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; 362a0b4f64SDavid Howells size_t p; 372a0b4f64SDavid Howells void *data; 3831143d5dSDavid Howells int ret; 3931143d5dSDavid Howells 405e7f2337SAnton Blanchard _enter(",,%llu", (unsigned long long)pos); 4131143d5dSDavid Howells 422a0b4f64SDavid Howells if (pos >= vnode->vfs_inode.i_size) { 432a0b4f64SDavid Howells p = pos & ~PAGE_MASK; 442a0b4f64SDavid Howells ASSERTCMP(p + len, <=, PAGE_SIZE); 452a0b4f64SDavid Howells data = kmap(page); 462a0b4f64SDavid Howells memset(data + p, 0, len); 472a0b4f64SDavid Howells kunmap(page); 482a0b4f64SDavid Howells return 0; 492a0b4f64SDavid Howells } 502a0b4f64SDavid Howells 51196ee9cdSDavid Howells req = kzalloc(sizeof(struct afs_read) + sizeof(struct page *), 52196ee9cdSDavid Howells GFP_KERNEL); 53196ee9cdSDavid Howells if (!req) 54196ee9cdSDavid Howells return -ENOMEM; 55196ee9cdSDavid Howells 56f3ddee8dSDavid Howells refcount_set(&req->usage, 1); 57196ee9cdSDavid Howells req->pos = pos; 58e8e581a8SDavid Howells req->len = len; 59196ee9cdSDavid Howells req->nr_pages = 1; 60f3ddee8dSDavid Howells req->pages = req->array; 61196ee9cdSDavid Howells req->pages[0] = page; 625611ef28SDavid Howells get_page(page); 63196ee9cdSDavid Howells 64d2ddc776SDavid Howells ret = afs_fetch_data(vnode, key, req); 65196ee9cdSDavid Howells afs_put_read(req); 6631143d5dSDavid Howells if (ret < 0) { 6731143d5dSDavid Howells if (ret == -ENOENT) { 6831143d5dSDavid Howells _debug("got NOENT from server" 6931143d5dSDavid Howells " - marking file deleted and stale"); 7031143d5dSDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 7131143d5dSDavid Howells ret = -ESTALE; 7231143d5dSDavid Howells } 7331143d5dSDavid Howells } 7431143d5dSDavid Howells 7531143d5dSDavid Howells _leave(" = %d", ret); 7631143d5dSDavid Howells return ret; 7731143d5dSDavid Howells } 7831143d5dSDavid Howells 7931143d5dSDavid Howells /* 8031143d5dSDavid Howells * prepare to perform part of a write to a page 8131143d5dSDavid Howells */ 8215b4650eSNick Piggin int afs_write_begin(struct file *file, struct address_space *mapping, 8315b4650eSNick Piggin loff_t pos, unsigned len, unsigned flags, 8415b4650eSNick Piggin struct page **pagep, void **fsdata) 8531143d5dSDavid Howells { 86496ad9aaSAl Viro struct afs_vnode *vnode = AFS_FS_I(file_inode(file)); 8715b4650eSNick Piggin struct page *page; 88215804a9SDavid Howells struct key *key = afs_file_key(file); 894343d008SDavid Howells unsigned long priv; 904343d008SDavid Howells unsigned f, from = pos & (PAGE_SIZE - 1); 914343d008SDavid Howells unsigned t, to = from + len; 9209cbfeafSKirill A. Shutemov pgoff_t index = pos >> PAGE_SHIFT; 9331143d5dSDavid Howells int ret; 9431143d5dSDavid Howells 953b6492dfSDavid Howells _enter("{%llx:%llu},{%lx},%u,%u", 9615b4650eSNick Piggin vnode->fid.vid, vnode->fid.vnode, index, from, to); 9731143d5dSDavid Howells 984343d008SDavid Howells /* We want to store information about how much of a page is altered in 994343d008SDavid Howells * page->private. 1004343d008SDavid Howells */ 1014343d008SDavid Howells BUILD_BUG_ON(PAGE_SIZE > 32768 && sizeof(page->private) < 8); 10231143d5dSDavid Howells 10354566b2cSNick Piggin page = grab_cache_page_write_begin(mapping, index, flags); 1044343d008SDavid Howells if (!page) 10515b4650eSNick Piggin return -ENOMEM; 10615b4650eSNick Piggin 10709cbfeafSKirill A. Shutemov if (!PageUptodate(page) && len != PAGE_SIZE) { 108e8e581a8SDavid Howells ret = afs_fill_page(vnode, key, pos & PAGE_MASK, PAGE_SIZE, page); 10931143d5dSDavid Howells if (ret < 0) { 1106d06b0d2SDavid Howells unlock_page(page); 1116d06b0d2SDavid Howells put_page(page); 11231143d5dSDavid Howells _leave(" = %d [prep]", ret); 11331143d5dSDavid Howells return ret; 11431143d5dSDavid Howells } 11515b4650eSNick Piggin SetPageUptodate(page); 11631143d5dSDavid Howells } 11731143d5dSDavid Howells 1186d06b0d2SDavid Howells /* page won't leak in error case: it eventually gets cleaned off LRU */ 1196d06b0d2SDavid Howells *pagep = page; 1206d06b0d2SDavid Howells 12131143d5dSDavid Howells try_again: 1224343d008SDavid Howells /* See if this page is already partially written in a way that we can 1234343d008SDavid Howells * merge the new write with. 1244343d008SDavid Howells */ 1254343d008SDavid Howells t = f = 0; 1264343d008SDavid Howells if (PagePrivate(page)) { 1274343d008SDavid Howells priv = page_private(page); 1284343d008SDavid Howells f = priv & AFS_PRIV_MAX; 1294343d008SDavid Howells t = priv >> AFS_PRIV_SHIFT; 1304343d008SDavid Howells ASSERTCMP(f, <=, t); 13131143d5dSDavid Howells } 13231143d5dSDavid Howells 1334343d008SDavid Howells if (f != t) { 1345a039c32SDavid Howells if (PageWriteback(page)) { 1355a039c32SDavid Howells trace_afs_page_dirty(vnode, tracepoint_string("alrdy"), 1365a039c32SDavid Howells page->index, priv); 1375a039c32SDavid Howells goto flush_conflicting_write; 1385a039c32SDavid Howells } 1395a813276SDavid Howells /* If the file is being filled locally, allow inter-write 1405a813276SDavid Howells * spaces to be merged into writes. If it's not, only write 1415a813276SDavid Howells * back what the user gives us. 1425a813276SDavid Howells */ 1435a813276SDavid Howells if (!test_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags) && 1445a813276SDavid Howells (to < f || from > t)) 1454343d008SDavid Howells goto flush_conflicting_write; 1464343d008SDavid Howells if (from < f) 1474343d008SDavid Howells f = from; 1484343d008SDavid Howells if (to > t) 1494343d008SDavid Howells t = to; 1504343d008SDavid Howells } else { 1514343d008SDavid Howells f = from; 1524343d008SDavid Howells t = to; 15331143d5dSDavid Howells } 15431143d5dSDavid Howells 1554343d008SDavid Howells priv = (unsigned long)t << AFS_PRIV_SHIFT; 1564343d008SDavid Howells priv |= f; 15713524ab3SDavid Howells trace_afs_page_dirty(vnode, tracepoint_string("begin"), 15813524ab3SDavid Howells page->index, priv); 15931143d5dSDavid Howells SetPagePrivate(page); 1604343d008SDavid Howells set_page_private(page, priv); 1614343d008SDavid Howells _leave(" = 0"); 16231143d5dSDavid Howells return 0; 16331143d5dSDavid Howells 1644343d008SDavid Howells /* The previous write and this write aren't adjacent or overlapping, so 1654343d008SDavid Howells * flush the page out. 1664343d008SDavid Howells */ 1674343d008SDavid Howells flush_conflicting_write: 16831143d5dSDavid Howells _debug("flush conflict"); 1694343d008SDavid Howells ret = write_one_page(page); 17031143d5dSDavid Howells if (ret < 0) { 17131143d5dSDavid Howells _leave(" = %d", ret); 17231143d5dSDavid Howells return ret; 17331143d5dSDavid Howells } 17431143d5dSDavid Howells 1754343d008SDavid Howells ret = lock_page_killable(page); 1764343d008SDavid Howells if (ret < 0) { 1774343d008SDavid Howells _leave(" = %d", ret); 1784343d008SDavid Howells return ret; 1794343d008SDavid Howells } 18031143d5dSDavid Howells goto try_again; 18131143d5dSDavid Howells } 18231143d5dSDavid Howells 18331143d5dSDavid Howells /* 18431143d5dSDavid Howells * finalise part of a write to a page 18531143d5dSDavid Howells */ 18615b4650eSNick Piggin int afs_write_end(struct file *file, struct address_space *mapping, 18715b4650eSNick Piggin loff_t pos, unsigned len, unsigned copied, 18815b4650eSNick Piggin struct page *page, void *fsdata) 18931143d5dSDavid Howells { 190496ad9aaSAl Viro struct afs_vnode *vnode = AFS_FS_I(file_inode(file)); 191215804a9SDavid Howells struct key *key = afs_file_key(file); 19231143d5dSDavid Howells loff_t i_size, maybe_i_size; 193e8e581a8SDavid Howells int ret; 19431143d5dSDavid Howells 1953b6492dfSDavid Howells _enter("{%llx:%llu},{%lx}", 19615b4650eSNick Piggin vnode->fid.vid, vnode->fid.vnode, page->index); 19731143d5dSDavid Howells 19815b4650eSNick Piggin maybe_i_size = pos + copied; 19931143d5dSDavid Howells 20031143d5dSDavid Howells i_size = i_size_read(&vnode->vfs_inode); 20131143d5dSDavid Howells if (maybe_i_size > i_size) { 2024343d008SDavid Howells spin_lock(&vnode->wb_lock); 20331143d5dSDavid Howells i_size = i_size_read(&vnode->vfs_inode); 20431143d5dSDavid Howells if (maybe_i_size > i_size) 20531143d5dSDavid Howells i_size_write(&vnode->vfs_inode, maybe_i_size); 2064343d008SDavid Howells spin_unlock(&vnode->wb_lock); 20731143d5dSDavid Howells } 20831143d5dSDavid Howells 209e8e581a8SDavid Howells if (!PageUptodate(page)) { 210e8e581a8SDavid Howells if (copied < len) { 211e8e581a8SDavid Howells /* Try and load any missing data from the server. The 212e8e581a8SDavid Howells * unmarshalling routine will take care of clearing any 213e8e581a8SDavid Howells * bits that are beyond the EOF. 214e8e581a8SDavid Howells */ 215e8e581a8SDavid Howells ret = afs_fill_page(vnode, key, pos + copied, 216e8e581a8SDavid Howells len - copied, page); 217e8e581a8SDavid Howells if (ret < 0) 218afae457dSDavid Howells goto out; 219e8e581a8SDavid Howells } 220e8e581a8SDavid Howells SetPageUptodate(page); 221e8e581a8SDavid Howells } 222e8e581a8SDavid Howells 22331143d5dSDavid Howells set_page_dirty(page); 22431143d5dSDavid Howells if (PageDirty(page)) 22531143d5dSDavid Howells _debug("dirtied"); 226afae457dSDavid Howells ret = copied; 227afae457dSDavid Howells 228afae457dSDavid Howells out: 22915b4650eSNick Piggin unlock_page(page); 23009cbfeafSKirill A. Shutemov put_page(page); 231afae457dSDavid Howells return ret; 23231143d5dSDavid Howells } 23331143d5dSDavid Howells 23431143d5dSDavid Howells /* 23531143d5dSDavid Howells * kill all the pages in the given range 23631143d5dSDavid Howells */ 2374343d008SDavid Howells static void afs_kill_pages(struct address_space *mapping, 23831143d5dSDavid Howells pgoff_t first, pgoff_t last) 23931143d5dSDavid Howells { 2404343d008SDavid Howells struct afs_vnode *vnode = AFS_FS_I(mapping->host); 24131143d5dSDavid Howells struct pagevec pv; 24231143d5dSDavid Howells unsigned count, loop; 24331143d5dSDavid Howells 2443b6492dfSDavid Howells _enter("{%llx:%llu},%lx-%lx", 24531143d5dSDavid Howells vnode->fid.vid, vnode->fid.vnode, first, last); 24631143d5dSDavid Howells 24786679820SMel Gorman pagevec_init(&pv); 24831143d5dSDavid Howells 24931143d5dSDavid Howells do { 25031143d5dSDavid Howells _debug("kill %lx-%lx", first, last); 25131143d5dSDavid Howells 25231143d5dSDavid Howells count = last - first + 1; 25331143d5dSDavid Howells if (count > PAGEVEC_SIZE) 25431143d5dSDavid Howells count = PAGEVEC_SIZE; 2554343d008SDavid Howells pv.nr = find_get_pages_contig(mapping, first, count, pv.pages); 25631143d5dSDavid Howells ASSERTCMP(pv.nr, ==, count); 25731143d5dSDavid Howells 25831143d5dSDavid Howells for (loop = 0; loop < count; loop++) { 2597286a35eSDavid Howells struct page *page = pv.pages[loop]; 2607286a35eSDavid Howells ClearPageUptodate(page); 2617286a35eSDavid Howells SetPageError(page); 2624343d008SDavid Howells end_page_writeback(page); 2634343d008SDavid Howells if (page->index >= first) 2644343d008SDavid Howells first = page->index + 1; 2654343d008SDavid Howells lock_page(page); 2664343d008SDavid Howells generic_error_remove_page(mapping, page); 26721bd68f1SMarc Dionne unlock_page(page); 2684343d008SDavid Howells } 2694343d008SDavid Howells 2704343d008SDavid Howells __pagevec_release(&pv); 2714343d008SDavid Howells } while (first <= last); 2724343d008SDavid Howells 2734343d008SDavid Howells _leave(""); 2744343d008SDavid Howells } 2754343d008SDavid Howells 2764343d008SDavid Howells /* 2774343d008SDavid Howells * Redirty all the pages in a given range. 2784343d008SDavid Howells */ 2794343d008SDavid Howells static void afs_redirty_pages(struct writeback_control *wbc, 2804343d008SDavid Howells struct address_space *mapping, 2814343d008SDavid Howells pgoff_t first, pgoff_t last) 2824343d008SDavid Howells { 2834343d008SDavid Howells struct afs_vnode *vnode = AFS_FS_I(mapping->host); 2844343d008SDavid Howells struct pagevec pv; 2854343d008SDavid Howells unsigned count, loop; 2864343d008SDavid Howells 2873b6492dfSDavid Howells _enter("{%llx:%llu},%lx-%lx", 2884343d008SDavid Howells vnode->fid.vid, vnode->fid.vnode, first, last); 2894343d008SDavid Howells 290487e2c9fSLinus Torvalds pagevec_init(&pv); 2914343d008SDavid Howells 2924343d008SDavid Howells do { 2934343d008SDavid Howells _debug("redirty %lx-%lx", first, last); 2944343d008SDavid Howells 2954343d008SDavid Howells count = last - first + 1; 2964343d008SDavid Howells if (count > PAGEVEC_SIZE) 2974343d008SDavid Howells count = PAGEVEC_SIZE; 2984343d008SDavid Howells pv.nr = find_get_pages_contig(mapping, first, count, pv.pages); 2994343d008SDavid Howells ASSERTCMP(pv.nr, ==, count); 3004343d008SDavid Howells 3014343d008SDavid Howells for (loop = 0; loop < count; loop++) { 3024343d008SDavid Howells struct page *page = pv.pages[loop]; 3034343d008SDavid Howells 3044343d008SDavid Howells redirty_page_for_writepage(wbc, page); 3057286a35eSDavid Howells end_page_writeback(page); 3067286a35eSDavid Howells if (page->index >= first) 3077286a35eSDavid Howells first = page->index + 1; 30831143d5dSDavid Howells } 30931143d5dSDavid Howells 31031143d5dSDavid Howells __pagevec_release(&pv); 3114343d008SDavid Howells } while (first <= last); 31231143d5dSDavid Howells 31331143d5dSDavid Howells _leave(""); 31431143d5dSDavid Howells } 31531143d5dSDavid Howells 31631143d5dSDavid Howells /* 317d2ddc776SDavid Howells * write to a file 31831143d5dSDavid Howells */ 3194343d008SDavid Howells static int afs_store_data(struct address_space *mapping, 3204343d008SDavid Howells pgoff_t first, pgoff_t last, 321d2ddc776SDavid Howells unsigned offset, unsigned to) 32231143d5dSDavid Howells { 3234343d008SDavid Howells struct afs_vnode *vnode = AFS_FS_I(mapping->host); 324d2ddc776SDavid Howells struct afs_fs_cursor fc; 3254343d008SDavid Howells struct afs_wb_key *wbk = NULL; 3264343d008SDavid Howells struct list_head *p; 3274343d008SDavid Howells int ret = -ENOKEY, ret2; 328d2ddc776SDavid Howells 3293b6492dfSDavid Howells _enter("%s{%llx:%llu.%u},%lx,%lx,%x,%x", 330d2ddc776SDavid Howells vnode->volume->name, 331d2ddc776SDavid Howells vnode->fid.vid, 332d2ddc776SDavid Howells vnode->fid.vnode, 333d2ddc776SDavid Howells vnode->fid.unique, 334d2ddc776SDavid Howells first, last, offset, to); 335d2ddc776SDavid Howells 3364343d008SDavid Howells spin_lock(&vnode->wb_lock); 3374343d008SDavid Howells p = vnode->wb_keys.next; 3384343d008SDavid Howells 3394343d008SDavid Howells /* Iterate through the list looking for a valid key to use. */ 3404343d008SDavid Howells try_next_key: 3414343d008SDavid Howells while (p != &vnode->wb_keys) { 3424343d008SDavid Howells wbk = list_entry(p, struct afs_wb_key, vnode_link); 3434343d008SDavid Howells _debug("wbk %u", key_serial(wbk->key)); 3444343d008SDavid Howells ret2 = key_validate(wbk->key); 3454343d008SDavid Howells if (ret2 == 0) 3464343d008SDavid Howells goto found_key; 3474343d008SDavid Howells if (ret == -ENOKEY) 3484343d008SDavid Howells ret = ret2; 3494343d008SDavid Howells p = p->next; 3504343d008SDavid Howells } 3514343d008SDavid Howells 3524343d008SDavid Howells spin_unlock(&vnode->wb_lock); 3534343d008SDavid Howells afs_put_wb_key(wbk); 3544343d008SDavid Howells _leave(" = %d [no keys]", ret); 3554343d008SDavid Howells return ret; 3564343d008SDavid Howells 3574343d008SDavid Howells found_key: 3584343d008SDavid Howells refcount_inc(&wbk->usage); 3594343d008SDavid Howells spin_unlock(&vnode->wb_lock); 3604343d008SDavid Howells 3614343d008SDavid Howells _debug("USE WB KEY %u", key_serial(wbk->key)); 3624343d008SDavid Howells 363d2ddc776SDavid Howells ret = -ERESTARTSYS; 3644343d008SDavid Howells if (afs_begin_vnode_operation(&fc, vnode, wbk->key)) { 365d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 36668251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(vnode); 3674343d008SDavid Howells afs_fs_store_data(&fc, mapping, first, last, offset, to); 368d2ddc776SDavid Howells } 369d2ddc776SDavid Howells 370d2ddc776SDavid Howells afs_check_for_remote_deletion(&fc, fc.vnode); 371d2ddc776SDavid Howells afs_vnode_commit_status(&fc, vnode, fc.cb_break); 372d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 373d2ddc776SDavid Howells } 374d2ddc776SDavid Howells 3754343d008SDavid Howells switch (ret) { 37676a5cb6fSDavid Howells case 0: 37776a5cb6fSDavid Howells afs_stat_v(vnode, n_stores); 37876a5cb6fSDavid Howells atomic_long_add((last * PAGE_SIZE + to) - 37976a5cb6fSDavid Howells (first * PAGE_SIZE + offset), 38076a5cb6fSDavid Howells &afs_v2net(vnode)->n_store_bytes); 38176a5cb6fSDavid Howells break; 3824343d008SDavid Howells case -EACCES: 3834343d008SDavid Howells case -EPERM: 3844343d008SDavid Howells case -ENOKEY: 3854343d008SDavid Howells case -EKEYEXPIRED: 3864343d008SDavid Howells case -EKEYREJECTED: 3874343d008SDavid Howells case -EKEYREVOKED: 3884343d008SDavid Howells _debug("next"); 3894343d008SDavid Howells spin_lock(&vnode->wb_lock); 3904343d008SDavid Howells p = wbk->vnode_link.next; 3914343d008SDavid Howells afs_put_wb_key(wbk); 3924343d008SDavid Howells goto try_next_key; 3934343d008SDavid Howells } 3944343d008SDavid Howells 3954343d008SDavid Howells afs_put_wb_key(wbk); 396d2ddc776SDavid Howells _leave(" = %d", ret); 397d2ddc776SDavid Howells return ret; 398d2ddc776SDavid Howells } 399d2ddc776SDavid Howells 400d2ddc776SDavid Howells /* 4014343d008SDavid Howells * Synchronously write back the locked page and any subsequent non-locked dirty 4024343d008SDavid Howells * pages. 40331143d5dSDavid Howells */ 4044343d008SDavid Howells static int afs_write_back_from_locked_page(struct address_space *mapping, 4054343d008SDavid Howells struct writeback_control *wbc, 4064343d008SDavid Howells struct page *primary_page, 4074343d008SDavid Howells pgoff_t final_page) 40831143d5dSDavid Howells { 40913524ab3SDavid Howells struct afs_vnode *vnode = AFS_FS_I(mapping->host); 41031143d5dSDavid Howells struct page *pages[8], *page; 4114343d008SDavid Howells unsigned long count, priv; 4124343d008SDavid Howells unsigned n, offset, to, f, t; 41331143d5dSDavid Howells pgoff_t start, first, last; 41431143d5dSDavid Howells int loop, ret; 41531143d5dSDavid Howells 41631143d5dSDavid Howells _enter(",%lx", primary_page->index); 41731143d5dSDavid Howells 41831143d5dSDavid Howells count = 1; 41931143d5dSDavid Howells if (test_set_page_writeback(primary_page)) 42031143d5dSDavid Howells BUG(); 42131143d5dSDavid Howells 4224343d008SDavid Howells /* Find all consecutive lockable dirty pages that have contiguous 4234343d008SDavid Howells * written regions, stopping when we find a page that is not 4244343d008SDavid Howells * immediately lockable, is not dirty or is missing, or we reach the 4254343d008SDavid Howells * end of the range. 4264343d008SDavid Howells */ 42731143d5dSDavid Howells start = primary_page->index; 4284343d008SDavid Howells priv = page_private(primary_page); 4294343d008SDavid Howells offset = priv & AFS_PRIV_MAX; 4304343d008SDavid Howells to = priv >> AFS_PRIV_SHIFT; 43113524ab3SDavid Howells trace_afs_page_dirty(vnode, tracepoint_string("store"), 43213524ab3SDavid Howells primary_page->index, priv); 4334343d008SDavid Howells 4344343d008SDavid Howells WARN_ON(offset == to); 43513524ab3SDavid Howells if (offset == to) 43613524ab3SDavid Howells trace_afs_page_dirty(vnode, tracepoint_string("WARN"), 43713524ab3SDavid Howells primary_page->index, priv); 4384343d008SDavid Howells 4395a813276SDavid Howells if (start >= final_page || 4405a813276SDavid Howells (to < PAGE_SIZE && !test_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags))) 44131143d5dSDavid Howells goto no_more; 4424343d008SDavid Howells 44331143d5dSDavid Howells start++; 44431143d5dSDavid Howells do { 44531143d5dSDavid Howells _debug("more %lx [%lx]", start, count); 4464343d008SDavid Howells n = final_page - start + 1; 44731143d5dSDavid Howells if (n > ARRAY_SIZE(pages)) 44831143d5dSDavid Howells n = ARRAY_SIZE(pages); 4494343d008SDavid Howells n = find_get_pages_contig(mapping, start, ARRAY_SIZE(pages), pages); 45031143d5dSDavid Howells _debug("fgpc %u", n); 45131143d5dSDavid Howells if (n == 0) 45231143d5dSDavid Howells goto no_more; 45331143d5dSDavid Howells if (pages[0]->index != start) { 4549d577b6aSDavid Howells do { 4559d577b6aSDavid Howells put_page(pages[--n]); 4569d577b6aSDavid Howells } while (n > 0); 45731143d5dSDavid Howells goto no_more; 45831143d5dSDavid Howells } 45931143d5dSDavid Howells 46031143d5dSDavid Howells for (loop = 0; loop < n; loop++) { 46131143d5dSDavid Howells page = pages[loop]; 4625a813276SDavid Howells if (to != PAGE_SIZE && 4635a813276SDavid Howells !test_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags)) 4645a813276SDavid Howells break; 4654343d008SDavid Howells if (page->index > final_page) 46631143d5dSDavid Howells break; 467529ae9aaSNick Piggin if (!trylock_page(page)) 46831143d5dSDavid Howells break; 4694343d008SDavid Howells if (!PageDirty(page) || PageWriteback(page)) { 47031143d5dSDavid Howells unlock_page(page); 47131143d5dSDavid Howells break; 47231143d5dSDavid Howells } 4734343d008SDavid Howells 4744343d008SDavid Howells priv = page_private(page); 4754343d008SDavid Howells f = priv & AFS_PRIV_MAX; 4764343d008SDavid Howells t = priv >> AFS_PRIV_SHIFT; 4775a813276SDavid Howells if (f != 0 && 4785a813276SDavid Howells !test_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags)) { 4794343d008SDavid Howells unlock_page(page); 4804343d008SDavid Howells break; 4814343d008SDavid Howells } 4824343d008SDavid Howells to = t; 4834343d008SDavid Howells 48413524ab3SDavid Howells trace_afs_page_dirty(vnode, tracepoint_string("store+"), 48513524ab3SDavid Howells page->index, priv); 48613524ab3SDavid Howells 48731143d5dSDavid Howells if (!clear_page_dirty_for_io(page)) 48831143d5dSDavid Howells BUG(); 48931143d5dSDavid Howells if (test_set_page_writeback(page)) 49031143d5dSDavid Howells BUG(); 49131143d5dSDavid Howells unlock_page(page); 49231143d5dSDavid Howells put_page(page); 49331143d5dSDavid Howells } 49431143d5dSDavid Howells count += loop; 49531143d5dSDavid Howells if (loop < n) { 49631143d5dSDavid Howells for (; loop < n; loop++) 49731143d5dSDavid Howells put_page(pages[loop]); 49831143d5dSDavid Howells goto no_more; 49931143d5dSDavid Howells } 50031143d5dSDavid Howells 50131143d5dSDavid Howells start += loop; 5024343d008SDavid Howells } while (start <= final_page && count < 65536); 50331143d5dSDavid Howells 50431143d5dSDavid Howells no_more: 5054343d008SDavid Howells /* We now have a contiguous set of dirty pages, each with writeback 5064343d008SDavid Howells * set; the first page is still locked at this point, but all the rest 5074343d008SDavid Howells * have been unlocked. 5084343d008SDavid Howells */ 5094343d008SDavid Howells unlock_page(primary_page); 5104343d008SDavid Howells 51131143d5dSDavid Howells first = primary_page->index; 51231143d5dSDavid Howells last = first + count - 1; 51331143d5dSDavid Howells 51431143d5dSDavid Howells _debug("write back %lx[%u..] to %lx[..%u]", first, offset, last, to); 51531143d5dSDavid Howells 5164343d008SDavid Howells ret = afs_store_data(mapping, first, last, offset, to); 51731143d5dSDavid Howells switch (ret) { 5184343d008SDavid Howells case 0: 5194343d008SDavid Howells ret = count; 5204343d008SDavid Howells break; 5214343d008SDavid Howells 5224343d008SDavid Howells default: 5234343d008SDavid Howells pr_notice("kAFS: Unexpected error from FS.StoreData %d\n", ret); 5244343d008SDavid Howells /* Fall through */ 5254343d008SDavid Howells case -EACCES: 5264343d008SDavid Howells case -EPERM: 5274343d008SDavid Howells case -ENOKEY: 5284343d008SDavid Howells case -EKEYEXPIRED: 5294343d008SDavid Howells case -EKEYREJECTED: 5304343d008SDavid Howells case -EKEYREVOKED: 5314343d008SDavid Howells afs_redirty_pages(wbc, mapping, first, last); 5324343d008SDavid Howells mapping_set_error(mapping, ret); 5334343d008SDavid Howells break; 5344343d008SDavid Howells 53531143d5dSDavid Howells case -EDQUOT: 53631143d5dSDavid Howells case -ENOSPC: 5374343d008SDavid Howells afs_redirty_pages(wbc, mapping, first, last); 5384343d008SDavid Howells mapping_set_error(mapping, -ENOSPC); 53931143d5dSDavid Howells break; 5404343d008SDavid Howells 54131143d5dSDavid Howells case -EROFS: 54231143d5dSDavid Howells case -EIO: 54331143d5dSDavid Howells case -EREMOTEIO: 54431143d5dSDavid Howells case -EFBIG: 54531143d5dSDavid Howells case -ENOENT: 54631143d5dSDavid Howells case -ENOMEDIUM: 54731143d5dSDavid Howells case -ENXIO: 548f51375cdSDavid Howells trace_afs_file_error(vnode, ret, afs_file_error_writeback_fail); 5494343d008SDavid Howells afs_kill_pages(mapping, first, last); 5504343d008SDavid Howells mapping_set_error(mapping, ret); 55131143d5dSDavid Howells break; 55231143d5dSDavid Howells } 55331143d5dSDavid Howells 55431143d5dSDavid Howells _leave(" = %d", ret); 55531143d5dSDavid Howells return ret; 55631143d5dSDavid Howells } 55731143d5dSDavid Howells 55831143d5dSDavid Howells /* 55931143d5dSDavid Howells * write a page back to the server 56031143d5dSDavid Howells * - the caller locked the page for us 56131143d5dSDavid Howells */ 56231143d5dSDavid Howells int afs_writepage(struct page *page, struct writeback_control *wbc) 56331143d5dSDavid Howells { 56431143d5dSDavid Howells int ret; 56531143d5dSDavid Howells 56631143d5dSDavid Howells _enter("{%lx},", page->index); 56731143d5dSDavid Howells 5684343d008SDavid Howells ret = afs_write_back_from_locked_page(page->mapping, wbc, page, 5694343d008SDavid Howells wbc->range_end >> PAGE_SHIFT); 57031143d5dSDavid Howells if (ret < 0) { 57131143d5dSDavid Howells _leave(" = %d", ret); 57231143d5dSDavid Howells return 0; 57331143d5dSDavid Howells } 57431143d5dSDavid Howells 57531143d5dSDavid Howells wbc->nr_to_write -= ret; 57631143d5dSDavid Howells 57731143d5dSDavid Howells _leave(" = 0"); 57831143d5dSDavid Howells return 0; 57931143d5dSDavid Howells } 58031143d5dSDavid Howells 58131143d5dSDavid Howells /* 58231143d5dSDavid Howells * write a region of pages back to the server 58331143d5dSDavid Howells */ 584c1206a2cSAdrian Bunk static int afs_writepages_region(struct address_space *mapping, 58531143d5dSDavid Howells struct writeback_control *wbc, 58631143d5dSDavid Howells pgoff_t index, pgoff_t end, pgoff_t *_next) 58731143d5dSDavid Howells { 58831143d5dSDavid Howells struct page *page; 58931143d5dSDavid Howells int ret, n; 59031143d5dSDavid Howells 59131143d5dSDavid Howells _enter(",,%lx,%lx,", index, end); 59231143d5dSDavid Howells 59331143d5dSDavid Howells do { 594aef6e415SJan Kara n = find_get_pages_range_tag(mapping, &index, end, 595aef6e415SJan Kara PAGECACHE_TAG_DIRTY, 1, &page); 59631143d5dSDavid Howells if (!n) 59731143d5dSDavid Howells break; 59831143d5dSDavid Howells 59931143d5dSDavid Howells _debug("wback %lx", page->index); 60031143d5dSDavid Howells 601b93b0163SMatthew Wilcox /* 602b93b0163SMatthew Wilcox * at this point we hold neither the i_pages lock nor the 603b93b0163SMatthew Wilcox * page lock: the page may be truncated or invalidated 604b93b0163SMatthew Wilcox * (changing page->mapping to NULL), or even swizzled 605b93b0163SMatthew Wilcox * back from swapper_space to tmpfs file mapping 60631143d5dSDavid Howells */ 6074343d008SDavid Howells ret = lock_page_killable(page); 6084343d008SDavid Howells if (ret < 0) { 6094343d008SDavid Howells put_page(page); 6104343d008SDavid Howells _leave(" = %d", ret); 6114343d008SDavid Howells return ret; 6124343d008SDavid Howells } 61331143d5dSDavid Howells 614c5051c7bSDavid Howells if (page->mapping != mapping || !PageDirty(page)) { 61531143d5dSDavid Howells unlock_page(page); 61609cbfeafSKirill A. Shutemov put_page(page); 61731143d5dSDavid Howells continue; 61831143d5dSDavid Howells } 61931143d5dSDavid Howells 620c5051c7bSDavid Howells if (PageWriteback(page)) { 621c5051c7bSDavid Howells unlock_page(page); 62231143d5dSDavid Howells if (wbc->sync_mode != WB_SYNC_NONE) 62331143d5dSDavid Howells wait_on_page_writeback(page); 62429c8bbbdSDavid Howells put_page(page); 62531143d5dSDavid Howells continue; 62631143d5dSDavid Howells } 62731143d5dSDavid Howells 62865a15109SDavid Howells if (!clear_page_dirty_for_io(page)) 62965a15109SDavid Howells BUG(); 6304343d008SDavid Howells ret = afs_write_back_from_locked_page(mapping, wbc, page, end); 63109cbfeafSKirill A. Shutemov put_page(page); 63231143d5dSDavid Howells if (ret < 0) { 63331143d5dSDavid Howells _leave(" = %d", ret); 63431143d5dSDavid Howells return ret; 63531143d5dSDavid Howells } 63631143d5dSDavid Howells 63731143d5dSDavid Howells wbc->nr_to_write -= ret; 63831143d5dSDavid Howells 63931143d5dSDavid Howells cond_resched(); 64031143d5dSDavid Howells } while (index < end && wbc->nr_to_write > 0); 64131143d5dSDavid Howells 64231143d5dSDavid Howells *_next = index; 64331143d5dSDavid Howells _leave(" = 0 [%lx]", *_next); 64431143d5dSDavid Howells return 0; 64531143d5dSDavid Howells } 64631143d5dSDavid Howells 64731143d5dSDavid Howells /* 64831143d5dSDavid Howells * write some of the pending data back to the server 64931143d5dSDavid Howells */ 65031143d5dSDavid Howells int afs_writepages(struct address_space *mapping, 65131143d5dSDavid Howells struct writeback_control *wbc) 65231143d5dSDavid Howells { 65331143d5dSDavid Howells pgoff_t start, end, next; 65431143d5dSDavid Howells int ret; 65531143d5dSDavid Howells 65631143d5dSDavid Howells _enter(""); 65731143d5dSDavid Howells 65831143d5dSDavid Howells if (wbc->range_cyclic) { 65931143d5dSDavid Howells start = mapping->writeback_index; 66031143d5dSDavid Howells end = -1; 66131143d5dSDavid Howells ret = afs_writepages_region(mapping, wbc, start, end, &next); 6621b430beeSWu Fengguang if (start > 0 && wbc->nr_to_write > 0 && ret == 0) 66331143d5dSDavid Howells ret = afs_writepages_region(mapping, wbc, 0, start, 66431143d5dSDavid Howells &next); 66531143d5dSDavid Howells mapping->writeback_index = next; 66631143d5dSDavid Howells } else if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) { 66709cbfeafSKirill A. Shutemov end = (pgoff_t)(LLONG_MAX >> PAGE_SHIFT); 66831143d5dSDavid Howells ret = afs_writepages_region(mapping, wbc, 0, end, &next); 66931143d5dSDavid Howells if (wbc->nr_to_write > 0) 67031143d5dSDavid Howells mapping->writeback_index = next; 67131143d5dSDavid Howells } else { 67209cbfeafSKirill A. Shutemov start = wbc->range_start >> PAGE_SHIFT; 67309cbfeafSKirill A. Shutemov end = wbc->range_end >> PAGE_SHIFT; 67431143d5dSDavid Howells ret = afs_writepages_region(mapping, wbc, start, end, &next); 67531143d5dSDavid Howells } 67631143d5dSDavid Howells 67731143d5dSDavid Howells _leave(" = %d", ret); 67831143d5dSDavid Howells return ret; 67931143d5dSDavid Howells } 68031143d5dSDavid Howells 68131143d5dSDavid Howells /* 68231143d5dSDavid Howells * completion of write to server 68331143d5dSDavid Howells */ 68431143d5dSDavid Howells void afs_pages_written_back(struct afs_vnode *vnode, struct afs_call *call) 68531143d5dSDavid Howells { 68631143d5dSDavid Howells struct pagevec pv; 68713524ab3SDavid Howells unsigned long priv; 68831143d5dSDavid Howells unsigned count, loop; 68931143d5dSDavid Howells pgoff_t first = call->first, last = call->last; 69031143d5dSDavid Howells 6913b6492dfSDavid Howells _enter("{%llx:%llu},{%lx-%lx}", 69231143d5dSDavid Howells vnode->fid.vid, vnode->fid.vnode, first, last); 69331143d5dSDavid Howells 69486679820SMel Gorman pagevec_init(&pv); 69531143d5dSDavid Howells 69631143d5dSDavid Howells do { 6975bbf5d39SDavid Howells _debug("done %lx-%lx", first, last); 69831143d5dSDavid Howells 69931143d5dSDavid Howells count = last - first + 1; 70031143d5dSDavid Howells if (count > PAGEVEC_SIZE) 70131143d5dSDavid Howells count = PAGEVEC_SIZE; 7024343d008SDavid Howells pv.nr = find_get_pages_contig(vnode->vfs_inode.i_mapping, 7034343d008SDavid Howells first, count, pv.pages); 70431143d5dSDavid Howells ASSERTCMP(pv.nr, ==, count); 70531143d5dSDavid Howells 70631143d5dSDavid Howells for (loop = 0; loop < count; loop++) { 70713524ab3SDavid Howells priv = page_private(pv.pages[loop]); 70813524ab3SDavid Howells trace_afs_page_dirty(vnode, tracepoint_string("clear"), 70913524ab3SDavid Howells pv.pages[loop]->index, priv); 7104343d008SDavid Howells set_page_private(pv.pages[loop], 0); 7114343d008SDavid Howells end_page_writeback(pv.pages[loop]); 71231143d5dSDavid Howells } 71331143d5dSDavid Howells first += count; 71431143d5dSDavid Howells __pagevec_release(&pv); 7155bbf5d39SDavid Howells } while (first <= last); 71631143d5dSDavid Howells 7174343d008SDavid Howells afs_prune_wb_keys(vnode); 71831143d5dSDavid Howells _leave(""); 71931143d5dSDavid Howells } 72031143d5dSDavid Howells 72131143d5dSDavid Howells /* 72231143d5dSDavid Howells * write to an AFS file 72331143d5dSDavid Howells */ 72450b5551dSAl Viro ssize_t afs_file_write(struct kiocb *iocb, struct iov_iter *from) 72531143d5dSDavid Howells { 726496ad9aaSAl Viro struct afs_vnode *vnode = AFS_FS_I(file_inode(iocb->ki_filp)); 72731143d5dSDavid Howells ssize_t result; 72850b5551dSAl Viro size_t count = iov_iter_count(from); 72931143d5dSDavid Howells 7303b6492dfSDavid Howells _enter("{%llx:%llu},{%zu},", 73150b5551dSAl Viro vnode->fid.vid, vnode->fid.vnode, count); 73231143d5dSDavid Howells 73331143d5dSDavid Howells if (IS_SWAPFILE(&vnode->vfs_inode)) { 73431143d5dSDavid Howells printk(KERN_INFO 73531143d5dSDavid Howells "AFS: Attempt to write to active swap file!\n"); 73631143d5dSDavid Howells return -EBUSY; 73731143d5dSDavid Howells } 73831143d5dSDavid Howells 73931143d5dSDavid Howells if (!count) 74031143d5dSDavid Howells return 0; 74131143d5dSDavid Howells 74250b5551dSAl Viro result = generic_file_write_iter(iocb, from); 74331143d5dSDavid Howells 74431143d5dSDavid Howells _leave(" = %zd", result); 74531143d5dSDavid Howells return result; 74631143d5dSDavid Howells } 74731143d5dSDavid Howells 74831143d5dSDavid Howells /* 74931143d5dSDavid Howells * flush any dirty pages for this process, and check for write errors. 75031143d5dSDavid Howells * - the return status from this call provides a reliable indication of 75131143d5dSDavid Howells * whether any write errors occurred for this process. 75231143d5dSDavid Howells */ 75302c24a82SJosef Bacik int afs_fsync(struct file *file, loff_t start, loff_t end, int datasync) 75431143d5dSDavid Howells { 7553c981bfcSAl Viro struct inode *inode = file_inode(file); 7563c981bfcSAl Viro struct afs_vnode *vnode = AFS_FS_I(inode); 75731143d5dSDavid Howells 7583b6492dfSDavid Howells _enter("{%llx:%llu},{n=%pD},%d", 7593c981bfcSAl Viro vnode->fid.vid, vnode->fid.vnode, file, 76031143d5dSDavid Howells datasync); 76131143d5dSDavid Howells 7624343d008SDavid Howells return file_write_and_wait_range(file, start, end); 76331143d5dSDavid Howells } 7649b3f26c9SDavid Howells 7659b3f26c9SDavid Howells /* 7669b3f26c9SDavid Howells * notification that a previously read-only page is about to become writable 7679b3f26c9SDavid Howells * - if it returns an error, the caller will deliver a bus error signal 7689b3f26c9SDavid Howells */ 7690722f186SSouptick Joarder vm_fault_t afs_page_mkwrite(struct vm_fault *vmf) 7709b3f26c9SDavid Howells { 7711cf7a151SDavid Howells struct file *file = vmf->vma->vm_file; 7721cf7a151SDavid Howells struct inode *inode = file_inode(file); 7731cf7a151SDavid Howells struct afs_vnode *vnode = AFS_FS_I(inode); 7741cf7a151SDavid Howells unsigned long priv; 7759b3f26c9SDavid Howells 7763b6492dfSDavid Howells _enter("{{%llx:%llu}},{%lx}", 7771cf7a151SDavid Howells vnode->fid.vid, vnode->fid.vnode, vmf->page->index); 7789b3f26c9SDavid Howells 7791cf7a151SDavid Howells sb_start_pagefault(inode->i_sb); 7801cf7a151SDavid Howells 7811cf7a151SDavid Howells /* Wait for the page to be written to the cache before we allow it to 7821cf7a151SDavid Howells * be modified. We then assume the entire page will need writing back. 7831cf7a151SDavid Howells */ 7849b3f26c9SDavid Howells #ifdef CONFIG_AFS_FSCACHE 7851cf7a151SDavid Howells fscache_wait_on_page_write(vnode->cache, vmf->page); 7869b3f26c9SDavid Howells #endif 7879b3f26c9SDavid Howells 7881cf7a151SDavid Howells if (PageWriteback(vmf->page) && 7891cf7a151SDavid Howells wait_on_page_bit_killable(vmf->page, PG_writeback) < 0) 7901cf7a151SDavid Howells return VM_FAULT_RETRY; 7911cf7a151SDavid Howells 7921cf7a151SDavid Howells if (lock_page_killable(vmf->page) < 0) 7931cf7a151SDavid Howells return VM_FAULT_RETRY; 7941cf7a151SDavid Howells 7951cf7a151SDavid Howells /* We mustn't change page->private until writeback is complete as that 7961cf7a151SDavid Howells * details the portion of the page we need to write back and we might 7971cf7a151SDavid Howells * need to redirty the page if there's a problem. 7981cf7a151SDavid Howells */ 7991cf7a151SDavid Howells wait_on_page_writeback(vmf->page); 8001cf7a151SDavid Howells 8011cf7a151SDavid Howells priv = (unsigned long)PAGE_SIZE << AFS_PRIV_SHIFT; /* To */ 8021cf7a151SDavid Howells priv |= 0; /* From */ 80313524ab3SDavid Howells trace_afs_page_dirty(vnode, tracepoint_string("mkwrite"), 80413524ab3SDavid Howells vmf->page->index, priv); 8051cf7a151SDavid Howells SetPagePrivate(vmf->page); 8061cf7a151SDavid Howells set_page_private(vmf->page, priv); 8071cf7a151SDavid Howells 8081cf7a151SDavid Howells sb_end_pagefault(inode->i_sb); 8091cf7a151SDavid Howells return VM_FAULT_LOCKED; 8109b3f26c9SDavid Howells } 8114343d008SDavid Howells 8124343d008SDavid Howells /* 8134343d008SDavid Howells * Prune the keys cached for writeback. The caller must hold vnode->wb_lock. 8144343d008SDavid Howells */ 8154343d008SDavid Howells void afs_prune_wb_keys(struct afs_vnode *vnode) 8164343d008SDavid Howells { 8174343d008SDavid Howells LIST_HEAD(graveyard); 8184343d008SDavid Howells struct afs_wb_key *wbk, *tmp; 8194343d008SDavid Howells 8204343d008SDavid Howells /* Discard unused keys */ 8214343d008SDavid Howells spin_lock(&vnode->wb_lock); 8224343d008SDavid Howells 8234343d008SDavid Howells if (!mapping_tagged(&vnode->vfs_inode.i_data, PAGECACHE_TAG_WRITEBACK) && 8244343d008SDavid Howells !mapping_tagged(&vnode->vfs_inode.i_data, PAGECACHE_TAG_DIRTY)) { 8254343d008SDavid Howells list_for_each_entry_safe(wbk, tmp, &vnode->wb_keys, vnode_link) { 8264343d008SDavid Howells if (refcount_read(&wbk->usage) == 1) 8274343d008SDavid Howells list_move(&wbk->vnode_link, &graveyard); 8284343d008SDavid Howells } 8294343d008SDavid Howells } 8304343d008SDavid Howells 8314343d008SDavid Howells spin_unlock(&vnode->wb_lock); 8324343d008SDavid Howells 8334343d008SDavid Howells while (!list_empty(&graveyard)) { 8344343d008SDavid Howells wbk = list_entry(graveyard.next, struct afs_wb_key, vnode_link); 8354343d008SDavid Howells list_del(&wbk->vnode_link); 8364343d008SDavid Howells afs_put_wb_key(wbk); 8374343d008SDavid Howells } 8384343d008SDavid Howells } 8394343d008SDavid Howells 8404343d008SDavid Howells /* 8414343d008SDavid Howells * Clean up a page during invalidation. 8424343d008SDavid Howells */ 8434343d008SDavid Howells int afs_launder_page(struct page *page) 8444343d008SDavid Howells { 8454343d008SDavid Howells struct address_space *mapping = page->mapping; 8464343d008SDavid Howells struct afs_vnode *vnode = AFS_FS_I(mapping->host); 8474343d008SDavid Howells unsigned long priv; 8484343d008SDavid Howells unsigned int f, t; 8494343d008SDavid Howells int ret = 0; 8504343d008SDavid Howells 8514343d008SDavid Howells _enter("{%lx}", page->index); 8524343d008SDavid Howells 8534343d008SDavid Howells priv = page_private(page); 8544343d008SDavid Howells if (clear_page_dirty_for_io(page)) { 8554343d008SDavid Howells f = 0; 8564343d008SDavid Howells t = PAGE_SIZE; 8574343d008SDavid Howells if (PagePrivate(page)) { 8584343d008SDavid Howells f = priv & AFS_PRIV_MAX; 8594343d008SDavid Howells t = priv >> AFS_PRIV_SHIFT; 8604343d008SDavid Howells } 8614343d008SDavid Howells 86213524ab3SDavid Howells trace_afs_page_dirty(vnode, tracepoint_string("launder"), 86313524ab3SDavid Howells page->index, priv); 8644343d008SDavid Howells ret = afs_store_data(mapping, page->index, page->index, t, f); 8654343d008SDavid Howells } 8664343d008SDavid Howells 86713524ab3SDavid Howells trace_afs_page_dirty(vnode, tracepoint_string("laundered"), 86813524ab3SDavid Howells page->index, priv); 8694343d008SDavid Howells set_page_private(page, 0); 8704343d008SDavid Howells ClearPagePrivate(page); 8714343d008SDavid Howells 8724343d008SDavid Howells #ifdef CONFIG_AFS_FSCACHE 8734343d008SDavid Howells if (PageFsCache(page)) { 8744343d008SDavid Howells fscache_wait_on_page_write(vnode->cache, page); 8754343d008SDavid Howells fscache_uncache_page(vnode->cache, page); 8764343d008SDavid Howells } 8774343d008SDavid Howells #endif 8784343d008SDavid Howells return ret; 87931143d5dSDavid Howells } 880