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; 291*110cb2d2SChuck Lever trace_nfs_size_grow(inode, end); 2921da177e4SLinus Torvalds i_size_write(inode, end); 293f6cdfa6dSTrond Myklebust NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_SIZE; 294a3d01454STrond Myklebust nfs_inc_stats(inode, NFSIOS_EXTENDWRITE); 295a3d01454STrond Myklebust out: 296a3d01454STrond Myklebust spin_unlock(&inode->i_lock); 2971da177e4SLinus Torvalds } 2981da177e4SLinus Torvalds 299a301b777STrond Myklebust /* A writeback failed: mark the page as bad, and invalidate the page cache */ 300d2ceb7e5SBenjamin Coddington static void nfs_set_pageerror(struct address_space *mapping) 301a301b777STrond Myklebust { 3020df68cedSTrond Myklebust struct inode *inode = mapping->host; 3030df68cedSTrond Myklebust 304d2ceb7e5SBenjamin Coddington nfs_zap_mapping(mapping->host, mapping); 3050df68cedSTrond Myklebust /* Force file size revalidation */ 3060df68cedSTrond Myklebust spin_lock(&inode->i_lock); 307ac46b3d7STrond Myklebust nfs_set_cache_invalid(inode, NFS_INO_REVAL_FORCED | 3080df68cedSTrond Myklebust NFS_INO_REVAL_PAGECACHE | 309ac46b3d7STrond Myklebust NFS_INO_INVALID_SIZE); 3100df68cedSTrond Myklebust spin_unlock(&inode->i_lock); 311a301b777STrond Myklebust } 312a301b777STrond Myklebust 3136fbda89bSTrond Myklebust static void nfs_mapping_set_error(struct page *page, int error) 3146fbda89bSTrond Myklebust { 315b8946d7bSTrond Myklebust struct address_space *mapping = page_file_mapping(page); 316b8946d7bSTrond Myklebust 3176fbda89bSTrond Myklebust SetPageError(page); 318b8946d7bSTrond Myklebust mapping_set_error(mapping, error); 319b8946d7bSTrond Myklebust nfs_set_pageerror(mapping); 3206fbda89bSTrond Myklebust } 3216fbda89bSTrond Myklebust 322d72ddcbaSWeston Andros Adamson /* 323d72ddcbaSWeston Andros Adamson * nfs_page_group_search_locked 324d72ddcbaSWeston Andros Adamson * @head - head request of page group 325d72ddcbaSWeston Andros Adamson * @page_offset - offset into page 326d72ddcbaSWeston Andros Adamson * 327d72ddcbaSWeston Andros Adamson * Search page group with head @head to find a request that contains the 328d72ddcbaSWeston Andros Adamson * page offset @page_offset. 329d72ddcbaSWeston Andros Adamson * 330d72ddcbaSWeston Andros Adamson * Returns a pointer to the first matching nfs request, or NULL if no 331d72ddcbaSWeston Andros Adamson * match is found. 332d72ddcbaSWeston Andros Adamson * 333d72ddcbaSWeston Andros Adamson * Must be called with the page group lock held 334d72ddcbaSWeston Andros Adamson */ 335d72ddcbaSWeston Andros Adamson static struct nfs_page * 336d72ddcbaSWeston Andros Adamson nfs_page_group_search_locked(struct nfs_page *head, unsigned int page_offset) 337d72ddcbaSWeston Andros Adamson { 338d72ddcbaSWeston Andros Adamson struct nfs_page *req; 339d72ddcbaSWeston Andros Adamson 340d72ddcbaSWeston Andros Adamson req = head; 341d72ddcbaSWeston Andros Adamson do { 342d72ddcbaSWeston Andros Adamson if (page_offset >= req->wb_pgbase && 343d72ddcbaSWeston Andros Adamson page_offset < (req->wb_pgbase + req->wb_bytes)) 344d72ddcbaSWeston Andros Adamson return req; 345d72ddcbaSWeston Andros Adamson 346d72ddcbaSWeston Andros Adamson req = req->wb_this_page; 347d72ddcbaSWeston Andros Adamson } while (req != head); 348d72ddcbaSWeston Andros Adamson 349d72ddcbaSWeston Andros Adamson return NULL; 350d72ddcbaSWeston Andros Adamson } 351d72ddcbaSWeston Andros Adamson 352d72ddcbaSWeston Andros Adamson /* 353d72ddcbaSWeston Andros Adamson * nfs_page_group_covers_page 354d72ddcbaSWeston Andros Adamson * @head - head request of page group 355d72ddcbaSWeston Andros Adamson * 356d72ddcbaSWeston Andros Adamson * Return true if the page group with head @head covers the whole page, 357d72ddcbaSWeston Andros Adamson * returns false otherwise 358d72ddcbaSWeston Andros Adamson */ 359d72ddcbaSWeston Andros Adamson static bool nfs_page_group_covers_page(struct nfs_page *req) 360d72ddcbaSWeston Andros Adamson { 361d72ddcbaSWeston Andros Adamson struct nfs_page *tmp; 362d72ddcbaSWeston Andros Adamson unsigned int pos = 0; 363d72ddcbaSWeston Andros Adamson unsigned int len = nfs_page_length(req->wb_page); 364d72ddcbaSWeston Andros Adamson 3651344b7eaSTrond Myklebust nfs_page_group_lock(req); 366d72ddcbaSWeston Andros Adamson 3677e8a30f8STrond Myklebust for (;;) { 368d72ddcbaSWeston Andros Adamson tmp = nfs_page_group_search_locked(req->wb_head, pos); 3697e8a30f8STrond Myklebust if (!tmp) 3707e8a30f8STrond Myklebust break; 3717e8a30f8STrond Myklebust pos = tmp->wb_pgbase + tmp->wb_bytes; 372d72ddcbaSWeston Andros Adamson } 373d72ddcbaSWeston Andros Adamson 374d72ddcbaSWeston Andros Adamson nfs_page_group_unlock(req); 3757e8a30f8STrond Myklebust return pos >= len; 376d72ddcbaSWeston Andros Adamson } 377d72ddcbaSWeston Andros Adamson 3781da177e4SLinus Torvalds /* We can set the PG_uptodate flag if we see that a write request 3791da177e4SLinus Torvalds * covers the full page. 3801da177e4SLinus Torvalds */ 381d72ddcbaSWeston Andros Adamson static void nfs_mark_uptodate(struct nfs_page *req) 3821da177e4SLinus Torvalds { 383d72ddcbaSWeston Andros Adamson if (PageUptodate(req->wb_page)) 3841da177e4SLinus Torvalds return; 385d72ddcbaSWeston Andros Adamson if (!nfs_page_group_covers_page(req)) 3861da177e4SLinus Torvalds return; 387d72ddcbaSWeston Andros Adamson SetPageUptodate(req->wb_page); 3881da177e4SLinus Torvalds } 3891da177e4SLinus Torvalds 3901da177e4SLinus Torvalds static int wb_priority(struct writeback_control *wbc) 3911da177e4SLinus Torvalds { 392e87b4c7aSNeilBrown int ret = 0; 393cca588d6STrond Myklebust 394e87b4c7aSNeilBrown if (wbc->sync_mode == WB_SYNC_ALL) 395e87b4c7aSNeilBrown ret = FLUSH_COND_STABLE; 396e87b4c7aSNeilBrown return ret; 3971da177e4SLinus Torvalds } 3981da177e4SLinus Torvalds 3991da177e4SLinus Torvalds /* 40089a09141SPeter Zijlstra * NFS congestion control 40189a09141SPeter Zijlstra */ 40289a09141SPeter Zijlstra 40389a09141SPeter Zijlstra int nfs_congestion_kb; 40489a09141SPeter Zijlstra 40589a09141SPeter Zijlstra #define NFS_CONGESTION_ON_THRESH (nfs_congestion_kb >> (PAGE_SHIFT-10)) 40689a09141SPeter Zijlstra #define NFS_CONGESTION_OFF_THRESH \ 40789a09141SPeter Zijlstra (NFS_CONGESTION_ON_THRESH - (NFS_CONGESTION_ON_THRESH >> 2)) 40889a09141SPeter Zijlstra 409deed85e7STrond Myklebust static void nfs_set_page_writeback(struct page *page) 41089a09141SPeter Zijlstra { 4110db10944SJan Kara struct inode *inode = page_file_mapping(page)->host; 4120db10944SJan Kara struct nfs_server *nfss = NFS_SERVER(inode); 4135a6d41b3STrond Myklebust int ret = test_set_page_writeback(page); 4145a6d41b3STrond Myklebust 415deed85e7STrond Myklebust WARN_ON_ONCE(ret != 0); 41689a09141SPeter Zijlstra 417277866a0SPeter Zijlstra if (atomic_long_inc_return(&nfss->writeback) > 4180db10944SJan Kara NFS_CONGESTION_ON_THRESH) 4190db10944SJan Kara set_bdi_congested(inode_to_bdi(inode), BLK_RW_ASYNC); 42089a09141SPeter Zijlstra } 42189a09141SPeter Zijlstra 42220633f04SWeston Andros Adamson static void nfs_end_page_writeback(struct nfs_page *req) 42389a09141SPeter Zijlstra { 42420633f04SWeston Andros Adamson struct inode *inode = page_file_mapping(req->wb_page)->host; 42589a09141SPeter Zijlstra struct nfs_server *nfss = NFS_SERVER(inode); 42631a01f09STrond Myklebust bool is_done; 42789a09141SPeter Zijlstra 42831a01f09STrond Myklebust is_done = nfs_page_group_sync_on_bit(req, PG_WB_END); 42931a01f09STrond Myklebust nfs_unlock_request(req); 43031a01f09STrond Myklebust if (!is_done) 43120633f04SWeston Andros Adamson return; 43220633f04SWeston Andros Adamson 43320633f04SWeston Andros Adamson end_page_writeback(req->wb_page); 434c4dc4beeSPeter Zijlstra if (atomic_long_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH) 4350db10944SJan Kara clear_bdi_congested(inode_to_bdi(inode), BLK_RW_ASYNC); 43689a09141SPeter Zijlstra } 43789a09141SPeter Zijlstra 438d4581383SWeston Andros Adamson /* 439d4581383SWeston Andros Adamson * nfs_destroy_unlinked_subrequests - destroy recently unlinked subrequests 440d4581383SWeston Andros Adamson * 441d4581383SWeston Andros Adamson * @destroy_list - request list (using wb_this_page) terminated by @old_head 442d4581383SWeston Andros Adamson * @old_head - the old head of the list 443d4581383SWeston Andros Adamson * 444d4581383SWeston Andros Adamson * All subrequests must be locked and removed from all lists, so at this point 445d4581383SWeston Andros Adamson * they are only "active" in this function, and possibly in nfs_wait_on_request 446d4581383SWeston Andros Adamson * with a reference held by some other context. 447d4581383SWeston Andros Adamson */ 448d4581383SWeston Andros Adamson static void 449d4581383SWeston Andros Adamson nfs_destroy_unlinked_subrequests(struct nfs_page *destroy_list, 450b66aaa8dSTrond Myklebust struct nfs_page *old_head, 451b66aaa8dSTrond Myklebust struct inode *inode) 452d4581383SWeston Andros Adamson { 453d4581383SWeston Andros Adamson while (destroy_list) { 454d4581383SWeston Andros Adamson struct nfs_page *subreq = destroy_list; 455d4581383SWeston Andros Adamson 456d4581383SWeston Andros Adamson destroy_list = (subreq->wb_this_page == old_head) ? 457d4581383SWeston Andros Adamson NULL : subreq->wb_this_page; 458d4581383SWeston Andros Adamson 45908ca8b21STrond Myklebust /* Note: lock subreq in order to change subreq->wb_head */ 46008ca8b21STrond Myklebust nfs_page_set_headlock(subreq); 461d4581383SWeston Andros Adamson WARN_ON_ONCE(old_head != subreq->wb_head); 462d4581383SWeston Andros Adamson 463d4581383SWeston Andros Adamson /* make sure old group is not used */ 464d4581383SWeston Andros Adamson subreq->wb_this_page = subreq; 46508ca8b21STrond Myklebust subreq->wb_head = subreq; 466d4581383SWeston Andros Adamson 467902a4c00STrond Myklebust clear_bit(PG_REMOVE, &subreq->wb_flags); 468902a4c00STrond Myklebust 4695b2b5187STrond Myklebust /* Note: races with nfs_page_group_destroy() */ 4705b2b5187STrond Myklebust if (!kref_read(&subreq->wb_kref)) { 4715b2b5187STrond Myklebust /* Check if we raced with nfs_page_group_destroy() */ 47208ca8b21STrond Myklebust if (test_and_clear_bit(PG_TEARDOWN, &subreq->wb_flags)) { 47308ca8b21STrond Myklebust nfs_page_clear_headlock(subreq); 4745b2b5187STrond Myklebust nfs_free_request(subreq); 47508ca8b21STrond Myklebust } else 47608ca8b21STrond Myklebust nfs_page_clear_headlock(subreq); 4775b2b5187STrond Myklebust continue; 4785b2b5187STrond Myklebust } 47908ca8b21STrond Myklebust nfs_page_clear_headlock(subreq); 480d4581383SWeston Andros Adamson 481add42de3STrond Myklebust nfs_release_request(old_head); 4825b2b5187STrond Myklebust 483b66aaa8dSTrond Myklebust if (test_and_clear_bit(PG_INODE_REF, &subreq->wb_flags)) { 484d4581383SWeston Andros Adamson nfs_release_request(subreq); 485a6b6d5b8STrond Myklebust atomic_long_dec(&NFS_I(inode)->nrequests); 486d4581383SWeston Andros Adamson } 4875b2b5187STrond Myklebust 4885b2b5187STrond Myklebust /* subreq is now totally disconnected from page group or any 4895b2b5187STrond Myklebust * write / commit lists. last chance to wake any waiters */ 4905b2b5187STrond Myklebust nfs_unlock_and_release_request(subreq); 491d4581383SWeston Andros Adamson } 492d4581383SWeston Andros Adamson } 493d4581383SWeston Andros Adamson 494d4581383SWeston Andros Adamson /* 495e00ed89dSTrond Myklebust * nfs_join_page_group - destroy subrequests of the head req 496e00ed89dSTrond Myklebust * @head: the page used to lookup the "page group" of nfs_page structures 497e00ed89dSTrond Myklebust * @inode: Inode to which the request belongs. 498d4581383SWeston Andros Adamson * 499d4581383SWeston Andros Adamson * This function joins all sub requests to the head request by first 500d4581383SWeston Andros Adamson * locking all requests in the group, cancelling any pending operations 501d4581383SWeston Andros Adamson * and finally updating the head request to cover the whole range covered by 502d4581383SWeston Andros Adamson * the (former) group. All subrequests are removed from any write or commit 503d4581383SWeston Andros Adamson * lists, unlinked from the group and destroyed. 504d4581383SWeston Andros Adamson */ 505ed5d588fSTrond Myklebust void 506e00ed89dSTrond Myklebust nfs_join_page_group(struct nfs_page *head, struct inode *inode) 507d4581383SWeston Andros Adamson { 508e00ed89dSTrond Myklebust struct nfs_page *subreq; 509d4581383SWeston Andros Adamson struct nfs_page *destroy_list = NULL; 510a62f8e3bSTrond Myklebust unsigned int pgbase, off, bytes; 511a62f8e3bSTrond Myklebust 512a62f8e3bSTrond Myklebust pgbase = head->wb_pgbase; 513a62f8e3bSTrond Myklebust bytes = head->wb_bytes; 514a62f8e3bSTrond Myklebust off = head->wb_offset; 515a0e265bcSTrond Myklebust for (subreq = head->wb_this_page; subreq != head; 516a0e265bcSTrond Myklebust subreq = subreq->wb_this_page) { 517a62f8e3bSTrond Myklebust /* Subrequests should always form a contiguous range */ 518a62f8e3bSTrond Myklebust if (pgbase > subreq->wb_pgbase) { 519a62f8e3bSTrond Myklebust off -= pgbase - subreq->wb_pgbase; 520a62f8e3bSTrond Myklebust bytes += pgbase - subreq->wb_pgbase; 521a62f8e3bSTrond Myklebust pgbase = subreq->wb_pgbase; 522a62f8e3bSTrond Myklebust } 523a62f8e3bSTrond Myklebust bytes = max(subreq->wb_pgbase + subreq->wb_bytes 524a62f8e3bSTrond Myklebust - pgbase, bytes); 5251bd5d6d0STrond Myklebust } 5261bd5d6d0STrond Myklebust 527a62f8e3bSTrond Myklebust /* Set the head request's range to cover the former page group */ 528a62f8e3bSTrond Myklebust head->wb_pgbase = pgbase; 529a62f8e3bSTrond Myklebust head->wb_bytes = bytes; 530a62f8e3bSTrond Myklebust head->wb_offset = off; 531d4581383SWeston Andros Adamson 532d4581383SWeston Andros Adamson /* Now that all requests are locked, make sure they aren't on any list. 533d4581383SWeston Andros Adamson * Commit list removal accounting is done after locks are dropped */ 534d4581383SWeston Andros Adamson subreq = head; 535d4581383SWeston Andros Adamson do { 536411a99adSWeston Andros Adamson nfs_clear_request_commit(subreq); 537d4581383SWeston Andros Adamson subreq = subreq->wb_this_page; 538d4581383SWeston Andros Adamson } while (subreq != head); 539d4581383SWeston Andros Adamson 540d4581383SWeston Andros Adamson /* unlink subrequests from head, destroy them later */ 541d4581383SWeston Andros Adamson if (head->wb_this_page != head) { 542d4581383SWeston Andros Adamson /* destroy list will be terminated by head */ 543d4581383SWeston Andros Adamson destroy_list = head->wb_this_page; 544d4581383SWeston Andros Adamson head->wb_this_page = head; 545d4581383SWeston Andros Adamson } 546d4581383SWeston Andros Adamson 547b66aaa8dSTrond Myklebust nfs_destroy_unlinked_subrequests(destroy_list, head, inode); 548b5bab9bfSTrond Myklebust } 549b5bab9bfSTrond Myklebust 550e00ed89dSTrond Myklebust /* 551e00ed89dSTrond Myklebust * nfs_lock_and_join_requests - join all subreqs to the head req 552e00ed89dSTrond Myklebust * @page: the page used to lookup the "page group" of nfs_page structures 553e00ed89dSTrond Myklebust * 554e00ed89dSTrond Myklebust * This function joins all sub requests to the head request by first 555e00ed89dSTrond Myklebust * locking all requests in the group, cancelling any pending operations 556e00ed89dSTrond Myklebust * and finally updating the head request to cover the whole range covered by 557e00ed89dSTrond Myklebust * the (former) group. All subrequests are removed from any write or commit 558e00ed89dSTrond Myklebust * lists, unlinked from the group and destroyed. 559e00ed89dSTrond Myklebust * 560e00ed89dSTrond Myklebust * Returns a locked, referenced pointer to the head request - which after 561e00ed89dSTrond Myklebust * this call is guaranteed to be the only request associated with the page. 562e00ed89dSTrond Myklebust * Returns NULL if no requests are found for @page, or a ERR_PTR if an 563e00ed89dSTrond Myklebust * error was encountered. 564e00ed89dSTrond Myklebust */ 565e00ed89dSTrond Myklebust static struct nfs_page * 566e00ed89dSTrond Myklebust nfs_lock_and_join_requests(struct page *page) 567e00ed89dSTrond Myklebust { 568e00ed89dSTrond Myklebust struct inode *inode = page_file_mapping(page)->host; 569e00ed89dSTrond Myklebust struct nfs_page *head; 570e00ed89dSTrond Myklebust int ret; 571e00ed89dSTrond Myklebust 572e00ed89dSTrond Myklebust /* 573e00ed89dSTrond Myklebust * A reference is taken only on the head request which acts as a 574e00ed89dSTrond Myklebust * reference to the whole page group - the group will not be destroyed 575e00ed89dSTrond Myklebust * until the head reference is released. 576e00ed89dSTrond Myklebust */ 577e00ed89dSTrond Myklebust head = nfs_find_and_lock_page_request(page); 578e00ed89dSTrond Myklebust if (IS_ERR_OR_NULL(head)) 579d4581383SWeston Andros Adamson return head; 5800671d8f1SMarkus Elfring 581e00ed89dSTrond Myklebust /* lock each request in the page group */ 582e00ed89dSTrond Myklebust ret = nfs_page_group_lock_subrequests(head); 583e00ed89dSTrond Myklebust if (ret < 0) { 5840671d8f1SMarkus Elfring nfs_unlock_and_release_request(head); 5850671d8f1SMarkus Elfring return ERR_PTR(ret); 586612c9384STrond Myklebust } 587074cc1deSTrond Myklebust 588e00ed89dSTrond Myklebust nfs_join_page_group(head, inode); 589e00ed89dSTrond Myklebust 590e00ed89dSTrond Myklebust return head; 591e00ed89dSTrond Myklebust } 592e00ed89dSTrond Myklebust 5936fbda89bSTrond Myklebust static void nfs_write_error(struct nfs_page *req, int error) 5940bcbf039SPeng Tao { 595861e1671SChuck Lever trace_nfs_write_error(req, error); 5966fbda89bSTrond Myklebust nfs_mapping_set_error(req->wb_page, error); 59706c9fdf3STrond Myklebust nfs_inode_remove_request(req); 5980bcbf039SPeng Tao nfs_end_page_writeback(req); 5991f84ccdfSFred Isaman nfs_release_request(req); 6000bcbf039SPeng Tao } 6010bcbf039SPeng Tao 602074cc1deSTrond Myklebust /* 603074cc1deSTrond Myklebust * Find an associated nfs write request, and prepare to flush it out 604074cc1deSTrond Myklebust * May return an error if the user signalled nfs_wait_on_request(). 605074cc1deSTrond Myklebust */ 606074cc1deSTrond Myklebust static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio, 6076d17d653STrond Myklebust struct page *page) 608074cc1deSTrond Myklebust { 609074cc1deSTrond Myklebust struct nfs_page *req; 610074cc1deSTrond Myklebust int ret = 0; 611074cc1deSTrond Myklebust 6126d17d653STrond Myklebust req = nfs_lock_and_join_requests(page); 613074cc1deSTrond Myklebust if (!req) 614074cc1deSTrond Myklebust goto out; 615074cc1deSTrond Myklebust ret = PTR_ERR(req); 616074cc1deSTrond Myklebust if (IS_ERR(req)) 617074cc1deSTrond Myklebust goto out; 618074cc1deSTrond Myklebust 619deed85e7STrond Myklebust nfs_set_page_writeback(page); 620deed85e7STrond Myklebust WARN_ON_ONCE(test_bit(PG_CLEAN, &req->wb_flags)); 621074cc1deSTrond Myklebust 622a6598813STrond Myklebust /* If there is a fatal error that covers this write, just exit */ 62396c41455STrond Myklebust ret = pgio->pg_error; 62496c41455STrond Myklebust if (nfs_error_is_fatal_on_server(ret)) 625a6598813STrond Myklebust goto out_launder; 626a6598813STrond Myklebust 62796c41455STrond Myklebust ret = 0; 628f8512ad0SFred Isaman if (!nfs_pageio_add_request(pgio, req)) { 629074cc1deSTrond Myklebust ret = pgio->pg_error; 6300bcbf039SPeng Tao /* 631c373fff7STrond Myklebust * Remove the problematic req upon fatal errors on the server 6320bcbf039SPeng Tao */ 6330bcbf039SPeng Tao if (nfs_error_is_fatal(ret)) { 634c373fff7STrond Myklebust if (nfs_error_is_fatal_on_server(ret)) 635a6598813STrond Myklebust goto out_launder; 6368fc75bedSTrond Myklebust } else 6370bcbf039SPeng Tao ret = -EAGAIN; 6388fc75bedSTrond Myklebust nfs_redirty_request(req); 63996c41455STrond Myklebust pgio->pg_error = 0; 64040f90271STrond Myklebust } else 64140f90271STrond Myklebust nfs_add_stats(page_file_mapping(page)->host, 64240f90271STrond Myklebust NFSIOS_WRITEPAGES, 1); 643074cc1deSTrond Myklebust out: 644074cc1deSTrond Myklebust return ret; 645a6598813STrond Myklebust out_launder: 6466fbda89bSTrond Myklebust nfs_write_error(req, ret); 64714bebe3cSTrond Myklebust return 0; 648e261f51fSTrond Myklebust } 649e261f51fSTrond Myklebust 650d6c843b9SPeng Tao static int nfs_do_writepage(struct page *page, struct writeback_control *wbc, 651c373fff7STrond Myklebust struct nfs_pageio_descriptor *pgio) 652f758c885STrond Myklebust { 653cfb506e1STrond Myklebust int ret; 654f758c885STrond Myklebust 6558cd79788SHuang Ying nfs_pageio_cond_complete(pgio, page_index(page)); 6566d17d653STrond Myklebust ret = nfs_page_async_flush(pgio, page); 657cfb506e1STrond Myklebust if (ret == -EAGAIN) { 658cfb506e1STrond Myklebust redirty_page_for_writepage(wbc, page); 65996c41455STrond Myklebust ret = AOP_WRITEPAGE_ACTIVATE; 660cfb506e1STrond Myklebust } 661cfb506e1STrond Myklebust return ret; 662f758c885STrond Myklebust } 663f758c885STrond Myklebust 664e261f51fSTrond Myklebust /* 6651da177e4SLinus Torvalds * Write an mmapped page to the server. 6661da177e4SLinus Torvalds */ 667d6c843b9SPeng Tao static int nfs_writepage_locked(struct page *page, 668c373fff7STrond Myklebust struct writeback_control *wbc) 6691da177e4SLinus Torvalds { 670f758c885STrond Myklebust struct nfs_pageio_descriptor pgio; 67140f90271STrond Myklebust struct inode *inode = page_file_mapping(page)->host; 672e261f51fSTrond Myklebust int err; 6731da177e4SLinus Torvalds 67440f90271STrond Myklebust nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE); 675811ed92eSTrond Myklebust nfs_pageio_init_write(&pgio, inode, 0, 676a20c93e3SChristoph Hellwig false, &nfs_async_write_completion_ops); 677c373fff7STrond Myklebust err = nfs_do_writepage(page, wbc, &pgio); 67896c41455STrond Myklebust pgio.pg_error = 0; 679f758c885STrond Myklebust nfs_pageio_complete(&pgio); 680f758c885STrond Myklebust if (err < 0) 6814d770ccfSTrond Myklebust return err; 68296c41455STrond Myklebust if (nfs_error_is_fatal(pgio.pg_error)) 683f758c885STrond Myklebust return pgio.pg_error; 684f758c885STrond Myklebust return 0; 6854d770ccfSTrond Myklebust } 6864d770ccfSTrond Myklebust 6874d770ccfSTrond Myklebust int nfs_writepage(struct page *page, struct writeback_control *wbc) 6884d770ccfSTrond Myklebust { 689f758c885STrond Myklebust int ret; 6904d770ccfSTrond Myklebust 691c373fff7STrond Myklebust ret = nfs_writepage_locked(page, wbc); 69296c41455STrond Myklebust if (ret != AOP_WRITEPAGE_ACTIVATE) 6931da177e4SLinus Torvalds unlock_page(page); 694f758c885STrond Myklebust return ret; 695f758c885STrond Myklebust } 696f758c885STrond Myklebust 697f758c885STrond Myklebust static int nfs_writepages_callback(struct page *page, struct writeback_control *wbc, void *data) 698f758c885STrond Myklebust { 699f758c885STrond Myklebust int ret; 700f758c885STrond Myklebust 701c373fff7STrond Myklebust ret = nfs_do_writepage(page, wbc, data); 70296c41455STrond Myklebust if (ret != AOP_WRITEPAGE_ACTIVATE) 703f758c885STrond Myklebust unlock_page(page); 704f758c885STrond Myklebust return ret; 7051da177e4SLinus Torvalds } 7061da177e4SLinus Torvalds 707919e3bd9STrond Myklebust static void nfs_io_completion_commit(void *inode) 708919e3bd9STrond Myklebust { 709919e3bd9STrond Myklebust nfs_commit_inode(inode, 0); 710919e3bd9STrond Myklebust } 711919e3bd9STrond Myklebust 7121da177e4SLinus Torvalds int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc) 7131da177e4SLinus Torvalds { 7141da177e4SLinus Torvalds struct inode *inode = mapping->host; 715c63c7b05STrond Myklebust struct nfs_pageio_descriptor pgio; 716ed7bcdb3STrond Myklebust struct nfs_io_completion *ioc = NULL; 717ed7bcdb3STrond Myklebust unsigned int mntflags = NFS_SERVER(inode)->flags; 718ed7bcdb3STrond Myklebust int priority = 0; 7191da177e4SLinus Torvalds int err; 7201da177e4SLinus Torvalds 72191d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES); 72291d5b470SChuck Lever 723ed7bcdb3STrond Myklebust if (!(mntflags & NFS_MOUNT_WRITE_EAGER) || wbc->for_kupdate || 724ed7bcdb3STrond Myklebust wbc->for_background || wbc->for_sync || wbc->for_reclaim) { 7252b17d725STrond Myklebust ioc = nfs_io_completion_alloc(GFP_KERNEL); 726919e3bd9STrond Myklebust if (ioc) 727ed7bcdb3STrond Myklebust nfs_io_completion_init(ioc, nfs_io_completion_commit, 728ed7bcdb3STrond Myklebust inode); 729ed7bcdb3STrond Myklebust priority = wb_priority(wbc); 730ed7bcdb3STrond Myklebust } 731919e3bd9STrond Myklebust 732ed7bcdb3STrond Myklebust nfs_pageio_init_write(&pgio, inode, priority, false, 733a20c93e3SChristoph Hellwig &nfs_async_write_completion_ops); 734919e3bd9STrond Myklebust pgio.pg_io_completion = ioc; 735f758c885STrond Myklebust err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio); 73696c41455STrond Myklebust pgio.pg_error = 0; 737c63c7b05STrond Myklebust nfs_pageio_complete(&pgio); 738919e3bd9STrond Myklebust nfs_io_completion_put(ioc); 73972cb77f4STrond Myklebust 740f758c885STrond Myklebust if (err < 0) 74172cb77f4STrond Myklebust goto out_err; 74272cb77f4STrond Myklebust err = pgio.pg_error; 74396c41455STrond Myklebust if (nfs_error_is_fatal(err)) 74472cb77f4STrond Myklebust goto out_err; 745c63c7b05STrond Myklebust return 0; 74672cb77f4STrond Myklebust out_err: 74772cb77f4STrond Myklebust return err; 7481da177e4SLinus Torvalds } 7491da177e4SLinus Torvalds 7501da177e4SLinus Torvalds /* 7511da177e4SLinus Torvalds * Insert a write request into an inode 7521da177e4SLinus Torvalds */ 753d6d6dc7cSFred Isaman static void nfs_inode_add_request(struct inode *inode, struct nfs_page *req) 7541da177e4SLinus Torvalds { 7554b9bb25bSTrond Myklebust struct address_space *mapping = page_file_mapping(req->wb_page); 7561da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 757e7d39069STrond Myklebust 7582bfc6e56SWeston Andros Adamson WARN_ON_ONCE(req->wb_this_page != req); 7592bfc6e56SWeston Andros Adamson 760e7d39069STrond Myklebust /* Lock the request! */ 7617ad84aa9STrond Myklebust nfs_lock_request(req); 762e7d39069STrond Myklebust 76329418aa4SMel Gorman /* 76429418aa4SMel Gorman * Swap-space should not get truncated. Hence no need to plug the race 76529418aa4SMel Gorman * with invalidate/truncate. 76629418aa4SMel Gorman */ 7674b9bb25bSTrond Myklebust spin_lock(&mapping->private_lock); 76829418aa4SMel Gorman if (likely(!PageSwapCache(req->wb_page))) { 7692df485a7STrond Myklebust set_bit(PG_MAPPED, &req->wb_flags); 770deb7d638STrond Myklebust SetPagePrivate(req->wb_page); 771277459d2STrond Myklebust set_page_private(req->wb_page, (unsigned long)req); 77229418aa4SMel Gorman } 7734b9bb25bSTrond Myklebust spin_unlock(&mapping->private_lock); 774a6b6d5b8STrond Myklebust atomic_long_inc(&nfsi->nrequests); 77517089a29SWeston Andros Adamson /* this a head request for a page group - mark it as having an 776cb1410c7SWeston Andros Adamson * extra reference so sub groups can follow suit. 777cb1410c7SWeston Andros Adamson * This flag also informs pgio layer when to bump nrequests when 778cb1410c7SWeston Andros Adamson * adding subrequests. */ 77917089a29SWeston Andros Adamson WARN_ON(test_and_set_bit(PG_INODE_REF, &req->wb_flags)); 780c03b4024STrond Myklebust kref_get(&req->wb_kref); 7811da177e4SLinus Torvalds } 7821da177e4SLinus Torvalds 7831da177e4SLinus Torvalds /* 78489a09141SPeter Zijlstra * Remove a write request from an inode 7851da177e4SLinus Torvalds */ 7861da177e4SLinus Torvalds static void nfs_inode_remove_request(struct nfs_page *req) 7871da177e4SLinus Torvalds { 7884b9bb25bSTrond Myklebust struct address_space *mapping = page_file_mapping(req->wb_page); 7894b9bb25bSTrond Myklebust struct inode *inode = mapping->host; 7901da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 79120633f04SWeston Andros Adamson struct nfs_page *head; 79220633f04SWeston Andros Adamson 79320633f04SWeston Andros Adamson if (nfs_page_group_sync_on_bit(req, PG_REMOVE)) { 79420633f04SWeston Andros Adamson head = req->wb_head; 7951da177e4SLinus Torvalds 7964b9bb25bSTrond Myklebust spin_lock(&mapping->private_lock); 79767911c8fSAnna Schumaker if (likely(head->wb_page && !PageSwapCache(head->wb_page))) { 79820633f04SWeston Andros Adamson set_page_private(head->wb_page, 0); 79920633f04SWeston Andros Adamson ClearPagePrivate(head->wb_page); 80020633f04SWeston Andros Adamson clear_bit(PG_MAPPED, &head->wb_flags); 80129418aa4SMel Gorman } 8024b9bb25bSTrond Myklebust spin_unlock(&mapping->private_lock); 80320633f04SWeston Andros Adamson } 80417089a29SWeston Andros Adamson 80533ea5aaaSZhangXiaoxu if (test_and_clear_bit(PG_INODE_REF, &req->wb_flags)) { 8061da177e4SLinus Torvalds nfs_release_request(req); 80733ea5aaaSZhangXiaoxu atomic_long_dec(&nfsi->nrequests); 80833ea5aaaSZhangXiaoxu } 8091da177e4SLinus Torvalds } 8101da177e4SLinus Torvalds 81161822ab5STrond Myklebust static void 8126d884e8fSFred nfs_mark_request_dirty(struct nfs_page *req) 81361822ab5STrond Myklebust { 81467911c8fSAnna Schumaker if (req->wb_page) 81561822ab5STrond Myklebust __set_page_dirty_nobuffers(req->wb_page); 81661822ab5STrond Myklebust } 81761822ab5STrond Myklebust 8183a3908c8STrond Myklebust /* 8193a3908c8STrond Myklebust * nfs_page_search_commits_for_head_request_locked 8203a3908c8STrond Myklebust * 8213a3908c8STrond Myklebust * Search through commit lists on @inode for the head request for @page. 8223a3908c8STrond Myklebust * Must be called while holding the inode (which is cinfo) lock. 8233a3908c8STrond Myklebust * 8243a3908c8STrond Myklebust * Returns the head request if found, or NULL if not found. 8253a3908c8STrond Myklebust */ 8263a3908c8STrond Myklebust static struct nfs_page * 8273a3908c8STrond Myklebust nfs_page_search_commits_for_head_request_locked(struct nfs_inode *nfsi, 8283a3908c8STrond Myklebust struct page *page) 8293a3908c8STrond Myklebust { 8303a3908c8STrond Myklebust struct nfs_page *freq, *t; 8313a3908c8STrond Myklebust struct nfs_commit_info cinfo; 8323a3908c8STrond Myklebust struct inode *inode = &nfsi->vfs_inode; 8333a3908c8STrond Myklebust 8343a3908c8STrond Myklebust nfs_init_cinfo_from_inode(&cinfo, inode); 8353a3908c8STrond Myklebust 8363a3908c8STrond Myklebust /* search through pnfs commit lists */ 8373a3908c8STrond Myklebust freq = pnfs_search_commit_reqs(inode, &cinfo, page); 8383a3908c8STrond Myklebust if (freq) 8393a3908c8STrond Myklebust return freq->wb_head; 8403a3908c8STrond Myklebust 8413a3908c8STrond Myklebust /* Linearly search the commit list for the correct request */ 8423a3908c8STrond Myklebust list_for_each_entry_safe(freq, t, &cinfo.mds->list, wb_list) { 8433a3908c8STrond Myklebust if (freq->wb_page == page) 8443a3908c8STrond Myklebust return freq->wb_head; 8453a3908c8STrond Myklebust } 8463a3908c8STrond Myklebust 8473a3908c8STrond Myklebust return NULL; 8483a3908c8STrond Myklebust } 8493a3908c8STrond Myklebust 8508dd37758STrond Myklebust /** 85186d80f97STrond Myklebust * nfs_request_add_commit_list_locked - add request to a commit list 85286d80f97STrond Myklebust * @req: pointer to a struct nfs_page 85386d80f97STrond Myklebust * @dst: commit list head 85486d80f97STrond Myklebust * @cinfo: holds list lock and accounting info 85586d80f97STrond Myklebust * 85686d80f97STrond Myklebust * This sets the PG_CLEAN bit, updates the cinfo count of 85786d80f97STrond Myklebust * number of outstanding requests requiring a commit as well as 85886d80f97STrond Myklebust * the MM page stats. 85986d80f97STrond Myklebust * 860e824f99aSTrond Myklebust * The caller must hold NFS_I(cinfo->inode)->commit_mutex, and the 861e824f99aSTrond Myklebust * nfs_page lock. 86286d80f97STrond Myklebust */ 86386d80f97STrond Myklebust void 86486d80f97STrond Myklebust nfs_request_add_commit_list_locked(struct nfs_page *req, struct list_head *dst, 86586d80f97STrond Myklebust struct nfs_commit_info *cinfo) 86686d80f97STrond Myklebust { 86786d80f97STrond Myklebust set_bit(PG_CLEAN, &req->wb_flags); 86886d80f97STrond Myklebust nfs_list_add_request(req, dst); 8695cb953d4STrond Myklebust atomic_long_inc(&cinfo->mds->ncommit); 87086d80f97STrond Myklebust } 87186d80f97STrond Myklebust EXPORT_SYMBOL_GPL(nfs_request_add_commit_list_locked); 87286d80f97STrond Myklebust 87386d80f97STrond Myklebust /** 8748dd37758STrond Myklebust * nfs_request_add_commit_list - add request to a commit list 8758dd37758STrond Myklebust * @req: pointer to a struct nfs_page 876ea2cf228SFred Isaman * @cinfo: holds list lock and accounting info 8778dd37758STrond Myklebust * 878ea2cf228SFred Isaman * This sets the PG_CLEAN bit, updates the cinfo count of 8798dd37758STrond Myklebust * number of outstanding requests requiring a commit as well as 8808dd37758STrond Myklebust * the MM page stats. 8818dd37758STrond Myklebust * 882ea2cf228SFred Isaman * The caller must _not_ hold the cinfo->lock, but must be 8838dd37758STrond Myklebust * holding the nfs_page lock. 8848dd37758STrond Myklebust */ 8858dd37758STrond Myklebust void 8866272dcc6SAnna Schumaker nfs_request_add_commit_list(struct nfs_page *req, struct nfs_commit_info *cinfo) 8878dd37758STrond Myklebust { 888e824f99aSTrond Myklebust mutex_lock(&NFS_I(cinfo->inode)->commit_mutex); 8896272dcc6SAnna Schumaker nfs_request_add_commit_list_locked(req, &cinfo->mds->list, cinfo); 890e824f99aSTrond Myklebust mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex); 89167911c8fSAnna Schumaker if (req->wb_page) 89286d80f97STrond Myklebust nfs_mark_page_unstable(req->wb_page, cinfo); 8938dd37758STrond Myklebust } 8948dd37758STrond Myklebust EXPORT_SYMBOL_GPL(nfs_request_add_commit_list); 8958dd37758STrond Myklebust 8968dd37758STrond Myklebust /** 8978dd37758STrond Myklebust * nfs_request_remove_commit_list - Remove request from a commit list 8988dd37758STrond Myklebust * @req: pointer to a nfs_page 899ea2cf228SFred Isaman * @cinfo: holds list lock and accounting info 9008dd37758STrond Myklebust * 901ea2cf228SFred Isaman * This clears the PG_CLEAN bit, and updates the cinfo's count of 9028dd37758STrond Myklebust * number of outstanding requests requiring a commit 9038dd37758STrond Myklebust * It does not update the MM page stats. 9048dd37758STrond Myklebust * 905ea2cf228SFred Isaman * The caller _must_ hold the cinfo->lock and the nfs_page lock. 9068dd37758STrond Myklebust */ 9078dd37758STrond Myklebust void 908ea2cf228SFred Isaman nfs_request_remove_commit_list(struct nfs_page *req, 909ea2cf228SFred Isaman struct nfs_commit_info *cinfo) 9108dd37758STrond Myklebust { 9118dd37758STrond Myklebust if (!test_and_clear_bit(PG_CLEAN, &(req)->wb_flags)) 9128dd37758STrond Myklebust return; 9138dd37758STrond Myklebust nfs_list_remove_request(req); 9145cb953d4STrond Myklebust atomic_long_dec(&cinfo->mds->ncommit); 9158dd37758STrond Myklebust } 9168dd37758STrond Myklebust EXPORT_SYMBOL_GPL(nfs_request_remove_commit_list); 9178dd37758STrond Myklebust 918ea2cf228SFred Isaman static void nfs_init_cinfo_from_inode(struct nfs_commit_info *cinfo, 919ea2cf228SFred Isaman struct inode *inode) 920ea2cf228SFred Isaman { 921fe238e60SDave Wysochanski cinfo->inode = inode; 922ea2cf228SFred Isaman cinfo->mds = &NFS_I(inode)->commit_info; 923ea2cf228SFred Isaman cinfo->ds = pnfs_get_ds_info(inode); 924b359f9d0SFred Isaman cinfo->dreq = NULL; 925f453a54aSFred Isaman cinfo->completion_ops = &nfs_commit_completion_ops; 926ea2cf228SFred Isaman } 927ea2cf228SFred Isaman 928ea2cf228SFred Isaman void nfs_init_cinfo(struct nfs_commit_info *cinfo, 929ea2cf228SFred Isaman struct inode *inode, 930ea2cf228SFred Isaman struct nfs_direct_req *dreq) 931ea2cf228SFred Isaman { 9321763da12SFred Isaman if (dreq) 9331763da12SFred Isaman nfs_init_cinfo_from_dreq(cinfo, dreq); 9341763da12SFred Isaman else 935ea2cf228SFred Isaman nfs_init_cinfo_from_inode(cinfo, inode); 936ea2cf228SFred Isaman } 937ea2cf228SFred Isaman EXPORT_SYMBOL_GPL(nfs_init_cinfo); 9388dd37758STrond Myklebust 9391da177e4SLinus Torvalds /* 9401da177e4SLinus Torvalds * Add a request to the inode's commit list. 9411da177e4SLinus Torvalds */ 9421763da12SFred Isaman void 943ea2cf228SFred Isaman nfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg, 944b57ff130SWeston Andros Adamson struct nfs_commit_info *cinfo, u32 ds_commit_idx) 9451da177e4SLinus Torvalds { 946b57ff130SWeston Andros Adamson if (pnfs_mark_request_commit(req, lseg, cinfo, ds_commit_idx)) 9478dd37758STrond Myklebust return; 9486272dcc6SAnna Schumaker nfs_request_add_commit_list(req, cinfo); 9491da177e4SLinus Torvalds } 9508e821cadSTrond Myklebust 951d6d6dc7cSFred Isaman static void 952d6d6dc7cSFred Isaman nfs_clear_page_commit(struct page *page) 953e468bae9STrond Myklebust { 9548d92890bSNeilBrown dec_node_page_state(page, NR_WRITEBACK); 95593f78d88STejun Heo dec_wb_stat(&inode_to_bdi(page_file_mapping(page)->host)->wb, 9568d92890bSNeilBrown WB_WRITEBACK); 957e468bae9STrond Myklebust } 958d6d6dc7cSFred Isaman 959b5bab9bfSTrond Myklebust /* Called holding the request lock on @req */ 9608dd37758STrond Myklebust static void 961d6d6dc7cSFred Isaman nfs_clear_request_commit(struct nfs_page *req) 962d6d6dc7cSFred Isaman { 9638dd37758STrond Myklebust if (test_bit(PG_CLEAN, &req->wb_flags)) { 9649fcd5960STrond Myklebust struct nfs_open_context *ctx = nfs_req_openctx(req); 9659fcd5960STrond Myklebust struct inode *inode = d_inode(ctx->dentry); 966ea2cf228SFred Isaman struct nfs_commit_info cinfo; 967d6d6dc7cSFred Isaman 968ea2cf228SFred Isaman nfs_init_cinfo_from_inode(&cinfo, inode); 969e824f99aSTrond Myklebust mutex_lock(&NFS_I(inode)->commit_mutex); 970ea2cf228SFred Isaman if (!pnfs_clear_request_commit(req, &cinfo)) { 971ea2cf228SFred Isaman nfs_request_remove_commit_list(req, &cinfo); 972d6d6dc7cSFred Isaman } 973e824f99aSTrond Myklebust mutex_unlock(&NFS_I(inode)->commit_mutex); 9748dd37758STrond Myklebust nfs_clear_page_commit(req->wb_page); 9758dd37758STrond Myklebust } 976e468bae9STrond Myklebust } 977e468bae9STrond Myklebust 978d45f60c6SWeston Andros Adamson int nfs_write_need_commit(struct nfs_pgio_header *hdr) 9798e821cadSTrond Myklebust { 980c65e6254SWeston Andros Adamson if (hdr->verf.committed == NFS_DATA_SYNC) 981d45f60c6SWeston Andros Adamson return hdr->lseg == NULL; 982c65e6254SWeston Andros Adamson return hdr->verf.committed != NFS_FILE_SYNC; 9838e821cadSTrond Myklebust } 9848e821cadSTrond Myklebust 985919e3bd9STrond Myklebust static void nfs_async_write_init(struct nfs_pgio_header *hdr) 986919e3bd9STrond Myklebust { 987919e3bd9STrond Myklebust nfs_io_completion_get(hdr->io_completion); 988919e3bd9STrond Myklebust } 989919e3bd9STrond Myklebust 990061ae2edSFred Isaman static void nfs_write_completion(struct nfs_pgio_header *hdr) 9916c75dc0dSFred Isaman { 992ea2cf228SFred Isaman struct nfs_commit_info cinfo; 9936c75dc0dSFred Isaman unsigned long bytes = 0; 9946c75dc0dSFred Isaman 9956c75dc0dSFred Isaman if (test_bit(NFS_IOHDR_REDO, &hdr->flags)) 9966c75dc0dSFred Isaman goto out; 997ea2cf228SFred Isaman nfs_init_cinfo_from_inode(&cinfo, hdr->inode); 9986c75dc0dSFred Isaman while (!list_empty(&hdr->pages)) { 9996c75dc0dSFred Isaman struct nfs_page *req = nfs_list_entry(hdr->pages.next); 10006c75dc0dSFred Isaman 10016c75dc0dSFred Isaman bytes += req->wb_bytes; 10026c75dc0dSFred Isaman nfs_list_remove_request(req); 10036c75dc0dSFred Isaman if (test_bit(NFS_IOHDR_ERROR, &hdr->flags) && 10046c75dc0dSFred Isaman (hdr->good_bytes < bytes)) { 1005861e1671SChuck Lever trace_nfs_comp_error(req, hdr->error); 10066fbda89bSTrond Myklebust nfs_mapping_set_error(req->wb_page, hdr->error); 10076c75dc0dSFred Isaman goto remove_req; 10086c75dc0dSFred Isaman } 1009c65e6254SWeston Andros Adamson if (nfs_write_need_commit(hdr)) { 101033344e0fSTrond Myklebust /* Reset wb_nio, since the write was successful. */ 101133344e0fSTrond Myklebust req->wb_nio = 0; 1012f79d06f5SAnna Schumaker memcpy(&req->wb_verf, &hdr->verf.verifier, sizeof(req->wb_verf)); 1013b57ff130SWeston Andros Adamson nfs_mark_request_commit(req, hdr->lseg, &cinfo, 1014a7d42ddbSWeston Andros Adamson hdr->pgio_mirror_idx); 10156c75dc0dSFred Isaman goto next; 10166c75dc0dSFred Isaman } 10176c75dc0dSFred Isaman remove_req: 10186c75dc0dSFred Isaman nfs_inode_remove_request(req); 10196c75dc0dSFred Isaman next: 102020633f04SWeston Andros Adamson nfs_end_page_writeback(req); 10213aff4ebbSTrond Myklebust nfs_release_request(req); 10226c75dc0dSFred Isaman } 10236c75dc0dSFred Isaman out: 1024919e3bd9STrond Myklebust nfs_io_completion_put(hdr->io_completion); 10256c75dc0dSFred Isaman hdr->release(hdr); 10266c75dc0dSFred Isaman } 10276c75dc0dSFred Isaman 1028ce59515cSAnna Schumaker unsigned long 1029ea2cf228SFred Isaman nfs_reqs_to_commit(struct nfs_commit_info *cinfo) 1030fb8a1f11STrond Myklebust { 10315cb953d4STrond Myklebust return atomic_long_read(&cinfo->mds->ncommit); 1032fb8a1f11STrond Myklebust } 1033fb8a1f11STrond Myklebust 1034e824f99aSTrond Myklebust /* NFS_I(cinfo->inode)->commit_mutex held by caller */ 10351763da12SFred Isaman int 1036ea2cf228SFred Isaman nfs_scan_commit_list(struct list_head *src, struct list_head *dst, 1037ea2cf228SFred Isaman struct nfs_commit_info *cinfo, int max) 1038d6d6dc7cSFred Isaman { 1039137da553STrond Myklebust struct nfs_page *req, *tmp; 1040d6d6dc7cSFred Isaman int ret = 0; 1041d6d6dc7cSFred Isaman 1042137da553STrond Myklebust restart: 1043137da553STrond Myklebust list_for_each_entry_safe(req, tmp, src, wb_list) { 10447ad84aa9STrond Myklebust kref_get(&req->wb_kref); 10452ce209c4STrond Myklebust if (!nfs_lock_request(req)) { 10462ce209c4STrond Myklebust int status; 1047137da553STrond Myklebust 1048137da553STrond Myklebust /* Prevent deadlock with nfs_lock_and_join_requests */ 1049137da553STrond Myklebust if (!list_empty(dst)) { 1050137da553STrond Myklebust nfs_release_request(req); 1051137da553STrond Myklebust continue; 1052137da553STrond Myklebust } 1053137da553STrond Myklebust /* Ensure we make progress to prevent livelock */ 10542ce209c4STrond Myklebust mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex); 10552ce209c4STrond Myklebust status = nfs_wait_on_request(req); 10562ce209c4STrond Myklebust nfs_release_request(req); 10572ce209c4STrond Myklebust mutex_lock(&NFS_I(cinfo->inode)->commit_mutex); 10582ce209c4STrond Myklebust if (status < 0) 10592ce209c4STrond Myklebust break; 1060137da553STrond Myklebust goto restart; 10612ce209c4STrond Myklebust } 1062ea2cf228SFred Isaman nfs_request_remove_commit_list(req, cinfo); 10635d2a9d9dSTrond Myklebust clear_bit(PG_COMMIT_TO_DS, &req->wb_flags); 10648dd37758STrond Myklebust nfs_list_add_request(req, dst); 1065d6d6dc7cSFred Isaman ret++; 10661763da12SFred Isaman if ((ret == max) && !cinfo->dreq) 1067d6d6dc7cSFred Isaman break; 1068e824f99aSTrond Myklebust cond_resched(); 1069d6d6dc7cSFred Isaman } 1070d6d6dc7cSFred Isaman return ret; 1071d6d6dc7cSFred Isaman } 10725d2a9d9dSTrond Myklebust EXPORT_SYMBOL_GPL(nfs_scan_commit_list); 1073d6d6dc7cSFred Isaman 10741da177e4SLinus Torvalds /* 10751da177e4SLinus Torvalds * nfs_scan_commit - Scan an inode for commit requests 10761da177e4SLinus Torvalds * @inode: NFS inode to scan 1077ea2cf228SFred Isaman * @dst: mds destination list 1078ea2cf228SFred Isaman * @cinfo: mds and ds lists of reqs ready to commit 10791da177e4SLinus Torvalds * 10801da177e4SLinus Torvalds * Moves requests from the inode's 'commit' request list. 10811da177e4SLinus Torvalds * The requests are *not* checked to ensure that they form a contiguous set. 10821da177e4SLinus Torvalds */ 10831763da12SFred Isaman int 1084ea2cf228SFred Isaman nfs_scan_commit(struct inode *inode, struct list_head *dst, 1085ea2cf228SFred Isaman struct nfs_commit_info *cinfo) 10861da177e4SLinus Torvalds { 1087d6d6dc7cSFred Isaman int ret = 0; 1088fb8a1f11STrond Myklebust 10895cb953d4STrond Myklebust if (!atomic_long_read(&cinfo->mds->ncommit)) 10905cb953d4STrond Myklebust return 0; 1091e824f99aSTrond Myklebust mutex_lock(&NFS_I(cinfo->inode)->commit_mutex); 10925cb953d4STrond Myklebust if (atomic_long_read(&cinfo->mds->ncommit) > 0) { 10938dd37758STrond Myklebust const int max = INT_MAX; 1094d6d6dc7cSFred Isaman 1095ea2cf228SFred Isaman ret = nfs_scan_commit_list(&cinfo->mds->list, dst, 1096ea2cf228SFred Isaman cinfo, max); 1097ea2cf228SFred Isaman ret += pnfs_scan_commit_lists(inode, cinfo, max - ret); 1098d6d6dc7cSFred Isaman } 1099e824f99aSTrond Myklebust mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex); 1100ff778d02STrond Myklebust return ret; 11011da177e4SLinus Torvalds } 1102d6d6dc7cSFred Isaman 11031da177e4SLinus Torvalds /* 1104e7d39069STrond Myklebust * Search for an existing write request, and attempt to update 1105e7d39069STrond Myklebust * it to reflect a new dirty region on a given page. 11061da177e4SLinus Torvalds * 1107e7d39069STrond Myklebust * If the attempt fails, then the existing request is flushed out 1108e7d39069STrond Myklebust * to disk. 11091da177e4SLinus Torvalds */ 1110e7d39069STrond Myklebust static struct nfs_page *nfs_try_to_update_request(struct inode *inode, 1111e7d39069STrond Myklebust struct page *page, 1112e7d39069STrond Myklebust unsigned int offset, 1113e7d39069STrond Myklebust unsigned int bytes) 11141da177e4SLinus Torvalds { 1115e7d39069STrond Myklebust struct nfs_page *req; 1116e7d39069STrond Myklebust unsigned int rqend; 1117e7d39069STrond Myklebust unsigned int end; 11181da177e4SLinus Torvalds int error; 1119277459d2STrond Myklebust 1120e7d39069STrond Myklebust end = offset + bytes; 1121e7d39069STrond Myklebust 1122f6032f21STrond Myklebust req = nfs_lock_and_join_requests(page); 1123f6032f21STrond Myklebust if (IS_ERR_OR_NULL(req)) 1124f6032f21STrond Myklebust return req; 11252bfc6e56SWeston Andros Adamson 1126e7d39069STrond Myklebust rqend = req->wb_offset + req->wb_bytes; 1127e7d39069STrond Myklebust /* 1128e7d39069STrond Myklebust * Tell the caller to flush out the request if 1129e7d39069STrond Myklebust * the offsets are non-contiguous. 1130e7d39069STrond Myklebust * Note: nfs_flush_incompatible() will already 1131e7d39069STrond Myklebust * have flushed out requests having wrong owners. 1132e7d39069STrond Myklebust */ 1133f6032f21STrond Myklebust if (offset > rqend || end < req->wb_offset) 1134e7d39069STrond Myklebust goto out_flushme; 1135e7d39069STrond Myklebust 11361da177e4SLinus Torvalds /* Okay, the request matches. Update the region */ 11371da177e4SLinus Torvalds if (offset < req->wb_offset) { 11381da177e4SLinus Torvalds req->wb_offset = offset; 11391da177e4SLinus Torvalds req->wb_pgbase = offset; 11401da177e4SLinus Torvalds } 11411da177e4SLinus Torvalds if (end > rqend) 11421da177e4SLinus Torvalds req->wb_bytes = end - req->wb_offset; 1143e7d39069STrond Myklebust else 1144e7d39069STrond Myklebust req->wb_bytes = rqend - req->wb_offset; 114533344e0fSTrond Myklebust req->wb_nio = 0; 1146e7d39069STrond Myklebust return req; 1147e7d39069STrond Myklebust out_flushme: 1148f6032f21STrond Myklebust /* 1149f6032f21STrond Myklebust * Note: we mark the request dirty here because 1150f6032f21STrond Myklebust * nfs_lock_and_join_requests() cannot preserve 1151f6032f21STrond Myklebust * commit flags, so we have to replay the write. 1152f6032f21STrond Myklebust */ 1153f6032f21STrond Myklebust nfs_mark_request_dirty(req); 1154f6032f21STrond Myklebust nfs_unlock_and_release_request(req); 1155e7d39069STrond Myklebust error = nfs_wb_page(inode, page); 1156f6032f21STrond Myklebust return (error < 0) ? ERR_PTR(error) : NULL; 1157e7d39069STrond Myklebust } 11581da177e4SLinus Torvalds 1159e7d39069STrond Myklebust /* 1160e7d39069STrond Myklebust * Try to update an existing write request, or create one if there is none. 1161e7d39069STrond Myklebust * 1162e7d39069STrond Myklebust * Note: Should always be called with the Page Lock held to prevent races 1163e7d39069STrond Myklebust * if we have to add a new request. Also assumes that the caller has 1164e7d39069STrond Myklebust * already called nfs_flush_incompatible() if necessary. 1165e7d39069STrond Myklebust */ 1166e7d39069STrond Myklebust static struct nfs_page * nfs_setup_write_request(struct nfs_open_context* ctx, 1167e7d39069STrond Myklebust struct page *page, unsigned int offset, unsigned int bytes) 1168e7d39069STrond Myklebust { 1169d56b4ddfSMel Gorman struct inode *inode = page_file_mapping(page)->host; 1170e7d39069STrond Myklebust struct nfs_page *req; 1171e7d39069STrond Myklebust 1172e7d39069STrond Myklebust req = nfs_try_to_update_request(inode, page, offset, bytes); 1173e7d39069STrond Myklebust if (req != NULL) 1174e7d39069STrond Myklebust goto out; 117528b1d3f5STrond Myklebust req = nfs_create_request(ctx, page, offset, bytes); 1176e7d39069STrond Myklebust if (IS_ERR(req)) 1177e7d39069STrond Myklebust goto out; 1178d6d6dc7cSFred Isaman nfs_inode_add_request(inode, req); 1179efc91ed0STrond Myklebust out: 118061e930a9STrond Myklebust return req; 11811da177e4SLinus Torvalds } 11821da177e4SLinus Torvalds 1183e7d39069STrond Myklebust static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page, 1184e7d39069STrond Myklebust unsigned int offset, unsigned int count) 1185e7d39069STrond Myklebust { 1186e7d39069STrond Myklebust struct nfs_page *req; 1187e7d39069STrond Myklebust 1188e7d39069STrond Myklebust req = nfs_setup_write_request(ctx, page, offset, count); 1189e7d39069STrond Myklebust if (IS_ERR(req)) 1190e7d39069STrond Myklebust return PTR_ERR(req); 1191e7d39069STrond Myklebust /* Update file length */ 1192e7d39069STrond Myklebust nfs_grow_file(page, offset, count); 1193d72ddcbaSWeston Andros Adamson nfs_mark_uptodate(req); 1194a6305ddbSTrond Myklebust nfs_mark_request_dirty(req); 11951d1afcbcSTrond Myklebust nfs_unlock_and_release_request(req); 1196e7d39069STrond Myklebust return 0; 1197e7d39069STrond Myklebust } 1198e7d39069STrond Myklebust 11991da177e4SLinus Torvalds int nfs_flush_incompatible(struct file *file, struct page *page) 12001da177e4SLinus Torvalds { 1201cd3758e3STrond Myklebust struct nfs_open_context *ctx = nfs_file_open_context(file); 12022a369153STrond Myklebust struct nfs_lock_context *l_ctx; 1203bd61e0a9SJeff Layton struct file_lock_context *flctx = file_inode(file)->i_flctx; 12041da177e4SLinus Torvalds struct nfs_page *req; 12051a54533eSTrond Myklebust int do_flush, status; 12061da177e4SLinus Torvalds /* 12071da177e4SLinus Torvalds * Look for a request corresponding to this page. If there 12081da177e4SLinus Torvalds * is one, and it belongs to another file, we flush it out 12091da177e4SLinus Torvalds * before we try to copy anything into the page. Do this 12101da177e4SLinus Torvalds * due to the lack of an ACCESS-type call in NFSv2. 12111da177e4SLinus Torvalds * Also do the same if we find a request from an existing 12121da177e4SLinus Torvalds * dropped page. 12131da177e4SLinus Torvalds */ 12141a54533eSTrond Myklebust do { 121584d3a9a9SWeston Andros Adamson req = nfs_page_find_head_request(page); 12161a54533eSTrond Myklebust if (req == NULL) 12171a54533eSTrond Myklebust return 0; 12182a369153STrond Myklebust l_ctx = req->wb_lock_context; 1219138a2935STrond Myklebust do_flush = req->wb_page != page || 12209fcd5960STrond Myklebust !nfs_match_open_context(nfs_req_openctx(req), ctx); 1221bd61e0a9SJeff Layton if (l_ctx && flctx && 1222bd61e0a9SJeff Layton !(list_empty_careful(&flctx->flc_posix) && 1223bd61e0a9SJeff Layton list_empty_careful(&flctx->flc_flock))) { 1224d51fdb87SNeilBrown do_flush |= l_ctx->lockowner != current->files; 12255263e31eSJeff Layton } 12261da177e4SLinus Torvalds nfs_release_request(req); 12271a54533eSTrond Myklebust if (!do_flush) 12281a54533eSTrond Myklebust return 0; 1229d56b4ddfSMel Gorman status = nfs_wb_page(page_file_mapping(page)->host, page); 12301a54533eSTrond Myklebust } while (status == 0); 12311a54533eSTrond Myklebust return status; 12321da177e4SLinus Torvalds } 12331da177e4SLinus Torvalds 12341da177e4SLinus Torvalds /* 1235dc24826bSAndy Adamson * Avoid buffered writes when a open context credential's key would 1236dc24826bSAndy Adamson * expire soon. 1237dc24826bSAndy Adamson * 1238dc24826bSAndy Adamson * Returns -EACCES if the key will expire within RPC_KEY_EXPIRE_FAIL. 1239dc24826bSAndy Adamson * 1240dc24826bSAndy Adamson * Return 0 and set a credential flag which triggers the inode to flush 1241dc24826bSAndy Adamson * and performs NFS_FILE_SYNC writes if the key will expired within 1242dc24826bSAndy Adamson * RPC_KEY_EXPIRE_TIMEO. 1243dc24826bSAndy Adamson */ 1244dc24826bSAndy Adamson int 1245dc24826bSAndy Adamson nfs_key_timeout_notify(struct file *filp, struct inode *inode) 1246dc24826bSAndy Adamson { 1247dc24826bSAndy Adamson struct nfs_open_context *ctx = nfs_file_open_context(filp); 1248dc24826bSAndy Adamson 1249ddf529eeSNeilBrown if (nfs_ctx_key_to_expire(ctx, inode) && 1250ca05cbaeSTrond Myklebust !rcu_access_pointer(ctx->ll_cred)) 1251ddf529eeSNeilBrown /* Already expired! */ 1252ddf529eeSNeilBrown return -EACCES; 1253ddf529eeSNeilBrown return 0; 1254dc24826bSAndy Adamson } 1255dc24826bSAndy Adamson 1256dc24826bSAndy Adamson /* 1257dc24826bSAndy Adamson * Test if the open context credential key is marked to expire soon. 1258dc24826bSAndy Adamson */ 1259ce52914eSScott Mayhew bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx, struct inode *inode) 1260dc24826bSAndy Adamson { 1261ce52914eSScott Mayhew struct rpc_auth *auth = NFS_SERVER(inode)->client->cl_auth; 1262ca05cbaeSTrond Myklebust struct rpc_cred *cred, *new, *old = NULL; 1263ddf529eeSNeilBrown struct auth_cred acred = { 1264a52458b4SNeilBrown .cred = ctx->cred, 1265ddf529eeSNeilBrown }; 1266ca05cbaeSTrond Myklebust bool ret = false; 1267ce52914eSScott Mayhew 1268ca05cbaeSTrond Myklebust rcu_read_lock(); 1269ca05cbaeSTrond Myklebust cred = rcu_dereference(ctx->ll_cred); 1270ca05cbaeSTrond Myklebust if (cred && !(cred->cr_ops->crkey_timeout && 1271ca05cbaeSTrond Myklebust cred->cr_ops->crkey_timeout(cred))) 1272ca05cbaeSTrond Myklebust goto out; 1273ca05cbaeSTrond Myklebust rcu_read_unlock(); 1274ca05cbaeSTrond Myklebust 1275ca05cbaeSTrond Myklebust new = auth->au_ops->lookup_cred(auth, &acred, 0); 1276ca05cbaeSTrond Myklebust if (new == cred) { 1277ca05cbaeSTrond Myklebust put_rpccred(new); 1278ddf529eeSNeilBrown return true; 1279ca05cbaeSTrond Myklebust } 1280ca05cbaeSTrond Myklebust if (IS_ERR_OR_NULL(new)) { 1281ca05cbaeSTrond Myklebust new = NULL; 1282ca05cbaeSTrond Myklebust ret = true; 1283ca05cbaeSTrond Myklebust } else if (new->cr_ops->crkey_timeout && 1284ca05cbaeSTrond Myklebust new->cr_ops->crkey_timeout(new)) 1285ca05cbaeSTrond Myklebust ret = true; 1286ca05cbaeSTrond Myklebust 1287ca05cbaeSTrond Myklebust rcu_read_lock(); 1288ca05cbaeSTrond Myklebust old = rcu_dereference_protected(xchg(&ctx->ll_cred, 1289ca05cbaeSTrond Myklebust RCU_INITIALIZER(new)), 1); 1290ca05cbaeSTrond Myklebust out: 1291ca05cbaeSTrond Myklebust rcu_read_unlock(); 1292ca05cbaeSTrond Myklebust put_rpccred(old); 1293ca05cbaeSTrond Myklebust return ret; 1294dc24826bSAndy Adamson } 1295dc24826bSAndy Adamson 1296dc24826bSAndy Adamson /* 12975d47a356STrond Myklebust * If the page cache is marked as unsafe or invalid, then we can't rely on 12985d47a356STrond Myklebust * the PageUptodate() flag. In this case, we will need to turn off 12995d47a356STrond Myklebust * write optimisations that depend on the page contents being correct. 13005d47a356STrond Myklebust */ 1301fc9dc401STrond Myklebust static bool nfs_write_pageuptodate(struct page *page, struct inode *inode, 1302fc9dc401STrond Myklebust unsigned int pagelen) 13035d47a356STrond Myklebust { 1304d529ef83SJeff Layton struct nfs_inode *nfsi = NFS_I(inode); 1305d529ef83SJeff Layton 13068d197a56STrond Myklebust if (nfs_have_delegated_attributes(inode)) 13078d197a56STrond Myklebust goto out; 1308fc9dc401STrond Myklebust if (nfsi->cache_validity & 130913c0b082STrond Myklebust (NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_SIZE)) 1310d529ef83SJeff Layton return false; 13114db72b40SJeff Layton smp_rmb(); 1312fc9dc401STrond Myklebust if (test_bit(NFS_INO_INVALIDATING, &nfsi->flags) && pagelen != 0) 13138d197a56STrond Myklebust return false; 13148d197a56STrond Myklebust out: 1315fc9dc401STrond Myklebust if (nfsi->cache_validity & NFS_INO_INVALID_DATA && pagelen != 0) 131618dd78c4SScott Mayhew return false; 13178d197a56STrond Myklebust return PageUptodate(page) != 0; 13185d47a356STrond Myklebust } 13195d47a356STrond Myklebust 13205263e31eSJeff Layton static bool 13215263e31eSJeff Layton is_whole_file_wrlock(struct file_lock *fl) 13225263e31eSJeff Layton { 13235263e31eSJeff Layton return fl->fl_start == 0 && fl->fl_end == OFFSET_MAX && 13245263e31eSJeff Layton fl->fl_type == F_WRLCK; 13255263e31eSJeff Layton } 13265263e31eSJeff Layton 1327c7559663SScott Mayhew /* If we know the page is up to date, and we're not using byte range locks (or 1328c7559663SScott Mayhew * if we have the whole file locked for writing), it may be more efficient to 1329c7559663SScott Mayhew * extend the write to cover the entire page in order to avoid fragmentation 1330c7559663SScott Mayhew * inefficiencies. 1331c7559663SScott Mayhew * 1332263b4509SScott Mayhew * If the file is opened for synchronous writes then we can just skip the rest 1333263b4509SScott Mayhew * of the checks. 1334c7559663SScott Mayhew */ 1335fc9dc401STrond Myklebust static int nfs_can_extend_write(struct file *file, struct page *page, 1336fc9dc401STrond Myklebust struct inode *inode, unsigned int pagelen) 1337c7559663SScott Mayhew { 13385263e31eSJeff Layton int ret; 13395263e31eSJeff Layton struct file_lock_context *flctx = inode->i_flctx; 13405263e31eSJeff Layton struct file_lock *fl; 13415263e31eSJeff Layton 1342c7559663SScott Mayhew if (file->f_flags & O_DSYNC) 1343c7559663SScott Mayhew return 0; 1344fc9dc401STrond Myklebust if (!nfs_write_pageuptodate(page, inode, pagelen)) 1345263b4509SScott Mayhew return 0; 1346c7559663SScott Mayhew if (NFS_PROTO(inode)->have_delegation(inode, FMODE_WRITE)) 1347c7559663SScott Mayhew return 1; 1348bd61e0a9SJeff Layton if (!flctx || (list_empty_careful(&flctx->flc_flock) && 1349bd61e0a9SJeff Layton list_empty_careful(&flctx->flc_posix))) 13508fa4592aSTrond Myklebust return 1; 13515263e31eSJeff Layton 13525263e31eSJeff Layton /* Check to see if there are whole file write locks */ 13535263e31eSJeff Layton ret = 0; 13546109c850SJeff Layton spin_lock(&flctx->flc_lock); 1355bd61e0a9SJeff Layton if (!list_empty(&flctx->flc_posix)) { 1356bd61e0a9SJeff Layton fl = list_first_entry(&flctx->flc_posix, struct file_lock, 1357bd61e0a9SJeff Layton fl_list); 1358bd61e0a9SJeff Layton if (is_whole_file_wrlock(fl)) 13595263e31eSJeff Layton ret = 1; 1360bd61e0a9SJeff Layton } else if (!list_empty(&flctx->flc_flock)) { 13615263e31eSJeff Layton fl = list_first_entry(&flctx->flc_flock, struct file_lock, 13625263e31eSJeff Layton fl_list); 13635263e31eSJeff Layton if (fl->fl_type == F_WRLCK) 13645263e31eSJeff Layton ret = 1; 13655263e31eSJeff Layton } 13666109c850SJeff Layton spin_unlock(&flctx->flc_lock); 13675263e31eSJeff Layton return ret; 1368c7559663SScott Mayhew } 1369c7559663SScott Mayhew 13705d47a356STrond Myklebust /* 13711da177e4SLinus Torvalds * Update and possibly write a cached page of an NFS file. 13721da177e4SLinus Torvalds * 13731da177e4SLinus Torvalds * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad 13741da177e4SLinus Torvalds * things with a page scheduled for an RPC call (e.g. invalidate it). 13751da177e4SLinus Torvalds */ 13761da177e4SLinus Torvalds int nfs_updatepage(struct file *file, struct page *page, 13771da177e4SLinus Torvalds unsigned int offset, unsigned int count) 13781da177e4SLinus Torvalds { 1379cd3758e3STrond Myklebust struct nfs_open_context *ctx = nfs_file_open_context(file); 1380d2ceb7e5SBenjamin Coddington struct address_space *mapping = page_file_mapping(page); 1381d2ceb7e5SBenjamin Coddington struct inode *inode = mapping->host; 1382fc9dc401STrond Myklebust unsigned int pagelen = nfs_page_length(page); 13831da177e4SLinus Torvalds int status = 0; 13841da177e4SLinus Torvalds 138591d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE); 138691d5b470SChuck Lever 13876de1472fSAl Viro dprintk("NFS: nfs_updatepage(%pD2 %d@%lld)\n", 13886de1472fSAl Viro file, count, (long long)(page_file_offset(page) + offset)); 13891da177e4SLinus Torvalds 1390149a4fddSBenjamin Coddington if (!count) 1391149a4fddSBenjamin Coddington goto out; 1392149a4fddSBenjamin Coddington 1393fc9dc401STrond Myklebust if (nfs_can_extend_write(file, page, inode, pagelen)) { 1394fc9dc401STrond Myklebust count = max(count + offset, pagelen); 13951da177e4SLinus Torvalds offset = 0; 13961da177e4SLinus Torvalds } 13971da177e4SLinus Torvalds 1398e21195a7STrond Myklebust status = nfs_writepage_setup(ctx, page, offset, count); 139903fa9e84STrond Myklebust if (status < 0) 1400d2ceb7e5SBenjamin Coddington nfs_set_pageerror(mapping); 140159b7c05fSTrond Myklebust else 140259b7c05fSTrond Myklebust __set_page_dirty_nobuffers(page); 1403149a4fddSBenjamin Coddington out: 140448186c7dSChuck Lever dprintk("NFS: nfs_updatepage returns %d (isize %lld)\n", 14051da177e4SLinus Torvalds status, (long long)i_size_read(inode)); 14061da177e4SLinus Torvalds return status; 14071da177e4SLinus Torvalds } 14081da177e4SLinus Torvalds 14093ff7576dSTrond Myklebust static int flush_task_priority(int how) 14101da177e4SLinus Torvalds { 14111da177e4SLinus Torvalds switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) { 14121da177e4SLinus Torvalds case FLUSH_HIGHPRI: 14131da177e4SLinus Torvalds return RPC_PRIORITY_HIGH; 14141da177e4SLinus Torvalds case FLUSH_LOWPRI: 14151da177e4SLinus Torvalds return RPC_PRIORITY_LOW; 14161da177e4SLinus Torvalds } 14171da177e4SLinus Torvalds return RPC_PRIORITY_NORMAL; 14181da177e4SLinus Torvalds } 14191da177e4SLinus Torvalds 1420d45f60c6SWeston Andros Adamson static void nfs_initiate_write(struct nfs_pgio_header *hdr, 1421d45f60c6SWeston Andros Adamson struct rpc_message *msg, 1422abde71f4STom Haynes const struct nfs_rpc_ops *rpc_ops, 14231ed26f33SAnna Schumaker struct rpc_task_setup *task_setup_data, int how) 14241da177e4SLinus Torvalds { 14253ff7576dSTrond Myklebust int priority = flush_task_priority(how); 14261da177e4SLinus Torvalds 14271ed26f33SAnna Schumaker task_setup_data->priority = priority; 1428fb91fb0eSAnna Schumaker rpc_ops->write_setup(hdr, msg, &task_setup_data->rpc_client); 14295bb2a7cbSTrond Myklebust trace_nfs_initiate_write(hdr); 1430275acaafSTrond Myklebust } 1431275acaafSTrond Myklebust 14326d884e8fSFred /* If a nfs_flush_* function fails, it should remove reqs from @head and 14336d884e8fSFred * call this on each, which will prepare them to be retried on next 14346d884e8fSFred * writeback using standard nfs. 14356d884e8fSFred */ 14366d884e8fSFred static void nfs_redirty_request(struct nfs_page *req) 14376d884e8fSFred { 143833344e0fSTrond Myklebust /* Bump the transmission count */ 143933344e0fSTrond Myklebust req->wb_nio++; 14406d884e8fSFred nfs_mark_request_dirty(req); 14419fcd5960STrond Myklebust set_bit(NFS_CONTEXT_RESEND_WRITES, &nfs_req_openctx(req)->flags); 144220633f04SWeston Andros Adamson nfs_end_page_writeback(req); 14433aff4ebbSTrond Myklebust nfs_release_request(req); 14446d884e8fSFred } 14456d884e8fSFred 1446df3accb8STrond Myklebust static void nfs_async_write_error(struct list_head *head, int error) 14476c75dc0dSFred Isaman { 14486c75dc0dSFred Isaman struct nfs_page *req; 14496c75dc0dSFred Isaman 14506c75dc0dSFred Isaman while (!list_empty(head)) { 14516c75dc0dSFred Isaman req = nfs_list_entry(head->next); 14526c75dc0dSFred Isaman nfs_list_remove_request(req); 14536fbda89bSTrond Myklebust if (nfs_error_is_fatal(error)) 14546fbda89bSTrond Myklebust nfs_write_error(req, error); 14556fbda89bSTrond Myklebust else 14566c75dc0dSFred Isaman nfs_redirty_request(req); 14576c75dc0dSFred Isaman } 14586c75dc0dSFred Isaman } 14596c75dc0dSFred Isaman 1460dc602dd7STrond Myklebust static void nfs_async_write_reschedule_io(struct nfs_pgio_header *hdr) 1461dc602dd7STrond Myklebust { 1462df3accb8STrond Myklebust nfs_async_write_error(&hdr->pages, 0); 14637be7b3caSTrond Myklebust filemap_fdatawrite_range(hdr->inode->i_mapping, hdr->args.offset, 14647be7b3caSTrond Myklebust hdr->args.offset + hdr->args.count - 1); 1465dc602dd7STrond Myklebust } 1466dc602dd7STrond Myklebust 1467061ae2edSFred Isaman static const struct nfs_pgio_completion_ops nfs_async_write_completion_ops = { 1468919e3bd9STrond Myklebust .init_hdr = nfs_async_write_init, 1469061ae2edSFred Isaman .error_cleanup = nfs_async_write_error, 1470061ae2edSFred Isaman .completion = nfs_write_completion, 1471dc602dd7STrond Myklebust .reschedule_io = nfs_async_write_reschedule_io, 1472061ae2edSFred Isaman }; 1473061ae2edSFred Isaman 147457208fa7SBryan Schumaker void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, 1475a20c93e3SChristoph Hellwig struct inode *inode, int ioflags, bool force_mds, 1476061ae2edSFred Isaman const struct nfs_pgio_completion_ops *compl_ops) 14771751c363STrond Myklebust { 1478a20c93e3SChristoph Hellwig struct nfs_server *server = NFS_SERVER(inode); 147941d8d5b7SAnna Schumaker const struct nfs_pageio_ops *pg_ops = &nfs_pgio_rw_ops; 1480a20c93e3SChristoph Hellwig 1481a20c93e3SChristoph Hellwig #ifdef CONFIG_NFS_V4_1 1482a20c93e3SChristoph Hellwig if (server->pnfs_curr_ld && !force_mds) 1483a20c93e3SChristoph Hellwig pg_ops = server->pnfs_curr_ld->pg_write_ops; 1484a20c93e3SChristoph Hellwig #endif 14854a0de55cSAnna Schumaker nfs_pageio_init(pgio, inode, pg_ops, compl_ops, &nfs_rw_write_ops, 14863bde7afdSTrond Myklebust server->wsize, ioflags); 14871751c363STrond Myklebust } 1488ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_pageio_init_write); 14891751c363STrond Myklebust 1490dce81290STrond Myklebust void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio) 1491dce81290STrond Myklebust { 1492a7d42ddbSWeston Andros Adamson struct nfs_pgio_mirror *mirror; 1493a7d42ddbSWeston Andros Adamson 14946f29b9bbSKinglong Mee if (pgio->pg_ops && pgio->pg_ops->pg_cleanup) 14956f29b9bbSKinglong Mee pgio->pg_ops->pg_cleanup(pgio); 14966f29b9bbSKinglong Mee 149741d8d5b7SAnna Schumaker pgio->pg_ops = &nfs_pgio_rw_ops; 1498a7d42ddbSWeston Andros Adamson 1499a7d42ddbSWeston Andros Adamson nfs_pageio_stop_mirroring(pgio); 1500a7d42ddbSWeston Andros Adamson 1501a7d42ddbSWeston Andros Adamson mirror = &pgio->pg_mirrors[0]; 1502a7d42ddbSWeston Andros Adamson mirror->pg_bsize = NFS_SERVER(pgio->pg_inode)->wsize; 1503dce81290STrond Myklebust } 15041f945357STrond Myklebust EXPORT_SYMBOL_GPL(nfs_pageio_reset_write_mds); 1505dce81290STrond Myklebust 15061da177e4SLinus Torvalds 15070b7c0153SFred Isaman void nfs_commit_prepare(struct rpc_task *task, void *calldata) 15080b7c0153SFred Isaman { 15090b7c0153SFred Isaman struct nfs_commit_data *data = calldata; 15100b7c0153SFred Isaman 15110b7c0153SFred Isaman NFS_PROTO(data->inode)->commit_rpc_prepare(task, data); 15120b7c0153SFred Isaman } 15130b7c0153SFred Isaman 15141f2edbe3STrond Myklebust /* 15151f2edbe3STrond Myklebust * Special version of should_remove_suid() that ignores capabilities. 15161f2edbe3STrond Myklebust */ 15171f2edbe3STrond Myklebust static int nfs_should_remove_suid(const struct inode *inode) 15181f2edbe3STrond Myklebust { 15191f2edbe3STrond Myklebust umode_t mode = inode->i_mode; 15201f2edbe3STrond Myklebust int kill = 0; 1521788e7a89STrond Myklebust 15221f2edbe3STrond Myklebust /* suid always must be killed */ 15231f2edbe3STrond Myklebust if (unlikely(mode & S_ISUID)) 15241f2edbe3STrond Myklebust kill = ATTR_KILL_SUID; 15251f2edbe3STrond Myklebust 15261f2edbe3STrond Myklebust /* 15271f2edbe3STrond Myklebust * sgid without any exec bits is just a mandatory locking mark; leave 15281f2edbe3STrond Myklebust * it alone. If some exec bits are set, it's a real sgid; kill it. 15291f2edbe3STrond Myklebust */ 15301f2edbe3STrond Myklebust if (unlikely((mode & S_ISGID) && (mode & S_IXGRP))) 15311f2edbe3STrond Myklebust kill |= ATTR_KILL_SGID; 15321f2edbe3STrond Myklebust 15331f2edbe3STrond Myklebust if (unlikely(kill && S_ISREG(mode))) 15341f2edbe3STrond Myklebust return kill; 15351f2edbe3STrond Myklebust 15361f2edbe3STrond Myklebust return 0; 15371f2edbe3STrond Myklebust } 1538788e7a89STrond Myklebust 1539a08a8cd3STrond Myklebust static void nfs_writeback_check_extend(struct nfs_pgio_header *hdr, 1540a08a8cd3STrond Myklebust struct nfs_fattr *fattr) 1541a08a8cd3STrond Myklebust { 1542a08a8cd3STrond Myklebust struct nfs_pgio_args *argp = &hdr->args; 1543a08a8cd3STrond Myklebust struct nfs_pgio_res *resp = &hdr->res; 15442b83d3deSTrond Myklebust u64 size = argp->offset + resp->count; 1545a08a8cd3STrond Myklebust 1546a08a8cd3STrond Myklebust if (!(fattr->valid & NFS_ATTR_FATTR_SIZE)) 15472b83d3deSTrond Myklebust fattr->size = size; 15482b83d3deSTrond Myklebust if (nfs_size_to_loff_t(fattr->size) < i_size_read(hdr->inode)) { 15492b83d3deSTrond Myklebust fattr->valid &= ~NFS_ATTR_FATTR_SIZE; 1550a08a8cd3STrond Myklebust return; 15512b83d3deSTrond Myklebust } 15522b83d3deSTrond Myklebust if (size != fattr->size) 1553a08a8cd3STrond Myklebust return; 1554a08a8cd3STrond Myklebust /* Set attribute barrier */ 1555a08a8cd3STrond Myklebust nfs_fattr_set_barrier(fattr); 15562b83d3deSTrond Myklebust /* ...and update size */ 15572b83d3deSTrond Myklebust fattr->valid |= NFS_ATTR_FATTR_SIZE; 1558a08a8cd3STrond Myklebust } 1559a08a8cd3STrond Myklebust 1560a08a8cd3STrond Myklebust void nfs_writeback_update_inode(struct nfs_pgio_header *hdr) 1561a08a8cd3STrond Myklebust { 15622b83d3deSTrond Myklebust struct nfs_fattr *fattr = &hdr->fattr; 1563a08a8cd3STrond Myklebust struct inode *inode = hdr->inode; 1564a08a8cd3STrond Myklebust 1565a08a8cd3STrond Myklebust spin_lock(&inode->i_lock); 1566a08a8cd3STrond Myklebust nfs_writeback_check_extend(hdr, fattr); 1567a08a8cd3STrond Myklebust nfs_post_op_update_inode_force_wcc_locked(inode, fattr); 1568a08a8cd3STrond Myklebust spin_unlock(&inode->i_lock); 1569a08a8cd3STrond Myklebust } 1570a08a8cd3STrond Myklebust EXPORT_SYMBOL_GPL(nfs_writeback_update_inode); 1571a08a8cd3STrond Myklebust 15721da177e4SLinus Torvalds /* 15731da177e4SLinus Torvalds * This function is called when the WRITE call is complete. 15741da177e4SLinus Torvalds */ 1575d45f60c6SWeston Andros Adamson static int nfs_writeback_done(struct rpc_task *task, 1576d45f60c6SWeston Andros Adamson struct nfs_pgio_header *hdr, 15770eecb214SAnna Schumaker struct inode *inode) 15781da177e4SLinus Torvalds { 1579788e7a89STrond Myklebust int status; 15801da177e4SLinus Torvalds 1581f551e44fSChuck Lever /* 1582f551e44fSChuck Lever * ->write_done will attempt to use post-op attributes to detect 1583f551e44fSChuck Lever * conflicting writes by other clients. A strict interpretation 1584f551e44fSChuck Lever * of close-to-open would allow us to continue caching even if 1585f551e44fSChuck Lever * another writer had changed the file, but some applications 1586f551e44fSChuck Lever * depend on tighter cache coherency when writing. 1587f551e44fSChuck Lever */ 1588d45f60c6SWeston Andros Adamson status = NFS_PROTO(inode)->write_done(task, hdr); 1589788e7a89STrond Myklebust if (status != 0) 15900eecb214SAnna Schumaker return status; 15918224b273SChuck Lever 1592d45f60c6SWeston Andros Adamson nfs_add_stats(inode, NFSIOS_SERVERWRITTENBYTES, hdr->res.count); 15935bb2a7cbSTrond Myklebust trace_nfs_writeback_done(task, hdr); 159491d5b470SChuck Lever 1595d45f60c6SWeston Andros Adamson if (hdr->res.verf->committed < hdr->args.stable && 1596d45f60c6SWeston Andros Adamson task->tk_status >= 0) { 15971da177e4SLinus Torvalds /* We tried a write call, but the server did not 15981da177e4SLinus Torvalds * commit data to stable storage even though we 15991da177e4SLinus Torvalds * requested it. 16001da177e4SLinus Torvalds * Note: There is a known bug in Tru64 < 5.0 in which 16011da177e4SLinus Torvalds * the server reports NFS_DATA_SYNC, but performs 16021da177e4SLinus Torvalds * NFS_FILE_SYNC. We therefore implement this checking 16031da177e4SLinus Torvalds * as a dprintk() in order to avoid filling syslog. 16041da177e4SLinus Torvalds */ 16051da177e4SLinus Torvalds static unsigned long complain; 16061da177e4SLinus Torvalds 1607a69aef14SFred Isaman /* Note this will print the MDS for a DS write */ 16081da177e4SLinus Torvalds if (time_before(complain, jiffies)) { 16091da177e4SLinus Torvalds dprintk("NFS: faulty NFS server %s:" 16101da177e4SLinus Torvalds " (committed = %d) != (stable = %d)\n", 1611cd841605SFred Isaman NFS_SERVER(inode)->nfs_client->cl_hostname, 1612d45f60c6SWeston Andros Adamson hdr->res.verf->committed, hdr->args.stable); 16131da177e4SLinus Torvalds complain = jiffies + 300 * HZ; 16141da177e4SLinus Torvalds } 16151da177e4SLinus Torvalds } 16161f2edbe3STrond Myklebust 16171f2edbe3STrond Myklebust /* Deal with the suid/sgid bit corner case */ 161816e14375STrond Myklebust if (nfs_should_remove_suid(inode)) { 161916e14375STrond Myklebust spin_lock(&inode->i_lock); 1620720869ebSTrond Myklebust nfs_set_cache_invalid(inode, NFS_INO_INVALID_MODE); 162116e14375STrond Myklebust spin_unlock(&inode->i_lock); 162216e14375STrond Myklebust } 16230eecb214SAnna Schumaker return 0; 16240eecb214SAnna Schumaker } 16250eecb214SAnna Schumaker 16260eecb214SAnna Schumaker /* 16270eecb214SAnna Schumaker * This function is called when the WRITE call is complete. 16280eecb214SAnna Schumaker */ 1629d45f60c6SWeston Andros Adamson static void nfs_writeback_result(struct rpc_task *task, 1630d45f60c6SWeston Andros Adamson struct nfs_pgio_header *hdr) 16310eecb214SAnna Schumaker { 1632d45f60c6SWeston Andros Adamson struct nfs_pgio_args *argp = &hdr->args; 1633d45f60c6SWeston Andros Adamson struct nfs_pgio_res *resp = &hdr->res; 16341f2edbe3STrond Myklebust 16351f2edbe3STrond Myklebust if (resp->count < argp->count) { 16361da177e4SLinus Torvalds static unsigned long complain; 16371da177e4SLinus Torvalds 16386c75dc0dSFred Isaman /* This a short write! */ 1639d45f60c6SWeston Andros Adamson nfs_inc_stats(hdr->inode, NFSIOS_SHORTWRITE); 164091d5b470SChuck Lever 16411da177e4SLinus Torvalds /* Has the server at least made some progress? */ 16426c75dc0dSFred Isaman if (resp->count == 0) { 16436c75dc0dSFred Isaman if (time_before(complain, jiffies)) { 16446c75dc0dSFred Isaman printk(KERN_WARNING 16456c75dc0dSFred Isaman "NFS: Server wrote zero bytes, expected %u.\n", 16466c75dc0dSFred Isaman argp->count); 16476c75dc0dSFred Isaman complain = jiffies + 300 * HZ; 16486c75dc0dSFred Isaman } 1649d45f60c6SWeston Andros Adamson nfs_set_pgio_error(hdr, -EIO, argp->offset); 16506c75dc0dSFred Isaman task->tk_status = -EIO; 16516c75dc0dSFred Isaman return; 16526c75dc0dSFred Isaman } 1653f8417b48SKinglong Mee 1654f8417b48SKinglong Mee /* For non rpc-based layout drivers, retry-through-MDS */ 1655f8417b48SKinglong Mee if (!task->tk_ops) { 1656f8417b48SKinglong Mee hdr->pnfs_error = -EAGAIN; 1657f8417b48SKinglong Mee return; 1658f8417b48SKinglong Mee } 1659f8417b48SKinglong Mee 16601da177e4SLinus Torvalds /* Was this an NFSv2 write or an NFSv3 stable write? */ 16611da177e4SLinus Torvalds if (resp->verf->committed != NFS_UNSTABLE) { 16621da177e4SLinus Torvalds /* Resend from where the server left off */ 1663d45f60c6SWeston Andros Adamson hdr->mds_offset += resp->count; 16641da177e4SLinus Torvalds argp->offset += resp->count; 16651da177e4SLinus Torvalds argp->pgbase += resp->count; 16661da177e4SLinus Torvalds argp->count -= resp->count; 16671da177e4SLinus Torvalds } else { 16681da177e4SLinus Torvalds /* Resend as a stable write in order to avoid 16691da177e4SLinus Torvalds * headaches in the case of a server crash. 16701da177e4SLinus Torvalds */ 16711da177e4SLinus Torvalds argp->stable = NFS_FILE_SYNC; 16721da177e4SLinus Torvalds } 16738c9cb714STrond Myklebust resp->count = 0; 16748c9cb714STrond Myklebust resp->verf->committed = 0; 1675d00c5d43STrond Myklebust rpc_restart_call_prepare(task); 16761da177e4SLinus Torvalds } 16771da177e4SLinus Torvalds } 16781da177e4SLinus Torvalds 1679af7cf057STrond Myklebust static int wait_on_commit(struct nfs_mds_commit_info *cinfo) 168071d0a611STrond Myklebust { 1681723c921eSPeter Zijlstra return wait_var_event_killable(&cinfo->rpcs_out, 1682723c921eSPeter Zijlstra !atomic_read(&cinfo->rpcs_out)); 1683af7cf057STrond Myklebust } 1684af7cf057STrond Myklebust 1685af7cf057STrond Myklebust static void nfs_commit_begin(struct nfs_mds_commit_info *cinfo) 1686af7cf057STrond Myklebust { 1687af7cf057STrond Myklebust atomic_inc(&cinfo->rpcs_out); 1688af7cf057STrond Myklebust } 1689af7cf057STrond Myklebust 1690af7cf057STrond Myklebust static void nfs_commit_end(struct nfs_mds_commit_info *cinfo) 1691af7cf057STrond Myklebust { 1692af7cf057STrond Myklebust if (atomic_dec_and_test(&cinfo->rpcs_out)) 1693723c921eSPeter Zijlstra wake_up_var(&cinfo->rpcs_out); 169471d0a611STrond Myklebust } 169571d0a611STrond Myklebust 16960b7c0153SFred Isaman void nfs_commitdata_release(struct nfs_commit_data *data) 16971da177e4SLinus Torvalds { 16980b7c0153SFred Isaman put_nfs_open_context(data->context); 16990b7c0153SFred Isaman nfs_commit_free(data); 17001da177e4SLinus Torvalds } 1701e0c2b380SFred Isaman EXPORT_SYMBOL_GPL(nfs_commitdata_release); 17021da177e4SLinus Torvalds 17030b7c0153SFred Isaman int nfs_initiate_commit(struct rpc_clnt *clnt, struct nfs_commit_data *data, 1704c36aae9aSPeng Tao const struct nfs_rpc_ops *nfs_ops, 17059ace33cdSFred Isaman const struct rpc_call_ops *call_ops, 17069f0ec176SAndy Adamson int how, int flags) 17071da177e4SLinus Torvalds { 170807737691STrond Myklebust struct rpc_task *task; 17099ace33cdSFred Isaman int priority = flush_task_priority(how); 1710bdc7f021STrond Myklebust struct rpc_message msg = { 1711bdc7f021STrond Myklebust .rpc_argp = &data->args, 1712bdc7f021STrond Myklebust .rpc_resp = &data->res, 17139ace33cdSFred Isaman .rpc_cred = data->cred, 1714bdc7f021STrond Myklebust }; 171584115e1cSTrond Myklebust struct rpc_task_setup task_setup_data = { 171607737691STrond Myklebust .task = &data->task, 17179ace33cdSFred Isaman .rpc_client = clnt, 1718bdc7f021STrond Myklebust .rpc_message = &msg, 17199ace33cdSFred Isaman .callback_ops = call_ops, 172084115e1cSTrond Myklebust .callback_data = data, 1721101070caSTrond Myklebust .workqueue = nfsiod_workqueue, 17224fa7ef69STrond Myklebust .flags = RPC_TASK_ASYNC | flags, 17233ff7576dSTrond Myklebust .priority = priority, 172484115e1cSTrond Myklebust }; 1725788e7a89STrond Myklebust /* Set up the initial task struct. */ 1726e9ae1ee2SAnna Schumaker nfs_ops->commit_setup(data, &msg, &task_setup_data.rpc_client); 17278224b273SChuck Lever trace_nfs_initiate_commit(data); 17281da177e4SLinus Torvalds 1729b4839ebeSKinglong Mee dprintk("NFS: initiated commit call\n"); 1730bdc7f021STrond Myklebust 173107737691STrond Myklebust task = rpc_run_task(&task_setup_data); 1732dbae4c73STrond Myklebust if (IS_ERR(task)) 1733dbae4c73STrond Myklebust return PTR_ERR(task); 1734d2224e7aSJeff Layton if (how & FLUSH_SYNC) 1735d2224e7aSJeff Layton rpc_wait_for_completion_task(task); 173607737691STrond Myklebust rpc_put_task(task); 1737dbae4c73STrond Myklebust return 0; 17381da177e4SLinus Torvalds } 1739e0c2b380SFred Isaman EXPORT_SYMBOL_GPL(nfs_initiate_commit); 17401da177e4SLinus Torvalds 1741378520b8SPeng Tao static loff_t nfs_get_lwb(struct list_head *head) 1742378520b8SPeng Tao { 1743378520b8SPeng Tao loff_t lwb = 0; 1744378520b8SPeng Tao struct nfs_page *req; 1745378520b8SPeng Tao 1746378520b8SPeng Tao list_for_each_entry(req, head, wb_list) 1747378520b8SPeng Tao if (lwb < (req_offset(req) + req->wb_bytes)) 1748378520b8SPeng Tao lwb = req_offset(req) + req->wb_bytes; 1749378520b8SPeng Tao 1750378520b8SPeng Tao return lwb; 1751378520b8SPeng Tao } 1752378520b8SPeng Tao 17531da177e4SLinus Torvalds /* 17549ace33cdSFred Isaman * Set up the argument/result storage required for the RPC call. 17559ace33cdSFred Isaman */ 17560b7c0153SFred Isaman void nfs_init_commit(struct nfs_commit_data *data, 1757988b6dceSFred Isaman struct list_head *head, 1758f453a54aSFred Isaman struct pnfs_layout_segment *lseg, 1759f453a54aSFred Isaman struct nfs_commit_info *cinfo) 17609ace33cdSFred Isaman { 176119573c93STrond Myklebust struct nfs_page *first; 176219573c93STrond Myklebust struct nfs_open_context *ctx; 176319573c93STrond Myklebust struct inode *inode; 17649ace33cdSFred Isaman 17659ace33cdSFred Isaman /* Set up the RPC argument and reply structs 17669ace33cdSFred Isaman * NB: take care not to mess about with data->commit et al. */ 17679ace33cdSFred Isaman 176819573c93STrond Myklebust if (head) 17699ace33cdSFred Isaman list_splice_init(head, &data->pages); 17709ace33cdSFred Isaman 177119573c93STrond Myklebust first = nfs_list_entry(data->pages.next); 177219573c93STrond Myklebust ctx = nfs_req_openctx(first); 177319573c93STrond Myklebust inode = d_inode(ctx->dentry); 177419573c93STrond Myklebust 17759ace33cdSFred Isaman data->inode = inode; 17769fcd5960STrond Myklebust data->cred = ctx->cred; 1777988b6dceSFred Isaman data->lseg = lseg; /* reference transferred */ 1778378520b8SPeng Tao /* only set lwb for pnfs commit */ 1779378520b8SPeng Tao if (lseg) 1780378520b8SPeng Tao data->lwb = nfs_get_lwb(&data->pages); 17819ace33cdSFred Isaman data->mds_ops = &nfs_commit_ops; 1782f453a54aSFred Isaman data->completion_ops = cinfo->completion_ops; 1783b359f9d0SFred Isaman data->dreq = cinfo->dreq; 17849ace33cdSFred Isaman 17859ace33cdSFred Isaman data->args.fh = NFS_FH(data->inode); 17869ace33cdSFred Isaman /* Note: we always request a commit of the entire inode */ 17879ace33cdSFred Isaman data->args.offset = 0; 17889ace33cdSFred Isaman data->args.count = 0; 17899fcd5960STrond Myklebust data->context = get_nfs_open_context(ctx); 17909ace33cdSFred Isaman data->res.fattr = &data->fattr; 17919ace33cdSFred Isaman data->res.verf = &data->verf; 17929ace33cdSFred Isaman nfs_fattr_init(&data->fattr); 17939ace33cdSFred Isaman } 1794e0c2b380SFred Isaman EXPORT_SYMBOL_GPL(nfs_init_commit); 17959ace33cdSFred Isaman 1796e0c2b380SFred Isaman void nfs_retry_commit(struct list_head *page_list, 1797ea2cf228SFred Isaman struct pnfs_layout_segment *lseg, 1798b57ff130SWeston Andros Adamson struct nfs_commit_info *cinfo, 1799b57ff130SWeston Andros Adamson u32 ds_commit_idx) 180064bfeb49SFred Isaman { 180164bfeb49SFred Isaman struct nfs_page *req; 180264bfeb49SFred Isaman 180364bfeb49SFred Isaman while (!list_empty(page_list)) { 180464bfeb49SFred Isaman req = nfs_list_entry(page_list->next); 180564bfeb49SFred Isaman nfs_list_remove_request(req); 1806b57ff130SWeston Andros Adamson nfs_mark_request_commit(req, lseg, cinfo, ds_commit_idx); 1807487b9b8aSTom Haynes if (!cinfo->dreq) 1808487b9b8aSTom Haynes nfs_clear_page_commit(req->wb_page); 18091d1afcbcSTrond Myklebust nfs_unlock_and_release_request(req); 181064bfeb49SFred Isaman } 181164bfeb49SFred Isaman } 1812e0c2b380SFred Isaman EXPORT_SYMBOL_GPL(nfs_retry_commit); 181364bfeb49SFred Isaman 1814b20135d0STrond Myklebust static void 1815b20135d0STrond Myklebust nfs_commit_resched_write(struct nfs_commit_info *cinfo, 1816b20135d0STrond Myklebust struct nfs_page *req) 1817b20135d0STrond Myklebust { 1818b20135d0STrond Myklebust __set_page_dirty_nobuffers(req->wb_page); 1819b20135d0STrond Myklebust } 1820b20135d0STrond Myklebust 18219ace33cdSFred Isaman /* 18221da177e4SLinus Torvalds * Commit dirty pages 18231da177e4SLinus Torvalds */ 18241da177e4SLinus Torvalds static int 1825ea2cf228SFred Isaman nfs_commit_list(struct inode *inode, struct list_head *head, int how, 1826ea2cf228SFred Isaman struct nfs_commit_info *cinfo) 18271da177e4SLinus Torvalds { 18280b7c0153SFred Isaman struct nfs_commit_data *data; 182985e39feeSOlga Kornievskaia unsigned short task_flags = 0; 18301da177e4SLinus Torvalds 1831ade8febdSWeston Andros Adamson /* another commit raced with us */ 1832ade8febdSWeston Andros Adamson if (list_empty(head)) 1833ade8febdSWeston Andros Adamson return 0; 1834ade8febdSWeston Andros Adamson 1835518662e0SNeilBrown data = nfs_commitdata_alloc(true); 18361da177e4SLinus Torvalds 18371da177e4SLinus Torvalds /* Set up the argument struct */ 1838f453a54aSFred Isaman nfs_init_commit(data, head, NULL, cinfo); 1839f453a54aSFred Isaman atomic_inc(&cinfo->mds->rpcs_out); 184085e39feeSOlga Kornievskaia if (NFS_SERVER(inode)->nfs_client->cl_minorversion) 184185e39feeSOlga Kornievskaia task_flags = RPC_TASK_MOVEABLE; 1842c36aae9aSPeng Tao return nfs_initiate_commit(NFS_CLIENT(inode), data, NFS_PROTO(inode), 184385e39feeSOlga Kornievskaia data->mds_ops, how, 184485e39feeSOlga Kornievskaia RPC_TASK_CRED_NOREF | task_flags); 18451da177e4SLinus Torvalds } 18461da177e4SLinus Torvalds 18471da177e4SLinus Torvalds /* 18481da177e4SLinus Torvalds * COMMIT call returned 18491da177e4SLinus Torvalds */ 1850788e7a89STrond Myklebust static void nfs_commit_done(struct rpc_task *task, void *calldata) 18511da177e4SLinus Torvalds { 18520b7c0153SFred Isaman struct nfs_commit_data *data = calldata; 18531da177e4SLinus Torvalds 1854a3f565b1SChuck Lever dprintk("NFS: %5u nfs_commit_done (status %d)\n", 18551da177e4SLinus Torvalds task->tk_pid, task->tk_status); 18561da177e4SLinus Torvalds 1857788e7a89STrond Myklebust /* Call the NFS version-specific code */ 1858c0d0e96bSTrond Myklebust NFS_PROTO(data->inode)->commit_done(task, data); 18597bdd297eSTrond Myklebust trace_nfs_commit_done(task, data); 1860c9d8f89dSTrond Myklebust } 1861c9d8f89dSTrond Myklebust 1862f453a54aSFred Isaman static void nfs_commit_release_pages(struct nfs_commit_data *data) 1863c9d8f89dSTrond Myklebust { 1864221203ceSTrond Myklebust const struct nfs_writeverf *verf = data->res.verf; 1865c9d8f89dSTrond Myklebust struct nfs_page *req; 1866c9d8f89dSTrond Myklebust int status = data->task.tk_status; 1867f453a54aSFred Isaman struct nfs_commit_info cinfo; 1868353db796SNeilBrown struct nfs_server *nfss; 1869788e7a89STrond Myklebust 18701da177e4SLinus Torvalds while (!list_empty(&data->pages)) { 18711da177e4SLinus Torvalds req = nfs_list_entry(data->pages.next); 18721da177e4SLinus Torvalds nfs_list_remove_request(req); 187367911c8fSAnna Schumaker if (req->wb_page) 1874d6d6dc7cSFred Isaman nfs_clear_page_commit(req->wb_page); 18751da177e4SLinus Torvalds 18761e8968c5SNiels de Vos dprintk("NFS: commit (%s/%llu %d@%lld)", 18779fcd5960STrond Myklebust nfs_req_openctx(req)->dentry->d_sb->s_id, 18789fcd5960STrond Myklebust (unsigned long long)NFS_FILEID(d_inode(nfs_req_openctx(req)->dentry)), 18791da177e4SLinus Torvalds req->wb_bytes, 18801da177e4SLinus Torvalds (long long)req_offset(req)); 1881c9d8f89dSTrond Myklebust if (status < 0) { 18826fbda89bSTrond Myklebust if (req->wb_page) { 1883861e1671SChuck Lever trace_nfs_commit_error(req, status); 18846fbda89bSTrond Myklebust nfs_mapping_set_error(req->wb_page, status); 18851da177e4SLinus Torvalds nfs_inode_remove_request(req); 18866fbda89bSTrond Myklebust } 1887ddeaa637SJoe Perches dprintk_cont(", error = %d\n", status); 18881da177e4SLinus Torvalds goto next; 18891da177e4SLinus Torvalds } 18901da177e4SLinus Torvalds 18911da177e4SLinus Torvalds /* Okay, COMMIT succeeded, apparently. Check the verifier 18921da177e4SLinus Torvalds * returned by the server against all stored verfs. */ 18931f28476dSTrond Myklebust if (nfs_write_match_verf(verf, req)) { 18941da177e4SLinus Torvalds /* We have a match */ 189538a33101SKinglong Mee if (req->wb_page) 18961da177e4SLinus Torvalds nfs_inode_remove_request(req); 1897ddeaa637SJoe Perches dprintk_cont(" OK\n"); 18981da177e4SLinus Torvalds goto next; 18991da177e4SLinus Torvalds } 19001da177e4SLinus Torvalds /* We have a mismatch. Write the page again */ 1901ddeaa637SJoe Perches dprintk_cont(" mismatch\n"); 19026d884e8fSFred nfs_mark_request_dirty(req); 19039fcd5960STrond Myklebust set_bit(NFS_CONTEXT_RESEND_WRITES, &nfs_req_openctx(req)->flags); 19041da177e4SLinus Torvalds next: 19051d1afcbcSTrond Myklebust nfs_unlock_and_release_request(req); 19067f1bda44STrond Myklebust /* Latency breaker */ 19077f1bda44STrond Myklebust cond_resched(); 19081da177e4SLinus Torvalds } 1909353db796SNeilBrown nfss = NFS_SERVER(data->inode); 1910353db796SNeilBrown if (atomic_long_read(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH) 19110db10944SJan Kara clear_bdi_congested(inode_to_bdi(data->inode), BLK_RW_ASYNC); 1912353db796SNeilBrown 1913f453a54aSFred Isaman nfs_init_cinfo(&cinfo, data->inode, data->dreq); 1914af7cf057STrond Myklebust nfs_commit_end(cinfo.mds); 19155917ce84SFred Isaman } 19165917ce84SFred Isaman 19175917ce84SFred Isaman static void nfs_commit_release(void *calldata) 19185917ce84SFred Isaman { 19190b7c0153SFred Isaman struct nfs_commit_data *data = calldata; 19205917ce84SFred Isaman 1921f453a54aSFred Isaman data->completion_ops->completion(data); 1922c9d8f89dSTrond Myklebust nfs_commitdata_release(calldata); 19231da177e4SLinus Torvalds } 1924788e7a89STrond Myklebust 1925788e7a89STrond Myklebust static const struct rpc_call_ops nfs_commit_ops = { 19260b7c0153SFred Isaman .rpc_call_prepare = nfs_commit_prepare, 1927788e7a89STrond Myklebust .rpc_call_done = nfs_commit_done, 1928788e7a89STrond Myklebust .rpc_release = nfs_commit_release, 1929788e7a89STrond Myklebust }; 19301da177e4SLinus Torvalds 1931f453a54aSFred Isaman static const struct nfs_commit_completion_ops nfs_commit_completion_ops = { 1932f453a54aSFred Isaman .completion = nfs_commit_release_pages, 1933b20135d0STrond Myklebust .resched_write = nfs_commit_resched_write, 1934f453a54aSFred Isaman }; 1935f453a54aSFred Isaman 19361763da12SFred Isaman int nfs_generic_commit_list(struct inode *inode, struct list_head *head, 1937ea2cf228SFred Isaman int how, struct nfs_commit_info *cinfo) 193884c53ab5SFred Isaman { 193984c53ab5SFred Isaman int status; 194084c53ab5SFred Isaman 1941ea2cf228SFred Isaman status = pnfs_commit_list(inode, head, how, cinfo); 194284c53ab5SFred Isaman if (status == PNFS_NOT_ATTEMPTED) 1943ea2cf228SFred Isaman status = nfs_commit_list(inode, head, how, cinfo); 194484c53ab5SFred Isaman return status; 194584c53ab5SFred Isaman } 194684c53ab5SFred Isaman 1947c4f24df9STrond Myklebust static int __nfs_commit_inode(struct inode *inode, int how, 1948c4f24df9STrond Myklebust struct writeback_control *wbc) 19491da177e4SLinus Torvalds { 19501da177e4SLinus Torvalds LIST_HEAD(head); 1951ea2cf228SFred Isaman struct nfs_commit_info cinfo; 195271d0a611STrond Myklebust int may_wait = how & FLUSH_SYNC; 1953c4f24df9STrond Myklebust int ret, nscan; 19541da177e4SLinus Torvalds 1955ea2cf228SFred Isaman nfs_init_cinfo_from_inode(&cinfo, inode); 1956af7cf057STrond Myklebust nfs_commit_begin(cinfo.mds); 1957c4f24df9STrond Myklebust for (;;) { 1958c4f24df9STrond Myklebust ret = nscan = nfs_scan_commit(inode, &head, &cinfo); 1959c4f24df9STrond Myklebust if (ret <= 0) 1960c4f24df9STrond Myklebust break; 1961c4f24df9STrond Myklebust ret = nfs_generic_commit_list(inode, &head, how, &cinfo); 1962c4f24df9STrond Myklebust if (ret < 0) 1963c4f24df9STrond Myklebust break; 1964c4f24df9STrond Myklebust ret = 0; 1965c4f24df9STrond Myklebust if (wbc && wbc->sync_mode == WB_SYNC_NONE) { 1966c4f24df9STrond Myklebust if (nscan < wbc->nr_to_write) 1967c4f24df9STrond Myklebust wbc->nr_to_write -= nscan; 1968c4f24df9STrond Myklebust else 1969c4f24df9STrond Myklebust wbc->nr_to_write = 0; 1970c4f24df9STrond Myklebust } 1971c4f24df9STrond Myklebust if (nscan < INT_MAX) 1972c4f24df9STrond Myklebust break; 1973c4f24df9STrond Myklebust cond_resched(); 1974c4f24df9STrond Myklebust } 1975af7cf057STrond Myklebust nfs_commit_end(cinfo.mds); 1976c4f24df9STrond Myklebust if (ret || !may_wait) 1977c4f24df9STrond Myklebust return ret; 1978c4f24df9STrond Myklebust return wait_on_commit(cinfo.mds); 1979c4f24df9STrond Myklebust } 1980c4f24df9STrond Myklebust 1981c4f24df9STrond Myklebust int nfs_commit_inode(struct inode *inode, int how) 1982c4f24df9STrond Myklebust { 1983c4f24df9STrond Myklebust return __nfs_commit_inode(inode, how, NULL); 19841da177e4SLinus Torvalds } 1985b20135d0STrond Myklebust EXPORT_SYMBOL_GPL(nfs_commit_inode); 19868fc795f7STrond Myklebust 1987ae09c31fSAnna Schumaker int nfs_write_inode(struct inode *inode, struct writeback_control *wbc) 19888fc795f7STrond Myklebust { 1989420e3646STrond Myklebust struct nfs_inode *nfsi = NFS_I(inode); 1990420e3646STrond Myklebust int flags = FLUSH_SYNC; 1991420e3646STrond Myklebust int ret = 0; 19928fc795f7STrond Myklebust 1993c4f24df9STrond Myklebust if (wbc->sync_mode == WB_SYNC_NONE) { 19943236c3e1SJeff Layton /* no commits means nothing needs to be done */ 19955cb953d4STrond Myklebust if (!atomic_long_read(&nfsi->commit_info.ncommit)) 1996c4f24df9STrond Myklebust goto check_requests_outstanding; 19973236c3e1SJeff Layton 1998a00dd6c0SJeff Layton /* Don't commit yet if this is a non-blocking flush and there 1999a00dd6c0SJeff Layton * are a lot of outstanding writes for this mapping. 2000420e3646STrond Myklebust */ 20011a4edf0fSTrond Myklebust if (mapping_tagged(inode->i_mapping, PAGECACHE_TAG_WRITEBACK)) 2002420e3646STrond Myklebust goto out_mark_dirty; 2003420e3646STrond Myklebust 2004a00dd6c0SJeff Layton /* don't wait for the COMMIT response */ 2005420e3646STrond Myklebust flags = 0; 2006a00dd6c0SJeff Layton } 2007a00dd6c0SJeff Layton 2008c4f24df9STrond Myklebust ret = __nfs_commit_inode(inode, flags, wbc); 2009c4f24df9STrond Myklebust if (!ret) { 2010c4f24df9STrond Myklebust if (flags & FLUSH_SYNC) 20118fc795f7STrond Myklebust return 0; 2012c4f24df9STrond Myklebust } else if (atomic_long_read(&nfsi->commit_info.ncommit)) 2013c4f24df9STrond Myklebust goto out_mark_dirty; 2014c4f24df9STrond Myklebust 2015c4f24df9STrond Myklebust check_requests_outstanding: 2016c4f24df9STrond Myklebust if (!atomic_read(&nfsi->commit_info.rpcs_out)) 2017c4f24df9STrond Myklebust return ret; 2018420e3646STrond Myklebust out_mark_dirty: 20198fc795f7STrond Myklebust __mark_inode_dirty(inode, I_DIRTY_DATASYNC); 20208fc795f7STrond Myklebust return ret; 20218fc795f7STrond Myklebust } 202289d77c8fSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_write_inode); 2023863a3c6cSAndy Adamson 2024acdc53b2STrond Myklebust /* 2025837bb1d7STrond Myklebust * Wrapper for filemap_write_and_wait_range() 2026837bb1d7STrond Myklebust * 2027837bb1d7STrond Myklebust * Needed for pNFS in order to ensure data becomes visible to the 2028837bb1d7STrond Myklebust * client. 2029837bb1d7STrond Myklebust */ 2030837bb1d7STrond Myklebust int nfs_filemap_write_and_wait_range(struct address_space *mapping, 2031837bb1d7STrond Myklebust loff_t lstart, loff_t lend) 2032837bb1d7STrond Myklebust { 2033837bb1d7STrond Myklebust int ret; 2034837bb1d7STrond Myklebust 2035837bb1d7STrond Myklebust ret = filemap_write_and_wait_range(mapping, lstart, lend); 2036837bb1d7STrond Myklebust if (ret == 0) 2037837bb1d7STrond Myklebust ret = pnfs_sync_inode(mapping->host, true); 2038837bb1d7STrond Myklebust return ret; 2039837bb1d7STrond Myklebust } 2040837bb1d7STrond Myklebust EXPORT_SYMBOL_GPL(nfs_filemap_write_and_wait_range); 2041837bb1d7STrond Myklebust 2042837bb1d7STrond Myklebust /* 2043acdc53b2STrond Myklebust * flush the inode to disk. 2044acdc53b2STrond Myklebust */ 2045acdc53b2STrond Myklebust int nfs_wb_all(struct inode *inode) 204634901f70STrond Myklebust { 2047f4ce1299STrond Myklebust int ret; 204834901f70STrond Myklebust 2049f4ce1299STrond Myklebust trace_nfs_writeback_inode_enter(inode); 2050f4ce1299STrond Myklebust 20515bb89b47STrond Myklebust ret = filemap_write_and_wait(inode->i_mapping); 20526b196875SChuck Lever if (ret) 20536b196875SChuck Lever goto out; 20545bb89b47STrond Myklebust ret = nfs_commit_inode(inode, FLUSH_SYNC); 20556b196875SChuck Lever if (ret < 0) 20566b196875SChuck Lever goto out; 20575bb89b47STrond Myklebust pnfs_sync_inode(inode, true); 20586b196875SChuck Lever ret = 0; 2059f4ce1299STrond Myklebust 20606b196875SChuck Lever out: 2061f4ce1299STrond Myklebust trace_nfs_writeback_inode_exit(inode, ret); 2062f4ce1299STrond Myklebust return ret; 20631c75950bSTrond Myklebust } 2064ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_wb_all); 20651c75950bSTrond Myklebust 20661b3b4a1aSTrond Myklebust int nfs_wb_page_cancel(struct inode *inode, struct page *page) 20671b3b4a1aSTrond Myklebust { 20681b3b4a1aSTrond Myklebust struct nfs_page *req; 20691b3b4a1aSTrond Myklebust int ret = 0; 20701b3b4a1aSTrond Myklebust 2071ba8b06e6STrond Myklebust wait_on_page_writeback(page); 20723e217045SWeston Andros Adamson 20733e217045SWeston Andros Adamson /* blocking call to cancel all requests and join to a single (head) 20743e217045SWeston Andros Adamson * request */ 20756d17d653STrond Myklebust req = nfs_lock_and_join_requests(page); 20763e217045SWeston Andros Adamson 20773e217045SWeston Andros Adamson if (IS_ERR(req)) { 20783e217045SWeston Andros Adamson ret = PTR_ERR(req); 20793e217045SWeston Andros Adamson } else if (req) { 20803e217045SWeston Andros Adamson /* all requests from this page have been cancelled by 20813e217045SWeston Andros Adamson * nfs_lock_and_join_requests, so just remove the head 20823e217045SWeston Andros Adamson * request from the inode / page_private pointer and 20833e217045SWeston Andros Adamson * release it */ 20841b3b4a1aSTrond Myklebust nfs_inode_remove_request(req); 20851d1afcbcSTrond Myklebust nfs_unlock_and_release_request(req); 20861b3b4a1aSTrond Myklebust } 20873e217045SWeston Andros Adamson 20881b3b4a1aSTrond Myklebust return ret; 20891b3b4a1aSTrond Myklebust } 20901b3b4a1aSTrond Myklebust 20911c75950bSTrond Myklebust /* 20921c75950bSTrond Myklebust * Write back all requests on one page - we do this before reading it. 20931c75950bSTrond Myklebust */ 2094c373fff7STrond Myklebust int nfs_wb_page(struct inode *inode, struct page *page) 20951c75950bSTrond Myklebust { 209629418aa4SMel Gorman loff_t range_start = page_file_offset(page); 209709cbfeafSKirill A. Shutemov loff_t range_end = range_start + (loff_t)(PAGE_SIZE - 1); 20987f2f12d9STrond Myklebust struct writeback_control wbc = { 20997f2f12d9STrond Myklebust .sync_mode = WB_SYNC_ALL, 21007f2f12d9STrond Myklebust .nr_to_write = 0, 21017f2f12d9STrond Myklebust .range_start = range_start, 21027f2f12d9STrond Myklebust .range_end = range_end, 21037f2f12d9STrond Myklebust }; 21047f2f12d9STrond Myklebust int ret; 21057f2f12d9STrond Myklebust 2106f4ce1299STrond Myklebust trace_nfs_writeback_page_enter(inode); 2107f4ce1299STrond Myklebust 21080522f6adSTrond Myklebust for (;;) { 2109ba8b06e6STrond Myklebust wait_on_page_writeback(page); 21107f2f12d9STrond Myklebust if (clear_page_dirty_for_io(page)) { 2111c373fff7STrond Myklebust ret = nfs_writepage_locked(page, &wbc); 21127f2f12d9STrond Myklebust if (ret < 0) 21137f2f12d9STrond Myklebust goto out_error; 21140522f6adSTrond Myklebust continue; 21157f2f12d9STrond Myklebust } 2116f4ce1299STrond Myklebust ret = 0; 21170522f6adSTrond Myklebust if (!PagePrivate(page)) 21180522f6adSTrond Myklebust break; 21190522f6adSTrond Myklebust ret = nfs_commit_inode(inode, FLUSH_SYNC); 21207f2f12d9STrond Myklebust if (ret < 0) 21217f2f12d9STrond Myklebust goto out_error; 21227f2f12d9STrond Myklebust } 21237f2f12d9STrond Myklebust out_error: 2124f4ce1299STrond Myklebust trace_nfs_writeback_page_exit(inode, ret); 21257f2f12d9STrond Myklebust return ret; 21261c75950bSTrond Myklebust } 21271c75950bSTrond Myklebust 2128074cc1deSTrond Myklebust #ifdef CONFIG_MIGRATION 2129074cc1deSTrond Myklebust int nfs_migrate_page(struct address_space *mapping, struct page *newpage, 2130a6bc32b8SMel Gorman struct page *page, enum migrate_mode mode) 2131074cc1deSTrond Myklebust { 21322da95652SJeff Layton /* 21332da95652SJeff Layton * If PagePrivate is set, then the page is currently associated with 21342da95652SJeff Layton * an in-progress read or write request. Don't try to migrate it. 21352da95652SJeff Layton * 21362da95652SJeff Layton * FIXME: we could do this in principle, but we'll need a way to ensure 21372da95652SJeff Layton * that we can safely release the inode reference while holding 21382da95652SJeff Layton * the page lock. 21392da95652SJeff Layton */ 21402da95652SJeff Layton if (PagePrivate(page)) 21412da95652SJeff Layton return -EBUSY; 2142074cc1deSTrond Myklebust 21438c209ce7SDavid Howells if (!nfs_fscache_release_page(page, GFP_KERNEL)) 21448c209ce7SDavid Howells return -EBUSY; 2145074cc1deSTrond Myklebust 2146a6bc32b8SMel Gorman return migrate_page(mapping, newpage, page, mode); 2147074cc1deSTrond Myklebust } 2148074cc1deSTrond Myklebust #endif 2149074cc1deSTrond Myklebust 2150f7b422b1SDavid Howells int __init nfs_init_writepagecache(void) 21511da177e4SLinus Torvalds { 21521da177e4SLinus Torvalds nfs_wdata_cachep = kmem_cache_create("nfs_write_data", 21531e7f3a48SWeston Andros Adamson sizeof(struct nfs_pgio_header), 21541da177e4SLinus Torvalds 0, SLAB_HWCACHE_ALIGN, 215520c2df83SPaul Mundt NULL); 21561da177e4SLinus Torvalds if (nfs_wdata_cachep == NULL) 21571da177e4SLinus Torvalds return -ENOMEM; 21581da177e4SLinus Torvalds 215993d2341cSMatthew Dobson nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE, 21601da177e4SLinus Torvalds nfs_wdata_cachep); 21611da177e4SLinus Torvalds if (nfs_wdata_mempool == NULL) 21623dd4765fSJeff Layton goto out_destroy_write_cache; 21631da177e4SLinus Torvalds 21640b7c0153SFred Isaman nfs_cdata_cachep = kmem_cache_create("nfs_commit_data", 21650b7c0153SFred Isaman sizeof(struct nfs_commit_data), 21660b7c0153SFred Isaman 0, SLAB_HWCACHE_ALIGN, 21670b7c0153SFred Isaman NULL); 21680b7c0153SFred Isaman if (nfs_cdata_cachep == NULL) 21693dd4765fSJeff Layton goto out_destroy_write_mempool; 21700b7c0153SFred Isaman 217193d2341cSMatthew Dobson nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT, 21724c100210SYanchuan Nian nfs_cdata_cachep); 21731da177e4SLinus Torvalds if (nfs_commit_mempool == NULL) 21743dd4765fSJeff Layton goto out_destroy_commit_cache; 21751da177e4SLinus Torvalds 217689a09141SPeter Zijlstra /* 217789a09141SPeter Zijlstra * NFS congestion size, scale with available memory. 217889a09141SPeter Zijlstra * 217989a09141SPeter Zijlstra * 64MB: 8192k 218089a09141SPeter Zijlstra * 128MB: 11585k 218189a09141SPeter Zijlstra * 256MB: 16384k 218289a09141SPeter Zijlstra * 512MB: 23170k 218389a09141SPeter Zijlstra * 1GB: 32768k 218489a09141SPeter Zijlstra * 2GB: 46340k 218589a09141SPeter Zijlstra * 4GB: 65536k 218689a09141SPeter Zijlstra * 8GB: 92681k 218789a09141SPeter Zijlstra * 16GB: 131072k 218889a09141SPeter Zijlstra * 218989a09141SPeter Zijlstra * This allows larger machines to have larger/more transfers. 219089a09141SPeter Zijlstra * Limit the default to 256M 219189a09141SPeter Zijlstra */ 2192ca79b0c2SArun KS nfs_congestion_kb = (16*int_sqrt(totalram_pages())) << (PAGE_SHIFT-10); 219389a09141SPeter Zijlstra if (nfs_congestion_kb > 256*1024) 219489a09141SPeter Zijlstra nfs_congestion_kb = 256*1024; 219589a09141SPeter Zijlstra 21961da177e4SLinus Torvalds return 0; 21973dd4765fSJeff Layton 21983dd4765fSJeff Layton out_destroy_commit_cache: 21993dd4765fSJeff Layton kmem_cache_destroy(nfs_cdata_cachep); 22003dd4765fSJeff Layton out_destroy_write_mempool: 22013dd4765fSJeff Layton mempool_destroy(nfs_wdata_mempool); 22023dd4765fSJeff Layton out_destroy_write_cache: 22033dd4765fSJeff Layton kmem_cache_destroy(nfs_wdata_cachep); 22043dd4765fSJeff Layton return -ENOMEM; 22051da177e4SLinus Torvalds } 22061da177e4SLinus Torvalds 2207266bee88SDavid Brownell void nfs_destroy_writepagecache(void) 22081da177e4SLinus Torvalds { 22091da177e4SLinus Torvalds mempool_destroy(nfs_commit_mempool); 22103dd4765fSJeff Layton kmem_cache_destroy(nfs_cdata_cachep); 22111da177e4SLinus Torvalds mempool_destroy(nfs_wdata_mempool); 22121a1d92c1SAlexey Dobriyan kmem_cache_destroy(nfs_wdata_cachep); 22131da177e4SLinus Torvalds } 22141da177e4SLinus Torvalds 22154a0de55cSAnna Schumaker static const struct nfs_rw_ops nfs_rw_write_ops = { 22164a0de55cSAnna Schumaker .rw_alloc_header = nfs_writehdr_alloc, 22174a0de55cSAnna Schumaker .rw_free_header = nfs_writehdr_free, 22180eecb214SAnna Schumaker .rw_done = nfs_writeback_done, 22190eecb214SAnna Schumaker .rw_result = nfs_writeback_result, 22201ed26f33SAnna Schumaker .rw_initiate = nfs_initiate_write, 22214a0de55cSAnna Schumaker }; 2222