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 108*383ba719STrond Myklebust void nfs_writedata_release(void *data) 1091da177e4SLinus Torvalds { 110*383ba719STrond Myklebust struct nfs_write_data *wdata = data; 111*383ba719STrond Myklebust 112*383ba719STrond Myklebust put_nfs_open_context(wdata->args.context); 1131da177e4SLinus Torvalds nfs_writedata_free(wdata); 1141da177e4SLinus Torvalds } 1151da177e4SLinus Torvalds 1167b159fc1STrond Myklebust static void nfs_context_set_write_error(struct nfs_open_context *ctx, int error) 1177b159fc1STrond Myklebust { 1187b159fc1STrond Myklebust ctx->error = error; 1197b159fc1STrond Myklebust smp_wmb(); 1207b159fc1STrond Myklebust set_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); 1217b159fc1STrond Myklebust } 1227b159fc1STrond Myklebust 123277459d2STrond Myklebust static struct nfs_page *nfs_page_find_request_locked(struct page *page) 124277459d2STrond Myklebust { 125277459d2STrond Myklebust struct nfs_page *req = NULL; 126277459d2STrond Myklebust 127277459d2STrond Myklebust if (PagePrivate(page)) { 128277459d2STrond Myklebust req = (struct nfs_page *)page_private(page); 129277459d2STrond Myklebust if (req != NULL) 130c03b4024STrond Myklebust kref_get(&req->wb_kref); 131277459d2STrond Myklebust } 132277459d2STrond Myklebust return req; 133277459d2STrond Myklebust } 134277459d2STrond Myklebust 135277459d2STrond Myklebust static struct nfs_page *nfs_page_find_request(struct page *page) 136277459d2STrond Myklebust { 137587142f8STrond Myklebust struct inode *inode = page->mapping->host; 138277459d2STrond Myklebust struct nfs_page *req = NULL; 139277459d2STrond Myklebust 140587142f8STrond Myklebust spin_lock(&inode->i_lock); 141277459d2STrond Myklebust req = nfs_page_find_request_locked(page); 142587142f8STrond Myklebust spin_unlock(&inode->i_lock); 143277459d2STrond Myklebust return req; 144277459d2STrond Myklebust } 145277459d2STrond Myklebust 1461da177e4SLinus Torvalds /* Adjust the file length if we're writing beyond the end */ 1471da177e4SLinus Torvalds static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int count) 1481da177e4SLinus Torvalds { 1491da177e4SLinus Torvalds struct inode *inode = page->mapping->host; 1501da177e4SLinus Torvalds loff_t end, i_size = i_size_read(inode); 151ca52fec1STrond Myklebust pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; 1521da177e4SLinus Torvalds 1531da177e4SLinus Torvalds if (i_size > 0 && page->index < end_index) 1541da177e4SLinus Torvalds return; 1551da177e4SLinus Torvalds end = ((loff_t)page->index << PAGE_CACHE_SHIFT) + ((loff_t)offset+count); 1561da177e4SLinus Torvalds if (i_size >= end) 1571da177e4SLinus Torvalds return; 15891d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_EXTENDWRITE); 1591da177e4SLinus Torvalds i_size_write(inode, end); 1601da177e4SLinus Torvalds } 1611da177e4SLinus Torvalds 162a301b777STrond Myklebust /* A writeback failed: mark the page as bad, and invalidate the page cache */ 163a301b777STrond Myklebust static void nfs_set_pageerror(struct page *page) 164a301b777STrond Myklebust { 165a301b777STrond Myklebust SetPageError(page); 166a301b777STrond Myklebust nfs_zap_mapping(page->mapping->host, page->mapping); 167a301b777STrond Myklebust } 168a301b777STrond Myklebust 1691da177e4SLinus Torvalds /* We can set the PG_uptodate flag if we see that a write request 1701da177e4SLinus Torvalds * covers the full page. 1711da177e4SLinus Torvalds */ 1721da177e4SLinus Torvalds static void nfs_mark_uptodate(struct page *page, unsigned int base, unsigned int count) 1731da177e4SLinus Torvalds { 1741da177e4SLinus Torvalds if (PageUptodate(page)) 1751da177e4SLinus Torvalds return; 1761da177e4SLinus Torvalds if (base != 0) 1771da177e4SLinus Torvalds return; 17849a70f27STrond Myklebust if (count != nfs_page_length(page)) 1791da177e4SLinus Torvalds return; 1801da177e4SLinus Torvalds SetPageUptodate(page); 1811da177e4SLinus Torvalds } 1821da177e4SLinus Torvalds 183e21195a7STrond Myklebust static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page, 1841da177e4SLinus Torvalds unsigned int offset, unsigned int count) 1851da177e4SLinus Torvalds { 1861da177e4SLinus Torvalds struct nfs_page *req; 187e21195a7STrond Myklebust int ret; 1881da177e4SLinus Torvalds 189e21195a7STrond Myklebust for (;;) { 190e21195a7STrond Myklebust req = nfs_update_request(ctx, page, offset, count); 191e21195a7STrond Myklebust if (!IS_ERR(req)) 192e21195a7STrond Myklebust break; 193e21195a7STrond Myklebust ret = PTR_ERR(req); 194e21195a7STrond Myklebust if (ret != -EBUSY) 195e21195a7STrond Myklebust return ret; 196e21195a7STrond Myklebust ret = nfs_wb_page(page->mapping->host, page); 197e21195a7STrond Myklebust if (ret != 0) 198e21195a7STrond Myklebust return ret; 199e21195a7STrond Myklebust } 2001da177e4SLinus Torvalds /* Update file length */ 2011da177e4SLinus Torvalds nfs_grow_file(page, offset, count); 202acee478aSTrond Myklebust nfs_clear_page_tag_locked(req); 203abd3e641STrond Myklebust return 0; 2041da177e4SLinus Torvalds } 2051da177e4SLinus Torvalds 2061da177e4SLinus Torvalds static int wb_priority(struct writeback_control *wbc) 2071da177e4SLinus Torvalds { 2081da177e4SLinus Torvalds if (wbc->for_reclaim) 209c63c7b05STrond Myklebust return FLUSH_HIGHPRI | FLUSH_STABLE; 2101da177e4SLinus Torvalds if (wbc->for_kupdate) 2111da177e4SLinus Torvalds return FLUSH_LOWPRI; 2121da177e4SLinus Torvalds return 0; 2131da177e4SLinus Torvalds } 2141da177e4SLinus Torvalds 2151da177e4SLinus Torvalds /* 21689a09141SPeter Zijlstra * NFS congestion control 21789a09141SPeter Zijlstra */ 21889a09141SPeter Zijlstra 21989a09141SPeter Zijlstra int nfs_congestion_kb; 22089a09141SPeter Zijlstra 22189a09141SPeter Zijlstra #define NFS_CONGESTION_ON_THRESH (nfs_congestion_kb >> (PAGE_SHIFT-10)) 22289a09141SPeter Zijlstra #define NFS_CONGESTION_OFF_THRESH \ 22389a09141SPeter Zijlstra (NFS_CONGESTION_ON_THRESH - (NFS_CONGESTION_ON_THRESH >> 2)) 22489a09141SPeter Zijlstra 2255a6d41b3STrond Myklebust static int nfs_set_page_writeback(struct page *page) 22689a09141SPeter Zijlstra { 2275a6d41b3STrond Myklebust int ret = test_set_page_writeback(page); 2285a6d41b3STrond Myklebust 2295a6d41b3STrond Myklebust if (!ret) { 23089a09141SPeter Zijlstra struct inode *inode = page->mapping->host; 23189a09141SPeter Zijlstra struct nfs_server *nfss = NFS_SERVER(inode); 23289a09141SPeter Zijlstra 233277866a0SPeter Zijlstra if (atomic_long_inc_return(&nfss->writeback) > 23489a09141SPeter Zijlstra NFS_CONGESTION_ON_THRESH) 23589a09141SPeter Zijlstra set_bdi_congested(&nfss->backing_dev_info, WRITE); 23689a09141SPeter Zijlstra } 2375a6d41b3STrond Myklebust return ret; 23889a09141SPeter Zijlstra } 23989a09141SPeter Zijlstra 24089a09141SPeter Zijlstra static void nfs_end_page_writeback(struct page *page) 24189a09141SPeter Zijlstra { 24289a09141SPeter Zijlstra struct inode *inode = page->mapping->host; 24389a09141SPeter Zijlstra struct nfs_server *nfss = NFS_SERVER(inode); 24489a09141SPeter Zijlstra 24589a09141SPeter Zijlstra end_page_writeback(page); 246c4dc4beeSPeter Zijlstra if (atomic_long_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH) 24789a09141SPeter Zijlstra clear_bdi_congested(&nfss->backing_dev_info, WRITE); 24889a09141SPeter Zijlstra } 24989a09141SPeter Zijlstra 25089a09141SPeter Zijlstra /* 251e261f51fSTrond Myklebust * Find an associated nfs write request, and prepare to flush it out 2529cccef95STrond Myklebust * May return an error if the user signalled nfs_wait_on_request(). 253e261f51fSTrond Myklebust */ 254c63c7b05STrond Myklebust static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio, 255c63c7b05STrond Myklebust struct page *page) 256e261f51fSTrond Myklebust { 257587142f8STrond Myklebust struct inode *inode = page->mapping->host; 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 } 268acee478aSTrond Myklebust if (nfs_set_page_tag_locked(req)) 269e261f51fSTrond Myklebust break; 270e261f51fSTrond Myklebust /* Note: If we hold the page lock, as is the case in nfs_writepage, 271acee478aSTrond Myklebust * then the call to nfs_set_page_tag_locked() 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); 285acee478aSTrond Myklebust nfs_clear_page_tag_locked(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 } 293587142f8STrond Myklebust spin_unlock(&inode->i_lock); 294c63c7b05STrond Myklebust nfs_pageio_add_request(pgio, req); 2959cccef95STrond Myklebust return 0; 296e261f51fSTrond Myklebust } 297e261f51fSTrond Myklebust 298f758c885STrond Myklebust static int nfs_do_writepage(struct page *page, struct writeback_control *wbc, struct nfs_pageio_descriptor *pgio) 299f758c885STrond Myklebust { 300f758c885STrond Myklebust struct inode *inode = page->mapping->host; 301f758c885STrond Myklebust 302f758c885STrond Myklebust nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE); 303f758c885STrond Myklebust nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1); 304f758c885STrond Myklebust 305f758c885STrond Myklebust nfs_pageio_cond_complete(pgio, page->index); 306f758c885STrond Myklebust return nfs_page_async_flush(pgio, page); 307f758c885STrond Myklebust } 308f758c885STrond Myklebust 309e261f51fSTrond Myklebust /* 3101da177e4SLinus Torvalds * Write an mmapped page to the server. 3111da177e4SLinus Torvalds */ 3124d770ccfSTrond Myklebust static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc) 3131da177e4SLinus Torvalds { 314f758c885STrond Myklebust struct nfs_pageio_descriptor pgio; 315e261f51fSTrond Myklebust int err; 3161da177e4SLinus Torvalds 317f758c885STrond Myklebust nfs_pageio_init_write(&pgio, page->mapping->host, wb_priority(wbc)); 318f758c885STrond Myklebust err = nfs_do_writepage(page, wbc, &pgio); 319f758c885STrond Myklebust nfs_pageio_complete(&pgio); 320f758c885STrond Myklebust if (err < 0) 3214d770ccfSTrond Myklebust return err; 322f758c885STrond Myklebust if (pgio.pg_error < 0) 323f758c885STrond Myklebust return pgio.pg_error; 324f758c885STrond Myklebust return 0; 3254d770ccfSTrond Myklebust } 3264d770ccfSTrond Myklebust 3274d770ccfSTrond Myklebust int nfs_writepage(struct page *page, struct writeback_control *wbc) 3284d770ccfSTrond Myklebust { 329f758c885STrond Myklebust int ret; 3304d770ccfSTrond Myklebust 331f758c885STrond Myklebust ret = nfs_writepage_locked(page, wbc); 3321da177e4SLinus Torvalds unlock_page(page); 333f758c885STrond Myklebust return ret; 334f758c885STrond Myklebust } 335f758c885STrond Myklebust 336f758c885STrond Myklebust static int nfs_writepages_callback(struct page *page, struct writeback_control *wbc, void *data) 337f758c885STrond Myklebust { 338f758c885STrond Myklebust int ret; 339f758c885STrond Myklebust 340f758c885STrond Myklebust ret = nfs_do_writepage(page, wbc, data); 341f758c885STrond Myklebust unlock_page(page); 342f758c885STrond Myklebust return ret; 3431da177e4SLinus Torvalds } 3441da177e4SLinus Torvalds 3451da177e4SLinus Torvalds int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc) 3461da177e4SLinus Torvalds { 3471da177e4SLinus Torvalds struct inode *inode = mapping->host; 348c63c7b05STrond Myklebust struct nfs_pageio_descriptor pgio; 3491da177e4SLinus Torvalds int err; 3501da177e4SLinus Torvalds 35191d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES); 35291d5b470SChuck Lever 353c63c7b05STrond Myklebust nfs_pageio_init_write(&pgio, inode, wb_priority(wbc)); 354f758c885STrond Myklebust err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio); 355c63c7b05STrond Myklebust nfs_pageio_complete(&pgio); 356f758c885STrond Myklebust if (err < 0) 3571da177e4SLinus Torvalds return err; 358f758c885STrond Myklebust if (pgio.pg_error < 0) 359c63c7b05STrond Myklebust return pgio.pg_error; 360c63c7b05STrond Myklebust return 0; 3611da177e4SLinus Torvalds } 3621da177e4SLinus Torvalds 3631da177e4SLinus Torvalds /* 3641da177e4SLinus Torvalds * Insert a write request into an inode 3651da177e4SLinus Torvalds */ 3661da177e4SLinus Torvalds static int nfs_inode_add_request(struct inode *inode, struct nfs_page *req) 3671da177e4SLinus Torvalds { 3681da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 3691da177e4SLinus Torvalds int error; 3701da177e4SLinus Torvalds 3711da177e4SLinus Torvalds error = radix_tree_insert(&nfsi->nfs_page_tree, req->wb_index, req); 3721da177e4SLinus Torvalds BUG_ON(error == -EEXIST); 3731da177e4SLinus Torvalds if (error) 3741da177e4SLinus Torvalds return error; 3751da177e4SLinus Torvalds if (!nfsi->npages) { 3761da177e4SLinus Torvalds igrab(inode); 3771da177e4SLinus Torvalds if (nfs_have_delegation(inode, FMODE_WRITE)) 3781da177e4SLinus Torvalds nfsi->change_attr++; 3791da177e4SLinus Torvalds } 380deb7d638STrond Myklebust SetPagePrivate(req->wb_page); 381277459d2STrond Myklebust set_page_private(req->wb_page, (unsigned long)req); 3821da177e4SLinus Torvalds nfsi->npages++; 383c03b4024STrond Myklebust kref_get(&req->wb_kref); 384acee478aSTrond Myklebust radix_tree_tag_set(&nfsi->nfs_page_tree, req->wb_index, NFS_PAGE_TAG_LOCKED); 3851da177e4SLinus Torvalds return 0; 3861da177e4SLinus Torvalds } 3871da177e4SLinus Torvalds 3881da177e4SLinus Torvalds /* 38989a09141SPeter Zijlstra * Remove a write request from an inode 3901da177e4SLinus Torvalds */ 3911da177e4SLinus Torvalds static void nfs_inode_remove_request(struct nfs_page *req) 3921da177e4SLinus Torvalds { 39388be9f99STrond Myklebust struct inode *inode = req->wb_context->path.dentry->d_inode; 3941da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 3951da177e4SLinus Torvalds 3961da177e4SLinus Torvalds BUG_ON (!NFS_WBACK_BUSY(req)); 3971da177e4SLinus Torvalds 398587142f8STrond Myklebust spin_lock(&inode->i_lock); 399277459d2STrond Myklebust set_page_private(req->wb_page, 0); 400deb7d638STrond Myklebust ClearPagePrivate(req->wb_page); 4011da177e4SLinus Torvalds radix_tree_delete(&nfsi->nfs_page_tree, req->wb_index); 4021da177e4SLinus Torvalds nfsi->npages--; 4031da177e4SLinus Torvalds if (!nfsi->npages) { 404587142f8STrond Myklebust spin_unlock(&inode->i_lock); 4051da177e4SLinus Torvalds iput(inode); 4061da177e4SLinus Torvalds } else 407587142f8STrond Myklebust spin_unlock(&inode->i_lock); 4081da177e4SLinus Torvalds nfs_clear_request(req); 4091da177e4SLinus Torvalds nfs_release_request(req); 4101da177e4SLinus Torvalds } 4111da177e4SLinus Torvalds 41261822ab5STrond Myklebust static void 41361822ab5STrond Myklebust nfs_redirty_request(struct nfs_page *req) 41461822ab5STrond Myklebust { 41561822ab5STrond Myklebust __set_page_dirty_nobuffers(req->wb_page); 41661822ab5STrond Myklebust } 41761822ab5STrond Myklebust 4181da177e4SLinus Torvalds /* 4191da177e4SLinus Torvalds * Check if a request is dirty 4201da177e4SLinus Torvalds */ 4211da177e4SLinus Torvalds static inline int 4221da177e4SLinus Torvalds nfs_dirty_request(struct nfs_page *req) 4231da177e4SLinus Torvalds { 4245a6d41b3STrond Myklebust struct page *page = req->wb_page; 4255a6d41b3STrond Myklebust 426612c9384STrond Myklebust if (page == NULL || test_bit(PG_NEED_COMMIT, &req->wb_flags)) 4275a6d41b3STrond Myklebust return 0; 4285a6d41b3STrond Myklebust return !PageWriteback(req->wb_page); 4291da177e4SLinus Torvalds } 4301da177e4SLinus Torvalds 4311da177e4SLinus Torvalds #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) 4321da177e4SLinus Torvalds /* 4331da177e4SLinus Torvalds * Add a request to the inode's commit list. 4341da177e4SLinus Torvalds */ 4351da177e4SLinus Torvalds static void 4361da177e4SLinus Torvalds nfs_mark_request_commit(struct nfs_page *req) 4371da177e4SLinus Torvalds { 43888be9f99STrond Myklebust struct inode *inode = req->wb_context->path.dentry->d_inode; 4391da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 4401da177e4SLinus Torvalds 441587142f8STrond Myklebust spin_lock(&inode->i_lock); 4421da177e4SLinus Torvalds nfsi->ncommit++; 443612c9384STrond Myklebust set_bit(PG_NEED_COMMIT, &(req)->wb_flags); 4445c369683STrond Myklebust radix_tree_tag_set(&nfsi->nfs_page_tree, 4455c369683STrond Myklebust req->wb_index, 4465c369683STrond Myklebust NFS_PAGE_TAG_COMMIT); 447587142f8STrond Myklebust spin_unlock(&inode->i_lock); 448fd39fc85SChristoph Lameter inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); 449c9e51e41SPeter Zijlstra inc_bdi_stat(req->wb_page->mapping->backing_dev_info, BDI_RECLAIMABLE); 450a1803044STrond Myklebust __mark_inode_dirty(inode, I_DIRTY_DATASYNC); 4511da177e4SLinus Torvalds } 4528e821cadSTrond Myklebust 4538e821cadSTrond Myklebust static inline 4548e821cadSTrond Myklebust int nfs_write_need_commit(struct nfs_write_data *data) 4558e821cadSTrond Myklebust { 4568e821cadSTrond Myklebust return data->verf.committed != NFS_FILE_SYNC; 4578e821cadSTrond Myklebust } 4588e821cadSTrond Myklebust 4598e821cadSTrond Myklebust static inline 4608e821cadSTrond Myklebust int nfs_reschedule_unstable_write(struct nfs_page *req) 4618e821cadSTrond Myklebust { 462612c9384STrond Myklebust if (test_bit(PG_NEED_COMMIT, &req->wb_flags)) { 4638e821cadSTrond Myklebust nfs_mark_request_commit(req); 4648e821cadSTrond Myklebust return 1; 4658e821cadSTrond Myklebust } 4668e821cadSTrond Myklebust if (test_and_clear_bit(PG_NEED_RESCHED, &req->wb_flags)) { 4678e821cadSTrond Myklebust nfs_redirty_request(req); 4688e821cadSTrond Myklebust return 1; 4698e821cadSTrond Myklebust } 4708e821cadSTrond Myklebust return 0; 4718e821cadSTrond Myklebust } 4728e821cadSTrond Myklebust #else 4738e821cadSTrond Myklebust static inline void 4748e821cadSTrond Myklebust nfs_mark_request_commit(struct nfs_page *req) 4758e821cadSTrond Myklebust { 4768e821cadSTrond Myklebust } 4778e821cadSTrond Myklebust 4788e821cadSTrond Myklebust static inline 4798e821cadSTrond Myklebust int nfs_write_need_commit(struct nfs_write_data *data) 4808e821cadSTrond Myklebust { 4818e821cadSTrond Myklebust return 0; 4828e821cadSTrond Myklebust } 4838e821cadSTrond Myklebust 4848e821cadSTrond Myklebust static inline 4858e821cadSTrond Myklebust int nfs_reschedule_unstable_write(struct nfs_page *req) 4868e821cadSTrond Myklebust { 4878e821cadSTrond Myklebust return 0; 4888e821cadSTrond Myklebust } 4891da177e4SLinus Torvalds #endif 4901da177e4SLinus Torvalds 4911da177e4SLinus Torvalds /* 4921da177e4SLinus Torvalds * Wait for a request to complete. 4931da177e4SLinus Torvalds * 494150030b7SMatthew Wilcox * Interruptible by fatal signals only. 4951da177e4SLinus Torvalds */ 496ca52fec1STrond Myklebust static int nfs_wait_on_requests_locked(struct inode *inode, pgoff_t idx_start, unsigned int npages) 4971da177e4SLinus Torvalds { 4981da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 4991da177e4SLinus Torvalds struct nfs_page *req; 500ca52fec1STrond Myklebust pgoff_t idx_end, next; 5011da177e4SLinus Torvalds unsigned int res = 0; 5021da177e4SLinus Torvalds int error; 5031da177e4SLinus Torvalds 5041da177e4SLinus Torvalds if (npages == 0) 5051da177e4SLinus Torvalds idx_end = ~0; 5061da177e4SLinus Torvalds else 5071da177e4SLinus Torvalds idx_end = idx_start + npages - 1; 5081da177e4SLinus Torvalds 5091da177e4SLinus Torvalds next = idx_start; 5109fd367f0STrond Myklebust while (radix_tree_gang_lookup_tag(&nfsi->nfs_page_tree, (void **)&req, next, 1, NFS_PAGE_TAG_LOCKED)) { 5111da177e4SLinus Torvalds if (req->wb_index > idx_end) 5121da177e4SLinus Torvalds break; 5131da177e4SLinus Torvalds 5141da177e4SLinus Torvalds next = req->wb_index + 1; 515c6a556b8STrond Myklebust BUG_ON(!NFS_WBACK_BUSY(req)); 5161da177e4SLinus Torvalds 517c03b4024STrond Myklebust kref_get(&req->wb_kref); 518587142f8STrond Myklebust spin_unlock(&inode->i_lock); 5191da177e4SLinus Torvalds error = nfs_wait_on_request(req); 5201da177e4SLinus Torvalds nfs_release_request(req); 521587142f8STrond Myklebust spin_lock(&inode->i_lock); 5221da177e4SLinus Torvalds if (error < 0) 5231da177e4SLinus Torvalds return error; 5241da177e4SLinus Torvalds res++; 5251da177e4SLinus Torvalds } 5261da177e4SLinus Torvalds return res; 5271da177e4SLinus Torvalds } 5281da177e4SLinus Torvalds 52983715ad5STrond Myklebust static void nfs_cancel_commit_list(struct list_head *head) 53083715ad5STrond Myklebust { 53183715ad5STrond Myklebust struct nfs_page *req; 53283715ad5STrond Myklebust 53383715ad5STrond Myklebust while(!list_empty(head)) { 53483715ad5STrond Myklebust req = nfs_list_entry(head->next); 535b6dff26aSTrond Myklebust dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); 536c9e51e41SPeter Zijlstra dec_bdi_stat(req->wb_page->mapping->backing_dev_info, 537c9e51e41SPeter Zijlstra BDI_RECLAIMABLE); 53883715ad5STrond Myklebust nfs_list_remove_request(req); 539612c9384STrond Myklebust clear_bit(PG_NEED_COMMIT, &(req)->wb_flags); 54083715ad5STrond Myklebust nfs_inode_remove_request(req); 541b6dff26aSTrond Myklebust nfs_unlock_request(req); 54283715ad5STrond Myklebust } 54383715ad5STrond Myklebust } 54483715ad5STrond Myklebust 5451da177e4SLinus Torvalds #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) 5461da177e4SLinus Torvalds /* 5471da177e4SLinus Torvalds * nfs_scan_commit - Scan an inode for commit requests 5481da177e4SLinus Torvalds * @inode: NFS inode to scan 5491da177e4SLinus Torvalds * @dst: destination list 5501da177e4SLinus Torvalds * @idx_start: lower bound of page->index to scan. 5511da177e4SLinus Torvalds * @npages: idx_start + npages sets the upper bound to scan. 5521da177e4SLinus Torvalds * 5531da177e4SLinus Torvalds * Moves requests from the inode's 'commit' request list. 5541da177e4SLinus Torvalds * The requests are *not* checked to ensure that they form a contiguous set. 5551da177e4SLinus Torvalds */ 5561da177e4SLinus Torvalds static int 557ca52fec1STrond Myklebust nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, unsigned int npages) 5581da177e4SLinus Torvalds { 5591da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 5603da28eb1STrond Myklebust int res = 0; 5613da28eb1STrond Myklebust 5623da28eb1STrond Myklebust if (nfsi->ncommit != 0) { 5635c369683STrond Myklebust res = nfs_scan_list(nfsi, dst, idx_start, npages, 5645c369683STrond Myklebust NFS_PAGE_TAG_COMMIT); 5651da177e4SLinus Torvalds nfsi->ncommit -= res; 5663da28eb1STrond Myklebust } 5671da177e4SLinus Torvalds return res; 5681da177e4SLinus Torvalds } 569c42de9ddSTrond Myklebust #else 570ca52fec1STrond Myklebust static inline int nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, unsigned int npages) 571c42de9ddSTrond Myklebust { 572c42de9ddSTrond Myklebust return 0; 573c42de9ddSTrond Myklebust } 5741da177e4SLinus Torvalds #endif 5751da177e4SLinus Torvalds 5761da177e4SLinus Torvalds /* 5771da177e4SLinus Torvalds * Try to update any existing write request, or create one if there is none. 5781da177e4SLinus Torvalds * In order to match, the request's credentials must match those of 5791da177e4SLinus Torvalds * the calling process. 5801da177e4SLinus Torvalds * 5811da177e4SLinus Torvalds * Note: Should always be called with the Page Lock held! 5821da177e4SLinus Torvalds */ 5831da177e4SLinus Torvalds static struct nfs_page * nfs_update_request(struct nfs_open_context* ctx, 584e21195a7STrond Myklebust struct page *page, unsigned int offset, unsigned int bytes) 5851da177e4SLinus Torvalds { 58689a09141SPeter Zijlstra struct address_space *mapping = page->mapping; 58789a09141SPeter Zijlstra struct inode *inode = mapping->host; 5881da177e4SLinus Torvalds struct nfs_page *req, *new = NULL; 589ca52fec1STrond Myklebust pgoff_t rqend, end; 5901da177e4SLinus Torvalds 5911da177e4SLinus Torvalds end = offset + bytes; 5921da177e4SLinus Torvalds 5931da177e4SLinus Torvalds for (;;) { 5941da177e4SLinus Torvalds /* Loop over all inode entries and see if we find 5951da177e4SLinus Torvalds * A request for the page we wish to update 5961da177e4SLinus Torvalds */ 597587142f8STrond Myklebust spin_lock(&inode->i_lock); 598277459d2STrond Myklebust req = nfs_page_find_request_locked(page); 5991da177e4SLinus Torvalds if (req) { 600acee478aSTrond Myklebust if (!nfs_set_page_tag_locked(req)) { 6011da177e4SLinus Torvalds int error; 602277459d2STrond Myklebust 603587142f8STrond Myklebust spin_unlock(&inode->i_lock); 6041da177e4SLinus Torvalds error = nfs_wait_on_request(req); 6051da177e4SLinus Torvalds nfs_release_request(req); 6061dd594b2SNeil Brown if (error < 0) { 6071dd594b2SNeil Brown if (new) 6081dd594b2SNeil Brown nfs_release_request(new); 6091da177e4SLinus Torvalds return ERR_PTR(error); 6101dd594b2SNeil Brown } 6111da177e4SLinus Torvalds continue; 6121da177e4SLinus Torvalds } 613587142f8STrond Myklebust spin_unlock(&inode->i_lock); 6141da177e4SLinus Torvalds if (new) 6151da177e4SLinus Torvalds nfs_release_request(new); 6161da177e4SLinus Torvalds break; 6171da177e4SLinus Torvalds } 6181da177e4SLinus Torvalds 6191da177e4SLinus Torvalds if (new) { 6201da177e4SLinus Torvalds int error; 6211da177e4SLinus Torvalds nfs_lock_request_dontget(new); 6221da177e4SLinus Torvalds error = nfs_inode_add_request(inode, new); 6231da177e4SLinus Torvalds if (error) { 624587142f8STrond Myklebust spin_unlock(&inode->i_lock); 6251da177e4SLinus Torvalds nfs_unlock_request(new); 6261da177e4SLinus Torvalds return ERR_PTR(error); 6271da177e4SLinus Torvalds } 628587142f8STrond Myklebust spin_unlock(&inode->i_lock); 62961e930a9STrond Myklebust req = new; 63061e930a9STrond Myklebust goto zero_page; 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) { 650acee478aSTrond Myklebust nfs_clear_page_tag_locked(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; 65861e930a9STrond Myklebust req->wb_bytes = max(end, rqend) - req->wb_offset; 65961e930a9STrond Myklebust goto zero_page; 6601da177e4SLinus Torvalds } 6611da177e4SLinus Torvalds 6621da177e4SLinus Torvalds if (end > rqend) 6631da177e4SLinus Torvalds req->wb_bytes = end - req->wb_offset; 6641da177e4SLinus Torvalds 6651da177e4SLinus Torvalds return req; 66661e930a9STrond Myklebust zero_page: 66761e930a9STrond Myklebust /* If this page might potentially be marked as up to date, 66861e930a9STrond Myklebust * then we need to zero any uninitalised data. */ 66961e930a9STrond Myklebust if (req->wb_pgbase == 0 && req->wb_bytes != PAGE_CACHE_SIZE 67061e930a9STrond Myklebust && !PageUptodate(req->wb_page)) 671eebd2aa3SChristoph Lameter zero_user_segment(req->wb_page, req->wb_bytes, PAGE_CACHE_SIZE); 67261e930a9STrond Myklebust return req; 6731da177e4SLinus Torvalds } 6741da177e4SLinus Torvalds 6751da177e4SLinus Torvalds int nfs_flush_incompatible(struct file *file, struct page *page) 6761da177e4SLinus Torvalds { 677cd3758e3STrond Myklebust struct nfs_open_context *ctx = nfs_file_open_context(file); 6781da177e4SLinus Torvalds struct nfs_page *req; 6791a54533eSTrond Myklebust int do_flush, status; 6801da177e4SLinus Torvalds /* 6811da177e4SLinus Torvalds * Look for a request corresponding to this page. If there 6821da177e4SLinus Torvalds * is one, and it belongs to another file, we flush it out 6831da177e4SLinus Torvalds * before we try to copy anything into the page. Do this 6841da177e4SLinus Torvalds * due to the lack of an ACCESS-type call in NFSv2. 6851da177e4SLinus Torvalds * Also do the same if we find a request from an existing 6861da177e4SLinus Torvalds * dropped page. 6871da177e4SLinus Torvalds */ 6881a54533eSTrond Myklebust do { 689277459d2STrond Myklebust req = nfs_page_find_request(page); 6901a54533eSTrond Myklebust if (req == NULL) 6911a54533eSTrond Myklebust return 0; 6921a54533eSTrond Myklebust do_flush = req->wb_page != page || req->wb_context != ctx 693e261f51fSTrond Myklebust || !nfs_dirty_request(req); 6941da177e4SLinus Torvalds nfs_release_request(req); 6951a54533eSTrond Myklebust if (!do_flush) 6961a54533eSTrond Myklebust return 0; 697277459d2STrond Myklebust status = nfs_wb_page(page->mapping->host, page); 6981a54533eSTrond Myklebust } while (status == 0); 6991a54533eSTrond Myklebust return status; 7001da177e4SLinus Torvalds } 7011da177e4SLinus Torvalds 7021da177e4SLinus Torvalds /* 7035d47a356STrond Myklebust * If the page cache is marked as unsafe or invalid, then we can't rely on 7045d47a356STrond Myklebust * the PageUptodate() flag. In this case, we will need to turn off 7055d47a356STrond Myklebust * write optimisations that depend on the page contents being correct. 7065d47a356STrond Myklebust */ 7075d47a356STrond Myklebust static int nfs_write_pageuptodate(struct page *page, struct inode *inode) 7085d47a356STrond Myklebust { 7095d47a356STrond Myklebust return PageUptodate(page) && 7105d47a356STrond Myklebust !(NFS_I(inode)->cache_validity & (NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA)); 7115d47a356STrond Myklebust } 7125d47a356STrond Myklebust 7135d47a356STrond Myklebust /* 7141da177e4SLinus Torvalds * Update and possibly write a cached page of an NFS file. 7151da177e4SLinus Torvalds * 7161da177e4SLinus Torvalds * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad 7171da177e4SLinus Torvalds * things with a page scheduled for an RPC call (e.g. invalidate it). 7181da177e4SLinus Torvalds */ 7191da177e4SLinus Torvalds int nfs_updatepage(struct file *file, struct page *page, 7201da177e4SLinus Torvalds unsigned int offset, unsigned int count) 7211da177e4SLinus Torvalds { 722cd3758e3STrond Myklebust struct nfs_open_context *ctx = nfs_file_open_context(file); 7231da177e4SLinus Torvalds struct inode *inode = page->mapping->host; 7241da177e4SLinus Torvalds int status = 0; 7251da177e4SLinus Torvalds 72691d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE); 72791d5b470SChuck Lever 7281da177e4SLinus Torvalds dprintk("NFS: nfs_updatepage(%s/%s %d@%Ld)\n", 72901cce933SJosef "Jeff" Sipek file->f_path.dentry->d_parent->d_name.name, 73001cce933SJosef "Jeff" Sipek file->f_path.dentry->d_name.name, count, 7310bbacc40SChuck Lever (long long)(page_offset(page) +offset)); 7321da177e4SLinus Torvalds 7331da177e4SLinus Torvalds /* If we're not using byte range locks, and we know the page 7345d47a356STrond Myklebust * is up to date, it may be more efficient to extend the write 7355d47a356STrond Myklebust * to cover the entire page in order to avoid fragmentation 7365d47a356STrond Myklebust * inefficiencies. 7371da177e4SLinus Torvalds */ 7385d47a356STrond Myklebust if (nfs_write_pageuptodate(page, inode) && 7395d47a356STrond Myklebust inode->i_flock == NULL && 7404b5621f6STrond Myklebust !(file->f_flags & O_SYNC)) { 74149a70f27STrond Myklebust count = max(count + offset, nfs_page_length(page)); 7421da177e4SLinus Torvalds offset = 0; 7431da177e4SLinus Torvalds } 7441da177e4SLinus Torvalds 745e21195a7STrond Myklebust status = nfs_writepage_setup(ctx, page, offset, count); 746e261f51fSTrond Myklebust __set_page_dirty_nobuffers(page); 7471da177e4SLinus Torvalds 7481da177e4SLinus Torvalds dprintk("NFS: nfs_updatepage returns %d (isize %Ld)\n", 7491da177e4SLinus Torvalds status, (long long)i_size_read(inode)); 7501da177e4SLinus Torvalds if (status < 0) 751a301b777STrond Myklebust nfs_set_pageerror(page); 7521da177e4SLinus Torvalds return status; 7531da177e4SLinus Torvalds } 7541da177e4SLinus Torvalds 7551da177e4SLinus Torvalds static void nfs_writepage_release(struct nfs_page *req) 7561da177e4SLinus Torvalds { 7578e821cadSTrond Myklebust 75844dd151dSTrond Myklebust if (PageError(req->wb_page)) { 75944dd151dSTrond Myklebust nfs_end_page_writeback(req->wb_page); 76044dd151dSTrond Myklebust nfs_inode_remove_request(req); 76144dd151dSTrond Myklebust } else if (!nfs_reschedule_unstable_write(req)) { 76244dd151dSTrond Myklebust /* Set the PG_uptodate flag */ 76344dd151dSTrond Myklebust nfs_mark_uptodate(req->wb_page, req->wb_pgbase, req->wb_bytes); 76489a09141SPeter Zijlstra nfs_end_page_writeback(req->wb_page); 7651da177e4SLinus Torvalds nfs_inode_remove_request(req); 7668e821cadSTrond Myklebust } else 7678e821cadSTrond Myklebust nfs_end_page_writeback(req->wb_page); 7689fd367f0STrond Myklebust nfs_clear_page_tag_locked(req); 7691da177e4SLinus Torvalds } 7701da177e4SLinus Torvalds 7713ff7576dSTrond Myklebust static int flush_task_priority(int how) 7721da177e4SLinus Torvalds { 7731da177e4SLinus Torvalds switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) { 7741da177e4SLinus Torvalds case FLUSH_HIGHPRI: 7751da177e4SLinus Torvalds return RPC_PRIORITY_HIGH; 7761da177e4SLinus Torvalds case FLUSH_LOWPRI: 7771da177e4SLinus Torvalds return RPC_PRIORITY_LOW; 7781da177e4SLinus Torvalds } 7791da177e4SLinus Torvalds return RPC_PRIORITY_NORMAL; 7801da177e4SLinus Torvalds } 7811da177e4SLinus Torvalds 7821da177e4SLinus Torvalds /* 7831da177e4SLinus Torvalds * Set up the argument/result storage required for the RPC call. 7841da177e4SLinus Torvalds */ 7851da177e4SLinus Torvalds static void nfs_write_rpcsetup(struct nfs_page *req, 7861da177e4SLinus Torvalds struct nfs_write_data *data, 787788e7a89STrond Myklebust const struct rpc_call_ops *call_ops, 7881da177e4SLinus Torvalds unsigned int count, unsigned int offset, 7891da177e4SLinus Torvalds int how) 7901da177e4SLinus Torvalds { 79184115e1cSTrond Myklebust struct inode *inode = req->wb_context->path.dentry->d_inode; 79284115e1cSTrond Myklebust int flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; 7933ff7576dSTrond Myklebust int priority = flush_task_priority(how); 79407737691STrond Myklebust struct rpc_task *task; 795bdc7f021STrond Myklebust struct rpc_message msg = { 796bdc7f021STrond Myklebust .rpc_argp = &data->args, 797bdc7f021STrond Myklebust .rpc_resp = &data->res, 798bdc7f021STrond Myklebust .rpc_cred = req->wb_context->cred, 799bdc7f021STrond Myklebust }; 80084115e1cSTrond Myklebust struct rpc_task_setup task_setup_data = { 80184115e1cSTrond Myklebust .rpc_client = NFS_CLIENT(inode), 80207737691STrond Myklebust .task = &data->task, 803bdc7f021STrond Myklebust .rpc_message = &msg, 80484115e1cSTrond Myklebust .callback_ops = call_ops, 80584115e1cSTrond Myklebust .callback_data = data, 80684115e1cSTrond Myklebust .flags = flags, 8073ff7576dSTrond Myklebust .priority = priority, 80884115e1cSTrond Myklebust }; 8091da177e4SLinus Torvalds 8101da177e4SLinus Torvalds /* Set up the RPC argument and reply structs 8111da177e4SLinus Torvalds * NB: take care not to mess about with data->commit et al. */ 8121da177e4SLinus Torvalds 8131da177e4SLinus Torvalds data->req = req; 81488be9f99STrond Myklebust data->inode = inode = req->wb_context->path.dentry->d_inode; 815bdc7f021STrond Myklebust data->cred = msg.rpc_cred; 8161da177e4SLinus Torvalds 8171da177e4SLinus Torvalds data->args.fh = NFS_FH(inode); 8181da177e4SLinus Torvalds data->args.offset = req_offset(req) + offset; 8191da177e4SLinus Torvalds data->args.pgbase = req->wb_pgbase + offset; 8201da177e4SLinus Torvalds data->args.pages = data->pagevec; 8211da177e4SLinus Torvalds data->args.count = count; 822*383ba719STrond Myklebust data->args.context = get_nfs_open_context(req->wb_context); 823bdc7f021STrond Myklebust data->args.stable = NFS_UNSTABLE; 824bdc7f021STrond Myklebust if (how & FLUSH_STABLE) { 825bdc7f021STrond Myklebust data->args.stable = NFS_DATA_SYNC; 826bdc7f021STrond Myklebust if (!NFS_I(inode)->ncommit) 827bdc7f021STrond Myklebust data->args.stable = NFS_FILE_SYNC; 828bdc7f021STrond Myklebust } 8291da177e4SLinus Torvalds 8301da177e4SLinus Torvalds data->res.fattr = &data->fattr; 8311da177e4SLinus Torvalds data->res.count = count; 8321da177e4SLinus Torvalds data->res.verf = &data->verf; 8330e574af1STrond Myklebust nfs_fattr_init(&data->fattr); 8341da177e4SLinus Torvalds 835788e7a89STrond Myklebust /* Set up the initial task struct. */ 836bdc7f021STrond Myklebust NFS_PROTO(inode)->write_setup(data, &msg); 8371da177e4SLinus Torvalds 838a3f565b1SChuck Lever dprintk("NFS: %5u initiated write call " 839a3f565b1SChuck Lever "(req %s/%Ld, %u bytes @ offset %Lu)\n", 8400bbacc40SChuck Lever data->task.tk_pid, 8411da177e4SLinus Torvalds inode->i_sb->s_id, 8421da177e4SLinus Torvalds (long long)NFS_FILEID(inode), 8431da177e4SLinus Torvalds count, 8441da177e4SLinus Torvalds (unsigned long long)data->args.offset); 8451da177e4SLinus Torvalds 84607737691STrond Myklebust task = rpc_run_task(&task_setup_data); 84707737691STrond Myklebust if (!IS_ERR(task)) 84807737691STrond Myklebust rpc_put_task(task); 8491da177e4SLinus Torvalds } 8501da177e4SLinus Torvalds 8511da177e4SLinus Torvalds /* 8521da177e4SLinus Torvalds * Generate multiple small requests to write out a single 8531da177e4SLinus Torvalds * contiguous dirty area on one page. 8541da177e4SLinus Torvalds */ 8558d5658c9STrond Myklebust static int nfs_flush_multi(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int how) 8561da177e4SLinus Torvalds { 8571da177e4SLinus Torvalds struct nfs_page *req = nfs_list_entry(head->next); 8581da177e4SLinus Torvalds struct page *page = req->wb_page; 8591da177e4SLinus Torvalds struct nfs_write_data *data; 860e9f7bee1STrond Myklebust size_t wsize = NFS_SERVER(inode)->wsize, nbytes; 861e9f7bee1STrond Myklebust unsigned int offset; 8621da177e4SLinus Torvalds int requests = 0; 8631da177e4SLinus Torvalds LIST_HEAD(list); 8641da177e4SLinus Torvalds 8651da177e4SLinus Torvalds nfs_list_remove_request(req); 8661da177e4SLinus Torvalds 867bcb71bbaSTrond Myklebust nbytes = count; 868e9f7bee1STrond Myklebust do { 869e9f7bee1STrond Myklebust size_t len = min(nbytes, wsize); 870e9f7bee1STrond Myklebust 8718d5658c9STrond Myklebust data = nfs_writedata_alloc(1); 8721da177e4SLinus Torvalds if (!data) 8731da177e4SLinus Torvalds goto out_bad; 8741da177e4SLinus Torvalds list_add(&data->pages, &list); 8751da177e4SLinus Torvalds requests++; 876e9f7bee1STrond Myklebust nbytes -= len; 877e9f7bee1STrond Myklebust } while (nbytes != 0); 8781da177e4SLinus Torvalds atomic_set(&req->wb_complete, requests); 8791da177e4SLinus Torvalds 8801da177e4SLinus Torvalds ClearPageError(page); 8811da177e4SLinus Torvalds offset = 0; 882bcb71bbaSTrond Myklebust nbytes = count; 8831da177e4SLinus Torvalds do { 8841da177e4SLinus Torvalds data = list_entry(list.next, struct nfs_write_data, pages); 8851da177e4SLinus Torvalds list_del_init(&data->pages); 8861da177e4SLinus Torvalds 8871da177e4SLinus Torvalds data->pagevec[0] = page; 8881da177e4SLinus Torvalds 889bcb71bbaSTrond Myklebust if (nbytes < wsize) 890bcb71bbaSTrond Myklebust wsize = nbytes; 891788e7a89STrond Myklebust nfs_write_rpcsetup(req, data, &nfs_write_partial_ops, 892788e7a89STrond Myklebust wsize, offset, how); 8931da177e4SLinus Torvalds offset += wsize; 8941da177e4SLinus Torvalds nbytes -= wsize; 8951da177e4SLinus Torvalds } while (nbytes != 0); 8961da177e4SLinus Torvalds 8971da177e4SLinus Torvalds return 0; 8981da177e4SLinus Torvalds 8991da177e4SLinus Torvalds out_bad: 9001da177e4SLinus Torvalds while (!list_empty(&list)) { 9011da177e4SLinus Torvalds data = list_entry(list.next, struct nfs_write_data, pages); 9021da177e4SLinus Torvalds list_del(&data->pages); 9038aca67f0STrond Myklebust nfs_writedata_release(data); 9041da177e4SLinus Torvalds } 90561822ab5STrond Myklebust nfs_redirty_request(req); 9066d677e35STrond Myklebust nfs_end_page_writeback(req->wb_page); 9079fd367f0STrond Myklebust nfs_clear_page_tag_locked(req); 9081da177e4SLinus Torvalds return -ENOMEM; 9091da177e4SLinus Torvalds } 9101da177e4SLinus Torvalds 9111da177e4SLinus Torvalds /* 9121da177e4SLinus Torvalds * Create an RPC task for the given write request and kick it. 9131da177e4SLinus Torvalds * The page must have been locked by the caller. 9141da177e4SLinus Torvalds * 9151da177e4SLinus Torvalds * It may happen that the page we're passed is not marked dirty. 9161da177e4SLinus Torvalds * This is the case if nfs_updatepage detects a conflicting request 9171da177e4SLinus Torvalds * that has been written but not committed. 9181da177e4SLinus Torvalds */ 9198d5658c9STrond Myklebust static int nfs_flush_one(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int how) 9201da177e4SLinus Torvalds { 9211da177e4SLinus Torvalds struct nfs_page *req; 9221da177e4SLinus Torvalds struct page **pages; 9231da177e4SLinus Torvalds struct nfs_write_data *data; 9241da177e4SLinus Torvalds 9258d5658c9STrond Myklebust data = nfs_writedata_alloc(npages); 9261da177e4SLinus Torvalds if (!data) 9271da177e4SLinus Torvalds goto out_bad; 9281da177e4SLinus Torvalds 9291da177e4SLinus Torvalds pages = data->pagevec; 9301da177e4SLinus Torvalds while (!list_empty(head)) { 9311da177e4SLinus Torvalds req = nfs_list_entry(head->next); 9321da177e4SLinus Torvalds nfs_list_remove_request(req); 9331da177e4SLinus Torvalds nfs_list_add_request(req, &data->pages); 9341da177e4SLinus Torvalds ClearPageError(req->wb_page); 9351da177e4SLinus Torvalds *pages++ = req->wb_page; 9361da177e4SLinus Torvalds } 9371da177e4SLinus Torvalds req = nfs_list_entry(data->pages.next); 9381da177e4SLinus Torvalds 9391da177e4SLinus Torvalds /* Set up the argument struct */ 940788e7a89STrond Myklebust nfs_write_rpcsetup(req, data, &nfs_write_full_ops, count, 0, how); 9411da177e4SLinus Torvalds 9421da177e4SLinus Torvalds return 0; 9431da177e4SLinus Torvalds out_bad: 9441da177e4SLinus Torvalds while (!list_empty(head)) { 94510afec90STrond Myklebust req = nfs_list_entry(head->next); 9461da177e4SLinus Torvalds nfs_list_remove_request(req); 94761822ab5STrond Myklebust nfs_redirty_request(req); 9486d677e35STrond Myklebust nfs_end_page_writeback(req->wb_page); 9499fd367f0STrond Myklebust nfs_clear_page_tag_locked(req); 9501da177e4SLinus Torvalds } 9511da177e4SLinus Torvalds return -ENOMEM; 9521da177e4SLinus Torvalds } 9531da177e4SLinus Torvalds 954c63c7b05STrond Myklebust static void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, 955c63c7b05STrond Myklebust struct inode *inode, int ioflags) 9561da177e4SLinus Torvalds { 957bf4285e7SChuck Lever size_t wsize = NFS_SERVER(inode)->wsize; 9581da177e4SLinus Torvalds 959bcb71bbaSTrond Myklebust if (wsize < PAGE_CACHE_SIZE) 960c63c7b05STrond Myklebust nfs_pageio_init(pgio, inode, nfs_flush_multi, wsize, ioflags); 961bcb71bbaSTrond Myklebust else 962c63c7b05STrond Myklebust nfs_pageio_init(pgio, inode, nfs_flush_one, wsize, ioflags); 9631da177e4SLinus Torvalds } 9641da177e4SLinus Torvalds 9651da177e4SLinus Torvalds /* 9661da177e4SLinus Torvalds * Handle a write reply that flushed part of a page. 9671da177e4SLinus Torvalds */ 968788e7a89STrond Myklebust static void nfs_writeback_done_partial(struct rpc_task *task, void *calldata) 9691da177e4SLinus Torvalds { 970788e7a89STrond Myklebust struct nfs_write_data *data = calldata; 9711da177e4SLinus Torvalds struct nfs_page *req = data->req; 9721da177e4SLinus Torvalds struct page *page = req->wb_page; 9731da177e4SLinus Torvalds 9741da177e4SLinus Torvalds dprintk("NFS: write (%s/%Ld %d@%Ld)", 97588be9f99STrond Myklebust req->wb_context->path.dentry->d_inode->i_sb->s_id, 97688be9f99STrond Myklebust (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), 9771da177e4SLinus Torvalds req->wb_bytes, 9781da177e4SLinus Torvalds (long long)req_offset(req)); 9791da177e4SLinus Torvalds 980788e7a89STrond Myklebust if (nfs_writeback_done(task, data) != 0) 981788e7a89STrond Myklebust return; 982788e7a89STrond Myklebust 983788e7a89STrond Myklebust if (task->tk_status < 0) { 984a301b777STrond Myklebust nfs_set_pageerror(page); 9857b159fc1STrond Myklebust nfs_context_set_write_error(req->wb_context, task->tk_status); 986788e7a89STrond Myklebust dprintk(", error = %d\n", task->tk_status); 9878e821cadSTrond Myklebust goto out; 9888e821cadSTrond Myklebust } 9898e821cadSTrond Myklebust 9908e821cadSTrond Myklebust if (nfs_write_need_commit(data)) { 991587142f8STrond Myklebust struct inode *inode = page->mapping->host; 9928e821cadSTrond Myklebust 993587142f8STrond Myklebust spin_lock(&inode->i_lock); 9948e821cadSTrond Myklebust if (test_bit(PG_NEED_RESCHED, &req->wb_flags)) { 9958e821cadSTrond Myklebust /* Do nothing we need to resend the writes */ 9968e821cadSTrond Myklebust } else if (!test_and_set_bit(PG_NEED_COMMIT, &req->wb_flags)) { 9971da177e4SLinus Torvalds memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); 9981da177e4SLinus Torvalds dprintk(" defer commit\n"); 9991da177e4SLinus Torvalds } else if (memcmp(&req->wb_verf, &data->verf, sizeof(req->wb_verf))) { 10008e821cadSTrond Myklebust set_bit(PG_NEED_RESCHED, &req->wb_flags); 10018e821cadSTrond Myklebust clear_bit(PG_NEED_COMMIT, &req->wb_flags); 10021da177e4SLinus Torvalds dprintk(" server reboot detected\n"); 10031da177e4SLinus Torvalds } 1004587142f8STrond Myklebust spin_unlock(&inode->i_lock); 10051da177e4SLinus Torvalds } else 10061da177e4SLinus Torvalds dprintk(" OK\n"); 10071da177e4SLinus Torvalds 10088e821cadSTrond Myklebust out: 10091da177e4SLinus Torvalds if (atomic_dec_and_test(&req->wb_complete)) 10101da177e4SLinus Torvalds nfs_writepage_release(req); 10111da177e4SLinus Torvalds } 10121da177e4SLinus Torvalds 1013788e7a89STrond Myklebust static const struct rpc_call_ops nfs_write_partial_ops = { 1014788e7a89STrond Myklebust .rpc_call_done = nfs_writeback_done_partial, 1015788e7a89STrond Myklebust .rpc_release = nfs_writedata_release, 1016788e7a89STrond Myklebust }; 1017788e7a89STrond Myklebust 10181da177e4SLinus Torvalds /* 10191da177e4SLinus Torvalds * Handle a write reply that flushes a whole page. 10201da177e4SLinus Torvalds * 10211da177e4SLinus Torvalds * FIXME: There is an inherent race with invalidate_inode_pages and 10221da177e4SLinus Torvalds * writebacks since the page->count is kept > 1 for as long 10231da177e4SLinus Torvalds * as the page has a write request pending. 10241da177e4SLinus Torvalds */ 1025788e7a89STrond Myklebust static void nfs_writeback_done_full(struct rpc_task *task, void *calldata) 10261da177e4SLinus Torvalds { 1027788e7a89STrond Myklebust struct nfs_write_data *data = calldata; 10281da177e4SLinus Torvalds struct nfs_page *req; 10291da177e4SLinus Torvalds struct page *page; 10301da177e4SLinus Torvalds 1031788e7a89STrond Myklebust if (nfs_writeback_done(task, data) != 0) 1032788e7a89STrond Myklebust return; 1033788e7a89STrond Myklebust 10341da177e4SLinus Torvalds /* Update attributes as result of writeback. */ 10351da177e4SLinus Torvalds while (!list_empty(&data->pages)) { 10361da177e4SLinus Torvalds req = nfs_list_entry(data->pages.next); 10371da177e4SLinus Torvalds nfs_list_remove_request(req); 10381da177e4SLinus Torvalds page = req->wb_page; 10391da177e4SLinus Torvalds 10401da177e4SLinus Torvalds dprintk("NFS: write (%s/%Ld %d@%Ld)", 104188be9f99STrond Myklebust req->wb_context->path.dentry->d_inode->i_sb->s_id, 104288be9f99STrond Myklebust (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), 10431da177e4SLinus Torvalds req->wb_bytes, 10441da177e4SLinus Torvalds (long long)req_offset(req)); 10451da177e4SLinus Torvalds 1046788e7a89STrond Myklebust if (task->tk_status < 0) { 1047a301b777STrond Myklebust nfs_set_pageerror(page); 10487b159fc1STrond Myklebust nfs_context_set_write_error(req->wb_context, task->tk_status); 1049788e7a89STrond Myklebust dprintk(", error = %d\n", task->tk_status); 10508e821cadSTrond Myklebust goto remove_request; 10511da177e4SLinus Torvalds } 10521da177e4SLinus Torvalds 10538e821cadSTrond Myklebust if (nfs_write_need_commit(data)) { 10541da177e4SLinus Torvalds memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); 10551da177e4SLinus Torvalds nfs_mark_request_commit(req); 10568e821cadSTrond Myklebust nfs_end_page_writeback(page); 10571da177e4SLinus Torvalds dprintk(" marked for commit\n"); 10588e821cadSTrond Myklebust goto next; 10598e821cadSTrond Myklebust } 106044dd151dSTrond Myklebust /* Set the PG_uptodate flag? */ 106144dd151dSTrond Myklebust nfs_mark_uptodate(page, req->wb_pgbase, req->wb_bytes); 10628e821cadSTrond Myklebust dprintk(" OK\n"); 10638e821cadSTrond Myklebust remove_request: 10648e821cadSTrond Myklebust nfs_end_page_writeback(page); 10651da177e4SLinus Torvalds nfs_inode_remove_request(req); 10661da177e4SLinus Torvalds next: 10679fd367f0STrond Myklebust nfs_clear_page_tag_locked(req); 10681da177e4SLinus Torvalds } 10691da177e4SLinus Torvalds } 10701da177e4SLinus Torvalds 1071788e7a89STrond Myklebust static const struct rpc_call_ops nfs_write_full_ops = { 1072788e7a89STrond Myklebust .rpc_call_done = nfs_writeback_done_full, 1073788e7a89STrond Myklebust .rpc_release = nfs_writedata_release, 1074788e7a89STrond Myklebust }; 1075788e7a89STrond Myklebust 1076788e7a89STrond Myklebust 10771da177e4SLinus Torvalds /* 10781da177e4SLinus Torvalds * This function is called when the WRITE call is complete. 10791da177e4SLinus Torvalds */ 1080462d5b32SChuck Lever int nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data) 10811da177e4SLinus Torvalds { 10821da177e4SLinus Torvalds struct nfs_writeargs *argp = &data->args; 10831da177e4SLinus Torvalds struct nfs_writeres *resp = &data->res; 1084788e7a89STrond Myklebust int status; 10851da177e4SLinus Torvalds 1086a3f565b1SChuck Lever dprintk("NFS: %5u nfs_writeback_done (status %d)\n", 10871da177e4SLinus Torvalds task->tk_pid, task->tk_status); 10881da177e4SLinus Torvalds 1089f551e44fSChuck Lever /* 1090f551e44fSChuck Lever * ->write_done will attempt to use post-op attributes to detect 1091f551e44fSChuck Lever * conflicting writes by other clients. A strict interpretation 1092f551e44fSChuck Lever * of close-to-open would allow us to continue caching even if 1093f551e44fSChuck Lever * another writer had changed the file, but some applications 1094f551e44fSChuck Lever * depend on tighter cache coherency when writing. 1095f551e44fSChuck Lever */ 1096788e7a89STrond Myklebust status = NFS_PROTO(data->inode)->write_done(task, data); 1097788e7a89STrond Myklebust if (status != 0) 1098788e7a89STrond Myklebust return status; 109991d5b470SChuck Lever nfs_add_stats(data->inode, NFSIOS_SERVERWRITTENBYTES, resp->count); 110091d5b470SChuck Lever 11011da177e4SLinus Torvalds #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) 11021da177e4SLinus Torvalds if (resp->verf->committed < argp->stable && task->tk_status >= 0) { 11031da177e4SLinus Torvalds /* We tried a write call, but the server did not 11041da177e4SLinus Torvalds * commit data to stable storage even though we 11051da177e4SLinus Torvalds * requested it. 11061da177e4SLinus Torvalds * Note: There is a known bug in Tru64 < 5.0 in which 11071da177e4SLinus Torvalds * the server reports NFS_DATA_SYNC, but performs 11081da177e4SLinus Torvalds * NFS_FILE_SYNC. We therefore implement this checking 11091da177e4SLinus Torvalds * as a dprintk() in order to avoid filling syslog. 11101da177e4SLinus Torvalds */ 11111da177e4SLinus Torvalds static unsigned long complain; 11121da177e4SLinus Torvalds 11131da177e4SLinus Torvalds if (time_before(complain, jiffies)) { 11141da177e4SLinus Torvalds dprintk("NFS: faulty NFS server %s:" 11151da177e4SLinus Torvalds " (committed = %d) != (stable = %d)\n", 111654ceac45SDavid Howells NFS_SERVER(data->inode)->nfs_client->cl_hostname, 11171da177e4SLinus Torvalds resp->verf->committed, argp->stable); 11181da177e4SLinus Torvalds complain = jiffies + 300 * HZ; 11191da177e4SLinus Torvalds } 11201da177e4SLinus Torvalds } 11211da177e4SLinus Torvalds #endif 11221da177e4SLinus Torvalds /* Is this a short write? */ 11231da177e4SLinus Torvalds if (task->tk_status >= 0 && resp->count < argp->count) { 11241da177e4SLinus Torvalds static unsigned long complain; 11251da177e4SLinus Torvalds 112691d5b470SChuck Lever nfs_inc_stats(data->inode, NFSIOS_SHORTWRITE); 112791d5b470SChuck Lever 11281da177e4SLinus Torvalds /* Has the server at least made some progress? */ 11291da177e4SLinus Torvalds if (resp->count != 0) { 11301da177e4SLinus Torvalds /* Was this an NFSv2 write or an NFSv3 stable write? */ 11311da177e4SLinus Torvalds if (resp->verf->committed != NFS_UNSTABLE) { 11321da177e4SLinus Torvalds /* Resend from where the server left off */ 11331da177e4SLinus Torvalds argp->offset += resp->count; 11341da177e4SLinus Torvalds argp->pgbase += resp->count; 11351da177e4SLinus Torvalds argp->count -= resp->count; 11361da177e4SLinus Torvalds } else { 11371da177e4SLinus Torvalds /* Resend as a stable write in order to avoid 11381da177e4SLinus Torvalds * headaches in the case of a server crash. 11391da177e4SLinus Torvalds */ 11401da177e4SLinus Torvalds argp->stable = NFS_FILE_SYNC; 11411da177e4SLinus Torvalds } 11421da177e4SLinus Torvalds rpc_restart_call(task); 1143788e7a89STrond Myklebust return -EAGAIN; 11441da177e4SLinus Torvalds } 11451da177e4SLinus Torvalds if (time_before(complain, jiffies)) { 11461da177e4SLinus Torvalds printk(KERN_WARNING 11471da177e4SLinus Torvalds "NFS: Server wrote zero bytes, expected %u.\n", 11481da177e4SLinus Torvalds argp->count); 11491da177e4SLinus Torvalds complain = jiffies + 300 * HZ; 11501da177e4SLinus Torvalds } 11511da177e4SLinus Torvalds /* Can't do anything about it except throw an error. */ 11521da177e4SLinus Torvalds task->tk_status = -EIO; 11531da177e4SLinus Torvalds } 1154788e7a89STrond Myklebust return 0; 11551da177e4SLinus Torvalds } 11561da177e4SLinus Torvalds 11571da177e4SLinus Torvalds 11581da177e4SLinus Torvalds #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) 1159*383ba719STrond Myklebust void nfs_commit_release(void *data) 11601da177e4SLinus Torvalds { 1161*383ba719STrond Myklebust struct nfs_write_data *wdata = data; 1162*383ba719STrond Myklebust 1163*383ba719STrond Myklebust put_nfs_open_context(wdata->args.context); 11641da177e4SLinus Torvalds nfs_commit_free(wdata); 11651da177e4SLinus Torvalds } 11661da177e4SLinus Torvalds 11671da177e4SLinus Torvalds /* 11681da177e4SLinus Torvalds * Set up the argument/result storage required for the RPC call. 11691da177e4SLinus Torvalds */ 11701da177e4SLinus Torvalds static void nfs_commit_rpcsetup(struct list_head *head, 1171788e7a89STrond Myklebust struct nfs_write_data *data, 1172788e7a89STrond Myklebust int how) 11731da177e4SLinus Torvalds { 117484115e1cSTrond Myklebust struct nfs_page *first = nfs_list_entry(head->next); 117584115e1cSTrond Myklebust struct inode *inode = first->wb_context->path.dentry->d_inode; 117684115e1cSTrond Myklebust int flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; 11773ff7576dSTrond Myklebust int priority = flush_task_priority(how); 117807737691STrond Myklebust struct rpc_task *task; 1179bdc7f021STrond Myklebust struct rpc_message msg = { 1180bdc7f021STrond Myklebust .rpc_argp = &data->args, 1181bdc7f021STrond Myklebust .rpc_resp = &data->res, 1182bdc7f021STrond Myklebust .rpc_cred = first->wb_context->cred, 1183bdc7f021STrond Myklebust }; 118484115e1cSTrond Myklebust struct rpc_task_setup task_setup_data = { 118507737691STrond Myklebust .task = &data->task, 118684115e1cSTrond Myklebust .rpc_client = NFS_CLIENT(inode), 1187bdc7f021STrond Myklebust .rpc_message = &msg, 118884115e1cSTrond Myklebust .callback_ops = &nfs_commit_ops, 118984115e1cSTrond Myklebust .callback_data = data, 119084115e1cSTrond Myklebust .flags = flags, 11913ff7576dSTrond Myklebust .priority = priority, 119284115e1cSTrond Myklebust }; 11931da177e4SLinus Torvalds 11941da177e4SLinus Torvalds /* Set up the RPC argument and reply structs 11951da177e4SLinus Torvalds * NB: take care not to mess about with data->commit et al. */ 11961da177e4SLinus Torvalds 11971da177e4SLinus Torvalds list_splice_init(head, &data->pages); 11981da177e4SLinus Torvalds 11991da177e4SLinus Torvalds data->inode = inode; 1200bdc7f021STrond Myklebust data->cred = msg.rpc_cred; 12011da177e4SLinus Torvalds 12021da177e4SLinus Torvalds data->args.fh = NFS_FH(data->inode); 12033da28eb1STrond Myklebust /* Note: we always request a commit of the entire inode */ 12043da28eb1STrond Myklebust data->args.offset = 0; 12053da28eb1STrond Myklebust data->args.count = 0; 1206*383ba719STrond Myklebust data->args.context = get_nfs_open_context(first->wb_context); 12073da28eb1STrond Myklebust data->res.count = 0; 12081da177e4SLinus Torvalds data->res.fattr = &data->fattr; 12091da177e4SLinus Torvalds data->res.verf = &data->verf; 12100e574af1STrond Myklebust nfs_fattr_init(&data->fattr); 12111da177e4SLinus Torvalds 1212788e7a89STrond Myklebust /* Set up the initial task struct. */ 1213bdc7f021STrond Myklebust NFS_PROTO(inode)->commit_setup(data, &msg); 12141da177e4SLinus Torvalds 1215a3f565b1SChuck Lever dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid); 1216bdc7f021STrond Myklebust 121707737691STrond Myklebust task = rpc_run_task(&task_setup_data); 121807737691STrond Myklebust if (!IS_ERR(task)) 121907737691STrond Myklebust rpc_put_task(task); 12201da177e4SLinus Torvalds } 12211da177e4SLinus Torvalds 12221da177e4SLinus Torvalds /* 12231da177e4SLinus Torvalds * Commit dirty pages 12241da177e4SLinus Torvalds */ 12251da177e4SLinus Torvalds static int 122640859d7eSChuck Lever nfs_commit_list(struct inode *inode, struct list_head *head, int how) 12271da177e4SLinus Torvalds { 12281da177e4SLinus Torvalds struct nfs_write_data *data; 12291da177e4SLinus Torvalds struct nfs_page *req; 12301da177e4SLinus Torvalds 1231e9f7bee1STrond Myklebust data = nfs_commit_alloc(); 12321da177e4SLinus Torvalds 12331da177e4SLinus Torvalds if (!data) 12341da177e4SLinus Torvalds goto out_bad; 12351da177e4SLinus Torvalds 12361da177e4SLinus Torvalds /* Set up the argument struct */ 12371da177e4SLinus Torvalds nfs_commit_rpcsetup(head, data, how); 12381da177e4SLinus Torvalds 12391da177e4SLinus Torvalds return 0; 12401da177e4SLinus Torvalds out_bad: 12411da177e4SLinus Torvalds while (!list_empty(head)) { 12421da177e4SLinus Torvalds req = nfs_list_entry(head->next); 12431da177e4SLinus Torvalds nfs_list_remove_request(req); 12441da177e4SLinus Torvalds nfs_mark_request_commit(req); 124583715ad5STrond Myklebust dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); 1246c9e51e41SPeter Zijlstra dec_bdi_stat(req->wb_page->mapping->backing_dev_info, 1247c9e51e41SPeter Zijlstra BDI_RECLAIMABLE); 12489fd367f0STrond Myklebust nfs_clear_page_tag_locked(req); 12491da177e4SLinus Torvalds } 12501da177e4SLinus Torvalds return -ENOMEM; 12511da177e4SLinus Torvalds } 12521da177e4SLinus Torvalds 12531da177e4SLinus Torvalds /* 12541da177e4SLinus Torvalds * COMMIT call returned 12551da177e4SLinus Torvalds */ 1256788e7a89STrond Myklebust static void nfs_commit_done(struct rpc_task *task, void *calldata) 12571da177e4SLinus Torvalds { 1258963d8fe5STrond Myklebust struct nfs_write_data *data = calldata; 12591da177e4SLinus Torvalds struct nfs_page *req; 12601da177e4SLinus Torvalds 1261a3f565b1SChuck Lever dprintk("NFS: %5u nfs_commit_done (status %d)\n", 12621da177e4SLinus Torvalds task->tk_pid, task->tk_status); 12631da177e4SLinus Torvalds 1264788e7a89STrond Myklebust /* Call the NFS version-specific code */ 1265788e7a89STrond Myklebust if (NFS_PROTO(data->inode)->commit_done(task, data) != 0) 1266788e7a89STrond Myklebust return; 1267788e7a89STrond Myklebust 12681da177e4SLinus Torvalds while (!list_empty(&data->pages)) { 12691da177e4SLinus Torvalds req = nfs_list_entry(data->pages.next); 12701da177e4SLinus Torvalds nfs_list_remove_request(req); 1271612c9384STrond Myklebust clear_bit(PG_NEED_COMMIT, &(req)->wb_flags); 1272fd39fc85SChristoph Lameter dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); 1273c9e51e41SPeter Zijlstra dec_bdi_stat(req->wb_page->mapping->backing_dev_info, 1274c9e51e41SPeter Zijlstra BDI_RECLAIMABLE); 12751da177e4SLinus Torvalds 12761da177e4SLinus Torvalds dprintk("NFS: commit (%s/%Ld %d@%Ld)", 127788be9f99STrond Myklebust req->wb_context->path.dentry->d_inode->i_sb->s_id, 127888be9f99STrond Myklebust (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), 12791da177e4SLinus Torvalds req->wb_bytes, 12801da177e4SLinus Torvalds (long long)req_offset(req)); 12811da177e4SLinus Torvalds if (task->tk_status < 0) { 12827b159fc1STrond Myklebust nfs_context_set_write_error(req->wb_context, task->tk_status); 12831da177e4SLinus Torvalds nfs_inode_remove_request(req); 12841da177e4SLinus Torvalds dprintk(", error = %d\n", task->tk_status); 12851da177e4SLinus Torvalds goto next; 12861da177e4SLinus Torvalds } 12871da177e4SLinus Torvalds 12881da177e4SLinus Torvalds /* Okay, COMMIT succeeded, apparently. Check the verifier 12891da177e4SLinus Torvalds * returned by the server against all stored verfs. */ 12901da177e4SLinus Torvalds if (!memcmp(req->wb_verf.verifier, data->verf.verifier, sizeof(data->verf.verifier))) { 12911da177e4SLinus Torvalds /* We have a match */ 129244dd151dSTrond Myklebust /* Set the PG_uptodate flag */ 129344dd151dSTrond Myklebust nfs_mark_uptodate(req->wb_page, req->wb_pgbase, 129444dd151dSTrond Myklebust req->wb_bytes); 12951da177e4SLinus Torvalds nfs_inode_remove_request(req); 12961da177e4SLinus Torvalds dprintk(" OK\n"); 12971da177e4SLinus Torvalds goto next; 12981da177e4SLinus Torvalds } 12991da177e4SLinus Torvalds /* We have a mismatch. Write the page again */ 13001da177e4SLinus Torvalds dprintk(" mismatch\n"); 130161822ab5STrond Myklebust nfs_redirty_request(req); 13021da177e4SLinus Torvalds next: 13039fd367f0STrond Myklebust nfs_clear_page_tag_locked(req); 13041da177e4SLinus Torvalds } 13051da177e4SLinus Torvalds } 1306788e7a89STrond Myklebust 1307788e7a89STrond Myklebust static const struct rpc_call_ops nfs_commit_ops = { 1308788e7a89STrond Myklebust .rpc_call_done = nfs_commit_done, 1309788e7a89STrond Myklebust .rpc_release = nfs_commit_release, 1310788e7a89STrond Myklebust }; 13111da177e4SLinus Torvalds 13123da28eb1STrond Myklebust int nfs_commit_inode(struct inode *inode, int how) 13131da177e4SLinus Torvalds { 13141da177e4SLinus Torvalds LIST_HEAD(head); 13157d46a49fSTrond Myklebust int res; 13161da177e4SLinus Torvalds 1317587142f8STrond Myklebust spin_lock(&inode->i_lock); 13183da28eb1STrond Myklebust res = nfs_scan_commit(inode, &head, 0, 0); 1319587142f8STrond Myklebust spin_unlock(&inode->i_lock); 13201da177e4SLinus Torvalds if (res) { 13217d46a49fSTrond Myklebust int error = nfs_commit_list(inode, &head, how); 13221da177e4SLinus Torvalds if (error < 0) 13231da177e4SLinus Torvalds return error; 13243da28eb1STrond Myklebust } 13251da177e4SLinus Torvalds return res; 13261da177e4SLinus Torvalds } 1327c63c7b05STrond Myklebust #else 1328c63c7b05STrond Myklebust static inline int nfs_commit_list(struct inode *inode, struct list_head *head, int how) 1329c63c7b05STrond Myklebust { 1330c63c7b05STrond Myklebust return 0; 1331c63c7b05STrond Myklebust } 13321da177e4SLinus Torvalds #endif 13331da177e4SLinus Torvalds 13341c75950bSTrond Myklebust long nfs_sync_mapping_wait(struct address_space *mapping, struct writeback_control *wbc, int how) 13351da177e4SLinus Torvalds { 13361c75950bSTrond Myklebust struct inode *inode = mapping->host; 1337ca52fec1STrond Myklebust pgoff_t idx_start, idx_end; 13381c75950bSTrond Myklebust unsigned int npages = 0; 1339c42de9ddSTrond Myklebust LIST_HEAD(head); 134070b9ecbdSTrond Myklebust int nocommit = how & FLUSH_NOCOMMIT; 13413f442547STrond Myklebust long pages, ret; 13421da177e4SLinus Torvalds 13431c75950bSTrond Myklebust /* FIXME */ 13441c75950bSTrond Myklebust if (wbc->range_cyclic) 13451c75950bSTrond Myklebust idx_start = 0; 13461c75950bSTrond Myklebust else { 13471c75950bSTrond Myklebust idx_start = wbc->range_start >> PAGE_CACHE_SHIFT; 13481c75950bSTrond Myklebust idx_end = wbc->range_end >> PAGE_CACHE_SHIFT; 13491c75950bSTrond Myklebust if (idx_end > idx_start) { 1350ca52fec1STrond Myklebust pgoff_t l_npages = 1 + idx_end - idx_start; 13511c75950bSTrond Myklebust npages = l_npages; 13521c75950bSTrond Myklebust if (sizeof(npages) != sizeof(l_npages) && 1353ca52fec1STrond Myklebust (pgoff_t)npages != l_npages) 13541c75950bSTrond Myklebust npages = 0; 13551c75950bSTrond Myklebust } 13561c75950bSTrond Myklebust } 1357c42de9ddSTrond Myklebust how &= ~FLUSH_NOCOMMIT; 1358587142f8STrond Myklebust spin_lock(&inode->i_lock); 13591da177e4SLinus Torvalds do { 1360c42de9ddSTrond Myklebust ret = nfs_wait_on_requests_locked(inode, idx_start, npages); 1361c42de9ddSTrond Myklebust if (ret != 0) 1362c42de9ddSTrond Myklebust continue; 1363c42de9ddSTrond Myklebust if (nocommit) 1364c42de9ddSTrond Myklebust break; 1365d2ccddf0STrond Myklebust pages = nfs_scan_commit(inode, &head, idx_start, npages); 1366724c439cSTrond Myklebust if (pages == 0) 1367c42de9ddSTrond Myklebust break; 1368d2ccddf0STrond Myklebust if (how & FLUSH_INVALIDATE) { 1369587142f8STrond Myklebust spin_unlock(&inode->i_lock); 137083715ad5STrond Myklebust nfs_cancel_commit_list(&head); 1371e8e058e8STrond Myklebust ret = pages; 1372587142f8STrond Myklebust spin_lock(&inode->i_lock); 1373d2ccddf0STrond Myklebust continue; 1374d2ccddf0STrond Myklebust } 1375d2ccddf0STrond Myklebust pages += nfs_scan_commit(inode, &head, 0, 0); 1376587142f8STrond Myklebust spin_unlock(&inode->i_lock); 1377c42de9ddSTrond Myklebust ret = nfs_commit_list(inode, &head, how); 1378587142f8STrond Myklebust spin_lock(&inode->i_lock); 1379587142f8STrond Myklebust 1380c42de9ddSTrond Myklebust } while (ret >= 0); 1381587142f8STrond Myklebust spin_unlock(&inode->i_lock); 1382c42de9ddSTrond Myklebust return ret; 13831da177e4SLinus Torvalds } 13841da177e4SLinus Torvalds 138534901f70STrond Myklebust static int __nfs_write_mapping(struct address_space *mapping, struct writeback_control *wbc, int how) 13861c75950bSTrond Myklebust { 13871c75950bSTrond Myklebust int ret; 13881c75950bSTrond Myklebust 138934901f70STrond Myklebust ret = nfs_writepages(mapping, wbc); 139061822ab5STrond Myklebust if (ret < 0) 139161822ab5STrond Myklebust goto out; 139234901f70STrond Myklebust ret = nfs_sync_mapping_wait(mapping, wbc, how); 1393ed90ef51STrond Myklebust if (ret < 0) 1394ed90ef51STrond Myklebust goto out; 13951c75950bSTrond Myklebust return 0; 139661822ab5STrond Myklebust out: 1397e507d9ebSTrond Myklebust __mark_inode_dirty(mapping->host, I_DIRTY_PAGES); 13981c75950bSTrond Myklebust return ret; 13991c75950bSTrond Myklebust } 14001c75950bSTrond Myklebust 140134901f70STrond Myklebust /* Two pass sync: first using WB_SYNC_NONE, then WB_SYNC_ALL */ 140234901f70STrond Myklebust static int nfs_write_mapping(struct address_space *mapping, int how) 140334901f70STrond Myklebust { 140434901f70STrond Myklebust struct writeback_control wbc = { 140534901f70STrond Myklebust .bdi = mapping->backing_dev_info, 140634901f70STrond Myklebust .sync_mode = WB_SYNC_NONE, 140734901f70STrond Myklebust .nr_to_write = LONG_MAX, 140834901f70STrond Myklebust .for_writepages = 1, 140934901f70STrond Myklebust .range_cyclic = 1, 141034901f70STrond Myklebust }; 141134901f70STrond Myklebust int ret; 141234901f70STrond Myklebust 141334901f70STrond Myklebust ret = __nfs_write_mapping(mapping, &wbc, how); 141434901f70STrond Myklebust if (ret < 0) 141534901f70STrond Myklebust return ret; 141634901f70STrond Myklebust wbc.sync_mode = WB_SYNC_ALL; 141734901f70STrond Myklebust return __nfs_write_mapping(mapping, &wbc, how); 141834901f70STrond Myklebust } 141934901f70STrond Myklebust 1420ed90ef51STrond Myklebust /* 1421ed90ef51STrond Myklebust * flush the inode to disk. 1422ed90ef51STrond Myklebust */ 1423ed90ef51STrond Myklebust int nfs_wb_all(struct inode *inode) 14241c75950bSTrond Myklebust { 1425ed90ef51STrond Myklebust return nfs_write_mapping(inode->i_mapping, 0); 1426ed90ef51STrond Myklebust } 14271c75950bSTrond Myklebust 1428ed90ef51STrond Myklebust int nfs_wb_nocommit(struct inode *inode) 1429ed90ef51STrond Myklebust { 1430ed90ef51STrond Myklebust return nfs_write_mapping(inode->i_mapping, FLUSH_NOCOMMIT); 14311c75950bSTrond Myklebust } 14321c75950bSTrond Myklebust 14331b3b4a1aSTrond Myklebust int nfs_wb_page_cancel(struct inode *inode, struct page *page) 14341b3b4a1aSTrond Myklebust { 14351b3b4a1aSTrond Myklebust struct nfs_page *req; 14361b3b4a1aSTrond Myklebust loff_t range_start = page_offset(page); 14371b3b4a1aSTrond Myklebust loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); 14381b3b4a1aSTrond Myklebust struct writeback_control wbc = { 14391b3b4a1aSTrond Myklebust .bdi = page->mapping->backing_dev_info, 14401b3b4a1aSTrond Myklebust .sync_mode = WB_SYNC_ALL, 14411b3b4a1aSTrond Myklebust .nr_to_write = LONG_MAX, 14421b3b4a1aSTrond Myklebust .range_start = range_start, 14431b3b4a1aSTrond Myklebust .range_end = range_end, 14441b3b4a1aSTrond Myklebust }; 14451b3b4a1aSTrond Myklebust int ret = 0; 14461b3b4a1aSTrond Myklebust 14471b3b4a1aSTrond Myklebust BUG_ON(!PageLocked(page)); 14481b3b4a1aSTrond Myklebust for (;;) { 14491b3b4a1aSTrond Myklebust req = nfs_page_find_request(page); 14501b3b4a1aSTrond Myklebust if (req == NULL) 14511b3b4a1aSTrond Myklebust goto out; 14521b3b4a1aSTrond Myklebust if (test_bit(PG_NEED_COMMIT, &req->wb_flags)) { 14531b3b4a1aSTrond Myklebust nfs_release_request(req); 14541b3b4a1aSTrond Myklebust break; 14551b3b4a1aSTrond Myklebust } 14561b3b4a1aSTrond Myklebust if (nfs_lock_request_dontget(req)) { 14571b3b4a1aSTrond Myklebust nfs_inode_remove_request(req); 14581b3b4a1aSTrond Myklebust /* 14591b3b4a1aSTrond Myklebust * In case nfs_inode_remove_request has marked the 14601b3b4a1aSTrond Myklebust * page as being dirty 14611b3b4a1aSTrond Myklebust */ 14621b3b4a1aSTrond Myklebust cancel_dirty_page(page, PAGE_CACHE_SIZE); 14631b3b4a1aSTrond Myklebust nfs_unlock_request(req); 14641b3b4a1aSTrond Myklebust break; 14651b3b4a1aSTrond Myklebust } 14661b3b4a1aSTrond Myklebust ret = nfs_wait_on_request(req); 14671b3b4a1aSTrond Myklebust if (ret < 0) 14681b3b4a1aSTrond Myklebust goto out; 14691b3b4a1aSTrond Myklebust } 14701b3b4a1aSTrond Myklebust if (!PagePrivate(page)) 14711b3b4a1aSTrond Myklebust return 0; 14721b3b4a1aSTrond Myklebust ret = nfs_sync_mapping_wait(page->mapping, &wbc, FLUSH_INVALIDATE); 14731b3b4a1aSTrond Myklebust out: 14741b3b4a1aSTrond Myklebust return ret; 14751b3b4a1aSTrond Myklebust } 14761b3b4a1aSTrond Myklebust 14775334eb13SAdrian Bunk static int nfs_wb_page_priority(struct inode *inode, struct page *page, 14785334eb13SAdrian Bunk int how) 14791c75950bSTrond Myklebust { 14801c75950bSTrond Myklebust loff_t range_start = page_offset(page); 14811c75950bSTrond Myklebust loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); 14824d770ccfSTrond Myklebust struct writeback_control wbc = { 14834d770ccfSTrond Myklebust .bdi = page->mapping->backing_dev_info, 14844d770ccfSTrond Myklebust .sync_mode = WB_SYNC_ALL, 14854d770ccfSTrond Myklebust .nr_to_write = LONG_MAX, 14864d770ccfSTrond Myklebust .range_start = range_start, 14874d770ccfSTrond Myklebust .range_end = range_end, 14884d770ccfSTrond Myklebust }; 14894d770ccfSTrond Myklebust int ret; 14901c75950bSTrond Myklebust 14914d770ccfSTrond Myklebust BUG_ON(!PageLocked(page)); 1492c63c7b05STrond Myklebust if (clear_page_dirty_for_io(page)) { 14934d770ccfSTrond Myklebust ret = nfs_writepage_locked(page, &wbc); 14944d770ccfSTrond Myklebust if (ret < 0) 14954d770ccfSTrond Myklebust goto out; 14964d770ccfSTrond Myklebust } 1497f40313acSTrond Myklebust if (!PagePrivate(page)) 1498f40313acSTrond Myklebust return 0; 14994d770ccfSTrond Myklebust ret = nfs_sync_mapping_wait(page->mapping, &wbc, how); 15004d770ccfSTrond Myklebust if (ret >= 0) 15014d770ccfSTrond Myklebust return 0; 15024d770ccfSTrond Myklebust out: 1503e507d9ebSTrond Myklebust __mark_inode_dirty(inode, I_DIRTY_PAGES); 15044d770ccfSTrond Myklebust return ret; 15051c75950bSTrond Myklebust } 15061c75950bSTrond Myklebust 15071c75950bSTrond Myklebust /* 15081c75950bSTrond Myklebust * Write back all requests on one page - we do this before reading it. 15091c75950bSTrond Myklebust */ 15101c75950bSTrond Myklebust int nfs_wb_page(struct inode *inode, struct page* page) 15111c75950bSTrond Myklebust { 15124d770ccfSTrond Myklebust return nfs_wb_page_priority(inode, page, FLUSH_STABLE); 15131c75950bSTrond Myklebust } 15141c75950bSTrond Myklebust 1515f7b422b1SDavid Howells int __init nfs_init_writepagecache(void) 15161da177e4SLinus Torvalds { 15171da177e4SLinus Torvalds nfs_wdata_cachep = kmem_cache_create("nfs_write_data", 15181da177e4SLinus Torvalds sizeof(struct nfs_write_data), 15191da177e4SLinus Torvalds 0, SLAB_HWCACHE_ALIGN, 152020c2df83SPaul Mundt NULL); 15211da177e4SLinus Torvalds if (nfs_wdata_cachep == NULL) 15221da177e4SLinus Torvalds return -ENOMEM; 15231da177e4SLinus Torvalds 152493d2341cSMatthew Dobson nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE, 15251da177e4SLinus Torvalds nfs_wdata_cachep); 15261da177e4SLinus Torvalds if (nfs_wdata_mempool == NULL) 15271da177e4SLinus Torvalds return -ENOMEM; 15281da177e4SLinus Torvalds 152993d2341cSMatthew Dobson nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT, 15301da177e4SLinus Torvalds nfs_wdata_cachep); 15311da177e4SLinus Torvalds if (nfs_commit_mempool == NULL) 15321da177e4SLinus Torvalds return -ENOMEM; 15331da177e4SLinus Torvalds 153489a09141SPeter Zijlstra /* 153589a09141SPeter Zijlstra * NFS congestion size, scale with available memory. 153689a09141SPeter Zijlstra * 153789a09141SPeter Zijlstra * 64MB: 8192k 153889a09141SPeter Zijlstra * 128MB: 11585k 153989a09141SPeter Zijlstra * 256MB: 16384k 154089a09141SPeter Zijlstra * 512MB: 23170k 154189a09141SPeter Zijlstra * 1GB: 32768k 154289a09141SPeter Zijlstra * 2GB: 46340k 154389a09141SPeter Zijlstra * 4GB: 65536k 154489a09141SPeter Zijlstra * 8GB: 92681k 154589a09141SPeter Zijlstra * 16GB: 131072k 154689a09141SPeter Zijlstra * 154789a09141SPeter Zijlstra * This allows larger machines to have larger/more transfers. 154889a09141SPeter Zijlstra * Limit the default to 256M 154989a09141SPeter Zijlstra */ 155089a09141SPeter Zijlstra nfs_congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); 155189a09141SPeter Zijlstra if (nfs_congestion_kb > 256*1024) 155289a09141SPeter Zijlstra nfs_congestion_kb = 256*1024; 155389a09141SPeter Zijlstra 15541da177e4SLinus Torvalds return 0; 15551da177e4SLinus Torvalds } 15561da177e4SLinus Torvalds 1557266bee88SDavid Brownell void nfs_destroy_writepagecache(void) 15581da177e4SLinus Torvalds { 15591da177e4SLinus Torvalds mempool_destroy(nfs_commit_mempool); 15601da177e4SLinus Torvalds mempool_destroy(nfs_wdata_mempool); 15611a1d92c1SAlexey Dobriyan kmem_cache_destroy(nfs_wdata_cachep); 15621da177e4SLinus Torvalds } 15631da177e4SLinus Torvalds 1564