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 51ee102584SZhengyuan Liu req = kzalloc(struct_size(req, array, 1), GFP_KERNEL); 52196ee9cdSDavid Howells if (!req) 53196ee9cdSDavid Howells return -ENOMEM; 54196ee9cdSDavid Howells 55f3ddee8dSDavid Howells refcount_set(&req->usage, 1); 56196ee9cdSDavid Howells req->pos = pos; 57e8e581a8SDavid Howells req->len = len; 58196ee9cdSDavid Howells req->nr_pages = 1; 59f3ddee8dSDavid Howells req->pages = req->array; 60196ee9cdSDavid Howells req->pages[0] = page; 615611ef28SDavid Howells get_page(page); 62196ee9cdSDavid Howells 63d2ddc776SDavid Howells ret = afs_fetch_data(vnode, key, req); 64196ee9cdSDavid Howells afs_put_read(req); 6531143d5dSDavid Howells if (ret < 0) { 6631143d5dSDavid Howells if (ret == -ENOENT) { 6731143d5dSDavid Howells _debug("got NOENT from server" 6831143d5dSDavid Howells " - marking file deleted and stale"); 6931143d5dSDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 7031143d5dSDavid Howells ret = -ESTALE; 7131143d5dSDavid Howells } 7231143d5dSDavid Howells } 7331143d5dSDavid Howells 7431143d5dSDavid Howells _leave(" = %d", ret); 7531143d5dSDavid Howells return ret; 7631143d5dSDavid Howells } 7731143d5dSDavid Howells 7831143d5dSDavid Howells /* 7931143d5dSDavid Howells * prepare to perform part of a write to a page 8031143d5dSDavid Howells */ 8115b4650eSNick Piggin int afs_write_begin(struct file *file, struct address_space *mapping, 8215b4650eSNick Piggin loff_t pos, unsigned len, unsigned flags, 8315b4650eSNick Piggin struct page **pagep, void **fsdata) 8431143d5dSDavid Howells { 85496ad9aaSAl Viro struct afs_vnode *vnode = AFS_FS_I(file_inode(file)); 8615b4650eSNick Piggin struct page *page; 87215804a9SDavid Howells struct key *key = afs_file_key(file); 884343d008SDavid Howells unsigned long priv; 894343d008SDavid Howells unsigned f, from = pos & (PAGE_SIZE - 1); 904343d008SDavid Howells unsigned t, to = from + len; 9109cbfeafSKirill A. Shutemov pgoff_t index = pos >> PAGE_SHIFT; 9231143d5dSDavid Howells int ret; 9331143d5dSDavid Howells 943b6492dfSDavid Howells _enter("{%llx:%llu},{%lx},%u,%u", 9515b4650eSNick Piggin vnode->fid.vid, vnode->fid.vnode, index, from, to); 9631143d5dSDavid Howells 974343d008SDavid Howells /* We want to store information about how much of a page is altered in 984343d008SDavid Howells * page->private. 994343d008SDavid Howells */ 1004343d008SDavid Howells BUILD_BUG_ON(PAGE_SIZE > 32768 && sizeof(page->private) < 8); 10131143d5dSDavid Howells 10254566b2cSNick Piggin page = grab_cache_page_write_begin(mapping, index, flags); 1034343d008SDavid Howells if (!page) 10415b4650eSNick Piggin return -ENOMEM; 10515b4650eSNick Piggin 10609cbfeafSKirill A. Shutemov if (!PageUptodate(page) && len != PAGE_SIZE) { 107e8e581a8SDavid Howells ret = afs_fill_page(vnode, key, pos & PAGE_MASK, PAGE_SIZE, page); 10831143d5dSDavid Howells if (ret < 0) { 1096d06b0d2SDavid Howells unlock_page(page); 1106d06b0d2SDavid Howells put_page(page); 11131143d5dSDavid Howells _leave(" = %d [prep]", ret); 11231143d5dSDavid Howells return ret; 11331143d5dSDavid Howells } 11415b4650eSNick Piggin SetPageUptodate(page); 11531143d5dSDavid Howells } 11631143d5dSDavid Howells 1176d06b0d2SDavid Howells /* page won't leak in error case: it eventually gets cleaned off LRU */ 1186d06b0d2SDavid Howells *pagep = page; 1196d06b0d2SDavid Howells 12031143d5dSDavid Howells try_again: 1214343d008SDavid Howells /* See if this page is already partially written in a way that we can 1224343d008SDavid Howells * merge the new write with. 1234343d008SDavid Howells */ 1244343d008SDavid Howells t = f = 0; 1254343d008SDavid Howells if (PagePrivate(page)) { 1264343d008SDavid Howells priv = page_private(page); 1274343d008SDavid Howells f = priv & AFS_PRIV_MAX; 1284343d008SDavid Howells t = priv >> AFS_PRIV_SHIFT; 1294343d008SDavid Howells ASSERTCMP(f, <=, t); 13031143d5dSDavid Howells } 13131143d5dSDavid Howells 1324343d008SDavid Howells if (f != t) { 1335a039c32SDavid Howells if (PageWriteback(page)) { 1345a039c32SDavid Howells trace_afs_page_dirty(vnode, tracepoint_string("alrdy"), 1355a039c32SDavid Howells page->index, priv); 1365a039c32SDavid Howells goto flush_conflicting_write; 1375a039c32SDavid Howells } 1385a813276SDavid Howells /* If the file is being filled locally, allow inter-write 1395a813276SDavid Howells * spaces to be merged into writes. If it's not, only write 1405a813276SDavid Howells * back what the user gives us. 1415a813276SDavid Howells */ 1425a813276SDavid Howells if (!test_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags) && 1435a813276SDavid Howells (to < f || from > t)) 1444343d008SDavid Howells goto flush_conflicting_write; 1454343d008SDavid Howells if (from < f) 1464343d008SDavid Howells f = from; 1474343d008SDavid Howells if (to > t) 1484343d008SDavid Howells t = to; 1494343d008SDavid Howells } else { 1504343d008SDavid Howells f = from; 1514343d008SDavid Howells t = to; 15231143d5dSDavid Howells } 15331143d5dSDavid Howells 1544343d008SDavid Howells priv = (unsigned long)t << AFS_PRIV_SHIFT; 1554343d008SDavid Howells priv |= f; 15613524ab3SDavid Howells trace_afs_page_dirty(vnode, tracepoint_string("begin"), 15713524ab3SDavid Howells page->index, priv); 15831143d5dSDavid Howells SetPagePrivate(page); 1594343d008SDavid Howells set_page_private(page, priv); 1604343d008SDavid Howells _leave(" = 0"); 16131143d5dSDavid Howells return 0; 16231143d5dSDavid Howells 1634343d008SDavid Howells /* The previous write and this write aren't adjacent or overlapping, so 1644343d008SDavid Howells * flush the page out. 1654343d008SDavid Howells */ 1664343d008SDavid Howells flush_conflicting_write: 16731143d5dSDavid Howells _debug("flush conflict"); 1684343d008SDavid Howells ret = write_one_page(page); 16931143d5dSDavid Howells if (ret < 0) { 17031143d5dSDavid Howells _leave(" = %d", ret); 17131143d5dSDavid Howells return ret; 17231143d5dSDavid Howells } 17331143d5dSDavid Howells 1744343d008SDavid Howells ret = lock_page_killable(page); 1754343d008SDavid Howells if (ret < 0) { 1764343d008SDavid Howells _leave(" = %d", ret); 1774343d008SDavid Howells return ret; 1784343d008SDavid Howells } 17931143d5dSDavid Howells goto try_again; 18031143d5dSDavid Howells } 18131143d5dSDavid Howells 18231143d5dSDavid Howells /* 18331143d5dSDavid Howells * finalise part of a write to a page 18431143d5dSDavid Howells */ 18515b4650eSNick Piggin int afs_write_end(struct file *file, struct address_space *mapping, 18615b4650eSNick Piggin loff_t pos, unsigned len, unsigned copied, 18715b4650eSNick Piggin struct page *page, void *fsdata) 18831143d5dSDavid Howells { 189496ad9aaSAl Viro struct afs_vnode *vnode = AFS_FS_I(file_inode(file)); 190215804a9SDavid Howells struct key *key = afs_file_key(file); 19131143d5dSDavid Howells loff_t i_size, maybe_i_size; 192e8e581a8SDavid Howells int ret; 19331143d5dSDavid Howells 1943b6492dfSDavid Howells _enter("{%llx:%llu},{%lx}", 19515b4650eSNick Piggin vnode->fid.vid, vnode->fid.vnode, page->index); 19631143d5dSDavid Howells 19715b4650eSNick Piggin maybe_i_size = pos + copied; 19831143d5dSDavid Howells 19931143d5dSDavid Howells i_size = i_size_read(&vnode->vfs_inode); 20031143d5dSDavid Howells if (maybe_i_size > i_size) { 2014343d008SDavid Howells spin_lock(&vnode->wb_lock); 20231143d5dSDavid Howells i_size = i_size_read(&vnode->vfs_inode); 20331143d5dSDavid Howells if (maybe_i_size > i_size) 20431143d5dSDavid Howells i_size_write(&vnode->vfs_inode, maybe_i_size); 2054343d008SDavid Howells spin_unlock(&vnode->wb_lock); 20631143d5dSDavid Howells } 20731143d5dSDavid Howells 208e8e581a8SDavid Howells if (!PageUptodate(page)) { 209e8e581a8SDavid Howells if (copied < len) { 210e8e581a8SDavid Howells /* Try and load any missing data from the server. The 211e8e581a8SDavid Howells * unmarshalling routine will take care of clearing any 212e8e581a8SDavid Howells * bits that are beyond the EOF. 213e8e581a8SDavid Howells */ 214e8e581a8SDavid Howells ret = afs_fill_page(vnode, key, pos + copied, 215e8e581a8SDavid Howells len - copied, page); 216e8e581a8SDavid Howells if (ret < 0) 217afae457dSDavid Howells goto out; 218e8e581a8SDavid Howells } 219e8e581a8SDavid Howells SetPageUptodate(page); 220e8e581a8SDavid Howells } 221e8e581a8SDavid Howells 22231143d5dSDavid Howells set_page_dirty(page); 22331143d5dSDavid Howells if (PageDirty(page)) 22431143d5dSDavid Howells _debug("dirtied"); 225afae457dSDavid Howells ret = copied; 226afae457dSDavid Howells 227afae457dSDavid Howells out: 22815b4650eSNick Piggin unlock_page(page); 22909cbfeafSKirill A. Shutemov put_page(page); 230afae457dSDavid Howells return ret; 23131143d5dSDavid Howells } 23231143d5dSDavid Howells 23331143d5dSDavid Howells /* 23431143d5dSDavid Howells * kill all the pages in the given range 23531143d5dSDavid Howells */ 2364343d008SDavid Howells static void afs_kill_pages(struct address_space *mapping, 23731143d5dSDavid Howells pgoff_t first, pgoff_t last) 23831143d5dSDavid Howells { 2394343d008SDavid Howells struct afs_vnode *vnode = AFS_FS_I(mapping->host); 24031143d5dSDavid Howells struct pagevec pv; 24131143d5dSDavid Howells unsigned count, loop; 24231143d5dSDavid Howells 2433b6492dfSDavid Howells _enter("{%llx:%llu},%lx-%lx", 24431143d5dSDavid Howells vnode->fid.vid, vnode->fid.vnode, first, last); 24531143d5dSDavid Howells 24686679820SMel Gorman pagevec_init(&pv); 24731143d5dSDavid Howells 24831143d5dSDavid Howells do { 24931143d5dSDavid Howells _debug("kill %lx-%lx", first, last); 25031143d5dSDavid Howells 25131143d5dSDavid Howells count = last - first + 1; 25231143d5dSDavid Howells if (count > PAGEVEC_SIZE) 25331143d5dSDavid Howells count = PAGEVEC_SIZE; 2544343d008SDavid Howells pv.nr = find_get_pages_contig(mapping, first, count, pv.pages); 25531143d5dSDavid Howells ASSERTCMP(pv.nr, ==, count); 25631143d5dSDavid Howells 25731143d5dSDavid Howells for (loop = 0; loop < count; loop++) { 2587286a35eSDavid Howells struct page *page = pv.pages[loop]; 2597286a35eSDavid Howells ClearPageUptodate(page); 2607286a35eSDavid Howells SetPageError(page); 2614343d008SDavid Howells end_page_writeback(page); 2624343d008SDavid Howells if (page->index >= first) 2634343d008SDavid Howells first = page->index + 1; 2644343d008SDavid Howells lock_page(page); 2654343d008SDavid Howells generic_error_remove_page(mapping, page); 26621bd68f1SMarc Dionne unlock_page(page); 2674343d008SDavid Howells } 2684343d008SDavid Howells 2694343d008SDavid Howells __pagevec_release(&pv); 2704343d008SDavid Howells } while (first <= last); 2714343d008SDavid Howells 2724343d008SDavid Howells _leave(""); 2734343d008SDavid Howells } 2744343d008SDavid Howells 2754343d008SDavid Howells /* 2764343d008SDavid Howells * Redirty all the pages in a given range. 2774343d008SDavid Howells */ 2784343d008SDavid Howells static void afs_redirty_pages(struct writeback_control *wbc, 2794343d008SDavid Howells struct address_space *mapping, 2804343d008SDavid Howells pgoff_t first, pgoff_t last) 2814343d008SDavid Howells { 2824343d008SDavid Howells struct afs_vnode *vnode = AFS_FS_I(mapping->host); 2834343d008SDavid Howells struct pagevec pv; 2844343d008SDavid Howells unsigned count, loop; 2854343d008SDavid Howells 2863b6492dfSDavid Howells _enter("{%llx:%llu},%lx-%lx", 2874343d008SDavid Howells vnode->fid.vid, vnode->fid.vnode, first, last); 2884343d008SDavid Howells 289487e2c9fSLinus Torvalds pagevec_init(&pv); 2904343d008SDavid Howells 2914343d008SDavid Howells do { 2924343d008SDavid Howells _debug("redirty %lx-%lx", first, last); 2934343d008SDavid Howells 2944343d008SDavid Howells count = last - first + 1; 2954343d008SDavid Howells if (count > PAGEVEC_SIZE) 2964343d008SDavid Howells count = PAGEVEC_SIZE; 2974343d008SDavid Howells pv.nr = find_get_pages_contig(mapping, first, count, pv.pages); 2984343d008SDavid Howells ASSERTCMP(pv.nr, ==, count); 2994343d008SDavid Howells 3004343d008SDavid Howells for (loop = 0; loop < count; loop++) { 3014343d008SDavid Howells struct page *page = pv.pages[loop]; 3024343d008SDavid Howells 3034343d008SDavid Howells redirty_page_for_writepage(wbc, page); 3047286a35eSDavid Howells end_page_writeback(page); 3057286a35eSDavid Howells if (page->index >= first) 3067286a35eSDavid Howells first = page->index + 1; 30731143d5dSDavid Howells } 30831143d5dSDavid Howells 30931143d5dSDavid Howells __pagevec_release(&pv); 3104343d008SDavid Howells } while (first <= last); 31131143d5dSDavid Howells 31231143d5dSDavid Howells _leave(""); 31331143d5dSDavid Howells } 31431143d5dSDavid Howells 31531143d5dSDavid Howells /* 316a58823acSDavid Howells * completion of write to server 317a58823acSDavid Howells */ 318a58823acSDavid Howells static void afs_pages_written_back(struct afs_vnode *vnode, 319a58823acSDavid Howells pgoff_t first, pgoff_t last) 320a58823acSDavid Howells { 321a58823acSDavid Howells struct pagevec pv; 322a58823acSDavid Howells unsigned long priv; 323a58823acSDavid Howells unsigned count, loop; 324a58823acSDavid Howells 325a58823acSDavid Howells _enter("{%llx:%llu},{%lx-%lx}", 326a58823acSDavid Howells vnode->fid.vid, vnode->fid.vnode, first, last); 327a58823acSDavid Howells 328a58823acSDavid Howells pagevec_init(&pv); 329a58823acSDavid Howells 330a58823acSDavid Howells do { 331a58823acSDavid Howells _debug("done %lx-%lx", first, last); 332a58823acSDavid Howells 333a58823acSDavid Howells count = last - first + 1; 334a58823acSDavid Howells if (count > PAGEVEC_SIZE) 335a58823acSDavid Howells count = PAGEVEC_SIZE; 336a58823acSDavid Howells pv.nr = find_get_pages_contig(vnode->vfs_inode.i_mapping, 337a58823acSDavid Howells first, count, pv.pages); 338a58823acSDavid Howells ASSERTCMP(pv.nr, ==, count); 339a58823acSDavid Howells 340a58823acSDavid Howells for (loop = 0; loop < count; loop++) { 341a58823acSDavid Howells priv = page_private(pv.pages[loop]); 342a58823acSDavid Howells trace_afs_page_dirty(vnode, tracepoint_string("clear"), 343a58823acSDavid Howells pv.pages[loop]->index, priv); 344a58823acSDavid Howells set_page_private(pv.pages[loop], 0); 345a58823acSDavid Howells end_page_writeback(pv.pages[loop]); 346a58823acSDavid Howells } 347a58823acSDavid Howells first += count; 348a58823acSDavid Howells __pagevec_release(&pv); 349a58823acSDavid Howells } while (first <= last); 350a58823acSDavid Howells 351a58823acSDavid Howells afs_prune_wb_keys(vnode); 352a58823acSDavid Howells _leave(""); 353a58823acSDavid Howells } 354a58823acSDavid Howells 355a58823acSDavid Howells /* 356d2ddc776SDavid Howells * write to a file 35731143d5dSDavid Howells */ 3584343d008SDavid Howells static int afs_store_data(struct address_space *mapping, 3594343d008SDavid Howells pgoff_t first, pgoff_t last, 360d2ddc776SDavid Howells unsigned offset, unsigned to) 36131143d5dSDavid Howells { 3624343d008SDavid Howells struct afs_vnode *vnode = AFS_FS_I(mapping->host); 363d2ddc776SDavid Howells struct afs_fs_cursor fc; 364a58823acSDavid Howells struct afs_status_cb *scb; 3654343d008SDavid Howells struct afs_wb_key *wbk = NULL; 3664343d008SDavid Howells struct list_head *p; 3674343d008SDavid Howells int ret = -ENOKEY, ret2; 368d2ddc776SDavid Howells 3693b6492dfSDavid Howells _enter("%s{%llx:%llu.%u},%lx,%lx,%x,%x", 370d2ddc776SDavid Howells vnode->volume->name, 371d2ddc776SDavid Howells vnode->fid.vid, 372d2ddc776SDavid Howells vnode->fid.vnode, 373d2ddc776SDavid Howells vnode->fid.unique, 374d2ddc776SDavid Howells first, last, offset, to); 375d2ddc776SDavid Howells 376a58823acSDavid Howells scb = kzalloc(sizeof(struct afs_status_cb), GFP_NOFS); 377a58823acSDavid Howells if (!scb) 378a58823acSDavid Howells return -ENOMEM; 379a58823acSDavid Howells 3804343d008SDavid Howells spin_lock(&vnode->wb_lock); 3814343d008SDavid Howells p = vnode->wb_keys.next; 3824343d008SDavid Howells 3834343d008SDavid Howells /* Iterate through the list looking for a valid key to use. */ 3844343d008SDavid Howells try_next_key: 3854343d008SDavid Howells while (p != &vnode->wb_keys) { 3864343d008SDavid Howells wbk = list_entry(p, struct afs_wb_key, vnode_link); 3874343d008SDavid Howells _debug("wbk %u", key_serial(wbk->key)); 3884343d008SDavid Howells ret2 = key_validate(wbk->key); 3894343d008SDavid Howells if (ret2 == 0) 3904343d008SDavid Howells goto found_key; 3914343d008SDavid Howells if (ret == -ENOKEY) 3924343d008SDavid Howells ret = ret2; 3934343d008SDavid Howells p = p->next; 3944343d008SDavid Howells } 3954343d008SDavid Howells 3964343d008SDavid Howells spin_unlock(&vnode->wb_lock); 3974343d008SDavid Howells afs_put_wb_key(wbk); 398a58823acSDavid Howells kfree(scb); 3994343d008SDavid Howells _leave(" = %d [no keys]", ret); 4004343d008SDavid Howells return ret; 4014343d008SDavid Howells 4024343d008SDavid Howells found_key: 4034343d008SDavid Howells refcount_inc(&wbk->usage); 4044343d008SDavid Howells spin_unlock(&vnode->wb_lock); 4054343d008SDavid Howells 4064343d008SDavid Howells _debug("USE WB KEY %u", key_serial(wbk->key)); 4074343d008SDavid Howells 408d2ddc776SDavid Howells ret = -ERESTARTSYS; 40920b8391fSDavid Howells if (afs_begin_vnode_operation(&fc, vnode, wbk->key, false)) { 410a58823acSDavid Howells afs_dataversion_t data_version = vnode->status.data_version + 1; 411a58823acSDavid Howells 412d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 41368251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(vnode); 414a58823acSDavid Howells afs_fs_store_data(&fc, mapping, first, last, offset, to, scb); 415d2ddc776SDavid Howells } 416d2ddc776SDavid Howells 417a58823acSDavid Howells afs_check_for_remote_deletion(&fc, vnode); 418a58823acSDavid Howells afs_vnode_commit_status(&fc, vnode, fc.cb_break, 419a58823acSDavid Howells &data_version, scb); 420a58823acSDavid Howells if (fc.ac.error == 0) 421a58823acSDavid Howells afs_pages_written_back(vnode, first, last); 422d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 423d2ddc776SDavid Howells } 424d2ddc776SDavid Howells 4254343d008SDavid Howells switch (ret) { 42676a5cb6fSDavid Howells case 0: 42776a5cb6fSDavid Howells afs_stat_v(vnode, n_stores); 42876a5cb6fSDavid Howells atomic_long_add((last * PAGE_SIZE + to) - 42976a5cb6fSDavid Howells (first * PAGE_SIZE + offset), 43076a5cb6fSDavid Howells &afs_v2net(vnode)->n_store_bytes); 43176a5cb6fSDavid Howells break; 4324343d008SDavid Howells case -EACCES: 4334343d008SDavid Howells case -EPERM: 4344343d008SDavid Howells case -ENOKEY: 4354343d008SDavid Howells case -EKEYEXPIRED: 4364343d008SDavid Howells case -EKEYREJECTED: 4374343d008SDavid Howells case -EKEYREVOKED: 4384343d008SDavid Howells _debug("next"); 4394343d008SDavid Howells spin_lock(&vnode->wb_lock); 4404343d008SDavid Howells p = wbk->vnode_link.next; 4414343d008SDavid Howells afs_put_wb_key(wbk); 4424343d008SDavid Howells goto try_next_key; 4434343d008SDavid Howells } 4444343d008SDavid Howells 4454343d008SDavid Howells afs_put_wb_key(wbk); 446a58823acSDavid Howells kfree(scb); 447d2ddc776SDavid Howells _leave(" = %d", ret); 448d2ddc776SDavid Howells return ret; 449d2ddc776SDavid Howells } 450d2ddc776SDavid Howells 451d2ddc776SDavid Howells /* 4524343d008SDavid Howells * Synchronously write back the locked page and any subsequent non-locked dirty 4534343d008SDavid Howells * pages. 45431143d5dSDavid Howells */ 4554343d008SDavid Howells static int afs_write_back_from_locked_page(struct address_space *mapping, 4564343d008SDavid Howells struct writeback_control *wbc, 4574343d008SDavid Howells struct page *primary_page, 4584343d008SDavid Howells pgoff_t final_page) 45931143d5dSDavid Howells { 46013524ab3SDavid Howells struct afs_vnode *vnode = AFS_FS_I(mapping->host); 46131143d5dSDavid Howells struct page *pages[8], *page; 4624343d008SDavid Howells unsigned long count, priv; 4634343d008SDavid Howells unsigned n, offset, to, f, t; 46431143d5dSDavid Howells pgoff_t start, first, last; 46531143d5dSDavid Howells int loop, ret; 46631143d5dSDavid Howells 46731143d5dSDavid Howells _enter(",%lx", primary_page->index); 46831143d5dSDavid Howells 46931143d5dSDavid Howells count = 1; 47031143d5dSDavid Howells if (test_set_page_writeback(primary_page)) 47131143d5dSDavid Howells BUG(); 47231143d5dSDavid Howells 4734343d008SDavid Howells /* Find all consecutive lockable dirty pages that have contiguous 4744343d008SDavid Howells * written regions, stopping when we find a page that is not 4754343d008SDavid Howells * immediately lockable, is not dirty or is missing, or we reach the 4764343d008SDavid Howells * end of the range. 4774343d008SDavid Howells */ 47831143d5dSDavid Howells start = primary_page->index; 4794343d008SDavid Howells priv = page_private(primary_page); 4804343d008SDavid Howells offset = priv & AFS_PRIV_MAX; 4814343d008SDavid Howells to = priv >> AFS_PRIV_SHIFT; 48213524ab3SDavid Howells trace_afs_page_dirty(vnode, tracepoint_string("store"), 48313524ab3SDavid Howells primary_page->index, priv); 4844343d008SDavid Howells 4854343d008SDavid Howells WARN_ON(offset == to); 48613524ab3SDavid Howells if (offset == to) 48713524ab3SDavid Howells trace_afs_page_dirty(vnode, tracepoint_string("WARN"), 48813524ab3SDavid Howells primary_page->index, priv); 4894343d008SDavid Howells 4905a813276SDavid Howells if (start >= final_page || 4915a813276SDavid Howells (to < PAGE_SIZE && !test_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags))) 49231143d5dSDavid Howells goto no_more; 4934343d008SDavid Howells 49431143d5dSDavid Howells start++; 49531143d5dSDavid Howells do { 49631143d5dSDavid Howells _debug("more %lx [%lx]", start, count); 4974343d008SDavid Howells n = final_page - start + 1; 49831143d5dSDavid Howells if (n > ARRAY_SIZE(pages)) 49931143d5dSDavid Howells n = ARRAY_SIZE(pages); 5004343d008SDavid Howells n = find_get_pages_contig(mapping, start, ARRAY_SIZE(pages), pages); 50131143d5dSDavid Howells _debug("fgpc %u", n); 50231143d5dSDavid Howells if (n == 0) 50331143d5dSDavid Howells goto no_more; 50431143d5dSDavid Howells if (pages[0]->index != start) { 5059d577b6aSDavid Howells do { 5069d577b6aSDavid Howells put_page(pages[--n]); 5079d577b6aSDavid Howells } while (n > 0); 50831143d5dSDavid Howells goto no_more; 50931143d5dSDavid Howells } 51031143d5dSDavid Howells 51131143d5dSDavid Howells for (loop = 0; loop < n; loop++) { 51231143d5dSDavid Howells page = pages[loop]; 5135a813276SDavid Howells if (to != PAGE_SIZE && 5145a813276SDavid Howells !test_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags)) 5155a813276SDavid Howells break; 5164343d008SDavid Howells if (page->index > final_page) 51731143d5dSDavid Howells break; 518529ae9aaSNick Piggin if (!trylock_page(page)) 51931143d5dSDavid Howells break; 5204343d008SDavid Howells if (!PageDirty(page) || PageWriteback(page)) { 52131143d5dSDavid Howells unlock_page(page); 52231143d5dSDavid Howells break; 52331143d5dSDavid Howells } 5244343d008SDavid Howells 5254343d008SDavid Howells priv = page_private(page); 5264343d008SDavid Howells f = priv & AFS_PRIV_MAX; 5274343d008SDavid Howells t = priv >> AFS_PRIV_SHIFT; 5285a813276SDavid Howells if (f != 0 && 5295a813276SDavid Howells !test_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags)) { 5304343d008SDavid Howells unlock_page(page); 5314343d008SDavid Howells break; 5324343d008SDavid Howells } 5334343d008SDavid Howells to = t; 5344343d008SDavid Howells 53513524ab3SDavid Howells trace_afs_page_dirty(vnode, tracepoint_string("store+"), 53613524ab3SDavid Howells page->index, priv); 53713524ab3SDavid Howells 53831143d5dSDavid Howells if (!clear_page_dirty_for_io(page)) 53931143d5dSDavid Howells BUG(); 54031143d5dSDavid Howells if (test_set_page_writeback(page)) 54131143d5dSDavid Howells BUG(); 54231143d5dSDavid Howells unlock_page(page); 54331143d5dSDavid Howells put_page(page); 54431143d5dSDavid Howells } 54531143d5dSDavid Howells count += loop; 54631143d5dSDavid Howells if (loop < n) { 54731143d5dSDavid Howells for (; loop < n; loop++) 54831143d5dSDavid Howells put_page(pages[loop]); 54931143d5dSDavid Howells goto no_more; 55031143d5dSDavid Howells } 55131143d5dSDavid Howells 55231143d5dSDavid Howells start += loop; 5534343d008SDavid Howells } while (start <= final_page && count < 65536); 55431143d5dSDavid Howells 55531143d5dSDavid Howells no_more: 5564343d008SDavid Howells /* We now have a contiguous set of dirty pages, each with writeback 5574343d008SDavid Howells * set; the first page is still locked at this point, but all the rest 5584343d008SDavid Howells * have been unlocked. 5594343d008SDavid Howells */ 5604343d008SDavid Howells unlock_page(primary_page); 5614343d008SDavid Howells 56231143d5dSDavid Howells first = primary_page->index; 56331143d5dSDavid Howells last = first + count - 1; 56431143d5dSDavid Howells 56531143d5dSDavid Howells _debug("write back %lx[%u..] to %lx[..%u]", first, offset, last, to); 56631143d5dSDavid Howells 5674343d008SDavid Howells ret = afs_store_data(mapping, first, last, offset, to); 56831143d5dSDavid Howells switch (ret) { 5694343d008SDavid Howells case 0: 5704343d008SDavid Howells ret = count; 5714343d008SDavid Howells break; 5724343d008SDavid Howells 5734343d008SDavid Howells default: 5744343d008SDavid Howells pr_notice("kAFS: Unexpected error from FS.StoreData %d\n", ret); 5754343d008SDavid Howells /* Fall through */ 5764343d008SDavid Howells case -EACCES: 5774343d008SDavid Howells case -EPERM: 5784343d008SDavid Howells case -ENOKEY: 5794343d008SDavid Howells case -EKEYEXPIRED: 5804343d008SDavid Howells case -EKEYREJECTED: 5814343d008SDavid Howells case -EKEYREVOKED: 5824343d008SDavid Howells afs_redirty_pages(wbc, mapping, first, last); 5834343d008SDavid Howells mapping_set_error(mapping, ret); 5844343d008SDavid Howells break; 5854343d008SDavid Howells 58631143d5dSDavid Howells case -EDQUOT: 58731143d5dSDavid Howells case -ENOSPC: 5884343d008SDavid Howells afs_redirty_pages(wbc, mapping, first, last); 5894343d008SDavid Howells mapping_set_error(mapping, -ENOSPC); 59031143d5dSDavid Howells break; 5914343d008SDavid Howells 59231143d5dSDavid Howells case -EROFS: 59331143d5dSDavid Howells case -EIO: 59431143d5dSDavid Howells case -EREMOTEIO: 59531143d5dSDavid Howells case -EFBIG: 59631143d5dSDavid Howells case -ENOENT: 59731143d5dSDavid Howells case -ENOMEDIUM: 59831143d5dSDavid Howells case -ENXIO: 599f51375cdSDavid Howells trace_afs_file_error(vnode, ret, afs_file_error_writeback_fail); 6004343d008SDavid Howells afs_kill_pages(mapping, first, last); 6014343d008SDavid Howells mapping_set_error(mapping, ret); 60231143d5dSDavid Howells break; 60331143d5dSDavid Howells } 60431143d5dSDavid Howells 60531143d5dSDavid Howells _leave(" = %d", ret); 60631143d5dSDavid Howells return ret; 60731143d5dSDavid Howells } 60831143d5dSDavid Howells 60931143d5dSDavid Howells /* 61031143d5dSDavid Howells * write a page back to the server 61131143d5dSDavid Howells * - the caller locked the page for us 61231143d5dSDavid Howells */ 61331143d5dSDavid Howells int afs_writepage(struct page *page, struct writeback_control *wbc) 61431143d5dSDavid Howells { 61531143d5dSDavid Howells int ret; 61631143d5dSDavid Howells 61731143d5dSDavid Howells _enter("{%lx},", page->index); 61831143d5dSDavid Howells 6194343d008SDavid Howells ret = afs_write_back_from_locked_page(page->mapping, wbc, page, 6204343d008SDavid Howells wbc->range_end >> PAGE_SHIFT); 62131143d5dSDavid Howells if (ret < 0) { 62231143d5dSDavid Howells _leave(" = %d", ret); 62331143d5dSDavid Howells return 0; 62431143d5dSDavid Howells } 62531143d5dSDavid Howells 62631143d5dSDavid Howells wbc->nr_to_write -= ret; 62731143d5dSDavid Howells 62831143d5dSDavid Howells _leave(" = 0"); 62931143d5dSDavid Howells return 0; 63031143d5dSDavid Howells } 63131143d5dSDavid Howells 63231143d5dSDavid Howells /* 63331143d5dSDavid Howells * write a region of pages back to the server 63431143d5dSDavid Howells */ 635c1206a2cSAdrian Bunk static int afs_writepages_region(struct address_space *mapping, 63631143d5dSDavid Howells struct writeback_control *wbc, 63731143d5dSDavid Howells pgoff_t index, pgoff_t end, pgoff_t *_next) 63831143d5dSDavid Howells { 63931143d5dSDavid Howells struct page *page; 64031143d5dSDavid Howells int ret, n; 64131143d5dSDavid Howells 64231143d5dSDavid Howells _enter(",,%lx,%lx,", index, end); 64331143d5dSDavid Howells 64431143d5dSDavid Howells do { 645aef6e415SJan Kara n = find_get_pages_range_tag(mapping, &index, end, 646aef6e415SJan Kara PAGECACHE_TAG_DIRTY, 1, &page); 64731143d5dSDavid Howells if (!n) 64831143d5dSDavid Howells break; 64931143d5dSDavid Howells 65031143d5dSDavid Howells _debug("wback %lx", page->index); 65131143d5dSDavid Howells 652b93b0163SMatthew Wilcox /* 653b93b0163SMatthew Wilcox * at this point we hold neither the i_pages lock nor the 654b93b0163SMatthew Wilcox * page lock: the page may be truncated or invalidated 655b93b0163SMatthew Wilcox * (changing page->mapping to NULL), or even swizzled 656b93b0163SMatthew Wilcox * back from swapper_space to tmpfs file mapping 65731143d5dSDavid Howells */ 6584343d008SDavid Howells ret = lock_page_killable(page); 6594343d008SDavid Howells if (ret < 0) { 6604343d008SDavid Howells put_page(page); 6614343d008SDavid Howells _leave(" = %d", ret); 6624343d008SDavid Howells return ret; 6634343d008SDavid Howells } 66431143d5dSDavid Howells 665c5051c7bSDavid Howells if (page->mapping != mapping || !PageDirty(page)) { 66631143d5dSDavid Howells unlock_page(page); 66709cbfeafSKirill A. Shutemov put_page(page); 66831143d5dSDavid Howells continue; 66931143d5dSDavid Howells } 67031143d5dSDavid Howells 671c5051c7bSDavid Howells if (PageWriteback(page)) { 672c5051c7bSDavid Howells unlock_page(page); 67331143d5dSDavid Howells if (wbc->sync_mode != WB_SYNC_NONE) 67431143d5dSDavid Howells wait_on_page_writeback(page); 67529c8bbbdSDavid Howells put_page(page); 67631143d5dSDavid Howells continue; 67731143d5dSDavid Howells } 67831143d5dSDavid Howells 67965a15109SDavid Howells if (!clear_page_dirty_for_io(page)) 68065a15109SDavid Howells BUG(); 6814343d008SDavid Howells ret = afs_write_back_from_locked_page(mapping, wbc, page, end); 68209cbfeafSKirill A. Shutemov put_page(page); 68331143d5dSDavid Howells if (ret < 0) { 68431143d5dSDavid Howells _leave(" = %d", ret); 68531143d5dSDavid Howells return ret; 68631143d5dSDavid Howells } 68731143d5dSDavid Howells 68831143d5dSDavid Howells wbc->nr_to_write -= ret; 68931143d5dSDavid Howells 69031143d5dSDavid Howells cond_resched(); 69131143d5dSDavid Howells } while (index < end && wbc->nr_to_write > 0); 69231143d5dSDavid Howells 69331143d5dSDavid Howells *_next = index; 69431143d5dSDavid Howells _leave(" = 0 [%lx]", *_next); 69531143d5dSDavid Howells return 0; 69631143d5dSDavid Howells } 69731143d5dSDavid Howells 69831143d5dSDavid Howells /* 69931143d5dSDavid Howells * write some of the pending data back to the server 70031143d5dSDavid Howells */ 70131143d5dSDavid Howells int afs_writepages(struct address_space *mapping, 70231143d5dSDavid Howells struct writeback_control *wbc) 70331143d5dSDavid Howells { 70431143d5dSDavid Howells pgoff_t start, end, next; 70531143d5dSDavid Howells int ret; 70631143d5dSDavid Howells 70731143d5dSDavid Howells _enter(""); 70831143d5dSDavid Howells 70931143d5dSDavid Howells if (wbc->range_cyclic) { 71031143d5dSDavid Howells start = mapping->writeback_index; 71131143d5dSDavid Howells end = -1; 71231143d5dSDavid Howells ret = afs_writepages_region(mapping, wbc, start, end, &next); 7131b430beeSWu Fengguang if (start > 0 && wbc->nr_to_write > 0 && ret == 0) 71431143d5dSDavid Howells ret = afs_writepages_region(mapping, wbc, 0, start, 71531143d5dSDavid Howells &next); 71631143d5dSDavid Howells mapping->writeback_index = next; 71731143d5dSDavid Howells } else if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) { 71809cbfeafSKirill A. Shutemov end = (pgoff_t)(LLONG_MAX >> PAGE_SHIFT); 71931143d5dSDavid Howells ret = afs_writepages_region(mapping, wbc, 0, end, &next); 72031143d5dSDavid Howells if (wbc->nr_to_write > 0) 72131143d5dSDavid Howells mapping->writeback_index = next; 72231143d5dSDavid Howells } else { 72309cbfeafSKirill A. Shutemov start = wbc->range_start >> PAGE_SHIFT; 72409cbfeafSKirill A. Shutemov end = wbc->range_end >> PAGE_SHIFT; 72531143d5dSDavid Howells ret = afs_writepages_region(mapping, wbc, start, end, &next); 72631143d5dSDavid Howells } 72731143d5dSDavid Howells 72831143d5dSDavid Howells _leave(" = %d", ret); 72931143d5dSDavid Howells return ret; 73031143d5dSDavid Howells } 73131143d5dSDavid Howells 73231143d5dSDavid Howells /* 73331143d5dSDavid Howells * write to an AFS file 73431143d5dSDavid Howells */ 73550b5551dSAl Viro ssize_t afs_file_write(struct kiocb *iocb, struct iov_iter *from) 73631143d5dSDavid Howells { 737496ad9aaSAl Viro struct afs_vnode *vnode = AFS_FS_I(file_inode(iocb->ki_filp)); 73831143d5dSDavid Howells ssize_t result; 73950b5551dSAl Viro size_t count = iov_iter_count(from); 74031143d5dSDavid Howells 7413b6492dfSDavid Howells _enter("{%llx:%llu},{%zu},", 74250b5551dSAl Viro vnode->fid.vid, vnode->fid.vnode, count); 74331143d5dSDavid Howells 74431143d5dSDavid Howells if (IS_SWAPFILE(&vnode->vfs_inode)) { 74531143d5dSDavid Howells printk(KERN_INFO 74631143d5dSDavid Howells "AFS: Attempt to write to active swap file!\n"); 74731143d5dSDavid Howells return -EBUSY; 74831143d5dSDavid Howells } 74931143d5dSDavid Howells 75031143d5dSDavid Howells if (!count) 75131143d5dSDavid Howells return 0; 75231143d5dSDavid Howells 75350b5551dSAl Viro result = generic_file_write_iter(iocb, from); 75431143d5dSDavid Howells 75531143d5dSDavid Howells _leave(" = %zd", result); 75631143d5dSDavid Howells return result; 75731143d5dSDavid Howells } 75831143d5dSDavid Howells 75931143d5dSDavid Howells /* 76031143d5dSDavid Howells * flush any dirty pages for this process, and check for write errors. 76131143d5dSDavid Howells * - the return status from this call provides a reliable indication of 76231143d5dSDavid Howells * whether any write errors occurred for this process. 76331143d5dSDavid Howells */ 76402c24a82SJosef Bacik int afs_fsync(struct file *file, loff_t start, loff_t end, int datasync) 76531143d5dSDavid Howells { 7663c981bfcSAl Viro struct inode *inode = file_inode(file); 7673c981bfcSAl Viro struct afs_vnode *vnode = AFS_FS_I(inode); 76831143d5dSDavid Howells 7693b6492dfSDavid Howells _enter("{%llx:%llu},{n=%pD},%d", 7703c981bfcSAl Viro vnode->fid.vid, vnode->fid.vnode, file, 77131143d5dSDavid Howells datasync); 77231143d5dSDavid Howells 7734343d008SDavid Howells return file_write_and_wait_range(file, start, end); 77431143d5dSDavid Howells } 7759b3f26c9SDavid Howells 7769b3f26c9SDavid Howells /* 7779b3f26c9SDavid Howells * notification that a previously read-only page is about to become writable 7789b3f26c9SDavid Howells * - if it returns an error, the caller will deliver a bus error signal 7799b3f26c9SDavid Howells */ 7800722f186SSouptick Joarder vm_fault_t afs_page_mkwrite(struct vm_fault *vmf) 7819b3f26c9SDavid Howells { 7821cf7a151SDavid Howells struct file *file = vmf->vma->vm_file; 7831cf7a151SDavid Howells struct inode *inode = file_inode(file); 7841cf7a151SDavid Howells struct afs_vnode *vnode = AFS_FS_I(inode); 7851cf7a151SDavid Howells unsigned long priv; 7869b3f26c9SDavid Howells 7873b6492dfSDavid Howells _enter("{{%llx:%llu}},{%lx}", 7881cf7a151SDavid Howells vnode->fid.vid, vnode->fid.vnode, vmf->page->index); 7899b3f26c9SDavid Howells 7901cf7a151SDavid Howells sb_start_pagefault(inode->i_sb); 7911cf7a151SDavid Howells 7921cf7a151SDavid Howells /* Wait for the page to be written to the cache before we allow it to 7931cf7a151SDavid Howells * be modified. We then assume the entire page will need writing back. 7941cf7a151SDavid Howells */ 7959b3f26c9SDavid Howells #ifdef CONFIG_AFS_FSCACHE 7961cf7a151SDavid Howells fscache_wait_on_page_write(vnode->cache, vmf->page); 7979b3f26c9SDavid Howells #endif 7989b3f26c9SDavid Howells 7991cf7a151SDavid Howells if (PageWriteback(vmf->page) && 8001cf7a151SDavid Howells wait_on_page_bit_killable(vmf->page, PG_writeback) < 0) 8011cf7a151SDavid Howells return VM_FAULT_RETRY; 8021cf7a151SDavid Howells 8031cf7a151SDavid Howells if (lock_page_killable(vmf->page) < 0) 8041cf7a151SDavid Howells return VM_FAULT_RETRY; 8051cf7a151SDavid Howells 8061cf7a151SDavid Howells /* We mustn't change page->private until writeback is complete as that 8071cf7a151SDavid Howells * details the portion of the page we need to write back and we might 8081cf7a151SDavid Howells * need to redirty the page if there's a problem. 8091cf7a151SDavid Howells */ 8101cf7a151SDavid Howells wait_on_page_writeback(vmf->page); 8111cf7a151SDavid Howells 8121cf7a151SDavid Howells priv = (unsigned long)PAGE_SIZE << AFS_PRIV_SHIFT; /* To */ 8131cf7a151SDavid Howells priv |= 0; /* From */ 81413524ab3SDavid Howells trace_afs_page_dirty(vnode, tracepoint_string("mkwrite"), 81513524ab3SDavid Howells vmf->page->index, priv); 8161cf7a151SDavid Howells SetPagePrivate(vmf->page); 8171cf7a151SDavid Howells set_page_private(vmf->page, priv); 8181cf7a151SDavid Howells 8191cf7a151SDavid Howells sb_end_pagefault(inode->i_sb); 8201cf7a151SDavid Howells return VM_FAULT_LOCKED; 8219b3f26c9SDavid Howells } 8224343d008SDavid Howells 8234343d008SDavid Howells /* 8244343d008SDavid Howells * Prune the keys cached for writeback. The caller must hold vnode->wb_lock. 8254343d008SDavid Howells */ 8264343d008SDavid Howells void afs_prune_wb_keys(struct afs_vnode *vnode) 8274343d008SDavid Howells { 8284343d008SDavid Howells LIST_HEAD(graveyard); 8294343d008SDavid Howells struct afs_wb_key *wbk, *tmp; 8304343d008SDavid Howells 8314343d008SDavid Howells /* Discard unused keys */ 8324343d008SDavid Howells spin_lock(&vnode->wb_lock); 8334343d008SDavid Howells 8344343d008SDavid Howells if (!mapping_tagged(&vnode->vfs_inode.i_data, PAGECACHE_TAG_WRITEBACK) && 8354343d008SDavid Howells !mapping_tagged(&vnode->vfs_inode.i_data, PAGECACHE_TAG_DIRTY)) { 8364343d008SDavid Howells list_for_each_entry_safe(wbk, tmp, &vnode->wb_keys, vnode_link) { 8374343d008SDavid Howells if (refcount_read(&wbk->usage) == 1) 8384343d008SDavid Howells list_move(&wbk->vnode_link, &graveyard); 8394343d008SDavid Howells } 8404343d008SDavid Howells } 8414343d008SDavid Howells 8424343d008SDavid Howells spin_unlock(&vnode->wb_lock); 8434343d008SDavid Howells 8444343d008SDavid Howells while (!list_empty(&graveyard)) { 8454343d008SDavid Howells wbk = list_entry(graveyard.next, struct afs_wb_key, vnode_link); 8464343d008SDavid Howells list_del(&wbk->vnode_link); 8474343d008SDavid Howells afs_put_wb_key(wbk); 8484343d008SDavid Howells } 8494343d008SDavid Howells } 8504343d008SDavid Howells 8514343d008SDavid Howells /* 8524343d008SDavid Howells * Clean up a page during invalidation. 8534343d008SDavid Howells */ 8544343d008SDavid Howells int afs_launder_page(struct page *page) 8554343d008SDavid Howells { 8564343d008SDavid Howells struct address_space *mapping = page->mapping; 8574343d008SDavid Howells struct afs_vnode *vnode = AFS_FS_I(mapping->host); 8584343d008SDavid Howells unsigned long priv; 8594343d008SDavid Howells unsigned int f, t; 8604343d008SDavid Howells int ret = 0; 8614343d008SDavid Howells 8624343d008SDavid Howells _enter("{%lx}", page->index); 8634343d008SDavid Howells 8644343d008SDavid Howells priv = page_private(page); 8654343d008SDavid Howells if (clear_page_dirty_for_io(page)) { 8664343d008SDavid Howells f = 0; 8674343d008SDavid Howells t = PAGE_SIZE; 8684343d008SDavid Howells if (PagePrivate(page)) { 8694343d008SDavid Howells f = priv & AFS_PRIV_MAX; 8704343d008SDavid Howells t = priv >> AFS_PRIV_SHIFT; 8714343d008SDavid Howells } 8724343d008SDavid Howells 87313524ab3SDavid Howells trace_afs_page_dirty(vnode, tracepoint_string("launder"), 87413524ab3SDavid Howells page->index, priv); 8754343d008SDavid Howells ret = afs_store_data(mapping, page->index, page->index, t, f); 8764343d008SDavid Howells } 8774343d008SDavid Howells 87813524ab3SDavid Howells trace_afs_page_dirty(vnode, tracepoint_string("laundered"), 87913524ab3SDavid Howells page->index, priv); 8804343d008SDavid Howells set_page_private(page, 0); 8814343d008SDavid Howells ClearPagePrivate(page); 8824343d008SDavid Howells 8834343d008SDavid Howells #ifdef CONFIG_AFS_FSCACHE 8844343d008SDavid Howells if (PageFsCache(page)) { 8854343d008SDavid Howells fscache_wait_on_page_write(vnode->cache, page); 8864343d008SDavid Howells fscache_uncache_page(vnode->cache, page); 8874343d008SDavid Howells } 8884343d008SDavid Howells #endif 8894343d008SDavid Howells return ret; 89031143d5dSDavid Howells } 891