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         struct dentry *dentry;
 370         char *path;
 371         int pathlen;
 372         u64 pathbase;
 373         bool do_sync = false;
 374         int mask = MAY_READ;
 375
 376         if (fi) {
 377                 doutc(cl, "file %p is already opened\n", file);
 378                 return 0;
 379         }
 380
 381         /* filter out O_CREAT|O_EXCL; vfs did that already.  yuck. */
 382         flags = file->f_flags & ~(O_CREAT|O_EXCL);
 383         if (S_ISDIR(inode->i_mode)) {
 384                 flags = O_DIRECTORY;  /* mds likes to know */
 385         } else if (S_ISREG(inode->i_mode)) {
 386                 err = fscrypt_file_open(inode, file);
 387                 if (err)
 388                         return err;
 389         }
 390
 391         doutc(cl, "%p %llx.%llx file %p flags %d (%d)\n", inode,
 392               ceph_vinop(inode), file, flags, file->f_flags);
 393         fmode = ceph_flags_to_mode(flags);
 394         wanted = ceph_caps_for_mode(fmode);
 395
 396         if (fmode & CEPH_FILE_MODE_WR)
 397                 mask |= MAY_WRITE;
 398         dentry = d_find_alias(inode);
 399         if (!dentry) {
 400                 do_sync = true;
 401         } else {
 402                 path = ceph_mdsc_build_path(mdsc, dentry, &pathlen, &pathbase, 0);
 403                 if (IS_ERR(path)) {
 404                         do_sync = true;
 405                         err = 0;
 406                 } else {
 407                         err = ceph_mds_check_access(mdsc, path, mask);
 408                 }
 409                 ceph_mdsc_free_path(path, pathlen);
 410                 dput(dentry);
 411
 412                 /* For none EACCES cases will let the MDS do the mds auth check */
 413                 if (err == -EACCES) {
 414                         return err;
 415                 } else if (err < 0) {
 416                         do_sync = true;
 417                         err = 0;
 418                 }
 419         }
 420
 421         /* snapped files are read-only */
 422         if (ceph_snap(inode) != CEPH_NOSNAP && (file->f_mode & FMODE_WRITE))
 423                 return -EROFS;
 424
 425         /* trivially open snapdir */
 426         if (ceph_snap(inode) == CEPH_SNAPDIR) {
 427                 return ceph_init_file(inode, file, fmode);
 428         }
 429
 430         /*
 431          * No need to block if we have caps on the auth MDS (for
 432          * write) or any MDS (for read).  Update wanted set
 433          * asynchronously.
 434          */
 435         spin_lock(&ci->i_ceph_lock);
 436         if (!do_sync && __ceph_is_any_real_caps(ci) &&
 437             (((fmode & CEPH_FILE_MODE_WR) == 0) || ci->i_auth_cap)) {
 438                 int mds_wanted = __ceph_caps_mds_wanted(ci, true);
 439                 int issued = __ceph_caps_issued(ci, NULL);
 440
 441                 doutc(cl, "open %p fmode %d want %s issued %s using existing\n",
 442                       inode, fmode, ceph_cap_string(wanted),
 443                       ceph_cap_string(issued));
 444                 __ceph_touch_fmode(ci, mdsc, fmode);
 445                 spin_unlock(&ci->i_ceph_lock);
 446
 447                 /* adjust wanted? */
 448                 if ((issued & wanted) != wanted &&
 449                     (mds_wanted & wanted) != wanted &&
 450                     ceph_snap(inode) != CEPH_SNAPDIR)
 451                         ceph_check_caps(ci, 0);
 452
 453                 return ceph_init_file(inode, file, fmode);
 454         } else if (!do_sync && ceph_snap(inode) != CEPH_NOSNAP &&
 455                    (ci->i_snap_caps & wanted) == wanted) {
 456                 __ceph_touch_fmode(ci, mdsc, fmode);
 457                 spin_unlock(&ci->i_ceph_lock);
 458                 return ceph_init_file(inode, file, fmode);
 459         }
 460
 461         spin_unlock(&ci->i_ceph_lock);
 462
 463         doutc(cl, "open fmode %d wants %s\n", fmode, ceph_cap_string(wanted));
 464         req = prepare_open_request(inode->i_sb, flags, 0);
 465         if (IS_ERR(req)) {
 466                 err = PTR_ERR(req);
 467                 goto out;
 468         }
 469         req->r_inode = inode;
 470         ihold(inode);
 471
 472         req->r_num_caps = 1;
 473         err = ceph_mdsc_do_request(mdsc, NULL, req);
 474         if (!err)
 475                 err = ceph_init_file(inode, file, req->r_fmode);
 476         ceph_mdsc_put_request(req);
 477         doutc(cl, "open result=%d on %llx.%llx\n", err, ceph_vinop(inode));
 478 out:
 479         return err;
 480 }
 481
 482 /* Clone the layout from a synchronous create, if the dir now has Dc caps */
 483 static void
 484 cache_file_layout(struct inode *dst, struct inode *src)
 485 {
 486         struct ceph_inode_info *cdst = ceph_inode(dst);
 487         struct ceph_inode_info *csrc = ceph_inode(src);
 488
 489         spin_lock(&cdst->i_ceph_lock);
 490         if ((__ceph_caps_issued(cdst, NULL) & CEPH_CAP_DIR_CREATE) &&
 491             !ceph_file_layout_is_valid(&cdst->i_cached_layout)) {
 492                 memcpy(&cdst->i_cached_layout, &csrc->i_layout,
 493                         sizeof(cdst->i_cached_layout));
 494                 rcu_assign_pointer(cdst->i_cached_layout.pool_ns,
 495                                    ceph_try_get_string(csrc->i_layout.pool_ns));
 496         }
 497         spin_unlock(&cdst->i_ceph_lock);
 498 }
 499
 500 /*
 501  * Try to set up an async create. We need caps, a file layout, and inode number,
 502  * and either a lease on the dentry or complete dir info. If any of those
 503  * criteria are not satisfied, then return false and the caller can go
 504  * synchronous.
 505  */
 506 static int try_prep_async_create(struct inode *dir, struct dentry *dentry,
 507                                  struct ceph_file_layout *lo, u64 *pino)
 508 {
 509         struct ceph_inode_info *ci = ceph_inode(dir);
 510         struct ceph_dentry_info *di = ceph_dentry(dentry);
 511         int got = 0, want = CEPH_CAP_FILE_EXCL | CEPH_CAP_DIR_CREATE;
 512         u64 ino;
 513
 514         spin_lock(&ci->i_ceph_lock);
 515         /* No auth cap means no chance for Dc caps */
 516         if (!ci->i_auth_cap)
 517                 goto no_async;
 518
 519         /* Any delegated inos? */
 520         if (xa_empty(&ci->i_auth_cap->session->s_delegated_inos))
 521                 goto no_async;
 522
 523         if (!ceph_file_layout_is_valid(&ci->i_cached_layout))
 524                 goto no_async;
 525
 526         if ((__ceph_caps_issued(ci, NULL) & want) != want)
 527                 goto no_async;
 528
 529         if (d_in_lookup(dentry)) {
 530                 if (!__ceph_dir_is_complete(ci))
 531                         goto no_async;
 532                 spin_lock(&dentry->d_lock);
 533                 di->lease_shared_gen = atomic_read(&ci->i_shared_gen);
 534                 spin_unlock(&dentry->d_lock);
 535         } else if (atomic_read(&ci->i_shared_gen) !=
 536                    READ_ONCE(di->lease_shared_gen)) {
 537                 goto no_async;
 538         }
 539
 540         ino = ceph_get_deleg_ino(ci->i_auth_cap->session);
 541         if (!ino)
 542                 goto no_async;
 543
 544         *pino = ino;
 545         ceph_take_cap_refs(ci, want, false);
 546         memcpy(lo, &ci->i_cached_layout, sizeof(*lo));
 547         rcu_assign_pointer(lo->pool_ns,
 548                            ceph_try_get_string(ci->i_cached_layout.pool_ns));
 549         got = want;
 550 no_async:
 551         spin_unlock(&ci->i_ceph_lock);
 552         return got;
 553 }
 554
 555 static void restore_deleg_ino(struct inode *dir, u64 ino)
 556 {
 557         struct ceph_client *cl = ceph_inode_to_client(dir);
 558         struct ceph_inode_info *ci = ceph_inode(dir);
 559         struct ceph_mds_session *s = NULL;
 560
 561         spin_lock(&ci->i_ceph_lock);
 562         if (ci->i_auth_cap)
 563                 s = ceph_get_mds_session(ci->i_auth_cap->session);
 564         spin_unlock(&ci->i_ceph_lock);
 565         if (s) {
 566                 int err = ceph_restore_deleg_ino(s, ino);
 567                 if (err)
 568                         pr_warn_client(cl,
 569                                 "unable to restore delegated ino 0x%llx to session: %d\n",
 570                                 ino, err);
 571                 ceph_put_mds_session(s);
 572         }
 573 }
 574
 575 static void wake_async_create_waiters(struct inode *inode,
 576                                       struct ceph_mds_session *session)
 577 {
 578         struct ceph_inode_info *ci = ceph_inode(inode);
 579         bool check_cap = false;
 580
 581         spin_lock(&ci->i_ceph_lock);
 582         if (ci->i_ceph_flags & CEPH_I_ASYNC_CREATE) {
 583                 ci->i_ceph_flags &= ~CEPH_I_ASYNC_CREATE;
 584                 wake_up_bit(&ci->i_ceph_flags, CEPH_ASYNC_CREATE_BIT);
 585
 586                 if (ci->i_ceph_flags & CEPH_I_ASYNC_CHECK_CAPS) {
 587                         ci->i_ceph_flags &= ~CEPH_I_ASYNC_CHECK_CAPS;
 588                         check_cap = true;
 589                 }
 590         }
 591         ceph_kick_flushing_inode_caps(session, ci);
 592         spin_unlock(&ci->i_ceph_lock);
 593
 594         if (check_cap)
 595                 ceph_check_caps(ci, CHECK_CAPS_FLUSH);
 596 }
 597
 598 static void ceph_async_create_cb(struct ceph_mds_client *mdsc,
 599                                  struct ceph_mds_request *req)
 600 {
 601         struct ceph_client *cl = mdsc->fsc->client;
 602         struct dentry *dentry = req->r_dentry;
 603         struct inode *dinode = d_inode(dentry);
 604         struct inode *tinode = req->r_target_inode;
 605         int result = req->r_err ? req->r_err :
 606                         le32_to_cpu(req->r_reply_info.head->result);
 607
 608         WARN_ON_ONCE(dinode && tinode && dinode != tinode);
 609
 610         /* MDS changed -- caller must resubmit */
 611         if (result == -EJUKEBOX)
 612                 goto out;
 613
 614         mapping_set_error(req->r_parent->i_mapping, result);
 615
 616         if (result) {
 617                 int pathlen = 0;
 618                 u64 base = 0;
 619                 char *path = ceph_mdsc_build_path(mdsc, req->r_dentry, &pathlen,
 620                                                   &base, 0);
 621
 622                 pr_warn_client(cl,
 623                         "async create failure path=(%llx)%s result=%d!\n",
 624                         base, IS_ERR(path) ? "<<bad>>" : path, result);
 625                 ceph_mdsc_free_path(path, pathlen);
 626
 627                 ceph_dir_clear_complete(req->r_parent);
 628                 if (!d_unhashed(dentry))
 629                         d_drop(dentry);
 630
 631                 if (dinode) {
 632                         mapping_set_error(dinode->i_mapping, result);
 633                         ceph_inode_shutdown(dinode);
 634                         wake_async_create_waiters(dinode, req->r_session);
 635                 }
 636         }
 637
 638         if (tinode) {
 639                 u64 ino = ceph_vino(tinode).ino;
 640
 641                 if (req->r_deleg_ino != ino)
 642                         pr_warn_client(cl,
 643                                 "inode number mismatch! err=%d deleg_ino=0x%llx target=0x%llx\n",
 644                                 req->r_err, req->r_deleg_ino, ino);
 645
 646                 mapping_set_error(tinode->i_mapping, result);
 647                 wake_async_create_waiters(tinode, req->r_session);
 648         } else if (!result) {
 649                 pr_warn_client(cl, "no req->r_target_inode for 0x%llx\n",
 650                                req->r_deleg_ino);
 651         }
 652 out:
 653         ceph_mdsc_release_dir_caps(req);
 654 }
 655
 656 static int ceph_finish_async_create(struct inode *dir, struct inode *inode,
 657                                     struct dentry *dentry,
 658                                     struct file *file, umode_t mode,
 659                                     struct ceph_mds_request *req,
 660                                     struct ceph_acl_sec_ctx *as_ctx,
 661                                     struct ceph_file_layout *lo)
 662 {
 663         int ret;
 664         char xattr_buf[4];
 665         struct ceph_mds_reply_inode in = { };
 666         struct ceph_mds_reply_info_in iinfo = { .in = &in };
 667         struct ceph_inode_info *ci = ceph_inode(dir);
 668         struct ceph_dentry_info *di = ceph_dentry(dentry);
 669         struct timespec64 now;
 670         struct ceph_string *pool_ns;
 671         struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb);
 672         struct ceph_client *cl = mdsc->fsc->client;
 673         struct ceph_vino vino = { .ino = req->r_deleg_ino,
 674                                   .snap = CEPH_NOSNAP };
 675
 676         ktime_get_real_ts64(&now);
 677
 678         iinfo.inline_version = CEPH_INLINE_NONE;
 679         iinfo.change_attr = 1;
 680         ceph_encode_timespec64(&iinfo.btime, &now);
 681
 682         if (req->r_pagelist) {
 683                 iinfo.xattr_len = req->r_pagelist->length;
 684                 iinfo.xattr_data = req->r_pagelist->mapped_tail;
 685         } else {
 686                 /* fake it */
 687                 iinfo.xattr_len = ARRAY_SIZE(xattr_buf);
 688                 iinfo.xattr_data = xattr_buf;
 689                 memset(iinfo.xattr_data, 0, iinfo.xattr_len);
 690         }
 691
 692         in.ino = cpu_to_le64(vino.ino);
 693         in.snapid = cpu_to_le64(CEPH_NOSNAP);
 694         in.version = cpu_to_le64(1);    // ???
 695         in.cap.caps = in.cap.wanted = cpu_to_le32(CEPH_CAP_ALL_FILE);
 696         in.cap.cap_id = cpu_to_le64(1);
 697         in.cap.realm = cpu_to_le64(ci->i_snap_realm->ino);
 698         in.cap.flags = CEPH_CAP_FLAG_AUTH;
 699         in.ctime = in.mtime = in.atime = iinfo.btime;
 700         in.truncate_seq = cpu_to_le32(1);
 701         in.truncate_size = cpu_to_le64(-1ULL);
 702         in.xattr_version = cpu_to_le64(1);
 703         in.uid = cpu_to_le32(from_kuid(&init_user_ns,
 704                                        mapped_fsuid(req->r_mnt_idmap,
 705                                                     &init_user_ns)));
 706         if (dir->i_mode & S_ISGID) {
 707                 in.gid = cpu_to_le32(from_kgid(&init_user_ns, dir->i_gid));
 708
 709                 /* Directories always inherit the setgid bit. */
 710                 if (S_ISDIR(mode))
 711                         mode |= S_ISGID;
 712         } else {
 713                 in.gid = cpu_to_le32(from_kgid(&init_user_ns,
 714                                      mapped_fsgid(req->r_mnt_idmap,
 715                                                   &init_user_ns)));
 716         }
 717         in.mode = cpu_to_le32((u32)mode);
 718
 719         in.nlink = cpu_to_le32(1);
 720         in.max_size = cpu_to_le64(lo->stripe_unit);
 721
 722         ceph_file_layout_to_legacy(lo, &in.layout);
 723         /* lo is private, so pool_ns can't change */
 724         pool_ns = rcu_dereference_raw(lo->pool_ns);
 725         if (pool_ns) {
 726                 iinfo.pool_ns_len = pool_ns->len;
 727                 iinfo.pool_ns_data = pool_ns->str;
 728         }
 729
 730         down_read(&mdsc->snap_rwsem);
 731         ret = ceph_fill_inode(inode, NULL, &iinfo, NULL, req->r_session,
 732                               req->r_fmode, NULL);
 733         up_read(&mdsc->snap_rwsem);
 734         if (ret) {
 735                 doutc(cl, "failed to fill inode: %d\n", ret);
 736                 ceph_dir_clear_complete(dir);
 737                 if (!d_unhashed(dentry))
 738                         d_drop(dentry);
 739                 discard_new_inode(inode);
 740         } else {
 741                 struct dentry *dn;
 742
 743                 doutc(cl, "d_adding new inode 0x%llx to 0x%llx/%s\n",
 744                       vino.ino, ceph_ino(dir), dentry->d_name.name);
 745                 ceph_dir_clear_ordered(dir);
 746                 ceph_init_inode_acls(inode, as_ctx);
 747                 if (inode->i_state & I_NEW) {
 748                         /*
 749                          * If it's not I_NEW, then someone created this before
 750                          * we got here. Assume the server is aware of it at
 751                          * that point and don't worry about setting
 752                          * CEPH_I_ASYNC_CREATE.
 753                          */
 754                         ceph_inode(inode)->i_ceph_flags = CEPH_I_ASYNC_CREATE;
 755                         unlock_new_inode(inode);
 756                 }
 757                 if (d_in_lookup(dentry) || d_really_is_negative(dentry)) {
 758                         if (!d_unhashed(dentry))
 759                                 d_drop(dentry);
 760                         dn = d_splice_alias(inode, dentry);
 761                         WARN_ON_ONCE(dn && dn != dentry);
 762                 }
 763                 file->f_mode |= FMODE_CREATED;
 764                 ret = finish_open(file, dentry, ceph_open);
 765         }
 766
 767         spin_lock(&dentry->d_lock);
 768         di->flags &= ~CEPH_DENTRY_ASYNC_CREATE;
 769         wake_up_bit(&di->flags, CEPH_DENTRY_ASYNC_CREATE_BIT);
 770         spin_unlock(&dentry->d_lock);
 771
 772         return ret;
 773 }
 774
 775 /*
 776  * Do a lookup + open with a single request.  If we get a non-existent
 777  * file or symlink, return 1 so the VFS can retry.
 778  */
 779 int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
 780                      struct file *file, unsigned flags, umode_t mode)
 781 {
 782         struct mnt_idmap *idmap = file_mnt_idmap(file);
 783         struct ceph_fs_client *fsc = ceph_sb_to_fs_client(dir->i_sb);
 784         struct ceph_client *cl = fsc->client;
 785         struct ceph_mds_client *mdsc = fsc->mdsc;
 786         struct ceph_mds_request *req;
 787         struct inode *new_inode = NULL;
 788         struct dentry *dn;
 789         struct ceph_acl_sec_ctx as_ctx = {};
 790         bool try_async = ceph_test_mount_opt(fsc, ASYNC_DIROPS);
 791         int mask;
 792         int err;
 793         char *path;
 794         int pathlen;
 795         u64 pathbase;
 796
 797         doutc(cl, "%p %llx.%llx dentry %p '%pd' %s flags %d mode 0%o\n",
 798               dir, ceph_vinop(dir), dentry, dentry,
 799               d_unhashed(dentry) ? "unhashed" : "hashed", flags, mode);
 800
 801         if (dentry->d_name.len > NAME_MAX)
 802                 return -ENAMETOOLONG;
 803
 804         err = ceph_wait_on_conflict_unlink(dentry);
 805         if (err)
 806                 return err;
 807         /*
 808          * Do not truncate the file, since atomic_open is called before the
 809          * permission check. The caller will do the truncation afterward.
 810          */
 811         flags &= ~O_TRUNC;
 812
 813         dn = d_find_alias(dir);
 814         if (!dn) {
 815                 try_async = false;
 816         } else {
 817                 path = ceph_mdsc_build_path(mdsc, dn, &pathlen, &pathbase, 0);
 818                 if (IS_ERR(path)) {
 819                         try_async = false;
 820                         err = 0;
 821                 } else {
 822                         int fmode = ceph_flags_to_mode(flags);
 823
 824                         mask = MAY_READ;
 825                         if (fmode & CEPH_FILE_MODE_WR)
 826                                 mask |= MAY_WRITE;
 827                         err = ceph_mds_check_access(mdsc, path, mask);
 828                 }
 829                 ceph_mdsc_free_path(path, pathlen);
 830                 dput(dn);
 831
 832                 /* For none EACCES cases will let the MDS do the mds auth check */
 833                 if (err == -EACCES) {
 834                         return err;
 835                 } else if (err < 0) {
 836                         try_async = false;
 837                         err = 0;
 838                 }
 839         }
 840
 841 retry:
 842         if (flags & O_CREAT) {
 843                 if (ceph_quota_is_max_files_exceeded(dir))
 844                         return -EDQUOT;
 845
 846                 new_inode = ceph_new_inode(dir, dentry, &mode, &as_ctx);
 847                 if (IS_ERR(new_inode)) {
 848                         err = PTR_ERR(new_inode);
 849                         goto out_ctx;
 850                 }
 851                 /* Async create can't handle more than a page of xattrs */
 852                 if (as_ctx.pagelist &&
 853                     !list_is_singular(&as_ctx.pagelist->head))
 854                         try_async = false;
 855         } else if (!d_in_lookup(dentry)) {
 856                 /* If it's not being looked up, it's negative */
 857                 return -ENOENT;
 858         }
 859
 860         /* do the open */
 861         req = prepare_open_request(dir->i_sb, flags, mode);
 862         if (IS_ERR(req)) {
 863                 err = PTR_ERR(req);
 864                 goto out_ctx;
 865         }
 866         req->r_dentry = dget(dentry);
 867         req->r_num_caps = 2;
 868         mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
 869         if (ceph_security_xattr_wanted(dir))
 870                 mask |= CEPH_CAP_XATTR_SHARED;
 871         req->r_args.open.mask = cpu_to_le32(mask);
 872         req->r_parent = dir;
 873         if (req->r_op == CEPH_MDS_OP_CREATE)
 874                 req->r_mnt_idmap = mnt_idmap_get(idmap);
 875         ihold(dir);
 876         if (IS_ENCRYPTED(dir)) {
 877                 set_bit(CEPH_MDS_R_FSCRYPT_FILE, &req->r_req_flags);
 878                 err = fscrypt_prepare_lookup_partial(dir, dentry);
 879                 if (err < 0)
 880                         goto out_req;
 881         }
 882
 883         if (flags & O_CREAT) {
 884                 struct ceph_file_layout lo;
 885
 886                 req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL |
 887                                      CEPH_CAP_XATTR_EXCL;
 888                 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
 889
 890                 ceph_as_ctx_to_req(req, &as_ctx);
 891
 892                 if (try_async && (req->r_dir_caps =
 893                                   try_prep_async_create(dir, dentry, &lo,
 894                                                         &req->r_deleg_ino))) {
 895                         struct ceph_vino vino = { .ino = req->r_deleg_ino,
 896                                                   .snap = CEPH_NOSNAP };
 897                         struct ceph_dentry_info *di = ceph_dentry(dentry);
 898
 899                         set_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags);
 900                         req->r_args.open.flags |= cpu_to_le32(CEPH_O_EXCL);
 901                         req->r_callback = ceph_async_create_cb;
 902
 903                         /* Hash inode before RPC */
 904                         new_inode = ceph_get_inode(dir->i_sb, vino, new_inode);
 905                         if (IS_ERR(new_inode)) {
 906                                 err = PTR_ERR(new_inode);
 907                                 new_inode = NULL;
 908                                 goto out_req;
 909                         }
 910                         WARN_ON_ONCE(!(new_inode->i_state & I_NEW));
 911
 912                         spin_lock(&dentry->d_lock);
 913                         di->flags |= CEPH_DENTRY_ASYNC_CREATE;
 914                         spin_unlock(&dentry->d_lock);
 915
 916                         err = ceph_mdsc_submit_request(mdsc, dir, req);
 917                         if (!err) {
 918                                 err = ceph_finish_async_create(dir, new_inode,
 919                                                                dentry, file,
 920                                                                mode, req,
 921                                                                &as_ctx, &lo);
 922                                 new_inode = NULL;
 923                         } else if (err == -EJUKEBOX) {
 924                                 restore_deleg_ino(dir, req->r_deleg_ino);
 925                                 ceph_mdsc_put_request(req);
 926                                 discard_new_inode(new_inode);
 927                                 ceph_release_acl_sec_ctx(&as_ctx);
 928                                 memset(&as_ctx, 0, sizeof(as_ctx));
 929                                 new_inode = NULL;
 930                                 try_async = false;
 931                                 ceph_put_string(rcu_dereference_raw(lo.pool_ns));
 932                                 goto retry;
 933                         }
 934                         ceph_put_string(rcu_dereference_raw(lo.pool_ns));
 935                         goto out_req;
 936                 }
 937         }
 938
 939         set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
 940         req->r_new_inode = new_inode;
 941         new_inode = NULL;
 942         err = ceph_mdsc_do_request(mdsc, (flags & O_CREAT) ? dir : NULL, req);
 943         if (err == -ENOENT) {
 944                 dentry = ceph_handle_snapdir(req, dentry);
 945                 if (IS_ERR(dentry)) {
 946                         err = PTR_ERR(dentry);
 947                         goto out_req;
 948                 }
 949                 err = 0;
 950         }
 951
 952         if (!err && (flags & O_CREAT) && !req->r_reply_info.head->is_dentry)
 953                 err = ceph_handle_notrace_create(dir, dentry);
 954
 955         if (d_in_lookup(dentry)) {
 956                 dn = ceph_finish_lookup(req, dentry, err);
 957                 if (IS_ERR(dn))
 958                         err = PTR_ERR(dn);
 959         } else {
 960                 /* we were given a hashed negative dentry */
 961                 dn = NULL;
 962         }
 963         if (err)
 964                 goto out_req;
 965         if (dn || d_really_is_negative(dentry) || d_is_symlink(dentry)) {
 966                 /* make vfs retry on splice, ENOENT, or symlink */
 967                 doutc(cl, "finish_no_open on dn %p\n", dn);
 968                 err = finish_no_open(file, dn);
 969         } else {
 970                 if (IS_ENCRYPTED(dir) &&
 971                     !fscrypt_has_permitted_context(dir, d_inode(dentry))) {
 972                         pr_warn_client(cl,
 973                                 "Inconsistent encryption context (parent %llx:%llx child %llx:%llx)\n",
 974                                 ceph_vinop(dir), ceph_vinop(d_inode(dentry)));
 975                         goto out_req;
 976                 }
 977
 978                 doutc(cl, "finish_open on dn %p\n", dn);
 979                 if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) {
 980                         struct inode *newino = d_inode(dentry);
 981
 982                         cache_file_layout(dir, newino);
 983                         ceph_init_inode_acls(newino, &as_ctx);
 984                         file->f_mode |= FMODE_CREATED;
 985                 }
 986                 err = finish_open(file, dentry, ceph_open);
 987         }
 988 out_req:
 989         ceph_mdsc_put_request(req);
 990         iput(new_inode);
 991 out_ctx:
 992         ceph_release_acl_sec_ctx(&as_ctx);
 993         doutc(cl, "result=%d\n", err);
 994         return err;
 995 }
 996
 997 int ceph_release(struct inode *inode, struct file *file)
 998 {
 999         struct ceph_client *cl = ceph_inode_to_client(inode);
1000         struct ceph_inode_info *ci = ceph_inode(inode);
1001
1002         if (S_ISDIR(inode->i_mode)) {
1003                 struct ceph_dir_file_info *dfi = file->private_data;
1004                 doutc(cl, "%p %llx.%llx dir file %p\n", inode,
1005                       ceph_vinop(inode), file);
1006                 WARN_ON(!list_empty(&dfi->file_info.rw_contexts));
1007
1008                 ceph_put_fmode(ci, dfi->file_info.fmode, 1);
1009
1010                 if (dfi->last_readdir)
1011                         ceph_mdsc_put_request(dfi->last_readdir);
1012                 kfree(dfi->last_name);
1013                 kfree(dfi->dir_info);
1014                 kmem_cache_free(ceph_dir_file_cachep, dfi);
1015         } else {
1016                 struct ceph_file_info *fi = file->private_data;
1017                 doutc(cl, "%p %llx.%llx regular file %p\n", inode,
1018                       ceph_vinop(inode), file);
1019                 WARN_ON(!list_empty(&fi->rw_contexts));
1020
1021                 ceph_fscache_unuse_cookie(inode, file->f_mode & FMODE_WRITE);
1022                 ceph_put_fmode(ci, fi->fmode, 1);
1023
1024                 kmem_cache_free(ceph_file_cachep, fi);
1025         }
1026
1027         /* wake up anyone waiting for caps on this inode */
1028         wake_up_all(&ci->i_cap_wq);
1029         return 0;
1030 }
1031
1032 enum {
1033         HAVE_RETRIED = 1,
1034         CHECK_EOF =    2,
1035         READ_INLINE =  3,
1036 };
1037
1038 /*
1039  * Completely synchronous read and write methods.  Direct from __user
1040  * buffer to osd, or directly to user pages (if O_DIRECT).
1041  *
1042  * If the read spans object boundary, just do multiple reads.  (That's not
1043  * atomic, but good enough for now.)
1044  *
1045  * If we get a short result from the OSD, check against i_size; we need to
1046  * only return a short read to the caller if we hit EOF.
1047  */
1048 ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos,
1049                          struct iov_iter *to, int *retry_op,
1050                          u64 *last_objver)
1051 {
1052         struct ceph_inode_info *ci = ceph_inode(inode);
1053         struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
1054         struct ceph_client *cl = fsc->client;
1055         struct ceph_osd_client *osdc = &fsc->client->osdc;
1056         ssize_t ret;
1057         u64 off = *ki_pos;
1058         u64 len = iov_iter_count(to);
1059         u64 i_size = i_size_read(inode);
1060         bool sparse = IS_ENCRYPTED(inode) || ceph_test_mount_opt(fsc, SPARSEREAD);
1061         u64 objver = 0;
1062
1063         doutc(cl, "on inode %p %llx.%llx %llx~%llx\n", inode,
1064               ceph_vinop(inode), *ki_pos, len);
1065
1066         if (ceph_inode_is_shutdown(inode))
1067                 return -EIO;
1068
1069         if (!len)
1070                 return 0;
1071         /*
1072          * flush any page cache pages in this range.  this
1073          * will make concurrent normal and sync io slow,
1074          * but it will at least behave sensibly when they are
1075          * in sequence.
1076          */
1077         ret = filemap_write_and_wait_range(inode->i_mapping,
1078                                            off, off + len - 1);
1079         if (ret < 0)
1080                 return ret;
1081
1082         ret = 0;
1083         while ((len = iov_iter_count(to)) > 0) {
1084                 struct ceph_osd_request *req;
1085                 struct page **pages;
1086                 int num_pages;
1087                 size_t page_off;
1088                 bool more;
1089                 int idx;
1090                 size_t left;
1091                 struct ceph_osd_req_op *op;
1092                 u64 read_off = off;
1093                 u64 read_len = len;
1094                 int extent_cnt;
1095
1096                 /* determine new offset/length if encrypted */
1097                 ceph_fscrypt_adjust_off_and_len(inode, &read_off, &read_len);
1098
1099                 doutc(cl, "orig %llu~%llu reading %llu~%llu", off, len,
1100                       read_off, read_len);
1101
1102                 req = ceph_osdc_new_request(osdc, &ci->i_layout,
1103                                         ci->i_vino, read_off, &read_len, 0, 1,
1104                                         sparse ? CEPH_OSD_OP_SPARSE_READ :
1105                                                  CEPH_OSD_OP_READ,
1106                                         CEPH_OSD_FLAG_READ,
1107                                         NULL, ci->i_truncate_seq,
1108                                         ci->i_truncate_size, false);
1109                 if (IS_ERR(req)) {
1110                         ret = PTR_ERR(req);
1111                         break;
1112                 }
1113
1114                 /* adjust len downward if the request truncated the len */
1115                 if (off + len > read_off + read_len)
1116                         len = read_off + read_len - off;
1117                 more = len < iov_iter_count(to);
1118
1119                 num_pages = calc_pages_for(read_off, read_len);
1120                 page_off = offset_in_page(off);
1121                 pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
1122                 if (IS_ERR(pages)) {
1123                         ceph_osdc_put_request(req);
1124                         ret = PTR_ERR(pages);
1125                         break;
1126                 }
1127
1128                 osd_req_op_extent_osd_data_pages(req, 0, pages, read_len,
1129                                                  offset_in_page(read_off),
1130                                                  false, false);
1131
1132                 op = &req->r_ops[0];
1133                 if (sparse) {
1134                         extent_cnt = __ceph_sparse_read_ext_count(inode, read_len);
1135                         ret = ceph_alloc_sparse_ext_map(op, extent_cnt);
1136                         if (ret) {
1137                                 ceph_osdc_put_request(req);
1138                                 break;
1139                         }
1140                 }
1141
1142                 ceph_osdc_start_request(osdc, req);
1143                 ret = ceph_osdc_wait_request(osdc, req);
1144
1145                 ceph_update_read_metrics(&fsc->mdsc->metric,
1146                                          req->r_start_latency,
1147                                          req->r_end_latency,
1148                                          read_len, ret);
1149
1150                 if (ret > 0)
1151                         objver = req->r_version;
1152
1153                 i_size = i_size_read(inode);
1154                 doutc(cl, "%llu~%llu got %zd i_size %llu%s\n", off, len,
1155                       ret, i_size, (more ? " MORE" : ""));
1156
1157                 /* Fix it to go to end of extent map */
1158                 if (sparse && ret >= 0)
1159                         ret = ceph_sparse_ext_map_end(op);
1160                 else if (ret == -ENOENT)
1161                         ret = 0;
1162
1163                 if (ret > 0 && IS_ENCRYPTED(inode)) {
1164                         int fret;
1165
1166                         fret = ceph_fscrypt_decrypt_extents(inode, pages,
1167                                         read_off, op->extent.sparse_ext,
1168                                         op->extent.sparse_ext_cnt);
1169                         if (fret < 0) {
1170                                 ret = fret;
1171                                 ceph_osdc_put_request(req);
1172                                 break;
1173                         }
1174
1175                         /* account for any partial block at the beginning */
1176                         fret -= (off - read_off);
1177
1178                         /*
1179                          * Short read after big offset adjustment?
1180                          * Nothing is usable, just call it a zero
1181                          * len read.
1182                          */
1183                         fret = max(fret, 0);
1184
1185                         /* account for partial block at the end */
1186                         ret = min_t(ssize_t, fret, len);
1187                 }
1188
1189                 ceph_osdc_put_request(req);
1190
1191                 /* Short read but not EOF? Zero out the remainder. */
1192                 if (ret >= 0 && ret < len && (off + ret < i_size)) {
1193                         int zlen = min(len - ret, i_size - off - ret);
1194                         int zoff = page_off + ret;
1195
1196                         doutc(cl, "zero gap %llu~%llu\n", off + ret,
1197                               off + ret + zlen);
1198                         ceph_zero_page_vector_range(zoff, zlen, pages);
1199                         ret += zlen;
1200                 }
1201
1202                 idx = 0;
1203                 if (ret <= 0)
1204                         left = 0;
1205                 else if (off + ret > i_size)
1206                         left = i_size - off;
1207                 else
1208                         left = ret;
1209                 while (left > 0) {
1210                         size_t plen, copied;
1211
1212                         plen = min_t(size_t, left, PAGE_SIZE - page_off);
1213                         SetPageUptodate(pages[idx]);
1214                         copied = copy_page_to_iter(pages[idx++],
1215                                                    page_off, plen, to);
1216                         off += copied;
1217                         left -= copied;
1218                         page_off = 0;
1219                         if (copied < plen) {
1220                                 ret = -EFAULT;
1221                                 break;
1222                         }
1223                 }
1224                 ceph_release_page_vector(pages, num_pages);
1225
1226                 if (ret < 0) {
1227                         if (ret == -EBLOCKLISTED)
1228                                 fsc->blocklisted = true;
1229                         break;
1230                 }
1231
1232                 if (off >= i_size || !more)
1233                         break;
1234         }
1235
1236         if (ret > 0) {
1237                 if (off >= i_size) {
1238                         *retry_op = CHECK_EOF;
1239                         ret = i_size - *ki_pos;
1240                         *ki_pos = i_size;
1241                 } else {
1242                         ret = off - *ki_pos;
1243                         *ki_pos = off;
1244                 }
1245
1246                 if (last_objver)
1247                         *last_objver = objver;
1248         }
1249         doutc(cl, "result %zd retry_op %d\n", ret, *retry_op);
1250         return ret;
1251 }
1252
1253 static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *to,
1254                               int *retry_op)
1255 {
1256         struct file *file = iocb->ki_filp;
1257         struct inode *inode = file_inode(file);
1258         struct ceph_client *cl = ceph_inode_to_client(inode);
1259
1260         doutc(cl, "on file %p %llx~%zx %s\n", file, iocb->ki_pos,
1261               iov_iter_count(to),
1262               (file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
1263
1264         return __ceph_sync_read(inode, &iocb->ki_pos, to, retry_op, NULL);
1265 }
1266
1267 struct ceph_aio_request {
1268         struct kiocb *iocb;
1269         size_t total_len;
1270         bool write;
1271         bool should_dirty;
1272         int error;
1273         struct list_head osd_reqs;
1274         unsigned num_reqs;
1275         atomic_t pending_reqs;
1276         struct timespec64 mtime;
1277         struct ceph_cap_flush *prealloc_cf;
1278 };
1279
1280 struct ceph_aio_work {
1281         struct work_struct work;
1282         struct ceph_osd_request *req;
1283 };
1284
1285 static void ceph_aio_retry_work(struct work_struct *work);
1286
1287 static void ceph_aio_complete(struct inode *inode,
1288                               struct ceph_aio_request *aio_req)
1289 {
1290         struct ceph_client *cl = ceph_inode_to_client(inode);
1291         struct ceph_inode_info *ci = ceph_inode(inode);
1292         int ret;
1293
1294         if (!atomic_dec_and_test(&aio_req->pending_reqs))
1295                 return;
1296
1297         if (aio_req->iocb->ki_flags & IOCB_DIRECT)
1298                 inode_dio_end(inode);
1299
1300         ret = aio_req->error;
1301         if (!ret)
1302                 ret = aio_req->total_len;
1303
1304         doutc(cl, "%p %llx.%llx rc %d\n", inode, ceph_vinop(inode), ret);
1305
1306         if (ret >= 0 && aio_req->write) {
1307                 int dirty;
1308
1309                 loff_t endoff = aio_req->iocb->ki_pos + aio_req->total_len;
1310                 if (endoff > i_size_read(inode)) {
1311                         if (ceph_inode_set_size(inode, endoff))
1312                                 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY);
1313                 }
1314
1315                 spin_lock(&ci->i_ceph_lock);
1316                 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1317                                                &aio_req->prealloc_cf);
1318                 spin_unlock(&ci->i_ceph_lock);
1319                 if (dirty)
1320                         __mark_inode_dirty(inode, dirty);
1321
1322         }
1323
1324         ceph_put_cap_refs(ci, (aio_req->write ? CEPH_CAP_FILE_WR :
1325                                                 CEPH_CAP_FILE_RD));
1326
1327         aio_req->iocb->ki_complete(aio_req->iocb, ret);
1328
1329         ceph_free_cap_flush(aio_req->prealloc_cf);
1330         kfree(aio_req);
1331 }
1332
1333 static void ceph_aio_complete_req(struct ceph_osd_request *req)
1334 {
1335         int rc = req->r_result;
1336         struct inode *inode = req->r_inode;
1337         struct ceph_aio_request *aio_req = req->r_priv;
1338         struct ceph_osd_data *osd_data = osd_req_op_extent_osd_data(req, 0);
1339         struct ceph_osd_req_op *op = &req->r_ops[0];
1340         struct ceph_client_metric *metric = &ceph_sb_to_mdsc(inode->i_sb)->metric;
1341         unsigned int len = osd_data->bvec_pos.iter.bi_size;
1342         bool sparse = (op->op == CEPH_OSD_OP_SPARSE_READ);
1343         struct ceph_client *cl = ceph_inode_to_client(inode);
1344
1345         BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_BVECS);
1346         BUG_ON(!osd_data->num_bvecs);
1347
1348         doutc(cl, "req %p inode %p %llx.%llx, rc %d bytes %u\n", req,
1349               inode, ceph_vinop(inode), rc, len);
1350
1351         if (rc == -EOLDSNAPC) {
1352                 struct ceph_aio_work *aio_work;
1353                 BUG_ON(!aio_req->write);
1354
1355                 aio_work = kmalloc(sizeof(*aio_work), GFP_NOFS);
1356                 if (aio_work) {
1357                         INIT_WORK(&aio_work->work, ceph_aio_retry_work);
1358                         aio_work->req = req;
1359                         queue_work(ceph_inode_to_fs_client(inode)->inode_wq,
1360                                    &aio_work->work);
1361                         return;
1362                 }
1363                 rc = -ENOMEM;
1364         } else if (!aio_req->write) {
1365                 if (sparse && rc >= 0)
1366                         rc = ceph_sparse_ext_map_end(op);
1367                 if (rc == -ENOENT)
1368                         rc = 0;
1369                 if (rc >= 0 && len > rc) {
1370                         struct iov_iter i;
1371                         int zlen = len - rc;
1372
1373                         /*
1374                          * If read is satisfied by single OSD request,
1375                          * it can pass EOF. Otherwise read is within
1376                          * i_size.
1377                          */
1378                         if (aio_req->num_reqs == 1) {
1379                                 loff_t i_size = i_size_read(inode);
1380                                 loff_t endoff = aio_req->iocb->ki_pos + rc;
1381                                 if (endoff < i_size)
1382                                         zlen = min_t(size_t, zlen,
1383                                                      i_size - endoff);
1384                                 aio_req->total_len = rc + zlen;
1385                         }
1386
1387                         iov_iter_bvec(&i, ITER_DEST, osd_data->bvec_pos.bvecs,
1388                                       osd_data->num_bvecs, len);
1389                         iov_iter_advance(&i, rc);
1390                         iov_iter_zero(zlen, &i);
1391                 }
1392         }
1393
1394         /* r_start_latency == 0 means the request was not submitted */
1395         if (req->r_start_latency) {
1396                 if (aio_req->write)
1397                         ceph_update_write_metrics(metric, req->r_start_latency,
1398                                                   req->r_end_latency, len, rc);
1399                 else
1400                         ceph_update_read_metrics(metric, req->r_start_latency,
1401                                                  req->r_end_latency, len, rc);
1402         }
1403
1404         put_bvecs(osd_data->bvec_pos.bvecs, osd_data->num_bvecs,
1405                   aio_req->should_dirty);
1406         ceph_osdc_put_request(req);
1407
1408         if (rc < 0)
1409                 cmpxchg(&aio_req->error, 0, rc);
1410
1411         ceph_aio_complete(inode, aio_req);
1412         return;
1413 }
1414
1415 static void ceph_aio_retry_work(struct work_struct *work)
1416 {
1417         struct ceph_aio_work *aio_work =
1418                 container_of(work, struct ceph_aio_work, work);
1419         struct ceph_osd_request *orig_req = aio_work->req;
1420         struct ceph_aio_request *aio_req = orig_req->r_priv;
1421         struct inode *inode = orig_req->r_inode;
1422         struct ceph_inode_info *ci = ceph_inode(inode);
1423         struct ceph_snap_context *snapc;
1424         struct ceph_osd_request *req;
1425         int ret;
1426
1427         spin_lock(&ci->i_ceph_lock);
1428         if (__ceph_have_pending_cap_snap(ci)) {
1429                 struct ceph_cap_snap *capsnap =
1430                         list_last_entry(&ci->i_cap_snaps,
1431                                         struct ceph_cap_snap,
1432                                         ci_item);
1433                 snapc = ceph_get_snap_context(capsnap->context);
1434         } else {
1435                 BUG_ON(!ci->i_head_snapc);
1436                 snapc = ceph_get_snap_context(ci->i_head_snapc);
1437         }
1438         spin_unlock(&ci->i_ceph_lock);
1439
1440         req = ceph_osdc_alloc_request(orig_req->r_osdc, snapc, 1,
1441                         false, GFP_NOFS);
1442         if (!req) {
1443                 ret = -ENOMEM;
1444                 req = orig_req;
1445                 goto out;
1446         }
1447
1448         req->r_flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE;
1449         ceph_oloc_copy(&req->r_base_oloc, &orig_req->r_base_oloc);
1450         ceph_oid_copy(&req->r_base_oid, &orig_req->r_base_oid);
1451
1452         req->r_ops[0] = orig_req->r_ops[0];
1453
1454         req->r_mtime = aio_req->mtime;
1455         req->r_data_offset = req->r_ops[0].extent.offset;
1456
1457         ret = ceph_osdc_alloc_messages(req, GFP_NOFS);
1458         if (ret) {
1459                 ceph_osdc_put_request(req);
1460                 req = orig_req;
1461                 goto out;
1462         }
1463
1464         ceph_osdc_put_request(orig_req);
1465
1466         req->r_callback = ceph_aio_complete_req;
1467         req->r_inode = inode;
1468         req->r_priv = aio_req;
1469
1470         ceph_osdc_start_request(req->r_osdc, req);
1471 out:
1472         if (ret < 0) {
1473                 req->r_result = ret;
1474                 ceph_aio_complete_req(req);
1475         }
1476
1477         ceph_put_snap_context(snapc);
1478         kfree(aio_work);
1479 }
1480
1481 static ssize_t
1482 ceph_direct_read_write(struct kiocb *iocb, struct iov_iter *iter,
1483                        struct ceph_snap_context *snapc,
1484                        struct ceph_cap_flush **pcf)
1485 {
1486         struct file *file = iocb->ki_filp;
1487         struct inode *inode = file_inode(file);
1488         struct ceph_inode_info *ci = ceph_inode(inode);
1489         struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
1490         struct ceph_client *cl = fsc->client;
1491         struct ceph_client_metric *metric = &fsc->mdsc->metric;
1492         struct ceph_vino vino;
1493         struct ceph_osd_request *req;
1494         struct bio_vec *bvecs;
1495         struct ceph_aio_request *aio_req = NULL;
1496         int num_pages = 0;
1497         int flags;
1498         int ret = 0;
1499         struct timespec64 mtime = current_time(inode);
1500         size_t count = iov_iter_count(iter);
1501         loff_t pos = iocb->ki_pos;
1502         bool write = iov_iter_rw(iter) == WRITE;
1503         bool should_dirty = !write && user_backed_iter(iter);
1504         bool sparse = ceph_test_mount_opt(fsc, SPARSEREAD);
1505
1506         if (write && ceph_snap(file_inode(file)) != CEPH_NOSNAP)
1507                 return -EROFS;
1508
1509         doutc(cl, "sync_direct_%s on file %p %lld~%u snapc %p seq %lld\n",
1510               (write ? "write" : "read"), file, pos, (unsigned)count,
1511               snapc, snapc ? snapc->seq : 0);
1512
1513         if (write) {
1514                 int ret2;
1515
1516                 ceph_fscache_invalidate(inode, true);
1517
1518                 ret2 = invalidate_inode_pages2_range(inode->i_mapping,
1519                                         pos >> PAGE_SHIFT,
1520                                         (pos + count - 1) >> PAGE_SHIFT);
1521                 if (ret2 < 0)
1522                         doutc(cl, "invalidate_inode_pages2_range returned %d\n",
1523                               ret2);
1524
1525                 flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE;
1526         } else {
1527                 flags = CEPH_OSD_FLAG_READ;
1528         }
1529
1530         while (iov_iter_count(iter) > 0) {
1531                 u64 size = iov_iter_count(iter);
1532                 ssize_t len;
1533                 struct ceph_osd_req_op *op;
1534                 int readop = sparse ? CEPH_OSD_OP_SPARSE_READ : CEPH_OSD_OP_READ;
1535                 int extent_cnt;
1536
1537                 if (write)
1538                         size = min_t(u64, size, fsc->mount_options->wsize);
1539                 else
1540                         size = min_t(u64, size, fsc->mount_options->rsize);
1541
1542                 vino = ceph_vino(inode);
1543                 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1544                                             vino, pos, &size, 0,
1545                                             1,
1546                                             write ? CEPH_OSD_OP_WRITE : readop,
1547                                             flags, snapc,
1548                                             ci->i_truncate_seq,
1549                                             ci->i_truncate_size,
1550                                             false);
1551                 if (IS_ERR(req)) {
1552                         ret = PTR_ERR(req);
1553                         break;
1554                 }
1555
1556                 len = iter_get_bvecs_alloc(iter, size, &bvecs, &num_pages);
1557                 if (len < 0) {
1558                         ceph_osdc_put_request(req);
1559                         ret = len;
1560                         break;
1561                 }
1562                 if (len != size)
1563                         osd_req_op_extent_update(req, 0, len);
1564
1565                 /*
1566                  * To simplify error handling, allow AIO when IO within i_size
1567                  * or IO can be satisfied by single OSD request.
1568                  */
1569                 if (pos == iocb->ki_pos && !is_sync_kiocb(iocb) &&
1570                     (len == count || pos + count <= i_size_read(inode))) {
1571                         aio_req = kzalloc(sizeof(*aio_req), GFP_KERNEL);
1572                         if (aio_req) {
1573                                 aio_req->iocb = iocb;
1574                                 aio_req->write = write;
1575                                 aio_req->should_dirty = should_dirty;
1576                                 INIT_LIST_HEAD(&aio_req->osd_reqs);
1577                                 if (write) {
1578                                         aio_req->mtime = mtime;
1579                                         swap(aio_req->prealloc_cf, *pcf);
1580                                 }
1581                         }
1582                         /* ignore error */
1583                 }
1584
1585                 if (write) {
1586                         /*
1587                          * throw out any page cache pages in this range. this
1588                          * may block.
1589                          */
1590                         truncate_inode_pages_range(inode->i_mapping, pos,
1591                                                    PAGE_ALIGN(pos + len) - 1);
1592
1593                         req->r_mtime = mtime;
1594                 }
1595
1596                 osd_req_op_extent_osd_data_bvecs(req, 0, bvecs, num_pages, len);
1597                 op = &req->r_ops[0];
1598                 if (sparse) {
1599                         extent_cnt = __ceph_sparse_read_ext_count(inode, size);
1600                         ret = ceph_alloc_sparse_ext_map(op, extent_cnt);
1601                         if (ret) {
1602                                 ceph_osdc_put_request(req);
1603                                 break;
1604                         }
1605                 }
1606
1607                 if (aio_req) {
1608                         aio_req->total_len += len;
1609                         aio_req->num_reqs++;
1610                         atomic_inc(&aio_req->pending_reqs);
1611
1612                         req->r_callback = ceph_aio_complete_req;
1613                         req->r_inode = inode;
1614                         req->r_priv = aio_req;
1615                         list_add_tail(&req->r_private_item, &aio_req->osd_reqs);
1616
1617                         pos += len;
1618                         continue;
1619                 }
1620
1621                 ceph_osdc_start_request(req->r_osdc, req);
1622                 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1623
1624                 if (write)
1625                         ceph_update_write_metrics(metric, req->r_start_latency,
1626                                                   req->r_end_latency, len, ret);
1627                 else
1628                         ceph_update_read_metrics(metric, req->r_start_latency,
1629                                                  req->r_end_latency, len, ret);
1630
1631                 size = i_size_read(inode);
1632                 if (!write) {
1633                         if (sparse && ret >= 0)
1634                                 ret = ceph_sparse_ext_map_end(op);
1635                         else if (ret == -ENOENT)
1636                                 ret = 0;
1637
1638                         if (ret >= 0 && ret < len && pos + ret < size) {
1639                                 struct iov_iter i;
1640                                 int zlen = min_t(size_t, len - ret,
1641                                                  size - pos - ret);
1642
1643                                 iov_iter_bvec(&i, ITER_DEST, bvecs, num_pages, len);
1644                                 iov_iter_advance(&i, ret);
1645                                 iov_iter_zero(zlen, &i);
1646                                 ret += zlen;
1647                         }
1648                         if (ret >= 0)
1649                                 len = ret;
1650                 }
1651
1652                 put_bvecs(bvecs, num_pages, should_dirty);
1653                 ceph_osdc_put_request(req);
1654                 if (ret < 0)
1655                         break;
1656
1657                 pos += len;
1658                 if (!write && pos >= size)
1659                         break;
1660
1661                 if (write && pos > size) {
1662                         if (ceph_inode_set_size(inode, pos))
1663                                 ceph_check_caps(ceph_inode(inode),
1664                                                 CHECK_CAPS_AUTHONLY);
1665                 }
1666         }
1667
1668         if (aio_req) {
1669                 LIST_HEAD(osd_reqs);
1670
1671                 if (aio_req->num_reqs == 0) {
1672                         kfree(aio_req);
1673                         return ret;
1674                 }
1675
1676                 ceph_get_cap_refs(ci, write ? CEPH_CAP_FILE_WR :
1677                                               CEPH_CAP_FILE_RD);
1678
1679                 list_splice(&aio_req->osd_reqs, &osd_reqs);
1680                 inode_dio_begin(inode);
1681                 while (!list_empty(&osd_reqs)) {
1682                         req = list_first_entry(&osd_reqs,
1683                                                struct ceph_osd_request,
1684                                                r_private_item);
1685                         list_del_init(&req->r_private_item);
1686                         if (ret >= 0)
1687                                 ceph_osdc_start_request(req->r_osdc, req);
1688                         if (ret < 0) {
1689                                 req->r_result = ret;
1690                                 ceph_aio_complete_req(req);
1691                         }
1692                 }
1693                 return -EIOCBQUEUED;
1694         }
1695
1696         if (ret != -EOLDSNAPC && pos > iocb->ki_pos) {
1697                 ret = pos - iocb->ki_pos;
1698                 iocb->ki_pos = pos;
1699         }
1700         return ret;
1701 }
1702
1703 /*
1704  * Synchronous write, straight from __user pointer or user pages.
1705  *
1706  * If write spans object boundary, just do multiple writes.  (For a
1707  * correct atomic write, we should e.g. take write locks on all
1708  * objects, rollback on failure, etc.)
1709  */
1710 static ssize_t
1711 ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos,
1712                 struct ceph_snap_context *snapc)
1713 {
1714         struct file *file = iocb->ki_filp;
1715         struct inode *inode = file_inode(file);
1716         struct ceph_inode_info *ci = ceph_inode(inode);
1717         struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
1718         struct ceph_client *cl = fsc->client;
1719         struct ceph_osd_client *osdc = &fsc->client->osdc;
1720         struct ceph_osd_request *req;
1721         struct page **pages;
1722         u64 len;
1723         int num_pages;
1724         int written = 0;
1725         int ret;
1726         bool check_caps = false;
1727         struct timespec64 mtime = current_time(inode);
1728         size_t count = iov_iter_count(from);
1729
1730         if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
1731                 return -EROFS;
1732
1733         doutc(cl, "on file %p %lld~%u snapc %p seq %lld\n", file, pos,
1734               (unsigned)count, snapc, snapc->seq);
1735
1736         ret = filemap_write_and_wait_range(inode->i_mapping,
1737                                            pos, pos + count - 1);
1738         if (ret < 0)
1739                 return ret;
1740
1741         ceph_fscache_invalidate(inode, false);
1742
1743         while ((len = iov_iter_count(from)) > 0) {
1744                 size_t left;
1745                 int n;
1746                 u64 write_pos = pos;
1747                 u64 write_len = len;
1748                 u64 objnum, objoff;
1749                 u32 xlen;
1750                 u64 assert_ver = 0;
1751                 bool rmw;
1752                 bool first, last;
1753                 struct iov_iter saved_iter = *from;
1754                 size_t off;
1755
1756                 ceph_fscrypt_adjust_off_and_len(inode, &write_pos, &write_len);
1757
1758                 /* clamp the length to the end of first object */
1759                 ceph_calc_file_object_mapping(&ci->i_layout, write_pos,
1760                                               write_len, &objnum, &objoff,
1761                                               &xlen);
1762                 write_len = xlen;
1763
1764                 /* adjust len downward if it goes beyond current object */
1765                 if (pos + len > write_pos + write_len)
1766                         len = write_pos + write_len - pos;
1767
1768                 /*
1769                  * If we had to adjust the length or position to align with a
1770                  * crypto block, then we must do a read/modify/write cycle. We
1771                  * use a version assertion to redrive the thing if something
1772                  * changes in between.
1773                  */
1774                 first = pos != write_pos;
1775                 last = (pos + len) != (write_pos + write_len);
1776                 rmw = first || last;
1777
1778                 doutc(cl, "ino %llx %lld~%llu adjusted %lld~%llu -- %srmw\n",
1779                       ci->i_vino.ino, pos, len, write_pos, write_len,
1780                       rmw ? "" : "no ");
1781
1782                 /*
1783                  * The data is emplaced into the page as it would be if it were
1784                  * in an array of pagecache pages.
1785                  */
1786                 num_pages = calc_pages_for(write_pos, write_len);
1787                 pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
1788                 if (IS_ERR(pages)) {
1789                         ret = PTR_ERR(pages);
1790                         break;
1791                 }
1792
1793                 /* Do we need to preload the pages? */
1794                 if (rmw) {
1795                         u64 first_pos = write_pos;
1796                         u64 last_pos = (write_pos + write_len) - CEPH_FSCRYPT_BLOCK_SIZE;
1797                         u64 read_len = CEPH_FSCRYPT_BLOCK_SIZE;
1798                         struct ceph_osd_req_op *op;
1799
1800                         /* We should only need to do this for encrypted inodes */
1801                         WARN_ON_ONCE(!IS_ENCRYPTED(inode));
1802
1803                         /* No need to do two reads if first and last blocks are same */
1804                         if (first && last_pos == first_pos)
1805                                 last = false;
1806
1807                         /*
1808                          * Allocate a read request for one or two extents,
1809                          * depending on how the request was aligned.
1810                          */
1811                         req = ceph_osdc_new_request(osdc, &ci->i_layout,
1812                                         ci->i_vino, first ? first_pos : last_pos,
1813                                         &read_len, 0, (first && last) ? 2 : 1,
1814                                         CEPH_OSD_OP_SPARSE_READ, CEPH_OSD_FLAG_READ,
1815                                         NULL, ci->i_truncate_seq,
1816                                         ci->i_truncate_size, false);
1817                         if (IS_ERR(req)) {
1818                                 ceph_release_page_vector(pages, num_pages);
1819                                 ret = PTR_ERR(req);
1820                                 break;
1821                         }
1822
1823                         /* Something is misaligned! */
1824                         if (read_len != CEPH_FSCRYPT_BLOCK_SIZE) {
1825                                 ceph_osdc_put_request(req);
1826                                 ceph_release_page_vector(pages, num_pages);
1827                                 ret = -EIO;
1828                                 break;
1829                         }
1830
1831                         /* Add extent for first block? */
1832                         op = &req->r_ops[0];
1833
1834                         if (first) {
1835                                 osd_req_op_extent_osd_data_pages(req, 0, pages,
1836                                                          CEPH_FSCRYPT_BLOCK_SIZE,
1837                                                          offset_in_page(first_pos),
1838                                                          false, false);
1839                                 /* We only expect a single extent here */
1840                                 ret = __ceph_alloc_sparse_ext_map(op, 1);
1841                                 if (ret) {
1842                                         ceph_osdc_put_request(req);
1843                                         ceph_release_page_vector(pages, num_pages);
1844                                         break;
1845                                 }
1846                         }
1847
1848                         /* Add extent for last block */
1849                         if (last) {
1850                                 /* Init the other extent if first extent has been used */
1851                                 if (first) {
1852                                         op = &req->r_ops[1];
1853                                         osd_req_op_extent_init(req, 1,
1854                                                         CEPH_OSD_OP_SPARSE_READ,
1855                                                         last_pos, CEPH_FSCRYPT_BLOCK_SIZE,
1856                                                         ci->i_truncate_size,
1857                                                         ci->i_truncate_seq);
1858                                 }
1859
1860                                 ret = __ceph_alloc_sparse_ext_map(op, 1);
1861                                 if (ret) {
1862                                         ceph_osdc_put_request(req);
1863                                         ceph_release_page_vector(pages, num_pages);
1864                                         break;
1865                                 }
1866
1867                                 osd_req_op_extent_osd_data_pages(req, first ? 1 : 0,
1868                                                         &pages[num_pages - 1],
1869                                                         CEPH_FSCRYPT_BLOCK_SIZE,
1870                                                         offset_in_page(last_pos),
1871                                                         false, false);
1872                         }
1873
1874                         ceph_osdc_start_request(osdc, req);
1875                         ret = ceph_osdc_wait_request(osdc, req);
1876
1877                         /* FIXME: length field is wrong if there are 2 extents */
1878                         ceph_update_read_metrics(&fsc->mdsc->metric,
1879                                                  req->r_start_latency,
1880                                                  req->r_end_latency,
1881                                                  read_len, ret);
1882
1883                         /* Ok if object is not already present */
1884                         if (ret == -ENOENT) {
1885                                 /*
1886                                  * If there is no object, then we can't assert
1887                                  * on its version. Set it to 0, and we'll use an
1888                                  * exclusive create instead.
1889                                  */
1890                                 ceph_osdc_put_request(req);
1891                                 ret = 0;
1892
1893                                 /*
1894                                  * zero out the soon-to-be uncopied parts of the
1895                                  * first and last pages.
1896                                  */
1897                                 if (first)
1898                                         zero_user_segment(pages[0], 0,
1899                                                           offset_in_page(first_pos));
1900                                 if (last)
1901                                         zero_user_segment(pages[num_pages - 1],
1902                                                           offset_in_page(last_pos),
1903                                                           PAGE_SIZE);
1904                         } else {
1905                                 if (ret < 0) {
1906                                         ceph_osdc_put_request(req);
1907                                         ceph_release_page_vector(pages, num_pages);
1908                                         break;
1909                                 }
1910
1911                                 op = &req->r_ops[0];
1912                                 if (op->extent.sparse_ext_cnt == 0) {
1913                                         if (first)
1914                                                 zero_user_segment(pages[0], 0,
1915                                                                   offset_in_page(first_pos));
1916                                         else
1917                                                 zero_user_segment(pages[num_pages - 1],
1918                                                                   offset_in_page(last_pos),
1919                                                                   PAGE_SIZE);
1920                                 } else if (op->extent.sparse_ext_cnt != 1 ||
1921                                            ceph_sparse_ext_map_end(op) !=
1922                                                 CEPH_FSCRYPT_BLOCK_SIZE) {
1923                                         ret = -EIO;
1924                                         ceph_osdc_put_request(req);
1925                                         ceph_release_page_vector(pages, num_pages);
1926                                         break;
1927                                 }
1928
1929                                 if (first && last) {
1930                                         op = &req->r_ops[1];
1931                                         if (op->extent.sparse_ext_cnt == 0) {
1932                                                 zero_user_segment(pages[num_pages - 1],
1933                                                                   offset_in_page(last_pos),
1934                                                                   PAGE_SIZE);
1935                                         } else if (op->extent.sparse_ext_cnt != 1 ||
1936                                                    ceph_sparse_ext_map_end(op) !=
1937                                                         CEPH_FSCRYPT_BLOCK_SIZE) {
1938                                                 ret = -EIO;
1939                                                 ceph_osdc_put_request(req);
1940                                                 ceph_release_page_vector(pages, num_pages);
1941                                                 break;
1942                                         }
1943                                 }
1944
1945                                 /* Grab assert version. It must be non-zero. */
1946                                 assert_ver = req->r_version;
1947                                 WARN_ON_ONCE(ret > 0 && assert_ver == 0);
1948
1949                                 ceph_osdc_put_request(req);
1950                                 if (first) {
1951                                         ret = ceph_fscrypt_decrypt_block_inplace(inode,
1952                                                         pages[0], CEPH_FSCRYPT_BLOCK_SIZE,
1953                                                         offset_in_page(first_pos),
1954                                                         first_pos >> CEPH_FSCRYPT_BLOCK_SHIFT);
1955                                         if (ret < 0) {
1956                                                 ceph_release_page_vector(pages, num_pages);
1957                                                 break;
1958                                         }
1959                                 }
1960                                 if (last) {
1961                                         ret = ceph_fscrypt_decrypt_block_inplace(inode,
1962                                                         pages[num_pages - 1],
1963                                                         CEPH_FSCRYPT_BLOCK_SIZE,
1964                                                         offset_in_page(last_pos),
1965                                                         last_pos >> CEPH_FSCRYPT_BLOCK_SHIFT);
1966                                         if (ret < 0) {
1967                                                 ceph_release_page_vector(pages, num_pages);
1968                                                 break;
1969                                         }
1970                                 }
1971                         }
1972                 }
1973
1974                 left = len;
1975                 off = offset_in_page(pos);
1976                 for (n = 0; n < num_pages; n++) {
1977                         size_t plen = min_t(size_t, left, PAGE_SIZE - off);
1978
1979                         /* copy the data */
1980                         ret = copy_page_from_iter(pages[n], off, plen, from);
1981                         if (ret != plen) {
1982                                 ret = -EFAULT;
1983                                 break;
1984                         }
1985                         off = 0;
1986                         left -= ret;
1987                 }
1988                 if (ret < 0) {
1989                         doutc(cl, "write failed with %d\n", ret);
1990                         ceph_release_page_vector(pages, num_pages);
1991                         break;
1992                 }
1993
1994                 if (IS_ENCRYPTED(inode)) {
1995                         ret = ceph_fscrypt_encrypt_pages(inode, pages,
1996                                                          write_pos, write_len,
1997                                                          GFP_KERNEL);
1998                         if (ret < 0) {
1999                                 doutc(cl, "encryption failed with %d\n", ret);
2000                                 ceph_release_page_vector(pages, num_pages);
2001                                 break;
2002                         }
2003                 }
2004
2005                 req = ceph_osdc_new_request(osdc, &ci->i_layout,
2006                                             ci->i_vino, write_pos, &write_len,
2007                                             rmw ? 1 : 0, rmw ? 2 : 1,
2008                                             CEPH_OSD_OP_WRITE,
2009                                             CEPH_OSD_FLAG_WRITE,
2010                                             snapc, ci->i_truncate_seq,
2011                                             ci->i_truncate_size, false);
2012                 if (IS_ERR(req)) {
2013                         ret = PTR_ERR(req);
2014                         ceph_release_page_vector(pages, num_pages);
2015                         break;
2016                 }
2017
2018                 doutc(cl, "write op %lld~%llu\n", write_pos, write_len);
2019                 osd_req_op_extent_osd_data_pages(req, rmw ? 1 : 0, pages, write_len,
2020                                                  offset_in_page(write_pos), false,
2021                                                  true);
2022                 req->r_inode = inode;
2023                 req->r_mtime = mtime;
2024
2025                 /* Set up the assertion */
2026                 if (rmw) {
2027                         /*
2028                          * Set up the assertion. If we don't have a version
2029                          * number, then the object doesn't exist yet. Use an
2030                          * exclusive create instead of a version assertion in
2031                          * that case.
2032                          */
2033                         if (assert_ver) {
2034                                 osd_req_op_init(req, 0, CEPH_OSD_OP_ASSERT_VER, 0);
2035                                 req->r_ops[0].assert_ver.ver = assert_ver;
2036                         } else {
2037                                 osd_req_op_init(req, 0, CEPH_OSD_OP_CREATE,
2038                                                 CEPH_OSD_OP_FLAG_EXCL);
2039                         }
2040                 }
2041
2042                 ceph_osdc_start_request(osdc, req);
2043                 ret = ceph_osdc_wait_request(osdc, req);
2044
2045                 ceph_update_write_metrics(&fsc->mdsc->metric, req->r_start_latency,
2046                                           req->r_end_latency, len, ret);
2047                 ceph_osdc_put_request(req);
2048                 if (ret != 0) {
2049                         doutc(cl, "osd write returned %d\n", ret);
2050                         /* Version changed! Must re-do the rmw cycle */
2051                         if ((assert_ver && (ret == -ERANGE || ret == -EOVERFLOW)) ||
2052                             (!assert_ver && ret == -EEXIST)) {
2053                                 /* We should only ever see this on a rmw */
2054                                 WARN_ON_ONCE(!rmw);
2055
2056                                 /* The version should never go backward */
2057                                 WARN_ON_ONCE(ret == -EOVERFLOW);
2058
2059                                 *from = saved_iter;
2060
2061                                 /* FIXME: limit number of times we loop? */
2062                                 continue;
2063                         }
2064                         ceph_set_error_write(ci);
2065                         break;
2066                 }
2067
2068                 ceph_clear_error_write(ci);
2069
2070                 /*
2071                  * We successfully wrote to a range of the file. Declare
2072                  * that region of the pagecache invalid.
2073                  */
2074                 ret = invalidate_inode_pages2_range(
2075                                 inode->i_mapping,
2076                                 pos >> PAGE_SHIFT,
2077                                 (pos + len - 1) >> PAGE_SHIFT);
2078                 if (ret < 0) {
2079                         doutc(cl, "invalidate_inode_pages2_range returned %d\n",
2080                               ret);
2081                         ret = 0;
2082                 }
2083                 pos += len;
2084                 written += len;
2085                 doutc(cl, "written %d\n", written);
2086                 if (pos > i_size_read(inode)) {
2087                         check_caps = ceph_inode_set_size(inode, pos);
2088                         if (check_caps)
2089                                 ceph_check_caps(ceph_inode(inode),
2090                                                 CHECK_CAPS_AUTHONLY);
2091                 }
2092
2093         }
2094
2095         if (ret != -EOLDSNAPC && written > 0) {
2096                 ret = written;
2097                 iocb->ki_pos = pos;
2098         }
2099         doutc(cl, "returning %d\n", ret);
2100         return ret;
2101 }
2102
2103 /*
2104  * Wrap generic_file_aio_read with checks for cap bits on the inode.
2105  * Atomically grab references, so that those bits are not released
2106  * back to the MDS mid-read.
2107  *
2108  * Hmm, the sync read case isn't actually async... should it be?
2109  */
2110 static ssize_t ceph_read_iter(struct kiocb *iocb, struct iov_iter *to)
2111 {
2112         struct file *filp = iocb->ki_filp;
2113         struct ceph_file_info *fi = filp->private_data;
2114         size_t len = iov_iter_count(to);
2115         struct inode *inode = file_inode(filp);
2116         struct ceph_inode_info *ci = ceph_inode(inode);
2117         bool direct_lock = iocb->ki_flags & IOCB_DIRECT;
2118         struct ceph_client *cl = ceph_inode_to_client(inode);
2119         ssize_t ret;
2120         int want = 0, got = 0;
2121         int retry_op = 0, read = 0;
2122
2123 again:
2124         doutc(cl, "%llu~%u trying to get caps on %p %llx.%llx\n",
2125               iocb->ki_pos, (unsigned)len, inode, ceph_vinop(inode));
2126
2127         if (ceph_inode_is_shutdown(inode))
2128                 return -ESTALE;
2129
2130         if (direct_lock)
2131                 ceph_start_io_direct(inode);
2132         else
2133                 ceph_start_io_read(inode);
2134
2135         if (!(fi->flags & CEPH_F_SYNC) && !direct_lock)
2136                 want |= CEPH_CAP_FILE_CACHE;
2137         if (fi->fmode & CEPH_FILE_MODE_LAZY)
2138                 want |= CEPH_CAP_FILE_LAZYIO;
2139
2140         ret = ceph_get_caps(filp, CEPH_CAP_FILE_RD, want, -1, &got);
2141         if (ret < 0) {
2142                 if (direct_lock)
2143                         ceph_end_io_direct(inode);
2144                 else
2145                         ceph_end_io_read(inode);
2146                 return ret;
2147         }
2148
2149         if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 ||
2150             (iocb->ki_flags & IOCB_DIRECT) ||
2151             (fi->flags & CEPH_F_SYNC)) {
2152
2153                 doutc(cl, "sync %p %llx.%llx %llu~%u got cap refs on %s\n",
2154                       inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
2155                       ceph_cap_string(got));
2156
2157                 if (!ceph_has_inline_data(ci)) {
2158                         if (!retry_op &&
2159                             (iocb->ki_flags & IOCB_DIRECT) &&
2160                             !IS_ENCRYPTED(inode)) {
2161                                 ret = ceph_direct_read_write(iocb, to,
2162                                                              NULL, NULL);
2163                                 if (ret >= 0 && ret < len)
2164                                         retry_op = CHECK_EOF;
2165                         } else {
2166                                 ret = ceph_sync_read(iocb, to, &retry_op);
2167                         }
2168                 } else {
2169                         retry_op = READ_INLINE;
2170                 }
2171         } else {
2172                 CEPH_DEFINE_RW_CONTEXT(rw_ctx, got);
2173                 doutc(cl, "async %p %llx.%llx %llu~%u got cap refs on %s\n",
2174                       inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
2175                       ceph_cap_string(got));
2176                 ceph_add_rw_context(fi, &rw_ctx);
2177                 ret = generic_file_read_iter(iocb, to);
2178                 ceph_del_rw_context(fi, &rw_ctx);
2179         }
2180
2181         doutc(cl, "%p %llx.%llx dropping cap refs on %s = %d\n",
2182               inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret);
2183         ceph_put_cap_refs(ci, got);
2184
2185         if (direct_lock)
2186                 ceph_end_io_direct(inode);
2187         else
2188                 ceph_end_io_read(inode);
2189
2190         if (retry_op > HAVE_RETRIED && ret >= 0) {
2191                 int statret;
2192                 struct page *page = NULL;
2193                 loff_t i_size;
2194                 int mask = CEPH_STAT_CAP_SIZE;
2195                 if (retry_op == READ_INLINE) {
2196                         page = __page_cache_alloc(GFP_KERNEL);
2197                         if (!page)
2198                                 return -ENOMEM;
2199
2200                         mask = CEPH_STAT_CAP_INLINE_DATA;
2201                 }
2202
2203                 statret = __ceph_do_getattr(inode, page, mask, !!page);
2204                 if (statret < 0) {
2205                         if (page)
2206                                 __free_page(page);
2207                         if (statret == -ENODATA) {
2208                                 BUG_ON(retry_op != READ_INLINE);
2209                                 goto again;
2210                         }
2211                         return statret;
2212                 }
2213
2214                 i_size = i_size_read(inode);
2215                 if (retry_op == READ_INLINE) {
2216                         BUG_ON(ret > 0 || read > 0);
2217                         if (iocb->ki_pos < i_size &&
2218                             iocb->ki_pos < PAGE_SIZE) {
2219                                 loff_t end = min_t(loff_t, i_size,
2220                                                    iocb->ki_pos + len);
2221                                 end = min_t(loff_t, end, PAGE_SIZE);
2222                                 if (statret < end)
2223                                         zero_user_segment(page, statret, end);
2224                                 ret = copy_page_to_iter(page,
2225                                                 iocb->ki_pos & ~PAGE_MASK,
2226                                                 end - iocb->ki_pos, to);
2227                                 iocb->ki_pos += ret;
2228                                 read += ret;
2229                         }
2230                         if (iocb->ki_pos < i_size && read < len) {
2231                                 size_t zlen = min_t(size_t, len - read,
2232                                                     i_size - iocb->ki_pos);
2233                                 ret = iov_iter_zero(zlen, to);
2234                                 iocb->ki_pos += ret;
2235                                 read += ret;
2236                         }
2237                         __free_pages(page, 0);
2238                         return read;
2239                 }
2240
2241                 /* hit EOF or hole? */
2242                 if (retry_op == CHECK_EOF && iocb->ki_pos < i_size &&
2243                     ret < len) {
2244                         doutc(cl, "may hit hole, ppos %lld < size %lld, reading more\n",
2245                               iocb->ki_pos, i_size);
2246
2247                         read += ret;
2248                         len -= ret;
2249                         retry_op = HAVE_RETRIED;
2250                         goto again;
2251                 }
2252         }
2253
2254         if (ret >= 0)
2255                 ret += read;
2256
2257         return ret;
2258 }
2259
2260 /*
2261  * Wrap filemap_splice_read with checks for cap bits on the inode.
2262  * Atomically grab references, so that those bits are not released
2263  * back to the MDS mid-read.
2264  */
2265 static ssize_t ceph_splice_read(struct file *in, loff_t *ppos,
2266                                 struct pipe_inode_info *pipe,
2267                                 size_t len, unsigned int flags)
2268 {
2269         struct ceph_file_info *fi = in->private_data;
2270         struct inode *inode = file_inode(in);
2271         struct ceph_inode_info *ci = ceph_inode(inode);
2272         ssize_t ret;
2273         int want = 0, got = 0;
2274         CEPH_DEFINE_RW_CONTEXT(rw_ctx, 0);
2275
2276         dout("splice_read %p %llx.%llx %llu~%zu trying to get caps on %p\n",
2277              inode, ceph_vinop(inode), *ppos, len, inode);
2278
2279         if (ceph_inode_is_shutdown(inode))
2280                 return -ESTALE;
2281
2282         if (ceph_has_inline_data(ci) ||
2283             (fi->flags & CEPH_F_SYNC))
2284                 return copy_splice_read(in, ppos, pipe, len, flags);
2285
2286         ceph_start_io_read(inode);
2287
2288         want = CEPH_CAP_FILE_CACHE;
2289         if (fi->fmode & CEPH_FILE_MODE_LAZY)
2290                 want |= CEPH_CAP_FILE_LAZYIO;
2291
2292         ret = ceph_get_caps(in, CEPH_CAP_FILE_RD, want, -1, &got);
2293         if (ret < 0)
2294                 goto out_end;
2295
2296         if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) == 0) {
2297                 dout("splice_read/sync %p %llx.%llx %llu~%zu got cap refs on %s\n",
2298                      inode, ceph_vinop(inode), *ppos, len,
2299                      ceph_cap_string(got));
2300
2301                 ceph_put_cap_refs(ci, got);
2302                 ceph_end_io_read(inode);
2303                 return copy_splice_read(in, ppos, pipe, len, flags);
2304         }
2305
2306         dout("splice_read %p %llx.%llx %llu~%zu got cap refs on %s\n",
2307              inode, ceph_vinop(inode), *ppos, len, ceph_cap_string(got));
2308
2309         rw_ctx.caps = got;
2310         ceph_add_rw_context(fi, &rw_ctx);
2311         ret = filemap_splice_read(in, ppos, pipe, len, flags);
2312         ceph_del_rw_context(fi, &rw_ctx);
2313
2314         dout("splice_read %p %llx.%llx dropping cap refs on %s = %zd\n",
2315              inode, ceph_vinop(inode), ceph_cap_string(got), ret);
2316
2317         ceph_put_cap_refs(ci, got);
2318 out_end:
2319         ceph_end_io_read(inode);
2320         return ret;
2321 }
2322
2323 /*
2324  * Take cap references to avoid releasing caps to MDS mid-write.
2325  *
2326  * If we are synchronous, and write with an old snap context, the OSD
2327  * may return EOLDSNAPC.  In that case, retry the write.. _after_
2328  * dropping our cap refs and allowing the pending snap to logically
2329  * complete _before_ this write occurs.
2330  *
2331  * If we are near ENOSPC, write synchronously.
2332  */
2333 static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from)
2334 {
2335         struct file *file = iocb->ki_filp;
2336         struct ceph_file_info *fi = file->private_data;
2337         struct inode *inode = file_inode(file);
2338         struct ceph_inode_info *ci = ceph_inode(inode);
2339         struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
2340         struct ceph_client *cl = fsc->client;
2341         struct ceph_osd_client *osdc = &fsc->client->osdc;
2342         struct ceph_cap_flush *prealloc_cf;
2343         ssize_t count, written = 0;
2344         int err, want = 0, got;
2345         bool direct_lock = false;
2346         u32 map_flags;
2347         u64 pool_flags;
2348         loff_t pos;
2349         loff_t limit = max(i_size_read(inode), fsc->max_file_size);
2350
2351         if (ceph_inode_is_shutdown(inode))
2352                 return -ESTALE;
2353
2354         if (ceph_snap(inode) != CEPH_NOSNAP)
2355                 return -EROFS;
2356
2357         prealloc_cf = ceph_alloc_cap_flush();
2358         if (!prealloc_cf)
2359                 return -ENOMEM;
2360
2361         if ((iocb->ki_flags & (IOCB_DIRECT | IOCB_APPEND)) == IOCB_DIRECT)
2362                 direct_lock = true;
2363
2364 retry_snap:
2365         if (direct_lock)
2366                 ceph_start_io_direct(inode);
2367         else
2368                 ceph_start_io_write(inode);
2369
2370         if (iocb->ki_flags & IOCB_APPEND) {
2371                 err = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
2372                 if (err < 0)
2373                         goto out;
2374         }
2375
2376         err = generic_write_checks(iocb, from);
2377         if (err <= 0)
2378                 goto out;
2379
2380         pos = iocb->ki_pos;
2381         if (unlikely(pos >= limit)) {
2382                 err = -EFBIG;
2383                 goto out;
2384         } else {
2385                 iov_iter_truncate(from, limit - pos);
2386         }
2387
2388         count = iov_iter_count(from);
2389         if (ceph_quota_is_max_bytes_exceeded(inode, pos + count)) {
2390                 err = -EDQUOT;
2391                 goto out;
2392         }
2393
2394         down_read(&osdc->lock);
2395         map_flags = osdc->osdmap->flags;
2396         pool_flags = ceph_pg_pool_flags(osdc->osdmap, ci->i_layout.pool_id);
2397         up_read(&osdc->lock);
2398         if ((map_flags & CEPH_OSDMAP_FULL) ||
2399             (pool_flags & CEPH_POOL_FLAG_FULL)) {
2400                 err = -ENOSPC;
2401                 goto out;
2402         }
2403
2404         err = file_remove_privs(file);
2405         if (err)
2406                 goto out;
2407
2408         doutc(cl, "%p %llx.%llx %llu~%zd getting caps. i_size %llu\n",
2409               inode, ceph_vinop(inode), pos, count,
2410               i_size_read(inode));
2411         if (!(fi->flags & CEPH_F_SYNC) && !direct_lock)
2412                 want |= CEPH_CAP_FILE_BUFFER;
2413         if (fi->fmode & CEPH_FILE_MODE_LAZY)
2414                 want |= CEPH_CAP_FILE_LAZYIO;
2415         got = 0;
2416         err = ceph_get_caps(file, CEPH_CAP_FILE_WR, want, pos + count, &got);
2417         if (err < 0)
2418                 goto out;
2419
2420         err = file_update_time(file);
2421         if (err)
2422                 goto out_caps;
2423
2424         inode_inc_iversion_raw(inode);
2425
2426         doutc(cl, "%p %llx.%llx %llu~%zd got cap refs on %s\n",
2427               inode, ceph_vinop(inode), pos, count, ceph_cap_string(got));
2428
2429         if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 ||
2430             (iocb->ki_flags & IOCB_DIRECT) || (fi->flags & CEPH_F_SYNC) ||
2431             (ci->i_ceph_flags & CEPH_I_ERROR_WRITE)) {
2432                 struct ceph_snap_context *snapc;
2433                 struct iov_iter data;
2434
2435                 spin_lock(&ci->i_ceph_lock);
2436                 if (__ceph_have_pending_cap_snap(ci)) {
2437                         struct ceph_cap_snap *capsnap =
2438                                         list_last_entry(&ci->i_cap_snaps,
2439                                                         struct ceph_cap_snap,
2440                                                         ci_item);
2441                         snapc = ceph_get_snap_context(capsnap->context);
2442                 } else {
2443                         BUG_ON(!ci->i_head_snapc);
2444                         snapc = ceph_get_snap_context(ci->i_head_snapc);
2445                 }
2446                 spin_unlock(&ci->i_ceph_lock);
2447
2448                 /* we might need to revert back to that point */
2449                 data = *from;
2450                 if ((iocb->ki_flags & IOCB_DIRECT) && !IS_ENCRYPTED(inode))
2451                         written = ceph_direct_read_write(iocb, &data, snapc,
2452                                                          &prealloc_cf);
2453                 else
2454                         written = ceph_sync_write(iocb, &data, pos, snapc);
2455                 if (direct_lock)
2456                         ceph_end_io_direct(inode);
2457                 else
2458                         ceph_end_io_write(inode);
2459                 if (written > 0)
2460                         iov_iter_advance(from, written);
2461                 ceph_put_snap_context(snapc);
2462         } else {
2463                 /*
2464                  * No need to acquire the i_truncate_mutex. Because
2465                  * the MDS revokes Fwb caps before sending truncate
2466                  * message to us. We can't get Fwb cap while there
2467                  * are pending vmtruncate. So write and vmtruncate
2468                  * can not run at the same time
2469                  */
2470                 written = generic_perform_write(iocb, from);
2471                 ceph_end_io_write(inode);
2472         }
2473
2474         if (written >= 0) {
2475                 int dirty;
2476
2477                 spin_lock(&ci->i_ceph_lock);
2478                 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
2479                                                &prealloc_cf);
2480                 spin_unlock(&ci->i_ceph_lock);
2481                 if (dirty)
2482                         __mark_inode_dirty(inode, dirty);
2483                 if (ceph_quota_is_max_bytes_approaching(inode, iocb->ki_pos))
2484                         ceph_check_caps(ci, CHECK_CAPS_FLUSH);
2485         }
2486
2487         doutc(cl, "%p %llx.%llx %llu~%u  dropping cap refs on %s\n",
2488               inode, ceph_vinop(inode), pos, (unsigned)count,
2489               ceph_cap_string(got));
2490         ceph_put_cap_refs(ci, got);
2491
2492         if (written == -EOLDSNAPC) {
2493                 doutc(cl, "%p %llx.%llx %llu~%u" "got EOLDSNAPC, retrying\n",
2494                       inode, ceph_vinop(inode), pos, (unsigned)count);
2495                 goto retry_snap;
2496         }
2497
2498         if (written >= 0) {
2499                 if ((map_flags & CEPH_OSDMAP_NEARFULL) ||
2500                     (pool_flags & CEPH_POOL_FLAG_NEARFULL))
2501                         iocb->ki_flags |= IOCB_DSYNC;
2502                 written = generic_write_sync(iocb, written);
2503         }
2504
2505         goto out_unlocked;
2506 out_caps:
2507         ceph_put_cap_refs(ci, got);
2508 out:
2509         if (direct_lock)
2510                 ceph_end_io_direct(inode);
2511         else
2512                 ceph_end_io_write(inode);
2513 out_unlocked:
2514         ceph_free_cap_flush(prealloc_cf);
2515         return written ? written : err;
2516 }
2517
2518 /*
2519  * llseek.  be sure to verify file size on SEEK_END.
2520  */
2521 static loff_t ceph_llseek(struct file *file, loff_t offset, int whence)
2522 {
2523         if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) {
2524                 struct inode *inode = file_inode(file);
2525                 int ret;
2526
2527                 ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
2528                 if (ret < 0)
2529                         return ret;
2530         }
2531         return generic_file_llseek(file, offset, whence);
2532 }
2533
2534 static inline void ceph_zero_partial_page(
2535         struct inode *inode, loff_t offset, unsigned size)
2536 {
2537         struct page *page;
2538         pgoff_t index = offset >> PAGE_SHIFT;
2539
2540         page = find_lock_page(inode->i_mapping, index);
2541         if (page) {
2542                 wait_on_page_writeback(page);
2543                 zero_user(page, offset & (PAGE_SIZE - 1), size);
2544                 unlock_page(page);
2545                 put_page(page);
2546         }
2547 }
2548
2549 static void ceph_zero_pagecache_range(struct inode *inode, loff_t offset,
2550                                       loff_t length)
2551 {
2552         loff_t nearly = round_up(offset, PAGE_SIZE);
2553         if (offset < nearly) {
2554                 loff_t size = nearly - offset;
2555                 if (length < size)
2556                         size = length;
2557                 ceph_zero_partial_page(inode, offset, size);
2558                 offset += size;
2559                 length -= size;
2560         }
2561         if (length >= PAGE_SIZE) {
2562                 loff_t size = round_down(length, PAGE_SIZE);
2563                 truncate_pagecache_range(inode, offset, offset + size - 1);
2564                 offset += size;
2565                 length -= size;
2566         }
2567         if (length)
2568                 ceph_zero_partial_page(inode, offset, length);
2569 }
2570
2571 static int ceph_zero_partial_object(struct inode *inode,
2572                                     loff_t offset, loff_t *length)
2573 {
2574         struct ceph_inode_info *ci = ceph_inode(inode);
2575         struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
2576         struct ceph_osd_request *req;
2577         int ret = 0;
2578         loff_t zero = 0;
2579         int op;
2580
2581         if (ceph_inode_is_shutdown(inode))
2582                 return -EIO;
2583
2584         if (!length) {
2585                 op = offset ? CEPH_OSD_OP_DELETE : CEPH_OSD_OP_TRUNCATE;
2586                 length = &zero;
2587         } else {
2588                 op = CEPH_OSD_OP_ZERO;
2589         }
2590
2591         req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
2592                                         ceph_vino(inode),
2593                                         offset, length,
2594                                         0, 1, op,
2595                                         CEPH_OSD_FLAG_WRITE,
2596                                         NULL, 0, 0, false);
2597         if (IS_ERR(req)) {
2598                 ret = PTR_ERR(req);
2599                 goto out;
2600         }
2601
2602         req->r_mtime = inode_get_mtime(inode);
2603         ceph_osdc_start_request(&fsc->client->osdc, req);
2604         ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
2605         if (ret == -ENOENT)
2606                 ret = 0;
2607         ceph_osdc_put_request(req);
2608
2609 out:
2610         return ret;
2611 }
2612
2613 static int ceph_zero_objects(struct inode *inode, loff_t offset, loff_t length)
2614 {
2615         int ret = 0;
2616         struct ceph_inode_info *ci = ceph_inode(inode);
2617         s32 stripe_unit = ci->i_layout.stripe_unit;
2618         s32 stripe_count = ci->i_layout.stripe_count;
2619         s32 object_size = ci->i_layout.object_size;
2620         u64 object_set_size = object_size * stripe_count;
2621         u64 nearly, t;
2622
2623         /* round offset up to next period boundary */
2624         nearly = offset + object_set_size - 1;
2625         t = nearly;
2626         nearly -= do_div(t, object_set_size);
2627
2628         while (length && offset < nearly) {
2629                 loff_t size = length;
2630                 ret = ceph_zero_partial_object(inode, offset, &size);
2631                 if (ret < 0)
2632                         return ret;
2633                 offset += size;
2634                 length -= size;
2635         }
2636         while (length >= object_set_size) {
2637                 int i;
2638                 loff_t pos = offset;
2639                 for (i = 0; i < stripe_count; ++i) {
2640                         ret = ceph_zero_partial_object(inode, pos, NULL);
2641                         if (ret < 0)
2642                                 return ret;
2643                         pos += stripe_unit;
2644                 }
2645                 offset += object_set_size;
2646                 length -= object_set_size;
2647         }
2648         while (length) {
2649                 loff_t size = length;
2650                 ret = ceph_zero_partial_object(inode, offset, &size);
2651                 if (ret < 0)
2652                         return ret;
2653                 offset += size;
2654                 length -= size;
2655         }
2656         return ret;
2657 }
2658
2659 static long ceph_fallocate(struct file *file, int mode,
2660                                 loff_t offset, loff_t length)
2661 {
2662         struct ceph_file_info *fi = file->private_data;
2663         struct inode *inode = file_inode(file);
2664         struct ceph_inode_info *ci = ceph_inode(inode);
2665         struct ceph_cap_flush *prealloc_cf;
2666         struct ceph_client *cl = ceph_inode_to_client(inode);
2667         int want, got = 0;
2668         int dirty;
2669         int ret = 0;
2670         loff_t endoff = 0;
2671         loff_t size;
2672
2673         doutc(cl, "%p %llx.%llx mode %x, offset %llu length %llu\n",
2674               inode, ceph_vinop(inode), mode, offset, length);
2675
2676         if (mode != (FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
2677                 return -EOPNOTSUPP;
2678
2679         if (!S_ISREG(inode->i_mode))
2680                 return -EOPNOTSUPP;
2681
2682         if (IS_ENCRYPTED(inode))
2683                 return -EOPNOTSUPP;
2684
2685         prealloc_cf = ceph_alloc_cap_flush();
2686         if (!prealloc_cf)
2687                 return -ENOMEM;
2688
2689         inode_lock(inode);
2690
2691         if (ceph_snap(inode) != CEPH_NOSNAP) {
2692                 ret = -EROFS;
2693                 goto unlock;
2694         }
2695
2696         size = i_size_read(inode);
2697
2698         /* Are we punching a hole beyond EOF? */
2699         if (offset >= size)
2700                 goto unlock;
2701         if ((offset + length) > size)
2702                 length = size - offset;
2703
2704         if (fi->fmode & CEPH_FILE_MODE_LAZY)
2705                 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
2706         else
2707                 want = CEPH_CAP_FILE_BUFFER;
2708
2709         ret = ceph_get_caps(file, CEPH_CAP_FILE_WR, want, endoff, &got);
2710         if (ret < 0)
2711                 goto unlock;
2712
2713         ret = file_modified(file);
2714         if (ret)
2715                 goto put_caps;
2716
2717         filemap_invalidate_lock(inode->i_mapping);
2718         ceph_fscache_invalidate(inode, false);
2719         ceph_zero_pagecache_range(inode, offset, length);
2720         ret = ceph_zero_objects(inode, offset, length);
2721
2722         if (!ret) {
2723                 spin_lock(&ci->i_ceph_lock);
2724                 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
2725                                                &prealloc_cf);
2726                 spin_unlock(&ci->i_ceph_lock);
2727                 if (dirty)
2728                         __mark_inode_dirty(inode, dirty);
2729         }
2730         filemap_invalidate_unlock(inode->i_mapping);
2731
2732 put_caps:
2733         ceph_put_cap_refs(ci, got);
2734 unlock:
2735         inode_unlock(inode);
2736         ceph_free_cap_flush(prealloc_cf);
2737         return ret;
2738 }
2739
2740 /*
2741  * This function tries to get FILE_WR capabilities for dst_ci and FILE_RD for
2742  * src_ci.  Two attempts are made to obtain both caps, and an error is return if
2743  * this fails; zero is returned on success.
2744  */
2745 static int get_rd_wr_caps(struct file *src_filp, int *src_got,
2746                           struct file *dst_filp,
2747                           loff_t dst_endoff, int *dst_got)
2748 {
2749         int ret = 0;
2750         bool retrying = false;
2751
2752 retry_caps:
2753         ret = ceph_get_caps(dst_filp, CEPH_CAP_FILE_WR, CEPH_CAP_FILE_BUFFER,
2754                             dst_endoff, dst_got);
2755         if (ret < 0)
2756                 return ret;
2757
2758         /*
2759          * Since we're already holding the FILE_WR capability for the dst file,
2760          * we would risk a deadlock by using ceph_get_caps.  Thus, we'll do some
2761          * retry dance instead to try to get both capabilities.
2762          */
2763         ret = ceph_try_get_caps(file_inode(src_filp),
2764                                 CEPH_CAP_FILE_RD, CEPH_CAP_FILE_SHARED,
2765                                 false, src_got);
2766         if (ret <= 0) {
2767                 /* Start by dropping dst_ci caps and getting src_ci caps */
2768                 ceph_put_cap_refs(ceph_inode(file_inode(dst_filp)), *dst_got);
2769                 if (retrying) {
2770                         if (!ret)
2771                                 /* ceph_try_get_caps masks EAGAIN */
2772                                 ret = -EAGAIN;
2773                         return ret;
2774                 }
2775                 ret = ceph_get_caps(src_filp, CEPH_CAP_FILE_RD,
2776                                     CEPH_CAP_FILE_SHARED, -1, src_got);
2777                 if (ret < 0)
2778                         return ret;
2779                 /*... drop src_ci caps too, and retry */
2780                 ceph_put_cap_refs(ceph_inode(file_inode(src_filp)), *src_got);
2781                 retrying = true;
2782                 goto retry_caps;
2783         }
2784         return ret;
2785 }
2786
2787 static void put_rd_wr_caps(struct ceph_inode_info *src_ci, int src_got,
2788                            struct ceph_inode_info *dst_ci, int dst_got)
2789 {
2790         ceph_put_cap_refs(src_ci, src_got);
2791         ceph_put_cap_refs(dst_ci, dst_got);
2792 }
2793
2794 /*
2795  * This function does several size-related checks, returning an error if:
2796  *  - source file is smaller than off+len
2797  *  - destination file size is not OK (inode_newsize_ok())
2798  *  - max bytes quotas is exceeded
2799  */
2800 static int is_file_size_ok(struct inode *src_inode, struct inode *dst_inode,
2801                            loff_t src_off, loff_t dst_off, size_t len)
2802 {
2803         struct ceph_client *cl = ceph_inode_to_client(src_inode);
2804         loff_t size, endoff;
2805
2806         size = i_size_read(src_inode);
2807         /*
2808          * Don't copy beyond source file EOF.  Instead of simply setting length
2809          * to (size - src_off), just drop to VFS default implementation, as the
2810          * local i_size may be stale due to other clients writing to the source
2811          * inode.
2812          */
2813         if (src_off + len > size) {
2814                 doutc(cl, "Copy beyond EOF (%llu + %zu > %llu)\n", src_off,
2815                       len, size);
2816                 return -EOPNOTSUPP;
2817         }
2818         size = i_size_read(dst_inode);
2819
2820         endoff = dst_off + len;
2821         if (inode_newsize_ok(dst_inode, endoff))
2822                 return -EOPNOTSUPP;
2823
2824         if (ceph_quota_is_max_bytes_exceeded(dst_inode, endoff))
2825                 return -EDQUOT;
2826
2827         return 0;
2828 }
2829
2830 static struct ceph_osd_request *
2831 ceph_alloc_copyfrom_request(struct ceph_osd_client *osdc,
2832                             u64 src_snapid,
2833                             struct ceph_object_id *src_oid,
2834                             struct ceph_object_locator *src_oloc,
2835                             struct ceph_object_id *dst_oid,
2836                             struct ceph_object_locator *dst_oloc,
2837                             u32 truncate_seq, u64 truncate_size)
2838 {
2839         struct ceph_osd_request *req;
2840         int ret;
2841         u32 src_fadvise_flags =
2842                 CEPH_OSD_OP_FLAG_FADVISE_SEQUENTIAL |
2843                 CEPH_OSD_OP_FLAG_FADVISE_NOCACHE;
2844         u32 dst_fadvise_flags =
2845                 CEPH_OSD_OP_FLAG_FADVISE_SEQUENTIAL |
2846                 CEPH_OSD_OP_FLAG_FADVISE_DONTNEED;
2847
2848         req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_KERNEL);
2849         if (!req)
2850                 return ERR_PTR(-ENOMEM);
2851
2852         req->r_flags = CEPH_OSD_FLAG_WRITE;
2853
2854         ceph_oloc_copy(&req->r_t.base_oloc, dst_oloc);
2855         ceph_oid_copy(&req->r_t.base_oid, dst_oid);
2856
2857         ret = osd_req_op_copy_from_init(req, src_snapid, 0,
2858                                         src_oid, src_oloc,
2859                                         src_fadvise_flags,
2860                                         dst_fadvise_flags,
2861                                         truncate_seq,
2862                                         truncate_size,
2863                                         CEPH_OSD_COPY_FROM_FLAG_TRUNCATE_SEQ);
2864         if (ret)
2865                 goto out;
2866
2867         ret = ceph_osdc_alloc_messages(req, GFP_KERNEL);
2868         if (ret)
2869                 goto out;
2870
2871         return req;
2872
2873 out:
2874         ceph_osdc_put_request(req);
2875         return ERR_PTR(ret);
2876 }
2877
2878 static ssize_t ceph_do_objects_copy(struct ceph_inode_info *src_ci, u64 *src_off,
2879                                     struct ceph_inode_info *dst_ci, u64 *dst_off,
2880                                     struct ceph_fs_client *fsc,
2881                                     size_t len, unsigned int flags)
2882 {
2883         struct ceph_object_locator src_oloc, dst_oloc;
2884         struct ceph_object_id src_oid, dst_oid;
2885         struct ceph_osd_client *osdc;
2886         struct ceph_osd_request *req;
2887         size_t bytes = 0;
2888         u64 src_objnum, src_objoff, dst_objnum, dst_objoff;
2889         u32 src_objlen, dst_objlen;
2890         u32 object_size = src_ci->i_layout.object_size;
2891         struct ceph_client *cl = fsc->client;
2892         int ret;
2893
2894         src_oloc.pool = src_ci->i_layout.pool_id;
2895         src_oloc.pool_ns = ceph_try_get_string(src_ci->i_layout.pool_ns);
2896         dst_oloc.pool = dst_ci->i_layout.pool_id;
2897         dst_oloc.pool_ns = ceph_try_get_string(dst_ci->i_layout.pool_ns);
2898         osdc = &fsc->client->osdc;
2899
2900         while (len >= object_size) {
2901                 ceph_calc_file_object_mapping(&src_ci->i_layout, *src_off,
2902                                               object_size, &src_objnum,
2903                                               &src_objoff, &src_objlen);
2904                 ceph_calc_file_object_mapping(&dst_ci->i_layout, *dst_off,
2905                                               object_size, &dst_objnum,
2906                                               &dst_objoff, &dst_objlen);
2907                 ceph_oid_init(&src_oid);
2908                 ceph_oid_printf(&src_oid, "%llx.%08llx",
2909                                 src_ci->i_vino.ino, src_objnum);
2910                 ceph_oid_init(&dst_oid);
2911                 ceph_oid_printf(&dst_oid, "%llx.%08llx",
2912                                 dst_ci->i_vino.ino, dst_objnum);
2913                 /* Do an object remote copy */
2914                 req = ceph_alloc_copyfrom_request(osdc, src_ci->i_vino.snap,
2915                                                   &src_oid, &src_oloc,
2916                                                   &dst_oid, &dst_oloc,
2917                                                   dst_ci->i_truncate_seq,
2918                                                   dst_ci->i_truncate_size);
2919                 if (IS_ERR(req))
2920                         ret = PTR_ERR(req);
2921                 else {
2922                         ceph_osdc_start_request(osdc, req);
2923                         ret = ceph_osdc_wait_request(osdc, req);
2924                         ceph_update_copyfrom_metrics(&fsc->mdsc->metric,
2925                                                      req->r_start_latency,
2926                                                      req->r_end_latency,
2927                                                      object_size, ret);
2928                         ceph_osdc_put_request(req);
2929                 }
2930                 if (ret) {
2931                         if (ret == -EOPNOTSUPP) {
2932                                 fsc->have_copy_from2 = false;
2933                                 pr_notice_client(cl,
2934                                         "OSDs don't support copy-from2; disabling copy offload\n");
2935                         }
2936                         doutc(cl, "returned %d\n", ret);
2937                         if (!bytes)
2938                                 bytes = ret;
2939                         goto out;
2940                 }
2941                 len -= object_size;
2942                 bytes += object_size;
2943                 *src_off += object_size;
2944                 *dst_off += object_size;
2945         }
2946
2947 out:
2948         ceph_oloc_destroy(&src_oloc);
2949         ceph_oloc_destroy(&dst_oloc);
2950         return bytes;
2951 }
2952
2953 static ssize_t __ceph_copy_file_range(struct file *src_file, loff_t src_off,
2954                                       struct file *dst_file, loff_t dst_off,
2955                                       size_t len, unsigned int flags)
2956 {
2957         struct inode *src_inode = file_inode(src_file);
2958         struct inode *dst_inode = file_inode(dst_file);
2959         struct ceph_inode_info *src_ci = ceph_inode(src_inode);
2960         struct ceph_inode_info *dst_ci = ceph_inode(dst_inode);
2961         struct ceph_cap_flush *prealloc_cf;
2962         struct ceph_fs_client *src_fsc = ceph_inode_to_fs_client(src_inode);
2963         struct ceph_client *cl = src_fsc->client;
2964         loff_t size;
2965         ssize_t ret = -EIO, bytes;
2966         u64 src_objnum, dst_objnum, src_objoff, dst_objoff;
2967         u32 src_objlen, dst_objlen;
2968         int src_got = 0, dst_got = 0, err, dirty;
2969
2970         if (src_inode->i_sb != dst_inode->i_sb) {
2971                 struct ceph_fs_client *dst_fsc = ceph_inode_to_fs_client(dst_inode);
2972
2973                 if (ceph_fsid_compare(&src_fsc->client->fsid,
2974                                       &dst_fsc->client->fsid)) {
2975                         dout("Copying files across clusters: src: %pU dst: %pU\n",
2976                              &src_fsc->client->fsid, &dst_fsc->client->fsid);
2977                         return -EXDEV;
2978                 }
2979         }
2980         if (ceph_snap(dst_inode) != CEPH_NOSNAP)
2981                 return -EROFS;
2982
2983         /*
2984          * Some of the checks below will return -EOPNOTSUPP, which will force a
2985          * fallback to the default VFS copy_file_range implementation.  This is
2986          * desirable in several cases (for ex, the 'len' is smaller than the
2987          * size of the objects, or in cases where that would be more
2988          * efficient).
2989          */
2990
2991         if (ceph_test_mount_opt(src_fsc, NOCOPYFROM))
2992                 return -EOPNOTSUPP;
2993
2994         if (!src_fsc->have_copy_from2)
2995                 return -EOPNOTSUPP;
2996
2997         /*
2998          * Striped file layouts require that we copy partial objects, but the
2999          * OSD copy-from operation only supports full-object copies.  Limit
3000          * this to non-striped file layouts for now.
3001          */
3002         if ((src_ci->i_layout.stripe_unit != dst_ci->i_layout.stripe_unit) ||
3003             (src_ci->i_layout.stripe_count != 1) ||
3004             (dst_ci->i_layout.stripe_count != 1) ||
3005             (src_ci->i_layout.object_size != dst_ci->i_layout.object_size)) {
3006                 doutc(cl, "Invalid src/dst files layout\n");
3007                 return -EOPNOTSUPP;
3008         }
3009
3010         /* Every encrypted inode gets its own key, so we can't offload them */
3011         if (IS_ENCRYPTED(src_inode) || IS_ENCRYPTED(dst_inode))
3012                 return -EOPNOTSUPP;
3013
3014         if (len < src_ci->i_layout.object_size)
3015                 return -EOPNOTSUPP; /* no remote copy will be done */
3016
3017         prealloc_cf = ceph_alloc_cap_flush();
3018         if (!prealloc_cf)
3019                 return -ENOMEM;
3020
3021         /* Start by sync'ing the source and destination files */
3022         ret = file_write_and_wait_range(src_file, src_off, (src_off + len));
3023         if (ret < 0) {
3024                 doutc(cl, "failed to write src file (%zd)\n", ret);
3025                 goto out;
3026         }
3027         ret = file_write_and_wait_range(dst_file, dst_off, (dst_off + len));
3028         if (ret < 0) {
3029                 doutc(cl, "failed to write dst file (%zd)\n", ret);
3030                 goto out;
3031         }
3032
3033         /*
3034          * We need FILE_WR caps for dst_ci and FILE_RD for src_ci as other
3035          * clients may have dirty data in their caches.  And OSDs know nothing
3036          * about caps, so they can't safely do the remote object copies.
3037          */
3038         err = get_rd_wr_caps(src_file, &src_got,
3039                              dst_file, (dst_off + len), &dst_got);
3040         if (err < 0) {
3041                 doutc(cl, "get_rd_wr_caps returned %d\n", err);
3042                 ret = -EOPNOTSUPP;
3043                 goto out;
3044         }
3045
3046         ret = is_file_size_ok(src_inode, dst_inode, src_off, dst_off, len);
3047         if (ret < 0)
3048                 goto out_caps;
3049
3050         /* Drop dst file cached pages */
3051         ceph_fscache_invalidate(dst_inode, false);
3052         ret = invalidate_inode_pages2_range(dst_inode->i_mapping,
3053                                             dst_off >> PAGE_SHIFT,
3054                                             (dst_off + len) >> PAGE_SHIFT);
3055         if (ret < 0) {
3056                 doutc(cl, "Failed to invalidate inode pages (%zd)\n",
3057                             ret);
3058                 ret = 0; /* XXX */
3059         }
3060         ceph_calc_file_object_mapping(&src_ci->i_layout, src_off,
3061                                       src_ci->i_layout.object_size,
3062                                       &src_objnum, &src_objoff, &src_objlen);
3063         ceph_calc_file_object_mapping(&dst_ci->i_layout, dst_off,
3064                                       dst_ci->i_layout.object_size,
3065                                       &dst_objnum, &dst_objoff, &dst_objlen);
3066         /* object-level offsets need to the same */
3067         if (src_objoff != dst_objoff) {
3068                 ret = -EOPNOTSUPP;
3069                 goto out_caps;
3070         }
3071
3072         /*
3073          * Do a manual copy if the object offset isn't object aligned.
3074          * 'src_objlen' contains the bytes left until the end of the object,
3075          * starting at the src_off
3076          */
3077         if (src_objoff) {
3078                 doutc(cl, "Initial partial copy of %u bytes\n", src_objlen);
3079
3080                 /*
3081                  * we need to temporarily drop all caps as we'll be calling
3082                  * {read,write}_iter, which will get caps again.
3083                  */
3084                 put_rd_wr_caps(src_ci, src_got, dst_ci, dst_got);
3085                 ret = splice_file_range(src_file, &src_off, dst_file, &dst_off,
3086                                         src_objlen);
3087                 /* Abort on short copies or on error */
3088                 if (ret < (long)src_objlen) {
3089                         doutc(cl, "Failed partial copy (%zd)\n", ret);
3090                         goto out;
3091                 }
3092                 len -= ret;
3093                 err = get_rd_wr_caps(src_file, &src_got,
3094                                      dst_file, (dst_off + len), &dst_got);
3095                 if (err < 0)
3096                         goto out;
3097                 err = is_file_size_ok(src_inode, dst_inode,
3098                                       src_off, dst_off, len);
3099                 if (err < 0)
3100                         goto out_caps;
3101         }
3102
3103         size = i_size_read(dst_inode);
3104         bytes = ceph_do_objects_copy(src_ci, &src_off, dst_ci, &dst_off,
3105                                      src_fsc, len, flags);
3106         if (bytes <= 0) {
3107                 if (!ret)
3108                         ret = bytes;
3109                 goto out_caps;
3110         }
3111         doutc(cl, "Copied %zu bytes out of %zu\n", bytes, len);
3112         len -= bytes;
3113         ret += bytes;
3114
3115         file_update_time(dst_file);
3116         inode_inc_iversion_raw(dst_inode);
3117
3118         if (dst_off > size) {
3119                 /* Let the MDS know about dst file size change */
3120                 if (ceph_inode_set_size(dst_inode, dst_off) ||
3121                     ceph_quota_is_max_bytes_approaching(dst_inode, dst_off))
3122                         ceph_check_caps(dst_ci, CHECK_CAPS_AUTHONLY | CHECK_CAPS_FLUSH);
3123         }
3124         /* Mark Fw dirty */
3125         spin_lock(&dst_ci->i_ceph_lock);
3126         dirty = __ceph_mark_dirty_caps(dst_ci, CEPH_CAP_FILE_WR, &prealloc_cf);
3127         spin_unlock(&dst_ci->i_ceph_lock);
3128         if (dirty)
3129                 __mark_inode_dirty(dst_inode, dirty);
3130
3131 out_caps:
3132         put_rd_wr_caps(src_ci, src_got, dst_ci, dst_got);
3133
3134         /*
3135          * Do the final manual copy if we still have some bytes left, unless
3136          * there were errors in remote object copies (len >= object_size).
3137          */
3138         if (len && (len < src_ci->i_layout.object_size)) {
3139                 doutc(cl, "Final partial copy of %zu bytes\n", len);
3140                 bytes = splice_file_range(src_file, &src_off, dst_file,
3141                                           &dst_off, len);
3142                 if (bytes > 0)
3143                         ret += bytes;
3144                 else
3145                         doutc(cl, "Failed partial copy (%zd)\n", bytes);
3146         }
3147
3148 out:
3149         ceph_free_cap_flush(prealloc_cf);
3150
3151         return ret;
3152 }
3153
3154 static ssize_t ceph_copy_file_range(struct file *src_file, loff_t src_off,
3155                                     struct file *dst_file, loff_t dst_off,
3156                                     size_t len, unsigned int flags)
3157 {
3158         ssize_t ret;
3159
3160         ret = __ceph_copy_file_range(src_file, src_off, dst_file, dst_off,
3161                                      len, flags);
3162
3163         if (ret == -EOPNOTSUPP || ret == -EXDEV)
3164                 ret = splice_copy_file_range(src_file, src_off, dst_file,
3165                                              dst_off, len);
3166         return ret;
3167 }
3168
3169 const struct file_operations ceph_file_fops = {
3170         .open = ceph_open,
3171         .release = ceph_release,
3172         .llseek = ceph_llseek,
3173         .read_iter = ceph_read_iter,
3174         .write_iter = ceph_write_iter,
3175         .mmap = ceph_mmap,
3176         .fsync = ceph_fsync,
3177         .lock = ceph_lock,
3178         .setlease = simple_nosetlease,
3179         .flock = ceph_flock,
3180         .splice_read = ceph_splice_read,
3181         .splice_write = iter_file_splice_write,
3182         .unlocked_ioctl = ceph_ioctl,
3183         .compat_ioctl = compat_ptr_ioctl,
3184         .fallocate      = ceph_fallocate,
3185         .copy_file_range = ceph_copy_file_range,
3186 };