| // SPDX-License-Identifier: GPL-2.0 |
| #include <linux/ceph/ceph_debug.h> |
| |
| #include <linux/backing-dev.h> |
| #include <linux/fs.h> |
| #include <linux/mm.h> |
| #include <linux/pagemap.h> |
| #include <linux/writeback.h> /* generic_writepages */ |
| #include <linux/slab.h> |
| #include <linux/pagevec.h> |
| #include <linux/task_io_accounting_ops.h> |
| #include <linux/signal.h> |
| #include <linux/iversion.h> |
| |
| #include "super.h" |
| #include "mds_client.h" |
| #include "cache.h" |
| #include <linux/ceph/osd_client.h> |
| #include <linux/ceph/striper.h> |
| |
| /* |
| * 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; |
| |
| 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); |
| |
| return __set_page_dirty_nobuffers(page); |
| } |
| |
| /* |
| * 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); |
| |
| WARN_ON(!PageLocked(page)); |
| if (!PagePrivate(page)) |
| return; |
| |
| 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 ceph_do_readpage(struct file *filp, struct page *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); |
| 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) |
| return -EINPROGRESS; |
| |
| dout("readpage inode %p file %p page %p index %lu\n", |
| inode, filp, page, page->index); |
| err = ceph_osdc_readpages(&fsc->client->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); |
| if (err == -EBLACKLISTED) |
| fsc->blacklisted = true; |
| 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 = ceph_do_readpage(filp, page); |
| if (r != -EINPROGRESS) |
| unlock_page(page); |
| else |
| r = 0; |
| 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); |
| if (rc == -EBLACKLISTED) |
| ceph_inode_to_client(inode)->blacklisted = true; |
| |
| /* 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 ceph_rw_context *rw_ctx, |
| 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 = lru_to_page(page_list); |
| 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 (!rw_ctx) { |
| /* 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(inode, CEPH_CAP_FILE_RD, want, |
| true, &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 = lru_to_page(page_list); |
| 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_array(nr_pages, sizeof(*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; |
| osd_req_op_extent_update(req, 0, len); |
| 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); |
| struct ceph_file_info *fi = file->private_data; |
| struct ceph_rw_context *rw_ctx; |
| 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; |
| |
| rw_ctx = ceph_find_rw_context(fi); |
| max = fsc->mount_options->rsize >> PAGE_SHIFT; |
| dout("readpages %p file %p ctx %p nr_pages %d max %d\n", |
| inode, file, rw_ctx, nr_pages, max); |
| while (!list_empty(page_list)) { |
| rc = start_read(inode, rw_ctx, 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; |
| } |
| |
| struct ceph_writeback_ctl |
| { |
| loff_t i_size; |
| u64 truncate_size; |
| u32 truncate_seq; |
| bool size_stable; |
| bool head_snapc; |
| }; |
| |
| /* |
| * 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, struct ceph_writeback_ctl *ctl, |
| struct ceph_snap_context *page_snapc) |
| { |
| 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) |
| continue; |
| |
| /* get i_size, truncate_{seq,size} for page_snapc? */ |
| if (snapc && capsnap->context != page_snapc) |
| continue; |
| |
| if (ctl) { |
| if (capsnap->writing) { |
| ctl->i_size = i_size_read(inode); |
| ctl->size_stable = false; |
| } else { |
| ctl->i_size = capsnap->size; |
| ctl->size_stable = true; |
| } |
| ctl->truncate_size = capsnap->truncate_size; |
| ctl->truncate_seq = capsnap->truncate_seq; |
| ctl->head_snapc = false; |
| } |
| |
| if (snapc) |
| break; |
| |
| snapc = ceph_get_snap_context(capsnap->context); |
| if (!page_snapc || |
| page_snapc == snapc || |
| page_snapc->seq > snapc->seq) |
| 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); |
| if (ctl) { |
| ctl->i_size = i_size_read(inode); |
| ctl->truncate_size = ci->i_truncate_size; |
| ctl->truncate_seq = ci->i_truncate_seq; |
| ctl->size_stable = false; |
| ctl->head_snapc = true; |
| } |
| } |
| spin_unlock(&ci->i_ceph_lock); |
| return snapc; |
| } |
| |
| static u64 get_writepages_data_length(struct inode *inode, |
| struct page *page, u64 start) |
| { |
| struct ceph_inode_info *ci = ceph_inode(inode); |
| struct ceph_snap_context *snapc = page_snap_context(page); |
| struct ceph_cap_snap *capsnap = NULL; |
| u64 end = i_size_read(inode); |
| |
| if (snapc != ci->i_head_snapc) { |
| bool found = false; |
| spin_lock(&ci->i_ceph_lock); |
| list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { |
| if (capsnap->context == snapc) { |
| if (!capsnap->writing) |
| end = capsnap->size; |
| found = true; |
| break; |
| } |
| } |
| spin_unlock(&ci->i_ceph_lock); |
| WARN_ON(!found); |
| } |
| if (end > page_offset(page) + PAGE_SIZE) |
| end = page_offset(page) + PAGE_SIZE; |
| return end > start ? end - start : 0; |
| } |
| |
| /* |
| * Write a single page, but leave the page locked. |
| * |
| * If we get a write error, mark the mapping for error, 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_snap_context *snapc, *oldest; |
| loff_t page_off = page_offset(page); |
| int err, len = PAGE_SIZE; |
| struct ceph_writeback_ctl ceph_wbc; |
| |
| dout("writepage %p idx %lu\n", page, page->index); |
| |
| inode = page->mapping->host; |
| ci = ceph_inode(inode); |
| fsc = ceph_inode_to_client(inode); |
| |
| /* verify this is a writeable snap context */ |
| snapc = page_snap_context(page); |
| if (!snapc) { |
| dout("writepage %p page %p not dirty?\n", inode, page); |
| return 0; |
| } |
| oldest = get_oldest_context(inode, &ceph_wbc, snapc); |
| 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)); |
| ceph_put_snap_context(oldest); |
| redirty_page_for_writepage(wbc, page); |
| return 0; |
| } |
| ceph_put_snap_context(oldest); |
| |
| /* is this a partial page at end of file? */ |
| if (page_off >= ceph_wbc.i_size) { |
| dout("%p page eof %llu\n", page, ceph_wbc.i_size); |
| page->mapping->a_ops->invalidatepage(page, 0, PAGE_SIZE); |
| return 0; |
| } |
| |
| if (ceph_wbc.i_size < page_off + len) |
| len = ceph_wbc.i_size - page_off; |
| |
| dout("writepage %p page %p index %lu on %llu~%u snapc %p seq %lld\n", |
| inode, page, page->index, page_off, len, snapc, snapc->seq); |
| |
| if (atomic_long_inc_return(&fsc->writeback_count) > |
| CONGESTION_ON_THRESH(fsc->mount_options->congestion_kb)) |
| set_bdi_congested(inode_to_bdi(inode), BLK_RW_ASYNC); |
| |
| set_page_writeback(page); |
| err = ceph_osdc_writepages(&fsc->client->osdc, ceph_vino(inode), |
| &ci->i_layout, snapc, page_off, len, |
| ceph_wbc.truncate_seq, |
| ceph_wbc.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); |
| return err; |
| } |
| if (err == -EBLACKLISTED) |
| fsc->blacklisted = true; |
| dout("writepage setting page/mapping error %d %p\n", |
| err, 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 */ |
| |
| if (atomic_long_dec_return(&fsc->writeback_count) < |
| CONGESTION_OFF_THRESH(fsc->mount_options->congestion_kb)) |
| clear_bdi_congested(inode_to_bdi(inode), BLK_RW_ASYNC); |
| |
| 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; |
| } |
| |
| /* |
| * 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); |
| ceph_set_error_write(ci); |
| if (rc == -EBLACKLISTED) |
| fsc->blacklisted = true; |
| } else { |
| ceph_clear_error_write(ci); |
| } |
| |
| /* |
| * 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(inode_to_bdi(inode), |
| BLK_RW_ASYNC); |
| |
| 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); |
| |
| 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_index, end = -1; |
| struct ceph_snap_context *snapc = NULL, *last_snapc = NULL, *pgsnapc; |
| struct pagevec pvec; |
| int rc = 0; |
| unsigned int wsize = i_blocksize(inode); |
| struct ceph_osd_request *req = NULL; |
| struct ceph_writeback_ctl ceph_wbc; |
| bool should_loop, range_whole = false; |
| bool done = false; |
| |
| dout("writepages_start %p (mode=%s)\n", inode, |
| wbc->sync_mode == WB_SYNC_NONE ? "NONE" : |
| (wbc->sync_mode == WB_SYNC_ALL ? "ALL" : "HOLD")); |
| |
| if (READ_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 < wsize) |
| wsize = fsc->mount_options->wsize; |
| |
| pagevec_init(&pvec); |
| |
| start_index = wbc->range_cyclic ? mapping->writeback_index : 0; |
| index = start_index; |
| |
| retry: |
| /* find oldest snap context with dirty data */ |
| snapc = get_oldest_context(inode, &ceph_wbc, NULL); |
| 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); |
| |
| should_loop = false; |
| if (ceph_wbc.head_snapc && snapc != last_snapc) { |
| /* where to start/end? */ |
| if (wbc->range_cyclic) { |
| index = start_index; |
| end = -1; |
| if (index > 0) |
| should_loop = true; |
| dout(" cyclic, start at %lu\n", index); |
| } else { |
| index = wbc->range_start >> PAGE_SHIFT; |
| end = wbc->range_end >> PAGE_SHIFT; |
| if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) |
| range_whole = true; |
| dout(" not cyclic, %lu to %lu\n", index, end); |
| } |
| } else if (!ceph_wbc.head_snapc) { |
| /* Do not respect wbc->range_{start,end}. Dirty pages |
| * in that range can be associated with newer snapc. |
| * They are not writeable until we write all dirty pages |
| * associated with 'snapc' get written */ |
| if (index > 0) |
| should_loop = true; |
| dout(" non-head snapc, range whole\n"); |
| } |
| |
| ceph_put_snap_context(last_snapc); |
| last_snapc = snapc; |
| |
| while (!done && index <= end) { |
| int num_ops = 0, op_idx; |
| unsigned i, pvec_pages, max_pages, locked_pages = 0; |
| struct page **pages = NULL, **data_pages; |
| mempool_t *pool = NULL; /* Becomes non-null if mempool used */ |
| struct page *page; |
| pgoff_t strip_unit_end = 0; |
| u64 offset = 0, len = 0; |
| |
| max_pages = wsize >> PAGE_SHIFT; |
| |
| get_more_pages: |
| pvec_pages = pagevec_lookup_range_nr_tag(&pvec, mapping, &index, |
| end, PAGECACHE_TAG_DIRTY, |
| max_pages - locked_pages); |
| dout("pagevec_lookup_range_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); |
| continue; |
| } |
| /* only if matching snap context */ |
| pgsnapc = page_snap_context(page); |
| if (pgsnapc != snapc) { |
| dout("page snapc %p %lld != oldest %p %lld\n", |
| pgsnapc, pgsnapc->seq, snapc, snapc->seq); |
| if (!should_loop && |
| !ceph_wbc.head_snapc && |
| wbc->sync_mode != WB_SYNC_NONE) |
| should_loop = true; |
| unlock_page(page); |
| continue; |
| } |
| if (page_offset(page) >= ceph_wbc.i_size) { |
| dout("%p page eof %llu\n", |
| page, ceph_wbc.i_size); |
| if ((ceph_wbc.size_stable || |
| page_offset(page) >= i_size_read(inode)) && |
| clear_page_dirty_for_io(page)) |
| mapping->a_ops->invalidatepage(page, |
| 0, PAGE_SIZE); |
| unlock_page(page); |
| continue; |
| } |
| if (strip_unit_end && (page->index > strip_unit_end)) { |
| dout("end of strip unit %p\n", page); |
| unlock_page(page); |
| break; |
| } |
| if (PageWriteback(page)) { |
| if (wbc->sync_mode == WB_SYNC_NONE) { |
| dout("%p under writeback\n", page); |
| unlock_page(page); |
| continue; |
| } |
| dout("waiting on writeback %p\n", page); |
| wait_on_page_writeback(page); |
| } |
| |
| if (!clear_page_dirty_for_io(page)) { |
| dout("%p !clear_page_dirty_for_io\n", page); |
| unlock_page(page); |
| continue; |
| } |
| |
| /* |
| * 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; |
| u32 xlen; |
| |
| /* prepare async write request */ |
| offset = (u64)page_offset(page); |
| ceph_calc_file_object_mapping(&ci->i_layout, |
| offset, wsize, |
| &objnum, &objoff, |
| &xlen); |
| len = xlen; |
| |
| num_ops = 1; |
| strip_unit_end = page->index + |
| ((len - 1) >> PAGE_SHIFT); |
| |
| BUG_ON(pages); |
| max_pages = calc_pages_for(0, (u64)len); |
| pages = kmalloc_array(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 */ |
| 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(inode_to_bdi(inode), |
| BLK_RW_ASYNC); |
| } |
| |
| |
| pages[locked_pages++] = page; |
| pvec.pages[i] = NULL; |
| |
| len += PAGE_SIZE; |
| } |
| |
| /* did we get anything? */ |
| if (!locked_pages) |
| goto release_pvec_pages; |
| if (i) { |
| unsigned j, n = 0; |
| /* shift unused page to beginning of pvec */ |
| for (j = 0; j < pvec_pages; j++) { |
| if (!pvec.pages[j]) |
| continue; |
| if (n < j) |
| pvec.pages[n] = pvec.pages[j]; |
| n++; |
| } |
| pvec.nr = n; |
| |
| if (pvec_pages && i == pvec_pages && |
| locked_pages < max_pages) { |
| dout("reached end pvec, trying for more\n"); |
| pagevec_release(&pvec); |
| goto get_more_pages; |
| } |
| } |
| |
| 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, |
| snapc, ceph_wbc.truncate_seq, |
| ceph_wbc.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, |
| snapc, ceph_wbc.truncate_seq, |
| ceph_wbc.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 + 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 (ceph_wbc.size_stable) { |
| len = min(len, ceph_wbc.i_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 = get_writepages_data_length(inode, pages[i - 1], |
| 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); |
| |
| 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; |
| locked_pages -= i; |
| |
| /* allocate new pages array for next request */ |
| data_pages = pages; |
| pages = kmalloc_array(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; |
| |
| /* |
| * We stop writing back only if we are not doing |
| * integrity sync. In case of integrity sync we have to |
| * keep going until we have written all the pages |
| * we tagged for writeback prior to entering this loop. |
| */ |
| if (wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE) |
| done = true; |
| |
| release_pvec_pages: |
| dout("pagevec_release on %d pages (%p)\n", (int)pvec.nr, |
| pvec.nr ? pvec.pages[0] : NULL); |
| pagevec_release(&pvec); |
| } |
| |
| if (should_loop && !done) { |
| /* more to do; loop back to beginning of file */ |
| dout("writepages looping back to beginning of file\n"); |
| end = start_index - 1; /* OK even when start_index == 0 */ |
| |
| /* to write dirty pages associated with next snapc, |
| * we need to wait until current writes complete */ |
| if (wbc->sync_mode != WB_SYNC_NONE && |
| start_index == 0 && /* all dirty pages were checked */ |
| !ceph_wbc.head_snapc) { |
| struct page *page; |
| unsigned i, nr; |
| index = 0; |
| while ((index <= end) && |
| (nr = pagevec_lookup_tag(&pvec, mapping, &index, |
| PAGECACHE_TAG_WRITEBACK))) { |
| for (i = 0; i < nr; i++) { |
| page = pvec.pages[i]; |
| if (page_snap_context(page) != snapc) |
| continue; |
| wait_on_page_writeback(page); |
| } |
| pagevec_release(&pvec); |
| cond_resched(); |
| } |
| } |
| |
| start_index = 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(last_snapc); |
| dout("writepages dend - startone, 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, 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 (READ_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, 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_unlock; |
| 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 = ceph_do_readpage(file, page); |
| if (r < 0) { |
| if (r == -EINPROGRESS) |
| return -EAGAIN; |
| goto fail_unlock; |
| } |
| goto retry_locked; |
| fail_unlock: |
| 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); |
| bool check_cap = false; |
| |
| 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 (!PageUptodate(page)) { |
| if (copied < len) { |
| copied = 0; |
| goto out; |
| } |
| SetPageUptodate(page); |
| } |
| |
| /* did file size increase? */ |
| if (pos+copied > i_size_read(inode)) |
| check_cap = ceph_inode_set_size(inode, pos+copied); |
| |
| set_page_dirty(page); |
| |
| out: |
| 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 vm_fault_t ceph_filemap_fault(struct vm_fault *vmf) |
| { |
| struct vm_area_struct *vma = vmf->vma; |
| 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 = (loff_t)vmf->pgoff << PAGE_SHIFT; |
| int want, got, err; |
| sigset_t oldset; |
| vm_fault_t ret = VM_FAULT_SIGBUS; |
| |
| 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; |
| err = ceph_get_caps(vma->vm_file, CEPH_CAP_FILE_RD, want, -1, |
| &got, &pinned_page); |
| if (err < 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) { |
| CEPH_DEFINE_RW_CONTEXT(rw_ctx, got); |
| ceph_add_rw_context(fi, &rw_ctx); |
| ret = filemap_fault(vmf); |
| ceph_del_rw_context(fi, &rw_ctx); |
| dout("filemap_fault %p %llu~%zd drop cap refs %s ret %x\n", |
| inode, off, (size_t)PAGE_SIZE, |
| ceph_cap_string(got), ret); |
| } else |
| err = -EAGAIN; |
| |
| if (pinned_page) |
| put_page(pinned_page); |
| ceph_put_cap_refs(ci, got); |
| |
| if (err != -EAGAIN) |
| goto out_restore; |
| |
| /* read inline data */ |
| if (off >= PAGE_SIZE) { |
| /* does not support inline data > PAGE_SIZE */ |
| ret = VM_FAULT_SIGBUS; |
| } else { |
| 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; |
| } |
| err = __ceph_do_getattr(inode, page, |
| CEPH_STAT_CAP_INLINE_DATA, true); |
| if (err < 0 || off >= i_size_read(inode)) { |
| unlock_page(page); |
| put_page(page); |
| ret = vmf_error(err); |
| goto out_inline; |
| } |
| if (err < PAGE_SIZE) |
| zero_user_segment(page, err, 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 %x\n", |
| inode, off, (size_t)PAGE_SIZE, ret); |
| } |
| out_restore: |
| ceph_restore_sigs(&oldset); |
| if (err < 0) |
| ret = vmf_error(err); |
| |
| return ret; |
| } |
| |
| /* |
| * Reuse write_begin here for simplicity. |
| */ |
| static vm_fault_t ceph_page_mkwrite(struct vm_fault *vmf) |
| { |
| struct vm_area_struct *vma = vmf->vma; |
| 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, err; |
| sigset_t oldset; |
| vm_fault_t ret = VM_FAULT_SIGBUS; |
| |
| prealloc_cf = ceph_alloc_cap_flush(); |
| if (!prealloc_cf) |
| return VM_FAULT_OOM; |
| |
| sb_start_pagefault(inode->i_sb); |
| 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; |
| } |
| err = ceph_uninline_data(vma->vm_file, locked_page); |
| if (locked_page) |
| unlock_page(locked_page); |
| if (err < 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; |
| err = ceph_get_caps(vma->vm_file, CEPH_CAP_FILE_WR, want, off + len, |
| &got, NULL); |
| if (err < 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); |
| inode_inc_iversion_raw(inode); |
| |
| do { |
| lock_page(page); |
| |
| if ((off > size) || (page->mapping != inode->i_mapping)) { |
| unlock_page(page); |
| ret = VM_FAULT_NOPAGE; |
| break; |
| } |
| |
| err = ceph_update_writeable_page(vma->vm_file, off, len, page); |
| if (err >= 0) { |
| /* success. we'll keep the page locked. */ |
| set_page_dirty(page); |
| ret = VM_FAULT_LOCKED; |
| } |
| } while (err == -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 %x\n", |
| inode, off, len, ceph_cap_string(got), ret); |
| ceph_put_cap_refs(ci, got); |
| out_free: |
| ceph_restore_sigs(&oldset); |
| sb_end_pagefault(inode->i_sb); |
| ceph_free_cap_flush(prealloc_cf); |
| if (err < 0) |
| ret = vmf_error(err); |
| 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_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_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; |
| 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) { |
| if (err == -EBLACKLISTED) |
| fsc->blacklisted = true; |
| goto out_unlock; |
| } |
| |
| if (err2 == 0 || err2 == -EEXIST) |
| have |= POOL_WRITE; |
| else if (err2 != -EPERM) { |
| if (err2 == -EBLACKLISTED) |
| fsc->blacklisted = true; |
| 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 inode *inode, int need) |
| { |
| struct ceph_inode_info *ci = ceph_inode(inode); |
| struct ceph_string *pool_ns; |
| s64 pool; |
| int ret, flags; |
| |
| if (ci->i_vino.snap != CEPH_NOSNAP) { |
| /* |
| * Pool permission check needs to write to the first object. |
| * But for snapshot, head of the first object may have alread |
| * been deleted. Skip check to avoid creating orphan object. |
| */ |
| return 0; |
| } |
| |
| if (ceph_test_mount_opt(ceph_inode_to_client(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); |
| } |
| } |