131143d5dSDavid Howells /* handling of writes to regular files and writing back to the server 231143d5dSDavid Howells * 331143d5dSDavid Howells * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. 431143d5dSDavid Howells * Written by David Howells (dhowells@redhat.com) 531143d5dSDavid Howells * 631143d5dSDavid Howells * This program is free software; you can redistribute it and/or 731143d5dSDavid Howells * modify it under the terms of the GNU General Public License 831143d5dSDavid Howells * as published by the Free Software Foundation; either version 931143d5dSDavid Howells * 2 of the License, or (at your option) any later version. 1031143d5dSDavid Howells */ 114343d008SDavid Howells 124af3c9ccSAlexey Dobriyan #include <linux/backing-dev.h> 1331143d5dSDavid Howells #include <linux/slab.h> 1431143d5dSDavid Howells #include <linux/fs.h> 1531143d5dSDavid Howells #include <linux/pagemap.h> 1631143d5dSDavid Howells #include <linux/writeback.h> 1731143d5dSDavid Howells #include <linux/pagevec.h> 1831143d5dSDavid Howells #include "internal.h" 1931143d5dSDavid Howells 2031143d5dSDavid Howells /* 2131143d5dSDavid Howells * mark a page as having been made dirty and thus needing writeback 2231143d5dSDavid Howells */ 2331143d5dSDavid Howells int afs_set_page_dirty(struct page *page) 2431143d5dSDavid Howells { 2531143d5dSDavid Howells _enter(""); 2631143d5dSDavid Howells return __set_page_dirty_nobuffers(page); 2731143d5dSDavid Howells } 2831143d5dSDavid Howells 2931143d5dSDavid Howells /* 3031143d5dSDavid Howells * partly or wholly fill a page that's under preparation for writing 3131143d5dSDavid Howells */ 3231143d5dSDavid Howells static int afs_fill_page(struct afs_vnode *vnode, struct key *key, 33e8e581a8SDavid Howells loff_t pos, unsigned int len, struct page *page) 3431143d5dSDavid Howells { 35196ee9cdSDavid Howells struct afs_read *req; 3631143d5dSDavid Howells int ret; 3731143d5dSDavid Howells 385e7f2337SAnton Blanchard _enter(",,%llu", (unsigned long long)pos); 3931143d5dSDavid Howells 40196ee9cdSDavid Howells req = kzalloc(sizeof(struct afs_read) + sizeof(struct page *), 41196ee9cdSDavid Howells GFP_KERNEL); 42196ee9cdSDavid Howells if (!req) 43196ee9cdSDavid Howells return -ENOMEM; 44196ee9cdSDavid Howells 45196ee9cdSDavid Howells atomic_set(&req->usage, 1); 46196ee9cdSDavid Howells req->pos = pos; 47e8e581a8SDavid Howells req->len = len; 48196ee9cdSDavid Howells req->nr_pages = 1; 49196ee9cdSDavid Howells req->pages[0] = page; 505611ef28SDavid Howells get_page(page); 51196ee9cdSDavid Howells 52d2ddc776SDavid Howells ret = afs_fetch_data(vnode, key, req); 53196ee9cdSDavid Howells afs_put_read(req); 5431143d5dSDavid Howells if (ret < 0) { 5531143d5dSDavid Howells if (ret == -ENOENT) { 5631143d5dSDavid Howells _debug("got NOENT from server" 5731143d5dSDavid Howells " - marking file deleted and stale"); 5831143d5dSDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 5931143d5dSDavid Howells ret = -ESTALE; 6031143d5dSDavid Howells } 6131143d5dSDavid Howells } 6231143d5dSDavid Howells 6331143d5dSDavid Howells _leave(" = %d", ret); 6431143d5dSDavid Howells return ret; 6531143d5dSDavid Howells } 6631143d5dSDavid Howells 6731143d5dSDavid Howells /* 6831143d5dSDavid Howells * prepare to perform part of a write to a page 6931143d5dSDavid Howells */ 7015b4650eSNick Piggin int afs_write_begin(struct file *file, struct address_space *mapping, 7115b4650eSNick Piggin loff_t pos, unsigned len, unsigned flags, 7215b4650eSNick Piggin struct page **pagep, void **fsdata) 7331143d5dSDavid Howells { 74496ad9aaSAl Viro struct afs_vnode *vnode = AFS_FS_I(file_inode(file)); 7515b4650eSNick Piggin struct page *page; 76215804a9SDavid Howells struct key *key = afs_file_key(file); 774343d008SDavid Howells unsigned long priv; 784343d008SDavid Howells unsigned f, from = pos & (PAGE_SIZE - 1); 794343d008SDavid Howells unsigned t, to = from + len; 8009cbfeafSKirill A. Shutemov pgoff_t index = pos >> PAGE_SHIFT; 8131143d5dSDavid Howells int ret; 8231143d5dSDavid Howells 8331143d5dSDavid Howells _enter("{%x:%u},{%lx},%u,%u", 8415b4650eSNick Piggin vnode->fid.vid, vnode->fid.vnode, index, from, to); 8531143d5dSDavid Howells 864343d008SDavid Howells /* We want to store information about how much of a page is altered in 874343d008SDavid Howells * page->private. 884343d008SDavid Howells */ 894343d008SDavid Howells BUILD_BUG_ON(PAGE_SIZE > 32768 && sizeof(page->private) < 8); 9031143d5dSDavid Howells 9154566b2cSNick Piggin page = grab_cache_page_write_begin(mapping, index, flags); 924343d008SDavid Howells if (!page) 9315b4650eSNick Piggin return -ENOMEM; 9415b4650eSNick Piggin 9509cbfeafSKirill A. Shutemov if (!PageUptodate(page) && len != PAGE_SIZE) { 96e8e581a8SDavid Howells ret = afs_fill_page(vnode, key, pos & PAGE_MASK, PAGE_SIZE, page); 9731143d5dSDavid Howells if (ret < 0) { 986d06b0d2SDavid Howells unlock_page(page); 996d06b0d2SDavid Howells put_page(page); 10031143d5dSDavid Howells _leave(" = %d [prep]", ret); 10131143d5dSDavid Howells return ret; 10231143d5dSDavid Howells } 10315b4650eSNick Piggin SetPageUptodate(page); 10431143d5dSDavid Howells } 10531143d5dSDavid Howells 1066d06b0d2SDavid Howells /* page won't leak in error case: it eventually gets cleaned off LRU */ 1076d06b0d2SDavid Howells *pagep = page; 1086d06b0d2SDavid Howells 10931143d5dSDavid Howells try_again: 1104343d008SDavid Howells /* See if this page is already partially written in a way that we can 1114343d008SDavid Howells * merge the new write with. 1124343d008SDavid Howells */ 1134343d008SDavid Howells t = f = 0; 1144343d008SDavid Howells if (PagePrivate(page)) { 1154343d008SDavid Howells priv = page_private(page); 1164343d008SDavid Howells f = priv & AFS_PRIV_MAX; 1174343d008SDavid Howells t = priv >> AFS_PRIV_SHIFT; 1184343d008SDavid Howells ASSERTCMP(f, <=, t); 11931143d5dSDavid Howells } 12031143d5dSDavid Howells 1214343d008SDavid Howells if (f != t) { 1224343d008SDavid Howells if (to < f || from > t) 1234343d008SDavid Howells goto flush_conflicting_write; 1244343d008SDavid Howells if (from < f) 1254343d008SDavid Howells f = from; 1264343d008SDavid Howells if (to > t) 1274343d008SDavid Howells t = to; 1284343d008SDavid Howells } else { 1294343d008SDavid Howells f = from; 1304343d008SDavid Howells t = to; 13131143d5dSDavid Howells } 13231143d5dSDavid Howells 1334343d008SDavid Howells priv = (unsigned long)t << AFS_PRIV_SHIFT; 1344343d008SDavid Howells priv |= f; 13513524ab3SDavid Howells trace_afs_page_dirty(vnode, tracepoint_string("begin"), 13613524ab3SDavid Howells page->index, priv); 13731143d5dSDavid Howells SetPagePrivate(page); 1384343d008SDavid Howells set_page_private(page, priv); 1394343d008SDavid Howells _leave(" = 0"); 14031143d5dSDavid Howells return 0; 14131143d5dSDavid Howells 1424343d008SDavid Howells /* The previous write and this write aren't adjacent or overlapping, so 1434343d008SDavid Howells * flush the page out. 1444343d008SDavid Howells */ 1454343d008SDavid Howells flush_conflicting_write: 14631143d5dSDavid Howells _debug("flush conflict"); 1474343d008SDavid Howells ret = write_one_page(page); 14831143d5dSDavid Howells if (ret < 0) { 14931143d5dSDavid Howells _leave(" = %d", ret); 15031143d5dSDavid Howells return ret; 15131143d5dSDavid Howells } 15231143d5dSDavid Howells 1534343d008SDavid Howells ret = lock_page_killable(page); 1544343d008SDavid Howells if (ret < 0) { 1554343d008SDavid Howells _leave(" = %d", ret); 1564343d008SDavid Howells return ret; 1574343d008SDavid Howells } 15831143d5dSDavid Howells goto try_again; 15931143d5dSDavid Howells } 16031143d5dSDavid Howells 16131143d5dSDavid Howells /* 16231143d5dSDavid Howells * finalise part of a write to a page 16331143d5dSDavid Howells */ 16415b4650eSNick Piggin int afs_write_end(struct file *file, struct address_space *mapping, 16515b4650eSNick Piggin loff_t pos, unsigned len, unsigned copied, 16615b4650eSNick Piggin struct page *page, void *fsdata) 16731143d5dSDavid Howells { 168496ad9aaSAl Viro struct afs_vnode *vnode = AFS_FS_I(file_inode(file)); 169215804a9SDavid Howells struct key *key = afs_file_key(file); 17031143d5dSDavid Howells loff_t i_size, maybe_i_size; 171e8e581a8SDavid Howells int ret; 17231143d5dSDavid Howells 17315b4650eSNick Piggin _enter("{%x:%u},{%lx}", 17415b4650eSNick Piggin vnode->fid.vid, vnode->fid.vnode, page->index); 17531143d5dSDavid Howells 17615b4650eSNick Piggin maybe_i_size = pos + copied; 17731143d5dSDavid Howells 17831143d5dSDavid Howells i_size = i_size_read(&vnode->vfs_inode); 17931143d5dSDavid Howells if (maybe_i_size > i_size) { 1804343d008SDavid Howells spin_lock(&vnode->wb_lock); 18131143d5dSDavid Howells i_size = i_size_read(&vnode->vfs_inode); 18231143d5dSDavid Howells if (maybe_i_size > i_size) 18331143d5dSDavid Howells i_size_write(&vnode->vfs_inode, maybe_i_size); 1844343d008SDavid Howells spin_unlock(&vnode->wb_lock); 18531143d5dSDavid Howells } 18631143d5dSDavid Howells 187e8e581a8SDavid Howells if (!PageUptodate(page)) { 188e8e581a8SDavid Howells if (copied < len) { 189e8e581a8SDavid Howells /* Try and load any missing data from the server. The 190e8e581a8SDavid Howells * unmarshalling routine will take care of clearing any 191e8e581a8SDavid Howells * bits that are beyond the EOF. 192e8e581a8SDavid Howells */ 193e8e581a8SDavid Howells ret = afs_fill_page(vnode, key, pos + copied, 194e8e581a8SDavid Howells len - copied, page); 195e8e581a8SDavid Howells if (ret < 0) 196e8e581a8SDavid Howells return ret; 197e8e581a8SDavid Howells } 198e8e581a8SDavid Howells SetPageUptodate(page); 199e8e581a8SDavid Howells } 200e8e581a8SDavid Howells 20131143d5dSDavid Howells set_page_dirty(page); 20231143d5dSDavid Howells if (PageDirty(page)) 20331143d5dSDavid Howells _debug("dirtied"); 20415b4650eSNick Piggin unlock_page(page); 20509cbfeafSKirill A. Shutemov put_page(page); 20631143d5dSDavid Howells 20715b4650eSNick Piggin return copied; 20831143d5dSDavid Howells } 20931143d5dSDavid Howells 21031143d5dSDavid Howells /* 21131143d5dSDavid Howells * kill all the pages in the given range 21231143d5dSDavid Howells */ 2134343d008SDavid Howells static void afs_kill_pages(struct address_space *mapping, 21431143d5dSDavid Howells pgoff_t first, pgoff_t last) 21531143d5dSDavid Howells { 2164343d008SDavid Howells struct afs_vnode *vnode = AFS_FS_I(mapping->host); 21731143d5dSDavid Howells struct pagevec pv; 21831143d5dSDavid Howells unsigned count, loop; 21931143d5dSDavid Howells 22031143d5dSDavid Howells _enter("{%x:%u},%lx-%lx", 22131143d5dSDavid Howells vnode->fid.vid, vnode->fid.vnode, first, last); 22231143d5dSDavid Howells 22386679820SMel Gorman pagevec_init(&pv); 22431143d5dSDavid Howells 22531143d5dSDavid Howells do { 22631143d5dSDavid Howells _debug("kill %lx-%lx", first, last); 22731143d5dSDavid Howells 22831143d5dSDavid Howells count = last - first + 1; 22931143d5dSDavid Howells if (count > PAGEVEC_SIZE) 23031143d5dSDavid Howells count = PAGEVEC_SIZE; 2314343d008SDavid Howells pv.nr = find_get_pages_contig(mapping, first, count, pv.pages); 23231143d5dSDavid Howells ASSERTCMP(pv.nr, ==, count); 23331143d5dSDavid Howells 23431143d5dSDavid Howells for (loop = 0; loop < count; loop++) { 2357286a35eSDavid Howells struct page *page = pv.pages[loop]; 2367286a35eSDavid Howells ClearPageUptodate(page); 2377286a35eSDavid Howells SetPageError(page); 2384343d008SDavid Howells end_page_writeback(page); 2394343d008SDavid Howells if (page->index >= first) 2404343d008SDavid Howells first = page->index + 1; 2414343d008SDavid Howells lock_page(page); 2424343d008SDavid Howells generic_error_remove_page(mapping, page); 2434343d008SDavid Howells } 2444343d008SDavid Howells 2454343d008SDavid Howells __pagevec_release(&pv); 2464343d008SDavid Howells } while (first <= last); 2474343d008SDavid Howells 2484343d008SDavid Howells _leave(""); 2494343d008SDavid Howells } 2504343d008SDavid Howells 2514343d008SDavid Howells /* 2524343d008SDavid Howells * Redirty all the pages in a given range. 2534343d008SDavid Howells */ 2544343d008SDavid Howells static void afs_redirty_pages(struct writeback_control *wbc, 2554343d008SDavid Howells struct address_space *mapping, 2564343d008SDavid Howells pgoff_t first, pgoff_t last) 2574343d008SDavid Howells { 2584343d008SDavid Howells struct afs_vnode *vnode = AFS_FS_I(mapping->host); 2594343d008SDavid Howells struct pagevec pv; 2604343d008SDavid Howells unsigned count, loop; 2614343d008SDavid Howells 2624343d008SDavid Howells _enter("{%x:%u},%lx-%lx", 2634343d008SDavid Howells vnode->fid.vid, vnode->fid.vnode, first, last); 2644343d008SDavid Howells 265487e2c9fSLinus Torvalds pagevec_init(&pv); 2664343d008SDavid Howells 2674343d008SDavid Howells do { 2684343d008SDavid Howells _debug("redirty %lx-%lx", first, last); 2694343d008SDavid Howells 2704343d008SDavid Howells count = last - first + 1; 2714343d008SDavid Howells if (count > PAGEVEC_SIZE) 2724343d008SDavid Howells count = PAGEVEC_SIZE; 2734343d008SDavid Howells pv.nr = find_get_pages_contig(mapping, first, count, pv.pages); 2744343d008SDavid Howells ASSERTCMP(pv.nr, ==, count); 2754343d008SDavid Howells 2764343d008SDavid Howells for (loop = 0; loop < count; loop++) { 2774343d008SDavid Howells struct page *page = pv.pages[loop]; 2784343d008SDavid Howells 2794343d008SDavid Howells redirty_page_for_writepage(wbc, page); 2807286a35eSDavid Howells end_page_writeback(page); 2817286a35eSDavid Howells if (page->index >= first) 2827286a35eSDavid Howells first = page->index + 1; 28331143d5dSDavid Howells } 28431143d5dSDavid Howells 28531143d5dSDavid Howells __pagevec_release(&pv); 2864343d008SDavid Howells } while (first <= last); 28731143d5dSDavid Howells 28831143d5dSDavid Howells _leave(""); 28931143d5dSDavid Howells } 29031143d5dSDavid Howells 29131143d5dSDavid Howells /* 292d2ddc776SDavid Howells * write to a file 29331143d5dSDavid Howells */ 2944343d008SDavid Howells static int afs_store_data(struct address_space *mapping, 2954343d008SDavid Howells pgoff_t first, pgoff_t last, 296d2ddc776SDavid Howells unsigned offset, unsigned to) 29731143d5dSDavid Howells { 2984343d008SDavid Howells struct afs_vnode *vnode = AFS_FS_I(mapping->host); 299d2ddc776SDavid Howells struct afs_fs_cursor fc; 3004343d008SDavid Howells struct afs_wb_key *wbk = NULL; 3014343d008SDavid Howells struct list_head *p; 3024343d008SDavid Howells int ret = -ENOKEY, ret2; 303d2ddc776SDavid Howells 3044343d008SDavid Howells _enter("%s{%x:%u.%u},%lx,%lx,%x,%x", 305d2ddc776SDavid Howells vnode->volume->name, 306d2ddc776SDavid Howells vnode->fid.vid, 307d2ddc776SDavid Howells vnode->fid.vnode, 308d2ddc776SDavid Howells vnode->fid.unique, 309d2ddc776SDavid Howells first, last, offset, to); 310d2ddc776SDavid Howells 3114343d008SDavid Howells spin_lock(&vnode->wb_lock); 3124343d008SDavid Howells p = vnode->wb_keys.next; 3134343d008SDavid Howells 3144343d008SDavid Howells /* Iterate through the list looking for a valid key to use. */ 3154343d008SDavid Howells try_next_key: 3164343d008SDavid Howells while (p != &vnode->wb_keys) { 3174343d008SDavid Howells wbk = list_entry(p, struct afs_wb_key, vnode_link); 3184343d008SDavid Howells _debug("wbk %u", key_serial(wbk->key)); 3194343d008SDavid Howells ret2 = key_validate(wbk->key); 3204343d008SDavid Howells if (ret2 == 0) 3214343d008SDavid Howells goto found_key; 3224343d008SDavid Howells if (ret == -ENOKEY) 3234343d008SDavid Howells ret = ret2; 3244343d008SDavid Howells p = p->next; 3254343d008SDavid Howells } 3264343d008SDavid Howells 3274343d008SDavid Howells spin_unlock(&vnode->wb_lock); 3284343d008SDavid Howells afs_put_wb_key(wbk); 3294343d008SDavid Howells _leave(" = %d [no keys]", ret); 3304343d008SDavid Howells return ret; 3314343d008SDavid Howells 3324343d008SDavid Howells found_key: 3334343d008SDavid Howells refcount_inc(&wbk->usage); 3344343d008SDavid Howells spin_unlock(&vnode->wb_lock); 3354343d008SDavid Howells 3364343d008SDavid Howells _debug("USE WB KEY %u", key_serial(wbk->key)); 3374343d008SDavid Howells 338d2ddc776SDavid Howells ret = -ERESTARTSYS; 3394343d008SDavid Howells if (afs_begin_vnode_operation(&fc, vnode, wbk->key)) { 340d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 341d2ddc776SDavid Howells fc.cb_break = vnode->cb_break + vnode->cb_s_break; 3424343d008SDavid Howells afs_fs_store_data(&fc, mapping, first, last, offset, to); 343d2ddc776SDavid Howells } 344d2ddc776SDavid Howells 345d2ddc776SDavid Howells afs_check_for_remote_deletion(&fc, fc.vnode); 346d2ddc776SDavid Howells afs_vnode_commit_status(&fc, vnode, fc.cb_break); 347d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 348d2ddc776SDavid Howells } 349d2ddc776SDavid Howells 3504343d008SDavid Howells switch (ret) { 3514343d008SDavid Howells case -EACCES: 3524343d008SDavid Howells case -EPERM: 3534343d008SDavid Howells case -ENOKEY: 3544343d008SDavid Howells case -EKEYEXPIRED: 3554343d008SDavid Howells case -EKEYREJECTED: 3564343d008SDavid Howells case -EKEYREVOKED: 3574343d008SDavid Howells _debug("next"); 3584343d008SDavid Howells spin_lock(&vnode->wb_lock); 3594343d008SDavid Howells p = wbk->vnode_link.next; 3604343d008SDavid Howells afs_put_wb_key(wbk); 3614343d008SDavid Howells goto try_next_key; 3624343d008SDavid Howells } 3634343d008SDavid Howells 3644343d008SDavid Howells afs_put_wb_key(wbk); 365d2ddc776SDavid Howells _leave(" = %d", ret); 366d2ddc776SDavid Howells return ret; 367d2ddc776SDavid Howells } 368d2ddc776SDavid Howells 369d2ddc776SDavid Howells /* 3704343d008SDavid Howells * Synchronously write back the locked page and any subsequent non-locked dirty 3714343d008SDavid Howells * pages. 37231143d5dSDavid Howells */ 3734343d008SDavid Howells static int afs_write_back_from_locked_page(struct address_space *mapping, 3744343d008SDavid Howells struct writeback_control *wbc, 3754343d008SDavid Howells struct page *primary_page, 3764343d008SDavid Howells pgoff_t final_page) 37731143d5dSDavid Howells { 37813524ab3SDavid Howells struct afs_vnode *vnode = AFS_FS_I(mapping->host); 37931143d5dSDavid Howells struct page *pages[8], *page; 3804343d008SDavid Howells unsigned long count, priv; 3814343d008SDavid Howells unsigned n, offset, to, f, t; 38231143d5dSDavid Howells pgoff_t start, first, last; 38331143d5dSDavid Howells int loop, ret; 38431143d5dSDavid Howells 38531143d5dSDavid Howells _enter(",%lx", primary_page->index); 38631143d5dSDavid Howells 38731143d5dSDavid Howells count = 1; 38831143d5dSDavid Howells if (test_set_page_writeback(primary_page)) 38931143d5dSDavid Howells BUG(); 39031143d5dSDavid Howells 3914343d008SDavid Howells /* Find all consecutive lockable dirty pages that have contiguous 3924343d008SDavid Howells * written regions, stopping when we find a page that is not 3934343d008SDavid Howells * immediately lockable, is not dirty or is missing, or we reach the 3944343d008SDavid Howells * end of the range. 3954343d008SDavid Howells */ 39631143d5dSDavid Howells start = primary_page->index; 3974343d008SDavid Howells priv = page_private(primary_page); 3984343d008SDavid Howells offset = priv & AFS_PRIV_MAX; 3994343d008SDavid Howells to = priv >> AFS_PRIV_SHIFT; 40013524ab3SDavid Howells trace_afs_page_dirty(vnode, tracepoint_string("store"), 40113524ab3SDavid Howells primary_page->index, priv); 4024343d008SDavid Howells 4034343d008SDavid Howells WARN_ON(offset == to); 40413524ab3SDavid Howells if (offset == to) 40513524ab3SDavid Howells trace_afs_page_dirty(vnode, tracepoint_string("WARN"), 40613524ab3SDavid Howells primary_page->index, priv); 4074343d008SDavid Howells 4084343d008SDavid Howells if (start >= final_page || to < PAGE_SIZE) 40931143d5dSDavid Howells goto no_more; 4104343d008SDavid Howells 41131143d5dSDavid Howells start++; 41231143d5dSDavid Howells do { 41331143d5dSDavid Howells _debug("more %lx [%lx]", start, count); 4144343d008SDavid Howells n = final_page - start + 1; 41531143d5dSDavid Howells if (n > ARRAY_SIZE(pages)) 41631143d5dSDavid Howells n = ARRAY_SIZE(pages); 4174343d008SDavid Howells n = find_get_pages_contig(mapping, start, ARRAY_SIZE(pages), pages); 41831143d5dSDavid Howells _debug("fgpc %u", n); 41931143d5dSDavid Howells if (n == 0) 42031143d5dSDavid Howells goto no_more; 42131143d5dSDavid Howells if (pages[0]->index != start) { 4229d577b6aSDavid Howells do { 4239d577b6aSDavid Howells put_page(pages[--n]); 4249d577b6aSDavid Howells } while (n > 0); 42531143d5dSDavid Howells goto no_more; 42631143d5dSDavid Howells } 42731143d5dSDavid Howells 42831143d5dSDavid Howells for (loop = 0; loop < n; loop++) { 4294343d008SDavid Howells if (to != PAGE_SIZE) 4304343d008SDavid Howells break; 43131143d5dSDavid Howells page = pages[loop]; 4324343d008SDavid Howells if (page->index > final_page) 43331143d5dSDavid Howells break; 434529ae9aaSNick Piggin if (!trylock_page(page)) 43531143d5dSDavid Howells break; 4364343d008SDavid Howells if (!PageDirty(page) || PageWriteback(page)) { 43731143d5dSDavid Howells unlock_page(page); 43831143d5dSDavid Howells break; 43931143d5dSDavid Howells } 4404343d008SDavid Howells 4414343d008SDavid Howells priv = page_private(page); 4424343d008SDavid Howells f = priv & AFS_PRIV_MAX; 4434343d008SDavid Howells t = priv >> AFS_PRIV_SHIFT; 4444343d008SDavid Howells if (f != 0) { 4454343d008SDavid Howells unlock_page(page); 4464343d008SDavid Howells break; 4474343d008SDavid Howells } 4484343d008SDavid Howells to = t; 4494343d008SDavid Howells 45013524ab3SDavid Howells trace_afs_page_dirty(vnode, tracepoint_string("store+"), 45113524ab3SDavid Howells page->index, priv); 45213524ab3SDavid Howells 45331143d5dSDavid Howells if (!clear_page_dirty_for_io(page)) 45431143d5dSDavid Howells BUG(); 45531143d5dSDavid Howells if (test_set_page_writeback(page)) 45631143d5dSDavid Howells BUG(); 45731143d5dSDavid Howells unlock_page(page); 45831143d5dSDavid Howells put_page(page); 45931143d5dSDavid Howells } 46031143d5dSDavid Howells count += loop; 46131143d5dSDavid Howells if (loop < n) { 46231143d5dSDavid Howells for (; loop < n; loop++) 46331143d5dSDavid Howells put_page(pages[loop]); 46431143d5dSDavid Howells goto no_more; 46531143d5dSDavid Howells } 46631143d5dSDavid Howells 46731143d5dSDavid Howells start += loop; 4684343d008SDavid Howells } while (start <= final_page && count < 65536); 46931143d5dSDavid Howells 47031143d5dSDavid Howells no_more: 4714343d008SDavid Howells /* We now have a contiguous set of dirty pages, each with writeback 4724343d008SDavid Howells * set; the first page is still locked at this point, but all the rest 4734343d008SDavid Howells * have been unlocked. 4744343d008SDavid Howells */ 4754343d008SDavid Howells unlock_page(primary_page); 4764343d008SDavid Howells 47731143d5dSDavid Howells first = primary_page->index; 47831143d5dSDavid Howells last = first + count - 1; 47931143d5dSDavid Howells 48031143d5dSDavid Howells _debug("write back %lx[%u..] to %lx[..%u]", first, offset, last, to); 48131143d5dSDavid Howells 4824343d008SDavid Howells ret = afs_store_data(mapping, first, last, offset, to); 48331143d5dSDavid Howells switch (ret) { 4844343d008SDavid Howells case 0: 4854343d008SDavid Howells ret = count; 4864343d008SDavid Howells break; 4874343d008SDavid Howells 4884343d008SDavid Howells default: 4894343d008SDavid Howells pr_notice("kAFS: Unexpected error from FS.StoreData %d\n", ret); 4904343d008SDavid Howells /* Fall through */ 4914343d008SDavid Howells case -EACCES: 4924343d008SDavid Howells case -EPERM: 4934343d008SDavid Howells case -ENOKEY: 4944343d008SDavid Howells case -EKEYEXPIRED: 4954343d008SDavid Howells case -EKEYREJECTED: 4964343d008SDavid Howells case -EKEYREVOKED: 4974343d008SDavid Howells afs_redirty_pages(wbc, mapping, first, last); 4984343d008SDavid Howells mapping_set_error(mapping, ret); 4994343d008SDavid Howells break; 5004343d008SDavid Howells 50131143d5dSDavid Howells case -EDQUOT: 50231143d5dSDavid Howells case -ENOSPC: 5034343d008SDavid Howells afs_redirty_pages(wbc, mapping, first, last); 5044343d008SDavid Howells mapping_set_error(mapping, -ENOSPC); 50531143d5dSDavid Howells break; 5064343d008SDavid Howells 50731143d5dSDavid Howells case -EROFS: 50831143d5dSDavid Howells case -EIO: 50931143d5dSDavid Howells case -EREMOTEIO: 51031143d5dSDavid Howells case -EFBIG: 51131143d5dSDavid Howells case -ENOENT: 51231143d5dSDavid Howells case -ENOMEDIUM: 51331143d5dSDavid Howells case -ENXIO: 5144343d008SDavid Howells afs_kill_pages(mapping, first, last); 5154343d008SDavid Howells mapping_set_error(mapping, ret); 51631143d5dSDavid Howells break; 51731143d5dSDavid Howells } 51831143d5dSDavid Howells 51931143d5dSDavid Howells _leave(" = %d", ret); 52031143d5dSDavid Howells return ret; 52131143d5dSDavid Howells } 52231143d5dSDavid Howells 52331143d5dSDavid Howells /* 52431143d5dSDavid Howells * write a page back to the server 52531143d5dSDavid Howells * - the caller locked the page for us 52631143d5dSDavid Howells */ 52731143d5dSDavid Howells int afs_writepage(struct page *page, struct writeback_control *wbc) 52831143d5dSDavid Howells { 52931143d5dSDavid Howells int ret; 53031143d5dSDavid Howells 53131143d5dSDavid Howells _enter("{%lx},", page->index); 53231143d5dSDavid Howells 5334343d008SDavid Howells ret = afs_write_back_from_locked_page(page->mapping, wbc, page, 5344343d008SDavid Howells wbc->range_end >> PAGE_SHIFT); 53531143d5dSDavid Howells if (ret < 0) { 53631143d5dSDavid Howells _leave(" = %d", ret); 53731143d5dSDavid Howells return 0; 53831143d5dSDavid Howells } 53931143d5dSDavid Howells 54031143d5dSDavid Howells wbc->nr_to_write -= ret; 54131143d5dSDavid Howells 54231143d5dSDavid Howells _leave(" = 0"); 54331143d5dSDavid Howells return 0; 54431143d5dSDavid Howells } 54531143d5dSDavid Howells 54631143d5dSDavid Howells /* 54731143d5dSDavid Howells * write a region of pages back to the server 54831143d5dSDavid Howells */ 549c1206a2cSAdrian Bunk static int afs_writepages_region(struct address_space *mapping, 55031143d5dSDavid Howells struct writeback_control *wbc, 55131143d5dSDavid Howells pgoff_t index, pgoff_t end, pgoff_t *_next) 55231143d5dSDavid Howells { 55331143d5dSDavid Howells struct page *page; 55431143d5dSDavid Howells int ret, n; 55531143d5dSDavid Howells 55631143d5dSDavid Howells _enter(",,%lx,%lx,", index, end); 55731143d5dSDavid Howells 55831143d5dSDavid Howells do { 559aef6e415SJan Kara n = find_get_pages_range_tag(mapping, &index, end, 560aef6e415SJan Kara PAGECACHE_TAG_DIRTY, 1, &page); 56131143d5dSDavid Howells if (!n) 56231143d5dSDavid Howells break; 56331143d5dSDavid Howells 56431143d5dSDavid Howells _debug("wback %lx", page->index); 56531143d5dSDavid Howells 56631143d5dSDavid Howells /* at this point we hold neither mapping->tree_lock nor lock on 56731143d5dSDavid Howells * the page itself: the page may be truncated or invalidated 56831143d5dSDavid Howells * (changing page->mapping to NULL), or even swizzled back from 56931143d5dSDavid Howells * swapper_space to tmpfs file mapping 57031143d5dSDavid Howells */ 5714343d008SDavid Howells ret = lock_page_killable(page); 5724343d008SDavid Howells if (ret < 0) { 5734343d008SDavid Howells put_page(page); 5744343d008SDavid Howells _leave(" = %d", ret); 5754343d008SDavid Howells return ret; 5764343d008SDavid Howells } 57731143d5dSDavid Howells 578c5051c7bSDavid Howells if (page->mapping != mapping || !PageDirty(page)) { 57931143d5dSDavid Howells unlock_page(page); 58009cbfeafSKirill A. Shutemov put_page(page); 58131143d5dSDavid Howells continue; 58231143d5dSDavid Howells } 58331143d5dSDavid Howells 584c5051c7bSDavid Howells if (PageWriteback(page)) { 585c5051c7bSDavid Howells unlock_page(page); 58631143d5dSDavid Howells if (wbc->sync_mode != WB_SYNC_NONE) 58731143d5dSDavid Howells wait_on_page_writeback(page); 58829c8bbbdSDavid Howells put_page(page); 58931143d5dSDavid Howells continue; 59031143d5dSDavid Howells } 59131143d5dSDavid Howells 59265a15109SDavid Howells if (!clear_page_dirty_for_io(page)) 59365a15109SDavid Howells BUG(); 5944343d008SDavid Howells ret = afs_write_back_from_locked_page(mapping, wbc, page, end); 59509cbfeafSKirill A. Shutemov put_page(page); 59631143d5dSDavid Howells if (ret < 0) { 59731143d5dSDavid Howells _leave(" = %d", ret); 59831143d5dSDavid Howells return ret; 59931143d5dSDavid Howells } 60031143d5dSDavid Howells 60131143d5dSDavid Howells wbc->nr_to_write -= ret; 60231143d5dSDavid Howells 60331143d5dSDavid Howells cond_resched(); 60431143d5dSDavid Howells } while (index < end && wbc->nr_to_write > 0); 60531143d5dSDavid Howells 60631143d5dSDavid Howells *_next = index; 60731143d5dSDavid Howells _leave(" = 0 [%lx]", *_next); 60831143d5dSDavid Howells return 0; 60931143d5dSDavid Howells } 61031143d5dSDavid Howells 61131143d5dSDavid Howells /* 61231143d5dSDavid Howells * write some of the pending data back to the server 61331143d5dSDavid Howells */ 61431143d5dSDavid Howells int afs_writepages(struct address_space *mapping, 61531143d5dSDavid Howells struct writeback_control *wbc) 61631143d5dSDavid Howells { 61731143d5dSDavid Howells pgoff_t start, end, next; 61831143d5dSDavid Howells int ret; 61931143d5dSDavid Howells 62031143d5dSDavid Howells _enter(""); 62131143d5dSDavid Howells 62231143d5dSDavid Howells if (wbc->range_cyclic) { 62331143d5dSDavid Howells start = mapping->writeback_index; 62431143d5dSDavid Howells end = -1; 62531143d5dSDavid Howells ret = afs_writepages_region(mapping, wbc, start, end, &next); 6261b430beeSWu Fengguang if (start > 0 && wbc->nr_to_write > 0 && ret == 0) 62731143d5dSDavid Howells ret = afs_writepages_region(mapping, wbc, 0, start, 62831143d5dSDavid Howells &next); 62931143d5dSDavid Howells mapping->writeback_index = next; 63031143d5dSDavid Howells } else if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) { 63109cbfeafSKirill A. Shutemov end = (pgoff_t)(LLONG_MAX >> PAGE_SHIFT); 63231143d5dSDavid Howells ret = afs_writepages_region(mapping, wbc, 0, end, &next); 63331143d5dSDavid Howells if (wbc->nr_to_write > 0) 63431143d5dSDavid Howells mapping->writeback_index = next; 63531143d5dSDavid Howells } else { 63609cbfeafSKirill A. Shutemov start = wbc->range_start >> PAGE_SHIFT; 63709cbfeafSKirill A. Shutemov end = wbc->range_end >> PAGE_SHIFT; 63831143d5dSDavid Howells ret = afs_writepages_region(mapping, wbc, start, end, &next); 63931143d5dSDavid Howells } 64031143d5dSDavid Howells 64131143d5dSDavid Howells _leave(" = %d", ret); 64231143d5dSDavid Howells return ret; 64331143d5dSDavid Howells } 64431143d5dSDavid Howells 64531143d5dSDavid Howells /* 64631143d5dSDavid Howells * completion of write to server 64731143d5dSDavid Howells */ 64831143d5dSDavid Howells void afs_pages_written_back(struct afs_vnode *vnode, struct afs_call *call) 64931143d5dSDavid Howells { 65031143d5dSDavid Howells struct pagevec pv; 65113524ab3SDavid Howells unsigned long priv; 65231143d5dSDavid Howells unsigned count, loop; 65331143d5dSDavid Howells pgoff_t first = call->first, last = call->last; 65431143d5dSDavid Howells 65531143d5dSDavid Howells _enter("{%x:%u},{%lx-%lx}", 65631143d5dSDavid Howells vnode->fid.vid, vnode->fid.vnode, first, last); 65731143d5dSDavid Howells 65886679820SMel Gorman pagevec_init(&pv); 65931143d5dSDavid Howells 66031143d5dSDavid Howells do { 6615bbf5d39SDavid Howells _debug("done %lx-%lx", first, last); 66231143d5dSDavid Howells 66331143d5dSDavid Howells count = last - first + 1; 66431143d5dSDavid Howells if (count > PAGEVEC_SIZE) 66531143d5dSDavid Howells count = PAGEVEC_SIZE; 6664343d008SDavid Howells pv.nr = find_get_pages_contig(vnode->vfs_inode.i_mapping, 6674343d008SDavid Howells first, count, pv.pages); 66831143d5dSDavid Howells ASSERTCMP(pv.nr, ==, count); 66931143d5dSDavid Howells 67031143d5dSDavid Howells for (loop = 0; loop < count; loop++) { 67113524ab3SDavid Howells priv = page_private(pv.pages[loop]); 67213524ab3SDavid Howells trace_afs_page_dirty(vnode, tracepoint_string("clear"), 67313524ab3SDavid Howells pv.pages[loop]->index, priv); 6744343d008SDavid Howells set_page_private(pv.pages[loop], 0); 6754343d008SDavid Howells end_page_writeback(pv.pages[loop]); 67631143d5dSDavid Howells } 67731143d5dSDavid Howells first += count; 67831143d5dSDavid Howells __pagevec_release(&pv); 6795bbf5d39SDavid Howells } while (first <= last); 68031143d5dSDavid Howells 6814343d008SDavid Howells afs_prune_wb_keys(vnode); 68231143d5dSDavid Howells _leave(""); 68331143d5dSDavid Howells } 68431143d5dSDavid Howells 68531143d5dSDavid Howells /* 68631143d5dSDavid Howells * write to an AFS file 68731143d5dSDavid Howells */ 68850b5551dSAl Viro ssize_t afs_file_write(struct kiocb *iocb, struct iov_iter *from) 68931143d5dSDavid Howells { 690496ad9aaSAl Viro struct afs_vnode *vnode = AFS_FS_I(file_inode(iocb->ki_filp)); 69131143d5dSDavid Howells ssize_t result; 69250b5551dSAl Viro size_t count = iov_iter_count(from); 69331143d5dSDavid Howells 69450b5551dSAl Viro _enter("{%x.%u},{%zu},", 69550b5551dSAl Viro vnode->fid.vid, vnode->fid.vnode, count); 69631143d5dSDavid Howells 69731143d5dSDavid Howells if (IS_SWAPFILE(&vnode->vfs_inode)) { 69831143d5dSDavid Howells printk(KERN_INFO 69931143d5dSDavid Howells "AFS: Attempt to write to active swap file!\n"); 70031143d5dSDavid Howells return -EBUSY; 70131143d5dSDavid Howells } 70231143d5dSDavid Howells 70331143d5dSDavid Howells if (!count) 70431143d5dSDavid Howells return 0; 70531143d5dSDavid Howells 70650b5551dSAl Viro result = generic_file_write_iter(iocb, from); 70731143d5dSDavid Howells 70831143d5dSDavid Howells _leave(" = %zd", result); 70931143d5dSDavid Howells return result; 71031143d5dSDavid Howells } 71131143d5dSDavid Howells 71231143d5dSDavid Howells /* 71331143d5dSDavid Howells * flush any dirty pages for this process, and check for write errors. 71431143d5dSDavid Howells * - the return status from this call provides a reliable indication of 71531143d5dSDavid Howells * whether any write errors occurred for this process. 71631143d5dSDavid Howells */ 71702c24a82SJosef Bacik int afs_fsync(struct file *file, loff_t start, loff_t end, int datasync) 71831143d5dSDavid Howells { 7193c981bfcSAl Viro struct inode *inode = file_inode(file); 7203c981bfcSAl Viro struct afs_vnode *vnode = AFS_FS_I(inode); 72131143d5dSDavid Howells 7223c981bfcSAl Viro _enter("{%x:%u},{n=%pD},%d", 7233c981bfcSAl Viro vnode->fid.vid, vnode->fid.vnode, file, 72431143d5dSDavid Howells datasync); 72531143d5dSDavid Howells 7264343d008SDavid Howells return file_write_and_wait_range(file, start, end); 72731143d5dSDavid Howells } 7289b3f26c9SDavid Howells 7299b3f26c9SDavid Howells /* 73058fed94dSDavid Howells * Flush out all outstanding writes on a file opened for writing when it is 73158fed94dSDavid Howells * closed. 73258fed94dSDavid Howells */ 73358fed94dSDavid Howells int afs_flush(struct file *file, fl_owner_t id) 73458fed94dSDavid Howells { 73558fed94dSDavid Howells _enter(""); 73658fed94dSDavid Howells 73758fed94dSDavid Howells if ((file->f_mode & FMODE_WRITE) == 0) 73858fed94dSDavid Howells return 0; 73958fed94dSDavid Howells 74058fed94dSDavid Howells return vfs_fsync(file, 0); 74158fed94dSDavid Howells } 74258fed94dSDavid Howells 74358fed94dSDavid Howells /* 7449b3f26c9SDavid Howells * notification that a previously read-only page is about to become writable 7459b3f26c9SDavid Howells * - if it returns an error, the caller will deliver a bus error signal 7469b3f26c9SDavid Howells */ 7471cf7a151SDavid Howells int afs_page_mkwrite(struct vm_fault *vmf) 7489b3f26c9SDavid Howells { 7491cf7a151SDavid Howells struct file *file = vmf->vma->vm_file; 7501cf7a151SDavid Howells struct inode *inode = file_inode(file); 7511cf7a151SDavid Howells struct afs_vnode *vnode = AFS_FS_I(inode); 7521cf7a151SDavid Howells unsigned long priv; 7539b3f26c9SDavid Howells 7549b3f26c9SDavid Howells _enter("{{%x:%u}},{%lx}", 7551cf7a151SDavid Howells vnode->fid.vid, vnode->fid.vnode, vmf->page->index); 7569b3f26c9SDavid Howells 7571cf7a151SDavid Howells sb_start_pagefault(inode->i_sb); 7581cf7a151SDavid Howells 7591cf7a151SDavid Howells /* Wait for the page to be written to the cache before we allow it to 7601cf7a151SDavid Howells * be modified. We then assume the entire page will need writing back. 7611cf7a151SDavid Howells */ 7629b3f26c9SDavid Howells #ifdef CONFIG_AFS_FSCACHE 7631cf7a151SDavid Howells fscache_wait_on_page_write(vnode->cache, vmf->page); 7649b3f26c9SDavid Howells #endif 7659b3f26c9SDavid Howells 7661cf7a151SDavid Howells if (PageWriteback(vmf->page) && 7671cf7a151SDavid Howells wait_on_page_bit_killable(vmf->page, PG_writeback) < 0) 7681cf7a151SDavid Howells return VM_FAULT_RETRY; 7691cf7a151SDavid Howells 7701cf7a151SDavid Howells if (lock_page_killable(vmf->page) < 0) 7711cf7a151SDavid Howells return VM_FAULT_RETRY; 7721cf7a151SDavid Howells 7731cf7a151SDavid Howells /* We mustn't change page->private until writeback is complete as that 7741cf7a151SDavid Howells * details the portion of the page we need to write back and we might 7751cf7a151SDavid Howells * need to redirty the page if there's a problem. 7761cf7a151SDavid Howells */ 7771cf7a151SDavid Howells wait_on_page_writeback(vmf->page); 7781cf7a151SDavid Howells 7791cf7a151SDavid Howells priv = (unsigned long)PAGE_SIZE << AFS_PRIV_SHIFT; /* To */ 7801cf7a151SDavid Howells priv |= 0; /* From */ 78113524ab3SDavid Howells trace_afs_page_dirty(vnode, tracepoint_string("mkwrite"), 78213524ab3SDavid Howells vmf->page->index, priv); 7831cf7a151SDavid Howells SetPagePrivate(vmf->page); 7841cf7a151SDavid Howells set_page_private(vmf->page, priv); 7851cf7a151SDavid Howells 7861cf7a151SDavid Howells sb_end_pagefault(inode->i_sb); 7871cf7a151SDavid Howells return VM_FAULT_LOCKED; 7889b3f26c9SDavid Howells } 7894343d008SDavid Howells 7904343d008SDavid Howells /* 7914343d008SDavid Howells * Prune the keys cached for writeback. The caller must hold vnode->wb_lock. 7924343d008SDavid Howells */ 7934343d008SDavid Howells void afs_prune_wb_keys(struct afs_vnode *vnode) 7944343d008SDavid Howells { 7954343d008SDavid Howells LIST_HEAD(graveyard); 7964343d008SDavid Howells struct afs_wb_key *wbk, *tmp; 7974343d008SDavid Howells 7984343d008SDavid Howells /* Discard unused keys */ 7994343d008SDavid Howells spin_lock(&vnode->wb_lock); 8004343d008SDavid Howells 8014343d008SDavid Howells if (!mapping_tagged(&vnode->vfs_inode.i_data, PAGECACHE_TAG_WRITEBACK) && 8024343d008SDavid Howells !mapping_tagged(&vnode->vfs_inode.i_data, PAGECACHE_TAG_DIRTY)) { 8034343d008SDavid Howells list_for_each_entry_safe(wbk, tmp, &vnode->wb_keys, vnode_link) { 8044343d008SDavid Howells if (refcount_read(&wbk->usage) == 1) 8054343d008SDavid Howells list_move(&wbk->vnode_link, &graveyard); 8064343d008SDavid Howells } 8074343d008SDavid Howells } 8084343d008SDavid Howells 8094343d008SDavid Howells spin_unlock(&vnode->wb_lock); 8104343d008SDavid Howells 8114343d008SDavid Howells while (!list_empty(&graveyard)) { 8124343d008SDavid Howells wbk = list_entry(graveyard.next, struct afs_wb_key, vnode_link); 8134343d008SDavid Howells list_del(&wbk->vnode_link); 8144343d008SDavid Howells afs_put_wb_key(wbk); 8154343d008SDavid Howells } 8164343d008SDavid Howells } 8174343d008SDavid Howells 8184343d008SDavid Howells /* 8194343d008SDavid Howells * Clean up a page during invalidation. 8204343d008SDavid Howells */ 8214343d008SDavid Howells int afs_launder_page(struct page *page) 8224343d008SDavid Howells { 8234343d008SDavid Howells struct address_space *mapping = page->mapping; 8244343d008SDavid Howells struct afs_vnode *vnode = AFS_FS_I(mapping->host); 8254343d008SDavid Howells unsigned long priv; 8264343d008SDavid Howells unsigned int f, t; 8274343d008SDavid Howells int ret = 0; 8284343d008SDavid Howells 8294343d008SDavid Howells _enter("{%lx}", page->index); 8304343d008SDavid Howells 8314343d008SDavid Howells priv = page_private(page); 8324343d008SDavid Howells if (clear_page_dirty_for_io(page)) { 8334343d008SDavid Howells f = 0; 8344343d008SDavid Howells t = PAGE_SIZE; 8354343d008SDavid Howells if (PagePrivate(page)) { 8364343d008SDavid Howells f = priv & AFS_PRIV_MAX; 8374343d008SDavid Howells t = priv >> AFS_PRIV_SHIFT; 8384343d008SDavid Howells } 8394343d008SDavid Howells 84013524ab3SDavid Howells trace_afs_page_dirty(vnode, tracepoint_string("launder"), 84113524ab3SDavid Howells page->index, priv); 8424343d008SDavid Howells ret = afs_store_data(mapping, page->index, page->index, t, f); 8434343d008SDavid Howells } 8444343d008SDavid Howells 84513524ab3SDavid Howells trace_afs_page_dirty(vnode, tracepoint_string("laundered"), 84613524ab3SDavid Howells page->index, priv); 8474343d008SDavid Howells set_page_private(page, 0); 8484343d008SDavid Howells ClearPagePrivate(page); 8494343d008SDavid Howells 8504343d008SDavid Howells #ifdef CONFIG_AFS_FSCACHE 8514343d008SDavid Howells if (PageFsCache(page)) { 8524343d008SDavid Howells fscache_wait_on_page_write(vnode->cache, page); 8534343d008SDavid Howells fscache_uncache_page(vnode->cache, page); 8544343d008SDavid Howells } 8554343d008SDavid Howells #endif 8564343d008SDavid Howells return ret; 85731143d5dSDavid Howells } 858