fs/ceph/file.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/ceph/ceph_debug.h>
   3 #include <linux/ceph/striper.h>
   4
   5 #include <linux/module.h>
   6 #include <linux/sched.h>
   7 #include <linux/slab.h>
   8 #include <linux/file.h>
   9 #include <linux/mount.h>
  10 #include <linux/namei.h>
  11 #include <linux/writeback.h>
  12 #include <linux/falloc.h>
  13 #include <linux/iversion.h>
  14 #include <linux/ktime.h>
  15
  16 #include "super.h"
  17 #include "mds_client.h"
  18 #include "cache.h"
  19 #include "io.h"
  20 #include "metric.h"
  21
  22 static __le32 ceph_flags_sys2wire(u32 flags)
  23 {
  24         u32 wire_flags = 0;
  25
  26         switch (flags & O_ACCMODE) {
  27         case O_RDONLY:
  28                 wire_flags |= CEPH_O_RDONLY;
  29                 break;
  30         case O_WRONLY:
  31                 wire_flags |= CEPH_O_WRONLY;
  32                 break;
  33         case O_RDWR:
  34                 wire_flags |= CEPH_O_RDWR;
  35                 break;
  36         }
  37
  38         flags &= ~O_ACCMODE;
  39
  40 #define ceph_sys2wire(a) if (flags & a) { wire_flags |= CEPH_##a; flags &= ~a; }
  41
  42         ceph_sys2wire(O_CREAT);
  43         ceph_sys2wire(O_EXCL);
  44         ceph_sys2wire(O_TRUNC);
  45         ceph_sys2wire(O_DIRECTORY);
  46         ceph_sys2wire(O_NOFOLLOW);
  47
  48 #undef ceph_sys2wire
  49
  50         if (flags)
  51                 dout("unused open flags: %x\n", flags);
  52
  53         return cpu_to_le32(wire_flags);
  54 }
  55
  56 /*
  57  * Ceph file operations
  58  *
  59  * Implement basic open/close functionality, and implement
  60  * read/write.
  61  *
  62  * We implement three modes of file I/O:
  63  *  - buffered uses the generic_file_aio_{read,write} helpers
  64  *
  65  *  - synchronous is used when there is multi-client read/write
  66  *    sharing, avoids the page cache, and synchronously waits for an
  67  *    ack from the OSD.
  68  *
  69  *  - direct io takes the variant of the sync path that references
  70  *    user pages directly.
  71  *
  72  * fsync() flushes and waits on dirty pages, but just queues metadata
  73  * for writeback: since the MDS can recover size and mtime there is no
  74  * need to wait for MDS acknowledgement.
  75  */
  76
  77 /*
  78  * How many pages to get in one call to iov_iter_get_pages().  This
  79  * determines the size of the on-stack array used as a buffer.
  80  */
  81 #define ITER_GET_BVECS_PAGES    64
  82
  83 static ssize_t __iter_get_bvecs(struct iov_iter *iter, size_t maxsize,
  84                                 struct bio_vec *bvecs)
  85 {
  86         size_t size = 0;
  87         int bvec_idx = 0;
  88
  89         if (maxsize > iov_iter_count(iter))
  90                 maxsize = iov_iter_count(iter);
  91
  92         while (size < maxsize) {
  93                 struct page *pages[ITER_GET_BVECS_PAGES];
  94                 ssize_t bytes;
  95                 size_t start;
  96                 int idx = 0;
  97
  98                 bytes = iov_iter_get_pages(iter, pages, maxsize - size,
  99                                            ITER_GET_BVECS_PAGES, &start);
 100                 if (bytes < 0)
 101                         return size ?: bytes;
 102
 103                 iov_iter_advance(iter, bytes);
 104                 size += bytes;
 105
 106                 for ( ; bytes; idx++, bvec_idx++) {
 107                         struct bio_vec bv = {
 108                                 .bv_page = pages[idx],
 109                                 .bv_len = min_t(int, bytes, PAGE_SIZE - start),
 110                                 .bv_offset = start,
 111                         };
 112
 113                         bvecs[bvec_idx] = bv;
 114                         bytes -= bv.bv_len;
 115                         start = 0;
 116                 }
 117         }
 118
 119         return size;
 120 }
 121
 122 /*
 123  * iov_iter_get_pages() only considers one iov_iter segment, no matter
 124  * what maxsize or maxpages are given.  For ITER_BVEC that is a single
 125  * page.
 126  *
 127  * Attempt to get up to @maxsize bytes worth of pages from @iter.
 128  * Return the number of bytes in the created bio_vec array, or an error.
 129  */
 130 static ssize_t iter_get_bvecs_alloc(struct iov_iter *iter, size_t maxsize,
 131                                     struct bio_vec **bvecs, int *num_bvecs)
 132 {
 133         struct bio_vec *bv;
 134         size_t orig_count = iov_iter_count(iter);
 135         ssize_t bytes;
 136         int npages;
 137
 138         iov_iter_truncate(iter, maxsize);
 139         npages = iov_iter_npages(iter, INT_MAX);
 140         iov_iter_reexpand(iter, orig_count);
 141
 142         /*
 143          * __iter_get_bvecs() may populate only part of the array -- zero it
 144          * out.
 145          */
 146         bv = kvmalloc_array(npages, sizeof(*bv), GFP_KERNEL | __GFP_ZERO);
 147         if (!bv)
 148                 return -ENOMEM;
 149
 150         bytes = __iter_get_bvecs(iter, maxsize, bv);
 151         if (bytes < 0) {
 152                 /*
 153                  * No pages were pinned -- just free the array.
 154                  */
 155                 kvfree(bv);
 156                 return bytes;
 157         }
 158
 159         *bvecs = bv;
 160         *num_bvecs = npages;
 161         return bytes;
 162 }
 163
 164 static void put_bvecs(struct bio_vec *bvecs, int num_bvecs, bool should_dirty)
 165 {
 166         int i;
 167
 168         for (i = 0; i < num_bvecs; i++) {
 169                 if (bvecs[i].bv_page) {
 170                         if (should_dirty)
 171                                 set_page_dirty_lock(bvecs[i].bv_page);
 172                         put_page(bvecs[i].bv_page);
 173                 }
 174         }
 175         kvfree(bvecs);
 176 }
 177
 178 /*
 179  * Prepare an open request.  Preallocate ceph_cap to avoid an
 180  * inopportune ENOMEM later.
 181  */
 182 static struct ceph_mds_request *
 183 prepare_open_request(struct super_block *sb, int flags, int create_mode)
 184 {
 185         struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(sb);
 186         struct ceph_mds_request *req;
 187         int want_auth = USE_ANY_MDS;
 188         int op = (flags & O_CREAT) ? CEPH_MDS_OP_CREATE : CEPH_MDS_OP_OPEN;
 189
 190         if (flags & (O_WRONLY|O_RDWR|O_CREAT|O_TRUNC))
 191                 want_auth = USE_AUTH_MDS;
 192
 193         req = ceph_mdsc_create_request(mdsc, op, want_auth);
 194         if (IS_ERR(req))
 195                 goto out;
 196         req->r_fmode = ceph_flags_to_mode(flags);
 197         req->r_args.open.flags = ceph_flags_sys2wire(flags);
 198         req->r_args.open.mode = cpu_to_le32(create_mode);
 199 out:
 200         return req;
 201 }
 202
 203 static int ceph_init_file_info(struct inode *inode, struct file *file,
 204                                         int fmode, bool isdir)
 205 {
 206         struct ceph_inode_info *ci = ceph_inode(inode);
 207         struct ceph_mount_options *opt =
 208                 ceph_inode_to_client(&ci->vfs_inode)->mount_options;
 209         struct ceph_file_info *fi;
 210         int ret;
 211
 212         dout("%s %p %p 0%o (%s)\n", __func__, inode, file,
 213                         inode->i_mode, isdir ? "dir" : "regular");
 214         BUG_ON(inode->i_fop->release != ceph_release);
 215
 216         if (isdir) {
 217                 struct ceph_dir_file_info *dfi =
 218                         kmem_cache_zalloc(ceph_dir_file_cachep, GFP_KERNEL);
 219                 if (!dfi)
 220                         return -ENOMEM;
 221
 222                 file->private_data = dfi;
 223                 fi = &dfi->file_info;
 224                 dfi->next_offset = 2;
 225                 dfi->readdir_cache_idx = -1;
 226         } else {
 227                 fi = kmem_cache_zalloc(ceph_file_cachep, GFP_KERNEL);
 228                 if (!fi)
 229                         return -ENOMEM;
 230
 231                 if (opt->flags & CEPH_MOUNT_OPT_NOPAGECACHE)
 232                         fi->flags |= CEPH_F_SYNC;
 233
 234                 file->private_data = fi;
 235         }
 236
 237         ceph_get_fmode(ci, fmode, 1);
 238         fi->fmode = fmode;
 239
 240         spin_lock_init(&fi->rw_contexts_lock);
 241         INIT_LIST_HEAD(&fi->rw_contexts);
 242         fi->filp_gen = READ_ONCE(ceph_inode_to_client(inode)->filp_gen);
 243
 244         if ((file->f_mode & FMODE_WRITE) &&
 245             ci->i_inline_version != CEPH_INLINE_NONE) {
 246                 ret = ceph_uninline_data(file);
 247                 if (ret < 0)
 248                         goto error;
 249         }
 250
 251         return 0;
 252
 253 error:
 254         ceph_fscache_unuse_cookie(inode, file->f_mode & FMODE_WRITE);
 255         ceph_put_fmode(ci, fi->fmode, 1);
 256         kmem_cache_free(ceph_file_cachep, fi);
 257         /* wake up anyone waiting for caps on this inode */
 258         wake_up_all(&ci->i_cap_wq);
 259         return ret;
 260 }
 261
 262 /*
 263  * initialize private struct file data.
 264  * if we fail, clean up by dropping fmode reference on the ceph_inode
 265  */
 266 static int ceph_init_file(struct inode *inode, struct file *file, int fmode)
 267 {
 268         int ret = 0;
 269
 270         switch (inode->i_mode & S_IFMT) {
 271         case S_IFREG:
 272                 ceph_fscache_use_cookie(inode, file->f_mode & FMODE_WRITE);
 273                 fallthrough;
 274         case S_IFDIR:
 275                 ret = ceph_init_file_info(inode, file, fmode,
 276                                                 S_ISDIR(inode->i_mode));
 277                 break;
 278
 279         case S_IFLNK:
 280                 dout("init_file %p %p 0%o (symlink)\n", inode, file,
 281                      inode->i_mode);
 282                 break;
 283
 284         default:
 285                 dout("init_file %p %p 0%o (special)\n", inode, file,
 286                      inode->i_mode);
 287                 /*
 288                  * we need to drop the open ref now, since we don't
 289                  * have .release set to ceph_release.
 290                  */
 291                 BUG_ON(inode->i_fop->release == ceph_release);
 292
 293                 /* call the proper open fop */
 294                 ret = inode->i_fop->open(inode, file);
 295         }
 296         return ret;
 297 }
 298
 299 /*
 300  * try renew caps after session gets killed.
 301  */
 302 int ceph_renew_caps(struct inode *inode, int fmode)
 303 {
 304         struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
 305         struct ceph_inode_info *ci = ceph_inode(inode);
 306         struct ceph_mds_request *req;
 307         int err, flags, wanted;
 308
 309         spin_lock(&ci->i_ceph_lock);
 310         __ceph_touch_fmode(ci, mdsc, fmode);
 311         wanted = __ceph_caps_file_wanted(ci);
 312         if (__ceph_is_any_real_caps(ci) &&
 313             (!(wanted & CEPH_CAP_ANY_WR) || ci->i_auth_cap)) {
 314                 int issued = __ceph_caps_issued(ci, NULL);
 315                 spin_unlock(&ci->i_ceph_lock);
 316                 dout("renew caps %p want %s issued %s updating mds_wanted\n",
 317                      inode, ceph_cap_string(wanted), ceph_cap_string(issued));
 318                 ceph_check_caps(ci, 0, NULL);
 319                 return 0;
 320         }
 321         spin_unlock(&ci->i_ceph_lock);
 322
 323         flags = 0;
 324         if ((wanted & CEPH_CAP_FILE_RD) && (wanted & CEPH_CAP_FILE_WR))
 325                 flags = O_RDWR;
 326         else if (wanted & CEPH_CAP_FILE_RD)
 327                 flags = O_RDONLY;
 328         else if (wanted & CEPH_CAP_FILE_WR)
 329                 flags = O_WRONLY;
 330 #ifdef O_LAZY
 331         if (wanted & CEPH_CAP_FILE_LAZYIO)
 332                 flags |= O_LAZY;
 333 #endif
 334
 335         req = prepare_open_request(inode->i_sb, flags, 0);
 336         if (IS_ERR(req)) {
 337                 err = PTR_ERR(req);
 338                 goto out;
 339         }
 340
 341         req->r_inode = inode;
 342         ihold(inode);
 343         req->r_num_caps = 1;
 344
 345         err = ceph_mdsc_do_request(mdsc, NULL, req);
 346         ceph_mdsc_put_request(req);
 347 out:
 348         dout("renew caps %p open result=%d\n", inode, err);
 349         return err < 0 ? err : 0;
 350 }
 351
 352 /*
 353  * If we already have the requisite capabilities, we can satisfy
 354  * the open request locally (no need to request new caps from the
 355  * MDS).  We do, however, need to inform the MDS (asynchronously)
 356  * if our wanted caps set expands.
 357  */
 358 int ceph_open(struct inode *inode, struct file *file)
 359 {
 360         struct ceph_inode_info *ci = ceph_inode(inode);
 361         struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
 362         struct ceph_mds_client *mdsc = fsc->mdsc;
 363         struct ceph_mds_request *req;
 364         struct ceph_file_info *fi = file->private_data;
 365         int err;
 366         int flags, fmode, wanted;
 367
 368         if (fi) {
 369                 dout("open file %p is already opened\n", file);
 370                 return 0;
 371         }
 372
 373         /* filter out O_CREAT|O_EXCL; vfs did that already.  yuck. */
 374         flags = file->f_flags & ~(O_CREAT|O_EXCL);
 375         if (S_ISDIR(inode->i_mode))
 376                 flags = O_DIRECTORY;  /* mds likes to know */
 377
 378         dout("open inode %p ino %llx.%llx file %p flags %d (%d)\n", inode,
 379              ceph_vinop(inode), file, flags, file->f_flags);
 380         fmode = ceph_flags_to_mode(flags);
 381         wanted = ceph_caps_for_mode(fmode);
 382
 383         /* snapped files are read-only */
 384         if (ceph_snap(inode) != CEPH_NOSNAP && (file->f_mode & FMODE_WRITE))
 385                 return -EROFS;
 386
 387         /* trivially open snapdir */
 388         if (ceph_snap(inode) == CEPH_SNAPDIR) {
 389                 return ceph_init_file(inode, file, fmode);
 390         }
 391
 392         /*
 393          * No need to block if we have caps on the auth MDS (for
 394          * write) or any MDS (for read).  Update wanted set
 395          * asynchronously.
 396          */
 397         spin_lock(&ci->i_ceph_lock);
 398         if (__ceph_is_any_real_caps(ci) &&
 399             (((fmode & CEPH_FILE_MODE_WR) == 0) || ci->i_auth_cap)) {
 400                 int mds_wanted = __ceph_caps_mds_wanted(ci, true);
 401                 int issued = __ceph_caps_issued(ci, NULL);
 402
 403                 dout("open %p fmode %d want %s issued %s using existing\n",
 404                      inode, fmode, ceph_cap_string(wanted),
 405                      ceph_cap_string(issued));
 406                 __ceph_touch_fmode(ci, mdsc, fmode);
 407                 spin_unlock(&ci->i_ceph_lock);
 408
 409                 /* adjust wanted? */
 410                 if ((issued & wanted) != wanted &&
 411                     (mds_wanted & wanted) != wanted &&
 412                     ceph_snap(inode) != CEPH_SNAPDIR)
 413                         ceph_check_caps(ci, 0, NULL);
 414
 415                 return ceph_init_file(inode, file, fmode);
 416         } else if (ceph_snap(inode) != CEPH_NOSNAP &&
 417                    (ci->i_snap_caps & wanted) == wanted) {
 418                 __ceph_touch_fmode(ci, mdsc, fmode);
 419                 spin_unlock(&ci->i_ceph_lock);
 420                 return ceph_init_file(inode, file, fmode);
 421         }
 422
 423         spin_unlock(&ci->i_ceph_lock);
 424
 425         dout("open fmode %d wants %s\n", fmode, ceph_cap_string(wanted));
 426         req = prepare_open_request(inode->i_sb, flags, 0);
 427         if (IS_ERR(req)) {
 428                 err = PTR_ERR(req);
 429                 goto out;
 430         }
 431         req->r_inode = inode;
 432         ihold(inode);
 433
 434         req->r_num_caps = 1;
 435         err = ceph_mdsc_do_request(mdsc, NULL, req);
 436         if (!err)
 437                 err = ceph_init_file(inode, file, req->r_fmode);
 438         ceph_mdsc_put_request(req);
 439         dout("open result=%d on %llx.%llx\n", err, ceph_vinop(inode));
 440 out:
 441         return err;
 442 }
 443
 444 /* Clone the layout from a synchronous create, if the dir now has Dc caps */
 445 static void
 446 cache_file_layout(struct inode *dst, struct inode *src)
 447 {
 448         struct ceph_inode_info *cdst = ceph_inode(dst);
 449         struct ceph_inode_info *csrc = ceph_inode(src);
 450
 451         spin_lock(&cdst->i_ceph_lock);
 452         if ((__ceph_caps_issued(cdst, NULL) & CEPH_CAP_DIR_CREATE) &&
 453             !ceph_file_layout_is_valid(&cdst->i_cached_layout)) {
 454                 memcpy(&cdst->i_cached_layout, &csrc->i_layout,
 455                         sizeof(cdst->i_cached_layout));
 456                 rcu_assign_pointer(cdst->i_cached_layout.pool_ns,
 457                                    ceph_try_get_string(csrc->i_layout.pool_ns));
 458         }
 459         spin_unlock(&cdst->i_ceph_lock);
 460 }
 461
 462 /*
 463  * Try to set up an async create. We need caps, a file layout, and inode number,
 464  * and either a lease on the dentry or complete dir info. If any of those
 465  * criteria are not satisfied, then return false and the caller can go
 466  * synchronous.
 467  */
 468 static int try_prep_async_create(struct inode *dir, struct dentry *dentry,
 469                                  struct ceph_file_layout *lo, u64 *pino)
 470 {
 471         struct ceph_inode_info *ci = ceph_inode(dir);
 472         struct ceph_dentry_info *di = ceph_dentry(dentry);
 473         int got = 0, want = CEPH_CAP_FILE_EXCL | CEPH_CAP_DIR_CREATE;
 474         u64 ino;
 475
 476         spin_lock(&ci->i_ceph_lock);
 477         /* No auth cap means no chance for Dc caps */
 478         if (!ci->i_auth_cap)
 479                 goto no_async;
 480
 481         /* Any delegated inos? */
 482         if (xa_empty(&ci->i_auth_cap->session->s_delegated_inos))
 483                 goto no_async;
 484
 485         if (!ceph_file_layout_is_valid(&ci->i_cached_layout))
 486                 goto no_async;
 487
 488         if ((__ceph_caps_issued(ci, NULL) & want) != want)
 489                 goto no_async;
 490
 491         if (d_in_lookup(dentry)) {
 492                 if (!__ceph_dir_is_complete(ci))
 493                         goto no_async;
 494                 spin_lock(&dentry->d_lock);
 495                 di->lease_shared_gen = atomic_read(&ci->i_shared_gen);
 496                 spin_unlock(&dentry->d_lock);
 497         } else if (atomic_read(&ci->i_shared_gen) !=
 498                    READ_ONCE(di->lease_shared_gen)) {
 499                 goto no_async;
 500         }
 501
 502         ino = ceph_get_deleg_ino(ci->i_auth_cap->session);
 503         if (!ino)
 504                 goto no_async;
 505
 506         *pino = ino;
 507         ceph_take_cap_refs(ci, want, false);
 508         memcpy(lo, &ci->i_cached_layout, sizeof(*lo));
 509         rcu_assign_pointer(lo->pool_ns,
 510                            ceph_try_get_string(ci->i_cached_layout.pool_ns));
 511         got = want;
 512 no_async:
 513         spin_unlock(&ci->i_ceph_lock);
 514         return got;
 515 }
 516
 517 static void restore_deleg_ino(struct inode *dir, u64 ino)
 518 {
 519         struct ceph_inode_info *ci = ceph_inode(dir);
 520         struct ceph_mds_session *s = NULL;
 521
 522         spin_lock(&ci->i_ceph_lock);
 523         if (ci->i_auth_cap)
 524                 s = ceph_get_mds_session(ci->i_auth_cap->session);
 525         spin_unlock(&ci->i_ceph_lock);
 526         if (s) {
 527                 int err = ceph_restore_deleg_ino(s, ino);
 528                 if (err)
 529                         pr_warn("ceph: unable to restore delegated ino 0x%llx to session: %d\n",
 530                                 ino, err);
 531                 ceph_put_mds_session(s);
 532         }
 533 }
 534
 535 static void wake_async_create_waiters(struct inode *inode,
 536                                       struct ceph_mds_session *session)
 537 {
 538         struct ceph_inode_info *ci = ceph_inode(inode);
 539
 540         spin_lock(&ci->i_ceph_lock);
 541         if (ci->i_ceph_flags & CEPH_I_ASYNC_CREATE) {
 542                 ci->i_ceph_flags &= ~CEPH_I_ASYNC_CREATE;
 543                 wake_up_bit(&ci->i_ceph_flags, CEPH_ASYNC_CREATE_BIT);
 544         }
 545         ceph_kick_flushing_inode_caps(session, ci);
 546         spin_unlock(&ci->i_ceph_lock);
 547 }
 548
 549 static void ceph_async_create_cb(struct ceph_mds_client *mdsc,
 550                                  struct ceph_mds_request *req)
 551 {
 552         struct dentry *dentry = req->r_dentry;
 553         struct inode *dinode = d_inode(dentry);
 554         struct inode *tinode = req->r_target_inode;
 555         int result = req->r_err ? req->r_err :
 556                         le32_to_cpu(req->r_reply_info.head->result);
 557
 558         WARN_ON_ONCE(dinode && tinode && dinode != tinode);
 559
 560         /* MDS changed -- caller must resubmit */
 561         if (result == -EJUKEBOX)
 562                 goto out;
 563
 564         mapping_set_error(req->r_parent->i_mapping, result);
 565
 566         if (result) {
 567                 int pathlen = 0;
 568                 u64 base = 0;
 569                 char *path = ceph_mdsc_build_path(req->r_dentry, &pathlen,
 570                                                   &base, 0);
 571
 572                 pr_warn("ceph: async create failure path=(%llx)%s result=%d!\n",
 573                         base, IS_ERR(path) ? "<<bad>>" : path, result);
 574                 ceph_mdsc_free_path(path, pathlen);
 575
 576                 ceph_dir_clear_complete(req->r_parent);
 577                 if (!d_unhashed(dentry))
 578                         d_drop(dentry);
 579
 580                 if (dinode) {
 581                         mapping_set_error(dinode->i_mapping, result);
 582                         ceph_inode_shutdown(dinode);
 583                         wake_async_create_waiters(dinode, req->r_session);
 584                 }
 585         }
 586
 587         if (tinode) {
 588                 u64 ino = ceph_vino(tinode).ino;
 589
 590                 if (req->r_deleg_ino != ino)
 591                         pr_warn("%s: inode number mismatch! err=%d deleg_ino=0x%llx target=0x%llx\n",
 592                                 __func__, req->r_err, req->r_deleg_ino, ino);
 593
 594                 mapping_set_error(tinode->i_mapping, result);
 595                 wake_async_create_waiters(tinode, req->r_session);
 596         } else if (!result) {
 597                 pr_warn("%s: no req->r_target_inode for 0x%llx\n", __func__,
 598                         req->r_deleg_ino);
 599         }
 600 out:
 601         ceph_mdsc_release_dir_caps(req);
 602 }
 603
 604 static int ceph_finish_async_create(struct inode *dir, struct dentry *dentry,
 605                                     struct file *file, umode_t mode,
 606                                     struct ceph_mds_request *req,
 607                                     struct ceph_acl_sec_ctx *as_ctx,
 608                                     struct ceph_file_layout *lo)
 609 {
 610         int ret;
 611         char xattr_buf[4];
 612         struct ceph_mds_reply_inode in = { };
 613         struct ceph_mds_reply_info_in iinfo = { .in = &in };
 614         struct ceph_inode_info *ci = ceph_inode(dir);
 615         struct inode *inode;
 616         struct timespec64 now;
 617         struct ceph_string *pool_ns;
 618         struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb);
 619         struct ceph_vino vino = { .ino = req->r_deleg_ino,
 620                                   .snap = CEPH_NOSNAP };
 621
 622         ktime_get_real_ts64(&now);
 623
 624         inode = ceph_get_inode(dentry->d_sb, vino);
 625         if (IS_ERR(inode))
 626                 return PTR_ERR(inode);
 627
 628         iinfo.inline_version = CEPH_INLINE_NONE;
 629         iinfo.change_attr = 1;
 630         ceph_encode_timespec64(&iinfo.btime, &now);
 631
 632         iinfo.xattr_len = ARRAY_SIZE(xattr_buf);
 633         iinfo.xattr_data = xattr_buf;
 634         memset(iinfo.xattr_data, 0, iinfo.xattr_len);
 635
 636         in.ino = cpu_to_le64(vino.ino);
 637         in.snapid = cpu_to_le64(CEPH_NOSNAP);
 638         in.version = cpu_to_le64(1);    // ???
 639         in.cap.caps = in.cap.wanted = cpu_to_le32(CEPH_CAP_ALL_FILE);
 640         in.cap.cap_id = cpu_to_le64(1);
 641         in.cap.realm = cpu_to_le64(ci->i_snap_realm->ino);
 642         in.cap.flags = CEPH_CAP_FLAG_AUTH;
 643         in.ctime = in.mtime = in.atime = iinfo.btime;
 644         in.truncate_seq = cpu_to_le32(1);
 645         in.truncate_size = cpu_to_le64(-1ULL);
 646         in.xattr_version = cpu_to_le64(1);
 647         in.uid = cpu_to_le32(from_kuid(&init_user_ns, current_fsuid()));
 648         if (dir->i_mode & S_ISGID) {
 649                 in.gid = cpu_to_le32(from_kgid(&init_user_ns, dir->i_gid));
 650
 651                 /* Directories always inherit the setgid bit. */
 652                 if (S_ISDIR(mode))
 653                         mode |= S_ISGID;
 654                 else if ((mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP) &&
 655                          !in_group_p(dir->i_gid) &&
 656                          !capable_wrt_inode_uidgid(&init_user_ns, dir, CAP_FSETID))
 657                         mode &= ~S_ISGID;
 658         } else {
 659                 in.gid = cpu_to_le32(from_kgid(&init_user_ns, current_fsgid()));
 660         }
 661         in.mode = cpu_to_le32((u32)mode);
 662
 663         in.nlink = cpu_to_le32(1);
 664         in.max_size = cpu_to_le64(lo->stripe_unit);
 665
 666         ceph_file_layout_to_legacy(lo, &in.layout);
 667         /* lo is private, so pool_ns can't change */
 668         pool_ns = rcu_dereference_raw(lo->pool_ns);
 669         if (pool_ns) {
 670                 iinfo.pool_ns_len = pool_ns->len;
 671                 iinfo.pool_ns_data = pool_ns->str;
 672         }
 673
 674         down_read(&mdsc->snap_rwsem);
 675         ret = ceph_fill_inode(inode, NULL, &iinfo, NULL, req->r_session,
 676                               req->r_fmode, NULL);
 677         up_read(&mdsc->snap_rwsem);
 678         if (ret) {
 679                 dout("%s failed to fill inode: %d\n", __func__, ret);
 680                 ceph_dir_clear_complete(dir);
 681                 if (!d_unhashed(dentry))
 682                         d_drop(dentry);
 683                 if (inode->i_state & I_NEW)
 684                         discard_new_inode(inode);
 685         } else {
 686                 struct dentry *dn;
 687
 688                 dout("%s d_adding new inode 0x%llx to 0x%llx/%s\n", __func__,
 689                         vino.ino, ceph_ino(dir), dentry->d_name.name);
 690                 ceph_dir_clear_ordered(dir);
 691                 ceph_init_inode_acls(inode, as_ctx);
 692                 if (inode->i_state & I_NEW) {
 693                         /*
 694                          * If it's not I_NEW, then someone created this before
 695                          * we got here. Assume the server is aware of it at
 696                          * that point and don't worry about setting
 697                          * CEPH_I_ASYNC_CREATE.
 698                          */
 699                         ceph_inode(inode)->i_ceph_flags = CEPH_I_ASYNC_CREATE;
 700                         unlock_new_inode(inode);
 701                 }
 702                 if (d_in_lookup(dentry) || d_really_is_negative(dentry)) {
 703                         if (!d_unhashed(dentry))
 704                                 d_drop(dentry);
 705                         dn = d_splice_alias(inode, dentry);
 706                         WARN_ON_ONCE(dn && dn != dentry);
 707                 }
 708                 file->f_mode |= FMODE_CREATED;
 709                 ret = finish_open(file, dentry, ceph_open);
 710         }
 711         return ret;
 712 }
 713
 714 /*
 715  * Do a lookup + open with a single request.  If we get a non-existent
 716  * file or symlink, return 1 so the VFS can retry.
 717  */
 718 int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
 719                      struct file *file, unsigned flags, umode_t mode)
 720 {
 721         struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
 722         struct ceph_mds_client *mdsc = fsc->mdsc;
 723         struct ceph_mds_request *req;
 724         struct dentry *dn;
 725         struct ceph_acl_sec_ctx as_ctx = {};
 726         bool try_async = ceph_test_mount_opt(fsc, ASYNC_DIROPS);
 727         int mask;
 728         int err;
 729
 730         dout("atomic_open %p dentry %p '%pd' %s flags %d mode 0%o\n",
 731              dir, dentry, dentry,
 732              d_unhashed(dentry) ? "unhashed" : "hashed", flags, mode);
 733
 734         if (dentry->d_name.len > NAME_MAX)
 735                 return -ENAMETOOLONG;
 736
 737         if (flags & O_CREAT) {
 738                 if (ceph_quota_is_max_files_exceeded(dir))
 739                         return -EDQUOT;
 740                 err = ceph_pre_init_acls(dir, &mode, &as_ctx);
 741                 if (err < 0)
 742                         return err;
 743                 err = ceph_security_init_secctx(dentry, mode, &as_ctx);
 744                 if (err < 0)
 745                         goto out_ctx;
 746         } else if (!d_in_lookup(dentry)) {
 747                 /* If it's not being looked up, it's negative */
 748                 return -ENOENT;
 749         }
 750 retry:
 751         /* do the open */
 752         req = prepare_open_request(dir->i_sb, flags, mode);
 753         if (IS_ERR(req)) {
 754                 err = PTR_ERR(req);
 755                 goto out_ctx;
 756         }
 757         req->r_dentry = dget(dentry);
 758         req->r_num_caps = 2;
 759         mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
 760         if (ceph_security_xattr_wanted(dir))
 761                 mask |= CEPH_CAP_XATTR_SHARED;
 762         req->r_args.open.mask = cpu_to_le32(mask);
 763         req->r_parent = dir;
 764         ihold(dir);
 765
 766         if (flags & O_CREAT) {
 767                 struct ceph_file_layout lo;
 768
 769                 req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL;
 770                 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
 771                 if (as_ctx.pagelist) {
 772                         req->r_pagelist = as_ctx.pagelist;
 773                         as_ctx.pagelist = NULL;
 774                 }
 775                 if (try_async &&
 776                     (req->r_dir_caps =
 777                       try_prep_async_create(dir, dentry, &lo,
 778                                             &req->r_deleg_ino))) {
 779                         set_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags);
 780                         req->r_args.open.flags |= cpu_to_le32(CEPH_O_EXCL);
 781                         req->r_callback = ceph_async_create_cb;
 782                         err = ceph_mdsc_submit_request(mdsc, dir, req);
 783                         if (!err) {
 784                                 err = ceph_finish_async_create(dir, dentry,
 785                                                         file, mode, req,
 786                                                         &as_ctx, &lo);
 787                         } else if (err == -EJUKEBOX) {
 788                                 restore_deleg_ino(dir, req->r_deleg_ino);
 789                                 ceph_mdsc_put_request(req);
 790                                 try_async = false;
 791                                 ceph_put_string(rcu_dereference_raw(lo.pool_ns));
 792                                 goto retry;
 793                         }
 794                         ceph_put_string(rcu_dereference_raw(lo.pool_ns));
 795                         goto out_req;
 796                 }
 797         }
 798
 799         set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
 800         err = ceph_mdsc_do_request(mdsc,
 801                                    (flags & (O_CREAT|O_TRUNC)) ? dir : NULL,
 802                                    req);
 803         if (err == -ENOENT) {
 804                 dentry = ceph_handle_snapdir(req, dentry);
 805                 if (IS_ERR(dentry)) {
 806                         err = PTR_ERR(dentry);
 807                         goto out_req;
 808                 }
 809                 err = 0;
 810         }
 811
 812         if (!err && (flags & O_CREAT) && !req->r_reply_info.head->is_dentry)
 813                 err = ceph_handle_notrace_create(dir, dentry);
 814
 815         if (d_in_lookup(dentry)) {
 816                 dn = ceph_finish_lookup(req, dentry, err);
 817                 if (IS_ERR(dn))
 818                         err = PTR_ERR(dn);
 819         } else {
 820                 /* we were given a hashed negative dentry */
 821                 dn = NULL;
 822         }
 823         if (err)
 824                 goto out_req;
 825         if (dn || d_really_is_negative(dentry) || d_is_symlink(dentry)) {
 826                 /* make vfs retry on splice, ENOENT, or symlink */
 827                 dout("atomic_open finish_no_open on dn %p\n", dn);
 828                 err = finish_no_open(file, dn);
 829         } else {
 830                 dout("atomic_open finish_open on dn %p\n", dn);
 831                 if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) {
 832                         struct inode *newino = d_inode(dentry);
 833
 834                         cache_file_layout(dir, newino);
 835                         ceph_init_inode_acls(newino, &as_ctx);
 836                         file->f_mode |= FMODE_CREATED;
 837                 }
 838                 err = finish_open(file, dentry, ceph_open);
 839         }
 840 out_req:
 841         ceph_mdsc_put_request(req);
 842 out_ctx:
 843         ceph_release_acl_sec_ctx(&as_ctx);
 844         dout("atomic_open result=%d\n", err);
 845         return err;
 846 }
 847
 848 int ceph_release(struct inode *inode, struct file *file)
 849 {
 850         struct ceph_inode_info *ci = ceph_inode(inode);
 851
 852         if (S_ISDIR(inode->i_mode)) {
 853                 struct ceph_dir_file_info *dfi = file->private_data;
 854                 dout("release inode %p dir file %p\n", inode, file);
 855                 WARN_ON(!list_empty(&dfi->file_info.rw_contexts));
 856
 857                 ceph_put_fmode(ci, dfi->file_info.fmode, 1);
 858
 859                 if (dfi->last_readdir)
 860                         ceph_mdsc_put_request(dfi->last_readdir);
 861                 kfree(dfi->last_name);
 862                 kfree(dfi->dir_info);
 863                 kmem_cache_free(ceph_dir_file_cachep, dfi);
 864         } else {
 865                 struct ceph_file_info *fi = file->private_data;
 866                 dout("release inode %p regular file %p\n", inode, file);
 867                 WARN_ON(!list_empty(&fi->rw_contexts));
 868
 869                 ceph_fscache_unuse_cookie(inode, file->f_mode & FMODE_WRITE);
 870                 ceph_put_fmode(ci, fi->fmode, 1);
 871
 872                 kmem_cache_free(ceph_file_cachep, fi);
 873         }
 874
 875         /* wake up anyone waiting for caps on this inode */
 876         wake_up_all(&ci->i_cap_wq);
 877         return 0;
 878 }
 879
 880 enum {
 881         HAVE_RETRIED = 1,
 882         CHECK_EOF =    2,
 883         READ_INLINE =  3,
 884 };
 885
 886 /*
 887  * Completely synchronous read and write methods.  Direct from __user
 888  * buffer to osd, or directly to user pages (if O_DIRECT).
 889  *
 890  * If the read spans object boundary, just do multiple reads.  (That's not
 891  * atomic, but good enough for now.)
 892  *
 893  * If we get a short result from the OSD, check against i_size; we need to
 894  * only return a short read to the caller if we hit EOF.
 895  */
 896 static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *to,
 897                               int *retry_op)
 898 {
 899         struct file *file = iocb->ki_filp;
 900         struct inode *inode = file_inode(file);
 901         struct ceph_inode_info *ci = ceph_inode(inode);
 902         struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
 903         struct ceph_osd_client *osdc = &fsc->client->osdc;
 904         ssize_t ret;
 905         u64 off = iocb->ki_pos;
 906         u64 len = iov_iter_count(to);
 907         u64 i_size = i_size_read(inode);
 908
 909         dout("sync_read on file %p %llu~%u %s\n", file, off, (unsigned)len,
 910              (file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
 911
 912         if (!len)
 913                 return 0;
 914         /*
 915          * flush any page cache pages in this range.  this
 916          * will make concurrent normal and sync io slow,
 917          * but it will at least behave sensibly when they are
 918          * in sequence.
 919          */
 920         ret = filemap_write_and_wait_range(inode->i_mapping,
 921                                            off, off + len - 1);
 922         if (ret < 0)
 923                 return ret;
 924
 925         ret = 0;
 926         while ((len = iov_iter_count(to)) > 0) {
 927                 struct ceph_osd_request *req;
 928                 struct page **pages;
 929                 int num_pages;
 930                 size_t page_off;
 931                 bool more;
 932                 int idx;
 933                 size_t left;
 934
 935                 req = ceph_osdc_new_request(osdc, &ci->i_layout,
 936                                         ci->i_vino, off, &len, 0, 1,
 937                                         CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
 938                                         NULL, ci->i_truncate_seq,
 939                                         ci->i_truncate_size, false);
 940                 if (IS_ERR(req)) {
 941                         ret = PTR_ERR(req);
 942                         break;
 943                 }
 944
 945                 more = len < iov_iter_count(to);
 946
 947                 num_pages = calc_pages_for(off, len);
 948                 page_off = off & ~PAGE_MASK;
 949                 pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
 950                 if (IS_ERR(pages)) {
 951                         ceph_osdc_put_request(req);
 952                         ret = PTR_ERR(pages);
 953                         break;
 954                 }
 955
 956                 osd_req_op_extent_osd_data_pages(req, 0, pages, len, page_off,
 957                                                  false, false);
 958                 ret = ceph_osdc_start_request(osdc, req, false);
 959                 if (!ret)
 960                         ret = ceph_osdc_wait_request(osdc, req);
 961
 962                 ceph_update_read_metrics(&fsc->mdsc->metric,
 963                                          req->r_start_latency,
 964                                          req->r_end_latency,
 965                                          len, ret);
 966
 967                 ceph_osdc_put_request(req);
 968
 969                 i_size = i_size_read(inode);
 970                 dout("sync_read %llu~%llu got %zd i_size %llu%s\n",
 971                      off, len, ret, i_size, (more ? " MORE" : ""));
 972
 973                 if (ret == -ENOENT)
 974                         ret = 0;
 975                 if (ret >= 0 && ret < len && (off + ret < i_size)) {
 976                         int zlen = min(len - ret, i_size - off - ret);
 977                         int zoff = page_off + ret;
 978                         dout("sync_read zero gap %llu~%llu\n",
 979                              off + ret, off + ret + zlen);
 980                         ceph_zero_page_vector_range(zoff, zlen, pages);
 981                         ret += zlen;
 982                 }
 983
 984                 idx = 0;
 985                 left = ret > 0 ? ret : 0;
 986                 while (left > 0) {
 987                         size_t len, copied;
 988                         page_off = off & ~PAGE_MASK;
 989                         len = min_t(size_t, left, PAGE_SIZE - page_off);
 990                         SetPageUptodate(pages[idx]);
 991                         copied = copy_page_to_iter(pages[idx++],
 992                                                    page_off, len, to);
 993                         off += copied;
 994                         left -= copied;
 995                         if (copied < len) {
 996                                 ret = -EFAULT;
 997                                 break;
 998                         }
 999                 }
1000                 ceph_release_page_vector(pages, num_pages);
1001
1002                 if (ret < 0) {
1003                         if (ret == -EBLOCKLISTED)
1004                                 fsc->blocklisted = true;
1005                         break;
1006                 }
1007
1008                 if (off >= i_size || !more)
1009                         break;
1010         }
1011
1012         if (off > iocb->ki_pos) {
1013                 if (off >= i_size) {
1014                         *retry_op = CHECK_EOF;
1015                         ret = i_size - iocb->ki_pos;
1016                         iocb->ki_pos = i_size;
1017                 } else {
1018                         ret = off - iocb->ki_pos;
1019                         iocb->ki_pos = off;
1020                 }
1021         }
1022
1023         dout("sync_read result %zd retry_op %d\n", ret, *retry_op);
1024         return ret;
1025 }
1026
1027 struct ceph_aio_request {
1028         struct kiocb *iocb;
1029         size_t total_len;
1030         bool write;
1031         bool should_dirty;
1032         int error;
1033         struct list_head osd_reqs;
1034         unsigned num_reqs;
1035         atomic_t pending_reqs;
1036         struct timespec64 mtime;
1037         struct ceph_cap_flush *prealloc_cf;
1038 };
1039
1040 struct ceph_aio_work {
1041         struct work_struct work;
1042         struct ceph_osd_request *req;
1043 };
1044
1045 static void ceph_aio_retry_work(struct work_struct *work);
1046
1047 static void ceph_aio_complete(struct inode *inode,
1048                               struct ceph_aio_request *aio_req)
1049 {
1050         struct ceph_inode_info *ci = ceph_inode(inode);
1051         int ret;
1052
1053         if (!atomic_dec_and_test(&aio_req->pending_reqs))
1054                 return;
1055
1056         if (aio_req->iocb->ki_flags & IOCB_DIRECT)
1057                 inode_dio_end(inode);
1058
1059         ret = aio_req->error;
1060         if (!ret)
1061                 ret = aio_req->total_len;
1062
1063         dout("ceph_aio_complete %p rc %d\n", inode, ret);
1064
1065         if (ret >= 0 && aio_req->write) {
1066                 int dirty;
1067
1068                 loff_t endoff = aio_req->iocb->ki_pos + aio_req->total_len;
1069                 if (endoff > i_size_read(inode)) {
1070                         if (ceph_inode_set_size(inode, endoff))
1071                                 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1072                 }
1073
1074                 spin_lock(&ci->i_ceph_lock);
1075                 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1076                                                &aio_req->prealloc_cf);
1077                 spin_unlock(&ci->i_ceph_lock);
1078                 if (dirty)
1079                         __mark_inode_dirty(inode, dirty);
1080
1081         }
1082
1083         ceph_put_cap_refs(ci, (aio_req->write ? CEPH_CAP_FILE_WR :
1084                                                 CEPH_CAP_FILE_RD));
1085
1086         aio_req->iocb->ki_complete(aio_req->iocb, ret);
1087
1088         ceph_free_cap_flush(aio_req->prealloc_cf);
1089         kfree(aio_req);
1090 }
1091
1092 static void ceph_aio_complete_req(struct ceph_osd_request *req)
1093 {
1094         int rc = req->r_result;
1095         struct inode *inode = req->r_inode;
1096         struct ceph_aio_request *aio_req = req->r_priv;
1097         struct ceph_osd_data *osd_data = osd_req_op_extent_osd_data(req, 0);
1098         struct ceph_client_metric *metric = &ceph_sb_to_mdsc(inode->i_sb)->metric;
1099         unsigned int len = osd_data->bvec_pos.iter.bi_size;
1100
1101         BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_BVECS);
1102         BUG_ON(!osd_data->num_bvecs);
1103
1104         dout("ceph_aio_complete_req %p rc %d bytes %u\n", inode, rc, len);
1105
1106         if (rc == -EOLDSNAPC) {
1107                 struct ceph_aio_work *aio_work;
1108                 BUG_ON(!aio_req->write);
1109
1110                 aio_work = kmalloc(sizeof(*aio_work), GFP_NOFS);
1111                 if (aio_work) {
1112                         INIT_WORK(&aio_work->work, ceph_aio_retry_work);
1113                         aio_work->req = req;
1114                         queue_work(ceph_inode_to_client(inode)->inode_wq,
1115                                    &aio_work->work);
1116                         return;
1117                 }
1118                 rc = -ENOMEM;
1119         } else if (!aio_req->write) {
1120                 if (rc == -ENOENT)
1121                         rc = 0;
1122                 if (rc >= 0 && len > rc) {
1123                         struct iov_iter i;
1124                         int zlen = len - rc;
1125
1126                         /*
1127                          * If read is satisfied by single OSD request,
1128                          * it can pass EOF. Otherwise read is within
1129                          * i_size.
1130                          */
1131                         if (aio_req->num_reqs == 1) {
1132                                 loff_t i_size = i_size_read(inode);
1133                                 loff_t endoff = aio_req->iocb->ki_pos + rc;
1134                                 if (endoff < i_size)
1135                                         zlen = min_t(size_t, zlen,
1136                                                      i_size - endoff);
1137                                 aio_req->total_len = rc + zlen;
1138                         }
1139
1140                         iov_iter_bvec(&i, READ, osd_data->bvec_pos.bvecs,
1141                                       osd_data->num_bvecs, len);
1142                         iov_iter_advance(&i, rc);
1143                         iov_iter_zero(zlen, &i);
1144                 }
1145         }
1146
1147         /* r_start_latency == 0 means the request was not submitted */
1148         if (req->r_start_latency) {
1149                 if (aio_req->write)
1150                         ceph_update_write_metrics(metric, req->r_start_latency,
1151                                                   req->r_end_latency, len, rc);
1152                 else
1153                         ceph_update_read_metrics(metric, req->r_start_latency,
1154                                                  req->r_end_latency, len, rc);
1155         }
1156
1157         put_bvecs(osd_data->bvec_pos.bvecs, osd_data->num_bvecs,
1158                   aio_req->should_dirty);
1159         ceph_osdc_put_request(req);
1160
1161         if (rc < 0)
1162                 cmpxchg(&aio_req->error, 0, rc);
1163
1164         ceph_aio_complete(inode, aio_req);
1165         return;
1166 }
1167
1168 static void ceph_aio_retry_work(struct work_struct *work)
1169 {
1170         struct ceph_aio_work *aio_work =
1171                 container_of(work, struct ceph_aio_work, work);
1172         struct ceph_osd_request *orig_req = aio_work->req;
1173         struct ceph_aio_request *aio_req = orig_req->r_priv;
1174         struct inode *inode = orig_req->r_inode;
1175         struct ceph_inode_info *ci = ceph_inode(inode);
1176         struct ceph_snap_context *snapc;
1177         struct ceph_osd_request *req;
1178         int ret;
1179
1180         spin_lock(&ci->i_ceph_lock);
1181         if (__ceph_have_pending_cap_snap(ci)) {
1182                 struct ceph_cap_snap *capsnap =
1183                         list_last_entry(&ci->i_cap_snaps,
1184                                         struct ceph_cap_snap,
1185                                         ci_item);
1186                 snapc = ceph_get_snap_context(capsnap->context);
1187         } else {
1188                 BUG_ON(!ci->i_head_snapc);
1189                 snapc = ceph_get_snap_context(ci->i_head_snapc);
1190         }
1191         spin_unlock(&ci->i_ceph_lock);
1192
1193         req = ceph_osdc_alloc_request(orig_req->r_osdc, snapc, 1,
1194                         false, GFP_NOFS);
1195         if (!req) {
1196                 ret = -ENOMEM;
1197                 req = orig_req;
1198                 goto out;
1199         }
1200
1201         req->r_flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE;
1202         ceph_oloc_copy(&req->r_base_oloc, &orig_req->r_base_oloc);
1203         ceph_oid_copy(&req->r_base_oid, &orig_req->r_base_oid);
1204
1205         req->r_ops[0] = orig_req->r_ops[0];
1206
1207         req->r_mtime = aio_req->mtime;
1208         req->r_data_offset = req->r_ops[0].extent.offset;
1209
1210         ret = ceph_osdc_alloc_messages(req, GFP_NOFS);
1211         if (ret) {
1212                 ceph_osdc_put_request(req);
1213                 req = orig_req;
1214                 goto out;
1215         }
1216
1217         ceph_osdc_put_request(orig_req);
1218
1219         req->r_callback = ceph_aio_complete_req;
1220         req->r_inode = inode;
1221         req->r_priv = aio_req;
1222
1223         ret = ceph_osdc_start_request(req->r_osdc, req, false);
1224 out:
1225         if (ret < 0) {
1226                 req->r_result = ret;
1227                 ceph_aio_complete_req(req);
1228         }
1229
1230         ceph_put_snap_context(snapc);
1231         kfree(aio_work);
1232 }
1233
1234 static ssize_t
1235 ceph_direct_read_write(struct kiocb *iocb, struct iov_iter *iter,
1236                        struct ceph_snap_context *snapc,
1237                        struct ceph_cap_flush **pcf)
1238 {
1239         struct file *file = iocb->ki_filp;
1240         struct inode *inode = file_inode(file);
1241         struct ceph_inode_info *ci = ceph_inode(inode);
1242         struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1243         struct ceph_client_metric *metric = &fsc->mdsc->metric;
1244         struct ceph_vino vino;
1245         struct ceph_osd_request *req;
1246         struct bio_vec *bvecs;
1247         struct ceph_aio_request *aio_req = NULL;
1248         int num_pages = 0;
1249         int flags;
1250         int ret = 0;
1251         struct timespec64 mtime = current_time(inode);
1252         size_t count = iov_iter_count(iter);
1253         loff_t pos = iocb->ki_pos;
1254         bool write = iov_iter_rw(iter) == WRITE;
1255         bool should_dirty = !write && iter_is_iovec(iter);
1256
1257         if (write && ceph_snap(file_inode(file)) != CEPH_NOSNAP)
1258                 return -EROFS;
1259
1260         dout("sync_direct_%s on file %p %lld~%u snapc %p seq %lld\n",
1261              (write ? "write" : "read"), file, pos, (unsigned)count,
1262              snapc, snapc ? snapc->seq : 0);
1263
1264         if (write) {
1265                 int ret2;
1266
1267                 ceph_fscache_invalidate(inode, true);
1268
1269                 ret2 = invalidate_inode_pages2_range(inode->i_mapping,
1270                                         pos >> PAGE_SHIFT,
1271                                         (pos + count - 1) >> PAGE_SHIFT);
1272                 if (ret2 < 0)
1273                         dout("invalidate_inode_pages2_range returned %d\n", ret2);
1274
1275                 flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE;
1276         } else {
1277                 flags = CEPH_OSD_FLAG_READ;
1278         }
1279
1280         while (iov_iter_count(iter) > 0) {
1281                 u64 size = iov_iter_count(iter);
1282                 ssize_t len;
1283
1284                 if (write)
1285                         size = min_t(u64, size, fsc->mount_options->wsize);
1286                 else
1287                         size = min_t(u64, size, fsc->mount_options->rsize);
1288
1289                 vino = ceph_vino(inode);
1290                 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1291                                             vino, pos, &size, 0,
1292                                             1,
1293                                             write ? CEPH_OSD_OP_WRITE :
1294                                                     CEPH_OSD_OP_READ,
1295                                             flags, snapc,
1296                                             ci->i_truncate_seq,
1297                                             ci->i_truncate_size,
1298                                             false);
1299                 if (IS_ERR(req)) {
1300                         ret = PTR_ERR(req);
1301                         break;
1302                 }
1303
1304                 len = iter_get_bvecs_alloc(iter, size, &bvecs, &num_pages);
1305                 if (len < 0) {
1306                         ceph_osdc_put_request(req);
1307                         ret = len;
1308                         break;
1309                 }
1310                 if (len != size)
1311                         osd_req_op_extent_update(req, 0, len);
1312
1313                 /*
1314                  * To simplify error handling, allow AIO when IO within i_size
1315                  * or IO can be satisfied by single OSD request.
1316                  */
1317                 if (pos == iocb->ki_pos && !is_sync_kiocb(iocb) &&
1318                     (len == count || pos + count <= i_size_read(inode))) {
1319                         aio_req = kzalloc(sizeof(*aio_req), GFP_KERNEL);
1320                         if (aio_req) {
1321                                 aio_req->iocb = iocb;
1322                                 aio_req->write = write;
1323                                 aio_req->should_dirty = should_dirty;
1324                                 INIT_LIST_HEAD(&aio_req->osd_reqs);
1325                                 if (write) {
1326                                         aio_req->mtime = mtime;
1327                                         swap(aio_req->prealloc_cf, *pcf);
1328                                 }
1329                         }
1330                         /* ignore error */
1331                 }
1332
1333                 if (write) {
1334                         /*
1335                          * throw out any page cache pages in this range. this
1336                          * may block.
1337                          */
1338                         truncate_inode_pages_range(inode->i_mapping, pos,
1339                                                    PAGE_ALIGN(pos + len) - 1);
1340
1341                         req->r_mtime = mtime;
1342                 }
1343
1344                 osd_req_op_extent_osd_data_bvecs(req, 0, bvecs, num_pages, len);
1345
1346                 if (aio_req) {
1347                         aio_req->total_len += len;
1348                         aio_req->num_reqs++;
1349                         atomic_inc(&aio_req->pending_reqs);
1350
1351                         req->r_callback = ceph_aio_complete_req;
1352                         req->r_inode = inode;
1353                         req->r_priv = aio_req;
1354                         list_add_tail(&req->r_private_item, &aio_req->osd_reqs);
1355
1356                         pos += len;
1357                         continue;
1358                 }
1359
1360                 ret = ceph_osdc_start_request(req->r_osdc, req, false);
1361                 if (!ret)
1362                         ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1363
1364                 if (write)
1365                         ceph_update_write_metrics(metric, req->r_start_latency,
1366                                                   req->r_end_latency, len, ret);
1367                 else
1368                         ceph_update_read_metrics(metric, req->r_start_latency,
1369                                                  req->r_end_latency, len, ret);
1370
1371                 size = i_size_read(inode);
1372                 if (!write) {
1373                         if (ret == -ENOENT)
1374                                 ret = 0;
1375                         if (ret >= 0 && ret < len && pos + ret < size) {
1376                                 struct iov_iter i;
1377                                 int zlen = min_t(size_t, len - ret,
1378                                                  size - pos - ret);
1379
1380                                 iov_iter_bvec(&i, READ, bvecs, num_pages, len);
1381                                 iov_iter_advance(&i, ret);
1382                                 iov_iter_zero(zlen, &i);
1383                                 ret += zlen;
1384                         }
1385                         if (ret >= 0)
1386                                 len = ret;
1387                 }
1388
1389                 put_bvecs(bvecs, num_pages, should_dirty);
1390                 ceph_osdc_put_request(req);
1391                 if (ret < 0)
1392                         break;
1393
1394                 pos += len;
1395                 if (!write && pos >= size)
1396                         break;
1397
1398                 if (write && pos > size) {
1399                         if (ceph_inode_set_size(inode, pos))
1400                                 ceph_check_caps(ceph_inode(inode),
1401                                                 CHECK_CAPS_AUTHONLY,
1402                                                 NULL);
1403                 }
1404         }
1405
1406         if (aio_req) {
1407                 LIST_HEAD(osd_reqs);
1408
1409                 if (aio_req->num_reqs == 0) {
1410                         kfree(aio_req);
1411                         return ret;
1412                 }
1413
1414                 ceph_get_cap_refs(ci, write ? CEPH_CAP_FILE_WR :
1415                                               CEPH_CAP_FILE_RD);
1416
1417                 list_splice(&aio_req->osd_reqs, &osd_reqs);
1418                 inode_dio_begin(inode);
1419                 while (!list_empty(&osd_reqs)) {
1420                         req = list_first_entry(&osd_reqs,
1421                                                struct ceph_osd_request,
1422                                                r_private_item);
1423                         list_del_init(&req->r_private_item);
1424                         if (ret >= 0)
1425                                 ret = ceph_osdc_start_request(req->r_osdc,
1426                                                               req, false);
1427                         if (ret < 0) {
1428                                 req->r_result = ret;
1429                                 ceph_aio_complete_req(req);
1430                         }
1431                 }
1432                 return -EIOCBQUEUED;
1433         }
1434
1435         if (ret != -EOLDSNAPC && pos > iocb->ki_pos) {
1436                 ret = pos - iocb->ki_pos;
1437                 iocb->ki_pos = pos;
1438         }
1439         return ret;
1440 }
1441
1442 /*
1443  * Synchronous write, straight from __user pointer or user pages.
1444  *
1445  * If write spans object boundary, just do multiple writes.  (For a
1446  * correct atomic write, we should e.g. take write locks on all
1447  * objects, rollback on failure, etc.)
1448  */
1449 static ssize_t
1450 ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos,
1451                 struct ceph_snap_context *snapc)
1452 {
1453         struct file *file = iocb->ki_filp;
1454         struct inode *inode = file_inode(file);
1455         struct ceph_inode_info *ci = ceph_inode(inode);
1456         struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1457         struct ceph_vino vino;
1458         struct ceph_osd_request *req;
1459         struct page **pages;
1460         u64 len;
1461         int num_pages;
1462         int written = 0;
1463         int flags;
1464         int ret;
1465         bool check_caps = false;
1466         struct timespec64 mtime = current_time(inode);
1467         size_t count = iov_iter_count(from);
1468
1469         if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
1470                 return -EROFS;
1471
1472         dout("sync_write on file %p %lld~%u snapc %p seq %lld\n",
1473              file, pos, (unsigned)count, snapc, snapc->seq);
1474
1475         ret = filemap_write_and_wait_range(inode->i_mapping,
1476                                            pos, pos + count - 1);
1477         if (ret < 0)
1478                 return ret;
1479
1480         ceph_fscache_invalidate(inode, false);
1481         ret = invalidate_inode_pages2_range(inode->i_mapping,
1482                                             pos >> PAGE_SHIFT,
1483                                             (pos + count - 1) >> PAGE_SHIFT);
1484         if (ret < 0)
1485                 dout("invalidate_inode_pages2_range returned %d\n", ret);
1486
1487         flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE;
1488
1489         while ((len = iov_iter_count(from)) > 0) {
1490                 size_t left;
1491                 int n;
1492
1493                 vino = ceph_vino(inode);
1494                 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1495                                             vino, pos, &len, 0, 1,
1496                                             CEPH_OSD_OP_WRITE, flags, snapc,
1497                                             ci->i_truncate_seq,
1498                                             ci->i_truncate_size,
1499                                             false);
1500                 if (IS_ERR(req)) {
1501                         ret = PTR_ERR(req);
1502                         break;
1503                 }
1504
1505                 /*
1506                  * write from beginning of first page,
1507                  * regardless of io alignment
1508                  */
1509                 num_pages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
1510
1511                 pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
1512                 if (IS_ERR(pages)) {
1513                         ret = PTR_ERR(pages);
1514                         goto out;
1515                 }
1516
1517                 left = len;
1518                 for (n = 0; n < num_pages; n++) {
1519                         size_t plen = min_t(size_t, left, PAGE_SIZE);
1520                         ret = copy_page_from_iter(pages[n], 0, plen, from);
1521                         if (ret != plen) {
1522                                 ret = -EFAULT;
1523                                 break;
1524                         }
1525                         left -= ret;
1526                 }
1527
1528                 if (ret < 0) {
1529                         ceph_release_page_vector(pages, num_pages);
1530                         goto out;
1531                 }
1532
1533                 req->r_inode = inode;
1534
1535                 osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0,
1536                                                 false, true);
1537
1538                 req->r_mtime = mtime;
1539                 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
1540                 if (!ret)
1541                         ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1542
1543                 ceph_update_write_metrics(&fsc->mdsc->metric, req->r_start_latency,
1544                                           req->r_end_latency, len, ret);
1545 out:
1546                 ceph_osdc_put_request(req);
1547                 if (ret != 0) {
1548                         ceph_set_error_write(ci);
1549                         break;
1550                 }
1551
1552                 ceph_clear_error_write(ci);
1553                 pos += len;
1554                 written += len;
1555                 if (pos > i_size_read(inode)) {
1556                         check_caps = ceph_inode_set_size(inode, pos);
1557                         if (check_caps)
1558                                 ceph_check_caps(ceph_inode(inode),
1559                                                 CHECK_CAPS_AUTHONLY,
1560                                                 NULL);
1561                 }
1562
1563         }
1564
1565         if (ret != -EOLDSNAPC && written > 0) {
1566                 ret = written;
1567                 iocb->ki_pos = pos;
1568         }
1569         return ret;
1570 }
1571
1572 /*
1573  * Wrap generic_file_aio_read with checks for cap bits on the inode.
1574  * Atomically grab references, so that those bits are not released
1575  * back to the MDS mid-read.
1576  *
1577  * Hmm, the sync read case isn't actually async... should it be?
1578  */
1579 static ssize_t ceph_read_iter(struct kiocb *iocb, struct iov_iter *to)
1580 {
1581         struct file *filp = iocb->ki_filp;
1582         struct ceph_file_info *fi = filp->private_data;
1583         size_t len = iov_iter_count(to);
1584         struct inode *inode = file_inode(filp);
1585         struct ceph_inode_info *ci = ceph_inode(inode);
1586         bool direct_lock = iocb->ki_flags & IOCB_DIRECT;
1587         ssize_t ret;
1588         int want = 0, got = 0;
1589         int retry_op = 0, read = 0;
1590
1591 again:
1592         dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n",
1593              inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, inode);
1594
1595         if (ceph_inode_is_shutdown(inode))
1596                 return -ESTALE;
1597
1598         if (direct_lock)
1599                 ceph_start_io_direct(inode);
1600         else
1601                 ceph_start_io_read(inode);
1602
1603         if (!(fi->flags & CEPH_F_SYNC) && !direct_lock)
1604                 want |= CEPH_CAP_FILE_CACHE;
1605         if (fi->fmode & CEPH_FILE_MODE_LAZY)
1606                 want |= CEPH_CAP_FILE_LAZYIO;
1607
1608         ret = ceph_get_caps(filp, CEPH_CAP_FILE_RD, want, -1, &got);
1609         if (ret < 0) {
1610                 if (direct_lock)
1611                         ceph_end_io_direct(inode);
1612                 else
1613                         ceph_end_io_read(inode);
1614                 return ret;
1615         }
1616
1617         if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 ||
1618             (iocb->ki_flags & IOCB_DIRECT) ||
1619             (fi->flags & CEPH_F_SYNC)) {
1620
1621                 dout("aio_sync_read %p %llx.%llx %llu~%u got cap refs on %s\n",
1622                      inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
1623                      ceph_cap_string(got));
1624
1625                 if (ci->i_inline_version == CEPH_INLINE_NONE) {
1626                         if (!retry_op && (iocb->ki_flags & IOCB_DIRECT)) {
1627                                 ret = ceph_direct_read_write(iocb, to,
1628                                                              NULL, NULL);
1629                                 if (ret >= 0 && ret < len)
1630                                         retry_op = CHECK_EOF;
1631                         } else {
1632                                 ret = ceph_sync_read(iocb, to, &retry_op);
1633                         }
1634                 } else {
1635                         retry_op = READ_INLINE;
1636                 }
1637         } else {
1638                 CEPH_DEFINE_RW_CONTEXT(rw_ctx, got);
1639                 dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n",
1640                      inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
1641                      ceph_cap_string(got));
1642                 ceph_add_rw_context(fi, &rw_ctx);
1643                 ret = generic_file_read_iter(iocb, to);
1644                 ceph_del_rw_context(fi, &rw_ctx);
1645         }
1646
1647         dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n",
1648              inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret);
1649         ceph_put_cap_refs(ci, got);
1650
1651         if (direct_lock)
1652                 ceph_end_io_direct(inode);
1653         else
1654                 ceph_end_io_read(inode);
1655
1656         if (retry_op > HAVE_RETRIED && ret >= 0) {
1657                 int statret;
1658                 struct page *page = NULL;
1659                 loff_t i_size;
1660                 if (retry_op == READ_INLINE) {
1661                         page = __page_cache_alloc(GFP_KERNEL);
1662                         if (!page)
1663                                 return -ENOMEM;
1664                 }
1665
1666                 statret = __ceph_do_getattr(inode, page,
1667                                             CEPH_STAT_CAP_INLINE_DATA, !!page);
1668                 if (statret < 0) {
1669                         if (page)
1670                                 __free_page(page);
1671                         if (statret == -ENODATA) {
1672                                 BUG_ON(retry_op != READ_INLINE);
1673                                 goto again;
1674                         }
1675                         return statret;
1676                 }
1677
1678                 i_size = i_size_read(inode);
1679                 if (retry_op == READ_INLINE) {
1680                         BUG_ON(ret > 0 || read > 0);
1681                         if (iocb->ki_pos < i_size &&
1682                             iocb->ki_pos < PAGE_SIZE) {
1683                                 loff_t end = min_t(loff_t, i_size,
1684                                                    iocb->ki_pos + len);
1685                                 end = min_t(loff_t, end, PAGE_SIZE);
1686                                 if (statret < end)
1687                                         zero_user_segment(page, statret, end);
1688                                 ret = copy_page_to_iter(page,
1689                                                 iocb->ki_pos & ~PAGE_MASK,
1690                                                 end - iocb->ki_pos, to);
1691                                 iocb->ki_pos += ret;
1692                                 read += ret;
1693                         }
1694                         if (iocb->ki_pos < i_size && read < len) {
1695                                 size_t zlen = min_t(size_t, len - read,
1696                                                     i_size - iocb->ki_pos);
1697                                 ret = iov_iter_zero(zlen, to);
1698                                 iocb->ki_pos += ret;
1699                                 read += ret;
1700                         }
1701                         __free_pages(page, 0);
1702                         return read;
1703                 }
1704
1705                 /* hit EOF or hole? */
1706                 if (retry_op == CHECK_EOF && iocb->ki_pos < i_size &&
1707                     ret < len) {
1708                         dout("sync_read hit hole, ppos %lld < size %lld"
1709                              ", reading more\n", iocb->ki_pos, i_size);
1710
1711                         read += ret;
1712                         len -= ret;
1713                         retry_op = HAVE_RETRIED;
1714                         goto again;
1715                 }
1716         }
1717
1718         if (ret >= 0)
1719                 ret += read;
1720
1721         return ret;
1722 }
1723
1724 /*
1725  * Take cap references to avoid releasing caps to MDS mid-write.
1726  *
1727  * If we are synchronous, and write with an old snap context, the OSD
1728  * may return EOLDSNAPC.  In that case, retry the write.. _after_
1729  * dropping our cap refs and allowing the pending snap to logically
1730  * complete _before_ this write occurs.
1731  *
1732  * If we are near ENOSPC, write synchronously.
1733  */
1734 static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from)
1735 {
1736         struct file *file = iocb->ki_filp;
1737         struct ceph_file_info *fi = file->private_data;
1738         struct inode *inode = file_inode(file);
1739         struct ceph_inode_info *ci = ceph_inode(inode);
1740         struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1741         struct ceph_osd_client *osdc = &fsc->client->osdc;
1742         struct ceph_cap_flush *prealloc_cf;
1743         ssize_t count, written = 0;
1744         int err, want = 0, got;
1745         bool direct_lock = false;
1746         u32 map_flags;
1747         u64 pool_flags;
1748         loff_t pos;
1749         loff_t limit = max(i_size_read(inode), fsc->max_file_size);
1750
1751         if (ceph_inode_is_shutdown(inode))
1752                 return -ESTALE;
1753
1754         if (ceph_snap(inode) != CEPH_NOSNAP)
1755                 return -EROFS;
1756
1757         prealloc_cf = ceph_alloc_cap_flush();
1758         if (!prealloc_cf)
1759                 return -ENOMEM;
1760
1761         if ((iocb->ki_flags & (IOCB_DIRECT | IOCB_APPEND)) == IOCB_DIRECT)
1762                 direct_lock = true;
1763
1764 retry_snap:
1765         if (direct_lock)
1766                 ceph_start_io_direct(inode);
1767         else
1768                 ceph_start_io_write(inode);
1769
1770         /* We can write back this queue in page reclaim */
1771         current->backing_dev_info = inode_to_bdi(inode);
1772
1773         if (iocb->ki_flags & IOCB_APPEND) {
1774                 err = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
1775                 if (err < 0)
1776                         goto out;
1777         }
1778
1779         err = generic_write_checks(iocb, from);
1780         if (err <= 0)
1781                 goto out;
1782
1783         pos = iocb->ki_pos;
1784         if (unlikely(pos >= limit)) {
1785                 err = -EFBIG;
1786                 goto out;
1787         } else {
1788                 iov_iter_truncate(from, limit - pos);
1789         }
1790
1791         count = iov_iter_count(from);
1792         if (ceph_quota_is_max_bytes_exceeded(inode, pos + count)) {
1793                 err = -EDQUOT;
1794                 goto out;
1795         }
1796
1797         down_read(&osdc->lock);
1798         map_flags = osdc->osdmap->flags;
1799         pool_flags = ceph_pg_pool_flags(osdc->osdmap, ci->i_layout.pool_id);
1800         up_read(&osdc->lock);
1801         if ((map_flags & CEPH_OSDMAP_FULL) ||
1802             (pool_flags & CEPH_POOL_FLAG_FULL)) {
1803                 err = -ENOSPC;
1804                 goto out;
1805         }
1806
1807         err = file_remove_privs(file);
1808         if (err)
1809                 goto out;
1810
1811         dout("aio_write %p %llx.%llx %llu~%zd getting caps. i_size %llu\n",
1812              inode, ceph_vinop(inode), pos, count, i_size_read(inode));
1813         if (!(fi->flags & CEPH_F_SYNC) && !direct_lock)
1814                 want |= CEPH_CAP_FILE_BUFFER;
1815         if (fi->fmode & CEPH_FILE_MODE_LAZY)
1816                 want |= CEPH_CAP_FILE_LAZYIO;
1817         got = 0;
1818         err = ceph_get_caps(file, CEPH_CAP_FILE_WR, want, pos + count, &got);
1819         if (err < 0)
1820                 goto out;
1821
1822         err = file_update_time(file);
1823         if (err)
1824                 goto out_caps;
1825
1826         inode_inc_iversion_raw(inode);
1827
1828         dout("aio_write %p %llx.%llx %llu~%zd got cap refs on %s\n",
1829              inode, ceph_vinop(inode), pos, count, ceph_cap_string(got));
1830
1831         if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 ||
1832             (iocb->ki_flags & IOCB_DIRECT) || (fi->flags & CEPH_F_SYNC) ||
1833             (ci->i_ceph_flags & CEPH_I_ERROR_WRITE)) {
1834                 struct ceph_snap_context *snapc;
1835                 struct iov_iter data;
1836
1837                 spin_lock(&ci->i_ceph_lock);
1838                 if (__ceph_have_pending_cap_snap(ci)) {
1839                         struct ceph_cap_snap *capsnap =
1840                                         list_last_entry(&ci->i_cap_snaps,
1841                                                         struct ceph_cap_snap,
1842                                                         ci_item);
1843                         snapc = ceph_get_snap_context(capsnap->context);
1844                 } else {
1845                         BUG_ON(!ci->i_head_snapc);
1846                         snapc = ceph_get_snap_context(ci->i_head_snapc);
1847                 }
1848                 spin_unlock(&ci->i_ceph_lock);
1849
1850                 /* we might need to revert back to that point */
1851                 data = *from;
1852                 if (iocb->ki_flags & IOCB_DIRECT)
1853                         written = ceph_direct_read_write(iocb, &data, snapc,
1854                                                          &prealloc_cf);
1855                 else
1856                         written = ceph_sync_write(iocb, &data, pos, snapc);
1857                 if (direct_lock)
1858                         ceph_end_io_direct(inode);
1859                 else
1860                         ceph_end_io_write(inode);
1861                 if (written > 0)
1862                         iov_iter_advance(from, written);
1863                 ceph_put_snap_context(snapc);
1864         } else {
1865                 /*
1866                  * No need to acquire the i_truncate_mutex. Because
1867                  * the MDS revokes Fwb caps before sending truncate
1868                  * message to us. We can't get Fwb cap while there
1869                  * are pending vmtruncate. So write and vmtruncate
1870                  * can not run at the same time
1871                  */
1872                 written = generic_perform_write(iocb, from);
1873                 if (likely(written >= 0))
1874                         iocb->ki_pos = pos + written;
1875                 ceph_end_io_write(inode);
1876         }
1877
1878         if (written >= 0) {
1879                 int dirty;
1880
1881                 spin_lock(&ci->i_ceph_lock);
1882                 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1883                                                &prealloc_cf);
1884                 spin_unlock(&ci->i_ceph_lock);
1885                 if (dirty)
1886                         __mark_inode_dirty(inode, dirty);
1887                 if (ceph_quota_is_max_bytes_approaching(inode, iocb->ki_pos))
1888                         ceph_check_caps(ci, 0, NULL);
1889         }
1890
1891         dout("aio_write %p %llx.%llx %llu~%u  dropping cap refs on %s\n",
1892              inode, ceph_vinop(inode), pos, (unsigned)count,
1893              ceph_cap_string(got));
1894         ceph_put_cap_refs(ci, got);
1895
1896         if (written == -EOLDSNAPC) {
1897                 dout("aio_write %p %llx.%llx %llu~%u" "got EOLDSNAPC, retrying\n",
1898                      inode, ceph_vinop(inode), pos, (unsigned)count);
1899                 goto retry_snap;
1900         }
1901
1902         if (written >= 0) {
1903                 if ((map_flags & CEPH_OSDMAP_NEARFULL) ||
1904                     (pool_flags & CEPH_POOL_FLAG_NEARFULL))
1905                         iocb->ki_flags |= IOCB_DSYNC;
1906                 written = generic_write_sync(iocb, written);
1907         }
1908
1909         goto out_unlocked;
1910 out_caps:
1911         ceph_put_cap_refs(ci, got);
1912 out:
1913         if (direct_lock)
1914                 ceph_end_io_direct(inode);
1915         else
1916                 ceph_end_io_write(inode);
1917 out_unlocked:
1918         ceph_free_cap_flush(prealloc_cf);
1919         current->backing_dev_info = NULL;
1920         return written ? written : err;
1921 }
1922
1923 /*
1924  * llseek.  be sure to verify file size on SEEK_END.
1925  */
1926 static loff_t ceph_llseek(struct file *file, loff_t offset, int whence)
1927 {
1928         struct inode *inode = file->f_mapping->host;
1929         struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1930         loff_t i_size;
1931         loff_t ret;
1932
1933         inode_lock(inode);
1934
1935         if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) {
1936                 ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
1937                 if (ret < 0)
1938                         goto out;
1939         }
1940
1941         i_size = i_size_read(inode);
1942         switch (whence) {
1943         case SEEK_END:
1944                 offset += i_size;
1945                 break;
1946         case SEEK_CUR:
1947                 /*
1948                  * Here we special-case the lseek(fd, 0, SEEK_CUR)
1949                  * position-querying operation.  Avoid rewriting the "same"
1950                  * f_pos value back to the file because a concurrent read(),
1951                  * write() or lseek() might have altered it
1952                  */
1953                 if (offset == 0) {
1954                         ret = file->f_pos;
1955                         goto out;
1956                 }
1957                 offset += file->f_pos;
1958                 break;
1959         case SEEK_DATA:
1960                 if (offset < 0 || offset >= i_size) {
1961                         ret = -ENXIO;
1962                         goto out;
1963                 }
1964                 break;
1965         case SEEK_HOLE:
1966                 if (offset < 0 || offset >= i_size) {
1967                         ret = -ENXIO;
1968                         goto out;
1969                 }
1970                 offset = i_size;
1971                 break;
1972         }
1973
1974         ret = vfs_setpos(file, offset, max(i_size, fsc->max_file_size));
1975
1976 out:
1977         inode_unlock(inode);
1978         return ret;
1979 }
1980
1981 static inline void ceph_zero_partial_page(
1982         struct inode *inode, loff_t offset, unsigned size)
1983 {
1984         struct page *page;
1985         pgoff_t index = offset >> PAGE_SHIFT;
1986
1987         page = find_lock_page(inode->i_mapping, index);
1988         if (page) {
1989                 wait_on_page_writeback(page);
1990                 zero_user(page, offset & (PAGE_SIZE - 1), size);
1991                 unlock_page(page);
1992                 put_page(page);
1993         }
1994 }
1995
1996 static void ceph_zero_pagecache_range(struct inode *inode, loff_t offset,
1997                                       loff_t length)
1998 {
1999         loff_t nearly = round_up(offset, PAGE_SIZE);
2000         if (offset < nearly) {
2001                 loff_t size = nearly - offset;
2002                 if (length < size)
2003                         size = length;
2004                 ceph_zero_partial_page(inode, offset, size);
2005                 offset += size;
2006                 length -= size;
2007         }
2008         if (length >= PAGE_SIZE) {
2009                 loff_t size = round_down(length, PAGE_SIZE);
2010                 truncate_pagecache_range(inode, offset, offset + size - 1);
2011                 offset += size;
2012                 length -= size;
2013         }
2014         if (length)
2015                 ceph_zero_partial_page(inode, offset, length);
2016 }
2017
2018 static int ceph_zero_partial_object(struct inode *inode,
2019                                     loff_t offset, loff_t *length)
2020 {
2021         struct ceph_inode_info *ci = ceph_inode(inode);
2022         struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
2023         struct ceph_osd_request *req;
2024         int ret = 0;
2025         loff_t zero = 0;
2026         int op;
2027
2028         if (!length) {
2029                 op = offset ? CEPH_OSD_OP_DELETE : CEPH_OSD_OP_TRUNCATE;
2030                 length = &zero;
2031         } else {
2032                 op = CEPH_OSD_OP_ZERO;
2033         }
2034
2035         req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
2036                                         ceph_vino(inode),
2037                                         offset, length,
2038                                         0, 1, op,
2039                                         CEPH_OSD_FLAG_WRITE,
2040                                         NULL, 0, 0, false);
2041         if (IS_ERR(req)) {
2042                 ret = PTR_ERR(req);
2043                 goto out;
2044         }
2045
2046         req->r_mtime = inode->i_mtime;
2047         ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
2048         if (!ret) {
2049                 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
2050                 if (ret == -ENOENT)
2051                         ret = 0;
2052         }
2053         ceph_osdc_put_request(req);
2054
2055 out:
2056         return ret;
2057 }
2058
2059 static int ceph_zero_objects(struct inode *inode, loff_t offset, loff_t length)
2060 {
2061         int ret = 0;
2062         struct ceph_inode_info *ci = ceph_inode(inode);
2063         s32 stripe_unit = ci->i_layout.stripe_unit;
2064         s32 stripe_count = ci->i_layout.stripe_count;
2065         s32 object_size = ci->i_layout.object_size;
2066         u64 object_set_size = object_size * stripe_count;
2067         u64 nearly, t;
2068
2069         /* round offset up to next period boundary */
2070         nearly = offset + object_set_size - 1;
2071         t = nearly;
2072         nearly -= do_div(t, object_set_size);
2073
2074         while (length && offset < nearly) {
2075                 loff_t size = length;
2076                 ret = ceph_zero_partial_object(inode, offset, &size);
2077                 if (ret < 0)
2078                         return ret;
2079                 offset += size;
2080                 length -= size;
2081         }
2082         while (length >= object_set_size) {
2083                 int i;
2084                 loff_t pos = offset;
2085                 for (i = 0; i < stripe_count; ++i) {
2086                         ret = ceph_zero_partial_object(inode, pos, NULL);
2087                         if (ret < 0)
2088                                 return ret;
2089                         pos += stripe_unit;
2090                 }
2091                 offset += object_set_size;
2092                 length -= object_set_size;
2093         }
2094         while (length) {
2095                 loff_t size = length;
2096                 ret = ceph_zero_partial_object(inode, offset, &size);
2097                 if (ret < 0)
2098                         return ret;
2099                 offset += size;
2100                 length -= size;
2101         }
2102         return ret;
2103 }
2104
2105 static long ceph_fallocate(struct file *file, int mode,
2106                                 loff_t offset, loff_t length)
2107 {
2108         struct ceph_file_info *fi = file->private_data;
2109         struct inode *inode = file_inode(file);
2110         struct ceph_inode_info *ci = ceph_inode(inode);
2111         struct ceph_cap_flush *prealloc_cf;
2112         int want, got = 0;
2113         int dirty;
2114         int ret = 0;
2115         loff_t endoff = 0;
2116         loff_t size;
2117
2118         if (mode != (FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
2119                 return -EOPNOTSUPP;
2120
2121         if (!S_ISREG(inode->i_mode))
2122                 return -EOPNOTSUPP;
2123
2124         prealloc_cf = ceph_alloc_cap_flush();
2125         if (!prealloc_cf)
2126                 return -ENOMEM;
2127
2128         inode_lock(inode);
2129
2130         if (ceph_snap(inode) != CEPH_NOSNAP) {
2131                 ret = -EROFS;
2132                 goto unlock;
2133         }
2134
2135         size = i_size_read(inode);
2136
2137         /* Are we punching a hole beyond EOF? */
2138         if (offset >= size)
2139                 goto unlock;
2140         if ((offset + length) > size)
2141                 length = size - offset;
2142
2143         if (fi->fmode & CEPH_FILE_MODE_LAZY)
2144                 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
2145         else
2146                 want = CEPH_CAP_FILE_BUFFER;
2147
2148         ret = ceph_get_caps(file, CEPH_CAP_FILE_WR, want, endoff, &got);
2149         if (ret < 0)
2150                 goto unlock;
2151
2152         filemap_invalidate_lock(inode->i_mapping);
2153         ceph_fscache_invalidate(inode, false);
2154         ceph_zero_pagecache_range(inode, offset, length);
2155         ret = ceph_zero_objects(inode, offset, length);
2156
2157         if (!ret) {
2158                 spin_lock(&ci->i_ceph_lock);
2159                 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
2160                                                &prealloc_cf);
2161                 spin_unlock(&ci->i_ceph_lock);
2162                 if (dirty)
2163                         __mark_inode_dirty(inode, dirty);
2164         }
2165         filemap_invalidate_unlock(inode->i_mapping);
2166
2167         ceph_put_cap_refs(ci, got);
2168 unlock:
2169         inode_unlock(inode);
2170         ceph_free_cap_flush(prealloc_cf);
2171         return ret;
2172 }
2173
2174 /*
2175  * This function tries to get FILE_WR capabilities for dst_ci and FILE_RD for
2176  * src_ci.  Two attempts are made to obtain both caps, and an error is return if
2177  * this fails; zero is returned on success.
2178  */
2179 static int get_rd_wr_caps(struct file *src_filp, int *src_got,
2180                           struct file *dst_filp,
2181                           loff_t dst_endoff, int *dst_got)
2182 {
2183         int ret = 0;
2184         bool retrying = false;
2185
2186 retry_caps:
2187         ret = ceph_get_caps(dst_filp, CEPH_CAP_FILE_WR, CEPH_CAP_FILE_BUFFER,
2188                             dst_endoff, dst_got);
2189         if (ret < 0)
2190                 return ret;
2191
2192         /*
2193          * Since we're already holding the FILE_WR capability for the dst file,
2194          * we would risk a deadlock by using ceph_get_caps.  Thus, we'll do some
2195          * retry dance instead to try to get both capabilities.
2196          */
2197         ret = ceph_try_get_caps(file_inode(src_filp),
2198                                 CEPH_CAP_FILE_RD, CEPH_CAP_FILE_SHARED,
2199                                 false, src_got);
2200         if (ret <= 0) {
2201                 /* Start by dropping dst_ci caps and getting src_ci caps */
2202                 ceph_put_cap_refs(ceph_inode(file_inode(dst_filp)), *dst_got);
2203                 if (retrying) {
2204                         if (!ret)
2205                                 /* ceph_try_get_caps masks EAGAIN */
2206                                 ret = -EAGAIN;
2207                         return ret;
2208                 }
2209                 ret = ceph_get_caps(src_filp, CEPH_CAP_FILE_RD,
2210                                     CEPH_CAP_FILE_SHARED, -1, src_got);
2211                 if (ret < 0)
2212                         return ret;
2213                 /*... drop src_ci caps too, and retry */
2214                 ceph_put_cap_refs(ceph_inode(file_inode(src_filp)), *src_got);
2215                 retrying = true;
2216                 goto retry_caps;
2217         }
2218         return ret;
2219 }
2220
2221 static void put_rd_wr_caps(struct ceph_inode_info *src_ci, int src_got,
2222                            struct ceph_inode_info *dst_ci, int dst_got)
2223 {
2224         ceph_put_cap_refs(src_ci, src_got);
2225         ceph_put_cap_refs(dst_ci, dst_got);
2226 }
2227
2228 /*
2229  * This function does several size-related checks, returning an error if:
2230  *  - source file is smaller than off+len
2231  *  - destination file size is not OK (inode_newsize_ok())
2232  *  - max bytes quotas is exceeded
2233  */
2234 static int is_file_size_ok(struct inode *src_inode, struct inode *dst_inode,
2235                            loff_t src_off, loff_t dst_off, size_t len)
2236 {
2237         loff_t size, endoff;
2238
2239         size = i_size_read(src_inode);
2240         /*
2241          * Don't copy beyond source file EOF.  Instead of simply setting length
2242          * to (size - src_off), just drop to VFS default implementation, as the
2243          * local i_size may be stale due to other clients writing to the source
2244          * inode.
2245          */
2246         if (src_off + len > size) {
2247                 dout("Copy beyond EOF (%llu + %zu > %llu)\n",
2248                      src_off, len, size);
2249                 return -EOPNOTSUPP;
2250         }
2251         size = i_size_read(dst_inode);
2252
2253         endoff = dst_off + len;
2254         if (inode_newsize_ok(dst_inode, endoff))
2255                 return -EOPNOTSUPP;
2256
2257         if (ceph_quota_is_max_bytes_exceeded(dst_inode, endoff))
2258                 return -EDQUOT;
2259
2260         return 0;
2261 }
2262
2263 static struct ceph_osd_request *
2264 ceph_alloc_copyfrom_request(struct ceph_osd_client *osdc,
2265                             u64 src_snapid,
2266                             struct ceph_object_id *src_oid,
2267                             struct ceph_object_locator *src_oloc,
2268                             struct ceph_object_id *dst_oid,
2269                             struct ceph_object_locator *dst_oloc,
2270                             u32 truncate_seq, u64 truncate_size)
2271 {
2272         struct ceph_osd_request *req;
2273         int ret;
2274         u32 src_fadvise_flags =
2275                 CEPH_OSD_OP_FLAG_FADVISE_SEQUENTIAL |
2276                 CEPH_OSD_OP_FLAG_FADVISE_NOCACHE;
2277         u32 dst_fadvise_flags =
2278                 CEPH_OSD_OP_FLAG_FADVISE_SEQUENTIAL |
2279                 CEPH_OSD_OP_FLAG_FADVISE_DONTNEED;
2280
2281         req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_KERNEL);
2282         if (!req)
2283                 return ERR_PTR(-ENOMEM);
2284
2285         req->r_flags = CEPH_OSD_FLAG_WRITE;
2286
2287         ceph_oloc_copy(&req->r_t.base_oloc, dst_oloc);
2288         ceph_oid_copy(&req->r_t.base_oid, dst_oid);
2289
2290         ret = osd_req_op_copy_from_init(req, src_snapid, 0,
2291                                         src_oid, src_oloc,
2292                                         src_fadvise_flags,
2293                                         dst_fadvise_flags,
2294                                         truncate_seq,
2295                                         truncate_size,
2296                                         CEPH_OSD_COPY_FROM_FLAG_TRUNCATE_SEQ);
2297         if (ret)
2298                 goto out;
2299
2300         ret = ceph_osdc_alloc_messages(req, GFP_KERNEL);
2301         if (ret)
2302                 goto out;
2303
2304         return req;
2305
2306 out:
2307         ceph_osdc_put_request(req);
2308         return ERR_PTR(ret);
2309 }
2310
2311 static ssize_t ceph_do_objects_copy(struct ceph_inode_info *src_ci, u64 *src_off,
2312                                     struct ceph_inode_info *dst_ci, u64 *dst_off,
2313                                     struct ceph_fs_client *fsc,
2314                                     size_t len, unsigned int flags)
2315 {
2316         struct ceph_object_locator src_oloc, dst_oloc;
2317         struct ceph_object_id src_oid, dst_oid;
2318         struct ceph_osd_client *osdc;
2319         struct ceph_osd_request *req;
2320         size_t bytes = 0;
2321         u64 src_objnum, src_objoff, dst_objnum, dst_objoff;
2322         u32 src_objlen, dst_objlen;
2323         u32 object_size = src_ci->i_layout.object_size;
2324         int ret;
2325
2326         src_oloc.pool = src_ci->i_layout.pool_id;
2327         src_oloc.pool_ns = ceph_try_get_string(src_ci->i_layout.pool_ns);
2328         dst_oloc.pool = dst_ci->i_layout.pool_id;
2329         dst_oloc.pool_ns = ceph_try_get_string(dst_ci->i_layout.pool_ns);
2330         osdc = &fsc->client->osdc;
2331
2332         while (len >= object_size) {
2333                 ceph_calc_file_object_mapping(&src_ci->i_layout, *src_off,
2334                                               object_size, &src_objnum,
2335                                               &src_objoff, &src_objlen);
2336                 ceph_calc_file_object_mapping(&dst_ci->i_layout, *dst_off,
2337                                               object_size, &dst_objnum,
2338                                               &dst_objoff, &dst_objlen);
2339                 ceph_oid_init(&src_oid);
2340                 ceph_oid_printf(&src_oid, "%llx.%08llx",
2341                                 src_ci->i_vino.ino, src_objnum);
2342                 ceph_oid_init(&dst_oid);
2343                 ceph_oid_printf(&dst_oid, "%llx.%08llx",
2344                                 dst_ci->i_vino.ino, dst_objnum);
2345                 /* Do an object remote copy */
2346                 req = ceph_alloc_copyfrom_request(osdc, src_ci->i_vino.snap,
2347                                                   &src_oid, &src_oloc,
2348                                                   &dst_oid, &dst_oloc,
2349                                                   dst_ci->i_truncate_seq,
2350                                                   dst_ci->i_truncate_size);
2351                 if (IS_ERR(req))
2352                         ret = PTR_ERR(req);
2353                 else {
2354                         ceph_osdc_start_request(osdc, req, false);
2355                         ret = ceph_osdc_wait_request(osdc, req);
2356                         ceph_update_copyfrom_metrics(&fsc->mdsc->metric,
2357                                                      req->r_start_latency,
2358                                                      req->r_end_latency,
2359                                                      object_size, ret);
2360                         ceph_osdc_put_request(req);
2361                 }
2362                 if (ret) {
2363                         if (ret == -EOPNOTSUPP) {
2364                                 fsc->have_copy_from2 = false;
2365                                 pr_notice("OSDs don't support copy-from2; disabling copy offload\n");
2366                         }
2367                         dout("ceph_osdc_copy_from returned %d\n", ret);
2368                         if (!bytes)
2369                                 bytes = ret;
2370                         goto out;
2371                 }
2372                 len -= object_size;
2373                 bytes += object_size;
2374                 *src_off += object_size;
2375                 *dst_off += object_size;
2376         }
2377
2378 out:
2379         ceph_oloc_destroy(&src_oloc);
2380         ceph_oloc_destroy(&dst_oloc);
2381         return bytes;
2382 }
2383
2384 static ssize_t __ceph_copy_file_range(struct file *src_file, loff_t src_off,
2385                                       struct file *dst_file, loff_t dst_off,
2386                                       size_t len, unsigned int flags)
2387 {
2388         struct inode *src_inode = file_inode(src_file);
2389         struct inode *dst_inode = file_inode(dst_file);
2390         struct ceph_inode_info *src_ci = ceph_inode(src_inode);
2391         struct ceph_inode_info *dst_ci = ceph_inode(dst_inode);
2392         struct ceph_cap_flush *prealloc_cf;
2393         struct ceph_fs_client *src_fsc = ceph_inode_to_client(src_inode);
2394         loff_t size;
2395         ssize_t ret = -EIO, bytes;
2396         u64 src_objnum, dst_objnum, src_objoff, dst_objoff;
2397         u32 src_objlen, dst_objlen;
2398         int src_got = 0, dst_got = 0, err, dirty;
2399
2400         if (src_inode->i_sb != dst_inode->i_sb) {
2401                 struct ceph_fs_client *dst_fsc = ceph_inode_to_client(dst_inode);
2402
2403                 if (ceph_fsid_compare(&src_fsc->client->fsid,
2404                                       &dst_fsc->client->fsid)) {
2405                         dout("Copying files across clusters: src: %pU dst: %pU\n",
2406                              &src_fsc->client->fsid, &dst_fsc->client->fsid);
2407                         return -EXDEV;
2408                 }
2409         }
2410         if (ceph_snap(dst_inode) != CEPH_NOSNAP)
2411                 return -EROFS;
2412
2413         /*
2414          * Some of the checks below will return -EOPNOTSUPP, which will force a
2415          * fallback to the default VFS copy_file_range implementation.  This is
2416          * desirable in several cases (for ex, the 'len' is smaller than the
2417          * size of the objects, or in cases where that would be more
2418          * efficient).
2419          */
2420
2421         if (ceph_test_mount_opt(src_fsc, NOCOPYFROM))
2422                 return -EOPNOTSUPP;
2423
2424         if (!src_fsc->have_copy_from2)
2425                 return -EOPNOTSUPP;
2426
2427         /*
2428          * Striped file layouts require that we copy partial objects, but the
2429          * OSD copy-from operation only supports full-object copies.  Limit
2430          * this to non-striped file layouts for now.
2431          */
2432         if ((src_ci->i_layout.stripe_unit != dst_ci->i_layout.stripe_unit) ||
2433             (src_ci->i_layout.stripe_count != 1) ||
2434             (dst_ci->i_layout.stripe_count != 1) ||
2435             (src_ci->i_layout.object_size != dst_ci->i_layout.object_size)) {
2436                 dout("Invalid src/dst files layout\n");
2437                 return -EOPNOTSUPP;
2438         }
2439
2440         if (len < src_ci->i_layout.object_size)
2441                 return -EOPNOTSUPP; /* no remote copy will be done */
2442
2443         prealloc_cf = ceph_alloc_cap_flush();
2444         if (!prealloc_cf)
2445                 return -ENOMEM;
2446
2447         /* Start by sync'ing the source and destination files */
2448         ret = file_write_and_wait_range(src_file, src_off, (src_off + len));
2449         if (ret < 0) {
2450                 dout("failed to write src file (%zd)\n", ret);
2451                 goto out;
2452         }
2453         ret = file_write_and_wait_range(dst_file, dst_off, (dst_off + len));
2454         if (ret < 0) {
2455                 dout("failed to write dst file (%zd)\n", ret);
2456                 goto out;
2457         }
2458
2459         /*
2460          * We need FILE_WR caps for dst_ci and FILE_RD for src_ci as other
2461          * clients may have dirty data in their caches.  And OSDs know nothing
2462          * about caps, so they can't safely do the remote object copies.
2463          */
2464         err = get_rd_wr_caps(src_file, &src_got,
2465                              dst_file, (dst_off + len), &dst_got);
2466         if (err < 0) {
2467                 dout("get_rd_wr_caps returned %d\n", err);
2468                 ret = -EOPNOTSUPP;
2469                 goto out;
2470         }
2471
2472         ret = is_file_size_ok(src_inode, dst_inode, src_off, dst_off, len);
2473         if (ret < 0)
2474                 goto out_caps;
2475
2476         /* Drop dst file cached pages */
2477         ceph_fscache_invalidate(dst_inode, false);
2478         ret = invalidate_inode_pages2_range(dst_inode->i_mapping,
2479                                             dst_off >> PAGE_SHIFT,
2480                                             (dst_off + len) >> PAGE_SHIFT);
2481         if (ret < 0) {
2482                 dout("Failed to invalidate inode pages (%zd)\n", ret);
2483                 ret = 0; /* XXX */
2484         }
2485         ceph_calc_file_object_mapping(&src_ci->i_layout, src_off,
2486                                       src_ci->i_layout.object_size,
2487                                       &src_objnum, &src_objoff, &src_objlen);
2488         ceph_calc_file_object_mapping(&dst_ci->i_layout, dst_off,
2489                                       dst_ci->i_layout.object_size,
2490                                       &dst_objnum, &dst_objoff, &dst_objlen);
2491         /* object-level offsets need to the same */
2492         if (src_objoff != dst_objoff) {
2493                 ret = -EOPNOTSUPP;
2494                 goto out_caps;
2495         }
2496
2497         /*
2498          * Do a manual copy if the object offset isn't object aligned.
2499          * 'src_objlen' contains the bytes left until the end of the object,
2500          * starting at the src_off
2501          */
2502         if (src_objoff) {
2503                 dout("Initial partial copy of %u bytes\n", src_objlen);
2504
2505                 /*
2506                  * we need to temporarily drop all caps as we'll be calling
2507                  * {read,write}_iter, which will get caps again.
2508                  */
2509                 put_rd_wr_caps(src_ci, src_got, dst_ci, dst_got);
2510                 ret = do_splice_direct(src_file, &src_off, dst_file,
2511                                        &dst_off, src_objlen, flags);
2512                 /* Abort on short copies or on error */
2513                 if (ret < src_objlen) {
2514                         dout("Failed partial copy (%zd)\n", ret);
2515                         goto out;
2516                 }
2517                 len -= ret;
2518                 err = get_rd_wr_caps(src_file, &src_got,
2519                                      dst_file, (dst_off + len), &dst_got);
2520                 if (err < 0)
2521                         goto out;
2522                 err = is_file_size_ok(src_inode, dst_inode,
2523                                       src_off, dst_off, len);
2524                 if (err < 0)
2525                         goto out_caps;
2526         }
2527
2528         size = i_size_read(dst_inode);
2529         bytes = ceph_do_objects_copy(src_ci, &src_off, dst_ci, &dst_off,
2530                                      src_fsc, len, flags);
2531         if (bytes <= 0) {
2532                 if (!ret)
2533                         ret = bytes;
2534                 goto out_caps;
2535         }
2536         dout("Copied %zu bytes out of %zu\n", bytes, len);
2537         len -= bytes;
2538         ret += bytes;
2539
2540         file_update_time(dst_file);
2541         inode_inc_iversion_raw(dst_inode);
2542
2543         if (dst_off > size) {
2544                 /* Let the MDS know about dst file size change */
2545                 if (ceph_inode_set_size(dst_inode, dst_off) ||
2546                     ceph_quota_is_max_bytes_approaching(dst_inode, dst_off))
2547                         ceph_check_caps(dst_ci, CHECK_CAPS_AUTHONLY, NULL);
2548         }
2549         /* Mark Fw dirty */
2550         spin_lock(&dst_ci->i_ceph_lock);
2551         dirty = __ceph_mark_dirty_caps(dst_ci, CEPH_CAP_FILE_WR, &prealloc_cf);
2552         spin_unlock(&dst_ci->i_ceph_lock);
2553         if (dirty)
2554                 __mark_inode_dirty(dst_inode, dirty);
2555
2556 out_caps:
2557         put_rd_wr_caps(src_ci, src_got, dst_ci, dst_got);
2558
2559         /*
2560          * Do the final manual copy if we still have some bytes left, unless
2561          * there were errors in remote object copies (len >= object_size).
2562          */
2563         if (len && (len < src_ci->i_layout.object_size)) {
2564                 dout("Final partial copy of %zu bytes\n", len);
2565                 bytes = do_splice_direct(src_file, &src_off, dst_file,
2566                                          &dst_off, len, flags);
2567                 if (bytes > 0)
2568                         ret += bytes;
2569                 else
2570                         dout("Failed partial copy (%zd)\n", bytes);
2571         }
2572
2573 out:
2574         ceph_free_cap_flush(prealloc_cf);
2575
2576         return ret;
2577 }
2578
2579 static ssize_t ceph_copy_file_range(struct file *src_file, loff_t src_off,
2580                                     struct file *dst_file, loff_t dst_off,
2581                                     size_t len, unsigned int flags)
2582 {
2583         ssize_t ret;
2584
2585         ret = __ceph_copy_file_range(src_file, src_off, dst_file, dst_off,
2586                                      len, flags);
2587
2588         if (ret == -EOPNOTSUPP || ret == -EXDEV)
2589                 ret = generic_copy_file_range(src_file, src_off, dst_file,
2590                                               dst_off, len, flags);
2591         return ret;
2592 }
2593
2594 const struct file_operations ceph_file_fops = {
2595         .open = ceph_open,
2596         .release = ceph_release,
2597         .llseek = ceph_llseek,
2598         .read_iter = ceph_read_iter,
2599         .write_iter = ceph_write_iter,
2600         .mmap = ceph_mmap,
2601         .fsync = ceph_fsync,
2602         .lock = ceph_lock,
2603         .setlease = simple_nosetlease,
2604         .flock = ceph_flock,
2605         .splice_read = generic_file_splice_read,
2606         .splice_write = iter_file_splice_write,
2607         .unlocked_ioctl = ceph_ioctl,
2608         .compat_ioctl = compat_ptr_ioctl,
2609         .fallocate      = ceph_fallocate,
2610         .copy_file_range = ceph_copy_file_range,
2611 };