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> 283fcfab16SAndrew Morton 297c0f6ba6SLinus Torvalds #include <linux/uaccess.h> 30875bc3fbSTrond Myklebust #include <linux/sched/mm.h> 311da177e4SLinus Torvalds 321da177e4SLinus Torvalds #include "delegation.h" 3349a70f27STrond Myklebust #include "internal.h" 3491d5b470SChuck Lever #include "iostat.h" 35def6ed7eSAndy Adamson #include "nfs4_fs.h" 36074cc1deSTrond Myklebust #include "fscache.h" 3794ad1c80SFred Isaman #include "pnfs.h" 381da177e4SLinus Torvalds 39f4ce1299STrond Myklebust #include "nfstrace.h" 40f4ce1299STrond Myklebust 411da177e4SLinus Torvalds #define NFSDBG_FACILITY NFSDBG_PAGECACHE 421da177e4SLinus Torvalds 431da177e4SLinus Torvalds #define MIN_POOL_WRITE (32) 441da177e4SLinus Torvalds #define MIN_POOL_COMMIT (4) 451da177e4SLinus Torvalds 46919e3bd9STrond Myklebust struct nfs_io_completion { 47919e3bd9STrond Myklebust void (*complete)(void *data); 48919e3bd9STrond Myklebust void *data; 49919e3bd9STrond Myklebust struct kref refcount; 50919e3bd9STrond Myklebust }; 51919e3bd9STrond Myklebust 521da177e4SLinus Torvalds /* 531da177e4SLinus Torvalds * Local function declarations 541da177e4SLinus Torvalds */ 55f8512ad0SFred Isaman static void nfs_redirty_request(struct nfs_page *req); 56788e7a89STrond Myklebust static const struct rpc_call_ops nfs_commit_ops; 57061ae2edSFred Isaman static const struct nfs_pgio_completion_ops nfs_async_write_completion_ops; 58f453a54aSFred Isaman static const struct nfs_commit_completion_ops nfs_commit_completion_ops; 594a0de55cSAnna Schumaker static const struct nfs_rw_ops nfs_rw_write_ops; 6006c9fdf3STrond Myklebust static void nfs_inode_remove_request(struct nfs_page *req); 61d4581383SWeston Andros Adamson static void nfs_clear_request_commit(struct nfs_page *req); 6202d1426cSWeston Andros Adamson static void nfs_init_cinfo_from_inode(struct nfs_commit_info *cinfo, 6302d1426cSWeston Andros Adamson struct inode *inode); 643a3908c8STrond Myklebust static struct nfs_page * 653a3908c8STrond Myklebust nfs_page_search_commits_for_head_request_locked(struct nfs_inode *nfsi, 663a3908c8STrond Myklebust struct page *page); 671da177e4SLinus Torvalds 68e18b890bSChristoph Lameter static struct kmem_cache *nfs_wdata_cachep; 693feb2d49STrond Myklebust static mempool_t *nfs_wdata_mempool; 700b7c0153SFred Isaman static struct kmem_cache *nfs_cdata_cachep; 711da177e4SLinus Torvalds static mempool_t *nfs_commit_mempool; 721da177e4SLinus Torvalds 73518662e0SNeilBrown struct nfs_commit_data *nfs_commitdata_alloc(bool never_fail) 741da177e4SLinus Torvalds { 75518662e0SNeilBrown struct nfs_commit_data *p; 7640859d7eSChuck Lever 77518662e0SNeilBrown if (never_fail) 78518662e0SNeilBrown p = mempool_alloc(nfs_commit_mempool, GFP_NOIO); 79518662e0SNeilBrown else { 80518662e0SNeilBrown /* It is OK to do some reclaim, not no safe to wait 81518662e0SNeilBrown * for anything to be returned to the pool. 82518662e0SNeilBrown * mempool_alloc() cannot handle that particular combination, 83518662e0SNeilBrown * so we need two separate attempts. 84518662e0SNeilBrown */ 85518662e0SNeilBrown p = mempool_alloc(nfs_commit_mempool, GFP_NOWAIT); 86518662e0SNeilBrown if (!p) 87518662e0SNeilBrown p = kmem_cache_alloc(nfs_cdata_cachep, GFP_NOIO | 88518662e0SNeilBrown __GFP_NOWARN | __GFP_NORETRY); 89518662e0SNeilBrown if (!p) 90518662e0SNeilBrown return NULL; 91518662e0SNeilBrown } 92518662e0SNeilBrown 931da177e4SLinus Torvalds memset(p, 0, sizeof(*p)); 941da177e4SLinus Torvalds INIT_LIST_HEAD(&p->pages); 951da177e4SLinus Torvalds return p; 961da177e4SLinus Torvalds } 97e0c2b380SFred Isaman EXPORT_SYMBOL_GPL(nfs_commitdata_alloc); 981da177e4SLinus Torvalds 990b7c0153SFred Isaman void nfs_commit_free(struct nfs_commit_data *p) 1001da177e4SLinus Torvalds { 1011da177e4SLinus Torvalds mempool_free(p, nfs_commit_mempool); 1021da177e4SLinus Torvalds } 103e0c2b380SFred Isaman EXPORT_SYMBOL_GPL(nfs_commit_free); 1041da177e4SLinus Torvalds 1051e7f3a48SWeston Andros Adamson static struct nfs_pgio_header *nfs_writehdr_alloc(void) 1063feb2d49STrond Myklebust { 1072b17d725STrond Myklebust struct nfs_pgio_header *p = mempool_alloc(nfs_wdata_mempool, GFP_KERNEL); 1083feb2d49STrond Myklebust 1093feb2d49STrond Myklebust memset(p, 0, sizeof(*p)); 110fbe77c30SBenjamin Coddington p->rw_mode = FMODE_WRITE; 1113feb2d49STrond Myklebust return p; 1123feb2d49STrond Myklebust } 1133feb2d49STrond Myklebust 1141e7f3a48SWeston Andros Adamson static void nfs_writehdr_free(struct nfs_pgio_header *hdr) 1156c75dc0dSFred Isaman { 1161e7f3a48SWeston Andros Adamson mempool_free(hdr, nfs_wdata_mempool); 1173feb2d49STrond Myklebust } 1181da177e4SLinus Torvalds 119919e3bd9STrond Myklebust static struct nfs_io_completion *nfs_io_completion_alloc(gfp_t gfp_flags) 120919e3bd9STrond Myklebust { 121919e3bd9STrond Myklebust return kmalloc(sizeof(struct nfs_io_completion), gfp_flags); 122919e3bd9STrond Myklebust } 123919e3bd9STrond Myklebust 124919e3bd9STrond Myklebust static void nfs_io_completion_init(struct nfs_io_completion *ioc, 125919e3bd9STrond Myklebust void (*complete)(void *), void *data) 126919e3bd9STrond Myklebust { 127919e3bd9STrond Myklebust ioc->complete = complete; 128919e3bd9STrond Myklebust ioc->data = data; 129919e3bd9STrond Myklebust kref_init(&ioc->refcount); 130919e3bd9STrond Myklebust } 131919e3bd9STrond Myklebust 132919e3bd9STrond Myklebust static void nfs_io_completion_release(struct kref *kref) 133919e3bd9STrond Myklebust { 134919e3bd9STrond Myklebust struct nfs_io_completion *ioc = container_of(kref, 135919e3bd9STrond Myklebust struct nfs_io_completion, refcount); 136919e3bd9STrond Myklebust ioc->complete(ioc->data); 137919e3bd9STrond Myklebust kfree(ioc); 138919e3bd9STrond Myklebust } 139919e3bd9STrond Myklebust 140919e3bd9STrond Myklebust static void nfs_io_completion_get(struct nfs_io_completion *ioc) 141919e3bd9STrond Myklebust { 142919e3bd9STrond Myklebust if (ioc != NULL) 143919e3bd9STrond Myklebust kref_get(&ioc->refcount); 144919e3bd9STrond Myklebust } 145919e3bd9STrond Myklebust 146919e3bd9STrond Myklebust static void nfs_io_completion_put(struct nfs_io_completion *ioc) 147919e3bd9STrond Myklebust { 148919e3bd9STrond Myklebust if (ioc != NULL) 149919e3bd9STrond Myklebust kref_put(&ioc->refcount, nfs_io_completion_release); 150919e3bd9STrond Myklebust } 151919e3bd9STrond Myklebust 152e00ed89dSTrond Myklebust static void 153e00ed89dSTrond Myklebust nfs_page_set_inode_ref(struct nfs_page *req, struct inode *inode) 154e00ed89dSTrond Myklebust { 155e00ed89dSTrond Myklebust if (!test_and_set_bit(PG_INODE_REF, &req->wb_flags)) { 156e00ed89dSTrond Myklebust kref_get(&req->wb_kref); 157e00ed89dSTrond Myklebust atomic_long_inc(&NFS_I(inode)->nrequests); 158e00ed89dSTrond Myklebust } 159e00ed89dSTrond Myklebust } 160e00ed89dSTrond Myklebust 161e00ed89dSTrond Myklebust static int 162e00ed89dSTrond Myklebust nfs_cancel_remove_inode(struct nfs_page *req, struct inode *inode) 163e00ed89dSTrond Myklebust { 164e00ed89dSTrond Myklebust int ret; 165e00ed89dSTrond Myklebust 166e00ed89dSTrond Myklebust if (!test_bit(PG_REMOVE, &req->wb_flags)) 167e00ed89dSTrond Myklebust return 0; 168e00ed89dSTrond Myklebust ret = nfs_page_group_lock(req); 169e00ed89dSTrond Myklebust if (ret) 170e00ed89dSTrond Myklebust return ret; 171e00ed89dSTrond Myklebust if (test_and_clear_bit(PG_REMOVE, &req->wb_flags)) 172e00ed89dSTrond Myklebust nfs_page_set_inode_ref(req, inode); 173e00ed89dSTrond Myklebust nfs_page_group_unlock(req); 174e00ed89dSTrond Myklebust return 0; 175e00ed89dSTrond Myklebust } 176e00ed89dSTrond Myklebust 177bd37d6fcSTrond Myklebust static struct nfs_page * 178bd37d6fcSTrond Myklebust nfs_page_private_request(struct page *page) 179bd37d6fcSTrond Myklebust { 180bd37d6fcSTrond Myklebust if (!PagePrivate(page)) 181bd37d6fcSTrond Myklebust return NULL; 182bd37d6fcSTrond Myklebust return (struct nfs_page *)page_private(page); 183bd37d6fcSTrond Myklebust } 184bd37d6fcSTrond Myklebust 18584d3a9a9SWeston Andros Adamson /* 18684d3a9a9SWeston Andros Adamson * nfs_page_find_head_request_locked - find head request associated with @page 18784d3a9a9SWeston Andros Adamson * 18884d3a9a9SWeston Andros Adamson * must be called while holding the inode lock. 18984d3a9a9SWeston Andros Adamson * 19084d3a9a9SWeston Andros Adamson * returns matching head request with reference held, or NULL if not found. 19184d3a9a9SWeston Andros Adamson */ 19229418aa4SMel Gorman static struct nfs_page * 193b30d2f04STrond Myklebust nfs_page_find_private_request(struct page *page) 194277459d2STrond Myklebust { 1954b9bb25bSTrond Myklebust struct address_space *mapping = page_file_mapping(page); 196bd37d6fcSTrond Myklebust struct nfs_page *req; 197277459d2STrond Myklebust 198b30d2f04STrond Myklebust if (!PagePrivate(page)) 199b30d2f04STrond Myklebust return NULL; 2004b9bb25bSTrond Myklebust spin_lock(&mapping->private_lock); 201bd37d6fcSTrond Myklebust req = nfs_page_private_request(page); 20284d3a9a9SWeston Andros Adamson if (req) { 20384d3a9a9SWeston Andros Adamson WARN_ON_ONCE(req->wb_head != req); 20429418aa4SMel Gorman kref_get(&req->wb_kref); 20584d3a9a9SWeston Andros Adamson } 2064b9bb25bSTrond Myklebust spin_unlock(&mapping->private_lock); 207b30d2f04STrond Myklebust return req; 208b30d2f04STrond Myklebust } 20929418aa4SMel Gorman 210b30d2f04STrond Myklebust static struct nfs_page * 211b30d2f04STrond Myklebust nfs_page_find_swap_request(struct page *page) 212b30d2f04STrond Myklebust { 213b30d2f04STrond Myklebust struct inode *inode = page_file_mapping(page)->host; 214b30d2f04STrond Myklebust struct nfs_inode *nfsi = NFS_I(inode); 215b30d2f04STrond Myklebust struct nfs_page *req = NULL; 216b30d2f04STrond Myklebust if (!PageSwapCache(page)) 217b30d2f04STrond Myklebust return NULL; 218e824f99aSTrond Myklebust mutex_lock(&nfsi->commit_mutex); 219b30d2f04STrond Myklebust if (PageSwapCache(page)) { 220b30d2f04STrond Myklebust req = nfs_page_search_commits_for_head_request_locked(nfsi, 221b30d2f04STrond Myklebust page); 222b30d2f04STrond Myklebust if (req) { 223b30d2f04STrond Myklebust WARN_ON_ONCE(req->wb_head != req); 224b30d2f04STrond Myklebust kref_get(&req->wb_kref); 225b30d2f04STrond Myklebust } 226b30d2f04STrond Myklebust } 227e824f99aSTrond Myklebust mutex_unlock(&nfsi->commit_mutex); 228277459d2STrond Myklebust return req; 229277459d2STrond Myklebust } 230277459d2STrond Myklebust 23184d3a9a9SWeston Andros Adamson /* 23284d3a9a9SWeston Andros Adamson * nfs_page_find_head_request - find head request associated with @page 23384d3a9a9SWeston Andros Adamson * 23484d3a9a9SWeston Andros Adamson * returns matching head request with reference held, or NULL if not found. 23584d3a9a9SWeston Andros Adamson */ 23684d3a9a9SWeston Andros Adamson static struct nfs_page *nfs_page_find_head_request(struct page *page) 237277459d2STrond Myklebust { 238b30d2f04STrond Myklebust struct nfs_page *req; 239277459d2STrond Myklebust 240b30d2f04STrond Myklebust req = nfs_page_find_private_request(page); 241b30d2f04STrond Myklebust if (!req) 242b30d2f04STrond Myklebust req = nfs_page_find_swap_request(page); 243277459d2STrond Myklebust return req; 244277459d2STrond Myklebust } 245277459d2STrond Myklebust 246e00ed89dSTrond Myklebust static struct nfs_page *nfs_find_and_lock_page_request(struct page *page) 247e00ed89dSTrond Myklebust { 248e00ed89dSTrond Myklebust struct inode *inode = page_file_mapping(page)->host; 249e00ed89dSTrond Myklebust struct nfs_page *req, *head; 250e00ed89dSTrond Myklebust int ret; 251e00ed89dSTrond Myklebust 252e00ed89dSTrond Myklebust for (;;) { 253e00ed89dSTrond Myklebust req = nfs_page_find_head_request(page); 254e00ed89dSTrond Myklebust if (!req) 255e00ed89dSTrond Myklebust return req; 256e00ed89dSTrond Myklebust head = nfs_page_group_lock_head(req); 257e00ed89dSTrond Myklebust if (head != req) 258e00ed89dSTrond Myklebust nfs_release_request(req); 259e00ed89dSTrond Myklebust if (IS_ERR(head)) 260e00ed89dSTrond Myklebust return head; 261e00ed89dSTrond Myklebust ret = nfs_cancel_remove_inode(head, inode); 262e00ed89dSTrond Myklebust if (ret < 0) { 263e00ed89dSTrond Myklebust nfs_unlock_and_release_request(head); 264e00ed89dSTrond Myklebust return ERR_PTR(ret); 265e00ed89dSTrond Myklebust } 266e00ed89dSTrond Myklebust /* Ensure that nobody removed the request before we locked it */ 267e00ed89dSTrond Myklebust if (head == nfs_page_private_request(page)) 268e00ed89dSTrond Myklebust break; 269e00ed89dSTrond Myklebust if (PageSwapCache(page)) 270e00ed89dSTrond Myklebust break; 271e00ed89dSTrond Myklebust nfs_unlock_and_release_request(head); 272e00ed89dSTrond Myklebust } 273e00ed89dSTrond Myklebust return head; 274e00ed89dSTrond Myklebust } 275e00ed89dSTrond Myklebust 2761da177e4SLinus Torvalds /* Adjust the file length if we're writing beyond the end */ 2771da177e4SLinus Torvalds static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int count) 2781da177e4SLinus Torvalds { 279d56b4ddfSMel Gorman struct inode *inode = page_file_mapping(page)->host; 280a3d01454STrond Myklebust loff_t end, i_size; 281a3d01454STrond Myklebust pgoff_t end_index; 2821da177e4SLinus Torvalds 283a3d01454STrond Myklebust spin_lock(&inode->i_lock); 284a3d01454STrond Myklebust i_size = i_size_read(inode); 28509cbfeafSKirill A. Shutemov end_index = (i_size - 1) >> PAGE_SHIFT; 2868cd79788SHuang Ying if (i_size > 0 && page_index(page) < end_index) 287a3d01454STrond Myklebust goto out; 288d56b4ddfSMel Gorman end = page_file_offset(page) + ((loff_t)offset+count); 2891da177e4SLinus Torvalds if (i_size >= end) 290a3d01454STrond Myklebust goto out; 291110cb2d2SChuck Lever trace_nfs_size_grow(inode, end); 2921da177e4SLinus Torvalds i_size_write(inode, end); 293f6cdfa6dSTrond Myklebust NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_SIZE; 294a3d01454STrond Myklebust nfs_inc_stats(inode, NFSIOS_EXTENDWRITE); 295a3d01454STrond Myklebust out: 296a3d01454STrond Myklebust spin_unlock(&inode->i_lock); 297a6b5a28eSDave Wysochanski nfs_fscache_invalidate(inode, 0); 2981da177e4SLinus Torvalds } 2991da177e4SLinus Torvalds 300a301b777STrond Myklebust /* A writeback failed: mark the page as bad, and invalidate the page cache */ 301d2ceb7e5SBenjamin Coddington static void nfs_set_pageerror(struct address_space *mapping) 302a301b777STrond Myklebust { 3030df68cedSTrond Myklebust struct inode *inode = mapping->host; 3040df68cedSTrond Myklebust 305d2ceb7e5SBenjamin Coddington nfs_zap_mapping(mapping->host, mapping); 3060df68cedSTrond Myklebust /* Force file size revalidation */ 3070df68cedSTrond Myklebust spin_lock(&inode->i_lock); 308ac46b3d7STrond Myklebust nfs_set_cache_invalid(inode, NFS_INO_REVAL_FORCED | 3090df68cedSTrond Myklebust NFS_INO_REVAL_PAGECACHE | 310ac46b3d7STrond Myklebust NFS_INO_INVALID_SIZE); 3110df68cedSTrond Myklebust spin_unlock(&inode->i_lock); 312a301b777STrond Myklebust } 313a301b777STrond Myklebust 3146fbda89bSTrond Myklebust static void nfs_mapping_set_error(struct page *page, int error) 3156fbda89bSTrond Myklebust { 316b8946d7bSTrond Myklebust struct address_space *mapping = page_file_mapping(page); 317b8946d7bSTrond Myklebust 3186fbda89bSTrond Myklebust SetPageError(page); 319b8946d7bSTrond Myklebust mapping_set_error(mapping, error); 320b8946d7bSTrond Myklebust nfs_set_pageerror(mapping); 3216fbda89bSTrond Myklebust } 3226fbda89bSTrond Myklebust 323d72ddcbaSWeston Andros Adamson /* 324d72ddcbaSWeston Andros Adamson * nfs_page_group_search_locked 325d72ddcbaSWeston Andros Adamson * @head - head request of page group 326d72ddcbaSWeston Andros Adamson * @page_offset - offset into page 327d72ddcbaSWeston Andros Adamson * 328d72ddcbaSWeston Andros Adamson * Search page group with head @head to find a request that contains the 329d72ddcbaSWeston Andros Adamson * page offset @page_offset. 330d72ddcbaSWeston Andros Adamson * 331d72ddcbaSWeston Andros Adamson * Returns a pointer to the first matching nfs request, or NULL if no 332d72ddcbaSWeston Andros Adamson * match is found. 333d72ddcbaSWeston Andros Adamson * 334d72ddcbaSWeston Andros Adamson * Must be called with the page group lock held 335d72ddcbaSWeston Andros Adamson */ 336d72ddcbaSWeston Andros Adamson static struct nfs_page * 337d72ddcbaSWeston Andros Adamson nfs_page_group_search_locked(struct nfs_page *head, unsigned int page_offset) 338d72ddcbaSWeston Andros Adamson { 339d72ddcbaSWeston Andros Adamson struct nfs_page *req; 340d72ddcbaSWeston Andros Adamson 341d72ddcbaSWeston Andros Adamson req = head; 342d72ddcbaSWeston Andros Adamson do { 343d72ddcbaSWeston Andros Adamson if (page_offset >= req->wb_pgbase && 344d72ddcbaSWeston Andros Adamson page_offset < (req->wb_pgbase + req->wb_bytes)) 345d72ddcbaSWeston Andros Adamson return req; 346d72ddcbaSWeston Andros Adamson 347d72ddcbaSWeston Andros Adamson req = req->wb_this_page; 348d72ddcbaSWeston Andros Adamson } while (req != head); 349d72ddcbaSWeston Andros Adamson 350d72ddcbaSWeston Andros Adamson return NULL; 351d72ddcbaSWeston Andros Adamson } 352d72ddcbaSWeston Andros Adamson 353d72ddcbaSWeston Andros Adamson /* 354d72ddcbaSWeston Andros Adamson * nfs_page_group_covers_page 355d72ddcbaSWeston Andros Adamson * @head - head request of page group 356d72ddcbaSWeston Andros Adamson * 357d72ddcbaSWeston Andros Adamson * Return true if the page group with head @head covers the whole page, 358d72ddcbaSWeston Andros Adamson * returns false otherwise 359d72ddcbaSWeston Andros Adamson */ 360d72ddcbaSWeston Andros Adamson static bool nfs_page_group_covers_page(struct nfs_page *req) 361d72ddcbaSWeston Andros Adamson { 362d72ddcbaSWeston Andros Adamson struct nfs_page *tmp; 363d72ddcbaSWeston Andros Adamson unsigned int pos = 0; 364d72ddcbaSWeston Andros Adamson unsigned int len = nfs_page_length(req->wb_page); 365d72ddcbaSWeston Andros Adamson 3661344b7eaSTrond Myklebust nfs_page_group_lock(req); 367d72ddcbaSWeston Andros Adamson 3687e8a30f8STrond Myklebust for (;;) { 369d72ddcbaSWeston Andros Adamson tmp = nfs_page_group_search_locked(req->wb_head, pos); 3707e8a30f8STrond Myklebust if (!tmp) 3717e8a30f8STrond Myklebust break; 3727e8a30f8STrond Myklebust pos = tmp->wb_pgbase + tmp->wb_bytes; 373d72ddcbaSWeston Andros Adamson } 374d72ddcbaSWeston Andros Adamson 375d72ddcbaSWeston Andros Adamson nfs_page_group_unlock(req); 3767e8a30f8STrond Myklebust return pos >= len; 377d72ddcbaSWeston Andros Adamson } 378d72ddcbaSWeston Andros Adamson 3791da177e4SLinus Torvalds /* We can set the PG_uptodate flag if we see that a write request 3801da177e4SLinus Torvalds * covers the full page. 3811da177e4SLinus Torvalds */ 382d72ddcbaSWeston Andros Adamson static void nfs_mark_uptodate(struct nfs_page *req) 3831da177e4SLinus Torvalds { 384d72ddcbaSWeston Andros Adamson if (PageUptodate(req->wb_page)) 3851da177e4SLinus Torvalds return; 386d72ddcbaSWeston Andros Adamson if (!nfs_page_group_covers_page(req)) 3871da177e4SLinus Torvalds return; 388d72ddcbaSWeston Andros Adamson SetPageUptodate(req->wb_page); 3891da177e4SLinus Torvalds } 3901da177e4SLinus Torvalds 3911da177e4SLinus Torvalds static int wb_priority(struct writeback_control *wbc) 3921da177e4SLinus Torvalds { 393e87b4c7aSNeilBrown int ret = 0; 394cca588d6STrond Myklebust 395e87b4c7aSNeilBrown if (wbc->sync_mode == WB_SYNC_ALL) 396e87b4c7aSNeilBrown ret = FLUSH_COND_STABLE; 397e87b4c7aSNeilBrown return ret; 3981da177e4SLinus Torvalds } 3991da177e4SLinus Torvalds 4001da177e4SLinus Torvalds /* 40189a09141SPeter Zijlstra * NFS congestion control 40289a09141SPeter Zijlstra */ 40389a09141SPeter Zijlstra 40489a09141SPeter Zijlstra int nfs_congestion_kb; 40589a09141SPeter Zijlstra 40689a09141SPeter Zijlstra #define NFS_CONGESTION_ON_THRESH (nfs_congestion_kb >> (PAGE_SHIFT-10)) 40789a09141SPeter Zijlstra #define NFS_CONGESTION_OFF_THRESH \ 40889a09141SPeter Zijlstra (NFS_CONGESTION_ON_THRESH - (NFS_CONGESTION_ON_THRESH >> 2)) 40989a09141SPeter Zijlstra 410deed85e7STrond Myklebust static void nfs_set_page_writeback(struct page *page) 41189a09141SPeter Zijlstra { 4120db10944SJan Kara struct inode *inode = page_file_mapping(page)->host; 4130db10944SJan Kara struct nfs_server *nfss = NFS_SERVER(inode); 4145a6d41b3STrond Myklebust int ret = test_set_page_writeback(page); 4155a6d41b3STrond Myklebust 416deed85e7STrond Myklebust WARN_ON_ONCE(ret != 0); 41789a09141SPeter Zijlstra 418277866a0SPeter Zijlstra if (atomic_long_inc_return(&nfss->writeback) > 4190db10944SJan Kara NFS_CONGESTION_ON_THRESH) 420*6df25e58SNeilBrown nfss->write_congested = 1; 42189a09141SPeter Zijlstra } 42289a09141SPeter Zijlstra 42320633f04SWeston Andros Adamson static void nfs_end_page_writeback(struct nfs_page *req) 42489a09141SPeter Zijlstra { 42520633f04SWeston Andros Adamson struct inode *inode = page_file_mapping(req->wb_page)->host; 42689a09141SPeter Zijlstra struct nfs_server *nfss = NFS_SERVER(inode); 42731a01f09STrond Myklebust bool is_done; 42889a09141SPeter Zijlstra 42931a01f09STrond Myklebust is_done = nfs_page_group_sync_on_bit(req, PG_WB_END); 43031a01f09STrond Myklebust nfs_unlock_request(req); 43131a01f09STrond Myklebust if (!is_done) 43220633f04SWeston Andros Adamson return; 43320633f04SWeston Andros Adamson 43420633f04SWeston Andros Adamson end_page_writeback(req->wb_page); 435c4dc4beeSPeter Zijlstra if (atomic_long_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH) 436*6df25e58SNeilBrown nfss->write_congested = 0; 43789a09141SPeter Zijlstra } 43889a09141SPeter Zijlstra 439d4581383SWeston Andros Adamson /* 440d4581383SWeston Andros Adamson * nfs_destroy_unlinked_subrequests - destroy recently unlinked subrequests 441d4581383SWeston Andros Adamson * 442d4581383SWeston Andros Adamson * @destroy_list - request list (using wb_this_page) terminated by @old_head 443d4581383SWeston Andros Adamson * @old_head - the old head of the list 444d4581383SWeston Andros Adamson * 445d4581383SWeston Andros Adamson * All subrequests must be locked and removed from all lists, so at this point 446d4581383SWeston Andros Adamson * they are only "active" in this function, and possibly in nfs_wait_on_request 447d4581383SWeston Andros Adamson * with a reference held by some other context. 448d4581383SWeston Andros Adamson */ 449d4581383SWeston Andros Adamson static void 450d4581383SWeston Andros Adamson nfs_destroy_unlinked_subrequests(struct nfs_page *destroy_list, 451b66aaa8dSTrond Myklebust struct nfs_page *old_head, 452b66aaa8dSTrond Myklebust struct inode *inode) 453d4581383SWeston Andros Adamson { 454d4581383SWeston Andros Adamson while (destroy_list) { 455d4581383SWeston Andros Adamson struct nfs_page *subreq = destroy_list; 456d4581383SWeston Andros Adamson 457d4581383SWeston Andros Adamson destroy_list = (subreq->wb_this_page == old_head) ? 458d4581383SWeston Andros Adamson NULL : subreq->wb_this_page; 459d4581383SWeston Andros Adamson 46008ca8b21STrond Myklebust /* Note: lock subreq in order to change subreq->wb_head */ 46108ca8b21STrond Myklebust nfs_page_set_headlock(subreq); 462d4581383SWeston Andros Adamson WARN_ON_ONCE(old_head != subreq->wb_head); 463d4581383SWeston Andros Adamson 464d4581383SWeston Andros Adamson /* make sure old group is not used */ 465d4581383SWeston Andros Adamson subreq->wb_this_page = subreq; 46608ca8b21STrond Myklebust subreq->wb_head = subreq; 467d4581383SWeston Andros Adamson 468902a4c00STrond Myklebust clear_bit(PG_REMOVE, &subreq->wb_flags); 469902a4c00STrond Myklebust 4705b2b5187STrond Myklebust /* Note: races with nfs_page_group_destroy() */ 4715b2b5187STrond Myklebust if (!kref_read(&subreq->wb_kref)) { 4725b2b5187STrond Myklebust /* Check if we raced with nfs_page_group_destroy() */ 47308ca8b21STrond Myklebust if (test_and_clear_bit(PG_TEARDOWN, &subreq->wb_flags)) { 47408ca8b21STrond Myklebust nfs_page_clear_headlock(subreq); 4755b2b5187STrond Myklebust nfs_free_request(subreq); 47608ca8b21STrond Myklebust } else 47708ca8b21STrond Myklebust nfs_page_clear_headlock(subreq); 4785b2b5187STrond Myklebust continue; 4795b2b5187STrond Myklebust } 48008ca8b21STrond Myklebust nfs_page_clear_headlock(subreq); 481d4581383SWeston Andros Adamson 482add42de3STrond Myklebust nfs_release_request(old_head); 4835b2b5187STrond Myklebust 484b66aaa8dSTrond Myklebust if (test_and_clear_bit(PG_INODE_REF, &subreq->wb_flags)) { 485d4581383SWeston Andros Adamson nfs_release_request(subreq); 486a6b6d5b8STrond Myklebust atomic_long_dec(&NFS_I(inode)->nrequests); 487d4581383SWeston Andros Adamson } 4885b2b5187STrond Myklebust 4895b2b5187STrond Myklebust /* subreq is now totally disconnected from page group or any 4905b2b5187STrond Myklebust * write / commit lists. last chance to wake any waiters */ 4915b2b5187STrond Myklebust nfs_unlock_and_release_request(subreq); 492d4581383SWeston Andros Adamson } 493d4581383SWeston Andros Adamson } 494d4581383SWeston Andros Adamson 495d4581383SWeston Andros Adamson /* 496e00ed89dSTrond Myklebust * nfs_join_page_group - destroy subrequests of the head req 497e00ed89dSTrond Myklebust * @head: the page used to lookup the "page group" of nfs_page structures 498e00ed89dSTrond Myklebust * @inode: Inode to which the request belongs. 499d4581383SWeston Andros Adamson * 500d4581383SWeston Andros Adamson * This function joins all sub requests to the head request by first 501d4581383SWeston Andros Adamson * locking all requests in the group, cancelling any pending operations 502d4581383SWeston Andros Adamson * and finally updating the head request to cover the whole range covered by 503d4581383SWeston Andros Adamson * the (former) group. All subrequests are removed from any write or commit 504d4581383SWeston Andros Adamson * lists, unlinked from the group and destroyed. 505d4581383SWeston Andros Adamson */ 506ed5d588fSTrond Myklebust void 507e00ed89dSTrond Myklebust nfs_join_page_group(struct nfs_page *head, struct inode *inode) 508d4581383SWeston Andros Adamson { 509e00ed89dSTrond Myklebust struct nfs_page *subreq; 510d4581383SWeston Andros Adamson struct nfs_page *destroy_list = NULL; 511a62f8e3bSTrond Myklebust unsigned int pgbase, off, bytes; 512a62f8e3bSTrond Myklebust 513a62f8e3bSTrond Myklebust pgbase = head->wb_pgbase; 514a62f8e3bSTrond Myklebust bytes = head->wb_bytes; 515a62f8e3bSTrond Myklebust off = head->wb_offset; 516a0e265bcSTrond Myklebust for (subreq = head->wb_this_page; subreq != head; 517a0e265bcSTrond Myklebust subreq = subreq->wb_this_page) { 518a62f8e3bSTrond Myklebust /* Subrequests should always form a contiguous range */ 519a62f8e3bSTrond Myklebust if (pgbase > subreq->wb_pgbase) { 520a62f8e3bSTrond Myklebust off -= pgbase - subreq->wb_pgbase; 521a62f8e3bSTrond Myklebust bytes += pgbase - subreq->wb_pgbase; 522a62f8e3bSTrond Myklebust pgbase = subreq->wb_pgbase; 523a62f8e3bSTrond Myklebust } 524a62f8e3bSTrond Myklebust bytes = max(subreq->wb_pgbase + subreq->wb_bytes 525a62f8e3bSTrond Myklebust - pgbase, bytes); 5261bd5d6d0STrond Myklebust } 5271bd5d6d0STrond Myklebust 528a62f8e3bSTrond Myklebust /* Set the head request's range to cover the former page group */ 529a62f8e3bSTrond Myklebust head->wb_pgbase = pgbase; 530a62f8e3bSTrond Myklebust head->wb_bytes = bytes; 531a62f8e3bSTrond Myklebust head->wb_offset = off; 532d4581383SWeston Andros Adamson 533d4581383SWeston Andros Adamson /* Now that all requests are locked, make sure they aren't on any list. 534d4581383SWeston Andros Adamson * Commit list removal accounting is done after locks are dropped */ 535d4581383SWeston Andros Adamson subreq = head; 536d4581383SWeston Andros Adamson do { 537411a99adSWeston Andros Adamson nfs_clear_request_commit(subreq); 538d4581383SWeston Andros Adamson subreq = subreq->wb_this_page; 539d4581383SWeston Andros Adamson } while (subreq != head); 540d4581383SWeston Andros Adamson 541d4581383SWeston Andros Adamson /* unlink subrequests from head, destroy them later */ 542d4581383SWeston Andros Adamson if (head->wb_this_page != head) { 543d4581383SWeston Andros Adamson /* destroy list will be terminated by head */ 544d4581383SWeston Andros Adamson destroy_list = head->wb_this_page; 545d4581383SWeston Andros Adamson head->wb_this_page = head; 546d4581383SWeston Andros Adamson } 547d4581383SWeston Andros Adamson 548b66aaa8dSTrond Myklebust nfs_destroy_unlinked_subrequests(destroy_list, head, inode); 549b5bab9bfSTrond Myklebust } 550b5bab9bfSTrond Myklebust 551e00ed89dSTrond Myklebust /* 552e00ed89dSTrond Myklebust * nfs_lock_and_join_requests - join all subreqs to the head req 553e00ed89dSTrond Myklebust * @page: the page used to lookup the "page group" of nfs_page structures 554e00ed89dSTrond Myklebust * 555e00ed89dSTrond Myklebust * This function joins all sub requests to the head request by first 556e00ed89dSTrond Myklebust * locking all requests in the group, cancelling any pending operations 557e00ed89dSTrond Myklebust * and finally updating the head request to cover the whole range covered by 558e00ed89dSTrond Myklebust * the (former) group. All subrequests are removed from any write or commit 559e00ed89dSTrond Myklebust * lists, unlinked from the group and destroyed. 560e00ed89dSTrond Myklebust * 561e00ed89dSTrond Myklebust * Returns a locked, referenced pointer to the head request - which after 562e00ed89dSTrond Myklebust * this call is guaranteed to be the only request associated with the page. 563e00ed89dSTrond Myklebust * Returns NULL if no requests are found for @page, or a ERR_PTR if an 564e00ed89dSTrond Myklebust * error was encountered. 565e00ed89dSTrond Myklebust */ 566e00ed89dSTrond Myklebust static struct nfs_page * 567e00ed89dSTrond Myklebust nfs_lock_and_join_requests(struct page *page) 568e00ed89dSTrond Myklebust { 569e00ed89dSTrond Myklebust struct inode *inode = page_file_mapping(page)->host; 570e00ed89dSTrond Myklebust struct nfs_page *head; 571e00ed89dSTrond Myklebust int ret; 572e00ed89dSTrond Myklebust 573e00ed89dSTrond Myklebust /* 574e00ed89dSTrond Myklebust * A reference is taken only on the head request which acts as a 575e00ed89dSTrond Myklebust * reference to the whole page group - the group will not be destroyed 576e00ed89dSTrond Myklebust * until the head reference is released. 577e00ed89dSTrond Myklebust */ 578e00ed89dSTrond Myklebust head = nfs_find_and_lock_page_request(page); 579e00ed89dSTrond Myklebust if (IS_ERR_OR_NULL(head)) 580d4581383SWeston Andros Adamson return head; 5810671d8f1SMarkus Elfring 582e00ed89dSTrond Myklebust /* lock each request in the page group */ 583e00ed89dSTrond Myklebust ret = nfs_page_group_lock_subrequests(head); 584e00ed89dSTrond Myklebust if (ret < 0) { 5850671d8f1SMarkus Elfring nfs_unlock_and_release_request(head); 5860671d8f1SMarkus Elfring return ERR_PTR(ret); 587612c9384STrond Myklebust } 588074cc1deSTrond Myklebust 589e00ed89dSTrond Myklebust nfs_join_page_group(head, inode); 590e00ed89dSTrond Myklebust 591e00ed89dSTrond Myklebust return head; 592e00ed89dSTrond Myklebust } 593e00ed89dSTrond Myklebust 5946fbda89bSTrond Myklebust static void nfs_write_error(struct nfs_page *req, int error) 5950bcbf039SPeng Tao { 596861e1671SChuck Lever trace_nfs_write_error(req, error); 5976fbda89bSTrond Myklebust nfs_mapping_set_error(req->wb_page, error); 59806c9fdf3STrond Myklebust nfs_inode_remove_request(req); 5990bcbf039SPeng Tao nfs_end_page_writeback(req); 6001f84ccdfSFred Isaman nfs_release_request(req); 6010bcbf039SPeng Tao } 6020bcbf039SPeng Tao 603074cc1deSTrond Myklebust /* 604074cc1deSTrond Myklebust * Find an associated nfs write request, and prepare to flush it out 605074cc1deSTrond Myklebust * May return an error if the user signalled nfs_wait_on_request(). 606074cc1deSTrond Myklebust */ 607074cc1deSTrond Myklebust static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio, 6086d17d653STrond Myklebust struct page *page) 609074cc1deSTrond Myklebust { 610074cc1deSTrond Myklebust struct nfs_page *req; 611074cc1deSTrond Myklebust int ret = 0; 612074cc1deSTrond Myklebust 6136d17d653STrond Myklebust req = nfs_lock_and_join_requests(page); 614074cc1deSTrond Myklebust if (!req) 615074cc1deSTrond Myklebust goto out; 616074cc1deSTrond Myklebust ret = PTR_ERR(req); 617074cc1deSTrond Myklebust if (IS_ERR(req)) 618074cc1deSTrond Myklebust goto out; 619074cc1deSTrond Myklebust 620deed85e7STrond Myklebust nfs_set_page_writeback(page); 621deed85e7STrond Myklebust WARN_ON_ONCE(test_bit(PG_CLEAN, &req->wb_flags)); 622074cc1deSTrond Myklebust 623a6598813STrond Myklebust /* If there is a fatal error that covers this write, just exit */ 62496c41455STrond Myklebust ret = pgio->pg_error; 62596c41455STrond Myklebust if (nfs_error_is_fatal_on_server(ret)) 626a6598813STrond Myklebust goto out_launder; 627a6598813STrond Myklebust 62896c41455STrond Myklebust ret = 0; 629f8512ad0SFred Isaman if (!nfs_pageio_add_request(pgio, req)) { 630074cc1deSTrond Myklebust ret = pgio->pg_error; 6310bcbf039SPeng Tao /* 632c373fff7STrond Myklebust * Remove the problematic req upon fatal errors on the server 6330bcbf039SPeng Tao */ 6340bcbf039SPeng Tao if (nfs_error_is_fatal(ret)) { 635c373fff7STrond Myklebust if (nfs_error_is_fatal_on_server(ret)) 636a6598813STrond Myklebust goto out_launder; 6378fc75bedSTrond Myklebust } else 6380bcbf039SPeng Tao ret = -EAGAIN; 6398fc75bedSTrond Myklebust nfs_redirty_request(req); 64096c41455STrond Myklebust pgio->pg_error = 0; 64140f90271STrond Myklebust } else 64240f90271STrond Myklebust nfs_add_stats(page_file_mapping(page)->host, 64340f90271STrond Myklebust NFSIOS_WRITEPAGES, 1); 644074cc1deSTrond Myklebust out: 645074cc1deSTrond Myklebust return ret; 646a6598813STrond Myklebust out_launder: 6476fbda89bSTrond Myklebust nfs_write_error(req, ret); 64814bebe3cSTrond Myklebust return 0; 649e261f51fSTrond Myklebust } 650e261f51fSTrond Myklebust 651d6c843b9SPeng Tao static int nfs_do_writepage(struct page *page, struct writeback_control *wbc, 652c373fff7STrond Myklebust struct nfs_pageio_descriptor *pgio) 653f758c885STrond Myklebust { 654cfb506e1STrond Myklebust int ret; 655f758c885STrond Myklebust 6568cd79788SHuang Ying nfs_pageio_cond_complete(pgio, page_index(page)); 6576d17d653STrond Myklebust ret = nfs_page_async_flush(pgio, page); 658cfb506e1STrond Myklebust if (ret == -EAGAIN) { 659cfb506e1STrond Myklebust redirty_page_for_writepage(wbc, page); 66096c41455STrond Myklebust ret = AOP_WRITEPAGE_ACTIVATE; 661cfb506e1STrond Myklebust } 662cfb506e1STrond Myklebust return ret; 663f758c885STrond Myklebust } 664f758c885STrond Myklebust 665e261f51fSTrond Myklebust /* 6661da177e4SLinus Torvalds * Write an mmapped page to the server. 6671da177e4SLinus Torvalds */ 668d6c843b9SPeng Tao static int nfs_writepage_locked(struct page *page, 669c373fff7STrond Myklebust struct writeback_control *wbc) 6701da177e4SLinus Torvalds { 671f758c885STrond Myklebust struct nfs_pageio_descriptor pgio; 67240f90271STrond Myklebust struct inode *inode = page_file_mapping(page)->host; 673e261f51fSTrond Myklebust int err; 6741da177e4SLinus Torvalds 675*6df25e58SNeilBrown if (wbc->sync_mode == WB_SYNC_NONE && 676*6df25e58SNeilBrown NFS_SERVER(inode)->write_congested) 677*6df25e58SNeilBrown return AOP_WRITEPAGE_ACTIVATE; 678*6df25e58SNeilBrown 67940f90271STrond Myklebust nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE); 680811ed92eSTrond Myklebust nfs_pageio_init_write(&pgio, inode, 0, 681a20c93e3SChristoph Hellwig false, &nfs_async_write_completion_ops); 682c373fff7STrond Myklebust err = nfs_do_writepage(page, wbc, &pgio); 68396c41455STrond Myklebust pgio.pg_error = 0; 684f758c885STrond Myklebust nfs_pageio_complete(&pgio); 685f758c885STrond Myklebust if (err < 0) 6864d770ccfSTrond Myklebust return err; 68796c41455STrond Myklebust if (nfs_error_is_fatal(pgio.pg_error)) 688f758c885STrond Myklebust return pgio.pg_error; 689f758c885STrond Myklebust return 0; 6904d770ccfSTrond Myklebust } 6914d770ccfSTrond Myklebust 6924d770ccfSTrond Myklebust int nfs_writepage(struct page *page, struct writeback_control *wbc) 6934d770ccfSTrond Myklebust { 694f758c885STrond Myklebust int ret; 6954d770ccfSTrond Myklebust 696c373fff7STrond Myklebust ret = nfs_writepage_locked(page, wbc); 69796c41455STrond Myklebust if (ret != AOP_WRITEPAGE_ACTIVATE) 6981da177e4SLinus Torvalds unlock_page(page); 699f758c885STrond Myklebust return ret; 700f758c885STrond Myklebust } 701f758c885STrond Myklebust 702f758c885STrond Myklebust static int nfs_writepages_callback(struct page *page, struct writeback_control *wbc, void *data) 703f758c885STrond Myklebust { 704f758c885STrond Myklebust int ret; 705f758c885STrond Myklebust 706c373fff7STrond Myklebust ret = nfs_do_writepage(page, wbc, data); 70796c41455STrond Myklebust if (ret != AOP_WRITEPAGE_ACTIVATE) 708f758c885STrond Myklebust unlock_page(page); 709f758c885STrond Myklebust return ret; 7101da177e4SLinus Torvalds } 7111da177e4SLinus Torvalds 712919e3bd9STrond Myklebust static void nfs_io_completion_commit(void *inode) 713919e3bd9STrond Myklebust { 714919e3bd9STrond Myklebust nfs_commit_inode(inode, 0); 715919e3bd9STrond Myklebust } 716919e3bd9STrond Myklebust 7171da177e4SLinus Torvalds int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc) 7181da177e4SLinus Torvalds { 7191da177e4SLinus Torvalds struct inode *inode = mapping->host; 720c63c7b05STrond Myklebust struct nfs_pageio_descriptor pgio; 721ed7bcdb3STrond Myklebust struct nfs_io_completion *ioc = NULL; 722ed7bcdb3STrond Myklebust unsigned int mntflags = NFS_SERVER(inode)->flags; 723ed7bcdb3STrond Myklebust int priority = 0; 7241da177e4SLinus Torvalds int err; 7251da177e4SLinus Torvalds 726*6df25e58SNeilBrown if (wbc->sync_mode == WB_SYNC_NONE && 727*6df25e58SNeilBrown NFS_SERVER(inode)->write_congested) 728*6df25e58SNeilBrown return 0; 729*6df25e58SNeilBrown 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 741ed7bcdb3STrond Myklebust nfs_pageio_init_write(&pgio, inode, priority, false, 742a20c93e3SChristoph Hellwig &nfs_async_write_completion_ops); 743919e3bd9STrond Myklebust pgio.pg_io_completion = ioc; 744f758c885STrond Myklebust err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio); 74596c41455STrond Myklebust pgio.pg_error = 0; 746c63c7b05STrond Myklebust nfs_pageio_complete(&pgio); 747919e3bd9STrond Myklebust nfs_io_completion_put(ioc); 74872cb77f4STrond Myklebust 749f758c885STrond Myklebust if (err < 0) 75072cb77f4STrond Myklebust goto out_err; 75172cb77f4STrond Myklebust err = pgio.pg_error; 75296c41455STrond Myklebust if (nfs_error_is_fatal(err)) 75372cb77f4STrond Myklebust goto out_err; 754c63c7b05STrond Myklebust return 0; 75572cb77f4STrond Myklebust out_err: 75672cb77f4STrond Myklebust return err; 7571da177e4SLinus Torvalds } 7581da177e4SLinus Torvalds 7591da177e4SLinus Torvalds /* 7601da177e4SLinus Torvalds * Insert a write request into an inode 7611da177e4SLinus Torvalds */ 762d6d6dc7cSFred Isaman static void nfs_inode_add_request(struct inode *inode, struct nfs_page *req) 7631da177e4SLinus Torvalds { 7644b9bb25bSTrond Myklebust struct address_space *mapping = page_file_mapping(req->wb_page); 7651da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 766e7d39069STrond Myklebust 7672bfc6e56SWeston Andros Adamson WARN_ON_ONCE(req->wb_this_page != req); 7682bfc6e56SWeston Andros Adamson 769e7d39069STrond Myklebust /* Lock the request! */ 7707ad84aa9STrond Myklebust nfs_lock_request(req); 771e7d39069STrond Myklebust 77229418aa4SMel Gorman /* 77329418aa4SMel Gorman * Swap-space should not get truncated. Hence no need to plug the race 77429418aa4SMel Gorman * with invalidate/truncate. 77529418aa4SMel Gorman */ 7764b9bb25bSTrond Myklebust spin_lock(&mapping->private_lock); 77729418aa4SMel Gorman if (likely(!PageSwapCache(req->wb_page))) { 7782df485a7STrond Myklebust set_bit(PG_MAPPED, &req->wb_flags); 779deb7d638STrond Myklebust SetPagePrivate(req->wb_page); 780277459d2STrond Myklebust set_page_private(req->wb_page, (unsigned long)req); 78129418aa4SMel Gorman } 7824b9bb25bSTrond Myklebust spin_unlock(&mapping->private_lock); 783a6b6d5b8STrond Myklebust atomic_long_inc(&nfsi->nrequests); 78417089a29SWeston Andros Adamson /* this a head request for a page group - mark it as having an 785cb1410c7SWeston Andros Adamson * extra reference so sub groups can follow suit. 786cb1410c7SWeston Andros Adamson * This flag also informs pgio layer when to bump nrequests when 787cb1410c7SWeston Andros Adamson * adding subrequests. */ 78817089a29SWeston Andros Adamson WARN_ON(test_and_set_bit(PG_INODE_REF, &req->wb_flags)); 789c03b4024STrond Myklebust kref_get(&req->wb_kref); 7901da177e4SLinus Torvalds } 7911da177e4SLinus Torvalds 7921da177e4SLinus Torvalds /* 79389a09141SPeter Zijlstra * Remove a write request from an inode 7941da177e4SLinus Torvalds */ 7951da177e4SLinus Torvalds static void nfs_inode_remove_request(struct nfs_page *req) 7961da177e4SLinus Torvalds { 7974b9bb25bSTrond Myklebust struct address_space *mapping = page_file_mapping(req->wb_page); 7984b9bb25bSTrond Myklebust struct inode *inode = mapping->host; 7991da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 80020633f04SWeston Andros Adamson struct nfs_page *head; 80120633f04SWeston Andros Adamson 80220633f04SWeston Andros Adamson if (nfs_page_group_sync_on_bit(req, PG_REMOVE)) { 80320633f04SWeston Andros Adamson head = req->wb_head; 8041da177e4SLinus Torvalds 8054b9bb25bSTrond Myklebust spin_lock(&mapping->private_lock); 80667911c8fSAnna Schumaker if (likely(head->wb_page && !PageSwapCache(head->wb_page))) { 80720633f04SWeston Andros Adamson set_page_private(head->wb_page, 0); 80820633f04SWeston Andros Adamson ClearPagePrivate(head->wb_page); 80920633f04SWeston Andros Adamson clear_bit(PG_MAPPED, &head->wb_flags); 81029418aa4SMel Gorman } 8114b9bb25bSTrond Myklebust spin_unlock(&mapping->private_lock); 81220633f04SWeston Andros Adamson } 81317089a29SWeston Andros Adamson 81433ea5aaaSZhangXiaoxu if (test_and_clear_bit(PG_INODE_REF, &req->wb_flags)) { 8151da177e4SLinus Torvalds nfs_release_request(req); 81633ea5aaaSZhangXiaoxu atomic_long_dec(&nfsi->nrequests); 81733ea5aaaSZhangXiaoxu } 8181da177e4SLinus Torvalds } 8191da177e4SLinus Torvalds 82061822ab5STrond Myklebust static void 8216d884e8fSFred nfs_mark_request_dirty(struct nfs_page *req) 82261822ab5STrond Myklebust { 82367911c8fSAnna Schumaker if (req->wb_page) 82461822ab5STrond Myklebust __set_page_dirty_nobuffers(req->wb_page); 82561822ab5STrond Myklebust } 82661822ab5STrond Myklebust 8273a3908c8STrond Myklebust /* 8283a3908c8STrond Myklebust * nfs_page_search_commits_for_head_request_locked 8293a3908c8STrond Myklebust * 8303a3908c8STrond Myklebust * Search through commit lists on @inode for the head request for @page. 8313a3908c8STrond Myklebust * Must be called while holding the inode (which is cinfo) lock. 8323a3908c8STrond Myklebust * 8333a3908c8STrond Myklebust * Returns the head request if found, or NULL if not found. 8343a3908c8STrond Myklebust */ 8353a3908c8STrond Myklebust static struct nfs_page * 8363a3908c8STrond Myklebust nfs_page_search_commits_for_head_request_locked(struct nfs_inode *nfsi, 8373a3908c8STrond Myklebust struct page *page) 8383a3908c8STrond Myklebust { 8393a3908c8STrond Myklebust struct nfs_page *freq, *t; 8403a3908c8STrond Myklebust struct nfs_commit_info cinfo; 8413a3908c8STrond Myklebust struct inode *inode = &nfsi->vfs_inode; 8423a3908c8STrond Myklebust 8433a3908c8STrond Myklebust nfs_init_cinfo_from_inode(&cinfo, inode); 8443a3908c8STrond Myklebust 8453a3908c8STrond Myklebust /* search through pnfs commit lists */ 8463a3908c8STrond Myklebust freq = pnfs_search_commit_reqs(inode, &cinfo, page); 8473a3908c8STrond Myklebust if (freq) 8483a3908c8STrond Myklebust return freq->wb_head; 8493a3908c8STrond Myklebust 8503a3908c8STrond Myklebust /* Linearly search the commit list for the correct request */ 8513a3908c8STrond Myklebust list_for_each_entry_safe(freq, t, &cinfo.mds->list, wb_list) { 8523a3908c8STrond Myklebust if (freq->wb_page == page) 8533a3908c8STrond Myklebust return freq->wb_head; 8543a3908c8STrond Myklebust } 8553a3908c8STrond Myklebust 8563a3908c8STrond Myklebust return NULL; 8573a3908c8STrond Myklebust } 8583a3908c8STrond Myklebust 8598dd37758STrond Myklebust /** 86086d80f97STrond Myklebust * nfs_request_add_commit_list_locked - add request to a commit list 86186d80f97STrond Myklebust * @req: pointer to a struct nfs_page 86286d80f97STrond Myklebust * @dst: commit list head 86386d80f97STrond Myklebust * @cinfo: holds list lock and accounting info 86486d80f97STrond Myklebust * 86586d80f97STrond Myklebust * This sets the PG_CLEAN bit, updates the cinfo count of 86686d80f97STrond Myklebust * number of outstanding requests requiring a commit as well as 86786d80f97STrond Myklebust * the MM page stats. 86886d80f97STrond Myklebust * 869e824f99aSTrond Myklebust * The caller must hold NFS_I(cinfo->inode)->commit_mutex, and the 870e824f99aSTrond Myklebust * nfs_page lock. 87186d80f97STrond Myklebust */ 87286d80f97STrond Myklebust void 87386d80f97STrond Myklebust nfs_request_add_commit_list_locked(struct nfs_page *req, struct list_head *dst, 87486d80f97STrond Myklebust struct nfs_commit_info *cinfo) 87586d80f97STrond Myklebust { 87686d80f97STrond Myklebust set_bit(PG_CLEAN, &req->wb_flags); 87786d80f97STrond Myklebust nfs_list_add_request(req, dst); 8785cb953d4STrond Myklebust atomic_long_inc(&cinfo->mds->ncommit); 87986d80f97STrond Myklebust } 88086d80f97STrond Myklebust EXPORT_SYMBOL_GPL(nfs_request_add_commit_list_locked); 88186d80f97STrond Myklebust 88286d80f97STrond Myklebust /** 8838dd37758STrond Myklebust * nfs_request_add_commit_list - add request to a commit list 8848dd37758STrond Myklebust * @req: pointer to a struct nfs_page 885ea2cf228SFred Isaman * @cinfo: holds list lock and accounting info 8868dd37758STrond Myklebust * 887ea2cf228SFred Isaman * This sets the PG_CLEAN bit, updates the cinfo count of 8888dd37758STrond Myklebust * number of outstanding requests requiring a commit as well as 8898dd37758STrond Myklebust * the MM page stats. 8908dd37758STrond Myklebust * 891ea2cf228SFred Isaman * The caller must _not_ hold the cinfo->lock, but must be 8928dd37758STrond Myklebust * holding the nfs_page lock. 8938dd37758STrond Myklebust */ 8948dd37758STrond Myklebust void 8956272dcc6SAnna Schumaker nfs_request_add_commit_list(struct nfs_page *req, struct nfs_commit_info *cinfo) 8968dd37758STrond Myklebust { 897e824f99aSTrond Myklebust mutex_lock(&NFS_I(cinfo->inode)->commit_mutex); 8986272dcc6SAnna Schumaker nfs_request_add_commit_list_locked(req, &cinfo->mds->list, cinfo); 899e824f99aSTrond Myklebust mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex); 90067911c8fSAnna Schumaker if (req->wb_page) 90186d80f97STrond Myklebust nfs_mark_page_unstable(req->wb_page, cinfo); 9028dd37758STrond Myklebust } 9038dd37758STrond Myklebust EXPORT_SYMBOL_GPL(nfs_request_add_commit_list); 9048dd37758STrond Myklebust 9058dd37758STrond Myklebust /** 9068dd37758STrond Myklebust * nfs_request_remove_commit_list - Remove request from a commit list 9078dd37758STrond Myklebust * @req: pointer to a nfs_page 908ea2cf228SFred Isaman * @cinfo: holds list lock and accounting info 9098dd37758STrond Myklebust * 910ea2cf228SFred Isaman * This clears the PG_CLEAN bit, and updates the cinfo's count of 9118dd37758STrond Myklebust * number of outstanding requests requiring a commit 9128dd37758STrond Myklebust * It does not update the MM page stats. 9138dd37758STrond Myklebust * 914ea2cf228SFred Isaman * The caller _must_ hold the cinfo->lock and the nfs_page lock. 9158dd37758STrond Myklebust */ 9168dd37758STrond Myklebust void 917ea2cf228SFred Isaman nfs_request_remove_commit_list(struct nfs_page *req, 918ea2cf228SFred Isaman struct nfs_commit_info *cinfo) 9198dd37758STrond Myklebust { 9208dd37758STrond Myklebust if (!test_and_clear_bit(PG_CLEAN, &(req)->wb_flags)) 9218dd37758STrond Myklebust return; 9228dd37758STrond Myklebust nfs_list_remove_request(req); 9235cb953d4STrond Myklebust atomic_long_dec(&cinfo->mds->ncommit); 9248dd37758STrond Myklebust } 9258dd37758STrond Myklebust EXPORT_SYMBOL_GPL(nfs_request_remove_commit_list); 9268dd37758STrond Myklebust 927ea2cf228SFred Isaman static void nfs_init_cinfo_from_inode(struct nfs_commit_info *cinfo, 928ea2cf228SFred Isaman struct inode *inode) 929ea2cf228SFred Isaman { 930fe238e60SDave Wysochanski cinfo->inode = inode; 931ea2cf228SFred Isaman cinfo->mds = &NFS_I(inode)->commit_info; 932ea2cf228SFred Isaman cinfo->ds = pnfs_get_ds_info(inode); 933b359f9d0SFred Isaman cinfo->dreq = NULL; 934f453a54aSFred Isaman cinfo->completion_ops = &nfs_commit_completion_ops; 935ea2cf228SFred Isaman } 936ea2cf228SFred Isaman 937ea2cf228SFred Isaman void nfs_init_cinfo(struct nfs_commit_info *cinfo, 938ea2cf228SFred Isaman struct inode *inode, 939ea2cf228SFred Isaman struct nfs_direct_req *dreq) 940ea2cf228SFred Isaman { 9411763da12SFred Isaman if (dreq) 9421763da12SFred Isaman nfs_init_cinfo_from_dreq(cinfo, dreq); 9431763da12SFred Isaman else 944ea2cf228SFred Isaman nfs_init_cinfo_from_inode(cinfo, inode); 945ea2cf228SFred Isaman } 946ea2cf228SFred Isaman EXPORT_SYMBOL_GPL(nfs_init_cinfo); 9478dd37758STrond Myklebust 9481da177e4SLinus Torvalds /* 9491da177e4SLinus Torvalds * Add a request to the inode's commit list. 9501da177e4SLinus Torvalds */ 9511763da12SFred Isaman void 952ea2cf228SFred Isaman nfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg, 953b57ff130SWeston Andros Adamson struct nfs_commit_info *cinfo, u32 ds_commit_idx) 9541da177e4SLinus Torvalds { 955b57ff130SWeston Andros Adamson if (pnfs_mark_request_commit(req, lseg, cinfo, ds_commit_idx)) 9568dd37758STrond Myklebust return; 9576272dcc6SAnna Schumaker nfs_request_add_commit_list(req, cinfo); 9581da177e4SLinus Torvalds } 9598e821cadSTrond Myklebust 960d6d6dc7cSFred Isaman static void 961d6d6dc7cSFred Isaman nfs_clear_page_commit(struct page *page) 962e468bae9STrond Myklebust { 9638d92890bSNeilBrown dec_node_page_state(page, NR_WRITEBACK); 96493f78d88STejun Heo dec_wb_stat(&inode_to_bdi(page_file_mapping(page)->host)->wb, 9658d92890bSNeilBrown WB_WRITEBACK); 966e468bae9STrond Myklebust } 967d6d6dc7cSFred Isaman 968b5bab9bfSTrond Myklebust /* Called holding the request lock on @req */ 9698dd37758STrond Myklebust static void 970d6d6dc7cSFred Isaman nfs_clear_request_commit(struct nfs_page *req) 971d6d6dc7cSFred Isaman { 9728dd37758STrond Myklebust if (test_bit(PG_CLEAN, &req->wb_flags)) { 9739fcd5960STrond Myklebust struct nfs_open_context *ctx = nfs_req_openctx(req); 9749fcd5960STrond Myklebust struct inode *inode = d_inode(ctx->dentry); 975ea2cf228SFred Isaman struct nfs_commit_info cinfo; 976d6d6dc7cSFred Isaman 977ea2cf228SFred Isaman nfs_init_cinfo_from_inode(&cinfo, inode); 978e824f99aSTrond Myklebust mutex_lock(&NFS_I(inode)->commit_mutex); 979ea2cf228SFred Isaman if (!pnfs_clear_request_commit(req, &cinfo)) { 980ea2cf228SFred Isaman nfs_request_remove_commit_list(req, &cinfo); 981d6d6dc7cSFred Isaman } 982e824f99aSTrond Myklebust mutex_unlock(&NFS_I(inode)->commit_mutex); 9838dd37758STrond Myklebust nfs_clear_page_commit(req->wb_page); 9848dd37758STrond Myklebust } 985e468bae9STrond Myklebust } 986e468bae9STrond Myklebust 987d45f60c6SWeston Andros Adamson int nfs_write_need_commit(struct nfs_pgio_header *hdr) 9888e821cadSTrond Myklebust { 989c65e6254SWeston Andros Adamson if (hdr->verf.committed == NFS_DATA_SYNC) 990d45f60c6SWeston Andros Adamson return hdr->lseg == NULL; 991c65e6254SWeston Andros Adamson return hdr->verf.committed != NFS_FILE_SYNC; 9928e821cadSTrond Myklebust } 9938e821cadSTrond Myklebust 994919e3bd9STrond Myklebust static void nfs_async_write_init(struct nfs_pgio_header *hdr) 995919e3bd9STrond Myklebust { 996919e3bd9STrond Myklebust nfs_io_completion_get(hdr->io_completion); 997919e3bd9STrond Myklebust } 998919e3bd9STrond Myklebust 999061ae2edSFred Isaman static void nfs_write_completion(struct nfs_pgio_header *hdr) 10006c75dc0dSFred Isaman { 1001ea2cf228SFred Isaman struct nfs_commit_info cinfo; 10026c75dc0dSFred Isaman unsigned long bytes = 0; 10036c75dc0dSFred Isaman 10046c75dc0dSFred Isaman if (test_bit(NFS_IOHDR_REDO, &hdr->flags)) 10056c75dc0dSFred Isaman goto out; 1006ea2cf228SFred Isaman nfs_init_cinfo_from_inode(&cinfo, hdr->inode); 10076c75dc0dSFred Isaman while (!list_empty(&hdr->pages)) { 10086c75dc0dSFred Isaman struct nfs_page *req = nfs_list_entry(hdr->pages.next); 10096c75dc0dSFred Isaman 10106c75dc0dSFred Isaman bytes += req->wb_bytes; 10116c75dc0dSFred Isaman nfs_list_remove_request(req); 10126c75dc0dSFred Isaman if (test_bit(NFS_IOHDR_ERROR, &hdr->flags) && 10136c75dc0dSFred Isaman (hdr->good_bytes < bytes)) { 1014861e1671SChuck Lever trace_nfs_comp_error(req, hdr->error); 10156fbda89bSTrond Myklebust nfs_mapping_set_error(req->wb_page, hdr->error); 10166c75dc0dSFred Isaman goto remove_req; 10176c75dc0dSFred Isaman } 1018c65e6254SWeston Andros Adamson if (nfs_write_need_commit(hdr)) { 101933344e0fSTrond Myklebust /* Reset wb_nio, since the write was successful. */ 102033344e0fSTrond Myklebust req->wb_nio = 0; 1021f79d06f5SAnna Schumaker memcpy(&req->wb_verf, &hdr->verf.verifier, sizeof(req->wb_verf)); 1022b57ff130SWeston Andros Adamson nfs_mark_request_commit(req, hdr->lseg, &cinfo, 1023a7d42ddbSWeston Andros Adamson hdr->pgio_mirror_idx); 10246c75dc0dSFred Isaman goto next; 10256c75dc0dSFred Isaman } 10266c75dc0dSFred Isaman remove_req: 10276c75dc0dSFred Isaman nfs_inode_remove_request(req); 10286c75dc0dSFred Isaman next: 102920633f04SWeston Andros Adamson nfs_end_page_writeback(req); 10303aff4ebbSTrond Myklebust nfs_release_request(req); 10316c75dc0dSFred Isaman } 10326c75dc0dSFred Isaman out: 1033919e3bd9STrond Myklebust nfs_io_completion_put(hdr->io_completion); 10346c75dc0dSFred Isaman hdr->release(hdr); 10356c75dc0dSFred Isaman } 10366c75dc0dSFred Isaman 1037ce59515cSAnna Schumaker unsigned long 1038ea2cf228SFred Isaman nfs_reqs_to_commit(struct nfs_commit_info *cinfo) 1039fb8a1f11STrond Myklebust { 10405cb953d4STrond Myklebust return atomic_long_read(&cinfo->mds->ncommit); 1041fb8a1f11STrond Myklebust } 1042fb8a1f11STrond Myklebust 1043e824f99aSTrond Myklebust /* NFS_I(cinfo->inode)->commit_mutex held by caller */ 10441763da12SFred Isaman int 1045ea2cf228SFred Isaman nfs_scan_commit_list(struct list_head *src, struct list_head *dst, 1046ea2cf228SFred Isaman struct nfs_commit_info *cinfo, int max) 1047d6d6dc7cSFred Isaman { 1048137da553STrond Myklebust struct nfs_page *req, *tmp; 1049d6d6dc7cSFred Isaman int ret = 0; 1050d6d6dc7cSFred Isaman 1051137da553STrond Myklebust list_for_each_entry_safe(req, tmp, src, wb_list) { 10527ad84aa9STrond Myklebust kref_get(&req->wb_kref); 10532ce209c4STrond Myklebust if (!nfs_lock_request(req)) { 1054137da553STrond Myklebust nfs_release_request(req); 1055137da553STrond Myklebust continue; 1056137da553STrond Myklebust } 1057ea2cf228SFred Isaman nfs_request_remove_commit_list(req, cinfo); 10585d2a9d9dSTrond Myklebust clear_bit(PG_COMMIT_TO_DS, &req->wb_flags); 10598dd37758STrond Myklebust nfs_list_add_request(req, dst); 1060d6d6dc7cSFred Isaman ret++; 10611763da12SFred Isaman if ((ret == max) && !cinfo->dreq) 1062d6d6dc7cSFred Isaman break; 1063e824f99aSTrond Myklebust cond_resched(); 1064d6d6dc7cSFred Isaman } 1065d6d6dc7cSFred Isaman return ret; 1066d6d6dc7cSFred Isaman } 10675d2a9d9dSTrond Myklebust EXPORT_SYMBOL_GPL(nfs_scan_commit_list); 1068d6d6dc7cSFred Isaman 10691da177e4SLinus Torvalds /* 10701da177e4SLinus Torvalds * nfs_scan_commit - Scan an inode for commit requests 10711da177e4SLinus Torvalds * @inode: NFS inode to scan 1072ea2cf228SFred Isaman * @dst: mds destination list 1073ea2cf228SFred Isaman * @cinfo: mds and ds lists of reqs ready to commit 10741da177e4SLinus Torvalds * 10751da177e4SLinus Torvalds * Moves requests from the inode's 'commit' request list. 10761da177e4SLinus Torvalds * The requests are *not* checked to ensure that they form a contiguous set. 10771da177e4SLinus Torvalds */ 10781763da12SFred Isaman int 1079ea2cf228SFred Isaman nfs_scan_commit(struct inode *inode, struct list_head *dst, 1080ea2cf228SFred Isaman struct nfs_commit_info *cinfo) 10811da177e4SLinus Torvalds { 1082d6d6dc7cSFred Isaman int ret = 0; 1083fb8a1f11STrond Myklebust 10845cb953d4STrond Myklebust if (!atomic_long_read(&cinfo->mds->ncommit)) 10855cb953d4STrond Myklebust return 0; 1086e824f99aSTrond Myklebust mutex_lock(&NFS_I(cinfo->inode)->commit_mutex); 10875cb953d4STrond Myklebust if (atomic_long_read(&cinfo->mds->ncommit) > 0) { 10888dd37758STrond Myklebust const int max = INT_MAX; 1089d6d6dc7cSFred Isaman 1090ea2cf228SFred Isaman ret = nfs_scan_commit_list(&cinfo->mds->list, dst, 1091ea2cf228SFred Isaman cinfo, max); 1092ea2cf228SFred Isaman ret += pnfs_scan_commit_lists(inode, cinfo, max - ret); 1093d6d6dc7cSFred Isaman } 1094e824f99aSTrond Myklebust mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex); 1095ff778d02STrond Myklebust return ret; 10961da177e4SLinus Torvalds } 1097d6d6dc7cSFred Isaman 10981da177e4SLinus Torvalds /* 1099e7d39069STrond Myklebust * Search for an existing write request, and attempt to update 1100e7d39069STrond Myklebust * it to reflect a new dirty region on a given page. 11011da177e4SLinus Torvalds * 1102e7d39069STrond Myklebust * If the attempt fails, then the existing request is flushed out 1103e7d39069STrond Myklebust * to disk. 11041da177e4SLinus Torvalds */ 1105e7d39069STrond Myklebust static struct nfs_page *nfs_try_to_update_request(struct inode *inode, 1106e7d39069STrond Myklebust struct page *page, 1107e7d39069STrond Myklebust unsigned int offset, 1108e7d39069STrond Myklebust unsigned int bytes) 11091da177e4SLinus Torvalds { 1110e7d39069STrond Myklebust struct nfs_page *req; 1111e7d39069STrond Myklebust unsigned int rqend; 1112e7d39069STrond Myklebust unsigned int end; 11131da177e4SLinus Torvalds int error; 1114277459d2STrond Myklebust 1115e7d39069STrond Myklebust end = offset + bytes; 1116e7d39069STrond Myklebust 1117f6032f21STrond Myklebust req = nfs_lock_and_join_requests(page); 1118f6032f21STrond Myklebust if (IS_ERR_OR_NULL(req)) 1119f6032f21STrond Myklebust return req; 11202bfc6e56SWeston Andros Adamson 1121e7d39069STrond Myklebust rqend = req->wb_offset + req->wb_bytes; 1122e7d39069STrond Myklebust /* 1123e7d39069STrond Myklebust * Tell the caller to flush out the request if 1124e7d39069STrond Myklebust * the offsets are non-contiguous. 1125e7d39069STrond Myklebust * Note: nfs_flush_incompatible() will already 1126e7d39069STrond Myklebust * have flushed out requests having wrong owners. 1127e7d39069STrond Myklebust */ 1128f6032f21STrond Myklebust if (offset > rqend || end < req->wb_offset) 1129e7d39069STrond Myklebust goto out_flushme; 1130e7d39069STrond Myklebust 11311da177e4SLinus Torvalds /* Okay, the request matches. Update the region */ 11321da177e4SLinus Torvalds if (offset < req->wb_offset) { 11331da177e4SLinus Torvalds req->wb_offset = offset; 11341da177e4SLinus Torvalds req->wb_pgbase = offset; 11351da177e4SLinus Torvalds } 11361da177e4SLinus Torvalds if (end > rqend) 11371da177e4SLinus Torvalds req->wb_bytes = end - req->wb_offset; 1138e7d39069STrond Myklebust else 1139e7d39069STrond Myklebust req->wb_bytes = rqend - req->wb_offset; 114033344e0fSTrond Myklebust req->wb_nio = 0; 1141e7d39069STrond Myklebust return req; 1142e7d39069STrond Myklebust out_flushme: 1143f6032f21STrond Myklebust /* 1144f6032f21STrond Myklebust * Note: we mark the request dirty here because 1145f6032f21STrond Myklebust * nfs_lock_and_join_requests() cannot preserve 1146f6032f21STrond Myklebust * commit flags, so we have to replay the write. 1147f6032f21STrond Myklebust */ 1148f6032f21STrond Myklebust nfs_mark_request_dirty(req); 1149f6032f21STrond Myklebust nfs_unlock_and_release_request(req); 1150e7d39069STrond Myklebust error = nfs_wb_page(inode, page); 1151f6032f21STrond Myklebust return (error < 0) ? ERR_PTR(error) : NULL; 1152e7d39069STrond Myklebust } 11531da177e4SLinus Torvalds 1154e7d39069STrond Myklebust /* 1155e7d39069STrond Myklebust * Try to update an existing write request, or create one if there is none. 1156e7d39069STrond Myklebust * 1157e7d39069STrond Myklebust * Note: Should always be called with the Page Lock held to prevent races 1158e7d39069STrond Myklebust * if we have to add a new request. Also assumes that the caller has 1159e7d39069STrond Myklebust * already called nfs_flush_incompatible() if necessary. 1160e7d39069STrond Myklebust */ 1161e7d39069STrond Myklebust static struct nfs_page * nfs_setup_write_request(struct nfs_open_context* ctx, 1162e7d39069STrond Myklebust struct page *page, unsigned int offset, unsigned int bytes) 1163e7d39069STrond Myklebust { 1164d56b4ddfSMel Gorman struct inode *inode = page_file_mapping(page)->host; 1165e7d39069STrond Myklebust struct nfs_page *req; 1166e7d39069STrond Myklebust 1167e7d39069STrond Myklebust req = nfs_try_to_update_request(inode, page, offset, bytes); 1168e7d39069STrond Myklebust if (req != NULL) 1169e7d39069STrond Myklebust goto out; 117028b1d3f5STrond Myklebust req = nfs_create_request(ctx, page, offset, bytes); 1171e7d39069STrond Myklebust if (IS_ERR(req)) 1172e7d39069STrond Myklebust goto out; 1173d6d6dc7cSFred Isaman nfs_inode_add_request(inode, req); 1174efc91ed0STrond Myklebust out: 117561e930a9STrond Myklebust return req; 11761da177e4SLinus Torvalds } 11771da177e4SLinus Torvalds 1178e7d39069STrond Myklebust static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page, 1179e7d39069STrond Myklebust unsigned int offset, unsigned int count) 1180e7d39069STrond Myklebust { 1181e7d39069STrond Myklebust struct nfs_page *req; 1182e7d39069STrond Myklebust 1183e7d39069STrond Myklebust req = nfs_setup_write_request(ctx, page, offset, count); 1184e7d39069STrond Myklebust if (IS_ERR(req)) 1185e7d39069STrond Myklebust return PTR_ERR(req); 1186e7d39069STrond Myklebust /* Update file length */ 1187e7d39069STrond Myklebust nfs_grow_file(page, offset, count); 1188d72ddcbaSWeston Andros Adamson nfs_mark_uptodate(req); 1189a6305ddbSTrond Myklebust nfs_mark_request_dirty(req); 11901d1afcbcSTrond Myklebust nfs_unlock_and_release_request(req); 1191e7d39069STrond Myklebust return 0; 1192e7d39069STrond Myklebust } 1193e7d39069STrond Myklebust 11941da177e4SLinus Torvalds int nfs_flush_incompatible(struct file *file, struct page *page) 11951da177e4SLinus Torvalds { 1196cd3758e3STrond Myklebust struct nfs_open_context *ctx = nfs_file_open_context(file); 11972a369153STrond Myklebust struct nfs_lock_context *l_ctx; 1198bd61e0a9SJeff Layton struct file_lock_context *flctx = file_inode(file)->i_flctx; 11991da177e4SLinus Torvalds struct nfs_page *req; 12001a54533eSTrond Myklebust int do_flush, status; 12011da177e4SLinus Torvalds /* 12021da177e4SLinus Torvalds * Look for a request corresponding to this page. If there 12031da177e4SLinus Torvalds * is one, and it belongs to another file, we flush it out 12041da177e4SLinus Torvalds * before we try to copy anything into the page. Do this 12051da177e4SLinus Torvalds * due to the lack of an ACCESS-type call in NFSv2. 12061da177e4SLinus Torvalds * Also do the same if we find a request from an existing 12071da177e4SLinus Torvalds * dropped page. 12081da177e4SLinus Torvalds */ 12091a54533eSTrond Myklebust do { 121084d3a9a9SWeston Andros Adamson req = nfs_page_find_head_request(page); 12111a54533eSTrond Myklebust if (req == NULL) 12121a54533eSTrond Myklebust return 0; 12132a369153STrond Myklebust l_ctx = req->wb_lock_context; 1214138a2935STrond Myklebust do_flush = req->wb_page != page || 12159fcd5960STrond Myklebust !nfs_match_open_context(nfs_req_openctx(req), ctx); 1216bd61e0a9SJeff Layton if (l_ctx && flctx && 1217bd61e0a9SJeff Layton !(list_empty_careful(&flctx->flc_posix) && 1218bd61e0a9SJeff Layton list_empty_careful(&flctx->flc_flock))) { 1219d51fdb87SNeilBrown do_flush |= l_ctx->lockowner != current->files; 12205263e31eSJeff Layton } 12211da177e4SLinus Torvalds nfs_release_request(req); 12221a54533eSTrond Myklebust if (!do_flush) 12231a54533eSTrond Myklebust return 0; 1224d56b4ddfSMel Gorman status = nfs_wb_page(page_file_mapping(page)->host, page); 12251a54533eSTrond Myklebust } while (status == 0); 12261a54533eSTrond Myklebust return status; 12271da177e4SLinus Torvalds } 12281da177e4SLinus Torvalds 12291da177e4SLinus Torvalds /* 1230dc24826bSAndy Adamson * Avoid buffered writes when a open context credential's key would 1231dc24826bSAndy Adamson * expire soon. 1232dc24826bSAndy Adamson * 1233dc24826bSAndy Adamson * Returns -EACCES if the key will expire within RPC_KEY_EXPIRE_FAIL. 1234dc24826bSAndy Adamson * 1235dc24826bSAndy Adamson * Return 0 and set a credential flag which triggers the inode to flush 1236dc24826bSAndy Adamson * and performs NFS_FILE_SYNC writes if the key will expired within 1237dc24826bSAndy Adamson * RPC_KEY_EXPIRE_TIMEO. 1238dc24826bSAndy Adamson */ 1239dc24826bSAndy Adamson int 1240dc24826bSAndy Adamson nfs_key_timeout_notify(struct file *filp, struct inode *inode) 1241dc24826bSAndy Adamson { 1242dc24826bSAndy Adamson struct nfs_open_context *ctx = nfs_file_open_context(filp); 1243dc24826bSAndy Adamson 1244ddf529eeSNeilBrown if (nfs_ctx_key_to_expire(ctx, inode) && 1245ca05cbaeSTrond Myklebust !rcu_access_pointer(ctx->ll_cred)) 1246ddf529eeSNeilBrown /* Already expired! */ 1247ddf529eeSNeilBrown return -EACCES; 1248ddf529eeSNeilBrown return 0; 1249dc24826bSAndy Adamson } 1250dc24826bSAndy Adamson 1251dc24826bSAndy Adamson /* 1252dc24826bSAndy Adamson * Test if the open context credential key is marked to expire soon. 1253dc24826bSAndy Adamson */ 1254ce52914eSScott Mayhew bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx, struct inode *inode) 1255dc24826bSAndy Adamson { 1256ce52914eSScott Mayhew struct rpc_auth *auth = NFS_SERVER(inode)->client->cl_auth; 1257ca05cbaeSTrond Myklebust struct rpc_cred *cred, *new, *old = NULL; 1258ddf529eeSNeilBrown struct auth_cred acred = { 1259a52458b4SNeilBrown .cred = ctx->cred, 1260ddf529eeSNeilBrown }; 1261ca05cbaeSTrond Myklebust bool ret = false; 1262ce52914eSScott Mayhew 1263ca05cbaeSTrond Myklebust rcu_read_lock(); 1264ca05cbaeSTrond Myklebust cred = rcu_dereference(ctx->ll_cred); 1265ca05cbaeSTrond Myklebust if (cred && !(cred->cr_ops->crkey_timeout && 1266ca05cbaeSTrond Myklebust cred->cr_ops->crkey_timeout(cred))) 1267ca05cbaeSTrond Myklebust goto out; 1268ca05cbaeSTrond Myklebust rcu_read_unlock(); 1269ca05cbaeSTrond Myklebust 1270ca05cbaeSTrond Myklebust new = auth->au_ops->lookup_cred(auth, &acred, 0); 1271ca05cbaeSTrond Myklebust if (new == cred) { 1272ca05cbaeSTrond Myklebust put_rpccred(new); 1273ddf529eeSNeilBrown return true; 1274ca05cbaeSTrond Myklebust } 1275ca05cbaeSTrond Myklebust if (IS_ERR_OR_NULL(new)) { 1276ca05cbaeSTrond Myklebust new = NULL; 1277ca05cbaeSTrond Myklebust ret = true; 1278ca05cbaeSTrond Myklebust } else if (new->cr_ops->crkey_timeout && 1279ca05cbaeSTrond Myklebust new->cr_ops->crkey_timeout(new)) 1280ca05cbaeSTrond Myklebust ret = true; 1281ca05cbaeSTrond Myklebust 1282ca05cbaeSTrond Myklebust rcu_read_lock(); 1283ca05cbaeSTrond Myklebust old = rcu_dereference_protected(xchg(&ctx->ll_cred, 1284ca05cbaeSTrond Myklebust RCU_INITIALIZER(new)), 1); 1285ca05cbaeSTrond Myklebust out: 1286ca05cbaeSTrond Myklebust rcu_read_unlock(); 1287ca05cbaeSTrond Myklebust put_rpccred(old); 1288ca05cbaeSTrond Myklebust return ret; 1289dc24826bSAndy Adamson } 1290dc24826bSAndy Adamson 1291dc24826bSAndy Adamson /* 12925d47a356STrond Myklebust * If the page cache is marked as unsafe or invalid, then we can't rely on 12935d47a356STrond Myklebust * the PageUptodate() flag. In this case, we will need to turn off 12945d47a356STrond Myklebust * write optimisations that depend on the page contents being correct. 12955d47a356STrond Myklebust */ 1296fc9dc401STrond Myklebust static bool nfs_write_pageuptodate(struct page *page, struct inode *inode, 1297fc9dc401STrond Myklebust unsigned int pagelen) 12985d47a356STrond Myklebust { 1299d529ef83SJeff Layton struct nfs_inode *nfsi = NFS_I(inode); 1300d529ef83SJeff Layton 13018d197a56STrond Myklebust if (nfs_have_delegated_attributes(inode)) 13028d197a56STrond Myklebust goto out; 1303fc9dc401STrond Myklebust if (nfsi->cache_validity & 130413c0b082STrond Myklebust (NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_SIZE)) 1305d529ef83SJeff Layton return false; 13064db72b40SJeff Layton smp_rmb(); 1307fc9dc401STrond Myklebust if (test_bit(NFS_INO_INVALIDATING, &nfsi->flags) && pagelen != 0) 13088d197a56STrond Myklebust return false; 13098d197a56STrond Myklebust out: 1310fc9dc401STrond Myklebust if (nfsi->cache_validity & NFS_INO_INVALID_DATA && pagelen != 0) 131118dd78c4SScott Mayhew return false; 13128d197a56STrond Myklebust return PageUptodate(page) != 0; 13135d47a356STrond Myklebust } 13145d47a356STrond Myklebust 13155263e31eSJeff Layton static bool 13165263e31eSJeff Layton is_whole_file_wrlock(struct file_lock *fl) 13175263e31eSJeff Layton { 13185263e31eSJeff Layton return fl->fl_start == 0 && fl->fl_end == OFFSET_MAX && 13195263e31eSJeff Layton fl->fl_type == F_WRLCK; 13205263e31eSJeff Layton } 13215263e31eSJeff Layton 1322c7559663SScott Mayhew /* If we know the page is up to date, and we're not using byte range locks (or 1323c7559663SScott Mayhew * if we have the whole file locked for writing), it may be more efficient to 1324c7559663SScott Mayhew * extend the write to cover the entire page in order to avoid fragmentation 1325c7559663SScott Mayhew * inefficiencies. 1326c7559663SScott Mayhew * 1327263b4509SScott Mayhew * If the file is opened for synchronous writes then we can just skip the rest 1328263b4509SScott Mayhew * of the checks. 1329c7559663SScott Mayhew */ 1330fc9dc401STrond Myklebust static int nfs_can_extend_write(struct file *file, struct page *page, 1331fc9dc401STrond Myklebust struct inode *inode, unsigned int pagelen) 1332c7559663SScott Mayhew { 13335263e31eSJeff Layton int ret; 13345263e31eSJeff Layton struct file_lock_context *flctx = inode->i_flctx; 13355263e31eSJeff Layton struct file_lock *fl; 13365263e31eSJeff Layton 1337c7559663SScott Mayhew if (file->f_flags & O_DSYNC) 1338c7559663SScott Mayhew return 0; 1339fc9dc401STrond Myklebust if (!nfs_write_pageuptodate(page, inode, pagelen)) 1340263b4509SScott Mayhew return 0; 1341c7559663SScott Mayhew if (NFS_PROTO(inode)->have_delegation(inode, FMODE_WRITE)) 1342c7559663SScott Mayhew return 1; 1343bd61e0a9SJeff Layton if (!flctx || (list_empty_careful(&flctx->flc_flock) && 1344bd61e0a9SJeff Layton list_empty_careful(&flctx->flc_posix))) 13458fa4592aSTrond Myklebust return 1; 13465263e31eSJeff Layton 13475263e31eSJeff Layton /* Check to see if there are whole file write locks */ 13485263e31eSJeff Layton ret = 0; 13496109c850SJeff Layton spin_lock(&flctx->flc_lock); 1350bd61e0a9SJeff Layton if (!list_empty(&flctx->flc_posix)) { 1351bd61e0a9SJeff Layton fl = list_first_entry(&flctx->flc_posix, struct file_lock, 1352bd61e0a9SJeff Layton fl_list); 1353bd61e0a9SJeff Layton if (is_whole_file_wrlock(fl)) 13545263e31eSJeff Layton ret = 1; 1355bd61e0a9SJeff Layton } else if (!list_empty(&flctx->flc_flock)) { 13565263e31eSJeff Layton fl = list_first_entry(&flctx->flc_flock, struct file_lock, 13575263e31eSJeff Layton fl_list); 13585263e31eSJeff Layton if (fl->fl_type == F_WRLCK) 13595263e31eSJeff Layton ret = 1; 13605263e31eSJeff Layton } 13616109c850SJeff Layton spin_unlock(&flctx->flc_lock); 13625263e31eSJeff Layton return ret; 1363c7559663SScott Mayhew } 1364c7559663SScott Mayhew 13655d47a356STrond Myklebust /* 13661da177e4SLinus Torvalds * Update and possibly write a cached page of an NFS file. 13671da177e4SLinus Torvalds * 13681da177e4SLinus Torvalds * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad 13691da177e4SLinus Torvalds * things with a page scheduled for an RPC call (e.g. invalidate it). 13701da177e4SLinus Torvalds */ 13711da177e4SLinus Torvalds int nfs_updatepage(struct file *file, struct page *page, 13721da177e4SLinus Torvalds unsigned int offset, unsigned int count) 13731da177e4SLinus Torvalds { 1374cd3758e3STrond Myklebust struct nfs_open_context *ctx = nfs_file_open_context(file); 1375d2ceb7e5SBenjamin Coddington struct address_space *mapping = page_file_mapping(page); 1376d2ceb7e5SBenjamin Coddington struct inode *inode = mapping->host; 1377fc9dc401STrond Myklebust unsigned int pagelen = nfs_page_length(page); 13781da177e4SLinus Torvalds int status = 0; 13791da177e4SLinus Torvalds 138091d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE); 138191d5b470SChuck Lever 13826de1472fSAl Viro dprintk("NFS: nfs_updatepage(%pD2 %d@%lld)\n", 13836de1472fSAl Viro file, count, (long long)(page_file_offset(page) + offset)); 13841da177e4SLinus Torvalds 1385149a4fddSBenjamin Coddington if (!count) 1386149a4fddSBenjamin Coddington goto out; 1387149a4fddSBenjamin Coddington 1388fc9dc401STrond Myklebust if (nfs_can_extend_write(file, page, inode, pagelen)) { 1389fc9dc401STrond Myklebust count = max(count + offset, pagelen); 13901da177e4SLinus Torvalds offset = 0; 13911da177e4SLinus Torvalds } 13921da177e4SLinus Torvalds 1393e21195a7STrond Myklebust status = nfs_writepage_setup(ctx, page, offset, count); 139403fa9e84STrond Myklebust if (status < 0) 1395d2ceb7e5SBenjamin Coddington nfs_set_pageerror(mapping); 1396149a4fddSBenjamin Coddington out: 139748186c7dSChuck Lever dprintk("NFS: nfs_updatepage returns %d (isize %lld)\n", 13981da177e4SLinus Torvalds status, (long long)i_size_read(inode)); 13991da177e4SLinus Torvalds return status; 14001da177e4SLinus Torvalds } 14011da177e4SLinus Torvalds 14023ff7576dSTrond Myklebust static int flush_task_priority(int how) 14031da177e4SLinus Torvalds { 14041da177e4SLinus Torvalds switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) { 14051da177e4SLinus Torvalds case FLUSH_HIGHPRI: 14061da177e4SLinus Torvalds return RPC_PRIORITY_HIGH; 14071da177e4SLinus Torvalds case FLUSH_LOWPRI: 14081da177e4SLinus Torvalds return RPC_PRIORITY_LOW; 14091da177e4SLinus Torvalds } 14101da177e4SLinus Torvalds return RPC_PRIORITY_NORMAL; 14111da177e4SLinus Torvalds } 14121da177e4SLinus Torvalds 1413d45f60c6SWeston Andros Adamson static void nfs_initiate_write(struct nfs_pgio_header *hdr, 1414d45f60c6SWeston Andros Adamson struct rpc_message *msg, 1415abde71f4STom Haynes const struct nfs_rpc_ops *rpc_ops, 14161ed26f33SAnna Schumaker struct rpc_task_setup *task_setup_data, int how) 14171da177e4SLinus Torvalds { 14183ff7576dSTrond Myklebust int priority = flush_task_priority(how); 14191da177e4SLinus Torvalds 14201ed26f33SAnna Schumaker task_setup_data->priority = priority; 1421fb91fb0eSAnna Schumaker rpc_ops->write_setup(hdr, msg, &task_setup_data->rpc_client); 14225bb2a7cbSTrond Myklebust trace_nfs_initiate_write(hdr); 1423275acaafSTrond Myklebust } 1424275acaafSTrond Myklebust 14256d884e8fSFred /* If a nfs_flush_* function fails, it should remove reqs from @head and 14266d884e8fSFred * call this on each, which will prepare them to be retried on next 14276d884e8fSFred * writeback using standard nfs. 14286d884e8fSFred */ 14296d884e8fSFred static void nfs_redirty_request(struct nfs_page *req) 14306d884e8fSFred { 143133344e0fSTrond Myklebust /* Bump the transmission count */ 143233344e0fSTrond Myklebust req->wb_nio++; 14336d884e8fSFred nfs_mark_request_dirty(req); 14349fcd5960STrond Myklebust set_bit(NFS_CONTEXT_RESEND_WRITES, &nfs_req_openctx(req)->flags); 143520633f04SWeston Andros Adamson nfs_end_page_writeback(req); 14363aff4ebbSTrond Myklebust nfs_release_request(req); 14376d884e8fSFred } 14386d884e8fSFred 1439df3accb8STrond Myklebust static void nfs_async_write_error(struct list_head *head, int error) 14406c75dc0dSFred Isaman { 14416c75dc0dSFred Isaman struct nfs_page *req; 14426c75dc0dSFred Isaman 14436c75dc0dSFred Isaman while (!list_empty(head)) { 14446c75dc0dSFred Isaman req = nfs_list_entry(head->next); 14456c75dc0dSFred Isaman nfs_list_remove_request(req); 14466fbda89bSTrond Myklebust if (nfs_error_is_fatal(error)) 14476fbda89bSTrond Myklebust nfs_write_error(req, error); 14486fbda89bSTrond Myklebust else 14496c75dc0dSFred Isaman nfs_redirty_request(req); 14506c75dc0dSFred Isaman } 14516c75dc0dSFred Isaman } 14526c75dc0dSFred Isaman 1453dc602dd7STrond Myklebust static void nfs_async_write_reschedule_io(struct nfs_pgio_header *hdr) 1454dc602dd7STrond Myklebust { 1455df3accb8STrond Myklebust nfs_async_write_error(&hdr->pages, 0); 14567be7b3caSTrond Myklebust filemap_fdatawrite_range(hdr->inode->i_mapping, hdr->args.offset, 14577be7b3caSTrond Myklebust hdr->args.offset + hdr->args.count - 1); 1458dc602dd7STrond Myklebust } 1459dc602dd7STrond Myklebust 1460061ae2edSFred Isaman static const struct nfs_pgio_completion_ops nfs_async_write_completion_ops = { 1461919e3bd9STrond Myklebust .init_hdr = nfs_async_write_init, 1462061ae2edSFred Isaman .error_cleanup = nfs_async_write_error, 1463061ae2edSFred Isaman .completion = nfs_write_completion, 1464dc602dd7STrond Myklebust .reschedule_io = nfs_async_write_reschedule_io, 1465061ae2edSFred Isaman }; 1466061ae2edSFred Isaman 146757208fa7SBryan Schumaker void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, 1468a20c93e3SChristoph Hellwig struct inode *inode, int ioflags, bool force_mds, 1469061ae2edSFred Isaman const struct nfs_pgio_completion_ops *compl_ops) 14701751c363STrond Myklebust { 1471a20c93e3SChristoph Hellwig struct nfs_server *server = NFS_SERVER(inode); 147241d8d5b7SAnna Schumaker const struct nfs_pageio_ops *pg_ops = &nfs_pgio_rw_ops; 1473a20c93e3SChristoph Hellwig 1474a20c93e3SChristoph Hellwig #ifdef CONFIG_NFS_V4_1 1475a20c93e3SChristoph Hellwig if (server->pnfs_curr_ld && !force_mds) 1476a20c93e3SChristoph Hellwig pg_ops = server->pnfs_curr_ld->pg_write_ops; 1477a20c93e3SChristoph Hellwig #endif 14784a0de55cSAnna Schumaker nfs_pageio_init(pgio, inode, pg_ops, compl_ops, &nfs_rw_write_ops, 14793bde7afdSTrond Myklebust server->wsize, ioflags); 14801751c363STrond Myklebust } 1481ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_pageio_init_write); 14821751c363STrond Myklebust 1483dce81290STrond Myklebust void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio) 1484dce81290STrond Myklebust { 1485a7d42ddbSWeston Andros Adamson struct nfs_pgio_mirror *mirror; 1486a7d42ddbSWeston Andros Adamson 14876f29b9bbSKinglong Mee if (pgio->pg_ops && pgio->pg_ops->pg_cleanup) 14886f29b9bbSKinglong Mee pgio->pg_ops->pg_cleanup(pgio); 14896f29b9bbSKinglong Mee 149041d8d5b7SAnna Schumaker pgio->pg_ops = &nfs_pgio_rw_ops; 1491a7d42ddbSWeston Andros Adamson 1492a7d42ddbSWeston Andros Adamson nfs_pageio_stop_mirroring(pgio); 1493a7d42ddbSWeston Andros Adamson 1494a7d42ddbSWeston Andros Adamson mirror = &pgio->pg_mirrors[0]; 1495a7d42ddbSWeston Andros Adamson mirror->pg_bsize = NFS_SERVER(pgio->pg_inode)->wsize; 1496dce81290STrond Myklebust } 14971f945357STrond Myklebust EXPORT_SYMBOL_GPL(nfs_pageio_reset_write_mds); 1498dce81290STrond Myklebust 14991da177e4SLinus Torvalds 15000b7c0153SFred Isaman void nfs_commit_prepare(struct rpc_task *task, void *calldata) 15010b7c0153SFred Isaman { 15020b7c0153SFred Isaman struct nfs_commit_data *data = calldata; 15030b7c0153SFred Isaman 15040b7c0153SFred Isaman NFS_PROTO(data->inode)->commit_rpc_prepare(task, data); 15050b7c0153SFred Isaman } 15060b7c0153SFred Isaman 15071f2edbe3STrond Myklebust /* 15081f2edbe3STrond Myklebust * Special version of should_remove_suid() that ignores capabilities. 15091f2edbe3STrond Myklebust */ 15101f2edbe3STrond Myklebust static int nfs_should_remove_suid(const struct inode *inode) 15111f2edbe3STrond Myklebust { 15121f2edbe3STrond Myklebust umode_t mode = inode->i_mode; 15131f2edbe3STrond Myklebust int kill = 0; 1514788e7a89STrond Myklebust 15151f2edbe3STrond Myklebust /* suid always must be killed */ 15161f2edbe3STrond Myklebust if (unlikely(mode & S_ISUID)) 15171f2edbe3STrond Myklebust kill = ATTR_KILL_SUID; 15181f2edbe3STrond Myklebust 15191f2edbe3STrond Myklebust /* 15201f2edbe3STrond Myklebust * sgid without any exec bits is just a mandatory locking mark; leave 15211f2edbe3STrond Myklebust * it alone. If some exec bits are set, it's a real sgid; kill it. 15221f2edbe3STrond Myklebust */ 15231f2edbe3STrond Myklebust if (unlikely((mode & S_ISGID) && (mode & S_IXGRP))) 15241f2edbe3STrond Myklebust kill |= ATTR_KILL_SGID; 15251f2edbe3STrond Myklebust 15261f2edbe3STrond Myklebust if (unlikely(kill && S_ISREG(mode))) 15271f2edbe3STrond Myklebust return kill; 15281f2edbe3STrond Myklebust 15291f2edbe3STrond Myklebust return 0; 15301f2edbe3STrond Myklebust } 1531788e7a89STrond Myklebust 1532a08a8cd3STrond Myklebust static void nfs_writeback_check_extend(struct nfs_pgio_header *hdr, 1533a08a8cd3STrond Myklebust struct nfs_fattr *fattr) 1534a08a8cd3STrond Myklebust { 1535a08a8cd3STrond Myklebust struct nfs_pgio_args *argp = &hdr->args; 1536a08a8cd3STrond Myklebust struct nfs_pgio_res *resp = &hdr->res; 15372b83d3deSTrond Myklebust u64 size = argp->offset + resp->count; 1538a08a8cd3STrond Myklebust 1539a08a8cd3STrond Myklebust if (!(fattr->valid & NFS_ATTR_FATTR_SIZE)) 15402b83d3deSTrond Myklebust fattr->size = size; 15412b83d3deSTrond Myklebust if (nfs_size_to_loff_t(fattr->size) < i_size_read(hdr->inode)) { 15422b83d3deSTrond Myklebust fattr->valid &= ~NFS_ATTR_FATTR_SIZE; 1543a08a8cd3STrond Myklebust return; 15442b83d3deSTrond Myklebust } 15452b83d3deSTrond Myklebust if (size != fattr->size) 1546a08a8cd3STrond Myklebust return; 1547a08a8cd3STrond Myklebust /* Set attribute barrier */ 1548a08a8cd3STrond Myklebust nfs_fattr_set_barrier(fattr); 15492b83d3deSTrond Myklebust /* ...and update size */ 15502b83d3deSTrond Myklebust fattr->valid |= NFS_ATTR_FATTR_SIZE; 1551a08a8cd3STrond Myklebust } 1552a08a8cd3STrond Myklebust 1553a08a8cd3STrond Myklebust void nfs_writeback_update_inode(struct nfs_pgio_header *hdr) 1554a08a8cd3STrond Myklebust { 15552b83d3deSTrond Myklebust struct nfs_fattr *fattr = &hdr->fattr; 1556a08a8cd3STrond Myklebust struct inode *inode = hdr->inode; 1557a08a8cd3STrond Myklebust 1558a08a8cd3STrond Myklebust spin_lock(&inode->i_lock); 1559a08a8cd3STrond Myklebust nfs_writeback_check_extend(hdr, fattr); 1560a08a8cd3STrond Myklebust nfs_post_op_update_inode_force_wcc_locked(inode, fattr); 1561a08a8cd3STrond Myklebust spin_unlock(&inode->i_lock); 1562a08a8cd3STrond Myklebust } 1563a08a8cd3STrond Myklebust EXPORT_SYMBOL_GPL(nfs_writeback_update_inode); 1564a08a8cd3STrond Myklebust 15651da177e4SLinus Torvalds /* 15661da177e4SLinus Torvalds * This function is called when the WRITE call is complete. 15671da177e4SLinus Torvalds */ 1568d45f60c6SWeston Andros Adamson static int nfs_writeback_done(struct rpc_task *task, 1569d45f60c6SWeston Andros Adamson struct nfs_pgio_header *hdr, 15700eecb214SAnna Schumaker struct inode *inode) 15711da177e4SLinus Torvalds { 1572788e7a89STrond Myklebust int status; 15731da177e4SLinus Torvalds 1574f551e44fSChuck Lever /* 1575f551e44fSChuck Lever * ->write_done will attempt to use post-op attributes to detect 1576f551e44fSChuck Lever * conflicting writes by other clients. A strict interpretation 1577f551e44fSChuck Lever * of close-to-open would allow us to continue caching even if 1578f551e44fSChuck Lever * another writer had changed the file, but some applications 1579f551e44fSChuck Lever * depend on tighter cache coherency when writing. 1580f551e44fSChuck Lever */ 1581d45f60c6SWeston Andros Adamson status = NFS_PROTO(inode)->write_done(task, hdr); 1582788e7a89STrond Myklebust if (status != 0) 15830eecb214SAnna Schumaker return status; 15848224b273SChuck Lever 1585d45f60c6SWeston Andros Adamson nfs_add_stats(inode, NFSIOS_SERVERWRITTENBYTES, hdr->res.count); 15865bb2a7cbSTrond Myklebust trace_nfs_writeback_done(task, hdr); 158791d5b470SChuck Lever 1588d45f60c6SWeston Andros Adamson if (hdr->res.verf->committed < hdr->args.stable && 1589d45f60c6SWeston Andros Adamson task->tk_status >= 0) { 15901da177e4SLinus Torvalds /* We tried a write call, but the server did not 15911da177e4SLinus Torvalds * commit data to stable storage even though we 15921da177e4SLinus Torvalds * requested it. 15931da177e4SLinus Torvalds * Note: There is a known bug in Tru64 < 5.0 in which 15941da177e4SLinus Torvalds * the server reports NFS_DATA_SYNC, but performs 15951da177e4SLinus Torvalds * NFS_FILE_SYNC. We therefore implement this checking 15961da177e4SLinus Torvalds * as a dprintk() in order to avoid filling syslog. 15971da177e4SLinus Torvalds */ 15981da177e4SLinus Torvalds static unsigned long complain; 15991da177e4SLinus Torvalds 1600a69aef14SFred Isaman /* Note this will print the MDS for a DS write */ 16011da177e4SLinus Torvalds if (time_before(complain, jiffies)) { 16021da177e4SLinus Torvalds dprintk("NFS: faulty NFS server %s:" 16031da177e4SLinus Torvalds " (committed = %d) != (stable = %d)\n", 1604cd841605SFred Isaman NFS_SERVER(inode)->nfs_client->cl_hostname, 1605d45f60c6SWeston Andros Adamson hdr->res.verf->committed, hdr->args.stable); 16061da177e4SLinus Torvalds complain = jiffies + 300 * HZ; 16071da177e4SLinus Torvalds } 16081da177e4SLinus Torvalds } 16091f2edbe3STrond Myklebust 16101f2edbe3STrond Myklebust /* Deal with the suid/sgid bit corner case */ 161116e14375STrond Myklebust if (nfs_should_remove_suid(inode)) { 161216e14375STrond Myklebust spin_lock(&inode->i_lock); 1613720869ebSTrond Myklebust nfs_set_cache_invalid(inode, NFS_INO_INVALID_MODE); 161416e14375STrond Myklebust spin_unlock(&inode->i_lock); 161516e14375STrond Myklebust } 16160eecb214SAnna Schumaker return 0; 16170eecb214SAnna Schumaker } 16180eecb214SAnna Schumaker 16190eecb214SAnna Schumaker /* 16200eecb214SAnna Schumaker * This function is called when the WRITE call is complete. 16210eecb214SAnna Schumaker */ 1622d45f60c6SWeston Andros Adamson static void nfs_writeback_result(struct rpc_task *task, 1623d45f60c6SWeston Andros Adamson struct nfs_pgio_header *hdr) 16240eecb214SAnna Schumaker { 1625d45f60c6SWeston Andros Adamson struct nfs_pgio_args *argp = &hdr->args; 1626d45f60c6SWeston Andros Adamson struct nfs_pgio_res *resp = &hdr->res; 16271f2edbe3STrond Myklebust 16281f2edbe3STrond Myklebust if (resp->count < argp->count) { 16291da177e4SLinus Torvalds static unsigned long complain; 16301da177e4SLinus Torvalds 16316c75dc0dSFred Isaman /* This a short write! */ 1632d45f60c6SWeston Andros Adamson nfs_inc_stats(hdr->inode, NFSIOS_SHORTWRITE); 163391d5b470SChuck Lever 16341da177e4SLinus Torvalds /* Has the server at least made some progress? */ 16356c75dc0dSFred Isaman if (resp->count == 0) { 16366c75dc0dSFred Isaman if (time_before(complain, jiffies)) { 16376c75dc0dSFred Isaman printk(KERN_WARNING 16386c75dc0dSFred Isaman "NFS: Server wrote zero bytes, expected %u.\n", 16396c75dc0dSFred Isaman argp->count); 16406c75dc0dSFred Isaman complain = jiffies + 300 * HZ; 16416c75dc0dSFred Isaman } 1642d45f60c6SWeston Andros Adamson nfs_set_pgio_error(hdr, -EIO, argp->offset); 16436c75dc0dSFred Isaman task->tk_status = -EIO; 16446c75dc0dSFred Isaman return; 16456c75dc0dSFred Isaman } 1646f8417b48SKinglong Mee 1647f8417b48SKinglong Mee /* For non rpc-based layout drivers, retry-through-MDS */ 1648f8417b48SKinglong Mee if (!task->tk_ops) { 1649f8417b48SKinglong Mee hdr->pnfs_error = -EAGAIN; 1650f8417b48SKinglong Mee return; 1651f8417b48SKinglong Mee } 1652f8417b48SKinglong Mee 16531da177e4SLinus Torvalds /* Was this an NFSv2 write or an NFSv3 stable write? */ 16541da177e4SLinus Torvalds if (resp->verf->committed != NFS_UNSTABLE) { 16551da177e4SLinus Torvalds /* Resend from where the server left off */ 1656d45f60c6SWeston Andros Adamson hdr->mds_offset += resp->count; 16571da177e4SLinus Torvalds argp->offset += resp->count; 16581da177e4SLinus Torvalds argp->pgbase += resp->count; 16591da177e4SLinus Torvalds argp->count -= resp->count; 16601da177e4SLinus Torvalds } else { 16611da177e4SLinus Torvalds /* Resend as a stable write in order to avoid 16621da177e4SLinus Torvalds * headaches in the case of a server crash. 16631da177e4SLinus Torvalds */ 16641da177e4SLinus Torvalds argp->stable = NFS_FILE_SYNC; 16651da177e4SLinus Torvalds } 16668c9cb714STrond Myklebust resp->count = 0; 16678c9cb714STrond Myklebust resp->verf->committed = 0; 1668d00c5d43STrond Myklebust rpc_restart_call_prepare(task); 16691da177e4SLinus Torvalds } 16701da177e4SLinus Torvalds } 16711da177e4SLinus Torvalds 1672af7cf057STrond Myklebust static int wait_on_commit(struct nfs_mds_commit_info *cinfo) 167371d0a611STrond Myklebust { 1674723c921eSPeter Zijlstra return wait_var_event_killable(&cinfo->rpcs_out, 1675723c921eSPeter Zijlstra !atomic_read(&cinfo->rpcs_out)); 1676af7cf057STrond Myklebust } 1677af7cf057STrond Myklebust 1678af7cf057STrond Myklebust static void nfs_commit_begin(struct nfs_mds_commit_info *cinfo) 1679af7cf057STrond Myklebust { 1680af7cf057STrond Myklebust atomic_inc(&cinfo->rpcs_out); 1681af7cf057STrond Myklebust } 1682af7cf057STrond Myklebust 1683133a48abSTrond Myklebust bool nfs_commit_end(struct nfs_mds_commit_info *cinfo) 1684af7cf057STrond Myklebust { 1685133a48abSTrond Myklebust if (atomic_dec_and_test(&cinfo->rpcs_out)) { 1686723c921eSPeter Zijlstra wake_up_var(&cinfo->rpcs_out); 1687133a48abSTrond Myklebust return true; 1688133a48abSTrond Myklebust } 1689133a48abSTrond Myklebust return false; 169071d0a611STrond Myklebust } 169171d0a611STrond Myklebust 16920b7c0153SFred Isaman void nfs_commitdata_release(struct nfs_commit_data *data) 16931da177e4SLinus Torvalds { 16940b7c0153SFred Isaman put_nfs_open_context(data->context); 16950b7c0153SFred Isaman nfs_commit_free(data); 16961da177e4SLinus Torvalds } 1697e0c2b380SFred Isaman EXPORT_SYMBOL_GPL(nfs_commitdata_release); 16981da177e4SLinus Torvalds 16990b7c0153SFred Isaman int nfs_initiate_commit(struct rpc_clnt *clnt, struct nfs_commit_data *data, 1700c36aae9aSPeng Tao const struct nfs_rpc_ops *nfs_ops, 17019ace33cdSFred Isaman const struct rpc_call_ops *call_ops, 17029f0ec176SAndy Adamson int how, int flags) 17031da177e4SLinus Torvalds { 170407737691STrond Myklebust struct rpc_task *task; 17059ace33cdSFred Isaman int priority = flush_task_priority(how); 1706bdc7f021STrond Myklebust struct rpc_message msg = { 1707bdc7f021STrond Myklebust .rpc_argp = &data->args, 1708bdc7f021STrond Myklebust .rpc_resp = &data->res, 17099ace33cdSFred Isaman .rpc_cred = data->cred, 1710bdc7f021STrond Myklebust }; 171184115e1cSTrond Myklebust struct rpc_task_setup task_setup_data = { 171207737691STrond Myklebust .task = &data->task, 17139ace33cdSFred Isaman .rpc_client = clnt, 1714bdc7f021STrond Myklebust .rpc_message = &msg, 17159ace33cdSFred Isaman .callback_ops = call_ops, 171684115e1cSTrond Myklebust .callback_data = data, 1717101070caSTrond Myklebust .workqueue = nfsiod_workqueue, 17184fa7ef69STrond Myklebust .flags = RPC_TASK_ASYNC | flags, 17193ff7576dSTrond Myklebust .priority = priority, 172084115e1cSTrond Myklebust }; 1721788e7a89STrond Myklebust /* Set up the initial task struct. */ 1722e9ae1ee2SAnna Schumaker nfs_ops->commit_setup(data, &msg, &task_setup_data.rpc_client); 17238224b273SChuck Lever trace_nfs_initiate_commit(data); 17241da177e4SLinus Torvalds 1725b4839ebeSKinglong Mee dprintk("NFS: initiated commit call\n"); 1726bdc7f021STrond Myklebust 172707737691STrond Myklebust task = rpc_run_task(&task_setup_data); 1728dbae4c73STrond Myklebust if (IS_ERR(task)) 1729dbae4c73STrond Myklebust return PTR_ERR(task); 1730d2224e7aSJeff Layton if (how & FLUSH_SYNC) 1731d2224e7aSJeff Layton rpc_wait_for_completion_task(task); 173207737691STrond Myklebust rpc_put_task(task); 1733dbae4c73STrond Myklebust return 0; 17341da177e4SLinus Torvalds } 1735e0c2b380SFred Isaman EXPORT_SYMBOL_GPL(nfs_initiate_commit); 17361da177e4SLinus Torvalds 1737378520b8SPeng Tao static loff_t nfs_get_lwb(struct list_head *head) 1738378520b8SPeng Tao { 1739378520b8SPeng Tao loff_t lwb = 0; 1740378520b8SPeng Tao struct nfs_page *req; 1741378520b8SPeng Tao 1742378520b8SPeng Tao list_for_each_entry(req, head, wb_list) 1743378520b8SPeng Tao if (lwb < (req_offset(req) + req->wb_bytes)) 1744378520b8SPeng Tao lwb = req_offset(req) + req->wb_bytes; 1745378520b8SPeng Tao 1746378520b8SPeng Tao return lwb; 1747378520b8SPeng Tao } 1748378520b8SPeng Tao 17491da177e4SLinus Torvalds /* 17509ace33cdSFred Isaman * Set up the argument/result storage required for the RPC call. 17519ace33cdSFred Isaman */ 17520b7c0153SFred Isaman void nfs_init_commit(struct nfs_commit_data *data, 1753988b6dceSFred Isaman struct list_head *head, 1754f453a54aSFred Isaman struct pnfs_layout_segment *lseg, 1755f453a54aSFred Isaman struct nfs_commit_info *cinfo) 17569ace33cdSFred Isaman { 175719573c93STrond Myklebust struct nfs_page *first; 175819573c93STrond Myklebust struct nfs_open_context *ctx; 175919573c93STrond Myklebust struct inode *inode; 17609ace33cdSFred Isaman 17619ace33cdSFred Isaman /* Set up the RPC argument and reply structs 17629ace33cdSFred Isaman * NB: take care not to mess about with data->commit et al. */ 17639ace33cdSFred Isaman 176419573c93STrond Myklebust if (head) 17659ace33cdSFred Isaman list_splice_init(head, &data->pages); 17669ace33cdSFred Isaman 176719573c93STrond Myklebust first = nfs_list_entry(data->pages.next); 176819573c93STrond Myklebust ctx = nfs_req_openctx(first); 176919573c93STrond Myklebust inode = d_inode(ctx->dentry); 177019573c93STrond Myklebust 17719ace33cdSFred Isaman data->inode = inode; 17729fcd5960STrond Myklebust data->cred = ctx->cred; 1773988b6dceSFred Isaman data->lseg = lseg; /* reference transferred */ 1774378520b8SPeng Tao /* only set lwb for pnfs commit */ 1775378520b8SPeng Tao if (lseg) 1776378520b8SPeng Tao data->lwb = nfs_get_lwb(&data->pages); 17779ace33cdSFred Isaman data->mds_ops = &nfs_commit_ops; 1778f453a54aSFred Isaman data->completion_ops = cinfo->completion_ops; 1779b359f9d0SFred Isaman data->dreq = cinfo->dreq; 17809ace33cdSFred Isaman 17819ace33cdSFred Isaman data->args.fh = NFS_FH(data->inode); 17829ace33cdSFred Isaman /* Note: we always request a commit of the entire inode */ 17839ace33cdSFred Isaman data->args.offset = 0; 17849ace33cdSFred Isaman data->args.count = 0; 17859fcd5960STrond Myklebust data->context = get_nfs_open_context(ctx); 17869ace33cdSFred Isaman data->res.fattr = &data->fattr; 17879ace33cdSFred Isaman data->res.verf = &data->verf; 17889ace33cdSFred Isaman nfs_fattr_init(&data->fattr); 1789133a48abSTrond Myklebust nfs_commit_begin(cinfo->mds); 17909ace33cdSFred Isaman } 1791e0c2b380SFred Isaman EXPORT_SYMBOL_GPL(nfs_init_commit); 17929ace33cdSFred Isaman 1793e0c2b380SFred Isaman void nfs_retry_commit(struct list_head *page_list, 1794ea2cf228SFred Isaman struct pnfs_layout_segment *lseg, 1795b57ff130SWeston Andros Adamson struct nfs_commit_info *cinfo, 1796b57ff130SWeston Andros Adamson u32 ds_commit_idx) 179764bfeb49SFred Isaman { 179864bfeb49SFred Isaman struct nfs_page *req; 179964bfeb49SFred Isaman 180064bfeb49SFred Isaman while (!list_empty(page_list)) { 180164bfeb49SFred Isaman req = nfs_list_entry(page_list->next); 180264bfeb49SFred Isaman nfs_list_remove_request(req); 1803b57ff130SWeston Andros Adamson nfs_mark_request_commit(req, lseg, cinfo, ds_commit_idx); 1804487b9b8aSTom Haynes if (!cinfo->dreq) 1805487b9b8aSTom Haynes nfs_clear_page_commit(req->wb_page); 18061d1afcbcSTrond Myklebust nfs_unlock_and_release_request(req); 180764bfeb49SFred Isaman } 180864bfeb49SFred Isaman } 1809e0c2b380SFred Isaman EXPORT_SYMBOL_GPL(nfs_retry_commit); 181064bfeb49SFred Isaman 1811b20135d0STrond Myklebust static void 1812b20135d0STrond Myklebust nfs_commit_resched_write(struct nfs_commit_info *cinfo, 1813b20135d0STrond Myklebust struct nfs_page *req) 1814b20135d0STrond Myklebust { 1815b20135d0STrond Myklebust __set_page_dirty_nobuffers(req->wb_page); 1816b20135d0STrond Myklebust } 1817b20135d0STrond Myklebust 18189ace33cdSFred Isaman /* 18191da177e4SLinus Torvalds * Commit dirty pages 18201da177e4SLinus Torvalds */ 18211da177e4SLinus Torvalds static int 1822ea2cf228SFred Isaman nfs_commit_list(struct inode *inode, struct list_head *head, int how, 1823ea2cf228SFred Isaman struct nfs_commit_info *cinfo) 18241da177e4SLinus Torvalds { 18250b7c0153SFred Isaman struct nfs_commit_data *data; 182685e39feeSOlga Kornievskaia unsigned short task_flags = 0; 18271da177e4SLinus Torvalds 1828ade8febdSWeston Andros Adamson /* another commit raced with us */ 1829ade8febdSWeston Andros Adamson if (list_empty(head)) 1830ade8febdSWeston Andros Adamson return 0; 1831ade8febdSWeston Andros Adamson 1832518662e0SNeilBrown data = nfs_commitdata_alloc(true); 18331da177e4SLinus Torvalds 18341da177e4SLinus Torvalds /* Set up the argument struct */ 1835f453a54aSFred Isaman nfs_init_commit(data, head, NULL, cinfo); 183685e39feeSOlga Kornievskaia if (NFS_SERVER(inode)->nfs_client->cl_minorversion) 183785e39feeSOlga Kornievskaia task_flags = RPC_TASK_MOVEABLE; 1838c36aae9aSPeng Tao return nfs_initiate_commit(NFS_CLIENT(inode), data, NFS_PROTO(inode), 183985e39feeSOlga Kornievskaia data->mds_ops, how, 184085e39feeSOlga Kornievskaia RPC_TASK_CRED_NOREF | task_flags); 18411da177e4SLinus Torvalds } 18421da177e4SLinus Torvalds 18431da177e4SLinus Torvalds /* 18441da177e4SLinus Torvalds * COMMIT call returned 18451da177e4SLinus Torvalds */ 1846788e7a89STrond Myklebust static void nfs_commit_done(struct rpc_task *task, void *calldata) 18471da177e4SLinus Torvalds { 18480b7c0153SFred Isaman struct nfs_commit_data *data = calldata; 18491da177e4SLinus Torvalds 1850788e7a89STrond Myklebust /* Call the NFS version-specific code */ 1851c0d0e96bSTrond Myklebust NFS_PROTO(data->inode)->commit_done(task, data); 18527bdd297eSTrond Myklebust trace_nfs_commit_done(task, data); 1853c9d8f89dSTrond Myklebust } 1854c9d8f89dSTrond Myklebust 1855f453a54aSFred Isaman static void nfs_commit_release_pages(struct nfs_commit_data *data) 1856c9d8f89dSTrond Myklebust { 1857221203ceSTrond Myklebust const struct nfs_writeverf *verf = data->res.verf; 1858c9d8f89dSTrond Myklebust struct nfs_page *req; 1859c9d8f89dSTrond Myklebust int status = data->task.tk_status; 1860f453a54aSFred Isaman struct nfs_commit_info cinfo; 1861353db796SNeilBrown struct nfs_server *nfss; 1862788e7a89STrond Myklebust 18631da177e4SLinus Torvalds while (!list_empty(&data->pages)) { 18641da177e4SLinus Torvalds req = nfs_list_entry(data->pages.next); 18651da177e4SLinus Torvalds nfs_list_remove_request(req); 186667911c8fSAnna Schumaker if (req->wb_page) 1867d6d6dc7cSFred Isaman nfs_clear_page_commit(req->wb_page); 18681da177e4SLinus Torvalds 18691e8968c5SNiels de Vos dprintk("NFS: commit (%s/%llu %d@%lld)", 18709fcd5960STrond Myklebust nfs_req_openctx(req)->dentry->d_sb->s_id, 18719fcd5960STrond Myklebust (unsigned long long)NFS_FILEID(d_inode(nfs_req_openctx(req)->dentry)), 18721da177e4SLinus Torvalds req->wb_bytes, 18731da177e4SLinus Torvalds (long long)req_offset(req)); 1874c9d8f89dSTrond Myklebust if (status < 0) { 18756fbda89bSTrond Myklebust if (req->wb_page) { 1876861e1671SChuck Lever trace_nfs_commit_error(req, status); 18776fbda89bSTrond Myklebust nfs_mapping_set_error(req->wb_page, status); 18781da177e4SLinus Torvalds nfs_inode_remove_request(req); 18796fbda89bSTrond Myklebust } 1880ddeaa637SJoe Perches dprintk_cont(", error = %d\n", status); 18811da177e4SLinus Torvalds goto next; 18821da177e4SLinus Torvalds } 18831da177e4SLinus Torvalds 18841da177e4SLinus Torvalds /* Okay, COMMIT succeeded, apparently. Check the verifier 18851da177e4SLinus Torvalds * returned by the server against all stored verfs. */ 18861f28476dSTrond Myklebust if (nfs_write_match_verf(verf, req)) { 18871da177e4SLinus Torvalds /* We have a match */ 188838a33101SKinglong Mee if (req->wb_page) 18891da177e4SLinus Torvalds nfs_inode_remove_request(req); 1890ddeaa637SJoe Perches dprintk_cont(" OK\n"); 18911da177e4SLinus Torvalds goto next; 18921da177e4SLinus Torvalds } 18931da177e4SLinus Torvalds /* We have a mismatch. Write the page again */ 1894ddeaa637SJoe Perches dprintk_cont(" mismatch\n"); 18956d884e8fSFred nfs_mark_request_dirty(req); 18969fcd5960STrond Myklebust set_bit(NFS_CONTEXT_RESEND_WRITES, &nfs_req_openctx(req)->flags); 18971da177e4SLinus Torvalds next: 18981d1afcbcSTrond Myklebust nfs_unlock_and_release_request(req); 18997f1bda44STrond Myklebust /* Latency breaker */ 19007f1bda44STrond Myklebust cond_resched(); 19011da177e4SLinus Torvalds } 1902353db796SNeilBrown nfss = NFS_SERVER(data->inode); 1903353db796SNeilBrown if (atomic_long_read(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH) 1904*6df25e58SNeilBrown nfss->write_congested = 0; 1905353db796SNeilBrown 1906f453a54aSFred Isaman nfs_init_cinfo(&cinfo, data->inode, data->dreq); 1907af7cf057STrond Myklebust nfs_commit_end(cinfo.mds); 19085917ce84SFred Isaman } 19095917ce84SFred Isaman 19105917ce84SFred Isaman static void nfs_commit_release(void *calldata) 19115917ce84SFred Isaman { 19120b7c0153SFred Isaman struct nfs_commit_data *data = calldata; 19135917ce84SFred Isaman 1914f453a54aSFred Isaman data->completion_ops->completion(data); 1915c9d8f89dSTrond Myklebust nfs_commitdata_release(calldata); 19161da177e4SLinus Torvalds } 1917788e7a89STrond Myklebust 1918788e7a89STrond Myklebust static const struct rpc_call_ops nfs_commit_ops = { 19190b7c0153SFred Isaman .rpc_call_prepare = nfs_commit_prepare, 1920788e7a89STrond Myklebust .rpc_call_done = nfs_commit_done, 1921788e7a89STrond Myklebust .rpc_release = nfs_commit_release, 1922788e7a89STrond Myklebust }; 19231da177e4SLinus Torvalds 1924f453a54aSFred Isaman static const struct nfs_commit_completion_ops nfs_commit_completion_ops = { 1925f453a54aSFred Isaman .completion = nfs_commit_release_pages, 1926b20135d0STrond Myklebust .resched_write = nfs_commit_resched_write, 1927f453a54aSFred Isaman }; 1928f453a54aSFred Isaman 19291763da12SFred Isaman int nfs_generic_commit_list(struct inode *inode, struct list_head *head, 1930ea2cf228SFred Isaman int how, struct nfs_commit_info *cinfo) 193184c53ab5SFred Isaman { 193284c53ab5SFred Isaman int status; 193384c53ab5SFred Isaman 1934ea2cf228SFred Isaman status = pnfs_commit_list(inode, head, how, cinfo); 193584c53ab5SFred Isaman if (status == PNFS_NOT_ATTEMPTED) 1936ea2cf228SFred Isaman status = nfs_commit_list(inode, head, how, cinfo); 193784c53ab5SFred Isaman return status; 193884c53ab5SFred Isaman } 193984c53ab5SFred Isaman 1940c4f24df9STrond Myklebust static int __nfs_commit_inode(struct inode *inode, int how, 1941c4f24df9STrond Myklebust struct writeback_control *wbc) 19421da177e4SLinus Torvalds { 19431da177e4SLinus Torvalds LIST_HEAD(head); 1944ea2cf228SFred Isaman struct nfs_commit_info cinfo; 194571d0a611STrond Myklebust int may_wait = how & FLUSH_SYNC; 1946c4f24df9STrond Myklebust int ret, nscan; 19471da177e4SLinus Torvalds 194864a93dbfSTrond Myklebust how &= ~FLUSH_SYNC; 1949ea2cf228SFred Isaman nfs_init_cinfo_from_inode(&cinfo, inode); 1950af7cf057STrond Myklebust nfs_commit_begin(cinfo.mds); 1951c4f24df9STrond Myklebust for (;;) { 1952c4f24df9STrond Myklebust ret = nscan = nfs_scan_commit(inode, &head, &cinfo); 1953c4f24df9STrond Myklebust if (ret <= 0) 1954c4f24df9STrond Myklebust break; 1955c4f24df9STrond Myklebust ret = nfs_generic_commit_list(inode, &head, how, &cinfo); 1956c4f24df9STrond Myklebust if (ret < 0) 1957c4f24df9STrond Myklebust break; 1958c4f24df9STrond Myklebust ret = 0; 1959c4f24df9STrond Myklebust if (wbc && wbc->sync_mode == WB_SYNC_NONE) { 1960c4f24df9STrond Myklebust if (nscan < wbc->nr_to_write) 1961c4f24df9STrond Myklebust wbc->nr_to_write -= nscan; 1962c4f24df9STrond Myklebust else 1963c4f24df9STrond Myklebust wbc->nr_to_write = 0; 1964c4f24df9STrond Myklebust } 1965c4f24df9STrond Myklebust if (nscan < INT_MAX) 1966c4f24df9STrond Myklebust break; 1967c4f24df9STrond Myklebust cond_resched(); 1968c4f24df9STrond Myklebust } 1969af7cf057STrond Myklebust nfs_commit_end(cinfo.mds); 1970c4f24df9STrond Myklebust if (ret || !may_wait) 1971c4f24df9STrond Myklebust return ret; 1972c4f24df9STrond Myklebust return wait_on_commit(cinfo.mds); 1973c4f24df9STrond Myklebust } 1974c4f24df9STrond Myklebust 1975c4f24df9STrond Myklebust int nfs_commit_inode(struct inode *inode, int how) 1976c4f24df9STrond Myklebust { 1977c4f24df9STrond Myklebust return __nfs_commit_inode(inode, how, NULL); 19781da177e4SLinus Torvalds } 1979b20135d0STrond Myklebust EXPORT_SYMBOL_GPL(nfs_commit_inode); 19808fc795f7STrond Myklebust 1981ae09c31fSAnna Schumaker int nfs_write_inode(struct inode *inode, struct writeback_control *wbc) 19828fc795f7STrond Myklebust { 1983420e3646STrond Myklebust struct nfs_inode *nfsi = NFS_I(inode); 1984420e3646STrond Myklebust int flags = FLUSH_SYNC; 1985420e3646STrond Myklebust int ret = 0; 19868fc795f7STrond Myklebust 1987c4f24df9STrond Myklebust if (wbc->sync_mode == WB_SYNC_NONE) { 19883236c3e1SJeff Layton /* no commits means nothing needs to be done */ 19895cb953d4STrond Myklebust if (!atomic_long_read(&nfsi->commit_info.ncommit)) 1990c4f24df9STrond Myklebust goto check_requests_outstanding; 19913236c3e1SJeff Layton 1992a00dd6c0SJeff Layton /* Don't commit yet if this is a non-blocking flush and there 1993a00dd6c0SJeff Layton * are a lot of outstanding writes for this mapping. 1994420e3646STrond Myklebust */ 19951a4edf0fSTrond Myklebust if (mapping_tagged(inode->i_mapping, PAGECACHE_TAG_WRITEBACK)) 1996420e3646STrond Myklebust goto out_mark_dirty; 1997420e3646STrond Myklebust 1998a00dd6c0SJeff Layton /* don't wait for the COMMIT response */ 1999420e3646STrond Myklebust flags = 0; 2000a00dd6c0SJeff Layton } 2001a00dd6c0SJeff Layton 2002c4f24df9STrond Myklebust ret = __nfs_commit_inode(inode, flags, wbc); 2003c4f24df9STrond Myklebust if (!ret) { 2004c4f24df9STrond Myklebust if (flags & FLUSH_SYNC) 20058fc795f7STrond Myklebust return 0; 2006c4f24df9STrond Myklebust } else if (atomic_long_read(&nfsi->commit_info.ncommit)) 2007c4f24df9STrond Myklebust goto out_mark_dirty; 2008c4f24df9STrond Myklebust 2009c4f24df9STrond Myklebust check_requests_outstanding: 2010c4f24df9STrond Myklebust if (!atomic_read(&nfsi->commit_info.rpcs_out)) 2011c4f24df9STrond Myklebust return ret; 2012420e3646STrond Myklebust out_mark_dirty: 20138fc795f7STrond Myklebust __mark_inode_dirty(inode, I_DIRTY_DATASYNC); 20148fc795f7STrond Myklebust return ret; 20158fc795f7STrond Myklebust } 201689d77c8fSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_write_inode); 2017863a3c6cSAndy Adamson 2018acdc53b2STrond Myklebust /* 2019837bb1d7STrond Myklebust * Wrapper for filemap_write_and_wait_range() 2020837bb1d7STrond Myklebust * 2021837bb1d7STrond Myklebust * Needed for pNFS in order to ensure data becomes visible to the 2022837bb1d7STrond Myklebust * client. 2023837bb1d7STrond Myklebust */ 2024837bb1d7STrond Myklebust int nfs_filemap_write_and_wait_range(struct address_space *mapping, 2025837bb1d7STrond Myklebust loff_t lstart, loff_t lend) 2026837bb1d7STrond Myklebust { 2027837bb1d7STrond Myklebust int ret; 2028837bb1d7STrond Myklebust 2029837bb1d7STrond Myklebust ret = filemap_write_and_wait_range(mapping, lstart, lend); 2030837bb1d7STrond Myklebust if (ret == 0) 2031837bb1d7STrond Myklebust ret = pnfs_sync_inode(mapping->host, true); 2032837bb1d7STrond Myklebust return ret; 2033837bb1d7STrond Myklebust } 2034837bb1d7STrond Myklebust EXPORT_SYMBOL_GPL(nfs_filemap_write_and_wait_range); 2035837bb1d7STrond Myklebust 2036837bb1d7STrond Myklebust /* 2037acdc53b2STrond Myklebust * flush the inode to disk. 2038acdc53b2STrond Myklebust */ 2039acdc53b2STrond Myklebust int nfs_wb_all(struct inode *inode) 204034901f70STrond Myklebust { 2041f4ce1299STrond Myklebust int ret; 204234901f70STrond Myklebust 2043f4ce1299STrond Myklebust trace_nfs_writeback_inode_enter(inode); 2044f4ce1299STrond Myklebust 20455bb89b47STrond Myklebust ret = filemap_write_and_wait(inode->i_mapping); 20466b196875SChuck Lever if (ret) 20476b196875SChuck Lever goto out; 20485bb89b47STrond Myklebust ret = nfs_commit_inode(inode, FLUSH_SYNC); 20496b196875SChuck Lever if (ret < 0) 20506b196875SChuck Lever goto out; 20515bb89b47STrond Myklebust pnfs_sync_inode(inode, true); 20526b196875SChuck Lever ret = 0; 2053f4ce1299STrond Myklebust 20546b196875SChuck Lever out: 2055f4ce1299STrond Myklebust trace_nfs_writeback_inode_exit(inode, ret); 2056f4ce1299STrond Myklebust return ret; 20571c75950bSTrond Myklebust } 2058ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_wb_all); 20591c75950bSTrond Myklebust 20601b3b4a1aSTrond Myklebust int nfs_wb_page_cancel(struct inode *inode, struct page *page) 20611b3b4a1aSTrond Myklebust { 20621b3b4a1aSTrond Myklebust struct nfs_page *req; 20631b3b4a1aSTrond Myklebust int ret = 0; 20641b3b4a1aSTrond Myklebust 2065ba8b06e6STrond Myklebust wait_on_page_writeback(page); 20663e217045SWeston Andros Adamson 20673e217045SWeston Andros Adamson /* blocking call to cancel all requests and join to a single (head) 20683e217045SWeston Andros Adamson * request */ 20696d17d653STrond Myklebust req = nfs_lock_and_join_requests(page); 20703e217045SWeston Andros Adamson 20713e217045SWeston Andros Adamson if (IS_ERR(req)) { 20723e217045SWeston Andros Adamson ret = PTR_ERR(req); 20733e217045SWeston Andros Adamson } else if (req) { 20743e217045SWeston Andros Adamson /* all requests from this page have been cancelled by 20753e217045SWeston Andros Adamson * nfs_lock_and_join_requests, so just remove the head 20763e217045SWeston Andros Adamson * request from the inode / page_private pointer and 20773e217045SWeston Andros Adamson * release it */ 20781b3b4a1aSTrond Myklebust nfs_inode_remove_request(req); 20791d1afcbcSTrond Myklebust nfs_unlock_and_release_request(req); 20801b3b4a1aSTrond Myklebust } 20813e217045SWeston Andros Adamson 20821b3b4a1aSTrond Myklebust return ret; 20831b3b4a1aSTrond Myklebust } 20841b3b4a1aSTrond Myklebust 20851c75950bSTrond Myklebust /* 20861c75950bSTrond Myklebust * Write back all requests on one page - we do this before reading it. 20871c75950bSTrond Myklebust */ 2088c373fff7STrond Myklebust int nfs_wb_page(struct inode *inode, struct page *page) 20891c75950bSTrond Myklebust { 209029418aa4SMel Gorman loff_t range_start = page_file_offset(page); 209109cbfeafSKirill A. Shutemov loff_t range_end = range_start + (loff_t)(PAGE_SIZE - 1); 20927f2f12d9STrond Myklebust struct writeback_control wbc = { 20937f2f12d9STrond Myklebust .sync_mode = WB_SYNC_ALL, 20947f2f12d9STrond Myklebust .nr_to_write = 0, 20957f2f12d9STrond Myklebust .range_start = range_start, 20967f2f12d9STrond Myklebust .range_end = range_end, 20977f2f12d9STrond Myklebust }; 20987f2f12d9STrond Myklebust int ret; 20997f2f12d9STrond Myklebust 2100f4ce1299STrond Myklebust trace_nfs_writeback_page_enter(inode); 2101f4ce1299STrond Myklebust 21020522f6adSTrond Myklebust for (;;) { 2103ba8b06e6STrond Myklebust wait_on_page_writeback(page); 21047f2f12d9STrond Myklebust if (clear_page_dirty_for_io(page)) { 2105c373fff7STrond Myklebust ret = nfs_writepage_locked(page, &wbc); 21067f2f12d9STrond Myklebust if (ret < 0) 21077f2f12d9STrond Myklebust goto out_error; 21080522f6adSTrond Myklebust continue; 21097f2f12d9STrond Myklebust } 2110f4ce1299STrond Myklebust ret = 0; 21110522f6adSTrond Myklebust if (!PagePrivate(page)) 21120522f6adSTrond Myklebust break; 21130522f6adSTrond Myklebust ret = nfs_commit_inode(inode, FLUSH_SYNC); 21147f2f12d9STrond Myklebust if (ret < 0) 21157f2f12d9STrond Myklebust goto out_error; 21167f2f12d9STrond Myklebust } 21177f2f12d9STrond Myklebust out_error: 2118f4ce1299STrond Myklebust trace_nfs_writeback_page_exit(inode, ret); 21197f2f12d9STrond Myklebust return ret; 21201c75950bSTrond Myklebust } 21211c75950bSTrond Myklebust 2122074cc1deSTrond Myklebust #ifdef CONFIG_MIGRATION 2123074cc1deSTrond Myklebust int nfs_migrate_page(struct address_space *mapping, struct page *newpage, 2124a6bc32b8SMel Gorman struct page *page, enum migrate_mode mode) 2125074cc1deSTrond Myklebust { 21262da95652SJeff Layton /* 21272da95652SJeff Layton * If PagePrivate is set, then the page is currently associated with 21282da95652SJeff Layton * an in-progress read or write request. Don't try to migrate it. 21292da95652SJeff Layton * 21302da95652SJeff Layton * FIXME: we could do this in principle, but we'll need a way to ensure 21312da95652SJeff Layton * that we can safely release the inode reference while holding 21322da95652SJeff Layton * the page lock. 21332da95652SJeff Layton */ 21342da95652SJeff Layton if (PagePrivate(page)) 21352da95652SJeff Layton return -EBUSY; 2136074cc1deSTrond Myklebust 213716f2f4e6SDavid Howells if (PageFsCache(page)) { 213816f2f4e6SDavid Howells if (mode == MIGRATE_ASYNC) 21398c209ce7SDavid Howells return -EBUSY; 214016f2f4e6SDavid Howells wait_on_page_fscache(page); 214116f2f4e6SDavid Howells } 2142074cc1deSTrond Myklebust 2143a6bc32b8SMel Gorman return migrate_page(mapping, newpage, page, mode); 2144074cc1deSTrond Myklebust } 2145074cc1deSTrond Myklebust #endif 2146074cc1deSTrond Myklebust 2147f7b422b1SDavid Howells int __init nfs_init_writepagecache(void) 21481da177e4SLinus Torvalds { 21491da177e4SLinus Torvalds nfs_wdata_cachep = kmem_cache_create("nfs_write_data", 21501e7f3a48SWeston Andros Adamson sizeof(struct nfs_pgio_header), 21511da177e4SLinus Torvalds 0, SLAB_HWCACHE_ALIGN, 215220c2df83SPaul Mundt NULL); 21531da177e4SLinus Torvalds if (nfs_wdata_cachep == NULL) 21541da177e4SLinus Torvalds return -ENOMEM; 21551da177e4SLinus Torvalds 215693d2341cSMatthew Dobson nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE, 21571da177e4SLinus Torvalds nfs_wdata_cachep); 21581da177e4SLinus Torvalds if (nfs_wdata_mempool == NULL) 21593dd4765fSJeff Layton goto out_destroy_write_cache; 21601da177e4SLinus Torvalds 21610b7c0153SFred Isaman nfs_cdata_cachep = kmem_cache_create("nfs_commit_data", 21620b7c0153SFred Isaman sizeof(struct nfs_commit_data), 21630b7c0153SFred Isaman 0, SLAB_HWCACHE_ALIGN, 21640b7c0153SFred Isaman NULL); 21650b7c0153SFred Isaman if (nfs_cdata_cachep == NULL) 21663dd4765fSJeff Layton goto out_destroy_write_mempool; 21670b7c0153SFred Isaman 216893d2341cSMatthew Dobson nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT, 21694c100210SYanchuan Nian nfs_cdata_cachep); 21701da177e4SLinus Torvalds if (nfs_commit_mempool == NULL) 21713dd4765fSJeff Layton goto out_destroy_commit_cache; 21721da177e4SLinus Torvalds 217389a09141SPeter Zijlstra /* 217489a09141SPeter Zijlstra * NFS congestion size, scale with available memory. 217589a09141SPeter Zijlstra * 217689a09141SPeter Zijlstra * 64MB: 8192k 217789a09141SPeter Zijlstra * 128MB: 11585k 217889a09141SPeter Zijlstra * 256MB: 16384k 217989a09141SPeter Zijlstra * 512MB: 23170k 218089a09141SPeter Zijlstra * 1GB: 32768k 218189a09141SPeter Zijlstra * 2GB: 46340k 218289a09141SPeter Zijlstra * 4GB: 65536k 218389a09141SPeter Zijlstra * 8GB: 92681k 218489a09141SPeter Zijlstra * 16GB: 131072k 218589a09141SPeter Zijlstra * 218689a09141SPeter Zijlstra * This allows larger machines to have larger/more transfers. 218789a09141SPeter Zijlstra * Limit the default to 256M 218889a09141SPeter Zijlstra */ 2189ca79b0c2SArun KS nfs_congestion_kb = (16*int_sqrt(totalram_pages())) << (PAGE_SHIFT-10); 219089a09141SPeter Zijlstra if (nfs_congestion_kb > 256*1024) 219189a09141SPeter Zijlstra nfs_congestion_kb = 256*1024; 219289a09141SPeter Zijlstra 21931da177e4SLinus Torvalds return 0; 21943dd4765fSJeff Layton 21953dd4765fSJeff Layton out_destroy_commit_cache: 21963dd4765fSJeff Layton kmem_cache_destroy(nfs_cdata_cachep); 21973dd4765fSJeff Layton out_destroy_write_mempool: 21983dd4765fSJeff Layton mempool_destroy(nfs_wdata_mempool); 21993dd4765fSJeff Layton out_destroy_write_cache: 22003dd4765fSJeff Layton kmem_cache_destroy(nfs_wdata_cachep); 22013dd4765fSJeff Layton return -ENOMEM; 22021da177e4SLinus Torvalds } 22031da177e4SLinus Torvalds 2204266bee88SDavid Brownell void nfs_destroy_writepagecache(void) 22051da177e4SLinus Torvalds { 22061da177e4SLinus Torvalds mempool_destroy(nfs_commit_mempool); 22073dd4765fSJeff Layton kmem_cache_destroy(nfs_cdata_cachep); 22081da177e4SLinus Torvalds mempool_destroy(nfs_wdata_mempool); 22091a1d92c1SAlexey Dobriyan kmem_cache_destroy(nfs_wdata_cachep); 22101da177e4SLinus Torvalds } 22111da177e4SLinus Torvalds 22124a0de55cSAnna Schumaker static const struct nfs_rw_ops nfs_rw_write_ops = { 22134a0de55cSAnna Schumaker .rw_alloc_header = nfs_writehdr_alloc, 22144a0de55cSAnna Schumaker .rw_free_header = nfs_writehdr_free, 22150eecb214SAnna Schumaker .rw_done = nfs_writeback_done, 22160eecb214SAnna Schumaker .rw_result = nfs_writeback_result, 22171ed26f33SAnna Schumaker .rw_initiate = nfs_initiate_write, 22184a0de55cSAnna Schumaker }; 2219