11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * linux/fs/nfs/write.c 31da177e4SLinus Torvalds * 47c85d900STrond Myklebust * Write file data over NFS. 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * Copyright (C) 1996, 1997, Olaf Kirch <okir@monad.swb.de> 71da177e4SLinus Torvalds */ 81da177e4SLinus Torvalds 91da177e4SLinus Torvalds #include <linux/types.h> 101da177e4SLinus Torvalds #include <linux/slab.h> 111da177e4SLinus Torvalds #include <linux/mm.h> 121da177e4SLinus Torvalds #include <linux/pagemap.h> 131da177e4SLinus Torvalds #include <linux/file.h> 141da177e4SLinus Torvalds #include <linux/writeback.h> 151da177e4SLinus Torvalds 161da177e4SLinus Torvalds #include <linux/sunrpc/clnt.h> 171da177e4SLinus Torvalds #include <linux/nfs_fs.h> 181da177e4SLinus Torvalds #include <linux/nfs_mount.h> 191da177e4SLinus Torvalds #include <linux/nfs_page.h> 203fcfab16SAndrew Morton #include <linux/backing-dev.h> 213fcfab16SAndrew Morton 221da177e4SLinus Torvalds #include <asm/uaccess.h> 231da177e4SLinus Torvalds #include <linux/smp_lock.h> 241da177e4SLinus Torvalds 251da177e4SLinus Torvalds #include "delegation.h" 2649a70f27STrond Myklebust #include "internal.h" 2791d5b470SChuck Lever #include "iostat.h" 281da177e4SLinus Torvalds 291da177e4SLinus Torvalds #define NFSDBG_FACILITY NFSDBG_PAGECACHE 301da177e4SLinus Torvalds 311da177e4SLinus Torvalds #define MIN_POOL_WRITE (32) 321da177e4SLinus Torvalds #define MIN_POOL_COMMIT (4) 331da177e4SLinus Torvalds 341da177e4SLinus Torvalds /* 351da177e4SLinus Torvalds * Local function declarations 361da177e4SLinus Torvalds */ 371da177e4SLinus Torvalds static struct nfs_page * nfs_update_request(struct nfs_open_context*, 381da177e4SLinus Torvalds struct page *, 391da177e4SLinus Torvalds unsigned int, unsigned int); 40e261f51fSTrond Myklebust static void nfs_mark_request_dirty(struct nfs_page *req); 411da177e4SLinus Torvalds static int nfs_wait_on_write_congestion(struct address_space *, int); 423f442547STrond Myklebust static long nfs_flush_mapping(struct address_space *mapping, struct writeback_control *wbc, int how); 43788e7a89STrond Myklebust static const struct rpc_call_ops nfs_write_partial_ops; 44788e7a89STrond Myklebust static const struct rpc_call_ops nfs_write_full_ops; 45788e7a89STrond Myklebust static const struct rpc_call_ops nfs_commit_ops; 461da177e4SLinus Torvalds 47e18b890bSChristoph Lameter static struct kmem_cache *nfs_wdata_cachep; 483feb2d49STrond Myklebust static mempool_t *nfs_wdata_mempool; 491da177e4SLinus Torvalds static mempool_t *nfs_commit_mempool; 501da177e4SLinus Torvalds 511da177e4SLinus Torvalds static DECLARE_WAIT_QUEUE_HEAD(nfs_write_congestion); 521da177e4SLinus Torvalds 53e9f7bee1STrond Myklebust struct nfs_write_data *nfs_commit_alloc(void) 541da177e4SLinus Torvalds { 55e6b4f8daSChristoph Lameter struct nfs_write_data *p = mempool_alloc(nfs_commit_mempool, GFP_NOFS); 5640859d7eSChuck Lever 571da177e4SLinus Torvalds if (p) { 581da177e4SLinus Torvalds memset(p, 0, sizeof(*p)); 591da177e4SLinus Torvalds INIT_LIST_HEAD(&p->pages); 601da177e4SLinus Torvalds } 611da177e4SLinus Torvalds return p; 621da177e4SLinus Torvalds } 631da177e4SLinus Torvalds 648aca67f0STrond Myklebust void nfs_commit_rcu_free(struct rcu_head *head) 651da177e4SLinus Torvalds { 668aca67f0STrond Myklebust struct nfs_write_data *p = container_of(head, struct nfs_write_data, task.u.tk_rcu); 6740859d7eSChuck Lever if (p && (p->pagevec != &p->page_array[0])) 6840859d7eSChuck Lever kfree(p->pagevec); 691da177e4SLinus Torvalds mempool_free(p, nfs_commit_mempool); 701da177e4SLinus Torvalds } 711da177e4SLinus Torvalds 728aca67f0STrond Myklebust void nfs_commit_free(struct nfs_write_data *wdata) 738aca67f0STrond Myklebust { 748aca67f0STrond Myklebust call_rcu_bh(&wdata->task.u.tk_rcu, nfs_commit_rcu_free); 758aca67f0STrond Myklebust } 768aca67f0STrond Myklebust 77e9f7bee1STrond Myklebust struct nfs_write_data *nfs_writedata_alloc(size_t len) 783feb2d49STrond Myklebust { 79e9f7bee1STrond Myklebust unsigned int pagecount = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; 80e6b4f8daSChristoph Lameter struct nfs_write_data *p = mempool_alloc(nfs_wdata_mempool, GFP_NOFS); 813feb2d49STrond Myklebust 823feb2d49STrond Myklebust if (p) { 833feb2d49STrond Myklebust memset(p, 0, sizeof(*p)); 843feb2d49STrond Myklebust INIT_LIST_HEAD(&p->pages); 85e9f7bee1STrond Myklebust p->npages = pagecount; 860d0b5cb3SChuck Lever if (pagecount <= ARRAY_SIZE(p->page_array)) 870d0b5cb3SChuck Lever p->pagevec = p->page_array; 883feb2d49STrond Myklebust else { 890d0b5cb3SChuck Lever p->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_NOFS); 900d0b5cb3SChuck Lever if (!p->pagevec) { 913feb2d49STrond Myklebust mempool_free(p, nfs_wdata_mempool); 923feb2d49STrond Myklebust p = NULL; 933feb2d49STrond Myklebust } 943feb2d49STrond Myklebust } 953feb2d49STrond Myklebust } 963feb2d49STrond Myklebust return p; 973feb2d49STrond Myklebust } 983feb2d49STrond Myklebust 998aca67f0STrond Myklebust static void nfs_writedata_rcu_free(struct rcu_head *head) 1003feb2d49STrond Myklebust { 1018aca67f0STrond Myklebust struct nfs_write_data *p = container_of(head, struct nfs_write_data, task.u.tk_rcu); 1023feb2d49STrond Myklebust if (p && (p->pagevec != &p->page_array[0])) 1033feb2d49STrond Myklebust kfree(p->pagevec); 1043feb2d49STrond Myklebust mempool_free(p, nfs_wdata_mempool); 1053feb2d49STrond Myklebust } 1063feb2d49STrond Myklebust 1078aca67f0STrond Myklebust static void nfs_writedata_free(struct nfs_write_data *wdata) 1088aca67f0STrond Myklebust { 1098aca67f0STrond Myklebust call_rcu_bh(&wdata->task.u.tk_rcu, nfs_writedata_rcu_free); 1108aca67f0STrond Myklebust } 1118aca67f0STrond Myklebust 112963d8fe5STrond Myklebust void nfs_writedata_release(void *wdata) 1131da177e4SLinus Torvalds { 1141da177e4SLinus Torvalds nfs_writedata_free(wdata); 1151da177e4SLinus Torvalds } 1161da177e4SLinus Torvalds 117277459d2STrond Myklebust static struct nfs_page *nfs_page_find_request_locked(struct page *page) 118277459d2STrond Myklebust { 119277459d2STrond Myklebust struct nfs_page *req = NULL; 120277459d2STrond Myklebust 121277459d2STrond Myklebust if (PagePrivate(page)) { 122277459d2STrond Myklebust req = (struct nfs_page *)page_private(page); 123277459d2STrond Myklebust if (req != NULL) 124277459d2STrond Myklebust atomic_inc(&req->wb_count); 125277459d2STrond Myklebust } 126277459d2STrond Myklebust return req; 127277459d2STrond Myklebust } 128277459d2STrond Myklebust 129277459d2STrond Myklebust static struct nfs_page *nfs_page_find_request(struct page *page) 130277459d2STrond Myklebust { 131277459d2STrond Myklebust struct nfs_page *req = NULL; 132277459d2STrond Myklebust spinlock_t *req_lock = &NFS_I(page->mapping->host)->req_lock; 133277459d2STrond Myklebust 134277459d2STrond Myklebust spin_lock(req_lock); 135277459d2STrond Myklebust req = nfs_page_find_request_locked(page); 136277459d2STrond Myklebust spin_unlock(req_lock); 137277459d2STrond Myklebust return req; 138277459d2STrond Myklebust } 139277459d2STrond Myklebust 1401da177e4SLinus Torvalds /* Adjust the file length if we're writing beyond the end */ 1411da177e4SLinus Torvalds static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int count) 1421da177e4SLinus Torvalds { 1431da177e4SLinus Torvalds struct inode *inode = page->mapping->host; 1441da177e4SLinus Torvalds loff_t end, i_size = i_size_read(inode); 1451da177e4SLinus Torvalds unsigned long end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; 1461da177e4SLinus Torvalds 1471da177e4SLinus Torvalds if (i_size > 0 && page->index < end_index) 1481da177e4SLinus Torvalds return; 1491da177e4SLinus Torvalds end = ((loff_t)page->index << PAGE_CACHE_SHIFT) + ((loff_t)offset+count); 1501da177e4SLinus Torvalds if (i_size >= end) 1511da177e4SLinus Torvalds return; 15291d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_EXTENDWRITE); 1531da177e4SLinus Torvalds i_size_write(inode, end); 1541da177e4SLinus Torvalds } 1551da177e4SLinus Torvalds 156a301b777STrond Myklebust /* A writeback failed: mark the page as bad, and invalidate the page cache */ 157a301b777STrond Myklebust static void nfs_set_pageerror(struct page *page) 158a301b777STrond Myklebust { 159a301b777STrond Myklebust SetPageError(page); 160a301b777STrond Myklebust nfs_zap_mapping(page->mapping->host, page->mapping); 161a301b777STrond Myklebust } 162a301b777STrond Myklebust 1631da177e4SLinus Torvalds /* We can set the PG_uptodate flag if we see that a write request 1641da177e4SLinus Torvalds * covers the full page. 1651da177e4SLinus Torvalds */ 1661da177e4SLinus Torvalds static void nfs_mark_uptodate(struct page *page, unsigned int base, unsigned int count) 1671da177e4SLinus Torvalds { 1681da177e4SLinus Torvalds if (PageUptodate(page)) 1691da177e4SLinus Torvalds return; 1701da177e4SLinus Torvalds if (base != 0) 1711da177e4SLinus Torvalds return; 17249a70f27STrond Myklebust if (count != nfs_page_length(page)) 1731da177e4SLinus Torvalds return; 17449a70f27STrond Myklebust if (count != PAGE_CACHE_SIZE) 1751da177e4SLinus Torvalds memclear_highpage_flush(page, count, PAGE_CACHE_SIZE - count); 1761da177e4SLinus Torvalds SetPageUptodate(page); 1771da177e4SLinus Torvalds } 1781da177e4SLinus Torvalds 179e21195a7STrond Myklebust static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page, 1801da177e4SLinus Torvalds unsigned int offset, unsigned int count) 1811da177e4SLinus Torvalds { 1821da177e4SLinus Torvalds struct nfs_page *req; 183e21195a7STrond Myklebust int ret; 1841da177e4SLinus Torvalds 185e21195a7STrond Myklebust for (;;) { 186e21195a7STrond Myklebust req = nfs_update_request(ctx, page, offset, count); 187e21195a7STrond Myklebust if (!IS_ERR(req)) 188e21195a7STrond Myklebust break; 189e21195a7STrond Myklebust ret = PTR_ERR(req); 190e21195a7STrond Myklebust if (ret != -EBUSY) 191e21195a7STrond Myklebust return ret; 192e21195a7STrond Myklebust ret = nfs_wb_page(page->mapping->host, page); 193e21195a7STrond Myklebust if (ret != 0) 194e21195a7STrond Myklebust return ret; 195e21195a7STrond Myklebust } 1961da177e4SLinus Torvalds /* Update file length */ 1971da177e4SLinus Torvalds nfs_grow_file(page, offset, count); 1981da177e4SLinus Torvalds /* Set the PG_uptodate flag? */ 1991da177e4SLinus Torvalds nfs_mark_uptodate(page, offset, count); 2001da177e4SLinus Torvalds nfs_unlock_request(req); 201abd3e641STrond Myklebust return 0; 2021da177e4SLinus Torvalds } 2031da177e4SLinus Torvalds 2041da177e4SLinus Torvalds static int wb_priority(struct writeback_control *wbc) 2051da177e4SLinus Torvalds { 2061da177e4SLinus Torvalds if (wbc->for_reclaim) 2071da177e4SLinus Torvalds return FLUSH_HIGHPRI; 2081da177e4SLinus Torvalds if (wbc->for_kupdate) 2091da177e4SLinus Torvalds return FLUSH_LOWPRI; 2101da177e4SLinus Torvalds return 0; 2111da177e4SLinus Torvalds } 2121da177e4SLinus Torvalds 2131da177e4SLinus Torvalds /* 214e261f51fSTrond Myklebust * Find an associated nfs write request, and prepare to flush it out 215e261f51fSTrond Myklebust * Returns 1 if there was no write request, or if the request was 216e261f51fSTrond Myklebust * already tagged by nfs_set_page_dirty.Returns 0 if the request 217e261f51fSTrond Myklebust * was not tagged. 218e261f51fSTrond Myklebust * May also return an error if the user signalled nfs_wait_on_request(). 219e261f51fSTrond Myklebust */ 220e261f51fSTrond Myklebust static int nfs_page_mark_flush(struct page *page) 221e261f51fSTrond Myklebust { 222e261f51fSTrond Myklebust struct nfs_page *req; 223e261f51fSTrond Myklebust spinlock_t *req_lock = &NFS_I(page->mapping->host)->req_lock; 224e261f51fSTrond Myklebust int ret; 225e261f51fSTrond Myklebust 226e261f51fSTrond Myklebust spin_lock(req_lock); 227e261f51fSTrond Myklebust for(;;) { 228e261f51fSTrond Myklebust req = nfs_page_find_request_locked(page); 229e261f51fSTrond Myklebust if (req == NULL) { 230e261f51fSTrond Myklebust spin_unlock(req_lock); 231e261f51fSTrond Myklebust return 1; 232e261f51fSTrond Myklebust } 233e261f51fSTrond Myklebust if (nfs_lock_request_dontget(req)) 234e261f51fSTrond Myklebust break; 235e261f51fSTrond Myklebust /* Note: If we hold the page lock, as is the case in nfs_writepage, 236e261f51fSTrond Myklebust * then the call to nfs_lock_request_dontget() will always 237e261f51fSTrond Myklebust * succeed provided that someone hasn't already marked the 238e261f51fSTrond Myklebust * request as dirty (in which case we don't care). 239e261f51fSTrond Myklebust */ 240e261f51fSTrond Myklebust spin_unlock(req_lock); 241e261f51fSTrond Myklebust ret = nfs_wait_on_request(req); 242e261f51fSTrond Myklebust nfs_release_request(req); 243e261f51fSTrond Myklebust if (ret != 0) 244e261f51fSTrond Myklebust return ret; 245e261f51fSTrond Myklebust spin_lock(req_lock); 246e261f51fSTrond Myklebust } 247e261f51fSTrond Myklebust spin_unlock(req_lock); 24861822ab5STrond Myklebust if (test_and_set_bit(PG_FLUSHING, &req->wb_flags) == 0) { 249e261f51fSTrond Myklebust nfs_mark_request_dirty(req); 25061822ab5STrond Myklebust set_page_writeback(page); 25161822ab5STrond Myklebust } 252e261f51fSTrond Myklebust ret = test_bit(PG_NEED_FLUSH, &req->wb_flags); 253e261f51fSTrond Myklebust nfs_unlock_request(req); 254e261f51fSTrond Myklebust return ret; 255e261f51fSTrond Myklebust } 256e261f51fSTrond Myklebust 257e261f51fSTrond Myklebust /* 2581da177e4SLinus Torvalds * Write an mmapped page to the server. 2591da177e4SLinus Torvalds */ 2604d770ccfSTrond Myklebust static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc) 2611da177e4SLinus Torvalds { 2621da177e4SLinus Torvalds struct nfs_open_context *ctx; 2631da177e4SLinus Torvalds struct inode *inode = page->mapping->host; 26449a70f27STrond Myklebust unsigned offset; 265e261f51fSTrond Myklebust int err; 2661da177e4SLinus Torvalds 26791d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE); 26891d5b470SChuck Lever nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1); 26991d5b470SChuck Lever 270e261f51fSTrond Myklebust err = nfs_page_mark_flush(page); 271e261f51fSTrond Myklebust if (err <= 0) 2721a54533eSTrond Myklebust goto out; 273e261f51fSTrond Myklebust err = 0; 27449a70f27STrond Myklebust offset = nfs_page_length(page); 27549a70f27STrond Myklebust if (!offset) 2761da177e4SLinus Torvalds goto out; 27749a70f27STrond Myklebust 278d530838bSTrond Myklebust ctx = nfs_find_open_context(inode, NULL, FMODE_WRITE); 2791da177e4SLinus Torvalds if (ctx == NULL) { 2801da177e4SLinus Torvalds err = -EBADF; 2811da177e4SLinus Torvalds goto out; 2821da177e4SLinus Torvalds } 283e21195a7STrond Myklebust err = nfs_writepage_setup(ctx, page, 0, offset); 284200baa21STrond Myklebust put_nfs_open_context(ctx); 285e261f51fSTrond Myklebust if (err != 0) 286e261f51fSTrond Myklebust goto out; 287e261f51fSTrond Myklebust err = nfs_page_mark_flush(page); 288e261f51fSTrond Myklebust if (err > 0) 289e261f51fSTrond Myklebust err = 0; 290200baa21STrond Myklebust out: 291abd3e641STrond Myklebust if (!wbc->for_writepages) 29202241bc4STrond Myklebust nfs_flush_mapping(page->mapping, wbc, FLUSH_STABLE|wb_priority(wbc)); 2934d770ccfSTrond Myklebust return err; 2944d770ccfSTrond Myklebust } 2954d770ccfSTrond Myklebust 2964d770ccfSTrond Myklebust int nfs_writepage(struct page *page, struct writeback_control *wbc) 2974d770ccfSTrond Myklebust { 2984d770ccfSTrond Myklebust int err; 2994d770ccfSTrond Myklebust 3004d770ccfSTrond Myklebust err = nfs_writepage_locked(page, wbc); 3011da177e4SLinus Torvalds unlock_page(page); 3021da177e4SLinus Torvalds return err; 3031da177e4SLinus Torvalds } 3041da177e4SLinus Torvalds 3051da177e4SLinus Torvalds /* 3061da177e4SLinus Torvalds * Note: causes nfs_update_request() to block on the assumption 3071da177e4SLinus Torvalds * that the writeback is generated due to memory pressure. 3081da177e4SLinus Torvalds */ 3091da177e4SLinus Torvalds int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc) 3101da177e4SLinus Torvalds { 3111da177e4SLinus Torvalds struct backing_dev_info *bdi = mapping->backing_dev_info; 3121da177e4SLinus Torvalds struct inode *inode = mapping->host; 3131da177e4SLinus Torvalds int err; 3141da177e4SLinus Torvalds 31591d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES); 31691d5b470SChuck Lever 3171da177e4SLinus Torvalds err = generic_writepages(mapping, wbc); 3181da177e4SLinus Torvalds if (err) 3191da177e4SLinus Torvalds return err; 3201da177e4SLinus Torvalds while (test_and_set_bit(BDI_write_congested, &bdi->state) != 0) { 3211da177e4SLinus Torvalds if (wbc->nonblocking) 3221da177e4SLinus Torvalds return 0; 3231da177e4SLinus Torvalds nfs_wait_on_write_congestion(mapping, 0); 3241da177e4SLinus Torvalds } 32528c6925fSTrond Myklebust err = nfs_flush_mapping(mapping, wbc, wb_priority(wbc)); 3261da177e4SLinus Torvalds if (err < 0) 3271da177e4SLinus Torvalds goto out; 32891d5b470SChuck Lever nfs_add_stats(inode, NFSIOS_WRITEPAGES, err); 3291da177e4SLinus Torvalds err = 0; 3301da177e4SLinus Torvalds out: 3311da177e4SLinus Torvalds clear_bit(BDI_write_congested, &bdi->state); 3321da177e4SLinus Torvalds wake_up_all(&nfs_write_congestion); 3333fcfab16SAndrew Morton congestion_end(WRITE); 3341da177e4SLinus Torvalds return err; 3351da177e4SLinus Torvalds } 3361da177e4SLinus Torvalds 3371da177e4SLinus Torvalds /* 3381da177e4SLinus Torvalds * Insert a write request into an inode 3391da177e4SLinus Torvalds */ 3401da177e4SLinus Torvalds static int nfs_inode_add_request(struct inode *inode, struct nfs_page *req) 3411da177e4SLinus Torvalds { 3421da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 3431da177e4SLinus Torvalds int error; 3441da177e4SLinus Torvalds 3451da177e4SLinus Torvalds error = radix_tree_insert(&nfsi->nfs_page_tree, req->wb_index, req); 3461da177e4SLinus Torvalds BUG_ON(error == -EEXIST); 3471da177e4SLinus Torvalds if (error) 3481da177e4SLinus Torvalds return error; 3491da177e4SLinus Torvalds if (!nfsi->npages) { 3501da177e4SLinus Torvalds igrab(inode); 3511da177e4SLinus Torvalds nfs_begin_data_update(inode); 3521da177e4SLinus Torvalds if (nfs_have_delegation(inode, FMODE_WRITE)) 3531da177e4SLinus Torvalds nfsi->change_attr++; 3541da177e4SLinus Torvalds } 355deb7d638STrond Myklebust SetPagePrivate(req->wb_page); 356277459d2STrond Myklebust set_page_private(req->wb_page, (unsigned long)req); 3571da177e4SLinus Torvalds nfsi->npages++; 3581da177e4SLinus Torvalds atomic_inc(&req->wb_count); 3591da177e4SLinus Torvalds return 0; 3601da177e4SLinus Torvalds } 3611da177e4SLinus Torvalds 3621da177e4SLinus Torvalds /* 3631da177e4SLinus Torvalds * Insert a write request into an inode 3641da177e4SLinus Torvalds */ 3651da177e4SLinus Torvalds static void nfs_inode_remove_request(struct nfs_page *req) 3661da177e4SLinus Torvalds { 3671da177e4SLinus Torvalds struct inode *inode = req->wb_context->dentry->d_inode; 3681da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 3691da177e4SLinus Torvalds 3701da177e4SLinus Torvalds BUG_ON (!NFS_WBACK_BUSY(req)); 3711da177e4SLinus Torvalds 3721da177e4SLinus Torvalds spin_lock(&nfsi->req_lock); 373277459d2STrond Myklebust set_page_private(req->wb_page, 0); 374deb7d638STrond Myklebust ClearPagePrivate(req->wb_page); 3751da177e4SLinus Torvalds radix_tree_delete(&nfsi->nfs_page_tree, req->wb_index); 3761da177e4SLinus Torvalds nfsi->npages--; 3771da177e4SLinus Torvalds if (!nfsi->npages) { 3781da177e4SLinus Torvalds spin_unlock(&nfsi->req_lock); 379951a143bSTrond Myklebust nfs_end_data_update(inode); 3801da177e4SLinus Torvalds iput(inode); 3811da177e4SLinus Torvalds } else 3821da177e4SLinus Torvalds spin_unlock(&nfsi->req_lock); 3831da177e4SLinus Torvalds nfs_clear_request(req); 3841da177e4SLinus Torvalds nfs_release_request(req); 3851da177e4SLinus Torvalds } 3861da177e4SLinus Torvalds 3871da177e4SLinus Torvalds /* 3881da177e4SLinus Torvalds * Add a request to the inode's dirty list. 3891da177e4SLinus Torvalds */ 3901da177e4SLinus Torvalds static void 3911da177e4SLinus Torvalds nfs_mark_request_dirty(struct nfs_page *req) 3921da177e4SLinus Torvalds { 3931da177e4SLinus Torvalds struct inode *inode = req->wb_context->dentry->d_inode; 3941da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 3951da177e4SLinus Torvalds 3961da177e4SLinus Torvalds spin_lock(&nfsi->req_lock); 3973da28eb1STrond Myklebust radix_tree_tag_set(&nfsi->nfs_page_tree, 3983da28eb1STrond Myklebust req->wb_index, NFS_PAGE_TAG_DIRTY); 3991da177e4SLinus Torvalds nfs_list_add_request(req, &nfsi->dirty); 4001da177e4SLinus Torvalds nfsi->ndirty++; 4011da177e4SLinus Torvalds spin_unlock(&nfsi->req_lock); 402a1803044STrond Myklebust __mark_inode_dirty(inode, I_DIRTY_PAGES); 4031da177e4SLinus Torvalds } 4041da177e4SLinus Torvalds 40561822ab5STrond Myklebust static void 40661822ab5STrond Myklebust nfs_redirty_request(struct nfs_page *req) 40761822ab5STrond Myklebust { 40861822ab5STrond Myklebust clear_bit(PG_FLUSHING, &req->wb_flags); 40961822ab5STrond Myklebust __set_page_dirty_nobuffers(req->wb_page); 41061822ab5STrond Myklebust } 41161822ab5STrond Myklebust 4121da177e4SLinus Torvalds /* 4131da177e4SLinus Torvalds * Check if a request is dirty 4141da177e4SLinus Torvalds */ 4151da177e4SLinus Torvalds static inline int 4161da177e4SLinus Torvalds nfs_dirty_request(struct nfs_page *req) 4171da177e4SLinus Torvalds { 418e261f51fSTrond Myklebust return test_bit(PG_FLUSHING, &req->wb_flags) == 0; 4191da177e4SLinus Torvalds } 4201da177e4SLinus Torvalds 4211da177e4SLinus Torvalds #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) 4221da177e4SLinus Torvalds /* 4231da177e4SLinus Torvalds * Add a request to the inode's commit list. 4241da177e4SLinus Torvalds */ 4251da177e4SLinus Torvalds static void 4261da177e4SLinus Torvalds nfs_mark_request_commit(struct nfs_page *req) 4271da177e4SLinus Torvalds { 4281da177e4SLinus Torvalds struct inode *inode = req->wb_context->dentry->d_inode; 4291da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 4301da177e4SLinus Torvalds 4311da177e4SLinus Torvalds spin_lock(&nfsi->req_lock); 4321da177e4SLinus Torvalds nfs_list_add_request(req, &nfsi->commit); 4331da177e4SLinus Torvalds nfsi->ncommit++; 4341da177e4SLinus Torvalds spin_unlock(&nfsi->req_lock); 435fd39fc85SChristoph Lameter inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); 436a1803044STrond Myklebust __mark_inode_dirty(inode, I_DIRTY_DATASYNC); 4371da177e4SLinus Torvalds } 4381da177e4SLinus Torvalds #endif 4391da177e4SLinus Torvalds 4401da177e4SLinus Torvalds /* 4411da177e4SLinus Torvalds * Wait for a request to complete. 4421da177e4SLinus Torvalds * 4431da177e4SLinus Torvalds * Interruptible by signals only if mounted with intr flag. 4441da177e4SLinus Torvalds */ 445c42de9ddSTrond Myklebust static int nfs_wait_on_requests_locked(struct inode *inode, unsigned long idx_start, unsigned int npages) 4461da177e4SLinus Torvalds { 4471da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 4481da177e4SLinus Torvalds struct nfs_page *req; 4491da177e4SLinus Torvalds unsigned long idx_end, next; 4501da177e4SLinus Torvalds unsigned int res = 0; 4511da177e4SLinus Torvalds int error; 4521da177e4SLinus Torvalds 4531da177e4SLinus Torvalds if (npages == 0) 4541da177e4SLinus Torvalds idx_end = ~0; 4551da177e4SLinus Torvalds else 4561da177e4SLinus Torvalds idx_end = idx_start + npages - 1; 4571da177e4SLinus Torvalds 4581da177e4SLinus Torvalds next = idx_start; 459c6a556b8STrond Myklebust while (radix_tree_gang_lookup_tag(&nfsi->nfs_page_tree, (void **)&req, next, 1, NFS_PAGE_TAG_WRITEBACK)) { 4601da177e4SLinus Torvalds if (req->wb_index > idx_end) 4611da177e4SLinus Torvalds break; 4621da177e4SLinus Torvalds 4631da177e4SLinus Torvalds next = req->wb_index + 1; 464c6a556b8STrond Myklebust BUG_ON(!NFS_WBACK_BUSY(req)); 4651da177e4SLinus Torvalds 4661da177e4SLinus Torvalds atomic_inc(&req->wb_count); 4671da177e4SLinus Torvalds spin_unlock(&nfsi->req_lock); 4681da177e4SLinus Torvalds error = nfs_wait_on_request(req); 4691da177e4SLinus Torvalds nfs_release_request(req); 470c42de9ddSTrond Myklebust spin_lock(&nfsi->req_lock); 4711da177e4SLinus Torvalds if (error < 0) 4721da177e4SLinus Torvalds return error; 4731da177e4SLinus Torvalds res++; 4741da177e4SLinus Torvalds } 4751da177e4SLinus Torvalds return res; 4761da177e4SLinus Torvalds } 4771da177e4SLinus Torvalds 47883715ad5STrond Myklebust static void nfs_cancel_dirty_list(struct list_head *head) 479d2ccddf0STrond Myklebust { 480d2ccddf0STrond Myklebust struct nfs_page *req; 481d2ccddf0STrond Myklebust while(!list_empty(head)) { 482d2ccddf0STrond Myklebust req = nfs_list_entry(head->next); 483d2ccddf0STrond Myklebust nfs_list_remove_request(req); 484d2ccddf0STrond Myklebust nfs_inode_remove_request(req); 485d2ccddf0STrond Myklebust nfs_clear_page_writeback(req); 486d2ccddf0STrond Myklebust } 487d2ccddf0STrond Myklebust } 488d2ccddf0STrond Myklebust 48983715ad5STrond Myklebust static void nfs_cancel_commit_list(struct list_head *head) 49083715ad5STrond Myklebust { 49183715ad5STrond Myklebust struct nfs_page *req; 49283715ad5STrond Myklebust 49383715ad5STrond Myklebust while(!list_empty(head)) { 49483715ad5STrond Myklebust req = nfs_list_entry(head->next); 495b6dff26aSTrond Myklebust dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); 49683715ad5STrond Myklebust nfs_list_remove_request(req); 49783715ad5STrond Myklebust nfs_inode_remove_request(req); 498b6dff26aSTrond Myklebust nfs_unlock_request(req); 49983715ad5STrond Myklebust } 50083715ad5STrond Myklebust } 50183715ad5STrond Myklebust 5021da177e4SLinus Torvalds #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) 5031da177e4SLinus Torvalds /* 5041da177e4SLinus Torvalds * nfs_scan_commit - Scan an inode for commit requests 5051da177e4SLinus Torvalds * @inode: NFS inode to scan 5061da177e4SLinus Torvalds * @dst: destination list 5071da177e4SLinus Torvalds * @idx_start: lower bound of page->index to scan. 5081da177e4SLinus Torvalds * @npages: idx_start + npages sets the upper bound to scan. 5091da177e4SLinus Torvalds * 5101da177e4SLinus Torvalds * Moves requests from the inode's 'commit' request list. 5111da177e4SLinus Torvalds * The requests are *not* checked to ensure that they form a contiguous set. 5121da177e4SLinus Torvalds */ 5131da177e4SLinus Torvalds static int 5141da177e4SLinus Torvalds nfs_scan_commit(struct inode *inode, struct list_head *dst, unsigned long idx_start, unsigned int npages) 5151da177e4SLinus Torvalds { 5161da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 5173da28eb1STrond Myklebust int res = 0; 5183da28eb1STrond Myklebust 5193da28eb1STrond Myklebust if (nfsi->ncommit != 0) { 520d2ccddf0STrond Myklebust res = nfs_scan_list(nfsi, &nfsi->commit, dst, idx_start, npages); 5211da177e4SLinus Torvalds nfsi->ncommit -= res; 5221da177e4SLinus Torvalds if ((nfsi->ncommit == 0) != list_empty(&nfsi->commit)) 5231da177e4SLinus Torvalds printk(KERN_ERR "NFS: desynchronized value of nfs_i.ncommit.\n"); 5243da28eb1STrond Myklebust } 5251da177e4SLinus Torvalds return res; 5261da177e4SLinus Torvalds } 527c42de9ddSTrond Myklebust #else 528c42de9ddSTrond Myklebust static inline int nfs_scan_commit(struct inode *inode, struct list_head *dst, unsigned long idx_start, unsigned int npages) 529c42de9ddSTrond Myklebust { 530c42de9ddSTrond Myklebust return 0; 531c42de9ddSTrond Myklebust } 5321da177e4SLinus Torvalds #endif 5331da177e4SLinus Torvalds 5341da177e4SLinus Torvalds static int nfs_wait_on_write_congestion(struct address_space *mapping, int intr) 5351da177e4SLinus Torvalds { 5361da177e4SLinus Torvalds struct backing_dev_info *bdi = mapping->backing_dev_info; 5371da177e4SLinus Torvalds DEFINE_WAIT(wait); 5381da177e4SLinus Torvalds int ret = 0; 5391da177e4SLinus Torvalds 5401da177e4SLinus Torvalds might_sleep(); 5411da177e4SLinus Torvalds 5421da177e4SLinus Torvalds if (!bdi_write_congested(bdi)) 5431da177e4SLinus Torvalds return 0; 54491d5b470SChuck Lever 54591d5b470SChuck Lever nfs_inc_stats(mapping->host, NFSIOS_CONGESTIONWAIT); 54691d5b470SChuck Lever 5471da177e4SLinus Torvalds if (intr) { 5481da177e4SLinus Torvalds struct rpc_clnt *clnt = NFS_CLIENT(mapping->host); 5491da177e4SLinus Torvalds sigset_t oldset; 5501da177e4SLinus Torvalds 5511da177e4SLinus Torvalds rpc_clnt_sigmask(clnt, &oldset); 5521da177e4SLinus Torvalds prepare_to_wait(&nfs_write_congestion, &wait, TASK_INTERRUPTIBLE); 5531da177e4SLinus Torvalds if (bdi_write_congested(bdi)) { 5541da177e4SLinus Torvalds if (signalled()) 5551da177e4SLinus Torvalds ret = -ERESTARTSYS; 5561da177e4SLinus Torvalds else 5571da177e4SLinus Torvalds schedule(); 5581da177e4SLinus Torvalds } 5591da177e4SLinus Torvalds rpc_clnt_sigunmask(clnt, &oldset); 5601da177e4SLinus Torvalds } else { 5611da177e4SLinus Torvalds prepare_to_wait(&nfs_write_congestion, &wait, TASK_UNINTERRUPTIBLE); 5621da177e4SLinus Torvalds if (bdi_write_congested(bdi)) 5631da177e4SLinus Torvalds schedule(); 5641da177e4SLinus Torvalds } 5651da177e4SLinus Torvalds finish_wait(&nfs_write_congestion, &wait); 5661da177e4SLinus Torvalds return ret; 5671da177e4SLinus Torvalds } 5681da177e4SLinus Torvalds 5691da177e4SLinus Torvalds 5701da177e4SLinus Torvalds /* 5711da177e4SLinus Torvalds * Try to update any existing write request, or create one if there is none. 5721da177e4SLinus Torvalds * In order to match, the request's credentials must match those of 5731da177e4SLinus Torvalds * the calling process. 5741da177e4SLinus Torvalds * 5751da177e4SLinus Torvalds * Note: Should always be called with the Page Lock held! 5761da177e4SLinus Torvalds */ 5771da177e4SLinus Torvalds static struct nfs_page * nfs_update_request(struct nfs_open_context* ctx, 578e21195a7STrond Myklebust struct page *page, unsigned int offset, unsigned int bytes) 5791da177e4SLinus Torvalds { 580e21195a7STrond Myklebust struct inode *inode = page->mapping->host; 5811da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 5821da177e4SLinus Torvalds struct nfs_page *req, *new = NULL; 5831da177e4SLinus Torvalds unsigned long rqend, end; 5841da177e4SLinus Torvalds 5851da177e4SLinus Torvalds end = offset + bytes; 5861da177e4SLinus Torvalds 587e21195a7STrond Myklebust if (nfs_wait_on_write_congestion(page->mapping, NFS_SERVER(inode)->flags & NFS_MOUNT_INTR)) 5881da177e4SLinus Torvalds return ERR_PTR(-ERESTARTSYS); 5891da177e4SLinus Torvalds for (;;) { 5901da177e4SLinus Torvalds /* Loop over all inode entries and see if we find 5911da177e4SLinus Torvalds * A request for the page we wish to update 5921da177e4SLinus Torvalds */ 5931da177e4SLinus Torvalds spin_lock(&nfsi->req_lock); 594277459d2STrond Myklebust req = nfs_page_find_request_locked(page); 5951da177e4SLinus Torvalds if (req) { 5961da177e4SLinus Torvalds if (!nfs_lock_request_dontget(req)) { 5971da177e4SLinus Torvalds int error; 598277459d2STrond Myklebust 5991da177e4SLinus Torvalds spin_unlock(&nfsi->req_lock); 6001da177e4SLinus Torvalds error = nfs_wait_on_request(req); 6011da177e4SLinus Torvalds nfs_release_request(req); 6021dd594b2SNeil Brown if (error < 0) { 6031dd594b2SNeil Brown if (new) 6041dd594b2SNeil Brown nfs_release_request(new); 6051da177e4SLinus Torvalds return ERR_PTR(error); 6061dd594b2SNeil Brown } 6071da177e4SLinus Torvalds continue; 6081da177e4SLinus Torvalds } 6091da177e4SLinus Torvalds spin_unlock(&nfsi->req_lock); 6101da177e4SLinus Torvalds if (new) 6111da177e4SLinus Torvalds nfs_release_request(new); 6121da177e4SLinus Torvalds break; 6131da177e4SLinus Torvalds } 6141da177e4SLinus Torvalds 6151da177e4SLinus Torvalds if (new) { 6161da177e4SLinus Torvalds int error; 6171da177e4SLinus Torvalds nfs_lock_request_dontget(new); 6181da177e4SLinus Torvalds error = nfs_inode_add_request(inode, new); 6191da177e4SLinus Torvalds if (error) { 6201da177e4SLinus Torvalds spin_unlock(&nfsi->req_lock); 6211da177e4SLinus Torvalds nfs_unlock_request(new); 6221da177e4SLinus Torvalds return ERR_PTR(error); 6231da177e4SLinus Torvalds } 6241da177e4SLinus Torvalds spin_unlock(&nfsi->req_lock); 6251da177e4SLinus Torvalds return new; 6261da177e4SLinus Torvalds } 6271da177e4SLinus Torvalds spin_unlock(&nfsi->req_lock); 6281da177e4SLinus Torvalds 6291da177e4SLinus Torvalds new = nfs_create_request(ctx, inode, page, offset, bytes); 6301da177e4SLinus Torvalds if (IS_ERR(new)) 6311da177e4SLinus Torvalds return new; 6321da177e4SLinus Torvalds } 6331da177e4SLinus Torvalds 6341da177e4SLinus Torvalds /* We have a request for our page. 6351da177e4SLinus Torvalds * If the creds don't match, or the 6361da177e4SLinus Torvalds * page addresses don't match, 6371da177e4SLinus Torvalds * tell the caller to wait on the conflicting 6381da177e4SLinus Torvalds * request. 6391da177e4SLinus Torvalds */ 6401da177e4SLinus Torvalds rqend = req->wb_offset + req->wb_bytes; 6411da177e4SLinus Torvalds if (req->wb_context != ctx 6421da177e4SLinus Torvalds || req->wb_page != page 6431da177e4SLinus Torvalds || !nfs_dirty_request(req) 6441da177e4SLinus Torvalds || offset > rqend || end < req->wb_offset) { 6451da177e4SLinus Torvalds nfs_unlock_request(req); 6461da177e4SLinus Torvalds return ERR_PTR(-EBUSY); 6471da177e4SLinus Torvalds } 6481da177e4SLinus Torvalds 6491da177e4SLinus Torvalds /* Okay, the request matches. Update the region */ 6501da177e4SLinus Torvalds if (offset < req->wb_offset) { 6511da177e4SLinus Torvalds req->wb_offset = offset; 6521da177e4SLinus Torvalds req->wb_pgbase = offset; 6531da177e4SLinus Torvalds req->wb_bytes = rqend - req->wb_offset; 6541da177e4SLinus Torvalds } 6551da177e4SLinus Torvalds 6561da177e4SLinus Torvalds if (end > rqend) 6571da177e4SLinus Torvalds req->wb_bytes = end - req->wb_offset; 6581da177e4SLinus Torvalds 6591da177e4SLinus Torvalds return req; 6601da177e4SLinus Torvalds } 6611da177e4SLinus Torvalds 6621da177e4SLinus Torvalds int nfs_flush_incompatible(struct file *file, struct page *page) 6631da177e4SLinus Torvalds { 6641da177e4SLinus Torvalds struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data; 6651da177e4SLinus Torvalds struct nfs_page *req; 6661a54533eSTrond Myklebust int do_flush, status; 6671da177e4SLinus Torvalds /* 6681da177e4SLinus Torvalds * Look for a request corresponding to this page. If there 6691da177e4SLinus Torvalds * is one, and it belongs to another file, we flush it out 6701da177e4SLinus Torvalds * before we try to copy anything into the page. Do this 6711da177e4SLinus Torvalds * due to the lack of an ACCESS-type call in NFSv2. 6721da177e4SLinus Torvalds * Also do the same if we find a request from an existing 6731da177e4SLinus Torvalds * dropped page. 6741da177e4SLinus Torvalds */ 6751a54533eSTrond Myklebust do { 676277459d2STrond Myklebust req = nfs_page_find_request(page); 6771a54533eSTrond Myklebust if (req == NULL) 6781a54533eSTrond Myklebust return 0; 6791a54533eSTrond Myklebust do_flush = req->wb_page != page || req->wb_context != ctx 680e261f51fSTrond Myklebust || !nfs_dirty_request(req); 6811da177e4SLinus Torvalds nfs_release_request(req); 6821a54533eSTrond Myklebust if (!do_flush) 6831a54533eSTrond Myklebust return 0; 684277459d2STrond Myklebust status = nfs_wb_page(page->mapping->host, page); 6851a54533eSTrond Myklebust } while (status == 0); 6861a54533eSTrond Myklebust return status; 6871da177e4SLinus Torvalds } 6881da177e4SLinus Torvalds 6891da177e4SLinus Torvalds /* 6901da177e4SLinus Torvalds * Update and possibly write a cached page of an NFS file. 6911da177e4SLinus Torvalds * 6921da177e4SLinus Torvalds * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad 6931da177e4SLinus Torvalds * things with a page scheduled for an RPC call (e.g. invalidate it). 6941da177e4SLinus Torvalds */ 6951da177e4SLinus Torvalds int nfs_updatepage(struct file *file, struct page *page, 6961da177e4SLinus Torvalds unsigned int offset, unsigned int count) 6971da177e4SLinus Torvalds { 6981da177e4SLinus Torvalds struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data; 6991da177e4SLinus Torvalds struct inode *inode = page->mapping->host; 7001da177e4SLinus Torvalds int status = 0; 7011da177e4SLinus Torvalds 70291d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE); 70391d5b470SChuck Lever 7041da177e4SLinus Torvalds dprintk("NFS: nfs_updatepage(%s/%s %d@%Ld)\n", 70501cce933SJosef "Jeff" Sipek file->f_path.dentry->d_parent->d_name.name, 70601cce933SJosef "Jeff" Sipek file->f_path.dentry->d_name.name, count, 7070bbacc40SChuck Lever (long long)(page_offset(page) +offset)); 7081da177e4SLinus Torvalds 7091da177e4SLinus Torvalds /* If we're not using byte range locks, and we know the page 7101da177e4SLinus Torvalds * is entirely in cache, it may be more efficient to avoid 7111da177e4SLinus Torvalds * fragmenting write requests. 7121da177e4SLinus Torvalds */ 713ab0a3dbeSTrond Myklebust if (PageUptodate(page) && inode->i_flock == NULL && !(file->f_mode & O_SYNC)) { 71449a70f27STrond Myklebust count = max(count + offset, nfs_page_length(page)); 7151da177e4SLinus Torvalds offset = 0; 7161da177e4SLinus Torvalds } 7171da177e4SLinus Torvalds 718e21195a7STrond Myklebust status = nfs_writepage_setup(ctx, page, offset, count); 719e261f51fSTrond Myklebust __set_page_dirty_nobuffers(page); 7201da177e4SLinus Torvalds 7211da177e4SLinus Torvalds dprintk("NFS: nfs_updatepage returns %d (isize %Ld)\n", 7221da177e4SLinus Torvalds status, (long long)i_size_read(inode)); 7231da177e4SLinus Torvalds if (status < 0) 724a301b777STrond Myklebust nfs_set_pageerror(page); 7251da177e4SLinus Torvalds return status; 7261da177e4SLinus Torvalds } 7271da177e4SLinus Torvalds 7281da177e4SLinus Torvalds static void nfs_writepage_release(struct nfs_page *req) 7291da177e4SLinus Torvalds { 7301da177e4SLinus Torvalds end_page_writeback(req->wb_page); 7311da177e4SLinus Torvalds 7321da177e4SLinus Torvalds #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) 7331da177e4SLinus Torvalds if (!PageError(req->wb_page)) { 7341da177e4SLinus Torvalds if (NFS_NEED_RESCHED(req)) { 73561822ab5STrond Myklebust nfs_redirty_request(req); 7361da177e4SLinus Torvalds goto out; 7371da177e4SLinus Torvalds } else if (NFS_NEED_COMMIT(req)) { 7381da177e4SLinus Torvalds nfs_mark_request_commit(req); 7391da177e4SLinus Torvalds goto out; 7401da177e4SLinus Torvalds } 7411da177e4SLinus Torvalds } 7421da177e4SLinus Torvalds nfs_inode_remove_request(req); 7431da177e4SLinus Torvalds 7441da177e4SLinus Torvalds out: 7451da177e4SLinus Torvalds nfs_clear_commit(req); 7461da177e4SLinus Torvalds nfs_clear_reschedule(req); 7471da177e4SLinus Torvalds #else 7481da177e4SLinus Torvalds nfs_inode_remove_request(req); 7491da177e4SLinus Torvalds #endif 750c6a556b8STrond Myklebust nfs_clear_page_writeback(req); 7511da177e4SLinus Torvalds } 7521da177e4SLinus Torvalds 7531da177e4SLinus Torvalds static inline int flush_task_priority(int how) 7541da177e4SLinus Torvalds { 7551da177e4SLinus Torvalds switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) { 7561da177e4SLinus Torvalds case FLUSH_HIGHPRI: 7571da177e4SLinus Torvalds return RPC_PRIORITY_HIGH; 7581da177e4SLinus Torvalds case FLUSH_LOWPRI: 7591da177e4SLinus Torvalds return RPC_PRIORITY_LOW; 7601da177e4SLinus Torvalds } 7611da177e4SLinus Torvalds return RPC_PRIORITY_NORMAL; 7621da177e4SLinus Torvalds } 7631da177e4SLinus Torvalds 7641da177e4SLinus Torvalds /* 7651da177e4SLinus Torvalds * Set up the argument/result storage required for the RPC call. 7661da177e4SLinus Torvalds */ 7671da177e4SLinus Torvalds static void nfs_write_rpcsetup(struct nfs_page *req, 7681da177e4SLinus Torvalds struct nfs_write_data *data, 769788e7a89STrond Myklebust const struct rpc_call_ops *call_ops, 7701da177e4SLinus Torvalds unsigned int count, unsigned int offset, 7711da177e4SLinus Torvalds int how) 7721da177e4SLinus Torvalds { 7731da177e4SLinus Torvalds struct inode *inode; 774788e7a89STrond Myklebust int flags; 7751da177e4SLinus Torvalds 7761da177e4SLinus Torvalds /* Set up the RPC argument and reply structs 7771da177e4SLinus Torvalds * NB: take care not to mess about with data->commit et al. */ 7781da177e4SLinus Torvalds 7791da177e4SLinus Torvalds data->req = req; 7801da177e4SLinus Torvalds data->inode = inode = req->wb_context->dentry->d_inode; 7811da177e4SLinus Torvalds data->cred = req->wb_context->cred; 7821da177e4SLinus Torvalds 7831da177e4SLinus Torvalds data->args.fh = NFS_FH(inode); 7841da177e4SLinus Torvalds data->args.offset = req_offset(req) + offset; 7851da177e4SLinus Torvalds data->args.pgbase = req->wb_pgbase + offset; 7861da177e4SLinus Torvalds data->args.pages = data->pagevec; 7871da177e4SLinus Torvalds data->args.count = count; 7881da177e4SLinus Torvalds data->args.context = req->wb_context; 7891da177e4SLinus Torvalds 7901da177e4SLinus Torvalds data->res.fattr = &data->fattr; 7911da177e4SLinus Torvalds data->res.count = count; 7921da177e4SLinus Torvalds data->res.verf = &data->verf; 7930e574af1STrond Myklebust nfs_fattr_init(&data->fattr); 7941da177e4SLinus Torvalds 795788e7a89STrond Myklebust /* Set up the initial task struct. */ 796788e7a89STrond Myklebust flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; 797788e7a89STrond Myklebust rpc_init_task(&data->task, NFS_CLIENT(inode), flags, call_ops, data); 7981da177e4SLinus Torvalds NFS_PROTO(inode)->write_setup(data, how); 7991da177e4SLinus Torvalds 8001da177e4SLinus Torvalds data->task.tk_priority = flush_task_priority(how); 8011da177e4SLinus Torvalds data->task.tk_cookie = (unsigned long)inode; 8021da177e4SLinus Torvalds 803a3f565b1SChuck Lever dprintk("NFS: %5u initiated write call " 804a3f565b1SChuck Lever "(req %s/%Ld, %u bytes @ offset %Lu)\n", 8050bbacc40SChuck Lever data->task.tk_pid, 8061da177e4SLinus Torvalds inode->i_sb->s_id, 8071da177e4SLinus Torvalds (long long)NFS_FILEID(inode), 8081da177e4SLinus Torvalds count, 8091da177e4SLinus Torvalds (unsigned long long)data->args.offset); 8101da177e4SLinus Torvalds } 8111da177e4SLinus Torvalds 8121da177e4SLinus Torvalds static void nfs_execute_write(struct nfs_write_data *data) 8131da177e4SLinus Torvalds { 8141da177e4SLinus Torvalds struct rpc_clnt *clnt = NFS_CLIENT(data->inode); 8151da177e4SLinus Torvalds sigset_t oldset; 8161da177e4SLinus Torvalds 8171da177e4SLinus Torvalds rpc_clnt_sigmask(clnt, &oldset); 8181da177e4SLinus Torvalds rpc_execute(&data->task); 8191da177e4SLinus Torvalds rpc_clnt_sigunmask(clnt, &oldset); 8201da177e4SLinus Torvalds } 8211da177e4SLinus Torvalds 8221da177e4SLinus Torvalds /* 8231da177e4SLinus Torvalds * Generate multiple small requests to write out a single 8241da177e4SLinus Torvalds * contiguous dirty area on one page. 8251da177e4SLinus Torvalds */ 8267d46a49fSTrond Myklebust static int nfs_flush_multi(struct inode *inode, struct list_head *head, int how) 8271da177e4SLinus Torvalds { 8281da177e4SLinus Torvalds struct nfs_page *req = nfs_list_entry(head->next); 8291da177e4SLinus Torvalds struct page *page = req->wb_page; 8301da177e4SLinus Torvalds struct nfs_write_data *data; 831e9f7bee1STrond Myklebust size_t wsize = NFS_SERVER(inode)->wsize, nbytes; 832e9f7bee1STrond Myklebust unsigned int offset; 8331da177e4SLinus Torvalds int requests = 0; 8341da177e4SLinus Torvalds LIST_HEAD(list); 8351da177e4SLinus Torvalds 8361da177e4SLinus Torvalds nfs_list_remove_request(req); 8371da177e4SLinus Torvalds 8381da177e4SLinus Torvalds nbytes = req->wb_bytes; 839e9f7bee1STrond Myklebust do { 840e9f7bee1STrond Myklebust size_t len = min(nbytes, wsize); 841e9f7bee1STrond Myklebust 842e9f7bee1STrond Myklebust data = nfs_writedata_alloc(len); 8431da177e4SLinus Torvalds if (!data) 8441da177e4SLinus Torvalds goto out_bad; 8451da177e4SLinus Torvalds list_add(&data->pages, &list); 8461da177e4SLinus Torvalds requests++; 847e9f7bee1STrond Myklebust nbytes -= len; 848e9f7bee1STrond Myklebust } while (nbytes != 0); 8491da177e4SLinus Torvalds atomic_set(&req->wb_complete, requests); 8501da177e4SLinus Torvalds 8511da177e4SLinus Torvalds ClearPageError(page); 8521da177e4SLinus Torvalds offset = 0; 8531da177e4SLinus Torvalds nbytes = req->wb_bytes; 8541da177e4SLinus Torvalds do { 8551da177e4SLinus Torvalds data = list_entry(list.next, struct nfs_write_data, pages); 8561da177e4SLinus Torvalds list_del_init(&data->pages); 8571da177e4SLinus Torvalds 8581da177e4SLinus Torvalds data->pagevec[0] = page; 8591da177e4SLinus Torvalds 8601da177e4SLinus Torvalds if (nbytes > wsize) { 861788e7a89STrond Myklebust nfs_write_rpcsetup(req, data, &nfs_write_partial_ops, 862788e7a89STrond Myklebust wsize, offset, how); 8631da177e4SLinus Torvalds offset += wsize; 8641da177e4SLinus Torvalds nbytes -= wsize; 8651da177e4SLinus Torvalds } else { 866788e7a89STrond Myklebust nfs_write_rpcsetup(req, data, &nfs_write_partial_ops, 867788e7a89STrond Myklebust nbytes, offset, how); 8681da177e4SLinus Torvalds nbytes = 0; 8691da177e4SLinus Torvalds } 8701da177e4SLinus Torvalds nfs_execute_write(data); 8711da177e4SLinus Torvalds } while (nbytes != 0); 8721da177e4SLinus Torvalds 8731da177e4SLinus Torvalds return 0; 8741da177e4SLinus Torvalds 8751da177e4SLinus Torvalds out_bad: 8761da177e4SLinus Torvalds while (!list_empty(&list)) { 8771da177e4SLinus Torvalds data = list_entry(list.next, struct nfs_write_data, pages); 8781da177e4SLinus Torvalds list_del(&data->pages); 8798aca67f0STrond Myklebust nfs_writedata_release(data); 8801da177e4SLinus Torvalds } 88161822ab5STrond Myklebust nfs_redirty_request(req); 882c6a556b8STrond Myklebust nfs_clear_page_writeback(req); 8831da177e4SLinus Torvalds return -ENOMEM; 8841da177e4SLinus Torvalds } 8851da177e4SLinus Torvalds 8861da177e4SLinus Torvalds /* 8871da177e4SLinus Torvalds * Create an RPC task for the given write request and kick it. 8881da177e4SLinus Torvalds * The page must have been locked by the caller. 8891da177e4SLinus Torvalds * 8901da177e4SLinus Torvalds * It may happen that the page we're passed is not marked dirty. 8911da177e4SLinus Torvalds * This is the case if nfs_updatepage detects a conflicting request 8921da177e4SLinus Torvalds * that has been written but not committed. 8931da177e4SLinus Torvalds */ 8947d46a49fSTrond Myklebust static int nfs_flush_one(struct inode *inode, struct list_head *head, int how) 8951da177e4SLinus Torvalds { 8961da177e4SLinus Torvalds struct nfs_page *req; 8971da177e4SLinus Torvalds struct page **pages; 8981da177e4SLinus Torvalds struct nfs_write_data *data; 8991da177e4SLinus Torvalds unsigned int count; 9001da177e4SLinus Torvalds 901e9f7bee1STrond Myklebust data = nfs_writedata_alloc(NFS_SERVER(inode)->wsize); 9021da177e4SLinus Torvalds if (!data) 9031da177e4SLinus Torvalds goto out_bad; 9041da177e4SLinus Torvalds 9051da177e4SLinus Torvalds pages = data->pagevec; 9061da177e4SLinus Torvalds count = 0; 9071da177e4SLinus Torvalds while (!list_empty(head)) { 9081da177e4SLinus Torvalds req = nfs_list_entry(head->next); 9091da177e4SLinus Torvalds nfs_list_remove_request(req); 9101da177e4SLinus Torvalds nfs_list_add_request(req, &data->pages); 9111da177e4SLinus Torvalds ClearPageError(req->wb_page); 9121da177e4SLinus Torvalds *pages++ = req->wb_page; 9131da177e4SLinus Torvalds count += req->wb_bytes; 9141da177e4SLinus Torvalds } 9151da177e4SLinus Torvalds req = nfs_list_entry(data->pages.next); 9161da177e4SLinus Torvalds 9171da177e4SLinus Torvalds /* Set up the argument struct */ 918788e7a89STrond Myklebust nfs_write_rpcsetup(req, data, &nfs_write_full_ops, count, 0, how); 9191da177e4SLinus Torvalds 9201da177e4SLinus Torvalds nfs_execute_write(data); 9211da177e4SLinus Torvalds return 0; 9221da177e4SLinus Torvalds out_bad: 9231da177e4SLinus Torvalds while (!list_empty(head)) { 9241da177e4SLinus Torvalds struct nfs_page *req = nfs_list_entry(head->next); 9251da177e4SLinus Torvalds nfs_list_remove_request(req); 92661822ab5STrond Myklebust nfs_redirty_request(req); 927c6a556b8STrond Myklebust nfs_clear_page_writeback(req); 9281da177e4SLinus Torvalds } 9291da177e4SLinus Torvalds return -ENOMEM; 9301da177e4SLinus Torvalds } 9311da177e4SLinus Torvalds 9327d46a49fSTrond Myklebust static int nfs_flush_list(struct inode *inode, struct list_head *head, int npages, int how) 9331da177e4SLinus Torvalds { 9341da177e4SLinus Torvalds LIST_HEAD(one_request); 9357d46a49fSTrond Myklebust int (*flush_one)(struct inode *, struct list_head *, int); 9361da177e4SLinus Torvalds struct nfs_page *req; 9377d46a49fSTrond Myklebust int wpages = NFS_SERVER(inode)->wpages; 9387d46a49fSTrond Myklebust int wsize = NFS_SERVER(inode)->wsize; 9397d46a49fSTrond Myklebust int error; 9401da177e4SLinus Torvalds 9417d46a49fSTrond Myklebust flush_one = nfs_flush_one; 9427d46a49fSTrond Myklebust if (wsize < PAGE_CACHE_SIZE) 9437d46a49fSTrond Myklebust flush_one = nfs_flush_multi; 9447d46a49fSTrond Myklebust /* For single writes, FLUSH_STABLE is more efficient */ 9457d46a49fSTrond Myklebust if (npages <= wpages && npages == NFS_I(inode)->npages 9467d46a49fSTrond Myklebust && nfs_list_entry(head->next)->wb_bytes <= wsize) 9477d46a49fSTrond Myklebust how |= FLUSH_STABLE; 9487d46a49fSTrond Myklebust 9497d46a49fSTrond Myklebust do { 9507d46a49fSTrond Myklebust nfs_coalesce_requests(head, &one_request, wpages); 9511da177e4SLinus Torvalds req = nfs_list_entry(one_request.next); 9527d46a49fSTrond Myklebust error = flush_one(inode, &one_request, how); 9531da177e4SLinus Torvalds if (error < 0) 9547d46a49fSTrond Myklebust goto out_err; 9557d46a49fSTrond Myklebust } while (!list_empty(head)); 9567d46a49fSTrond Myklebust return 0; 9577d46a49fSTrond Myklebust out_err: 9581da177e4SLinus Torvalds while (!list_empty(head)) { 9591da177e4SLinus Torvalds req = nfs_list_entry(head->next); 9601da177e4SLinus Torvalds nfs_list_remove_request(req); 96161822ab5STrond Myklebust nfs_redirty_request(req); 962c6a556b8STrond Myklebust nfs_clear_page_writeback(req); 9631da177e4SLinus Torvalds } 9641da177e4SLinus Torvalds return error; 9651da177e4SLinus Torvalds } 9661da177e4SLinus Torvalds 9671da177e4SLinus Torvalds /* 9681da177e4SLinus Torvalds * Handle a write reply that flushed part of a page. 9691da177e4SLinus Torvalds */ 970788e7a89STrond Myklebust static void nfs_writeback_done_partial(struct rpc_task *task, void *calldata) 9711da177e4SLinus Torvalds { 972788e7a89STrond Myklebust struct nfs_write_data *data = calldata; 9731da177e4SLinus Torvalds struct nfs_page *req = data->req; 9741da177e4SLinus Torvalds struct page *page = req->wb_page; 9751da177e4SLinus Torvalds 9761da177e4SLinus Torvalds dprintk("NFS: write (%s/%Ld %d@%Ld)", 9771da177e4SLinus Torvalds req->wb_context->dentry->d_inode->i_sb->s_id, 9781da177e4SLinus Torvalds (long long)NFS_FILEID(req->wb_context->dentry->d_inode), 9791da177e4SLinus Torvalds req->wb_bytes, 9801da177e4SLinus Torvalds (long long)req_offset(req)); 9811da177e4SLinus Torvalds 982788e7a89STrond Myklebust if (nfs_writeback_done(task, data) != 0) 983788e7a89STrond Myklebust return; 984788e7a89STrond Myklebust 985788e7a89STrond Myklebust if (task->tk_status < 0) { 986a301b777STrond Myklebust nfs_set_pageerror(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) { 1043a301b777STrond Myklebust nfs_set_pageerror(page); 1044788e7a89STrond Myklebust req->wb_context->error = task->tk_status; 10451da177e4SLinus Torvalds end_page_writeback(page); 10461da177e4SLinus Torvalds nfs_inode_remove_request(req); 1047788e7a89STrond Myklebust dprintk(", error = %d\n", task->tk_status); 10481da177e4SLinus Torvalds goto next; 10491da177e4SLinus Torvalds } 10501da177e4SLinus Torvalds end_page_writeback(page); 10511da177e4SLinus Torvalds 10521da177e4SLinus Torvalds #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) 10531da177e4SLinus Torvalds if (data->args.stable != NFS_UNSTABLE || data->verf.committed == NFS_FILE_SYNC) { 10541da177e4SLinus Torvalds nfs_inode_remove_request(req); 10551da177e4SLinus Torvalds dprintk(" OK\n"); 10561da177e4SLinus Torvalds goto next; 10571da177e4SLinus Torvalds } 10581da177e4SLinus Torvalds memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); 10591da177e4SLinus Torvalds nfs_mark_request_commit(req); 10601da177e4SLinus Torvalds dprintk(" marked for commit\n"); 10611da177e4SLinus Torvalds #else 10621da177e4SLinus Torvalds nfs_inode_remove_request(req); 10631da177e4SLinus Torvalds #endif 10641da177e4SLinus Torvalds next: 1065c6a556b8STrond Myklebust nfs_clear_page_writeback(req); 10661da177e4SLinus Torvalds } 10671da177e4SLinus Torvalds } 10681da177e4SLinus Torvalds 1069788e7a89STrond Myklebust static const struct rpc_call_ops nfs_write_full_ops = { 1070788e7a89STrond Myklebust .rpc_call_done = nfs_writeback_done_full, 1071788e7a89STrond Myklebust .rpc_release = nfs_writedata_release, 1072788e7a89STrond Myklebust }; 1073788e7a89STrond Myklebust 1074788e7a89STrond Myklebust 10751da177e4SLinus Torvalds /* 10761da177e4SLinus Torvalds * This function is called when the WRITE call is complete. 10771da177e4SLinus Torvalds */ 1078462d5b32SChuck Lever int nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data) 10791da177e4SLinus Torvalds { 10801da177e4SLinus Torvalds struct nfs_writeargs *argp = &data->args; 10811da177e4SLinus Torvalds struct nfs_writeres *resp = &data->res; 1082788e7a89STrond Myklebust int status; 10831da177e4SLinus Torvalds 1084a3f565b1SChuck Lever dprintk("NFS: %5u nfs_writeback_done (status %d)\n", 10851da177e4SLinus Torvalds task->tk_pid, task->tk_status); 10861da177e4SLinus Torvalds 1087f551e44fSChuck Lever /* 1088f551e44fSChuck Lever * ->write_done will attempt to use post-op attributes to detect 1089f551e44fSChuck Lever * conflicting writes by other clients. A strict interpretation 1090f551e44fSChuck Lever * of close-to-open would allow us to continue caching even if 1091f551e44fSChuck Lever * another writer had changed the file, but some applications 1092f551e44fSChuck Lever * depend on tighter cache coherency when writing. 1093f551e44fSChuck Lever */ 1094788e7a89STrond Myklebust status = NFS_PROTO(data->inode)->write_done(task, data); 1095788e7a89STrond Myklebust if (status != 0) 1096788e7a89STrond Myklebust return status; 109791d5b470SChuck Lever nfs_add_stats(data->inode, NFSIOS_SERVERWRITTENBYTES, resp->count); 109891d5b470SChuck Lever 10991da177e4SLinus Torvalds #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) 11001da177e4SLinus Torvalds if (resp->verf->committed < argp->stable && task->tk_status >= 0) { 11011da177e4SLinus Torvalds /* We tried a write call, but the server did not 11021da177e4SLinus Torvalds * commit data to stable storage even though we 11031da177e4SLinus Torvalds * requested it. 11041da177e4SLinus Torvalds * Note: There is a known bug in Tru64 < 5.0 in which 11051da177e4SLinus Torvalds * the server reports NFS_DATA_SYNC, but performs 11061da177e4SLinus Torvalds * NFS_FILE_SYNC. We therefore implement this checking 11071da177e4SLinus Torvalds * as a dprintk() in order to avoid filling syslog. 11081da177e4SLinus Torvalds */ 11091da177e4SLinus Torvalds static unsigned long complain; 11101da177e4SLinus Torvalds 11111da177e4SLinus Torvalds if (time_before(complain, jiffies)) { 11121da177e4SLinus Torvalds dprintk("NFS: faulty NFS server %s:" 11131da177e4SLinus Torvalds " (committed = %d) != (stable = %d)\n", 111454ceac45SDavid Howells NFS_SERVER(data->inode)->nfs_client->cl_hostname, 11151da177e4SLinus Torvalds resp->verf->committed, argp->stable); 11161da177e4SLinus Torvalds complain = jiffies + 300 * HZ; 11171da177e4SLinus Torvalds } 11181da177e4SLinus Torvalds } 11191da177e4SLinus Torvalds #endif 11201da177e4SLinus Torvalds /* Is this a short write? */ 11211da177e4SLinus Torvalds if (task->tk_status >= 0 && resp->count < argp->count) { 11221da177e4SLinus Torvalds static unsigned long complain; 11231da177e4SLinus Torvalds 112491d5b470SChuck Lever nfs_inc_stats(data->inode, NFSIOS_SHORTWRITE); 112591d5b470SChuck Lever 11261da177e4SLinus Torvalds /* Has the server at least made some progress? */ 11271da177e4SLinus Torvalds if (resp->count != 0) { 11281da177e4SLinus Torvalds /* Was this an NFSv2 write or an NFSv3 stable write? */ 11291da177e4SLinus Torvalds if (resp->verf->committed != NFS_UNSTABLE) { 11301da177e4SLinus Torvalds /* Resend from where the server left off */ 11311da177e4SLinus Torvalds argp->offset += resp->count; 11321da177e4SLinus Torvalds argp->pgbase += resp->count; 11331da177e4SLinus Torvalds argp->count -= resp->count; 11341da177e4SLinus Torvalds } else { 11351da177e4SLinus Torvalds /* Resend as a stable write in order to avoid 11361da177e4SLinus Torvalds * headaches in the case of a server crash. 11371da177e4SLinus Torvalds */ 11381da177e4SLinus Torvalds argp->stable = NFS_FILE_SYNC; 11391da177e4SLinus Torvalds } 11401da177e4SLinus Torvalds rpc_restart_call(task); 1141788e7a89STrond Myklebust return -EAGAIN; 11421da177e4SLinus Torvalds } 11431da177e4SLinus Torvalds if (time_before(complain, jiffies)) { 11441da177e4SLinus Torvalds printk(KERN_WARNING 11451da177e4SLinus Torvalds "NFS: Server wrote zero bytes, expected %u.\n", 11461da177e4SLinus Torvalds argp->count); 11471da177e4SLinus Torvalds complain = jiffies + 300 * HZ; 11481da177e4SLinus Torvalds } 11491da177e4SLinus Torvalds /* Can't do anything about it except throw an error. */ 11501da177e4SLinus Torvalds task->tk_status = -EIO; 11511da177e4SLinus Torvalds } 1152788e7a89STrond Myklebust return 0; 11531da177e4SLinus Torvalds } 11541da177e4SLinus Torvalds 11551da177e4SLinus Torvalds 11561da177e4SLinus Torvalds #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) 1157963d8fe5STrond Myklebust void nfs_commit_release(void *wdata) 11581da177e4SLinus Torvalds { 11591da177e4SLinus Torvalds nfs_commit_free(wdata); 11601da177e4SLinus Torvalds } 11611da177e4SLinus Torvalds 11621da177e4SLinus Torvalds /* 11631da177e4SLinus Torvalds * Set up the argument/result storage required for the RPC call. 11641da177e4SLinus Torvalds */ 11651da177e4SLinus Torvalds static void nfs_commit_rpcsetup(struct list_head *head, 1166788e7a89STrond Myklebust struct nfs_write_data *data, 1167788e7a89STrond Myklebust int how) 11681da177e4SLinus Torvalds { 11693da28eb1STrond Myklebust struct nfs_page *first; 11701da177e4SLinus Torvalds struct inode *inode; 1171788e7a89STrond Myklebust int flags; 11721da177e4SLinus Torvalds 11731da177e4SLinus Torvalds /* Set up the RPC argument and reply structs 11741da177e4SLinus Torvalds * NB: take care not to mess about with data->commit et al. */ 11751da177e4SLinus Torvalds 11761da177e4SLinus Torvalds list_splice_init(head, &data->pages); 11771da177e4SLinus Torvalds first = nfs_list_entry(data->pages.next); 11781da177e4SLinus Torvalds inode = first->wb_context->dentry->d_inode; 11791da177e4SLinus Torvalds 11801da177e4SLinus Torvalds data->inode = inode; 11811da177e4SLinus Torvalds data->cred = first->wb_context->cred; 11821da177e4SLinus Torvalds 11831da177e4SLinus Torvalds data->args.fh = NFS_FH(data->inode); 11843da28eb1STrond Myklebust /* Note: we always request a commit of the entire inode */ 11853da28eb1STrond Myklebust data->args.offset = 0; 11863da28eb1STrond Myklebust data->args.count = 0; 11873da28eb1STrond Myklebust data->res.count = 0; 11881da177e4SLinus Torvalds data->res.fattr = &data->fattr; 11891da177e4SLinus Torvalds data->res.verf = &data->verf; 11900e574af1STrond Myklebust nfs_fattr_init(&data->fattr); 11911da177e4SLinus Torvalds 1192788e7a89STrond Myklebust /* Set up the initial task struct. */ 1193788e7a89STrond Myklebust flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; 1194788e7a89STrond Myklebust rpc_init_task(&data->task, NFS_CLIENT(inode), flags, &nfs_commit_ops, data); 11951da177e4SLinus Torvalds NFS_PROTO(inode)->commit_setup(data, how); 11961da177e4SLinus Torvalds 11971da177e4SLinus Torvalds data->task.tk_priority = flush_task_priority(how); 11981da177e4SLinus Torvalds data->task.tk_cookie = (unsigned long)inode; 11991da177e4SLinus Torvalds 1200a3f565b1SChuck Lever dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid); 12011da177e4SLinus Torvalds } 12021da177e4SLinus Torvalds 12031da177e4SLinus Torvalds /* 12041da177e4SLinus Torvalds * Commit dirty pages 12051da177e4SLinus Torvalds */ 12061da177e4SLinus Torvalds static int 120740859d7eSChuck Lever nfs_commit_list(struct inode *inode, struct list_head *head, int how) 12081da177e4SLinus Torvalds { 12091da177e4SLinus Torvalds struct nfs_write_data *data; 12101da177e4SLinus Torvalds struct nfs_page *req; 12111da177e4SLinus Torvalds 1212e9f7bee1STrond Myklebust data = nfs_commit_alloc(); 12131da177e4SLinus Torvalds 12141da177e4SLinus Torvalds if (!data) 12151da177e4SLinus Torvalds goto out_bad; 12161da177e4SLinus Torvalds 12171da177e4SLinus Torvalds /* Set up the argument struct */ 12181da177e4SLinus Torvalds nfs_commit_rpcsetup(head, data, how); 12191da177e4SLinus Torvalds 12201da177e4SLinus Torvalds nfs_execute_write(data); 12211da177e4SLinus Torvalds return 0; 12221da177e4SLinus Torvalds out_bad: 12231da177e4SLinus Torvalds while (!list_empty(head)) { 12241da177e4SLinus Torvalds req = nfs_list_entry(head->next); 12251da177e4SLinus Torvalds nfs_list_remove_request(req); 12261da177e4SLinus Torvalds nfs_mark_request_commit(req); 122783715ad5STrond Myklebust dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); 12285c2d97cbSTrond Myklebust nfs_clear_page_writeback(req); 12291da177e4SLinus Torvalds } 12301da177e4SLinus Torvalds return -ENOMEM; 12311da177e4SLinus Torvalds } 12321da177e4SLinus Torvalds 12331da177e4SLinus Torvalds /* 12341da177e4SLinus Torvalds * COMMIT call returned 12351da177e4SLinus Torvalds */ 1236788e7a89STrond Myklebust static void nfs_commit_done(struct rpc_task *task, void *calldata) 12371da177e4SLinus Torvalds { 1238963d8fe5STrond Myklebust struct nfs_write_data *data = calldata; 12391da177e4SLinus Torvalds struct nfs_page *req; 12401da177e4SLinus Torvalds 1241a3f565b1SChuck Lever dprintk("NFS: %5u nfs_commit_done (status %d)\n", 12421da177e4SLinus Torvalds task->tk_pid, task->tk_status); 12431da177e4SLinus Torvalds 1244788e7a89STrond Myklebust /* Call the NFS version-specific code */ 1245788e7a89STrond Myklebust if (NFS_PROTO(data->inode)->commit_done(task, data) != 0) 1246788e7a89STrond Myklebust return; 1247788e7a89STrond Myklebust 12481da177e4SLinus Torvalds while (!list_empty(&data->pages)) { 12491da177e4SLinus Torvalds req = nfs_list_entry(data->pages.next); 12501da177e4SLinus Torvalds nfs_list_remove_request(req); 1251fd39fc85SChristoph Lameter dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); 12521da177e4SLinus Torvalds 12531da177e4SLinus Torvalds dprintk("NFS: commit (%s/%Ld %d@%Ld)", 12541da177e4SLinus Torvalds req->wb_context->dentry->d_inode->i_sb->s_id, 12551da177e4SLinus Torvalds (long long)NFS_FILEID(req->wb_context->dentry->d_inode), 12561da177e4SLinus Torvalds req->wb_bytes, 12571da177e4SLinus Torvalds (long long)req_offset(req)); 12581da177e4SLinus Torvalds if (task->tk_status < 0) { 12591da177e4SLinus Torvalds req->wb_context->error = task->tk_status; 12601da177e4SLinus Torvalds nfs_inode_remove_request(req); 12611da177e4SLinus Torvalds dprintk(", error = %d\n", task->tk_status); 12621da177e4SLinus Torvalds goto next; 12631da177e4SLinus Torvalds } 12641da177e4SLinus Torvalds 12651da177e4SLinus Torvalds /* Okay, COMMIT succeeded, apparently. Check the verifier 12661da177e4SLinus Torvalds * returned by the server against all stored verfs. */ 12671da177e4SLinus Torvalds if (!memcmp(req->wb_verf.verifier, data->verf.verifier, sizeof(data->verf.verifier))) { 12681da177e4SLinus Torvalds /* We have a match */ 12691da177e4SLinus Torvalds nfs_inode_remove_request(req); 12701da177e4SLinus Torvalds dprintk(" OK\n"); 12711da177e4SLinus Torvalds goto next; 12721da177e4SLinus Torvalds } 12731da177e4SLinus Torvalds /* We have a mismatch. Write the page again */ 12741da177e4SLinus Torvalds dprintk(" mismatch\n"); 127561822ab5STrond Myklebust nfs_redirty_request(req); 12761da177e4SLinus Torvalds next: 1277c6a556b8STrond Myklebust nfs_clear_page_writeback(req); 12781da177e4SLinus Torvalds } 12791da177e4SLinus Torvalds } 1280788e7a89STrond Myklebust 1281788e7a89STrond Myklebust static const struct rpc_call_ops nfs_commit_ops = { 1282788e7a89STrond Myklebust .rpc_call_done = nfs_commit_done, 1283788e7a89STrond Myklebust .rpc_release = nfs_commit_release, 1284788e7a89STrond Myklebust }; 1285c42de9ddSTrond Myklebust #else 1286c42de9ddSTrond Myklebust static inline int nfs_commit_list(struct inode *inode, struct list_head *head, int how) 1287c42de9ddSTrond Myklebust { 1288c42de9ddSTrond Myklebust return 0; 1289c42de9ddSTrond Myklebust } 12901da177e4SLinus Torvalds #endif 12911da177e4SLinus Torvalds 12923f442547STrond Myklebust static long nfs_flush_mapping(struct address_space *mapping, struct writeback_control *wbc, int how) 12931da177e4SLinus Torvalds { 129428c6925fSTrond Myklebust struct nfs_inode *nfsi = NFS_I(mapping->host); 12951da177e4SLinus Torvalds LIST_HEAD(head); 12963f442547STrond Myklebust long res; 12971da177e4SLinus Torvalds 12981da177e4SLinus Torvalds spin_lock(&nfsi->req_lock); 12993f442547STrond Myklebust res = nfs_scan_dirty(mapping, wbc, &head); 13001da177e4SLinus Torvalds spin_unlock(&nfsi->req_lock); 1301ab0a3dbeSTrond Myklebust if (res) { 130228c6925fSTrond Myklebust int error = nfs_flush_list(mapping->host, &head, res, how); 13031da177e4SLinus Torvalds if (error < 0) 13041da177e4SLinus Torvalds return error; 13057d46a49fSTrond Myklebust } 13061da177e4SLinus Torvalds return res; 13071da177e4SLinus Torvalds } 13081da177e4SLinus Torvalds 13091da177e4SLinus Torvalds #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) 13103da28eb1STrond Myklebust int nfs_commit_inode(struct inode *inode, int how) 13111da177e4SLinus Torvalds { 13121da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 13131da177e4SLinus Torvalds LIST_HEAD(head); 13147d46a49fSTrond Myklebust int res; 13151da177e4SLinus Torvalds 13161da177e4SLinus Torvalds spin_lock(&nfsi->req_lock); 13173da28eb1STrond Myklebust res = nfs_scan_commit(inode, &head, 0, 0); 13183da28eb1STrond Myklebust spin_unlock(&nfsi->req_lock); 13191da177e4SLinus Torvalds if (res) { 13207d46a49fSTrond Myklebust int error = nfs_commit_list(inode, &head, how); 13211da177e4SLinus Torvalds if (error < 0) 13221da177e4SLinus Torvalds return error; 13233da28eb1STrond Myklebust } 13241da177e4SLinus Torvalds return res; 13251da177e4SLinus Torvalds } 13261da177e4SLinus Torvalds #endif 13271da177e4SLinus Torvalds 13281c75950bSTrond Myklebust long nfs_sync_mapping_wait(struct address_space *mapping, struct writeback_control *wbc, int how) 13291da177e4SLinus Torvalds { 13301c75950bSTrond Myklebust struct inode *inode = mapping->host; 1331c42de9ddSTrond Myklebust struct nfs_inode *nfsi = NFS_I(inode); 13321c75950bSTrond Myklebust unsigned long idx_start, idx_end; 13331c75950bSTrond Myklebust unsigned int npages = 0; 1334c42de9ddSTrond Myklebust LIST_HEAD(head); 133570b9ecbdSTrond Myklebust int nocommit = how & FLUSH_NOCOMMIT; 13363f442547STrond Myklebust long pages, ret; 13371da177e4SLinus Torvalds 13381c75950bSTrond Myklebust /* FIXME */ 13391c75950bSTrond Myklebust if (wbc->range_cyclic) 13401c75950bSTrond Myklebust idx_start = 0; 13411c75950bSTrond Myklebust else { 13421c75950bSTrond Myklebust idx_start = wbc->range_start >> PAGE_CACHE_SHIFT; 13431c75950bSTrond Myklebust idx_end = wbc->range_end >> PAGE_CACHE_SHIFT; 13441c75950bSTrond Myklebust if (idx_end > idx_start) { 13451c75950bSTrond Myklebust unsigned long l_npages = 1 + idx_end - idx_start; 13461c75950bSTrond Myklebust npages = l_npages; 13471c75950bSTrond Myklebust if (sizeof(npages) != sizeof(l_npages) && 13481c75950bSTrond Myklebust (unsigned long)npages != l_npages) 13491c75950bSTrond Myklebust npages = 0; 13501c75950bSTrond Myklebust } 13511c75950bSTrond Myklebust } 1352c42de9ddSTrond Myklebust how &= ~FLUSH_NOCOMMIT; 1353c42de9ddSTrond Myklebust spin_lock(&nfsi->req_lock); 13541da177e4SLinus Torvalds do { 13551c75950bSTrond Myklebust wbc->pages_skipped = 0; 1356c42de9ddSTrond Myklebust ret = nfs_wait_on_requests_locked(inode, idx_start, npages); 1357c42de9ddSTrond Myklebust if (ret != 0) 1358c42de9ddSTrond Myklebust continue; 13591c75950bSTrond Myklebust pages = nfs_scan_dirty(mapping, wbc, &head); 1360c42de9ddSTrond Myklebust if (pages != 0) { 1361c42de9ddSTrond Myklebust spin_unlock(&nfsi->req_lock); 1362e8e058e8STrond Myklebust if (how & FLUSH_INVALIDATE) { 136383715ad5STrond Myklebust nfs_cancel_dirty_list(&head); 1364e8e058e8STrond Myklebust ret = pages; 1365e8e058e8STrond Myklebust } else 1366c42de9ddSTrond Myklebust ret = nfs_flush_list(inode, &head, pages, how); 1367c42de9ddSTrond Myklebust spin_lock(&nfsi->req_lock); 136870b9ecbdSTrond Myklebust continue; 136970b9ecbdSTrond Myklebust } 13701c75950bSTrond Myklebust if (wbc->pages_skipped != 0) 13711c75950bSTrond Myklebust continue; 1372c42de9ddSTrond Myklebust if (nocommit) 1373c42de9ddSTrond Myklebust break; 1374d2ccddf0STrond Myklebust pages = nfs_scan_commit(inode, &head, idx_start, npages); 13751c75950bSTrond Myklebust if (pages == 0) { 13761c75950bSTrond Myklebust if (wbc->pages_skipped != 0) 13771c75950bSTrond Myklebust continue; 1378c42de9ddSTrond Myklebust break; 13791c75950bSTrond Myklebust } 1380d2ccddf0STrond Myklebust if (how & FLUSH_INVALIDATE) { 1381d2ccddf0STrond Myklebust spin_unlock(&nfsi->req_lock); 138283715ad5STrond Myklebust nfs_cancel_commit_list(&head); 1383e8e058e8STrond Myklebust ret = pages; 1384d2ccddf0STrond Myklebust spin_lock(&nfsi->req_lock); 1385d2ccddf0STrond Myklebust continue; 1386d2ccddf0STrond Myklebust } 1387d2ccddf0STrond Myklebust pages += nfs_scan_commit(inode, &head, 0, 0); 1388c42de9ddSTrond Myklebust spin_unlock(&nfsi->req_lock); 1389c42de9ddSTrond Myklebust ret = nfs_commit_list(inode, &head, how); 1390c42de9ddSTrond Myklebust spin_lock(&nfsi->req_lock); 1391c42de9ddSTrond Myklebust } while (ret >= 0); 1392c42de9ddSTrond Myklebust spin_unlock(&nfsi->req_lock); 1393c42de9ddSTrond Myklebust return ret; 13941da177e4SLinus Torvalds } 13951da177e4SLinus Torvalds 13961c75950bSTrond Myklebust /* 13971c75950bSTrond Myklebust * flush the inode to disk. 13981c75950bSTrond Myklebust */ 13991c75950bSTrond Myklebust int nfs_wb_all(struct inode *inode) 14001c75950bSTrond Myklebust { 14011c75950bSTrond Myklebust struct address_space *mapping = inode->i_mapping; 14021c75950bSTrond Myklebust struct writeback_control wbc = { 14031c75950bSTrond Myklebust .bdi = mapping->backing_dev_info, 14041c75950bSTrond Myklebust .sync_mode = WB_SYNC_ALL, 14051c75950bSTrond Myklebust .nr_to_write = LONG_MAX, 140661822ab5STrond Myklebust .for_writepages = 1, 14071c75950bSTrond Myklebust .range_cyclic = 1, 14081c75950bSTrond Myklebust }; 14091c75950bSTrond Myklebust int ret; 14101c75950bSTrond Myklebust 141161822ab5STrond Myklebust ret = generic_writepages(mapping, &wbc); 141261822ab5STrond Myklebust if (ret < 0) 141361822ab5STrond Myklebust goto out; 14141c75950bSTrond Myklebust ret = nfs_sync_mapping_wait(mapping, &wbc, 0); 14151c75950bSTrond Myklebust if (ret >= 0) 14161c75950bSTrond Myklebust return 0; 141761822ab5STrond Myklebust out: 1418e507d9ebSTrond Myklebust __mark_inode_dirty(mapping->host, I_DIRTY_PAGES); 14191c75950bSTrond Myklebust return ret; 14201c75950bSTrond Myklebust } 14211c75950bSTrond Myklebust 14221c75950bSTrond Myklebust int nfs_sync_mapping_range(struct address_space *mapping, loff_t range_start, loff_t range_end, int how) 14231c75950bSTrond Myklebust { 14241c75950bSTrond Myklebust struct writeback_control wbc = { 14251c75950bSTrond Myklebust .bdi = mapping->backing_dev_info, 14261c75950bSTrond Myklebust .sync_mode = WB_SYNC_ALL, 14271c75950bSTrond Myklebust .nr_to_write = LONG_MAX, 14281c75950bSTrond Myklebust .range_start = range_start, 14291c75950bSTrond Myklebust .range_end = range_end, 143061822ab5STrond Myklebust .for_writepages = 1, 14311c75950bSTrond Myklebust }; 14321c75950bSTrond Myklebust int ret; 14331c75950bSTrond Myklebust 143461822ab5STrond Myklebust if (!(how & FLUSH_NOWRITEPAGE)) { 143561822ab5STrond Myklebust ret = generic_writepages(mapping, &wbc); 143661822ab5STrond Myklebust if (ret < 0) 143761822ab5STrond Myklebust goto out; 143861822ab5STrond Myklebust } 14391c75950bSTrond Myklebust ret = nfs_sync_mapping_wait(mapping, &wbc, how); 14401c75950bSTrond Myklebust if (ret >= 0) 14411c75950bSTrond Myklebust return 0; 144261822ab5STrond Myklebust out: 1443e507d9ebSTrond Myklebust __mark_inode_dirty(mapping->host, I_DIRTY_PAGES); 14441c75950bSTrond Myklebust return ret; 14451c75950bSTrond Myklebust } 14461c75950bSTrond Myklebust 144761822ab5STrond Myklebust int nfs_wb_page_priority(struct inode *inode, struct page *page, int how) 14481c75950bSTrond Myklebust { 14491c75950bSTrond Myklebust loff_t range_start = page_offset(page); 14501c75950bSTrond Myklebust loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); 14514d770ccfSTrond Myklebust struct writeback_control wbc = { 14524d770ccfSTrond Myklebust .bdi = page->mapping->backing_dev_info, 14534d770ccfSTrond Myklebust .sync_mode = WB_SYNC_ALL, 14544d770ccfSTrond Myklebust .nr_to_write = LONG_MAX, 14554d770ccfSTrond Myklebust .range_start = range_start, 14564d770ccfSTrond Myklebust .range_end = range_end, 14574d770ccfSTrond Myklebust }; 14584d770ccfSTrond Myklebust int ret; 14591c75950bSTrond Myklebust 14604d770ccfSTrond Myklebust BUG_ON(!PageLocked(page)); 14614d770ccfSTrond Myklebust if (!(how & FLUSH_NOWRITEPAGE) && clear_page_dirty_for_io(page)) { 14624d770ccfSTrond Myklebust ret = nfs_writepage_locked(page, &wbc); 14634d770ccfSTrond Myklebust if (ret < 0) 14644d770ccfSTrond Myklebust goto out; 14654d770ccfSTrond Myklebust } 1466f40313acSTrond Myklebust if (!PagePrivate(page)) 1467f40313acSTrond Myklebust return 0; 14684d770ccfSTrond Myklebust ret = nfs_sync_mapping_wait(page->mapping, &wbc, how); 14694d770ccfSTrond Myklebust if (ret >= 0) 14704d770ccfSTrond Myklebust return 0; 14714d770ccfSTrond Myklebust out: 1472e507d9ebSTrond Myklebust __mark_inode_dirty(inode, I_DIRTY_PAGES); 14734d770ccfSTrond Myklebust return ret; 14741c75950bSTrond Myklebust } 14751c75950bSTrond Myklebust 14761c75950bSTrond Myklebust /* 14771c75950bSTrond Myklebust * Write back all requests on one page - we do this before reading it. 14781c75950bSTrond Myklebust */ 14791c75950bSTrond Myklebust int nfs_wb_page(struct inode *inode, struct page* page) 14801c75950bSTrond Myklebust { 14814d770ccfSTrond Myklebust return nfs_wb_page_priority(inode, page, FLUSH_STABLE); 14821c75950bSTrond Myklebust } 14831c75950bSTrond Myklebust 14841a54533eSTrond Myklebust int nfs_set_page_dirty(struct page *page) 14851a54533eSTrond Myklebust { 14861a54533eSTrond Myklebust struct nfs_page *req; 14871a54533eSTrond Myklebust 14881a54533eSTrond Myklebust req = nfs_page_find_request(page); 14891a54533eSTrond Myklebust if (req != NULL) { 14901a54533eSTrond Myklebust /* Mark any existing write requests for flushing */ 14911a54533eSTrond Myklebust set_bit(PG_NEED_FLUSH, &req->wb_flags); 14921a54533eSTrond Myklebust nfs_release_request(req); 14931a54533eSTrond Myklebust } 14941a54533eSTrond Myklebust return __set_page_dirty_nobuffers(page); 14951a54533eSTrond Myklebust } 14961a54533eSTrond Myklebust 14971c75950bSTrond Myklebust 1498f7b422b1SDavid Howells int __init nfs_init_writepagecache(void) 14991da177e4SLinus Torvalds { 15001da177e4SLinus Torvalds nfs_wdata_cachep = kmem_cache_create("nfs_write_data", 15011da177e4SLinus Torvalds sizeof(struct nfs_write_data), 15021da177e4SLinus Torvalds 0, SLAB_HWCACHE_ALIGN, 15031da177e4SLinus Torvalds NULL, NULL); 15041da177e4SLinus Torvalds if (nfs_wdata_cachep == NULL) 15051da177e4SLinus Torvalds return -ENOMEM; 15061da177e4SLinus Torvalds 150793d2341cSMatthew Dobson nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE, 15081da177e4SLinus Torvalds nfs_wdata_cachep); 15091da177e4SLinus Torvalds if (nfs_wdata_mempool == NULL) 15101da177e4SLinus Torvalds return -ENOMEM; 15111da177e4SLinus Torvalds 151293d2341cSMatthew Dobson nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT, 15131da177e4SLinus Torvalds nfs_wdata_cachep); 15141da177e4SLinus Torvalds if (nfs_commit_mempool == NULL) 15151da177e4SLinus Torvalds return -ENOMEM; 15161da177e4SLinus Torvalds 15171da177e4SLinus Torvalds return 0; 15181da177e4SLinus Torvalds } 15191da177e4SLinus Torvalds 1520266bee88SDavid Brownell void nfs_destroy_writepagecache(void) 15211da177e4SLinus Torvalds { 15221da177e4SLinus Torvalds mempool_destroy(nfs_commit_mempool); 15231da177e4SLinus Torvalds mempool_destroy(nfs_wdata_mempool); 15241a1d92c1SAlexey Dobriyan kmem_cache_destroy(nfs_wdata_cachep); 15251da177e4SLinus Torvalds } 15261da177e4SLinus Torvalds 1527