is_dentry)
 890                 err = ceph_handle_notrace_create(dir, dentry);
 891
 892         if (d_in_lookup(dentry)) {
 893                 dn = ceph_finish_lookup(req, dentry, err);
 894                 if (IS_ERR(dn))
 895                         err = PTR_ERR(dn);
 896         } else {
 897                 /* we were given a hashed negative dentry */
 898                 dn = NULL;
 899         }
 900         if (err)
 901                 goto out_req;
 902         if (dn || d_really_is_negative(dentry) || d_is_symlink(dentry)) {
 903                 /* make vfs retry on splice, ENOENT, or symlink */
 904                 doutc(cl, "finish_no_open on dn %p\n", dn);
 905                 err = finish_no_open(file, dn);
 906         } else {
 907                 if (IS_ENCRYPTED(dir) &&
 908                     !fscrypt_has_permitted_context(dir, d_inode(dentry))) {
 909                         pr_warn_client(cl,
 910                                 "Inconsistent encryption context (parent %llx:%llx child %llx:%llx)\n",
 911                                 ceph_vinop(dir), ceph_vinop(d_inode(dentry)));
 912                         goto out_req;
 913                 }
 914
 915                 doutc(cl, "finish_open on dn %p\n", dn);
 916                 if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) {
 917                         struct inode *newino = d_inode(dentry);
 918
 919                         cache_file_layout(dir, newino);
 920                         ceph_init_inode_acls(newino, &as_ctx);
 921                         file->f_mode |= FMODE_CREATED;
 922                 }
 923                 err = finish_open(file, dentry, ceph_open);
 924         }
 925 out_req:
 926         ceph_mdsc_put_request(req);
 927         iput(new_inode);
 928 out_ctx:
 929         ceph_release_acl_sec_ctx(&as_ctx);
 930         doutc(cl, "result=%d\n", err);
 931         return err;
 932 }
 933
 934 int ceph_release(struct inode *inode, struct file *file)
 935 {
 936         struct ceph_client *cl = ceph_inode_to_client(inode);
 937         struct ceph_inode_info *ci = ceph_inode(inode);
 938
 939         if (S_ISDIR(inode->i_mode)) {
 940                 struct ceph_dir_file_info *dfi = file->private_data;
 941                 doutc(cl, "%p %llx.%llx dir file %p\n", inode,
 942                       ceph_vinop(inode), file);
 943                 WARN_ON(!list_empty(&dfi->file_info.rw_contexts));
 944
 945                 ceph_put_fmode(ci, dfi->file_info.fmode, 1);
 946
 947                 if (dfi->last_readdir)
 948                         ceph_mdsc_put_request(dfi->last_readdir);
 949                 kfree(dfi->last_name);
 950                 kfree(dfi->dir_info);
 951                 kmem_cache_free(ceph_dir_file_cachep, dfi);
 952         } else {
 953                 struct ceph_file_info *fi = file->private_data;
 954                 doutc(cl, "%p %llx.%llx regular file %p\n", inode,
 955                       ceph_vinop(inode), file);
 956                 WARN_ON(!list_empty(&fi->rw_contexts));
 957
 958                 ceph_fscache_unuse_cookie(inode, file->f_mode & FMODE_WRITE);
 959                 ceph_put_fmode(ci, fi->fmode, 1);
 960
 961                 kmem_cache_free(ceph_file_cachep, fi);
 962         }
 963
 964         /* wake up anyone waiting for caps on this inode */
 965         wake_up_all(&ci->i_cap_wq);
 966         return 0;
 967 }
 968
 969 enum {
 970         HAVE_RETRIED = 1,
 971         CHECK_EOF =    2,
 972         READ_INLINE =  3,
 973 };
 974
 975 /*
 976  * Completely synchronous read and write methods.  Direct from __user
 977  * buffer to osd, or directly to user pages (if O_DIRECT).
 978  *
 979  * If the read spans object boundary, just do multiple reads.  (That's not
 980  * atomic, but good enough for now.)
 981  *
 982  * If we get a short result from the OSD, check against i_size; we need to
 983  * only return a short read to the caller if we hit EOF.
 984  */
 985 ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos,
 986                          struct iov_iter *to, int *retry_op,
 987                          u64 *last_objver)
 988 {
 989         struct ceph_inode_info *ci = ceph_inode(inode);
 990         struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
 991         struct ceph_client *cl = fsc->client;
 992         struct ceph_osd_client *osdc = &fsc->client->osdc;
 993         ssize_t ret;
 994         u64 off = *ki_pos;
 995         u64 len = iov_iter_count(to);
 996         u64 i_size = i_size_read(inode);
 997         bool sparse = IS_ENCRYPTED(inode) || ceph_test_mount_opt(fsc, SPARSEREAD);
 998         u64 objver = 0;
 999
1000         doutc(cl, "on inode %p %llx.%llx %llx~%llx\n", inode,
1001               ceph_vinop(inode), *ki_pos, len);
1002
1003         if (ceph_inode_is_shutdown(inode))
1004                 return -EIO;
1005
1006         if (!len)
1007                 return 0;
1008         /*
1009          * flush any page cache pages in this range.  this
1010          * will make concurrent normal and sync io slow,
1011          * but it will at least behave sensibly when they are
1012          * in sequence.
1013          */
1014         ret = filemap_write_and_wait_range(inode->i_mapping,
1015                                            off, off + len - 1);
1016         if (ret < 0)
1017                 return ret;
1018
1019         ret = 0;
1020         while ((len = iov_iter_count(to)) > 0) {
1021                 struct ceph_osd_request *req;
1022                 struct page **pages;
1023                 int num_pages;
1024                 size_t page_off;
1025                 bool more;
1026                 int idx;
1027                 size_t left;
1028                 struct ceph_osd_req_op *op;
1029                 u64 read_off = off;
1030                 u64 read_len = len;
1031
1032                 /* determine new offset/length if encrypted */
1033                 ceph_fscrypt_adjust_off_and_len(inode, &read_off, &read_len);
1034
1035                 doutc(cl, "orig %llu~%llu reading %llu~%llu", off, len,
1036                       read_off, read_len);
1037
1038                 req = ceph_osdc_new_request(osdc, &ci->i_layout,
1039                                         ci->i_vino, read_off, &read_len, 0, 1,
1040                                         sparse ? CEPH_OSD_OP_SPARSE_READ :
1041                                                  CEPH_OSD_OP_READ,
1042                                         CEPH_OSD_FLAG_READ,
1043                                         NULL, ci->i_truncate_seq,
1044                                         ci->i_truncate_size, false);
1045                 if (IS_ERR(req)) {
1046                         ret = PTR_ERR(req);
1047                         break;
1048                 }
1049
1050                 /* adjust len downward if the request truncated the len */
1051                 if (off + len > read_off + read_len)
1052                         len = read_off + read_len - off;
1053                 more = len < iov_iter_count(to);
1054
1055                 num_pages = calc_pages_for(read_off, read_len);
1056                 page_off = offset_in_page(off);
1057                 pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
1058                 if (IS_ERR(pages)) {
1059                         ceph_osdc_put_request(req);
1060                         ret = PTR_ERR(pages);
1061                         break;
1062                 }
1063
1064                 osd_req_op_extent_osd_data_pages(req, 0, pages, read_len,
1065                                                  offset_in_page(read_off),
1066                                                  false, false);
1067
1068                 op = &req->r_ops[0];
1069                 if (sparse) {
1070                         ret = ceph_alloc_sparse_ext_map(op);
1071                         if (ret) {
1072                                 ceph_osdc_put_request(req);
1073                                 break;
1074                         }
1075                 }
1076
1077                 ceph_osdc_start_request(osdc, req);
1078                 ret = ceph_osdc_wait_request(osdc, req);
1079
1080                 ceph_update_read_metrics(&fsc->mdsc->metric,
1081                                          req->r_start_latency,
1082                                          req->r_end_latency,
1083                                          read_len, ret);
1084
1085                 if (ret > 0)
1086                         objver = req->r_version;
1087
1088                 i_size = i_size_read(inode);
1089                 doutc(cl, "%llu~%llu got %zd i_size %llu%s\n", off, len,
1090                       ret, i_size, (more ? " MORE" : ""));
1091
1092                 /* Fix it to go to end of extent map */
1093                 if (sparse && ret >= 0)
1094                         ret = ceph_sparse_ext_map_end(op);
1095                 else if (ret == -ENOENT)
1096                         ret = 0;
1097
1098                 if (ret > 0 && IS_ENCRYPTED(inode)) {
1099                         int fret;
1100
1101                         fret = ceph_fscrypt_decrypt_extents(inode, pages,
1102                                         read_off, op->extent.sparse_ext,
1103                                         op->extent.sparse_ext_cnt);
1104                         if (fret < 0) {
1105                                 ret = fret;
1106                                 ceph_osdc_put_request(req);
1107                                 break;
1108                         }
1109
1110                         /* account for any partial block at the beginning */
1111                         fret -= (off - read_off);
1112
1113                         /*
1114                          * Short read after big offset adjustment?
1115                          * Nothing is usable, just call it a zero
1116                          * len read.
1117                          */
1118                         fret = max(fret, 0);
1119
1120                         /* account for partial block at the end */
1121                         ret = min_t(ssize_t, fret, len);
1122                 }
1123
1124                 ceph_osdc_put_request(req);
1125
1126                 /* Short read but not EOF? Zero out the remainder. */
1127                 if (ret >= 0 && ret < len && (off + ret < i_size)) {
1128                         int zlen = min(len - ret, i_size - off - ret);
1129                         int zoff = page_off + ret;
1130
1131                         doutc(cl, "zero gap %llu~%llu\n", off + ret,
1132                               off + ret + zlen);
1133                         ceph_zero_page_vector_range(zoff, zlen, pages);
1134                         ret += zlen;
1135                 }
1136
1137                 idx = 0;
1138                 left = ret > 0 ? ret : 0;
1139                 while (left > 0) {
1140                         size_t plen, copied;
1141
1142                         plen = min_t(size_t, left, PAGE_SIZE - page_off);
1143                         SetPageUptodate(pages[idx]);
1144                         copied = copy_page_to_iter(pages[idx++],
1145                                                    page_off, plen, to);
1146                         off += copied;
1147                         left -= copied;
1148                         page_off = 0;
1149                         if (copied < plen) {
1150                                 ret = -EFAULT;
1151                                 break;
1152                         }
1153                 }
1154                 ceph_release_page_vector(pages, num_pages);
1155
1156                 if (ret < 0) {
1157                         if (ret == -EBLOCKLISTED)
1158                                 fsc->blocklisted = true;
1159                         break;
1160                 }
1161
1162                 if (off >= i_size || !more)
1163                         break;
1164         }
1165
1166         if (ret > 0) {
1167                 if (off > *ki_pos) {
1168                         if (off >= i_size) {
1169                                 *retry_op = CHECK_EOF;
1170                                 ret = i_size - *ki_pos;
1171                                 *ki_pos = i_size;
1172                         } else {
1173                                 ret = off - *ki_pos;
1174                                 *ki_pos = off;
1175                         }
1176                 }
1177
1178                 if (last_objver)
1179                         *last_objver = objver;
1180         }
1181         doutc(cl, "result %zd retry_op %d\n", ret, *retry_op);
1182         return ret;
1183 }
1184
1185 static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *to,
1186                               int *retry_op)
1187 {
1188         struct file *file = iocb->ki_filp;
1189         struct inode *inode = file_inode(file);
1190         struct ceph_client *cl = ceph_inode_to_client(inode);
1191
1192         doutc(cl, "on file %p %llx~%zx %s\n", file, iocb->ki_pos,
1193               iov_iter_count(to),
1194               (file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
1195
1196         return __ceph_sync_read(inode, &iocb->ki_pos, to, retry_op, NULL);
1197 }
1198
1199 struct ceph_aio_request {
1200         struct kiocb *iocb;
1201         size_t total_len;
1202         bool write;
1203         bool should_dirty;
1204         int error;
1205         struct list_head osd_reqs;
1206         unsigned num_reqs;
1207         atomic_t pending_reqs;
1208         struct timespec64 mtime;
1209         struct ceph_cap_flush *prealloc_cf;
1210 };
1211
1212 struct ceph_aio_work {
1213         struct work_struct work;
1214         struct ceph_osd_request *req;
1215 };
1216
1217 static void ceph_aio_retry_work(struct work_struct *work);
1218
1219 static void ceph_aio_complete(struct inode *inode,
1220                               struct ceph_aio_request *aio_req)
1221 {
1222         struct ceph_client *cl = ceph_inode_to_client(inode);
1223         struct ceph_inode_info *ci = ceph_inode(inode);
1224         int ret;
1225
1226         if (!atomic_dec_and_test(&aio_req->pending_reqs))
1227                 return;
1228
1229         if (aio_req->iocb->ki_flags & IOCB_DIRECT)
1230                 inode_dio_end(inode);
1231
1232         ret = aio_req->error;
1233         if (!ret)
1234                 ret = aio_req->total_len;
1235
1236         doutc(cl, "%p %llx.%llx rc %d\n", inode, ceph_vinop(inode), ret);
1237
1238         if (ret >= 0 && aio_req->write) {
1239                 int dirty;
1240
1241                 loff_t endoff = aio_req->iocb->ki_pos + aio_req->total_len;
1242                 if (endoff > i_size_read(inode)) {
1243                         if (ceph_inode_set_size(inode, endoff))
1244                                 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY);
1245                 }
1246
1247                 spin_lock(&ci->i_ceph_lock);
1248                 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1249                                                &aio_req->prealloc_cf);
1250                 spin_unlock(&ci->i_ceph_lock);
1251                 if (dirty)
1252                         __mark_inode_dirty(inode, dirty);
1253
1254         }
1255
1256         ceph_put_cap_refs(ci, (aio_req->write ? CEPH_CAP_FILE_WR :
1257                                                 CEPH_CAP_FILE_RD));
1258
1259         aio_req->iocb->ki_complete(aio_req->iocb, ret);
1260
1261         ceph_free_cap_flush(aio_req->prealloc_cf);
1262         kfree(aio_req);
1263 }
1264
1265 static void ceph_aio_complete_req(struct ceph_osd_request *req)
1266 {
1267         int rc = req->r_result;
1268         struct inode *inode = req->r_inode;
1269         struct ceph_aio_request *aio_req = req->r_priv;
1270         struct ceph_osd_data *osd_data = osd_req_op_extent_osd_data(req, 0);
1271         struct ceph_osd_req_op *op = &req->r_ops[0];
1272         struct ceph_client_metric *metric = &ceph_sb_to_mdsc(inode->i_sb)->metric;
1273         unsigned int len = osd_data->bvec_pos.iter.bi_size;
1274         bool sparse = (op->op == CEPH_OSD_OP_SPARSE_READ);
1275         struct ceph_client *cl = ceph_inode_to_client(inode);
1276
1277         BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_BVECS);
1278         BUG_ON(!osd_data->num_bvecs);
1279
1280         doutc(cl, "req %p inode %p %llx.%llx, rc %d bytes %u\n", req,
1281               inode, ceph_vinop(inode), rc, len);
1282
1283         if (rc == -EOLDSNAPC) {
1284                 struct ceph_aio_work *aio_work;
1285                 BUG_ON(!aio_req->write);
1286
1287                 aio_work = kmalloc(sizeof(*aio_work), GFP_NOFS);
1288                 if (aio_work) {
1289                         INIT_WORK(&aio_work->work, ceph_aio_retry_work);
1290                         aio_work->req = req;
1291                         queue_work(ceph_inode_to_fs_client(inode)->inode_wq,
1292                                    &aio_work->work);
1293                         return;
1294                 }
1295                 rc = -ENOMEM;
1296         } else if (!aio_req->write) {
1297                 if (sparse && rc >= 0)
1298                         rc = ceph_sparse_ext_map_end(op);
1299                 if (rc == -ENOENT)
1300                         rc = 0;
1301                 if (rc >= 0 && len > rc) {
1302                         struct iov_iter i;
1303                         int zlen = len - rc;
1304
1305                         /*
1306                          * If read is satisfied by single OSD request,
1307                          * it can pass EOF. Otherwise read is within
1308                          * i_size.
1309                          */
1310                         if (aio_req->num_reqs == 1) {
1311                                 loff_t i_size = i_size_read(inode);
1312                                 loff_t endoff = aio_req->iocb->ki_pos + rc;
1313                                 if (endoff < i_size)
1314                                         zlen = min_t(size_t, zlen,
1315                                                      i_size - endoff);
1316                                 aio_req->total_len = rc + zlen;
1317                         }
1318
1319                         iov_iter_bvec(&i, ITER_DEST, osd_data->bvec_pos.bvecs,
1320                                       osd_data->num_bvecs, len);
1321                         iov_iter_advance(&i, rc);
1322                         iov_iter_zero(zlen, &i);
1323                 }
1324         }
1325
1326         /* r_start_latency == 0 means the request was not submitted */
1327         if (req->r_start_latency) {
1328                 if (aio_req->write)
1329                         ceph_update_write_metrics(metric, req->r_start_latency,
1330                                                   req->r_end_latency, len, rc);
1331                 else
1332                         ceph_update_read_metrics(metric, req->r_start_latency,
1333                                                  req->r_end_latency, len, rc);
1334         }
1335
1336         put_bvecs(osd_data->bvec_pos.bvecs, osd_data->num_bvecs,
1337                   aio_req->should_dirty);
1338         ceph_osdc_put_request(req);
1339
1340         if (rc < 0)
1341                 cmpxchg(&aio_req->error, 0, rc);
1342
1343         ceph_aio_complete(inode, aio_req);
1344         return;
1345 }
1346
1347 static void ceph_aio_retry_work(struct work_struct *work)
1348 {
1349         struct ceph_aio_work *aio_work =
1350                 container_of(work, struct ceph_aio_work, work);
1351         struct ceph_osd_request *orig_req = aio_work->req;
1352         struct ceph_aio_request *aio_req = orig_req->r_priv;
1353         struct inode *inode = orig_req->r_inode;
1354         struct ceph_inode_info *ci = ceph_inode(inode);
1355         struct ceph_snap_context *snapc;
1356         struct ceph_osd_request *req;
1357         int ret;
1358
1359         spin_lock(&ci->i_ceph_lock);
1360         if (__ceph_have_pending_cap_snap(ci)) {
1361                 struct ceph_cap_snap *capsnap =
1362                         list_last_entry(&ci->i_cap_snaps,
1363                                         struct ceph_cap_snap,
1364                                         ci_item);
1365                 snapc = ceph_get_snap_context(capsnap->context);
1366         } else {
1367                 BUG_ON(!ci->i_head_snapc);
1368                 snapc = ceph_get_snap_context(ci->i_head_snapc);
1369         }
1370         spin_unlock(&ci->i_ceph_lock);
1371
1372         req = ceph_osdc_alloc_request(orig_req->r_osdc, snapc, 1,
1373                         false, GFP_NOFS);
1374         if (!req) {
1375                 ret = -ENOMEM;
1376                 req = orig_req;
1377                 goto out;
1378         }
1379
1380         req->r_flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE;
1381         ceph_oloc_copy(&req->r_base_oloc, &orig_req->r_base_oloc);
1382         ceph_oid_copy(&req->r_base_oid, &orig_req->r_base_oid);
1383
1384         req->r_ops[0] = orig_req->r_ops[0];
1385
1386         req->r_mtime = aio_req->mtime;
1387         req->r_data_offset = req->r_ops[0].extent.offset;
1388
1389         ret = ceph_osdc_alloc_messages(req, GFP_NOFS);
1390         if (ret) {
1391                 ceph_osdc_put_request(req);
1392                 req = orig_req;
1393                 goto out;
1394         }
1395
1396         ceph_osdc_put_request(orig_req);
1397
1398         req->r_callback = ceph_aio_complete_req;
1399         req->r_inode = inode;
1400         req->r_priv = aio_req;
1401
1402         ceph_osdc_start_request(req->r_osdc, req);
1403 out:
1404         if (ret < 0) {
1405                 req->r_result = ret;
1406                 ceph_aio_complete_req(req);
1407         }
1408
1409         ceph_put_snap_context(snapc);
1410         kfree(aio_work);
1411 }
1412
1413 static ssize_t
1414 ceph_direct_read_write(struct kiocb *iocb, struct iov_iter *iter,
1415                        struct ceph_snap_context *snapc,
1416                        struct ceph_cap_flush **pcf)
1417 {
1418         struct file *file = iocb->ki_filp;
1419         struct inode *inode = file_inode(file);
1420         struct ceph_inode_info *ci = ceph_inode(inode);
1421         struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
1422         struct ceph_client *cl = fsc->client;
1423         struct ceph_client_metric *metric = &fsc->mdsc->metric;
1424         struct ceph_vino vino;
1425         struct ceph_osd_request *req;
1426         struct bio_vec *bvecs;
1427         struct ceph_aio_request *aio_req = NULL;
1428         int num_pages = 0;
1429         int flags;
1430         int ret = 0;
1431         struct timespec64 mtime = current_time(inode);
1432         size_t count = iov_iter_count(iter);
1433         loff_t pos = iocb->ki_pos;
1434         bool write = iov_iter_rw(iter) == WRITE;
1435         bool should_dirty = !write && user_backed_iter(iter);
1436         bool sparse = ceph_test_mount_opt(fsc, SPARSEREAD);
1437
1438         if (write && ceph_snap(file_inode(file)) != CEPH_NOSNAP)
1439                 return -EROFS;
1440
1441         doutc(cl, "sync_direct_%s on file %p %lld~%u snapc %p seq %lld\n",
1442               (write ? "write" : "read"), file, pos, (unsigned)count,
1443               snapc, snapc ? snapc->seq : 0);
1444
1445         if (write) {
1446                 int ret2;
1447
1448                 ceph_fscache_invalidate(inode, true);
1449
1450                 ret2 = invalidate_inode_pages2_range(inode->i_mapping,
1451                                         pos >> PAGE_SHIFT,
1452                                         (pos + count - 1) >> PAGE_SHIFT);
1453                 if (ret2 < 0)
1454                         doutc(cl, "invalidate_inode_pages2_range returned %d\n",
1455                               ret2);
1456
1457                 flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE;
1458         } else {
1459                 flags = CEPH_OSD_FLAG_READ;
1460         }
1461
1462         while (iov_iter_count(iter) > 0) {
1463                 u64 size = iov_iter_count(iter);
1464                 ssize_t len;
1465                 struct ceph_osd_req_op *op;
1466                 int readop = sparse ? CEPH_OSD_OP_SPARSE_READ : CEPH_OSD_OP_READ;
1467
1468                 if (write)
1469                         size = min_t(u64, size, fsc->mount_options->wsize);
1470                 else
1471                         size = min_t(u64, size, fsc->mount_options->rsize);
1472
1473                 vino = ceph_vino(inode);
1474                 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1475                                             vino, pos, &size, 0,
1476                                             1,
1477                                             write ? CEPH_OSD_OP_WRITE : readop,
1478                                             flags, snapc,
1479                                             ci->i_truncate_seq,
1480                                             ci->i_truncate_size,
1481                                             false);
1482                 if (IS_ERR(req)) {
1483                         ret = PTR_ERR(req);
1484                         break;
1485                 }
1486
1487                 len = iter_get_bvecs_alloc(iter, size, &bvecs, &num_pages);
1488                 if (len < 0) {
1489                         ceph_osdc_put_request(req);
1490                         ret = len;
1491                         break;
1492                 }
1493                 if (len != size)
1494                         osd_req_op_extent_update(req, 0, len);
1495
1496                 /*
1497                  * To simplify error handling, allow AIO when IO within i_size
1498                  * or IO can be satisfied by single OSD request.
1499                  */
1500                 if (pos == iocb->ki_pos && !is_sync_kiocb(iocb) &&
1501                     (len == count || pos + count <= i_size_read(inode))) {
1502                         aio_req = kzalloc(sizeof(*aio_req), GFP_KERNEL);
1503                         if (aio_req) {
1504                                 aio_req->iocb = iocb;
1505                                 aio_req->write = write;
1506                                 aio_req->should_dirty = should_dirty;
1507                                 INIT_LIST_HEAD(&aio_req->osd_reqs);
1508                                 if (write) {
1509                                         aio_req->mtime = mtime;
1510                                         swap(aio_req->prealloc_cf, *pcf);
1511                                 }
1512                         }
1513                         /* ignore error */
1514                 }
1515
1516                 if (write) {
1517                         /*
1518                          * throw out any page cache pages in this range. this
1519                          * may block.
1520                          */
1521                         truncate_inode_pages_range(inode->i_mapping, pos,
1522                                                    PAGE_ALIGN(pos + len) - 1);
1523
1524                         req->r_mtime = mtime;
1525                 }
1526
1527                 osd_req_op_extent_osd_data_bvecs(req, 0, bvecs, num_pages, len);
1528                 op = &req->r_ops[0];
1529                 if (sparse) {
1530                         ret = ceph_alloc_sparse_ext_map(op);
1531                         if (ret) {
1532                                 ceph_osdc_put_request(req);
1533                                 break;
1534                         }
1535                 }
1536
1537                 if (aio_req) {
1538                         aio_req->total_len += len;
1539                         aio_req->num_reqs++;
1540                         atomic_inc(&aio_req->pending_reqs);
1541
1542                         req->r_callback = ceph_aio_complete_req;
1543                         req->r_inode = inode;
1544                         req->r_priv = aio_req;
1545                         list_add_tail(&req->r_private_item, &aio_req->osd_reqs);
1546
1547                         pos += len;
1548                         continue;
1549                 }
1550
1551                 ceph_osdc_start_request(req->r_osdc, req);
1552                 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1553
1554                 if (write)
1555                         ceph_update_write_metrics(metric, req->r_start_latency,
1556                                                   req->r_end_latency, len, ret);
1557                 else
1558                         ceph_update_read_metrics(metric, req->r_start_latency,
1559                                                  req->r_end_latency, len, ret);
1560
1561                 size = i_size_read(inode);
1562                 if (!write) {
1563                         if (sparse && ret >= 0)
1564                                 ret = ceph_sparse_ext_map_end(op);
1565                         else if (ret == -ENOENT)
1566                                 ret = 0;
1567
1568                         if (ret >= 0 && ret < len && pos + ret < size) {
1569                                 struct iov_iter i;
1570                                 int zlen = min_t(size_t, len - ret,
1571                                                  size - pos - ret);
1572
1573                                 iov_iter_bvec(&i, ITER_DEST, bvecs, num_pages, len);
1574                                 iov_iter_advance(&i, ret);
1575                                 iov_iter_zero(zlen, &i);
1576                                 ret += zlen;
1577                         }
1578                         if (ret >= 0)
1579                                 len = ret;
1580                 }
1581
1582                 put_bvecs(bvecs, num_pages, should_dirty);
1583                 ceph_osdc_put_request(req);
1584                 if (ret < 0)
1585                         break;
1586
1587                 pos += len;
1588                 if (!write && pos >= size)
1589                         break;
1590
1591                 if (write && pos > size) {
1592                         if (ceph_inode_set_size(inode, pos))
1593                                 ceph_check_caps(ceph_inode(inode),
1594                                                 CHECK_CAPS_AUTHONLY);
1595                 }
1596         }
1597
1598         if (aio_req) {
1599                 LIST_HEAD(osd_reqs);
1600
1601                 if (aio_req->num_reqs == 0) {
1602                         kfree(aio_req);
1603                         return ret;
1604                 }
1605
1606                 ceph_get_cap_refs(ci, write ? CEPH_CAP_FILE_WR :
1607                                               CEPH_CAP_FILE_RD);
1608
1609                 list_splice(&aio_req->osd_reqs, &osd_reqs);
1610                 inode_dio_begin(inode);
1611                 while (!list_empty(&osd_reqs)) {
1612                         req = list_first_entry(&osd_reqs,
1613                                                struct ceph_osd_request,
1614                                                r_private_item);
1615                         list_del_init(&req->r_private_item);
1616                         if (ret >= 0)
1617                                 ceph_osdc_start_request(req->r_osdc, req);
1618                         if (ret < 0) {
1619                                 req->r_result = ret;
1620                                 ceph_aio_complete_req(req);
1621                         }
1622                 }
1623                 return -EIOCBQUEUED;
1624         }
1625
1626         if (ret != -EOLDSNAPC && pos > iocb->ki_pos) {
1627                 ret = pos - iocb->ki_pos;
1628                 iocb->ki_pos = pos;
1629         }
1630         return ret;
1631 }
1632
1633 /*
1634  * Synchronous write, straight from __user pointer or user pages.
1635  *
1636  * If write spans object boundary, just do multiple writes.  (For a
1637  * correct atomic write, we should e.g. take write locks on all
1638  * objects, rollback on failure, etc.)
1639  */
1640 static ssize_t
1641 ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos,
1642                 struct ceph_snap_context *snapc)
1643 {
1644         struct file *file = iocb->ki_filp;
1645         struct inode *inode = file_inode(file);
1646         struct ceph_inode_info *ci = ceph_inode(inode);
1647         struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
1648         struct ceph_client *cl = fsc->client;
1649         struct ceph_osd_client *osdc = &fsc->client->osdc;
1650         struct ceph_osd_request *req;
1651         struct page **pages;
1652         u64 len;
1653         int num_pages;
1654         int written = 0;
1655         int ret;
1656         bool check_caps = false;
1657         struct timespec64 mtime = current_time(inode);
1658         size_t count = iov_iter_count(from);
1659
1660         if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
1661                 return -EROFS;
1662
1663         doutc(cl, "on file %p %lld~%u snapc %p seq %lld\n", file, pos,
1664               (unsigned)count, snapc, snapc->seq);
1665
1666         ret = filemap_write_and_wait_range(inode->i_mapping,
1667                                            pos, pos + count - 1);
1668         if (ret < 0)
1669                 return ret;
1670
1671         ceph_fscache_invalidate(inode, false);
1672
1673         while ((len = iov_iter_count(from)) > 0) {
1674                 size_t left;
1675                 int n;
1676                 u64 write_pos = pos;
1677                 u64 write_len = len;
1678                 u64 objnum, objoff;
1679                 u32 xlen;
1680                 u64 assert_ver = 0;
1681                 bool rmw;
1682                 bool first, last;
1683                 struct iov_iter saved_iter = *from;
1684                 size_t off;
1685
1686                 ceph_fscrypt_adjust_off_and_len(inode, &write_pos, &write_len);
1687
1688                 /* clamp the length to the end of first object */
1689                 ceph_calc_file_object_mapping(&ci->i_layout, write_pos,
1690                                               write_len, &objnum, &objoff,
1691                                               &xlen);
1692                 write_len = xlen;
1693
1694                 /* adjust len downward if it goes beyond current object */
1695                 if (pos + len > write_pos + write_len)
1696                         len = write_pos + write_len - pos;
1697
1698                 /*
1699                  * If we had to adjust the length or position to align with a
1700                  * crypto block, then we must do a read/modify/write cycle. We
1701                  * use a version assertion to redrive the thing if something
1702                  * changes in between.
1703                  */
1704                 first = pos != write_pos;
1705                 last = (pos + len) != (write_pos + write_len);
1706                 rmw = first || last;
1707
1708                 doutc(cl, "ino %llx %lld~%llu adjusted %lld~%llu -- %srmw\n",
1709                       ci->i_vino.ino, pos, len, write_pos, write_len,
1710                       rmw ? "" : "no ");
1711
1712                 /*
1713                  * The data is emplaced into the page as it would be if it were
1714                  * in an array of pagecache pages.
1715                  */
1716                 num_pages = calc_pages_for(write_pos, write_len);
1717                 pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
1718                 if (IS_ERR(pages)) {
1719                         ret = PTR_ERR(pages);
1720                         break;
1721                 }
1722
1723                 /* Do we need to preload the pages? */
1724                 if (rmw) {
1725                         u64 first_pos = write_pos;
1726                         u64 last_pos = (write_pos + write_len) - CEPH_FSCRYPT_BLOCK_SIZE;
1727                         u64 read_len = CEPH_FSCRYPT_BLOCK_SIZE;
1728                         struct ceph_osd_req_op *op;
1729
1730                         /* We should only need to do this for encrypted inodes */
1731                         WARN_ON_ONCE(!IS_ENCRYPTED(inode));
1732
1733                         /* No need to do two reads if first and last blocks are same */
1734                         if (first && last_pos == first_pos)
1735                                 last = false;
1736
1737                         /*
1738                          * Allocate a read request for one or two extents,
1739                          * depending on how the request was aligned.
1740                          */
1741                         req = ceph_osdc_new_request(osdc, &ci->i_layout,
1742                                         ci->i_vino, first ? first_pos : last_pos,
1743                                         &read_len, 0, (first && last) ? 2 : 1,
1744                                         CEPH_OSD_OP_SPARSE_READ, CEPH_OSD_FLAG_READ,
1745                                         NULL, ci->i_truncate_seq,
1746                                         ci->i_truncate_size, false);
1747                         if (IS_ERR(req)) {
1748                                 ceph_release_page_vector(pages, num_pages);
1749                                 ret = PTR_ERR(req);
1750                                 break;
1751                         }
1752
1753                         /* Something is misaligned! */
1754                         if (read_len != CEPH_FSCRYPT_BLOCK_SIZE) {
1755                                 ceph_osdc_put_request(req);
1756                                 ceph_release_page_vector(pages, num_pages);
1757                                 ret = -EIO;
1758                                 break;
1759                         }
1760
1761                         /* Add extent for first block? */
1762                         op = &req->r_ops[0];
1763
1764                         if (first) {
1765                                 osd_req_op_extent_osd_data_pages(req, 0, pages,
1766                                                          CEPH_FSCRYPT_BLOCK_SIZE,
1767                                                          offset_in_page(first_pos),
1768                                                          false, false);
1769                                 /* We only expect a single extent here */
1770                                 ret = __ceph_alloc_sparse_ext_map(op, 1);
1771                                 if (ret) {
1772                                         ceph_osdc_put_request(req);
1773                                         ceph_release_page_vector(pages, num_pages);
1774                                         break;
1775                                 }
1776                         }
1777
1778                         /* Add extent for last block */
1779                         if (last) {
1780                                 /* Init the other extent if first extent has been used */
1781                                 if (first) {
1782                                         op = &req->r_ops[1];
1783                                         osd_req_op_extent_init(req, 1,
1784                                                         CEPH_OSD_OP_SPARSE_READ,
1785                                                         last_pos, CEPH_FSCRYPT_BLOCK_SIZE,
1786                                                         ci->i_truncate_size,
1787                                                         ci->i_truncate_seq);
1788                                 }
1789
1790                                 ret = __ceph_alloc_sparse_ext_map(op, 1);
1791                                 if (ret) {
1792                                         ceph_osdc_put_request(req);
1793                                         ceph_release_page_vector(pages, num_pages);
1794                                         break;
1795                                 }
1796
1797                                 osd_req_op_extent_osd_data_pages(req, first ? 1 : 0,
1798                                                         &pages[num_pages - 1],
1799                                                         CEPH_FSCRYPT_BLOCK_SIZE,
1800                                                         offset_in_page(last_pos),
1801                                                         false, false);
1802                         }
1803
1804                         ceph_osdc_start_request(osdc, req);
1805                         ret = ceph_osdc_wait_request(osdc, req);
1806
1807                         /* FIXME: length field is wrong if there are 2 extents */
1808                         ceph_update_read_metrics(&fsc->mdsc->metric,
1809                                                  req->r_start_latency,
1810                                                  req->r_end_latency,
1811                                                  read_len, ret);
1812
1813                         /* Ok if object is not already present */
1814                         if (ret == -ENOENT) {
1815                                 /*
1816                                  * If there is no object, then we can't assert
1817                                  * on its version. Set it to 0, and we'll use an
1818                                  * exclusive create instead.
1819                                  */
1820                                 ceph_osdc_put_request(req);
1821                                 ret = 0;
1822
1823                                 /*
1824                                  * zero out the soon-to-be uncopied parts of the
1825                                  * first and last pages.
1826                                  */
1827                                 if (first)
1828                                         zero_user_segment(pages[0], 0,
1829                                                           offset_in_page(first_pos));
1830                                 if (last)
1831                                         zero_user_segment(pages[num_pages - 1],
1832                                                           offset_in_page(last_pos),
1833                                                           PAGE_SIZE);
1834                         } else {
1835                                 if (ret < 0) {
1836                                         ceph_osdc_put_request(req);
1837                                         ceph_release_page_vector(pages, num_pages);
1838                                         break;
1839                                 }
1840
1841                                 op = &req->r_ops[0];
1842                                 if (op->extent.sparse_ext_cnt == 0) {
1843                                         if (first)
1844                                                 zero_user_segment(pages[0], 0,
1845                                                                   offset_in_page(first_pos));
1846                                         else
1847                                                 zero_user_segment(pages[num_pages - 1],
1848                                                                   offset_in_page(last_pos),
1849                                                                   PAGE_SIZE);
1850                                 } else if (op->extent.sparse_ext_cnt != 1 ||
1851                                            ceph_sparse_ext_map_end(op) !=
1852                                                 CEPH_FSCRYPT_BLOCK_SIZE) {
1853                                         ret = -EIO;
1854                                         ceph_osdc_put_request(req);
1855                                         ceph_release_page_vector(pages, num_pages);
1856                                         break;
1857                                 }
1858
1859                                 if (first && last) {
1860                                         op = &req->r_ops[1];
1861                                         if (op->extent.sparse_ext_cnt == 0) {
1862                                                 zero_user_segment(pages[num_pages - 1],
1863                                                                   offset_in_page(last_pos),
1864                                                                   PAGE_SIZE);
1865                                         } else if (op->extent.sparse_ext_cnt != 1 ||
1866                                                    ceph_sparse_ext_map_end(op) !=
1867                                                         CEPH_FSCRYPT_BLOCK_SIZE) {
1868                                                 ret = -EIO;
1869                                                 ceph_osdc_put_request(req);
1870                                                 ceph_release_page_vector(pages, num_pages);
1871                                                 break;
1872                                         }
1873                                 }
1874
1875                                 /* Grab assert version. It must be non-zero. */
1876                                 assert_ver = req->r_version;
1877                                 WARN_ON_ONCE(ret > 0 && assert_ver == 0);
1878
1879                                 ceph_osdc_put_request(req);
1880                                 if (first) {
1881                                         ret = ceph_fscrypt_decrypt_block_inplace(inode,
1882                                                         pages[0], CEPH_FSCRYPT_BLOCK_SIZE,
1883                                                         offset_in_page(first_pos),
1884                                                         first_pos >> CEPH_FSCRYPT_BLOCK_SHIFT);
1885                                         if (ret < 0) {
1886                                                 ceph_release_page_vector(pages, num_pages);
1887                                                 break;
1888                                         }
1889                                 }
1890                                 if (last) {
1891                                         ret = ceph_fscrypt_decrypt_block_inplace(inode,
1892                                                         pages[num_pages - 1],
1893                                                         CEPH_FSCRYPT_BLOCK_SIZE,
1894                                                         offset_in_page(last_pos),
1895                                                         last_pos >> CEPH_FSCRYPT_BLOCK_SHIFT);
1896                                         if (ret < 0) {
1897                                                 ceph_release_page_vector(pages, num_pages);
1898                                                 break;
1899                                         }
1900                                 }
1901                         }
1902                 }
1903
1904                 left = len;
1905                 off = offset_in_page(pos);
1906                 for (n = 0; n < num_pages; n++) {
1907                         size_t plen = min_t(size_t, left, PAGE_SIZE - off);
1908
1909                         /* copy the data */
1910                         ret = copy_page_from_iter(pages[n], off, plen, from);
1911                         if (ret != plen) {
1912                                 ret = -EFAULT;
1913                                 break;
1914                         }
1915                         off = 0;
1916                         left -= ret;
1917                 }
1918                 if (ret < 0) {
1919                         doutc(cl, "write failed with %d\n", ret);
1920                         ceph_release_page_vector(pages, num_pages);
1921                         break;
1922                 }
1923
1924                 if (IS_ENCRYPTED(inode)) {
1925                         ret = ceph_fscrypt_encrypt_pages(inode, pages,
1926                                                          write_pos, write_len,
1927                                                          GFP_KERNEL);
1928                         if (ret < 0) {
1929                                 doutc(cl, "encryption failed with %d\n", ret);
1930                                 ceph_release_page_vector(pages, num_pages);
1931                                 break;
1932                         }
1933                 }
1934
1935                 req = ceph_osdc_new_request(osdc, &ci->i_layout,
1936                                             ci->i_vino, write_pos, &write_len,
1937                                             rmw ? 1 : 0, rmw ? 2 : 1,
1938                                             CEPH_OSD_OP_WRITE,
1939                                             CEPH_OSD_FLAG_WRITE,
1940                                             snapc, ci->i_truncate_seq,
1941                                             ci->i_truncate_size, false);
1942                 if (IS_ERR(req)) {
1943                         ret = PTR_ERR(req);
1944                         ceph_release_page_vector(pages, num_pages);
1945                         break;
1946                 }
1947
1948                 doutc(cl, "write op %lld~%llu\n", write_pos, write_len);
1949                 osd_req_op_extent_osd_data_pages(req, rmw ? 1 : 0, pages, write_len,
1950                                                  offset_in_page(write_pos), false,
1951                                                  true);
1952                 req->r_inode = inode;
1953                 req->r_mtime = mtime;
1954
1955                 /* Set up the assertion */
1956                 if (rmw) {
1957                         /*
1958                          * Set up the assertion. If we don't have a version
1959                          * number, then the object doesn't exist yet. Use an
1960                          * exclusive create instead of a version assertion in
1961                          * that case.
1962                          */
1963                         if (assert_ver) {
1964                                 osd_req_op_init(req, 0, CEPH_OSD_OP_ASSERT_VER, 0);
1965                                 req->r_ops[0].assert_ver.ver = assert_ver;
1966                         } else {
1967                                 osd_req_op_init(req, 0, CEPH_OSD_OP_CREATE,
1968                                                 CEPH_OSD_OP_FLAG_EXCL);
1969                         }
1970                 }
1971
1972                 ceph_osdc_start_request(osdc, req);
1973                 ret = ceph_osdc_wait_request(osdc, req);
1974
1975                 ceph_update_write_metrics(&fsc->mdsc->metric, req->r_start_latency,
1976                                           req->r_end_latency, len, ret);
1977                 ceph_osdc_put_request(req);
1978                 if (ret != 0) {
1979                         doutc(cl, "osd write returned %d\n", ret);
1980                         /* Version changed! Must re-do the rmw cycle */
1981                         if ((assert_ver && (ret == -ERANGE || ret == -EOVERFLOW)) ||
1982                             (!assert_ver && ret == -EEXIST)) {
1983                                 /* We should only ever see this on a rmw */
1984                                 WARN_ON_ONCE(!rmw);
1985
1986                                 /* The version should never go backward */
1987                                 WARN_ON_ONCE(ret == -EOVERFLOW);
1988
1989                                 *from = saved_iter;
1990
1991                                 /* FIXME: limit number of times we loop? */
1992                                 continue;
1993                         }
1994                         ceph_set_error_write(ci);
1995                         break;
1996                 }
1997
1998                 ceph_clear_error_write(ci);
1999
2000                 /*
2001                  * We successfully wrote to a range of the file. Declare
2002                  * that region of the pagecache invalid.
2003                  */
2004                 ret = invalidate_inode_pages2_range(
2005                                 inode->i_mapping,
2006                                 pos >> PAGE_SHIFT,
2007                                 (pos + len - 1) >> PAGE_SHIFT);
2008                 if (ret < 0) {
2009                         doutc(cl, "invalidate_inode_pages2_range returned %d\n",
2010                               ret);
2011                         ret = 0;
2012                 }
2013                 pos += len;
2014                 written += len;
2015                 doutc(cl, "written %d\n", written);
2016                 if (pos > i_size_read(inode)) {
2017                         check_caps = ceph_inode_set_size(inode, pos);
2018                         if (check_caps)
2019                                 ceph_check_caps(ceph_inode(inode),
2020                                                 CHECK_CAPS_AUTHONLY);
2021                 }
2022
2023         }
2024
2025         if (ret != -EOLDSNAPC && written > 0) {
2026                 ret = written;
2027                 iocb->ki_pos = pos;
2028         }
2029         doutc(cl, "returning %d\n", ret);
2030         return ret;
2031 }
2032
2033 /*
2034  * Wrap generic_file_aio_read with checks for cap bits on the inode.
2035  * Atomically grab references, so that those bits are not released
2036  * back to the MDS mid-read.
2037  *
2038  * Hmm, the sync read case isn't actually async... should it be?
2039  */
2040 static ssize_t ceph_read_iter(struct kiocb *iocb, struct iov_iter *to)
2041 {
2042         struct file *filp = iocb->ki_filp;
2043         struct ceph_file_info *fi = filp->private_data;
2044         size_t len = iov_iter_count(to);
2045         struct inode *inode = file_inode(filp);
2046         struct ceph_inode_info *ci = ceph_inode(inode);
2047         bool direct_lock = iocb->ki_flags & IOCB_DIRECT;
2048         struct ceph_client *cl = ceph_inode_to_client(inode);
2049         ssize_t ret;
2050         int want = 0, got = 0;
2051         int retry_op = 0, read = 0;
2052
2053 again:
2054         doutc(cl, "%llu~%u trying to get caps on %p %llx.%llx\n",
2055               iocb->ki_pos, (unsigned)len, inode, ceph_vinop(inode));
2056
2057         if (ceph_inode_is_shutdown(inode))
2058                 return -ESTALE;
2059
2060         if (direct_lock)
2061                 ceph_start_io_direct(inode);
2062         else
2063                 ceph_start_io_read(inode);
2064
2065         if (!(fi->flags & CEPH_F_SYNC) && !direct_lock)
2066                 want |= CEPH_CAP_FILE_CACHE;
2067         if (fi->fmode & CEPH_FILE_MODE_LAZY)
2068                 want |= CEPH_CAP_FILE_LAZYIO;
2069
2070         ret = ceph_get_caps(filp, CEPH_CAP_FILE_RD, want, -1, &got);
2071         if (ret < 0) {
2072                 if (direct_lock)
2073                         ceph_end_io_direct(inode);
2074                 else
2075                         ceph_end_io_read(inode);
2076                 return ret;
2077         }
2078
2079         if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 ||
2080             (iocb->ki_flags & IOCB_DIRECT) ||
2081             (fi->flags & CEPH_F_SYNC)) {
2082
2083                 doutc(cl, "sync %p %llx.%llx %llu~%u got cap refs on %s\n",
2084                       inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
2085                       ceph_cap_string(got));
2086
2087                 if (!ceph_has_inline_data(ci)) {
2088                         if (!retry_op &&
2089                             (iocb->ki_flags & IOCB_DIRECT) &&
2090                             !IS_ENCRYPTED(inode)) {
2091                                 ret = ceph_direct_read_write(iocb, to,
2092                                                              NULL, NULL);
2093                                 if (ret >= 0 && ret < len)
2094                                         retry_op = CHECK_EOF;
2095                         } else {
2096                                 ret = ceph_sync_read(iocb, to, &retry_op);
2097                         }
2098                 } else {
2099                         retry_op = READ_INLINE;
2100                 }
2101         } else {
2102                 CEPH_DEFINE_RW_CONTEXT(rw_ctx, got);
2103                 doutc(cl, "async %p %llx.%llx %llu~%u got cap refs on %s\n",
2104                       inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
2105                       ceph_cap_string(got));
2106                 ceph_add_rw_context(fi, &rw_ctx);
2107                 ret = generic_file_read_iter(iocb, to);
2108                 ceph_del_rw_context(fi, &rw_ctx);
2109         }
2110
2111         doutc(cl, "%p %llx.%llx dropping cap refs on %s = %d\n",
2112               inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret);
2113         ceph_put_cap_refs(ci, got);
2114
2115         if (direct_lock)
2116                 ceph_end_io_direct(inode);
2117         else
2118                 ceph_end_io_read(inode);
2119
2120         if (retry_op > HAVE_RETRIED && ret >= 0) {
2121                 int statret;
2122                 struct page *page = NULL;
2123                 loff_t i_size;
2124                 if (retry_op == READ_INLINE) {
2125                         page = __page_cache_alloc(GFP_KERNEL);
2126                         if (!page)
2127                                 return -ENOMEM;
2128                 }
2129
2130                 statret = __ceph_do_getattr(inode, page,
2131                                             CEPH_STAT_CAP_INLINE_DATA, !!page);
2132                 if (statret < 0) {
2133                         if (page)
2134                                 __free_page(page);
2135                         if (statret == -ENODATA) {
2136                                 BUG_ON(retry_op != READ_INLINE);
2137                                 goto again;
2138                         }
2139                         return statret;
2140                 }
2141
2142                 i_size = i_size_read(inode);
2143                 if (retry_op == READ_INLINE) {
2144                         BUG_ON(ret > 0 || read > 0);
2145                         if (iocb->ki_pos < i_size &&
2146                             iocb->ki_pos < PAGE_SIZE) {
2147                                 loff_t end = min_t(loff_t, i_size,
2148                                                    iocb->ki_pos + len);
2149                                 end = min_t(loff_t, end, PAGE_SIZE);
2150                                 if (statret < end)
2151                                         zero_user_segment(page, statret, end);
2152                                 ret = copy_page_to_iter(page,
2153                                                 iocb->ki_pos & ~PAGE_MASK,
2154                                                 end - iocb->ki_pos, to);
2155                                 iocb->ki_pos += ret;
2156                                 read += ret;
2157                         }
2158                         if (iocb->ki_pos < i_size && read < len) {
2159                                 size_t zlen = min_t(size_t, len - read,
2160                                                     i_size - iocb->ki_pos);
2161                                 ret = iov_iter_zero(zlen, to);
2162                                 iocb->ki_pos += ret;
2163                                 read += ret;
2164                         }
2165                         __free_pages(page, 0);
2166                         return read;
2167                 }
2168
2169                 /* hit EOF or hole? */
2170                 if (retry_op == CHECK_EOF && iocb->ki_pos < i_size &&
2171                     ret < len) {
2172                         doutc(cl, "hit hole, ppos %lld < size %lld, reading more\n",
2173                               iocb->ki_pos, i_size);
2174
2175                         read += ret;
2176                         len -= ret;
2177                         retry_op = HAVE_RETRIED;
2178                         goto again;
2179                 }
2180         }
2181
2182         if (ret >= 0)
2183                 ret += read;
2184
2185         return ret;
2186 }
2187
2188 /*
2189  * Wrap filemap_splice_read with checks for cap bits on the inode.
2190  * Atomically grab references, so that those bits are not released
2191  * back to the MDS mid-read.
2192  */
2193 static ssize_t ceph_splice_read(struct file *in, loff_t *ppos,
2194                                 struct pipe_inode_info *pipe,
2195                                 size_t len, unsigned int flags)
2196 {
2197         struct ceph_file_info *fi = in->private_data;
2198         struct inode *inode = file_inode(in);
2199         struct ceph_inode_info *ci = ceph_inode(inode);
2200         ssize_t ret;
2201         int want = 0, got = 0;
2202         CEPH_DEFINE_RW_CONTEXT(rw_ctx, 0);
2203
2204         dout("splice_read %p %llx.%llx %llu~%zu trying to get caps on %p\n",
2205              inode, ceph_vinop(inode), *ppos, len, inode);
2206
2207         if (ceph_inode_is_shutdown(inode))
2208                 return -ESTALE;
2209
2210         if (ceph_has_inline_data(ci) ||
2211             (fi->flags & CEPH_F_SYNC))
2212                 return copy_splice_read(in, ppos, pipe, len, flags);
2213
2214         ceph_start_io_read(inode);
2215
2216         want = CEPH_CAP_FILE_CACHE;
2217         if (fi->fmode & CEPH_FILE_MODE_LAZY)
2218                 want |= CEPH_CAP_FILE_LAZYIO;
2219
2220         ret = ceph_get_caps(in, CEPH_CAP_FILE_RD, want, -1, &got);
2221         if (ret < 0)
2222                 goto out_end;
2223
2224         if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) == 0) {
2225                 dout("splice_read/sync %p %llx.%llx %llu~%zu got cap refs on %s\n",
2226                      inode, ceph_vinop(inode), *ppos, len,
2227                      ceph_cap_string(got));
2228
2229                 ceph_put_cap_refs(ci, got);
2230                 ceph_end_io_read(inode);
2231                 return copy_splice_read(in, ppos, pipe, len, flags);
2232         }
2233
2234         dout("splice_read %p %llx.%llx %llu~%zu got cap refs on %s\n",
2235              inode, ceph_vinop(inode), *ppos, len, ceph_cap_string(got));
2236
2237         rw_ctx.caps = got;
2238         ceph_add_rw_context(fi, &rw_ctx);
2239         ret = filemap_splice_read(in, ppos, pipe, len, flags);
2240         ceph_del_rw_context(fi, &rw_ctx);
2241
2242         dout("splice_read %p %llx.%llx dropping cap refs on %s = %zd\n",
2243              inode, ceph_vinop(inode), ceph_cap_string(got), ret);
2244
2245         ceph_put_cap_refs(ci, got);
2246 out_end:
2247         ceph_end_io_read(inode);
2248         return ret;
2249 }
2250
2251 /*
2252  * Take cap references to avoid releasing caps to MDS mid-write.
2253  *
2254  * If we are synchronous, and write with an old snap context, the OSD
2255  * may return EOLDSNAPC.  In that case, retry the write.. _after_
2256  * dropping our cap refs and allowing the pending snap to logically
2257  * complete _before_ this write occurs.
2258  *
2259  * If we are near ENOSPC, write synchronously.
2260  */
2261 static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from)
2262 {
2263         struct file *file = iocb->ki_filp;
2264         struct ceph_file_info *fi = file->private_data;
2265         struct inode *inode = file_inode(file);
2266         struct ceph_inode_info *ci = ceph_inode(inode);
2267         struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
2268         struct ceph_client *cl = fsc->client;
2269         struct ceph_osd_client *osdc = &fsc->client->osdc;
2270         struct ceph_cap_flush *prealloc_cf;
2271         ssize_t count, written = 0;
2272         int err, want = 0, got;
2273         bool direct_lock = false;
2274         u32 map_flags;
2275         u64 pool_flags;
2276         loff_t pos;
2277         loff_t limit = max(i_size_read(inode), fsc->max_file_size);
2278
2279         if (ceph_inode_is_shutdown(inode))
2280                 return -ESTALE;
2281
2282         if (ceph_snap(inode) != CEPH_NOSNAP)
2283                 return -EROFS;
2284
2285         prealloc_cf = ceph_alloc_cap_flush();
2286         if (!prealloc_cf)
2287                 return -ENOMEM;
2288
2289         if ((iocb->ki_flags & (IOCB_DIRECT | IOCB_APPEND)) == IOCB_DIRECT)
2290                 direct_lock = true;
2291
2292 retry_snap:
2293         if (direct_lock)
2294                 ceph_start_io_direct(inode);
2295         else
2296                 ceph_start_io_write(inode);
2297
2298         if (iocb->ki_flags & IOCB_APPEND) {
2299                 err = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
2300                 if (err < 0)
2301                         goto out;
2302         }
2303
2304         err = generic_write_checks(iocb, from);
2305         if (err <= 0)
2306                 goto out;
2307
2308         pos = iocb->ki_pos;
2309         if (unlikely(pos >= limit)) {
2310                 err = -EFBIG;
2311                 goto out;
2312         } else {
2313                 iov_iter_truncate(from, limit - pos);
2314         }
2315
2316         count = iov_iter_count(from);
2317         if (ceph_quota_is_max_bytes_exceeded(inode, pos + count)) {
2318                 err = -EDQUOT;
2319                 goto out;
2320         }
2321
2322         down_read(&osdc->lock);
2323         map_flags = osdc->osdmap->flags;
2324         pool_flags = ceph_pg_pool_flags(osdc->osdmap, ci->i_layout.pool_id);
2325         up_read(&osdc->lock);
2326         if ((map_flags & CEPH_OSDMAP_FULL) ||
2327             (pool_flags & CEPH_POOL_FLAG_FULL)) {
2328                 err = -ENOSPC;
2329                 goto out;
2330         }
2331
2332         err = file_remove_privs(file);
2333         if (err)
2334                 goto out;
2335
2336         doutc(cl, "%p %llx.%llx %llu~%zd getting caps. i_size %llu\n",
2337               inode, ceph_vinop(inode), pos, count,
2338               i_size_read(inode));
2339         if (!(fi->flags & CEPH_F_SYNC) && !direct_lock)
2340                 want |= CEPH_CAP_FILE_BUFFER;
2341         if (fi->fmode & CEPH_FILE_MODE_LAZY)
2342                 want |= CEPH_CAP_FILE_LAZYIO;
2343         got = 0;
2344         err = ceph_get_caps(file, CEPH_CAP_FILE_WR, want, pos + count, &got);
2345         if (err < 0)
2346                 goto out;
2347
2348         err = file_update_time(file);
2349         if (err)
2350                 goto out_caps;
2351
2352         inode_inc_iversion_raw(inode);
2353
2354         doutc(cl, "%p %llx.%llx %llu~%zd got cap refs on %s\n",
2355               inode, ceph_vinop(inode), pos, count, ceph_cap_string(got));
2356
2357         if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 ||
2358             (iocb->ki_flags & IOCB_DIRECT) || (fi->flags & CEPH_F_SYNC) ||
2359             (ci->i_ceph_flags & CEPH_I_ERROR_WRITE)) {
2360                 struct ceph_snap_context *snapc;
2361                 struct iov_iter data;
2362
2363                 spin_lock(&ci->i_ceph_lock);
2364                 if (__ceph_have_pending_cap_snap(ci)) {
2365                         struct ceph_cap_snap *capsnap =
2366                                         list_last_entry(&ci->i_cap_snaps,
2367                                                         struct ceph_cap_snap,
2368                                                         ci_item);
2369                         snapc = ceph_get_snap_context(capsnap->context);
2370                 } else {
2371                         BUG_ON(!ci->i_head_snapc);
2372                         snapc = ceph_get_snap_context(ci->i_head_snapc);
2373                 }
2374                 spin_unlock(&ci->i_ceph_lock);
2375
2376                 /* we might need to revert back to that point */
2377                 data = *from;
2378                 if ((iocb->ki_flags & IOCB_DIRECT) && !IS_ENCRYPTED(inode))
2379                         written = ceph_direct_read_write(iocb, &data, snapc,
2380                                                          &prealloc_cf);
2381                 else
2382                         written = ceph_sync_write(iocb, &data, pos, snapc);
2383                 if (direct_lock)
2384                         ceph_end_io_direct(inode);
2385                 else
2386                         ceph_end_io_write(inode);
2387                 if (written > 0)
2388                         iov_iter_advance(from, written);
2389                 ceph_put_snap_context(snapc);
2390         } else {
2391                 /*
2392                  * No need to acquire the i_truncate_mutex. Because
2393                  * the MDS revokes Fwb caps before sending truncate
2394                  * message to us. We can't get Fwb cap while there
2395                  * are pending vmtruncate. So write and vmtruncate
2396                  * can not run at the same time
2397                  */
2398                 written = generic_perform_write(iocb, from);
2399                 ceph_end_io_write(inode);
2400         }
2401
2402         if (written >= 0) {
2403                 int dirty;
2404
2405                 spin_lock(&ci->i_ceph_lock);
2406                 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
2407                                                &prealloc_cf);
2408                 spin_unlock(&ci->i_ceph_lock);
2409                 if (dirty)
2410                         __mark_inode_dirty(inode, dirty);
2411                 if (ceph_quota_is_max_bytes_approaching(inode, iocb->ki_pos))
2412                         ceph_check_caps(ci, CHECK_CAPS_FLUSH);
2413         }
2414
2415         doutc(cl, "%p %llx.%llx %llu~%u  dropping cap refs on %s\n",
2416               inode, ceph_vinop(inode), pos, (unsigned)count,
2417               ceph_cap_string(got));
2418         ceph_put_cap_refs(ci, got);
2419
2420         if (written == -EOLDSNAPC) {
2421                 doutc(cl, "%p %llx.%llx %llu~%u" "got EOLDSNAPC, retrying\n",
2422                       inode, ceph_vinop(inode), pos, (unsigned)count);
2423                 goto retry_snap;
2424         }
2425
2426         if (written >= 0) {
2427                 if ((map_flags & CEPH_OSDMAP_NEARFULL) ||
2428                     (pool_flags & CEPH_POOL_FLAG_NEARFULL))
2429                         iocb->ki_flags |= IOCB_DSYNC;
2430                 written = generic_write_sync(iocb, written);
2431         }
2432
2433         goto out_unlocked;
2434 out_caps:
2435         ceph_put_cap_refs(ci, got);
2436 out:
2437         if (direct_lock)
2438                 ceph_end_io_direct(inode);
2439         else
2440                 ceph_end_io_write(inode);
2441 out_unlocked:
2442         ceph_free_cap_flush(prealloc_cf);
2443         return written ? written : err;
2444 }
2445
2446 /*
2447  * llseek.  be sure to verify file size on SEEK_END.
2448  */
2449 static loff_t ceph_llseek(struct file *file, loff_t offset, int whence)
2450 {
2451         if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) {
2452                 struct inode *inode = file_inode(file);
2453                 int ret;
2454
2455                 ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
2456                 if (ret < 0)
2457                         return ret;
2458         }
2459         return generic_file_llseek(file, offset, whence);
2460 }
2461
2462 static inline void ceph_zero_partial_page(
2463         struct inode *inode, loff_t offset, unsigned size)
2464 {
2465         struct page *page;
2466         pgoff_t index = offset >> PAGE_SHIFT;
2467
2468         page = find_lock_page(inode->i_mapping, index);
2469         if (page) {
2470                 wait_on_page_writeback(page);
2471                 zero_user(page, offset & (PAGE_SIZE - 1), size);
2472                 unlock_page(page);
2473                 put_page(page);
2474         }
2475 }
2476
2477 static void ceph_zero_pagecache_range(struct inode *inode, loff_t offset,
2478                                       loff_t length)
2479 {
2480         loff_t nearly = round_up(offset, PAGE_SIZE);
2481         if (offset < nearly) {
2482                 loff_t size = nearly - offset;
2483                 if (length < size)
2484                         size = length;
2485                 ceph_zero_partial_page(inode, offset, size);
2486                 offset += size;
2487                 length -= size;
2488         }
2489         if (length >= PAGE_SIZE) {
2490                 loff_t size = round_down(length, PAGE_SIZE);
2491                 truncate_pagecache_range(inode, offset, offset + size - 1);
2492                 offset += size;
2493                 length -= size;
2494         }
2495         if (length)
2496                 ceph_zero_partial_page(inode, offset, length);
2497 }
2498
2499 static int ceph_zero_partial_object(struct inode *inode,
2500                                     loff_t offset, loff_t *length)
2501 {
2502         struct ceph_inode_info *ci = ceph_inode(inode);
2503         struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
2504         struct ceph_osd_request *req;
2505         int ret = 0;
2506         loff_t zero = 0;
2507         int op;
2508
2509         if (ceph_inode_is_shutdown(inode))
2510                 return -EIO;
2511
2512         if (!length) {
2513                 op = offset ? CEPH_OSD_OP_DELETE : CEPH_OSD_OP_TRUNCATE;
2514                 length = &zero;
2515         } else {
2516                 op = CEPH_OSD_OP_ZERO;
2517         }
2518
2519         req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
2520                                         ceph_vino(inode),
2521                                         offset, length,
2522                                         0, 1, op,
2523                                         CEPH_OSD_FLAG_WRITE,
2524                                         NULL, 0, 0, false);
2525         if (IS_ERR(req)) {
2526                 ret = PTR_ERR(req);
2527                 goto out;
2528         }
2529
2530         req->r_mtime = inode_get_mtime(inode);
2531         ceph_osdc_start_request(&fsc->client->osdc, req);
2532         ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
2533         if (ret == -ENOENT)
2534                 ret = 0;
2535         ceph_osdc_put_request(req);
2536
2537 out:
2538         return ret;
2539 }
2540
2541 static int ceph_zero_objects(struct inode *inode, loff_t offset, loff_t length)
2542 {
2543         int ret = 0;
2544         struct ceph_inode_info *ci = ceph_inode(inode);
2545         s32 stripe_unit = ci->i_layout.stripe_unit;
2546         s32 stripe_count = ci->i_layout.stripe_count;
2547         s32 object_size = ci->i_layout.object_size;
2548         u64 object_set_size = object_size * stripe_count;
2549         u64 nearly, t;
2550
2551         /* round offset up to next period boundary */
2552         nearly = offset + object_set_size - 1;
2553         t = nearly;
2554         nearly -= do_div(t, object_set_size);
2555
2556         while (length && offset < nearly) {
2557                 loff_t size = length;
2558                 ret = ceph_zero_partial_object(inode, offset, &size);
2559                 if (ret < 0)
2560                         return ret;
2561                 offset += size;
2562                 length -= size;
2563         }
2564         while (length >= object_set_size) {
2565                 int i;
2566                 loff_t pos = offset;
2567                 for (i = 0; i < stripe_count; ++i) {
2568                         ret = ceph_zero_partial_object(inode, pos, NULL);
2569                         if (ret < 0)
2570                                 return ret;
2571                         pos += stripe_unit;
2572                 }
2573                 offset += object_set_size;
2574                 length -= object_set_size;
2575         }
2576         while (length) {
2577                 loff_t size = length;
2578                 ret = ceph_zero_partial_object(inode, offset, &size);
2579                 if (ret < 0)
2580                         return ret;
2581                 offset += size;
2582                 length -= size;
2583         }
2584         return ret;
2585 }
2586
2587 static long ceph_fallocate(struct file *file, int mode,
2588                                 loff_t offset, loff_t length)
2589 {
2590         struct ceph_file_info *fi = file->private_data;
2591         struct inode *inode = file_inode(file);
2592         struct ceph_inode_info *ci = ceph_inode(inode);
2593         struct ceph_cap_flush *prealloc_cf;
2594         struct ceph_client *cl = ceph_inode_to_client(inode);
2595         int want, got = 0;
2596         int dirty;
2597         int ret = 0;
2598         loff_t endoff = 0;
2599         loff_t size;
2600
2601         doutc(cl, "%p %llx.%llx mode %x, offset %llu length %llu\n",
2602               inode, ceph_vinop(inode), mode, offset, length);
2603
2604         if (mode != (FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
2605                 return -EOPNOTSUPP;
2606
2607         if (!S_ISREG(inode->i_mode))
2608                 return -EOPNOTSUPP;
2609
2610         if (IS_ENCRYPTED(inode))
2611                 return -EOPNOTSUPP;
2612
2613         prealloc_cf = ceph_alloc_cap_flush();
2614         if (!prealloc_cf)
2615                 return -ENOMEM;
2616
2617         inode_lock(inode);
2618
2619         if (ceph_snap(inode) != CEPH_NOSNAP) {
2620                 ret = -EROFS;
2621                 goto unlock;
2622         }
2623
2624         size = i_size_read(inode);
2625
2626         /* Are we punching a hole beyond EOF? */
2627         if (offset >= size)
2628                 goto unlock;
2629         if ((offset + length) > size)
2630                 length = size - offset;
2631
2632         if (fi->fmode & CEPH_FILE_MODE_LAZY)
2633                 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
2634         else
2635                 want = CEPH_CAP_FILE_BUFFER;
2636
2637         ret = ceph_get_caps(file, CEPH_CAP_FILE_WR, want, endoff, &got);
2638         if (ret < 0)
2639                 goto unlock;
2640
2641         ret = file_modified(file);
2642         if (ret)
2643                 goto put_caps;
2644
2645         filemap_invalidate_lock(inode->i_mapping);
2646         ceph_fscache_invalidate(inode, false);
2647         ceph_zero_pagecache_range(inode, offset, length);
2648         ret = ceph_zero_objects(inode, offset, length);
2649
2650         if (!ret) {
2651                 spin_lock(&ci->i_ceph_lock);
2652                 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
2653                                                &prealloc_cf);
2654                 spin_unlock(&ci->i_ceph_lock);
2655                 if (dirty)
2656                         __mark_inode_dirty(inode, dirty);
2657         }
2658         filemap_invalidate_unlock(inode->i_mapping);
2659
2660 put_caps:
2661         ceph_put_cap_refs(ci, got);
2662 unlock:
2663         inode_unlock(inode);
2664         ceph_free_cap_flush(prealloc_cf);
2665         return ret;
2666 }
2667
2668 /*
2669  * This function tries to get FILE_WR capabilities for dst_ci and FILE_RD for
2670  * src_ci.  Two attempts are made to obtain both caps, and an error is return if
2671  * this fails; zero is returned on success.
2672  */
2673 static int get_rd_wr_caps(struct file *src_filp, int *src_got,
2674                           struct file *dst_filp,
2675                           loff_t dst_endoff, int *dst_got)
2676 {
2677         int ret = 0;
2678         bool retrying = false;
2679
2680 retry_caps:
2681         ret = ceph_get_caps(dst_filp, CEPH_CAP_FILE_WR, CEPH_CAP_FILE_BUFFER,
2682                             dst_endoff, dst_got);
2683         if (ret < 0)
2684                 return ret;
2685
2686         /*
2687          * Since we're already holding the FILE_WR capability for the dst file,
2688          * we would risk a deadlock by using ceph_get_caps.  Thus, we'll do some
2689          * retry dance instead to try to get both capabilities.
2690          */
2691         ret = ceph_try_get_caps(file_inode(src_filp),
2692                                 CEPH_CAP_FILE_RD, CEPH_CAP_FILE_SHARED,
2693                                 false, src_got);
2694         if (ret <= 0) {
2695                 /* Start by dropping dst_ci caps and getting src_ci caps */
2696                 ceph_put_cap_refs(ceph_inode(file_inode(dst_filp)), *dst_got);
2697                 if (retrying) {
2698                         if (!ret)
2699                                 /* ceph_try_get_caps masks EAGAIN */
2700                                 ret = -EAGAIN;
2701                         return ret;
2702                 }
2703                 ret = ceph_get_caps(src_filp, CEPH_CAP_FILE_RD,
2704                                     CEPH_CAP_FILE_SHARED, -1, src_got);
2705                 if (ret < 0)
2706                         return ret;
2707                 /*... drop src_ci caps too, and retry */
2708                 ceph_put_cap_refs(ceph_inode(file_inode(src_filp)), *src_got);
2709                 retrying = true;
2710                 goto retry_caps;
2711         }
2712         return ret;
2713 }
2714
2715 static void put_rd_wr_caps(struct ceph_inode_info *src_ci, int src_got,
2716                            struct ceph_inode_info *dst_ci, int dst_got)
2717 {
2718         ceph_put_cap_refs(src_ci, src_got);
2719         ceph_put_cap_refs(dst_ci, dst_got);
2720 }
2721
2722 /*
2723  * This function does several size-related checks, returning an error if:
2724  *  - source file is smaller than off+len
2725  *  - destination file size is not OK (inode_newsize_ok())
2726  *  - max bytes quotas is exceeded
2727  */
2728 static int is_file_size_ok(struct inode *src_inode, struct inode *dst_inode,
2729                            loff_t src_off, loff_t dst_off, size_t len)
2730 {
2731         struct ceph_client *cl = ceph_inode_to_client(src_inode);
2732         loff_t size, endoff;
2733
2734         size = i_size_read(src_inode);
2735         /*
2736          * Don't copy beyond source file EOF.  Instead of simply setting length
2737          * to (size - src_off), just drop to VFS default implementation, as the
2738          * local i_size may be stale due to other clients writing to the source
2739          * inode.
2740          */
2741         if (src_off + len > size) {
2742                 doutc(cl, "Copy beyond EOF (%llu + %zu > %llu)\n", src_off,
2743                       len, size);
2744                 return -EOPNOTSUPP;
2745         }
2746         size = i_size_read(dst_inode);
2747
2748         endoff = dst_off + len;
2749         if (inode_newsize_ok(dst_inode, endoff))
2750                 return -EOPNOTSUPP;
2751
2752         if (ceph_quota_is_max_bytes_exceeded(dst_inode, endoff))
2753                 return -EDQUOT;
2754
2755         return 0;
2756 }
2757
2758 static struct ceph_osd_request *
2759 ceph_alloc_copyfrom_request(struct ceph_osd_client *osdc,
2760                             u64 src_snapid,
2761                             struct ceph_object_id *src_oid,
2762                             struct ceph_object_locator *src_oloc,
2763                             struct ceph_object_id *dst_oid,
2764                             struct ceph_object_locator *dst_oloc,
2765                             u32 truncate_seq, u64 truncate_size)
2766 {
2767         struct ceph_osd_request *req;
2768         int ret;
2769         u32 src_fadvise_flags =
2770                 CEPH_OSD_OP_FLAG_FADVISE_SEQUENTIAL |
2771                 CEPH_OSD_OP_FLAG_FADVISE_NOCACHE;
2772         u32 dst_fadvise_flags =
2773                 CEPH_OSD_OP_FLAG_FADVISE_SEQUENTIAL |
2774                 CEPH_OSD_OP_FLAG_FADVISE_DONTNEED;
2775
2776         req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_KERNEL);
2777         if (!req)
2778                 return ERR_PTR(-ENOMEM);
2779
2780         req->r_flags = CEPH_OSD_FLAG_WRITE;
2781
2782         ceph_oloc_copy(&req->r_t.base_oloc, dst_oloc);
2783         ceph_oid_copy(&req->r_t.base_oid, dst_oid);
2784
2785         ret = osd_req_op_copy_from_init(req, src_snapid, 0,
2786                                         src_oid, src_oloc,
2787                                         src_fadvise_flags,
2788                                         dst_fadvise_flags,
2789                                         truncate_seq,
2790                                         truncate_size,
2791                                         CEPH_OSD_COPY_FROM_FLAG_TRUNCATE_SEQ);
2792         if (ret)
2793                 goto out;
2794
2795         ret = ceph_osdc_alloc_messages(req, GFP_KERNEL);
2796         if (ret)
2797                 goto out;
2798
2799         return req;
2800
2801 out:
2802         ceph_osdc_put_request(req);
2803         return ERR_PTR(ret);
2804 }
2805
2806 static ssize_t ceph_do_objects_copy(struct ceph_inode_info *src_ci, u64 *src_off,
2807                                     struct ceph_inode_info *dst_ci, u64 *dst_off,
2808                                     struct ceph_fs_client *fsc,
2809                                     size_t len, unsigned int flags)
2810 {
2811         struct ceph_object_locator src_oloc, dst_oloc;
2812         struct ceph_object_id src_oid, dst_oid;
2813         struct ceph_osd_client *osdc;
2814         struct ceph_osd_request *req;
2815         size_t bytes = 0;
2816         u64 src_objnum, src_objoff, dst_objnum, dst_objoff;
2817         u32 src_objlen, dst_objlen;
2818         u32 object_size = src_ci->i_layout.object_size;
2819         struct ceph_client *cl = fsc->client;
2820         int ret;
2821
2822         src_oloc.pool = src_ci->i_layout.pool_id;
2823         src_oloc.pool_ns = ceph_try_get_string(src_ci->i_layout.pool_ns);
2824         dst_oloc.pool = dst_ci->i_layout.pool_id;
2825         dst_oloc.pool_ns = ceph_try_get_string(dst_ci->i_layout.pool_ns);
2826         osdc = &fsc->client->osdc;
2827
2828         while (len >= object_size) {
2829                 ceph_calc_file_object_mapping(&src_ci->i_layout, *src_off,
2830                                               object_size, &src_objnum,
2831                                               &src_objoff, &src_objlen);
2832                 ceph_calc_file_object_mapping(&dst_ci->i_layout, *dst_off,
2833                                               object_size, &dst_objnum,
2834                                               &dst_objoff, &dst_objlen);
2835                 ceph_oid_init(&src_oid);
2836                 ceph_oid_printf(&src_oid, "%llx.%08llx",
2837                                 src_ci->i_vino.ino, src_objnum);
2838                 ceph_oid_init(&dst_oid);
2839                 ceph_oid_printf(&dst_oid, "%llx.%08llx",
2840                                 dst_ci->i_vino.ino, dst_objnum);
2841                 /* Do an object remote copy */
2842                 req = ceph_alloc_copyfrom_request(osdc, src_ci->i_vino.snap,
2843                                                   &src_oid, &src_oloc,
2844                                                   &dst_oid, &dst_oloc,
2845                                                   dst_ci->i_truncate_seq,
2846                                                   dst_ci->i_truncate_size);
2847                 if (IS_ERR(req))
2848                         ret = PTR_ERR(req);
2849                 else {
2850                         ceph_osdc_start_request(osdc, req);
2851                         ret = ceph_osdc_wait_request(osdc, req);
2852                         ceph_update_copyfrom_metrics(&fsc->mdsc->metric,
2853                                                      req->r_start_latency,
2854                                                      req->r_end_latency,
2855                                                      object_size, ret);
2856                         ceph_osdc_put_request(req);
2857                 }
2858                 if (ret) {
2859                         if (ret == -EOPNOTSUPP) {
2860                                 fsc->have_copy_from2 = false;
2861                                 pr_notice_client(cl,
2862                                         "OSDs don't support copy-from2; disabling copy offload\n");
2863                         }
2864                         doutc(cl, "returned %d\n", ret);
2865                         if (!bytes)
2866                                 bytes = ret;
2867                         goto out;
2868                 }
2869                 len -= object_size;
2870                 bytes += object_size;
2871                 *src_off += object_size;
2872                 *dst_off += object_size;
2873         }
2874
2875 out:
2876         ceph_oloc_destroy(&src_oloc);
2877         ceph_oloc_destroy(&dst_oloc);
2878         return bytes;
2879 }
2880
2881 static ssize_t __ceph_copy_file_range(struct file *src_file, loff_t src_off,
2882                                       struct file *dst_file, loff_t dst_off,
2883                                       size_t len, unsigned int flags)
2884 {
2885         struct inode *src_inode = file_inode(src_file);
2886         struct inode *dst_inode = file_inode(dst_file);
2887         struct ceph_inode_info *src_ci = ceph_inode(src_inode);
2888         struct ceph_inode_info *dst_ci = ceph_inode(dst_inode);
2889         struct ceph_cap_flush *prealloc_cf;
2890         struct ceph_fs_client *src_fsc = ceph_inode_to_fs_client(src_inode);
2891         struct ceph_client *cl = src_fsc->client;
2892         loff_t size;
2893         ssize_t ret = -EIO, bytes;
2894         u64 src_objnum, dst_objnum, src_objoff, dst_objoff;
2895         u32 src_objlen, dst_objlen;
2896         int src_got = 0, dst_got = 0, err, dirty;
2897
2898         if (src_inode->i_sb != dst_inode->i_sb) {
2899                 struct ceph_fs_client *dst_fsc = ceph_inode_to_fs_client(dst_inode);
2900
2901                 if (ceph_fsid_compare(&src_fsc->client->fsid,
2902                                       &dst_fsc->client->fsid)) {
2903                         dout("Copying files across clusters: src: %pU dst: %pU\n",
2904                              &src_fsc->client->fsid, &dst_fsc->client->fsid);
2905                         return -EXDEV;
2906                 }
2907         }
2908         if (ceph_snap(dst_inode) != CEPH_NOSNAP)
2909                 return -EROFS;
2910
2911         /*
2912          * Some of the checks below will return -EOPNOTSUPP, which will force a
2913          * fallback to the default VFS copy_file_range implementation.  This is
2914          * desirable in several cases (for ex, the 'len' is smaller than the
2915          * size of the objects, or in cases where that would be more
2916          * efficient).
2917          */
2918
2919         if (ceph_test_mount_opt(src_fsc, NOCOPYFROM))
2920                 return -EOPNOTSUPP;
2921
2922         if (!src_fsc->have_copy_from2)
2923                 return -EOPNOTSUPP;
2924
2925         /*
2926          * Striped file layouts require that we copy partial objects, but the
2927          * OSD copy-from operation only supports full-object copies.  Limit
2928          * this to non-striped file layouts for now.
2929          */
2930         if ((src_ci->i_layout.stripe_unit != dst_ci->i_layout.stripe_unit) ||
2931             (src_ci->i_layout.stripe_count != 1) ||
2932             (dst_ci->i_layout.stripe_count != 1) ||
2933             (src_ci->i_layout.object_size != dst_ci->i_layout.object_size)) {
2934                 doutc(cl, "Invalid src/dst files layout\n");
2935                 return -EOPNOTSUPP;
2936         }
2937
2938         /* Every encrypted inode gets its own key, so we can't offload them */
2939         if (IS_ENCRYPTED(src_inode) || IS_ENCRYPTED(dst_inode))
2940                 return -EOPNOTSUPP;
2941
2942         if (len < src_ci->i_layout.object_size)
2943                 return -EOPNOTSUPP; /* no remote copy will be done */
2944
2945         prealloc_cf = ceph_alloc_cap_flush();
2946         if (!prealloc_cf)
2947                 return -ENOMEM;
2948
2949         /* Start by sync'ing the source and destination files */
2950         ret = file_write_and_wait_range(src_file, src_off, (src_off + len));
2951         if (ret < 0) {
2952                 doutc(cl, "failed to write src file (%zd)\n", ret);
2953                 goto out;
2954         }
2955         ret = file_write_and_wait_range(dst_file, dst_off, (dst_off + len));
2956         if (ret < 0) {
2957                 doutc(cl, "failed to write dst file (%zd)\n", ret);
2958                 goto out;
2959         }
2960
2961         /*
2962          * We need FILE_WR caps for dst_ci and FILE_RD for src_ci as other
2963          * clients may have dirty data in their caches.  And OSDs know nothing
2964          * about caps, so they can't safely do the remote object copies.
2965          */
2966         err = get_rd_wr_caps(src_file, &src_got,
2967                              dst_file, (dst_off + len), &dst_got);
2968         if (err < 0) {
2969                 doutc(cl, "get_rd_wr_caps returned %d\n", err);
2970                 ret = -EOPNOTSUPP;
2971                 goto out;
2972         }
2973
2974         ret = is_file_size_ok(src_inode, dst_inode, src_off, dst_off, len);
2975         if (ret < 0)
2976                 goto out_caps;
2977
2978         /* Drop dst file cached pages */
2979         ceph_fscache_invalidate(dst_inode, false);
2980         ret = invalidate_inode_pages2_range(dst_inode->i_mapping,
2981                                             dst_off >> PAGE_SHIFT,
2982                                             (dst_off + len) >> PAGE_SHIFT);
2983         if (ret < 0) {
2984                 doutc(cl, "Failed to invalidate inode pages (%zd)\n",
2985                             ret);
2986                 ret = 0; /* XXX */
2987         }
2988         ceph_calc_file_object_mapping(&src_ci->i_layout, src_off,
2989                                       src_ci->i_layout.object_size,
2990                                       &src_objnum, &src_objoff, &src_objlen);
2991         ceph_calc_file_object_mapping(&dst_ci->i_layout, dst_off,
2992                                       dst_ci->i_layout.object_size,
2993                                       &dst_objnum, &dst_objoff, &dst_objlen);
2994         /* object-level offsets need to the same */
2995         if (src_objoff != dst_objoff) {
2996                 ret = -EOPNOTSUPP;
2997                 goto out_caps;
2998         }
2999
3000         /*
3001          * Do a manual copy if the object offset isn't object aligned.
3002          * 'src_objlen' contains the bytes left until the end of the object,
3003          * starting at the src_off
3004          */
3005         if (src_objoff) {
3006                 doutc(cl, "Initial partial copy of %u bytes\n", src_objlen);
3007
3008                 /*
3009                  * we need to temporarily drop all caps as we'll be calling
3010                  * {read,write}_iter, which will get caps again.
3011                  */
3012                 put_rd_wr_caps(src_ci, src_got, dst_ci, dst_got);
3013                 ret = do_splice_direct(src_file, &src_off, dst_file,
3014                                        &dst_off, src_objlen, flags);
3015                 /* Abort on short copies or on error */
3016                 if (ret < (long)src_objlen) {
3017                         doutc(cl, "Failed partial copy (%zd)\n", ret);
3018                         goto out;
3019                 }
3020                 len -= ret;
3021                 err = get_rd_wr_caps(src_file, &src_got,
3022                                      dst_file, (dst_off + len), &dst_got);
3023                 if (err < 0)
3024                         goto out;
3025                 err = is_file_size_ok(src_inode, dst_inode,
3026                                       src_off, dst_off, len);
3027                 if (err < 0)
3028                         goto out_caps;
3029         }
3030
3031         size = i_size_read(dst_inode);
3032         bytes = ceph_do_objects_copy(src_ci, &src_off, dst_ci, &dst_off,
3033                                      src_fsc, len, flags);
3034         if (bytes <= 0) {
3035                 if (!ret)
3036                         ret = bytes;
3037                 goto out_caps;
3038         }
3039         doutc(cl, "Copied %zu bytes out of %zu\n", bytes, len);
3040         len -= bytes;
3041         ret += bytes;
3042
3043         file_update_time(dst_file);
3044         inode_inc_iversion_raw(dst_inode);
3045
3046         if (dst_off > size) {
3047                 /* Let the MDS know about dst file size change */
3048                 if (ceph_inode_set_size(dst_inode, dst_off) ||
3049                     ceph_quota_is_max_bytes_approaching(dst_inode, dst_off))
3050                         ceph_check_caps(dst_ci, CHECK_CAPS_AUTHONLY | CHECK_CAPS_FLUSH);
3051         }
3052         /* Mark Fw dirty */
3053         spin_lock(&dst_ci->i_ceph_lock);
3054         dirty = __ceph_mark_dirty_caps(dst_ci, CEPH_CAP_FILE_WR, &prealloc_cf);
3055         spin_unlock(&dst_ci->i_ceph_lock);
3056         if (dirty)
3057                 __mark_inode_dirty(dst_inode, dirty);
3058
3059 out_caps:
3060         put_rd_wr_caps(src_ci, src_got, dst_ci, dst_got);
3061
3062         /*
3063          * Do the final manual copy if we still have some bytes left, unless
3064          * there were errors in remote object copies (len >= object_size).
3065          */
3066         if (len && (len < src_ci->i_layout.object_size)) {
3067                 doutc(cl, "Final partial copy of %zu bytes\n", len);
3068                 bytes = do_splice_direct(src_file, &src_off, dst_file,
3069                                          &dst_off, len, flags);
3070                 if (bytes > 0)
3071                         ret += bytes;
3072                 else
3073                         doutc(cl, "Failed partial copy (%zd)\n", bytes);
3074         }
3075
3076 out:
3077         ceph_free_cap_flush(prealloc_cf);
3078
3079         return ret;
3080 }
3081
3082 static ssize_t ceph_copy_file_range(struct file *src_file, loff_t src_off,
3083                                     struct file *dst_file, loff_t dst_off,
3084                                     size_t len, unsigned int flags)
3085 {
3086         ssize_t ret;
3087
3088         ret = __ceph_copy_file_range(src_file, src_off, dst_file, dst_off,
3089                                      len, flags);
3090
3091         if (ret == -EOPNOTSUPP || ret == -EXDEV)
3092                 ret = generic_copy_file_range(src_file, src_off, dst_file,
3093                                               dst_off, len, flags);
3094         return ret;
3095 }
3096
3097 const struct file_operations ceph_file_fops = {
3098         .open = ceph_open,
3099         .release = ceph_release,
3100         .llseek = ceph_llseek,
3101         .read_iter = ceph_read_iter,
3102         .write_iter = ceph_write_iter,
3103         .mmap = ceph_mmap,
3104         .fsync = ceph_fsync,
3105         .lock = ceph_lock,
3106         .setlease = simple_nosetlease,
3107         .flock = ceph_flock,
3108         .splice_read = ceph_splice_read,
3109         .splice_write = iter_file_splice_write,
3110         .unlocked_ioctl = ceph_ioctl,
3111         .compat_ioctl = compat_ptr_ioctl,
3112         .fallocate      = ceph_fallocate,
3113         .copy_file_range = ceph_copy_file_range,
3114 };