1457c8996SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 21da177e4SLinus Torvalds /* 31da177e4SLinus Torvalds * linux/fs/nfs/write.c 41da177e4SLinus Torvalds * 57c85d900STrond Myklebust * Write file data over NFS. 61da177e4SLinus Torvalds * 71da177e4SLinus Torvalds * Copyright (C) 1996, 1997, Olaf Kirch <okir@monad.swb.de> 81da177e4SLinus Torvalds */ 91da177e4SLinus Torvalds 101da177e4SLinus Torvalds #include <linux/types.h> 111da177e4SLinus Torvalds #include <linux/slab.h> 121da177e4SLinus Torvalds #include <linux/mm.h> 131da177e4SLinus Torvalds #include <linux/pagemap.h> 141da177e4SLinus Torvalds #include <linux/file.h> 151da177e4SLinus Torvalds #include <linux/writeback.h> 1689a09141SPeter Zijlstra #include <linux/swap.h> 17074cc1deSTrond Myklebust #include <linux/migrate.h> 181da177e4SLinus Torvalds 191da177e4SLinus Torvalds #include <linux/sunrpc/clnt.h> 201da177e4SLinus Torvalds #include <linux/nfs_fs.h> 211da177e4SLinus Torvalds #include <linux/nfs_mount.h> 221da177e4SLinus Torvalds #include <linux/nfs_page.h> 233fcfab16SAndrew Morton #include <linux/backing-dev.h> 24afeacc8cSPaul Gortmaker #include <linux/export.h> 25af7cf057STrond Myklebust #include <linux/freezer.h> 26af7cf057STrond Myklebust #include <linux/wait.h> 271eb5d98fSJeff Layton #include <linux/iversion.h> 285970e15dSJeff Layton #include <linux/filelock.h> 293fcfab16SAndrew Morton 307c0f6ba6SLinus Torvalds #include <linux/uaccess.h> 31875bc3fbSTrond Myklebust #include <linux/sched/mm.h> 321da177e4SLinus Torvalds 331da177e4SLinus Torvalds #include "delegation.h" 3449a70f27STrond Myklebust #include "internal.h" 3591d5b470SChuck Lever #include "iostat.h" 36def6ed7eSAndy Adamson #include "nfs4_fs.h" 37074cc1deSTrond Myklebust #include "fscache.h" 3894ad1c80SFred Isaman #include "pnfs.h" 391da177e4SLinus Torvalds 40f4ce1299STrond Myklebust #include "nfstrace.h" 41f4ce1299STrond Myklebust 421da177e4SLinus Torvalds #define NFSDBG_FACILITY NFSDBG_PAGECACHE 431da177e4SLinus Torvalds 441da177e4SLinus Torvalds #define MIN_POOL_WRITE (32) 451da177e4SLinus Torvalds #define MIN_POOL_COMMIT (4) 461da177e4SLinus Torvalds 47919e3bd9STrond Myklebust struct nfs_io_completion { 48919e3bd9STrond Myklebust void (*complete)(void *data); 49919e3bd9STrond Myklebust void *data; 50919e3bd9STrond Myklebust struct kref refcount; 51919e3bd9STrond Myklebust }; 52919e3bd9STrond Myklebust 531da177e4SLinus Torvalds /* 541da177e4SLinus Torvalds * Local function declarations 551da177e4SLinus Torvalds */ 56f8512ad0SFred Isaman static void nfs_redirty_request(struct nfs_page *req); 57788e7a89STrond Myklebust static const struct rpc_call_ops nfs_commit_ops; 58061ae2edSFred Isaman static const struct nfs_pgio_completion_ops nfs_async_write_completion_ops; 59f453a54aSFred Isaman static const struct nfs_commit_completion_ops nfs_commit_completion_ops; 604a0de55cSAnna Schumaker static const struct nfs_rw_ops nfs_rw_write_ops; 6106c9fdf3STrond Myklebust static void nfs_inode_remove_request(struct nfs_page *req); 62b193a78dSTrond Myklebust static void nfs_clear_request_commit(struct nfs_commit_info *cinfo, 63b193a78dSTrond Myklebust struct nfs_page *req); 6402d1426cSWeston Andros Adamson static void nfs_init_cinfo_from_inode(struct nfs_commit_info *cinfo, 6502d1426cSWeston Andros Adamson struct inode *inode); 661da177e4SLinus Torvalds 67e18b890bSChristoph Lameter static struct kmem_cache *nfs_wdata_cachep; 683feb2d49STrond Myklebust static mempool_t *nfs_wdata_mempool; 690b7c0153SFred Isaman static struct kmem_cache *nfs_cdata_cachep; 701da177e4SLinus Torvalds static mempool_t *nfs_commit_mempool; 711da177e4SLinus Torvalds 72515dcdcdSTrond Myklebust struct nfs_commit_data *nfs_commitdata_alloc(void) 731da177e4SLinus Torvalds { 74518662e0SNeilBrown struct nfs_commit_data *p; 7540859d7eSChuck Lever 76515dcdcdSTrond Myklebust p = kmem_cache_zalloc(nfs_cdata_cachep, nfs_io_gfp_mask()); 77515dcdcdSTrond Myklebust if (!p) { 78518662e0SNeilBrown p = mempool_alloc(nfs_commit_mempool, GFP_NOWAIT); 79518662e0SNeilBrown if (!p) 80518662e0SNeilBrown return NULL; 811da177e4SLinus Torvalds memset(p, 0, sizeof(*p)); 82515dcdcdSTrond Myklebust } 831da177e4SLinus Torvalds INIT_LIST_HEAD(&p->pages); 841da177e4SLinus Torvalds return p; 851da177e4SLinus Torvalds } 86e0c2b380SFred Isaman EXPORT_SYMBOL_GPL(nfs_commitdata_alloc); 871da177e4SLinus Torvalds 880b7c0153SFred Isaman void nfs_commit_free(struct nfs_commit_data *p) 891da177e4SLinus Torvalds { 901da177e4SLinus Torvalds mempool_free(p, nfs_commit_mempool); 911da177e4SLinus Torvalds } 92e0c2b380SFred Isaman EXPORT_SYMBOL_GPL(nfs_commit_free); 931da177e4SLinus Torvalds 941e7f3a48SWeston Andros Adamson static struct nfs_pgio_header *nfs_writehdr_alloc(void) 953feb2d49STrond Myklebust { 960bae835bSTrond Myklebust struct nfs_pgio_header *p; 973feb2d49STrond Myklebust 980bae835bSTrond Myklebust p = kmem_cache_zalloc(nfs_wdata_cachep, nfs_io_gfp_mask()); 990bae835bSTrond Myklebust if (!p) { 1000bae835bSTrond Myklebust p = mempool_alloc(nfs_wdata_mempool, GFP_NOWAIT); 1010bae835bSTrond Myklebust if (!p) 1020bae835bSTrond Myklebust return NULL; 1033feb2d49STrond Myklebust memset(p, 0, sizeof(*p)); 1040bae835bSTrond Myklebust } 105fbe77c30SBenjamin Coddington p->rw_mode = FMODE_WRITE; 1063feb2d49STrond Myklebust return p; 1073feb2d49STrond Myklebust } 1083feb2d49STrond Myklebust 1091e7f3a48SWeston Andros Adamson static void nfs_writehdr_free(struct nfs_pgio_header *hdr) 1106c75dc0dSFred Isaman { 1111e7f3a48SWeston Andros Adamson mempool_free(hdr, nfs_wdata_mempool); 1123feb2d49STrond Myklebust } 1131da177e4SLinus Torvalds 114919e3bd9STrond Myklebust static struct nfs_io_completion *nfs_io_completion_alloc(gfp_t gfp_flags) 115919e3bd9STrond Myklebust { 116919e3bd9STrond Myklebust return kmalloc(sizeof(struct nfs_io_completion), gfp_flags); 117919e3bd9STrond Myklebust } 118919e3bd9STrond Myklebust 119919e3bd9STrond Myklebust static void nfs_io_completion_init(struct nfs_io_completion *ioc, 120919e3bd9STrond Myklebust void (*complete)(void *), void *data) 121919e3bd9STrond Myklebust { 122919e3bd9STrond Myklebust ioc->complete = complete; 123919e3bd9STrond Myklebust ioc->data = data; 124919e3bd9STrond Myklebust kref_init(&ioc->refcount); 125919e3bd9STrond Myklebust } 126919e3bd9STrond Myklebust 127919e3bd9STrond Myklebust static void nfs_io_completion_release(struct kref *kref) 128919e3bd9STrond Myklebust { 129919e3bd9STrond Myklebust struct nfs_io_completion *ioc = container_of(kref, 130919e3bd9STrond Myklebust struct nfs_io_completion, refcount); 131919e3bd9STrond Myklebust ioc->complete(ioc->data); 132919e3bd9STrond Myklebust kfree(ioc); 133919e3bd9STrond Myklebust } 134919e3bd9STrond Myklebust 135919e3bd9STrond Myklebust static void nfs_io_completion_get(struct nfs_io_completion *ioc) 136919e3bd9STrond Myklebust { 137919e3bd9STrond Myklebust if (ioc != NULL) 138919e3bd9STrond Myklebust kref_get(&ioc->refcount); 139919e3bd9STrond Myklebust } 140919e3bd9STrond Myklebust 141919e3bd9STrond Myklebust static void nfs_io_completion_put(struct nfs_io_completion *ioc) 142919e3bd9STrond Myklebust { 143919e3bd9STrond Myklebust if (ioc != NULL) 144919e3bd9STrond Myklebust kref_put(&ioc->refcount, nfs_io_completion_release); 145919e3bd9STrond Myklebust } 146919e3bd9STrond Myklebust 1470c493b5cSTrond Myklebust /** 1487e8e78a0SChristoph Hellwig * nfs_folio_find_head_request - find head request associated with a folio 1490c493b5cSTrond Myklebust * @folio: pointer to folio 15084d3a9a9SWeston Andros Adamson * 15184d3a9a9SWeston Andros Adamson * must be called while holding the inode lock. 15284d3a9a9SWeston Andros Adamson * 15384d3a9a9SWeston Andros Adamson * returns matching head request with reference held, or NULL if not found. 15484d3a9a9SWeston Andros Adamson */ 1557e8e78a0SChristoph Hellwig static struct nfs_page *nfs_folio_find_head_request(struct folio *folio) 156277459d2STrond Myklebust { 1577e8e78a0SChristoph Hellwig struct address_space *mapping = folio->mapping; 158bd37d6fcSTrond Myklebust struct nfs_page *req; 159277459d2STrond Myklebust 1600c493b5cSTrond Myklebust if (!folio_test_private(folio)) 161b30d2f04STrond Myklebust return NULL; 162600f111eSMatthew Wilcox (Oracle) spin_lock(&mapping->i_private_lock); 16302e61ec1SChristoph Hellwig req = folio->private; 16484d3a9a9SWeston Andros Adamson if (req) { 16584d3a9a9SWeston Andros Adamson WARN_ON_ONCE(req->wb_head != req); 16629418aa4SMel Gorman kref_get(&req->wb_kref); 16784d3a9a9SWeston Andros Adamson } 168600f111eSMatthew Wilcox (Oracle) spin_unlock(&mapping->i_private_lock); 169b30d2f04STrond Myklebust return req; 170b30d2f04STrond Myklebust } 17129418aa4SMel Gorman 1721da177e4SLinus Torvalds /* Adjust the file length if we're writing beyond the end */ 1730c493b5cSTrond Myklebust static void nfs_grow_file(struct folio *folio, unsigned int offset, 1740c493b5cSTrond Myklebust unsigned int count) 1751da177e4SLinus Torvalds { 1767e8e78a0SChristoph Hellwig struct inode *inode = folio->mapping->host; 177a3d01454STrond Myklebust loff_t end, i_size; 178a3d01454STrond Myklebust pgoff_t end_index; 1791da177e4SLinus Torvalds 180a3d01454STrond Myklebust spin_lock(&inode->i_lock); 181a3d01454STrond Myklebust i_size = i_size_read(inode); 1820c493b5cSTrond Myklebust end_index = ((i_size - 1) >> folio_shift(folio)) << folio_order(folio); 1837e8e78a0SChristoph Hellwig if (i_size > 0 && folio->index < end_index) 184a3d01454STrond Myklebust goto out; 1850c493b5cSTrond Myklebust end = folio_file_pos(folio) + (loff_t)offset + (loff_t)count; 1861da177e4SLinus Torvalds if (i_size >= end) 187a3d01454STrond Myklebust goto out; 188110cb2d2SChuck Lever trace_nfs_size_grow(inode, end); 1891da177e4SLinus Torvalds i_size_write(inode, end); 190f6cdfa6dSTrond Myklebust NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_SIZE; 191a3d01454STrond Myklebust nfs_inc_stats(inode, NFSIOS_EXTENDWRITE); 192a3d01454STrond Myklebust out: 193e12912d9STrond Myklebust /* Atomically update timestamps if they are delegated to us. */ 194e12912d9STrond Myklebust nfs_update_delegated_mtime_locked(inode); 195a3d01454STrond Myklebust spin_unlock(&inode->i_lock); 196a6b5a28eSDave Wysochanski nfs_fscache_invalidate(inode, 0); 1971da177e4SLinus Torvalds } 1981da177e4SLinus Torvalds 199a301b777STrond Myklebust /* A writeback failed: mark the page as bad, and invalidate the page cache */ 200d2ceb7e5SBenjamin Coddington static void nfs_set_pageerror(struct address_space *mapping) 201a301b777STrond Myklebust { 2020df68cedSTrond Myklebust struct inode *inode = mapping->host; 2030df68cedSTrond Myklebust 204d2ceb7e5SBenjamin Coddington nfs_zap_mapping(mapping->host, mapping); 2050df68cedSTrond Myklebust /* Force file size revalidation */ 2060df68cedSTrond Myklebust spin_lock(&inode->i_lock); 207ac46b3d7STrond Myklebust nfs_set_cache_invalid(inode, NFS_INO_REVAL_FORCED | 20888a6099fSTrond Myklebust NFS_INO_INVALID_CHANGE | 209ac46b3d7STrond Myklebust NFS_INO_INVALID_SIZE); 2100df68cedSTrond Myklebust spin_unlock(&inode->i_lock); 211a301b777STrond Myklebust } 212a301b777STrond Myklebust 2130c493b5cSTrond Myklebust static void nfs_mapping_set_error(struct folio *folio, int error) 2146fbda89bSTrond Myklebust { 2157e8e78a0SChristoph Hellwig struct address_space *mapping = folio->mapping; 216b8946d7bSTrond Myklebust 2170c493b5cSTrond Myklebust folio_set_error(folio); 2186c984083STrond Myklebust filemap_set_wb_err(mapping, error); 2196c984083STrond Myklebust if (mapping->host) 2206c984083STrond Myklebust errseq_set(&mapping->host->i_sb->s_wb_err, 2216c984083STrond Myklebust error == -ENOSPC ? -ENOSPC : -EIO); 222b8946d7bSTrond Myklebust nfs_set_pageerror(mapping); 2236fbda89bSTrond Myklebust } 2246fbda89bSTrond Myklebust 225d72ddcbaSWeston Andros Adamson /* 226d72ddcbaSWeston Andros Adamson * nfs_page_group_search_locked 227d72ddcbaSWeston Andros Adamson * @head - head request of page group 228d72ddcbaSWeston Andros Adamson * @page_offset - offset into page 229d72ddcbaSWeston Andros Adamson * 230d72ddcbaSWeston Andros Adamson * Search page group with head @head to find a request that contains the 231d72ddcbaSWeston Andros Adamson * page offset @page_offset. 232d72ddcbaSWeston Andros Adamson * 233d72ddcbaSWeston Andros Adamson * Returns a pointer to the first matching nfs request, or NULL if no 234d72ddcbaSWeston Andros Adamson * match is found. 235d72ddcbaSWeston Andros Adamson * 236d72ddcbaSWeston Andros Adamson * Must be called with the page group lock held 237d72ddcbaSWeston Andros Adamson */ 238d72ddcbaSWeston Andros Adamson static struct nfs_page * 239d72ddcbaSWeston Andros Adamson nfs_page_group_search_locked(struct nfs_page *head, unsigned int page_offset) 240d72ddcbaSWeston Andros Adamson { 241d72ddcbaSWeston Andros Adamson struct nfs_page *req; 242d72ddcbaSWeston Andros Adamson 243d72ddcbaSWeston Andros Adamson req = head; 244d72ddcbaSWeston Andros Adamson do { 245d72ddcbaSWeston Andros Adamson if (page_offset >= req->wb_pgbase && 246d72ddcbaSWeston Andros Adamson page_offset < (req->wb_pgbase + req->wb_bytes)) 247d72ddcbaSWeston Andros Adamson return req; 248d72ddcbaSWeston Andros Adamson 249d72ddcbaSWeston Andros Adamson req = req->wb_this_page; 250d72ddcbaSWeston Andros Adamson } while (req != head); 251d72ddcbaSWeston Andros Adamson 252d72ddcbaSWeston Andros Adamson return NULL; 253d72ddcbaSWeston Andros Adamson } 254d72ddcbaSWeston Andros Adamson 255d72ddcbaSWeston Andros Adamson /* 256d72ddcbaSWeston Andros Adamson * nfs_page_group_covers_page 257d72ddcbaSWeston Andros Adamson * @head - head request of page group 258d72ddcbaSWeston Andros Adamson * 259d72ddcbaSWeston Andros Adamson * Return true if the page group with head @head covers the whole page, 260d72ddcbaSWeston Andros Adamson * returns false otherwise 261d72ddcbaSWeston Andros Adamson */ 262d72ddcbaSWeston Andros Adamson static bool nfs_page_group_covers_page(struct nfs_page *req) 263d72ddcbaSWeston Andros Adamson { 2640c493b5cSTrond Myklebust unsigned int len = nfs_folio_length(nfs_page_to_folio(req)); 265d72ddcbaSWeston Andros Adamson struct nfs_page *tmp; 266d72ddcbaSWeston Andros Adamson unsigned int pos = 0; 267d72ddcbaSWeston Andros Adamson 2681344b7eaSTrond Myklebust nfs_page_group_lock(req); 269d72ddcbaSWeston Andros Adamson 2707e8a30f8STrond Myklebust for (;;) { 271d72ddcbaSWeston Andros Adamson tmp = nfs_page_group_search_locked(req->wb_head, pos); 2727e8a30f8STrond Myklebust if (!tmp) 2737e8a30f8STrond Myklebust break; 2747e8a30f8STrond Myklebust pos = tmp->wb_pgbase + tmp->wb_bytes; 275d72ddcbaSWeston Andros Adamson } 276d72ddcbaSWeston Andros Adamson 277d72ddcbaSWeston Andros Adamson nfs_page_group_unlock(req); 2787e8a30f8STrond Myklebust return pos >= len; 279d72ddcbaSWeston Andros Adamson } 280d72ddcbaSWeston Andros Adamson 2811da177e4SLinus Torvalds /* We can set the PG_uptodate flag if we see that a write request 2821da177e4SLinus Torvalds * covers the full page. 2831da177e4SLinus Torvalds */ 284d72ddcbaSWeston Andros Adamson static void nfs_mark_uptodate(struct nfs_page *req) 2851da177e4SLinus Torvalds { 2860c493b5cSTrond Myklebust struct folio *folio = nfs_page_to_folio(req); 2870c493b5cSTrond Myklebust 2880c493b5cSTrond Myklebust if (folio_test_uptodate(folio)) 2891da177e4SLinus Torvalds return; 290d72ddcbaSWeston Andros Adamson if (!nfs_page_group_covers_page(req)) 2911da177e4SLinus Torvalds return; 2920c493b5cSTrond Myklebust folio_mark_uptodate(folio); 2931da177e4SLinus Torvalds } 2941da177e4SLinus Torvalds 2951da177e4SLinus Torvalds static int wb_priority(struct writeback_control *wbc) 2961da177e4SLinus Torvalds { 297e87b4c7aSNeilBrown int ret = 0; 298cca588d6STrond Myklebust 299e87b4c7aSNeilBrown if (wbc->sync_mode == WB_SYNC_ALL) 300e87b4c7aSNeilBrown ret = FLUSH_COND_STABLE; 301e87b4c7aSNeilBrown return ret; 3021da177e4SLinus Torvalds } 3031da177e4SLinus Torvalds 3041da177e4SLinus Torvalds /* 30589a09141SPeter Zijlstra * NFS congestion control 30689a09141SPeter Zijlstra */ 30789a09141SPeter Zijlstra 30889a09141SPeter Zijlstra int nfs_congestion_kb; 30989a09141SPeter Zijlstra 31089a09141SPeter Zijlstra #define NFS_CONGESTION_ON_THRESH (nfs_congestion_kb >> (PAGE_SHIFT-10)) 31189a09141SPeter Zijlstra #define NFS_CONGESTION_OFF_THRESH \ 31289a09141SPeter Zijlstra (NFS_CONGESTION_ON_THRESH - (NFS_CONGESTION_ON_THRESH >> 2)) 31389a09141SPeter Zijlstra 3140c493b5cSTrond Myklebust static void nfs_folio_set_writeback(struct folio *folio) 31589a09141SPeter Zijlstra { 3167e8e78a0SChristoph Hellwig struct nfs_server *nfss = NFS_SERVER(folio->mapping->host); 3175a6d41b3STrond Myklebust 3180c493b5cSTrond Myklebust folio_start_writeback(folio); 3190c493b5cSTrond Myklebust if (atomic_long_inc_return(&nfss->writeback) > NFS_CONGESTION_ON_THRESH) 3206df25e58SNeilBrown nfss->write_congested = 1; 32189a09141SPeter Zijlstra } 32289a09141SPeter Zijlstra 3230c493b5cSTrond Myklebust static void nfs_folio_end_writeback(struct folio *folio) 32489a09141SPeter Zijlstra { 3257e8e78a0SChristoph Hellwig struct nfs_server *nfss = NFS_SERVER(folio->mapping->host); 32689a09141SPeter Zijlstra 3270c493b5cSTrond Myklebust folio_end_writeback(folio); 3280c493b5cSTrond Myklebust if (atomic_long_dec_return(&nfss->writeback) < 3292f1f3104SJan Kara NFS_CONGESTION_OFF_THRESH) { 3306df25e58SNeilBrown nfss->write_congested = 0; 3312f1f3104SJan Kara wake_up_all(&nfss->write_congestion_wait); 3322f1f3104SJan Kara } 33389a09141SPeter Zijlstra } 33489a09141SPeter Zijlstra 3350c493b5cSTrond Myklebust static void nfs_page_end_writeback(struct nfs_page *req) 3360c493b5cSTrond Myklebust { 3370c493b5cSTrond Myklebust if (nfs_page_group_sync_on_bit(req, PG_WB_END)) { 3380c493b5cSTrond Myklebust nfs_unlock_request(req); 3390c493b5cSTrond Myklebust nfs_folio_end_writeback(nfs_page_to_folio(req)); 3400c493b5cSTrond Myklebust } else 3410c493b5cSTrond Myklebust nfs_unlock_request(req); 3420c493b5cSTrond Myklebust } 3430c493b5cSTrond Myklebust 344d4581383SWeston Andros Adamson /* 345d4581383SWeston Andros Adamson * nfs_destroy_unlinked_subrequests - destroy recently unlinked subrequests 346d4581383SWeston Andros Adamson * 347d4581383SWeston Andros Adamson * @destroy_list - request list (using wb_this_page) terminated by @old_head 348d4581383SWeston Andros Adamson * @old_head - the old head of the list 349d4581383SWeston Andros Adamson * 350d4581383SWeston Andros Adamson * All subrequests must be locked and removed from all lists, so at this point 351d4581383SWeston Andros Adamson * they are only "active" in this function, and possibly in nfs_wait_on_request 352d4581383SWeston Andros Adamson * with a reference held by some other context. 353d4581383SWeston Andros Adamson */ 354d4581383SWeston Andros Adamson static void 355d4581383SWeston Andros Adamson nfs_destroy_unlinked_subrequests(struct nfs_page *destroy_list, 356b66aaa8dSTrond Myklebust struct nfs_page *old_head, 357b66aaa8dSTrond Myklebust struct inode *inode) 358d4581383SWeston Andros Adamson { 359d4581383SWeston Andros Adamson while (destroy_list) { 360d4581383SWeston Andros Adamson struct nfs_page *subreq = destroy_list; 361d4581383SWeston Andros Adamson 362d4581383SWeston Andros Adamson destroy_list = (subreq->wb_this_page == old_head) ? 363d4581383SWeston Andros Adamson NULL : subreq->wb_this_page; 364d4581383SWeston Andros Adamson 36508ca8b21STrond Myklebust /* Note: lock subreq in order to change subreq->wb_head */ 36608ca8b21STrond Myklebust nfs_page_set_headlock(subreq); 367d4581383SWeston Andros Adamson WARN_ON_ONCE(old_head != subreq->wb_head); 368d4581383SWeston Andros Adamson 369d4581383SWeston Andros Adamson /* make sure old group is not used */ 370d4581383SWeston Andros Adamson subreq->wb_this_page = subreq; 37108ca8b21STrond Myklebust subreq->wb_head = subreq; 372d4581383SWeston Andros Adamson 373902a4c00STrond Myklebust clear_bit(PG_REMOVE, &subreq->wb_flags); 374902a4c00STrond Myklebust 3755b2b5187STrond Myklebust /* Note: races with nfs_page_group_destroy() */ 3765b2b5187STrond Myklebust if (!kref_read(&subreq->wb_kref)) { 3775b2b5187STrond Myklebust /* Check if we raced with nfs_page_group_destroy() */ 37808ca8b21STrond Myklebust if (test_and_clear_bit(PG_TEARDOWN, &subreq->wb_flags)) { 37908ca8b21STrond Myklebust nfs_page_clear_headlock(subreq); 3805b2b5187STrond Myklebust nfs_free_request(subreq); 38108ca8b21STrond Myklebust } else 38208ca8b21STrond Myklebust nfs_page_clear_headlock(subreq); 3835b2b5187STrond Myklebust continue; 3845b2b5187STrond Myklebust } 38508ca8b21STrond Myklebust nfs_page_clear_headlock(subreq); 386d4581383SWeston Andros Adamson 387add42de3STrond Myklebust nfs_release_request(old_head); 3885b2b5187STrond Myklebust 389b66aaa8dSTrond Myklebust if (test_and_clear_bit(PG_INODE_REF, &subreq->wb_flags)) { 390d4581383SWeston Andros Adamson nfs_release_request(subreq); 391a6b6d5b8STrond Myklebust atomic_long_dec(&NFS_I(inode)->nrequests); 392d4581383SWeston Andros Adamson } 3935b2b5187STrond Myklebust 3945b2b5187STrond Myklebust /* subreq is now totally disconnected from page group or any 3955b2b5187STrond Myklebust * write / commit lists. last chance to wake any waiters */ 3965b2b5187STrond Myklebust nfs_unlock_and_release_request(subreq); 397d4581383SWeston Andros Adamson } 398d4581383SWeston Andros Adamson } 399d4581383SWeston Andros Adamson 400d4581383SWeston Andros Adamson /* 401e00ed89dSTrond Myklebust * nfs_join_page_group - destroy subrequests of the head req 402e00ed89dSTrond Myklebust * @head: the page used to lookup the "page group" of nfs_page structures 403e00ed89dSTrond Myklebust * @inode: Inode to which the request belongs. 404d4581383SWeston Andros Adamson * 405d4581383SWeston Andros Adamson * This function joins all sub requests to the head request by first 406d4581383SWeston Andros Adamson * locking all requests in the group, cancelling any pending operations 407d4581383SWeston Andros Adamson * and finally updating the head request to cover the whole range covered by 408d4581383SWeston Andros Adamson * the (former) group. All subrequests are removed from any write or commit 409d4581383SWeston Andros Adamson * lists, unlinked from the group and destroyed. 410d4581383SWeston Andros Adamson */ 411b193a78dSTrond Myklebust void nfs_join_page_group(struct nfs_page *head, struct nfs_commit_info *cinfo, 412b193a78dSTrond Myklebust struct inode *inode) 413d4581383SWeston Andros Adamson { 414e00ed89dSTrond Myklebust struct nfs_page *subreq; 415d4581383SWeston Andros Adamson struct nfs_page *destroy_list = NULL; 416a62f8e3bSTrond Myklebust unsigned int pgbase, off, bytes; 417a62f8e3bSTrond Myklebust 418a62f8e3bSTrond Myklebust pgbase = head->wb_pgbase; 419a62f8e3bSTrond Myklebust bytes = head->wb_bytes; 420a62f8e3bSTrond Myklebust off = head->wb_offset; 421a0e265bcSTrond Myklebust for (subreq = head->wb_this_page; subreq != head; 422a0e265bcSTrond Myklebust subreq = subreq->wb_this_page) { 423a62f8e3bSTrond Myklebust /* Subrequests should always form a contiguous range */ 424a62f8e3bSTrond Myklebust if (pgbase > subreq->wb_pgbase) { 425a62f8e3bSTrond Myklebust off -= pgbase - subreq->wb_pgbase; 426a62f8e3bSTrond Myklebust bytes += pgbase - subreq->wb_pgbase; 427a62f8e3bSTrond Myklebust pgbase = subreq->wb_pgbase; 428a62f8e3bSTrond Myklebust } 429a62f8e3bSTrond Myklebust bytes = max(subreq->wb_pgbase + subreq->wb_bytes 430a62f8e3bSTrond Myklebust - pgbase, bytes); 4311bd5d6d0STrond Myklebust } 4321bd5d6d0STrond Myklebust 433a62f8e3bSTrond Myklebust /* Set the head request's range to cover the former page group */ 434a62f8e3bSTrond Myklebust head->wb_pgbase = pgbase; 435a62f8e3bSTrond Myklebust head->wb_bytes = bytes; 436a62f8e3bSTrond Myklebust head->wb_offset = off; 437d4581383SWeston Andros Adamson 438d4581383SWeston Andros Adamson /* Now that all requests are locked, make sure they aren't on any list. 439d4581383SWeston Andros Adamson * Commit list removal accounting is done after locks are dropped */ 440d4581383SWeston Andros Adamson subreq = head; 441d4581383SWeston Andros Adamson do { 442b193a78dSTrond Myklebust nfs_clear_request_commit(cinfo, subreq); 443d4581383SWeston Andros Adamson subreq = subreq->wb_this_page; 444d4581383SWeston Andros Adamson } while (subreq != head); 445d4581383SWeston Andros Adamson 446d4581383SWeston Andros Adamson /* unlink subrequests from head, destroy them later */ 447d4581383SWeston Andros Adamson if (head->wb_this_page != head) { 448d4581383SWeston Andros Adamson /* destroy list will be terminated by head */ 449d4581383SWeston Andros Adamson destroy_list = head->wb_this_page; 450d4581383SWeston Andros Adamson head->wb_this_page = head; 451d4581383SWeston Andros Adamson } 452d4581383SWeston Andros Adamson 453b66aaa8dSTrond Myklebust nfs_destroy_unlinked_subrequests(destroy_list, head, inode); 454b5bab9bfSTrond Myklebust } 455b5bab9bfSTrond Myklebust 456f1b7c755SChristoph Hellwig /** 457f1b7c755SChristoph Hellwig * nfs_wait_on_request - Wait for a request to complete. 458f1b7c755SChristoph Hellwig * @req: request to wait upon. 459f1b7c755SChristoph Hellwig * 460f1b7c755SChristoph Hellwig * Interruptible by fatal signals only. 461f1b7c755SChristoph Hellwig * The user is responsible for holding a count on the request. 462f1b7c755SChristoph Hellwig */ 463f1b7c755SChristoph Hellwig static int nfs_wait_on_request(struct nfs_page *req) 464f1b7c755SChristoph Hellwig { 465f1b7c755SChristoph Hellwig if (!test_bit(PG_BUSY, &req->wb_flags)) 466f1b7c755SChristoph Hellwig return 0; 467f1b7c755SChristoph Hellwig set_bit(PG_CONTENDED2, &req->wb_flags); 468f1b7c755SChristoph Hellwig smp_mb__after_atomic(); 469f1b7c755SChristoph Hellwig return wait_on_bit_io(&req->wb_flags, PG_BUSY, 470f1b7c755SChristoph Hellwig TASK_UNINTERRUPTIBLE); 471f1b7c755SChristoph Hellwig } 472f1b7c755SChristoph Hellwig 473e00ed89dSTrond Myklebust /* 47425edbcacSChristoph Hellwig * nfs_unroll_locks - unlock all newly locked reqs and wait on @req 47525edbcacSChristoph Hellwig * @head: head request of page group, must be holding head lock 47625edbcacSChristoph Hellwig * @req: request that couldn't lock and needs to wait on the req bit lock 47725edbcacSChristoph Hellwig * 47825edbcacSChristoph Hellwig * This is a helper function for nfs_lock_and_join_requests 47925edbcacSChristoph Hellwig * returns 0 on success, < 0 on error. 48025edbcacSChristoph Hellwig */ 48125edbcacSChristoph Hellwig static void 48225edbcacSChristoph Hellwig nfs_unroll_locks(struct nfs_page *head, struct nfs_page *req) 48325edbcacSChristoph Hellwig { 48425edbcacSChristoph Hellwig struct nfs_page *tmp; 48525edbcacSChristoph Hellwig 48625edbcacSChristoph Hellwig /* relinquish all the locks successfully grabbed this run */ 48725edbcacSChristoph Hellwig for (tmp = head->wb_this_page ; tmp != req; tmp = tmp->wb_this_page) { 48825edbcacSChristoph Hellwig if (!kref_read(&tmp->wb_kref)) 48925edbcacSChristoph Hellwig continue; 49025edbcacSChristoph Hellwig nfs_unlock_and_release_request(tmp); 49125edbcacSChristoph Hellwig } 49225edbcacSChristoph Hellwig } 49325edbcacSChristoph Hellwig 49425edbcacSChristoph Hellwig /* 49525edbcacSChristoph Hellwig * nfs_page_group_lock_subreq - try to lock a subrequest 49625edbcacSChristoph Hellwig * @head: head request of page group 49725edbcacSChristoph Hellwig * @subreq: request to lock 49825edbcacSChristoph Hellwig * 49925edbcacSChristoph Hellwig * This is a helper function for nfs_lock_and_join_requests which 50025edbcacSChristoph Hellwig * must be called with the head request and page group both locked. 50125edbcacSChristoph Hellwig * On error, it returns with the page group unlocked. 50225edbcacSChristoph Hellwig */ 50325edbcacSChristoph Hellwig static int 50425edbcacSChristoph Hellwig nfs_page_group_lock_subreq(struct nfs_page *head, struct nfs_page *subreq) 50525edbcacSChristoph Hellwig { 50625edbcacSChristoph Hellwig int ret; 50725edbcacSChristoph Hellwig 50825edbcacSChristoph Hellwig if (!kref_get_unless_zero(&subreq->wb_kref)) 50925edbcacSChristoph Hellwig return 0; 51025edbcacSChristoph Hellwig while (!nfs_lock_request(subreq)) { 51125edbcacSChristoph Hellwig nfs_page_group_unlock(head); 51225edbcacSChristoph Hellwig ret = nfs_wait_on_request(subreq); 51325edbcacSChristoph Hellwig if (!ret) 51425edbcacSChristoph Hellwig ret = nfs_page_group_lock(head); 51525edbcacSChristoph Hellwig if (ret < 0) { 51625edbcacSChristoph Hellwig nfs_unroll_locks(head, subreq); 51725edbcacSChristoph Hellwig nfs_release_request(subreq); 51825edbcacSChristoph Hellwig return ret; 51925edbcacSChristoph Hellwig } 52025edbcacSChristoph Hellwig } 52125edbcacSChristoph Hellwig return 0; 52225edbcacSChristoph Hellwig } 52325edbcacSChristoph Hellwig 52425edbcacSChristoph Hellwig /* 525e00ed89dSTrond Myklebust * nfs_lock_and_join_requests - join all subreqs to the head req 5260c493b5cSTrond Myklebust * @folio: the folio used to lookup the "page group" of nfs_page structures 527e00ed89dSTrond Myklebust * 528e00ed89dSTrond Myklebust * This function joins all sub requests to the head request by first 529e00ed89dSTrond Myklebust * locking all requests in the group, cancelling any pending operations 530e00ed89dSTrond Myklebust * and finally updating the head request to cover the whole range covered by 531e00ed89dSTrond Myklebust * the (former) group. All subrequests are removed from any write or commit 532e00ed89dSTrond Myklebust * lists, unlinked from the group and destroyed. 533e00ed89dSTrond Myklebust * 534e00ed89dSTrond Myklebust * Returns a locked, referenced pointer to the head request - which after 535e00ed89dSTrond Myklebust * this call is guaranteed to be the only request associated with the page. 5360c493b5cSTrond Myklebust * Returns NULL if no requests are found for @folio, or a ERR_PTR if an 537e00ed89dSTrond Myklebust * error was encountered. 538e00ed89dSTrond Myklebust */ 5390c493b5cSTrond Myklebust static struct nfs_page *nfs_lock_and_join_requests(struct folio *folio) 540e00ed89dSTrond Myklebust { 5417e8e78a0SChristoph Hellwig struct inode *inode = folio->mapping->host; 54225edbcacSChristoph Hellwig struct nfs_page *head, *subreq; 543b193a78dSTrond Myklebust struct nfs_commit_info cinfo; 544*b571cfcbSChristoph Hellwig bool removed; 545e00ed89dSTrond Myklebust int ret; 546e00ed89dSTrond Myklebust 547e00ed89dSTrond Myklebust /* 548e00ed89dSTrond Myklebust * A reference is taken only on the head request which acts as a 549e00ed89dSTrond Myklebust * reference to the whole page group - the group will not be destroyed 550e00ed89dSTrond Myklebust * until the head reference is released. 551e00ed89dSTrond Myklebust */ 552c3f22357SChristoph Hellwig retry: 553c3f22357SChristoph Hellwig head = nfs_folio_find_head_request(folio); 554c3f22357SChristoph Hellwig if (!head) 555c3f22357SChristoph Hellwig return NULL; 5560671d8f1SMarkus Elfring 557c3f22357SChristoph Hellwig while (!nfs_lock_request(head)) { 558c3f22357SChristoph Hellwig ret = nfs_wait_on_request(head); 559c3f22357SChristoph Hellwig if (ret < 0) 5600671d8f1SMarkus Elfring return ERR_PTR(ret); 561612c9384STrond Myklebust } 562074cc1deSTrond Myklebust 563c3f22357SChristoph Hellwig /* Ensure that nobody removed the request before we locked it */ 564c3f22357SChristoph Hellwig if (head != folio->private) { 565c3f22357SChristoph Hellwig nfs_unlock_and_release_request(head); 566c3f22357SChristoph Hellwig goto retry; 567c3f22357SChristoph Hellwig } 568e00ed89dSTrond Myklebust 56925edbcacSChristoph Hellwig ret = nfs_page_group_lock(head); 570c3f22357SChristoph Hellwig if (ret < 0) 571c3f22357SChristoph Hellwig goto out_unlock; 572c3f22357SChristoph Hellwig 573*b571cfcbSChristoph Hellwig removed = test_bit(PG_REMOVE, &head->wb_flags); 574*b571cfcbSChristoph Hellwig 57525edbcacSChristoph Hellwig /* lock each request in the page group */ 57625edbcacSChristoph Hellwig for (subreq = head->wb_this_page; 57725edbcacSChristoph Hellwig subreq != head; 57825edbcacSChristoph Hellwig subreq = subreq->wb_this_page) { 579*b571cfcbSChristoph Hellwig if (test_bit(PG_REMOVE, &subreq->wb_flags)) 580*b571cfcbSChristoph Hellwig removed = true; 58125edbcacSChristoph Hellwig ret = nfs_page_group_lock_subreq(head, subreq); 58225edbcacSChristoph Hellwig if (ret < 0) 58325edbcacSChristoph Hellwig goto out_unlock; 58425edbcacSChristoph Hellwig } 58525edbcacSChristoph Hellwig 58625edbcacSChristoph Hellwig nfs_page_group_unlock(head); 58725edbcacSChristoph Hellwig 588*b571cfcbSChristoph Hellwig /* 589*b571cfcbSChristoph Hellwig * If PG_REMOVE is set on any request, I/O on that request has 590*b571cfcbSChristoph Hellwig * completed, but some requests were still under I/O at the time 591*b571cfcbSChristoph Hellwig * we locked the head request. 592*b571cfcbSChristoph Hellwig * 593*b571cfcbSChristoph Hellwig * In that case the above wait for all requests means that all I/O 594*b571cfcbSChristoph Hellwig * has now finished, and we can restart from a clean slate. Let the 595*b571cfcbSChristoph Hellwig * old requests go away and start from scratch instead. 596*b571cfcbSChristoph Hellwig */ 597*b571cfcbSChristoph Hellwig if (removed) { 598*b571cfcbSChristoph Hellwig nfs_unroll_locks(head, head); 599*b571cfcbSChristoph Hellwig nfs_unlock_and_release_request(head); 600*b571cfcbSChristoph Hellwig goto retry; 601*b571cfcbSChristoph Hellwig } 602*b571cfcbSChristoph Hellwig 603c3f22357SChristoph Hellwig nfs_init_cinfo_from_inode(&cinfo, inode); 604c3f22357SChristoph Hellwig nfs_join_page_group(head, &cinfo, inode); 605e00ed89dSTrond Myklebust return head; 606c3f22357SChristoph Hellwig 607c3f22357SChristoph Hellwig out_unlock: 608c3f22357SChristoph Hellwig nfs_unlock_and_release_request(head); 609c3f22357SChristoph Hellwig return ERR_PTR(ret); 610e00ed89dSTrond Myklebust } 611e00ed89dSTrond Myklebust 6126fbda89bSTrond Myklebust static void nfs_write_error(struct nfs_page *req, int error) 6130bcbf039SPeng Tao { 6146dd85e83STrond Myklebust trace_nfs_write_error(nfs_page_to_inode(req), req, error); 6150c493b5cSTrond Myklebust nfs_mapping_set_error(nfs_page_to_folio(req), error); 61606c9fdf3STrond Myklebust nfs_inode_remove_request(req); 6170c493b5cSTrond Myklebust nfs_page_end_writeback(req); 6181f84ccdfSFred Isaman nfs_release_request(req); 6190bcbf039SPeng Tao } 6200bcbf039SPeng Tao 621074cc1deSTrond Myklebust /* 622074cc1deSTrond Myklebust * Find an associated nfs write request, and prepare to flush it out 623074cc1deSTrond Myklebust * May return an error if the user signalled nfs_wait_on_request(). 624074cc1deSTrond Myklebust */ 6250c493b5cSTrond Myklebust static int nfs_page_async_flush(struct folio *folio, 626c6fd3511STrond Myklebust struct writeback_control *wbc, 627c6fd3511STrond Myklebust struct nfs_pageio_descriptor *pgio) 628074cc1deSTrond Myklebust { 629074cc1deSTrond Myklebust struct nfs_page *req; 630074cc1deSTrond Myklebust int ret = 0; 631074cc1deSTrond Myklebust 6320c493b5cSTrond Myklebust req = nfs_lock_and_join_requests(folio); 633074cc1deSTrond Myklebust if (!req) 634074cc1deSTrond Myklebust goto out; 635074cc1deSTrond Myklebust ret = PTR_ERR(req); 636074cc1deSTrond Myklebust if (IS_ERR(req)) 637074cc1deSTrond Myklebust goto out; 638074cc1deSTrond Myklebust 6390c493b5cSTrond Myklebust nfs_folio_set_writeback(folio); 640deed85e7STrond Myklebust WARN_ON_ONCE(test_bit(PG_CLEAN, &req->wb_flags)); 641074cc1deSTrond Myklebust 642a6598813STrond Myklebust /* If there is a fatal error that covers this write, just exit */ 64396c41455STrond Myklebust ret = pgio->pg_error; 64496c41455STrond Myklebust if (nfs_error_is_fatal_on_server(ret)) 645a6598813STrond Myklebust goto out_launder; 646a6598813STrond Myklebust 64796c41455STrond Myklebust ret = 0; 648f8512ad0SFred Isaman if (!nfs_pageio_add_request(pgio, req)) { 649074cc1deSTrond Myklebust ret = pgio->pg_error; 6500bcbf039SPeng Tao /* 651c373fff7STrond Myklebust * Remove the problematic req upon fatal errors on the server 6520bcbf039SPeng Tao */ 653c373fff7STrond Myklebust if (nfs_error_is_fatal_on_server(ret)) 654a6598813STrond Myklebust goto out_launder; 655c6fd3511STrond Myklebust if (wbc->sync_mode == WB_SYNC_NONE) 656c6fd3511STrond Myklebust ret = AOP_WRITEPAGE_ACTIVATE; 6570c493b5cSTrond Myklebust folio_redirty_for_writepage(wbc, folio); 6588fc75bedSTrond Myklebust nfs_redirty_request(req); 65996c41455STrond Myklebust pgio->pg_error = 0; 66040f90271STrond Myklebust } else 6617e8e78a0SChristoph Hellwig nfs_add_stats(folio->mapping->host, 66240f90271STrond Myklebust NFSIOS_WRITEPAGES, 1); 663074cc1deSTrond Myklebust out: 664074cc1deSTrond Myklebust return ret; 665a6598813STrond Myklebust out_launder: 6666fbda89bSTrond Myklebust nfs_write_error(req, ret); 66714bebe3cSTrond Myklebust return 0; 668e261f51fSTrond Myklebust } 669e261f51fSTrond Myklebust 6700c493b5cSTrond Myklebust static int nfs_do_writepage(struct folio *folio, struct writeback_control *wbc, 671c373fff7STrond Myklebust struct nfs_pageio_descriptor *pgio) 672f758c885STrond Myklebust { 6737e8e78a0SChristoph Hellwig nfs_pageio_cond_complete(pgio, folio->index); 6740c493b5cSTrond Myklebust return nfs_page_async_flush(folio, wbc, pgio); 675f758c885STrond Myklebust } 676f758c885STrond Myklebust 677e261f51fSTrond Myklebust /* 6781da177e4SLinus Torvalds * Write an mmapped page to the server. 6791da177e4SLinus Torvalds */ 6800c493b5cSTrond Myklebust static int nfs_writepage_locked(struct folio *folio, 681c373fff7STrond Myklebust struct writeback_control *wbc) 6821da177e4SLinus Torvalds { 683f758c885STrond Myklebust struct nfs_pageio_descriptor pgio; 6847e8e78a0SChristoph Hellwig struct inode *inode = folio->mapping->host; 685e261f51fSTrond Myklebust int err; 6861da177e4SLinus Torvalds 68740f90271STrond Myklebust nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE); 6880c493b5cSTrond Myklebust nfs_pageio_init_write(&pgio, inode, 0, false, 6890c493b5cSTrond Myklebust &nfs_async_write_completion_ops); 6900c493b5cSTrond Myklebust err = nfs_do_writepage(folio, wbc, &pgio); 69196c41455STrond Myklebust pgio.pg_error = 0; 692f758c885STrond Myklebust nfs_pageio_complete(&pgio); 6934d770ccfSTrond Myklebust return err; 6944d770ccfSTrond Myklebust } 6954d770ccfSTrond Myklebust 696d585bdbeSMatthew Wilcox (Oracle) static int nfs_writepages_callback(struct folio *folio, 6970c493b5cSTrond Myklebust struct writeback_control *wbc, void *data) 698f758c885STrond Myklebust { 699f758c885STrond Myklebust int ret; 700f758c885STrond Myklebust 7010c493b5cSTrond Myklebust ret = nfs_do_writepage(folio, wbc, data); 70296c41455STrond Myklebust if (ret != AOP_WRITEPAGE_ACTIVATE) 703d585bdbeSMatthew Wilcox (Oracle) folio_unlock(folio); 704f758c885STrond Myklebust return ret; 7051da177e4SLinus Torvalds } 7061da177e4SLinus Torvalds 707919e3bd9STrond Myklebust static void nfs_io_completion_commit(void *inode) 708919e3bd9STrond Myklebust { 709919e3bd9STrond Myklebust nfs_commit_inode(inode, 0); 710919e3bd9STrond Myklebust } 711919e3bd9STrond Myklebust 7121da177e4SLinus Torvalds int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc) 7131da177e4SLinus Torvalds { 7141da177e4SLinus Torvalds struct inode *inode = mapping->host; 715c63c7b05STrond Myklebust struct nfs_pageio_descriptor pgio; 716ed7bcdb3STrond Myklebust struct nfs_io_completion *ioc = NULL; 717ed7bcdb3STrond Myklebust unsigned int mntflags = NFS_SERVER(inode)->flags; 7182f1f3104SJan Kara struct nfs_server *nfss = NFS_SERVER(inode); 719ed7bcdb3STrond Myklebust int priority = 0; 7201da177e4SLinus Torvalds int err; 7211da177e4SLinus Torvalds 7222f1f3104SJan Kara /* Wait with writeback until write congestion eases */ 7232f1f3104SJan Kara if (wbc->sync_mode == WB_SYNC_NONE && nfss->write_congested) { 7242f1f3104SJan Kara err = wait_event_killable(nfss->write_congestion_wait, 7252f1f3104SJan Kara nfss->write_congested == 0); 7262f1f3104SJan Kara if (err) 7272f1f3104SJan Kara return err; 7282f1f3104SJan Kara } 7296df25e58SNeilBrown 73091d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES); 73191d5b470SChuck Lever 732ed7bcdb3STrond Myklebust if (!(mntflags & NFS_MOUNT_WRITE_EAGER) || wbc->for_kupdate || 733ed7bcdb3STrond Myklebust wbc->for_background || wbc->for_sync || wbc->for_reclaim) { 7342b17d725STrond Myklebust ioc = nfs_io_completion_alloc(GFP_KERNEL); 735919e3bd9STrond Myklebust if (ioc) 736ed7bcdb3STrond Myklebust nfs_io_completion_init(ioc, nfs_io_completion_commit, 737ed7bcdb3STrond Myklebust inode); 738ed7bcdb3STrond Myklebust priority = wb_priority(wbc); 739ed7bcdb3STrond Myklebust } 740919e3bd9STrond Myklebust 741c6fd3511STrond Myklebust do { 742ed7bcdb3STrond Myklebust nfs_pageio_init_write(&pgio, inode, priority, false, 743a20c93e3SChristoph Hellwig &nfs_async_write_completion_ops); 744919e3bd9STrond Myklebust pgio.pg_io_completion = ioc; 745c6fd3511STrond Myklebust err = write_cache_pages(mapping, wbc, nfs_writepages_callback, 746c6fd3511STrond Myklebust &pgio); 74796c41455STrond Myklebust pgio.pg_error = 0; 748c63c7b05STrond Myklebust nfs_pageio_complete(&pgio); 7496e7434abSTrond Myklebust if (err == -EAGAIN && mntflags & NFS_MOUNT_SOFTERR) 7506e7434abSTrond Myklebust break; 751c6fd3511STrond Myklebust } while (err < 0 && !nfs_error_is_fatal(err)); 752919e3bd9STrond Myklebust nfs_io_completion_put(ioc); 75372cb77f4STrond Myklebust 754f758c885STrond Myklebust if (err < 0) 75572cb77f4STrond Myklebust goto out_err; 756c63c7b05STrond Myklebust return 0; 75772cb77f4STrond Myklebust out_err: 75872cb77f4STrond Myklebust return err; 7591da177e4SLinus Torvalds } 7601da177e4SLinus Torvalds 7611da177e4SLinus Torvalds /* 7621da177e4SLinus Torvalds * Insert a write request into an inode 7631da177e4SLinus Torvalds */ 7640c493b5cSTrond Myklebust static void nfs_inode_add_request(struct nfs_page *req) 7651da177e4SLinus Torvalds { 7660c493b5cSTrond Myklebust struct folio *folio = nfs_page_to_folio(req); 7677e8e78a0SChristoph Hellwig struct address_space *mapping = folio->mapping; 7680c493b5cSTrond Myklebust struct nfs_inode *nfsi = NFS_I(mapping->host); 769e7d39069STrond Myklebust 7702bfc6e56SWeston Andros Adamson WARN_ON_ONCE(req->wb_this_page != req); 7712bfc6e56SWeston Andros Adamson 772e7d39069STrond Myklebust /* Lock the request! */ 7737ad84aa9STrond Myklebust nfs_lock_request(req); 774600f111eSMatthew Wilcox (Oracle) spin_lock(&mapping->i_private_lock); 7752df485a7STrond Myklebust set_bit(PG_MAPPED, &req->wb_flags); 7760c493b5cSTrond Myklebust folio_set_private(folio); 7770c493b5cSTrond Myklebust folio->private = req; 778600f111eSMatthew Wilcox (Oracle) spin_unlock(&mapping->i_private_lock); 779a6b6d5b8STrond Myklebust atomic_long_inc(&nfsi->nrequests); 78017089a29SWeston Andros Adamson /* this a head request for a page group - mark it as having an 781cb1410c7SWeston Andros Adamson * extra reference so sub groups can follow suit. 782cb1410c7SWeston Andros Adamson * This flag also informs pgio layer when to bump nrequests when 783cb1410c7SWeston Andros Adamson * adding subrequests. */ 78417089a29SWeston Andros Adamson WARN_ON(test_and_set_bit(PG_INODE_REF, &req->wb_flags)); 785c03b4024STrond Myklebust kref_get(&req->wb_kref); 7861da177e4SLinus Torvalds } 7871da177e4SLinus Torvalds 7881da177e4SLinus Torvalds /* 78989a09141SPeter Zijlstra * Remove a write request from an inode 7901da177e4SLinus Torvalds */ 7911da177e4SLinus Torvalds static void nfs_inode_remove_request(struct nfs_page *req) 7921da177e4SLinus Torvalds { 7936a6d4644SScott Mayhew struct nfs_inode *nfsi = NFS_I(nfs_page_to_inode(req)); 7946a6d4644SScott Mayhew 79520633f04SWeston Andros Adamson if (nfs_page_group_sync_on_bit(req, PG_REMOVE)) { 7960c493b5cSTrond Myklebust struct folio *folio = nfs_page_to_folio(req->wb_head); 7977e8e78a0SChristoph Hellwig struct address_space *mapping = folio->mapping; 7981da177e4SLinus Torvalds 799600f111eSMatthew Wilcox (Oracle) spin_lock(&mapping->i_private_lock); 8007e8e78a0SChristoph Hellwig if (likely(folio)) { 8010c493b5cSTrond Myklebust folio->private = NULL; 8020c493b5cSTrond Myklebust folio_clear_private(folio); 8030c493b5cSTrond Myklebust clear_bit(PG_MAPPED, &req->wb_head->wb_flags); 80429418aa4SMel Gorman } 805600f111eSMatthew Wilcox (Oracle) spin_unlock(&mapping->i_private_lock); 80620633f04SWeston Andros Adamson } 80717089a29SWeston Andros Adamson 80833ea5aaaSZhangXiaoxu if (test_and_clear_bit(PG_INODE_REF, &req->wb_flags)) { 8096a6d4644SScott Mayhew atomic_long_dec(&nfsi->nrequests); 810dd1b2026SJeff Layton nfs_release_request(req); 81133ea5aaaSZhangXiaoxu } 8121da177e4SLinus Torvalds } 8131da177e4SLinus Torvalds 8140c493b5cSTrond Myklebust static void nfs_mark_request_dirty(struct nfs_page *req) 81561822ab5STrond Myklebust { 8160c493b5cSTrond Myklebust struct folio *folio = nfs_page_to_folio(req); 8170c493b5cSTrond Myklebust if (folio) 8180c493b5cSTrond Myklebust filemap_dirty_folio(folio_mapping(folio), folio); 81961822ab5STrond Myklebust } 82061822ab5STrond Myklebust 8218dd37758STrond Myklebust /** 82286d80f97STrond Myklebust * nfs_request_add_commit_list_locked - add request to a commit list 82386d80f97STrond Myklebust * @req: pointer to a struct nfs_page 82486d80f97STrond Myklebust * @dst: commit list head 82586d80f97STrond Myklebust * @cinfo: holds list lock and accounting info 82686d80f97STrond Myklebust * 82786d80f97STrond Myklebust * This sets the PG_CLEAN bit, updates the cinfo count of 82886d80f97STrond Myklebust * number of outstanding requests requiring a commit as well as 82986d80f97STrond Myklebust * the MM page stats. 83086d80f97STrond Myklebust * 831e824f99aSTrond Myklebust * The caller must hold NFS_I(cinfo->inode)->commit_mutex, and the 832e824f99aSTrond Myklebust * nfs_page lock. 83386d80f97STrond Myklebust */ 83486d80f97STrond Myklebust void 83586d80f97STrond Myklebust nfs_request_add_commit_list_locked(struct nfs_page *req, struct list_head *dst, 83686d80f97STrond Myklebust struct nfs_commit_info *cinfo) 83786d80f97STrond Myklebust { 83886d80f97STrond Myklebust set_bit(PG_CLEAN, &req->wb_flags); 83986d80f97STrond Myklebust nfs_list_add_request(req, dst); 8405cb953d4STrond Myklebust atomic_long_inc(&cinfo->mds->ncommit); 84186d80f97STrond Myklebust } 84286d80f97STrond Myklebust EXPORT_SYMBOL_GPL(nfs_request_add_commit_list_locked); 84386d80f97STrond Myklebust 84486d80f97STrond Myklebust /** 8458dd37758STrond Myklebust * nfs_request_add_commit_list - add request to a commit list 8468dd37758STrond Myklebust * @req: pointer to a struct nfs_page 847ea2cf228SFred Isaman * @cinfo: holds list lock and accounting info 8488dd37758STrond Myklebust * 849ea2cf228SFred Isaman * This sets the PG_CLEAN bit, updates the cinfo count of 8508dd37758STrond Myklebust * number of outstanding requests requiring a commit as well as 8518dd37758STrond Myklebust * the MM page stats. 8528dd37758STrond Myklebust * 853ea2cf228SFred Isaman * The caller must _not_ hold the cinfo->lock, but must be 8548dd37758STrond Myklebust * holding the nfs_page lock. 8558dd37758STrond Myklebust */ 8568dd37758STrond Myklebust void 8576272dcc6SAnna Schumaker nfs_request_add_commit_list(struct nfs_page *req, struct nfs_commit_info *cinfo) 8588dd37758STrond Myklebust { 859e824f99aSTrond Myklebust mutex_lock(&NFS_I(cinfo->inode)->commit_mutex); 8606272dcc6SAnna Schumaker nfs_request_add_commit_list_locked(req, &cinfo->mds->list, cinfo); 861e824f99aSTrond Myklebust mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex); 8620c493b5cSTrond Myklebust nfs_folio_mark_unstable(nfs_page_to_folio(req), cinfo); 8638dd37758STrond Myklebust } 8648dd37758STrond Myklebust EXPORT_SYMBOL_GPL(nfs_request_add_commit_list); 8658dd37758STrond Myklebust 8668dd37758STrond Myklebust /** 8678dd37758STrond Myklebust * nfs_request_remove_commit_list - Remove request from a commit list 8688dd37758STrond Myklebust * @req: pointer to a nfs_page 869ea2cf228SFred Isaman * @cinfo: holds list lock and accounting info 8708dd37758STrond Myklebust * 871ea2cf228SFred Isaman * This clears the PG_CLEAN bit, and updates the cinfo's count of 8728dd37758STrond Myklebust * number of outstanding requests requiring a commit 8738dd37758STrond Myklebust * It does not update the MM page stats. 8748dd37758STrond Myklebust * 875ea2cf228SFred Isaman * The caller _must_ hold the cinfo->lock and the nfs_page lock. 8768dd37758STrond Myklebust */ 8778dd37758STrond Myklebust void 878ea2cf228SFred Isaman nfs_request_remove_commit_list(struct nfs_page *req, 879ea2cf228SFred Isaman struct nfs_commit_info *cinfo) 8808dd37758STrond Myklebust { 8818dd37758STrond Myklebust if (!test_and_clear_bit(PG_CLEAN, &(req)->wb_flags)) 8828dd37758STrond Myklebust return; 8838dd37758STrond Myklebust nfs_list_remove_request(req); 8845cb953d4STrond Myklebust atomic_long_dec(&cinfo->mds->ncommit); 8858dd37758STrond Myklebust } 8868dd37758STrond Myklebust EXPORT_SYMBOL_GPL(nfs_request_remove_commit_list); 8878dd37758STrond Myklebust 888ea2cf228SFred Isaman static void nfs_init_cinfo_from_inode(struct nfs_commit_info *cinfo, 889ea2cf228SFred Isaman struct inode *inode) 890ea2cf228SFred Isaman { 891fe238e60SDave Wysochanski cinfo->inode = inode; 892ea2cf228SFred Isaman cinfo->mds = &NFS_I(inode)->commit_info; 893ea2cf228SFred Isaman cinfo->ds = pnfs_get_ds_info(inode); 894b359f9d0SFred Isaman cinfo->dreq = NULL; 895f453a54aSFred Isaman cinfo->completion_ops = &nfs_commit_completion_ops; 896ea2cf228SFred Isaman } 897ea2cf228SFred Isaman 898ea2cf228SFred Isaman void nfs_init_cinfo(struct nfs_commit_info *cinfo, 899ea2cf228SFred Isaman struct inode *inode, 900ea2cf228SFred Isaman struct nfs_direct_req *dreq) 901ea2cf228SFred Isaman { 9021763da12SFred Isaman if (dreq) 9031763da12SFred Isaman nfs_init_cinfo_from_dreq(cinfo, dreq); 9041763da12SFred Isaman else 905ea2cf228SFred Isaman nfs_init_cinfo_from_inode(cinfo, inode); 906ea2cf228SFred Isaman } 907ea2cf228SFred Isaman EXPORT_SYMBOL_GPL(nfs_init_cinfo); 9088dd37758STrond Myklebust 9091da177e4SLinus Torvalds /* 9101da177e4SLinus Torvalds * Add a request to the inode's commit list. 9111da177e4SLinus Torvalds */ 9121763da12SFred Isaman void 913ea2cf228SFred Isaman nfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg, 914b57ff130SWeston Andros Adamson struct nfs_commit_info *cinfo, u32 ds_commit_idx) 9151da177e4SLinus Torvalds { 916b57ff130SWeston Andros Adamson if (pnfs_mark_request_commit(req, lseg, cinfo, ds_commit_idx)) 9178dd37758STrond Myklebust return; 9186272dcc6SAnna Schumaker nfs_request_add_commit_list(req, cinfo); 9191da177e4SLinus Torvalds } 9208e821cadSTrond Myklebust 9210c493b5cSTrond Myklebust static void nfs_folio_clear_commit(struct folio *folio) 922e468bae9STrond Myklebust { 9230c493b5cSTrond Myklebust if (folio) { 9240c493b5cSTrond Myklebust long nr = folio_nr_pages(folio); 9250c493b5cSTrond Myklebust 9260c493b5cSTrond Myklebust node_stat_mod_folio(folio, NR_WRITEBACK, -nr); 9277e8e78a0SChristoph Hellwig wb_stat_mod(&inode_to_bdi(folio->mapping->host)->wb, 9280c493b5cSTrond Myklebust WB_WRITEBACK, -nr); 9290c493b5cSTrond Myklebust } 930e468bae9STrond Myklebust } 931d6d6dc7cSFred Isaman 932b5bab9bfSTrond Myklebust /* Called holding the request lock on @req */ 933b193a78dSTrond Myklebust static void nfs_clear_request_commit(struct nfs_commit_info *cinfo, 934b193a78dSTrond Myklebust struct nfs_page *req) 935d6d6dc7cSFred Isaman { 9368dd37758STrond Myklebust if (test_bit(PG_CLEAN, &req->wb_flags)) { 9379fcd5960STrond Myklebust struct nfs_open_context *ctx = nfs_req_openctx(req); 9389fcd5960STrond Myklebust struct inode *inode = d_inode(ctx->dentry); 939d6d6dc7cSFred Isaman 940e824f99aSTrond Myklebust mutex_lock(&NFS_I(inode)->commit_mutex); 941b193a78dSTrond Myklebust if (!pnfs_clear_request_commit(req, cinfo)) { 942b193a78dSTrond Myklebust nfs_request_remove_commit_list(req, cinfo); 943d6d6dc7cSFred Isaman } 944e824f99aSTrond Myklebust mutex_unlock(&NFS_I(inode)->commit_mutex); 9450c493b5cSTrond Myklebust nfs_folio_clear_commit(nfs_page_to_folio(req)); 9468dd37758STrond Myklebust } 947e468bae9STrond Myklebust } 948e468bae9STrond Myklebust 949d45f60c6SWeston Andros Adamson int nfs_write_need_commit(struct nfs_pgio_header *hdr) 9508e821cadSTrond Myklebust { 951c65e6254SWeston Andros Adamson if (hdr->verf.committed == NFS_DATA_SYNC) 952d45f60c6SWeston Andros Adamson return hdr->lseg == NULL; 953c65e6254SWeston Andros Adamson return hdr->verf.committed != NFS_FILE_SYNC; 9548e821cadSTrond Myklebust } 9558e821cadSTrond Myklebust 956919e3bd9STrond Myklebust static void nfs_async_write_init(struct nfs_pgio_header *hdr) 957919e3bd9STrond Myklebust { 958919e3bd9STrond Myklebust nfs_io_completion_get(hdr->io_completion); 959919e3bd9STrond Myklebust } 960919e3bd9STrond Myklebust 961061ae2edSFred Isaman static void nfs_write_completion(struct nfs_pgio_header *hdr) 9626c75dc0dSFred Isaman { 963ea2cf228SFred Isaman struct nfs_commit_info cinfo; 9646c75dc0dSFred Isaman unsigned long bytes = 0; 9656c75dc0dSFred Isaman 9666c75dc0dSFred Isaman if (test_bit(NFS_IOHDR_REDO, &hdr->flags)) 9676c75dc0dSFred Isaman goto out; 968ea2cf228SFred Isaman nfs_init_cinfo_from_inode(&cinfo, hdr->inode); 9696c75dc0dSFred Isaman while (!list_empty(&hdr->pages)) { 9706c75dc0dSFred Isaman struct nfs_page *req = nfs_list_entry(hdr->pages.next); 9716c75dc0dSFred Isaman 9726c75dc0dSFred Isaman bytes += req->wb_bytes; 9736c75dc0dSFred Isaman nfs_list_remove_request(req); 9746c75dc0dSFred Isaman if (test_bit(NFS_IOHDR_ERROR, &hdr->flags) && 9756c75dc0dSFred Isaman (hdr->good_bytes < bytes)) { 976af887e43STrond Myklebust trace_nfs_comp_error(hdr->inode, req, hdr->error); 9770c493b5cSTrond Myklebust nfs_mapping_set_error(nfs_page_to_folio(req), 9780c493b5cSTrond Myklebust hdr->error); 9796c75dc0dSFred Isaman goto remove_req; 9806c75dc0dSFred Isaman } 981c65e6254SWeston Andros Adamson if (nfs_write_need_commit(hdr)) { 98233344e0fSTrond Myklebust /* Reset wb_nio, since the write was successful. */ 98333344e0fSTrond Myklebust req->wb_nio = 0; 984f79d06f5SAnna Schumaker memcpy(&req->wb_verf, &hdr->verf.verifier, sizeof(req->wb_verf)); 985b57ff130SWeston Andros Adamson nfs_mark_request_commit(req, hdr->lseg, &cinfo, 986a7d42ddbSWeston Andros Adamson hdr->pgio_mirror_idx); 9876c75dc0dSFred Isaman goto next; 9886c75dc0dSFred Isaman } 9896c75dc0dSFred Isaman remove_req: 9906c75dc0dSFred Isaman nfs_inode_remove_request(req); 9916c75dc0dSFred Isaman next: 9920c493b5cSTrond Myklebust nfs_page_end_writeback(req); 9933aff4ebbSTrond Myklebust nfs_release_request(req); 9946c75dc0dSFred Isaman } 9956c75dc0dSFred Isaman out: 996919e3bd9STrond Myklebust nfs_io_completion_put(hdr->io_completion); 9976c75dc0dSFred Isaman hdr->release(hdr); 9986c75dc0dSFred Isaman } 9996c75dc0dSFred Isaman 1000ce59515cSAnna Schumaker unsigned long 1001ea2cf228SFred Isaman nfs_reqs_to_commit(struct nfs_commit_info *cinfo) 1002fb8a1f11STrond Myklebust { 10035cb953d4STrond Myklebust return atomic_long_read(&cinfo->mds->ncommit); 1004fb8a1f11STrond Myklebust } 1005fb8a1f11STrond Myklebust 1006e824f99aSTrond Myklebust /* NFS_I(cinfo->inode)->commit_mutex held by caller */ 10071763da12SFred Isaman int 1008ea2cf228SFred Isaman nfs_scan_commit_list(struct list_head *src, struct list_head *dst, 1009ea2cf228SFred Isaman struct nfs_commit_info *cinfo, int max) 1010d6d6dc7cSFred Isaman { 1011137da553STrond Myklebust struct nfs_page *req, *tmp; 1012d6d6dc7cSFred Isaman int ret = 0; 1013d6d6dc7cSFred Isaman 1014137da553STrond Myklebust list_for_each_entry_safe(req, tmp, src, wb_list) { 10157ad84aa9STrond Myklebust kref_get(&req->wb_kref); 10162ce209c4STrond Myklebust if (!nfs_lock_request(req)) { 1017137da553STrond Myklebust nfs_release_request(req); 1018137da553STrond Myklebust continue; 1019137da553STrond Myklebust } 1020ea2cf228SFred Isaman nfs_request_remove_commit_list(req, cinfo); 10215d2a9d9dSTrond Myklebust clear_bit(PG_COMMIT_TO_DS, &req->wb_flags); 10228dd37758STrond Myklebust nfs_list_add_request(req, dst); 1023d6d6dc7cSFred Isaman ret++; 10241763da12SFred Isaman if ((ret == max) && !cinfo->dreq) 1025d6d6dc7cSFred Isaman break; 1026e824f99aSTrond Myklebust cond_resched(); 1027d6d6dc7cSFred Isaman } 1028d6d6dc7cSFred Isaman return ret; 1029d6d6dc7cSFred Isaman } 10305d2a9d9dSTrond Myklebust EXPORT_SYMBOL_GPL(nfs_scan_commit_list); 1031d6d6dc7cSFred Isaman 10321da177e4SLinus Torvalds /* 10331da177e4SLinus Torvalds * nfs_scan_commit - Scan an inode for commit requests 10341da177e4SLinus Torvalds * @inode: NFS inode to scan 1035ea2cf228SFred Isaman * @dst: mds destination list 1036ea2cf228SFred Isaman * @cinfo: mds and ds lists of reqs ready to commit 10371da177e4SLinus Torvalds * 10381da177e4SLinus Torvalds * Moves requests from the inode's 'commit' request list. 10391da177e4SLinus Torvalds * The requests are *not* checked to ensure that they form a contiguous set. 10401da177e4SLinus Torvalds */ 10411763da12SFred Isaman int 1042ea2cf228SFred Isaman nfs_scan_commit(struct inode *inode, struct list_head *dst, 1043ea2cf228SFred Isaman struct nfs_commit_info *cinfo) 10441da177e4SLinus Torvalds { 1045d6d6dc7cSFred Isaman int ret = 0; 1046fb8a1f11STrond Myklebust 10475cb953d4STrond Myklebust if (!atomic_long_read(&cinfo->mds->ncommit)) 10485cb953d4STrond Myklebust return 0; 1049e824f99aSTrond Myklebust mutex_lock(&NFS_I(cinfo->inode)->commit_mutex); 10505cb953d4STrond Myklebust if (atomic_long_read(&cinfo->mds->ncommit) > 0) { 10518dd37758STrond Myklebust const int max = INT_MAX; 1052d6d6dc7cSFred Isaman 1053ea2cf228SFred Isaman ret = nfs_scan_commit_list(&cinfo->mds->list, dst, 1054ea2cf228SFred Isaman cinfo, max); 1055ea2cf228SFred Isaman ret += pnfs_scan_commit_lists(inode, cinfo, max - ret); 1056d6d6dc7cSFred Isaman } 1057e824f99aSTrond Myklebust mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex); 1058ff778d02STrond Myklebust return ret; 10591da177e4SLinus Torvalds } 1060d6d6dc7cSFred Isaman 10611da177e4SLinus Torvalds /* 1062e7d39069STrond Myklebust * Search for an existing write request, and attempt to update 1063e7d39069STrond Myklebust * it to reflect a new dirty region on a given page. 10641da177e4SLinus Torvalds * 1065e7d39069STrond Myklebust * If the attempt fails, then the existing request is flushed out 1066e7d39069STrond Myklebust * to disk. 10671da177e4SLinus Torvalds */ 10680c493b5cSTrond Myklebust static struct nfs_page *nfs_try_to_update_request(struct folio *folio, 1069e7d39069STrond Myklebust unsigned int offset, 1070e7d39069STrond Myklebust unsigned int bytes) 10711da177e4SLinus Torvalds { 1072e7d39069STrond Myklebust struct nfs_page *req; 1073e7d39069STrond Myklebust unsigned int rqend; 1074e7d39069STrond Myklebust unsigned int end; 10751da177e4SLinus Torvalds int error; 1076277459d2STrond Myklebust 1077e7d39069STrond Myklebust end = offset + bytes; 1078e7d39069STrond Myklebust 10790c493b5cSTrond Myklebust req = nfs_lock_and_join_requests(folio); 1080f6032f21STrond Myklebust if (IS_ERR_OR_NULL(req)) 1081f6032f21STrond Myklebust return req; 10822bfc6e56SWeston Andros Adamson 1083e7d39069STrond Myklebust rqend = req->wb_offset + req->wb_bytes; 1084e7d39069STrond Myklebust /* 1085e7d39069STrond Myklebust * Tell the caller to flush out the request if 1086e7d39069STrond Myklebust * the offsets are non-contiguous. 1087e7d39069STrond Myklebust * Note: nfs_flush_incompatible() will already 1088e7d39069STrond Myklebust * have flushed out requests having wrong owners. 1089e7d39069STrond Myklebust */ 1090f6032f21STrond Myklebust if (offset > rqend || end < req->wb_offset) 1091e7d39069STrond Myklebust goto out_flushme; 1092e7d39069STrond Myklebust 10931da177e4SLinus Torvalds /* Okay, the request matches. Update the region */ 10941da177e4SLinus Torvalds if (offset < req->wb_offset) { 10951da177e4SLinus Torvalds req->wb_offset = offset; 10961da177e4SLinus Torvalds req->wb_pgbase = offset; 10971da177e4SLinus Torvalds } 10981da177e4SLinus Torvalds if (end > rqend) 10991da177e4SLinus Torvalds req->wb_bytes = end - req->wb_offset; 1100e7d39069STrond Myklebust else 1101e7d39069STrond Myklebust req->wb_bytes = rqend - req->wb_offset; 110233344e0fSTrond Myklebust req->wb_nio = 0; 1103e7d39069STrond Myklebust return req; 1104e7d39069STrond Myklebust out_flushme: 1105f6032f21STrond Myklebust /* 1106f6032f21STrond Myklebust * Note: we mark the request dirty here because 1107f6032f21STrond Myklebust * nfs_lock_and_join_requests() cannot preserve 1108f6032f21STrond Myklebust * commit flags, so we have to replay the write. 1109f6032f21STrond Myklebust */ 1110f6032f21STrond Myklebust nfs_mark_request_dirty(req); 1111f6032f21STrond Myklebust nfs_unlock_and_release_request(req); 11127e8e78a0SChristoph Hellwig error = nfs_wb_folio(folio->mapping->host, folio); 1113f6032f21STrond Myklebust return (error < 0) ? ERR_PTR(error) : NULL; 1114e7d39069STrond Myklebust } 11151da177e4SLinus Torvalds 1116e7d39069STrond Myklebust /* 1117e7d39069STrond Myklebust * Try to update an existing write request, or create one if there is none. 1118e7d39069STrond Myklebust * 1119e7d39069STrond Myklebust * Note: Should always be called with the Page Lock held to prevent races 1120e7d39069STrond Myklebust * if we have to add a new request. Also assumes that the caller has 1121e7d39069STrond Myklebust * already called nfs_flush_incompatible() if necessary. 1122e7d39069STrond Myklebust */ 1123e7d39069STrond Myklebust static struct nfs_page *nfs_setup_write_request(struct nfs_open_context *ctx, 11240c493b5cSTrond Myklebust struct folio *folio, 11250c493b5cSTrond Myklebust unsigned int offset, 11260c493b5cSTrond Myklebust unsigned int bytes) 1127e7d39069STrond Myklebust { 1128e7d39069STrond Myklebust struct nfs_page *req; 1129e7d39069STrond Myklebust 11300c493b5cSTrond Myklebust req = nfs_try_to_update_request(folio, offset, bytes); 1131e7d39069STrond Myklebust if (req != NULL) 1132e7d39069STrond Myklebust goto out; 11330c493b5cSTrond Myklebust req = nfs_page_create_from_folio(ctx, folio, offset, bytes); 1134e7d39069STrond Myklebust if (IS_ERR(req)) 1135e7d39069STrond Myklebust goto out; 11360c493b5cSTrond Myklebust nfs_inode_add_request(req); 1137efc91ed0STrond Myklebust out: 113861e930a9STrond Myklebust return req; 11391da177e4SLinus Torvalds } 11401da177e4SLinus Torvalds 11410c493b5cSTrond Myklebust static int nfs_writepage_setup(struct nfs_open_context *ctx, 11420c493b5cSTrond Myklebust struct folio *folio, unsigned int offset, 11430c493b5cSTrond Myklebust unsigned int count) 1144e7d39069STrond Myklebust { 1145e7d39069STrond Myklebust struct nfs_page *req; 1146e7d39069STrond Myklebust 11470c493b5cSTrond Myklebust req = nfs_setup_write_request(ctx, folio, offset, count); 1148e7d39069STrond Myklebust if (IS_ERR(req)) 1149e7d39069STrond Myklebust return PTR_ERR(req); 1150e7d39069STrond Myklebust /* Update file length */ 11510c493b5cSTrond Myklebust nfs_grow_file(folio, offset, count); 1152d72ddcbaSWeston Andros Adamson nfs_mark_uptodate(req); 1153a6305ddbSTrond Myklebust nfs_mark_request_dirty(req); 11541d1afcbcSTrond Myklebust nfs_unlock_and_release_request(req); 1155e7d39069STrond Myklebust return 0; 1156e7d39069STrond Myklebust } 1157e7d39069STrond Myklebust 11580c493b5cSTrond Myklebust int nfs_flush_incompatible(struct file *file, struct folio *folio) 11591da177e4SLinus Torvalds { 1160cd3758e3STrond Myklebust struct nfs_open_context *ctx = nfs_file_open_context(file); 11612a369153STrond Myklebust struct nfs_lock_context *l_ctx; 116217b985deSJeff Layton struct file_lock_context *flctx = locks_inode_context(file_inode(file)); 11631da177e4SLinus Torvalds struct nfs_page *req; 11641a54533eSTrond Myklebust int do_flush, status; 11651da177e4SLinus Torvalds /* 11661da177e4SLinus Torvalds * Look for a request corresponding to this page. If there 11671da177e4SLinus Torvalds * is one, and it belongs to another file, we flush it out 11681da177e4SLinus Torvalds * before we try to copy anything into the page. Do this 11691da177e4SLinus Torvalds * due to the lack of an ACCESS-type call in NFSv2. 11701da177e4SLinus Torvalds * Also do the same if we find a request from an existing 11711da177e4SLinus Torvalds * dropped page. 11721da177e4SLinus Torvalds */ 11731a54533eSTrond Myklebust do { 11740c493b5cSTrond Myklebust req = nfs_folio_find_head_request(folio); 11751a54533eSTrond Myklebust if (req == NULL) 11761a54533eSTrond Myklebust return 0; 11772a369153STrond Myklebust l_ctx = req->wb_lock_context; 11780c493b5cSTrond Myklebust do_flush = nfs_page_to_folio(req) != folio || 11799fcd5960STrond Myklebust !nfs_match_open_context(nfs_req_openctx(req), ctx); 1180bd61e0a9SJeff Layton if (l_ctx && flctx && 1181bd61e0a9SJeff Layton !(list_empty_careful(&flctx->flc_posix) && 1182bd61e0a9SJeff Layton list_empty_careful(&flctx->flc_flock))) { 1183d51fdb87SNeilBrown do_flush |= l_ctx->lockowner != current->files; 11845263e31eSJeff Layton } 11851da177e4SLinus Torvalds nfs_release_request(req); 11861a54533eSTrond Myklebust if (!do_flush) 11871a54533eSTrond Myklebust return 0; 11887e8e78a0SChristoph Hellwig status = nfs_wb_folio(folio->mapping->host, folio); 11891a54533eSTrond Myklebust } while (status == 0); 11901a54533eSTrond Myklebust return status; 11911da177e4SLinus Torvalds } 11921da177e4SLinus Torvalds 11931da177e4SLinus Torvalds /* 1194dc24826bSAndy Adamson * Avoid buffered writes when a open context credential's key would 1195dc24826bSAndy Adamson * expire soon. 1196dc24826bSAndy Adamson * 1197dc24826bSAndy Adamson * Returns -EACCES if the key will expire within RPC_KEY_EXPIRE_FAIL. 1198dc24826bSAndy Adamson * 1199dc24826bSAndy Adamson * Return 0 and set a credential flag which triggers the inode to flush 1200dc24826bSAndy Adamson * and performs NFS_FILE_SYNC writes if the key will expired within 1201dc24826bSAndy Adamson * RPC_KEY_EXPIRE_TIMEO. 1202dc24826bSAndy Adamson */ 1203dc24826bSAndy Adamson int 1204dc24826bSAndy Adamson nfs_key_timeout_notify(struct file *filp, struct inode *inode) 1205dc24826bSAndy Adamson { 1206dc24826bSAndy Adamson struct nfs_open_context *ctx = nfs_file_open_context(filp); 1207dc24826bSAndy Adamson 1208ddf529eeSNeilBrown if (nfs_ctx_key_to_expire(ctx, inode) && 1209ca05cbaeSTrond Myklebust !rcu_access_pointer(ctx->ll_cred)) 1210ddf529eeSNeilBrown /* Already expired! */ 1211ddf529eeSNeilBrown return -EACCES; 1212ddf529eeSNeilBrown return 0; 1213dc24826bSAndy Adamson } 1214dc24826bSAndy Adamson 1215dc24826bSAndy Adamson /* 1216dc24826bSAndy Adamson * Test if the open context credential key is marked to expire soon. 1217dc24826bSAndy Adamson */ 1218ce52914eSScott Mayhew bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx, struct inode *inode) 1219dc24826bSAndy Adamson { 1220ce52914eSScott Mayhew struct rpc_auth *auth = NFS_SERVER(inode)->client->cl_auth; 1221ca05cbaeSTrond Myklebust struct rpc_cred *cred, *new, *old = NULL; 1222ddf529eeSNeilBrown struct auth_cred acred = { 1223a52458b4SNeilBrown .cred = ctx->cred, 1224ddf529eeSNeilBrown }; 1225ca05cbaeSTrond Myklebust bool ret = false; 1226ce52914eSScott Mayhew 1227ca05cbaeSTrond Myklebust rcu_read_lock(); 1228ca05cbaeSTrond Myklebust cred = rcu_dereference(ctx->ll_cred); 1229ca05cbaeSTrond Myklebust if (cred && !(cred->cr_ops->crkey_timeout && 1230ca05cbaeSTrond Myklebust cred->cr_ops->crkey_timeout(cred))) 1231ca05cbaeSTrond Myklebust goto out; 1232ca05cbaeSTrond Myklebust rcu_read_unlock(); 1233ca05cbaeSTrond Myklebust 1234ca05cbaeSTrond Myklebust new = auth->au_ops->lookup_cred(auth, &acred, 0); 1235ca05cbaeSTrond Myklebust if (new == cred) { 1236ca05cbaeSTrond Myklebust put_rpccred(new); 1237ddf529eeSNeilBrown return true; 1238ca05cbaeSTrond Myklebust } 1239ca05cbaeSTrond Myklebust if (IS_ERR_OR_NULL(new)) { 1240ca05cbaeSTrond Myklebust new = NULL; 1241ca05cbaeSTrond Myklebust ret = true; 1242ca05cbaeSTrond Myklebust } else if (new->cr_ops->crkey_timeout && 1243ca05cbaeSTrond Myklebust new->cr_ops->crkey_timeout(new)) 1244ca05cbaeSTrond Myklebust ret = true; 1245ca05cbaeSTrond Myklebust 1246ca05cbaeSTrond Myklebust rcu_read_lock(); 1247ca05cbaeSTrond Myklebust old = rcu_dereference_protected(xchg(&ctx->ll_cred, 1248ca05cbaeSTrond Myklebust RCU_INITIALIZER(new)), 1); 1249ca05cbaeSTrond Myklebust out: 1250ca05cbaeSTrond Myklebust rcu_read_unlock(); 1251ca05cbaeSTrond Myklebust put_rpccred(old); 1252ca05cbaeSTrond Myklebust return ret; 1253dc24826bSAndy Adamson } 1254dc24826bSAndy Adamson 1255dc24826bSAndy Adamson /* 12565d47a356STrond Myklebust * If the page cache is marked as unsafe or invalid, then we can't rely on 12575d47a356STrond Myklebust * the PageUptodate() flag. In this case, we will need to turn off 12585d47a356STrond Myklebust * write optimisations that depend on the page contents being correct. 12595d47a356STrond Myklebust */ 12600c493b5cSTrond Myklebust static bool nfs_folio_write_uptodate(struct folio *folio, unsigned int pagelen) 12615d47a356STrond Myklebust { 12627e8e78a0SChristoph Hellwig struct inode *inode = folio->mapping->host; 1263d529ef83SJeff Layton struct nfs_inode *nfsi = NFS_I(inode); 1264d529ef83SJeff Layton 12658d197a56STrond Myklebust if (nfs_have_delegated_attributes(inode)) 12668d197a56STrond Myklebust goto out; 1267fc9dc401STrond Myklebust if (nfsi->cache_validity & 126813c0b082STrond Myklebust (NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_SIZE)) 1269d529ef83SJeff Layton return false; 12704db72b40SJeff Layton smp_rmb(); 1271fc9dc401STrond Myklebust if (test_bit(NFS_INO_INVALIDATING, &nfsi->flags) && pagelen != 0) 12728d197a56STrond Myklebust return false; 12738d197a56STrond Myklebust out: 1274fc9dc401STrond Myklebust if (nfsi->cache_validity & NFS_INO_INVALID_DATA && pagelen != 0) 127518dd78c4SScott Mayhew return false; 12760c493b5cSTrond Myklebust return folio_test_uptodate(folio) != 0; 12775d47a356STrond Myklebust } 12785d47a356STrond Myklebust 12795263e31eSJeff Layton static bool 12805263e31eSJeff Layton is_whole_file_wrlock(struct file_lock *fl) 12815263e31eSJeff Layton { 12825263e31eSJeff Layton return fl->fl_start == 0 && fl->fl_end == OFFSET_MAX && 1283d7c9616bSJeff Layton lock_is_write(fl); 12845263e31eSJeff Layton } 12855263e31eSJeff Layton 1286c7559663SScott Mayhew /* If we know the page is up to date, and we're not using byte range locks (or 1287c7559663SScott Mayhew * if we have the whole file locked for writing), it may be more efficient to 1288c7559663SScott Mayhew * extend the write to cover the entire page in order to avoid fragmentation 1289c7559663SScott Mayhew * inefficiencies. 1290c7559663SScott Mayhew * 1291263b4509SScott Mayhew * If the file is opened for synchronous writes then we can just skip the rest 1292263b4509SScott Mayhew * of the checks. 1293c7559663SScott Mayhew */ 12940c493b5cSTrond Myklebust static int nfs_can_extend_write(struct file *file, struct folio *folio, 12950c493b5cSTrond Myklebust unsigned int pagelen) 1296c7559663SScott Mayhew { 12970c493b5cSTrond Myklebust struct inode *inode = file_inode(file); 129817b985deSJeff Layton struct file_lock_context *flctx = locks_inode_context(inode); 12995263e31eSJeff Layton struct file_lock *fl; 13000c493b5cSTrond Myklebust int ret; 13015263e31eSJeff Layton 1302c7559663SScott Mayhew if (file->f_flags & O_DSYNC) 1303c7559663SScott Mayhew return 0; 13040c493b5cSTrond Myklebust if (!nfs_folio_write_uptodate(folio, pagelen)) 1305263b4509SScott Mayhew return 0; 13064201916fSTrond Myklebust if (nfs_have_write_delegation(inode)) 1307c7559663SScott Mayhew return 1; 1308bd61e0a9SJeff Layton if (!flctx || (list_empty_careful(&flctx->flc_flock) && 1309bd61e0a9SJeff Layton list_empty_careful(&flctx->flc_posix))) 13108fa4592aSTrond Myklebust return 1; 13115263e31eSJeff Layton 13125263e31eSJeff Layton /* Check to see if there are whole file write locks */ 13135263e31eSJeff Layton ret = 0; 13146109c850SJeff Layton spin_lock(&flctx->flc_lock); 1315bd61e0a9SJeff Layton if (!list_empty(&flctx->flc_posix)) { 1316bd61e0a9SJeff Layton fl = list_first_entry(&flctx->flc_posix, struct file_lock, 1317dd1fac6aSJeff Layton c.flc_list); 1318bd61e0a9SJeff Layton if (is_whole_file_wrlock(fl)) 13195263e31eSJeff Layton ret = 1; 1320bd61e0a9SJeff Layton } else if (!list_empty(&flctx->flc_flock)) { 13215263e31eSJeff Layton fl = list_first_entry(&flctx->flc_flock, struct file_lock, 1322dd1fac6aSJeff Layton c.flc_list); 1323d7c9616bSJeff Layton if (lock_is_write(fl)) 13245263e31eSJeff Layton ret = 1; 13255263e31eSJeff Layton } 13266109c850SJeff Layton spin_unlock(&flctx->flc_lock); 13275263e31eSJeff Layton return ret; 1328c7559663SScott Mayhew } 1329c7559663SScott Mayhew 13305d47a356STrond Myklebust /* 13311da177e4SLinus Torvalds * Update and possibly write a cached page of an NFS file. 13321da177e4SLinus Torvalds * 13331da177e4SLinus Torvalds * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad 13341da177e4SLinus Torvalds * things with a page scheduled for an RPC call (e.g. invalidate it). 13351da177e4SLinus Torvalds */ 13360c493b5cSTrond Myklebust int nfs_update_folio(struct file *file, struct folio *folio, 13371da177e4SLinus Torvalds unsigned int offset, unsigned int count) 13381da177e4SLinus Torvalds { 1339cd3758e3STrond Myklebust struct nfs_open_context *ctx = nfs_file_open_context(file); 13407e8e78a0SChristoph Hellwig struct address_space *mapping = folio->mapping; 1341d2ceb7e5SBenjamin Coddington struct inode *inode = mapping->host; 13420c493b5cSTrond Myklebust unsigned int pagelen = nfs_folio_length(folio); 13431da177e4SLinus Torvalds int status = 0; 13441da177e4SLinus Torvalds 134591d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE); 134691d5b470SChuck Lever 13470c493b5cSTrond Myklebust dprintk("NFS: nfs_update_folio(%pD2 %d@%lld)\n", file, count, 13480c493b5cSTrond Myklebust (long long)(folio_file_pos(folio) + offset)); 13491da177e4SLinus Torvalds 1350149a4fddSBenjamin Coddington if (!count) 1351149a4fddSBenjamin Coddington goto out; 1352149a4fddSBenjamin Coddington 13530c493b5cSTrond Myklebust if (nfs_can_extend_write(file, folio, pagelen)) { 1354fc9dc401STrond Myklebust count = max(count + offset, pagelen); 13551da177e4SLinus Torvalds offset = 0; 13561da177e4SLinus Torvalds } 13571da177e4SLinus Torvalds 13580c493b5cSTrond Myklebust status = nfs_writepage_setup(ctx, folio, offset, count); 135903fa9e84STrond Myklebust if (status < 0) 1360d2ceb7e5SBenjamin Coddington nfs_set_pageerror(mapping); 1361149a4fddSBenjamin Coddington out: 13620c493b5cSTrond Myklebust dprintk("NFS: nfs_update_folio returns %d (isize %lld)\n", 13631da177e4SLinus Torvalds status, (long long)i_size_read(inode)); 13641da177e4SLinus Torvalds return status; 13651da177e4SLinus Torvalds } 13661da177e4SLinus Torvalds 13673ff7576dSTrond Myklebust static int flush_task_priority(int how) 13681da177e4SLinus Torvalds { 13691da177e4SLinus Torvalds switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) { 13701da177e4SLinus Torvalds case FLUSH_HIGHPRI: 13711da177e4SLinus Torvalds return RPC_PRIORITY_HIGH; 13721da177e4SLinus Torvalds case FLUSH_LOWPRI: 13731da177e4SLinus Torvalds return RPC_PRIORITY_LOW; 13741da177e4SLinus Torvalds } 13751da177e4SLinus Torvalds return RPC_PRIORITY_NORMAL; 13761da177e4SLinus Torvalds } 13771da177e4SLinus Torvalds 1378d45f60c6SWeston Andros Adamson static void nfs_initiate_write(struct nfs_pgio_header *hdr, 1379d45f60c6SWeston Andros Adamson struct rpc_message *msg, 1380abde71f4STom Haynes const struct nfs_rpc_ops *rpc_ops, 13811ed26f33SAnna Schumaker struct rpc_task_setup *task_setup_data, int how) 13821da177e4SLinus Torvalds { 13833ff7576dSTrond Myklebust int priority = flush_task_priority(how); 13841da177e4SLinus Torvalds 13858db55a03SNeilBrown if (IS_SWAPFILE(hdr->inode)) 13868db55a03SNeilBrown task_setup_data->flags |= RPC_TASK_SWAPPER; 13871ed26f33SAnna Schumaker task_setup_data->priority = priority; 1388fb91fb0eSAnna Schumaker rpc_ops->write_setup(hdr, msg, &task_setup_data->rpc_client); 13895bb2a7cbSTrond Myklebust trace_nfs_initiate_write(hdr); 1390275acaafSTrond Myklebust } 1391275acaafSTrond Myklebust 13926d884e8fSFred /* If a nfs_flush_* function fails, it should remove reqs from @head and 13936d884e8fSFred * call this on each, which will prepare them to be retried on next 13946d884e8fSFred * writeback using standard nfs. 13956d884e8fSFred */ 13966d884e8fSFred static void nfs_redirty_request(struct nfs_page *req) 13976d884e8fSFred { 13986dd85e83STrond Myklebust struct nfs_inode *nfsi = NFS_I(nfs_page_to_inode(req)); 139967f4b5dcSTrond Myklebust 140033344e0fSTrond Myklebust /* Bump the transmission count */ 140133344e0fSTrond Myklebust req->wb_nio++; 14026d884e8fSFred nfs_mark_request_dirty(req); 140367f4b5dcSTrond Myklebust atomic_long_inc(&nfsi->redirtied_pages); 14040c493b5cSTrond Myklebust nfs_page_end_writeback(req); 14053aff4ebbSTrond Myklebust nfs_release_request(req); 14066d884e8fSFred } 14076d884e8fSFred 1408df3accb8STrond Myklebust static void nfs_async_write_error(struct list_head *head, int error) 14096c75dc0dSFred Isaman { 14106c75dc0dSFred Isaman struct nfs_page *req; 14116c75dc0dSFred Isaman 14126c75dc0dSFred Isaman while (!list_empty(head)) { 14136c75dc0dSFred Isaman req = nfs_list_entry(head->next); 14146c75dc0dSFred Isaman nfs_list_remove_request(req); 1415cea9ba72STrond Myklebust if (nfs_error_is_fatal_on_server(error)) 14166fbda89bSTrond Myklebust nfs_write_error(req, error); 14176fbda89bSTrond Myklebust else 14186c75dc0dSFred Isaman nfs_redirty_request(req); 14196c75dc0dSFred Isaman } 14206c75dc0dSFred Isaman } 14216c75dc0dSFred Isaman 1422dc602dd7STrond Myklebust static void nfs_async_write_reschedule_io(struct nfs_pgio_header *hdr) 1423dc602dd7STrond Myklebust { 1424df3accb8STrond Myklebust nfs_async_write_error(&hdr->pages, 0); 1425dc602dd7STrond Myklebust } 1426dc602dd7STrond Myklebust 1427061ae2edSFred Isaman static const struct nfs_pgio_completion_ops nfs_async_write_completion_ops = { 1428919e3bd9STrond Myklebust .init_hdr = nfs_async_write_init, 1429061ae2edSFred Isaman .error_cleanup = nfs_async_write_error, 1430061ae2edSFred Isaman .completion = nfs_write_completion, 1431dc602dd7STrond Myklebust .reschedule_io = nfs_async_write_reschedule_io, 1432061ae2edSFred Isaman }; 1433061ae2edSFred Isaman 143457208fa7SBryan Schumaker void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, 1435a20c93e3SChristoph Hellwig struct inode *inode, int ioflags, bool force_mds, 1436061ae2edSFred Isaman const struct nfs_pgio_completion_ops *compl_ops) 14371751c363STrond Myklebust { 1438a20c93e3SChristoph Hellwig struct nfs_server *server = NFS_SERVER(inode); 143941d8d5b7SAnna Schumaker const struct nfs_pageio_ops *pg_ops = &nfs_pgio_rw_ops; 1440a20c93e3SChristoph Hellwig 1441a20c93e3SChristoph Hellwig #ifdef CONFIG_NFS_V4_1 1442a20c93e3SChristoph Hellwig if (server->pnfs_curr_ld && !force_mds) 1443a20c93e3SChristoph Hellwig pg_ops = server->pnfs_curr_ld->pg_write_ops; 1444a20c93e3SChristoph Hellwig #endif 14454a0de55cSAnna Schumaker nfs_pageio_init(pgio, inode, pg_ops, compl_ops, &nfs_rw_write_ops, 14463bde7afdSTrond Myklebust server->wsize, ioflags); 14471751c363STrond Myklebust } 1448ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_pageio_init_write); 14491751c363STrond Myklebust 1450dce81290STrond Myklebust void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio) 1451dce81290STrond Myklebust { 1452a7d42ddbSWeston Andros Adamson struct nfs_pgio_mirror *mirror; 1453a7d42ddbSWeston Andros Adamson 14546f29b9bbSKinglong Mee if (pgio->pg_ops && pgio->pg_ops->pg_cleanup) 14556f29b9bbSKinglong Mee pgio->pg_ops->pg_cleanup(pgio); 14566f29b9bbSKinglong Mee 145741d8d5b7SAnna Schumaker pgio->pg_ops = &nfs_pgio_rw_ops; 1458a7d42ddbSWeston Andros Adamson 1459a7d42ddbSWeston Andros Adamson nfs_pageio_stop_mirroring(pgio); 1460a7d42ddbSWeston Andros Adamson 1461a7d42ddbSWeston Andros Adamson mirror = &pgio->pg_mirrors[0]; 1462a7d42ddbSWeston Andros Adamson mirror->pg_bsize = NFS_SERVER(pgio->pg_inode)->wsize; 1463dce81290STrond Myklebust } 14641f945357STrond Myklebust EXPORT_SYMBOL_GPL(nfs_pageio_reset_write_mds); 1465dce81290STrond Myklebust 14661da177e4SLinus Torvalds 14670b7c0153SFred Isaman void nfs_commit_prepare(struct rpc_task *task, void *calldata) 14680b7c0153SFred Isaman { 14690b7c0153SFred Isaman struct nfs_commit_data *data = calldata; 14700b7c0153SFred Isaman 14710b7c0153SFred Isaman NFS_PROTO(data->inode)->commit_rpc_prepare(task, data); 14720b7c0153SFred Isaman } 14730b7c0153SFred Isaman 1474a08a8cd3STrond Myklebust static void nfs_writeback_check_extend(struct nfs_pgio_header *hdr, 1475a08a8cd3STrond Myklebust struct nfs_fattr *fattr) 1476a08a8cd3STrond Myklebust { 1477a08a8cd3STrond Myklebust struct nfs_pgio_args *argp = &hdr->args; 1478a08a8cd3STrond Myklebust struct nfs_pgio_res *resp = &hdr->res; 14792b83d3deSTrond Myklebust u64 size = argp->offset + resp->count; 1480a08a8cd3STrond Myklebust 1481a08a8cd3STrond Myklebust if (!(fattr->valid & NFS_ATTR_FATTR_SIZE)) 14822b83d3deSTrond Myklebust fattr->size = size; 14832b83d3deSTrond Myklebust if (nfs_size_to_loff_t(fattr->size) < i_size_read(hdr->inode)) { 14842b83d3deSTrond Myklebust fattr->valid &= ~NFS_ATTR_FATTR_SIZE; 1485a08a8cd3STrond Myklebust return; 14862b83d3deSTrond Myklebust } 14872b83d3deSTrond Myklebust if (size != fattr->size) 1488a08a8cd3STrond Myklebust return; 1489a08a8cd3STrond Myklebust /* Set attribute barrier */ 1490a08a8cd3STrond Myklebust nfs_fattr_set_barrier(fattr); 14912b83d3deSTrond Myklebust /* ...and update size */ 14922b83d3deSTrond Myklebust fattr->valid |= NFS_ATTR_FATTR_SIZE; 1493a08a8cd3STrond Myklebust } 1494a08a8cd3STrond Myklebust 1495a08a8cd3STrond Myklebust void nfs_writeback_update_inode(struct nfs_pgio_header *hdr) 1496a08a8cd3STrond Myklebust { 14972b83d3deSTrond Myklebust struct nfs_fattr *fattr = &hdr->fattr; 1498a08a8cd3STrond Myklebust struct inode *inode = hdr->inode; 1499a08a8cd3STrond Myklebust 1500e12912d9STrond Myklebust if (nfs_have_delegated_mtime(inode)) { 1501e12912d9STrond Myklebust spin_lock(&inode->i_lock); 1502e12912d9STrond Myklebust nfs_set_cache_invalid(inode, NFS_INO_INVALID_BLOCKS); 1503e12912d9STrond Myklebust spin_unlock(&inode->i_lock); 1504e12912d9STrond Myklebust return; 1505e12912d9STrond Myklebust } 1506e12912d9STrond Myklebust 1507a08a8cd3STrond Myklebust spin_lock(&inode->i_lock); 1508a08a8cd3STrond Myklebust nfs_writeback_check_extend(hdr, fattr); 1509a08a8cd3STrond Myklebust nfs_post_op_update_inode_force_wcc_locked(inode, fattr); 1510a08a8cd3STrond Myklebust spin_unlock(&inode->i_lock); 1511a08a8cd3STrond Myklebust } 1512a08a8cd3STrond Myklebust EXPORT_SYMBOL_GPL(nfs_writeback_update_inode); 1513a08a8cd3STrond Myklebust 15141da177e4SLinus Torvalds /* 15151da177e4SLinus Torvalds * This function is called when the WRITE call is complete. 15161da177e4SLinus Torvalds */ 1517d45f60c6SWeston Andros Adamson static int nfs_writeback_done(struct rpc_task *task, 1518d45f60c6SWeston Andros Adamson struct nfs_pgio_header *hdr, 15190eecb214SAnna Schumaker struct inode *inode) 15201da177e4SLinus Torvalds { 1521788e7a89STrond Myklebust int status; 15221da177e4SLinus Torvalds 1523f551e44fSChuck Lever /* 1524f551e44fSChuck Lever * ->write_done will attempt to use post-op attributes to detect 1525f551e44fSChuck Lever * conflicting writes by other clients. A strict interpretation 1526f551e44fSChuck Lever * of close-to-open would allow us to continue caching even if 1527f551e44fSChuck Lever * another writer had changed the file, but some applications 1528f551e44fSChuck Lever * depend on tighter cache coherency when writing. 1529f551e44fSChuck Lever */ 1530d45f60c6SWeston Andros Adamson status = NFS_PROTO(inode)->write_done(task, hdr); 1531788e7a89STrond Myklebust if (status != 0) 15320eecb214SAnna Schumaker return status; 15338224b273SChuck Lever 1534d45f60c6SWeston Andros Adamson nfs_add_stats(inode, NFSIOS_SERVERWRITTENBYTES, hdr->res.count); 15355bb2a7cbSTrond Myklebust trace_nfs_writeback_done(task, hdr); 153691d5b470SChuck Lever 153769d96651SJeff Layton if (task->tk_status >= 0) { 153869d96651SJeff Layton enum nfs3_stable_how committed = hdr->res.verf->committed; 153969d96651SJeff Layton 154069d96651SJeff Layton if (committed == NFS_UNSTABLE) { 154169d96651SJeff Layton /* 154269d96651SJeff Layton * We have some uncommitted data on the server at 154369d96651SJeff Layton * this point, so ensure that we keep track of that 154469d96651SJeff Layton * fact irrespective of what later writes do. 154569d96651SJeff Layton */ 154669d96651SJeff Layton set_bit(NFS_IOHDR_UNSTABLE_WRITES, &hdr->flags); 154769d96651SJeff Layton } 154869d96651SJeff Layton 154969d96651SJeff Layton if (committed < hdr->args.stable) { 15501da177e4SLinus Torvalds /* We tried a write call, but the server did not 15511da177e4SLinus Torvalds * commit data to stable storage even though we 15521da177e4SLinus Torvalds * requested it. 15531da177e4SLinus Torvalds * Note: There is a known bug in Tru64 < 5.0 in which 15541da177e4SLinus Torvalds * the server reports NFS_DATA_SYNC, but performs 15551da177e4SLinus Torvalds * NFS_FILE_SYNC. We therefore implement this checking 15561da177e4SLinus Torvalds * as a dprintk() in order to avoid filling syslog. 15571da177e4SLinus Torvalds */ 15581da177e4SLinus Torvalds static unsigned long complain; 15591da177e4SLinus Torvalds 1560a69aef14SFred Isaman /* Note this will print the MDS for a DS write */ 15611da177e4SLinus Torvalds if (time_before(complain, jiffies)) { 15621da177e4SLinus Torvalds dprintk("NFS: faulty NFS server %s:" 15631da177e4SLinus Torvalds " (committed = %d) != (stable = %d)\n", 1564cd841605SFred Isaman NFS_SERVER(inode)->nfs_client->cl_hostname, 156569d96651SJeff Layton committed, hdr->args.stable); 15661da177e4SLinus Torvalds complain = jiffies + 300 * HZ; 15671da177e4SLinus Torvalds } 15681da177e4SLinus Torvalds } 156969d96651SJeff Layton } 15701f2edbe3STrond Myklebust 15711f2edbe3STrond Myklebust /* Deal with the suid/sgid bit corner case */ 157216e14375STrond Myklebust if (nfs_should_remove_suid(inode)) { 157316e14375STrond Myklebust spin_lock(&inode->i_lock); 1574720869ebSTrond Myklebust nfs_set_cache_invalid(inode, NFS_INO_INVALID_MODE); 157516e14375STrond Myklebust spin_unlock(&inode->i_lock); 157616e14375STrond Myklebust } 15770eecb214SAnna Schumaker return 0; 15780eecb214SAnna Schumaker } 15790eecb214SAnna Schumaker 15800eecb214SAnna Schumaker /* 15810eecb214SAnna Schumaker * This function is called when the WRITE call is complete. 15820eecb214SAnna Schumaker */ 1583d45f60c6SWeston Andros Adamson static void nfs_writeback_result(struct rpc_task *task, 1584d45f60c6SWeston Andros Adamson struct nfs_pgio_header *hdr) 15850eecb214SAnna Schumaker { 1586d45f60c6SWeston Andros Adamson struct nfs_pgio_args *argp = &hdr->args; 1587d45f60c6SWeston Andros Adamson struct nfs_pgio_res *resp = &hdr->res; 15881f2edbe3STrond Myklebust 15891f2edbe3STrond Myklebust if (resp->count < argp->count) { 15901da177e4SLinus Torvalds static unsigned long complain; 15911da177e4SLinus Torvalds 15926c75dc0dSFred Isaman /* This a short write! */ 1593d45f60c6SWeston Andros Adamson nfs_inc_stats(hdr->inode, NFSIOS_SHORTWRITE); 159491d5b470SChuck Lever 15951da177e4SLinus Torvalds /* Has the server at least made some progress? */ 15966c75dc0dSFred Isaman if (resp->count == 0) { 15976c75dc0dSFred Isaman if (time_before(complain, jiffies)) { 15986c75dc0dSFred Isaman printk(KERN_WARNING 15996c75dc0dSFred Isaman "NFS: Server wrote zero bytes, expected %u.\n", 16006c75dc0dSFred Isaman argp->count); 16016c75dc0dSFred Isaman complain = jiffies + 300 * HZ; 16026c75dc0dSFred Isaman } 1603d45f60c6SWeston Andros Adamson nfs_set_pgio_error(hdr, -EIO, argp->offset); 16046c75dc0dSFred Isaman task->tk_status = -EIO; 16056c75dc0dSFred Isaman return; 16066c75dc0dSFred Isaman } 1607f8417b48SKinglong Mee 1608f8417b48SKinglong Mee /* For non rpc-based layout drivers, retry-through-MDS */ 1609f8417b48SKinglong Mee if (!task->tk_ops) { 1610f8417b48SKinglong Mee hdr->pnfs_error = -EAGAIN; 1611f8417b48SKinglong Mee return; 1612f8417b48SKinglong Mee } 1613f8417b48SKinglong Mee 16141da177e4SLinus Torvalds /* Was this an NFSv2 write or an NFSv3 stable write? */ 16151da177e4SLinus Torvalds if (resp->verf->committed != NFS_UNSTABLE) { 16161da177e4SLinus Torvalds /* Resend from where the server left off */ 1617d45f60c6SWeston Andros Adamson hdr->mds_offset += resp->count; 16181da177e4SLinus Torvalds argp->offset += resp->count; 16191da177e4SLinus Torvalds argp->pgbase += resp->count; 16201da177e4SLinus Torvalds argp->count -= resp->count; 16211da177e4SLinus Torvalds } else { 16221da177e4SLinus Torvalds /* Resend as a stable write in order to avoid 16231da177e4SLinus Torvalds * headaches in the case of a server crash. 16241da177e4SLinus Torvalds */ 16251da177e4SLinus Torvalds argp->stable = NFS_FILE_SYNC; 16261da177e4SLinus Torvalds } 16278c9cb714STrond Myklebust resp->count = 0; 16288c9cb714STrond Myklebust resp->verf->committed = 0; 1629d00c5d43STrond Myklebust rpc_restart_call_prepare(task); 16301da177e4SLinus Torvalds } 16311da177e4SLinus Torvalds } 16321da177e4SLinus Torvalds 1633af7cf057STrond Myklebust static int wait_on_commit(struct nfs_mds_commit_info *cinfo) 163471d0a611STrond Myklebust { 1635723c921eSPeter Zijlstra return wait_var_event_killable(&cinfo->rpcs_out, 1636723c921eSPeter Zijlstra !atomic_read(&cinfo->rpcs_out)); 1637af7cf057STrond Myklebust } 1638af7cf057STrond Myklebust 163917f46b80SJosef Bacik void nfs_commit_begin(struct nfs_mds_commit_info *cinfo) 1640af7cf057STrond Myklebust { 1641af7cf057STrond Myklebust atomic_inc(&cinfo->rpcs_out); 1642af7cf057STrond Myklebust } 1643af7cf057STrond Myklebust 1644133a48abSTrond Myklebust bool nfs_commit_end(struct nfs_mds_commit_info *cinfo) 1645af7cf057STrond Myklebust { 1646133a48abSTrond Myklebust if (atomic_dec_and_test(&cinfo->rpcs_out)) { 1647723c921eSPeter Zijlstra wake_up_var(&cinfo->rpcs_out); 1648133a48abSTrond Myklebust return true; 1649133a48abSTrond Myklebust } 1650133a48abSTrond Myklebust return false; 165171d0a611STrond Myklebust } 165271d0a611STrond Myklebust 16530b7c0153SFred Isaman void nfs_commitdata_release(struct nfs_commit_data *data) 16541da177e4SLinus Torvalds { 16550b7c0153SFred Isaman put_nfs_open_context(data->context); 16560b7c0153SFred Isaman nfs_commit_free(data); 16571da177e4SLinus Torvalds } 1658e0c2b380SFred Isaman EXPORT_SYMBOL_GPL(nfs_commitdata_release); 16591da177e4SLinus Torvalds 16600b7c0153SFred Isaman int nfs_initiate_commit(struct rpc_clnt *clnt, struct nfs_commit_data *data, 1661c36aae9aSPeng Tao const struct nfs_rpc_ops *nfs_ops, 16629ace33cdSFred Isaman const struct rpc_call_ops *call_ops, 16639f0ec176SAndy Adamson int how, int flags) 16641da177e4SLinus Torvalds { 166507737691STrond Myklebust struct rpc_task *task; 16669ace33cdSFred Isaman int priority = flush_task_priority(how); 1667bdc7f021STrond Myklebust struct rpc_message msg = { 1668bdc7f021STrond Myklebust .rpc_argp = &data->args, 1669bdc7f021STrond Myklebust .rpc_resp = &data->res, 16709ace33cdSFred Isaman .rpc_cred = data->cred, 1671bdc7f021STrond Myklebust }; 167284115e1cSTrond Myklebust struct rpc_task_setup task_setup_data = { 167307737691STrond Myklebust .task = &data->task, 16749ace33cdSFred Isaman .rpc_client = clnt, 1675bdc7f021STrond Myklebust .rpc_message = &msg, 16769ace33cdSFred Isaman .callback_ops = call_ops, 167784115e1cSTrond Myklebust .callback_data = data, 1678101070caSTrond Myklebust .workqueue = nfsiod_workqueue, 16794fa7ef69STrond Myklebust .flags = RPC_TASK_ASYNC | flags, 16803ff7576dSTrond Myklebust .priority = priority, 168184115e1cSTrond Myklebust }; 1682118f09edSOlga Kornievskaia 1683118f09edSOlga Kornievskaia if (nfs_server_capable(data->inode, NFS_CAP_MOVEABLE)) 1684118f09edSOlga Kornievskaia task_setup_data.flags |= RPC_TASK_MOVEABLE; 1685118f09edSOlga Kornievskaia 1686788e7a89STrond Myklebust /* Set up the initial task struct. */ 1687e9ae1ee2SAnna Schumaker nfs_ops->commit_setup(data, &msg, &task_setup_data.rpc_client); 16888224b273SChuck Lever trace_nfs_initiate_commit(data); 16891da177e4SLinus Torvalds 1690b4839ebeSKinglong Mee dprintk("NFS: initiated commit call\n"); 1691bdc7f021STrond Myklebust 169207737691STrond Myklebust task = rpc_run_task(&task_setup_data); 1693dbae4c73STrond Myklebust if (IS_ERR(task)) 1694dbae4c73STrond Myklebust return PTR_ERR(task); 1695d2224e7aSJeff Layton if (how & FLUSH_SYNC) 1696d2224e7aSJeff Layton rpc_wait_for_completion_task(task); 169707737691STrond Myklebust rpc_put_task(task); 1698dbae4c73STrond Myklebust return 0; 16991da177e4SLinus Torvalds } 1700e0c2b380SFred Isaman EXPORT_SYMBOL_GPL(nfs_initiate_commit); 17011da177e4SLinus Torvalds 1702378520b8SPeng Tao static loff_t nfs_get_lwb(struct list_head *head) 1703378520b8SPeng Tao { 1704378520b8SPeng Tao loff_t lwb = 0; 1705378520b8SPeng Tao struct nfs_page *req; 1706378520b8SPeng Tao 1707378520b8SPeng Tao list_for_each_entry(req, head, wb_list) 1708378520b8SPeng Tao if (lwb < (req_offset(req) + req->wb_bytes)) 1709378520b8SPeng Tao lwb = req_offset(req) + req->wb_bytes; 1710378520b8SPeng Tao 1711378520b8SPeng Tao return lwb; 1712378520b8SPeng Tao } 1713378520b8SPeng Tao 17141da177e4SLinus Torvalds /* 17159ace33cdSFred Isaman * Set up the argument/result storage required for the RPC call. 17169ace33cdSFred Isaman */ 17170b7c0153SFred Isaman void nfs_init_commit(struct nfs_commit_data *data, 1718988b6dceSFred Isaman struct list_head *head, 1719f453a54aSFred Isaman struct pnfs_layout_segment *lseg, 1720f453a54aSFred Isaman struct nfs_commit_info *cinfo) 17219ace33cdSFred Isaman { 172219573c93STrond Myklebust struct nfs_page *first; 172319573c93STrond Myklebust struct nfs_open_context *ctx; 172419573c93STrond Myklebust struct inode *inode; 17259ace33cdSFred Isaman 17269ace33cdSFred Isaman /* Set up the RPC argument and reply structs 17279ace33cdSFred Isaman * NB: take care not to mess about with data->commit et al. */ 17289ace33cdSFred Isaman 172919573c93STrond Myklebust if (head) 17309ace33cdSFred Isaman list_splice_init(head, &data->pages); 17319ace33cdSFred Isaman 173219573c93STrond Myklebust first = nfs_list_entry(data->pages.next); 173319573c93STrond Myklebust ctx = nfs_req_openctx(first); 173419573c93STrond Myklebust inode = d_inode(ctx->dentry); 173519573c93STrond Myklebust 17369ace33cdSFred Isaman data->inode = inode; 17379fcd5960STrond Myklebust data->cred = ctx->cred; 1738988b6dceSFred Isaman data->lseg = lseg; /* reference transferred */ 1739378520b8SPeng Tao /* only set lwb for pnfs commit */ 1740378520b8SPeng Tao if (lseg) 1741378520b8SPeng Tao data->lwb = nfs_get_lwb(&data->pages); 17429ace33cdSFred Isaman data->mds_ops = &nfs_commit_ops; 1743f453a54aSFred Isaman data->completion_ops = cinfo->completion_ops; 1744b359f9d0SFred Isaman data->dreq = cinfo->dreq; 17459ace33cdSFred Isaman 17469ace33cdSFred Isaman data->args.fh = NFS_FH(data->inode); 17479ace33cdSFred Isaman /* Note: we always request a commit of the entire inode */ 17489ace33cdSFred Isaman data->args.offset = 0; 17499ace33cdSFred Isaman data->args.count = 0; 17509fcd5960STrond Myklebust data->context = get_nfs_open_context(ctx); 17519ace33cdSFred Isaman data->res.fattr = &data->fattr; 17529ace33cdSFred Isaman data->res.verf = &data->verf; 17539ace33cdSFred Isaman nfs_fattr_init(&data->fattr); 1754133a48abSTrond Myklebust nfs_commit_begin(cinfo->mds); 17559ace33cdSFred Isaman } 1756e0c2b380SFred Isaman EXPORT_SYMBOL_GPL(nfs_init_commit); 17579ace33cdSFred Isaman 1758e0c2b380SFred Isaman void nfs_retry_commit(struct list_head *page_list, 1759ea2cf228SFred Isaman struct pnfs_layout_segment *lseg, 1760b57ff130SWeston Andros Adamson struct nfs_commit_info *cinfo, 1761b57ff130SWeston Andros Adamson u32 ds_commit_idx) 176264bfeb49SFred Isaman { 176364bfeb49SFred Isaman struct nfs_page *req; 176464bfeb49SFred Isaman 176564bfeb49SFred Isaman while (!list_empty(page_list)) { 176664bfeb49SFred Isaman req = nfs_list_entry(page_list->next); 176764bfeb49SFred Isaman nfs_list_remove_request(req); 1768b57ff130SWeston Andros Adamson nfs_mark_request_commit(req, lseg, cinfo, ds_commit_idx); 17690c493b5cSTrond Myklebust nfs_folio_clear_commit(nfs_page_to_folio(req)); 17701d1afcbcSTrond Myklebust nfs_unlock_and_release_request(req); 177164bfeb49SFred Isaman } 177264bfeb49SFred Isaman } 1773e0c2b380SFred Isaman EXPORT_SYMBOL_GPL(nfs_retry_commit); 177464bfeb49SFred Isaman 17750c493b5cSTrond Myklebust static void nfs_commit_resched_write(struct nfs_commit_info *cinfo, 1776b20135d0STrond Myklebust struct nfs_page *req) 1777b20135d0STrond Myklebust { 17780c493b5cSTrond Myklebust struct folio *folio = nfs_page_to_folio(req); 17790c493b5cSTrond Myklebust 17800c493b5cSTrond Myklebust filemap_dirty_folio(folio_mapping(folio), folio); 1781b20135d0STrond Myklebust } 1782b20135d0STrond Myklebust 17839ace33cdSFred Isaman /* 17841da177e4SLinus Torvalds * Commit dirty pages 17851da177e4SLinus Torvalds */ 17861da177e4SLinus Torvalds static int 1787ea2cf228SFred Isaman nfs_commit_list(struct inode *inode, struct list_head *head, int how, 1788ea2cf228SFred Isaman struct nfs_commit_info *cinfo) 17891da177e4SLinus Torvalds { 17900b7c0153SFred Isaman struct nfs_commit_data *data; 179185e39feeSOlga Kornievskaia unsigned short task_flags = 0; 17921da177e4SLinus Torvalds 1793ade8febdSWeston Andros Adamson /* another commit raced with us */ 1794ade8febdSWeston Andros Adamson if (list_empty(head)) 1795ade8febdSWeston Andros Adamson return 0; 1796ade8febdSWeston Andros Adamson 1797515dcdcdSTrond Myklebust data = nfs_commitdata_alloc(); 1798515dcdcdSTrond Myklebust if (!data) { 1799515dcdcdSTrond Myklebust nfs_retry_commit(head, NULL, cinfo, -1); 1800515dcdcdSTrond Myklebust return -ENOMEM; 1801515dcdcdSTrond Myklebust } 18021da177e4SLinus Torvalds 18031da177e4SLinus Torvalds /* Set up the argument struct */ 1804f453a54aSFred Isaman nfs_init_commit(data, head, NULL, cinfo); 180585e39feeSOlga Kornievskaia if (NFS_SERVER(inode)->nfs_client->cl_minorversion) 180685e39feeSOlga Kornievskaia task_flags = RPC_TASK_MOVEABLE; 1807c36aae9aSPeng Tao return nfs_initiate_commit(NFS_CLIENT(inode), data, NFS_PROTO(inode), 180885e39feeSOlga Kornievskaia data->mds_ops, how, 180985e39feeSOlga Kornievskaia RPC_TASK_CRED_NOREF | task_flags); 18101da177e4SLinus Torvalds } 18111da177e4SLinus Torvalds 18121da177e4SLinus Torvalds /* 18131da177e4SLinus Torvalds * COMMIT call returned 18141da177e4SLinus Torvalds */ 1815788e7a89STrond Myklebust static void nfs_commit_done(struct rpc_task *task, void *calldata) 18161da177e4SLinus Torvalds { 18170b7c0153SFred Isaman struct nfs_commit_data *data = calldata; 18181da177e4SLinus Torvalds 1819788e7a89STrond Myklebust /* Call the NFS version-specific code */ 1820c0d0e96bSTrond Myklebust NFS_PROTO(data->inode)->commit_done(task, data); 18217bdd297eSTrond Myklebust trace_nfs_commit_done(task, data); 1822c9d8f89dSTrond Myklebust } 1823c9d8f89dSTrond Myklebust 1824f453a54aSFred Isaman static void nfs_commit_release_pages(struct nfs_commit_data *data) 1825c9d8f89dSTrond Myklebust { 1826221203ceSTrond Myklebust const struct nfs_writeverf *verf = data->res.verf; 1827c9d8f89dSTrond Myklebust struct nfs_page *req; 1828c9d8f89dSTrond Myklebust int status = data->task.tk_status; 1829f453a54aSFred Isaman struct nfs_commit_info cinfo; 18300c493b5cSTrond Myklebust struct folio *folio; 1831788e7a89STrond Myklebust 18321da177e4SLinus Torvalds while (!list_empty(&data->pages)) { 18331da177e4SLinus Torvalds req = nfs_list_entry(data->pages.next); 18341da177e4SLinus Torvalds nfs_list_remove_request(req); 18350c493b5cSTrond Myklebust folio = nfs_page_to_folio(req); 18360c493b5cSTrond Myklebust nfs_folio_clear_commit(folio); 18371da177e4SLinus Torvalds 18381e8968c5SNiels de Vos dprintk("NFS: commit (%s/%llu %d@%lld)", 18399fcd5960STrond Myklebust nfs_req_openctx(req)->dentry->d_sb->s_id, 18409fcd5960STrond Myklebust (unsigned long long)NFS_FILEID(d_inode(nfs_req_openctx(req)->dentry)), 18411da177e4SLinus Torvalds req->wb_bytes, 18421da177e4SLinus Torvalds (long long)req_offset(req)); 1843c9d8f89dSTrond Myklebust if (status < 0) { 18440c493b5cSTrond Myklebust if (folio) { 1845af887e43STrond Myklebust trace_nfs_commit_error(data->inode, req, 1846af887e43STrond Myklebust status); 18470c493b5cSTrond Myklebust nfs_mapping_set_error(folio, status); 18481da177e4SLinus Torvalds nfs_inode_remove_request(req); 18496fbda89bSTrond Myklebust } 1850ddeaa637SJoe Perches dprintk_cont(", error = %d\n", status); 18511da177e4SLinus Torvalds goto next; 18521da177e4SLinus Torvalds } 18531da177e4SLinus Torvalds 18541da177e4SLinus Torvalds /* Okay, COMMIT succeeded, apparently. Check the verifier 18551da177e4SLinus Torvalds * returned by the server against all stored verfs. */ 18561f28476dSTrond Myklebust if (nfs_write_match_verf(verf, req)) { 18571da177e4SLinus Torvalds /* We have a match */ 18580c493b5cSTrond Myklebust if (folio) 18591da177e4SLinus Torvalds nfs_inode_remove_request(req); 1860ddeaa637SJoe Perches dprintk_cont(" OK\n"); 18611da177e4SLinus Torvalds goto next; 18621da177e4SLinus Torvalds } 18631da177e4SLinus Torvalds /* We have a mismatch. Write the page again */ 1864ddeaa637SJoe Perches dprintk_cont(" mismatch\n"); 18656d884e8fSFred nfs_mark_request_dirty(req); 186667f4b5dcSTrond Myklebust atomic_long_inc(&NFS_I(data->inode)->redirtied_pages); 18671da177e4SLinus Torvalds next: 18681d1afcbcSTrond Myklebust nfs_unlock_and_release_request(req); 18697f1bda44STrond Myklebust /* Latency breaker */ 18707f1bda44STrond Myklebust cond_resched(); 18711da177e4SLinus Torvalds } 1872353db796SNeilBrown 1873f453a54aSFred Isaman nfs_init_cinfo(&cinfo, data->inode, data->dreq); 1874af7cf057STrond Myklebust nfs_commit_end(cinfo.mds); 18755917ce84SFred Isaman } 18765917ce84SFred Isaman 18775917ce84SFred Isaman static void nfs_commit_release(void *calldata) 18785917ce84SFred Isaman { 18790b7c0153SFred Isaman struct nfs_commit_data *data = calldata; 18805917ce84SFred Isaman 1881f453a54aSFred Isaman data->completion_ops->completion(data); 1882c9d8f89dSTrond Myklebust nfs_commitdata_release(calldata); 18831da177e4SLinus Torvalds } 1884788e7a89STrond Myklebust 1885788e7a89STrond Myklebust static const struct rpc_call_ops nfs_commit_ops = { 18860b7c0153SFred Isaman .rpc_call_prepare = nfs_commit_prepare, 1887788e7a89STrond Myklebust .rpc_call_done = nfs_commit_done, 1888788e7a89STrond Myklebust .rpc_release = nfs_commit_release, 1889788e7a89STrond Myklebust }; 18901da177e4SLinus Torvalds 1891f453a54aSFred Isaman static const struct nfs_commit_completion_ops nfs_commit_completion_ops = { 1892f453a54aSFred Isaman .completion = nfs_commit_release_pages, 1893b20135d0STrond Myklebust .resched_write = nfs_commit_resched_write, 1894f453a54aSFred Isaman }; 1895f453a54aSFred Isaman 18961763da12SFred Isaman int nfs_generic_commit_list(struct inode *inode, struct list_head *head, 1897ea2cf228SFred Isaman int how, struct nfs_commit_info *cinfo) 189884c53ab5SFred Isaman { 189984c53ab5SFred Isaman int status; 190084c53ab5SFred Isaman 1901ea2cf228SFred Isaman status = pnfs_commit_list(inode, head, how, cinfo); 190284c53ab5SFred Isaman if (status == PNFS_NOT_ATTEMPTED) 1903ea2cf228SFred Isaman status = nfs_commit_list(inode, head, how, cinfo); 190484c53ab5SFred Isaman return status; 190584c53ab5SFred Isaman } 190684c53ab5SFred Isaman 1907c4f24df9STrond Myklebust static int __nfs_commit_inode(struct inode *inode, int how, 1908c4f24df9STrond Myklebust struct writeback_control *wbc) 19091da177e4SLinus Torvalds { 19101da177e4SLinus Torvalds LIST_HEAD(head); 1911ea2cf228SFred Isaman struct nfs_commit_info cinfo; 191271d0a611STrond Myklebust int may_wait = how & FLUSH_SYNC; 1913c4f24df9STrond Myklebust int ret, nscan; 19141da177e4SLinus Torvalds 191564a93dbfSTrond Myklebust how &= ~FLUSH_SYNC; 1916ea2cf228SFred Isaman nfs_init_cinfo_from_inode(&cinfo, inode); 1917af7cf057STrond Myklebust nfs_commit_begin(cinfo.mds); 1918c4f24df9STrond Myklebust for (;;) { 1919c4f24df9STrond Myklebust ret = nscan = nfs_scan_commit(inode, &head, &cinfo); 1920c4f24df9STrond Myklebust if (ret <= 0) 1921c4f24df9STrond Myklebust break; 1922c4f24df9STrond Myklebust ret = nfs_generic_commit_list(inode, &head, how, &cinfo); 1923c4f24df9STrond Myklebust if (ret < 0) 1924c4f24df9STrond Myklebust break; 1925c4f24df9STrond Myklebust ret = 0; 1926c4f24df9STrond Myklebust if (wbc && wbc->sync_mode == WB_SYNC_NONE) { 1927c4f24df9STrond Myklebust if (nscan < wbc->nr_to_write) 1928c4f24df9STrond Myklebust wbc->nr_to_write -= nscan; 1929c4f24df9STrond Myklebust else 1930c4f24df9STrond Myklebust wbc->nr_to_write = 0; 1931c4f24df9STrond Myklebust } 1932c4f24df9STrond Myklebust if (nscan < INT_MAX) 1933c4f24df9STrond Myklebust break; 1934c4f24df9STrond Myklebust cond_resched(); 1935c4f24df9STrond Myklebust } 1936af7cf057STrond Myklebust nfs_commit_end(cinfo.mds); 1937c4f24df9STrond Myklebust if (ret || !may_wait) 1938c4f24df9STrond Myklebust return ret; 1939c4f24df9STrond Myklebust return wait_on_commit(cinfo.mds); 1940c4f24df9STrond Myklebust } 1941c4f24df9STrond Myklebust 1942c4f24df9STrond Myklebust int nfs_commit_inode(struct inode *inode, int how) 1943c4f24df9STrond Myklebust { 1944c4f24df9STrond Myklebust return __nfs_commit_inode(inode, how, NULL); 19451da177e4SLinus Torvalds } 1946b20135d0STrond Myklebust EXPORT_SYMBOL_GPL(nfs_commit_inode); 19478fc795f7STrond Myklebust 1948ae09c31fSAnna Schumaker int nfs_write_inode(struct inode *inode, struct writeback_control *wbc) 19498fc795f7STrond Myklebust { 1950420e3646STrond Myklebust struct nfs_inode *nfsi = NFS_I(inode); 1951420e3646STrond Myklebust int flags = FLUSH_SYNC; 1952420e3646STrond Myklebust int ret = 0; 19538fc795f7STrond Myklebust 1954c4f24df9STrond Myklebust if (wbc->sync_mode == WB_SYNC_NONE) { 19553236c3e1SJeff Layton /* no commits means nothing needs to be done */ 19565cb953d4STrond Myklebust if (!atomic_long_read(&nfsi->commit_info.ncommit)) 1957c4f24df9STrond Myklebust goto check_requests_outstanding; 19583236c3e1SJeff Layton 1959a00dd6c0SJeff Layton /* Don't commit yet if this is a non-blocking flush and there 1960a00dd6c0SJeff Layton * are a lot of outstanding writes for this mapping. 1961420e3646STrond Myklebust */ 19621a4edf0fSTrond Myklebust if (mapping_tagged(inode->i_mapping, PAGECACHE_TAG_WRITEBACK)) 1963420e3646STrond Myklebust goto out_mark_dirty; 1964420e3646STrond Myklebust 1965a00dd6c0SJeff Layton /* don't wait for the COMMIT response */ 1966420e3646STrond Myklebust flags = 0; 1967a00dd6c0SJeff Layton } 1968a00dd6c0SJeff Layton 1969c4f24df9STrond Myklebust ret = __nfs_commit_inode(inode, flags, wbc); 1970c4f24df9STrond Myklebust if (!ret) { 1971c4f24df9STrond Myklebust if (flags & FLUSH_SYNC) 19728fc795f7STrond Myklebust return 0; 1973c4f24df9STrond Myklebust } else if (atomic_long_read(&nfsi->commit_info.ncommit)) 1974c4f24df9STrond Myklebust goto out_mark_dirty; 1975c4f24df9STrond Myklebust 1976c4f24df9STrond Myklebust check_requests_outstanding: 1977c4f24df9STrond Myklebust if (!atomic_read(&nfsi->commit_info.rpcs_out)) 1978c4f24df9STrond Myklebust return ret; 1979420e3646STrond Myklebust out_mark_dirty: 19808fc795f7STrond Myklebust __mark_inode_dirty(inode, I_DIRTY_DATASYNC); 19818fc795f7STrond Myklebust return ret; 19828fc795f7STrond Myklebust } 198389d77c8fSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_write_inode); 1984863a3c6cSAndy Adamson 1985acdc53b2STrond Myklebust /* 1986837bb1d7STrond Myklebust * Wrapper for filemap_write_and_wait_range() 1987837bb1d7STrond Myklebust * 1988837bb1d7STrond Myklebust * Needed for pNFS in order to ensure data becomes visible to the 1989837bb1d7STrond Myklebust * client. 1990837bb1d7STrond Myklebust */ 1991837bb1d7STrond Myklebust int nfs_filemap_write_and_wait_range(struct address_space *mapping, 1992837bb1d7STrond Myklebust loff_t lstart, loff_t lend) 1993837bb1d7STrond Myklebust { 1994837bb1d7STrond Myklebust int ret; 1995837bb1d7STrond Myklebust 1996837bb1d7STrond Myklebust ret = filemap_write_and_wait_range(mapping, lstart, lend); 1997837bb1d7STrond Myklebust if (ret == 0) 1998837bb1d7STrond Myklebust ret = pnfs_sync_inode(mapping->host, true); 1999837bb1d7STrond Myklebust return ret; 2000837bb1d7STrond Myklebust } 2001837bb1d7STrond Myklebust EXPORT_SYMBOL_GPL(nfs_filemap_write_and_wait_range); 2002837bb1d7STrond Myklebust 2003837bb1d7STrond Myklebust /* 2004acdc53b2STrond Myklebust * flush the inode to disk. 2005acdc53b2STrond Myklebust */ 2006acdc53b2STrond Myklebust int nfs_wb_all(struct inode *inode) 200734901f70STrond Myklebust { 2008f4ce1299STrond Myklebust int ret; 200934901f70STrond Myklebust 2010f4ce1299STrond Myklebust trace_nfs_writeback_inode_enter(inode); 2011f4ce1299STrond Myklebust 20125bb89b47STrond Myklebust ret = filemap_write_and_wait(inode->i_mapping); 20136b196875SChuck Lever if (ret) 20146b196875SChuck Lever goto out; 20155bb89b47STrond Myklebust ret = nfs_commit_inode(inode, FLUSH_SYNC); 20166b196875SChuck Lever if (ret < 0) 20176b196875SChuck Lever goto out; 20185bb89b47STrond Myklebust pnfs_sync_inode(inode, true); 20196b196875SChuck Lever ret = 0; 2020f4ce1299STrond Myklebust 20216b196875SChuck Lever out: 2022f4ce1299STrond Myklebust trace_nfs_writeback_inode_exit(inode, ret); 2023f4ce1299STrond Myklebust return ret; 20241c75950bSTrond Myklebust } 2025ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_wb_all); 20261c75950bSTrond Myklebust 20276d740c76SMatthew Wilcox (Oracle) int nfs_wb_folio_cancel(struct inode *inode, struct folio *folio) 20281b3b4a1aSTrond Myklebust { 20291b3b4a1aSTrond Myklebust struct nfs_page *req; 20301b3b4a1aSTrond Myklebust int ret = 0; 20311b3b4a1aSTrond Myklebust 20326d740c76SMatthew Wilcox (Oracle) folio_wait_writeback(folio); 20333e217045SWeston Andros Adamson 20343e217045SWeston Andros Adamson /* blocking call to cancel all requests and join to a single (head) 20353e217045SWeston Andros Adamson * request */ 20360c493b5cSTrond Myklebust req = nfs_lock_and_join_requests(folio); 20373e217045SWeston Andros Adamson 20383e217045SWeston Andros Adamson if (IS_ERR(req)) { 20393e217045SWeston Andros Adamson ret = PTR_ERR(req); 20403e217045SWeston Andros Adamson } else if (req) { 20416d740c76SMatthew Wilcox (Oracle) /* all requests from this folio have been cancelled by 20423e217045SWeston Andros Adamson * nfs_lock_and_join_requests, so just remove the head 20433e217045SWeston Andros Adamson * request from the inode / page_private pointer and 20443e217045SWeston Andros Adamson * release it */ 20451b3b4a1aSTrond Myklebust nfs_inode_remove_request(req); 20461d1afcbcSTrond Myklebust nfs_unlock_and_release_request(req); 20471b3b4a1aSTrond Myklebust } 20483e217045SWeston Andros Adamson 20491b3b4a1aSTrond Myklebust return ret; 20501b3b4a1aSTrond Myklebust } 20511b3b4a1aSTrond Myklebust 20525241060eSTrond Myklebust /** 20535241060eSTrond Myklebust * nfs_wb_folio - Write back all requests on one page 20545241060eSTrond Myklebust * @inode: pointer to page 20555241060eSTrond Myklebust * @folio: pointer to folio 20565241060eSTrond Myklebust * 20575241060eSTrond Myklebust * Assumes that the folio has been locked by the caller, and will 20585241060eSTrond Myklebust * not unlock it. 20591c75950bSTrond Myklebust */ 20605241060eSTrond Myklebust int nfs_wb_folio(struct inode *inode, struct folio *folio) 20611c75950bSTrond Myklebust { 20625241060eSTrond Myklebust loff_t range_start = folio_file_pos(folio); 20635241060eSTrond Myklebust loff_t range_end = range_start + (loff_t)folio_size(folio) - 1; 20647f2f12d9STrond Myklebust struct writeback_control wbc = { 20657f2f12d9STrond Myklebust .sync_mode = WB_SYNC_ALL, 20667f2f12d9STrond Myklebust .nr_to_write = 0, 20677f2f12d9STrond Myklebust .range_start = range_start, 20687f2f12d9STrond Myklebust .range_end = range_end, 20697f2f12d9STrond Myklebust }; 20707f2f12d9STrond Myklebust int ret; 20717f2f12d9STrond Myklebust 2072256093feSTrond Myklebust trace_nfs_writeback_folio(inode, folio); 2073f4ce1299STrond Myklebust 20740522f6adSTrond Myklebust for (;;) { 20755241060eSTrond Myklebust folio_wait_writeback(folio); 20765241060eSTrond Myklebust if (folio_clear_dirty_for_io(folio)) { 20770c493b5cSTrond Myklebust ret = nfs_writepage_locked(folio, &wbc); 20787f2f12d9STrond Myklebust if (ret < 0) 20797f2f12d9STrond Myklebust goto out_error; 20800522f6adSTrond Myklebust continue; 20817f2f12d9STrond Myklebust } 2082f4ce1299STrond Myklebust ret = 0; 20835241060eSTrond Myklebust if (!folio_test_private(folio)) 20840522f6adSTrond Myklebust break; 20850522f6adSTrond Myklebust ret = nfs_commit_inode(inode, FLUSH_SYNC); 20867f2f12d9STrond Myklebust if (ret < 0) 20877f2f12d9STrond Myklebust goto out_error; 20887f2f12d9STrond Myklebust } 20897f2f12d9STrond Myklebust out_error: 2090256093feSTrond Myklebust trace_nfs_writeback_folio_done(inode, folio, ret); 20917f2f12d9STrond Myklebust return ret; 20921c75950bSTrond Myklebust } 20931c75950bSTrond Myklebust 2094074cc1deSTrond Myklebust #ifdef CONFIG_MIGRATION 20954ae84a80SMatthew Wilcox (Oracle) int nfs_migrate_folio(struct address_space *mapping, struct folio *dst, 20964ae84a80SMatthew Wilcox (Oracle) struct folio *src, enum migrate_mode mode) 2097074cc1deSTrond Myklebust { 20982da95652SJeff Layton /* 20994ae84a80SMatthew Wilcox (Oracle) * If the private flag is set, the folio is currently associated with 21002da95652SJeff Layton * an in-progress read or write request. Don't try to migrate it. 21012da95652SJeff Layton * 21022da95652SJeff Layton * FIXME: we could do this in principle, but we'll need a way to ensure 21032da95652SJeff Layton * that we can safely release the inode reference while holding 21044ae84a80SMatthew Wilcox (Oracle) * the folio lock. 21052da95652SJeff Layton */ 21064ae84a80SMatthew Wilcox (Oracle) if (folio_test_private(src)) 21072da95652SJeff Layton return -EBUSY; 2108074cc1deSTrond Myklebust 21092e9d7e4bSDavid Howells if (folio_test_private_2(src)) { /* [DEPRECATED] */ 211016f2f4e6SDavid Howells if (mode == MIGRATE_ASYNC) 21118c209ce7SDavid Howells return -EBUSY; 21122e9d7e4bSDavid Howells folio_wait_private_2(src); 211316f2f4e6SDavid Howells } 2114074cc1deSTrond Myklebust 211554184650SMatthew Wilcox (Oracle) return migrate_folio(mapping, dst, src, mode); 2116074cc1deSTrond Myklebust } 2117074cc1deSTrond Myklebust #endif 2118074cc1deSTrond Myklebust 2119f7b422b1SDavid Howells int __init nfs_init_writepagecache(void) 21201da177e4SLinus Torvalds { 21211da177e4SLinus Torvalds nfs_wdata_cachep = kmem_cache_create("nfs_write_data", 21221e7f3a48SWeston Andros Adamson sizeof(struct nfs_pgio_header), 21231da177e4SLinus Torvalds 0, SLAB_HWCACHE_ALIGN, 212420c2df83SPaul Mundt NULL); 21251da177e4SLinus Torvalds if (nfs_wdata_cachep == NULL) 21261da177e4SLinus Torvalds return -ENOMEM; 21271da177e4SLinus Torvalds 212893d2341cSMatthew Dobson nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE, 21291da177e4SLinus Torvalds nfs_wdata_cachep); 21301da177e4SLinus Torvalds if (nfs_wdata_mempool == NULL) 21313dd4765fSJeff Layton goto out_destroy_write_cache; 21321da177e4SLinus Torvalds 21330b7c0153SFred Isaman nfs_cdata_cachep = kmem_cache_create("nfs_commit_data", 21340b7c0153SFred Isaman sizeof(struct nfs_commit_data), 21350b7c0153SFred Isaman 0, SLAB_HWCACHE_ALIGN, 21360b7c0153SFred Isaman NULL); 21370b7c0153SFred Isaman if (nfs_cdata_cachep == NULL) 21383dd4765fSJeff Layton goto out_destroy_write_mempool; 21390b7c0153SFred Isaman 214093d2341cSMatthew Dobson nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT, 21414c100210SYanchuan Nian nfs_cdata_cachep); 21421da177e4SLinus Torvalds if (nfs_commit_mempool == NULL) 21433dd4765fSJeff Layton goto out_destroy_commit_cache; 21441da177e4SLinus Torvalds 214589a09141SPeter Zijlstra /* 214689a09141SPeter Zijlstra * NFS congestion size, scale with available memory. 214789a09141SPeter Zijlstra * 214889a09141SPeter Zijlstra * 64MB: 8192k 214989a09141SPeter Zijlstra * 128MB: 11585k 215089a09141SPeter Zijlstra * 256MB: 16384k 215189a09141SPeter Zijlstra * 512MB: 23170k 215289a09141SPeter Zijlstra * 1GB: 32768k 215389a09141SPeter Zijlstra * 2GB: 46340k 215489a09141SPeter Zijlstra * 4GB: 65536k 215589a09141SPeter Zijlstra * 8GB: 92681k 215689a09141SPeter Zijlstra * 16GB: 131072k 215789a09141SPeter Zijlstra * 215889a09141SPeter Zijlstra * This allows larger machines to have larger/more transfers. 215989a09141SPeter Zijlstra * Limit the default to 256M 216089a09141SPeter Zijlstra */ 2161ca79b0c2SArun KS nfs_congestion_kb = (16*int_sqrt(totalram_pages())) << (PAGE_SHIFT-10); 216289a09141SPeter Zijlstra if (nfs_congestion_kb > 256*1024) 216389a09141SPeter Zijlstra nfs_congestion_kb = 256*1024; 216489a09141SPeter Zijlstra 21651da177e4SLinus Torvalds return 0; 21663dd4765fSJeff Layton 21673dd4765fSJeff Layton out_destroy_commit_cache: 21683dd4765fSJeff Layton kmem_cache_destroy(nfs_cdata_cachep); 21693dd4765fSJeff Layton out_destroy_write_mempool: 21703dd4765fSJeff Layton mempool_destroy(nfs_wdata_mempool); 21713dd4765fSJeff Layton out_destroy_write_cache: 21723dd4765fSJeff Layton kmem_cache_destroy(nfs_wdata_cachep); 21733dd4765fSJeff Layton return -ENOMEM; 21741da177e4SLinus Torvalds } 21751da177e4SLinus Torvalds 2176266bee88SDavid Brownell void nfs_destroy_writepagecache(void) 21771da177e4SLinus Torvalds { 21781da177e4SLinus Torvalds mempool_destroy(nfs_commit_mempool); 21793dd4765fSJeff Layton kmem_cache_destroy(nfs_cdata_cachep); 21801da177e4SLinus Torvalds mempool_destroy(nfs_wdata_mempool); 21811a1d92c1SAlexey Dobriyan kmem_cache_destroy(nfs_wdata_cachep); 21821da177e4SLinus Torvalds } 21831da177e4SLinus Torvalds 21844a0de55cSAnna Schumaker static const struct nfs_rw_ops nfs_rw_write_ops = { 21854a0de55cSAnna Schumaker .rw_alloc_header = nfs_writehdr_alloc, 21864a0de55cSAnna Schumaker .rw_free_header = nfs_writehdr_free, 21870eecb214SAnna Schumaker .rw_done = nfs_writeback_done, 21880eecb214SAnna Schumaker .rw_result = nfs_writeback_result, 21891ed26f33SAnna Schumaker .rw_initiate = nfs_initiate_write, 21904a0de55cSAnna Schumaker }; 2191