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> 161da177e4SLinus Torvalds 171da177e4SLinus Torvalds #include <linux/sunrpc/clnt.h> 181da177e4SLinus Torvalds #include <linux/nfs_fs.h> 191da177e4SLinus Torvalds #include <linux/nfs_mount.h> 201da177e4SLinus Torvalds #include <linux/nfs_page.h> 213fcfab16SAndrew Morton #include <linux/backing-dev.h> 223fcfab16SAndrew Morton 231da177e4SLinus Torvalds #include <asm/uaccess.h> 241da177e4SLinus Torvalds 251da177e4SLinus Torvalds #include "delegation.h" 2649a70f27STrond Myklebust #include "internal.h" 2791d5b470SChuck Lever #include "iostat.h" 281da177e4SLinus Torvalds 291da177e4SLinus Torvalds #define NFSDBG_FACILITY NFSDBG_PAGECACHE 301da177e4SLinus Torvalds 311da177e4SLinus Torvalds #define MIN_POOL_WRITE (32) 321da177e4SLinus Torvalds #define MIN_POOL_COMMIT (4) 331da177e4SLinus Torvalds 341da177e4SLinus Torvalds /* 351da177e4SLinus Torvalds * Local function declarations 361da177e4SLinus Torvalds */ 371da177e4SLinus Torvalds static struct nfs_page * nfs_update_request(struct nfs_open_context*, 381da177e4SLinus Torvalds struct page *, 391da177e4SLinus Torvalds unsigned int, unsigned int); 40c63c7b05STrond Myklebust static void nfs_pageio_init_write(struct nfs_pageio_descriptor *desc, 41c63c7b05STrond Myklebust struct inode *inode, int ioflags); 42788e7a89STrond Myklebust static const struct rpc_call_ops nfs_write_partial_ops; 43788e7a89STrond Myklebust static const struct rpc_call_ops nfs_write_full_ops; 44788e7a89STrond Myklebust static const struct rpc_call_ops nfs_commit_ops; 451da177e4SLinus Torvalds 46e18b890bSChristoph Lameter static struct kmem_cache *nfs_wdata_cachep; 473feb2d49STrond Myklebust static mempool_t *nfs_wdata_mempool; 481da177e4SLinus Torvalds static mempool_t *nfs_commit_mempool; 491da177e4SLinus Torvalds 50e9f7bee1STrond Myklebust struct nfs_write_data *nfs_commit_alloc(void) 511da177e4SLinus Torvalds { 52e6b4f8daSChristoph Lameter struct nfs_write_data *p = mempool_alloc(nfs_commit_mempool, GFP_NOFS); 5340859d7eSChuck Lever 541da177e4SLinus Torvalds if (p) { 551da177e4SLinus Torvalds memset(p, 0, sizeof(*p)); 561da177e4SLinus Torvalds INIT_LIST_HEAD(&p->pages); 571da177e4SLinus Torvalds } 581da177e4SLinus Torvalds return p; 591da177e4SLinus Torvalds } 601da177e4SLinus Torvalds 6110afec90STrond Myklebust static void nfs_commit_rcu_free(struct rcu_head *head) 621da177e4SLinus Torvalds { 638aca67f0STrond Myklebust struct nfs_write_data *p = container_of(head, struct nfs_write_data, task.u.tk_rcu); 6440859d7eSChuck Lever if (p && (p->pagevec != &p->page_array[0])) 6540859d7eSChuck Lever kfree(p->pagevec); 661da177e4SLinus Torvalds mempool_free(p, nfs_commit_mempool); 671da177e4SLinus Torvalds } 681da177e4SLinus Torvalds 698aca67f0STrond Myklebust void nfs_commit_free(struct nfs_write_data *wdata) 708aca67f0STrond Myklebust { 718aca67f0STrond Myklebust call_rcu_bh(&wdata->task.u.tk_rcu, nfs_commit_rcu_free); 728aca67f0STrond Myklebust } 738aca67f0STrond Myklebust 748d5658c9STrond Myklebust struct nfs_write_data *nfs_writedata_alloc(unsigned int pagecount) 753feb2d49STrond Myklebust { 76e6b4f8daSChristoph Lameter struct nfs_write_data *p = mempool_alloc(nfs_wdata_mempool, GFP_NOFS); 773feb2d49STrond Myklebust 783feb2d49STrond Myklebust if (p) { 793feb2d49STrond Myklebust memset(p, 0, sizeof(*p)); 803feb2d49STrond Myklebust INIT_LIST_HEAD(&p->pages); 81e9f7bee1STrond Myklebust p->npages = pagecount; 820d0b5cb3SChuck Lever if (pagecount <= ARRAY_SIZE(p->page_array)) 830d0b5cb3SChuck Lever p->pagevec = p->page_array; 843feb2d49STrond Myklebust else { 850d0b5cb3SChuck Lever p->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_NOFS); 860d0b5cb3SChuck Lever if (!p->pagevec) { 873feb2d49STrond Myklebust mempool_free(p, nfs_wdata_mempool); 883feb2d49STrond Myklebust p = NULL; 893feb2d49STrond Myklebust } 903feb2d49STrond Myklebust } 913feb2d49STrond Myklebust } 923feb2d49STrond Myklebust return p; 933feb2d49STrond Myklebust } 943feb2d49STrond Myklebust 958aca67f0STrond Myklebust static void nfs_writedata_rcu_free(struct rcu_head *head) 963feb2d49STrond Myklebust { 978aca67f0STrond Myklebust struct nfs_write_data *p = container_of(head, struct nfs_write_data, task.u.tk_rcu); 983feb2d49STrond Myklebust if (p && (p->pagevec != &p->page_array[0])) 993feb2d49STrond Myklebust kfree(p->pagevec); 1003feb2d49STrond Myklebust mempool_free(p, nfs_wdata_mempool); 1013feb2d49STrond Myklebust } 1023feb2d49STrond Myklebust 1038aca67f0STrond Myklebust static void nfs_writedata_free(struct nfs_write_data *wdata) 1048aca67f0STrond Myklebust { 1058aca67f0STrond Myklebust call_rcu_bh(&wdata->task.u.tk_rcu, nfs_writedata_rcu_free); 1068aca67f0STrond Myklebust } 1078aca67f0STrond Myklebust 108963d8fe5STrond Myklebust void nfs_writedata_release(void *wdata) 1091da177e4SLinus Torvalds { 1101da177e4SLinus Torvalds nfs_writedata_free(wdata); 1111da177e4SLinus Torvalds } 1121da177e4SLinus Torvalds 1137b159fc1STrond Myklebust static void nfs_context_set_write_error(struct nfs_open_context *ctx, int error) 1147b159fc1STrond Myklebust { 1157b159fc1STrond Myklebust ctx->error = error; 1167b159fc1STrond Myklebust smp_wmb(); 1177b159fc1STrond Myklebust set_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); 1187b159fc1STrond Myklebust } 1197b159fc1STrond Myklebust 120277459d2STrond Myklebust static struct nfs_page *nfs_page_find_request_locked(struct page *page) 121277459d2STrond Myklebust { 122277459d2STrond Myklebust struct nfs_page *req = NULL; 123277459d2STrond Myklebust 124277459d2STrond Myklebust if (PagePrivate(page)) { 125277459d2STrond Myklebust req = (struct nfs_page *)page_private(page); 126277459d2STrond Myklebust if (req != NULL) 127c03b4024STrond Myklebust kref_get(&req->wb_kref); 128277459d2STrond Myklebust } 129277459d2STrond Myklebust return req; 130277459d2STrond Myklebust } 131277459d2STrond Myklebust 132277459d2STrond Myklebust static struct nfs_page *nfs_page_find_request(struct page *page) 133277459d2STrond Myklebust { 134587142f8STrond Myklebust struct inode *inode = page->mapping->host; 135277459d2STrond Myklebust struct nfs_page *req = NULL; 136277459d2STrond Myklebust 137587142f8STrond Myklebust spin_lock(&inode->i_lock); 138277459d2STrond Myklebust req = nfs_page_find_request_locked(page); 139587142f8STrond Myklebust spin_unlock(&inode->i_lock); 140277459d2STrond Myklebust return req; 141277459d2STrond Myklebust } 142277459d2STrond Myklebust 1431da177e4SLinus Torvalds /* Adjust the file length if we're writing beyond the end */ 1441da177e4SLinus Torvalds static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int count) 1451da177e4SLinus Torvalds { 1461da177e4SLinus Torvalds struct inode *inode = page->mapping->host; 1471da177e4SLinus Torvalds loff_t end, i_size = i_size_read(inode); 148ca52fec1STrond Myklebust pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; 1491da177e4SLinus Torvalds 1501da177e4SLinus Torvalds if (i_size > 0 && page->index < end_index) 1511da177e4SLinus Torvalds return; 1521da177e4SLinus Torvalds end = ((loff_t)page->index << PAGE_CACHE_SHIFT) + ((loff_t)offset+count); 1531da177e4SLinus Torvalds if (i_size >= end) 1541da177e4SLinus Torvalds return; 15591d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_EXTENDWRITE); 1561da177e4SLinus Torvalds i_size_write(inode, end); 1571da177e4SLinus Torvalds } 1581da177e4SLinus Torvalds 159a301b777STrond Myklebust /* A writeback failed: mark the page as bad, and invalidate the page cache */ 160a301b777STrond Myklebust static void nfs_set_pageerror(struct page *page) 161a301b777STrond Myklebust { 162a301b777STrond Myklebust SetPageError(page); 163a301b777STrond Myklebust nfs_zap_mapping(page->mapping->host, page->mapping); 164a301b777STrond Myklebust } 165a301b777STrond Myklebust 1661da177e4SLinus Torvalds /* We can set the PG_uptodate flag if we see that a write request 1671da177e4SLinus Torvalds * covers the full page. 1681da177e4SLinus Torvalds */ 1691da177e4SLinus Torvalds static void nfs_mark_uptodate(struct page *page, unsigned int base, unsigned int count) 1701da177e4SLinus Torvalds { 1711da177e4SLinus Torvalds if (PageUptodate(page)) 1721da177e4SLinus Torvalds return; 1731da177e4SLinus Torvalds if (base != 0) 1741da177e4SLinus Torvalds return; 17549a70f27STrond Myklebust if (count != nfs_page_length(page)) 1761da177e4SLinus Torvalds return; 1771da177e4SLinus Torvalds SetPageUptodate(page); 1781da177e4SLinus Torvalds } 1791da177e4SLinus Torvalds 180e21195a7STrond Myklebust static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page, 1811da177e4SLinus Torvalds unsigned int offset, unsigned int count) 1821da177e4SLinus Torvalds { 1831da177e4SLinus Torvalds struct nfs_page *req; 184e21195a7STrond Myklebust int ret; 1851da177e4SLinus Torvalds 186e21195a7STrond Myklebust for (;;) { 187e21195a7STrond Myklebust req = nfs_update_request(ctx, page, offset, count); 188e21195a7STrond Myklebust if (!IS_ERR(req)) 189e21195a7STrond Myklebust break; 190e21195a7STrond Myklebust ret = PTR_ERR(req); 191e21195a7STrond Myklebust if (ret != -EBUSY) 192e21195a7STrond Myklebust return ret; 193e21195a7STrond Myklebust ret = nfs_wb_page(page->mapping->host, page); 194e21195a7STrond Myklebust if (ret != 0) 195e21195a7STrond Myklebust return ret; 196e21195a7STrond Myklebust } 1971da177e4SLinus Torvalds /* Update file length */ 1981da177e4SLinus Torvalds nfs_grow_file(page, offset, count); 199acee478aSTrond Myklebust nfs_clear_page_tag_locked(req); 200abd3e641STrond Myklebust return 0; 2011da177e4SLinus Torvalds } 2021da177e4SLinus Torvalds 2031da177e4SLinus Torvalds static int wb_priority(struct writeback_control *wbc) 2041da177e4SLinus Torvalds { 2051da177e4SLinus Torvalds if (wbc->for_reclaim) 206c63c7b05STrond Myklebust return FLUSH_HIGHPRI | FLUSH_STABLE; 2071da177e4SLinus Torvalds if (wbc->for_kupdate) 2081da177e4SLinus Torvalds return FLUSH_LOWPRI; 2091da177e4SLinus Torvalds return 0; 2101da177e4SLinus Torvalds } 2111da177e4SLinus Torvalds 2121da177e4SLinus Torvalds /* 21389a09141SPeter Zijlstra * NFS congestion control 21489a09141SPeter Zijlstra */ 21589a09141SPeter Zijlstra 21689a09141SPeter Zijlstra int nfs_congestion_kb; 21789a09141SPeter Zijlstra 21889a09141SPeter Zijlstra #define NFS_CONGESTION_ON_THRESH (nfs_congestion_kb >> (PAGE_SHIFT-10)) 21989a09141SPeter Zijlstra #define NFS_CONGESTION_OFF_THRESH \ 22089a09141SPeter Zijlstra (NFS_CONGESTION_ON_THRESH - (NFS_CONGESTION_ON_THRESH >> 2)) 22189a09141SPeter Zijlstra 2225a6d41b3STrond Myklebust static int nfs_set_page_writeback(struct page *page) 22389a09141SPeter Zijlstra { 2245a6d41b3STrond Myklebust int ret = test_set_page_writeback(page); 2255a6d41b3STrond Myklebust 2265a6d41b3STrond Myklebust if (!ret) { 22789a09141SPeter Zijlstra struct inode *inode = page->mapping->host; 22889a09141SPeter Zijlstra struct nfs_server *nfss = NFS_SERVER(inode); 22989a09141SPeter Zijlstra 230277866a0SPeter Zijlstra if (atomic_long_inc_return(&nfss->writeback) > 23189a09141SPeter Zijlstra NFS_CONGESTION_ON_THRESH) 23289a09141SPeter Zijlstra set_bdi_congested(&nfss->backing_dev_info, WRITE); 23389a09141SPeter Zijlstra } 2345a6d41b3STrond Myklebust return ret; 23589a09141SPeter Zijlstra } 23689a09141SPeter Zijlstra 23789a09141SPeter Zijlstra static void nfs_end_page_writeback(struct page *page) 23889a09141SPeter Zijlstra { 23989a09141SPeter Zijlstra struct inode *inode = page->mapping->host; 24089a09141SPeter Zijlstra struct nfs_server *nfss = NFS_SERVER(inode); 24189a09141SPeter Zijlstra 24289a09141SPeter Zijlstra end_page_writeback(page); 243c4dc4beeSPeter Zijlstra if (atomic_long_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH) 24489a09141SPeter Zijlstra clear_bdi_congested(&nfss->backing_dev_info, WRITE); 24589a09141SPeter Zijlstra } 24689a09141SPeter Zijlstra 24789a09141SPeter Zijlstra /* 248e261f51fSTrond Myklebust * Find an associated nfs write request, and prepare to flush it out 2499cccef95STrond Myklebust * May return an error if the user signalled nfs_wait_on_request(). 250e261f51fSTrond Myklebust */ 251c63c7b05STrond Myklebust static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio, 252c63c7b05STrond Myklebust struct page *page) 253e261f51fSTrond Myklebust { 254587142f8STrond Myklebust struct inode *inode = page->mapping->host; 255e261f51fSTrond Myklebust struct nfs_page *req; 256e261f51fSTrond Myklebust int ret; 257e261f51fSTrond Myklebust 258587142f8STrond Myklebust spin_lock(&inode->i_lock); 259e261f51fSTrond Myklebust for(;;) { 260e261f51fSTrond Myklebust req = nfs_page_find_request_locked(page); 261e261f51fSTrond Myklebust if (req == NULL) { 262587142f8STrond Myklebust spin_unlock(&inode->i_lock); 2639cccef95STrond Myklebust return 0; 264e261f51fSTrond Myklebust } 265acee478aSTrond Myklebust if (nfs_set_page_tag_locked(req)) 266e261f51fSTrond Myklebust break; 267e261f51fSTrond Myklebust /* Note: If we hold the page lock, as is the case in nfs_writepage, 268acee478aSTrond Myklebust * then the call to nfs_set_page_tag_locked() will always 269e261f51fSTrond Myklebust * succeed provided that someone hasn't already marked the 270e261f51fSTrond Myklebust * request as dirty (in which case we don't care). 271e261f51fSTrond Myklebust */ 272587142f8STrond Myklebust spin_unlock(&inode->i_lock); 273e261f51fSTrond Myklebust ret = nfs_wait_on_request(req); 274e261f51fSTrond Myklebust nfs_release_request(req); 275e261f51fSTrond Myklebust if (ret != 0) 276e261f51fSTrond Myklebust return ret; 277587142f8STrond Myklebust spin_lock(&inode->i_lock); 278e261f51fSTrond Myklebust } 279612c9384STrond Myklebust if (test_bit(PG_NEED_COMMIT, &req->wb_flags)) { 280612c9384STrond Myklebust /* This request is marked for commit */ 281587142f8STrond Myklebust spin_unlock(&inode->i_lock); 282acee478aSTrond Myklebust nfs_clear_page_tag_locked(req); 283c63c7b05STrond Myklebust nfs_pageio_complete(pgio); 2849cccef95STrond Myklebust return 0; 285612c9384STrond Myklebust } 286c63c7b05STrond Myklebust if (nfs_set_page_writeback(page) != 0) { 287587142f8STrond Myklebust spin_unlock(&inode->i_lock); 288c63c7b05STrond Myklebust BUG(); 289c63c7b05STrond Myklebust } 290587142f8STrond Myklebust spin_unlock(&inode->i_lock); 291c63c7b05STrond Myklebust nfs_pageio_add_request(pgio, req); 2929cccef95STrond Myklebust return 0; 293e261f51fSTrond Myklebust } 294e261f51fSTrond Myklebust 295f758c885STrond Myklebust static int nfs_do_writepage(struct page *page, struct writeback_control *wbc, struct nfs_pageio_descriptor *pgio) 296f758c885STrond Myklebust { 297f758c885STrond Myklebust struct inode *inode = page->mapping->host; 298f758c885STrond Myklebust 299f758c885STrond Myklebust nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE); 300f758c885STrond Myklebust nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1); 301f758c885STrond Myklebust 302f758c885STrond Myklebust nfs_pageio_cond_complete(pgio, page->index); 303f758c885STrond Myklebust return nfs_page_async_flush(pgio, page); 304f758c885STrond Myklebust } 305f758c885STrond Myklebust 306e261f51fSTrond Myklebust /* 3071da177e4SLinus Torvalds * Write an mmapped page to the server. 3081da177e4SLinus Torvalds */ 3094d770ccfSTrond Myklebust static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc) 3101da177e4SLinus Torvalds { 311f758c885STrond Myklebust struct nfs_pageio_descriptor pgio; 312e261f51fSTrond Myklebust int err; 3131da177e4SLinus Torvalds 314f758c885STrond Myklebust nfs_pageio_init_write(&pgio, page->mapping->host, wb_priority(wbc)); 315f758c885STrond Myklebust err = nfs_do_writepage(page, wbc, &pgio); 316f758c885STrond Myklebust nfs_pageio_complete(&pgio); 317f758c885STrond Myklebust if (err < 0) 3184d770ccfSTrond Myklebust return err; 319f758c885STrond Myklebust if (pgio.pg_error < 0) 320f758c885STrond Myklebust return pgio.pg_error; 321f758c885STrond Myklebust return 0; 3224d770ccfSTrond Myklebust } 3234d770ccfSTrond Myklebust 3244d770ccfSTrond Myklebust int nfs_writepage(struct page *page, struct writeback_control *wbc) 3254d770ccfSTrond Myklebust { 326f758c885STrond Myklebust int ret; 3274d770ccfSTrond Myklebust 328f758c885STrond Myklebust ret = nfs_writepage_locked(page, wbc); 3291da177e4SLinus Torvalds unlock_page(page); 330f758c885STrond Myklebust return ret; 331f758c885STrond Myklebust } 332f758c885STrond Myklebust 333f758c885STrond Myklebust static int nfs_writepages_callback(struct page *page, struct writeback_control *wbc, void *data) 334f758c885STrond Myklebust { 335f758c885STrond Myklebust int ret; 336f758c885STrond Myklebust 337f758c885STrond Myklebust ret = nfs_do_writepage(page, wbc, data); 338f758c885STrond Myklebust unlock_page(page); 339f758c885STrond Myklebust return ret; 3401da177e4SLinus Torvalds } 3411da177e4SLinus Torvalds 3421da177e4SLinus Torvalds int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc) 3431da177e4SLinus Torvalds { 3441da177e4SLinus Torvalds struct inode *inode = mapping->host; 345c63c7b05STrond Myklebust struct nfs_pageio_descriptor pgio; 3461da177e4SLinus Torvalds int err; 3471da177e4SLinus Torvalds 34891d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES); 34991d5b470SChuck Lever 350c63c7b05STrond Myklebust nfs_pageio_init_write(&pgio, inode, wb_priority(wbc)); 351f758c885STrond Myklebust err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio); 352c63c7b05STrond Myklebust nfs_pageio_complete(&pgio); 353f758c885STrond Myklebust if (err < 0) 3541da177e4SLinus Torvalds return err; 355f758c885STrond Myklebust if (pgio.pg_error < 0) 356c63c7b05STrond Myklebust return pgio.pg_error; 357c63c7b05STrond Myklebust return 0; 3581da177e4SLinus Torvalds } 3591da177e4SLinus Torvalds 3601da177e4SLinus Torvalds /* 3611da177e4SLinus Torvalds * Insert a write request into an inode 3621da177e4SLinus Torvalds */ 363*27852596SNick Piggin static void nfs_inode_add_request(struct inode *inode, struct nfs_page *req) 3641da177e4SLinus Torvalds { 3651da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 3661da177e4SLinus Torvalds int error; 3671da177e4SLinus Torvalds 3681da177e4SLinus Torvalds error = radix_tree_insert(&nfsi->nfs_page_tree, req->wb_index, req); 369*27852596SNick Piggin BUG_ON(error); 3701da177e4SLinus Torvalds if (!nfsi->npages) { 3711da177e4SLinus Torvalds igrab(inode); 3721da177e4SLinus Torvalds if (nfs_have_delegation(inode, FMODE_WRITE)) 3731da177e4SLinus Torvalds nfsi->change_attr++; 3741da177e4SLinus Torvalds } 375deb7d638STrond Myklebust SetPagePrivate(req->wb_page); 376277459d2STrond Myklebust set_page_private(req->wb_page, (unsigned long)req); 3771da177e4SLinus Torvalds nfsi->npages++; 378c03b4024STrond Myklebust kref_get(&req->wb_kref); 379*27852596SNick Piggin radix_tree_tag_set(&nfsi->nfs_page_tree, req->wb_index, 380*27852596SNick Piggin NFS_PAGE_TAG_LOCKED); 3811da177e4SLinus Torvalds } 3821da177e4SLinus Torvalds 3831da177e4SLinus Torvalds /* 38489a09141SPeter Zijlstra * Remove a write request from an inode 3851da177e4SLinus Torvalds */ 3861da177e4SLinus Torvalds static void nfs_inode_remove_request(struct nfs_page *req) 3871da177e4SLinus Torvalds { 38888be9f99STrond Myklebust struct inode *inode = req->wb_context->path.dentry->d_inode; 3891da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 3901da177e4SLinus Torvalds 3911da177e4SLinus Torvalds BUG_ON (!NFS_WBACK_BUSY(req)); 3921da177e4SLinus Torvalds 393587142f8STrond Myklebust spin_lock(&inode->i_lock); 394277459d2STrond Myklebust set_page_private(req->wb_page, 0); 395deb7d638STrond Myklebust ClearPagePrivate(req->wb_page); 3961da177e4SLinus Torvalds radix_tree_delete(&nfsi->nfs_page_tree, req->wb_index); 3971da177e4SLinus Torvalds nfsi->npages--; 3981da177e4SLinus Torvalds if (!nfsi->npages) { 399587142f8STrond Myklebust spin_unlock(&inode->i_lock); 4001da177e4SLinus Torvalds iput(inode); 4011da177e4SLinus Torvalds } else 402587142f8STrond Myklebust spin_unlock(&inode->i_lock); 4031da177e4SLinus Torvalds nfs_clear_request(req); 4041da177e4SLinus Torvalds nfs_release_request(req); 4051da177e4SLinus Torvalds } 4061da177e4SLinus Torvalds 40761822ab5STrond Myklebust static void 40861822ab5STrond Myklebust nfs_redirty_request(struct nfs_page *req) 40961822ab5STrond Myklebust { 41061822ab5STrond Myklebust __set_page_dirty_nobuffers(req->wb_page); 41161822ab5STrond Myklebust } 41261822ab5STrond Myklebust 4131da177e4SLinus Torvalds /* 4141da177e4SLinus Torvalds * Check if a request is dirty 4151da177e4SLinus Torvalds */ 4161da177e4SLinus Torvalds static inline int 4171da177e4SLinus Torvalds nfs_dirty_request(struct nfs_page *req) 4181da177e4SLinus Torvalds { 4195a6d41b3STrond Myklebust struct page *page = req->wb_page; 4205a6d41b3STrond Myklebust 421612c9384STrond Myklebust if (page == NULL || test_bit(PG_NEED_COMMIT, &req->wb_flags)) 4225a6d41b3STrond Myklebust return 0; 4235a6d41b3STrond Myklebust return !PageWriteback(req->wb_page); 4241da177e4SLinus Torvalds } 4251da177e4SLinus Torvalds 4261da177e4SLinus Torvalds #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) 4271da177e4SLinus Torvalds /* 4281da177e4SLinus Torvalds * Add a request to the inode's commit list. 4291da177e4SLinus Torvalds */ 4301da177e4SLinus Torvalds static void 4311da177e4SLinus Torvalds nfs_mark_request_commit(struct nfs_page *req) 4321da177e4SLinus Torvalds { 43388be9f99STrond Myklebust struct inode *inode = req->wb_context->path.dentry->d_inode; 4341da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 4351da177e4SLinus Torvalds 436587142f8STrond Myklebust spin_lock(&inode->i_lock); 4371da177e4SLinus Torvalds nfsi->ncommit++; 438612c9384STrond Myklebust set_bit(PG_NEED_COMMIT, &(req)->wb_flags); 4395c369683STrond Myklebust radix_tree_tag_set(&nfsi->nfs_page_tree, 4405c369683STrond Myklebust req->wb_index, 4415c369683STrond Myklebust NFS_PAGE_TAG_COMMIT); 442587142f8STrond Myklebust spin_unlock(&inode->i_lock); 443fd39fc85SChristoph Lameter inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); 444c9e51e41SPeter Zijlstra inc_bdi_stat(req->wb_page->mapping->backing_dev_info, BDI_RECLAIMABLE); 445a1803044STrond Myklebust __mark_inode_dirty(inode, I_DIRTY_DATASYNC); 4461da177e4SLinus Torvalds } 4478e821cadSTrond Myklebust 4488e821cadSTrond Myklebust static inline 4498e821cadSTrond Myklebust int nfs_write_need_commit(struct nfs_write_data *data) 4508e821cadSTrond Myklebust { 4518e821cadSTrond Myklebust return data->verf.committed != NFS_FILE_SYNC; 4528e821cadSTrond Myklebust } 4538e821cadSTrond Myklebust 4548e821cadSTrond Myklebust static inline 4558e821cadSTrond Myklebust int nfs_reschedule_unstable_write(struct nfs_page *req) 4568e821cadSTrond Myklebust { 457612c9384STrond Myklebust if (test_bit(PG_NEED_COMMIT, &req->wb_flags)) { 4588e821cadSTrond Myklebust nfs_mark_request_commit(req); 4598e821cadSTrond Myklebust return 1; 4608e821cadSTrond Myklebust } 4618e821cadSTrond Myklebust if (test_and_clear_bit(PG_NEED_RESCHED, &req->wb_flags)) { 4628e821cadSTrond Myklebust nfs_redirty_request(req); 4638e821cadSTrond Myklebust return 1; 4648e821cadSTrond Myklebust } 4658e821cadSTrond Myklebust return 0; 4668e821cadSTrond Myklebust } 4678e821cadSTrond Myklebust #else 4688e821cadSTrond Myklebust static inline void 4698e821cadSTrond Myklebust nfs_mark_request_commit(struct nfs_page *req) 4708e821cadSTrond Myklebust { 4718e821cadSTrond Myklebust } 4728e821cadSTrond Myklebust 4738e821cadSTrond Myklebust static inline 4748e821cadSTrond Myklebust int nfs_write_need_commit(struct nfs_write_data *data) 4758e821cadSTrond Myklebust { 4768e821cadSTrond Myklebust return 0; 4778e821cadSTrond Myklebust } 4788e821cadSTrond Myklebust 4798e821cadSTrond Myklebust static inline 4808e821cadSTrond Myklebust int nfs_reschedule_unstable_write(struct nfs_page *req) 4818e821cadSTrond Myklebust { 4828e821cadSTrond Myklebust return 0; 4838e821cadSTrond Myklebust } 4841da177e4SLinus Torvalds #endif 4851da177e4SLinus Torvalds 4861da177e4SLinus Torvalds /* 4871da177e4SLinus Torvalds * Wait for a request to complete. 4881da177e4SLinus Torvalds * 489150030b7SMatthew Wilcox * Interruptible by fatal signals only. 4901da177e4SLinus Torvalds */ 491ca52fec1STrond Myklebust static int nfs_wait_on_requests_locked(struct inode *inode, pgoff_t idx_start, unsigned int npages) 4921da177e4SLinus Torvalds { 4931da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 4941da177e4SLinus Torvalds struct nfs_page *req; 495ca52fec1STrond Myklebust pgoff_t idx_end, next; 4961da177e4SLinus Torvalds unsigned int res = 0; 4971da177e4SLinus Torvalds int error; 4981da177e4SLinus Torvalds 4991da177e4SLinus Torvalds if (npages == 0) 5001da177e4SLinus Torvalds idx_end = ~0; 5011da177e4SLinus Torvalds else 5021da177e4SLinus Torvalds idx_end = idx_start + npages - 1; 5031da177e4SLinus Torvalds 5041da177e4SLinus Torvalds next = idx_start; 5059fd367f0STrond Myklebust while (radix_tree_gang_lookup_tag(&nfsi->nfs_page_tree, (void **)&req, next, 1, NFS_PAGE_TAG_LOCKED)) { 5061da177e4SLinus Torvalds if (req->wb_index > idx_end) 5071da177e4SLinus Torvalds break; 5081da177e4SLinus Torvalds 5091da177e4SLinus Torvalds next = req->wb_index + 1; 510c6a556b8STrond Myklebust BUG_ON(!NFS_WBACK_BUSY(req)); 5111da177e4SLinus Torvalds 512c03b4024STrond Myklebust kref_get(&req->wb_kref); 513587142f8STrond Myklebust spin_unlock(&inode->i_lock); 5141da177e4SLinus Torvalds error = nfs_wait_on_request(req); 5151da177e4SLinus Torvalds nfs_release_request(req); 516587142f8STrond Myklebust spin_lock(&inode->i_lock); 5171da177e4SLinus Torvalds if (error < 0) 5181da177e4SLinus Torvalds return error; 5191da177e4SLinus Torvalds res++; 5201da177e4SLinus Torvalds } 5211da177e4SLinus Torvalds return res; 5221da177e4SLinus Torvalds } 5231da177e4SLinus Torvalds 52483715ad5STrond Myklebust static void nfs_cancel_commit_list(struct list_head *head) 52583715ad5STrond Myklebust { 52683715ad5STrond Myklebust struct nfs_page *req; 52783715ad5STrond Myklebust 52883715ad5STrond Myklebust while(!list_empty(head)) { 52983715ad5STrond Myklebust req = nfs_list_entry(head->next); 530b6dff26aSTrond Myklebust dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); 531c9e51e41SPeter Zijlstra dec_bdi_stat(req->wb_page->mapping->backing_dev_info, 532c9e51e41SPeter Zijlstra BDI_RECLAIMABLE); 53383715ad5STrond Myklebust nfs_list_remove_request(req); 534612c9384STrond Myklebust clear_bit(PG_NEED_COMMIT, &(req)->wb_flags); 53583715ad5STrond Myklebust nfs_inode_remove_request(req); 536b6dff26aSTrond Myklebust nfs_unlock_request(req); 53783715ad5STrond Myklebust } 53883715ad5STrond Myklebust } 53983715ad5STrond Myklebust 5401da177e4SLinus Torvalds #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) 5411da177e4SLinus Torvalds /* 5421da177e4SLinus Torvalds * nfs_scan_commit - Scan an inode for commit requests 5431da177e4SLinus Torvalds * @inode: NFS inode to scan 5441da177e4SLinus Torvalds * @dst: destination list 5451da177e4SLinus Torvalds * @idx_start: lower bound of page->index to scan. 5461da177e4SLinus Torvalds * @npages: idx_start + npages sets the upper bound to scan. 5471da177e4SLinus Torvalds * 5481da177e4SLinus Torvalds * Moves requests from the inode's 'commit' request list. 5491da177e4SLinus Torvalds * The requests are *not* checked to ensure that they form a contiguous set. 5501da177e4SLinus Torvalds */ 5511da177e4SLinus Torvalds static int 552ca52fec1STrond Myklebust nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, unsigned int npages) 5531da177e4SLinus Torvalds { 5541da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 5553da28eb1STrond Myklebust int res = 0; 5563da28eb1STrond Myklebust 5573da28eb1STrond Myklebust if (nfsi->ncommit != 0) { 5585c369683STrond Myklebust res = nfs_scan_list(nfsi, dst, idx_start, npages, 5595c369683STrond Myklebust NFS_PAGE_TAG_COMMIT); 5601da177e4SLinus Torvalds nfsi->ncommit -= res; 5613da28eb1STrond Myklebust } 5621da177e4SLinus Torvalds return res; 5631da177e4SLinus Torvalds } 564c42de9ddSTrond Myklebust #else 565ca52fec1STrond Myklebust static inline int nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, unsigned int npages) 566c42de9ddSTrond Myklebust { 567c42de9ddSTrond Myklebust return 0; 568c42de9ddSTrond Myklebust } 5691da177e4SLinus Torvalds #endif 5701da177e4SLinus Torvalds 5711da177e4SLinus Torvalds /* 5721da177e4SLinus Torvalds * Try to update any existing write request, or create one if there is none. 5731da177e4SLinus Torvalds * In order to match, the request's credentials must match those of 5741da177e4SLinus Torvalds * the calling process. 5751da177e4SLinus Torvalds * 5761da177e4SLinus Torvalds * Note: Should always be called with the Page Lock held! 5771da177e4SLinus Torvalds */ 5781da177e4SLinus Torvalds static struct nfs_page * nfs_update_request(struct nfs_open_context* ctx, 579e21195a7STrond Myklebust struct page *page, unsigned int offset, unsigned int bytes) 5801da177e4SLinus Torvalds { 58189a09141SPeter Zijlstra struct address_space *mapping = page->mapping; 58289a09141SPeter Zijlstra struct inode *inode = mapping->host; 5831da177e4SLinus Torvalds struct nfs_page *req, *new = NULL; 584ca52fec1STrond Myklebust pgoff_t rqend, end; 5851da177e4SLinus Torvalds 5861da177e4SLinus Torvalds end = offset + bytes; 5871da177e4SLinus Torvalds 5881da177e4SLinus Torvalds for (;;) { 5891da177e4SLinus Torvalds /* Loop over all inode entries and see if we find 5901da177e4SLinus Torvalds * A request for the page we wish to update 5911da177e4SLinus Torvalds */ 592*27852596SNick Piggin if (new) { 593*27852596SNick Piggin if (radix_tree_preload(GFP_NOFS)) { 594*27852596SNick Piggin nfs_release_request(new); 595*27852596SNick Piggin return ERR_PTR(-ENOMEM); 596*27852596SNick Piggin } 597*27852596SNick Piggin } 598*27852596SNick Piggin 599587142f8STrond Myklebust spin_lock(&inode->i_lock); 600277459d2STrond Myklebust req = nfs_page_find_request_locked(page); 6011da177e4SLinus Torvalds if (req) { 602acee478aSTrond Myklebust if (!nfs_set_page_tag_locked(req)) { 6031da177e4SLinus Torvalds int error; 604277459d2STrond Myklebust 605587142f8STrond Myklebust spin_unlock(&inode->i_lock); 6061da177e4SLinus Torvalds error = nfs_wait_on_request(req); 6071da177e4SLinus Torvalds nfs_release_request(req); 6081dd594b2SNeil Brown if (error < 0) { 609*27852596SNick Piggin if (new) { 610*27852596SNick Piggin radix_tree_preload_end(); 6111dd594b2SNeil Brown nfs_release_request(new); 612*27852596SNick Piggin } 6131da177e4SLinus Torvalds return ERR_PTR(error); 6141dd594b2SNeil Brown } 6151da177e4SLinus Torvalds continue; 6161da177e4SLinus Torvalds } 617587142f8STrond Myklebust spin_unlock(&inode->i_lock); 618*27852596SNick Piggin if (new) { 619*27852596SNick Piggin radix_tree_preload_end(); 6201da177e4SLinus Torvalds nfs_release_request(new); 621*27852596SNick Piggin } 6221da177e4SLinus Torvalds break; 6231da177e4SLinus Torvalds } 6241da177e4SLinus Torvalds 6251da177e4SLinus Torvalds if (new) { 6261da177e4SLinus Torvalds nfs_lock_request_dontget(new); 627*27852596SNick Piggin nfs_inode_add_request(inode, new); 628587142f8STrond Myklebust spin_unlock(&inode->i_lock); 629*27852596SNick Piggin radix_tree_preload_end(); 63061e930a9STrond Myklebust req = new; 63161e930a9STrond Myklebust goto zero_page; 6321da177e4SLinus Torvalds } 633587142f8STrond Myklebust spin_unlock(&inode->i_lock); 6341da177e4SLinus Torvalds 6351da177e4SLinus Torvalds new = nfs_create_request(ctx, inode, page, offset, bytes); 6361da177e4SLinus Torvalds if (IS_ERR(new)) 6371da177e4SLinus Torvalds return new; 6381da177e4SLinus Torvalds } 6391da177e4SLinus Torvalds 6401da177e4SLinus Torvalds /* We have a request for our page. 6411da177e4SLinus Torvalds * If the creds don't match, or the 6421da177e4SLinus Torvalds * page addresses don't match, 6431da177e4SLinus Torvalds * tell the caller to wait on the conflicting 6441da177e4SLinus Torvalds * request. 6451da177e4SLinus Torvalds */ 6461da177e4SLinus Torvalds rqend = req->wb_offset + req->wb_bytes; 6471da177e4SLinus Torvalds if (req->wb_context != ctx 6481da177e4SLinus Torvalds || req->wb_page != page 6491da177e4SLinus Torvalds || !nfs_dirty_request(req) 6501da177e4SLinus Torvalds || offset > rqend || end < req->wb_offset) { 651acee478aSTrond Myklebust nfs_clear_page_tag_locked(req); 6521da177e4SLinus Torvalds return ERR_PTR(-EBUSY); 6531da177e4SLinus Torvalds } 6541da177e4SLinus Torvalds 6551da177e4SLinus Torvalds /* Okay, the request matches. Update the region */ 6561da177e4SLinus Torvalds if (offset < req->wb_offset) { 6571da177e4SLinus Torvalds req->wb_offset = offset; 6581da177e4SLinus Torvalds req->wb_pgbase = offset; 65961e930a9STrond Myklebust req->wb_bytes = max(end, rqend) - req->wb_offset; 66061e930a9STrond Myklebust goto zero_page; 6611da177e4SLinus Torvalds } 6621da177e4SLinus Torvalds 6631da177e4SLinus Torvalds if (end > rqend) 6641da177e4SLinus Torvalds req->wb_bytes = end - req->wb_offset; 6651da177e4SLinus Torvalds 6661da177e4SLinus Torvalds return req; 66761e930a9STrond Myklebust zero_page: 66861e930a9STrond Myklebust /* If this page might potentially be marked as up to date, 66961e930a9STrond Myklebust * then we need to zero any uninitalised data. */ 67061e930a9STrond Myklebust if (req->wb_pgbase == 0 && req->wb_bytes != PAGE_CACHE_SIZE 67161e930a9STrond Myklebust && !PageUptodate(req->wb_page)) 672eebd2aa3SChristoph Lameter zero_user_segment(req->wb_page, req->wb_bytes, PAGE_CACHE_SIZE); 67361e930a9STrond Myklebust return req; 6741da177e4SLinus Torvalds } 6751da177e4SLinus Torvalds 6761da177e4SLinus Torvalds int nfs_flush_incompatible(struct file *file, struct page *page) 6771da177e4SLinus Torvalds { 678cd3758e3STrond Myklebust struct nfs_open_context *ctx = nfs_file_open_context(file); 6791da177e4SLinus Torvalds struct nfs_page *req; 6801a54533eSTrond Myklebust int do_flush, status; 6811da177e4SLinus Torvalds /* 6821da177e4SLinus Torvalds * Look for a request corresponding to this page. If there 6831da177e4SLinus Torvalds * is one, and it belongs to another file, we flush it out 6841da177e4SLinus Torvalds * before we try to copy anything into the page. Do this 6851da177e4SLinus Torvalds * due to the lack of an ACCESS-type call in NFSv2. 6861da177e4SLinus Torvalds * Also do the same if we find a request from an existing 6871da177e4SLinus Torvalds * dropped page. 6881da177e4SLinus Torvalds */ 6891a54533eSTrond Myklebust do { 690277459d2STrond Myklebust req = nfs_page_find_request(page); 6911a54533eSTrond Myklebust if (req == NULL) 6921a54533eSTrond Myklebust return 0; 6931a54533eSTrond Myklebust do_flush = req->wb_page != page || req->wb_context != ctx 694e261f51fSTrond Myklebust || !nfs_dirty_request(req); 6951da177e4SLinus Torvalds nfs_release_request(req); 6961a54533eSTrond Myklebust if (!do_flush) 6971a54533eSTrond Myklebust return 0; 698277459d2STrond Myklebust status = nfs_wb_page(page->mapping->host, page); 6991a54533eSTrond Myklebust } while (status == 0); 7001a54533eSTrond Myklebust return status; 7011da177e4SLinus Torvalds } 7021da177e4SLinus Torvalds 7031da177e4SLinus Torvalds /* 7045d47a356STrond Myklebust * If the page cache is marked as unsafe or invalid, then we can't rely on 7055d47a356STrond Myklebust * the PageUptodate() flag. In this case, we will need to turn off 7065d47a356STrond Myklebust * write optimisations that depend on the page contents being correct. 7075d47a356STrond Myklebust */ 7085d47a356STrond Myklebust static int nfs_write_pageuptodate(struct page *page, struct inode *inode) 7095d47a356STrond Myklebust { 7105d47a356STrond Myklebust return PageUptodate(page) && 7115d47a356STrond Myklebust !(NFS_I(inode)->cache_validity & (NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA)); 7125d47a356STrond Myklebust } 7135d47a356STrond Myklebust 7145d47a356STrond Myklebust /* 7151da177e4SLinus Torvalds * Update and possibly write a cached page of an NFS file. 7161da177e4SLinus Torvalds * 7171da177e4SLinus Torvalds * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad 7181da177e4SLinus Torvalds * things with a page scheduled for an RPC call (e.g. invalidate it). 7191da177e4SLinus Torvalds */ 7201da177e4SLinus Torvalds int nfs_updatepage(struct file *file, struct page *page, 7211da177e4SLinus Torvalds unsigned int offset, unsigned int count) 7221da177e4SLinus Torvalds { 723cd3758e3STrond Myklebust struct nfs_open_context *ctx = nfs_file_open_context(file); 7241da177e4SLinus Torvalds struct inode *inode = page->mapping->host; 7251da177e4SLinus Torvalds int status = 0; 7261da177e4SLinus Torvalds 72791d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE); 72891d5b470SChuck Lever 7291da177e4SLinus Torvalds dprintk("NFS: nfs_updatepage(%s/%s %d@%Ld)\n", 73001cce933SJosef "Jeff" Sipek file->f_path.dentry->d_parent->d_name.name, 73101cce933SJosef "Jeff" Sipek file->f_path.dentry->d_name.name, count, 7320bbacc40SChuck Lever (long long)(page_offset(page) +offset)); 7331da177e4SLinus Torvalds 7341da177e4SLinus Torvalds /* If we're not using byte range locks, and we know the page 7355d47a356STrond Myklebust * is up to date, it may be more efficient to extend the write 7365d47a356STrond Myklebust * to cover the entire page in order to avoid fragmentation 7375d47a356STrond Myklebust * inefficiencies. 7381da177e4SLinus Torvalds */ 7395d47a356STrond Myklebust if (nfs_write_pageuptodate(page, inode) && 7405d47a356STrond Myklebust inode->i_flock == NULL && 7415d47a356STrond Myklebust !(file->f_mode & O_SYNC)) { 74249a70f27STrond Myklebust count = max(count + offset, nfs_page_length(page)); 7431da177e4SLinus Torvalds offset = 0; 7441da177e4SLinus Torvalds } 7451da177e4SLinus Torvalds 746e21195a7STrond Myklebust status = nfs_writepage_setup(ctx, page, offset, count); 747e261f51fSTrond Myklebust __set_page_dirty_nobuffers(page); 7481da177e4SLinus Torvalds 7491da177e4SLinus Torvalds dprintk("NFS: nfs_updatepage returns %d (isize %Ld)\n", 7501da177e4SLinus Torvalds status, (long long)i_size_read(inode)); 7511da177e4SLinus Torvalds if (status < 0) 752a301b777STrond Myklebust nfs_set_pageerror(page); 7531da177e4SLinus Torvalds return status; 7541da177e4SLinus Torvalds } 7551da177e4SLinus Torvalds 7561da177e4SLinus Torvalds static void nfs_writepage_release(struct nfs_page *req) 7571da177e4SLinus Torvalds { 7588e821cadSTrond Myklebust 75944dd151dSTrond Myklebust if (PageError(req->wb_page)) { 76044dd151dSTrond Myklebust nfs_end_page_writeback(req->wb_page); 76144dd151dSTrond Myklebust nfs_inode_remove_request(req); 76244dd151dSTrond Myklebust } else if (!nfs_reschedule_unstable_write(req)) { 76344dd151dSTrond Myklebust /* Set the PG_uptodate flag */ 76444dd151dSTrond Myklebust nfs_mark_uptodate(req->wb_page, req->wb_pgbase, req->wb_bytes); 76589a09141SPeter Zijlstra nfs_end_page_writeback(req->wb_page); 7661da177e4SLinus Torvalds nfs_inode_remove_request(req); 7678e821cadSTrond Myklebust } else 7688e821cadSTrond Myklebust nfs_end_page_writeback(req->wb_page); 7699fd367f0STrond Myklebust nfs_clear_page_tag_locked(req); 7701da177e4SLinus Torvalds } 7711da177e4SLinus Torvalds 7723ff7576dSTrond Myklebust static int flush_task_priority(int how) 7731da177e4SLinus Torvalds { 7741da177e4SLinus Torvalds switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) { 7751da177e4SLinus Torvalds case FLUSH_HIGHPRI: 7761da177e4SLinus Torvalds return RPC_PRIORITY_HIGH; 7771da177e4SLinus Torvalds case FLUSH_LOWPRI: 7781da177e4SLinus Torvalds return RPC_PRIORITY_LOW; 7791da177e4SLinus Torvalds } 7801da177e4SLinus Torvalds return RPC_PRIORITY_NORMAL; 7811da177e4SLinus Torvalds } 7821da177e4SLinus Torvalds 7831da177e4SLinus Torvalds /* 7841da177e4SLinus Torvalds * Set up the argument/result storage required for the RPC call. 7851da177e4SLinus Torvalds */ 7861da177e4SLinus Torvalds static void nfs_write_rpcsetup(struct nfs_page *req, 7871da177e4SLinus Torvalds struct nfs_write_data *data, 788788e7a89STrond Myklebust const struct rpc_call_ops *call_ops, 7891da177e4SLinus Torvalds unsigned int count, unsigned int offset, 7901da177e4SLinus Torvalds int how) 7911da177e4SLinus Torvalds { 79284115e1cSTrond Myklebust struct inode *inode = req->wb_context->path.dentry->d_inode; 79384115e1cSTrond Myklebust int flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; 7943ff7576dSTrond Myklebust int priority = flush_task_priority(how); 79507737691STrond Myklebust struct rpc_task *task; 796bdc7f021STrond Myklebust struct rpc_message msg = { 797bdc7f021STrond Myklebust .rpc_argp = &data->args, 798bdc7f021STrond Myklebust .rpc_resp = &data->res, 799bdc7f021STrond Myklebust .rpc_cred = req->wb_context->cred, 800bdc7f021STrond Myklebust }; 80184115e1cSTrond Myklebust struct rpc_task_setup task_setup_data = { 80284115e1cSTrond Myklebust .rpc_client = NFS_CLIENT(inode), 80307737691STrond Myklebust .task = &data->task, 804bdc7f021STrond Myklebust .rpc_message = &msg, 80584115e1cSTrond Myklebust .callback_ops = call_ops, 80684115e1cSTrond Myklebust .callback_data = data, 80784115e1cSTrond Myklebust .flags = flags, 8083ff7576dSTrond Myklebust .priority = priority, 80984115e1cSTrond Myklebust }; 8101da177e4SLinus Torvalds 8111da177e4SLinus Torvalds /* Set up the RPC argument and reply structs 8121da177e4SLinus Torvalds * NB: take care not to mess about with data->commit et al. */ 8131da177e4SLinus Torvalds 8141da177e4SLinus Torvalds data->req = req; 81588be9f99STrond Myklebust data->inode = inode = req->wb_context->path.dentry->d_inode; 816bdc7f021STrond Myklebust data->cred = msg.rpc_cred; 8171da177e4SLinus Torvalds 8181da177e4SLinus Torvalds data->args.fh = NFS_FH(inode); 8191da177e4SLinus Torvalds data->args.offset = req_offset(req) + offset; 8201da177e4SLinus Torvalds data->args.pgbase = req->wb_pgbase + offset; 8211da177e4SLinus Torvalds data->args.pages = data->pagevec; 8221da177e4SLinus Torvalds data->args.count = count; 8231da177e4SLinus Torvalds data->args.context = req->wb_context; 824bdc7f021STrond Myklebust data->args.stable = NFS_UNSTABLE; 825bdc7f021STrond Myklebust if (how & FLUSH_STABLE) { 826bdc7f021STrond Myklebust data->args.stable = NFS_DATA_SYNC; 827bdc7f021STrond Myklebust if (!NFS_I(inode)->ncommit) 828bdc7f021STrond Myklebust data->args.stable = NFS_FILE_SYNC; 829bdc7f021STrond Myklebust } 8301da177e4SLinus Torvalds 8311da177e4SLinus Torvalds data->res.fattr = &data->fattr; 8321da177e4SLinus Torvalds data->res.count = count; 8331da177e4SLinus Torvalds data->res.verf = &data->verf; 8340e574af1STrond Myklebust nfs_fattr_init(&data->fattr); 8351da177e4SLinus Torvalds 836788e7a89STrond Myklebust /* Set up the initial task struct. */ 837bdc7f021STrond Myklebust NFS_PROTO(inode)->write_setup(data, &msg); 8381da177e4SLinus Torvalds 839a3f565b1SChuck Lever dprintk("NFS: %5u initiated write call " 840a3f565b1SChuck Lever "(req %s/%Ld, %u bytes @ offset %Lu)\n", 8410bbacc40SChuck Lever data->task.tk_pid, 8421da177e4SLinus Torvalds inode->i_sb->s_id, 8431da177e4SLinus Torvalds (long long)NFS_FILEID(inode), 8441da177e4SLinus Torvalds count, 8451da177e4SLinus Torvalds (unsigned long long)data->args.offset); 8461da177e4SLinus Torvalds 84707737691STrond Myklebust task = rpc_run_task(&task_setup_data); 84807737691STrond Myklebust if (!IS_ERR(task)) 84907737691STrond Myklebust rpc_put_task(task); 8501da177e4SLinus Torvalds } 8511da177e4SLinus Torvalds 8521da177e4SLinus Torvalds /* 8531da177e4SLinus Torvalds * Generate multiple small requests to write out a single 8541da177e4SLinus Torvalds * contiguous dirty area on one page. 8551da177e4SLinus Torvalds */ 8568d5658c9STrond Myklebust static int nfs_flush_multi(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int how) 8571da177e4SLinus Torvalds { 8581da177e4SLinus Torvalds struct nfs_page *req = nfs_list_entry(head->next); 8591da177e4SLinus Torvalds struct page *page = req->wb_page; 8601da177e4SLinus Torvalds struct nfs_write_data *data; 861e9f7bee1STrond Myklebust size_t wsize = NFS_SERVER(inode)->wsize, nbytes; 862e9f7bee1STrond Myklebust unsigned int offset; 8631da177e4SLinus Torvalds int requests = 0; 8641da177e4SLinus Torvalds LIST_HEAD(list); 8651da177e4SLinus Torvalds 8661da177e4SLinus Torvalds nfs_list_remove_request(req); 8671da177e4SLinus Torvalds 868bcb71bbaSTrond Myklebust nbytes = count; 869e9f7bee1STrond Myklebust do { 870e9f7bee1STrond Myklebust size_t len = min(nbytes, wsize); 871e9f7bee1STrond Myklebust 8728d5658c9STrond Myklebust data = nfs_writedata_alloc(1); 8731da177e4SLinus Torvalds if (!data) 8741da177e4SLinus Torvalds goto out_bad; 8751da177e4SLinus Torvalds list_add(&data->pages, &list); 8761da177e4SLinus Torvalds requests++; 877e9f7bee1STrond Myklebust nbytes -= len; 878e9f7bee1STrond Myklebust } while (nbytes != 0); 8791da177e4SLinus Torvalds atomic_set(&req->wb_complete, requests); 8801da177e4SLinus Torvalds 8811da177e4SLinus Torvalds ClearPageError(page); 8821da177e4SLinus Torvalds offset = 0; 883bcb71bbaSTrond Myklebust nbytes = count; 8841da177e4SLinus Torvalds do { 8851da177e4SLinus Torvalds data = list_entry(list.next, struct nfs_write_data, pages); 8861da177e4SLinus Torvalds list_del_init(&data->pages); 8871da177e4SLinus Torvalds 8881da177e4SLinus Torvalds data->pagevec[0] = page; 8891da177e4SLinus Torvalds 890bcb71bbaSTrond Myklebust if (nbytes < wsize) 891bcb71bbaSTrond Myklebust wsize = nbytes; 892788e7a89STrond Myklebust nfs_write_rpcsetup(req, data, &nfs_write_partial_ops, 893788e7a89STrond Myklebust wsize, offset, how); 8941da177e4SLinus Torvalds offset += wsize; 8951da177e4SLinus Torvalds nbytes -= wsize; 8961da177e4SLinus Torvalds } while (nbytes != 0); 8971da177e4SLinus Torvalds 8981da177e4SLinus Torvalds return 0; 8991da177e4SLinus Torvalds 9001da177e4SLinus Torvalds out_bad: 9011da177e4SLinus Torvalds while (!list_empty(&list)) { 9021da177e4SLinus Torvalds data = list_entry(list.next, struct nfs_write_data, pages); 9031da177e4SLinus Torvalds list_del(&data->pages); 9048aca67f0STrond Myklebust nfs_writedata_release(data); 9051da177e4SLinus Torvalds } 90661822ab5STrond Myklebust nfs_redirty_request(req); 9076d677e35STrond Myklebust nfs_end_page_writeback(req->wb_page); 9089fd367f0STrond Myklebust nfs_clear_page_tag_locked(req); 9091da177e4SLinus Torvalds return -ENOMEM; 9101da177e4SLinus Torvalds } 9111da177e4SLinus Torvalds 9121da177e4SLinus Torvalds /* 9131da177e4SLinus Torvalds * Create an RPC task for the given write request and kick it. 9141da177e4SLinus Torvalds * The page must have been locked by the caller. 9151da177e4SLinus Torvalds * 9161da177e4SLinus Torvalds * It may happen that the page we're passed is not marked dirty. 9171da177e4SLinus Torvalds * This is the case if nfs_updatepage detects a conflicting request 9181da177e4SLinus Torvalds * that has been written but not committed. 9191da177e4SLinus Torvalds */ 9208d5658c9STrond Myklebust static int nfs_flush_one(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int how) 9211da177e4SLinus Torvalds { 9221da177e4SLinus Torvalds struct nfs_page *req; 9231da177e4SLinus Torvalds struct page **pages; 9241da177e4SLinus Torvalds struct nfs_write_data *data; 9251da177e4SLinus Torvalds 9268d5658c9STrond Myklebust data = nfs_writedata_alloc(npages); 9271da177e4SLinus Torvalds if (!data) 9281da177e4SLinus Torvalds goto out_bad; 9291da177e4SLinus Torvalds 9301da177e4SLinus Torvalds pages = data->pagevec; 9311da177e4SLinus Torvalds while (!list_empty(head)) { 9321da177e4SLinus Torvalds req = nfs_list_entry(head->next); 9331da177e4SLinus Torvalds nfs_list_remove_request(req); 9341da177e4SLinus Torvalds nfs_list_add_request(req, &data->pages); 9351da177e4SLinus Torvalds ClearPageError(req->wb_page); 9361da177e4SLinus Torvalds *pages++ = req->wb_page; 9371da177e4SLinus Torvalds } 9381da177e4SLinus Torvalds req = nfs_list_entry(data->pages.next); 9391da177e4SLinus Torvalds 9401da177e4SLinus Torvalds /* Set up the argument struct */ 941788e7a89STrond Myklebust nfs_write_rpcsetup(req, data, &nfs_write_full_ops, count, 0, how); 9421da177e4SLinus Torvalds 9431da177e4SLinus Torvalds return 0; 9441da177e4SLinus Torvalds out_bad: 9451da177e4SLinus Torvalds while (!list_empty(head)) { 94610afec90STrond Myklebust req = nfs_list_entry(head->next); 9471da177e4SLinus Torvalds nfs_list_remove_request(req); 94861822ab5STrond Myklebust nfs_redirty_request(req); 9496d677e35STrond Myklebust nfs_end_page_writeback(req->wb_page); 9509fd367f0STrond Myklebust nfs_clear_page_tag_locked(req); 9511da177e4SLinus Torvalds } 9521da177e4SLinus Torvalds return -ENOMEM; 9531da177e4SLinus Torvalds } 9541da177e4SLinus Torvalds 955c63c7b05STrond Myklebust static void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, 956c63c7b05STrond Myklebust struct inode *inode, int ioflags) 9571da177e4SLinus Torvalds { 958bf4285e7SChuck Lever size_t wsize = NFS_SERVER(inode)->wsize; 9591da177e4SLinus Torvalds 960bcb71bbaSTrond Myklebust if (wsize < PAGE_CACHE_SIZE) 961c63c7b05STrond Myklebust nfs_pageio_init(pgio, inode, nfs_flush_multi, wsize, ioflags); 962bcb71bbaSTrond Myklebust else 963c63c7b05STrond Myklebust nfs_pageio_init(pgio, inode, nfs_flush_one, wsize, ioflags); 9641da177e4SLinus Torvalds } 9651da177e4SLinus Torvalds 9661da177e4SLinus Torvalds /* 9671da177e4SLinus Torvalds * Handle a write reply that flushed part of a page. 9681da177e4SLinus Torvalds */ 969788e7a89STrond Myklebust static void nfs_writeback_done_partial(struct rpc_task *task, void *calldata) 9701da177e4SLinus Torvalds { 971788e7a89STrond Myklebust struct nfs_write_data *data = calldata; 9721da177e4SLinus Torvalds struct nfs_page *req = data->req; 9731da177e4SLinus Torvalds struct page *page = req->wb_page; 9741da177e4SLinus Torvalds 9751da177e4SLinus Torvalds dprintk("NFS: write (%s/%Ld %d@%Ld)", 97688be9f99STrond Myklebust req->wb_context->path.dentry->d_inode->i_sb->s_id, 97788be9f99STrond Myklebust (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), 9781da177e4SLinus Torvalds req->wb_bytes, 9791da177e4SLinus Torvalds (long long)req_offset(req)); 9801da177e4SLinus Torvalds 981788e7a89STrond Myklebust if (nfs_writeback_done(task, data) != 0) 982788e7a89STrond Myklebust return; 983788e7a89STrond Myklebust 984788e7a89STrond Myklebust if (task->tk_status < 0) { 985a301b777STrond Myklebust nfs_set_pageerror(page); 9867b159fc1STrond Myklebust nfs_context_set_write_error(req->wb_context, task->tk_status); 987788e7a89STrond Myklebust dprintk(", error = %d\n", task->tk_status); 9888e821cadSTrond Myklebust goto out; 9898e821cadSTrond Myklebust } 9908e821cadSTrond Myklebust 9918e821cadSTrond Myklebust if (nfs_write_need_commit(data)) { 992587142f8STrond Myklebust struct inode *inode = page->mapping->host; 9938e821cadSTrond Myklebust 994587142f8STrond Myklebust spin_lock(&inode->i_lock); 9958e821cadSTrond Myklebust if (test_bit(PG_NEED_RESCHED, &req->wb_flags)) { 9968e821cadSTrond Myklebust /* Do nothing we need to resend the writes */ 9978e821cadSTrond Myklebust } else if (!test_and_set_bit(PG_NEED_COMMIT, &req->wb_flags)) { 9981da177e4SLinus Torvalds memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); 9991da177e4SLinus Torvalds dprintk(" defer commit\n"); 10001da177e4SLinus Torvalds } else if (memcmp(&req->wb_verf, &data->verf, sizeof(req->wb_verf))) { 10018e821cadSTrond Myklebust set_bit(PG_NEED_RESCHED, &req->wb_flags); 10028e821cadSTrond Myklebust clear_bit(PG_NEED_COMMIT, &req->wb_flags); 10031da177e4SLinus Torvalds dprintk(" server reboot detected\n"); 10041da177e4SLinus Torvalds } 1005587142f8STrond Myklebust spin_unlock(&inode->i_lock); 10061da177e4SLinus Torvalds } else 10071da177e4SLinus Torvalds dprintk(" OK\n"); 10081da177e4SLinus Torvalds 10098e821cadSTrond Myklebust out: 10101da177e4SLinus Torvalds if (atomic_dec_and_test(&req->wb_complete)) 10111da177e4SLinus Torvalds nfs_writepage_release(req); 10121da177e4SLinus Torvalds } 10131da177e4SLinus Torvalds 1014788e7a89STrond Myklebust static const struct rpc_call_ops nfs_write_partial_ops = { 1015788e7a89STrond Myklebust .rpc_call_done = nfs_writeback_done_partial, 1016788e7a89STrond Myklebust .rpc_release = nfs_writedata_release, 1017788e7a89STrond Myklebust }; 1018788e7a89STrond Myklebust 10191da177e4SLinus Torvalds /* 10201da177e4SLinus Torvalds * Handle a write reply that flushes a whole page. 10211da177e4SLinus Torvalds * 10221da177e4SLinus Torvalds * FIXME: There is an inherent race with invalidate_inode_pages and 10231da177e4SLinus Torvalds * writebacks since the page->count is kept > 1 for as long 10241da177e4SLinus Torvalds * as the page has a write request pending. 10251da177e4SLinus Torvalds */ 1026788e7a89STrond Myklebust static void nfs_writeback_done_full(struct rpc_task *task, void *calldata) 10271da177e4SLinus Torvalds { 1028788e7a89STrond Myklebust struct nfs_write_data *data = calldata; 10291da177e4SLinus Torvalds struct nfs_page *req; 10301da177e4SLinus Torvalds struct page *page; 10311da177e4SLinus Torvalds 1032788e7a89STrond Myklebust if (nfs_writeback_done(task, data) != 0) 1033788e7a89STrond Myklebust return; 1034788e7a89STrond Myklebust 10351da177e4SLinus Torvalds /* Update attributes as result of writeback. */ 10361da177e4SLinus Torvalds while (!list_empty(&data->pages)) { 10371da177e4SLinus Torvalds req = nfs_list_entry(data->pages.next); 10381da177e4SLinus Torvalds nfs_list_remove_request(req); 10391da177e4SLinus Torvalds page = req->wb_page; 10401da177e4SLinus Torvalds 10411da177e4SLinus Torvalds dprintk("NFS: write (%s/%Ld %d@%Ld)", 104288be9f99STrond Myklebust req->wb_context->path.dentry->d_inode->i_sb->s_id, 104388be9f99STrond Myklebust (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), 10441da177e4SLinus Torvalds req->wb_bytes, 10451da177e4SLinus Torvalds (long long)req_offset(req)); 10461da177e4SLinus Torvalds 1047788e7a89STrond Myklebust if (task->tk_status < 0) { 1048a301b777STrond Myklebust nfs_set_pageerror(page); 10497b159fc1STrond Myklebust nfs_context_set_write_error(req->wb_context, task->tk_status); 1050788e7a89STrond Myklebust dprintk(", error = %d\n", task->tk_status); 10518e821cadSTrond Myklebust goto remove_request; 10521da177e4SLinus Torvalds } 10531da177e4SLinus Torvalds 10548e821cadSTrond Myklebust if (nfs_write_need_commit(data)) { 10551da177e4SLinus Torvalds memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); 10561da177e4SLinus Torvalds nfs_mark_request_commit(req); 10578e821cadSTrond Myklebust nfs_end_page_writeback(page); 10581da177e4SLinus Torvalds dprintk(" marked for commit\n"); 10598e821cadSTrond Myklebust goto next; 10608e821cadSTrond Myklebust } 106144dd151dSTrond Myklebust /* Set the PG_uptodate flag? */ 106244dd151dSTrond Myklebust nfs_mark_uptodate(page, req->wb_pgbase, req->wb_bytes); 10638e821cadSTrond Myklebust dprintk(" OK\n"); 10648e821cadSTrond Myklebust remove_request: 10658e821cadSTrond Myklebust nfs_end_page_writeback(page); 10661da177e4SLinus Torvalds nfs_inode_remove_request(req); 10671da177e4SLinus Torvalds next: 10689fd367f0STrond Myklebust nfs_clear_page_tag_locked(req); 10691da177e4SLinus Torvalds } 10701da177e4SLinus Torvalds } 10711da177e4SLinus Torvalds 1072788e7a89STrond Myklebust static const struct rpc_call_ops nfs_write_full_ops = { 1073788e7a89STrond Myklebust .rpc_call_done = nfs_writeback_done_full, 1074788e7a89STrond Myklebust .rpc_release = nfs_writedata_release, 1075788e7a89STrond Myklebust }; 1076788e7a89STrond Myklebust 1077788e7a89STrond Myklebust 10781da177e4SLinus Torvalds /* 10791da177e4SLinus Torvalds * This function is called when the WRITE call is complete. 10801da177e4SLinus Torvalds */ 1081462d5b32SChuck Lever int nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data) 10821da177e4SLinus Torvalds { 10831da177e4SLinus Torvalds struct nfs_writeargs *argp = &data->args; 10841da177e4SLinus Torvalds struct nfs_writeres *resp = &data->res; 1085788e7a89STrond Myklebust int status; 10861da177e4SLinus Torvalds 1087a3f565b1SChuck Lever dprintk("NFS: %5u nfs_writeback_done (status %d)\n", 10881da177e4SLinus Torvalds task->tk_pid, task->tk_status); 10891da177e4SLinus Torvalds 1090f551e44fSChuck Lever /* 1091f551e44fSChuck Lever * ->write_done will attempt to use post-op attributes to detect 1092f551e44fSChuck Lever * conflicting writes by other clients. A strict interpretation 1093f551e44fSChuck Lever * of close-to-open would allow us to continue caching even if 1094f551e44fSChuck Lever * another writer had changed the file, but some applications 1095f551e44fSChuck Lever * depend on tighter cache coherency when writing. 1096f551e44fSChuck Lever */ 1097788e7a89STrond Myklebust status = NFS_PROTO(data->inode)->write_done(task, data); 1098788e7a89STrond Myklebust if (status != 0) 1099788e7a89STrond Myklebust return status; 110091d5b470SChuck Lever nfs_add_stats(data->inode, NFSIOS_SERVERWRITTENBYTES, resp->count); 110191d5b470SChuck Lever 11021da177e4SLinus Torvalds #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) 11031da177e4SLinus Torvalds if (resp->verf->committed < argp->stable && task->tk_status >= 0) { 11041da177e4SLinus Torvalds /* We tried a write call, but the server did not 11051da177e4SLinus Torvalds * commit data to stable storage even though we 11061da177e4SLinus Torvalds * requested it. 11071da177e4SLinus Torvalds * Note: There is a known bug in Tru64 < 5.0 in which 11081da177e4SLinus Torvalds * the server reports NFS_DATA_SYNC, but performs 11091da177e4SLinus Torvalds * NFS_FILE_SYNC. We therefore implement this checking 11101da177e4SLinus Torvalds * as a dprintk() in order to avoid filling syslog. 11111da177e4SLinus Torvalds */ 11121da177e4SLinus Torvalds static unsigned long complain; 11131da177e4SLinus Torvalds 11141da177e4SLinus Torvalds if (time_before(complain, jiffies)) { 11151da177e4SLinus Torvalds dprintk("NFS: faulty NFS server %s:" 11161da177e4SLinus Torvalds " (committed = %d) != (stable = %d)\n", 111754ceac45SDavid Howells NFS_SERVER(data->inode)->nfs_client->cl_hostname, 11181da177e4SLinus Torvalds resp->verf->committed, argp->stable); 11191da177e4SLinus Torvalds complain = jiffies + 300 * HZ; 11201da177e4SLinus Torvalds } 11211da177e4SLinus Torvalds } 11221da177e4SLinus Torvalds #endif 11231da177e4SLinus Torvalds /* Is this a short write? */ 11241da177e4SLinus Torvalds if (task->tk_status >= 0 && resp->count < argp->count) { 11251da177e4SLinus Torvalds static unsigned long complain; 11261da177e4SLinus Torvalds 112791d5b470SChuck Lever nfs_inc_stats(data->inode, NFSIOS_SHORTWRITE); 112891d5b470SChuck Lever 11291da177e4SLinus Torvalds /* Has the server at least made some progress? */ 11301da177e4SLinus Torvalds if (resp->count != 0) { 11311da177e4SLinus Torvalds /* Was this an NFSv2 write or an NFSv3 stable write? */ 11321da177e4SLinus Torvalds if (resp->verf->committed != NFS_UNSTABLE) { 11331da177e4SLinus Torvalds /* Resend from where the server left off */ 11341da177e4SLinus Torvalds argp->offset += resp->count; 11351da177e4SLinus Torvalds argp->pgbase += resp->count; 11361da177e4SLinus Torvalds argp->count -= resp->count; 11371da177e4SLinus Torvalds } else { 11381da177e4SLinus Torvalds /* Resend as a stable write in order to avoid 11391da177e4SLinus Torvalds * headaches in the case of a server crash. 11401da177e4SLinus Torvalds */ 11411da177e4SLinus Torvalds argp->stable = NFS_FILE_SYNC; 11421da177e4SLinus Torvalds } 11431da177e4SLinus Torvalds rpc_restart_call(task); 1144788e7a89STrond Myklebust return -EAGAIN; 11451da177e4SLinus Torvalds } 11461da177e4SLinus Torvalds if (time_before(complain, jiffies)) { 11471da177e4SLinus Torvalds printk(KERN_WARNING 11481da177e4SLinus Torvalds "NFS: Server wrote zero bytes, expected %u.\n", 11491da177e4SLinus Torvalds argp->count); 11501da177e4SLinus Torvalds complain = jiffies + 300 * HZ; 11511da177e4SLinus Torvalds } 11521da177e4SLinus Torvalds /* Can't do anything about it except throw an error. */ 11531da177e4SLinus Torvalds task->tk_status = -EIO; 11541da177e4SLinus Torvalds } 1155788e7a89STrond Myklebust return 0; 11561da177e4SLinus Torvalds } 11571da177e4SLinus Torvalds 11581da177e4SLinus Torvalds 11591da177e4SLinus Torvalds #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) 1160963d8fe5STrond Myklebust void nfs_commit_release(void *wdata) 11611da177e4SLinus Torvalds { 11621da177e4SLinus Torvalds nfs_commit_free(wdata); 11631da177e4SLinus Torvalds } 11641da177e4SLinus Torvalds 11651da177e4SLinus Torvalds /* 11661da177e4SLinus Torvalds * Set up the argument/result storage required for the RPC call. 11671da177e4SLinus Torvalds */ 11681da177e4SLinus Torvalds static void nfs_commit_rpcsetup(struct list_head *head, 1169788e7a89STrond Myklebust struct nfs_write_data *data, 1170788e7a89STrond Myklebust int how) 11711da177e4SLinus Torvalds { 117284115e1cSTrond Myklebust struct nfs_page *first = nfs_list_entry(head->next); 117384115e1cSTrond Myklebust struct inode *inode = first->wb_context->path.dentry->d_inode; 117484115e1cSTrond Myklebust int flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; 11753ff7576dSTrond Myklebust int priority = flush_task_priority(how); 117607737691STrond Myklebust struct rpc_task *task; 1177bdc7f021STrond Myklebust struct rpc_message msg = { 1178bdc7f021STrond Myklebust .rpc_argp = &data->args, 1179bdc7f021STrond Myklebust .rpc_resp = &data->res, 1180bdc7f021STrond Myklebust .rpc_cred = first->wb_context->cred, 1181bdc7f021STrond Myklebust }; 118284115e1cSTrond Myklebust struct rpc_task_setup task_setup_data = { 118307737691STrond Myklebust .task = &data->task, 118484115e1cSTrond Myklebust .rpc_client = NFS_CLIENT(inode), 1185bdc7f021STrond Myklebust .rpc_message = &msg, 118684115e1cSTrond Myklebust .callback_ops = &nfs_commit_ops, 118784115e1cSTrond Myklebust .callback_data = data, 118884115e1cSTrond Myklebust .flags = flags, 11893ff7576dSTrond Myklebust .priority = priority, 119084115e1cSTrond Myklebust }; 11911da177e4SLinus Torvalds 11921da177e4SLinus Torvalds /* Set up the RPC argument and reply structs 11931da177e4SLinus Torvalds * NB: take care not to mess about with data->commit et al. */ 11941da177e4SLinus Torvalds 11951da177e4SLinus Torvalds list_splice_init(head, &data->pages); 11961da177e4SLinus Torvalds 11971da177e4SLinus Torvalds data->inode = inode; 1198bdc7f021STrond Myklebust data->cred = msg.rpc_cred; 11991da177e4SLinus Torvalds 12001da177e4SLinus Torvalds data->args.fh = NFS_FH(data->inode); 12013da28eb1STrond Myklebust /* Note: we always request a commit of the entire inode */ 12023da28eb1STrond Myklebust data->args.offset = 0; 12033da28eb1STrond Myklebust data->args.count = 0; 12043da28eb1STrond Myklebust data->res.count = 0; 12051da177e4SLinus Torvalds data->res.fattr = &data->fattr; 12061da177e4SLinus Torvalds data->res.verf = &data->verf; 12070e574af1STrond Myklebust nfs_fattr_init(&data->fattr); 12081da177e4SLinus Torvalds 1209788e7a89STrond Myklebust /* Set up the initial task struct. */ 1210bdc7f021STrond Myklebust NFS_PROTO(inode)->commit_setup(data, &msg); 12111da177e4SLinus Torvalds 1212a3f565b1SChuck Lever dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid); 1213bdc7f021STrond Myklebust 121407737691STrond Myklebust task = rpc_run_task(&task_setup_data); 121507737691STrond Myklebust if (!IS_ERR(task)) 121607737691STrond Myklebust rpc_put_task(task); 12171da177e4SLinus Torvalds } 12181da177e4SLinus Torvalds 12191da177e4SLinus Torvalds /* 12201da177e4SLinus Torvalds * Commit dirty pages 12211da177e4SLinus Torvalds */ 12221da177e4SLinus Torvalds static int 122340859d7eSChuck Lever nfs_commit_list(struct inode *inode, struct list_head *head, int how) 12241da177e4SLinus Torvalds { 12251da177e4SLinus Torvalds struct nfs_write_data *data; 12261da177e4SLinus Torvalds struct nfs_page *req; 12271da177e4SLinus Torvalds 1228e9f7bee1STrond Myklebust data = nfs_commit_alloc(); 12291da177e4SLinus Torvalds 12301da177e4SLinus Torvalds if (!data) 12311da177e4SLinus Torvalds goto out_bad; 12321da177e4SLinus Torvalds 12331da177e4SLinus Torvalds /* Set up the argument struct */ 12341da177e4SLinus Torvalds nfs_commit_rpcsetup(head, data, how); 12351da177e4SLinus Torvalds 12361da177e4SLinus Torvalds return 0; 12371da177e4SLinus Torvalds out_bad: 12381da177e4SLinus Torvalds while (!list_empty(head)) { 12391da177e4SLinus Torvalds req = nfs_list_entry(head->next); 12401da177e4SLinus Torvalds nfs_list_remove_request(req); 12411da177e4SLinus Torvalds nfs_mark_request_commit(req); 124283715ad5STrond Myklebust dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); 1243c9e51e41SPeter Zijlstra dec_bdi_stat(req->wb_page->mapping->backing_dev_info, 1244c9e51e41SPeter Zijlstra BDI_RECLAIMABLE); 12459fd367f0STrond Myklebust nfs_clear_page_tag_locked(req); 12461da177e4SLinus Torvalds } 12471da177e4SLinus Torvalds return -ENOMEM; 12481da177e4SLinus Torvalds } 12491da177e4SLinus Torvalds 12501da177e4SLinus Torvalds /* 12511da177e4SLinus Torvalds * COMMIT call returned 12521da177e4SLinus Torvalds */ 1253788e7a89STrond Myklebust static void nfs_commit_done(struct rpc_task *task, void *calldata) 12541da177e4SLinus Torvalds { 1255963d8fe5STrond Myklebust struct nfs_write_data *data = calldata; 12561da177e4SLinus Torvalds struct nfs_page *req; 12571da177e4SLinus Torvalds 1258a3f565b1SChuck Lever dprintk("NFS: %5u nfs_commit_done (status %d)\n", 12591da177e4SLinus Torvalds task->tk_pid, task->tk_status); 12601da177e4SLinus Torvalds 1261788e7a89STrond Myklebust /* Call the NFS version-specific code */ 1262788e7a89STrond Myklebust if (NFS_PROTO(data->inode)->commit_done(task, data) != 0) 1263788e7a89STrond Myklebust return; 1264788e7a89STrond Myklebust 12651da177e4SLinus Torvalds while (!list_empty(&data->pages)) { 12661da177e4SLinus Torvalds req = nfs_list_entry(data->pages.next); 12671da177e4SLinus Torvalds nfs_list_remove_request(req); 1268612c9384STrond Myklebust clear_bit(PG_NEED_COMMIT, &(req)->wb_flags); 1269fd39fc85SChristoph Lameter dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); 1270c9e51e41SPeter Zijlstra dec_bdi_stat(req->wb_page->mapping->backing_dev_info, 1271c9e51e41SPeter Zijlstra BDI_RECLAIMABLE); 12721da177e4SLinus Torvalds 12731da177e4SLinus Torvalds dprintk("NFS: commit (%s/%Ld %d@%Ld)", 127488be9f99STrond Myklebust req->wb_context->path.dentry->d_inode->i_sb->s_id, 127588be9f99STrond Myklebust (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), 12761da177e4SLinus Torvalds req->wb_bytes, 12771da177e4SLinus Torvalds (long long)req_offset(req)); 12781da177e4SLinus Torvalds if (task->tk_status < 0) { 12797b159fc1STrond Myklebust nfs_context_set_write_error(req->wb_context, task->tk_status); 12801da177e4SLinus Torvalds nfs_inode_remove_request(req); 12811da177e4SLinus Torvalds dprintk(", error = %d\n", task->tk_status); 12821da177e4SLinus Torvalds goto next; 12831da177e4SLinus Torvalds } 12841da177e4SLinus Torvalds 12851da177e4SLinus Torvalds /* Okay, COMMIT succeeded, apparently. Check the verifier 12861da177e4SLinus Torvalds * returned by the server against all stored verfs. */ 12871da177e4SLinus Torvalds if (!memcmp(req->wb_verf.verifier, data->verf.verifier, sizeof(data->verf.verifier))) { 12881da177e4SLinus Torvalds /* We have a match */ 128944dd151dSTrond Myklebust /* Set the PG_uptodate flag */ 129044dd151dSTrond Myklebust nfs_mark_uptodate(req->wb_page, req->wb_pgbase, 129144dd151dSTrond Myklebust req->wb_bytes); 12921da177e4SLinus Torvalds nfs_inode_remove_request(req); 12931da177e4SLinus Torvalds dprintk(" OK\n"); 12941da177e4SLinus Torvalds goto next; 12951da177e4SLinus Torvalds } 12961da177e4SLinus Torvalds /* We have a mismatch. Write the page again */ 12971da177e4SLinus Torvalds dprintk(" mismatch\n"); 129861822ab5STrond Myklebust nfs_redirty_request(req); 12991da177e4SLinus Torvalds next: 13009fd367f0STrond Myklebust nfs_clear_page_tag_locked(req); 13011da177e4SLinus Torvalds } 13021da177e4SLinus Torvalds } 1303788e7a89STrond Myklebust 1304788e7a89STrond Myklebust static const struct rpc_call_ops nfs_commit_ops = { 1305788e7a89STrond Myklebust .rpc_call_done = nfs_commit_done, 1306788e7a89STrond Myklebust .rpc_release = nfs_commit_release, 1307788e7a89STrond Myklebust }; 13081da177e4SLinus Torvalds 13093da28eb1STrond Myklebust int nfs_commit_inode(struct inode *inode, int how) 13101da177e4SLinus Torvalds { 13111da177e4SLinus Torvalds LIST_HEAD(head); 13127d46a49fSTrond Myklebust int res; 13131da177e4SLinus Torvalds 1314587142f8STrond Myklebust spin_lock(&inode->i_lock); 13153da28eb1STrond Myklebust res = nfs_scan_commit(inode, &head, 0, 0); 1316587142f8STrond Myklebust spin_unlock(&inode->i_lock); 13171da177e4SLinus Torvalds if (res) { 13187d46a49fSTrond Myklebust int error = nfs_commit_list(inode, &head, how); 13191da177e4SLinus Torvalds if (error < 0) 13201da177e4SLinus Torvalds return error; 13213da28eb1STrond Myklebust } 13221da177e4SLinus Torvalds return res; 13231da177e4SLinus Torvalds } 1324c63c7b05STrond Myklebust #else 1325c63c7b05STrond Myklebust static inline int nfs_commit_list(struct inode *inode, struct list_head *head, int how) 1326c63c7b05STrond Myklebust { 1327c63c7b05STrond Myklebust return 0; 1328c63c7b05STrond Myklebust } 13291da177e4SLinus Torvalds #endif 13301da177e4SLinus Torvalds 13311c75950bSTrond Myklebust long nfs_sync_mapping_wait(struct address_space *mapping, struct writeback_control *wbc, int how) 13321da177e4SLinus Torvalds { 13331c75950bSTrond Myklebust struct inode *inode = mapping->host; 1334ca52fec1STrond Myklebust pgoff_t idx_start, idx_end; 13351c75950bSTrond Myklebust unsigned int npages = 0; 1336c42de9ddSTrond Myklebust LIST_HEAD(head); 133770b9ecbdSTrond Myklebust int nocommit = how & FLUSH_NOCOMMIT; 13383f442547STrond Myklebust long pages, ret; 13391da177e4SLinus Torvalds 13401c75950bSTrond Myklebust /* FIXME */ 13411c75950bSTrond Myklebust if (wbc->range_cyclic) 13421c75950bSTrond Myklebust idx_start = 0; 13431c75950bSTrond Myklebust else { 13441c75950bSTrond Myklebust idx_start = wbc->range_start >> PAGE_CACHE_SHIFT; 13451c75950bSTrond Myklebust idx_end = wbc->range_end >> PAGE_CACHE_SHIFT; 13461c75950bSTrond Myklebust if (idx_end > idx_start) { 1347ca52fec1STrond Myklebust pgoff_t l_npages = 1 + idx_end - idx_start; 13481c75950bSTrond Myklebust npages = l_npages; 13491c75950bSTrond Myklebust if (sizeof(npages) != sizeof(l_npages) && 1350ca52fec1STrond Myklebust (pgoff_t)npages != l_npages) 13511c75950bSTrond Myklebust npages = 0; 13521c75950bSTrond Myklebust } 13531c75950bSTrond Myklebust } 1354c42de9ddSTrond Myklebust how &= ~FLUSH_NOCOMMIT; 1355587142f8STrond Myklebust spin_lock(&inode->i_lock); 13561da177e4SLinus Torvalds do { 1357c42de9ddSTrond Myklebust ret = nfs_wait_on_requests_locked(inode, idx_start, npages); 1358c42de9ddSTrond Myklebust if (ret != 0) 1359c42de9ddSTrond Myklebust continue; 1360c42de9ddSTrond Myklebust if (nocommit) 1361c42de9ddSTrond Myklebust break; 1362d2ccddf0STrond Myklebust pages = nfs_scan_commit(inode, &head, idx_start, npages); 1363724c439cSTrond Myklebust if (pages == 0) 1364c42de9ddSTrond Myklebust break; 1365d2ccddf0STrond Myklebust if (how & FLUSH_INVALIDATE) { 1366587142f8STrond Myklebust spin_unlock(&inode->i_lock); 136783715ad5STrond Myklebust nfs_cancel_commit_list(&head); 1368e8e058e8STrond Myklebust ret = pages; 1369587142f8STrond Myklebust spin_lock(&inode->i_lock); 1370d2ccddf0STrond Myklebust continue; 1371d2ccddf0STrond Myklebust } 1372d2ccddf0STrond Myklebust pages += nfs_scan_commit(inode, &head, 0, 0); 1373587142f8STrond Myklebust spin_unlock(&inode->i_lock); 1374c42de9ddSTrond Myklebust ret = nfs_commit_list(inode, &head, how); 1375587142f8STrond Myklebust spin_lock(&inode->i_lock); 1376587142f8STrond Myklebust 1377c42de9ddSTrond Myklebust } while (ret >= 0); 1378587142f8STrond Myklebust spin_unlock(&inode->i_lock); 1379c42de9ddSTrond Myklebust return ret; 13801da177e4SLinus Torvalds } 13811da177e4SLinus Torvalds 138234901f70STrond Myklebust static int __nfs_write_mapping(struct address_space *mapping, struct writeback_control *wbc, int how) 13831c75950bSTrond Myklebust { 13841c75950bSTrond Myklebust int ret; 13851c75950bSTrond Myklebust 138634901f70STrond Myklebust ret = nfs_writepages(mapping, wbc); 138761822ab5STrond Myklebust if (ret < 0) 138861822ab5STrond Myklebust goto out; 138934901f70STrond Myklebust ret = nfs_sync_mapping_wait(mapping, wbc, how); 1390ed90ef51STrond Myklebust if (ret < 0) 1391ed90ef51STrond Myklebust goto out; 13921c75950bSTrond Myklebust return 0; 139361822ab5STrond Myklebust out: 1394e507d9ebSTrond Myklebust __mark_inode_dirty(mapping->host, I_DIRTY_PAGES); 13951c75950bSTrond Myklebust return ret; 13961c75950bSTrond Myklebust } 13971c75950bSTrond Myklebust 139834901f70STrond Myklebust /* Two pass sync: first using WB_SYNC_NONE, then WB_SYNC_ALL */ 139934901f70STrond Myklebust static int nfs_write_mapping(struct address_space *mapping, int how) 140034901f70STrond Myklebust { 140134901f70STrond Myklebust struct writeback_control wbc = { 140234901f70STrond Myklebust .bdi = mapping->backing_dev_info, 140334901f70STrond Myklebust .sync_mode = WB_SYNC_NONE, 140434901f70STrond Myklebust .nr_to_write = LONG_MAX, 140534901f70STrond Myklebust .for_writepages = 1, 140634901f70STrond Myklebust .range_cyclic = 1, 140734901f70STrond Myklebust }; 140834901f70STrond Myklebust int ret; 140934901f70STrond Myklebust 141034901f70STrond Myklebust ret = __nfs_write_mapping(mapping, &wbc, how); 141134901f70STrond Myklebust if (ret < 0) 141234901f70STrond Myklebust return ret; 141334901f70STrond Myklebust wbc.sync_mode = WB_SYNC_ALL; 141434901f70STrond Myklebust return __nfs_write_mapping(mapping, &wbc, how); 141534901f70STrond Myklebust } 141634901f70STrond Myklebust 1417ed90ef51STrond Myklebust /* 1418ed90ef51STrond Myklebust * flush the inode to disk. 1419ed90ef51STrond Myklebust */ 1420ed90ef51STrond Myklebust int nfs_wb_all(struct inode *inode) 14211c75950bSTrond Myklebust { 1422ed90ef51STrond Myklebust return nfs_write_mapping(inode->i_mapping, 0); 1423ed90ef51STrond Myklebust } 14241c75950bSTrond Myklebust 1425ed90ef51STrond Myklebust int nfs_wb_nocommit(struct inode *inode) 1426ed90ef51STrond Myklebust { 1427ed90ef51STrond Myklebust return nfs_write_mapping(inode->i_mapping, FLUSH_NOCOMMIT); 14281c75950bSTrond Myklebust } 14291c75950bSTrond Myklebust 14301b3b4a1aSTrond Myklebust int nfs_wb_page_cancel(struct inode *inode, struct page *page) 14311b3b4a1aSTrond Myklebust { 14321b3b4a1aSTrond Myklebust struct nfs_page *req; 14331b3b4a1aSTrond Myklebust loff_t range_start = page_offset(page); 14341b3b4a1aSTrond Myklebust loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); 14351b3b4a1aSTrond Myklebust struct writeback_control wbc = { 14361b3b4a1aSTrond Myklebust .bdi = page->mapping->backing_dev_info, 14371b3b4a1aSTrond Myklebust .sync_mode = WB_SYNC_ALL, 14381b3b4a1aSTrond Myklebust .nr_to_write = LONG_MAX, 14391b3b4a1aSTrond Myklebust .range_start = range_start, 14401b3b4a1aSTrond Myklebust .range_end = range_end, 14411b3b4a1aSTrond Myklebust }; 14421b3b4a1aSTrond Myklebust int ret = 0; 14431b3b4a1aSTrond Myklebust 14441b3b4a1aSTrond Myklebust BUG_ON(!PageLocked(page)); 14451b3b4a1aSTrond Myklebust for (;;) { 14461b3b4a1aSTrond Myklebust req = nfs_page_find_request(page); 14471b3b4a1aSTrond Myklebust if (req == NULL) 14481b3b4a1aSTrond Myklebust goto out; 14491b3b4a1aSTrond Myklebust if (test_bit(PG_NEED_COMMIT, &req->wb_flags)) { 14501b3b4a1aSTrond Myklebust nfs_release_request(req); 14511b3b4a1aSTrond Myklebust break; 14521b3b4a1aSTrond Myklebust } 14531b3b4a1aSTrond Myklebust if (nfs_lock_request_dontget(req)) { 14541b3b4a1aSTrond Myklebust nfs_inode_remove_request(req); 14551b3b4a1aSTrond Myklebust /* 14561b3b4a1aSTrond Myklebust * In case nfs_inode_remove_request has marked the 14571b3b4a1aSTrond Myklebust * page as being dirty 14581b3b4a1aSTrond Myklebust */ 14591b3b4a1aSTrond Myklebust cancel_dirty_page(page, PAGE_CACHE_SIZE); 14601b3b4a1aSTrond Myklebust nfs_unlock_request(req); 14611b3b4a1aSTrond Myklebust break; 14621b3b4a1aSTrond Myklebust } 14631b3b4a1aSTrond Myklebust ret = nfs_wait_on_request(req); 14641b3b4a1aSTrond Myklebust if (ret < 0) 14651b3b4a1aSTrond Myklebust goto out; 14661b3b4a1aSTrond Myklebust } 14671b3b4a1aSTrond Myklebust if (!PagePrivate(page)) 14681b3b4a1aSTrond Myklebust return 0; 14691b3b4a1aSTrond Myklebust ret = nfs_sync_mapping_wait(page->mapping, &wbc, FLUSH_INVALIDATE); 14701b3b4a1aSTrond Myklebust out: 14711b3b4a1aSTrond Myklebust return ret; 14721b3b4a1aSTrond Myklebust } 14731b3b4a1aSTrond Myklebust 14745334eb13SAdrian Bunk static int nfs_wb_page_priority(struct inode *inode, struct page *page, 14755334eb13SAdrian Bunk int how) 14761c75950bSTrond Myklebust { 14771c75950bSTrond Myklebust loff_t range_start = page_offset(page); 14781c75950bSTrond Myklebust loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); 14794d770ccfSTrond Myklebust struct writeback_control wbc = { 14804d770ccfSTrond Myklebust .bdi = page->mapping->backing_dev_info, 14814d770ccfSTrond Myklebust .sync_mode = WB_SYNC_ALL, 14824d770ccfSTrond Myklebust .nr_to_write = LONG_MAX, 14834d770ccfSTrond Myklebust .range_start = range_start, 14844d770ccfSTrond Myklebust .range_end = range_end, 14854d770ccfSTrond Myklebust }; 14864d770ccfSTrond Myklebust int ret; 14871c75950bSTrond Myklebust 14884d770ccfSTrond Myklebust BUG_ON(!PageLocked(page)); 1489c63c7b05STrond Myklebust if (clear_page_dirty_for_io(page)) { 14904d770ccfSTrond Myklebust ret = nfs_writepage_locked(page, &wbc); 14914d770ccfSTrond Myklebust if (ret < 0) 14924d770ccfSTrond Myklebust goto out; 14934d770ccfSTrond Myklebust } 1494f40313acSTrond Myklebust if (!PagePrivate(page)) 1495f40313acSTrond Myklebust return 0; 14964d770ccfSTrond Myklebust ret = nfs_sync_mapping_wait(page->mapping, &wbc, how); 14974d770ccfSTrond Myklebust if (ret >= 0) 14984d770ccfSTrond Myklebust return 0; 14994d770ccfSTrond Myklebust out: 1500e507d9ebSTrond Myklebust __mark_inode_dirty(inode, I_DIRTY_PAGES); 15014d770ccfSTrond Myklebust return ret; 15021c75950bSTrond Myklebust } 15031c75950bSTrond Myklebust 15041c75950bSTrond Myklebust /* 15051c75950bSTrond Myklebust * Write back all requests on one page - we do this before reading it. 15061c75950bSTrond Myklebust */ 15071c75950bSTrond Myklebust int nfs_wb_page(struct inode *inode, struct page* page) 15081c75950bSTrond Myklebust { 15094d770ccfSTrond Myklebust return nfs_wb_page_priority(inode, page, FLUSH_STABLE); 15101c75950bSTrond Myklebust } 15111c75950bSTrond Myklebust 1512f7b422b1SDavid Howells int __init nfs_init_writepagecache(void) 15131da177e4SLinus Torvalds { 15141da177e4SLinus Torvalds nfs_wdata_cachep = kmem_cache_create("nfs_write_data", 15151da177e4SLinus Torvalds sizeof(struct nfs_write_data), 15161da177e4SLinus Torvalds 0, SLAB_HWCACHE_ALIGN, 151720c2df83SPaul Mundt NULL); 15181da177e4SLinus Torvalds if (nfs_wdata_cachep == NULL) 15191da177e4SLinus Torvalds return -ENOMEM; 15201da177e4SLinus Torvalds 152193d2341cSMatthew Dobson nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE, 15221da177e4SLinus Torvalds nfs_wdata_cachep); 15231da177e4SLinus Torvalds if (nfs_wdata_mempool == NULL) 15241da177e4SLinus Torvalds return -ENOMEM; 15251da177e4SLinus Torvalds 152693d2341cSMatthew Dobson nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT, 15271da177e4SLinus Torvalds nfs_wdata_cachep); 15281da177e4SLinus Torvalds if (nfs_commit_mempool == NULL) 15291da177e4SLinus Torvalds return -ENOMEM; 15301da177e4SLinus Torvalds 153189a09141SPeter Zijlstra /* 153289a09141SPeter Zijlstra * NFS congestion size, scale with available memory. 153389a09141SPeter Zijlstra * 153489a09141SPeter Zijlstra * 64MB: 8192k 153589a09141SPeter Zijlstra * 128MB: 11585k 153689a09141SPeter Zijlstra * 256MB: 16384k 153789a09141SPeter Zijlstra * 512MB: 23170k 153889a09141SPeter Zijlstra * 1GB: 32768k 153989a09141SPeter Zijlstra * 2GB: 46340k 154089a09141SPeter Zijlstra * 4GB: 65536k 154189a09141SPeter Zijlstra * 8GB: 92681k 154289a09141SPeter Zijlstra * 16GB: 131072k 154389a09141SPeter Zijlstra * 154489a09141SPeter Zijlstra * This allows larger machines to have larger/more transfers. 154589a09141SPeter Zijlstra * Limit the default to 256M 154689a09141SPeter Zijlstra */ 154789a09141SPeter Zijlstra nfs_congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); 154889a09141SPeter Zijlstra if (nfs_congestion_kb > 256*1024) 154989a09141SPeter Zijlstra nfs_congestion_kb = 256*1024; 155089a09141SPeter Zijlstra 15511da177e4SLinus Torvalds return 0; 15521da177e4SLinus Torvalds } 15531da177e4SLinus Torvalds 1554266bee88SDavid Brownell void nfs_destroy_writepagecache(void) 15551da177e4SLinus Torvalds { 15561da177e4SLinus Torvalds mempool_destroy(nfs_commit_mempool); 15571da177e4SLinus Torvalds mempool_destroy(nfs_wdata_mempool); 15581a1d92c1SAlexey Dobriyan kmem_cache_destroy(nfs_wdata_cachep); 15591da177e4SLinus Torvalds } 15601da177e4SLinus Torvalds 1561