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) { 1225a039c32SDavid Howells if (PageWriteback(page)) { 1235a039c32SDavid Howells trace_afs_page_dirty(vnode, tracepoint_string("alrdy"), 1245a039c32SDavid Howells page->index, priv); 1255a039c32SDavid Howells goto flush_conflicting_write; 1265a039c32SDavid Howells } 1274343d008SDavid Howells if (to < f || from > t) 1284343d008SDavid Howells goto flush_conflicting_write; 1294343d008SDavid Howells if (from < f) 1304343d008SDavid Howells f = from; 1314343d008SDavid Howells if (to > t) 1324343d008SDavid Howells t = to; 1334343d008SDavid Howells } else { 1344343d008SDavid Howells f = from; 1354343d008SDavid Howells t = to; 13631143d5dSDavid Howells } 13731143d5dSDavid Howells 1384343d008SDavid Howells priv = (unsigned long)t << AFS_PRIV_SHIFT; 1394343d008SDavid Howells priv |= f; 14013524ab3SDavid Howells trace_afs_page_dirty(vnode, tracepoint_string("begin"), 14113524ab3SDavid Howells page->index, priv); 14231143d5dSDavid Howells SetPagePrivate(page); 1434343d008SDavid Howells set_page_private(page, priv); 1444343d008SDavid Howells _leave(" = 0"); 14531143d5dSDavid Howells return 0; 14631143d5dSDavid Howells 1474343d008SDavid Howells /* The previous write and this write aren't adjacent or overlapping, so 1484343d008SDavid Howells * flush the page out. 1494343d008SDavid Howells */ 1504343d008SDavid Howells flush_conflicting_write: 15131143d5dSDavid Howells _debug("flush conflict"); 1524343d008SDavid Howells ret = write_one_page(page); 15331143d5dSDavid Howells if (ret < 0) { 15431143d5dSDavid Howells _leave(" = %d", ret); 15531143d5dSDavid Howells return ret; 15631143d5dSDavid Howells } 15731143d5dSDavid Howells 1584343d008SDavid Howells ret = lock_page_killable(page); 1594343d008SDavid Howells if (ret < 0) { 1604343d008SDavid Howells _leave(" = %d", ret); 1614343d008SDavid Howells return ret; 1624343d008SDavid Howells } 16331143d5dSDavid Howells goto try_again; 16431143d5dSDavid Howells } 16531143d5dSDavid Howells 16631143d5dSDavid Howells /* 16731143d5dSDavid Howells * finalise part of a write to a page 16831143d5dSDavid Howells */ 16915b4650eSNick Piggin int afs_write_end(struct file *file, struct address_space *mapping, 17015b4650eSNick Piggin loff_t pos, unsigned len, unsigned copied, 17115b4650eSNick Piggin struct page *page, void *fsdata) 17231143d5dSDavid Howells { 173496ad9aaSAl Viro struct afs_vnode *vnode = AFS_FS_I(file_inode(file)); 174215804a9SDavid Howells struct key *key = afs_file_key(file); 17531143d5dSDavid Howells loff_t i_size, maybe_i_size; 176e8e581a8SDavid Howells int ret; 17731143d5dSDavid Howells 17815b4650eSNick Piggin _enter("{%x:%u},{%lx}", 17915b4650eSNick Piggin vnode->fid.vid, vnode->fid.vnode, page->index); 18031143d5dSDavid Howells 18115b4650eSNick Piggin maybe_i_size = pos + copied; 18231143d5dSDavid Howells 18331143d5dSDavid Howells i_size = i_size_read(&vnode->vfs_inode); 18431143d5dSDavid Howells if (maybe_i_size > i_size) { 1854343d008SDavid Howells spin_lock(&vnode->wb_lock); 18631143d5dSDavid Howells i_size = i_size_read(&vnode->vfs_inode); 18731143d5dSDavid Howells if (maybe_i_size > i_size) 18831143d5dSDavid Howells i_size_write(&vnode->vfs_inode, maybe_i_size); 1894343d008SDavid Howells spin_unlock(&vnode->wb_lock); 19031143d5dSDavid Howells } 19131143d5dSDavid Howells 192e8e581a8SDavid Howells if (!PageUptodate(page)) { 193e8e581a8SDavid Howells if (copied < len) { 194e8e581a8SDavid Howells /* Try and load any missing data from the server. The 195e8e581a8SDavid Howells * unmarshalling routine will take care of clearing any 196e8e581a8SDavid Howells * bits that are beyond the EOF. 197e8e581a8SDavid Howells */ 198e8e581a8SDavid Howells ret = afs_fill_page(vnode, key, pos + copied, 199e8e581a8SDavid Howells len - copied, page); 200e8e581a8SDavid Howells if (ret < 0) 201e8e581a8SDavid Howells return ret; 202e8e581a8SDavid Howells } 203e8e581a8SDavid Howells SetPageUptodate(page); 204e8e581a8SDavid Howells } 205e8e581a8SDavid Howells 20631143d5dSDavid Howells set_page_dirty(page); 20731143d5dSDavid Howells if (PageDirty(page)) 20831143d5dSDavid Howells _debug("dirtied"); 20915b4650eSNick Piggin unlock_page(page); 21009cbfeafSKirill A. Shutemov put_page(page); 21131143d5dSDavid Howells 21215b4650eSNick Piggin return copied; 21331143d5dSDavid Howells } 21431143d5dSDavid Howells 21531143d5dSDavid Howells /* 21631143d5dSDavid Howells * kill all the pages in the given range 21731143d5dSDavid Howells */ 2184343d008SDavid Howells static void afs_kill_pages(struct address_space *mapping, 21931143d5dSDavid Howells pgoff_t first, pgoff_t last) 22031143d5dSDavid Howells { 2214343d008SDavid Howells struct afs_vnode *vnode = AFS_FS_I(mapping->host); 22231143d5dSDavid Howells struct pagevec pv; 22331143d5dSDavid Howells unsigned count, loop; 22431143d5dSDavid Howells 22531143d5dSDavid Howells _enter("{%x:%u},%lx-%lx", 22631143d5dSDavid Howells vnode->fid.vid, vnode->fid.vnode, first, last); 22731143d5dSDavid Howells 22886679820SMel Gorman pagevec_init(&pv); 22931143d5dSDavid Howells 23031143d5dSDavid Howells do { 23131143d5dSDavid Howells _debug("kill %lx-%lx", first, last); 23231143d5dSDavid Howells 23331143d5dSDavid Howells count = last - first + 1; 23431143d5dSDavid Howells if (count > PAGEVEC_SIZE) 23531143d5dSDavid Howells count = PAGEVEC_SIZE; 2364343d008SDavid Howells pv.nr = find_get_pages_contig(mapping, first, count, pv.pages); 23731143d5dSDavid Howells ASSERTCMP(pv.nr, ==, count); 23831143d5dSDavid Howells 23931143d5dSDavid Howells for (loop = 0; loop < count; loop++) { 2407286a35eSDavid Howells struct page *page = pv.pages[loop]; 2417286a35eSDavid Howells ClearPageUptodate(page); 2427286a35eSDavid Howells SetPageError(page); 2434343d008SDavid Howells end_page_writeback(page); 2444343d008SDavid Howells if (page->index >= first) 2454343d008SDavid Howells first = page->index + 1; 2464343d008SDavid Howells lock_page(page); 2474343d008SDavid Howells generic_error_remove_page(mapping, page); 2484343d008SDavid Howells } 2494343d008SDavid Howells 2504343d008SDavid Howells __pagevec_release(&pv); 2514343d008SDavid Howells } while (first <= last); 2524343d008SDavid Howells 2534343d008SDavid Howells _leave(""); 2544343d008SDavid Howells } 2554343d008SDavid Howells 2564343d008SDavid Howells /* 2574343d008SDavid Howells * Redirty all the pages in a given range. 2584343d008SDavid Howells */ 2594343d008SDavid Howells static void afs_redirty_pages(struct writeback_control *wbc, 2604343d008SDavid Howells struct address_space *mapping, 2614343d008SDavid Howells pgoff_t first, pgoff_t last) 2624343d008SDavid Howells { 2634343d008SDavid Howells struct afs_vnode *vnode = AFS_FS_I(mapping->host); 2644343d008SDavid Howells struct pagevec pv; 2654343d008SDavid Howells unsigned count, loop; 2664343d008SDavid Howells 2674343d008SDavid Howells _enter("{%x:%u},%lx-%lx", 2684343d008SDavid Howells vnode->fid.vid, vnode->fid.vnode, first, last); 2694343d008SDavid Howells 270487e2c9fSLinus Torvalds pagevec_init(&pv); 2714343d008SDavid Howells 2724343d008SDavid Howells do { 2734343d008SDavid Howells _debug("redirty %lx-%lx", first, last); 2744343d008SDavid Howells 2754343d008SDavid Howells count = last - first + 1; 2764343d008SDavid Howells if (count > PAGEVEC_SIZE) 2774343d008SDavid Howells count = PAGEVEC_SIZE; 2784343d008SDavid Howells pv.nr = find_get_pages_contig(mapping, first, count, pv.pages); 2794343d008SDavid Howells ASSERTCMP(pv.nr, ==, count); 2804343d008SDavid Howells 2814343d008SDavid Howells for (loop = 0; loop < count; loop++) { 2824343d008SDavid Howells struct page *page = pv.pages[loop]; 2834343d008SDavid Howells 2844343d008SDavid Howells redirty_page_for_writepage(wbc, page); 2857286a35eSDavid Howells end_page_writeback(page); 2867286a35eSDavid Howells if (page->index >= first) 2877286a35eSDavid Howells first = page->index + 1; 28831143d5dSDavid Howells } 28931143d5dSDavid Howells 29031143d5dSDavid Howells __pagevec_release(&pv); 2914343d008SDavid Howells } while (first <= last); 29231143d5dSDavid Howells 29331143d5dSDavid Howells _leave(""); 29431143d5dSDavid Howells } 29531143d5dSDavid Howells 29631143d5dSDavid Howells /* 297d2ddc776SDavid Howells * write to a file 29831143d5dSDavid Howells */ 2994343d008SDavid Howells static int afs_store_data(struct address_space *mapping, 3004343d008SDavid Howells pgoff_t first, pgoff_t last, 301d2ddc776SDavid Howells unsigned offset, unsigned to) 30231143d5dSDavid Howells { 3034343d008SDavid Howells struct afs_vnode *vnode = AFS_FS_I(mapping->host); 304d2ddc776SDavid Howells struct afs_fs_cursor fc; 3054343d008SDavid Howells struct afs_wb_key *wbk = NULL; 3064343d008SDavid Howells struct list_head *p; 3074343d008SDavid Howells int ret = -ENOKEY, ret2; 308d2ddc776SDavid Howells 3094343d008SDavid Howells _enter("%s{%x:%u.%u},%lx,%lx,%x,%x", 310d2ddc776SDavid Howells vnode->volume->name, 311d2ddc776SDavid Howells vnode->fid.vid, 312d2ddc776SDavid Howells vnode->fid.vnode, 313d2ddc776SDavid Howells vnode->fid.unique, 314d2ddc776SDavid Howells first, last, offset, to); 315d2ddc776SDavid Howells 3164343d008SDavid Howells spin_lock(&vnode->wb_lock); 3174343d008SDavid Howells p = vnode->wb_keys.next; 3184343d008SDavid Howells 3194343d008SDavid Howells /* Iterate through the list looking for a valid key to use. */ 3204343d008SDavid Howells try_next_key: 3214343d008SDavid Howells while (p != &vnode->wb_keys) { 3224343d008SDavid Howells wbk = list_entry(p, struct afs_wb_key, vnode_link); 3234343d008SDavid Howells _debug("wbk %u", key_serial(wbk->key)); 3244343d008SDavid Howells ret2 = key_validate(wbk->key); 3254343d008SDavid Howells if (ret2 == 0) 3264343d008SDavid Howells goto found_key; 3274343d008SDavid Howells if (ret == -ENOKEY) 3284343d008SDavid Howells ret = ret2; 3294343d008SDavid Howells p = p->next; 3304343d008SDavid Howells } 3314343d008SDavid Howells 3324343d008SDavid Howells spin_unlock(&vnode->wb_lock); 3334343d008SDavid Howells afs_put_wb_key(wbk); 3344343d008SDavid Howells _leave(" = %d [no keys]", ret); 3354343d008SDavid Howells return ret; 3364343d008SDavid Howells 3374343d008SDavid Howells found_key: 3384343d008SDavid Howells refcount_inc(&wbk->usage); 3394343d008SDavid Howells spin_unlock(&vnode->wb_lock); 3404343d008SDavid Howells 3414343d008SDavid Howells _debug("USE WB KEY %u", key_serial(wbk->key)); 3424343d008SDavid Howells 343d2ddc776SDavid Howells ret = -ERESTARTSYS; 3444343d008SDavid Howells if (afs_begin_vnode_operation(&fc, vnode, wbk->key)) { 345d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 346d2ddc776SDavid Howells fc.cb_break = vnode->cb_break + vnode->cb_s_break; 3474343d008SDavid Howells afs_fs_store_data(&fc, mapping, first, last, offset, to); 348d2ddc776SDavid Howells } 349d2ddc776SDavid Howells 350d2ddc776SDavid Howells afs_check_for_remote_deletion(&fc, fc.vnode); 351d2ddc776SDavid Howells afs_vnode_commit_status(&fc, vnode, fc.cb_break); 352d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 353d2ddc776SDavid Howells } 354d2ddc776SDavid Howells 3554343d008SDavid Howells switch (ret) { 3564343d008SDavid Howells case -EACCES: 3574343d008SDavid Howells case -EPERM: 3584343d008SDavid Howells case -ENOKEY: 3594343d008SDavid Howells case -EKEYEXPIRED: 3604343d008SDavid Howells case -EKEYREJECTED: 3614343d008SDavid Howells case -EKEYREVOKED: 3624343d008SDavid Howells _debug("next"); 3634343d008SDavid Howells spin_lock(&vnode->wb_lock); 3644343d008SDavid Howells p = wbk->vnode_link.next; 3654343d008SDavid Howells afs_put_wb_key(wbk); 3664343d008SDavid Howells goto try_next_key; 3674343d008SDavid Howells } 3684343d008SDavid Howells 3694343d008SDavid Howells afs_put_wb_key(wbk); 370d2ddc776SDavid Howells _leave(" = %d", ret); 371d2ddc776SDavid Howells return ret; 372d2ddc776SDavid Howells } 373d2ddc776SDavid Howells 374d2ddc776SDavid Howells /* 3754343d008SDavid Howells * Synchronously write back the locked page and any subsequent non-locked dirty 3764343d008SDavid Howells * pages. 37731143d5dSDavid Howells */ 3784343d008SDavid Howells static int afs_write_back_from_locked_page(struct address_space *mapping, 3794343d008SDavid Howells struct writeback_control *wbc, 3804343d008SDavid Howells struct page *primary_page, 3814343d008SDavid Howells pgoff_t final_page) 38231143d5dSDavid Howells { 38313524ab3SDavid Howells struct afs_vnode *vnode = AFS_FS_I(mapping->host); 38431143d5dSDavid Howells struct page *pages[8], *page; 3854343d008SDavid Howells unsigned long count, priv; 3864343d008SDavid Howells unsigned n, offset, to, f, t; 38731143d5dSDavid Howells pgoff_t start, first, last; 38831143d5dSDavid Howells int loop, ret; 38931143d5dSDavid Howells 39031143d5dSDavid Howells _enter(",%lx", primary_page->index); 39131143d5dSDavid Howells 39231143d5dSDavid Howells count = 1; 39331143d5dSDavid Howells if (test_set_page_writeback(primary_page)) 39431143d5dSDavid Howells BUG(); 39531143d5dSDavid Howells 3964343d008SDavid Howells /* Find all consecutive lockable dirty pages that have contiguous 3974343d008SDavid Howells * written regions, stopping when we find a page that is not 3984343d008SDavid Howells * immediately lockable, is not dirty or is missing, or we reach the 3994343d008SDavid Howells * end of the range. 4004343d008SDavid Howells */ 40131143d5dSDavid Howells start = primary_page->index; 4024343d008SDavid Howells priv = page_private(primary_page); 4034343d008SDavid Howells offset = priv & AFS_PRIV_MAX; 4044343d008SDavid Howells to = priv >> AFS_PRIV_SHIFT; 40513524ab3SDavid Howells trace_afs_page_dirty(vnode, tracepoint_string("store"), 40613524ab3SDavid Howells primary_page->index, priv); 4074343d008SDavid Howells 4084343d008SDavid Howells WARN_ON(offset == to); 40913524ab3SDavid Howells if (offset == to) 41013524ab3SDavid Howells trace_afs_page_dirty(vnode, tracepoint_string("WARN"), 41113524ab3SDavid Howells primary_page->index, priv); 4124343d008SDavid Howells 4134343d008SDavid Howells if (start >= final_page || to < PAGE_SIZE) 41431143d5dSDavid Howells goto no_more; 4154343d008SDavid Howells 41631143d5dSDavid Howells start++; 41731143d5dSDavid Howells do { 41831143d5dSDavid Howells _debug("more %lx [%lx]", start, count); 4194343d008SDavid Howells n = final_page - start + 1; 42031143d5dSDavid Howells if (n > ARRAY_SIZE(pages)) 42131143d5dSDavid Howells n = ARRAY_SIZE(pages); 4224343d008SDavid Howells n = find_get_pages_contig(mapping, start, ARRAY_SIZE(pages), pages); 42331143d5dSDavid Howells _debug("fgpc %u", n); 42431143d5dSDavid Howells if (n == 0) 42531143d5dSDavid Howells goto no_more; 42631143d5dSDavid Howells if (pages[0]->index != start) { 4279d577b6aSDavid Howells do { 4289d577b6aSDavid Howells put_page(pages[--n]); 4299d577b6aSDavid Howells } while (n > 0); 43031143d5dSDavid Howells goto no_more; 43131143d5dSDavid Howells } 43231143d5dSDavid Howells 43331143d5dSDavid Howells for (loop = 0; loop < n; loop++) { 4344343d008SDavid Howells if (to != PAGE_SIZE) 4354343d008SDavid Howells break; 43631143d5dSDavid Howells page = pages[loop]; 4374343d008SDavid Howells if (page->index > final_page) 43831143d5dSDavid Howells break; 439529ae9aaSNick Piggin if (!trylock_page(page)) 44031143d5dSDavid Howells break; 4414343d008SDavid Howells if (!PageDirty(page) || PageWriteback(page)) { 44231143d5dSDavid Howells unlock_page(page); 44331143d5dSDavid Howells break; 44431143d5dSDavid Howells } 4454343d008SDavid Howells 4464343d008SDavid Howells priv = page_private(page); 4474343d008SDavid Howells f = priv & AFS_PRIV_MAX; 4484343d008SDavid Howells t = priv >> AFS_PRIV_SHIFT; 4494343d008SDavid Howells if (f != 0) { 4504343d008SDavid Howells unlock_page(page); 4514343d008SDavid Howells break; 4524343d008SDavid Howells } 4534343d008SDavid Howells to = t; 4544343d008SDavid Howells 45513524ab3SDavid Howells trace_afs_page_dirty(vnode, tracepoint_string("store+"), 45613524ab3SDavid Howells page->index, priv); 45713524ab3SDavid Howells 45831143d5dSDavid Howells if (!clear_page_dirty_for_io(page)) 45931143d5dSDavid Howells BUG(); 46031143d5dSDavid Howells if (test_set_page_writeback(page)) 46131143d5dSDavid Howells BUG(); 46231143d5dSDavid Howells unlock_page(page); 46331143d5dSDavid Howells put_page(page); 46431143d5dSDavid Howells } 46531143d5dSDavid Howells count += loop; 46631143d5dSDavid Howells if (loop < n) { 46731143d5dSDavid Howells for (; loop < n; loop++) 46831143d5dSDavid Howells put_page(pages[loop]); 46931143d5dSDavid Howells goto no_more; 47031143d5dSDavid Howells } 47131143d5dSDavid Howells 47231143d5dSDavid Howells start += loop; 4734343d008SDavid Howells } while (start <= final_page && count < 65536); 47431143d5dSDavid Howells 47531143d5dSDavid Howells no_more: 4764343d008SDavid Howells /* We now have a contiguous set of dirty pages, each with writeback 4774343d008SDavid Howells * set; the first page is still locked at this point, but all the rest 4784343d008SDavid Howells * have been unlocked. 4794343d008SDavid Howells */ 4804343d008SDavid Howells unlock_page(primary_page); 4814343d008SDavid Howells 48231143d5dSDavid Howells first = primary_page->index; 48331143d5dSDavid Howells last = first + count - 1; 48431143d5dSDavid Howells 48531143d5dSDavid Howells _debug("write back %lx[%u..] to %lx[..%u]", first, offset, last, to); 48631143d5dSDavid Howells 4874343d008SDavid Howells ret = afs_store_data(mapping, first, last, offset, to); 48831143d5dSDavid Howells switch (ret) { 4894343d008SDavid Howells case 0: 4904343d008SDavid Howells ret = count; 4914343d008SDavid Howells break; 4924343d008SDavid Howells 4934343d008SDavid Howells default: 4944343d008SDavid Howells pr_notice("kAFS: Unexpected error from FS.StoreData %d\n", ret); 4954343d008SDavid Howells /* Fall through */ 4964343d008SDavid Howells case -EACCES: 4974343d008SDavid Howells case -EPERM: 4984343d008SDavid Howells case -ENOKEY: 4994343d008SDavid Howells case -EKEYEXPIRED: 5004343d008SDavid Howells case -EKEYREJECTED: 5014343d008SDavid Howells case -EKEYREVOKED: 5024343d008SDavid Howells afs_redirty_pages(wbc, mapping, first, last); 5034343d008SDavid Howells mapping_set_error(mapping, ret); 5044343d008SDavid Howells break; 5054343d008SDavid Howells 50631143d5dSDavid Howells case -EDQUOT: 50731143d5dSDavid Howells case -ENOSPC: 5084343d008SDavid Howells afs_redirty_pages(wbc, mapping, first, last); 5094343d008SDavid Howells mapping_set_error(mapping, -ENOSPC); 51031143d5dSDavid Howells break; 5114343d008SDavid Howells 51231143d5dSDavid Howells case -EROFS: 51331143d5dSDavid Howells case -EIO: 51431143d5dSDavid Howells case -EREMOTEIO: 51531143d5dSDavid Howells case -EFBIG: 51631143d5dSDavid Howells case -ENOENT: 51731143d5dSDavid Howells case -ENOMEDIUM: 51831143d5dSDavid Howells case -ENXIO: 5194343d008SDavid Howells afs_kill_pages(mapping, first, last); 5204343d008SDavid Howells mapping_set_error(mapping, ret); 52131143d5dSDavid Howells break; 52231143d5dSDavid Howells } 52331143d5dSDavid Howells 52431143d5dSDavid Howells _leave(" = %d", ret); 52531143d5dSDavid Howells return ret; 52631143d5dSDavid Howells } 52731143d5dSDavid Howells 52831143d5dSDavid Howells /* 52931143d5dSDavid Howells * write a page back to the server 53031143d5dSDavid Howells * - the caller locked the page for us 53131143d5dSDavid Howells */ 53231143d5dSDavid Howells int afs_writepage(struct page *page, struct writeback_control *wbc) 53331143d5dSDavid Howells { 53431143d5dSDavid Howells int ret; 53531143d5dSDavid Howells 53631143d5dSDavid Howells _enter("{%lx},", page->index); 53731143d5dSDavid Howells 5384343d008SDavid Howells ret = afs_write_back_from_locked_page(page->mapping, wbc, page, 5394343d008SDavid Howells wbc->range_end >> PAGE_SHIFT); 54031143d5dSDavid Howells if (ret < 0) { 54131143d5dSDavid Howells _leave(" = %d", ret); 54231143d5dSDavid Howells return 0; 54331143d5dSDavid Howells } 54431143d5dSDavid Howells 54531143d5dSDavid Howells wbc->nr_to_write -= ret; 54631143d5dSDavid Howells 54731143d5dSDavid Howells _leave(" = 0"); 54831143d5dSDavid Howells return 0; 54931143d5dSDavid Howells } 55031143d5dSDavid Howells 55131143d5dSDavid Howells /* 55231143d5dSDavid Howells * write a region of pages back to the server 55331143d5dSDavid Howells */ 554c1206a2cSAdrian Bunk static int afs_writepages_region(struct address_space *mapping, 55531143d5dSDavid Howells struct writeback_control *wbc, 55631143d5dSDavid Howells pgoff_t index, pgoff_t end, pgoff_t *_next) 55731143d5dSDavid Howells { 55831143d5dSDavid Howells struct page *page; 55931143d5dSDavid Howells int ret, n; 56031143d5dSDavid Howells 56131143d5dSDavid Howells _enter(",,%lx,%lx,", index, end); 56231143d5dSDavid Howells 56331143d5dSDavid Howells do { 564aef6e415SJan Kara n = find_get_pages_range_tag(mapping, &index, end, 565aef6e415SJan Kara PAGECACHE_TAG_DIRTY, 1, &page); 56631143d5dSDavid Howells if (!n) 56731143d5dSDavid Howells break; 56831143d5dSDavid Howells 56931143d5dSDavid Howells _debug("wback %lx", page->index); 57031143d5dSDavid Howells 57131143d5dSDavid Howells /* at this point we hold neither mapping->tree_lock nor lock on 57231143d5dSDavid Howells * the page itself: the page may be truncated or invalidated 57331143d5dSDavid Howells * (changing page->mapping to NULL), or even swizzled back from 57431143d5dSDavid Howells * swapper_space to tmpfs file mapping 57531143d5dSDavid Howells */ 5764343d008SDavid Howells ret = lock_page_killable(page); 5774343d008SDavid Howells if (ret < 0) { 5784343d008SDavid Howells put_page(page); 5794343d008SDavid Howells _leave(" = %d", ret); 5804343d008SDavid Howells return ret; 5814343d008SDavid Howells } 58231143d5dSDavid Howells 583c5051c7bSDavid Howells if (page->mapping != mapping || !PageDirty(page)) { 58431143d5dSDavid Howells unlock_page(page); 58509cbfeafSKirill A. Shutemov put_page(page); 58631143d5dSDavid Howells continue; 58731143d5dSDavid Howells } 58831143d5dSDavid Howells 589c5051c7bSDavid Howells if (PageWriteback(page)) { 590c5051c7bSDavid Howells unlock_page(page); 59131143d5dSDavid Howells if (wbc->sync_mode != WB_SYNC_NONE) 59231143d5dSDavid Howells wait_on_page_writeback(page); 59329c8bbbdSDavid Howells put_page(page); 59431143d5dSDavid Howells continue; 59531143d5dSDavid Howells } 59631143d5dSDavid Howells 59765a15109SDavid Howells if (!clear_page_dirty_for_io(page)) 59865a15109SDavid Howells BUG(); 5994343d008SDavid Howells ret = afs_write_back_from_locked_page(mapping, wbc, page, end); 60009cbfeafSKirill A. Shutemov put_page(page); 60131143d5dSDavid Howells if (ret < 0) { 60231143d5dSDavid Howells _leave(" = %d", ret); 60331143d5dSDavid Howells return ret; 60431143d5dSDavid Howells } 60531143d5dSDavid Howells 60631143d5dSDavid Howells wbc->nr_to_write -= ret; 60731143d5dSDavid Howells 60831143d5dSDavid Howells cond_resched(); 60931143d5dSDavid Howells } while (index < end && wbc->nr_to_write > 0); 61031143d5dSDavid Howells 61131143d5dSDavid Howells *_next = index; 61231143d5dSDavid Howells _leave(" = 0 [%lx]", *_next); 61331143d5dSDavid Howells return 0; 61431143d5dSDavid Howells } 61531143d5dSDavid Howells 61631143d5dSDavid Howells /* 61731143d5dSDavid Howells * write some of the pending data back to the server 61831143d5dSDavid Howells */ 61931143d5dSDavid Howells int afs_writepages(struct address_space *mapping, 62031143d5dSDavid Howells struct writeback_control *wbc) 62131143d5dSDavid Howells { 62231143d5dSDavid Howells pgoff_t start, end, next; 62331143d5dSDavid Howells int ret; 62431143d5dSDavid Howells 62531143d5dSDavid Howells _enter(""); 62631143d5dSDavid Howells 62731143d5dSDavid Howells if (wbc->range_cyclic) { 62831143d5dSDavid Howells start = mapping->writeback_index; 62931143d5dSDavid Howells end = -1; 63031143d5dSDavid Howells ret = afs_writepages_region(mapping, wbc, start, end, &next); 6311b430beeSWu Fengguang if (start > 0 && wbc->nr_to_write > 0 && ret == 0) 63231143d5dSDavid Howells ret = afs_writepages_region(mapping, wbc, 0, start, 63331143d5dSDavid Howells &next); 63431143d5dSDavid Howells mapping->writeback_index = next; 63531143d5dSDavid Howells } else if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) { 63609cbfeafSKirill A. Shutemov end = (pgoff_t)(LLONG_MAX >> PAGE_SHIFT); 63731143d5dSDavid Howells ret = afs_writepages_region(mapping, wbc, 0, end, &next); 63831143d5dSDavid Howells if (wbc->nr_to_write > 0) 63931143d5dSDavid Howells mapping->writeback_index = next; 64031143d5dSDavid Howells } else { 64109cbfeafSKirill A. Shutemov start = wbc->range_start >> PAGE_SHIFT; 64209cbfeafSKirill A. Shutemov end = wbc->range_end >> PAGE_SHIFT; 64331143d5dSDavid Howells ret = afs_writepages_region(mapping, wbc, start, end, &next); 64431143d5dSDavid Howells } 64531143d5dSDavid Howells 64631143d5dSDavid Howells _leave(" = %d", ret); 64731143d5dSDavid Howells return ret; 64831143d5dSDavid Howells } 64931143d5dSDavid Howells 65031143d5dSDavid Howells /* 65131143d5dSDavid Howells * completion of write to server 65231143d5dSDavid Howells */ 65331143d5dSDavid Howells void afs_pages_written_back(struct afs_vnode *vnode, struct afs_call *call) 65431143d5dSDavid Howells { 65531143d5dSDavid Howells struct pagevec pv; 65613524ab3SDavid Howells unsigned long priv; 65731143d5dSDavid Howells unsigned count, loop; 65831143d5dSDavid Howells pgoff_t first = call->first, last = call->last; 65931143d5dSDavid Howells 66031143d5dSDavid Howells _enter("{%x:%u},{%lx-%lx}", 66131143d5dSDavid Howells vnode->fid.vid, vnode->fid.vnode, first, last); 66231143d5dSDavid Howells 66386679820SMel Gorman pagevec_init(&pv); 66431143d5dSDavid Howells 66531143d5dSDavid Howells do { 6665bbf5d39SDavid Howells _debug("done %lx-%lx", first, last); 66731143d5dSDavid Howells 66831143d5dSDavid Howells count = last - first + 1; 66931143d5dSDavid Howells if (count > PAGEVEC_SIZE) 67031143d5dSDavid Howells count = PAGEVEC_SIZE; 6714343d008SDavid Howells pv.nr = find_get_pages_contig(vnode->vfs_inode.i_mapping, 6724343d008SDavid Howells first, count, pv.pages); 67331143d5dSDavid Howells ASSERTCMP(pv.nr, ==, count); 67431143d5dSDavid Howells 67531143d5dSDavid Howells for (loop = 0; loop < count; loop++) { 67613524ab3SDavid Howells priv = page_private(pv.pages[loop]); 67713524ab3SDavid Howells trace_afs_page_dirty(vnode, tracepoint_string("clear"), 67813524ab3SDavid Howells pv.pages[loop]->index, priv); 6794343d008SDavid Howells set_page_private(pv.pages[loop], 0); 6804343d008SDavid Howells end_page_writeback(pv.pages[loop]); 68131143d5dSDavid Howells } 68231143d5dSDavid Howells first += count; 68331143d5dSDavid Howells __pagevec_release(&pv); 6845bbf5d39SDavid Howells } while (first <= last); 68531143d5dSDavid Howells 6864343d008SDavid Howells afs_prune_wb_keys(vnode); 68731143d5dSDavid Howells _leave(""); 68831143d5dSDavid Howells } 68931143d5dSDavid Howells 69031143d5dSDavid Howells /* 69131143d5dSDavid Howells * write to an AFS file 69231143d5dSDavid Howells */ 69350b5551dSAl Viro ssize_t afs_file_write(struct kiocb *iocb, struct iov_iter *from) 69431143d5dSDavid Howells { 695496ad9aaSAl Viro struct afs_vnode *vnode = AFS_FS_I(file_inode(iocb->ki_filp)); 69631143d5dSDavid Howells ssize_t result; 69750b5551dSAl Viro size_t count = iov_iter_count(from); 69831143d5dSDavid Howells 69950b5551dSAl Viro _enter("{%x.%u},{%zu},", 70050b5551dSAl Viro vnode->fid.vid, vnode->fid.vnode, count); 70131143d5dSDavid Howells 70231143d5dSDavid Howells if (IS_SWAPFILE(&vnode->vfs_inode)) { 70331143d5dSDavid Howells printk(KERN_INFO 70431143d5dSDavid Howells "AFS: Attempt to write to active swap file!\n"); 70531143d5dSDavid Howells return -EBUSY; 70631143d5dSDavid Howells } 70731143d5dSDavid Howells 70831143d5dSDavid Howells if (!count) 70931143d5dSDavid Howells return 0; 71031143d5dSDavid Howells 71150b5551dSAl Viro result = generic_file_write_iter(iocb, from); 71231143d5dSDavid Howells 71331143d5dSDavid Howells _leave(" = %zd", result); 71431143d5dSDavid Howells return result; 71531143d5dSDavid Howells } 71631143d5dSDavid Howells 71731143d5dSDavid Howells /* 71831143d5dSDavid Howells * flush any dirty pages for this process, and check for write errors. 71931143d5dSDavid Howells * - the return status from this call provides a reliable indication of 72031143d5dSDavid Howells * whether any write errors occurred for this process. 72131143d5dSDavid Howells */ 72202c24a82SJosef Bacik int afs_fsync(struct file *file, loff_t start, loff_t end, int datasync) 72331143d5dSDavid Howells { 7243c981bfcSAl Viro struct inode *inode = file_inode(file); 7253c981bfcSAl Viro struct afs_vnode *vnode = AFS_FS_I(inode); 72631143d5dSDavid Howells 7273c981bfcSAl Viro _enter("{%x:%u},{n=%pD},%d", 7283c981bfcSAl Viro vnode->fid.vid, vnode->fid.vnode, file, 72931143d5dSDavid Howells datasync); 73031143d5dSDavid Howells 7314343d008SDavid Howells return file_write_and_wait_range(file, start, end); 73231143d5dSDavid Howells } 7339b3f26c9SDavid Howells 7349b3f26c9SDavid Howells /* 73558fed94dSDavid Howells * Flush out all outstanding writes on a file opened for writing when it is 73658fed94dSDavid Howells * closed. 73758fed94dSDavid Howells */ 73858fed94dSDavid Howells int afs_flush(struct file *file, fl_owner_t id) 73958fed94dSDavid Howells { 74058fed94dSDavid Howells _enter(""); 74158fed94dSDavid Howells 74258fed94dSDavid Howells if ((file->f_mode & FMODE_WRITE) == 0) 74358fed94dSDavid Howells return 0; 74458fed94dSDavid Howells 74558fed94dSDavid Howells return vfs_fsync(file, 0); 74658fed94dSDavid Howells } 74758fed94dSDavid Howells 74858fed94dSDavid Howells /* 7499b3f26c9SDavid Howells * notification that a previously read-only page is about to become writable 7509b3f26c9SDavid Howells * - if it returns an error, the caller will deliver a bus error signal 7519b3f26c9SDavid Howells */ 7521cf7a151SDavid Howells int afs_page_mkwrite(struct vm_fault *vmf) 7539b3f26c9SDavid Howells { 7541cf7a151SDavid Howells struct file *file = vmf->vma->vm_file; 7551cf7a151SDavid Howells struct inode *inode = file_inode(file); 7561cf7a151SDavid Howells struct afs_vnode *vnode = AFS_FS_I(inode); 7571cf7a151SDavid Howells unsigned long priv; 7589b3f26c9SDavid Howells 7599b3f26c9SDavid Howells _enter("{{%x:%u}},{%lx}", 7601cf7a151SDavid Howells vnode->fid.vid, vnode->fid.vnode, vmf->page->index); 7619b3f26c9SDavid Howells 7621cf7a151SDavid Howells sb_start_pagefault(inode->i_sb); 7631cf7a151SDavid Howells 7641cf7a151SDavid Howells /* Wait for the page to be written to the cache before we allow it to 7651cf7a151SDavid Howells * be modified. We then assume the entire page will need writing back. 7661cf7a151SDavid Howells */ 7679b3f26c9SDavid Howells #ifdef CONFIG_AFS_FSCACHE 7681cf7a151SDavid Howells fscache_wait_on_page_write(vnode->cache, vmf->page); 7699b3f26c9SDavid Howells #endif 7709b3f26c9SDavid Howells 7711cf7a151SDavid Howells if (PageWriteback(vmf->page) && 7721cf7a151SDavid Howells wait_on_page_bit_killable(vmf->page, PG_writeback) < 0) 7731cf7a151SDavid Howells return VM_FAULT_RETRY; 7741cf7a151SDavid Howells 7751cf7a151SDavid Howells if (lock_page_killable(vmf->page) < 0) 7761cf7a151SDavid Howells return VM_FAULT_RETRY; 7771cf7a151SDavid Howells 7781cf7a151SDavid Howells /* We mustn't change page->private until writeback is complete as that 7791cf7a151SDavid Howells * details the portion of the page we need to write back and we might 7801cf7a151SDavid Howells * need to redirty the page if there's a problem. 7811cf7a151SDavid Howells */ 7821cf7a151SDavid Howells wait_on_page_writeback(vmf->page); 7831cf7a151SDavid Howells 7841cf7a151SDavid Howells priv = (unsigned long)PAGE_SIZE << AFS_PRIV_SHIFT; /* To */ 7851cf7a151SDavid Howells priv |= 0; /* From */ 78613524ab3SDavid Howells trace_afs_page_dirty(vnode, tracepoint_string("mkwrite"), 78713524ab3SDavid Howells vmf->page->index, priv); 7881cf7a151SDavid Howells SetPagePrivate(vmf->page); 7891cf7a151SDavid Howells set_page_private(vmf->page, priv); 7901cf7a151SDavid Howells 7911cf7a151SDavid Howells sb_end_pagefault(inode->i_sb); 7921cf7a151SDavid Howells return VM_FAULT_LOCKED; 7939b3f26c9SDavid Howells } 7944343d008SDavid Howells 7954343d008SDavid Howells /* 7964343d008SDavid Howells * Prune the keys cached for writeback. The caller must hold vnode->wb_lock. 7974343d008SDavid Howells */ 7984343d008SDavid Howells void afs_prune_wb_keys(struct afs_vnode *vnode) 7994343d008SDavid Howells { 8004343d008SDavid Howells LIST_HEAD(graveyard); 8014343d008SDavid Howells struct afs_wb_key *wbk, *tmp; 8024343d008SDavid Howells 8034343d008SDavid Howells /* Discard unused keys */ 8044343d008SDavid Howells spin_lock(&vnode->wb_lock); 8054343d008SDavid Howells 8064343d008SDavid Howells if (!mapping_tagged(&vnode->vfs_inode.i_data, PAGECACHE_TAG_WRITEBACK) && 8074343d008SDavid Howells !mapping_tagged(&vnode->vfs_inode.i_data, PAGECACHE_TAG_DIRTY)) { 8084343d008SDavid Howells list_for_each_entry_safe(wbk, tmp, &vnode->wb_keys, vnode_link) { 8094343d008SDavid Howells if (refcount_read(&wbk->usage) == 1) 8104343d008SDavid Howells list_move(&wbk->vnode_link, &graveyard); 8114343d008SDavid Howells } 8124343d008SDavid Howells } 8134343d008SDavid Howells 8144343d008SDavid Howells spin_unlock(&vnode->wb_lock); 8154343d008SDavid Howells 8164343d008SDavid Howells while (!list_empty(&graveyard)) { 8174343d008SDavid Howells wbk = list_entry(graveyard.next, struct afs_wb_key, vnode_link); 8184343d008SDavid Howells list_del(&wbk->vnode_link); 8194343d008SDavid Howells afs_put_wb_key(wbk); 8204343d008SDavid Howells } 8214343d008SDavid Howells } 8224343d008SDavid Howells 8234343d008SDavid Howells /* 8244343d008SDavid Howells * Clean up a page during invalidation. 8254343d008SDavid Howells */ 8264343d008SDavid Howells int afs_launder_page(struct page *page) 8274343d008SDavid Howells { 8284343d008SDavid Howells struct address_space *mapping = page->mapping; 8294343d008SDavid Howells struct afs_vnode *vnode = AFS_FS_I(mapping->host); 8304343d008SDavid Howells unsigned long priv; 8314343d008SDavid Howells unsigned int f, t; 8324343d008SDavid Howells int ret = 0; 8334343d008SDavid Howells 8344343d008SDavid Howells _enter("{%lx}", page->index); 8354343d008SDavid Howells 8364343d008SDavid Howells priv = page_private(page); 8374343d008SDavid Howells if (clear_page_dirty_for_io(page)) { 8384343d008SDavid Howells f = 0; 8394343d008SDavid Howells t = PAGE_SIZE; 8404343d008SDavid Howells if (PagePrivate(page)) { 8414343d008SDavid Howells f = priv & AFS_PRIV_MAX; 8424343d008SDavid Howells t = priv >> AFS_PRIV_SHIFT; 8434343d008SDavid Howells } 8444343d008SDavid Howells 84513524ab3SDavid Howells trace_afs_page_dirty(vnode, tracepoint_string("launder"), 84613524ab3SDavid Howells page->index, priv); 8474343d008SDavid Howells ret = afs_store_data(mapping, page->index, page->index, t, f); 8484343d008SDavid Howells } 8494343d008SDavid Howells 85013524ab3SDavid Howells trace_afs_page_dirty(vnode, tracepoint_string("laundered"), 85113524ab3SDavid Howells page->index, priv); 8524343d008SDavid Howells set_page_private(page, 0); 8534343d008SDavid Howells ClearPagePrivate(page); 8544343d008SDavid Howells 8554343d008SDavid Howells #ifdef CONFIG_AFS_FSCACHE 8564343d008SDavid Howells if (PageFsCache(page)) { 8574343d008SDavid Howells fscache_wait_on_page_write(vnode->cache, page); 8584343d008SDavid Howells fscache_uncache_page(vnode->cache, page); 8594343d008SDavid Howells } 8604343d008SDavid Howells #endif 8614343d008SDavid Howells return ret; 86231143d5dSDavid Howells } 863