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); 80e261f51fSTrond Myklebust static void nfs_mark_request_dirty(struct nfs_page *req); 811da177e4SLinus Torvalds static int nfs_wait_on_write_congestion(struct address_space *, int); 821da177e4SLinus Torvalds static int nfs_wait_on_requests(struct inode *, unsigned long, unsigned int); 833f442547STrond Myklebust static long nfs_flush_mapping(struct address_space *mapping, struct writeback_control *wbc, 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 /* 248e261f51fSTrond Myklebust * Find an associated nfs write request, and prepare to flush it out 249e261f51fSTrond Myklebust * Returns 1 if there was no write request, or if the request was 250e261f51fSTrond Myklebust * already tagged by nfs_set_page_dirty.Returns 0 if the request 251e261f51fSTrond Myklebust * was not tagged. 252e261f51fSTrond Myklebust * May also return an error if the user signalled nfs_wait_on_request(). 253e261f51fSTrond Myklebust */ 254e261f51fSTrond Myklebust static int nfs_page_mark_flush(struct page *page) 255e261f51fSTrond Myklebust { 256e261f51fSTrond Myklebust struct nfs_page *req; 257e261f51fSTrond Myklebust spinlock_t *req_lock = &NFS_I(page->mapping->host)->req_lock; 258e261f51fSTrond Myklebust int ret; 259e261f51fSTrond Myklebust 260e261f51fSTrond Myklebust spin_lock(req_lock); 261e261f51fSTrond Myklebust for(;;) { 262e261f51fSTrond Myklebust req = nfs_page_find_request_locked(page); 263e261f51fSTrond Myklebust if (req == NULL) { 264e261f51fSTrond Myklebust spin_unlock(req_lock); 265e261f51fSTrond Myklebust return 1; 266e261f51fSTrond Myklebust } 267e261f51fSTrond Myklebust if (nfs_lock_request_dontget(req)) 268e261f51fSTrond Myklebust break; 269e261f51fSTrond Myklebust /* Note: If we hold the page lock, as is the case in nfs_writepage, 270e261f51fSTrond Myklebust * then the call to nfs_lock_request_dontget() will always 271e261f51fSTrond Myklebust * succeed provided that someone hasn't already marked the 272e261f51fSTrond Myklebust * request as dirty (in which case we don't care). 273e261f51fSTrond Myklebust */ 274e261f51fSTrond Myklebust spin_unlock(req_lock); 275e261f51fSTrond Myklebust ret = nfs_wait_on_request(req); 276e261f51fSTrond Myklebust nfs_release_request(req); 277e261f51fSTrond Myklebust if (ret != 0) 278e261f51fSTrond Myklebust return ret; 279e261f51fSTrond Myklebust spin_lock(req_lock); 280e261f51fSTrond Myklebust } 281e261f51fSTrond Myklebust spin_unlock(req_lock); 28261822ab5STrond Myklebust if (test_and_set_bit(PG_FLUSHING, &req->wb_flags) == 0) { 283e261f51fSTrond Myklebust nfs_mark_request_dirty(req); 28461822ab5STrond Myklebust set_page_writeback(page); 28561822ab5STrond Myklebust } 286e261f51fSTrond Myklebust ret = test_bit(PG_NEED_FLUSH, &req->wb_flags); 287e261f51fSTrond Myklebust nfs_unlock_request(req); 288e261f51fSTrond Myklebust return ret; 289e261f51fSTrond Myklebust } 290e261f51fSTrond Myklebust 291e261f51fSTrond Myklebust /* 2921da177e4SLinus Torvalds * Write an mmapped page to the server. 2931da177e4SLinus Torvalds */ 2944d770ccfSTrond Myklebust static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc) 2951da177e4SLinus Torvalds { 2961da177e4SLinus Torvalds struct nfs_open_context *ctx; 2971da177e4SLinus Torvalds struct inode *inode = page->mapping->host; 29849a70f27STrond Myklebust unsigned offset; 299e261f51fSTrond Myklebust int err; 3001da177e4SLinus Torvalds 30191d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE); 30291d5b470SChuck Lever nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1); 30391d5b470SChuck Lever 304e261f51fSTrond Myklebust err = nfs_page_mark_flush(page); 305e261f51fSTrond Myklebust if (err <= 0) 3061a54533eSTrond Myklebust goto out; 307e261f51fSTrond Myklebust err = 0; 30849a70f27STrond Myklebust offset = nfs_page_length(page); 30949a70f27STrond Myklebust if (!offset) 3101da177e4SLinus Torvalds goto out; 31149a70f27STrond Myklebust 312d530838bSTrond Myklebust ctx = nfs_find_open_context(inode, NULL, FMODE_WRITE); 3131da177e4SLinus Torvalds if (ctx == NULL) { 3141da177e4SLinus Torvalds err = -EBADF; 3151da177e4SLinus Torvalds goto out; 3161da177e4SLinus Torvalds } 317e21195a7STrond Myklebust err = nfs_writepage_setup(ctx, page, 0, offset); 318200baa21STrond Myklebust put_nfs_open_context(ctx); 319e261f51fSTrond Myklebust if (err != 0) 320e261f51fSTrond Myklebust goto out; 321e261f51fSTrond Myklebust err = nfs_page_mark_flush(page); 322e261f51fSTrond Myklebust if (err > 0) 323e261f51fSTrond Myklebust err = 0; 324200baa21STrond Myklebust out: 325abd3e641STrond Myklebust if (!wbc->for_writepages) 32628c6925fSTrond Myklebust nfs_flush_mapping(page->mapping, wbc, wb_priority(wbc)); 3274d770ccfSTrond Myklebust return err; 3284d770ccfSTrond Myklebust } 3294d770ccfSTrond Myklebust 3304d770ccfSTrond Myklebust int nfs_writepage(struct page *page, struct writeback_control *wbc) 3314d770ccfSTrond Myklebust { 3324d770ccfSTrond Myklebust int err; 3334d770ccfSTrond Myklebust 3344d770ccfSTrond Myklebust err = nfs_writepage_locked(page, wbc); 3351da177e4SLinus Torvalds unlock_page(page); 3361da177e4SLinus Torvalds return err; 3371da177e4SLinus Torvalds } 3381da177e4SLinus Torvalds 3391da177e4SLinus Torvalds /* 3401da177e4SLinus Torvalds * Note: causes nfs_update_request() to block on the assumption 3411da177e4SLinus Torvalds * that the writeback is generated due to memory pressure. 3421da177e4SLinus Torvalds */ 3431da177e4SLinus Torvalds int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc) 3441da177e4SLinus Torvalds { 3451da177e4SLinus Torvalds struct backing_dev_info *bdi = mapping->backing_dev_info; 3461da177e4SLinus Torvalds struct inode *inode = mapping->host; 3471da177e4SLinus Torvalds int err; 3481da177e4SLinus Torvalds 34991d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES); 35091d5b470SChuck Lever 3511da177e4SLinus Torvalds err = generic_writepages(mapping, wbc); 3521da177e4SLinus Torvalds if (err) 3531da177e4SLinus Torvalds return err; 3541da177e4SLinus Torvalds while (test_and_set_bit(BDI_write_congested, &bdi->state) != 0) { 3551da177e4SLinus Torvalds if (wbc->nonblocking) 3561da177e4SLinus Torvalds return 0; 3571da177e4SLinus Torvalds nfs_wait_on_write_congestion(mapping, 0); 3581da177e4SLinus Torvalds } 35928c6925fSTrond Myklebust err = nfs_flush_mapping(mapping, wbc, wb_priority(wbc)); 3601da177e4SLinus Torvalds if (err < 0) 3611da177e4SLinus Torvalds goto out; 36291d5b470SChuck Lever nfs_add_stats(inode, NFSIOS_WRITEPAGES, err); 3631da177e4SLinus Torvalds if (!wbc->nonblocking && wbc->sync_mode == WB_SYNC_ALL) { 3641da177e4SLinus Torvalds err = nfs_wait_on_requests(inode, 0, 0); 3651da177e4SLinus Torvalds if (err < 0) 3661da177e4SLinus Torvalds goto out; 3671da177e4SLinus Torvalds } 3683da28eb1STrond Myklebust err = nfs_commit_inode(inode, wb_priority(wbc)); 3693f442547STrond Myklebust if (err > 0) 3701da177e4SLinus Torvalds err = 0; 3711da177e4SLinus Torvalds out: 3721da177e4SLinus Torvalds clear_bit(BDI_write_congested, &bdi->state); 3731da177e4SLinus Torvalds wake_up_all(&nfs_write_congestion); 3743fcfab16SAndrew Morton congestion_end(WRITE); 3751da177e4SLinus Torvalds return err; 3761da177e4SLinus Torvalds } 3771da177e4SLinus Torvalds 3781da177e4SLinus Torvalds /* 3791da177e4SLinus Torvalds * Insert a write request into an inode 3801da177e4SLinus Torvalds */ 3811da177e4SLinus Torvalds static int nfs_inode_add_request(struct inode *inode, struct nfs_page *req) 3821da177e4SLinus Torvalds { 3831da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 3841da177e4SLinus Torvalds int error; 3851da177e4SLinus Torvalds 3861da177e4SLinus Torvalds error = radix_tree_insert(&nfsi->nfs_page_tree, req->wb_index, req); 3871da177e4SLinus Torvalds BUG_ON(error == -EEXIST); 3881da177e4SLinus Torvalds if (error) 3891da177e4SLinus Torvalds return error; 3901da177e4SLinus Torvalds if (!nfsi->npages) { 3911da177e4SLinus Torvalds igrab(inode); 3921da177e4SLinus Torvalds nfs_begin_data_update(inode); 3931da177e4SLinus Torvalds if (nfs_have_delegation(inode, FMODE_WRITE)) 3941da177e4SLinus Torvalds nfsi->change_attr++; 3951da177e4SLinus Torvalds } 396deb7d638STrond Myklebust SetPagePrivate(req->wb_page); 397277459d2STrond Myklebust set_page_private(req->wb_page, (unsigned long)req); 3981da177e4SLinus Torvalds nfsi->npages++; 3991da177e4SLinus Torvalds atomic_inc(&req->wb_count); 4001da177e4SLinus Torvalds return 0; 4011da177e4SLinus Torvalds } 4021da177e4SLinus Torvalds 4031da177e4SLinus Torvalds /* 4041da177e4SLinus Torvalds * Insert a write request into an inode 4051da177e4SLinus Torvalds */ 4061da177e4SLinus Torvalds static void nfs_inode_remove_request(struct nfs_page *req) 4071da177e4SLinus Torvalds { 4081da177e4SLinus Torvalds struct inode *inode = req->wb_context->dentry->d_inode; 4091da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 4101da177e4SLinus Torvalds 4111da177e4SLinus Torvalds BUG_ON (!NFS_WBACK_BUSY(req)); 4121da177e4SLinus Torvalds 4131da177e4SLinus Torvalds spin_lock(&nfsi->req_lock); 414277459d2STrond Myklebust set_page_private(req->wb_page, 0); 415deb7d638STrond Myklebust ClearPagePrivate(req->wb_page); 4161da177e4SLinus Torvalds radix_tree_delete(&nfsi->nfs_page_tree, req->wb_index); 4171da177e4SLinus Torvalds nfsi->npages--; 4181da177e4SLinus Torvalds if (!nfsi->npages) { 4191da177e4SLinus Torvalds spin_unlock(&nfsi->req_lock); 420951a143bSTrond Myklebust nfs_end_data_update(inode); 4211da177e4SLinus Torvalds iput(inode); 4221da177e4SLinus Torvalds } else 4231da177e4SLinus Torvalds spin_unlock(&nfsi->req_lock); 4241da177e4SLinus Torvalds nfs_clear_request(req); 4251da177e4SLinus Torvalds nfs_release_request(req); 4261da177e4SLinus Torvalds } 4271da177e4SLinus Torvalds 4281da177e4SLinus Torvalds /* 4291da177e4SLinus Torvalds * Add a request to the inode's dirty list. 4301da177e4SLinus Torvalds */ 4311da177e4SLinus Torvalds static void 4321da177e4SLinus Torvalds nfs_mark_request_dirty(struct nfs_page *req) 4331da177e4SLinus Torvalds { 4341da177e4SLinus Torvalds struct inode *inode = req->wb_context->dentry->d_inode; 4351da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 4361da177e4SLinus Torvalds 4371da177e4SLinus Torvalds spin_lock(&nfsi->req_lock); 4383da28eb1STrond Myklebust radix_tree_tag_set(&nfsi->nfs_page_tree, 4393da28eb1STrond Myklebust req->wb_index, NFS_PAGE_TAG_DIRTY); 4401da177e4SLinus Torvalds nfs_list_add_request(req, &nfsi->dirty); 4411da177e4SLinus Torvalds nfsi->ndirty++; 4421da177e4SLinus Torvalds spin_unlock(&nfsi->req_lock); 443b1e7a8fdSChristoph Lameter inc_zone_page_state(req->wb_page, NR_FILE_DIRTY); 4441da177e4SLinus Torvalds mark_inode_dirty(inode); 4451da177e4SLinus Torvalds } 4461da177e4SLinus Torvalds 44761822ab5STrond Myklebust static void 44861822ab5STrond Myklebust nfs_redirty_request(struct nfs_page *req) 44961822ab5STrond Myklebust { 45061822ab5STrond Myklebust clear_bit(PG_FLUSHING, &req->wb_flags); 45161822ab5STrond Myklebust __set_page_dirty_nobuffers(req->wb_page); 45261822ab5STrond Myklebust } 45361822ab5STrond Myklebust 4541da177e4SLinus Torvalds /* 4551da177e4SLinus Torvalds * Check if a request is dirty 4561da177e4SLinus Torvalds */ 4571da177e4SLinus Torvalds static inline int 4581da177e4SLinus Torvalds nfs_dirty_request(struct nfs_page *req) 4591da177e4SLinus Torvalds { 460e261f51fSTrond Myklebust return test_bit(PG_FLUSHING, &req->wb_flags) == 0; 4611da177e4SLinus Torvalds } 4621da177e4SLinus Torvalds 4631da177e4SLinus Torvalds #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) 4641da177e4SLinus Torvalds /* 4651da177e4SLinus Torvalds * Add a request to the inode's commit list. 4661da177e4SLinus Torvalds */ 4671da177e4SLinus Torvalds static void 4681da177e4SLinus Torvalds nfs_mark_request_commit(struct nfs_page *req) 4691da177e4SLinus Torvalds { 4701da177e4SLinus Torvalds struct inode *inode = req->wb_context->dentry->d_inode; 4711da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 4721da177e4SLinus Torvalds 4731da177e4SLinus Torvalds spin_lock(&nfsi->req_lock); 4741da177e4SLinus Torvalds nfs_list_add_request(req, &nfsi->commit); 4751da177e4SLinus Torvalds nfsi->ncommit++; 4761da177e4SLinus Torvalds spin_unlock(&nfsi->req_lock); 477fd39fc85SChristoph Lameter inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); 4781da177e4SLinus Torvalds mark_inode_dirty(inode); 4791da177e4SLinus Torvalds } 4801da177e4SLinus Torvalds #endif 4811da177e4SLinus Torvalds 4821da177e4SLinus Torvalds /* 4831da177e4SLinus Torvalds * Wait for a request to complete. 4841da177e4SLinus Torvalds * 4851da177e4SLinus Torvalds * Interruptible by signals only if mounted with intr flag. 4861da177e4SLinus Torvalds */ 487c42de9ddSTrond Myklebust static int nfs_wait_on_requests_locked(struct inode *inode, unsigned long idx_start, unsigned int npages) 4881da177e4SLinus Torvalds { 4891da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 4901da177e4SLinus Torvalds struct nfs_page *req; 4911da177e4SLinus Torvalds unsigned long idx_end, next; 4921da177e4SLinus Torvalds unsigned int res = 0; 4931da177e4SLinus Torvalds int error; 4941da177e4SLinus Torvalds 4951da177e4SLinus Torvalds if (npages == 0) 4961da177e4SLinus Torvalds idx_end = ~0; 4971da177e4SLinus Torvalds else 4981da177e4SLinus Torvalds idx_end = idx_start + npages - 1; 4991da177e4SLinus Torvalds 5001da177e4SLinus Torvalds next = idx_start; 501c6a556b8STrond Myklebust while (radix_tree_gang_lookup_tag(&nfsi->nfs_page_tree, (void **)&req, next, 1, NFS_PAGE_TAG_WRITEBACK)) { 5021da177e4SLinus Torvalds if (req->wb_index > idx_end) 5031da177e4SLinus Torvalds break; 5041da177e4SLinus Torvalds 5051da177e4SLinus Torvalds next = req->wb_index + 1; 506c6a556b8STrond Myklebust BUG_ON(!NFS_WBACK_BUSY(req)); 5071da177e4SLinus Torvalds 5081da177e4SLinus Torvalds atomic_inc(&req->wb_count); 5091da177e4SLinus Torvalds spin_unlock(&nfsi->req_lock); 5101da177e4SLinus Torvalds error = nfs_wait_on_request(req); 5111da177e4SLinus Torvalds nfs_release_request(req); 512c42de9ddSTrond Myklebust spin_lock(&nfsi->req_lock); 5131da177e4SLinus Torvalds if (error < 0) 5141da177e4SLinus Torvalds return error; 5151da177e4SLinus Torvalds res++; 5161da177e4SLinus Torvalds } 5171da177e4SLinus Torvalds return res; 5181da177e4SLinus Torvalds } 5191da177e4SLinus Torvalds 520c42de9ddSTrond Myklebust static int nfs_wait_on_requests(struct inode *inode, unsigned long idx_start, unsigned int npages) 521c42de9ddSTrond Myklebust { 522c42de9ddSTrond Myklebust struct nfs_inode *nfsi = NFS_I(inode); 523c42de9ddSTrond Myklebust int ret; 524c42de9ddSTrond Myklebust 525c42de9ddSTrond Myklebust spin_lock(&nfsi->req_lock); 526c42de9ddSTrond Myklebust ret = nfs_wait_on_requests_locked(inode, idx_start, npages); 527c42de9ddSTrond Myklebust spin_unlock(&nfsi->req_lock); 528c42de9ddSTrond Myklebust return ret; 529c42de9ddSTrond Myklebust } 530c42de9ddSTrond Myklebust 53183715ad5STrond Myklebust static void nfs_cancel_dirty_list(struct list_head *head) 532d2ccddf0STrond Myklebust { 533d2ccddf0STrond Myklebust struct nfs_page *req; 534d2ccddf0STrond Myklebust while(!list_empty(head)) { 535d2ccddf0STrond Myklebust req = nfs_list_entry(head->next); 536d2ccddf0STrond Myklebust nfs_list_remove_request(req); 537d2ccddf0STrond Myklebust nfs_inode_remove_request(req); 538d2ccddf0STrond Myklebust nfs_clear_page_writeback(req); 539d2ccddf0STrond Myklebust } 540d2ccddf0STrond Myklebust } 541d2ccddf0STrond Myklebust 54283715ad5STrond Myklebust static void nfs_cancel_commit_list(struct list_head *head) 54383715ad5STrond Myklebust { 54483715ad5STrond Myklebust struct nfs_page *req; 54583715ad5STrond Myklebust 54683715ad5STrond Myklebust while(!list_empty(head)) { 54783715ad5STrond Myklebust req = nfs_list_entry(head->next); 548b6dff26aSTrond Myklebust dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); 54983715ad5STrond Myklebust nfs_list_remove_request(req); 55083715ad5STrond Myklebust nfs_inode_remove_request(req); 551b6dff26aSTrond Myklebust nfs_unlock_request(req); 55283715ad5STrond Myklebust } 55383715ad5STrond Myklebust } 55483715ad5STrond Myklebust 5551da177e4SLinus Torvalds #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) 5561da177e4SLinus Torvalds /* 5571da177e4SLinus Torvalds * nfs_scan_commit - Scan an inode for commit requests 5581da177e4SLinus Torvalds * @inode: NFS inode to scan 5591da177e4SLinus Torvalds * @dst: destination list 5601da177e4SLinus Torvalds * @idx_start: lower bound of page->index to scan. 5611da177e4SLinus Torvalds * @npages: idx_start + npages sets the upper bound to scan. 5621da177e4SLinus Torvalds * 5631da177e4SLinus Torvalds * Moves requests from the inode's 'commit' request list. 5641da177e4SLinus Torvalds * The requests are *not* checked to ensure that they form a contiguous set. 5651da177e4SLinus Torvalds */ 5661da177e4SLinus Torvalds static int 5671da177e4SLinus Torvalds nfs_scan_commit(struct inode *inode, struct list_head *dst, unsigned long idx_start, unsigned int npages) 5681da177e4SLinus Torvalds { 5691da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 5703da28eb1STrond Myklebust int res = 0; 5713da28eb1STrond Myklebust 5723da28eb1STrond Myklebust if (nfsi->ncommit != 0) { 573d2ccddf0STrond Myklebust res = nfs_scan_list(nfsi, &nfsi->commit, dst, idx_start, npages); 5741da177e4SLinus Torvalds nfsi->ncommit -= res; 5751da177e4SLinus Torvalds if ((nfsi->ncommit == 0) != list_empty(&nfsi->commit)) 5761da177e4SLinus Torvalds printk(KERN_ERR "NFS: desynchronized value of nfs_i.ncommit.\n"); 5773da28eb1STrond Myklebust } 5781da177e4SLinus Torvalds return res; 5791da177e4SLinus Torvalds } 580c42de9ddSTrond Myklebust #else 581c42de9ddSTrond Myklebust static inline int nfs_scan_commit(struct inode *inode, struct list_head *dst, unsigned long idx_start, unsigned int npages) 582c42de9ddSTrond Myklebust { 583c42de9ddSTrond Myklebust return 0; 584c42de9ddSTrond Myklebust } 5851da177e4SLinus Torvalds #endif 5861da177e4SLinus Torvalds 5871da177e4SLinus Torvalds static int nfs_wait_on_write_congestion(struct address_space *mapping, int intr) 5881da177e4SLinus Torvalds { 5891da177e4SLinus Torvalds struct backing_dev_info *bdi = mapping->backing_dev_info; 5901da177e4SLinus Torvalds DEFINE_WAIT(wait); 5911da177e4SLinus Torvalds int ret = 0; 5921da177e4SLinus Torvalds 5931da177e4SLinus Torvalds might_sleep(); 5941da177e4SLinus Torvalds 5951da177e4SLinus Torvalds if (!bdi_write_congested(bdi)) 5961da177e4SLinus Torvalds return 0; 59791d5b470SChuck Lever 59891d5b470SChuck Lever nfs_inc_stats(mapping->host, NFSIOS_CONGESTIONWAIT); 59991d5b470SChuck Lever 6001da177e4SLinus Torvalds if (intr) { 6011da177e4SLinus Torvalds struct rpc_clnt *clnt = NFS_CLIENT(mapping->host); 6021da177e4SLinus Torvalds sigset_t oldset; 6031da177e4SLinus Torvalds 6041da177e4SLinus Torvalds rpc_clnt_sigmask(clnt, &oldset); 6051da177e4SLinus Torvalds prepare_to_wait(&nfs_write_congestion, &wait, TASK_INTERRUPTIBLE); 6061da177e4SLinus Torvalds if (bdi_write_congested(bdi)) { 6071da177e4SLinus Torvalds if (signalled()) 6081da177e4SLinus Torvalds ret = -ERESTARTSYS; 6091da177e4SLinus Torvalds else 6101da177e4SLinus Torvalds schedule(); 6111da177e4SLinus Torvalds } 6121da177e4SLinus Torvalds rpc_clnt_sigunmask(clnt, &oldset); 6131da177e4SLinus Torvalds } else { 6141da177e4SLinus Torvalds prepare_to_wait(&nfs_write_congestion, &wait, TASK_UNINTERRUPTIBLE); 6151da177e4SLinus Torvalds if (bdi_write_congested(bdi)) 6161da177e4SLinus Torvalds schedule(); 6171da177e4SLinus Torvalds } 6181da177e4SLinus Torvalds finish_wait(&nfs_write_congestion, &wait); 6191da177e4SLinus Torvalds return ret; 6201da177e4SLinus Torvalds } 6211da177e4SLinus Torvalds 6221da177e4SLinus Torvalds 6231da177e4SLinus Torvalds /* 6241da177e4SLinus Torvalds * Try to update any existing write request, or create one if there is none. 6251da177e4SLinus Torvalds * In order to match, the request's credentials must match those of 6261da177e4SLinus Torvalds * the calling process. 6271da177e4SLinus Torvalds * 6281da177e4SLinus Torvalds * Note: Should always be called with the Page Lock held! 6291da177e4SLinus Torvalds */ 6301da177e4SLinus Torvalds static struct nfs_page * nfs_update_request(struct nfs_open_context* ctx, 631e21195a7STrond Myklebust struct page *page, unsigned int offset, unsigned int bytes) 6321da177e4SLinus Torvalds { 633e21195a7STrond Myklebust struct inode *inode = page->mapping->host; 6341da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 6351da177e4SLinus Torvalds struct nfs_page *req, *new = NULL; 6361da177e4SLinus Torvalds unsigned long rqend, end; 6371da177e4SLinus Torvalds 6381da177e4SLinus Torvalds end = offset + bytes; 6391da177e4SLinus Torvalds 640e21195a7STrond Myklebust if (nfs_wait_on_write_congestion(page->mapping, NFS_SERVER(inode)->flags & NFS_MOUNT_INTR)) 6411da177e4SLinus Torvalds return ERR_PTR(-ERESTARTSYS); 6421da177e4SLinus Torvalds for (;;) { 6431da177e4SLinus Torvalds /* Loop over all inode entries and see if we find 6441da177e4SLinus Torvalds * A request for the page we wish to update 6451da177e4SLinus Torvalds */ 6461da177e4SLinus Torvalds spin_lock(&nfsi->req_lock); 647277459d2STrond Myklebust req = nfs_page_find_request_locked(page); 6481da177e4SLinus Torvalds if (req) { 6491da177e4SLinus Torvalds if (!nfs_lock_request_dontget(req)) { 6501da177e4SLinus Torvalds int error; 651277459d2STrond Myklebust 6521da177e4SLinus Torvalds spin_unlock(&nfsi->req_lock); 6531da177e4SLinus Torvalds error = nfs_wait_on_request(req); 6541da177e4SLinus Torvalds nfs_release_request(req); 6551dd594b2SNeil Brown if (error < 0) { 6561dd594b2SNeil Brown if (new) 6571dd594b2SNeil Brown nfs_release_request(new); 6581da177e4SLinus Torvalds return ERR_PTR(error); 6591dd594b2SNeil Brown } 6601da177e4SLinus Torvalds continue; 6611da177e4SLinus Torvalds } 6621da177e4SLinus Torvalds spin_unlock(&nfsi->req_lock); 6631da177e4SLinus Torvalds if (new) 6641da177e4SLinus Torvalds nfs_release_request(new); 6651da177e4SLinus Torvalds break; 6661da177e4SLinus Torvalds } 6671da177e4SLinus Torvalds 6681da177e4SLinus Torvalds if (new) { 6691da177e4SLinus Torvalds int error; 6701da177e4SLinus Torvalds nfs_lock_request_dontget(new); 6711da177e4SLinus Torvalds error = nfs_inode_add_request(inode, new); 6721da177e4SLinus Torvalds if (error) { 6731da177e4SLinus Torvalds spin_unlock(&nfsi->req_lock); 6741da177e4SLinus Torvalds nfs_unlock_request(new); 6751da177e4SLinus Torvalds return ERR_PTR(error); 6761da177e4SLinus Torvalds } 6771da177e4SLinus Torvalds spin_unlock(&nfsi->req_lock); 6781da177e4SLinus Torvalds return new; 6791da177e4SLinus Torvalds } 6801da177e4SLinus Torvalds spin_unlock(&nfsi->req_lock); 6811da177e4SLinus Torvalds 6821da177e4SLinus Torvalds new = nfs_create_request(ctx, inode, page, offset, bytes); 6831da177e4SLinus Torvalds if (IS_ERR(new)) 6841da177e4SLinus Torvalds return new; 6851da177e4SLinus Torvalds } 6861da177e4SLinus Torvalds 6871da177e4SLinus Torvalds /* We have a request for our page. 6881da177e4SLinus Torvalds * If the creds don't match, or the 6891da177e4SLinus Torvalds * page addresses don't match, 6901da177e4SLinus Torvalds * tell the caller to wait on the conflicting 6911da177e4SLinus Torvalds * request. 6921da177e4SLinus Torvalds */ 6931da177e4SLinus Torvalds rqend = req->wb_offset + req->wb_bytes; 6941da177e4SLinus Torvalds if (req->wb_context != ctx 6951da177e4SLinus Torvalds || req->wb_page != page 6961da177e4SLinus Torvalds || !nfs_dirty_request(req) 6971da177e4SLinus Torvalds || offset > rqend || end < req->wb_offset) { 6981da177e4SLinus Torvalds nfs_unlock_request(req); 6991da177e4SLinus Torvalds return ERR_PTR(-EBUSY); 7001da177e4SLinus Torvalds } 7011da177e4SLinus Torvalds 7021da177e4SLinus Torvalds /* Okay, the request matches. Update the region */ 7031da177e4SLinus Torvalds if (offset < req->wb_offset) { 7041da177e4SLinus Torvalds req->wb_offset = offset; 7051da177e4SLinus Torvalds req->wb_pgbase = offset; 7061da177e4SLinus Torvalds req->wb_bytes = rqend - req->wb_offset; 7071da177e4SLinus Torvalds } 7081da177e4SLinus Torvalds 7091da177e4SLinus Torvalds if (end > rqend) 7101da177e4SLinus Torvalds req->wb_bytes = end - req->wb_offset; 7111da177e4SLinus Torvalds 7121da177e4SLinus Torvalds return req; 7131da177e4SLinus Torvalds } 7141da177e4SLinus Torvalds 7151da177e4SLinus Torvalds int nfs_flush_incompatible(struct file *file, struct page *page) 7161da177e4SLinus Torvalds { 7171da177e4SLinus Torvalds struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data; 7181da177e4SLinus Torvalds struct nfs_page *req; 7191a54533eSTrond Myklebust int do_flush, status; 7201da177e4SLinus Torvalds /* 7211da177e4SLinus Torvalds * Look for a request corresponding to this page. If there 7221da177e4SLinus Torvalds * is one, and it belongs to another file, we flush it out 7231da177e4SLinus Torvalds * before we try to copy anything into the page. Do this 7241da177e4SLinus Torvalds * due to the lack of an ACCESS-type call in NFSv2. 7251da177e4SLinus Torvalds * Also do the same if we find a request from an existing 7261da177e4SLinus Torvalds * dropped page. 7271da177e4SLinus Torvalds */ 7281a54533eSTrond Myklebust do { 729277459d2STrond Myklebust req = nfs_page_find_request(page); 7301a54533eSTrond Myklebust if (req == NULL) 7311a54533eSTrond Myklebust return 0; 7321a54533eSTrond Myklebust do_flush = req->wb_page != page || req->wb_context != ctx 733e261f51fSTrond Myklebust || !nfs_dirty_request(req); 7341da177e4SLinus Torvalds nfs_release_request(req); 7351a54533eSTrond Myklebust if (!do_flush) 7361a54533eSTrond Myklebust return 0; 737277459d2STrond Myklebust status = nfs_wb_page(page->mapping->host, page); 7381a54533eSTrond Myklebust } while (status == 0); 7391a54533eSTrond Myklebust return status; 7401da177e4SLinus Torvalds } 7411da177e4SLinus Torvalds 7421da177e4SLinus Torvalds /* 7431da177e4SLinus Torvalds * Update and possibly write a cached page of an NFS file. 7441da177e4SLinus Torvalds * 7451da177e4SLinus Torvalds * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad 7461da177e4SLinus Torvalds * things with a page scheduled for an RPC call (e.g. invalidate it). 7471da177e4SLinus Torvalds */ 7481da177e4SLinus Torvalds int nfs_updatepage(struct file *file, struct page *page, 7491da177e4SLinus Torvalds unsigned int offset, unsigned int count) 7501da177e4SLinus Torvalds { 7511da177e4SLinus Torvalds struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data; 7521da177e4SLinus Torvalds struct inode *inode = page->mapping->host; 7531da177e4SLinus Torvalds int status = 0; 7541da177e4SLinus Torvalds 75591d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE); 75691d5b470SChuck Lever 7571da177e4SLinus Torvalds dprintk("NFS: nfs_updatepage(%s/%s %d@%Ld)\n", 7580bbacc40SChuck Lever file->f_dentry->d_parent->d_name.name, 7590bbacc40SChuck Lever file->f_dentry->d_name.name, count, 7600bbacc40SChuck Lever (long long)(page_offset(page) +offset)); 7611da177e4SLinus Torvalds 7621da177e4SLinus Torvalds /* If we're not using byte range locks, and we know the page 7631da177e4SLinus Torvalds * is entirely in cache, it may be more efficient to avoid 7641da177e4SLinus Torvalds * fragmenting write requests. 7651da177e4SLinus Torvalds */ 766ab0a3dbeSTrond Myklebust if (PageUptodate(page) && inode->i_flock == NULL && !(file->f_mode & O_SYNC)) { 76749a70f27STrond Myklebust count = max(count + offset, nfs_page_length(page)); 7681da177e4SLinus Torvalds offset = 0; 7691da177e4SLinus Torvalds } 7701da177e4SLinus Torvalds 771e21195a7STrond Myklebust status = nfs_writepage_setup(ctx, page, offset, count); 772e261f51fSTrond Myklebust __set_page_dirty_nobuffers(page); 7731da177e4SLinus Torvalds 7741da177e4SLinus Torvalds dprintk("NFS: nfs_updatepage returns %d (isize %Ld)\n", 7751da177e4SLinus Torvalds status, (long long)i_size_read(inode)); 7761da177e4SLinus Torvalds if (status < 0) 7771da177e4SLinus Torvalds ClearPageUptodate(page); 7781da177e4SLinus Torvalds return status; 7791da177e4SLinus Torvalds } 7801da177e4SLinus Torvalds 7811da177e4SLinus Torvalds static void nfs_writepage_release(struct nfs_page *req) 7821da177e4SLinus Torvalds { 7831da177e4SLinus Torvalds end_page_writeback(req->wb_page); 7841da177e4SLinus Torvalds 7851da177e4SLinus Torvalds #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) 7861da177e4SLinus Torvalds if (!PageError(req->wb_page)) { 7871da177e4SLinus Torvalds if (NFS_NEED_RESCHED(req)) { 78861822ab5STrond Myklebust nfs_redirty_request(req); 7891da177e4SLinus Torvalds goto out; 7901da177e4SLinus Torvalds } else if (NFS_NEED_COMMIT(req)) { 7911da177e4SLinus Torvalds nfs_mark_request_commit(req); 7921da177e4SLinus Torvalds goto out; 7931da177e4SLinus Torvalds } 7941da177e4SLinus Torvalds } 7951da177e4SLinus Torvalds nfs_inode_remove_request(req); 7961da177e4SLinus Torvalds 7971da177e4SLinus Torvalds out: 7981da177e4SLinus Torvalds nfs_clear_commit(req); 7991da177e4SLinus Torvalds nfs_clear_reschedule(req); 8001da177e4SLinus Torvalds #else 8011da177e4SLinus Torvalds nfs_inode_remove_request(req); 8021da177e4SLinus Torvalds #endif 803c6a556b8STrond Myklebust nfs_clear_page_writeback(req); 8041da177e4SLinus Torvalds } 8051da177e4SLinus Torvalds 8061da177e4SLinus Torvalds static inline int flush_task_priority(int how) 8071da177e4SLinus Torvalds { 8081da177e4SLinus Torvalds switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) { 8091da177e4SLinus Torvalds case FLUSH_HIGHPRI: 8101da177e4SLinus Torvalds return RPC_PRIORITY_HIGH; 8111da177e4SLinus Torvalds case FLUSH_LOWPRI: 8121da177e4SLinus Torvalds return RPC_PRIORITY_LOW; 8131da177e4SLinus Torvalds } 8141da177e4SLinus Torvalds return RPC_PRIORITY_NORMAL; 8151da177e4SLinus Torvalds } 8161da177e4SLinus Torvalds 8171da177e4SLinus Torvalds /* 8181da177e4SLinus Torvalds * Set up the argument/result storage required for the RPC call. 8191da177e4SLinus Torvalds */ 8201da177e4SLinus Torvalds static void nfs_write_rpcsetup(struct nfs_page *req, 8211da177e4SLinus Torvalds struct nfs_write_data *data, 822788e7a89STrond Myklebust const struct rpc_call_ops *call_ops, 8231da177e4SLinus Torvalds unsigned int count, unsigned int offset, 8241da177e4SLinus Torvalds int how) 8251da177e4SLinus Torvalds { 8261da177e4SLinus Torvalds struct inode *inode; 827788e7a89STrond Myklebust int flags; 8281da177e4SLinus Torvalds 8291da177e4SLinus Torvalds /* Set up the RPC argument and reply structs 8301da177e4SLinus Torvalds * NB: take care not to mess about with data->commit et al. */ 8311da177e4SLinus Torvalds 8321da177e4SLinus Torvalds data->req = req; 8331da177e4SLinus Torvalds data->inode = inode = req->wb_context->dentry->d_inode; 8341da177e4SLinus Torvalds data->cred = req->wb_context->cred; 8351da177e4SLinus Torvalds 8361da177e4SLinus Torvalds data->args.fh = NFS_FH(inode); 8371da177e4SLinus Torvalds data->args.offset = req_offset(req) + offset; 8381da177e4SLinus Torvalds data->args.pgbase = req->wb_pgbase + offset; 8391da177e4SLinus Torvalds data->args.pages = data->pagevec; 8401da177e4SLinus Torvalds data->args.count = count; 8411da177e4SLinus Torvalds data->args.context = req->wb_context; 8421da177e4SLinus Torvalds 8431da177e4SLinus Torvalds data->res.fattr = &data->fattr; 8441da177e4SLinus Torvalds data->res.count = count; 8451da177e4SLinus Torvalds data->res.verf = &data->verf; 8460e574af1STrond Myklebust nfs_fattr_init(&data->fattr); 8471da177e4SLinus Torvalds 848788e7a89STrond Myklebust /* Set up the initial task struct. */ 849788e7a89STrond Myklebust flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; 850788e7a89STrond Myklebust rpc_init_task(&data->task, NFS_CLIENT(inode), flags, call_ops, data); 8511da177e4SLinus Torvalds NFS_PROTO(inode)->write_setup(data, how); 8521da177e4SLinus Torvalds 8531da177e4SLinus Torvalds data->task.tk_priority = flush_task_priority(how); 8541da177e4SLinus Torvalds data->task.tk_cookie = (unsigned long)inode; 8551da177e4SLinus Torvalds 8561da177e4SLinus Torvalds dprintk("NFS: %4d initiated write call (req %s/%Ld, %u bytes @ offset %Lu)\n", 8570bbacc40SChuck Lever data->task.tk_pid, 8581da177e4SLinus Torvalds inode->i_sb->s_id, 8591da177e4SLinus Torvalds (long long)NFS_FILEID(inode), 8601da177e4SLinus Torvalds count, 8611da177e4SLinus Torvalds (unsigned long long)data->args.offset); 8621da177e4SLinus Torvalds } 8631da177e4SLinus Torvalds 8641da177e4SLinus Torvalds static void nfs_execute_write(struct nfs_write_data *data) 8651da177e4SLinus Torvalds { 8661da177e4SLinus Torvalds struct rpc_clnt *clnt = NFS_CLIENT(data->inode); 8671da177e4SLinus Torvalds sigset_t oldset; 8681da177e4SLinus Torvalds 8691da177e4SLinus Torvalds rpc_clnt_sigmask(clnt, &oldset); 8701da177e4SLinus Torvalds rpc_execute(&data->task); 8711da177e4SLinus Torvalds rpc_clnt_sigunmask(clnt, &oldset); 8721da177e4SLinus Torvalds } 8731da177e4SLinus Torvalds 8741da177e4SLinus Torvalds /* 8751da177e4SLinus Torvalds * Generate multiple small requests to write out a single 8761da177e4SLinus Torvalds * contiguous dirty area on one page. 8771da177e4SLinus Torvalds */ 8787d46a49fSTrond Myklebust static int nfs_flush_multi(struct inode *inode, struct list_head *head, int how) 8791da177e4SLinus Torvalds { 8801da177e4SLinus Torvalds struct nfs_page *req = nfs_list_entry(head->next); 8811da177e4SLinus Torvalds struct page *page = req->wb_page; 8821da177e4SLinus Torvalds struct nfs_write_data *data; 883e9f7bee1STrond Myklebust size_t wsize = NFS_SERVER(inode)->wsize, nbytes; 884e9f7bee1STrond Myklebust unsigned int offset; 8851da177e4SLinus Torvalds int requests = 0; 8861da177e4SLinus Torvalds LIST_HEAD(list); 8871da177e4SLinus Torvalds 8881da177e4SLinus Torvalds nfs_list_remove_request(req); 8891da177e4SLinus Torvalds 8901da177e4SLinus Torvalds nbytes = req->wb_bytes; 891e9f7bee1STrond Myklebust do { 892e9f7bee1STrond Myklebust size_t len = min(nbytes, wsize); 893e9f7bee1STrond Myklebust 894e9f7bee1STrond Myklebust data = nfs_writedata_alloc(len); 8951da177e4SLinus Torvalds if (!data) 8961da177e4SLinus Torvalds goto out_bad; 8971da177e4SLinus Torvalds list_add(&data->pages, &list); 8981da177e4SLinus Torvalds requests++; 899e9f7bee1STrond Myklebust nbytes -= len; 900e9f7bee1STrond Myklebust } while (nbytes != 0); 9011da177e4SLinus Torvalds atomic_set(&req->wb_complete, requests); 9021da177e4SLinus Torvalds 9031da177e4SLinus Torvalds ClearPageError(page); 9041da177e4SLinus Torvalds offset = 0; 9051da177e4SLinus Torvalds nbytes = req->wb_bytes; 9061da177e4SLinus Torvalds do { 9071da177e4SLinus Torvalds data = list_entry(list.next, struct nfs_write_data, pages); 9081da177e4SLinus Torvalds list_del_init(&data->pages); 9091da177e4SLinus Torvalds 9101da177e4SLinus Torvalds data->pagevec[0] = page; 9111da177e4SLinus Torvalds 9121da177e4SLinus Torvalds if (nbytes > wsize) { 913788e7a89STrond Myklebust nfs_write_rpcsetup(req, data, &nfs_write_partial_ops, 914788e7a89STrond Myklebust wsize, offset, how); 9151da177e4SLinus Torvalds offset += wsize; 9161da177e4SLinus Torvalds nbytes -= wsize; 9171da177e4SLinus Torvalds } else { 918788e7a89STrond Myklebust nfs_write_rpcsetup(req, data, &nfs_write_partial_ops, 919788e7a89STrond Myklebust nbytes, offset, how); 9201da177e4SLinus Torvalds nbytes = 0; 9211da177e4SLinus Torvalds } 9221da177e4SLinus Torvalds nfs_execute_write(data); 9231da177e4SLinus Torvalds } while (nbytes != 0); 9241da177e4SLinus Torvalds 9251da177e4SLinus Torvalds return 0; 9261da177e4SLinus Torvalds 9271da177e4SLinus Torvalds out_bad: 9281da177e4SLinus Torvalds while (!list_empty(&list)) { 9291da177e4SLinus Torvalds data = list_entry(list.next, struct nfs_write_data, pages); 9301da177e4SLinus Torvalds list_del(&data->pages); 9318aca67f0STrond Myklebust nfs_writedata_release(data); 9321da177e4SLinus Torvalds } 93361822ab5STrond Myklebust nfs_redirty_request(req); 934c6a556b8STrond Myklebust nfs_clear_page_writeback(req); 9351da177e4SLinus Torvalds return -ENOMEM; 9361da177e4SLinus Torvalds } 9371da177e4SLinus Torvalds 9381da177e4SLinus Torvalds /* 9391da177e4SLinus Torvalds * Create an RPC task for the given write request and kick it. 9401da177e4SLinus Torvalds * The page must have been locked by the caller. 9411da177e4SLinus Torvalds * 9421da177e4SLinus Torvalds * It may happen that the page we're passed is not marked dirty. 9431da177e4SLinus Torvalds * This is the case if nfs_updatepage detects a conflicting request 9441da177e4SLinus Torvalds * that has been written but not committed. 9451da177e4SLinus Torvalds */ 9467d46a49fSTrond Myklebust static int nfs_flush_one(struct inode *inode, struct list_head *head, int how) 9471da177e4SLinus Torvalds { 9481da177e4SLinus Torvalds struct nfs_page *req; 9491da177e4SLinus Torvalds struct page **pages; 9501da177e4SLinus Torvalds struct nfs_write_data *data; 9511da177e4SLinus Torvalds unsigned int count; 9521da177e4SLinus Torvalds 953e9f7bee1STrond Myklebust data = nfs_writedata_alloc(NFS_SERVER(inode)->wsize); 9541da177e4SLinus Torvalds if (!data) 9551da177e4SLinus Torvalds goto out_bad; 9561da177e4SLinus Torvalds 9571da177e4SLinus Torvalds pages = data->pagevec; 9581da177e4SLinus Torvalds count = 0; 9591da177e4SLinus Torvalds while (!list_empty(head)) { 9601da177e4SLinus Torvalds req = nfs_list_entry(head->next); 9611da177e4SLinus Torvalds nfs_list_remove_request(req); 9621da177e4SLinus Torvalds nfs_list_add_request(req, &data->pages); 9631da177e4SLinus Torvalds ClearPageError(req->wb_page); 9641da177e4SLinus Torvalds *pages++ = req->wb_page; 9651da177e4SLinus Torvalds count += req->wb_bytes; 9661da177e4SLinus Torvalds } 9671da177e4SLinus Torvalds req = nfs_list_entry(data->pages.next); 9681da177e4SLinus Torvalds 9691da177e4SLinus Torvalds /* Set up the argument struct */ 970788e7a89STrond Myklebust nfs_write_rpcsetup(req, data, &nfs_write_full_ops, count, 0, how); 9711da177e4SLinus Torvalds 9721da177e4SLinus Torvalds nfs_execute_write(data); 9731da177e4SLinus Torvalds return 0; 9741da177e4SLinus Torvalds out_bad: 9751da177e4SLinus Torvalds while (!list_empty(head)) { 9761da177e4SLinus Torvalds struct nfs_page *req = nfs_list_entry(head->next); 9771da177e4SLinus Torvalds nfs_list_remove_request(req); 97861822ab5STrond Myklebust nfs_redirty_request(req); 979c6a556b8STrond Myklebust nfs_clear_page_writeback(req); 9801da177e4SLinus Torvalds } 9811da177e4SLinus Torvalds return -ENOMEM; 9821da177e4SLinus Torvalds } 9831da177e4SLinus Torvalds 9847d46a49fSTrond Myklebust static int nfs_flush_list(struct inode *inode, struct list_head *head, int npages, int how) 9851da177e4SLinus Torvalds { 9861da177e4SLinus Torvalds LIST_HEAD(one_request); 9877d46a49fSTrond Myklebust int (*flush_one)(struct inode *, struct list_head *, int); 9881da177e4SLinus Torvalds struct nfs_page *req; 9897d46a49fSTrond Myklebust int wpages = NFS_SERVER(inode)->wpages; 9907d46a49fSTrond Myklebust int wsize = NFS_SERVER(inode)->wsize; 9917d46a49fSTrond Myklebust int error; 9921da177e4SLinus Torvalds 9937d46a49fSTrond Myklebust flush_one = nfs_flush_one; 9947d46a49fSTrond Myklebust if (wsize < PAGE_CACHE_SIZE) 9957d46a49fSTrond Myklebust flush_one = nfs_flush_multi; 9967d46a49fSTrond Myklebust /* For single writes, FLUSH_STABLE is more efficient */ 9977d46a49fSTrond Myklebust if (npages <= wpages && npages == NFS_I(inode)->npages 9987d46a49fSTrond Myklebust && nfs_list_entry(head->next)->wb_bytes <= wsize) 9997d46a49fSTrond Myklebust how |= FLUSH_STABLE; 10007d46a49fSTrond Myklebust 10017d46a49fSTrond Myklebust do { 10027d46a49fSTrond Myklebust nfs_coalesce_requests(head, &one_request, wpages); 10031da177e4SLinus Torvalds req = nfs_list_entry(one_request.next); 10047d46a49fSTrond Myklebust error = flush_one(inode, &one_request, how); 10051da177e4SLinus Torvalds if (error < 0) 10067d46a49fSTrond Myklebust goto out_err; 10077d46a49fSTrond Myklebust } while (!list_empty(head)); 10087d46a49fSTrond Myklebust return 0; 10097d46a49fSTrond Myklebust out_err: 10101da177e4SLinus Torvalds while (!list_empty(head)) { 10111da177e4SLinus Torvalds req = nfs_list_entry(head->next); 10121da177e4SLinus Torvalds nfs_list_remove_request(req); 101361822ab5STrond Myklebust nfs_redirty_request(req); 1014c6a556b8STrond Myklebust nfs_clear_page_writeback(req); 10151da177e4SLinus Torvalds } 10161da177e4SLinus Torvalds return error; 10171da177e4SLinus Torvalds } 10181da177e4SLinus Torvalds 10191da177e4SLinus Torvalds /* 10201da177e4SLinus Torvalds * Handle a write reply that flushed part of a page. 10211da177e4SLinus Torvalds */ 1022788e7a89STrond Myklebust static void nfs_writeback_done_partial(struct rpc_task *task, void *calldata) 10231da177e4SLinus Torvalds { 1024788e7a89STrond Myklebust struct nfs_write_data *data = calldata; 10251da177e4SLinus Torvalds struct nfs_page *req = data->req; 10261da177e4SLinus Torvalds struct page *page = req->wb_page; 10271da177e4SLinus Torvalds 10281da177e4SLinus Torvalds dprintk("NFS: write (%s/%Ld %d@%Ld)", 10291da177e4SLinus Torvalds req->wb_context->dentry->d_inode->i_sb->s_id, 10301da177e4SLinus Torvalds (long long)NFS_FILEID(req->wb_context->dentry->d_inode), 10311da177e4SLinus Torvalds req->wb_bytes, 10321da177e4SLinus Torvalds (long long)req_offset(req)); 10331da177e4SLinus Torvalds 1034788e7a89STrond Myklebust if (nfs_writeback_done(task, data) != 0) 1035788e7a89STrond Myklebust return; 1036788e7a89STrond Myklebust 1037788e7a89STrond Myklebust if (task->tk_status < 0) { 10381da177e4SLinus Torvalds ClearPageUptodate(page); 10391da177e4SLinus Torvalds SetPageError(page); 1040788e7a89STrond Myklebust req->wb_context->error = task->tk_status; 1041788e7a89STrond Myklebust dprintk(", error = %d\n", task->tk_status); 10421da177e4SLinus Torvalds } else { 10431da177e4SLinus Torvalds #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) 10441da177e4SLinus Torvalds if (data->verf.committed < NFS_FILE_SYNC) { 10451da177e4SLinus Torvalds if (!NFS_NEED_COMMIT(req)) { 10461da177e4SLinus Torvalds nfs_defer_commit(req); 10471da177e4SLinus Torvalds memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); 10481da177e4SLinus Torvalds dprintk(" defer commit\n"); 10491da177e4SLinus Torvalds } else if (memcmp(&req->wb_verf, &data->verf, sizeof(req->wb_verf))) { 10501da177e4SLinus Torvalds nfs_defer_reschedule(req); 10511da177e4SLinus Torvalds dprintk(" server reboot detected\n"); 10521da177e4SLinus Torvalds } 10531da177e4SLinus Torvalds } else 10541da177e4SLinus Torvalds #endif 10551da177e4SLinus Torvalds dprintk(" OK\n"); 10561da177e4SLinus Torvalds } 10571da177e4SLinus Torvalds 10581da177e4SLinus Torvalds if (atomic_dec_and_test(&req->wb_complete)) 10591da177e4SLinus Torvalds nfs_writepage_release(req); 10601da177e4SLinus Torvalds } 10611da177e4SLinus Torvalds 1062788e7a89STrond Myklebust static const struct rpc_call_ops nfs_write_partial_ops = { 1063788e7a89STrond Myklebust .rpc_call_done = nfs_writeback_done_partial, 1064788e7a89STrond Myklebust .rpc_release = nfs_writedata_release, 1065788e7a89STrond Myklebust }; 1066788e7a89STrond Myklebust 10671da177e4SLinus Torvalds /* 10681da177e4SLinus Torvalds * Handle a write reply that flushes a whole page. 10691da177e4SLinus Torvalds * 10701da177e4SLinus Torvalds * FIXME: There is an inherent race with invalidate_inode_pages and 10711da177e4SLinus Torvalds * writebacks since the page->count is kept > 1 for as long 10721da177e4SLinus Torvalds * as the page has a write request pending. 10731da177e4SLinus Torvalds */ 1074788e7a89STrond Myklebust static void nfs_writeback_done_full(struct rpc_task *task, void *calldata) 10751da177e4SLinus Torvalds { 1076788e7a89STrond Myklebust struct nfs_write_data *data = calldata; 10771da177e4SLinus Torvalds struct nfs_page *req; 10781da177e4SLinus Torvalds struct page *page; 10791da177e4SLinus Torvalds 1080788e7a89STrond Myklebust if (nfs_writeback_done(task, data) != 0) 1081788e7a89STrond Myklebust return; 1082788e7a89STrond Myklebust 10831da177e4SLinus Torvalds /* Update attributes as result of writeback. */ 10841da177e4SLinus Torvalds while (!list_empty(&data->pages)) { 10851da177e4SLinus Torvalds req = nfs_list_entry(data->pages.next); 10861da177e4SLinus Torvalds nfs_list_remove_request(req); 10871da177e4SLinus Torvalds page = req->wb_page; 10881da177e4SLinus Torvalds 10891da177e4SLinus Torvalds dprintk("NFS: write (%s/%Ld %d@%Ld)", 10901da177e4SLinus Torvalds req->wb_context->dentry->d_inode->i_sb->s_id, 10911da177e4SLinus Torvalds (long long)NFS_FILEID(req->wb_context->dentry->d_inode), 10921da177e4SLinus Torvalds req->wb_bytes, 10931da177e4SLinus Torvalds (long long)req_offset(req)); 10941da177e4SLinus Torvalds 1095788e7a89STrond Myklebust if (task->tk_status < 0) { 10961da177e4SLinus Torvalds ClearPageUptodate(page); 10971da177e4SLinus Torvalds SetPageError(page); 1098788e7a89STrond Myklebust req->wb_context->error = task->tk_status; 10991da177e4SLinus Torvalds end_page_writeback(page); 11001da177e4SLinus Torvalds nfs_inode_remove_request(req); 1101788e7a89STrond Myklebust dprintk(", error = %d\n", task->tk_status); 11021da177e4SLinus Torvalds goto next; 11031da177e4SLinus Torvalds } 11041da177e4SLinus Torvalds end_page_writeback(page); 11051da177e4SLinus Torvalds 11061da177e4SLinus Torvalds #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) 11071da177e4SLinus Torvalds if (data->args.stable != NFS_UNSTABLE || data->verf.committed == NFS_FILE_SYNC) { 11081da177e4SLinus Torvalds nfs_inode_remove_request(req); 11091da177e4SLinus Torvalds dprintk(" OK\n"); 11101da177e4SLinus Torvalds goto next; 11111da177e4SLinus Torvalds } 11121da177e4SLinus Torvalds memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); 11131da177e4SLinus Torvalds nfs_mark_request_commit(req); 11141da177e4SLinus Torvalds dprintk(" marked for commit\n"); 11151da177e4SLinus Torvalds #else 11161da177e4SLinus Torvalds nfs_inode_remove_request(req); 11171da177e4SLinus Torvalds #endif 11181da177e4SLinus Torvalds next: 1119c6a556b8STrond Myklebust nfs_clear_page_writeback(req); 11201da177e4SLinus Torvalds } 11211da177e4SLinus Torvalds } 11221da177e4SLinus Torvalds 1123788e7a89STrond Myklebust static const struct rpc_call_ops nfs_write_full_ops = { 1124788e7a89STrond Myklebust .rpc_call_done = nfs_writeback_done_full, 1125788e7a89STrond Myklebust .rpc_release = nfs_writedata_release, 1126788e7a89STrond Myklebust }; 1127788e7a89STrond Myklebust 1128788e7a89STrond Myklebust 11291da177e4SLinus Torvalds /* 11301da177e4SLinus Torvalds * This function is called when the WRITE call is complete. 11311da177e4SLinus Torvalds */ 1132462d5b32SChuck Lever int nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data) 11331da177e4SLinus Torvalds { 11341da177e4SLinus Torvalds struct nfs_writeargs *argp = &data->args; 11351da177e4SLinus Torvalds struct nfs_writeres *resp = &data->res; 1136788e7a89STrond Myklebust int status; 11371da177e4SLinus Torvalds 11381da177e4SLinus Torvalds dprintk("NFS: %4d nfs_writeback_done (status %d)\n", 11391da177e4SLinus Torvalds task->tk_pid, task->tk_status); 11401da177e4SLinus Torvalds 1141f551e44fSChuck Lever /* 1142f551e44fSChuck Lever * ->write_done will attempt to use post-op attributes to detect 1143f551e44fSChuck Lever * conflicting writes by other clients. A strict interpretation 1144f551e44fSChuck Lever * of close-to-open would allow us to continue caching even if 1145f551e44fSChuck Lever * another writer had changed the file, but some applications 1146f551e44fSChuck Lever * depend on tighter cache coherency when writing. 1147f551e44fSChuck Lever */ 1148788e7a89STrond Myklebust status = NFS_PROTO(data->inode)->write_done(task, data); 1149788e7a89STrond Myklebust if (status != 0) 1150788e7a89STrond Myklebust return status; 115191d5b470SChuck Lever nfs_add_stats(data->inode, NFSIOS_SERVERWRITTENBYTES, resp->count); 115291d5b470SChuck Lever 11531da177e4SLinus Torvalds #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) 11541da177e4SLinus Torvalds if (resp->verf->committed < argp->stable && task->tk_status >= 0) { 11551da177e4SLinus Torvalds /* We tried a write call, but the server did not 11561da177e4SLinus Torvalds * commit data to stable storage even though we 11571da177e4SLinus Torvalds * requested it. 11581da177e4SLinus Torvalds * Note: There is a known bug in Tru64 < 5.0 in which 11591da177e4SLinus Torvalds * the server reports NFS_DATA_SYNC, but performs 11601da177e4SLinus Torvalds * NFS_FILE_SYNC. We therefore implement this checking 11611da177e4SLinus Torvalds * as a dprintk() in order to avoid filling syslog. 11621da177e4SLinus Torvalds */ 11631da177e4SLinus Torvalds static unsigned long complain; 11641da177e4SLinus Torvalds 11651da177e4SLinus Torvalds if (time_before(complain, jiffies)) { 11661da177e4SLinus Torvalds dprintk("NFS: faulty NFS server %s:" 11671da177e4SLinus Torvalds " (committed = %d) != (stable = %d)\n", 116854ceac45SDavid Howells NFS_SERVER(data->inode)->nfs_client->cl_hostname, 11691da177e4SLinus Torvalds resp->verf->committed, argp->stable); 11701da177e4SLinus Torvalds complain = jiffies + 300 * HZ; 11711da177e4SLinus Torvalds } 11721da177e4SLinus Torvalds } 11731da177e4SLinus Torvalds #endif 11741da177e4SLinus Torvalds /* Is this a short write? */ 11751da177e4SLinus Torvalds if (task->tk_status >= 0 && resp->count < argp->count) { 11761da177e4SLinus Torvalds static unsigned long complain; 11771da177e4SLinus Torvalds 117891d5b470SChuck Lever nfs_inc_stats(data->inode, NFSIOS_SHORTWRITE); 117991d5b470SChuck Lever 11801da177e4SLinus Torvalds /* Has the server at least made some progress? */ 11811da177e4SLinus Torvalds if (resp->count != 0) { 11821da177e4SLinus Torvalds /* Was this an NFSv2 write or an NFSv3 stable write? */ 11831da177e4SLinus Torvalds if (resp->verf->committed != NFS_UNSTABLE) { 11841da177e4SLinus Torvalds /* Resend from where the server left off */ 11851da177e4SLinus Torvalds argp->offset += resp->count; 11861da177e4SLinus Torvalds argp->pgbase += resp->count; 11871da177e4SLinus Torvalds argp->count -= resp->count; 11881da177e4SLinus Torvalds } else { 11891da177e4SLinus Torvalds /* Resend as a stable write in order to avoid 11901da177e4SLinus Torvalds * headaches in the case of a server crash. 11911da177e4SLinus Torvalds */ 11921da177e4SLinus Torvalds argp->stable = NFS_FILE_SYNC; 11931da177e4SLinus Torvalds } 11941da177e4SLinus Torvalds rpc_restart_call(task); 1195788e7a89STrond Myklebust return -EAGAIN; 11961da177e4SLinus Torvalds } 11971da177e4SLinus Torvalds if (time_before(complain, jiffies)) { 11981da177e4SLinus Torvalds printk(KERN_WARNING 11991da177e4SLinus Torvalds "NFS: Server wrote zero bytes, expected %u.\n", 12001da177e4SLinus Torvalds argp->count); 12011da177e4SLinus Torvalds complain = jiffies + 300 * HZ; 12021da177e4SLinus Torvalds } 12031da177e4SLinus Torvalds /* Can't do anything about it except throw an error. */ 12041da177e4SLinus Torvalds task->tk_status = -EIO; 12051da177e4SLinus Torvalds } 1206788e7a89STrond Myklebust return 0; 12071da177e4SLinus Torvalds } 12081da177e4SLinus Torvalds 12091da177e4SLinus Torvalds 12101da177e4SLinus Torvalds #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) 1211963d8fe5STrond Myklebust void nfs_commit_release(void *wdata) 12121da177e4SLinus Torvalds { 12131da177e4SLinus Torvalds nfs_commit_free(wdata); 12141da177e4SLinus Torvalds } 12151da177e4SLinus Torvalds 12161da177e4SLinus Torvalds /* 12171da177e4SLinus Torvalds * Set up the argument/result storage required for the RPC call. 12181da177e4SLinus Torvalds */ 12191da177e4SLinus Torvalds static void nfs_commit_rpcsetup(struct list_head *head, 1220788e7a89STrond Myklebust struct nfs_write_data *data, 1221788e7a89STrond Myklebust int how) 12221da177e4SLinus Torvalds { 12233da28eb1STrond Myklebust struct nfs_page *first; 12241da177e4SLinus Torvalds struct inode *inode; 1225788e7a89STrond Myklebust int flags; 12261da177e4SLinus Torvalds 12271da177e4SLinus Torvalds /* Set up the RPC argument and reply structs 12281da177e4SLinus Torvalds * NB: take care not to mess about with data->commit et al. */ 12291da177e4SLinus Torvalds 12301da177e4SLinus Torvalds list_splice_init(head, &data->pages); 12311da177e4SLinus Torvalds first = nfs_list_entry(data->pages.next); 12321da177e4SLinus Torvalds inode = first->wb_context->dentry->d_inode; 12331da177e4SLinus Torvalds 12341da177e4SLinus Torvalds data->inode = inode; 12351da177e4SLinus Torvalds data->cred = first->wb_context->cred; 12361da177e4SLinus Torvalds 12371da177e4SLinus Torvalds data->args.fh = NFS_FH(data->inode); 12383da28eb1STrond Myklebust /* Note: we always request a commit of the entire inode */ 12393da28eb1STrond Myklebust data->args.offset = 0; 12403da28eb1STrond Myklebust data->args.count = 0; 12413da28eb1STrond Myklebust data->res.count = 0; 12421da177e4SLinus Torvalds data->res.fattr = &data->fattr; 12431da177e4SLinus Torvalds data->res.verf = &data->verf; 12440e574af1STrond Myklebust nfs_fattr_init(&data->fattr); 12451da177e4SLinus Torvalds 1246788e7a89STrond Myklebust /* Set up the initial task struct. */ 1247788e7a89STrond Myklebust flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; 1248788e7a89STrond Myklebust rpc_init_task(&data->task, NFS_CLIENT(inode), flags, &nfs_commit_ops, data); 12491da177e4SLinus Torvalds NFS_PROTO(inode)->commit_setup(data, how); 12501da177e4SLinus Torvalds 12511da177e4SLinus Torvalds data->task.tk_priority = flush_task_priority(how); 12521da177e4SLinus Torvalds data->task.tk_cookie = (unsigned long)inode; 12531da177e4SLinus Torvalds 12540bbacc40SChuck Lever dprintk("NFS: %4d initiated commit call\n", data->task.tk_pid); 12551da177e4SLinus Torvalds } 12561da177e4SLinus Torvalds 12571da177e4SLinus Torvalds /* 12581da177e4SLinus Torvalds * Commit dirty pages 12591da177e4SLinus Torvalds */ 12601da177e4SLinus Torvalds static int 126140859d7eSChuck Lever nfs_commit_list(struct inode *inode, struct list_head *head, int how) 12621da177e4SLinus Torvalds { 12631da177e4SLinus Torvalds struct nfs_write_data *data; 12641da177e4SLinus Torvalds struct nfs_page *req; 12651da177e4SLinus Torvalds 1266e9f7bee1STrond Myklebust data = nfs_commit_alloc(); 12671da177e4SLinus Torvalds 12681da177e4SLinus Torvalds if (!data) 12691da177e4SLinus Torvalds goto out_bad; 12701da177e4SLinus Torvalds 12711da177e4SLinus Torvalds /* Set up the argument struct */ 12721da177e4SLinus Torvalds nfs_commit_rpcsetup(head, data, how); 12731da177e4SLinus Torvalds 12741da177e4SLinus Torvalds nfs_execute_write(data); 12751da177e4SLinus Torvalds return 0; 12761da177e4SLinus Torvalds out_bad: 12771da177e4SLinus Torvalds while (!list_empty(head)) { 12781da177e4SLinus Torvalds req = nfs_list_entry(head->next); 12791da177e4SLinus Torvalds nfs_list_remove_request(req); 12801da177e4SLinus Torvalds nfs_mark_request_commit(req); 128183715ad5STrond Myklebust dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); 12825c2d97cbSTrond Myklebust nfs_clear_page_writeback(req); 12831da177e4SLinus Torvalds } 12841da177e4SLinus Torvalds return -ENOMEM; 12851da177e4SLinus Torvalds } 12861da177e4SLinus Torvalds 12871da177e4SLinus Torvalds /* 12881da177e4SLinus Torvalds * COMMIT call returned 12891da177e4SLinus Torvalds */ 1290788e7a89STrond Myklebust static void nfs_commit_done(struct rpc_task *task, void *calldata) 12911da177e4SLinus Torvalds { 1292963d8fe5STrond Myklebust struct nfs_write_data *data = calldata; 12931da177e4SLinus Torvalds struct nfs_page *req; 12941da177e4SLinus Torvalds 12951da177e4SLinus Torvalds dprintk("NFS: %4d nfs_commit_done (status %d)\n", 12961da177e4SLinus Torvalds task->tk_pid, task->tk_status); 12971da177e4SLinus Torvalds 1298788e7a89STrond Myklebust /* Call the NFS version-specific code */ 1299788e7a89STrond Myklebust if (NFS_PROTO(data->inode)->commit_done(task, data) != 0) 1300788e7a89STrond Myklebust return; 1301788e7a89STrond Myklebust 13021da177e4SLinus Torvalds while (!list_empty(&data->pages)) { 13031da177e4SLinus Torvalds req = nfs_list_entry(data->pages.next); 13041da177e4SLinus Torvalds nfs_list_remove_request(req); 1305fd39fc85SChristoph Lameter dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); 13061da177e4SLinus Torvalds 13071da177e4SLinus Torvalds dprintk("NFS: commit (%s/%Ld %d@%Ld)", 13081da177e4SLinus Torvalds req->wb_context->dentry->d_inode->i_sb->s_id, 13091da177e4SLinus Torvalds (long long)NFS_FILEID(req->wb_context->dentry->d_inode), 13101da177e4SLinus Torvalds req->wb_bytes, 13111da177e4SLinus Torvalds (long long)req_offset(req)); 13121da177e4SLinus Torvalds if (task->tk_status < 0) { 13131da177e4SLinus Torvalds req->wb_context->error = task->tk_status; 13141da177e4SLinus Torvalds nfs_inode_remove_request(req); 13151da177e4SLinus Torvalds dprintk(", error = %d\n", task->tk_status); 13161da177e4SLinus Torvalds goto next; 13171da177e4SLinus Torvalds } 13181da177e4SLinus Torvalds 13191da177e4SLinus Torvalds /* Okay, COMMIT succeeded, apparently. Check the verifier 13201da177e4SLinus Torvalds * returned by the server against all stored verfs. */ 13211da177e4SLinus Torvalds if (!memcmp(req->wb_verf.verifier, data->verf.verifier, sizeof(data->verf.verifier))) { 13221da177e4SLinus Torvalds /* We have a match */ 13231da177e4SLinus Torvalds nfs_inode_remove_request(req); 13241da177e4SLinus Torvalds dprintk(" OK\n"); 13251da177e4SLinus Torvalds goto next; 13261da177e4SLinus Torvalds } 13271da177e4SLinus Torvalds /* We have a mismatch. Write the page again */ 13281da177e4SLinus Torvalds dprintk(" mismatch\n"); 132961822ab5STrond Myklebust nfs_redirty_request(req); 13301da177e4SLinus Torvalds next: 1331c6a556b8STrond Myklebust nfs_clear_page_writeback(req); 13321da177e4SLinus Torvalds } 13331da177e4SLinus Torvalds } 1334788e7a89STrond Myklebust 1335788e7a89STrond Myklebust static const struct rpc_call_ops nfs_commit_ops = { 1336788e7a89STrond Myklebust .rpc_call_done = nfs_commit_done, 1337788e7a89STrond Myklebust .rpc_release = nfs_commit_release, 1338788e7a89STrond Myklebust }; 1339c42de9ddSTrond Myklebust #else 1340c42de9ddSTrond Myklebust static inline int nfs_commit_list(struct inode *inode, struct list_head *head, int how) 1341c42de9ddSTrond Myklebust { 1342c42de9ddSTrond Myklebust return 0; 1343c42de9ddSTrond Myklebust } 13441da177e4SLinus Torvalds #endif 13451da177e4SLinus Torvalds 13463f442547STrond Myklebust static long nfs_flush_mapping(struct address_space *mapping, struct writeback_control *wbc, int how) 13471da177e4SLinus Torvalds { 134828c6925fSTrond Myklebust struct nfs_inode *nfsi = NFS_I(mapping->host); 13491da177e4SLinus Torvalds LIST_HEAD(head); 13503f442547STrond Myklebust long res; 13511da177e4SLinus Torvalds 13521da177e4SLinus Torvalds spin_lock(&nfsi->req_lock); 13533f442547STrond Myklebust res = nfs_scan_dirty(mapping, wbc, &head); 13541da177e4SLinus Torvalds spin_unlock(&nfsi->req_lock); 1355ab0a3dbeSTrond Myklebust if (res) { 135628c6925fSTrond Myklebust int error = nfs_flush_list(mapping->host, &head, res, how); 13571da177e4SLinus Torvalds if (error < 0) 13581da177e4SLinus Torvalds return error; 13597d46a49fSTrond Myklebust } 13601da177e4SLinus Torvalds return res; 13611da177e4SLinus Torvalds } 13621da177e4SLinus Torvalds 13631da177e4SLinus Torvalds #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) 13643da28eb1STrond Myklebust int nfs_commit_inode(struct inode *inode, int how) 13651da177e4SLinus Torvalds { 13661da177e4SLinus Torvalds struct nfs_inode *nfsi = NFS_I(inode); 13671da177e4SLinus Torvalds LIST_HEAD(head); 13687d46a49fSTrond Myklebust int res; 13691da177e4SLinus Torvalds 13701da177e4SLinus Torvalds spin_lock(&nfsi->req_lock); 13713da28eb1STrond Myklebust res = nfs_scan_commit(inode, &head, 0, 0); 13723da28eb1STrond Myklebust spin_unlock(&nfsi->req_lock); 13731da177e4SLinus Torvalds if (res) { 13747d46a49fSTrond Myklebust int error = nfs_commit_list(inode, &head, how); 13751da177e4SLinus Torvalds if (error < 0) 13761da177e4SLinus Torvalds return error; 13773da28eb1STrond Myklebust } 13781da177e4SLinus Torvalds return res; 13791da177e4SLinus Torvalds } 13801da177e4SLinus Torvalds #endif 13811da177e4SLinus Torvalds 13821c75950bSTrond Myklebust long nfs_sync_mapping_wait(struct address_space *mapping, struct writeback_control *wbc, int how) 13831da177e4SLinus Torvalds { 13841c75950bSTrond Myklebust struct inode *inode = mapping->host; 1385c42de9ddSTrond Myklebust struct nfs_inode *nfsi = NFS_I(inode); 13861c75950bSTrond Myklebust unsigned long idx_start, idx_end; 13871c75950bSTrond Myklebust unsigned int npages = 0; 1388c42de9ddSTrond Myklebust LIST_HEAD(head); 138970b9ecbdSTrond Myklebust int nocommit = how & FLUSH_NOCOMMIT; 13903f442547STrond Myklebust long pages, ret; 13911da177e4SLinus Torvalds 13921c75950bSTrond Myklebust /* FIXME */ 13931c75950bSTrond Myklebust if (wbc->range_cyclic) 13941c75950bSTrond Myklebust idx_start = 0; 13951c75950bSTrond Myklebust else { 13961c75950bSTrond Myklebust idx_start = wbc->range_start >> PAGE_CACHE_SHIFT; 13971c75950bSTrond Myklebust idx_end = wbc->range_end >> PAGE_CACHE_SHIFT; 13981c75950bSTrond Myklebust if (idx_end > idx_start) { 13991c75950bSTrond Myklebust unsigned long l_npages = 1 + idx_end - idx_start; 14001c75950bSTrond Myklebust npages = l_npages; 14011c75950bSTrond Myklebust if (sizeof(npages) != sizeof(l_npages) && 14021c75950bSTrond Myklebust (unsigned long)npages != l_npages) 14031c75950bSTrond Myklebust npages = 0; 14041c75950bSTrond Myklebust } 14051c75950bSTrond Myklebust } 1406c42de9ddSTrond Myklebust how &= ~FLUSH_NOCOMMIT; 1407c42de9ddSTrond Myklebust spin_lock(&nfsi->req_lock); 14081da177e4SLinus Torvalds do { 14091c75950bSTrond Myklebust wbc->pages_skipped = 0; 1410c42de9ddSTrond Myklebust ret = nfs_wait_on_requests_locked(inode, idx_start, npages); 1411c42de9ddSTrond Myklebust if (ret != 0) 1412c42de9ddSTrond Myklebust continue; 14131c75950bSTrond Myklebust pages = nfs_scan_dirty(mapping, wbc, &head); 1414c42de9ddSTrond Myklebust if (pages != 0) { 1415c42de9ddSTrond Myklebust spin_unlock(&nfsi->req_lock); 1416e8e058e8STrond Myklebust if (how & FLUSH_INVALIDATE) { 141783715ad5STrond Myklebust nfs_cancel_dirty_list(&head); 1418e8e058e8STrond Myklebust ret = pages; 1419e8e058e8STrond Myklebust } else 1420c42de9ddSTrond Myklebust ret = nfs_flush_list(inode, &head, pages, how); 1421c42de9ddSTrond Myklebust spin_lock(&nfsi->req_lock); 142270b9ecbdSTrond Myklebust continue; 142370b9ecbdSTrond Myklebust } 14241c75950bSTrond Myklebust if (wbc->pages_skipped != 0) 14251c75950bSTrond Myklebust continue; 1426c42de9ddSTrond Myklebust if (nocommit) 1427c42de9ddSTrond Myklebust break; 1428d2ccddf0STrond Myklebust pages = nfs_scan_commit(inode, &head, idx_start, npages); 14291c75950bSTrond Myklebust if (pages == 0) { 14301c75950bSTrond Myklebust if (wbc->pages_skipped != 0) 14311c75950bSTrond Myklebust continue; 1432c42de9ddSTrond Myklebust break; 14331c75950bSTrond Myklebust } 1434d2ccddf0STrond Myklebust if (how & FLUSH_INVALIDATE) { 1435d2ccddf0STrond Myklebust spin_unlock(&nfsi->req_lock); 143683715ad5STrond Myklebust nfs_cancel_commit_list(&head); 1437e8e058e8STrond Myklebust ret = pages; 1438d2ccddf0STrond Myklebust spin_lock(&nfsi->req_lock); 1439d2ccddf0STrond Myklebust continue; 1440d2ccddf0STrond Myklebust } 1441d2ccddf0STrond Myklebust pages += nfs_scan_commit(inode, &head, 0, 0); 1442c42de9ddSTrond Myklebust spin_unlock(&nfsi->req_lock); 1443c42de9ddSTrond Myklebust ret = nfs_commit_list(inode, &head, how); 1444c42de9ddSTrond Myklebust spin_lock(&nfsi->req_lock); 1445c42de9ddSTrond Myklebust } while (ret >= 0); 1446c42de9ddSTrond Myklebust spin_unlock(&nfsi->req_lock); 1447c42de9ddSTrond Myklebust return ret; 14481da177e4SLinus Torvalds } 14491da177e4SLinus Torvalds 14501c75950bSTrond Myklebust /* 14511c75950bSTrond Myklebust * flush the inode to disk. 14521c75950bSTrond Myklebust */ 14531c75950bSTrond Myklebust int nfs_wb_all(struct inode *inode) 14541c75950bSTrond Myklebust { 14551c75950bSTrond Myklebust struct address_space *mapping = inode->i_mapping; 14561c75950bSTrond Myklebust struct writeback_control wbc = { 14571c75950bSTrond Myklebust .bdi = mapping->backing_dev_info, 14581c75950bSTrond Myklebust .sync_mode = WB_SYNC_ALL, 14591c75950bSTrond Myklebust .nr_to_write = LONG_MAX, 146061822ab5STrond Myklebust .for_writepages = 1, 14611c75950bSTrond Myklebust .range_cyclic = 1, 14621c75950bSTrond Myklebust }; 14631c75950bSTrond Myklebust int ret; 14641c75950bSTrond Myklebust 146561822ab5STrond Myklebust ret = generic_writepages(mapping, &wbc); 146661822ab5STrond Myklebust if (ret < 0) 146761822ab5STrond Myklebust goto out; 14681c75950bSTrond Myklebust ret = nfs_sync_mapping_wait(mapping, &wbc, 0); 14691c75950bSTrond Myklebust if (ret >= 0) 14701c75950bSTrond Myklebust return 0; 147161822ab5STrond Myklebust out: 1472*e507d9ebSTrond Myklebust __mark_inode_dirty(mapping->host, I_DIRTY_PAGES); 14731c75950bSTrond Myklebust return ret; 14741c75950bSTrond Myklebust } 14751c75950bSTrond Myklebust 14761c75950bSTrond Myklebust int nfs_sync_mapping_range(struct address_space *mapping, loff_t range_start, loff_t range_end, int how) 14771c75950bSTrond Myklebust { 14781c75950bSTrond Myklebust struct writeback_control wbc = { 14791c75950bSTrond Myklebust .bdi = mapping->backing_dev_info, 14801c75950bSTrond Myklebust .sync_mode = WB_SYNC_ALL, 14811c75950bSTrond Myklebust .nr_to_write = LONG_MAX, 14821c75950bSTrond Myklebust .range_start = range_start, 14831c75950bSTrond Myklebust .range_end = range_end, 148461822ab5STrond Myklebust .for_writepages = 1, 14851c75950bSTrond Myklebust }; 14861c75950bSTrond Myklebust int ret; 14871c75950bSTrond Myklebust 148861822ab5STrond Myklebust if (!(how & FLUSH_NOWRITEPAGE)) { 148961822ab5STrond Myklebust ret = generic_writepages(mapping, &wbc); 149061822ab5STrond Myklebust if (ret < 0) 149161822ab5STrond Myklebust goto out; 149261822ab5STrond Myklebust } 14931c75950bSTrond Myklebust ret = nfs_sync_mapping_wait(mapping, &wbc, how); 14941c75950bSTrond Myklebust if (ret >= 0) 14951c75950bSTrond Myklebust return 0; 149661822ab5STrond Myklebust out: 1497*e507d9ebSTrond Myklebust __mark_inode_dirty(mapping->host, I_DIRTY_PAGES); 14981c75950bSTrond Myklebust return ret; 14991c75950bSTrond Myklebust } 15001c75950bSTrond Myklebust 150161822ab5STrond Myklebust int nfs_wb_page_priority(struct inode *inode, struct page *page, int how) 15021c75950bSTrond Myklebust { 15031c75950bSTrond Myklebust loff_t range_start = page_offset(page); 15041c75950bSTrond Myklebust loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); 15054d770ccfSTrond Myklebust struct writeback_control wbc = { 15064d770ccfSTrond Myklebust .bdi = page->mapping->backing_dev_info, 15074d770ccfSTrond Myklebust .sync_mode = WB_SYNC_ALL, 15084d770ccfSTrond Myklebust .nr_to_write = LONG_MAX, 15094d770ccfSTrond Myklebust .range_start = range_start, 15104d770ccfSTrond Myklebust .range_end = range_end, 15114d770ccfSTrond Myklebust }; 15124d770ccfSTrond Myklebust int ret; 15131c75950bSTrond Myklebust 15144d770ccfSTrond Myklebust BUG_ON(!PageLocked(page)); 15154d770ccfSTrond Myklebust if (!(how & FLUSH_NOWRITEPAGE) && clear_page_dirty_for_io(page)) { 15164d770ccfSTrond Myklebust ret = nfs_writepage_locked(page, &wbc); 15174d770ccfSTrond Myklebust if (ret < 0) 15184d770ccfSTrond Myklebust goto out; 15194d770ccfSTrond Myklebust } 15204d770ccfSTrond Myklebust ret = nfs_sync_mapping_wait(page->mapping, &wbc, how); 15214d770ccfSTrond Myklebust if (ret >= 0) 15224d770ccfSTrond Myklebust return 0; 15234d770ccfSTrond Myklebust out: 1524*e507d9ebSTrond Myklebust __mark_inode_dirty(inode, I_DIRTY_PAGES); 15254d770ccfSTrond Myklebust return ret; 15261c75950bSTrond Myklebust } 15271c75950bSTrond Myklebust 15281c75950bSTrond Myklebust /* 15291c75950bSTrond Myklebust * Write back all requests on one page - we do this before reading it. 15301c75950bSTrond Myklebust */ 15311c75950bSTrond Myklebust int nfs_wb_page(struct inode *inode, struct page* page) 15321c75950bSTrond Myklebust { 15334d770ccfSTrond Myklebust return nfs_wb_page_priority(inode, page, FLUSH_STABLE); 15341c75950bSTrond Myklebust } 15351c75950bSTrond Myklebust 15361a54533eSTrond Myklebust int nfs_set_page_dirty(struct page *page) 15371a54533eSTrond Myklebust { 15381a54533eSTrond Myklebust struct nfs_page *req; 15391a54533eSTrond Myklebust 15401a54533eSTrond Myklebust req = nfs_page_find_request(page); 15411a54533eSTrond Myklebust if (req != NULL) { 15421a54533eSTrond Myklebust /* Mark any existing write requests for flushing */ 15431a54533eSTrond Myklebust set_bit(PG_NEED_FLUSH, &req->wb_flags); 15441a54533eSTrond Myklebust nfs_release_request(req); 15451a54533eSTrond Myklebust } 15461a54533eSTrond Myklebust return __set_page_dirty_nobuffers(page); 15471a54533eSTrond Myklebust } 15481a54533eSTrond Myklebust 15491c75950bSTrond Myklebust 1550f7b422b1SDavid Howells int __init nfs_init_writepagecache(void) 15511da177e4SLinus Torvalds { 15521da177e4SLinus Torvalds nfs_wdata_cachep = kmem_cache_create("nfs_write_data", 15531da177e4SLinus Torvalds sizeof(struct nfs_write_data), 15541da177e4SLinus Torvalds 0, SLAB_HWCACHE_ALIGN, 15551da177e4SLinus Torvalds NULL, NULL); 15561da177e4SLinus Torvalds if (nfs_wdata_cachep == NULL) 15571da177e4SLinus Torvalds return -ENOMEM; 15581da177e4SLinus Torvalds 155993d2341cSMatthew Dobson nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE, 15601da177e4SLinus Torvalds nfs_wdata_cachep); 15611da177e4SLinus Torvalds if (nfs_wdata_mempool == NULL) 15621da177e4SLinus Torvalds return -ENOMEM; 15631da177e4SLinus Torvalds 156493d2341cSMatthew Dobson nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT, 15651da177e4SLinus Torvalds nfs_wdata_cachep); 15661da177e4SLinus Torvalds if (nfs_commit_mempool == NULL) 15671da177e4SLinus Torvalds return -ENOMEM; 15681da177e4SLinus Torvalds 15691da177e4SLinus Torvalds return 0; 15701da177e4SLinus Torvalds } 15711da177e4SLinus Torvalds 1572266bee88SDavid Brownell void nfs_destroy_writepagecache(void) 15731da177e4SLinus Torvalds { 15741da177e4SLinus Torvalds mempool_destroy(nfs_commit_mempool); 15751da177e4SLinus Torvalds mempool_destroy(nfs_wdata_mempool); 15761a1d92c1SAlexey Dobriyan kmem_cache_destroy(nfs_wdata_cachep); 15771da177e4SLinus Torvalds } 15781da177e4SLinus Torvalds 1579