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1// SPDX-License-Identifier: GPL-2.02#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#include <trace/events/netfs.h>17 18#include "super.h"19#include "mds_client.h"20#include "cache.h"21#include "metric.h"22#include "crypto.h"23#include <linux/ceph/osd_client.h>24#include <linux/ceph/striper.h>25 26/*27 * Ceph address space ops.28 *29 * There are a few funny things going on here.30 *31 * The page->private field is used to reference a struct32 * ceph_snap_context for _every_ dirty page. This indicates which33 * snapshot the page was logically dirtied in, and thus which snap34 * context needs to be associated with the osd write during writeback.35 *36 * Similarly, struct ceph_inode_info maintains a set of counters to37 * count dirty pages on the inode. In the absence of snapshots,38 * i_wrbuffer_ref == i_wrbuffer_ref_head == the dirty page count.39 *40 * When a snapshot is taken (that is, when the client receives41 * notification that a snapshot was taken), each inode with caps and42 * with dirty pages (dirty pages implies there is a cap) gets a new43 * ceph_cap_snap in the i_cap_snaps list (which is sorted in ascending44 * order, new snaps go to the tail). The i_wrbuffer_ref_head count is45 * moved to capsnap->dirty. (Unless a sync write is currently in46 * progress. In that case, the capsnap is said to be "pending", new47 * writes cannot start, and the capsnap isn't "finalized" until the48 * write completes (or fails) and a final size/mtime for the inode for49 * that snap can be settled upon.) i_wrbuffer_ref_head is reset to 0.50 *51 * On writeback, we must submit writes to the osd IN SNAP ORDER. So,52 * we look for the first capsnap in i_cap_snaps and write out pages in53 * that snap context _only_. Then we move on to the next capsnap,54 * eventually reaching the "live" or "head" context (i.e., pages that55 * are not yet snapped) and are writing the most recently dirtied56 * pages.57 *58 * Invalidate and so forth must take care to ensure the dirty page59 * accounting is preserved.60 */61 62#define CONGESTION_ON_THRESH(congestion_kb) (congestion_kb >> (PAGE_SHIFT-10))63#define CONGESTION_OFF_THRESH(congestion_kb) \64 (CONGESTION_ON_THRESH(congestion_kb) - \65 (CONGESTION_ON_THRESH(congestion_kb) >> 2))66 67static int ceph_netfs_check_write_begin(struct file *file, loff_t pos, unsigned int len,68 struct folio **foliop, void **_fsdata);69 70static inline struct ceph_snap_context *page_snap_context(struct page *page)71{72 if (PagePrivate(page))73 return (void *)page->private;74 return NULL;75}76 77/*78 * Dirty a page. Optimistically adjust accounting, on the assumption79 * that we won't race with invalidate. If we do, readjust.80 */81static bool ceph_dirty_folio(struct address_space *mapping, struct folio *folio)82{83 struct inode *inode = mapping->host;84 struct ceph_client *cl = ceph_inode_to_client(inode);85 struct ceph_inode_info *ci;86 struct ceph_snap_context *snapc;87 88 if (folio_test_dirty(folio)) {89 doutc(cl, "%llx.%llx %p idx %lu -- already dirty\n",90 ceph_vinop(inode), folio, folio->index);91 VM_BUG_ON_FOLIO(!folio_test_private(folio), folio);92 return false;93 }94 95 ci = ceph_inode(inode);96 97 /* dirty the head */98 spin_lock(&ci->i_ceph_lock);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 set124 * 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 the134 * dirty folio counters appropriately. Only called if there is private135 * data on the folio.136 */137static 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 netfs_invalidate_folio(folio, offset, length);163}164 165static void ceph_netfs_expand_readahead(struct netfs_io_request *rreq)166{167 struct inode *inode = rreq->inode;168 struct ceph_inode_info *ci = ceph_inode(inode);169 struct ceph_file_layout *lo = &ci->i_layout;170 unsigned long max_pages = inode->i_sb->s_bdi->ra_pages;171 loff_t end = rreq->start + rreq->len, new_end;172 struct ceph_netfs_request_data *priv = rreq->netfs_priv;173 unsigned long max_len;174 u32 blockoff;175 176 if (priv) {177 /* Readahead is disabled by posix_fadvise POSIX_FADV_RANDOM */178 if (priv->file_ra_disabled)179 max_pages = 0;180 else181 max_pages = priv->file_ra_pages;182 183 }184 185 /* Readahead is disabled */186 if (!max_pages)187 return;188 189 max_len = max_pages << PAGE_SHIFT;190 191 /*192 * Try to expand the length forward by rounding up it to the next193 * block, but do not exceed the file size, unless the original194 * request already exceeds it.195 */196 new_end = umin(round_up(end, lo->stripe_unit), rreq->i_size);197 if (new_end > end && new_end <= rreq->start + max_len)198 rreq->len = new_end - rreq->start;199 200 /* Try to expand the start downward */201 div_u64_rem(rreq->start, lo->stripe_unit, &blockoff);202 if (rreq->len + blockoff <= max_len) {203 rreq->start -= blockoff;204 rreq->len += blockoff;205 }206}207 208static void finish_netfs_read(struct ceph_osd_request *req)209{210 struct inode *inode = req->r_inode;211 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);212 struct ceph_client *cl = fsc->client;213 struct ceph_osd_data *osd_data = osd_req_op_extent_osd_data(req, 0);214 struct netfs_io_subrequest *subreq = req->r_priv;215 struct ceph_osd_req_op *op = &req->r_ops[0];216 int err = req->r_result;217 bool sparse = (op->op == CEPH_OSD_OP_SPARSE_READ);218 219 ceph_update_read_metrics(&fsc->mdsc->metric, req->r_start_latency,220 req->r_end_latency, osd_data->length, err);221 222 doutc(cl, "result %d subreq->len=%zu i_size=%lld\n", req->r_result,223 subreq->len, i_size_read(req->r_inode));224 225 /* no object means success but no data */226 if (err == -ENOENT)227 err = 0;228 else if (err == -EBLOCKLISTED)229 fsc->blocklisted = true;230 231 if (err >= 0) {232 if (sparse && err > 0)233 err = ceph_sparse_ext_map_end(op);234 if (err < subreq->len &&235 subreq->rreq->origin != NETFS_DIO_READ)236 __set_bit(NETFS_SREQ_CLEAR_TAIL, &subreq->flags);237 if (IS_ENCRYPTED(inode) && err > 0) {238 err = ceph_fscrypt_decrypt_extents(inode,239 osd_data->pages, subreq->start,240 op->extent.sparse_ext,241 op->extent.sparse_ext_cnt);242 if (err > subreq->len)243 err = subreq->len;244 }245 }246 247 if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {248 ceph_put_page_vector(osd_data->pages,249 calc_pages_for(osd_data->alignment,250 osd_data->length), false);251 }252 if (err > 0) {253 subreq->transferred = err;254 err = 0;255 }256 trace_netfs_sreq(subreq, netfs_sreq_trace_io_progress);257 netfs_read_subreq_terminated(subreq, err, false);258 iput(req->r_inode);259 ceph_dec_osd_stopping_blocker(fsc->mdsc);260}261 262static bool ceph_netfs_issue_op_inline(struct netfs_io_subrequest *subreq)263{264 struct netfs_io_request *rreq = subreq->rreq;265 struct inode *inode = rreq->inode;266 struct ceph_mds_reply_info_parsed *rinfo;267 struct ceph_mds_reply_info_in *iinfo;268 struct ceph_mds_request *req;269 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);270 struct ceph_inode_info *ci = ceph_inode(inode);271 ssize_t err = 0;272 size_t len;273 int mode;274 275 if (rreq->origin != NETFS_DIO_READ)276 __set_bit(NETFS_SREQ_CLEAR_TAIL, &subreq->flags);277 __clear_bit(NETFS_SREQ_COPY_TO_CACHE, &subreq->flags);278 279 if (subreq->start >= inode->i_size)280 goto out;281 282 /* We need to fetch the inline data. */283 mode = ceph_try_to_choose_auth_mds(inode, CEPH_STAT_CAP_INLINE_DATA);284 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, mode);285 if (IS_ERR(req)) {286 err = PTR_ERR(req);287 goto out;288 }289 req->r_ino1 = ci->i_vino;290 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INLINE_DATA);291 req->r_num_caps = 2;292 293 trace_netfs_sreq(subreq, netfs_sreq_trace_submit);294 err = ceph_mdsc_do_request(mdsc, NULL, req);295 if (err < 0)296 goto out;297 298 rinfo = &req->r_reply_info;299 iinfo = &rinfo->targeti;300 if (iinfo->inline_version == CEPH_INLINE_NONE) {301 /* The data got uninlined */302 ceph_mdsc_put_request(req);303 return false;304 }305 306 len = min_t(size_t, iinfo->inline_len - subreq->start, subreq->len);307 err = copy_to_iter(iinfo->inline_data + subreq->start, len, &subreq->io_iter);308 if (err == 0) {309 err = -EFAULT;310 } else {311 subreq->transferred += err;312 err = 0;313 }314 315 ceph_mdsc_put_request(req);316out:317 netfs_read_subreq_terminated(subreq, err, false);318 return true;319}320 321static int ceph_netfs_prepare_read(struct netfs_io_subrequest *subreq)322{323 struct netfs_io_request *rreq = subreq->rreq;324 struct inode *inode = rreq->inode;325 struct ceph_inode_info *ci = ceph_inode(inode);326 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);327 u64 objno, objoff;328 u32 xlen;329 330 /* Truncate the extent at the end of the current block */331 ceph_calc_file_object_mapping(&ci->i_layout, subreq->start, subreq->len,332 &objno, &objoff, &xlen);333 rreq->io_streams[0].sreq_max_len = umin(xlen, fsc->mount_options->rsize);334 return 0;335}336 337static void ceph_netfs_issue_read(struct netfs_io_subrequest *subreq)338{339 struct netfs_io_request *rreq = subreq->rreq;340 struct inode *inode = rreq->inode;341 struct ceph_inode_info *ci = ceph_inode(inode);342 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);343 struct ceph_client *cl = fsc->client;344 struct ceph_osd_request *req = NULL;345 struct ceph_vino vino = ceph_vino(inode);346 int err;347 u64 len;348 bool sparse = IS_ENCRYPTED(inode) || ceph_test_mount_opt(fsc, SPARSEREAD);349 u64 off = subreq->start;350 int extent_cnt;351 352 if (ceph_inode_is_shutdown(inode)) {353 err = -EIO;354 goto out;355 }356 357 if (ceph_has_inline_data(ci) && ceph_netfs_issue_op_inline(subreq))358 return;359 360 // TODO: This rounding here is slightly dodgy. It *should* work, for361 // now, as the cache only deals in blocks that are a multiple of362 // PAGE_SIZE and fscrypt blocks are at most PAGE_SIZE. What needs to363 // happen is for the fscrypt driving to be moved into netfslib and the364 // data in the cache also to be stored encrypted.365 len = subreq->len;366 ceph_fscrypt_adjust_off_and_len(inode, &off, &len);367 368 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, vino,369 off, &len, 0, 1, sparse ? CEPH_OSD_OP_SPARSE_READ : CEPH_OSD_OP_READ,370 CEPH_OSD_FLAG_READ, NULL, ci->i_truncate_seq,371 ci->i_truncate_size, false);372 if (IS_ERR(req)) {373 err = PTR_ERR(req);374 req = NULL;375 goto out;376 }377 378 if (sparse) {379 extent_cnt = __ceph_sparse_read_ext_count(inode, len);380 err = ceph_alloc_sparse_ext_map(&req->r_ops[0], extent_cnt);381 if (err)382 goto out;383 }384 385 doutc(cl, "%llx.%llx pos=%llu orig_len=%zu len=%llu\n",386 ceph_vinop(inode), subreq->start, subreq->len, len);387 388 /*389 * FIXME: For now, use CEPH_OSD_DATA_TYPE_PAGES instead of _ITER for390 * encrypted inodes. We'd need infrastructure that handles an iov_iter391 * instead of page arrays, and we don't have that as of yet. Once the392 * dust settles on the write helpers and encrypt/decrypt routines for393 * netfs, we should be able to rework this.394 */395 if (IS_ENCRYPTED(inode)) {396 struct page **pages;397 size_t page_off;398 399 err = iov_iter_get_pages_alloc2(&subreq->io_iter, &pages, len, &page_off);400 if (err < 0) {401 doutc(cl, "%llx.%llx failed to allocate pages, %d\n",402 ceph_vinop(inode), err);403 goto out;404 }405 406 /* should always give us a page-aligned read */407 WARN_ON_ONCE(page_off);408 len = err;409 err = 0;410 411 osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, false,412 false);413 } else {414 osd_req_op_extent_osd_iter(req, 0, &subreq->io_iter);415 }416 if (!ceph_inc_osd_stopping_blocker(fsc->mdsc)) {417 err = -EIO;418 goto out;419 }420 req->r_callback = finish_netfs_read;421 req->r_priv = subreq;422 req->r_inode = inode;423 ihold(inode);424 425 trace_netfs_sreq(subreq, netfs_sreq_trace_submit);426 ceph_osdc_start_request(req->r_osdc, req);427out:428 ceph_osdc_put_request(req);429 if (err)430 netfs_read_subreq_terminated(subreq, err, false);431 doutc(cl, "%llx.%llx result %d\n", ceph_vinop(inode), err);432}433 434static int ceph_init_request(struct netfs_io_request *rreq, struct file *file)435{436 struct inode *inode = rreq->inode;437 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);438 struct ceph_client *cl = ceph_inode_to_client(inode);439 int got = 0, want = CEPH_CAP_FILE_CACHE;440 struct ceph_netfs_request_data *priv;441 int ret = 0;442 443 /* [DEPRECATED] Use PG_private_2 to mark folio being written to the cache. */444 __set_bit(NETFS_RREQ_USE_PGPRIV2, &rreq->flags);445 446 if (rreq->origin != NETFS_READAHEAD)447 return 0;448 449 priv = kzalloc(sizeof(*priv), GFP_NOFS);450 if (!priv)451 return -ENOMEM;452 453 if (file) {454 struct ceph_rw_context *rw_ctx;455 struct ceph_file_info *fi = file->private_data;456 457 priv->file_ra_pages = file->f_ra.ra_pages;458 priv->file_ra_disabled = file->f_mode & FMODE_RANDOM;459 460 rw_ctx = ceph_find_rw_context(fi);461 if (rw_ctx) {462 rreq->netfs_priv = priv;463 return 0;464 }465 }466 467 /*468 * readahead callers do not necessarily hold Fcb caps469 * (e.g. fadvise, madvise).470 */471 ret = ceph_try_get_caps(inode, CEPH_CAP_FILE_RD, want, true, &got);472 if (ret < 0) {473 doutc(cl, "%llx.%llx, error getting cap\n", ceph_vinop(inode));474 goto out;475 }476 477 if (!(got & want)) {478 doutc(cl, "%llx.%llx, no cache cap\n", ceph_vinop(inode));479 ret = -EACCES;480 goto out;481 }482 if (ret == 0) {483 ret = -EACCES;484 goto out;485 }486 487 priv->caps = got;488 rreq->netfs_priv = priv;489 rreq->io_streams[0].sreq_max_len = fsc->mount_options->rsize;490 491out:492 if (ret < 0) {493 if (got)494 ceph_put_cap_refs(ceph_inode(inode), got);495 kfree(priv);496 }497 498 return ret;499}500 501static void ceph_netfs_free_request(struct netfs_io_request *rreq)502{503 struct ceph_netfs_request_data *priv = rreq->netfs_priv;504 505 if (!priv)506 return;507 508 if (priv->caps)509 ceph_put_cap_refs(ceph_inode(rreq->inode), priv->caps);510 kfree(priv);511 rreq->netfs_priv = NULL;512}513 514const struct netfs_request_ops ceph_netfs_ops = {515 .init_request = ceph_init_request,516 .free_request = ceph_netfs_free_request,517 .prepare_read = ceph_netfs_prepare_read,518 .issue_read = ceph_netfs_issue_read,519 .expand_readahead = ceph_netfs_expand_readahead,520 .check_write_begin = ceph_netfs_check_write_begin,521};522 523#ifdef CONFIG_CEPH_FSCACHE524static void ceph_set_page_fscache(struct page *page)525{526 folio_start_private_2(page_folio(page)); /* [DEPRECATED] */527}528 529static void ceph_fscache_write_terminated(void *priv, ssize_t error, bool was_async)530{531 struct inode *inode = priv;532 533 if (IS_ERR_VALUE(error) && error != -ENOBUFS)534 ceph_fscache_invalidate(inode, false);535}536 537static void ceph_fscache_write_to_cache(struct inode *inode, u64 off, u64 len, bool caching)538{539 struct ceph_inode_info *ci = ceph_inode(inode);540 struct fscache_cookie *cookie = ceph_fscache_cookie(ci);541 542 fscache_write_to_cache(cookie, inode->i_mapping, off, len, i_size_read(inode),543 ceph_fscache_write_terminated, inode, true, caching);544}545#else546static inline void ceph_set_page_fscache(struct page *page)547{548}549 550static inline void ceph_fscache_write_to_cache(struct inode *inode, u64 off, u64 len, bool caching)551{552}553#endif /* CONFIG_CEPH_FSCACHE */554 555struct ceph_writeback_ctl556{557 loff_t i_size;558 u64 truncate_size;559 u32 truncate_seq;560 bool size_stable;561 bool head_snapc;562};563 564/*565 * Get ref for the oldest snapc for an inode with dirty data... that is, the566 * only snap context we are allowed to write back.567 */568static struct ceph_snap_context *569get_oldest_context(struct inode *inode, struct ceph_writeback_ctl *ctl,570 struct ceph_snap_context *page_snapc)571{572 struct ceph_inode_info *ci = ceph_inode(inode);573 struct ceph_client *cl = ceph_inode_to_client(inode);574 struct ceph_snap_context *snapc = NULL;575 struct ceph_cap_snap *capsnap = NULL;576 577 spin_lock(&ci->i_ceph_lock);578 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {579 doutc(cl, " capsnap %p snapc %p has %d dirty pages\n",580 capsnap, capsnap->context, capsnap->dirty_pages);581 if (!capsnap->dirty_pages)582 continue;583 584 /* get i_size, truncate_{seq,size} for page_snapc? */585 if (snapc && capsnap->context != page_snapc)586 continue;587 588 if (ctl) {589 if (capsnap->writing) {590 ctl->i_size = i_size_read(inode);591 ctl->size_stable = false;592 } else {593 ctl->i_size = capsnap->size;594 ctl->size_stable = true;595 }596 ctl->truncate_size = capsnap->truncate_size;597 ctl->truncate_seq = capsnap->truncate_seq;598 ctl->head_snapc = false;599 }600 601 if (snapc)602 break;603 604 snapc = ceph_get_snap_context(capsnap->context);605 if (!page_snapc ||606 page_snapc == snapc ||607 page_snapc->seq > snapc->seq)608 break;609 }610 if (!snapc && ci->i_wrbuffer_ref_head) {611 snapc = ceph_get_snap_context(ci->i_head_snapc);612 doutc(cl, " head snapc %p has %d dirty pages\n", snapc,613 ci->i_wrbuffer_ref_head);614 if (ctl) {615 ctl->i_size = i_size_read(inode);616 ctl->truncate_size = ci->i_truncate_size;617 ctl->truncate_seq = ci->i_truncate_seq;618 ctl->size_stable = false;619 ctl->head_snapc = true;620 }621 }622 spin_unlock(&ci->i_ceph_lock);623 return snapc;624}625 626static u64 get_writepages_data_length(struct inode *inode,627 struct page *page, u64 start)628{629 struct ceph_inode_info *ci = ceph_inode(inode);630 struct ceph_snap_context *snapc;631 struct ceph_cap_snap *capsnap = NULL;632 u64 end = i_size_read(inode);633 u64 ret;634 635 snapc = page_snap_context(ceph_fscrypt_pagecache_page(page));636 if (snapc != ci->i_head_snapc) {637 bool found = false;638 spin_lock(&ci->i_ceph_lock);639 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {640 if (capsnap->context == snapc) {641 if (!capsnap->writing)642 end = capsnap->size;643 found = true;644 break;645 }646 }647 spin_unlock(&ci->i_ceph_lock);648 WARN_ON(!found);649 }650 if (end > ceph_fscrypt_page_offset(page) + thp_size(page))651 end = ceph_fscrypt_page_offset(page) + thp_size(page);652 ret = end > start ? end - start : 0;653 if (ret && fscrypt_is_bounce_page(page))654 ret = round_up(ret, CEPH_FSCRYPT_BLOCK_SIZE);655 return ret;656}657 658/*659 * Write a single page, but leave the page locked.660 *661 * If we get a write error, mark the mapping for error, but still adjust the662 * dirty page accounting (i.e., page is no longer dirty).663 */664static int writepage_nounlock(struct page *page, struct writeback_control *wbc)665{666 struct folio *folio = page_folio(page);667 struct inode *inode = page->mapping->host;668 struct ceph_inode_info *ci = ceph_inode(inode);669 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);670 struct ceph_client *cl = fsc->client;671 struct ceph_snap_context *snapc, *oldest;672 loff_t page_off = page_offset(page);673 int err;674 loff_t len = thp_size(page);675 loff_t wlen;676 struct ceph_writeback_ctl ceph_wbc;677 struct ceph_osd_client *osdc = &fsc->client->osdc;678 struct ceph_osd_request *req;679 bool caching = ceph_is_cache_enabled(inode);680 struct page *bounce_page = NULL;681 682 doutc(cl, "%llx.%llx page %p idx %lu\n", ceph_vinop(inode), page,683 page->index);684 685 if (ceph_inode_is_shutdown(inode))686 return -EIO;687 688 /* verify this is a writeable snap context */689 snapc = page_snap_context(page);690 if (!snapc) {691 doutc(cl, "%llx.%llx page %p not dirty?\n", ceph_vinop(inode),692 page);693 return 0;694 }695 oldest = get_oldest_context(inode, &ceph_wbc, snapc);696 if (snapc->seq > oldest->seq) {697 doutc(cl, "%llx.%llx page %p snapc %p not writeable - noop\n",698 ceph_vinop(inode), page, snapc);699 /* we should only noop if called by kswapd */700 WARN_ON(!(current->flags & PF_MEMALLOC));701 ceph_put_snap_context(oldest);702 redirty_page_for_writepage(wbc, page);703 return 0;704 }705 ceph_put_snap_context(oldest);706 707 /* is this a partial page at end of file? */708 if (page_off >= ceph_wbc.i_size) {709 doutc(cl, "%llx.%llx folio at %lu beyond eof %llu\n",710 ceph_vinop(inode), folio->index, ceph_wbc.i_size);711 folio_invalidate(folio, 0, folio_size(folio));712 return 0;713 }714 715 if (ceph_wbc.i_size < page_off + len)716 len = ceph_wbc.i_size - page_off;717 718 wlen = IS_ENCRYPTED(inode) ? round_up(len, CEPH_FSCRYPT_BLOCK_SIZE) : len;719 doutc(cl, "%llx.%llx page %p index %lu on %llu~%llu snapc %p seq %lld\n",720 ceph_vinop(inode), page, page->index, page_off, wlen, snapc,721 snapc->seq);722 723 if (atomic_long_inc_return(&fsc->writeback_count) >724 CONGESTION_ON_THRESH(fsc->mount_options->congestion_kb))725 fsc->write_congested = true;726 727 req = ceph_osdc_new_request(osdc, &ci->i_layout, ceph_vino(inode),728 page_off, &wlen, 0, 1, CEPH_OSD_OP_WRITE,729 CEPH_OSD_FLAG_WRITE, snapc,730 ceph_wbc.truncate_seq,731 ceph_wbc.truncate_size, true);732 if (IS_ERR(req)) {733 redirty_page_for_writepage(wbc, page);734 return PTR_ERR(req);735 }736 737 if (wlen < len)738 len = wlen;739 740 set_page_writeback(page);741 if (caching)742 ceph_set_page_fscache(page);743 ceph_fscache_write_to_cache(inode, page_off, len, caching);744 745 if (IS_ENCRYPTED(inode)) {746 bounce_page = fscrypt_encrypt_pagecache_blocks(page,747 CEPH_FSCRYPT_BLOCK_SIZE, 0,748 GFP_NOFS);749 if (IS_ERR(bounce_page)) {750 redirty_page_for_writepage(wbc, page);751 end_page_writeback(page);752 ceph_osdc_put_request(req);753 return PTR_ERR(bounce_page);754 }755 }756 757 /* it may be a short write due to an object boundary */758 WARN_ON_ONCE(len > thp_size(page));759 osd_req_op_extent_osd_data_pages(req, 0,760 bounce_page ? &bounce_page : &page, wlen, 0,761 false, false);762 doutc(cl, "%llx.%llx %llu~%llu (%llu bytes, %sencrypted)\n",763 ceph_vinop(inode), page_off, len, wlen,764 IS_ENCRYPTED(inode) ? "" : "not ");765 766 req->r_mtime = inode_get_mtime(inode);767 ceph_osdc_start_request(osdc, req);768 err = ceph_osdc_wait_request(osdc, req);769 770 ceph_update_write_metrics(&fsc->mdsc->metric, req->r_start_latency,771 req->r_end_latency, len, err);772 fscrypt_free_bounce_page(bounce_page);773 ceph_osdc_put_request(req);774 if (err == 0)775 err = len;776 777 if (err < 0) {778 struct writeback_control tmp_wbc;779 if (!wbc)780 wbc = &tmp_wbc;781 if (err == -ERESTARTSYS) {782 /* killed by SIGKILL */783 doutc(cl, "%llx.%llx interrupted page %p\n",784 ceph_vinop(inode), page);785 redirty_page_for_writepage(wbc, page);786 end_page_writeback(page);787 return err;788 }789 if (err == -EBLOCKLISTED)790 fsc->blocklisted = true;791 doutc(cl, "%llx.%llx setting page/mapping error %d %p\n",792 ceph_vinop(inode), err, page);793 mapping_set_error(&inode->i_data, err);794 wbc->pages_skipped++;795 } else {796 doutc(cl, "%llx.%llx cleaned page %p\n",797 ceph_vinop(inode), page);798 err = 0; /* vfs expects us to return 0 */799 }800 oldest = detach_page_private(page);801 WARN_ON_ONCE(oldest != snapc);802 end_page_writeback(page);803 ceph_put_wrbuffer_cap_refs(ci, 1, snapc);804 ceph_put_snap_context(snapc); /* page's reference */805 806 if (atomic_long_dec_return(&fsc->writeback_count) <807 CONGESTION_OFF_THRESH(fsc->mount_options->congestion_kb))808 fsc->write_congested = false;809 810 return err;811}812 813static int ceph_writepage(struct page *page, struct writeback_control *wbc)814{815 int err;816 struct inode *inode = page->mapping->host;817 BUG_ON(!inode);818 ihold(inode);819 820 if (wbc->sync_mode == WB_SYNC_NONE &&821 ceph_inode_to_fs_client(inode)->write_congested) {822 redirty_page_for_writepage(wbc, page);823 return AOP_WRITEPAGE_ACTIVATE;824 }825 826 folio_wait_private_2(page_folio(page)); /* [DEPRECATED] */827 828 err = writepage_nounlock(page, wbc);829 if (err == -ERESTARTSYS) {830 /* direct memory reclaimer was killed by SIGKILL. return 0831 * to prevent caller from setting mapping/page error */832 err = 0;833 }834 unlock_page(page);835 iput(inode);836 return err;837}838 839/*840 * async writeback completion handler.841 *842 * If we get an error, set the mapping error bit, but not the individual843 * page error bits.844 */845static void writepages_finish(struct ceph_osd_request *req)846{847 struct inode *inode = req->r_inode;848 struct ceph_inode_info *ci = ceph_inode(inode);849 struct ceph_client *cl = ceph_inode_to_client(inode);850 struct ceph_osd_data *osd_data;851 struct page *page;852 int num_pages, total_pages = 0;853 int i, j;854 int rc = req->r_result;855 struct ceph_snap_context *snapc = req->r_snapc;856 struct address_space *mapping = inode->i_mapping;857 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);858 unsigned int len = 0;859 bool remove_page;860 861 doutc(cl, "%llx.%llx rc %d\n", ceph_vinop(inode), rc);862 if (rc < 0) {863 mapping_set_error(mapping, rc);864 ceph_set_error_write(ci);865 if (rc == -EBLOCKLISTED)866 fsc->blocklisted = true;867 } else {868 ceph_clear_error_write(ci);869 }870 871 /*872 * We lost the cache cap, need to truncate the page before873 * it is unlocked, otherwise we'd truncate it later in the874 * page truncation thread, possibly losing some data that875 * raced its way in876 */877 remove_page = !(ceph_caps_issued(ci) &878 (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO));879 880 /* clean all pages */881 for (i = 0; i < req->r_num_ops; i++) {882 if (req->r_ops[i].op != CEPH_OSD_OP_WRITE) {883 pr_warn_client(cl,884 "%llx.%llx incorrect op %d req %p index %d tid %llu\n",885 ceph_vinop(inode), req->r_ops[i].op, req, i,886 req->r_tid);887 break;888 }889 890 osd_data = osd_req_op_extent_osd_data(req, i);891 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES);892 len += osd_data->length;893 num_pages = calc_pages_for((u64)osd_data->alignment,894 (u64)osd_data->length);895 total_pages += num_pages;896 for (j = 0; j < num_pages; j++) {897 page = osd_data->pages[j];898 if (fscrypt_is_bounce_page(page)) {899 page = fscrypt_pagecache_page(page);900 fscrypt_free_bounce_page(osd_data->pages[j]);901 osd_data->pages[j] = page;902 }903 BUG_ON(!page);904 WARN_ON(!PageUptodate(page));905 906 if (atomic_long_dec_return(&fsc->writeback_count) <907 CONGESTION_OFF_THRESH(908 fsc->mount_options->congestion_kb))909 fsc->write_congested = false;910 911 ceph_put_snap_context(detach_page_private(page));912 end_page_writeback(page);913 doutc(cl, "unlocking %p\n", page);914 915 if (remove_page)916 generic_error_remove_folio(inode->i_mapping,917 page_folio(page));918 919 unlock_page(page);920 }921 doutc(cl, "%llx.%llx wrote %llu bytes cleaned %d pages\n",922 ceph_vinop(inode), osd_data->length,923 rc >= 0 ? num_pages : 0);924 925 release_pages(osd_data->pages, num_pages);926 }927 928 ceph_update_write_metrics(&fsc->mdsc->metric, req->r_start_latency,929 req->r_end_latency, len, rc);930 931 ceph_put_wrbuffer_cap_refs(ci, total_pages, snapc);932 933 osd_data = osd_req_op_extent_osd_data(req, 0);934 if (osd_data->pages_from_pool)935 mempool_free(osd_data->pages, ceph_wb_pagevec_pool);936 else937 kfree(osd_data->pages);938 ceph_osdc_put_request(req);939 ceph_dec_osd_stopping_blocker(fsc->mdsc);940}941 942/*943 * initiate async writeback944 */945static int ceph_writepages_start(struct address_space *mapping,946 struct writeback_control *wbc)947{948 struct inode *inode = mapping->host;949 struct ceph_inode_info *ci = ceph_inode(inode);950 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);951 struct ceph_client *cl = fsc->client;952 struct ceph_vino vino = ceph_vino(inode);953 pgoff_t index, start_index, end = -1;954 struct ceph_snap_context *snapc = NULL, *last_snapc = NULL, *pgsnapc;955 struct folio_batch fbatch;956 int rc = 0;957 unsigned int wsize = i_blocksize(inode);958 struct ceph_osd_request *req = NULL;959 struct ceph_writeback_ctl ceph_wbc;960 bool should_loop, range_whole = false;961 bool done = false;962 bool caching = ceph_is_cache_enabled(inode);963 xa_mark_t tag;964 965 if (wbc->sync_mode == WB_SYNC_NONE &&966 fsc->write_congested)967 return 0;968 969 doutc(cl, "%llx.%llx (mode=%s)\n", ceph_vinop(inode),970 wbc->sync_mode == WB_SYNC_NONE ? "NONE" :971 (wbc->sync_mode == WB_SYNC_ALL ? "ALL" : "HOLD"));972 973 if (ceph_inode_is_shutdown(inode)) {974 if (ci->i_wrbuffer_ref > 0) {975 pr_warn_ratelimited_client(cl,976 "%llx.%llx %lld forced umount\n",977 ceph_vinop(inode), ceph_ino(inode));978 }979 mapping_set_error(mapping, -EIO);980 return -EIO; /* we're in a forced umount, don't write! */981 }982 if (fsc->mount_options->wsize < wsize)983 wsize = fsc->mount_options->wsize;984 985 folio_batch_init(&fbatch);986 987 start_index = wbc->range_cyclic ? mapping->writeback_index : 0;988 index = start_index;989 990 if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) {991 tag = PAGECACHE_TAG_TOWRITE;992 } else {993 tag = PAGECACHE_TAG_DIRTY;994 }995retry:996 /* find oldest snap context with dirty data */997 snapc = get_oldest_context(inode, &ceph_wbc, NULL);998 if (!snapc) {999 /* hmm, why does writepages get called when there1000 is no dirty data? */1001 doutc(cl, " no snap context with dirty data?\n");1002 goto out;1003 }1004 doutc(cl, " oldest snapc is %p seq %lld (%d snaps)\n", snapc,1005 snapc->seq, snapc->num_snaps);1006 1007 should_loop = false;1008 if (ceph_wbc.head_snapc && snapc != last_snapc) {1009 /* where to start/end? */1010 if (wbc->range_cyclic) {1011 index = start_index;1012 end = -1;1013 if (index > 0)1014 should_loop = true;1015 doutc(cl, " cyclic, start at %lu\n", index);1016 } else {1017 index = wbc->range_start >> PAGE_SHIFT;1018 end = wbc->range_end >> PAGE_SHIFT;1019 if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)1020 range_whole = true;1021 doutc(cl, " not cyclic, %lu to %lu\n", index, end);1022 }1023 } else if (!ceph_wbc.head_snapc) {1024 /* Do not respect wbc->range_{start,end}. Dirty pages1025 * in that range can be associated with newer snapc.1026 * They are not writeable until we write all dirty pages1027 * associated with 'snapc' get written */1028 if (index > 0)1029 should_loop = true;1030 doutc(cl, " non-head snapc, range whole\n");1031 }1032 1033 if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)1034 tag_pages_for_writeback(mapping, index, end);1035 1036 ceph_put_snap_context(last_snapc);1037 last_snapc = snapc;1038 1039 while (!done && index <= end) {1040 int num_ops = 0, op_idx;1041 unsigned i, nr_folios, max_pages, locked_pages = 0;1042 struct page **pages = NULL, **data_pages;1043 struct page *page;1044 pgoff_t strip_unit_end = 0;1045 u64 offset = 0, len = 0;1046 bool from_pool = false;1047 1048 max_pages = wsize >> PAGE_SHIFT;1049 1050get_more_pages:1051 nr_folios = filemap_get_folios_tag(mapping, &index,1052 end, tag, &fbatch);1053 doutc(cl, "pagevec_lookup_range_tag got %d\n", nr_folios);1054 if (!nr_folios && !locked_pages)1055 break;1056 for (i = 0; i < nr_folios && locked_pages < max_pages; i++) {1057 page = &fbatch.folios[i]->page;1058 doutc(cl, "? %p idx %lu\n", page, page->index);1059 if (locked_pages == 0)1060 lock_page(page); /* first page */1061 else if (!trylock_page(page))1062 break;1063 1064 /* only dirty pages, or our accounting breaks */1065 if (unlikely(!PageDirty(page)) ||1066 unlikely(page->mapping != mapping)) {1067 doutc(cl, "!dirty or !mapping %p\n", page);1068 unlock_page(page);1069 continue;1070 }1071 /* only if matching snap context */1072 pgsnapc = page_snap_context(page);1073 if (pgsnapc != snapc) {1074 doutc(cl, "page snapc %p %lld != oldest %p %lld\n",1075 pgsnapc, pgsnapc->seq, snapc, snapc->seq);1076 if (!should_loop &&1077 !ceph_wbc.head_snapc &&1078 wbc->sync_mode != WB_SYNC_NONE)1079 should_loop = true;1080 unlock_page(page);1081 continue;1082 }1083 if (page_offset(page) >= ceph_wbc.i_size) {1084 struct folio *folio = page_folio(page);1085 1086 doutc(cl, "folio at %lu beyond eof %llu\n",1087 folio->index, ceph_wbc.i_size);1088 if ((ceph_wbc.size_stable ||1089 folio_pos(folio) >= i_size_read(inode)) &&1090 folio_clear_dirty_for_io(folio))1091 folio_invalidate(folio, 0,1092 folio_size(folio));1093 folio_unlock(folio);1094 continue;1095 }1096 if (strip_unit_end && (page->index > strip_unit_end)) {1097 doutc(cl, "end of strip unit %p\n", page);1098 unlock_page(page);1099 break;1100 }1101 if (PageWriteback(page) ||1102 PagePrivate2(page) /* [DEPRECATED] */) {1103 if (wbc->sync_mode == WB_SYNC_NONE) {1104 doutc(cl, "%p under writeback\n", page);1105 unlock_page(page);1106 continue;1107 }1108 doutc(cl, "waiting on writeback %p\n", page);1109 wait_on_page_writeback(page);1110 folio_wait_private_2(page_folio(page)); /* [DEPRECATED] */1111 }1112 1113 if (!clear_page_dirty_for_io(page)) {1114 doutc(cl, "%p !clear_page_dirty_for_io\n", page);1115 unlock_page(page);1116 continue;1117 }1118 1119 /*1120 * We have something to write. If this is1121 * the first locked page this time through,1122 * calculate max possinle write size and1123 * allocate a page array1124 */1125 if (locked_pages == 0) {1126 u64 objnum;1127 u64 objoff;1128 u32 xlen;1129 1130 /* prepare async write request */1131 offset = (u64)page_offset(page);1132 ceph_calc_file_object_mapping(&ci->i_layout,1133 offset, wsize,1134 &objnum, &objoff,1135 &xlen);1136 len = xlen;1137 1138 num_ops = 1;1139 strip_unit_end = page->index +1140 ((len - 1) >> PAGE_SHIFT);1141 1142 BUG_ON(pages);1143 max_pages = calc_pages_for(0, (u64)len);1144 pages = kmalloc_array(max_pages,1145 sizeof(*pages),1146 GFP_NOFS);1147 if (!pages) {1148 from_pool = true;1149 pages = mempool_alloc(ceph_wb_pagevec_pool, GFP_NOFS);1150 BUG_ON(!pages);1151 }1152 1153 len = 0;1154 } else if (page->index !=1155 (offset + len) >> PAGE_SHIFT) {1156 if (num_ops >= (from_pool ? CEPH_OSD_SLAB_OPS :1157 CEPH_OSD_MAX_OPS)) {1158 redirty_page_for_writepage(wbc, page);1159 unlock_page(page);1160 break;1161 }1162 1163 num_ops++;1164 offset = (u64)page_offset(page);1165 len = 0;1166 }1167 1168 /* note position of first page in fbatch */1169 doutc(cl, "%llx.%llx will write page %p idx %lu\n",1170 ceph_vinop(inode), page, page->index);1171 1172 if (atomic_long_inc_return(&fsc->writeback_count) >1173 CONGESTION_ON_THRESH(1174 fsc->mount_options->congestion_kb))1175 fsc->write_congested = true;1176 1177 if (IS_ENCRYPTED(inode)) {1178 pages[locked_pages] =1179 fscrypt_encrypt_pagecache_blocks(page,1180 PAGE_SIZE, 0,1181 locked_pages ? GFP_NOWAIT : GFP_NOFS);1182 if (IS_ERR(pages[locked_pages])) {1183 if (PTR_ERR(pages[locked_pages]) == -EINVAL)1184 pr_err_client(cl,1185 "inode->i_blkbits=%hhu\n",1186 inode->i_blkbits);1187 /* better not fail on first page! */1188 BUG_ON(locked_pages == 0);1189 pages[locked_pages] = NULL;1190 redirty_page_for_writepage(wbc, page);1191 unlock_page(page);1192 break;1193 }1194 ++locked_pages;1195 } else {1196 pages[locked_pages++] = page;1197 }1198 1199 fbatch.folios[i] = NULL;1200 len += thp_size(page);1201 }1202 1203 /* did we get anything? */1204 if (!locked_pages)1205 goto release_folios;1206 if (i) {1207 unsigned j, n = 0;1208 /* shift unused page to beginning of fbatch */1209 for (j = 0; j < nr_folios; j++) {1210 if (!fbatch.folios[j])1211 continue;1212 if (n < j)1213 fbatch.folios[n] = fbatch.folios[j];1214 n++;1215 }1216 fbatch.nr = n;1217 1218 if (nr_folios && i == nr_folios &&1219 locked_pages < max_pages) {1220 doutc(cl, "reached end fbatch, trying for more\n");1221 folio_batch_release(&fbatch);1222 goto get_more_pages;1223 }1224 }1225 1226new_request:1227 offset = ceph_fscrypt_page_offset(pages[0]);1228 len = wsize;1229 1230 req = ceph_osdc_new_request(&fsc->client->osdc,1231 &ci->i_layout, vino,1232 offset, &len, 0, num_ops,1233 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE,1234 snapc, ceph_wbc.truncate_seq,1235 ceph_wbc.truncate_size, false);1236 if (IS_ERR(req)) {1237 req = ceph_osdc_new_request(&fsc->client->osdc,1238 &ci->i_layout, vino,1239 offset, &len, 0,1240 min(num_ops,1241 CEPH_OSD_SLAB_OPS),1242 CEPH_OSD_OP_WRITE,1243 CEPH_OSD_FLAG_WRITE,1244 snapc, ceph_wbc.truncate_seq,1245 ceph_wbc.truncate_size, true);1246 BUG_ON(IS_ERR(req));1247 }1248 BUG_ON(len < ceph_fscrypt_page_offset(pages[locked_pages - 1]) +1249 thp_size(pages[locked_pages - 1]) - offset);1250 1251 if (!ceph_inc_osd_stopping_blocker(fsc->mdsc)) {1252 rc = -EIO;1253 goto release_folios;1254 }1255 req->r_callback = writepages_finish;1256 req->r_inode = inode;1257 1258 /* Format the osd request message and submit the write */1259 len = 0;1260 data_pages = pages;1261 op_idx = 0;1262 for (i = 0; i < locked_pages; i++) {1263 struct page *page = ceph_fscrypt_pagecache_page(pages[i]);1264 1265 u64 cur_offset = page_offset(page);1266 /*1267 * Discontinuity in page range? Ceph can handle that by just passing1268 * multiple extents in the write op.1269 */1270 if (offset + len != cur_offset) {1271 /* If it's full, stop here */1272 if (op_idx + 1 == req->r_num_ops)1273 break;1274 1275 /* Kick off an fscache write with what we have so far. */1276 ceph_fscache_write_to_cache(inode, offset, len, caching);1277 1278 /* Start a new extent */1279 osd_req_op_extent_dup_last(req, op_idx,1280 cur_offset - offset);1281 doutc(cl, "got pages at %llu~%llu\n", offset,1282 len);1283 osd_req_op_extent_osd_data_pages(req, op_idx,1284 data_pages, len, 0,1285 from_pool, false);1286 osd_req_op_extent_update(req, op_idx, len);1287 1288 len = 0;1289 offset = cur_offset;1290 data_pages = pages + i;1291 op_idx++;1292 }1293 1294 set_page_writeback(page);1295 if (caching)1296 ceph_set_page_fscache(page);1297 len += thp_size(page);1298 }1299 ceph_fscache_write_to_cache(inode, offset, len, caching);1300 1301 if (ceph_wbc.size_stable) {1302 len = min(len, ceph_wbc.i_size - offset);1303 } else if (i == locked_pages) {1304 /* writepages_finish() clears writeback pages1305 * according to the data length, so make sure1306 * data length covers all locked pages */1307 u64 min_len = len + 1 - thp_size(page);1308 len = get_writepages_data_length(inode, pages[i - 1],1309 offset);1310 len = max(len, min_len);1311 }1312 if (IS_ENCRYPTED(inode))1313 len = round_up(len, CEPH_FSCRYPT_BLOCK_SIZE);1314 1315 doutc(cl, "got pages at %llu~%llu\n", offset, len);1316 1317 if (IS_ENCRYPTED(inode) &&1318 ((offset | len) & ~CEPH_FSCRYPT_BLOCK_MASK))1319 pr_warn_client(cl,1320 "bad encrypted write offset=%lld len=%llu\n",1321 offset, len);1322 1323 osd_req_op_extent_osd_data_pages(req, op_idx, data_pages, len,1324 0, from_pool, false);1325 osd_req_op_extent_update(req, op_idx, len);1326 1327 BUG_ON(op_idx + 1 != req->r_num_ops);1328 1329 from_pool = false;1330 if (i < locked_pages) {1331 BUG_ON(num_ops <= req->r_num_ops);1332 num_ops -= req->r_num_ops;1333 locked_pages -= i;1334 1335 /* allocate new pages array for next request */1336 data_pages = pages;1337 pages = kmalloc_array(locked_pages, sizeof(*pages),1338 GFP_NOFS);1339 if (!pages) {1340 from_pool = true;1341 pages = mempool_alloc(ceph_wb_pagevec_pool, GFP_NOFS);1342 BUG_ON(!pages);1343 }1344 memcpy(pages, data_pages + i,1345 locked_pages * sizeof(*pages));1346 memset(data_pages + i, 0,1347 locked_pages * sizeof(*pages));1348 } else {1349 BUG_ON(num_ops != req->r_num_ops);1350 index = pages[i - 1]->index + 1;1351 /* request message now owns the pages array */1352 pages = NULL;1353 }1354 1355 req->r_mtime = inode_get_mtime(inode);1356 ceph_osdc_start_request(&fsc->client->osdc, req);1357 req = NULL;1358 1359 wbc->nr_to_write -= i;1360 if (pages)1361 goto new_request;1362 1363 /*1364 * We stop writing back only if we are not doing1365 * integrity sync. In case of integrity sync we have to1366 * keep going until we have written all the pages1367 * we tagged for writeback prior to entering this loop.1368 */1369 if (wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE)1370 done = true;1371 1372release_folios:1373 doutc(cl, "folio_batch release on %d folios (%p)\n",1374 (int)fbatch.nr, fbatch.nr ? fbatch.folios[0] : NULL);1375 folio_batch_release(&fbatch);1376 }1377 1378 if (should_loop && !done) {1379 /* more to do; loop back to beginning of file */1380 doutc(cl, "looping back to beginning of file\n");1381 end = start_index - 1; /* OK even when start_index == 0 */1382 1383 /* to write dirty pages associated with next snapc,1384 * we need to wait until current writes complete */1385 if (wbc->sync_mode != WB_SYNC_NONE &&1386 start_index == 0 && /* all dirty pages were checked */1387 !ceph_wbc.head_snapc) {1388 struct page *page;1389 unsigned i, nr;1390 index = 0;1391 while ((index <= end) &&1392 (nr = filemap_get_folios_tag(mapping, &index,1393 (pgoff_t)-1,1394 PAGECACHE_TAG_WRITEBACK,1395 &fbatch))) {1396 for (i = 0; i < nr; i++) {1397 page = &fbatch.folios[i]->page;1398 if (page_snap_context(page) != snapc)1399 continue;1400 wait_on_page_writeback(page);1401 }1402 folio_batch_release(&fbatch);1403 cond_resched();1404 }1405 }1406 1407 start_index = 0;1408 index = 0;1409 goto retry;1410 }1411 1412 if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))1413 mapping->writeback_index = index;1414 1415out:1416 ceph_osdc_put_request(req);1417 ceph_put_snap_context(last_snapc);1418 doutc(cl, "%llx.%llx dend - startone, rc = %d\n", ceph_vinop(inode),1419 rc);1420 return rc;1421}1422 1423 1424 1425/*1426 * See if a given @snapc is either writeable, or already written.1427 */1428static int context_is_writeable_or_written(struct inode *inode,1429 struct ceph_snap_context *snapc)1430{1431 struct ceph_snap_context *oldest = get_oldest_context(inode, NULL, NULL);1432 int ret = !oldest || snapc->seq <= oldest->seq;1433 1434 ceph_put_snap_context(oldest);1435 return ret;1436}1437 1438/**1439 * ceph_find_incompatible - find an incompatible context and return it1440 * @page: page being dirtied1441 *1442 * We are only allowed to write into/dirty a page if the page is1443 * clean, or already dirty within the same snap context. Returns a1444 * conflicting context if there is one, NULL if there isn't, or a1445 * negative error code on other errors.1446 *1447 * Must be called with page lock held.1448 */1449static struct ceph_snap_context *1450ceph_find_incompatible(struct page *page)1451{1452 struct inode *inode = page->mapping->host;1453 struct ceph_client *cl = ceph_inode_to_client(inode);1454 struct ceph_inode_info *ci = ceph_inode(inode);1455 1456 if (ceph_inode_is_shutdown(inode)) {1457 doutc(cl, " %llx.%llx page %p is shutdown\n",1458 ceph_vinop(inode), page);1459 return ERR_PTR(-ESTALE);1460 }1461 1462 for (;;) {1463 struct ceph_snap_context *snapc, *oldest;1464 1465 wait_on_page_writeback(page);1466 1467 snapc = page_snap_context(page);1468 if (!snapc || snapc == ci->i_head_snapc)1469 break;1470 1471 /*1472 * this page is already dirty in another (older) snap1473 * context! is it writeable now?1474 */1475 oldest = get_oldest_context(inode, NULL, NULL);1476 if (snapc->seq > oldest->seq) {1477 /* not writeable -- return it for the caller to deal with */1478 ceph_put_snap_context(oldest);1479 doutc(cl, " %llx.%llx page %p snapc %p not current or oldest\n",1480 ceph_vinop(inode), page, snapc);1481 return ceph_get_snap_context(snapc);1482 }1483 ceph_put_snap_context(oldest);1484 1485 /* yay, writeable, do it now (without dropping page lock) */1486 doutc(cl, " %llx.%llx page %p snapc %p not current, but oldest\n",1487 ceph_vinop(inode), page, snapc);1488 if (clear_page_dirty_for_io(page)) {1489 int r = writepage_nounlock(page, NULL);1490 if (r < 0)1491 return ERR_PTR(r);1492 }1493 }1494 return NULL;1495}1496 1497static int ceph_netfs_check_write_begin(struct file *file, loff_t pos, unsigned int len,1498 struct folio **foliop, void **_fsdata)1499{1500 struct inode *inode = file_inode(file);1501 struct ceph_inode_info *ci = ceph_inode(inode);1502 struct ceph_snap_context *snapc;1503 1504 snapc = ceph_find_incompatible(folio_page(*foliop, 0));1505 if (snapc) {1506 int r;1507 1508 folio_unlock(*foliop);1509 folio_put(*foliop);1510 *foliop = NULL;1511 if (IS_ERR(snapc))1512 return PTR_ERR(snapc);1513 1514 ceph_queue_writeback(inode);1515 r = wait_event_killable(ci->i_cap_wq,1516 context_is_writeable_or_written(inode, snapc));1517 ceph_put_snap_context(snapc);1518 return r == 0 ? -EAGAIN : r;1519 }1520 return 0;1521}1522 1523/*1524 * We are only allowed to write into/dirty the page if the page is1525 * clean, or already dirty within the same snap context.1526 */1527static int ceph_write_begin(struct file *file, struct address_space *mapping,1528 loff_t pos, unsigned len,1529 struct folio **foliop, void **fsdata)1530{1531 struct inode *inode = file_inode(file);1532 struct ceph_inode_info *ci = ceph_inode(inode);1533 int r;1534 1535 r = netfs_write_begin(&ci->netfs, file, inode->i_mapping, pos, len, foliop, NULL);1536 if (r < 0)1537 return r;1538 1539 folio_wait_private_2(*foliop); /* [DEPRECATED] */1540 WARN_ON_ONCE(!folio_test_locked(*foliop));1541 return 0;1542}1543 1544/*1545 * we don't do anything in here that simple_write_end doesn't do1546 * except adjust dirty page accounting1547 */1548static int ceph_write_end(struct file *file, struct address_space *mapping,1549 loff_t pos, unsigned len, unsigned copied,1550 struct folio *folio, void *fsdata)1551{1552 struct inode *inode = file_inode(file);1553 struct ceph_client *cl = ceph_inode_to_client(inode);1554 bool check_cap = false;1555 1556 doutc(cl, "%llx.%llx file %p folio %p %d~%d (%d)\n", ceph_vinop(inode),1557 file, folio, (int)pos, (int)copied, (int)len);1558 1559 if (!folio_test_uptodate(folio)) {1560 /* just return that nothing was copied on a short copy */1561 if (copied < len) {1562 copied = 0;1563 goto out;1564 }1565 folio_mark_uptodate(folio);1566 }1567 1568 /* did file size increase? */1569 if (pos+copied > i_size_read(inode))1570 check_cap = ceph_inode_set_size(inode, pos+copied);1571 1572 folio_mark_dirty(folio);1573 1574out:1575 folio_unlock(folio);1576 folio_put(folio);1577 1578 if (check_cap)1579 ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY);1580 1581 return copied;1582}1583 1584const struct address_space_operations ceph_aops = {1585 .read_folio = netfs_read_folio,1586 .readahead = netfs_readahead,1587 .writepage = ceph_writepage,1588 .writepages = ceph_writepages_start,1589 .write_begin = ceph_write_begin,1590 .write_end = ceph_write_end,1591 .dirty_folio = ceph_dirty_folio,1592 .invalidate_folio = ceph_invalidate_folio,1593 .release_folio = netfs_release_folio,1594 .direct_IO = noop_direct_IO,1595};1596 1597static void ceph_block_sigs(sigset_t *oldset)1598{1599 sigset_t mask;1600 siginitsetinv(&mask, sigmask(SIGKILL));1601 sigprocmask(SIG_BLOCK, &mask, oldset);1602}1603 1604static void ceph_restore_sigs(sigset_t *oldset)1605{1606 sigprocmask(SIG_SETMASK, oldset, NULL);1607}1608 1609/*1610 * vm ops1611 */1612static vm_fault_t ceph_filemap_fault(struct vm_fault *vmf)1613{1614 struct vm_area_struct *vma = vmf->vma;1615 struct inode *inode = file_inode(vma->vm_file);1616 struct ceph_inode_info *ci = ceph_inode(inode);1617 struct ceph_client *cl = ceph_inode_to_client(inode);1618 struct ceph_file_info *fi = vma->vm_file->private_data;1619 loff_t off = (loff_t)vmf->pgoff << PAGE_SHIFT;1620 int want, got, err;1621 sigset_t oldset;1622 vm_fault_t ret = VM_FAULT_SIGBUS;1623 1624 if (ceph_inode_is_shutdown(inode))1625 return ret;1626 1627 ceph_block_sigs(&oldset);1628 1629 doutc(cl, "%llx.%llx %llu trying to get caps\n",1630 ceph_vinop(inode), off);1631 if (fi->fmode & CEPH_FILE_MODE_LAZY)1632 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;1633 else1634 want = CEPH_CAP_FILE_CACHE;1635 1636 got = 0;1637 err = ceph_get_caps(vma->vm_file, CEPH_CAP_FILE_RD, want, -1, &got);1638 if (err < 0)1639 goto out_restore;1640 1641 doutc(cl, "%llx.%llx %llu got cap refs on %s\n", ceph_vinop(inode),1642 off, ceph_cap_string(got));1643 1644 if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) ||1645 !ceph_has_inline_data(ci)) {1646 CEPH_DEFINE_RW_CONTEXT(rw_ctx, got);1647 ceph_add_rw_context(fi, &rw_ctx);1648 ret = filemap_fault(vmf);1649 ceph_del_rw_context(fi, &rw_ctx);1650 doutc(cl, "%llx.%llx %llu drop cap refs %s ret %x\n",1651 ceph_vinop(inode), off, ceph_cap_string(got), ret);1652 } else1653 err = -EAGAIN;1654 1655 ceph_put_cap_refs(ci, got);1656 1657 if (err != -EAGAIN)1658 goto out_restore;1659 1660 /* read inline data */1661 if (off >= PAGE_SIZE) {1662 /* does not support inline data > PAGE_SIZE */1663 ret = VM_FAULT_SIGBUS;1664 } else {1665 struct address_space *mapping = inode->i_mapping;1666 struct page *page;1667 1668 filemap_invalidate_lock_shared(mapping);1669 page = find_or_create_page(mapping, 0,1670 mapping_gfp_constraint(mapping, ~__GFP_FS));1671 if (!page) {1672 ret = VM_FAULT_OOM;1673 goto out_inline;1674 }1675 err = __ceph_do_getattr(inode, page,1676 CEPH_STAT_CAP_INLINE_DATA, true);1677 if (err < 0 || off >= i_size_read(inode)) {1678 unlock_page(page);1679 put_page(page);1680 ret = vmf_error(err);1681 goto out_inline;1682 }1683 if (err < PAGE_SIZE)1684 zero_user_segment(page, err, PAGE_SIZE);1685 else1686 flush_dcache_page(page);1687 SetPageUptodate(page);1688 vmf->page = page;1689 ret = VM_FAULT_MAJOR | VM_FAULT_LOCKED;1690out_inline:1691 filemap_invalidate_unlock_shared(mapping);1692 doutc(cl, "%llx.%llx %llu read inline data ret %x\n",1693 ceph_vinop(inode), off, ret);1694 }1695out_restore:1696 ceph_restore_sigs(&oldset);1697 if (err < 0)1698 ret = vmf_error(err);1699 1700 return ret;1701}1702 1703static vm_fault_t ceph_page_mkwrite(struct vm_fault *vmf)1704{1705 struct vm_area_struct *vma = vmf->vma;1706 struct inode *inode = file_inode(vma->vm_file);1707 struct ceph_client *cl = ceph_inode_to_client(inode);1708 struct ceph_inode_info *ci = ceph_inode(inode);1709 struct ceph_file_info *fi = vma->vm_file->private_data;1710 struct ceph_cap_flush *prealloc_cf;1711 struct page *page = vmf->page;1712 loff_t off = page_offset(page);1713 loff_t size = i_size_read(inode);1714 size_t len;1715 int want, got, err;1716 sigset_t oldset;1717 vm_fault_t ret = VM_FAULT_SIGBUS;1718 1719 if (ceph_inode_is_shutdown(inode))1720 return ret;1721 1722 prealloc_cf = ceph_alloc_cap_flush();1723 if (!prealloc_cf)1724 return VM_FAULT_OOM;1725 1726 sb_start_pagefault(inode->i_sb);1727 ceph_block_sigs(&oldset);1728 1729 if (off + thp_size(page) <= size)1730 len = thp_size(page);1731 else1732 len = offset_in_thp(page, size);1733 1734 doutc(cl, "%llx.%llx %llu~%zd getting caps i_size %llu\n",1735 ceph_vinop(inode), off, len, size);1736 if (fi->fmode & CEPH_FILE_MODE_LAZY)1737 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;1738 else1739 want = CEPH_CAP_FILE_BUFFER;1740 1741 got = 0;1742 err = ceph_get_caps(vma->vm_file, CEPH_CAP_FILE_WR, want, off + len, &got);1743 if (err < 0)1744 goto out_free;1745 1746 doutc(cl, "%llx.%llx %llu~%zd got cap refs on %s\n", ceph_vinop(inode),1747 off, len, ceph_cap_string(got));1748 1749 /* Update time before taking page lock */1750 file_update_time(vma->vm_file);1751 inode_inc_iversion_raw(inode);1752 1753 do {1754 struct ceph_snap_context *snapc;1755 1756 lock_page(page);1757 1758 if (page_mkwrite_check_truncate(page, inode) < 0) {1759 unlock_page(page);1760 ret = VM_FAULT_NOPAGE;1761 break;1762 }1763 1764 snapc = ceph_find_incompatible(page);1765 if (!snapc) {1766 /* success. we'll keep the page locked. */1767 set_page_dirty(page);1768 ret = VM_FAULT_LOCKED;1769 break;1770 }1771 1772 unlock_page(page);1773 1774 if (IS_ERR(snapc)) {1775 ret = VM_FAULT_SIGBUS;1776 break;1777 }1778 1779 ceph_queue_writeback(inode);1780 err = wait_event_killable(ci->i_cap_wq,1781 context_is_writeable_or_written(inode, snapc));1782 ceph_put_snap_context(snapc);1783 } while (err == 0);1784 1785 if (ret == VM_FAULT_LOCKED) {1786 int dirty;1787 spin_lock(&ci->i_ceph_lock);1788 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,1789 &prealloc_cf);1790 spin_unlock(&ci->i_ceph_lock);1791 if (dirty)1792 __mark_inode_dirty(inode, dirty);1793 }1794 1795 doutc(cl, "%llx.%llx %llu~%zd dropping cap refs on %s ret %x\n",1796 ceph_vinop(inode), off, len, ceph_cap_string(got), ret);1797 ceph_put_cap_refs_async(ci, got);1798out_free:1799 ceph_restore_sigs(&oldset);1800 sb_end_pagefault(inode->i_sb);1801 ceph_free_cap_flush(prealloc_cf);1802 if (err < 0)1803 ret = vmf_error(err);1804 return ret;1805}1806 1807void ceph_fill_inline_data(struct inode *inode, struct page *locked_page,1808 char *data, size_t len)1809{1810 struct ceph_client *cl = ceph_inode_to_client(inode);1811 struct address_space *mapping = inode->i_mapping;1812 struct page *page;1813 1814 if (locked_page) {1815 page = locked_page;1816 } else {1817 if (i_size_read(inode) == 0)1818 return;1819 page = find_or_create_page(mapping, 0,1820 mapping_gfp_constraint(mapping,1821 ~__GFP_FS));1822 if (!page)1823 return;1824 if (PageUptodate(page)) {1825 unlock_page(page);1826 put_page(page);1827 return;1828 }1829 }1830 1831 doutc(cl, "%p %llx.%llx len %zu locked_page %p\n", inode,1832 ceph_vinop(inode), len, locked_page);1833 1834 if (len > 0) {1835 void *kaddr = kmap_atomic(page);1836 memcpy(kaddr, data, len);1837 kunmap_atomic(kaddr);1838 }1839 1840 if (page != locked_page) {1841 if (len < PAGE_SIZE)1842 zero_user_segment(page, len, PAGE_SIZE);1843 else1844 flush_dcache_page(page);1845 1846 SetPageUptodate(page);1847 unlock_page(page);1848 put_page(page);1849 }1850}1851 1852int ceph_uninline_data(struct file *file)1853{1854 struct inode *inode = file_inode(file);1855 struct ceph_inode_info *ci = ceph_inode(inode);1856 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);1857 struct ceph_client *cl = fsc->client;1858 struct ceph_osd_request *req = NULL;1859 struct ceph_cap_flush *prealloc_cf = NULL;1860 struct folio *folio = NULL;1861 u64 inline_version = CEPH_INLINE_NONE;1862 struct page *pages[1];1863 int err = 0;1864 u64 len;1865 1866 spin_lock(&ci->i_ceph_lock);1867 inline_version = ci->i_inline_version;1868 spin_unlock(&ci->i_ceph_lock);1869 1870 doutc(cl, "%llx.%llx inline_version %llu\n", ceph_vinop(inode),1871 inline_version);1872 1873 if (ceph_inode_is_shutdown(inode)) {1874 err = -EIO;1875 goto out;1876 }1877 1878 if (inline_version == CEPH_INLINE_NONE)1879 return 0;1880 1881 prealloc_cf = ceph_alloc_cap_flush();1882 if (!prealloc_cf)1883 return -ENOMEM;1884 1885 if (inline_version == 1) /* initial version, no data */1886 goto out_uninline;1887 1888 folio = read_mapping_folio(inode->i_mapping, 0, file);1889 if (IS_ERR(folio)) {1890 err = PTR_ERR(folio);1891 goto out;1892 }1893 1894 folio_lock(folio);1895 1896 len = i_size_read(inode);1897 if (len > folio_size(folio))1898 len = folio_size(folio);1899 1900 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,1901 ceph_vino(inode), 0, &len, 0, 1,1902 CEPH_OSD_OP_CREATE, CEPH_OSD_FLAG_WRITE,1903 NULL, 0, 0, false);1904 if (IS_ERR(req)) {1905 err = PTR_ERR(req);1906 goto out_unlock;1907 }1908 1909 req->r_mtime = inode_get_mtime(inode);1910 ceph_osdc_start_request(&fsc->client->osdc, req);1911 err = ceph_osdc_wait_request(&fsc->client->osdc, req);1912 ceph_osdc_put_request(req);1913 if (err < 0)1914 goto out_unlock;1915 1916 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,1917 ceph_vino(inode), 0, &len, 1, 3,1918 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE,1919 NULL, ci->i_truncate_seq,1920 ci->i_truncate_size, false);1921 if (IS_ERR(req)) {1922 err = PTR_ERR(req);1923 goto out_unlock;1924 }1925 1926 pages[0] = folio_page(folio, 0);1927 osd_req_op_extent_osd_data_pages(req, 1, pages, len, 0, false, false);1928 1929 {1930 __le64 xattr_buf = cpu_to_le64(inline_version);1931 err = osd_req_op_xattr_init(req, 0, CEPH_OSD_OP_CMPXATTR,1932 "inline_version", &xattr_buf,1933 sizeof(xattr_buf),1934 CEPH_OSD_CMPXATTR_OP_GT,1935 CEPH_OSD_CMPXATTR_MODE_U64);1936 if (err)1937 goto out_put_req;1938 }1939 1940 {1941 char xattr_buf[32];1942 int xattr_len = snprintf(xattr_buf, sizeof(xattr_buf),1943 "%llu", inline_version);1944 err = osd_req_op_xattr_init(req, 2, CEPH_OSD_OP_SETXATTR,1945 "inline_version",1946 xattr_buf, xattr_len, 0, 0);1947 if (err)1948 goto out_put_req;1949 }1950 1951 req->r_mtime = inode_get_mtime(inode);1952 ceph_osdc_start_request(&fsc->client->osdc, req);1953 err = ceph_osdc_wait_request(&fsc->client->osdc, req);1954 1955 ceph_update_write_metrics(&fsc->mdsc->metric, req->r_start_latency,1956 req->r_end_latency, len, err);1957 1958out_uninline:1959 if (!err) {1960 int dirty;1961 1962 /* Set to CAP_INLINE_NONE and dirty the caps */1963 down_read(&fsc->mdsc->snap_rwsem);1964 spin_lock(&ci->i_ceph_lock);1965 ci->i_inline_version = CEPH_INLINE_NONE;1966 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR, &prealloc_cf);1967 spin_unlock(&ci->i_ceph_lock);1968 up_read(&fsc->mdsc->snap_rwsem);1969 if (dirty)1970 __mark_inode_dirty(inode, dirty);1971 }1972out_put_req:1973 ceph_osdc_put_request(req);1974 if (err == -ECANCELED)1975 err = 0;1976out_unlock:1977 if (folio) {1978 folio_unlock(folio);1979 folio_put(folio);1980 }1981out:1982 ceph_free_cap_flush(prealloc_cf);1983 doutc(cl, "%llx.%llx inline_version %llu = %d\n",1984 ceph_vinop(inode), inline_version, err);1985 return err;1986}1987 1988static const struct vm_operations_struct ceph_vmops = {1989 .fault = ceph_filemap_fault,1990 .page_mkwrite = ceph_page_mkwrite,1991};1992 1993int ceph_mmap(struct file *file, struct vm_area_struct *vma)1994{1995 struct address_space *mapping = file->f_mapping;1996 1997 if (!mapping->a_ops->read_folio)1998 return -ENOEXEC;1999 vma->vm_ops = &ceph_vmops;2000 return 0;2001}2002 2003enum {2004 POOL_READ = 1,2005 POOL_WRITE = 2,2006};2007 2008static int __ceph_pool_perm_get(struct ceph_inode_info *ci,2009 s64 pool, struct ceph_string *pool_ns)2010{2011 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(&ci->netfs.inode);2012 struct ceph_mds_client *mdsc = fsc->mdsc;2013 struct ceph_client *cl = fsc->client;2014 struct ceph_osd_request *rd_req = NULL, *wr_req = NULL;2015 struct rb_node **p, *parent;2016 struct ceph_pool_perm *perm;2017 struct page **pages;2018 size_t pool_ns_len;2019 int err = 0, err2 = 0, have = 0;2020 2021 down_read(&mdsc->pool_perm_rwsem);2022 p = &mdsc->pool_perm_tree.rb_node;2023 while (*p) {2024 perm = rb_entry(*p, struct ceph_pool_perm, node);2025 if (pool < perm->pool)2026 p = &(*p)->rb_left;2027 else if (pool > perm->pool)2028 p = &(*p)->rb_right;2029 else {2030 int ret = ceph_compare_string(pool_ns,2031 perm->pool_ns,2032 perm->pool_ns_len);2033 if (ret < 0)2034 p = &(*p)->rb_left;2035 else if (ret > 0)2036 p = &(*p)->rb_right;2037 else {2038 have = perm->perm;2039 break;2040 }2041 }2042 }2043 up_read(&mdsc->pool_perm_rwsem);2044 if (*p)2045 goto out;2046 2047 if (pool_ns)2048 doutc(cl, "pool %lld ns %.*s no perm cached\n", pool,2049 (int)pool_ns->len, pool_ns->str);2050 else2051 doutc(cl, "pool %lld no perm cached\n", pool);2052 2053 down_write(&mdsc->pool_perm_rwsem);2054 p = &mdsc->pool_perm_tree.rb_node;2055 parent = NULL;2056 while (*p) {2057 parent = *p;2058 perm = rb_entry(parent, struct ceph_pool_perm, node);2059 if (pool < perm->pool)2060 p = &(*p)->rb_left;2061 else if (pool > perm->pool)2062 p = &(*p)->rb_right;2063 else {2064 int ret = ceph_compare_string(pool_ns,2065 perm->pool_ns,2066 perm->pool_ns_len);2067 if (ret < 0)2068 p = &(*p)->rb_left;2069 else if (ret > 0)2070 p = &(*p)->rb_right;2071 else {2072 have = perm->perm;2073 break;2074 }2075 }2076 }2077 if (*p) {2078 up_write(&mdsc->pool_perm_rwsem);2079 goto out;2080 }2081 2082 rd_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL,2083 1, false, GFP_NOFS);2084 if (!rd_req) {2085 err = -ENOMEM;2086 goto out_unlock;2087 }2088 2089 rd_req->r_flags = CEPH_OSD_FLAG_READ;2090 osd_req_op_init(rd_req, 0, CEPH_OSD_OP_STAT, 0);2091 rd_req->r_base_oloc.pool = pool;2092 if (pool_ns)2093 rd_req->r_base_oloc.pool_ns = ceph_get_string(pool_ns);2094 ceph_oid_printf(&rd_req->r_base_oid, "%llx.00000000", ci->i_vino.ino);2095 2096 err = ceph_osdc_alloc_messages(rd_req, GFP_NOFS);2097 if (err)2098 goto out_unlock;2099 2100 wr_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL,2101 1, false, GFP_NOFS);2102 if (!wr_req) {2103 err = -ENOMEM;2104 goto out_unlock;2105 }2106 2107 wr_req->r_flags = CEPH_OSD_FLAG_WRITE;2108 osd_req_op_init(wr_req, 0, CEPH_OSD_OP_CREATE, CEPH_OSD_OP_FLAG_EXCL);2109 ceph_oloc_copy(&wr_req->r_base_oloc, &rd_req->r_base_oloc);2110 ceph_oid_copy(&wr_req->r_base_oid, &rd_req->r_base_oid);2111 2112 err = ceph_osdc_alloc_messages(wr_req, GFP_NOFS);2113 if (err)2114 goto out_unlock;2115 2116 /* one page should be large enough for STAT data */2117 pages = ceph_alloc_page_vector(1, GFP_KERNEL);2118 if (IS_ERR(pages)) {2119 err = PTR_ERR(pages);2120 goto out_unlock;2121 }2122 2123 osd_req_op_raw_data_in_pages(rd_req, 0, pages, PAGE_SIZE,2124 0, false, true);2125 ceph_osdc_start_request(&fsc->client->osdc, rd_req);2126 2127 wr_req->r_mtime = inode_get_mtime(&ci->netfs.inode);2128 ceph_osdc_start_request(&fsc->client->osdc, wr_req);2129 2130 err = ceph_osdc_wait_request(&fsc->client->osdc, rd_req);2131 err2 = ceph_osdc_wait_request(&fsc->client->osdc, wr_req);2132 2133 if (err >= 0 || err == -ENOENT)2134 have |= POOL_READ;2135 else if (err != -EPERM) {2136 if (err == -EBLOCKLISTED)2137 fsc->blocklisted = true;2138 goto out_unlock;2139 }2140 2141 if (err2 == 0 || err2 == -EEXIST)2142 have |= POOL_WRITE;2143 else if (err2 != -EPERM) {2144 if (err2 == -EBLOCKLISTED)2145 fsc->blocklisted = true;2146 err = err2;2147 goto out_unlock;2148 }2149 2150 pool_ns_len = pool_ns ? pool_ns->len : 0;2151 perm = kmalloc(struct_size(perm, pool_ns, pool_ns_len + 1), GFP_NOFS);2152 if (!perm) {2153 err = -ENOMEM;2154 goto out_unlock;2155 }2156 2157 perm->pool = pool;2158 perm->perm = have;2159 perm->pool_ns_len = pool_ns_len;2160 if (pool_ns_len > 0)2161 memcpy(perm->pool_ns, pool_ns->str, pool_ns_len);2162 perm->pool_ns[pool_ns_len] = 0;2163 2164 rb_link_node(&perm->node, parent, p);2165 rb_insert_color(&perm->node, &mdsc->pool_perm_tree);2166 err = 0;2167out_unlock:2168 up_write(&mdsc->pool_perm_rwsem);2169 2170 ceph_osdc_put_request(rd_req);2171 ceph_osdc_put_request(wr_req);2172out:2173 if (!err)2174 err = have;2175 if (pool_ns)2176 doutc(cl, "pool %lld ns %.*s result = %d\n", pool,2177 (int)pool_ns->len, pool_ns->str, err);2178 else2179 doutc(cl, "pool %lld result = %d\n", pool, err);2180 return err;2181}2182 2183int ceph_pool_perm_check(struct inode *inode, int need)2184{2185 struct ceph_client *cl = ceph_inode_to_client(inode);2186 struct ceph_inode_info *ci = ceph_inode(inode);2187 struct ceph_string *pool_ns;2188 s64 pool;2189 int ret, flags;2190 2191 /* Only need to do this for regular files */2192 if (!S_ISREG(inode->i_mode))2193 return 0;2194 2195 if (ci->i_vino.snap != CEPH_NOSNAP) {2196 /*2197 * Pool permission check needs to write to the first object.2198 * But for snapshot, head of the first object may have alread2199 * been deleted. Skip check to avoid creating orphan object.2200 */2201 return 0;2202 }2203 2204 if (ceph_test_mount_opt(ceph_inode_to_fs_client(inode),2205 NOPOOLPERM))2206 return 0;2207 2208 spin_lock(&ci->i_ceph_lock);2209 flags = ci->i_ceph_flags;2210 pool = ci->i_layout.pool_id;2211 spin_unlock(&ci->i_ceph_lock);2212check:2213 if (flags & CEPH_I_POOL_PERM) {2214 if ((need & CEPH_CAP_FILE_RD) && !(flags & CEPH_I_POOL_RD)) {2215 doutc(cl, "pool %lld no read perm\n", pool);2216 return -EPERM;2217 }2218 if ((need & CEPH_CAP_FILE_WR) && !(flags & CEPH_I_POOL_WR)) {2219 doutc(cl, "pool %lld no write perm\n", pool);2220 return -EPERM;2221 }2222 return 0;2223 }2224 2225 pool_ns = ceph_try_get_string(ci->i_layout.pool_ns);2226 ret = __ceph_pool_perm_get(ci, pool, pool_ns);2227 ceph_put_string(pool_ns);2228 if (ret < 0)2229 return ret;2230 2231 flags = CEPH_I_POOL_PERM;2232 if (ret & POOL_READ)2233 flags |= CEPH_I_POOL_RD;2234 if (ret & POOL_WRITE)2235 flags |= CEPH_I_POOL_WR;2236 2237 spin_lock(&ci->i_ceph_lock);2238 if (pool == ci->i_layout.pool_id &&2239 pool_ns == rcu_dereference_raw(ci->i_layout.pool_ns)) {2240 ci->i_ceph_flags |= flags;2241 } else {2242 pool = ci->i_layout.pool_id;2243 flags = ci->i_ceph_flags;2244 }2245 spin_unlock(&ci->i_ceph_lock);2246 goto check;2247}2248 2249void ceph_pool_perm_destroy(struct ceph_mds_client *mdsc)2250{2251 struct ceph_pool_perm *perm;2252 struct rb_node *n;2253 2254 while (!RB_EMPTY_ROOT(&mdsc->pool_perm_tree)) {2255 n = rb_first(&mdsc->pool_perm_tree);2256 perm = rb_entry(n, struct ceph_pool_perm, node);2257 rb_erase(n, &mdsc->pool_perm_tree);2258 kfree(perm);2259 }2260}2261