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 #include <linux/splice.h>
  16
  17 #include "super.h"
  18 #include "mds_client.h"
  19 #include "cache.h"
  20 #include "io.h"
  21 #include "metric.h"
  22
  23 static __le32 ceph_flags_sys2wire(struct ceph_mds_client *mdsc, u32 flags)
  24 {
  25         struct ceph_client *cl = mdsc->fsc->client;
  26         u32 wire_flags = 0;
  27
  28         switch (flags & O_ACCMODE) {
  29         case O_RDONLY:
  30                 wire_flags |= CEPH_O_RDONLY;
  31                 break;
  32         case O_WRONLY:
  33                 wire_flags |= CEPH_O_WRONLY;
  34                 break;
  35         case O_RDWR:
  36                 wire_flags |= CEPH_O_RDWR;
  37                 break;
  38         }
  39
  40         flags &= ~O_ACCMODE;
  41
  42 #define ceph_sys2wire(a) if (flags & a) { wire_flags |= CEPH_##a; flags &= ~a; }
  43
  44         ceph_sys2wire(O_CREAT);
  45         ceph_sys2wire(O_EXCL);
  46         ceph_sys2wire(O_TRUNC);
  47         ceph_sys2wire(O_DIRECTORY);
  48         ceph_sys2wire(O_NOFOLLOW);
  49
  50 #undef ceph_sys2wire
  51
  52         if (flags)
  53                 doutc(cl, "unused open flags: %x\n", flags);
  54
  55         return cpu_to_le32(wire_flags);
  56 }
  57
  58 /*
  59  * Ceph file operations
  60  *
  61  * Implement basic open/close functionality, and implement
  62  * read/write.
  63  *
  64  * We implement three modes of file I/O:
  65  *  - buffered uses the generic_file_aio_{read,write} helpers
  66  *
  67  *  - synchronous is used when there is multi-client read/write
  68  *    sharing, avoids the page cache, and synchronously waits for an
  69  *    ack from the OSD.
  70  *
  71  *  - direct io takes the variant of the sync path that references
  72  *    user pages directly.
  73  *
  74  * fsync() flushes and waits on dirty pages, but just queues metadata
  75  * for writeback: since the MDS can recover size and mtime there is no
  76  * need to wait for MDS acknowledgement.
  77  */
  78
  79 /*
  80  * How many pages to get in one call to iov_iter_get_pages().  This
  81  * determines the size of the on-stack array used as a buffer.
  82  */
  83 #define ITER_GET_BVECS_PAGES    64
  84
  85 static ssize_t __iter_get_bvecs(struct iov_iter *iter, size_t maxsize,
  86                                 struct bio_vec *bvecs)
  87 {
  88         size_t size = 0;
  89         int bvec_idx = 0;
  90
  91         if (maxsize > iov_iter_count(iter))
  92                 maxsize = iov_iter_count(iter);
  93
  94         while (size < maxsize) {
  95                 struct page *pages[ITER_GET_BVECS_PAGES];
  96                 ssize_t bytes;
  97                 size_t start;
  98                 int idx = 0;
  99
 100                 bytes = iov_iter_get_pages2(iter, pages, maxsize - size,
 101                                            ITER_GET_BVECS_PAGES, &start);
 102                 if (bytes < 0)
 103                         return size ?: bytes;
 104
 105                 size += bytes;
 106
 107                 for ( ; bytes; idx++, bvec_idx++) {
 108                         int len = min_t(int, bytes, PAGE_SIZE - start);
 109
 110                         bvec_set_page(&bvecs[bvec_idx], pages[idx], len, start);
 111                         bytes -= len;
 112                         start = 0;
 113                 }
 114         }
 115
 116         return size;
 117 }
 118
 119 /*
 120  * iov_iter_get_pages() only considers one iov_iter segment, no matter
 121  * what maxsize or maxpages are given.  For ITER_BVEC that is a single
 122  * page.
 123  *
 124  * Attempt to get up to @maxsize bytes worth of pages from @iter.
 125  * Return the number of bytes in the created bio_vec array, or an error.
 126  */
 127 static ssize_t iter_get_bvecs_alloc(struct iov_iter *iter, size_t maxsize,
 128                                     struct bio_vec **bvecs, int *num_bvecs)
 129 {
 130         struct bio_vec *bv;
 131         size_t orig_count = iov_iter_count(iter);
 132         ssize_t bytes;
 133         int npages;
 134
 135         iov_iter_truncate(iter, maxsize);
 136         npages = iov_iter_npages(iter, INT_MAX);
 137         iov_iter_reexpand(iter, orig_count);
 138
 139         /*
 140          * __iter_get_bvecs() may populate only part of the array -- zero it
 141          * out.
 142          */
 143         bv = kvmalloc_array(npages, sizeof(*bv), GFP_KERNEL | __GFP_ZERO);
 144         if (!bv)
 145                 return -ENOMEM;
 146
 147         bytes = __iter_get_bvecs(iter, maxsize, bv);
 148         if (bytes < 0) {
 149                 /*
 150                  * No pages were pinned -- just free the array.
 151                  */
 152                 kvfree(bv);
 153                 return bytes;
 154         }
 155
 156         *bvecs = bv;
 157         *num_bvecs = npages;
 158         return bytes;
 159 }
 160
 161 static void put_bvecs(struct bio_vec *bvecs, int num_bvecs, bool should_dirty)
 162 {
 163         int i;
 164
 165         for (i = 0; i < num_bvecs; i++) {
 166                 if (bvecs[i].bv_page) {
 167                         if (should_dirty)
 168                                 set_page_dirty_lock(bvecs[i].bv_page);
 169                         put_page(bvecs[i].bv_page);
 170                 }
 171         }
 172         kvfree(bvecs);
 173 }
 174
 175 /*
 176  * Prepare an open request.  Preallocate ceph_cap to avoid an
 177  * inopportune ENOMEM later.
 178  */
 179 static struct ceph_mds_request *
 180 prepare_open_request(struct super_block *sb, int flags, int create_mode)
 181 {
 182         struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(sb);
 183         struct ceph_mds_request *req;
 184         int want_auth = USE_ANY_MDS;
 185         int op = (flags & O_CREAT) ? CEPH_MDS_OP_CREATE : CEPH_MDS_OP_OPEN;
 186
 187         if (flags & (O_WRONLY|O_RDWR|O_CREAT|O_TRUNC))
 188                 want_auth = USE_AUTH_MDS;
 189
 190         req = ceph_mdsc_create_request(mdsc, op, want_auth);
 191         if (IS_ERR(req))
 192                 goto out;
 193         req->r_fmode = ceph_flags_to_mode(flags);
 194         req->r_args.open.flags = ceph_flags_sys2wire(mdsc, flags);
 195         req->r_args.open.mode = cpu_to_le32(create_mode);
 196 out:
 197         return req;
 198 }
 199
 200 static int ceph_init_file_info(struct inode *inode, struct file *file,
 201                                         int fmode, bool isdir)
 202 {
 203         struct ceph_inode_info *ci = ceph_inode(inode);
 204         struct ceph_mount_options *opt =
 205                 ceph_inode_to_fs_client(&ci->netfs.inode)->mount_options;
 206         struct ceph_client *cl = ceph_inode_to_client(inode);
 207         struct ceph_file_info *fi;
 208         int ret;
 209
 210         doutc(cl, "%p %llx.%llx %p 0%o (%s)\n", inode, ceph_vinop(inode),
 211               file, inode->i_mode, isdir ? "dir" : "regular");
 212         BUG_ON(inode->i_fop->release != ceph_release);
 213
 214         if (isdir) {
 215                 struct ceph_dir_file_info *dfi =
 216                         kmem_cache_zalloc(ceph_dir_file_cachep, GFP_KERNEL);
 217                 if (!dfi)
 218                         return -ENOMEM;
 219
 220                 file->private_data = dfi;
 221                 fi = &dfi->file_info;
 222                 dfi->next_offset = 2;
 223                 dfi->readdir_cache_idx = -1;
 224         } else {
 225                 fi = kmem_cache_zalloc(ceph_file_cachep, GFP_KERNEL);
 226                 if (!fi)
 227                         return -ENOMEM;
 228
 229                 if (opt->flags & CEPH_MOUNT_OPT_NOPAGECACHE)
 230                         fi->flags |= CEPH_F_SYNC;
 231
 232                 file->private_data = fi;
 233         }
 234
 235         ceph_get_fmode(ci, fmode, 1);
 236         fi->fmode = fmode;
 237
 238         spin_lock_init(&fi->rw_contexts_lock);
 239         INIT_LIST_HEAD(&fi->rw_contexts);
 240         fi->filp_gen = READ_ONCE(ceph_inode_to_fs_client(inode)->filp_gen);
 241
 242         if ((file->f_mode & FMODE_WRITE) && ceph_has_inline_data(ci)) {
 243                 ret = ceph_uninline_data(file);
 244                 if (ret < 0)
 245                         goto error;
 246         }
 247
 248         return 0;
 249
 250 error:
 251         ceph_fscache_unuse_cookie(inode, file->f_mode & FMODE_WRITE);
 252         ceph_put_fmode(ci, fi->fmode, 1);
 253         kmem_cache_free(ceph_file_cachep, fi);
 254         /* wake up anyone waiting for caps on this inode */
 255         wake_up_all(&ci->i_cap_wq);
 256         return ret;
 257 }
 258
 259 /*
 260  * initialize private struct file data.
 261  * if we fail, clean up by dropping fmode reference on the ceph_inode
 262  */
 263 static int ceph_init_file(struct inode *inode, struct file *file, int fmode)
 264 {
 265         struct ceph_client *cl = ceph_inode_to_client(inode);
 266         int ret = 0;
 267
 268         switch (inode->i_mode & S_IFMT) {
 269         case S_IFREG:
 270                 ceph_fscache_use_cookie(inode, file->f_mode & FMODE_WRITE);
 271                 fallthrough;
 272         case S_IFDIR:
 273                 ret = ceph_init_file_info(inode, file, fmode,
 274                                                 S_ISDIR(inode->i_mode));
 275                 break;
 276
 277         case S_IFLNK:
 278                 doutc(cl, "%p %llx.%llx %p 0%o (symlink)\n", inode,
 279                       ceph_vinop(inode), file, inode->i_mode);
 280                 break;
 281
 282         default:
 283                 doutc(cl, "%p %llx.%llx %p 0%o (special)\n", inode,
 284                       ceph_vinop(inode), file, inode->i_mode);
 285                 /*
 286                  * we need to drop the open ref now, since we don't
 287                  * have .release set to ceph_release.
 288                  */
 289                 BUG_ON(inode->i_fop->release == ceph_release);
 290
 291                 /* call the proper open fop */
 292                 ret = inode->i_fop->open(inode, file);
 293         }
 294         return ret;
 295 }
 296
 297 /*
 298  * try renew caps after session gets killed.
 299  */
 300 int ceph_renew_caps(struct inode *inode, int fmode)
 301 {
 302         struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
 303         struct ceph_client *cl = mdsc->fsc->client;
 304         struct ceph_inode_info *ci = ceph_inode(inode);
 305         struct ceph_mds_request *req;
 306         int err, flags, wanted;
 307
 308         spin_lock(&ci->i_ceph_lock);
 309         __ceph_touch_fmode(ci, mdsc, fmode);
 310         wanted = __ceph_caps_file_wanted(ci);
 311         if (__ceph_is_any_real_caps(ci) &&
 312             (!(wanted & CEPH_CAP_ANY_WR) || ci->i_auth_cap)) {
 313                 int issued = __ceph_caps_issued(ci, NULL);
 314                 spin_unlock(&ci->i_ceph_lock);
 315                 doutc(cl, "%p %llx.%llx want %s issued %s updating mds_wanted\n",
 316                       inode, ceph_vinop(inode), ceph_cap_string(wanted),
 317                       ceph_cap_string(issued));
 318                 ceph_check_caps(ci, 0);
 319                 return 0;
 320         }
 321         spin_unlock(&ci->i_ceph_lock);
 322
 323         flags = 0;
 324         if ((wanted & CEPH_CAP_FILE_RD) && (wanted & CEPH_CAP_FILE_WR))
 325                 flags = O_RDWR;
 326         else if (wanted & CEPH_CAP_FILE_RD)
 327                 flags = O_RDONLY;
 328         else if (wanted & CEPH_CAP_FILE_WR)
 329                 flags = O_WRONLY;
 330 #ifdef O_LAZY
 331         if (wanted & CEPH_CAP_FILE_LAZYIO)
 332                 flags |= O_LAZY;
 333 #endif
 334
 335         req = prepare_open_request(inode->i_sb, flags, 0);
 336         if (IS_ERR(req)) {
 337                 err = PTR_ERR(req);
 338                 goto out;
 339         }
 340
 341         req->r_inode = inode;
 342         ihold(inode);
 343         req->r_num_caps = 1;
 344
 345         err = ceph_mdsc_do_request(mdsc, NULL, req);
 346         ceph_mdsc_put_request(req);
 347 out:
 348         doutc(cl, "%p %llx.%llx open result=%d\n", inode, ceph_vinop(inode),
 349               err);
 350         return err < 0 ? err : 0;
 351 }
 352
 353 /*
 354  * If we already have the requisite capabilities, we can satisfy
 355  * the open request locally (no need to request new caps from the
 356  * MDS).  We do, however, need to inform the MDS (asynchronously)
 357  * if our wanted caps set expands.
 358  */
 359 int ceph_open(struct inode *inode, struct file *file)
 360 {
 361         struct ceph_inode_info *ci = ceph_inode(inode);
 362         struct ceph_fs_client *fsc = ceph_sb_to_fs_client(inode->i_sb);
 363         struct ceph_client *cl = fsc->client;
 364         struct ceph_mds_client *mdsc = fsc->mdsc;
 365         struct ceph_mds_request *req;
 366         struct ceph_file_info *fi = file->private_data;
 367         int err;
 368         int flags, fmode, wanted;
 369
 370         if (fi) {
 371                 doutc(cl, "file %p is already opened\n", file);
 372                 return 0;
 373         }
 374
 375         /* filter out O_CREAT|O_EXCL; vfs did that already.  yuck. */
 376         flags = file->f_flags & ~(O_CREAT|O_EXCL);
 377         if (S_ISDIR(inode->i_mode)) {
 378                 flags = O_DIRECTORY;  /* mds likes to know */
 379         } else if (S_ISREG(inode->i_mode)) {
 380                 err = fscrypt_file_open(inode, file);
 381                 if (err)
 382                         return err;
 383         }
 384
 385         doutc(cl, "%p %llx.%llx file %p flags %d (%d)\n", inode,
 386               ceph_vinop(inode), file, flags, file->f_flags);
 387         fmode = ceph_flags_to_mode(flags);
 388         wanted = ceph_caps_for_mode(fmode);
 389
 390         /* snapped files are read-only */
 391         if (ceph_snap(inode) != CEPH_NOSNAP && (file->f_mode & FMODE_WRITE))
 392                 return -EROFS;
 393
 394         /* trivially open snapdir */
 395         if (ceph_snap(inode) == CEPH_SNAPDIR) {
 396                 return ceph_init_file(inode, file, fmode);
 397         }
 398
 399         /*
 400          * No need to block if we have caps on the auth MDS (for
 401          * write) or any MDS (for read).  Update wanted set
 402          * asynchronously.
 403          */
 404         spin_lock(&ci->i_ceph_lock);
 405         if (__ceph_is_any_real_caps(ci) &&
 406             (((fmode & CEPH_FILE_MODE_WR) == 0) || ci->i_auth_cap)) {
 407                 int mds_wanted = __ceph_caps_mds_wanted(ci, true);
 408                 int issued = __ceph_caps_issued(ci, NULL);
 409
 410                 doutc(cl, "open %p fmode %d want %s issued %s using existing\n",
 411                       inode, fmode, ceph_cap_string(wanted),
 412                       ceph_cap_string(issued));
 413                 __ceph_touch_fmode(ci, mdsc, fmode);
 414                 spin_unlock(&ci->i_ceph_lock);
 415
 416                 /* adjust wanted? */
 417                 if ((issued & wanted) != wanted &&
 418                     (mds_wanted & wanted) != wanted &&
 419                     ceph_snap(inode) != CEPH_SNAPDIR)
 420                         ceph_check_caps(ci, 0);
 421
 422                 return ceph_init_file(inode, file, fmode);
 423         } else if (ceph_snap(inode) != CEPH_NOSNAP &&
 424                    (ci->i_snap_caps & wanted) == wanted) {
 425                 __ceph_touch_fmode(ci, mdsc, fmode);
 426                 spin_unlock(&ci->i_ceph_lock);
 427                 return ceph_init_file(inode, file, fmode);
 428         }
 429
 430         spin_unlock(&ci->i_ceph_lock);
 431
 432         doutc(cl, "open fmode %d wants %s\n", fmode, ceph_cap_string(wanted));
 433         req = prepare_open_request(inode->i_sb, flags, 0);
 434         if (IS_ERR(req)) {
 435                 err = PTR_ERR(req);
 436                 goto out;
 437         }
 438         req->r_inode = inode;
 439         ihold(inode);
 440
 441         req->r_num_caps = 1;
 442         err = ceph_mdsc_do_request(mdsc, NULL, req);
 443         if (!err)
 444                 err = ceph_init_file(inode, file, req->r_fmode);
 445         ceph_mdsc_put_request(req);
 446         doutc(cl, "open result=%d on %llx.%llx\n", err, ceph_vinop(inode));
 447 out:
 448         return err;
 449 }
 450
 451 /* Clone the layout from a synchronous create, if the dir now has Dc caps */
 452 static void
 453 cache_file_layout(struct inode *dst, struct inode *src)
 454 {
 455         struct ceph_inode_info *cdst = ceph_inode(dst);
 456         struct ceph_inode_info *csrc = ceph_inode(src);
 457
 458         spin_lock(&cdst->i_ceph_lock);
 459         if ((__ceph_caps_issued(cdst, NULL) & CEPH_CAP_DIR_CREATE) &&
 460             !ceph_file_layout_is_valid(&cdst->i_cached_layout)) {
 461                 memcpy(&cdst->i_cached_layout, &csrc->i_layout,
 462                         sizeof(cdst->i_cached_layout));
 463                 rcu_assign_pointer(cdst->i_cached_layout.pool_ns,
 464                                    ceph_try_get_string(csrc->i_layout.pool_ns));
 465         }
 466         spin_unlock(&cdst->i_ceph_lock);
 467 }
 468
 469 /*
 470  * Try to set up an async create. We need caps, a file layout, and inode number,
 471  * and either a lease on the dentry or complete dir info. If any of those
 472  * criteria are not satisfied, then return false and the caller can go
 473  * synchronous.
 474  */
 475 static int try_prep_async_create(struct inode *dir, struct dentry *dentry,
 476                                  struct ceph_file_layout *lo, u64 *pino)
 477 {
 478         struct ceph_inode_info *ci = ceph_inode(dir);
 479         struct ceph_dentry_info *di = ceph_dentry(dentry);
 480         int got = 0, want = CEPH_CAP_FILE_EXCL | CEPH_CAP_DIR_CREATE;
 481         u64 ino;
 482
 483         spin_lock(&ci->i_ceph_lock);
 484         /* No auth cap means no chance for Dc caps */
 485         if (!ci->i_auth_cap)
 486                 goto no_async;
 487
 488         /* Any delegated inos? */
 489         if (xa_empty(&ci->i_auth_cap->session->s_delegated_inos))
 490                 goto no_async;
 491
 492         if (!ceph_file_layout_is_valid(&ci->i_cached_layout))
 493                 goto no_async;
 494
 495         if ((__ceph_caps_issued(ci, NULL) & want) != want)
 496                 goto no_async;
 497
 498         if (d_in_lookup(dentry)) {
 499                 if (!__ceph_dir_is_complete(ci))
 500                         goto no_async;
 501                 spin_lock(&dentry->d_lock);
 502                 di->lease_shared_gen = atomic_read(&ci->i_shared_gen);
 503                 spin_unlock(&dentry->d_lock);
 504         } else if (atomic_read(&ci->i_shared_gen) !=
 505                    READ_ONCE(di->lease_shared_gen)) {
 506                 goto no_async;
 507         }
 508
 509         ino = ceph_get_deleg_ino(ci->i_auth_cap->session);
 510         if (!ino)
 511                 goto no_async;
 512
 513         *pino = ino;
 514         ceph_take_cap_refs(ci, want, false);
 515         memcpy(lo, &ci->i_cached_layout, sizeof(*lo));
 516         rcu_assign_pointer(lo->pool_ns,
 517                            ceph_try_get_string(ci->i_cached_layout.pool_ns));
 518         got = want;
 519 no_async:
 520         spin_unlock(&ci->i_ceph_lock);
 521         return got;
 522 }
 523
 524 static void restore_deleg_ino(struct inode *dir, u64 ino)
 525 {
 526         struct ceph_client *cl = ceph_inode_to_client(dir);
 527         struct ceph_inode_info *ci = ceph_inode(dir);
 528         struct ceph_mds_session *s = NULL;
 529
 530         spin_lock(&ci->i_ceph_lock);
 531         if (ci->i_auth_cap)
 532                 s = ceph_get_mds_session(ci->i_auth_cap->session);
 533         spin_unlock(&ci->i_ceph_lock);
 534         if (s) {
 535                 int err = ceph_restore_deleg_ino(s, ino);
 536                 if (err)
 537                         pr_warn_client(cl,
 538                                 "unable to restore delegated ino 0x%llx to session: %d\n",
 539                                 ino, err);
 540                 ceph_put_mds_session(s);
 541         }
 542 }
 543
 544 static void wake_async_create_waiters(struct inode *inode,
 545                                       struct ceph_mds_session *session)
 546 {
 547         struct ceph_inode_info *ci = ceph_inode(inode);
 548         bool check_cap = false;
 549
 550         spin_lock(&ci->i_ceph_lock);
 551         if (ci->i_ceph_flags & CEPH_I_ASYNC_CREATE) {
 552                 ci->i_ceph_flags &= ~CEPH_I_ASYNC_CREATE;
 553                 wake_up_bit(&ci->i_ceph_flags, CEPH_ASYNC_CREATE_BIT);
 554
 555                 if (ci->i_ceph_flags & CEPH_I_ASYNC_CHECK_CAPS) {
 556                         ci->i_ceph_flags &= ~CEPH_I_ASYNC_CHECK_CAPS;
 557                         check_cap = true;
 558                 }
 559         }
 560         ceph_kick_flushing_inode_caps(session, ci);
 561         spin_unlock(&ci->i_ceph_lock);
 562
 563         if (check_cap)
 564                 ceph_check_caps(ci, CHECK_CAPS_FLUSH);
 565 }
 566
 567 static void ceph_async_create_cb(struct ceph_mds_client *mdsc,
 568                                  struct ceph_mds_request *req)
 569 {
 570         struct ceph_client *cl = mdsc->fsc->client;
 571         struct dentry *dentry = req->r_dentry;
 572         struct inode *dinode = d_inode(dentry);
 573         struct inode *tinode = req->r_target_inode;
 574         int result = req->r_err ? req->r_err :
 575                         le32_to_cpu(req->r_reply_info.head->result);
 576
 577         WARN_ON_ONCE(dinode && tinode && dinode != tinode);
 578
 579         /* MDS changed -- caller must resubmit */
 580         if (result == -EJUKEBOX)
 581                 goto out;
 582
 583         mapping_set_error(req->r_parent->i_mapping, result);
 584
 585         if (result) {
 586                 int pathlen = 0;
 587                 u64 base = 0;
 588                 char *path = ceph_mdsc_build_path(mdsc, req->r_dentry, &pathlen,
 589                                                   &base, 0);
 590
 591                 pr_warn_client(cl,
 592                         "async create failure path=(%llx)%s result=%d!\n",
 593                         base, IS_ERR(path) ? "<<bad>>" : path, result);
 594                 ceph_mdsc_free_path(path, pathlen);
 595
 596                 ceph_dir_clear_complete(req->r_parent);
 597                 if (!d_unhashed(dentry))
 598                         d_drop(dentry);
 599
 600                 if (dinode) {
 601                         mapping_set_error(dinode->i_mapping, result);
 602                         ceph_inode_shutdown(dinode);
 603                         wake_async_create_waiters(dinode, req->r_session);
 604                 }
 605         }
 606
 607         if (tinode) {
 608                 u64 ino = ceph_vino(tinode).ino;
 609
 610                 if (req->r_deleg_ino != ino)
 611                         pr_warn_client(cl,
 612                                 "inode number mismatch! err=%d deleg_ino=0x%llx target=0x%llx\n",
 613                                 req->r_err, req->r_deleg_ino, ino);
 614
 615                 mapping_set_error(tinode->i_mapping, result);
 616                 wake_async_create_waiters(tinode, req->r_session);
 617         } else if (!result) {
 618                 pr_warn_client(cl, "no req->r_target_inode for 0x%llx\n",
 619                                req->r_deleg_ino);
 620         }
 621 out:
 622         ceph_mdsc_release_dir_caps(req);
 623 }
 624
 625 static int ceph_finish_async_create(struct inode *dir, struct inode *inode,
 626                                     struct dentry *dentry,
 627                                     struct file *file, umode_t mode,
 628                                     struct ceph_mds_request *req,
 629                                     struct ceph_acl_sec_ctx *as_ctx,
 630                                     struct ceph_file_layout *lo)
 631 {
 632         int ret;
 633         char xattr_buf[4];
 634         struct ceph_mds_reply_inode in = { };
 635         struct ceph_mds_reply_info_in iinfo = { .in = &in };
 636         struct ceph_inode_info *ci = ceph_inode(dir);
 637         struct ceph_dentry_info *di = ceph_dentry(dentry);
 638         struct timespec64 now;
 639         struct ceph_string *pool_ns;
 640         struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb);
 641         struct ceph_client *cl = mdsc->fsc->client;
 642         struct ceph_vino vino = { .ino = req->r_deleg_ino,
 643                                   .snap = CEPH_NOSNAP };
 644
 645         ktime_get_real_ts64(&now);
 646
 647         iinfo.inline_version = CEPH_INLINE_NONE;
 648         iinfo.change_attr = 1;
 649         ceph_encode_timespec64(&iinfo.btime, &now);
 650
 651         if (req->r_pagelist) {
 652                 iinfo.xattr_len = req->r_pagelist->length;
 653                 iinfo.xattr_data = req->r_pagelist->mapped_tail;
 654         } else {
 655                 /* fake it */
 656                 iinfo.xattr_len = ARRAY_SIZE(xattr_buf);
 657                 iinfo.xattr_data = xattr_buf;
 658                 memset(iinfo.xattr_data, 0, iinfo.xattr_len);
 659         }
 660
 661         in.ino = cpu_to_le64(vino.ino);
 662         in.snapid = cpu_to_le64(CEPH_NOSNAP);
 663         in.version = cpu_to_le64(1);    // ???
 664         in.cap.caps = in.cap.wanted = cpu_to_le32(CEPH_CAP_ALL_FILE);
 665         in.cap.cap_id = cpu_to_le64(1);
 666         in.cap.realm = cpu_to_le64(ci->i_snap_realm->ino);
 667         in.cap.flags = CEPH_CAP_FLAG_AUTH;
 668         in.ctime = in.mtime = in.atime = iinfo.btime;
 669         in.truncate_seq = cpu_to_le32(1);
 670         in.truncate_size = cpu_to_le64(-1ULL);
 671         in.xattr_version = cpu_to_le64(1);
 672         in.uid = cpu_to_le32(from_kuid(&init_user_ns,
 673                                        mapped_fsuid(req->r_mnt_idmap,
 674                                                     &init_user_ns)));
 675         if (dir->i_mode & S_ISGID) {
 676                 in.gid = cpu_to_le32(from_kgid(&init_user_ns, dir->i_gid));
 677
 678                 /* Directories always inherit the setgid bit. */
 679                 if (S_ISDIR(mode))
 680                         mode |= S_ISGID;
 681         } else {
 682                 in.gid = cpu_to_le32(from_kgid(&init_user_ns,
 683                                      mapped_fsgid(req->r_mnt_idmap,
 684                                                   &init_user_ns)));
 685         }
 686         in.mode = cpu_to_le32((u32)mode);
 687
 688         in.nlink = cpu_to_le32(1);
 689         in.max_size = cpu_to_le64(lo->stripe_unit);
 690
 691         ceph_file_layout_to_legacy(lo, &in.layout);
 692         /* lo is private, so pool_ns can't change */
 693         pool_ns = rcu_dereference_raw(lo->pool_ns);
 694         if (pool_ns) {
 695                 iinfo.pool_ns_len = pool_ns->len;
 696                 iinfo.pool_ns_data = pool_ns->str;
 697         }
 698
 699         down_read(&mdsc->snap_rwsem);
 700         ret = ceph_fill_inode(inode, NULL, &iinfo, NULL, req->r_session,
 701                               req->r_fmode, NULL);
 702         up_read(&mdsc->snap_rwsem);
 703         if (ret) {
 704                 doutc(cl, "failed to fill inode: %d\n", ret);
 705                 ceph_dir_clear_complete(dir);
 706                 if (!d_unhashed(dentry))
 707                         d_drop(dentry);
 708                 discard_new_inode(inode);
 709         } else {
 710                 struct dentry *dn;
 711
 712                 doutc(cl, "d_adding new inode 0x%llx to 0x%llx/%s\n",
 713                       vino.ino, ceph_ino(dir), dentry->d_name.name);
 714                 ceph_dir_clear_ordered(dir);
 715                 ceph_init_inode_acls(inode, as_ctx);
 716                 if (inode->i_state & I_NEW) {
 717                         /*
 718                          * If it's not I_NEW, then someone created this before
 719                          * we got here. Assume the server is aware of it at
 720                          * that point and don't worry about setting
 721                          * CEPH_I_ASYNC_CREATE.
 722                          */
 723                         ceph_inode(inode)->i_ceph_flags = CEPH_I_ASYNC_CREATE;
 724                         unlock_new_inode(inode);
 725                 }
 726                 if (d_in_lookup(dentry) || d_really_is_negative(dentry)) {
 727                         if (!d_unhashed(dentry))
 728                                 d_drop(dentry);
 729                         dn = d_splice_alias(inode, dentry);
 730                         WARN_ON_ONCE(dn && dn != dentry);
 731                 }
 732                 file->f_mode |= FMODE_CREATED;
 733                 ret = finish_open(file, dentry, ceph_open);
 734         }
 735
 736         spin_lock(&dentry->d_lock);
 737         di->flags &= ~CEPH_DENTRY_ASYNC_CREATE;
 738         wake_up_bit(&di->flags, CEPH_DENTRY_ASYNC_CREATE_BIT);
 739         spin_unlock(&dentry->d_lock);
 740
 741         return ret;
 742 }
 743
 744 /*
 745  * Do a lookup + open with a single request.  If we get a non-existent
 746  * file or symlink, return 1 so the VFS can retry.
 747  */
 748 int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
 749                      struct file *file, unsigned flags, umode_t mode)
 750 {
 751         struct mnt_idmap *idmap = file_mnt_idmap(file);
 752         struct ceph_fs_client *fsc = ceph_sb_to_fs_client(dir->i_sb);
 753         struct ceph_client *cl = fsc->client;
 754         struct ceph_mds_client *mdsc = fsc->mdsc;
 755         struct ceph_mds_request *req;
 756         struct inode *new_inode = NULL;
 757         struct dentry *dn;
 758         struct ceph_acl_sec_ctx as_ctx = {};
 759         bool try_async = ceph_test_mount_opt(fsc, ASYNC_DIROPS);
 760         int mask;
 761         int err;
 762
 763         doutc(cl, "%p %llx.%llx dentry %p '%pd' %s flags %d mode 0%o\n",
 764               dir, ceph_vinop(dir), dentry, dentry,
 765               d_unhashed(dentry) ? "unhashed" : "hashed", flags, mode);
 766
 767         if (dentry->d_name.len > NAME_MAX)
 768                 return -ENAMETOOLONG;
 769
 770         err = ceph_wait_on_conflict_unlink(dentry);
 771         if (err)
 772                 return err;
 773         /*
 774          * Do not truncate the file, since atomic_open is called before the
 775          * permission check. The caller will do the truncation afterward.
 776          */
 777         flags &= ~O_TRUNC;
 778
 779 retry:
 780         if (flags & O_CREAT) {
 781                 if (ceph_quota_is_max_files_exceeded(dir))
 782                         return -EDQUOT;
 783
 784                 new_inode = ceph_new_inode(dir, dentry, &mode, &as_ctx);
 785                 if (IS_ERR(new_inode)) {
 786                         err = PTR_ERR(new_inode);
 787                         goto out_ctx;
 788                 }
 789                 /* Async create can't handle more than a page of xattrs */
 790                 if (as_ctx.pagelist &&
 791                     !list_is_singular(&as_ctx.pagelist->head))
 792                         try_async = false;
 793         } else if (!d_in_lookup(dentry)) {
 794                 /* If it's not being looked up, it's negative */
 795                 return -ENOENT;
 796         }
 797
 798         /* do the open */
 799         req = prepare_open_request(dir->i_sb, flags, mode);
 800         if (IS_ERR(req)) {
 801                 err = PTR_ERR(req);
 802                 goto out_ctx;
 803         }
 804         req->r_dentry = dget(dentry);
 805         req->r_num_caps = 2;
 806         mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
 807         if (ceph_security_xattr_wanted(dir))
 808                 mask |= CEPH_CAP_XATTR_SHARED;
 809         req->r_args.open.mask = cpu_to_le32(mask);
 810         req->r_parent = dir;
 811         if (req->r_op == CEPH_MDS_OP_CREATE)
 812                 req->r_mnt_idmap = mnt_idmap_get(idmap);
 813         ihold(dir);
 814         if (IS_ENCRYPTED(dir)) {
 815                 set_bit(CEPH_MDS_R_FSCRYPT_FILE, &req->r_req_flags);
 816                 err = fscrypt_prepare_lookup_partial(dir, dentry);
 817                 if (err < 0)
 818                         goto out_req;
 819         }
 820
 821         if (flags & O_CREAT) {
 822                 struct ceph_file_layout lo;
 823
 824                 req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL |
 825                                      CEPH_CAP_XATTR_EXCL;
 826                 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
 827
 828                 ceph_as_ctx_to_req(req, &as_ctx);
 829
 830                 if (try_async && (req->r_dir_caps =
 831                                   try_prep_async_create(dir, dentry, &lo,
 832                                                         &req->r_deleg_ino))) {
 833                         struct ceph_vino vino = { .ino = req->r_deleg_ino,
 834                                                   .snap = CEPH_NOSNAP };
 835                         struct ceph_dentry_info *di = ceph_dentry(dentry);
 836
 837                         set_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags);
 838                         req->r_args.open.flags |= cpu_to_le32(CEPH_O_EXCL);
 839                         req->r_callback = ceph_async_create_cb;
 840
 841                         /* Hash inode before RPC */
 842                         new_inode = ceph_get_inode(dir->i_sb, vino, new_inode);
 843                         if (IS_ERR(new_inode)) {
 844                                 err = PTR_ERR(new_inode);
 845                                 new_inode = NULL;
 846                                 goto out_req;
 847                         }
 848                         WARN_ON_ONCE(!(new_inode->i_state & I_NEW));
 849
 850                         spin_lock(&dentry->d_lock);
 851                         di->flags |= CEPH_DENTRY_ASYNC_CREATE;
 852                         spin_unlock(&dentry->d_lock);
 853
 854                         err = ceph_mdsc_submit_request(mdsc, dir, req);
 855                         if (!err) {
 856                                 err = ceph_finish_async_create(dir, new_inode,
 857                                                                dentry, file,
 858                                                                mode, req,
 859                                                                &as_ctx, &lo);
 860                                 new_inode = NULL;
 861                         } else if (err == -EJUKEBOX) {
 862                                 restore_deleg_ino(dir, req->r_deleg_ino);
 863                                 ceph_mdsc_put_request(req);
 864                                 discard_new_inode(new_inode);
 865                                 ceph_release_acl_sec_ctx(&as_ctx);
 866                                 memset(&as_ctx, 0, sizeof(as_ctx));
 867                                 new_inode = NULL;
 868                                 try_async = false;
 869                                 ceph_put_string(rcu_dereference_raw(lo.pool_ns));
 870                                 goto retry;
 871                         }
 872                         ceph_put_string(rcu_dereference_raw(lo.pool_ns));
 873                         goto out_req;
 874                 }
 875         }
 876
 877         set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
 878         req->r_new_inode = new_inode;
 879         new_inode = NULL;
 880         err = ceph_mdsc_do_request(mdsc, (flags & O_CREAT) ? dir : NULL, req);
 881         if (err == -ENOENT) {
 882                 dentry = ceph_handle_snapdir(req, dentry);
 883                 if (IS_ERR(dentry)) {
 884                         err = PTR_ERR(dentry);
 885                         goto out_req;
 886                 }
 887                 err = 0;
 888         }
 889
 890         if (!err && (flags & O_CREAT) && !req->r_reply_info.head->is_dentry)
 891                 err = ceph_handle_notrace_create(dir, dentry);
 892
 893         if (d_in_lookup(dentry)) {
 894                 dn = ceph_finish_lookup(req, dentry, err);
 895                 if (IS_ERR(dn))
 896                         err = PTR_ERR(dn);
 897         } else {
 898                 /* we were given a hashed negative dentry */
 899                 dn = NULL;
 900         }
 901         if (err)
 902                 goto out_req;
 903         if (dn || d_really_is_negative(dentry) || d_is_symlink(dentry)) {
 904                 /* make vfs retry on splice, ENOENT, or symlink */
 905                 doutc(cl, "finish_no_open on dn %p\n", dn);
 906                 err = finish_no_open(file, dn);
 907         } else {
 908                 if (IS_ENCRYPTED(dir) &&
 909                     !fscrypt_has_permitted_context(dir, d_inode(dentry))) {
 910                         pr_warn_client(cl,
 911                                 "Inconsistent encryption context (parent %llx:%llx child %llx:%llx)\n",
 912                                 ceph_vinop(dir), ceph_vinop(d_inode(dentry)));
 913                         goto out_req;
 914                 }
 915
 916                 doutc(cl, "finish_open on dn %p\n", dn);
 917                 if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) {
 918                         struct inode *newino = d_inode(dentry);
 919
 920                         cache_file_layout(dir, newino);
 921                         ceph_init_inode_acls(newino, &as_ctx);
 922                         file->f_mode |= FMODE_CREATED;
 923                 }
 924                 err = finish_open(file, dentry, ceph_open);
 925         }
 926 out_req:
 927         ceph_mdsc_put_request(req);
 928         iput(new_inode);
 929 out_ctx:
 930         ceph_release_acl_sec_ctx(&as_ctx);
 931         doutc(cl, "result=%d\n", err);
 932         return err;
 933 }
 934
 935 int ceph_release(struct inode *inode, struct file *file)
 936 {
 937         struct ceph_client *cl = ceph_inode_to_client(inode);
 938         struct ceph_inode_info *ci = ceph_inode(inode);
 939
 940         if (S_ISDIR(inode->i_mode)) {
 941                 struct ceph_dir_file_info *dfi = file->private_data;
 942                 doutc(cl, "%p %llx.%llx dir file %p\n", inode,
 943                       ceph_vinop(inode), file);
 944                 WARN_ON(!list_empty(&dfi->file_info.rw_contexts));
 945
 946                 ceph_put_fmode(ci, dfi->file_info.fmode, 1);
 947
 948                 if (dfi->last_readdir)
 949                         ceph_mdsc_put_request(dfi->last_readdir);
 950                 kfree(dfi->last_name);
 951                 kfree(dfi->dir_info);
 952                 kmem_cache_free(ceph_dir_file_cachep, dfi);
 953         } else {
 954                 struct ceph_file_info *fi = file->private_data;
 955                 doutc(cl, "%p %llx.%llx regular file %p\n", inode,
 956                       ceph_vinop(inode), file);
 957                 WARN_ON(!list_empty(&fi->rw_contexts));
 958
 959                 ceph_fscache_unuse_cookie(inode, file->f_mode & FMODE_WRITE);
 960                 ceph_put_fmode(ci, fi->fmode, 1);
 961
 962                 kmem_cache_free(ceph_file_cachep, fi);
 963         }
 964
 965         /* wake up anyone waiting for caps on this inode */
 966         wake_up_all(&ci->i_cap_wq);
 967         return 0;
 968 }
 969
 970 enum {
 971         HAVE_RETRIED = 1,
 972         CHECK_EOF =    2,
 973         READ_INLINE =  3,
 974 };
 975
 976 /*
 977  * Completely synchronous read and write methods.  Direct from __user
 978  * buffer to osd, or directly to user pages (if O_DIRECT).
 979  *
 980  * If the read spans object boundary, just do multiple reads.  (That's not
 981  * atomic, but good enough for now.)
 982  *
 983  * If we get a short result from the OSD, check against i_size; we need to
 984  * only return a short read to the caller if we hit EOF.
 985  */
 986 ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos,
 987                          struct iov_iter *to, int *retry_op,
 988                          u64 *last_objver)
 989 {
 990         struct ceph_inode_info *ci = ceph_inode(inode);
 991         struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
 992         struct ceph_client *cl = fsc->client;
 993         struct ceph_osd_client *osdc = &fsc->client->osdc;
 994         ssize_t ret;
 995         u64 off = *ki_pos;
 996         u64 len = iov_iter_count(to);
 997         u64 i_size = i_size_read(inode);
 998         bool sparse = IS_ENCRYPTED(inode) || ceph_test_mount_opt(fsc, SPARSEREAD);
 999         u64 objver = 0;
1000
1001         doutc(cl, "on inode %p %llx.%llx %llx~%llx\n", inode,
1002               ceph_vinop(inode), *ki_pos, len);
1003
1004         if (ceph_inode_is_shutdown(inode))
1005                 return -EIO;
1006
1007         if (!len)
1008                 return 0;
1009         /*
1010          * flush any page cache pages in this range.  this
1011          * will make concurrent normal and sync io slow,
1012          * but it will at least behave sensibly when they are
1013          * in sequence.
1014          */
1015         ret = filemap_write_and_wait_range(inode->i_mapping,
1016                                            off, off + len - 1);
1017         if (ret < 0)
1018                 return ret;
1019
1020         ret = 0;
1021         while ((len = iov_iter_count(to)) > 0) {
1022                 struct ceph_osd_request *req;
1023                 struct page **pages;
1024                 int num_pages;
1025                 size_t page_off;
1026                 bool more;
1027                 int idx;
1028                 size_t left;
1029                 struct ceph_osd_req_op *op;
1030                 u64 read_off = off;
1031                 u64 read_len = len;
1032                 int extent_cnt;
1033
1034                 /* determine new offset/length if encrypted */
1035                 ceph_fscrypt_adjust_off_and_len(inode, &read_off, &read_len);
1036
1037                 doutc(cl, "orig %llu~%llu reading %llu~%llu", off, len,
1038                       read_off, read_len);
1039
1040                 req = ceph_osdc_new_request(osdc, &ci->i_layout,
1041                                         ci->i_vino, read_off, &read_len, 0, 1,
1042                                         sparse ? CEPH_OSD_OP_SPARSE_READ :
1043                                                  CEPH_OSD_OP_READ,
1044                                         CEPH_OSD_FLAG_READ,
1045                                         NULL, ci->i_truncate_seq,
1046                                         ci->i_truncate_size, false);
1047                 if (IS_ERR(req)) {
1048                         ret = PTR_ERR(req);
1049                         break;
1050                 }
1051
1052                 /* adjust len downward if the request truncated the len */
1053                 if (off + len > read_off + read_len)
1054                         len = read_off + read_len - off;
1055                 more = len < iov_iter_count(to);
1056
1057                 num_pages = calc_pages_for(read_off, read_len);
1058                 page_off = offset_in_page(off);
1059                 pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
1060                 if (IS_ERR(pages)) {
1061                         ceph_osdc_put_request(req);
1062                         ret = PTR_ERR(pages);
1063                         break;
1064                 }
1065
1066                 osd_req_op_extent_osd_data_pages(req, 0, pages, read_len,
1067                                                  offset_in_page(read_off),
1068                                                  false, false);
1069
1070                 op = &req->r_ops[0];
1071                 if (sparse) {
1072                         extent_cnt = __ceph_sparse_read_ext_count(inode, read_len);
1073                         ret = ceph_alloc_sparse_ext_map(op, extent_cnt);
1074                         if (ret) {
1075                                 ceph_osdc_put_request(req);
1076                                 break;
1077                         }
1078                 }
1079
1080                 ceph_osdc_start_request(osdc, req);
1081                 ret = ceph_osdc_wait_request(osdc, req);
1082
1083                 ceph_update_read_metrics(&fsc->mdsc->metric,
1084                                          req->r_start_latency,
1085                                          req->r_end_latency,
1086                                          read_len, ret);
1087
1088                 if (ret > 0)
1089                         objver = req->r_version;
1090
1091                 i_size = i_size_read(inode);
1092                 doutc(cl, "%llu~%llu got %zd i_size %llu%s\n", off, len,
1093                       ret, i_size, (more ? " MORE" : ""));
1094
1095                 /* Fix it to go to end of extent map */
1096                 if (sparse && ret >= 0)
1097                         ret = ceph_sparse_ext_map_end(op);
1098                 else if (ret == -ENOENT)
1099                         ret = 0;
1100
1101                 if (ret > 0 && IS_ENCRYPTED(inode)) {
1102                         int fret;
1103
1104                         fret = ceph_fscrypt_decrypt_extents(inode, pages,
1105                                         read_off, op->extent.sparse_ext,
1106                                         op->extent.sparse_ext_cnt);
1107                         if (fret < 0) {
1108                                 ret = fret;
1109                                 ceph_osdc_put_request(req);
1110                                 break;
1111                         }
1112
1113                         /* account for any partial block at the beginning */
1114                         fret -= (off - read_off);
1115
1116                         /*
1117                          * Short read after big offset adjustment?
1118                          * Nothing is usable, just call it a zero
1119                          * len read.
1120                          */
1121                         fret = max(fret, 0);
1122
1123                         /* account for partial block at the end */
1124                         ret = min_t(ssize_t, fret, len);
1125                 }
1126
1127                 ceph_osdc_put_request(req);
1128
1129                 /* Short read but not EOF? Zero out the remainder. */
1130                 if (ret >= 0 && ret < len && (off + ret < i_size)) {
1131                         int zlen = min(len - ret, i_size - off - ret);
1132                         int zoff = page_off + ret;
1133
1134                         doutc(cl, "zero gap %llu~%llu\n", off + ret,
1135                               off + ret + zlen);
1136                         ceph_zero_page_vector_range(zoff, zlen, pages);
1137                         ret += zlen;
1138                 }
1139
1140                 idx = 0;
1141                 if (ret <= 0)
1142                         left = 0;
1143                 else if (off + ret > i_size)
1144                         left = i_size - off;
1145                 else
1146                         left = ret;
1147                 while (left > 0) {
1148                         size_t plen, copied;
1149
1150                         plen = min_t(size_t, left, PAGE_SIZE - page_off);
1151                         SetPageUptodate(pages[idx]);
1152                         copied = copy_page_to_iter(pages[idx++],
1153                                                    page_off, plen, to);
1154                         off += copied;
1155                         left -= copied;
1156                         page_off = 0;
1157                         if (copied < plen) {
1158                                 ret = -EFAULT;
1159                                 break;
1160                         }
1161                 }
1162                 ceph_release_page_vector(pages, num_pages);
1163
1164                 if (ret < 0) {
1165                         if (ret == -EBLOCKLISTED)
1166                                 fsc->blocklisted = true;
1167                         break;
1168                 }
1169
1170                 if (off >= i_size || !more)
1171                         break;
1172         }
1173
1174         if (ret > 0) {
1175                 if (off >= i_size) {
1176                         *retry_op = CHECK_EOF;
1177                         ret = i_size - *ki_pos;
1178                         *ki_pos = i_size;
1179                 } else {
1180                         ret = off - *ki_pos;
1181                         *ki_pos = off;
1182                 }
1183
1184                 if (last_objver)
1185                         *last_objver = objver;
1186         }
1187         doutc(cl, "result %zd retry_op %d\n", ret, *retry_op);
1188         return ret;
1189 }
1190
1191 static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *to,
1192                               int *retry_op)
1193 {
1194         struct file *file = iocb->ki_filp;
1195         struct inode *inode = file_inode(file);
1196         struct ceph_client *cl = ceph_inode_to_client(inode);
1197
1198         doutc(cl, "on file %p %llx~%zx %s\n", file, iocb->ki_pos,
1199               iov_iter_count(to),
1200               (file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
1201
1202         return __ceph_sync_read(inode, &iocb->ki_pos, to, retry_op, NULL);
1203 }
1204
1205 struct ceph_aio_request {
1206         struct kiocb *iocb;
1207         size_t total_len;
1208         bool write;
1209         bool should_dirty;
1210         int error;
1211         struct list_head osd_reqs;
1212         unsigned num_reqs;
1213         atomic_t pending_reqs;
1214         struct timespec64 mtime;
1215         struct ceph_cap_flush *prealloc_cf;
1216 };
1217
1218 struct ceph_aio_work {
1219         struct work_struct work;
1220         struct ceph_osd_request *req;
1221 };
1222
1223 static void ceph_aio_retry_work(struct work_struct *work);
1224
1225 static void ceph_aio_complete(struct inode *inode,
1226                               struct ceph_aio_request *aio_req)
1227 {
1228         struct ceph_client *cl = ceph_inode_to_client(inode);
1229         struct ceph_inode_info *ci = ceph_inode(inode);
1230         int ret;
1231
1232         if (!atomic_dec_and_test(&aio_req->pending_reqs))
1233                 return;
1234
1235         if (aio_req->iocb->ki_flags & IOCB_DIRECT)
1236                 inode_dio_end(inode);
1237
1238         ret = aio_req->error;
1239         if (!ret)
1240                 ret = aio_req->total_len;
1241
1242         doutc(cl, "%p %llx.%llx rc %d\n", inode, ceph_vinop(inode), ret);
1243
1244         if (ret >= 0 && aio_req->write) {
1245                 int dirty;
1246
1247                 loff_t endoff = aio_req->iocb->ki_pos + aio_req->total_len;
1248                 if (endoff > i_size_read(inode)) {
1249                         if (ceph_inode_set_size(inode, endoff))
1250                                 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY);
1251                 }
1252
1253                 spin_lock(&ci->i_ceph_lock);
1254                 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1255                                                &aio_req->prealloc_cf);
1256                 spin_unlock(&ci->i_ceph_lock);
1257                 if (dirty)
1258                         __mark_inode_dirty(inode, dirty);
1259
1260         }
1261
1262         ceph_put_cap_refs(ci, (aio_req->write ? CEPH_CAP_FILE_WR :
1263                                                 CEPH_CAP_FILE_RD));
1264
1265         aio_req->iocb->ki_complete(aio_req->iocb, ret);
1266
1267         ceph_free_cap_flush(aio_req->prealloc_cf);
1268         kfree(aio_req);
1269 }
1270
1271 static void ceph_aio_complete_req(struct ceph_osd_request *req)
1272 {
1273         int rc = req->r_result;
1274         struct inode *inode = req->r_inode;
1275         struct ceph_aio_request *aio_req = req->r_priv;
1276         struct ceph_osd_data *osd_data = osd_req_op_extent_osd_data(req, 0);
1277         struct ceph_osd_req_op *op = &req->r_ops[0];
1278         struct ceph_client_metric *metric = &ceph_sb_to_mdsc(inode->i_sb)->metric;
1279         unsigned int len = osd_data->bvec_pos.iter.bi_size;
1280         bool sparse = (op->op == CEPH_OSD_OP_SPARSE_READ);
1281         struct ceph_client *cl = ceph_inode_to_client(inode);
1282
1283         BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_BVECS);
1284         BUG_ON(!osd_data->num_bvecs);
1285
1286         doutc(cl, "req %p inode %p %llx.%llx, rc %d bytes %u\n", req,
1287               inode, ceph_vinop(inode), rc, len);
1288
1289         if (rc == -EOLDSNAPC) {
1290                 struct ceph_aio_work *aio_work;
1291                 BUG_ON(!aio_req->write);
1292
1293                 aio_work = kmalloc(sizeof(*aio_work), GFP_NOFS);
1294                 if (aio_work) {
1295                         INIT_WORK(&aio_work->work, ceph_aio_retry_work);
1296                         aio_work->req = req;
1297                         queue_work(ceph_inode_to_fs_client(inode)->inode_wq,
1298                                    &aio_work->work);
1299                         return;
1300                 }
1301                 rc = -ENOMEM;
1302         } else if (!aio_req->write) {
1303                 if (sparse && rc >= 0)
1304                         rc = ceph_sparse_ext_map_end(op);
1305                 if (rc == -ENOENT)
1306                         rc = 0;
1307                 if (rc >= 0 && len > rc) {
1308                         struct iov_iter i;
1309                         int zlen = len - rc;
1310
1311                         /*
1312                          * If read is satisfied by single OSD request,
1313                          * it can pass EOF. Otherwise read is within
1314                          * i_size.
1315                          */
1316                         if (aio_req->num_reqs == 1) {
1317                                 loff_t i_size = i_size_read(inode);
1318                                 loff_t endoff = aio_req->iocb->ki_pos + rc;
1319                                 if (endoff < i_size)
1320                                         zlen = min_t(size_t, zlen,
1321                                                      i_size - endoff);
1322                                 aio_req->total_len = rc + zlen;
1323                         }
1324
1325                         iov_iter_bvec(&i, ITER_DEST, osd_data->bvec_pos.bvecs,
1326                                       osd_data->num_bvecs, len);
1327                         iov_iter_advance(&i, rc);
1328                         iov_iter_zero(zlen, &i);
1329                 }
1330         }
1331
1332         /* r_start_latency == 0 means the request was not submitted */
1333         if (req->r_start_latency) {
1334                 if (aio_req->write)
1335                         ceph_update_write_metrics(metric, req->r_start_latency,
1336                                                   req->r_end_latency, len, rc);
1337                 else
1338                         ceph_update_read_metrics(metric, req->r_start_latency,
1339                                                  req->r_end_latency, len, rc);
1340         }
1341
1342         put_bvecs(osd_data->bvec_pos.bvecs, osd_data->num_bvecs,
1343                   aio_req->should_dirty);
1344         ceph_osdc_put_request(req);
1345
1346         if (rc < 0)
1347                 cmpxchg(&aio_req->error, 0, rc);
1348
1349         ceph_aio_complete(inode, aio_req);
1350         return;
1351 }
1352
1353 static void ceph_aio_retry_work(struct work_struct *work)
1354 {
1355         struct ceph_aio_work *aio_work =
1356                 container_of(work, struct ceph_aio_work, work);
1357         struct ceph_osd_request *orig_req = aio_work->req;
1358         struct ceph_aio_request *aio_req = orig_req->r_priv;
1359         struct inode *inode = orig_req->r_inode;
1360         struct ceph_inode_info *ci = ceph_inode(inode);
1361         struct ceph_snap_context *snapc;
1362         struct ceph_osd_request *req;
1363         int ret;
1364
1365         spin_lock(&ci->i_ceph_lock);
1366         if (__ceph_have_pending_cap_snap(ci)) {
1367                 struct ceph_cap_snap *capsnap =
1368                         list_last_entry(&ci->i_cap_snaps,
1369                                         struct ceph_cap_snap,
1370                                         ci_item);
1371                 snapc = ceph_get_snap_context(capsnap->context);
1372         } else {
1373                 BUG_ON(!ci->i_head_snapc);
1374                 snapc = ceph_get_snap_context(ci->i_head_snapc);
1375         }
1376         spin_unlock(&ci->i_ceph_lock);
1377
1378         req = ceph_osdc_alloc_request(orig_req->r_osdc, snapc, 1,
1379                         false, GFP_NOFS);
1380         if (!req) {
1381                 ret = -ENOMEM;
1382                 req = orig_req;
1383                 goto out;
1384         }
1385
1386         req->r_flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE;
1387         ceph_oloc_copy(&req->r_base_oloc, &orig_req->r_base_oloc);
1388         ceph_oid_copy(&req->r_base_oid, &orig_req->r_base_oid);
1389
1390         req->r_ops[0] = orig_req->r_ops[0];
1391
1392         req->r_mtime = aio_req->mtime;
1393         req->r_data_offset = req->r_ops[0].extent.offset;
1394
1395         ret = ceph_osdc_alloc_messages(req, GFP_NOFS);
1396         if (ret) {
1397                 ceph_osdc_put_request(req);
1398                 req = orig_req;
1399                 goto out;
1400         }
1401
1402         ceph_osdc_put_request(orig_req);
1403
1404         req->r_callback = ceph_aio_complete_req;
1405         req->r_inode = inode;
1406         req->r_priv = aio_req;
1407
1408         ceph_osdc_start_request(req->r_osdc, req);
1409 out:
1410         if (ret < 0) {
1411                 req->r_result = ret;
1412                 ceph_aio_complete_req(req);
1413         }
1414
1415         ceph_put_snap_context(snapc);
1416         kfree(aio_work);
1417 }
1418
1419 static ssize_t
1420 ceph_direct_read_write(struct kiocb *iocb, struct iov_iter *iter,
1421                        struct ceph_snap_context *snapc,
1422                        struct ceph_cap_flush **pcf)
1423 {
1424         struct file *file = iocb->ki_filp;
1425         struct inode *inode = file_inode(file);
1426         struct ceph_inode_info *ci = ceph_inode(inode);
1427         struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
1428         struct ceph_client *cl = fsc->client;
1429         struct ceph_client_metric *metric = &fsc->mdsc->metric;
1430         struct ceph_vino vino;
1431         struct ceph_osd_request *req;
1432         struct bio_vec *bvecs;
1433         struct ceph_aio_request *aio_req = NULL;
1434         int num_pages = 0;
1435         int flags;
1436         int ret = 0;
1437         struct timespec64 mtime = current_time(inode);
1438         size_t count = iov_iter_count(iter);
1439         loff_t pos = iocb->ki_pos;
1440         bool write = iov_iter_rw(iter) == WRITE;
1441         bool should_dirty = !write && user_backed_iter(iter);
1442         bool sparse = ceph_test_mount_opt(fsc, SPARSEREAD);
1443
1444         if (write && ceph_snap(file_inode(file)) != CEPH_NOSNAP)
1445                 return -EROFS;
1446
1447         doutc(cl, "sync_direct_%s on file %p %lld~%u snapc %p seq %lld\n",
1448               (write ? "write" : "read"), file, pos, (unsigned)count,
1449               snapc, snapc ? snapc->seq : 0);
1450
1451         if (write) {
1452                 int ret2;
1453
1454                 ceph_fscache_invalidate(inode, true);
1455
1456                 ret2 = invalidate_inode_pages2_range(inode->i_mapping,
1457                                         pos >> PAGE_SHIFT,
1458                                         (pos + count - 1) >> PAGE_SHIFT);
1459                 if (ret2 < 0)
1460                         doutc(cl, "invalidate_inode_pages2_range returned %d\n",
1461                               ret2);
1462
1463                 flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE;
1464         } else {
1465                 flags = CEPH_OSD_FLAG_READ;
1466         }
1467
1468         while (iov_iter_count(iter) > 0) {
1469                 u64 size = iov_iter_count(iter);
1470                 ssize_t len;
1471                 struct ceph_osd_req_op *op;
1472                 int readop = sparse ? CEPH_OSD_OP_SPARSE_READ : CEPH_OSD_OP_READ;
1473                 int extent_cnt;
1474
1475                 if (write)
1476                         size = min_t(u64, size, fsc->mount_options->wsize);
1477                 else
1478                         size = min_t(u64, size, fsc->mount_options->rsize);
1479
1480                 vino = ceph_vino(inode);
1481                 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1482                                             vino, pos, &size, 0,
1483                                             1,
1484                                             write ? CEPH_OSD_OP_WRITE : readop,
1485                                             flags, snapc,
1486                                             ci->i_truncate_seq,
1487                                             ci->i_truncate_size,
1488                                             false);
1489                 if (IS_ERR(req)) {
1490                         ret = PTR_ERR(req);
1491                         break;
1492                 }
1493
1494                 len = iter_get_bvecs_alloc(iter, size, &bvecs, &num_pages);
1495                 if (len < 0) {
1496                         ceph_osdc_put_request(req);
1497                         ret = len;
1498                         break;
1499                 }
1500                 if (len != size)
1501                         osd_req_op_extent_update(req, 0, len);
1502
1503                 /*
1504                  * To simplify error handling, allow AIO when IO within i_size
1505                  * or IO can be satisfied by single OSD request.
1506                  */
1507                 if (pos == iocb->ki_pos && !is_sync_kiocb(iocb) &&
1508                     (len == count || pos + count <= i_size_read(inode))) {
1509                         aio_req = kzalloc(sizeof(*aio_req), GFP_KERNEL);
1510                         if (aio_req) {
1511                                 aio_req->iocb = iocb;
1512                                 aio_req->write = write;
1513                                 aio_req->should_dirty = should_dirty;
1514                                 INIT_LIST_HEAD(&aio_req->osd_reqs);
1515                                 if (write) {
1516                                         aio_req->mtime = mtime;
1517                                         swap(aio_req->prealloc_cf, *pcf);
1518                                 }
1519                         }
1520                         /* ignore error */
1521                 }
1522
1523                 if (write) {
1524                         /*
1525                          * throw out any page cache pages in this range. this
1526                          * may block.
1527                          */
1528                         truncate_inode_pages_range(inode->i_mapping, pos,
1529                                                    PAGE_ALIGN(pos + len) - 1);
1530
1531                         req->r_mtime = mtime;
1532                 }
1533
1534                 osd_req_op_extent_osd_data_bvecs(req, 0, bvecs, num_pages, len);
1535                 op = &req->r_ops[0];
1536                 if (sparse) {
1537                         extent_cnt = __ceph_sparse_read_ext_count(inode, size);
1538                         ret = ceph_alloc_sparse_ext_map(op, extent_cnt);
1539                         if (ret) {
1540                                 ceph_osdc_put_request(req);
1541                                 break;
1542                         }
1543                 }
1544
1545                 if (aio_req) {
1546                         aio_req->total_len += len;
1547                         aio_req->num_reqs++;
1548                         atomic_inc(&aio_req->pending_reqs);
1549
1550                         req->r_callback = ceph_aio_complete_req;
1551                         req->r_inode = inode;
1552                         req->r_priv = aio_req;
1553                         list_add_tail(&req->r_private_item, &aio_req->osd_reqs);
1554
1555                         pos += len;
1556                         continue;
1557                 }
1558
1559                 ceph_osdc_start_request(req->r_osdc, req);
1560                 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1561
1562                 if (write)
1563                         ceph_update_write_metrics(metric, req->r_start_latency,
1564                                                   req->r_end_latency, len, ret);
1565                 else
1566                         ceph_update_read_metrics(metric, req->r_start_latency,
1567                                                  req->r_end_latency, len, ret);
1568
1569                 size = i_size_read(inode);
1570                 if (!write) {
1571                         if (sparse && ret >= 0)
1572                                 ret = ceph_sparse_ext_map_end(op);
1573                         else if (ret == -ENOENT)
1574                                 ret = 0;
1575
1576                         if (ret >= 0 && ret < len && pos + ret < size) {
1577                                 struct iov_iter i;
1578                                 int zlen = min_t(size_t, len - ret,
1579                                                  size - pos - ret);
1580
1581                                 iov_iter_bvec(&i, ITER_DEST, bvecs, num_pages, len);
1582                                 iov_iter_advance(&i, ret);
1583                                 iov_iter_zero(zlen, &i);
1584                                 ret += zlen;
1585                         }
1586                         if (ret >= 0)
1587                                 len = ret;
1588                 }
1589
1590                 put_bvecs(bvecs, num_pages, should_dirty);
1591                 ceph_osdc_put_request(req);
1592                 if (ret < 0)
1593                         break;
1594
1595                 pos += len;
1596                 if (!write && pos >= size)
1597                         break;
1598
1599                 if (write && pos > size) {
1600                         if (ceph_inode_set_size(inode, pos))
1601                                 ceph_check_caps(ceph_inode(inode),
1602                                                 CHECK_CAPS_AUTHONLY);
1603                 }
1604         }
1605
1606         if (aio_req) {
1607                 LIST_HEAD(osd_reqs);
1608
1609                 if (aio_req->num_reqs == 0) {
1610                         kfree(aio_req);
1611                         return ret;
1612                 }
1613
1614                 ceph_get_cap_refs(ci, write ? CEPH_CAP_FILE_WR :
1615                                               CEPH_CAP_FILE_RD);
1616
1617                 list_splice(&aio_req->osd_reqs, &osd_reqs);
1618                 inode_dio_begin(inode);
1619                 while (!list_empty(&osd_reqs)) {
1620                         req = list_first_entry(&osd_reqs,
1621                                                struct ceph_osd_request,
1622                                                r_private_item);
1623                         list_del_init(&req->r_private_item);
1624                         if (ret >= 0)
1625                                 ceph_osdc_start_request(req->r_osdc, req);
1626                         if (ret < 0) {
1627                                 req->r_result = ret;
1628                                 ceph_aio_complete_req(req);
1629                         }
1630                 }
1631                 return -EIOCBQUEUED;
1632         }
1633
1634         if (ret != -EOLDSNAPC && pos > iocb->ki_pos) {
1635                 ret = pos - iocb->ki_pos;
1636                 iocb->ki_pos = pos;
1637         }
1638         return ret;
1639 }
1640
1641 /*
1642  * Synchronous write, straight from __user pointer or user pages.
1643  *
1644  * If write spans object boundary, just do multiple writes.  (For a
1645  * correct atomic write, we should e.g. take write locks on all
1646  * objects, rollback on failure, etc.)
1647  */
1648 static ssize_t
1649 ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos,
1650                 struct ceph_snap_context *snapc)
1651 {
1652         struct file *file = iocb->ki_filp;
1653         struct inode *inode = file_inode(file);
1654         struct ceph_inode_info *ci = ceph_inode(inode);
1655         struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
1656         struct ceph_client *cl = fsc->client;
1657         struct ceph_osd_client *osdc = &fsc->client->osdc;
1658         struct ceph_osd_request *req;
1659         struct page **pages;
1660         u64 len;
1661         int num_pages;
1662         int written = 0;
1663         int ret;
1664         bool check_caps = false;
1665         struct timespec64 mtime = current_time(inode);
1666         size_t count = iov_iter_count(from);
1667
1668         if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
1669                 return -EROFS;
1670
1671         doutc(cl, "on file %p %lld~%u snapc %p seq %lld\n", file, pos,
1672               (unsigned)count, snapc, snapc->seq);
1673
1674         ret = filemap_write_and_wait_range(inode->i_mapping,
1675                                            pos, pos + count - 1);
1676         if (ret < 0)
1677                 return ret;
1678
1679         ceph_fscache_invalidate(inode, false);
1680
1681         while ((len = iov_iter_count(from)) > 0) {
1682                 size_t left;
1683                 int n;
1684                 u64 write_pos = pos;
1685                 u64 write_len = len;
1686                 u64 objnum, objoff;
1687                 u32 xlen;
1688                 u64 assert_ver = 0;
1689                 bool rmw;
1690                 bool first, last;
1691                 struct iov_iter saved_iter = *from;
1692                 size_t off;
1693
1694                 ceph_fscrypt_adjust_off_and_len(inode, &write_pos, &write_len);
1695
1696                 /* clamp the length to the end of first object */
1697                 ceph_calc_file_object_mapping(&ci->i_layout, write_pos,
1698                                               write_len, &objnum, &objoff,
1699                                               &xlen);
1700                 write_len = xlen;
1701
1702                 /* adjust len downward if it goes beyond current object */
1703                 if (pos + len > write_pos + write_len)
1704                         len = write_pos + write_len - pos;
1705
1706                 /*
1707                  * If we had to adjust the length or position to align with a
1708                  * crypto block, then we must do a read/modify/write cycle. We
1709                  * use a version assertion to redrive the thing if something
1710                  * changes in between.
1711                  */
1712                 first = pos != write_pos;
1713                 last = (pos + len) != (write_pos + write_len);
1714                 rmw = first || last;
1715
1716                 doutc(cl, "ino %llx %lld~%llu adjusted %lld~%llu -- %srmw\n",
1717                       ci->i_vino.ino, pos, len, write_pos, write_len,
1718                       rmw ? "" : "no ");
1719
1720                 /*
1721                  * The data is emplaced into the page as it would be if it were
1722                  * in an array of pagecache pages.
1723                  */
1724                 num_pages = calc_pages_for(write_pos, write_len);
1725                 pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
1726                 if (IS_ERR(pages)) {
1727                         ret = PTR_ERR(pages);
1728                         break;
1729                 }
1730
1731                 /* Do we need to preload the pages? */
1732                 if (rmw) {
1733                         u64 first_pos = write_pos;
1734                         u64 last_pos = (write_pos + write_len) - CEPH_FSCRYPT_BLOCK_SIZE;
1735                         u64 read_len = CEPH_FSCRYPT_BLOCK_SIZE;
1736                         struct ceph_osd_req_op *op;
1737
1738                         /* We should only need to do this for encrypted inodes */
1739                         WARN_ON_ONCE(!IS_ENCRYPTED(inode));
1740
1741                         /* No need to do two reads if first and last blocks are same */
1742                         if (first && last_pos == first_pos)
1743                                 last = false;
1744
1745                         /*
1746                          * Allocate a read request for one or two extents,
1747                          * depending on how the request was aligned.
1748                          */
1749                         req = ceph_osdc_new_request(osdc, &ci->i_layout,
1750                                         ci->i_vino, first ? first_pos : last_pos,
1751                                         &read_len, 0, (first && last) ? 2 : 1,
1752                                         CEPH_OSD_OP_SPARSE_READ, CEPH_OSD_FLAG_READ,
1753                                         NULL, ci->i_truncate_seq,
1754                                         ci->i_truncate_size, false);
1755                         if (IS_ERR(req)) {
1756                                 ceph_release_page_vector(pages, num_pages);
1757                                 ret = PTR_ERR(req);
1758                                 break;
1759                         }
1760
1761                         /* Something is misaligned! */
1762                         if (read_len != CEPH_FSCRYPT_BLOCK_SIZE) {
1763                                 ceph_osdc_put_request(req);
1764                                 ceph_release_page_vector(pages, num_pages);
1765                                 ret = -EIO;
1766                                 break;
1767                         }
1768
1769                         /* Add extent for first block? */
1770                         op = &req->r_ops[0];
1771
1772                         if (first) {
1773                                 osd_req_op_extent_osd_data_pages(req, 0, pages,
1774                                                          CEPH_FSCRYPT_BLOCK_SIZE,
1775                                                          offset_in_page(first_pos),
1776                                                          false, false);
1777                                 /* We only expect a single extent here */
1778                                 ret = __ceph_alloc_sparse_ext_map(op, 1);
1779                                 if (ret) {
1780                                         ceph_osdc_put_request(req);
1781                                         ceph_release_page_vector(pages, num_pages);
1782                                         break;
1783                                 }
1784                         }
1785
1786                         /* Add extent for last block */
1787                         if (last) {
1788                                 /* Init the other extent if first extent has been used */
1789                                 if (first) {
1790                                         op = &req->r_ops[1];
1791                                         osd_req_op_extent_init(req, 1,
1792                                                         CEPH_OSD_OP_SPARSE_READ,
1793                                                         last_pos, CEPH_FSCRYPT_BLOCK_SIZE,
1794                                                         ci->i_truncate_size,
1795                                                         ci->i_truncate_seq);
1796                                 }
1797
1798                                 ret = __ceph_alloc_sparse_ext_map(op, 1);
1799                                 if (ret) {
1800                                         ceph_osdc_put_request(req);
1801                                         ceph_release_page_vector(pages, num_pages);
1802                                         break;
1803                                 }
1804
1805                                 osd_req_op_extent_osd_data_pages(req, first ? 1 : 0,
1806                                                         &pages[num_pages - 1],
1807                                                         CEPH_FSCRYPT_BLOCK_SIZE,
1808                                                         offset_in_page(last_pos),
1809                                                         false, false);
1810                         }
1811
1812                         ceph_osdc_start_request(osdc, req);
1813                         ret = ceph_osdc_wait_request(osdc, req);
1814
1815                         /* FIXME: length field is wrong if there are 2 extents */
1816                         ceph_update_read_metrics(&fsc->mdsc->metric,
1817                                                  req->r_start_latency,
1818                                                  req->r_end_latency,
1819                                                  read_len, ret);
1820
1821                         /* Ok if object is not already present */
1822                         if (ret == -ENOENT) {
1823                                 /*
1824                                  * If there is no object, then we can't assert
1825                                  * on its version. Set it to 0, and we'll use an
1826                                  * exclusive create instead.
1827                                  */
1828                                 ceph_osdc_put_request(req);
1829                                 ret = 0;
1830
1831                                 /*
1832                                  * zero out the soon-to-be uncopied parts of the
1833                                  * first and last pages.
1834                                  */
1835                                 if (first)
1836                                         zero_user_segment(pages[0], 0,
1837                                                           offset_in_page(first_pos));
1838                                 if (last)
1839                                         zero_user_segment(pages[num_pages - 1],
1840                                                           offset_in_page(last_pos),
1841                                                           PAGE_SIZE);
1842                         } else {
1843                                 if (ret < 0) {
1844                                         ceph_osdc_put_request(req);
1845                                         ceph_release_page_vector(pages, num_pages);
1846                                         break;
1847                                 }
1848
1849                                 op = &req->r_ops[0];
1850                                 if (op->extent.sparse_ext_cnt == 0) {
1851                                         if (first)
1852                                                 zero_user_segment(pages[0], 0,
1853                                                                   offset_in_page(first_pos));
1854                                         else
1855                                                 zero_user_segment(pages[num_pages - 1],
1856                                                                   offset_in_page(last_pos),
1857                                                                   PAGE_SIZE);
1858                                 } else if (op->extent.sparse_ext_cnt != 1 ||
1859                                            ceph_sparse_ext_map_end(op) !=
1860                                                 CEPH_FSCRYPT_BLOCK_SIZE) {
1861                                         ret = -EIO;
1862                                         ceph_osdc_put_request(req);
1863                                         ceph_release_page_vector(pages, num_pages);
1864                                         break;
1865                                 }
1866
1867                                 if (first && last) {
1868                                         op = &req->r_ops[1];
1869                                         if (op->extent.sparse_ext_cnt == 0) {
1870                                                 zero_user_segment(pages[num_pages - 1],
1871                                                                   offset_in_page(last_pos),
1872                                                                   PAGE_SIZE);
1873                                         } else if (op->extent.sparse_ext_cnt != 1 ||
1874                                                    ceph_sparse_ext_map_end(op) !=
1875                                                         CEPH_FSCRYPT_BLOCK_SIZE) {
1876                                                 ret = -EIO;
1877                                                 ceph_osdc_put_request(req);
1878                                                 ceph_release_page_vector(pages, num_pages);
1879                                                 break;
1880                                         }
1881                                 }
1882
1883                                 /* Grab assert version. It must be non-zero. */
1884                                 assert_ver = req->r_version;
1885                                 WARN_ON_ONCE(ret > 0 && assert_ver == 0);
1886
1887                                 ceph_osdc_put_request(req);
1888                                 if (first) {
1889                                         ret = ceph_fscrypt_decrypt_block_inplace(inode,
1890                                                         pages[0], CEPH_FSCRYPT_BLOCK_SIZE,
1891                                                         offset_in_page(first_pos),
1892                                                         first_pos >> CEPH_FSCRYPT_BLOCK_SHIFT);
1893                                         if (ret < 0) {
1894                                                 ceph_release_page_vector(pages, num_pages);
1895                                                 break;
1896                                         }
1897                                 }
1898                                 if (last) {
1899                                         ret = ceph_fscrypt_decrypt_block_inplace(inode,
1900                                                         pages[num_pages - 1],
1901                                                         CEPH_FSCRYPT_BLOCK_SIZE,
1902                                                         offset_in_page(last_pos),
1903                                                         last_pos >> CEPH_FSCRYPT_BLOCK_SHIFT);
1904                                         if (ret < 0) {
1905                                                 ceph_release_page_vector(pages, num_pages);
1906                                                 break;
1907                                         }
1908                                 }
1909                         }
1910                 }
1911
1912                 left = len;
1913                 off = offset_in_page(pos);
1914                 for (n = 0; n < num_pages; n++) {
1915                         size_t plen = min_t(size_t, left, PAGE_SIZE - off);
1916
1917                         /* copy the data */
1918                         ret = copy_page_from_iter(pages[n], off, plen, from);
1919                         if (ret != plen) {
1920                                 ret = -EFAULT;
1921                                 break;
1922                         }
1923                         off = 0;
1924                         left -= ret;
1925                 }
1926                 if (ret < 0) {
1927                         doutc(cl, "write failed with %d\n", ret);
1928                         ceph_release_page_vector(pages, num_pages);
1929                         break;
1930                 }
1931
1932                 if (IS_ENCRYPTED(inode)) {
1933                         ret = ceph_fscrypt_encrypt_pages(inode, pages,
1934                                                          write_pos, write_len,
1935                                                          GFP_KERNEL);
1936                         if (ret < 0) {
1937                                 doutc(cl, "encryption failed with %d\n", ret);
1938                                 ceph_release_page_vector(pages, num_pages);
1939                                 break;
1940                         }
1941                 }
1942
1943                 req = ceph_osdc_new_request(osdc, &ci->i_layout,
1944                                             ci->i_vino, write_pos, &write_len,
1945                                             rmw ? 1 : 0, rmw ? 2 : 1,
1946                                             CEPH_OSD_OP_WRITE,
1947                                             CEPH_OSD_FLAG_WRITE,
1948                                             snapc, ci->i_truncate_seq,
1949                                             ci->i_truncate_size, false);
1950                 if (IS_ERR(req)) {
1951                         ret = PTR_ERR(req);
1952                         ceph_release_page_vector(pages, num_pages);
1953                         break;
1954                 }
1955
1956                 doutc(cl, "write op %lld~%llu\n", write_pos, write_len);
1957                 osd_req_op_extent_osd_data_pages(req, rmw ? 1 : 0, pages, write_len,
1958                                                  offset_in_page(write_pos), false,
1959                                                  true);
1960                 req->r_inode = inode;
1961                 req->r_mtime = mtime;
1962
1963                 /* Set up the assertion */
1964                 if (rmw) {
1965                         /*
1966                          * Set up the assertion. If we don't have a version
1967                          * number, then the object doesn't exist yet. Use an
1968                          * exclusive create instead of a version assertion in
1969                          * that case.
1970                          */
1971                         if (assert_ver) {
1972                                 osd_req_op_init(req, 0, CEPH_OSD_OP_ASSERT_VER, 0);
1973                                 req->r_ops[0].assert_ver.ver = assert_ver;
1974                         } else {
1975                                 osd_req_op_init(req, 0, CEPH_OSD_OP_CREATE,
1976                                                 CEPH_OSD_OP_FLAG_EXCL);
1977                         }
1978                 }
1979
1980                 ceph_osdc_start_request(osdc, req);
1981                 ret = ceph_osdc_wait_request(osdc, req);
1982
1983                 ceph_update_write_metrics(&fsc->mdsc->metric, req->r_start_latency,
1984                                           req->r_end_latency, len, ret);
1985                 ceph_osdc_put_request(req);
1986                 if (ret != 0) {
1987                         doutc(cl, "osd write returned %d\n", ret);
1988                         /* Version changed! Must re-do the rmw cycle */
1989                         if ((assert_ver && (ret == -ERANGE || ret == -EOVERFLOW)) ||
1990                             (!assert_ver && ret == -EEXIST)) {
1991                                 /* We should only ever see this on a rmw */
1992                                 WARN_ON_ONCE(!rmw);
1993
1994                                 /* The version should never go backward */
1995                                 WARN_ON_ONCE(ret == -EOVERFLOW);
1996
1997                                 *from = saved_iter;
1998
1999                                 /* FIXME: limit number of times we loop? */
2000                                 continue;
2001                         }
2002                         ceph_set_error_write(ci);
2003                         break;
2004                 }
2005
2006                 ceph_clear_error_write(ci);
2007
2008                 /*
2009                  * We successfully wrote to a range of the file. Declare
2010                  * that region of the pagecache invalid.
2011                  */
2012                 ret = invalidate_inode_pages2_range(
2013                                 inode->i_mapping,
2014                                 pos >> PAGE_SHIFT,
2015                                 (pos + len - 1) >> PAGE_SHIFT);
2016                 if (ret < 0) {
2017                         doutc(cl, "invalidate_inode_pages2_range returned %d\n",
2018                               ret);
2019                         ret = 0;
2020                 }
2021                 pos += len;
2022                 written += len;
2023                 doutc(cl, "written %d\n", written);
2024                 if (pos > i_size_read(inode)) {
2025                         check_caps = ceph_inode_set_size(inode, pos);
2026                         if (check_caps)
2027                                 ceph_check_caps(ceph_inode(inode),
2028                                                 CHECK_CAPS_AUTHONLY);
2029                 }
2030
2031         }
2032
2033         if (ret != -EOLDSNAPC && written > 0) {
2034                 ret = written;
2035                 iocb->ki_pos = pos;
2036         }
2037         doutc(cl, "returning %d\n", ret);
2038         return ret;
2039 }
2040
2041 /*
2042  * Wrap generic_file_aio_read with checks for cap bits on the inode.
2043  * Atomically grab references, so that those bits are not released
2044  * back to the MDS mid-read.
2045  *
2046  * Hmm, the sync read case isn't actually async... should it be?
2047  */
2048 static ssize_t ceph_read_iter(struct kiocb *iocb, struct iov_iter *to)
2049 {
2050         struct file *filp = iocb->ki_filp;
2051         struct ceph_file_info *fi = filp->private_data;
2052         size_t len = iov_iter_count(to);
2053         struct inode *inode = file_inode(filp);
2054         struct ceph_inode_info *ci = ceph_inode(inode);
2055         bool direct_lock = iocb->ki_flags & IOCB_DIRECT;
2056         struct ceph_client *cl = ceph_inode_to_client(inode);
2057         ssize_t ret;
2058         int want = 0, got = 0;
2059         int retry_op = 0, read = 0;
2060
2061 again:
2062         doutc(cl, "%llu~%u trying to get caps on %p %llx.%llx\n",
2063               iocb->ki_pos, (unsigned)len, inode, ceph_vinop(inode));
2064
2065         if (ceph_inode_is_shutdown(inode))
2066                 return -ESTALE;
2067
2068         if (direct_lock)
2069                 ceph_start_io_direct(inode);
2070         else
2071                 ceph_start_io_read(inode);
2072
2073         if (!(fi->flags & CEPH_F_SYNC) && !direct_lock)
2074                 want |= CEPH_CAP_FILE_CACHE;
2075         if (fi->fmode & CEPH_FILE_MODE_LAZY)
2076                 want |= CEPH_CAP_FILE_LAZYIO;
2077
2078         ret = ceph_get_caps(filp, CEPH_CAP_FILE_RD, want, -1, &got);
2079         if (ret < 0) {
2080                 if (direct_lock)
2081                         ceph_end_io_direct(inode);
2082                 else
2083                         ceph_end_io_read(inode);
2084                 return ret;
2085         }
2086
2087         if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 ||
2088             (iocb->ki_flags & IOCB_DIRECT) ||
2089             (fi->flags & CEPH_F_SYNC)) {
2090
2091                 doutc(cl, "sync %p %llx.%llx %llu~%u got cap refs on %s\n",
2092                       inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
2093                       ceph_cap_string(got));
2094
2095                 if (!ceph_has_inline_data(ci)) {
2096                         if (!retry_op &&
2097                             (iocb->ki_flags & IOCB_DIRECT) &&
2098                             !IS_ENCRYPTED(inode)) {
2099                                 ret = ceph_direct_read_write(iocb, to,
2100                                                              NULL, NULL);
2101                                 if (ret >= 0 && ret < len)
2102                                         retry_op = CHECK_EOF;
2103                         } else {
2104                                 ret = ceph_sync_read(iocb, to, &retry_op);
2105                         }
2106                 } else {
2107                         retry_op = READ_INLINE;
2108                 }
2109         } else {
2110                 CEPH_DEFINE_RW_CONTEXT(rw_ctx, got);
2111                 doutc(cl, "async %p %llx.%llx %llu~%u got cap refs on %s\n",
2112                       inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
2113                       ceph_cap_string(got));
2114                 ceph_add_rw_context(fi, &rw_ctx);
2115                 ret = generic_file_read_iter(iocb, to);
2116                 ceph_del_rw_context(fi, &rw_ctx);
2117         }
2118
2119         doutc(cl, "%p %llx.%llx dropping cap refs on %s = %d\n",
2120               inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret);
2121         ceph_put_cap_refs(ci, got);
2122
2123         if (direct_lock)
2124                 ceph_end_io_direct(inode);
2125         else
2126                 ceph_end_io_read(inode);
2127
2128         if (retry_op > HAVE_RETRIED && ret >= 0) {
2129                 int statret;
2130                 struct page *page = NULL;
2131                 loff_t i_size;
2132                 int mask = CEPH_STAT_CAP_SIZE;
2133                 if (retry_op == READ_INLINE) {
2134                         page = __page_cache_alloc(GFP_KERNEL);
2135                         if (!page)
2136                                 return -ENOMEM;
2137
2138                         mask = CEPH_STAT_CAP_INLINE_DATA;
2139                 }
2140
2141                 statret = __ceph_do_getattr(inode, page, mask, !!page);
2142                 if (statret < 0) {
2143                         if (page)
2144                                 __free_page(page);
2145                         if (statret == -ENODATA) {
2146                                 BUG_ON(retry_op != READ_INLINE);
2147                                 goto again;
2148                         }
2149                         return statret;
2150                 }
2151
2152                 i_size = i_size_read(inode);
2153                 if (retry_op == READ_INLINE) {
2154                         BUG_ON(ret > 0 || read > 0);
2155                         if (iocb->ki_pos < i_size &&
2156                             iocb->ki_pos < PAGE_SIZE) {
2157                                 loff_t end = min_t(loff_t, i_size,
2158                                                    iocb->ki_pos + len);
2159                                 end = min_t(loff_t, end, PAGE_SIZE);
2160                                 if (statret < end)
2161                                         zero_user_segment(page, statret, end);
2162                                 ret = copy_page_to_iter(page,
2163                                                 iocb->ki_pos & ~PAGE_MASK,
2164                                                 end - iocb->ki_pos, to);
2165                                 iocb->ki_pos += ret;
2166                                 read += ret;
2167                         }
2168                         if (iocb->ki_pos < i_size && read < len) {
2169                                 size_t zlen = min_t(size_t, len - read,
2170                                                     i_size - iocb->ki_pos);
2171                                 ret = iov_iter_zero(zlen, to);
2172                                 iocb->ki_pos += ret;
2173                                 read += ret;
2174                         }
2175                         __free_pages(page, 0);
2176                         return read;
2177                 }
2178
2179                 /* hit EOF or hole? */
2180                 if (retry_op == CHECK_EOF && iocb->ki_pos < i_size &&
2181                     ret < len) {
2182                         doutc(cl, "may hit hole, ppos %lld < size %lld, reading more\n",
2183                               iocb->ki_pos, i_size);
2184
2185                         read += ret;
2186                         len -= ret;
2187                         retry_op = HAVE_RETRIED;
2188                         goto again;
2189                 }
2190         }
2191
2192         if (ret >= 0)
2193                 ret += read;
2194
2195         return ret;
2196 }
2197
2198 /*
2199  * Wrap filemap_splice_read with checks for cap bits on the inode.
2200  * Atomically grab references, so that those bits are not released
2201  * back to the MDS mid-read.
2202  */
2203 static ssize_t ceph_splice_read(struct file *in, loff_t *ppos,
2204                                 struct pipe_inode_info *pipe,
2205                                 size_t len, unsigned int flags)
2206 {
2207         struct ceph_file_info *fi = in->private_data;
2208         struct inode *inode = file_inode(in);
2209         struct ceph_inode_info *ci = ceph_inode(inode);
2210         ssize_t ret;
2211         int want = 0, got = 0;
2212         CEPH_DEFINE_RW_CONTEXT(rw_ctx, 0);
2213
2214         dout("splice_read %p %llx.%llx %llu~%zu trying to get caps on %p\n",
2215              inode, ceph_vinop(inode), *ppos, len, inode);
2216
2217         if (ceph_inode_is_shutdown(inode))
2218                 return -ESTALE;
2219
2220         if (ceph_has_inline_data(ci) ||
2221             (fi->flags & CEPH_F_SYNC))
2222                 return copy_splice_read(in, ppos, pipe, len, flags);
2223
2224         ceph_start_io_read(inode);
2225
2226         want = CEPH_CAP_FILE_CACHE;
2227         if (fi->fmode & CEPH_FILE_MODE_LAZY)
2228                 want |= CEPH_CAP_FILE_LAZYIO;
2229
2230         ret = ceph_get_caps(in, CEPH_CAP_FILE_RD, want, -1, &got);
2231         if (ret < 0)
2232                 goto out_end;
2233
2234         if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) == 0) {
2235                 dout("splice_read/sync %p %llx.%llx %llu~%zu got cap refs on %s\n",
2236                      inode, ceph_vinop(inode), *ppos, len,
2237                      ceph_cap_string(got));
2238
2239                 ceph_put_cap_refs(ci, got);
2240                 ceph_end_io_read(inode);
2241                 return copy_splice_read(in, ppos, pipe, len, flags);
2242         }
2243
2244         dout("splice_read %p %llx.%llx %llu~%zu got cap refs on %s\n",
2245              inode, ceph_vinop(inode), *ppos, len, ceph_cap_string(got));
2246
2247         rw_ctx.caps = got;
2248         ceph_add_rw_context(fi, &rw_ctx);
2249         ret = filemap_splice_read(in, ppos, pipe, len, flags);
2250         ceph_del_rw_context(fi, &rw_ctx);
2251
2252         dout("splice_read %p %llx.%llx dropping cap refs on %s = %zd\n",
2253              inode, ceph_vinop(inode), ceph_cap_string(got), ret);
2254
2255         ceph_put_cap_refs(ci, got);
2256 out_end:
2257         ceph_end_io_read(inode);
2258         return ret;
2259 }
2260
2261 /*
2262  * Take cap references to avoid releasing caps to MDS mid-write.
2263  *
2264  * If we are synchronous, and write with an old snap context, the OSD
2265  * may return EOLDSNAPC.  In that case, retry the write.. _after_
2266  * dropping our cap refs and allowing the pending snap to logically
2267  * complete _before_ this write occurs.
2268  *
2269  * If we are near ENOSPC, write synchronously.
2270  */
2271 static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from)
2272 {
2273         struct file *file = iocb->ki_filp;
2274         struct ceph_file_info *fi = file->private_data;
2275         struct inode *inode = file_inode(file);
2276         struct ceph_inode_info *ci = ceph_inode(inode);
2277         struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
2278         struct ceph_client *cl = fsc->client;
2279         struct ceph_osd_client *osdc = &fsc->client->osdc;
2280         struct ceph_cap_flush *prealloc_cf;
2281         ssize_t count, written = 0;
2282         int err, want = 0, got;
2283         bool direct_lock = false;
2284         u32 map_flags;
2285         u64 pool_flags;
2286         loff_t pos;
2287         loff_t limit = max(i_size_read(inode), fsc->max_file_size);
2288
2289         if (ceph_inode_is_shutdown(inode))
2290                 return -ESTALE;
2291
2292         if (ceph_snap(inode) != CEPH_NOSNAP)
2293                 return -EROFS;
2294
2295         prealloc_cf = ceph_alloc_cap_flush();
2296         if (!prealloc_cf)
2297                 return -ENOMEM;
2298
2299         if ((iocb->ki_flags & (IOCB_DIRECT | IOCB_APPEND)) == IOCB_DIRECT)
2300                 direct_lock = true;
2301
2302 retry_snap:
2303         if (direct_lock)
2304                 ceph_start_io_direct(inode);
2305         else
2306                 ceph_start_io_write(inode);
2307
2308         if (iocb->ki_flags & IOCB_APPEND) {
2309                 err = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
2310                 if (err < 0)
2311                         goto out;
2312         }
2313
2314         err = generic_write_checks(iocb, from);
2315         if (err <= 0)
2316                 goto out;
2317
2318         pos = iocb->ki_pos;
2319         if (unlikely(pos >= limit)) {
2320                 err = -EFBIG;
2321                 goto out;
2322         } else {
2323                 iov_iter_truncate(from, limit - pos);
2324         }
2325
2326         count = iov_iter_count(from);
2327         if (ceph_quota_is_max_bytes_exceeded(inode, pos + count)) {
2328                 err = -EDQUOT;
2329                 goto out;
2330         }
2331
2332         down_read(&osdc->lock);
2333         map_flags = osdc->osdmap->flags;
2334         pool_flags = ceph_pg_pool_flags(osdc->osdmap, ci->i_layout.pool_id);
2335         up_read(&osdc->lock);
2336         if ((map_flags & CEPH_OSDMAP_FULL) ||
2337             (pool_flags & CEPH_POOL_FLAG_FULL)) {
2338                 err = -ENOSPC;
2339                 goto out;
2340         }
2341
2342         err = file_remove_privs(file);
2343         if (err)
2344                 goto out;
2345
2346         doutc(cl, "%p %llx.%llx %llu~%zd getting caps. i_size %llu\n",
2347               inode, ceph_vinop(inode), pos, count,
2348               i_size_read(inode));
2349         if (!(fi->flags & CEPH_F_SYNC) && !direct_lock)
2350                 want |= CEPH_CAP_FILE_BUFFER;
2351         if (fi->fmode & CEPH_FILE_MODE_LAZY)
2352                 want |= CEPH_CAP_FILE_LAZYIO;
2353         got = 0;
2354         err = ceph_get_caps(file, CEPH_CAP_FILE_WR, want, pos + count, &got);
2355         if (err < 0)
2356                 goto out;
2357
2358         err = file_update_time(file);
2359         if (err)
2360                 goto out_caps;
2361
2362         inode_inc_iversion_raw(inode);
2363
2364         doutc(cl, "%p %llx.%llx %llu~%zd got cap refs on %s\n",
2365               inode, ceph_vinop(inode), pos, count, ceph_cap_string(got));
2366
2367         if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 ||
2368             (iocb->ki_flags & IOCB_DIRECT) || (fi->flags & CEPH_F_SYNC) ||
2369             (ci->i_ceph_flags & CEPH_I_ERROR_WRITE)) {
2370                 struct ceph_snap_context *snapc;
2371                 struct iov_iter data;
2372
2373                 spin_lock(&ci->i_ceph_lock);
2374                 if (__ceph_have_pending_cap_snap(ci)) {
2375                         struct ceph_cap_snap *capsnap =
2376                                         list_last_entry(&ci->i_cap_snaps,
2377                                                         struct ceph_cap_snap,
2378                                                         ci_item);
2379                         snapc = ceph_get_snap_context(capsnap->context);
2380                 } else {
2381                         BUG_ON(!ci->i_head_snapc);
2382                         snapc = ceph_get_snap_context(ci->i_head_snapc);
2383                 }
2384                 spin_unlock(&ci->i_ceph_lock);
2385
2386                 /* we might need to revert back to that point */
2387                 data = *from;
2388                 if ((iocb->ki_flags & IOCB_DIRECT) && !IS_ENCRYPTED(inode))
2389                         written = ceph_direct_read_write(iocb, &data, snapc,
2390                                                          &prealloc_cf);
2391                 else
2392                         written = ceph_sync_write(iocb, &data, pos, snapc);
2393                 if (direct_lock)
2394                         ceph_end_io_direct(inode);
2395                 else
2396                         ceph_end_io_write(inode);
2397                 if (written > 0)
2398                         iov_iter_advance(from, written);
2399                 ceph_put_snap_context(snapc);
2400         } else {
2401                 /*
2402                  * No need to acquire the i_truncate_mutex. Because
2403                  * the MDS revokes Fwb caps before sending truncate
2404                  * message to us. We can't get Fwb cap while there
2405                  * are pending vmtruncate. So write and vmtruncate
2406                  * can not run at the same time
2407                  */
2408                 written = generic_perform_write(iocb, from);
2409                 ceph_end_io_write(inode);
2410         }
2411
2412         if (written >= 0) {
2413                 int dirty;
2414
2415                 spin_lock(&ci->i_ceph_lock);
2416                 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
2417                                                &prealloc_cf);
2418                 spin_unlock(&ci->i_ceph_lock);
2419                 if (dirty)
2420                         __mark_inode_dirty(inode, dirty);
2421                 if (ceph_quota_is_max_bytes_approaching(inode, iocb->ki_pos))
2422                         ceph_check_caps(ci, CHECK_CAPS_FLUSH);
2423         }
2424
2425         doutc(cl, "%p %llx.%llx %llu~%u  dropping cap refs on %s\n",
2426               inode, ceph_vinop(inode), pos, (unsigned)count,
2427               ceph_cap_string(got));
2428         ceph_put_cap_refs(ci, got);
2429
2430         if (written == -EOLDSNAPC) {
2431                 doutc(cl, "%p %llx.%llx %llu~%u" "got EOLDSNAPC, retrying\n",
2432                       inode, ceph_vinop(inode), pos, (unsigned)count);
2433                 goto retry_snap;
2434         }
2435
2436         if (written >= 0) {
2437                 if ((map_flags & CEPH_OSDMAP_NEARFULL) ||
2438                     (pool_flags & CEPH_POOL_FLAG_NEARFULL))
2439                         iocb->ki_flags |= IOCB_DSYNC;
2440                 written = generic_write_sync(iocb, written);
2441         }
2442
2443         goto out_unlocked;
2444 out_caps:
2445         ceph_put_cap_refs(ci, got);
2446 out:
2447         if (direct_lock)
2448                 ceph_end_io_direct(inode);
2449         else
2450                 ceph_end_io_write(inode);
2451 out_unlocked:
2452         ceph_free_cap_flush(prealloc_cf);
2453         return written ? written : err;
2454 }
2455
2456 /*
2457  * llseek.  be sure to verify file size on SEEK_END.
2458  */
2459 static loff_t ceph_llseek(struct file *file, loff_t offset, int whence)
2460 {
2461         if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) {
2462                 struct inode *inode = file_inode(file);
2463                 int ret;
2464
2465                 ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
2466                 if (ret < 0)
2467                         return ret;
2468         }
2469         return generic_file_llseek(file, offset, whence);
2470 }
2471
2472 static inline void ceph_zero_partial_page(
2473         struct inode *inode, loff_t offset, unsigned size)
2474 {
2475         struct page *page;
2476         pgoff_t index = offset >> PAGE_SHIFT;
2477
2478         page = find_lock_page(inode->i_mapping, index);
2479         if (page) {
2480                 wait_on_page_writeback(page);
2481                 zero_user(page, offset & (PAGE_SIZE - 1), size);
2482                 unlock_page(page);
2483                 put_page(page);
2484         }
2485 }
2486
2487 static void ceph_zero_pagecache_range(struct inode *inode, loff_t offset,
2488                                       loff_t length)
2489 {
2490         loff_t nearly = round_up(offset, PAGE_SIZE);
2491         if (offset < nearly) {
2492                 loff_t size = nearly - offset;
2493                 if (length < size)
2494                         size = length;
2495                 ceph_zero_partial_page(inode, offset, size);
2496                 offset += size;
2497                 length -= size;
2498         }
2499         if (length >= PAGE_SIZE) {
2500                 loff_t size = round_down(length, PAGE_SIZE);
2501                 truncate_pagecache_range(inode, offset, offset + size - 1);
2502                 offset += size;
2503                 length -= size;
2504         }
2505         if (length)
2506                 ceph_zero_partial_page(inode, offset, length);
2507 }
2508
2509 static int ceph_zero_partial_object(struct inode *inode,
2510                                     loff_t offset, loff_t *length)
2511 {
2512         struct ceph_inode_info *ci = ceph_inode(inode);
2513         struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
2514         struct ceph_osd_request *req;
2515         int ret = 0;
2516         loff_t zero = 0;
2517         int op;
2518
2519         if (ceph_inode_is_shutdown(inode))
2520                 return -EIO;
2521
2522         if (!length) {
2523                 op = offset ? CEPH_OSD_OP_DELETE : CEPH_OSD_OP_TRUNCATE;
2524                 length = &zero;
2525         } else {
2526                 op = CEPH_OSD_OP_ZERO;
2527         }
2528
2529         req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
2530                                         ceph_vino(inode),
2531                                         offset, length,
2532                                         0, 1, op,
2533                                         CEPH_OSD_FLAG_WRITE,
2534                                         NULL, 0, 0, false);
2535         if (IS_ERR(req)) {
2536                 ret = PTR_ERR(req);
2537                 goto out;
2538         }
2539
2540         req->r_mtime = inode_get_mtime(inode);
2541         ceph_osdc_start_request(&fsc->client->osdc, req);
2542         ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
2543         if (ret == -ENOENT)
2544                 ret = 0;
2545         ceph_osdc_put_request(req);
2546
2547 out:
2548         return ret;
2549 }
2550
2551 static int ceph_zero_objects(struct inode *inode, loff_t offset, loff_t length)
2552 {
2553         int ret = 0;
2554         struct ceph_inode_info *ci = ceph_inode(inode);
2555         s32 stripe_unit = ci->i_layout.stripe_unit;
2556         s32 stripe_count = ci->i_layout.stripe_count;
2557         s32 object_size = ci->i_layout.object_size;
2558         u64 object_set_size = object_size * stripe_count;
2559         u64 nearly, t;
2560
2561         /* round offset up to next period boundary */
2562         nearly = offset + object_set_size - 1;
2563         t = nearly;
2564         nearly -= do_div(t, object_set_size);
2565
2566         while (length && offset < nearly) {
2567                 loff_t size = length;
2568                 ret = ceph_zero_partial_object(inode, offset, &size);
2569                 if (ret < 0)
2570                         return ret;
2571                 offset += size;
2572                 length -= size;
2573         }
2574         while (length >= object_set_size) {
2575                 int i;
2576                 loff_t pos = offset;
2577                 for (i = 0; i < stripe_count; ++i) {
2578                         ret = ceph_zero_partial_object(inode, pos, NULL);
2579                         if (ret < 0)
2580                                 return ret;
2581                         pos += stripe_unit;
2582                 }
2583                 offset += object_set_size;
2584                 length -= object_set_size;
2585         }
2586         while (length) {
2587                 loff_t size = length;
2588                 ret = ceph_zero_partial_object(inode, offset, &size);
2589                 if (ret < 0)
2590                         return ret;
2591                 offset += size;
2592                 length -= size;
2593         }
2594         return ret;
2595 }
2596
2597 static long ceph_fallocate(struct file *file, int mode,
2598                                 loff_t offset, loff_t length)
2599 {
2600         struct ceph_file_info *fi = file->private_data;
2601         struct inode *inode = file_inode(file);
2602         struct ceph_inode_info *ci = ceph_inode(inode);
2603         struct ceph_cap_flush *prealloc_cf;
2604         struct ceph_client *cl = ceph_inode_to_client(inode);
2605         int want, got = 0;
2606         int dirty;
2607         int ret = 0;
2608         loff_t endoff = 0;
2609         loff_t size;
2610
2611         doutc(cl, "%p %llx.%llx mode %x, offset %llu length %llu\n",
2612               inode, ceph_vinop(inode), mode, offset, length);
2613
2614         if (mode != (FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
2615                 return -EOPNOTSUPP;
2616
2617         if (!S_ISREG(inode->i_mode))
2618                 return -EOPNOTSUPP;
2619
2620         if (IS_ENCRYPTED(inode))
2621                 return -EOPNOTSUPP;
2622
2623         prealloc_cf = ceph_alloc_cap_flush();
2624         if (!prealloc_cf)
2625                 return -ENOMEM;
2626
2627         inode_lock(inode);
2628
2629         if (ceph_snap(inode) != CEPH_NOSNAP) {
2630                 ret = -EROFS;
2631                 goto unlock;
2632         }
2633
2634         size = i_size_read(inode);
2635
2636         /* Are we punching a hole beyond EOF? */
2637         if (offset >= size)
2638                 goto unlock;
2639         if ((offset + length) > size)
2640                 length = size - offset;
2641
2642         if (fi->fmode & CEPH_FILE_MODE_LAZY)
2643                 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
2644         else
2645                 want = CEPH_CAP_FILE_BUFFER;
2646
2647         ret = ceph_get_caps(file, CEPH_CAP_FILE_WR, want, endoff, &got);
2648         if (ret < 0)
2649                 goto unlock;
2650
2651         ret = file_modified(file);
2652         if (ret)
2653                 goto put_caps;
2654
2655         filemap_invalidate_lock(inode->i_mapping);
2656         ceph_fscache_invalidate(inode, false);
2657         ceph_zero_pagecache_range(inode, offset, length);
2658         ret = ceph_zero_objects(inode, offset, length);
2659
2660         if (!ret) {
2661                 spin_lock(&ci->i_ceph_lock);
2662                 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
2663                                                &prealloc_cf);
2664                 spin_unlock(&ci->i_ceph_lock);
2665                 if (dirty)
2666                         __mark_inode_dirty(inode, dirty);
2667         }
2668         filemap_invalidate_unlock(inode->i_mapping);
2669
2670 put_caps:
2671         ceph_put_cap_refs(ci, got);
2672 unlock:
2673         inode_unlock(inode);
2674         ceph_free_cap_flush(prealloc_cf);
2675         return ret;
2676 }
2677
2678 /*
2679  * This function tries to get FILE_WR capabilities for dst_ci and FILE_RD for
2680  * src_ci.  Two attempts are made to obtain both caps, and an error is return if
2681  * this fails; zero is returned on success.
2682  */
2683 static int get_rd_wr_caps(struct file *src_filp, int *src_got,
2684                           struct file *dst_filp,
2685                           loff_t dst_endoff, int *dst_got)
2686 {
2687         int ret = 0;
2688         bool retrying = false;
2689
2690 retry_caps:
2691         ret = ceph_get_caps(dst_filp, CEPH_CAP_FILE_WR, CEPH_CAP_FILE_BUFFER,
2692                             dst_endoff, dst_got);
2693         if (ret < 0)
2694                 return ret;
2695
2696         /*
2697          * Since we're already holding the FILE_WR capability for the dst file,
2698          * we would risk a deadlock by using ceph_get_caps.  Thus, we'll do some
2699          * retry dance instead to try to get both capabilities.
2700          */
2701         ret = ceph_try_get_caps(file_inode(src_filp),
2702                                 CEPH_CAP_FILE_RD, CEPH_CAP_FILE_SHARED,
2703                                 false, src_got);
2704         if (ret <= 0) {
2705                 /* Start by dropping dst_ci caps and getting src_ci caps */
2706                 ceph_put_cap_refs(ceph_inode(file_inode(dst_filp)), *dst_got);
2707                 if (retrying) {
2708                         if (!ret)
2709                                 /* ceph_try_get_caps masks EAGAIN */
2710                                 ret = -EAGAIN;
2711                         return ret;
2712                 }
2713                 ret = ceph_get_caps(src_filp, CEPH_CAP_FILE_RD,
2714                                     CEPH_CAP_FILE_SHARED, -1, src_got);
2715                 if (ret < 0)
2716                         return ret;
2717                 /*... drop src_ci caps too, and retry */
2718                 ceph_put_cap_refs(ceph_inode(file_inode(src_filp)), *src_got);
2719                 retrying = true;
2720                 goto retry_caps;
2721         }
2722         return ret;
2723 }
2724
2725 static void put_rd_wr_caps(struct ceph_inode_info *src_ci, int src_got,
2726                            struct ceph_inode_info *dst_ci, int dst_got)
2727 {
2728         ceph_put_cap_refs(src_ci, src_got);
2729         ceph_put_cap_refs(dst_ci, dst_got);
2730 }
2731
2732 /*
2733  * This function does several size-related checks, returning an error if:
2734  *  - source file is smaller than off+len
2735  *  - destination file size is not OK (inode_newsize_ok())
2736  *  - max bytes quotas is exceeded
2737  */
2738 static int is_file_size_ok(struct inode *src_inode, struct inode *dst_inode,
2739                            loff_t src_off, loff_t dst_off, size_t len)
2740 {
2741         struct ceph_client *cl = ceph_inode_to_client(src_inode);
2742         loff_t size, endoff;
2743
2744         size = i_size_read(src_inode);
2745         /*
2746          * Don't copy beyond source file EOF.  Instead of simply setting length
2747          * to (size - src_off), just drop to VFS default implementation, as the
2748          * local i_size may be stale due to other clients writing to the source
2749          * inode.
2750          */
2751         if (src_off + len > size) {
2752                 doutc(cl, "Copy beyond EOF (%llu + %zu > %llu)\n", src_off,
2753                       len, size);
2754                 return -EOPNOTSUPP;
2755         }
2756         size = i_size_read(dst_inode);
2757
2758         endoff = dst_off + len;
2759         if (inode_newsize_ok(dst_inode, endoff))
2760                 return -EOPNOTSUPP;
2761
2762         if (ceph_quota_is_max_bytes_exceeded(dst_inode, endoff))
2763                 return -EDQUOT;
2764
2765         return 0;
2766 }
2767
2768 static struct ceph_osd_request *
2769 ceph_alloc_copyfrom_request(struct ceph_osd_client *osdc,
2770                             u64 src_snapid,
2771                             struct ceph_object_id *src_oid,
2772                             struct ceph_object_locator *src_oloc,
2773                             struct ceph_object_id *dst_oid,
2774                             struct ceph_object_locator *dst_oloc,
2775                             u32 truncate_seq, u64 truncate_size)
2776 {
2777         struct ceph_osd_request *req;
2778         int ret;
2779         u32 src_fadvise_flags =
2780                 CEPH_OSD_OP_FLAG_FADVISE_SEQUENTIAL |
2781                 CEPH_OSD_OP_FLAG_FADVISE_NOCACHE;
2782         u32 dst_fadvise_flags =
2783                 CEPH_OSD_OP_FLAG_FADVISE_SEQUENTIAL |
2784                 CEPH_OSD_OP_FLAG_FADVISE_DONTNEED;
2785
2786         req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_KERNEL);
2787         if (!req)
2788                 return ERR_PTR(-ENOMEM);
2789
2790         req->r_flags = CEPH_OSD_FLAG_WRITE;
2791
2792         ceph_oloc_copy(&req->r_t.base_oloc, dst_oloc);
2793         ceph_oid_copy(&req->r_t.base_oid, dst_oid);
2794
2795         ret = osd_req_op_copy_from_init(req, src_snapid, 0,
2796                                         src_oid, src_oloc,
2797                                         src_fadvise_flags,
2798                                         dst_fadvise_flags,
2799                                         truncate_seq,
2800                                         truncate_size,
2801                                         CEPH_OSD_COPY_FROM_FLAG_TRUNCATE_SEQ);
2802         if (ret)
2803                 goto out;
2804
2805         ret = ceph_osdc_alloc_messages(req, GFP_KERNEL);
2806         if (ret)
2807                 goto out;
2808
2809         return req;
2810
2811 out:
2812         ceph_osdc_put_request(req);
2813         return ERR_PTR(ret);
2814 }
2815
2816 static ssize_t ceph_do_objects_copy(struct ceph_inode_info *src_ci, u64 *src_off,
2817                                     struct ceph_inode_info *dst_ci, u64 *dst_off,
2818                                     struct ceph_fs_client *fsc,
2819                                     size_t len, unsigned int flags)
2820 {
2821         struct ceph_object_locator src_oloc, dst_oloc;
2822         struct ceph_object_id src_oid, dst_oid;
2823         struct ceph_osd_client *osdc;
2824         struct ceph_osd_request *req;
2825         size_t bytes = 0;
2826         u64 src_objnum, src_objoff, dst_objnum, dst_objoff;
2827         u32 src_objlen, dst_objlen;
2828         u32 object_size = src_ci->i_layout.object_size;
2829         struct ceph_client *cl = fsc->client;
2830         int ret;
2831
2832         src_oloc.pool = src_ci->i_layout.pool_id;
2833         src_oloc.pool_ns = ceph_try_get_string(src_ci->i_layout.pool_ns);
2834         dst_oloc.pool = dst_ci->i_layout.pool_id;
2835         dst_oloc.pool_ns = ceph_try_get_string(dst_ci->i_layout.pool_ns);
2836         osdc = &fsc->client->osdc;
2837
2838         while (len >= object_size) {
2839                 ceph_calc_file_object_mapping(&src_ci->i_layout, *src_off,
2840                                               object_size, &src_objnum,
2841                                               &src_objoff, &src_objlen);
2842                 ceph_calc_file_object_mapping(&dst_ci->i_layout, *dst_off,
2843                                               object_size, &dst_objnum,
2844                                               &dst_objoff, &dst_objlen);
2845                 ceph_oid_init(&src_oid);
2846                 ceph_oid_printf(&src_oid, "%llx.%08llx",
2847                                 src_ci->i_vino.ino, src_objnum);
2848                 ceph_oid_init(&dst_oid);
2849                 ceph_oid_printf(&dst_oid, "%llx.%08llx",
2850                                 dst_ci->i_vino.ino, dst_objnum);
2851                 /* Do an object remote copy */
2852                 req = ceph_alloc_copyfrom_request(osdc, src_ci->i_vino.snap,
2853                                                   &src_oid, &src_oloc,
2854                                                   &dst_oid, &dst_oloc,
2855                                                   dst_ci->i_truncate_seq,
2856                                                   dst_ci->i_truncate_size);
2857                 if (IS_ERR(req))
2858                         ret = PTR_ERR(req);
2859                 else {
2860                         ceph_osdc_start_request(osdc, req);
2861                         ret = ceph_osdc_wait_request(osdc, req);
2862                         ceph_update_copyfrom_metrics(&fsc->mdsc->metric,
2863                                                      req->r_start_latency,
2864                                                      req->r_end_latency,
2865                                                      object_size, ret);
2866                         ceph_osdc_put_request(req);
2867                 }
2868                 if (ret) {
2869                         if (ret == -EOPNOTSUPP) {
2870                                 fsc->have_copy_from2 = false;
2871                                 pr_notice_client(cl,
2872                                         "OSDs don't support copy-from2; disabling copy offload\n");
2873                         }
2874                         doutc(cl, "returned %d\n", ret);
2875                         if (!bytes)
2876                                 bytes = ret;
2877                         goto out;
2878                 }
2879                 len -= object_size;
2880                 bytes += object_size;
2881                 *src_off += object_size;
2882                 *dst_off += object_size;
2883         }
2884
2885 out:
2886         ceph_oloc_destroy(&src_oloc);
2887         ceph_oloc_destroy(&dst_oloc);
2888         return bytes;
2889 }
2890
2891 static ssize_t __ceph_copy_file_range(struct file *src_file, loff_t src_off,
2892                                       struct file *dst_file, loff_t dst_off,
2893                                       size_t len, unsigned int flags)
2894 {
2895         struct inode *src_inode = file_inode(src_file);
2896         struct inode *dst_inode = file_inode(dst_file);
2897         struct ceph_inode_info *src_ci = ceph_inode(src_inode);
2898         struct ceph_inode_info *dst_ci = ceph_inode(dst_inode);
2899         struct ceph_cap_flush *prealloc_cf;
2900         struct ceph_fs_client *src_fsc = ceph_inode_to_fs_client(src_inode);
2901         struct ceph_client *cl = src_fsc->client;
2902         loff_t size;
2903         ssize_t ret = -EIO, bytes;
2904         u64 src_objnum, dst_objnum, src_objoff, dst_objoff;
2905         u32 src_objlen, dst_objlen;
2906         int src_got = 0, dst_got = 0, err, dirty;
2907
2908         if (src_inode->i_sb != dst_inode->i_sb) {
2909                 struct ceph_fs_client *dst_fsc = ceph_inode_to_fs_client(dst_inode);
2910
2911                 if (ceph_fsid_compare(&src_fsc->client->fsid,
2912                                       &dst_fsc->client->fsid)) {
2913                         dout("Copying files across clusters: src: %pU dst: %pU\n",
2914                              &src_fsc->client->fsid, &dst_fsc->client->fsid);
2915                         return -EXDEV;
2916                 }
2917         }
2918         if (ceph_snap(dst_inode) != CEPH_NOSNAP)
2919                 return -EROFS;
2920
2921         /*
2922          * Some of the checks below will return -EOPNOTSUPP, which will force a
2923          * fallback to the default VFS copy_file_range implementation.  This is
2924          * desirable in several cases (for ex, the 'len' is smaller than the
2925          * size of the objects, or in cases where that would be more
2926          * efficient).
2927          */
2928
2929         if (ceph_test_mount_opt(src_fsc, NOCOPYFROM))
2930                 return -EOPNOTSUPP;
2931
2932         if (!src_fsc->have_copy_from2)
2933                 return -EOPNOTSUPP;
2934
2935         /*
2936          * Striped file layouts require that we copy partial objects, but the
2937          * OSD copy-from operation only supports full-object copies.  Limit
2938          * this to non-striped file layouts for now.
2939          */
2940         if ((src_ci->i_layout.stripe_unit != dst_ci->i_layout.stripe_unit) ||
2941             (src_ci->i_layout.stripe_count != 1) ||
2942             (dst_ci->i_layout.stripe_count != 1) ||
2943             (src_ci->i_layout.object_size != dst_ci->i_layout.object_size)) {
2944                 doutc(cl, "Invalid src/dst files layout\n");
2945                 return -EOPNOTSUPP;
2946         }
2947
2948         /* Every encrypted inode gets its own key, so we can't offload them */
2949         if (IS_ENCRYPTED(src_inode) || IS_ENCRYPTED(dst_inode))
2950                 return -EOPNOTSUPP;
2951
2952         if (len < src_ci->i_layout.object_size)
2953                 return -EOPNOTSUPP; /* no remote copy will be done */
2954
2955         prealloc_cf = ceph_alloc_cap_flush();
2956         if (!prealloc_cf)
2957                 return -ENOMEM;
2958
2959         /* Start by sync'ing the source and destination files */
2960         ret = file_write_and_wait_range(src_file, src_off, (src_off + len));
2961         if (ret < 0) {
2962                 doutc(cl, "failed to write src file (%zd)\n", ret);
2963                 goto out;
2964         }
2965         ret = file_write_and_wait_range(dst_file, dst_off, (dst_off + len));
2966         if (ret < 0) {
2967                 doutc(cl, "failed to write dst file (%zd)\n", ret);
2968                 goto out;
2969         }
2970
2971         /*
2972          * We need FILE_WR caps for dst_ci and FILE_RD for src_ci as other
2973          * clients may have dirty data in their caches.  And OSDs know nothing
2974          * about caps, so they can't safely do the remote object copies.
2975          */
2976         err = get_rd_wr_caps(src_file, &src_got,
2977                              dst_file, (dst_off + len), &dst_got);
2978         if (err < 0) {
2979                 doutc(cl, "get_rd_wr_caps returned %d\n", err);
2980                 ret = -EOPNOTSUPP;
2981                 goto out;
2982         }
2983
2984         ret = is_file_size_ok(src_inode, dst_inode, src_off, dst_off, len);
2985         if (ret < 0)
2986                 goto out_caps;
2987
2988         /* Drop dst file cached pages */
2989         ceph_fscache_invalidate(dst_inode, false);
2990         ret = invalidate_inode_pages2_range(dst_inode->i_mapping,
2991                                             dst_off >> PAGE_SHIFT,
2992                                             (dst_off + len) >> PAGE_SHIFT);
2993         if (ret < 0) {
2994                 doutc(cl, "Failed to invalidate inode pages (%zd)\n",
2995                             ret);
2996                 ret = 0; /* XXX */
2997         }
2998         ceph_calc_file_object_mapping(&src_ci->i_layout, src_off,
2999                                       src_ci->i_layout.object_size,
3000                                       &src_objnum, &src_objoff, &src_objlen);
3001         ceph_calc_file_object_mapping(&dst_ci->i_layout, dst_off,
3002                                       dst_ci->i_layout.object_size,
3003                                       &dst_objnum, &dst_objoff, &dst_objlen);
3004         /* object-level offsets need to the same */
3005         if (src_objoff != dst_objoff) {
3006                 ret = -EOPNOTSUPP;
3007                 goto out_caps;
3008         }
3009
3010         /*
3011          * Do a manual copy if the object offset isn't object aligned.
3012          * 'src_objlen' contains the bytes left until the end of the object,
3013          * starting at the src_off
3014          */
3015         if (src_objoff) {
3016                 doutc(cl, "Initial partial copy of %u bytes\n", src_objlen);
3017
3018                 /*
3019                  * we need to temporarily drop all caps as we'll be calling
3020                  * {read,write}_iter, which will get caps again.
3021                  */
3022                 put_rd_wr_caps(src_ci, src_got, dst_ci, dst_got);
3023                 ret = splice_file_range(src_file, &src_off, dst_file, &dst_off,
3024                                         src_objlen);
3025                 /* Abort on short copies or on error */
3026                 if (ret < (long)src_objlen) {
3027                         doutc(cl, "Failed partial copy (%zd)\n", ret);
3028                         goto out;
3029                 }
3030                 len -= ret;
3031                 err = get_rd_wr_caps(src_file, &src_got,
3032                                      dst_file, (dst_off + len), &dst_got);
3033                 if (err < 0)
3034                         goto out;
3035                 err = is_file_size_ok(src_inode, dst_inode,
3036                                       src_off, dst_off, len);
3037                 if (err < 0)
3038                         goto out_caps;
3039         }
3040
3041         size = i_size_read(dst_inode);
3042         bytes = ceph_do_objects_copy(src_ci, &src_off, dst_ci, &dst_off,
3043                                      src_fsc, len, flags);
3044         if (bytes <= 0) {
3045                 if (!ret)
3046                         ret = bytes;
3047                 goto out_caps;
3048         }
3049         doutc(cl, "Copied %zu bytes out of %zu\n", bytes, len);
3050         len -= bytes;
3051         ret += bytes;
3052
3053         file_update_time(dst_file);
3054         inode_inc_iversion_raw(dst_inode);
3055
3056         if (dst_off > size) {
3057                 /* Let the MDS know about dst file size change */
3058                 if (ceph_inode_set_size(dst_inode, dst_off) ||
3059                     ceph_quota_is_max_bytes_approaching(dst_inode, dst_off))
3060                         ceph_check_caps(dst_ci, CHECK_CAPS_AUTHONLY | CHECK_CAPS_FLUSH);
3061         }
3062         /* Mark Fw dirty */
3063         spin_lock(&dst_ci->i_ceph_lock);
3064         dirty = __ceph_mark_dirty_caps(dst_ci, CEPH_CAP_FILE_WR, &prealloc_cf);
3065         spin_unlock(&dst_ci->i_ceph_lock);
3066         if (dirty)
3067                 __mark_inode_dirty(dst_inode, dirty);
3068
3069 out_caps:
3070         put_rd_wr_caps(src_ci, src_got, dst_ci, dst_got);
3071
3072         /*
3073          * Do the final manual copy if we still have some bytes left, unless
3074          * there were errors in remote object copies (len >= object_size).
3075          */
3076         if (len && (len < src_ci->i_layout.object_size)) {
3077                 doutc(cl, "Final partial copy of %zu bytes\n", len);
3078                 bytes = splice_file_range(src_file, &src_off, dst_file,
3079                                           &dst_off, len);
3080                 if (bytes > 0)
3081                         ret += bytes;
3082                 else
3083                         doutc(cl, "Failed partial copy (%zd)\n", bytes);
3084         }
3085
3086 out:
3087         ceph_free_cap_flush(prealloc_cf);
3088
3089         return ret;
3090 }
3091
3092 static ssize_t ceph_copy_file_range(struct file *src_file, loff_t src_off,
3093                                     struct file *dst_file, loff_t dst_off,
3094                                     size_t len, unsigned int flags)
3095 {
3096         ssize_t ret;
3097
3098         ret = __ceph_copy_file_range(src_file, src_off, dst_file, dst_off,
3099                                      len, flags);
3100
3101         if (ret == -EOPNOTSUPP || ret == -EXDEV)
3102                 ret = splice_copy_file_range(src_file, src_off, dst_file,
3103                                              dst_off, len);
3104         return ret;
3105 }
3106
3107 const struct file_operations ceph_file_fops = {
3108         .open = ceph_open,
3109         .release = ceph_release,
3110         .llseek = ceph_llseek,
3111         .read_iter = ceph_read_iter,
3112         .write_iter = ceph_write_iter,
3113         .mmap = ceph_mmap,
3114         .fsync = ceph_fsync,
3115         .lock = ceph_lock,
3116         .setlease = simple_nosetlease,
3117         .flock = ceph_flock,
3118         .splice_read = ceph_splice_read,
3119         .splice_write = iter_file_splice_write,
3120         .unlocked_ioctl = ceph_ioctl,
3121         .compat_ioctl = compat_ptr_ioctl,
3122         .fallocate      = ceph_fallocate,
3123         .copy_file_range = ceph_copy_file_range,
3124 };