11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * linux/fs/nfs/write.c 31da177e4SLinus Torvalds * 47c85d900STrond Myklebust * Write file data over NFS. 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * Copyright (C) 1996, 1997, Olaf Kirch <okir@monad.swb.de> 71da177e4SLinus Torvalds */ 81da177e4SLinus Torvalds 91da177e4SLinus Torvalds #include <linux/types.h> 101da177e4SLinus Torvalds #include <linux/slab.h> 111da177e4SLinus Torvalds #include <linux/mm.h> 121da177e4SLinus Torvalds #include <linux/pagemap.h> 131da177e4SLinus Torvalds #include <linux/file.h> 141da177e4SLinus Torvalds #include <linux/writeback.h> 1589a09141SPeter Zijlstra #include <linux/swap.h> 16074cc1deSTrond Myklebust #include <linux/migrate.h> 171da177e4SLinus Torvalds 181da177e4SLinus Torvalds #include <linux/sunrpc/clnt.h> 191da177e4SLinus Torvalds #include <linux/nfs_fs.h> 201da177e4SLinus Torvalds #include <linux/nfs_mount.h> 211da177e4SLinus Torvalds #include <linux/nfs_page.h> 223fcfab16SAndrew Morton #include <linux/backing-dev.h> 23afeacc8cSPaul Gortmaker #include <linux/export.h> 243fcfab16SAndrew Morton 251da177e4SLinus Torvalds #include <asm/uaccess.h> 261da177e4SLinus Torvalds 271da177e4SLinus Torvalds #include "delegation.h" 2849a70f27STrond Myklebust #include "internal.h" 2991d5b470SChuck Lever #include "iostat.h" 30def6ed7eSAndy Adamson #include "nfs4_fs.h" 31074cc1deSTrond Myklebust #include "fscache.h" 3294ad1c80SFred Isaman #include "pnfs.h" 331da177e4SLinus Torvalds 34f4ce1299STrond Myklebust #include "nfstrace.h" 35f4ce1299STrond Myklebust 361da177e4SLinus Torvalds #define NFSDBG_FACILITY NFSDBG_PAGECACHE 371da177e4SLinus Torvalds 381da177e4SLinus Torvalds #define MIN_POOL_WRITE (32) 391da177e4SLinus Torvalds #define MIN_POOL_COMMIT (4) 401da177e4SLinus Torvalds 411da177e4SLinus Torvalds /* 421da177e4SLinus Torvalds * Local function declarations 431da177e4SLinus Torvalds */ 44f8512ad0SFred Isaman static void nfs_redirty_request(struct nfs_page *req); 45788e7a89STrond Myklebust static const struct rpc_call_ops nfs_commit_ops; 46061ae2edSFred Isaman static const struct nfs_pgio_completion_ops nfs_async_write_completion_ops; 47f453a54aSFred Isaman static const struct nfs_commit_completion_ops nfs_commit_completion_ops; 484a0de55cSAnna Schumaker static const struct nfs_rw_ops nfs_rw_write_ops; 49d4581383SWeston Andros Adamson static void nfs_clear_request_commit(struct nfs_page *req); 5002d1426cSWeston Andros Adamson static void nfs_init_cinfo_from_inode(struct nfs_commit_info *cinfo, 5102d1426cSWeston Andros Adamson struct inode *inode); 521da177e4SLinus Torvalds 53e18b890bSChristoph Lameter static struct kmem_cache *nfs_wdata_cachep; 543feb2d49STrond Myklebust static mempool_t *nfs_wdata_mempool; 550b7c0153SFred Isaman static struct kmem_cache *nfs_cdata_cachep; 561da177e4SLinus Torvalds static mempool_t *nfs_commit_mempool; 571da177e4SLinus Torvalds 580b7c0153SFred Isaman struct nfs_commit_data *nfs_commitdata_alloc(void) 591da177e4SLinus Torvalds { 60192e501bSMel Gorman struct nfs_commit_data *p = mempool_alloc(nfs_commit_mempool, GFP_NOIO); 6140859d7eSChuck Lever 621da177e4SLinus Torvalds if (p) { 631da177e4SLinus Torvalds memset(p, 0, sizeof(*p)); 641da177e4SLinus Torvalds INIT_LIST_HEAD(&p->pages); 651da177e4SLinus Torvalds } 661da177e4SLinus Torvalds return p; 671da177e4SLinus Torvalds } 68e0c2b380SFred Isaman EXPORT_SYMBOL_GPL(nfs_commitdata_alloc); 691da177e4SLinus Torvalds 700b7c0153SFred Isaman void nfs_commit_free(struct nfs_commit_data *p) 711da177e4SLinus Torvalds { 721da177e4SLinus Torvalds mempool_free(p, nfs_commit_mempool); 731da177e4SLinus Torvalds } 74e0c2b380SFred Isaman EXPORT_SYMBOL_GPL(nfs_commit_free); 751da177e4SLinus Torvalds 761e7f3a48SWeston Andros Adamson static struct nfs_pgio_header *nfs_writehdr_alloc(void) 773feb2d49STrond Myklebust { 781e7f3a48SWeston Andros Adamson struct nfs_pgio_header *p = mempool_alloc(nfs_wdata_mempool, GFP_NOIO); 793feb2d49STrond Myklebust 804a0de55cSAnna Schumaker if (p) 813feb2d49STrond Myklebust memset(p, 0, sizeof(*p)); 823feb2d49STrond Myklebust return p; 833feb2d49STrond Myklebust } 843feb2d49STrond Myklebust 851e7f3a48SWeston Andros Adamson static void nfs_writehdr_free(struct nfs_pgio_header *hdr) 866c75dc0dSFred Isaman { 871e7f3a48SWeston Andros Adamson mempool_free(hdr, nfs_wdata_mempool); 883feb2d49STrond Myklebust } 891da177e4SLinus Torvalds 907b159fc1STrond Myklebust static void nfs_context_set_write_error(struct nfs_open_context *ctx, int error) 917b159fc1STrond Myklebust { 927b159fc1STrond Myklebust ctx->error = error; 937b159fc1STrond Myklebust smp_wmb(); 947b159fc1STrond Myklebust set_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); 957b159fc1STrond Myklebust } 967b159fc1STrond Myklebust 9784d3a9a9SWeston Andros Adamson /* 9802d1426cSWeston Andros Adamson * nfs_page_search_commits_for_head_request_locked 9902d1426cSWeston Andros Adamson * 10002d1426cSWeston Andros Adamson * Search through commit lists on @inode for the head request for @page. 10102d1426cSWeston Andros Adamson * Must be called while holding the inode (which is cinfo) lock. 10202d1426cSWeston Andros Adamson * 10302d1426cSWeston Andros Adamson * Returns the head request if found, or NULL if not found. 10402d1426cSWeston Andros Adamson */ 10502d1426cSWeston Andros Adamson static struct nfs_page * 10602d1426cSWeston Andros Adamson nfs_page_search_commits_for_head_request_locked(struct nfs_inode *nfsi, 10702d1426cSWeston Andros Adamson struct page *page) 10802d1426cSWeston Andros Adamson { 10902d1426cSWeston Andros Adamson struct nfs_page *freq, *t; 11002d1426cSWeston Andros Adamson struct nfs_commit_info cinfo; 11102d1426cSWeston Andros Adamson struct inode *inode = &nfsi->vfs_inode; 11202d1426cSWeston Andros Adamson 11302d1426cSWeston Andros Adamson nfs_init_cinfo_from_inode(&cinfo, inode); 11402d1426cSWeston Andros Adamson 11502d1426cSWeston Andros Adamson /* search through pnfs commit lists */ 11602d1426cSWeston Andros Adamson freq = pnfs_search_commit_reqs(inode, &cinfo, page); 11702d1426cSWeston Andros Adamson if (freq) 11802d1426cSWeston Andros Adamson return freq->wb_head; 11902d1426cSWeston Andros Adamson 12002d1426cSWeston Andros Adamson /* Linearly search the commit list for the correct request */ 12102d1426cSWeston Andros Adamson list_for_each_entry_safe(freq, t, &cinfo.mds->list, wb_list) { 12202d1426cSWeston Andros Adamson if (freq->wb_page == page) 12302d1426cSWeston Andros Adamson return freq->wb_head; 12402d1426cSWeston Andros Adamson } 12502d1426cSWeston Andros Adamson 12602d1426cSWeston Andros Adamson return NULL; 12702d1426cSWeston Andros Adamson } 12802d1426cSWeston Andros Adamson 12902d1426cSWeston Andros Adamson /* 13084d3a9a9SWeston Andros Adamson * nfs_page_find_head_request_locked - find head request associated with @page 13184d3a9a9SWeston Andros Adamson * 13284d3a9a9SWeston Andros Adamson * must be called while holding the inode lock. 13384d3a9a9SWeston Andros Adamson * 13484d3a9a9SWeston Andros Adamson * returns matching head request with reference held, or NULL if not found. 13584d3a9a9SWeston Andros Adamson */ 13629418aa4SMel Gorman static struct nfs_page * 13784d3a9a9SWeston Andros Adamson nfs_page_find_head_request_locked(struct nfs_inode *nfsi, struct page *page) 138277459d2STrond Myklebust { 139277459d2STrond Myklebust struct nfs_page *req = NULL; 140277459d2STrond Myklebust 14129418aa4SMel Gorman if (PagePrivate(page)) 142277459d2STrond Myklebust req = (struct nfs_page *)page_private(page); 14302d1426cSWeston Andros Adamson else if (unlikely(PageSwapCache(page))) 14402d1426cSWeston Andros Adamson req = nfs_page_search_commits_for_head_request_locked(nfsi, 14502d1426cSWeston Andros Adamson page); 14629418aa4SMel Gorman 14784d3a9a9SWeston Andros Adamson if (req) { 14884d3a9a9SWeston Andros Adamson WARN_ON_ONCE(req->wb_head != req); 14929418aa4SMel Gorman kref_get(&req->wb_kref); 15084d3a9a9SWeston Andros Adamson } 15129418aa4SMel Gorman 152277459d2STrond Myklebust return req; 153277459d2STrond Myklebust } 154277459d2STrond Myklebust 15584d3a9a9SWeston Andros Adamson /* 15684d3a9a9SWeston Andros Adamson * nfs_page_find_head_request - find head request associated with @page 15784d3a9a9SWeston Andros Adamson * 15884d3a9a9SWeston Andros Adamson * returns matching head request with reference held, or NULL if not found. 15984d3a9a9SWeston Andros Adamson */ 16084d3a9a9SWeston Andros Adamson static struct nfs_page *nfs_page_find_head_request(struct page *page) 161277459d2STrond Myklebust { 162d56b4ddfSMel Gorman struct inode *inode = page_file_mapping(page)->host; 163277459d2STrond Myklebust struct nfs_page *req = NULL; 164277459d2STrond Myklebust 165587142f8STrond Myklebust spin_lock(&inode->i_lock); 16684d3a9a9SWeston Andros Adamson req = nfs_page_find_head_request_locked(NFS_I(inode), page); 167587142f8STrond Myklebust spin_unlock(&inode->i_lock); 168277459d2STrond Myklebust return req; 169277459d2STrond Myklebust } 170277459d2STrond Myklebust 1711da177e4SLinus Torvalds /* Adjust the file length if we're writing beyond the end */ 1721da177e4SLinus Torvalds static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int count) 1731da177e4SLinus Torvalds { 174d56b4ddfSMel Gorman struct inode *inode = page_file_mapping(page)->host; 175a3d01454STrond Myklebust loff_t end, i_size; 176a3d01454STrond Myklebust pgoff_t end_index; 1771da177e4SLinus Torvalds 178a3d01454STrond Myklebust spin_lock(&inode->i_lock); 179a3d01454STrond Myklebust i_size = i_size_read(inode); 180a3d01454STrond Myklebust end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; 181d56b4ddfSMel Gorman if (i_size > 0 && page_file_index(page) < end_index) 182a3d01454STrond Myklebust goto out; 183d56b4ddfSMel Gorman end = page_file_offset(page) + ((loff_t)offset+count); 1841da177e4SLinus Torvalds if (i_size >= end) 185a3d01454STrond Myklebust goto out; 1861da177e4SLinus Torvalds i_size_write(inode, end); 187a3d01454STrond Myklebust nfs_inc_stats(inode, NFSIOS_EXTENDWRITE); 188a3d01454STrond Myklebust out: 189a3d01454STrond Myklebust spin_unlock(&inode->i_lock); 1901da177e4SLinus Torvalds } 1911da177e4SLinus Torvalds 192a301b777STrond Myklebust /* A writeback failed: mark the page as bad, and invalidate the page cache */ 193a301b777STrond Myklebust static void nfs_set_pageerror(struct page *page) 194a301b777STrond Myklebust { 195d56b4ddfSMel Gorman nfs_zap_mapping(page_file_mapping(page)->host, page_file_mapping(page)); 196a301b777STrond Myklebust } 197a301b777STrond Myklebust 198d72ddcbaSWeston Andros Adamson /* 199d72ddcbaSWeston Andros Adamson * nfs_page_group_search_locked 200d72ddcbaSWeston Andros Adamson * @head - head request of page group 201d72ddcbaSWeston Andros Adamson * @page_offset - offset into page 202d72ddcbaSWeston Andros Adamson * 203d72ddcbaSWeston Andros Adamson * Search page group with head @head to find a request that contains the 204d72ddcbaSWeston Andros Adamson * page offset @page_offset. 205d72ddcbaSWeston Andros Adamson * 206d72ddcbaSWeston Andros Adamson * Returns a pointer to the first matching nfs request, or NULL if no 207d72ddcbaSWeston Andros Adamson * match is found. 208d72ddcbaSWeston Andros Adamson * 209d72ddcbaSWeston Andros Adamson * Must be called with the page group lock held 210d72ddcbaSWeston Andros Adamson */ 211d72ddcbaSWeston Andros Adamson static struct nfs_page * 212d72ddcbaSWeston Andros Adamson nfs_page_group_search_locked(struct nfs_page *head, unsigned int page_offset) 213d72ddcbaSWeston Andros Adamson { 214d72ddcbaSWeston Andros Adamson struct nfs_page *req; 215d72ddcbaSWeston Andros Adamson 216d72ddcbaSWeston Andros Adamson WARN_ON_ONCE(head != head->wb_head); 217d72ddcbaSWeston Andros Adamson WARN_ON_ONCE(!test_bit(PG_HEADLOCK, &head->wb_head->wb_flags)); 218d72ddcbaSWeston Andros Adamson 219d72ddcbaSWeston Andros Adamson req = head; 220d72ddcbaSWeston Andros Adamson do { 221d72ddcbaSWeston Andros Adamson if (page_offset >= req->wb_pgbase && 222d72ddcbaSWeston Andros Adamson page_offset < (req->wb_pgbase + req->wb_bytes)) 223d72ddcbaSWeston Andros Adamson return req; 224d72ddcbaSWeston Andros Adamson 225d72ddcbaSWeston Andros Adamson req = req->wb_this_page; 226d72ddcbaSWeston Andros Adamson } while (req != head); 227d72ddcbaSWeston Andros Adamson 228d72ddcbaSWeston Andros Adamson return NULL; 229d72ddcbaSWeston Andros Adamson } 230d72ddcbaSWeston Andros Adamson 231d72ddcbaSWeston Andros Adamson /* 232d72ddcbaSWeston Andros Adamson * nfs_page_group_covers_page 233d72ddcbaSWeston Andros Adamson * @head - head request of page group 234d72ddcbaSWeston Andros Adamson * 235d72ddcbaSWeston Andros Adamson * Return true if the page group with head @head covers the whole page, 236d72ddcbaSWeston Andros Adamson * returns false otherwise 237d72ddcbaSWeston Andros Adamson */ 238d72ddcbaSWeston Andros Adamson static bool nfs_page_group_covers_page(struct nfs_page *req) 239d72ddcbaSWeston Andros Adamson { 240d72ddcbaSWeston Andros Adamson struct nfs_page *tmp; 241d72ddcbaSWeston Andros Adamson unsigned int pos = 0; 242d72ddcbaSWeston Andros Adamson unsigned int len = nfs_page_length(req->wb_page); 243d72ddcbaSWeston Andros Adamson 244*fd2f3a06SWeston Andros Adamson nfs_page_group_lock(req, false); 245d72ddcbaSWeston Andros Adamson 246d72ddcbaSWeston Andros Adamson do { 247d72ddcbaSWeston Andros Adamson tmp = nfs_page_group_search_locked(req->wb_head, pos); 248d72ddcbaSWeston Andros Adamson if (tmp) { 249d72ddcbaSWeston Andros Adamson /* no way this should happen */ 250d72ddcbaSWeston Andros Adamson WARN_ON_ONCE(tmp->wb_pgbase != pos); 251d72ddcbaSWeston Andros Adamson pos += tmp->wb_bytes - (pos - tmp->wb_pgbase); 252d72ddcbaSWeston Andros Adamson } 253d72ddcbaSWeston Andros Adamson } while (tmp && pos < len); 254d72ddcbaSWeston Andros Adamson 255d72ddcbaSWeston Andros Adamson nfs_page_group_unlock(req); 256d72ddcbaSWeston Andros Adamson WARN_ON_ONCE(pos > len); 257d72ddcbaSWeston Andros Adamson return pos == len; 258d72ddcbaSWeston Andros Adamson } 259d72ddcbaSWeston Andros Adamson 2601da177e4SLinus Torvalds /* We can set the PG_uptodate flag if we see that a write request 2611da177e4SLinus Torvalds * covers the full page. 2621da177e4SLinus Torvalds */ 263d72ddcbaSWeston Andros Adamson static void nfs_mark_uptodate(struct nfs_page *req) 2641da177e4SLinus Torvalds { 265d72ddcbaSWeston Andros Adamson if (PageUptodate(req->wb_page)) 2661da177e4SLinus Torvalds return; 267d72ddcbaSWeston Andros Adamson if (!nfs_page_group_covers_page(req)) 2681da177e4SLinus Torvalds return; 269d72ddcbaSWeston Andros Adamson SetPageUptodate(req->wb_page); 2701da177e4SLinus Torvalds } 2711da177e4SLinus Torvalds 2721da177e4SLinus Torvalds static int wb_priority(struct writeback_control *wbc) 2731da177e4SLinus Torvalds { 2741da177e4SLinus Torvalds if (wbc->for_reclaim) 275c63c7b05STrond Myklebust return FLUSH_HIGHPRI | FLUSH_STABLE; 276b17621feSWu Fengguang if (wbc->for_kupdate || wbc->for_background) 277b31268acSTrond Myklebust return FLUSH_LOWPRI | FLUSH_COND_STABLE; 278b31268acSTrond Myklebust return FLUSH_COND_STABLE; 2791da177e4SLinus Torvalds } 2801da177e4SLinus Torvalds 2811da177e4SLinus Torvalds /* 28289a09141SPeter Zijlstra * NFS congestion control 28389a09141SPeter Zijlstra */ 28489a09141SPeter Zijlstra 28589a09141SPeter Zijlstra int nfs_congestion_kb; 28689a09141SPeter Zijlstra 28789a09141SPeter Zijlstra #define NFS_CONGESTION_ON_THRESH (nfs_congestion_kb >> (PAGE_SHIFT-10)) 28889a09141SPeter Zijlstra #define NFS_CONGESTION_OFF_THRESH \ 28989a09141SPeter Zijlstra (NFS_CONGESTION_ON_THRESH - (NFS_CONGESTION_ON_THRESH >> 2)) 29089a09141SPeter Zijlstra 291deed85e7STrond Myklebust static void nfs_set_page_writeback(struct page *page) 29289a09141SPeter Zijlstra { 293deed85e7STrond Myklebust struct nfs_server *nfss = NFS_SERVER(page_file_mapping(page)->host); 2945a6d41b3STrond Myklebust int ret = test_set_page_writeback(page); 2955a6d41b3STrond Myklebust 296deed85e7STrond Myklebust WARN_ON_ONCE(ret != 0); 29789a09141SPeter Zijlstra 298277866a0SPeter Zijlstra if (atomic_long_inc_return(&nfss->writeback) > 2998aa7e847SJens Axboe NFS_CONGESTION_ON_THRESH) { 3008aa7e847SJens Axboe set_bdi_congested(&nfss->backing_dev_info, 3018aa7e847SJens Axboe BLK_RW_ASYNC); 3028aa7e847SJens Axboe } 30389a09141SPeter Zijlstra } 30489a09141SPeter Zijlstra 30520633f04SWeston Andros Adamson static void nfs_end_page_writeback(struct nfs_page *req) 30689a09141SPeter Zijlstra { 30720633f04SWeston Andros Adamson struct inode *inode = page_file_mapping(req->wb_page)->host; 30889a09141SPeter Zijlstra struct nfs_server *nfss = NFS_SERVER(inode); 30989a09141SPeter Zijlstra 31020633f04SWeston Andros Adamson if (!nfs_page_group_sync_on_bit(req, PG_WB_END)) 31120633f04SWeston Andros Adamson return; 31220633f04SWeston Andros Adamson 31320633f04SWeston Andros Adamson end_page_writeback(req->wb_page); 314c4dc4beeSPeter Zijlstra if (atomic_long_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH) 3158aa7e847SJens Axboe clear_bdi_congested(&nfss->backing_dev_info, BLK_RW_ASYNC); 31689a09141SPeter Zijlstra } 31789a09141SPeter Zijlstra 318d4581383SWeston Andros Adamson 319d4581383SWeston Andros Adamson /* nfs_page_group_clear_bits 320d4581383SWeston Andros Adamson * @req - an nfs request 321d4581383SWeston Andros Adamson * clears all page group related bits from @req 322d4581383SWeston Andros Adamson */ 323d4581383SWeston Andros Adamson static void 324d4581383SWeston Andros Adamson nfs_page_group_clear_bits(struct nfs_page *req) 325e261f51fSTrond Myklebust { 326d4581383SWeston Andros Adamson clear_bit(PG_TEARDOWN, &req->wb_flags); 327d4581383SWeston Andros Adamson clear_bit(PG_UNLOCKPAGE, &req->wb_flags); 328d4581383SWeston Andros Adamson clear_bit(PG_UPTODATE, &req->wb_flags); 329d4581383SWeston Andros Adamson clear_bit(PG_WB_END, &req->wb_flags); 330d4581383SWeston Andros Adamson clear_bit(PG_REMOVE, &req->wb_flags); 331d4581383SWeston Andros Adamson } 332d4581383SWeston Andros Adamson 333d4581383SWeston Andros Adamson 334d4581383SWeston Andros Adamson /* 335d4581383SWeston Andros Adamson * nfs_unroll_locks_and_wait - unlock all newly locked reqs and wait on @req 336d4581383SWeston Andros Adamson * 337d4581383SWeston Andros Adamson * this is a helper function for nfs_lock_and_join_requests 338d4581383SWeston Andros Adamson * 339d4581383SWeston Andros Adamson * @inode - inode associated with request page group, must be holding inode lock 340d4581383SWeston Andros Adamson * @head - head request of page group, must be holding head lock 341d4581383SWeston Andros Adamson * @req - request that couldn't lock and needs to wait on the req bit lock 342d4581383SWeston Andros Adamson * @nonblock - if true, don't actually wait 343d4581383SWeston Andros Adamson * 344d4581383SWeston Andros Adamson * NOTE: this must be called holding page_group bit lock and inode spin lock 345d4581383SWeston Andros Adamson * and BOTH will be released before returning. 346d4581383SWeston Andros Adamson * 347d4581383SWeston Andros Adamson * returns 0 on success, < 0 on error. 348d4581383SWeston Andros Adamson */ 349d4581383SWeston Andros Adamson static int 350d4581383SWeston Andros Adamson nfs_unroll_locks_and_wait(struct inode *inode, struct nfs_page *head, 351d4581383SWeston Andros Adamson struct nfs_page *req, bool nonblock) 352d4581383SWeston Andros Adamson __releases(&inode->i_lock) 353d4581383SWeston Andros Adamson { 354d4581383SWeston Andros Adamson struct nfs_page *tmp; 355e261f51fSTrond Myklebust int ret; 356e261f51fSTrond Myklebust 357d4581383SWeston Andros Adamson /* relinquish all the locks successfully grabbed this run */ 358d4581383SWeston Andros Adamson for (tmp = head ; tmp != req; tmp = tmp->wb_this_page) 359d4581383SWeston Andros Adamson nfs_unlock_request(tmp); 360d4581383SWeston Andros Adamson 361d4581383SWeston Andros Adamson WARN_ON_ONCE(test_bit(PG_TEARDOWN, &req->wb_flags)); 362d4581383SWeston Andros Adamson 363d4581383SWeston Andros Adamson /* grab a ref on the request that will be waited on */ 364d4581383SWeston Andros Adamson kref_get(&req->wb_kref); 365d4581383SWeston Andros Adamson 366d4581383SWeston Andros Adamson nfs_page_group_unlock(head); 367587142f8STrond Myklebust spin_unlock(&inode->i_lock); 368d4581383SWeston Andros Adamson 369d4581383SWeston Andros Adamson /* release ref from nfs_page_find_head_request_locked */ 370d4581383SWeston Andros Adamson nfs_release_request(head); 371d4581383SWeston Andros Adamson 372cfb506e1STrond Myklebust if (!nonblock) 373e261f51fSTrond Myklebust ret = nfs_wait_on_request(req); 374cfb506e1STrond Myklebust else 375cfb506e1STrond Myklebust ret = -EAGAIN; 376e261f51fSTrond Myklebust nfs_release_request(req); 377d4581383SWeston Andros Adamson 378d4581383SWeston Andros Adamson return ret; 379e261f51fSTrond Myklebust } 380d4581383SWeston Andros Adamson 381d4581383SWeston Andros Adamson /* 382d4581383SWeston Andros Adamson * nfs_destroy_unlinked_subrequests - destroy recently unlinked subrequests 383d4581383SWeston Andros Adamson * 384d4581383SWeston Andros Adamson * @destroy_list - request list (using wb_this_page) terminated by @old_head 385d4581383SWeston Andros Adamson * @old_head - the old head of the list 386d4581383SWeston Andros Adamson * 387d4581383SWeston Andros Adamson * All subrequests must be locked and removed from all lists, so at this point 388d4581383SWeston Andros Adamson * they are only "active" in this function, and possibly in nfs_wait_on_request 389d4581383SWeston Andros Adamson * with a reference held by some other context. 390d4581383SWeston Andros Adamson */ 391d4581383SWeston Andros Adamson static void 392d4581383SWeston Andros Adamson nfs_destroy_unlinked_subrequests(struct nfs_page *destroy_list, 393d4581383SWeston Andros Adamson struct nfs_page *old_head) 394d4581383SWeston Andros Adamson { 395d4581383SWeston Andros Adamson while (destroy_list) { 396d4581383SWeston Andros Adamson struct nfs_page *subreq = destroy_list; 397d4581383SWeston Andros Adamson 398d4581383SWeston Andros Adamson destroy_list = (subreq->wb_this_page == old_head) ? 399d4581383SWeston Andros Adamson NULL : subreq->wb_this_page; 400d4581383SWeston Andros Adamson 401d4581383SWeston Andros Adamson WARN_ON_ONCE(old_head != subreq->wb_head); 402d4581383SWeston Andros Adamson 403d4581383SWeston Andros Adamson /* make sure old group is not used */ 404d4581383SWeston Andros Adamson subreq->wb_head = subreq; 405d4581383SWeston Andros Adamson subreq->wb_this_page = subreq; 406d4581383SWeston Andros Adamson 407d4581383SWeston Andros Adamson /* subreq is now totally disconnected from page group or any 408d4581383SWeston Andros Adamson * write / commit lists. last chance to wake any waiters */ 409d4581383SWeston Andros Adamson nfs_unlock_request(subreq); 410d4581383SWeston Andros Adamson 411d4581383SWeston Andros Adamson if (!test_bit(PG_TEARDOWN, &subreq->wb_flags)) { 412d4581383SWeston Andros Adamson /* release ref on old head request */ 413d4581383SWeston Andros Adamson nfs_release_request(old_head); 414d4581383SWeston Andros Adamson 415d4581383SWeston Andros Adamson nfs_page_group_clear_bits(subreq); 416d4581383SWeston Andros Adamson 417d4581383SWeston Andros Adamson /* release the PG_INODE_REF reference */ 418d4581383SWeston Andros Adamson if (test_and_clear_bit(PG_INODE_REF, &subreq->wb_flags)) 419d4581383SWeston Andros Adamson nfs_release_request(subreq); 420d4581383SWeston Andros Adamson else 421d4581383SWeston Andros Adamson WARN_ON_ONCE(1); 422d4581383SWeston Andros Adamson } else { 423d4581383SWeston Andros Adamson WARN_ON_ONCE(test_bit(PG_CLEAN, &subreq->wb_flags)); 424d4581383SWeston Andros Adamson /* zombie requests have already released the last 425d4581383SWeston Andros Adamson * reference and were waiting on the rest of the 426d4581383SWeston Andros Adamson * group to complete. Since it's no longer part of a 427d4581383SWeston Andros Adamson * group, simply free the request */ 428d4581383SWeston Andros Adamson nfs_page_group_clear_bits(subreq); 429d4581383SWeston Andros Adamson nfs_free_request(subreq); 430d4581383SWeston Andros Adamson } 431d4581383SWeston Andros Adamson } 432d4581383SWeston Andros Adamson } 433d4581383SWeston Andros Adamson 434d4581383SWeston Andros Adamson /* 435d4581383SWeston Andros Adamson * nfs_lock_and_join_requests - join all subreqs to the head req and return 436d4581383SWeston Andros Adamson * a locked reference, cancelling any pending 437d4581383SWeston Andros Adamson * operations for this page. 438d4581383SWeston Andros Adamson * 439d4581383SWeston Andros Adamson * @page - the page used to lookup the "page group" of nfs_page structures 440d4581383SWeston Andros Adamson * @nonblock - if true, don't block waiting for request locks 441d4581383SWeston Andros Adamson * 442d4581383SWeston Andros Adamson * This function joins all sub requests to the head request by first 443d4581383SWeston Andros Adamson * locking all requests in the group, cancelling any pending operations 444d4581383SWeston Andros Adamson * and finally updating the head request to cover the whole range covered by 445d4581383SWeston Andros Adamson * the (former) group. All subrequests are removed from any write or commit 446d4581383SWeston Andros Adamson * lists, unlinked from the group and destroyed. 447d4581383SWeston Andros Adamson * 448d4581383SWeston Andros Adamson * Returns a locked, referenced pointer to the head request - which after 449d4581383SWeston Andros Adamson * this call is guaranteed to be the only request associated with the page. 450d4581383SWeston Andros Adamson * Returns NULL if no requests are found for @page, or a ERR_PTR if an 451d4581383SWeston Andros Adamson * error was encountered. 452d4581383SWeston Andros Adamson */ 453d4581383SWeston Andros Adamson static struct nfs_page * 454d4581383SWeston Andros Adamson nfs_lock_and_join_requests(struct page *page, bool nonblock) 455d4581383SWeston Andros Adamson { 456d4581383SWeston Andros Adamson struct inode *inode = page_file_mapping(page)->host; 457d4581383SWeston Andros Adamson struct nfs_page *head, *subreq; 458d4581383SWeston Andros Adamson struct nfs_page *destroy_list = NULL; 459d4581383SWeston Andros Adamson unsigned int total_bytes; 460d4581383SWeston Andros Adamson int ret; 461d4581383SWeston Andros Adamson 462d4581383SWeston Andros Adamson try_again: 463d4581383SWeston Andros Adamson total_bytes = 0; 464d4581383SWeston Andros Adamson 465d4581383SWeston Andros Adamson WARN_ON_ONCE(destroy_list); 466d4581383SWeston Andros Adamson 467d4581383SWeston Andros Adamson spin_lock(&inode->i_lock); 468d4581383SWeston Andros Adamson 469d4581383SWeston Andros Adamson /* 470d4581383SWeston Andros Adamson * A reference is taken only on the head request which acts as a 471d4581383SWeston Andros Adamson * reference to the whole page group - the group will not be destroyed 472d4581383SWeston Andros Adamson * until the head reference is released. 473d4581383SWeston Andros Adamson */ 474d4581383SWeston Andros Adamson head = nfs_page_find_head_request_locked(NFS_I(inode), page); 475d4581383SWeston Andros Adamson 476d4581383SWeston Andros Adamson if (!head) { 477587142f8STrond Myklebust spin_unlock(&inode->i_lock); 478d4581383SWeston Andros Adamson return NULL; 479d4581383SWeston Andros Adamson } 480d4581383SWeston Andros Adamson 481d4581383SWeston Andros Adamson /* lock each request in the page group */ 482*fd2f3a06SWeston Andros Adamson ret = nfs_page_group_lock(head, true); 483e7029206SWeston Andros Adamson if (ret < 0) 484e7029206SWeston Andros Adamson return ERR_PTR(ret); 485d4581383SWeston Andros Adamson subreq = head; 486d4581383SWeston Andros Adamson do { 487d4581383SWeston Andros Adamson /* 488d4581383SWeston Andros Adamson * Subrequests are always contiguous, non overlapping 489d4581383SWeston Andros Adamson * and in order. If not, it's a programming error. 490d4581383SWeston Andros Adamson */ 491d4581383SWeston Andros Adamson WARN_ON_ONCE(subreq->wb_offset != 492d4581383SWeston Andros Adamson (head->wb_offset + total_bytes)); 493d4581383SWeston Andros Adamson 494d4581383SWeston Andros Adamson /* keep track of how many bytes this group covers */ 495d4581383SWeston Andros Adamson total_bytes += subreq->wb_bytes; 496d4581383SWeston Andros Adamson 497d4581383SWeston Andros Adamson if (!nfs_lock_request(subreq)) { 498d4581383SWeston Andros Adamson /* releases page group bit lock and 499d4581383SWeston Andros Adamson * inode spin lock and all references */ 500d4581383SWeston Andros Adamson ret = nfs_unroll_locks_and_wait(inode, head, 501d4581383SWeston Andros Adamson subreq, nonblock); 502d4581383SWeston Andros Adamson 503d4581383SWeston Andros Adamson if (ret == 0) 504d4581383SWeston Andros Adamson goto try_again; 505d4581383SWeston Andros Adamson 506d4581383SWeston Andros Adamson return ERR_PTR(ret); 507d4581383SWeston Andros Adamson } 508d4581383SWeston Andros Adamson 509d4581383SWeston Andros Adamson subreq = subreq->wb_this_page; 510d4581383SWeston Andros Adamson } while (subreq != head); 511d4581383SWeston Andros Adamson 512d4581383SWeston Andros Adamson /* Now that all requests are locked, make sure they aren't on any list. 513d4581383SWeston Andros Adamson * Commit list removal accounting is done after locks are dropped */ 514d4581383SWeston Andros Adamson subreq = head; 515d4581383SWeston Andros Adamson do { 516411a99adSWeston Andros Adamson nfs_clear_request_commit(subreq); 517d4581383SWeston Andros Adamson subreq = subreq->wb_this_page; 518d4581383SWeston Andros Adamson } while (subreq != head); 519d4581383SWeston Andros Adamson 520d4581383SWeston Andros Adamson /* unlink subrequests from head, destroy them later */ 521d4581383SWeston Andros Adamson if (head->wb_this_page != head) { 522d4581383SWeston Andros Adamson /* destroy list will be terminated by head */ 523d4581383SWeston Andros Adamson destroy_list = head->wb_this_page; 524d4581383SWeston Andros Adamson head->wb_this_page = head; 525d4581383SWeston Andros Adamson 526d4581383SWeston Andros Adamson /* change head request to cover whole range that 527d4581383SWeston Andros Adamson * the former page group covered */ 528d4581383SWeston Andros Adamson head->wb_bytes = total_bytes; 529d4581383SWeston Andros Adamson } 530d4581383SWeston Andros Adamson 531d4581383SWeston Andros Adamson /* 532d4581383SWeston Andros Adamson * prepare head request to be added to new pgio descriptor 533d4581383SWeston Andros Adamson */ 534d4581383SWeston Andros Adamson nfs_page_group_clear_bits(head); 535d4581383SWeston Andros Adamson 536d4581383SWeston Andros Adamson /* 537d4581383SWeston Andros Adamson * some part of the group was still on the inode list - otherwise 538d4581383SWeston Andros Adamson * the group wouldn't be involved in async write. 539d4581383SWeston Andros Adamson * grab a reference for the head request, iff it needs one. 540d4581383SWeston Andros Adamson */ 541d4581383SWeston Andros Adamson if (!test_and_set_bit(PG_INODE_REF, &head->wb_flags)) 542d4581383SWeston Andros Adamson kref_get(&head->wb_kref); 543d4581383SWeston Andros Adamson 544d4581383SWeston Andros Adamson nfs_page_group_unlock(head); 545d4581383SWeston Andros Adamson 546411a99adSWeston Andros Adamson /* drop lock to clean uprequests on destroy list */ 547d4581383SWeston Andros Adamson spin_unlock(&inode->i_lock); 548d4581383SWeston Andros Adamson 549d4581383SWeston Andros Adamson nfs_destroy_unlinked_subrequests(destroy_list, head); 550d4581383SWeston Andros Adamson 551d4581383SWeston Andros Adamson /* still holds ref on head from nfs_page_find_head_request_locked 552d4581383SWeston Andros Adamson * and still has lock on head from lock loop */ 553d4581383SWeston Andros Adamson return head; 554612c9384STrond Myklebust } 555074cc1deSTrond Myklebust 556074cc1deSTrond Myklebust /* 557074cc1deSTrond Myklebust * Find an associated nfs write request, and prepare to flush it out 558074cc1deSTrond Myklebust * May return an error if the user signalled nfs_wait_on_request(). 559074cc1deSTrond Myklebust */ 560074cc1deSTrond Myklebust static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio, 561cfb506e1STrond Myklebust struct page *page, bool nonblock) 562074cc1deSTrond Myklebust { 563074cc1deSTrond Myklebust struct nfs_page *req; 564074cc1deSTrond Myklebust int ret = 0; 565074cc1deSTrond Myklebust 566d4581383SWeston Andros Adamson req = nfs_lock_and_join_requests(page, nonblock); 567074cc1deSTrond Myklebust if (!req) 568074cc1deSTrond Myklebust goto out; 569074cc1deSTrond Myklebust ret = PTR_ERR(req); 570074cc1deSTrond Myklebust if (IS_ERR(req)) 571074cc1deSTrond Myklebust goto out; 572074cc1deSTrond Myklebust 573deed85e7STrond Myklebust nfs_set_page_writeback(page); 574deed85e7STrond Myklebust WARN_ON_ONCE(test_bit(PG_CLEAN, &req->wb_flags)); 575074cc1deSTrond Myklebust 576deed85e7STrond Myklebust ret = 0; 577f8512ad0SFred Isaman if (!nfs_pageio_add_request(pgio, req)) { 578f8512ad0SFred Isaman nfs_redirty_request(req); 579074cc1deSTrond Myklebust ret = pgio->pg_error; 580f8512ad0SFred Isaman } 581074cc1deSTrond Myklebust out: 582074cc1deSTrond Myklebust return ret; 583e261f51fSTrond Myklebust } 584e261f51fSTrond Myklebust 585f758c885STrond Myklebust static int nfs_do_writepage(struct page *page, struct writeback_control *wbc, struct nfs_pageio_descriptor *pgio) 586f758c885STrond Myklebust { 587d56b4ddfSMel Gorman struct inode *inode = page_file_mapping(page)->host; 588cfb506e1STrond Myklebust int ret; 589f758c885STrond Myklebust 590f758c885STrond Myklebust nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE); 591f758c885STrond Myklebust nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1); 592f758c885STrond Myklebust 593d56b4ddfSMel Gorman nfs_pageio_cond_complete(pgio, page_file_index(page)); 5941b430beeSWu Fengguang ret = nfs_page_async_flush(pgio, page, wbc->sync_mode == WB_SYNC_NONE); 595cfb506e1STrond Myklebust if (ret == -EAGAIN) { 596cfb506e1STrond Myklebust redirty_page_for_writepage(wbc, page); 597cfb506e1STrond Myklebust ret = 0; 598cfb506e1STrond Myklebust } 599cfb506e1STrond Myklebust return ret; 600f758c885STrond Myklebust } 601f758c885STrond Myklebust 602e261f51fSTrond Myklebust /* 6031da177e4SLinus Torvalds * Write an mmapped page to the server. 6041da177e4SLinus Torvalds */ 6054d770ccfSTrond Myklebust static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc) 6061da177e4SLinus Torvalds { 607f758c885STrond Myklebust struct nfs_pageio_descriptor pgio; 608e261f51fSTrond Myklebust int err; 6091da177e4SLinus Torvalds 610a20c93e3SChristoph Hellwig nfs_pageio_init_write(&pgio, page->mapping->host, wb_priority(wbc), 611a20c93e3SChristoph Hellwig false, &nfs_async_write_completion_ops); 612f758c885STrond Myklebust err = nfs_do_writepage(page, wbc, &pgio); 613f758c885STrond Myklebust nfs_pageio_complete(&pgio); 614f758c885STrond Myklebust if (err < 0) 6154d770ccfSTrond Myklebust return err; 616f758c885STrond Myklebust if (pgio.pg_error < 0) 617f758c885STrond Myklebust return pgio.pg_error; 618f758c885STrond Myklebust return 0; 6194d770ccfSTrond Myklebust } 6204d770ccfSTrond Myklebust 6214d770ccfSTrond Myklebust int nfs_writepage(struct page *page, struct writeback_control *wbc) 6224d770ccfSTrond Myklebust { 623f758c885STrond Myklebust int ret; 6244d770ccfSTrond Myklebust 625f758c885STrond Myklebust ret = nfs_writepage_locked(page, wbc); 6261da177e4SLinus Torvalds unlock_page(page); 627f758c885STrond Myklebust return ret; 628f758c885STrond Myklebust } 629f758c885STrond Myklebust 630f758c885STrond Myklebust static int nfs_writepages_callback(struct page *page, struct writeback_control *wbc, void *data) 631f758c885STrond Myklebust { 632f758c885STrond Myklebust int ret; 633f758c885STrond Myklebust 634f758c885STrond Myklebust ret = nfs_do_writepage(page, wbc, data); 635f758c885STrond Myklebust unlock_page(page); 636f758c885STrond Myklebust return ret; 6371da177e4SLinus Torvalds } 6381da177e4SLinus Torvalds 6391da177e4SLinus Torvalds int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc) 6401da177e4SLinus Torvalds { 6411da177e4SLinus Torvalds struct inode *inode = mapping->host; 64272cb77f4STrond Myklebust unsigned long *bitlock = &NFS_I(inode)->flags; 643c63c7b05STrond Myklebust struct nfs_pageio_descriptor pgio; 6441da177e4SLinus Torvalds int err; 6451da177e4SLinus Torvalds 64672cb77f4STrond Myklebust /* Stop dirtying of new pages while we sync */ 64774316201SNeilBrown err = wait_on_bit_lock_action(bitlock, NFS_INO_FLUSHING, 64872cb77f4STrond Myklebust nfs_wait_bit_killable, TASK_KILLABLE); 64972cb77f4STrond Myklebust if (err) 65072cb77f4STrond Myklebust goto out_err; 65172cb77f4STrond Myklebust 65291d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES); 65391d5b470SChuck Lever 654a20c93e3SChristoph Hellwig nfs_pageio_init_write(&pgio, inode, wb_priority(wbc), false, 655a20c93e3SChristoph Hellwig &nfs_async_write_completion_ops); 656f758c885STrond Myklebust err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio); 657c63c7b05STrond Myklebust nfs_pageio_complete(&pgio); 65872cb77f4STrond Myklebust 65972cb77f4STrond Myklebust clear_bit_unlock(NFS_INO_FLUSHING, bitlock); 6604e857c58SPeter Zijlstra smp_mb__after_atomic(); 66172cb77f4STrond Myklebust wake_up_bit(bitlock, NFS_INO_FLUSHING); 66272cb77f4STrond Myklebust 663f758c885STrond Myklebust if (err < 0) 66472cb77f4STrond Myklebust goto out_err; 66572cb77f4STrond Myklebust err = pgio.pg_error; 66672cb77f4STrond Myklebust if (err < 0) 66772cb77f4STrond Myklebust goto out_err; 668c63c7b05STrond Myklebust return 0; 66972cb77f4STrond Myklebust out_err: 67072cb77f4STrond Myklebust return err; 6711da177e4SLinus Torvalds } 6721da177e4SLinus Torvalds 6731da177e4SLinus Torvalds /* 6741da177e4SLinus Torvalds * Insert a write request into an inode 6751da177e4SLinus Torvalds */ 676d6d6dc7cSFred Isaman static void nfs_inode_add_request(struct inode *inode, struct nfs_page *req) 6771da177e4SLinus Torvalds { 6781da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 679e7d39069STrond Myklebust 6802bfc6e56SWeston Andros Adamson WARN_ON_ONCE(req->wb_this_page != req); 6812bfc6e56SWeston Andros Adamson 682e7d39069STrond Myklebust /* Lock the request! */ 6837ad84aa9STrond Myklebust nfs_lock_request(req); 684e7d39069STrond Myklebust 685e7d39069STrond Myklebust spin_lock(&inode->i_lock); 686011e2a7fSBryan Schumaker if (!nfsi->npages && NFS_PROTO(inode)->have_delegation(inode, FMODE_WRITE)) 687a9a4a87aSTrond Myklebust inode->i_version++; 68829418aa4SMel Gorman /* 68929418aa4SMel Gorman * Swap-space should not get truncated. Hence no need to plug the race 69029418aa4SMel Gorman * with invalidate/truncate. 69129418aa4SMel Gorman */ 69229418aa4SMel Gorman if (likely(!PageSwapCache(req->wb_page))) { 6932df485a7STrond Myklebust set_bit(PG_MAPPED, &req->wb_flags); 694deb7d638STrond Myklebust SetPagePrivate(req->wb_page); 695277459d2STrond Myklebust set_page_private(req->wb_page, (unsigned long)req); 69629418aa4SMel Gorman } 6971da177e4SLinus Torvalds nfsi->npages++; 69817089a29SWeston Andros Adamson /* this a head request for a page group - mark it as having an 69917089a29SWeston Andros Adamson * extra reference so sub groups can follow suit */ 70017089a29SWeston Andros Adamson WARN_ON(test_and_set_bit(PG_INODE_REF, &req->wb_flags)); 701c03b4024STrond Myklebust kref_get(&req->wb_kref); 702e7d39069STrond Myklebust spin_unlock(&inode->i_lock); 7031da177e4SLinus Torvalds } 7041da177e4SLinus Torvalds 7051da177e4SLinus Torvalds /* 70689a09141SPeter Zijlstra * Remove a write request from an inode 7071da177e4SLinus Torvalds */ 7081da177e4SLinus Torvalds static void nfs_inode_remove_request(struct nfs_page *req) 7091da177e4SLinus Torvalds { 7103d4ff43dSAl Viro struct inode *inode = req->wb_context->dentry->d_inode; 7111da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 71220633f04SWeston Andros Adamson struct nfs_page *head; 71320633f04SWeston Andros Adamson 71420633f04SWeston Andros Adamson if (nfs_page_group_sync_on_bit(req, PG_REMOVE)) { 71520633f04SWeston Andros Adamson head = req->wb_head; 7161da177e4SLinus Torvalds 717587142f8STrond Myklebust spin_lock(&inode->i_lock); 71820633f04SWeston Andros Adamson if (likely(!PageSwapCache(head->wb_page))) { 71920633f04SWeston Andros Adamson set_page_private(head->wb_page, 0); 72020633f04SWeston Andros Adamson ClearPagePrivate(head->wb_page); 72120633f04SWeston Andros Adamson clear_bit(PG_MAPPED, &head->wb_flags); 72229418aa4SMel Gorman } 7231da177e4SLinus Torvalds nfsi->npages--; 724587142f8STrond Myklebust spin_unlock(&inode->i_lock); 72520633f04SWeston Andros Adamson } 72617089a29SWeston Andros Adamson 72717089a29SWeston Andros Adamson if (test_and_clear_bit(PG_INODE_REF, &req->wb_flags)) 7281da177e4SLinus Torvalds nfs_release_request(req); 729b412ddf0SWeston Andros Adamson else 730b412ddf0SWeston Andros Adamson WARN_ON_ONCE(1); 7311da177e4SLinus Torvalds } 7321da177e4SLinus Torvalds 73361822ab5STrond Myklebust static void 7346d884e8fSFred nfs_mark_request_dirty(struct nfs_page *req) 73561822ab5STrond Myklebust { 73661822ab5STrond Myklebust __set_page_dirty_nobuffers(req->wb_page); 73761822ab5STrond Myklebust } 73861822ab5STrond Myklebust 73989d77c8fSBryan Schumaker #if IS_ENABLED(CONFIG_NFS_V3) || IS_ENABLED(CONFIG_NFS_V4) 7408dd37758STrond Myklebust /** 7418dd37758STrond Myklebust * nfs_request_add_commit_list - add request to a commit list 7428dd37758STrond Myklebust * @req: pointer to a struct nfs_page 743ea2cf228SFred Isaman * @dst: commit list head 744ea2cf228SFred Isaman * @cinfo: holds list lock and accounting info 7458dd37758STrond Myklebust * 746ea2cf228SFred Isaman * This sets the PG_CLEAN bit, updates the cinfo count of 7478dd37758STrond Myklebust * number of outstanding requests requiring a commit as well as 7488dd37758STrond Myklebust * the MM page stats. 7498dd37758STrond Myklebust * 750ea2cf228SFred Isaman * The caller must _not_ hold the cinfo->lock, but must be 7518dd37758STrond Myklebust * holding the nfs_page lock. 7528dd37758STrond Myklebust */ 7538dd37758STrond Myklebust void 754ea2cf228SFred Isaman nfs_request_add_commit_list(struct nfs_page *req, struct list_head *dst, 755ea2cf228SFred Isaman struct nfs_commit_info *cinfo) 7568dd37758STrond Myklebust { 7578dd37758STrond Myklebust set_bit(PG_CLEAN, &(req)->wb_flags); 758ea2cf228SFred Isaman spin_lock(cinfo->lock); 759ea2cf228SFred Isaman nfs_list_add_request(req, dst); 760ea2cf228SFred Isaman cinfo->mds->ncommit++; 761ea2cf228SFred Isaman spin_unlock(cinfo->lock); 76256f9cd68SFred Isaman if (!cinfo->dreq) { 7638dd37758STrond Myklebust inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); 764d56b4ddfSMel Gorman inc_bdi_stat(page_file_mapping(req->wb_page)->backing_dev_info, 76556f9cd68SFred Isaman BDI_RECLAIMABLE); 76656f9cd68SFred Isaman __mark_inode_dirty(req->wb_context->dentry->d_inode, 76756f9cd68SFred Isaman I_DIRTY_DATASYNC); 76856f9cd68SFred Isaman } 7698dd37758STrond Myklebust } 7708dd37758STrond Myklebust EXPORT_SYMBOL_GPL(nfs_request_add_commit_list); 7718dd37758STrond Myklebust 7728dd37758STrond Myklebust /** 7738dd37758STrond Myklebust * nfs_request_remove_commit_list - Remove request from a commit list 7748dd37758STrond Myklebust * @req: pointer to a nfs_page 775ea2cf228SFred Isaman * @cinfo: holds list lock and accounting info 7768dd37758STrond Myklebust * 777ea2cf228SFred Isaman * This clears the PG_CLEAN bit, and updates the cinfo's count of 7788dd37758STrond Myklebust * number of outstanding requests requiring a commit 7798dd37758STrond Myklebust * It does not update the MM page stats. 7808dd37758STrond Myklebust * 781ea2cf228SFred Isaman * The caller _must_ hold the cinfo->lock and the nfs_page lock. 7828dd37758STrond Myklebust */ 7838dd37758STrond Myklebust void 784ea2cf228SFred Isaman nfs_request_remove_commit_list(struct nfs_page *req, 785ea2cf228SFred Isaman struct nfs_commit_info *cinfo) 7868dd37758STrond Myklebust { 7878dd37758STrond Myklebust if (!test_and_clear_bit(PG_CLEAN, &(req)->wb_flags)) 7888dd37758STrond Myklebust return; 7898dd37758STrond Myklebust nfs_list_remove_request(req); 790ea2cf228SFred Isaman cinfo->mds->ncommit--; 7918dd37758STrond Myklebust } 7928dd37758STrond Myklebust EXPORT_SYMBOL_GPL(nfs_request_remove_commit_list); 7938dd37758STrond Myklebust 794ea2cf228SFred Isaman static void nfs_init_cinfo_from_inode(struct nfs_commit_info *cinfo, 795ea2cf228SFred Isaman struct inode *inode) 796ea2cf228SFred Isaman { 797ea2cf228SFred Isaman cinfo->lock = &inode->i_lock; 798ea2cf228SFred Isaman cinfo->mds = &NFS_I(inode)->commit_info; 799ea2cf228SFred Isaman cinfo->ds = pnfs_get_ds_info(inode); 800b359f9d0SFred Isaman cinfo->dreq = NULL; 801f453a54aSFred Isaman cinfo->completion_ops = &nfs_commit_completion_ops; 802ea2cf228SFred Isaman } 803ea2cf228SFred Isaman 804ea2cf228SFred Isaman void nfs_init_cinfo(struct nfs_commit_info *cinfo, 805ea2cf228SFred Isaman struct inode *inode, 806ea2cf228SFred Isaman struct nfs_direct_req *dreq) 807ea2cf228SFred Isaman { 8081763da12SFred Isaman if (dreq) 8091763da12SFred Isaman nfs_init_cinfo_from_dreq(cinfo, dreq); 8101763da12SFred Isaman else 811ea2cf228SFred Isaman nfs_init_cinfo_from_inode(cinfo, inode); 812ea2cf228SFred Isaman } 813ea2cf228SFred Isaman EXPORT_SYMBOL_GPL(nfs_init_cinfo); 8148dd37758STrond Myklebust 8151da177e4SLinus Torvalds /* 8161da177e4SLinus Torvalds * Add a request to the inode's commit list. 8171da177e4SLinus Torvalds */ 8181763da12SFred Isaman void 819ea2cf228SFred Isaman nfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg, 820ea2cf228SFred Isaman struct nfs_commit_info *cinfo) 8211da177e4SLinus Torvalds { 822ea2cf228SFred Isaman if (pnfs_mark_request_commit(req, lseg, cinfo)) 8238dd37758STrond Myklebust return; 824ea2cf228SFred Isaman nfs_request_add_commit_list(req, &cinfo->mds->list, cinfo); 8251da177e4SLinus Torvalds } 8268e821cadSTrond Myklebust 827d6d6dc7cSFred Isaman static void 828d6d6dc7cSFred Isaman nfs_clear_page_commit(struct page *page) 829e468bae9STrond Myklebust { 830e468bae9STrond Myklebust dec_zone_page_state(page, NR_UNSTABLE_NFS); 831d56b4ddfSMel Gorman dec_bdi_stat(page_file_mapping(page)->backing_dev_info, BDI_RECLAIMABLE); 832e468bae9STrond Myklebust } 833d6d6dc7cSFred Isaman 834411a99adSWeston Andros Adamson /* Called holding inode (/cinfo) lock */ 8358dd37758STrond Myklebust static void 836d6d6dc7cSFred Isaman nfs_clear_request_commit(struct nfs_page *req) 837d6d6dc7cSFred Isaman { 8388dd37758STrond Myklebust if (test_bit(PG_CLEAN, &req->wb_flags)) { 8398dd37758STrond Myklebust struct inode *inode = req->wb_context->dentry->d_inode; 840ea2cf228SFred Isaman struct nfs_commit_info cinfo; 841d6d6dc7cSFred Isaman 842ea2cf228SFred Isaman nfs_init_cinfo_from_inode(&cinfo, inode); 843ea2cf228SFred Isaman if (!pnfs_clear_request_commit(req, &cinfo)) { 844ea2cf228SFred Isaman nfs_request_remove_commit_list(req, &cinfo); 845d6d6dc7cSFred Isaman } 8468dd37758STrond Myklebust nfs_clear_page_commit(req->wb_page); 8478dd37758STrond Myklebust } 848e468bae9STrond Myklebust } 849e468bae9STrond Myklebust 850d45f60c6SWeston Andros Adamson int nfs_write_need_commit(struct nfs_pgio_header *hdr) 8518e821cadSTrond Myklebust { 852c65e6254SWeston Andros Adamson if (hdr->verf.committed == NFS_DATA_SYNC) 853d45f60c6SWeston Andros Adamson return hdr->lseg == NULL; 854c65e6254SWeston Andros Adamson return hdr->verf.committed != NFS_FILE_SYNC; 8558e821cadSTrond Myklebust } 8568e821cadSTrond Myklebust 8578e821cadSTrond Myklebust #else 85868cd6fa4SBryan Schumaker static void nfs_init_cinfo_from_inode(struct nfs_commit_info *cinfo, 85968cd6fa4SBryan Schumaker struct inode *inode) 86068cd6fa4SBryan Schumaker { 86168cd6fa4SBryan Schumaker } 86268cd6fa4SBryan Schumaker 86368cd6fa4SBryan Schumaker void nfs_init_cinfo(struct nfs_commit_info *cinfo, 86468cd6fa4SBryan Schumaker struct inode *inode, 86568cd6fa4SBryan Schumaker struct nfs_direct_req *dreq) 86668cd6fa4SBryan Schumaker { 86768cd6fa4SBryan Schumaker } 86868cd6fa4SBryan Schumaker 8691763da12SFred Isaman void 870ea2cf228SFred Isaman nfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg, 871ea2cf228SFred Isaman struct nfs_commit_info *cinfo) 8728e821cadSTrond Myklebust { 8738e821cadSTrond Myklebust } 8748e821cadSTrond Myklebust 8758dd37758STrond Myklebust static void 876e468bae9STrond Myklebust nfs_clear_request_commit(struct nfs_page *req) 877e468bae9STrond Myklebust { 878e468bae9STrond Myklebust } 879e468bae9STrond Myklebust 880d45f60c6SWeston Andros Adamson int nfs_write_need_commit(struct nfs_pgio_header *hdr) 8818e821cadSTrond Myklebust { 8828e821cadSTrond Myklebust return 0; 8838e821cadSTrond Myklebust } 8848e821cadSTrond Myklebust 8851da177e4SLinus Torvalds #endif 8861da177e4SLinus Torvalds 887061ae2edSFred Isaman static void nfs_write_completion(struct nfs_pgio_header *hdr) 8886c75dc0dSFred Isaman { 889ea2cf228SFred Isaman struct nfs_commit_info cinfo; 8906c75dc0dSFred Isaman unsigned long bytes = 0; 8916c75dc0dSFred Isaman 8926c75dc0dSFred Isaman if (test_bit(NFS_IOHDR_REDO, &hdr->flags)) 8936c75dc0dSFred Isaman goto out; 894ea2cf228SFred Isaman nfs_init_cinfo_from_inode(&cinfo, hdr->inode); 8956c75dc0dSFred Isaman while (!list_empty(&hdr->pages)) { 8966c75dc0dSFred Isaman struct nfs_page *req = nfs_list_entry(hdr->pages.next); 8976c75dc0dSFred Isaman 8986c75dc0dSFred Isaman bytes += req->wb_bytes; 8996c75dc0dSFred Isaman nfs_list_remove_request(req); 9006c75dc0dSFred Isaman if (test_bit(NFS_IOHDR_ERROR, &hdr->flags) && 9016c75dc0dSFred Isaman (hdr->good_bytes < bytes)) { 902d1182b33STrond Myklebust nfs_set_pageerror(req->wb_page); 9036c75dc0dSFred Isaman nfs_context_set_write_error(req->wb_context, hdr->error); 9046c75dc0dSFred Isaman goto remove_req; 9056c75dc0dSFred Isaman } 906c65e6254SWeston Andros Adamson if (nfs_write_need_commit(hdr)) { 907f79d06f5SAnna Schumaker memcpy(&req->wb_verf, &hdr->verf.verifier, sizeof(req->wb_verf)); 908ea2cf228SFred Isaman nfs_mark_request_commit(req, hdr->lseg, &cinfo); 9096c75dc0dSFred Isaman goto next; 9106c75dc0dSFred Isaman } 9116c75dc0dSFred Isaman remove_req: 9126c75dc0dSFred Isaman nfs_inode_remove_request(req); 9136c75dc0dSFred Isaman next: 9141d1afcbcSTrond Myklebust nfs_unlock_request(req); 91520633f04SWeston Andros Adamson nfs_end_page_writeback(req); 9163aff4ebbSTrond Myklebust nfs_release_request(req); 9176c75dc0dSFred Isaman } 9186c75dc0dSFred Isaman out: 9196c75dc0dSFred Isaman hdr->release(hdr); 9206c75dc0dSFred Isaman } 9216c75dc0dSFred Isaman 92289d77c8fSBryan Schumaker #if IS_ENABLED(CONFIG_NFS_V3) || IS_ENABLED(CONFIG_NFS_V4) 923ce59515cSAnna Schumaker unsigned long 924ea2cf228SFred Isaman nfs_reqs_to_commit(struct nfs_commit_info *cinfo) 925fb8a1f11STrond Myklebust { 926ea2cf228SFred Isaman return cinfo->mds->ncommit; 927fb8a1f11STrond Myklebust } 928fb8a1f11STrond Myklebust 929ea2cf228SFred Isaman /* cinfo->lock held by caller */ 9301763da12SFred Isaman int 931ea2cf228SFred Isaman nfs_scan_commit_list(struct list_head *src, struct list_head *dst, 932ea2cf228SFred Isaman struct nfs_commit_info *cinfo, int max) 933d6d6dc7cSFred Isaman { 934d6d6dc7cSFred Isaman struct nfs_page *req, *tmp; 935d6d6dc7cSFred Isaman int ret = 0; 936d6d6dc7cSFred Isaman 937d6d6dc7cSFred Isaman list_for_each_entry_safe(req, tmp, src, wb_list) { 9388dd37758STrond Myklebust if (!nfs_lock_request(req)) 9398dd37758STrond Myklebust continue; 9407ad84aa9STrond Myklebust kref_get(&req->wb_kref); 941ea2cf228SFred Isaman if (cond_resched_lock(cinfo->lock)) 9423b3be88dSTrond Myklebust list_safe_reset_next(req, tmp, wb_list); 943ea2cf228SFred Isaman nfs_request_remove_commit_list(req, cinfo); 9448dd37758STrond Myklebust nfs_list_add_request(req, dst); 945d6d6dc7cSFred Isaman ret++; 9461763da12SFred Isaman if ((ret == max) && !cinfo->dreq) 947d6d6dc7cSFred Isaman break; 948d6d6dc7cSFred Isaman } 949d6d6dc7cSFred Isaman return ret; 950d6d6dc7cSFred Isaman } 951d6d6dc7cSFred Isaman 9521da177e4SLinus Torvalds /* 9531da177e4SLinus Torvalds * nfs_scan_commit - Scan an inode for commit requests 9541da177e4SLinus Torvalds * @inode: NFS inode to scan 955ea2cf228SFred Isaman * @dst: mds destination list 956ea2cf228SFred Isaman * @cinfo: mds and ds lists of reqs ready to commit 9571da177e4SLinus Torvalds * 9581da177e4SLinus Torvalds * Moves requests from the inode's 'commit' request list. 9591da177e4SLinus Torvalds * The requests are *not* checked to ensure that they form a contiguous set. 9601da177e4SLinus Torvalds */ 9611763da12SFred Isaman int 962ea2cf228SFred Isaman nfs_scan_commit(struct inode *inode, struct list_head *dst, 963ea2cf228SFred Isaman struct nfs_commit_info *cinfo) 9641da177e4SLinus Torvalds { 965d6d6dc7cSFred Isaman int ret = 0; 966fb8a1f11STrond Myklebust 967ea2cf228SFred Isaman spin_lock(cinfo->lock); 968ea2cf228SFred Isaman if (cinfo->mds->ncommit > 0) { 9698dd37758STrond Myklebust const int max = INT_MAX; 970d6d6dc7cSFred Isaman 971ea2cf228SFred Isaman ret = nfs_scan_commit_list(&cinfo->mds->list, dst, 972ea2cf228SFred Isaman cinfo, max); 973ea2cf228SFred Isaman ret += pnfs_scan_commit_lists(inode, cinfo, max - ret); 974d6d6dc7cSFred Isaman } 975ea2cf228SFred Isaman spin_unlock(cinfo->lock); 976ff778d02STrond Myklebust return ret; 9771da177e4SLinus Torvalds } 978d6d6dc7cSFred Isaman 979c42de9ddSTrond Myklebust #else 980ce59515cSAnna Schumaker unsigned long nfs_reqs_to_commit(struct nfs_commit_info *cinfo) 981fb8a1f11STrond Myklebust { 982fb8a1f11STrond Myklebust return 0; 983fb8a1f11STrond Myklebust } 984fb8a1f11STrond Myklebust 9851763da12SFred Isaman int nfs_scan_commit(struct inode *inode, struct list_head *dst, 986ea2cf228SFred Isaman struct nfs_commit_info *cinfo) 987c42de9ddSTrond Myklebust { 988c42de9ddSTrond Myklebust return 0; 989c42de9ddSTrond Myklebust } 9901da177e4SLinus Torvalds #endif 9911da177e4SLinus Torvalds 9921da177e4SLinus Torvalds /* 993e7d39069STrond Myklebust * Search for an existing write request, and attempt to update 994e7d39069STrond Myklebust * it to reflect a new dirty region on a given page. 9951da177e4SLinus Torvalds * 996e7d39069STrond Myklebust * If the attempt fails, then the existing request is flushed out 997e7d39069STrond Myklebust * to disk. 9981da177e4SLinus Torvalds */ 999e7d39069STrond Myklebust static struct nfs_page *nfs_try_to_update_request(struct inode *inode, 1000e7d39069STrond Myklebust struct page *page, 1001e7d39069STrond Myklebust unsigned int offset, 1002e7d39069STrond Myklebust unsigned int bytes) 10031da177e4SLinus Torvalds { 1004e7d39069STrond Myklebust struct nfs_page *req; 1005e7d39069STrond Myklebust unsigned int rqend; 1006e7d39069STrond Myklebust unsigned int end; 10071da177e4SLinus Torvalds int error; 1008277459d2STrond Myklebust 1009e7d39069STrond Myklebust if (!PagePrivate(page)) 1010e7d39069STrond Myklebust return NULL; 1011e7d39069STrond Myklebust 1012e7d39069STrond Myklebust end = offset + bytes; 1013e7d39069STrond Myklebust spin_lock(&inode->i_lock); 1014e7d39069STrond Myklebust 1015e7d39069STrond Myklebust for (;;) { 101684d3a9a9SWeston Andros Adamson req = nfs_page_find_head_request_locked(NFS_I(inode), page); 1017e7d39069STrond Myklebust if (req == NULL) 1018e7d39069STrond Myklebust goto out_unlock; 1019e7d39069STrond Myklebust 10202bfc6e56SWeston Andros Adamson /* should be handled by nfs_flush_incompatible */ 10212bfc6e56SWeston Andros Adamson WARN_ON_ONCE(req->wb_head != req); 10222bfc6e56SWeston Andros Adamson WARN_ON_ONCE(req->wb_this_page != req); 10232bfc6e56SWeston Andros Adamson 1024e7d39069STrond Myklebust rqend = req->wb_offset + req->wb_bytes; 1025e7d39069STrond Myklebust /* 1026e7d39069STrond Myklebust * Tell the caller to flush out the request if 1027e7d39069STrond Myklebust * the offsets are non-contiguous. 1028e7d39069STrond Myklebust * Note: nfs_flush_incompatible() will already 1029e7d39069STrond Myklebust * have flushed out requests having wrong owners. 1030e7d39069STrond Myklebust */ 1031e468bae9STrond Myklebust if (offset > rqend 1032e7d39069STrond Myklebust || end < req->wb_offset) 1033e7d39069STrond Myklebust goto out_flushme; 1034e7d39069STrond Myklebust 10357ad84aa9STrond Myklebust if (nfs_lock_request(req)) 1036e7d39069STrond Myklebust break; 1037e7d39069STrond Myklebust 1038e7d39069STrond Myklebust /* The request is locked, so wait and then retry */ 1039587142f8STrond Myklebust spin_unlock(&inode->i_lock); 10401da177e4SLinus Torvalds error = nfs_wait_on_request(req); 10411da177e4SLinus Torvalds nfs_release_request(req); 1042e7d39069STrond Myklebust if (error != 0) 1043e7d39069STrond Myklebust goto out_err; 1044e7d39069STrond Myklebust spin_lock(&inode->i_lock); 10451da177e4SLinus Torvalds } 10461da177e4SLinus Torvalds 10471da177e4SLinus Torvalds /* Okay, the request matches. Update the region */ 10481da177e4SLinus Torvalds if (offset < req->wb_offset) { 10491da177e4SLinus Torvalds req->wb_offset = offset; 10501da177e4SLinus Torvalds req->wb_pgbase = offset; 10511da177e4SLinus Torvalds } 10521da177e4SLinus Torvalds if (end > rqend) 10531da177e4SLinus Torvalds req->wb_bytes = end - req->wb_offset; 1054e7d39069STrond Myklebust else 1055e7d39069STrond Myklebust req->wb_bytes = rqend - req->wb_offset; 1056e7d39069STrond Myklebust out_unlock: 1057ca138f36SFred Isaman if (req) 10588dd37758STrond Myklebust nfs_clear_request_commit(req); 1059411a99adSWeston Andros Adamson spin_unlock(&inode->i_lock); 1060e7d39069STrond Myklebust return req; 1061e7d39069STrond Myklebust out_flushme: 1062e7d39069STrond Myklebust spin_unlock(&inode->i_lock); 1063e7d39069STrond Myklebust nfs_release_request(req); 1064e7d39069STrond Myklebust error = nfs_wb_page(inode, page); 1065e7d39069STrond Myklebust out_err: 1066e7d39069STrond Myklebust return ERR_PTR(error); 1067e7d39069STrond Myklebust } 10681da177e4SLinus Torvalds 1069e7d39069STrond Myklebust /* 1070e7d39069STrond Myklebust * Try to update an existing write request, or create one if there is none. 1071e7d39069STrond Myklebust * 1072e7d39069STrond Myklebust * Note: Should always be called with the Page Lock held to prevent races 1073e7d39069STrond Myklebust * if we have to add a new request. Also assumes that the caller has 1074e7d39069STrond Myklebust * already called nfs_flush_incompatible() if necessary. 1075e7d39069STrond Myklebust */ 1076e7d39069STrond Myklebust static struct nfs_page * nfs_setup_write_request(struct nfs_open_context* ctx, 1077e7d39069STrond Myklebust struct page *page, unsigned int offset, unsigned int bytes) 1078e7d39069STrond Myklebust { 1079d56b4ddfSMel Gorman struct inode *inode = page_file_mapping(page)->host; 1080e7d39069STrond Myklebust struct nfs_page *req; 1081e7d39069STrond Myklebust 1082e7d39069STrond Myklebust req = nfs_try_to_update_request(inode, page, offset, bytes); 1083e7d39069STrond Myklebust if (req != NULL) 1084e7d39069STrond Myklebust goto out; 10852bfc6e56SWeston Andros Adamson req = nfs_create_request(ctx, page, NULL, offset, bytes); 1086e7d39069STrond Myklebust if (IS_ERR(req)) 1087e7d39069STrond Myklebust goto out; 1088d6d6dc7cSFred Isaman nfs_inode_add_request(inode, req); 1089efc91ed0STrond Myklebust out: 109061e930a9STrond Myklebust return req; 10911da177e4SLinus Torvalds } 10921da177e4SLinus Torvalds 1093e7d39069STrond Myklebust static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page, 1094e7d39069STrond Myklebust unsigned int offset, unsigned int count) 1095e7d39069STrond Myklebust { 1096e7d39069STrond Myklebust struct nfs_page *req; 1097e7d39069STrond Myklebust 1098e7d39069STrond Myklebust req = nfs_setup_write_request(ctx, page, offset, count); 1099e7d39069STrond Myklebust if (IS_ERR(req)) 1100e7d39069STrond Myklebust return PTR_ERR(req); 1101e7d39069STrond Myklebust /* Update file length */ 1102e7d39069STrond Myklebust nfs_grow_file(page, offset, count); 1103d72ddcbaSWeston Andros Adamson nfs_mark_uptodate(req); 1104a6305ddbSTrond Myklebust nfs_mark_request_dirty(req); 11051d1afcbcSTrond Myklebust nfs_unlock_and_release_request(req); 1106e7d39069STrond Myklebust return 0; 1107e7d39069STrond Myklebust } 1108e7d39069STrond Myklebust 11091da177e4SLinus Torvalds int nfs_flush_incompatible(struct file *file, struct page *page) 11101da177e4SLinus Torvalds { 1111cd3758e3STrond Myklebust struct nfs_open_context *ctx = nfs_file_open_context(file); 11122a369153STrond Myklebust struct nfs_lock_context *l_ctx; 11131da177e4SLinus Torvalds struct nfs_page *req; 11141a54533eSTrond Myklebust int do_flush, status; 11151da177e4SLinus Torvalds /* 11161da177e4SLinus Torvalds * Look for a request corresponding to this page. If there 11171da177e4SLinus Torvalds * is one, and it belongs to another file, we flush it out 11181da177e4SLinus Torvalds * before we try to copy anything into the page. Do this 11191da177e4SLinus Torvalds * due to the lack of an ACCESS-type call in NFSv2. 11201da177e4SLinus Torvalds * Also do the same if we find a request from an existing 11211da177e4SLinus Torvalds * dropped page. 11221da177e4SLinus Torvalds */ 11231a54533eSTrond Myklebust do { 112484d3a9a9SWeston Andros Adamson req = nfs_page_find_head_request(page); 11251a54533eSTrond Myklebust if (req == NULL) 11261a54533eSTrond Myklebust return 0; 11272a369153STrond Myklebust l_ctx = req->wb_lock_context; 11282a369153STrond Myklebust do_flush = req->wb_page != page || req->wb_context != ctx; 11292bfc6e56SWeston Andros Adamson /* for now, flush if more than 1 request in page_group */ 11302bfc6e56SWeston Andros Adamson do_flush |= req->wb_this_page != req; 11310f1d2605STrond Myklebust if (l_ctx && ctx->dentry->d_inode->i_flock != NULL) { 11322a369153STrond Myklebust do_flush |= l_ctx->lockowner.l_owner != current->files 11332a369153STrond Myklebust || l_ctx->lockowner.l_pid != current->tgid; 11342a369153STrond Myklebust } 11351da177e4SLinus Torvalds nfs_release_request(req); 11361a54533eSTrond Myklebust if (!do_flush) 11371a54533eSTrond Myklebust return 0; 1138d56b4ddfSMel Gorman status = nfs_wb_page(page_file_mapping(page)->host, page); 11391a54533eSTrond Myklebust } while (status == 0); 11401a54533eSTrond Myklebust return status; 11411da177e4SLinus Torvalds } 11421da177e4SLinus Torvalds 11431da177e4SLinus Torvalds /* 1144dc24826bSAndy Adamson * Avoid buffered writes when a open context credential's key would 1145dc24826bSAndy Adamson * expire soon. 1146dc24826bSAndy Adamson * 1147dc24826bSAndy Adamson * Returns -EACCES if the key will expire within RPC_KEY_EXPIRE_FAIL. 1148dc24826bSAndy Adamson * 1149dc24826bSAndy Adamson * Return 0 and set a credential flag which triggers the inode to flush 1150dc24826bSAndy Adamson * and performs NFS_FILE_SYNC writes if the key will expired within 1151dc24826bSAndy Adamson * RPC_KEY_EXPIRE_TIMEO. 1152dc24826bSAndy Adamson */ 1153dc24826bSAndy Adamson int 1154dc24826bSAndy Adamson nfs_key_timeout_notify(struct file *filp, struct inode *inode) 1155dc24826bSAndy Adamson { 1156dc24826bSAndy Adamson struct nfs_open_context *ctx = nfs_file_open_context(filp); 1157dc24826bSAndy Adamson struct rpc_auth *auth = NFS_SERVER(inode)->client->cl_auth; 1158dc24826bSAndy Adamson 1159dc24826bSAndy Adamson return rpcauth_key_timeout_notify(auth, ctx->cred); 1160dc24826bSAndy Adamson } 1161dc24826bSAndy Adamson 1162dc24826bSAndy Adamson /* 1163dc24826bSAndy Adamson * Test if the open context credential key is marked to expire soon. 1164dc24826bSAndy Adamson */ 1165dc24826bSAndy Adamson bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx) 1166dc24826bSAndy Adamson { 1167dc24826bSAndy Adamson return rpcauth_cred_key_to_expire(ctx->cred); 1168dc24826bSAndy Adamson } 1169dc24826bSAndy Adamson 1170dc24826bSAndy Adamson /* 11715d47a356STrond Myklebust * If the page cache is marked as unsafe or invalid, then we can't rely on 11725d47a356STrond Myklebust * the PageUptodate() flag. In this case, we will need to turn off 11735d47a356STrond Myklebust * write optimisations that depend on the page contents being correct. 11745d47a356STrond Myklebust */ 11758d197a56STrond Myklebust static bool nfs_write_pageuptodate(struct page *page, struct inode *inode) 11765d47a356STrond Myklebust { 1177d529ef83SJeff Layton struct nfs_inode *nfsi = NFS_I(inode); 1178d529ef83SJeff Layton 11798d197a56STrond Myklebust if (nfs_have_delegated_attributes(inode)) 11808d197a56STrond Myklebust goto out; 118118dd78c4SScott Mayhew if (nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE) 1182d529ef83SJeff Layton return false; 11834db72b40SJeff Layton smp_rmb(); 1184d529ef83SJeff Layton if (test_bit(NFS_INO_INVALIDATING, &nfsi->flags)) 11858d197a56STrond Myklebust return false; 11868d197a56STrond Myklebust out: 118718dd78c4SScott Mayhew if (nfsi->cache_validity & NFS_INO_INVALID_DATA) 118818dd78c4SScott Mayhew return false; 11898d197a56STrond Myklebust return PageUptodate(page) != 0; 11905d47a356STrond Myklebust } 11915d47a356STrond Myklebust 1192c7559663SScott Mayhew /* If we know the page is up to date, and we're not using byte range locks (or 1193c7559663SScott Mayhew * if we have the whole file locked for writing), it may be more efficient to 1194c7559663SScott Mayhew * extend the write to cover the entire page in order to avoid fragmentation 1195c7559663SScott Mayhew * inefficiencies. 1196c7559663SScott Mayhew * 1197263b4509SScott Mayhew * If the file is opened for synchronous writes then we can just skip the rest 1198263b4509SScott Mayhew * of the checks. 1199c7559663SScott Mayhew */ 1200c7559663SScott Mayhew static int nfs_can_extend_write(struct file *file, struct page *page, struct inode *inode) 1201c7559663SScott Mayhew { 1202c7559663SScott Mayhew if (file->f_flags & O_DSYNC) 1203c7559663SScott Mayhew return 0; 1204263b4509SScott Mayhew if (!nfs_write_pageuptodate(page, inode)) 1205263b4509SScott Mayhew return 0; 1206c7559663SScott Mayhew if (NFS_PROTO(inode)->have_delegation(inode, FMODE_WRITE)) 1207c7559663SScott Mayhew return 1; 1208263b4509SScott Mayhew if (inode->i_flock == NULL || (inode->i_flock->fl_start == 0 && 1209c7559663SScott Mayhew inode->i_flock->fl_end == OFFSET_MAX && 1210263b4509SScott Mayhew inode->i_flock->fl_type != F_RDLCK)) 1211c7559663SScott Mayhew return 1; 1212c7559663SScott Mayhew return 0; 1213c7559663SScott Mayhew } 1214c7559663SScott Mayhew 12155d47a356STrond Myklebust /* 12161da177e4SLinus Torvalds * Update and possibly write a cached page of an NFS file. 12171da177e4SLinus Torvalds * 12181da177e4SLinus Torvalds * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad 12191da177e4SLinus Torvalds * things with a page scheduled for an RPC call (e.g. invalidate it). 12201da177e4SLinus Torvalds */ 12211da177e4SLinus Torvalds int nfs_updatepage(struct file *file, struct page *page, 12221da177e4SLinus Torvalds unsigned int offset, unsigned int count) 12231da177e4SLinus Torvalds { 1224cd3758e3STrond Myklebust struct nfs_open_context *ctx = nfs_file_open_context(file); 1225d56b4ddfSMel Gorman struct inode *inode = page_file_mapping(page)->host; 12261da177e4SLinus Torvalds int status = 0; 12271da177e4SLinus Torvalds 122891d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE); 122991d5b470SChuck Lever 12306de1472fSAl Viro dprintk("NFS: nfs_updatepage(%pD2 %d@%lld)\n", 12316de1472fSAl Viro file, count, (long long)(page_file_offset(page) + offset)); 12321da177e4SLinus Torvalds 1233c7559663SScott Mayhew if (nfs_can_extend_write(file, page, inode)) { 123449a70f27STrond Myklebust count = max(count + offset, nfs_page_length(page)); 12351da177e4SLinus Torvalds offset = 0; 12361da177e4SLinus Torvalds } 12371da177e4SLinus Torvalds 1238e21195a7STrond Myklebust status = nfs_writepage_setup(ctx, page, offset, count); 123903fa9e84STrond Myklebust if (status < 0) 124003fa9e84STrond Myklebust nfs_set_pageerror(page); 124159b7c05fSTrond Myklebust else 124259b7c05fSTrond Myklebust __set_page_dirty_nobuffers(page); 12431da177e4SLinus Torvalds 124448186c7dSChuck Lever dprintk("NFS: nfs_updatepage returns %d (isize %lld)\n", 12451da177e4SLinus Torvalds status, (long long)i_size_read(inode)); 12461da177e4SLinus Torvalds return status; 12471da177e4SLinus Torvalds } 12481da177e4SLinus Torvalds 12493ff7576dSTrond Myklebust static int flush_task_priority(int how) 12501da177e4SLinus Torvalds { 12511da177e4SLinus Torvalds switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) { 12521da177e4SLinus Torvalds case FLUSH_HIGHPRI: 12531da177e4SLinus Torvalds return RPC_PRIORITY_HIGH; 12541da177e4SLinus Torvalds case FLUSH_LOWPRI: 12551da177e4SLinus Torvalds return RPC_PRIORITY_LOW; 12561da177e4SLinus Torvalds } 12571da177e4SLinus Torvalds return RPC_PRIORITY_NORMAL; 12581da177e4SLinus Torvalds } 12591da177e4SLinus Torvalds 1260d45f60c6SWeston Andros Adamson static void nfs_initiate_write(struct nfs_pgio_header *hdr, 1261d45f60c6SWeston Andros Adamson struct rpc_message *msg, 12621ed26f33SAnna Schumaker struct rpc_task_setup *task_setup_data, int how) 12631da177e4SLinus Torvalds { 1264d45f60c6SWeston Andros Adamson struct inode *inode = hdr->inode; 12653ff7576dSTrond Myklebust int priority = flush_task_priority(how); 12661da177e4SLinus Torvalds 12671ed26f33SAnna Schumaker task_setup_data->priority = priority; 1268d45f60c6SWeston Andros Adamson NFS_PROTO(inode)->write_setup(hdr, msg); 1269d138d5d1SAndy Adamson 12708c21c62cSWeston Andros Adamson nfs4_state_protect_write(NFS_SERVER(inode)->nfs_client, 1271d45f60c6SWeston Andros Adamson &task_setup_data->rpc_client, msg, hdr); 1272275acaafSTrond Myklebust } 1273275acaafSTrond Myklebust 12746d884e8fSFred /* If a nfs_flush_* function fails, it should remove reqs from @head and 12756d884e8fSFred * call this on each, which will prepare them to be retried on next 12766d884e8fSFred * writeback using standard nfs. 12776d884e8fSFred */ 12786d884e8fSFred static void nfs_redirty_request(struct nfs_page *req) 12796d884e8fSFred { 12806d884e8fSFred nfs_mark_request_dirty(req); 12811d1afcbcSTrond Myklebust nfs_unlock_request(req); 128220633f04SWeston Andros Adamson nfs_end_page_writeback(req); 12833aff4ebbSTrond Myklebust nfs_release_request(req); 12846d884e8fSFred } 12856d884e8fSFred 1286061ae2edSFred Isaman static void nfs_async_write_error(struct list_head *head) 12876c75dc0dSFred Isaman { 12886c75dc0dSFred Isaman struct nfs_page *req; 12896c75dc0dSFred Isaman 12906c75dc0dSFred Isaman while (!list_empty(head)) { 12916c75dc0dSFred Isaman req = nfs_list_entry(head->next); 12926c75dc0dSFred Isaman nfs_list_remove_request(req); 12936c75dc0dSFred Isaman nfs_redirty_request(req); 12946c75dc0dSFred Isaman } 12956c75dc0dSFred Isaman } 12966c75dc0dSFred Isaman 1297061ae2edSFred Isaman static const struct nfs_pgio_completion_ops nfs_async_write_completion_ops = { 1298061ae2edSFred Isaman .error_cleanup = nfs_async_write_error, 1299061ae2edSFred Isaman .completion = nfs_write_completion, 1300061ae2edSFred Isaman }; 1301061ae2edSFred Isaman 130257208fa7SBryan Schumaker void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, 1303a20c93e3SChristoph Hellwig struct inode *inode, int ioflags, bool force_mds, 1304061ae2edSFred Isaman const struct nfs_pgio_completion_ops *compl_ops) 13051751c363STrond Myklebust { 1306a20c93e3SChristoph Hellwig struct nfs_server *server = NFS_SERVER(inode); 130741d8d5b7SAnna Schumaker const struct nfs_pageio_ops *pg_ops = &nfs_pgio_rw_ops; 1308a20c93e3SChristoph Hellwig 1309a20c93e3SChristoph Hellwig #ifdef CONFIG_NFS_V4_1 1310a20c93e3SChristoph Hellwig if (server->pnfs_curr_ld && !force_mds) 1311a20c93e3SChristoph Hellwig pg_ops = server->pnfs_curr_ld->pg_write_ops; 1312a20c93e3SChristoph Hellwig #endif 13134a0de55cSAnna Schumaker nfs_pageio_init(pgio, inode, pg_ops, compl_ops, &nfs_rw_write_ops, 13144a0de55cSAnna Schumaker server->wsize, ioflags); 13151751c363STrond Myklebust } 1316ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_pageio_init_write); 13171751c363STrond Myklebust 1318dce81290STrond Myklebust void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio) 1319dce81290STrond Myklebust { 132041d8d5b7SAnna Schumaker pgio->pg_ops = &nfs_pgio_rw_ops; 1321dce81290STrond Myklebust pgio->pg_bsize = NFS_SERVER(pgio->pg_inode)->wsize; 1322dce81290STrond Myklebust } 13231f945357STrond Myklebust EXPORT_SYMBOL_GPL(nfs_pageio_reset_write_mds); 1324dce81290STrond Myklebust 13251da177e4SLinus Torvalds 13260b7c0153SFred Isaman void nfs_commit_prepare(struct rpc_task *task, void *calldata) 13270b7c0153SFred Isaman { 13280b7c0153SFred Isaman struct nfs_commit_data *data = calldata; 13290b7c0153SFred Isaman 13300b7c0153SFred Isaman NFS_PROTO(data->inode)->commit_rpc_prepare(task, data); 13310b7c0153SFred Isaman } 13320b7c0153SFred Isaman 1333d45f60c6SWeston Andros Adamson static void nfs_writeback_release_common(struct nfs_pgio_header *hdr) 13341da177e4SLinus Torvalds { 1335c65e6254SWeston Andros Adamson /* do nothing! */ 13361da177e4SLinus Torvalds } 13371da177e4SLinus Torvalds 13381f2edbe3STrond Myklebust /* 13391f2edbe3STrond Myklebust * Special version of should_remove_suid() that ignores capabilities. 13401f2edbe3STrond Myklebust */ 13411f2edbe3STrond Myklebust static int nfs_should_remove_suid(const struct inode *inode) 13421f2edbe3STrond Myklebust { 13431f2edbe3STrond Myklebust umode_t mode = inode->i_mode; 13441f2edbe3STrond Myklebust int kill = 0; 1345788e7a89STrond Myklebust 13461f2edbe3STrond Myklebust /* suid always must be killed */ 13471f2edbe3STrond Myklebust if (unlikely(mode & S_ISUID)) 13481f2edbe3STrond Myklebust kill = ATTR_KILL_SUID; 13491f2edbe3STrond Myklebust 13501f2edbe3STrond Myklebust /* 13511f2edbe3STrond Myklebust * sgid without any exec bits is just a mandatory locking mark; leave 13521f2edbe3STrond Myklebust * it alone. If some exec bits are set, it's a real sgid; kill it. 13531f2edbe3STrond Myklebust */ 13541f2edbe3STrond Myklebust if (unlikely((mode & S_ISGID) && (mode & S_IXGRP))) 13551f2edbe3STrond Myklebust kill |= ATTR_KILL_SGID; 13561f2edbe3STrond Myklebust 13571f2edbe3STrond Myklebust if (unlikely(kill && S_ISREG(mode))) 13581f2edbe3STrond Myklebust return kill; 13591f2edbe3STrond Myklebust 13601f2edbe3STrond Myklebust return 0; 13611f2edbe3STrond Myklebust } 1362788e7a89STrond Myklebust 13631da177e4SLinus Torvalds /* 13641da177e4SLinus Torvalds * This function is called when the WRITE call is complete. 13651da177e4SLinus Torvalds */ 1366d45f60c6SWeston Andros Adamson static int nfs_writeback_done(struct rpc_task *task, 1367d45f60c6SWeston Andros Adamson struct nfs_pgio_header *hdr, 13680eecb214SAnna Schumaker struct inode *inode) 13691da177e4SLinus Torvalds { 1370788e7a89STrond Myklebust int status; 13711da177e4SLinus Torvalds 1372f551e44fSChuck Lever /* 1373f551e44fSChuck Lever * ->write_done will attempt to use post-op attributes to detect 1374f551e44fSChuck Lever * conflicting writes by other clients. A strict interpretation 1375f551e44fSChuck Lever * of close-to-open would allow us to continue caching even if 1376f551e44fSChuck Lever * another writer had changed the file, but some applications 1377f551e44fSChuck Lever * depend on tighter cache coherency when writing. 1378f551e44fSChuck Lever */ 1379d45f60c6SWeston Andros Adamson status = NFS_PROTO(inode)->write_done(task, hdr); 1380788e7a89STrond Myklebust if (status != 0) 13810eecb214SAnna Schumaker return status; 1382d45f60c6SWeston Andros Adamson nfs_add_stats(inode, NFSIOS_SERVERWRITTENBYTES, hdr->res.count); 138391d5b470SChuck Lever 138489d77c8fSBryan Schumaker #if IS_ENABLED(CONFIG_NFS_V3) || IS_ENABLED(CONFIG_NFS_V4) 1385d45f60c6SWeston Andros Adamson if (hdr->res.verf->committed < hdr->args.stable && 1386d45f60c6SWeston Andros Adamson task->tk_status >= 0) { 13871da177e4SLinus Torvalds /* We tried a write call, but the server did not 13881da177e4SLinus Torvalds * commit data to stable storage even though we 13891da177e4SLinus Torvalds * requested it. 13901da177e4SLinus Torvalds * Note: There is a known bug in Tru64 < 5.0 in which 13911da177e4SLinus Torvalds * the server reports NFS_DATA_SYNC, but performs 13921da177e4SLinus Torvalds * NFS_FILE_SYNC. We therefore implement this checking 13931da177e4SLinus Torvalds * as a dprintk() in order to avoid filling syslog. 13941da177e4SLinus Torvalds */ 13951da177e4SLinus Torvalds static unsigned long complain; 13961da177e4SLinus Torvalds 1397a69aef14SFred Isaman /* Note this will print the MDS for a DS write */ 13981da177e4SLinus Torvalds if (time_before(complain, jiffies)) { 13991da177e4SLinus Torvalds dprintk("NFS: faulty NFS server %s:" 14001da177e4SLinus Torvalds " (committed = %d) != (stable = %d)\n", 1401cd841605SFred Isaman NFS_SERVER(inode)->nfs_client->cl_hostname, 1402d45f60c6SWeston Andros Adamson hdr->res.verf->committed, hdr->args.stable); 14031da177e4SLinus Torvalds complain = jiffies + 300 * HZ; 14041da177e4SLinus Torvalds } 14051da177e4SLinus Torvalds } 14061da177e4SLinus Torvalds #endif 14071f2edbe3STrond Myklebust 14081f2edbe3STrond Myklebust /* Deal with the suid/sgid bit corner case */ 14091f2edbe3STrond Myklebust if (nfs_should_remove_suid(inode)) 14101f2edbe3STrond Myklebust nfs_mark_for_revalidate(inode); 14110eecb214SAnna Schumaker return 0; 14120eecb214SAnna Schumaker } 14130eecb214SAnna Schumaker 14140eecb214SAnna Schumaker /* 14150eecb214SAnna Schumaker * This function is called when the WRITE call is complete. 14160eecb214SAnna Schumaker */ 1417d45f60c6SWeston Andros Adamson static void nfs_writeback_result(struct rpc_task *task, 1418d45f60c6SWeston Andros Adamson struct nfs_pgio_header *hdr) 14190eecb214SAnna Schumaker { 1420d45f60c6SWeston Andros Adamson struct nfs_pgio_args *argp = &hdr->args; 1421d45f60c6SWeston Andros Adamson struct nfs_pgio_res *resp = &hdr->res; 14221f2edbe3STrond Myklebust 14231f2edbe3STrond Myklebust if (resp->count < argp->count) { 14241da177e4SLinus Torvalds static unsigned long complain; 14251da177e4SLinus Torvalds 14266c75dc0dSFred Isaman /* This a short write! */ 1427d45f60c6SWeston Andros Adamson nfs_inc_stats(hdr->inode, NFSIOS_SHORTWRITE); 142891d5b470SChuck Lever 14291da177e4SLinus Torvalds /* Has the server at least made some progress? */ 14306c75dc0dSFred Isaman if (resp->count == 0) { 14316c75dc0dSFred Isaman if (time_before(complain, jiffies)) { 14326c75dc0dSFred Isaman printk(KERN_WARNING 14336c75dc0dSFred Isaman "NFS: Server wrote zero bytes, expected %u.\n", 14346c75dc0dSFred Isaman argp->count); 14356c75dc0dSFred Isaman complain = jiffies + 300 * HZ; 14366c75dc0dSFred Isaman } 1437d45f60c6SWeston Andros Adamson nfs_set_pgio_error(hdr, -EIO, argp->offset); 14386c75dc0dSFred Isaman task->tk_status = -EIO; 14396c75dc0dSFred Isaman return; 14406c75dc0dSFred Isaman } 14411da177e4SLinus Torvalds /* Was this an NFSv2 write or an NFSv3 stable write? */ 14421da177e4SLinus Torvalds if (resp->verf->committed != NFS_UNSTABLE) { 14431da177e4SLinus Torvalds /* Resend from where the server left off */ 1444d45f60c6SWeston Andros Adamson hdr->mds_offset += resp->count; 14451da177e4SLinus Torvalds argp->offset += resp->count; 14461da177e4SLinus Torvalds argp->pgbase += resp->count; 14471da177e4SLinus Torvalds argp->count -= resp->count; 14481da177e4SLinus Torvalds } else { 14491da177e4SLinus Torvalds /* Resend as a stable write in order to avoid 14501da177e4SLinus Torvalds * headaches in the case of a server crash. 14511da177e4SLinus Torvalds */ 14521da177e4SLinus Torvalds argp->stable = NFS_FILE_SYNC; 14531da177e4SLinus Torvalds } 1454d00c5d43STrond Myklebust rpc_restart_call_prepare(task); 14551da177e4SLinus Torvalds } 14561da177e4SLinus Torvalds } 14571da177e4SLinus Torvalds 14581da177e4SLinus Torvalds 145989d77c8fSBryan Schumaker #if IS_ENABLED(CONFIG_NFS_V3) || IS_ENABLED(CONFIG_NFS_V4) 146071d0a611STrond Myklebust static int nfs_commit_set_lock(struct nfs_inode *nfsi, int may_wait) 146171d0a611STrond Myklebust { 1462b8413f98STrond Myklebust int ret; 1463b8413f98STrond Myklebust 146471d0a611STrond Myklebust if (!test_and_set_bit(NFS_INO_COMMIT, &nfsi->flags)) 146571d0a611STrond Myklebust return 1; 1466b8413f98STrond Myklebust if (!may_wait) 146771d0a611STrond Myklebust return 0; 1468b8413f98STrond Myklebust ret = out_of_line_wait_on_bit_lock(&nfsi->flags, 1469b8413f98STrond Myklebust NFS_INO_COMMIT, 1470b8413f98STrond Myklebust nfs_wait_bit_killable, 1471b8413f98STrond Myklebust TASK_KILLABLE); 1472b8413f98STrond Myklebust return (ret < 0) ? ret : 1; 147371d0a611STrond Myklebust } 147471d0a611STrond Myklebust 1475f453a54aSFred Isaman static void nfs_commit_clear_lock(struct nfs_inode *nfsi) 147671d0a611STrond Myklebust { 147771d0a611STrond Myklebust clear_bit(NFS_INO_COMMIT, &nfsi->flags); 14784e857c58SPeter Zijlstra smp_mb__after_atomic(); 147971d0a611STrond Myklebust wake_up_bit(&nfsi->flags, NFS_INO_COMMIT); 148071d0a611STrond Myklebust } 148171d0a611STrond Myklebust 14820b7c0153SFred Isaman void nfs_commitdata_release(struct nfs_commit_data *data) 14831da177e4SLinus Torvalds { 14840b7c0153SFred Isaman put_nfs_open_context(data->context); 14850b7c0153SFred Isaman nfs_commit_free(data); 14861da177e4SLinus Torvalds } 1487e0c2b380SFred Isaman EXPORT_SYMBOL_GPL(nfs_commitdata_release); 14881da177e4SLinus Torvalds 14890b7c0153SFred Isaman int nfs_initiate_commit(struct rpc_clnt *clnt, struct nfs_commit_data *data, 14909ace33cdSFred Isaman const struct rpc_call_ops *call_ops, 14919f0ec176SAndy Adamson int how, int flags) 14921da177e4SLinus Torvalds { 149307737691STrond Myklebust struct rpc_task *task; 14949ace33cdSFred Isaman int priority = flush_task_priority(how); 1495bdc7f021STrond Myklebust struct rpc_message msg = { 1496bdc7f021STrond Myklebust .rpc_argp = &data->args, 1497bdc7f021STrond Myklebust .rpc_resp = &data->res, 14989ace33cdSFred Isaman .rpc_cred = data->cred, 1499bdc7f021STrond Myklebust }; 150084115e1cSTrond Myklebust struct rpc_task_setup task_setup_data = { 150107737691STrond Myklebust .task = &data->task, 15029ace33cdSFred Isaman .rpc_client = clnt, 1503bdc7f021STrond Myklebust .rpc_message = &msg, 15049ace33cdSFred Isaman .callback_ops = call_ops, 150584115e1cSTrond Myklebust .callback_data = data, 1506101070caSTrond Myklebust .workqueue = nfsiod_workqueue, 15079f0ec176SAndy Adamson .flags = RPC_TASK_ASYNC | flags, 15083ff7576dSTrond Myklebust .priority = priority, 150984115e1cSTrond Myklebust }; 1510788e7a89STrond Myklebust /* Set up the initial task struct. */ 15119ace33cdSFred Isaman NFS_PROTO(data->inode)->commit_setup(data, &msg); 15121da177e4SLinus Torvalds 1513a3f565b1SChuck Lever dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid); 1514bdc7f021STrond Myklebust 15158c21c62cSWeston Andros Adamson nfs4_state_protect(NFS_SERVER(data->inode)->nfs_client, 15168c21c62cSWeston Andros Adamson NFS_SP4_MACH_CRED_COMMIT, &task_setup_data.rpc_client, &msg); 15178c21c62cSWeston Andros Adamson 151807737691STrond Myklebust task = rpc_run_task(&task_setup_data); 1519dbae4c73STrond Myklebust if (IS_ERR(task)) 1520dbae4c73STrond Myklebust return PTR_ERR(task); 1521d2224e7aSJeff Layton if (how & FLUSH_SYNC) 1522d2224e7aSJeff Layton rpc_wait_for_completion_task(task); 152307737691STrond Myklebust rpc_put_task(task); 1524dbae4c73STrond Myklebust return 0; 15251da177e4SLinus Torvalds } 1526e0c2b380SFred Isaman EXPORT_SYMBOL_GPL(nfs_initiate_commit); 15271da177e4SLinus Torvalds 15281da177e4SLinus Torvalds /* 15299ace33cdSFred Isaman * Set up the argument/result storage required for the RPC call. 15309ace33cdSFred Isaman */ 15310b7c0153SFred Isaman void nfs_init_commit(struct nfs_commit_data *data, 1532988b6dceSFred Isaman struct list_head *head, 1533f453a54aSFred Isaman struct pnfs_layout_segment *lseg, 1534f453a54aSFred Isaman struct nfs_commit_info *cinfo) 15359ace33cdSFred Isaman { 15369ace33cdSFred Isaman struct nfs_page *first = nfs_list_entry(head->next); 15373d4ff43dSAl Viro struct inode *inode = first->wb_context->dentry->d_inode; 15389ace33cdSFred Isaman 15399ace33cdSFred Isaman /* Set up the RPC argument and reply structs 15409ace33cdSFred Isaman * NB: take care not to mess about with data->commit et al. */ 15419ace33cdSFred Isaman 15429ace33cdSFred Isaman list_splice_init(head, &data->pages); 15439ace33cdSFred Isaman 15449ace33cdSFred Isaman data->inode = inode; 15459ace33cdSFred Isaman data->cred = first->wb_context->cred; 1546988b6dceSFred Isaman data->lseg = lseg; /* reference transferred */ 15479ace33cdSFred Isaman data->mds_ops = &nfs_commit_ops; 1548f453a54aSFred Isaman data->completion_ops = cinfo->completion_ops; 1549b359f9d0SFred Isaman data->dreq = cinfo->dreq; 15509ace33cdSFred Isaman 15519ace33cdSFred Isaman data->args.fh = NFS_FH(data->inode); 15529ace33cdSFred Isaman /* Note: we always request a commit of the entire inode */ 15539ace33cdSFred Isaman data->args.offset = 0; 15549ace33cdSFred Isaman data->args.count = 0; 15550b7c0153SFred Isaman data->context = get_nfs_open_context(first->wb_context); 15569ace33cdSFred Isaman data->res.fattr = &data->fattr; 15579ace33cdSFred Isaman data->res.verf = &data->verf; 15589ace33cdSFred Isaman nfs_fattr_init(&data->fattr); 15599ace33cdSFred Isaman } 1560e0c2b380SFred Isaman EXPORT_SYMBOL_GPL(nfs_init_commit); 15619ace33cdSFred Isaman 1562e0c2b380SFred Isaman void nfs_retry_commit(struct list_head *page_list, 1563ea2cf228SFred Isaman struct pnfs_layout_segment *lseg, 1564ea2cf228SFred Isaman struct nfs_commit_info *cinfo) 156564bfeb49SFred Isaman { 156664bfeb49SFred Isaman struct nfs_page *req; 156764bfeb49SFred Isaman 156864bfeb49SFred Isaman while (!list_empty(page_list)) { 156964bfeb49SFred Isaman req = nfs_list_entry(page_list->next); 157064bfeb49SFred Isaman nfs_list_remove_request(req); 1571ea2cf228SFred Isaman nfs_mark_request_commit(req, lseg, cinfo); 157256f9cd68SFred Isaman if (!cinfo->dreq) { 157364bfeb49SFred Isaman dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); 1574d56b4ddfSMel Gorman dec_bdi_stat(page_file_mapping(req->wb_page)->backing_dev_info, 157564bfeb49SFred Isaman BDI_RECLAIMABLE); 157656f9cd68SFred Isaman } 15771d1afcbcSTrond Myklebust nfs_unlock_and_release_request(req); 157864bfeb49SFred Isaman } 157964bfeb49SFred Isaman } 1580e0c2b380SFred Isaman EXPORT_SYMBOL_GPL(nfs_retry_commit); 158164bfeb49SFred Isaman 15829ace33cdSFred Isaman /* 15831da177e4SLinus Torvalds * Commit dirty pages 15841da177e4SLinus Torvalds */ 15851da177e4SLinus Torvalds static int 1586ea2cf228SFred Isaman nfs_commit_list(struct inode *inode, struct list_head *head, int how, 1587ea2cf228SFred Isaman struct nfs_commit_info *cinfo) 15881da177e4SLinus Torvalds { 15890b7c0153SFred Isaman struct nfs_commit_data *data; 15901da177e4SLinus Torvalds 1591c9d8f89dSTrond Myklebust data = nfs_commitdata_alloc(); 15921da177e4SLinus Torvalds 15931da177e4SLinus Torvalds if (!data) 15941da177e4SLinus Torvalds goto out_bad; 15951da177e4SLinus Torvalds 15961da177e4SLinus Torvalds /* Set up the argument struct */ 1597f453a54aSFred Isaman nfs_init_commit(data, head, NULL, cinfo); 1598f453a54aSFred Isaman atomic_inc(&cinfo->mds->rpcs_out); 15999f0ec176SAndy Adamson return nfs_initiate_commit(NFS_CLIENT(inode), data, data->mds_ops, 16009f0ec176SAndy Adamson how, 0); 16011da177e4SLinus Torvalds out_bad: 1602ea2cf228SFred Isaman nfs_retry_commit(head, NULL, cinfo); 1603f453a54aSFred Isaman cinfo->completion_ops->error_cleanup(NFS_I(inode)); 16041da177e4SLinus Torvalds return -ENOMEM; 16051da177e4SLinus Torvalds } 16061da177e4SLinus Torvalds 16071da177e4SLinus Torvalds /* 16081da177e4SLinus Torvalds * COMMIT call returned 16091da177e4SLinus Torvalds */ 1610788e7a89STrond Myklebust static void nfs_commit_done(struct rpc_task *task, void *calldata) 16111da177e4SLinus Torvalds { 16120b7c0153SFred Isaman struct nfs_commit_data *data = calldata; 16131da177e4SLinus Torvalds 1614a3f565b1SChuck Lever dprintk("NFS: %5u nfs_commit_done (status %d)\n", 16151da177e4SLinus Torvalds task->tk_pid, task->tk_status); 16161da177e4SLinus Torvalds 1617788e7a89STrond Myklebust /* Call the NFS version-specific code */ 1618c0d0e96bSTrond Myklebust NFS_PROTO(data->inode)->commit_done(task, data); 1619c9d8f89dSTrond Myklebust } 1620c9d8f89dSTrond Myklebust 1621f453a54aSFred Isaman static void nfs_commit_release_pages(struct nfs_commit_data *data) 1622c9d8f89dSTrond Myklebust { 1623c9d8f89dSTrond Myklebust struct nfs_page *req; 1624c9d8f89dSTrond Myklebust int status = data->task.tk_status; 1625f453a54aSFred Isaman struct nfs_commit_info cinfo; 1626788e7a89STrond Myklebust 16271da177e4SLinus Torvalds while (!list_empty(&data->pages)) { 16281da177e4SLinus Torvalds req = nfs_list_entry(data->pages.next); 16291da177e4SLinus Torvalds nfs_list_remove_request(req); 1630d6d6dc7cSFred Isaman nfs_clear_page_commit(req->wb_page); 16311da177e4SLinus Torvalds 16321e8968c5SNiels de Vos dprintk("NFS: commit (%s/%llu %d@%lld)", 16333d4ff43dSAl Viro req->wb_context->dentry->d_sb->s_id, 16341e8968c5SNiels de Vos (unsigned long long)NFS_FILEID(req->wb_context->dentry->d_inode), 16351da177e4SLinus Torvalds req->wb_bytes, 16361da177e4SLinus Torvalds (long long)req_offset(req)); 1637c9d8f89dSTrond Myklebust if (status < 0) { 1638c9d8f89dSTrond Myklebust nfs_context_set_write_error(req->wb_context, status); 16391da177e4SLinus Torvalds nfs_inode_remove_request(req); 1640c9d8f89dSTrond Myklebust dprintk(", error = %d\n", status); 16411da177e4SLinus Torvalds goto next; 16421da177e4SLinus Torvalds } 16431da177e4SLinus Torvalds 16441da177e4SLinus Torvalds /* Okay, COMMIT succeeded, apparently. Check the verifier 16451da177e4SLinus Torvalds * returned by the server against all stored verfs. */ 16462f2c63bcSTrond Myklebust if (!memcmp(&req->wb_verf, &data->verf.verifier, sizeof(req->wb_verf))) { 16471da177e4SLinus Torvalds /* We have a match */ 16481da177e4SLinus Torvalds nfs_inode_remove_request(req); 16491da177e4SLinus Torvalds dprintk(" OK\n"); 16501da177e4SLinus Torvalds goto next; 16511da177e4SLinus Torvalds } 16521da177e4SLinus Torvalds /* We have a mismatch. Write the page again */ 16531da177e4SLinus Torvalds dprintk(" mismatch\n"); 16546d884e8fSFred nfs_mark_request_dirty(req); 165505990d1bSTrond Myklebust set_bit(NFS_CONTEXT_RESEND_WRITES, &req->wb_context->flags); 16561da177e4SLinus Torvalds next: 16571d1afcbcSTrond Myklebust nfs_unlock_and_release_request(req); 16581da177e4SLinus Torvalds } 1659f453a54aSFred Isaman nfs_init_cinfo(&cinfo, data->inode, data->dreq); 1660f453a54aSFred Isaman if (atomic_dec_and_test(&cinfo.mds->rpcs_out)) 1661f453a54aSFred Isaman nfs_commit_clear_lock(NFS_I(data->inode)); 16625917ce84SFred Isaman } 16635917ce84SFred Isaman 16645917ce84SFred Isaman static void nfs_commit_release(void *calldata) 16655917ce84SFred Isaman { 16660b7c0153SFred Isaman struct nfs_commit_data *data = calldata; 16675917ce84SFred Isaman 1668f453a54aSFred Isaman data->completion_ops->completion(data); 1669c9d8f89dSTrond Myklebust nfs_commitdata_release(calldata); 16701da177e4SLinus Torvalds } 1671788e7a89STrond Myklebust 1672788e7a89STrond Myklebust static const struct rpc_call_ops nfs_commit_ops = { 16730b7c0153SFred Isaman .rpc_call_prepare = nfs_commit_prepare, 1674788e7a89STrond Myklebust .rpc_call_done = nfs_commit_done, 1675788e7a89STrond Myklebust .rpc_release = nfs_commit_release, 1676788e7a89STrond Myklebust }; 16771da177e4SLinus Torvalds 1678f453a54aSFred Isaman static const struct nfs_commit_completion_ops nfs_commit_completion_ops = { 1679f453a54aSFred Isaman .completion = nfs_commit_release_pages, 1680f453a54aSFred Isaman .error_cleanup = nfs_commit_clear_lock, 1681f453a54aSFred Isaman }; 1682f453a54aSFred Isaman 16831763da12SFred Isaman int nfs_generic_commit_list(struct inode *inode, struct list_head *head, 1684ea2cf228SFred Isaman int how, struct nfs_commit_info *cinfo) 168584c53ab5SFred Isaman { 168684c53ab5SFred Isaman int status; 168784c53ab5SFred Isaman 1688ea2cf228SFred Isaman status = pnfs_commit_list(inode, head, how, cinfo); 168984c53ab5SFred Isaman if (status == PNFS_NOT_ATTEMPTED) 1690ea2cf228SFred Isaman status = nfs_commit_list(inode, head, how, cinfo); 169184c53ab5SFred Isaman return status; 169284c53ab5SFred Isaman } 169384c53ab5SFred Isaman 1694b608b283STrond Myklebust int nfs_commit_inode(struct inode *inode, int how) 16951da177e4SLinus Torvalds { 16961da177e4SLinus Torvalds LIST_HEAD(head); 1697ea2cf228SFred Isaman struct nfs_commit_info cinfo; 169871d0a611STrond Myklebust int may_wait = how & FLUSH_SYNC; 1699b8413f98STrond Myklebust int res; 17001da177e4SLinus Torvalds 1701b8413f98STrond Myklebust res = nfs_commit_set_lock(NFS_I(inode), may_wait); 1702b8413f98STrond Myklebust if (res <= 0) 1703c5efa5fcSTrond Myklebust goto out_mark_dirty; 1704ea2cf228SFred Isaman nfs_init_cinfo_from_inode(&cinfo, inode); 1705ea2cf228SFred Isaman res = nfs_scan_commit(inode, &head, &cinfo); 17061da177e4SLinus Torvalds if (res) { 1707a861a1e1SFred Isaman int error; 1708a861a1e1SFred Isaman 1709ea2cf228SFred Isaman error = nfs_generic_commit_list(inode, &head, how, &cinfo); 17101da177e4SLinus Torvalds if (error < 0) 17111da177e4SLinus Torvalds return error; 1712b8413f98STrond Myklebust if (!may_wait) 1713b8413f98STrond Myklebust goto out_mark_dirty; 171474316201SNeilBrown error = wait_on_bit_action(&NFS_I(inode)->flags, 1715b8413f98STrond Myklebust NFS_INO_COMMIT, 171671d0a611STrond Myklebust nfs_wait_bit_killable, 171771d0a611STrond Myklebust TASK_KILLABLE); 1718b8413f98STrond Myklebust if (error < 0) 1719b8413f98STrond Myklebust return error; 172071d0a611STrond Myklebust } else 172171d0a611STrond Myklebust nfs_commit_clear_lock(NFS_I(inode)); 1722c5efa5fcSTrond Myklebust return res; 1723c5efa5fcSTrond Myklebust /* Note: If we exit without ensuring that the commit is complete, 1724c5efa5fcSTrond Myklebust * we must mark the inode as dirty. Otherwise, future calls to 1725c5efa5fcSTrond Myklebust * sync_inode() with the WB_SYNC_ALL flag set will fail to ensure 1726c5efa5fcSTrond Myklebust * that the data is on the disk. 1727c5efa5fcSTrond Myklebust */ 1728c5efa5fcSTrond Myklebust out_mark_dirty: 1729c5efa5fcSTrond Myklebust __mark_inode_dirty(inode, I_DIRTY_DATASYNC); 17301da177e4SLinus Torvalds return res; 17311da177e4SLinus Torvalds } 17328fc795f7STrond Myklebust 17338fc795f7STrond Myklebust static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_control *wbc) 17348fc795f7STrond Myklebust { 1735420e3646STrond Myklebust struct nfs_inode *nfsi = NFS_I(inode); 1736420e3646STrond Myklebust int flags = FLUSH_SYNC; 1737420e3646STrond Myklebust int ret = 0; 17388fc795f7STrond Myklebust 17393236c3e1SJeff Layton /* no commits means nothing needs to be done */ 1740ea2cf228SFred Isaman if (!nfsi->commit_info.ncommit) 17413236c3e1SJeff Layton return ret; 17423236c3e1SJeff Layton 1743a00dd6c0SJeff Layton if (wbc->sync_mode == WB_SYNC_NONE) { 1744a00dd6c0SJeff Layton /* Don't commit yet if this is a non-blocking flush and there 1745a00dd6c0SJeff Layton * are a lot of outstanding writes for this mapping. 1746420e3646STrond Myklebust */ 1747ea2cf228SFred Isaman if (nfsi->commit_info.ncommit <= (nfsi->npages >> 1)) 1748420e3646STrond Myklebust goto out_mark_dirty; 1749420e3646STrond Myklebust 1750a00dd6c0SJeff Layton /* don't wait for the COMMIT response */ 1751420e3646STrond Myklebust flags = 0; 1752a00dd6c0SJeff Layton } 1753a00dd6c0SJeff Layton 1754420e3646STrond Myklebust ret = nfs_commit_inode(inode, flags); 1755420e3646STrond Myklebust if (ret >= 0) { 1756420e3646STrond Myklebust if (wbc->sync_mode == WB_SYNC_NONE) { 1757420e3646STrond Myklebust if (ret < wbc->nr_to_write) 1758420e3646STrond Myklebust wbc->nr_to_write -= ret; 1759420e3646STrond Myklebust else 1760420e3646STrond Myklebust wbc->nr_to_write = 0; 1761420e3646STrond Myklebust } 17628fc795f7STrond Myklebust return 0; 1763420e3646STrond Myklebust } 1764420e3646STrond Myklebust out_mark_dirty: 17658fc795f7STrond Myklebust __mark_inode_dirty(inode, I_DIRTY_DATASYNC); 17668fc795f7STrond Myklebust return ret; 17678fc795f7STrond Myklebust } 1768c63c7b05STrond Myklebust #else 17698fc795f7STrond Myklebust static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_control *wbc) 17708fc795f7STrond Myklebust { 17718fc795f7STrond Myklebust return 0; 17728fc795f7STrond Myklebust } 17731da177e4SLinus Torvalds #endif 17741da177e4SLinus Torvalds 17758fc795f7STrond Myklebust int nfs_write_inode(struct inode *inode, struct writeback_control *wbc) 17768fc795f7STrond Myklebust { 1777a8d8f02cSBryan Schumaker return nfs_commit_unstable_pages(inode, wbc); 1778a8d8f02cSBryan Schumaker } 177989d77c8fSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_write_inode); 1780863a3c6cSAndy Adamson 1781acdc53b2STrond Myklebust /* 1782acdc53b2STrond Myklebust * flush the inode to disk. 1783acdc53b2STrond Myklebust */ 1784acdc53b2STrond Myklebust int nfs_wb_all(struct inode *inode) 178534901f70STrond Myklebust { 178634901f70STrond Myklebust struct writeback_control wbc = { 178772cb77f4STrond Myklebust .sync_mode = WB_SYNC_ALL, 178834901f70STrond Myklebust .nr_to_write = LONG_MAX, 1789d7fb1207STrond Myklebust .range_start = 0, 1790d7fb1207STrond Myklebust .range_end = LLONG_MAX, 179134901f70STrond Myklebust }; 1792f4ce1299STrond Myklebust int ret; 179334901f70STrond Myklebust 1794f4ce1299STrond Myklebust trace_nfs_writeback_inode_enter(inode); 1795f4ce1299STrond Myklebust 1796f4ce1299STrond Myklebust ret = sync_inode(inode, &wbc); 1797f4ce1299STrond Myklebust 1798f4ce1299STrond Myklebust trace_nfs_writeback_inode_exit(inode, ret); 1799f4ce1299STrond Myklebust return ret; 18001c75950bSTrond Myklebust } 1801ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_wb_all); 18021c75950bSTrond Myklebust 18031b3b4a1aSTrond Myklebust int nfs_wb_page_cancel(struct inode *inode, struct page *page) 18041b3b4a1aSTrond Myklebust { 18051b3b4a1aSTrond Myklebust struct nfs_page *req; 18061b3b4a1aSTrond Myklebust int ret = 0; 18071b3b4a1aSTrond Myklebust 1808ba8b06e6STrond Myklebust wait_on_page_writeback(page); 18093e217045SWeston Andros Adamson 18103e217045SWeston Andros Adamson /* blocking call to cancel all requests and join to a single (head) 18113e217045SWeston Andros Adamson * request */ 18123e217045SWeston Andros Adamson req = nfs_lock_and_join_requests(page, false); 18133e217045SWeston Andros Adamson 18143e217045SWeston Andros Adamson if (IS_ERR(req)) { 18153e217045SWeston Andros Adamson ret = PTR_ERR(req); 18163e217045SWeston Andros Adamson } else if (req) { 18173e217045SWeston Andros Adamson /* all requests from this page have been cancelled by 18183e217045SWeston Andros Adamson * nfs_lock_and_join_requests, so just remove the head 18193e217045SWeston Andros Adamson * request from the inode / page_private pointer and 18203e217045SWeston Andros Adamson * release it */ 18211b3b4a1aSTrond Myklebust nfs_inode_remove_request(req); 18221b3b4a1aSTrond Myklebust /* 18231b3b4a1aSTrond Myklebust * In case nfs_inode_remove_request has marked the 18241b3b4a1aSTrond Myklebust * page as being dirty 18251b3b4a1aSTrond Myklebust */ 18261b3b4a1aSTrond Myklebust cancel_dirty_page(page, PAGE_CACHE_SIZE); 18271d1afcbcSTrond Myklebust nfs_unlock_and_release_request(req); 18281b3b4a1aSTrond Myklebust } 18293e217045SWeston Andros Adamson 18301b3b4a1aSTrond Myklebust return ret; 18311b3b4a1aSTrond Myklebust } 18321b3b4a1aSTrond Myklebust 18331c75950bSTrond Myklebust /* 18341c75950bSTrond Myklebust * Write back all requests on one page - we do this before reading it. 18351c75950bSTrond Myklebust */ 18361c75950bSTrond Myklebust int nfs_wb_page(struct inode *inode, struct page *page) 18371c75950bSTrond Myklebust { 183829418aa4SMel Gorman loff_t range_start = page_file_offset(page); 18397f2f12d9STrond Myklebust loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); 18407f2f12d9STrond Myklebust struct writeback_control wbc = { 18417f2f12d9STrond Myklebust .sync_mode = WB_SYNC_ALL, 18427f2f12d9STrond Myklebust .nr_to_write = 0, 18437f2f12d9STrond Myklebust .range_start = range_start, 18447f2f12d9STrond Myklebust .range_end = range_end, 18457f2f12d9STrond Myklebust }; 18467f2f12d9STrond Myklebust int ret; 18477f2f12d9STrond Myklebust 1848f4ce1299STrond Myklebust trace_nfs_writeback_page_enter(inode); 1849f4ce1299STrond Myklebust 18500522f6adSTrond Myklebust for (;;) { 1851ba8b06e6STrond Myklebust wait_on_page_writeback(page); 18527f2f12d9STrond Myklebust if (clear_page_dirty_for_io(page)) { 18537f2f12d9STrond Myklebust ret = nfs_writepage_locked(page, &wbc); 18547f2f12d9STrond Myklebust if (ret < 0) 18557f2f12d9STrond Myklebust goto out_error; 18560522f6adSTrond Myklebust continue; 18577f2f12d9STrond Myklebust } 1858f4ce1299STrond Myklebust ret = 0; 18590522f6adSTrond Myklebust if (!PagePrivate(page)) 18600522f6adSTrond Myklebust break; 18610522f6adSTrond Myklebust ret = nfs_commit_inode(inode, FLUSH_SYNC); 18627f2f12d9STrond Myklebust if (ret < 0) 18637f2f12d9STrond Myklebust goto out_error; 18647f2f12d9STrond Myklebust } 18657f2f12d9STrond Myklebust out_error: 1866f4ce1299STrond Myklebust trace_nfs_writeback_page_exit(inode, ret); 18677f2f12d9STrond Myklebust return ret; 18681c75950bSTrond Myklebust } 18691c75950bSTrond Myklebust 1870074cc1deSTrond Myklebust #ifdef CONFIG_MIGRATION 1871074cc1deSTrond Myklebust int nfs_migrate_page(struct address_space *mapping, struct page *newpage, 1872a6bc32b8SMel Gorman struct page *page, enum migrate_mode mode) 1873074cc1deSTrond Myklebust { 18742da95652SJeff Layton /* 18752da95652SJeff Layton * If PagePrivate is set, then the page is currently associated with 18762da95652SJeff Layton * an in-progress read or write request. Don't try to migrate it. 18772da95652SJeff Layton * 18782da95652SJeff Layton * FIXME: we could do this in principle, but we'll need a way to ensure 18792da95652SJeff Layton * that we can safely release the inode reference while holding 18802da95652SJeff Layton * the page lock. 18812da95652SJeff Layton */ 18822da95652SJeff Layton if (PagePrivate(page)) 18832da95652SJeff Layton return -EBUSY; 1884074cc1deSTrond Myklebust 18858c209ce7SDavid Howells if (!nfs_fscache_release_page(page, GFP_KERNEL)) 18868c209ce7SDavid Howells return -EBUSY; 1887074cc1deSTrond Myklebust 1888a6bc32b8SMel Gorman return migrate_page(mapping, newpage, page, mode); 1889074cc1deSTrond Myklebust } 1890074cc1deSTrond Myklebust #endif 1891074cc1deSTrond Myklebust 1892f7b422b1SDavid Howells int __init nfs_init_writepagecache(void) 18931da177e4SLinus Torvalds { 18941da177e4SLinus Torvalds nfs_wdata_cachep = kmem_cache_create("nfs_write_data", 18951e7f3a48SWeston Andros Adamson sizeof(struct nfs_pgio_header), 18961da177e4SLinus Torvalds 0, SLAB_HWCACHE_ALIGN, 189720c2df83SPaul Mundt NULL); 18981da177e4SLinus Torvalds if (nfs_wdata_cachep == NULL) 18991da177e4SLinus Torvalds return -ENOMEM; 19001da177e4SLinus Torvalds 190193d2341cSMatthew Dobson nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE, 19021da177e4SLinus Torvalds nfs_wdata_cachep); 19031da177e4SLinus Torvalds if (nfs_wdata_mempool == NULL) 19043dd4765fSJeff Layton goto out_destroy_write_cache; 19051da177e4SLinus Torvalds 19060b7c0153SFred Isaman nfs_cdata_cachep = kmem_cache_create("nfs_commit_data", 19070b7c0153SFred Isaman sizeof(struct nfs_commit_data), 19080b7c0153SFred Isaman 0, SLAB_HWCACHE_ALIGN, 19090b7c0153SFred Isaman NULL); 19100b7c0153SFred Isaman if (nfs_cdata_cachep == NULL) 19113dd4765fSJeff Layton goto out_destroy_write_mempool; 19120b7c0153SFred Isaman 191393d2341cSMatthew Dobson nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT, 19144c100210SYanchuan Nian nfs_cdata_cachep); 19151da177e4SLinus Torvalds if (nfs_commit_mempool == NULL) 19163dd4765fSJeff Layton goto out_destroy_commit_cache; 19171da177e4SLinus Torvalds 191889a09141SPeter Zijlstra /* 191989a09141SPeter Zijlstra * NFS congestion size, scale with available memory. 192089a09141SPeter Zijlstra * 192189a09141SPeter Zijlstra * 64MB: 8192k 192289a09141SPeter Zijlstra * 128MB: 11585k 192389a09141SPeter Zijlstra * 256MB: 16384k 192489a09141SPeter Zijlstra * 512MB: 23170k 192589a09141SPeter Zijlstra * 1GB: 32768k 192689a09141SPeter Zijlstra * 2GB: 46340k 192789a09141SPeter Zijlstra * 4GB: 65536k 192889a09141SPeter Zijlstra * 8GB: 92681k 192989a09141SPeter Zijlstra * 16GB: 131072k 193089a09141SPeter Zijlstra * 193189a09141SPeter Zijlstra * This allows larger machines to have larger/more transfers. 193289a09141SPeter Zijlstra * Limit the default to 256M 193389a09141SPeter Zijlstra */ 193489a09141SPeter Zijlstra nfs_congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); 193589a09141SPeter Zijlstra if (nfs_congestion_kb > 256*1024) 193689a09141SPeter Zijlstra nfs_congestion_kb = 256*1024; 193789a09141SPeter Zijlstra 19381da177e4SLinus Torvalds return 0; 19393dd4765fSJeff Layton 19403dd4765fSJeff Layton out_destroy_commit_cache: 19413dd4765fSJeff Layton kmem_cache_destroy(nfs_cdata_cachep); 19423dd4765fSJeff Layton out_destroy_write_mempool: 19433dd4765fSJeff Layton mempool_destroy(nfs_wdata_mempool); 19443dd4765fSJeff Layton out_destroy_write_cache: 19453dd4765fSJeff Layton kmem_cache_destroy(nfs_wdata_cachep); 19463dd4765fSJeff Layton return -ENOMEM; 19471da177e4SLinus Torvalds } 19481da177e4SLinus Torvalds 1949266bee88SDavid Brownell void nfs_destroy_writepagecache(void) 19501da177e4SLinus Torvalds { 19511da177e4SLinus Torvalds mempool_destroy(nfs_commit_mempool); 19523dd4765fSJeff Layton kmem_cache_destroy(nfs_cdata_cachep); 19531da177e4SLinus Torvalds mempool_destroy(nfs_wdata_mempool); 19541a1d92c1SAlexey Dobriyan kmem_cache_destroy(nfs_wdata_cachep); 19551da177e4SLinus Torvalds } 19561da177e4SLinus Torvalds 19574a0de55cSAnna Schumaker static const struct nfs_rw_ops nfs_rw_write_ops = { 1958a4cdda59SAnna Schumaker .rw_mode = FMODE_WRITE, 19594a0de55cSAnna Schumaker .rw_alloc_header = nfs_writehdr_alloc, 19604a0de55cSAnna Schumaker .rw_free_header = nfs_writehdr_free, 1961a4cdda59SAnna Schumaker .rw_release = nfs_writeback_release_common, 19620eecb214SAnna Schumaker .rw_done = nfs_writeback_done, 19630eecb214SAnna Schumaker .rw_result = nfs_writeback_result, 19641ed26f33SAnna Schumaker .rw_initiate = nfs_initiate_write, 19654a0de55cSAnna Schumaker }; 1966