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 { 205d56b4ddfSMel Gorman nfs_zap_mapping(page_file_mapping(page)->host, page_file_mapping(page)); 206a301b777STrond Myklebust } 207a301b777STrond Myklebust 2081da177e4SLinus Torvalds /* We can set the PG_uptodate flag if we see that a write request 2091da177e4SLinus Torvalds * covers the full page. 2101da177e4SLinus Torvalds */ 2111da177e4SLinus Torvalds static void nfs_mark_uptodate(struct page *page, unsigned int base, unsigned int count) 2121da177e4SLinus Torvalds { 2131da177e4SLinus Torvalds if (PageUptodate(page)) 2141da177e4SLinus Torvalds return; 2151da177e4SLinus Torvalds if (base != 0) 2161da177e4SLinus Torvalds return; 21749a70f27STrond Myklebust if (count != nfs_page_length(page)) 2181da177e4SLinus Torvalds return; 2191da177e4SLinus Torvalds SetPageUptodate(page); 2201da177e4SLinus Torvalds } 2211da177e4SLinus Torvalds 2221da177e4SLinus Torvalds static int wb_priority(struct writeback_control *wbc) 2231da177e4SLinus Torvalds { 2241da177e4SLinus Torvalds if (wbc->for_reclaim) 225c63c7b05STrond Myklebust return FLUSH_HIGHPRI | FLUSH_STABLE; 226b17621feSWu Fengguang if (wbc->for_kupdate || wbc->for_background) 227b31268acSTrond Myklebust return FLUSH_LOWPRI | FLUSH_COND_STABLE; 228b31268acSTrond Myklebust return FLUSH_COND_STABLE; 2291da177e4SLinus Torvalds } 2301da177e4SLinus Torvalds 2311da177e4SLinus Torvalds /* 23289a09141SPeter Zijlstra * NFS congestion control 23389a09141SPeter Zijlstra */ 23489a09141SPeter Zijlstra 23589a09141SPeter Zijlstra int nfs_congestion_kb; 23689a09141SPeter Zijlstra 23789a09141SPeter Zijlstra #define NFS_CONGESTION_ON_THRESH (nfs_congestion_kb >> (PAGE_SHIFT-10)) 23889a09141SPeter Zijlstra #define NFS_CONGESTION_OFF_THRESH \ 23989a09141SPeter Zijlstra (NFS_CONGESTION_ON_THRESH - (NFS_CONGESTION_ON_THRESH >> 2)) 24089a09141SPeter Zijlstra 241deed85e7STrond Myklebust static void nfs_set_page_writeback(struct page *page) 24289a09141SPeter Zijlstra { 243deed85e7STrond Myklebust struct nfs_server *nfss = NFS_SERVER(page_file_mapping(page)->host); 2445a6d41b3STrond Myklebust int ret = test_set_page_writeback(page); 2455a6d41b3STrond Myklebust 246deed85e7STrond Myklebust WARN_ON_ONCE(ret != 0); 24789a09141SPeter Zijlstra 248277866a0SPeter Zijlstra if (atomic_long_inc_return(&nfss->writeback) > 2498aa7e847SJens Axboe NFS_CONGESTION_ON_THRESH) { 2508aa7e847SJens Axboe set_bdi_congested(&nfss->backing_dev_info, 2518aa7e847SJens Axboe BLK_RW_ASYNC); 2528aa7e847SJens Axboe } 25389a09141SPeter Zijlstra } 25489a09141SPeter Zijlstra 25589a09141SPeter Zijlstra static void nfs_end_page_writeback(struct page *page) 25689a09141SPeter Zijlstra { 257d56b4ddfSMel Gorman struct inode *inode = page_file_mapping(page)->host; 25889a09141SPeter Zijlstra struct nfs_server *nfss = NFS_SERVER(inode); 25989a09141SPeter Zijlstra 26089a09141SPeter Zijlstra end_page_writeback(page); 261c4dc4beeSPeter Zijlstra if (atomic_long_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH) 2628aa7e847SJens Axboe clear_bdi_congested(&nfss->backing_dev_info, BLK_RW_ASYNC); 26389a09141SPeter Zijlstra } 26489a09141SPeter Zijlstra 265cfb506e1STrond Myklebust static struct nfs_page *nfs_find_and_lock_request(struct page *page, bool nonblock) 266e261f51fSTrond Myklebust { 267d56b4ddfSMel Gorman struct inode *inode = page_file_mapping(page)->host; 268e261f51fSTrond Myklebust struct nfs_page *req; 269e261f51fSTrond Myklebust int ret; 270e261f51fSTrond Myklebust 271587142f8STrond Myklebust spin_lock(&inode->i_lock); 272e261f51fSTrond Myklebust for (;;) { 27329418aa4SMel Gorman req = nfs_page_find_request_locked(NFS_I(inode), page); 274074cc1deSTrond Myklebust if (req == NULL) 275074cc1deSTrond Myklebust break; 2767ad84aa9STrond Myklebust if (nfs_lock_request(req)) 277e261f51fSTrond Myklebust break; 278e261f51fSTrond Myklebust /* Note: If we hold the page lock, as is the case in nfs_writepage, 2797ad84aa9STrond Myklebust * then the call to nfs_lock_request() will always 280e261f51fSTrond Myklebust * succeed provided that someone hasn't already marked the 281e261f51fSTrond Myklebust * request as dirty (in which case we don't care). 282e261f51fSTrond Myklebust */ 283587142f8STrond Myklebust spin_unlock(&inode->i_lock); 284cfb506e1STrond Myklebust if (!nonblock) 285e261f51fSTrond Myklebust ret = nfs_wait_on_request(req); 286cfb506e1STrond Myklebust else 287cfb506e1STrond Myklebust ret = -EAGAIN; 288e261f51fSTrond Myklebust nfs_release_request(req); 289e261f51fSTrond Myklebust if (ret != 0) 290074cc1deSTrond Myklebust return ERR_PTR(ret); 291587142f8STrond Myklebust spin_lock(&inode->i_lock); 292e261f51fSTrond Myklebust } 293587142f8STrond Myklebust spin_unlock(&inode->i_lock); 294074cc1deSTrond Myklebust return req; 295612c9384STrond Myklebust } 296074cc1deSTrond Myklebust 297074cc1deSTrond Myklebust /* 298074cc1deSTrond Myklebust * Find an associated nfs write request, and prepare to flush it out 299074cc1deSTrond Myklebust * May return an error if the user signalled nfs_wait_on_request(). 300074cc1deSTrond Myklebust */ 301074cc1deSTrond Myklebust static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio, 302cfb506e1STrond Myklebust struct page *page, bool nonblock) 303074cc1deSTrond Myklebust { 304074cc1deSTrond Myklebust struct nfs_page *req; 305074cc1deSTrond Myklebust int ret = 0; 306074cc1deSTrond Myklebust 307cfb506e1STrond Myklebust req = nfs_find_and_lock_request(page, nonblock); 308074cc1deSTrond Myklebust if (!req) 309074cc1deSTrond Myklebust goto out; 310074cc1deSTrond Myklebust ret = PTR_ERR(req); 311074cc1deSTrond Myklebust if (IS_ERR(req)) 312074cc1deSTrond Myklebust goto out; 313074cc1deSTrond Myklebust 314deed85e7STrond Myklebust nfs_set_page_writeback(page); 315deed85e7STrond Myklebust WARN_ON_ONCE(test_bit(PG_CLEAN, &req->wb_flags)); 316074cc1deSTrond Myklebust 317deed85e7STrond Myklebust ret = 0; 318f8512ad0SFred Isaman if (!nfs_pageio_add_request(pgio, req)) { 319f8512ad0SFred Isaman nfs_redirty_request(req); 320074cc1deSTrond Myklebust ret = pgio->pg_error; 321f8512ad0SFred Isaman } 322074cc1deSTrond Myklebust out: 323074cc1deSTrond Myklebust return ret; 324e261f51fSTrond Myklebust } 325e261f51fSTrond Myklebust 326f758c885STrond Myklebust static int nfs_do_writepage(struct page *page, struct writeback_control *wbc, struct nfs_pageio_descriptor *pgio) 327f758c885STrond Myklebust { 328d56b4ddfSMel Gorman struct inode *inode = page_file_mapping(page)->host; 329cfb506e1STrond Myklebust int ret; 330f758c885STrond Myklebust 331f758c885STrond Myklebust nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE); 332f758c885STrond Myklebust nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1); 333f758c885STrond Myklebust 334d56b4ddfSMel Gorman nfs_pageio_cond_complete(pgio, page_file_index(page)); 3351b430beeSWu Fengguang ret = nfs_page_async_flush(pgio, page, wbc->sync_mode == WB_SYNC_NONE); 336cfb506e1STrond Myklebust if (ret == -EAGAIN) { 337cfb506e1STrond Myklebust redirty_page_for_writepage(wbc, page); 338cfb506e1STrond Myklebust ret = 0; 339cfb506e1STrond Myklebust } 340cfb506e1STrond Myklebust return ret; 341f758c885STrond Myklebust } 342f758c885STrond Myklebust 343e261f51fSTrond Myklebust /* 3441da177e4SLinus Torvalds * Write an mmapped page to the server. 3451da177e4SLinus Torvalds */ 3464d770ccfSTrond Myklebust static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc) 3471da177e4SLinus Torvalds { 348f758c885STrond Myklebust struct nfs_pageio_descriptor pgio; 349e261f51fSTrond Myklebust int err; 3501da177e4SLinus Torvalds 351d56b4ddfSMel Gorman NFS_PROTO(page_file_mapping(page)->host)->write_pageio_init(&pgio, 35257208fa7SBryan Schumaker page->mapping->host, 35357208fa7SBryan Schumaker wb_priority(wbc), 354061ae2edSFred Isaman &nfs_async_write_completion_ops); 355f758c885STrond Myklebust err = nfs_do_writepage(page, wbc, &pgio); 356f758c885STrond Myklebust nfs_pageio_complete(&pgio); 357f758c885STrond Myklebust if (err < 0) 3584d770ccfSTrond Myklebust return err; 359f758c885STrond Myklebust if (pgio.pg_error < 0) 360f758c885STrond Myklebust return pgio.pg_error; 361f758c885STrond Myklebust return 0; 3624d770ccfSTrond Myklebust } 3634d770ccfSTrond Myklebust 3644d770ccfSTrond Myklebust int nfs_writepage(struct page *page, struct writeback_control *wbc) 3654d770ccfSTrond Myklebust { 366f758c885STrond Myklebust int ret; 3674d770ccfSTrond Myklebust 368f758c885STrond Myklebust ret = nfs_writepage_locked(page, wbc); 3691da177e4SLinus Torvalds unlock_page(page); 370f758c885STrond Myklebust return ret; 371f758c885STrond Myklebust } 372f758c885STrond Myklebust 373f758c885STrond Myklebust static int nfs_writepages_callback(struct page *page, struct writeback_control *wbc, void *data) 374f758c885STrond Myklebust { 375f758c885STrond Myklebust int ret; 376f758c885STrond Myklebust 377f758c885STrond Myklebust ret = nfs_do_writepage(page, wbc, data); 378f758c885STrond Myklebust unlock_page(page); 379f758c885STrond Myklebust return ret; 3801da177e4SLinus Torvalds } 3811da177e4SLinus Torvalds 3821da177e4SLinus Torvalds int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc) 3831da177e4SLinus Torvalds { 3841da177e4SLinus Torvalds struct inode *inode = mapping->host; 38572cb77f4STrond Myklebust unsigned long *bitlock = &NFS_I(inode)->flags; 386c63c7b05STrond Myklebust struct nfs_pageio_descriptor pgio; 3871da177e4SLinus Torvalds int err; 3881da177e4SLinus Torvalds 38972cb77f4STrond Myklebust /* Stop dirtying of new pages while we sync */ 39072cb77f4STrond Myklebust err = wait_on_bit_lock(bitlock, NFS_INO_FLUSHING, 39172cb77f4STrond Myklebust nfs_wait_bit_killable, TASK_KILLABLE); 39272cb77f4STrond Myklebust if (err) 39372cb77f4STrond Myklebust goto out_err; 39472cb77f4STrond Myklebust 39591d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES); 39691d5b470SChuck Lever 39757208fa7SBryan Schumaker NFS_PROTO(inode)->write_pageio_init(&pgio, inode, wb_priority(wbc), &nfs_async_write_completion_ops); 398f758c885STrond Myklebust err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio); 399c63c7b05STrond Myklebust nfs_pageio_complete(&pgio); 40072cb77f4STrond Myklebust 40172cb77f4STrond Myklebust clear_bit_unlock(NFS_INO_FLUSHING, bitlock); 40272cb77f4STrond Myklebust smp_mb__after_clear_bit(); 40372cb77f4STrond Myklebust wake_up_bit(bitlock, NFS_INO_FLUSHING); 40472cb77f4STrond Myklebust 405f758c885STrond Myklebust if (err < 0) 40672cb77f4STrond Myklebust goto out_err; 40772cb77f4STrond Myklebust err = pgio.pg_error; 40872cb77f4STrond Myklebust if (err < 0) 40972cb77f4STrond Myklebust goto out_err; 410c63c7b05STrond Myklebust return 0; 41172cb77f4STrond Myklebust out_err: 41272cb77f4STrond Myklebust return err; 4131da177e4SLinus Torvalds } 4141da177e4SLinus Torvalds 4151da177e4SLinus Torvalds /* 4161da177e4SLinus Torvalds * Insert a write request into an inode 4171da177e4SLinus Torvalds */ 418d6d6dc7cSFred Isaman static void nfs_inode_add_request(struct inode *inode, struct nfs_page *req) 4191da177e4SLinus Torvalds { 4201da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 421e7d39069STrond Myklebust 422e7d39069STrond Myklebust /* Lock the request! */ 4237ad84aa9STrond Myklebust nfs_lock_request(req); 424e7d39069STrond Myklebust 425e7d39069STrond Myklebust spin_lock(&inode->i_lock); 426011e2a7fSBryan Schumaker if (!nfsi->npages && NFS_PROTO(inode)->have_delegation(inode, FMODE_WRITE)) 427a9a4a87aSTrond Myklebust inode->i_version++; 42829418aa4SMel Gorman /* 42929418aa4SMel Gorman * Swap-space should not get truncated. Hence no need to plug the race 43029418aa4SMel Gorman * with invalidate/truncate. 43129418aa4SMel Gorman */ 43229418aa4SMel Gorman if (likely(!PageSwapCache(req->wb_page))) { 4332df485a7STrond Myklebust set_bit(PG_MAPPED, &req->wb_flags); 434deb7d638STrond Myklebust SetPagePrivate(req->wb_page); 435277459d2STrond Myklebust set_page_private(req->wb_page, (unsigned long)req); 43629418aa4SMel Gorman } 4371da177e4SLinus Torvalds nfsi->npages++; 438c03b4024STrond Myklebust kref_get(&req->wb_kref); 439e7d39069STrond Myklebust spin_unlock(&inode->i_lock); 4401da177e4SLinus Torvalds } 4411da177e4SLinus Torvalds 4421da177e4SLinus Torvalds /* 44389a09141SPeter Zijlstra * Remove a write request from an inode 4441da177e4SLinus Torvalds */ 4451da177e4SLinus Torvalds static void nfs_inode_remove_request(struct nfs_page *req) 4461da177e4SLinus Torvalds { 4473d4ff43dSAl Viro struct inode *inode = req->wb_context->dentry->d_inode; 4481da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 4491da177e4SLinus Torvalds 450587142f8STrond Myklebust spin_lock(&inode->i_lock); 45129418aa4SMel Gorman if (likely(!PageSwapCache(req->wb_page))) { 452277459d2STrond Myklebust set_page_private(req->wb_page, 0); 453deb7d638STrond Myklebust ClearPagePrivate(req->wb_page); 4542df485a7STrond Myklebust clear_bit(PG_MAPPED, &req->wb_flags); 45529418aa4SMel Gorman } 4561da177e4SLinus Torvalds nfsi->npages--; 457587142f8STrond Myklebust spin_unlock(&inode->i_lock); 4581da177e4SLinus Torvalds nfs_release_request(req); 4591da177e4SLinus Torvalds } 4601da177e4SLinus Torvalds 46161822ab5STrond Myklebust static void 4626d884e8fSFred nfs_mark_request_dirty(struct nfs_page *req) 46361822ab5STrond Myklebust { 46461822ab5STrond Myklebust __set_page_dirty_nobuffers(req->wb_page); 46561822ab5STrond Myklebust } 46661822ab5STrond Myklebust 46789d77c8fSBryan Schumaker #if IS_ENABLED(CONFIG_NFS_V3) || IS_ENABLED(CONFIG_NFS_V4) 4688dd37758STrond Myklebust /** 4698dd37758STrond Myklebust * nfs_request_add_commit_list - add request to a commit list 4708dd37758STrond Myklebust * @req: pointer to a struct nfs_page 471ea2cf228SFred Isaman * @dst: commit list head 472ea2cf228SFred Isaman * @cinfo: holds list lock and accounting info 4738dd37758STrond Myklebust * 474ea2cf228SFred Isaman * This sets the PG_CLEAN bit, updates the cinfo count of 4758dd37758STrond Myklebust * number of outstanding requests requiring a commit as well as 4768dd37758STrond Myklebust * the MM page stats. 4778dd37758STrond Myklebust * 478ea2cf228SFred Isaman * The caller must _not_ hold the cinfo->lock, but must be 4798dd37758STrond Myklebust * holding the nfs_page lock. 4808dd37758STrond Myklebust */ 4818dd37758STrond Myklebust void 482ea2cf228SFred Isaman nfs_request_add_commit_list(struct nfs_page *req, struct list_head *dst, 483ea2cf228SFred Isaman struct nfs_commit_info *cinfo) 4848dd37758STrond Myklebust { 4858dd37758STrond Myklebust set_bit(PG_CLEAN, &(req)->wb_flags); 486ea2cf228SFred Isaman spin_lock(cinfo->lock); 487ea2cf228SFred Isaman nfs_list_add_request(req, dst); 488ea2cf228SFred Isaman cinfo->mds->ncommit++; 489ea2cf228SFred Isaman spin_unlock(cinfo->lock); 49056f9cd68SFred Isaman if (!cinfo->dreq) { 4918dd37758STrond Myklebust inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); 492d56b4ddfSMel Gorman inc_bdi_stat(page_file_mapping(req->wb_page)->backing_dev_info, 49356f9cd68SFred Isaman BDI_RECLAIMABLE); 49456f9cd68SFred Isaman __mark_inode_dirty(req->wb_context->dentry->d_inode, 49556f9cd68SFred Isaman I_DIRTY_DATASYNC); 49656f9cd68SFred Isaman } 4978dd37758STrond Myklebust } 4988dd37758STrond Myklebust EXPORT_SYMBOL_GPL(nfs_request_add_commit_list); 4998dd37758STrond Myklebust 5008dd37758STrond Myklebust /** 5018dd37758STrond Myklebust * nfs_request_remove_commit_list - Remove request from a commit list 5028dd37758STrond Myklebust * @req: pointer to a nfs_page 503ea2cf228SFred Isaman * @cinfo: holds list lock and accounting info 5048dd37758STrond Myklebust * 505ea2cf228SFred Isaman * This clears the PG_CLEAN bit, and updates the cinfo's count of 5068dd37758STrond Myklebust * number of outstanding requests requiring a commit 5078dd37758STrond Myklebust * It does not update the MM page stats. 5088dd37758STrond Myklebust * 509ea2cf228SFred Isaman * The caller _must_ hold the cinfo->lock and the nfs_page lock. 5108dd37758STrond Myklebust */ 5118dd37758STrond Myklebust void 512ea2cf228SFred Isaman nfs_request_remove_commit_list(struct nfs_page *req, 513ea2cf228SFred Isaman struct nfs_commit_info *cinfo) 5148dd37758STrond Myklebust { 5158dd37758STrond Myklebust if (!test_and_clear_bit(PG_CLEAN, &(req)->wb_flags)) 5168dd37758STrond Myklebust return; 5178dd37758STrond Myklebust nfs_list_remove_request(req); 518ea2cf228SFred Isaman cinfo->mds->ncommit--; 5198dd37758STrond Myklebust } 5208dd37758STrond Myklebust EXPORT_SYMBOL_GPL(nfs_request_remove_commit_list); 5218dd37758STrond Myklebust 522ea2cf228SFred Isaman static void nfs_init_cinfo_from_inode(struct nfs_commit_info *cinfo, 523ea2cf228SFred Isaman struct inode *inode) 524ea2cf228SFred Isaman { 525ea2cf228SFred Isaman cinfo->lock = &inode->i_lock; 526ea2cf228SFred Isaman cinfo->mds = &NFS_I(inode)->commit_info; 527ea2cf228SFred Isaman cinfo->ds = pnfs_get_ds_info(inode); 528b359f9d0SFred Isaman cinfo->dreq = NULL; 529f453a54aSFred Isaman cinfo->completion_ops = &nfs_commit_completion_ops; 530ea2cf228SFred Isaman } 531ea2cf228SFred Isaman 532ea2cf228SFred Isaman void nfs_init_cinfo(struct nfs_commit_info *cinfo, 533ea2cf228SFred Isaman struct inode *inode, 534ea2cf228SFred Isaman struct nfs_direct_req *dreq) 535ea2cf228SFred Isaman { 5361763da12SFred Isaman if (dreq) 5371763da12SFred Isaman nfs_init_cinfo_from_dreq(cinfo, dreq); 5381763da12SFred Isaman else 539ea2cf228SFred Isaman nfs_init_cinfo_from_inode(cinfo, inode); 540ea2cf228SFred Isaman } 541ea2cf228SFred Isaman EXPORT_SYMBOL_GPL(nfs_init_cinfo); 5428dd37758STrond Myklebust 5431da177e4SLinus Torvalds /* 5441da177e4SLinus Torvalds * Add a request to the inode's commit list. 5451da177e4SLinus Torvalds */ 5461763da12SFred Isaman void 547ea2cf228SFred Isaman nfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg, 548ea2cf228SFred Isaman struct nfs_commit_info *cinfo) 5491da177e4SLinus Torvalds { 550ea2cf228SFred Isaman if (pnfs_mark_request_commit(req, lseg, cinfo)) 5518dd37758STrond Myklebust return; 552ea2cf228SFred Isaman nfs_request_add_commit_list(req, &cinfo->mds->list, cinfo); 5531da177e4SLinus Torvalds } 5548e821cadSTrond Myklebust 555d6d6dc7cSFred Isaman static void 556d6d6dc7cSFred Isaman nfs_clear_page_commit(struct page *page) 557e468bae9STrond Myklebust { 558e468bae9STrond Myklebust dec_zone_page_state(page, NR_UNSTABLE_NFS); 559d56b4ddfSMel Gorman dec_bdi_stat(page_file_mapping(page)->backing_dev_info, BDI_RECLAIMABLE); 560e468bae9STrond Myklebust } 561d6d6dc7cSFred Isaman 5628dd37758STrond Myklebust static void 563d6d6dc7cSFred Isaman nfs_clear_request_commit(struct nfs_page *req) 564d6d6dc7cSFred Isaman { 5658dd37758STrond Myklebust if (test_bit(PG_CLEAN, &req->wb_flags)) { 5668dd37758STrond Myklebust struct inode *inode = req->wb_context->dentry->d_inode; 567ea2cf228SFred Isaman struct nfs_commit_info cinfo; 568d6d6dc7cSFred Isaman 569ea2cf228SFred Isaman nfs_init_cinfo_from_inode(&cinfo, inode); 570ea2cf228SFred Isaman if (!pnfs_clear_request_commit(req, &cinfo)) { 571ea2cf228SFred Isaman spin_lock(cinfo.lock); 572ea2cf228SFred Isaman nfs_request_remove_commit_list(req, &cinfo); 573ea2cf228SFred Isaman spin_unlock(cinfo.lock); 574d6d6dc7cSFred Isaman } 5758dd37758STrond Myklebust nfs_clear_page_commit(req->wb_page); 5768dd37758STrond Myklebust } 577e468bae9STrond Myklebust } 578e468bae9STrond Myklebust 5798e821cadSTrond Myklebust static inline 5808e821cadSTrond Myklebust int nfs_write_need_commit(struct nfs_write_data *data) 5818e821cadSTrond Myklebust { 582465d5243SFred Isaman if (data->verf.committed == NFS_DATA_SYNC) 583cd841605SFred Isaman return data->header->lseg == NULL; 5848e821cadSTrond Myklebust return data->verf.committed != NFS_FILE_SYNC; 5858e821cadSTrond Myklebust } 5868e821cadSTrond Myklebust 5878e821cadSTrond Myklebust #else 58868cd6fa4SBryan Schumaker static void nfs_init_cinfo_from_inode(struct nfs_commit_info *cinfo, 58968cd6fa4SBryan Schumaker struct inode *inode) 59068cd6fa4SBryan Schumaker { 59168cd6fa4SBryan Schumaker } 59268cd6fa4SBryan Schumaker 59368cd6fa4SBryan Schumaker void nfs_init_cinfo(struct nfs_commit_info *cinfo, 59468cd6fa4SBryan Schumaker struct inode *inode, 59568cd6fa4SBryan Schumaker struct nfs_direct_req *dreq) 59668cd6fa4SBryan Schumaker { 59768cd6fa4SBryan Schumaker } 59868cd6fa4SBryan Schumaker 5991763da12SFred Isaman void 600ea2cf228SFred Isaman nfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg, 601ea2cf228SFred Isaman struct nfs_commit_info *cinfo) 6028e821cadSTrond Myklebust { 6038e821cadSTrond Myklebust } 6048e821cadSTrond Myklebust 6058dd37758STrond Myklebust static void 606e468bae9STrond Myklebust nfs_clear_request_commit(struct nfs_page *req) 607e468bae9STrond Myklebust { 608e468bae9STrond Myklebust } 609e468bae9STrond Myklebust 6108e821cadSTrond Myklebust static inline 6118e821cadSTrond Myklebust int nfs_write_need_commit(struct nfs_write_data *data) 6128e821cadSTrond Myklebust { 6138e821cadSTrond Myklebust return 0; 6148e821cadSTrond Myklebust } 6158e821cadSTrond Myklebust 6161da177e4SLinus Torvalds #endif 6171da177e4SLinus Torvalds 618061ae2edSFred Isaman static void nfs_write_completion(struct nfs_pgio_header *hdr) 6196c75dc0dSFred Isaman { 620ea2cf228SFred Isaman struct nfs_commit_info cinfo; 6216c75dc0dSFred Isaman unsigned long bytes = 0; 6226c75dc0dSFred Isaman 6236c75dc0dSFred Isaman if (test_bit(NFS_IOHDR_REDO, &hdr->flags)) 6246c75dc0dSFred Isaman goto out; 625ea2cf228SFred Isaman nfs_init_cinfo_from_inode(&cinfo, hdr->inode); 6266c75dc0dSFred Isaman while (!list_empty(&hdr->pages)) { 6276c75dc0dSFred Isaman struct nfs_page *req = nfs_list_entry(hdr->pages.next); 6286c75dc0dSFred Isaman 6296c75dc0dSFred Isaman bytes += req->wb_bytes; 6306c75dc0dSFred Isaman nfs_list_remove_request(req); 6316c75dc0dSFred Isaman if (test_bit(NFS_IOHDR_ERROR, &hdr->flags) && 6326c75dc0dSFred Isaman (hdr->good_bytes < bytes)) { 633d1182b33STrond Myklebust nfs_set_pageerror(req->wb_page); 6346c75dc0dSFred Isaman nfs_context_set_write_error(req->wb_context, hdr->error); 6356c75dc0dSFred Isaman goto remove_req; 6366c75dc0dSFred Isaman } 6376c75dc0dSFred Isaman if (test_bit(NFS_IOHDR_NEED_RESCHED, &hdr->flags)) { 6386c75dc0dSFred Isaman nfs_mark_request_dirty(req); 6396c75dc0dSFred Isaman goto next; 6406c75dc0dSFred Isaman } 6416c75dc0dSFred Isaman if (test_bit(NFS_IOHDR_NEED_COMMIT, &hdr->flags)) { 6422f2c63bcSTrond Myklebust memcpy(&req->wb_verf, &hdr->verf->verifier, sizeof(req->wb_verf)); 643ea2cf228SFred Isaman nfs_mark_request_commit(req, hdr->lseg, &cinfo); 6446c75dc0dSFred Isaman goto next; 6456c75dc0dSFred Isaman } 6466c75dc0dSFred Isaman remove_req: 6476c75dc0dSFred Isaman nfs_inode_remove_request(req); 6486c75dc0dSFred Isaman next: 6491d1afcbcSTrond Myklebust nfs_unlock_request(req); 650d1182b33STrond Myklebust nfs_end_page_writeback(req->wb_page); 6513aff4ebbSTrond Myklebust nfs_release_request(req); 6526c75dc0dSFred Isaman } 6536c75dc0dSFred Isaman out: 6546c75dc0dSFred Isaman hdr->release(hdr); 6556c75dc0dSFred Isaman } 6566c75dc0dSFred Isaman 65789d77c8fSBryan Schumaker #if IS_ENABLED(CONFIG_NFS_V3) || IS_ENABLED(CONFIG_NFS_V4) 658ea2cf228SFred Isaman static unsigned long 659ea2cf228SFred Isaman nfs_reqs_to_commit(struct nfs_commit_info *cinfo) 660fb8a1f11STrond Myklebust { 661ea2cf228SFred Isaman return cinfo->mds->ncommit; 662fb8a1f11STrond Myklebust } 663fb8a1f11STrond Myklebust 664ea2cf228SFred Isaman /* cinfo->lock held by caller */ 6651763da12SFred Isaman int 666ea2cf228SFred Isaman nfs_scan_commit_list(struct list_head *src, struct list_head *dst, 667ea2cf228SFred Isaman struct nfs_commit_info *cinfo, int max) 668d6d6dc7cSFred Isaman { 669d6d6dc7cSFred Isaman struct nfs_page *req, *tmp; 670d6d6dc7cSFred Isaman int ret = 0; 671d6d6dc7cSFred Isaman 672d6d6dc7cSFred Isaman list_for_each_entry_safe(req, tmp, src, wb_list) { 6738dd37758STrond Myklebust if (!nfs_lock_request(req)) 6748dd37758STrond Myklebust continue; 6757ad84aa9STrond Myklebust kref_get(&req->wb_kref); 676ea2cf228SFred Isaman if (cond_resched_lock(cinfo->lock)) 6773b3be88dSTrond Myklebust list_safe_reset_next(req, tmp, wb_list); 678ea2cf228SFred Isaman nfs_request_remove_commit_list(req, cinfo); 6798dd37758STrond Myklebust nfs_list_add_request(req, dst); 680d6d6dc7cSFred Isaman ret++; 6811763da12SFred Isaman if ((ret == max) && !cinfo->dreq) 682d6d6dc7cSFred Isaman break; 683d6d6dc7cSFred Isaman } 684d6d6dc7cSFred Isaman return ret; 685d6d6dc7cSFred Isaman } 686d6d6dc7cSFred Isaman 6871da177e4SLinus Torvalds /* 6881da177e4SLinus Torvalds * nfs_scan_commit - Scan an inode for commit requests 6891da177e4SLinus Torvalds * @inode: NFS inode to scan 690ea2cf228SFred Isaman * @dst: mds destination list 691ea2cf228SFred Isaman * @cinfo: mds and ds lists of reqs ready to commit 6921da177e4SLinus Torvalds * 6931da177e4SLinus Torvalds * Moves requests from the inode's 'commit' request list. 6941da177e4SLinus Torvalds * The requests are *not* checked to ensure that they form a contiguous set. 6951da177e4SLinus Torvalds */ 6961763da12SFred Isaman int 697ea2cf228SFred Isaman nfs_scan_commit(struct inode *inode, struct list_head *dst, 698ea2cf228SFred Isaman struct nfs_commit_info *cinfo) 6991da177e4SLinus Torvalds { 700d6d6dc7cSFred Isaman int ret = 0; 701fb8a1f11STrond Myklebust 702ea2cf228SFred Isaman spin_lock(cinfo->lock); 703ea2cf228SFred Isaman if (cinfo->mds->ncommit > 0) { 7048dd37758STrond Myklebust const int max = INT_MAX; 705d6d6dc7cSFred Isaman 706ea2cf228SFred Isaman ret = nfs_scan_commit_list(&cinfo->mds->list, dst, 707ea2cf228SFred Isaman cinfo, max); 708ea2cf228SFred Isaman ret += pnfs_scan_commit_lists(inode, cinfo, max - ret); 709d6d6dc7cSFred Isaman } 710ea2cf228SFred Isaman spin_unlock(cinfo->lock); 711ff778d02STrond Myklebust return ret; 7121da177e4SLinus Torvalds } 713d6d6dc7cSFred Isaman 714c42de9ddSTrond Myklebust #else 715ea2cf228SFred Isaman static unsigned long nfs_reqs_to_commit(struct nfs_commit_info *cinfo) 716fb8a1f11STrond Myklebust { 717fb8a1f11STrond Myklebust return 0; 718fb8a1f11STrond Myklebust } 719fb8a1f11STrond Myklebust 7201763da12SFred Isaman int nfs_scan_commit(struct inode *inode, struct list_head *dst, 721ea2cf228SFred Isaman struct nfs_commit_info *cinfo) 722c42de9ddSTrond Myklebust { 723c42de9ddSTrond Myklebust return 0; 724c42de9ddSTrond Myklebust } 7251da177e4SLinus Torvalds #endif 7261da177e4SLinus Torvalds 7271da177e4SLinus Torvalds /* 728e7d39069STrond Myklebust * Search for an existing write request, and attempt to update 729e7d39069STrond Myklebust * it to reflect a new dirty region on a given page. 7301da177e4SLinus Torvalds * 731e7d39069STrond Myklebust * If the attempt fails, then the existing request is flushed out 732e7d39069STrond Myklebust * to disk. 7331da177e4SLinus Torvalds */ 734e7d39069STrond Myklebust static struct nfs_page *nfs_try_to_update_request(struct inode *inode, 735e7d39069STrond Myklebust struct page *page, 736e7d39069STrond Myklebust unsigned int offset, 737e7d39069STrond Myklebust unsigned int bytes) 7381da177e4SLinus Torvalds { 739e7d39069STrond Myklebust struct nfs_page *req; 740e7d39069STrond Myklebust unsigned int rqend; 741e7d39069STrond Myklebust unsigned int end; 7421da177e4SLinus Torvalds int error; 743277459d2STrond Myklebust 744e7d39069STrond Myklebust if (!PagePrivate(page)) 745e7d39069STrond Myklebust return NULL; 746e7d39069STrond Myklebust 747e7d39069STrond Myklebust end = offset + bytes; 748e7d39069STrond Myklebust spin_lock(&inode->i_lock); 749e7d39069STrond Myklebust 750e7d39069STrond Myklebust for (;;) { 75129418aa4SMel Gorman req = nfs_page_find_request_locked(NFS_I(inode), page); 752e7d39069STrond Myklebust if (req == NULL) 753e7d39069STrond Myklebust goto out_unlock; 754e7d39069STrond Myklebust 755e7d39069STrond Myklebust rqend = req->wb_offset + req->wb_bytes; 756e7d39069STrond Myklebust /* 757e7d39069STrond Myklebust * Tell the caller to flush out the request if 758e7d39069STrond Myklebust * the offsets are non-contiguous. 759e7d39069STrond Myklebust * Note: nfs_flush_incompatible() will already 760e7d39069STrond Myklebust * have flushed out requests having wrong owners. 761e7d39069STrond Myklebust */ 762e468bae9STrond Myklebust if (offset > rqend 763e7d39069STrond Myklebust || end < req->wb_offset) 764e7d39069STrond Myklebust goto out_flushme; 765e7d39069STrond Myklebust 7667ad84aa9STrond Myklebust if (nfs_lock_request(req)) 767e7d39069STrond Myklebust break; 768e7d39069STrond Myklebust 769e7d39069STrond Myklebust /* The request is locked, so wait and then retry */ 770587142f8STrond Myklebust spin_unlock(&inode->i_lock); 7711da177e4SLinus Torvalds error = nfs_wait_on_request(req); 7721da177e4SLinus Torvalds nfs_release_request(req); 773e7d39069STrond Myklebust if (error != 0) 774e7d39069STrond Myklebust goto out_err; 775e7d39069STrond Myklebust spin_lock(&inode->i_lock); 7761da177e4SLinus Torvalds } 7771da177e4SLinus Torvalds 7781da177e4SLinus Torvalds /* Okay, the request matches. Update the region */ 7791da177e4SLinus Torvalds if (offset < req->wb_offset) { 7801da177e4SLinus Torvalds req->wb_offset = offset; 7811da177e4SLinus Torvalds req->wb_pgbase = offset; 7821da177e4SLinus Torvalds } 7831da177e4SLinus Torvalds if (end > rqend) 7841da177e4SLinus Torvalds req->wb_bytes = end - req->wb_offset; 785e7d39069STrond Myklebust else 786e7d39069STrond Myklebust req->wb_bytes = rqend - req->wb_offset; 787e7d39069STrond Myklebust out_unlock: 788e7d39069STrond Myklebust spin_unlock(&inode->i_lock); 789ca138f36SFred Isaman if (req) 7908dd37758STrond Myklebust nfs_clear_request_commit(req); 791e7d39069STrond Myklebust return req; 792e7d39069STrond Myklebust out_flushme: 793e7d39069STrond Myklebust spin_unlock(&inode->i_lock); 794e7d39069STrond Myklebust nfs_release_request(req); 795e7d39069STrond Myklebust error = nfs_wb_page(inode, page); 796e7d39069STrond Myklebust out_err: 797e7d39069STrond Myklebust return ERR_PTR(error); 798e7d39069STrond Myklebust } 7991da177e4SLinus Torvalds 800e7d39069STrond Myklebust /* 801e7d39069STrond Myklebust * Try to update an existing write request, or create one if there is none. 802e7d39069STrond Myklebust * 803e7d39069STrond Myklebust * Note: Should always be called with the Page Lock held to prevent races 804e7d39069STrond Myklebust * if we have to add a new request. Also assumes that the caller has 805e7d39069STrond Myklebust * already called nfs_flush_incompatible() if necessary. 806e7d39069STrond Myklebust */ 807e7d39069STrond Myklebust static struct nfs_page * nfs_setup_write_request(struct nfs_open_context* ctx, 808e7d39069STrond Myklebust struct page *page, unsigned int offset, unsigned int bytes) 809e7d39069STrond Myklebust { 810d56b4ddfSMel Gorman struct inode *inode = page_file_mapping(page)->host; 811e7d39069STrond Myklebust struct nfs_page *req; 812e7d39069STrond Myklebust 813e7d39069STrond Myklebust req = nfs_try_to_update_request(inode, page, offset, bytes); 814e7d39069STrond Myklebust if (req != NULL) 815e7d39069STrond Myklebust goto out; 816e7d39069STrond Myklebust req = nfs_create_request(ctx, inode, page, offset, bytes); 817e7d39069STrond Myklebust if (IS_ERR(req)) 818e7d39069STrond Myklebust goto out; 819d6d6dc7cSFred Isaman nfs_inode_add_request(inode, req); 820efc91ed0STrond Myklebust out: 82161e930a9STrond Myklebust return req; 8221da177e4SLinus Torvalds } 8231da177e4SLinus Torvalds 824e7d39069STrond Myklebust static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page, 825e7d39069STrond Myklebust unsigned int offset, unsigned int count) 826e7d39069STrond Myklebust { 827e7d39069STrond Myklebust struct nfs_page *req; 828e7d39069STrond Myklebust 829e7d39069STrond Myklebust req = nfs_setup_write_request(ctx, page, offset, count); 830e7d39069STrond Myklebust if (IS_ERR(req)) 831e7d39069STrond Myklebust return PTR_ERR(req); 832e7d39069STrond Myklebust /* Update file length */ 833e7d39069STrond Myklebust nfs_grow_file(page, offset, count); 834e7d39069STrond Myklebust nfs_mark_uptodate(page, req->wb_pgbase, req->wb_bytes); 835a6305ddbSTrond Myklebust nfs_mark_request_dirty(req); 8361d1afcbcSTrond Myklebust nfs_unlock_and_release_request(req); 837e7d39069STrond Myklebust return 0; 838e7d39069STrond Myklebust } 839e7d39069STrond Myklebust 8401da177e4SLinus Torvalds int nfs_flush_incompatible(struct file *file, struct page *page) 8411da177e4SLinus Torvalds { 842cd3758e3STrond Myklebust struct nfs_open_context *ctx = nfs_file_open_context(file); 8432a369153STrond Myklebust struct nfs_lock_context *l_ctx; 8441da177e4SLinus Torvalds struct nfs_page *req; 8451a54533eSTrond Myklebust int do_flush, status; 8461da177e4SLinus Torvalds /* 8471da177e4SLinus Torvalds * Look for a request corresponding to this page. If there 8481da177e4SLinus Torvalds * is one, and it belongs to another file, we flush it out 8491da177e4SLinus Torvalds * before we try to copy anything into the page. Do this 8501da177e4SLinus Torvalds * due to the lack of an ACCESS-type call in NFSv2. 8511da177e4SLinus Torvalds * Also do the same if we find a request from an existing 8521da177e4SLinus Torvalds * dropped page. 8531da177e4SLinus Torvalds */ 8541a54533eSTrond Myklebust do { 855277459d2STrond Myklebust req = nfs_page_find_request(page); 8561a54533eSTrond Myklebust if (req == NULL) 8571a54533eSTrond Myklebust return 0; 8582a369153STrond Myklebust l_ctx = req->wb_lock_context; 8592a369153STrond Myklebust do_flush = req->wb_page != page || req->wb_context != ctx; 8602a369153STrond Myklebust if (l_ctx) { 8612a369153STrond Myklebust do_flush |= l_ctx->lockowner.l_owner != current->files 8622a369153STrond Myklebust || l_ctx->lockowner.l_pid != current->tgid; 8632a369153STrond Myklebust } 8641da177e4SLinus Torvalds nfs_release_request(req); 8651a54533eSTrond Myklebust if (!do_flush) 8661a54533eSTrond Myklebust return 0; 867d56b4ddfSMel Gorman status = nfs_wb_page(page_file_mapping(page)->host, page); 8681a54533eSTrond Myklebust } while (status == 0); 8691a54533eSTrond Myklebust return status; 8701da177e4SLinus Torvalds } 8711da177e4SLinus Torvalds 8721da177e4SLinus Torvalds /* 8735d47a356STrond Myklebust * If the page cache is marked as unsafe or invalid, then we can't rely on 8745d47a356STrond Myklebust * the PageUptodate() flag. In this case, we will need to turn off 8755d47a356STrond Myklebust * write optimisations that depend on the page contents being correct. 8765d47a356STrond Myklebust */ 8778d197a56STrond Myklebust static bool nfs_write_pageuptodate(struct page *page, struct inode *inode) 8785d47a356STrond Myklebust { 8798d197a56STrond Myklebust if (nfs_have_delegated_attributes(inode)) 8808d197a56STrond Myklebust goto out; 88181d9bce5SJeff Layton if (NFS_I(inode)->cache_validity & (NFS_INO_INVALID_DATA|NFS_INO_REVAL_PAGECACHE)) 8828d197a56STrond Myklebust return false; 8838d197a56STrond Myklebust out: 8848d197a56STrond Myklebust return PageUptodate(page) != 0; 8855d47a356STrond Myklebust } 8865d47a356STrond Myklebust 8875d47a356STrond Myklebust /* 8881da177e4SLinus Torvalds * Update and possibly write a cached page of an NFS file. 8891da177e4SLinus Torvalds * 8901da177e4SLinus Torvalds * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad 8911da177e4SLinus Torvalds * things with a page scheduled for an RPC call (e.g. invalidate it). 8921da177e4SLinus Torvalds */ 8931da177e4SLinus Torvalds int nfs_updatepage(struct file *file, struct page *page, 8941da177e4SLinus Torvalds unsigned int offset, unsigned int count) 8951da177e4SLinus Torvalds { 896cd3758e3STrond Myklebust struct nfs_open_context *ctx = nfs_file_open_context(file); 897d56b4ddfSMel Gorman struct inode *inode = page_file_mapping(page)->host; 8981da177e4SLinus Torvalds int status = 0; 8991da177e4SLinus Torvalds 90091d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE); 90191d5b470SChuck Lever 90248186c7dSChuck Lever dprintk("NFS: nfs_updatepage(%s/%s %d@%lld)\n", 90301cce933SJosef "Jeff" Sipek file->f_path.dentry->d_parent->d_name.name, 90401cce933SJosef "Jeff" Sipek file->f_path.dentry->d_name.name, count, 905d56b4ddfSMel Gorman (long long)(page_file_offset(page) + offset)); 9061da177e4SLinus Torvalds 9071da177e4SLinus Torvalds /* If we're not using byte range locks, and we know the page 9085d47a356STrond Myklebust * is up to date, it may be more efficient to extend the write 9095d47a356STrond Myklebust * to cover the entire page in order to avoid fragmentation 9105d47a356STrond Myklebust * inefficiencies. 9111da177e4SLinus Torvalds */ 9125d47a356STrond Myklebust if (nfs_write_pageuptodate(page, inode) && 9135d47a356STrond Myklebust inode->i_flock == NULL && 9146b2f3d1fSChristoph Hellwig !(file->f_flags & O_DSYNC)) { 91549a70f27STrond Myklebust count = max(count + offset, nfs_page_length(page)); 9161da177e4SLinus Torvalds offset = 0; 9171da177e4SLinus Torvalds } 9181da177e4SLinus Torvalds 919e21195a7STrond Myklebust status = nfs_writepage_setup(ctx, page, offset, count); 92003fa9e84STrond Myklebust if (status < 0) 92103fa9e84STrond Myklebust nfs_set_pageerror(page); 92259b7c05fSTrond Myklebust else 92359b7c05fSTrond Myklebust __set_page_dirty_nobuffers(page); 9241da177e4SLinus Torvalds 92548186c7dSChuck Lever dprintk("NFS: nfs_updatepage returns %d (isize %lld)\n", 9261da177e4SLinus Torvalds status, (long long)i_size_read(inode)); 9271da177e4SLinus Torvalds return status; 9281da177e4SLinus Torvalds } 9291da177e4SLinus Torvalds 9303ff7576dSTrond Myklebust static int flush_task_priority(int how) 9311da177e4SLinus Torvalds { 9321da177e4SLinus Torvalds switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) { 9331da177e4SLinus Torvalds case FLUSH_HIGHPRI: 9341da177e4SLinus Torvalds return RPC_PRIORITY_HIGH; 9351da177e4SLinus Torvalds case FLUSH_LOWPRI: 9361da177e4SLinus Torvalds return RPC_PRIORITY_LOW; 9371da177e4SLinus Torvalds } 9381da177e4SLinus Torvalds return RPC_PRIORITY_NORMAL; 9391da177e4SLinus Torvalds } 9401da177e4SLinus Torvalds 941c5996c4eSFred Isaman int nfs_initiate_write(struct rpc_clnt *clnt, 942c5996c4eSFred Isaman struct nfs_write_data *data, 943788e7a89STrond Myklebust const struct rpc_call_ops *call_ops, 9449f0ec176SAndy Adamson int how, int flags) 9451da177e4SLinus Torvalds { 946cd841605SFred Isaman struct inode *inode = data->header->inode; 9473ff7576dSTrond Myklebust int priority = flush_task_priority(how); 94807737691STrond Myklebust struct rpc_task *task; 949bdc7f021STrond Myklebust struct rpc_message msg = { 950bdc7f021STrond Myklebust .rpc_argp = &data->args, 951bdc7f021STrond Myklebust .rpc_resp = &data->res, 952cd841605SFred Isaman .rpc_cred = data->header->cred, 953bdc7f021STrond Myklebust }; 95484115e1cSTrond Myklebust struct rpc_task_setup task_setup_data = { 955d138d5d1SAndy Adamson .rpc_client = clnt, 95607737691STrond Myklebust .task = &data->task, 957bdc7f021STrond Myklebust .rpc_message = &msg, 95884115e1cSTrond Myklebust .callback_ops = call_ops, 95984115e1cSTrond Myklebust .callback_data = data, 960101070caSTrond Myklebust .workqueue = nfsiod_workqueue, 9619f0ec176SAndy Adamson .flags = RPC_TASK_ASYNC | flags, 9623ff7576dSTrond Myklebust .priority = priority, 96384115e1cSTrond Myklebust }; 9642c61be0aSTrond Myklebust int ret = 0; 9651da177e4SLinus Torvalds 966d138d5d1SAndy Adamson /* Set up the initial task struct. */ 967d138d5d1SAndy Adamson NFS_PROTO(inode)->write_setup(data, &msg); 968d138d5d1SAndy Adamson 969d138d5d1SAndy Adamson dprintk("NFS: %5u initiated write call " 970d138d5d1SAndy Adamson "(req %s/%lld, %u bytes @ offset %llu)\n", 971d138d5d1SAndy Adamson data->task.tk_pid, 972d138d5d1SAndy Adamson inode->i_sb->s_id, 973d138d5d1SAndy Adamson (long long)NFS_FILEID(inode), 974d138d5d1SAndy Adamson data->args.count, 975d138d5d1SAndy Adamson (unsigned long long)data->args.offset); 976d138d5d1SAndy Adamson 977d138d5d1SAndy Adamson task = rpc_run_task(&task_setup_data); 978d138d5d1SAndy Adamson if (IS_ERR(task)) { 979d138d5d1SAndy Adamson ret = PTR_ERR(task); 980d138d5d1SAndy Adamson goto out; 981d138d5d1SAndy Adamson } 982d138d5d1SAndy Adamson if (how & FLUSH_SYNC) { 983d138d5d1SAndy Adamson ret = rpc_wait_for_completion_task(task); 984d138d5d1SAndy Adamson if (ret == 0) 985d138d5d1SAndy Adamson ret = task->tk_status; 986d138d5d1SAndy Adamson } 987d138d5d1SAndy Adamson rpc_put_task(task); 988d138d5d1SAndy Adamson out: 989d138d5d1SAndy Adamson return ret; 990d138d5d1SAndy Adamson } 991a69aef14SFred Isaman EXPORT_SYMBOL_GPL(nfs_initiate_write); 992d138d5d1SAndy Adamson 993d138d5d1SAndy Adamson /* 994d138d5d1SAndy Adamson * Set up the argument/result storage required for the RPC call. 995d138d5d1SAndy Adamson */ 9966c75dc0dSFred Isaman static void nfs_write_rpcsetup(struct nfs_write_data *data, 997d138d5d1SAndy Adamson unsigned int count, unsigned int offset, 998ea2cf228SFred Isaman int how, struct nfs_commit_info *cinfo) 999d138d5d1SAndy Adamson { 10006c75dc0dSFred Isaman struct nfs_page *req = data->header->req; 1001d138d5d1SAndy Adamson 10021da177e4SLinus Torvalds /* Set up the RPC argument and reply structs 10031da177e4SLinus Torvalds * NB: take care not to mess about with data->commit et al. */ 10041da177e4SLinus Torvalds 10056c75dc0dSFred Isaman data->args.fh = NFS_FH(data->header->inode); 10061da177e4SLinus Torvalds data->args.offset = req_offset(req) + offset; 10072bea038cSBoaz Harrosh /* pnfs_set_layoutcommit needs this */ 10082bea038cSBoaz Harrosh data->mds_offset = data->args.offset; 10091da177e4SLinus Torvalds data->args.pgbase = req->wb_pgbase + offset; 101030dd374fSFred Isaman data->args.pages = data->pages.pagevec; 10111da177e4SLinus Torvalds data->args.count = count; 1012383ba719STrond Myklebust data->args.context = get_nfs_open_context(req->wb_context); 1013f11ac8dbSTrond Myklebust data->args.lock_context = req->wb_lock_context; 1014bdc7f021STrond Myklebust data->args.stable = NFS_UNSTABLE; 101587ed5eb4STrond Myklebust switch (how & (FLUSH_STABLE | FLUSH_COND_STABLE)) { 101687ed5eb4STrond Myklebust case 0: 101787ed5eb4STrond Myklebust break; 101887ed5eb4STrond Myklebust case FLUSH_COND_STABLE: 1019ea2cf228SFred Isaman if (nfs_reqs_to_commit(cinfo)) 102087ed5eb4STrond Myklebust break; 102187ed5eb4STrond Myklebust default: 1022bdc7f021STrond Myklebust data->args.stable = NFS_FILE_SYNC; 1023bdc7f021STrond Myklebust } 10241da177e4SLinus Torvalds 10251da177e4SLinus Torvalds data->res.fattr = &data->fattr; 10261da177e4SLinus Torvalds data->res.count = count; 10271da177e4SLinus Torvalds data->res.verf = &data->verf; 10280e574af1STrond Myklebust nfs_fattr_init(&data->fattr); 10296e4efd56STrond Myklebust } 10301da177e4SLinus Torvalds 10316e4efd56STrond Myklebust static int nfs_do_write(struct nfs_write_data *data, 10326e4efd56STrond Myklebust const struct rpc_call_ops *call_ops, 10336e4efd56STrond Myklebust int how) 10346e4efd56STrond Myklebust { 1035cd841605SFred Isaman struct inode *inode = data->header->inode; 10360382b744SAndy Adamson 10379f0ec176SAndy Adamson return nfs_initiate_write(NFS_CLIENT(inode), data, call_ops, how, 0); 10381da177e4SLinus Torvalds } 10391da177e4SLinus Torvalds 1040275acaafSTrond Myklebust static int nfs_do_multiple_writes(struct list_head *head, 1041275acaafSTrond Myklebust const struct rpc_call_ops *call_ops, 1042275acaafSTrond Myklebust int how) 1043275acaafSTrond Myklebust { 1044275acaafSTrond Myklebust struct nfs_write_data *data; 1045275acaafSTrond Myklebust int ret = 0; 1046275acaafSTrond Myklebust 1047275acaafSTrond Myklebust while (!list_empty(head)) { 1048275acaafSTrond Myklebust int ret2; 1049275acaafSTrond Myklebust 10506c75dc0dSFred Isaman data = list_first_entry(head, struct nfs_write_data, list); 1051275acaafSTrond Myklebust list_del_init(&data->list); 1052275acaafSTrond Myklebust 1053dce81290STrond Myklebust ret2 = nfs_do_write(data, call_ops, how); 1054275acaafSTrond Myklebust if (ret == 0) 1055275acaafSTrond Myklebust ret = ret2; 1056275acaafSTrond Myklebust } 1057275acaafSTrond Myklebust return ret; 1058275acaafSTrond Myklebust } 1059275acaafSTrond Myklebust 10606d884e8fSFred /* If a nfs_flush_* function fails, it should remove reqs from @head and 10616d884e8fSFred * call this on each, which will prepare them to be retried on next 10626d884e8fSFred * writeback using standard nfs. 10636d884e8fSFred */ 10646d884e8fSFred static void nfs_redirty_request(struct nfs_page *req) 10656d884e8fSFred { 10666d884e8fSFred nfs_mark_request_dirty(req); 10671d1afcbcSTrond Myklebust nfs_unlock_request(req); 1068d1182b33STrond Myklebust nfs_end_page_writeback(req->wb_page); 10693aff4ebbSTrond Myklebust nfs_release_request(req); 10706d884e8fSFred } 10716d884e8fSFred 1072061ae2edSFred Isaman static void nfs_async_write_error(struct list_head *head) 10736c75dc0dSFred Isaman { 10746c75dc0dSFred Isaman struct nfs_page *req; 10756c75dc0dSFred Isaman 10766c75dc0dSFred Isaman while (!list_empty(head)) { 10776c75dc0dSFred Isaman req = nfs_list_entry(head->next); 10786c75dc0dSFred Isaman nfs_list_remove_request(req); 10796c75dc0dSFred Isaman nfs_redirty_request(req); 10806c75dc0dSFred Isaman } 10816c75dc0dSFred Isaman } 10826c75dc0dSFred Isaman 1083061ae2edSFred Isaman static const struct nfs_pgio_completion_ops nfs_async_write_completion_ops = { 1084061ae2edSFred Isaman .error_cleanup = nfs_async_write_error, 1085061ae2edSFred Isaman .completion = nfs_write_completion, 1086061ae2edSFred Isaman }; 1087061ae2edSFred Isaman 108825b11dcdSTrond Myklebust static void nfs_flush_error(struct nfs_pageio_descriptor *desc, 108925b11dcdSTrond Myklebust struct nfs_pgio_header *hdr) 109025b11dcdSTrond Myklebust { 109125b11dcdSTrond Myklebust set_bit(NFS_IOHDR_REDO, &hdr->flags); 109225b11dcdSTrond Myklebust while (!list_empty(&hdr->rpc_list)) { 109325b11dcdSTrond Myklebust struct nfs_write_data *data = list_first_entry(&hdr->rpc_list, 109425b11dcdSTrond Myklebust struct nfs_write_data, list); 109525b11dcdSTrond Myklebust list_del(&data->list); 109625b11dcdSTrond Myklebust nfs_writedata_release(data); 109725b11dcdSTrond Myklebust } 109825b11dcdSTrond Myklebust desc->pg_completion_ops->error_cleanup(&desc->pg_list); 109925b11dcdSTrond Myklebust } 110025b11dcdSTrond Myklebust 11011da177e4SLinus Torvalds /* 11021da177e4SLinus Torvalds * Generate multiple small requests to write out a single 11031da177e4SLinus Torvalds * contiguous dirty area on one page. 11041da177e4SLinus Torvalds */ 11056c75dc0dSFred Isaman static int nfs_flush_multi(struct nfs_pageio_descriptor *desc, 11066c75dc0dSFred Isaman struct nfs_pgio_header *hdr) 11071da177e4SLinus Torvalds { 11086c75dc0dSFred Isaman struct nfs_page *req = hdr->req; 11091da177e4SLinus Torvalds struct page *page = req->wb_page; 11101da177e4SLinus Torvalds struct nfs_write_data *data; 1111d097971dSTrond Myklebust size_t wsize = desc->pg_bsize, nbytes; 1112e9f7bee1STrond Myklebust unsigned int offset; 11131da177e4SLinus Torvalds int requests = 0; 1114ea2cf228SFred Isaman struct nfs_commit_info cinfo; 11151da177e4SLinus Torvalds 1116ea2cf228SFred Isaman nfs_init_cinfo(&cinfo, desc->pg_inode, desc->pg_dreq); 11171da177e4SLinus Torvalds 1118b31268acSTrond Myklebust if ((desc->pg_ioflags & FLUSH_COND_STABLE) && 1119ea2cf228SFred Isaman (desc->pg_moreio || nfs_reqs_to_commit(&cinfo) || 1120b31268acSTrond Myklebust desc->pg_count > wsize)) 1121b31268acSTrond Myklebust desc->pg_ioflags &= ~FLUSH_COND_STABLE; 1122b31268acSTrond Myklebust 1123b31268acSTrond Myklebust 1124275acaafSTrond Myklebust offset = 0; 1125c76069bdSFred Isaman nbytes = desc->pg_count; 1126e9f7bee1STrond Myklebust do { 1127e9f7bee1STrond Myklebust size_t len = min(nbytes, wsize); 1128e9f7bee1STrond Myklebust 11296c75dc0dSFred Isaman data = nfs_writedata_alloc(hdr, 1); 113025b11dcdSTrond Myklebust if (!data) { 113125b11dcdSTrond Myklebust nfs_flush_error(desc, hdr); 113225b11dcdSTrond Myklebust return -ENOMEM; 113325b11dcdSTrond Myklebust } 113430dd374fSFred Isaman data->pages.pagevec[0] = page; 1135ea2cf228SFred Isaman nfs_write_rpcsetup(data, len, offset, desc->pg_ioflags, &cinfo); 11366c75dc0dSFred Isaman list_add(&data->list, &hdr->rpc_list); 11371da177e4SLinus Torvalds requests++; 1138e9f7bee1STrond Myklebust nbytes -= len; 1139275acaafSTrond Myklebust offset += len; 1140e9f7bee1STrond Myklebust } while (nbytes != 0); 114125b11dcdSTrond Myklebust nfs_list_remove_request(req); 114225b11dcdSTrond Myklebust nfs_list_add_request(req, &hdr->pages); 11436c75dc0dSFred Isaman desc->pg_rpc_callops = &nfs_write_common_ops; 114425b11dcdSTrond Myklebust return 0; 11451da177e4SLinus Torvalds } 11461da177e4SLinus Torvalds 11471da177e4SLinus Torvalds /* 11481da177e4SLinus Torvalds * Create an RPC task for the given write request and kick it. 11491da177e4SLinus Torvalds * The page must have been locked by the caller. 11501da177e4SLinus Torvalds * 11511da177e4SLinus Torvalds * It may happen that the page we're passed is not marked dirty. 11521da177e4SLinus Torvalds * This is the case if nfs_updatepage detects a conflicting request 11531da177e4SLinus Torvalds * that has been written but not committed. 11541da177e4SLinus Torvalds */ 11556c75dc0dSFred Isaman static int nfs_flush_one(struct nfs_pageio_descriptor *desc, 11566c75dc0dSFred Isaman struct nfs_pgio_header *hdr) 11571da177e4SLinus Torvalds { 11581da177e4SLinus Torvalds struct nfs_page *req; 11591da177e4SLinus Torvalds struct page **pages; 11601da177e4SLinus Torvalds struct nfs_write_data *data; 1161c76069bdSFred Isaman struct list_head *head = &desc->pg_list; 1162ea2cf228SFred Isaman struct nfs_commit_info cinfo; 11631da177e4SLinus Torvalds 11646c75dc0dSFred Isaman data = nfs_writedata_alloc(hdr, nfs_page_array_len(desc->pg_base, 1165c76069bdSFred Isaman desc->pg_count)); 11666c75dc0dSFred Isaman if (!data) { 116725b11dcdSTrond Myklebust nfs_flush_error(desc, hdr); 116825b11dcdSTrond Myklebust return -ENOMEM; 116944b83799SFred Isaman } 11706c75dc0dSFred Isaman 1171ea2cf228SFred Isaman nfs_init_cinfo(&cinfo, desc->pg_inode, desc->pg_dreq); 117230dd374fSFred Isaman pages = data->pages.pagevec; 11731da177e4SLinus Torvalds while (!list_empty(head)) { 11741da177e4SLinus Torvalds req = nfs_list_entry(head->next); 11751da177e4SLinus Torvalds nfs_list_remove_request(req); 11766c75dc0dSFred Isaman nfs_list_add_request(req, &hdr->pages); 11771da177e4SLinus Torvalds *pages++ = req->wb_page; 11781da177e4SLinus Torvalds } 11791da177e4SLinus Torvalds 1180b31268acSTrond Myklebust if ((desc->pg_ioflags & FLUSH_COND_STABLE) && 1181ea2cf228SFred Isaman (desc->pg_moreio || nfs_reqs_to_commit(&cinfo))) 1182b31268acSTrond Myklebust desc->pg_ioflags &= ~FLUSH_COND_STABLE; 1183b31268acSTrond Myklebust 11841da177e4SLinus Torvalds /* Set up the argument struct */ 1185ea2cf228SFred Isaman nfs_write_rpcsetup(data, desc->pg_count, 0, desc->pg_ioflags, &cinfo); 11866c75dc0dSFred Isaman list_add(&data->list, &hdr->rpc_list); 11876c75dc0dSFred Isaman desc->pg_rpc_callops = &nfs_write_common_ops; 118825b11dcdSTrond Myklebust return 0; 11891da177e4SLinus Torvalds } 11901da177e4SLinus Torvalds 11916c75dc0dSFred Isaman int nfs_generic_flush(struct nfs_pageio_descriptor *desc, 11926c75dc0dSFred Isaman struct nfs_pgio_header *hdr) 1193dce81290STrond Myklebust { 1194dce81290STrond Myklebust if (desc->pg_bsize < PAGE_CACHE_SIZE) 11956c75dc0dSFred Isaman return nfs_flush_multi(desc, hdr); 11966c75dc0dSFred Isaman return nfs_flush_one(desc, hdr); 1197dce81290STrond Myklebust } 119889d77c8fSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_generic_flush); 1199dce81290STrond Myklebust 1200dce81290STrond Myklebust static int nfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc) 12011751c363STrond Myklebust { 12026c75dc0dSFred Isaman struct nfs_write_header *whdr; 12036c75dc0dSFred Isaman struct nfs_pgio_header *hdr; 1204275acaafSTrond Myklebust int ret; 1205275acaafSTrond Myklebust 12066c75dc0dSFred Isaman whdr = nfs_writehdr_alloc(); 12076c75dc0dSFred Isaman if (!whdr) { 12089b5415b5STrond Myklebust desc->pg_completion_ops->error_cleanup(&desc->pg_list); 12096c75dc0dSFred Isaman return -ENOMEM; 12106c75dc0dSFred Isaman } 12116c75dc0dSFred Isaman hdr = &whdr->header; 12126c75dc0dSFred Isaman nfs_pgheader_init(desc, hdr, nfs_writehdr_free); 12136c75dc0dSFred Isaman atomic_inc(&hdr->refcnt); 12146c75dc0dSFred Isaman ret = nfs_generic_flush(desc, hdr); 1215275acaafSTrond Myklebust if (ret == 0) 12166c75dc0dSFred Isaman ret = nfs_do_multiple_writes(&hdr->rpc_list, 12176c75dc0dSFred Isaman desc->pg_rpc_callops, 1218dce81290STrond Myklebust desc->pg_ioflags); 12196c75dc0dSFred Isaman if (atomic_dec_and_test(&hdr->refcnt)) 1220061ae2edSFred Isaman hdr->completion_ops->completion(hdr); 1221275acaafSTrond Myklebust return ret; 12221751c363STrond Myklebust } 12231751c363STrond Myklebust 12241751c363STrond Myklebust static const struct nfs_pageio_ops nfs_pageio_write_ops = { 12251751c363STrond Myklebust .pg_test = nfs_generic_pg_test, 12261751c363STrond Myklebust .pg_doio = nfs_generic_pg_writepages, 12271751c363STrond Myklebust }; 12281751c363STrond Myklebust 122957208fa7SBryan Schumaker void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, 1230061ae2edSFred Isaman struct inode *inode, int ioflags, 1231061ae2edSFred Isaman const struct nfs_pgio_completion_ops *compl_ops) 12321751c363STrond Myklebust { 1233061ae2edSFred Isaman nfs_pageio_init(pgio, inode, &nfs_pageio_write_ops, compl_ops, 12341751c363STrond Myklebust NFS_SERVER(inode)->wsize, ioflags); 12351751c363STrond Myklebust } 1236ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_pageio_init_write); 12371751c363STrond Myklebust 1238dce81290STrond Myklebust void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio) 1239dce81290STrond Myklebust { 1240dce81290STrond Myklebust pgio->pg_ops = &nfs_pageio_write_ops; 1241dce81290STrond Myklebust pgio->pg_bsize = NFS_SERVER(pgio->pg_inode)->wsize; 1242dce81290STrond Myklebust } 12431f945357STrond Myklebust EXPORT_SYMBOL_GPL(nfs_pageio_reset_write_mds); 1244dce81290STrond Myklebust 12451da177e4SLinus Torvalds 1246def6ed7eSAndy Adamson void nfs_write_prepare(struct rpc_task *task, void *calldata) 1247def6ed7eSAndy Adamson { 1248def6ed7eSAndy Adamson struct nfs_write_data *data = calldata; 1249cd841605SFred Isaman NFS_PROTO(data->header->inode)->write_rpc_prepare(task, data); 1250def6ed7eSAndy Adamson } 1251def6ed7eSAndy Adamson 12520b7c0153SFred Isaman void nfs_commit_prepare(struct rpc_task *task, void *calldata) 12530b7c0153SFred Isaman { 12540b7c0153SFred Isaman struct nfs_commit_data *data = calldata; 12550b7c0153SFred Isaman 12560b7c0153SFred Isaman NFS_PROTO(data->inode)->commit_rpc_prepare(task, data); 12570b7c0153SFred Isaman } 12580b7c0153SFred Isaman 12591da177e4SLinus Torvalds /* 12601da177e4SLinus Torvalds * Handle a write reply that flushes a whole page. 12611da177e4SLinus Torvalds * 12621da177e4SLinus Torvalds * FIXME: There is an inherent race with invalidate_inode_pages and 12631da177e4SLinus Torvalds * writebacks since the page->count is kept > 1 for as long 12641da177e4SLinus Torvalds * as the page has a write request pending. 12651da177e4SLinus Torvalds */ 12666c75dc0dSFred Isaman static void nfs_writeback_done_common(struct rpc_task *task, void *calldata) 12671da177e4SLinus Torvalds { 1268788e7a89STrond Myklebust struct nfs_write_data *data = calldata; 12691da177e4SLinus Torvalds 1270c9d8f89dSTrond Myklebust nfs_writeback_done(task, data); 1271c9d8f89dSTrond Myklebust } 1272c9d8f89dSTrond Myklebust 12736c75dc0dSFred Isaman static void nfs_writeback_release_common(void *calldata) 1274c9d8f89dSTrond Myklebust { 1275c9d8f89dSTrond Myklebust struct nfs_write_data *data = calldata; 1276cd841605SFred Isaman struct nfs_pgio_header *hdr = data->header; 1277e2fecb21STrond Myklebust int status = data->task.tk_status; 1278788e7a89STrond Myklebust 12796c75dc0dSFred Isaman if ((status >= 0) && nfs_write_need_commit(data)) { 12806c75dc0dSFred Isaman spin_lock(&hdr->lock); 12816c75dc0dSFred Isaman if (test_bit(NFS_IOHDR_NEED_RESCHED, &hdr->flags)) 12826c75dc0dSFred Isaman ; /* Do nothing */ 12836c75dc0dSFred Isaman else if (!test_and_set_bit(NFS_IOHDR_NEED_COMMIT, &hdr->flags)) 12849bce008bSTrond Myklebust memcpy(hdr->verf, &data->verf, sizeof(*hdr->verf)); 12859bce008bSTrond Myklebust else if (memcmp(hdr->verf, &data->verf, sizeof(*hdr->verf))) 12866c75dc0dSFred Isaman set_bit(NFS_IOHDR_NEED_RESCHED, &hdr->flags); 12876c75dc0dSFred Isaman spin_unlock(&hdr->lock); 12881da177e4SLinus Torvalds } 1289cd841605SFred Isaman nfs_writedata_release(data); 12901da177e4SLinus Torvalds } 12911da177e4SLinus Torvalds 12926c75dc0dSFred Isaman static const struct rpc_call_ops nfs_write_common_ops = { 1293def6ed7eSAndy Adamson .rpc_call_prepare = nfs_write_prepare, 12946c75dc0dSFred Isaman .rpc_call_done = nfs_writeback_done_common, 12956c75dc0dSFred Isaman .rpc_release = nfs_writeback_release_common, 1296788e7a89STrond Myklebust }; 1297788e7a89STrond Myklebust 1298788e7a89STrond Myklebust 12991da177e4SLinus Torvalds /* 13001da177e4SLinus Torvalds * This function is called when the WRITE call is complete. 13011da177e4SLinus Torvalds */ 130213602896SFred Isaman void nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data) 13031da177e4SLinus Torvalds { 13041da177e4SLinus Torvalds struct nfs_writeargs *argp = &data->args; 13051da177e4SLinus Torvalds struct nfs_writeres *resp = &data->res; 1306cd841605SFred Isaman struct inode *inode = data->header->inode; 1307788e7a89STrond Myklebust int status; 13081da177e4SLinus Torvalds 1309a3f565b1SChuck Lever dprintk("NFS: %5u nfs_writeback_done (status %d)\n", 13101da177e4SLinus Torvalds task->tk_pid, task->tk_status); 13111da177e4SLinus Torvalds 1312f551e44fSChuck Lever /* 1313f551e44fSChuck Lever * ->write_done will attempt to use post-op attributes to detect 1314f551e44fSChuck Lever * conflicting writes by other clients. A strict interpretation 1315f551e44fSChuck Lever * of close-to-open would allow us to continue caching even if 1316f551e44fSChuck Lever * another writer had changed the file, but some applications 1317f551e44fSChuck Lever * depend on tighter cache coherency when writing. 1318f551e44fSChuck Lever */ 1319cd841605SFred Isaman status = NFS_PROTO(inode)->write_done(task, data); 1320788e7a89STrond Myklebust if (status != 0) 132113602896SFred Isaman return; 1322cd841605SFred Isaman nfs_add_stats(inode, NFSIOS_SERVERWRITTENBYTES, resp->count); 132391d5b470SChuck Lever 132489d77c8fSBryan Schumaker #if IS_ENABLED(CONFIG_NFS_V3) || IS_ENABLED(CONFIG_NFS_V4) 13251da177e4SLinus Torvalds if (resp->verf->committed < argp->stable && task->tk_status >= 0) { 13261da177e4SLinus Torvalds /* We tried a write call, but the server did not 13271da177e4SLinus Torvalds * commit data to stable storage even though we 13281da177e4SLinus Torvalds * requested it. 13291da177e4SLinus Torvalds * Note: There is a known bug in Tru64 < 5.0 in which 13301da177e4SLinus Torvalds * the server reports NFS_DATA_SYNC, but performs 13311da177e4SLinus Torvalds * NFS_FILE_SYNC. We therefore implement this checking 13321da177e4SLinus Torvalds * as a dprintk() in order to avoid filling syslog. 13331da177e4SLinus Torvalds */ 13341da177e4SLinus Torvalds static unsigned long complain; 13351da177e4SLinus Torvalds 1336a69aef14SFred Isaman /* Note this will print the MDS for a DS write */ 13371da177e4SLinus Torvalds if (time_before(complain, jiffies)) { 13381da177e4SLinus Torvalds dprintk("NFS: faulty NFS server %s:" 13391da177e4SLinus Torvalds " (committed = %d) != (stable = %d)\n", 1340cd841605SFred Isaman NFS_SERVER(inode)->nfs_client->cl_hostname, 13411da177e4SLinus Torvalds resp->verf->committed, argp->stable); 13421da177e4SLinus Torvalds complain = jiffies + 300 * HZ; 13431da177e4SLinus Torvalds } 13441da177e4SLinus Torvalds } 13451da177e4SLinus Torvalds #endif 13466c75dc0dSFred Isaman if (task->tk_status < 0) 13476c75dc0dSFred Isaman nfs_set_pgio_error(data->header, task->tk_status, argp->offset); 13486c75dc0dSFred Isaman else if (resp->count < argp->count) { 13491da177e4SLinus Torvalds static unsigned long complain; 13501da177e4SLinus Torvalds 13516c75dc0dSFred Isaman /* This a short write! */ 1352cd841605SFred Isaman nfs_inc_stats(inode, NFSIOS_SHORTWRITE); 135391d5b470SChuck Lever 13541da177e4SLinus Torvalds /* Has the server at least made some progress? */ 13556c75dc0dSFred Isaman if (resp->count == 0) { 13566c75dc0dSFred Isaman if (time_before(complain, jiffies)) { 13576c75dc0dSFred Isaman printk(KERN_WARNING 13586c75dc0dSFred Isaman "NFS: Server wrote zero bytes, expected %u.\n", 13596c75dc0dSFred Isaman argp->count); 13606c75dc0dSFred Isaman complain = jiffies + 300 * HZ; 13616c75dc0dSFred Isaman } 13626c75dc0dSFred Isaman nfs_set_pgio_error(data->header, -EIO, argp->offset); 13636c75dc0dSFred Isaman task->tk_status = -EIO; 13646c75dc0dSFred Isaman return; 13656c75dc0dSFred Isaman } 13661da177e4SLinus Torvalds /* Was this an NFSv2 write or an NFSv3 stable write? */ 13671da177e4SLinus Torvalds if (resp->verf->committed != NFS_UNSTABLE) { 13681da177e4SLinus Torvalds /* Resend from where the server left off */ 1369a69aef14SFred Isaman data->mds_offset += resp->count; 13701da177e4SLinus Torvalds argp->offset += resp->count; 13711da177e4SLinus Torvalds argp->pgbase += resp->count; 13721da177e4SLinus Torvalds argp->count -= resp->count; 13731da177e4SLinus Torvalds } else { 13741da177e4SLinus Torvalds /* Resend as a stable write in order to avoid 13751da177e4SLinus Torvalds * headaches in the case of a server crash. 13761da177e4SLinus Torvalds */ 13771da177e4SLinus Torvalds argp->stable = NFS_FILE_SYNC; 13781da177e4SLinus Torvalds } 1379d00c5d43STrond Myklebust rpc_restart_call_prepare(task); 13801da177e4SLinus Torvalds } 13811da177e4SLinus Torvalds } 13821da177e4SLinus Torvalds 13831da177e4SLinus Torvalds 138489d77c8fSBryan Schumaker #if IS_ENABLED(CONFIG_NFS_V3) || IS_ENABLED(CONFIG_NFS_V4) 138571d0a611STrond Myklebust static int nfs_commit_set_lock(struct nfs_inode *nfsi, int may_wait) 138671d0a611STrond Myklebust { 1387b8413f98STrond Myklebust int ret; 1388b8413f98STrond Myklebust 138971d0a611STrond Myklebust if (!test_and_set_bit(NFS_INO_COMMIT, &nfsi->flags)) 139071d0a611STrond Myklebust return 1; 1391b8413f98STrond Myklebust if (!may_wait) 139271d0a611STrond Myklebust return 0; 1393b8413f98STrond Myklebust ret = out_of_line_wait_on_bit_lock(&nfsi->flags, 1394b8413f98STrond Myklebust NFS_INO_COMMIT, 1395b8413f98STrond Myklebust nfs_wait_bit_killable, 1396b8413f98STrond Myklebust TASK_KILLABLE); 1397b8413f98STrond Myklebust return (ret < 0) ? ret : 1; 139871d0a611STrond Myklebust } 139971d0a611STrond Myklebust 1400f453a54aSFred Isaman static void nfs_commit_clear_lock(struct nfs_inode *nfsi) 140171d0a611STrond Myklebust { 140271d0a611STrond Myklebust clear_bit(NFS_INO_COMMIT, &nfsi->flags); 140371d0a611STrond Myklebust smp_mb__after_clear_bit(); 140471d0a611STrond Myklebust wake_up_bit(&nfsi->flags, NFS_INO_COMMIT); 140571d0a611STrond Myklebust } 140671d0a611STrond Myklebust 14070b7c0153SFred Isaman void nfs_commitdata_release(struct nfs_commit_data *data) 14081da177e4SLinus Torvalds { 14090b7c0153SFred Isaman put_nfs_open_context(data->context); 14100b7c0153SFred Isaman nfs_commit_free(data); 14111da177e4SLinus Torvalds } 1412e0c2b380SFred Isaman EXPORT_SYMBOL_GPL(nfs_commitdata_release); 14131da177e4SLinus Torvalds 14140b7c0153SFred Isaman int nfs_initiate_commit(struct rpc_clnt *clnt, struct nfs_commit_data *data, 14159ace33cdSFred Isaman const struct rpc_call_ops *call_ops, 14169f0ec176SAndy Adamson int how, int flags) 14171da177e4SLinus Torvalds { 141807737691STrond Myklebust struct rpc_task *task; 14199ace33cdSFred Isaman int priority = flush_task_priority(how); 1420bdc7f021STrond Myklebust struct rpc_message msg = { 1421bdc7f021STrond Myklebust .rpc_argp = &data->args, 1422bdc7f021STrond Myklebust .rpc_resp = &data->res, 14239ace33cdSFred Isaman .rpc_cred = data->cred, 1424bdc7f021STrond Myklebust }; 142584115e1cSTrond Myklebust struct rpc_task_setup task_setup_data = { 142607737691STrond Myklebust .task = &data->task, 14279ace33cdSFred Isaman .rpc_client = clnt, 1428bdc7f021STrond Myklebust .rpc_message = &msg, 14299ace33cdSFred Isaman .callback_ops = call_ops, 143084115e1cSTrond Myklebust .callback_data = data, 1431101070caSTrond Myklebust .workqueue = nfsiod_workqueue, 14329f0ec176SAndy Adamson .flags = RPC_TASK_ASYNC | flags, 14333ff7576dSTrond Myklebust .priority = priority, 143484115e1cSTrond Myklebust }; 1435788e7a89STrond Myklebust /* Set up the initial task struct. */ 14369ace33cdSFred Isaman NFS_PROTO(data->inode)->commit_setup(data, &msg); 14371da177e4SLinus Torvalds 1438a3f565b1SChuck Lever dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid); 1439bdc7f021STrond Myklebust 144007737691STrond Myklebust task = rpc_run_task(&task_setup_data); 1441dbae4c73STrond Myklebust if (IS_ERR(task)) 1442dbae4c73STrond Myklebust return PTR_ERR(task); 1443d2224e7aSJeff Layton if (how & FLUSH_SYNC) 1444d2224e7aSJeff Layton rpc_wait_for_completion_task(task); 144507737691STrond Myklebust rpc_put_task(task); 1446dbae4c73STrond Myklebust return 0; 14471da177e4SLinus Torvalds } 1448e0c2b380SFred Isaman EXPORT_SYMBOL_GPL(nfs_initiate_commit); 14491da177e4SLinus Torvalds 14501da177e4SLinus Torvalds /* 14519ace33cdSFred Isaman * Set up the argument/result storage required for the RPC call. 14529ace33cdSFred Isaman */ 14530b7c0153SFred Isaman void nfs_init_commit(struct nfs_commit_data *data, 1454988b6dceSFred Isaman struct list_head *head, 1455f453a54aSFred Isaman struct pnfs_layout_segment *lseg, 1456f453a54aSFred Isaman struct nfs_commit_info *cinfo) 14579ace33cdSFred Isaman { 14589ace33cdSFred Isaman struct nfs_page *first = nfs_list_entry(head->next); 14593d4ff43dSAl Viro struct inode *inode = first->wb_context->dentry->d_inode; 14609ace33cdSFred Isaman 14619ace33cdSFred Isaman /* Set up the RPC argument and reply structs 14629ace33cdSFred Isaman * NB: take care not to mess about with data->commit et al. */ 14639ace33cdSFred Isaman 14649ace33cdSFred Isaman list_splice_init(head, &data->pages); 14659ace33cdSFred Isaman 14669ace33cdSFred Isaman data->inode = inode; 14679ace33cdSFred Isaman data->cred = first->wb_context->cred; 1468988b6dceSFred Isaman data->lseg = lseg; /* reference transferred */ 14699ace33cdSFred Isaman data->mds_ops = &nfs_commit_ops; 1470f453a54aSFred Isaman data->completion_ops = cinfo->completion_ops; 1471b359f9d0SFred Isaman data->dreq = cinfo->dreq; 14729ace33cdSFred Isaman 14739ace33cdSFred Isaman data->args.fh = NFS_FH(data->inode); 14749ace33cdSFred Isaman /* Note: we always request a commit of the entire inode */ 14759ace33cdSFred Isaman data->args.offset = 0; 14769ace33cdSFred Isaman data->args.count = 0; 14770b7c0153SFred Isaman data->context = get_nfs_open_context(first->wb_context); 14789ace33cdSFred Isaman data->res.fattr = &data->fattr; 14799ace33cdSFred Isaman data->res.verf = &data->verf; 14809ace33cdSFred Isaman nfs_fattr_init(&data->fattr); 14819ace33cdSFred Isaman } 1482e0c2b380SFred Isaman EXPORT_SYMBOL_GPL(nfs_init_commit); 14839ace33cdSFred Isaman 1484e0c2b380SFred Isaman void nfs_retry_commit(struct list_head *page_list, 1485ea2cf228SFred Isaman struct pnfs_layout_segment *lseg, 1486ea2cf228SFred Isaman struct nfs_commit_info *cinfo) 148764bfeb49SFred Isaman { 148864bfeb49SFred Isaman struct nfs_page *req; 148964bfeb49SFred Isaman 149064bfeb49SFred Isaman while (!list_empty(page_list)) { 149164bfeb49SFred Isaman req = nfs_list_entry(page_list->next); 149264bfeb49SFred Isaman nfs_list_remove_request(req); 1493ea2cf228SFred Isaman nfs_mark_request_commit(req, lseg, cinfo); 149456f9cd68SFred Isaman if (!cinfo->dreq) { 149564bfeb49SFred Isaman dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); 1496d56b4ddfSMel Gorman dec_bdi_stat(page_file_mapping(req->wb_page)->backing_dev_info, 149764bfeb49SFred Isaman BDI_RECLAIMABLE); 149856f9cd68SFred Isaman } 14991d1afcbcSTrond Myklebust nfs_unlock_and_release_request(req); 150064bfeb49SFred Isaman } 150164bfeb49SFred Isaman } 1502e0c2b380SFred Isaman EXPORT_SYMBOL_GPL(nfs_retry_commit); 150364bfeb49SFred Isaman 15049ace33cdSFred Isaman /* 15051da177e4SLinus Torvalds * Commit dirty pages 15061da177e4SLinus Torvalds */ 15071da177e4SLinus Torvalds static int 1508ea2cf228SFred Isaman nfs_commit_list(struct inode *inode, struct list_head *head, int how, 1509ea2cf228SFred Isaman struct nfs_commit_info *cinfo) 15101da177e4SLinus Torvalds { 15110b7c0153SFred Isaman struct nfs_commit_data *data; 15121da177e4SLinus Torvalds 1513c9d8f89dSTrond Myklebust data = nfs_commitdata_alloc(); 15141da177e4SLinus Torvalds 15151da177e4SLinus Torvalds if (!data) 15161da177e4SLinus Torvalds goto out_bad; 15171da177e4SLinus Torvalds 15181da177e4SLinus Torvalds /* Set up the argument struct */ 1519f453a54aSFred Isaman nfs_init_commit(data, head, NULL, cinfo); 1520f453a54aSFred Isaman atomic_inc(&cinfo->mds->rpcs_out); 15219f0ec176SAndy Adamson return nfs_initiate_commit(NFS_CLIENT(inode), data, data->mds_ops, 15229f0ec176SAndy Adamson how, 0); 15231da177e4SLinus Torvalds out_bad: 1524ea2cf228SFred Isaman nfs_retry_commit(head, NULL, cinfo); 1525f453a54aSFred Isaman cinfo->completion_ops->error_cleanup(NFS_I(inode)); 15261da177e4SLinus Torvalds return -ENOMEM; 15271da177e4SLinus Torvalds } 15281da177e4SLinus Torvalds 15291da177e4SLinus Torvalds /* 15301da177e4SLinus Torvalds * COMMIT call returned 15311da177e4SLinus Torvalds */ 1532788e7a89STrond Myklebust static void nfs_commit_done(struct rpc_task *task, void *calldata) 15331da177e4SLinus Torvalds { 15340b7c0153SFred Isaman struct nfs_commit_data *data = calldata; 15351da177e4SLinus Torvalds 1536a3f565b1SChuck Lever dprintk("NFS: %5u nfs_commit_done (status %d)\n", 15371da177e4SLinus Torvalds task->tk_pid, task->tk_status); 15381da177e4SLinus Torvalds 1539788e7a89STrond Myklebust /* Call the NFS version-specific code */ 1540c0d0e96bSTrond Myklebust NFS_PROTO(data->inode)->commit_done(task, data); 1541c9d8f89dSTrond Myklebust } 1542c9d8f89dSTrond Myklebust 1543f453a54aSFred Isaman static void nfs_commit_release_pages(struct nfs_commit_data *data) 1544c9d8f89dSTrond Myklebust { 1545c9d8f89dSTrond Myklebust struct nfs_page *req; 1546c9d8f89dSTrond Myklebust int status = data->task.tk_status; 1547f453a54aSFred Isaman struct nfs_commit_info cinfo; 1548788e7a89STrond Myklebust 15491da177e4SLinus Torvalds while (!list_empty(&data->pages)) { 15501da177e4SLinus Torvalds req = nfs_list_entry(data->pages.next); 15511da177e4SLinus Torvalds nfs_list_remove_request(req); 1552d6d6dc7cSFred Isaman nfs_clear_page_commit(req->wb_page); 15531da177e4SLinus Torvalds 155448186c7dSChuck Lever dprintk("NFS: commit (%s/%lld %d@%lld)", 15553d4ff43dSAl Viro req->wb_context->dentry->d_sb->s_id, 15563d4ff43dSAl Viro (long long)NFS_FILEID(req->wb_context->dentry->d_inode), 15571da177e4SLinus Torvalds req->wb_bytes, 15581da177e4SLinus Torvalds (long long)req_offset(req)); 1559c9d8f89dSTrond Myklebust if (status < 0) { 1560c9d8f89dSTrond Myklebust nfs_context_set_write_error(req->wb_context, status); 15611da177e4SLinus Torvalds nfs_inode_remove_request(req); 1562c9d8f89dSTrond Myklebust dprintk(", error = %d\n", status); 15631da177e4SLinus Torvalds goto next; 15641da177e4SLinus Torvalds } 15651da177e4SLinus Torvalds 15661da177e4SLinus Torvalds /* Okay, COMMIT succeeded, apparently. Check the verifier 15671da177e4SLinus Torvalds * returned by the server against all stored verfs. */ 15682f2c63bcSTrond Myklebust if (!memcmp(&req->wb_verf, &data->verf.verifier, sizeof(req->wb_verf))) { 15691da177e4SLinus Torvalds /* We have a match */ 15701da177e4SLinus Torvalds nfs_inode_remove_request(req); 15711da177e4SLinus Torvalds dprintk(" OK\n"); 15721da177e4SLinus Torvalds goto next; 15731da177e4SLinus Torvalds } 15741da177e4SLinus Torvalds /* We have a mismatch. Write the page again */ 15751da177e4SLinus Torvalds dprintk(" mismatch\n"); 15766d884e8fSFred nfs_mark_request_dirty(req); 157705990d1bSTrond Myklebust set_bit(NFS_CONTEXT_RESEND_WRITES, &req->wb_context->flags); 15781da177e4SLinus Torvalds next: 15791d1afcbcSTrond Myklebust nfs_unlock_and_release_request(req); 15801da177e4SLinus Torvalds } 1581f453a54aSFred Isaman nfs_init_cinfo(&cinfo, data->inode, data->dreq); 1582f453a54aSFred Isaman if (atomic_dec_and_test(&cinfo.mds->rpcs_out)) 1583f453a54aSFred Isaman nfs_commit_clear_lock(NFS_I(data->inode)); 15845917ce84SFred Isaman } 15855917ce84SFred Isaman 15865917ce84SFred Isaman static void nfs_commit_release(void *calldata) 15875917ce84SFred Isaman { 15880b7c0153SFred Isaman struct nfs_commit_data *data = calldata; 15895917ce84SFred Isaman 1590f453a54aSFred Isaman data->completion_ops->completion(data); 1591c9d8f89dSTrond Myklebust nfs_commitdata_release(calldata); 15921da177e4SLinus Torvalds } 1593788e7a89STrond Myklebust 1594788e7a89STrond Myklebust static const struct rpc_call_ops nfs_commit_ops = { 15950b7c0153SFred Isaman .rpc_call_prepare = nfs_commit_prepare, 1596788e7a89STrond Myklebust .rpc_call_done = nfs_commit_done, 1597788e7a89STrond Myklebust .rpc_release = nfs_commit_release, 1598788e7a89STrond Myklebust }; 15991da177e4SLinus Torvalds 1600f453a54aSFred Isaman static const struct nfs_commit_completion_ops nfs_commit_completion_ops = { 1601f453a54aSFred Isaman .completion = nfs_commit_release_pages, 1602f453a54aSFred Isaman .error_cleanup = nfs_commit_clear_lock, 1603f453a54aSFred Isaman }; 1604f453a54aSFred Isaman 16051763da12SFred Isaman int nfs_generic_commit_list(struct inode *inode, struct list_head *head, 1606ea2cf228SFred Isaman int how, struct nfs_commit_info *cinfo) 160784c53ab5SFred Isaman { 160884c53ab5SFred Isaman int status; 160984c53ab5SFred Isaman 1610ea2cf228SFred Isaman status = pnfs_commit_list(inode, head, how, cinfo); 161184c53ab5SFred Isaman if (status == PNFS_NOT_ATTEMPTED) 1612ea2cf228SFred Isaman status = nfs_commit_list(inode, head, how, cinfo); 161384c53ab5SFred Isaman return status; 161484c53ab5SFred Isaman } 161584c53ab5SFred Isaman 1616b608b283STrond Myklebust int nfs_commit_inode(struct inode *inode, int how) 16171da177e4SLinus Torvalds { 16181da177e4SLinus Torvalds LIST_HEAD(head); 1619ea2cf228SFred Isaman struct nfs_commit_info cinfo; 162071d0a611STrond Myklebust int may_wait = how & FLUSH_SYNC; 1621b8413f98STrond Myklebust int res; 16221da177e4SLinus Torvalds 1623b8413f98STrond Myklebust res = nfs_commit_set_lock(NFS_I(inode), may_wait); 1624b8413f98STrond Myklebust if (res <= 0) 1625c5efa5fcSTrond Myklebust goto out_mark_dirty; 1626ea2cf228SFred Isaman nfs_init_cinfo_from_inode(&cinfo, inode); 1627ea2cf228SFred Isaman res = nfs_scan_commit(inode, &head, &cinfo); 16281da177e4SLinus Torvalds if (res) { 1629a861a1e1SFred Isaman int error; 1630a861a1e1SFred Isaman 1631ea2cf228SFred Isaman error = nfs_generic_commit_list(inode, &head, how, &cinfo); 16321da177e4SLinus Torvalds if (error < 0) 16331da177e4SLinus Torvalds return error; 1634b8413f98STrond Myklebust if (!may_wait) 1635b8413f98STrond Myklebust goto out_mark_dirty; 1636b8413f98STrond Myklebust error = wait_on_bit(&NFS_I(inode)->flags, 1637b8413f98STrond Myklebust NFS_INO_COMMIT, 163871d0a611STrond Myklebust nfs_wait_bit_killable, 163971d0a611STrond Myklebust TASK_KILLABLE); 1640b8413f98STrond Myklebust if (error < 0) 1641b8413f98STrond Myklebust return error; 164271d0a611STrond Myklebust } else 164371d0a611STrond Myklebust nfs_commit_clear_lock(NFS_I(inode)); 1644c5efa5fcSTrond Myklebust return res; 1645c5efa5fcSTrond Myklebust /* Note: If we exit without ensuring that the commit is complete, 1646c5efa5fcSTrond Myklebust * we must mark the inode as dirty. Otherwise, future calls to 1647c5efa5fcSTrond Myklebust * sync_inode() with the WB_SYNC_ALL flag set will fail to ensure 1648c5efa5fcSTrond Myklebust * that the data is on the disk. 1649c5efa5fcSTrond Myklebust */ 1650c5efa5fcSTrond Myklebust out_mark_dirty: 1651c5efa5fcSTrond Myklebust __mark_inode_dirty(inode, I_DIRTY_DATASYNC); 16521da177e4SLinus Torvalds return res; 16531da177e4SLinus Torvalds } 16548fc795f7STrond Myklebust 16558fc795f7STrond Myklebust static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_control *wbc) 16568fc795f7STrond Myklebust { 1657420e3646STrond Myklebust struct nfs_inode *nfsi = NFS_I(inode); 1658420e3646STrond Myklebust int flags = FLUSH_SYNC; 1659420e3646STrond Myklebust int ret = 0; 16608fc795f7STrond Myklebust 16613236c3e1SJeff Layton /* no commits means nothing needs to be done */ 1662ea2cf228SFred Isaman if (!nfsi->commit_info.ncommit) 16633236c3e1SJeff Layton return ret; 16643236c3e1SJeff Layton 1665a00dd6c0SJeff Layton if (wbc->sync_mode == WB_SYNC_NONE) { 1666a00dd6c0SJeff Layton /* Don't commit yet if this is a non-blocking flush and there 1667a00dd6c0SJeff Layton * are a lot of outstanding writes for this mapping. 1668420e3646STrond Myklebust */ 1669ea2cf228SFred Isaman if (nfsi->commit_info.ncommit <= (nfsi->npages >> 1)) 1670420e3646STrond Myklebust goto out_mark_dirty; 1671420e3646STrond Myklebust 1672a00dd6c0SJeff Layton /* don't wait for the COMMIT response */ 1673420e3646STrond Myklebust flags = 0; 1674a00dd6c0SJeff Layton } 1675a00dd6c0SJeff Layton 1676420e3646STrond Myklebust ret = nfs_commit_inode(inode, flags); 1677420e3646STrond Myklebust if (ret >= 0) { 1678420e3646STrond Myklebust if (wbc->sync_mode == WB_SYNC_NONE) { 1679420e3646STrond Myklebust if (ret < wbc->nr_to_write) 1680420e3646STrond Myklebust wbc->nr_to_write -= ret; 1681420e3646STrond Myklebust else 1682420e3646STrond Myklebust wbc->nr_to_write = 0; 1683420e3646STrond Myklebust } 16848fc795f7STrond Myklebust return 0; 1685420e3646STrond Myklebust } 1686420e3646STrond Myklebust out_mark_dirty: 16878fc795f7STrond Myklebust __mark_inode_dirty(inode, I_DIRTY_DATASYNC); 16888fc795f7STrond Myklebust return ret; 16898fc795f7STrond Myklebust } 1690c63c7b05STrond Myklebust #else 16918fc795f7STrond Myklebust static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_control *wbc) 16928fc795f7STrond Myklebust { 16938fc795f7STrond Myklebust return 0; 16948fc795f7STrond Myklebust } 16951da177e4SLinus Torvalds #endif 16961da177e4SLinus Torvalds 16978fc795f7STrond Myklebust int nfs_write_inode(struct inode *inode, struct writeback_control *wbc) 16988fc795f7STrond Myklebust { 1699a8d8f02cSBryan Schumaker return nfs_commit_unstable_pages(inode, wbc); 1700a8d8f02cSBryan Schumaker } 170189d77c8fSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_write_inode); 1702863a3c6cSAndy Adamson 1703acdc53b2STrond Myklebust /* 1704acdc53b2STrond Myklebust * flush the inode to disk. 1705acdc53b2STrond Myklebust */ 1706acdc53b2STrond Myklebust int nfs_wb_all(struct inode *inode) 170734901f70STrond Myklebust { 170834901f70STrond Myklebust struct writeback_control wbc = { 170972cb77f4STrond Myklebust .sync_mode = WB_SYNC_ALL, 171034901f70STrond Myklebust .nr_to_write = LONG_MAX, 1711d7fb1207STrond Myklebust .range_start = 0, 1712d7fb1207STrond Myklebust .range_end = LLONG_MAX, 171334901f70STrond Myklebust }; 171434901f70STrond Myklebust 1715acdc53b2STrond Myklebust return sync_inode(inode, &wbc); 17161c75950bSTrond Myklebust } 1717ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_wb_all); 17181c75950bSTrond Myklebust 17191b3b4a1aSTrond Myklebust int nfs_wb_page_cancel(struct inode *inode, struct page *page) 17201b3b4a1aSTrond Myklebust { 17211b3b4a1aSTrond Myklebust struct nfs_page *req; 17221b3b4a1aSTrond Myklebust int ret = 0; 17231b3b4a1aSTrond Myklebust 17241b3b4a1aSTrond Myklebust for (;;) { 1725ba8b06e6STrond Myklebust wait_on_page_writeback(page); 17261b3b4a1aSTrond Myklebust req = nfs_page_find_request(page); 17271b3b4a1aSTrond Myklebust if (req == NULL) 17281b3b4a1aSTrond Myklebust break; 17297ad84aa9STrond Myklebust if (nfs_lock_request(req)) { 17308dd37758STrond Myklebust nfs_clear_request_commit(req); 17311b3b4a1aSTrond Myklebust nfs_inode_remove_request(req); 17321b3b4a1aSTrond Myklebust /* 17331b3b4a1aSTrond Myklebust * In case nfs_inode_remove_request has marked the 17341b3b4a1aSTrond Myklebust * page as being dirty 17351b3b4a1aSTrond Myklebust */ 17361b3b4a1aSTrond Myklebust cancel_dirty_page(page, PAGE_CACHE_SIZE); 17371d1afcbcSTrond Myklebust nfs_unlock_and_release_request(req); 17381b3b4a1aSTrond Myklebust break; 17391b3b4a1aSTrond Myklebust } 17401b3b4a1aSTrond Myklebust ret = nfs_wait_on_request(req); 1741c9edda71STrond Myklebust nfs_release_request(req); 17421b3b4a1aSTrond Myklebust if (ret < 0) 1743c988950eSTrond Myklebust break; 17441b3b4a1aSTrond Myklebust } 17451b3b4a1aSTrond Myklebust return ret; 17461b3b4a1aSTrond Myklebust } 17471b3b4a1aSTrond Myklebust 17481c75950bSTrond Myklebust /* 17491c75950bSTrond Myklebust * Write back all requests on one page - we do this before reading it. 17501c75950bSTrond Myklebust */ 17511c75950bSTrond Myklebust int nfs_wb_page(struct inode *inode, struct page *page) 17521c75950bSTrond Myklebust { 175329418aa4SMel Gorman loff_t range_start = page_file_offset(page); 17547f2f12d9STrond Myklebust loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); 17557f2f12d9STrond Myklebust struct writeback_control wbc = { 17567f2f12d9STrond Myklebust .sync_mode = WB_SYNC_ALL, 17577f2f12d9STrond Myklebust .nr_to_write = 0, 17587f2f12d9STrond Myklebust .range_start = range_start, 17597f2f12d9STrond Myklebust .range_end = range_end, 17607f2f12d9STrond Myklebust }; 17617f2f12d9STrond Myklebust int ret; 17627f2f12d9STrond Myklebust 17630522f6adSTrond Myklebust for (;;) { 1764ba8b06e6STrond Myklebust wait_on_page_writeback(page); 17657f2f12d9STrond Myklebust if (clear_page_dirty_for_io(page)) { 17667f2f12d9STrond Myklebust ret = nfs_writepage_locked(page, &wbc); 17677f2f12d9STrond Myklebust if (ret < 0) 17687f2f12d9STrond Myklebust goto out_error; 17690522f6adSTrond Myklebust continue; 17707f2f12d9STrond Myklebust } 17710522f6adSTrond Myklebust if (!PagePrivate(page)) 17720522f6adSTrond Myklebust break; 17730522f6adSTrond Myklebust ret = nfs_commit_inode(inode, FLUSH_SYNC); 17747f2f12d9STrond Myklebust if (ret < 0) 17757f2f12d9STrond Myklebust goto out_error; 17767f2f12d9STrond Myklebust } 17777f2f12d9STrond Myklebust return 0; 17787f2f12d9STrond Myklebust out_error: 17797f2f12d9STrond Myklebust return ret; 17801c75950bSTrond Myklebust } 17811c75950bSTrond Myklebust 1782074cc1deSTrond Myklebust #ifdef CONFIG_MIGRATION 1783074cc1deSTrond Myklebust int nfs_migrate_page(struct address_space *mapping, struct page *newpage, 1784a6bc32b8SMel Gorman struct page *page, enum migrate_mode mode) 1785074cc1deSTrond Myklebust { 17862da95652SJeff Layton /* 17872da95652SJeff Layton * If PagePrivate is set, then the page is currently associated with 17882da95652SJeff Layton * an in-progress read or write request. Don't try to migrate it. 17892da95652SJeff Layton * 17902da95652SJeff Layton * FIXME: we could do this in principle, but we'll need a way to ensure 17912da95652SJeff Layton * that we can safely release the inode reference while holding 17922da95652SJeff Layton * the page lock. 17932da95652SJeff Layton */ 17942da95652SJeff Layton if (PagePrivate(page)) 17952da95652SJeff Layton return -EBUSY; 1796074cc1deSTrond Myklebust 1797*8c209ce7SDavid Howells if (!nfs_fscache_release_page(page, GFP_KERNEL)) 1798*8c209ce7SDavid Howells return -EBUSY; 1799074cc1deSTrond Myklebust 1800a6bc32b8SMel Gorman return migrate_page(mapping, newpage, page, mode); 1801074cc1deSTrond Myklebust } 1802074cc1deSTrond Myklebust #endif 1803074cc1deSTrond Myklebust 1804f7b422b1SDavid Howells int __init nfs_init_writepagecache(void) 18051da177e4SLinus Torvalds { 18061da177e4SLinus Torvalds nfs_wdata_cachep = kmem_cache_create("nfs_write_data", 1807cd841605SFred Isaman sizeof(struct nfs_write_header), 18081da177e4SLinus Torvalds 0, SLAB_HWCACHE_ALIGN, 180920c2df83SPaul Mundt NULL); 18101da177e4SLinus Torvalds if (nfs_wdata_cachep == NULL) 18111da177e4SLinus Torvalds return -ENOMEM; 18121da177e4SLinus Torvalds 181393d2341cSMatthew Dobson nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE, 18141da177e4SLinus Torvalds nfs_wdata_cachep); 18151da177e4SLinus Torvalds if (nfs_wdata_mempool == NULL) 18163dd4765fSJeff Layton goto out_destroy_write_cache; 18171da177e4SLinus Torvalds 18180b7c0153SFred Isaman nfs_cdata_cachep = kmem_cache_create("nfs_commit_data", 18190b7c0153SFred Isaman sizeof(struct nfs_commit_data), 18200b7c0153SFred Isaman 0, SLAB_HWCACHE_ALIGN, 18210b7c0153SFred Isaman NULL); 18220b7c0153SFred Isaman if (nfs_cdata_cachep == NULL) 18233dd4765fSJeff Layton goto out_destroy_write_mempool; 18240b7c0153SFred Isaman 182593d2341cSMatthew Dobson nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT, 18264c100210SYanchuan Nian nfs_cdata_cachep); 18271da177e4SLinus Torvalds if (nfs_commit_mempool == NULL) 18283dd4765fSJeff Layton goto out_destroy_commit_cache; 18291da177e4SLinus Torvalds 183089a09141SPeter Zijlstra /* 183189a09141SPeter Zijlstra * NFS congestion size, scale with available memory. 183289a09141SPeter Zijlstra * 183389a09141SPeter Zijlstra * 64MB: 8192k 183489a09141SPeter Zijlstra * 128MB: 11585k 183589a09141SPeter Zijlstra * 256MB: 16384k 183689a09141SPeter Zijlstra * 512MB: 23170k 183789a09141SPeter Zijlstra * 1GB: 32768k 183889a09141SPeter Zijlstra * 2GB: 46340k 183989a09141SPeter Zijlstra * 4GB: 65536k 184089a09141SPeter Zijlstra * 8GB: 92681k 184189a09141SPeter Zijlstra * 16GB: 131072k 184289a09141SPeter Zijlstra * 184389a09141SPeter Zijlstra * This allows larger machines to have larger/more transfers. 184489a09141SPeter Zijlstra * Limit the default to 256M 184589a09141SPeter Zijlstra */ 184689a09141SPeter Zijlstra nfs_congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); 184789a09141SPeter Zijlstra if (nfs_congestion_kb > 256*1024) 184889a09141SPeter Zijlstra nfs_congestion_kb = 256*1024; 184989a09141SPeter Zijlstra 18501da177e4SLinus Torvalds return 0; 18513dd4765fSJeff Layton 18523dd4765fSJeff Layton out_destroy_commit_cache: 18533dd4765fSJeff Layton kmem_cache_destroy(nfs_cdata_cachep); 18543dd4765fSJeff Layton out_destroy_write_mempool: 18553dd4765fSJeff Layton mempool_destroy(nfs_wdata_mempool); 18563dd4765fSJeff Layton out_destroy_write_cache: 18573dd4765fSJeff Layton kmem_cache_destroy(nfs_wdata_cachep); 18583dd4765fSJeff Layton return -ENOMEM; 18591da177e4SLinus Torvalds } 18601da177e4SLinus Torvalds 1861266bee88SDavid Brownell void nfs_destroy_writepagecache(void) 18621da177e4SLinus Torvalds { 18631da177e4SLinus Torvalds mempool_destroy(nfs_commit_mempool); 18643dd4765fSJeff Layton kmem_cache_destroy(nfs_cdata_cachep); 18651da177e4SLinus Torvalds mempool_destroy(nfs_wdata_mempool); 18661a1d92c1SAlexey Dobriyan kmem_cache_destroy(nfs_wdata_cachep); 18671da177e4SLinus Torvalds } 18681da177e4SLinus Torvalds 1869