11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * linux/fs/nfs/write.c 31da177e4SLinus Torvalds * 47c85d900STrond Myklebust * Write file data over NFS. 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * Copyright (C) 1996, 1997, Olaf Kirch <okir@monad.swb.de> 71da177e4SLinus Torvalds */ 81da177e4SLinus Torvalds 91da177e4SLinus Torvalds #include <linux/types.h> 101da177e4SLinus Torvalds #include <linux/slab.h> 111da177e4SLinus Torvalds #include <linux/mm.h> 121da177e4SLinus Torvalds #include <linux/pagemap.h> 131da177e4SLinus Torvalds #include <linux/file.h> 141da177e4SLinus Torvalds #include <linux/writeback.h> 1589a09141SPeter Zijlstra #include <linux/swap.h> 16074cc1deSTrond Myklebust #include <linux/migrate.h> 171da177e4SLinus Torvalds 181da177e4SLinus Torvalds #include <linux/sunrpc/clnt.h> 191da177e4SLinus Torvalds #include <linux/nfs_fs.h> 201da177e4SLinus Torvalds #include <linux/nfs_mount.h> 211da177e4SLinus Torvalds #include <linux/nfs_page.h> 223fcfab16SAndrew Morton #include <linux/backing-dev.h> 233fcfab16SAndrew Morton 241da177e4SLinus Torvalds #include <asm/uaccess.h> 251da177e4SLinus Torvalds 261da177e4SLinus Torvalds #include "delegation.h" 2749a70f27STrond Myklebust #include "internal.h" 2891d5b470SChuck Lever #include "iostat.h" 29def6ed7eSAndy Adamson #include "nfs4_fs.h" 30074cc1deSTrond Myklebust #include "fscache.h" 3194ad1c80SFred Isaman #include "pnfs.h" 321da177e4SLinus Torvalds 331da177e4SLinus Torvalds #define NFSDBG_FACILITY NFSDBG_PAGECACHE 341da177e4SLinus Torvalds 351da177e4SLinus Torvalds #define MIN_POOL_WRITE (32) 361da177e4SLinus Torvalds #define MIN_POOL_COMMIT (4) 371da177e4SLinus Torvalds 381da177e4SLinus Torvalds /* 391da177e4SLinus Torvalds * Local function declarations 401da177e4SLinus Torvalds */ 41c63c7b05STrond Myklebust static void nfs_pageio_init_write(struct nfs_pageio_descriptor *desc, 42c63c7b05STrond Myklebust struct inode *inode, int ioflags); 43f8512ad0SFred Isaman static void nfs_redirty_request(struct nfs_page *req); 44788e7a89STrond Myklebust static const struct rpc_call_ops nfs_write_partial_ops; 45788e7a89STrond Myklebust static const struct rpc_call_ops nfs_write_full_ops; 46788e7a89STrond Myklebust static const struct rpc_call_ops nfs_commit_ops; 471da177e4SLinus Torvalds 48e18b890bSChristoph Lameter static struct kmem_cache *nfs_wdata_cachep; 493feb2d49STrond Myklebust static mempool_t *nfs_wdata_mempool; 501da177e4SLinus Torvalds static mempool_t *nfs_commit_mempool; 511da177e4SLinus Torvalds 52c9d8f89dSTrond Myklebust struct nfs_write_data *nfs_commitdata_alloc(void) 531da177e4SLinus Torvalds { 54e6b4f8daSChristoph Lameter struct nfs_write_data *p = mempool_alloc(nfs_commit_mempool, GFP_NOFS); 5540859d7eSChuck Lever 561da177e4SLinus Torvalds if (p) { 571da177e4SLinus Torvalds memset(p, 0, sizeof(*p)); 581da177e4SLinus Torvalds INIT_LIST_HEAD(&p->pages); 591da177e4SLinus Torvalds } 601da177e4SLinus Torvalds return p; 611da177e4SLinus Torvalds } 621da177e4SLinus Torvalds 635e4424afSTrond Myklebust void nfs_commit_free(struct nfs_write_data *p) 641da177e4SLinus Torvalds { 6540859d7eSChuck Lever if (p && (p->pagevec != &p->page_array[0])) 6640859d7eSChuck Lever kfree(p->pagevec); 671da177e4SLinus Torvalds mempool_free(p, nfs_commit_mempool); 681da177e4SLinus Torvalds } 691da177e4SLinus Torvalds 708d5658c9STrond Myklebust struct nfs_write_data *nfs_writedata_alloc(unsigned int pagecount) 713feb2d49STrond Myklebust { 72e6b4f8daSChristoph Lameter struct nfs_write_data *p = mempool_alloc(nfs_wdata_mempool, GFP_NOFS); 733feb2d49STrond Myklebust 743feb2d49STrond Myklebust if (p) { 753feb2d49STrond Myklebust memset(p, 0, sizeof(*p)); 763feb2d49STrond Myklebust INIT_LIST_HEAD(&p->pages); 77e9f7bee1STrond Myklebust p->npages = pagecount; 780d0b5cb3SChuck Lever if (pagecount <= ARRAY_SIZE(p->page_array)) 790d0b5cb3SChuck Lever p->pagevec = p->page_array; 803feb2d49STrond Myklebust else { 810d0b5cb3SChuck Lever p->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_NOFS); 820d0b5cb3SChuck Lever if (!p->pagevec) { 833feb2d49STrond Myklebust mempool_free(p, nfs_wdata_mempool); 843feb2d49STrond Myklebust p = NULL; 853feb2d49STrond Myklebust } 863feb2d49STrond Myklebust } 873feb2d49STrond Myklebust } 883feb2d49STrond Myklebust return p; 893feb2d49STrond Myklebust } 903feb2d49STrond Myklebust 911ae88b2eSTrond Myklebust void nfs_writedata_free(struct nfs_write_data *p) 923feb2d49STrond Myklebust { 933feb2d49STrond Myklebust if (p && (p->pagevec != &p->page_array[0])) 943feb2d49STrond Myklebust kfree(p->pagevec); 953feb2d49STrond Myklebust mempool_free(p, nfs_wdata_mempool); 963feb2d49STrond Myklebust } 973feb2d49STrond Myklebust 981ae88b2eSTrond Myklebust static void nfs_writedata_release(struct nfs_write_data *wdata) 991da177e4SLinus Torvalds { 1005053aa56SFred Isaman put_lseg(wdata->lseg); 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; 139a3d01454STrond Myklebust loff_t end, i_size; 140a3d01454STrond Myklebust pgoff_t end_index; 1411da177e4SLinus Torvalds 142a3d01454STrond Myklebust spin_lock(&inode->i_lock); 143a3d01454STrond Myklebust i_size = i_size_read(inode); 144a3d01454STrond Myklebust end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; 1451da177e4SLinus Torvalds if (i_size > 0 && page->index < end_index) 146a3d01454STrond Myklebust goto out; 1471da177e4SLinus Torvalds end = ((loff_t)page->index << PAGE_CACHE_SHIFT) + ((loff_t)offset+count); 1481da177e4SLinus Torvalds if (i_size >= end) 149a3d01454STrond Myklebust goto out; 1501da177e4SLinus Torvalds i_size_write(inode, end); 151a3d01454STrond Myklebust nfs_inc_stats(inode, NFSIOS_EXTENDWRITE); 152a3d01454STrond Myklebust out: 153a3d01454STrond Myklebust spin_unlock(&inode->i_lock); 1541da177e4SLinus Torvalds } 1551da177e4SLinus Torvalds 156a301b777STrond Myklebust /* A writeback failed: mark the page as bad, and invalidate the page cache */ 157a301b777STrond Myklebust static void nfs_set_pageerror(struct page *page) 158a301b777STrond Myklebust { 159a301b777STrond Myklebust SetPageError(page); 160a301b777STrond Myklebust nfs_zap_mapping(page->mapping->host, page->mapping); 161a301b777STrond Myklebust } 162a301b777STrond Myklebust 1631da177e4SLinus Torvalds /* We can set the PG_uptodate flag if we see that a write request 1641da177e4SLinus Torvalds * covers the full page. 1651da177e4SLinus Torvalds */ 1661da177e4SLinus Torvalds static void nfs_mark_uptodate(struct page *page, unsigned int base, unsigned int count) 1671da177e4SLinus Torvalds { 1681da177e4SLinus Torvalds if (PageUptodate(page)) 1691da177e4SLinus Torvalds return; 1701da177e4SLinus Torvalds if (base != 0) 1711da177e4SLinus Torvalds return; 17249a70f27STrond Myklebust if (count != nfs_page_length(page)) 1731da177e4SLinus Torvalds return; 1741da177e4SLinus Torvalds SetPageUptodate(page); 1751da177e4SLinus Torvalds } 1761da177e4SLinus Torvalds 1771da177e4SLinus Torvalds static int wb_priority(struct writeback_control *wbc) 1781da177e4SLinus Torvalds { 1791da177e4SLinus Torvalds if (wbc->for_reclaim) 180c63c7b05STrond Myklebust return FLUSH_HIGHPRI | FLUSH_STABLE; 181b17621feSWu Fengguang if (wbc->for_kupdate || wbc->for_background) 182b31268acSTrond Myklebust return FLUSH_LOWPRI | FLUSH_COND_STABLE; 183b31268acSTrond Myklebust return FLUSH_COND_STABLE; 1841da177e4SLinus Torvalds } 1851da177e4SLinus Torvalds 1861da177e4SLinus Torvalds /* 18789a09141SPeter Zijlstra * NFS congestion control 18889a09141SPeter Zijlstra */ 18989a09141SPeter Zijlstra 19089a09141SPeter Zijlstra int nfs_congestion_kb; 19189a09141SPeter Zijlstra 19289a09141SPeter Zijlstra #define NFS_CONGESTION_ON_THRESH (nfs_congestion_kb >> (PAGE_SHIFT-10)) 19389a09141SPeter Zijlstra #define NFS_CONGESTION_OFF_THRESH \ 19489a09141SPeter Zijlstra (NFS_CONGESTION_ON_THRESH - (NFS_CONGESTION_ON_THRESH >> 2)) 19589a09141SPeter Zijlstra 1965a6d41b3STrond Myklebust static int nfs_set_page_writeback(struct page *page) 19789a09141SPeter Zijlstra { 1985a6d41b3STrond Myklebust int ret = test_set_page_writeback(page); 1995a6d41b3STrond Myklebust 2005a6d41b3STrond Myklebust if (!ret) { 20189a09141SPeter Zijlstra struct inode *inode = page->mapping->host; 20289a09141SPeter Zijlstra struct nfs_server *nfss = NFS_SERVER(inode); 20389a09141SPeter Zijlstra 204a6305ddbSTrond Myklebust page_cache_get(page); 205277866a0SPeter Zijlstra if (atomic_long_inc_return(&nfss->writeback) > 2068aa7e847SJens Axboe NFS_CONGESTION_ON_THRESH) { 2078aa7e847SJens Axboe set_bdi_congested(&nfss->backing_dev_info, 2088aa7e847SJens Axboe BLK_RW_ASYNC); 2098aa7e847SJens Axboe } 21089a09141SPeter Zijlstra } 2115a6d41b3STrond Myklebust return ret; 21289a09141SPeter Zijlstra } 21389a09141SPeter Zijlstra 21489a09141SPeter Zijlstra static void nfs_end_page_writeback(struct page *page) 21589a09141SPeter Zijlstra { 21689a09141SPeter Zijlstra struct inode *inode = page->mapping->host; 21789a09141SPeter Zijlstra struct nfs_server *nfss = NFS_SERVER(inode); 21889a09141SPeter Zijlstra 21989a09141SPeter Zijlstra end_page_writeback(page); 220a6305ddbSTrond Myklebust page_cache_release(page); 221c4dc4beeSPeter Zijlstra if (atomic_long_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH) 2228aa7e847SJens Axboe clear_bdi_congested(&nfss->backing_dev_info, BLK_RW_ASYNC); 22389a09141SPeter Zijlstra } 22489a09141SPeter Zijlstra 225cfb506e1STrond Myklebust static struct nfs_page *nfs_find_and_lock_request(struct page *page, bool nonblock) 226e261f51fSTrond Myklebust { 227587142f8STrond Myklebust struct inode *inode = page->mapping->host; 228e261f51fSTrond Myklebust struct nfs_page *req; 229e261f51fSTrond Myklebust int ret; 230e261f51fSTrond Myklebust 231587142f8STrond Myklebust spin_lock(&inode->i_lock); 232e261f51fSTrond Myklebust for (;;) { 233e261f51fSTrond Myklebust req = nfs_page_find_request_locked(page); 234074cc1deSTrond Myklebust if (req == NULL) 235074cc1deSTrond Myklebust break; 236acee478aSTrond Myklebust if (nfs_set_page_tag_locked(req)) 237e261f51fSTrond Myklebust break; 238e261f51fSTrond Myklebust /* Note: If we hold the page lock, as is the case in nfs_writepage, 239acee478aSTrond Myklebust * then the call to nfs_set_page_tag_locked() will always 240e261f51fSTrond Myklebust * succeed provided that someone hasn't already marked the 241e261f51fSTrond Myklebust * request as dirty (in which case we don't care). 242e261f51fSTrond Myklebust */ 243587142f8STrond Myklebust spin_unlock(&inode->i_lock); 244cfb506e1STrond Myklebust if (!nonblock) 245e261f51fSTrond Myklebust ret = nfs_wait_on_request(req); 246cfb506e1STrond Myklebust else 247cfb506e1STrond Myklebust ret = -EAGAIN; 248e261f51fSTrond Myklebust nfs_release_request(req); 249e261f51fSTrond Myklebust if (ret != 0) 250074cc1deSTrond Myklebust return ERR_PTR(ret); 251587142f8STrond Myklebust spin_lock(&inode->i_lock); 252e261f51fSTrond Myklebust } 253587142f8STrond Myklebust spin_unlock(&inode->i_lock); 254074cc1deSTrond Myklebust return req; 255612c9384STrond Myklebust } 256074cc1deSTrond Myklebust 257074cc1deSTrond Myklebust /* 258074cc1deSTrond Myklebust * Find an associated nfs write request, and prepare to flush it out 259074cc1deSTrond Myklebust * May return an error if the user signalled nfs_wait_on_request(). 260074cc1deSTrond Myklebust */ 261074cc1deSTrond Myklebust static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio, 262cfb506e1STrond Myklebust struct page *page, bool nonblock) 263074cc1deSTrond Myklebust { 264074cc1deSTrond Myklebust struct nfs_page *req; 265074cc1deSTrond Myklebust int ret = 0; 266074cc1deSTrond Myklebust 267cfb506e1STrond Myklebust req = nfs_find_and_lock_request(page, nonblock); 268074cc1deSTrond Myklebust if (!req) 269074cc1deSTrond Myklebust goto out; 270074cc1deSTrond Myklebust ret = PTR_ERR(req); 271074cc1deSTrond Myklebust if (IS_ERR(req)) 272074cc1deSTrond Myklebust goto out; 273074cc1deSTrond Myklebust 274074cc1deSTrond Myklebust ret = nfs_set_page_writeback(page); 275074cc1deSTrond Myklebust BUG_ON(ret != 0); 276074cc1deSTrond Myklebust BUG_ON(test_bit(PG_CLEAN, &req->wb_flags)); 277074cc1deSTrond Myklebust 278f8512ad0SFred Isaman if (!nfs_pageio_add_request(pgio, req)) { 279f8512ad0SFred Isaman nfs_redirty_request(req); 280074cc1deSTrond Myklebust ret = pgio->pg_error; 281f8512ad0SFred Isaman } 282074cc1deSTrond Myklebust out: 283074cc1deSTrond Myklebust return ret; 284e261f51fSTrond Myklebust } 285e261f51fSTrond Myklebust 286f758c885STrond Myklebust static int nfs_do_writepage(struct page *page, struct writeback_control *wbc, struct nfs_pageio_descriptor *pgio) 287f758c885STrond Myklebust { 288f758c885STrond Myklebust struct inode *inode = page->mapping->host; 289cfb506e1STrond Myklebust int ret; 290f758c885STrond Myklebust 291f758c885STrond Myklebust nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE); 292f758c885STrond Myklebust nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1); 293f758c885STrond Myklebust 294f758c885STrond Myklebust nfs_pageio_cond_complete(pgio, page->index); 2951b430beeSWu Fengguang ret = nfs_page_async_flush(pgio, page, wbc->sync_mode == WB_SYNC_NONE); 296cfb506e1STrond Myklebust if (ret == -EAGAIN) { 297cfb506e1STrond Myklebust redirty_page_for_writepage(wbc, page); 298cfb506e1STrond Myklebust ret = 0; 299cfb506e1STrond Myklebust } 300cfb506e1STrond Myklebust return ret; 301f758c885STrond Myklebust } 302f758c885STrond Myklebust 303e261f51fSTrond Myklebust /* 3041da177e4SLinus Torvalds * Write an mmapped page to the server. 3051da177e4SLinus Torvalds */ 3064d770ccfSTrond Myklebust static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc) 3071da177e4SLinus Torvalds { 308f758c885STrond Myklebust struct nfs_pageio_descriptor pgio; 309e261f51fSTrond Myklebust int err; 3101da177e4SLinus Torvalds 311f758c885STrond Myklebust nfs_pageio_init_write(&pgio, page->mapping->host, wb_priority(wbc)); 312f758c885STrond Myklebust err = nfs_do_writepage(page, wbc, &pgio); 313f758c885STrond Myklebust nfs_pageio_complete(&pgio); 314f758c885STrond Myklebust if (err < 0) 3154d770ccfSTrond Myklebust return err; 316f758c885STrond Myklebust if (pgio.pg_error < 0) 317f758c885STrond Myklebust return pgio.pg_error; 318f758c885STrond Myklebust return 0; 3194d770ccfSTrond Myklebust } 3204d770ccfSTrond Myklebust 3214d770ccfSTrond Myklebust int nfs_writepage(struct page *page, struct writeback_control *wbc) 3224d770ccfSTrond Myklebust { 323f758c885STrond Myklebust int ret; 3244d770ccfSTrond Myklebust 325f758c885STrond Myklebust ret = nfs_writepage_locked(page, wbc); 3261da177e4SLinus Torvalds unlock_page(page); 327f758c885STrond Myklebust return ret; 328f758c885STrond Myklebust } 329f758c885STrond Myklebust 330f758c885STrond Myklebust static int nfs_writepages_callback(struct page *page, struct writeback_control *wbc, void *data) 331f758c885STrond Myklebust { 332f758c885STrond Myklebust int ret; 333f758c885STrond Myklebust 334f758c885STrond Myklebust ret = nfs_do_writepage(page, wbc, data); 335f758c885STrond Myklebust unlock_page(page); 336f758c885STrond Myklebust return ret; 3371da177e4SLinus Torvalds } 3381da177e4SLinus Torvalds 3391da177e4SLinus Torvalds int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc) 3401da177e4SLinus Torvalds { 3411da177e4SLinus Torvalds struct inode *inode = mapping->host; 34272cb77f4STrond Myklebust unsigned long *bitlock = &NFS_I(inode)->flags; 343c63c7b05STrond Myklebust struct nfs_pageio_descriptor pgio; 3441da177e4SLinus Torvalds int err; 3451da177e4SLinus Torvalds 34672cb77f4STrond Myklebust /* Stop dirtying of new pages while we sync */ 34772cb77f4STrond Myklebust err = wait_on_bit_lock(bitlock, NFS_INO_FLUSHING, 34872cb77f4STrond Myklebust nfs_wait_bit_killable, TASK_KILLABLE); 34972cb77f4STrond Myklebust if (err) 35072cb77f4STrond Myklebust goto out_err; 35172cb77f4STrond Myklebust 35291d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES); 35391d5b470SChuck Lever 354c63c7b05STrond Myklebust nfs_pageio_init_write(&pgio, inode, wb_priority(wbc)); 355f758c885STrond Myklebust err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio); 356c63c7b05STrond Myklebust nfs_pageio_complete(&pgio); 35772cb77f4STrond Myklebust 35872cb77f4STrond Myklebust clear_bit_unlock(NFS_INO_FLUSHING, bitlock); 35972cb77f4STrond Myklebust smp_mb__after_clear_bit(); 36072cb77f4STrond Myklebust wake_up_bit(bitlock, NFS_INO_FLUSHING); 36172cb77f4STrond Myklebust 362f758c885STrond Myklebust if (err < 0) 36372cb77f4STrond Myklebust goto out_err; 36472cb77f4STrond Myklebust err = pgio.pg_error; 36572cb77f4STrond Myklebust if (err < 0) 36672cb77f4STrond Myklebust goto out_err; 367c63c7b05STrond Myklebust return 0; 36872cb77f4STrond Myklebust out_err: 36972cb77f4STrond Myklebust return err; 3701da177e4SLinus Torvalds } 3711da177e4SLinus Torvalds 3721da177e4SLinus Torvalds /* 3731da177e4SLinus Torvalds * Insert a write request into an inode 3741da177e4SLinus Torvalds */ 375e7d39069STrond Myklebust static int nfs_inode_add_request(struct inode *inode, struct nfs_page *req) 3761da177e4SLinus Torvalds { 3771da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 3781da177e4SLinus Torvalds int error; 3791da177e4SLinus Torvalds 380e7d39069STrond Myklebust error = radix_tree_preload(GFP_NOFS); 381e7d39069STrond Myklebust if (error != 0) 382e7d39069STrond Myklebust goto out; 383e7d39069STrond Myklebust 384e7d39069STrond Myklebust /* Lock the request! */ 385e7d39069STrond Myklebust nfs_lock_request_dontget(req); 386e7d39069STrond Myklebust 387e7d39069STrond Myklebust spin_lock(&inode->i_lock); 3881da177e4SLinus Torvalds error = radix_tree_insert(&nfsi->nfs_page_tree, req->wb_index, req); 38927852596SNick Piggin BUG_ON(error); 3901da177e4SLinus Torvalds if (!nfsi->npages) { 3911da177e4SLinus Torvalds igrab(inode); 3921da177e4SLinus Torvalds if (nfs_have_delegation(inode, FMODE_WRITE)) 3931da177e4SLinus Torvalds nfsi->change_attr++; 3941da177e4SLinus Torvalds } 3952df485a7STrond Myklebust set_bit(PG_MAPPED, &req->wb_flags); 396deb7d638STrond Myklebust SetPagePrivate(req->wb_page); 397277459d2STrond Myklebust set_page_private(req->wb_page, (unsigned long)req); 3981da177e4SLinus Torvalds nfsi->npages++; 399c03b4024STrond Myklebust kref_get(&req->wb_kref); 40027852596SNick Piggin radix_tree_tag_set(&nfsi->nfs_page_tree, req->wb_index, 40127852596SNick Piggin NFS_PAGE_TAG_LOCKED); 402e7d39069STrond Myklebust spin_unlock(&inode->i_lock); 403e7d39069STrond Myklebust radix_tree_preload_end(); 404e7d39069STrond Myklebust out: 405e7d39069STrond Myklebust return error; 4061da177e4SLinus Torvalds } 4071da177e4SLinus Torvalds 4081da177e4SLinus Torvalds /* 40989a09141SPeter Zijlstra * Remove a write request from an inode 4101da177e4SLinus Torvalds */ 4111da177e4SLinus Torvalds static void nfs_inode_remove_request(struct nfs_page *req) 4121da177e4SLinus Torvalds { 41388be9f99STrond Myklebust struct inode *inode = req->wb_context->path.dentry->d_inode; 4141da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 4151da177e4SLinus Torvalds 4161da177e4SLinus Torvalds BUG_ON (!NFS_WBACK_BUSY(req)); 4171da177e4SLinus Torvalds 418587142f8STrond Myklebust spin_lock(&inode->i_lock); 419277459d2STrond Myklebust set_page_private(req->wb_page, 0); 420deb7d638STrond Myklebust ClearPagePrivate(req->wb_page); 4212df485a7STrond Myklebust clear_bit(PG_MAPPED, &req->wb_flags); 4221da177e4SLinus Torvalds radix_tree_delete(&nfsi->nfs_page_tree, req->wb_index); 4231da177e4SLinus Torvalds nfsi->npages--; 4241da177e4SLinus Torvalds if (!nfsi->npages) { 425587142f8STrond Myklebust spin_unlock(&inode->i_lock); 4261da177e4SLinus Torvalds iput(inode); 4271da177e4SLinus Torvalds } else 428587142f8STrond Myklebust spin_unlock(&inode->i_lock); 4291da177e4SLinus Torvalds nfs_release_request(req); 4301da177e4SLinus Torvalds } 4311da177e4SLinus Torvalds 43261822ab5STrond Myklebust static void 4336d884e8fSFred nfs_mark_request_dirty(struct nfs_page *req) 43461822ab5STrond Myklebust { 43561822ab5STrond Myklebust __set_page_dirty_nobuffers(req->wb_page); 436b80c3cb6STrond Myklebust __mark_inode_dirty(req->wb_page->mapping->host, I_DIRTY_DATASYNC); 43761822ab5STrond Myklebust } 43861822ab5STrond Myklebust 4391da177e4SLinus Torvalds #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) 4401da177e4SLinus Torvalds /* 4411da177e4SLinus Torvalds * Add a request to the inode's commit list. 4421da177e4SLinus Torvalds */ 4431da177e4SLinus Torvalds static void 4441da177e4SLinus Torvalds nfs_mark_request_commit(struct nfs_page *req) 4451da177e4SLinus Torvalds { 44688be9f99STrond Myklebust struct inode *inode = req->wb_context->path.dentry->d_inode; 4471da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 4481da177e4SLinus Torvalds 449587142f8STrond Myklebust spin_lock(&inode->i_lock); 450e468bae9STrond Myklebust set_bit(PG_CLEAN, &(req)->wb_flags); 4515c369683STrond Myklebust radix_tree_tag_set(&nfsi->nfs_page_tree, 4525c369683STrond Myklebust req->wb_index, 4535c369683STrond Myklebust NFS_PAGE_TAG_COMMIT); 454ff778d02STrond Myklebust nfsi->ncommit++; 455587142f8STrond Myklebust spin_unlock(&inode->i_lock); 456fd39fc85SChristoph Lameter inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); 457c9e51e41SPeter Zijlstra inc_bdi_stat(req->wb_page->mapping->backing_dev_info, BDI_RECLAIMABLE); 458a1803044STrond Myklebust __mark_inode_dirty(inode, I_DIRTY_DATASYNC); 4591da177e4SLinus Torvalds } 4608e821cadSTrond Myklebust 461e468bae9STrond Myklebust static int 462e468bae9STrond Myklebust nfs_clear_request_commit(struct nfs_page *req) 463e468bae9STrond Myklebust { 464e468bae9STrond Myklebust struct page *page = req->wb_page; 465e468bae9STrond Myklebust 466e468bae9STrond Myklebust if (test_and_clear_bit(PG_CLEAN, &(req)->wb_flags)) { 467e468bae9STrond Myklebust dec_zone_page_state(page, NR_UNSTABLE_NFS); 468e468bae9STrond Myklebust dec_bdi_stat(page->mapping->backing_dev_info, BDI_RECLAIMABLE); 469e468bae9STrond Myklebust return 1; 470e468bae9STrond Myklebust } 471e468bae9STrond Myklebust return 0; 472e468bae9STrond Myklebust } 473e468bae9STrond Myklebust 4748e821cadSTrond Myklebust static inline 4758e821cadSTrond Myklebust int nfs_write_need_commit(struct nfs_write_data *data) 4768e821cadSTrond Myklebust { 4778e821cadSTrond Myklebust return data->verf.committed != NFS_FILE_SYNC; 4788e821cadSTrond Myklebust } 4798e821cadSTrond Myklebust 4808e821cadSTrond Myklebust static inline 4818e821cadSTrond Myklebust int nfs_reschedule_unstable_write(struct nfs_page *req) 4828e821cadSTrond Myklebust { 483e468bae9STrond Myklebust if (test_and_clear_bit(PG_NEED_COMMIT, &req->wb_flags)) { 4848e821cadSTrond Myklebust nfs_mark_request_commit(req); 4858e821cadSTrond Myklebust return 1; 4868e821cadSTrond Myklebust } 4878e821cadSTrond Myklebust if (test_and_clear_bit(PG_NEED_RESCHED, &req->wb_flags)) { 4886d884e8fSFred nfs_mark_request_dirty(req); 4898e821cadSTrond Myklebust return 1; 4908e821cadSTrond Myklebust } 4918e821cadSTrond Myklebust return 0; 4928e821cadSTrond Myklebust } 4938e821cadSTrond Myklebust #else 4948e821cadSTrond Myklebust static inline void 4958e821cadSTrond Myklebust nfs_mark_request_commit(struct nfs_page *req) 4968e821cadSTrond Myklebust { 4978e821cadSTrond Myklebust } 4988e821cadSTrond Myklebust 499e468bae9STrond Myklebust static inline int 500e468bae9STrond Myklebust nfs_clear_request_commit(struct nfs_page *req) 501e468bae9STrond Myklebust { 502e468bae9STrond Myklebust return 0; 503e468bae9STrond Myklebust } 504e468bae9STrond Myklebust 5058e821cadSTrond Myklebust static inline 5068e821cadSTrond Myklebust int nfs_write_need_commit(struct nfs_write_data *data) 5078e821cadSTrond Myklebust { 5088e821cadSTrond Myklebust return 0; 5098e821cadSTrond Myklebust } 5108e821cadSTrond Myklebust 5118e821cadSTrond Myklebust static inline 5128e821cadSTrond Myklebust int nfs_reschedule_unstable_write(struct nfs_page *req) 5138e821cadSTrond Myklebust { 5148e821cadSTrond Myklebust return 0; 5158e821cadSTrond Myklebust } 5161da177e4SLinus Torvalds #endif 5171da177e4SLinus Torvalds 51847c62564STrond Myklebust #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) 519fb8a1f11STrond Myklebust static int 520fb8a1f11STrond Myklebust nfs_need_commit(struct nfs_inode *nfsi) 521fb8a1f11STrond Myklebust { 522fb8a1f11STrond Myklebust return radix_tree_tagged(&nfsi->nfs_page_tree, NFS_PAGE_TAG_COMMIT); 523fb8a1f11STrond Myklebust } 524fb8a1f11STrond Myklebust 5251da177e4SLinus Torvalds /* 5261da177e4SLinus Torvalds * nfs_scan_commit - Scan an inode for commit requests 5271da177e4SLinus Torvalds * @inode: NFS inode to scan 5281da177e4SLinus Torvalds * @dst: destination list 5291da177e4SLinus Torvalds * @idx_start: lower bound of page->index to scan. 5301da177e4SLinus Torvalds * @npages: idx_start + npages sets the upper bound to scan. 5311da177e4SLinus Torvalds * 5321da177e4SLinus Torvalds * Moves requests from the inode's 'commit' request list. 5331da177e4SLinus Torvalds * The requests are *not* checked to ensure that they form a contiguous set. 5341da177e4SLinus Torvalds */ 5351da177e4SLinus Torvalds static int 536ca52fec1STrond Myklebust nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, unsigned int npages) 5371da177e4SLinus Torvalds { 5381da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 539ff778d02STrond Myklebust int ret; 5403da28eb1STrond Myklebust 541fb8a1f11STrond Myklebust if (!nfs_need_commit(nfsi)) 542fb8a1f11STrond Myklebust return 0; 543fb8a1f11STrond Myklebust 544ff778d02STrond Myklebust ret = nfs_scan_list(nfsi, dst, idx_start, npages, NFS_PAGE_TAG_COMMIT); 545ff778d02STrond Myklebust if (ret > 0) 546ff778d02STrond Myklebust nfsi->ncommit -= ret; 5472928db1fSTrond Myklebust if (nfs_need_commit(NFS_I(inode))) 5482928db1fSTrond Myklebust __mark_inode_dirty(inode, I_DIRTY_DATASYNC); 549ff778d02STrond Myklebust return ret; 5501da177e4SLinus Torvalds } 551c42de9ddSTrond Myklebust #else 552fb8a1f11STrond Myklebust static inline int nfs_need_commit(struct nfs_inode *nfsi) 553fb8a1f11STrond Myklebust { 554fb8a1f11STrond Myklebust return 0; 555fb8a1f11STrond Myklebust } 556fb8a1f11STrond Myklebust 557ca52fec1STrond Myklebust static inline int nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, unsigned int npages) 558c42de9ddSTrond Myklebust { 559c42de9ddSTrond Myklebust return 0; 560c42de9ddSTrond Myklebust } 5611da177e4SLinus Torvalds #endif 5621da177e4SLinus Torvalds 5631da177e4SLinus Torvalds /* 564e7d39069STrond Myklebust * Search for an existing write request, and attempt to update 565e7d39069STrond Myklebust * it to reflect a new dirty region on a given page. 5661da177e4SLinus Torvalds * 567e7d39069STrond Myklebust * If the attempt fails, then the existing request is flushed out 568e7d39069STrond Myklebust * to disk. 5691da177e4SLinus Torvalds */ 570e7d39069STrond Myklebust static struct nfs_page *nfs_try_to_update_request(struct inode *inode, 571e7d39069STrond Myklebust struct page *page, 572e7d39069STrond Myklebust unsigned int offset, 573e7d39069STrond Myklebust unsigned int bytes) 5741da177e4SLinus Torvalds { 575e7d39069STrond Myklebust struct nfs_page *req; 576e7d39069STrond Myklebust unsigned int rqend; 577e7d39069STrond Myklebust unsigned int end; 5781da177e4SLinus Torvalds int error; 579277459d2STrond Myklebust 580e7d39069STrond Myklebust if (!PagePrivate(page)) 581e7d39069STrond Myklebust return NULL; 582e7d39069STrond Myklebust 583e7d39069STrond Myklebust end = offset + bytes; 584e7d39069STrond Myklebust spin_lock(&inode->i_lock); 585e7d39069STrond Myklebust 586e7d39069STrond Myklebust for (;;) { 587e7d39069STrond Myklebust req = nfs_page_find_request_locked(page); 588e7d39069STrond Myklebust if (req == NULL) 589e7d39069STrond Myklebust goto out_unlock; 590e7d39069STrond Myklebust 591e7d39069STrond Myklebust rqend = req->wb_offset + req->wb_bytes; 592e7d39069STrond Myklebust /* 593e7d39069STrond Myklebust * Tell the caller to flush out the request if 594e7d39069STrond Myklebust * the offsets are non-contiguous. 595e7d39069STrond Myklebust * Note: nfs_flush_incompatible() will already 596e7d39069STrond Myklebust * have flushed out requests having wrong owners. 597e7d39069STrond Myklebust */ 598e468bae9STrond Myklebust if (offset > rqend 599e7d39069STrond Myklebust || end < req->wb_offset) 600e7d39069STrond Myklebust goto out_flushme; 601e7d39069STrond Myklebust 602e7d39069STrond Myklebust if (nfs_set_page_tag_locked(req)) 603e7d39069STrond Myklebust break; 604e7d39069STrond Myklebust 605e7d39069STrond Myklebust /* The request is locked, so wait and then retry */ 606587142f8STrond Myklebust spin_unlock(&inode->i_lock); 6071da177e4SLinus Torvalds error = nfs_wait_on_request(req); 6081da177e4SLinus Torvalds nfs_release_request(req); 609e7d39069STrond Myklebust if (error != 0) 610e7d39069STrond Myklebust goto out_err; 611e7d39069STrond Myklebust spin_lock(&inode->i_lock); 6121da177e4SLinus Torvalds } 6131da177e4SLinus Torvalds 614ff778d02STrond Myklebust if (nfs_clear_request_commit(req) && 615e468bae9STrond Myklebust radix_tree_tag_clear(&NFS_I(inode)->nfs_page_tree, 616ff778d02STrond Myklebust req->wb_index, NFS_PAGE_TAG_COMMIT) != NULL) 617ff778d02STrond Myklebust NFS_I(inode)->ncommit--; 618e468bae9STrond Myklebust 6191da177e4SLinus Torvalds /* Okay, the request matches. Update the region */ 6201da177e4SLinus Torvalds if (offset < req->wb_offset) { 6211da177e4SLinus Torvalds req->wb_offset = offset; 6221da177e4SLinus Torvalds req->wb_pgbase = offset; 6231da177e4SLinus Torvalds } 6241da177e4SLinus Torvalds if (end > rqend) 6251da177e4SLinus Torvalds req->wb_bytes = end - req->wb_offset; 626e7d39069STrond Myklebust else 627e7d39069STrond Myklebust req->wb_bytes = rqend - req->wb_offset; 628e7d39069STrond Myklebust out_unlock: 629e7d39069STrond Myklebust spin_unlock(&inode->i_lock); 630e7d39069STrond Myklebust return req; 631e7d39069STrond Myklebust out_flushme: 632e7d39069STrond Myklebust spin_unlock(&inode->i_lock); 633e7d39069STrond Myklebust nfs_release_request(req); 634e7d39069STrond Myklebust error = nfs_wb_page(inode, page); 635e7d39069STrond Myklebust out_err: 636e7d39069STrond Myklebust return ERR_PTR(error); 637e7d39069STrond Myklebust } 6381da177e4SLinus Torvalds 639e7d39069STrond Myklebust /* 640e7d39069STrond Myklebust * Try to update an existing write request, or create one if there is none. 641e7d39069STrond Myklebust * 642e7d39069STrond Myklebust * Note: Should always be called with the Page Lock held to prevent races 643e7d39069STrond Myklebust * if we have to add a new request. Also assumes that the caller has 644e7d39069STrond Myklebust * already called nfs_flush_incompatible() if necessary. 645e7d39069STrond Myklebust */ 646e7d39069STrond Myklebust static struct nfs_page * nfs_setup_write_request(struct nfs_open_context* ctx, 647e7d39069STrond Myklebust struct page *page, unsigned int offset, unsigned int bytes) 648e7d39069STrond Myklebust { 649e7d39069STrond Myklebust struct inode *inode = page->mapping->host; 650e7d39069STrond Myklebust struct nfs_page *req; 651e7d39069STrond Myklebust int error; 652e7d39069STrond Myklebust 653e7d39069STrond Myklebust req = nfs_try_to_update_request(inode, page, offset, bytes); 654e7d39069STrond Myklebust if (req != NULL) 655e7d39069STrond Myklebust goto out; 656e7d39069STrond Myklebust req = nfs_create_request(ctx, inode, page, offset, bytes); 657e7d39069STrond Myklebust if (IS_ERR(req)) 658e7d39069STrond Myklebust goto out; 659e7d39069STrond Myklebust error = nfs_inode_add_request(inode, req); 660e7d39069STrond Myklebust if (error != 0) { 661e7d39069STrond Myklebust nfs_release_request(req); 662e7d39069STrond Myklebust req = ERR_PTR(error); 663e7d39069STrond Myklebust } 664efc91ed0STrond Myklebust out: 66561e930a9STrond Myklebust return req; 6661da177e4SLinus Torvalds } 6671da177e4SLinus Torvalds 668e7d39069STrond Myklebust static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page, 669e7d39069STrond Myklebust unsigned int offset, unsigned int count) 670e7d39069STrond Myklebust { 671e7d39069STrond Myklebust struct nfs_page *req; 672e7d39069STrond Myklebust 673e7d39069STrond Myklebust req = nfs_setup_write_request(ctx, page, offset, count); 674e7d39069STrond Myklebust if (IS_ERR(req)) 675e7d39069STrond Myklebust return PTR_ERR(req); 676b80c3cb6STrond Myklebust nfs_mark_request_dirty(req); 677e7d39069STrond Myklebust /* Update file length */ 678e7d39069STrond Myklebust nfs_grow_file(page, offset, count); 679e7d39069STrond Myklebust nfs_mark_uptodate(page, req->wb_pgbase, req->wb_bytes); 680a6305ddbSTrond Myklebust nfs_mark_request_dirty(req); 681e7d39069STrond Myklebust nfs_clear_page_tag_locked(req); 682e7d39069STrond Myklebust return 0; 683e7d39069STrond Myklebust } 684e7d39069STrond Myklebust 6851da177e4SLinus Torvalds int nfs_flush_incompatible(struct file *file, struct page *page) 6861da177e4SLinus Torvalds { 687cd3758e3STrond Myklebust struct nfs_open_context *ctx = nfs_file_open_context(file); 6881da177e4SLinus Torvalds struct nfs_page *req; 6891a54533eSTrond Myklebust int do_flush, status; 6901da177e4SLinus Torvalds /* 6911da177e4SLinus Torvalds * Look for a request corresponding to this page. If there 6921da177e4SLinus Torvalds * is one, and it belongs to another file, we flush it out 6931da177e4SLinus Torvalds * before we try to copy anything into the page. Do this 6941da177e4SLinus Torvalds * due to the lack of an ACCESS-type call in NFSv2. 6951da177e4SLinus Torvalds * Also do the same if we find a request from an existing 6961da177e4SLinus Torvalds * dropped page. 6971da177e4SLinus Torvalds */ 6981a54533eSTrond Myklebust do { 699277459d2STrond Myklebust req = nfs_page_find_request(page); 7001a54533eSTrond Myklebust if (req == NULL) 7011a54533eSTrond Myklebust return 0; 702f11ac8dbSTrond Myklebust do_flush = req->wb_page != page || req->wb_context != ctx || 703f11ac8dbSTrond Myklebust req->wb_lock_context->lockowner != current->files || 704f11ac8dbSTrond Myklebust req->wb_lock_context->pid != current->tgid; 7051da177e4SLinus Torvalds nfs_release_request(req); 7061a54533eSTrond Myklebust if (!do_flush) 7071a54533eSTrond Myklebust return 0; 708277459d2STrond Myklebust status = nfs_wb_page(page->mapping->host, page); 7091a54533eSTrond Myklebust } while (status == 0); 7101a54533eSTrond Myklebust return status; 7111da177e4SLinus Torvalds } 7121da177e4SLinus Torvalds 7131da177e4SLinus Torvalds /* 7145d47a356STrond Myklebust * If the page cache is marked as unsafe or invalid, then we can't rely on 7155d47a356STrond Myklebust * the PageUptodate() flag. In this case, we will need to turn off 7165d47a356STrond Myklebust * write optimisations that depend on the page contents being correct. 7175d47a356STrond Myklebust */ 7185d47a356STrond Myklebust static int nfs_write_pageuptodate(struct page *page, struct inode *inode) 7195d47a356STrond Myklebust { 7205d47a356STrond Myklebust return PageUptodate(page) && 7215d47a356STrond Myklebust !(NFS_I(inode)->cache_validity & (NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA)); 7225d47a356STrond Myklebust } 7235d47a356STrond Myklebust 7245d47a356STrond Myklebust /* 7251da177e4SLinus Torvalds * Update and possibly write a cached page of an NFS file. 7261da177e4SLinus Torvalds * 7271da177e4SLinus Torvalds * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad 7281da177e4SLinus Torvalds * things with a page scheduled for an RPC call (e.g. invalidate it). 7291da177e4SLinus Torvalds */ 7301da177e4SLinus Torvalds int nfs_updatepage(struct file *file, struct page *page, 7311da177e4SLinus Torvalds unsigned int offset, unsigned int count) 7321da177e4SLinus Torvalds { 733cd3758e3STrond Myklebust struct nfs_open_context *ctx = nfs_file_open_context(file); 7341da177e4SLinus Torvalds struct inode *inode = page->mapping->host; 7351da177e4SLinus Torvalds int status = 0; 7361da177e4SLinus Torvalds 73791d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE); 73891d5b470SChuck Lever 73948186c7dSChuck Lever dprintk("NFS: nfs_updatepage(%s/%s %d@%lld)\n", 74001cce933SJosef "Jeff" Sipek file->f_path.dentry->d_parent->d_name.name, 74101cce933SJosef "Jeff" Sipek file->f_path.dentry->d_name.name, count, 7420bbacc40SChuck Lever (long long)(page_offset(page) + offset)); 7431da177e4SLinus Torvalds 7441da177e4SLinus Torvalds /* If we're not using byte range locks, and we know the page 7455d47a356STrond Myklebust * is up to date, it may be more efficient to extend the write 7465d47a356STrond Myklebust * to cover the entire page in order to avoid fragmentation 7475d47a356STrond Myklebust * inefficiencies. 7481da177e4SLinus Torvalds */ 7495d47a356STrond Myklebust if (nfs_write_pageuptodate(page, inode) && 7505d47a356STrond Myklebust inode->i_flock == NULL && 7516b2f3d1fSChristoph Hellwig !(file->f_flags & O_DSYNC)) { 75249a70f27STrond Myklebust count = max(count + offset, nfs_page_length(page)); 7531da177e4SLinus Torvalds offset = 0; 7541da177e4SLinus Torvalds } 7551da177e4SLinus Torvalds 756e21195a7STrond Myklebust status = nfs_writepage_setup(ctx, page, offset, count); 75703fa9e84STrond Myklebust if (status < 0) 75803fa9e84STrond Myklebust nfs_set_pageerror(page); 7591da177e4SLinus Torvalds 76048186c7dSChuck Lever dprintk("NFS: nfs_updatepage returns %d (isize %lld)\n", 7611da177e4SLinus Torvalds status, (long long)i_size_read(inode)); 7621da177e4SLinus Torvalds return status; 7631da177e4SLinus Torvalds } 7641da177e4SLinus Torvalds 7651da177e4SLinus Torvalds static void nfs_writepage_release(struct nfs_page *req) 7661da177e4SLinus Torvalds { 767a6305ddbSTrond Myklebust struct page *page = req->wb_page; 7688e821cadSTrond Myklebust 769a6305ddbSTrond Myklebust if (PageError(req->wb_page) || !nfs_reschedule_unstable_write(req)) 7701da177e4SLinus Torvalds nfs_inode_remove_request(req); 7719fd367f0STrond Myklebust nfs_clear_page_tag_locked(req); 772a6305ddbSTrond Myklebust nfs_end_page_writeback(page); 7731da177e4SLinus Torvalds } 7741da177e4SLinus Torvalds 7753ff7576dSTrond Myklebust static int flush_task_priority(int how) 7761da177e4SLinus Torvalds { 7771da177e4SLinus Torvalds switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) { 7781da177e4SLinus Torvalds case FLUSH_HIGHPRI: 7791da177e4SLinus Torvalds return RPC_PRIORITY_HIGH; 7801da177e4SLinus Torvalds case FLUSH_LOWPRI: 7811da177e4SLinus Torvalds return RPC_PRIORITY_LOW; 7821da177e4SLinus Torvalds } 7831da177e4SLinus Torvalds return RPC_PRIORITY_NORMAL; 7841da177e4SLinus Torvalds } 7851da177e4SLinus Torvalds 786a69aef14SFred Isaman int nfs_initiate_write(struct nfs_write_data *data, 787d138d5d1SAndy Adamson struct rpc_clnt *clnt, 788788e7a89STrond Myklebust const struct rpc_call_ops *call_ops, 7891da177e4SLinus Torvalds int how) 7901da177e4SLinus Torvalds { 791d138d5d1SAndy Adamson struct inode *inode = data->inode; 7923ff7576dSTrond Myklebust int priority = flush_task_priority(how); 79307737691STrond Myklebust struct rpc_task *task; 794bdc7f021STrond Myklebust struct rpc_message msg = { 795bdc7f021STrond Myklebust .rpc_argp = &data->args, 796bdc7f021STrond Myklebust .rpc_resp = &data->res, 797d138d5d1SAndy Adamson .rpc_cred = data->cred, 798bdc7f021STrond Myklebust }; 79984115e1cSTrond Myklebust struct rpc_task_setup task_setup_data = { 800d138d5d1SAndy Adamson .rpc_client = clnt, 80107737691STrond Myklebust .task = &data->task, 802bdc7f021STrond Myklebust .rpc_message = &msg, 80384115e1cSTrond Myklebust .callback_ops = call_ops, 80484115e1cSTrond Myklebust .callback_data = data, 805101070caSTrond Myklebust .workqueue = nfsiod_workqueue, 8062c61be0aSTrond Myklebust .flags = RPC_TASK_ASYNC, 8073ff7576dSTrond Myklebust .priority = priority, 80884115e1cSTrond Myklebust }; 8092c61be0aSTrond Myklebust int ret = 0; 8101da177e4SLinus Torvalds 811d138d5d1SAndy Adamson /* Set up the initial task struct. */ 812d138d5d1SAndy Adamson NFS_PROTO(inode)->write_setup(data, &msg); 813d138d5d1SAndy Adamson 814d138d5d1SAndy Adamson dprintk("NFS: %5u initiated write call " 815d138d5d1SAndy Adamson "(req %s/%lld, %u bytes @ offset %llu)\n", 816d138d5d1SAndy Adamson data->task.tk_pid, 817d138d5d1SAndy Adamson inode->i_sb->s_id, 818d138d5d1SAndy Adamson (long long)NFS_FILEID(inode), 819d138d5d1SAndy Adamson data->args.count, 820d138d5d1SAndy Adamson (unsigned long long)data->args.offset); 821d138d5d1SAndy Adamson 822d138d5d1SAndy Adamson task = rpc_run_task(&task_setup_data); 823d138d5d1SAndy Adamson if (IS_ERR(task)) { 824d138d5d1SAndy Adamson ret = PTR_ERR(task); 825d138d5d1SAndy Adamson goto out; 826d138d5d1SAndy Adamson } 827d138d5d1SAndy Adamson if (how & FLUSH_SYNC) { 828d138d5d1SAndy Adamson ret = rpc_wait_for_completion_task(task); 829d138d5d1SAndy Adamson if (ret == 0) 830d138d5d1SAndy Adamson ret = task->tk_status; 831d138d5d1SAndy Adamson } 832d138d5d1SAndy Adamson rpc_put_task(task); 833d138d5d1SAndy Adamson out: 834d138d5d1SAndy Adamson return ret; 835d138d5d1SAndy Adamson } 836a69aef14SFred Isaman EXPORT_SYMBOL_GPL(nfs_initiate_write); 837d138d5d1SAndy Adamson 838d138d5d1SAndy Adamson /* 839d138d5d1SAndy Adamson * Set up the argument/result storage required for the RPC call. 840d138d5d1SAndy Adamson */ 841d138d5d1SAndy Adamson static int nfs_write_rpcsetup(struct nfs_page *req, 842d138d5d1SAndy Adamson struct nfs_write_data *data, 843d138d5d1SAndy Adamson const struct rpc_call_ops *call_ops, 844d138d5d1SAndy Adamson unsigned int count, unsigned int offset, 8455053aa56SFred Isaman struct pnfs_layout_segment *lseg, 846d138d5d1SAndy Adamson int how) 847d138d5d1SAndy Adamson { 848d138d5d1SAndy Adamson struct inode *inode = req->wb_context->path.dentry->d_inode; 849d138d5d1SAndy Adamson 8501da177e4SLinus Torvalds /* Set up the RPC argument and reply structs 8511da177e4SLinus Torvalds * NB: take care not to mess about with data->commit et al. */ 8521da177e4SLinus Torvalds 8531da177e4SLinus Torvalds data->req = req; 85488be9f99STrond Myklebust data->inode = inode = req->wb_context->path.dentry->d_inode; 855d138d5d1SAndy Adamson data->cred = req->wb_context->cred; 8565053aa56SFred Isaman data->lseg = get_lseg(lseg); 8571da177e4SLinus Torvalds 8581da177e4SLinus Torvalds data->args.fh = NFS_FH(inode); 8591da177e4SLinus Torvalds data->args.offset = req_offset(req) + offset; 8601da177e4SLinus Torvalds data->args.pgbase = req->wb_pgbase + offset; 8611da177e4SLinus Torvalds data->args.pages = data->pagevec; 8621da177e4SLinus Torvalds data->args.count = count; 863383ba719STrond Myklebust data->args.context = get_nfs_open_context(req->wb_context); 864f11ac8dbSTrond Myklebust data->args.lock_context = req->wb_lock_context; 865bdc7f021STrond Myklebust data->args.stable = NFS_UNSTABLE; 866b31268acSTrond Myklebust if (how & (FLUSH_STABLE | FLUSH_COND_STABLE)) { 867bdc7f021STrond Myklebust data->args.stable = NFS_DATA_SYNC; 868fb8a1f11STrond Myklebust if (!nfs_need_commit(NFS_I(inode))) 869bdc7f021STrond Myklebust data->args.stable = NFS_FILE_SYNC; 870bdc7f021STrond Myklebust } 8711da177e4SLinus Torvalds 8721da177e4SLinus Torvalds data->res.fattr = &data->fattr; 8731da177e4SLinus Torvalds data->res.count = count; 8741da177e4SLinus Torvalds data->res.verf = &data->verf; 8750e574af1STrond Myklebust nfs_fattr_init(&data->fattr); 8761da177e4SLinus Torvalds 8770382b744SAndy Adamson if (data->lseg && 8780382b744SAndy Adamson (pnfs_try_to_write_data(data, call_ops, how) == PNFS_ATTEMPTED)) 8790382b744SAndy Adamson return 0; 8800382b744SAndy Adamson 881d138d5d1SAndy Adamson return nfs_initiate_write(data, NFS_CLIENT(inode), call_ops, how); 8821da177e4SLinus Torvalds } 8831da177e4SLinus Torvalds 8846d884e8fSFred /* If a nfs_flush_* function fails, it should remove reqs from @head and 8856d884e8fSFred * call this on each, which will prepare them to be retried on next 8866d884e8fSFred * writeback using standard nfs. 8876d884e8fSFred */ 8886d884e8fSFred static void nfs_redirty_request(struct nfs_page *req) 8896d884e8fSFred { 890a6305ddbSTrond Myklebust struct page *page = req->wb_page; 891a6305ddbSTrond Myklebust 8926d884e8fSFred nfs_mark_request_dirty(req); 8936d884e8fSFred nfs_clear_page_tag_locked(req); 894a6305ddbSTrond Myklebust nfs_end_page_writeback(page); 8956d884e8fSFred } 8966d884e8fSFred 8971da177e4SLinus Torvalds /* 8981da177e4SLinus Torvalds * Generate multiple small requests to write out a single 8991da177e4SLinus Torvalds * contiguous dirty area on one page. 9001da177e4SLinus Torvalds */ 901c76069bdSFred Isaman static int nfs_flush_multi(struct nfs_pageio_descriptor *desc) 9021da177e4SLinus Torvalds { 903c76069bdSFred Isaman struct nfs_page *req = nfs_list_entry(desc->pg_list.next); 9041da177e4SLinus Torvalds struct page *page = req->wb_page; 9051da177e4SLinus Torvalds struct nfs_write_data *data; 906c76069bdSFred Isaman size_t wsize = NFS_SERVER(desc->pg_inode)->wsize, nbytes; 907e9f7bee1STrond Myklebust unsigned int offset; 9081da177e4SLinus Torvalds int requests = 0; 909dbae4c73STrond Myklebust int ret = 0; 910c76069bdSFred Isaman struct pnfs_layout_segment *lseg; 9111da177e4SLinus Torvalds LIST_HEAD(list); 9121da177e4SLinus Torvalds 9131da177e4SLinus Torvalds nfs_list_remove_request(req); 9141da177e4SLinus Torvalds 915b31268acSTrond Myklebust if ((desc->pg_ioflags & FLUSH_COND_STABLE) && 916b31268acSTrond Myklebust (desc->pg_moreio || NFS_I(desc->pg_inode)->ncommit || 917b31268acSTrond Myklebust desc->pg_count > wsize)) 918b31268acSTrond Myklebust desc->pg_ioflags &= ~FLUSH_COND_STABLE; 919b31268acSTrond Myklebust 920b31268acSTrond Myklebust 921c76069bdSFred Isaman nbytes = desc->pg_count; 922e9f7bee1STrond Myklebust do { 923e9f7bee1STrond Myklebust size_t len = min(nbytes, wsize); 924e9f7bee1STrond Myklebust 9258d5658c9STrond Myklebust data = nfs_writedata_alloc(1); 9261da177e4SLinus Torvalds if (!data) 9271da177e4SLinus Torvalds goto out_bad; 9281da177e4SLinus Torvalds list_add(&data->pages, &list); 9291da177e4SLinus Torvalds requests++; 930e9f7bee1STrond Myklebust nbytes -= len; 931e9f7bee1STrond Myklebust } while (nbytes != 0); 9321da177e4SLinus Torvalds atomic_set(&req->wb_complete, requests); 9331da177e4SLinus Torvalds 934c76069bdSFred Isaman BUG_ON(desc->pg_lseg); 935c76069bdSFred Isaman lseg = pnfs_update_layout(desc->pg_inode, req->wb_context, IOMODE_RW); 9361da177e4SLinus Torvalds ClearPageError(page); 9371da177e4SLinus Torvalds offset = 0; 938c76069bdSFred Isaman nbytes = desc->pg_count; 9391da177e4SLinus Torvalds do { 940dbae4c73STrond Myklebust int ret2; 941dbae4c73STrond Myklebust 9421da177e4SLinus Torvalds data = list_entry(list.next, struct nfs_write_data, pages); 9431da177e4SLinus Torvalds list_del_init(&data->pages); 9441da177e4SLinus Torvalds 9451da177e4SLinus Torvalds data->pagevec[0] = page; 9461da177e4SLinus Torvalds 947bcb71bbaSTrond Myklebust if (nbytes < wsize) 948bcb71bbaSTrond Myklebust wsize = nbytes; 949dbae4c73STrond Myklebust ret2 = nfs_write_rpcsetup(req, data, &nfs_write_partial_ops, 950c76069bdSFred Isaman wsize, offset, lseg, desc->pg_ioflags); 951dbae4c73STrond Myklebust if (ret == 0) 952dbae4c73STrond Myklebust ret = ret2; 9531da177e4SLinus Torvalds offset += wsize; 9541da177e4SLinus Torvalds nbytes -= wsize; 9551da177e4SLinus Torvalds } while (nbytes != 0); 9561da177e4SLinus Torvalds 95744b83799SFred Isaman put_lseg(lseg); 95836fe432dSFred Isaman desc->pg_lseg = NULL; 959dbae4c73STrond Myklebust return ret; 9601da177e4SLinus Torvalds 9611da177e4SLinus Torvalds out_bad: 9621da177e4SLinus Torvalds while (!list_empty(&list)) { 9631da177e4SLinus Torvalds data = list_entry(list.next, struct nfs_write_data, pages); 9641da177e4SLinus Torvalds list_del(&data->pages); 9650da2a4acSFred Isaman nfs_writedata_free(data); 9661da177e4SLinus Torvalds } 96761822ab5STrond Myklebust nfs_redirty_request(req); 9681da177e4SLinus Torvalds return -ENOMEM; 9691da177e4SLinus Torvalds } 9701da177e4SLinus Torvalds 9711da177e4SLinus Torvalds /* 9721da177e4SLinus Torvalds * Create an RPC task for the given write request and kick it. 9731da177e4SLinus Torvalds * The page must have been locked by the caller. 9741da177e4SLinus Torvalds * 9751da177e4SLinus Torvalds * It may happen that the page we're passed is not marked dirty. 9761da177e4SLinus Torvalds * This is the case if nfs_updatepage detects a conflicting request 9771da177e4SLinus Torvalds * that has been written but not committed. 9781da177e4SLinus Torvalds */ 979c76069bdSFred Isaman static int nfs_flush_one(struct nfs_pageio_descriptor *desc) 9801da177e4SLinus Torvalds { 9811da177e4SLinus Torvalds struct nfs_page *req; 9821da177e4SLinus Torvalds struct page **pages; 9831da177e4SLinus Torvalds struct nfs_write_data *data; 984c76069bdSFred Isaman struct list_head *head = &desc->pg_list; 985c76069bdSFred Isaman struct pnfs_layout_segment *lseg = desc->pg_lseg; 98644b83799SFred Isaman int ret; 9871da177e4SLinus Torvalds 988c76069bdSFred Isaman data = nfs_writedata_alloc(nfs_page_array_len(desc->pg_base, 989c76069bdSFred Isaman desc->pg_count)); 99044b83799SFred Isaman if (!data) { 99144b83799SFred Isaman while (!list_empty(head)) { 99244b83799SFred Isaman req = nfs_list_entry(head->next); 99344b83799SFred Isaman nfs_list_remove_request(req); 99444b83799SFred Isaman nfs_redirty_request(req); 99544b83799SFred Isaman } 99644b83799SFred Isaman ret = -ENOMEM; 99744b83799SFred Isaman goto out; 99844b83799SFred Isaman } 9991da177e4SLinus Torvalds pages = data->pagevec; 10001da177e4SLinus Torvalds while (!list_empty(head)) { 10011da177e4SLinus Torvalds req = nfs_list_entry(head->next); 10021da177e4SLinus Torvalds nfs_list_remove_request(req); 10031da177e4SLinus Torvalds nfs_list_add_request(req, &data->pages); 10041da177e4SLinus Torvalds ClearPageError(req->wb_page); 10051da177e4SLinus Torvalds *pages++ = req->wb_page; 10061da177e4SLinus Torvalds } 10071da177e4SLinus Torvalds req = nfs_list_entry(data->pages.next); 100844b83799SFred Isaman if ((!lseg) && list_is_singular(&data->pages)) 1009c76069bdSFred Isaman lseg = pnfs_update_layout(desc->pg_inode, req->wb_context, IOMODE_RW); 10101da177e4SLinus Torvalds 1011b31268acSTrond Myklebust if ((desc->pg_ioflags & FLUSH_COND_STABLE) && 1012b31268acSTrond Myklebust (desc->pg_moreio || NFS_I(desc->pg_inode)->ncommit)) 1013b31268acSTrond Myklebust desc->pg_ioflags &= ~FLUSH_COND_STABLE; 1014b31268acSTrond Myklebust 10151da177e4SLinus Torvalds /* Set up the argument struct */ 1016c76069bdSFred Isaman ret = nfs_write_rpcsetup(req, data, &nfs_write_full_ops, desc->pg_count, 0, lseg, desc->pg_ioflags); 101744b83799SFred Isaman out: 101844b83799SFred Isaman put_lseg(lseg); /* Cleans any gotten in ->pg_test */ 101936fe432dSFred Isaman desc->pg_lseg = NULL; 102044b83799SFred Isaman return ret; 10211da177e4SLinus Torvalds } 10221da177e4SLinus Torvalds 1023c63c7b05STrond Myklebust static void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, 1024c63c7b05STrond Myklebust struct inode *inode, int ioflags) 10251da177e4SLinus Torvalds { 1026bf4285e7SChuck Lever size_t wsize = NFS_SERVER(inode)->wsize; 10271da177e4SLinus Torvalds 102844b83799SFred Isaman pnfs_pageio_init_write(pgio, inode); 102994ad1c80SFred Isaman 1030bcb71bbaSTrond Myklebust if (wsize < PAGE_CACHE_SIZE) 1031c63c7b05STrond Myklebust nfs_pageio_init(pgio, inode, nfs_flush_multi, wsize, ioflags); 1032bcb71bbaSTrond Myklebust else 1033c63c7b05STrond Myklebust nfs_pageio_init(pgio, inode, nfs_flush_one, wsize, ioflags); 10341da177e4SLinus Torvalds } 10351da177e4SLinus Torvalds 10361da177e4SLinus Torvalds /* 10371da177e4SLinus Torvalds * Handle a write reply that flushed part of a page. 10381da177e4SLinus Torvalds */ 1039788e7a89STrond Myklebust static void nfs_writeback_done_partial(struct rpc_task *task, void *calldata) 10401da177e4SLinus Torvalds { 1041788e7a89STrond Myklebust struct nfs_write_data *data = calldata; 10421da177e4SLinus Torvalds 104348186c7dSChuck Lever dprintk("NFS: %5u write(%s/%lld %d@%lld)", 104448186c7dSChuck Lever task->tk_pid, 104548186c7dSChuck Lever data->req->wb_context->path.dentry->d_inode->i_sb->s_id, 104648186c7dSChuck Lever (long long) 104748186c7dSChuck Lever NFS_FILEID(data->req->wb_context->path.dentry->d_inode), 104848186c7dSChuck Lever data->req->wb_bytes, (long long)req_offset(data->req)); 10491da177e4SLinus Torvalds 1050c9d8f89dSTrond Myklebust nfs_writeback_done(task, data); 1051c9d8f89dSTrond Myklebust } 1052788e7a89STrond Myklebust 1053c9d8f89dSTrond Myklebust static void nfs_writeback_release_partial(void *calldata) 1054c9d8f89dSTrond Myklebust { 1055c9d8f89dSTrond Myklebust struct nfs_write_data *data = calldata; 1056c9d8f89dSTrond Myklebust struct nfs_page *req = data->req; 1057c9d8f89dSTrond Myklebust struct page *page = req->wb_page; 1058c9d8f89dSTrond Myklebust int status = data->task.tk_status; 1059c9d8f89dSTrond Myklebust 1060c9d8f89dSTrond Myklebust if (status < 0) { 1061a301b777STrond Myklebust nfs_set_pageerror(page); 1062c9d8f89dSTrond Myklebust nfs_context_set_write_error(req->wb_context, status); 1063c9d8f89dSTrond Myklebust dprintk(", error = %d\n", status); 10648e821cadSTrond Myklebust goto out; 10658e821cadSTrond Myklebust } 10668e821cadSTrond Myklebust 10678e821cadSTrond Myklebust if (nfs_write_need_commit(data)) { 1068587142f8STrond Myklebust struct inode *inode = page->mapping->host; 10698e821cadSTrond Myklebust 1070587142f8STrond Myklebust spin_lock(&inode->i_lock); 10718e821cadSTrond Myklebust if (test_bit(PG_NEED_RESCHED, &req->wb_flags)) { 10728e821cadSTrond Myklebust /* Do nothing we need to resend the writes */ 10738e821cadSTrond Myklebust } else if (!test_and_set_bit(PG_NEED_COMMIT, &req->wb_flags)) { 10741da177e4SLinus Torvalds memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); 10751da177e4SLinus Torvalds dprintk(" defer commit\n"); 10761da177e4SLinus Torvalds } else if (memcmp(&req->wb_verf, &data->verf, sizeof(req->wb_verf))) { 10778e821cadSTrond Myklebust set_bit(PG_NEED_RESCHED, &req->wb_flags); 10788e821cadSTrond Myklebust clear_bit(PG_NEED_COMMIT, &req->wb_flags); 10791da177e4SLinus Torvalds dprintk(" server reboot detected\n"); 10801da177e4SLinus Torvalds } 1081587142f8STrond Myklebust spin_unlock(&inode->i_lock); 10821da177e4SLinus Torvalds } else 10831da177e4SLinus Torvalds dprintk(" OK\n"); 10841da177e4SLinus Torvalds 10858e821cadSTrond Myklebust out: 10861da177e4SLinus Torvalds if (atomic_dec_and_test(&req->wb_complete)) 10871da177e4SLinus Torvalds nfs_writepage_release(req); 1088c9d8f89dSTrond Myklebust nfs_writedata_release(calldata); 10891da177e4SLinus Torvalds } 10901da177e4SLinus Torvalds 1091def6ed7eSAndy Adamson #if defined(CONFIG_NFS_V4_1) 1092def6ed7eSAndy Adamson void nfs_write_prepare(struct rpc_task *task, void *calldata) 1093def6ed7eSAndy Adamson { 1094def6ed7eSAndy Adamson struct nfs_write_data *data = calldata; 1095def6ed7eSAndy Adamson 1096035168abSTrond Myklebust if (nfs4_setup_sequence(NFS_SERVER(data->inode), 1097035168abSTrond Myklebust &data->args.seq_args, 1098def6ed7eSAndy Adamson &data->res.seq_res, 1, task)) 1099def6ed7eSAndy Adamson return; 1100def6ed7eSAndy Adamson rpc_call_start(task); 1101def6ed7eSAndy Adamson } 1102def6ed7eSAndy Adamson #endif /* CONFIG_NFS_V4_1 */ 1103def6ed7eSAndy Adamson 1104788e7a89STrond Myklebust static const struct rpc_call_ops nfs_write_partial_ops = { 1105def6ed7eSAndy Adamson #if defined(CONFIG_NFS_V4_1) 1106def6ed7eSAndy Adamson .rpc_call_prepare = nfs_write_prepare, 1107def6ed7eSAndy Adamson #endif /* CONFIG_NFS_V4_1 */ 1108788e7a89STrond Myklebust .rpc_call_done = nfs_writeback_done_partial, 1109c9d8f89dSTrond Myklebust .rpc_release = nfs_writeback_release_partial, 1110788e7a89STrond Myklebust }; 1111788e7a89STrond Myklebust 11121da177e4SLinus Torvalds /* 11131da177e4SLinus Torvalds * Handle a write reply that flushes a whole page. 11141da177e4SLinus Torvalds * 11151da177e4SLinus Torvalds * FIXME: There is an inherent race with invalidate_inode_pages and 11161da177e4SLinus Torvalds * writebacks since the page->count is kept > 1 for as long 11171da177e4SLinus Torvalds * as the page has a write request pending. 11181da177e4SLinus Torvalds */ 1119788e7a89STrond Myklebust static void nfs_writeback_done_full(struct rpc_task *task, void *calldata) 11201da177e4SLinus Torvalds { 1121788e7a89STrond Myklebust struct nfs_write_data *data = calldata; 11221da177e4SLinus Torvalds 1123c9d8f89dSTrond Myklebust nfs_writeback_done(task, data); 1124c9d8f89dSTrond Myklebust } 1125c9d8f89dSTrond Myklebust 1126c9d8f89dSTrond Myklebust static void nfs_writeback_release_full(void *calldata) 1127c9d8f89dSTrond Myklebust { 1128c9d8f89dSTrond Myklebust struct nfs_write_data *data = calldata; 1129c9d8f89dSTrond Myklebust int status = data->task.tk_status; 1130788e7a89STrond Myklebust 11311da177e4SLinus Torvalds /* Update attributes as result of writeback. */ 11321da177e4SLinus Torvalds while (!list_empty(&data->pages)) { 1133c9d8f89dSTrond Myklebust struct nfs_page *req = nfs_list_entry(data->pages.next); 1134c9d8f89dSTrond Myklebust struct page *page = req->wb_page; 1135c9d8f89dSTrond Myklebust 11361da177e4SLinus Torvalds nfs_list_remove_request(req); 11371da177e4SLinus Torvalds 113848186c7dSChuck Lever dprintk("NFS: %5u write (%s/%lld %d@%lld)", 113948186c7dSChuck Lever data->task.tk_pid, 114088be9f99STrond Myklebust req->wb_context->path.dentry->d_inode->i_sb->s_id, 114188be9f99STrond Myklebust (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), 11421da177e4SLinus Torvalds req->wb_bytes, 11431da177e4SLinus Torvalds (long long)req_offset(req)); 11441da177e4SLinus Torvalds 1145c9d8f89dSTrond Myklebust if (status < 0) { 1146a301b777STrond Myklebust nfs_set_pageerror(page); 1147c9d8f89dSTrond Myklebust nfs_context_set_write_error(req->wb_context, status); 1148c9d8f89dSTrond Myklebust dprintk(", error = %d\n", status); 11498e821cadSTrond Myklebust goto remove_request; 11501da177e4SLinus Torvalds } 11511da177e4SLinus Torvalds 11528e821cadSTrond Myklebust if (nfs_write_need_commit(data)) { 11531da177e4SLinus Torvalds memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); 11541da177e4SLinus Torvalds nfs_mark_request_commit(req); 11551da177e4SLinus Torvalds dprintk(" marked for commit\n"); 11568e821cadSTrond Myklebust goto next; 11578e821cadSTrond Myklebust } 11588e821cadSTrond Myklebust dprintk(" OK\n"); 11598e821cadSTrond Myklebust remove_request: 11601da177e4SLinus Torvalds nfs_inode_remove_request(req); 11611da177e4SLinus Torvalds next: 11629fd367f0STrond Myklebust nfs_clear_page_tag_locked(req); 1163a6305ddbSTrond Myklebust nfs_end_page_writeback(page); 11641da177e4SLinus Torvalds } 1165c9d8f89dSTrond Myklebust nfs_writedata_release(calldata); 11661da177e4SLinus Torvalds } 11671da177e4SLinus Torvalds 1168788e7a89STrond Myklebust static const struct rpc_call_ops nfs_write_full_ops = { 1169def6ed7eSAndy Adamson #if defined(CONFIG_NFS_V4_1) 1170def6ed7eSAndy Adamson .rpc_call_prepare = nfs_write_prepare, 1171def6ed7eSAndy Adamson #endif /* CONFIG_NFS_V4_1 */ 1172788e7a89STrond Myklebust .rpc_call_done = nfs_writeback_done_full, 1173c9d8f89dSTrond Myklebust .rpc_release = nfs_writeback_release_full, 1174788e7a89STrond Myklebust }; 1175788e7a89STrond Myklebust 1176788e7a89STrond Myklebust 11771da177e4SLinus Torvalds /* 11781da177e4SLinus Torvalds * This function is called when the WRITE call is complete. 11791da177e4SLinus Torvalds */ 118013602896SFred Isaman void nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data) 11811da177e4SLinus Torvalds { 11821da177e4SLinus Torvalds struct nfs_writeargs *argp = &data->args; 11831da177e4SLinus Torvalds struct nfs_writeres *resp = &data->res; 1184eedc020eSAndy Adamson struct nfs_server *server = NFS_SERVER(data->inode); 1185788e7a89STrond Myklebust int status; 11861da177e4SLinus Torvalds 1187a3f565b1SChuck Lever dprintk("NFS: %5u nfs_writeback_done (status %d)\n", 11881da177e4SLinus Torvalds task->tk_pid, task->tk_status); 11891da177e4SLinus Torvalds 1190f551e44fSChuck Lever /* 1191f551e44fSChuck Lever * ->write_done will attempt to use post-op attributes to detect 1192f551e44fSChuck Lever * conflicting writes by other clients. A strict interpretation 1193f551e44fSChuck Lever * of close-to-open would allow us to continue caching even if 1194f551e44fSChuck Lever * another writer had changed the file, but some applications 1195f551e44fSChuck Lever * depend on tighter cache coherency when writing. 1196f551e44fSChuck Lever */ 1197788e7a89STrond Myklebust status = NFS_PROTO(data->inode)->write_done(task, data); 1198788e7a89STrond Myklebust if (status != 0) 119913602896SFred Isaman return; 120091d5b470SChuck Lever nfs_add_stats(data->inode, NFSIOS_SERVERWRITTENBYTES, resp->count); 120191d5b470SChuck Lever 12021da177e4SLinus Torvalds #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) 12031da177e4SLinus Torvalds if (resp->verf->committed < argp->stable && task->tk_status >= 0) { 12041da177e4SLinus Torvalds /* We tried a write call, but the server did not 12051da177e4SLinus Torvalds * commit data to stable storage even though we 12061da177e4SLinus Torvalds * requested it. 12071da177e4SLinus Torvalds * Note: There is a known bug in Tru64 < 5.0 in which 12081da177e4SLinus Torvalds * the server reports NFS_DATA_SYNC, but performs 12091da177e4SLinus Torvalds * NFS_FILE_SYNC. We therefore implement this checking 12101da177e4SLinus Torvalds * as a dprintk() in order to avoid filling syslog. 12111da177e4SLinus Torvalds */ 12121da177e4SLinus Torvalds static unsigned long complain; 12131da177e4SLinus Torvalds 1214a69aef14SFred Isaman /* Note this will print the MDS for a DS write */ 12151da177e4SLinus Torvalds if (time_before(complain, jiffies)) { 12161da177e4SLinus Torvalds dprintk("NFS: faulty NFS server %s:" 12171da177e4SLinus Torvalds " (committed = %d) != (stable = %d)\n", 1218eedc020eSAndy Adamson server->nfs_client->cl_hostname, 12191da177e4SLinus Torvalds resp->verf->committed, argp->stable); 12201da177e4SLinus Torvalds complain = jiffies + 300 * HZ; 12211da177e4SLinus Torvalds } 12221da177e4SLinus Torvalds } 12231da177e4SLinus Torvalds #endif 12241da177e4SLinus Torvalds /* Is this a short write? */ 12251da177e4SLinus Torvalds if (task->tk_status >= 0 && resp->count < argp->count) { 12261da177e4SLinus Torvalds static unsigned long complain; 12271da177e4SLinus Torvalds 122891d5b470SChuck Lever nfs_inc_stats(data->inode, NFSIOS_SHORTWRITE); 122991d5b470SChuck Lever 12301da177e4SLinus Torvalds /* Has the server at least made some progress? */ 12311da177e4SLinus Torvalds if (resp->count != 0) { 12321da177e4SLinus Torvalds /* Was this an NFSv2 write or an NFSv3 stable write? */ 12331da177e4SLinus Torvalds if (resp->verf->committed != NFS_UNSTABLE) { 12341da177e4SLinus Torvalds /* Resend from where the server left off */ 1235a69aef14SFred Isaman data->mds_offset += resp->count; 12361da177e4SLinus Torvalds argp->offset += resp->count; 12371da177e4SLinus Torvalds argp->pgbase += resp->count; 12381da177e4SLinus Torvalds argp->count -= resp->count; 12391da177e4SLinus Torvalds } else { 12401da177e4SLinus Torvalds /* Resend as a stable write in order to avoid 12411da177e4SLinus Torvalds * headaches in the case of a server crash. 12421da177e4SLinus Torvalds */ 12431da177e4SLinus Torvalds argp->stable = NFS_FILE_SYNC; 12441da177e4SLinus Torvalds } 12450110ee15STrond Myklebust nfs_restart_rpc(task, server->nfs_client); 124613602896SFred Isaman return; 12471da177e4SLinus Torvalds } 12481da177e4SLinus Torvalds if (time_before(complain, jiffies)) { 12491da177e4SLinus Torvalds printk(KERN_WARNING 12501da177e4SLinus Torvalds "NFS: Server wrote zero bytes, expected %u.\n", 12511da177e4SLinus Torvalds argp->count); 12521da177e4SLinus Torvalds complain = jiffies + 300 * HZ; 12531da177e4SLinus Torvalds } 12541da177e4SLinus Torvalds /* Can't do anything about it except throw an error. */ 12551da177e4SLinus Torvalds task->tk_status = -EIO; 12561da177e4SLinus Torvalds } 125713602896SFred Isaman return; 12581da177e4SLinus Torvalds } 12591da177e4SLinus Torvalds 12601da177e4SLinus Torvalds 12611da177e4SLinus Torvalds #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) 126271d0a611STrond Myklebust static int nfs_commit_set_lock(struct nfs_inode *nfsi, int may_wait) 126371d0a611STrond Myklebust { 1264*b8413f98STrond Myklebust int ret; 1265*b8413f98STrond Myklebust 126671d0a611STrond Myklebust if (!test_and_set_bit(NFS_INO_COMMIT, &nfsi->flags)) 126771d0a611STrond Myklebust return 1; 1268*b8413f98STrond Myklebust if (!may_wait) 126971d0a611STrond Myklebust return 0; 1270*b8413f98STrond Myklebust ret = out_of_line_wait_on_bit_lock(&nfsi->flags, 1271*b8413f98STrond Myklebust NFS_INO_COMMIT, 1272*b8413f98STrond Myklebust nfs_wait_bit_killable, 1273*b8413f98STrond Myklebust TASK_KILLABLE); 1274*b8413f98STrond Myklebust return (ret < 0) ? ret : 1; 127571d0a611STrond Myklebust } 127671d0a611STrond Myklebust 127771d0a611STrond Myklebust static void nfs_commit_clear_lock(struct nfs_inode *nfsi) 127871d0a611STrond Myklebust { 127971d0a611STrond Myklebust clear_bit(NFS_INO_COMMIT, &nfsi->flags); 128071d0a611STrond Myklebust smp_mb__after_clear_bit(); 128171d0a611STrond Myklebust wake_up_bit(&nfsi->flags, NFS_INO_COMMIT); 128271d0a611STrond Myklebust } 128371d0a611STrond Myklebust 128471d0a611STrond Myklebust 12850aa05887SH Hartley Sweeten static void nfs_commitdata_release(void *data) 12861da177e4SLinus Torvalds { 1287383ba719STrond Myklebust struct nfs_write_data *wdata = data; 1288383ba719STrond Myklebust 1289383ba719STrond Myklebust put_nfs_open_context(wdata->args.context); 12901da177e4SLinus Torvalds nfs_commit_free(wdata); 12911da177e4SLinus Torvalds } 12921da177e4SLinus Torvalds 12931da177e4SLinus Torvalds /* 12941da177e4SLinus Torvalds * Set up the argument/result storage required for the RPC call. 12951da177e4SLinus Torvalds */ 1296dbae4c73STrond Myklebust static int nfs_commit_rpcsetup(struct list_head *head, 1297788e7a89STrond Myklebust struct nfs_write_data *data, 1298788e7a89STrond Myklebust int how) 12991da177e4SLinus Torvalds { 130084115e1cSTrond Myklebust struct nfs_page *first = nfs_list_entry(head->next); 130184115e1cSTrond Myklebust struct inode *inode = first->wb_context->path.dentry->d_inode; 13023ff7576dSTrond Myklebust int priority = flush_task_priority(how); 130307737691STrond Myklebust struct rpc_task *task; 1304bdc7f021STrond Myklebust struct rpc_message msg = { 1305bdc7f021STrond Myklebust .rpc_argp = &data->args, 1306bdc7f021STrond Myklebust .rpc_resp = &data->res, 1307bdc7f021STrond Myklebust .rpc_cred = first->wb_context->cred, 1308bdc7f021STrond Myklebust }; 130984115e1cSTrond Myklebust struct rpc_task_setup task_setup_data = { 131007737691STrond Myklebust .task = &data->task, 131184115e1cSTrond Myklebust .rpc_client = NFS_CLIENT(inode), 1312bdc7f021STrond Myklebust .rpc_message = &msg, 131384115e1cSTrond Myklebust .callback_ops = &nfs_commit_ops, 131484115e1cSTrond Myklebust .callback_data = data, 1315101070caSTrond Myklebust .workqueue = nfsiod_workqueue, 13162c61be0aSTrond Myklebust .flags = RPC_TASK_ASYNC, 13173ff7576dSTrond Myklebust .priority = priority, 131884115e1cSTrond Myklebust }; 13191da177e4SLinus Torvalds 13201da177e4SLinus Torvalds /* Set up the RPC argument and reply structs 13211da177e4SLinus Torvalds * NB: take care not to mess about with data->commit et al. */ 13221da177e4SLinus Torvalds 13231da177e4SLinus Torvalds list_splice_init(head, &data->pages); 13241da177e4SLinus Torvalds 13251da177e4SLinus Torvalds data->inode = inode; 1326bdc7f021STrond Myklebust data->cred = msg.rpc_cred; 13271da177e4SLinus Torvalds 13281da177e4SLinus Torvalds data->args.fh = NFS_FH(data->inode); 13293da28eb1STrond Myklebust /* Note: we always request a commit of the entire inode */ 13303da28eb1STrond Myklebust data->args.offset = 0; 13313da28eb1STrond Myklebust data->args.count = 0; 1332383ba719STrond Myklebust data->args.context = get_nfs_open_context(first->wb_context); 13333da28eb1STrond Myklebust data->res.count = 0; 13341da177e4SLinus Torvalds data->res.fattr = &data->fattr; 13351da177e4SLinus Torvalds data->res.verf = &data->verf; 13360e574af1STrond Myklebust nfs_fattr_init(&data->fattr); 13371da177e4SLinus Torvalds 1338788e7a89STrond Myklebust /* Set up the initial task struct. */ 1339bdc7f021STrond Myklebust NFS_PROTO(inode)->commit_setup(data, &msg); 13401da177e4SLinus Torvalds 1341a3f565b1SChuck Lever dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid); 1342bdc7f021STrond Myklebust 134307737691STrond Myklebust task = rpc_run_task(&task_setup_data); 1344dbae4c73STrond Myklebust if (IS_ERR(task)) 1345dbae4c73STrond Myklebust return PTR_ERR(task); 1346d2224e7aSJeff Layton if (how & FLUSH_SYNC) 1347d2224e7aSJeff Layton rpc_wait_for_completion_task(task); 134807737691STrond Myklebust rpc_put_task(task); 1349dbae4c73STrond Myklebust return 0; 13501da177e4SLinus Torvalds } 13511da177e4SLinus Torvalds 13521da177e4SLinus Torvalds /* 13531da177e4SLinus Torvalds * Commit dirty pages 13541da177e4SLinus Torvalds */ 13551da177e4SLinus Torvalds static int 135640859d7eSChuck Lever nfs_commit_list(struct inode *inode, struct list_head *head, int how) 13571da177e4SLinus Torvalds { 13581da177e4SLinus Torvalds struct nfs_write_data *data; 13591da177e4SLinus Torvalds struct nfs_page *req; 13601da177e4SLinus Torvalds 1361c9d8f89dSTrond Myklebust data = nfs_commitdata_alloc(); 13621da177e4SLinus Torvalds 13631da177e4SLinus Torvalds if (!data) 13641da177e4SLinus Torvalds goto out_bad; 13651da177e4SLinus Torvalds 13661da177e4SLinus Torvalds /* Set up the argument struct */ 1367dbae4c73STrond Myklebust return nfs_commit_rpcsetup(head, data, how); 13681da177e4SLinus Torvalds out_bad: 13691da177e4SLinus Torvalds while (!list_empty(head)) { 13701da177e4SLinus Torvalds req = nfs_list_entry(head->next); 13711da177e4SLinus Torvalds nfs_list_remove_request(req); 13721da177e4SLinus Torvalds nfs_mark_request_commit(req); 137383715ad5STrond Myklebust dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); 1374c9e51e41SPeter Zijlstra dec_bdi_stat(req->wb_page->mapping->backing_dev_info, 1375c9e51e41SPeter Zijlstra BDI_RECLAIMABLE); 13769fd367f0STrond Myklebust nfs_clear_page_tag_locked(req); 13771da177e4SLinus Torvalds } 137871d0a611STrond Myklebust nfs_commit_clear_lock(NFS_I(inode)); 13791da177e4SLinus Torvalds return -ENOMEM; 13801da177e4SLinus Torvalds } 13811da177e4SLinus Torvalds 13821da177e4SLinus Torvalds /* 13831da177e4SLinus Torvalds * COMMIT call returned 13841da177e4SLinus Torvalds */ 1385788e7a89STrond Myklebust static void nfs_commit_done(struct rpc_task *task, void *calldata) 13861da177e4SLinus Torvalds { 1387963d8fe5STrond Myklebust struct nfs_write_data *data = calldata; 13881da177e4SLinus Torvalds 1389a3f565b1SChuck Lever dprintk("NFS: %5u nfs_commit_done (status %d)\n", 13901da177e4SLinus Torvalds task->tk_pid, task->tk_status); 13911da177e4SLinus Torvalds 1392788e7a89STrond Myklebust /* Call the NFS version-specific code */ 1393788e7a89STrond Myklebust if (NFS_PROTO(data->inode)->commit_done(task, data) != 0) 1394788e7a89STrond Myklebust return; 1395c9d8f89dSTrond Myklebust } 1396c9d8f89dSTrond Myklebust 1397c9d8f89dSTrond Myklebust static void nfs_commit_release(void *calldata) 1398c9d8f89dSTrond Myklebust { 1399c9d8f89dSTrond Myklebust struct nfs_write_data *data = calldata; 1400c9d8f89dSTrond Myklebust struct nfs_page *req; 1401c9d8f89dSTrond Myklebust int status = data->task.tk_status; 1402788e7a89STrond Myklebust 14031da177e4SLinus Torvalds while (!list_empty(&data->pages)) { 14041da177e4SLinus Torvalds req = nfs_list_entry(data->pages.next); 14051da177e4SLinus Torvalds nfs_list_remove_request(req); 1406e468bae9STrond Myklebust nfs_clear_request_commit(req); 14071da177e4SLinus Torvalds 140848186c7dSChuck Lever dprintk("NFS: commit (%s/%lld %d@%lld)", 140988be9f99STrond Myklebust req->wb_context->path.dentry->d_inode->i_sb->s_id, 141088be9f99STrond Myklebust (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), 14111da177e4SLinus Torvalds req->wb_bytes, 14121da177e4SLinus Torvalds (long long)req_offset(req)); 1413c9d8f89dSTrond Myklebust if (status < 0) { 1414c9d8f89dSTrond Myklebust nfs_context_set_write_error(req->wb_context, status); 14151da177e4SLinus Torvalds nfs_inode_remove_request(req); 1416c9d8f89dSTrond Myklebust dprintk(", error = %d\n", status); 14171da177e4SLinus Torvalds goto next; 14181da177e4SLinus Torvalds } 14191da177e4SLinus Torvalds 14201da177e4SLinus Torvalds /* Okay, COMMIT succeeded, apparently. Check the verifier 14211da177e4SLinus Torvalds * returned by the server against all stored verfs. */ 14221da177e4SLinus Torvalds if (!memcmp(req->wb_verf.verifier, data->verf.verifier, sizeof(data->verf.verifier))) { 14231da177e4SLinus Torvalds /* We have a match */ 14241da177e4SLinus Torvalds nfs_inode_remove_request(req); 14251da177e4SLinus Torvalds dprintk(" OK\n"); 14261da177e4SLinus Torvalds goto next; 14271da177e4SLinus Torvalds } 14281da177e4SLinus Torvalds /* We have a mismatch. Write the page again */ 14291da177e4SLinus Torvalds dprintk(" mismatch\n"); 14306d884e8fSFred nfs_mark_request_dirty(req); 14311da177e4SLinus Torvalds next: 14329fd367f0STrond Myklebust nfs_clear_page_tag_locked(req); 14331da177e4SLinus Torvalds } 143471d0a611STrond Myklebust nfs_commit_clear_lock(NFS_I(data->inode)); 1435c9d8f89dSTrond Myklebust nfs_commitdata_release(calldata); 14361da177e4SLinus Torvalds } 1437788e7a89STrond Myklebust 1438788e7a89STrond Myklebust static const struct rpc_call_ops nfs_commit_ops = { 143921d9a851SAndy Adamson #if defined(CONFIG_NFS_V4_1) 144021d9a851SAndy Adamson .rpc_call_prepare = nfs_write_prepare, 144121d9a851SAndy Adamson #endif /* CONFIG_NFS_V4_1 */ 1442788e7a89STrond Myklebust .rpc_call_done = nfs_commit_done, 1443788e7a89STrond Myklebust .rpc_release = nfs_commit_release, 1444788e7a89STrond Myklebust }; 14451da177e4SLinus Torvalds 1446b608b283STrond Myklebust int nfs_commit_inode(struct inode *inode, int how) 14471da177e4SLinus Torvalds { 14481da177e4SLinus Torvalds LIST_HEAD(head); 144971d0a611STrond Myklebust int may_wait = how & FLUSH_SYNC; 1450*b8413f98STrond Myklebust int res; 14511da177e4SLinus Torvalds 1452*b8413f98STrond Myklebust res = nfs_commit_set_lock(NFS_I(inode), may_wait); 1453*b8413f98STrond Myklebust if (res <= 0) 1454c5efa5fcSTrond Myklebust goto out_mark_dirty; 1455587142f8STrond Myklebust spin_lock(&inode->i_lock); 14563da28eb1STrond Myklebust res = nfs_scan_commit(inode, &head, 0, 0); 1457587142f8STrond Myklebust spin_unlock(&inode->i_lock); 14581da177e4SLinus Torvalds if (res) { 14597d46a49fSTrond Myklebust int error = nfs_commit_list(inode, &head, how); 14601da177e4SLinus Torvalds if (error < 0) 14611da177e4SLinus Torvalds return error; 1462*b8413f98STrond Myklebust if (!may_wait) 1463*b8413f98STrond Myklebust goto out_mark_dirty; 1464*b8413f98STrond Myklebust error = wait_on_bit(&NFS_I(inode)->flags, 1465*b8413f98STrond Myklebust NFS_INO_COMMIT, 146671d0a611STrond Myklebust nfs_wait_bit_killable, 146771d0a611STrond Myklebust TASK_KILLABLE); 1468*b8413f98STrond Myklebust if (error < 0) 1469*b8413f98STrond Myklebust return error; 147071d0a611STrond Myklebust } else 147171d0a611STrond Myklebust nfs_commit_clear_lock(NFS_I(inode)); 1472c5efa5fcSTrond Myklebust return res; 1473c5efa5fcSTrond Myklebust /* Note: If we exit without ensuring that the commit is complete, 1474c5efa5fcSTrond Myklebust * we must mark the inode as dirty. Otherwise, future calls to 1475c5efa5fcSTrond Myklebust * sync_inode() with the WB_SYNC_ALL flag set will fail to ensure 1476c5efa5fcSTrond Myklebust * that the data is on the disk. 1477c5efa5fcSTrond Myklebust */ 1478c5efa5fcSTrond Myklebust out_mark_dirty: 1479c5efa5fcSTrond Myklebust __mark_inode_dirty(inode, I_DIRTY_DATASYNC); 14801da177e4SLinus Torvalds return res; 14811da177e4SLinus Torvalds } 14828fc795f7STrond Myklebust 14838fc795f7STrond Myklebust static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_control *wbc) 14848fc795f7STrond Myklebust { 1485420e3646STrond Myklebust struct nfs_inode *nfsi = NFS_I(inode); 1486420e3646STrond Myklebust int flags = FLUSH_SYNC; 1487420e3646STrond Myklebust int ret = 0; 14888fc795f7STrond Myklebust 1489a00dd6c0SJeff Layton if (wbc->sync_mode == WB_SYNC_NONE) { 1490a00dd6c0SJeff Layton /* Don't commit yet if this is a non-blocking flush and there 1491a00dd6c0SJeff Layton * are a lot of outstanding writes for this mapping. 1492420e3646STrond Myklebust */ 1493a00dd6c0SJeff Layton if (nfsi->ncommit <= (nfsi->npages >> 1)) 1494420e3646STrond Myklebust goto out_mark_dirty; 1495420e3646STrond Myklebust 1496a00dd6c0SJeff Layton /* don't wait for the COMMIT response */ 1497420e3646STrond Myklebust flags = 0; 1498a00dd6c0SJeff Layton } 1499a00dd6c0SJeff Layton 1500420e3646STrond Myklebust ret = nfs_commit_inode(inode, flags); 1501420e3646STrond Myklebust if (ret >= 0) { 1502420e3646STrond Myklebust if (wbc->sync_mode == WB_SYNC_NONE) { 1503420e3646STrond Myklebust if (ret < wbc->nr_to_write) 1504420e3646STrond Myklebust wbc->nr_to_write -= ret; 1505420e3646STrond Myklebust else 1506420e3646STrond Myklebust wbc->nr_to_write = 0; 1507420e3646STrond Myklebust } 15088fc795f7STrond Myklebust return 0; 1509420e3646STrond Myklebust } 1510420e3646STrond Myklebust out_mark_dirty: 15118fc795f7STrond Myklebust __mark_inode_dirty(inode, I_DIRTY_DATASYNC); 15128fc795f7STrond Myklebust return ret; 15138fc795f7STrond Myklebust } 1514c63c7b05STrond Myklebust #else 15158fc795f7STrond Myklebust static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_control *wbc) 15168fc795f7STrond Myklebust { 15178fc795f7STrond Myklebust return 0; 15188fc795f7STrond Myklebust } 15191da177e4SLinus Torvalds #endif 15201da177e4SLinus Torvalds 15218fc795f7STrond Myklebust int nfs_write_inode(struct inode *inode, struct writeback_control *wbc) 15228fc795f7STrond Myklebust { 15238fc795f7STrond Myklebust return nfs_commit_unstable_pages(inode, wbc); 15248fc795f7STrond Myklebust } 15258fc795f7STrond Myklebust 1526acdc53b2STrond Myklebust /* 1527acdc53b2STrond Myklebust * flush the inode to disk. 1528acdc53b2STrond Myklebust */ 1529acdc53b2STrond Myklebust int nfs_wb_all(struct inode *inode) 153034901f70STrond Myklebust { 153134901f70STrond Myklebust struct writeback_control wbc = { 153272cb77f4STrond Myklebust .sync_mode = WB_SYNC_ALL, 153334901f70STrond Myklebust .nr_to_write = LONG_MAX, 1534d7fb1207STrond Myklebust .range_start = 0, 1535d7fb1207STrond Myklebust .range_end = LLONG_MAX, 153634901f70STrond Myklebust }; 153734901f70STrond Myklebust 1538acdc53b2STrond Myklebust return sync_inode(inode, &wbc); 15391c75950bSTrond Myklebust } 15401c75950bSTrond Myklebust 15411b3b4a1aSTrond Myklebust int nfs_wb_page_cancel(struct inode *inode, struct page *page) 15421b3b4a1aSTrond Myklebust { 15431b3b4a1aSTrond Myklebust struct nfs_page *req; 15441b3b4a1aSTrond Myklebust int ret = 0; 15451b3b4a1aSTrond Myklebust 15461b3b4a1aSTrond Myklebust BUG_ON(!PageLocked(page)); 15471b3b4a1aSTrond Myklebust for (;;) { 1548ba8b06e6STrond Myklebust wait_on_page_writeback(page); 15491b3b4a1aSTrond Myklebust req = nfs_page_find_request(page); 15501b3b4a1aSTrond Myklebust if (req == NULL) 15511b3b4a1aSTrond Myklebust break; 15521b3b4a1aSTrond Myklebust if (nfs_lock_request_dontget(req)) { 15531b3b4a1aSTrond Myklebust nfs_inode_remove_request(req); 15541b3b4a1aSTrond Myklebust /* 15551b3b4a1aSTrond Myklebust * In case nfs_inode_remove_request has marked the 15561b3b4a1aSTrond Myklebust * page as being dirty 15571b3b4a1aSTrond Myklebust */ 15581b3b4a1aSTrond Myklebust cancel_dirty_page(page, PAGE_CACHE_SIZE); 15591b3b4a1aSTrond Myklebust nfs_unlock_request(req); 15601b3b4a1aSTrond Myklebust break; 15611b3b4a1aSTrond Myklebust } 15621b3b4a1aSTrond Myklebust ret = nfs_wait_on_request(req); 1563c9edda71STrond Myklebust nfs_release_request(req); 15641b3b4a1aSTrond Myklebust if (ret < 0) 1565c988950eSTrond Myklebust break; 15661b3b4a1aSTrond Myklebust } 15671b3b4a1aSTrond Myklebust return ret; 15681b3b4a1aSTrond Myklebust } 15691b3b4a1aSTrond Myklebust 15701c75950bSTrond Myklebust /* 15711c75950bSTrond Myklebust * Write back all requests on one page - we do this before reading it. 15721c75950bSTrond Myklebust */ 15731c75950bSTrond Myklebust int nfs_wb_page(struct inode *inode, struct page *page) 15741c75950bSTrond Myklebust { 15757f2f12d9STrond Myklebust loff_t range_start = page_offset(page); 15767f2f12d9STrond Myklebust loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); 15777f2f12d9STrond Myklebust struct writeback_control wbc = { 15787f2f12d9STrond Myklebust .sync_mode = WB_SYNC_ALL, 15797f2f12d9STrond Myklebust .nr_to_write = 0, 15807f2f12d9STrond Myklebust .range_start = range_start, 15817f2f12d9STrond Myklebust .range_end = range_end, 15827f2f12d9STrond Myklebust }; 15837f2f12d9STrond Myklebust int ret; 15847f2f12d9STrond Myklebust 15850522f6adSTrond Myklebust for (;;) { 1586ba8b06e6STrond Myklebust wait_on_page_writeback(page); 15877f2f12d9STrond Myklebust if (clear_page_dirty_for_io(page)) { 15887f2f12d9STrond Myklebust ret = nfs_writepage_locked(page, &wbc); 15897f2f12d9STrond Myklebust if (ret < 0) 15907f2f12d9STrond Myklebust goto out_error; 15910522f6adSTrond Myklebust continue; 15927f2f12d9STrond Myklebust } 15930522f6adSTrond Myklebust if (!PagePrivate(page)) 15940522f6adSTrond Myklebust break; 15950522f6adSTrond Myklebust ret = nfs_commit_inode(inode, FLUSH_SYNC); 15967f2f12d9STrond Myklebust if (ret < 0) 15977f2f12d9STrond Myklebust goto out_error; 15987f2f12d9STrond Myklebust } 15997f2f12d9STrond Myklebust return 0; 16007f2f12d9STrond Myklebust out_error: 16017f2f12d9STrond Myklebust return ret; 16021c75950bSTrond Myklebust } 16031c75950bSTrond Myklebust 1604074cc1deSTrond Myklebust #ifdef CONFIG_MIGRATION 1605074cc1deSTrond Myklebust int nfs_migrate_page(struct address_space *mapping, struct page *newpage, 1606074cc1deSTrond Myklebust struct page *page) 1607074cc1deSTrond Myklebust { 1608074cc1deSTrond Myklebust struct nfs_page *req; 1609074cc1deSTrond Myklebust int ret; 1610074cc1deSTrond Myklebust 1611074cc1deSTrond Myklebust nfs_fscache_release_page(page, GFP_KERNEL); 1612074cc1deSTrond Myklebust 1613cfb506e1STrond Myklebust req = nfs_find_and_lock_request(page, false); 1614074cc1deSTrond Myklebust ret = PTR_ERR(req); 1615074cc1deSTrond Myklebust if (IS_ERR(req)) 1616074cc1deSTrond Myklebust goto out; 1617074cc1deSTrond Myklebust 1618074cc1deSTrond Myklebust ret = migrate_page(mapping, newpage, page); 1619074cc1deSTrond Myklebust if (!req) 1620074cc1deSTrond Myklebust goto out; 1621074cc1deSTrond Myklebust if (ret) 1622074cc1deSTrond Myklebust goto out_unlock; 1623074cc1deSTrond Myklebust page_cache_get(newpage); 1624190f38e5STrond Myklebust spin_lock(&mapping->host->i_lock); 1625074cc1deSTrond Myklebust req->wb_page = newpage; 1626074cc1deSTrond Myklebust SetPagePrivate(newpage); 1627190f38e5STrond Myklebust set_page_private(newpage, (unsigned long)req); 1628074cc1deSTrond Myklebust ClearPagePrivate(page); 1629074cc1deSTrond Myklebust set_page_private(page, 0); 1630190f38e5STrond Myklebust spin_unlock(&mapping->host->i_lock); 1631074cc1deSTrond Myklebust page_cache_release(page); 1632074cc1deSTrond Myklebust out_unlock: 1633074cc1deSTrond Myklebust nfs_clear_page_tag_locked(req); 1634074cc1deSTrond Myklebust out: 1635074cc1deSTrond Myklebust return ret; 1636074cc1deSTrond Myklebust } 1637074cc1deSTrond Myklebust #endif 1638074cc1deSTrond Myklebust 1639f7b422b1SDavid Howells int __init nfs_init_writepagecache(void) 16401da177e4SLinus Torvalds { 16411da177e4SLinus Torvalds nfs_wdata_cachep = kmem_cache_create("nfs_write_data", 16421da177e4SLinus Torvalds sizeof(struct nfs_write_data), 16431da177e4SLinus Torvalds 0, SLAB_HWCACHE_ALIGN, 164420c2df83SPaul Mundt NULL); 16451da177e4SLinus Torvalds if (nfs_wdata_cachep == NULL) 16461da177e4SLinus Torvalds return -ENOMEM; 16471da177e4SLinus Torvalds 164893d2341cSMatthew Dobson nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE, 16491da177e4SLinus Torvalds nfs_wdata_cachep); 16501da177e4SLinus Torvalds if (nfs_wdata_mempool == NULL) 16511da177e4SLinus Torvalds return -ENOMEM; 16521da177e4SLinus Torvalds 165393d2341cSMatthew Dobson nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT, 16541da177e4SLinus Torvalds nfs_wdata_cachep); 16551da177e4SLinus Torvalds if (nfs_commit_mempool == NULL) 16561da177e4SLinus Torvalds return -ENOMEM; 16571da177e4SLinus Torvalds 165889a09141SPeter Zijlstra /* 165989a09141SPeter Zijlstra * NFS congestion size, scale with available memory. 166089a09141SPeter Zijlstra * 166189a09141SPeter Zijlstra * 64MB: 8192k 166289a09141SPeter Zijlstra * 128MB: 11585k 166389a09141SPeter Zijlstra * 256MB: 16384k 166489a09141SPeter Zijlstra * 512MB: 23170k 166589a09141SPeter Zijlstra * 1GB: 32768k 166689a09141SPeter Zijlstra * 2GB: 46340k 166789a09141SPeter Zijlstra * 4GB: 65536k 166889a09141SPeter Zijlstra * 8GB: 92681k 166989a09141SPeter Zijlstra * 16GB: 131072k 167089a09141SPeter Zijlstra * 167189a09141SPeter Zijlstra * This allows larger machines to have larger/more transfers. 167289a09141SPeter Zijlstra * Limit the default to 256M 167389a09141SPeter Zijlstra */ 167489a09141SPeter Zijlstra nfs_congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); 167589a09141SPeter Zijlstra if (nfs_congestion_kb > 256*1024) 167689a09141SPeter Zijlstra nfs_congestion_kb = 256*1024; 167789a09141SPeter Zijlstra 16781da177e4SLinus Torvalds return 0; 16791da177e4SLinus Torvalds } 16801da177e4SLinus Torvalds 1681266bee88SDavid Brownell void nfs_destroy_writepagecache(void) 16821da177e4SLinus Torvalds { 16831da177e4SLinus Torvalds mempool_destroy(nfs_commit_mempool); 16841da177e4SLinus Torvalds mempool_destroy(nfs_wdata_mempool); 16851a1d92c1SAlexey Dobriyan kmem_cache_destroy(nfs_wdata_cachep); 16861da177e4SLinus Torvalds } 16871da177e4SLinus Torvalds 1688