fs/ceph/file.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/ceph/ceph_debug.h>
   3 #include <linux/ceph/striper.h>
   4
   5 #include <linux/module.h>
   6 #include <linux/sched.h>
   7 #include <linux/slab.h>
   8 #include <linux/file.h>
   9 #include <linux/mount.h>
  10 #include <linux/namei.h>
  11 #include <linux/writeback.h>
  12 #include <linux/falloc.h>
  13 #include <linux/iversion.h>
  14 #include <linux/ktime.h>
  15 #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                 left = ret > 0 ? ret : 0;
1142                 while (left > 0) {
1143                         size_t plen, copied;
1144
1145                         plen = min_t(size_t, left, PAGE_SIZE - page_off);
1146                         SetPageUptodate(pages[idx]);
1147                         copied = copy_page_to_iter(pages[idx++],
1148                                                    page_off, plen, to);
1149                         off += copied;
1150                         left -= copied;
1151                         page_off = 0;
1152                         if (copied < plen) {
1153                                 ret = -EFAULT;
1154                                 break;
1155                         }
1156                 }
1157                 ceph_release_page_vector(pages, num_pages);
1158
1159                 if (ret < 0) {
1160                         if (ret == -EBLOCKLISTED)
1161                                 fsc->blocklisted = true;
1162                         break;
1163                 }
1164
1165                 if (off >= i_size || !more)
1166                         break;
1167         }
1168
1169         if (ret > 0) {
1170                 if (off > *ki_pos) {
1171                         if (off >= i_size) {
1172                                 *retry_op = CHECK_EOF;
1173                                 ret = i_size - *ki_pos;
1174                                 *ki_pos = i_size;
1175                         } else {
1176                                 ret = off - *ki_pos;
1177                                 *ki_pos = off;
1178                         }
1179                 }
1180
1181                 if (last_objver)
1182                         *last_objver = objver;
1183         }
1184         doutc(cl, "result %zd retry_op %d\n", ret, *retry_op);
1185         return ret;
1186 }
1187
1188 static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *to,
1189                               int *retry_op)
1190 {
1191         struct file *file = iocb->ki_filp;
1192         struct inode *inode = file_inode(file);
1193         struct ceph_client *cl = ceph_inode_to_client(inode);
1194
1195         doutc(cl, "on file %p %llx~%zx %s\n", file, iocb->ki_pos,
1196               iov_iter_count(to),
1197               (file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
1198
1199         return __ceph_sync_read(inode, &iocb->ki_pos, to, retry_op, NULL);
1200 }
1201
1202 struct ceph_aio_request {
1203         struct kiocb *iocb;
1204         size_t total_len;
1205         bool write;
1206         bool should_dirty;
1207         int error;
1208         struct list_head osd_reqs;
1209         unsigned num_reqs;
1210         atomic_t pending_reqs;
1211         struct timespec64 mtime;
1212         struct ceph_cap_flush *prealloc_cf;
1213 };
1214
1215 struct ceph_aio_work {
1216         struct work_struct work;
1217         struct ceph_osd_request *req;
1218 };
1219
1220 static void ceph_aio_retry_work(struct work_struct *work);
1221
1222 static void ceph_aio_complete(struct inode *inode,
1223                               struct ceph_aio_request *aio_req)
1224 {
1225         struct ceph_client *cl = ceph_inode_to_client(inode);
1226         struct ceph_inode_info *ci = ceph_inode(inode);
1227         int ret;
1228
1229         if (!atomic_dec_and_test(&aio_req->pending_reqs))
1230                 return;
1231
1232         if (aio_req->iocb->ki_flags & IOCB_DIRECT)
1233                 inode_dio_end(inode);
1234
1235         ret = aio_req->error;
1236         if (!ret)
1237                 ret = aio_req->total_len;
1238
1239         doutc(cl, "%p %llx.%llx rc %d\n", inode, ceph_vinop(inode), ret);
1240
1241         if (ret >= 0 && aio_req->write) {
1242                 int dirty;
1243
1244                 loff_t endoff = aio_req->iocb->ki_pos + aio_req->total_len;
1245                 if (endoff > i_size_read(inode)) {
1246                         if (ceph_inode_set_size(inode, endoff))
1247                                 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY);
1248                 }
1249
1250                 spin_lock(&ci->i_ceph_lock);
1251                 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1252                                                &aio_req->prealloc_cf);
1253                 spin_unlock(&ci->i_ceph_lock);
1254                 if (dirty)
1255                         __mark_inode_dirty(inode, dirty);
1256
1257         }
1258
1259         ceph_put_cap_refs(ci, (aio_req->write ? CEPH_CAP_FILE_WR :
1260                                                 CEPH_CAP_FILE_RD));
1261
1262         aio_req->iocb->ki_complete(aio_req->iocb, ret);
1263
1264         ceph_free_cap_flush(aio_req->prealloc_cf);
1265         kfree(aio_req);
1266 }
1267
1268 static void ceph_aio_complete_req(struct ceph_osd_request *req)
1269 {
1270         int rc = req->r_result;
1271         struct inode *inode = req->r_inode;
1272         struct ceph_aio_request *aio_req = req->r_priv;
1273         struct ceph_osd_data *osd_data = osd_req_op_extent_osd_data(req, 0);
1274         struct ceph_osd_req_op *op = &req->r_ops[0];
1275         struct ceph_client_metric *metric = &ceph_sb_to_mdsc(inode->i_sb)->metric;
1276         unsigned int len = osd_data->bvec_pos.iter.bi_size;
1277         bool sparse = (op->op == CEPH_OSD_OP_SPARSE_READ);
1278         struct ceph_client *cl = ceph_inode_to_client(inode);
1279
1280         BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_BVECS);
1281         BUG_ON(!osd_data->num_bvecs);
1282
1283         doutc(cl, "req %p inode %p %llx.%llx, rc %d bytes %u\n", req,
1284               inode, ceph_vinop(inode), rc, len);
1285
1286         if (rc == -EOLDSNAPC) {
1287                 struct ceph_aio_work *aio_work;
1288                 BUG_ON(!aio_req->write);
1289
1290                 aio_work = kmalloc(sizeof(*aio_work), GFP_NOFS);
1291                 if (aio_work) {
1292                         INIT_WORK(&aio_work->work, ceph_aio_retry_work);
1293                         aio_work->req = req;
1294                         queue_work(ceph_inode_to_fs_client(inode)->inode_wq,
1295                                    &aio_work->work);
1296                         return;
1297                 }
1298                 rc = -ENOMEM;
1299         } else if (!aio_req->write) {
1300                 if (sparse && rc >= 0)
1301                         rc = ceph_sparse_ext_map_end(op);
1302                 if (rc == -ENOENT)
1303                         rc = 0;
1304                 if (rc >= 0 && len > rc) {
1305                         struct iov_iter i;
1306                         int zlen = len - rc;
1307
1308                         /*
1309                          * If read is satisfied by single OSD request,
1310                          * it can pass EOF. Otherwise read is within
1311                          * i_size.
1312                          */
1313                         if (aio_req->num_reqs == 1) {
1314                                 loff_t i_size = i_size_read(inode);
1315                                 loff_t endoff = aio_req->iocb->ki_pos + rc;
1316                                 if (endoff < i_size)
1317                                         zlen = min_t(size_t, zlen,
1318                                                      i_size - endoff);
1319                                 aio_req->total_len = rc + zlen;
1320                         }
1321
1322                         iov_iter_bvec(&i, ITER_DEST, osd_data->bvec_pos.bvecs,
1323                                       osd_data->num_bvecs, len);
1324                         iov_iter_advance(&i, rc);
1325                         iov_iter_zero(zlen, &i);
1326                 }
1327         }
1328
1329         /* r_start_latency == 0 means the request was not submitted */
1330         if (req->r_start_latency) {
1331                 if (aio_req->write)
1332                         ceph_update_write_metrics(metric, req->r_start_latency,
1333                                                   req->r_end_latency, len, rc);
1334                 else
1335                         ceph_update_read_metrics(metric, req->r_start_latency,
1336                                                  req->r_end_latency, len, rc);
1337         }
1338
1339         put_bvecs(osd_data->bvec_pos.bvecs, osd_data->num_bvecs,
1340                   aio_req->should_dirty);
1341         ceph_osdc_put_request(req);
1342
1343         if (rc < 0)
1344                 cmpxchg(&aio_req->error, 0, rc);
1345
1346         ceph_aio_complete(inode, aio_req);
1347         return;
1348 }
1349
1350 static void ceph_aio_retry_work(struct work_struct *work)
1351 {
1352         struct ceph_aio_work *aio_work =
1353                 container_of(work, struct ceph_aio_work, work);
1354         struct ceph_osd_request *orig_req = aio_work->req;
1355         struct ceph_aio_request *aio_req = orig_req->r_priv;
1356         struct inode *inode = orig_req->r_inode;
1357         struct ceph_inode_info *ci = ceph_inode(inode);
1358         struct ceph_snap_context *snapc;
1359         struct ceph_osd_request *req;
1360         int ret;
1361
1362         spin_lock(&ci->i_ceph_lock);
1363         if (__ceph_have_pending_cap_snap(ci)) {
1364                 struct ceph_cap_snap *capsnap =
1365                         list_last_entry(&ci->i_cap_snaps,
1366                                         struct ceph_cap_snap,
1367                                         ci_item);
1368                 snapc = ceph_get_snap_context(capsnap->context);
1369         } else {
1370                 BUG_ON(!ci->i_head_snapc);
1371                 snapc = ceph_get_snap_context(ci->i_head_snapc);
1372         }
1373         spin_unlock(&ci->i_ceph_lock);
1374
1375         req = ceph_osdc_alloc_request(orig_req->r_osdc, snapc, 1,
1376                         false, GFP_NOFS);
1377         if (!req) {
1378                 ret = -ENOMEM;
1379                 req = orig_req;
1380                 goto out;
1381         }
1382
1383         req->r_flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE;
1384         ceph_oloc_copy(&req->r_base_oloc, &orig_req->r_base_oloc);
1385         ceph_oid_copy(&req->r_base_oid, &orig_req->r_base_oid);
1386
1387         req->r_ops[0] = orig_req->r_ops[0];
1388
1389         req->r_mtime = aio_req->mtime;
1390         req->r_data_offset = req->r_ops[0].extent.offset;
1391
1392         ret = ceph_osdc_alloc_messages(req, GFP_NOFS);
1393         if (ret) {
1394                 ceph_osdc_put_request(req);
1395                 req = orig_req;
1396                 goto out;
1397         }
1398
1399         ceph_osdc_put_request(orig_req);
1400
1401         req->r_callback = ceph_aio_complete_req;
1402         req->r_inode = inode;
1403         req->r_priv = aio_req;
1404
1405         ceph_osdc_start_request(req->r_osdc, req);
1406 out:
1407         if (ret < 0) {
1408                 req->r_result = ret;
1409                 ceph_aio_complete_req(req);
1410         }
1411
1412         ceph_put_snap_context(snapc);
1413         kfree(aio_work);
1414 }
1415
1416 static ssize_t
1417 ceph_direct_read_write(struct kiocb *iocb, struct iov_iter *iter,
1418                        struct ceph_snap_context *snapc,
1419                        struct ceph_cap_flush **pcf)
1420 {
1421         struct file *file = iocb->ki_filp;
1422         struct inode *inode = file_inode(file);
1423         struct ceph_inode_info *ci = ceph_inode(inode);
1424         struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
1425         struct ceph_client *cl = fsc->client;
1426         struct ceph_client_metric *metric = &fsc->mdsc->metric;
1427         struct ceph_vino vino;
1428         struct ceph_osd_request *req;
1429         struct bio_vec *bvecs;
1430         struct ceph_aio_request *aio_req = NULL;
1431         int num_pages = 0;
1432         int flags;
1433         int ret = 0;
1434         struct timespec64 mtime = current_time(inode);
1435         size_t count = iov_iter_count(iter);
1436         loff_t pos = iocb->ki_pos;
1437         bool write = iov_iter_rw(iter) == WRITE;
1438         bool should_dirty = !write && user_backed_iter(iter);
1439         bool sparse = ceph_test_mount_opt(fsc, SPARSEREAD);
1440
1441         if (write && ceph_snap(file_inode(file)) != CEPH_NOSNAP)
1442                 return -EROFS;
1443
1444         doutc(cl, "sync_direct_%s on file %p %lld~%u snapc %p seq %lld\n",
1445               (write ? "write" : "read"), file, pos, (unsigned)count,
1446               snapc, snapc ? snapc->seq : 0);
1447
1448         if (write) {
1449                 int ret2;
1450
1451                 ceph_fscache_invalidate(inode, true);
1452
1453                 ret2 = invalidate_inode_pages2_range(inode->i_mapping,
1454                                         pos >> PAGE_SHIFT,
1455                                         (pos + count - 1) >> PAGE_SHIFT);
1456                 if (ret2 < 0)
1457                         doutc(cl, "invalidate_inode_pages2_range returned %d\n",
1458                               ret2);
1459
1460                 flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE;
1461         } else {
1462                 flags = CEPH_OSD_FLAG_READ;
1463         }
1464
1465         while (iov_iter_count(iter) > 0) {
1466                 u64 size = iov_iter_count(iter);
1467                 ssize_t len;
1468                 struct ceph_osd_req_op *op;
1469                 int readop = sparse ? CEPH_OSD_OP_SPARSE_READ : CEPH_OSD_OP_READ;
1470                 int extent_cnt;
1471
1472                 if (write)
1473                         size = min_t(u64, size, fsc->mount_options->wsize);
1474                 else
1475                         size = min_t(u64, size, fsc->mount_options->rsize);
1476
1477                 vino = ceph_vino(inode);
1478                 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1479                                             vino, pos, &size, 0,
1480                                             1,
1481                                             write ? CEPH_OSD_OP_WRITE : readop,
1482                                             flags, snapc,
1483                                             ci->i_truncate_seq,
1484                                             ci->i_truncate_size,
1485                                             false);
1486                 if (IS_ERR(req)) {
1487                         ret = PTR_ERR(req);
1488                         break;
1489                 }
1490
1491                 len = iter_get_bvecs_alloc(iter, size, &bvecs, &num_pages);
1492                 if (len < 0) {
1493                         ceph_osdc_put_request(req);
1494                         ret = len;
1495                         break;
1496                 }
1497                 if (len != size)
1498                         osd_req_op_extent_update(req, 0, len);
1499
1500                 /*
1501                  * To simplify error handling, allow AIO when IO within i_size
1502                  * or IO can be satisfied by single OSD request.
1503                  */
1504                 if (pos == iocb->ki_pos && !is_sync_kiocb(iocb) &&
1505                     (len == count || pos + count <= i_size_read(inode))) {
1506                         aio_req = kzalloc(sizeof(*aio_req), GFP_KERNEL);
1507                         if (aio_req) {
1508                                 aio_req->iocb = iocb;
1509                                 aio_req->write = write;
1510                                 aio_req->should_dirty = should_dirty;
1511                                 INIT_LIST_HEAD(&aio_req->osd_reqs);
1512                                 if (write) {
1513                                         aio_req->mtime = mtime;
1514                                         swap(aio_req->prealloc_cf, *pcf);
1515                                 }
1516                         }
1517                         /* ignore error */
1518                 }
1519
1520                 if (write) {
1521                         /*
1522                          * throw out any page cache pages in this range. this
1523                          * may block.
1524                          */
1525                         truncate_inode_pages_range(inode->i_mapping, pos,
1526                                                    PAGE_ALIGN(pos + len) - 1);
1527
1528                         req->r_mtime = mtime;
1529                 }
1530
1531                 osd_req_op_extent_osd_data_bvecs(req, 0, bvecs, num_pages, len);
1532                 op = &req->r_ops[0];
1533                 if (sparse) {
1534                         extent_cnt = __ceph_sparse_read_ext_count(inode, size);
1535                         ret = ceph_alloc_sparse_ext_map(op, extent_cnt);
1536                         if (ret) {
1537                                 ceph_osdc_put_request(req);
1538                                 break;
1539                         }
1540                 }
1541
1542                 if (aio_req) {
1543                         aio_req->total_len += len;
1544                         aio_req->num_reqs++;
1545                         atomic_inc(&aio_req->pending_reqs);
1546
1547                         req->r_callback = ceph_aio_complete_req;
1548                         req->r_inode = inode;
1549                         req->r_priv = aio_req;
1550                         list_add_tail(&req->r_private_item, &aio_req->osd_reqs);
1551
1552                         pos += len;
1553                         continue;
1554                 }
1555
1556                 ceph_osdc_start_request(req->r_osdc, req);
1557                 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1558
1559                 if (write)
1560                         ceph_update_write_metrics(metric, req->r_start_latency,
1561                                                   req->r_end_latency, len, ret);
1562                 else
1563                         ceph_update_read_metrics(metric, req->r_start_latency,
1564                                                  req->r_end_latency, len, ret);
1565
1566                 size = i_size_read(inode);
1567                 if (!write) {
1568                         if (sparse && ret >= 0)
1569                                 ret = ceph_sparse_ext_map_end(op);
1570                         else if (ret == -ENOENT)
1571                                 ret = 0;
1572
1573                         if (ret >= 0 && ret < len && pos + ret < size) {
1574                                 struct iov_iter i;
1575                                 int zlen = min_t(size_t, len - ret,
1576                                                  size - pos - ret);
1577
1578                                 iov_iter_bvec(&i, ITER_DEST, bvecs, num_pages, len);
1579                                 iov_iter_advance(&i, ret);
1580                                 iov_iter_zero(zlen, &i);
1581                                 ret += zlen;
1582                         }
1583                         if (ret >= 0)
1584                                 len = ret;
1585                 }
1586
1587                 put_bvecs(bvecs, num_pages, should_dirty);
1588                 ceph_osdc_put_request(req);
1589                 if (ret < 0)
1590                         break;
1591
1592                 pos += len;
1593                 if (!write && pos >= size)
1594                         break;
1595
1596                 if (write && pos > size) {
1597                         if (ceph_inode_set_size(inode, pos))
1598                                 ceph_check_caps(ceph_inode(inode),
1599                                                 CHECK_CAPS_AUTHONLY);
1600                 }
1601         }
1602
1603         if (aio_req) {
1604                 LIST_HEAD(osd_reqs);
1605
1606                 if (aio_req->num_reqs == 0) {
1607                         kfree(aio_req);
1608                         return ret;
1609                 }
1610
1611                 ceph_get_cap_refs(ci, write ? CEPH_CAP_FILE_WR :
1612                                               CEPH_CAP_FILE_RD);
1613
1614                 list_splice(&aio_req->osd_reqs, &osd_reqs);
1615                 inode_dio_begin(inode);
1616                 while (!list_empty(&osd_reqs)) {
1617                         req = list_first_entry(&osd_reqs,
1618                                                struct ceph_osd_request,
1619                                                r_private_item);
1620                         list_del_init(&req->r_private_item);
1621                         if (ret >= 0)
1622                                 ceph_osdc_start_request(req->r_osdc, req);
1623                         if (ret < 0) {
1624                                 req->r_result = ret;
1625                                 ceph_aio_complete_req(req);
1626                         }
1627                 }
1628                 return -EIOCBQUEUED;
1629         }
1630
1631         if (ret != -EOLDSNAPC && pos > iocb->ki_pos) {
1632                 ret = pos - iocb->ki_pos;
1633                 iocb->ki_pos = pos;
1634         }
1635         return ret;
1636 }
1637
1638 /*
1639  * Synchronous write, straight from __user pointer or user pages.
1640  *
1641  * If write spans object boundary, just do multiple writes.  (For a
1642  * correct atomic write, we should e.g. take write locks on all
1643  * objects, rollback on failure, etc.)
1644  */
1645 static ssize_t
1646 ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos,
1647                 struct ceph_snap_context *snapc)
1648 {
1649         struct file *file = iocb->ki_filp;
1650         struct inode *inode = file_inode(file);
1651         struct ceph_inode_info *ci = ceph_inode(inode);
1652         struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
1653         struct ceph_client *cl = fsc->client;
1654         struct ceph_osd_client *osdc = &fsc->client->osdc;
1655         struct ceph_osd_request *req;
1656         struct page **pages;
1657         u64 len;
1658         int num_pages;
1659         int written = 0;
1660         int ret;
1661         bool check_caps = false;
1662         struct timespec64 mtime = current_time(inode);
1663         size_t count = iov_iter_count(from);
1664
1665         if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
1666                 return -EROFS;
1667
1668         doutc(cl, "on file %p %lld~%u snapc %p seq %lld\n", file, pos,
1669               (unsigned)count, snapc, snapc->seq);
1670
1671         ret = filemap_write_and_wait_range(inode->i_mapping,
1672                                            pos, pos + count - 1);
1673         if (ret < 0)
1674                 return ret;
1675
1676         ceph_fscache_invalidate(inode, false);
1677
1678         while ((len = iov_iter_count(from)) > 0) {
1679                 size_t left;
1680                 int n;
1681                 u64 write_pos = pos;
1682                 u64 write_len = len;
1683                 u64 objnum, objoff;
1684                 u32 xlen;
1685                 u64 assert_ver = 0;
1686                 bool rmw;
1687                 bool first, last;
1688                 struct iov_iter saved_iter = *from;
1689                 size_t off;
1690
1691                 ceph_fscrypt_adjust_off_and_len(inode, &write_pos, &write_len);
1692
1693                 /* clamp the length to the end of first object */
1694                 ceph_calc_file_object_mapping(&ci->i_layout, write_pos,
1695                                               write_len, &objnum, &objoff,
1696                                               &xlen);
1697                 write_len = xlen;
1698
1699                 /* adjust len downward if it goes beyond current object */
1700                 if (pos + len > write_pos + write_len)
1701                         len = write_pos + write_len - pos;
1702
1703                 /*
1704                  * If we had to adjust the length or position to align with a
1705                  * crypto block, then we must do a read/modify/write cycle. We
1706                  * use a version assertion to redrive the thing if something
1707                  * changes in between.
1708                  */
1709                 first = pos != write_pos;
1710                 last = (pos + len) != (write_pos + write_len);
1711                 rmw = first || last;
1712
1713                 doutc(cl, "ino %llx %lld~%llu adjusted %lld~%llu -- %srmw\n",
1714                       ci->i_vino.ino, pos, len, write_pos, write_len,
1715                       rmw ? "" : "no ");
1716
1717                 /*
1718                  * The data is emplaced into the page as it would be if it were
1719                  * in an array of pagecache pages.
1720                  */
1721                 num_pages = calc_pages_for(write_pos, write_len);
1722                 pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
1723                 if (IS_ERR(pages)) {
1724                         ret = PTR_ERR(pages);
1725                         break;
1726                 }
1727
1728                 /* Do we need to preload the pages? */
1729                 if (rmw) {
1730                         u64 first_pos = write_pos;
1731                         u64 last_pos = (write_pos + write_len) - CEPH_FSCRYPT_BLOCK_SIZE;
1732                         u64 read_len = CEPH_FSCRYPT_BLOCK_SIZE;
1733                         struct ceph_osd_req_op *op;
1734
1735                         /* We should only need to do this for encrypted inodes */
1736                         WARN_ON_ONCE(!IS_ENCRYPTED(inode));
1737
1738                         /* No need to do two reads if first and last blocks are same */
1739                         if (first && last_pos == first_pos)
1740                                 last = false;
1741
1742                         /*
1743                          * Allocate a read request for one or two extents,
1744                          * depending on how the request was aligned.
1745                          */
1746                         req = ceph_osdc_new_request(osdc, &ci->i_layout,
1747                                         ci->i_vino, first ? first_pos : last_pos,
1748                                         &read_len, 0, (first && last) ? 2 : 1,
1749                                         CEPH_OSD_OP_SPARSE_READ, CEPH_OSD_FLAG_READ,
1750                                         NULL, ci->i_truncate_seq,
1751                                         ci->i_truncate_size, false);
1752                         if (IS_ERR(req)) {
1753                                 ceph_release_page_vector(pages, num_pages);
1754                                 ret = PTR_ERR(req);
1755                                 break;
1756                         }
1757
1758                         /* Something is misaligned! */
1759                         if (read_len != CEPH_FSCRYPT_BLOCK_SIZE) {
1760                                 ceph_osdc_put_request(req);
1761                                 ceph_release_page_vector(pages, num_pages);
1762                                 ret = -EIO;
1763                                 break;
1764                         }
1765
1766                         /* Add extent for first block? */
1767                         op = &req->r_ops[0];
1768
1769                         if (first) {
1770                                 osd_req_op_extent_osd_data_pages(req, 0, pages,
1771                                                          CEPH_FSCRYPT_BLOCK_SIZE,
1772                                                          offset_in_page(first_pos),
1773                                                          false, false);
1774                                 /* We only expect a single extent here */
1775                                 ret = __ceph_alloc_sparse_ext_map(op, 1);
1776                                 if (ret) {
1777                                         ceph_osdc_put_request(req);
1778                                         ceph_release_page_vector(pages, num_pages);
1779                                         break;
1780                                 }
1781                         }
1782
1783                         /* Add extent for last block */
1784                         if (last) {
1785                                 /* Init the other extent if first extent has been used */
1786                                 if (first) {
1787                                         op = &req->r_ops[1];
1788                                         osd_req_op_extent_init(req, 1,
1789                                                         CEPH_OSD_OP_SPARSE_READ,
1790                                                         last_pos, CEPH_FSCRYPT_BLOCK_SIZE,
1791                                                         ci->i_truncate_size,
1792                                                         ci->i_truncate_seq);
1793                                 }
1794
1795                                 ret = __ceph_alloc_sparse_ext_map(op, 1);
1796                                 if (ret) {
1797                                         ceph_osdc_put_request(req);
1798                                         ceph_release_page_vector(pages, num_pages);
1799                                         break;
1800                                 }
1801
1802                                 osd_req_op_extent_osd_data_pages(req, first ? 1 : 0,
1803                                                         &pages[num_pages - 1],
1804                                                         CEPH_FSCRYPT_BLOCK_SIZE,
1805                                                         offset_in_page(last_pos),
1806                                                         false, false);
1807                         }
1808
1809                         ceph_osdc_start_request(osdc, req);
1810                         ret = ceph_osdc_wait_request(osdc, req);
1811
1812                         /* FIXME: length field is wrong if there are 2 extents */
1813                         ceph_update_read_metrics(&fsc->mdsc->metric,
1814                                                  req->r_start_latency,
1815                                                  req->r_end_latency,
1816                                                  read_len, ret);
1817
1818                         /* Ok if object is not already present */
1819                         if (ret == -ENOENT) {
1820                                 /*
1821                                  * If there is no object, then we can't assert
1822                                  * on its version. Set it to 0, and we'll use an
1823                                  * exclusive create instead.
1824                                  */
1825                                 ceph_osdc_put_request(req);
1826                                 ret = 0;
1827
1828                                 /*
1829                                  * zero out the soon-to-be uncopied parts of the
1830                                  * first and last pages.
1831                                  */
1832                                 if (first)
1833                                         zero_user_segment(pages[0], 0,
1834                                                           offset_in_page(first_pos));
1835                                 if (last)
1836                                         zero_user_segment(pages[num_pages - 1],
1837                                                           offset_in_page(last_pos),
1838                                                           PAGE_SIZE);
1839                         } else {
1840                                 if (ret < 0) {
1841                                         ceph_osdc_put_request(req);
1842                                         ceph_release_page_vector(pages, num_pages);
1843                                         break;
1844                                 }
1845
1846                                 op = &req->r_ops[0];
1847                                 if (op->extent.sparse_ext_cnt == 0) {
1848                                         if (first)
1849                                                 zero_user_segment(pages[0], 0,
1850                                                                   offset_in_page(first_pos));
1851                                         else
1852                                                 zero_user_segment(pages[num_pages - 1],
1853                                                                   offset_in_page(last_pos),
1854                                                                   PAGE_SIZE);
1855                                 } else if (op->extent.sparse_ext_cnt != 1 ||
1856                                            ceph_sparse_ext_map_end(op) !=
1857                                                 CEPH_FSCRYPT_BLOCK_SIZE) {
1858                                         ret = -EIO;
1859                                         ceph_osdc_put_request(req);
1860                                         ceph_release_page_vector(pages, num_pages);
1861                                         break;
1862                                 }
1863
1864                                 if (first && last) {
1865                                         op = &req->r_ops[1];
1866                                         if (op->extent.sparse_ext_cnt == 0) {
1867                                                 zero_user_segment(pages[num_pages - 1],
1868                                                                   offset_in_page(last_pos),
1869                                                                   PAGE_SIZE);
1870                                         } else if (op->extent.sparse_ext_cnt != 1 ||
1871                                                    ceph_sparse_ext_map_end(op) !=
1872                                                         CEPH_FSCRYPT_BLOCK_SIZE) {
1873                                                 ret = -EIO;
1874                                                 ceph_osdc_put_request(req);
1875                                                 ceph_release_page_vector(pages, num_pages);
1876                                                 break;
1877                                         }
1878                                 }
1879
1880                                 /* Grab assert version. It must be non-zero. */
1881                                 assert_ver = req->r_version;
1882                                 WARN_ON_ONCE(ret > 0 && assert_ver == 0);
1883
1884                                 ceph_osdc_put_request(req);
1885                                 if (first) {
1886                                         ret = ceph_fscrypt_decrypt_block_inplace(inode,
1887                                                         pages[0], CEPH_FSCRYPT_BLOCK_SIZE,
1888                                                         offset_in_page(first_pos),
1889                                                         first_pos >> CEPH_FSCRYPT_BLOCK_SHIFT);
1890                                         if (ret < 0) {
1891                                                 ceph_release_page_vector(pages, num_pages);
1892                                                 break;
1893                                         }
1894                                 }
1895                                 if (last) {
1896                                         ret = ceph_fscrypt_decrypt_block_inplace(inode,
1897                                                         pages[num_pages - 1],
1898                                                         CEPH_FSCRYPT_BLOCK_SIZE,
1899                                                         offset_in_page(last_pos),
1900                                                         last_pos >> CEPH_FSCRYPT_BLOCK_SHIFT);
1901                                         if (ret < 0) {
1902                                                 ceph_release_page_vector(pages, num_pages);
1903                                                 break;
1904                                         }
1905                                 }
1906                         }
1907                 }
1908
1909                 left = len;
1910                 off = offset_in_page(pos);
1911                 for (n = 0; n < num_pages; n++) {
1912                         size_t plen = min_t(size_t, left, PAGE_SIZE - off);
1913
1914                         /* copy the data */
1915                         ret = copy_page_from_iter(pages[n], off, plen, from);
1916                         if (ret != plen) {
1917                                 ret = -EFAULT;
1918                                 break;
1919                         }
1920                         off = 0;
1921                         left -= ret;
1922                 }
1923                 if (ret < 0) {
1924                         doutc(cl, "write failed with %d\n", ret);
1925                         ceph_release_page_vector(pages, num_pages);
1926                         break;
1927                 }
1928
1929                 if (IS_ENCRYPTED(inode)) {
1930                         ret = ceph_fscrypt_encrypt_pages(inode, pages,
1931                                                          write_pos, write_len,
1932                                                          GFP_KERNEL);
1933                         if (ret < 0) {
1934                                 doutc(cl, "encryption failed with %d\n", ret);
1935                                 ceph_release_page_vector(pages, num_pages);
1936                                 break;
1937                         }
1938                 }
1939
1940                 req = ceph_osdc_new_request(osdc, &ci->i_layout,
1941                                             ci->i_vino, write_pos, &write_len,
1942                                             rmw ? 1 : 0, rmw ? 2 : 1,
1943                                             CEPH_OSD_OP_WRITE,
1944                                             CEPH_OSD_FLAG_WRITE,
1945                                             snapc, ci->i_truncate_seq,
1946                                             ci->i_truncate_size, false);
1947                 if (IS_ERR(req)) {
1948                         ret = PTR_ERR(req);
1949                         ceph_release_page_vector(pages, num_pages);
1950                         break;
1951                 }
1952
1953                 doutc(cl, "write op %lld~%llu\n", write_pos, write_len);
1954                 osd_req_op_extent_osd_data_pages(req, rmw ? 1 : 0, pages, write_len,
1955                                                  offset_in_page(write_pos), false,
1956                                                  true);
1957                 req->r_inode = inode;
1958                 req->r_mtime = mtime;
1959
1960                 /* Set up the assertion */
1961                 if (rmw) {
1962                         /*
1963                          * Set up the assertion. If we don't have a version
1964                          * number, then the object doesn't exist yet. Use an
1965                          * exclusive create instead of a version assertion in
1966                          * that case.
1967                          */
1968                         if (assert_ver) {
1969                                 osd_req_op_init(req, 0, CEPH_OSD_OP_ASSERT_VER, 0);
1970                                 req->r_ops[0].assert_ver.ver = assert_ver;
1971                         } else {
1972                                 osd_req_op_init(req, 0, CEPH_OSD_OP_CREATE,
1973                                                 CEPH_OSD_OP_FLAG_EXCL);
1974                         }
1975                 }
1976
1977                 ceph_osdc_start_request(osdc, req);
1978                 ret = ceph_osdc_wait_request(osdc, req);
1979
1980                 ceph_update_write_metrics(&fsc->mdsc->metric, req->r_start_latency,
1981                                           req->r_end_latency, len, ret);
1982                 ceph_osdc_put_request(req);
1983                 if (ret != 0) {
1984                         doutc(cl, "osd write returned %d\n", ret);
1985                         /* Version changed! Must re-do the rmw cycle */
1986                         if ((assert_ver && (ret == -ERANGE || ret == -EOVERFLOW)) ||
1987                             (!assert_ver && ret == -EEXIST)) {
1988                                 /* We should only ever see this on a rmw */
1989                                 WARN_ON_ONCE(!rmw);
1990
1991                                 /* The version should never go backward */
1992                                 WARN_ON_ONCE(ret == -EOVERFLOW);
1993
1994                                 *from = saved_iter;
1995
1996                                 /* FIXME: limit number of times we loop? */
1997                                 continue;
1998                         }
1999                         ceph_set_error_write(ci);
2000                         break;
2001                 }
2002
2003                 ceph_clear_error_write(ci);
2004
2005                 /*
2006                  * We successfully wrote to a range of the file. Declare
2007                  * that region of the pagecache invalid.
2008                  */
2009                 ret = invalidate_inode_pages2_range(
2010                                 inode->i_mapping,
2011                                 pos >> PAGE_SHIFT,
2012                                 (pos + len - 1) >> PAGE_SHIFT);
2013                 if (ret < 0) {
2014                         doutc(cl, "invalidate_inode_pages2_range returned %d\n",
2015                               ret);
2016                         ret = 0;
2017                 }
2018                 pos += len;
2019                 written += len;
2020                 doutc(cl, "written %d\n", written);
2021                 if (pos > i_size_read(inode)) {
2022                         check_caps = ceph_inode_set_size(inode, pos);
2023                         if (check_caps)
2024                                 ceph_check_caps(ceph_inode(inode),
2025                                                 CHECK_CAPS_AUTHONLY);
2026                 }
2027
2028         }
2029
2030         if (ret != -EOLDSNAPC && written > 0) {
2031                 ret = written;
2032                 iocb->ki_pos = pos;
2033         }
2034         doutc(cl, "returning %d\n", ret);
2035         return ret;
2036 }
2037
2038 /*
2039  * Wrap generic_file_aio_read with checks for cap bits on the inode.
2040  * Atomically grab references, so that those bits are not released
2041  * back to the MDS mid-read.
2042  *
2043  * Hmm, the sync read case isn't actually async... should it be?
2044  */
2045 static ssize_t ceph_read_iter(struct kiocb *iocb, struct iov_iter *to)
2046 {
2047         struct file *filp = iocb->ki_filp;
2048         struct ceph_file_info *fi = filp->private_data;
2049         size_t len = iov_iter_count(to);
2050         struct inode *inode = file_inode(filp);
2051         struct ceph_inode_info *ci = ceph_inode(inode);
2052         bool direct_lock = iocb->ki_flags & IOCB_DIRECT;
2053         struct ceph_client *cl = ceph_inode_to_client(inode);
2054         ssize_t ret;
2055         int want = 0, got = 0;
2056         int retry_op = 0, read = 0;
2057
2058 again:
2059         doutc(cl, "%llu~%u trying to get caps on %p %llx.%llx\n",
2060               iocb->ki_pos, (unsigned)len, inode, ceph_vinop(inode));
2061
2062         if (ceph_inode_is_shutdown(inode))
2063                 return -ESTALE;
2064
2065         if (direct_lock)
2066                 ceph_start_io_direct(inode);
2067         else
2068                 ceph_start_io_read(inode);
2069
2070         if (!(fi->flags & CEPH_F_SYNC) && !direct_lock)
2071                 want |= CEPH_CAP_FILE_CACHE;
2072         if (fi->fmode & CEPH_FILE_MODE_LAZY)
2073                 want |= CEPH_CAP_FILE_LAZYIO;
2074
2075         ret = ceph_get_caps(filp, CEPH_CAP_FILE_RD, want, -1, &got);
2076         if (ret < 0) {
2077                 if (direct_lock)
2078                         ceph_end_io_direct(inode);
2079                 else
2080                         ceph_end_io_read(inode);
2081                 return ret;
2082         }
2083
2084         if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 ||
2085             (iocb->ki_flags & IOCB_DIRECT) ||
2086             (fi->flags & CEPH_F_SYNC)) {
2087
2088                 doutc(cl, "sync %p %llx.%llx %llu~%u got cap refs on %s\n",
2089                       inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
2090                       ceph_cap_string(got));
2091
2092                 if (!ceph_has_inline_data(ci)) {
2093                         if (!retry_op &&
2094                             (iocb->ki_flags & IOCB_DIRECT) &&
2095                             !IS_ENCRYPTED(inode)) {
2096                                 ret = ceph_direct_read_write(iocb, to,
2097                                                              NULL, NULL);
2098                                 if (ret >= 0 && ret < len)
2099                                         retry_op = CHECK_EOF;
2100                         } else {
2101                                 ret = ceph_sync_read(iocb, to, &retry_op);
2102                         }
2103                 } else {
2104                         retry_op = READ_INLINE;
2105                 }
2106         } else {
2107                 CEPH_DEFINE_RW_CONTEXT(rw_ctx, got);
2108                 doutc(cl, "async %p %llx.%llx %llu~%u got cap refs on %s\n",
2109                       inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
2110                       ceph_cap_string(got));
2111                 ceph_add_rw_context(fi, &rw_ctx);
2112                 ret = generic_file_read_iter(iocb, to);
2113                 ceph_del_rw_context(fi, &rw_ctx);
2114         }
2115
2116         doutc(cl, "%p %llx.%llx dropping cap refs on %s = %d\n",
2117               inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret);
2118         ceph_put_cap_refs(ci, got);
2119
2120         if (direct_lock)
2121                 ceph_end_io_direct(inode);
2122         else
2123                 ceph_end_io_read(inode);
2124
2125         if (retry_op > HAVE_RETRIED && ret >= 0) {
2126                 int statret;
2127                 struct page *page = NULL;
2128                 loff_t i_size;
2129                 if (retry_op == READ_INLINE) {
2130                         page = __page_cache_alloc(GFP_KERNEL);
2131                         if (!page)
2132                                 return -ENOMEM;
2133                 }
2134
2135                 statret = __ceph_do_getattr(inode, page,
2136                                             CEPH_STAT_CAP_INLINE_DATA, !!page);
2137                 if (statret < 0) {
2138                         if (page)
2139                                 __free_page(page);
2140                         if (statret == -ENODATA) {
2141                                 BUG_ON(retry_op != READ_INLINE);
2142                                 goto again;
2143                         }
2144                         return statret;
2145                 }
2146
2147                 i_size = i_size_read(inode);
2148                 if (retry_op == READ_INLINE) {
2149                         BUG_ON(ret > 0 || read > 0);
2150                         if (iocb->ki_pos < i_size &&
2151                             iocb->ki_pos < PAGE_SIZE) {
2152                                 loff_t end = min_t(loff_t, i_size,
2153                                                    iocb->ki_pos + len);
2154                                 end = min_t(loff_t, end, PAGE_SIZE);
2155                                 if (statret < end)
2156                                         zero_user_segment(page, statret, end);
2157                                 ret = copy_page_to_iter(page,
2158                                                 iocb->ki_pos & ~PAGE_MASK,
2159                                                 end - iocb->ki_pos, to);
2160                                 iocb->ki_pos += ret;
2161                                 read += ret;
2162                         }
2163                         if (iocb->ki_pos < i_size && read < len) {
2164                                 size_t zlen = min_t(size_t, len - read,
2165                                                     i_size - iocb->ki_pos);
2166                                 ret = iov_iter_zero(zlen, to);
2167                                 iocb->ki_pos += ret;
2168                                 read += ret;
2169                         }
2170                         __free_pages(page, 0);
2171                         return read;
2172                 }
2173
2174                 /* hit EOF or hole? */
2175                 if (retry_op == CHECK_EOF && iocb->ki_pos < i_size &&
2176                     ret < len) {
2177                         doutc(cl, "hit hole, ppos %lld < size %lld, reading more\n",
2178                               iocb->ki_pos, i_size);
2179
2180                         read += ret;
2181                         len -= ret;
2182                         retry_op = HAVE_RETRIED;
2183                         goto again;
2184                 }
2185         }
2186
2187         if (ret >= 0)
2188                 ret += read;
2189
2190         return ret;
2191 }
2192
2193 /*
2194  * Wrap filemap_splice_read with checks for cap bits on the inode.
2195  * Atomically grab references, so that those bits are not released
2196  * back to the MDS mid-read.
2197  */
2198 static ssize_t ceph_splice_read(struct file *in, loff_t *ppos,
2199                                 struct pipe_inode_info *pipe,
2200                                 size_t len, unsigned int flags)
2201 {
2202         struct ceph_file_info *fi = in->private_data;
2203         struct inode *inode = file_inode(in);
2204         struct ceph_inode_info *ci = ceph_inode(inode);
2205         ssize_t ret;
2206         int want = 0, got = 0;
2207         CEPH_DEFINE_RW_CONTEXT(rw_ctx, 0);
2208
2209         dout("splice_read %p %llx.%llx %llu~%zu trying to get caps on %p\n",
2210              inode, ceph_vinop(inode), *ppos, len, inode);
2211
2212         if (ceph_inode_is_shutdown(inode))
2213                 return -ESTALE;
2214
2215         if (ceph_has_inline_data(ci) ||
2216             (fi->flags & CEPH_F_SYNC))
2217                 return copy_splice_read(in, ppos, pipe, len, flags);
2218
2219         ceph_start_io_read(inode);
2220
2221         want = CEPH_CAP_FILE_CACHE;
2222         if (fi->fmode & CEPH_FILE_MODE_LAZY)
2223                 want |= CEPH_CAP_FILE_LAZYIO;
2224
2225         ret = ceph_get_caps(in, CEPH_CAP_FILE_RD, want, -1, &got);
2226         if (ret < 0)
2227                 goto out_end;
2228
2229         if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) == 0) {
2230                 dout("splice_read/sync %p %llx.%llx %llu~%zu got cap refs on %s\n",
2231                      inode, ceph_vinop(inode), *ppos, len,
2232                      ceph_cap_string(got));
2233
2234                 ceph_put_cap_refs(ci, got);
2235                 ceph_end_io_read(inode);
2236                 return copy_splice_read(in, ppos, pipe, len, flags);
2237         }
2238
2239         dout("splice_read %p %llx.%llx %llu~%zu got cap refs on %s\n",
2240              inode, ceph_vinop(inode), *ppos, len, ceph_cap_string(got));
2241
2242         rw_ctx.caps = got;
2243         ceph_add_rw_context(fi, &rw_ctx);
2244         ret = filemap_splice_read(in, ppos, pipe, len, flags);
2245         ceph_del_rw_context(fi, &rw_ctx);
2246
2247         dout("splice_read %p %llx.%llx dropping cap refs on %s = %zd\n",
2248              inode, ceph_vinop(inode), ceph_cap_string(got), ret);
2249
2250         ceph_put_cap_refs(ci, got);
2251 out_end:
2252         ceph_end_io_read(inode);
2253         return ret;
2254 }
2255
2256 /*
2257  * Take cap references to avoid releasing caps to MDS mid-write.
2258  *
2259  * If we are synchronous, and write with an old snap context, the OSD
2260  * may return EOLDSNAPC.  In that case, retry the write.. _after_
2261  * dropping our cap refs and allowing the pending snap to logically
2262  * complete _before_ this write occurs.
2263  *
2264  * If we are near ENOSPC, write synchronously.
2265  */
2266 static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from)
2267 {
2268         struct file *file = iocb->ki_filp;
2269         struct ceph_file_info *fi = file->private_data;
2270         struct inode *inode = file_inode(file);
2271         struct ceph_inode_info *ci = ceph_inode(inode);
2272         struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
2273         struct ceph_client *cl = fsc->client;
2274         struct ceph_osd_client *osdc = &fsc->client->osdc;
2275         struct ceph_cap_flush *prealloc_cf;
2276         ssize_t count, written = 0;
2277         int err, want = 0, got;
2278         bool direct_lock = false;
2279         u32 map_flags;
2280         u64 pool_flags;
2281         loff_t pos;
2282         loff_t limit = max(i_size_read(inode), fsc->max_file_size);
2283
2284         if (ceph_inode_is_shutdown(inode))
2285                 return -ESTALE;
2286
2287         if (ceph_snap(inode) != CEPH_NOSNAP)
2288                 return -EROFS;
2289
2290         prealloc_cf = ceph_alloc_cap_flush();
2291         if (!prealloc_cf)
2292                 return -ENOMEM;
2293
2294         if ((iocb->ki_flags & (IOCB_DIRECT | IOCB_APPEND)) == IOCB_DIRECT)
2295                 direct_lock = true;
2296
2297 retry_snap:
2298         if (direct_lock)
2299                 ceph_start_io_direct(inode);
2300         else
2301                 ceph_start_io_write(inode);
2302
2303         if (iocb->ki_flags & IOCB_APPEND) {
2304                 err = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
2305                 if (err < 0)
2306                         goto out;
2307         }
2308
2309         err = generic_write_checks(iocb, from);
2310         if (err <= 0)
2311                 goto out;
2312
2313         pos = iocb->ki_pos;
2314         if (unlikely(pos >= limit)) {
2315                 err = -EFBIG;
2316                 goto out;
2317         } else {
2318                 iov_iter_truncate(from, limit - pos);
2319         }
2320
2321         count = iov_iter_count(from);
2322         if (ceph_quota_is_max_bytes_exceeded(inode, pos + count)) {
2323                 err = -EDQUOT;
2324                 goto out;
2325         }
2326
2327         down_read(&osdc->lock);
2328         map_flags = osdc->osdmap->flags;
2329         pool_flags = ceph_pg_pool_flags(osdc->osdmap, ci->i_layout.pool_id);
2330         up_read(&osdc->lock);
2331         if ((map_flags & CEPH_OSDMAP_FULL) ||
2332             (pool_flags & CEPH_POOL_FLAG_FULL)) {
2333                 err = -ENOSPC;
2334                 goto out;
2335         }
2336
2337         err = file_remove_privs(file);
2338         if (err)
2339                 goto out;
2340
2341         doutc(cl, "%p %llx.%llx %llu~%zd getting caps. i_size %llu\n",
2342               inode, ceph_vinop(inode), pos, count,
2343               i_size_read(inode));
2344         if (!(fi->flags & CEPH_F_SYNC) && !direct_lock)
2345                 want |= CEPH_CAP_FILE_BUFFER;
2346         if (fi->fmode & CEPH_FILE_MODE_LAZY)
2347                 want |= CEPH_CAP_FILE_LAZYIO;
2348         got = 0;
2349         err = ceph_get_caps(file, CEPH_CAP_FILE_WR, want, pos + count, &got);
2350         if (err < 0)
2351                 goto out;
2352
2353         err = file_update_time(file);
2354         if (err)
2355                 goto out_caps;
2356
2357         inode_inc_iversion_raw(inode);
2358
2359         doutc(cl, "%p %llx.%llx %llu~%zd got cap refs on %s\n",
2360               inode, ceph_vinop(inode), pos, count, ceph_cap_string(got));
2361
2362         if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 ||
2363             (iocb->ki_flags & IOCB_DIRECT) || (fi->flags & CEPH_F_SYNC) ||
2364             (ci->i_ceph_flags & CEPH_I_ERROR_WRITE)) {
2365                 struct ceph_snap_context *snapc;
2366                 struct iov_iter data;
2367
2368                 spin_lock(&ci->i_ceph_lock);
2369                 if (__ceph_have_pending_cap_snap(ci)) {
2370                         struct ceph_cap_snap *capsnap =
2371                                         list_last_entry(&ci->i_cap_snaps,
2372                                                         struct ceph_cap_snap,
2373                                                         ci_item);
2374                         snapc = ceph_get_snap_context(capsnap->context);
2375                 } else {
2376                         BUG_ON(!ci->i_head_snapc);
2377                         snapc = ceph_get_snap_context(ci->i_head_snapc);
2378                 }
2379                 spin_unlock(&ci->i_ceph_lock);
2380
2381                 /* we might need to revert back to that point */
2382                 data = *from;
2383                 if ((iocb->ki_flags & IOCB_DIRECT) && !IS_ENCRYPTED(inode))
2384                         written = ceph_direct_read_write(iocb, &data, snapc,
2385                                                          &prealloc_cf);
2386                 else
2387                         written = ceph_sync_write(iocb, &data, pos, snapc);
2388                 if (direct_lock)
2389                         ceph_end_io_direct(inode);
2390                 else
2391                         ceph_end_io_write(inode);
2392                 if (written > 0)
2393                         iov_iter_advance(from, written);
2394                 ceph_put_snap_context(snapc);
2395         } else {
2396                 /*
2397                  * No need to acquire the i_truncate_mutex. Because
2398                  * the MDS revokes Fwb caps before sending truncate
2399                  * message to us. We can't get Fwb cap while there
2400                  * are pending vmtruncate. So write and vmtruncate
2401                  * can not run at the same time
2402                  */
2403                 written = generic_perform_write(iocb, from);
2404                 ceph_end_io_write(inode);
2405         }
2406
2407         if (written >= 0) {
2408                 int dirty;
2409
2410                 spin_lock(&ci->i_ceph_lock);
2411                 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
2412                                                &prealloc_cf);
2413                 spin_unlock(&ci->i_ceph_lock);
2414                 if (dirty)
2415                         __mark_inode_dirty(inode, dirty);
2416                 if (ceph_quota_is_max_bytes_approaching(inode, iocb->ki_pos))
2417                         ceph_check_caps(ci, CHECK_CAPS_FLUSH);
2418         }
2419
2420         doutc(cl, "%p %llx.%llx %llu~%u  dropping cap refs on %s\n",
2421               inode, ceph_vinop(inode), pos, (unsigned)count,
2422               ceph_cap_string(got));
2423         ceph_put_cap_refs(ci, got);
2424
2425         if (written == -EOLDSNAPC) {
2426                 doutc(cl, "%p %llx.%llx %llu~%u" "got EOLDSNAPC, retrying\n",
2427                       inode, ceph_vinop(inode), pos, (unsigned)count);
2428                 goto retry_snap;
2429         }
2430
2431         if (written >= 0) {
2432                 if ((map_flags & CEPH_OSDMAP_NEARFULL) ||
2433                     (pool_flags & CEPH_POOL_FLAG_NEARFULL))
2434                         iocb->ki_flags |= IOCB_DSYNC;
2435                 written = generic_write_sync(iocb, written);
2436         }
2437
2438         goto out_unlocked;
2439 out_caps:
2440         ceph_put_cap_refs(ci, got);
2441 out:
2442         if (direct_lock)
2443                 ceph_end_io_direct(inode);
2444         else
2445                 ceph_end_io_write(inode);
2446 out_unlocked:
2447         ceph_free_cap_flush(prealloc_cf);
2448         return written ? written : err;
2449 }
2450
2451 /*
2452  * llseek.  be sure to verify file size on SEEK_END.
2453  */
2454 static loff_t ceph_llseek(struct file *file, loff_t offset, int whence)
2455 {
2456         if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) {
2457                 struct inode *inode = file_inode(file);
2458                 int ret;
2459
2460                 ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
2461                 if (ret < 0)
2462                         return ret;
2463         }
2464         return generic_file_llseek(file, offset, whence);
2465 }
2466
2467 static inline void ceph_zero_partial_page(
2468         struct inode *inode, loff_t offset, unsigned size)
2469 {
2470         struct page *page;
2471         pgoff_t index = offset >> PAGE_SHIFT;
2472
2473         page = find_lock_page(inode->i_mapping, index);
2474         if (page) {
2475                 wait_on_page_writeback(page);
2476                 zero_user(page, offset & (PAGE_SIZE - 1), size);
2477                 unlock_page(page);
2478                 put_page(page);
2479         }
2480 }
2481
2482 static void ceph_zero_pagecache_range(struct inode *inode, loff_t offset,
2483                                       loff_t length)
2484 {
2485         loff_t nearly = round_up(offset, PAGE_SIZE);
2486         if (offset < nearly) {
2487                 loff_t size = nearly - offset;
2488                 if (length < size)
2489                         size = length;
2490                 ceph_zero_partial_page(inode, offset, size);
2491                 offset += size;
2492                 length -= size;
2493         }
2494         if (length >= PAGE_SIZE) {
2495                 loff_t size = round_down(length, PAGE_SIZE);
2496                 truncate_pagecache_range(inode, offset, offset + size - 1);
2497                 offset += size;
2498                 length -= size;
2499         }
2500         if (length)
2501                 ceph_zero_partial_page(inode, offset, length);
2502 }
2503
2504 static int ceph_zero_partial_object(struct inode *inode,
2505                                     loff_t offset, loff_t *length)
2506 {
2507         struct ceph_inode_info *ci = ceph_inode(inode);
2508         struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
2509         struct ceph_osd_request *req;
2510         int ret = 0;
2511         loff_t zero = 0;
2512         int op;
2513
2514         if (ceph_inode_is_shutdown(inode))
2515                 return -EIO;
2516
2517         if (!length) {
2518                 op = offset ? CEPH_OSD_OP_DELETE : CEPH_OSD_OP_TRUNCATE;
2519                 length = &zero;
2520         } else {
2521                 op = CEPH_OSD_OP_ZERO;
2522         }
2523
2524         req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
2525                                         ceph_vino(inode),
2526                                         offset, length,
2527                                         0, 1, op,
2528                                         CEPH_OSD_FLAG_WRITE,
2529                                         NULL, 0, 0, false);
2530         if (IS_ERR(req)) {
2531                 ret = PTR_ERR(req);
2532                 goto out;
2533         }
2534
2535         req->r_mtime = inode_get_mtime(inode);
2536         ceph_osdc_start_request(&fsc->client->osdc, req);
2537         ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
2538         if (ret == -ENOENT)
2539                 ret = 0;
2540         ceph_osdc_put_request(req);
2541
2542 out:
2543         return ret;
2544 }
2545
2546 static int ceph_zero_objects(struct inode *inode, loff_t offset, loff_t length)
2547 {
2548         int ret = 0;
2549         struct ceph_inode_info *ci = ceph_inode(inode);
2550         s32 stripe_unit = ci->i_layout.stripe_unit;
2551         s32 stripe_count = ci->i_layout.stripe_count;
2552         s32 object_size = ci->i_layout.object_size;
2553         u64 object_set_size = object_size * stripe_count;
2554         u64 nearly, t;
2555
2556         /* round offset up to next period boundary */
2557         nearly = offset + object_set_size - 1;
2558         t = nearly;
2559         nearly -= do_div(t, object_set_size);
2560
2561         while (length && offset < nearly) {
2562                 loff_t size = length;
2563                 ret = ceph_zero_partial_object(inode, offset, &size);
2564                 if (ret < 0)
2565                         return ret;
2566                 offset += size;
2567                 length -= size;
2568         }
2569         while (length >= object_set_size) {
2570                 int i;
2571                 loff_t pos = offset;
2572                 for (i = 0; i < stripe_count; ++i) {
2573                         ret = ceph_zero_partial_object(inode, pos, NULL);
2574                         if (ret < 0)
2575                                 return ret;
2576                         pos += stripe_unit;
2577                 }
2578                 offset += object_set_size;
2579                 length -= object_set_size;
2580         }
2581         while (length) {
2582                 loff_t size = length;
2583                 ret = ceph_zero_partial_object(inode, offset, &size);
2584                 if (ret < 0)
2585                         return ret;
2586                 offset += size;
2587                 length -= size;
2588         }
2589         return ret;
2590 }
2591
2592 static long ceph_fallocate(struct file *file, int mode,
2593                                 loff_t offset, loff_t length)
2594 {
2595         struct ceph_file_info *fi = file->private_data;
2596         struct inode *inode = file_inode(file);
2597         struct ceph_inode_info *ci = ceph_inode(inode);
2598         struct ceph_cap_flush *prealloc_cf;
2599         struct ceph_client *cl = ceph_inode_to_client(inode);
2600         int want, got = 0;
2601         int dirty;
2602         int ret = 0;
2603         loff_t endoff = 0;
2604         loff_t size;
2605
2606         doutc(cl, "%p %llx.%llx mode %x, offset %llu length %llu\n",
2607               inode, ceph_vinop(inode), mode, offset, length);
2608
2609         if (mode != (FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
2610                 return -EOPNOTSUPP;
2611
2612         if (!S_ISREG(inode->i_mode))
2613                 return -EOPNOTSUPP;
2614
2615         if (IS_ENCRYPTED(inode))
2616                 return -EOPNOTSUPP;
2617
2618         prealloc_cf = ceph_alloc_cap_flush();
2619         if (!prealloc_cf)
2620                 return -ENOMEM;
2621
2622         inode_lock(inode);
2623
2624         if (ceph_snap(inode) != CEPH_NOSNAP) {
2625                 ret = -EROFS;
2626                 goto unlock;
2627         }
2628
2629         size = i_size_read(inode);
2630
2631         /* Are we punching a hole beyond EOF? */
2632         if (offset >= size)
2633                 goto unlock;
2634         if ((offset + length) > size)
2635                 length = size - offset;
2636
2637         if (fi->fmode & CEPH_FILE_MODE_LAZY)
2638                 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
2639         else
2640                 want = CEPH_CAP_FILE_BUFFER;
2641
2642         ret = ceph_get_caps(file, CEPH_CAP_FILE_WR, want, endoff, &got);
2643         if (ret < 0)
2644                 goto unlock;
2645
2646         ret = file_modified(file);
2647         if (ret)
2648                 goto put_caps;
2649
2650         filemap_invalidate_lock(inode->i_mapping);
2651         ceph_fscache_invalidate(inode, false);
2652         ceph_zero_pagecache_range(inode, offset, length);
2653         ret = ceph_zero_objects(inode, offset, length);
2654
2655         if (!ret) {
2656                 spin_lock(&ci->i_ceph_lock);
2657                 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
2658                                                &prealloc_cf);
2659                 spin_unlock(&ci->i_ceph_lock);
2660                 if (dirty)
2661                         __mark_inode_dirty(inode, dirty);
2662         }
2663         filemap_invalidate_unlock(inode->i_mapping);
2664
2665 put_caps:
2666         ceph_put_cap_refs(ci, got);
2667 unlock:
2668         inode_unlock(inode);
2669         ceph_free_cap_flush(prealloc_cf);
2670         return ret;
2671 }
2672
2673 /*
2674  * This function tries to get FILE_WR capabilities for dst_ci and FILE_RD for
2675  * src_ci.  Two attempts are made to obtain both caps, and an error is return if
2676  * this fails; zero is returned on success.
2677  */
2678 static int get_rd_wr_caps(struct file *src_filp, int *src_got,
2679                           struct file *dst_filp,
2680                           loff_t dst_endoff, int *dst_got)
2681 {
2682         int ret = 0;
2683         bool retrying = false;
2684
2685 retry_caps:
2686         ret = ceph_get_caps(dst_filp, CEPH_CAP_FILE_WR, CEPH_CAP_FILE_BUFFER,
2687                             dst_endoff, dst_got);
2688         if (ret < 0)
2689                 return ret;
2690
2691         /*
2692          * Since we're already holding the FILE_WR capability for the dst file,
2693          * we would risk a deadlock by using ceph_get_caps.  Thus, we'll do some
2694          * retry dance instead to try to get both capabilities.
2695          */
2696         ret = ceph_try_get_caps(file_inode(src_filp),
2697                                 CEPH_CAP_FILE_RD, CEPH_CAP_FILE_SHARED,
2698                                 false, src_got);
2699         if (ret <= 0) {
2700                 /* Start by dropping dst_ci caps and getting src_ci caps */
2701                 ceph_put_cap_refs(ceph_inode(file_inode(dst_filp)), *dst_got);
2702                 if (retrying) {
2703                         if (!ret)
2704                                 /* ceph_try_get_caps masks EAGAIN */
2705                                 ret = -EAGAIN;
2706                         return ret;
2707                 }
2708                 ret = ceph_get_caps(src_filp, CEPH_CAP_FILE_RD,
2709                                     CEPH_CAP_FILE_SHARED, -1, src_got);
2710                 if (ret < 0)
2711                         return ret;
2712                 /*... drop src_ci caps too, and retry */
2713                 ceph_put_cap_refs(ceph_inode(file_inode(src_filp)), *src_got);
2714                 retrying = true;
2715                 goto retry_caps;
2716         }
2717         return ret;
2718 }
2719
2720 static void put_rd_wr_caps(struct ceph_inode_info *src_ci, int src_got,
2721                            struct ceph_inode_info *dst_ci, int dst_got)
2722 {
2723         ceph_put_cap_refs(src_ci, src_got);
2724         ceph_put_cap_refs(dst_ci, dst_got);
2725 }
2726
2727 /*
2728  * This function does several size-related checks, returning an error if:
2729  *  - source file is smaller than off+len
2730  *  - destination file size is not OK (inode_newsize_ok())
2731  *  - max bytes quotas is exceeded
2732  */
2733 static int is_file_size_ok(struct inode *src_inode, struct inode *dst_inode,
2734                            loff_t src_off, loff_t dst_off, size_t len)
2735 {
2736         struct ceph_client *cl = ceph_inode_to_client(src_inode);
2737         loff_t size, endoff;
2738
2739         size = i_size_read(src_inode);
2740         /*
2741          * Don't copy beyond source file EOF.  Instead of simply setting length
2742          * to (size - src_off), just drop to VFS default implementation, as the
2743          * local i_size may be stale due to other clients writing to the source
2744          * inode.
2745          */
2746         if (src_off + len > size) {
2747                 doutc(cl, "Copy beyond EOF (%llu + %zu > %llu)\n", src_off,
2748                       len, size);
2749                 return -EOPNOTSUPP;
2750         }
2751         size = i_size_read(dst_inode);
2752
2753         endoff = dst_off + len;
2754         if (inode_newsize_ok(dst_inode, endoff))
2755                 return -EOPNOTSUPP;
2756
2757         if (ceph_quota_is_max_bytes_exceeded(dst_inode, endoff))
2758                 return -EDQUOT;
2759
2760         return 0;
2761 }
2762
2763 static struct ceph_osd_request *
2764 ceph_alloc_copyfrom_request(struct ceph_osd_client *osdc,
2765                             u64 src_snapid,
2766                             struct ceph_object_id *src_oid,
2767                             struct ceph_object_locator *src_oloc,
2768                             struct ceph_object_id *dst_oid,
2769                             struct ceph_object_locator *dst_oloc,
2770                             u32 truncate_seq, u64 truncate_size)
2771 {
2772         struct ceph_osd_request *req;
2773         int ret;
2774         u32 src_fadvise_flags =
2775                 CEPH_OSD_OP_FLAG_FADVISE_SEQUENTIAL |
2776                 CEPH_OSD_OP_FLAG_FADVISE_NOCACHE;
2777         u32 dst_fadvise_flags =
2778                 CEPH_OSD_OP_FLAG_FADVISE_SEQUENTIAL |
2779                 CEPH_OSD_OP_FLAG_FADVISE_DONTNEED;
2780
2781         req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_KERNEL);
2782         if (!req)
2783                 return ERR_PTR(-ENOMEM);
2784
2785         req->r_flags = CEPH_OSD_FLAG_WRITE;
2786
2787         ceph_oloc_copy(&req->r_t.base_oloc, dst_oloc);
2788         ceph_oid_copy(&req->r_t.base_oid, dst_oid);
2789
2790         ret = osd_req_op_copy_from_init(req, src_snapid, 0,
2791                                         src_oid, src_oloc,
2792                                         src_fadvise_flags,
2793                                         dst_fadvise_flags,
2794                                         truncate_seq,
2795                                         truncate_size,
2796                                         CEPH_OSD_COPY_FROM_FLAG_TRUNCATE_SEQ);
2797         if (ret)
2798                 goto out;
2799
2800         ret = ceph_osdc_alloc_messages(req, GFP_KERNEL);
2801         if (ret)
2802                 goto out;
2803
2804         return req;
2805
2806 out:
2807         ceph_osdc_put_request(req);
2808         return ERR_PTR(ret);
2809 }
2810
2811 static ssize_t ceph_do_objects_copy(struct ceph_inode_info *src_ci, u64 *src_off,
2812                                     struct ceph_inode_info *dst_ci, u64 *dst_off,
2813                                     struct ceph_fs_client *fsc,
2814                                     size_t len, unsigned int flags)
2815 {
2816         struct ceph_object_locator src_oloc, dst_oloc;
2817         struct ceph_object_id src_oid, dst_oid;
2818         struct ceph_osd_client *osdc;
2819         struct ceph_osd_request *req;
2820         size_t bytes = 0;
2821         u64 src_objnum, src_objoff, dst_objnum, dst_objoff;
2822         u32 src_objlen, dst_objlen;
2823         u32 object_size = src_ci->i_layout.object_size;
2824         struct ceph_client *cl = fsc->client;
2825         int ret;
2826
2827         src_oloc.pool = src_ci->i_layout.pool_id;
2828         src_oloc.pool_ns = ceph_try_get_string(src_ci->i_layout.pool_ns);
2829         dst_oloc.pool = dst_ci->i_layout.pool_id;
2830         dst_oloc.pool_ns = ceph_try_get_string(dst_ci->i_layout.pool_ns);
2831         osdc = &fsc->client->osdc;
2832
2833         while (len >= object_size) {
2834                 ceph_calc_file_object_mapping(&src_ci->i_layout, *src_off,
2835                                               object_size, &src_objnum,
2836                                               &src_objoff, &src_objlen);
2837                 ceph_calc_file_object_mapping(&dst_ci->i_layout, *dst_off,
2838                                               object_size, &dst_objnum,
2839                                               &dst_objoff, &dst_objlen);
2840                 ceph_oid_init(&src_oid);
2841                 ceph_oid_printf(&src_oid, "%llx.%08llx",
2842                                 src_ci->i_vino.ino, src_objnum);
2843                 ceph_oid_init(&dst_oid);
2844                 ceph_oid_printf(&dst_oid, "%llx.%08llx",
2845                                 dst_ci->i_vino.ino, dst_objnum);
2846                 /* Do an object remote copy */
2847                 req = ceph_alloc_copyfrom_request(osdc, src_ci->i_vino.snap,
2848                                                   &src_oid, &src_oloc,
2849                                                   &dst_oid, &dst_oloc,
2850                                                   dst_ci->i_truncate_seq,
2851                                                   dst_ci->i_truncate_size);
2852                 if (IS_ERR(req))
2853                         ret = PTR_ERR(req);
2854                 else {
2855                         ceph_osdc_start_request(osdc, req);
2856                         ret = ceph_osdc_wait_request(osdc, req);
2857                         ceph_update_copyfrom_metrics(&fsc->mdsc->metric,
2858                                                      req->r_start_latency,
2859                                                      req->r_end_latency,
2860                                                      object_size, ret);
2861                         ceph_osdc_put_request(req);
2862                 }
2863                 if (ret) {
2864                         if (ret == -EOPNOTSUPP) {
2865                                 fsc->have_copy_from2 = false;
2866                                 pr_notice_client(cl,
2867                                         "OSDs don't support copy-from2; disabling copy offload\n");
2868                         }
2869                         doutc(cl, "returned %d\n", ret);
2870                         if (!bytes)
2871                                 bytes = ret;
2872                         goto out;
2873                 }
2874                 len -= object_size;
2875                 bytes += object_size;
2876                 *src_off += object_size;
2877                 *dst_off += object_size;
2878         }
2879
2880 out:
2881         ceph_oloc_destroy(&src_oloc);
2882         ceph_oloc_destroy(&dst_oloc);
2883         return bytes;
2884 }
2885
2886 static ssize_t __ceph_copy_file_range(struct file *src_file, loff_t src_off,
2887                                       struct file *dst_file, loff_t dst_off,
2888                                       size_t len, unsigned int flags)
2889 {
2890         struct inode *src_inode = file_inode(src_file);
2891         struct inode *dst_inode = file_inode(dst_file);
2892         struct ceph_inode_info *src_ci = ceph_inode(src_inode);
2893         struct ceph_inode_info *dst_ci = ceph_inode(dst_inode);
2894         struct ceph_cap_flush *prealloc_cf;
2895         struct ceph_fs_client *src_fsc = ceph_inode_to_fs_client(src_inode);
2896         struct ceph_client *cl = src_fsc->client;
2897         loff_t size;
2898         ssize_t ret = -EIO, bytes;
2899         u64 src_objnum, dst_objnum, src_objoff, dst_objoff;
2900         u32 src_objlen, dst_objlen;
2901         int src_got = 0, dst_got = 0, err, dirty;
2902
2903         if (src_inode->i_sb != dst_inode->i_sb) {
2904                 struct ceph_fs_client *dst_fsc = ceph_inode_to_fs_client(dst_inode);
2905
2906                 if (ceph_fsid_compare(&src_fsc->client->fsid,
2907                                       &dst_fsc->client->fsid)) {
2908                         dout("Copying files across clusters: src: %pU dst: %pU\n",
2909                              &src_fsc->client->fsid, &dst_fsc->client->fsid);
2910                         return -EXDEV;
2911                 }
2912         }
2913         if (ceph_snap(dst_inode) != CEPH_NOSNAP)
2914                 return -EROFS;
2915
2916         /*
2917          * Some of the checks below will return -EOPNOTSUPP, which will force a
2918          * fallback to the default VFS copy_file_range implementation.  This is
2919          * desirable in several cases (for ex, the 'len' is smaller than the
2920          * size of the objects, or in cases where that would be more
2921          * efficient).
2922          */
2923
2924         if (ceph_test_mount_opt(src_fsc, NOCOPYFROM))
2925                 return -EOPNOTSUPP;
2926
2927         if (!src_fsc->have_copy_from2)
2928                 return -EOPNOTSUPP;
2929
2930         /*
2931          * Striped file layouts require that we copy partial objects, but the
2932          * OSD copy-from operation only supports full-object copies.  Limit
2933          * this to non-striped file layouts for now.
2934          */
2935         if ((src_ci->i_layout.stripe_unit != dst_ci->i_layout.stripe_unit) ||
2936             (src_ci->i_layout.stripe_count != 1) ||
2937             (dst_ci->i_layout.stripe_count != 1) ||
2938             (src_ci->i_layout.object_size != dst_ci->i_layout.object_size)) {
2939                 doutc(cl, "Invalid src/dst files layout\n");
2940                 return -EOPNOTSUPP;
2941         }
2942
2943         /* Every encrypted inode gets its own key, so we can't offload them */
2944         if (IS_ENCRYPTED(src_inode) || IS_ENCRYPTED(dst_inode))
2945                 return -EOPNOTSUPP;
2946
2947         if (len < src_ci->i_layout.object_size)
2948                 return -EOPNOTSUPP; /* no remote copy will be done */
2949
2950         prealloc_cf = ceph_alloc_cap_flush();
2951         if (!prealloc_cf)
2952                 return -ENOMEM;
2953
2954         /* Start by sync'ing the source and destination files */
2955         ret = file_write_and_wait_range(src_file, src_off, (src_off + len));
2956         if (ret < 0) {
2957                 doutc(cl, "failed to write src file (%zd)\n", ret);
2958                 goto out;
2959         }
2960         ret = file_write_and_wait_range(dst_file, dst_off, (dst_off + len));
2961         if (ret < 0) {
2962                 doutc(cl, "failed to write dst file (%zd)\n", ret);
2963                 goto out;
2964         }
2965
2966         /*
2967          * We need FILE_WR caps for dst_ci and FILE_RD for src_ci as other
2968          * clients may have dirty data in their caches.  And OSDs know nothing
2969          * about caps, so they can't safely do the remote object copies.
2970          */
2971         err = get_rd_wr_caps(src_file, &src_got,
2972                              dst_file, (dst_off + len), &dst_got);
2973         if (err < 0) {
2974                 doutc(cl, "get_rd_wr_caps returned %d\n", err);
2975                 ret = -EOPNOTSUPP;
2976                 goto out;
2977         }
2978
2979         ret = is_file_size_ok(src_inode, dst_inode, src_off, dst_off, len);
2980         if (ret < 0)
2981                 goto out_caps;
2982
2983         /* Drop dst file cached pages */
2984         ceph_fscache_invalidate(dst_inode, false);
2985         ret = invalidate_inode_pages2_range(dst_inode->i_mapping,
2986                                             dst_off >> PAGE_SHIFT,
2987                                             (dst_off + len) >> PAGE_SHIFT);
2988         if (ret < 0) {
2989                 doutc(cl, "Failed to invalidate inode pages (%zd)\n",
2990                             ret);
2991                 ret = 0; /* XXX */
2992         }
2993         ceph_calc_file_object_mapping(&src_ci->i_layout, src_off,
2994                                       src_ci->i_layout.object_size,
2995                                       &src_objnum, &src_objoff, &src_objlen);
2996         ceph_calc_file_object_mapping(&dst_ci->i_layout, dst_off,
2997                                       dst_ci->i_layout.object_size,
2998                                       &dst_objnum, &dst_objoff, &dst_objlen);
2999         /* object-level offsets need to the same */
3000         if (src_objoff != dst_objoff) {
3001                 ret = -EOPNOTSUPP;
3002                 goto out_caps;
3003         }
3004
3005         /*
3006          * Do a manual copy if the object offset isn't object aligned.
3007          * 'src_objlen' contains the bytes left until the end of the object,
3008          * starting at the src_off
3009          */
3010         if (src_objoff) {
3011                 doutc(cl, "Initial partial copy of %u bytes\n", src_objlen);
3012
3013                 /*
3014                  * we need to temporarily drop all caps as we'll be calling
3015                  * {read,write}_iter, which will get caps again.
3016                  */
3017                 put_rd_wr_caps(src_ci, src_got, dst_ci, dst_got);
3018                 ret = splice_file_range(src_file, &src_off, dst_file, &dst_off,
3019                                         src_objlen);
3020                 /* Abort on short copies or on error */
3021                 if (ret < (long)src_objlen) {
3022                         doutc(cl, "Failed partial copy (%zd)\n", ret);
3023                         goto out;
3024                 }
3025                 len -= ret;
3026                 err = get_rd_wr_caps(src_file, &src_got,
3027                                      dst_file, (dst_off + len), &dst_got);
3028                 if (err < 0)
3029                         goto out;
3030                 err = is_file_size_ok(src_inode, dst_inode,
3031                                       src_off, dst_off, len);
3032                 if (err < 0)
3033                         goto out_caps;
3034         }
3035
3036         size = i_size_read(dst_inode);
3037         bytes = ceph_do_objects_copy(src_ci, &src_off, dst_ci, &dst_off,
3038                                      src_fsc, len, flags);
3039         if (bytes <= 0) {
3040                 if (!ret)
3041                         ret = bytes;
3042                 goto out_caps;
3043         }
3044         doutc(cl, "Copied %zu bytes out of %zu\n", bytes, len);
3045         len -= bytes;
3046         ret += bytes;
3047
3048         file_update_time(dst_file);
3049         inode_inc_iversion_raw(dst_inode);
3050
3051         if (dst_off > size) {
3052                 /* Let the MDS know about dst file size change */
3053                 if (ceph_inode_set_size(dst_inode, dst_off) ||
3054                     ceph_quota_is_max_bytes_approaching(dst_inode, dst_off))
3055                         ceph_check_caps(dst_ci, CHECK_CAPS_AUTHONLY | CHECK_CAPS_FLUSH);
3056         }
3057         /* Mark Fw dirty */
3058         spin_lock(&dst_ci->i_ceph_lock);
3059         dirty = __ceph_mark_dirty_caps(dst_ci, CEPH_CAP_FILE_WR, &prealloc_cf);
3060         spin_unlock(&dst_ci->i_ceph_lock);
3061         if (dirty)
3062                 __mark_inode_dirty(dst_inode, dirty);
3063
3064 out_caps:
3065         put_rd_wr_caps(src_ci, src_got, dst_ci, dst_got);
3066
3067         /*
3068          * Do the final manual copy if we still have some bytes left, unless
3069          * there were errors in remote object copies (len >= object_size).
3070          */
3071         if (len && (len < src_ci->i_layout.object_size)) {
3072                 doutc(cl, "Final partial copy of %zu bytes\n", len);
3073                 bytes = splice_file_range(src_file, &src_off, dst_file,
3074                                           &dst_off, len);
3075                 if (bytes > 0)
3076                         ret += bytes;
3077                 else
3078                         doutc(cl, "Failed partial copy (%zd)\n", bytes);
3079         }
3080
3081 out:
3082         ceph_free_cap_flush(prealloc_cf);
3083
3084         return ret;
3085 }
3086
3087 static ssize_t ceph_copy_file_range(struct file *src_file, loff_t src_off,
3088                                     struct file *dst_file, loff_t dst_off,
3089                                     size_t len, unsigned int flags)
3090 {
3091         ssize_t ret;
3092
3093         ret = __ceph_copy_file_range(src_file, src_off, dst_file, dst_off,
3094                                      len, flags);
3095
3096         if (ret == -EOPNOTSUPP || ret == -EXDEV)
3097                 ret = splice_copy_file_range(src_file, src_off, dst_file,
3098                                              dst_off, len);
3099         return ret;
3100 }
3101
3102 const struct file_operations ceph_file_fops = {
3103         .open = ceph_open,
3104         .release = ceph_release,
3105         .llseek = ceph_llseek,
3106         .read_iter = ceph_read_iter,
3107         .write_iter = ceph_write_iter,
3108         .mmap = ceph_mmap,
3109         .fsync = ceph_fsync,
3110         .lock = ceph_lock,
3111         .setlease = simple_nosetlease,
3112         .flock = ceph_flock,
3113         .splice_read = ceph_splice_read,
3114         .splice_write = iter_file_splice_write,
3115         .unlocked_ioctl = ceph_ioctl,
3116         .compat_ioctl = compat_ptr_ioctl,
3117         .fallocate      = ceph_fallocate,
3118         .copy_file_range = ceph_copy_file_range,
3119 };