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" 1499ccbd22SMilosz Tanski #include "cache.h" 153d14c5d2SYehuda Sadeh #include <linux/ceph/osd_client.h> 161d3576fdSSage Weil 171d3576fdSSage Weil /* 181d3576fdSSage Weil * Ceph address space ops. 191d3576fdSSage Weil * 201d3576fdSSage Weil * There are a few funny things going on here. 211d3576fdSSage Weil * 221d3576fdSSage Weil * The page->private field is used to reference a struct 231d3576fdSSage Weil * ceph_snap_context for _every_ dirty page. This indicates which 241d3576fdSSage Weil * snapshot the page was logically dirtied in, and thus which snap 251d3576fdSSage Weil * context needs to be associated with the osd write during writeback. 261d3576fdSSage Weil * 271d3576fdSSage Weil * Similarly, struct ceph_inode_info maintains a set of counters to 2825985edcSLucas De Marchi * count dirty pages on the inode. In the absence of snapshots, 291d3576fdSSage Weil * i_wrbuffer_ref == i_wrbuffer_ref_head == the dirty page count. 301d3576fdSSage Weil * 311d3576fdSSage Weil * When a snapshot is taken (that is, when the client receives 321d3576fdSSage Weil * notification that a snapshot was taken), each inode with caps and 331d3576fdSSage Weil * with dirty pages (dirty pages implies there is a cap) gets a new 341d3576fdSSage Weil * ceph_cap_snap in the i_cap_snaps list (which is sorted in ascending 351d3576fdSSage Weil * order, new snaps go to the tail). The i_wrbuffer_ref_head count is 361d3576fdSSage Weil * moved to capsnap->dirty. (Unless a sync write is currently in 371d3576fdSSage Weil * progress. In that case, the capsnap is said to be "pending", new 381d3576fdSSage Weil * writes cannot start, and the capsnap isn't "finalized" until the 391d3576fdSSage Weil * write completes (or fails) and a final size/mtime for the inode for 401d3576fdSSage Weil * that snap can be settled upon.) i_wrbuffer_ref_head is reset to 0. 411d3576fdSSage Weil * 421d3576fdSSage Weil * On writeback, we must submit writes to the osd IN SNAP ORDER. So, 431d3576fdSSage Weil * we look for the first capsnap in i_cap_snaps and write out pages in 441d3576fdSSage Weil * that snap context _only_. Then we move on to the next capsnap, 451d3576fdSSage Weil * eventually reaching the "live" or "head" context (i.e., pages that 461d3576fdSSage Weil * are not yet snapped) and are writing the most recently dirtied 471d3576fdSSage Weil * pages. 481d3576fdSSage Weil * 491d3576fdSSage Weil * Invalidate and so forth must take care to ensure the dirty page 501d3576fdSSage Weil * accounting is preserved. 511d3576fdSSage Weil */ 521d3576fdSSage Weil 532baba250SYehuda Sadeh #define CONGESTION_ON_THRESH(congestion_kb) (congestion_kb >> (PAGE_SHIFT-10)) 542baba250SYehuda Sadeh #define CONGESTION_OFF_THRESH(congestion_kb) \ 552baba250SYehuda Sadeh (CONGESTION_ON_THRESH(congestion_kb) - \ 562baba250SYehuda Sadeh (CONGESTION_ON_THRESH(congestion_kb) >> 2)) 572baba250SYehuda Sadeh 5861600ef8SYan, Zheng static inline struct ceph_snap_context *page_snap_context(struct page *page) 5961600ef8SYan, Zheng { 6061600ef8SYan, Zheng if (PagePrivate(page)) 6161600ef8SYan, Zheng return (void *)page->private; 6261600ef8SYan, Zheng return NULL; 6361600ef8SYan, Zheng } 641d3576fdSSage Weil 651d3576fdSSage Weil /* 661d3576fdSSage Weil * Dirty a page. Optimistically adjust accounting, on the assumption 671d3576fdSSage Weil * that we won't race with invalidate. If we do, readjust. 681d3576fdSSage Weil */ 691d3576fdSSage Weil static int ceph_set_page_dirty(struct page *page) 701d3576fdSSage Weil { 711d3576fdSSage Weil struct address_space *mapping = page->mapping; 721d3576fdSSage Weil struct inode *inode; 731d3576fdSSage Weil struct ceph_inode_info *ci; 741d3576fdSSage Weil struct ceph_snap_context *snapc; 757d6e1f54SSha Zhengju int ret; 761d3576fdSSage Weil 771d3576fdSSage Weil if (unlikely(!mapping)) 781d3576fdSSage Weil return !TestSetPageDirty(page); 791d3576fdSSage Weil 807d6e1f54SSha Zhengju if (PageDirty(page)) { 811d3576fdSSage Weil dout("%p set_page_dirty %p idx %lu -- already dirty\n", 821d3576fdSSage Weil mapping->host, page, page->index); 837d6e1f54SSha Zhengju BUG_ON(!PagePrivate(page)); 841d3576fdSSage Weil return 0; 851d3576fdSSage Weil } 861d3576fdSSage Weil 871d3576fdSSage Weil inode = mapping->host; 881d3576fdSSage Weil ci = ceph_inode(inode); 891d3576fdSSage Weil 901d3576fdSSage Weil /* dirty the head */ 91be655596SSage Weil spin_lock(&ci->i_ceph_lock); 925dda377cSYan, Zheng BUG_ON(ci->i_wr_ref == 0); // caller should hold Fw reference 935dda377cSYan, Zheng if (__ceph_have_pending_cap_snap(ci)) { 945dda377cSYan, Zheng struct ceph_cap_snap *capsnap = 955dda377cSYan, Zheng list_last_entry(&ci->i_cap_snaps, 965dda377cSYan, Zheng struct ceph_cap_snap, 975dda377cSYan, Zheng ci_item); 985dda377cSYan, Zheng snapc = ceph_get_snap_context(capsnap->context); 995dda377cSYan, Zheng capsnap->dirty_pages++; 1005dda377cSYan, Zheng } else { 1015dda377cSYan, Zheng BUG_ON(!ci->i_head_snapc); 1025dda377cSYan, Zheng snapc = ceph_get_snap_context(ci->i_head_snapc); 1031d3576fdSSage Weil ++ci->i_wrbuffer_ref_head; 1045dda377cSYan, Zheng } 1051d3576fdSSage Weil if (ci->i_wrbuffer_ref == 0) 1060444d76aSDave Chinner ihold(inode); 1071d3576fdSSage Weil ++ci->i_wrbuffer_ref; 1081d3576fdSSage Weil dout("%p set_page_dirty %p idx %lu head %d/%d -> %d/%d " 1091d3576fdSSage Weil "snapc %p seq %lld (%d snaps)\n", 1101d3576fdSSage Weil mapping->host, page, page->index, 1111d3576fdSSage Weil ci->i_wrbuffer_ref-1, ci->i_wrbuffer_ref_head-1, 1121d3576fdSSage Weil ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head, 1131d3576fdSSage Weil snapc, snapc->seq, snapc->num_snaps); 114be655596SSage Weil spin_unlock(&ci->i_ceph_lock); 1151d3576fdSSage Weil 1161d3576fdSSage Weil /* 1171d3576fdSSage Weil * Reference snap context in page->private. Also set 1181d3576fdSSage Weil * PagePrivate so that we get invalidatepage callback. 1191d3576fdSSage Weil */ 1207d6e1f54SSha Zhengju BUG_ON(PagePrivate(page)); 1211d3576fdSSage Weil page->private = (unsigned long)snapc; 1221d3576fdSSage Weil SetPagePrivate(page); 1231d3576fdSSage Weil 1247d6e1f54SSha Zhengju ret = __set_page_dirty_nobuffers(page); 1257d6e1f54SSha Zhengju WARN_ON(!PageLocked(page)); 1267d6e1f54SSha Zhengju WARN_ON(!page->mapping); 1271d3576fdSSage Weil 1287d6e1f54SSha Zhengju return ret; 1291d3576fdSSage Weil } 1301d3576fdSSage Weil 1311d3576fdSSage Weil /* 1321d3576fdSSage Weil * If we are truncating the full page (i.e. offset == 0), adjust the 1331d3576fdSSage Weil * dirty page counters appropriately. Only called if there is private 1341d3576fdSSage Weil * data on the page. 1351d3576fdSSage Weil */ 136d47992f8SLukas Czerner static void ceph_invalidatepage(struct page *page, unsigned int offset, 137d47992f8SLukas Czerner unsigned int length) 1381d3576fdSSage Weil { 1394ce1e9adSAlexander Beregalov struct inode *inode; 1401d3576fdSSage Weil struct ceph_inode_info *ci; 14161600ef8SYan, Zheng struct ceph_snap_context *snapc = page_snap_context(page); 1421d3576fdSSage Weil 1434ce1e9adSAlexander Beregalov inode = page->mapping->host; 144b150f5c1SMilosz Tanski ci = ceph_inode(inode); 145b150f5c1SMilosz Tanski 14609cbfeafSKirill A. Shutemov if (offset != 0 || length != PAGE_SIZE) { 147b150f5c1SMilosz Tanski dout("%p invalidatepage %p idx %lu partial dirty page %u~%u\n", 148b150f5c1SMilosz Tanski inode, page, page->index, offset, length); 149b150f5c1SMilosz Tanski return; 150b150f5c1SMilosz Tanski } 1514ce1e9adSAlexander Beregalov 15299ccbd22SMilosz Tanski ceph_invalidate_fscache_page(inode, page); 15399ccbd22SMilosz Tanski 15499ccbd22SMilosz Tanski if (!PagePrivate(page)) 15599ccbd22SMilosz Tanski return; 15699ccbd22SMilosz Tanski 1571d3576fdSSage Weil /* 1581d3576fdSSage Weil * We can get non-dirty pages here due to races between 1591d3576fdSSage Weil * set_page_dirty and truncate_complete_page; just spit out a 1601d3576fdSSage Weil * warning, in case we end up with accounting problems later. 1611d3576fdSSage Weil */ 1621d3576fdSSage Weil if (!PageDirty(page)) 1631d3576fdSSage Weil pr_err("%p invalidatepage %p page not dirty\n", inode, page); 1641d3576fdSSage Weil 1651d3576fdSSage Weil ClearPageChecked(page); 1661d3576fdSSage Weil 167569d39fcSLukas Czerner dout("%p invalidatepage %p idx %lu full dirty page\n", 168569d39fcSLukas Czerner inode, page, page->index); 169b150f5c1SMilosz Tanski 1701d3576fdSSage Weil ceph_put_wrbuffer_cap_refs(ci, 1, snapc); 1711d3576fdSSage Weil ceph_put_snap_context(snapc); 1721d3576fdSSage Weil page->private = 0; 1731d3576fdSSage Weil ClearPagePrivate(page); 1741d3576fdSSage Weil } 1751d3576fdSSage Weil 1761d3576fdSSage Weil static int ceph_releasepage(struct page *page, gfp_t g) 1771d3576fdSSage Weil { 178e55f1a18SNeilBrown dout("%p releasepage %p idx %lu (%sdirty)\n", page->mapping->host, 179e55f1a18SNeilBrown page, page->index, PageDirty(page) ? "" : "not "); 18099ccbd22SMilosz Tanski 18199ccbd22SMilosz Tanski /* Can we release the page from the cache? */ 18299ccbd22SMilosz Tanski if (!ceph_release_fscache_page(page, g)) 1831d3576fdSSage Weil return 0; 18499ccbd22SMilosz Tanski 18599ccbd22SMilosz Tanski return !PagePrivate(page); 1861d3576fdSSage Weil } 1871d3576fdSSage Weil 1881d3576fdSSage Weil /* 1891d3576fdSSage Weil * read a single page, without unlocking it. 1901d3576fdSSage Weil */ 1911d3576fdSSage Weil static int readpage_nounlock(struct file *filp, struct page *page) 1921d3576fdSSage Weil { 193496ad9aaSAl Viro struct inode *inode = file_inode(filp); 1941d3576fdSSage Weil struct ceph_inode_info *ci = ceph_inode(inode); 1953d14c5d2SYehuda Sadeh struct ceph_osd_client *osdc = 1963d14c5d2SYehuda Sadeh &ceph_inode_to_client(inode)->client->osdc; 1971d3576fdSSage Weil int err = 0; 19883701246SYan, Zheng u64 off = page_offset(page); 19909cbfeafSKirill A. Shutemov u64 len = PAGE_SIZE; 2001d3576fdSSage Weil 20183701246SYan, Zheng if (off >= i_size_read(inode)) { 20209cbfeafSKirill A. Shutemov zero_user_segment(page, 0, PAGE_SIZE); 20383701246SYan, Zheng SetPageUptodate(page); 20483701246SYan, Zheng return 0; 20583701246SYan, Zheng } 20699ccbd22SMilosz Tanski 207fcc02d2aSYan, Zheng if (ci->i_inline_version != CEPH_INLINE_NONE) { 20883701246SYan, Zheng /* 209fcc02d2aSYan, Zheng * Uptodate inline data should have been added 210fcc02d2aSYan, Zheng * into page cache while getting Fcr caps. 21183701246SYan, Zheng */ 212fcc02d2aSYan, Zheng if (off == 0) 21383701246SYan, Zheng return -EINVAL; 21409cbfeafSKirill A. Shutemov zero_user_segment(page, 0, PAGE_SIZE); 215fcc02d2aSYan, Zheng SetPageUptodate(page); 216fcc02d2aSYan, Zheng return 0; 217fcc02d2aSYan, Zheng } 21883701246SYan, Zheng 21983701246SYan, Zheng err = ceph_readpage_from_fscache(inode, page); 22099ccbd22SMilosz Tanski if (err == 0) 22199ccbd22SMilosz Tanski goto out; 22299ccbd22SMilosz Tanski 2231d3576fdSSage Weil dout("readpage inode %p file %p page %p index %lu\n", 2241d3576fdSSage Weil inode, filp, page, page->index); 2251d3576fdSSage Weil err = ceph_osdc_readpages(osdc, ceph_vino(inode), &ci->i_layout, 22683701246SYan, Zheng off, &len, 2271d3576fdSSage Weil ci->i_truncate_seq, ci->i_truncate_size, 228b7495fc2SSage Weil &page, 1, 0); 2291d3576fdSSage Weil if (err == -ENOENT) 2301d3576fdSSage Weil err = 0; 2311d3576fdSSage Weil if (err < 0) { 2321d3576fdSSage Weil SetPageError(page); 23318302805SLi Wang ceph_fscache_readpage_cancel(inode, page); 2341d3576fdSSage Weil goto out; 23523cd573bSZhang Zhen } 23609cbfeafSKirill A. Shutemov if (err < PAGE_SIZE) 2371d3576fdSSage Weil /* zero fill remainder of page */ 23809cbfeafSKirill A. Shutemov zero_user_segment(page, err, PAGE_SIZE); 23923cd573bSZhang Zhen else 24056f91aadSLi Wang flush_dcache_page(page); 2411d3576fdSSage Weil 24223cd573bSZhang Zhen SetPageUptodate(page); 24399ccbd22SMilosz Tanski ceph_readpage_to_fscache(inode, page); 24499ccbd22SMilosz Tanski 2451d3576fdSSage Weil out: 2461d3576fdSSage Weil return err < 0 ? err : 0; 2471d3576fdSSage Weil } 2481d3576fdSSage Weil 2491d3576fdSSage Weil static int ceph_readpage(struct file *filp, struct page *page) 2501d3576fdSSage Weil { 2511d3576fdSSage Weil int r = readpage_nounlock(filp, page); 2521d3576fdSSage Weil unlock_page(page); 2531d3576fdSSage Weil return r; 2541d3576fdSSage Weil } 2551d3576fdSSage Weil 2561d3576fdSSage Weil /* 2577c272194SSage Weil * Finish an async read(ahead) op. 2581d3576fdSSage Weil */ 25985e084feSIlya Dryomov static void finish_read(struct ceph_osd_request *req) 2601d3576fdSSage Weil { 2617c272194SSage Weil struct inode *inode = req->r_inode; 26287060c10SAlex Elder struct ceph_osd_data *osd_data; 26385e084feSIlya Dryomov int rc = req->r_result <= 0 ? req->r_result : 0; 26485e084feSIlya Dryomov int bytes = req->r_result >= 0 ? req->r_result : 0; 265e0c59487SAlex Elder int num_pages; 2667c272194SSage Weil int i; 2677c272194SSage Weil 2687c272194SSage Weil dout("finish_read %p req %p rc %d bytes %d\n", inode, req, rc, bytes); 2697c272194SSage Weil 2707c272194SSage Weil /* unlock all pages, zeroing any data we didn't read */ 271406e2c9fSAlex Elder osd_data = osd_req_op_extent_osd_data(req, 0); 27287060c10SAlex Elder BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES); 27387060c10SAlex Elder num_pages = calc_pages_for((u64)osd_data->alignment, 27487060c10SAlex Elder (u64)osd_data->length); 275e0c59487SAlex Elder for (i = 0; i < num_pages; i++) { 27687060c10SAlex Elder struct page *page = osd_data->pages[i]; 2777c272194SSage Weil 278368e3585SYan, Zheng if (rc < 0 && rc != -ENOENT) { 279368e3585SYan, Zheng ceph_fscache_readpage_cancel(inode, page); 280f36132a7SLi Wang goto unlock; 281368e3585SYan, Zheng } 28209cbfeafSKirill A. Shutemov if (bytes < (int)PAGE_SIZE) { 2837c272194SSage Weil /* zero (remainder of) page */ 2847c272194SSage Weil int s = bytes < 0 ? 0 : bytes; 28509cbfeafSKirill A. Shutemov zero_user_segment(page, s, PAGE_SIZE); 2867c272194SSage Weil } 2877c272194SSage Weil dout("finish_read %p uptodate %p idx %lu\n", inode, page, 2887c272194SSage Weil page->index); 2897c272194SSage Weil flush_dcache_page(page); 2907c272194SSage Weil SetPageUptodate(page); 29199ccbd22SMilosz Tanski ceph_readpage_to_fscache(inode, page); 292f36132a7SLi Wang unlock: 2937c272194SSage Weil unlock_page(page); 29409cbfeafSKirill A. Shutemov put_page(page); 29509cbfeafSKirill A. Shutemov bytes -= PAGE_SIZE; 2967c272194SSage Weil } 29787060c10SAlex Elder kfree(osd_data->pages); 2987c272194SSage Weil } 2997c272194SSage Weil 3007c272194SSage Weil /* 3017c272194SSage Weil * start an async read(ahead) operation. return nr_pages we submitted 3027c272194SSage Weil * a read for on success, or negative error code. 3037c272194SSage Weil */ 3040d66a487SSage Weil static int start_read(struct inode *inode, struct list_head *page_list, int max) 3057c272194SSage Weil { 3067c272194SSage Weil struct ceph_osd_client *osdc = 3077c272194SSage Weil &ceph_inode_to_client(inode)->client->osdc; 3087c272194SSage Weil struct ceph_inode_info *ci = ceph_inode(inode); 3097c272194SSage Weil struct page *page = list_entry(page_list->prev, struct page, lru); 310acead002SAlex Elder struct ceph_vino vino; 3117c272194SSage Weil struct ceph_osd_request *req; 3127c272194SSage Weil u64 off; 3137c272194SSage Weil u64 len; 3147c272194SSage Weil int i; 3151d3576fdSSage Weil struct page **pages; 3167c272194SSage Weil pgoff_t next_index; 3177c272194SSage Weil int nr_pages = 0; 3182b1ac852SYan, Zheng int got = 0; 3192b1ac852SYan, Zheng int ret = 0; 3202b1ac852SYan, Zheng 3212b1ac852SYan, Zheng if (!current->journal_info) { 3222b1ac852SYan, Zheng /* caller of readpages does not hold buffer and read caps 3232b1ac852SYan, Zheng * (fadvise, madvise and readahead cases) */ 3242b1ac852SYan, Zheng int want = CEPH_CAP_FILE_CACHE; 3252b1ac852SYan, Zheng ret = ceph_try_get_caps(ci, CEPH_CAP_FILE_RD, want, &got); 3262b1ac852SYan, Zheng if (ret < 0) { 3272b1ac852SYan, Zheng dout("start_read %p, error getting cap\n", inode); 3282b1ac852SYan, Zheng } else if (!(got & want)) { 3292b1ac852SYan, Zheng dout("start_read %p, no cache cap\n", inode); 3302b1ac852SYan, Zheng ret = 0; 3312b1ac852SYan, Zheng } 3322b1ac852SYan, Zheng if (ret <= 0) { 3332b1ac852SYan, Zheng if (got) 3342b1ac852SYan, Zheng ceph_put_cap_refs(ci, got); 3352b1ac852SYan, Zheng while (!list_empty(page_list)) { 3362b1ac852SYan, Zheng page = list_entry(page_list->prev, 3372b1ac852SYan, Zheng struct page, lru); 3382b1ac852SYan, Zheng list_del(&page->lru); 3392b1ac852SYan, Zheng put_page(page); 3402b1ac852SYan, Zheng } 3412b1ac852SYan, Zheng return ret; 3422b1ac852SYan, Zheng } 3432b1ac852SYan, Zheng } 3447c272194SSage Weil 3456285bc23SAlex Elder off = (u64) page_offset(page); 3467c272194SSage Weil 3477c272194SSage Weil /* count pages */ 3487c272194SSage Weil next_index = page->index; 3497c272194SSage Weil list_for_each_entry_reverse(page, page_list, lru) { 3507c272194SSage Weil if (page->index != next_index) 3517c272194SSage Weil break; 3527c272194SSage Weil nr_pages++; 3537c272194SSage Weil next_index++; 3540d66a487SSage Weil if (max && nr_pages == max) 3550d66a487SSage Weil break; 3567c272194SSage Weil } 35709cbfeafSKirill A. Shutemov len = nr_pages << PAGE_SHIFT; 3587c272194SSage Weil dout("start_read %p nr_pages %d is %lld~%lld\n", inode, nr_pages, 3597c272194SSage Weil off, len); 360acead002SAlex Elder vino = ceph_vino(inode); 361acead002SAlex Elder req = ceph_osdc_new_request(osdc, &ci->i_layout, vino, off, &len, 362715e4cd4SYan, Zheng 0, 1, CEPH_OSD_OP_READ, 363acead002SAlex Elder CEPH_OSD_FLAG_READ, NULL, 3647c272194SSage Weil ci->i_truncate_seq, ci->i_truncate_size, 365acead002SAlex Elder false); 3662b1ac852SYan, Zheng if (IS_ERR(req)) { 3672b1ac852SYan, Zheng ret = PTR_ERR(req); 3682b1ac852SYan, Zheng goto out; 3692b1ac852SYan, Zheng } 3701d3576fdSSage Weil 3711d3576fdSSage Weil /* build page vector */ 372cf7b7e14SAlex Elder nr_pages = calc_pages_for(0, len); 373687265e5SYan, Zheng pages = kmalloc(sizeof(*pages) * nr_pages, GFP_KERNEL); 3742b1ac852SYan, Zheng if (!pages) { 3757c272194SSage Weil ret = -ENOMEM; 3762b1ac852SYan, Zheng goto out_put; 3772b1ac852SYan, Zheng } 3787c272194SSage Weil for (i = 0; i < nr_pages; ++i) { 3797c272194SSage Weil page = list_entry(page_list->prev, struct page, lru); 3807c272194SSage Weil BUG_ON(PageLocked(page)); 3817c272194SSage Weil list_del(&page->lru); 3821d3576fdSSage Weil 3837c272194SSage Weil dout("start_read %p adding %p idx %lu\n", inode, page, 3847c272194SSage Weil page->index); 3857c272194SSage Weil if (add_to_page_cache_lru(page, &inode->i_data, page->index, 386687265e5SYan, Zheng GFP_KERNEL)) { 387d4d3aa38SMilosz Tanski ceph_fscache_uncache_page(inode, page); 38809cbfeafSKirill A. Shutemov put_page(page); 3897c272194SSage Weil dout("start_read %p add_to_page_cache failed %p\n", 3907c272194SSage Weil inode, page); 3917c272194SSage Weil nr_pages = i; 3921afe4785SYan, Zheng if (nr_pages > 0) { 3931afe4785SYan, Zheng len = nr_pages << PAGE_SHIFT; 3941afe4785SYan, Zheng break; 3951afe4785SYan, Zheng } 3967c272194SSage Weil goto out_pages; 3971d3576fdSSage Weil } 3987c272194SSage Weil pages[i] = page; 3991d3576fdSSage Weil } 400406e2c9fSAlex Elder osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, false, false); 4017c272194SSage Weil req->r_callback = finish_read; 4027c272194SSage Weil req->r_inode = inode; 4037c272194SSage Weil 4047c272194SSage Weil dout("start_read %p starting %p %lld~%lld\n", inode, req, off, len); 4057c272194SSage Weil ret = ceph_osdc_start_request(osdc, req, false); 4067c272194SSage Weil if (ret < 0) 4077c272194SSage Weil goto out_pages; 4087c272194SSage Weil ceph_osdc_put_request(req); 4092b1ac852SYan, Zheng 4102b1ac852SYan, Zheng /* After adding locked pages to page cache, the inode holds cache cap. 4112b1ac852SYan, Zheng * So we can drop our cap refs. */ 4122b1ac852SYan, Zheng if (got) 4132b1ac852SYan, Zheng ceph_put_cap_refs(ci, got); 4142b1ac852SYan, Zheng 4157c272194SSage Weil return nr_pages; 4167c272194SSage Weil 4177c272194SSage Weil out_pages: 4181afe4785SYan, Zheng for (i = 0; i < nr_pages; ++i) { 4191afe4785SYan, Zheng ceph_fscache_readpage_cancel(inode, pages[i]); 4201afe4785SYan, Zheng unlock_page(pages[i]); 4211afe4785SYan, Zheng } 4221afe4785SYan, Zheng ceph_put_page_vector(pages, nr_pages, false); 4232b1ac852SYan, Zheng out_put: 4247c272194SSage Weil ceph_osdc_put_request(req); 4252b1ac852SYan, Zheng out: 4262b1ac852SYan, Zheng if (got) 4272b1ac852SYan, Zheng ceph_put_cap_refs(ci, got); 4287c272194SSage Weil return ret; 4291d3576fdSSage Weil } 4301d3576fdSSage Weil 4317c272194SSage Weil 4321d3576fdSSage Weil /* 4331d3576fdSSage Weil * Read multiple pages. Leave pages we don't read + unlock in page_list; 4341d3576fdSSage Weil * the caller (VM) cleans them up. 4351d3576fdSSage Weil */ 4361d3576fdSSage Weil static int ceph_readpages(struct file *file, struct address_space *mapping, 4371d3576fdSSage Weil struct list_head *page_list, unsigned nr_pages) 4381d3576fdSSage Weil { 439496ad9aaSAl Viro struct inode *inode = file_inode(file); 4400d66a487SSage Weil struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 4411d3576fdSSage Weil int rc = 0; 4420d66a487SSage Weil int max = 0; 4431d3576fdSSage Weil 44483701246SYan, Zheng if (ceph_inode(inode)->i_inline_version != CEPH_INLINE_NONE) 44583701246SYan, Zheng return -EINVAL; 44683701246SYan, Zheng 44799ccbd22SMilosz Tanski rc = ceph_readpages_from_fscache(mapping->host, mapping, page_list, 44899ccbd22SMilosz Tanski &nr_pages); 44999ccbd22SMilosz Tanski 45099ccbd22SMilosz Tanski if (rc == 0) 45199ccbd22SMilosz Tanski goto out; 45299ccbd22SMilosz Tanski 45309cbfeafSKirill A. Shutemov if (fsc->mount_options->rsize >= PAGE_SIZE) 45409cbfeafSKirill A. Shutemov max = (fsc->mount_options->rsize + PAGE_SIZE - 1) 4550d66a487SSage Weil >> PAGE_SHIFT; 4560d66a487SSage Weil 4572794a82aSAlex Elder dout("readpages %p file %p nr_pages %d max %d\n", inode, 4582794a82aSAlex Elder file, nr_pages, 4590d66a487SSage Weil max); 4607c272194SSage Weil while (!list_empty(page_list)) { 4610d66a487SSage Weil rc = start_read(inode, page_list, max); 4621d3576fdSSage Weil if (rc < 0) 4631d3576fdSSage Weil goto out; 4641d3576fdSSage Weil } 4651d3576fdSSage Weil out: 46676be778bSMilosz Tanski ceph_fscache_readpages_cancel(inode, page_list); 46776be778bSMilosz Tanski 4687c272194SSage Weil dout("readpages %p file %p ret %d\n", inode, file, rc); 4691d3576fdSSage Weil return rc; 4701d3576fdSSage Weil } 4711d3576fdSSage Weil 4721d3576fdSSage Weil /* 4731d3576fdSSage Weil * Get ref for the oldest snapc for an inode with dirty data... that is, the 4741d3576fdSSage Weil * only snap context we are allowed to write back. 4751d3576fdSSage Weil */ 4766298a337SSage Weil static struct ceph_snap_context *get_oldest_context(struct inode *inode, 4775f743e45SYan, Zheng loff_t *snap_size, 4785f743e45SYan, Zheng u64 *truncate_size, 4795f743e45SYan, Zheng u32 *truncate_seq) 4801d3576fdSSage Weil { 4811d3576fdSSage Weil struct ceph_inode_info *ci = ceph_inode(inode); 4821d3576fdSSage Weil struct ceph_snap_context *snapc = NULL; 4831d3576fdSSage Weil struct ceph_cap_snap *capsnap = NULL; 4841d3576fdSSage Weil 485be655596SSage Weil spin_lock(&ci->i_ceph_lock); 4861d3576fdSSage Weil list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { 4871d3576fdSSage Weil dout(" cap_snap %p snapc %p has %d dirty pages\n", capsnap, 4881d3576fdSSage Weil capsnap->context, capsnap->dirty_pages); 4891d3576fdSSage Weil if (capsnap->dirty_pages) { 4901d3576fdSSage Weil snapc = ceph_get_snap_context(capsnap->context); 4911d3576fdSSage Weil if (snap_size) 4921d3576fdSSage Weil *snap_size = capsnap->size; 4935f743e45SYan, Zheng if (truncate_size) 4945f743e45SYan, Zheng *truncate_size = capsnap->truncate_size; 4955f743e45SYan, Zheng if (truncate_seq) 4965f743e45SYan, Zheng *truncate_seq = capsnap->truncate_seq; 4971d3576fdSSage Weil break; 4981d3576fdSSage Weil } 4991d3576fdSSage Weil } 5007d8cb26dSSage Weil if (!snapc && ci->i_wrbuffer_ref_head) { 50180e755feSSage Weil snapc = ceph_get_snap_context(ci->i_head_snapc); 5021d3576fdSSage Weil dout(" head snapc %p has %d dirty pages\n", 5031d3576fdSSage Weil snapc, ci->i_wrbuffer_ref_head); 5045f743e45SYan, Zheng if (truncate_size) 50584fcc2d2SGeng, Jichao *truncate_size = ci->i_truncate_size; 5065f743e45SYan, Zheng if (truncate_seq) 50784fcc2d2SGeng, Jichao *truncate_seq = ci->i_truncate_seq; 5081d3576fdSSage Weil } 509be655596SSage Weil spin_unlock(&ci->i_ceph_lock); 5101d3576fdSSage Weil return snapc; 5111d3576fdSSage Weil } 5121d3576fdSSage Weil 5131d3576fdSSage Weil /* 5141d3576fdSSage Weil * Write a single page, but leave the page locked. 5151d3576fdSSage Weil * 5161d3576fdSSage Weil * If we get a write error, set the page error bit, but still adjust the 5171d3576fdSSage Weil * dirty page accounting (i.e., page is no longer dirty). 5181d3576fdSSage Weil */ 5191d3576fdSSage Weil static int writepage_nounlock(struct page *page, struct writeback_control *wbc) 5201d3576fdSSage Weil { 5211d3576fdSSage Weil struct inode *inode; 5221d3576fdSSage Weil struct ceph_inode_info *ci; 5233d14c5d2SYehuda Sadeh struct ceph_fs_client *fsc; 5241d3576fdSSage Weil struct ceph_osd_client *osdc; 5256298a337SSage Weil struct ceph_snap_context *snapc, *oldest; 526fc2744aaSYan, Zheng loff_t page_off = page_offset(page); 527e1966b49SYan, Zheng loff_t snap_size = -1; 5282baba250SYehuda Sadeh long writeback_stat; 529e1966b49SYan, Zheng u64 truncate_size; 530fc2744aaSYan, Zheng u32 truncate_seq; 53109cbfeafSKirill A. Shutemov int err = 0, len = PAGE_SIZE; 5321d3576fdSSage Weil 5331d3576fdSSage Weil dout("writepage %p idx %lu\n", page, page->index); 5341d3576fdSSage Weil 5351d3576fdSSage Weil if (!page->mapping || !page->mapping->host) { 5361d3576fdSSage Weil dout("writepage %p - no mapping\n", page); 5371d3576fdSSage Weil return -EFAULT; 5381d3576fdSSage Weil } 5391d3576fdSSage Weil inode = page->mapping->host; 5401d3576fdSSage Weil ci = ceph_inode(inode); 5413d14c5d2SYehuda Sadeh fsc = ceph_inode_to_client(inode); 5423d14c5d2SYehuda Sadeh osdc = &fsc->client->osdc; 5431d3576fdSSage Weil 5441d3576fdSSage Weil /* verify this is a writeable snap context */ 54561600ef8SYan, Zheng snapc = page_snap_context(page); 5461d3576fdSSage Weil if (snapc == NULL) { 5471d3576fdSSage Weil dout("writepage %p page %p not dirty?\n", inode, page); 5481d3576fdSSage Weil goto out; 5491d3576fdSSage Weil } 5505f743e45SYan, Zheng oldest = get_oldest_context(inode, &snap_size, 5515f743e45SYan, Zheng &truncate_size, &truncate_seq); 5526298a337SSage Weil if (snapc->seq > oldest->seq) { 5531d3576fdSSage Weil dout("writepage %p page %p snapc %p not writeable - noop\n", 55461600ef8SYan, Zheng inode, page, snapc); 5551d3576fdSSage Weil /* we should only noop if called by kswapd */ 5561d3576fdSSage Weil WARN_ON((current->flags & PF_MEMALLOC) == 0); 5576298a337SSage Weil ceph_put_snap_context(oldest); 5581d3576fdSSage Weil goto out; 5591d3576fdSSage Weil } 5606298a337SSage Weil ceph_put_snap_context(oldest); 5611d3576fdSSage Weil 562e1966b49SYan, Zheng if (snap_size == -1) 563fc2744aaSYan, Zheng snap_size = i_size_read(inode); 564fc2744aaSYan, Zheng 5651d3576fdSSage Weil /* is this a partial page at end of file? */ 566fc2744aaSYan, Zheng if (page_off >= snap_size) { 567fc2744aaSYan, Zheng dout("%p page eof %llu\n", page, snap_size); 568fc2744aaSYan, Zheng goto out; 569fc2744aaSYan, Zheng } 570fc2744aaSYan, Zheng if (snap_size < page_off + len) 571fc2744aaSYan, Zheng len = snap_size - page_off; 5721d3576fdSSage Weil 573ae00d4f3SSage Weil dout("writepage %p page %p index %lu on %llu~%u snapc %p\n", 574ae00d4f3SSage Weil inode, page, page->index, page_off, len, snapc); 5751d3576fdSSage Weil 5763d14c5d2SYehuda Sadeh writeback_stat = atomic_long_inc_return(&fsc->writeback_count); 5772baba250SYehuda Sadeh if (writeback_stat > 5783d14c5d2SYehuda Sadeh CONGESTION_ON_THRESH(fsc->mount_options->congestion_kb)) 5793d14c5d2SYehuda Sadeh set_bdi_congested(&fsc->backing_dev_info, BLK_RW_ASYNC); 5802baba250SYehuda Sadeh 5811d3576fdSSage Weil set_page_writeback(page); 5821d3576fdSSage Weil err = ceph_osdc_writepages(osdc, ceph_vino(inode), 5831d3576fdSSage Weil &ci->i_layout, snapc, 5841d3576fdSSage Weil page_off, len, 585fc2744aaSYan, Zheng truncate_seq, truncate_size, 58624808826SAlex Elder &inode->i_mtime, &page, 1); 5871d3576fdSSage Weil if (err < 0) { 588ad15ec06SYan, Zheng struct writeback_control tmp_wbc; 589ad15ec06SYan, Zheng if (!wbc) 590ad15ec06SYan, Zheng wbc = &tmp_wbc; 591ad15ec06SYan, Zheng if (err == -ERESTARTSYS) { 592ad15ec06SYan, Zheng /* killed by SIGKILL */ 593ad15ec06SYan, Zheng dout("writepage interrupted page %p\n", page); 594ad15ec06SYan, Zheng redirty_page_for_writepage(wbc, page); 595ad15ec06SYan, Zheng end_page_writeback(page); 596ad15ec06SYan, Zheng goto out; 597ad15ec06SYan, Zheng } 598ad15ec06SYan, Zheng dout("writepage setting page/mapping error %d %p\n", 599ad15ec06SYan, Zheng err, page); 6001d3576fdSSage Weil SetPageError(page); 6011d3576fdSSage Weil mapping_set_error(&inode->i_data, err); 6021d3576fdSSage Weil wbc->pages_skipped++; 6031d3576fdSSage Weil } else { 6041d3576fdSSage Weil dout("writepage cleaned page %p\n", page); 6051d3576fdSSage Weil err = 0; /* vfs expects us to return 0 */ 6061d3576fdSSage Weil } 6071d3576fdSSage Weil page->private = 0; 6081d3576fdSSage Weil ClearPagePrivate(page); 6091d3576fdSSage Weil end_page_writeback(page); 6101d3576fdSSage Weil ceph_put_wrbuffer_cap_refs(ci, 1, snapc); 6116298a337SSage Weil ceph_put_snap_context(snapc); /* page's reference */ 6121d3576fdSSage Weil out: 6131d3576fdSSage Weil return err; 6141d3576fdSSage Weil } 6151d3576fdSSage Weil 6161d3576fdSSage Weil static int ceph_writepage(struct page *page, struct writeback_control *wbc) 6171d3576fdSSage Weil { 618dbd646a8SYehuda Sadeh int err; 619dbd646a8SYehuda Sadeh struct inode *inode = page->mapping->host; 620dbd646a8SYehuda Sadeh BUG_ON(!inode); 62170b666c3SSage Weil ihold(inode); 622dbd646a8SYehuda Sadeh err = writepage_nounlock(page, wbc); 623ad15ec06SYan, Zheng if (err == -ERESTARTSYS) { 624ad15ec06SYan, Zheng /* direct memory reclaimer was killed by SIGKILL. return 0 625ad15ec06SYan, Zheng * to prevent caller from setting mapping/page error */ 626ad15ec06SYan, Zheng err = 0; 627ad15ec06SYan, Zheng } 6281d3576fdSSage Weil unlock_page(page); 629dbd646a8SYehuda Sadeh iput(inode); 6301d3576fdSSage Weil return err; 6311d3576fdSSage Weil } 6321d3576fdSSage Weil 6331d3576fdSSage Weil /* 6341d3576fdSSage Weil * lame release_pages helper. release_pages() isn't exported to 6351d3576fdSSage Weil * modules. 6361d3576fdSSage Weil */ 6371d3576fdSSage Weil static void ceph_release_pages(struct page **pages, int num) 6381d3576fdSSage Weil { 6391d3576fdSSage Weil struct pagevec pvec; 6401d3576fdSSage Weil int i; 6411d3576fdSSage Weil 6421d3576fdSSage Weil pagevec_init(&pvec, 0); 6431d3576fdSSage Weil for (i = 0; i < num; i++) { 6441d3576fdSSage Weil if (pagevec_add(&pvec, pages[i]) == 0) 6451d3576fdSSage Weil pagevec_release(&pvec); 6461d3576fdSSage Weil } 6471d3576fdSSage Weil pagevec_release(&pvec); 6481d3576fdSSage Weil } 6491d3576fdSSage Weil 6501d3576fdSSage Weil /* 6511d3576fdSSage Weil * async writeback completion handler. 6521d3576fdSSage Weil * 6531d3576fdSSage Weil * If we get an error, set the mapping error bit, but not the individual 6541d3576fdSSage Weil * page error bits. 6551d3576fdSSage Weil */ 65685e084feSIlya Dryomov static void writepages_finish(struct ceph_osd_request *req) 6571d3576fdSSage Weil { 6581d3576fdSSage Weil struct inode *inode = req->r_inode; 6591d3576fdSSage Weil struct ceph_inode_info *ci = ceph_inode(inode); 66087060c10SAlex Elder struct ceph_osd_data *osd_data; 6611d3576fdSSage Weil struct page *page; 6625b64640cSYan, Zheng int num_pages, total_pages = 0; 6635b64640cSYan, Zheng int i, j; 6645b64640cSYan, Zheng int rc = req->r_result; 6651d3576fdSSage Weil struct ceph_snap_context *snapc = req->r_snapc; 6661d3576fdSSage Weil struct address_space *mapping = inode->i_mapping; 6673d14c5d2SYehuda Sadeh struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 6685b64640cSYan, Zheng bool remove_page; 6691d3576fdSSage Weil 6705b64640cSYan, Zheng dout("writepages_finish %p rc %d\n", inode, rc); 6715b64640cSYan, Zheng if (rc < 0) 6721d3576fdSSage Weil mapping_set_error(mapping, rc); 673e63dc5c7SYehuda Sadeh 674e63dc5c7SYehuda Sadeh /* 675e63dc5c7SYehuda Sadeh * We lost the cache cap, need to truncate the page before 676e63dc5c7SYehuda Sadeh * it is unlocked, otherwise we'd truncate it later in the 677e63dc5c7SYehuda Sadeh * page truncation thread, possibly losing some data that 678e63dc5c7SYehuda Sadeh * raced its way in 679e63dc5c7SYehuda Sadeh */ 6805b64640cSYan, Zheng remove_page = !(ceph_caps_issued(ci) & 6815b64640cSYan, Zheng (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)); 6825b64640cSYan, Zheng 6835b64640cSYan, Zheng /* clean all pages */ 6845b64640cSYan, Zheng for (i = 0; i < req->r_num_ops; i++) { 6855b64640cSYan, Zheng if (req->r_ops[i].op != CEPH_OSD_OP_WRITE) 6865b64640cSYan, Zheng break; 6875b64640cSYan, Zheng 6885b64640cSYan, Zheng osd_data = osd_req_op_extent_osd_data(req, i); 6895b64640cSYan, Zheng BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES); 6905b64640cSYan, Zheng num_pages = calc_pages_for((u64)osd_data->alignment, 6915b64640cSYan, Zheng (u64)osd_data->length); 6925b64640cSYan, Zheng total_pages += num_pages; 6935b64640cSYan, Zheng for (j = 0; j < num_pages; j++) { 6945b64640cSYan, Zheng page = osd_data->pages[j]; 6955b64640cSYan, Zheng BUG_ON(!page); 6965b64640cSYan, Zheng WARN_ON(!PageUptodate(page)); 6975b64640cSYan, Zheng 6985b64640cSYan, Zheng if (atomic_long_dec_return(&fsc->writeback_count) < 6995b64640cSYan, Zheng CONGESTION_OFF_THRESH( 7005b64640cSYan, Zheng fsc->mount_options->congestion_kb)) 7015b64640cSYan, Zheng clear_bdi_congested(&fsc->backing_dev_info, 7025b64640cSYan, Zheng BLK_RW_ASYNC); 7035b64640cSYan, Zheng 704b109eec6SYan, Zheng if (rc < 0) 705b109eec6SYan, Zheng SetPageError(page); 706b109eec6SYan, Zheng 7075b64640cSYan, Zheng ceph_put_snap_context(page_snap_context(page)); 7085b64640cSYan, Zheng page->private = 0; 7095b64640cSYan, Zheng ClearPagePrivate(page); 7105b64640cSYan, Zheng dout("unlocking %p\n", page); 7115b64640cSYan, Zheng end_page_writeback(page); 7125b64640cSYan, Zheng 7135b64640cSYan, Zheng if (remove_page) 7145b64640cSYan, Zheng generic_error_remove_page(inode->i_mapping, 7155b64640cSYan, Zheng page); 716e63dc5c7SYehuda Sadeh 7171d3576fdSSage Weil unlock_page(page); 7181d3576fdSSage Weil } 7195b64640cSYan, Zheng dout("writepages_finish %p wrote %llu bytes cleaned %d pages\n", 7205b64640cSYan, Zheng inode, osd_data->length, rc >= 0 ? num_pages : 0); 7211d3576fdSSage Weil 72287060c10SAlex Elder ceph_release_pages(osd_data->pages, num_pages); 7235b64640cSYan, Zheng } 7245b64640cSYan, Zheng 7255b64640cSYan, Zheng ceph_put_wrbuffer_cap_refs(ci, total_pages, snapc); 7265b64640cSYan, Zheng 7275b64640cSYan, Zheng osd_data = osd_req_op_extent_osd_data(req, 0); 72887060c10SAlex Elder if (osd_data->pages_from_pool) 72987060c10SAlex Elder mempool_free(osd_data->pages, 730640ef79dSCheng Renquan ceph_sb_to_client(inode->i_sb)->wb_pagevec_pool); 7311d3576fdSSage Weil else 73287060c10SAlex Elder kfree(osd_data->pages); 7331d3576fdSSage Weil ceph_osdc_put_request(req); 7341d3576fdSSage Weil } 7351d3576fdSSage Weil 7361d3576fdSSage Weil /* 7371d3576fdSSage Weil * initiate async writeback 7381d3576fdSSage Weil */ 7391d3576fdSSage Weil static int ceph_writepages_start(struct address_space *mapping, 7401d3576fdSSage Weil struct writeback_control *wbc) 7411d3576fdSSage Weil { 7421d3576fdSSage Weil struct inode *inode = mapping->host; 7431d3576fdSSage Weil struct ceph_inode_info *ci = ceph_inode(inode); 744fc2744aaSYan, Zheng struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 745fc2744aaSYan, Zheng struct ceph_vino vino = ceph_vino(inode); 7461d3576fdSSage Weil pgoff_t index, start, end; 7471d3576fdSSage Weil int range_whole = 0; 7481d3576fdSSage Weil int should_loop = 1; 7491d3576fdSSage Weil pgoff_t max_pages = 0, max_pages_ever = 0; 75080e755feSSage Weil struct ceph_snap_context *snapc = NULL, *last_snapc = NULL, *pgsnapc; 7511d3576fdSSage Weil struct pagevec pvec; 7521d3576fdSSage Weil int done = 0; 7531d3576fdSSage Weil int rc = 0; 75493407472SFabian Frederick unsigned int wsize = i_blocksize(inode); 7551d3576fdSSage Weil struct ceph_osd_request *req = NULL; 756021b77beSDan Carpenter int do_sync = 0; 757e1966b49SYan, Zheng loff_t snap_size, i_size; 758e1966b49SYan, Zheng u64 truncate_size; 759fc2744aaSYan, Zheng u32 truncate_seq; 7601d3576fdSSage Weil 7611d3576fdSSage Weil /* 7621d3576fdSSage Weil * Include a 'sync' in the OSD request if this is a data 7631d3576fdSSage Weil * integrity write (e.g., O_SYNC write or fsync()), or if our 7641d3576fdSSage Weil * cap is being revoked. 7651d3576fdSSage Weil */ 766c62988ecSmajianpeng if ((wbc->sync_mode == WB_SYNC_ALL) || 767c62988ecSmajianpeng ceph_caps_revoking(ci, CEPH_CAP_FILE_BUFFER)) 7681d3576fdSSage Weil do_sync = 1; 7691d3576fdSSage Weil dout("writepages_start %p dosync=%d (mode=%s)\n", 7701d3576fdSSage Weil inode, do_sync, 7711d3576fdSSage Weil wbc->sync_mode == WB_SYNC_NONE ? "NONE" : 7721d3576fdSSage Weil (wbc->sync_mode == WB_SYNC_ALL ? "ALL" : "HOLD")); 7731d3576fdSSage Weil 77448fec5d0SYan, Zheng if (ACCESS_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) { 7756c93df5dSYan, Zheng if (ci->i_wrbuffer_ref > 0) { 7766c93df5dSYan, Zheng pr_warn_ratelimited( 7776c93df5dSYan, Zheng "writepage_start %p %lld forced umount\n", 7786c93df5dSYan, Zheng inode, ceph_ino(inode)); 7796c93df5dSYan, Zheng } 780a341d4dfSYan, Zheng mapping_set_error(mapping, -EIO); 7811d3576fdSSage Weil return -EIO; /* we're in a forced umount, don't write! */ 7821d3576fdSSage Weil } 7833d14c5d2SYehuda Sadeh if (fsc->mount_options->wsize && fsc->mount_options->wsize < wsize) 7843d14c5d2SYehuda Sadeh wsize = fsc->mount_options->wsize; 78509cbfeafSKirill A. Shutemov if (wsize < PAGE_SIZE) 78609cbfeafSKirill A. Shutemov wsize = PAGE_SIZE; 78709cbfeafSKirill A. Shutemov max_pages_ever = wsize >> PAGE_SHIFT; 7881d3576fdSSage Weil 7891d3576fdSSage Weil pagevec_init(&pvec, 0); 7901d3576fdSSage Weil 7911d3576fdSSage Weil /* where to start/end? */ 7921d3576fdSSage Weil if (wbc->range_cyclic) { 7931d3576fdSSage Weil start = mapping->writeback_index; /* Start from prev offset */ 7941d3576fdSSage Weil end = -1; 7951d3576fdSSage Weil dout(" cyclic, start at %lu\n", start); 7961d3576fdSSage Weil } else { 79709cbfeafSKirill A. Shutemov start = wbc->range_start >> PAGE_SHIFT; 79809cbfeafSKirill A. Shutemov end = wbc->range_end >> PAGE_SHIFT; 7991d3576fdSSage Weil if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) 8001d3576fdSSage Weil range_whole = 1; 8011d3576fdSSage Weil should_loop = 0; 8021d3576fdSSage Weil dout(" not cyclic, %lu to %lu\n", start, end); 8031d3576fdSSage Weil } 8041d3576fdSSage Weil index = start; 8051d3576fdSSage Weil 8061d3576fdSSage Weil retry: 8071d3576fdSSage Weil /* find oldest snap context with dirty data */ 8081d3576fdSSage Weil ceph_put_snap_context(snapc); 809e1966b49SYan, Zheng snap_size = -1; 8105f743e45SYan, Zheng snapc = get_oldest_context(inode, &snap_size, 8115f743e45SYan, Zheng &truncate_size, &truncate_seq); 8121d3576fdSSage Weil if (!snapc) { 8131d3576fdSSage Weil /* hmm, why does writepages get called when there 8141d3576fdSSage Weil is no dirty data? */ 8151d3576fdSSage Weil dout(" no snap context with dirty data?\n"); 8161d3576fdSSage Weil goto out; 8171d3576fdSSage Weil } 8181d3576fdSSage Weil dout(" oldest snapc is %p seq %lld (%d snaps)\n", 8191d3576fdSSage Weil snapc, snapc->seq, snapc->num_snaps); 820fc2744aaSYan, Zheng 821e1966b49SYan, Zheng i_size = i_size_read(inode); 822fc2744aaSYan, Zheng 8231d3576fdSSage Weil if (last_snapc && snapc != last_snapc) { 8241d3576fdSSage Weil /* if we switched to a newer snapc, restart our scan at the 8251d3576fdSSage Weil * start of the original file range. */ 8261d3576fdSSage Weil dout(" snapc differs from last pass, restarting at %lu\n", 8271d3576fdSSage Weil index); 8281d3576fdSSage Weil index = start; 8291d3576fdSSage Weil } 8301d3576fdSSage Weil last_snapc = snapc; 8311d3576fdSSage Weil 8321d3576fdSSage Weil while (!done && index <= end) { 8331d3576fdSSage Weil unsigned i; 8341d3576fdSSage Weil int first; 8355b64640cSYan, Zheng pgoff_t strip_unit_end = 0; 8365b64640cSYan, Zheng int num_ops = 0, op_idx; 8375b64640cSYan, Zheng int pvec_pages, locked_pages = 0; 8385b64640cSYan, Zheng struct page **pages = NULL, **data_pages; 839e5975c7cSAlex Elder mempool_t *pool = NULL; /* Becomes non-null if mempool used */ 8401d3576fdSSage Weil struct page *page; 8411d3576fdSSage Weil int want; 8425b64640cSYan, Zheng u64 offset = 0, len = 0; 8431d3576fdSSage Weil 8441d3576fdSSage Weil max_pages = max_pages_ever; 8451d3576fdSSage Weil 8461d3576fdSSage Weil get_more_pages: 8471d3576fdSSage Weil first = -1; 8481d3576fdSSage Weil want = min(end - index, 8491d3576fdSSage Weil min((pgoff_t)PAGEVEC_SIZE, 8501d3576fdSSage Weil max_pages - (pgoff_t)locked_pages) - 1) 8511d3576fdSSage Weil + 1; 8521d3576fdSSage Weil pvec_pages = pagevec_lookup_tag(&pvec, mapping, &index, 8531d3576fdSSage Weil PAGECACHE_TAG_DIRTY, 8541d3576fdSSage Weil want); 8551d3576fdSSage Weil dout("pagevec_lookup_tag got %d\n", pvec_pages); 8561d3576fdSSage Weil if (!pvec_pages && !locked_pages) 8571d3576fdSSage Weil break; 8581d3576fdSSage Weil for (i = 0; i < pvec_pages && locked_pages < max_pages; i++) { 8591d3576fdSSage Weil page = pvec.pages[i]; 8601d3576fdSSage Weil dout("? %p idx %lu\n", page, page->index); 8611d3576fdSSage Weil if (locked_pages == 0) 8621d3576fdSSage Weil lock_page(page); /* first page */ 8631d3576fdSSage Weil else if (!trylock_page(page)) 8641d3576fdSSage Weil break; 8651d3576fdSSage Weil 8661d3576fdSSage Weil /* only dirty pages, or our accounting breaks */ 8671d3576fdSSage Weil if (unlikely(!PageDirty(page)) || 8681d3576fdSSage Weil unlikely(page->mapping != mapping)) { 8691d3576fdSSage Weil dout("!dirty or !mapping %p\n", page); 8701d3576fdSSage Weil unlock_page(page); 8711d3576fdSSage Weil break; 8721d3576fdSSage Weil } 8731d3576fdSSage Weil if (!wbc->range_cyclic && page->index > end) { 8741d3576fdSSage Weil dout("end of range %p\n", page); 8751d3576fdSSage Weil done = 1; 8761d3576fdSSage Weil unlock_page(page); 8771d3576fdSSage Weil break; 8781d3576fdSSage Weil } 8795b64640cSYan, Zheng if (strip_unit_end && (page->index > strip_unit_end)) { 8805b64640cSYan, Zheng dout("end of strip unit %p\n", page); 8811d3576fdSSage Weil unlock_page(page); 8821d3576fdSSage Weil break; 8831d3576fdSSage Weil } 8841d3576fdSSage Weil if (wbc->sync_mode != WB_SYNC_NONE) { 8851d3576fdSSage Weil dout("waiting on writeback %p\n", page); 8861d3576fdSSage Weil wait_on_page_writeback(page); 8871d3576fdSSage Weil } 888e1966b49SYan, Zheng if (page_offset(page) >= 889e1966b49SYan, Zheng (snap_size == -1 ? i_size : snap_size)) { 890e1966b49SYan, Zheng dout("%p page eof %llu\n", page, 891e1966b49SYan, Zheng (snap_size == -1 ? i_size : snap_size)); 8921d3576fdSSage Weil done = 1; 8931d3576fdSSage Weil unlock_page(page); 8941d3576fdSSage Weil break; 8951d3576fdSSage Weil } 8961d3576fdSSage Weil if (PageWriteback(page)) { 8971d3576fdSSage Weil dout("%p under writeback\n", page); 8981d3576fdSSage Weil unlock_page(page); 8991d3576fdSSage Weil break; 9001d3576fdSSage Weil } 9011d3576fdSSage Weil 9021d3576fdSSage Weil /* only if matching snap context */ 90361600ef8SYan, Zheng pgsnapc = page_snap_context(page); 90480e755feSSage Weil if (pgsnapc->seq > snapc->seq) { 90580e755feSSage Weil dout("page snapc %p %lld > oldest %p %lld\n", 90680e755feSSage Weil pgsnapc, pgsnapc->seq, snapc, snapc->seq); 9071d3576fdSSage Weil unlock_page(page); 9081d3576fdSSage Weil if (!locked_pages) 9091d3576fdSSage Weil continue; /* keep looking for snap */ 9101d3576fdSSage Weil break; 9111d3576fdSSage Weil } 9121d3576fdSSage Weil 9131d3576fdSSage Weil if (!clear_page_dirty_for_io(page)) { 9141d3576fdSSage Weil dout("%p !clear_page_dirty_for_io\n", page); 9151d3576fdSSage Weil unlock_page(page); 9161d3576fdSSage Weil break; 9171d3576fdSSage Weil } 9181d3576fdSSage Weil 919e5975c7cSAlex Elder /* 920e5975c7cSAlex Elder * We have something to write. If this is 921e5975c7cSAlex Elder * the first locked page this time through, 9225b64640cSYan, Zheng * calculate max possinle write size and 9235b64640cSYan, Zheng * allocate a page array 924e5975c7cSAlex Elder */ 9251d3576fdSSage Weil if (locked_pages == 0) { 9265b64640cSYan, Zheng u64 objnum; 9275b64640cSYan, Zheng u64 objoff; 9285b64640cSYan, Zheng 9291d3576fdSSage Weil /* prepare async write request */ 9306285bc23SAlex Elder offset = (u64)page_offset(page); 9311d3576fdSSage Weil len = wsize; 9325b64640cSYan, Zheng 9335b64640cSYan, Zheng rc = ceph_calc_file_object_mapping(&ci->i_layout, 9345b64640cSYan, Zheng offset, len, 9355b64640cSYan, Zheng &objnum, &objoff, 9365b64640cSYan, Zheng &len); 9375b64640cSYan, Zheng if (rc < 0) { 9388c71897bSHenry C Chang unlock_page(page); 9398c71897bSHenry C Chang break; 9408c71897bSHenry C Chang } 9418c71897bSHenry C Chang 9425b64640cSYan, Zheng num_ops = 1 + do_sync; 9435b64640cSYan, Zheng strip_unit_end = page->index + 94409cbfeafSKirill A. Shutemov ((len - 1) >> PAGE_SHIFT); 945715e4cd4SYan, Zheng 9465b64640cSYan, Zheng BUG_ON(pages); 94788486957SAlex Elder max_pages = calc_pages_for(0, (u64)len); 948fc2744aaSYan, Zheng pages = kmalloc(max_pages * sizeof (*pages), 949fc2744aaSYan, Zheng GFP_NOFS); 95088486957SAlex Elder if (!pages) { 95188486957SAlex Elder pool = fsc->wb_pagevec_pool; 95288486957SAlex Elder pages = mempool_alloc(pool, GFP_NOFS); 953e5975c7cSAlex Elder BUG_ON(!pages); 95488486957SAlex Elder } 9555b64640cSYan, Zheng 9565b64640cSYan, Zheng len = 0; 9575b64640cSYan, Zheng } else if (page->index != 95809cbfeafSKirill A. Shutemov (offset + len) >> PAGE_SHIFT) { 9595b64640cSYan, Zheng if (num_ops >= (pool ? CEPH_OSD_SLAB_OPS : 9605b64640cSYan, Zheng CEPH_OSD_MAX_OPS)) { 9615b64640cSYan, Zheng redirty_page_for_writepage(wbc, page); 9625b64640cSYan, Zheng unlock_page(page); 9635b64640cSYan, Zheng break; 9645b64640cSYan, Zheng } 9655b64640cSYan, Zheng 9665b64640cSYan, Zheng num_ops++; 9675b64640cSYan, Zheng offset = (u64)page_offset(page); 9685b64640cSYan, Zheng len = 0; 9691d3576fdSSage Weil } 9701d3576fdSSage Weil 9711d3576fdSSage Weil /* note position of first page in pvec */ 9721d3576fdSSage Weil if (first < 0) 9731d3576fdSSage Weil first = i; 9741d3576fdSSage Weil dout("%p will write page %p idx %lu\n", 9751d3576fdSSage Weil inode, page, page->index); 9762baba250SYehuda Sadeh 9775b64640cSYan, Zheng if (atomic_long_inc_return(&fsc->writeback_count) > 9785b64640cSYan, Zheng CONGESTION_ON_THRESH( 9793d14c5d2SYehuda Sadeh fsc->mount_options->congestion_kb)) { 9803d14c5d2SYehuda Sadeh set_bdi_congested(&fsc->backing_dev_info, 981213c99eeSSage Weil BLK_RW_ASYNC); 9822baba250SYehuda Sadeh } 9832baba250SYehuda Sadeh 984e5975c7cSAlex Elder pages[locked_pages] = page; 9851d3576fdSSage Weil locked_pages++; 98609cbfeafSKirill A. Shutemov len += PAGE_SIZE; 9871d3576fdSSage Weil } 9881d3576fdSSage Weil 9891d3576fdSSage Weil /* did we get anything? */ 9901d3576fdSSage Weil if (!locked_pages) 9911d3576fdSSage Weil goto release_pvec_pages; 9921d3576fdSSage Weil if (i) { 9931d3576fdSSage Weil int j; 9941d3576fdSSage Weil BUG_ON(!locked_pages || first < 0); 9951d3576fdSSage Weil 9961d3576fdSSage Weil if (pvec_pages && i == pvec_pages && 9971d3576fdSSage Weil locked_pages < max_pages) { 9981d3576fdSSage Weil dout("reached end pvec, trying for more\n"); 9991d3576fdSSage Weil pagevec_reinit(&pvec); 10001d3576fdSSage Weil goto get_more_pages; 10011d3576fdSSage Weil } 10021d3576fdSSage Weil 10031d3576fdSSage Weil /* shift unused pages over in the pvec... we 10041d3576fdSSage Weil * will need to release them below. */ 10051d3576fdSSage Weil for (j = i; j < pvec_pages; j++) { 10065b64640cSYan, Zheng dout(" pvec leftover page %p\n", pvec.pages[j]); 10071d3576fdSSage Weil pvec.pages[j-i+first] = pvec.pages[j]; 10081d3576fdSSage Weil } 10091d3576fdSSage Weil pvec.nr -= i-first; 10101d3576fdSSage Weil } 10111d3576fdSSage Weil 10125b64640cSYan, Zheng new_request: 1013e5975c7cSAlex Elder offset = page_offset(pages[0]); 10145b64640cSYan, Zheng len = wsize; 10155b64640cSYan, Zheng 10165b64640cSYan, Zheng req = ceph_osdc_new_request(&fsc->client->osdc, 10175b64640cSYan, Zheng &ci->i_layout, vino, 10185b64640cSYan, Zheng offset, &len, 0, num_ops, 10195b64640cSYan, Zheng CEPH_OSD_OP_WRITE, 10205b64640cSYan, Zheng CEPH_OSD_FLAG_WRITE | 10215b64640cSYan, Zheng CEPH_OSD_FLAG_ONDISK, 10225b64640cSYan, Zheng snapc, truncate_seq, 10235b64640cSYan, Zheng truncate_size, false); 10245b64640cSYan, Zheng if (IS_ERR(req)) { 10255b64640cSYan, Zheng req = ceph_osdc_new_request(&fsc->client->osdc, 10265b64640cSYan, Zheng &ci->i_layout, vino, 10275b64640cSYan, Zheng offset, &len, 0, 10285b64640cSYan, Zheng min(num_ops, 10295b64640cSYan, Zheng CEPH_OSD_SLAB_OPS), 10305b64640cSYan, Zheng CEPH_OSD_OP_WRITE, 10315b64640cSYan, Zheng CEPH_OSD_FLAG_WRITE | 10325b64640cSYan, Zheng CEPH_OSD_FLAG_ONDISK, 10335b64640cSYan, Zheng snapc, truncate_seq, 10345b64640cSYan, Zheng truncate_size, true); 10355b64640cSYan, Zheng BUG_ON(IS_ERR(req)); 10365b64640cSYan, Zheng } 10375b64640cSYan, Zheng BUG_ON(len < page_offset(pages[locked_pages - 1]) + 103809cbfeafSKirill A. Shutemov PAGE_SIZE - offset); 10395b64640cSYan, Zheng 10405b64640cSYan, Zheng req->r_callback = writepages_finish; 10415b64640cSYan, Zheng req->r_inode = inode; 10425b64640cSYan, Zheng 10435b64640cSYan, Zheng /* Format the osd request message and submit the write */ 10445b64640cSYan, Zheng len = 0; 10455b64640cSYan, Zheng data_pages = pages; 10465b64640cSYan, Zheng op_idx = 0; 10475b64640cSYan, Zheng for (i = 0; i < locked_pages; i++) { 10485b64640cSYan, Zheng u64 cur_offset = page_offset(pages[i]); 10495b64640cSYan, Zheng if (offset + len != cur_offset) { 10505b64640cSYan, Zheng if (op_idx + do_sync + 1 == req->r_num_ops) 10515b64640cSYan, Zheng break; 10525b64640cSYan, Zheng osd_req_op_extent_dup_last(req, op_idx, 10535b64640cSYan, Zheng cur_offset - offset); 10545b64640cSYan, Zheng dout("writepages got pages at %llu~%llu\n", 10555b64640cSYan, Zheng offset, len); 10565b64640cSYan, Zheng osd_req_op_extent_osd_data_pages(req, op_idx, 10575b64640cSYan, Zheng data_pages, len, 0, 10585b64640cSYan, Zheng !!pool, false); 10595b64640cSYan, Zheng osd_req_op_extent_update(req, op_idx, len); 10605b64640cSYan, Zheng 10615b64640cSYan, Zheng len = 0; 10625b64640cSYan, Zheng offset = cur_offset; 10635b64640cSYan, Zheng data_pages = pages + i; 10645b64640cSYan, Zheng op_idx++; 10655b64640cSYan, Zheng } 10665b64640cSYan, Zheng 10675b64640cSYan, Zheng set_page_writeback(pages[i]); 106809cbfeafSKirill A. Shutemov len += PAGE_SIZE; 10695b64640cSYan, Zheng } 10705b64640cSYan, Zheng 10715b64640cSYan, Zheng if (snap_size != -1) { 10725b64640cSYan, Zheng len = min(len, snap_size - offset); 10735b64640cSYan, Zheng } else if (i == locked_pages) { 1074e1966b49SYan, Zheng /* writepages_finish() clears writeback pages 1075e1966b49SYan, Zheng * according to the data length, so make sure 1076e1966b49SYan, Zheng * data length covers all locked pages */ 107709cbfeafSKirill A. Shutemov u64 min_len = len + 1 - PAGE_SIZE; 10785b64640cSYan, Zheng len = min(len, (u64)i_size_read(inode) - offset); 10795b64640cSYan, Zheng len = max(len, min_len); 1080e1966b49SYan, Zheng } 10815b64640cSYan, Zheng dout("writepages got pages at %llu~%llu\n", offset, len); 10821d3576fdSSage Weil 10835b64640cSYan, Zheng osd_req_op_extent_osd_data_pages(req, op_idx, data_pages, len, 10845b64640cSYan, Zheng 0, !!pool, false); 10855b64640cSYan, Zheng osd_req_op_extent_update(req, op_idx, len); 1086e5975c7cSAlex Elder 10875b64640cSYan, Zheng if (do_sync) { 10885b64640cSYan, Zheng op_idx++; 10895b64640cSYan, Zheng osd_req_op_init(req, op_idx, CEPH_OSD_OP_STARTSYNC, 0); 10905b64640cSYan, Zheng } 10915b64640cSYan, Zheng BUG_ON(op_idx + 1 != req->r_num_ops); 10925b64640cSYan, Zheng 1093e5975c7cSAlex Elder pool = NULL; 10945b64640cSYan, Zheng if (i < locked_pages) { 10955b64640cSYan, Zheng BUG_ON(num_ops <= req->r_num_ops); 10965b64640cSYan, Zheng num_ops -= req->r_num_ops; 10975b64640cSYan, Zheng num_ops += do_sync; 10985b64640cSYan, Zheng locked_pages -= i; 1099e5975c7cSAlex Elder 11005b64640cSYan, Zheng /* allocate new pages array for next request */ 11015b64640cSYan, Zheng data_pages = pages; 11025b64640cSYan, Zheng pages = kmalloc(locked_pages * sizeof (*pages), 11035b64640cSYan, Zheng GFP_NOFS); 11045b64640cSYan, Zheng if (!pages) { 11055b64640cSYan, Zheng pool = fsc->wb_pagevec_pool; 11065b64640cSYan, Zheng pages = mempool_alloc(pool, GFP_NOFS); 11075b64640cSYan, Zheng BUG_ON(!pages); 11085b64640cSYan, Zheng } 11095b64640cSYan, Zheng memcpy(pages, data_pages + i, 11105b64640cSYan, Zheng locked_pages * sizeof(*pages)); 11115b64640cSYan, Zheng memset(data_pages + i, 0, 11125b64640cSYan, Zheng locked_pages * sizeof(*pages)); 11135b64640cSYan, Zheng } else { 11145b64640cSYan, Zheng BUG_ON(num_ops != req->r_num_ops); 11155b64640cSYan, Zheng index = pages[i - 1]->index + 1; 11165b64640cSYan, Zheng /* request message now owns the pages array */ 11175b64640cSYan, Zheng pages = NULL; 11185b64640cSYan, Zheng } 1119e5975c7cSAlex Elder 1120bb873b53SIlya Dryomov req->r_mtime = inode->i_mtime; 11219d6fcb08SSage Weil rc = ceph_osdc_start_request(&fsc->client->osdc, req, true); 11229d6fcb08SSage Weil BUG_ON(rc); 11231d3576fdSSage Weil req = NULL; 11241d3576fdSSage Weil 11255b64640cSYan, Zheng wbc->nr_to_write -= i; 11265b64640cSYan, Zheng if (pages) 11275b64640cSYan, Zheng goto new_request; 11285b64640cSYan, Zheng 11291d3576fdSSage Weil if (wbc->nr_to_write <= 0) 11301d3576fdSSage Weil done = 1; 11311d3576fdSSage Weil 11321d3576fdSSage Weil release_pvec_pages: 11331d3576fdSSage Weil dout("pagevec_release on %d pages (%p)\n", (int)pvec.nr, 11341d3576fdSSage Weil pvec.nr ? pvec.pages[0] : NULL); 11351d3576fdSSage Weil pagevec_release(&pvec); 11361d3576fdSSage Weil 11371d3576fdSSage Weil if (locked_pages && !done) 11381d3576fdSSage Weil goto retry; 11391d3576fdSSage Weil } 11401d3576fdSSage Weil 11411d3576fdSSage Weil if (should_loop && !done) { 11421d3576fdSSage Weil /* more to do; loop back to beginning of file */ 11431d3576fdSSage Weil dout("writepages looping back to beginning of file\n"); 11441d3576fdSSage Weil should_loop = 0; 11451d3576fdSSage Weil index = 0; 11461d3576fdSSage Weil goto retry; 11471d3576fdSSage Weil } 11481d3576fdSSage Weil 11491d3576fdSSage Weil if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) 11501d3576fdSSage Weil mapping->writeback_index = index; 11511d3576fdSSage Weil 11521d3576fdSSage Weil out: 11531d3576fdSSage Weil ceph_osdc_put_request(req); 11541d3576fdSSage Weil ceph_put_snap_context(snapc); 11551d3576fdSSage Weil dout("writepages done, rc = %d\n", rc); 11561d3576fdSSage Weil return rc; 11571d3576fdSSage Weil } 11581d3576fdSSage Weil 11591d3576fdSSage Weil 11601d3576fdSSage Weil 11611d3576fdSSage Weil /* 11621d3576fdSSage Weil * See if a given @snapc is either writeable, or already written. 11631d3576fdSSage Weil */ 11641d3576fdSSage Weil static int context_is_writeable_or_written(struct inode *inode, 11651d3576fdSSage Weil struct ceph_snap_context *snapc) 11661d3576fdSSage Weil { 11675f743e45SYan, Zheng struct ceph_snap_context *oldest = get_oldest_context(inode, NULL, 11685f743e45SYan, Zheng NULL, NULL); 11696298a337SSage Weil int ret = !oldest || snapc->seq <= oldest->seq; 11706298a337SSage Weil 11716298a337SSage Weil ceph_put_snap_context(oldest); 11726298a337SSage Weil return ret; 11731d3576fdSSage Weil } 11741d3576fdSSage Weil 11751d3576fdSSage Weil /* 11761d3576fdSSage Weil * We are only allowed to write into/dirty the page if the page is 11771d3576fdSSage Weil * clean, or already dirty within the same snap context. 11788f883c24SSage Weil * 11798f883c24SSage Weil * called with page locked. 11808f883c24SSage Weil * return success with page locked, 11818f883c24SSage Weil * or any failure (incl -EAGAIN) with page unlocked. 11821d3576fdSSage Weil */ 11834af6b225SYehuda Sadeh static int ceph_update_writeable_page(struct file *file, 11844af6b225SYehuda Sadeh loff_t pos, unsigned len, 11854af6b225SYehuda Sadeh struct page *page) 11861d3576fdSSage Weil { 1187496ad9aaSAl Viro struct inode *inode = file_inode(file); 11886c93df5dSYan, Zheng struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 11891d3576fdSSage Weil struct ceph_inode_info *ci = ceph_inode(inode); 119009cbfeafSKirill A. Shutemov loff_t page_off = pos & PAGE_MASK; 119109cbfeafSKirill A. Shutemov int pos_in_page = pos & ~PAGE_MASK; 11921d3576fdSSage Weil int end_in_page = pos_in_page + len; 11931d3576fdSSage Weil loff_t i_size; 11941d3576fdSSage Weil int r; 119580e755feSSage Weil struct ceph_snap_context *snapc, *oldest; 11961d3576fdSSage Weil 11976c93df5dSYan, Zheng if (ACCESS_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) { 11986c93df5dSYan, Zheng dout(" page %p forced umount\n", page); 11996c93df5dSYan, Zheng unlock_page(page); 12006c93df5dSYan, Zheng return -EIO; 12016c93df5dSYan, Zheng } 12026c93df5dSYan, Zheng 12031d3576fdSSage Weil retry_locked: 12041d3576fdSSage Weil /* writepages currently holds page lock, but if we change that later, */ 12051d3576fdSSage Weil wait_on_page_writeback(page); 12061d3576fdSSage Weil 120761600ef8SYan, Zheng snapc = page_snap_context(page); 120880e755feSSage Weil if (snapc && snapc != ci->i_head_snapc) { 12091d3576fdSSage Weil /* 12101d3576fdSSage Weil * this page is already dirty in another (older) snap 12111d3576fdSSage Weil * context! is it writeable now? 12121d3576fdSSage Weil */ 12135f743e45SYan, Zheng oldest = get_oldest_context(inode, NULL, NULL, NULL); 12141d3576fdSSage Weil 121580e755feSSage Weil if (snapc->seq > oldest->seq) { 12166298a337SSage Weil ceph_put_snap_context(oldest); 12171d3576fdSSage Weil dout(" page %p snapc %p not current or oldest\n", 12186298a337SSage Weil page, snapc); 12191d3576fdSSage Weil /* 12201d3576fdSSage Weil * queue for writeback, and wait for snapc to 12211d3576fdSSage Weil * be writeable or written 12221d3576fdSSage Weil */ 12236298a337SSage Weil snapc = ceph_get_snap_context(snapc); 12241d3576fdSSage Weil unlock_page(page); 12253c6f6b79SSage Weil ceph_queue_writeback(inode); 1226a78bbd4bSYan, Zheng r = wait_event_killable(ci->i_cap_wq, 12271d3576fdSSage Weil context_is_writeable_or_written(inode, snapc)); 12281d3576fdSSage Weil ceph_put_snap_context(snapc); 12298f883c24SSage Weil if (r == -ERESTARTSYS) 12308f883c24SSage Weil return r; 12314af6b225SYehuda Sadeh return -EAGAIN; 12321d3576fdSSage Weil } 12336298a337SSage Weil ceph_put_snap_context(oldest); 12341d3576fdSSage Weil 12351d3576fdSSage Weil /* yay, writeable, do it now (without dropping page lock) */ 12361d3576fdSSage Weil dout(" page %p snapc %p not current, but oldest\n", 12371d3576fdSSage Weil page, snapc); 12381d3576fdSSage Weil if (!clear_page_dirty_for_io(page)) 12391d3576fdSSage Weil goto retry_locked; 12401d3576fdSSage Weil r = writepage_nounlock(page, NULL); 12411d3576fdSSage Weil if (r < 0) 12421d3576fdSSage Weil goto fail_nosnap; 12431d3576fdSSage Weil goto retry_locked; 12441d3576fdSSage Weil } 12451d3576fdSSage Weil 12461d3576fdSSage Weil if (PageUptodate(page)) { 12471d3576fdSSage Weil dout(" page %p already uptodate\n", page); 12481d3576fdSSage Weil return 0; 12491d3576fdSSage Weil } 12501d3576fdSSage Weil 12511d3576fdSSage Weil /* full page? */ 125209cbfeafSKirill A. Shutemov if (pos_in_page == 0 && len == PAGE_SIZE) 12531d3576fdSSage Weil return 0; 12541d3576fdSSage Weil 12551d3576fdSSage Weil /* past end of file? */ 125699c88e69SYan, Zheng i_size = i_size_read(inode); 12571d3576fdSSage Weil 12581d3576fdSSage Weil if (page_off >= i_size || 12591d3576fdSSage Weil (pos_in_page == 0 && (pos+len) >= i_size && 126009cbfeafSKirill A. Shutemov end_in_page - pos_in_page != PAGE_SIZE)) { 12611d3576fdSSage Weil dout(" zeroing %p 0 - %d and %d - %d\n", 126209cbfeafSKirill A. Shutemov page, pos_in_page, end_in_page, (int)PAGE_SIZE); 12631d3576fdSSage Weil zero_user_segments(page, 12641d3576fdSSage Weil 0, pos_in_page, 126509cbfeafSKirill A. Shutemov end_in_page, PAGE_SIZE); 12661d3576fdSSage Weil return 0; 12671d3576fdSSage Weil } 12681d3576fdSSage Weil 12691d3576fdSSage Weil /* we need to read it. */ 12701d3576fdSSage Weil r = readpage_nounlock(file, page); 12711d3576fdSSage Weil if (r < 0) 12721d3576fdSSage Weil goto fail_nosnap; 12731d3576fdSSage Weil goto retry_locked; 12741d3576fdSSage Weil fail_nosnap: 12751d3576fdSSage Weil unlock_page(page); 12761d3576fdSSage Weil return r; 12771d3576fdSSage Weil } 12781d3576fdSSage Weil 12791d3576fdSSage Weil /* 12804af6b225SYehuda Sadeh * We are only allowed to write into/dirty the page if the page is 12814af6b225SYehuda Sadeh * clean, or already dirty within the same snap context. 12824af6b225SYehuda Sadeh */ 12834af6b225SYehuda Sadeh static int ceph_write_begin(struct file *file, struct address_space *mapping, 12844af6b225SYehuda Sadeh loff_t pos, unsigned len, unsigned flags, 12854af6b225SYehuda Sadeh struct page **pagep, void **fsdata) 12864af6b225SYehuda Sadeh { 1287496ad9aaSAl Viro struct inode *inode = file_inode(file); 12884af6b225SYehuda Sadeh struct page *page; 128909cbfeafSKirill A. Shutemov pgoff_t index = pos >> PAGE_SHIFT; 12907971bd92SSage Weil int r; 12914af6b225SYehuda Sadeh 12924af6b225SYehuda Sadeh do { 12934af6b225SYehuda Sadeh /* get a page */ 12944af6b225SYehuda Sadeh page = grab_cache_page_write_begin(mapping, index, 0); 12957971bd92SSage Weil if (!page) 12967971bd92SSage Weil return -ENOMEM; 12974af6b225SYehuda Sadeh 12984af6b225SYehuda Sadeh dout("write_begin file %p inode %p page %p %d~%d\n", file, 12994af6b225SYehuda Sadeh inode, page, (int)pos, (int)len); 13004af6b225SYehuda Sadeh 13014af6b225SYehuda Sadeh r = ceph_update_writeable_page(file, pos, len, page); 1302c1d00b2dSTaesoo Kim if (r < 0) 130309cbfeafSKirill A. Shutemov put_page(page); 1304c1d00b2dSTaesoo Kim else 1305c1d00b2dSTaesoo Kim *pagep = page; 13064af6b225SYehuda Sadeh } while (r == -EAGAIN); 13074af6b225SYehuda Sadeh 13084af6b225SYehuda Sadeh return r; 13094af6b225SYehuda Sadeh } 13104af6b225SYehuda Sadeh 13114af6b225SYehuda Sadeh /* 13121d3576fdSSage Weil * we don't do anything in here that simple_write_end doesn't do 13135dda377cSYan, Zheng * except adjust dirty page accounting 13141d3576fdSSage Weil */ 13151d3576fdSSage Weil static int ceph_write_end(struct file *file, struct address_space *mapping, 13161d3576fdSSage Weil loff_t pos, unsigned len, unsigned copied, 13171d3576fdSSage Weil struct page *page, void *fsdata) 13181d3576fdSSage Weil { 1319496ad9aaSAl Viro struct inode *inode = file_inode(file); 13201d3576fdSSage Weil int check_cap = 0; 13211d3576fdSSage Weil 13221d3576fdSSage Weil dout("write_end file %p inode %p page %p %d~%d (%d)\n", file, 13231d3576fdSSage Weil inode, page, (int)pos, (int)copied, (int)len); 13241d3576fdSSage Weil 13251d3576fdSSage Weil /* zero the stale part of the page if we did a short copy */ 1326b9de313cSAl Viro if (!PageUptodate(page)) { 1327b9de313cSAl Viro if (copied < len) { 1328b9de313cSAl Viro copied = 0; 1329b9de313cSAl Viro goto out; 1330b9de313cSAl Viro } 1331b9de313cSAl Viro SetPageUptodate(page); 1332b9de313cSAl Viro } 13331d3576fdSSage Weil 13341d3576fdSSage Weil /* did file size increase? */ 133599c88e69SYan, Zheng if (pos+copied > i_size_read(inode)) 13361d3576fdSSage Weil check_cap = ceph_inode_set_size(inode, pos+copied); 13371d3576fdSSage Weil 13381d3576fdSSage Weil set_page_dirty(page); 13391d3576fdSSage Weil 1340b9de313cSAl Viro out: 13411d3576fdSSage Weil unlock_page(page); 134209cbfeafSKirill A. Shutemov put_page(page); 13431d3576fdSSage Weil 13441d3576fdSSage Weil if (check_cap) 13451d3576fdSSage Weil ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY, NULL); 13461d3576fdSSage Weil 13471d3576fdSSage Weil return copied; 13481d3576fdSSage Weil } 13491d3576fdSSage Weil 13501d3576fdSSage Weil /* 13511d3576fdSSage Weil * we set .direct_IO to indicate direct io is supported, but since we 13521d3576fdSSage Weil * intercept O_DIRECT reads and writes early, this function should 13531d3576fdSSage Weil * never get called. 13541d3576fdSSage Weil */ 1355c8b8e32dSChristoph Hellwig static ssize_t ceph_direct_io(struct kiocb *iocb, struct iov_iter *iter) 13561d3576fdSSage Weil { 13571d3576fdSSage Weil WARN_ON(1); 13581d3576fdSSage Weil return -EINVAL; 13591d3576fdSSage Weil } 13601d3576fdSSage Weil 13611d3576fdSSage Weil const struct address_space_operations ceph_aops = { 13621d3576fdSSage Weil .readpage = ceph_readpage, 13631d3576fdSSage Weil .readpages = ceph_readpages, 13641d3576fdSSage Weil .writepage = ceph_writepage, 13651d3576fdSSage Weil .writepages = ceph_writepages_start, 13661d3576fdSSage Weil .write_begin = ceph_write_begin, 13671d3576fdSSage Weil .write_end = ceph_write_end, 13681d3576fdSSage Weil .set_page_dirty = ceph_set_page_dirty, 13691d3576fdSSage Weil .invalidatepage = ceph_invalidatepage, 13701d3576fdSSage Weil .releasepage = ceph_releasepage, 13711d3576fdSSage Weil .direct_IO = ceph_direct_io, 13721d3576fdSSage Weil }; 13731d3576fdSSage Weil 13744f7e89f6SYan, Zheng static void ceph_block_sigs(sigset_t *oldset) 13754f7e89f6SYan, Zheng { 13764f7e89f6SYan, Zheng sigset_t mask; 13774f7e89f6SYan, Zheng siginitsetinv(&mask, sigmask(SIGKILL)); 13784f7e89f6SYan, Zheng sigprocmask(SIG_BLOCK, &mask, oldset); 13794f7e89f6SYan, Zheng } 13804f7e89f6SYan, Zheng 13814f7e89f6SYan, Zheng static void ceph_restore_sigs(sigset_t *oldset) 13824f7e89f6SYan, Zheng { 13834f7e89f6SYan, Zheng sigprocmask(SIG_SETMASK, oldset, NULL); 13844f7e89f6SYan, Zheng } 13851d3576fdSSage Weil 13861d3576fdSSage Weil /* 13871d3576fdSSage Weil * vm ops 13881d3576fdSSage Weil */ 138911bac800SDave Jiang static int ceph_filemap_fault(struct vm_fault *vmf) 139061f68816SYan, Zheng { 139111bac800SDave Jiang struct vm_area_struct *vma = vmf->vma; 139261f68816SYan, Zheng struct inode *inode = file_inode(vma->vm_file); 139361f68816SYan, Zheng struct ceph_inode_info *ci = ceph_inode(inode); 139461f68816SYan, Zheng struct ceph_file_info *fi = vma->vm_file->private_data; 13953738daa6SYan, Zheng struct page *pinned_page = NULL; 139609cbfeafSKirill A. Shutemov loff_t off = vmf->pgoff << PAGE_SHIFT; 139761f68816SYan, Zheng int want, got, ret; 13984f7e89f6SYan, Zheng sigset_t oldset; 13994f7e89f6SYan, Zheng 14004f7e89f6SYan, Zheng ceph_block_sigs(&oldset); 140161f68816SYan, Zheng 140261f68816SYan, Zheng dout("filemap_fault %p %llx.%llx %llu~%zd trying to get caps\n", 140309cbfeafSKirill A. Shutemov inode, ceph_vinop(inode), off, (size_t)PAGE_SIZE); 140461f68816SYan, Zheng if (fi->fmode & CEPH_FILE_MODE_LAZY) 140561f68816SYan, Zheng want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO; 140661f68816SYan, Zheng else 140761f68816SYan, Zheng want = CEPH_CAP_FILE_CACHE; 14084f7e89f6SYan, Zheng 140961f68816SYan, Zheng got = 0; 14104f7e89f6SYan, Zheng ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, -1, &got, &pinned_page); 14116ce026e4SYan, Zheng if (ret < 0) 14124f7e89f6SYan, Zheng goto out_restore; 14136ce026e4SYan, Zheng 141461f68816SYan, Zheng dout("filemap_fault %p %llu~%zd got cap refs on %s\n", 141509cbfeafSKirill A. Shutemov inode, off, (size_t)PAGE_SIZE, ceph_cap_string(got)); 141661f68816SYan, Zheng 141783701246SYan, Zheng if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) || 14182b1ac852SYan, Zheng ci->i_inline_version == CEPH_INLINE_NONE) { 14192b1ac852SYan, Zheng current->journal_info = vma->vm_file; 142011bac800SDave Jiang ret = filemap_fault(vmf); 14212b1ac852SYan, Zheng current->journal_info = NULL; 14222b1ac852SYan, Zheng } else 142383701246SYan, Zheng ret = -EAGAIN; 142461f68816SYan, Zheng 142561f68816SYan, Zheng dout("filemap_fault %p %llu~%zd dropping cap refs on %s ret %d\n", 142609cbfeafSKirill A. Shutemov inode, off, (size_t)PAGE_SIZE, ceph_cap_string(got), ret); 14273738daa6SYan, Zheng if (pinned_page) 142809cbfeafSKirill A. Shutemov put_page(pinned_page); 142961f68816SYan, Zheng ceph_put_cap_refs(ci, got); 143061f68816SYan, Zheng 143183701246SYan, Zheng if (ret != -EAGAIN) 14324f7e89f6SYan, Zheng goto out_restore; 143383701246SYan, Zheng 143483701246SYan, Zheng /* read inline data */ 143509cbfeafSKirill A. Shutemov if (off >= PAGE_SIZE) { 143683701246SYan, Zheng /* does not support inline data > PAGE_SIZE */ 143783701246SYan, Zheng ret = VM_FAULT_SIGBUS; 143883701246SYan, Zheng } else { 143983701246SYan, Zheng int ret1; 144083701246SYan, Zheng struct address_space *mapping = inode->i_mapping; 144183701246SYan, Zheng struct page *page = find_or_create_page(mapping, 0, 1442c62d2555SMichal Hocko mapping_gfp_constraint(mapping, 1443c62d2555SMichal Hocko ~__GFP_FS)); 144483701246SYan, Zheng if (!page) { 144583701246SYan, Zheng ret = VM_FAULT_OOM; 14464f7e89f6SYan, Zheng goto out_inline; 144783701246SYan, Zheng } 144883701246SYan, Zheng ret1 = __ceph_do_getattr(inode, page, 144983701246SYan, Zheng CEPH_STAT_CAP_INLINE_DATA, true); 145083701246SYan, Zheng if (ret1 < 0 || off >= i_size_read(inode)) { 145183701246SYan, Zheng unlock_page(page); 145209cbfeafSKirill A. Shutemov put_page(page); 14536ce026e4SYan, Zheng if (ret1 < 0) 14546ce026e4SYan, Zheng ret = ret1; 14556ce026e4SYan, Zheng else 145683701246SYan, Zheng ret = VM_FAULT_SIGBUS; 14574f7e89f6SYan, Zheng goto out_inline; 145883701246SYan, Zheng } 145909cbfeafSKirill A. Shutemov if (ret1 < PAGE_SIZE) 146009cbfeafSKirill A. Shutemov zero_user_segment(page, ret1, PAGE_SIZE); 146183701246SYan, Zheng else 146283701246SYan, Zheng flush_dcache_page(page); 146383701246SYan, Zheng SetPageUptodate(page); 146483701246SYan, Zheng vmf->page = page; 146583701246SYan, Zheng ret = VM_FAULT_MAJOR | VM_FAULT_LOCKED; 14664f7e89f6SYan, Zheng out_inline: 146783701246SYan, Zheng dout("filemap_fault %p %llu~%zd read inline data ret %d\n", 146809cbfeafSKirill A. Shutemov inode, off, (size_t)PAGE_SIZE, ret); 14694f7e89f6SYan, Zheng } 14704f7e89f6SYan, Zheng out_restore: 14714f7e89f6SYan, Zheng ceph_restore_sigs(&oldset); 14726ce026e4SYan, Zheng if (ret < 0) 14736ce026e4SYan, Zheng ret = (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS; 14746ce026e4SYan, Zheng 147561f68816SYan, Zheng return ret; 147661f68816SYan, Zheng } 14771d3576fdSSage Weil 14781d3576fdSSage Weil /* 14791d3576fdSSage Weil * Reuse write_begin here for simplicity. 14801d3576fdSSage Weil */ 148111bac800SDave Jiang static int ceph_page_mkwrite(struct vm_fault *vmf) 14821d3576fdSSage Weil { 148311bac800SDave Jiang struct vm_area_struct *vma = vmf->vma; 1484496ad9aaSAl Viro struct inode *inode = file_inode(vma->vm_file); 148561f68816SYan, Zheng struct ceph_inode_info *ci = ceph_inode(inode); 148661f68816SYan, Zheng struct ceph_file_info *fi = vma->vm_file->private_data; 1487f66fd9f0SYan, Zheng struct ceph_cap_flush *prealloc_cf; 148861f68816SYan, Zheng struct page *page = vmf->page; 14896285bc23SAlex Elder loff_t off = page_offset(page); 149061f68816SYan, Zheng loff_t size = i_size_read(inode); 149161f68816SYan, Zheng size_t len; 149261f68816SYan, Zheng int want, got, ret; 14934f7e89f6SYan, Zheng sigset_t oldset; 14941d3576fdSSage Weil 1495f66fd9f0SYan, Zheng prealloc_cf = ceph_alloc_cap_flush(); 1496f66fd9f0SYan, Zheng if (!prealloc_cf) 14976ce026e4SYan, Zheng return VM_FAULT_OOM; 1498f66fd9f0SYan, Zheng 14994f7e89f6SYan, Zheng ceph_block_sigs(&oldset); 15001d3576fdSSage Weil 150128127bddSYan, Zheng if (ci->i_inline_version != CEPH_INLINE_NONE) { 150228127bddSYan, Zheng struct page *locked_page = NULL; 150328127bddSYan, Zheng if (off == 0) { 150428127bddSYan, Zheng lock_page(page); 150528127bddSYan, Zheng locked_page = page; 150628127bddSYan, Zheng } 150728127bddSYan, Zheng ret = ceph_uninline_data(vma->vm_file, locked_page); 150828127bddSYan, Zheng if (locked_page) 150928127bddSYan, Zheng unlock_page(locked_page); 15106ce026e4SYan, Zheng if (ret < 0) 1511f66fd9f0SYan, Zheng goto out_free; 1512f66fd9f0SYan, Zheng } 151328127bddSYan, Zheng 151409cbfeafSKirill A. Shutemov if (off + PAGE_SIZE <= size) 151509cbfeafSKirill A. Shutemov len = PAGE_SIZE; 15161d3576fdSSage Weil else 151709cbfeafSKirill A. Shutemov len = size & ~PAGE_MASK; 15181d3576fdSSage Weil 151961f68816SYan, Zheng dout("page_mkwrite %p %llx.%llx %llu~%zd getting caps i_size %llu\n", 152061f68816SYan, Zheng inode, ceph_vinop(inode), off, len, size); 152161f68816SYan, Zheng if (fi->fmode & CEPH_FILE_MODE_LAZY) 152261f68816SYan, Zheng want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; 152361f68816SYan, Zheng else 152461f68816SYan, Zheng want = CEPH_CAP_FILE_BUFFER; 15254f7e89f6SYan, Zheng 152661f68816SYan, Zheng got = 0; 15273738daa6SYan, Zheng ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, off + len, 15283738daa6SYan, Zheng &got, NULL); 15296ce026e4SYan, Zheng if (ret < 0) 1530f66fd9f0SYan, Zheng goto out_free; 15316ce026e4SYan, Zheng 153261f68816SYan, Zheng dout("page_mkwrite %p %llu~%zd got cap refs on %s\n", 153361f68816SYan, Zheng inode, off, len, ceph_cap_string(got)); 153461f68816SYan, Zheng 153561f68816SYan, Zheng /* Update time before taking page lock */ 153661f68816SYan, Zheng file_update_time(vma->vm_file); 15374af6b225SYehuda Sadeh 1538f0b33df5SYan, Zheng do { 15394af6b225SYehuda Sadeh lock_page(page); 15404af6b225SYehuda Sadeh 15416ce026e4SYan, Zheng if ((off > size) || (page->mapping != inode->i_mapping)) { 1542f9cac5acSYan, Zheng unlock_page(page); 15436ce026e4SYan, Zheng ret = VM_FAULT_NOPAGE; 1544f0b33df5SYan, Zheng break; 1545f9cac5acSYan, Zheng } 15464af6b225SYehuda Sadeh 15474af6b225SYehuda Sadeh ret = ceph_update_writeable_page(vma->vm_file, off, len, page); 1548f9cac5acSYan, Zheng if (ret >= 0) { 15494af6b225SYehuda Sadeh /* success. we'll keep the page locked. */ 15501d3576fdSSage Weil set_page_dirty(page); 15511d3576fdSSage Weil ret = VM_FAULT_LOCKED; 15521d3576fdSSage Weil } 1553f0b33df5SYan, Zheng } while (ret == -EAGAIN); 1554f0b33df5SYan, Zheng 155528127bddSYan, Zheng if (ret == VM_FAULT_LOCKED || 155628127bddSYan, Zheng ci->i_inline_version != CEPH_INLINE_NONE) { 155761f68816SYan, Zheng int dirty; 155861f68816SYan, Zheng spin_lock(&ci->i_ceph_lock); 155928127bddSYan, Zheng ci->i_inline_version = CEPH_INLINE_NONE; 1560f66fd9f0SYan, Zheng dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR, 1561f66fd9f0SYan, Zheng &prealloc_cf); 156261f68816SYan, Zheng spin_unlock(&ci->i_ceph_lock); 156361f68816SYan, Zheng if (dirty) 156461f68816SYan, Zheng __mark_inode_dirty(inode, dirty); 156561f68816SYan, Zheng } 156661f68816SYan, Zheng 156761f68816SYan, Zheng dout("page_mkwrite %p %llu~%zd dropping cap refs on %s ret %d\n", 156861f68816SYan, Zheng inode, off, len, ceph_cap_string(got), ret); 156961f68816SYan, Zheng ceph_put_cap_refs(ci, got); 1570f66fd9f0SYan, Zheng out_free: 15714f7e89f6SYan, Zheng ceph_restore_sigs(&oldset); 1572f66fd9f0SYan, Zheng ceph_free_cap_flush(prealloc_cf); 15736ce026e4SYan, Zheng if (ret < 0) 15746ce026e4SYan, Zheng ret = (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS; 15751d3576fdSSage Weil return ret; 15761d3576fdSSage Weil } 15771d3576fdSSage Weil 157831c542a1SYan, Zheng void ceph_fill_inline_data(struct inode *inode, struct page *locked_page, 157931c542a1SYan, Zheng char *data, size_t len) 158031c542a1SYan, Zheng { 158131c542a1SYan, Zheng struct address_space *mapping = inode->i_mapping; 158231c542a1SYan, Zheng struct page *page; 158331c542a1SYan, Zheng 158431c542a1SYan, Zheng if (locked_page) { 158531c542a1SYan, Zheng page = locked_page; 158631c542a1SYan, Zheng } else { 158731c542a1SYan, Zheng if (i_size_read(inode) == 0) 158831c542a1SYan, Zheng return; 158931c542a1SYan, Zheng page = find_or_create_page(mapping, 0, 1590c62d2555SMichal Hocko mapping_gfp_constraint(mapping, 1591c62d2555SMichal Hocko ~__GFP_FS)); 159231c542a1SYan, Zheng if (!page) 159331c542a1SYan, Zheng return; 159431c542a1SYan, Zheng if (PageUptodate(page)) { 159531c542a1SYan, Zheng unlock_page(page); 159609cbfeafSKirill A. Shutemov put_page(page); 159731c542a1SYan, Zheng return; 159831c542a1SYan, Zheng } 159931c542a1SYan, Zheng } 160031c542a1SYan, Zheng 16010668ff52SIlya Dryomov dout("fill_inline_data %p %llx.%llx len %zu locked_page %p\n", 160231c542a1SYan, Zheng inode, ceph_vinop(inode), len, locked_page); 160331c542a1SYan, Zheng 160431c542a1SYan, Zheng if (len > 0) { 160531c542a1SYan, Zheng void *kaddr = kmap_atomic(page); 160631c542a1SYan, Zheng memcpy(kaddr, data, len); 160731c542a1SYan, Zheng kunmap_atomic(kaddr); 160831c542a1SYan, Zheng } 160931c542a1SYan, Zheng 161031c542a1SYan, Zheng if (page != locked_page) { 161109cbfeafSKirill A. Shutemov if (len < PAGE_SIZE) 161209cbfeafSKirill A. Shutemov zero_user_segment(page, len, PAGE_SIZE); 161331c542a1SYan, Zheng else 161431c542a1SYan, Zheng flush_dcache_page(page); 161531c542a1SYan, Zheng 161631c542a1SYan, Zheng SetPageUptodate(page); 161731c542a1SYan, Zheng unlock_page(page); 161809cbfeafSKirill A. Shutemov put_page(page); 161931c542a1SYan, Zheng } 162031c542a1SYan, Zheng } 162131c542a1SYan, Zheng 162228127bddSYan, Zheng int ceph_uninline_data(struct file *filp, struct page *locked_page) 162328127bddSYan, Zheng { 162428127bddSYan, Zheng struct inode *inode = file_inode(filp); 162528127bddSYan, Zheng struct ceph_inode_info *ci = ceph_inode(inode); 162628127bddSYan, Zheng struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 162728127bddSYan, Zheng struct ceph_osd_request *req; 162828127bddSYan, Zheng struct page *page = NULL; 162928127bddSYan, Zheng u64 len, inline_version; 163028127bddSYan, Zheng int err = 0; 163128127bddSYan, Zheng bool from_pagecache = false; 163228127bddSYan, Zheng 163328127bddSYan, Zheng spin_lock(&ci->i_ceph_lock); 163428127bddSYan, Zheng inline_version = ci->i_inline_version; 163528127bddSYan, Zheng spin_unlock(&ci->i_ceph_lock); 163628127bddSYan, Zheng 163728127bddSYan, Zheng dout("uninline_data %p %llx.%llx inline_version %llu\n", 163828127bddSYan, Zheng inode, ceph_vinop(inode), inline_version); 163928127bddSYan, Zheng 164028127bddSYan, Zheng if (inline_version == 1 || /* initial version, no data */ 164128127bddSYan, Zheng inline_version == CEPH_INLINE_NONE) 164228127bddSYan, Zheng goto out; 164328127bddSYan, Zheng 164428127bddSYan, Zheng if (locked_page) { 164528127bddSYan, Zheng page = locked_page; 164628127bddSYan, Zheng WARN_ON(!PageUptodate(page)); 164728127bddSYan, Zheng } else if (ceph_caps_issued(ci) & 164828127bddSYan, Zheng (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) { 164928127bddSYan, Zheng page = find_get_page(inode->i_mapping, 0); 165028127bddSYan, Zheng if (page) { 165128127bddSYan, Zheng if (PageUptodate(page)) { 165228127bddSYan, Zheng from_pagecache = true; 165328127bddSYan, Zheng lock_page(page); 165428127bddSYan, Zheng } else { 165509cbfeafSKirill A. Shutemov put_page(page); 165628127bddSYan, Zheng page = NULL; 165728127bddSYan, Zheng } 165828127bddSYan, Zheng } 165928127bddSYan, Zheng } 166028127bddSYan, Zheng 166128127bddSYan, Zheng if (page) { 166228127bddSYan, Zheng len = i_size_read(inode); 166309cbfeafSKirill A. Shutemov if (len > PAGE_SIZE) 166409cbfeafSKirill A. Shutemov len = PAGE_SIZE; 166528127bddSYan, Zheng } else { 166628127bddSYan, Zheng page = __page_cache_alloc(GFP_NOFS); 166728127bddSYan, Zheng if (!page) { 166828127bddSYan, Zheng err = -ENOMEM; 166928127bddSYan, Zheng goto out; 167028127bddSYan, Zheng } 167128127bddSYan, Zheng err = __ceph_do_getattr(inode, page, 167228127bddSYan, Zheng CEPH_STAT_CAP_INLINE_DATA, true); 167328127bddSYan, Zheng if (err < 0) { 167428127bddSYan, Zheng /* no inline data */ 167528127bddSYan, Zheng if (err == -ENODATA) 167628127bddSYan, Zheng err = 0; 167728127bddSYan, Zheng goto out; 167828127bddSYan, Zheng } 167928127bddSYan, Zheng len = err; 168028127bddSYan, Zheng } 168128127bddSYan, Zheng 168228127bddSYan, Zheng req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, 168328127bddSYan, Zheng ceph_vino(inode), 0, &len, 0, 1, 168428127bddSYan, Zheng CEPH_OSD_OP_CREATE, 168528127bddSYan, Zheng CEPH_OSD_FLAG_ONDISK | CEPH_OSD_FLAG_WRITE, 168634b759b4SIlya Dryomov NULL, 0, 0, false); 168728127bddSYan, Zheng if (IS_ERR(req)) { 168828127bddSYan, Zheng err = PTR_ERR(req); 168928127bddSYan, Zheng goto out; 169028127bddSYan, Zheng } 169128127bddSYan, Zheng 1692bb873b53SIlya Dryomov req->r_mtime = inode->i_mtime; 169328127bddSYan, Zheng err = ceph_osdc_start_request(&fsc->client->osdc, req, false); 169428127bddSYan, Zheng if (!err) 169528127bddSYan, Zheng err = ceph_osdc_wait_request(&fsc->client->osdc, req); 169628127bddSYan, Zheng ceph_osdc_put_request(req); 169728127bddSYan, Zheng if (err < 0) 169828127bddSYan, Zheng goto out; 169928127bddSYan, Zheng 170028127bddSYan, Zheng req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, 170128127bddSYan, Zheng ceph_vino(inode), 0, &len, 1, 3, 170228127bddSYan, Zheng CEPH_OSD_OP_WRITE, 170328127bddSYan, Zheng CEPH_OSD_FLAG_ONDISK | CEPH_OSD_FLAG_WRITE, 170434b759b4SIlya Dryomov NULL, ci->i_truncate_seq, 170534b759b4SIlya Dryomov ci->i_truncate_size, false); 170628127bddSYan, Zheng if (IS_ERR(req)) { 170728127bddSYan, Zheng err = PTR_ERR(req); 170828127bddSYan, Zheng goto out; 170928127bddSYan, Zheng } 171028127bddSYan, Zheng 171128127bddSYan, Zheng osd_req_op_extent_osd_data_pages(req, 1, &page, len, 0, false, false); 171228127bddSYan, Zheng 1713ec137c10SYan, Zheng { 1714ec137c10SYan, Zheng __le64 xattr_buf = cpu_to_le64(inline_version); 171528127bddSYan, Zheng err = osd_req_op_xattr_init(req, 0, CEPH_OSD_OP_CMPXATTR, 1716ec137c10SYan, Zheng "inline_version", &xattr_buf, 1717ec137c10SYan, Zheng sizeof(xattr_buf), 171828127bddSYan, Zheng CEPH_OSD_CMPXATTR_OP_GT, 171928127bddSYan, Zheng CEPH_OSD_CMPXATTR_MODE_U64); 172028127bddSYan, Zheng if (err) 172128127bddSYan, Zheng goto out_put; 1722ec137c10SYan, Zheng } 172328127bddSYan, Zheng 1724ec137c10SYan, Zheng { 1725ec137c10SYan, Zheng char xattr_buf[32]; 1726ec137c10SYan, Zheng int xattr_len = snprintf(xattr_buf, sizeof(xattr_buf), 1727ec137c10SYan, Zheng "%llu", inline_version); 172828127bddSYan, Zheng err = osd_req_op_xattr_init(req, 2, CEPH_OSD_OP_SETXATTR, 1729ec137c10SYan, Zheng "inline_version", 1730ec137c10SYan, Zheng xattr_buf, xattr_len, 0, 0); 173128127bddSYan, Zheng if (err) 173228127bddSYan, Zheng goto out_put; 1733ec137c10SYan, Zheng } 173428127bddSYan, Zheng 1735bb873b53SIlya Dryomov req->r_mtime = inode->i_mtime; 173628127bddSYan, Zheng err = ceph_osdc_start_request(&fsc->client->osdc, req, false); 173728127bddSYan, Zheng if (!err) 173828127bddSYan, Zheng err = ceph_osdc_wait_request(&fsc->client->osdc, req); 173928127bddSYan, Zheng out_put: 174028127bddSYan, Zheng ceph_osdc_put_request(req); 174128127bddSYan, Zheng if (err == -ECANCELED) 174228127bddSYan, Zheng err = 0; 174328127bddSYan, Zheng out: 174428127bddSYan, Zheng if (page && page != locked_page) { 174528127bddSYan, Zheng if (from_pagecache) { 174628127bddSYan, Zheng unlock_page(page); 174709cbfeafSKirill A. Shutemov put_page(page); 174828127bddSYan, Zheng } else 174928127bddSYan, Zheng __free_pages(page, 0); 175028127bddSYan, Zheng } 175128127bddSYan, Zheng 175228127bddSYan, Zheng dout("uninline_data %p %llx.%llx inline_version %llu = %d\n", 175328127bddSYan, Zheng inode, ceph_vinop(inode), inline_version, err); 175428127bddSYan, Zheng return err; 175528127bddSYan, Zheng } 175628127bddSYan, Zheng 17577cbea8dcSKirill A. Shutemov static const struct vm_operations_struct ceph_vmops = { 175861f68816SYan, Zheng .fault = ceph_filemap_fault, 17591d3576fdSSage Weil .page_mkwrite = ceph_page_mkwrite, 17601d3576fdSSage Weil }; 17611d3576fdSSage Weil 17621d3576fdSSage Weil int ceph_mmap(struct file *file, struct vm_area_struct *vma) 17631d3576fdSSage Weil { 17641d3576fdSSage Weil struct address_space *mapping = file->f_mapping; 17651d3576fdSSage Weil 17661d3576fdSSage Weil if (!mapping->a_ops->readpage) 17671d3576fdSSage Weil return -ENOEXEC; 17681d3576fdSSage Weil file_accessed(file); 17691d3576fdSSage Weil vma->vm_ops = &ceph_vmops; 17701d3576fdSSage Weil return 0; 17711d3576fdSSage Weil } 177210183a69SYan, Zheng 177310183a69SYan, Zheng enum { 177410183a69SYan, Zheng POOL_READ = 1, 177510183a69SYan, Zheng POOL_WRITE = 2, 177610183a69SYan, Zheng }; 177710183a69SYan, Zheng 1778779fe0fbSYan, Zheng static int __ceph_pool_perm_get(struct ceph_inode_info *ci, 1779779fe0fbSYan, Zheng s64 pool, struct ceph_string *pool_ns) 178010183a69SYan, Zheng { 178110183a69SYan, Zheng struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->vfs_inode); 178210183a69SYan, Zheng struct ceph_mds_client *mdsc = fsc->mdsc; 178310183a69SYan, Zheng struct ceph_osd_request *rd_req = NULL, *wr_req = NULL; 178410183a69SYan, Zheng struct rb_node **p, *parent; 178510183a69SYan, Zheng struct ceph_pool_perm *perm; 178610183a69SYan, Zheng struct page **pages; 1787779fe0fbSYan, Zheng size_t pool_ns_len; 178810183a69SYan, Zheng int err = 0, err2 = 0, have = 0; 178910183a69SYan, Zheng 179010183a69SYan, Zheng down_read(&mdsc->pool_perm_rwsem); 179110183a69SYan, Zheng p = &mdsc->pool_perm_tree.rb_node; 179210183a69SYan, Zheng while (*p) { 179310183a69SYan, Zheng perm = rb_entry(*p, struct ceph_pool_perm, node); 179410183a69SYan, Zheng if (pool < perm->pool) 179510183a69SYan, Zheng p = &(*p)->rb_left; 179610183a69SYan, Zheng else if (pool > perm->pool) 179710183a69SYan, Zheng p = &(*p)->rb_right; 179810183a69SYan, Zheng else { 1799779fe0fbSYan, Zheng int ret = ceph_compare_string(pool_ns, 1800779fe0fbSYan, Zheng perm->pool_ns, 1801779fe0fbSYan, Zheng perm->pool_ns_len); 1802779fe0fbSYan, Zheng if (ret < 0) 1803779fe0fbSYan, Zheng p = &(*p)->rb_left; 1804779fe0fbSYan, Zheng else if (ret > 0) 1805779fe0fbSYan, Zheng p = &(*p)->rb_right; 1806779fe0fbSYan, Zheng else { 180710183a69SYan, Zheng have = perm->perm; 180810183a69SYan, Zheng break; 180910183a69SYan, Zheng } 181010183a69SYan, Zheng } 1811779fe0fbSYan, Zheng } 181210183a69SYan, Zheng up_read(&mdsc->pool_perm_rwsem); 181310183a69SYan, Zheng if (*p) 181410183a69SYan, Zheng goto out; 181510183a69SYan, Zheng 1816779fe0fbSYan, Zheng if (pool_ns) 1817779fe0fbSYan, Zheng dout("__ceph_pool_perm_get pool %lld ns %.*s no perm cached\n", 1818779fe0fbSYan, Zheng pool, (int)pool_ns->len, pool_ns->str); 1819779fe0fbSYan, Zheng else 18207627151eSYan, Zheng dout("__ceph_pool_perm_get pool %lld no perm cached\n", pool); 182110183a69SYan, Zheng 182210183a69SYan, Zheng down_write(&mdsc->pool_perm_rwsem); 1823779fe0fbSYan, Zheng p = &mdsc->pool_perm_tree.rb_node; 182410183a69SYan, Zheng parent = NULL; 182510183a69SYan, Zheng while (*p) { 182610183a69SYan, Zheng parent = *p; 182710183a69SYan, Zheng perm = rb_entry(parent, struct ceph_pool_perm, node); 182810183a69SYan, Zheng if (pool < perm->pool) 182910183a69SYan, Zheng p = &(*p)->rb_left; 183010183a69SYan, Zheng else if (pool > perm->pool) 183110183a69SYan, Zheng p = &(*p)->rb_right; 183210183a69SYan, Zheng else { 1833779fe0fbSYan, Zheng int ret = ceph_compare_string(pool_ns, 1834779fe0fbSYan, Zheng perm->pool_ns, 1835779fe0fbSYan, Zheng perm->pool_ns_len); 1836779fe0fbSYan, Zheng if (ret < 0) 1837779fe0fbSYan, Zheng p = &(*p)->rb_left; 1838779fe0fbSYan, Zheng else if (ret > 0) 1839779fe0fbSYan, Zheng p = &(*p)->rb_right; 1840779fe0fbSYan, Zheng else { 184110183a69SYan, Zheng have = perm->perm; 184210183a69SYan, Zheng break; 184310183a69SYan, Zheng } 184410183a69SYan, Zheng } 1845779fe0fbSYan, Zheng } 184610183a69SYan, Zheng if (*p) { 184710183a69SYan, Zheng up_write(&mdsc->pool_perm_rwsem); 184810183a69SYan, Zheng goto out; 184910183a69SYan, Zheng } 185010183a69SYan, Zheng 185134b759b4SIlya Dryomov rd_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL, 185210183a69SYan, Zheng 1, false, GFP_NOFS); 185310183a69SYan, Zheng if (!rd_req) { 185410183a69SYan, Zheng err = -ENOMEM; 185510183a69SYan, Zheng goto out_unlock; 185610183a69SYan, Zheng } 185710183a69SYan, Zheng 185810183a69SYan, Zheng rd_req->r_flags = CEPH_OSD_FLAG_READ; 185910183a69SYan, Zheng osd_req_op_init(rd_req, 0, CEPH_OSD_OP_STAT, 0); 186010183a69SYan, Zheng rd_req->r_base_oloc.pool = pool; 1861779fe0fbSYan, Zheng if (pool_ns) 1862779fe0fbSYan, Zheng rd_req->r_base_oloc.pool_ns = ceph_get_string(pool_ns); 1863d30291b9SIlya Dryomov ceph_oid_printf(&rd_req->r_base_oid, "%llx.00000000", ci->i_vino.ino); 186410183a69SYan, Zheng 186513d1ad16SIlya Dryomov err = ceph_osdc_alloc_messages(rd_req, GFP_NOFS); 186613d1ad16SIlya Dryomov if (err) 186713d1ad16SIlya Dryomov goto out_unlock; 186810183a69SYan, Zheng 186934b759b4SIlya Dryomov wr_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL, 187010183a69SYan, Zheng 1, false, GFP_NOFS); 187110183a69SYan, Zheng if (!wr_req) { 187210183a69SYan, Zheng err = -ENOMEM; 187310183a69SYan, Zheng goto out_unlock; 187410183a69SYan, Zheng } 187510183a69SYan, Zheng 1876fe5da05eSIlya Dryomov wr_req->r_flags = CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ACK; 187710183a69SYan, Zheng osd_req_op_init(wr_req, 0, CEPH_OSD_OP_CREATE, CEPH_OSD_OP_FLAG_EXCL); 187863244fa1SIlya Dryomov ceph_oloc_copy(&wr_req->r_base_oloc, &rd_req->r_base_oloc); 1879d30291b9SIlya Dryomov ceph_oid_copy(&wr_req->r_base_oid, &rd_req->r_base_oid); 188010183a69SYan, Zheng 188113d1ad16SIlya Dryomov err = ceph_osdc_alloc_messages(wr_req, GFP_NOFS); 188213d1ad16SIlya Dryomov if (err) 188313d1ad16SIlya Dryomov goto out_unlock; 188410183a69SYan, Zheng 188510183a69SYan, Zheng /* one page should be large enough for STAT data */ 188610183a69SYan, Zheng pages = ceph_alloc_page_vector(1, GFP_KERNEL); 188710183a69SYan, Zheng if (IS_ERR(pages)) { 188810183a69SYan, Zheng err = PTR_ERR(pages); 188910183a69SYan, Zheng goto out_unlock; 189010183a69SYan, Zheng } 189110183a69SYan, Zheng 189210183a69SYan, Zheng osd_req_op_raw_data_in_pages(rd_req, 0, pages, PAGE_SIZE, 189310183a69SYan, Zheng 0, false, true); 189410183a69SYan, Zheng err = ceph_osdc_start_request(&fsc->client->osdc, rd_req, false); 189510183a69SYan, Zheng 1896bb873b53SIlya Dryomov wr_req->r_mtime = ci->vfs_inode.i_mtime; 189710183a69SYan, Zheng err2 = ceph_osdc_start_request(&fsc->client->osdc, wr_req, false); 189810183a69SYan, Zheng 189910183a69SYan, Zheng if (!err) 190010183a69SYan, Zheng err = ceph_osdc_wait_request(&fsc->client->osdc, rd_req); 190110183a69SYan, Zheng if (!err2) 190210183a69SYan, Zheng err2 = ceph_osdc_wait_request(&fsc->client->osdc, wr_req); 190310183a69SYan, Zheng 190410183a69SYan, Zheng if (err >= 0 || err == -ENOENT) 190510183a69SYan, Zheng have |= POOL_READ; 190610183a69SYan, Zheng else if (err != -EPERM) 190710183a69SYan, Zheng goto out_unlock; 190810183a69SYan, Zheng 190910183a69SYan, Zheng if (err2 == 0 || err2 == -EEXIST) 191010183a69SYan, Zheng have |= POOL_WRITE; 191110183a69SYan, Zheng else if (err2 != -EPERM) { 191210183a69SYan, Zheng err = err2; 191310183a69SYan, Zheng goto out_unlock; 191410183a69SYan, Zheng } 191510183a69SYan, Zheng 1916779fe0fbSYan, Zheng pool_ns_len = pool_ns ? pool_ns->len : 0; 1917779fe0fbSYan, Zheng perm = kmalloc(sizeof(*perm) + pool_ns_len + 1, GFP_NOFS); 191810183a69SYan, Zheng if (!perm) { 191910183a69SYan, Zheng err = -ENOMEM; 192010183a69SYan, Zheng goto out_unlock; 192110183a69SYan, Zheng } 192210183a69SYan, Zheng 192310183a69SYan, Zheng perm->pool = pool; 192410183a69SYan, Zheng perm->perm = have; 1925779fe0fbSYan, Zheng perm->pool_ns_len = pool_ns_len; 1926779fe0fbSYan, Zheng if (pool_ns_len > 0) 1927779fe0fbSYan, Zheng memcpy(perm->pool_ns, pool_ns->str, pool_ns_len); 1928779fe0fbSYan, Zheng perm->pool_ns[pool_ns_len] = 0; 1929779fe0fbSYan, Zheng 193010183a69SYan, Zheng rb_link_node(&perm->node, parent, p); 193110183a69SYan, Zheng rb_insert_color(&perm->node, &mdsc->pool_perm_tree); 193210183a69SYan, Zheng err = 0; 193310183a69SYan, Zheng out_unlock: 193410183a69SYan, Zheng up_write(&mdsc->pool_perm_rwsem); 193510183a69SYan, Zheng 193610183a69SYan, Zheng ceph_osdc_put_request(rd_req); 193710183a69SYan, Zheng ceph_osdc_put_request(wr_req); 193810183a69SYan, Zheng out: 193910183a69SYan, Zheng if (!err) 194010183a69SYan, Zheng err = have; 1941779fe0fbSYan, Zheng if (pool_ns) 1942779fe0fbSYan, Zheng dout("__ceph_pool_perm_get pool %lld ns %.*s result = %d\n", 1943779fe0fbSYan, Zheng pool, (int)pool_ns->len, pool_ns->str, err); 1944779fe0fbSYan, Zheng else 19457627151eSYan, Zheng dout("__ceph_pool_perm_get pool %lld result = %d\n", pool, err); 194610183a69SYan, Zheng return err; 194710183a69SYan, Zheng } 194810183a69SYan, Zheng 194910183a69SYan, Zheng int ceph_pool_perm_check(struct ceph_inode_info *ci, int need) 195010183a69SYan, Zheng { 19517627151eSYan, Zheng s64 pool; 1952779fe0fbSYan, Zheng struct ceph_string *pool_ns; 195310183a69SYan, Zheng int ret, flags; 195410183a69SYan, Zheng 195580e80fbbSYan, Zheng if (ci->i_vino.snap != CEPH_NOSNAP) { 195680e80fbbSYan, Zheng /* 195780e80fbbSYan, Zheng * Pool permission check needs to write to the first object. 195880e80fbbSYan, Zheng * But for snapshot, head of the first object may have alread 195980e80fbbSYan, Zheng * been deleted. Skip check to avoid creating orphan object. 196080e80fbbSYan, Zheng */ 196180e80fbbSYan, Zheng return 0; 196280e80fbbSYan, Zheng } 196380e80fbbSYan, Zheng 196410183a69SYan, Zheng if (ceph_test_mount_opt(ceph_inode_to_client(&ci->vfs_inode), 196510183a69SYan, Zheng NOPOOLPERM)) 196610183a69SYan, Zheng return 0; 196710183a69SYan, Zheng 196810183a69SYan, Zheng spin_lock(&ci->i_ceph_lock); 196910183a69SYan, Zheng flags = ci->i_ceph_flags; 19707627151eSYan, Zheng pool = ci->i_layout.pool_id; 197110183a69SYan, Zheng spin_unlock(&ci->i_ceph_lock); 197210183a69SYan, Zheng check: 197310183a69SYan, Zheng if (flags & CEPH_I_POOL_PERM) { 197410183a69SYan, Zheng if ((need & CEPH_CAP_FILE_RD) && !(flags & CEPH_I_POOL_RD)) { 19757627151eSYan, Zheng dout("ceph_pool_perm_check pool %lld no read perm\n", 197610183a69SYan, Zheng pool); 197710183a69SYan, Zheng return -EPERM; 197810183a69SYan, Zheng } 197910183a69SYan, Zheng if ((need & CEPH_CAP_FILE_WR) && !(flags & CEPH_I_POOL_WR)) { 19807627151eSYan, Zheng dout("ceph_pool_perm_check pool %lld no write perm\n", 198110183a69SYan, Zheng pool); 198210183a69SYan, Zheng return -EPERM; 198310183a69SYan, Zheng } 198410183a69SYan, Zheng return 0; 198510183a69SYan, Zheng } 198610183a69SYan, Zheng 1987779fe0fbSYan, Zheng pool_ns = ceph_try_get_string(ci->i_layout.pool_ns); 1988779fe0fbSYan, Zheng ret = __ceph_pool_perm_get(ci, pool, pool_ns); 1989779fe0fbSYan, Zheng ceph_put_string(pool_ns); 199010183a69SYan, Zheng if (ret < 0) 199110183a69SYan, Zheng return ret; 199210183a69SYan, Zheng 199310183a69SYan, Zheng flags = CEPH_I_POOL_PERM; 199410183a69SYan, Zheng if (ret & POOL_READ) 199510183a69SYan, Zheng flags |= CEPH_I_POOL_RD; 199610183a69SYan, Zheng if (ret & POOL_WRITE) 199710183a69SYan, Zheng flags |= CEPH_I_POOL_WR; 199810183a69SYan, Zheng 199910183a69SYan, Zheng spin_lock(&ci->i_ceph_lock); 2000779fe0fbSYan, Zheng if (pool == ci->i_layout.pool_id && 2001779fe0fbSYan, Zheng pool_ns == rcu_dereference_raw(ci->i_layout.pool_ns)) { 2002779fe0fbSYan, Zheng ci->i_ceph_flags |= flags; 200310183a69SYan, Zheng } else { 20047627151eSYan, Zheng pool = ci->i_layout.pool_id; 200510183a69SYan, Zheng flags = ci->i_ceph_flags; 200610183a69SYan, Zheng } 200710183a69SYan, Zheng spin_unlock(&ci->i_ceph_lock); 200810183a69SYan, Zheng goto check; 200910183a69SYan, Zheng } 201010183a69SYan, Zheng 201110183a69SYan, Zheng void ceph_pool_perm_destroy(struct ceph_mds_client *mdsc) 201210183a69SYan, Zheng { 201310183a69SYan, Zheng struct ceph_pool_perm *perm; 201410183a69SYan, Zheng struct rb_node *n; 201510183a69SYan, Zheng 201610183a69SYan, Zheng while (!RB_EMPTY_ROOT(&mdsc->pool_perm_tree)) { 201710183a69SYan, Zheng n = rb_first(&mdsc->pool_perm_tree); 201810183a69SYan, Zheng perm = rb_entry(n, struct ceph_pool_perm, node); 201910183a69SYan, Zheng rb_erase(n, &mdsc->pool_perm_tree); 202010183a69SYan, Zheng kfree(perm); 202110183a69SYan, Zheng } 202210183a69SYan, Zheng } 2023