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; 17749a70f27STrond Myklebust if (count != PAGE_CACHE_SIZE) 17860945cb7SNate Diller zero_user_page(page, count, PAGE_CACHE_SIZE - count, KM_USER0); 1791da177e4SLinus Torvalds SetPageUptodate(page); 1801da177e4SLinus Torvalds } 1811da177e4SLinus Torvalds 182e21195a7STrond Myklebust static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page, 1831da177e4SLinus Torvalds unsigned int offset, unsigned int count) 1841da177e4SLinus Torvalds { 1851da177e4SLinus Torvalds struct nfs_page *req; 186e21195a7STrond Myklebust int ret; 1871da177e4SLinus Torvalds 188e21195a7STrond Myklebust for (;;) { 189e21195a7STrond Myklebust req = nfs_update_request(ctx, page, offset, count); 190e21195a7STrond Myklebust if (!IS_ERR(req)) 191e21195a7STrond Myklebust break; 192e21195a7STrond Myklebust ret = PTR_ERR(req); 193e21195a7STrond Myklebust if (ret != -EBUSY) 194e21195a7STrond Myklebust return ret; 195e21195a7STrond Myklebust ret = nfs_wb_page(page->mapping->host, page); 196e21195a7STrond Myklebust if (ret != 0) 197e21195a7STrond Myklebust return ret; 198e21195a7STrond Myklebust } 1991da177e4SLinus Torvalds /* Update file length */ 2001da177e4SLinus Torvalds nfs_grow_file(page, offset, count); 2011da177e4SLinus Torvalds nfs_unlock_request(req); 202abd3e641STrond Myklebust return 0; 2031da177e4SLinus Torvalds } 2041da177e4SLinus Torvalds 2051da177e4SLinus Torvalds static int wb_priority(struct writeback_control *wbc) 2061da177e4SLinus Torvalds { 2071da177e4SLinus Torvalds if (wbc->for_reclaim) 208c63c7b05STrond Myklebust return FLUSH_HIGHPRI | FLUSH_STABLE; 2091da177e4SLinus Torvalds if (wbc->for_kupdate) 2101da177e4SLinus Torvalds return FLUSH_LOWPRI; 2111da177e4SLinus Torvalds return 0; 2121da177e4SLinus Torvalds } 2131da177e4SLinus Torvalds 2141da177e4SLinus Torvalds /* 21589a09141SPeter Zijlstra * NFS congestion control 21689a09141SPeter Zijlstra */ 21789a09141SPeter Zijlstra 21889a09141SPeter Zijlstra int nfs_congestion_kb; 21989a09141SPeter Zijlstra 22089a09141SPeter Zijlstra #define NFS_CONGESTION_ON_THRESH (nfs_congestion_kb >> (PAGE_SHIFT-10)) 22189a09141SPeter Zijlstra #define NFS_CONGESTION_OFF_THRESH \ 22289a09141SPeter Zijlstra (NFS_CONGESTION_ON_THRESH - (NFS_CONGESTION_ON_THRESH >> 2)) 22389a09141SPeter Zijlstra 2245a6d41b3STrond Myklebust static int nfs_set_page_writeback(struct page *page) 22589a09141SPeter Zijlstra { 2265a6d41b3STrond Myklebust int ret = test_set_page_writeback(page); 2275a6d41b3STrond Myklebust 2285a6d41b3STrond Myklebust if (!ret) { 22989a09141SPeter Zijlstra struct inode *inode = page->mapping->host; 23089a09141SPeter Zijlstra struct nfs_server *nfss = NFS_SERVER(inode); 23189a09141SPeter Zijlstra 232277866a0SPeter Zijlstra if (atomic_long_inc_return(&nfss->writeback) > 23389a09141SPeter Zijlstra NFS_CONGESTION_ON_THRESH) 23489a09141SPeter Zijlstra set_bdi_congested(&nfss->backing_dev_info, WRITE); 23589a09141SPeter Zijlstra } 2365a6d41b3STrond Myklebust return ret; 23789a09141SPeter Zijlstra } 23889a09141SPeter Zijlstra 23989a09141SPeter Zijlstra static void nfs_end_page_writeback(struct page *page) 24089a09141SPeter Zijlstra { 24189a09141SPeter Zijlstra struct inode *inode = page->mapping->host; 24289a09141SPeter Zijlstra struct nfs_server *nfss = NFS_SERVER(inode); 24389a09141SPeter Zijlstra 24489a09141SPeter Zijlstra end_page_writeback(page); 245c4dc4beeSPeter Zijlstra if (atomic_long_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH) 24689a09141SPeter Zijlstra clear_bdi_congested(&nfss->backing_dev_info, WRITE); 24789a09141SPeter Zijlstra } 24889a09141SPeter Zijlstra 24989a09141SPeter Zijlstra /* 250e261f51fSTrond Myklebust * Find an associated nfs write request, and prepare to flush it out 2519cccef95STrond Myklebust * May return an error if the user signalled nfs_wait_on_request(). 252e261f51fSTrond Myklebust */ 253c63c7b05STrond Myklebust static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio, 254c63c7b05STrond Myklebust struct page *page) 255e261f51fSTrond Myklebust { 256587142f8STrond Myklebust struct inode *inode = page->mapping->host; 257587142f8STrond Myklebust struct nfs_inode *nfsi = NFS_I(inode); 258e261f51fSTrond Myklebust struct nfs_page *req; 259e261f51fSTrond Myklebust int ret; 260e261f51fSTrond Myklebust 261587142f8STrond Myklebust spin_lock(&inode->i_lock); 262e261f51fSTrond Myklebust for(;;) { 263e261f51fSTrond Myklebust req = nfs_page_find_request_locked(page); 264e261f51fSTrond Myklebust if (req == NULL) { 265587142f8STrond Myklebust spin_unlock(&inode->i_lock); 2669cccef95STrond Myklebust return 0; 267e261f51fSTrond Myklebust } 268e261f51fSTrond Myklebust if (nfs_lock_request_dontget(req)) 269e261f51fSTrond Myklebust break; 270e261f51fSTrond Myklebust /* Note: If we hold the page lock, as is the case in nfs_writepage, 271e261f51fSTrond Myklebust * then the call to nfs_lock_request_dontget() will always 272e261f51fSTrond Myklebust * succeed provided that someone hasn't already marked the 273e261f51fSTrond Myklebust * request as dirty (in which case we don't care). 274e261f51fSTrond Myklebust */ 275587142f8STrond Myklebust spin_unlock(&inode->i_lock); 276e261f51fSTrond Myklebust ret = nfs_wait_on_request(req); 277e261f51fSTrond Myklebust nfs_release_request(req); 278e261f51fSTrond Myklebust if (ret != 0) 279e261f51fSTrond Myklebust return ret; 280587142f8STrond Myklebust spin_lock(&inode->i_lock); 281e261f51fSTrond Myklebust } 282612c9384STrond Myklebust if (test_bit(PG_NEED_COMMIT, &req->wb_flags)) { 283612c9384STrond Myklebust /* This request is marked for commit */ 284587142f8STrond Myklebust spin_unlock(&inode->i_lock); 285612c9384STrond Myklebust nfs_unlock_request(req); 286c63c7b05STrond Myklebust nfs_pageio_complete(pgio); 2879cccef95STrond Myklebust return 0; 288612c9384STrond Myklebust } 289c63c7b05STrond Myklebust if (nfs_set_page_writeback(page) != 0) { 290587142f8STrond Myklebust spin_unlock(&inode->i_lock); 291c63c7b05STrond Myklebust BUG(); 292c63c7b05STrond Myklebust } 293c63c7b05STrond Myklebust radix_tree_tag_set(&nfsi->nfs_page_tree, req->wb_index, 2949fd367f0STrond Myklebust NFS_PAGE_TAG_LOCKED); 295587142f8STrond Myklebust spin_unlock(&inode->i_lock); 296c63c7b05STrond Myklebust nfs_pageio_add_request(pgio, req); 2979cccef95STrond Myklebust return 0; 298e261f51fSTrond Myklebust } 299e261f51fSTrond Myklebust 300f758c885STrond Myklebust static int nfs_do_writepage(struct page *page, struct writeback_control *wbc, struct nfs_pageio_descriptor *pgio) 301f758c885STrond Myklebust { 302f758c885STrond Myklebust struct inode *inode = page->mapping->host; 303f758c885STrond Myklebust 304f758c885STrond Myklebust nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE); 305f758c885STrond Myklebust nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1); 306f758c885STrond Myklebust 307f758c885STrond Myklebust nfs_pageio_cond_complete(pgio, page->index); 308f758c885STrond Myklebust return nfs_page_async_flush(pgio, page); 309f758c885STrond Myklebust } 310f758c885STrond Myklebust 311e261f51fSTrond Myklebust /* 3121da177e4SLinus Torvalds * Write an mmapped page to the server. 3131da177e4SLinus Torvalds */ 3144d770ccfSTrond Myklebust static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc) 3151da177e4SLinus Torvalds { 316f758c885STrond Myklebust struct nfs_pageio_descriptor pgio; 317e261f51fSTrond Myklebust int err; 3181da177e4SLinus Torvalds 319f758c885STrond Myklebust nfs_pageio_init_write(&pgio, page->mapping->host, wb_priority(wbc)); 320f758c885STrond Myklebust err = nfs_do_writepage(page, wbc, &pgio); 321f758c885STrond Myklebust nfs_pageio_complete(&pgio); 322f758c885STrond Myklebust if (err < 0) 3234d770ccfSTrond Myklebust return err; 324f758c885STrond Myklebust if (pgio.pg_error < 0) 325f758c885STrond Myklebust return pgio.pg_error; 326f758c885STrond Myklebust return 0; 3274d770ccfSTrond Myklebust } 3284d770ccfSTrond Myklebust 3294d770ccfSTrond Myklebust int nfs_writepage(struct page *page, struct writeback_control *wbc) 3304d770ccfSTrond Myklebust { 331f758c885STrond Myklebust int ret; 3324d770ccfSTrond Myklebust 333f758c885STrond Myklebust ret = nfs_writepage_locked(page, wbc); 3341da177e4SLinus Torvalds unlock_page(page); 335f758c885STrond Myklebust return ret; 336f758c885STrond Myklebust } 337f758c885STrond Myklebust 338f758c885STrond Myklebust static int nfs_writepages_callback(struct page *page, struct writeback_control *wbc, void *data) 339f758c885STrond Myklebust { 340f758c885STrond Myklebust int ret; 341f758c885STrond Myklebust 342f758c885STrond Myklebust ret = nfs_do_writepage(page, wbc, data); 343f758c885STrond Myklebust unlock_page(page); 344f758c885STrond Myklebust return ret; 3451da177e4SLinus Torvalds } 3461da177e4SLinus Torvalds 3471da177e4SLinus Torvalds int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc) 3481da177e4SLinus Torvalds { 3491da177e4SLinus Torvalds struct inode *inode = mapping->host; 350c63c7b05STrond Myklebust struct nfs_pageio_descriptor pgio; 3511da177e4SLinus Torvalds int err; 3521da177e4SLinus Torvalds 35391d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES); 35491d5b470SChuck Lever 355c63c7b05STrond Myklebust nfs_pageio_init_write(&pgio, inode, wb_priority(wbc)); 356f758c885STrond Myklebust err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio); 357c63c7b05STrond Myklebust nfs_pageio_complete(&pgio); 358f758c885STrond Myklebust if (err < 0) 3591da177e4SLinus Torvalds return err; 360f758c885STrond Myklebust if (pgio.pg_error < 0) 361c63c7b05STrond Myklebust return pgio.pg_error; 362c63c7b05STrond Myklebust return 0; 3631da177e4SLinus Torvalds } 3641da177e4SLinus Torvalds 3651da177e4SLinus Torvalds /* 3661da177e4SLinus Torvalds * Insert a write request into an inode 3671da177e4SLinus Torvalds */ 3681da177e4SLinus Torvalds static int nfs_inode_add_request(struct inode *inode, struct nfs_page *req) 3691da177e4SLinus Torvalds { 3701da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 3711da177e4SLinus Torvalds int error; 3721da177e4SLinus Torvalds 3731da177e4SLinus Torvalds error = radix_tree_insert(&nfsi->nfs_page_tree, req->wb_index, req); 3741da177e4SLinus Torvalds BUG_ON(error == -EEXIST); 3751da177e4SLinus Torvalds if (error) 3761da177e4SLinus Torvalds return error; 3771da177e4SLinus Torvalds if (!nfsi->npages) { 3781da177e4SLinus Torvalds igrab(inode); 3791da177e4SLinus Torvalds if (nfs_have_delegation(inode, FMODE_WRITE)) 3801da177e4SLinus Torvalds nfsi->change_attr++; 3811da177e4SLinus Torvalds } 382deb7d638STrond Myklebust SetPagePrivate(req->wb_page); 383277459d2STrond Myklebust set_page_private(req->wb_page, (unsigned long)req); 3841da177e4SLinus Torvalds nfsi->npages++; 385c03b4024STrond Myklebust kref_get(&req->wb_kref); 3861da177e4SLinus Torvalds return 0; 3871da177e4SLinus Torvalds } 3881da177e4SLinus Torvalds 3891da177e4SLinus Torvalds /* 39089a09141SPeter Zijlstra * Remove a write request from an inode 3911da177e4SLinus Torvalds */ 3921da177e4SLinus Torvalds static void nfs_inode_remove_request(struct nfs_page *req) 3931da177e4SLinus Torvalds { 39488be9f99STrond Myklebust struct inode *inode = req->wb_context->path.dentry->d_inode; 3951da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 3961da177e4SLinus Torvalds 3971da177e4SLinus Torvalds BUG_ON (!NFS_WBACK_BUSY(req)); 3981da177e4SLinus Torvalds 399587142f8STrond Myklebust spin_lock(&inode->i_lock); 400277459d2STrond Myklebust set_page_private(req->wb_page, 0); 401deb7d638STrond Myklebust ClearPagePrivate(req->wb_page); 4021da177e4SLinus Torvalds radix_tree_delete(&nfsi->nfs_page_tree, req->wb_index); 4031da177e4SLinus Torvalds nfsi->npages--; 4041da177e4SLinus Torvalds if (!nfsi->npages) { 405587142f8STrond Myklebust spin_unlock(&inode->i_lock); 4061da177e4SLinus Torvalds iput(inode); 4071da177e4SLinus Torvalds } else 408587142f8STrond Myklebust spin_unlock(&inode->i_lock); 4091da177e4SLinus Torvalds nfs_clear_request(req); 4101da177e4SLinus Torvalds nfs_release_request(req); 4111da177e4SLinus Torvalds } 4121da177e4SLinus Torvalds 41361822ab5STrond Myklebust static void 41461822ab5STrond Myklebust nfs_redirty_request(struct nfs_page *req) 41561822ab5STrond Myklebust { 41661822ab5STrond Myklebust __set_page_dirty_nobuffers(req->wb_page); 41761822ab5STrond Myklebust } 41861822ab5STrond Myklebust 4191da177e4SLinus Torvalds /* 4201da177e4SLinus Torvalds * Check if a request is dirty 4211da177e4SLinus Torvalds */ 4221da177e4SLinus Torvalds static inline int 4231da177e4SLinus Torvalds nfs_dirty_request(struct nfs_page *req) 4241da177e4SLinus Torvalds { 4255a6d41b3STrond Myklebust struct page *page = req->wb_page; 4265a6d41b3STrond Myklebust 427612c9384STrond Myklebust if (page == NULL || test_bit(PG_NEED_COMMIT, &req->wb_flags)) 4285a6d41b3STrond Myklebust return 0; 4295a6d41b3STrond Myklebust return !PageWriteback(req->wb_page); 4301da177e4SLinus Torvalds } 4311da177e4SLinus Torvalds 4321da177e4SLinus Torvalds #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) 4331da177e4SLinus Torvalds /* 4341da177e4SLinus Torvalds * Add a request to the inode's commit list. 4351da177e4SLinus Torvalds */ 4361da177e4SLinus Torvalds static void 4371da177e4SLinus Torvalds nfs_mark_request_commit(struct nfs_page *req) 4381da177e4SLinus Torvalds { 43988be9f99STrond Myklebust struct inode *inode = req->wb_context->path.dentry->d_inode; 4401da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 4411da177e4SLinus Torvalds 442587142f8STrond Myklebust spin_lock(&inode->i_lock); 4431da177e4SLinus Torvalds nfsi->ncommit++; 444612c9384STrond Myklebust set_bit(PG_NEED_COMMIT, &(req)->wb_flags); 4455c369683STrond Myklebust radix_tree_tag_set(&nfsi->nfs_page_tree, 4465c369683STrond Myklebust req->wb_index, 4475c369683STrond Myklebust NFS_PAGE_TAG_COMMIT); 448587142f8STrond Myklebust spin_unlock(&inode->i_lock); 449fd39fc85SChristoph Lameter inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); 450*c9e51e41SPeter Zijlstra inc_bdi_stat(req->wb_page->mapping->backing_dev_info, BDI_RECLAIMABLE); 451a1803044STrond Myklebust __mark_inode_dirty(inode, I_DIRTY_DATASYNC); 4521da177e4SLinus Torvalds } 4538e821cadSTrond Myklebust 4548e821cadSTrond Myklebust static inline 4558e821cadSTrond Myklebust int nfs_write_need_commit(struct nfs_write_data *data) 4568e821cadSTrond Myklebust { 4578e821cadSTrond Myklebust return data->verf.committed != NFS_FILE_SYNC; 4588e821cadSTrond Myklebust } 4598e821cadSTrond Myklebust 4608e821cadSTrond Myklebust static inline 4618e821cadSTrond Myklebust int nfs_reschedule_unstable_write(struct nfs_page *req) 4628e821cadSTrond Myklebust { 463612c9384STrond Myklebust if (test_bit(PG_NEED_COMMIT, &req->wb_flags)) { 4648e821cadSTrond Myklebust nfs_mark_request_commit(req); 4658e821cadSTrond Myklebust return 1; 4668e821cadSTrond Myklebust } 4678e821cadSTrond Myklebust if (test_and_clear_bit(PG_NEED_RESCHED, &req->wb_flags)) { 4688e821cadSTrond Myklebust nfs_redirty_request(req); 4698e821cadSTrond Myklebust return 1; 4708e821cadSTrond Myklebust } 4718e821cadSTrond Myklebust return 0; 4728e821cadSTrond Myklebust } 4738e821cadSTrond Myklebust #else 4748e821cadSTrond Myklebust static inline void 4758e821cadSTrond Myklebust nfs_mark_request_commit(struct nfs_page *req) 4768e821cadSTrond Myklebust { 4778e821cadSTrond Myklebust } 4788e821cadSTrond Myklebust 4798e821cadSTrond Myklebust static inline 4808e821cadSTrond Myklebust int nfs_write_need_commit(struct nfs_write_data *data) 4818e821cadSTrond Myklebust { 4828e821cadSTrond Myklebust return 0; 4838e821cadSTrond Myklebust } 4848e821cadSTrond Myklebust 4858e821cadSTrond Myklebust static inline 4868e821cadSTrond Myklebust int nfs_reschedule_unstable_write(struct nfs_page *req) 4878e821cadSTrond Myklebust { 4888e821cadSTrond Myklebust return 0; 4898e821cadSTrond Myklebust } 4901da177e4SLinus Torvalds #endif 4911da177e4SLinus Torvalds 4921da177e4SLinus Torvalds /* 4931da177e4SLinus Torvalds * Wait for a request to complete. 4941da177e4SLinus Torvalds * 4951da177e4SLinus Torvalds * Interruptible by signals only if mounted with intr flag. 4961da177e4SLinus Torvalds */ 497ca52fec1STrond Myklebust static int nfs_wait_on_requests_locked(struct inode *inode, pgoff_t idx_start, unsigned int npages) 4981da177e4SLinus Torvalds { 4991da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 5001da177e4SLinus Torvalds struct nfs_page *req; 501ca52fec1STrond Myklebust pgoff_t idx_end, next; 5021da177e4SLinus Torvalds unsigned int res = 0; 5031da177e4SLinus Torvalds int error; 5041da177e4SLinus Torvalds 5051da177e4SLinus Torvalds if (npages == 0) 5061da177e4SLinus Torvalds idx_end = ~0; 5071da177e4SLinus Torvalds else 5081da177e4SLinus Torvalds idx_end = idx_start + npages - 1; 5091da177e4SLinus Torvalds 5101da177e4SLinus Torvalds next = idx_start; 5119fd367f0STrond Myklebust while (radix_tree_gang_lookup_tag(&nfsi->nfs_page_tree, (void **)&req, next, 1, NFS_PAGE_TAG_LOCKED)) { 5121da177e4SLinus Torvalds if (req->wb_index > idx_end) 5131da177e4SLinus Torvalds break; 5141da177e4SLinus Torvalds 5151da177e4SLinus Torvalds next = req->wb_index + 1; 516c6a556b8STrond Myklebust BUG_ON(!NFS_WBACK_BUSY(req)); 5171da177e4SLinus Torvalds 518c03b4024STrond Myklebust kref_get(&req->wb_kref); 519587142f8STrond Myklebust spin_unlock(&inode->i_lock); 5201da177e4SLinus Torvalds error = nfs_wait_on_request(req); 5211da177e4SLinus Torvalds nfs_release_request(req); 522587142f8STrond Myklebust spin_lock(&inode->i_lock); 5231da177e4SLinus Torvalds if (error < 0) 5241da177e4SLinus Torvalds return error; 5251da177e4SLinus Torvalds res++; 5261da177e4SLinus Torvalds } 5271da177e4SLinus Torvalds return res; 5281da177e4SLinus Torvalds } 5291da177e4SLinus Torvalds 53083715ad5STrond Myklebust static void nfs_cancel_commit_list(struct list_head *head) 53183715ad5STrond Myklebust { 53283715ad5STrond Myklebust struct nfs_page *req; 53383715ad5STrond Myklebust 53483715ad5STrond Myklebust while(!list_empty(head)) { 53583715ad5STrond Myklebust req = nfs_list_entry(head->next); 536b6dff26aSTrond Myklebust dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); 537*c9e51e41SPeter Zijlstra dec_bdi_stat(req->wb_page->mapping->backing_dev_info, 538*c9e51e41SPeter Zijlstra BDI_RECLAIMABLE); 53983715ad5STrond Myklebust nfs_list_remove_request(req); 540612c9384STrond Myklebust clear_bit(PG_NEED_COMMIT, &(req)->wb_flags); 54183715ad5STrond Myklebust nfs_inode_remove_request(req); 542b6dff26aSTrond Myklebust nfs_unlock_request(req); 54383715ad5STrond Myklebust } 54483715ad5STrond Myklebust } 54583715ad5STrond Myklebust 5461da177e4SLinus Torvalds #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) 5471da177e4SLinus Torvalds /* 5481da177e4SLinus Torvalds * nfs_scan_commit - Scan an inode for commit requests 5491da177e4SLinus Torvalds * @inode: NFS inode to scan 5501da177e4SLinus Torvalds * @dst: destination list 5511da177e4SLinus Torvalds * @idx_start: lower bound of page->index to scan. 5521da177e4SLinus Torvalds * @npages: idx_start + npages sets the upper bound to scan. 5531da177e4SLinus Torvalds * 5541da177e4SLinus Torvalds * Moves requests from the inode's 'commit' request list. 5551da177e4SLinus Torvalds * The requests are *not* checked to ensure that they form a contiguous set. 5561da177e4SLinus Torvalds */ 5571da177e4SLinus Torvalds static int 558ca52fec1STrond Myklebust nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, unsigned int npages) 5591da177e4SLinus Torvalds { 5601da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 5613da28eb1STrond Myklebust int res = 0; 5623da28eb1STrond Myklebust 5633da28eb1STrond Myklebust if (nfsi->ncommit != 0) { 5645c369683STrond Myklebust res = nfs_scan_list(nfsi, dst, idx_start, npages, 5655c369683STrond Myklebust NFS_PAGE_TAG_COMMIT); 5661da177e4SLinus Torvalds nfsi->ncommit -= res; 5673da28eb1STrond Myklebust } 5681da177e4SLinus Torvalds return res; 5691da177e4SLinus Torvalds } 570c42de9ddSTrond Myklebust #else 571ca52fec1STrond Myklebust static inline int nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, unsigned int npages) 572c42de9ddSTrond Myklebust { 573c42de9ddSTrond Myklebust return 0; 574c42de9ddSTrond Myklebust } 5751da177e4SLinus Torvalds #endif 5761da177e4SLinus Torvalds 5771da177e4SLinus Torvalds /* 5781da177e4SLinus Torvalds * Try to update any existing write request, or create one if there is none. 5791da177e4SLinus Torvalds * In order to match, the request's credentials must match those of 5801da177e4SLinus Torvalds * the calling process. 5811da177e4SLinus Torvalds * 5821da177e4SLinus Torvalds * Note: Should always be called with the Page Lock held! 5831da177e4SLinus Torvalds */ 5841da177e4SLinus Torvalds static struct nfs_page * nfs_update_request(struct nfs_open_context* ctx, 585e21195a7STrond Myklebust struct page *page, unsigned int offset, unsigned int bytes) 5861da177e4SLinus Torvalds { 58789a09141SPeter Zijlstra struct address_space *mapping = page->mapping; 58889a09141SPeter Zijlstra struct inode *inode = mapping->host; 5891da177e4SLinus Torvalds struct nfs_page *req, *new = NULL; 590ca52fec1STrond Myklebust pgoff_t rqend, end; 5911da177e4SLinus Torvalds 5921da177e4SLinus Torvalds end = offset + bytes; 5931da177e4SLinus Torvalds 5941da177e4SLinus Torvalds for (;;) { 5951da177e4SLinus Torvalds /* Loop over all inode entries and see if we find 5961da177e4SLinus Torvalds * A request for the page we wish to update 5971da177e4SLinus Torvalds */ 598587142f8STrond Myklebust spin_lock(&inode->i_lock); 599277459d2STrond Myklebust req = nfs_page_find_request_locked(page); 6001da177e4SLinus Torvalds if (req) { 6011da177e4SLinus Torvalds if (!nfs_lock_request_dontget(req)) { 6021da177e4SLinus Torvalds int error; 603277459d2STrond Myklebust 604587142f8STrond Myklebust spin_unlock(&inode->i_lock); 6051da177e4SLinus Torvalds error = nfs_wait_on_request(req); 6061da177e4SLinus Torvalds nfs_release_request(req); 6071dd594b2SNeil Brown if (error < 0) { 6081dd594b2SNeil Brown if (new) 6091dd594b2SNeil Brown nfs_release_request(new); 6101da177e4SLinus Torvalds return ERR_PTR(error); 6111dd594b2SNeil Brown } 6121da177e4SLinus Torvalds continue; 6131da177e4SLinus Torvalds } 614587142f8STrond Myklebust spin_unlock(&inode->i_lock); 6151da177e4SLinus Torvalds if (new) 6161da177e4SLinus Torvalds nfs_release_request(new); 6171da177e4SLinus Torvalds break; 6181da177e4SLinus Torvalds } 6191da177e4SLinus Torvalds 6201da177e4SLinus Torvalds if (new) { 6211da177e4SLinus Torvalds int error; 6221da177e4SLinus Torvalds nfs_lock_request_dontget(new); 6231da177e4SLinus Torvalds error = nfs_inode_add_request(inode, new); 6241da177e4SLinus Torvalds if (error) { 625587142f8STrond Myklebust spin_unlock(&inode->i_lock); 6261da177e4SLinus Torvalds nfs_unlock_request(new); 6271da177e4SLinus Torvalds return ERR_PTR(error); 6281da177e4SLinus Torvalds } 629587142f8STrond Myklebust spin_unlock(&inode->i_lock); 6301da177e4SLinus Torvalds return new; 6311da177e4SLinus Torvalds } 632587142f8STrond Myklebust spin_unlock(&inode->i_lock); 6331da177e4SLinus Torvalds 6341da177e4SLinus Torvalds new = nfs_create_request(ctx, inode, page, offset, bytes); 6351da177e4SLinus Torvalds if (IS_ERR(new)) 6361da177e4SLinus Torvalds return new; 6371da177e4SLinus Torvalds } 6381da177e4SLinus Torvalds 6391da177e4SLinus Torvalds /* We have a request for our page. 6401da177e4SLinus Torvalds * If the creds don't match, or the 6411da177e4SLinus Torvalds * page addresses don't match, 6421da177e4SLinus Torvalds * tell the caller to wait on the conflicting 6431da177e4SLinus Torvalds * request. 6441da177e4SLinus Torvalds */ 6451da177e4SLinus Torvalds rqend = req->wb_offset + req->wb_bytes; 6461da177e4SLinus Torvalds if (req->wb_context != ctx 6471da177e4SLinus Torvalds || req->wb_page != page 6481da177e4SLinus Torvalds || !nfs_dirty_request(req) 6491da177e4SLinus Torvalds || offset > rqend || end < req->wb_offset) { 6501da177e4SLinus Torvalds nfs_unlock_request(req); 6511da177e4SLinus Torvalds return ERR_PTR(-EBUSY); 6521da177e4SLinus Torvalds } 6531da177e4SLinus Torvalds 6541da177e4SLinus Torvalds /* Okay, the request matches. Update the region */ 6551da177e4SLinus Torvalds if (offset < req->wb_offset) { 6561da177e4SLinus Torvalds req->wb_offset = offset; 6571da177e4SLinus Torvalds req->wb_pgbase = offset; 6581da177e4SLinus Torvalds req->wb_bytes = rqend - req->wb_offset; 6591da177e4SLinus Torvalds } 6601da177e4SLinus Torvalds 6611da177e4SLinus Torvalds if (end > rqend) 6621da177e4SLinus Torvalds req->wb_bytes = end - req->wb_offset; 6631da177e4SLinus Torvalds 6641da177e4SLinus Torvalds return req; 6651da177e4SLinus Torvalds } 6661da177e4SLinus Torvalds 6671da177e4SLinus Torvalds int nfs_flush_incompatible(struct file *file, struct page *page) 6681da177e4SLinus Torvalds { 669cd3758e3STrond Myklebust struct nfs_open_context *ctx = nfs_file_open_context(file); 6701da177e4SLinus Torvalds struct nfs_page *req; 6711a54533eSTrond Myklebust int do_flush, status; 6721da177e4SLinus Torvalds /* 6731da177e4SLinus Torvalds * Look for a request corresponding to this page. If there 6741da177e4SLinus Torvalds * is one, and it belongs to another file, we flush it out 6751da177e4SLinus Torvalds * before we try to copy anything into the page. Do this 6761da177e4SLinus Torvalds * due to the lack of an ACCESS-type call in NFSv2. 6771da177e4SLinus Torvalds * Also do the same if we find a request from an existing 6781da177e4SLinus Torvalds * dropped page. 6791da177e4SLinus Torvalds */ 6801a54533eSTrond Myklebust do { 681277459d2STrond Myklebust req = nfs_page_find_request(page); 6821a54533eSTrond Myklebust if (req == NULL) 6831a54533eSTrond Myklebust return 0; 6841a54533eSTrond Myklebust do_flush = req->wb_page != page || req->wb_context != ctx 685e261f51fSTrond Myklebust || !nfs_dirty_request(req); 6861da177e4SLinus Torvalds nfs_release_request(req); 6871a54533eSTrond Myklebust if (!do_flush) 6881a54533eSTrond Myklebust return 0; 689277459d2STrond Myklebust status = nfs_wb_page(page->mapping->host, page); 6901a54533eSTrond Myklebust } while (status == 0); 6911a54533eSTrond Myklebust return status; 6921da177e4SLinus Torvalds } 6931da177e4SLinus Torvalds 6941da177e4SLinus Torvalds /* 6951da177e4SLinus Torvalds * Update and possibly write a cached page of an NFS file. 6961da177e4SLinus Torvalds * 6971da177e4SLinus Torvalds * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad 6981da177e4SLinus Torvalds * things with a page scheduled for an RPC call (e.g. invalidate it). 6991da177e4SLinus Torvalds */ 7001da177e4SLinus Torvalds int nfs_updatepage(struct file *file, struct page *page, 7011da177e4SLinus Torvalds unsigned int offset, unsigned int count) 7021da177e4SLinus Torvalds { 703cd3758e3STrond Myklebust struct nfs_open_context *ctx = nfs_file_open_context(file); 7041da177e4SLinus Torvalds struct inode *inode = page->mapping->host; 7051da177e4SLinus Torvalds int status = 0; 7061da177e4SLinus Torvalds 70791d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE); 70891d5b470SChuck Lever 7091da177e4SLinus Torvalds dprintk("NFS: nfs_updatepage(%s/%s %d@%Ld)\n", 71001cce933SJosef "Jeff" Sipek file->f_path.dentry->d_parent->d_name.name, 71101cce933SJosef "Jeff" Sipek file->f_path.dentry->d_name.name, count, 7120bbacc40SChuck Lever (long long)(page_offset(page) +offset)); 7131da177e4SLinus Torvalds 7141da177e4SLinus Torvalds /* If we're not using byte range locks, and we know the page 7151da177e4SLinus Torvalds * is entirely in cache, it may be more efficient to avoid 7161da177e4SLinus Torvalds * fragmenting write requests. 7171da177e4SLinus Torvalds */ 718ab0a3dbeSTrond Myklebust if (PageUptodate(page) && inode->i_flock == NULL && !(file->f_mode & O_SYNC)) { 71949a70f27STrond Myklebust count = max(count + offset, nfs_page_length(page)); 7201da177e4SLinus Torvalds offset = 0; 7211da177e4SLinus Torvalds } 7221da177e4SLinus Torvalds 723e21195a7STrond Myklebust status = nfs_writepage_setup(ctx, page, offset, count); 724e261f51fSTrond Myklebust __set_page_dirty_nobuffers(page); 7251da177e4SLinus Torvalds 7261da177e4SLinus Torvalds dprintk("NFS: nfs_updatepage returns %d (isize %Ld)\n", 7271da177e4SLinus Torvalds status, (long long)i_size_read(inode)); 7281da177e4SLinus Torvalds if (status < 0) 729a301b777STrond Myklebust nfs_set_pageerror(page); 7301da177e4SLinus Torvalds return status; 7311da177e4SLinus Torvalds } 7321da177e4SLinus Torvalds 7331da177e4SLinus Torvalds static void nfs_writepage_release(struct nfs_page *req) 7341da177e4SLinus Torvalds { 7358e821cadSTrond Myklebust 73644dd151dSTrond Myklebust if (PageError(req->wb_page)) { 73744dd151dSTrond Myklebust nfs_end_page_writeback(req->wb_page); 73844dd151dSTrond Myklebust nfs_inode_remove_request(req); 73944dd151dSTrond Myklebust } else if (!nfs_reschedule_unstable_write(req)) { 74044dd151dSTrond Myklebust /* Set the PG_uptodate flag */ 74144dd151dSTrond Myklebust nfs_mark_uptodate(req->wb_page, req->wb_pgbase, req->wb_bytes); 74289a09141SPeter Zijlstra nfs_end_page_writeback(req->wb_page); 7431da177e4SLinus Torvalds nfs_inode_remove_request(req); 7448e821cadSTrond Myklebust } else 7458e821cadSTrond Myklebust nfs_end_page_writeback(req->wb_page); 7469fd367f0STrond Myklebust nfs_clear_page_tag_locked(req); 7471da177e4SLinus Torvalds } 7481da177e4SLinus Torvalds 7491da177e4SLinus Torvalds static inline int flush_task_priority(int how) 7501da177e4SLinus Torvalds { 7511da177e4SLinus Torvalds switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) { 7521da177e4SLinus Torvalds case FLUSH_HIGHPRI: 7531da177e4SLinus Torvalds return RPC_PRIORITY_HIGH; 7541da177e4SLinus Torvalds case FLUSH_LOWPRI: 7551da177e4SLinus Torvalds return RPC_PRIORITY_LOW; 7561da177e4SLinus Torvalds } 7571da177e4SLinus Torvalds return RPC_PRIORITY_NORMAL; 7581da177e4SLinus Torvalds } 7591da177e4SLinus Torvalds 7601da177e4SLinus Torvalds /* 7611da177e4SLinus Torvalds * Set up the argument/result storage required for the RPC call. 7621da177e4SLinus Torvalds */ 7631da177e4SLinus Torvalds static void nfs_write_rpcsetup(struct nfs_page *req, 7641da177e4SLinus Torvalds struct nfs_write_data *data, 765788e7a89STrond Myklebust const struct rpc_call_ops *call_ops, 7661da177e4SLinus Torvalds unsigned int count, unsigned int offset, 7671da177e4SLinus Torvalds int how) 7681da177e4SLinus Torvalds { 7691da177e4SLinus Torvalds struct inode *inode; 770788e7a89STrond Myklebust int flags; 7711da177e4SLinus Torvalds 7721da177e4SLinus Torvalds /* Set up the RPC argument and reply structs 7731da177e4SLinus Torvalds * NB: take care not to mess about with data->commit et al. */ 7741da177e4SLinus Torvalds 7751da177e4SLinus Torvalds data->req = req; 77688be9f99STrond Myklebust data->inode = inode = req->wb_context->path.dentry->d_inode; 7771da177e4SLinus Torvalds data->cred = req->wb_context->cred; 7781da177e4SLinus Torvalds 7791da177e4SLinus Torvalds data->args.fh = NFS_FH(inode); 7801da177e4SLinus Torvalds data->args.offset = req_offset(req) + offset; 7811da177e4SLinus Torvalds data->args.pgbase = req->wb_pgbase + offset; 7821da177e4SLinus Torvalds data->args.pages = data->pagevec; 7831da177e4SLinus Torvalds data->args.count = count; 7841da177e4SLinus Torvalds data->args.context = req->wb_context; 7851da177e4SLinus Torvalds 7861da177e4SLinus Torvalds data->res.fattr = &data->fattr; 7871da177e4SLinus Torvalds data->res.count = count; 7881da177e4SLinus Torvalds data->res.verf = &data->verf; 7890e574af1STrond Myklebust nfs_fattr_init(&data->fattr); 7901da177e4SLinus Torvalds 791788e7a89STrond Myklebust /* Set up the initial task struct. */ 792788e7a89STrond Myklebust flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; 793788e7a89STrond Myklebust rpc_init_task(&data->task, NFS_CLIENT(inode), flags, call_ops, data); 7941da177e4SLinus Torvalds NFS_PROTO(inode)->write_setup(data, how); 7951da177e4SLinus Torvalds 7961da177e4SLinus Torvalds data->task.tk_priority = flush_task_priority(how); 7971da177e4SLinus Torvalds data->task.tk_cookie = (unsigned long)inode; 7981da177e4SLinus Torvalds 799a3f565b1SChuck Lever dprintk("NFS: %5u initiated write call " 800a3f565b1SChuck Lever "(req %s/%Ld, %u bytes @ offset %Lu)\n", 8010bbacc40SChuck Lever data->task.tk_pid, 8021da177e4SLinus Torvalds inode->i_sb->s_id, 8031da177e4SLinus Torvalds (long long)NFS_FILEID(inode), 8041da177e4SLinus Torvalds count, 8051da177e4SLinus Torvalds (unsigned long long)data->args.offset); 8061da177e4SLinus Torvalds } 8071da177e4SLinus Torvalds 8081da177e4SLinus Torvalds static void nfs_execute_write(struct nfs_write_data *data) 8091da177e4SLinus Torvalds { 8101da177e4SLinus Torvalds struct rpc_clnt *clnt = NFS_CLIENT(data->inode); 8111da177e4SLinus Torvalds sigset_t oldset; 8121da177e4SLinus Torvalds 8131da177e4SLinus Torvalds rpc_clnt_sigmask(clnt, &oldset); 8141da177e4SLinus Torvalds rpc_execute(&data->task); 8151da177e4SLinus Torvalds rpc_clnt_sigunmask(clnt, &oldset); 8161da177e4SLinus Torvalds } 8171da177e4SLinus Torvalds 8181da177e4SLinus Torvalds /* 8191da177e4SLinus Torvalds * Generate multiple small requests to write out a single 8201da177e4SLinus Torvalds * contiguous dirty area on one page. 8211da177e4SLinus Torvalds */ 8228d5658c9STrond Myklebust static int nfs_flush_multi(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int how) 8231da177e4SLinus Torvalds { 8241da177e4SLinus Torvalds struct nfs_page *req = nfs_list_entry(head->next); 8251da177e4SLinus Torvalds struct page *page = req->wb_page; 8261da177e4SLinus Torvalds struct nfs_write_data *data; 827e9f7bee1STrond Myklebust size_t wsize = NFS_SERVER(inode)->wsize, nbytes; 828e9f7bee1STrond Myklebust unsigned int offset; 8291da177e4SLinus Torvalds int requests = 0; 8301da177e4SLinus Torvalds LIST_HEAD(list); 8311da177e4SLinus Torvalds 8321da177e4SLinus Torvalds nfs_list_remove_request(req); 8331da177e4SLinus Torvalds 834bcb71bbaSTrond Myklebust nbytes = count; 835e9f7bee1STrond Myklebust do { 836e9f7bee1STrond Myklebust size_t len = min(nbytes, wsize); 837e9f7bee1STrond Myklebust 8388d5658c9STrond Myklebust data = nfs_writedata_alloc(1); 8391da177e4SLinus Torvalds if (!data) 8401da177e4SLinus Torvalds goto out_bad; 8411da177e4SLinus Torvalds list_add(&data->pages, &list); 8421da177e4SLinus Torvalds requests++; 843e9f7bee1STrond Myklebust nbytes -= len; 844e9f7bee1STrond Myklebust } while (nbytes != 0); 8451da177e4SLinus Torvalds atomic_set(&req->wb_complete, requests); 8461da177e4SLinus Torvalds 8471da177e4SLinus Torvalds ClearPageError(page); 8481da177e4SLinus Torvalds offset = 0; 849bcb71bbaSTrond Myklebust nbytes = count; 8501da177e4SLinus Torvalds do { 8511da177e4SLinus Torvalds data = list_entry(list.next, struct nfs_write_data, pages); 8521da177e4SLinus Torvalds list_del_init(&data->pages); 8531da177e4SLinus Torvalds 8541da177e4SLinus Torvalds data->pagevec[0] = page; 8551da177e4SLinus Torvalds 856bcb71bbaSTrond Myklebust if (nbytes < wsize) 857bcb71bbaSTrond Myklebust wsize = nbytes; 858788e7a89STrond Myklebust nfs_write_rpcsetup(req, data, &nfs_write_partial_ops, 859788e7a89STrond Myklebust wsize, offset, how); 8601da177e4SLinus Torvalds offset += wsize; 8611da177e4SLinus Torvalds nbytes -= wsize; 8621da177e4SLinus Torvalds nfs_execute_write(data); 8631da177e4SLinus Torvalds } while (nbytes != 0); 8641da177e4SLinus Torvalds 8651da177e4SLinus Torvalds return 0; 8661da177e4SLinus Torvalds 8671da177e4SLinus Torvalds out_bad: 8681da177e4SLinus Torvalds while (!list_empty(&list)) { 8691da177e4SLinus Torvalds data = list_entry(list.next, struct nfs_write_data, pages); 8701da177e4SLinus Torvalds list_del(&data->pages); 8718aca67f0STrond Myklebust nfs_writedata_release(data); 8721da177e4SLinus Torvalds } 87361822ab5STrond Myklebust nfs_redirty_request(req); 8746d677e35STrond Myklebust nfs_end_page_writeback(req->wb_page); 8759fd367f0STrond Myklebust nfs_clear_page_tag_locked(req); 8761da177e4SLinus Torvalds return -ENOMEM; 8771da177e4SLinus Torvalds } 8781da177e4SLinus Torvalds 8791da177e4SLinus Torvalds /* 8801da177e4SLinus Torvalds * Create an RPC task for the given write request and kick it. 8811da177e4SLinus Torvalds * The page must have been locked by the caller. 8821da177e4SLinus Torvalds * 8831da177e4SLinus Torvalds * It may happen that the page we're passed is not marked dirty. 8841da177e4SLinus Torvalds * This is the case if nfs_updatepage detects a conflicting request 8851da177e4SLinus Torvalds * that has been written but not committed. 8861da177e4SLinus Torvalds */ 8878d5658c9STrond Myklebust static int nfs_flush_one(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int how) 8881da177e4SLinus Torvalds { 8891da177e4SLinus Torvalds struct nfs_page *req; 8901da177e4SLinus Torvalds struct page **pages; 8911da177e4SLinus Torvalds struct nfs_write_data *data; 8921da177e4SLinus Torvalds 8938d5658c9STrond Myklebust data = nfs_writedata_alloc(npages); 8941da177e4SLinus Torvalds if (!data) 8951da177e4SLinus Torvalds goto out_bad; 8961da177e4SLinus Torvalds 8971da177e4SLinus Torvalds pages = data->pagevec; 8981da177e4SLinus Torvalds while (!list_empty(head)) { 8991da177e4SLinus Torvalds req = nfs_list_entry(head->next); 9001da177e4SLinus Torvalds nfs_list_remove_request(req); 9011da177e4SLinus Torvalds nfs_list_add_request(req, &data->pages); 9021da177e4SLinus Torvalds ClearPageError(req->wb_page); 9031da177e4SLinus Torvalds *pages++ = req->wb_page; 9041da177e4SLinus Torvalds } 9051da177e4SLinus Torvalds req = nfs_list_entry(data->pages.next); 9061da177e4SLinus Torvalds 9071da177e4SLinus Torvalds /* Set up the argument struct */ 908788e7a89STrond Myklebust nfs_write_rpcsetup(req, data, &nfs_write_full_ops, count, 0, how); 9091da177e4SLinus Torvalds 9101da177e4SLinus Torvalds nfs_execute_write(data); 9111da177e4SLinus Torvalds return 0; 9121da177e4SLinus Torvalds out_bad: 9131da177e4SLinus Torvalds while (!list_empty(head)) { 91410afec90STrond Myklebust req = nfs_list_entry(head->next); 9151da177e4SLinus Torvalds nfs_list_remove_request(req); 91661822ab5STrond Myklebust nfs_redirty_request(req); 9176d677e35STrond Myklebust nfs_end_page_writeback(req->wb_page); 9189fd367f0STrond Myklebust nfs_clear_page_tag_locked(req); 9191da177e4SLinus Torvalds } 9201da177e4SLinus Torvalds return -ENOMEM; 9211da177e4SLinus Torvalds } 9221da177e4SLinus Torvalds 923c63c7b05STrond Myklebust static void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, 924c63c7b05STrond Myklebust struct inode *inode, int ioflags) 9251da177e4SLinus Torvalds { 9267d46a49fSTrond Myklebust int wsize = NFS_SERVER(inode)->wsize; 9271da177e4SLinus Torvalds 928bcb71bbaSTrond Myklebust if (wsize < PAGE_CACHE_SIZE) 929c63c7b05STrond Myklebust nfs_pageio_init(pgio, inode, nfs_flush_multi, wsize, ioflags); 930bcb71bbaSTrond Myklebust else 931c63c7b05STrond Myklebust nfs_pageio_init(pgio, inode, nfs_flush_one, wsize, ioflags); 9321da177e4SLinus Torvalds } 9331da177e4SLinus Torvalds 9341da177e4SLinus Torvalds /* 9351da177e4SLinus Torvalds * Handle a write reply that flushed part of a page. 9361da177e4SLinus Torvalds */ 937788e7a89STrond Myklebust static void nfs_writeback_done_partial(struct rpc_task *task, void *calldata) 9381da177e4SLinus Torvalds { 939788e7a89STrond Myklebust struct nfs_write_data *data = calldata; 9401da177e4SLinus Torvalds struct nfs_page *req = data->req; 9411da177e4SLinus Torvalds struct page *page = req->wb_page; 9421da177e4SLinus Torvalds 9431da177e4SLinus Torvalds dprintk("NFS: write (%s/%Ld %d@%Ld)", 94488be9f99STrond Myklebust req->wb_context->path.dentry->d_inode->i_sb->s_id, 94588be9f99STrond Myklebust (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), 9461da177e4SLinus Torvalds req->wb_bytes, 9471da177e4SLinus Torvalds (long long)req_offset(req)); 9481da177e4SLinus Torvalds 949788e7a89STrond Myklebust if (nfs_writeback_done(task, data) != 0) 950788e7a89STrond Myklebust return; 951788e7a89STrond Myklebust 952788e7a89STrond Myklebust if (task->tk_status < 0) { 953a301b777STrond Myklebust nfs_set_pageerror(page); 9547b159fc1STrond Myklebust nfs_context_set_write_error(req->wb_context, task->tk_status); 955788e7a89STrond Myklebust dprintk(", error = %d\n", task->tk_status); 9568e821cadSTrond Myklebust goto out; 9578e821cadSTrond Myklebust } 9588e821cadSTrond Myklebust 9598e821cadSTrond Myklebust if (nfs_write_need_commit(data)) { 960587142f8STrond Myklebust struct inode *inode = page->mapping->host; 9618e821cadSTrond Myklebust 962587142f8STrond Myklebust spin_lock(&inode->i_lock); 9638e821cadSTrond Myklebust if (test_bit(PG_NEED_RESCHED, &req->wb_flags)) { 9648e821cadSTrond Myklebust /* Do nothing we need to resend the writes */ 9658e821cadSTrond Myklebust } else if (!test_and_set_bit(PG_NEED_COMMIT, &req->wb_flags)) { 9661da177e4SLinus Torvalds memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); 9671da177e4SLinus Torvalds dprintk(" defer commit\n"); 9681da177e4SLinus Torvalds } else if (memcmp(&req->wb_verf, &data->verf, sizeof(req->wb_verf))) { 9698e821cadSTrond Myklebust set_bit(PG_NEED_RESCHED, &req->wb_flags); 9708e821cadSTrond Myklebust clear_bit(PG_NEED_COMMIT, &req->wb_flags); 9711da177e4SLinus Torvalds dprintk(" server reboot detected\n"); 9721da177e4SLinus Torvalds } 973587142f8STrond Myklebust spin_unlock(&inode->i_lock); 9741da177e4SLinus Torvalds } else 9751da177e4SLinus Torvalds dprintk(" OK\n"); 9761da177e4SLinus Torvalds 9778e821cadSTrond Myklebust out: 9781da177e4SLinus Torvalds if (atomic_dec_and_test(&req->wb_complete)) 9791da177e4SLinus Torvalds nfs_writepage_release(req); 9801da177e4SLinus Torvalds } 9811da177e4SLinus Torvalds 982788e7a89STrond Myklebust static const struct rpc_call_ops nfs_write_partial_ops = { 983788e7a89STrond Myklebust .rpc_call_done = nfs_writeback_done_partial, 984788e7a89STrond Myklebust .rpc_release = nfs_writedata_release, 985788e7a89STrond Myklebust }; 986788e7a89STrond Myklebust 9871da177e4SLinus Torvalds /* 9881da177e4SLinus Torvalds * Handle a write reply that flushes a whole page. 9891da177e4SLinus Torvalds * 9901da177e4SLinus Torvalds * FIXME: There is an inherent race with invalidate_inode_pages and 9911da177e4SLinus Torvalds * writebacks since the page->count is kept > 1 for as long 9921da177e4SLinus Torvalds * as the page has a write request pending. 9931da177e4SLinus Torvalds */ 994788e7a89STrond Myklebust static void nfs_writeback_done_full(struct rpc_task *task, void *calldata) 9951da177e4SLinus Torvalds { 996788e7a89STrond Myklebust struct nfs_write_data *data = calldata; 9971da177e4SLinus Torvalds struct nfs_page *req; 9981da177e4SLinus Torvalds struct page *page; 9991da177e4SLinus Torvalds 1000788e7a89STrond Myklebust if (nfs_writeback_done(task, data) != 0) 1001788e7a89STrond Myklebust return; 1002788e7a89STrond Myklebust 10031da177e4SLinus Torvalds /* Update attributes as result of writeback. */ 10041da177e4SLinus Torvalds while (!list_empty(&data->pages)) { 10051da177e4SLinus Torvalds req = nfs_list_entry(data->pages.next); 10061da177e4SLinus Torvalds nfs_list_remove_request(req); 10071da177e4SLinus Torvalds page = req->wb_page; 10081da177e4SLinus Torvalds 10091da177e4SLinus Torvalds dprintk("NFS: write (%s/%Ld %d@%Ld)", 101088be9f99STrond Myklebust req->wb_context->path.dentry->d_inode->i_sb->s_id, 101188be9f99STrond Myklebust (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), 10121da177e4SLinus Torvalds req->wb_bytes, 10131da177e4SLinus Torvalds (long long)req_offset(req)); 10141da177e4SLinus Torvalds 1015788e7a89STrond Myklebust if (task->tk_status < 0) { 1016a301b777STrond Myklebust nfs_set_pageerror(page); 10177b159fc1STrond Myklebust nfs_context_set_write_error(req->wb_context, task->tk_status); 1018788e7a89STrond Myklebust dprintk(", error = %d\n", task->tk_status); 10198e821cadSTrond Myklebust goto remove_request; 10201da177e4SLinus Torvalds } 10211da177e4SLinus Torvalds 10228e821cadSTrond Myklebust if (nfs_write_need_commit(data)) { 10231da177e4SLinus Torvalds memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); 10241da177e4SLinus Torvalds nfs_mark_request_commit(req); 10258e821cadSTrond Myklebust nfs_end_page_writeback(page); 10261da177e4SLinus Torvalds dprintk(" marked for commit\n"); 10278e821cadSTrond Myklebust goto next; 10288e821cadSTrond Myklebust } 102944dd151dSTrond Myklebust /* Set the PG_uptodate flag? */ 103044dd151dSTrond Myklebust nfs_mark_uptodate(page, req->wb_pgbase, req->wb_bytes); 10318e821cadSTrond Myklebust dprintk(" OK\n"); 10328e821cadSTrond Myklebust remove_request: 10338e821cadSTrond Myklebust nfs_end_page_writeback(page); 10341da177e4SLinus Torvalds nfs_inode_remove_request(req); 10351da177e4SLinus Torvalds next: 10369fd367f0STrond Myklebust nfs_clear_page_tag_locked(req); 10371da177e4SLinus Torvalds } 10381da177e4SLinus Torvalds } 10391da177e4SLinus Torvalds 1040788e7a89STrond Myklebust static const struct rpc_call_ops nfs_write_full_ops = { 1041788e7a89STrond Myklebust .rpc_call_done = nfs_writeback_done_full, 1042788e7a89STrond Myklebust .rpc_release = nfs_writedata_release, 1043788e7a89STrond Myklebust }; 1044788e7a89STrond Myklebust 1045788e7a89STrond Myklebust 10461da177e4SLinus Torvalds /* 10471da177e4SLinus Torvalds * This function is called when the WRITE call is complete. 10481da177e4SLinus Torvalds */ 1049462d5b32SChuck Lever int nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data) 10501da177e4SLinus Torvalds { 10511da177e4SLinus Torvalds struct nfs_writeargs *argp = &data->args; 10521da177e4SLinus Torvalds struct nfs_writeres *resp = &data->res; 1053788e7a89STrond Myklebust int status; 10541da177e4SLinus Torvalds 1055a3f565b1SChuck Lever dprintk("NFS: %5u nfs_writeback_done (status %d)\n", 10561da177e4SLinus Torvalds task->tk_pid, task->tk_status); 10571da177e4SLinus Torvalds 1058f551e44fSChuck Lever /* 1059f551e44fSChuck Lever * ->write_done will attempt to use post-op attributes to detect 1060f551e44fSChuck Lever * conflicting writes by other clients. A strict interpretation 1061f551e44fSChuck Lever * of close-to-open would allow us to continue caching even if 1062f551e44fSChuck Lever * another writer had changed the file, but some applications 1063f551e44fSChuck Lever * depend on tighter cache coherency when writing. 1064f551e44fSChuck Lever */ 1065788e7a89STrond Myklebust status = NFS_PROTO(data->inode)->write_done(task, data); 1066788e7a89STrond Myklebust if (status != 0) 1067788e7a89STrond Myklebust return status; 106891d5b470SChuck Lever nfs_add_stats(data->inode, NFSIOS_SERVERWRITTENBYTES, resp->count); 106991d5b470SChuck Lever 10701da177e4SLinus Torvalds #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) 10711da177e4SLinus Torvalds if (resp->verf->committed < argp->stable && task->tk_status >= 0) { 10721da177e4SLinus Torvalds /* We tried a write call, but the server did not 10731da177e4SLinus Torvalds * commit data to stable storage even though we 10741da177e4SLinus Torvalds * requested it. 10751da177e4SLinus Torvalds * Note: There is a known bug in Tru64 < 5.0 in which 10761da177e4SLinus Torvalds * the server reports NFS_DATA_SYNC, but performs 10771da177e4SLinus Torvalds * NFS_FILE_SYNC. We therefore implement this checking 10781da177e4SLinus Torvalds * as a dprintk() in order to avoid filling syslog. 10791da177e4SLinus Torvalds */ 10801da177e4SLinus Torvalds static unsigned long complain; 10811da177e4SLinus Torvalds 10821da177e4SLinus Torvalds if (time_before(complain, jiffies)) { 10831da177e4SLinus Torvalds dprintk("NFS: faulty NFS server %s:" 10841da177e4SLinus Torvalds " (committed = %d) != (stable = %d)\n", 108554ceac45SDavid Howells NFS_SERVER(data->inode)->nfs_client->cl_hostname, 10861da177e4SLinus Torvalds resp->verf->committed, argp->stable); 10871da177e4SLinus Torvalds complain = jiffies + 300 * HZ; 10881da177e4SLinus Torvalds } 10891da177e4SLinus Torvalds } 10901da177e4SLinus Torvalds #endif 10911da177e4SLinus Torvalds /* Is this a short write? */ 10921da177e4SLinus Torvalds if (task->tk_status >= 0 && resp->count < argp->count) { 10931da177e4SLinus Torvalds static unsigned long complain; 10941da177e4SLinus Torvalds 109591d5b470SChuck Lever nfs_inc_stats(data->inode, NFSIOS_SHORTWRITE); 109691d5b470SChuck Lever 10971da177e4SLinus Torvalds /* Has the server at least made some progress? */ 10981da177e4SLinus Torvalds if (resp->count != 0) { 10991da177e4SLinus Torvalds /* Was this an NFSv2 write or an NFSv3 stable write? */ 11001da177e4SLinus Torvalds if (resp->verf->committed != NFS_UNSTABLE) { 11011da177e4SLinus Torvalds /* Resend from where the server left off */ 11021da177e4SLinus Torvalds argp->offset += resp->count; 11031da177e4SLinus Torvalds argp->pgbase += resp->count; 11041da177e4SLinus Torvalds argp->count -= resp->count; 11051da177e4SLinus Torvalds } else { 11061da177e4SLinus Torvalds /* Resend as a stable write in order to avoid 11071da177e4SLinus Torvalds * headaches in the case of a server crash. 11081da177e4SLinus Torvalds */ 11091da177e4SLinus Torvalds argp->stable = NFS_FILE_SYNC; 11101da177e4SLinus Torvalds } 11111da177e4SLinus Torvalds rpc_restart_call(task); 1112788e7a89STrond Myklebust return -EAGAIN; 11131da177e4SLinus Torvalds } 11141da177e4SLinus Torvalds if (time_before(complain, jiffies)) { 11151da177e4SLinus Torvalds printk(KERN_WARNING 11161da177e4SLinus Torvalds "NFS: Server wrote zero bytes, expected %u.\n", 11171da177e4SLinus Torvalds argp->count); 11181da177e4SLinus Torvalds complain = jiffies + 300 * HZ; 11191da177e4SLinus Torvalds } 11201da177e4SLinus Torvalds /* Can't do anything about it except throw an error. */ 11211da177e4SLinus Torvalds task->tk_status = -EIO; 11221da177e4SLinus Torvalds } 1123788e7a89STrond Myklebust return 0; 11241da177e4SLinus Torvalds } 11251da177e4SLinus Torvalds 11261da177e4SLinus Torvalds 11271da177e4SLinus Torvalds #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) 1128963d8fe5STrond Myklebust void nfs_commit_release(void *wdata) 11291da177e4SLinus Torvalds { 11301da177e4SLinus Torvalds nfs_commit_free(wdata); 11311da177e4SLinus Torvalds } 11321da177e4SLinus Torvalds 11331da177e4SLinus Torvalds /* 11341da177e4SLinus Torvalds * Set up the argument/result storage required for the RPC call. 11351da177e4SLinus Torvalds */ 11361da177e4SLinus Torvalds static void nfs_commit_rpcsetup(struct list_head *head, 1137788e7a89STrond Myklebust struct nfs_write_data *data, 1138788e7a89STrond Myklebust int how) 11391da177e4SLinus Torvalds { 11403da28eb1STrond Myklebust struct nfs_page *first; 11411da177e4SLinus Torvalds struct inode *inode; 1142788e7a89STrond Myklebust int flags; 11431da177e4SLinus Torvalds 11441da177e4SLinus Torvalds /* Set up the RPC argument and reply structs 11451da177e4SLinus Torvalds * NB: take care not to mess about with data->commit et al. */ 11461da177e4SLinus Torvalds 11471da177e4SLinus Torvalds list_splice_init(head, &data->pages); 11481da177e4SLinus Torvalds first = nfs_list_entry(data->pages.next); 114988be9f99STrond Myklebust inode = first->wb_context->path.dentry->d_inode; 11501da177e4SLinus Torvalds 11511da177e4SLinus Torvalds data->inode = inode; 11521da177e4SLinus Torvalds data->cred = first->wb_context->cred; 11531da177e4SLinus Torvalds 11541da177e4SLinus Torvalds data->args.fh = NFS_FH(data->inode); 11553da28eb1STrond Myklebust /* Note: we always request a commit of the entire inode */ 11563da28eb1STrond Myklebust data->args.offset = 0; 11573da28eb1STrond Myklebust data->args.count = 0; 11583da28eb1STrond Myklebust data->res.count = 0; 11591da177e4SLinus Torvalds data->res.fattr = &data->fattr; 11601da177e4SLinus Torvalds data->res.verf = &data->verf; 11610e574af1STrond Myklebust nfs_fattr_init(&data->fattr); 11621da177e4SLinus Torvalds 1163788e7a89STrond Myklebust /* Set up the initial task struct. */ 1164788e7a89STrond Myklebust flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; 1165788e7a89STrond Myklebust rpc_init_task(&data->task, NFS_CLIENT(inode), flags, &nfs_commit_ops, data); 11661da177e4SLinus Torvalds NFS_PROTO(inode)->commit_setup(data, how); 11671da177e4SLinus Torvalds 11681da177e4SLinus Torvalds data->task.tk_priority = flush_task_priority(how); 11691da177e4SLinus Torvalds data->task.tk_cookie = (unsigned long)inode; 11701da177e4SLinus Torvalds 1171a3f565b1SChuck Lever dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid); 11721da177e4SLinus Torvalds } 11731da177e4SLinus Torvalds 11741da177e4SLinus Torvalds /* 11751da177e4SLinus Torvalds * Commit dirty pages 11761da177e4SLinus Torvalds */ 11771da177e4SLinus Torvalds static int 117840859d7eSChuck Lever nfs_commit_list(struct inode *inode, struct list_head *head, int how) 11791da177e4SLinus Torvalds { 11801da177e4SLinus Torvalds struct nfs_write_data *data; 11811da177e4SLinus Torvalds struct nfs_page *req; 11821da177e4SLinus Torvalds 1183e9f7bee1STrond Myklebust data = nfs_commit_alloc(); 11841da177e4SLinus Torvalds 11851da177e4SLinus Torvalds if (!data) 11861da177e4SLinus Torvalds goto out_bad; 11871da177e4SLinus Torvalds 11881da177e4SLinus Torvalds /* Set up the argument struct */ 11891da177e4SLinus Torvalds nfs_commit_rpcsetup(head, data, how); 11901da177e4SLinus Torvalds 11911da177e4SLinus Torvalds nfs_execute_write(data); 11921da177e4SLinus Torvalds return 0; 11931da177e4SLinus Torvalds out_bad: 11941da177e4SLinus Torvalds while (!list_empty(head)) { 11951da177e4SLinus Torvalds req = nfs_list_entry(head->next); 11961da177e4SLinus Torvalds nfs_list_remove_request(req); 11971da177e4SLinus Torvalds nfs_mark_request_commit(req); 119883715ad5STrond Myklebust dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); 1199*c9e51e41SPeter Zijlstra dec_bdi_stat(req->wb_page->mapping->backing_dev_info, 1200*c9e51e41SPeter Zijlstra BDI_RECLAIMABLE); 12019fd367f0STrond Myklebust nfs_clear_page_tag_locked(req); 12021da177e4SLinus Torvalds } 12031da177e4SLinus Torvalds return -ENOMEM; 12041da177e4SLinus Torvalds } 12051da177e4SLinus Torvalds 12061da177e4SLinus Torvalds /* 12071da177e4SLinus Torvalds * COMMIT call returned 12081da177e4SLinus Torvalds */ 1209788e7a89STrond Myklebust static void nfs_commit_done(struct rpc_task *task, void *calldata) 12101da177e4SLinus Torvalds { 1211963d8fe5STrond Myklebust struct nfs_write_data *data = calldata; 12121da177e4SLinus Torvalds struct nfs_page *req; 12131da177e4SLinus Torvalds 1214a3f565b1SChuck Lever dprintk("NFS: %5u nfs_commit_done (status %d)\n", 12151da177e4SLinus Torvalds task->tk_pid, task->tk_status); 12161da177e4SLinus Torvalds 1217788e7a89STrond Myklebust /* Call the NFS version-specific code */ 1218788e7a89STrond Myklebust if (NFS_PROTO(data->inode)->commit_done(task, data) != 0) 1219788e7a89STrond Myklebust return; 1220788e7a89STrond Myklebust 12211da177e4SLinus Torvalds while (!list_empty(&data->pages)) { 12221da177e4SLinus Torvalds req = nfs_list_entry(data->pages.next); 12231da177e4SLinus Torvalds nfs_list_remove_request(req); 1224612c9384STrond Myklebust clear_bit(PG_NEED_COMMIT, &(req)->wb_flags); 1225fd39fc85SChristoph Lameter dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); 1226*c9e51e41SPeter Zijlstra dec_bdi_stat(req->wb_page->mapping->backing_dev_info, 1227*c9e51e41SPeter Zijlstra BDI_RECLAIMABLE); 12281da177e4SLinus Torvalds 12291da177e4SLinus Torvalds dprintk("NFS: commit (%s/%Ld %d@%Ld)", 123088be9f99STrond Myklebust req->wb_context->path.dentry->d_inode->i_sb->s_id, 123188be9f99STrond Myklebust (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), 12321da177e4SLinus Torvalds req->wb_bytes, 12331da177e4SLinus Torvalds (long long)req_offset(req)); 12341da177e4SLinus Torvalds if (task->tk_status < 0) { 12357b159fc1STrond Myklebust nfs_context_set_write_error(req->wb_context, task->tk_status); 12361da177e4SLinus Torvalds nfs_inode_remove_request(req); 12371da177e4SLinus Torvalds dprintk(", error = %d\n", task->tk_status); 12381da177e4SLinus Torvalds goto next; 12391da177e4SLinus Torvalds } 12401da177e4SLinus Torvalds 12411da177e4SLinus Torvalds /* Okay, COMMIT succeeded, apparently. Check the verifier 12421da177e4SLinus Torvalds * returned by the server against all stored verfs. */ 12431da177e4SLinus Torvalds if (!memcmp(req->wb_verf.verifier, data->verf.verifier, sizeof(data->verf.verifier))) { 12441da177e4SLinus Torvalds /* We have a match */ 124544dd151dSTrond Myklebust /* Set the PG_uptodate flag */ 124644dd151dSTrond Myklebust nfs_mark_uptodate(req->wb_page, req->wb_pgbase, 124744dd151dSTrond Myklebust req->wb_bytes); 12481da177e4SLinus Torvalds nfs_inode_remove_request(req); 12491da177e4SLinus Torvalds dprintk(" OK\n"); 12501da177e4SLinus Torvalds goto next; 12511da177e4SLinus Torvalds } 12521da177e4SLinus Torvalds /* We have a mismatch. Write the page again */ 12531da177e4SLinus Torvalds dprintk(" mismatch\n"); 125461822ab5STrond Myklebust nfs_redirty_request(req); 12551da177e4SLinus Torvalds next: 12569fd367f0STrond Myklebust nfs_clear_page_tag_locked(req); 12571da177e4SLinus Torvalds } 12581da177e4SLinus Torvalds } 1259788e7a89STrond Myklebust 1260788e7a89STrond Myklebust static const struct rpc_call_ops nfs_commit_ops = { 1261788e7a89STrond Myklebust .rpc_call_done = nfs_commit_done, 1262788e7a89STrond Myklebust .rpc_release = nfs_commit_release, 1263788e7a89STrond Myklebust }; 12641da177e4SLinus Torvalds 12653da28eb1STrond Myklebust int nfs_commit_inode(struct inode *inode, int how) 12661da177e4SLinus Torvalds { 12671da177e4SLinus Torvalds LIST_HEAD(head); 12687d46a49fSTrond Myklebust int res; 12691da177e4SLinus Torvalds 1270587142f8STrond Myklebust spin_lock(&inode->i_lock); 12713da28eb1STrond Myklebust res = nfs_scan_commit(inode, &head, 0, 0); 1272587142f8STrond Myklebust spin_unlock(&inode->i_lock); 12731da177e4SLinus Torvalds if (res) { 12747d46a49fSTrond Myklebust int error = nfs_commit_list(inode, &head, how); 12751da177e4SLinus Torvalds if (error < 0) 12761da177e4SLinus Torvalds return error; 12773da28eb1STrond Myklebust } 12781da177e4SLinus Torvalds return res; 12791da177e4SLinus Torvalds } 1280c63c7b05STrond Myklebust #else 1281c63c7b05STrond Myklebust static inline int nfs_commit_list(struct inode *inode, struct list_head *head, int how) 1282c63c7b05STrond Myklebust { 1283c63c7b05STrond Myklebust return 0; 1284c63c7b05STrond Myklebust } 12851da177e4SLinus Torvalds #endif 12861da177e4SLinus Torvalds 12871c75950bSTrond Myklebust long nfs_sync_mapping_wait(struct address_space *mapping, struct writeback_control *wbc, int how) 12881da177e4SLinus Torvalds { 12891c75950bSTrond Myklebust struct inode *inode = mapping->host; 1290ca52fec1STrond Myklebust pgoff_t idx_start, idx_end; 12911c75950bSTrond Myklebust unsigned int npages = 0; 1292c42de9ddSTrond Myklebust LIST_HEAD(head); 129370b9ecbdSTrond Myklebust int nocommit = how & FLUSH_NOCOMMIT; 12943f442547STrond Myklebust long pages, ret; 12951da177e4SLinus Torvalds 12961c75950bSTrond Myklebust /* FIXME */ 12971c75950bSTrond Myklebust if (wbc->range_cyclic) 12981c75950bSTrond Myklebust idx_start = 0; 12991c75950bSTrond Myklebust else { 13001c75950bSTrond Myklebust idx_start = wbc->range_start >> PAGE_CACHE_SHIFT; 13011c75950bSTrond Myklebust idx_end = wbc->range_end >> PAGE_CACHE_SHIFT; 13021c75950bSTrond Myklebust if (idx_end > idx_start) { 1303ca52fec1STrond Myklebust pgoff_t l_npages = 1 + idx_end - idx_start; 13041c75950bSTrond Myklebust npages = l_npages; 13051c75950bSTrond Myklebust if (sizeof(npages) != sizeof(l_npages) && 1306ca52fec1STrond Myklebust (pgoff_t)npages != l_npages) 13071c75950bSTrond Myklebust npages = 0; 13081c75950bSTrond Myklebust } 13091c75950bSTrond Myklebust } 1310c42de9ddSTrond Myklebust how &= ~FLUSH_NOCOMMIT; 1311587142f8STrond Myklebust spin_lock(&inode->i_lock); 13121da177e4SLinus Torvalds do { 1313c42de9ddSTrond Myklebust ret = nfs_wait_on_requests_locked(inode, idx_start, npages); 1314c42de9ddSTrond Myklebust if (ret != 0) 1315c42de9ddSTrond Myklebust continue; 1316c42de9ddSTrond Myklebust if (nocommit) 1317c42de9ddSTrond Myklebust break; 1318d2ccddf0STrond Myklebust pages = nfs_scan_commit(inode, &head, idx_start, npages); 1319724c439cSTrond Myklebust if (pages == 0) 1320c42de9ddSTrond Myklebust break; 1321d2ccddf0STrond Myklebust if (how & FLUSH_INVALIDATE) { 1322587142f8STrond Myklebust spin_unlock(&inode->i_lock); 132383715ad5STrond Myklebust nfs_cancel_commit_list(&head); 1324e8e058e8STrond Myklebust ret = pages; 1325587142f8STrond Myklebust spin_lock(&inode->i_lock); 1326d2ccddf0STrond Myklebust continue; 1327d2ccddf0STrond Myklebust } 1328d2ccddf0STrond Myklebust pages += nfs_scan_commit(inode, &head, 0, 0); 1329587142f8STrond Myklebust spin_unlock(&inode->i_lock); 1330c42de9ddSTrond Myklebust ret = nfs_commit_list(inode, &head, how); 1331587142f8STrond Myklebust spin_lock(&inode->i_lock); 1332587142f8STrond Myklebust 1333c42de9ddSTrond Myklebust } while (ret >= 0); 1334587142f8STrond Myklebust spin_unlock(&inode->i_lock); 1335c42de9ddSTrond Myklebust return ret; 13361da177e4SLinus Torvalds } 13371da177e4SLinus Torvalds 133834901f70STrond Myklebust static int __nfs_write_mapping(struct address_space *mapping, struct writeback_control *wbc, int how) 13391c75950bSTrond Myklebust { 13401c75950bSTrond Myklebust int ret; 13411c75950bSTrond Myklebust 134234901f70STrond Myklebust ret = nfs_writepages(mapping, wbc); 134361822ab5STrond Myklebust if (ret < 0) 134461822ab5STrond Myklebust goto out; 134534901f70STrond Myklebust ret = nfs_sync_mapping_wait(mapping, wbc, how); 1346ed90ef51STrond Myklebust if (ret < 0) 1347ed90ef51STrond Myklebust goto out; 13481c75950bSTrond Myklebust return 0; 134961822ab5STrond Myklebust out: 1350e507d9ebSTrond Myklebust __mark_inode_dirty(mapping->host, I_DIRTY_PAGES); 13511c75950bSTrond Myklebust return ret; 13521c75950bSTrond Myklebust } 13531c75950bSTrond Myklebust 135434901f70STrond Myklebust /* Two pass sync: first using WB_SYNC_NONE, then WB_SYNC_ALL */ 135534901f70STrond Myklebust static int nfs_write_mapping(struct address_space *mapping, int how) 135634901f70STrond Myklebust { 135734901f70STrond Myklebust struct writeback_control wbc = { 135834901f70STrond Myklebust .bdi = mapping->backing_dev_info, 135934901f70STrond Myklebust .sync_mode = WB_SYNC_NONE, 136034901f70STrond Myklebust .nr_to_write = LONG_MAX, 136134901f70STrond Myklebust .for_writepages = 1, 136234901f70STrond Myklebust .range_cyclic = 1, 136334901f70STrond Myklebust }; 136434901f70STrond Myklebust int ret; 136534901f70STrond Myklebust 136634901f70STrond Myklebust ret = __nfs_write_mapping(mapping, &wbc, how); 136734901f70STrond Myklebust if (ret < 0) 136834901f70STrond Myklebust return ret; 136934901f70STrond Myklebust wbc.sync_mode = WB_SYNC_ALL; 137034901f70STrond Myklebust return __nfs_write_mapping(mapping, &wbc, how); 137134901f70STrond Myklebust } 137234901f70STrond Myklebust 1373ed90ef51STrond Myklebust /* 1374ed90ef51STrond Myklebust * flush the inode to disk. 1375ed90ef51STrond Myklebust */ 1376ed90ef51STrond Myklebust int nfs_wb_all(struct inode *inode) 13771c75950bSTrond Myklebust { 1378ed90ef51STrond Myklebust return nfs_write_mapping(inode->i_mapping, 0); 1379ed90ef51STrond Myklebust } 13801c75950bSTrond Myklebust 1381ed90ef51STrond Myklebust int nfs_wb_nocommit(struct inode *inode) 1382ed90ef51STrond Myklebust { 1383ed90ef51STrond Myklebust return nfs_write_mapping(inode->i_mapping, FLUSH_NOCOMMIT); 13841c75950bSTrond Myklebust } 13851c75950bSTrond Myklebust 13861b3b4a1aSTrond Myklebust int nfs_wb_page_cancel(struct inode *inode, struct page *page) 13871b3b4a1aSTrond Myklebust { 13881b3b4a1aSTrond Myklebust struct nfs_page *req; 13891b3b4a1aSTrond Myklebust loff_t range_start = page_offset(page); 13901b3b4a1aSTrond Myklebust loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); 13911b3b4a1aSTrond Myklebust struct writeback_control wbc = { 13921b3b4a1aSTrond Myklebust .bdi = page->mapping->backing_dev_info, 13931b3b4a1aSTrond Myklebust .sync_mode = WB_SYNC_ALL, 13941b3b4a1aSTrond Myklebust .nr_to_write = LONG_MAX, 13951b3b4a1aSTrond Myklebust .range_start = range_start, 13961b3b4a1aSTrond Myklebust .range_end = range_end, 13971b3b4a1aSTrond Myklebust }; 13981b3b4a1aSTrond Myklebust int ret = 0; 13991b3b4a1aSTrond Myklebust 14001b3b4a1aSTrond Myklebust BUG_ON(!PageLocked(page)); 14011b3b4a1aSTrond Myklebust for (;;) { 14021b3b4a1aSTrond Myklebust req = nfs_page_find_request(page); 14031b3b4a1aSTrond Myklebust if (req == NULL) 14041b3b4a1aSTrond Myklebust goto out; 14051b3b4a1aSTrond Myklebust if (test_bit(PG_NEED_COMMIT, &req->wb_flags)) { 14061b3b4a1aSTrond Myklebust nfs_release_request(req); 14071b3b4a1aSTrond Myklebust break; 14081b3b4a1aSTrond Myklebust } 14091b3b4a1aSTrond Myklebust if (nfs_lock_request_dontget(req)) { 14101b3b4a1aSTrond Myklebust nfs_inode_remove_request(req); 14111b3b4a1aSTrond Myklebust /* 14121b3b4a1aSTrond Myklebust * In case nfs_inode_remove_request has marked the 14131b3b4a1aSTrond Myklebust * page as being dirty 14141b3b4a1aSTrond Myklebust */ 14151b3b4a1aSTrond Myklebust cancel_dirty_page(page, PAGE_CACHE_SIZE); 14161b3b4a1aSTrond Myklebust nfs_unlock_request(req); 14171b3b4a1aSTrond Myklebust break; 14181b3b4a1aSTrond Myklebust } 14191b3b4a1aSTrond Myklebust ret = nfs_wait_on_request(req); 14201b3b4a1aSTrond Myklebust if (ret < 0) 14211b3b4a1aSTrond Myklebust goto out; 14221b3b4a1aSTrond Myklebust } 14231b3b4a1aSTrond Myklebust if (!PagePrivate(page)) 14241b3b4a1aSTrond Myklebust return 0; 14251b3b4a1aSTrond Myklebust ret = nfs_sync_mapping_wait(page->mapping, &wbc, FLUSH_INVALIDATE); 14261b3b4a1aSTrond Myklebust out: 14271b3b4a1aSTrond Myklebust return ret; 14281b3b4a1aSTrond Myklebust } 14291b3b4a1aSTrond Myklebust 143061822ab5STrond Myklebust int nfs_wb_page_priority(struct inode *inode, struct page *page, int how) 14311c75950bSTrond Myklebust { 14321c75950bSTrond Myklebust loff_t range_start = page_offset(page); 14331c75950bSTrond Myklebust loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); 14344d770ccfSTrond Myklebust struct writeback_control wbc = { 14354d770ccfSTrond Myklebust .bdi = page->mapping->backing_dev_info, 14364d770ccfSTrond Myklebust .sync_mode = WB_SYNC_ALL, 14374d770ccfSTrond Myklebust .nr_to_write = LONG_MAX, 14384d770ccfSTrond Myklebust .range_start = range_start, 14394d770ccfSTrond Myklebust .range_end = range_end, 14404d770ccfSTrond Myklebust }; 14414d770ccfSTrond Myklebust int ret; 14421c75950bSTrond Myklebust 14434d770ccfSTrond Myklebust BUG_ON(!PageLocked(page)); 1444c63c7b05STrond Myklebust if (clear_page_dirty_for_io(page)) { 14454d770ccfSTrond Myklebust ret = nfs_writepage_locked(page, &wbc); 14464d770ccfSTrond Myklebust if (ret < 0) 14474d770ccfSTrond Myklebust goto out; 14484d770ccfSTrond Myklebust } 1449f40313acSTrond Myklebust if (!PagePrivate(page)) 1450f40313acSTrond Myklebust return 0; 14514d770ccfSTrond Myklebust ret = nfs_sync_mapping_wait(page->mapping, &wbc, how); 14524d770ccfSTrond Myklebust if (ret >= 0) 14534d770ccfSTrond Myklebust return 0; 14544d770ccfSTrond Myklebust out: 1455e507d9ebSTrond Myklebust __mark_inode_dirty(inode, I_DIRTY_PAGES); 14564d770ccfSTrond Myklebust return ret; 14571c75950bSTrond Myklebust } 14581c75950bSTrond Myklebust 14591c75950bSTrond Myklebust /* 14601c75950bSTrond Myklebust * Write back all requests on one page - we do this before reading it. 14611c75950bSTrond Myklebust */ 14621c75950bSTrond Myklebust int nfs_wb_page(struct inode *inode, struct page* page) 14631c75950bSTrond Myklebust { 14644d770ccfSTrond Myklebust return nfs_wb_page_priority(inode, page, FLUSH_STABLE); 14651c75950bSTrond Myklebust } 14661c75950bSTrond Myklebust 1467f7b422b1SDavid Howells int __init nfs_init_writepagecache(void) 14681da177e4SLinus Torvalds { 14691da177e4SLinus Torvalds nfs_wdata_cachep = kmem_cache_create("nfs_write_data", 14701da177e4SLinus Torvalds sizeof(struct nfs_write_data), 14711da177e4SLinus Torvalds 0, SLAB_HWCACHE_ALIGN, 147220c2df83SPaul Mundt NULL); 14731da177e4SLinus Torvalds if (nfs_wdata_cachep == NULL) 14741da177e4SLinus Torvalds return -ENOMEM; 14751da177e4SLinus Torvalds 147693d2341cSMatthew Dobson nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE, 14771da177e4SLinus Torvalds nfs_wdata_cachep); 14781da177e4SLinus Torvalds if (nfs_wdata_mempool == NULL) 14791da177e4SLinus Torvalds return -ENOMEM; 14801da177e4SLinus Torvalds 148193d2341cSMatthew Dobson nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT, 14821da177e4SLinus Torvalds nfs_wdata_cachep); 14831da177e4SLinus Torvalds if (nfs_commit_mempool == NULL) 14841da177e4SLinus Torvalds return -ENOMEM; 14851da177e4SLinus Torvalds 148689a09141SPeter Zijlstra /* 148789a09141SPeter Zijlstra * NFS congestion size, scale with available memory. 148889a09141SPeter Zijlstra * 148989a09141SPeter Zijlstra * 64MB: 8192k 149089a09141SPeter Zijlstra * 128MB: 11585k 149189a09141SPeter Zijlstra * 256MB: 16384k 149289a09141SPeter Zijlstra * 512MB: 23170k 149389a09141SPeter Zijlstra * 1GB: 32768k 149489a09141SPeter Zijlstra * 2GB: 46340k 149589a09141SPeter Zijlstra * 4GB: 65536k 149689a09141SPeter Zijlstra * 8GB: 92681k 149789a09141SPeter Zijlstra * 16GB: 131072k 149889a09141SPeter Zijlstra * 149989a09141SPeter Zijlstra * This allows larger machines to have larger/more transfers. 150089a09141SPeter Zijlstra * Limit the default to 256M 150189a09141SPeter Zijlstra */ 150289a09141SPeter Zijlstra nfs_congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); 150389a09141SPeter Zijlstra if (nfs_congestion_kb > 256*1024) 150489a09141SPeter Zijlstra nfs_congestion_kb = 256*1024; 150589a09141SPeter Zijlstra 15061da177e4SLinus Torvalds return 0; 15071da177e4SLinus Torvalds } 15081da177e4SLinus Torvalds 1509266bee88SDavid Brownell void nfs_destroy_writepagecache(void) 15101da177e4SLinus Torvalds { 15111da177e4SLinus Torvalds mempool_destroy(nfs_commit_mempool); 15121da177e4SLinus Torvalds mempool_destroy(nfs_wdata_mempool); 15131a1d92c1SAlexey Dobriyan kmem_cache_destroy(nfs_wdata_cachep); 15141da177e4SLinus Torvalds } 15151da177e4SLinus Torvalds 1516