#include #include #include #include #include #include /* generic_writepages */ #include #include #include #include "super.h" #include "mds_client.h" #include "cache.h" #include /* * Ceph address space ops. * * There are a few funny things going on here. * * The page->private field is used to reference a struct * ceph_snap_context for _every_ dirty page. This indicates which * snapshot the page was logically dirtied in, and thus which snap * context needs to be associated with the osd write during writeback. * * Similarly, struct ceph_inode_info maintains a set of counters to * count dirty pages on the inode. In the absence of snapshots, * i_wrbuffer_ref == i_wrbuffer_ref_head == the dirty page count. * * When a snapshot is taken (that is, when the client receives * notification that a snapshot was taken), each inode with caps and * with dirty pages (dirty pages implies there is a cap) gets a new * ceph_cap_snap in the i_cap_snaps list (which is sorted in ascending * order, new snaps go to the tail). The i_wrbuffer_ref_head count is * moved to capsnap->dirty. (Unless a sync write is currently in * progress. In that case, the capsnap is said to be "pending", new * writes cannot start, and the capsnap isn't "finalized" until the * write completes (or fails) and a final size/mtime for the inode for * that snap can be settled upon.) i_wrbuffer_ref_head is reset to 0. * * On writeback, we must submit writes to the osd IN SNAP ORDER. So, * we look for the first capsnap in i_cap_snaps and write out pages in * that snap context _only_. Then we move on to the next capsnap, * eventually reaching the "live" or "head" context (i.e., pages that * are not yet snapped) and are writing the most recently dirtied * pages. * * Invalidate and so forth must take care to ensure the dirty page * accounting is preserved. */ #define CONGESTION_ON_THRESH(congestion_kb) (congestion_kb >> (PAGE_SHIFT-10)) #define CONGESTION_OFF_THRESH(congestion_kb) \ (CONGESTION_ON_THRESH(congestion_kb) - \ (CONGESTION_ON_THRESH(congestion_kb) >> 2)) static inline struct ceph_snap_context *page_snap_context(struct page *page) { if (PagePrivate(page)) return (void *)page->private; return NULL; } /* * Dirty a page. Optimistically adjust accounting, on the assumption * that we won't race with invalidate. If we do, readjust. */ static int ceph_set_page_dirty(struct page *page) { struct address_space *mapping = page->mapping; struct inode *inode; struct ceph_inode_info *ci; struct ceph_snap_context *snapc; int ret; if (unlikely(!mapping)) return !TestSetPageDirty(page); if (PageDirty(page)) { dout("%p set_page_dirty %p idx %lu -- already dirty\n", mapping->host, page, page->index); BUG_ON(!PagePrivate(page)); return 0; } inode = mapping->host; ci = ceph_inode(inode); /* dirty the head */ spin_lock(&ci->i_ceph_lock); BUG_ON(ci->i_wr_ref == 0); // caller should hold Fw reference if (__ceph_have_pending_cap_snap(ci)) { struct ceph_cap_snap *capsnap = list_last_entry(&ci->i_cap_snaps, struct ceph_cap_snap, ci_item); snapc = ceph_get_snap_context(capsnap->context); capsnap->dirty_pages++; } else { BUG_ON(!ci->i_head_snapc); snapc = ceph_get_snap_context(ci->i_head_snapc); ++ci->i_wrbuffer_ref_head; } if (ci->i_wrbuffer_ref == 0) ihold(inode); ++ci->i_wrbuffer_ref; dout("%p set_page_dirty %p idx %lu head %d/%d -> %d/%d " "snapc %p seq %lld (%d snaps)\n", mapping->host, page, page->index, ci->i_wrbuffer_ref-1, ci->i_wrbuffer_ref_head-1, ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head, snapc, snapc->seq, snapc->num_snaps); spin_unlock(&ci->i_ceph_lock); /* * Reference snap context in page->private. Also set * PagePrivate so that we get invalidatepage callback. */ BUG_ON(PagePrivate(page)); page->private = (unsigned long)snapc; SetPagePrivate(page); ret = __set_page_dirty_nobuffers(page); WARN_ON(!PageLocked(page)); WARN_ON(!page->mapping); return ret; } /* * If we are truncating the full page (i.e. offset == 0), adjust the * dirty page counters appropriately. Only called if there is private * data on the page. */ static void ceph_invalidatepage(struct page *page, unsigned int offset, unsigned int length) { struct inode *inode; struct ceph_inode_info *ci; struct ceph_snap_context *snapc = page_snap_context(page); inode = page->mapping->host; ci = ceph_inode(inode); if (offset != 0 || length != PAGE_SIZE) { dout("%p invalidatepage %p idx %lu partial dirty page %u~%u\n", inode, page, page->index, offset, length); return; } ceph_invalidate_fscache_page(inode, page); if (!PagePrivate(page)) return; /* * We can get non-dirty pages here due to races between * set_page_dirty and truncate_complete_page; just spit out a * warning, in case we end up with accounting problems later. */ if (!PageDirty(page)) pr_err("%p invalidatepage %p page not dirty\n", inode, page); ClearPageChecked(page); dout("%p invalidatepage %p idx %lu full dirty page\n", inode, page, page->index); ceph_put_wrbuffer_cap_refs(ci, 1, snapc); ceph_put_snap_context(snapc); page->private = 0; ClearPagePrivate(page); } static int ceph_releasepage(struct page *page, gfp_t g) { dout("%p releasepage %p idx %lu (%sdirty)\n", page->mapping->host, page, page->index, PageDirty(page) ? "" : "not "); /* Can we release the page from the cache? */ if (!ceph_release_fscache_page(page, g)) return 0; return !PagePrivate(page); } /* * read a single page, without unlocking it. */ static int readpage_nounlock(struct file *filp, struct page *page) { struct inode *inode = file_inode(filp); struct ceph_inode_info *ci = ceph_inode(inode); struct ceph_osd_client *osdc = &ceph_inode_to_client(inode)->client->osdc; int err = 0; u64 off = page_offset(page); u64 len = PAGE_SIZE; if (off >= i_size_read(inode)) { zero_user_segment(page, 0, PAGE_SIZE); SetPageUptodate(page); return 0; } if (ci->i_inline_version != CEPH_INLINE_NONE) { /* * Uptodate inline data should have been added * into page cache while getting Fcr caps. */ if (off == 0) return -EINVAL; zero_user_segment(page, 0, PAGE_SIZE); SetPageUptodate(page); return 0; } err = ceph_readpage_from_fscache(inode, page); if (err == 0) goto out; dout("readpage inode %p file %p page %p index %lu\n", inode, filp, page, page->index); err = ceph_osdc_readpages(osdc, ceph_vino(inode), &ci->i_layout, off, &len, ci->i_truncate_seq, ci->i_truncate_size, &page, 1, 0); if (err == -ENOENT) err = 0; if (err < 0) { SetPageError(page); ceph_fscache_readpage_cancel(inode, page); goto out; } if (err < PAGE_SIZE) /* zero fill remainder of page */ zero_user_segment(page, err, PAGE_SIZE); else flush_dcache_page(page); SetPageUptodate(page); ceph_readpage_to_fscache(inode, page); out: return err < 0 ? err : 0; } static int ceph_readpage(struct file *filp, struct page *page) { int r = readpage_nounlock(filp, page); unlock_page(page); return r; } /* * Finish an async read(ahead) op. */ static void finish_read(struct ceph_osd_request *req) { struct inode *inode = req->r_inode; struct ceph_osd_data *osd_data; int rc = req->r_result <= 0 ? req->r_result : 0; int bytes = req->r_result >= 0 ? req->r_result : 0; int num_pages; int i; dout("finish_read %p req %p rc %d bytes %d\n", inode, req, rc, bytes); /* unlock all pages, zeroing any data we didn't read */ osd_data = osd_req_op_extent_osd_data(req, 0); BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES); num_pages = calc_pages_for((u64)osd_data->alignment, (u64)osd_data->length); for (i = 0; i < num_pages; i++) { struct page *page = osd_data->pages[i]; if (rc < 0 && rc != -ENOENT) { ceph_fscache_readpage_cancel(inode, page); goto unlock; } if (bytes < (int)PAGE_SIZE) { /* zero (remainder of) page */ int s = bytes < 0 ? 0 : bytes; zero_user_segment(page, s, PAGE_SIZE); } dout("finish_read %p uptodate %p idx %lu\n", inode, page, page->index); flush_dcache_page(page); SetPageUptodate(page); ceph_readpage_to_fscache(inode, page); unlock: unlock_page(page); put_page(page); bytes -= PAGE_SIZE; } kfree(osd_data->pages); } /* * start an async read(ahead) operation. return nr_pages we submitted * a read for on success, or negative error code. */ static int start_read(struct inode *inode, struct list_head *page_list, int max) { struct ceph_osd_client *osdc = &ceph_inode_to_client(inode)->client->osdc; struct ceph_inode_info *ci = ceph_inode(inode); struct page *page = list_entry(page_list->prev, struct page, lru); struct ceph_vino vino; struct ceph_osd_request *req; u64 off; u64 len; int i; struct page **pages; pgoff_t next_index; int nr_pages = 0; int got = 0; int ret = 0; if (!current->journal_info) { /* caller of readpages does not hold buffer and read caps * (fadvise, madvise and readahead cases) */ int want = CEPH_CAP_FILE_CACHE; ret = ceph_try_get_caps(ci, CEPH_CAP_FILE_RD, want, &got); if (ret < 0) { dout("start_read %p, error getting cap\n", inode); } else if (!(got & want)) { dout("start_read %p, no cache cap\n", inode); ret = 0; } if (ret <= 0) { if (got) ceph_put_cap_refs(ci, got); while (!list_empty(page_list)) { page = list_entry(page_list->prev, struct page, lru); list_del(&page->lru); put_page(page); } return ret; } } off = (u64) page_offset(page); /* count pages */ next_index = page->index; list_for_each_entry_reverse(page, page_list, lru) { if (page->index != next_index) break; nr_pages++; next_index++; if (max && nr_pages == max) break; } len = nr_pages << PAGE_SHIFT; dout("start_read %p nr_pages %d is %lld~%lld\n", inode, nr_pages, off, len); vino = ceph_vino(inode); req = ceph_osdc_new_request(osdc, &ci->i_layout, vino, off, &len, 0, 1, CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ, NULL, ci->i_truncate_seq, ci->i_truncate_size, false); if (IS_ERR(req)) { ret = PTR_ERR(req); goto out; } /* build page vector */ nr_pages = calc_pages_for(0, len); pages = kmalloc(sizeof(*pages) * nr_pages, GFP_KERNEL); if (!pages) { ret = -ENOMEM; goto out_put; } for (i = 0; i < nr_pages; ++i) { page = list_entry(page_list->prev, struct page, lru); BUG_ON(PageLocked(page)); list_del(&page->lru); dout("start_read %p adding %p idx %lu\n", inode, page, page->index); if (add_to_page_cache_lru(page, &inode->i_data, page->index, GFP_KERNEL)) { ceph_fscache_uncache_page(inode, page); put_page(page); dout("start_read %p add_to_page_cache failed %p\n", inode, page); nr_pages = i; if (nr_pages > 0) { len = nr_pages << PAGE_SHIFT; break; } goto out_pages; } pages[i] = page; } osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, false, false); req->r_callback = finish_read; req->r_inode = inode; dout("start_read %p starting %p %lld~%lld\n", inode, req, off, len); ret = ceph_osdc_start_request(osdc, req, false); if (ret < 0) goto out_pages; ceph_osdc_put_request(req); /* After adding locked pages to page cache, the inode holds cache cap. * So we can drop our cap refs. */ if (got) ceph_put_cap_refs(ci, got); return nr_pages; out_pages: for (i = 0; i < nr_pages; ++i) { ceph_fscache_readpage_cancel(inode, pages[i]); unlock_page(pages[i]); } ceph_put_page_vector(pages, nr_pages, false); out_put: ceph_osdc_put_request(req); out: if (got) ceph_put_cap_refs(ci, got); return ret; } /* * Read multiple pages. Leave pages we don't read + unlock in page_list; * the caller (VM) cleans them up. */ static int ceph_readpages(struct file *file, struct address_space *mapping, struct list_head *page_list, unsigned nr_pages) { struct inode *inode = file_inode(file); struct ceph_fs_client *fsc = ceph_inode_to_client(inode); int rc = 0; int max = 0; if (ceph_inode(inode)->i_inline_version != CEPH_INLINE_NONE) return -EINVAL; rc = ceph_readpages_from_fscache(mapping->host, mapping, page_list, &nr_pages); if (rc == 0) goto out; if (fsc->mount_options->rsize >= PAGE_SIZE) max = (fsc->mount_options->rsize + PAGE_SIZE - 1) >> PAGE_SHIFT; dout("readpages %p file %p nr_pages %d max %d\n", inode, file, nr_pages, max); while (!list_empty(page_list)) { rc = start_read(inode, page_list, max); if (rc < 0) goto out; } out: ceph_fscache_readpages_cancel(inode, page_list); dout("readpages %p file %p ret %d\n", inode, file, rc); return rc; } /* * Get ref for the oldest snapc for an inode with dirty data... that is, the * only snap context we are allowed to write back. */ static struct ceph_snap_context *get_oldest_context(struct inode *inode, loff_t *snap_size) { struct ceph_inode_info *ci = ceph_inode(inode); struct ceph_snap_context *snapc = NULL; struct ceph_cap_snap *capsnap = NULL; spin_lock(&ci->i_ceph_lock); list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { dout(" cap_snap %p snapc %p has %d dirty pages\n", capsnap, capsnap->context, capsnap->dirty_pages); if (capsnap->dirty_pages) { snapc = ceph_get_snap_context(capsnap->context); if (snap_size) *snap_size = capsnap->size; break; } } if (!snapc && ci->i_wrbuffer_ref_head) { snapc = ceph_get_snap_context(ci->i_head_snapc); dout(" head snapc %p has %d dirty pages\n", snapc, ci->i_wrbuffer_ref_head); } spin_unlock(&ci->i_ceph_lock); return snapc; } /* * Write a single page, but leave the page locked. * * If we get a write error, set the page error bit, but still adjust the * dirty page accounting (i.e., page is no longer dirty). */ static int writepage_nounlock(struct page *page, struct writeback_control *wbc) { struct inode *inode; struct ceph_inode_info *ci; struct ceph_fs_client *fsc; struct ceph_osd_client *osdc; struct ceph_snap_context *snapc, *oldest; loff_t page_off = page_offset(page); loff_t snap_size = -1; long writeback_stat; u64 truncate_size; u32 truncate_seq; int err = 0, len = PAGE_SIZE; dout("writepage %p idx %lu\n", page, page->index); if (!page->mapping || !page->mapping->host) { dout("writepage %p - no mapping\n", page); return -EFAULT; } inode = page->mapping->host; ci = ceph_inode(inode); fsc = ceph_inode_to_client(inode); osdc = &fsc->client->osdc; /* verify this is a writeable snap context */ snapc = page_snap_context(page); if (snapc == NULL) { dout("writepage %p page %p not dirty?\n", inode, page); goto out; } oldest = get_oldest_context(inode, &snap_size); if (snapc->seq > oldest->seq) { dout("writepage %p page %p snapc %p not writeable - noop\n", inode, page, snapc); /* we should only noop if called by kswapd */ WARN_ON((current->flags & PF_MEMALLOC) == 0); ceph_put_snap_context(oldest); goto out; } ceph_put_snap_context(oldest); spin_lock(&ci->i_ceph_lock); truncate_seq = ci->i_truncate_seq; truncate_size = ci->i_truncate_size; if (snap_size == -1) snap_size = i_size_read(inode); spin_unlock(&ci->i_ceph_lock); /* is this a partial page at end of file? */ if (page_off >= snap_size) { dout("%p page eof %llu\n", page, snap_size); goto out; } if (snap_size < page_off + len) len = snap_size - page_off; dout("writepage %p page %p index %lu on %llu~%u snapc %p\n", inode, page, page->index, page_off, len, snapc); writeback_stat = atomic_long_inc_return(&fsc->writeback_count); if (writeback_stat > CONGESTION_ON_THRESH(fsc->mount_options->congestion_kb)) set_bdi_congested(&fsc->backing_dev_info, BLK_RW_ASYNC); set_page_writeback(page); err = ceph_osdc_writepages(osdc, ceph_vino(inode), &ci->i_layout, snapc, page_off, len, truncate_seq, truncate_size, &inode->i_mtime, &page, 1); if (err < 0) { struct writeback_control tmp_wbc; if (!wbc) wbc = &tmp_wbc; if (err == -ERESTARTSYS) { /* killed by SIGKILL */ dout("writepage interrupted page %p\n", page); redirty_page_for_writepage(wbc, page); end_page_writeback(page); goto out; } dout("writepage setting page/mapping error %d %p\n", err, page); SetPageError(page); mapping_set_error(&inode->i_data, err); wbc->pages_skipped++; } else { dout("writepage cleaned page %p\n", page); err = 0; /* vfs expects us to return 0 */ } page->private = 0; ClearPagePrivate(page); end_page_writeback(page); ceph_put_wrbuffer_cap_refs(ci, 1, snapc); ceph_put_snap_context(snapc); /* page's reference */ out: return err; } static int ceph_writepage(struct page *page, struct writeback_control *wbc) { int err; struct inode *inode = page->mapping->host; BUG_ON(!inode); ihold(inode); err = writepage_nounlock(page, wbc); if (err == -ERESTARTSYS) { /* direct memory reclaimer was killed by SIGKILL. return 0 * to prevent caller from setting mapping/page error */ err = 0; } unlock_page(page); iput(inode); return err; } /* * lame release_pages helper. release_pages() isn't exported to * modules. */ static void ceph_release_pages(struct page **pages, int num) { struct pagevec pvec; int i; pagevec_init(&pvec, 0); for (i = 0; i < num; i++) { if (pagevec_add(&pvec, pages[i]) == 0) pagevec_release(&pvec); } pagevec_release(&pvec); } /* * async writeback completion handler. * * If we get an error, set the mapping error bit, but not the individual * page error bits. */ static void writepages_finish(struct ceph_osd_request *req) { struct inode *inode = req->r_inode; struct ceph_inode_info *ci = ceph_inode(inode); struct ceph_osd_data *osd_data; struct page *page; int num_pages, total_pages = 0; int i, j; int rc = req->r_result; struct ceph_snap_context *snapc = req->r_snapc; struct address_space *mapping = inode->i_mapping; struct ceph_fs_client *fsc = ceph_inode_to_client(inode); bool remove_page; dout("writepages_finish %p rc %d\n", inode, rc); if (rc < 0) mapping_set_error(mapping, rc); /* * We lost the cache cap, need to truncate the page before * it is unlocked, otherwise we'd truncate it later in the * page truncation thread, possibly losing some data that * raced its way in */ remove_page = !(ceph_caps_issued(ci) & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)); /* clean all pages */ for (i = 0; i < req->r_num_ops; i++) { if (req->r_ops[i].op != CEPH_OSD_OP_WRITE) break; osd_data = osd_req_op_extent_osd_data(req, i); BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES); num_pages = calc_pages_for((u64)osd_data->alignment, (u64)osd_data->length); total_pages += num_pages; for (j = 0; j < num_pages; j++) { page = osd_data->pages[j]; BUG_ON(!page); WARN_ON(!PageUptodate(page)); if (atomic_long_dec_return(&fsc->writeback_count) < CONGESTION_OFF_THRESH( fsc->mount_options->congestion_kb)) clear_bdi_congested(&fsc->backing_dev_info, BLK_RW_ASYNC); if (rc < 0) SetPageError(page); ceph_put_snap_context(page_snap_context(page)); page->private = 0; ClearPagePrivate(page); dout("unlocking %p\n", page); end_page_writeback(page); if (remove_page) generic_error_remove_page(inode->i_mapping, page); unlock_page(page); } dout("writepages_finish %p wrote %llu bytes cleaned %d pages\n", inode, osd_data->length, rc >= 0 ? num_pages : 0); ceph_release_pages(osd_data->pages, num_pages); } ceph_put_wrbuffer_cap_refs(ci, total_pages, snapc); osd_data = osd_req_op_extent_osd_data(req, 0); if (osd_data->pages_from_pool) mempool_free(osd_data->pages, ceph_sb_to_client(inode->i_sb)->wb_pagevec_pool); else kfree(osd_data->pages); ceph_osdc_put_request(req); } /* * initiate async writeback */ static int ceph_writepages_start(struct address_space *mapping, struct writeback_control *wbc) { struct inode *inode = mapping->host; struct ceph_inode_info *ci = ceph_inode(inode); struct ceph_fs_client *fsc = ceph_inode_to_client(inode); struct ceph_vino vino = ceph_vino(inode); pgoff_t index, start, end; int range_whole = 0; int should_loop = 1; pgoff_t max_pages = 0, max_pages_ever = 0; struct ceph_snap_context *snapc = NULL, *last_snapc = NULL, *pgsnapc; struct pagevec pvec; int done = 0; int rc = 0; unsigned wsize = 1 << inode->i_blkbits; struct ceph_osd_request *req = NULL; int do_sync = 0; loff_t snap_size, i_size; u64 truncate_size; u32 truncate_seq; /* * Include a 'sync' in the OSD request if this is a data * integrity write (e.g., O_SYNC write or fsync()), or if our * cap is being revoked. */ if ((wbc->sync_mode == WB_SYNC_ALL) || ceph_caps_revoking(ci, CEPH_CAP_FILE_BUFFER)) do_sync = 1; dout("writepages_start %p dosync=%d (mode=%s)\n", inode, do_sync, wbc->sync_mode == WB_SYNC_NONE ? "NONE" : (wbc->sync_mode == WB_SYNC_ALL ? "ALL" : "HOLD")); if (ACCESS_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) { if (ci->i_wrbuffer_ref > 0) { pr_warn_ratelimited( "writepage_start %p %lld forced umount\n", inode, ceph_ino(inode)); } mapping_set_error(mapping, -EIO); return -EIO; /* we're in a forced umount, don't write! */ } if (fsc->mount_options->wsize && fsc->mount_options->wsize < wsize) wsize = fsc->mount_options->wsize; if (wsize < PAGE_SIZE) wsize = PAGE_SIZE; max_pages_ever = wsize >> PAGE_SHIFT; pagevec_init(&pvec, 0); /* where to start/end? */ if (wbc->range_cyclic) { start = mapping->writeback_index; /* Start from prev offset */ end = -1; dout(" cyclic, start at %lu\n", start); } else { start = wbc->range_start >> PAGE_SHIFT; end = wbc->range_end >> PAGE_SHIFT; if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) range_whole = 1; should_loop = 0; dout(" not cyclic, %lu to %lu\n", start, end); } index = start; retry: /* find oldest snap context with dirty data */ ceph_put_snap_context(snapc); snap_size = -1; snapc = get_oldest_context(inode, &snap_size); if (!snapc) { /* hmm, why does writepages get called when there is no dirty data? */ dout(" no snap context with dirty data?\n"); goto out; } dout(" oldest snapc is %p seq %lld (%d snaps)\n", snapc, snapc->seq, snapc->num_snaps); spin_lock(&ci->i_ceph_lock); truncate_seq = ci->i_truncate_seq; truncate_size = ci->i_truncate_size; i_size = i_size_read(inode); spin_unlock(&ci->i_ceph_lock); if (last_snapc && snapc != last_snapc) { /* if we switched to a newer snapc, restart our scan at the * start of the original file range. */ dout(" snapc differs from last pass, restarting at %lu\n", index); index = start; } last_snapc = snapc; while (!done && index <= end) { unsigned i; int first; pgoff_t strip_unit_end = 0; int num_ops = 0, op_idx; int pvec_pages, locked_pages = 0; struct page **pages = NULL, **data_pages; mempool_t *pool = NULL; /* Becomes non-null if mempool used */ struct page *page; int want; u64 offset = 0, len = 0; max_pages = max_pages_ever; get_more_pages: first = -1; want = min(end - index, min((pgoff_t)PAGEVEC_SIZE, max_pages - (pgoff_t)locked_pages) - 1) + 1; pvec_pages = pagevec_lookup_tag(&pvec, mapping, &index, PAGECACHE_TAG_DIRTY, want); dout("pagevec_lookup_tag got %d\n", pvec_pages); if (!pvec_pages && !locked_pages) break; for (i = 0; i < pvec_pages && locked_pages < max_pages; i++) { page = pvec.pages[i]; dout("? %p idx %lu\n", page, page->index); if (locked_pages == 0) lock_page(page); /* first page */ else if (!trylock_page(page)) break; /* only dirty pages, or our accounting breaks */ if (unlikely(!PageDirty(page)) || unlikely(page->mapping != mapping)) { dout("!dirty or !mapping %p\n", page); unlock_page(page); break; } if (!wbc->range_cyclic && page->index > end) { dout("end of range %p\n", page); done = 1; unlock_page(page); break; } if (strip_unit_end && (page->index > strip_unit_end)) { dout("end of strip unit %p\n", page); unlock_page(page); break; } if (wbc->sync_mode != WB_SYNC_NONE) { dout("waiting on writeback %p\n", page); wait_on_page_writeback(page); } if (page_offset(page) >= (snap_size == -1 ? i_size : snap_size)) { dout("%p page eof %llu\n", page, (snap_size == -1 ? i_size : snap_size)); done = 1; unlock_page(page); break; } if (PageWriteback(page)) { dout("%p under writeback\n", page); unlock_page(page); break; } /* only if matching snap context */ pgsnapc = page_snap_context(page); if (pgsnapc->seq > snapc->seq) { dout("page snapc %p %lld > oldest %p %lld\n", pgsnapc, pgsnapc->seq, snapc, snapc->seq); unlock_page(page); if (!locked_pages) continue; /* keep looking for snap */ break; } if (!clear_page_dirty_for_io(page)) { dout("%p !clear_page_dirty_for_io\n", page); unlock_page(page); break; } /* * We have something to write. If this is * the first locked page this time through, * calculate max possinle write size and * allocate a page array */ if (locked_pages == 0) { u64 objnum; u64 objoff; /* prepare async write request */ offset = (u64)page_offset(page); len = wsize; rc = ceph_calc_file_object_mapping(&ci->i_layout, offset, len, &objnum, &objoff, &len); if (rc < 0) { unlock_page(page); break; } num_ops = 1 + do_sync; strip_unit_end = page->index + ((len - 1) >> PAGE_SHIFT); BUG_ON(pages); max_pages = calc_pages_for(0, (u64)len); pages = kmalloc(max_pages * sizeof (*pages), GFP_NOFS); if (!pages) { pool = fsc->wb_pagevec_pool; pages = mempool_alloc(pool, GFP_NOFS); BUG_ON(!pages); } len = 0; } else if (page->index != (offset + len) >> PAGE_SHIFT) { if (num_ops >= (pool ? CEPH_OSD_SLAB_OPS : CEPH_OSD_MAX_OPS)) { redirty_page_for_writepage(wbc, page); unlock_page(page); break; } num_ops++; offset = (u64)page_offset(page); len = 0; } /* note position of first page in pvec */ if (first < 0) first = i; dout("%p will write page %p idx %lu\n", inode, page, page->index); if (atomic_long_inc_return(&fsc->writeback_count) > CONGESTION_ON_THRESH( fsc->mount_options->congestion_kb)) { set_bdi_congested(&fsc->backing_dev_info, BLK_RW_ASYNC); } pages[locked_pages] = page; locked_pages++; len += PAGE_SIZE; } /* did we get anything? */ if (!locked_pages) goto release_pvec_pages; if (i) { int j; BUG_ON(!locked_pages || first < 0); if (pvec_pages && i == pvec_pages && locked_pages < max_pages) { dout("reached end pvec, trying for more\n"); pagevec_reinit(&pvec); goto get_more_pages; } /* shift unused pages over in the pvec... we * will need to release them below. */ for (j = i; j < pvec_pages; j++) { dout(" pvec leftover page %p\n", pvec.pages[j]); pvec.pages[j-i+first] = pvec.pages[j]; } pvec.nr -= i-first; } new_request: offset = page_offset(pages[0]); len = wsize; req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, vino, offset, &len, 0, num_ops, CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, snapc, truncate_seq, truncate_size, false); if (IS_ERR(req)) { req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, vino, offset, &len, 0, min(num_ops, CEPH_OSD_SLAB_OPS), CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, snapc, truncate_seq, truncate_size, true); BUG_ON(IS_ERR(req)); } BUG_ON(len < page_offset(pages[locked_pages - 1]) + PAGE_SIZE - offset); req->r_callback = writepages_finish; req->r_inode = inode; /* Format the osd request message and submit the write */ len = 0; data_pages = pages; op_idx = 0; for (i = 0; i < locked_pages; i++) { u64 cur_offset = page_offset(pages[i]); if (offset + len != cur_offset) { if (op_idx + do_sync + 1 == req->r_num_ops) break; osd_req_op_extent_dup_last(req, op_idx, cur_offset - offset); dout("writepages got pages at %llu~%llu\n", offset, len); osd_req_op_extent_osd_data_pages(req, op_idx, data_pages, len, 0, !!pool, false); osd_req_op_extent_update(req, op_idx, len); len = 0; offset = cur_offset; data_pages = pages + i; op_idx++; } set_page_writeback(pages[i]); len += PAGE_SIZE; } if (snap_size != -1) { len = min(len, snap_size - offset); } else if (i == locked_pages) { /* writepages_finish() clears writeback pages * according to the data length, so make sure * data length covers all locked pages */ u64 min_len = len + 1 - PAGE_SIZE; len = min(len, (u64)i_size_read(inode) - offset); len = max(len, min_len); } dout("writepages got pages at %llu~%llu\n", offset, len); osd_req_op_extent_osd_data_pages(req, op_idx, data_pages, len, 0, !!pool, false); osd_req_op_extent_update(req, op_idx, len); if (do_sync) { op_idx++; osd_req_op_init(req, op_idx, CEPH_OSD_OP_STARTSYNC, 0); } BUG_ON(op_idx + 1 != req->r_num_ops); pool = NULL; if (i < locked_pages) { BUG_ON(num_ops <= req->r_num_ops); num_ops -= req->r_num_ops; num_ops += do_sync; locked_pages -= i; /* allocate new pages array for next request */ data_pages = pages; pages = kmalloc(locked_pages * sizeof (*pages), GFP_NOFS); if (!pages) { pool = fsc->wb_pagevec_pool; pages = mempool_alloc(pool, GFP_NOFS); BUG_ON(!pages); } memcpy(pages, data_pages + i, locked_pages * sizeof(*pages)); memset(data_pages + i, 0, locked_pages * sizeof(*pages)); } else { BUG_ON(num_ops != req->r_num_ops); index = pages[i - 1]->index + 1; /* request message now owns the pages array */ pages = NULL; } req->r_mtime = inode->i_mtime; rc = ceph_osdc_start_request(&fsc->client->osdc, req, true); BUG_ON(rc); req = NULL; wbc->nr_to_write -= i; if (pages) goto new_request; if (wbc->nr_to_write <= 0) done = 1; release_pvec_pages: dout("pagevec_release on %d pages (%p)\n", (int)pvec.nr, pvec.nr ? pvec.pages[0] : NULL); pagevec_release(&pvec); if (locked_pages && !done) goto retry; } if (should_loop && !done) { /* more to do; loop back to beginning of file */ dout("writepages looping back to beginning of file\n"); should_loop = 0; index = 0; goto retry; } if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) mapping->writeback_index = index; out: ceph_osdc_put_request(req); ceph_put_snap_context(snapc); dout("writepages done, rc = %d\n", rc); return rc; } /* * See if a given @snapc is either writeable, or already written. */ static int context_is_writeable_or_written(struct inode *inode, struct ceph_snap_context *snapc) { struct ceph_snap_context *oldest = get_oldest_context(inode, NULL); int ret = !oldest || snapc->seq <= oldest->seq; ceph_put_snap_context(oldest); return ret; } /* * We are only allowed to write into/dirty the page if the page is * clean, or already dirty within the same snap context. * * called with page locked. * return success with page locked, * or any failure (incl -EAGAIN) with page unlocked. */ static int ceph_update_writeable_page(struct file *file, loff_t pos, unsigned len, struct page *page) { struct inode *inode = file_inode(file); struct ceph_fs_client *fsc = ceph_inode_to_client(inode); struct ceph_inode_info *ci = ceph_inode(inode); loff_t page_off = pos & PAGE_MASK; int pos_in_page = pos & ~PAGE_MASK; int end_in_page = pos_in_page + len; loff_t i_size; int r; struct ceph_snap_context *snapc, *oldest; if (ACCESS_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) { dout(" page %p forced umount\n", page); unlock_page(page); return -EIO; } retry_locked: /* writepages currently holds page lock, but if we change that later, */ wait_on_page_writeback(page); snapc = page_snap_context(page); if (snapc && snapc != ci->i_head_snapc) { /* * this page is already dirty in another (older) snap * context! is it writeable now? */ oldest = get_oldest_context(inode, NULL); if (snapc->seq > oldest->seq) { ceph_put_snap_context(oldest); dout(" page %p snapc %p not current or oldest\n", page, snapc); /* * queue for writeback, and wait for snapc to * be writeable or written */ snapc = ceph_get_snap_context(snapc); unlock_page(page); ceph_queue_writeback(inode); r = wait_event_killable(ci->i_cap_wq, context_is_writeable_or_written(inode, snapc)); ceph_put_snap_context(snapc); if (r == -ERESTARTSYS) return r; return -EAGAIN; } ceph_put_snap_context(oldest); /* yay, writeable, do it now (without dropping page lock) */ dout(" page %p snapc %p not current, but oldest\n", page, snapc); if (!clear_page_dirty_for_io(page)) goto retry_locked; r = writepage_nounlock(page, NULL); if (r < 0) goto fail_nosnap; goto retry_locked; } if (PageUptodate(page)) { dout(" page %p already uptodate\n", page); return 0; } /* full page? */ if (pos_in_page == 0 && len == PAGE_SIZE) return 0; /* past end of file? */ i_size = i_size_read(inode); if (page_off >= i_size || (pos_in_page == 0 && (pos+len) >= i_size && end_in_page - pos_in_page != PAGE_SIZE)) { dout(" zeroing %p 0 - %d and %d - %d\n", page, pos_in_page, end_in_page, (int)PAGE_SIZE); zero_user_segments(page, 0, pos_in_page, end_in_page, PAGE_SIZE); return 0; } /* we need to read it. */ r = readpage_nounlock(file, page); if (r < 0) goto fail_nosnap; goto retry_locked; fail_nosnap: unlock_page(page); return r; } /* * We are only allowed to write into/dirty the page if the page is * clean, or already dirty within the same snap context. */ static int ceph_write_begin(struct file *file, struct address_space *mapping, loff_t pos, unsigned len, unsigned flags, struct page **pagep, void **fsdata) { struct inode *inode = file_inode(file); struct page *page; pgoff_t index = pos >> PAGE_SHIFT; int r; do { /* get a page */ page = grab_cache_page_write_begin(mapping, index, 0); if (!page) return -ENOMEM; dout("write_begin file %p inode %p page %p %d~%d\n", file, inode, page, (int)pos, (int)len); r = ceph_update_writeable_page(file, pos, len, page); if (r < 0) put_page(page); else *pagep = page; } while (r == -EAGAIN); return r; } /* * we don't do anything in here that simple_write_end doesn't do * except adjust dirty page accounting */ static int ceph_write_end(struct file *file, struct address_space *mapping, loff_t pos, unsigned len, unsigned copied, struct page *page, void *fsdata) { struct inode *inode = file_inode(file); unsigned from = pos & (PAGE_SIZE - 1); int check_cap = 0; dout("write_end file %p inode %p page %p %d~%d (%d)\n", file, inode, page, (int)pos, (int)copied, (int)len); /* zero the stale part of the page if we did a short copy */ if (copied < len) zero_user_segment(page, from+copied, len); /* did file size increase? */ if (pos+copied > i_size_read(inode)) check_cap = ceph_inode_set_size(inode, pos+copied); if (!PageUptodate(page)) SetPageUptodate(page); set_page_dirty(page); unlock_page(page); put_page(page); if (check_cap) ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY, NULL); return copied; } /* * we set .direct_IO to indicate direct io is supported, but since we * intercept O_DIRECT reads and writes early, this function should * never get called. */ static ssize_t ceph_direct_io(struct kiocb *iocb, struct iov_iter *iter) { WARN_ON(1); return -EINVAL; } const struct address_space_operations ceph_aops = { .readpage = ceph_readpage, .readpages = ceph_readpages, .writepage = ceph_writepage, .writepages = ceph_writepages_start, .write_begin = ceph_write_begin, .write_end = ceph_write_end, .set_page_dirty = ceph_set_page_dirty, .invalidatepage = ceph_invalidatepage, .releasepage = ceph_releasepage, .direct_IO = ceph_direct_io, }; static void ceph_block_sigs(sigset_t *oldset) { sigset_t mask; siginitsetinv(&mask, sigmask(SIGKILL)); sigprocmask(SIG_BLOCK, &mask, oldset); } static void ceph_restore_sigs(sigset_t *oldset) { sigprocmask(SIG_SETMASK, oldset, NULL); } /* * vm ops */ static int ceph_filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf) { struct inode *inode = file_inode(vma->vm_file); struct ceph_inode_info *ci = ceph_inode(inode); struct ceph_file_info *fi = vma->vm_file->private_data; struct page *pinned_page = NULL; loff_t off = vmf->pgoff << PAGE_SHIFT; int want, got, ret; sigset_t oldset; ceph_block_sigs(&oldset); dout("filemap_fault %p %llx.%llx %llu~%zd trying to get caps\n", inode, ceph_vinop(inode), off, (size_t)PAGE_SIZE); if (fi->fmode & CEPH_FILE_MODE_LAZY) want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO; else want = CEPH_CAP_FILE_CACHE; got = 0; ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, -1, &got, &pinned_page); if (ret < 0) goto out_restore; dout("filemap_fault %p %llu~%zd got cap refs on %s\n", inode, off, (size_t)PAGE_SIZE, ceph_cap_string(got)); if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) || ci->i_inline_version == CEPH_INLINE_NONE) { current->journal_info = vma->vm_file; ret = filemap_fault(vma, vmf); current->journal_info = NULL; } else ret = -EAGAIN; dout("filemap_fault %p %llu~%zd dropping cap refs on %s ret %d\n", inode, off, (size_t)PAGE_SIZE, ceph_cap_string(got), ret); if (pinned_page) put_page(pinned_page); ceph_put_cap_refs(ci, got); if (ret != -EAGAIN) goto out_restore; /* read inline data */ if (off >= PAGE_SIZE) { /* does not support inline data > PAGE_SIZE */ ret = VM_FAULT_SIGBUS; } else { int ret1; struct address_space *mapping = inode->i_mapping; struct page *page = find_or_create_page(mapping, 0, mapping_gfp_constraint(mapping, ~__GFP_FS)); if (!page) { ret = VM_FAULT_OOM; goto out_inline; } ret1 = __ceph_do_getattr(inode, page, CEPH_STAT_CAP_INLINE_DATA, true); if (ret1 < 0 || off >= i_size_read(inode)) { unlock_page(page); put_page(page); if (ret1 < 0) ret = ret1; else ret = VM_FAULT_SIGBUS; goto out_inline; } if (ret1 < PAGE_SIZE) zero_user_segment(page, ret1, PAGE_SIZE); else flush_dcache_page(page); SetPageUptodate(page); vmf->page = page; ret = VM_FAULT_MAJOR | VM_FAULT_LOCKED; out_inline: dout("filemap_fault %p %llu~%zd read inline data ret %d\n", inode, off, (size_t)PAGE_SIZE, ret); } out_restore: ceph_restore_sigs(&oldset); if (ret < 0) ret = (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS; return ret; } /* * Reuse write_begin here for simplicity. */ static int ceph_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) { struct inode *inode = file_inode(vma->vm_file); struct ceph_inode_info *ci = ceph_inode(inode); struct ceph_file_info *fi = vma->vm_file->private_data; struct ceph_cap_flush *prealloc_cf; struct page *page = vmf->page; loff_t off = page_offset(page); loff_t size = i_size_read(inode); size_t len; int want, got, ret; sigset_t oldset; prealloc_cf = ceph_alloc_cap_flush(); if (!prealloc_cf) return VM_FAULT_OOM; ceph_block_sigs(&oldset); if (ci->i_inline_version != CEPH_INLINE_NONE) { struct page *locked_page = NULL; if (off == 0) { lock_page(page); locked_page = page; } ret = ceph_uninline_data(vma->vm_file, locked_page); if (locked_page) unlock_page(locked_page); if (ret < 0) goto out_free; } if (off + PAGE_SIZE <= size) len = PAGE_SIZE; else len = size & ~PAGE_MASK; dout("page_mkwrite %p %llx.%llx %llu~%zd getting caps i_size %llu\n", inode, ceph_vinop(inode), off, len, size); if (fi->fmode & CEPH_FILE_MODE_LAZY) want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; else want = CEPH_CAP_FILE_BUFFER; got = 0; ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, off + len, &got, NULL); if (ret < 0) goto out_free; dout("page_mkwrite %p %llu~%zd got cap refs on %s\n", inode, off, len, ceph_cap_string(got)); /* Update time before taking page lock */ file_update_time(vma->vm_file); do { lock_page(page); if ((off > size) || (page->mapping != inode->i_mapping)) { unlock_page(page); ret = VM_FAULT_NOPAGE; break; } ret = ceph_update_writeable_page(vma->vm_file, off, len, page); if (ret >= 0) { /* success. we'll keep the page locked. */ set_page_dirty(page); ret = VM_FAULT_LOCKED; } } while (ret == -EAGAIN); if (ret == VM_FAULT_LOCKED || ci->i_inline_version != CEPH_INLINE_NONE) { int dirty; spin_lock(&ci->i_ceph_lock); ci->i_inline_version = CEPH_INLINE_NONE; dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR, &prealloc_cf); spin_unlock(&ci->i_ceph_lock); if (dirty) __mark_inode_dirty(inode, dirty); } dout("page_mkwrite %p %llu~%zd dropping cap refs on %s ret %d\n", inode, off, len, ceph_cap_string(got), ret); ceph_put_cap_refs(ci, got); out_free: ceph_restore_sigs(&oldset); ceph_free_cap_flush(prealloc_cf); if (ret < 0) ret = (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS; return ret; } void ceph_fill_inline_data(struct inode *inode, struct page *locked_page, char *data, size_t len) { struct address_space *mapping = inode->i_mapping; struct page *page; if (locked_page) { page = locked_page; } else { if (i_size_read(inode) == 0) return; page = find_or_create_page(mapping, 0, mapping_gfp_constraint(mapping, ~__GFP_FS)); if (!page) return; if (PageUptodate(page)) { unlock_page(page); put_page(page); return; } } dout("fill_inline_data %p %llx.%llx len %zu locked_page %p\n", inode, ceph_vinop(inode), len, locked_page); if (len > 0) { void *kaddr = kmap_atomic(page); memcpy(kaddr, data, len); kunmap_atomic(kaddr); } if (page != locked_page) { if (len < PAGE_SIZE) zero_user_segment(page, len, PAGE_SIZE); else flush_dcache_page(page); SetPageUptodate(page); unlock_page(page); put_page(page); } } int ceph_uninline_data(struct file *filp, struct page *locked_page) { struct inode *inode = file_inode(filp); struct ceph_inode_info *ci = ceph_inode(inode); struct ceph_fs_client *fsc = ceph_inode_to_client(inode); struct ceph_osd_request *req; struct page *page = NULL; u64 len, inline_version; int err = 0; bool from_pagecache = false; spin_lock(&ci->i_ceph_lock); inline_version = ci->i_inline_version; spin_unlock(&ci->i_ceph_lock); dout("uninline_data %p %llx.%llx inline_version %llu\n", inode, ceph_vinop(inode), inline_version); if (inline_version == 1 || /* initial version, no data */ inline_version == CEPH_INLINE_NONE) goto out; if (locked_page) { page = locked_page; WARN_ON(!PageUptodate(page)); } else if (ceph_caps_issued(ci) & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) { page = find_get_page(inode->i_mapping, 0); if (page) { if (PageUptodate(page)) { from_pagecache = true; lock_page(page); } else { put_page(page); page = NULL; } } } if (page) { len = i_size_read(inode); if (len > PAGE_SIZE) len = PAGE_SIZE; } else { page = __page_cache_alloc(GFP_NOFS); if (!page) { err = -ENOMEM; goto out; } err = __ceph_do_getattr(inode, page, CEPH_STAT_CAP_INLINE_DATA, true); if (err < 0) { /* no inline data */ if (err == -ENODATA) err = 0; goto out; } len = err; } req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, ceph_vino(inode), 0, &len, 0, 1, CEPH_OSD_OP_CREATE, CEPH_OSD_FLAG_ONDISK | CEPH_OSD_FLAG_WRITE, NULL, 0, 0, false); if (IS_ERR(req)) { err = PTR_ERR(req); goto out; } req->r_mtime = inode->i_mtime; err = ceph_osdc_start_request(&fsc->client->osdc, req, false); if (!err) err = ceph_osdc_wait_request(&fsc->client->osdc, req); ceph_osdc_put_request(req); if (err < 0) goto out; req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, ceph_vino(inode), 0, &len, 1, 3, CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_ONDISK | CEPH_OSD_FLAG_WRITE, NULL, ci->i_truncate_seq, ci->i_truncate_size, false); if (IS_ERR(req)) { err = PTR_ERR(req); goto out; } osd_req_op_extent_osd_data_pages(req, 1, &page, len, 0, false, false); { __le64 xattr_buf = cpu_to_le64(inline_version); err = osd_req_op_xattr_init(req, 0, CEPH_OSD_OP_CMPXATTR, "inline_version", &xattr_buf, sizeof(xattr_buf), CEPH_OSD_CMPXATTR_OP_GT, CEPH_OSD_CMPXATTR_MODE_U64); if (err) goto out_put; } { char xattr_buf[32]; int xattr_len = snprintf(xattr_buf, sizeof(xattr_buf), "%llu", inline_version); err = osd_req_op_xattr_init(req, 2, CEPH_OSD_OP_SETXATTR, "inline_version", xattr_buf, xattr_len, 0, 0); if (err) goto out_put; } req->r_mtime = inode->i_mtime; err = ceph_osdc_start_request(&fsc->client->osdc, req, false); if (!err) err = ceph_osdc_wait_request(&fsc->client->osdc, req); out_put: ceph_osdc_put_request(req); if (err == -ECANCELED) err = 0; out: if (page && page != locked_page) { if (from_pagecache) { unlock_page(page); put_page(page); } else __free_pages(page, 0); } dout("uninline_data %p %llx.%llx inline_version %llu = %d\n", inode, ceph_vinop(inode), inline_version, err); return err; } static const struct vm_operations_struct ceph_vmops = { .fault = ceph_filemap_fault, .page_mkwrite = ceph_page_mkwrite, }; int ceph_mmap(struct file *file, struct vm_area_struct *vma) { struct address_space *mapping = file->f_mapping; if (!mapping->a_ops->readpage) return -ENOEXEC; file_accessed(file); vma->vm_ops = &ceph_vmops; return 0; } enum { POOL_READ = 1, POOL_WRITE = 2, }; static int __ceph_pool_perm_get(struct ceph_inode_info *ci, s64 pool, struct ceph_string *pool_ns) { struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->vfs_inode); struct ceph_mds_client *mdsc = fsc->mdsc; struct ceph_osd_request *rd_req = NULL, *wr_req = NULL; struct rb_node **p, *parent; struct ceph_pool_perm *perm; struct page **pages; size_t pool_ns_len; int err = 0, err2 = 0, have = 0; down_read(&mdsc->pool_perm_rwsem); p = &mdsc->pool_perm_tree.rb_node; while (*p) { perm = rb_entry(*p, struct ceph_pool_perm, node); if (pool < perm->pool) p = &(*p)->rb_left; else if (pool > perm->pool) p = &(*p)->rb_right; else { int ret = ceph_compare_string(pool_ns, perm->pool_ns, perm->pool_ns_len); if (ret < 0) p = &(*p)->rb_left; else if (ret > 0) p = &(*p)->rb_right; else { have = perm->perm; break; } } } up_read(&mdsc->pool_perm_rwsem); if (*p) goto out; if (pool_ns) dout("__ceph_pool_perm_get pool %lld ns %.*s no perm cached\n", pool, (int)pool_ns->len, pool_ns->str); else dout("__ceph_pool_perm_get pool %lld no perm cached\n", pool); down_write(&mdsc->pool_perm_rwsem); p = &mdsc->pool_perm_tree.rb_node; parent = NULL; while (*p) { parent = *p; perm = rb_entry(parent, struct ceph_pool_perm, node); if (pool < perm->pool) p = &(*p)->rb_left; else if (pool > perm->pool) p = &(*p)->rb_right; else { int ret = ceph_compare_string(pool_ns, perm->pool_ns, perm->pool_ns_len); if (ret < 0) p = &(*p)->rb_left; else if (ret > 0) p = &(*p)->rb_right; else { have = perm->perm; break; } } } if (*p) { up_write(&mdsc->pool_perm_rwsem); goto out; } rd_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL, 1, false, GFP_NOFS); if (!rd_req) { err = -ENOMEM; goto out_unlock; } rd_req->r_flags = CEPH_OSD_FLAG_READ; osd_req_op_init(rd_req, 0, CEPH_OSD_OP_STAT, 0); rd_req->r_base_oloc.pool = pool; if (pool_ns) rd_req->r_base_oloc.pool_ns = ceph_get_string(pool_ns); ceph_oid_printf(&rd_req->r_base_oid, "%llx.00000000", ci->i_vino.ino); err = ceph_osdc_alloc_messages(rd_req, GFP_NOFS); if (err) goto out_unlock; wr_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL, 1, false, GFP_NOFS); if (!wr_req) { err = -ENOMEM; goto out_unlock; } wr_req->r_flags = CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ACK; osd_req_op_init(wr_req, 0, CEPH_OSD_OP_CREATE, CEPH_OSD_OP_FLAG_EXCL); ceph_oloc_copy(&wr_req->r_base_oloc, &rd_req->r_base_oloc); ceph_oid_copy(&wr_req->r_base_oid, &rd_req->r_base_oid); err = ceph_osdc_alloc_messages(wr_req, GFP_NOFS); if (err) goto out_unlock; /* one page should be large enough for STAT data */ pages = ceph_alloc_page_vector(1, GFP_KERNEL); if (IS_ERR(pages)) { err = PTR_ERR(pages); goto out_unlock; } osd_req_op_raw_data_in_pages(rd_req, 0, pages, PAGE_SIZE, 0, false, true); err = ceph_osdc_start_request(&fsc->client->osdc, rd_req, false); wr_req->r_mtime = ci->vfs_inode.i_mtime; err2 = ceph_osdc_start_request(&fsc->client->osdc, wr_req, false); if (!err) err = ceph_osdc_wait_request(&fsc->client->osdc, rd_req); if (!err2) err2 = ceph_osdc_wait_request(&fsc->client->osdc, wr_req); if (err >= 0 || err == -ENOENT) have |= POOL_READ; else if (err != -EPERM) goto out_unlock; if (err2 == 0 || err2 == -EEXIST) have |= POOL_WRITE; else if (err2 != -EPERM) { err = err2; goto out_unlock; } pool_ns_len = pool_ns ? pool_ns->len : 0; perm = kmalloc(sizeof(*perm) + pool_ns_len + 1, GFP_NOFS); if (!perm) { err = -ENOMEM; goto out_unlock; } perm->pool = pool; perm->perm = have; perm->pool_ns_len = pool_ns_len; if (pool_ns_len > 0) memcpy(perm->pool_ns, pool_ns->str, pool_ns_len); perm->pool_ns[pool_ns_len] = 0; rb_link_node(&perm->node, parent, p); rb_insert_color(&perm->node, &mdsc->pool_perm_tree); err = 0; out_unlock: up_write(&mdsc->pool_perm_rwsem); ceph_osdc_put_request(rd_req); ceph_osdc_put_request(wr_req); out: if (!err) err = have; if (pool_ns) dout("__ceph_pool_perm_get pool %lld ns %.*s result = %d\n", pool, (int)pool_ns->len, pool_ns->str, err); else dout("__ceph_pool_perm_get pool %lld result = %d\n", pool, err); return err; } int ceph_pool_perm_check(struct ceph_inode_info *ci, int need) { s64 pool; struct ceph_string *pool_ns; int ret, flags; if (ceph_test_mount_opt(ceph_inode_to_client(&ci->vfs_inode), NOPOOLPERM)) return 0; spin_lock(&ci->i_ceph_lock); flags = ci->i_ceph_flags; pool = ci->i_layout.pool_id; spin_unlock(&ci->i_ceph_lock); check: if (flags & CEPH_I_POOL_PERM) { if ((need & CEPH_CAP_FILE_RD) && !(flags & CEPH_I_POOL_RD)) { dout("ceph_pool_perm_check pool %lld no read perm\n", pool); return -EPERM; } if ((need & CEPH_CAP_FILE_WR) && !(flags & CEPH_I_POOL_WR)) { dout("ceph_pool_perm_check pool %lld no write perm\n", pool); return -EPERM; } return 0; } pool_ns = ceph_try_get_string(ci->i_layout.pool_ns); ret = __ceph_pool_perm_get(ci, pool, pool_ns); ceph_put_string(pool_ns); if (ret < 0) return ret; flags = CEPH_I_POOL_PERM; if (ret & POOL_READ) flags |= CEPH_I_POOL_RD; if (ret & POOL_WRITE) flags |= CEPH_I_POOL_WR; spin_lock(&ci->i_ceph_lock); if (pool == ci->i_layout.pool_id && pool_ns == rcu_dereference_raw(ci->i_layout.pool_ns)) { ci->i_ceph_flags |= flags; } else { pool = ci->i_layout.pool_id; flags = ci->i_ceph_flags; } spin_unlock(&ci->i_ceph_lock); goto check; } void ceph_pool_perm_destroy(struct ceph_mds_client *mdsc) { struct ceph_pool_perm *perm; struct rb_node *n; while (!RB_EMPTY_ROOT(&mdsc->pool_perm_tree)) { n = rb_first(&mdsc->pool_perm_tree); perm = rb_entry(n, struct ceph_pool_perm, node); rb_erase(n, &mdsc->pool_perm_tree); kfree(perm); } }