fs/ceph/addr.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/ceph/ceph_debug.h>
   3
   4 #include <linux/backing-dev.h>
   5 #include <linux/fs.h>
   6 #include <linux/mm.h>
   7 #include <linux/swap.h>
   8 #include <linux/pagemap.h>
   9 #include <linux/slab.h>
  10 #include <linux/pagevec.h>
  11 #include <linux/task_io_accounting_ops.h>
  12 #include <linux/signal.h>
  13 #include <linux/iversion.h>
  14 #include <linux/ktime.h>
  15 #include <linux/netfs.h>
  16
  17 #include "super.h"
  18 #include "mds_client.h"
  19 #include "cache.h"
  20 #include "metric.h"
  21 #include "crypto.h"
  22 #include <linux/ceph/osd_client.h>
  23 #include <linux/ceph/striper.h>
  24
  25 /*
  26  * Ceph address space ops.
  27  *
  28  * There are a few funny things going on here.
  29  *
  30  * The page->private field is used to reference a struct
  31  * ceph_snap_context for _every_ dirty page.  This indicates which
  32  * snapshot the page was logically dirtied in, and thus which snap
  33  * context needs to be associated with the osd write during writeback.
  34  *
  35  * Similarly, struct ceph_inode_info maintains a set of counters to
  36  * count dirty pages on the inode.  In the absence of snapshots,
  37  * i_wrbuffer_ref == i_wrbuffer_ref_head == the dirty page count.
  38  *
  39  * When a snapshot is taken (that is, when the client receives
  40  * notification that a snapshot was taken), each inode with caps and
  41  * with dirty pages (dirty pages implies there is a cap) gets a new
  42  * ceph_cap_snap in the i_cap_snaps list (which is sorted in ascending
  43  * order, new snaps go to the tail).  The i_wrbuffer_ref_head count is
  44  * moved to capsnap->dirty. (Unless a sync write is currently in
  45  * progress.  In that case, the capsnap is said to be "pending", new
  46  * writes cannot start, and the capsnap isn't "finalized" until the
  47  * write completes (or fails) and a final size/mtime for the inode for
  48  * that snap can be settled upon.)  i_wrbuffer_ref_head is reset to 0.
  49  *
  50  * On writeback, we must submit writes to the osd IN SNAP ORDER.  So,
  51  * we look for the first capsnap in i_cap_snaps and write out pages in
  52  * that snap context _only_.  Then we move on to the next capsnap,
  53  * eventually reaching the "live" or "head" context (i.e., pages that
  54  * are not yet snapped) and are writing the most recently dirtied
  55  * pages.
  56  *
  57  * Invalidate and so forth must take care to ensure the dirty page
  58  * accounting is preserved.
  59  */
  60
  61 #define CONGESTION_ON_THRESH(congestion_kb) (congestion_kb >> (PAGE_SHIFT-10))
  62 #define CONGESTION_OFF_THRESH(congestion_kb)                            \
  63         (CONGESTION_ON_THRESH(congestion_kb) -                          \
  64          (CONGESTION_ON_THRESH(congestion_kb) >> 2))
  65
  66 static int ceph_netfs_check_write_begin(struct file *file, loff_t pos, unsigned int len,
  67                                         struct folio **foliop, void **_fsdata);
  68
  69 static inline struct ceph_snap_context *page_snap_context(struct page *page)
  70 {
  71         if (PagePrivate(page))
  72                 return (void *)page->private;
  73         return NULL;
  74 }
  75
  76 /*
  77  * Dirty a page.  Optimistically adjust accounting, on the assumption
  78  * that we won't race with invalidate.  If we do, readjust.
  79  */
  80 static bool ceph_dirty_folio(struct address_space *mapping, struct folio *folio)
  81 {
  82         struct inode *inode = mapping->host;
  83         struct ceph_client *cl = ceph_inode_to_client(inode);
  84         struct ceph_inode_info *ci;
  85         struct ceph_snap_context *snapc;
  86
  87         if (folio_test_dirty(folio)) {
  88                 doutc(cl, "%llx.%llx %p idx %lu -- already dirty\n",
  89                       ceph_vinop(inode), folio, folio->index);
  90                 VM_BUG_ON_FOLIO(!folio_test_private(folio), folio);
  91                 return false;
  92         }
  93
  94         ci = ceph_inode(inode);
  95
  96         /* dirty the head */
  97         spin_lock(&ci->i_ceph_lock);
  98         BUG_ON(ci->i_wr_ref == 0); // caller should hold Fw reference
  99         if (__ceph_have_pending_cap_snap(ci)) {
 100                 struct ceph_cap_snap *capsnap =
 101                                 list_last_entry(&ci->i_cap_snaps,
 102                                                 struct ceph_cap_snap,
 103                                                 ci_item);
 104                 snapc = ceph_get_snap_context(capsnap->context);
 105                 capsnap->dirty_pages++;
 106         } else {
 107                 BUG_ON(!ci->i_head_snapc);
 108                 snapc = ceph_get_snap_context(ci->i_head_snapc);
 109                 ++ci->i_wrbuffer_ref_head;
 110         }
 111         if (ci->i_wrbuffer_ref == 0)
 112                 ihold(inode);
 113         ++ci->i_wrbuffer_ref;
 114         doutc(cl, "%llx.%llx %p idx %lu head %d/%d -> %d/%d "
 115               "snapc %p seq %lld (%d snaps)\n",
 116               ceph_vinop(inode), folio, folio->index,
 117               ci->i_wrbuffer_ref-1, ci->i_wrbuffer_ref_head-1,
 118               ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head,
 119               snapc, snapc->seq, snapc->num_snaps);
 120         spin_unlock(&ci->i_ceph_lock);
 121
 122         /*
 123          * Reference snap context in folio->private.  Also set
 124          * PagePrivate so that we get invalidate_folio callback.
 125          */
 126         VM_WARN_ON_FOLIO(folio->private, folio);
 127         folio_attach_private(folio, snapc);
 128
 129         return ceph_fscache_dirty_folio(mapping, folio);
 130 }
 131
 132 /*
 133  * If we are truncating the full folio (i.e. offset == 0), adjust the
 134  * dirty folio counters appropriately.  Only called if there is private
 135  * data on the folio.
 136  */
 137 static void ceph_invalidate_folio(struct folio *folio, size_t offset,
 138                                 size_t length)
 139 {
 140         struct inode *inode = folio->mapping->host;
 141         struct ceph_client *cl = ceph_inode_to_client(inode);
 142         struct ceph_inode_info *ci = ceph_inode(inode);
 143         struct ceph_snap_context *snapc;
 144
 145
 146         if (offset != 0 || length != folio_size(folio)) {
 147                 doutc(cl, "%llx.%llx idx %lu partial dirty page %zu~%zu\n",
 148                       ceph_vinop(inode), folio->index, offset, length);
 149                 return;
 150         }
 151
 152         WARN_ON(!folio_test_locked(folio));
 153         if (folio_test_private(folio)) {
 154                 doutc(cl, "%llx.%llx idx %lu full dirty page\n",
 155                       ceph_vinop(inode), folio->index);
 156
 157                 snapc = folio_detach_private(folio);
 158                 ceph_put_wrbuffer_cap_refs(ci, 1, snapc);
 159                 ceph_put_snap_context(snapc);
 160         }
 161
 162         folio_wait_fscache(folio);
 163 }
 164
 165 static bool ceph_release_folio(struct folio *folio, gfp_t gfp)
 166 {
 167         struct inode *inode = folio->mapping->host;
 168         struct ceph_client *cl = ceph_inode_to_client(inode);
 169
 170         doutc(cl, "%llx.%llx idx %lu (%sdirty)\n", ceph_vinop(inode),
 171               folio->index, folio_test_dirty(folio) ? "" : "not ");
 172
 173         if (folio_test_private(folio))
 174                 return false;
 175
 176         if (folio_test_fscache(folio)) {
 177                 if (current_is_kswapd() || !(gfp & __GFP_FS))
 178                         return false;
 179                 folio_wait_fscache(folio);
 180         }
 181         ceph_fscache_note_page_release(inode);
 182         return true;
 183 }
 184
 185 static void ceph_netfs_expand_readahead(struct netfs_io_request *rreq)
 186 {
 187         struct inode *inode = rreq->inode;
 188         struct ceph_inode_info *ci = ceph_inode(inode);
 189         struct ceph_file_layout *lo = &ci->i_layout;
 190         unsigned long max_pages = inode->i_sb->s_bdi->ra_pages;
 191         loff_t end = rreq->start + rreq->len, new_end;
 192         struct ceph_netfs_request_data *priv = rreq->netfs_priv;
 193         unsigned long max_len;
 194         u32 blockoff;
 195
 196         if (priv) {
 197                 /* Readahead is disabled by posix_fadvise POSIX_FADV_RANDOM */
 198                 if (priv->file_ra_disabled)
 199                         max_pages = 0;
 200                 else
 201                         max_pages = priv->file_ra_pages;
 202
 203         }
 204
 205         /* Readahead is disabled */
 206         if (!max_pages)
 207                 return;
 208
 209         max_len = max_pages << PAGE_SHIFT;
 210
 211         /*
 212          * Try to expand the length forward by rounding up it to the next
 213          * block, but do not exceed the file size, unless the original
 214          * request already exceeds it.
 215          */
 216         new_end = min(round_up(end, lo->stripe_unit), rreq->i_size);
 217         if (new_end > end && new_end <= rreq->start + max_len)
 218                 rreq->len = new_end - rreq->start;
 219
 220         /* Try to expand the start downward */
 221         div_u64_rem(rreq->start, lo->stripe_unit, &blockoff);
 222         if (rreq->len + blockoff <= max_len) {
 223                 rreq->start -= blockoff;
 224                 rreq->len += blockoff;
 225         }
 226 }
 227
 228 static bool ceph_netfs_clamp_length(struct netfs_io_subrequest *subreq)
 229 {
 230         struct inode *inode = subreq->rreq->inode;
 231         struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
 232         struct ceph_inode_info *ci = ceph_inode(inode);
 233         u64 objno, objoff;
 234         u32 xlen;
 235
 236         /* Truncate the extent at the end of the current block */
 237         ceph_calc_file_object_mapping(&ci->i_layout, subreq->start, subreq->len,
 238                                       &objno, &objoff, &xlen);
 239         subreq->len = min(xlen, fsc->mount_options->rsize);
 240         return true;
 241 }
 242
 243 static void finish_netfs_read(struct ceph_osd_request *req)
 244 {
 245         struct inode *inode = req->r_inode;
 246         struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
 247         struct ceph_client *cl = fsc->client;
 248         struct ceph_osd_data *osd_data = osd_req_op_extent_osd_data(req, 0);
 249         struct netfs_io_subrequest *subreq = req->r_priv;
 250         struct ceph_osd_req_op *op = &req->r_ops[0];
 251         int err = req->r_result;
 252         bool sparse = (op->op == CEPH_OSD_OP_SPARSE_READ);
 253
 254         ceph_update_read_metrics(&fsc->mdsc->metric, req->r_start_latency,
 255                                  req->r_end_latency, osd_data->length, err);
 256
 257         doutc(cl, "result %d subreq->len=%zu i_size=%lld\n", req->r_result,
 258               subreq->len, i_size_read(req->r_inode));
 259
 260         /* no object means success but no data */
 261         if (err == -ENOENT)
 262                 err = 0;
 263         else if (err == -EBLOCKLISTED)
 264                 fsc->blocklisted = true;
 265
 266         if (err >= 0) {
 267                 if (sparse && err > 0)
 268                         err = ceph_sparse_ext_map_end(op);
 269                 if (err < subreq->len)
 270                         __set_bit(NETFS_SREQ_CLEAR_TAIL, &subreq->flags);
 271                 if (IS_ENCRYPTED(inode) && err > 0) {
 272                         err = ceph_fscrypt_decrypt_extents(inode,
 273                                         osd_data->pages, subreq->start,
 274                                         op->extent.sparse_ext,
 275                                         op->extent.sparse_ext_cnt);
 276                         if (err > subreq->len)
 277                                 err = subreq->len;
 278                 }
 279         }
 280
 281         if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {
 282                 ceph_put_page_vector(osd_data->pages,
 283                                      calc_pages_for(osd_data->alignment,
 284                                         osd_data->length), false);
 285         }
 286         netfs_subreq_terminated(subreq, err, false);
 287         iput(req->r_inode);
 288         ceph_dec_osd_stopping_blocker(fsc->mdsc);
 289 }
 290
 291 static bool ceph_netfs_issue_op_inline(struct netfs_io_subrequest *subreq)
 292 {
 293         struct netfs_io_request *rreq = subreq->rreq;
 294         struct inode *inode = rreq->inode;
 295         struct ceph_mds_reply_info_parsed *rinfo;
 296         struct ceph_mds_reply_info_in *iinfo;
 297         struct ceph_mds_request *req;
 298         struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
 299         struct ceph_inode_info *ci = ceph_inode(inode);
 300         struct iov_iter iter;
 301         ssize_t err = 0;
 302         size_t len;
 303         int mode;
 304
 305         __set_bit(NETFS_SREQ_CLEAR_TAIL, &subreq->flags);
 306         __clear_bit(NETFS_SREQ_COPY_TO_CACHE, &subreq->flags);
 307
 308         if (subreq->start >= inode->i_size)
 309                 goto out;
 310
 311         /* We need to fetch the inline data. */
 312         mode = ceph_try_to_choose_auth_mds(inode, CEPH_STAT_CAP_INLINE_DATA);
 313         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, mode);
 314         if (IS_ERR(req)) {
 315                 err = PTR_ERR(req);
 316                 goto out;
 317         }
 318         req->r_ino1 = ci->i_vino;
 319         req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INLINE_DATA);
 320         req->r_num_caps = 2;
 321
 322         err = ceph_mdsc_do_request(mdsc, NULL, req);
 323         if (err < 0)
 324                 goto out;
 325
 326         rinfo = &req->r_reply_info;
 327         iinfo = &rinfo->targeti;
 328         if (iinfo->inline_version == CEPH_INLINE_NONE) {
 329                 /* The data got uninlined */
 330                 ceph_mdsc_put_request(req);
 331                 return false;
 332         }
 333
 334         len = min_t(size_t, iinfo->inline_len - subreq->start, subreq->len);
 335         iov_iter_xarray(&iter, ITER_DEST, &rreq->mapping->i_pages, subreq->start, len);
 336         err = copy_to_iter(iinfo->inline_data + subreq->start, len, &iter);
 337         if (err == 0)
 338                 err = -EFAULT;
 339
 340         ceph_mdsc_put_request(req);
 341 out:
 342         netfs_subreq_terminated(subreq, err, false);
 343         return true;
 344 }
 345
 346 static void ceph_netfs_issue_read(struct netfs_io_subrequest *subreq)
 347 {
 348         struct netfs_io_request *rreq = subreq->rreq;
 349         struct inode *inode = rreq->inode;
 350         struct ceph_inode_info *ci = ceph_inode(inode);
 351         struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
 352         struct ceph_client *cl = fsc->client;
 353         struct ceph_osd_request *req = NULL;
 354         struct ceph_vino vino = ceph_vino(inode);
 355         struct iov_iter iter;
 356         int err = 0;
 357         u64 len = subreq->len;
 358         bool sparse = IS_ENCRYPTED(inode) || ceph_test_mount_opt(fsc, SPARSEREAD);
 359         u64 off = subreq->start;
 360
 361         if (ceph_inode_is_shutdown(inode)) {
 362                 err = -EIO;
 363                 goto out;
 364         }
 365
 366         if (ceph_has_inline_data(ci) && ceph_netfs_issue_op_inline(subreq))
 367                 return;
 368
 369         ceph_fscrypt_adjust_off_and_len(inode, &off, &len);
 370
 371         req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, vino,
 372                         off, &len, 0, 1, sparse ? CEPH_OSD_OP_SPARSE_READ : CEPH_OSD_OP_READ,
 373                         CEPH_OSD_FLAG_READ | fsc->client->osdc.client->options->read_from_replica,
 374                         NULL, ci->i_truncate_seq, ci->i_truncate_size, false);
 375         if (IS_ERR(req)) {
 376                 err = PTR_ERR(req);
 377                 req = NULL;
 378                 goto out;
 379         }
 380
 381         if (sparse) {
 382                 err = ceph_alloc_sparse_ext_map(&req->r_ops[0]);
 383                 if (err)
 384                         goto out;
 385         }
 386
 387         doutc(cl, "%llx.%llx pos=%llu orig_len=%zu len=%llu\n",
 388               ceph_vinop(inode), subreq->start, subreq->len, len);
 389
 390         iov_iter_xarray(&iter, ITER_DEST, &rreq->mapping->i_pages, subreq->start, len);
 391
 392         /*
 393          * FIXME: For now, use CEPH_OSD_DATA_TYPE_PAGES instead of _ITER for
 394          * encrypted inodes. We'd need infrastructure that handles an iov_iter
 395          * instead of page arrays, and we don't have that as of yet. Once the
 396          * dust settles on the write helpers and encrypt/decrypt routines for
 397          * netfs, we should be able to rework this.
 398          */
 399         if (IS_ENCRYPTED(inode)) {
 400                 struct page **pages;
 401                 size_t page_off;
 402
 403                 err = iov_iter_get_pages_alloc2(&iter, &pages, len, &page_off);
 404                 if (err < 0) {
 405                         doutc(cl, "%llx.%llx failed to allocate pages, %d\n",
 406                               ceph_vinop(inode), err);
 407                         goto out;
 408                 }
 409
 410                 /* should always give us a page-aligned read */
 411                 WARN_ON_ONCE(page_off);
 412                 len = err;
 413                 err = 0;
 414
 415                 osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, false,
 416                                                  false);
 417         } else {
 418                 osd_req_op_extent_osd_iter(req, 0, &iter);
 419         }
 420         if (!ceph_inc_osd_stopping_blocker(fsc->mdsc)) {
 421                 err = -EIO;
 422                 goto out;
 423         }
 424         req->r_callback = finish_netfs_read;
 425         req->r_priv = subreq;
 426         req->r_inode = inode;
 427         ihold(inode);
 428
 429         ceph_osdc_start_request(req->r_osdc, req);
 430 out:
 431         ceph_osdc_put_request(req);
 432         if (err)
 433                 netfs_subreq_terminated(subreq, err, false);
 434         doutc(cl, "%llx.%llx result %d\n", ceph_vinop(inode), err);
 435 }
 436
 437 static int ceph_init_request(struct netfs_io_request *rreq, struct file *file)
 438 {
 439         struct inode *inode = rreq->inode;
 440         struct ceph_client *cl = ceph_inode_to_client(inode);
 441         int got = 0, want = CEPH_CAP_FILE_CACHE;
 442         struct ceph_netfs_request_data *priv;
 443         int ret = 0;
 444
 445         if (rreq->origin != NETFS_READAHEAD)
 446                 return 0;
 447
 448         priv = kzalloc(sizeof(*priv), GFP_NOFS);
 449         if (!priv)
 450                 return -ENOMEM;
 451
 452         if (file) {
 453                 struct ceph_rw_context *rw_ctx;
 454                 struct ceph_file_info *fi = file->private_data;
 455
 456                 priv->file_ra_pages = file->f_ra.ra_pages;
 457                 priv->file_ra_disabled = file->f_mode & FMODE_RANDOM;
 458
 459                 rw_ctx = ceph_find_rw_context(fi);
 460                 if (rw_ctx) {
 461                         rreq->netfs_priv = priv;
 462                         return 0;
 463                 }
 464         }
 465
 466         /*
 467          * readahead callers do not necessarily hold Fcb caps
 468          * (e.g. fadvise, madvise).
 469          */
 470         ret = ceph_try_get_caps(inode, CEPH_CAP_FILE_RD, want, true, &got);
 471         if (ret < 0) {
 472                 doutc(cl, "%llx.%llx, error getting cap\n", ceph_vinop(inode));
 473                 goto out;
 474         }
 475
 476         if (!(got & want)) {
 477                 doutc(cl, "%llx.%llx, no cache cap\n", ceph_vinop(inode));
 478                 ret = -EACCES;
 479                 goto out;
 480         }
 481         if (ret == 0) {
 482                 ret = -EACCES;
 483                 goto out;
 484         }
 485
 486         priv->caps = got;
 487         rreq->netfs_priv = priv;
 488
 489 out:
 490         if (ret < 0)
 491                 kfree(priv);
 492
 493         return ret;
 494 }
 495
 496 static void ceph_netfs_free_request(struct netfs_io_request *rreq)
 497 {
 498         struct ceph_netfs_request_data *priv = rreq->netfs_priv;
 499
 500         if (!priv)
 501                 return;
 502
 503         if (priv->caps)
 504                 ceph_put_cap_refs(ceph_inode(rreq->inode), priv->caps);
 505         kfree(priv);
 506         rreq->netfs_priv = NULL;
 507 }
 508
 509 const struct netfs_request_ops ceph_netfs_ops = {
 510         .init_request           = ceph_init_request,
 511         .free_request           = ceph_netfs_free_request,
 512         .begin_cache_operation  = ceph_begin_cache_operation,
 513         .issue_read             = ceph_netfs_issue_read,
 514         .expand_readahead       = ceph_netfs_expand_readahead,
 515         .clamp_length           = ceph_netfs_clamp_length,
 516         .check_write_begin      = ceph_netfs_check_write_begin,
 517 };
 518
 519 #ifdef CONFIG_CEPH_FSCACHE
 520 static void ceph_set_page_fscache(struct page *page)
 521 {
 522         set_page_fscache(page);
 523 }
 524
 525 static void ceph_fscache_write_terminated(void *priv, ssize_t error, bool was_async)
 526 {
 527         struct inode *inode = priv;
 528
 529         if (IS_ERR_VALUE(error) && error != -ENOBUFS)
 530                 ceph_fscache_invalidate(inode, false);
 531 }
 532
 533 static void ceph_fscache_write_to_cache(struct inode *inode, u64 off, u64 len, bool caching)
 534 {
 535         struct ceph_inode_info *ci = ceph_inode(inode);
 536         struct fscache_cookie *cookie = ceph_fscache_cookie(ci);
 537
 538         fscache_write_to_cache(cookie, inode->i_mapping, off, len, i_size_read(inode),
 539                                ceph_fscache_write_terminated, inode, caching);
 540 }
 541 #else
 542 static inline void ceph_set_page_fscache(struct page *page)
 543 {
 544 }
 545
 546 static inline void ceph_fscache_write_to_cache(struct inode *inode, u64 off, u64 len, bool caching)
 547 {
 548 }
 549 #endif /* CONFIG_CEPH_FSCACHE */
 550
 551 struct ceph_writeback_ctl
 552 {
 553         loff_t i_size;
 554         u64 truncate_size;
 555         u32 truncate_seq;
 556         bool size_stable;
 557         bool head_snapc;
 558 };
 559
 560 /*
 561  * Get ref for the oldest snapc for an inode with dirty data... that is, the
 562  * only snap context we are allowed to write back.
 563  */
 564 static struct ceph_snap_context *
 565 get_oldest_context(struct inode *inode, struct ceph_writeback_ctl *ctl,
 566                    struct ceph_snap_context *page_snapc)
 567 {
 568         struct ceph_inode_info *ci = ceph_inode(inode);
 569         struct ceph_client *cl = ceph_inode_to_client(inode);
 570         struct ceph_snap_context *snapc = NULL;
 571         struct ceph_cap_snap *capsnap = NULL;
 572
 573         spin_lock(&ci->i_ceph_lock);
 574         list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
 575                 doutc(cl, " capsnap %p snapc %p has %d dirty pages\n",
 576                       capsnap, capsnap->context, capsnap->dirty_pages);
 577                 if (!capsnap->dirty_pages)
 578                         continue;
 579
 580                 /* get i_size, truncate_{seq,size} for page_snapc? */
 581                 if (snapc && capsnap->context != page_snapc)
 582                         continue;
 583
 584                 if (ctl) {
 585                         if (capsnap->writing) {
 586                                 ctl->i_size = i_size_read(inode);
 587                                 ctl->size_stable = false;
 588                         } else {
 589                                 ctl->i_size = capsnap->size;
 590                                 ctl->size_stable = true;
 591                         }
 592                         ctl->truncate_size = capsnap->truncate_size;
 593                         ctl->truncate_seq = capsnap->truncate_seq;
 594                         ctl->head_snapc = false;
 595                 }
 596
 597                 if (snapc)
 598                         break;
 599
 600                 snapc = ceph_get_snap_context(capsnap->context);
 601                 if (!page_snapc ||
 602                     page_snapc == snapc ||
 603                     page_snapc->seq > snapc->seq)
 604                         break;
 605         }
 606         if (!snapc && ci->i_wrbuffer_ref_head) {
 607                 snapc = ceph_get_snap_context(ci->i_head_snapc);
 608                 doutc(cl, " head snapc %p has %d dirty pages\n", snapc,
 609                       ci->i_wrbuffer_ref_head);
 610                 if (ctl) {
 611                         ctl->i_size = i_size_read(inode);
 612                         ctl->truncate_size = ci->i_truncate_size;
 613                         ctl->truncate_seq = ci->i_truncate_seq;
 614                         ctl->size_stable = false;
 615                         ctl->head_snapc = true;
 616                 }
 617         }
 618         spin_unlock(&ci->i_ceph_lock);
 619         return snapc;
 620 }
 621
 622 static u64 get_writepages_data_length(struct inode *inode,
 623                                       struct page *page, u64 start)
 624 {
 625         struct ceph_inode_info *ci = ceph_inode(inode);
 626         struct ceph_snap_context *snapc;
 627         struct ceph_cap_snap *capsnap = NULL;
 628         u64 end = i_size_read(inode);
 629         u64 ret;
 630
 631         snapc = page_snap_context(ceph_fscrypt_pagecache_page(page));
 632         if (snapc != ci->i_head_snapc) {
 633                 bool found = false;
 634                 spin_lock(&ci->i_ceph_lock);
 635                 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
 636                         if (capsnap->context == snapc) {
 637                                 if (!capsnap->writing)
 638                                         end = capsnap->size;
 639                                 found = true;
 640                                 break;
 641                         }
 642                 }
 643                 spin_unlock(&ci->i_ceph_lock);
 644                 WARN_ON(!found);
 645         }
 646         if (end > ceph_fscrypt_page_offset(page) + thp_size(page))
 647                 end = ceph_fscrypt_page_offset(page) + thp_size(page);
 648         ret = end > start ? end - start : 0;
 649         if (ret && fscrypt_is_bounce_page(page))
 650                 ret = round_up(ret, CEPH_FSCRYPT_BLOCK_SIZE);
 651         return ret;
 652 }
 653
 654 /*
 655  * Write a single page, but leave the page locked.
 656  *
 657  * If we get a write error, mark the mapping for error, but still adjust the
 658  * dirty page accounting (i.e., page is no longer dirty).
 659  */
 660 static int writepage_nounlock(struct page *page, struct writeback_control *wbc)
 661 {
 662         struct folio *folio = page_folio(page);
 663         struct inode *inode = page->mapping->host;
 664         struct ceph_inode_info *ci = ceph_inode(inode);
 665         struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
 666         struct ceph_client *cl = fsc->client;
 667         struct ceph_snap_context *snapc, *oldest;
 668         loff_t page_off = page_offset(page);
 669         int err;
 670         loff_t len = thp_size(page);
 671         loff_t wlen;
 672         struct ceph_writeback_ctl ceph_wbc;
 673         struct ceph_osd_client *osdc = &fsc->client->osdc;
 674         struct ceph_osd_request *req;
 675         bool caching = ceph_is_cache_enabled(inode);
 676         struct page *bounce_page = NULL;
 677
 678         doutc(cl, "%llx.%llx page %p idx %lu\n", ceph_vinop(inode), page,
 679               page->index);
 680
 681         if (ceph_inode_is_shutdown(inode))
 682                 return -EIO;
 683
 684         /* verify this is a writeable snap context */
 685         snapc = page_snap_context(page);
 686         if (!snapc) {
 687                 doutc(cl, "%llx.%llx page %p not dirty?\n", ceph_vinop(inode),
 688                       page);
 689                 return 0;
 690         }
 691         oldest = get_oldest_context(inode, &ceph_wbc, snapc);
 692         if (snapc->seq > oldest->seq) {
 693                 doutc(cl, "%llx.%llx page %p snapc %p not writeable - noop\n",
 694                       ceph_vinop(inode), page, snapc);
 695                 /* we should only noop if called by kswapd */
 696                 WARN_ON(!(current->flags & PF_MEMALLOC));
 697                 ceph_put_snap_context(oldest);
 698                 redirty_page_for_writepage(wbc, page);
 699                 return 0;
 700         }
 701         ceph_put_snap_context(oldest);
 702
 703         /* is this a partial page at end of file? */
 704         if (page_off >= ceph_wbc.i_size) {
 705                 doutc(cl, "%llx.%llx folio at %lu beyond eof %llu\n",
 706                       ceph_vinop(inode), folio->index, ceph_wbc.i_size);
 707                 folio_invalidate(folio, 0, folio_size(folio));
 708                 return 0;
 709         }
 710
 711         if (ceph_wbc.i_size < page_off + len)
 712                 len = ceph_wbc.i_size - page_off;
 713
 714         wlen = IS_ENCRYPTED(inode) ? round_up(len, CEPH_FSCRYPT_BLOCK_SIZE) : len;
 715         doutc(cl, "%llx.%llx page %p index %lu on %llu~%llu snapc %p seq %lld\n",
 716               ceph_vinop(inode), page, page->index, page_off, wlen, snapc,
 717               snapc->seq);
 718
 719         if (atomic_long_inc_return(&fsc->writeback_count) >
 720             CONGESTION_ON_THRESH(fsc->mount_options->congestion_kb))
 721                 fsc->write_congested = true;
 722
 723         req = ceph_osdc_new_request(osdc, &ci->i_layout, ceph_vino(inode),
 724                                     page_off, &wlen, 0, 1, CEPH_OSD_OP_WRITE,
 725                                     CEPH_OSD_FLAG_WRITE, snapc,
 726                                     ceph_wbc.truncate_seq,
 727                                     ceph_wbc.truncate_size, true);
 728         if (IS_ERR(req)) {
 729                 redirty_page_for_writepage(wbc, page);
 730                 return PTR_ERR(req);
 731         }
 732
 733         if (wlen < len)
 734                 len = wlen;
 735
 736         set_page_writeback(page);
 737         if (caching)
 738                 ceph_set_page_fscache(page);
 739         ceph_fscache_write_to_cache(inode, page_off, len, caching);
 740
 741         if (IS_ENCRYPTED(inode)) {
 742                 bounce_page = fscrypt_encrypt_pagecache_blocks(page,
 743                                                     CEPH_FSCRYPT_BLOCK_SIZE, 0,
 744                                                     GFP_NOFS);
 745                 if (IS_ERR(bounce_page)) {
 746                         redirty_page_for_writepage(wbc, page);
 747                         end_page_writeback(page);
 748                         ceph_osdc_put_request(req);
 749                         return PTR_ERR(bounce_page);
 750                 }
 751         }
 752
 753         /* it may be a short write due to an object boundary */
 754         WARN_ON_ONCE(len > thp_size(page));
 755         osd_req_op_extent_osd_data_pages(req, 0,
 756                         bounce_page ? &bounce_page : &page, wlen, 0,
 757                         false, false);
 758         doutc(cl, "%llx.%llx %llu~%llu (%llu bytes, %sencrypted)\n",
 759               ceph_vinop(inode), page_off, len, wlen,
 760               IS_ENCRYPTED(inode) ? "" : "not ");
 761
 762         req->r_mtime = inode_get_mtime(inode);
 763         ceph_osdc_start_request(osdc, req);
 764         err = ceph_osdc_wait_request(osdc, req);
 765
 766         ceph_update_write_metrics(&fsc->mdsc->metric, req->r_start_latency,
 767                                   req->r_end_latency, len, err);
 768         fscrypt_free_bounce_page(bounce_page);
 769         ceph_osdc_put_request(req);
 770         if (err == 0)
 771                 err = len;
 772
 773         if (err < 0) {
 774                 struct writeback_control tmp_wbc;
 775                 if (!wbc)
 776                         wbc = &tmp_wbc;
 777                 if (err == -ERESTARTSYS) {
 778                         /* killed by SIGKILL */
 779                         doutc(cl, "%llx.%llx interrupted page %p\n",
 780                               ceph_vinop(inode), page);
 781                         redirty_page_for_writepage(wbc, page);
 782                         end_page_writeback(page);
 783                         return err;
 784                 }
 785                 if (err == -EBLOCKLISTED)
 786                         fsc->blocklisted = true;
 787                 doutc(cl, "%llx.%llx setting page/mapping error %d %p\n",
 788                       ceph_vinop(inode), err, page);
 789                 mapping_set_error(&inode->i_data, err);
 790                 wbc->pages_skipped++;
 791         } else {
 792                 doutc(cl, "%llx.%llx cleaned page %p\n",
 793                       ceph_vinop(inode), page);
 794                 err = 0;  /* vfs expects us to return 0 */
 795         }
 796         oldest = detach_page_private(page);
 797         WARN_ON_ONCE(oldest != snapc);
 798         end_page_writeback(page);
 799         ceph_put_wrbuffer_cap_refs(ci, 1, snapc);
 800         ceph_put_snap_context(snapc);  /* page's reference */
 801
 802         if (atomic_long_dec_return(&fsc->writeback_count) <
 803             CONGESTION_OFF_THRESH(fsc->mount_options->congestion_kb))
 804                 fsc->write_congested = false;
 805
 806         return err;
 807 }
 808
 809 static int ceph_writepage(struct page *page, struct writeback_control *wbc)
 810 {
 811         int err;
 812         struct inode *inode = page->mapping->host;
 813         BUG_ON(!inode);
 814         ihold(inode);
 815
 816         if (wbc->sync_mode == WB_SYNC_NONE &&
 817             ceph_inode_to_fs_client(inode)->write_congested)
 818                 return AOP_WRITEPAGE_ACTIVATE;
 819
 820         wait_on_page_fscache(page);
 821
 822         err = writepage_nounlock(page, wbc);
 823         if (err == -ERESTARTSYS) {
 824                 /* direct memory reclaimer was killed by SIGKILL. return 0
 825                  * to prevent caller from setting mapping/page error */
 826                 err = 0;
 827         }
 828         unlock_page(page);
 829         iput(inode);
 830         return err;
 831 }
 832
 833 /*
 834  * async writeback completion handler.
 835  *
 836  * If we get an error, set the mapping error bit, but not the individual
 837  * page error bits.
 838  */
 839 static void writepages_finish(struct ceph_osd_request *req)
 840 {
 841         struct inode *inode = req->r_inode;
 842         struct ceph_inode_info *ci = ceph_inode(inode);
 843         struct ceph_client *cl = ceph_inode_to_client(inode);
 844         struct ceph_osd_data *osd_data;
 845         struct page *page;
 846         int num_pages, total_pages = 0;
 847         int i, j;
 848         int rc = req->r_result;
 849         struct ceph_snap_context *snapc = req->r_snapc;
 850         struct address_space *mapping = inode->i_mapping;
 851         struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
 852         unsigned int len = 0;
 853         bool remove_page;
 854
 855         doutc(cl, "%llx.%llx rc %d\n", ceph_vinop(inode), rc);
 856         if (rc < 0) {
 857                 mapping_set_error(mapping, rc);
 858                 ceph_set_error_write(ci);
 859                 if (rc == -EBLOCKLISTED)
 860                         fsc->blocklisted = true;
 861         } else {
 862                 ceph_clear_error_write(ci);
 863         }
 864
 865         /*
 866          * We lost the cache cap, need to truncate the page before
 867          * it is unlocked, otherwise we'd truncate it later in the
 868          * page truncation thread, possibly losing some data that
 869          * raced its way in
 870          */
 871         remove_page = !(ceph_caps_issued(ci) &
 872                         (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO));
 873
 874         /* clean all pages */
 875         for (i = 0; i < req->r_num_ops; i++) {
 876                 if (req->r_ops[i].op != CEPH_OSD_OP_WRITE) {
 877                         pr_warn_client(cl,
 878                                 "%llx.%llx incorrect op %d req %p index %d tid %llu\n",
 879                                 ceph_vinop(inode), req->r_ops[i].op, req, i,
 880                                 req->r_tid);
 881                         break;
 882                 }
 883
 884                 osd_data = osd_req_op_extent_osd_data(req, i);
 885                 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES);
 886                 len += osd_data->length;
 887                 num_pages = calc_pages_for((u64)osd_data->alignment,
 888                                            (u64)osd_data->length);
 889                 total_pages += num_pages;
 890                 for (j = 0; j < num_pages; j++) {
 891                         page = osd_data->pages[j];
 892                         if (fscrypt_is_bounce_page(page)) {
 893                                 page = fscrypt_pagecache_page(page);
 894                                 fscrypt_free_bounce_page(osd_data->pages[j]);
 895                                 osd_data->pages[j] = page;
 896                         }
 897                         BUG_ON(!page);
 898                         WARN_ON(!PageUptodate(page));
 899
 900                         if (atomic_long_dec_return(&fsc->writeback_count) <
 901                              CONGESTION_OFF_THRESH(
 902                                         fsc->mount_options->congestion_kb))
 903                                 fsc->write_congested = false;
 904
 905                         ceph_put_snap_context(detach_page_private(page));
 906                         end_page_writeback(page);
 907                         doutc(cl, "unlocking %p\n", page);
 908
 909                         if (remove_page)
 910                                 generic_error_remove_page(inode->i_mapping,
 911                                                           page);
 912
 913                         unlock_page(page);
 914                 }
 915                 doutc(cl, "%llx.%llx wrote %llu bytes cleaned %d pages\n",
 916                       ceph_vinop(inode), osd_data->length,
 917                       rc >= 0 ? num_pages : 0);
 918
 919                 release_pages(osd_data->pages, num_pages);
 920         }
 921
 922         ceph_update_write_metrics(&fsc->mdsc->metric, req->r_start_latency,
 923                                   req->r_end_latency, len, rc);
 924
 925         ceph_put_wrbuffer_cap_refs(ci, total_pages, snapc);
 926
 927         osd_data = osd_req_op_extent_osd_data(req, 0);
 928         if (osd_data->pages_from_pool)
 929                 mempool_free(osd_data->pages, ceph_wb_pagevec_pool);
 930         else
 931                 kfree(osd_data->pages);
 932         ceph_osdc_put_request(req);
 933         ceph_dec_osd_stopping_blocker(fsc->mdsc);
 934 }
 935
 936 /*
 937  * initiate async writeback
 938  */
 939 static int ceph_writepages_start(struct address_space *mapping,
 940                                  struct writeback_control *wbc)
 941 {
 942         struct inode *inode = mapping->host;
 943         struct ceph_inode_info *ci = ceph_inode(inode);
 944         struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
 945         struct ceph_client *cl = fsc->client;
 946         struct ceph_vino vino = ceph_vino(inode);
 947         pgoff_t index, start_index, end = -1;
 948         struct ceph_snap_context *snapc = NULL, *last_snapc = NULL, *pgsnapc;
 949         struct folio_batch fbatch;
 950         int rc = 0;
 951         unsigned int wsize = i_blocksize(inode);
 952         struct ceph_osd_request *req = NULL;
 953         struct ceph_writeback_ctl ceph_wbc;
 954         bool should_loop, range_whole = false;
 955         bool done = false;
 956         bool caching = ceph_is_cache_enabled(inode);
 957         xa_mark_t tag;
 958
 959         if (wbc->sync_mode == WB_SYNC_NONE &&
 960             fsc->write_congested)
 961                 return 0;
 962
 963         doutc(cl, "%llx.%llx (mode=%s)\n", ceph_vinop(inode),
 964               wbc->sync_mode == WB_SYNC_NONE ? "NONE" :
 965               (wbc->sync_mode == WB_SYNC_ALL ? "ALL" : "HOLD"));
 966
 967         if (ceph_inode_is_shutdown(inode)) {
 968                 if (ci->i_wrbuffer_ref > 0) {
 969                         pr_warn_ratelimited_client(cl,
 970                                 "%llx.%llx %lld forced umount\n",
 971                                 ceph_vinop(inode), ceph_ino(inode));
 972                 }
 973                 mapping_set_error(mapping, -EIO);
 974                 return -EIO; /* we're in a forced umount, don't write! */
 975         }
 976         if (fsc->mount_options->wsize < wsize)
 977                 wsize = fsc->mount_options->wsize;
 978
 979         folio_batch_init(&fbatch);
 980
 981         start_index = wbc->range_cyclic ? mapping->writeback_index : 0;
 982         index = start_index;
 983
 984         if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) {
 985                 tag = PAGECACHE_TAG_TOWRITE;
 986         } else {
 987                 tag = PAGECACHE_TAG_DIRTY;
 988         }
 989 retry:
 990         /* find oldest snap context with dirty data */
 991         snapc = get_oldest_context(inode, &ceph_wbc, NULL);
 992         if (!snapc) {
 993                 /* hmm, why does writepages get called when there
 994                    is no dirty data? */
 995                 doutc(cl, " no snap context with dirty data?\n");
 996                 goto out;
 997         }
 998         doutc(cl, " oldest snapc is %p seq %lld (%d snaps)\n", snapc,
 999               snapc->seq, snapc->num_snaps);
1000
1001         should_loop = false;
1002         if (ceph_wbc.head_snapc && snapc != last_snapc) {
1003                 /* where to start/end? */
1004                 if (wbc->range_cyclic) {
1005                         index = start_index;
1006                         end = -1;
1007                         if (index > 0)
1008                                 should_loop = true;
1009                         doutc(cl, " cyclic, start at %lu\n", index);
1010                 } else {
1011                         index = wbc->range_start >> PAGE_SHIFT;
1012                         end = wbc->range_end >> PAGE_SHIFT;
1013                         if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
1014                                 range_whole = true;
1015                         doutc(cl, " not cyclic, %lu to %lu\n", index, end);
1016                 }
1017         } else if (!ceph_wbc.head_snapc) {
1018                 /* Do not respect wbc->range_{start,end}. Dirty pages
1019                  * in that range can be associated with newer snapc.
1020                  * They are not writeable until we write all dirty pages
1021                  * associated with 'snapc' get written */
1022                 if (index > 0)
1023                         should_loop = true;
1024                 doutc(cl, " non-head snapc, range whole\n");
1025         }
1026
1027         if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)
1028                 tag_pages_for_writeback(mapping, index, end);
1029
1030         ceph_put_snap_context(last_snapc);
1031         last_snapc = snapc;
1032
1033         while (!done && index <= end) {
1034                 int num_ops = 0, op_idx;
1035                 unsigned i, nr_folios, max_pages, locked_pages = 0;
1036                 struct page **pages = NULL, **data_pages;
1037                 struct page *page;
1038                 pgoff_t strip_unit_end = 0;
1039                 u64 offset = 0, len = 0;
1040                 bool from_pool = false;
1041
1042                 max_pages = wsize >> PAGE_SHIFT;
1043
1044 get_more_pages:
1045                 nr_folios = filemap_get_folios_tag(mapping, &index,
1046                                                    end, tag, &fbatch);
1047                 doutc(cl, "pagevec_lookup_range_tag got %d\n", nr_folios);
1048                 if (!nr_folios && !locked_pages)
1049                         break;
1050                 for (i = 0; i < nr_folios && locked_pages < max_pages; i++) {
1051                         page = &fbatch.folios[i]->page;
1052                         doutc(cl, "? %p idx %lu\n", page, page->index);
1053                         if (locked_pages == 0)
1054                                 lock_page(page);  /* first page */
1055                         else if (!trylock_page(page))
1056                                 break;
1057
1058                         /* only dirty pages, or our accounting breaks */
1059                         if (unlikely(!PageDirty(page)) ||
1060                             unlikely(page->mapping != mapping)) {
1061                                 doutc(cl, "!dirty or !mapping %p\n", page);
1062                                 unlock_page(page);
1063                                 continue;
1064                         }
1065                         /* only if matching snap context */
1066                         pgsnapc = page_snap_context(page);
1067                         if (pgsnapc != snapc) {
1068                                 doutc(cl, "page snapc %p %lld != oldest %p %lld\n",
1069                                       pgsnapc, pgsnapc->seq, snapc, snapc->seq);
1070                                 if (!should_loop &&
1071                                     !ceph_wbc.head_snapc &&
1072                                     wbc->sync_mode != WB_SYNC_NONE)
1073                                         should_loop = true;
1074                                 unlock_page(page);
1075                                 continue;
1076                         }
1077                         if (page_offset(page) >= ceph_wbc.i_size) {
1078                                 struct folio *folio = page_folio(page);
1079
1080                                 doutc(cl, "folio at %lu beyond eof %llu\n",
1081                                       folio->index, ceph_wbc.i_size);
1082                                 if ((ceph_wbc.size_stable ||
1083                                     folio_pos(folio) >= i_size_read(inode)) &&
1084                                     folio_clear_dirty_for_io(folio))
1085                                         folio_invalidate(folio, 0,
1086                                                         folio_size(folio));
1087                                 folio_unlock(folio);
1088                                 continue;
1089                         }
1090                         if (strip_unit_end && (page->index > strip_unit_end)) {
1091                                 doutc(cl, "end of strip unit %p\n", page);
1092                                 unlock_page(page);
1093                                 break;
1094                         }
1095                         if (PageWriteback(page) || PageFsCache(page)) {
1096                                 if (wbc->sync_mode == WB_SYNC_NONE) {
1097                                         doutc(cl, "%p under writeback\n", page);
1098                                         unlock_page(page);
1099                                         continue;
1100                                 }
1101                                 doutc(cl, "waiting on writeback %p\n", page);
1102                                 wait_on_page_writeback(page);
1103                                 wait_on_page_fscache(page);
1104                         }
1105
1106                         if (!clear_page_dirty_for_io(page)) {
1107                                 doutc(cl, "%p !clear_page_dirty_for_io\n", page);
1108                                 unlock_page(page);
1109                                 continue;
1110                         }
1111
1112                         /*
1113                          * We have something to write.  If this is
1114                          * the first locked page this time through,
1115                          * calculate max possinle write size and
1116                          * allocate a page array
1117                          */
1118                         if (locked_pages == 0) {
1119                                 u64 objnum;
1120                                 u64 objoff;
1121                                 u32 xlen;
1122
1123                                 /* prepare async write request */
1124                                 offset = (u64)page_offset(page);
1125                                 ceph_calc_file_object_mapping(&ci->i_layout,
1126                                                               offset, wsize,
1127                                                               &objnum, &objoff,
1128                                                               &xlen);
1129                                 len = xlen;
1130
1131                                 num_ops = 1;
1132                                 strip_unit_end = page->index +
1133                                         ((len - 1) >> PAGE_SHIFT);
1134
1135                                 BUG_ON(pages);
1136                                 max_pages = calc_pages_for(0, (u64)len);
1137                                 pages = kmalloc_array(max_pages,
1138                                                       sizeof(*pages),
1139                                                       GFP_NOFS);
1140                                 if (!pages) {
1141                                         from_pool = true;
1142                                         pages = mempool_alloc(ceph_wb_pagevec_pool, GFP_NOFS);
1143                                         BUG_ON(!pages);
1144                                 }
1145
1146                                 len = 0;
1147                         } else if (page->index !=
1148                                    (offset + len) >> PAGE_SHIFT) {
1149                                 if (num_ops >= (from_pool ?  CEPH_OSD_SLAB_OPS :
1150                                                              CEPH_OSD_MAX_OPS)) {
1151                                         redirty_page_for_writepage(wbc, page);
1152                                         unlock_page(page);
1153                                         break;
1154                                 }
1155
1156                                 num_ops++;
1157                                 offset = (u64)page_offset(page);
1158                                 len = 0;
1159                         }
1160
1161                         /* note position of first page in fbatch */
1162                         doutc(cl, "%llx.%llx will write page %p idx %lu\n",
1163                               ceph_vinop(inode), page, page->index);
1164
1165                         if (atomic_long_inc_return(&fsc->writeback_count) >
1166                             CONGESTION_ON_THRESH(
1167                                     fsc->mount_options->congestion_kb))
1168                                 fsc->write_congested = true;
1169
1170                         if (IS_ENCRYPTED(inode)) {
1171                                 pages[locked_pages] =
1172                                         fscrypt_encrypt_pagecache_blocks(page,
1173                                                 PAGE_SIZE, 0,
1174                                                 locked_pages ? GFP_NOWAIT : GFP_NOFS);
1175                                 if (IS_ERR(pages[locked_pages])) {
1176                                         if (PTR_ERR(pages[locked_pages]) == -EINVAL)
1177                                                 pr_err_client(cl,
1178                                                         "inode->i_blkbits=%hhu\n",
1179                                                         inode->i_blkbits);
1180                                         /* better not fail on first page! */
1181                                         BUG_ON(locked_pages == 0);
1182                                         pages[locked_pages] = NULL;
1183                                         redirty_page_for_writepage(wbc, page);
1184                                         unlock_page(page);
1185                                         break;
1186                                 }
1187                                 ++locked_pages;
1188                         } else {
1189                                 pages[locked_pages++] = page;
1190                         }
1191
1192                         fbatch.folios[i] = NULL;
1193                         len += thp_size(page);
1194                 }
1195
1196                 /* did we get anything? */
1197                 if (!locked_pages)
1198                         goto release_folios;
1199                 if (i) {
1200                         unsigned j, n = 0;
1201                         /* shift unused page to beginning of fbatch */
1202                         for (j = 0; j < nr_folios; j++) {
1203                                 if (!fbatch.folios[j])
1204                                         continue;
1205                                 if (n < j)
1206                                         fbatch.folios[n] = fbatch.folios[j];
1207                                 n++;
1208                         }
1209                         fbatch.nr = n;
1210
1211                         if (nr_folios && i == nr_folios &&
1212                             locked_pages < max_pages) {
1213                                 doutc(cl, "reached end fbatch, trying for more\n");
1214                                 folio_batch_release(&fbatch);
1215                                 goto get_more_pages;
1216                         }
1217                 }
1218
1219 new_request:
1220                 offset = ceph_fscrypt_page_offset(pages[0]);
1221                 len = wsize;
1222
1223                 req = ceph_osdc_new_request(&fsc->client->osdc,
1224                                         &ci->i_layout, vino,
1225                                         offset, &len, 0, num_ops,
1226                                         CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE,
1227                                         snapc, ceph_wbc.truncate_seq,
1228                                         ceph_wbc.truncate_size, false);
1229                 if (IS_ERR(req)) {
1230                         req = ceph_osdc_new_request(&fsc->client->osdc,
1231                                                 &ci->i_layout, vino,
1232                                                 offset, &len, 0,
1233                                                 min(num_ops,
1234                                                     CEPH_OSD_SLAB_OPS),
1235                                                 CEPH_OSD_OP_WRITE,
1236                                                 CEPH_OSD_FLAG_WRITE,
1237                                                 snapc, ceph_wbc.truncate_seq,
1238                                                 ceph_wbc.truncate_size, true);
1239                         BUG_ON(IS_ERR(req));
1240                 }
1241                 BUG_ON(len < ceph_fscrypt_page_offset(pages[locked_pages - 1]) +
1242                              thp_size(pages[locked_pages - 1]) - offset);
1243
1244                 if (!ceph_inc_osd_stopping_blocker(fsc->mdsc)) {
1245                         rc = -EIO;
1246                         goto release_folios;
1247                 }
1248                 req->r_callback = writepages_finish;
1249                 req->r_inode = inode;
1250
1251                 /* Format the osd request message and submit the write */
1252                 len = 0;
1253                 data_pages = pages;
1254                 op_idx = 0;
1255                 for (i = 0; i < locked_pages; i++) {
1256                         struct page *page = ceph_fscrypt_pagecache_page(pages[i]);
1257
1258                         u64 cur_offset = page_offset(page);
1259                         /*
1260                          * Discontinuity in page range? Ceph can handle that by just passing
1261                          * multiple extents in the write op.
1262                          */
1263                         if (offset + len != cur_offset) {
1264                                 /* If it's full, stop here */
1265                                 if (op_idx + 1 == req->r_num_ops)
1266                                         break;
1267
1268                                 /* Kick off an fscache write with what we have so far. */
1269                                 ceph_fscache_write_to_cache(inode, offset, len, caching);
1270
1271                                 /* Start a new extent */
1272                                 osd_req_op_extent_dup_last(req, op_idx,
1273                                                            cur_offset - offset);
1274                                 doutc(cl, "got pages at %llu~%llu\n", offset,
1275                                       len);
1276                                 osd_req_op_extent_osd_data_pages(req, op_idx,
1277                                                         data_pages, len, 0,
1278                                                         from_pool, false);
1279                                 osd_req_op_extent_update(req, op_idx, len);
1280
1281                                 len = 0;
1282                                 offset = cur_offset;
1283                                 data_pages = pages + i;
1284                                 op_idx++;
1285                         }
1286
1287                         set_page_writeback(page);
1288                         if (caching)
1289                                 ceph_set_page_fscache(page);
1290                         len += thp_size(page);
1291                 }
1292                 ceph_fscache_write_to_cache(inode, offset, len, caching);
1293
1294                 if (ceph_wbc.size_stable) {
1295                         len = min(len, ceph_wbc.i_size - offset);
1296                 } else if (i == locked_pages) {
1297                         /* writepages_finish() clears writeback pages
1298                          * according to the data length, so make sure
1299                          * data length covers all locked pages */
1300                         u64 min_len = len + 1 - thp_size(page);
1301                         len = get_writepages_data_length(inode, pages[i - 1],
1302                                                          offset);
1303                         len = max(len, min_len);
1304                 }
1305                 if (IS_ENCRYPTED(inode))
1306                         len = round_up(len, CEPH_FSCRYPT_BLOCK_SIZE);
1307
1308                 doutc(cl, "got pages at %llu~%llu\n", offset, len);
1309
1310                 if (IS_ENCRYPTED(inode) &&
1311                     ((offset | len) & ~CEPH_FSCRYPT_BLOCK_MASK))
1312                         pr_warn_client(cl,
1313                                 "bad encrypted write offset=%lld len=%llu\n",
1314                                 offset, len);
1315
1316                 osd_req_op_extent_osd_data_pages(req, op_idx, data_pages, len,
1317                                                  0, from_pool, false);
1318                 osd_req_op_extent_update(req, op_idx, len);
1319
1320                 BUG_ON(op_idx + 1 != req->r_num_ops);
1321
1322                 from_pool = false;
1323                 if (i < locked_pages) {
1324                         BUG_ON(num_ops <= req->r_num_ops);
1325                         num_ops -= req->r_num_ops;
1326                         locked_pages -= i;
1327
1328                         /* allocate new pages array for next request */
1329                         data_pages = pages;
1330                         pages = kmalloc_array(locked_pages, sizeof(*pages),
1331                                               GFP_NOFS);
1332                         if (!pages) {
1333                                 from_pool = true;
1334                                 pages = mempool_alloc(ceph_wb_pagevec_pool, GFP_NOFS);
1335                                 BUG_ON(!pages);
1336                         }
1337                         memcpy(pages, data_pages + i,
1338                                locked_pages * sizeof(*pages));
1339                         memset(data_pages + i, 0,
1340                                locked_pages * sizeof(*pages));
1341                 } else {
1342                         BUG_ON(num_ops != req->r_num_ops);
1343                         index = pages[i - 1]->index + 1;
1344                         /* request message now owns the pages array */
1345                         pages = NULL;
1346                 }
1347
1348                 req->r_mtime = inode_get_mtime(inode);
1349                 ceph_osdc_start_request(&fsc->client->osdc, req);
1350                 req = NULL;
1351
1352                 wbc->nr_to_write -= i;
1353                 if (pages)
1354                         goto new_request;
1355
1356                 /*
1357                  * We stop writing back only if we are not doing
1358                  * integrity sync. In case of integrity sync we have to
1359                  * keep going until we have written all the pages
1360                  * we tagged for writeback prior to entering this loop.
1361                  */
1362                 if (wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE)
1363                         done = true;
1364
1365 release_folios:
1366                 doutc(cl, "folio_batch release on %d folios (%p)\n",
1367                       (int)fbatch.nr, fbatch.nr ? fbatch.folios[0] : NULL);
1368                 folio_batch_release(&fbatch);
1369         }
1370
1371         if (should_loop && !done) {
1372                 /* more to do; loop back to beginning of file */
1373                 doutc(cl, "looping back to beginning of file\n");
1374                 end = start_index - 1; /* OK even when start_index == 0 */
1375
1376                 /* to write dirty pages associated with next snapc,
1377                  * we need to wait until current writes complete */
1378                 if (wbc->sync_mode != WB_SYNC_NONE &&
1379                     start_index == 0 && /* all dirty pages were checked */
1380                     !ceph_wbc.head_snapc) {
1381                         struct page *page;
1382                         unsigned i, nr;
1383                         index = 0;
1384                         while ((index <= end) &&
1385                                (nr = filemap_get_folios_tag(mapping, &index,
1386                                                 (pgoff_t)-1,
1387                                                 PAGECACHE_TAG_WRITEBACK,
1388                                                 &fbatch))) {
1389                                 for (i = 0; i < nr; i++) {
1390                                         page = &fbatch.folios[i]->page;
1391                                         if (page_snap_context(page) != snapc)
1392                                                 continue;
1393                                         wait_on_page_writeback(page);
1394                                 }
1395                                 folio_batch_release(&fbatch);
1396                                 cond_resched();
1397                         }
1398                 }
1399
1400                 start_index = 0;
1401                 index = 0;
1402                 goto retry;
1403         }
1404
1405         if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
1406                 mapping->writeback_index = index;
1407
1408 out:
1409         ceph_osdc_put_request(req);
1410         ceph_put_snap_context(last_snapc);
1411         doutc(cl, "%llx.%llx dend - startone, rc = %d\n", ceph_vinop(inode),
1412               rc);
1413         return rc;
1414 }
1415
1416
1417
1418 /*
1419  * See if a given @snapc is either writeable, or already written.
1420  */
1421 static int context_is_writeable_or_written(struct inode *inode,
1422                                            struct ceph_snap_context *snapc)
1423 {
1424         struct ceph_snap_context *oldest = get_oldest_context(inode, NULL, NULL);
1425         int ret = !oldest || snapc->seq <= oldest->seq;
1426
1427         ceph_put_snap_context(oldest);
1428         return ret;
1429 }
1430
1431 /**
1432  * ceph_find_incompatible - find an incompatible context and return it
1433  * @page: page being dirtied
1434  *
1435  * We are only allowed to write into/dirty a page if the page is
1436  * clean, or already dirty within the same snap context. Returns a
1437  * conflicting context if there is one, NULL if there isn't, or a
1438  * negative error code on other errors.
1439  *
1440  * Must be called with page lock held.
1441  */
1442 static struct ceph_snap_context *
1443 ceph_find_incompatible(struct page *page)
1444 {
1445         struct inode *inode = page->mapping->host;
1446         struct ceph_client *cl = ceph_inode_to_client(inode);
1447         struct ceph_inode_info *ci = ceph_inode(inode);
1448
1449         if (ceph_inode_is_shutdown(inode)) {
1450                 doutc(cl, " %llx.%llx page %p is shutdown\n",
1451                       ceph_vinop(inode), page);
1452                 return ERR_PTR(-ESTALE);
1453         }
1454
1455         for (;;) {
1456                 struct ceph_snap_context *snapc, *oldest;
1457
1458                 wait_on_page_writeback(page);
1459
1460                 snapc = page_snap_context(page);
1461                 if (!snapc || snapc == ci->i_head_snapc)
1462                         break;
1463
1464                 /*
1465                  * this page is already dirty in another (older) snap
1466                  * context!  is it writeable now?
1467                  */
1468                 oldest = get_oldest_context(inode, NULL, NULL);
1469                 if (snapc->seq > oldest->seq) {
1470                         /* not writeable -- return it for the caller to deal with */
1471                         ceph_put_snap_context(oldest);
1472                         doutc(cl, " %llx.%llx page %p snapc %p not current or oldest\n",
1473                               ceph_vinop(inode), page, snapc);
1474                         return ceph_get_snap_context(snapc);
1475                 }
1476                 ceph_put_snap_context(oldest);
1477
1478                 /* yay, writeable, do it now (without dropping page lock) */
1479                 doutc(cl, " %llx.%llx page %p snapc %p not current, but oldest\n",
1480                       ceph_vinop(inode), page, snapc);
1481                 if (clear_page_dirty_for_io(page)) {
1482                         int r = writepage_nounlock(page, NULL);
1483                         if (r < 0)
1484                                 return ERR_PTR(r);
1485                 }
1486         }
1487         return NULL;
1488 }
1489
1490 static int ceph_netfs_check_write_begin(struct file *file, loff_t pos, unsigned int len,
1491                                         struct folio **foliop, void **_fsdata)
1492 {
1493         struct inode *inode = file_inode(file);
1494         struct ceph_inode_info *ci = ceph_inode(inode);
1495         struct ceph_snap_context *snapc;
1496
1497         snapc = ceph_find_incompatible(folio_page(*foliop, 0));
1498         if (snapc) {
1499                 int r;
1500
1501                 folio_unlock(*foliop);
1502                 folio_put(*foliop);
1503                 *foliop = NULL;
1504                 if (IS_ERR(snapc))
1505                         return PTR_ERR(snapc);
1506
1507                 ceph_queue_writeback(inode);
1508                 r = wait_event_killable(ci->i_cap_wq,
1509                                         context_is_writeable_or_written(inode, snapc));
1510                 ceph_put_snap_context(snapc);
1511                 return r == 0 ? -EAGAIN : r;
1512         }
1513         return 0;
1514 }
1515
1516 /*
1517  * We are only allowed to write into/dirty the page if the page is
1518  * clean, or already dirty within the same snap context.
1519  */
1520 static int ceph_write_begin(struct file *file, struct address_space *mapping,
1521                             loff_t pos, unsigned len,
1522                             struct page **pagep, void **fsdata)
1523 {
1524         struct inode *inode = file_inode(file);
1525         struct ceph_inode_info *ci = ceph_inode(inode);
1526         struct folio *folio = NULL;
1527         int r;
1528
1529         r = netfs_write_begin(&ci->netfs, file, inode->i_mapping, pos, len, &folio, NULL);
1530         if (r < 0)
1531                 return r;
1532
1533         folio_wait_fscache(folio);
1534         WARN_ON_ONCE(!folio_test_locked(folio));
1535         *pagep = &folio->page;
1536         return 0;
1537 }
1538
1539 /*
1540  * we don't do anything in here that simple_write_end doesn't do
1541  * except adjust dirty page accounting
1542  */
1543 static int ceph_write_end(struct file *file, struct address_space *mapping,
1544                           loff_t pos, unsigned len, unsigned copied,
1545                           struct page *subpage, void *fsdata)
1546 {
1547         struct folio *folio = page_folio(subpage);
1548         struct inode *inode = file_inode(file);
1549         struct ceph_client *cl = ceph_inode_to_client(inode);
1550         bool check_cap = false;
1551
1552         doutc(cl, "%llx.%llx file %p folio %p %d~%d (%d)\n", ceph_vinop(inode),
1553               file, folio, (int)pos, (int)copied, (int)len);
1554
1555         if (!folio_test_uptodate(folio)) {
1556                 /* just return that nothing was copied on a short copy */
1557                 if (copied < len) {
1558                         copied = 0;
1559                         goto out;
1560                 }
1561                 folio_mark_uptodate(folio);
1562         }
1563
1564         /* did file size increase? */
1565         if (pos+copied > i_size_read(inode))
1566                 check_cap = ceph_inode_set_size(inode, pos+copied);
1567
1568         folio_mark_dirty(folio);
1569
1570 out:
1571         folio_unlock(folio);
1572         folio_put(folio);
1573
1574         if (check_cap)
1575                 ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY);
1576
1577         return copied;
1578 }
1579
1580 const struct address_space_operations ceph_aops = {
1581         .read_folio = netfs_read_folio,
1582         .readahead = netfs_readahead,
1583         .writepage = ceph_writepage,
1584         .writepages = ceph_writepages_start,
1585         .write_begin = ceph_write_begin,
1586         .write_end = ceph_write_end,
1587         .dirty_folio = ceph_dirty_folio,
1588         .invalidate_folio = ceph_invalidate_folio,
1589         .release_folio = ceph_release_folio,
1590         .direct_IO = noop_direct_IO,
1591 };
1592
1593 static void ceph_block_sigs(sigset_t *oldset)
1594 {
1595         sigset_t mask;
1596         siginitsetinv(&mask, sigmask(SIGKILL));
1597         sigprocmask(SIG_BLOCK, &mask, oldset);
1598 }
1599
1600 static void ceph_restore_sigs(sigset_t *oldset)
1601 {
1602         sigprocmask(SIG_SETMASK, oldset, NULL);
1603 }
1604
1605 /*
1606  * vm ops
1607  */
1608 static vm_fault_t ceph_filemap_fault(struct vm_fault *vmf)
1609 {
1610         struct vm_area_struct *vma = vmf->vma;
1611         struct inode *inode = file_inode(vma->vm_file);
1612         struct ceph_inode_info *ci = ceph_inode(inode);
1613         struct ceph_client *cl = ceph_inode_to_client(inode);
1614         struct ceph_file_info *fi = vma->vm_file->private_data;
1615         loff_t off = (loff_t)vmf->pgoff << PAGE_SHIFT;
1616         int want, got, err;
1617         sigset_t oldset;
1618         vm_fault_t ret = VM_FAULT_SIGBUS;
1619
1620         if (ceph_inode_is_shutdown(inode))
1621                 return ret;
1622
1623         ceph_block_sigs(&oldset);
1624
1625         doutc(cl, "%llx.%llx %llu trying to get caps\n",
1626               ceph_vinop(inode), off);
1627         if (fi->fmode & CEPH_FILE_MODE_LAZY)
1628                 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
1629         else
1630                 want = CEPH_CAP_FILE_CACHE;
1631
1632         got = 0;
1633         err = ceph_get_caps(vma->vm_file, CEPH_CAP_FILE_RD, want, -1, &got);
1634         if (err < 0)
1635                 goto out_restore;
1636
1637         doutc(cl, "%llx.%llx %llu got cap refs on %s\n", ceph_vinop(inode),
1638               off, ceph_cap_string(got));
1639
1640         if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) ||
1641             !ceph_has_inline_data(ci)) {
1642                 CEPH_DEFINE_RW_CONTEXT(rw_ctx, got);
1643                 ceph_add_rw_context(fi, &rw_ctx);
1644                 ret = filemap_fault(vmf);
1645                 ceph_del_rw_context(fi, &rw_ctx);
1646                 doutc(cl, "%llx.%llx %llu drop cap refs %s ret %x\n",
1647                       ceph_vinop(inode), off, ceph_cap_string(got), ret);
1648         } else
1649                 err = -EAGAIN;
1650
1651         ceph_put_cap_refs(ci, got);
1652
1653         if (err != -EAGAIN)
1654                 goto out_restore;
1655
1656         /* read inline data */
1657         if (off >= PAGE_SIZE) {
1658                 /* does not support inline data > PAGE_SIZE */
1659                 ret = VM_FAULT_SIGBUS;
1660         } else {
1661                 struct address_space *mapping = inode->i_mapping;
1662                 struct page *page;
1663
1664                 filemap_invalidate_lock_shared(mapping);
1665                 page = find_or_create_page(mapping, 0,
1666                                 mapping_gfp_constraint(mapping, ~__GFP_FS));
1667                 if (!page) {
1668                         ret = VM_FAULT_OOM;
1669                         goto out_inline;
1670                 }
1671                 err = __ceph_do_getattr(inode, page,
1672                                          CEPH_STAT_CAP_INLINE_DATA, true);
1673                 if (err < 0 || off >= i_size_read(inode)) {
1674                         unlock_page(page);
1675                         put_page(page);
1676                         ret = vmf_error(err);
1677                         goto out_inline;
1678                 }
1679                 if (err < PAGE_SIZE)
1680                         zero_user_segment(page, err, PAGE_SIZE);
1681                 else
1682                         flush_dcache_page(page);
1683                 SetPageUptodate(page);
1684                 vmf->page = page;
1685                 ret = VM_FAULT_MAJOR | VM_FAULT_LOCKED;
1686 out_inline:
1687                 filemap_invalidate_unlock_shared(mapping);
1688                 doutc(cl, "%llx.%llx %llu read inline data ret %x\n",
1689                       ceph_vinop(inode), off, ret);
1690         }
1691 out_restore:
1692         ceph_restore_sigs(&oldset);
1693         if (err < 0)
1694                 ret = vmf_error(err);
1695
1696         return ret;
1697 }
1698
1699 static vm_fault_t ceph_page_mkwrite(struct vm_fault *vmf)
1700 {
1701         struct vm_area_struct *vma = vmf->vma;
1702         struct inode *inode = file_inode(vma->vm_file);
1703         struct ceph_client *cl = ceph_inode_to_client(inode);
1704         struct ceph_inode_info *ci = ceph_inode(inode);
1705         struct ceph_file_info *fi = vma->vm_file->private_data;
1706         struct ceph_cap_flush *prealloc_cf;
1707         struct page *page = vmf->page;
1708         loff_t off = page_offset(page);
1709         loff_t size = i_size_read(inode);
1710         size_t len;
1711         int want, got, err;
1712         sigset_t oldset;
1713         vm_fault_t ret = VM_FAULT_SIGBUS;
1714
1715         if (ceph_inode_is_shutdown(inode))
1716                 return ret;
1717
1718         prealloc_cf = ceph_alloc_cap_flush();
1719         if (!prealloc_cf)
1720                 return VM_FAULT_OOM;
1721
1722         sb_start_pagefault(inode->i_sb);
1723         ceph_block_sigs(&oldset);
1724
1725         if (off + thp_size(page) <= size)
1726                 len = thp_size(page);
1727         else
1728                 len = offset_in_thp(page, size);
1729
1730         doutc(cl, "%llx.%llx %llu~%zd getting caps i_size %llu\n",
1731               ceph_vinop(inode), off, len, size);
1732         if (fi->fmode & CEPH_FILE_MODE_LAZY)
1733                 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
1734         else
1735                 want = CEPH_CAP_FILE_BUFFER;
1736
1737         got = 0;
1738         err = ceph_get_caps(vma->vm_file, CEPH_CAP_FILE_WR, want, off + len, &got);
1739         if (err < 0)
1740                 goto out_free;
1741
1742         doutc(cl, "%llx.%llx %llu~%zd got cap refs on %s\n", ceph_vinop(inode),
1743               off, len, ceph_cap_string(got));
1744
1745         /* Update time before taking page lock */
1746         file_update_time(vma->vm_file);
1747         inode_inc_iversion_raw(inode);
1748
1749         do {
1750                 struct ceph_snap_context *snapc;
1751
1752                 lock_page(page);
1753
1754                 if (page_mkwrite_check_truncate(page, inode) < 0) {
1755                         unlock_page(page);
1756                         ret = VM_FAULT_NOPAGE;
1757                         break;
1758                 }
1759
1760                 snapc = ceph_find_incompatible(page);
1761                 if (!snapc) {
1762                         /* success.  we'll keep the page locked. */
1763                         set_page_dirty(page);
1764                         ret = VM_FAULT_LOCKED;
1765                         break;
1766                 }
1767
1768                 unlock_page(page);
1769
1770                 if (IS_ERR(snapc)) {
1771                         ret = VM_FAULT_SIGBUS;
1772                         break;
1773                 }
1774
1775                 ceph_queue_writeback(inode);
1776                 err = wait_event_killable(ci->i_cap_wq,
1777                                 context_is_writeable_or_written(inode, snapc));
1778                 ceph_put_snap_context(snapc);
1779         } while (err == 0);
1780
1781         if (ret == VM_FAULT_LOCKED) {
1782                 int dirty;
1783                 spin_lock(&ci->i_ceph_lock);
1784                 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1785                                                &prealloc_cf);
1786                 spin_unlock(&ci->i_ceph_lock);
1787                 if (dirty)
1788                         __mark_inode_dirty(inode, dirty);
1789         }
1790
1791         doutc(cl, "%llx.%llx %llu~%zd dropping cap refs on %s ret %x\n",
1792               ceph_vinop(inode), off, len, ceph_cap_string(got), ret);
1793         ceph_put_cap_refs_async(ci, got);
1794 out_free:
1795         ceph_restore_sigs(&oldset);
1796         sb_end_pagefault(inode->i_sb);
1797         ceph_free_cap_flush(prealloc_cf);
1798         if (err < 0)
1799                 ret = vmf_error(err);
1800         return ret;
1801 }
1802
1803 void ceph_fill_inline_data(struct inode *inode, struct page *locked_page,
1804                            char *data, size_t len)
1805 {
1806         struct ceph_client *cl = ceph_inode_to_client(inode);
1807         struct address_space *mapping = inode->i_mapping;
1808         struct page *page;
1809
1810         if (locked_page) {
1811                 page = locked_page;
1812         } else {
1813                 if (i_size_read(inode) == 0)
1814                         return;
1815                 page = find_or_create_page(mapping, 0,
1816                                            mapping_gfp_constraint(mapping,
1817                                            ~__GFP_FS));
1818                 if (!page)
1819                         return;
1820                 if (PageUptodate(page)) {
1821                         unlock_page(page);
1822                         put_page(page);
1823                         return;
1824                 }
1825         }
1826
1827         doutc(cl, "%p %llx.%llx len %zu locked_page %p\n", inode,
1828               ceph_vinop(inode), len, locked_page);
1829
1830         if (len > 0) {
1831                 void *kaddr = kmap_atomic(page);
1832                 memcpy(kaddr, data, len);
1833                 kunmap_atomic(kaddr);
1834         }
1835
1836         if (page != locked_page) {
1837                 if (len < PAGE_SIZE)
1838                         zero_user_segment(page, len, PAGE_SIZE);
1839                 else
1840                         flush_dcache_page(page);
1841
1842                 SetPageUptodate(page);
1843                 unlock_page(page);
1844                 put_page(page);
1845         }
1846 }
1847
1848 int ceph_uninline_data(struct file *file)
1849 {
1850         struct inode *inode = file_inode(file);
1851         struct ceph_inode_info *ci = ceph_inode(inode);
1852         struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
1853         struct ceph_client *cl = fsc->client;
1854         struct ceph_osd_request *req = NULL;
1855         struct ceph_cap_flush *prealloc_cf = NULL;
1856         struct folio *folio = NULL;
1857         u64 inline_version = CEPH_INLINE_NONE;
1858         struct page *pages[1];
1859         int err = 0;
1860         u64 len;
1861
1862         spin_lock(&ci->i_ceph_lock);
1863         inline_version = ci->i_inline_version;
1864         spin_unlock(&ci->i_ceph_lock);
1865
1866         doutc(cl, "%llx.%llx inline_version %llu\n", ceph_vinop(inode),
1867               inline_version);
1868
1869         if (ceph_inode_is_shutdown(inode)) {
1870                 err = -EIO;
1871                 goto out;
1872         }
1873
1874         if (inline_version == CEPH_INLINE_NONE)
1875                 return 0;
1876
1877         prealloc_cf = ceph_alloc_cap_flush();
1878         if (!prealloc_cf)
1879                 return -ENOMEM;
1880
1881         if (inline_version == 1) /* initial version, no data */
1882                 goto out_uninline;
1883
1884         folio = read_mapping_folio(inode->i_mapping, 0, file);
1885         if (IS_ERR(folio)) {
1886                 err = PTR_ERR(folio);
1887                 goto out;
1888         }
1889
1890         folio_lock(folio);
1891
1892         len = i_size_read(inode);
1893         if (len > folio_size(folio))
1894                 len = folio_size(folio);
1895
1896         req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1897                                     ceph_vino(inode), 0, &len, 0, 1,
1898                                     CEPH_OSD_OP_CREATE, CEPH_OSD_FLAG_WRITE,
1899                                     NULL, 0, 0, false);
1900         if (IS_ERR(req)) {
1901                 err = PTR_ERR(req);
1902                 goto out_unlock;
1903         }
1904
1905         req->r_mtime = inode_get_mtime(inode);
1906         ceph_osdc_start_request(&fsc->client->osdc, req);
1907         err = ceph_osdc_wait_request(&fsc->client->osdc, req);
1908         ceph_osdc_put_request(req);
1909         if (err < 0)
1910                 goto out_unlock;
1911
1912         req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1913                                     ceph_vino(inode), 0, &len, 1, 3,
1914                                     CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE,
1915                                     NULL, ci->i_truncate_seq,
1916                                     ci->i_truncate_size, false);
1917         if (IS_ERR(req)) {
1918                 err = PTR_ERR(req);
1919                 goto out_unlock;
1920         }
1921
1922         pages[0] = folio_page(folio, 0);
1923         osd_req_op_extent_osd_data_pages(req, 1, pages, len, 0, false, false);
1924
1925         {
1926                 __le64 xattr_buf = cpu_to_le64(inline_version);
1927                 err = osd_req_op_xattr_init(req, 0, CEPH_OSD_OP_CMPXATTR,
1928                                             "inline_version", &xattr_buf,
1929                                             sizeof(xattr_buf),
1930                                             CEPH_OSD_CMPXATTR_OP_GT,
1931                                             CEPH_OSD_CMPXATTR_MODE_U64);
1932                 if (err)
1933                         goto out_put_req;
1934         }
1935
1936         {
1937                 char xattr_buf[32];
1938                 int xattr_len = snprintf(xattr_buf, sizeof(xattr_buf),
1939                                          "%llu", inline_version);
1940                 err = osd_req_op_xattr_init(req, 2, CEPH_OSD_OP_SETXATTR,
1941                                             "inline_version",
1942                                             xattr_buf, xattr_len, 0, 0);
1943                 if (err)
1944                         goto out_put_req;
1945         }
1946
1947         req->r_mtime = inode_get_mtime(inode);
1948         ceph_osdc_start_request(&fsc->client->osdc, req);
1949         err = ceph_osdc_wait_request(&fsc->client->osdc, req);
1950
1951         ceph_update_write_metrics(&fsc->mdsc->metric, req->r_start_latency,
1952                                   req->r_end_latency, len, err);
1953
1954 out_uninline:
1955         if (!err) {
1956                 int dirty;
1957
1958                 /* Set to CAP_INLINE_NONE and dirty the caps */
1959                 down_read(&fsc->mdsc->snap_rwsem);
1960                 spin_lock(&ci->i_ceph_lock);
1961                 ci->i_inline_version = CEPH_INLINE_NONE;
1962                 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR, &prealloc_cf);
1963                 spin_unlock(&ci->i_ceph_lock);
1964                 up_read(&fsc->mdsc->snap_rwsem);
1965                 if (dirty)
1966                         __mark_inode_dirty(inode, dirty);
1967         }
1968 out_put_req:
1969         ceph_osdc_put_request(req);
1970         if (err == -ECANCELED)
1971                 err = 0;
1972 out_unlock:
1973         if (folio) {
1974                 folio_unlock(folio);
1975                 folio_put(folio);
1976         }
1977 out:
1978         ceph_free_cap_flush(prealloc_cf);
1979         doutc(cl, "%llx.%llx inline_version %llu = %d\n",
1980               ceph_vinop(inode), inline_version, err);
1981         return err;
1982 }
1983
1984 static const struct vm_operations_struct ceph_vmops = {
1985         .fault          = ceph_filemap_fault,
1986         .page_mkwrite   = ceph_page_mkwrite,
1987 };
1988
1989 int ceph_mmap(struct file *file, struct vm_area_struct *vma)
1990 {
1991         struct address_space *mapping = file->f_mapping;
1992
1993         if (!mapping->a_ops->read_folio)
1994                 return -ENOEXEC;
1995         vma->vm_ops = &ceph_vmops;
1996         return 0;
1997 }
1998
1999 enum {
2000         POOL_READ       = 1,
2001         POOL_WRITE      = 2,
2002 };
2003
2004 static int __ceph_pool_perm_get(struct ceph_inode_info *ci,
2005                                 s64 pool, struct ceph_string *pool_ns)
2006 {
2007         struct ceph_fs_client *fsc = ceph_inode_to_fs_client(&ci->netfs.inode);
2008         struct ceph_mds_client *mdsc = fsc->mdsc;
2009         struct ceph_client *cl = fsc->client;
2010         struct ceph_osd_request *rd_req = NULL, *wr_req = NULL;
2011         struct rb_node **p, *parent;
2012         struct ceph_pool_perm *perm;
2013         struct page **pages;
2014         size_t pool_ns_len;
2015         int err = 0, err2 = 0, have = 0;
2016
2017         down_read(&mdsc->pool_perm_rwsem);
2018         p = &mdsc->pool_perm_tree.rb_node;
2019         while (*p) {
2020                 perm = rb_entry(*p, struct ceph_pool_perm, node);
2021                 if (pool < perm->pool)
2022                         p = &(*p)->rb_left;
2023                 else if (pool > perm->pool)
2024                         p = &(*p)->rb_right;
2025                 else {
2026                         int ret = ceph_compare_string(pool_ns,
2027                                                 perm->pool_ns,
2028                                                 perm->pool_ns_len);
2029                         if (ret < 0)
2030                                 p = &(*p)->rb_left;
2031                         else if (ret > 0)
2032                                 p = &(*p)->rb_right;
2033                         else {
2034                                 have = perm->perm;
2035                                 break;
2036                         }
2037                 }
2038         }
2039         up_read(&mdsc->pool_perm_rwsem);
2040         if (*p)
2041                 goto out;
2042
2043         if (pool_ns)
2044                 doutc(cl, "pool %lld ns %.*s no perm cached\n", pool,
2045                       (int)pool_ns->len, pool_ns->str);
2046         else
2047                 doutc(cl, "pool %lld no perm cached\n", pool);
2048
2049         down_write(&mdsc->pool_perm_rwsem);
2050         p = &mdsc->pool_perm_tree.rb_node;
2051         parent = NULL;
2052         while (*p) {
2053                 parent = *p;
2054                 perm = rb_entry(parent, struct ceph_pool_perm, node);
2055                 if (pool < perm->pool)
2056                         p = &(*p)->rb_left;
2057                 else if (pool > perm->pool)
2058                         p = &(*p)->rb_right;
2059                 else {
2060                         int ret = ceph_compare_string(pool_ns,
2061                                                 perm->pool_ns,
2062                                                 perm->pool_ns_len);
2063                         if (ret < 0)
2064                                 p = &(*p)->rb_left;
2065                         else if (ret > 0)
2066                                 p = &(*p)->rb_right;
2067                         else {
2068                                 have = perm->perm;
2069                                 break;
2070                         }
2071                 }
2072         }
2073         if (*p) {
2074                 up_write(&mdsc->pool_perm_rwsem);
2075                 goto out;
2076         }
2077
2078         rd_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL,
2079                                          1, false, GFP_NOFS);
2080         if (!rd_req) {
2081                 err = -ENOMEM;
2082                 goto out_unlock;
2083         }
2084
2085         rd_req->r_flags = CEPH_OSD_FLAG_READ;
2086         osd_req_op_init(rd_req, 0, CEPH_OSD_OP_STAT, 0);
2087         rd_req->r_base_oloc.pool = pool;
2088         if (pool_ns)
2089                 rd_req->r_base_oloc.pool_ns = ceph_get_string(pool_ns);
2090         ceph_oid_printf(&rd_req->r_base_oid, "%llx.00000000", ci->i_vino.ino);
2091
2092         err = ceph_osdc_alloc_messages(rd_req, GFP_NOFS);
2093         if (err)
2094                 goto out_unlock;
2095
2096         wr_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL,
2097                                          1, false, GFP_NOFS);
2098         if (!wr_req) {
2099                 err = -ENOMEM;
2100                 goto out_unlock;
2101         }
2102
2103         wr_req->r_flags = CEPH_OSD_FLAG_WRITE;
2104         osd_req_op_init(wr_req, 0, CEPH_OSD_OP_CREATE, CEPH_OSD_OP_FLAG_EXCL);
2105         ceph_oloc_copy(&wr_req->r_base_oloc, &rd_req->r_base_oloc);
2106         ceph_oid_copy(&wr_req->r_base_oid, &rd_req->r_base_oid);
2107
2108         err = ceph_osdc_alloc_messages(wr_req, GFP_NOFS);
2109         if (err)
2110                 goto out_unlock;
2111
2112         /* one page should be large enough for STAT data */
2113         pages = ceph_alloc_page_vector(1, GFP_KERNEL);
2114         if (IS_ERR(pages)) {
2115                 err = PTR_ERR(pages);
2116                 goto out_unlock;
2117         }
2118
2119         osd_req_op_raw_data_in_pages(rd_req, 0, pages, PAGE_SIZE,
2120                                      0, false, true);
2121         ceph_osdc_start_request(&fsc->client->osdc, rd_req);
2122
2123         wr_req->r_mtime = inode_get_mtime(&ci->netfs.inode);
2124         ceph_osdc_start_request(&fsc->client->osdc, wr_req);
2125
2126         err = ceph_osdc_wait_request(&fsc->client->osdc, rd_req);
2127         err2 = ceph_osdc_wait_request(&fsc->client->osdc, wr_req);
2128
2129         if (err >= 0 || err == -ENOENT)
2130                 have |= POOL_READ;
2131         else if (err != -EPERM) {
2132                 if (err == -EBLOCKLISTED)
2133                         fsc->blocklisted = true;
2134                 goto out_unlock;
2135         }
2136
2137         if (err2 == 0 || err2 == -EEXIST)
2138                 have |= POOL_WRITE;
2139         else if (err2 != -EPERM) {
2140                 if (err2 == -EBLOCKLISTED)
2141                         fsc->blocklisted = true;
2142                 err = err2;
2143                 goto out_unlock;
2144         }
2145
2146         pool_ns_len = pool_ns ? pool_ns->len : 0;
2147         perm = kmalloc(sizeof(*perm) + pool_ns_len + 1, GFP_NOFS);
2148         if (!perm) {
2149                 err = -ENOMEM;
2150                 goto out_unlock;
2151         }
2152
2153         perm->pool = pool;
2154         perm->perm = have;
2155         perm->pool_ns_len = pool_ns_len;
2156         if (pool_ns_len > 0)
2157                 memcpy(perm->pool_ns, pool_ns->str, pool_ns_len);
2158         perm->pool_ns[pool_ns_len] = 0;
2159
2160         rb_link_node(&perm->node, parent, p);
2161         rb_insert_color(&perm->node, &mdsc->pool_perm_tree);
2162         err = 0;
2163 out_unlock:
2164         up_write(&mdsc->pool_perm_rwsem);
2165
2166         ceph_osdc_put_request(rd_req);
2167         ceph_osdc_put_request(wr_req);
2168 out:
2169         if (!err)
2170                 err = have;
2171         if (pool_ns)
2172                 doutc(cl, "pool %lld ns %.*s result = %d\n", pool,
2173                       (int)pool_ns->len, pool_ns->str, err);
2174         else
2175                 doutc(cl, "pool %lld result = %d\n", pool, err);
2176         return err;
2177 }
2178
2179 int ceph_pool_perm_check(struct inode *inode, int need)
2180 {
2181         struct ceph_client *cl = ceph_inode_to_client(inode);
2182         struct ceph_inode_info *ci = ceph_inode(inode);
2183         struct ceph_string *pool_ns;
2184         s64 pool;
2185         int ret, flags;
2186
2187         /* Only need to do this for regular files */
2188         if (!S_ISREG(inode->i_mode))
2189                 return 0;
2190
2191         if (ci->i_vino.snap != CEPH_NOSNAP) {
2192                 /*
2193                  * Pool permission check needs to write to the first object.
2194                  * But for snapshot, head of the first object may have alread
2195                  * been deleted. Skip check to avoid creating orphan object.
2196                  */
2197                 return 0;
2198         }
2199
2200         if (ceph_test_mount_opt(ceph_inode_to_fs_client(inode),
2201                                 NOPOOLPERM))
2202                 return 0;
2203
2204         spin_lock(&ci->i_ceph_lock);
2205         flags = ci->i_ceph_flags;
2206         pool = ci->i_layout.pool_id;
2207         spin_unlock(&ci->i_ceph_lock);
2208 check:
2209         if (flags & CEPH_I_POOL_PERM) {
2210                 if ((need & CEPH_CAP_FILE_RD) && !(flags & CEPH_I_POOL_RD)) {
2211                         doutc(cl, "pool %lld no read perm\n", pool);
2212                         return -EPERM;
2213                 }
2214                 if ((need & CEPH_CAP_FILE_WR) && !(flags & CEPH_I_POOL_WR)) {
2215                         doutc(cl, "pool %lld no write perm\n", pool);
2216                         return -EPERM;
2217                 }
2218                 return 0;
2219         }
2220
2221         pool_ns = ceph_try_get_string(ci->i_layout.pool_ns);
2222         ret = __ceph_pool_perm_get(ci, pool, pool_ns);
2223         ceph_put_string(pool_ns);
2224         if (ret < 0)
2225                 return ret;
2226
2227         flags = CEPH_I_POOL_PERM;
2228         if (ret & POOL_READ)
2229                 flags |= CEPH_I_POOL_RD;
2230         if (ret & POOL_WRITE)
2231                 flags |= CEPH_I_POOL_WR;
2232
2233         spin_lock(&ci->i_ceph_lock);
2234         if (pool == ci->i_layout.pool_id &&
2235             pool_ns == rcu_dereference_raw(ci->i_layout.pool_ns)) {
2236                 ci->i_ceph_flags |= flags;
2237         } else {
2238                 pool = ci->i_layout.pool_id;
2239                 flags = ci->i_ceph_flags;
2240         }
2241         spin_unlock(&ci->i_ceph_lock);
2242         goto check;
2243 }
2244
2245 void ceph_pool_perm_destroy(struct ceph_mds_client *mdsc)
2246 {
2247         struct ceph_pool_perm *perm;
2248         struct rb_node *n;
2249
2250         while (!RB_EMPTY_ROOT(&mdsc->pool_perm_tree)) {
2251                 n = rb_first(&mdsc->pool_perm_tree);
2252                 perm = rb_entry(n, struct ceph_pool_perm, node);
2253                 rb_erase(n, &mdsc->pool_perm_tree);
2254                 kfree(perm);
2255         }
2256 }