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 73515dcdcdSTrond Myklebust struct nfs_commit_data *nfs_commitdata_alloc(void) 741da177e4SLinus Torvalds { 75518662e0SNeilBrown struct nfs_commit_data *p; 7640859d7eSChuck Lever 77515dcdcdSTrond Myklebust p = kmem_cache_zalloc(nfs_cdata_cachep, nfs_io_gfp_mask()); 78515dcdcdSTrond Myklebust if (!p) { 79518662e0SNeilBrown p = mempool_alloc(nfs_commit_mempool, GFP_NOWAIT); 80518662e0SNeilBrown if (!p) 81518662e0SNeilBrown return NULL; 821da177e4SLinus Torvalds memset(p, 0, sizeof(*p)); 83515dcdcdSTrond Myklebust } 841da177e4SLinus Torvalds INIT_LIST_HEAD(&p->pages); 851da177e4SLinus Torvalds return p; 861da177e4SLinus Torvalds } 87e0c2b380SFred Isaman EXPORT_SYMBOL_GPL(nfs_commitdata_alloc); 881da177e4SLinus Torvalds 890b7c0153SFred Isaman void nfs_commit_free(struct nfs_commit_data *p) 901da177e4SLinus Torvalds { 911da177e4SLinus Torvalds mempool_free(p, nfs_commit_mempool); 921da177e4SLinus Torvalds } 93e0c2b380SFred Isaman EXPORT_SYMBOL_GPL(nfs_commit_free); 941da177e4SLinus Torvalds 951e7f3a48SWeston Andros Adamson static struct nfs_pgio_header *nfs_writehdr_alloc(void) 963feb2d49STrond Myklebust { 970bae835bSTrond Myklebust struct nfs_pgio_header *p; 983feb2d49STrond Myklebust 990bae835bSTrond Myklebust p = kmem_cache_zalloc(nfs_wdata_cachep, nfs_io_gfp_mask()); 1000bae835bSTrond Myklebust if (!p) { 1010bae835bSTrond Myklebust p = mempool_alloc(nfs_wdata_mempool, GFP_NOWAIT); 1020bae835bSTrond Myklebust if (!p) 1030bae835bSTrond Myklebust return NULL; 1043feb2d49STrond Myklebust memset(p, 0, sizeof(*p)); 1050bae835bSTrond Myklebust } 106fbe77c30SBenjamin Coddington p->rw_mode = FMODE_WRITE; 1073feb2d49STrond Myklebust return p; 1083feb2d49STrond Myklebust } 1093feb2d49STrond Myklebust 1101e7f3a48SWeston Andros Adamson static void nfs_writehdr_free(struct nfs_pgio_header *hdr) 1116c75dc0dSFred Isaman { 1121e7f3a48SWeston Andros Adamson mempool_free(hdr, nfs_wdata_mempool); 1133feb2d49STrond Myklebust } 1141da177e4SLinus Torvalds 115919e3bd9STrond Myklebust static struct nfs_io_completion *nfs_io_completion_alloc(gfp_t gfp_flags) 116919e3bd9STrond Myklebust { 117919e3bd9STrond Myklebust return kmalloc(sizeof(struct nfs_io_completion), gfp_flags); 118919e3bd9STrond Myklebust } 119919e3bd9STrond Myklebust 120919e3bd9STrond Myklebust static void nfs_io_completion_init(struct nfs_io_completion *ioc, 121919e3bd9STrond Myklebust void (*complete)(void *), void *data) 122919e3bd9STrond Myklebust { 123919e3bd9STrond Myklebust ioc->complete = complete; 124919e3bd9STrond Myklebust ioc->data = data; 125919e3bd9STrond Myklebust kref_init(&ioc->refcount); 126919e3bd9STrond Myklebust } 127919e3bd9STrond Myklebust 128919e3bd9STrond Myklebust static void nfs_io_completion_release(struct kref *kref) 129919e3bd9STrond Myklebust { 130919e3bd9STrond Myklebust struct nfs_io_completion *ioc = container_of(kref, 131919e3bd9STrond Myklebust struct nfs_io_completion, refcount); 132919e3bd9STrond Myklebust ioc->complete(ioc->data); 133919e3bd9STrond Myklebust kfree(ioc); 134919e3bd9STrond Myklebust } 135919e3bd9STrond Myklebust 136919e3bd9STrond Myklebust static void nfs_io_completion_get(struct nfs_io_completion *ioc) 137919e3bd9STrond Myklebust { 138919e3bd9STrond Myklebust if (ioc != NULL) 139919e3bd9STrond Myklebust kref_get(&ioc->refcount); 140919e3bd9STrond Myklebust } 141919e3bd9STrond Myklebust 142919e3bd9STrond Myklebust static void nfs_io_completion_put(struct nfs_io_completion *ioc) 143919e3bd9STrond Myklebust { 144919e3bd9STrond Myklebust if (ioc != NULL) 145919e3bd9STrond Myklebust kref_put(&ioc->refcount, nfs_io_completion_release); 146919e3bd9STrond Myklebust } 147919e3bd9STrond Myklebust 148e00ed89dSTrond Myklebust static void 149e00ed89dSTrond Myklebust nfs_page_set_inode_ref(struct nfs_page *req, struct inode *inode) 150e00ed89dSTrond Myklebust { 151e00ed89dSTrond Myklebust if (!test_and_set_bit(PG_INODE_REF, &req->wb_flags)) { 152e00ed89dSTrond Myklebust kref_get(&req->wb_kref); 153e00ed89dSTrond Myklebust atomic_long_inc(&NFS_I(inode)->nrequests); 154e00ed89dSTrond Myklebust } 155e00ed89dSTrond Myklebust } 156e00ed89dSTrond Myklebust 157e00ed89dSTrond Myklebust static int 158e00ed89dSTrond Myklebust nfs_cancel_remove_inode(struct nfs_page *req, struct inode *inode) 159e00ed89dSTrond Myklebust { 160e00ed89dSTrond Myklebust int ret; 161e00ed89dSTrond Myklebust 162e00ed89dSTrond Myklebust if (!test_bit(PG_REMOVE, &req->wb_flags)) 163e00ed89dSTrond Myklebust return 0; 164e00ed89dSTrond Myklebust ret = nfs_page_group_lock(req); 165e00ed89dSTrond Myklebust if (ret) 166e00ed89dSTrond Myklebust return ret; 167e00ed89dSTrond Myklebust if (test_and_clear_bit(PG_REMOVE, &req->wb_flags)) 168e00ed89dSTrond Myklebust nfs_page_set_inode_ref(req, inode); 169e00ed89dSTrond Myklebust nfs_page_group_unlock(req); 170e00ed89dSTrond Myklebust return 0; 171e00ed89dSTrond Myklebust } 172e00ed89dSTrond Myklebust 173bd37d6fcSTrond Myklebust static struct nfs_page * 174bd37d6fcSTrond Myklebust nfs_page_private_request(struct page *page) 175bd37d6fcSTrond Myklebust { 176bd37d6fcSTrond Myklebust if (!PagePrivate(page)) 177bd37d6fcSTrond Myklebust return NULL; 178bd37d6fcSTrond Myklebust return (struct nfs_page *)page_private(page); 179bd37d6fcSTrond Myklebust } 180bd37d6fcSTrond Myklebust 18184d3a9a9SWeston Andros Adamson /* 18284d3a9a9SWeston Andros Adamson * nfs_page_find_head_request_locked - find head request associated with @page 18384d3a9a9SWeston Andros Adamson * 18484d3a9a9SWeston Andros Adamson * must be called while holding the inode lock. 18584d3a9a9SWeston Andros Adamson * 18684d3a9a9SWeston Andros Adamson * returns matching head request with reference held, or NULL if not found. 18784d3a9a9SWeston Andros Adamson */ 18829418aa4SMel Gorman static struct nfs_page * 189b30d2f04STrond Myklebust nfs_page_find_private_request(struct page *page) 190277459d2STrond Myklebust { 1914b9bb25bSTrond Myklebust struct address_space *mapping = page_file_mapping(page); 192bd37d6fcSTrond Myklebust struct nfs_page *req; 193277459d2STrond Myklebust 194b30d2f04STrond Myklebust if (!PagePrivate(page)) 195b30d2f04STrond Myklebust return NULL; 1964b9bb25bSTrond Myklebust spin_lock(&mapping->private_lock); 197bd37d6fcSTrond Myklebust req = nfs_page_private_request(page); 19884d3a9a9SWeston Andros Adamson if (req) { 19984d3a9a9SWeston Andros Adamson WARN_ON_ONCE(req->wb_head != req); 20029418aa4SMel Gorman kref_get(&req->wb_kref); 20184d3a9a9SWeston Andros Adamson } 2024b9bb25bSTrond Myklebust spin_unlock(&mapping->private_lock); 203b30d2f04STrond Myklebust return req; 204b30d2f04STrond Myklebust } 20529418aa4SMel Gorman 206b30d2f04STrond Myklebust static struct nfs_page * 207b30d2f04STrond Myklebust nfs_page_find_swap_request(struct page *page) 208b30d2f04STrond Myklebust { 209b30d2f04STrond Myklebust struct inode *inode = page_file_mapping(page)->host; 210b30d2f04STrond Myklebust struct nfs_inode *nfsi = NFS_I(inode); 211b30d2f04STrond Myklebust struct nfs_page *req = NULL; 212b30d2f04STrond Myklebust if (!PageSwapCache(page)) 213b30d2f04STrond Myklebust return NULL; 214e824f99aSTrond Myklebust mutex_lock(&nfsi->commit_mutex); 215b30d2f04STrond Myklebust if (PageSwapCache(page)) { 216b30d2f04STrond Myklebust req = nfs_page_search_commits_for_head_request_locked(nfsi, 217b30d2f04STrond Myklebust page); 218b30d2f04STrond Myklebust if (req) { 219b30d2f04STrond Myklebust WARN_ON_ONCE(req->wb_head != req); 220b30d2f04STrond Myklebust kref_get(&req->wb_kref); 221b30d2f04STrond Myklebust } 222b30d2f04STrond Myklebust } 223e824f99aSTrond Myklebust mutex_unlock(&nfsi->commit_mutex); 224277459d2STrond Myklebust return req; 225277459d2STrond Myklebust } 226277459d2STrond Myklebust 22784d3a9a9SWeston Andros Adamson /* 22884d3a9a9SWeston Andros Adamson * nfs_page_find_head_request - find head request associated with @page 22984d3a9a9SWeston Andros Adamson * 23084d3a9a9SWeston Andros Adamson * returns matching head request with reference held, or NULL if not found. 23184d3a9a9SWeston Andros Adamson */ 23284d3a9a9SWeston Andros Adamson static struct nfs_page *nfs_page_find_head_request(struct page *page) 233277459d2STrond Myklebust { 234b30d2f04STrond Myklebust struct nfs_page *req; 235277459d2STrond Myklebust 236b30d2f04STrond Myklebust req = nfs_page_find_private_request(page); 237b30d2f04STrond Myklebust if (!req) 238b30d2f04STrond Myklebust req = nfs_page_find_swap_request(page); 239277459d2STrond Myklebust return req; 240277459d2STrond Myklebust } 241277459d2STrond Myklebust 242e00ed89dSTrond Myklebust static struct nfs_page *nfs_find_and_lock_page_request(struct page *page) 243e00ed89dSTrond Myklebust { 244e00ed89dSTrond Myklebust struct inode *inode = page_file_mapping(page)->host; 245e00ed89dSTrond Myklebust struct nfs_page *req, *head; 246e00ed89dSTrond Myklebust int ret; 247e00ed89dSTrond Myklebust 248e00ed89dSTrond Myklebust for (;;) { 249e00ed89dSTrond Myklebust req = nfs_page_find_head_request(page); 250e00ed89dSTrond Myklebust if (!req) 251e00ed89dSTrond Myklebust return req; 252e00ed89dSTrond Myklebust head = nfs_page_group_lock_head(req); 253e00ed89dSTrond Myklebust if (head != req) 254e00ed89dSTrond Myklebust nfs_release_request(req); 255e00ed89dSTrond Myklebust if (IS_ERR(head)) 256e00ed89dSTrond Myklebust return head; 257e00ed89dSTrond Myklebust ret = nfs_cancel_remove_inode(head, inode); 258e00ed89dSTrond Myklebust if (ret < 0) { 259e00ed89dSTrond Myklebust nfs_unlock_and_release_request(head); 260e00ed89dSTrond Myklebust return ERR_PTR(ret); 261e00ed89dSTrond Myklebust } 262e00ed89dSTrond Myklebust /* Ensure that nobody removed the request before we locked it */ 263e00ed89dSTrond Myklebust if (head == nfs_page_private_request(page)) 264e00ed89dSTrond Myklebust break; 265e00ed89dSTrond Myklebust if (PageSwapCache(page)) 266e00ed89dSTrond Myklebust break; 267e00ed89dSTrond Myklebust nfs_unlock_and_release_request(head); 268e00ed89dSTrond Myklebust } 269e00ed89dSTrond Myklebust return head; 270e00ed89dSTrond Myklebust } 271e00ed89dSTrond Myklebust 2721da177e4SLinus Torvalds /* Adjust the file length if we're writing beyond the end */ 2731da177e4SLinus Torvalds static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int count) 2741da177e4SLinus Torvalds { 275d56b4ddfSMel Gorman struct inode *inode = page_file_mapping(page)->host; 276a3d01454STrond Myklebust loff_t end, i_size; 277a3d01454STrond Myklebust pgoff_t end_index; 2781da177e4SLinus Torvalds 279a3d01454STrond Myklebust spin_lock(&inode->i_lock); 280a3d01454STrond Myklebust i_size = i_size_read(inode); 28109cbfeafSKirill A. Shutemov end_index = (i_size - 1) >> PAGE_SHIFT; 2828cd79788SHuang Ying if (i_size > 0 && page_index(page) < end_index) 283a3d01454STrond Myklebust goto out; 284d56b4ddfSMel Gorman end = page_file_offset(page) + ((loff_t)offset+count); 2851da177e4SLinus Torvalds if (i_size >= end) 286a3d01454STrond Myklebust goto out; 287110cb2d2SChuck Lever trace_nfs_size_grow(inode, end); 2881da177e4SLinus Torvalds i_size_write(inode, end); 289f6cdfa6dSTrond Myklebust NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_SIZE; 290a3d01454STrond Myklebust nfs_inc_stats(inode, NFSIOS_EXTENDWRITE); 291a3d01454STrond Myklebust out: 292a3d01454STrond Myklebust spin_unlock(&inode->i_lock); 293a6b5a28eSDave Wysochanski nfs_fscache_invalidate(inode, 0); 2941da177e4SLinus Torvalds } 2951da177e4SLinus Torvalds 296a301b777STrond Myklebust /* A writeback failed: mark the page as bad, and invalidate the page cache */ 297d2ceb7e5SBenjamin Coddington static void nfs_set_pageerror(struct address_space *mapping) 298a301b777STrond Myklebust { 2990df68cedSTrond Myklebust struct inode *inode = mapping->host; 3000df68cedSTrond Myklebust 301d2ceb7e5SBenjamin Coddington nfs_zap_mapping(mapping->host, mapping); 3020df68cedSTrond Myklebust /* Force file size revalidation */ 3030df68cedSTrond Myklebust spin_lock(&inode->i_lock); 304ac46b3d7STrond Myklebust nfs_set_cache_invalid(inode, NFS_INO_REVAL_FORCED | 30588a6099fSTrond Myklebust NFS_INO_INVALID_CHANGE | 306ac46b3d7STrond Myklebust NFS_INO_INVALID_SIZE); 3070df68cedSTrond Myklebust spin_unlock(&inode->i_lock); 308a301b777STrond Myklebust } 309a301b777STrond Myklebust 3106fbda89bSTrond Myklebust static void nfs_mapping_set_error(struct page *page, int error) 3116fbda89bSTrond Myklebust { 312b8946d7bSTrond Myklebust struct address_space *mapping = page_file_mapping(page); 313b8946d7bSTrond Myklebust 3146fbda89bSTrond Myklebust SetPageError(page); 3156c984083STrond Myklebust filemap_set_wb_err(mapping, error); 3166c984083STrond Myklebust if (mapping->host) 3176c984083STrond Myklebust errseq_set(&mapping->host->i_sb->s_wb_err, 3186c984083STrond Myklebust error == -ENOSPC ? -ENOSPC : -EIO); 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) 4196df25e58SNeilBrown nfss->write_congested = 1; 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) 4356df25e58SNeilBrown nfss->write_congested = 0; 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 { 595af887e43STrond Myklebust trace_nfs_write_error(page_file_mapping(req->wb_page)->host, req, 596af887e43STrond Myklebust error); 5976fbda89bSTrond Myklebust nfs_mapping_set_error(req->wb_page, error); 59806c9fdf3STrond Myklebust nfs_inode_remove_request(req); 5990bcbf039SPeng Tao nfs_end_page_writeback(req); 6001f84ccdfSFred Isaman nfs_release_request(req); 6010bcbf039SPeng Tao } 6020bcbf039SPeng Tao 603074cc1deSTrond Myklebust /* 604074cc1deSTrond Myklebust * Find an associated nfs write request, and prepare to flush it out 605074cc1deSTrond Myklebust * May return an error if the user signalled nfs_wait_on_request(). 606074cc1deSTrond Myklebust */ 607c6fd3511STrond Myklebust static int nfs_page_async_flush(struct page *page, 608c6fd3511STrond Myklebust struct writeback_control *wbc, 609c6fd3511STrond Myklebust struct nfs_pageio_descriptor *pgio) 610074cc1deSTrond Myklebust { 611074cc1deSTrond Myklebust struct nfs_page *req; 612074cc1deSTrond Myklebust int ret = 0; 613074cc1deSTrond Myklebust 6146d17d653STrond Myklebust req = nfs_lock_and_join_requests(page); 615074cc1deSTrond Myklebust if (!req) 616074cc1deSTrond Myklebust goto out; 617074cc1deSTrond Myklebust ret = PTR_ERR(req); 618074cc1deSTrond Myklebust if (IS_ERR(req)) 619074cc1deSTrond Myklebust goto out; 620074cc1deSTrond Myklebust 621deed85e7STrond Myklebust nfs_set_page_writeback(page); 622deed85e7STrond Myklebust WARN_ON_ONCE(test_bit(PG_CLEAN, &req->wb_flags)); 623074cc1deSTrond Myklebust 624a6598813STrond Myklebust /* If there is a fatal error that covers this write, just exit */ 62596c41455STrond Myklebust ret = pgio->pg_error; 62696c41455STrond Myklebust if (nfs_error_is_fatal_on_server(ret)) 627a6598813STrond Myklebust goto out_launder; 628a6598813STrond Myklebust 62996c41455STrond Myklebust ret = 0; 630f8512ad0SFred Isaman if (!nfs_pageio_add_request(pgio, req)) { 631074cc1deSTrond Myklebust ret = pgio->pg_error; 6320bcbf039SPeng Tao /* 633c373fff7STrond Myklebust * Remove the problematic req upon fatal errors on the server 6340bcbf039SPeng Tao */ 635c373fff7STrond Myklebust if (nfs_error_is_fatal_on_server(ret)) 636a6598813STrond Myklebust goto out_launder; 637c6fd3511STrond Myklebust if (wbc->sync_mode == WB_SYNC_NONE) 638c6fd3511STrond Myklebust ret = AOP_WRITEPAGE_ACTIVATE; 639c6fd3511STrond Myklebust redirty_page_for_writepage(wbc, page); 6408fc75bedSTrond Myklebust nfs_redirty_request(req); 64196c41455STrond Myklebust pgio->pg_error = 0; 64240f90271STrond Myklebust } else 64340f90271STrond Myklebust nfs_add_stats(page_file_mapping(page)->host, 64440f90271STrond Myklebust NFSIOS_WRITEPAGES, 1); 645074cc1deSTrond Myklebust out: 646074cc1deSTrond Myklebust return ret; 647a6598813STrond Myklebust out_launder: 6486fbda89bSTrond Myklebust nfs_write_error(req, ret); 64914bebe3cSTrond Myklebust return 0; 650e261f51fSTrond Myklebust } 651e261f51fSTrond Myklebust 652d6c843b9SPeng Tao static int nfs_do_writepage(struct page *page, struct writeback_control *wbc, 653c373fff7STrond Myklebust struct nfs_pageio_descriptor *pgio) 654f758c885STrond Myklebust { 6558cd79788SHuang Ying nfs_pageio_cond_complete(pgio, page_index(page)); 656c6fd3511STrond Myklebust return nfs_page_async_flush(page, wbc, pgio); 657f758c885STrond Myklebust } 658f758c885STrond Myklebust 659e261f51fSTrond Myklebust /* 6601da177e4SLinus Torvalds * Write an mmapped page to the server. 6611da177e4SLinus Torvalds */ 662d6c843b9SPeng Tao static int nfs_writepage_locked(struct page *page, 663c373fff7STrond Myklebust struct writeback_control *wbc) 6641da177e4SLinus Torvalds { 665f758c885STrond Myklebust struct nfs_pageio_descriptor pgio; 66640f90271STrond Myklebust struct inode *inode = page_file_mapping(page)->host; 667e261f51fSTrond Myklebust int err; 6681da177e4SLinus Torvalds 6696df25e58SNeilBrown if (wbc->sync_mode == WB_SYNC_NONE && 6706df25e58SNeilBrown NFS_SERVER(inode)->write_congested) 6716df25e58SNeilBrown return AOP_WRITEPAGE_ACTIVATE; 6726df25e58SNeilBrown 67340f90271STrond Myklebust nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE); 674811ed92eSTrond Myklebust nfs_pageio_init_write(&pgio, inode, 0, 675a20c93e3SChristoph Hellwig false, &nfs_async_write_completion_ops); 676c373fff7STrond Myklebust err = nfs_do_writepage(page, wbc, &pgio); 67796c41455STrond Myklebust pgio.pg_error = 0; 678f758c885STrond Myklebust nfs_pageio_complete(&pgio); 6794d770ccfSTrond Myklebust return err; 6804d770ccfSTrond Myklebust } 6814d770ccfSTrond Myklebust 6824d770ccfSTrond Myklebust int nfs_writepage(struct page *page, struct writeback_control *wbc) 6834d770ccfSTrond Myklebust { 684f758c885STrond Myklebust int ret; 6854d770ccfSTrond Myklebust 686c373fff7STrond Myklebust ret = nfs_writepage_locked(page, wbc); 68796c41455STrond Myklebust if (ret != AOP_WRITEPAGE_ACTIVATE) 6881da177e4SLinus Torvalds unlock_page(page); 689f758c885STrond Myklebust return ret; 690f758c885STrond Myklebust } 691f758c885STrond Myklebust 692f758c885STrond Myklebust static int nfs_writepages_callback(struct page *page, struct writeback_control *wbc, void *data) 693f758c885STrond Myklebust { 694f758c885STrond Myklebust int ret; 695f758c885STrond Myklebust 696c373fff7STrond Myklebust ret = nfs_do_writepage(page, wbc, data); 69796c41455STrond Myklebust if (ret != AOP_WRITEPAGE_ACTIVATE) 698f758c885STrond Myklebust unlock_page(page); 699f758c885STrond Myklebust return ret; 7001da177e4SLinus Torvalds } 7011da177e4SLinus Torvalds 702919e3bd9STrond Myklebust static void nfs_io_completion_commit(void *inode) 703919e3bd9STrond Myklebust { 704919e3bd9STrond Myklebust nfs_commit_inode(inode, 0); 705919e3bd9STrond Myklebust } 706919e3bd9STrond Myklebust 7071da177e4SLinus Torvalds int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc) 7081da177e4SLinus Torvalds { 7091da177e4SLinus Torvalds struct inode *inode = mapping->host; 710c63c7b05STrond Myklebust struct nfs_pageio_descriptor pgio; 711ed7bcdb3STrond Myklebust struct nfs_io_completion *ioc = NULL; 712ed7bcdb3STrond Myklebust unsigned int mntflags = NFS_SERVER(inode)->flags; 713ed7bcdb3STrond Myklebust int priority = 0; 7141da177e4SLinus Torvalds int err; 7151da177e4SLinus Torvalds 7166df25e58SNeilBrown if (wbc->sync_mode == WB_SYNC_NONE && 7176df25e58SNeilBrown NFS_SERVER(inode)->write_congested) 7186df25e58SNeilBrown return 0; 7196df25e58SNeilBrown 72091d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES); 72191d5b470SChuck Lever 722ed7bcdb3STrond Myklebust if (!(mntflags & NFS_MOUNT_WRITE_EAGER) || wbc->for_kupdate || 723ed7bcdb3STrond Myklebust wbc->for_background || wbc->for_sync || wbc->for_reclaim) { 7242b17d725STrond Myklebust ioc = nfs_io_completion_alloc(GFP_KERNEL); 725919e3bd9STrond Myklebust if (ioc) 726ed7bcdb3STrond Myklebust nfs_io_completion_init(ioc, nfs_io_completion_commit, 727ed7bcdb3STrond Myklebust inode); 728ed7bcdb3STrond Myklebust priority = wb_priority(wbc); 729ed7bcdb3STrond Myklebust } 730919e3bd9STrond Myklebust 731c6fd3511STrond Myklebust do { 732ed7bcdb3STrond Myklebust nfs_pageio_init_write(&pgio, inode, priority, false, 733a20c93e3SChristoph Hellwig &nfs_async_write_completion_ops); 734919e3bd9STrond Myklebust pgio.pg_io_completion = ioc; 735c6fd3511STrond Myklebust err = write_cache_pages(mapping, wbc, nfs_writepages_callback, 736c6fd3511STrond Myklebust &pgio); 73796c41455STrond Myklebust pgio.pg_error = 0; 738c63c7b05STrond Myklebust nfs_pageio_complete(&pgio); 739c6fd3511STrond Myklebust } while (err < 0 && !nfs_error_is_fatal(err)); 740919e3bd9STrond Myklebust nfs_io_completion_put(ioc); 74172cb77f4STrond Myklebust 742f758c885STrond Myklebust if (err < 0) 74372cb77f4STrond Myklebust goto out_err; 744c63c7b05STrond Myklebust return 0; 74572cb77f4STrond Myklebust out_err: 74672cb77f4STrond Myklebust return err; 7471da177e4SLinus Torvalds } 7481da177e4SLinus Torvalds 7491da177e4SLinus Torvalds /* 7501da177e4SLinus Torvalds * Insert a write request into an inode 7511da177e4SLinus Torvalds */ 752d6d6dc7cSFred Isaman static void nfs_inode_add_request(struct inode *inode, struct nfs_page *req) 7531da177e4SLinus Torvalds { 7544b9bb25bSTrond Myklebust struct address_space *mapping = page_file_mapping(req->wb_page); 7551da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 756e7d39069STrond Myklebust 7572bfc6e56SWeston Andros Adamson WARN_ON_ONCE(req->wb_this_page != req); 7582bfc6e56SWeston Andros Adamson 759e7d39069STrond Myklebust /* Lock the request! */ 7607ad84aa9STrond Myklebust nfs_lock_request(req); 761e7d39069STrond Myklebust 76229418aa4SMel Gorman /* 76329418aa4SMel Gorman * Swap-space should not get truncated. Hence no need to plug the race 76429418aa4SMel Gorman * with invalidate/truncate. 76529418aa4SMel Gorman */ 7664b9bb25bSTrond Myklebust spin_lock(&mapping->private_lock); 76729418aa4SMel Gorman if (likely(!PageSwapCache(req->wb_page))) { 7682df485a7STrond Myklebust set_bit(PG_MAPPED, &req->wb_flags); 769deb7d638STrond Myklebust SetPagePrivate(req->wb_page); 770277459d2STrond Myklebust set_page_private(req->wb_page, (unsigned long)req); 77129418aa4SMel Gorman } 7724b9bb25bSTrond Myklebust spin_unlock(&mapping->private_lock); 773a6b6d5b8STrond Myklebust atomic_long_inc(&nfsi->nrequests); 77417089a29SWeston Andros Adamson /* this a head request for a page group - mark it as having an 775cb1410c7SWeston Andros Adamson * extra reference so sub groups can follow suit. 776cb1410c7SWeston Andros Adamson * This flag also informs pgio layer when to bump nrequests when 777cb1410c7SWeston Andros Adamson * adding subrequests. */ 77817089a29SWeston Andros Adamson WARN_ON(test_and_set_bit(PG_INODE_REF, &req->wb_flags)); 779c03b4024STrond Myklebust kref_get(&req->wb_kref); 7801da177e4SLinus Torvalds } 7811da177e4SLinus Torvalds 7821da177e4SLinus Torvalds /* 78389a09141SPeter Zijlstra * Remove a write request from an inode 7841da177e4SLinus Torvalds */ 7851da177e4SLinus Torvalds static void nfs_inode_remove_request(struct nfs_page *req) 7861da177e4SLinus Torvalds { 7874b9bb25bSTrond Myklebust struct address_space *mapping = page_file_mapping(req->wb_page); 7884b9bb25bSTrond Myklebust struct inode *inode = mapping->host; 7891da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 79020633f04SWeston Andros Adamson struct nfs_page *head; 79120633f04SWeston Andros Adamson 79220633f04SWeston Andros Adamson if (nfs_page_group_sync_on_bit(req, PG_REMOVE)) { 79320633f04SWeston Andros Adamson head = req->wb_head; 7941da177e4SLinus Torvalds 7954b9bb25bSTrond Myklebust spin_lock(&mapping->private_lock); 79667911c8fSAnna Schumaker if (likely(head->wb_page && !PageSwapCache(head->wb_page))) { 79720633f04SWeston Andros Adamson set_page_private(head->wb_page, 0); 79820633f04SWeston Andros Adamson ClearPagePrivate(head->wb_page); 79920633f04SWeston Andros Adamson clear_bit(PG_MAPPED, &head->wb_flags); 80029418aa4SMel Gorman } 8014b9bb25bSTrond Myklebust spin_unlock(&mapping->private_lock); 80220633f04SWeston Andros Adamson } 80317089a29SWeston Andros Adamson 80433ea5aaaSZhangXiaoxu if (test_and_clear_bit(PG_INODE_REF, &req->wb_flags)) { 8051da177e4SLinus Torvalds nfs_release_request(req); 80633ea5aaaSZhangXiaoxu atomic_long_dec(&nfsi->nrequests); 80733ea5aaaSZhangXiaoxu } 8081da177e4SLinus Torvalds } 8091da177e4SLinus Torvalds 81061822ab5STrond Myklebust static void 8116d884e8fSFred nfs_mark_request_dirty(struct nfs_page *req) 81261822ab5STrond Myklebust { 81367911c8fSAnna Schumaker if (req->wb_page) 81461822ab5STrond Myklebust __set_page_dirty_nobuffers(req->wb_page); 81561822ab5STrond Myklebust } 81661822ab5STrond Myklebust 8173a3908c8STrond Myklebust /* 8183a3908c8STrond Myklebust * nfs_page_search_commits_for_head_request_locked 8193a3908c8STrond Myklebust * 8203a3908c8STrond Myklebust * Search through commit lists on @inode for the head request for @page. 8213a3908c8STrond Myklebust * Must be called while holding the inode (which is cinfo) lock. 8223a3908c8STrond Myklebust * 8233a3908c8STrond Myklebust * Returns the head request if found, or NULL if not found. 8243a3908c8STrond Myklebust */ 8253a3908c8STrond Myklebust static struct nfs_page * 8263a3908c8STrond Myklebust nfs_page_search_commits_for_head_request_locked(struct nfs_inode *nfsi, 8273a3908c8STrond Myklebust struct page *page) 8283a3908c8STrond Myklebust { 8293a3908c8STrond Myklebust struct nfs_page *freq, *t; 8303a3908c8STrond Myklebust struct nfs_commit_info cinfo; 8313a3908c8STrond Myklebust struct inode *inode = &nfsi->vfs_inode; 8323a3908c8STrond Myklebust 8333a3908c8STrond Myklebust nfs_init_cinfo_from_inode(&cinfo, inode); 8343a3908c8STrond Myklebust 8353a3908c8STrond Myklebust /* search through pnfs commit lists */ 8363a3908c8STrond Myklebust freq = pnfs_search_commit_reqs(inode, &cinfo, page); 8373a3908c8STrond Myklebust if (freq) 8383a3908c8STrond Myklebust return freq->wb_head; 8393a3908c8STrond Myklebust 8403a3908c8STrond Myklebust /* Linearly search the commit list for the correct request */ 8413a3908c8STrond Myklebust list_for_each_entry_safe(freq, t, &cinfo.mds->list, wb_list) { 8423a3908c8STrond Myklebust if (freq->wb_page == page) 8433a3908c8STrond Myklebust return freq->wb_head; 8443a3908c8STrond Myklebust } 8453a3908c8STrond Myklebust 8463a3908c8STrond Myklebust return NULL; 8473a3908c8STrond Myklebust } 8483a3908c8STrond Myklebust 8498dd37758STrond Myklebust /** 85086d80f97STrond Myklebust * nfs_request_add_commit_list_locked - add request to a commit list 85186d80f97STrond Myklebust * @req: pointer to a struct nfs_page 85286d80f97STrond Myklebust * @dst: commit list head 85386d80f97STrond Myklebust * @cinfo: holds list lock and accounting info 85486d80f97STrond Myklebust * 85586d80f97STrond Myklebust * This sets the PG_CLEAN bit, updates the cinfo count of 85686d80f97STrond Myklebust * number of outstanding requests requiring a commit as well as 85786d80f97STrond Myklebust * the MM page stats. 85886d80f97STrond Myklebust * 859e824f99aSTrond Myklebust * The caller must hold NFS_I(cinfo->inode)->commit_mutex, and the 860e824f99aSTrond Myklebust * nfs_page lock. 86186d80f97STrond Myklebust */ 86286d80f97STrond Myklebust void 86386d80f97STrond Myklebust nfs_request_add_commit_list_locked(struct nfs_page *req, struct list_head *dst, 86486d80f97STrond Myklebust struct nfs_commit_info *cinfo) 86586d80f97STrond Myklebust { 86686d80f97STrond Myklebust set_bit(PG_CLEAN, &req->wb_flags); 86786d80f97STrond Myklebust nfs_list_add_request(req, dst); 8685cb953d4STrond Myklebust atomic_long_inc(&cinfo->mds->ncommit); 86986d80f97STrond Myklebust } 87086d80f97STrond Myklebust EXPORT_SYMBOL_GPL(nfs_request_add_commit_list_locked); 87186d80f97STrond Myklebust 87286d80f97STrond Myklebust /** 8738dd37758STrond Myklebust * nfs_request_add_commit_list - add request to a commit list 8748dd37758STrond Myklebust * @req: pointer to a struct nfs_page 875ea2cf228SFred Isaman * @cinfo: holds list lock and accounting info 8768dd37758STrond Myklebust * 877ea2cf228SFred Isaman * This sets the PG_CLEAN bit, updates the cinfo count of 8788dd37758STrond Myklebust * number of outstanding requests requiring a commit as well as 8798dd37758STrond Myklebust * the MM page stats. 8808dd37758STrond Myklebust * 881ea2cf228SFred Isaman * The caller must _not_ hold the cinfo->lock, but must be 8828dd37758STrond Myklebust * holding the nfs_page lock. 8838dd37758STrond Myklebust */ 8848dd37758STrond Myklebust void 8856272dcc6SAnna Schumaker nfs_request_add_commit_list(struct nfs_page *req, struct nfs_commit_info *cinfo) 8868dd37758STrond Myklebust { 887e824f99aSTrond Myklebust mutex_lock(&NFS_I(cinfo->inode)->commit_mutex); 8886272dcc6SAnna Schumaker nfs_request_add_commit_list_locked(req, &cinfo->mds->list, cinfo); 889e824f99aSTrond Myklebust mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex); 89067911c8fSAnna Schumaker if (req->wb_page) 89186d80f97STrond Myklebust nfs_mark_page_unstable(req->wb_page, cinfo); 8928dd37758STrond Myklebust } 8938dd37758STrond Myklebust EXPORT_SYMBOL_GPL(nfs_request_add_commit_list); 8948dd37758STrond Myklebust 8958dd37758STrond Myklebust /** 8968dd37758STrond Myklebust * nfs_request_remove_commit_list - Remove request from a commit list 8978dd37758STrond Myklebust * @req: pointer to a nfs_page 898ea2cf228SFred Isaman * @cinfo: holds list lock and accounting info 8998dd37758STrond Myklebust * 900ea2cf228SFred Isaman * This clears the PG_CLEAN bit, and updates the cinfo's count of 9018dd37758STrond Myklebust * number of outstanding requests requiring a commit 9028dd37758STrond Myklebust * It does not update the MM page stats. 9038dd37758STrond Myklebust * 904ea2cf228SFred Isaman * The caller _must_ hold the cinfo->lock and the nfs_page lock. 9058dd37758STrond Myklebust */ 9068dd37758STrond Myklebust void 907ea2cf228SFred Isaman nfs_request_remove_commit_list(struct nfs_page *req, 908ea2cf228SFred Isaman struct nfs_commit_info *cinfo) 9098dd37758STrond Myklebust { 9108dd37758STrond Myklebust if (!test_and_clear_bit(PG_CLEAN, &(req)->wb_flags)) 9118dd37758STrond Myklebust return; 9128dd37758STrond Myklebust nfs_list_remove_request(req); 9135cb953d4STrond Myklebust atomic_long_dec(&cinfo->mds->ncommit); 9148dd37758STrond Myklebust } 9158dd37758STrond Myklebust EXPORT_SYMBOL_GPL(nfs_request_remove_commit_list); 9168dd37758STrond Myklebust 917ea2cf228SFred Isaman static void nfs_init_cinfo_from_inode(struct nfs_commit_info *cinfo, 918ea2cf228SFred Isaman struct inode *inode) 919ea2cf228SFred Isaman { 920fe238e60SDave Wysochanski cinfo->inode = inode; 921ea2cf228SFred Isaman cinfo->mds = &NFS_I(inode)->commit_info; 922ea2cf228SFred Isaman cinfo->ds = pnfs_get_ds_info(inode); 923b359f9d0SFred Isaman cinfo->dreq = NULL; 924f453a54aSFred Isaman cinfo->completion_ops = &nfs_commit_completion_ops; 925ea2cf228SFred Isaman } 926ea2cf228SFred Isaman 927ea2cf228SFred Isaman void nfs_init_cinfo(struct nfs_commit_info *cinfo, 928ea2cf228SFred Isaman struct inode *inode, 929ea2cf228SFred Isaman struct nfs_direct_req *dreq) 930ea2cf228SFred Isaman { 9311763da12SFred Isaman if (dreq) 9321763da12SFred Isaman nfs_init_cinfo_from_dreq(cinfo, dreq); 9331763da12SFred Isaman else 934ea2cf228SFred Isaman nfs_init_cinfo_from_inode(cinfo, inode); 935ea2cf228SFred Isaman } 936ea2cf228SFred Isaman EXPORT_SYMBOL_GPL(nfs_init_cinfo); 9378dd37758STrond Myklebust 9381da177e4SLinus Torvalds /* 9391da177e4SLinus Torvalds * Add a request to the inode's commit list. 9401da177e4SLinus Torvalds */ 9411763da12SFred Isaman void 942ea2cf228SFred Isaman nfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg, 943b57ff130SWeston Andros Adamson struct nfs_commit_info *cinfo, u32 ds_commit_idx) 9441da177e4SLinus Torvalds { 945b57ff130SWeston Andros Adamson if (pnfs_mark_request_commit(req, lseg, cinfo, ds_commit_idx)) 9468dd37758STrond Myklebust return; 9476272dcc6SAnna Schumaker nfs_request_add_commit_list(req, cinfo); 9481da177e4SLinus Torvalds } 9498e821cadSTrond Myklebust 950d6d6dc7cSFred Isaman static void 951d6d6dc7cSFred Isaman nfs_clear_page_commit(struct page *page) 952e468bae9STrond Myklebust { 9538d92890bSNeilBrown dec_node_page_state(page, NR_WRITEBACK); 95493f78d88STejun Heo dec_wb_stat(&inode_to_bdi(page_file_mapping(page)->host)->wb, 9558d92890bSNeilBrown WB_WRITEBACK); 956e468bae9STrond Myklebust } 957d6d6dc7cSFred Isaman 958b5bab9bfSTrond Myklebust /* Called holding the request lock on @req */ 9598dd37758STrond Myklebust static void 960d6d6dc7cSFred Isaman nfs_clear_request_commit(struct nfs_page *req) 961d6d6dc7cSFred Isaman { 9628dd37758STrond Myklebust if (test_bit(PG_CLEAN, &req->wb_flags)) { 9639fcd5960STrond Myklebust struct nfs_open_context *ctx = nfs_req_openctx(req); 9649fcd5960STrond Myklebust struct inode *inode = d_inode(ctx->dentry); 965ea2cf228SFred Isaman struct nfs_commit_info cinfo; 966d6d6dc7cSFred Isaman 967ea2cf228SFred Isaman nfs_init_cinfo_from_inode(&cinfo, inode); 968e824f99aSTrond Myklebust mutex_lock(&NFS_I(inode)->commit_mutex); 969ea2cf228SFred Isaman if (!pnfs_clear_request_commit(req, &cinfo)) { 970ea2cf228SFred Isaman nfs_request_remove_commit_list(req, &cinfo); 971d6d6dc7cSFred Isaman } 972e824f99aSTrond Myklebust mutex_unlock(&NFS_I(inode)->commit_mutex); 9738dd37758STrond Myklebust nfs_clear_page_commit(req->wb_page); 9748dd37758STrond Myklebust } 975e468bae9STrond Myklebust } 976e468bae9STrond Myklebust 977d45f60c6SWeston Andros Adamson int nfs_write_need_commit(struct nfs_pgio_header *hdr) 9788e821cadSTrond Myklebust { 979c65e6254SWeston Andros Adamson if (hdr->verf.committed == NFS_DATA_SYNC) 980d45f60c6SWeston Andros Adamson return hdr->lseg == NULL; 981c65e6254SWeston Andros Adamson return hdr->verf.committed != NFS_FILE_SYNC; 9828e821cadSTrond Myklebust } 9838e821cadSTrond Myklebust 984919e3bd9STrond Myklebust static void nfs_async_write_init(struct nfs_pgio_header *hdr) 985919e3bd9STrond Myklebust { 986919e3bd9STrond Myklebust nfs_io_completion_get(hdr->io_completion); 987919e3bd9STrond Myklebust } 988919e3bd9STrond Myklebust 989061ae2edSFred Isaman static void nfs_write_completion(struct nfs_pgio_header *hdr) 9906c75dc0dSFred Isaman { 991ea2cf228SFred Isaman struct nfs_commit_info cinfo; 9926c75dc0dSFred Isaman unsigned long bytes = 0; 9936c75dc0dSFred Isaman 9946c75dc0dSFred Isaman if (test_bit(NFS_IOHDR_REDO, &hdr->flags)) 9956c75dc0dSFred Isaman goto out; 996ea2cf228SFred Isaman nfs_init_cinfo_from_inode(&cinfo, hdr->inode); 9976c75dc0dSFred Isaman while (!list_empty(&hdr->pages)) { 9986c75dc0dSFred Isaman struct nfs_page *req = nfs_list_entry(hdr->pages.next); 9996c75dc0dSFred Isaman 10006c75dc0dSFred Isaman bytes += req->wb_bytes; 10016c75dc0dSFred Isaman nfs_list_remove_request(req); 10026c75dc0dSFred Isaman if (test_bit(NFS_IOHDR_ERROR, &hdr->flags) && 10036c75dc0dSFred Isaman (hdr->good_bytes < bytes)) { 1004af887e43STrond Myklebust trace_nfs_comp_error(hdr->inode, req, hdr->error); 10056fbda89bSTrond Myklebust nfs_mapping_set_error(req->wb_page, hdr->error); 10066c75dc0dSFred Isaman goto remove_req; 10076c75dc0dSFred Isaman } 1008c65e6254SWeston Andros Adamson if (nfs_write_need_commit(hdr)) { 100933344e0fSTrond Myklebust /* Reset wb_nio, since the write was successful. */ 101033344e0fSTrond Myklebust req->wb_nio = 0; 1011f79d06f5SAnna Schumaker memcpy(&req->wb_verf, &hdr->verf.verifier, sizeof(req->wb_verf)); 1012b57ff130SWeston Andros Adamson nfs_mark_request_commit(req, hdr->lseg, &cinfo, 1013a7d42ddbSWeston Andros Adamson hdr->pgio_mirror_idx); 10146c75dc0dSFred Isaman goto next; 10156c75dc0dSFred Isaman } 10166c75dc0dSFred Isaman remove_req: 10176c75dc0dSFred Isaman nfs_inode_remove_request(req); 10186c75dc0dSFred Isaman next: 101920633f04SWeston Andros Adamson nfs_end_page_writeback(req); 10203aff4ebbSTrond Myklebust nfs_release_request(req); 10216c75dc0dSFred Isaman } 10226c75dc0dSFred Isaman out: 1023919e3bd9STrond Myklebust nfs_io_completion_put(hdr->io_completion); 10246c75dc0dSFred Isaman hdr->release(hdr); 10256c75dc0dSFred Isaman } 10266c75dc0dSFred Isaman 1027ce59515cSAnna Schumaker unsigned long 1028ea2cf228SFred Isaman nfs_reqs_to_commit(struct nfs_commit_info *cinfo) 1029fb8a1f11STrond Myklebust { 10305cb953d4STrond Myklebust return atomic_long_read(&cinfo->mds->ncommit); 1031fb8a1f11STrond Myklebust } 1032fb8a1f11STrond Myklebust 1033e824f99aSTrond Myklebust /* NFS_I(cinfo->inode)->commit_mutex held by caller */ 10341763da12SFred Isaman int 1035ea2cf228SFred Isaman nfs_scan_commit_list(struct list_head *src, struct list_head *dst, 1036ea2cf228SFred Isaman struct nfs_commit_info *cinfo, int max) 1037d6d6dc7cSFred Isaman { 1038137da553STrond Myklebust struct nfs_page *req, *tmp; 1039d6d6dc7cSFred Isaman int ret = 0; 1040d6d6dc7cSFred Isaman 1041137da553STrond Myklebust list_for_each_entry_safe(req, tmp, src, wb_list) { 10427ad84aa9STrond Myklebust kref_get(&req->wb_kref); 10432ce209c4STrond Myklebust if (!nfs_lock_request(req)) { 1044137da553STrond Myklebust nfs_release_request(req); 1045137da553STrond Myklebust continue; 1046137da553STrond Myklebust } 1047ea2cf228SFred Isaman nfs_request_remove_commit_list(req, cinfo); 10485d2a9d9dSTrond Myklebust clear_bit(PG_COMMIT_TO_DS, &req->wb_flags); 10498dd37758STrond Myklebust nfs_list_add_request(req, dst); 1050d6d6dc7cSFred Isaman ret++; 10511763da12SFred Isaman if ((ret == max) && !cinfo->dreq) 1052d6d6dc7cSFred Isaman break; 1053e824f99aSTrond Myklebust cond_resched(); 1054d6d6dc7cSFred Isaman } 1055d6d6dc7cSFred Isaman return ret; 1056d6d6dc7cSFred Isaman } 10575d2a9d9dSTrond Myklebust EXPORT_SYMBOL_GPL(nfs_scan_commit_list); 1058d6d6dc7cSFred Isaman 10591da177e4SLinus Torvalds /* 10601da177e4SLinus Torvalds * nfs_scan_commit - Scan an inode for commit requests 10611da177e4SLinus Torvalds * @inode: NFS inode to scan 1062ea2cf228SFred Isaman * @dst: mds destination list 1063ea2cf228SFred Isaman * @cinfo: mds and ds lists of reqs ready to commit 10641da177e4SLinus Torvalds * 10651da177e4SLinus Torvalds * Moves requests from the inode's 'commit' request list. 10661da177e4SLinus Torvalds * The requests are *not* checked to ensure that they form a contiguous set. 10671da177e4SLinus Torvalds */ 10681763da12SFred Isaman int 1069ea2cf228SFred Isaman nfs_scan_commit(struct inode *inode, struct list_head *dst, 1070ea2cf228SFred Isaman struct nfs_commit_info *cinfo) 10711da177e4SLinus Torvalds { 1072d6d6dc7cSFred Isaman int ret = 0; 1073fb8a1f11STrond Myklebust 10745cb953d4STrond Myklebust if (!atomic_long_read(&cinfo->mds->ncommit)) 10755cb953d4STrond Myklebust return 0; 1076e824f99aSTrond Myklebust mutex_lock(&NFS_I(cinfo->inode)->commit_mutex); 10775cb953d4STrond Myklebust if (atomic_long_read(&cinfo->mds->ncommit) > 0) { 10788dd37758STrond Myklebust const int max = INT_MAX; 1079d6d6dc7cSFred Isaman 1080ea2cf228SFred Isaman ret = nfs_scan_commit_list(&cinfo->mds->list, dst, 1081ea2cf228SFred Isaman cinfo, max); 1082ea2cf228SFred Isaman ret += pnfs_scan_commit_lists(inode, cinfo, max - ret); 1083d6d6dc7cSFred Isaman } 1084e824f99aSTrond Myklebust mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex); 1085ff778d02STrond Myklebust return ret; 10861da177e4SLinus Torvalds } 1087d6d6dc7cSFred Isaman 10881da177e4SLinus Torvalds /* 1089e7d39069STrond Myklebust * Search for an existing write request, and attempt to update 1090e7d39069STrond Myklebust * it to reflect a new dirty region on a given page. 10911da177e4SLinus Torvalds * 1092e7d39069STrond Myklebust * If the attempt fails, then the existing request is flushed out 1093e7d39069STrond Myklebust * to disk. 10941da177e4SLinus Torvalds */ 1095e7d39069STrond Myklebust static struct nfs_page *nfs_try_to_update_request(struct inode *inode, 1096e7d39069STrond Myklebust struct page *page, 1097e7d39069STrond Myklebust unsigned int offset, 1098e7d39069STrond Myklebust unsigned int bytes) 10991da177e4SLinus Torvalds { 1100e7d39069STrond Myklebust struct nfs_page *req; 1101e7d39069STrond Myklebust unsigned int rqend; 1102e7d39069STrond Myklebust unsigned int end; 11031da177e4SLinus Torvalds int error; 1104277459d2STrond Myklebust 1105e7d39069STrond Myklebust end = offset + bytes; 1106e7d39069STrond Myklebust 1107f6032f21STrond Myklebust req = nfs_lock_and_join_requests(page); 1108f6032f21STrond Myklebust if (IS_ERR_OR_NULL(req)) 1109f6032f21STrond Myklebust return req; 11102bfc6e56SWeston Andros Adamson 1111e7d39069STrond Myklebust rqend = req->wb_offset + req->wb_bytes; 1112e7d39069STrond Myklebust /* 1113e7d39069STrond Myklebust * Tell the caller to flush out the request if 1114e7d39069STrond Myklebust * the offsets are non-contiguous. 1115e7d39069STrond Myklebust * Note: nfs_flush_incompatible() will already 1116e7d39069STrond Myklebust * have flushed out requests having wrong owners. 1117e7d39069STrond Myklebust */ 1118f6032f21STrond Myklebust if (offset > rqend || end < req->wb_offset) 1119e7d39069STrond Myklebust goto out_flushme; 1120e7d39069STrond Myklebust 11211da177e4SLinus Torvalds /* Okay, the request matches. Update the region */ 11221da177e4SLinus Torvalds if (offset < req->wb_offset) { 11231da177e4SLinus Torvalds req->wb_offset = offset; 11241da177e4SLinus Torvalds req->wb_pgbase = offset; 11251da177e4SLinus Torvalds } 11261da177e4SLinus Torvalds if (end > rqend) 11271da177e4SLinus Torvalds req->wb_bytes = end - req->wb_offset; 1128e7d39069STrond Myklebust else 1129e7d39069STrond Myklebust req->wb_bytes = rqend - req->wb_offset; 113033344e0fSTrond Myklebust req->wb_nio = 0; 1131e7d39069STrond Myklebust return req; 1132e7d39069STrond Myklebust out_flushme: 1133f6032f21STrond Myklebust /* 1134f6032f21STrond Myklebust * Note: we mark the request dirty here because 1135f6032f21STrond Myklebust * nfs_lock_and_join_requests() cannot preserve 1136f6032f21STrond Myklebust * commit flags, so we have to replay the write. 1137f6032f21STrond Myklebust */ 1138f6032f21STrond Myklebust nfs_mark_request_dirty(req); 1139f6032f21STrond Myklebust nfs_unlock_and_release_request(req); 1140e7d39069STrond Myklebust error = nfs_wb_page(inode, page); 1141f6032f21STrond Myklebust return (error < 0) ? ERR_PTR(error) : NULL; 1142e7d39069STrond Myklebust } 11431da177e4SLinus Torvalds 1144e7d39069STrond Myklebust /* 1145e7d39069STrond Myklebust * Try to update an existing write request, or create one if there is none. 1146e7d39069STrond Myklebust * 1147e7d39069STrond Myklebust * Note: Should always be called with the Page Lock held to prevent races 1148e7d39069STrond Myklebust * if we have to add a new request. Also assumes that the caller has 1149e7d39069STrond Myklebust * already called nfs_flush_incompatible() if necessary. 1150e7d39069STrond Myklebust */ 1151e7d39069STrond Myklebust static struct nfs_page * nfs_setup_write_request(struct nfs_open_context* ctx, 1152e7d39069STrond Myklebust struct page *page, unsigned int offset, unsigned int bytes) 1153e7d39069STrond Myklebust { 1154d56b4ddfSMel Gorman struct inode *inode = page_file_mapping(page)->host; 1155e7d39069STrond Myklebust struct nfs_page *req; 1156e7d39069STrond Myklebust 1157e7d39069STrond Myklebust req = nfs_try_to_update_request(inode, page, offset, bytes); 1158e7d39069STrond Myklebust if (req != NULL) 1159e7d39069STrond Myklebust goto out; 116028b1d3f5STrond Myklebust req = nfs_create_request(ctx, page, offset, bytes); 1161e7d39069STrond Myklebust if (IS_ERR(req)) 1162e7d39069STrond Myklebust goto out; 1163d6d6dc7cSFred Isaman nfs_inode_add_request(inode, req); 1164efc91ed0STrond Myklebust out: 116561e930a9STrond Myklebust return req; 11661da177e4SLinus Torvalds } 11671da177e4SLinus Torvalds 1168e7d39069STrond Myklebust static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page, 1169e7d39069STrond Myklebust unsigned int offset, unsigned int count) 1170e7d39069STrond Myklebust { 1171e7d39069STrond Myklebust struct nfs_page *req; 1172e7d39069STrond Myklebust 1173e7d39069STrond Myklebust req = nfs_setup_write_request(ctx, page, offset, count); 1174e7d39069STrond Myklebust if (IS_ERR(req)) 1175e7d39069STrond Myklebust return PTR_ERR(req); 1176e7d39069STrond Myklebust /* Update file length */ 1177e7d39069STrond Myklebust nfs_grow_file(page, offset, count); 1178d72ddcbaSWeston Andros Adamson nfs_mark_uptodate(req); 1179a6305ddbSTrond Myklebust nfs_mark_request_dirty(req); 11801d1afcbcSTrond Myklebust nfs_unlock_and_release_request(req); 1181e7d39069STrond Myklebust return 0; 1182e7d39069STrond Myklebust } 1183e7d39069STrond Myklebust 11841da177e4SLinus Torvalds int nfs_flush_incompatible(struct file *file, struct page *page) 11851da177e4SLinus Torvalds { 1186cd3758e3STrond Myklebust struct nfs_open_context *ctx = nfs_file_open_context(file); 11872a369153STrond Myklebust struct nfs_lock_context *l_ctx; 1188*17b985deSJeff Layton struct file_lock_context *flctx = locks_inode_context(file_inode(file)); 11891da177e4SLinus Torvalds struct nfs_page *req; 11901a54533eSTrond Myklebust int do_flush, status; 11911da177e4SLinus Torvalds /* 11921da177e4SLinus Torvalds * Look for a request corresponding to this page. If there 11931da177e4SLinus Torvalds * is one, and it belongs to another file, we flush it out 11941da177e4SLinus Torvalds * before we try to copy anything into the page. Do this 11951da177e4SLinus Torvalds * due to the lack of an ACCESS-type call in NFSv2. 11961da177e4SLinus Torvalds * Also do the same if we find a request from an existing 11971da177e4SLinus Torvalds * dropped page. 11981da177e4SLinus Torvalds */ 11991a54533eSTrond Myklebust do { 120084d3a9a9SWeston Andros Adamson req = nfs_page_find_head_request(page); 12011a54533eSTrond Myklebust if (req == NULL) 12021a54533eSTrond Myklebust return 0; 12032a369153STrond Myklebust l_ctx = req->wb_lock_context; 1204138a2935STrond Myklebust do_flush = req->wb_page != page || 12059fcd5960STrond Myklebust !nfs_match_open_context(nfs_req_openctx(req), ctx); 1206bd61e0a9SJeff Layton if (l_ctx && flctx && 1207bd61e0a9SJeff Layton !(list_empty_careful(&flctx->flc_posix) && 1208bd61e0a9SJeff Layton list_empty_careful(&flctx->flc_flock))) { 1209d51fdb87SNeilBrown do_flush |= l_ctx->lockowner != current->files; 12105263e31eSJeff Layton } 12111da177e4SLinus Torvalds nfs_release_request(req); 12121a54533eSTrond Myklebust if (!do_flush) 12131a54533eSTrond Myklebust return 0; 1214d56b4ddfSMel Gorman status = nfs_wb_page(page_file_mapping(page)->host, page); 12151a54533eSTrond Myklebust } while (status == 0); 12161a54533eSTrond Myklebust return status; 12171da177e4SLinus Torvalds } 12181da177e4SLinus Torvalds 12191da177e4SLinus Torvalds /* 1220dc24826bSAndy Adamson * Avoid buffered writes when a open context credential's key would 1221dc24826bSAndy Adamson * expire soon. 1222dc24826bSAndy Adamson * 1223dc24826bSAndy Adamson * Returns -EACCES if the key will expire within RPC_KEY_EXPIRE_FAIL. 1224dc24826bSAndy Adamson * 1225dc24826bSAndy Adamson * Return 0 and set a credential flag which triggers the inode to flush 1226dc24826bSAndy Adamson * and performs NFS_FILE_SYNC writes if the key will expired within 1227dc24826bSAndy Adamson * RPC_KEY_EXPIRE_TIMEO. 1228dc24826bSAndy Adamson */ 1229dc24826bSAndy Adamson int 1230dc24826bSAndy Adamson nfs_key_timeout_notify(struct file *filp, struct inode *inode) 1231dc24826bSAndy Adamson { 1232dc24826bSAndy Adamson struct nfs_open_context *ctx = nfs_file_open_context(filp); 1233dc24826bSAndy Adamson 1234ddf529eeSNeilBrown if (nfs_ctx_key_to_expire(ctx, inode) && 1235ca05cbaeSTrond Myklebust !rcu_access_pointer(ctx->ll_cred)) 1236ddf529eeSNeilBrown /* Already expired! */ 1237ddf529eeSNeilBrown return -EACCES; 1238ddf529eeSNeilBrown return 0; 1239dc24826bSAndy Adamson } 1240dc24826bSAndy Adamson 1241dc24826bSAndy Adamson /* 1242dc24826bSAndy Adamson * Test if the open context credential key is marked to expire soon. 1243dc24826bSAndy Adamson */ 1244ce52914eSScott Mayhew bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx, struct inode *inode) 1245dc24826bSAndy Adamson { 1246ce52914eSScott Mayhew struct rpc_auth *auth = NFS_SERVER(inode)->client->cl_auth; 1247ca05cbaeSTrond Myklebust struct rpc_cred *cred, *new, *old = NULL; 1248ddf529eeSNeilBrown struct auth_cred acred = { 1249a52458b4SNeilBrown .cred = ctx->cred, 1250ddf529eeSNeilBrown }; 1251ca05cbaeSTrond Myklebust bool ret = false; 1252ce52914eSScott Mayhew 1253ca05cbaeSTrond Myklebust rcu_read_lock(); 1254ca05cbaeSTrond Myklebust cred = rcu_dereference(ctx->ll_cred); 1255ca05cbaeSTrond Myklebust if (cred && !(cred->cr_ops->crkey_timeout && 1256ca05cbaeSTrond Myklebust cred->cr_ops->crkey_timeout(cred))) 1257ca05cbaeSTrond Myklebust goto out; 1258ca05cbaeSTrond Myklebust rcu_read_unlock(); 1259ca05cbaeSTrond Myklebust 1260ca05cbaeSTrond Myklebust new = auth->au_ops->lookup_cred(auth, &acred, 0); 1261ca05cbaeSTrond Myklebust if (new == cred) { 1262ca05cbaeSTrond Myklebust put_rpccred(new); 1263ddf529eeSNeilBrown return true; 1264ca05cbaeSTrond Myklebust } 1265ca05cbaeSTrond Myklebust if (IS_ERR_OR_NULL(new)) { 1266ca05cbaeSTrond Myklebust new = NULL; 1267ca05cbaeSTrond Myklebust ret = true; 1268ca05cbaeSTrond Myklebust } else if (new->cr_ops->crkey_timeout && 1269ca05cbaeSTrond Myklebust new->cr_ops->crkey_timeout(new)) 1270ca05cbaeSTrond Myklebust ret = true; 1271ca05cbaeSTrond Myklebust 1272ca05cbaeSTrond Myklebust rcu_read_lock(); 1273ca05cbaeSTrond Myklebust old = rcu_dereference_protected(xchg(&ctx->ll_cred, 1274ca05cbaeSTrond Myklebust RCU_INITIALIZER(new)), 1); 1275ca05cbaeSTrond Myklebust out: 1276ca05cbaeSTrond Myklebust rcu_read_unlock(); 1277ca05cbaeSTrond Myklebust put_rpccred(old); 1278ca05cbaeSTrond Myklebust return ret; 1279dc24826bSAndy Adamson } 1280dc24826bSAndy Adamson 1281dc24826bSAndy Adamson /* 12825d47a356STrond Myklebust * If the page cache is marked as unsafe or invalid, then we can't rely on 12835d47a356STrond Myklebust * the PageUptodate() flag. In this case, we will need to turn off 12845d47a356STrond Myklebust * write optimisations that depend on the page contents being correct. 12855d47a356STrond Myklebust */ 1286fc9dc401STrond Myklebust static bool nfs_write_pageuptodate(struct page *page, struct inode *inode, 1287fc9dc401STrond Myklebust unsigned int pagelen) 12885d47a356STrond Myklebust { 1289d529ef83SJeff Layton struct nfs_inode *nfsi = NFS_I(inode); 1290d529ef83SJeff Layton 12918d197a56STrond Myklebust if (nfs_have_delegated_attributes(inode)) 12928d197a56STrond Myklebust goto out; 1293fc9dc401STrond Myklebust if (nfsi->cache_validity & 129413c0b082STrond Myklebust (NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_SIZE)) 1295d529ef83SJeff Layton return false; 12964db72b40SJeff Layton smp_rmb(); 1297fc9dc401STrond Myklebust if (test_bit(NFS_INO_INVALIDATING, &nfsi->flags) && pagelen != 0) 12988d197a56STrond Myklebust return false; 12998d197a56STrond Myklebust out: 1300fc9dc401STrond Myklebust if (nfsi->cache_validity & NFS_INO_INVALID_DATA && pagelen != 0) 130118dd78c4SScott Mayhew return false; 13028d197a56STrond Myklebust return PageUptodate(page) != 0; 13035d47a356STrond Myklebust } 13045d47a356STrond Myklebust 13055263e31eSJeff Layton static bool 13065263e31eSJeff Layton is_whole_file_wrlock(struct file_lock *fl) 13075263e31eSJeff Layton { 13085263e31eSJeff Layton return fl->fl_start == 0 && fl->fl_end == OFFSET_MAX && 13095263e31eSJeff Layton fl->fl_type == F_WRLCK; 13105263e31eSJeff Layton } 13115263e31eSJeff Layton 1312c7559663SScott Mayhew /* If we know the page is up to date, and we're not using byte range locks (or 1313c7559663SScott Mayhew * if we have the whole file locked for writing), it may be more efficient to 1314c7559663SScott Mayhew * extend the write to cover the entire page in order to avoid fragmentation 1315c7559663SScott Mayhew * inefficiencies. 1316c7559663SScott Mayhew * 1317263b4509SScott Mayhew * If the file is opened for synchronous writes then we can just skip the rest 1318263b4509SScott Mayhew * of the checks. 1319c7559663SScott Mayhew */ 1320fc9dc401STrond Myklebust static int nfs_can_extend_write(struct file *file, struct page *page, 1321fc9dc401STrond Myklebust struct inode *inode, unsigned int pagelen) 1322c7559663SScott Mayhew { 13235263e31eSJeff Layton int ret; 1324*17b985deSJeff Layton struct file_lock_context *flctx = locks_inode_context(inode); 13255263e31eSJeff Layton struct file_lock *fl; 13265263e31eSJeff Layton 1327c7559663SScott Mayhew if (file->f_flags & O_DSYNC) 1328c7559663SScott Mayhew return 0; 1329fc9dc401STrond Myklebust if (!nfs_write_pageuptodate(page, inode, pagelen)) 1330263b4509SScott Mayhew return 0; 1331c7559663SScott Mayhew if (NFS_PROTO(inode)->have_delegation(inode, FMODE_WRITE)) 1332c7559663SScott Mayhew return 1; 1333bd61e0a9SJeff Layton if (!flctx || (list_empty_careful(&flctx->flc_flock) && 1334bd61e0a9SJeff Layton list_empty_careful(&flctx->flc_posix))) 13358fa4592aSTrond Myklebust return 1; 13365263e31eSJeff Layton 13375263e31eSJeff Layton /* Check to see if there are whole file write locks */ 13385263e31eSJeff Layton ret = 0; 13396109c850SJeff Layton spin_lock(&flctx->flc_lock); 1340bd61e0a9SJeff Layton if (!list_empty(&flctx->flc_posix)) { 1341bd61e0a9SJeff Layton fl = list_first_entry(&flctx->flc_posix, struct file_lock, 1342bd61e0a9SJeff Layton fl_list); 1343bd61e0a9SJeff Layton if (is_whole_file_wrlock(fl)) 13445263e31eSJeff Layton ret = 1; 1345bd61e0a9SJeff Layton } else if (!list_empty(&flctx->flc_flock)) { 13465263e31eSJeff Layton fl = list_first_entry(&flctx->flc_flock, struct file_lock, 13475263e31eSJeff Layton fl_list); 13485263e31eSJeff Layton if (fl->fl_type == F_WRLCK) 13495263e31eSJeff Layton ret = 1; 13505263e31eSJeff Layton } 13516109c850SJeff Layton spin_unlock(&flctx->flc_lock); 13525263e31eSJeff Layton return ret; 1353c7559663SScott Mayhew } 1354c7559663SScott Mayhew 13555d47a356STrond Myklebust /* 13561da177e4SLinus Torvalds * Update and possibly write a cached page of an NFS file. 13571da177e4SLinus Torvalds * 13581da177e4SLinus Torvalds * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad 13591da177e4SLinus Torvalds * things with a page scheduled for an RPC call (e.g. invalidate it). 13601da177e4SLinus Torvalds */ 13611da177e4SLinus Torvalds int nfs_updatepage(struct file *file, struct page *page, 13621da177e4SLinus Torvalds unsigned int offset, unsigned int count) 13631da177e4SLinus Torvalds { 1364cd3758e3STrond Myklebust struct nfs_open_context *ctx = nfs_file_open_context(file); 1365d2ceb7e5SBenjamin Coddington struct address_space *mapping = page_file_mapping(page); 1366d2ceb7e5SBenjamin Coddington struct inode *inode = mapping->host; 1367fc9dc401STrond Myklebust unsigned int pagelen = nfs_page_length(page); 13681da177e4SLinus Torvalds int status = 0; 13691da177e4SLinus Torvalds 137091d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE); 137191d5b470SChuck Lever 13726de1472fSAl Viro dprintk("NFS: nfs_updatepage(%pD2 %d@%lld)\n", 13736de1472fSAl Viro file, count, (long long)(page_file_offset(page) + offset)); 13741da177e4SLinus Torvalds 1375149a4fddSBenjamin Coddington if (!count) 1376149a4fddSBenjamin Coddington goto out; 1377149a4fddSBenjamin Coddington 1378fc9dc401STrond Myklebust if (nfs_can_extend_write(file, page, inode, pagelen)) { 1379fc9dc401STrond Myklebust count = max(count + offset, pagelen); 13801da177e4SLinus Torvalds offset = 0; 13811da177e4SLinus Torvalds } 13821da177e4SLinus Torvalds 1383e21195a7STrond Myklebust status = nfs_writepage_setup(ctx, page, offset, count); 138403fa9e84STrond Myklebust if (status < 0) 1385d2ceb7e5SBenjamin Coddington nfs_set_pageerror(mapping); 1386149a4fddSBenjamin Coddington out: 138748186c7dSChuck Lever dprintk("NFS: nfs_updatepage returns %d (isize %lld)\n", 13881da177e4SLinus Torvalds status, (long long)i_size_read(inode)); 13891da177e4SLinus Torvalds return status; 13901da177e4SLinus Torvalds } 13911da177e4SLinus Torvalds 13923ff7576dSTrond Myklebust static int flush_task_priority(int how) 13931da177e4SLinus Torvalds { 13941da177e4SLinus Torvalds switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) { 13951da177e4SLinus Torvalds case FLUSH_HIGHPRI: 13961da177e4SLinus Torvalds return RPC_PRIORITY_HIGH; 13971da177e4SLinus Torvalds case FLUSH_LOWPRI: 13981da177e4SLinus Torvalds return RPC_PRIORITY_LOW; 13991da177e4SLinus Torvalds } 14001da177e4SLinus Torvalds return RPC_PRIORITY_NORMAL; 14011da177e4SLinus Torvalds } 14021da177e4SLinus Torvalds 1403d45f60c6SWeston Andros Adamson static void nfs_initiate_write(struct nfs_pgio_header *hdr, 1404d45f60c6SWeston Andros Adamson struct rpc_message *msg, 1405abde71f4STom Haynes const struct nfs_rpc_ops *rpc_ops, 14061ed26f33SAnna Schumaker struct rpc_task_setup *task_setup_data, int how) 14071da177e4SLinus Torvalds { 14083ff7576dSTrond Myklebust int priority = flush_task_priority(how); 14091da177e4SLinus Torvalds 14108db55a03SNeilBrown if (IS_SWAPFILE(hdr->inode)) 14118db55a03SNeilBrown task_setup_data->flags |= RPC_TASK_SWAPPER; 14121ed26f33SAnna Schumaker task_setup_data->priority = priority; 1413fb91fb0eSAnna Schumaker rpc_ops->write_setup(hdr, msg, &task_setup_data->rpc_client); 14145bb2a7cbSTrond Myklebust trace_nfs_initiate_write(hdr); 1415275acaafSTrond Myklebust } 1416275acaafSTrond Myklebust 14176d884e8fSFred /* If a nfs_flush_* function fails, it should remove reqs from @head and 14186d884e8fSFred * call this on each, which will prepare them to be retried on next 14196d884e8fSFred * writeback using standard nfs. 14206d884e8fSFred */ 14216d884e8fSFred static void nfs_redirty_request(struct nfs_page *req) 14226d884e8fSFred { 142367f4b5dcSTrond Myklebust struct nfs_inode *nfsi = NFS_I(page_file_mapping(req->wb_page)->host); 142467f4b5dcSTrond Myklebust 142533344e0fSTrond Myklebust /* Bump the transmission count */ 142633344e0fSTrond Myklebust req->wb_nio++; 14276d884e8fSFred nfs_mark_request_dirty(req); 142867f4b5dcSTrond Myklebust atomic_long_inc(&nfsi->redirtied_pages); 142920633f04SWeston Andros Adamson nfs_end_page_writeback(req); 14303aff4ebbSTrond Myklebust nfs_release_request(req); 14316d884e8fSFred } 14326d884e8fSFred 1433df3accb8STrond Myklebust static void nfs_async_write_error(struct list_head *head, int error) 14346c75dc0dSFred Isaman { 14356c75dc0dSFred Isaman struct nfs_page *req; 14366c75dc0dSFred Isaman 14376c75dc0dSFred Isaman while (!list_empty(head)) { 14386c75dc0dSFred Isaman req = nfs_list_entry(head->next); 14396c75dc0dSFred Isaman nfs_list_remove_request(req); 1440cea9ba72STrond Myklebust if (nfs_error_is_fatal_on_server(error)) 14416fbda89bSTrond Myklebust nfs_write_error(req, error); 14426fbda89bSTrond Myklebust else 14436c75dc0dSFred Isaman nfs_redirty_request(req); 14446c75dc0dSFred Isaman } 14456c75dc0dSFred Isaman } 14466c75dc0dSFred Isaman 1447dc602dd7STrond Myklebust static void nfs_async_write_reschedule_io(struct nfs_pgio_header *hdr) 1448dc602dd7STrond Myklebust { 1449df3accb8STrond Myklebust nfs_async_write_error(&hdr->pages, 0); 1450dc602dd7STrond Myklebust } 1451dc602dd7STrond Myklebust 1452061ae2edSFred Isaman static const struct nfs_pgio_completion_ops nfs_async_write_completion_ops = { 1453919e3bd9STrond Myklebust .init_hdr = nfs_async_write_init, 1454061ae2edSFred Isaman .error_cleanup = nfs_async_write_error, 1455061ae2edSFred Isaman .completion = nfs_write_completion, 1456dc602dd7STrond Myklebust .reschedule_io = nfs_async_write_reschedule_io, 1457061ae2edSFred Isaman }; 1458061ae2edSFred Isaman 145957208fa7SBryan Schumaker void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, 1460a20c93e3SChristoph Hellwig struct inode *inode, int ioflags, bool force_mds, 1461061ae2edSFred Isaman const struct nfs_pgio_completion_ops *compl_ops) 14621751c363STrond Myklebust { 1463a20c93e3SChristoph Hellwig struct nfs_server *server = NFS_SERVER(inode); 146441d8d5b7SAnna Schumaker const struct nfs_pageio_ops *pg_ops = &nfs_pgio_rw_ops; 1465a20c93e3SChristoph Hellwig 1466a20c93e3SChristoph Hellwig #ifdef CONFIG_NFS_V4_1 1467a20c93e3SChristoph Hellwig if (server->pnfs_curr_ld && !force_mds) 1468a20c93e3SChristoph Hellwig pg_ops = server->pnfs_curr_ld->pg_write_ops; 1469a20c93e3SChristoph Hellwig #endif 14704a0de55cSAnna Schumaker nfs_pageio_init(pgio, inode, pg_ops, compl_ops, &nfs_rw_write_ops, 14713bde7afdSTrond Myklebust server->wsize, ioflags); 14721751c363STrond Myklebust } 1473ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_pageio_init_write); 14741751c363STrond Myklebust 1475dce81290STrond Myklebust void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio) 1476dce81290STrond Myklebust { 1477a7d42ddbSWeston Andros Adamson struct nfs_pgio_mirror *mirror; 1478a7d42ddbSWeston Andros Adamson 14796f29b9bbSKinglong Mee if (pgio->pg_ops && pgio->pg_ops->pg_cleanup) 14806f29b9bbSKinglong Mee pgio->pg_ops->pg_cleanup(pgio); 14816f29b9bbSKinglong Mee 148241d8d5b7SAnna Schumaker pgio->pg_ops = &nfs_pgio_rw_ops; 1483a7d42ddbSWeston Andros Adamson 1484a7d42ddbSWeston Andros Adamson nfs_pageio_stop_mirroring(pgio); 1485a7d42ddbSWeston Andros Adamson 1486a7d42ddbSWeston Andros Adamson mirror = &pgio->pg_mirrors[0]; 1487a7d42ddbSWeston Andros Adamson mirror->pg_bsize = NFS_SERVER(pgio->pg_inode)->wsize; 1488dce81290STrond Myklebust } 14891f945357STrond Myklebust EXPORT_SYMBOL_GPL(nfs_pageio_reset_write_mds); 1490dce81290STrond Myklebust 14911da177e4SLinus Torvalds 14920b7c0153SFred Isaman void nfs_commit_prepare(struct rpc_task *task, void *calldata) 14930b7c0153SFred Isaman { 14940b7c0153SFred Isaman struct nfs_commit_data *data = calldata; 14950b7c0153SFred Isaman 14960b7c0153SFred Isaman NFS_PROTO(data->inode)->commit_rpc_prepare(task, data); 14970b7c0153SFred Isaman } 14980b7c0153SFred Isaman 1499a08a8cd3STrond Myklebust static void nfs_writeback_check_extend(struct nfs_pgio_header *hdr, 1500a08a8cd3STrond Myklebust struct nfs_fattr *fattr) 1501a08a8cd3STrond Myklebust { 1502a08a8cd3STrond Myklebust struct nfs_pgio_args *argp = &hdr->args; 1503a08a8cd3STrond Myklebust struct nfs_pgio_res *resp = &hdr->res; 15042b83d3deSTrond Myklebust u64 size = argp->offset + resp->count; 1505a08a8cd3STrond Myklebust 1506a08a8cd3STrond Myklebust if (!(fattr->valid & NFS_ATTR_FATTR_SIZE)) 15072b83d3deSTrond Myklebust fattr->size = size; 15082b83d3deSTrond Myklebust if (nfs_size_to_loff_t(fattr->size) < i_size_read(hdr->inode)) { 15092b83d3deSTrond Myklebust fattr->valid &= ~NFS_ATTR_FATTR_SIZE; 1510a08a8cd3STrond Myklebust return; 15112b83d3deSTrond Myklebust } 15122b83d3deSTrond Myklebust if (size != fattr->size) 1513a08a8cd3STrond Myklebust return; 1514a08a8cd3STrond Myklebust /* Set attribute barrier */ 1515a08a8cd3STrond Myklebust nfs_fattr_set_barrier(fattr); 15162b83d3deSTrond Myklebust /* ...and update size */ 15172b83d3deSTrond Myklebust fattr->valid |= NFS_ATTR_FATTR_SIZE; 1518a08a8cd3STrond Myklebust } 1519a08a8cd3STrond Myklebust 1520a08a8cd3STrond Myklebust void nfs_writeback_update_inode(struct nfs_pgio_header *hdr) 1521a08a8cd3STrond Myklebust { 15222b83d3deSTrond Myklebust struct nfs_fattr *fattr = &hdr->fattr; 1523a08a8cd3STrond Myklebust struct inode *inode = hdr->inode; 1524a08a8cd3STrond Myklebust 1525a08a8cd3STrond Myklebust spin_lock(&inode->i_lock); 1526a08a8cd3STrond Myklebust nfs_writeback_check_extend(hdr, fattr); 1527a08a8cd3STrond Myklebust nfs_post_op_update_inode_force_wcc_locked(inode, fattr); 1528a08a8cd3STrond Myklebust spin_unlock(&inode->i_lock); 1529a08a8cd3STrond Myklebust } 1530a08a8cd3STrond Myklebust EXPORT_SYMBOL_GPL(nfs_writeback_update_inode); 1531a08a8cd3STrond Myklebust 15321da177e4SLinus Torvalds /* 15331da177e4SLinus Torvalds * This function is called when the WRITE call is complete. 15341da177e4SLinus Torvalds */ 1535d45f60c6SWeston Andros Adamson static int nfs_writeback_done(struct rpc_task *task, 1536d45f60c6SWeston Andros Adamson struct nfs_pgio_header *hdr, 15370eecb214SAnna Schumaker struct inode *inode) 15381da177e4SLinus Torvalds { 1539788e7a89STrond Myklebust int status; 15401da177e4SLinus Torvalds 1541f551e44fSChuck Lever /* 1542f551e44fSChuck Lever * ->write_done will attempt to use post-op attributes to detect 1543f551e44fSChuck Lever * conflicting writes by other clients. A strict interpretation 1544f551e44fSChuck Lever * of close-to-open would allow us to continue caching even if 1545f551e44fSChuck Lever * another writer had changed the file, but some applications 1546f551e44fSChuck Lever * depend on tighter cache coherency when writing. 1547f551e44fSChuck Lever */ 1548d45f60c6SWeston Andros Adamson status = NFS_PROTO(inode)->write_done(task, hdr); 1549788e7a89STrond Myklebust if (status != 0) 15500eecb214SAnna Schumaker return status; 15518224b273SChuck Lever 1552d45f60c6SWeston Andros Adamson nfs_add_stats(inode, NFSIOS_SERVERWRITTENBYTES, hdr->res.count); 15535bb2a7cbSTrond Myklebust trace_nfs_writeback_done(task, hdr); 155491d5b470SChuck Lever 155569d96651SJeff Layton if (task->tk_status >= 0) { 155669d96651SJeff Layton enum nfs3_stable_how committed = hdr->res.verf->committed; 155769d96651SJeff Layton 155869d96651SJeff Layton if (committed == NFS_UNSTABLE) { 155969d96651SJeff Layton /* 156069d96651SJeff Layton * We have some uncommitted data on the server at 156169d96651SJeff Layton * this point, so ensure that we keep track of that 156269d96651SJeff Layton * fact irrespective of what later writes do. 156369d96651SJeff Layton */ 156469d96651SJeff Layton set_bit(NFS_IOHDR_UNSTABLE_WRITES, &hdr->flags); 156569d96651SJeff Layton } 156669d96651SJeff Layton 156769d96651SJeff Layton if (committed < hdr->args.stable) { 15681da177e4SLinus Torvalds /* We tried a write call, but the server did not 15691da177e4SLinus Torvalds * commit data to stable storage even though we 15701da177e4SLinus Torvalds * requested it. 15711da177e4SLinus Torvalds * Note: There is a known bug in Tru64 < 5.0 in which 15721da177e4SLinus Torvalds * the server reports NFS_DATA_SYNC, but performs 15731da177e4SLinus Torvalds * NFS_FILE_SYNC. We therefore implement this checking 15741da177e4SLinus Torvalds * as a dprintk() in order to avoid filling syslog. 15751da177e4SLinus Torvalds */ 15761da177e4SLinus Torvalds static unsigned long complain; 15771da177e4SLinus Torvalds 1578a69aef14SFred Isaman /* Note this will print the MDS for a DS write */ 15791da177e4SLinus Torvalds if (time_before(complain, jiffies)) { 15801da177e4SLinus Torvalds dprintk("NFS: faulty NFS server %s:" 15811da177e4SLinus Torvalds " (committed = %d) != (stable = %d)\n", 1582cd841605SFred Isaman NFS_SERVER(inode)->nfs_client->cl_hostname, 158369d96651SJeff Layton committed, hdr->args.stable); 15841da177e4SLinus Torvalds complain = jiffies + 300 * HZ; 15851da177e4SLinus Torvalds } 15861da177e4SLinus Torvalds } 158769d96651SJeff Layton } 15881f2edbe3STrond Myklebust 15891f2edbe3STrond Myklebust /* Deal with the suid/sgid bit corner case */ 159016e14375STrond Myklebust if (nfs_should_remove_suid(inode)) { 159116e14375STrond Myklebust spin_lock(&inode->i_lock); 1592720869ebSTrond Myklebust nfs_set_cache_invalid(inode, NFS_INO_INVALID_MODE); 159316e14375STrond Myklebust spin_unlock(&inode->i_lock); 159416e14375STrond Myklebust } 15950eecb214SAnna Schumaker return 0; 15960eecb214SAnna Schumaker } 15970eecb214SAnna Schumaker 15980eecb214SAnna Schumaker /* 15990eecb214SAnna Schumaker * This function is called when the WRITE call is complete. 16000eecb214SAnna Schumaker */ 1601d45f60c6SWeston Andros Adamson static void nfs_writeback_result(struct rpc_task *task, 1602d45f60c6SWeston Andros Adamson struct nfs_pgio_header *hdr) 16030eecb214SAnna Schumaker { 1604d45f60c6SWeston Andros Adamson struct nfs_pgio_args *argp = &hdr->args; 1605d45f60c6SWeston Andros Adamson struct nfs_pgio_res *resp = &hdr->res; 16061f2edbe3STrond Myklebust 16071f2edbe3STrond Myklebust if (resp->count < argp->count) { 16081da177e4SLinus Torvalds static unsigned long complain; 16091da177e4SLinus Torvalds 16106c75dc0dSFred Isaman /* This a short write! */ 1611d45f60c6SWeston Andros Adamson nfs_inc_stats(hdr->inode, NFSIOS_SHORTWRITE); 161291d5b470SChuck Lever 16131da177e4SLinus Torvalds /* Has the server at least made some progress? */ 16146c75dc0dSFred Isaman if (resp->count == 0) { 16156c75dc0dSFred Isaman if (time_before(complain, jiffies)) { 16166c75dc0dSFred Isaman printk(KERN_WARNING 16176c75dc0dSFred Isaman "NFS: Server wrote zero bytes, expected %u.\n", 16186c75dc0dSFred Isaman argp->count); 16196c75dc0dSFred Isaman complain = jiffies + 300 * HZ; 16206c75dc0dSFred Isaman } 1621d45f60c6SWeston Andros Adamson nfs_set_pgio_error(hdr, -EIO, argp->offset); 16226c75dc0dSFred Isaman task->tk_status = -EIO; 16236c75dc0dSFred Isaman return; 16246c75dc0dSFred Isaman } 1625f8417b48SKinglong Mee 1626f8417b48SKinglong Mee /* For non rpc-based layout drivers, retry-through-MDS */ 1627f8417b48SKinglong Mee if (!task->tk_ops) { 1628f8417b48SKinglong Mee hdr->pnfs_error = -EAGAIN; 1629f8417b48SKinglong Mee return; 1630f8417b48SKinglong Mee } 1631f8417b48SKinglong Mee 16321da177e4SLinus Torvalds /* Was this an NFSv2 write or an NFSv3 stable write? */ 16331da177e4SLinus Torvalds if (resp->verf->committed != NFS_UNSTABLE) { 16341da177e4SLinus Torvalds /* Resend from where the server left off */ 1635d45f60c6SWeston Andros Adamson hdr->mds_offset += resp->count; 16361da177e4SLinus Torvalds argp->offset += resp->count; 16371da177e4SLinus Torvalds argp->pgbase += resp->count; 16381da177e4SLinus Torvalds argp->count -= resp->count; 16391da177e4SLinus Torvalds } else { 16401da177e4SLinus Torvalds /* Resend as a stable write in order to avoid 16411da177e4SLinus Torvalds * headaches in the case of a server crash. 16421da177e4SLinus Torvalds */ 16431da177e4SLinus Torvalds argp->stable = NFS_FILE_SYNC; 16441da177e4SLinus Torvalds } 16458c9cb714STrond Myklebust resp->count = 0; 16468c9cb714STrond Myklebust resp->verf->committed = 0; 1647d00c5d43STrond Myklebust rpc_restart_call_prepare(task); 16481da177e4SLinus Torvalds } 16491da177e4SLinus Torvalds } 16501da177e4SLinus Torvalds 1651af7cf057STrond Myklebust static int wait_on_commit(struct nfs_mds_commit_info *cinfo) 165271d0a611STrond Myklebust { 1653723c921eSPeter Zijlstra return wait_var_event_killable(&cinfo->rpcs_out, 1654723c921eSPeter Zijlstra !atomic_read(&cinfo->rpcs_out)); 1655af7cf057STrond Myklebust } 1656af7cf057STrond Myklebust 1657af7cf057STrond Myklebust static void nfs_commit_begin(struct nfs_mds_commit_info *cinfo) 1658af7cf057STrond Myklebust { 1659af7cf057STrond Myklebust atomic_inc(&cinfo->rpcs_out); 1660af7cf057STrond Myklebust } 1661af7cf057STrond Myklebust 1662133a48abSTrond Myklebust bool nfs_commit_end(struct nfs_mds_commit_info *cinfo) 1663af7cf057STrond Myklebust { 1664133a48abSTrond Myklebust if (atomic_dec_and_test(&cinfo->rpcs_out)) { 1665723c921eSPeter Zijlstra wake_up_var(&cinfo->rpcs_out); 1666133a48abSTrond Myklebust return true; 1667133a48abSTrond Myklebust } 1668133a48abSTrond Myklebust return false; 166971d0a611STrond Myklebust } 167071d0a611STrond Myklebust 16710b7c0153SFred Isaman void nfs_commitdata_release(struct nfs_commit_data *data) 16721da177e4SLinus Torvalds { 16730b7c0153SFred Isaman put_nfs_open_context(data->context); 16740b7c0153SFred Isaman nfs_commit_free(data); 16751da177e4SLinus Torvalds } 1676e0c2b380SFred Isaman EXPORT_SYMBOL_GPL(nfs_commitdata_release); 16771da177e4SLinus Torvalds 16780b7c0153SFred Isaman int nfs_initiate_commit(struct rpc_clnt *clnt, struct nfs_commit_data *data, 1679c36aae9aSPeng Tao const struct nfs_rpc_ops *nfs_ops, 16809ace33cdSFred Isaman const struct rpc_call_ops *call_ops, 16819f0ec176SAndy Adamson int how, int flags) 16821da177e4SLinus Torvalds { 168307737691STrond Myklebust struct rpc_task *task; 16849ace33cdSFred Isaman int priority = flush_task_priority(how); 1685bdc7f021STrond Myklebust struct rpc_message msg = { 1686bdc7f021STrond Myklebust .rpc_argp = &data->args, 1687bdc7f021STrond Myklebust .rpc_resp = &data->res, 16889ace33cdSFred Isaman .rpc_cred = data->cred, 1689bdc7f021STrond Myklebust }; 169084115e1cSTrond Myklebust struct rpc_task_setup task_setup_data = { 169107737691STrond Myklebust .task = &data->task, 16929ace33cdSFred Isaman .rpc_client = clnt, 1693bdc7f021STrond Myklebust .rpc_message = &msg, 16949ace33cdSFred Isaman .callback_ops = call_ops, 169584115e1cSTrond Myklebust .callback_data = data, 1696101070caSTrond Myklebust .workqueue = nfsiod_workqueue, 16974fa7ef69STrond Myklebust .flags = RPC_TASK_ASYNC | flags, 16983ff7576dSTrond Myklebust .priority = priority, 169984115e1cSTrond Myklebust }; 1700118f09edSOlga Kornievskaia 1701118f09edSOlga Kornievskaia if (nfs_server_capable(data->inode, NFS_CAP_MOVEABLE)) 1702118f09edSOlga Kornievskaia task_setup_data.flags |= RPC_TASK_MOVEABLE; 1703118f09edSOlga Kornievskaia 1704788e7a89STrond Myklebust /* Set up the initial task struct. */ 1705e9ae1ee2SAnna Schumaker nfs_ops->commit_setup(data, &msg, &task_setup_data.rpc_client); 17068224b273SChuck Lever trace_nfs_initiate_commit(data); 17071da177e4SLinus Torvalds 1708b4839ebeSKinglong Mee dprintk("NFS: initiated commit call\n"); 1709bdc7f021STrond Myklebust 171007737691STrond Myklebust task = rpc_run_task(&task_setup_data); 1711dbae4c73STrond Myklebust if (IS_ERR(task)) 1712dbae4c73STrond Myklebust return PTR_ERR(task); 1713d2224e7aSJeff Layton if (how & FLUSH_SYNC) 1714d2224e7aSJeff Layton rpc_wait_for_completion_task(task); 171507737691STrond Myklebust rpc_put_task(task); 1716dbae4c73STrond Myklebust return 0; 17171da177e4SLinus Torvalds } 1718e0c2b380SFred Isaman EXPORT_SYMBOL_GPL(nfs_initiate_commit); 17191da177e4SLinus Torvalds 1720378520b8SPeng Tao static loff_t nfs_get_lwb(struct list_head *head) 1721378520b8SPeng Tao { 1722378520b8SPeng Tao loff_t lwb = 0; 1723378520b8SPeng Tao struct nfs_page *req; 1724378520b8SPeng Tao 1725378520b8SPeng Tao list_for_each_entry(req, head, wb_list) 1726378520b8SPeng Tao if (lwb < (req_offset(req) + req->wb_bytes)) 1727378520b8SPeng Tao lwb = req_offset(req) + req->wb_bytes; 1728378520b8SPeng Tao 1729378520b8SPeng Tao return lwb; 1730378520b8SPeng Tao } 1731378520b8SPeng Tao 17321da177e4SLinus Torvalds /* 17339ace33cdSFred Isaman * Set up the argument/result storage required for the RPC call. 17349ace33cdSFred Isaman */ 17350b7c0153SFred Isaman void nfs_init_commit(struct nfs_commit_data *data, 1736988b6dceSFred Isaman struct list_head *head, 1737f453a54aSFred Isaman struct pnfs_layout_segment *lseg, 1738f453a54aSFred Isaman struct nfs_commit_info *cinfo) 17399ace33cdSFred Isaman { 174019573c93STrond Myklebust struct nfs_page *first; 174119573c93STrond Myklebust struct nfs_open_context *ctx; 174219573c93STrond Myklebust struct inode *inode; 17439ace33cdSFred Isaman 17449ace33cdSFred Isaman /* Set up the RPC argument and reply structs 17459ace33cdSFred Isaman * NB: take care not to mess about with data->commit et al. */ 17469ace33cdSFred Isaman 174719573c93STrond Myklebust if (head) 17489ace33cdSFred Isaman list_splice_init(head, &data->pages); 17499ace33cdSFred Isaman 175019573c93STrond Myklebust first = nfs_list_entry(data->pages.next); 175119573c93STrond Myklebust ctx = nfs_req_openctx(first); 175219573c93STrond Myklebust inode = d_inode(ctx->dentry); 175319573c93STrond Myklebust 17549ace33cdSFred Isaman data->inode = inode; 17559fcd5960STrond Myklebust data->cred = ctx->cred; 1756988b6dceSFred Isaman data->lseg = lseg; /* reference transferred */ 1757378520b8SPeng Tao /* only set lwb for pnfs commit */ 1758378520b8SPeng Tao if (lseg) 1759378520b8SPeng Tao data->lwb = nfs_get_lwb(&data->pages); 17609ace33cdSFred Isaman data->mds_ops = &nfs_commit_ops; 1761f453a54aSFred Isaman data->completion_ops = cinfo->completion_ops; 1762b359f9d0SFred Isaman data->dreq = cinfo->dreq; 17639ace33cdSFred Isaman 17649ace33cdSFred Isaman data->args.fh = NFS_FH(data->inode); 17659ace33cdSFred Isaman /* Note: we always request a commit of the entire inode */ 17669ace33cdSFred Isaman data->args.offset = 0; 17679ace33cdSFred Isaman data->args.count = 0; 17689fcd5960STrond Myklebust data->context = get_nfs_open_context(ctx); 17699ace33cdSFred Isaman data->res.fattr = &data->fattr; 17709ace33cdSFred Isaman data->res.verf = &data->verf; 17719ace33cdSFred Isaman nfs_fattr_init(&data->fattr); 1772133a48abSTrond Myklebust nfs_commit_begin(cinfo->mds); 17739ace33cdSFred Isaman } 1774e0c2b380SFred Isaman EXPORT_SYMBOL_GPL(nfs_init_commit); 17759ace33cdSFred Isaman 1776e0c2b380SFred Isaman void nfs_retry_commit(struct list_head *page_list, 1777ea2cf228SFred Isaman struct pnfs_layout_segment *lseg, 1778b57ff130SWeston Andros Adamson struct nfs_commit_info *cinfo, 1779b57ff130SWeston Andros Adamson u32 ds_commit_idx) 178064bfeb49SFred Isaman { 178164bfeb49SFred Isaman struct nfs_page *req; 178264bfeb49SFred Isaman 178364bfeb49SFred Isaman while (!list_empty(page_list)) { 178464bfeb49SFred Isaman req = nfs_list_entry(page_list->next); 178564bfeb49SFred Isaman nfs_list_remove_request(req); 1786b57ff130SWeston Andros Adamson nfs_mark_request_commit(req, lseg, cinfo, ds_commit_idx); 1787487b9b8aSTom Haynes if (!cinfo->dreq) 1788487b9b8aSTom Haynes nfs_clear_page_commit(req->wb_page); 17891d1afcbcSTrond Myklebust nfs_unlock_and_release_request(req); 179064bfeb49SFred Isaman } 179164bfeb49SFred Isaman } 1792e0c2b380SFred Isaman EXPORT_SYMBOL_GPL(nfs_retry_commit); 179364bfeb49SFred Isaman 1794b20135d0STrond Myklebust static void 1795b20135d0STrond Myklebust nfs_commit_resched_write(struct nfs_commit_info *cinfo, 1796b20135d0STrond Myklebust struct nfs_page *req) 1797b20135d0STrond Myklebust { 1798b20135d0STrond Myklebust __set_page_dirty_nobuffers(req->wb_page); 1799b20135d0STrond Myklebust } 1800b20135d0STrond Myklebust 18019ace33cdSFred Isaman /* 18021da177e4SLinus Torvalds * Commit dirty pages 18031da177e4SLinus Torvalds */ 18041da177e4SLinus Torvalds static int 1805ea2cf228SFred Isaman nfs_commit_list(struct inode *inode, struct list_head *head, int how, 1806ea2cf228SFred Isaman struct nfs_commit_info *cinfo) 18071da177e4SLinus Torvalds { 18080b7c0153SFred Isaman struct nfs_commit_data *data; 180985e39feeSOlga Kornievskaia unsigned short task_flags = 0; 18101da177e4SLinus Torvalds 1811ade8febdSWeston Andros Adamson /* another commit raced with us */ 1812ade8febdSWeston Andros Adamson if (list_empty(head)) 1813ade8febdSWeston Andros Adamson return 0; 1814ade8febdSWeston Andros Adamson 1815515dcdcdSTrond Myklebust data = nfs_commitdata_alloc(); 1816515dcdcdSTrond Myklebust if (!data) { 1817515dcdcdSTrond Myklebust nfs_retry_commit(head, NULL, cinfo, -1); 1818515dcdcdSTrond Myklebust return -ENOMEM; 1819515dcdcdSTrond Myklebust } 18201da177e4SLinus Torvalds 18211da177e4SLinus Torvalds /* Set up the argument struct */ 1822f453a54aSFred Isaman nfs_init_commit(data, head, NULL, cinfo); 182385e39feeSOlga Kornievskaia if (NFS_SERVER(inode)->nfs_client->cl_minorversion) 182485e39feeSOlga Kornievskaia task_flags = RPC_TASK_MOVEABLE; 1825c36aae9aSPeng Tao return nfs_initiate_commit(NFS_CLIENT(inode), data, NFS_PROTO(inode), 182685e39feeSOlga Kornievskaia data->mds_ops, how, 182785e39feeSOlga Kornievskaia RPC_TASK_CRED_NOREF | task_flags); 18281da177e4SLinus Torvalds } 18291da177e4SLinus Torvalds 18301da177e4SLinus Torvalds /* 18311da177e4SLinus Torvalds * COMMIT call returned 18321da177e4SLinus Torvalds */ 1833788e7a89STrond Myklebust static void nfs_commit_done(struct rpc_task *task, void *calldata) 18341da177e4SLinus Torvalds { 18350b7c0153SFred Isaman struct nfs_commit_data *data = calldata; 18361da177e4SLinus Torvalds 1837788e7a89STrond Myklebust /* Call the NFS version-specific code */ 1838c0d0e96bSTrond Myklebust NFS_PROTO(data->inode)->commit_done(task, data); 18397bdd297eSTrond Myklebust trace_nfs_commit_done(task, data); 1840c9d8f89dSTrond Myklebust } 1841c9d8f89dSTrond Myklebust 1842f453a54aSFred Isaman static void nfs_commit_release_pages(struct nfs_commit_data *data) 1843c9d8f89dSTrond Myklebust { 1844221203ceSTrond Myklebust const struct nfs_writeverf *verf = data->res.verf; 1845c9d8f89dSTrond Myklebust struct nfs_page *req; 1846c9d8f89dSTrond Myklebust int status = data->task.tk_status; 1847f453a54aSFred Isaman struct nfs_commit_info cinfo; 1848353db796SNeilBrown struct nfs_server *nfss; 1849788e7a89STrond Myklebust 18501da177e4SLinus Torvalds while (!list_empty(&data->pages)) { 18511da177e4SLinus Torvalds req = nfs_list_entry(data->pages.next); 18521da177e4SLinus Torvalds nfs_list_remove_request(req); 185367911c8fSAnna Schumaker if (req->wb_page) 1854d6d6dc7cSFred Isaman nfs_clear_page_commit(req->wb_page); 18551da177e4SLinus Torvalds 18561e8968c5SNiels de Vos dprintk("NFS: commit (%s/%llu %d@%lld)", 18579fcd5960STrond Myklebust nfs_req_openctx(req)->dentry->d_sb->s_id, 18589fcd5960STrond Myklebust (unsigned long long)NFS_FILEID(d_inode(nfs_req_openctx(req)->dentry)), 18591da177e4SLinus Torvalds req->wb_bytes, 18601da177e4SLinus Torvalds (long long)req_offset(req)); 1861c9d8f89dSTrond Myklebust if (status < 0) { 18626fbda89bSTrond Myklebust if (req->wb_page) { 1863af887e43STrond Myklebust trace_nfs_commit_error(data->inode, req, 1864af887e43STrond Myklebust status); 18656fbda89bSTrond Myklebust nfs_mapping_set_error(req->wb_page, status); 18661da177e4SLinus Torvalds nfs_inode_remove_request(req); 18676fbda89bSTrond Myklebust } 1868ddeaa637SJoe Perches dprintk_cont(", error = %d\n", status); 18691da177e4SLinus Torvalds goto next; 18701da177e4SLinus Torvalds } 18711da177e4SLinus Torvalds 18721da177e4SLinus Torvalds /* Okay, COMMIT succeeded, apparently. Check the verifier 18731da177e4SLinus Torvalds * returned by the server against all stored verfs. */ 18741f28476dSTrond Myklebust if (nfs_write_match_verf(verf, req)) { 18751da177e4SLinus Torvalds /* We have a match */ 187638a33101SKinglong Mee if (req->wb_page) 18771da177e4SLinus Torvalds nfs_inode_remove_request(req); 1878ddeaa637SJoe Perches dprintk_cont(" OK\n"); 18791da177e4SLinus Torvalds goto next; 18801da177e4SLinus Torvalds } 18811da177e4SLinus Torvalds /* We have a mismatch. Write the page again */ 1882ddeaa637SJoe Perches dprintk_cont(" mismatch\n"); 18836d884e8fSFred nfs_mark_request_dirty(req); 188467f4b5dcSTrond Myklebust atomic_long_inc(&NFS_I(data->inode)->redirtied_pages); 18851da177e4SLinus Torvalds next: 18861d1afcbcSTrond Myklebust nfs_unlock_and_release_request(req); 18877f1bda44STrond Myklebust /* Latency breaker */ 18887f1bda44STrond Myklebust cond_resched(); 18891da177e4SLinus Torvalds } 1890353db796SNeilBrown nfss = NFS_SERVER(data->inode); 1891353db796SNeilBrown if (atomic_long_read(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH) 18926df25e58SNeilBrown nfss->write_congested = 0; 1893353db796SNeilBrown 1894f453a54aSFred Isaman nfs_init_cinfo(&cinfo, data->inode, data->dreq); 1895af7cf057STrond Myklebust nfs_commit_end(cinfo.mds); 18965917ce84SFred Isaman } 18975917ce84SFred Isaman 18985917ce84SFred Isaman static void nfs_commit_release(void *calldata) 18995917ce84SFred Isaman { 19000b7c0153SFred Isaman struct nfs_commit_data *data = calldata; 19015917ce84SFred Isaman 1902f453a54aSFred Isaman data->completion_ops->completion(data); 1903c9d8f89dSTrond Myklebust nfs_commitdata_release(calldata); 19041da177e4SLinus Torvalds } 1905788e7a89STrond Myklebust 1906788e7a89STrond Myklebust static const struct rpc_call_ops nfs_commit_ops = { 19070b7c0153SFred Isaman .rpc_call_prepare = nfs_commit_prepare, 1908788e7a89STrond Myklebust .rpc_call_done = nfs_commit_done, 1909788e7a89STrond Myklebust .rpc_release = nfs_commit_release, 1910788e7a89STrond Myklebust }; 19111da177e4SLinus Torvalds 1912f453a54aSFred Isaman static const struct nfs_commit_completion_ops nfs_commit_completion_ops = { 1913f453a54aSFred Isaman .completion = nfs_commit_release_pages, 1914b20135d0STrond Myklebust .resched_write = nfs_commit_resched_write, 1915f453a54aSFred Isaman }; 1916f453a54aSFred Isaman 19171763da12SFred Isaman int nfs_generic_commit_list(struct inode *inode, struct list_head *head, 1918ea2cf228SFred Isaman int how, struct nfs_commit_info *cinfo) 191984c53ab5SFred Isaman { 192084c53ab5SFred Isaman int status; 192184c53ab5SFred Isaman 1922ea2cf228SFred Isaman status = pnfs_commit_list(inode, head, how, cinfo); 192384c53ab5SFred Isaman if (status == PNFS_NOT_ATTEMPTED) 1924ea2cf228SFred Isaman status = nfs_commit_list(inode, head, how, cinfo); 192584c53ab5SFred Isaman return status; 192684c53ab5SFred Isaman } 192784c53ab5SFred Isaman 1928c4f24df9STrond Myklebust static int __nfs_commit_inode(struct inode *inode, int how, 1929c4f24df9STrond Myklebust struct writeback_control *wbc) 19301da177e4SLinus Torvalds { 19311da177e4SLinus Torvalds LIST_HEAD(head); 1932ea2cf228SFred Isaman struct nfs_commit_info cinfo; 193371d0a611STrond Myklebust int may_wait = how & FLUSH_SYNC; 1934c4f24df9STrond Myklebust int ret, nscan; 19351da177e4SLinus Torvalds 193664a93dbfSTrond Myklebust how &= ~FLUSH_SYNC; 1937ea2cf228SFred Isaman nfs_init_cinfo_from_inode(&cinfo, inode); 1938af7cf057STrond Myklebust nfs_commit_begin(cinfo.mds); 1939c4f24df9STrond Myklebust for (;;) { 1940c4f24df9STrond Myklebust ret = nscan = nfs_scan_commit(inode, &head, &cinfo); 1941c4f24df9STrond Myklebust if (ret <= 0) 1942c4f24df9STrond Myklebust break; 1943c4f24df9STrond Myklebust ret = nfs_generic_commit_list(inode, &head, how, &cinfo); 1944c4f24df9STrond Myklebust if (ret < 0) 1945c4f24df9STrond Myklebust break; 1946c4f24df9STrond Myklebust ret = 0; 1947c4f24df9STrond Myklebust if (wbc && wbc->sync_mode == WB_SYNC_NONE) { 1948c4f24df9STrond Myklebust if (nscan < wbc->nr_to_write) 1949c4f24df9STrond Myklebust wbc->nr_to_write -= nscan; 1950c4f24df9STrond Myklebust else 1951c4f24df9STrond Myklebust wbc->nr_to_write = 0; 1952c4f24df9STrond Myklebust } 1953c4f24df9STrond Myklebust if (nscan < INT_MAX) 1954c4f24df9STrond Myklebust break; 1955c4f24df9STrond Myklebust cond_resched(); 1956c4f24df9STrond Myklebust } 1957af7cf057STrond Myklebust nfs_commit_end(cinfo.mds); 1958c4f24df9STrond Myklebust if (ret || !may_wait) 1959c4f24df9STrond Myklebust return ret; 1960c4f24df9STrond Myklebust return wait_on_commit(cinfo.mds); 1961c4f24df9STrond Myklebust } 1962c4f24df9STrond Myklebust 1963c4f24df9STrond Myklebust int nfs_commit_inode(struct inode *inode, int how) 1964c4f24df9STrond Myklebust { 1965c4f24df9STrond Myklebust return __nfs_commit_inode(inode, how, NULL); 19661da177e4SLinus Torvalds } 1967b20135d0STrond Myklebust EXPORT_SYMBOL_GPL(nfs_commit_inode); 19688fc795f7STrond Myklebust 1969ae09c31fSAnna Schumaker int nfs_write_inode(struct inode *inode, struct writeback_control *wbc) 19708fc795f7STrond Myklebust { 1971420e3646STrond Myklebust struct nfs_inode *nfsi = NFS_I(inode); 1972420e3646STrond Myklebust int flags = FLUSH_SYNC; 1973420e3646STrond Myklebust int ret = 0; 19748fc795f7STrond Myklebust 1975c4f24df9STrond Myklebust if (wbc->sync_mode == WB_SYNC_NONE) { 19763236c3e1SJeff Layton /* no commits means nothing needs to be done */ 19775cb953d4STrond Myklebust if (!atomic_long_read(&nfsi->commit_info.ncommit)) 1978c4f24df9STrond Myklebust goto check_requests_outstanding; 19793236c3e1SJeff Layton 1980a00dd6c0SJeff Layton /* Don't commit yet if this is a non-blocking flush and there 1981a00dd6c0SJeff Layton * are a lot of outstanding writes for this mapping. 1982420e3646STrond Myklebust */ 19831a4edf0fSTrond Myklebust if (mapping_tagged(inode->i_mapping, PAGECACHE_TAG_WRITEBACK)) 1984420e3646STrond Myklebust goto out_mark_dirty; 1985420e3646STrond Myklebust 1986a00dd6c0SJeff Layton /* don't wait for the COMMIT response */ 1987420e3646STrond Myklebust flags = 0; 1988a00dd6c0SJeff Layton } 1989a00dd6c0SJeff Layton 1990c4f24df9STrond Myklebust ret = __nfs_commit_inode(inode, flags, wbc); 1991c4f24df9STrond Myklebust if (!ret) { 1992c4f24df9STrond Myklebust if (flags & FLUSH_SYNC) 19938fc795f7STrond Myklebust return 0; 1994c4f24df9STrond Myklebust } else if (atomic_long_read(&nfsi->commit_info.ncommit)) 1995c4f24df9STrond Myklebust goto out_mark_dirty; 1996c4f24df9STrond Myklebust 1997c4f24df9STrond Myklebust check_requests_outstanding: 1998c4f24df9STrond Myklebust if (!atomic_read(&nfsi->commit_info.rpcs_out)) 1999c4f24df9STrond Myklebust return ret; 2000420e3646STrond Myklebust out_mark_dirty: 20018fc795f7STrond Myklebust __mark_inode_dirty(inode, I_DIRTY_DATASYNC); 20028fc795f7STrond Myklebust return ret; 20038fc795f7STrond Myklebust } 200489d77c8fSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_write_inode); 2005863a3c6cSAndy Adamson 2006acdc53b2STrond Myklebust /* 2007837bb1d7STrond Myklebust * Wrapper for filemap_write_and_wait_range() 2008837bb1d7STrond Myklebust * 2009837bb1d7STrond Myklebust * Needed for pNFS in order to ensure data becomes visible to the 2010837bb1d7STrond Myklebust * client. 2011837bb1d7STrond Myklebust */ 2012837bb1d7STrond Myklebust int nfs_filemap_write_and_wait_range(struct address_space *mapping, 2013837bb1d7STrond Myklebust loff_t lstart, loff_t lend) 2014837bb1d7STrond Myklebust { 2015837bb1d7STrond Myklebust int ret; 2016837bb1d7STrond Myklebust 2017837bb1d7STrond Myklebust ret = filemap_write_and_wait_range(mapping, lstart, lend); 2018837bb1d7STrond Myklebust if (ret == 0) 2019837bb1d7STrond Myklebust ret = pnfs_sync_inode(mapping->host, true); 2020837bb1d7STrond Myklebust return ret; 2021837bb1d7STrond Myklebust } 2022837bb1d7STrond Myklebust EXPORT_SYMBOL_GPL(nfs_filemap_write_and_wait_range); 2023837bb1d7STrond Myklebust 2024837bb1d7STrond Myklebust /* 2025acdc53b2STrond Myklebust * flush the inode to disk. 2026acdc53b2STrond Myklebust */ 2027acdc53b2STrond Myklebust int nfs_wb_all(struct inode *inode) 202834901f70STrond Myklebust { 2029f4ce1299STrond Myklebust int ret; 203034901f70STrond Myklebust 2031f4ce1299STrond Myklebust trace_nfs_writeback_inode_enter(inode); 2032f4ce1299STrond Myklebust 20335bb89b47STrond Myklebust ret = filemap_write_and_wait(inode->i_mapping); 20346b196875SChuck Lever if (ret) 20356b196875SChuck Lever goto out; 20365bb89b47STrond Myklebust ret = nfs_commit_inode(inode, FLUSH_SYNC); 20376b196875SChuck Lever if (ret < 0) 20386b196875SChuck Lever goto out; 20395bb89b47STrond Myklebust pnfs_sync_inode(inode, true); 20406b196875SChuck Lever ret = 0; 2041f4ce1299STrond Myklebust 20426b196875SChuck Lever out: 2043f4ce1299STrond Myklebust trace_nfs_writeback_inode_exit(inode, ret); 2044f4ce1299STrond Myklebust return ret; 20451c75950bSTrond Myklebust } 2046ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_wb_all); 20471c75950bSTrond Myklebust 20486d740c76SMatthew Wilcox (Oracle) int nfs_wb_folio_cancel(struct inode *inode, struct folio *folio) 20491b3b4a1aSTrond Myklebust { 20501b3b4a1aSTrond Myklebust struct nfs_page *req; 20511b3b4a1aSTrond Myklebust int ret = 0; 20521b3b4a1aSTrond Myklebust 20536d740c76SMatthew Wilcox (Oracle) folio_wait_writeback(folio); 20543e217045SWeston Andros Adamson 20553e217045SWeston Andros Adamson /* blocking call to cancel all requests and join to a single (head) 20563e217045SWeston Andros Adamson * request */ 20576d740c76SMatthew Wilcox (Oracle) req = nfs_lock_and_join_requests(&folio->page); 20583e217045SWeston Andros Adamson 20593e217045SWeston Andros Adamson if (IS_ERR(req)) { 20603e217045SWeston Andros Adamson ret = PTR_ERR(req); 20613e217045SWeston Andros Adamson } else if (req) { 20626d740c76SMatthew Wilcox (Oracle) /* all requests from this folio have been cancelled by 20633e217045SWeston Andros Adamson * nfs_lock_and_join_requests, so just remove the head 20643e217045SWeston Andros Adamson * request from the inode / page_private pointer and 20653e217045SWeston Andros Adamson * release it */ 20661b3b4a1aSTrond Myklebust nfs_inode_remove_request(req); 20671d1afcbcSTrond Myklebust nfs_unlock_and_release_request(req); 20681b3b4a1aSTrond Myklebust } 20693e217045SWeston Andros Adamson 20701b3b4a1aSTrond Myklebust return ret; 20711b3b4a1aSTrond Myklebust } 20721b3b4a1aSTrond Myklebust 20731c75950bSTrond Myklebust /* 20741c75950bSTrond Myklebust * Write back all requests on one page - we do this before reading it. 20751c75950bSTrond Myklebust */ 2076c373fff7STrond Myklebust int nfs_wb_page(struct inode *inode, struct page *page) 20771c75950bSTrond Myklebust { 207829418aa4SMel Gorman loff_t range_start = page_file_offset(page); 207909cbfeafSKirill A. Shutemov loff_t range_end = range_start + (loff_t)(PAGE_SIZE - 1); 20807f2f12d9STrond Myklebust struct writeback_control wbc = { 20817f2f12d9STrond Myklebust .sync_mode = WB_SYNC_ALL, 20827f2f12d9STrond Myklebust .nr_to_write = 0, 20837f2f12d9STrond Myklebust .range_start = range_start, 20847f2f12d9STrond Myklebust .range_end = range_end, 20857f2f12d9STrond Myklebust }; 20867f2f12d9STrond Myklebust int ret; 20877f2f12d9STrond Myklebust 2088f4ce1299STrond Myklebust trace_nfs_writeback_page_enter(inode); 2089f4ce1299STrond Myklebust 20900522f6adSTrond Myklebust for (;;) { 2091ba8b06e6STrond Myklebust wait_on_page_writeback(page); 20927f2f12d9STrond Myklebust if (clear_page_dirty_for_io(page)) { 2093c373fff7STrond Myklebust ret = nfs_writepage_locked(page, &wbc); 20947f2f12d9STrond Myklebust if (ret < 0) 20957f2f12d9STrond Myklebust goto out_error; 20960522f6adSTrond Myklebust continue; 20977f2f12d9STrond Myklebust } 2098f4ce1299STrond Myklebust ret = 0; 20990522f6adSTrond Myklebust if (!PagePrivate(page)) 21000522f6adSTrond Myklebust break; 21010522f6adSTrond Myklebust ret = nfs_commit_inode(inode, FLUSH_SYNC); 21027f2f12d9STrond Myklebust if (ret < 0) 21037f2f12d9STrond Myklebust goto out_error; 21047f2f12d9STrond Myklebust } 21057f2f12d9STrond Myklebust out_error: 2106f4ce1299STrond Myklebust trace_nfs_writeback_page_exit(inode, ret); 21077f2f12d9STrond Myklebust return ret; 21081c75950bSTrond Myklebust } 21091c75950bSTrond Myklebust 2110074cc1deSTrond Myklebust #ifdef CONFIG_MIGRATION 21114ae84a80SMatthew Wilcox (Oracle) int nfs_migrate_folio(struct address_space *mapping, struct folio *dst, 21124ae84a80SMatthew Wilcox (Oracle) struct folio *src, enum migrate_mode mode) 2113074cc1deSTrond Myklebust { 21142da95652SJeff Layton /* 21154ae84a80SMatthew Wilcox (Oracle) * If the private flag is set, the folio is currently associated with 21162da95652SJeff Layton * an in-progress read or write request. Don't try to migrate it. 21172da95652SJeff Layton * 21182da95652SJeff Layton * FIXME: we could do this in principle, but we'll need a way to ensure 21192da95652SJeff Layton * that we can safely release the inode reference while holding 21204ae84a80SMatthew Wilcox (Oracle) * the folio lock. 21212da95652SJeff Layton */ 21224ae84a80SMatthew Wilcox (Oracle) if (folio_test_private(src)) 21232da95652SJeff Layton return -EBUSY; 2124074cc1deSTrond Myklebust 21254ae84a80SMatthew Wilcox (Oracle) if (folio_test_fscache(src)) { 212616f2f4e6SDavid Howells if (mode == MIGRATE_ASYNC) 21278c209ce7SDavid Howells return -EBUSY; 21284ae84a80SMatthew Wilcox (Oracle) folio_wait_fscache(src); 212916f2f4e6SDavid Howells } 2130074cc1deSTrond Myklebust 213154184650SMatthew Wilcox (Oracle) return migrate_folio(mapping, dst, src, mode); 2132074cc1deSTrond Myklebust } 2133074cc1deSTrond Myklebust #endif 2134074cc1deSTrond Myklebust 2135f7b422b1SDavid Howells int __init nfs_init_writepagecache(void) 21361da177e4SLinus Torvalds { 21371da177e4SLinus Torvalds nfs_wdata_cachep = kmem_cache_create("nfs_write_data", 21381e7f3a48SWeston Andros Adamson sizeof(struct nfs_pgio_header), 21391da177e4SLinus Torvalds 0, SLAB_HWCACHE_ALIGN, 214020c2df83SPaul Mundt NULL); 21411da177e4SLinus Torvalds if (nfs_wdata_cachep == NULL) 21421da177e4SLinus Torvalds return -ENOMEM; 21431da177e4SLinus Torvalds 214493d2341cSMatthew Dobson nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE, 21451da177e4SLinus Torvalds nfs_wdata_cachep); 21461da177e4SLinus Torvalds if (nfs_wdata_mempool == NULL) 21473dd4765fSJeff Layton goto out_destroy_write_cache; 21481da177e4SLinus Torvalds 21490b7c0153SFred Isaman nfs_cdata_cachep = kmem_cache_create("nfs_commit_data", 21500b7c0153SFred Isaman sizeof(struct nfs_commit_data), 21510b7c0153SFred Isaman 0, SLAB_HWCACHE_ALIGN, 21520b7c0153SFred Isaman NULL); 21530b7c0153SFred Isaman if (nfs_cdata_cachep == NULL) 21543dd4765fSJeff Layton goto out_destroy_write_mempool; 21550b7c0153SFred Isaman 215693d2341cSMatthew Dobson nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT, 21574c100210SYanchuan Nian nfs_cdata_cachep); 21581da177e4SLinus Torvalds if (nfs_commit_mempool == NULL) 21593dd4765fSJeff Layton goto out_destroy_commit_cache; 21601da177e4SLinus Torvalds 216189a09141SPeter Zijlstra /* 216289a09141SPeter Zijlstra * NFS congestion size, scale with available memory. 216389a09141SPeter Zijlstra * 216489a09141SPeter Zijlstra * 64MB: 8192k 216589a09141SPeter Zijlstra * 128MB: 11585k 216689a09141SPeter Zijlstra * 256MB: 16384k 216789a09141SPeter Zijlstra * 512MB: 23170k 216889a09141SPeter Zijlstra * 1GB: 32768k 216989a09141SPeter Zijlstra * 2GB: 46340k 217089a09141SPeter Zijlstra * 4GB: 65536k 217189a09141SPeter Zijlstra * 8GB: 92681k 217289a09141SPeter Zijlstra * 16GB: 131072k 217389a09141SPeter Zijlstra * 217489a09141SPeter Zijlstra * This allows larger machines to have larger/more transfers. 217589a09141SPeter Zijlstra * Limit the default to 256M 217689a09141SPeter Zijlstra */ 2177ca79b0c2SArun KS nfs_congestion_kb = (16*int_sqrt(totalram_pages())) << (PAGE_SHIFT-10); 217889a09141SPeter Zijlstra if (nfs_congestion_kb > 256*1024) 217989a09141SPeter Zijlstra nfs_congestion_kb = 256*1024; 218089a09141SPeter Zijlstra 21811da177e4SLinus Torvalds return 0; 21823dd4765fSJeff Layton 21833dd4765fSJeff Layton out_destroy_commit_cache: 21843dd4765fSJeff Layton kmem_cache_destroy(nfs_cdata_cachep); 21853dd4765fSJeff Layton out_destroy_write_mempool: 21863dd4765fSJeff Layton mempool_destroy(nfs_wdata_mempool); 21873dd4765fSJeff Layton out_destroy_write_cache: 21883dd4765fSJeff Layton kmem_cache_destroy(nfs_wdata_cachep); 21893dd4765fSJeff Layton return -ENOMEM; 21901da177e4SLinus Torvalds } 21911da177e4SLinus Torvalds 2192266bee88SDavid Brownell void nfs_destroy_writepagecache(void) 21931da177e4SLinus Torvalds { 21941da177e4SLinus Torvalds mempool_destroy(nfs_commit_mempool); 21953dd4765fSJeff Layton kmem_cache_destroy(nfs_cdata_cachep); 21961da177e4SLinus Torvalds mempool_destroy(nfs_wdata_mempool); 21971a1d92c1SAlexey Dobriyan kmem_cache_destroy(nfs_wdata_cachep); 21981da177e4SLinus Torvalds } 21991da177e4SLinus Torvalds 22004a0de55cSAnna Schumaker static const struct nfs_rw_ops nfs_rw_write_ops = { 22014a0de55cSAnna Schumaker .rw_alloc_header = nfs_writehdr_alloc, 22024a0de55cSAnna Schumaker .rw_free_header = nfs_writehdr_free, 22030eecb214SAnna Schumaker .rw_done = nfs_writeback_done, 22040eecb214SAnna Schumaker .rw_result = nfs_writeback_result, 22051ed26f33SAnna Schumaker .rw_initiate = nfs_initiate_write, 22064a0de55cSAnna Schumaker }; 2207