13d14c5d2SYehuda Sadeh #include <linux/ceph/ceph_debug.h> 21d3576fdSSage Weil 31d3576fdSSage Weil #include <linux/backing-dev.h> 41d3576fdSSage Weil #include <linux/fs.h> 51d3576fdSSage Weil #include <linux/mm.h> 61d3576fdSSage Weil #include <linux/pagemap.h> 71d3576fdSSage Weil #include <linux/writeback.h> /* generic_writepages */ 85a0e3ad6STejun Heo #include <linux/slab.h> 91d3576fdSSage Weil #include <linux/pagevec.h> 101d3576fdSSage Weil #include <linux/task_io_accounting_ops.h> 111d3576fdSSage Weil 121d3576fdSSage Weil #include "super.h" 133d14c5d2SYehuda Sadeh #include "mds_client.h" 143d14c5d2SYehuda Sadeh #include <linux/ceph/osd_client.h> 151d3576fdSSage Weil 161d3576fdSSage Weil /* 171d3576fdSSage Weil * Ceph address space ops. 181d3576fdSSage Weil * 191d3576fdSSage Weil * There are a few funny things going on here. 201d3576fdSSage Weil * 211d3576fdSSage Weil * The page->private field is used to reference a struct 221d3576fdSSage Weil * ceph_snap_context for _every_ dirty page. This indicates which 231d3576fdSSage Weil * snapshot the page was logically dirtied in, and thus which snap 241d3576fdSSage Weil * context needs to be associated with the osd write during writeback. 251d3576fdSSage Weil * 261d3576fdSSage Weil * Similarly, struct ceph_inode_info maintains a set of counters to 2725985edcSLucas De Marchi * count dirty pages on the inode. In the absence of snapshots, 281d3576fdSSage Weil * i_wrbuffer_ref == i_wrbuffer_ref_head == the dirty page count. 291d3576fdSSage Weil * 301d3576fdSSage Weil * When a snapshot is taken (that is, when the client receives 311d3576fdSSage Weil * notification that a snapshot was taken), each inode with caps and 321d3576fdSSage Weil * with dirty pages (dirty pages implies there is a cap) gets a new 331d3576fdSSage Weil * ceph_cap_snap in the i_cap_snaps list (which is sorted in ascending 341d3576fdSSage Weil * order, new snaps go to the tail). The i_wrbuffer_ref_head count is 351d3576fdSSage Weil * moved to capsnap->dirty. (Unless a sync write is currently in 361d3576fdSSage Weil * progress. In that case, the capsnap is said to be "pending", new 371d3576fdSSage Weil * writes cannot start, and the capsnap isn't "finalized" until the 381d3576fdSSage Weil * write completes (or fails) and a final size/mtime for the inode for 391d3576fdSSage Weil * that snap can be settled upon.) i_wrbuffer_ref_head is reset to 0. 401d3576fdSSage Weil * 411d3576fdSSage Weil * On writeback, we must submit writes to the osd IN SNAP ORDER. So, 421d3576fdSSage Weil * we look for the first capsnap in i_cap_snaps and write out pages in 431d3576fdSSage Weil * that snap context _only_. Then we move on to the next capsnap, 441d3576fdSSage Weil * eventually reaching the "live" or "head" context (i.e., pages that 451d3576fdSSage Weil * are not yet snapped) and are writing the most recently dirtied 461d3576fdSSage Weil * pages. 471d3576fdSSage Weil * 481d3576fdSSage Weil * Invalidate and so forth must take care to ensure the dirty page 491d3576fdSSage Weil * accounting is preserved. 501d3576fdSSage Weil */ 511d3576fdSSage Weil 522baba250SYehuda Sadeh #define CONGESTION_ON_THRESH(congestion_kb) (congestion_kb >> (PAGE_SHIFT-10)) 532baba250SYehuda Sadeh #define CONGESTION_OFF_THRESH(congestion_kb) \ 542baba250SYehuda Sadeh (CONGESTION_ON_THRESH(congestion_kb) - \ 552baba250SYehuda Sadeh (CONGESTION_ON_THRESH(congestion_kb) >> 2)) 562baba250SYehuda Sadeh 5761600ef8SYan, Zheng static inline struct ceph_snap_context *page_snap_context(struct page *page) 5861600ef8SYan, Zheng { 5961600ef8SYan, Zheng if (PagePrivate(page)) 6061600ef8SYan, Zheng return (void *)page->private; 6161600ef8SYan, Zheng return NULL; 6261600ef8SYan, Zheng } 631d3576fdSSage Weil 641d3576fdSSage Weil /* 651d3576fdSSage Weil * Dirty a page. Optimistically adjust accounting, on the assumption 661d3576fdSSage Weil * that we won't race with invalidate. If we do, readjust. 671d3576fdSSage Weil */ 681d3576fdSSage Weil static int ceph_set_page_dirty(struct page *page) 691d3576fdSSage Weil { 701d3576fdSSage Weil struct address_space *mapping = page->mapping; 711d3576fdSSage Weil struct inode *inode; 721d3576fdSSage Weil struct ceph_inode_info *ci; 731d3576fdSSage Weil int undo = 0; 741d3576fdSSage Weil struct ceph_snap_context *snapc; 751d3576fdSSage Weil 761d3576fdSSage Weil if (unlikely(!mapping)) 771d3576fdSSage Weil return !TestSetPageDirty(page); 781d3576fdSSage Weil 791d3576fdSSage Weil if (TestSetPageDirty(page)) { 801d3576fdSSage Weil dout("%p set_page_dirty %p idx %lu -- already dirty\n", 811d3576fdSSage Weil mapping->host, page, page->index); 821d3576fdSSage Weil return 0; 831d3576fdSSage Weil } 841d3576fdSSage Weil 851d3576fdSSage Weil inode = mapping->host; 861d3576fdSSage Weil ci = ceph_inode(inode); 871d3576fdSSage Weil 881d3576fdSSage Weil /* 891d3576fdSSage Weil * Note that we're grabbing a snapc ref here without holding 901d3576fdSSage Weil * any locks! 911d3576fdSSage Weil */ 921d3576fdSSage Weil snapc = ceph_get_snap_context(ci->i_snap_realm->cached_context); 931d3576fdSSage Weil 941d3576fdSSage Weil /* dirty the head */ 95be655596SSage Weil spin_lock(&ci->i_ceph_lock); 967d8cb26dSSage Weil if (ci->i_head_snapc == NULL) 971d3576fdSSage Weil ci->i_head_snapc = ceph_get_snap_context(snapc); 981d3576fdSSage Weil ++ci->i_wrbuffer_ref_head; 991d3576fdSSage Weil if (ci->i_wrbuffer_ref == 0) 1000444d76aSDave Chinner ihold(inode); 1011d3576fdSSage Weil ++ci->i_wrbuffer_ref; 1021d3576fdSSage Weil dout("%p set_page_dirty %p idx %lu head %d/%d -> %d/%d " 1031d3576fdSSage Weil "snapc %p seq %lld (%d snaps)\n", 1041d3576fdSSage Weil mapping->host, page, page->index, 1051d3576fdSSage Weil ci->i_wrbuffer_ref-1, ci->i_wrbuffer_ref_head-1, 1061d3576fdSSage Weil ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head, 1071d3576fdSSage Weil snapc, snapc->seq, snapc->num_snaps); 108be655596SSage Weil spin_unlock(&ci->i_ceph_lock); 1091d3576fdSSage Weil 1101d3576fdSSage Weil /* now adjust page */ 1111d3576fdSSage Weil spin_lock_irq(&mapping->tree_lock); 1121d3576fdSSage Weil if (page->mapping) { /* Race with truncate? */ 1131d3576fdSSage Weil WARN_ON_ONCE(!PageUptodate(page)); 114679ceaceSMichael Rubin account_page_dirtied(page, page->mapping); 1151d3576fdSSage Weil radix_tree_tag_set(&mapping->page_tree, 1161d3576fdSSage Weil page_index(page), PAGECACHE_TAG_DIRTY); 1171d3576fdSSage Weil 1181d3576fdSSage Weil /* 1191d3576fdSSage Weil * Reference snap context in page->private. Also set 1201d3576fdSSage Weil * PagePrivate so that we get invalidatepage callback. 1211d3576fdSSage Weil */ 1221d3576fdSSage Weil page->private = (unsigned long)snapc; 1231d3576fdSSage Weil SetPagePrivate(page); 1241d3576fdSSage Weil } else { 1251d3576fdSSage Weil dout("ANON set_page_dirty %p (raced truncate?)\n", page); 1261d3576fdSSage Weil undo = 1; 1271d3576fdSSage Weil } 1281d3576fdSSage Weil 1291d3576fdSSage Weil spin_unlock_irq(&mapping->tree_lock); 1301d3576fdSSage Weil 1311d3576fdSSage Weil if (undo) 1321d3576fdSSage Weil /* whoops, we failed to dirty the page */ 1331d3576fdSSage Weil ceph_put_wrbuffer_cap_refs(ci, 1, snapc); 1341d3576fdSSage Weil 1351d3576fdSSage Weil __mark_inode_dirty(mapping->host, I_DIRTY_PAGES); 1361d3576fdSSage Weil 1371d3576fdSSage Weil BUG_ON(!PageDirty(page)); 1381d3576fdSSage Weil return 1; 1391d3576fdSSage Weil } 1401d3576fdSSage Weil 1411d3576fdSSage Weil /* 1421d3576fdSSage Weil * If we are truncating the full page (i.e. offset == 0), adjust the 1431d3576fdSSage Weil * dirty page counters appropriately. Only called if there is private 1441d3576fdSSage Weil * data on the page. 1451d3576fdSSage Weil */ 1461d3576fdSSage Weil static void ceph_invalidatepage(struct page *page, unsigned long offset) 1471d3576fdSSage Weil { 1484ce1e9adSAlexander Beregalov struct inode *inode; 1491d3576fdSSage Weil struct ceph_inode_info *ci; 15061600ef8SYan, Zheng struct ceph_snap_context *snapc = page_snap_context(page); 1511d3576fdSSage Weil 1521d3576fdSSage Weil BUG_ON(!PageLocked(page)); 1531d3576fdSSage Weil BUG_ON(!PagePrivate(page)); 1541d3576fdSSage Weil BUG_ON(!page->mapping); 1551d3576fdSSage Weil 1564ce1e9adSAlexander Beregalov inode = page->mapping->host; 1574ce1e9adSAlexander Beregalov 1581d3576fdSSage Weil /* 1591d3576fdSSage Weil * We can get non-dirty pages here due to races between 1601d3576fdSSage Weil * set_page_dirty and truncate_complete_page; just spit out a 1611d3576fdSSage Weil * warning, in case we end up with accounting problems later. 1621d3576fdSSage Weil */ 1631d3576fdSSage Weil if (!PageDirty(page)) 1641d3576fdSSage Weil pr_err("%p invalidatepage %p page not dirty\n", inode, page); 1651d3576fdSSage Weil 1661d3576fdSSage Weil if (offset == 0) 1671d3576fdSSage Weil ClearPageChecked(page); 1681d3576fdSSage Weil 1691d3576fdSSage Weil ci = ceph_inode(inode); 1701d3576fdSSage Weil if (offset == 0) { 1711d3576fdSSage Weil dout("%p invalidatepage %p idx %lu full dirty page %lu\n", 1721d3576fdSSage Weil inode, page, page->index, offset); 1731d3576fdSSage Weil ceph_put_wrbuffer_cap_refs(ci, 1, snapc); 1741d3576fdSSage Weil ceph_put_snap_context(snapc); 1751d3576fdSSage Weil page->private = 0; 1761d3576fdSSage Weil ClearPagePrivate(page); 1771d3576fdSSage Weil } else { 1781d3576fdSSage Weil dout("%p invalidatepage %p idx %lu partial dirty page\n", 1791d3576fdSSage Weil inode, page, page->index); 1801d3576fdSSage Weil } 1811d3576fdSSage Weil } 1821d3576fdSSage Weil 1831d3576fdSSage Weil /* just a sanity check */ 1841d3576fdSSage Weil static int ceph_releasepage(struct page *page, gfp_t g) 1851d3576fdSSage Weil { 1861d3576fdSSage Weil struct inode *inode = page->mapping ? page->mapping->host : NULL; 1871d3576fdSSage Weil dout("%p releasepage %p idx %lu\n", inode, page, page->index); 1881d3576fdSSage Weil WARN_ON(PageDirty(page)); 1891d3576fdSSage Weil WARN_ON(PagePrivate(page)); 1901d3576fdSSage Weil return 0; 1911d3576fdSSage Weil } 1921d3576fdSSage Weil 1931d3576fdSSage Weil /* 1941d3576fdSSage Weil * read a single page, without unlocking it. 1951d3576fdSSage Weil */ 1961d3576fdSSage Weil static int readpage_nounlock(struct file *filp, struct page *page) 1971d3576fdSSage Weil { 198496ad9aaSAl Viro struct inode *inode = file_inode(filp); 1991d3576fdSSage Weil struct ceph_inode_info *ci = ceph_inode(inode); 2003d14c5d2SYehuda Sadeh struct ceph_osd_client *osdc = 2013d14c5d2SYehuda Sadeh &ceph_inode_to_client(inode)->client->osdc; 2021d3576fdSSage Weil int err = 0; 2031d3576fdSSage Weil u64 len = PAGE_CACHE_SIZE; 2041d3576fdSSage Weil 2051d3576fdSSage Weil dout("readpage inode %p file %p page %p index %lu\n", 2061d3576fdSSage Weil inode, filp, page, page->index); 2071d3576fdSSage Weil err = ceph_osdc_readpages(osdc, ceph_vino(inode), &ci->i_layout, 2086285bc23SAlex Elder (u64) page_offset(page), &len, 2091d3576fdSSage Weil ci->i_truncate_seq, ci->i_truncate_size, 210b7495fc2SSage Weil &page, 1, 0); 2111d3576fdSSage Weil if (err == -ENOENT) 2121d3576fdSSage Weil err = 0; 2131d3576fdSSage Weil if (err < 0) { 2141d3576fdSSage Weil SetPageError(page); 2151d3576fdSSage Weil goto out; 2161d3576fdSSage Weil } else if (err < PAGE_CACHE_SIZE) { 2171d3576fdSSage Weil /* zero fill remainder of page */ 2181d3576fdSSage Weil zero_user_segment(page, err, PAGE_CACHE_SIZE); 2191d3576fdSSage Weil } 2201d3576fdSSage Weil SetPageUptodate(page); 2211d3576fdSSage Weil 2221d3576fdSSage Weil out: 2231d3576fdSSage Weil return err < 0 ? err : 0; 2241d3576fdSSage Weil } 2251d3576fdSSage Weil 2261d3576fdSSage Weil static int ceph_readpage(struct file *filp, struct page *page) 2271d3576fdSSage Weil { 2281d3576fdSSage Weil int r = readpage_nounlock(filp, page); 2291d3576fdSSage Weil unlock_page(page); 2301d3576fdSSage Weil return r; 2311d3576fdSSage Weil } 2321d3576fdSSage Weil 2331d3576fdSSage Weil /* 2347c272194SSage Weil * Finish an async read(ahead) op. 2351d3576fdSSage Weil */ 2367c272194SSage Weil static void finish_read(struct ceph_osd_request *req, struct ceph_msg *msg) 2371d3576fdSSage Weil { 2387c272194SSage Weil struct inode *inode = req->r_inode; 2391b83bef2SSage Weil int rc = req->r_result; 2401b83bef2SSage Weil int bytes = le32_to_cpu(msg->hdr.data_len); 241e0c59487SAlex Elder int num_pages; 2427c272194SSage Weil int i; 2437c272194SSage Weil 2447c272194SSage Weil dout("finish_read %p req %p rc %d bytes %d\n", inode, req, rc, bytes); 2457c272194SSage Weil 2467c272194SSage Weil /* unlock all pages, zeroing any data we didn't read */ 2470fff87ecSAlex Elder BUG_ON(req->r_data_in.type != CEPH_OSD_DATA_TYPE_PAGES); 248e0c59487SAlex Elder num_pages = calc_pages_for((u64)req->r_data_in.alignment, 249e0c59487SAlex Elder (u64)req->r_data_in.length); 250e0c59487SAlex Elder for (i = 0; i < num_pages; i++) { 2510fff87ecSAlex Elder struct page *page = req->r_data_in.pages[i]; 2527c272194SSage Weil 2537c272194SSage Weil if (bytes < (int)PAGE_CACHE_SIZE) { 2547c272194SSage Weil /* zero (remainder of) page */ 2557c272194SSage Weil int s = bytes < 0 ? 0 : bytes; 2567c272194SSage Weil zero_user_segment(page, s, PAGE_CACHE_SIZE); 2577c272194SSage Weil } 2587c272194SSage Weil dout("finish_read %p uptodate %p idx %lu\n", inode, page, 2597c272194SSage Weil page->index); 2607c272194SSage Weil flush_dcache_page(page); 2617c272194SSage Weil SetPageUptodate(page); 2627c272194SSage Weil unlock_page(page); 2637c272194SSage Weil page_cache_release(page); 2640fff87ecSAlex Elder bytes -= PAGE_CACHE_SIZE; 2657c272194SSage Weil } 2660fff87ecSAlex Elder kfree(req->r_data_in.pages); 2677c272194SSage Weil } 2687c272194SSage Weil 2698884d53dSDavid Zafman static void ceph_unlock_page_vector(struct page **pages, int num_pages) 2708884d53dSDavid Zafman { 2718884d53dSDavid Zafman int i; 2728884d53dSDavid Zafman 2738884d53dSDavid Zafman for (i = 0; i < num_pages; i++) 2748884d53dSDavid Zafman unlock_page(pages[i]); 2758884d53dSDavid Zafman } 2768884d53dSDavid Zafman 2777c272194SSage Weil /* 2787c272194SSage Weil * start an async read(ahead) operation. return nr_pages we submitted 2797c272194SSage Weil * a read for on success, or negative error code. 2807c272194SSage Weil */ 2810d66a487SSage Weil static int start_read(struct inode *inode, struct list_head *page_list, int max) 2827c272194SSage Weil { 2837c272194SSage Weil struct ceph_osd_client *osdc = 2847c272194SSage Weil &ceph_inode_to_client(inode)->client->osdc; 2857c272194SSage Weil struct ceph_inode_info *ci = ceph_inode(inode); 2867c272194SSage Weil struct page *page = list_entry(page_list->prev, struct page, lru); 287acead002SAlex Elder struct ceph_vino vino; 2887c272194SSage Weil struct ceph_osd_request *req; 289acead002SAlex Elder struct ceph_osd_req_op op; 2907c272194SSage Weil u64 off; 2917c272194SSage Weil u64 len; 2927c272194SSage Weil int i; 2931d3576fdSSage Weil struct page **pages; 2947c272194SSage Weil pgoff_t next_index; 2957c272194SSage Weil int nr_pages = 0; 2967c272194SSage Weil int ret; 2977c272194SSage Weil 2986285bc23SAlex Elder off = (u64) page_offset(page); 2997c272194SSage Weil 3007c272194SSage Weil /* count pages */ 3017c272194SSage Weil next_index = page->index; 3027c272194SSage Weil list_for_each_entry_reverse(page, page_list, lru) { 3037c272194SSage Weil if (page->index != next_index) 3047c272194SSage Weil break; 3057c272194SSage Weil nr_pages++; 3067c272194SSage Weil next_index++; 3070d66a487SSage Weil if (max && nr_pages == max) 3080d66a487SSage Weil break; 3097c272194SSage Weil } 3107c272194SSage Weil len = nr_pages << PAGE_CACHE_SHIFT; 3117c272194SSage Weil dout("start_read %p nr_pages %d is %lld~%lld\n", inode, nr_pages, 3127c272194SSage Weil off, len); 313acead002SAlex Elder vino = ceph_vino(inode); 314acead002SAlex Elder req = ceph_osdc_new_request(osdc, &ci->i_layout, vino, off, &len, 315acead002SAlex Elder 1, &op, CEPH_OSD_OP_READ, 316acead002SAlex Elder CEPH_OSD_FLAG_READ, NULL, 3177c272194SSage Weil ci->i_truncate_seq, ci->i_truncate_size, 318acead002SAlex Elder false); 3196816282dSSage Weil if (IS_ERR(req)) 3206816282dSSage Weil return PTR_ERR(req); 3211d3576fdSSage Weil 322acead002SAlex Elder ceph_osdc_build_request(req, off, 1, &op, NULL, vino.snap, NULL); 323acead002SAlex Elder 3241d3576fdSSage Weil /* build page vector */ 325cf7b7e14SAlex Elder nr_pages = calc_pages_for(0, len); 3267c272194SSage Weil pages = kmalloc(sizeof(*pages) * nr_pages, GFP_NOFS); 3277c272194SSage Weil ret = -ENOMEM; 3281d3576fdSSage Weil if (!pages) 3297c272194SSage Weil goto out; 3307c272194SSage Weil for (i = 0; i < nr_pages; ++i) { 3317c272194SSage Weil page = list_entry(page_list->prev, struct page, lru); 3327c272194SSage Weil BUG_ON(PageLocked(page)); 3337c272194SSage Weil list_del(&page->lru); 3341d3576fdSSage Weil 3357c272194SSage Weil dout("start_read %p adding %p idx %lu\n", inode, page, 3367c272194SSage Weil page->index); 3377c272194SSage Weil if (add_to_page_cache_lru(page, &inode->i_data, page->index, 3387c272194SSage Weil GFP_NOFS)) { 3397c272194SSage Weil page_cache_release(page); 3407c272194SSage Weil dout("start_read %p add_to_page_cache failed %p\n", 3417c272194SSage Weil inode, page); 3427c272194SSage Weil nr_pages = i; 3437c272194SSage Weil goto out_pages; 3441d3576fdSSage Weil } 3457c272194SSage Weil pages[i] = page; 3461d3576fdSSage Weil } 3470fff87ecSAlex Elder req->r_data_in.type = CEPH_OSD_DATA_TYPE_PAGES; 3480fff87ecSAlex Elder req->r_data_in.pages = pages; 349e0c59487SAlex Elder req->r_data_in.length = len; 3500fff87ecSAlex Elder req->r_data_in.alignment = 0; 3517c272194SSage Weil req->r_callback = finish_read; 3527c272194SSage Weil req->r_inode = inode; 3537c272194SSage Weil 3547c272194SSage Weil dout("start_read %p starting %p %lld~%lld\n", inode, req, off, len); 3557c272194SSage Weil ret = ceph_osdc_start_request(osdc, req, false); 3567c272194SSage Weil if (ret < 0) 3577c272194SSage Weil goto out_pages; 3587c272194SSage Weil ceph_osdc_put_request(req); 3597c272194SSage Weil return nr_pages; 3607c272194SSage Weil 3617c272194SSage Weil out_pages: 3628884d53dSDavid Zafman ceph_unlock_page_vector(pages, nr_pages); 3637c272194SSage Weil ceph_release_page_vector(pages, nr_pages); 3647c272194SSage Weil out: 3657c272194SSage Weil ceph_osdc_put_request(req); 3667c272194SSage Weil return ret; 3671d3576fdSSage Weil } 3681d3576fdSSage Weil 3697c272194SSage Weil 3701d3576fdSSage Weil /* 3711d3576fdSSage Weil * Read multiple pages. Leave pages we don't read + unlock in page_list; 3721d3576fdSSage Weil * the caller (VM) cleans them up. 3731d3576fdSSage Weil */ 3741d3576fdSSage Weil static int ceph_readpages(struct file *file, struct address_space *mapping, 3751d3576fdSSage Weil struct list_head *page_list, unsigned nr_pages) 3761d3576fdSSage Weil { 377496ad9aaSAl Viro struct inode *inode = file_inode(file); 3780d66a487SSage Weil struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 3791d3576fdSSage Weil int rc = 0; 3800d66a487SSage Weil int max = 0; 3811d3576fdSSage Weil 3820d66a487SSage Weil if (fsc->mount_options->rsize >= PAGE_CACHE_SIZE) 3830d66a487SSage Weil max = (fsc->mount_options->rsize + PAGE_CACHE_SIZE - 1) 3840d66a487SSage Weil >> PAGE_SHIFT; 3850d66a487SSage Weil 3862794a82aSAlex Elder dout("readpages %p file %p nr_pages %d max %d\n", inode, 3872794a82aSAlex Elder file, nr_pages, 3880d66a487SSage Weil max); 3897c272194SSage Weil while (!list_empty(page_list)) { 3900d66a487SSage Weil rc = start_read(inode, page_list, max); 3911d3576fdSSage Weil if (rc < 0) 3921d3576fdSSage Weil goto out; 3937c272194SSage Weil BUG_ON(rc == 0); 3941d3576fdSSage Weil } 3951d3576fdSSage Weil out: 3967c272194SSage Weil dout("readpages %p file %p ret %d\n", inode, file, rc); 3971d3576fdSSage Weil return rc; 3981d3576fdSSage Weil } 3991d3576fdSSage Weil 4001d3576fdSSage Weil /* 4011d3576fdSSage Weil * Get ref for the oldest snapc for an inode with dirty data... that is, the 4021d3576fdSSage Weil * only snap context we are allowed to write back. 4031d3576fdSSage Weil */ 4046298a337SSage Weil static struct ceph_snap_context *get_oldest_context(struct inode *inode, 4051d3576fdSSage Weil u64 *snap_size) 4061d3576fdSSage Weil { 4071d3576fdSSage Weil struct ceph_inode_info *ci = ceph_inode(inode); 4081d3576fdSSage Weil struct ceph_snap_context *snapc = NULL; 4091d3576fdSSage Weil struct ceph_cap_snap *capsnap = NULL; 4101d3576fdSSage Weil 411be655596SSage Weil spin_lock(&ci->i_ceph_lock); 4121d3576fdSSage Weil list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { 4131d3576fdSSage Weil dout(" cap_snap %p snapc %p has %d dirty pages\n", capsnap, 4141d3576fdSSage Weil capsnap->context, capsnap->dirty_pages); 4151d3576fdSSage Weil if (capsnap->dirty_pages) { 4161d3576fdSSage Weil snapc = ceph_get_snap_context(capsnap->context); 4171d3576fdSSage Weil if (snap_size) 4181d3576fdSSage Weil *snap_size = capsnap->size; 4191d3576fdSSage Weil break; 4201d3576fdSSage Weil } 4211d3576fdSSage Weil } 4227d8cb26dSSage Weil if (!snapc && ci->i_wrbuffer_ref_head) { 42380e755feSSage Weil snapc = ceph_get_snap_context(ci->i_head_snapc); 4241d3576fdSSage Weil dout(" head snapc %p has %d dirty pages\n", 4251d3576fdSSage Weil snapc, ci->i_wrbuffer_ref_head); 4261d3576fdSSage Weil } 427be655596SSage Weil spin_unlock(&ci->i_ceph_lock); 4281d3576fdSSage Weil return snapc; 4291d3576fdSSage Weil } 4301d3576fdSSage Weil 4311d3576fdSSage Weil /* 4321d3576fdSSage Weil * Write a single page, but leave the page locked. 4331d3576fdSSage Weil * 4341d3576fdSSage Weil * If we get a write error, set the page error bit, but still adjust the 4351d3576fdSSage Weil * dirty page accounting (i.e., page is no longer dirty). 4361d3576fdSSage Weil */ 4371d3576fdSSage Weil static int writepage_nounlock(struct page *page, struct writeback_control *wbc) 4381d3576fdSSage Weil { 4391d3576fdSSage Weil struct inode *inode; 4401d3576fdSSage Weil struct ceph_inode_info *ci; 4413d14c5d2SYehuda Sadeh struct ceph_fs_client *fsc; 4421d3576fdSSage Weil struct ceph_osd_client *osdc; 4436285bc23SAlex Elder loff_t page_off = page_offset(page); 4441d3576fdSSage Weil int len = PAGE_CACHE_SIZE; 4451d3576fdSSage Weil loff_t i_size; 4461d3576fdSSage Weil int err = 0; 4476298a337SSage Weil struct ceph_snap_context *snapc, *oldest; 4481d3576fdSSage Weil u64 snap_size = 0; 4492baba250SYehuda Sadeh long writeback_stat; 4501d3576fdSSage Weil 4511d3576fdSSage Weil dout("writepage %p idx %lu\n", page, page->index); 4521d3576fdSSage Weil 4531d3576fdSSage Weil if (!page->mapping || !page->mapping->host) { 4541d3576fdSSage Weil dout("writepage %p - no mapping\n", page); 4551d3576fdSSage Weil return -EFAULT; 4561d3576fdSSage Weil } 4571d3576fdSSage Weil inode = page->mapping->host; 4581d3576fdSSage Weil ci = ceph_inode(inode); 4593d14c5d2SYehuda Sadeh fsc = ceph_inode_to_client(inode); 4603d14c5d2SYehuda Sadeh osdc = &fsc->client->osdc; 4611d3576fdSSage Weil 4621d3576fdSSage Weil /* verify this is a writeable snap context */ 46361600ef8SYan, Zheng snapc = page_snap_context(page); 4641d3576fdSSage Weil if (snapc == NULL) { 4651d3576fdSSage Weil dout("writepage %p page %p not dirty?\n", inode, page); 4661d3576fdSSage Weil goto out; 4671d3576fdSSage Weil } 4686298a337SSage Weil oldest = get_oldest_context(inode, &snap_size); 4696298a337SSage Weil if (snapc->seq > oldest->seq) { 4701d3576fdSSage Weil dout("writepage %p page %p snapc %p not writeable - noop\n", 47161600ef8SYan, Zheng inode, page, snapc); 4721d3576fdSSage Weil /* we should only noop if called by kswapd */ 4731d3576fdSSage Weil WARN_ON((current->flags & PF_MEMALLOC) == 0); 4746298a337SSage Weil ceph_put_snap_context(oldest); 4751d3576fdSSage Weil goto out; 4761d3576fdSSage Weil } 4776298a337SSage Weil ceph_put_snap_context(oldest); 4781d3576fdSSage Weil 4791d3576fdSSage Weil /* is this a partial page at end of file? */ 4801d3576fdSSage Weil if (snap_size) 4811d3576fdSSage Weil i_size = snap_size; 4821d3576fdSSage Weil else 4831d3576fdSSage Weil i_size = i_size_read(inode); 4841d3576fdSSage Weil if (i_size < page_off + len) 4851d3576fdSSage Weil len = i_size - page_off; 4861d3576fdSSage Weil 487ae00d4f3SSage Weil dout("writepage %p page %p index %lu on %llu~%u snapc %p\n", 488ae00d4f3SSage Weil inode, page, page->index, page_off, len, snapc); 4891d3576fdSSage Weil 4903d14c5d2SYehuda Sadeh writeback_stat = atomic_long_inc_return(&fsc->writeback_count); 4912baba250SYehuda Sadeh if (writeback_stat > 4923d14c5d2SYehuda Sadeh CONGESTION_ON_THRESH(fsc->mount_options->congestion_kb)) 4933d14c5d2SYehuda Sadeh set_bdi_congested(&fsc->backing_dev_info, BLK_RW_ASYNC); 4942baba250SYehuda Sadeh 4951d3576fdSSage Weil set_page_writeback(page); 4961d3576fdSSage Weil err = ceph_osdc_writepages(osdc, ceph_vino(inode), 4971d3576fdSSage Weil &ci->i_layout, snapc, 4981d3576fdSSage Weil page_off, len, 4991d3576fdSSage Weil ci->i_truncate_seq, ci->i_truncate_size, 50024808826SAlex Elder &inode->i_mtime, &page, 1); 5011d3576fdSSage Weil if (err < 0) { 5021d3576fdSSage Weil dout("writepage setting page/mapping error %d %p\n", err, page); 5031d3576fdSSage Weil SetPageError(page); 5041d3576fdSSage Weil mapping_set_error(&inode->i_data, err); 5051d3576fdSSage Weil if (wbc) 5061d3576fdSSage Weil wbc->pages_skipped++; 5071d3576fdSSage Weil } else { 5081d3576fdSSage Weil dout("writepage cleaned page %p\n", page); 5091d3576fdSSage Weil err = 0; /* vfs expects us to return 0 */ 5101d3576fdSSage Weil } 5111d3576fdSSage Weil page->private = 0; 5121d3576fdSSage Weil ClearPagePrivate(page); 5131d3576fdSSage Weil end_page_writeback(page); 5141d3576fdSSage Weil ceph_put_wrbuffer_cap_refs(ci, 1, snapc); 5156298a337SSage Weil ceph_put_snap_context(snapc); /* page's reference */ 5161d3576fdSSage Weil out: 5171d3576fdSSage Weil return err; 5181d3576fdSSage Weil } 5191d3576fdSSage Weil 5201d3576fdSSage Weil static int ceph_writepage(struct page *page, struct writeback_control *wbc) 5211d3576fdSSage Weil { 522dbd646a8SYehuda Sadeh int err; 523dbd646a8SYehuda Sadeh struct inode *inode = page->mapping->host; 524dbd646a8SYehuda Sadeh BUG_ON(!inode); 52570b666c3SSage Weil ihold(inode); 526dbd646a8SYehuda Sadeh err = writepage_nounlock(page, wbc); 5271d3576fdSSage Weil unlock_page(page); 528dbd646a8SYehuda Sadeh iput(inode); 5291d3576fdSSage Weil return err; 5301d3576fdSSage Weil } 5311d3576fdSSage Weil 5321d3576fdSSage Weil 5331d3576fdSSage Weil /* 5341d3576fdSSage Weil * lame release_pages helper. release_pages() isn't exported to 5351d3576fdSSage Weil * modules. 5361d3576fdSSage Weil */ 5371d3576fdSSage Weil static void ceph_release_pages(struct page **pages, int num) 5381d3576fdSSage Weil { 5391d3576fdSSage Weil struct pagevec pvec; 5401d3576fdSSage Weil int i; 5411d3576fdSSage Weil 5421d3576fdSSage Weil pagevec_init(&pvec, 0); 5431d3576fdSSage Weil for (i = 0; i < num; i++) { 5441d3576fdSSage Weil if (pagevec_add(&pvec, pages[i]) == 0) 5451d3576fdSSage Weil pagevec_release(&pvec); 5461d3576fdSSage Weil } 5471d3576fdSSage Weil pagevec_release(&pvec); 5481d3576fdSSage Weil } 5491d3576fdSSage Weil 5501d3576fdSSage Weil 5511d3576fdSSage Weil /* 5521d3576fdSSage Weil * async writeback completion handler. 5531d3576fdSSage Weil * 5541d3576fdSSage Weil * If we get an error, set the mapping error bit, but not the individual 5551d3576fdSSage Weil * page error bits. 5561d3576fdSSage Weil */ 5571d3576fdSSage Weil static void writepages_finish(struct ceph_osd_request *req, 5581d3576fdSSage Weil struct ceph_msg *msg) 5591d3576fdSSage Weil { 5601d3576fdSSage Weil struct inode *inode = req->r_inode; 5611d3576fdSSage Weil struct ceph_inode_info *ci = ceph_inode(inode); 5621d3576fdSSage Weil unsigned wrote; 5631d3576fdSSage Weil struct page *page; 564e0c59487SAlex Elder int num_pages; 5651d3576fdSSage Weil int i; 5661d3576fdSSage Weil struct ceph_snap_context *snapc = req->r_snapc; 5671d3576fdSSage Weil struct address_space *mapping = inode->i_mapping; 5681b83bef2SSage Weil int rc = req->r_result; 5691b83bef2SSage Weil u64 bytes = le64_to_cpu(req->r_request_ops[0].extent.length); 5703d14c5d2SYehuda Sadeh struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 5712baba250SYehuda Sadeh long writeback_stat; 5727ff899daSSage Weil unsigned issued = ceph_caps_issued(ci); 5731d3576fdSSage Weil 5740fff87ecSAlex Elder BUG_ON(req->r_data_out.type != CEPH_OSD_DATA_TYPE_PAGES); 575e0c59487SAlex Elder num_pages = calc_pages_for((u64)req->r_data_out.alignment, 576e0c59487SAlex Elder (u64)req->r_data_out.length); 5771d3576fdSSage Weil if (rc >= 0) { 57879788c69SSage Weil /* 57979788c69SSage Weil * Assume we wrote the pages we originally sent. The 58079788c69SSage Weil * osd might reply with fewer pages if our writeback 58179788c69SSage Weil * raced with a truncation and was adjusted at the osd, 58279788c69SSage Weil * so don't believe the reply. 58379788c69SSage Weil */ 584e0c59487SAlex Elder wrote = num_pages; 5851d3576fdSSage Weil } else { 5861d3576fdSSage Weil wrote = 0; 5871d3576fdSSage Weil mapping_set_error(mapping, rc); 5881d3576fdSSage Weil } 5891d3576fdSSage Weil dout("writepages_finish %p rc %d bytes %llu wrote %d (pages)\n", 5901d3576fdSSage Weil inode, rc, bytes, wrote); 5911d3576fdSSage Weil 5921d3576fdSSage Weil /* clean all pages */ 593e0c59487SAlex Elder for (i = 0; i < num_pages; i++) { 5940fff87ecSAlex Elder page = req->r_data_out.pages[i]; 5951d3576fdSSage Weil BUG_ON(!page); 5961d3576fdSSage Weil WARN_ON(!PageUptodate(page)); 5971d3576fdSSage Weil 5982baba250SYehuda Sadeh writeback_stat = 5993d14c5d2SYehuda Sadeh atomic_long_dec_return(&fsc->writeback_count); 6002baba250SYehuda Sadeh if (writeback_stat < 6013d14c5d2SYehuda Sadeh CONGESTION_OFF_THRESH(fsc->mount_options->congestion_kb)) 6023d14c5d2SYehuda Sadeh clear_bdi_congested(&fsc->backing_dev_info, 6032baba250SYehuda Sadeh BLK_RW_ASYNC); 6042baba250SYehuda Sadeh 60561600ef8SYan, Zheng ceph_put_snap_context(page_snap_context(page)); 6061d3576fdSSage Weil page->private = 0; 6071d3576fdSSage Weil ClearPagePrivate(page); 6081d3576fdSSage Weil dout("unlocking %d %p\n", i, page); 6091d3576fdSSage Weil end_page_writeback(page); 610e63dc5c7SYehuda Sadeh 611e63dc5c7SYehuda Sadeh /* 612e63dc5c7SYehuda Sadeh * We lost the cache cap, need to truncate the page before 613e63dc5c7SYehuda Sadeh * it is unlocked, otherwise we'd truncate it later in the 614e63dc5c7SYehuda Sadeh * page truncation thread, possibly losing some data that 615e63dc5c7SYehuda Sadeh * raced its way in 616e63dc5c7SYehuda Sadeh */ 6172962507cSSage Weil if ((issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0) 618e63dc5c7SYehuda Sadeh generic_error_remove_page(inode->i_mapping, page); 619e63dc5c7SYehuda Sadeh 6201d3576fdSSage Weil unlock_page(page); 6211d3576fdSSage Weil } 6221d3576fdSSage Weil dout("%p wrote+cleaned %d pages\n", inode, wrote); 623e0c59487SAlex Elder ceph_put_wrbuffer_cap_refs(ci, num_pages, snapc); 6241d3576fdSSage Weil 625e0c59487SAlex Elder ceph_release_pages(req->r_data_out.pages, num_pages); 6260fff87ecSAlex Elder if (req->r_data_out.pages_from_pool) 6270fff87ecSAlex Elder mempool_free(req->r_data_out.pages, 628640ef79dSCheng Renquan ceph_sb_to_client(inode->i_sb)->wb_pagevec_pool); 6291d3576fdSSage Weil else 6300fff87ecSAlex Elder kfree(req->r_data_out.pages); 6311d3576fdSSage Weil ceph_osdc_put_request(req); 6321d3576fdSSage Weil } 6331d3576fdSSage Weil 6341d3576fdSSage Weil /* 6351d3576fdSSage Weil * allocate a page vec, either directly, or if necessary, via a the 636e0c59487SAlex Elder * mempool. we avoid the mempool if we can because req->r_data_out.length 6371d3576fdSSage Weil * may be less than the maximum write size. 6381d3576fdSSage Weil */ 6393d14c5d2SYehuda Sadeh static void alloc_page_vec(struct ceph_fs_client *fsc, 6401d3576fdSSage Weil struct ceph_osd_request *req) 6411d3576fdSSage Weil { 6420fff87ecSAlex Elder size_t size; 643e0c59487SAlex Elder int num_pages; 6440fff87ecSAlex Elder 645e0c59487SAlex Elder num_pages = calc_pages_for((u64)req->r_data_out.alignment, 646e0c59487SAlex Elder (u64)req->r_data_out.length); 647e0c59487SAlex Elder size = sizeof (struct page *) * num_pages; 6480fff87ecSAlex Elder req->r_data_out.pages = kmalloc(size, GFP_NOFS); 6490fff87ecSAlex Elder if (!req->r_data_out.pages) { 6500fff87ecSAlex Elder req->r_data_out.pages = mempool_alloc(fsc->wb_pagevec_pool, 6511d3576fdSSage Weil GFP_NOFS); 6520fff87ecSAlex Elder req->r_data_out.pages_from_pool = 1; 6530fff87ecSAlex Elder WARN_ON(!req->r_data_out.pages); 6541d3576fdSSage Weil } 6551d3576fdSSage Weil } 6561d3576fdSSage Weil 657*94fe8420SAlex Elder static struct ceph_osd_request * 658*94fe8420SAlex Elder ceph_writepages_osd_request(struct inode *inode, u64 offset, u64 *len, 659*94fe8420SAlex Elder struct ceph_snap_context *snapc, 660*94fe8420SAlex Elder int num_ops, struct ceph_osd_req_op *ops) 661*94fe8420SAlex Elder { 662*94fe8420SAlex Elder struct ceph_fs_client *fsc; 663*94fe8420SAlex Elder struct ceph_inode_info *ci; 664*94fe8420SAlex Elder struct ceph_vino vino; 665*94fe8420SAlex Elder 666*94fe8420SAlex Elder fsc = ceph_inode_to_client(inode); 667*94fe8420SAlex Elder ci = ceph_inode(inode); 668*94fe8420SAlex Elder vino = ceph_vino(inode); 669*94fe8420SAlex Elder /* BUG_ON(vino.snap != CEPH_NOSNAP); */ 670*94fe8420SAlex Elder 671*94fe8420SAlex Elder return ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, 672*94fe8420SAlex Elder vino, offset, len, num_ops, ops, CEPH_OSD_OP_WRITE, 673*94fe8420SAlex Elder CEPH_OSD_FLAG_WRITE|CEPH_OSD_FLAG_ONDISK, 674*94fe8420SAlex Elder snapc, ci->i_truncate_seq, ci->i_truncate_size, true); 675*94fe8420SAlex Elder } 676*94fe8420SAlex Elder 6771d3576fdSSage Weil /* 6781d3576fdSSage Weil * initiate async writeback 6791d3576fdSSage Weil */ 6801d3576fdSSage Weil static int ceph_writepages_start(struct address_space *mapping, 6811d3576fdSSage Weil struct writeback_control *wbc) 6821d3576fdSSage Weil { 6831d3576fdSSage Weil struct inode *inode = mapping->host; 6841d3576fdSSage Weil struct ceph_inode_info *ci = ceph_inode(inode); 6853d14c5d2SYehuda Sadeh struct ceph_fs_client *fsc; 6861d3576fdSSage Weil pgoff_t index, start, end; 6871d3576fdSSage Weil int range_whole = 0; 6881d3576fdSSage Weil int should_loop = 1; 6891d3576fdSSage Weil pgoff_t max_pages = 0, max_pages_ever = 0; 69080e755feSSage Weil struct ceph_snap_context *snapc = NULL, *last_snapc = NULL, *pgsnapc; 6911d3576fdSSage Weil struct pagevec pvec; 6921d3576fdSSage Weil int done = 0; 6931d3576fdSSage Weil int rc = 0; 6941d3576fdSSage Weil unsigned wsize = 1 << inode->i_blkbits; 6951d3576fdSSage Weil struct ceph_osd_request *req = NULL; 6961d3576fdSSage Weil int do_sync; 6971d3576fdSSage Weil u64 snap_size = 0; 6981d3576fdSSage Weil 6991d3576fdSSage Weil /* 7001d3576fdSSage Weil * Include a 'sync' in the OSD request if this is a data 7011d3576fdSSage Weil * integrity write (e.g., O_SYNC write or fsync()), or if our 7021d3576fdSSage Weil * cap is being revoked. 7031d3576fdSSage Weil */ 7041d3576fdSSage Weil do_sync = wbc->sync_mode == WB_SYNC_ALL; 7051d3576fdSSage Weil if (ceph_caps_revoking(ci, CEPH_CAP_FILE_BUFFER)) 7061d3576fdSSage Weil do_sync = 1; 7071d3576fdSSage Weil dout("writepages_start %p dosync=%d (mode=%s)\n", 7081d3576fdSSage Weil inode, do_sync, 7091d3576fdSSage Weil wbc->sync_mode == WB_SYNC_NONE ? "NONE" : 7101d3576fdSSage Weil (wbc->sync_mode == WB_SYNC_ALL ? "ALL" : "HOLD")); 7111d3576fdSSage Weil 7123d14c5d2SYehuda Sadeh fsc = ceph_inode_to_client(inode); 7133d14c5d2SYehuda Sadeh if (fsc->mount_state == CEPH_MOUNT_SHUTDOWN) { 7141d3576fdSSage Weil pr_warning("writepage_start %p on forced umount\n", inode); 7151d3576fdSSage Weil return -EIO; /* we're in a forced umount, don't write! */ 7161d3576fdSSage Weil } 7173d14c5d2SYehuda Sadeh if (fsc->mount_options->wsize && fsc->mount_options->wsize < wsize) 7183d14c5d2SYehuda Sadeh wsize = fsc->mount_options->wsize; 7191d3576fdSSage Weil if (wsize < PAGE_CACHE_SIZE) 7201d3576fdSSage Weil wsize = PAGE_CACHE_SIZE; 7211d3576fdSSage Weil max_pages_ever = wsize >> PAGE_CACHE_SHIFT; 7221d3576fdSSage Weil 7231d3576fdSSage Weil pagevec_init(&pvec, 0); 7241d3576fdSSage Weil 7251d3576fdSSage Weil /* where to start/end? */ 7261d3576fdSSage Weil if (wbc->range_cyclic) { 7271d3576fdSSage Weil start = mapping->writeback_index; /* Start from prev offset */ 7281d3576fdSSage Weil end = -1; 7291d3576fdSSage Weil dout(" cyclic, start at %lu\n", start); 7301d3576fdSSage Weil } else { 7311d3576fdSSage Weil start = wbc->range_start >> PAGE_CACHE_SHIFT; 7321d3576fdSSage Weil end = wbc->range_end >> PAGE_CACHE_SHIFT; 7331d3576fdSSage Weil if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) 7341d3576fdSSage Weil range_whole = 1; 7351d3576fdSSage Weil should_loop = 0; 7361d3576fdSSage Weil dout(" not cyclic, %lu to %lu\n", start, end); 7371d3576fdSSage Weil } 7381d3576fdSSage Weil index = start; 7391d3576fdSSage Weil 7401d3576fdSSage Weil retry: 7411d3576fdSSage Weil /* find oldest snap context with dirty data */ 7421d3576fdSSage Weil ceph_put_snap_context(snapc); 7431d3576fdSSage Weil snapc = get_oldest_context(inode, &snap_size); 7441d3576fdSSage Weil if (!snapc) { 7451d3576fdSSage Weil /* hmm, why does writepages get called when there 7461d3576fdSSage Weil is no dirty data? */ 7471d3576fdSSage Weil dout(" no snap context with dirty data?\n"); 7481d3576fdSSage Weil goto out; 7491d3576fdSSage Weil } 7501d3576fdSSage Weil dout(" oldest snapc is %p seq %lld (%d snaps)\n", 7511d3576fdSSage Weil snapc, snapc->seq, snapc->num_snaps); 7521d3576fdSSage Weil if (last_snapc && snapc != last_snapc) { 7531d3576fdSSage Weil /* if we switched to a newer snapc, restart our scan at the 7541d3576fdSSage Weil * start of the original file range. */ 7551d3576fdSSage Weil dout(" snapc differs from last pass, restarting at %lu\n", 7561d3576fdSSage Weil index); 7571d3576fdSSage Weil index = start; 7581d3576fdSSage Weil } 7591d3576fdSSage Weil last_snapc = snapc; 7601d3576fdSSage Weil 7611d3576fdSSage Weil while (!done && index <= end) { 762acead002SAlex Elder struct ceph_osd_req_op ops[2]; 7631d3576fdSSage Weil unsigned i; 7641d3576fdSSage Weil int first; 7651d3576fdSSage Weil pgoff_t next; 7661d3576fdSSage Weil int pvec_pages, locked_pages; 7671d3576fdSSage Weil struct page *page; 7681d3576fdSSage Weil int want; 7691d3576fdSSage Weil u64 offset, len; 7702baba250SYehuda Sadeh long writeback_stat; 7711d3576fdSSage Weil 7721d3576fdSSage Weil next = 0; 7731d3576fdSSage Weil locked_pages = 0; 7741d3576fdSSage Weil max_pages = max_pages_ever; 7751d3576fdSSage Weil 7761d3576fdSSage Weil get_more_pages: 7771d3576fdSSage Weil first = -1; 7781d3576fdSSage Weil want = min(end - index, 7791d3576fdSSage Weil min((pgoff_t)PAGEVEC_SIZE, 7801d3576fdSSage Weil max_pages - (pgoff_t)locked_pages) - 1) 7811d3576fdSSage Weil + 1; 7821d3576fdSSage Weil pvec_pages = pagevec_lookup_tag(&pvec, mapping, &index, 7831d3576fdSSage Weil PAGECACHE_TAG_DIRTY, 7841d3576fdSSage Weil want); 7851d3576fdSSage Weil dout("pagevec_lookup_tag got %d\n", pvec_pages); 7861d3576fdSSage Weil if (!pvec_pages && !locked_pages) 7871d3576fdSSage Weil break; 7881d3576fdSSage Weil for (i = 0; i < pvec_pages && locked_pages < max_pages; i++) { 7891d3576fdSSage Weil page = pvec.pages[i]; 7901d3576fdSSage Weil dout("? %p idx %lu\n", page, page->index); 7911d3576fdSSage Weil if (locked_pages == 0) 7921d3576fdSSage Weil lock_page(page); /* first page */ 7931d3576fdSSage Weil else if (!trylock_page(page)) 7941d3576fdSSage Weil break; 7951d3576fdSSage Weil 7961d3576fdSSage Weil /* only dirty pages, or our accounting breaks */ 7971d3576fdSSage Weil if (unlikely(!PageDirty(page)) || 7981d3576fdSSage Weil unlikely(page->mapping != mapping)) { 7991d3576fdSSage Weil dout("!dirty or !mapping %p\n", page); 8001d3576fdSSage Weil unlock_page(page); 8011d3576fdSSage Weil break; 8021d3576fdSSage Weil } 8031d3576fdSSage Weil if (!wbc->range_cyclic && page->index > end) { 8041d3576fdSSage Weil dout("end of range %p\n", page); 8051d3576fdSSage Weil done = 1; 8061d3576fdSSage Weil unlock_page(page); 8071d3576fdSSage Weil break; 8081d3576fdSSage Weil } 8091d3576fdSSage Weil if (next && (page->index != next)) { 8101d3576fdSSage Weil dout("not consecutive %p\n", page); 8111d3576fdSSage Weil unlock_page(page); 8121d3576fdSSage Weil break; 8131d3576fdSSage Weil } 8141d3576fdSSage Weil if (wbc->sync_mode != WB_SYNC_NONE) { 8151d3576fdSSage Weil dout("waiting on writeback %p\n", page); 8161d3576fdSSage Weil wait_on_page_writeback(page); 8171d3576fdSSage Weil } 8181d3576fdSSage Weil if ((snap_size && page_offset(page) > snap_size) || 8191d3576fdSSage Weil (!snap_size && 8201d3576fdSSage Weil page_offset(page) > i_size_read(inode))) { 8211d3576fdSSage Weil dout("%p page eof %llu\n", page, snap_size ? 8221d3576fdSSage Weil snap_size : i_size_read(inode)); 8231d3576fdSSage Weil done = 1; 8241d3576fdSSage Weil unlock_page(page); 8251d3576fdSSage Weil break; 8261d3576fdSSage Weil } 8271d3576fdSSage Weil if (PageWriteback(page)) { 8281d3576fdSSage Weil dout("%p under writeback\n", page); 8291d3576fdSSage Weil unlock_page(page); 8301d3576fdSSage Weil break; 8311d3576fdSSage Weil } 8321d3576fdSSage Weil 8331d3576fdSSage Weil /* only if matching snap context */ 83461600ef8SYan, Zheng pgsnapc = page_snap_context(page); 83580e755feSSage Weil if (pgsnapc->seq > snapc->seq) { 83680e755feSSage Weil dout("page snapc %p %lld > oldest %p %lld\n", 83780e755feSSage Weil pgsnapc, pgsnapc->seq, snapc, snapc->seq); 8381d3576fdSSage Weil unlock_page(page); 8391d3576fdSSage Weil if (!locked_pages) 8401d3576fdSSage Weil continue; /* keep looking for snap */ 8411d3576fdSSage Weil break; 8421d3576fdSSage Weil } 8431d3576fdSSage Weil 8441d3576fdSSage Weil if (!clear_page_dirty_for_io(page)) { 8451d3576fdSSage Weil dout("%p !clear_page_dirty_for_io\n", page); 8461d3576fdSSage Weil unlock_page(page); 8471d3576fdSSage Weil break; 8481d3576fdSSage Weil } 8491d3576fdSSage Weil 8501d3576fdSSage Weil /* ok */ 8511d3576fdSSage Weil if (locked_pages == 0) { 852acead002SAlex Elder struct ceph_vino vino; 853acead002SAlex Elder int num_ops = do_sync ? 2 : 1; 854acead002SAlex Elder 8551d3576fdSSage Weil /* prepare async write request */ 8566285bc23SAlex Elder offset = (u64) page_offset(page); 8571d3576fdSSage Weil len = wsize; 858*94fe8420SAlex Elder req = ceph_writepages_osd_request(inode, 859*94fe8420SAlex Elder offset, &len, snapc, 860*94fe8420SAlex Elder num_ops, ops); 8618c71897bSHenry C Chang 8626816282dSSage Weil if (IS_ERR(req)) { 8636816282dSSage Weil rc = PTR_ERR(req); 8648c71897bSHenry C Chang unlock_page(page); 8658c71897bSHenry C Chang break; 8668c71897bSHenry C Chang } 8678c71897bSHenry C Chang 868*94fe8420SAlex Elder vino = ceph_vino(inode); 869acead002SAlex Elder ceph_osdc_build_request(req, offset, 870acead002SAlex Elder num_ops, ops, snapc, vino.snap, 871acead002SAlex Elder &inode->i_mtime); 872acead002SAlex Elder 8730fff87ecSAlex Elder req->r_data_out.type = CEPH_OSD_DATA_TYPE_PAGES; 874e0c59487SAlex Elder req->r_data_out.length = len; 8750fff87ecSAlex Elder req->r_data_out.alignment = 0; 876e0c59487SAlex Elder max_pages = calc_pages_for(0, (u64)len); 8773d14c5d2SYehuda Sadeh alloc_page_vec(fsc, req); 8781d3576fdSSage Weil req->r_callback = writepages_finish; 8791d3576fdSSage Weil req->r_inode = inode; 8801d3576fdSSage Weil } 8811d3576fdSSage Weil 8821d3576fdSSage Weil /* note position of first page in pvec */ 8831d3576fdSSage Weil if (first < 0) 8841d3576fdSSage Weil first = i; 8851d3576fdSSage Weil dout("%p will write page %p idx %lu\n", 8861d3576fdSSage Weil inode, page, page->index); 8872baba250SYehuda Sadeh 888213c99eeSSage Weil writeback_stat = 8893d14c5d2SYehuda Sadeh atomic_long_inc_return(&fsc->writeback_count); 890213c99eeSSage Weil if (writeback_stat > CONGESTION_ON_THRESH( 8913d14c5d2SYehuda Sadeh fsc->mount_options->congestion_kb)) { 8923d14c5d2SYehuda Sadeh set_bdi_congested(&fsc->backing_dev_info, 893213c99eeSSage Weil BLK_RW_ASYNC); 8942baba250SYehuda Sadeh } 8952baba250SYehuda Sadeh 8961d3576fdSSage Weil set_page_writeback(page); 8970fff87ecSAlex Elder req->r_data_out.pages[locked_pages] = page; 8981d3576fdSSage Weil locked_pages++; 8991d3576fdSSage Weil next = page->index + 1; 9001d3576fdSSage Weil } 9011d3576fdSSage Weil 9021d3576fdSSage Weil /* did we get anything? */ 9031d3576fdSSage Weil if (!locked_pages) 9041d3576fdSSage Weil goto release_pvec_pages; 9051d3576fdSSage Weil if (i) { 9061d3576fdSSage Weil int j; 9071d3576fdSSage Weil BUG_ON(!locked_pages || first < 0); 9081d3576fdSSage Weil 9091d3576fdSSage Weil if (pvec_pages && i == pvec_pages && 9101d3576fdSSage Weil locked_pages < max_pages) { 9111d3576fdSSage Weil dout("reached end pvec, trying for more\n"); 9121d3576fdSSage Weil pagevec_reinit(&pvec); 9131d3576fdSSage Weil goto get_more_pages; 9141d3576fdSSage Weil } 9151d3576fdSSage Weil 9161d3576fdSSage Weil /* shift unused pages over in the pvec... we 9171d3576fdSSage Weil * will need to release them below. */ 9181d3576fdSSage Weil for (j = i; j < pvec_pages; j++) { 9191d3576fdSSage Weil dout(" pvec leftover page %p\n", 9201d3576fdSSage Weil pvec.pages[j]); 9211d3576fdSSage Weil pvec.pages[j-i+first] = pvec.pages[j]; 9221d3576fdSSage Weil } 9231d3576fdSSage Weil pvec.nr -= i-first; 9241d3576fdSSage Weil } 9251d3576fdSSage Weil 9261d3576fdSSage Weil /* submit the write */ 92725d71cb9SAlex Elder offset = page_offset(req->r_data_out.pages[0]); 9281d3576fdSSage Weil len = min((snap_size ? snap_size : i_size_read(inode)) - offset, 9291d3576fdSSage Weil (u64)locked_pages << PAGE_CACHE_SHIFT); 9301d3576fdSSage Weil dout("writepages got %d pages at %llu~%llu\n", 9311d3576fdSSage Weil locked_pages, offset, len); 9321d3576fdSSage Weil 9331d3576fdSSage Weil /* revise final length, page count */ 934e0c59487SAlex Elder req->r_data_out.length = len; 9351b83bef2SSage Weil req->r_request_ops[0].extent.length = cpu_to_le64(len); 9361b83bef2SSage Weil req->r_request_ops[0].payload_len = cpu_to_le32(len); 9371d3576fdSSage Weil req->r_request->hdr.data_len = cpu_to_le32(len); 9381d3576fdSSage Weil 9399d6fcb08SSage Weil rc = ceph_osdc_start_request(&fsc->client->osdc, req, true); 9409d6fcb08SSage Weil BUG_ON(rc); 9411d3576fdSSage Weil req = NULL; 9421d3576fdSSage Weil 9431d3576fdSSage Weil /* continue? */ 9441d3576fdSSage Weil index = next; 9451d3576fdSSage Weil wbc->nr_to_write -= locked_pages; 9461d3576fdSSage Weil if (wbc->nr_to_write <= 0) 9471d3576fdSSage Weil done = 1; 9481d3576fdSSage Weil 9491d3576fdSSage Weil release_pvec_pages: 9501d3576fdSSage Weil dout("pagevec_release on %d pages (%p)\n", (int)pvec.nr, 9511d3576fdSSage Weil pvec.nr ? pvec.pages[0] : NULL); 9521d3576fdSSage Weil pagevec_release(&pvec); 9531d3576fdSSage Weil 9541d3576fdSSage Weil if (locked_pages && !done) 9551d3576fdSSage Weil goto retry; 9561d3576fdSSage Weil } 9571d3576fdSSage Weil 9581d3576fdSSage Weil if (should_loop && !done) { 9591d3576fdSSage Weil /* more to do; loop back to beginning of file */ 9601d3576fdSSage Weil dout("writepages looping back to beginning of file\n"); 9611d3576fdSSage Weil should_loop = 0; 9621d3576fdSSage Weil index = 0; 9631d3576fdSSage Weil goto retry; 9641d3576fdSSage Weil } 9651d3576fdSSage Weil 9661d3576fdSSage Weil if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) 9671d3576fdSSage Weil mapping->writeback_index = index; 9681d3576fdSSage Weil 9691d3576fdSSage Weil out: 9701d3576fdSSage Weil if (req) 9711d3576fdSSage Weil ceph_osdc_put_request(req); 9721d3576fdSSage Weil ceph_put_snap_context(snapc); 9731d3576fdSSage Weil dout("writepages done, rc = %d\n", rc); 9741d3576fdSSage Weil return rc; 9751d3576fdSSage Weil } 9761d3576fdSSage Weil 9771d3576fdSSage Weil 9781d3576fdSSage Weil 9791d3576fdSSage Weil /* 9801d3576fdSSage Weil * See if a given @snapc is either writeable, or already written. 9811d3576fdSSage Weil */ 9821d3576fdSSage Weil static int context_is_writeable_or_written(struct inode *inode, 9831d3576fdSSage Weil struct ceph_snap_context *snapc) 9841d3576fdSSage Weil { 9851d3576fdSSage Weil struct ceph_snap_context *oldest = get_oldest_context(inode, NULL); 9866298a337SSage Weil int ret = !oldest || snapc->seq <= oldest->seq; 9876298a337SSage Weil 9886298a337SSage Weil ceph_put_snap_context(oldest); 9896298a337SSage Weil return ret; 9901d3576fdSSage Weil } 9911d3576fdSSage Weil 9921d3576fdSSage Weil /* 9931d3576fdSSage Weil * We are only allowed to write into/dirty the page if the page is 9941d3576fdSSage Weil * clean, or already dirty within the same snap context. 9958f883c24SSage Weil * 9968f883c24SSage Weil * called with page locked. 9978f883c24SSage Weil * return success with page locked, 9988f883c24SSage Weil * or any failure (incl -EAGAIN) with page unlocked. 9991d3576fdSSage Weil */ 10004af6b225SYehuda Sadeh static int ceph_update_writeable_page(struct file *file, 10014af6b225SYehuda Sadeh loff_t pos, unsigned len, 10024af6b225SYehuda Sadeh struct page *page) 10031d3576fdSSage Weil { 1004496ad9aaSAl Viro struct inode *inode = file_inode(file); 10051d3576fdSSage Weil struct ceph_inode_info *ci = ceph_inode(inode); 10063d14c5d2SYehuda Sadeh struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc; 10071d3576fdSSage Weil loff_t page_off = pos & PAGE_CACHE_MASK; 10081d3576fdSSage Weil int pos_in_page = pos & ~PAGE_CACHE_MASK; 10091d3576fdSSage Weil int end_in_page = pos_in_page + len; 10101d3576fdSSage Weil loff_t i_size; 10111d3576fdSSage Weil int r; 101280e755feSSage Weil struct ceph_snap_context *snapc, *oldest; 10131d3576fdSSage Weil 10141d3576fdSSage Weil retry_locked: 10151d3576fdSSage Weil /* writepages currently holds page lock, but if we change that later, */ 10161d3576fdSSage Weil wait_on_page_writeback(page); 10171d3576fdSSage Weil 10181d3576fdSSage Weil /* check snap context */ 10191d3576fdSSage Weil BUG_ON(!ci->i_snap_realm); 10201d3576fdSSage Weil down_read(&mdsc->snap_rwsem); 10211d3576fdSSage Weil BUG_ON(!ci->i_snap_realm->cached_context); 102261600ef8SYan, Zheng snapc = page_snap_context(page); 102380e755feSSage Weil if (snapc && snapc != ci->i_head_snapc) { 10241d3576fdSSage Weil /* 10251d3576fdSSage Weil * this page is already dirty in another (older) snap 10261d3576fdSSage Weil * context! is it writeable now? 10271d3576fdSSage Weil */ 102880e755feSSage Weil oldest = get_oldest_context(inode, NULL); 10291d3576fdSSage Weil up_read(&mdsc->snap_rwsem); 10301d3576fdSSage Weil 103180e755feSSage Weil if (snapc->seq > oldest->seq) { 10326298a337SSage Weil ceph_put_snap_context(oldest); 10331d3576fdSSage Weil dout(" page %p snapc %p not current or oldest\n", 10346298a337SSage Weil page, snapc); 10351d3576fdSSage Weil /* 10361d3576fdSSage Weil * queue for writeback, and wait for snapc to 10371d3576fdSSage Weil * be writeable or written 10381d3576fdSSage Weil */ 10396298a337SSage Weil snapc = ceph_get_snap_context(snapc); 10401d3576fdSSage Weil unlock_page(page); 10413c6f6b79SSage Weil ceph_queue_writeback(inode); 10428f883c24SSage Weil r = wait_event_interruptible(ci->i_cap_wq, 10431d3576fdSSage Weil context_is_writeable_or_written(inode, snapc)); 10441d3576fdSSage Weil ceph_put_snap_context(snapc); 10458f883c24SSage Weil if (r == -ERESTARTSYS) 10468f883c24SSage Weil return r; 10474af6b225SYehuda Sadeh return -EAGAIN; 10481d3576fdSSage Weil } 10496298a337SSage Weil ceph_put_snap_context(oldest); 10501d3576fdSSage Weil 10511d3576fdSSage Weil /* yay, writeable, do it now (without dropping page lock) */ 10521d3576fdSSage Weil dout(" page %p snapc %p not current, but oldest\n", 10531d3576fdSSage Weil page, snapc); 10541d3576fdSSage Weil if (!clear_page_dirty_for_io(page)) 10551d3576fdSSage Weil goto retry_locked; 10561d3576fdSSage Weil r = writepage_nounlock(page, NULL); 10571d3576fdSSage Weil if (r < 0) 10581d3576fdSSage Weil goto fail_nosnap; 10591d3576fdSSage Weil goto retry_locked; 10601d3576fdSSage Weil } 10611d3576fdSSage Weil 10621d3576fdSSage Weil if (PageUptodate(page)) { 10631d3576fdSSage Weil dout(" page %p already uptodate\n", page); 10641d3576fdSSage Weil return 0; 10651d3576fdSSage Weil } 10661d3576fdSSage Weil 10671d3576fdSSage Weil /* full page? */ 10681d3576fdSSage Weil if (pos_in_page == 0 && len == PAGE_CACHE_SIZE) 10691d3576fdSSage Weil return 0; 10701d3576fdSSage Weil 10711d3576fdSSage Weil /* past end of file? */ 10721d3576fdSSage Weil i_size = inode->i_size; /* caller holds i_mutex */ 10731d3576fdSSage Weil 10741d3576fdSSage Weil if (i_size + len > inode->i_sb->s_maxbytes) { 10751d3576fdSSage Weil /* file is too big */ 10761d3576fdSSage Weil r = -EINVAL; 10771d3576fdSSage Weil goto fail; 10781d3576fdSSage Weil } 10791d3576fdSSage Weil 10801d3576fdSSage Weil if (page_off >= i_size || 10811d3576fdSSage Weil (pos_in_page == 0 && (pos+len) >= i_size && 10821d3576fdSSage Weil end_in_page - pos_in_page != PAGE_CACHE_SIZE)) { 10831d3576fdSSage Weil dout(" zeroing %p 0 - %d and %d - %d\n", 10841d3576fdSSage Weil page, pos_in_page, end_in_page, (int)PAGE_CACHE_SIZE); 10851d3576fdSSage Weil zero_user_segments(page, 10861d3576fdSSage Weil 0, pos_in_page, 10871d3576fdSSage Weil end_in_page, PAGE_CACHE_SIZE); 10881d3576fdSSage Weil return 0; 10891d3576fdSSage Weil } 10901d3576fdSSage Weil 10911d3576fdSSage Weil /* we need to read it. */ 10921d3576fdSSage Weil up_read(&mdsc->snap_rwsem); 10931d3576fdSSage Weil r = readpage_nounlock(file, page); 10941d3576fdSSage Weil if (r < 0) 10951d3576fdSSage Weil goto fail_nosnap; 10961d3576fdSSage Weil goto retry_locked; 10971d3576fdSSage Weil 10981d3576fdSSage Weil fail: 10991d3576fdSSage Weil up_read(&mdsc->snap_rwsem); 11001d3576fdSSage Weil fail_nosnap: 11011d3576fdSSage Weil unlock_page(page); 11021d3576fdSSage Weil return r; 11031d3576fdSSage Weil } 11041d3576fdSSage Weil 11051d3576fdSSage Weil /* 11064af6b225SYehuda Sadeh * We are only allowed to write into/dirty the page if the page is 11074af6b225SYehuda Sadeh * clean, or already dirty within the same snap context. 11084af6b225SYehuda Sadeh */ 11094af6b225SYehuda Sadeh static int ceph_write_begin(struct file *file, struct address_space *mapping, 11104af6b225SYehuda Sadeh loff_t pos, unsigned len, unsigned flags, 11114af6b225SYehuda Sadeh struct page **pagep, void **fsdata) 11124af6b225SYehuda Sadeh { 1113496ad9aaSAl Viro struct inode *inode = file_inode(file); 11144af6b225SYehuda Sadeh struct page *page; 11154af6b225SYehuda Sadeh pgoff_t index = pos >> PAGE_CACHE_SHIFT; 11167971bd92SSage Weil int r; 11174af6b225SYehuda Sadeh 11184af6b225SYehuda Sadeh do { 11194af6b225SYehuda Sadeh /* get a page */ 11204af6b225SYehuda Sadeh page = grab_cache_page_write_begin(mapping, index, 0); 11217971bd92SSage Weil if (!page) 11227971bd92SSage Weil return -ENOMEM; 11237971bd92SSage Weil *pagep = page; 11244af6b225SYehuda Sadeh 11254af6b225SYehuda Sadeh dout("write_begin file %p inode %p page %p %d~%d\n", file, 11264af6b225SYehuda Sadeh inode, page, (int)pos, (int)len); 11274af6b225SYehuda Sadeh 11284af6b225SYehuda Sadeh r = ceph_update_writeable_page(file, pos, len, page); 11294af6b225SYehuda Sadeh } while (r == -EAGAIN); 11304af6b225SYehuda Sadeh 11314af6b225SYehuda Sadeh return r; 11324af6b225SYehuda Sadeh } 11334af6b225SYehuda Sadeh 11344af6b225SYehuda Sadeh /* 11351d3576fdSSage Weil * we don't do anything in here that simple_write_end doesn't do 11361d3576fdSSage Weil * except adjust dirty page accounting and drop read lock on 11371d3576fdSSage Weil * mdsc->snap_rwsem. 11381d3576fdSSage Weil */ 11391d3576fdSSage Weil static int ceph_write_end(struct file *file, struct address_space *mapping, 11401d3576fdSSage Weil loff_t pos, unsigned len, unsigned copied, 11411d3576fdSSage Weil struct page *page, void *fsdata) 11421d3576fdSSage Weil { 1143496ad9aaSAl Viro struct inode *inode = file_inode(file); 11443d14c5d2SYehuda Sadeh struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 11453d14c5d2SYehuda Sadeh struct ceph_mds_client *mdsc = fsc->mdsc; 11461d3576fdSSage Weil unsigned from = pos & (PAGE_CACHE_SIZE - 1); 11471d3576fdSSage Weil int check_cap = 0; 11481d3576fdSSage Weil 11491d3576fdSSage Weil dout("write_end file %p inode %p page %p %d~%d (%d)\n", file, 11501d3576fdSSage Weil inode, page, (int)pos, (int)copied, (int)len); 11511d3576fdSSage Weil 11521d3576fdSSage Weil /* zero the stale part of the page if we did a short copy */ 11531d3576fdSSage Weil if (copied < len) 11541d3576fdSSage Weil zero_user_segment(page, from+copied, len); 11551d3576fdSSage Weil 11561d3576fdSSage Weil /* did file size increase? */ 11571d3576fdSSage Weil /* (no need for i_size_read(); we caller holds i_mutex */ 11581d3576fdSSage Weil if (pos+copied > inode->i_size) 11591d3576fdSSage Weil check_cap = ceph_inode_set_size(inode, pos+copied); 11601d3576fdSSage Weil 11611d3576fdSSage Weil if (!PageUptodate(page)) 11621d3576fdSSage Weil SetPageUptodate(page); 11631d3576fdSSage Weil 11641d3576fdSSage Weil set_page_dirty(page); 11651d3576fdSSage Weil 11661d3576fdSSage Weil unlock_page(page); 11671d3576fdSSage Weil up_read(&mdsc->snap_rwsem); 11681d3576fdSSage Weil page_cache_release(page); 11691d3576fdSSage Weil 11701d3576fdSSage Weil if (check_cap) 11711d3576fdSSage Weil ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY, NULL); 11721d3576fdSSage Weil 11731d3576fdSSage Weil return copied; 11741d3576fdSSage Weil } 11751d3576fdSSage Weil 11761d3576fdSSage Weil /* 11771d3576fdSSage Weil * we set .direct_IO to indicate direct io is supported, but since we 11781d3576fdSSage Weil * intercept O_DIRECT reads and writes early, this function should 11791d3576fdSSage Weil * never get called. 11801d3576fdSSage Weil */ 11811d3576fdSSage Weil static ssize_t ceph_direct_io(int rw, struct kiocb *iocb, 11821d3576fdSSage Weil const struct iovec *iov, 11831d3576fdSSage Weil loff_t pos, unsigned long nr_segs) 11841d3576fdSSage Weil { 11851d3576fdSSage Weil WARN_ON(1); 11861d3576fdSSage Weil return -EINVAL; 11871d3576fdSSage Weil } 11881d3576fdSSage Weil 11891d3576fdSSage Weil const struct address_space_operations ceph_aops = { 11901d3576fdSSage Weil .readpage = ceph_readpage, 11911d3576fdSSage Weil .readpages = ceph_readpages, 11921d3576fdSSage Weil .writepage = ceph_writepage, 11931d3576fdSSage Weil .writepages = ceph_writepages_start, 11941d3576fdSSage Weil .write_begin = ceph_write_begin, 11951d3576fdSSage Weil .write_end = ceph_write_end, 11961d3576fdSSage Weil .set_page_dirty = ceph_set_page_dirty, 11971d3576fdSSage Weil .invalidatepage = ceph_invalidatepage, 11981d3576fdSSage Weil .releasepage = ceph_releasepage, 11991d3576fdSSage Weil .direct_IO = ceph_direct_io, 12001d3576fdSSage Weil }; 12011d3576fdSSage Weil 12021d3576fdSSage Weil 12031d3576fdSSage Weil /* 12041d3576fdSSage Weil * vm ops 12051d3576fdSSage Weil */ 12061d3576fdSSage Weil 12071d3576fdSSage Weil /* 12081d3576fdSSage Weil * Reuse write_begin here for simplicity. 12091d3576fdSSage Weil */ 12101d3576fdSSage Weil static int ceph_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) 12111d3576fdSSage Weil { 1212496ad9aaSAl Viro struct inode *inode = file_inode(vma->vm_file); 12131d3576fdSSage Weil struct page *page = vmf->page; 12143d14c5d2SYehuda Sadeh struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc; 12156285bc23SAlex Elder loff_t off = page_offset(page); 12161d3576fdSSage Weil loff_t size, len; 12171d3576fdSSage Weil int ret; 12181d3576fdSSage Weil 12193ca9c3bdSJan Kara /* Update time before taking page lock */ 12203ca9c3bdSJan Kara file_update_time(vma->vm_file); 12213ca9c3bdSJan Kara 12221d3576fdSSage Weil size = i_size_read(inode); 12231d3576fdSSage Weil if (off + PAGE_CACHE_SIZE <= size) 12241d3576fdSSage Weil len = PAGE_CACHE_SIZE; 12251d3576fdSSage Weil else 12261d3576fdSSage Weil len = size & ~PAGE_CACHE_MASK; 12271d3576fdSSage Weil 12281d3576fdSSage Weil dout("page_mkwrite %p %llu~%llu page %p idx %lu\n", inode, 12291d3576fdSSage Weil off, len, page, page->index); 12304af6b225SYehuda Sadeh 12314af6b225SYehuda Sadeh lock_page(page); 12324af6b225SYehuda Sadeh 12334af6b225SYehuda Sadeh ret = VM_FAULT_NOPAGE; 12344af6b225SYehuda Sadeh if ((off > size) || 12354af6b225SYehuda Sadeh (page->mapping != inode->i_mapping)) 12364af6b225SYehuda Sadeh goto out; 12374af6b225SYehuda Sadeh 12384af6b225SYehuda Sadeh ret = ceph_update_writeable_page(vma->vm_file, off, len, page); 12394af6b225SYehuda Sadeh if (ret == 0) { 12404af6b225SYehuda Sadeh /* success. we'll keep the page locked. */ 12411d3576fdSSage Weil set_page_dirty(page); 12421d3576fdSSage Weil up_read(&mdsc->snap_rwsem); 12431d3576fdSSage Weil ret = VM_FAULT_LOCKED; 12441d3576fdSSage Weil } else { 12454af6b225SYehuda Sadeh if (ret == -ENOMEM) 12464af6b225SYehuda Sadeh ret = VM_FAULT_OOM; 12474af6b225SYehuda Sadeh else 12481d3576fdSSage Weil ret = VM_FAULT_SIGBUS; 12491d3576fdSSage Weil } 12504af6b225SYehuda Sadeh out: 12511d3576fdSSage Weil dout("page_mkwrite %p %llu~%llu = %d\n", inode, off, len, ret); 12524af6b225SYehuda Sadeh if (ret != VM_FAULT_LOCKED) 12534af6b225SYehuda Sadeh unlock_page(page); 12541d3576fdSSage Weil return ret; 12551d3576fdSSage Weil } 12561d3576fdSSage Weil 12571d3576fdSSage Weil static struct vm_operations_struct ceph_vmops = { 12581d3576fdSSage Weil .fault = filemap_fault, 12591d3576fdSSage Weil .page_mkwrite = ceph_page_mkwrite, 12600b173bc4SKonstantin Khlebnikov .remap_pages = generic_file_remap_pages, 12611d3576fdSSage Weil }; 12621d3576fdSSage Weil 12631d3576fdSSage Weil int ceph_mmap(struct file *file, struct vm_area_struct *vma) 12641d3576fdSSage Weil { 12651d3576fdSSage Weil struct address_space *mapping = file->f_mapping; 12661d3576fdSSage Weil 12671d3576fdSSage Weil if (!mapping->a_ops->readpage) 12681d3576fdSSage Weil return -ENOEXEC; 12691d3576fdSSage Weil file_accessed(file); 12701d3576fdSSage Weil vma->vm_ops = &ceph_vmops; 12711d3576fdSSage Weil return 0; 12721d3576fdSSage Weil } 1273