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> 23afeacc8cSPaul Gortmaker #include <linux/export.h> 243fcfab16SAndrew Morton 251da177e4SLinus Torvalds #include <asm/uaccess.h> 261da177e4SLinus Torvalds 271da177e4SLinus Torvalds #include "delegation.h" 2849a70f27STrond Myklebust #include "internal.h" 2991d5b470SChuck Lever #include "iostat.h" 30def6ed7eSAndy Adamson #include "nfs4_fs.h" 31074cc1deSTrond Myklebust #include "fscache.h" 3294ad1c80SFred Isaman #include "pnfs.h" 331da177e4SLinus Torvalds 341da177e4SLinus Torvalds #define NFSDBG_FACILITY NFSDBG_PAGECACHE 351da177e4SLinus Torvalds 361da177e4SLinus Torvalds #define MIN_POOL_WRITE (32) 371da177e4SLinus Torvalds #define MIN_POOL_COMMIT (4) 381da177e4SLinus Torvalds 391da177e4SLinus Torvalds /* 401da177e4SLinus Torvalds * Local function declarations 411da177e4SLinus Torvalds */ 42f8512ad0SFred Isaman static void nfs_redirty_request(struct nfs_page *req); 436c75dc0dSFred Isaman static const struct rpc_call_ops nfs_write_common_ops; 44788e7a89STrond Myklebust static const struct rpc_call_ops nfs_commit_ops; 45061ae2edSFred Isaman static const struct nfs_pgio_completion_ops nfs_async_write_completion_ops; 46f453a54aSFred Isaman static const struct nfs_commit_completion_ops nfs_commit_completion_ops; 471da177e4SLinus Torvalds 48e18b890bSChristoph Lameter static struct kmem_cache *nfs_wdata_cachep; 493feb2d49STrond Myklebust static mempool_t *nfs_wdata_mempool; 500b7c0153SFred Isaman static struct kmem_cache *nfs_cdata_cachep; 511da177e4SLinus Torvalds static mempool_t *nfs_commit_mempool; 521da177e4SLinus Torvalds 530b7c0153SFred Isaman struct nfs_commit_data *nfs_commitdata_alloc(void) 541da177e4SLinus Torvalds { 55192e501bSMel Gorman struct nfs_commit_data *p = mempool_alloc(nfs_commit_mempool, GFP_NOIO); 5640859d7eSChuck Lever 571da177e4SLinus Torvalds if (p) { 581da177e4SLinus Torvalds memset(p, 0, sizeof(*p)); 591da177e4SLinus Torvalds INIT_LIST_HEAD(&p->pages); 601da177e4SLinus Torvalds } 611da177e4SLinus Torvalds return p; 621da177e4SLinus Torvalds } 63e0c2b380SFred Isaman EXPORT_SYMBOL_GPL(nfs_commitdata_alloc); 641da177e4SLinus Torvalds 650b7c0153SFred Isaman void nfs_commit_free(struct nfs_commit_data *p) 661da177e4SLinus Torvalds { 671da177e4SLinus Torvalds mempool_free(p, nfs_commit_mempool); 681da177e4SLinus Torvalds } 69e0c2b380SFred Isaman EXPORT_SYMBOL_GPL(nfs_commit_free); 701da177e4SLinus Torvalds 716c75dc0dSFred Isaman struct nfs_write_header *nfs_writehdr_alloc(void) 723feb2d49STrond Myklebust { 73192e501bSMel Gorman struct nfs_write_header *p = mempool_alloc(nfs_wdata_mempool, GFP_NOIO); 743feb2d49STrond Myklebust 753feb2d49STrond Myklebust if (p) { 76cd841605SFred Isaman struct nfs_pgio_header *hdr = &p->header; 77cd841605SFred Isaman 783feb2d49STrond Myklebust memset(p, 0, sizeof(*p)); 79cd841605SFred Isaman INIT_LIST_HEAD(&hdr->pages); 806c75dc0dSFred Isaman INIT_LIST_HEAD(&hdr->rpc_list); 816c75dc0dSFred Isaman spin_lock_init(&hdr->lock); 826c75dc0dSFred Isaman atomic_set(&hdr->refcnt, 0); 839bce008bSTrond Myklebust hdr->verf = &p->verf; 843feb2d49STrond Myklebust } 853feb2d49STrond Myklebust return p; 863feb2d49STrond Myklebust } 8789d77c8fSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_writehdr_alloc); 883feb2d49STrond Myklebust 891763da12SFred Isaman static struct nfs_write_data *nfs_writedata_alloc(struct nfs_pgio_header *hdr, 906c75dc0dSFred Isaman unsigned int pagecount) 916c75dc0dSFred Isaman { 926c75dc0dSFred Isaman struct nfs_write_data *data, *prealloc; 936c75dc0dSFred Isaman 946c75dc0dSFred Isaman prealloc = &container_of(hdr, struct nfs_write_header, header)->rpc_data; 956c75dc0dSFred Isaman if (prealloc->header == NULL) 966c75dc0dSFred Isaman data = prealloc; 976c75dc0dSFred Isaman else 986c75dc0dSFred Isaman data = kzalloc(sizeof(*data), GFP_KERNEL); 996c75dc0dSFred Isaman if (!data) 1006c75dc0dSFred Isaman goto out; 1016c75dc0dSFred Isaman 1026c75dc0dSFred Isaman if (nfs_pgarray_set(&data->pages, pagecount)) { 1036c75dc0dSFred Isaman data->header = hdr; 1046c75dc0dSFred Isaman atomic_inc(&hdr->refcnt); 1056c75dc0dSFred Isaman } else { 1066c75dc0dSFred Isaman if (data != prealloc) 1076c75dc0dSFred Isaman kfree(data); 1086c75dc0dSFred Isaman data = NULL; 1096c75dc0dSFred Isaman } 1106c75dc0dSFred Isaman out: 1116c75dc0dSFred Isaman return data; 1126c75dc0dSFred Isaman } 1136c75dc0dSFred Isaman 114cd841605SFred Isaman void nfs_writehdr_free(struct nfs_pgio_header *hdr) 1153feb2d49STrond Myklebust { 116cd841605SFred Isaman struct nfs_write_header *whdr = container_of(hdr, struct nfs_write_header, header); 117cd841605SFred Isaman mempool_free(whdr, nfs_wdata_mempool); 1183feb2d49STrond Myklebust } 11989d77c8fSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_writehdr_free); 1203feb2d49STrond Myklebust 121dce81290STrond Myklebust void nfs_writedata_release(struct nfs_write_data *wdata) 1221da177e4SLinus Torvalds { 1236c75dc0dSFred Isaman struct nfs_pgio_header *hdr = wdata->header; 1246c75dc0dSFred Isaman struct nfs_write_header *write_header = container_of(hdr, struct nfs_write_header, header); 1256c75dc0dSFred Isaman 126383ba719STrond Myklebust put_nfs_open_context(wdata->args.context); 12730dd374fSFred Isaman if (wdata->pages.pagevec != wdata->pages.page_array) 12830dd374fSFred Isaman kfree(wdata->pages.pagevec); 1296c75dc0dSFred Isaman if (wdata != &write_header->rpc_data) 1306c75dc0dSFred Isaman kfree(wdata); 1316c75dc0dSFred Isaman else 1326c75dc0dSFred Isaman wdata->header = NULL; 1336c75dc0dSFred Isaman if (atomic_dec_and_test(&hdr->refcnt)) 134061ae2edSFred Isaman hdr->completion_ops->completion(hdr); 1351da177e4SLinus Torvalds } 13689d77c8fSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_writedata_release); 1371da177e4SLinus Torvalds 1387b159fc1STrond Myklebust static void nfs_context_set_write_error(struct nfs_open_context *ctx, int error) 1397b159fc1STrond Myklebust { 1407b159fc1STrond Myklebust ctx->error = error; 1417b159fc1STrond Myklebust smp_wmb(); 1427b159fc1STrond Myklebust set_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); 1437b159fc1STrond Myklebust } 1447b159fc1STrond Myklebust 14529418aa4SMel Gorman static struct nfs_page * 14629418aa4SMel Gorman nfs_page_find_request_locked(struct nfs_inode *nfsi, struct page *page) 147277459d2STrond Myklebust { 148277459d2STrond Myklebust struct nfs_page *req = NULL; 149277459d2STrond Myklebust 15029418aa4SMel Gorman if (PagePrivate(page)) 151277459d2STrond Myklebust req = (struct nfs_page *)page_private(page); 15229418aa4SMel Gorman else if (unlikely(PageSwapCache(page))) { 15329418aa4SMel Gorman struct nfs_page *freq, *t; 15429418aa4SMel Gorman 15529418aa4SMel Gorman /* Linearly search the commit list for the correct req */ 15629418aa4SMel Gorman list_for_each_entry_safe(freq, t, &nfsi->commit_info.list, wb_list) { 15729418aa4SMel Gorman if (freq->wb_page == page) { 15829418aa4SMel Gorman req = freq; 15929418aa4SMel Gorman break; 160277459d2STrond Myklebust } 16129418aa4SMel Gorman } 16229418aa4SMel Gorman } 16329418aa4SMel Gorman 16429418aa4SMel Gorman if (req) 16529418aa4SMel Gorman kref_get(&req->wb_kref); 16629418aa4SMel Gorman 167277459d2STrond Myklebust return req; 168277459d2STrond Myklebust } 169277459d2STrond Myklebust 170277459d2STrond Myklebust static struct nfs_page *nfs_page_find_request(struct page *page) 171277459d2STrond Myklebust { 172d56b4ddfSMel Gorman struct inode *inode = page_file_mapping(page)->host; 173277459d2STrond Myklebust struct nfs_page *req = NULL; 174277459d2STrond Myklebust 175587142f8STrond Myklebust spin_lock(&inode->i_lock); 17629418aa4SMel Gorman req = nfs_page_find_request_locked(NFS_I(inode), page); 177587142f8STrond Myklebust spin_unlock(&inode->i_lock); 178277459d2STrond Myklebust return req; 179277459d2STrond Myklebust } 180277459d2STrond Myklebust 1811da177e4SLinus Torvalds /* Adjust the file length if we're writing beyond the end */ 1821da177e4SLinus Torvalds static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int count) 1831da177e4SLinus Torvalds { 184d56b4ddfSMel Gorman struct inode *inode = page_file_mapping(page)->host; 185a3d01454STrond Myklebust loff_t end, i_size; 186a3d01454STrond Myklebust pgoff_t end_index; 1871da177e4SLinus Torvalds 188a3d01454STrond Myklebust spin_lock(&inode->i_lock); 189a3d01454STrond Myklebust i_size = i_size_read(inode); 190a3d01454STrond Myklebust end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; 191d56b4ddfSMel Gorman if (i_size > 0 && page_file_index(page) < end_index) 192a3d01454STrond Myklebust goto out; 193d56b4ddfSMel Gorman end = page_file_offset(page) + ((loff_t)offset+count); 1941da177e4SLinus Torvalds if (i_size >= end) 195a3d01454STrond Myklebust goto out; 1961da177e4SLinus Torvalds i_size_write(inode, end); 197a3d01454STrond Myklebust nfs_inc_stats(inode, NFSIOS_EXTENDWRITE); 198a3d01454STrond Myklebust out: 199a3d01454STrond Myklebust spin_unlock(&inode->i_lock); 2001da177e4SLinus Torvalds } 2011da177e4SLinus Torvalds 202a301b777STrond Myklebust /* A writeback failed: mark the page as bad, and invalidate the page cache */ 203a301b777STrond Myklebust static void nfs_set_pageerror(struct page *page) 204a301b777STrond Myklebust { 205a301b777STrond Myklebust SetPageError(page); 206d56b4ddfSMel Gorman nfs_zap_mapping(page_file_mapping(page)->host, page_file_mapping(page)); 207a301b777STrond Myklebust } 208a301b777STrond Myklebust 2091da177e4SLinus Torvalds /* We can set the PG_uptodate flag if we see that a write request 2101da177e4SLinus Torvalds * covers the full page. 2111da177e4SLinus Torvalds */ 2121da177e4SLinus Torvalds static void nfs_mark_uptodate(struct page *page, unsigned int base, unsigned int count) 2131da177e4SLinus Torvalds { 2141da177e4SLinus Torvalds if (PageUptodate(page)) 2151da177e4SLinus Torvalds return; 2161da177e4SLinus Torvalds if (base != 0) 2171da177e4SLinus Torvalds return; 21849a70f27STrond Myklebust if (count != nfs_page_length(page)) 2191da177e4SLinus Torvalds return; 2201da177e4SLinus Torvalds SetPageUptodate(page); 2211da177e4SLinus Torvalds } 2221da177e4SLinus Torvalds 2231da177e4SLinus Torvalds static int wb_priority(struct writeback_control *wbc) 2241da177e4SLinus Torvalds { 2251da177e4SLinus Torvalds if (wbc->for_reclaim) 226c63c7b05STrond Myklebust return FLUSH_HIGHPRI | FLUSH_STABLE; 227b17621feSWu Fengguang if (wbc->for_kupdate || wbc->for_background) 228b31268acSTrond Myklebust return FLUSH_LOWPRI | FLUSH_COND_STABLE; 229b31268acSTrond Myklebust return FLUSH_COND_STABLE; 2301da177e4SLinus Torvalds } 2311da177e4SLinus Torvalds 2321da177e4SLinus Torvalds /* 23389a09141SPeter Zijlstra * NFS congestion control 23489a09141SPeter Zijlstra */ 23589a09141SPeter Zijlstra 23689a09141SPeter Zijlstra int nfs_congestion_kb; 23789a09141SPeter Zijlstra 23889a09141SPeter Zijlstra #define NFS_CONGESTION_ON_THRESH (nfs_congestion_kb >> (PAGE_SHIFT-10)) 23989a09141SPeter Zijlstra #define NFS_CONGESTION_OFF_THRESH \ 24089a09141SPeter Zijlstra (NFS_CONGESTION_ON_THRESH - (NFS_CONGESTION_ON_THRESH >> 2)) 24189a09141SPeter Zijlstra 2425a6d41b3STrond Myklebust static int nfs_set_page_writeback(struct page *page) 24389a09141SPeter Zijlstra { 2445a6d41b3STrond Myklebust int ret = test_set_page_writeback(page); 2455a6d41b3STrond Myklebust 2465a6d41b3STrond Myklebust if (!ret) { 247d56b4ddfSMel Gorman struct inode *inode = page_file_mapping(page)->host; 24889a09141SPeter Zijlstra struct nfs_server *nfss = NFS_SERVER(inode); 24989a09141SPeter Zijlstra 250277866a0SPeter Zijlstra if (atomic_long_inc_return(&nfss->writeback) > 2518aa7e847SJens Axboe NFS_CONGESTION_ON_THRESH) { 2528aa7e847SJens Axboe set_bdi_congested(&nfss->backing_dev_info, 2538aa7e847SJens Axboe BLK_RW_ASYNC); 2548aa7e847SJens Axboe } 25589a09141SPeter Zijlstra } 2565a6d41b3STrond Myklebust return ret; 25789a09141SPeter Zijlstra } 25889a09141SPeter Zijlstra 25989a09141SPeter Zijlstra static void nfs_end_page_writeback(struct page *page) 26089a09141SPeter Zijlstra { 261d56b4ddfSMel Gorman struct inode *inode = page_file_mapping(page)->host; 26289a09141SPeter Zijlstra struct nfs_server *nfss = NFS_SERVER(inode); 26389a09141SPeter Zijlstra 26489a09141SPeter Zijlstra end_page_writeback(page); 265c4dc4beeSPeter Zijlstra if (atomic_long_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH) 2668aa7e847SJens Axboe clear_bdi_congested(&nfss->backing_dev_info, BLK_RW_ASYNC); 26789a09141SPeter Zijlstra } 26889a09141SPeter Zijlstra 269cfb506e1STrond Myklebust static struct nfs_page *nfs_find_and_lock_request(struct page *page, bool nonblock) 270e261f51fSTrond Myklebust { 271d56b4ddfSMel Gorman struct inode *inode = page_file_mapping(page)->host; 272e261f51fSTrond Myklebust struct nfs_page *req; 273e261f51fSTrond Myklebust int ret; 274e261f51fSTrond Myklebust 275587142f8STrond Myklebust spin_lock(&inode->i_lock); 276e261f51fSTrond Myklebust for (;;) { 27729418aa4SMel Gorman req = nfs_page_find_request_locked(NFS_I(inode), page); 278074cc1deSTrond Myklebust if (req == NULL) 279074cc1deSTrond Myklebust break; 2807ad84aa9STrond Myklebust if (nfs_lock_request(req)) 281e261f51fSTrond Myklebust break; 282e261f51fSTrond Myklebust /* Note: If we hold the page lock, as is the case in nfs_writepage, 2837ad84aa9STrond Myklebust * then the call to nfs_lock_request() will always 284e261f51fSTrond Myklebust * succeed provided that someone hasn't already marked the 285e261f51fSTrond Myklebust * request as dirty (in which case we don't care). 286e261f51fSTrond Myklebust */ 287587142f8STrond Myklebust spin_unlock(&inode->i_lock); 288cfb506e1STrond Myklebust if (!nonblock) 289e261f51fSTrond Myklebust ret = nfs_wait_on_request(req); 290cfb506e1STrond Myklebust else 291cfb506e1STrond Myklebust ret = -EAGAIN; 292e261f51fSTrond Myklebust nfs_release_request(req); 293e261f51fSTrond Myklebust if (ret != 0) 294074cc1deSTrond Myklebust return ERR_PTR(ret); 295587142f8STrond Myklebust spin_lock(&inode->i_lock); 296e261f51fSTrond Myklebust } 297587142f8STrond Myklebust spin_unlock(&inode->i_lock); 298074cc1deSTrond Myklebust return req; 299612c9384STrond Myklebust } 300074cc1deSTrond Myklebust 301074cc1deSTrond Myklebust /* 302074cc1deSTrond Myklebust * Find an associated nfs write request, and prepare to flush it out 303074cc1deSTrond Myklebust * May return an error if the user signalled nfs_wait_on_request(). 304074cc1deSTrond Myklebust */ 305074cc1deSTrond Myklebust static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio, 306cfb506e1STrond Myklebust struct page *page, bool nonblock) 307074cc1deSTrond Myklebust { 308074cc1deSTrond Myklebust struct nfs_page *req; 309074cc1deSTrond Myklebust int ret = 0; 310074cc1deSTrond Myklebust 311cfb506e1STrond Myklebust req = nfs_find_and_lock_request(page, nonblock); 312074cc1deSTrond Myklebust if (!req) 313074cc1deSTrond Myklebust goto out; 314074cc1deSTrond Myklebust ret = PTR_ERR(req); 315074cc1deSTrond Myklebust if (IS_ERR(req)) 316074cc1deSTrond Myklebust goto out; 317074cc1deSTrond Myklebust 318074cc1deSTrond Myklebust ret = nfs_set_page_writeback(page); 319074cc1deSTrond Myklebust BUG_ON(ret != 0); 320074cc1deSTrond Myklebust BUG_ON(test_bit(PG_CLEAN, &req->wb_flags)); 321074cc1deSTrond Myklebust 322f8512ad0SFred Isaman if (!nfs_pageio_add_request(pgio, req)) { 323f8512ad0SFred Isaman nfs_redirty_request(req); 324074cc1deSTrond Myklebust ret = pgio->pg_error; 325f8512ad0SFred Isaman } 326074cc1deSTrond Myklebust out: 327074cc1deSTrond Myklebust return ret; 328e261f51fSTrond Myklebust } 329e261f51fSTrond Myklebust 330f758c885STrond Myklebust static int nfs_do_writepage(struct page *page, struct writeback_control *wbc, struct nfs_pageio_descriptor *pgio) 331f758c885STrond Myklebust { 332d56b4ddfSMel Gorman struct inode *inode = page_file_mapping(page)->host; 333cfb506e1STrond Myklebust int ret; 334f758c885STrond Myklebust 335f758c885STrond Myklebust nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE); 336f758c885STrond Myklebust nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1); 337f758c885STrond Myklebust 338d56b4ddfSMel Gorman nfs_pageio_cond_complete(pgio, page_file_index(page)); 3391b430beeSWu Fengguang ret = nfs_page_async_flush(pgio, page, wbc->sync_mode == WB_SYNC_NONE); 340cfb506e1STrond Myklebust if (ret == -EAGAIN) { 341cfb506e1STrond Myklebust redirty_page_for_writepage(wbc, page); 342cfb506e1STrond Myklebust ret = 0; 343cfb506e1STrond Myklebust } 344cfb506e1STrond Myklebust return ret; 345f758c885STrond Myklebust } 346f758c885STrond Myklebust 347e261f51fSTrond Myklebust /* 3481da177e4SLinus Torvalds * Write an mmapped page to the server. 3491da177e4SLinus Torvalds */ 3504d770ccfSTrond Myklebust static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc) 3511da177e4SLinus Torvalds { 352f758c885STrond Myklebust struct nfs_pageio_descriptor pgio; 353e261f51fSTrond Myklebust int err; 3541da177e4SLinus Torvalds 355d56b4ddfSMel Gorman NFS_PROTO(page_file_mapping(page)->host)->write_pageio_init(&pgio, 35657208fa7SBryan Schumaker page->mapping->host, 35757208fa7SBryan Schumaker wb_priority(wbc), 358061ae2edSFred Isaman &nfs_async_write_completion_ops); 359f758c885STrond Myklebust err = nfs_do_writepage(page, wbc, &pgio); 360f758c885STrond Myklebust nfs_pageio_complete(&pgio); 361f758c885STrond Myklebust if (err < 0) 3624d770ccfSTrond Myklebust return err; 363f758c885STrond Myklebust if (pgio.pg_error < 0) 364f758c885STrond Myklebust return pgio.pg_error; 365f758c885STrond Myklebust return 0; 3664d770ccfSTrond Myklebust } 3674d770ccfSTrond Myklebust 3684d770ccfSTrond Myklebust int nfs_writepage(struct page *page, struct writeback_control *wbc) 3694d770ccfSTrond Myklebust { 370f758c885STrond Myklebust int ret; 3714d770ccfSTrond Myklebust 372f758c885STrond Myklebust ret = nfs_writepage_locked(page, wbc); 3731da177e4SLinus Torvalds unlock_page(page); 374f758c885STrond Myklebust return ret; 375f758c885STrond Myklebust } 376f758c885STrond Myklebust 377f758c885STrond Myklebust static int nfs_writepages_callback(struct page *page, struct writeback_control *wbc, void *data) 378f758c885STrond Myklebust { 379f758c885STrond Myklebust int ret; 380f758c885STrond Myklebust 381f758c885STrond Myklebust ret = nfs_do_writepage(page, wbc, data); 382f758c885STrond Myklebust unlock_page(page); 383f758c885STrond Myklebust return ret; 3841da177e4SLinus Torvalds } 3851da177e4SLinus Torvalds 3861da177e4SLinus Torvalds int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc) 3871da177e4SLinus Torvalds { 3881da177e4SLinus Torvalds struct inode *inode = mapping->host; 38972cb77f4STrond Myklebust unsigned long *bitlock = &NFS_I(inode)->flags; 390c63c7b05STrond Myklebust struct nfs_pageio_descriptor pgio; 3911da177e4SLinus Torvalds int err; 3921da177e4SLinus Torvalds 39372cb77f4STrond Myklebust /* Stop dirtying of new pages while we sync */ 39472cb77f4STrond Myklebust err = wait_on_bit_lock(bitlock, NFS_INO_FLUSHING, 39572cb77f4STrond Myklebust nfs_wait_bit_killable, TASK_KILLABLE); 39672cb77f4STrond Myklebust if (err) 39772cb77f4STrond Myklebust goto out_err; 39872cb77f4STrond Myklebust 39991d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES); 40091d5b470SChuck Lever 40157208fa7SBryan Schumaker NFS_PROTO(inode)->write_pageio_init(&pgio, inode, wb_priority(wbc), &nfs_async_write_completion_ops); 402f758c885STrond Myklebust err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio); 403c63c7b05STrond Myklebust nfs_pageio_complete(&pgio); 40472cb77f4STrond Myklebust 40572cb77f4STrond Myklebust clear_bit_unlock(NFS_INO_FLUSHING, bitlock); 40672cb77f4STrond Myklebust smp_mb__after_clear_bit(); 40772cb77f4STrond Myklebust wake_up_bit(bitlock, NFS_INO_FLUSHING); 40872cb77f4STrond Myklebust 409f758c885STrond Myklebust if (err < 0) 41072cb77f4STrond Myklebust goto out_err; 41172cb77f4STrond Myklebust err = pgio.pg_error; 41272cb77f4STrond Myklebust if (err < 0) 41372cb77f4STrond Myklebust goto out_err; 414c63c7b05STrond Myklebust return 0; 41572cb77f4STrond Myklebust out_err: 41672cb77f4STrond Myklebust return err; 4171da177e4SLinus Torvalds } 4181da177e4SLinus Torvalds 4191da177e4SLinus Torvalds /* 4201da177e4SLinus Torvalds * Insert a write request into an inode 4211da177e4SLinus Torvalds */ 422d6d6dc7cSFred Isaman static void nfs_inode_add_request(struct inode *inode, struct nfs_page *req) 4231da177e4SLinus Torvalds { 4241da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 425e7d39069STrond Myklebust 426e7d39069STrond Myklebust /* Lock the request! */ 4277ad84aa9STrond Myklebust nfs_lock_request(req); 428e7d39069STrond Myklebust 429e7d39069STrond Myklebust spin_lock(&inode->i_lock); 430011e2a7fSBryan Schumaker if (!nfsi->npages && NFS_PROTO(inode)->have_delegation(inode, FMODE_WRITE)) 431a9a4a87aSTrond Myklebust inode->i_version++; 43229418aa4SMel Gorman /* 43329418aa4SMel Gorman * Swap-space should not get truncated. Hence no need to plug the race 43429418aa4SMel Gorman * with invalidate/truncate. 43529418aa4SMel Gorman */ 43629418aa4SMel Gorman if (likely(!PageSwapCache(req->wb_page))) { 4372df485a7STrond Myklebust set_bit(PG_MAPPED, &req->wb_flags); 438deb7d638STrond Myklebust SetPagePrivate(req->wb_page); 439277459d2STrond Myklebust set_page_private(req->wb_page, (unsigned long)req); 44029418aa4SMel Gorman } 4411da177e4SLinus Torvalds nfsi->npages++; 442c03b4024STrond Myklebust kref_get(&req->wb_kref); 443e7d39069STrond Myklebust spin_unlock(&inode->i_lock); 4441da177e4SLinus Torvalds } 4451da177e4SLinus Torvalds 4461da177e4SLinus Torvalds /* 44789a09141SPeter Zijlstra * Remove a write request from an inode 4481da177e4SLinus Torvalds */ 4491da177e4SLinus Torvalds static void nfs_inode_remove_request(struct nfs_page *req) 4501da177e4SLinus Torvalds { 4513d4ff43dSAl Viro struct inode *inode = req->wb_context->dentry->d_inode; 4521da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 4531da177e4SLinus Torvalds 4541da177e4SLinus Torvalds BUG_ON (!NFS_WBACK_BUSY(req)); 4551da177e4SLinus Torvalds 456587142f8STrond Myklebust spin_lock(&inode->i_lock); 45729418aa4SMel Gorman if (likely(!PageSwapCache(req->wb_page))) { 458277459d2STrond Myklebust set_page_private(req->wb_page, 0); 459deb7d638STrond Myklebust ClearPagePrivate(req->wb_page); 4602df485a7STrond Myklebust clear_bit(PG_MAPPED, &req->wb_flags); 46129418aa4SMel Gorman } 4621da177e4SLinus Torvalds nfsi->npages--; 463587142f8STrond Myklebust spin_unlock(&inode->i_lock); 4641da177e4SLinus Torvalds nfs_release_request(req); 4651da177e4SLinus Torvalds } 4661da177e4SLinus Torvalds 46761822ab5STrond Myklebust static void 4686d884e8fSFred nfs_mark_request_dirty(struct nfs_page *req) 46961822ab5STrond Myklebust { 47061822ab5STrond Myklebust __set_page_dirty_nobuffers(req->wb_page); 47161822ab5STrond Myklebust } 47261822ab5STrond Myklebust 47389d77c8fSBryan Schumaker #if IS_ENABLED(CONFIG_NFS_V3) || IS_ENABLED(CONFIG_NFS_V4) 4748dd37758STrond Myklebust /** 4758dd37758STrond Myklebust * nfs_request_add_commit_list - add request to a commit list 4768dd37758STrond Myklebust * @req: pointer to a struct nfs_page 477ea2cf228SFred Isaman * @dst: commit list head 478ea2cf228SFred Isaman * @cinfo: holds list lock and accounting info 4798dd37758STrond Myklebust * 480ea2cf228SFred Isaman * This sets the PG_CLEAN bit, updates the cinfo count of 4818dd37758STrond Myklebust * number of outstanding requests requiring a commit as well as 4828dd37758STrond Myklebust * the MM page stats. 4838dd37758STrond Myklebust * 484ea2cf228SFred Isaman * The caller must _not_ hold the cinfo->lock, but must be 4858dd37758STrond Myklebust * holding the nfs_page lock. 4868dd37758STrond Myklebust */ 4878dd37758STrond Myklebust void 488ea2cf228SFred Isaman nfs_request_add_commit_list(struct nfs_page *req, struct list_head *dst, 489ea2cf228SFred Isaman struct nfs_commit_info *cinfo) 4908dd37758STrond Myklebust { 4918dd37758STrond Myklebust set_bit(PG_CLEAN, &(req)->wb_flags); 492ea2cf228SFred Isaman spin_lock(cinfo->lock); 493ea2cf228SFred Isaman nfs_list_add_request(req, dst); 494ea2cf228SFred Isaman cinfo->mds->ncommit++; 495ea2cf228SFred Isaman spin_unlock(cinfo->lock); 49656f9cd68SFred Isaman if (!cinfo->dreq) { 4978dd37758STrond Myklebust inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); 498d56b4ddfSMel Gorman inc_bdi_stat(page_file_mapping(req->wb_page)->backing_dev_info, 49956f9cd68SFred Isaman BDI_RECLAIMABLE); 50056f9cd68SFred Isaman __mark_inode_dirty(req->wb_context->dentry->d_inode, 50156f9cd68SFred Isaman I_DIRTY_DATASYNC); 50256f9cd68SFred Isaman } 5038dd37758STrond Myklebust } 5048dd37758STrond Myklebust EXPORT_SYMBOL_GPL(nfs_request_add_commit_list); 5058dd37758STrond Myklebust 5068dd37758STrond Myklebust /** 5078dd37758STrond Myklebust * nfs_request_remove_commit_list - Remove request from a commit list 5088dd37758STrond Myklebust * @req: pointer to a nfs_page 509ea2cf228SFred Isaman * @cinfo: holds list lock and accounting info 5108dd37758STrond Myklebust * 511ea2cf228SFred Isaman * This clears the PG_CLEAN bit, and updates the cinfo's count of 5128dd37758STrond Myklebust * number of outstanding requests requiring a commit 5138dd37758STrond Myklebust * It does not update the MM page stats. 5148dd37758STrond Myklebust * 515ea2cf228SFred Isaman * The caller _must_ hold the cinfo->lock and the nfs_page lock. 5168dd37758STrond Myklebust */ 5178dd37758STrond Myklebust void 518ea2cf228SFred Isaman nfs_request_remove_commit_list(struct nfs_page *req, 519ea2cf228SFred Isaman struct nfs_commit_info *cinfo) 5208dd37758STrond Myklebust { 5218dd37758STrond Myklebust if (!test_and_clear_bit(PG_CLEAN, &(req)->wb_flags)) 5228dd37758STrond Myklebust return; 5238dd37758STrond Myklebust nfs_list_remove_request(req); 524ea2cf228SFred Isaman cinfo->mds->ncommit--; 5258dd37758STrond Myklebust } 5268dd37758STrond Myklebust EXPORT_SYMBOL_GPL(nfs_request_remove_commit_list); 5278dd37758STrond Myklebust 528ea2cf228SFred Isaman static void nfs_init_cinfo_from_inode(struct nfs_commit_info *cinfo, 529ea2cf228SFred Isaman struct inode *inode) 530ea2cf228SFred Isaman { 531ea2cf228SFred Isaman cinfo->lock = &inode->i_lock; 532ea2cf228SFred Isaman cinfo->mds = &NFS_I(inode)->commit_info; 533ea2cf228SFred Isaman cinfo->ds = pnfs_get_ds_info(inode); 534b359f9d0SFred Isaman cinfo->dreq = NULL; 535f453a54aSFred Isaman cinfo->completion_ops = &nfs_commit_completion_ops; 536ea2cf228SFred Isaman } 537ea2cf228SFred Isaman 538ea2cf228SFred Isaman void nfs_init_cinfo(struct nfs_commit_info *cinfo, 539ea2cf228SFred Isaman struct inode *inode, 540ea2cf228SFred Isaman struct nfs_direct_req *dreq) 541ea2cf228SFred Isaman { 5421763da12SFred Isaman if (dreq) 5431763da12SFred Isaman nfs_init_cinfo_from_dreq(cinfo, dreq); 5441763da12SFred Isaman else 545ea2cf228SFred Isaman nfs_init_cinfo_from_inode(cinfo, inode); 546ea2cf228SFred Isaman } 547ea2cf228SFred Isaman EXPORT_SYMBOL_GPL(nfs_init_cinfo); 5488dd37758STrond Myklebust 5491da177e4SLinus Torvalds /* 5501da177e4SLinus Torvalds * Add a request to the inode's commit list. 5511da177e4SLinus Torvalds */ 5521763da12SFred Isaman void 553ea2cf228SFred Isaman nfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg, 554ea2cf228SFred Isaman struct nfs_commit_info *cinfo) 5551da177e4SLinus Torvalds { 556ea2cf228SFred Isaman if (pnfs_mark_request_commit(req, lseg, cinfo)) 5578dd37758STrond Myklebust return; 558ea2cf228SFred Isaman nfs_request_add_commit_list(req, &cinfo->mds->list, cinfo); 5591da177e4SLinus Torvalds } 5608e821cadSTrond Myklebust 561d6d6dc7cSFred Isaman static void 562d6d6dc7cSFred Isaman nfs_clear_page_commit(struct page *page) 563e468bae9STrond Myklebust { 564e468bae9STrond Myklebust dec_zone_page_state(page, NR_UNSTABLE_NFS); 565d56b4ddfSMel Gorman dec_bdi_stat(page_file_mapping(page)->backing_dev_info, BDI_RECLAIMABLE); 566e468bae9STrond Myklebust } 567d6d6dc7cSFred Isaman 5688dd37758STrond Myklebust static void 569d6d6dc7cSFred Isaman nfs_clear_request_commit(struct nfs_page *req) 570d6d6dc7cSFred Isaman { 5718dd37758STrond Myklebust if (test_bit(PG_CLEAN, &req->wb_flags)) { 5728dd37758STrond Myklebust struct inode *inode = req->wb_context->dentry->d_inode; 573ea2cf228SFred Isaman struct nfs_commit_info cinfo; 574d6d6dc7cSFred Isaman 575ea2cf228SFred Isaman nfs_init_cinfo_from_inode(&cinfo, inode); 576ea2cf228SFred Isaman if (!pnfs_clear_request_commit(req, &cinfo)) { 577ea2cf228SFred Isaman spin_lock(cinfo.lock); 578ea2cf228SFred Isaman nfs_request_remove_commit_list(req, &cinfo); 579ea2cf228SFred Isaman spin_unlock(cinfo.lock); 580d6d6dc7cSFred Isaman } 5818dd37758STrond Myklebust nfs_clear_page_commit(req->wb_page); 5828dd37758STrond Myklebust } 583e468bae9STrond Myklebust } 584e468bae9STrond Myklebust 5858e821cadSTrond Myklebust static inline 5868e821cadSTrond Myklebust int nfs_write_need_commit(struct nfs_write_data *data) 5878e821cadSTrond Myklebust { 588465d5243SFred Isaman if (data->verf.committed == NFS_DATA_SYNC) 589cd841605SFred Isaman return data->header->lseg == NULL; 5908e821cadSTrond Myklebust return data->verf.committed != NFS_FILE_SYNC; 5918e821cadSTrond Myklebust } 5928e821cadSTrond Myklebust 5938e821cadSTrond Myklebust #else 59468cd6fa4SBryan Schumaker static void nfs_init_cinfo_from_inode(struct nfs_commit_info *cinfo, 59568cd6fa4SBryan Schumaker struct inode *inode) 59668cd6fa4SBryan Schumaker { 59768cd6fa4SBryan Schumaker } 59868cd6fa4SBryan Schumaker 59968cd6fa4SBryan Schumaker void nfs_init_cinfo(struct nfs_commit_info *cinfo, 60068cd6fa4SBryan Schumaker struct inode *inode, 60168cd6fa4SBryan Schumaker struct nfs_direct_req *dreq) 60268cd6fa4SBryan Schumaker { 60368cd6fa4SBryan Schumaker } 60468cd6fa4SBryan Schumaker 6051763da12SFred Isaman void 606ea2cf228SFred Isaman nfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg, 607ea2cf228SFred Isaman struct nfs_commit_info *cinfo) 6088e821cadSTrond Myklebust { 6098e821cadSTrond Myklebust } 6108e821cadSTrond Myklebust 6118dd37758STrond Myklebust static void 612e468bae9STrond Myklebust nfs_clear_request_commit(struct nfs_page *req) 613e468bae9STrond Myklebust { 614e468bae9STrond Myklebust } 615e468bae9STrond Myklebust 6168e821cadSTrond Myklebust static inline 6178e821cadSTrond Myklebust int nfs_write_need_commit(struct nfs_write_data *data) 6188e821cadSTrond Myklebust { 6198e821cadSTrond Myklebust return 0; 6208e821cadSTrond Myklebust } 6218e821cadSTrond Myklebust 6221da177e4SLinus Torvalds #endif 6231da177e4SLinus Torvalds 624061ae2edSFred Isaman static void nfs_write_completion(struct nfs_pgio_header *hdr) 6256c75dc0dSFred Isaman { 626ea2cf228SFred Isaman struct nfs_commit_info cinfo; 6276c75dc0dSFred Isaman unsigned long bytes = 0; 6286c75dc0dSFred Isaman 6296c75dc0dSFred Isaman if (test_bit(NFS_IOHDR_REDO, &hdr->flags)) 6306c75dc0dSFred Isaman goto out; 631ea2cf228SFred Isaman nfs_init_cinfo_from_inode(&cinfo, hdr->inode); 6326c75dc0dSFred Isaman while (!list_empty(&hdr->pages)) { 6336c75dc0dSFred Isaman struct nfs_page *req = nfs_list_entry(hdr->pages.next); 6346c75dc0dSFred Isaman 6356c75dc0dSFred Isaman bytes += req->wb_bytes; 6366c75dc0dSFred Isaman nfs_list_remove_request(req); 6376c75dc0dSFred Isaman if (test_bit(NFS_IOHDR_ERROR, &hdr->flags) && 6386c75dc0dSFred Isaman (hdr->good_bytes < bytes)) { 639d1182b33STrond Myklebust nfs_set_pageerror(req->wb_page); 6406c75dc0dSFred Isaman nfs_context_set_write_error(req->wb_context, hdr->error); 6416c75dc0dSFred Isaman goto remove_req; 6426c75dc0dSFred Isaman } 6436c75dc0dSFred Isaman if (test_bit(NFS_IOHDR_NEED_RESCHED, &hdr->flags)) { 6446c75dc0dSFred Isaman nfs_mark_request_dirty(req); 6456c75dc0dSFred Isaman goto next; 6466c75dc0dSFred Isaman } 6476c75dc0dSFred Isaman if (test_bit(NFS_IOHDR_NEED_COMMIT, &hdr->flags)) { 6482f2c63bcSTrond Myklebust memcpy(&req->wb_verf, &hdr->verf->verifier, sizeof(req->wb_verf)); 649ea2cf228SFred Isaman nfs_mark_request_commit(req, hdr->lseg, &cinfo); 6506c75dc0dSFred Isaman goto next; 6516c75dc0dSFred Isaman } 6526c75dc0dSFred Isaman remove_req: 6536c75dc0dSFred Isaman nfs_inode_remove_request(req); 6546c75dc0dSFred Isaman next: 6551d1afcbcSTrond Myklebust nfs_unlock_request(req); 656d1182b33STrond Myklebust nfs_end_page_writeback(req->wb_page); 6573aff4ebbSTrond Myklebust nfs_release_request(req); 6586c75dc0dSFred Isaman } 6596c75dc0dSFred Isaman out: 6606c75dc0dSFred Isaman hdr->release(hdr); 6616c75dc0dSFred Isaman } 6626c75dc0dSFred Isaman 66389d77c8fSBryan Schumaker #if IS_ENABLED(CONFIG_NFS_V3) || IS_ENABLED(CONFIG_NFS_V4) 664ea2cf228SFred Isaman static unsigned long 665ea2cf228SFred Isaman nfs_reqs_to_commit(struct nfs_commit_info *cinfo) 666fb8a1f11STrond Myklebust { 667ea2cf228SFred Isaman return cinfo->mds->ncommit; 668fb8a1f11STrond Myklebust } 669fb8a1f11STrond Myklebust 670ea2cf228SFred Isaman /* cinfo->lock held by caller */ 6711763da12SFred Isaman int 672ea2cf228SFred Isaman nfs_scan_commit_list(struct list_head *src, struct list_head *dst, 673ea2cf228SFred Isaman struct nfs_commit_info *cinfo, int max) 674d6d6dc7cSFred Isaman { 675d6d6dc7cSFred Isaman struct nfs_page *req, *tmp; 676d6d6dc7cSFred Isaman int ret = 0; 677d6d6dc7cSFred Isaman 678d6d6dc7cSFred Isaman list_for_each_entry_safe(req, tmp, src, wb_list) { 6798dd37758STrond Myklebust if (!nfs_lock_request(req)) 6808dd37758STrond Myklebust continue; 6817ad84aa9STrond Myklebust kref_get(&req->wb_kref); 682ea2cf228SFred Isaman if (cond_resched_lock(cinfo->lock)) 6833b3be88dSTrond Myklebust list_safe_reset_next(req, tmp, wb_list); 684ea2cf228SFred Isaman nfs_request_remove_commit_list(req, cinfo); 6858dd37758STrond Myklebust nfs_list_add_request(req, dst); 686d6d6dc7cSFred Isaman ret++; 6871763da12SFred Isaman if ((ret == max) && !cinfo->dreq) 688d6d6dc7cSFred Isaman break; 689d6d6dc7cSFred Isaman } 690d6d6dc7cSFred Isaman return ret; 691d6d6dc7cSFred Isaman } 692d6d6dc7cSFred Isaman 6931da177e4SLinus Torvalds /* 6941da177e4SLinus Torvalds * nfs_scan_commit - Scan an inode for commit requests 6951da177e4SLinus Torvalds * @inode: NFS inode to scan 696ea2cf228SFred Isaman * @dst: mds destination list 697ea2cf228SFred Isaman * @cinfo: mds and ds lists of reqs ready to commit 6981da177e4SLinus Torvalds * 6991da177e4SLinus Torvalds * Moves requests from the inode's 'commit' request list. 7001da177e4SLinus Torvalds * The requests are *not* checked to ensure that they form a contiguous set. 7011da177e4SLinus Torvalds */ 7021763da12SFred Isaman int 703ea2cf228SFred Isaman nfs_scan_commit(struct inode *inode, struct list_head *dst, 704ea2cf228SFred Isaman struct nfs_commit_info *cinfo) 7051da177e4SLinus Torvalds { 706d6d6dc7cSFred Isaman int ret = 0; 707fb8a1f11STrond Myklebust 708ea2cf228SFred Isaman spin_lock(cinfo->lock); 709ea2cf228SFred Isaman if (cinfo->mds->ncommit > 0) { 7108dd37758STrond Myklebust const int max = INT_MAX; 711d6d6dc7cSFred Isaman 712ea2cf228SFred Isaman ret = nfs_scan_commit_list(&cinfo->mds->list, dst, 713ea2cf228SFred Isaman cinfo, max); 714ea2cf228SFred Isaman ret += pnfs_scan_commit_lists(inode, cinfo, max - ret); 715d6d6dc7cSFred Isaman } 716ea2cf228SFred Isaman spin_unlock(cinfo->lock); 717ff778d02STrond Myklebust return ret; 7181da177e4SLinus Torvalds } 719d6d6dc7cSFred Isaman 720c42de9ddSTrond Myklebust #else 721ea2cf228SFred Isaman static unsigned long nfs_reqs_to_commit(struct nfs_commit_info *cinfo) 722fb8a1f11STrond Myklebust { 723fb8a1f11STrond Myklebust return 0; 724fb8a1f11STrond Myklebust } 725fb8a1f11STrond Myklebust 7261763da12SFred Isaman int nfs_scan_commit(struct inode *inode, struct list_head *dst, 727ea2cf228SFred Isaman struct nfs_commit_info *cinfo) 728c42de9ddSTrond Myklebust { 729c42de9ddSTrond Myklebust return 0; 730c42de9ddSTrond Myklebust } 7311da177e4SLinus Torvalds #endif 7321da177e4SLinus Torvalds 7331da177e4SLinus Torvalds /* 734e7d39069STrond Myklebust * Search for an existing write request, and attempt to update 735e7d39069STrond Myklebust * it to reflect a new dirty region on a given page. 7361da177e4SLinus Torvalds * 737e7d39069STrond Myklebust * If the attempt fails, then the existing request is flushed out 738e7d39069STrond Myklebust * to disk. 7391da177e4SLinus Torvalds */ 740e7d39069STrond Myklebust static struct nfs_page *nfs_try_to_update_request(struct inode *inode, 741e7d39069STrond Myklebust struct page *page, 742e7d39069STrond Myklebust unsigned int offset, 743e7d39069STrond Myklebust unsigned int bytes) 7441da177e4SLinus Torvalds { 745e7d39069STrond Myklebust struct nfs_page *req; 746e7d39069STrond Myklebust unsigned int rqend; 747e7d39069STrond Myklebust unsigned int end; 7481da177e4SLinus Torvalds int error; 749277459d2STrond Myklebust 750e7d39069STrond Myklebust if (!PagePrivate(page)) 751e7d39069STrond Myklebust return NULL; 752e7d39069STrond Myklebust 753e7d39069STrond Myklebust end = offset + bytes; 754e7d39069STrond Myklebust spin_lock(&inode->i_lock); 755e7d39069STrond Myklebust 756e7d39069STrond Myklebust for (;;) { 75729418aa4SMel Gorman req = nfs_page_find_request_locked(NFS_I(inode), page); 758e7d39069STrond Myklebust if (req == NULL) 759e7d39069STrond Myklebust goto out_unlock; 760e7d39069STrond Myklebust 761e7d39069STrond Myklebust rqend = req->wb_offset + req->wb_bytes; 762e7d39069STrond Myklebust /* 763e7d39069STrond Myklebust * Tell the caller to flush out the request if 764e7d39069STrond Myklebust * the offsets are non-contiguous. 765e7d39069STrond Myklebust * Note: nfs_flush_incompatible() will already 766e7d39069STrond Myklebust * have flushed out requests having wrong owners. 767e7d39069STrond Myklebust */ 768e468bae9STrond Myklebust if (offset > rqend 769e7d39069STrond Myklebust || end < req->wb_offset) 770e7d39069STrond Myklebust goto out_flushme; 771e7d39069STrond Myklebust 7727ad84aa9STrond Myklebust if (nfs_lock_request(req)) 773e7d39069STrond Myklebust break; 774e7d39069STrond Myklebust 775e7d39069STrond Myklebust /* The request is locked, so wait and then retry */ 776587142f8STrond Myklebust spin_unlock(&inode->i_lock); 7771da177e4SLinus Torvalds error = nfs_wait_on_request(req); 7781da177e4SLinus Torvalds nfs_release_request(req); 779e7d39069STrond Myklebust if (error != 0) 780e7d39069STrond Myklebust goto out_err; 781e7d39069STrond Myklebust spin_lock(&inode->i_lock); 7821da177e4SLinus Torvalds } 7831da177e4SLinus Torvalds 7841da177e4SLinus Torvalds /* Okay, the request matches. Update the region */ 7851da177e4SLinus Torvalds if (offset < req->wb_offset) { 7861da177e4SLinus Torvalds req->wb_offset = offset; 7871da177e4SLinus Torvalds req->wb_pgbase = offset; 7881da177e4SLinus Torvalds } 7891da177e4SLinus Torvalds if (end > rqend) 7901da177e4SLinus Torvalds req->wb_bytes = end - req->wb_offset; 791e7d39069STrond Myklebust else 792e7d39069STrond Myklebust req->wb_bytes = rqend - req->wb_offset; 793e7d39069STrond Myklebust out_unlock: 794e7d39069STrond Myklebust spin_unlock(&inode->i_lock); 795ca138f36SFred Isaman if (req) 7968dd37758STrond Myklebust nfs_clear_request_commit(req); 797e7d39069STrond Myklebust return req; 798e7d39069STrond Myklebust out_flushme: 799e7d39069STrond Myklebust spin_unlock(&inode->i_lock); 800e7d39069STrond Myklebust nfs_release_request(req); 801e7d39069STrond Myklebust error = nfs_wb_page(inode, page); 802e7d39069STrond Myklebust out_err: 803e7d39069STrond Myklebust return ERR_PTR(error); 804e7d39069STrond Myklebust } 8051da177e4SLinus Torvalds 806e7d39069STrond Myklebust /* 807e7d39069STrond Myklebust * Try to update an existing write request, or create one if there is none. 808e7d39069STrond Myklebust * 809e7d39069STrond Myklebust * Note: Should always be called with the Page Lock held to prevent races 810e7d39069STrond Myklebust * if we have to add a new request. Also assumes that the caller has 811e7d39069STrond Myklebust * already called nfs_flush_incompatible() if necessary. 812e7d39069STrond Myklebust */ 813e7d39069STrond Myklebust static struct nfs_page * nfs_setup_write_request(struct nfs_open_context* ctx, 814e7d39069STrond Myklebust struct page *page, unsigned int offset, unsigned int bytes) 815e7d39069STrond Myklebust { 816d56b4ddfSMel Gorman struct inode *inode = page_file_mapping(page)->host; 817e7d39069STrond Myklebust struct nfs_page *req; 818e7d39069STrond Myklebust 819e7d39069STrond Myklebust req = nfs_try_to_update_request(inode, page, offset, bytes); 820e7d39069STrond Myklebust if (req != NULL) 821e7d39069STrond Myklebust goto out; 822e7d39069STrond Myklebust req = nfs_create_request(ctx, inode, page, offset, bytes); 823e7d39069STrond Myklebust if (IS_ERR(req)) 824e7d39069STrond Myklebust goto out; 825d6d6dc7cSFred Isaman nfs_inode_add_request(inode, req); 826efc91ed0STrond Myklebust out: 82761e930a9STrond Myklebust return req; 8281da177e4SLinus Torvalds } 8291da177e4SLinus Torvalds 830e7d39069STrond Myklebust static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page, 831e7d39069STrond Myklebust unsigned int offset, unsigned int count) 832e7d39069STrond Myklebust { 833e7d39069STrond Myklebust struct nfs_page *req; 834e7d39069STrond Myklebust 835e7d39069STrond Myklebust req = nfs_setup_write_request(ctx, page, offset, count); 836e7d39069STrond Myklebust if (IS_ERR(req)) 837e7d39069STrond Myklebust return PTR_ERR(req); 838e7d39069STrond Myklebust /* Update file length */ 839e7d39069STrond Myklebust nfs_grow_file(page, offset, count); 840e7d39069STrond Myklebust nfs_mark_uptodate(page, req->wb_pgbase, req->wb_bytes); 841a6305ddbSTrond Myklebust nfs_mark_request_dirty(req); 8421d1afcbcSTrond Myklebust nfs_unlock_and_release_request(req); 843e7d39069STrond Myklebust return 0; 844e7d39069STrond Myklebust } 845e7d39069STrond Myklebust 8461da177e4SLinus Torvalds int nfs_flush_incompatible(struct file *file, struct page *page) 8471da177e4SLinus Torvalds { 848cd3758e3STrond Myklebust struct nfs_open_context *ctx = nfs_file_open_context(file); 849*2a369153STrond Myklebust struct nfs_lock_context *l_ctx; 8501da177e4SLinus Torvalds struct nfs_page *req; 8511a54533eSTrond Myklebust int do_flush, status; 8521da177e4SLinus Torvalds /* 8531da177e4SLinus Torvalds * Look for a request corresponding to this page. If there 8541da177e4SLinus Torvalds * is one, and it belongs to another file, we flush it out 8551da177e4SLinus Torvalds * before we try to copy anything into the page. Do this 8561da177e4SLinus Torvalds * due to the lack of an ACCESS-type call in NFSv2. 8571da177e4SLinus Torvalds * Also do the same if we find a request from an existing 8581da177e4SLinus Torvalds * dropped page. 8591da177e4SLinus Torvalds */ 8601a54533eSTrond Myklebust do { 861277459d2STrond Myklebust req = nfs_page_find_request(page); 8621a54533eSTrond Myklebust if (req == NULL) 8631a54533eSTrond Myklebust return 0; 864*2a369153STrond Myklebust l_ctx = req->wb_lock_context; 865*2a369153STrond Myklebust do_flush = req->wb_page != page || req->wb_context != ctx; 866*2a369153STrond Myklebust if (l_ctx) { 867*2a369153STrond Myklebust do_flush |= l_ctx->lockowner.l_owner != current->files 868*2a369153STrond Myklebust || l_ctx->lockowner.l_pid != current->tgid; 869*2a369153STrond Myklebust } 8701da177e4SLinus Torvalds nfs_release_request(req); 8711a54533eSTrond Myklebust if (!do_flush) 8721a54533eSTrond Myklebust return 0; 873d56b4ddfSMel Gorman status = nfs_wb_page(page_file_mapping(page)->host, page); 8741a54533eSTrond Myklebust } while (status == 0); 8751a54533eSTrond Myklebust return status; 8761da177e4SLinus Torvalds } 8771da177e4SLinus Torvalds 8781da177e4SLinus Torvalds /* 8795d47a356STrond Myklebust * If the page cache is marked as unsafe or invalid, then we can't rely on 8805d47a356STrond Myklebust * the PageUptodate() flag. In this case, we will need to turn off 8815d47a356STrond Myklebust * write optimisations that depend on the page contents being correct. 8825d47a356STrond Myklebust */ 8838d197a56STrond Myklebust static bool nfs_write_pageuptodate(struct page *page, struct inode *inode) 8845d47a356STrond Myklebust { 8858d197a56STrond Myklebust if (nfs_have_delegated_attributes(inode)) 8868d197a56STrond Myklebust goto out; 8878d197a56STrond Myklebust if (NFS_I(inode)->cache_validity & NFS_INO_REVAL_PAGECACHE) 8888d197a56STrond Myklebust return false; 8898d197a56STrond Myklebust out: 8908d197a56STrond Myklebust return PageUptodate(page) != 0; 8915d47a356STrond Myklebust } 8925d47a356STrond Myklebust 8935d47a356STrond Myklebust /* 8941da177e4SLinus Torvalds * Update and possibly write a cached page of an NFS file. 8951da177e4SLinus Torvalds * 8961da177e4SLinus Torvalds * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad 8971da177e4SLinus Torvalds * things with a page scheduled for an RPC call (e.g. invalidate it). 8981da177e4SLinus Torvalds */ 8991da177e4SLinus Torvalds int nfs_updatepage(struct file *file, struct page *page, 9001da177e4SLinus Torvalds unsigned int offset, unsigned int count) 9011da177e4SLinus Torvalds { 902cd3758e3STrond Myklebust struct nfs_open_context *ctx = nfs_file_open_context(file); 903d56b4ddfSMel Gorman struct inode *inode = page_file_mapping(page)->host; 9041da177e4SLinus Torvalds int status = 0; 9051da177e4SLinus Torvalds 90691d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE); 90791d5b470SChuck Lever 90848186c7dSChuck Lever dprintk("NFS: nfs_updatepage(%s/%s %d@%lld)\n", 90901cce933SJosef "Jeff" Sipek file->f_path.dentry->d_parent->d_name.name, 91001cce933SJosef "Jeff" Sipek file->f_path.dentry->d_name.name, count, 911d56b4ddfSMel Gorman (long long)(page_file_offset(page) + offset)); 9121da177e4SLinus Torvalds 9131da177e4SLinus Torvalds /* If we're not using byte range locks, and we know the page 9145d47a356STrond Myklebust * is up to date, it may be more efficient to extend the write 9155d47a356STrond Myklebust * to cover the entire page in order to avoid fragmentation 9165d47a356STrond Myklebust * inefficiencies. 9171da177e4SLinus Torvalds */ 9185d47a356STrond Myklebust if (nfs_write_pageuptodate(page, inode) && 9195d47a356STrond Myklebust inode->i_flock == NULL && 9206b2f3d1fSChristoph Hellwig !(file->f_flags & O_DSYNC)) { 92149a70f27STrond Myklebust count = max(count + offset, nfs_page_length(page)); 9221da177e4SLinus Torvalds offset = 0; 9231da177e4SLinus Torvalds } 9241da177e4SLinus Torvalds 925e21195a7STrond Myklebust status = nfs_writepage_setup(ctx, page, offset, count); 92603fa9e84STrond Myklebust if (status < 0) 92703fa9e84STrond Myklebust nfs_set_pageerror(page); 92859b7c05fSTrond Myklebust else 92959b7c05fSTrond Myklebust __set_page_dirty_nobuffers(page); 9301da177e4SLinus Torvalds 93148186c7dSChuck Lever dprintk("NFS: nfs_updatepage returns %d (isize %lld)\n", 9321da177e4SLinus Torvalds status, (long long)i_size_read(inode)); 9331da177e4SLinus Torvalds return status; 9341da177e4SLinus Torvalds } 9351da177e4SLinus Torvalds 9363ff7576dSTrond Myklebust static int flush_task_priority(int how) 9371da177e4SLinus Torvalds { 9381da177e4SLinus Torvalds switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) { 9391da177e4SLinus Torvalds case FLUSH_HIGHPRI: 9401da177e4SLinus Torvalds return RPC_PRIORITY_HIGH; 9411da177e4SLinus Torvalds case FLUSH_LOWPRI: 9421da177e4SLinus Torvalds return RPC_PRIORITY_LOW; 9431da177e4SLinus Torvalds } 9441da177e4SLinus Torvalds return RPC_PRIORITY_NORMAL; 9451da177e4SLinus Torvalds } 9461da177e4SLinus Torvalds 947c5996c4eSFred Isaman int nfs_initiate_write(struct rpc_clnt *clnt, 948c5996c4eSFred Isaman struct nfs_write_data *data, 949788e7a89STrond Myklebust const struct rpc_call_ops *call_ops, 9509f0ec176SAndy Adamson int how, int flags) 9511da177e4SLinus Torvalds { 952cd841605SFred Isaman struct inode *inode = data->header->inode; 9533ff7576dSTrond Myklebust int priority = flush_task_priority(how); 95407737691STrond Myklebust struct rpc_task *task; 955bdc7f021STrond Myklebust struct rpc_message msg = { 956bdc7f021STrond Myklebust .rpc_argp = &data->args, 957bdc7f021STrond Myklebust .rpc_resp = &data->res, 958cd841605SFred Isaman .rpc_cred = data->header->cred, 959bdc7f021STrond Myklebust }; 96084115e1cSTrond Myklebust struct rpc_task_setup task_setup_data = { 961d138d5d1SAndy Adamson .rpc_client = clnt, 96207737691STrond Myklebust .task = &data->task, 963bdc7f021STrond Myklebust .rpc_message = &msg, 96484115e1cSTrond Myklebust .callback_ops = call_ops, 96584115e1cSTrond Myklebust .callback_data = data, 966101070caSTrond Myklebust .workqueue = nfsiod_workqueue, 9679f0ec176SAndy Adamson .flags = RPC_TASK_ASYNC | flags, 9683ff7576dSTrond Myklebust .priority = priority, 96984115e1cSTrond Myklebust }; 9702c61be0aSTrond Myklebust int ret = 0; 9711da177e4SLinus Torvalds 972d138d5d1SAndy Adamson /* Set up the initial task struct. */ 973d138d5d1SAndy Adamson NFS_PROTO(inode)->write_setup(data, &msg); 974d138d5d1SAndy Adamson 975d138d5d1SAndy Adamson dprintk("NFS: %5u initiated write call " 976d138d5d1SAndy Adamson "(req %s/%lld, %u bytes @ offset %llu)\n", 977d138d5d1SAndy Adamson data->task.tk_pid, 978d138d5d1SAndy Adamson inode->i_sb->s_id, 979d138d5d1SAndy Adamson (long long)NFS_FILEID(inode), 980d138d5d1SAndy Adamson data->args.count, 981d138d5d1SAndy Adamson (unsigned long long)data->args.offset); 982d138d5d1SAndy Adamson 983d138d5d1SAndy Adamson task = rpc_run_task(&task_setup_data); 984d138d5d1SAndy Adamson if (IS_ERR(task)) { 985d138d5d1SAndy Adamson ret = PTR_ERR(task); 986d138d5d1SAndy Adamson goto out; 987d138d5d1SAndy Adamson } 988d138d5d1SAndy Adamson if (how & FLUSH_SYNC) { 989d138d5d1SAndy Adamson ret = rpc_wait_for_completion_task(task); 990d138d5d1SAndy Adamson if (ret == 0) 991d138d5d1SAndy Adamson ret = task->tk_status; 992d138d5d1SAndy Adamson } 993d138d5d1SAndy Adamson rpc_put_task(task); 994d138d5d1SAndy Adamson out: 995d138d5d1SAndy Adamson return ret; 996d138d5d1SAndy Adamson } 997a69aef14SFred Isaman EXPORT_SYMBOL_GPL(nfs_initiate_write); 998d138d5d1SAndy Adamson 999d138d5d1SAndy Adamson /* 1000d138d5d1SAndy Adamson * Set up the argument/result storage required for the RPC call. 1001d138d5d1SAndy Adamson */ 10026c75dc0dSFred Isaman static void nfs_write_rpcsetup(struct nfs_write_data *data, 1003d138d5d1SAndy Adamson unsigned int count, unsigned int offset, 1004ea2cf228SFred Isaman int how, struct nfs_commit_info *cinfo) 1005d138d5d1SAndy Adamson { 10066c75dc0dSFred Isaman struct nfs_page *req = data->header->req; 1007d138d5d1SAndy Adamson 10081da177e4SLinus Torvalds /* Set up the RPC argument and reply structs 10091da177e4SLinus Torvalds * NB: take care not to mess about with data->commit et al. */ 10101da177e4SLinus Torvalds 10116c75dc0dSFred Isaman data->args.fh = NFS_FH(data->header->inode); 10121da177e4SLinus Torvalds data->args.offset = req_offset(req) + offset; 10132bea038cSBoaz Harrosh /* pnfs_set_layoutcommit needs this */ 10142bea038cSBoaz Harrosh data->mds_offset = data->args.offset; 10151da177e4SLinus Torvalds data->args.pgbase = req->wb_pgbase + offset; 101630dd374fSFred Isaman data->args.pages = data->pages.pagevec; 10171da177e4SLinus Torvalds data->args.count = count; 1018383ba719STrond Myklebust data->args.context = get_nfs_open_context(req->wb_context); 1019f11ac8dbSTrond Myklebust data->args.lock_context = req->wb_lock_context; 1020bdc7f021STrond Myklebust data->args.stable = NFS_UNSTABLE; 102187ed5eb4STrond Myklebust switch (how & (FLUSH_STABLE | FLUSH_COND_STABLE)) { 102287ed5eb4STrond Myklebust case 0: 102387ed5eb4STrond Myklebust break; 102487ed5eb4STrond Myklebust case FLUSH_COND_STABLE: 1025ea2cf228SFred Isaman if (nfs_reqs_to_commit(cinfo)) 102687ed5eb4STrond Myklebust break; 102787ed5eb4STrond Myklebust default: 1028bdc7f021STrond Myklebust data->args.stable = NFS_FILE_SYNC; 1029bdc7f021STrond Myklebust } 10301da177e4SLinus Torvalds 10311da177e4SLinus Torvalds data->res.fattr = &data->fattr; 10321da177e4SLinus Torvalds data->res.count = count; 10331da177e4SLinus Torvalds data->res.verf = &data->verf; 10340e574af1STrond Myklebust nfs_fattr_init(&data->fattr); 10356e4efd56STrond Myklebust } 10361da177e4SLinus Torvalds 10376e4efd56STrond Myklebust static int nfs_do_write(struct nfs_write_data *data, 10386e4efd56STrond Myklebust const struct rpc_call_ops *call_ops, 10396e4efd56STrond Myklebust int how) 10406e4efd56STrond Myklebust { 1041cd841605SFred Isaman struct inode *inode = data->header->inode; 10420382b744SAndy Adamson 10439f0ec176SAndy Adamson return nfs_initiate_write(NFS_CLIENT(inode), data, call_ops, how, 0); 10441da177e4SLinus Torvalds } 10451da177e4SLinus Torvalds 1046275acaafSTrond Myklebust static int nfs_do_multiple_writes(struct list_head *head, 1047275acaafSTrond Myklebust const struct rpc_call_ops *call_ops, 1048275acaafSTrond Myklebust int how) 1049275acaafSTrond Myklebust { 1050275acaafSTrond Myklebust struct nfs_write_data *data; 1051275acaafSTrond Myklebust int ret = 0; 1052275acaafSTrond Myklebust 1053275acaafSTrond Myklebust while (!list_empty(head)) { 1054275acaafSTrond Myklebust int ret2; 1055275acaafSTrond Myklebust 10566c75dc0dSFred Isaman data = list_first_entry(head, struct nfs_write_data, list); 1057275acaafSTrond Myklebust list_del_init(&data->list); 1058275acaafSTrond Myklebust 1059dce81290STrond Myklebust ret2 = nfs_do_write(data, call_ops, how); 1060275acaafSTrond Myklebust if (ret == 0) 1061275acaafSTrond Myklebust ret = ret2; 1062275acaafSTrond Myklebust } 1063275acaafSTrond Myklebust return ret; 1064275acaafSTrond Myklebust } 1065275acaafSTrond Myklebust 10666d884e8fSFred /* If a nfs_flush_* function fails, it should remove reqs from @head and 10676d884e8fSFred * call this on each, which will prepare them to be retried on next 10686d884e8fSFred * writeback using standard nfs. 10696d884e8fSFred */ 10706d884e8fSFred static void nfs_redirty_request(struct nfs_page *req) 10716d884e8fSFred { 10726d884e8fSFred nfs_mark_request_dirty(req); 10731d1afcbcSTrond Myklebust nfs_unlock_request(req); 1074d1182b33STrond Myklebust nfs_end_page_writeback(req->wb_page); 10753aff4ebbSTrond Myklebust nfs_release_request(req); 10766d884e8fSFred } 10776d884e8fSFred 1078061ae2edSFred Isaman static void nfs_async_write_error(struct list_head *head) 10796c75dc0dSFred Isaman { 10806c75dc0dSFred Isaman struct nfs_page *req; 10816c75dc0dSFred Isaman 10826c75dc0dSFred Isaman while (!list_empty(head)) { 10836c75dc0dSFred Isaman req = nfs_list_entry(head->next); 10846c75dc0dSFred Isaman nfs_list_remove_request(req); 10856c75dc0dSFred Isaman nfs_redirty_request(req); 10866c75dc0dSFred Isaman } 10876c75dc0dSFred Isaman } 10886c75dc0dSFred Isaman 1089061ae2edSFred Isaman static const struct nfs_pgio_completion_ops nfs_async_write_completion_ops = { 1090061ae2edSFred Isaman .error_cleanup = nfs_async_write_error, 1091061ae2edSFred Isaman .completion = nfs_write_completion, 1092061ae2edSFred Isaman }; 1093061ae2edSFred Isaman 109425b11dcdSTrond Myklebust static void nfs_flush_error(struct nfs_pageio_descriptor *desc, 109525b11dcdSTrond Myklebust struct nfs_pgio_header *hdr) 109625b11dcdSTrond Myklebust { 109725b11dcdSTrond Myklebust set_bit(NFS_IOHDR_REDO, &hdr->flags); 109825b11dcdSTrond Myklebust while (!list_empty(&hdr->rpc_list)) { 109925b11dcdSTrond Myklebust struct nfs_write_data *data = list_first_entry(&hdr->rpc_list, 110025b11dcdSTrond Myklebust struct nfs_write_data, list); 110125b11dcdSTrond Myklebust list_del(&data->list); 110225b11dcdSTrond Myklebust nfs_writedata_release(data); 110325b11dcdSTrond Myklebust } 110425b11dcdSTrond Myklebust desc->pg_completion_ops->error_cleanup(&desc->pg_list); 110525b11dcdSTrond Myklebust } 110625b11dcdSTrond Myklebust 11071da177e4SLinus Torvalds /* 11081da177e4SLinus Torvalds * Generate multiple small requests to write out a single 11091da177e4SLinus Torvalds * contiguous dirty area on one page. 11101da177e4SLinus Torvalds */ 11116c75dc0dSFred Isaman static int nfs_flush_multi(struct nfs_pageio_descriptor *desc, 11126c75dc0dSFred Isaman struct nfs_pgio_header *hdr) 11131da177e4SLinus Torvalds { 11146c75dc0dSFred Isaman struct nfs_page *req = hdr->req; 11151da177e4SLinus Torvalds struct page *page = req->wb_page; 11161da177e4SLinus Torvalds struct nfs_write_data *data; 1117d097971dSTrond Myklebust size_t wsize = desc->pg_bsize, nbytes; 1118e9f7bee1STrond Myklebust unsigned int offset; 11191da177e4SLinus Torvalds int requests = 0; 1120ea2cf228SFred Isaman struct nfs_commit_info cinfo; 11211da177e4SLinus Torvalds 1122ea2cf228SFred Isaman nfs_init_cinfo(&cinfo, desc->pg_inode, desc->pg_dreq); 11231da177e4SLinus Torvalds 1124b31268acSTrond Myklebust if ((desc->pg_ioflags & FLUSH_COND_STABLE) && 1125ea2cf228SFred Isaman (desc->pg_moreio || nfs_reqs_to_commit(&cinfo) || 1126b31268acSTrond Myklebust desc->pg_count > wsize)) 1127b31268acSTrond Myklebust desc->pg_ioflags &= ~FLUSH_COND_STABLE; 1128b31268acSTrond Myklebust 1129b31268acSTrond Myklebust 1130275acaafSTrond Myklebust offset = 0; 1131c76069bdSFred Isaman nbytes = desc->pg_count; 1132e9f7bee1STrond Myklebust do { 1133e9f7bee1STrond Myklebust size_t len = min(nbytes, wsize); 1134e9f7bee1STrond Myklebust 11356c75dc0dSFred Isaman data = nfs_writedata_alloc(hdr, 1); 113625b11dcdSTrond Myklebust if (!data) { 113725b11dcdSTrond Myklebust nfs_flush_error(desc, hdr); 113825b11dcdSTrond Myklebust return -ENOMEM; 113925b11dcdSTrond Myklebust } 114030dd374fSFred Isaman data->pages.pagevec[0] = page; 1141ea2cf228SFred Isaman nfs_write_rpcsetup(data, len, offset, desc->pg_ioflags, &cinfo); 11426c75dc0dSFred Isaman list_add(&data->list, &hdr->rpc_list); 11431da177e4SLinus Torvalds requests++; 1144e9f7bee1STrond Myklebust nbytes -= len; 1145275acaafSTrond Myklebust offset += len; 1146e9f7bee1STrond Myklebust } while (nbytes != 0); 114725b11dcdSTrond Myklebust nfs_list_remove_request(req); 114825b11dcdSTrond Myklebust nfs_list_add_request(req, &hdr->pages); 11496c75dc0dSFred Isaman desc->pg_rpc_callops = &nfs_write_common_ops; 115025b11dcdSTrond Myklebust return 0; 11511da177e4SLinus Torvalds } 11521da177e4SLinus Torvalds 11531da177e4SLinus Torvalds /* 11541da177e4SLinus Torvalds * Create an RPC task for the given write request and kick it. 11551da177e4SLinus Torvalds * The page must have been locked by the caller. 11561da177e4SLinus Torvalds * 11571da177e4SLinus Torvalds * It may happen that the page we're passed is not marked dirty. 11581da177e4SLinus Torvalds * This is the case if nfs_updatepage detects a conflicting request 11591da177e4SLinus Torvalds * that has been written but not committed. 11601da177e4SLinus Torvalds */ 11616c75dc0dSFred Isaman static int nfs_flush_one(struct nfs_pageio_descriptor *desc, 11626c75dc0dSFred Isaman struct nfs_pgio_header *hdr) 11631da177e4SLinus Torvalds { 11641da177e4SLinus Torvalds struct nfs_page *req; 11651da177e4SLinus Torvalds struct page **pages; 11661da177e4SLinus Torvalds struct nfs_write_data *data; 1167c76069bdSFred Isaman struct list_head *head = &desc->pg_list; 1168ea2cf228SFred Isaman struct nfs_commit_info cinfo; 11691da177e4SLinus Torvalds 11706c75dc0dSFred Isaman data = nfs_writedata_alloc(hdr, nfs_page_array_len(desc->pg_base, 1171c76069bdSFred Isaman desc->pg_count)); 11726c75dc0dSFred Isaman if (!data) { 117325b11dcdSTrond Myklebust nfs_flush_error(desc, hdr); 117425b11dcdSTrond Myklebust return -ENOMEM; 117544b83799SFred Isaman } 11766c75dc0dSFred Isaman 1177ea2cf228SFred Isaman nfs_init_cinfo(&cinfo, desc->pg_inode, desc->pg_dreq); 117830dd374fSFred Isaman pages = data->pages.pagevec; 11791da177e4SLinus Torvalds while (!list_empty(head)) { 11801da177e4SLinus Torvalds req = nfs_list_entry(head->next); 11811da177e4SLinus Torvalds nfs_list_remove_request(req); 11826c75dc0dSFred Isaman nfs_list_add_request(req, &hdr->pages); 11831da177e4SLinus Torvalds *pages++ = req->wb_page; 11841da177e4SLinus Torvalds } 11851da177e4SLinus Torvalds 1186b31268acSTrond Myklebust if ((desc->pg_ioflags & FLUSH_COND_STABLE) && 1187ea2cf228SFred Isaman (desc->pg_moreio || nfs_reqs_to_commit(&cinfo))) 1188b31268acSTrond Myklebust desc->pg_ioflags &= ~FLUSH_COND_STABLE; 1189b31268acSTrond Myklebust 11901da177e4SLinus Torvalds /* Set up the argument struct */ 1191ea2cf228SFred Isaman nfs_write_rpcsetup(data, desc->pg_count, 0, desc->pg_ioflags, &cinfo); 11926c75dc0dSFred Isaman list_add(&data->list, &hdr->rpc_list); 11936c75dc0dSFred Isaman desc->pg_rpc_callops = &nfs_write_common_ops; 119425b11dcdSTrond Myklebust return 0; 11951da177e4SLinus Torvalds } 11961da177e4SLinus Torvalds 11976c75dc0dSFred Isaman int nfs_generic_flush(struct nfs_pageio_descriptor *desc, 11986c75dc0dSFred Isaman struct nfs_pgio_header *hdr) 1199dce81290STrond Myklebust { 1200dce81290STrond Myklebust if (desc->pg_bsize < PAGE_CACHE_SIZE) 12016c75dc0dSFred Isaman return nfs_flush_multi(desc, hdr); 12026c75dc0dSFred Isaman return nfs_flush_one(desc, hdr); 1203dce81290STrond Myklebust } 120489d77c8fSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_generic_flush); 1205dce81290STrond Myklebust 1206dce81290STrond Myklebust static int nfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc) 12071751c363STrond Myklebust { 12086c75dc0dSFred Isaman struct nfs_write_header *whdr; 12096c75dc0dSFred Isaman struct nfs_pgio_header *hdr; 1210275acaafSTrond Myklebust int ret; 1211275acaafSTrond Myklebust 12126c75dc0dSFred Isaman whdr = nfs_writehdr_alloc(); 12136c75dc0dSFred Isaman if (!whdr) { 12149b5415b5STrond Myklebust desc->pg_completion_ops->error_cleanup(&desc->pg_list); 12156c75dc0dSFred Isaman return -ENOMEM; 12166c75dc0dSFred Isaman } 12176c75dc0dSFred Isaman hdr = &whdr->header; 12186c75dc0dSFred Isaman nfs_pgheader_init(desc, hdr, nfs_writehdr_free); 12196c75dc0dSFred Isaman atomic_inc(&hdr->refcnt); 12206c75dc0dSFred Isaman ret = nfs_generic_flush(desc, hdr); 1221275acaafSTrond Myklebust if (ret == 0) 12226c75dc0dSFred Isaman ret = nfs_do_multiple_writes(&hdr->rpc_list, 12236c75dc0dSFred Isaman desc->pg_rpc_callops, 1224dce81290STrond Myklebust desc->pg_ioflags); 12256c75dc0dSFred Isaman if (atomic_dec_and_test(&hdr->refcnt)) 1226061ae2edSFred Isaman hdr->completion_ops->completion(hdr); 1227275acaafSTrond Myklebust return ret; 12281751c363STrond Myklebust } 12291751c363STrond Myklebust 12301751c363STrond Myklebust static const struct nfs_pageio_ops nfs_pageio_write_ops = { 12311751c363STrond Myklebust .pg_test = nfs_generic_pg_test, 12321751c363STrond Myklebust .pg_doio = nfs_generic_pg_writepages, 12331751c363STrond Myklebust }; 12341751c363STrond Myklebust 123557208fa7SBryan Schumaker void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, 1236061ae2edSFred Isaman struct inode *inode, int ioflags, 1237061ae2edSFred Isaman const struct nfs_pgio_completion_ops *compl_ops) 12381751c363STrond Myklebust { 1239061ae2edSFred Isaman nfs_pageio_init(pgio, inode, &nfs_pageio_write_ops, compl_ops, 12401751c363STrond Myklebust NFS_SERVER(inode)->wsize, ioflags); 12411751c363STrond Myklebust } 1242ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_pageio_init_write); 12431751c363STrond Myklebust 1244dce81290STrond Myklebust void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio) 1245dce81290STrond Myklebust { 1246dce81290STrond Myklebust pgio->pg_ops = &nfs_pageio_write_ops; 1247dce81290STrond Myklebust pgio->pg_bsize = NFS_SERVER(pgio->pg_inode)->wsize; 1248dce81290STrond Myklebust } 12491f945357STrond Myklebust EXPORT_SYMBOL_GPL(nfs_pageio_reset_write_mds); 1250dce81290STrond Myklebust 12511da177e4SLinus Torvalds 1252def6ed7eSAndy Adamson void nfs_write_prepare(struct rpc_task *task, void *calldata) 1253def6ed7eSAndy Adamson { 1254def6ed7eSAndy Adamson struct nfs_write_data *data = calldata; 1255cd841605SFred Isaman NFS_PROTO(data->header->inode)->write_rpc_prepare(task, data); 1256def6ed7eSAndy Adamson } 1257def6ed7eSAndy Adamson 12580b7c0153SFred Isaman void nfs_commit_prepare(struct rpc_task *task, void *calldata) 12590b7c0153SFred Isaman { 12600b7c0153SFred Isaman struct nfs_commit_data *data = calldata; 12610b7c0153SFred Isaman 12620b7c0153SFred Isaman NFS_PROTO(data->inode)->commit_rpc_prepare(task, data); 12630b7c0153SFred Isaman } 12640b7c0153SFred Isaman 12651da177e4SLinus Torvalds /* 12661da177e4SLinus Torvalds * Handle a write reply that flushes a whole page. 12671da177e4SLinus Torvalds * 12681da177e4SLinus Torvalds * FIXME: There is an inherent race with invalidate_inode_pages and 12691da177e4SLinus Torvalds * writebacks since the page->count is kept > 1 for as long 12701da177e4SLinus Torvalds * as the page has a write request pending. 12711da177e4SLinus Torvalds */ 12726c75dc0dSFred Isaman static void nfs_writeback_done_common(struct rpc_task *task, void *calldata) 12731da177e4SLinus Torvalds { 1274788e7a89STrond Myklebust struct nfs_write_data *data = calldata; 12751da177e4SLinus Torvalds 1276c9d8f89dSTrond Myklebust nfs_writeback_done(task, data); 1277c9d8f89dSTrond Myklebust } 1278c9d8f89dSTrond Myklebust 12796c75dc0dSFred Isaman static void nfs_writeback_release_common(void *calldata) 1280c9d8f89dSTrond Myklebust { 1281c9d8f89dSTrond Myklebust struct nfs_write_data *data = calldata; 1282cd841605SFred Isaman struct nfs_pgio_header *hdr = data->header; 1283e2fecb21STrond Myklebust int status = data->task.tk_status; 1284788e7a89STrond Myklebust 12856c75dc0dSFred Isaman if ((status >= 0) && nfs_write_need_commit(data)) { 12866c75dc0dSFred Isaman spin_lock(&hdr->lock); 12876c75dc0dSFred Isaman if (test_bit(NFS_IOHDR_NEED_RESCHED, &hdr->flags)) 12886c75dc0dSFred Isaman ; /* Do nothing */ 12896c75dc0dSFred Isaman else if (!test_and_set_bit(NFS_IOHDR_NEED_COMMIT, &hdr->flags)) 12909bce008bSTrond Myklebust memcpy(hdr->verf, &data->verf, sizeof(*hdr->verf)); 12919bce008bSTrond Myklebust else if (memcmp(hdr->verf, &data->verf, sizeof(*hdr->verf))) 12926c75dc0dSFred Isaman set_bit(NFS_IOHDR_NEED_RESCHED, &hdr->flags); 12936c75dc0dSFred Isaman spin_unlock(&hdr->lock); 12941da177e4SLinus Torvalds } 1295cd841605SFred Isaman nfs_writedata_release(data); 12961da177e4SLinus Torvalds } 12971da177e4SLinus Torvalds 12986c75dc0dSFred Isaman static const struct rpc_call_ops nfs_write_common_ops = { 1299def6ed7eSAndy Adamson .rpc_call_prepare = nfs_write_prepare, 13006c75dc0dSFred Isaman .rpc_call_done = nfs_writeback_done_common, 13016c75dc0dSFred Isaman .rpc_release = nfs_writeback_release_common, 1302788e7a89STrond Myklebust }; 1303788e7a89STrond Myklebust 1304788e7a89STrond Myklebust 13051da177e4SLinus Torvalds /* 13061da177e4SLinus Torvalds * This function is called when the WRITE call is complete. 13071da177e4SLinus Torvalds */ 130813602896SFred Isaman void nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data) 13091da177e4SLinus Torvalds { 13101da177e4SLinus Torvalds struct nfs_writeargs *argp = &data->args; 13111da177e4SLinus Torvalds struct nfs_writeres *resp = &data->res; 1312cd841605SFred Isaman struct inode *inode = data->header->inode; 1313788e7a89STrond Myklebust int status; 13141da177e4SLinus Torvalds 1315a3f565b1SChuck Lever dprintk("NFS: %5u nfs_writeback_done (status %d)\n", 13161da177e4SLinus Torvalds task->tk_pid, task->tk_status); 13171da177e4SLinus Torvalds 1318f551e44fSChuck Lever /* 1319f551e44fSChuck Lever * ->write_done will attempt to use post-op attributes to detect 1320f551e44fSChuck Lever * conflicting writes by other clients. A strict interpretation 1321f551e44fSChuck Lever * of close-to-open would allow us to continue caching even if 1322f551e44fSChuck Lever * another writer had changed the file, but some applications 1323f551e44fSChuck Lever * depend on tighter cache coherency when writing. 1324f551e44fSChuck Lever */ 1325cd841605SFred Isaman status = NFS_PROTO(inode)->write_done(task, data); 1326788e7a89STrond Myklebust if (status != 0) 132713602896SFred Isaman return; 1328cd841605SFred Isaman nfs_add_stats(inode, NFSIOS_SERVERWRITTENBYTES, resp->count); 132991d5b470SChuck Lever 133089d77c8fSBryan Schumaker #if IS_ENABLED(CONFIG_NFS_V3) || IS_ENABLED(CONFIG_NFS_V4) 13311da177e4SLinus Torvalds if (resp->verf->committed < argp->stable && task->tk_status >= 0) { 13321da177e4SLinus Torvalds /* We tried a write call, but the server did not 13331da177e4SLinus Torvalds * commit data to stable storage even though we 13341da177e4SLinus Torvalds * requested it. 13351da177e4SLinus Torvalds * Note: There is a known bug in Tru64 < 5.0 in which 13361da177e4SLinus Torvalds * the server reports NFS_DATA_SYNC, but performs 13371da177e4SLinus Torvalds * NFS_FILE_SYNC. We therefore implement this checking 13381da177e4SLinus Torvalds * as a dprintk() in order to avoid filling syslog. 13391da177e4SLinus Torvalds */ 13401da177e4SLinus Torvalds static unsigned long complain; 13411da177e4SLinus Torvalds 1342a69aef14SFred Isaman /* Note this will print the MDS for a DS write */ 13431da177e4SLinus Torvalds if (time_before(complain, jiffies)) { 13441da177e4SLinus Torvalds dprintk("NFS: faulty NFS server %s:" 13451da177e4SLinus Torvalds " (committed = %d) != (stable = %d)\n", 1346cd841605SFred Isaman NFS_SERVER(inode)->nfs_client->cl_hostname, 13471da177e4SLinus Torvalds resp->verf->committed, argp->stable); 13481da177e4SLinus Torvalds complain = jiffies + 300 * HZ; 13491da177e4SLinus Torvalds } 13501da177e4SLinus Torvalds } 13511da177e4SLinus Torvalds #endif 13526c75dc0dSFred Isaman if (task->tk_status < 0) 13536c75dc0dSFred Isaman nfs_set_pgio_error(data->header, task->tk_status, argp->offset); 13546c75dc0dSFred Isaman else if (resp->count < argp->count) { 13551da177e4SLinus Torvalds static unsigned long complain; 13561da177e4SLinus Torvalds 13576c75dc0dSFred Isaman /* This a short write! */ 1358cd841605SFred Isaman nfs_inc_stats(inode, NFSIOS_SHORTWRITE); 135991d5b470SChuck Lever 13601da177e4SLinus Torvalds /* Has the server at least made some progress? */ 13616c75dc0dSFred Isaman if (resp->count == 0) { 13626c75dc0dSFred Isaman if (time_before(complain, jiffies)) { 13636c75dc0dSFred Isaman printk(KERN_WARNING 13646c75dc0dSFred Isaman "NFS: Server wrote zero bytes, expected %u.\n", 13656c75dc0dSFred Isaman argp->count); 13666c75dc0dSFred Isaman complain = jiffies + 300 * HZ; 13676c75dc0dSFred Isaman } 13686c75dc0dSFred Isaman nfs_set_pgio_error(data->header, -EIO, argp->offset); 13696c75dc0dSFred Isaman task->tk_status = -EIO; 13706c75dc0dSFred Isaman return; 13716c75dc0dSFred Isaman } 13721da177e4SLinus Torvalds /* Was this an NFSv2 write or an NFSv3 stable write? */ 13731da177e4SLinus Torvalds if (resp->verf->committed != NFS_UNSTABLE) { 13741da177e4SLinus Torvalds /* Resend from where the server left off */ 1375a69aef14SFred Isaman data->mds_offset += resp->count; 13761da177e4SLinus Torvalds argp->offset += resp->count; 13771da177e4SLinus Torvalds argp->pgbase += resp->count; 13781da177e4SLinus Torvalds argp->count -= resp->count; 13791da177e4SLinus Torvalds } else { 13801da177e4SLinus Torvalds /* Resend as a stable write in order to avoid 13811da177e4SLinus Torvalds * headaches in the case of a server crash. 13821da177e4SLinus Torvalds */ 13831da177e4SLinus Torvalds argp->stable = NFS_FILE_SYNC; 13841da177e4SLinus Torvalds } 1385d00c5d43STrond Myklebust rpc_restart_call_prepare(task); 13861da177e4SLinus Torvalds } 13871da177e4SLinus Torvalds } 13881da177e4SLinus Torvalds 13891da177e4SLinus Torvalds 139089d77c8fSBryan Schumaker #if IS_ENABLED(CONFIG_NFS_V3) || IS_ENABLED(CONFIG_NFS_V4) 139171d0a611STrond Myklebust static int nfs_commit_set_lock(struct nfs_inode *nfsi, int may_wait) 139271d0a611STrond Myklebust { 1393b8413f98STrond Myklebust int ret; 1394b8413f98STrond Myklebust 139571d0a611STrond Myklebust if (!test_and_set_bit(NFS_INO_COMMIT, &nfsi->flags)) 139671d0a611STrond Myklebust return 1; 1397b8413f98STrond Myklebust if (!may_wait) 139871d0a611STrond Myklebust return 0; 1399b8413f98STrond Myklebust ret = out_of_line_wait_on_bit_lock(&nfsi->flags, 1400b8413f98STrond Myklebust NFS_INO_COMMIT, 1401b8413f98STrond Myklebust nfs_wait_bit_killable, 1402b8413f98STrond Myklebust TASK_KILLABLE); 1403b8413f98STrond Myklebust return (ret < 0) ? ret : 1; 140471d0a611STrond Myklebust } 140571d0a611STrond Myklebust 1406f453a54aSFred Isaman static void nfs_commit_clear_lock(struct nfs_inode *nfsi) 140771d0a611STrond Myklebust { 140871d0a611STrond Myklebust clear_bit(NFS_INO_COMMIT, &nfsi->flags); 140971d0a611STrond Myklebust smp_mb__after_clear_bit(); 141071d0a611STrond Myklebust wake_up_bit(&nfsi->flags, NFS_INO_COMMIT); 141171d0a611STrond Myklebust } 141271d0a611STrond Myklebust 14130b7c0153SFred Isaman void nfs_commitdata_release(struct nfs_commit_data *data) 14141da177e4SLinus Torvalds { 14150b7c0153SFred Isaman put_nfs_open_context(data->context); 14160b7c0153SFred Isaman nfs_commit_free(data); 14171da177e4SLinus Torvalds } 1418e0c2b380SFred Isaman EXPORT_SYMBOL_GPL(nfs_commitdata_release); 14191da177e4SLinus Torvalds 14200b7c0153SFred Isaman int nfs_initiate_commit(struct rpc_clnt *clnt, struct nfs_commit_data *data, 14219ace33cdSFred Isaman const struct rpc_call_ops *call_ops, 14229f0ec176SAndy Adamson int how, int flags) 14231da177e4SLinus Torvalds { 142407737691STrond Myklebust struct rpc_task *task; 14259ace33cdSFred Isaman int priority = flush_task_priority(how); 1426bdc7f021STrond Myklebust struct rpc_message msg = { 1427bdc7f021STrond Myklebust .rpc_argp = &data->args, 1428bdc7f021STrond Myklebust .rpc_resp = &data->res, 14299ace33cdSFred Isaman .rpc_cred = data->cred, 1430bdc7f021STrond Myklebust }; 143184115e1cSTrond Myklebust struct rpc_task_setup task_setup_data = { 143207737691STrond Myklebust .task = &data->task, 14339ace33cdSFred Isaman .rpc_client = clnt, 1434bdc7f021STrond Myklebust .rpc_message = &msg, 14359ace33cdSFred Isaman .callback_ops = call_ops, 143684115e1cSTrond Myklebust .callback_data = data, 1437101070caSTrond Myklebust .workqueue = nfsiod_workqueue, 14389f0ec176SAndy Adamson .flags = RPC_TASK_ASYNC | flags, 14393ff7576dSTrond Myklebust .priority = priority, 144084115e1cSTrond Myklebust }; 1441788e7a89STrond Myklebust /* Set up the initial task struct. */ 14429ace33cdSFred Isaman NFS_PROTO(data->inode)->commit_setup(data, &msg); 14431da177e4SLinus Torvalds 1444a3f565b1SChuck Lever dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid); 1445bdc7f021STrond Myklebust 144607737691STrond Myklebust task = rpc_run_task(&task_setup_data); 1447dbae4c73STrond Myklebust if (IS_ERR(task)) 1448dbae4c73STrond Myklebust return PTR_ERR(task); 1449d2224e7aSJeff Layton if (how & FLUSH_SYNC) 1450d2224e7aSJeff Layton rpc_wait_for_completion_task(task); 145107737691STrond Myklebust rpc_put_task(task); 1452dbae4c73STrond Myklebust return 0; 14531da177e4SLinus Torvalds } 1454e0c2b380SFred Isaman EXPORT_SYMBOL_GPL(nfs_initiate_commit); 14551da177e4SLinus Torvalds 14561da177e4SLinus Torvalds /* 14579ace33cdSFred Isaman * Set up the argument/result storage required for the RPC call. 14589ace33cdSFred Isaman */ 14590b7c0153SFred Isaman void nfs_init_commit(struct nfs_commit_data *data, 1460988b6dceSFred Isaman struct list_head *head, 1461f453a54aSFred Isaman struct pnfs_layout_segment *lseg, 1462f453a54aSFred Isaman struct nfs_commit_info *cinfo) 14639ace33cdSFred Isaman { 14649ace33cdSFred Isaman struct nfs_page *first = nfs_list_entry(head->next); 14653d4ff43dSAl Viro struct inode *inode = first->wb_context->dentry->d_inode; 14669ace33cdSFred Isaman 14679ace33cdSFred Isaman /* Set up the RPC argument and reply structs 14689ace33cdSFred Isaman * NB: take care not to mess about with data->commit et al. */ 14699ace33cdSFred Isaman 14709ace33cdSFred Isaman list_splice_init(head, &data->pages); 14719ace33cdSFred Isaman 14729ace33cdSFred Isaman data->inode = inode; 14739ace33cdSFred Isaman data->cred = first->wb_context->cred; 1474988b6dceSFred Isaman data->lseg = lseg; /* reference transferred */ 14759ace33cdSFred Isaman data->mds_ops = &nfs_commit_ops; 1476f453a54aSFred Isaman data->completion_ops = cinfo->completion_ops; 1477b359f9d0SFred Isaman data->dreq = cinfo->dreq; 14789ace33cdSFred Isaman 14799ace33cdSFred Isaman data->args.fh = NFS_FH(data->inode); 14809ace33cdSFred Isaman /* Note: we always request a commit of the entire inode */ 14819ace33cdSFred Isaman data->args.offset = 0; 14829ace33cdSFred Isaman data->args.count = 0; 14830b7c0153SFred Isaman data->context = get_nfs_open_context(first->wb_context); 14849ace33cdSFred Isaman data->res.fattr = &data->fattr; 14859ace33cdSFred Isaman data->res.verf = &data->verf; 14869ace33cdSFred Isaman nfs_fattr_init(&data->fattr); 14879ace33cdSFred Isaman } 1488e0c2b380SFred Isaman EXPORT_SYMBOL_GPL(nfs_init_commit); 14899ace33cdSFred Isaman 1490e0c2b380SFred Isaman void nfs_retry_commit(struct list_head *page_list, 1491ea2cf228SFred Isaman struct pnfs_layout_segment *lseg, 1492ea2cf228SFred Isaman struct nfs_commit_info *cinfo) 149364bfeb49SFred Isaman { 149464bfeb49SFred Isaman struct nfs_page *req; 149564bfeb49SFred Isaman 149664bfeb49SFred Isaman while (!list_empty(page_list)) { 149764bfeb49SFred Isaman req = nfs_list_entry(page_list->next); 149864bfeb49SFred Isaman nfs_list_remove_request(req); 1499ea2cf228SFred Isaman nfs_mark_request_commit(req, lseg, cinfo); 150056f9cd68SFred Isaman if (!cinfo->dreq) { 150164bfeb49SFred Isaman dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); 1502d56b4ddfSMel Gorman dec_bdi_stat(page_file_mapping(req->wb_page)->backing_dev_info, 150364bfeb49SFred Isaman BDI_RECLAIMABLE); 150456f9cd68SFred Isaman } 15051d1afcbcSTrond Myklebust nfs_unlock_and_release_request(req); 150664bfeb49SFred Isaman } 150764bfeb49SFred Isaman } 1508e0c2b380SFred Isaman EXPORT_SYMBOL_GPL(nfs_retry_commit); 150964bfeb49SFred Isaman 15109ace33cdSFred Isaman /* 15111da177e4SLinus Torvalds * Commit dirty pages 15121da177e4SLinus Torvalds */ 15131da177e4SLinus Torvalds static int 1514ea2cf228SFred Isaman nfs_commit_list(struct inode *inode, struct list_head *head, int how, 1515ea2cf228SFred Isaman struct nfs_commit_info *cinfo) 15161da177e4SLinus Torvalds { 15170b7c0153SFred Isaman struct nfs_commit_data *data; 15181da177e4SLinus Torvalds 1519c9d8f89dSTrond Myklebust data = nfs_commitdata_alloc(); 15201da177e4SLinus Torvalds 15211da177e4SLinus Torvalds if (!data) 15221da177e4SLinus Torvalds goto out_bad; 15231da177e4SLinus Torvalds 15241da177e4SLinus Torvalds /* Set up the argument struct */ 1525f453a54aSFred Isaman nfs_init_commit(data, head, NULL, cinfo); 1526f453a54aSFred Isaman atomic_inc(&cinfo->mds->rpcs_out); 15279f0ec176SAndy Adamson return nfs_initiate_commit(NFS_CLIENT(inode), data, data->mds_ops, 15289f0ec176SAndy Adamson how, 0); 15291da177e4SLinus Torvalds out_bad: 1530ea2cf228SFred Isaman nfs_retry_commit(head, NULL, cinfo); 1531f453a54aSFred Isaman cinfo->completion_ops->error_cleanup(NFS_I(inode)); 15321da177e4SLinus Torvalds return -ENOMEM; 15331da177e4SLinus Torvalds } 15341da177e4SLinus Torvalds 15351da177e4SLinus Torvalds /* 15361da177e4SLinus Torvalds * COMMIT call returned 15371da177e4SLinus Torvalds */ 1538788e7a89STrond Myklebust static void nfs_commit_done(struct rpc_task *task, void *calldata) 15391da177e4SLinus Torvalds { 15400b7c0153SFred Isaman struct nfs_commit_data *data = calldata; 15411da177e4SLinus Torvalds 1542a3f565b1SChuck Lever dprintk("NFS: %5u nfs_commit_done (status %d)\n", 15431da177e4SLinus Torvalds task->tk_pid, task->tk_status); 15441da177e4SLinus Torvalds 1545788e7a89STrond Myklebust /* Call the NFS version-specific code */ 1546c0d0e96bSTrond Myklebust NFS_PROTO(data->inode)->commit_done(task, data); 1547c9d8f89dSTrond Myklebust } 1548c9d8f89dSTrond Myklebust 1549f453a54aSFred Isaman static void nfs_commit_release_pages(struct nfs_commit_data *data) 1550c9d8f89dSTrond Myklebust { 1551c9d8f89dSTrond Myklebust struct nfs_page *req; 1552c9d8f89dSTrond Myklebust int status = data->task.tk_status; 1553f453a54aSFred Isaman struct nfs_commit_info cinfo; 1554788e7a89STrond Myklebust 15551da177e4SLinus Torvalds while (!list_empty(&data->pages)) { 15561da177e4SLinus Torvalds req = nfs_list_entry(data->pages.next); 15571da177e4SLinus Torvalds nfs_list_remove_request(req); 1558d6d6dc7cSFred Isaman nfs_clear_page_commit(req->wb_page); 15591da177e4SLinus Torvalds 156048186c7dSChuck Lever dprintk("NFS: commit (%s/%lld %d@%lld)", 15613d4ff43dSAl Viro req->wb_context->dentry->d_sb->s_id, 15623d4ff43dSAl Viro (long long)NFS_FILEID(req->wb_context->dentry->d_inode), 15631da177e4SLinus Torvalds req->wb_bytes, 15641da177e4SLinus Torvalds (long long)req_offset(req)); 1565c9d8f89dSTrond Myklebust if (status < 0) { 1566c9d8f89dSTrond Myklebust nfs_context_set_write_error(req->wb_context, status); 15671da177e4SLinus Torvalds nfs_inode_remove_request(req); 1568c9d8f89dSTrond Myklebust dprintk(", error = %d\n", status); 15691da177e4SLinus Torvalds goto next; 15701da177e4SLinus Torvalds } 15711da177e4SLinus Torvalds 15721da177e4SLinus Torvalds /* Okay, COMMIT succeeded, apparently. Check the verifier 15731da177e4SLinus Torvalds * returned by the server against all stored verfs. */ 15742f2c63bcSTrond Myklebust if (!memcmp(&req->wb_verf, &data->verf.verifier, sizeof(req->wb_verf))) { 15751da177e4SLinus Torvalds /* We have a match */ 15761da177e4SLinus Torvalds nfs_inode_remove_request(req); 15771da177e4SLinus Torvalds dprintk(" OK\n"); 15781da177e4SLinus Torvalds goto next; 15791da177e4SLinus Torvalds } 15801da177e4SLinus Torvalds /* We have a mismatch. Write the page again */ 15811da177e4SLinus Torvalds dprintk(" mismatch\n"); 15826d884e8fSFred nfs_mark_request_dirty(req); 15831da177e4SLinus Torvalds next: 15841d1afcbcSTrond Myklebust nfs_unlock_and_release_request(req); 15851da177e4SLinus Torvalds } 1586f453a54aSFred Isaman nfs_init_cinfo(&cinfo, data->inode, data->dreq); 1587f453a54aSFred Isaman if (atomic_dec_and_test(&cinfo.mds->rpcs_out)) 1588f453a54aSFred Isaman nfs_commit_clear_lock(NFS_I(data->inode)); 15895917ce84SFred Isaman } 15905917ce84SFred Isaman 15915917ce84SFred Isaman static void nfs_commit_release(void *calldata) 15925917ce84SFred Isaman { 15930b7c0153SFred Isaman struct nfs_commit_data *data = calldata; 15945917ce84SFred Isaman 1595f453a54aSFred Isaman data->completion_ops->completion(data); 1596c9d8f89dSTrond Myklebust nfs_commitdata_release(calldata); 15971da177e4SLinus Torvalds } 1598788e7a89STrond Myklebust 1599788e7a89STrond Myklebust static const struct rpc_call_ops nfs_commit_ops = { 16000b7c0153SFred Isaman .rpc_call_prepare = nfs_commit_prepare, 1601788e7a89STrond Myklebust .rpc_call_done = nfs_commit_done, 1602788e7a89STrond Myklebust .rpc_release = nfs_commit_release, 1603788e7a89STrond Myklebust }; 16041da177e4SLinus Torvalds 1605f453a54aSFred Isaman static const struct nfs_commit_completion_ops nfs_commit_completion_ops = { 1606f453a54aSFred Isaman .completion = nfs_commit_release_pages, 1607f453a54aSFred Isaman .error_cleanup = nfs_commit_clear_lock, 1608f453a54aSFred Isaman }; 1609f453a54aSFred Isaman 16101763da12SFred Isaman int nfs_generic_commit_list(struct inode *inode, struct list_head *head, 1611ea2cf228SFred Isaman int how, struct nfs_commit_info *cinfo) 161284c53ab5SFred Isaman { 161384c53ab5SFred Isaman int status; 161484c53ab5SFred Isaman 1615ea2cf228SFred Isaman status = pnfs_commit_list(inode, head, how, cinfo); 161684c53ab5SFred Isaman if (status == PNFS_NOT_ATTEMPTED) 1617ea2cf228SFred Isaman status = nfs_commit_list(inode, head, how, cinfo); 161884c53ab5SFred Isaman return status; 161984c53ab5SFred Isaman } 162084c53ab5SFred Isaman 1621b608b283STrond Myklebust int nfs_commit_inode(struct inode *inode, int how) 16221da177e4SLinus Torvalds { 16231da177e4SLinus Torvalds LIST_HEAD(head); 1624ea2cf228SFred Isaman struct nfs_commit_info cinfo; 162571d0a611STrond Myklebust int may_wait = how & FLUSH_SYNC; 1626b8413f98STrond Myklebust int res; 16271da177e4SLinus Torvalds 1628b8413f98STrond Myklebust res = nfs_commit_set_lock(NFS_I(inode), may_wait); 1629b8413f98STrond Myklebust if (res <= 0) 1630c5efa5fcSTrond Myklebust goto out_mark_dirty; 1631ea2cf228SFred Isaman nfs_init_cinfo_from_inode(&cinfo, inode); 1632ea2cf228SFred Isaman res = nfs_scan_commit(inode, &head, &cinfo); 16331da177e4SLinus Torvalds if (res) { 1634a861a1e1SFred Isaman int error; 1635a861a1e1SFred Isaman 1636ea2cf228SFred Isaman error = nfs_generic_commit_list(inode, &head, how, &cinfo); 16371da177e4SLinus Torvalds if (error < 0) 16381da177e4SLinus Torvalds return error; 1639b8413f98STrond Myklebust if (!may_wait) 1640b8413f98STrond Myklebust goto out_mark_dirty; 1641b8413f98STrond Myklebust error = wait_on_bit(&NFS_I(inode)->flags, 1642b8413f98STrond Myklebust NFS_INO_COMMIT, 164371d0a611STrond Myklebust nfs_wait_bit_killable, 164471d0a611STrond Myklebust TASK_KILLABLE); 1645b8413f98STrond Myklebust if (error < 0) 1646b8413f98STrond Myklebust return error; 164771d0a611STrond Myklebust } else 164871d0a611STrond Myklebust nfs_commit_clear_lock(NFS_I(inode)); 1649c5efa5fcSTrond Myklebust return res; 1650c5efa5fcSTrond Myklebust /* Note: If we exit without ensuring that the commit is complete, 1651c5efa5fcSTrond Myklebust * we must mark the inode as dirty. Otherwise, future calls to 1652c5efa5fcSTrond Myklebust * sync_inode() with the WB_SYNC_ALL flag set will fail to ensure 1653c5efa5fcSTrond Myklebust * that the data is on the disk. 1654c5efa5fcSTrond Myklebust */ 1655c5efa5fcSTrond Myklebust out_mark_dirty: 1656c5efa5fcSTrond Myklebust __mark_inode_dirty(inode, I_DIRTY_DATASYNC); 16571da177e4SLinus Torvalds return res; 16581da177e4SLinus Torvalds } 16598fc795f7STrond Myklebust 16608fc795f7STrond Myklebust static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_control *wbc) 16618fc795f7STrond Myklebust { 1662420e3646STrond Myklebust struct nfs_inode *nfsi = NFS_I(inode); 1663420e3646STrond Myklebust int flags = FLUSH_SYNC; 1664420e3646STrond Myklebust int ret = 0; 16658fc795f7STrond Myklebust 16663236c3e1SJeff Layton /* no commits means nothing needs to be done */ 1667ea2cf228SFred Isaman if (!nfsi->commit_info.ncommit) 16683236c3e1SJeff Layton return ret; 16693236c3e1SJeff Layton 1670a00dd6c0SJeff Layton if (wbc->sync_mode == WB_SYNC_NONE) { 1671a00dd6c0SJeff Layton /* Don't commit yet if this is a non-blocking flush and there 1672a00dd6c0SJeff Layton * are a lot of outstanding writes for this mapping. 1673420e3646STrond Myklebust */ 1674ea2cf228SFred Isaman if (nfsi->commit_info.ncommit <= (nfsi->npages >> 1)) 1675420e3646STrond Myklebust goto out_mark_dirty; 1676420e3646STrond Myklebust 1677a00dd6c0SJeff Layton /* don't wait for the COMMIT response */ 1678420e3646STrond Myklebust flags = 0; 1679a00dd6c0SJeff Layton } 1680a00dd6c0SJeff Layton 1681420e3646STrond Myklebust ret = nfs_commit_inode(inode, flags); 1682420e3646STrond Myklebust if (ret >= 0) { 1683420e3646STrond Myklebust if (wbc->sync_mode == WB_SYNC_NONE) { 1684420e3646STrond Myklebust if (ret < wbc->nr_to_write) 1685420e3646STrond Myklebust wbc->nr_to_write -= ret; 1686420e3646STrond Myklebust else 1687420e3646STrond Myklebust wbc->nr_to_write = 0; 1688420e3646STrond Myklebust } 16898fc795f7STrond Myklebust return 0; 1690420e3646STrond Myklebust } 1691420e3646STrond Myklebust out_mark_dirty: 16928fc795f7STrond Myklebust __mark_inode_dirty(inode, I_DIRTY_DATASYNC); 16938fc795f7STrond Myklebust return ret; 16948fc795f7STrond Myklebust } 1695c63c7b05STrond Myklebust #else 16968fc795f7STrond Myklebust static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_control *wbc) 16978fc795f7STrond Myklebust { 16988fc795f7STrond Myklebust return 0; 16998fc795f7STrond Myklebust } 17001da177e4SLinus Torvalds #endif 17011da177e4SLinus Torvalds 17028fc795f7STrond Myklebust int nfs_write_inode(struct inode *inode, struct writeback_control *wbc) 17038fc795f7STrond Myklebust { 1704a8d8f02cSBryan Schumaker return nfs_commit_unstable_pages(inode, wbc); 1705a8d8f02cSBryan Schumaker } 170689d77c8fSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_write_inode); 1707863a3c6cSAndy Adamson 1708acdc53b2STrond Myklebust /* 1709acdc53b2STrond Myklebust * flush the inode to disk. 1710acdc53b2STrond Myklebust */ 1711acdc53b2STrond Myklebust int nfs_wb_all(struct inode *inode) 171234901f70STrond Myklebust { 171334901f70STrond Myklebust struct writeback_control wbc = { 171472cb77f4STrond Myklebust .sync_mode = WB_SYNC_ALL, 171534901f70STrond Myklebust .nr_to_write = LONG_MAX, 1716d7fb1207STrond Myklebust .range_start = 0, 1717d7fb1207STrond Myklebust .range_end = LLONG_MAX, 171834901f70STrond Myklebust }; 171934901f70STrond Myklebust 1720acdc53b2STrond Myklebust return sync_inode(inode, &wbc); 17211c75950bSTrond Myklebust } 1722ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_wb_all); 17231c75950bSTrond Myklebust 17241b3b4a1aSTrond Myklebust int nfs_wb_page_cancel(struct inode *inode, struct page *page) 17251b3b4a1aSTrond Myklebust { 17261b3b4a1aSTrond Myklebust struct nfs_page *req; 17271b3b4a1aSTrond Myklebust int ret = 0; 17281b3b4a1aSTrond Myklebust 17291b3b4a1aSTrond Myklebust BUG_ON(!PageLocked(page)); 17301b3b4a1aSTrond Myklebust for (;;) { 1731ba8b06e6STrond Myklebust wait_on_page_writeback(page); 17321b3b4a1aSTrond Myklebust req = nfs_page_find_request(page); 17331b3b4a1aSTrond Myklebust if (req == NULL) 17341b3b4a1aSTrond Myklebust break; 17357ad84aa9STrond Myklebust if (nfs_lock_request(req)) { 17368dd37758STrond Myklebust nfs_clear_request_commit(req); 17371b3b4a1aSTrond Myklebust nfs_inode_remove_request(req); 17381b3b4a1aSTrond Myklebust /* 17391b3b4a1aSTrond Myklebust * In case nfs_inode_remove_request has marked the 17401b3b4a1aSTrond Myklebust * page as being dirty 17411b3b4a1aSTrond Myklebust */ 17421b3b4a1aSTrond Myklebust cancel_dirty_page(page, PAGE_CACHE_SIZE); 17431d1afcbcSTrond Myklebust nfs_unlock_and_release_request(req); 17441b3b4a1aSTrond Myklebust break; 17451b3b4a1aSTrond Myklebust } 17461b3b4a1aSTrond Myklebust ret = nfs_wait_on_request(req); 1747c9edda71STrond Myklebust nfs_release_request(req); 17481b3b4a1aSTrond Myklebust if (ret < 0) 1749c988950eSTrond Myklebust break; 17501b3b4a1aSTrond Myklebust } 17511b3b4a1aSTrond Myklebust return ret; 17521b3b4a1aSTrond Myklebust } 17531b3b4a1aSTrond Myklebust 17541c75950bSTrond Myklebust /* 17551c75950bSTrond Myklebust * Write back all requests on one page - we do this before reading it. 17561c75950bSTrond Myklebust */ 17571c75950bSTrond Myklebust int nfs_wb_page(struct inode *inode, struct page *page) 17581c75950bSTrond Myklebust { 175929418aa4SMel Gorman loff_t range_start = page_file_offset(page); 17607f2f12d9STrond Myklebust loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); 17617f2f12d9STrond Myklebust struct writeback_control wbc = { 17627f2f12d9STrond Myklebust .sync_mode = WB_SYNC_ALL, 17637f2f12d9STrond Myklebust .nr_to_write = 0, 17647f2f12d9STrond Myklebust .range_start = range_start, 17657f2f12d9STrond Myklebust .range_end = range_end, 17667f2f12d9STrond Myklebust }; 17677f2f12d9STrond Myklebust int ret; 17687f2f12d9STrond Myklebust 17690522f6adSTrond Myklebust for (;;) { 1770ba8b06e6STrond Myklebust wait_on_page_writeback(page); 17717f2f12d9STrond Myklebust if (clear_page_dirty_for_io(page)) { 17727f2f12d9STrond Myklebust ret = nfs_writepage_locked(page, &wbc); 17737f2f12d9STrond Myklebust if (ret < 0) 17747f2f12d9STrond Myklebust goto out_error; 17750522f6adSTrond Myklebust continue; 17767f2f12d9STrond Myklebust } 17770522f6adSTrond Myklebust if (!PagePrivate(page)) 17780522f6adSTrond Myklebust break; 17790522f6adSTrond Myklebust ret = nfs_commit_inode(inode, FLUSH_SYNC); 17807f2f12d9STrond Myklebust if (ret < 0) 17817f2f12d9STrond Myklebust goto out_error; 17827f2f12d9STrond Myklebust } 17837f2f12d9STrond Myklebust return 0; 17847f2f12d9STrond Myklebust out_error: 17857f2f12d9STrond Myklebust return ret; 17861c75950bSTrond Myklebust } 17871c75950bSTrond Myklebust 1788074cc1deSTrond Myklebust #ifdef CONFIG_MIGRATION 1789074cc1deSTrond Myklebust int nfs_migrate_page(struct address_space *mapping, struct page *newpage, 1790a6bc32b8SMel Gorman struct page *page, enum migrate_mode mode) 1791074cc1deSTrond Myklebust { 17922da95652SJeff Layton /* 17932da95652SJeff Layton * If PagePrivate is set, then the page is currently associated with 17942da95652SJeff Layton * an in-progress read or write request. Don't try to migrate it. 17952da95652SJeff Layton * 17962da95652SJeff Layton * FIXME: we could do this in principle, but we'll need a way to ensure 17972da95652SJeff Layton * that we can safely release the inode reference while holding 17982da95652SJeff Layton * the page lock. 17992da95652SJeff Layton */ 18002da95652SJeff Layton if (PagePrivate(page)) 18012da95652SJeff Layton return -EBUSY; 1802074cc1deSTrond Myklebust 1803074cc1deSTrond Myklebust nfs_fscache_release_page(page, GFP_KERNEL); 1804074cc1deSTrond Myklebust 1805a6bc32b8SMel Gorman return migrate_page(mapping, newpage, page, mode); 1806074cc1deSTrond Myklebust } 1807074cc1deSTrond Myklebust #endif 1808074cc1deSTrond Myklebust 1809f7b422b1SDavid Howells int __init nfs_init_writepagecache(void) 18101da177e4SLinus Torvalds { 18111da177e4SLinus Torvalds nfs_wdata_cachep = kmem_cache_create("nfs_write_data", 1812cd841605SFred Isaman sizeof(struct nfs_write_header), 18131da177e4SLinus Torvalds 0, SLAB_HWCACHE_ALIGN, 181420c2df83SPaul Mundt NULL); 18151da177e4SLinus Torvalds if (nfs_wdata_cachep == NULL) 18161da177e4SLinus Torvalds return -ENOMEM; 18171da177e4SLinus Torvalds 181893d2341cSMatthew Dobson nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE, 18191da177e4SLinus Torvalds nfs_wdata_cachep); 18201da177e4SLinus Torvalds if (nfs_wdata_mempool == NULL) 18213dd4765fSJeff Layton goto out_destroy_write_cache; 18221da177e4SLinus Torvalds 18230b7c0153SFred Isaman nfs_cdata_cachep = kmem_cache_create("nfs_commit_data", 18240b7c0153SFred Isaman sizeof(struct nfs_commit_data), 18250b7c0153SFred Isaman 0, SLAB_HWCACHE_ALIGN, 18260b7c0153SFred Isaman NULL); 18270b7c0153SFred Isaman if (nfs_cdata_cachep == NULL) 18283dd4765fSJeff Layton goto out_destroy_write_mempool; 18290b7c0153SFred Isaman 183093d2341cSMatthew Dobson nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT, 18311da177e4SLinus Torvalds nfs_wdata_cachep); 18321da177e4SLinus Torvalds if (nfs_commit_mempool == NULL) 18333dd4765fSJeff Layton goto out_destroy_commit_cache; 18341da177e4SLinus Torvalds 183589a09141SPeter Zijlstra /* 183689a09141SPeter Zijlstra * NFS congestion size, scale with available memory. 183789a09141SPeter Zijlstra * 183889a09141SPeter Zijlstra * 64MB: 8192k 183989a09141SPeter Zijlstra * 128MB: 11585k 184089a09141SPeter Zijlstra * 256MB: 16384k 184189a09141SPeter Zijlstra * 512MB: 23170k 184289a09141SPeter Zijlstra * 1GB: 32768k 184389a09141SPeter Zijlstra * 2GB: 46340k 184489a09141SPeter Zijlstra * 4GB: 65536k 184589a09141SPeter Zijlstra * 8GB: 92681k 184689a09141SPeter Zijlstra * 16GB: 131072k 184789a09141SPeter Zijlstra * 184889a09141SPeter Zijlstra * This allows larger machines to have larger/more transfers. 184989a09141SPeter Zijlstra * Limit the default to 256M 185089a09141SPeter Zijlstra */ 185189a09141SPeter Zijlstra nfs_congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); 185289a09141SPeter Zijlstra if (nfs_congestion_kb > 256*1024) 185389a09141SPeter Zijlstra nfs_congestion_kb = 256*1024; 185489a09141SPeter Zijlstra 18551da177e4SLinus Torvalds return 0; 18563dd4765fSJeff Layton 18573dd4765fSJeff Layton out_destroy_commit_cache: 18583dd4765fSJeff Layton kmem_cache_destroy(nfs_cdata_cachep); 18593dd4765fSJeff Layton out_destroy_write_mempool: 18603dd4765fSJeff Layton mempool_destroy(nfs_wdata_mempool); 18613dd4765fSJeff Layton out_destroy_write_cache: 18623dd4765fSJeff Layton kmem_cache_destroy(nfs_wdata_cachep); 18633dd4765fSJeff Layton return -ENOMEM; 18641da177e4SLinus Torvalds } 18651da177e4SLinus Torvalds 1866266bee88SDavid Brownell void nfs_destroy_writepagecache(void) 18671da177e4SLinus Torvalds { 18681da177e4SLinus Torvalds mempool_destroy(nfs_commit_mempool); 18693dd4765fSJeff Layton kmem_cache_destroy(nfs_cdata_cachep); 18701da177e4SLinus Torvalds mempool_destroy(nfs_wdata_mempool); 18711a1d92c1SAlexey Dobriyan kmem_cache_destroy(nfs_wdata_cachep); 18721da177e4SLinus Torvalds } 18731da177e4SLinus Torvalds 1874