11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * linux/fs/nfs/write.c 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * Writing file data over NFS. 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * We do it like this: When a (user) process wishes to write data to an 71da177e4SLinus Torvalds * NFS file, a write request is allocated that contains the RPC task data 81da177e4SLinus Torvalds * plus some info on the page to be written, and added to the inode's 91da177e4SLinus Torvalds * write chain. If the process writes past the end of the page, an async 101da177e4SLinus Torvalds * RPC call to write the page is scheduled immediately; otherwise, the call 111da177e4SLinus Torvalds * is delayed for a few seconds. 121da177e4SLinus Torvalds * 131da177e4SLinus Torvalds * Just like readahead, no async I/O is performed if wsize < PAGE_SIZE. 141da177e4SLinus Torvalds * 151da177e4SLinus Torvalds * Write requests are kept on the inode's writeback list. Each entry in 161da177e4SLinus Torvalds * that list references the page (portion) to be written. When the 171da177e4SLinus Torvalds * cache timeout has expired, the RPC task is woken up, and tries to 181da177e4SLinus Torvalds * lock the page. As soon as it manages to do so, the request is moved 191da177e4SLinus Torvalds * from the writeback list to the writelock list. 201da177e4SLinus Torvalds * 211da177e4SLinus Torvalds * Note: we must make sure never to confuse the inode passed in the 221da177e4SLinus Torvalds * write_page request with the one in page->inode. As far as I understand 231da177e4SLinus Torvalds * it, these are different when doing a swap-out. 241da177e4SLinus Torvalds * 251da177e4SLinus Torvalds * To understand everything that goes on here and in the NFS read code, 261da177e4SLinus Torvalds * one should be aware that a page is locked in exactly one of the following 271da177e4SLinus Torvalds * cases: 281da177e4SLinus Torvalds * 291da177e4SLinus Torvalds * - A write request is in progress. 301da177e4SLinus Torvalds * - A user process is in generic_file_write/nfs_update_page 311da177e4SLinus Torvalds * - A user process is in generic_file_read 321da177e4SLinus Torvalds * 331da177e4SLinus Torvalds * Also note that because of the way pages are invalidated in 341da177e4SLinus Torvalds * nfs_revalidate_inode, the following assertions hold: 351da177e4SLinus Torvalds * 361da177e4SLinus Torvalds * - If a page is dirty, there will be no read requests (a page will 371da177e4SLinus Torvalds * not be re-read unless invalidated by nfs_revalidate_inode). 381da177e4SLinus Torvalds * - If the page is not uptodate, there will be no pending write 391da177e4SLinus Torvalds * requests, and no process will be in nfs_update_page. 401da177e4SLinus Torvalds * 411da177e4SLinus Torvalds * FIXME: Interaction with the vmscan routines is not optimal yet. 421da177e4SLinus Torvalds * Either vmscan must be made nfs-savvy, or we need a different page 431da177e4SLinus Torvalds * reclaim concept that supports something like FS-independent 441da177e4SLinus Torvalds * buffer_heads with a b_ops-> field. 451da177e4SLinus Torvalds * 461da177e4SLinus Torvalds * Copyright (C) 1996, 1997, Olaf Kirch <okir@monad.swb.de> 471da177e4SLinus Torvalds */ 481da177e4SLinus Torvalds 491da177e4SLinus Torvalds #include <linux/types.h> 501da177e4SLinus Torvalds #include <linux/slab.h> 511da177e4SLinus Torvalds #include <linux/mm.h> 521da177e4SLinus Torvalds #include <linux/pagemap.h> 531da177e4SLinus Torvalds #include <linux/file.h> 541da177e4SLinus Torvalds #include <linux/writeback.h> 551da177e4SLinus Torvalds 561da177e4SLinus Torvalds #include <linux/sunrpc/clnt.h> 571da177e4SLinus Torvalds #include <linux/nfs_fs.h> 581da177e4SLinus Torvalds #include <linux/nfs_mount.h> 591da177e4SLinus Torvalds #include <linux/nfs_page.h> 603fcfab16SAndrew Morton #include <linux/backing-dev.h> 613fcfab16SAndrew Morton 621da177e4SLinus Torvalds #include <asm/uaccess.h> 631da177e4SLinus Torvalds #include <linux/smp_lock.h> 641da177e4SLinus Torvalds 651da177e4SLinus Torvalds #include "delegation.h" 6649a70f27STrond Myklebust #include "internal.h" 6791d5b470SChuck Lever #include "iostat.h" 681da177e4SLinus Torvalds 691da177e4SLinus Torvalds #define NFSDBG_FACILITY NFSDBG_PAGECACHE 701da177e4SLinus Torvalds 711da177e4SLinus Torvalds #define MIN_POOL_WRITE (32) 721da177e4SLinus Torvalds #define MIN_POOL_COMMIT (4) 731da177e4SLinus Torvalds 741da177e4SLinus Torvalds /* 751da177e4SLinus Torvalds * Local function declarations 761da177e4SLinus Torvalds */ 771da177e4SLinus Torvalds static struct nfs_page * nfs_update_request(struct nfs_open_context*, 781da177e4SLinus Torvalds struct page *, 791da177e4SLinus Torvalds unsigned int, unsigned int); 801da177e4SLinus Torvalds static int nfs_wait_on_write_congestion(struct address_space *, int); 811da177e4SLinus Torvalds static int nfs_wait_on_requests(struct inode *, unsigned long, unsigned int); 823f442547STrond Myklebust static long nfs_flush_mapping(struct address_space *mapping, struct writeback_control *wbc, int how); 831c75950bSTrond Myklebust static int nfs_wb_page_priority(struct inode *inode, struct page *page, int how); 84788e7a89STrond Myklebust static const struct rpc_call_ops nfs_write_partial_ops; 85788e7a89STrond Myklebust static const struct rpc_call_ops nfs_write_full_ops; 86788e7a89STrond Myklebust static const struct rpc_call_ops nfs_commit_ops; 871da177e4SLinus Torvalds 881da177e4SLinus Torvalds static kmem_cache_t *nfs_wdata_cachep; 893feb2d49STrond Myklebust static mempool_t *nfs_wdata_mempool; 901da177e4SLinus Torvalds static mempool_t *nfs_commit_mempool; 911da177e4SLinus Torvalds 921da177e4SLinus Torvalds static DECLARE_WAIT_QUEUE_HEAD(nfs_write_congestion); 931da177e4SLinus Torvalds 94e9f7bee1STrond Myklebust struct nfs_write_data *nfs_commit_alloc(void) 951da177e4SLinus Torvalds { 961da177e4SLinus Torvalds struct nfs_write_data *p = mempool_alloc(nfs_commit_mempool, SLAB_NOFS); 9740859d7eSChuck Lever 981da177e4SLinus Torvalds if (p) { 991da177e4SLinus Torvalds memset(p, 0, sizeof(*p)); 1001da177e4SLinus Torvalds INIT_LIST_HEAD(&p->pages); 1011da177e4SLinus Torvalds } 1021da177e4SLinus Torvalds return p; 1031da177e4SLinus Torvalds } 1041da177e4SLinus Torvalds 1058aca67f0STrond Myklebust void nfs_commit_rcu_free(struct rcu_head *head) 1061da177e4SLinus Torvalds { 1078aca67f0STrond Myklebust struct nfs_write_data *p = container_of(head, struct nfs_write_data, task.u.tk_rcu); 10840859d7eSChuck Lever if (p && (p->pagevec != &p->page_array[0])) 10940859d7eSChuck Lever kfree(p->pagevec); 1101da177e4SLinus Torvalds mempool_free(p, nfs_commit_mempool); 1111da177e4SLinus Torvalds } 1121da177e4SLinus Torvalds 1138aca67f0STrond Myklebust void nfs_commit_free(struct nfs_write_data *wdata) 1148aca67f0STrond Myklebust { 1158aca67f0STrond Myklebust call_rcu_bh(&wdata->task.u.tk_rcu, nfs_commit_rcu_free); 1168aca67f0STrond Myklebust } 1178aca67f0STrond Myklebust 118e9f7bee1STrond Myklebust struct nfs_write_data *nfs_writedata_alloc(size_t len) 1193feb2d49STrond Myklebust { 120e9f7bee1STrond Myklebust unsigned int pagecount = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; 1213feb2d49STrond Myklebust struct nfs_write_data *p = mempool_alloc(nfs_wdata_mempool, SLAB_NOFS); 1223feb2d49STrond Myklebust 1233feb2d49STrond Myklebust if (p) { 1243feb2d49STrond Myklebust memset(p, 0, sizeof(*p)); 1253feb2d49STrond Myklebust INIT_LIST_HEAD(&p->pages); 126e9f7bee1STrond Myklebust p->npages = pagecount; 1270d0b5cb3SChuck Lever if (pagecount <= ARRAY_SIZE(p->page_array)) 1280d0b5cb3SChuck Lever p->pagevec = p->page_array; 1293feb2d49STrond Myklebust else { 1300d0b5cb3SChuck Lever p->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_NOFS); 1310d0b5cb3SChuck Lever if (!p->pagevec) { 1323feb2d49STrond Myklebust mempool_free(p, nfs_wdata_mempool); 1333feb2d49STrond Myklebust p = NULL; 1343feb2d49STrond Myklebust } 1353feb2d49STrond Myklebust } 1363feb2d49STrond Myklebust } 1373feb2d49STrond Myklebust return p; 1383feb2d49STrond Myklebust } 1393feb2d49STrond Myklebust 1408aca67f0STrond Myklebust static void nfs_writedata_rcu_free(struct rcu_head *head) 1413feb2d49STrond Myklebust { 1428aca67f0STrond Myklebust struct nfs_write_data *p = container_of(head, struct nfs_write_data, task.u.tk_rcu); 1433feb2d49STrond Myklebust if (p && (p->pagevec != &p->page_array[0])) 1443feb2d49STrond Myklebust kfree(p->pagevec); 1453feb2d49STrond Myklebust mempool_free(p, nfs_wdata_mempool); 1463feb2d49STrond Myklebust } 1473feb2d49STrond Myklebust 1488aca67f0STrond Myklebust static void nfs_writedata_free(struct nfs_write_data *wdata) 1498aca67f0STrond Myklebust { 1508aca67f0STrond Myklebust call_rcu_bh(&wdata->task.u.tk_rcu, nfs_writedata_rcu_free); 1518aca67f0STrond Myklebust } 1528aca67f0STrond Myklebust 153963d8fe5STrond Myklebust void nfs_writedata_release(void *wdata) 1541da177e4SLinus Torvalds { 1551da177e4SLinus Torvalds nfs_writedata_free(wdata); 1561da177e4SLinus Torvalds } 1571da177e4SLinus Torvalds 158277459d2STrond Myklebust static struct nfs_page *nfs_page_find_request_locked(struct page *page) 159277459d2STrond Myklebust { 160277459d2STrond Myklebust struct nfs_page *req = NULL; 161277459d2STrond Myklebust 162277459d2STrond Myklebust if (PagePrivate(page)) { 163277459d2STrond Myklebust req = (struct nfs_page *)page_private(page); 164277459d2STrond Myklebust if (req != NULL) 165277459d2STrond Myklebust atomic_inc(&req->wb_count); 166277459d2STrond Myklebust } 167277459d2STrond Myklebust return req; 168277459d2STrond Myklebust } 169277459d2STrond Myklebust 170277459d2STrond Myklebust static struct nfs_page *nfs_page_find_request(struct page *page) 171277459d2STrond Myklebust { 172277459d2STrond Myklebust struct nfs_page *req = NULL; 173277459d2STrond Myklebust spinlock_t *req_lock = &NFS_I(page->mapping->host)->req_lock; 174277459d2STrond Myklebust 175277459d2STrond Myklebust spin_lock(req_lock); 176277459d2STrond Myklebust req = nfs_page_find_request_locked(page); 177277459d2STrond Myklebust spin_unlock(req_lock); 178277459d2STrond Myklebust return req; 179277459d2STrond Myklebust } 180277459d2STrond Myklebust 1811da177e4SLinus Torvalds /* Adjust the file length if we're writing beyond the end */ 1821da177e4SLinus Torvalds static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int count) 1831da177e4SLinus Torvalds { 1841da177e4SLinus Torvalds struct inode *inode = page->mapping->host; 1851da177e4SLinus Torvalds loff_t end, i_size = i_size_read(inode); 1861da177e4SLinus Torvalds unsigned long end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; 1871da177e4SLinus Torvalds 1881da177e4SLinus Torvalds if (i_size > 0 && page->index < end_index) 1891da177e4SLinus Torvalds return; 1901da177e4SLinus Torvalds end = ((loff_t)page->index << PAGE_CACHE_SHIFT) + ((loff_t)offset+count); 1911da177e4SLinus Torvalds if (i_size >= end) 1921da177e4SLinus Torvalds return; 19391d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_EXTENDWRITE); 1941da177e4SLinus Torvalds i_size_write(inode, end); 1951da177e4SLinus Torvalds } 1961da177e4SLinus Torvalds 1971da177e4SLinus Torvalds /* We can set the PG_uptodate flag if we see that a write request 1981da177e4SLinus Torvalds * covers the full page. 1991da177e4SLinus Torvalds */ 2001da177e4SLinus Torvalds static void nfs_mark_uptodate(struct page *page, unsigned int base, unsigned int count) 2011da177e4SLinus Torvalds { 2021da177e4SLinus Torvalds if (PageUptodate(page)) 2031da177e4SLinus Torvalds return; 2041da177e4SLinus Torvalds if (base != 0) 2051da177e4SLinus Torvalds return; 20649a70f27STrond Myklebust if (count != nfs_page_length(page)) 2071da177e4SLinus Torvalds return; 20849a70f27STrond Myklebust if (count != PAGE_CACHE_SIZE) 2091da177e4SLinus Torvalds memclear_highpage_flush(page, count, PAGE_CACHE_SIZE - count); 2101da177e4SLinus Torvalds SetPageUptodate(page); 2111da177e4SLinus Torvalds } 2121da177e4SLinus Torvalds 213e21195a7STrond Myklebust static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page, 2141da177e4SLinus Torvalds unsigned int offset, unsigned int count) 2151da177e4SLinus Torvalds { 2161da177e4SLinus Torvalds struct nfs_page *req; 217e21195a7STrond Myklebust int ret; 2181da177e4SLinus Torvalds 219e21195a7STrond Myklebust for (;;) { 220e21195a7STrond Myklebust req = nfs_update_request(ctx, page, offset, count); 221e21195a7STrond Myklebust if (!IS_ERR(req)) 222e21195a7STrond Myklebust break; 223e21195a7STrond Myklebust ret = PTR_ERR(req); 224e21195a7STrond Myklebust if (ret != -EBUSY) 225e21195a7STrond Myklebust return ret; 226e21195a7STrond Myklebust ret = nfs_wb_page(page->mapping->host, page); 227e21195a7STrond Myklebust if (ret != 0) 228e21195a7STrond Myklebust return ret; 229e21195a7STrond Myklebust } 2301da177e4SLinus Torvalds /* Update file length */ 2311da177e4SLinus Torvalds nfs_grow_file(page, offset, count); 2321da177e4SLinus Torvalds /* Set the PG_uptodate flag? */ 2331da177e4SLinus Torvalds nfs_mark_uptodate(page, offset, count); 2341da177e4SLinus Torvalds nfs_unlock_request(req); 235abd3e641STrond Myklebust return 0; 2361da177e4SLinus Torvalds } 2371da177e4SLinus Torvalds 2381da177e4SLinus Torvalds static int wb_priority(struct writeback_control *wbc) 2391da177e4SLinus Torvalds { 2401da177e4SLinus Torvalds if (wbc->for_reclaim) 2411da177e4SLinus Torvalds return FLUSH_HIGHPRI; 2421da177e4SLinus Torvalds if (wbc->for_kupdate) 2431da177e4SLinus Torvalds return FLUSH_LOWPRI; 2441da177e4SLinus Torvalds return 0; 2451da177e4SLinus Torvalds } 2461da177e4SLinus Torvalds 2471da177e4SLinus Torvalds /* 2481da177e4SLinus Torvalds * Write an mmapped page to the server. 2491da177e4SLinus Torvalds */ 2501da177e4SLinus Torvalds int nfs_writepage(struct page *page, struct writeback_control *wbc) 2511da177e4SLinus Torvalds { 2521da177e4SLinus Torvalds struct nfs_open_context *ctx; 2531da177e4SLinus Torvalds struct inode *inode = page->mapping->host; 254*1a54533eSTrond Myklebust struct nfs_page *req; 25549a70f27STrond Myklebust unsigned offset; 256*1a54533eSTrond Myklebust int err = 0; 2571da177e4SLinus Torvalds 25891d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE); 25991d5b470SChuck Lever nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1); 26091d5b470SChuck Lever 261*1a54533eSTrond Myklebust req = nfs_page_find_request(page); 262*1a54533eSTrond Myklebust if (req != NULL) { 263*1a54533eSTrond Myklebust int flushme = test_bit(PG_NEED_FLUSH, &req->wb_flags); 264*1a54533eSTrond Myklebust nfs_release_request(req); 265*1a54533eSTrond Myklebust if (!flushme) 266*1a54533eSTrond Myklebust goto out; 267*1a54533eSTrond Myklebust /* Ensure we've flushed out the invalid write */ 268e21195a7STrond Myklebust nfs_wb_page_priority(inode, page, wb_priority(wbc)); 269*1a54533eSTrond Myklebust } 2701da177e4SLinus Torvalds 27149a70f27STrond Myklebust offset = nfs_page_length(page); 27249a70f27STrond Myklebust if (!offset) 2731da177e4SLinus Torvalds goto out; 27449a70f27STrond Myklebust 275d530838bSTrond Myklebust ctx = nfs_find_open_context(inode, NULL, FMODE_WRITE); 2761da177e4SLinus Torvalds if (ctx == NULL) { 2771da177e4SLinus Torvalds err = -EBADF; 2781da177e4SLinus Torvalds goto out; 2791da177e4SLinus Torvalds } 280e21195a7STrond Myklebust err = nfs_writepage_setup(ctx, page, 0, offset); 281200baa21STrond Myklebust put_nfs_open_context(ctx); 282200baa21STrond Myklebust 283200baa21STrond Myklebust out: 284abd3e641STrond Myklebust if (!wbc->for_writepages) 28528c6925fSTrond Myklebust nfs_flush_mapping(page->mapping, wbc, wb_priority(wbc)); 2861da177e4SLinus Torvalds unlock_page(page); 2871da177e4SLinus Torvalds return err; 2881da177e4SLinus Torvalds } 2891da177e4SLinus Torvalds 2901da177e4SLinus Torvalds /* 2911da177e4SLinus Torvalds * Note: causes nfs_update_request() to block on the assumption 2921da177e4SLinus Torvalds * that the writeback is generated due to memory pressure. 2931da177e4SLinus Torvalds */ 2941da177e4SLinus Torvalds int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc) 2951da177e4SLinus Torvalds { 2961da177e4SLinus Torvalds struct backing_dev_info *bdi = mapping->backing_dev_info; 2971da177e4SLinus Torvalds struct inode *inode = mapping->host; 2981da177e4SLinus Torvalds int err; 2991da177e4SLinus Torvalds 30091d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES); 30191d5b470SChuck Lever 3021da177e4SLinus Torvalds err = generic_writepages(mapping, wbc); 3031da177e4SLinus Torvalds if (err) 3041da177e4SLinus Torvalds return err; 3051da177e4SLinus Torvalds while (test_and_set_bit(BDI_write_congested, &bdi->state) != 0) { 3061da177e4SLinus Torvalds if (wbc->nonblocking) 3071da177e4SLinus Torvalds return 0; 3081da177e4SLinus Torvalds nfs_wait_on_write_congestion(mapping, 0); 3091da177e4SLinus Torvalds } 31028c6925fSTrond Myklebust err = nfs_flush_mapping(mapping, wbc, wb_priority(wbc)); 3111da177e4SLinus Torvalds if (err < 0) 3121da177e4SLinus Torvalds goto out; 31391d5b470SChuck Lever nfs_add_stats(inode, NFSIOS_WRITEPAGES, err); 3141da177e4SLinus Torvalds if (!wbc->nonblocking && wbc->sync_mode == WB_SYNC_ALL) { 3151da177e4SLinus Torvalds err = nfs_wait_on_requests(inode, 0, 0); 3161da177e4SLinus Torvalds if (err < 0) 3171da177e4SLinus Torvalds goto out; 3181da177e4SLinus Torvalds } 3193da28eb1STrond Myklebust err = nfs_commit_inode(inode, wb_priority(wbc)); 3203f442547STrond Myklebust if (err > 0) 3211da177e4SLinus Torvalds err = 0; 3221da177e4SLinus Torvalds out: 3231da177e4SLinus Torvalds clear_bit(BDI_write_congested, &bdi->state); 3241da177e4SLinus Torvalds wake_up_all(&nfs_write_congestion); 3253fcfab16SAndrew Morton congestion_end(WRITE); 3261da177e4SLinus Torvalds return err; 3271da177e4SLinus Torvalds } 3281da177e4SLinus Torvalds 3291da177e4SLinus Torvalds /* 3301da177e4SLinus Torvalds * Insert a write request into an inode 3311da177e4SLinus Torvalds */ 3321da177e4SLinus Torvalds static int nfs_inode_add_request(struct inode *inode, struct nfs_page *req) 3331da177e4SLinus Torvalds { 3341da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 3351da177e4SLinus Torvalds int error; 3361da177e4SLinus Torvalds 3371da177e4SLinus Torvalds error = radix_tree_insert(&nfsi->nfs_page_tree, req->wb_index, req); 3381da177e4SLinus Torvalds BUG_ON(error == -EEXIST); 3391da177e4SLinus Torvalds if (error) 3401da177e4SLinus Torvalds return error; 3411da177e4SLinus Torvalds if (!nfsi->npages) { 3421da177e4SLinus Torvalds igrab(inode); 3431da177e4SLinus Torvalds nfs_begin_data_update(inode); 3441da177e4SLinus Torvalds if (nfs_have_delegation(inode, FMODE_WRITE)) 3451da177e4SLinus Torvalds nfsi->change_attr++; 3461da177e4SLinus Torvalds } 347deb7d638STrond Myklebust SetPagePrivate(req->wb_page); 348277459d2STrond Myklebust set_page_private(req->wb_page, (unsigned long)req); 3491da177e4SLinus Torvalds nfsi->npages++; 3501da177e4SLinus Torvalds atomic_inc(&req->wb_count); 3511da177e4SLinus Torvalds return 0; 3521da177e4SLinus Torvalds } 3531da177e4SLinus Torvalds 3541da177e4SLinus Torvalds /* 3551da177e4SLinus Torvalds * Insert a write request into an inode 3561da177e4SLinus Torvalds */ 3571da177e4SLinus Torvalds static void nfs_inode_remove_request(struct nfs_page *req) 3581da177e4SLinus Torvalds { 3591da177e4SLinus Torvalds struct inode *inode = req->wb_context->dentry->d_inode; 3601da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 3611da177e4SLinus Torvalds 3621da177e4SLinus Torvalds BUG_ON (!NFS_WBACK_BUSY(req)); 3631da177e4SLinus Torvalds 3641da177e4SLinus Torvalds spin_lock(&nfsi->req_lock); 365277459d2STrond Myklebust set_page_private(req->wb_page, 0); 366deb7d638STrond Myklebust ClearPagePrivate(req->wb_page); 3671da177e4SLinus Torvalds radix_tree_delete(&nfsi->nfs_page_tree, req->wb_index); 3681da177e4SLinus Torvalds nfsi->npages--; 3691da177e4SLinus Torvalds if (!nfsi->npages) { 3701da177e4SLinus Torvalds spin_unlock(&nfsi->req_lock); 371951a143bSTrond Myklebust nfs_end_data_update(inode); 3721da177e4SLinus Torvalds iput(inode); 3731da177e4SLinus Torvalds } else 3741da177e4SLinus Torvalds spin_unlock(&nfsi->req_lock); 3751da177e4SLinus Torvalds nfs_clear_request(req); 3761da177e4SLinus Torvalds nfs_release_request(req); 3771da177e4SLinus Torvalds } 3781da177e4SLinus Torvalds 3791da177e4SLinus Torvalds /* 3801da177e4SLinus Torvalds * Add a request to the inode's dirty list. 3811da177e4SLinus Torvalds */ 3821da177e4SLinus Torvalds static void 3831da177e4SLinus Torvalds nfs_mark_request_dirty(struct nfs_page *req) 3841da177e4SLinus Torvalds { 3851da177e4SLinus Torvalds struct inode *inode = req->wb_context->dentry->d_inode; 3861da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 3871da177e4SLinus Torvalds 3881da177e4SLinus Torvalds spin_lock(&nfsi->req_lock); 3893da28eb1STrond Myklebust radix_tree_tag_set(&nfsi->nfs_page_tree, 3903da28eb1STrond Myklebust req->wb_index, NFS_PAGE_TAG_DIRTY); 3911da177e4SLinus Torvalds nfs_list_add_request(req, &nfsi->dirty); 3921da177e4SLinus Torvalds nfsi->ndirty++; 3931da177e4SLinus Torvalds spin_unlock(&nfsi->req_lock); 394b1e7a8fdSChristoph Lameter inc_zone_page_state(req->wb_page, NR_FILE_DIRTY); 3951da177e4SLinus Torvalds mark_inode_dirty(inode); 3961da177e4SLinus Torvalds } 3971da177e4SLinus Torvalds 3981da177e4SLinus Torvalds /* 3991da177e4SLinus Torvalds * Check if a request is dirty 4001da177e4SLinus Torvalds */ 4011da177e4SLinus Torvalds static inline int 4021da177e4SLinus Torvalds nfs_dirty_request(struct nfs_page *req) 4031da177e4SLinus Torvalds { 4041da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(req->wb_context->dentry->d_inode); 4051da177e4SLinus Torvalds return !list_empty(&req->wb_list) && req->wb_list_head == &nfsi->dirty; 4061da177e4SLinus Torvalds } 4071da177e4SLinus Torvalds 4081da177e4SLinus Torvalds #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) 4091da177e4SLinus Torvalds /* 4101da177e4SLinus Torvalds * Add a request to the inode's commit list. 4111da177e4SLinus Torvalds */ 4121da177e4SLinus Torvalds static void 4131da177e4SLinus Torvalds nfs_mark_request_commit(struct nfs_page *req) 4141da177e4SLinus Torvalds { 4151da177e4SLinus Torvalds struct inode *inode = req->wb_context->dentry->d_inode; 4161da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 4171da177e4SLinus Torvalds 4181da177e4SLinus Torvalds spin_lock(&nfsi->req_lock); 4191da177e4SLinus Torvalds nfs_list_add_request(req, &nfsi->commit); 4201da177e4SLinus Torvalds nfsi->ncommit++; 4211da177e4SLinus Torvalds spin_unlock(&nfsi->req_lock); 422fd39fc85SChristoph Lameter inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); 4231da177e4SLinus Torvalds mark_inode_dirty(inode); 4241da177e4SLinus Torvalds } 4251da177e4SLinus Torvalds #endif 4261da177e4SLinus Torvalds 4271da177e4SLinus Torvalds /* 4281da177e4SLinus Torvalds * Wait for a request to complete. 4291da177e4SLinus Torvalds * 4301da177e4SLinus Torvalds * Interruptible by signals only if mounted with intr flag. 4311da177e4SLinus Torvalds */ 432c42de9ddSTrond Myklebust static int nfs_wait_on_requests_locked(struct inode *inode, unsigned long idx_start, unsigned int npages) 4331da177e4SLinus Torvalds { 4341da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 4351da177e4SLinus Torvalds struct nfs_page *req; 4361da177e4SLinus Torvalds unsigned long idx_end, next; 4371da177e4SLinus Torvalds unsigned int res = 0; 4381da177e4SLinus Torvalds int error; 4391da177e4SLinus Torvalds 4401da177e4SLinus Torvalds if (npages == 0) 4411da177e4SLinus Torvalds idx_end = ~0; 4421da177e4SLinus Torvalds else 4431da177e4SLinus Torvalds idx_end = idx_start + npages - 1; 4441da177e4SLinus Torvalds 4451da177e4SLinus Torvalds next = idx_start; 446c6a556b8STrond Myklebust while (radix_tree_gang_lookup_tag(&nfsi->nfs_page_tree, (void **)&req, next, 1, NFS_PAGE_TAG_WRITEBACK)) { 4471da177e4SLinus Torvalds if (req->wb_index > idx_end) 4481da177e4SLinus Torvalds break; 4491da177e4SLinus Torvalds 4501da177e4SLinus Torvalds next = req->wb_index + 1; 451c6a556b8STrond Myklebust BUG_ON(!NFS_WBACK_BUSY(req)); 4521da177e4SLinus Torvalds 4531da177e4SLinus Torvalds atomic_inc(&req->wb_count); 4541da177e4SLinus Torvalds spin_unlock(&nfsi->req_lock); 4551da177e4SLinus Torvalds error = nfs_wait_on_request(req); 4561da177e4SLinus Torvalds nfs_release_request(req); 457c42de9ddSTrond Myklebust spin_lock(&nfsi->req_lock); 4581da177e4SLinus Torvalds if (error < 0) 4591da177e4SLinus Torvalds return error; 4601da177e4SLinus Torvalds res++; 4611da177e4SLinus Torvalds } 4621da177e4SLinus Torvalds return res; 4631da177e4SLinus Torvalds } 4641da177e4SLinus Torvalds 465c42de9ddSTrond Myklebust static int nfs_wait_on_requests(struct inode *inode, unsigned long idx_start, unsigned int npages) 466c42de9ddSTrond Myklebust { 467c42de9ddSTrond Myklebust struct nfs_inode *nfsi = NFS_I(inode); 468c42de9ddSTrond Myklebust int ret; 469c42de9ddSTrond Myklebust 470c42de9ddSTrond Myklebust spin_lock(&nfsi->req_lock); 471c42de9ddSTrond Myklebust ret = nfs_wait_on_requests_locked(inode, idx_start, npages); 472c42de9ddSTrond Myklebust spin_unlock(&nfsi->req_lock); 473c42de9ddSTrond Myklebust return ret; 474c42de9ddSTrond Myklebust } 475c42de9ddSTrond Myklebust 47683715ad5STrond Myklebust static void nfs_cancel_dirty_list(struct list_head *head) 477d2ccddf0STrond Myklebust { 478d2ccddf0STrond Myklebust struct nfs_page *req; 479d2ccddf0STrond Myklebust while(!list_empty(head)) { 480d2ccddf0STrond Myklebust req = nfs_list_entry(head->next); 481d2ccddf0STrond Myklebust nfs_list_remove_request(req); 482d2ccddf0STrond Myklebust nfs_inode_remove_request(req); 483d2ccddf0STrond Myklebust nfs_clear_page_writeback(req); 484d2ccddf0STrond Myklebust } 485d2ccddf0STrond Myklebust } 486d2ccddf0STrond Myklebust 48783715ad5STrond Myklebust static void nfs_cancel_commit_list(struct list_head *head) 48883715ad5STrond Myklebust { 48983715ad5STrond Myklebust struct nfs_page *req; 49083715ad5STrond Myklebust 49183715ad5STrond Myklebust while(!list_empty(head)) { 49283715ad5STrond Myklebust req = nfs_list_entry(head->next); 493b6dff26aSTrond Myklebust dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); 49483715ad5STrond Myklebust nfs_list_remove_request(req); 49583715ad5STrond Myklebust nfs_inode_remove_request(req); 496b6dff26aSTrond Myklebust nfs_unlock_request(req); 49783715ad5STrond Myklebust } 49883715ad5STrond Myklebust } 49983715ad5STrond Myklebust 5001da177e4SLinus Torvalds #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) 5011da177e4SLinus Torvalds /* 5021da177e4SLinus Torvalds * nfs_scan_commit - Scan an inode for commit requests 5031da177e4SLinus Torvalds * @inode: NFS inode to scan 5041da177e4SLinus Torvalds * @dst: destination list 5051da177e4SLinus Torvalds * @idx_start: lower bound of page->index to scan. 5061da177e4SLinus Torvalds * @npages: idx_start + npages sets the upper bound to scan. 5071da177e4SLinus Torvalds * 5081da177e4SLinus Torvalds * Moves requests from the inode's 'commit' request list. 5091da177e4SLinus Torvalds * The requests are *not* checked to ensure that they form a contiguous set. 5101da177e4SLinus Torvalds */ 5111da177e4SLinus Torvalds static int 5121da177e4SLinus Torvalds nfs_scan_commit(struct inode *inode, struct list_head *dst, unsigned long idx_start, unsigned int npages) 5131da177e4SLinus Torvalds { 5141da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 5153da28eb1STrond Myklebust int res = 0; 5163da28eb1STrond Myklebust 5173da28eb1STrond Myklebust if (nfsi->ncommit != 0) { 518d2ccddf0STrond Myklebust res = nfs_scan_list(nfsi, &nfsi->commit, dst, idx_start, npages); 5191da177e4SLinus Torvalds nfsi->ncommit -= res; 5201da177e4SLinus Torvalds if ((nfsi->ncommit == 0) != list_empty(&nfsi->commit)) 5211da177e4SLinus Torvalds printk(KERN_ERR "NFS: desynchronized value of nfs_i.ncommit.\n"); 5223da28eb1STrond Myklebust } 5231da177e4SLinus Torvalds return res; 5241da177e4SLinus Torvalds } 525c42de9ddSTrond Myklebust #else 526c42de9ddSTrond Myklebust static inline int nfs_scan_commit(struct inode *inode, struct list_head *dst, unsigned long idx_start, unsigned int npages) 527c42de9ddSTrond Myklebust { 528c42de9ddSTrond Myklebust return 0; 529c42de9ddSTrond Myklebust } 5301da177e4SLinus Torvalds #endif 5311da177e4SLinus Torvalds 5321da177e4SLinus Torvalds static int nfs_wait_on_write_congestion(struct address_space *mapping, int intr) 5331da177e4SLinus Torvalds { 5341da177e4SLinus Torvalds struct backing_dev_info *bdi = mapping->backing_dev_info; 5351da177e4SLinus Torvalds DEFINE_WAIT(wait); 5361da177e4SLinus Torvalds int ret = 0; 5371da177e4SLinus Torvalds 5381da177e4SLinus Torvalds might_sleep(); 5391da177e4SLinus Torvalds 5401da177e4SLinus Torvalds if (!bdi_write_congested(bdi)) 5411da177e4SLinus Torvalds return 0; 54291d5b470SChuck Lever 54391d5b470SChuck Lever nfs_inc_stats(mapping->host, NFSIOS_CONGESTIONWAIT); 54491d5b470SChuck Lever 5451da177e4SLinus Torvalds if (intr) { 5461da177e4SLinus Torvalds struct rpc_clnt *clnt = NFS_CLIENT(mapping->host); 5471da177e4SLinus Torvalds sigset_t oldset; 5481da177e4SLinus Torvalds 5491da177e4SLinus Torvalds rpc_clnt_sigmask(clnt, &oldset); 5501da177e4SLinus Torvalds prepare_to_wait(&nfs_write_congestion, &wait, TASK_INTERRUPTIBLE); 5511da177e4SLinus Torvalds if (bdi_write_congested(bdi)) { 5521da177e4SLinus Torvalds if (signalled()) 5531da177e4SLinus Torvalds ret = -ERESTARTSYS; 5541da177e4SLinus Torvalds else 5551da177e4SLinus Torvalds schedule(); 5561da177e4SLinus Torvalds } 5571da177e4SLinus Torvalds rpc_clnt_sigunmask(clnt, &oldset); 5581da177e4SLinus Torvalds } else { 5591da177e4SLinus Torvalds prepare_to_wait(&nfs_write_congestion, &wait, TASK_UNINTERRUPTIBLE); 5601da177e4SLinus Torvalds if (bdi_write_congested(bdi)) 5611da177e4SLinus Torvalds schedule(); 5621da177e4SLinus Torvalds } 5631da177e4SLinus Torvalds finish_wait(&nfs_write_congestion, &wait); 5641da177e4SLinus Torvalds return ret; 5651da177e4SLinus Torvalds } 5661da177e4SLinus Torvalds 5671da177e4SLinus Torvalds 5681da177e4SLinus Torvalds /* 5691da177e4SLinus Torvalds * Try to update any existing write request, or create one if there is none. 5701da177e4SLinus Torvalds * In order to match, the request's credentials must match those of 5711da177e4SLinus Torvalds * the calling process. 5721da177e4SLinus Torvalds * 5731da177e4SLinus Torvalds * Note: Should always be called with the Page Lock held! 5741da177e4SLinus Torvalds */ 5751da177e4SLinus Torvalds static struct nfs_page * nfs_update_request(struct nfs_open_context* ctx, 576e21195a7STrond Myklebust struct page *page, unsigned int offset, unsigned int bytes) 5771da177e4SLinus Torvalds { 578e21195a7STrond Myklebust struct inode *inode = page->mapping->host; 5791da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 5801da177e4SLinus Torvalds struct nfs_page *req, *new = NULL; 5811da177e4SLinus Torvalds unsigned long rqend, end; 5821da177e4SLinus Torvalds 5831da177e4SLinus Torvalds end = offset + bytes; 5841da177e4SLinus Torvalds 585e21195a7STrond Myklebust if (nfs_wait_on_write_congestion(page->mapping, NFS_SERVER(inode)->flags & NFS_MOUNT_INTR)) 5861da177e4SLinus Torvalds return ERR_PTR(-ERESTARTSYS); 5871da177e4SLinus Torvalds for (;;) { 5881da177e4SLinus Torvalds /* Loop over all inode entries and see if we find 5891da177e4SLinus Torvalds * A request for the page we wish to update 5901da177e4SLinus Torvalds */ 5911da177e4SLinus Torvalds spin_lock(&nfsi->req_lock); 592277459d2STrond Myklebust req = nfs_page_find_request_locked(page); 5931da177e4SLinus Torvalds if (req) { 5941da177e4SLinus Torvalds if (!nfs_lock_request_dontget(req)) { 5951da177e4SLinus Torvalds int error; 596277459d2STrond Myklebust 5971da177e4SLinus Torvalds spin_unlock(&nfsi->req_lock); 5981da177e4SLinus Torvalds error = nfs_wait_on_request(req); 5991da177e4SLinus Torvalds nfs_release_request(req); 6001dd594b2SNeil Brown if (error < 0) { 6011dd594b2SNeil Brown if (new) 6021dd594b2SNeil Brown nfs_release_request(new); 6031da177e4SLinus Torvalds return ERR_PTR(error); 6041dd594b2SNeil Brown } 6051da177e4SLinus Torvalds continue; 6061da177e4SLinus Torvalds } 6071da177e4SLinus Torvalds spin_unlock(&nfsi->req_lock); 6081da177e4SLinus Torvalds if (new) 6091da177e4SLinus Torvalds nfs_release_request(new); 6101da177e4SLinus Torvalds break; 6111da177e4SLinus Torvalds } 6121da177e4SLinus Torvalds 6131da177e4SLinus Torvalds if (new) { 6141da177e4SLinus Torvalds int error; 6151da177e4SLinus Torvalds nfs_lock_request_dontget(new); 6161da177e4SLinus Torvalds error = nfs_inode_add_request(inode, new); 6171da177e4SLinus Torvalds if (error) { 6181da177e4SLinus Torvalds spin_unlock(&nfsi->req_lock); 6191da177e4SLinus Torvalds nfs_unlock_request(new); 6201da177e4SLinus Torvalds return ERR_PTR(error); 6211da177e4SLinus Torvalds } 6221da177e4SLinus Torvalds spin_unlock(&nfsi->req_lock); 6231da177e4SLinus Torvalds nfs_mark_request_dirty(new); 6241da177e4SLinus Torvalds return new; 6251da177e4SLinus Torvalds } 6261da177e4SLinus Torvalds spin_unlock(&nfsi->req_lock); 6271da177e4SLinus Torvalds 6281da177e4SLinus Torvalds new = nfs_create_request(ctx, inode, page, offset, bytes); 6291da177e4SLinus Torvalds if (IS_ERR(new)) 6301da177e4SLinus Torvalds return new; 6311da177e4SLinus Torvalds } 6321da177e4SLinus Torvalds 6331da177e4SLinus Torvalds /* We have a request for our page. 6341da177e4SLinus Torvalds * If the creds don't match, or the 6351da177e4SLinus Torvalds * page addresses don't match, 6361da177e4SLinus Torvalds * tell the caller to wait on the conflicting 6371da177e4SLinus Torvalds * request. 6381da177e4SLinus Torvalds */ 6391da177e4SLinus Torvalds rqend = req->wb_offset + req->wb_bytes; 6401da177e4SLinus Torvalds if (req->wb_context != ctx 6411da177e4SLinus Torvalds || req->wb_page != page 6421da177e4SLinus Torvalds || !nfs_dirty_request(req) 6431da177e4SLinus Torvalds || offset > rqend || end < req->wb_offset) { 6441da177e4SLinus Torvalds nfs_unlock_request(req); 6451da177e4SLinus Torvalds return ERR_PTR(-EBUSY); 6461da177e4SLinus Torvalds } 6471da177e4SLinus Torvalds 6481da177e4SLinus Torvalds /* Okay, the request matches. Update the region */ 6491da177e4SLinus Torvalds if (offset < req->wb_offset) { 6501da177e4SLinus Torvalds req->wb_offset = offset; 6511da177e4SLinus Torvalds req->wb_pgbase = offset; 6521da177e4SLinus Torvalds req->wb_bytes = rqend - req->wb_offset; 6531da177e4SLinus Torvalds } 6541da177e4SLinus Torvalds 6551da177e4SLinus Torvalds if (end > rqend) 6561da177e4SLinus Torvalds req->wb_bytes = end - req->wb_offset; 6571da177e4SLinus Torvalds 6581da177e4SLinus Torvalds return req; 6591da177e4SLinus Torvalds } 6601da177e4SLinus Torvalds 6611da177e4SLinus Torvalds int nfs_flush_incompatible(struct file *file, struct page *page) 6621da177e4SLinus Torvalds { 6631da177e4SLinus Torvalds struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data; 6641da177e4SLinus Torvalds struct nfs_page *req; 665*1a54533eSTrond Myklebust int do_flush, status; 6661da177e4SLinus Torvalds /* 6671da177e4SLinus Torvalds * Look for a request corresponding to this page. If there 6681da177e4SLinus Torvalds * is one, and it belongs to another file, we flush it out 6691da177e4SLinus Torvalds * before we try to copy anything into the page. Do this 6701da177e4SLinus Torvalds * due to the lack of an ACCESS-type call in NFSv2. 6711da177e4SLinus Torvalds * Also do the same if we find a request from an existing 6721da177e4SLinus Torvalds * dropped page. 6731da177e4SLinus Torvalds */ 674*1a54533eSTrond Myklebust do { 675277459d2STrond Myklebust req = nfs_page_find_request(page); 676*1a54533eSTrond Myklebust if (req == NULL) 677*1a54533eSTrond Myklebust return 0; 678*1a54533eSTrond Myklebust do_flush = req->wb_page != page || req->wb_context != ctx 679*1a54533eSTrond Myklebust || test_bit(PG_NEED_FLUSH, &req->wb_flags); 6801da177e4SLinus Torvalds nfs_release_request(req); 681*1a54533eSTrond Myklebust if (!do_flush) 682*1a54533eSTrond Myklebust return 0; 683277459d2STrond Myklebust status = nfs_wb_page(page->mapping->host, page); 684*1a54533eSTrond Myklebust } while (status == 0); 685*1a54533eSTrond Myklebust return status; 6861da177e4SLinus Torvalds } 6871da177e4SLinus Torvalds 6881da177e4SLinus Torvalds /* 6891da177e4SLinus Torvalds * Update and possibly write a cached page of an NFS file. 6901da177e4SLinus Torvalds * 6911da177e4SLinus Torvalds * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad 6921da177e4SLinus Torvalds * things with a page scheduled for an RPC call (e.g. invalidate it). 6931da177e4SLinus Torvalds */ 6941da177e4SLinus Torvalds int nfs_updatepage(struct file *file, struct page *page, 6951da177e4SLinus Torvalds unsigned int offset, unsigned int count) 6961da177e4SLinus Torvalds { 6971da177e4SLinus Torvalds struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data; 6981da177e4SLinus Torvalds struct inode *inode = page->mapping->host; 6991da177e4SLinus Torvalds int status = 0; 7001da177e4SLinus Torvalds 70191d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE); 70291d5b470SChuck Lever 7031da177e4SLinus Torvalds dprintk("NFS: nfs_updatepage(%s/%s %d@%Ld)\n", 7040bbacc40SChuck Lever file->f_dentry->d_parent->d_name.name, 7050bbacc40SChuck Lever file->f_dentry->d_name.name, count, 7060bbacc40SChuck Lever (long long)(page_offset(page) +offset)); 7071da177e4SLinus Torvalds 7081da177e4SLinus Torvalds /* If we're not using byte range locks, and we know the page 7091da177e4SLinus Torvalds * is entirely in cache, it may be more efficient to avoid 7101da177e4SLinus Torvalds * fragmenting write requests. 7111da177e4SLinus Torvalds */ 712ab0a3dbeSTrond Myklebust if (PageUptodate(page) && inode->i_flock == NULL && !(file->f_mode & O_SYNC)) { 71349a70f27STrond Myklebust count = max(count + offset, nfs_page_length(page)); 7141da177e4SLinus Torvalds offset = 0; 7151da177e4SLinus Torvalds } 7161da177e4SLinus Torvalds 717e21195a7STrond Myklebust status = nfs_writepage_setup(ctx, page, offset, count); 7181da177e4SLinus Torvalds 7191da177e4SLinus Torvalds dprintk("NFS: nfs_updatepage returns %d (isize %Ld)\n", 7201da177e4SLinus Torvalds status, (long long)i_size_read(inode)); 7211da177e4SLinus Torvalds if (status < 0) 7221da177e4SLinus Torvalds ClearPageUptodate(page); 7231da177e4SLinus Torvalds return status; 7241da177e4SLinus Torvalds } 7251da177e4SLinus Torvalds 7261da177e4SLinus Torvalds static void nfs_writepage_release(struct nfs_page *req) 7271da177e4SLinus Torvalds { 7281da177e4SLinus Torvalds end_page_writeback(req->wb_page); 7291da177e4SLinus Torvalds 7301da177e4SLinus Torvalds #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) 7311da177e4SLinus Torvalds if (!PageError(req->wb_page)) { 7321da177e4SLinus Torvalds if (NFS_NEED_RESCHED(req)) { 7331da177e4SLinus Torvalds nfs_mark_request_dirty(req); 7341da177e4SLinus Torvalds goto out; 7351da177e4SLinus Torvalds } else if (NFS_NEED_COMMIT(req)) { 7361da177e4SLinus Torvalds nfs_mark_request_commit(req); 7371da177e4SLinus Torvalds goto out; 7381da177e4SLinus Torvalds } 7391da177e4SLinus Torvalds } 7401da177e4SLinus Torvalds nfs_inode_remove_request(req); 7411da177e4SLinus Torvalds 7421da177e4SLinus Torvalds out: 7431da177e4SLinus Torvalds nfs_clear_commit(req); 7441da177e4SLinus Torvalds nfs_clear_reschedule(req); 7451da177e4SLinus Torvalds #else 7461da177e4SLinus Torvalds nfs_inode_remove_request(req); 7471da177e4SLinus Torvalds #endif 748c6a556b8STrond Myklebust nfs_clear_page_writeback(req); 7491da177e4SLinus Torvalds } 7501da177e4SLinus Torvalds 7511da177e4SLinus Torvalds static inline int flush_task_priority(int how) 7521da177e4SLinus Torvalds { 7531da177e4SLinus Torvalds switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) { 7541da177e4SLinus Torvalds case FLUSH_HIGHPRI: 7551da177e4SLinus Torvalds return RPC_PRIORITY_HIGH; 7561da177e4SLinus Torvalds case FLUSH_LOWPRI: 7571da177e4SLinus Torvalds return RPC_PRIORITY_LOW; 7581da177e4SLinus Torvalds } 7591da177e4SLinus Torvalds return RPC_PRIORITY_NORMAL; 7601da177e4SLinus Torvalds } 7611da177e4SLinus Torvalds 7621da177e4SLinus Torvalds /* 7631da177e4SLinus Torvalds * Set up the argument/result storage required for the RPC call. 7641da177e4SLinus Torvalds */ 7651da177e4SLinus Torvalds static void nfs_write_rpcsetup(struct nfs_page *req, 7661da177e4SLinus Torvalds struct nfs_write_data *data, 767788e7a89STrond Myklebust const struct rpc_call_ops *call_ops, 7681da177e4SLinus Torvalds unsigned int count, unsigned int offset, 7691da177e4SLinus Torvalds int how) 7701da177e4SLinus Torvalds { 7711da177e4SLinus Torvalds struct inode *inode; 772788e7a89STrond Myklebust int flags; 7731da177e4SLinus Torvalds 7741da177e4SLinus Torvalds /* Set up the RPC argument and reply structs 7751da177e4SLinus Torvalds * NB: take care not to mess about with data->commit et al. */ 7761da177e4SLinus Torvalds 7771da177e4SLinus Torvalds data->req = req; 7781da177e4SLinus Torvalds data->inode = inode = req->wb_context->dentry->d_inode; 7791da177e4SLinus Torvalds data->cred = req->wb_context->cred; 7801da177e4SLinus Torvalds 7811da177e4SLinus Torvalds data->args.fh = NFS_FH(inode); 7821da177e4SLinus Torvalds data->args.offset = req_offset(req) + offset; 7831da177e4SLinus Torvalds data->args.pgbase = req->wb_pgbase + offset; 7841da177e4SLinus Torvalds data->args.pages = data->pagevec; 7851da177e4SLinus Torvalds data->args.count = count; 7861da177e4SLinus Torvalds data->args.context = req->wb_context; 7871da177e4SLinus Torvalds 7881da177e4SLinus Torvalds data->res.fattr = &data->fattr; 7891da177e4SLinus Torvalds data->res.count = count; 7901da177e4SLinus Torvalds data->res.verf = &data->verf; 7910e574af1STrond Myklebust nfs_fattr_init(&data->fattr); 7921da177e4SLinus Torvalds 793788e7a89STrond Myklebust /* Set up the initial task struct. */ 794788e7a89STrond Myklebust flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; 795788e7a89STrond Myklebust rpc_init_task(&data->task, NFS_CLIENT(inode), flags, call_ops, data); 7961da177e4SLinus Torvalds NFS_PROTO(inode)->write_setup(data, how); 7971da177e4SLinus Torvalds 7981da177e4SLinus Torvalds data->task.tk_priority = flush_task_priority(how); 7991da177e4SLinus Torvalds data->task.tk_cookie = (unsigned long)inode; 8001da177e4SLinus Torvalds 8011da177e4SLinus Torvalds dprintk("NFS: %4d initiated write call (req %s/%Ld, %u bytes @ offset %Lu)\n", 8020bbacc40SChuck Lever data->task.tk_pid, 8031da177e4SLinus Torvalds inode->i_sb->s_id, 8041da177e4SLinus Torvalds (long long)NFS_FILEID(inode), 8051da177e4SLinus Torvalds count, 8061da177e4SLinus Torvalds (unsigned long long)data->args.offset); 8071da177e4SLinus Torvalds } 8081da177e4SLinus Torvalds 8091da177e4SLinus Torvalds static void nfs_execute_write(struct nfs_write_data *data) 8101da177e4SLinus Torvalds { 8111da177e4SLinus Torvalds struct rpc_clnt *clnt = NFS_CLIENT(data->inode); 8121da177e4SLinus Torvalds sigset_t oldset; 8131da177e4SLinus Torvalds 8141da177e4SLinus Torvalds rpc_clnt_sigmask(clnt, &oldset); 8151da177e4SLinus Torvalds rpc_execute(&data->task); 8161da177e4SLinus Torvalds rpc_clnt_sigunmask(clnt, &oldset); 8171da177e4SLinus Torvalds } 8181da177e4SLinus Torvalds 8191da177e4SLinus Torvalds /* 8201da177e4SLinus Torvalds * Generate multiple small requests to write out a single 8211da177e4SLinus Torvalds * contiguous dirty area on one page. 8221da177e4SLinus Torvalds */ 8237d46a49fSTrond Myklebust static int nfs_flush_multi(struct inode *inode, struct list_head *head, int how) 8241da177e4SLinus Torvalds { 8251da177e4SLinus Torvalds struct nfs_page *req = nfs_list_entry(head->next); 8261da177e4SLinus Torvalds struct page *page = req->wb_page; 8271da177e4SLinus Torvalds struct nfs_write_data *data; 828e9f7bee1STrond Myklebust size_t wsize = NFS_SERVER(inode)->wsize, nbytes; 829e9f7bee1STrond Myklebust unsigned int offset; 8301da177e4SLinus Torvalds int requests = 0; 8311da177e4SLinus Torvalds LIST_HEAD(list); 8321da177e4SLinus Torvalds 8331da177e4SLinus Torvalds nfs_list_remove_request(req); 8341da177e4SLinus Torvalds 8351da177e4SLinus Torvalds nbytes = req->wb_bytes; 836e9f7bee1STrond Myklebust do { 837e9f7bee1STrond Myklebust size_t len = min(nbytes, wsize); 838e9f7bee1STrond Myklebust 839e9f7bee1STrond Myklebust data = nfs_writedata_alloc(len); 8401da177e4SLinus Torvalds if (!data) 8411da177e4SLinus Torvalds goto out_bad; 8421da177e4SLinus Torvalds list_add(&data->pages, &list); 8431da177e4SLinus Torvalds requests++; 844e9f7bee1STrond Myklebust nbytes -= len; 845e9f7bee1STrond Myklebust } while (nbytes != 0); 8461da177e4SLinus Torvalds atomic_set(&req->wb_complete, requests); 8471da177e4SLinus Torvalds 8481da177e4SLinus Torvalds ClearPageError(page); 849bb713d6dSTrond Myklebust set_page_writeback(page); 8501da177e4SLinus Torvalds offset = 0; 8511da177e4SLinus Torvalds nbytes = req->wb_bytes; 8521da177e4SLinus Torvalds do { 8531da177e4SLinus Torvalds data = list_entry(list.next, struct nfs_write_data, pages); 8541da177e4SLinus Torvalds list_del_init(&data->pages); 8551da177e4SLinus Torvalds 8561da177e4SLinus Torvalds data->pagevec[0] = page; 8571da177e4SLinus Torvalds 8581da177e4SLinus Torvalds if (nbytes > wsize) { 859788e7a89STrond Myklebust nfs_write_rpcsetup(req, data, &nfs_write_partial_ops, 860788e7a89STrond Myklebust wsize, offset, how); 8611da177e4SLinus Torvalds offset += wsize; 8621da177e4SLinus Torvalds nbytes -= wsize; 8631da177e4SLinus Torvalds } else { 864788e7a89STrond Myklebust nfs_write_rpcsetup(req, data, &nfs_write_partial_ops, 865788e7a89STrond Myklebust nbytes, offset, how); 8661da177e4SLinus Torvalds nbytes = 0; 8671da177e4SLinus Torvalds } 8681da177e4SLinus Torvalds nfs_execute_write(data); 8691da177e4SLinus Torvalds } while (nbytes != 0); 8701da177e4SLinus Torvalds 8711da177e4SLinus Torvalds return 0; 8721da177e4SLinus Torvalds 8731da177e4SLinus Torvalds out_bad: 8741da177e4SLinus Torvalds while (!list_empty(&list)) { 8751da177e4SLinus Torvalds data = list_entry(list.next, struct nfs_write_data, pages); 8761da177e4SLinus Torvalds list_del(&data->pages); 8778aca67f0STrond Myklebust nfs_writedata_release(data); 8781da177e4SLinus Torvalds } 8791da177e4SLinus Torvalds nfs_mark_request_dirty(req); 880c6a556b8STrond Myklebust nfs_clear_page_writeback(req); 8811da177e4SLinus Torvalds return -ENOMEM; 8821da177e4SLinus Torvalds } 8831da177e4SLinus Torvalds 8841da177e4SLinus Torvalds /* 8851da177e4SLinus Torvalds * Create an RPC task for the given write request and kick it. 8861da177e4SLinus Torvalds * The page must have been locked by the caller. 8871da177e4SLinus Torvalds * 8881da177e4SLinus Torvalds * It may happen that the page we're passed is not marked dirty. 8891da177e4SLinus Torvalds * This is the case if nfs_updatepage detects a conflicting request 8901da177e4SLinus Torvalds * that has been written but not committed. 8911da177e4SLinus Torvalds */ 8927d46a49fSTrond Myklebust static int nfs_flush_one(struct inode *inode, struct list_head *head, int how) 8931da177e4SLinus Torvalds { 8941da177e4SLinus Torvalds struct nfs_page *req; 8951da177e4SLinus Torvalds struct page **pages; 8961da177e4SLinus Torvalds struct nfs_write_data *data; 8971da177e4SLinus Torvalds unsigned int count; 8981da177e4SLinus Torvalds 899e9f7bee1STrond Myklebust data = nfs_writedata_alloc(NFS_SERVER(inode)->wsize); 9001da177e4SLinus Torvalds if (!data) 9011da177e4SLinus Torvalds goto out_bad; 9021da177e4SLinus Torvalds 9031da177e4SLinus Torvalds pages = data->pagevec; 9041da177e4SLinus Torvalds count = 0; 9051da177e4SLinus Torvalds while (!list_empty(head)) { 9061da177e4SLinus Torvalds req = nfs_list_entry(head->next); 9071da177e4SLinus Torvalds nfs_list_remove_request(req); 9081da177e4SLinus Torvalds nfs_list_add_request(req, &data->pages); 9091da177e4SLinus Torvalds ClearPageError(req->wb_page); 910bb713d6dSTrond Myklebust set_page_writeback(req->wb_page); 9111da177e4SLinus Torvalds *pages++ = req->wb_page; 9121da177e4SLinus Torvalds count += req->wb_bytes; 9131da177e4SLinus Torvalds } 9141da177e4SLinus Torvalds req = nfs_list_entry(data->pages.next); 9151da177e4SLinus Torvalds 9161da177e4SLinus Torvalds /* Set up the argument struct */ 917788e7a89STrond Myklebust nfs_write_rpcsetup(req, data, &nfs_write_full_ops, count, 0, how); 9181da177e4SLinus Torvalds 9191da177e4SLinus Torvalds nfs_execute_write(data); 9201da177e4SLinus Torvalds return 0; 9211da177e4SLinus Torvalds out_bad: 9221da177e4SLinus Torvalds while (!list_empty(head)) { 9231da177e4SLinus Torvalds struct nfs_page *req = nfs_list_entry(head->next); 9241da177e4SLinus Torvalds nfs_list_remove_request(req); 9251da177e4SLinus Torvalds nfs_mark_request_dirty(req); 926c6a556b8STrond Myklebust nfs_clear_page_writeback(req); 9271da177e4SLinus Torvalds } 9281da177e4SLinus Torvalds return -ENOMEM; 9291da177e4SLinus Torvalds } 9301da177e4SLinus Torvalds 9317d46a49fSTrond Myklebust static int nfs_flush_list(struct inode *inode, struct list_head *head, int npages, int how) 9321da177e4SLinus Torvalds { 9331da177e4SLinus Torvalds LIST_HEAD(one_request); 9347d46a49fSTrond Myklebust int (*flush_one)(struct inode *, struct list_head *, int); 9351da177e4SLinus Torvalds struct nfs_page *req; 9367d46a49fSTrond Myklebust int wpages = NFS_SERVER(inode)->wpages; 9377d46a49fSTrond Myklebust int wsize = NFS_SERVER(inode)->wsize; 9387d46a49fSTrond Myklebust int error; 9391da177e4SLinus Torvalds 9407d46a49fSTrond Myklebust flush_one = nfs_flush_one; 9417d46a49fSTrond Myklebust if (wsize < PAGE_CACHE_SIZE) 9427d46a49fSTrond Myklebust flush_one = nfs_flush_multi; 9437d46a49fSTrond Myklebust /* For single writes, FLUSH_STABLE is more efficient */ 9447d46a49fSTrond Myklebust if (npages <= wpages && npages == NFS_I(inode)->npages 9457d46a49fSTrond Myklebust && nfs_list_entry(head->next)->wb_bytes <= wsize) 9467d46a49fSTrond Myklebust how |= FLUSH_STABLE; 9477d46a49fSTrond Myklebust 9487d46a49fSTrond Myklebust do { 9497d46a49fSTrond Myklebust nfs_coalesce_requests(head, &one_request, wpages); 9501da177e4SLinus Torvalds req = nfs_list_entry(one_request.next); 9517d46a49fSTrond Myklebust error = flush_one(inode, &one_request, how); 9521da177e4SLinus Torvalds if (error < 0) 9537d46a49fSTrond Myklebust goto out_err; 9547d46a49fSTrond Myklebust } while (!list_empty(head)); 9557d46a49fSTrond Myklebust return 0; 9567d46a49fSTrond Myklebust out_err: 9571da177e4SLinus Torvalds while (!list_empty(head)) { 9581da177e4SLinus Torvalds req = nfs_list_entry(head->next); 9591da177e4SLinus Torvalds nfs_list_remove_request(req); 9601da177e4SLinus Torvalds nfs_mark_request_dirty(req); 961c6a556b8STrond Myklebust nfs_clear_page_writeback(req); 9621da177e4SLinus Torvalds } 9631da177e4SLinus Torvalds return error; 9641da177e4SLinus Torvalds } 9651da177e4SLinus Torvalds 9661da177e4SLinus Torvalds /* 9671da177e4SLinus Torvalds * Handle a write reply that flushed part of a page. 9681da177e4SLinus Torvalds */ 969788e7a89STrond Myklebust static void nfs_writeback_done_partial(struct rpc_task *task, void *calldata) 9701da177e4SLinus Torvalds { 971788e7a89STrond Myklebust struct nfs_write_data *data = calldata; 9721da177e4SLinus Torvalds struct nfs_page *req = data->req; 9731da177e4SLinus Torvalds struct page *page = req->wb_page; 9741da177e4SLinus Torvalds 9751da177e4SLinus Torvalds dprintk("NFS: write (%s/%Ld %d@%Ld)", 9761da177e4SLinus Torvalds req->wb_context->dentry->d_inode->i_sb->s_id, 9771da177e4SLinus Torvalds (long long)NFS_FILEID(req->wb_context->dentry->d_inode), 9781da177e4SLinus Torvalds req->wb_bytes, 9791da177e4SLinus Torvalds (long long)req_offset(req)); 9801da177e4SLinus Torvalds 981788e7a89STrond Myklebust if (nfs_writeback_done(task, data) != 0) 982788e7a89STrond Myklebust return; 983788e7a89STrond Myklebust 984788e7a89STrond Myklebust if (task->tk_status < 0) { 9851da177e4SLinus Torvalds ClearPageUptodate(page); 9861da177e4SLinus Torvalds SetPageError(page); 987788e7a89STrond Myklebust req->wb_context->error = task->tk_status; 988788e7a89STrond Myklebust dprintk(", error = %d\n", task->tk_status); 9891da177e4SLinus Torvalds } else { 9901da177e4SLinus Torvalds #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) 9911da177e4SLinus Torvalds if (data->verf.committed < NFS_FILE_SYNC) { 9921da177e4SLinus Torvalds if (!NFS_NEED_COMMIT(req)) { 9931da177e4SLinus Torvalds nfs_defer_commit(req); 9941da177e4SLinus Torvalds memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); 9951da177e4SLinus Torvalds dprintk(" defer commit\n"); 9961da177e4SLinus Torvalds } else if (memcmp(&req->wb_verf, &data->verf, sizeof(req->wb_verf))) { 9971da177e4SLinus Torvalds nfs_defer_reschedule(req); 9981da177e4SLinus Torvalds dprintk(" server reboot detected\n"); 9991da177e4SLinus Torvalds } 10001da177e4SLinus Torvalds } else 10011da177e4SLinus Torvalds #endif 10021da177e4SLinus Torvalds dprintk(" OK\n"); 10031da177e4SLinus Torvalds } 10041da177e4SLinus Torvalds 10051da177e4SLinus Torvalds if (atomic_dec_and_test(&req->wb_complete)) 10061da177e4SLinus Torvalds nfs_writepage_release(req); 10071da177e4SLinus Torvalds } 10081da177e4SLinus Torvalds 1009788e7a89STrond Myklebust static const struct rpc_call_ops nfs_write_partial_ops = { 1010788e7a89STrond Myklebust .rpc_call_done = nfs_writeback_done_partial, 1011788e7a89STrond Myklebust .rpc_release = nfs_writedata_release, 1012788e7a89STrond Myklebust }; 1013788e7a89STrond Myklebust 10141da177e4SLinus Torvalds /* 10151da177e4SLinus Torvalds * Handle a write reply that flushes a whole page. 10161da177e4SLinus Torvalds * 10171da177e4SLinus Torvalds * FIXME: There is an inherent race with invalidate_inode_pages and 10181da177e4SLinus Torvalds * writebacks since the page->count is kept > 1 for as long 10191da177e4SLinus Torvalds * as the page has a write request pending. 10201da177e4SLinus Torvalds */ 1021788e7a89STrond Myklebust static void nfs_writeback_done_full(struct rpc_task *task, void *calldata) 10221da177e4SLinus Torvalds { 1023788e7a89STrond Myklebust struct nfs_write_data *data = calldata; 10241da177e4SLinus Torvalds struct nfs_page *req; 10251da177e4SLinus Torvalds struct page *page; 10261da177e4SLinus Torvalds 1027788e7a89STrond Myklebust if (nfs_writeback_done(task, data) != 0) 1028788e7a89STrond Myklebust return; 1029788e7a89STrond Myklebust 10301da177e4SLinus Torvalds /* Update attributes as result of writeback. */ 10311da177e4SLinus Torvalds while (!list_empty(&data->pages)) { 10321da177e4SLinus Torvalds req = nfs_list_entry(data->pages.next); 10331da177e4SLinus Torvalds nfs_list_remove_request(req); 10341da177e4SLinus Torvalds page = req->wb_page; 10351da177e4SLinus Torvalds 10361da177e4SLinus Torvalds dprintk("NFS: write (%s/%Ld %d@%Ld)", 10371da177e4SLinus Torvalds req->wb_context->dentry->d_inode->i_sb->s_id, 10381da177e4SLinus Torvalds (long long)NFS_FILEID(req->wb_context->dentry->d_inode), 10391da177e4SLinus Torvalds req->wb_bytes, 10401da177e4SLinus Torvalds (long long)req_offset(req)); 10411da177e4SLinus Torvalds 1042788e7a89STrond Myklebust if (task->tk_status < 0) { 10431da177e4SLinus Torvalds ClearPageUptodate(page); 10441da177e4SLinus Torvalds SetPageError(page); 1045788e7a89STrond Myklebust req->wb_context->error = task->tk_status; 10461da177e4SLinus Torvalds end_page_writeback(page); 10471da177e4SLinus Torvalds nfs_inode_remove_request(req); 1048788e7a89STrond Myklebust dprintk(", error = %d\n", task->tk_status); 10491da177e4SLinus Torvalds goto next; 10501da177e4SLinus Torvalds } 10511da177e4SLinus Torvalds end_page_writeback(page); 10521da177e4SLinus Torvalds 10531da177e4SLinus Torvalds #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) 10541da177e4SLinus Torvalds if (data->args.stable != NFS_UNSTABLE || data->verf.committed == NFS_FILE_SYNC) { 10551da177e4SLinus Torvalds nfs_inode_remove_request(req); 10561da177e4SLinus Torvalds dprintk(" OK\n"); 10571da177e4SLinus Torvalds goto next; 10581da177e4SLinus Torvalds } 10591da177e4SLinus Torvalds memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); 10601da177e4SLinus Torvalds nfs_mark_request_commit(req); 10611da177e4SLinus Torvalds dprintk(" marked for commit\n"); 10621da177e4SLinus Torvalds #else 10631da177e4SLinus Torvalds nfs_inode_remove_request(req); 10641da177e4SLinus Torvalds #endif 10651da177e4SLinus Torvalds next: 1066c6a556b8STrond Myklebust nfs_clear_page_writeback(req); 10671da177e4SLinus Torvalds } 10681da177e4SLinus Torvalds } 10691da177e4SLinus Torvalds 1070788e7a89STrond Myklebust static const struct rpc_call_ops nfs_write_full_ops = { 1071788e7a89STrond Myklebust .rpc_call_done = nfs_writeback_done_full, 1072788e7a89STrond Myklebust .rpc_release = nfs_writedata_release, 1073788e7a89STrond Myklebust }; 1074788e7a89STrond Myklebust 1075788e7a89STrond Myklebust 10761da177e4SLinus Torvalds /* 10771da177e4SLinus Torvalds * This function is called when the WRITE call is complete. 10781da177e4SLinus Torvalds */ 1079462d5b32SChuck Lever int nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data) 10801da177e4SLinus Torvalds { 10811da177e4SLinus Torvalds struct nfs_writeargs *argp = &data->args; 10821da177e4SLinus Torvalds struct nfs_writeres *resp = &data->res; 1083788e7a89STrond Myklebust int status; 10841da177e4SLinus Torvalds 10851da177e4SLinus Torvalds dprintk("NFS: %4d nfs_writeback_done (status %d)\n", 10861da177e4SLinus Torvalds task->tk_pid, task->tk_status); 10871da177e4SLinus Torvalds 1088f551e44fSChuck Lever /* 1089f551e44fSChuck Lever * ->write_done will attempt to use post-op attributes to detect 1090f551e44fSChuck Lever * conflicting writes by other clients. A strict interpretation 1091f551e44fSChuck Lever * of close-to-open would allow us to continue caching even if 1092f551e44fSChuck Lever * another writer had changed the file, but some applications 1093f551e44fSChuck Lever * depend on tighter cache coherency when writing. 1094f551e44fSChuck Lever */ 1095788e7a89STrond Myklebust status = NFS_PROTO(data->inode)->write_done(task, data); 1096788e7a89STrond Myklebust if (status != 0) 1097788e7a89STrond Myklebust return status; 109891d5b470SChuck Lever nfs_add_stats(data->inode, NFSIOS_SERVERWRITTENBYTES, resp->count); 109991d5b470SChuck Lever 11001da177e4SLinus Torvalds #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) 11011da177e4SLinus Torvalds if (resp->verf->committed < argp->stable && task->tk_status >= 0) { 11021da177e4SLinus Torvalds /* We tried a write call, but the server did not 11031da177e4SLinus Torvalds * commit data to stable storage even though we 11041da177e4SLinus Torvalds * requested it. 11051da177e4SLinus Torvalds * Note: There is a known bug in Tru64 < 5.0 in which 11061da177e4SLinus Torvalds * the server reports NFS_DATA_SYNC, but performs 11071da177e4SLinus Torvalds * NFS_FILE_SYNC. We therefore implement this checking 11081da177e4SLinus Torvalds * as a dprintk() in order to avoid filling syslog. 11091da177e4SLinus Torvalds */ 11101da177e4SLinus Torvalds static unsigned long complain; 11111da177e4SLinus Torvalds 11121da177e4SLinus Torvalds if (time_before(complain, jiffies)) { 11131da177e4SLinus Torvalds dprintk("NFS: faulty NFS server %s:" 11141da177e4SLinus Torvalds " (committed = %d) != (stable = %d)\n", 111554ceac45SDavid Howells NFS_SERVER(data->inode)->nfs_client->cl_hostname, 11161da177e4SLinus Torvalds resp->verf->committed, argp->stable); 11171da177e4SLinus Torvalds complain = jiffies + 300 * HZ; 11181da177e4SLinus Torvalds } 11191da177e4SLinus Torvalds } 11201da177e4SLinus Torvalds #endif 11211da177e4SLinus Torvalds /* Is this a short write? */ 11221da177e4SLinus Torvalds if (task->tk_status >= 0 && resp->count < argp->count) { 11231da177e4SLinus Torvalds static unsigned long complain; 11241da177e4SLinus Torvalds 112591d5b470SChuck Lever nfs_inc_stats(data->inode, NFSIOS_SHORTWRITE); 112691d5b470SChuck Lever 11271da177e4SLinus Torvalds /* Has the server at least made some progress? */ 11281da177e4SLinus Torvalds if (resp->count != 0) { 11291da177e4SLinus Torvalds /* Was this an NFSv2 write or an NFSv3 stable write? */ 11301da177e4SLinus Torvalds if (resp->verf->committed != NFS_UNSTABLE) { 11311da177e4SLinus Torvalds /* Resend from where the server left off */ 11321da177e4SLinus Torvalds argp->offset += resp->count; 11331da177e4SLinus Torvalds argp->pgbase += resp->count; 11341da177e4SLinus Torvalds argp->count -= resp->count; 11351da177e4SLinus Torvalds } else { 11361da177e4SLinus Torvalds /* Resend as a stable write in order to avoid 11371da177e4SLinus Torvalds * headaches in the case of a server crash. 11381da177e4SLinus Torvalds */ 11391da177e4SLinus Torvalds argp->stable = NFS_FILE_SYNC; 11401da177e4SLinus Torvalds } 11411da177e4SLinus Torvalds rpc_restart_call(task); 1142788e7a89STrond Myklebust return -EAGAIN; 11431da177e4SLinus Torvalds } 11441da177e4SLinus Torvalds if (time_before(complain, jiffies)) { 11451da177e4SLinus Torvalds printk(KERN_WARNING 11461da177e4SLinus Torvalds "NFS: Server wrote zero bytes, expected %u.\n", 11471da177e4SLinus Torvalds argp->count); 11481da177e4SLinus Torvalds complain = jiffies + 300 * HZ; 11491da177e4SLinus Torvalds } 11501da177e4SLinus Torvalds /* Can't do anything about it except throw an error. */ 11511da177e4SLinus Torvalds task->tk_status = -EIO; 11521da177e4SLinus Torvalds } 1153788e7a89STrond Myklebust return 0; 11541da177e4SLinus Torvalds } 11551da177e4SLinus Torvalds 11561da177e4SLinus Torvalds 11571da177e4SLinus Torvalds #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) 1158963d8fe5STrond Myklebust void nfs_commit_release(void *wdata) 11591da177e4SLinus Torvalds { 11601da177e4SLinus Torvalds nfs_commit_free(wdata); 11611da177e4SLinus Torvalds } 11621da177e4SLinus Torvalds 11631da177e4SLinus Torvalds /* 11641da177e4SLinus Torvalds * Set up the argument/result storage required for the RPC call. 11651da177e4SLinus Torvalds */ 11661da177e4SLinus Torvalds static void nfs_commit_rpcsetup(struct list_head *head, 1167788e7a89STrond Myklebust struct nfs_write_data *data, 1168788e7a89STrond Myklebust int how) 11691da177e4SLinus Torvalds { 11703da28eb1STrond Myklebust struct nfs_page *first; 11711da177e4SLinus Torvalds struct inode *inode; 1172788e7a89STrond Myklebust int flags; 11731da177e4SLinus Torvalds 11741da177e4SLinus Torvalds /* Set up the RPC argument and reply structs 11751da177e4SLinus Torvalds * NB: take care not to mess about with data->commit et al. */ 11761da177e4SLinus Torvalds 11771da177e4SLinus Torvalds list_splice_init(head, &data->pages); 11781da177e4SLinus Torvalds first = nfs_list_entry(data->pages.next); 11791da177e4SLinus Torvalds inode = first->wb_context->dentry->d_inode; 11801da177e4SLinus Torvalds 11811da177e4SLinus Torvalds data->inode = inode; 11821da177e4SLinus Torvalds data->cred = first->wb_context->cred; 11831da177e4SLinus Torvalds 11841da177e4SLinus Torvalds data->args.fh = NFS_FH(data->inode); 11853da28eb1STrond Myklebust /* Note: we always request a commit of the entire inode */ 11863da28eb1STrond Myklebust data->args.offset = 0; 11873da28eb1STrond Myklebust data->args.count = 0; 11883da28eb1STrond Myklebust data->res.count = 0; 11891da177e4SLinus Torvalds data->res.fattr = &data->fattr; 11901da177e4SLinus Torvalds data->res.verf = &data->verf; 11910e574af1STrond Myklebust nfs_fattr_init(&data->fattr); 11921da177e4SLinus Torvalds 1193788e7a89STrond Myklebust /* Set up the initial task struct. */ 1194788e7a89STrond Myklebust flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; 1195788e7a89STrond Myklebust rpc_init_task(&data->task, NFS_CLIENT(inode), flags, &nfs_commit_ops, data); 11961da177e4SLinus Torvalds NFS_PROTO(inode)->commit_setup(data, how); 11971da177e4SLinus Torvalds 11981da177e4SLinus Torvalds data->task.tk_priority = flush_task_priority(how); 11991da177e4SLinus Torvalds data->task.tk_cookie = (unsigned long)inode; 12001da177e4SLinus Torvalds 12010bbacc40SChuck Lever dprintk("NFS: %4d initiated commit call\n", data->task.tk_pid); 12021da177e4SLinus Torvalds } 12031da177e4SLinus Torvalds 12041da177e4SLinus Torvalds /* 12051da177e4SLinus Torvalds * Commit dirty pages 12061da177e4SLinus Torvalds */ 12071da177e4SLinus Torvalds static int 120840859d7eSChuck Lever nfs_commit_list(struct inode *inode, struct list_head *head, int how) 12091da177e4SLinus Torvalds { 12101da177e4SLinus Torvalds struct nfs_write_data *data; 12111da177e4SLinus Torvalds struct nfs_page *req; 12121da177e4SLinus Torvalds 1213e9f7bee1STrond Myklebust data = nfs_commit_alloc(); 12141da177e4SLinus Torvalds 12151da177e4SLinus Torvalds if (!data) 12161da177e4SLinus Torvalds goto out_bad; 12171da177e4SLinus Torvalds 12181da177e4SLinus Torvalds /* Set up the argument struct */ 12191da177e4SLinus Torvalds nfs_commit_rpcsetup(head, data, how); 12201da177e4SLinus Torvalds 12211da177e4SLinus Torvalds nfs_execute_write(data); 12221da177e4SLinus Torvalds return 0; 12231da177e4SLinus Torvalds out_bad: 12241da177e4SLinus Torvalds while (!list_empty(head)) { 12251da177e4SLinus Torvalds req = nfs_list_entry(head->next); 12261da177e4SLinus Torvalds nfs_list_remove_request(req); 12271da177e4SLinus Torvalds nfs_mark_request_commit(req); 122883715ad5STrond Myklebust dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); 12295c2d97cbSTrond Myklebust nfs_clear_page_writeback(req); 12301da177e4SLinus Torvalds } 12311da177e4SLinus Torvalds return -ENOMEM; 12321da177e4SLinus Torvalds } 12331da177e4SLinus Torvalds 12341da177e4SLinus Torvalds /* 12351da177e4SLinus Torvalds * COMMIT call returned 12361da177e4SLinus Torvalds */ 1237788e7a89STrond Myklebust static void nfs_commit_done(struct rpc_task *task, void *calldata) 12381da177e4SLinus Torvalds { 1239963d8fe5STrond Myklebust struct nfs_write_data *data = calldata; 12401da177e4SLinus Torvalds struct nfs_page *req; 12411da177e4SLinus Torvalds 12421da177e4SLinus Torvalds dprintk("NFS: %4d nfs_commit_done (status %d)\n", 12431da177e4SLinus Torvalds task->tk_pid, task->tk_status); 12441da177e4SLinus Torvalds 1245788e7a89STrond Myklebust /* Call the NFS version-specific code */ 1246788e7a89STrond Myklebust if (NFS_PROTO(data->inode)->commit_done(task, data) != 0) 1247788e7a89STrond Myklebust return; 1248788e7a89STrond Myklebust 12491da177e4SLinus Torvalds while (!list_empty(&data->pages)) { 12501da177e4SLinus Torvalds req = nfs_list_entry(data->pages.next); 12511da177e4SLinus Torvalds nfs_list_remove_request(req); 1252fd39fc85SChristoph Lameter dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); 12531da177e4SLinus Torvalds 12541da177e4SLinus Torvalds dprintk("NFS: commit (%s/%Ld %d@%Ld)", 12551da177e4SLinus Torvalds req->wb_context->dentry->d_inode->i_sb->s_id, 12561da177e4SLinus Torvalds (long long)NFS_FILEID(req->wb_context->dentry->d_inode), 12571da177e4SLinus Torvalds req->wb_bytes, 12581da177e4SLinus Torvalds (long long)req_offset(req)); 12591da177e4SLinus Torvalds if (task->tk_status < 0) { 12601da177e4SLinus Torvalds req->wb_context->error = task->tk_status; 12611da177e4SLinus Torvalds nfs_inode_remove_request(req); 12621da177e4SLinus Torvalds dprintk(", error = %d\n", task->tk_status); 12631da177e4SLinus Torvalds goto next; 12641da177e4SLinus Torvalds } 12651da177e4SLinus Torvalds 12661da177e4SLinus Torvalds /* Okay, COMMIT succeeded, apparently. Check the verifier 12671da177e4SLinus Torvalds * returned by the server against all stored verfs. */ 12681da177e4SLinus Torvalds if (!memcmp(req->wb_verf.verifier, data->verf.verifier, sizeof(data->verf.verifier))) { 12691da177e4SLinus Torvalds /* We have a match */ 12701da177e4SLinus Torvalds nfs_inode_remove_request(req); 12711da177e4SLinus Torvalds dprintk(" OK\n"); 12721da177e4SLinus Torvalds goto next; 12731da177e4SLinus Torvalds } 12741da177e4SLinus Torvalds /* We have a mismatch. Write the page again */ 12751da177e4SLinus Torvalds dprintk(" mismatch\n"); 12761da177e4SLinus Torvalds nfs_mark_request_dirty(req); 12771da177e4SLinus Torvalds next: 1278c6a556b8STrond Myklebust nfs_clear_page_writeback(req); 12791da177e4SLinus Torvalds } 12801da177e4SLinus Torvalds } 1281788e7a89STrond Myklebust 1282788e7a89STrond Myklebust static const struct rpc_call_ops nfs_commit_ops = { 1283788e7a89STrond Myklebust .rpc_call_done = nfs_commit_done, 1284788e7a89STrond Myklebust .rpc_release = nfs_commit_release, 1285788e7a89STrond Myklebust }; 1286c42de9ddSTrond Myklebust #else 1287c42de9ddSTrond Myklebust static inline int nfs_commit_list(struct inode *inode, struct list_head *head, int how) 1288c42de9ddSTrond Myklebust { 1289c42de9ddSTrond Myklebust return 0; 1290c42de9ddSTrond Myklebust } 12911da177e4SLinus Torvalds #endif 12921da177e4SLinus Torvalds 12933f442547STrond Myklebust static long nfs_flush_mapping(struct address_space *mapping, struct writeback_control *wbc, int how) 12941da177e4SLinus Torvalds { 129528c6925fSTrond Myklebust struct nfs_inode *nfsi = NFS_I(mapping->host); 12961da177e4SLinus Torvalds LIST_HEAD(head); 12973f442547STrond Myklebust long res; 12981da177e4SLinus Torvalds 12991da177e4SLinus Torvalds spin_lock(&nfsi->req_lock); 13003f442547STrond Myklebust res = nfs_scan_dirty(mapping, wbc, &head); 13011da177e4SLinus Torvalds spin_unlock(&nfsi->req_lock); 1302ab0a3dbeSTrond Myklebust if (res) { 130328c6925fSTrond Myklebust int error = nfs_flush_list(mapping->host, &head, res, how); 13041da177e4SLinus Torvalds if (error < 0) 13051da177e4SLinus Torvalds return error; 13067d46a49fSTrond Myklebust } 13071da177e4SLinus Torvalds return res; 13081da177e4SLinus Torvalds } 13091da177e4SLinus Torvalds 13101da177e4SLinus Torvalds #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) 13113da28eb1STrond Myklebust int nfs_commit_inode(struct inode *inode, int how) 13121da177e4SLinus Torvalds { 13131da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 13141da177e4SLinus Torvalds LIST_HEAD(head); 13157d46a49fSTrond Myklebust int res; 13161da177e4SLinus Torvalds 13171da177e4SLinus Torvalds spin_lock(&nfsi->req_lock); 13183da28eb1STrond Myklebust res = nfs_scan_commit(inode, &head, 0, 0); 13193da28eb1STrond Myklebust spin_unlock(&nfsi->req_lock); 13201da177e4SLinus Torvalds if (res) { 13217d46a49fSTrond Myklebust int error = nfs_commit_list(inode, &head, how); 13221da177e4SLinus Torvalds if (error < 0) 13231da177e4SLinus Torvalds return error; 13243da28eb1STrond Myklebust } 13251da177e4SLinus Torvalds return res; 13261da177e4SLinus Torvalds } 13271da177e4SLinus Torvalds #endif 13281da177e4SLinus Torvalds 13291c75950bSTrond Myklebust long nfs_sync_mapping_wait(struct address_space *mapping, struct writeback_control *wbc, int how) 13301da177e4SLinus Torvalds { 13311c75950bSTrond Myklebust struct inode *inode = mapping->host; 1332c42de9ddSTrond Myklebust struct nfs_inode *nfsi = NFS_I(inode); 13331c75950bSTrond Myklebust unsigned long idx_start, idx_end; 13341c75950bSTrond Myklebust unsigned int npages = 0; 1335c42de9ddSTrond Myklebust LIST_HEAD(head); 133670b9ecbdSTrond Myklebust int nocommit = how & FLUSH_NOCOMMIT; 13373f442547STrond Myklebust long pages, ret; 13381da177e4SLinus Torvalds 13391c75950bSTrond Myklebust /* FIXME */ 13401c75950bSTrond Myklebust if (wbc->range_cyclic) 13411c75950bSTrond Myklebust idx_start = 0; 13421c75950bSTrond Myklebust else { 13431c75950bSTrond Myklebust idx_start = wbc->range_start >> PAGE_CACHE_SHIFT; 13441c75950bSTrond Myklebust idx_end = wbc->range_end >> PAGE_CACHE_SHIFT; 13451c75950bSTrond Myklebust if (idx_end > idx_start) { 13461c75950bSTrond Myklebust unsigned long l_npages = 1 + idx_end - idx_start; 13471c75950bSTrond Myklebust npages = l_npages; 13481c75950bSTrond Myklebust if (sizeof(npages) != sizeof(l_npages) && 13491c75950bSTrond Myklebust (unsigned long)npages != l_npages) 13501c75950bSTrond Myklebust npages = 0; 13511c75950bSTrond Myklebust } 13521c75950bSTrond Myklebust } 1353c42de9ddSTrond Myklebust how &= ~FLUSH_NOCOMMIT; 1354c42de9ddSTrond Myklebust spin_lock(&nfsi->req_lock); 13551da177e4SLinus Torvalds do { 13561c75950bSTrond Myklebust wbc->pages_skipped = 0; 1357c42de9ddSTrond Myklebust ret = nfs_wait_on_requests_locked(inode, idx_start, npages); 1358c42de9ddSTrond Myklebust if (ret != 0) 1359c42de9ddSTrond Myklebust continue; 13601c75950bSTrond Myklebust pages = nfs_scan_dirty(mapping, wbc, &head); 1361c42de9ddSTrond Myklebust if (pages != 0) { 1362c42de9ddSTrond Myklebust spin_unlock(&nfsi->req_lock); 1363e8e058e8STrond Myklebust if (how & FLUSH_INVALIDATE) { 136483715ad5STrond Myklebust nfs_cancel_dirty_list(&head); 1365e8e058e8STrond Myklebust ret = pages; 1366e8e058e8STrond Myklebust } else 1367c42de9ddSTrond Myklebust ret = nfs_flush_list(inode, &head, pages, how); 1368c42de9ddSTrond Myklebust spin_lock(&nfsi->req_lock); 136970b9ecbdSTrond Myklebust continue; 137070b9ecbdSTrond Myklebust } 13711c75950bSTrond Myklebust if (wbc->pages_skipped != 0) 13721c75950bSTrond Myklebust continue; 1373c42de9ddSTrond Myklebust if (nocommit) 1374c42de9ddSTrond Myklebust break; 1375d2ccddf0STrond Myklebust pages = nfs_scan_commit(inode, &head, idx_start, npages); 13761c75950bSTrond Myklebust if (pages == 0) { 13771c75950bSTrond Myklebust if (wbc->pages_skipped != 0) 13781c75950bSTrond Myklebust continue; 1379c42de9ddSTrond Myklebust break; 13801c75950bSTrond Myklebust } 1381d2ccddf0STrond Myklebust if (how & FLUSH_INVALIDATE) { 1382d2ccddf0STrond Myklebust spin_unlock(&nfsi->req_lock); 138383715ad5STrond Myklebust nfs_cancel_commit_list(&head); 1384e8e058e8STrond Myklebust ret = pages; 1385d2ccddf0STrond Myklebust spin_lock(&nfsi->req_lock); 1386d2ccddf0STrond Myklebust continue; 1387d2ccddf0STrond Myklebust } 1388d2ccddf0STrond Myklebust pages += nfs_scan_commit(inode, &head, 0, 0); 1389c42de9ddSTrond Myklebust spin_unlock(&nfsi->req_lock); 1390c42de9ddSTrond Myklebust ret = nfs_commit_list(inode, &head, how); 1391c42de9ddSTrond Myklebust spin_lock(&nfsi->req_lock); 1392c42de9ddSTrond Myklebust } while (ret >= 0); 1393c42de9ddSTrond Myklebust spin_unlock(&nfsi->req_lock); 1394c42de9ddSTrond Myklebust return ret; 13951da177e4SLinus Torvalds } 13961da177e4SLinus Torvalds 13971c75950bSTrond Myklebust /* 13981c75950bSTrond Myklebust * flush the inode to disk. 13991c75950bSTrond Myklebust */ 14001c75950bSTrond Myklebust int nfs_wb_all(struct inode *inode) 14011c75950bSTrond Myklebust { 14021c75950bSTrond Myklebust struct address_space *mapping = inode->i_mapping; 14031c75950bSTrond Myklebust struct writeback_control wbc = { 14041c75950bSTrond Myklebust .bdi = mapping->backing_dev_info, 14051c75950bSTrond Myklebust .sync_mode = WB_SYNC_ALL, 14061c75950bSTrond Myklebust .nr_to_write = LONG_MAX, 14071c75950bSTrond Myklebust .range_cyclic = 1, 14081c75950bSTrond Myklebust }; 14091c75950bSTrond Myklebust int ret; 14101c75950bSTrond Myklebust 14111c75950bSTrond Myklebust ret = nfs_sync_mapping_wait(mapping, &wbc, 0); 14121c75950bSTrond Myklebust if (ret >= 0) 14131c75950bSTrond Myklebust return 0; 14141c75950bSTrond Myklebust return ret; 14151c75950bSTrond Myklebust } 14161c75950bSTrond Myklebust 14171c75950bSTrond Myklebust int nfs_sync_mapping_range(struct address_space *mapping, loff_t range_start, loff_t range_end, int how) 14181c75950bSTrond Myklebust { 14191c75950bSTrond Myklebust struct writeback_control wbc = { 14201c75950bSTrond Myklebust .bdi = mapping->backing_dev_info, 14211c75950bSTrond Myklebust .sync_mode = WB_SYNC_ALL, 14221c75950bSTrond Myklebust .nr_to_write = LONG_MAX, 14231c75950bSTrond Myklebust .range_start = range_start, 14241c75950bSTrond Myklebust .range_end = range_end, 14251c75950bSTrond Myklebust }; 14261c75950bSTrond Myklebust int ret; 14271c75950bSTrond Myklebust 14281c75950bSTrond Myklebust ret = nfs_sync_mapping_wait(mapping, &wbc, how); 14291c75950bSTrond Myklebust if (ret >= 0) 14301c75950bSTrond Myklebust return 0; 14311c75950bSTrond Myklebust return ret; 14321c75950bSTrond Myklebust } 14331c75950bSTrond Myklebust 14341c75950bSTrond Myklebust static int nfs_wb_page_priority(struct inode *inode, struct page *page, int how) 14351c75950bSTrond Myklebust { 14361c75950bSTrond Myklebust loff_t range_start = page_offset(page); 14371c75950bSTrond Myklebust loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); 14381c75950bSTrond Myklebust 14391c75950bSTrond Myklebust return nfs_sync_mapping_range(inode->i_mapping, range_start, range_end, how | FLUSH_STABLE); 14401c75950bSTrond Myklebust } 14411c75950bSTrond Myklebust 14421c75950bSTrond Myklebust /* 14431c75950bSTrond Myklebust * Write back all requests on one page - we do this before reading it. 14441c75950bSTrond Myklebust */ 14451c75950bSTrond Myklebust int nfs_wb_page(struct inode *inode, struct page* page) 14461c75950bSTrond Myklebust { 14471c75950bSTrond Myklebust return nfs_wb_page_priority(inode, page, 0); 14481c75950bSTrond Myklebust } 14491c75950bSTrond Myklebust 1450*1a54533eSTrond Myklebust int nfs_set_page_dirty(struct page *page) 1451*1a54533eSTrond Myklebust { 1452*1a54533eSTrond Myklebust struct nfs_page *req; 1453*1a54533eSTrond Myklebust 1454*1a54533eSTrond Myklebust req = nfs_page_find_request(page); 1455*1a54533eSTrond Myklebust if (req != NULL) { 1456*1a54533eSTrond Myklebust /* Mark any existing write requests for flushing */ 1457*1a54533eSTrond Myklebust set_bit(PG_NEED_FLUSH, &req->wb_flags); 1458*1a54533eSTrond Myklebust nfs_release_request(req); 1459*1a54533eSTrond Myklebust } 1460*1a54533eSTrond Myklebust return __set_page_dirty_nobuffers(page); 1461*1a54533eSTrond Myklebust } 1462*1a54533eSTrond Myklebust 14631c75950bSTrond Myklebust 1464f7b422b1SDavid Howells int __init nfs_init_writepagecache(void) 14651da177e4SLinus Torvalds { 14661da177e4SLinus Torvalds nfs_wdata_cachep = kmem_cache_create("nfs_write_data", 14671da177e4SLinus Torvalds sizeof(struct nfs_write_data), 14681da177e4SLinus Torvalds 0, SLAB_HWCACHE_ALIGN, 14691da177e4SLinus Torvalds NULL, NULL); 14701da177e4SLinus Torvalds if (nfs_wdata_cachep == NULL) 14711da177e4SLinus Torvalds return -ENOMEM; 14721da177e4SLinus Torvalds 147393d2341cSMatthew Dobson nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE, 14741da177e4SLinus Torvalds nfs_wdata_cachep); 14751da177e4SLinus Torvalds if (nfs_wdata_mempool == NULL) 14761da177e4SLinus Torvalds return -ENOMEM; 14771da177e4SLinus Torvalds 147893d2341cSMatthew Dobson nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT, 14791da177e4SLinus Torvalds nfs_wdata_cachep); 14801da177e4SLinus Torvalds if (nfs_commit_mempool == NULL) 14811da177e4SLinus Torvalds return -ENOMEM; 14821da177e4SLinus Torvalds 14831da177e4SLinus Torvalds return 0; 14841da177e4SLinus Torvalds } 14851da177e4SLinus Torvalds 1486266bee88SDavid Brownell void nfs_destroy_writepagecache(void) 14871da177e4SLinus Torvalds { 14881da177e4SLinus Torvalds mempool_destroy(nfs_commit_mempool); 14891da177e4SLinus Torvalds mempool_destroy(nfs_wdata_mempool); 14901a1d92c1SAlexey Dobriyan kmem_cache_destroy(nfs_wdata_cachep); 14911da177e4SLinus Torvalds } 14921da177e4SLinus Torvalds 1493