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); 42f8512ad0SFred Isaman static void nfs_redirty_request(struct nfs_page *req); 43788e7a89STrond Myklebust static const struct rpc_call_ops nfs_write_partial_ops; 44788e7a89STrond Myklebust static const struct rpc_call_ops nfs_write_full_ops; 45788e7a89STrond Myklebust static const struct rpc_call_ops nfs_commit_ops; 461da177e4SLinus Torvalds 47e18b890bSChristoph Lameter static struct kmem_cache *nfs_wdata_cachep; 483feb2d49STrond Myklebust static mempool_t *nfs_wdata_mempool; 491da177e4SLinus Torvalds static mempool_t *nfs_commit_mempool; 501da177e4SLinus Torvalds 51c9d8f89dSTrond Myklebust struct nfs_write_data *nfs_commitdata_alloc(void) 521da177e4SLinus Torvalds { 53e6b4f8daSChristoph Lameter struct nfs_write_data *p = mempool_alloc(nfs_commit_mempool, GFP_NOFS); 5440859d7eSChuck Lever 551da177e4SLinus Torvalds if (p) { 561da177e4SLinus Torvalds memset(p, 0, sizeof(*p)); 571da177e4SLinus Torvalds INIT_LIST_HEAD(&p->pages); 581da177e4SLinus Torvalds } 591da177e4SLinus Torvalds return p; 601da177e4SLinus Torvalds } 611da177e4SLinus Torvalds 625e4424afSTrond Myklebust void nfs_commit_free(struct nfs_write_data *p) 631da177e4SLinus Torvalds { 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 698d5658c9STrond Myklebust struct nfs_write_data *nfs_writedata_alloc(unsigned int pagecount) 703feb2d49STrond Myklebust { 71e6b4f8daSChristoph Lameter struct nfs_write_data *p = mempool_alloc(nfs_wdata_mempool, GFP_NOFS); 723feb2d49STrond Myklebust 733feb2d49STrond Myklebust if (p) { 743feb2d49STrond Myklebust memset(p, 0, sizeof(*p)); 753feb2d49STrond Myklebust INIT_LIST_HEAD(&p->pages); 76e9f7bee1STrond Myklebust p->npages = pagecount; 770d0b5cb3SChuck Lever if (pagecount <= ARRAY_SIZE(p->page_array)) 780d0b5cb3SChuck Lever p->pagevec = p->page_array; 793feb2d49STrond Myklebust else { 800d0b5cb3SChuck Lever p->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_NOFS); 810d0b5cb3SChuck Lever if (!p->pagevec) { 823feb2d49STrond Myklebust mempool_free(p, nfs_wdata_mempool); 833feb2d49STrond Myklebust p = NULL; 843feb2d49STrond Myklebust } 853feb2d49STrond Myklebust } 863feb2d49STrond Myklebust } 873feb2d49STrond Myklebust return p; 883feb2d49STrond Myklebust } 893feb2d49STrond Myklebust 905e4424afSTrond Myklebust static void nfs_writedata_free(struct nfs_write_data *p) 913feb2d49STrond Myklebust { 923feb2d49STrond Myklebust if (p && (p->pagevec != &p->page_array[0])) 933feb2d49STrond Myklebust kfree(p->pagevec); 943feb2d49STrond Myklebust mempool_free(p, nfs_wdata_mempool); 953feb2d49STrond Myklebust } 963feb2d49STrond Myklebust 97383ba719STrond Myklebust void nfs_writedata_release(void *data) 981da177e4SLinus Torvalds { 99383ba719STrond Myklebust struct nfs_write_data *wdata = data; 100383ba719STrond Myklebust 101383ba719STrond Myklebust put_nfs_open_context(wdata->args.context); 1021da177e4SLinus Torvalds nfs_writedata_free(wdata); 1031da177e4SLinus Torvalds } 1041da177e4SLinus Torvalds 1057b159fc1STrond Myklebust static void nfs_context_set_write_error(struct nfs_open_context *ctx, int error) 1067b159fc1STrond Myklebust { 1077b159fc1STrond Myklebust ctx->error = error; 1087b159fc1STrond Myklebust smp_wmb(); 1097b159fc1STrond Myklebust set_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); 1107b159fc1STrond Myklebust } 1117b159fc1STrond Myklebust 112277459d2STrond Myklebust static struct nfs_page *nfs_page_find_request_locked(struct page *page) 113277459d2STrond Myklebust { 114277459d2STrond Myklebust struct nfs_page *req = NULL; 115277459d2STrond Myklebust 116277459d2STrond Myklebust if (PagePrivate(page)) { 117277459d2STrond Myklebust req = (struct nfs_page *)page_private(page); 118277459d2STrond Myklebust if (req != NULL) 119c03b4024STrond Myklebust kref_get(&req->wb_kref); 120277459d2STrond Myklebust } 121277459d2STrond Myklebust return req; 122277459d2STrond Myklebust } 123277459d2STrond Myklebust 124277459d2STrond Myklebust static struct nfs_page *nfs_page_find_request(struct page *page) 125277459d2STrond Myklebust { 126587142f8STrond Myklebust struct inode *inode = page->mapping->host; 127277459d2STrond Myklebust struct nfs_page *req = NULL; 128277459d2STrond Myklebust 129587142f8STrond Myklebust spin_lock(&inode->i_lock); 130277459d2STrond Myklebust req = nfs_page_find_request_locked(page); 131587142f8STrond Myklebust spin_unlock(&inode->i_lock); 132277459d2STrond Myklebust return req; 133277459d2STrond Myklebust } 134277459d2STrond Myklebust 1351da177e4SLinus Torvalds /* Adjust the file length if we're writing beyond the end */ 1361da177e4SLinus Torvalds static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int count) 1371da177e4SLinus Torvalds { 1381da177e4SLinus Torvalds struct inode *inode = page->mapping->host; 1391da177e4SLinus Torvalds loff_t end, i_size = i_size_read(inode); 140ca52fec1STrond Myklebust pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; 1411da177e4SLinus Torvalds 1421da177e4SLinus Torvalds if (i_size > 0 && page->index < end_index) 1431da177e4SLinus Torvalds return; 1441da177e4SLinus Torvalds end = ((loff_t)page->index << PAGE_CACHE_SHIFT) + ((loff_t)offset+count); 1451da177e4SLinus Torvalds if (i_size >= end) 1461da177e4SLinus Torvalds return; 14791d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_EXTENDWRITE); 1481da177e4SLinus Torvalds i_size_write(inode, end); 1491da177e4SLinus Torvalds } 1501da177e4SLinus Torvalds 151a301b777STrond Myklebust /* A writeback failed: mark the page as bad, and invalidate the page cache */ 152a301b777STrond Myklebust static void nfs_set_pageerror(struct page *page) 153a301b777STrond Myklebust { 154a301b777STrond Myklebust SetPageError(page); 155a301b777STrond Myklebust nfs_zap_mapping(page->mapping->host, page->mapping); 156a301b777STrond Myklebust } 157a301b777STrond Myklebust 1581da177e4SLinus Torvalds /* We can set the PG_uptodate flag if we see that a write request 1591da177e4SLinus Torvalds * covers the full page. 1601da177e4SLinus Torvalds */ 1611da177e4SLinus Torvalds static void nfs_mark_uptodate(struct page *page, unsigned int base, unsigned int count) 1621da177e4SLinus Torvalds { 1631da177e4SLinus Torvalds if (PageUptodate(page)) 1641da177e4SLinus Torvalds return; 1651da177e4SLinus Torvalds if (base != 0) 1661da177e4SLinus Torvalds return; 16749a70f27STrond Myklebust if (count != nfs_page_length(page)) 1681da177e4SLinus Torvalds return; 1691da177e4SLinus Torvalds SetPageUptodate(page); 1701da177e4SLinus Torvalds } 1711da177e4SLinus Torvalds 172e21195a7STrond Myklebust static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page, 1731da177e4SLinus Torvalds unsigned int offset, unsigned int count) 1741da177e4SLinus Torvalds { 1751da177e4SLinus Torvalds struct nfs_page *req; 176e21195a7STrond Myklebust int ret; 1771da177e4SLinus Torvalds 178e21195a7STrond Myklebust for (;;) { 179e21195a7STrond Myklebust req = nfs_update_request(ctx, page, offset, count); 180e21195a7STrond Myklebust if (!IS_ERR(req)) 181e21195a7STrond Myklebust break; 182e21195a7STrond Myklebust ret = PTR_ERR(req); 183e21195a7STrond Myklebust if (ret != -EBUSY) 184e21195a7STrond Myklebust return ret; 185e21195a7STrond Myklebust ret = nfs_wb_page(page->mapping->host, page); 186e21195a7STrond Myklebust if (ret != 0) 187e21195a7STrond Myklebust return ret; 188e21195a7STrond Myklebust } 1891da177e4SLinus Torvalds /* Update file length */ 1901da177e4SLinus Torvalds nfs_grow_file(page, offset, count); 191acee478aSTrond Myklebust nfs_clear_page_tag_locked(req); 192abd3e641STrond Myklebust return 0; 1931da177e4SLinus Torvalds } 1941da177e4SLinus Torvalds 1951da177e4SLinus Torvalds static int wb_priority(struct writeback_control *wbc) 1961da177e4SLinus Torvalds { 1971da177e4SLinus Torvalds if (wbc->for_reclaim) 198c63c7b05STrond Myklebust return FLUSH_HIGHPRI | FLUSH_STABLE; 1991da177e4SLinus Torvalds if (wbc->for_kupdate) 2001da177e4SLinus Torvalds return FLUSH_LOWPRI; 2011da177e4SLinus Torvalds return 0; 2021da177e4SLinus Torvalds } 2031da177e4SLinus Torvalds 2041da177e4SLinus Torvalds /* 20589a09141SPeter Zijlstra * NFS congestion control 20689a09141SPeter Zijlstra */ 20789a09141SPeter Zijlstra 20889a09141SPeter Zijlstra int nfs_congestion_kb; 20989a09141SPeter Zijlstra 21089a09141SPeter Zijlstra #define NFS_CONGESTION_ON_THRESH (nfs_congestion_kb >> (PAGE_SHIFT-10)) 21189a09141SPeter Zijlstra #define NFS_CONGESTION_OFF_THRESH \ 21289a09141SPeter Zijlstra (NFS_CONGESTION_ON_THRESH - (NFS_CONGESTION_ON_THRESH >> 2)) 21389a09141SPeter Zijlstra 2145a6d41b3STrond Myklebust static int nfs_set_page_writeback(struct page *page) 21589a09141SPeter Zijlstra { 2165a6d41b3STrond Myklebust int ret = test_set_page_writeback(page); 2175a6d41b3STrond Myklebust 2185a6d41b3STrond Myklebust if (!ret) { 21989a09141SPeter Zijlstra struct inode *inode = page->mapping->host; 22089a09141SPeter Zijlstra struct nfs_server *nfss = NFS_SERVER(inode); 22189a09141SPeter Zijlstra 222277866a0SPeter Zijlstra if (atomic_long_inc_return(&nfss->writeback) > 22389a09141SPeter Zijlstra NFS_CONGESTION_ON_THRESH) 22489a09141SPeter Zijlstra set_bdi_congested(&nfss->backing_dev_info, WRITE); 22589a09141SPeter Zijlstra } 2265a6d41b3STrond Myklebust return ret; 22789a09141SPeter Zijlstra } 22889a09141SPeter Zijlstra 22989a09141SPeter Zijlstra static void nfs_end_page_writeback(struct page *page) 23089a09141SPeter Zijlstra { 23189a09141SPeter Zijlstra struct inode *inode = page->mapping->host; 23289a09141SPeter Zijlstra struct nfs_server *nfss = NFS_SERVER(inode); 23389a09141SPeter Zijlstra 23489a09141SPeter Zijlstra end_page_writeback(page); 235c4dc4beeSPeter Zijlstra if (atomic_long_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH) 23689a09141SPeter Zijlstra clear_bdi_congested(&nfss->backing_dev_info, WRITE); 23789a09141SPeter Zijlstra } 23889a09141SPeter Zijlstra 23989a09141SPeter Zijlstra /* 240e261f51fSTrond Myklebust * Find an associated nfs write request, and prepare to flush it out 2419cccef95STrond Myklebust * May return an error if the user signalled nfs_wait_on_request(). 242e261f51fSTrond Myklebust */ 243c63c7b05STrond Myklebust static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio, 244c63c7b05STrond Myklebust struct page *page) 245e261f51fSTrond Myklebust { 246587142f8STrond Myklebust struct inode *inode = page->mapping->host; 247e261f51fSTrond Myklebust struct nfs_page *req; 248e261f51fSTrond Myklebust int ret; 249e261f51fSTrond Myklebust 250587142f8STrond Myklebust spin_lock(&inode->i_lock); 251e261f51fSTrond Myklebust for(;;) { 252e261f51fSTrond Myklebust req = nfs_page_find_request_locked(page); 253e261f51fSTrond Myklebust if (req == NULL) { 254587142f8STrond Myklebust spin_unlock(&inode->i_lock); 2559cccef95STrond Myklebust return 0; 256e261f51fSTrond Myklebust } 257acee478aSTrond Myklebust if (nfs_set_page_tag_locked(req)) 258e261f51fSTrond Myklebust break; 259e261f51fSTrond Myklebust /* Note: If we hold the page lock, as is the case in nfs_writepage, 260acee478aSTrond Myklebust * then the call to nfs_set_page_tag_locked() will always 261e261f51fSTrond Myklebust * succeed provided that someone hasn't already marked the 262e261f51fSTrond Myklebust * request as dirty (in which case we don't care). 263e261f51fSTrond Myklebust */ 264587142f8STrond Myklebust spin_unlock(&inode->i_lock); 265e261f51fSTrond Myklebust ret = nfs_wait_on_request(req); 266e261f51fSTrond Myklebust nfs_release_request(req); 267e261f51fSTrond Myklebust if (ret != 0) 268e261f51fSTrond Myklebust return ret; 269587142f8STrond Myklebust spin_lock(&inode->i_lock); 270e261f51fSTrond Myklebust } 271612c9384STrond Myklebust if (test_bit(PG_NEED_COMMIT, &req->wb_flags)) { 272612c9384STrond Myklebust /* This request is marked for commit */ 273587142f8STrond Myklebust spin_unlock(&inode->i_lock); 274acee478aSTrond Myklebust nfs_clear_page_tag_locked(req); 275c63c7b05STrond Myklebust nfs_pageio_complete(pgio); 2769cccef95STrond Myklebust return 0; 277612c9384STrond Myklebust } 278c63c7b05STrond Myklebust if (nfs_set_page_writeback(page) != 0) { 279587142f8STrond Myklebust spin_unlock(&inode->i_lock); 280c63c7b05STrond Myklebust BUG(); 281c63c7b05STrond Myklebust } 282587142f8STrond Myklebust spin_unlock(&inode->i_lock); 283f8512ad0SFred Isaman if (!nfs_pageio_add_request(pgio, req)) { 284f8512ad0SFred Isaman nfs_redirty_request(req); 285f8512ad0SFred Isaman return pgio->pg_error; 286f8512ad0SFred Isaman } 2879cccef95STrond Myklebust return 0; 288e261f51fSTrond Myklebust } 289e261f51fSTrond Myklebust 290f758c885STrond Myklebust static int nfs_do_writepage(struct page *page, struct writeback_control *wbc, struct nfs_pageio_descriptor *pgio) 291f758c885STrond Myklebust { 292f758c885STrond Myklebust struct inode *inode = page->mapping->host; 293f758c885STrond Myklebust 294f758c885STrond Myklebust nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE); 295f758c885STrond Myklebust nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1); 296f758c885STrond Myklebust 297f758c885STrond Myklebust nfs_pageio_cond_complete(pgio, page->index); 298f758c885STrond Myklebust return nfs_page_async_flush(pgio, page); 299f758c885STrond Myklebust } 300f758c885STrond Myklebust 301e261f51fSTrond Myklebust /* 3021da177e4SLinus Torvalds * Write an mmapped page to the server. 3031da177e4SLinus Torvalds */ 3044d770ccfSTrond Myklebust static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc) 3051da177e4SLinus Torvalds { 306f758c885STrond Myklebust struct nfs_pageio_descriptor pgio; 307e261f51fSTrond Myklebust int err; 3081da177e4SLinus Torvalds 309f758c885STrond Myklebust nfs_pageio_init_write(&pgio, page->mapping->host, wb_priority(wbc)); 310f758c885STrond Myklebust err = nfs_do_writepage(page, wbc, &pgio); 311f758c885STrond Myklebust nfs_pageio_complete(&pgio); 312f758c885STrond Myklebust if (err < 0) 3134d770ccfSTrond Myklebust return err; 314f758c885STrond Myklebust if (pgio.pg_error < 0) 315f758c885STrond Myklebust return pgio.pg_error; 316f758c885STrond Myklebust return 0; 3174d770ccfSTrond Myklebust } 3184d770ccfSTrond Myklebust 3194d770ccfSTrond Myklebust int nfs_writepage(struct page *page, struct writeback_control *wbc) 3204d770ccfSTrond Myklebust { 321f758c885STrond Myklebust int ret; 3224d770ccfSTrond Myklebust 323f758c885STrond Myklebust ret = nfs_writepage_locked(page, wbc); 3241da177e4SLinus Torvalds unlock_page(page); 325f758c885STrond Myklebust return ret; 326f758c885STrond Myklebust } 327f758c885STrond Myklebust 328f758c885STrond Myklebust static int nfs_writepages_callback(struct page *page, struct writeback_control *wbc, void *data) 329f758c885STrond Myklebust { 330f758c885STrond Myklebust int ret; 331f758c885STrond Myklebust 332f758c885STrond Myklebust ret = nfs_do_writepage(page, wbc, data); 333f758c885STrond Myklebust unlock_page(page); 334f758c885STrond Myklebust return ret; 3351da177e4SLinus Torvalds } 3361da177e4SLinus Torvalds 3371da177e4SLinus Torvalds int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc) 3381da177e4SLinus Torvalds { 3391da177e4SLinus Torvalds struct inode *inode = mapping->host; 340c63c7b05STrond Myklebust struct nfs_pageio_descriptor pgio; 3411da177e4SLinus Torvalds int err; 3421da177e4SLinus Torvalds 34391d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES); 34491d5b470SChuck Lever 345c63c7b05STrond Myklebust nfs_pageio_init_write(&pgio, inode, wb_priority(wbc)); 346f758c885STrond Myklebust err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio); 347c63c7b05STrond Myklebust nfs_pageio_complete(&pgio); 348f758c885STrond Myklebust if (err < 0) 3491da177e4SLinus Torvalds return err; 350f758c885STrond Myklebust if (pgio.pg_error < 0) 351c63c7b05STrond Myklebust return pgio.pg_error; 352c63c7b05STrond Myklebust return 0; 3531da177e4SLinus Torvalds } 3541da177e4SLinus Torvalds 3551da177e4SLinus Torvalds /* 3561da177e4SLinus Torvalds * Insert a write request into an inode 3571da177e4SLinus Torvalds */ 35827852596SNick Piggin static void nfs_inode_add_request(struct inode *inode, struct nfs_page *req) 3591da177e4SLinus Torvalds { 3601da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 3611da177e4SLinus Torvalds int error; 3621da177e4SLinus Torvalds 3631da177e4SLinus Torvalds error = radix_tree_insert(&nfsi->nfs_page_tree, req->wb_index, req); 36427852596SNick Piggin BUG_ON(error); 3651da177e4SLinus Torvalds if (!nfsi->npages) { 3661da177e4SLinus Torvalds igrab(inode); 3671da177e4SLinus Torvalds if (nfs_have_delegation(inode, FMODE_WRITE)) 3681da177e4SLinus Torvalds nfsi->change_attr++; 3691da177e4SLinus Torvalds } 370deb7d638STrond Myklebust SetPagePrivate(req->wb_page); 371277459d2STrond Myklebust set_page_private(req->wb_page, (unsigned long)req); 3721da177e4SLinus Torvalds nfsi->npages++; 373c03b4024STrond Myklebust kref_get(&req->wb_kref); 37427852596SNick Piggin radix_tree_tag_set(&nfsi->nfs_page_tree, req->wb_index, 37527852596SNick Piggin NFS_PAGE_TAG_LOCKED); 3761da177e4SLinus Torvalds } 3771da177e4SLinus Torvalds 3781da177e4SLinus Torvalds /* 37989a09141SPeter Zijlstra * Remove a write request from an inode 3801da177e4SLinus Torvalds */ 3811da177e4SLinus Torvalds static void nfs_inode_remove_request(struct nfs_page *req) 3821da177e4SLinus Torvalds { 38388be9f99STrond Myklebust struct inode *inode = req->wb_context->path.dentry->d_inode; 3841da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 3851da177e4SLinus Torvalds 3861da177e4SLinus Torvalds BUG_ON (!NFS_WBACK_BUSY(req)); 3871da177e4SLinus Torvalds 388587142f8STrond Myklebust spin_lock(&inode->i_lock); 389277459d2STrond Myklebust set_page_private(req->wb_page, 0); 390deb7d638STrond Myklebust ClearPagePrivate(req->wb_page); 3911da177e4SLinus Torvalds radix_tree_delete(&nfsi->nfs_page_tree, req->wb_index); 3921da177e4SLinus Torvalds nfsi->npages--; 3931da177e4SLinus Torvalds if (!nfsi->npages) { 394587142f8STrond Myklebust spin_unlock(&inode->i_lock); 3951da177e4SLinus Torvalds iput(inode); 3961da177e4SLinus Torvalds } else 397587142f8STrond Myklebust spin_unlock(&inode->i_lock); 3981da177e4SLinus Torvalds nfs_clear_request(req); 3991da177e4SLinus Torvalds nfs_release_request(req); 4001da177e4SLinus Torvalds } 4011da177e4SLinus Torvalds 40261822ab5STrond Myklebust static void 4036d884e8fSFred nfs_mark_request_dirty(struct nfs_page *req) 40461822ab5STrond Myklebust { 40561822ab5STrond Myklebust __set_page_dirty_nobuffers(req->wb_page); 40661822ab5STrond Myklebust } 40761822ab5STrond Myklebust 4081da177e4SLinus Torvalds /* 4091da177e4SLinus Torvalds * Check if a request is dirty 4101da177e4SLinus Torvalds */ 4111da177e4SLinus Torvalds static inline int 4121da177e4SLinus Torvalds nfs_dirty_request(struct nfs_page *req) 4131da177e4SLinus Torvalds { 4145a6d41b3STrond Myklebust struct page *page = req->wb_page; 4155a6d41b3STrond Myklebust 416612c9384STrond Myklebust if (page == NULL || test_bit(PG_NEED_COMMIT, &req->wb_flags)) 4175a6d41b3STrond Myklebust return 0; 41838def50fSFred Isaman return !PageWriteback(page); 4191da177e4SLinus Torvalds } 4201da177e4SLinus Torvalds 4211da177e4SLinus Torvalds #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) 4221da177e4SLinus Torvalds /* 4231da177e4SLinus Torvalds * Add a request to the inode's commit list. 4241da177e4SLinus Torvalds */ 4251da177e4SLinus Torvalds static void 4261da177e4SLinus Torvalds nfs_mark_request_commit(struct nfs_page *req) 4271da177e4SLinus Torvalds { 42888be9f99STrond Myklebust struct inode *inode = req->wb_context->path.dentry->d_inode; 4291da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 4301da177e4SLinus Torvalds 431587142f8STrond Myklebust spin_lock(&inode->i_lock); 4321da177e4SLinus Torvalds nfsi->ncommit++; 433612c9384STrond Myklebust set_bit(PG_NEED_COMMIT, &(req)->wb_flags); 4345c369683STrond Myklebust radix_tree_tag_set(&nfsi->nfs_page_tree, 4355c369683STrond Myklebust req->wb_index, 4365c369683STrond Myklebust NFS_PAGE_TAG_COMMIT); 437587142f8STrond Myklebust spin_unlock(&inode->i_lock); 438fd39fc85SChristoph Lameter inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); 439c9e51e41SPeter Zijlstra inc_bdi_stat(req->wb_page->mapping->backing_dev_info, BDI_RECLAIMABLE); 440a1803044STrond Myklebust __mark_inode_dirty(inode, I_DIRTY_DATASYNC); 4411da177e4SLinus Torvalds } 4428e821cadSTrond Myklebust 4438e821cadSTrond Myklebust static inline 4448e821cadSTrond Myklebust int nfs_write_need_commit(struct nfs_write_data *data) 4458e821cadSTrond Myklebust { 4468e821cadSTrond Myklebust return data->verf.committed != NFS_FILE_SYNC; 4478e821cadSTrond Myklebust } 4488e821cadSTrond Myklebust 4498e821cadSTrond Myklebust static inline 4508e821cadSTrond Myklebust int nfs_reschedule_unstable_write(struct nfs_page *req) 4518e821cadSTrond Myklebust { 452612c9384STrond Myklebust if (test_bit(PG_NEED_COMMIT, &req->wb_flags)) { 4538e821cadSTrond Myklebust nfs_mark_request_commit(req); 4548e821cadSTrond Myklebust return 1; 4558e821cadSTrond Myklebust } 4568e821cadSTrond Myklebust if (test_and_clear_bit(PG_NEED_RESCHED, &req->wb_flags)) { 4576d884e8fSFred nfs_mark_request_dirty(req); 4588e821cadSTrond Myklebust return 1; 4598e821cadSTrond Myklebust } 4608e821cadSTrond Myklebust return 0; 4618e821cadSTrond Myklebust } 4628e821cadSTrond Myklebust #else 4638e821cadSTrond Myklebust static inline void 4648e821cadSTrond Myklebust nfs_mark_request_commit(struct nfs_page *req) 4658e821cadSTrond Myklebust { 4668e821cadSTrond Myklebust } 4678e821cadSTrond Myklebust 4688e821cadSTrond Myklebust static inline 4698e821cadSTrond Myklebust int nfs_write_need_commit(struct nfs_write_data *data) 4708e821cadSTrond Myklebust { 4718e821cadSTrond Myklebust return 0; 4728e821cadSTrond Myklebust } 4738e821cadSTrond Myklebust 4748e821cadSTrond Myklebust static inline 4758e821cadSTrond Myklebust int nfs_reschedule_unstable_write(struct nfs_page *req) 4768e821cadSTrond Myklebust { 4778e821cadSTrond Myklebust return 0; 4788e821cadSTrond Myklebust } 4791da177e4SLinus Torvalds #endif 4801da177e4SLinus Torvalds 4811da177e4SLinus Torvalds /* 4821da177e4SLinus Torvalds * Wait for a request to complete. 4831da177e4SLinus Torvalds * 484150030b7SMatthew Wilcox * Interruptible by fatal signals only. 4851da177e4SLinus Torvalds */ 486ca52fec1STrond Myklebust static int nfs_wait_on_requests_locked(struct inode *inode, pgoff_t idx_start, unsigned int npages) 4871da177e4SLinus Torvalds { 4881da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 4891da177e4SLinus Torvalds struct nfs_page *req; 490ca52fec1STrond Myklebust pgoff_t idx_end, next; 4911da177e4SLinus Torvalds unsigned int res = 0; 4921da177e4SLinus Torvalds int error; 4931da177e4SLinus Torvalds 4941da177e4SLinus Torvalds if (npages == 0) 4951da177e4SLinus Torvalds idx_end = ~0; 4961da177e4SLinus Torvalds else 4971da177e4SLinus Torvalds idx_end = idx_start + npages - 1; 4981da177e4SLinus Torvalds 4991da177e4SLinus Torvalds next = idx_start; 5009fd367f0STrond Myklebust while (radix_tree_gang_lookup_tag(&nfsi->nfs_page_tree, (void **)&req, next, 1, NFS_PAGE_TAG_LOCKED)) { 5011da177e4SLinus Torvalds if (req->wb_index > idx_end) 5021da177e4SLinus Torvalds break; 5031da177e4SLinus Torvalds 5041da177e4SLinus Torvalds next = req->wb_index + 1; 505c6a556b8STrond Myklebust BUG_ON(!NFS_WBACK_BUSY(req)); 5061da177e4SLinus Torvalds 507c03b4024STrond Myklebust kref_get(&req->wb_kref); 508587142f8STrond Myklebust spin_unlock(&inode->i_lock); 5091da177e4SLinus Torvalds error = nfs_wait_on_request(req); 5101da177e4SLinus Torvalds nfs_release_request(req); 511587142f8STrond Myklebust spin_lock(&inode->i_lock); 5121da177e4SLinus Torvalds if (error < 0) 5131da177e4SLinus Torvalds return error; 5141da177e4SLinus Torvalds res++; 5151da177e4SLinus Torvalds } 5161da177e4SLinus Torvalds return res; 5171da177e4SLinus Torvalds } 5181da177e4SLinus Torvalds 51983715ad5STrond Myklebust static void nfs_cancel_commit_list(struct list_head *head) 52083715ad5STrond Myklebust { 52183715ad5STrond Myklebust struct nfs_page *req; 52283715ad5STrond Myklebust 52383715ad5STrond Myklebust while(!list_empty(head)) { 52483715ad5STrond Myklebust req = nfs_list_entry(head->next); 525b6dff26aSTrond Myklebust dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); 526c9e51e41SPeter Zijlstra dec_bdi_stat(req->wb_page->mapping->backing_dev_info, 527c9e51e41SPeter Zijlstra BDI_RECLAIMABLE); 52883715ad5STrond Myklebust nfs_list_remove_request(req); 529612c9384STrond Myklebust clear_bit(PG_NEED_COMMIT, &(req)->wb_flags); 53083715ad5STrond Myklebust nfs_inode_remove_request(req); 531b6dff26aSTrond Myklebust nfs_unlock_request(req); 53283715ad5STrond Myklebust } 53383715ad5STrond Myklebust } 53483715ad5STrond Myklebust 5351da177e4SLinus Torvalds #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) 5361da177e4SLinus Torvalds /* 5371da177e4SLinus Torvalds * nfs_scan_commit - Scan an inode for commit requests 5381da177e4SLinus Torvalds * @inode: NFS inode to scan 5391da177e4SLinus Torvalds * @dst: destination list 5401da177e4SLinus Torvalds * @idx_start: lower bound of page->index to scan. 5411da177e4SLinus Torvalds * @npages: idx_start + npages sets the upper bound to scan. 5421da177e4SLinus Torvalds * 5431da177e4SLinus Torvalds * Moves requests from the inode's 'commit' request list. 5441da177e4SLinus Torvalds * The requests are *not* checked to ensure that they form a contiguous set. 5451da177e4SLinus Torvalds */ 5461da177e4SLinus Torvalds static int 547ca52fec1STrond Myklebust nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, unsigned int npages) 5481da177e4SLinus Torvalds { 5491da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 5503da28eb1STrond Myklebust int res = 0; 5513da28eb1STrond Myklebust 5523da28eb1STrond Myklebust if (nfsi->ncommit != 0) { 5535c369683STrond Myklebust res = nfs_scan_list(nfsi, dst, idx_start, npages, 5545c369683STrond Myklebust NFS_PAGE_TAG_COMMIT); 5551da177e4SLinus Torvalds nfsi->ncommit -= res; 5563da28eb1STrond Myklebust } 5571da177e4SLinus Torvalds return res; 5581da177e4SLinus Torvalds } 559c42de9ddSTrond Myklebust #else 560ca52fec1STrond Myklebust static inline int nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, unsigned int npages) 561c42de9ddSTrond Myklebust { 562c42de9ddSTrond Myklebust return 0; 563c42de9ddSTrond Myklebust } 5641da177e4SLinus Torvalds #endif 5651da177e4SLinus Torvalds 5661da177e4SLinus Torvalds /* 5671da177e4SLinus Torvalds * Try to update any existing write request, or create one if there is none. 5681da177e4SLinus Torvalds * In order to match, the request's credentials must match those of 5691da177e4SLinus Torvalds * the calling process. 5701da177e4SLinus Torvalds * 5711da177e4SLinus Torvalds * Note: Should always be called with the Page Lock held! 5721da177e4SLinus Torvalds */ 5731da177e4SLinus Torvalds static struct nfs_page * nfs_update_request(struct nfs_open_context* ctx, 574e21195a7STrond Myklebust struct page *page, unsigned int offset, unsigned int bytes) 5751da177e4SLinus Torvalds { 57689a09141SPeter Zijlstra struct address_space *mapping = page->mapping; 57789a09141SPeter Zijlstra struct inode *inode = mapping->host; 5781da177e4SLinus Torvalds struct nfs_page *req, *new = NULL; 579ca52fec1STrond Myklebust pgoff_t rqend, end; 5801da177e4SLinus Torvalds 5811da177e4SLinus Torvalds end = offset + bytes; 5821da177e4SLinus Torvalds 5831da177e4SLinus Torvalds for (;;) { 5841da177e4SLinus Torvalds /* Loop over all inode entries and see if we find 5851da177e4SLinus Torvalds * A request for the page we wish to update 5861da177e4SLinus Torvalds */ 587587142f8STrond Myklebust spin_lock(&inode->i_lock); 588277459d2STrond Myklebust req = nfs_page_find_request_locked(page); 5891da177e4SLinus Torvalds if (req) { 590acee478aSTrond Myklebust if (!nfs_set_page_tag_locked(req)) { 5911da177e4SLinus Torvalds int error; 592277459d2STrond Myklebust 593587142f8STrond Myklebust spin_unlock(&inode->i_lock); 5941da177e4SLinus Torvalds error = nfs_wait_on_request(req); 5951da177e4SLinus Torvalds nfs_release_request(req); 5961dd594b2SNeil Brown if (error < 0) { 59727852596SNick Piggin if (new) { 59827852596SNick Piggin radix_tree_preload_end(); 5991dd594b2SNeil Brown nfs_release_request(new); 60027852596SNick Piggin } 6011da177e4SLinus Torvalds return ERR_PTR(error); 6021dd594b2SNeil Brown } 6031da177e4SLinus Torvalds continue; 6041da177e4SLinus Torvalds } 605587142f8STrond Myklebust spin_unlock(&inode->i_lock); 60627852596SNick Piggin if (new) { 60727852596SNick Piggin radix_tree_preload_end(); 6081da177e4SLinus Torvalds nfs_release_request(new); 60927852596SNick Piggin } 6101da177e4SLinus Torvalds break; 6111da177e4SLinus Torvalds } 6121da177e4SLinus Torvalds 6131da177e4SLinus Torvalds if (new) { 6141da177e4SLinus Torvalds nfs_lock_request_dontget(new); 61527852596SNick Piggin nfs_inode_add_request(inode, new); 616587142f8STrond Myklebust spin_unlock(&inode->i_lock); 61727852596SNick Piggin radix_tree_preload_end(); 61861e930a9STrond Myklebust req = new; 61961e930a9STrond Myklebust goto zero_page; 6201da177e4SLinus Torvalds } 621587142f8STrond Myklebust spin_unlock(&inode->i_lock); 6221da177e4SLinus Torvalds 6231da177e4SLinus Torvalds new = nfs_create_request(ctx, inode, page, offset, bytes); 6241da177e4SLinus Torvalds if (IS_ERR(new)) 6251da177e4SLinus Torvalds return new; 626f3d47a3aSTrond Myklebust if (radix_tree_preload(GFP_NOFS)) { 627f3d47a3aSTrond Myklebust nfs_release_request(new); 628f3d47a3aSTrond Myklebust return ERR_PTR(-ENOMEM); 629f3d47a3aSTrond Myklebust } 6301da177e4SLinus Torvalds } 6311da177e4SLinus Torvalds 6321da177e4SLinus Torvalds /* We have a request for our page. 6331da177e4SLinus Torvalds * If the creds don't match, or the 6341da177e4SLinus Torvalds * page addresses don't match, 6351da177e4SLinus Torvalds * tell the caller to wait on the conflicting 6361da177e4SLinus Torvalds * request. 6371da177e4SLinus Torvalds */ 6381da177e4SLinus Torvalds rqend = req->wb_offset + req->wb_bytes; 6391da177e4SLinus Torvalds if (req->wb_context != ctx 6401da177e4SLinus Torvalds || req->wb_page != page 6411da177e4SLinus Torvalds || !nfs_dirty_request(req) 6421da177e4SLinus Torvalds || offset > rqend || end < req->wb_offset) { 643acee478aSTrond Myklebust nfs_clear_page_tag_locked(req); 6441da177e4SLinus Torvalds return ERR_PTR(-EBUSY); 6451da177e4SLinus Torvalds } 6461da177e4SLinus Torvalds 6471da177e4SLinus Torvalds /* Okay, the request matches. Update the region */ 6481da177e4SLinus Torvalds if (offset < req->wb_offset) { 6491da177e4SLinus Torvalds req->wb_offset = offset; 6501da177e4SLinus Torvalds req->wb_pgbase = offset; 65161e930a9STrond Myklebust req->wb_bytes = max(end, rqend) - req->wb_offset; 65261e930a9STrond Myklebust goto zero_page; 6531da177e4SLinus Torvalds } 6541da177e4SLinus Torvalds 6551da177e4SLinus Torvalds if (end > rqend) 6561da177e4SLinus Torvalds req->wb_bytes = end - req->wb_offset; 6571da177e4SLinus Torvalds 6581da177e4SLinus Torvalds return req; 65961e930a9STrond Myklebust zero_page: 66061e930a9STrond Myklebust /* If this page might potentially be marked as up to date, 66161e930a9STrond Myklebust * then we need to zero any uninitalised data. */ 66261e930a9STrond Myklebust if (req->wb_pgbase == 0 && req->wb_bytes != PAGE_CACHE_SIZE 66361e930a9STrond Myklebust && !PageUptodate(req->wb_page)) 664eebd2aa3SChristoph Lameter zero_user_segment(req->wb_page, req->wb_bytes, PAGE_CACHE_SIZE); 66561e930a9STrond Myklebust return req; 6661da177e4SLinus Torvalds } 6671da177e4SLinus Torvalds 6681da177e4SLinus Torvalds int nfs_flush_incompatible(struct file *file, struct page *page) 6691da177e4SLinus Torvalds { 670cd3758e3STrond Myklebust struct nfs_open_context *ctx = nfs_file_open_context(file); 6711da177e4SLinus Torvalds struct nfs_page *req; 6721a54533eSTrond Myklebust int do_flush, status; 6731da177e4SLinus Torvalds /* 6741da177e4SLinus Torvalds * Look for a request corresponding to this page. If there 6751da177e4SLinus Torvalds * is one, and it belongs to another file, we flush it out 6761da177e4SLinus Torvalds * before we try to copy anything into the page. Do this 6771da177e4SLinus Torvalds * due to the lack of an ACCESS-type call in NFSv2. 6781da177e4SLinus Torvalds * Also do the same if we find a request from an existing 6791da177e4SLinus Torvalds * dropped page. 6801da177e4SLinus Torvalds */ 6811a54533eSTrond Myklebust do { 682277459d2STrond Myklebust req = nfs_page_find_request(page); 6831a54533eSTrond Myklebust if (req == NULL) 6841a54533eSTrond Myklebust return 0; 6851a54533eSTrond Myklebust do_flush = req->wb_page != page || req->wb_context != ctx 686e261f51fSTrond Myklebust || !nfs_dirty_request(req); 6871da177e4SLinus Torvalds nfs_release_request(req); 6881a54533eSTrond Myklebust if (!do_flush) 6891a54533eSTrond Myklebust return 0; 690277459d2STrond Myklebust status = nfs_wb_page(page->mapping->host, page); 6911a54533eSTrond Myklebust } while (status == 0); 6921a54533eSTrond Myklebust return status; 6931da177e4SLinus Torvalds } 6941da177e4SLinus Torvalds 6951da177e4SLinus Torvalds /* 6965d47a356STrond Myklebust * If the page cache is marked as unsafe or invalid, then we can't rely on 6975d47a356STrond Myklebust * the PageUptodate() flag. In this case, we will need to turn off 6985d47a356STrond Myklebust * write optimisations that depend on the page contents being correct. 6995d47a356STrond Myklebust */ 7005d47a356STrond Myklebust static int nfs_write_pageuptodate(struct page *page, struct inode *inode) 7015d47a356STrond Myklebust { 7025d47a356STrond Myklebust return PageUptodate(page) && 7035d47a356STrond Myklebust !(NFS_I(inode)->cache_validity & (NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA)); 7045d47a356STrond Myklebust } 7055d47a356STrond Myklebust 7065d47a356STrond Myklebust /* 7071da177e4SLinus Torvalds * Update and possibly write a cached page of an NFS file. 7081da177e4SLinus Torvalds * 7091da177e4SLinus Torvalds * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad 7101da177e4SLinus Torvalds * things with a page scheduled for an RPC call (e.g. invalidate it). 7111da177e4SLinus Torvalds */ 7121da177e4SLinus Torvalds int nfs_updatepage(struct file *file, struct page *page, 7131da177e4SLinus Torvalds unsigned int offset, unsigned int count) 7141da177e4SLinus Torvalds { 715cd3758e3STrond Myklebust struct nfs_open_context *ctx = nfs_file_open_context(file); 7161da177e4SLinus Torvalds struct inode *inode = page->mapping->host; 7171da177e4SLinus Torvalds int status = 0; 7181da177e4SLinus Torvalds 71991d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE); 72091d5b470SChuck Lever 7211da177e4SLinus Torvalds dprintk("NFS: nfs_updatepage(%s/%s %d@%Ld)\n", 72201cce933SJosef "Jeff" Sipek file->f_path.dentry->d_parent->d_name.name, 72301cce933SJosef "Jeff" Sipek file->f_path.dentry->d_name.name, count, 7240bbacc40SChuck Lever (long long)(page_offset(page) +offset)); 7251da177e4SLinus Torvalds 7261da177e4SLinus Torvalds /* If we're not using byte range locks, and we know the page 7275d47a356STrond Myklebust * is up to date, it may be more efficient to extend the write 7285d47a356STrond Myklebust * to cover the entire page in order to avoid fragmentation 7295d47a356STrond Myklebust * inefficiencies. 7301da177e4SLinus Torvalds */ 7315d47a356STrond Myklebust if (nfs_write_pageuptodate(page, inode) && 7325d47a356STrond Myklebust inode->i_flock == NULL && 7334b5621f6STrond Myklebust !(file->f_flags & O_SYNC)) { 73449a70f27STrond Myklebust count = max(count + offset, nfs_page_length(page)); 7351da177e4SLinus Torvalds offset = 0; 7361da177e4SLinus Torvalds } 7371da177e4SLinus Torvalds 738e21195a7STrond Myklebust status = nfs_writepage_setup(ctx, page, offset, count); 73903fa9e84STrond Myklebust if (status < 0) 74003fa9e84STrond Myklebust nfs_set_pageerror(page); 74103fa9e84STrond Myklebust else 742e261f51fSTrond Myklebust __set_page_dirty_nobuffers(page); 7431da177e4SLinus Torvalds 7441da177e4SLinus Torvalds dprintk("NFS: nfs_updatepage returns %d (isize %Ld)\n", 7451da177e4SLinus Torvalds status, (long long)i_size_read(inode)); 7461da177e4SLinus Torvalds return status; 7471da177e4SLinus Torvalds } 7481da177e4SLinus Torvalds 7491da177e4SLinus Torvalds static void nfs_writepage_release(struct nfs_page *req) 7501da177e4SLinus Torvalds { 7518e821cadSTrond Myklebust 75244dd151dSTrond Myklebust if (PageError(req->wb_page)) { 75344dd151dSTrond Myklebust nfs_end_page_writeback(req->wb_page); 75444dd151dSTrond Myklebust nfs_inode_remove_request(req); 75544dd151dSTrond Myklebust } else if (!nfs_reschedule_unstable_write(req)) { 75644dd151dSTrond Myklebust /* Set the PG_uptodate flag */ 75744dd151dSTrond Myklebust nfs_mark_uptodate(req->wb_page, req->wb_pgbase, req->wb_bytes); 75889a09141SPeter Zijlstra nfs_end_page_writeback(req->wb_page); 7591da177e4SLinus Torvalds nfs_inode_remove_request(req); 7608e821cadSTrond Myklebust } else 7618e821cadSTrond Myklebust nfs_end_page_writeback(req->wb_page); 7629fd367f0STrond Myklebust nfs_clear_page_tag_locked(req); 7631da177e4SLinus Torvalds } 7641da177e4SLinus Torvalds 7653ff7576dSTrond Myklebust static int flush_task_priority(int how) 7661da177e4SLinus Torvalds { 7671da177e4SLinus Torvalds switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) { 7681da177e4SLinus Torvalds case FLUSH_HIGHPRI: 7691da177e4SLinus Torvalds return RPC_PRIORITY_HIGH; 7701da177e4SLinus Torvalds case FLUSH_LOWPRI: 7711da177e4SLinus Torvalds return RPC_PRIORITY_LOW; 7721da177e4SLinus Torvalds } 7731da177e4SLinus Torvalds return RPC_PRIORITY_NORMAL; 7741da177e4SLinus Torvalds } 7751da177e4SLinus Torvalds 7761da177e4SLinus Torvalds /* 7771da177e4SLinus Torvalds * Set up the argument/result storage required for the RPC call. 7781da177e4SLinus Torvalds */ 779dbae4c73STrond Myklebust static int nfs_write_rpcsetup(struct nfs_page *req, 7801da177e4SLinus Torvalds struct nfs_write_data *data, 781788e7a89STrond Myklebust const struct rpc_call_ops *call_ops, 7821da177e4SLinus Torvalds unsigned int count, unsigned int offset, 7831da177e4SLinus Torvalds int how) 7841da177e4SLinus Torvalds { 78584115e1cSTrond Myklebust struct inode *inode = req->wb_context->path.dentry->d_inode; 78684115e1cSTrond Myklebust int flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; 7873ff7576dSTrond Myklebust int priority = flush_task_priority(how); 78807737691STrond Myklebust struct rpc_task *task; 789bdc7f021STrond Myklebust struct rpc_message msg = { 790bdc7f021STrond Myklebust .rpc_argp = &data->args, 791bdc7f021STrond Myklebust .rpc_resp = &data->res, 792bdc7f021STrond Myklebust .rpc_cred = req->wb_context->cred, 793bdc7f021STrond Myklebust }; 79484115e1cSTrond Myklebust struct rpc_task_setup task_setup_data = { 79584115e1cSTrond Myklebust .rpc_client = NFS_CLIENT(inode), 79607737691STrond Myklebust .task = &data->task, 797bdc7f021STrond Myklebust .rpc_message = &msg, 79884115e1cSTrond Myklebust .callback_ops = call_ops, 79984115e1cSTrond Myklebust .callback_data = data, 800101070caSTrond Myklebust .workqueue = nfsiod_workqueue, 80184115e1cSTrond Myklebust .flags = flags, 8023ff7576dSTrond Myklebust .priority = priority, 80384115e1cSTrond Myklebust }; 8041da177e4SLinus Torvalds 8051da177e4SLinus Torvalds /* Set up the RPC argument and reply structs 8061da177e4SLinus Torvalds * NB: take care not to mess about with data->commit et al. */ 8071da177e4SLinus Torvalds 8081da177e4SLinus Torvalds data->req = req; 80988be9f99STrond Myklebust data->inode = inode = req->wb_context->path.dentry->d_inode; 810bdc7f021STrond Myklebust data->cred = msg.rpc_cred; 8111da177e4SLinus Torvalds 8121da177e4SLinus Torvalds data->args.fh = NFS_FH(inode); 8131da177e4SLinus Torvalds data->args.offset = req_offset(req) + offset; 8141da177e4SLinus Torvalds data->args.pgbase = req->wb_pgbase + offset; 8151da177e4SLinus Torvalds data->args.pages = data->pagevec; 8161da177e4SLinus Torvalds data->args.count = count; 817383ba719STrond Myklebust data->args.context = get_nfs_open_context(req->wb_context); 818bdc7f021STrond Myklebust data->args.stable = NFS_UNSTABLE; 819bdc7f021STrond Myklebust if (how & FLUSH_STABLE) { 820bdc7f021STrond Myklebust data->args.stable = NFS_DATA_SYNC; 821bdc7f021STrond Myklebust if (!NFS_I(inode)->ncommit) 822bdc7f021STrond Myklebust data->args.stable = NFS_FILE_SYNC; 823bdc7f021STrond Myklebust } 8241da177e4SLinus Torvalds 8251da177e4SLinus Torvalds data->res.fattr = &data->fattr; 8261da177e4SLinus Torvalds data->res.count = count; 8271da177e4SLinus Torvalds data->res.verf = &data->verf; 8280e574af1STrond Myklebust nfs_fattr_init(&data->fattr); 8291da177e4SLinus Torvalds 830788e7a89STrond Myklebust /* Set up the initial task struct. */ 831bdc7f021STrond Myklebust NFS_PROTO(inode)->write_setup(data, &msg); 8321da177e4SLinus Torvalds 833a3f565b1SChuck Lever dprintk("NFS: %5u initiated write call " 834a3f565b1SChuck Lever "(req %s/%Ld, %u bytes @ offset %Lu)\n", 8350bbacc40SChuck Lever data->task.tk_pid, 8361da177e4SLinus Torvalds inode->i_sb->s_id, 8371da177e4SLinus Torvalds (long long)NFS_FILEID(inode), 8381da177e4SLinus Torvalds count, 8391da177e4SLinus Torvalds (unsigned long long)data->args.offset); 8401da177e4SLinus Torvalds 84107737691STrond Myklebust task = rpc_run_task(&task_setup_data); 842dbae4c73STrond Myklebust if (IS_ERR(task)) 843dbae4c73STrond Myklebust return PTR_ERR(task); 84407737691STrond Myklebust rpc_put_task(task); 845dbae4c73STrond Myklebust return 0; 8461da177e4SLinus Torvalds } 8471da177e4SLinus Torvalds 8486d884e8fSFred /* If a nfs_flush_* function fails, it should remove reqs from @head and 8496d884e8fSFred * call this on each, which will prepare them to be retried on next 8506d884e8fSFred * writeback using standard nfs. 8516d884e8fSFred */ 8526d884e8fSFred static void nfs_redirty_request(struct nfs_page *req) 8536d884e8fSFred { 8546d884e8fSFred nfs_mark_request_dirty(req); 8556d884e8fSFred nfs_end_page_writeback(req->wb_page); 8566d884e8fSFred nfs_clear_page_tag_locked(req); 8576d884e8fSFred } 8586d884e8fSFred 8591da177e4SLinus Torvalds /* 8601da177e4SLinus Torvalds * Generate multiple small requests to write out a single 8611da177e4SLinus Torvalds * contiguous dirty area on one page. 8621da177e4SLinus Torvalds */ 8638d5658c9STrond Myklebust static int nfs_flush_multi(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int how) 8641da177e4SLinus Torvalds { 8651da177e4SLinus Torvalds struct nfs_page *req = nfs_list_entry(head->next); 8661da177e4SLinus Torvalds struct page *page = req->wb_page; 8671da177e4SLinus Torvalds struct nfs_write_data *data; 868e9f7bee1STrond Myklebust size_t wsize = NFS_SERVER(inode)->wsize, nbytes; 869e9f7bee1STrond Myklebust unsigned int offset; 8701da177e4SLinus Torvalds int requests = 0; 871dbae4c73STrond Myklebust int ret = 0; 8721da177e4SLinus Torvalds LIST_HEAD(list); 8731da177e4SLinus Torvalds 8741da177e4SLinus Torvalds nfs_list_remove_request(req); 8751da177e4SLinus Torvalds 876bcb71bbaSTrond Myklebust nbytes = count; 877e9f7bee1STrond Myklebust do { 878e9f7bee1STrond Myklebust size_t len = min(nbytes, wsize); 879e9f7bee1STrond Myklebust 8808d5658c9STrond Myklebust data = nfs_writedata_alloc(1); 8811da177e4SLinus Torvalds if (!data) 8821da177e4SLinus Torvalds goto out_bad; 8831da177e4SLinus Torvalds list_add(&data->pages, &list); 8841da177e4SLinus Torvalds requests++; 885e9f7bee1STrond Myklebust nbytes -= len; 886e9f7bee1STrond Myklebust } while (nbytes != 0); 8871da177e4SLinus Torvalds atomic_set(&req->wb_complete, requests); 8881da177e4SLinus Torvalds 8891da177e4SLinus Torvalds ClearPageError(page); 8901da177e4SLinus Torvalds offset = 0; 891bcb71bbaSTrond Myklebust nbytes = count; 8921da177e4SLinus Torvalds do { 893dbae4c73STrond Myklebust int ret2; 894dbae4c73STrond Myklebust 8951da177e4SLinus Torvalds data = list_entry(list.next, struct nfs_write_data, pages); 8961da177e4SLinus Torvalds list_del_init(&data->pages); 8971da177e4SLinus Torvalds 8981da177e4SLinus Torvalds data->pagevec[0] = page; 8991da177e4SLinus Torvalds 900bcb71bbaSTrond Myklebust if (nbytes < wsize) 901bcb71bbaSTrond Myklebust wsize = nbytes; 902dbae4c73STrond Myklebust ret2 = nfs_write_rpcsetup(req, data, &nfs_write_partial_ops, 903788e7a89STrond Myklebust wsize, offset, how); 904dbae4c73STrond Myklebust if (ret == 0) 905dbae4c73STrond Myklebust ret = ret2; 9061da177e4SLinus Torvalds offset += wsize; 9071da177e4SLinus Torvalds nbytes -= wsize; 9081da177e4SLinus Torvalds } while (nbytes != 0); 9091da177e4SLinus Torvalds 910dbae4c73STrond Myklebust return ret; 9111da177e4SLinus Torvalds 9121da177e4SLinus Torvalds out_bad: 9131da177e4SLinus Torvalds while (!list_empty(&list)) { 9141da177e4SLinus Torvalds data = list_entry(list.next, struct nfs_write_data, pages); 9151da177e4SLinus Torvalds list_del(&data->pages); 9168aca67f0STrond Myklebust nfs_writedata_release(data); 9171da177e4SLinus Torvalds } 91861822ab5STrond Myklebust nfs_redirty_request(req); 9191da177e4SLinus Torvalds return -ENOMEM; 9201da177e4SLinus Torvalds } 9211da177e4SLinus Torvalds 9221da177e4SLinus Torvalds /* 9231da177e4SLinus Torvalds * Create an RPC task for the given write request and kick it. 9241da177e4SLinus Torvalds * The page must have been locked by the caller. 9251da177e4SLinus Torvalds * 9261da177e4SLinus Torvalds * It may happen that the page we're passed is not marked dirty. 9271da177e4SLinus Torvalds * This is the case if nfs_updatepage detects a conflicting request 9281da177e4SLinus Torvalds * that has been written but not committed. 9291da177e4SLinus Torvalds */ 9308d5658c9STrond Myklebust static int nfs_flush_one(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int how) 9311da177e4SLinus Torvalds { 9321da177e4SLinus Torvalds struct nfs_page *req; 9331da177e4SLinus Torvalds struct page **pages; 9341da177e4SLinus Torvalds struct nfs_write_data *data; 9351da177e4SLinus Torvalds 9368d5658c9STrond Myklebust data = nfs_writedata_alloc(npages); 9371da177e4SLinus Torvalds if (!data) 9381da177e4SLinus Torvalds goto out_bad; 9391da177e4SLinus Torvalds 9401da177e4SLinus Torvalds pages = data->pagevec; 9411da177e4SLinus Torvalds while (!list_empty(head)) { 9421da177e4SLinus Torvalds req = nfs_list_entry(head->next); 9431da177e4SLinus Torvalds nfs_list_remove_request(req); 9441da177e4SLinus Torvalds nfs_list_add_request(req, &data->pages); 9451da177e4SLinus Torvalds ClearPageError(req->wb_page); 9461da177e4SLinus Torvalds *pages++ = req->wb_page; 9471da177e4SLinus Torvalds } 9481da177e4SLinus Torvalds req = nfs_list_entry(data->pages.next); 9491da177e4SLinus Torvalds 9501da177e4SLinus Torvalds /* Set up the argument struct */ 951dbae4c73STrond Myklebust return nfs_write_rpcsetup(req, data, &nfs_write_full_ops, count, 0, how); 9521da177e4SLinus Torvalds out_bad: 9531da177e4SLinus Torvalds while (!list_empty(head)) { 95410afec90STrond Myklebust req = nfs_list_entry(head->next); 9551da177e4SLinus Torvalds nfs_list_remove_request(req); 95661822ab5STrond Myklebust nfs_redirty_request(req); 9571da177e4SLinus Torvalds } 9581da177e4SLinus Torvalds return -ENOMEM; 9591da177e4SLinus Torvalds } 9601da177e4SLinus Torvalds 961c63c7b05STrond Myklebust static void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, 962c63c7b05STrond Myklebust struct inode *inode, int ioflags) 9631da177e4SLinus Torvalds { 964bf4285e7SChuck Lever size_t wsize = NFS_SERVER(inode)->wsize; 9651da177e4SLinus Torvalds 966bcb71bbaSTrond Myklebust if (wsize < PAGE_CACHE_SIZE) 967c63c7b05STrond Myklebust nfs_pageio_init(pgio, inode, nfs_flush_multi, wsize, ioflags); 968bcb71bbaSTrond Myklebust else 969c63c7b05STrond Myklebust nfs_pageio_init(pgio, inode, nfs_flush_one, wsize, ioflags); 9701da177e4SLinus Torvalds } 9711da177e4SLinus Torvalds 9721da177e4SLinus Torvalds /* 9731da177e4SLinus Torvalds * Handle a write reply that flushed part of a page. 9741da177e4SLinus Torvalds */ 975788e7a89STrond Myklebust static void nfs_writeback_done_partial(struct rpc_task *task, void *calldata) 9761da177e4SLinus Torvalds { 977788e7a89STrond Myklebust struct nfs_write_data *data = calldata; 9781da177e4SLinus Torvalds struct nfs_page *req = data->req; 9791da177e4SLinus Torvalds 9801da177e4SLinus Torvalds dprintk("NFS: write (%s/%Ld %d@%Ld)", 98188be9f99STrond Myklebust req->wb_context->path.dentry->d_inode->i_sb->s_id, 98288be9f99STrond Myklebust (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), 9831da177e4SLinus Torvalds req->wb_bytes, 9841da177e4SLinus Torvalds (long long)req_offset(req)); 9851da177e4SLinus Torvalds 986c9d8f89dSTrond Myklebust nfs_writeback_done(task, data); 987c9d8f89dSTrond Myklebust } 988788e7a89STrond Myklebust 989c9d8f89dSTrond Myklebust static void nfs_writeback_release_partial(void *calldata) 990c9d8f89dSTrond Myklebust { 991c9d8f89dSTrond Myklebust struct nfs_write_data *data = calldata; 992c9d8f89dSTrond Myklebust struct nfs_page *req = data->req; 993c9d8f89dSTrond Myklebust struct page *page = req->wb_page; 994c9d8f89dSTrond Myklebust int status = data->task.tk_status; 995c9d8f89dSTrond Myklebust 996c9d8f89dSTrond Myklebust if (status < 0) { 997a301b777STrond Myklebust nfs_set_pageerror(page); 998c9d8f89dSTrond Myklebust nfs_context_set_write_error(req->wb_context, status); 999c9d8f89dSTrond Myklebust dprintk(", error = %d\n", status); 10008e821cadSTrond Myklebust goto out; 10018e821cadSTrond Myklebust } 10028e821cadSTrond Myklebust 10038e821cadSTrond Myklebust if (nfs_write_need_commit(data)) { 1004587142f8STrond Myklebust struct inode *inode = page->mapping->host; 10058e821cadSTrond Myklebust 1006587142f8STrond Myklebust spin_lock(&inode->i_lock); 10078e821cadSTrond Myklebust if (test_bit(PG_NEED_RESCHED, &req->wb_flags)) { 10088e821cadSTrond Myklebust /* Do nothing we need to resend the writes */ 10098e821cadSTrond Myklebust } else if (!test_and_set_bit(PG_NEED_COMMIT, &req->wb_flags)) { 10101da177e4SLinus Torvalds memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); 10111da177e4SLinus Torvalds dprintk(" defer commit\n"); 10121da177e4SLinus Torvalds } else if (memcmp(&req->wb_verf, &data->verf, sizeof(req->wb_verf))) { 10138e821cadSTrond Myklebust set_bit(PG_NEED_RESCHED, &req->wb_flags); 10148e821cadSTrond Myklebust clear_bit(PG_NEED_COMMIT, &req->wb_flags); 10151da177e4SLinus Torvalds dprintk(" server reboot detected\n"); 10161da177e4SLinus Torvalds } 1017587142f8STrond Myklebust spin_unlock(&inode->i_lock); 10181da177e4SLinus Torvalds } else 10191da177e4SLinus Torvalds dprintk(" OK\n"); 10201da177e4SLinus Torvalds 10218e821cadSTrond Myklebust out: 10221da177e4SLinus Torvalds if (atomic_dec_and_test(&req->wb_complete)) 10231da177e4SLinus Torvalds nfs_writepage_release(req); 1024c9d8f89dSTrond Myklebust nfs_writedata_release(calldata); 10251da177e4SLinus Torvalds } 10261da177e4SLinus Torvalds 1027788e7a89STrond Myklebust static const struct rpc_call_ops nfs_write_partial_ops = { 1028788e7a89STrond Myklebust .rpc_call_done = nfs_writeback_done_partial, 1029c9d8f89dSTrond Myklebust .rpc_release = nfs_writeback_release_partial, 1030788e7a89STrond Myklebust }; 1031788e7a89STrond Myklebust 10321da177e4SLinus Torvalds /* 10331da177e4SLinus Torvalds * Handle a write reply that flushes a whole page. 10341da177e4SLinus Torvalds * 10351da177e4SLinus Torvalds * FIXME: There is an inherent race with invalidate_inode_pages and 10361da177e4SLinus Torvalds * writebacks since the page->count is kept > 1 for as long 10371da177e4SLinus Torvalds * as the page has a write request pending. 10381da177e4SLinus Torvalds */ 1039788e7a89STrond Myklebust static void nfs_writeback_done_full(struct rpc_task *task, void *calldata) 10401da177e4SLinus Torvalds { 1041788e7a89STrond Myklebust struct nfs_write_data *data = calldata; 10421da177e4SLinus Torvalds 1043c9d8f89dSTrond Myklebust nfs_writeback_done(task, data); 1044c9d8f89dSTrond Myklebust } 1045c9d8f89dSTrond Myklebust 1046c9d8f89dSTrond Myklebust static void nfs_writeback_release_full(void *calldata) 1047c9d8f89dSTrond Myklebust { 1048c9d8f89dSTrond Myklebust struct nfs_write_data *data = calldata; 1049c9d8f89dSTrond Myklebust int status = data->task.tk_status; 1050788e7a89STrond Myklebust 10511da177e4SLinus Torvalds /* Update attributes as result of writeback. */ 10521da177e4SLinus Torvalds while (!list_empty(&data->pages)) { 1053c9d8f89dSTrond Myklebust struct nfs_page *req = nfs_list_entry(data->pages.next); 1054c9d8f89dSTrond Myklebust struct page *page = req->wb_page; 1055c9d8f89dSTrond Myklebust 10561da177e4SLinus Torvalds nfs_list_remove_request(req); 10571da177e4SLinus Torvalds 10581da177e4SLinus Torvalds dprintk("NFS: write (%s/%Ld %d@%Ld)", 105988be9f99STrond Myklebust req->wb_context->path.dentry->d_inode->i_sb->s_id, 106088be9f99STrond Myklebust (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), 10611da177e4SLinus Torvalds req->wb_bytes, 10621da177e4SLinus Torvalds (long long)req_offset(req)); 10631da177e4SLinus Torvalds 1064c9d8f89dSTrond Myklebust if (status < 0) { 1065a301b777STrond Myklebust nfs_set_pageerror(page); 1066c9d8f89dSTrond Myklebust nfs_context_set_write_error(req->wb_context, status); 1067c9d8f89dSTrond Myklebust dprintk(", error = %d\n", status); 10688e821cadSTrond Myklebust goto remove_request; 10691da177e4SLinus Torvalds } 10701da177e4SLinus Torvalds 10718e821cadSTrond Myklebust if (nfs_write_need_commit(data)) { 10721da177e4SLinus Torvalds memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); 10731da177e4SLinus Torvalds nfs_mark_request_commit(req); 10748e821cadSTrond Myklebust nfs_end_page_writeback(page); 10751da177e4SLinus Torvalds dprintk(" marked for commit\n"); 10768e821cadSTrond Myklebust goto next; 10778e821cadSTrond Myklebust } 107844dd151dSTrond Myklebust /* Set the PG_uptodate flag? */ 107944dd151dSTrond Myklebust nfs_mark_uptodate(page, req->wb_pgbase, req->wb_bytes); 10808e821cadSTrond Myklebust dprintk(" OK\n"); 10818e821cadSTrond Myklebust remove_request: 10828e821cadSTrond Myklebust nfs_end_page_writeback(page); 10831da177e4SLinus Torvalds nfs_inode_remove_request(req); 10841da177e4SLinus Torvalds next: 10859fd367f0STrond Myklebust nfs_clear_page_tag_locked(req); 10861da177e4SLinus Torvalds } 1087c9d8f89dSTrond Myklebust nfs_writedata_release(calldata); 10881da177e4SLinus Torvalds } 10891da177e4SLinus Torvalds 1090788e7a89STrond Myklebust static const struct rpc_call_ops nfs_write_full_ops = { 1091788e7a89STrond Myklebust .rpc_call_done = nfs_writeback_done_full, 1092c9d8f89dSTrond Myklebust .rpc_release = nfs_writeback_release_full, 1093788e7a89STrond Myklebust }; 1094788e7a89STrond Myklebust 1095788e7a89STrond Myklebust 10961da177e4SLinus Torvalds /* 10971da177e4SLinus Torvalds * This function is called when the WRITE call is complete. 10981da177e4SLinus Torvalds */ 1099462d5b32SChuck Lever int nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data) 11001da177e4SLinus Torvalds { 11011da177e4SLinus Torvalds struct nfs_writeargs *argp = &data->args; 11021da177e4SLinus Torvalds struct nfs_writeres *resp = &data->res; 1103788e7a89STrond Myklebust int status; 11041da177e4SLinus Torvalds 1105a3f565b1SChuck Lever dprintk("NFS: %5u nfs_writeback_done (status %d)\n", 11061da177e4SLinus Torvalds task->tk_pid, task->tk_status); 11071da177e4SLinus Torvalds 1108f551e44fSChuck Lever /* 1109f551e44fSChuck Lever * ->write_done will attempt to use post-op attributes to detect 1110f551e44fSChuck Lever * conflicting writes by other clients. A strict interpretation 1111f551e44fSChuck Lever * of close-to-open would allow us to continue caching even if 1112f551e44fSChuck Lever * another writer had changed the file, but some applications 1113f551e44fSChuck Lever * depend on tighter cache coherency when writing. 1114f551e44fSChuck Lever */ 1115788e7a89STrond Myklebust status = NFS_PROTO(data->inode)->write_done(task, data); 1116788e7a89STrond Myklebust if (status != 0) 1117788e7a89STrond Myklebust return status; 111891d5b470SChuck Lever nfs_add_stats(data->inode, NFSIOS_SERVERWRITTENBYTES, resp->count); 111991d5b470SChuck Lever 11201da177e4SLinus Torvalds #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) 11211da177e4SLinus Torvalds if (resp->verf->committed < argp->stable && task->tk_status >= 0) { 11221da177e4SLinus Torvalds /* We tried a write call, but the server did not 11231da177e4SLinus Torvalds * commit data to stable storage even though we 11241da177e4SLinus Torvalds * requested it. 11251da177e4SLinus Torvalds * Note: There is a known bug in Tru64 < 5.0 in which 11261da177e4SLinus Torvalds * the server reports NFS_DATA_SYNC, but performs 11271da177e4SLinus Torvalds * NFS_FILE_SYNC. We therefore implement this checking 11281da177e4SLinus Torvalds * as a dprintk() in order to avoid filling syslog. 11291da177e4SLinus Torvalds */ 11301da177e4SLinus Torvalds static unsigned long complain; 11311da177e4SLinus Torvalds 11321da177e4SLinus Torvalds if (time_before(complain, jiffies)) { 11331da177e4SLinus Torvalds dprintk("NFS: faulty NFS server %s:" 11341da177e4SLinus Torvalds " (committed = %d) != (stable = %d)\n", 113554ceac45SDavid Howells NFS_SERVER(data->inode)->nfs_client->cl_hostname, 11361da177e4SLinus Torvalds resp->verf->committed, argp->stable); 11371da177e4SLinus Torvalds complain = jiffies + 300 * HZ; 11381da177e4SLinus Torvalds } 11391da177e4SLinus Torvalds } 11401da177e4SLinus Torvalds #endif 11411da177e4SLinus Torvalds /* Is this a short write? */ 11421da177e4SLinus Torvalds if (task->tk_status >= 0 && resp->count < argp->count) { 11431da177e4SLinus Torvalds static unsigned long complain; 11441da177e4SLinus Torvalds 114591d5b470SChuck Lever nfs_inc_stats(data->inode, NFSIOS_SHORTWRITE); 114691d5b470SChuck Lever 11471da177e4SLinus Torvalds /* Has the server at least made some progress? */ 11481da177e4SLinus Torvalds if (resp->count != 0) { 11491da177e4SLinus Torvalds /* Was this an NFSv2 write or an NFSv3 stable write? */ 11501da177e4SLinus Torvalds if (resp->verf->committed != NFS_UNSTABLE) { 11511da177e4SLinus Torvalds /* Resend from where the server left off */ 11521da177e4SLinus Torvalds argp->offset += resp->count; 11531da177e4SLinus Torvalds argp->pgbase += resp->count; 11541da177e4SLinus Torvalds argp->count -= resp->count; 11551da177e4SLinus Torvalds } else { 11561da177e4SLinus Torvalds /* Resend as a stable write in order to avoid 11571da177e4SLinus Torvalds * headaches in the case of a server crash. 11581da177e4SLinus Torvalds */ 11591da177e4SLinus Torvalds argp->stable = NFS_FILE_SYNC; 11601da177e4SLinus Torvalds } 11611da177e4SLinus Torvalds rpc_restart_call(task); 1162788e7a89STrond Myklebust return -EAGAIN; 11631da177e4SLinus Torvalds } 11641da177e4SLinus Torvalds if (time_before(complain, jiffies)) { 11651da177e4SLinus Torvalds printk(KERN_WARNING 11661da177e4SLinus Torvalds "NFS: Server wrote zero bytes, expected %u.\n", 11671da177e4SLinus Torvalds argp->count); 11681da177e4SLinus Torvalds complain = jiffies + 300 * HZ; 11691da177e4SLinus Torvalds } 11701da177e4SLinus Torvalds /* Can't do anything about it except throw an error. */ 11711da177e4SLinus Torvalds task->tk_status = -EIO; 11721da177e4SLinus Torvalds } 1173788e7a89STrond Myklebust return 0; 11741da177e4SLinus Torvalds } 11751da177e4SLinus Torvalds 11761da177e4SLinus Torvalds 11771da177e4SLinus Torvalds #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) 1178c9d8f89dSTrond Myklebust void nfs_commitdata_release(void *data) 11791da177e4SLinus Torvalds { 1180383ba719STrond Myklebust struct nfs_write_data *wdata = data; 1181383ba719STrond Myklebust 1182383ba719STrond Myklebust put_nfs_open_context(wdata->args.context); 11831da177e4SLinus Torvalds nfs_commit_free(wdata); 11841da177e4SLinus Torvalds } 11851da177e4SLinus Torvalds 11861da177e4SLinus Torvalds /* 11871da177e4SLinus Torvalds * Set up the argument/result storage required for the RPC call. 11881da177e4SLinus Torvalds */ 1189dbae4c73STrond Myklebust static int nfs_commit_rpcsetup(struct list_head *head, 1190788e7a89STrond Myklebust struct nfs_write_data *data, 1191788e7a89STrond Myklebust int how) 11921da177e4SLinus Torvalds { 119384115e1cSTrond Myklebust struct nfs_page *first = nfs_list_entry(head->next); 119484115e1cSTrond Myklebust struct inode *inode = first->wb_context->path.dentry->d_inode; 119584115e1cSTrond Myklebust int flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; 11963ff7576dSTrond Myklebust int priority = flush_task_priority(how); 119707737691STrond Myklebust struct rpc_task *task; 1198bdc7f021STrond Myklebust struct rpc_message msg = { 1199bdc7f021STrond Myklebust .rpc_argp = &data->args, 1200bdc7f021STrond Myklebust .rpc_resp = &data->res, 1201bdc7f021STrond Myklebust .rpc_cred = first->wb_context->cred, 1202bdc7f021STrond Myklebust }; 120384115e1cSTrond Myklebust struct rpc_task_setup task_setup_data = { 120407737691STrond Myklebust .task = &data->task, 120584115e1cSTrond Myklebust .rpc_client = NFS_CLIENT(inode), 1206bdc7f021STrond Myklebust .rpc_message = &msg, 120784115e1cSTrond Myklebust .callback_ops = &nfs_commit_ops, 120884115e1cSTrond Myklebust .callback_data = data, 1209101070caSTrond Myklebust .workqueue = nfsiod_workqueue, 121084115e1cSTrond Myklebust .flags = flags, 12113ff7576dSTrond Myklebust .priority = priority, 121284115e1cSTrond Myklebust }; 12131da177e4SLinus Torvalds 12141da177e4SLinus Torvalds /* Set up the RPC argument and reply structs 12151da177e4SLinus Torvalds * NB: take care not to mess about with data->commit et al. */ 12161da177e4SLinus Torvalds 12171da177e4SLinus Torvalds list_splice_init(head, &data->pages); 12181da177e4SLinus Torvalds 12191da177e4SLinus Torvalds data->inode = inode; 1220bdc7f021STrond Myklebust data->cred = msg.rpc_cred; 12211da177e4SLinus Torvalds 12221da177e4SLinus Torvalds data->args.fh = NFS_FH(data->inode); 12233da28eb1STrond Myklebust /* Note: we always request a commit of the entire inode */ 12243da28eb1STrond Myklebust data->args.offset = 0; 12253da28eb1STrond Myklebust data->args.count = 0; 1226383ba719STrond Myklebust data->args.context = get_nfs_open_context(first->wb_context); 12273da28eb1STrond Myklebust data->res.count = 0; 12281da177e4SLinus Torvalds data->res.fattr = &data->fattr; 12291da177e4SLinus Torvalds data->res.verf = &data->verf; 12300e574af1STrond Myklebust nfs_fattr_init(&data->fattr); 12311da177e4SLinus Torvalds 1232788e7a89STrond Myklebust /* Set up the initial task struct. */ 1233bdc7f021STrond Myklebust NFS_PROTO(inode)->commit_setup(data, &msg); 12341da177e4SLinus Torvalds 1235a3f565b1SChuck Lever dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid); 1236bdc7f021STrond Myklebust 123707737691STrond Myklebust task = rpc_run_task(&task_setup_data); 1238dbae4c73STrond Myklebust if (IS_ERR(task)) 1239dbae4c73STrond Myklebust return PTR_ERR(task); 124007737691STrond Myklebust rpc_put_task(task); 1241dbae4c73STrond Myklebust return 0; 12421da177e4SLinus Torvalds } 12431da177e4SLinus Torvalds 12441da177e4SLinus Torvalds /* 12451da177e4SLinus Torvalds * Commit dirty pages 12461da177e4SLinus Torvalds */ 12471da177e4SLinus Torvalds static int 124840859d7eSChuck Lever nfs_commit_list(struct inode *inode, struct list_head *head, int how) 12491da177e4SLinus Torvalds { 12501da177e4SLinus Torvalds struct nfs_write_data *data; 12511da177e4SLinus Torvalds struct nfs_page *req; 12521da177e4SLinus Torvalds 1253c9d8f89dSTrond Myklebust data = nfs_commitdata_alloc(); 12541da177e4SLinus Torvalds 12551da177e4SLinus Torvalds if (!data) 12561da177e4SLinus Torvalds goto out_bad; 12571da177e4SLinus Torvalds 12581da177e4SLinus Torvalds /* Set up the argument struct */ 1259dbae4c73STrond Myklebust return nfs_commit_rpcsetup(head, data, how); 12601da177e4SLinus Torvalds out_bad: 12611da177e4SLinus Torvalds while (!list_empty(head)) { 12621da177e4SLinus Torvalds req = nfs_list_entry(head->next); 12631da177e4SLinus Torvalds nfs_list_remove_request(req); 12641da177e4SLinus Torvalds nfs_mark_request_commit(req); 126583715ad5STrond Myklebust dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); 1266c9e51e41SPeter Zijlstra dec_bdi_stat(req->wb_page->mapping->backing_dev_info, 1267c9e51e41SPeter Zijlstra BDI_RECLAIMABLE); 12689fd367f0STrond Myklebust nfs_clear_page_tag_locked(req); 12691da177e4SLinus Torvalds } 12701da177e4SLinus Torvalds return -ENOMEM; 12711da177e4SLinus Torvalds } 12721da177e4SLinus Torvalds 12731da177e4SLinus Torvalds /* 12741da177e4SLinus Torvalds * COMMIT call returned 12751da177e4SLinus Torvalds */ 1276788e7a89STrond Myklebust static void nfs_commit_done(struct rpc_task *task, void *calldata) 12771da177e4SLinus Torvalds { 1278963d8fe5STrond Myklebust struct nfs_write_data *data = calldata; 12791da177e4SLinus Torvalds 1280a3f565b1SChuck Lever dprintk("NFS: %5u nfs_commit_done (status %d)\n", 12811da177e4SLinus Torvalds task->tk_pid, task->tk_status); 12821da177e4SLinus Torvalds 1283788e7a89STrond Myklebust /* Call the NFS version-specific code */ 1284788e7a89STrond Myklebust if (NFS_PROTO(data->inode)->commit_done(task, data) != 0) 1285788e7a89STrond Myklebust return; 1286c9d8f89dSTrond Myklebust } 1287c9d8f89dSTrond Myklebust 1288c9d8f89dSTrond Myklebust static void nfs_commit_release(void *calldata) 1289c9d8f89dSTrond Myklebust { 1290c9d8f89dSTrond Myklebust struct nfs_write_data *data = calldata; 1291c9d8f89dSTrond Myklebust struct nfs_page *req; 1292c9d8f89dSTrond Myklebust int status = data->task.tk_status; 1293788e7a89STrond Myklebust 12941da177e4SLinus Torvalds while (!list_empty(&data->pages)) { 12951da177e4SLinus Torvalds req = nfs_list_entry(data->pages.next); 12961da177e4SLinus Torvalds nfs_list_remove_request(req); 1297612c9384STrond Myklebust clear_bit(PG_NEED_COMMIT, &(req)->wb_flags); 1298fd39fc85SChristoph Lameter dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); 1299c9e51e41SPeter Zijlstra dec_bdi_stat(req->wb_page->mapping->backing_dev_info, 1300c9e51e41SPeter Zijlstra BDI_RECLAIMABLE); 13011da177e4SLinus Torvalds 13021da177e4SLinus Torvalds dprintk("NFS: commit (%s/%Ld %d@%Ld)", 130388be9f99STrond Myklebust req->wb_context->path.dentry->d_inode->i_sb->s_id, 130488be9f99STrond Myklebust (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), 13051da177e4SLinus Torvalds req->wb_bytes, 13061da177e4SLinus Torvalds (long long)req_offset(req)); 1307c9d8f89dSTrond Myklebust if (status < 0) { 1308c9d8f89dSTrond Myklebust nfs_context_set_write_error(req->wb_context, status); 13091da177e4SLinus Torvalds nfs_inode_remove_request(req); 1310c9d8f89dSTrond Myklebust dprintk(", error = %d\n", status); 13111da177e4SLinus Torvalds goto next; 13121da177e4SLinus Torvalds } 13131da177e4SLinus Torvalds 13141da177e4SLinus Torvalds /* Okay, COMMIT succeeded, apparently. Check the verifier 13151da177e4SLinus Torvalds * returned by the server against all stored verfs. */ 13161da177e4SLinus Torvalds if (!memcmp(req->wb_verf.verifier, data->verf.verifier, sizeof(data->verf.verifier))) { 13171da177e4SLinus Torvalds /* We have a match */ 131844dd151dSTrond Myklebust /* Set the PG_uptodate flag */ 131944dd151dSTrond Myklebust nfs_mark_uptodate(req->wb_page, req->wb_pgbase, 132044dd151dSTrond Myklebust req->wb_bytes); 13211da177e4SLinus Torvalds nfs_inode_remove_request(req); 13221da177e4SLinus Torvalds dprintk(" OK\n"); 13231da177e4SLinus Torvalds goto next; 13241da177e4SLinus Torvalds } 13251da177e4SLinus Torvalds /* We have a mismatch. Write the page again */ 13261da177e4SLinus Torvalds dprintk(" mismatch\n"); 13276d884e8fSFred nfs_mark_request_dirty(req); 13281da177e4SLinus Torvalds next: 13299fd367f0STrond Myklebust nfs_clear_page_tag_locked(req); 13301da177e4SLinus Torvalds } 1331c9d8f89dSTrond Myklebust nfs_commitdata_release(calldata); 13321da177e4SLinus Torvalds } 1333788e7a89STrond Myklebust 1334788e7a89STrond Myklebust static const struct rpc_call_ops nfs_commit_ops = { 1335788e7a89STrond Myklebust .rpc_call_done = nfs_commit_done, 1336788e7a89STrond Myklebust .rpc_release = nfs_commit_release, 1337788e7a89STrond Myklebust }; 13381da177e4SLinus Torvalds 13393da28eb1STrond Myklebust int nfs_commit_inode(struct inode *inode, int how) 13401da177e4SLinus Torvalds { 13411da177e4SLinus Torvalds LIST_HEAD(head); 13427d46a49fSTrond Myklebust int res; 13431da177e4SLinus Torvalds 1344587142f8STrond Myklebust spin_lock(&inode->i_lock); 13453da28eb1STrond Myklebust res = nfs_scan_commit(inode, &head, 0, 0); 1346587142f8STrond Myklebust spin_unlock(&inode->i_lock); 13471da177e4SLinus Torvalds if (res) { 13487d46a49fSTrond Myklebust int error = nfs_commit_list(inode, &head, how); 13491da177e4SLinus Torvalds if (error < 0) 13501da177e4SLinus Torvalds return error; 13513da28eb1STrond Myklebust } 13521da177e4SLinus Torvalds return res; 13531da177e4SLinus Torvalds } 1354c63c7b05STrond Myklebust #else 1355c63c7b05STrond Myklebust static inline int nfs_commit_list(struct inode *inode, struct list_head *head, int how) 1356c63c7b05STrond Myklebust { 1357c63c7b05STrond Myklebust return 0; 1358c63c7b05STrond Myklebust } 13591da177e4SLinus Torvalds #endif 13601da177e4SLinus Torvalds 13611c75950bSTrond Myklebust long nfs_sync_mapping_wait(struct address_space *mapping, struct writeback_control *wbc, int how) 13621da177e4SLinus Torvalds { 13631c75950bSTrond Myklebust struct inode *inode = mapping->host; 1364ca52fec1STrond Myklebust pgoff_t idx_start, idx_end; 13651c75950bSTrond Myklebust unsigned int npages = 0; 1366c42de9ddSTrond Myklebust LIST_HEAD(head); 136770b9ecbdSTrond Myklebust int nocommit = how & FLUSH_NOCOMMIT; 13683f442547STrond Myklebust long pages, ret; 13691da177e4SLinus Torvalds 13701c75950bSTrond Myklebust /* FIXME */ 13711c75950bSTrond Myklebust if (wbc->range_cyclic) 13721c75950bSTrond Myklebust idx_start = 0; 13731c75950bSTrond Myklebust else { 13741c75950bSTrond Myklebust idx_start = wbc->range_start >> PAGE_CACHE_SHIFT; 13751c75950bSTrond Myklebust idx_end = wbc->range_end >> PAGE_CACHE_SHIFT; 13761c75950bSTrond Myklebust if (idx_end > idx_start) { 1377ca52fec1STrond Myklebust pgoff_t l_npages = 1 + idx_end - idx_start; 13781c75950bSTrond Myklebust npages = l_npages; 13791c75950bSTrond Myklebust if (sizeof(npages) != sizeof(l_npages) && 1380ca52fec1STrond Myklebust (pgoff_t)npages != l_npages) 13811c75950bSTrond Myklebust npages = 0; 13821c75950bSTrond Myklebust } 13831c75950bSTrond Myklebust } 1384c42de9ddSTrond Myklebust how &= ~FLUSH_NOCOMMIT; 1385587142f8STrond Myklebust spin_lock(&inode->i_lock); 13861da177e4SLinus Torvalds do { 1387c42de9ddSTrond Myklebust ret = nfs_wait_on_requests_locked(inode, idx_start, npages); 1388c42de9ddSTrond Myklebust if (ret != 0) 1389c42de9ddSTrond Myklebust continue; 1390c42de9ddSTrond Myklebust if (nocommit) 1391c42de9ddSTrond Myklebust break; 1392d2ccddf0STrond Myklebust pages = nfs_scan_commit(inode, &head, idx_start, npages); 1393724c439cSTrond Myklebust if (pages == 0) 1394c42de9ddSTrond Myklebust break; 1395d2ccddf0STrond Myklebust if (how & FLUSH_INVALIDATE) { 1396587142f8STrond Myklebust spin_unlock(&inode->i_lock); 139783715ad5STrond Myklebust nfs_cancel_commit_list(&head); 1398e8e058e8STrond Myklebust ret = pages; 1399587142f8STrond Myklebust spin_lock(&inode->i_lock); 1400d2ccddf0STrond Myklebust continue; 1401d2ccddf0STrond Myklebust } 1402d2ccddf0STrond Myklebust pages += nfs_scan_commit(inode, &head, 0, 0); 1403587142f8STrond Myklebust spin_unlock(&inode->i_lock); 1404c42de9ddSTrond Myklebust ret = nfs_commit_list(inode, &head, how); 1405587142f8STrond Myklebust spin_lock(&inode->i_lock); 1406587142f8STrond Myklebust 1407c42de9ddSTrond Myklebust } while (ret >= 0); 1408587142f8STrond Myklebust spin_unlock(&inode->i_lock); 1409c42de9ddSTrond Myklebust return ret; 14101da177e4SLinus Torvalds } 14111da177e4SLinus Torvalds 141234901f70STrond Myklebust static int __nfs_write_mapping(struct address_space *mapping, struct writeback_control *wbc, int how) 14131c75950bSTrond Myklebust { 14141c75950bSTrond Myklebust int ret; 14151c75950bSTrond Myklebust 141634901f70STrond Myklebust ret = nfs_writepages(mapping, wbc); 141761822ab5STrond Myklebust if (ret < 0) 141861822ab5STrond Myklebust goto out; 141934901f70STrond Myklebust ret = nfs_sync_mapping_wait(mapping, wbc, how); 1420ed90ef51STrond Myklebust if (ret < 0) 1421ed90ef51STrond Myklebust goto out; 14221c75950bSTrond Myklebust return 0; 142361822ab5STrond Myklebust out: 1424e507d9ebSTrond Myklebust __mark_inode_dirty(mapping->host, I_DIRTY_PAGES); 14251c75950bSTrond Myklebust return ret; 14261c75950bSTrond Myklebust } 14271c75950bSTrond Myklebust 142834901f70STrond Myklebust /* Two pass sync: first using WB_SYNC_NONE, then WB_SYNC_ALL */ 142934901f70STrond Myklebust static int nfs_write_mapping(struct address_space *mapping, int how) 143034901f70STrond Myklebust { 143134901f70STrond Myklebust struct writeback_control wbc = { 143234901f70STrond Myklebust .bdi = mapping->backing_dev_info, 143334901f70STrond Myklebust .sync_mode = WB_SYNC_NONE, 143434901f70STrond Myklebust .nr_to_write = LONG_MAX, 143534901f70STrond Myklebust .for_writepages = 1, 143634901f70STrond Myklebust .range_cyclic = 1, 143734901f70STrond Myklebust }; 143834901f70STrond Myklebust int ret; 143934901f70STrond Myklebust 144034901f70STrond Myklebust ret = __nfs_write_mapping(mapping, &wbc, how); 144134901f70STrond Myklebust if (ret < 0) 144234901f70STrond Myklebust return ret; 144334901f70STrond Myklebust wbc.sync_mode = WB_SYNC_ALL; 144434901f70STrond Myklebust return __nfs_write_mapping(mapping, &wbc, how); 144534901f70STrond Myklebust } 144634901f70STrond Myklebust 1447ed90ef51STrond Myklebust /* 1448ed90ef51STrond Myklebust * flush the inode to disk. 1449ed90ef51STrond Myklebust */ 1450ed90ef51STrond Myklebust int nfs_wb_all(struct inode *inode) 14511c75950bSTrond Myklebust { 1452ed90ef51STrond Myklebust return nfs_write_mapping(inode->i_mapping, 0); 1453ed90ef51STrond Myklebust } 14541c75950bSTrond Myklebust 1455ed90ef51STrond Myklebust int nfs_wb_nocommit(struct inode *inode) 1456ed90ef51STrond Myklebust { 1457ed90ef51STrond Myklebust return nfs_write_mapping(inode->i_mapping, FLUSH_NOCOMMIT); 14581c75950bSTrond Myklebust } 14591c75950bSTrond Myklebust 14601b3b4a1aSTrond Myklebust int nfs_wb_page_cancel(struct inode *inode, struct page *page) 14611b3b4a1aSTrond Myklebust { 14621b3b4a1aSTrond Myklebust struct nfs_page *req; 14631b3b4a1aSTrond Myklebust loff_t range_start = page_offset(page); 14641b3b4a1aSTrond Myklebust loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); 14651b3b4a1aSTrond Myklebust struct writeback_control wbc = { 14661b3b4a1aSTrond Myklebust .bdi = page->mapping->backing_dev_info, 14671b3b4a1aSTrond Myklebust .sync_mode = WB_SYNC_ALL, 14681b3b4a1aSTrond Myklebust .nr_to_write = LONG_MAX, 14691b3b4a1aSTrond Myklebust .range_start = range_start, 14701b3b4a1aSTrond Myklebust .range_end = range_end, 14711b3b4a1aSTrond Myklebust }; 14721b3b4a1aSTrond Myklebust int ret = 0; 14731b3b4a1aSTrond Myklebust 14741b3b4a1aSTrond Myklebust BUG_ON(!PageLocked(page)); 14751b3b4a1aSTrond Myklebust for (;;) { 14761b3b4a1aSTrond Myklebust req = nfs_page_find_request(page); 14771b3b4a1aSTrond Myklebust if (req == NULL) 14781b3b4a1aSTrond Myklebust goto out; 14791b3b4a1aSTrond Myklebust if (test_bit(PG_NEED_COMMIT, &req->wb_flags)) { 14801b3b4a1aSTrond Myklebust nfs_release_request(req); 14811b3b4a1aSTrond Myklebust break; 14821b3b4a1aSTrond Myklebust } 14831b3b4a1aSTrond Myklebust if (nfs_lock_request_dontget(req)) { 14841b3b4a1aSTrond Myklebust nfs_inode_remove_request(req); 14851b3b4a1aSTrond Myklebust /* 14861b3b4a1aSTrond Myklebust * In case nfs_inode_remove_request has marked the 14871b3b4a1aSTrond Myklebust * page as being dirty 14881b3b4a1aSTrond Myklebust */ 14891b3b4a1aSTrond Myklebust cancel_dirty_page(page, PAGE_CACHE_SIZE); 14901b3b4a1aSTrond Myklebust nfs_unlock_request(req); 14911b3b4a1aSTrond Myklebust break; 14921b3b4a1aSTrond Myklebust } 14931b3b4a1aSTrond Myklebust ret = nfs_wait_on_request(req); 14941b3b4a1aSTrond Myklebust if (ret < 0) 14951b3b4a1aSTrond Myklebust goto out; 14961b3b4a1aSTrond Myklebust } 14971b3b4a1aSTrond Myklebust if (!PagePrivate(page)) 14981b3b4a1aSTrond Myklebust return 0; 14991b3b4a1aSTrond Myklebust ret = nfs_sync_mapping_wait(page->mapping, &wbc, FLUSH_INVALIDATE); 15001b3b4a1aSTrond Myklebust out: 15011b3b4a1aSTrond Myklebust return ret; 15021b3b4a1aSTrond Myklebust } 15031b3b4a1aSTrond Myklebust 15045334eb13SAdrian Bunk static int nfs_wb_page_priority(struct inode *inode, struct page *page, 15055334eb13SAdrian Bunk int how) 15061c75950bSTrond Myklebust { 15071c75950bSTrond Myklebust loff_t range_start = page_offset(page); 15081c75950bSTrond Myklebust loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); 15094d770ccfSTrond Myklebust struct writeback_control wbc = { 15104d770ccfSTrond Myklebust .bdi = page->mapping->backing_dev_info, 15114d770ccfSTrond Myklebust .sync_mode = WB_SYNC_ALL, 15124d770ccfSTrond Myklebust .nr_to_write = LONG_MAX, 15134d770ccfSTrond Myklebust .range_start = range_start, 15144d770ccfSTrond Myklebust .range_end = range_end, 15154d770ccfSTrond Myklebust }; 15164d770ccfSTrond Myklebust int ret; 15171c75950bSTrond Myklebust 151873e3302fSTrond Myklebust do { 1519c63c7b05STrond Myklebust if (clear_page_dirty_for_io(page)) { 15204d770ccfSTrond Myklebust ret = nfs_writepage_locked(page, &wbc); 15214d770ccfSTrond Myklebust if (ret < 0) 152273e3302fSTrond Myklebust goto out_error; 152373e3302fSTrond Myklebust } else if (!PagePrivate(page)) 152473e3302fSTrond Myklebust break; 15254d770ccfSTrond Myklebust ret = nfs_sync_mapping_wait(page->mapping, &wbc, how); 152673e3302fSTrond Myklebust if (ret < 0) 152773e3302fSTrond Myklebust goto out_error; 152873e3302fSTrond Myklebust } while (PagePrivate(page)); 15294d770ccfSTrond Myklebust return 0; 153073e3302fSTrond Myklebust out_error: 1531e507d9ebSTrond Myklebust __mark_inode_dirty(inode, I_DIRTY_PAGES); 15324d770ccfSTrond Myklebust return ret; 15331c75950bSTrond Myklebust } 15341c75950bSTrond Myklebust 15351c75950bSTrond Myklebust /* 15361c75950bSTrond Myklebust * Write back all requests on one page - we do this before reading it. 15371c75950bSTrond Myklebust */ 15381c75950bSTrond Myklebust int nfs_wb_page(struct inode *inode, struct page* page) 15391c75950bSTrond Myklebust { 15404d770ccfSTrond Myklebust return nfs_wb_page_priority(inode, page, FLUSH_STABLE); 15411c75950bSTrond Myklebust } 15421c75950bSTrond Myklebust 1543f7b422b1SDavid Howells int __init nfs_init_writepagecache(void) 15441da177e4SLinus Torvalds { 15451da177e4SLinus Torvalds nfs_wdata_cachep = kmem_cache_create("nfs_write_data", 15461da177e4SLinus Torvalds sizeof(struct nfs_write_data), 15471da177e4SLinus Torvalds 0, SLAB_HWCACHE_ALIGN, 154820c2df83SPaul Mundt NULL); 15491da177e4SLinus Torvalds if (nfs_wdata_cachep == NULL) 15501da177e4SLinus Torvalds return -ENOMEM; 15511da177e4SLinus Torvalds 155293d2341cSMatthew Dobson nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE, 15531da177e4SLinus Torvalds nfs_wdata_cachep); 15541da177e4SLinus Torvalds if (nfs_wdata_mempool == NULL) 15551da177e4SLinus Torvalds return -ENOMEM; 15561da177e4SLinus Torvalds 155793d2341cSMatthew Dobson nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT, 15581da177e4SLinus Torvalds nfs_wdata_cachep); 15591da177e4SLinus Torvalds if (nfs_commit_mempool == NULL) 15601da177e4SLinus Torvalds return -ENOMEM; 15611da177e4SLinus Torvalds 156289a09141SPeter Zijlstra /* 156389a09141SPeter Zijlstra * NFS congestion size, scale with available memory. 156489a09141SPeter Zijlstra * 156589a09141SPeter Zijlstra * 64MB: 8192k 156689a09141SPeter Zijlstra * 128MB: 11585k 156789a09141SPeter Zijlstra * 256MB: 16384k 156889a09141SPeter Zijlstra * 512MB: 23170k 156989a09141SPeter Zijlstra * 1GB: 32768k 157089a09141SPeter Zijlstra * 2GB: 46340k 157189a09141SPeter Zijlstra * 4GB: 65536k 157289a09141SPeter Zijlstra * 8GB: 92681k 157389a09141SPeter Zijlstra * 16GB: 131072k 157489a09141SPeter Zijlstra * 157589a09141SPeter Zijlstra * This allows larger machines to have larger/more transfers. 157689a09141SPeter Zijlstra * Limit the default to 256M 157789a09141SPeter Zijlstra */ 157889a09141SPeter Zijlstra nfs_congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); 157989a09141SPeter Zijlstra if (nfs_congestion_kb > 256*1024) 158089a09141SPeter Zijlstra nfs_congestion_kb = 256*1024; 158189a09141SPeter Zijlstra 15821da177e4SLinus Torvalds return 0; 15831da177e4SLinus Torvalds } 15841da177e4SLinus Torvalds 1585266bee88SDavid Brownell void nfs_destroy_writepagecache(void) 15861da177e4SLinus Torvalds { 15871da177e4SLinus Torvalds mempool_destroy(nfs_commit_mempool); 15881da177e4SLinus Torvalds mempool_destroy(nfs_wdata_mempool); 15891a1d92c1SAlexey Dobriyan kmem_cache_destroy(nfs_wdata_cachep); 15901da177e4SLinus Torvalds } 15911da177e4SLinus Torvalds 1592