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