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; 2911da177e4SLinus Torvalds i_size_write(inode, end); 292f6cdfa6dSTrond Myklebust NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_SIZE; 293a3d01454STrond Myklebust nfs_inc_stats(inode, NFSIOS_EXTENDWRITE); 294a3d01454STrond Myklebust out: 295a3d01454STrond Myklebust spin_unlock(&inode->i_lock); 2961da177e4SLinus Torvalds } 2971da177e4SLinus Torvalds 298a301b777STrond Myklebust /* A writeback failed: mark the page as bad, and invalidate the page cache */ 299d2ceb7e5SBenjamin Coddington static void nfs_set_pageerror(struct address_space *mapping) 300a301b777STrond Myklebust { 3010df68cedSTrond Myklebust struct inode *inode = mapping->host; 3020df68cedSTrond Myklebust 303d2ceb7e5SBenjamin Coddington nfs_zap_mapping(mapping->host, mapping); 3040df68cedSTrond Myklebust /* Force file size revalidation */ 3050df68cedSTrond Myklebust spin_lock(&inode->i_lock); 306*ac46b3d7STrond Myklebust nfs_set_cache_invalid(inode, NFS_INO_REVAL_FORCED | 3070df68cedSTrond Myklebust NFS_INO_REVAL_PAGECACHE | 308*ac46b3d7STrond Myklebust NFS_INO_INVALID_SIZE); 3090df68cedSTrond Myklebust spin_unlock(&inode->i_lock); 310a301b777STrond Myklebust } 311a301b777STrond Myklebust 3126fbda89bSTrond Myklebust static void nfs_mapping_set_error(struct page *page, int error) 3136fbda89bSTrond Myklebust { 314b8946d7bSTrond Myklebust struct address_space *mapping = page_file_mapping(page); 315b8946d7bSTrond Myklebust 3166fbda89bSTrond Myklebust SetPageError(page); 317b8946d7bSTrond Myklebust mapping_set_error(mapping, error); 318b8946d7bSTrond Myklebust nfs_set_pageerror(mapping); 3196fbda89bSTrond Myklebust } 3206fbda89bSTrond Myklebust 321d72ddcbaSWeston Andros Adamson /* 322d72ddcbaSWeston Andros Adamson * nfs_page_group_search_locked 323d72ddcbaSWeston Andros Adamson * @head - head request of page group 324d72ddcbaSWeston Andros Adamson * @page_offset - offset into page 325d72ddcbaSWeston Andros Adamson * 326d72ddcbaSWeston Andros Adamson * Search page group with head @head to find a request that contains the 327d72ddcbaSWeston Andros Adamson * page offset @page_offset. 328d72ddcbaSWeston Andros Adamson * 329d72ddcbaSWeston Andros Adamson * Returns a pointer to the first matching nfs request, or NULL if no 330d72ddcbaSWeston Andros Adamson * match is found. 331d72ddcbaSWeston Andros Adamson * 332d72ddcbaSWeston Andros Adamson * Must be called with the page group lock held 333d72ddcbaSWeston Andros Adamson */ 334d72ddcbaSWeston Andros Adamson static struct nfs_page * 335d72ddcbaSWeston Andros Adamson nfs_page_group_search_locked(struct nfs_page *head, unsigned int page_offset) 336d72ddcbaSWeston Andros Adamson { 337d72ddcbaSWeston Andros Adamson struct nfs_page *req; 338d72ddcbaSWeston Andros Adamson 339d72ddcbaSWeston Andros Adamson req = head; 340d72ddcbaSWeston Andros Adamson do { 341d72ddcbaSWeston Andros Adamson if (page_offset >= req->wb_pgbase && 342d72ddcbaSWeston Andros Adamson page_offset < (req->wb_pgbase + req->wb_bytes)) 343d72ddcbaSWeston Andros Adamson return req; 344d72ddcbaSWeston Andros Adamson 345d72ddcbaSWeston Andros Adamson req = req->wb_this_page; 346d72ddcbaSWeston Andros Adamson } while (req != head); 347d72ddcbaSWeston Andros Adamson 348d72ddcbaSWeston Andros Adamson return NULL; 349d72ddcbaSWeston Andros Adamson } 350d72ddcbaSWeston Andros Adamson 351d72ddcbaSWeston Andros Adamson /* 352d72ddcbaSWeston Andros Adamson * nfs_page_group_covers_page 353d72ddcbaSWeston Andros Adamson * @head - head request of page group 354d72ddcbaSWeston Andros Adamson * 355d72ddcbaSWeston Andros Adamson * Return true if the page group with head @head covers the whole page, 356d72ddcbaSWeston Andros Adamson * returns false otherwise 357d72ddcbaSWeston Andros Adamson */ 358d72ddcbaSWeston Andros Adamson static bool nfs_page_group_covers_page(struct nfs_page *req) 359d72ddcbaSWeston Andros Adamson { 360d72ddcbaSWeston Andros Adamson struct nfs_page *tmp; 361d72ddcbaSWeston Andros Adamson unsigned int pos = 0; 362d72ddcbaSWeston Andros Adamson unsigned int len = nfs_page_length(req->wb_page); 363d72ddcbaSWeston Andros Adamson 3641344b7eaSTrond Myklebust nfs_page_group_lock(req); 365d72ddcbaSWeston Andros Adamson 3667e8a30f8STrond Myklebust for (;;) { 367d72ddcbaSWeston Andros Adamson tmp = nfs_page_group_search_locked(req->wb_head, pos); 3687e8a30f8STrond Myklebust if (!tmp) 3697e8a30f8STrond Myklebust break; 3707e8a30f8STrond Myklebust pos = tmp->wb_pgbase + tmp->wb_bytes; 371d72ddcbaSWeston Andros Adamson } 372d72ddcbaSWeston Andros Adamson 373d72ddcbaSWeston Andros Adamson nfs_page_group_unlock(req); 3747e8a30f8STrond Myklebust return pos >= len; 375d72ddcbaSWeston Andros Adamson } 376d72ddcbaSWeston Andros Adamson 3771da177e4SLinus Torvalds /* We can set the PG_uptodate flag if we see that a write request 3781da177e4SLinus Torvalds * covers the full page. 3791da177e4SLinus Torvalds */ 380d72ddcbaSWeston Andros Adamson static void nfs_mark_uptodate(struct nfs_page *req) 3811da177e4SLinus Torvalds { 382d72ddcbaSWeston Andros Adamson if (PageUptodate(req->wb_page)) 3831da177e4SLinus Torvalds return; 384d72ddcbaSWeston Andros Adamson if (!nfs_page_group_covers_page(req)) 3851da177e4SLinus Torvalds return; 386d72ddcbaSWeston Andros Adamson SetPageUptodate(req->wb_page); 3871da177e4SLinus Torvalds } 3881da177e4SLinus Torvalds 3891da177e4SLinus Torvalds static int wb_priority(struct writeback_control *wbc) 3901da177e4SLinus Torvalds { 391e87b4c7aSNeilBrown int ret = 0; 392cca588d6STrond Myklebust 393e87b4c7aSNeilBrown if (wbc->sync_mode == WB_SYNC_ALL) 394e87b4c7aSNeilBrown ret = FLUSH_COND_STABLE; 395e87b4c7aSNeilBrown return ret; 3961da177e4SLinus Torvalds } 3971da177e4SLinus Torvalds 3981da177e4SLinus Torvalds /* 39989a09141SPeter Zijlstra * NFS congestion control 40089a09141SPeter Zijlstra */ 40189a09141SPeter Zijlstra 40289a09141SPeter Zijlstra int nfs_congestion_kb; 40389a09141SPeter Zijlstra 40489a09141SPeter Zijlstra #define NFS_CONGESTION_ON_THRESH (nfs_congestion_kb >> (PAGE_SHIFT-10)) 40589a09141SPeter Zijlstra #define NFS_CONGESTION_OFF_THRESH \ 40689a09141SPeter Zijlstra (NFS_CONGESTION_ON_THRESH - (NFS_CONGESTION_ON_THRESH >> 2)) 40789a09141SPeter Zijlstra 408deed85e7STrond Myklebust static void nfs_set_page_writeback(struct page *page) 40989a09141SPeter Zijlstra { 4100db10944SJan Kara struct inode *inode = page_file_mapping(page)->host; 4110db10944SJan Kara struct nfs_server *nfss = NFS_SERVER(inode); 4125a6d41b3STrond Myklebust int ret = test_set_page_writeback(page); 4135a6d41b3STrond Myklebust 414deed85e7STrond Myklebust WARN_ON_ONCE(ret != 0); 41589a09141SPeter Zijlstra 416277866a0SPeter Zijlstra if (atomic_long_inc_return(&nfss->writeback) > 4170db10944SJan Kara NFS_CONGESTION_ON_THRESH) 4180db10944SJan Kara set_bdi_congested(inode_to_bdi(inode), BLK_RW_ASYNC); 41989a09141SPeter Zijlstra } 42089a09141SPeter Zijlstra 42120633f04SWeston Andros Adamson static void nfs_end_page_writeback(struct nfs_page *req) 42289a09141SPeter Zijlstra { 42320633f04SWeston Andros Adamson struct inode *inode = page_file_mapping(req->wb_page)->host; 42489a09141SPeter Zijlstra struct nfs_server *nfss = NFS_SERVER(inode); 42531a01f09STrond Myklebust bool is_done; 42689a09141SPeter Zijlstra 42731a01f09STrond Myklebust is_done = nfs_page_group_sync_on_bit(req, PG_WB_END); 42831a01f09STrond Myklebust nfs_unlock_request(req); 42931a01f09STrond Myklebust if (!is_done) 43020633f04SWeston Andros Adamson return; 43120633f04SWeston Andros Adamson 43220633f04SWeston Andros Adamson end_page_writeback(req->wb_page); 433c4dc4beeSPeter Zijlstra if (atomic_long_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH) 4340db10944SJan Kara clear_bdi_congested(inode_to_bdi(inode), BLK_RW_ASYNC); 43589a09141SPeter Zijlstra } 43689a09141SPeter Zijlstra 437d4581383SWeston Andros Adamson /* 438d4581383SWeston Andros Adamson * nfs_destroy_unlinked_subrequests - destroy recently unlinked subrequests 439d4581383SWeston Andros Adamson * 440d4581383SWeston Andros Adamson * @destroy_list - request list (using wb_this_page) terminated by @old_head 441d4581383SWeston Andros Adamson * @old_head - the old head of the list 442d4581383SWeston Andros Adamson * 443d4581383SWeston Andros Adamson * All subrequests must be locked and removed from all lists, so at this point 444d4581383SWeston Andros Adamson * they are only "active" in this function, and possibly in nfs_wait_on_request 445d4581383SWeston Andros Adamson * with a reference held by some other context. 446d4581383SWeston Andros Adamson */ 447d4581383SWeston Andros Adamson static void 448d4581383SWeston Andros Adamson nfs_destroy_unlinked_subrequests(struct nfs_page *destroy_list, 449b66aaa8dSTrond Myklebust struct nfs_page *old_head, 450b66aaa8dSTrond Myklebust struct inode *inode) 451d4581383SWeston Andros Adamson { 452d4581383SWeston Andros Adamson while (destroy_list) { 453d4581383SWeston Andros Adamson struct nfs_page *subreq = destroy_list; 454d4581383SWeston Andros Adamson 455d4581383SWeston Andros Adamson destroy_list = (subreq->wb_this_page == old_head) ? 456d4581383SWeston Andros Adamson NULL : subreq->wb_this_page; 457d4581383SWeston Andros Adamson 45808ca8b21STrond Myklebust /* Note: lock subreq in order to change subreq->wb_head */ 45908ca8b21STrond Myklebust nfs_page_set_headlock(subreq); 460d4581383SWeston Andros Adamson WARN_ON_ONCE(old_head != subreq->wb_head); 461d4581383SWeston Andros Adamson 462d4581383SWeston Andros Adamson /* make sure old group is not used */ 463d4581383SWeston Andros Adamson subreq->wb_this_page = subreq; 46408ca8b21STrond Myklebust subreq->wb_head = subreq; 465d4581383SWeston Andros Adamson 466902a4c00STrond Myklebust clear_bit(PG_REMOVE, &subreq->wb_flags); 467902a4c00STrond Myklebust 4685b2b5187STrond Myklebust /* Note: races with nfs_page_group_destroy() */ 4695b2b5187STrond Myklebust if (!kref_read(&subreq->wb_kref)) { 4705b2b5187STrond Myklebust /* Check if we raced with nfs_page_group_destroy() */ 47108ca8b21STrond Myklebust if (test_and_clear_bit(PG_TEARDOWN, &subreq->wb_flags)) { 47208ca8b21STrond Myklebust nfs_page_clear_headlock(subreq); 4735b2b5187STrond Myklebust nfs_free_request(subreq); 47408ca8b21STrond Myklebust } else 47508ca8b21STrond Myklebust nfs_page_clear_headlock(subreq); 4765b2b5187STrond Myklebust continue; 4775b2b5187STrond Myklebust } 47808ca8b21STrond Myklebust nfs_page_clear_headlock(subreq); 479d4581383SWeston Andros Adamson 480add42de3STrond Myklebust nfs_release_request(old_head); 4815b2b5187STrond Myklebust 482b66aaa8dSTrond Myklebust if (test_and_clear_bit(PG_INODE_REF, &subreq->wb_flags)) { 483d4581383SWeston Andros Adamson nfs_release_request(subreq); 484a6b6d5b8STrond Myklebust atomic_long_dec(&NFS_I(inode)->nrequests); 485d4581383SWeston Andros Adamson } 4865b2b5187STrond Myklebust 4875b2b5187STrond Myklebust /* subreq is now totally disconnected from page group or any 4885b2b5187STrond Myklebust * write / commit lists. last chance to wake any waiters */ 4895b2b5187STrond Myklebust nfs_unlock_and_release_request(subreq); 490d4581383SWeston Andros Adamson } 491d4581383SWeston Andros Adamson } 492d4581383SWeston Andros Adamson 493d4581383SWeston Andros Adamson /* 494e00ed89dSTrond Myklebust * nfs_join_page_group - destroy subrequests of the head req 495e00ed89dSTrond Myklebust * @head: the page used to lookup the "page group" of nfs_page structures 496e00ed89dSTrond Myklebust * @inode: Inode to which the request belongs. 497d4581383SWeston Andros Adamson * 498d4581383SWeston Andros Adamson * This function joins all sub requests to the head request by first 499d4581383SWeston Andros Adamson * locking all requests in the group, cancelling any pending operations 500d4581383SWeston Andros Adamson * and finally updating the head request to cover the whole range covered by 501d4581383SWeston Andros Adamson * the (former) group. All subrequests are removed from any write or commit 502d4581383SWeston Andros Adamson * lists, unlinked from the group and destroyed. 503d4581383SWeston Andros Adamson */ 504ed5d588fSTrond Myklebust void 505e00ed89dSTrond Myklebust nfs_join_page_group(struct nfs_page *head, struct inode *inode) 506d4581383SWeston Andros Adamson { 507e00ed89dSTrond Myklebust struct nfs_page *subreq; 508d4581383SWeston Andros Adamson struct nfs_page *destroy_list = NULL; 509a62f8e3bSTrond Myklebust unsigned int pgbase, off, bytes; 510a62f8e3bSTrond Myklebust 511a62f8e3bSTrond Myklebust pgbase = head->wb_pgbase; 512a62f8e3bSTrond Myklebust bytes = head->wb_bytes; 513a62f8e3bSTrond Myklebust off = head->wb_offset; 514a0e265bcSTrond Myklebust for (subreq = head->wb_this_page; subreq != head; 515a0e265bcSTrond Myklebust subreq = subreq->wb_this_page) { 516a62f8e3bSTrond Myklebust /* Subrequests should always form a contiguous range */ 517a62f8e3bSTrond Myklebust if (pgbase > subreq->wb_pgbase) { 518a62f8e3bSTrond Myklebust off -= pgbase - subreq->wb_pgbase; 519a62f8e3bSTrond Myklebust bytes += pgbase - subreq->wb_pgbase; 520a62f8e3bSTrond Myklebust pgbase = subreq->wb_pgbase; 521a62f8e3bSTrond Myklebust } 522a62f8e3bSTrond Myklebust bytes = max(subreq->wb_pgbase + subreq->wb_bytes 523a62f8e3bSTrond Myklebust - pgbase, bytes); 5241bd5d6d0STrond Myklebust } 5251bd5d6d0STrond Myklebust 526a62f8e3bSTrond Myklebust /* Set the head request's range to cover the former page group */ 527a62f8e3bSTrond Myklebust head->wb_pgbase = pgbase; 528a62f8e3bSTrond Myklebust head->wb_bytes = bytes; 529a62f8e3bSTrond Myklebust head->wb_offset = off; 530d4581383SWeston Andros Adamson 531d4581383SWeston Andros Adamson /* Now that all requests are locked, make sure they aren't on any list. 532d4581383SWeston Andros Adamson * Commit list removal accounting is done after locks are dropped */ 533d4581383SWeston Andros Adamson subreq = head; 534d4581383SWeston Andros Adamson do { 535411a99adSWeston Andros Adamson nfs_clear_request_commit(subreq); 536d4581383SWeston Andros Adamson subreq = subreq->wb_this_page; 537d4581383SWeston Andros Adamson } while (subreq != head); 538d4581383SWeston Andros Adamson 539d4581383SWeston Andros Adamson /* unlink subrequests from head, destroy them later */ 540d4581383SWeston Andros Adamson if (head->wb_this_page != head) { 541d4581383SWeston Andros Adamson /* destroy list will be terminated by head */ 542d4581383SWeston Andros Adamson destroy_list = head->wb_this_page; 543d4581383SWeston Andros Adamson head->wb_this_page = head; 544d4581383SWeston Andros Adamson } 545d4581383SWeston Andros Adamson 546b66aaa8dSTrond Myklebust nfs_destroy_unlinked_subrequests(destroy_list, head, inode); 547b5bab9bfSTrond Myklebust } 548b5bab9bfSTrond Myklebust 549e00ed89dSTrond Myklebust /* 550e00ed89dSTrond Myklebust * nfs_lock_and_join_requests - join all subreqs to the head req 551e00ed89dSTrond Myklebust * @page: the page used to lookup the "page group" of nfs_page structures 552e00ed89dSTrond Myklebust * 553e00ed89dSTrond Myklebust * This function joins all sub requests to the head request by first 554e00ed89dSTrond Myklebust * locking all requests in the group, cancelling any pending operations 555e00ed89dSTrond Myklebust * and finally updating the head request to cover the whole range covered by 556e00ed89dSTrond Myklebust * the (former) group. All subrequests are removed from any write or commit 557e00ed89dSTrond Myklebust * lists, unlinked from the group and destroyed. 558e00ed89dSTrond Myklebust * 559e00ed89dSTrond Myklebust * Returns a locked, referenced pointer to the head request - which after 560e00ed89dSTrond Myklebust * this call is guaranteed to be the only request associated with the page. 561e00ed89dSTrond Myklebust * Returns NULL if no requests are found for @page, or a ERR_PTR if an 562e00ed89dSTrond Myklebust * error was encountered. 563e00ed89dSTrond Myklebust */ 564e00ed89dSTrond Myklebust static struct nfs_page * 565e00ed89dSTrond Myklebust nfs_lock_and_join_requests(struct page *page) 566e00ed89dSTrond Myklebust { 567e00ed89dSTrond Myklebust struct inode *inode = page_file_mapping(page)->host; 568e00ed89dSTrond Myklebust struct nfs_page *head; 569e00ed89dSTrond Myklebust int ret; 570e00ed89dSTrond Myklebust 571e00ed89dSTrond Myklebust /* 572e00ed89dSTrond Myklebust * A reference is taken only on the head request which acts as a 573e00ed89dSTrond Myklebust * reference to the whole page group - the group will not be destroyed 574e00ed89dSTrond Myklebust * until the head reference is released. 575e00ed89dSTrond Myklebust */ 576e00ed89dSTrond Myklebust head = nfs_find_and_lock_page_request(page); 577e00ed89dSTrond Myklebust if (IS_ERR_OR_NULL(head)) 578d4581383SWeston Andros Adamson return head; 5790671d8f1SMarkus Elfring 580e00ed89dSTrond Myklebust /* lock each request in the page group */ 581e00ed89dSTrond Myklebust ret = nfs_page_group_lock_subrequests(head); 582e00ed89dSTrond Myklebust if (ret < 0) { 5830671d8f1SMarkus Elfring nfs_unlock_and_release_request(head); 5840671d8f1SMarkus Elfring return ERR_PTR(ret); 585612c9384STrond Myklebust } 586074cc1deSTrond Myklebust 587e00ed89dSTrond Myklebust nfs_join_page_group(head, inode); 588e00ed89dSTrond Myklebust 589e00ed89dSTrond Myklebust return head; 590e00ed89dSTrond Myklebust } 591e00ed89dSTrond Myklebust 5926fbda89bSTrond Myklebust static void nfs_write_error(struct nfs_page *req, int error) 5930bcbf039SPeng Tao { 594861e1671SChuck Lever trace_nfs_write_error(req, error); 5956fbda89bSTrond Myklebust nfs_mapping_set_error(req->wb_page, error); 59606c9fdf3STrond Myklebust nfs_inode_remove_request(req); 5970bcbf039SPeng Tao nfs_end_page_writeback(req); 5981f84ccdfSFred Isaman nfs_release_request(req); 5990bcbf039SPeng Tao } 6000bcbf039SPeng Tao 601074cc1deSTrond Myklebust /* 602074cc1deSTrond Myklebust * Find an associated nfs write request, and prepare to flush it out 603074cc1deSTrond Myklebust * May return an error if the user signalled nfs_wait_on_request(). 604074cc1deSTrond Myklebust */ 605074cc1deSTrond Myklebust static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio, 6066d17d653STrond Myklebust struct page *page) 607074cc1deSTrond Myklebust { 608074cc1deSTrond Myklebust struct nfs_page *req; 609074cc1deSTrond Myklebust int ret = 0; 610074cc1deSTrond Myklebust 6116d17d653STrond Myklebust req = nfs_lock_and_join_requests(page); 612074cc1deSTrond Myklebust if (!req) 613074cc1deSTrond Myklebust goto out; 614074cc1deSTrond Myklebust ret = PTR_ERR(req); 615074cc1deSTrond Myklebust if (IS_ERR(req)) 616074cc1deSTrond Myklebust goto out; 617074cc1deSTrond Myklebust 618deed85e7STrond Myklebust nfs_set_page_writeback(page); 619deed85e7STrond Myklebust WARN_ON_ONCE(test_bit(PG_CLEAN, &req->wb_flags)); 620074cc1deSTrond Myklebust 621a6598813STrond Myklebust /* If there is a fatal error that covers this write, just exit */ 62296c41455STrond Myklebust ret = pgio->pg_error; 62396c41455STrond Myklebust if (nfs_error_is_fatal_on_server(ret)) 624a6598813STrond Myklebust goto out_launder; 625a6598813STrond Myklebust 62696c41455STrond Myklebust ret = 0; 627f8512ad0SFred Isaman if (!nfs_pageio_add_request(pgio, req)) { 628074cc1deSTrond Myklebust ret = pgio->pg_error; 6290bcbf039SPeng Tao /* 630c373fff7STrond Myklebust * Remove the problematic req upon fatal errors on the server 6310bcbf039SPeng Tao */ 6320bcbf039SPeng Tao if (nfs_error_is_fatal(ret)) { 633c373fff7STrond Myklebust if (nfs_error_is_fatal_on_server(ret)) 634a6598813STrond Myklebust goto out_launder; 6358fc75bedSTrond Myklebust } else 6360bcbf039SPeng Tao ret = -EAGAIN; 6378fc75bedSTrond Myklebust nfs_redirty_request(req); 63896c41455STrond Myklebust pgio->pg_error = 0; 63940f90271STrond Myklebust } else 64040f90271STrond Myklebust nfs_add_stats(page_file_mapping(page)->host, 64140f90271STrond Myklebust NFSIOS_WRITEPAGES, 1); 642074cc1deSTrond Myklebust out: 643074cc1deSTrond Myklebust return ret; 644a6598813STrond Myklebust out_launder: 6456fbda89bSTrond Myklebust nfs_write_error(req, ret); 64614bebe3cSTrond Myklebust return 0; 647e261f51fSTrond Myklebust } 648e261f51fSTrond Myklebust 649d6c843b9SPeng Tao static int nfs_do_writepage(struct page *page, struct writeback_control *wbc, 650c373fff7STrond Myklebust struct nfs_pageio_descriptor *pgio) 651f758c885STrond Myklebust { 652cfb506e1STrond Myklebust int ret; 653f758c885STrond Myklebust 6548cd79788SHuang Ying nfs_pageio_cond_complete(pgio, page_index(page)); 6556d17d653STrond Myklebust ret = nfs_page_async_flush(pgio, page); 656cfb506e1STrond Myklebust if (ret == -EAGAIN) { 657cfb506e1STrond Myklebust redirty_page_for_writepage(wbc, page); 65896c41455STrond Myklebust ret = AOP_WRITEPAGE_ACTIVATE; 659cfb506e1STrond Myklebust } 660cfb506e1STrond Myklebust return ret; 661f758c885STrond Myklebust } 662f758c885STrond Myklebust 663e261f51fSTrond Myklebust /* 6641da177e4SLinus Torvalds * Write an mmapped page to the server. 6651da177e4SLinus Torvalds */ 666d6c843b9SPeng Tao static int nfs_writepage_locked(struct page *page, 667c373fff7STrond Myklebust struct writeback_control *wbc) 6681da177e4SLinus Torvalds { 669f758c885STrond Myklebust struct nfs_pageio_descriptor pgio; 67040f90271STrond Myklebust struct inode *inode = page_file_mapping(page)->host; 671e261f51fSTrond Myklebust int err; 6721da177e4SLinus Torvalds 67340f90271STrond Myklebust nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE); 674811ed92eSTrond Myklebust nfs_pageio_init_write(&pgio, inode, 0, 675a20c93e3SChristoph Hellwig false, &nfs_async_write_completion_ops); 676c373fff7STrond Myklebust err = nfs_do_writepage(page, wbc, &pgio); 67796c41455STrond Myklebust pgio.pg_error = 0; 678f758c885STrond Myklebust nfs_pageio_complete(&pgio); 679f758c885STrond Myklebust if (err < 0) 6804d770ccfSTrond Myklebust return err; 68196c41455STrond Myklebust if (nfs_error_is_fatal(pgio.pg_error)) 682f758c885STrond Myklebust return pgio.pg_error; 683f758c885STrond Myklebust return 0; 6844d770ccfSTrond Myklebust } 6854d770ccfSTrond Myklebust 6864d770ccfSTrond Myklebust int nfs_writepage(struct page *page, struct writeback_control *wbc) 6874d770ccfSTrond Myklebust { 688f758c885STrond Myklebust int ret; 6894d770ccfSTrond Myklebust 690c373fff7STrond Myklebust ret = nfs_writepage_locked(page, wbc); 69196c41455STrond Myklebust if (ret != AOP_WRITEPAGE_ACTIVATE) 6921da177e4SLinus Torvalds unlock_page(page); 693f758c885STrond Myklebust return ret; 694f758c885STrond Myklebust } 695f758c885STrond Myklebust 696f758c885STrond Myklebust static int nfs_writepages_callback(struct page *page, struct writeback_control *wbc, void *data) 697f758c885STrond Myklebust { 698f758c885STrond Myklebust int ret; 699f758c885STrond Myklebust 700c373fff7STrond Myklebust ret = nfs_do_writepage(page, wbc, data); 70196c41455STrond Myklebust if (ret != AOP_WRITEPAGE_ACTIVATE) 702f758c885STrond Myklebust unlock_page(page); 703f758c885STrond Myklebust return ret; 7041da177e4SLinus Torvalds } 7051da177e4SLinus Torvalds 706919e3bd9STrond Myklebust static void nfs_io_completion_commit(void *inode) 707919e3bd9STrond Myklebust { 708919e3bd9STrond Myklebust nfs_commit_inode(inode, 0); 709919e3bd9STrond Myklebust } 710919e3bd9STrond Myklebust 7111da177e4SLinus Torvalds int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc) 7121da177e4SLinus Torvalds { 7131da177e4SLinus Torvalds struct inode *inode = mapping->host; 714c63c7b05STrond Myklebust struct nfs_pageio_descriptor pgio; 715ed7bcdb3STrond Myklebust struct nfs_io_completion *ioc = NULL; 716ed7bcdb3STrond Myklebust unsigned int mntflags = NFS_SERVER(inode)->flags; 717ed7bcdb3STrond Myklebust int priority = 0; 7181da177e4SLinus Torvalds int err; 7191da177e4SLinus Torvalds 72091d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES); 72191d5b470SChuck Lever 722ed7bcdb3STrond Myklebust if (!(mntflags & NFS_MOUNT_WRITE_EAGER) || wbc->for_kupdate || 723ed7bcdb3STrond Myklebust wbc->for_background || wbc->for_sync || wbc->for_reclaim) { 7242b17d725STrond Myklebust ioc = nfs_io_completion_alloc(GFP_KERNEL); 725919e3bd9STrond Myklebust if (ioc) 726ed7bcdb3STrond Myklebust nfs_io_completion_init(ioc, nfs_io_completion_commit, 727ed7bcdb3STrond Myklebust inode); 728ed7bcdb3STrond Myklebust priority = wb_priority(wbc); 729ed7bcdb3STrond Myklebust } 730919e3bd9STrond Myklebust 731ed7bcdb3STrond Myklebust nfs_pageio_init_write(&pgio, inode, priority, false, 732a20c93e3SChristoph Hellwig &nfs_async_write_completion_ops); 733919e3bd9STrond Myklebust pgio.pg_io_completion = ioc; 734f758c885STrond Myklebust err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio); 73596c41455STrond Myklebust pgio.pg_error = 0; 736c63c7b05STrond Myklebust nfs_pageio_complete(&pgio); 737919e3bd9STrond Myklebust nfs_io_completion_put(ioc); 73872cb77f4STrond Myklebust 739f758c885STrond Myklebust if (err < 0) 74072cb77f4STrond Myklebust goto out_err; 74172cb77f4STrond Myklebust err = pgio.pg_error; 74296c41455STrond Myklebust if (nfs_error_is_fatal(err)) 74372cb77f4STrond Myklebust goto out_err; 744c63c7b05STrond Myklebust return 0; 74572cb77f4STrond Myklebust out_err: 74672cb77f4STrond Myklebust return err; 7471da177e4SLinus Torvalds } 7481da177e4SLinus Torvalds 7491da177e4SLinus Torvalds /* 7501da177e4SLinus Torvalds * Insert a write request into an inode 7511da177e4SLinus Torvalds */ 752d6d6dc7cSFred Isaman static void nfs_inode_add_request(struct inode *inode, struct nfs_page *req) 7531da177e4SLinus Torvalds { 7544b9bb25bSTrond Myklebust struct address_space *mapping = page_file_mapping(req->wb_page); 7551da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 756e7d39069STrond Myklebust 7572bfc6e56SWeston Andros Adamson WARN_ON_ONCE(req->wb_this_page != req); 7582bfc6e56SWeston Andros Adamson 759e7d39069STrond Myklebust /* Lock the request! */ 7607ad84aa9STrond Myklebust nfs_lock_request(req); 761e7d39069STrond Myklebust 76229418aa4SMel Gorman /* 76329418aa4SMel Gorman * Swap-space should not get truncated. Hence no need to plug the race 76429418aa4SMel Gorman * with invalidate/truncate. 76529418aa4SMel Gorman */ 7664b9bb25bSTrond Myklebust spin_lock(&mapping->private_lock); 7674b9bb25bSTrond Myklebust if (!nfs_have_writebacks(inode) && 7681eb5d98fSJeff Layton NFS_PROTO(inode)->have_delegation(inode, FMODE_WRITE)) 7691eb5d98fSJeff Layton inode_inc_iversion_raw(inode); 77029418aa4SMel Gorman if (likely(!PageSwapCache(req->wb_page))) { 7712df485a7STrond Myklebust set_bit(PG_MAPPED, &req->wb_flags); 772deb7d638STrond Myklebust SetPagePrivate(req->wb_page); 773277459d2STrond Myklebust set_page_private(req->wb_page, (unsigned long)req); 77429418aa4SMel Gorman } 7754b9bb25bSTrond Myklebust spin_unlock(&mapping->private_lock); 776a6b6d5b8STrond Myklebust atomic_long_inc(&nfsi->nrequests); 77717089a29SWeston Andros Adamson /* this a head request for a page group - mark it as having an 778cb1410c7SWeston Andros Adamson * extra reference so sub groups can follow suit. 779cb1410c7SWeston Andros Adamson * This flag also informs pgio layer when to bump nrequests when 780cb1410c7SWeston Andros Adamson * adding subrequests. */ 78117089a29SWeston Andros Adamson WARN_ON(test_and_set_bit(PG_INODE_REF, &req->wb_flags)); 782c03b4024STrond Myklebust kref_get(&req->wb_kref); 7831da177e4SLinus Torvalds } 7841da177e4SLinus Torvalds 7851da177e4SLinus Torvalds /* 78689a09141SPeter Zijlstra * Remove a write request from an inode 7871da177e4SLinus Torvalds */ 7881da177e4SLinus Torvalds static void nfs_inode_remove_request(struct nfs_page *req) 7891da177e4SLinus Torvalds { 7904b9bb25bSTrond Myklebust struct address_space *mapping = page_file_mapping(req->wb_page); 7914b9bb25bSTrond Myklebust struct inode *inode = mapping->host; 7921da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 79320633f04SWeston Andros Adamson struct nfs_page *head; 79420633f04SWeston Andros Adamson 79520633f04SWeston Andros Adamson if (nfs_page_group_sync_on_bit(req, PG_REMOVE)) { 79620633f04SWeston Andros Adamson head = req->wb_head; 7971da177e4SLinus Torvalds 7984b9bb25bSTrond Myklebust spin_lock(&mapping->private_lock); 79967911c8fSAnna Schumaker if (likely(head->wb_page && !PageSwapCache(head->wb_page))) { 80020633f04SWeston Andros Adamson set_page_private(head->wb_page, 0); 80120633f04SWeston Andros Adamson ClearPagePrivate(head->wb_page); 80220633f04SWeston Andros Adamson clear_bit(PG_MAPPED, &head->wb_flags); 80329418aa4SMel Gorman } 8044b9bb25bSTrond Myklebust spin_unlock(&mapping->private_lock); 80520633f04SWeston Andros Adamson } 80617089a29SWeston Andros Adamson 80733ea5aaaSZhangXiaoxu if (test_and_clear_bit(PG_INODE_REF, &req->wb_flags)) { 8081da177e4SLinus Torvalds nfs_release_request(req); 80933ea5aaaSZhangXiaoxu atomic_long_dec(&nfsi->nrequests); 81033ea5aaaSZhangXiaoxu } 8111da177e4SLinus Torvalds } 8121da177e4SLinus Torvalds 81361822ab5STrond Myklebust static void 8146d884e8fSFred nfs_mark_request_dirty(struct nfs_page *req) 81561822ab5STrond Myklebust { 81667911c8fSAnna Schumaker if (req->wb_page) 81761822ab5STrond Myklebust __set_page_dirty_nobuffers(req->wb_page); 81861822ab5STrond Myklebust } 81961822ab5STrond Myklebust 8203a3908c8STrond Myklebust /* 8213a3908c8STrond Myklebust * nfs_page_search_commits_for_head_request_locked 8223a3908c8STrond Myklebust * 8233a3908c8STrond Myklebust * Search through commit lists on @inode for the head request for @page. 8243a3908c8STrond Myklebust * Must be called while holding the inode (which is cinfo) lock. 8253a3908c8STrond Myklebust * 8263a3908c8STrond Myklebust * Returns the head request if found, or NULL if not found. 8273a3908c8STrond Myklebust */ 8283a3908c8STrond Myklebust static struct nfs_page * 8293a3908c8STrond Myklebust nfs_page_search_commits_for_head_request_locked(struct nfs_inode *nfsi, 8303a3908c8STrond Myklebust struct page *page) 8313a3908c8STrond Myklebust { 8323a3908c8STrond Myklebust struct nfs_page *freq, *t; 8333a3908c8STrond Myklebust struct nfs_commit_info cinfo; 8343a3908c8STrond Myklebust struct inode *inode = &nfsi->vfs_inode; 8353a3908c8STrond Myklebust 8363a3908c8STrond Myklebust nfs_init_cinfo_from_inode(&cinfo, inode); 8373a3908c8STrond Myklebust 8383a3908c8STrond Myklebust /* search through pnfs commit lists */ 8393a3908c8STrond Myklebust freq = pnfs_search_commit_reqs(inode, &cinfo, page); 8403a3908c8STrond Myklebust if (freq) 8413a3908c8STrond Myklebust return freq->wb_head; 8423a3908c8STrond Myklebust 8433a3908c8STrond Myklebust /* Linearly search the commit list for the correct request */ 8443a3908c8STrond Myklebust list_for_each_entry_safe(freq, t, &cinfo.mds->list, wb_list) { 8453a3908c8STrond Myklebust if (freq->wb_page == page) 8463a3908c8STrond Myklebust return freq->wb_head; 8473a3908c8STrond Myklebust } 8483a3908c8STrond Myklebust 8493a3908c8STrond Myklebust return NULL; 8503a3908c8STrond Myklebust } 8513a3908c8STrond Myklebust 8528dd37758STrond Myklebust /** 85386d80f97STrond Myklebust * nfs_request_add_commit_list_locked - add request to a commit list 85486d80f97STrond Myklebust * @req: pointer to a struct nfs_page 85586d80f97STrond Myklebust * @dst: commit list head 85686d80f97STrond Myklebust * @cinfo: holds list lock and accounting info 85786d80f97STrond Myklebust * 85886d80f97STrond Myklebust * This sets the PG_CLEAN bit, updates the cinfo count of 85986d80f97STrond Myklebust * number of outstanding requests requiring a commit as well as 86086d80f97STrond Myklebust * the MM page stats. 86186d80f97STrond Myklebust * 862e824f99aSTrond Myklebust * The caller must hold NFS_I(cinfo->inode)->commit_mutex, and the 863e824f99aSTrond Myklebust * nfs_page lock. 86486d80f97STrond Myklebust */ 86586d80f97STrond Myklebust void 86686d80f97STrond Myklebust nfs_request_add_commit_list_locked(struct nfs_page *req, struct list_head *dst, 86786d80f97STrond Myklebust struct nfs_commit_info *cinfo) 86886d80f97STrond Myklebust { 86986d80f97STrond Myklebust set_bit(PG_CLEAN, &req->wb_flags); 87086d80f97STrond Myklebust nfs_list_add_request(req, dst); 8715cb953d4STrond Myklebust atomic_long_inc(&cinfo->mds->ncommit); 87286d80f97STrond Myklebust } 87386d80f97STrond Myklebust EXPORT_SYMBOL_GPL(nfs_request_add_commit_list_locked); 87486d80f97STrond Myklebust 87586d80f97STrond Myklebust /** 8768dd37758STrond Myklebust * nfs_request_add_commit_list - add request to a commit list 8778dd37758STrond Myklebust * @req: pointer to a struct nfs_page 878ea2cf228SFred Isaman * @cinfo: holds list lock and accounting info 8798dd37758STrond Myklebust * 880ea2cf228SFred Isaman * This sets the PG_CLEAN bit, updates the cinfo count of 8818dd37758STrond Myklebust * number of outstanding requests requiring a commit as well as 8828dd37758STrond Myklebust * the MM page stats. 8838dd37758STrond Myklebust * 884ea2cf228SFred Isaman * The caller must _not_ hold the cinfo->lock, but must be 8858dd37758STrond Myklebust * holding the nfs_page lock. 8868dd37758STrond Myklebust */ 8878dd37758STrond Myklebust void 8886272dcc6SAnna Schumaker nfs_request_add_commit_list(struct nfs_page *req, struct nfs_commit_info *cinfo) 8898dd37758STrond Myklebust { 890e824f99aSTrond Myklebust mutex_lock(&NFS_I(cinfo->inode)->commit_mutex); 8916272dcc6SAnna Schumaker nfs_request_add_commit_list_locked(req, &cinfo->mds->list, cinfo); 892e824f99aSTrond Myklebust mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex); 89367911c8fSAnna Schumaker if (req->wb_page) 89486d80f97STrond Myklebust nfs_mark_page_unstable(req->wb_page, cinfo); 8958dd37758STrond Myklebust } 8968dd37758STrond Myklebust EXPORT_SYMBOL_GPL(nfs_request_add_commit_list); 8978dd37758STrond Myklebust 8988dd37758STrond Myklebust /** 8998dd37758STrond Myklebust * nfs_request_remove_commit_list - Remove request from a commit list 9008dd37758STrond Myklebust * @req: pointer to a nfs_page 901ea2cf228SFred Isaman * @cinfo: holds list lock and accounting info 9028dd37758STrond Myklebust * 903ea2cf228SFred Isaman * This clears the PG_CLEAN bit, and updates the cinfo's count of 9048dd37758STrond Myklebust * number of outstanding requests requiring a commit 9058dd37758STrond Myklebust * It does not update the MM page stats. 9068dd37758STrond Myklebust * 907ea2cf228SFred Isaman * The caller _must_ hold the cinfo->lock and the nfs_page lock. 9088dd37758STrond Myklebust */ 9098dd37758STrond Myklebust void 910ea2cf228SFred Isaman nfs_request_remove_commit_list(struct nfs_page *req, 911ea2cf228SFred Isaman struct nfs_commit_info *cinfo) 9128dd37758STrond Myklebust { 9138dd37758STrond Myklebust if (!test_and_clear_bit(PG_CLEAN, &(req)->wb_flags)) 9148dd37758STrond Myklebust return; 9158dd37758STrond Myklebust nfs_list_remove_request(req); 9165cb953d4STrond Myklebust atomic_long_dec(&cinfo->mds->ncommit); 9178dd37758STrond Myklebust } 9188dd37758STrond Myklebust EXPORT_SYMBOL_GPL(nfs_request_remove_commit_list); 9198dd37758STrond Myklebust 920ea2cf228SFred Isaman static void nfs_init_cinfo_from_inode(struct nfs_commit_info *cinfo, 921ea2cf228SFred Isaman struct inode *inode) 922ea2cf228SFred Isaman { 923fe238e60SDave Wysochanski cinfo->inode = inode; 924ea2cf228SFred Isaman cinfo->mds = &NFS_I(inode)->commit_info; 925ea2cf228SFred Isaman cinfo->ds = pnfs_get_ds_info(inode); 926b359f9d0SFred Isaman cinfo->dreq = NULL; 927f453a54aSFred Isaman cinfo->completion_ops = &nfs_commit_completion_ops; 928ea2cf228SFred Isaman } 929ea2cf228SFred Isaman 930ea2cf228SFred Isaman void nfs_init_cinfo(struct nfs_commit_info *cinfo, 931ea2cf228SFred Isaman struct inode *inode, 932ea2cf228SFred Isaman struct nfs_direct_req *dreq) 933ea2cf228SFred Isaman { 9341763da12SFred Isaman if (dreq) 9351763da12SFred Isaman nfs_init_cinfo_from_dreq(cinfo, dreq); 9361763da12SFred Isaman else 937ea2cf228SFred Isaman nfs_init_cinfo_from_inode(cinfo, inode); 938ea2cf228SFred Isaman } 939ea2cf228SFred Isaman EXPORT_SYMBOL_GPL(nfs_init_cinfo); 9408dd37758STrond Myklebust 9411da177e4SLinus Torvalds /* 9421da177e4SLinus Torvalds * Add a request to the inode's commit list. 9431da177e4SLinus Torvalds */ 9441763da12SFred Isaman void 945ea2cf228SFred Isaman nfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg, 946b57ff130SWeston Andros Adamson struct nfs_commit_info *cinfo, u32 ds_commit_idx) 9471da177e4SLinus Torvalds { 948b57ff130SWeston Andros Adamson if (pnfs_mark_request_commit(req, lseg, cinfo, ds_commit_idx)) 9498dd37758STrond Myklebust return; 9506272dcc6SAnna Schumaker nfs_request_add_commit_list(req, cinfo); 9511da177e4SLinus Torvalds } 9528e821cadSTrond Myklebust 953d6d6dc7cSFred Isaman static void 954d6d6dc7cSFred Isaman nfs_clear_page_commit(struct page *page) 955e468bae9STrond Myklebust { 9568d92890bSNeilBrown dec_node_page_state(page, NR_WRITEBACK); 95793f78d88STejun Heo dec_wb_stat(&inode_to_bdi(page_file_mapping(page)->host)->wb, 9588d92890bSNeilBrown WB_WRITEBACK); 959e468bae9STrond Myklebust } 960d6d6dc7cSFred Isaman 961b5bab9bfSTrond Myklebust /* Called holding the request lock on @req */ 9628dd37758STrond Myklebust static void 963d6d6dc7cSFred Isaman nfs_clear_request_commit(struct nfs_page *req) 964d6d6dc7cSFred Isaman { 9658dd37758STrond Myklebust if (test_bit(PG_CLEAN, &req->wb_flags)) { 9669fcd5960STrond Myklebust struct nfs_open_context *ctx = nfs_req_openctx(req); 9679fcd5960STrond Myklebust struct inode *inode = d_inode(ctx->dentry); 968ea2cf228SFred Isaman struct nfs_commit_info cinfo; 969d6d6dc7cSFred Isaman 970ea2cf228SFred Isaman nfs_init_cinfo_from_inode(&cinfo, inode); 971e824f99aSTrond Myklebust mutex_lock(&NFS_I(inode)->commit_mutex); 972ea2cf228SFred Isaman if (!pnfs_clear_request_commit(req, &cinfo)) { 973ea2cf228SFred Isaman nfs_request_remove_commit_list(req, &cinfo); 974d6d6dc7cSFred Isaman } 975e824f99aSTrond Myklebust mutex_unlock(&NFS_I(inode)->commit_mutex); 9768dd37758STrond Myklebust nfs_clear_page_commit(req->wb_page); 9778dd37758STrond Myklebust } 978e468bae9STrond Myklebust } 979e468bae9STrond Myklebust 980d45f60c6SWeston Andros Adamson int nfs_write_need_commit(struct nfs_pgio_header *hdr) 9818e821cadSTrond Myklebust { 982c65e6254SWeston Andros Adamson if (hdr->verf.committed == NFS_DATA_SYNC) 983d45f60c6SWeston Andros Adamson return hdr->lseg == NULL; 984c65e6254SWeston Andros Adamson return hdr->verf.committed != NFS_FILE_SYNC; 9858e821cadSTrond Myklebust } 9868e821cadSTrond Myklebust 987919e3bd9STrond Myklebust static void nfs_async_write_init(struct nfs_pgio_header *hdr) 988919e3bd9STrond Myklebust { 989919e3bd9STrond Myklebust nfs_io_completion_get(hdr->io_completion); 990919e3bd9STrond Myklebust } 991919e3bd9STrond Myklebust 992061ae2edSFred Isaman static void nfs_write_completion(struct nfs_pgio_header *hdr) 9936c75dc0dSFred Isaman { 994ea2cf228SFred Isaman struct nfs_commit_info cinfo; 9956c75dc0dSFred Isaman unsigned long bytes = 0; 9966c75dc0dSFred Isaman 9976c75dc0dSFred Isaman if (test_bit(NFS_IOHDR_REDO, &hdr->flags)) 9986c75dc0dSFred Isaman goto out; 999ea2cf228SFred Isaman nfs_init_cinfo_from_inode(&cinfo, hdr->inode); 10006c75dc0dSFred Isaman while (!list_empty(&hdr->pages)) { 10016c75dc0dSFred Isaman struct nfs_page *req = nfs_list_entry(hdr->pages.next); 10026c75dc0dSFred Isaman 10036c75dc0dSFred Isaman bytes += req->wb_bytes; 10046c75dc0dSFred Isaman nfs_list_remove_request(req); 10056c75dc0dSFred Isaman if (test_bit(NFS_IOHDR_ERROR, &hdr->flags) && 10066c75dc0dSFred Isaman (hdr->good_bytes < bytes)) { 1007861e1671SChuck Lever trace_nfs_comp_error(req, hdr->error); 10086fbda89bSTrond Myklebust nfs_mapping_set_error(req->wb_page, hdr->error); 10096c75dc0dSFred Isaman goto remove_req; 10106c75dc0dSFred Isaman } 1011c65e6254SWeston Andros Adamson if (nfs_write_need_commit(hdr)) { 101233344e0fSTrond Myklebust /* Reset wb_nio, since the write was successful. */ 101333344e0fSTrond Myklebust req->wb_nio = 0; 1014f79d06f5SAnna Schumaker memcpy(&req->wb_verf, &hdr->verf.verifier, sizeof(req->wb_verf)); 1015b57ff130SWeston Andros Adamson nfs_mark_request_commit(req, hdr->lseg, &cinfo, 1016a7d42ddbSWeston Andros Adamson hdr->pgio_mirror_idx); 10176c75dc0dSFred Isaman goto next; 10186c75dc0dSFred Isaman } 10196c75dc0dSFred Isaman remove_req: 10206c75dc0dSFred Isaman nfs_inode_remove_request(req); 10216c75dc0dSFred Isaman next: 102220633f04SWeston Andros Adamson nfs_end_page_writeback(req); 10233aff4ebbSTrond Myklebust nfs_release_request(req); 10246c75dc0dSFred Isaman } 10256c75dc0dSFred Isaman out: 1026919e3bd9STrond Myklebust nfs_io_completion_put(hdr->io_completion); 10276c75dc0dSFred Isaman hdr->release(hdr); 10286c75dc0dSFred Isaman } 10296c75dc0dSFred Isaman 1030ce59515cSAnna Schumaker unsigned long 1031ea2cf228SFred Isaman nfs_reqs_to_commit(struct nfs_commit_info *cinfo) 1032fb8a1f11STrond Myklebust { 10335cb953d4STrond Myklebust return atomic_long_read(&cinfo->mds->ncommit); 1034fb8a1f11STrond Myklebust } 1035fb8a1f11STrond Myklebust 1036e824f99aSTrond Myklebust /* NFS_I(cinfo->inode)->commit_mutex held by caller */ 10371763da12SFred Isaman int 1038ea2cf228SFred Isaman nfs_scan_commit_list(struct list_head *src, struct list_head *dst, 1039ea2cf228SFred Isaman struct nfs_commit_info *cinfo, int max) 1040d6d6dc7cSFred Isaman { 1041137da553STrond Myklebust struct nfs_page *req, *tmp; 1042d6d6dc7cSFred Isaman int ret = 0; 1043d6d6dc7cSFred Isaman 1044137da553STrond Myklebust restart: 1045137da553STrond Myklebust list_for_each_entry_safe(req, tmp, src, wb_list) { 10467ad84aa9STrond Myklebust kref_get(&req->wb_kref); 10472ce209c4STrond Myklebust if (!nfs_lock_request(req)) { 10482ce209c4STrond Myklebust int status; 1049137da553STrond Myklebust 1050137da553STrond Myklebust /* Prevent deadlock with nfs_lock_and_join_requests */ 1051137da553STrond Myklebust if (!list_empty(dst)) { 1052137da553STrond Myklebust nfs_release_request(req); 1053137da553STrond Myklebust continue; 1054137da553STrond Myklebust } 1055137da553STrond Myklebust /* Ensure we make progress to prevent livelock */ 10562ce209c4STrond Myklebust mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex); 10572ce209c4STrond Myklebust status = nfs_wait_on_request(req); 10582ce209c4STrond Myklebust nfs_release_request(req); 10592ce209c4STrond Myklebust mutex_lock(&NFS_I(cinfo->inode)->commit_mutex); 10602ce209c4STrond Myklebust if (status < 0) 10612ce209c4STrond Myklebust break; 1062137da553STrond Myklebust goto restart; 10632ce209c4STrond Myklebust } 1064ea2cf228SFred Isaman nfs_request_remove_commit_list(req, cinfo); 10655d2a9d9dSTrond Myklebust clear_bit(PG_COMMIT_TO_DS, &req->wb_flags); 10668dd37758STrond Myklebust nfs_list_add_request(req, dst); 1067d6d6dc7cSFred Isaman ret++; 10681763da12SFred Isaman if ((ret == max) && !cinfo->dreq) 1069d6d6dc7cSFred Isaman break; 1070e824f99aSTrond Myklebust cond_resched(); 1071d6d6dc7cSFred Isaman } 1072d6d6dc7cSFred Isaman return ret; 1073d6d6dc7cSFred Isaman } 10745d2a9d9dSTrond Myklebust EXPORT_SYMBOL_GPL(nfs_scan_commit_list); 1075d6d6dc7cSFred Isaman 10761da177e4SLinus Torvalds /* 10771da177e4SLinus Torvalds * nfs_scan_commit - Scan an inode for commit requests 10781da177e4SLinus Torvalds * @inode: NFS inode to scan 1079ea2cf228SFred Isaman * @dst: mds destination list 1080ea2cf228SFred Isaman * @cinfo: mds and ds lists of reqs ready to commit 10811da177e4SLinus Torvalds * 10821da177e4SLinus Torvalds * Moves requests from the inode's 'commit' request list. 10831da177e4SLinus Torvalds * The requests are *not* checked to ensure that they form a contiguous set. 10841da177e4SLinus Torvalds */ 10851763da12SFred Isaman int 1086ea2cf228SFred Isaman nfs_scan_commit(struct inode *inode, struct list_head *dst, 1087ea2cf228SFred Isaman struct nfs_commit_info *cinfo) 10881da177e4SLinus Torvalds { 1089d6d6dc7cSFred Isaman int ret = 0; 1090fb8a1f11STrond Myklebust 10915cb953d4STrond Myklebust if (!atomic_long_read(&cinfo->mds->ncommit)) 10925cb953d4STrond Myklebust return 0; 1093e824f99aSTrond Myklebust mutex_lock(&NFS_I(cinfo->inode)->commit_mutex); 10945cb953d4STrond Myklebust if (atomic_long_read(&cinfo->mds->ncommit) > 0) { 10958dd37758STrond Myklebust const int max = INT_MAX; 1096d6d6dc7cSFred Isaman 1097ea2cf228SFred Isaman ret = nfs_scan_commit_list(&cinfo->mds->list, dst, 1098ea2cf228SFred Isaman cinfo, max); 1099ea2cf228SFred Isaman ret += pnfs_scan_commit_lists(inode, cinfo, max - ret); 1100d6d6dc7cSFred Isaman } 1101e824f99aSTrond Myklebust mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex); 1102ff778d02STrond Myklebust return ret; 11031da177e4SLinus Torvalds } 1104d6d6dc7cSFred Isaman 11051da177e4SLinus Torvalds /* 1106e7d39069STrond Myklebust * Search for an existing write request, and attempt to update 1107e7d39069STrond Myklebust * it to reflect a new dirty region on a given page. 11081da177e4SLinus Torvalds * 1109e7d39069STrond Myklebust * If the attempt fails, then the existing request is flushed out 1110e7d39069STrond Myklebust * to disk. 11111da177e4SLinus Torvalds */ 1112e7d39069STrond Myklebust static struct nfs_page *nfs_try_to_update_request(struct inode *inode, 1113e7d39069STrond Myklebust struct page *page, 1114e7d39069STrond Myklebust unsigned int offset, 1115e7d39069STrond Myklebust unsigned int bytes) 11161da177e4SLinus Torvalds { 1117e7d39069STrond Myklebust struct nfs_page *req; 1118e7d39069STrond Myklebust unsigned int rqend; 1119e7d39069STrond Myklebust unsigned int end; 11201da177e4SLinus Torvalds int error; 1121277459d2STrond Myklebust 1122e7d39069STrond Myklebust end = offset + bytes; 1123e7d39069STrond Myklebust 1124f6032f21STrond Myklebust req = nfs_lock_and_join_requests(page); 1125f6032f21STrond Myklebust if (IS_ERR_OR_NULL(req)) 1126f6032f21STrond Myklebust return req; 11272bfc6e56SWeston Andros Adamson 1128e7d39069STrond Myklebust rqend = req->wb_offset + req->wb_bytes; 1129e7d39069STrond Myklebust /* 1130e7d39069STrond Myklebust * Tell the caller to flush out the request if 1131e7d39069STrond Myklebust * the offsets are non-contiguous. 1132e7d39069STrond Myklebust * Note: nfs_flush_incompatible() will already 1133e7d39069STrond Myklebust * have flushed out requests having wrong owners. 1134e7d39069STrond Myklebust */ 1135f6032f21STrond Myklebust if (offset > rqend || end < req->wb_offset) 1136e7d39069STrond Myklebust goto out_flushme; 1137e7d39069STrond Myklebust 11381da177e4SLinus Torvalds /* Okay, the request matches. Update the region */ 11391da177e4SLinus Torvalds if (offset < req->wb_offset) { 11401da177e4SLinus Torvalds req->wb_offset = offset; 11411da177e4SLinus Torvalds req->wb_pgbase = offset; 11421da177e4SLinus Torvalds } 11431da177e4SLinus Torvalds if (end > rqend) 11441da177e4SLinus Torvalds req->wb_bytes = end - req->wb_offset; 1145e7d39069STrond Myklebust else 1146e7d39069STrond Myklebust req->wb_bytes = rqend - req->wb_offset; 114733344e0fSTrond Myklebust req->wb_nio = 0; 1148e7d39069STrond Myklebust return req; 1149e7d39069STrond Myklebust out_flushme: 1150f6032f21STrond Myklebust /* 1151f6032f21STrond Myklebust * Note: we mark the request dirty here because 1152f6032f21STrond Myklebust * nfs_lock_and_join_requests() cannot preserve 1153f6032f21STrond Myklebust * commit flags, so we have to replay the write. 1154f6032f21STrond Myklebust */ 1155f6032f21STrond Myklebust nfs_mark_request_dirty(req); 1156f6032f21STrond Myklebust nfs_unlock_and_release_request(req); 1157e7d39069STrond Myklebust error = nfs_wb_page(inode, page); 1158f6032f21STrond Myklebust return (error < 0) ? ERR_PTR(error) : NULL; 1159e7d39069STrond Myklebust } 11601da177e4SLinus Torvalds 1161e7d39069STrond Myklebust /* 1162e7d39069STrond Myklebust * Try to update an existing write request, or create one if there is none. 1163e7d39069STrond Myklebust * 1164e7d39069STrond Myklebust * Note: Should always be called with the Page Lock held to prevent races 1165e7d39069STrond Myklebust * if we have to add a new request. Also assumes that the caller has 1166e7d39069STrond Myklebust * already called nfs_flush_incompatible() if necessary. 1167e7d39069STrond Myklebust */ 1168e7d39069STrond Myklebust static struct nfs_page * nfs_setup_write_request(struct nfs_open_context* ctx, 1169e7d39069STrond Myklebust struct page *page, unsigned int offset, unsigned int bytes) 1170e7d39069STrond Myklebust { 1171d56b4ddfSMel Gorman struct inode *inode = page_file_mapping(page)->host; 1172e7d39069STrond Myklebust struct nfs_page *req; 1173e7d39069STrond Myklebust 1174e7d39069STrond Myklebust req = nfs_try_to_update_request(inode, page, offset, bytes); 1175e7d39069STrond Myklebust if (req != NULL) 1176e7d39069STrond Myklebust goto out; 117728b1d3f5STrond Myklebust req = nfs_create_request(ctx, page, offset, bytes); 1178e7d39069STrond Myklebust if (IS_ERR(req)) 1179e7d39069STrond Myklebust goto out; 1180d6d6dc7cSFred Isaman nfs_inode_add_request(inode, req); 1181efc91ed0STrond Myklebust out: 118261e930a9STrond Myklebust return req; 11831da177e4SLinus Torvalds } 11841da177e4SLinus Torvalds 1185e7d39069STrond Myklebust static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page, 1186e7d39069STrond Myklebust unsigned int offset, unsigned int count) 1187e7d39069STrond Myklebust { 1188e7d39069STrond Myklebust struct nfs_page *req; 1189e7d39069STrond Myklebust 1190e7d39069STrond Myklebust req = nfs_setup_write_request(ctx, page, offset, count); 1191e7d39069STrond Myklebust if (IS_ERR(req)) 1192e7d39069STrond Myklebust return PTR_ERR(req); 1193e7d39069STrond Myklebust /* Update file length */ 1194e7d39069STrond Myklebust nfs_grow_file(page, offset, count); 1195d72ddcbaSWeston Andros Adamson nfs_mark_uptodate(req); 1196a6305ddbSTrond Myklebust nfs_mark_request_dirty(req); 11971d1afcbcSTrond Myklebust nfs_unlock_and_release_request(req); 1198e7d39069STrond Myklebust return 0; 1199e7d39069STrond Myklebust } 1200e7d39069STrond Myklebust 12011da177e4SLinus Torvalds int nfs_flush_incompatible(struct file *file, struct page *page) 12021da177e4SLinus Torvalds { 1203cd3758e3STrond Myklebust struct nfs_open_context *ctx = nfs_file_open_context(file); 12042a369153STrond Myklebust struct nfs_lock_context *l_ctx; 1205bd61e0a9SJeff Layton struct file_lock_context *flctx = file_inode(file)->i_flctx; 12061da177e4SLinus Torvalds struct nfs_page *req; 12071a54533eSTrond Myklebust int do_flush, status; 12081da177e4SLinus Torvalds /* 12091da177e4SLinus Torvalds * Look for a request corresponding to this page. If there 12101da177e4SLinus Torvalds * is one, and it belongs to another file, we flush it out 12111da177e4SLinus Torvalds * before we try to copy anything into the page. Do this 12121da177e4SLinus Torvalds * due to the lack of an ACCESS-type call in NFSv2. 12131da177e4SLinus Torvalds * Also do the same if we find a request from an existing 12141da177e4SLinus Torvalds * dropped page. 12151da177e4SLinus Torvalds */ 12161a54533eSTrond Myklebust do { 121784d3a9a9SWeston Andros Adamson req = nfs_page_find_head_request(page); 12181a54533eSTrond Myklebust if (req == NULL) 12191a54533eSTrond Myklebust return 0; 12202a369153STrond Myklebust l_ctx = req->wb_lock_context; 1221138a2935STrond Myklebust do_flush = req->wb_page != page || 12229fcd5960STrond Myklebust !nfs_match_open_context(nfs_req_openctx(req), ctx); 1223bd61e0a9SJeff Layton if (l_ctx && flctx && 1224bd61e0a9SJeff Layton !(list_empty_careful(&flctx->flc_posix) && 1225bd61e0a9SJeff Layton list_empty_careful(&flctx->flc_flock))) { 1226d51fdb87SNeilBrown do_flush |= l_ctx->lockowner != current->files; 12275263e31eSJeff Layton } 12281da177e4SLinus Torvalds nfs_release_request(req); 12291a54533eSTrond Myklebust if (!do_flush) 12301a54533eSTrond Myklebust return 0; 1231d56b4ddfSMel Gorman status = nfs_wb_page(page_file_mapping(page)->host, page); 12321a54533eSTrond Myklebust } while (status == 0); 12331a54533eSTrond Myklebust return status; 12341da177e4SLinus Torvalds } 12351da177e4SLinus Torvalds 12361da177e4SLinus Torvalds /* 1237dc24826bSAndy Adamson * Avoid buffered writes when a open context credential's key would 1238dc24826bSAndy Adamson * expire soon. 1239dc24826bSAndy Adamson * 1240dc24826bSAndy Adamson * Returns -EACCES if the key will expire within RPC_KEY_EXPIRE_FAIL. 1241dc24826bSAndy Adamson * 1242dc24826bSAndy Adamson * Return 0 and set a credential flag which triggers the inode to flush 1243dc24826bSAndy Adamson * and performs NFS_FILE_SYNC writes if the key will expired within 1244dc24826bSAndy Adamson * RPC_KEY_EXPIRE_TIMEO. 1245dc24826bSAndy Adamson */ 1246dc24826bSAndy Adamson int 1247dc24826bSAndy Adamson nfs_key_timeout_notify(struct file *filp, struct inode *inode) 1248dc24826bSAndy Adamson { 1249dc24826bSAndy Adamson struct nfs_open_context *ctx = nfs_file_open_context(filp); 1250dc24826bSAndy Adamson 1251ddf529eeSNeilBrown if (nfs_ctx_key_to_expire(ctx, inode) && 1252ddf529eeSNeilBrown !ctx->ll_cred) 1253ddf529eeSNeilBrown /* Already expired! */ 1254ddf529eeSNeilBrown return -EACCES; 1255ddf529eeSNeilBrown return 0; 1256dc24826bSAndy Adamson } 1257dc24826bSAndy Adamson 1258dc24826bSAndy Adamson /* 1259dc24826bSAndy Adamson * Test if the open context credential key is marked to expire soon. 1260dc24826bSAndy Adamson */ 1261ce52914eSScott Mayhew bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx, struct inode *inode) 1262dc24826bSAndy Adamson { 1263ce52914eSScott Mayhew struct rpc_auth *auth = NFS_SERVER(inode)->client->cl_auth; 1264ddf529eeSNeilBrown struct rpc_cred *cred = ctx->ll_cred; 1265ddf529eeSNeilBrown struct auth_cred acred = { 1266a52458b4SNeilBrown .cred = ctx->cred, 1267ddf529eeSNeilBrown }; 1268ce52914eSScott Mayhew 1269ddf529eeSNeilBrown if (cred && !cred->cr_ops->crmatch(&acred, cred, 0)) { 1270ddf529eeSNeilBrown put_rpccred(cred); 1271ddf529eeSNeilBrown ctx->ll_cred = NULL; 1272ddf529eeSNeilBrown cred = NULL; 1273ddf529eeSNeilBrown } 1274ddf529eeSNeilBrown if (!cred) 1275ddf529eeSNeilBrown cred = auth->au_ops->lookup_cred(auth, &acred, 0); 1276ddf529eeSNeilBrown if (!cred || IS_ERR(cred)) 1277ddf529eeSNeilBrown return true; 1278ddf529eeSNeilBrown ctx->ll_cred = cred; 1279ddf529eeSNeilBrown return !!(cred->cr_ops->crkey_timeout && 1280ddf529eeSNeilBrown cred->cr_ops->crkey_timeout(cred)); 1281dc24826bSAndy Adamson } 1282dc24826bSAndy Adamson 1283dc24826bSAndy Adamson /* 12845d47a356STrond Myklebust * If the page cache is marked as unsafe or invalid, then we can't rely on 12855d47a356STrond Myklebust * the PageUptodate() flag. In this case, we will need to turn off 12865d47a356STrond Myklebust * write optimisations that depend on the page contents being correct. 12875d47a356STrond Myklebust */ 1288fc9dc401STrond Myklebust static bool nfs_write_pageuptodate(struct page *page, struct inode *inode, 1289fc9dc401STrond Myklebust unsigned int pagelen) 12905d47a356STrond Myklebust { 1291d529ef83SJeff Layton struct nfs_inode *nfsi = NFS_I(inode); 1292d529ef83SJeff Layton 12938d197a56STrond Myklebust if (nfs_have_delegated_attributes(inode)) 12948d197a56STrond Myklebust goto out; 1295fc9dc401STrond Myklebust if (nfsi->cache_validity & 1296fc9dc401STrond Myklebust (NFS_INO_REVAL_PAGECACHE | NFS_INO_INVALID_SIZE)) 1297d529ef83SJeff Layton return false; 12984db72b40SJeff Layton smp_rmb(); 1299fc9dc401STrond Myklebust if (test_bit(NFS_INO_INVALIDATING, &nfsi->flags) && pagelen != 0) 13008d197a56STrond Myklebust return false; 13018d197a56STrond Myklebust out: 1302fc9dc401STrond Myklebust if (nfsi->cache_validity & NFS_INO_INVALID_DATA && pagelen != 0) 130318dd78c4SScott Mayhew return false; 13048d197a56STrond Myklebust return PageUptodate(page) != 0; 13055d47a356STrond Myklebust } 13065d47a356STrond Myklebust 13075263e31eSJeff Layton static bool 13085263e31eSJeff Layton is_whole_file_wrlock(struct file_lock *fl) 13095263e31eSJeff Layton { 13105263e31eSJeff Layton return fl->fl_start == 0 && fl->fl_end == OFFSET_MAX && 13115263e31eSJeff Layton fl->fl_type == F_WRLCK; 13125263e31eSJeff Layton } 13135263e31eSJeff Layton 1314c7559663SScott Mayhew /* If we know the page is up to date, and we're not using byte range locks (or 1315c7559663SScott Mayhew * if we have the whole file locked for writing), it may be more efficient to 1316c7559663SScott Mayhew * extend the write to cover the entire page in order to avoid fragmentation 1317c7559663SScott Mayhew * inefficiencies. 1318c7559663SScott Mayhew * 1319263b4509SScott Mayhew * If the file is opened for synchronous writes then we can just skip the rest 1320263b4509SScott Mayhew * of the checks. 1321c7559663SScott Mayhew */ 1322fc9dc401STrond Myklebust static int nfs_can_extend_write(struct file *file, struct page *page, 1323fc9dc401STrond Myklebust struct inode *inode, unsigned int pagelen) 1324c7559663SScott Mayhew { 13255263e31eSJeff Layton int ret; 13265263e31eSJeff Layton struct file_lock_context *flctx = inode->i_flctx; 13275263e31eSJeff Layton struct file_lock *fl; 13285263e31eSJeff Layton 1329c7559663SScott Mayhew if (file->f_flags & O_DSYNC) 1330c7559663SScott Mayhew return 0; 1331fc9dc401STrond Myklebust if (!nfs_write_pageuptodate(page, inode, pagelen)) 1332263b4509SScott Mayhew return 0; 1333c7559663SScott Mayhew if (NFS_PROTO(inode)->have_delegation(inode, FMODE_WRITE)) 1334c7559663SScott Mayhew return 1; 1335bd61e0a9SJeff Layton if (!flctx || (list_empty_careful(&flctx->flc_flock) && 1336bd61e0a9SJeff Layton list_empty_careful(&flctx->flc_posix))) 13378fa4592aSTrond Myklebust return 1; 13385263e31eSJeff Layton 13395263e31eSJeff Layton /* Check to see if there are whole file write locks */ 13405263e31eSJeff Layton ret = 0; 13416109c850SJeff Layton spin_lock(&flctx->flc_lock); 1342bd61e0a9SJeff Layton if (!list_empty(&flctx->flc_posix)) { 1343bd61e0a9SJeff Layton fl = list_first_entry(&flctx->flc_posix, struct file_lock, 1344bd61e0a9SJeff Layton fl_list); 1345bd61e0a9SJeff Layton if (is_whole_file_wrlock(fl)) 13465263e31eSJeff Layton ret = 1; 1347bd61e0a9SJeff Layton } else if (!list_empty(&flctx->flc_flock)) { 13485263e31eSJeff Layton fl = list_first_entry(&flctx->flc_flock, struct file_lock, 13495263e31eSJeff Layton fl_list); 13505263e31eSJeff Layton if (fl->fl_type == F_WRLCK) 13515263e31eSJeff Layton ret = 1; 13525263e31eSJeff Layton } 13536109c850SJeff Layton spin_unlock(&flctx->flc_lock); 13545263e31eSJeff Layton return ret; 1355c7559663SScott Mayhew } 1356c7559663SScott Mayhew 13575d47a356STrond Myklebust /* 13581da177e4SLinus Torvalds * Update and possibly write a cached page of an NFS file. 13591da177e4SLinus Torvalds * 13601da177e4SLinus Torvalds * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad 13611da177e4SLinus Torvalds * things with a page scheduled for an RPC call (e.g. invalidate it). 13621da177e4SLinus Torvalds */ 13631da177e4SLinus Torvalds int nfs_updatepage(struct file *file, struct page *page, 13641da177e4SLinus Torvalds unsigned int offset, unsigned int count) 13651da177e4SLinus Torvalds { 1366cd3758e3STrond Myklebust struct nfs_open_context *ctx = nfs_file_open_context(file); 1367d2ceb7e5SBenjamin Coddington struct address_space *mapping = page_file_mapping(page); 1368d2ceb7e5SBenjamin Coddington struct inode *inode = mapping->host; 1369fc9dc401STrond Myklebust unsigned int pagelen = nfs_page_length(page); 13701da177e4SLinus Torvalds int status = 0; 13711da177e4SLinus Torvalds 137291d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE); 137391d5b470SChuck Lever 13746de1472fSAl Viro dprintk("NFS: nfs_updatepage(%pD2 %d@%lld)\n", 13756de1472fSAl Viro file, count, (long long)(page_file_offset(page) + offset)); 13761da177e4SLinus Torvalds 1377149a4fddSBenjamin Coddington if (!count) 1378149a4fddSBenjamin Coddington goto out; 1379149a4fddSBenjamin Coddington 1380fc9dc401STrond Myklebust if (nfs_can_extend_write(file, page, inode, pagelen)) { 1381fc9dc401STrond Myklebust count = max(count + offset, pagelen); 13821da177e4SLinus Torvalds offset = 0; 13831da177e4SLinus Torvalds } 13841da177e4SLinus Torvalds 1385e21195a7STrond Myklebust status = nfs_writepage_setup(ctx, page, offset, count); 138603fa9e84STrond Myklebust if (status < 0) 1387d2ceb7e5SBenjamin Coddington nfs_set_pageerror(mapping); 138859b7c05fSTrond Myklebust else 138959b7c05fSTrond Myklebust __set_page_dirty_nobuffers(page); 1390149a4fddSBenjamin Coddington out: 139148186c7dSChuck Lever dprintk("NFS: nfs_updatepage returns %d (isize %lld)\n", 13921da177e4SLinus Torvalds status, (long long)i_size_read(inode)); 13931da177e4SLinus Torvalds return status; 13941da177e4SLinus Torvalds } 13951da177e4SLinus Torvalds 13963ff7576dSTrond Myklebust static int flush_task_priority(int how) 13971da177e4SLinus Torvalds { 13981da177e4SLinus Torvalds switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) { 13991da177e4SLinus Torvalds case FLUSH_HIGHPRI: 14001da177e4SLinus Torvalds return RPC_PRIORITY_HIGH; 14011da177e4SLinus Torvalds case FLUSH_LOWPRI: 14021da177e4SLinus Torvalds return RPC_PRIORITY_LOW; 14031da177e4SLinus Torvalds } 14041da177e4SLinus Torvalds return RPC_PRIORITY_NORMAL; 14051da177e4SLinus Torvalds } 14061da177e4SLinus Torvalds 1407d45f60c6SWeston Andros Adamson static void nfs_initiate_write(struct nfs_pgio_header *hdr, 1408d45f60c6SWeston Andros Adamson struct rpc_message *msg, 1409abde71f4STom Haynes const struct nfs_rpc_ops *rpc_ops, 14101ed26f33SAnna Schumaker struct rpc_task_setup *task_setup_data, int how) 14111da177e4SLinus Torvalds { 14123ff7576dSTrond Myklebust int priority = flush_task_priority(how); 14131da177e4SLinus Torvalds 14141ed26f33SAnna Schumaker task_setup_data->priority = priority; 1415fb91fb0eSAnna Schumaker rpc_ops->write_setup(hdr, msg, &task_setup_data->rpc_client); 14165bb2a7cbSTrond Myklebust trace_nfs_initiate_write(hdr); 1417275acaafSTrond Myklebust } 1418275acaafSTrond Myklebust 14196d884e8fSFred /* If a nfs_flush_* function fails, it should remove reqs from @head and 14206d884e8fSFred * call this on each, which will prepare them to be retried on next 14216d884e8fSFred * writeback using standard nfs. 14226d884e8fSFred */ 14236d884e8fSFred static void nfs_redirty_request(struct nfs_page *req) 14246d884e8fSFred { 142533344e0fSTrond Myklebust /* Bump the transmission count */ 142633344e0fSTrond Myklebust req->wb_nio++; 14276d884e8fSFred nfs_mark_request_dirty(req); 14289fcd5960STrond Myklebust set_bit(NFS_CONTEXT_RESEND_WRITES, &nfs_req_openctx(req)->flags); 142920633f04SWeston Andros Adamson nfs_end_page_writeback(req); 14303aff4ebbSTrond Myklebust nfs_release_request(req); 14316d884e8fSFred } 14326d884e8fSFred 1433df3accb8STrond Myklebust static void nfs_async_write_error(struct list_head *head, int error) 14346c75dc0dSFred Isaman { 14356c75dc0dSFred Isaman struct nfs_page *req; 14366c75dc0dSFred Isaman 14376c75dc0dSFred Isaman while (!list_empty(head)) { 14386c75dc0dSFred Isaman req = nfs_list_entry(head->next); 14396c75dc0dSFred Isaman nfs_list_remove_request(req); 14406fbda89bSTrond Myklebust if (nfs_error_is_fatal(error)) 14416fbda89bSTrond Myklebust nfs_write_error(req, error); 14426fbda89bSTrond Myklebust else 14436c75dc0dSFred Isaman nfs_redirty_request(req); 14446c75dc0dSFred Isaman } 14456c75dc0dSFred Isaman } 14466c75dc0dSFred Isaman 1447dc602dd7STrond Myklebust static void nfs_async_write_reschedule_io(struct nfs_pgio_header *hdr) 1448dc602dd7STrond Myklebust { 1449df3accb8STrond Myklebust nfs_async_write_error(&hdr->pages, 0); 14507be7b3caSTrond Myklebust filemap_fdatawrite_range(hdr->inode->i_mapping, hdr->args.offset, 14517be7b3caSTrond Myklebust hdr->args.offset + hdr->args.count - 1); 1452dc602dd7STrond Myklebust } 1453dc602dd7STrond Myklebust 1454061ae2edSFred Isaman static const struct nfs_pgio_completion_ops nfs_async_write_completion_ops = { 1455919e3bd9STrond Myklebust .init_hdr = nfs_async_write_init, 1456061ae2edSFred Isaman .error_cleanup = nfs_async_write_error, 1457061ae2edSFred Isaman .completion = nfs_write_completion, 1458dc602dd7STrond Myklebust .reschedule_io = nfs_async_write_reschedule_io, 1459061ae2edSFred Isaman }; 1460061ae2edSFred Isaman 146157208fa7SBryan Schumaker void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, 1462a20c93e3SChristoph Hellwig struct inode *inode, int ioflags, bool force_mds, 1463061ae2edSFred Isaman const struct nfs_pgio_completion_ops *compl_ops) 14641751c363STrond Myklebust { 1465a20c93e3SChristoph Hellwig struct nfs_server *server = NFS_SERVER(inode); 146641d8d5b7SAnna Schumaker const struct nfs_pageio_ops *pg_ops = &nfs_pgio_rw_ops; 1467a20c93e3SChristoph Hellwig 1468a20c93e3SChristoph Hellwig #ifdef CONFIG_NFS_V4_1 1469a20c93e3SChristoph Hellwig if (server->pnfs_curr_ld && !force_mds) 1470a20c93e3SChristoph Hellwig pg_ops = server->pnfs_curr_ld->pg_write_ops; 1471a20c93e3SChristoph Hellwig #endif 14724a0de55cSAnna Schumaker nfs_pageio_init(pgio, inode, pg_ops, compl_ops, &nfs_rw_write_ops, 14733bde7afdSTrond Myklebust server->wsize, ioflags); 14741751c363STrond Myklebust } 1475ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_pageio_init_write); 14761751c363STrond Myklebust 1477dce81290STrond Myklebust void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio) 1478dce81290STrond Myklebust { 1479a7d42ddbSWeston Andros Adamson struct nfs_pgio_mirror *mirror; 1480a7d42ddbSWeston Andros Adamson 14816f29b9bbSKinglong Mee if (pgio->pg_ops && pgio->pg_ops->pg_cleanup) 14826f29b9bbSKinglong Mee pgio->pg_ops->pg_cleanup(pgio); 14836f29b9bbSKinglong Mee 148441d8d5b7SAnna Schumaker pgio->pg_ops = &nfs_pgio_rw_ops; 1485a7d42ddbSWeston Andros Adamson 1486a7d42ddbSWeston Andros Adamson nfs_pageio_stop_mirroring(pgio); 1487a7d42ddbSWeston Andros Adamson 1488a7d42ddbSWeston Andros Adamson mirror = &pgio->pg_mirrors[0]; 1489a7d42ddbSWeston Andros Adamson mirror->pg_bsize = NFS_SERVER(pgio->pg_inode)->wsize; 1490dce81290STrond Myklebust } 14911f945357STrond Myklebust EXPORT_SYMBOL_GPL(nfs_pageio_reset_write_mds); 1492dce81290STrond Myklebust 14931da177e4SLinus Torvalds 14940b7c0153SFred Isaman void nfs_commit_prepare(struct rpc_task *task, void *calldata) 14950b7c0153SFred Isaman { 14960b7c0153SFred Isaman struct nfs_commit_data *data = calldata; 14970b7c0153SFred Isaman 14980b7c0153SFred Isaman NFS_PROTO(data->inode)->commit_rpc_prepare(task, data); 14990b7c0153SFred Isaman } 15000b7c0153SFred Isaman 15011f2edbe3STrond Myklebust /* 15021f2edbe3STrond Myklebust * Special version of should_remove_suid() that ignores capabilities. 15031f2edbe3STrond Myklebust */ 15041f2edbe3STrond Myklebust static int nfs_should_remove_suid(const struct inode *inode) 15051f2edbe3STrond Myklebust { 15061f2edbe3STrond Myklebust umode_t mode = inode->i_mode; 15071f2edbe3STrond Myklebust int kill = 0; 1508788e7a89STrond Myklebust 15091f2edbe3STrond Myklebust /* suid always must be killed */ 15101f2edbe3STrond Myklebust if (unlikely(mode & S_ISUID)) 15111f2edbe3STrond Myklebust kill = ATTR_KILL_SUID; 15121f2edbe3STrond Myklebust 15131f2edbe3STrond Myklebust /* 15141f2edbe3STrond Myklebust * sgid without any exec bits is just a mandatory locking mark; leave 15151f2edbe3STrond Myklebust * it alone. If some exec bits are set, it's a real sgid; kill it. 15161f2edbe3STrond Myklebust */ 15171f2edbe3STrond Myklebust if (unlikely((mode & S_ISGID) && (mode & S_IXGRP))) 15181f2edbe3STrond Myklebust kill |= ATTR_KILL_SGID; 15191f2edbe3STrond Myklebust 15201f2edbe3STrond Myklebust if (unlikely(kill && S_ISREG(mode))) 15211f2edbe3STrond Myklebust return kill; 15221f2edbe3STrond Myklebust 15231f2edbe3STrond Myklebust return 0; 15241f2edbe3STrond Myklebust } 1525788e7a89STrond Myklebust 1526a08a8cd3STrond Myklebust static void nfs_writeback_check_extend(struct nfs_pgio_header *hdr, 1527a08a8cd3STrond Myklebust struct nfs_fattr *fattr) 1528a08a8cd3STrond Myklebust { 1529a08a8cd3STrond Myklebust struct nfs_pgio_args *argp = &hdr->args; 1530a08a8cd3STrond Myklebust struct nfs_pgio_res *resp = &hdr->res; 15312b83d3deSTrond Myklebust u64 size = argp->offset + resp->count; 1532a08a8cd3STrond Myklebust 1533a08a8cd3STrond Myklebust if (!(fattr->valid & NFS_ATTR_FATTR_SIZE)) 15342b83d3deSTrond Myklebust fattr->size = size; 15352b83d3deSTrond Myklebust if (nfs_size_to_loff_t(fattr->size) < i_size_read(hdr->inode)) { 15362b83d3deSTrond Myklebust fattr->valid &= ~NFS_ATTR_FATTR_SIZE; 1537a08a8cd3STrond Myklebust return; 15382b83d3deSTrond Myklebust } 15392b83d3deSTrond Myklebust if (size != fattr->size) 1540a08a8cd3STrond Myklebust return; 1541a08a8cd3STrond Myklebust /* Set attribute barrier */ 1542a08a8cd3STrond Myklebust nfs_fattr_set_barrier(fattr); 15432b83d3deSTrond Myklebust /* ...and update size */ 15442b83d3deSTrond Myklebust fattr->valid |= NFS_ATTR_FATTR_SIZE; 1545a08a8cd3STrond Myklebust } 1546a08a8cd3STrond Myklebust 1547a08a8cd3STrond Myklebust void nfs_writeback_update_inode(struct nfs_pgio_header *hdr) 1548a08a8cd3STrond Myklebust { 15492b83d3deSTrond Myklebust struct nfs_fattr *fattr = &hdr->fattr; 1550a08a8cd3STrond Myklebust struct inode *inode = hdr->inode; 1551a08a8cd3STrond Myklebust 1552a08a8cd3STrond Myklebust spin_lock(&inode->i_lock); 1553a08a8cd3STrond Myklebust nfs_writeback_check_extend(hdr, fattr); 1554a08a8cd3STrond Myklebust nfs_post_op_update_inode_force_wcc_locked(inode, fattr); 1555a08a8cd3STrond Myklebust spin_unlock(&inode->i_lock); 1556a08a8cd3STrond Myklebust } 1557a08a8cd3STrond Myklebust EXPORT_SYMBOL_GPL(nfs_writeback_update_inode); 1558a08a8cd3STrond Myklebust 15591da177e4SLinus Torvalds /* 15601da177e4SLinus Torvalds * This function is called when the WRITE call is complete. 15611da177e4SLinus Torvalds */ 1562d45f60c6SWeston Andros Adamson static int nfs_writeback_done(struct rpc_task *task, 1563d45f60c6SWeston Andros Adamson struct nfs_pgio_header *hdr, 15640eecb214SAnna Schumaker struct inode *inode) 15651da177e4SLinus Torvalds { 1566788e7a89STrond Myklebust int status; 15671da177e4SLinus Torvalds 1568f551e44fSChuck Lever /* 1569f551e44fSChuck Lever * ->write_done will attempt to use post-op attributes to detect 1570f551e44fSChuck Lever * conflicting writes by other clients. A strict interpretation 1571f551e44fSChuck Lever * of close-to-open would allow us to continue caching even if 1572f551e44fSChuck Lever * another writer had changed the file, but some applications 1573f551e44fSChuck Lever * depend on tighter cache coherency when writing. 1574f551e44fSChuck Lever */ 1575d45f60c6SWeston Andros Adamson status = NFS_PROTO(inode)->write_done(task, hdr); 1576788e7a89STrond Myklebust if (status != 0) 15770eecb214SAnna Schumaker return status; 15788224b273SChuck Lever 1579d45f60c6SWeston Andros Adamson nfs_add_stats(inode, NFSIOS_SERVERWRITTENBYTES, hdr->res.count); 15805bb2a7cbSTrond Myklebust trace_nfs_writeback_done(task, hdr); 158191d5b470SChuck Lever 1582d45f60c6SWeston Andros Adamson if (hdr->res.verf->committed < hdr->args.stable && 1583d45f60c6SWeston Andros Adamson task->tk_status >= 0) { 15841da177e4SLinus Torvalds /* We tried a write call, but the server did not 15851da177e4SLinus Torvalds * commit data to stable storage even though we 15861da177e4SLinus Torvalds * requested it. 15871da177e4SLinus Torvalds * Note: There is a known bug in Tru64 < 5.0 in which 15881da177e4SLinus Torvalds * the server reports NFS_DATA_SYNC, but performs 15891da177e4SLinus Torvalds * NFS_FILE_SYNC. We therefore implement this checking 15901da177e4SLinus Torvalds * as a dprintk() in order to avoid filling syslog. 15911da177e4SLinus Torvalds */ 15921da177e4SLinus Torvalds static unsigned long complain; 15931da177e4SLinus Torvalds 1594a69aef14SFred Isaman /* Note this will print the MDS for a DS write */ 15951da177e4SLinus Torvalds if (time_before(complain, jiffies)) { 15961da177e4SLinus Torvalds dprintk("NFS: faulty NFS server %s:" 15971da177e4SLinus Torvalds " (committed = %d) != (stable = %d)\n", 1598cd841605SFred Isaman NFS_SERVER(inode)->nfs_client->cl_hostname, 1599d45f60c6SWeston Andros Adamson hdr->res.verf->committed, hdr->args.stable); 16001da177e4SLinus Torvalds complain = jiffies + 300 * HZ; 16011da177e4SLinus Torvalds } 16021da177e4SLinus Torvalds } 16031f2edbe3STrond Myklebust 16041f2edbe3STrond Myklebust /* Deal with the suid/sgid bit corner case */ 160516e14375STrond Myklebust if (nfs_should_remove_suid(inode)) { 160616e14375STrond Myklebust spin_lock(&inode->i_lock); 1607*ac46b3d7STrond Myklebust nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER); 160816e14375STrond Myklebust spin_unlock(&inode->i_lock); 160916e14375STrond Myklebust } 16100eecb214SAnna Schumaker return 0; 16110eecb214SAnna Schumaker } 16120eecb214SAnna Schumaker 16130eecb214SAnna Schumaker /* 16140eecb214SAnna Schumaker * This function is called when the WRITE call is complete. 16150eecb214SAnna Schumaker */ 1616d45f60c6SWeston Andros Adamson static void nfs_writeback_result(struct rpc_task *task, 1617d45f60c6SWeston Andros Adamson struct nfs_pgio_header *hdr) 16180eecb214SAnna Schumaker { 1619d45f60c6SWeston Andros Adamson struct nfs_pgio_args *argp = &hdr->args; 1620d45f60c6SWeston Andros Adamson struct nfs_pgio_res *resp = &hdr->res; 16211f2edbe3STrond Myklebust 16221f2edbe3STrond Myklebust if (resp->count < argp->count) { 16231da177e4SLinus Torvalds static unsigned long complain; 16241da177e4SLinus Torvalds 16256c75dc0dSFred Isaman /* This a short write! */ 1626d45f60c6SWeston Andros Adamson nfs_inc_stats(hdr->inode, NFSIOS_SHORTWRITE); 162791d5b470SChuck Lever 16281da177e4SLinus Torvalds /* Has the server at least made some progress? */ 16296c75dc0dSFred Isaman if (resp->count == 0) { 16306c75dc0dSFred Isaman if (time_before(complain, jiffies)) { 16316c75dc0dSFred Isaman printk(KERN_WARNING 16326c75dc0dSFred Isaman "NFS: Server wrote zero bytes, expected %u.\n", 16336c75dc0dSFred Isaman argp->count); 16346c75dc0dSFred Isaman complain = jiffies + 300 * HZ; 16356c75dc0dSFred Isaman } 1636d45f60c6SWeston Andros Adamson nfs_set_pgio_error(hdr, -EIO, argp->offset); 16376c75dc0dSFred Isaman task->tk_status = -EIO; 16386c75dc0dSFred Isaman return; 16396c75dc0dSFred Isaman } 1640f8417b48SKinglong Mee 1641f8417b48SKinglong Mee /* For non rpc-based layout drivers, retry-through-MDS */ 1642f8417b48SKinglong Mee if (!task->tk_ops) { 1643f8417b48SKinglong Mee hdr->pnfs_error = -EAGAIN; 1644f8417b48SKinglong Mee return; 1645f8417b48SKinglong Mee } 1646f8417b48SKinglong Mee 16471da177e4SLinus Torvalds /* Was this an NFSv2 write or an NFSv3 stable write? */ 16481da177e4SLinus Torvalds if (resp->verf->committed != NFS_UNSTABLE) { 16491da177e4SLinus Torvalds /* Resend from where the server left off */ 1650d45f60c6SWeston Andros Adamson hdr->mds_offset += resp->count; 16511da177e4SLinus Torvalds argp->offset += resp->count; 16521da177e4SLinus Torvalds argp->pgbase += resp->count; 16531da177e4SLinus Torvalds argp->count -= resp->count; 16541da177e4SLinus Torvalds } else { 16551da177e4SLinus Torvalds /* Resend as a stable write in order to avoid 16561da177e4SLinus Torvalds * headaches in the case of a server crash. 16571da177e4SLinus Torvalds */ 16581da177e4SLinus Torvalds argp->stable = NFS_FILE_SYNC; 16591da177e4SLinus Torvalds } 16608c9cb714STrond Myklebust resp->count = 0; 16618c9cb714STrond Myklebust resp->verf->committed = 0; 1662d00c5d43STrond Myklebust rpc_restart_call_prepare(task); 16631da177e4SLinus Torvalds } 16641da177e4SLinus Torvalds } 16651da177e4SLinus Torvalds 1666af7cf057STrond Myklebust static int wait_on_commit(struct nfs_mds_commit_info *cinfo) 166771d0a611STrond Myklebust { 1668723c921eSPeter Zijlstra return wait_var_event_killable(&cinfo->rpcs_out, 1669723c921eSPeter Zijlstra !atomic_read(&cinfo->rpcs_out)); 1670af7cf057STrond Myklebust } 1671af7cf057STrond Myklebust 1672af7cf057STrond Myklebust static void nfs_commit_begin(struct nfs_mds_commit_info *cinfo) 1673af7cf057STrond Myklebust { 1674af7cf057STrond Myklebust atomic_inc(&cinfo->rpcs_out); 1675af7cf057STrond Myklebust } 1676af7cf057STrond Myklebust 1677af7cf057STrond Myklebust static void nfs_commit_end(struct nfs_mds_commit_info *cinfo) 1678af7cf057STrond Myklebust { 1679af7cf057STrond Myklebust if (atomic_dec_and_test(&cinfo->rpcs_out)) 1680723c921eSPeter Zijlstra wake_up_var(&cinfo->rpcs_out); 168171d0a611STrond Myklebust } 168271d0a611STrond Myklebust 16830b7c0153SFred Isaman void nfs_commitdata_release(struct nfs_commit_data *data) 16841da177e4SLinus Torvalds { 16850b7c0153SFred Isaman put_nfs_open_context(data->context); 16860b7c0153SFred Isaman nfs_commit_free(data); 16871da177e4SLinus Torvalds } 1688e0c2b380SFred Isaman EXPORT_SYMBOL_GPL(nfs_commitdata_release); 16891da177e4SLinus Torvalds 16900b7c0153SFred Isaman int nfs_initiate_commit(struct rpc_clnt *clnt, struct nfs_commit_data *data, 1691c36aae9aSPeng Tao const struct nfs_rpc_ops *nfs_ops, 16929ace33cdSFred Isaman const struct rpc_call_ops *call_ops, 16939f0ec176SAndy Adamson int how, int flags) 16941da177e4SLinus Torvalds { 169507737691STrond Myklebust struct rpc_task *task; 16969ace33cdSFred Isaman int priority = flush_task_priority(how); 1697bdc7f021STrond Myklebust struct rpc_message msg = { 1698bdc7f021STrond Myklebust .rpc_argp = &data->args, 1699bdc7f021STrond Myklebust .rpc_resp = &data->res, 17009ace33cdSFred Isaman .rpc_cred = data->cred, 1701bdc7f021STrond Myklebust }; 170284115e1cSTrond Myklebust struct rpc_task_setup task_setup_data = { 170307737691STrond Myklebust .task = &data->task, 17049ace33cdSFred Isaman .rpc_client = clnt, 1705bdc7f021STrond Myklebust .rpc_message = &msg, 17069ace33cdSFred Isaman .callback_ops = call_ops, 170784115e1cSTrond Myklebust .callback_data = data, 1708101070caSTrond Myklebust .workqueue = nfsiod_workqueue, 17094fa7ef69STrond Myklebust .flags = RPC_TASK_ASYNC | flags, 17103ff7576dSTrond Myklebust .priority = priority, 171184115e1cSTrond Myklebust }; 1712788e7a89STrond Myklebust /* Set up the initial task struct. */ 1713e9ae1ee2SAnna Schumaker nfs_ops->commit_setup(data, &msg, &task_setup_data.rpc_client); 17148224b273SChuck Lever trace_nfs_initiate_commit(data); 17151da177e4SLinus Torvalds 1716b4839ebeSKinglong Mee dprintk("NFS: initiated commit call\n"); 1717bdc7f021STrond Myklebust 171807737691STrond Myklebust task = rpc_run_task(&task_setup_data); 1719dbae4c73STrond Myklebust if (IS_ERR(task)) 1720dbae4c73STrond Myklebust return PTR_ERR(task); 1721d2224e7aSJeff Layton if (how & FLUSH_SYNC) 1722d2224e7aSJeff Layton rpc_wait_for_completion_task(task); 172307737691STrond Myklebust rpc_put_task(task); 1724dbae4c73STrond Myklebust return 0; 17251da177e4SLinus Torvalds } 1726e0c2b380SFred Isaman EXPORT_SYMBOL_GPL(nfs_initiate_commit); 17271da177e4SLinus Torvalds 1728378520b8SPeng Tao static loff_t nfs_get_lwb(struct list_head *head) 1729378520b8SPeng Tao { 1730378520b8SPeng Tao loff_t lwb = 0; 1731378520b8SPeng Tao struct nfs_page *req; 1732378520b8SPeng Tao 1733378520b8SPeng Tao list_for_each_entry(req, head, wb_list) 1734378520b8SPeng Tao if (lwb < (req_offset(req) + req->wb_bytes)) 1735378520b8SPeng Tao lwb = req_offset(req) + req->wb_bytes; 1736378520b8SPeng Tao 1737378520b8SPeng Tao return lwb; 1738378520b8SPeng Tao } 1739378520b8SPeng Tao 17401da177e4SLinus Torvalds /* 17419ace33cdSFred Isaman * Set up the argument/result storage required for the RPC call. 17429ace33cdSFred Isaman */ 17430b7c0153SFred Isaman void nfs_init_commit(struct nfs_commit_data *data, 1744988b6dceSFred Isaman struct list_head *head, 1745f453a54aSFred Isaman struct pnfs_layout_segment *lseg, 1746f453a54aSFred Isaman struct nfs_commit_info *cinfo) 17479ace33cdSFred Isaman { 174819573c93STrond Myklebust struct nfs_page *first; 174919573c93STrond Myklebust struct nfs_open_context *ctx; 175019573c93STrond Myklebust struct inode *inode; 17519ace33cdSFred Isaman 17529ace33cdSFred Isaman /* Set up the RPC argument and reply structs 17539ace33cdSFred Isaman * NB: take care not to mess about with data->commit et al. */ 17549ace33cdSFred Isaman 175519573c93STrond Myklebust if (head) 17569ace33cdSFred Isaman list_splice_init(head, &data->pages); 17579ace33cdSFred Isaman 175819573c93STrond Myklebust first = nfs_list_entry(data->pages.next); 175919573c93STrond Myklebust ctx = nfs_req_openctx(first); 176019573c93STrond Myklebust inode = d_inode(ctx->dentry); 176119573c93STrond Myklebust 17629ace33cdSFred Isaman data->inode = inode; 17639fcd5960STrond Myklebust data->cred = ctx->cred; 1764988b6dceSFred Isaman data->lseg = lseg; /* reference transferred */ 1765378520b8SPeng Tao /* only set lwb for pnfs commit */ 1766378520b8SPeng Tao if (lseg) 1767378520b8SPeng Tao data->lwb = nfs_get_lwb(&data->pages); 17689ace33cdSFred Isaman data->mds_ops = &nfs_commit_ops; 1769f453a54aSFred Isaman data->completion_ops = cinfo->completion_ops; 1770b359f9d0SFred Isaman data->dreq = cinfo->dreq; 17719ace33cdSFred Isaman 17729ace33cdSFred Isaman data->args.fh = NFS_FH(data->inode); 17739ace33cdSFred Isaman /* Note: we always request a commit of the entire inode */ 17749ace33cdSFred Isaman data->args.offset = 0; 17759ace33cdSFred Isaman data->args.count = 0; 17769fcd5960STrond Myklebust data->context = get_nfs_open_context(ctx); 17779ace33cdSFred Isaman data->res.fattr = &data->fattr; 17789ace33cdSFred Isaman data->res.verf = &data->verf; 17799ace33cdSFred Isaman nfs_fattr_init(&data->fattr); 17809ace33cdSFred Isaman } 1781e0c2b380SFred Isaman EXPORT_SYMBOL_GPL(nfs_init_commit); 17829ace33cdSFred Isaman 1783e0c2b380SFred Isaman void nfs_retry_commit(struct list_head *page_list, 1784ea2cf228SFred Isaman struct pnfs_layout_segment *lseg, 1785b57ff130SWeston Andros Adamson struct nfs_commit_info *cinfo, 1786b57ff130SWeston Andros Adamson u32 ds_commit_idx) 178764bfeb49SFred Isaman { 178864bfeb49SFred Isaman struct nfs_page *req; 178964bfeb49SFred Isaman 179064bfeb49SFred Isaman while (!list_empty(page_list)) { 179164bfeb49SFred Isaman req = nfs_list_entry(page_list->next); 179264bfeb49SFred Isaman nfs_list_remove_request(req); 1793b57ff130SWeston Andros Adamson nfs_mark_request_commit(req, lseg, cinfo, ds_commit_idx); 1794487b9b8aSTom Haynes if (!cinfo->dreq) 1795487b9b8aSTom Haynes nfs_clear_page_commit(req->wb_page); 17961d1afcbcSTrond Myklebust nfs_unlock_and_release_request(req); 179764bfeb49SFred Isaman } 179864bfeb49SFred Isaman } 1799e0c2b380SFred Isaman EXPORT_SYMBOL_GPL(nfs_retry_commit); 180064bfeb49SFred Isaman 1801b20135d0STrond Myklebust static void 1802b20135d0STrond Myklebust nfs_commit_resched_write(struct nfs_commit_info *cinfo, 1803b20135d0STrond Myklebust struct nfs_page *req) 1804b20135d0STrond Myklebust { 1805b20135d0STrond Myklebust __set_page_dirty_nobuffers(req->wb_page); 1806b20135d0STrond Myklebust } 1807b20135d0STrond Myklebust 18089ace33cdSFred Isaman /* 18091da177e4SLinus Torvalds * Commit dirty pages 18101da177e4SLinus Torvalds */ 18111da177e4SLinus Torvalds static int 1812ea2cf228SFred Isaman nfs_commit_list(struct inode *inode, struct list_head *head, int how, 1813ea2cf228SFred Isaman struct nfs_commit_info *cinfo) 18141da177e4SLinus Torvalds { 18150b7c0153SFred Isaman struct nfs_commit_data *data; 18161da177e4SLinus Torvalds 1817ade8febdSWeston Andros Adamson /* another commit raced with us */ 1818ade8febdSWeston Andros Adamson if (list_empty(head)) 1819ade8febdSWeston Andros Adamson return 0; 1820ade8febdSWeston Andros Adamson 1821518662e0SNeilBrown data = nfs_commitdata_alloc(true); 18221da177e4SLinus Torvalds 18231da177e4SLinus Torvalds /* Set up the argument struct */ 1824f453a54aSFred Isaman nfs_init_commit(data, head, NULL, cinfo); 1825f453a54aSFred Isaman atomic_inc(&cinfo->mds->rpcs_out); 1826c36aae9aSPeng Tao return nfs_initiate_commit(NFS_CLIENT(inode), data, NFS_PROTO(inode), 18274fa7ef69STrond Myklebust data->mds_ops, how, RPC_TASK_CRED_NOREF); 18281da177e4SLinus Torvalds } 18291da177e4SLinus Torvalds 18301da177e4SLinus Torvalds /* 18311da177e4SLinus Torvalds * COMMIT call returned 18321da177e4SLinus Torvalds */ 1833788e7a89STrond Myklebust static void nfs_commit_done(struct rpc_task *task, void *calldata) 18341da177e4SLinus Torvalds { 18350b7c0153SFred Isaman struct nfs_commit_data *data = calldata; 18361da177e4SLinus Torvalds 1837a3f565b1SChuck Lever dprintk("NFS: %5u nfs_commit_done (status %d)\n", 18381da177e4SLinus Torvalds task->tk_pid, task->tk_status); 18391da177e4SLinus Torvalds 1840788e7a89STrond Myklebust /* Call the NFS version-specific code */ 1841c0d0e96bSTrond Myklebust NFS_PROTO(data->inode)->commit_done(task, data); 18427bdd297eSTrond Myklebust trace_nfs_commit_done(task, data); 1843c9d8f89dSTrond Myklebust } 1844c9d8f89dSTrond Myklebust 1845f453a54aSFred Isaman static void nfs_commit_release_pages(struct nfs_commit_data *data) 1846c9d8f89dSTrond Myklebust { 1847221203ceSTrond Myklebust const struct nfs_writeverf *verf = data->res.verf; 1848c9d8f89dSTrond Myklebust struct nfs_page *req; 1849c9d8f89dSTrond Myklebust int status = data->task.tk_status; 1850f453a54aSFred Isaman struct nfs_commit_info cinfo; 1851353db796SNeilBrown struct nfs_server *nfss; 1852788e7a89STrond Myklebust 18531da177e4SLinus Torvalds while (!list_empty(&data->pages)) { 18541da177e4SLinus Torvalds req = nfs_list_entry(data->pages.next); 18551da177e4SLinus Torvalds nfs_list_remove_request(req); 185667911c8fSAnna Schumaker if (req->wb_page) 1857d6d6dc7cSFred Isaman nfs_clear_page_commit(req->wb_page); 18581da177e4SLinus Torvalds 18591e8968c5SNiels de Vos dprintk("NFS: commit (%s/%llu %d@%lld)", 18609fcd5960STrond Myklebust nfs_req_openctx(req)->dentry->d_sb->s_id, 18619fcd5960STrond Myklebust (unsigned long long)NFS_FILEID(d_inode(nfs_req_openctx(req)->dentry)), 18621da177e4SLinus Torvalds req->wb_bytes, 18631da177e4SLinus Torvalds (long long)req_offset(req)); 1864c9d8f89dSTrond Myklebust if (status < 0) { 18656fbda89bSTrond Myklebust if (req->wb_page) { 1866861e1671SChuck Lever trace_nfs_commit_error(req, status); 18676fbda89bSTrond Myklebust nfs_mapping_set_error(req->wb_page, status); 18681da177e4SLinus Torvalds nfs_inode_remove_request(req); 18696fbda89bSTrond Myklebust } 1870ddeaa637SJoe Perches dprintk_cont(", error = %d\n", status); 18711da177e4SLinus Torvalds goto next; 18721da177e4SLinus Torvalds } 18731da177e4SLinus Torvalds 18741da177e4SLinus Torvalds /* Okay, COMMIT succeeded, apparently. Check the verifier 18751da177e4SLinus Torvalds * returned by the server against all stored verfs. */ 18761f28476dSTrond Myklebust if (nfs_write_match_verf(verf, req)) { 18771da177e4SLinus Torvalds /* We have a match */ 187838a33101SKinglong Mee if (req->wb_page) 18791da177e4SLinus Torvalds nfs_inode_remove_request(req); 1880ddeaa637SJoe Perches dprintk_cont(" OK\n"); 18811da177e4SLinus Torvalds goto next; 18821da177e4SLinus Torvalds } 18831da177e4SLinus Torvalds /* We have a mismatch. Write the page again */ 1884ddeaa637SJoe Perches dprintk_cont(" mismatch\n"); 18856d884e8fSFred nfs_mark_request_dirty(req); 18869fcd5960STrond Myklebust set_bit(NFS_CONTEXT_RESEND_WRITES, &nfs_req_openctx(req)->flags); 18871da177e4SLinus Torvalds next: 18881d1afcbcSTrond Myklebust nfs_unlock_and_release_request(req); 18897f1bda44STrond Myklebust /* Latency breaker */ 18907f1bda44STrond Myklebust cond_resched(); 18911da177e4SLinus Torvalds } 1892353db796SNeilBrown nfss = NFS_SERVER(data->inode); 1893353db796SNeilBrown if (atomic_long_read(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH) 18940db10944SJan Kara clear_bdi_congested(inode_to_bdi(data->inode), BLK_RW_ASYNC); 1895353db796SNeilBrown 1896f453a54aSFred Isaman nfs_init_cinfo(&cinfo, data->inode, data->dreq); 1897af7cf057STrond Myklebust nfs_commit_end(cinfo.mds); 18985917ce84SFred Isaman } 18995917ce84SFred Isaman 19005917ce84SFred Isaman static void nfs_commit_release(void *calldata) 19015917ce84SFred Isaman { 19020b7c0153SFred Isaman struct nfs_commit_data *data = calldata; 19035917ce84SFred Isaman 1904f453a54aSFred Isaman data->completion_ops->completion(data); 1905c9d8f89dSTrond Myklebust nfs_commitdata_release(calldata); 19061da177e4SLinus Torvalds } 1907788e7a89STrond Myklebust 1908788e7a89STrond Myklebust static const struct rpc_call_ops nfs_commit_ops = { 19090b7c0153SFred Isaman .rpc_call_prepare = nfs_commit_prepare, 1910788e7a89STrond Myklebust .rpc_call_done = nfs_commit_done, 1911788e7a89STrond Myklebust .rpc_release = nfs_commit_release, 1912788e7a89STrond Myklebust }; 19131da177e4SLinus Torvalds 1914f453a54aSFred Isaman static const struct nfs_commit_completion_ops nfs_commit_completion_ops = { 1915f453a54aSFred Isaman .completion = nfs_commit_release_pages, 1916b20135d0STrond Myklebust .resched_write = nfs_commit_resched_write, 1917f453a54aSFred Isaman }; 1918f453a54aSFred Isaman 19191763da12SFred Isaman int nfs_generic_commit_list(struct inode *inode, struct list_head *head, 1920ea2cf228SFred Isaman int how, struct nfs_commit_info *cinfo) 192184c53ab5SFred Isaman { 192284c53ab5SFred Isaman int status; 192384c53ab5SFred Isaman 1924ea2cf228SFred Isaman status = pnfs_commit_list(inode, head, how, cinfo); 192584c53ab5SFred Isaman if (status == PNFS_NOT_ATTEMPTED) 1926ea2cf228SFred Isaman status = nfs_commit_list(inode, head, how, cinfo); 192784c53ab5SFred Isaman return status; 192884c53ab5SFred Isaman } 192984c53ab5SFred Isaman 1930c4f24df9STrond Myklebust static int __nfs_commit_inode(struct inode *inode, int how, 1931c4f24df9STrond Myklebust struct writeback_control *wbc) 19321da177e4SLinus Torvalds { 19331da177e4SLinus Torvalds LIST_HEAD(head); 1934ea2cf228SFred Isaman struct nfs_commit_info cinfo; 193571d0a611STrond Myklebust int may_wait = how & FLUSH_SYNC; 1936c4f24df9STrond Myklebust int ret, nscan; 19371da177e4SLinus Torvalds 1938ea2cf228SFred Isaman nfs_init_cinfo_from_inode(&cinfo, inode); 1939af7cf057STrond Myklebust nfs_commit_begin(cinfo.mds); 1940c4f24df9STrond Myklebust for (;;) { 1941c4f24df9STrond Myklebust ret = nscan = nfs_scan_commit(inode, &head, &cinfo); 1942c4f24df9STrond Myklebust if (ret <= 0) 1943c4f24df9STrond Myklebust break; 1944c4f24df9STrond Myklebust ret = nfs_generic_commit_list(inode, &head, how, &cinfo); 1945c4f24df9STrond Myklebust if (ret < 0) 1946c4f24df9STrond Myklebust break; 1947c4f24df9STrond Myklebust ret = 0; 1948c4f24df9STrond Myklebust if (wbc && wbc->sync_mode == WB_SYNC_NONE) { 1949c4f24df9STrond Myklebust if (nscan < wbc->nr_to_write) 1950c4f24df9STrond Myklebust wbc->nr_to_write -= nscan; 1951c4f24df9STrond Myklebust else 1952c4f24df9STrond Myklebust wbc->nr_to_write = 0; 1953c4f24df9STrond Myklebust } 1954c4f24df9STrond Myklebust if (nscan < INT_MAX) 1955c4f24df9STrond Myklebust break; 1956c4f24df9STrond Myklebust cond_resched(); 1957c4f24df9STrond Myklebust } 1958af7cf057STrond Myklebust nfs_commit_end(cinfo.mds); 1959c4f24df9STrond Myklebust if (ret || !may_wait) 1960c4f24df9STrond Myklebust return ret; 1961c4f24df9STrond Myklebust return wait_on_commit(cinfo.mds); 1962c4f24df9STrond Myklebust } 1963c4f24df9STrond Myklebust 1964c4f24df9STrond Myklebust int nfs_commit_inode(struct inode *inode, int how) 1965c4f24df9STrond Myklebust { 1966c4f24df9STrond Myklebust return __nfs_commit_inode(inode, how, NULL); 19671da177e4SLinus Torvalds } 1968b20135d0STrond Myklebust EXPORT_SYMBOL_GPL(nfs_commit_inode); 19698fc795f7STrond Myklebust 1970ae09c31fSAnna Schumaker int nfs_write_inode(struct inode *inode, struct writeback_control *wbc) 19718fc795f7STrond Myklebust { 1972420e3646STrond Myklebust struct nfs_inode *nfsi = NFS_I(inode); 1973420e3646STrond Myklebust int flags = FLUSH_SYNC; 1974420e3646STrond Myklebust int ret = 0; 19758fc795f7STrond Myklebust 1976c4f24df9STrond Myklebust if (wbc->sync_mode == WB_SYNC_NONE) { 19773236c3e1SJeff Layton /* no commits means nothing needs to be done */ 19785cb953d4STrond Myklebust if (!atomic_long_read(&nfsi->commit_info.ncommit)) 1979c4f24df9STrond Myklebust goto check_requests_outstanding; 19803236c3e1SJeff Layton 1981a00dd6c0SJeff Layton /* Don't commit yet if this is a non-blocking flush and there 1982a00dd6c0SJeff Layton * are a lot of outstanding writes for this mapping. 1983420e3646STrond Myklebust */ 19841a4edf0fSTrond Myklebust if (mapping_tagged(inode->i_mapping, PAGECACHE_TAG_WRITEBACK)) 1985420e3646STrond Myklebust goto out_mark_dirty; 1986420e3646STrond Myklebust 1987a00dd6c0SJeff Layton /* don't wait for the COMMIT response */ 1988420e3646STrond Myklebust flags = 0; 1989a00dd6c0SJeff Layton } 1990a00dd6c0SJeff Layton 1991c4f24df9STrond Myklebust ret = __nfs_commit_inode(inode, flags, wbc); 1992c4f24df9STrond Myklebust if (!ret) { 1993c4f24df9STrond Myklebust if (flags & FLUSH_SYNC) 19948fc795f7STrond Myklebust return 0; 1995c4f24df9STrond Myklebust } else if (atomic_long_read(&nfsi->commit_info.ncommit)) 1996c4f24df9STrond Myklebust goto out_mark_dirty; 1997c4f24df9STrond Myklebust 1998c4f24df9STrond Myklebust check_requests_outstanding: 1999c4f24df9STrond Myklebust if (!atomic_read(&nfsi->commit_info.rpcs_out)) 2000c4f24df9STrond Myklebust return ret; 2001420e3646STrond Myklebust out_mark_dirty: 20028fc795f7STrond Myklebust __mark_inode_dirty(inode, I_DIRTY_DATASYNC); 20038fc795f7STrond Myklebust return ret; 20048fc795f7STrond Myklebust } 200589d77c8fSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_write_inode); 2006863a3c6cSAndy Adamson 2007acdc53b2STrond Myklebust /* 2008837bb1d7STrond Myklebust * Wrapper for filemap_write_and_wait_range() 2009837bb1d7STrond Myklebust * 2010837bb1d7STrond Myklebust * Needed for pNFS in order to ensure data becomes visible to the 2011837bb1d7STrond Myklebust * client. 2012837bb1d7STrond Myklebust */ 2013837bb1d7STrond Myklebust int nfs_filemap_write_and_wait_range(struct address_space *mapping, 2014837bb1d7STrond Myklebust loff_t lstart, loff_t lend) 2015837bb1d7STrond Myklebust { 2016837bb1d7STrond Myklebust int ret; 2017837bb1d7STrond Myklebust 2018837bb1d7STrond Myklebust ret = filemap_write_and_wait_range(mapping, lstart, lend); 2019837bb1d7STrond Myklebust if (ret == 0) 2020837bb1d7STrond Myklebust ret = pnfs_sync_inode(mapping->host, true); 2021837bb1d7STrond Myklebust return ret; 2022837bb1d7STrond Myklebust } 2023837bb1d7STrond Myklebust EXPORT_SYMBOL_GPL(nfs_filemap_write_and_wait_range); 2024837bb1d7STrond Myklebust 2025837bb1d7STrond Myklebust /* 2026acdc53b2STrond Myklebust * flush the inode to disk. 2027acdc53b2STrond Myklebust */ 2028acdc53b2STrond Myklebust int nfs_wb_all(struct inode *inode) 202934901f70STrond Myklebust { 2030f4ce1299STrond Myklebust int ret; 203134901f70STrond Myklebust 2032f4ce1299STrond Myklebust trace_nfs_writeback_inode_enter(inode); 2033f4ce1299STrond Myklebust 20345bb89b47STrond Myklebust ret = filemap_write_and_wait(inode->i_mapping); 20356b196875SChuck Lever if (ret) 20366b196875SChuck Lever goto out; 20375bb89b47STrond Myklebust ret = nfs_commit_inode(inode, FLUSH_SYNC); 20386b196875SChuck Lever if (ret < 0) 20396b196875SChuck Lever goto out; 20405bb89b47STrond Myklebust pnfs_sync_inode(inode, true); 20416b196875SChuck Lever ret = 0; 2042f4ce1299STrond Myklebust 20436b196875SChuck Lever out: 2044f4ce1299STrond Myklebust trace_nfs_writeback_inode_exit(inode, ret); 2045f4ce1299STrond Myklebust return ret; 20461c75950bSTrond Myklebust } 2047ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_wb_all); 20481c75950bSTrond Myklebust 20491b3b4a1aSTrond Myklebust int nfs_wb_page_cancel(struct inode *inode, struct page *page) 20501b3b4a1aSTrond Myklebust { 20511b3b4a1aSTrond Myklebust struct nfs_page *req; 20521b3b4a1aSTrond Myklebust int ret = 0; 20531b3b4a1aSTrond Myklebust 2054ba8b06e6STrond Myklebust wait_on_page_writeback(page); 20553e217045SWeston Andros Adamson 20563e217045SWeston Andros Adamson /* blocking call to cancel all requests and join to a single (head) 20573e217045SWeston Andros Adamson * request */ 20586d17d653STrond Myklebust req = nfs_lock_and_join_requests(page); 20593e217045SWeston Andros Adamson 20603e217045SWeston Andros Adamson if (IS_ERR(req)) { 20613e217045SWeston Andros Adamson ret = PTR_ERR(req); 20623e217045SWeston Andros Adamson } else if (req) { 20633e217045SWeston Andros Adamson /* all requests from this page have been cancelled by 20643e217045SWeston Andros Adamson * nfs_lock_and_join_requests, so just remove the head 20653e217045SWeston Andros Adamson * request from the inode / page_private pointer and 20663e217045SWeston Andros Adamson * release it */ 20671b3b4a1aSTrond Myklebust nfs_inode_remove_request(req); 20681d1afcbcSTrond Myklebust nfs_unlock_and_release_request(req); 20691b3b4a1aSTrond Myklebust } 20703e217045SWeston Andros Adamson 20711b3b4a1aSTrond Myklebust return ret; 20721b3b4a1aSTrond Myklebust } 20731b3b4a1aSTrond Myklebust 20741c75950bSTrond Myklebust /* 20751c75950bSTrond Myklebust * Write back all requests on one page - we do this before reading it. 20761c75950bSTrond Myklebust */ 2077c373fff7STrond Myklebust int nfs_wb_page(struct inode *inode, struct page *page) 20781c75950bSTrond Myklebust { 207929418aa4SMel Gorman loff_t range_start = page_file_offset(page); 208009cbfeafSKirill A. Shutemov loff_t range_end = range_start + (loff_t)(PAGE_SIZE - 1); 20817f2f12d9STrond Myklebust struct writeback_control wbc = { 20827f2f12d9STrond Myklebust .sync_mode = WB_SYNC_ALL, 20837f2f12d9STrond Myklebust .nr_to_write = 0, 20847f2f12d9STrond Myklebust .range_start = range_start, 20857f2f12d9STrond Myklebust .range_end = range_end, 20867f2f12d9STrond Myklebust }; 20877f2f12d9STrond Myklebust int ret; 20887f2f12d9STrond Myklebust 2089f4ce1299STrond Myklebust trace_nfs_writeback_page_enter(inode); 2090f4ce1299STrond Myklebust 20910522f6adSTrond Myklebust for (;;) { 2092ba8b06e6STrond Myklebust wait_on_page_writeback(page); 20937f2f12d9STrond Myklebust if (clear_page_dirty_for_io(page)) { 2094c373fff7STrond Myklebust ret = nfs_writepage_locked(page, &wbc); 20957f2f12d9STrond Myklebust if (ret < 0) 20967f2f12d9STrond Myklebust goto out_error; 20970522f6adSTrond Myklebust continue; 20987f2f12d9STrond Myklebust } 2099f4ce1299STrond Myklebust ret = 0; 21000522f6adSTrond Myklebust if (!PagePrivate(page)) 21010522f6adSTrond Myklebust break; 21020522f6adSTrond Myklebust ret = nfs_commit_inode(inode, FLUSH_SYNC); 21037f2f12d9STrond Myklebust if (ret < 0) 21047f2f12d9STrond Myklebust goto out_error; 21057f2f12d9STrond Myklebust } 21067f2f12d9STrond Myklebust out_error: 2107f4ce1299STrond Myklebust trace_nfs_writeback_page_exit(inode, ret); 21087f2f12d9STrond Myklebust return ret; 21091c75950bSTrond Myklebust } 21101c75950bSTrond Myklebust 2111074cc1deSTrond Myklebust #ifdef CONFIG_MIGRATION 2112074cc1deSTrond Myklebust int nfs_migrate_page(struct address_space *mapping, struct page *newpage, 2113a6bc32b8SMel Gorman struct page *page, enum migrate_mode mode) 2114074cc1deSTrond Myklebust { 21152da95652SJeff Layton /* 21162da95652SJeff Layton * If PagePrivate is set, then the page is currently associated with 21172da95652SJeff Layton * an in-progress read or write request. Don't try to migrate it. 21182da95652SJeff Layton * 21192da95652SJeff Layton * FIXME: we could do this in principle, but we'll need a way to ensure 21202da95652SJeff Layton * that we can safely release the inode reference while holding 21212da95652SJeff Layton * the page lock. 21222da95652SJeff Layton */ 21232da95652SJeff Layton if (PagePrivate(page)) 21242da95652SJeff Layton return -EBUSY; 2125074cc1deSTrond Myklebust 21268c209ce7SDavid Howells if (!nfs_fscache_release_page(page, GFP_KERNEL)) 21278c209ce7SDavid Howells return -EBUSY; 2128074cc1deSTrond Myklebust 2129a6bc32b8SMel Gorman return migrate_page(mapping, newpage, page, mode); 2130074cc1deSTrond Myklebust } 2131074cc1deSTrond Myklebust #endif 2132074cc1deSTrond Myklebust 2133f7b422b1SDavid Howells int __init nfs_init_writepagecache(void) 21341da177e4SLinus Torvalds { 21351da177e4SLinus Torvalds nfs_wdata_cachep = kmem_cache_create("nfs_write_data", 21361e7f3a48SWeston Andros Adamson sizeof(struct nfs_pgio_header), 21371da177e4SLinus Torvalds 0, SLAB_HWCACHE_ALIGN, 213820c2df83SPaul Mundt NULL); 21391da177e4SLinus Torvalds if (nfs_wdata_cachep == NULL) 21401da177e4SLinus Torvalds return -ENOMEM; 21411da177e4SLinus Torvalds 214293d2341cSMatthew Dobson nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE, 21431da177e4SLinus Torvalds nfs_wdata_cachep); 21441da177e4SLinus Torvalds if (nfs_wdata_mempool == NULL) 21453dd4765fSJeff Layton goto out_destroy_write_cache; 21461da177e4SLinus Torvalds 21470b7c0153SFred Isaman nfs_cdata_cachep = kmem_cache_create("nfs_commit_data", 21480b7c0153SFred Isaman sizeof(struct nfs_commit_data), 21490b7c0153SFred Isaman 0, SLAB_HWCACHE_ALIGN, 21500b7c0153SFred Isaman NULL); 21510b7c0153SFred Isaman if (nfs_cdata_cachep == NULL) 21523dd4765fSJeff Layton goto out_destroy_write_mempool; 21530b7c0153SFred Isaman 215493d2341cSMatthew Dobson nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT, 21554c100210SYanchuan Nian nfs_cdata_cachep); 21561da177e4SLinus Torvalds if (nfs_commit_mempool == NULL) 21573dd4765fSJeff Layton goto out_destroy_commit_cache; 21581da177e4SLinus Torvalds 215989a09141SPeter Zijlstra /* 216089a09141SPeter Zijlstra * NFS congestion size, scale with available memory. 216189a09141SPeter Zijlstra * 216289a09141SPeter Zijlstra * 64MB: 8192k 216389a09141SPeter Zijlstra * 128MB: 11585k 216489a09141SPeter Zijlstra * 256MB: 16384k 216589a09141SPeter Zijlstra * 512MB: 23170k 216689a09141SPeter Zijlstra * 1GB: 32768k 216789a09141SPeter Zijlstra * 2GB: 46340k 216889a09141SPeter Zijlstra * 4GB: 65536k 216989a09141SPeter Zijlstra * 8GB: 92681k 217089a09141SPeter Zijlstra * 16GB: 131072k 217189a09141SPeter Zijlstra * 217289a09141SPeter Zijlstra * This allows larger machines to have larger/more transfers. 217389a09141SPeter Zijlstra * Limit the default to 256M 217489a09141SPeter Zijlstra */ 2175ca79b0c2SArun KS nfs_congestion_kb = (16*int_sqrt(totalram_pages())) << (PAGE_SHIFT-10); 217689a09141SPeter Zijlstra if (nfs_congestion_kb > 256*1024) 217789a09141SPeter Zijlstra nfs_congestion_kb = 256*1024; 217889a09141SPeter Zijlstra 21791da177e4SLinus Torvalds return 0; 21803dd4765fSJeff Layton 21813dd4765fSJeff Layton out_destroy_commit_cache: 21823dd4765fSJeff Layton kmem_cache_destroy(nfs_cdata_cachep); 21833dd4765fSJeff Layton out_destroy_write_mempool: 21843dd4765fSJeff Layton mempool_destroy(nfs_wdata_mempool); 21853dd4765fSJeff Layton out_destroy_write_cache: 21863dd4765fSJeff Layton kmem_cache_destroy(nfs_wdata_cachep); 21873dd4765fSJeff Layton return -ENOMEM; 21881da177e4SLinus Torvalds } 21891da177e4SLinus Torvalds 2190266bee88SDavid Brownell void nfs_destroy_writepagecache(void) 21911da177e4SLinus Torvalds { 21921da177e4SLinus Torvalds mempool_destroy(nfs_commit_mempool); 21933dd4765fSJeff Layton kmem_cache_destroy(nfs_cdata_cachep); 21941da177e4SLinus Torvalds mempool_destroy(nfs_wdata_mempool); 21951a1d92c1SAlexey Dobriyan kmem_cache_destroy(nfs_wdata_cachep); 21961da177e4SLinus Torvalds } 21971da177e4SLinus Torvalds 21984a0de55cSAnna Schumaker static const struct nfs_rw_ops nfs_rw_write_ops = { 21994a0de55cSAnna Schumaker .rw_alloc_header = nfs_writehdr_alloc, 22004a0de55cSAnna Schumaker .rw_free_header = nfs_writehdr_free, 22010eecb214SAnna Schumaker .rw_done = nfs_writeback_done, 22020eecb214SAnna Schumaker .rw_result = nfs_writeback_result, 22031ed26f33SAnna Schumaker .rw_initiate = nfs_initiate_write, 22044a0de55cSAnna Schumaker }; 2205