Thomas Gleixner | 2874c5f | 2019-05-27 08:55:01 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 2 | /* handling of writes to regular files and writing back to the server |
| 3 | * |
| 4 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. |
| 5 | * Written by David Howells (dhowells@redhat.com) |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 6 | */ |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 7 | |
Alexey Dobriyan | 4af3c9c | 2007-10-16 23:29:23 -0700 | [diff] [blame] | 8 | #include <linux/backing-dev.h> |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 9 | #include <linux/slab.h> |
| 10 | #include <linux/fs.h> |
| 11 | #include <linux/pagemap.h> |
| 12 | #include <linux/writeback.h> |
| 13 | #include <linux/pagevec.h> |
| 14 | #include "internal.h" |
| 15 | |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 16 | /* |
| 17 | * mark a page as having been made dirty and thus needing writeback |
| 18 | */ |
| 19 | int afs_set_page_dirty(struct page *page) |
| 20 | { |
| 21 | _enter(""); |
| 22 | return __set_page_dirty_nobuffers(page); |
| 23 | } |
| 24 | |
| 25 | /* |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 26 | * partly or wholly fill a page that's under preparation for writing |
| 27 | */ |
| 28 | static int afs_fill_page(struct afs_vnode *vnode, struct key *key, |
David Howells | e8e581a | 2017-03-16 16:27:44 +0000 | [diff] [blame] | 29 | loff_t pos, unsigned int len, struct page *page) |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 30 | { |
David Howells | 196ee9c | 2017-01-05 10:38:34 +0000 | [diff] [blame] | 31 | struct afs_read *req; |
David Howells | 2a0b4f6 | 2018-10-20 00:57:57 +0100 | [diff] [blame] | 32 | size_t p; |
| 33 | void *data; |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 34 | int ret; |
| 35 | |
Anton Blanchard | 5e7f233 | 2011-06-13 22:31:12 +0100 | [diff] [blame] | 36 | _enter(",,%llu", (unsigned long long)pos); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 37 | |
David Howells | 2a0b4f6 | 2018-10-20 00:57:57 +0100 | [diff] [blame] | 38 | if (pos >= vnode->vfs_inode.i_size) { |
| 39 | p = pos & ~PAGE_MASK; |
| 40 | ASSERTCMP(p + len, <=, PAGE_SIZE); |
| 41 | data = kmap(page); |
| 42 | memset(data + p, 0, len); |
| 43 | kunmap(page); |
| 44 | return 0; |
| 45 | } |
| 46 | |
Zhengyuan Liu | ee10258 | 2019-06-20 18:12:17 +0100 | [diff] [blame] | 47 | req = kzalloc(struct_size(req, array, 1), GFP_KERNEL); |
David Howells | 196ee9c | 2017-01-05 10:38:34 +0000 | [diff] [blame] | 48 | if (!req) |
| 49 | return -ENOMEM; |
| 50 | |
David Howells | f3ddee8 | 2018-04-06 14:17:25 +0100 | [diff] [blame] | 51 | refcount_set(&req->usage, 1); |
David Howells | 196ee9c | 2017-01-05 10:38:34 +0000 | [diff] [blame] | 52 | req->pos = pos; |
David Howells | e8e581a | 2017-03-16 16:27:44 +0000 | [diff] [blame] | 53 | req->len = len; |
David Howells | 196ee9c | 2017-01-05 10:38:34 +0000 | [diff] [blame] | 54 | req->nr_pages = 1; |
David Howells | f3ddee8 | 2018-04-06 14:17:25 +0100 | [diff] [blame] | 55 | req->pages = req->array; |
David Howells | 196ee9c | 2017-01-05 10:38:34 +0000 | [diff] [blame] | 56 | req->pages[0] = page; |
David Howells | 5611ef2 | 2017-03-16 16:27:43 +0000 | [diff] [blame] | 57 | get_page(page); |
David Howells | 196ee9c | 2017-01-05 10:38:34 +0000 | [diff] [blame] | 58 | |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 59 | ret = afs_fetch_data(vnode, key, req); |
David Howells | 196ee9c | 2017-01-05 10:38:34 +0000 | [diff] [blame] | 60 | afs_put_read(req); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 61 | if (ret < 0) { |
| 62 | if (ret == -ENOENT) { |
| 63 | _debug("got NOENT from server" |
| 64 | " - marking file deleted and stale"); |
| 65 | set_bit(AFS_VNODE_DELETED, &vnode->flags); |
| 66 | ret = -ESTALE; |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | _leave(" = %d", ret); |
| 71 | return ret; |
| 72 | } |
| 73 | |
| 74 | /* |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 75 | * prepare to perform part of a write to a page |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 76 | */ |
Nick Piggin | 15b4650 | 2008-10-15 22:04:32 -0700 | [diff] [blame] | 77 | int afs_write_begin(struct file *file, struct address_space *mapping, |
| 78 | loff_t pos, unsigned len, unsigned flags, |
| 79 | struct page **pagep, void **fsdata) |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 80 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 81 | struct afs_vnode *vnode = AFS_FS_I(file_inode(file)); |
Nick Piggin | 15b4650 | 2008-10-15 22:04:32 -0700 | [diff] [blame] | 82 | struct page *page; |
David Howells | 215804a | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 83 | struct key *key = afs_file_key(file); |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 84 | unsigned long priv; |
| 85 | unsigned f, from = pos & (PAGE_SIZE - 1); |
| 86 | unsigned t, to = from + len; |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 87 | pgoff_t index = pos >> PAGE_SHIFT; |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 88 | int ret; |
| 89 | |
David Howells | 3b6492d | 2018-10-20 00:57:57 +0100 | [diff] [blame] | 90 | _enter("{%llx:%llu},{%lx},%u,%u", |
Nick Piggin | 15b4650 | 2008-10-15 22:04:32 -0700 | [diff] [blame] | 91 | vnode->fid.vid, vnode->fid.vnode, index, from, to); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 92 | |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 93 | /* We want to store information about how much of a page is altered in |
| 94 | * page->private. |
| 95 | */ |
| 96 | BUILD_BUG_ON(PAGE_SIZE > 32768 && sizeof(page->private) < 8); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 97 | |
Nick Piggin | 54566b2 | 2009-01-04 12:00:53 -0800 | [diff] [blame] | 98 | page = grab_cache_page_write_begin(mapping, index, flags); |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 99 | if (!page) |
Nick Piggin | 15b4650 | 2008-10-15 22:04:32 -0700 | [diff] [blame] | 100 | return -ENOMEM; |
Nick Piggin | 15b4650 | 2008-10-15 22:04:32 -0700 | [diff] [blame] | 101 | |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 102 | if (!PageUptodate(page) && len != PAGE_SIZE) { |
David Howells | e8e581a | 2017-03-16 16:27:44 +0000 | [diff] [blame] | 103 | ret = afs_fill_page(vnode, key, pos & PAGE_MASK, PAGE_SIZE, page); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 104 | if (ret < 0) { |
David Howells | 6d06b0d | 2017-03-16 16:27:48 +0000 | [diff] [blame] | 105 | unlock_page(page); |
| 106 | put_page(page); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 107 | _leave(" = %d [prep]", ret); |
| 108 | return ret; |
| 109 | } |
Nick Piggin | 15b4650 | 2008-10-15 22:04:32 -0700 | [diff] [blame] | 110 | SetPageUptodate(page); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 111 | } |
| 112 | |
David Howells | 6d06b0d | 2017-03-16 16:27:48 +0000 | [diff] [blame] | 113 | /* page won't leak in error case: it eventually gets cleaned off LRU */ |
| 114 | *pagep = page; |
| 115 | |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 116 | try_again: |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 117 | /* See if this page is already partially written in a way that we can |
| 118 | * merge the new write with. |
| 119 | */ |
| 120 | t = f = 0; |
| 121 | if (PagePrivate(page)) { |
| 122 | priv = page_private(page); |
| 123 | f = priv & AFS_PRIV_MAX; |
| 124 | t = priv >> AFS_PRIV_SHIFT; |
| 125 | ASSERTCMP(f, <=, t); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 126 | } |
| 127 | |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 128 | if (f != t) { |
David Howells | 5a039c3 | 2017-11-18 00:13:30 +0000 | [diff] [blame] | 129 | if (PageWriteback(page)) { |
| 130 | trace_afs_page_dirty(vnode, tracepoint_string("alrdy"), |
| 131 | page->index, priv); |
| 132 | goto flush_conflicting_write; |
| 133 | } |
David Howells | 5a81327 | 2018-04-06 14:17:26 +0100 | [diff] [blame] | 134 | /* If the file is being filled locally, allow inter-write |
| 135 | * spaces to be merged into writes. If it's not, only write |
| 136 | * back what the user gives us. |
| 137 | */ |
| 138 | if (!test_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags) && |
| 139 | (to < f || from > t)) |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 140 | goto flush_conflicting_write; |
| 141 | if (from < f) |
| 142 | f = from; |
| 143 | if (to > t) |
| 144 | t = to; |
| 145 | } else { |
| 146 | f = from; |
| 147 | t = to; |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 148 | } |
| 149 | |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 150 | priv = (unsigned long)t << AFS_PRIV_SHIFT; |
| 151 | priv |= f; |
David Howells | 13524ab | 2017-11-02 15:27:53 +0000 | [diff] [blame] | 152 | trace_afs_page_dirty(vnode, tracepoint_string("begin"), |
| 153 | page->index, priv); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 154 | SetPagePrivate(page); |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 155 | set_page_private(page, priv); |
| 156 | _leave(" = 0"); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 157 | return 0; |
| 158 | |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 159 | /* The previous write and this write aren't adjacent or overlapping, so |
| 160 | * flush the page out. |
| 161 | */ |
| 162 | flush_conflicting_write: |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 163 | _debug("flush conflict"); |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 164 | ret = write_one_page(page); |
| 165 | if (ret < 0) { |
| 166 | _leave(" = %d", ret); |
| 167 | return ret; |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 168 | } |
| 169 | |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 170 | ret = lock_page_killable(page); |
| 171 | if (ret < 0) { |
| 172 | _leave(" = %d", ret); |
| 173 | return ret; |
| 174 | } |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 175 | goto try_again; |
| 176 | } |
| 177 | |
| 178 | /* |
| 179 | * finalise part of a write to a page |
| 180 | */ |
Nick Piggin | 15b4650 | 2008-10-15 22:04:32 -0700 | [diff] [blame] | 181 | int afs_write_end(struct file *file, struct address_space *mapping, |
| 182 | loff_t pos, unsigned len, unsigned copied, |
| 183 | struct page *page, void *fsdata) |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 184 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 185 | struct afs_vnode *vnode = AFS_FS_I(file_inode(file)); |
David Howells | 215804a | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 186 | struct key *key = afs_file_key(file); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 187 | loff_t i_size, maybe_i_size; |
David Howells | e8e581a | 2017-03-16 16:27:44 +0000 | [diff] [blame] | 188 | int ret; |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 189 | |
David Howells | 3b6492d | 2018-10-20 00:57:57 +0100 | [diff] [blame] | 190 | _enter("{%llx:%llu},{%lx}", |
Nick Piggin | 15b4650 | 2008-10-15 22:04:32 -0700 | [diff] [blame] | 191 | vnode->fid.vid, vnode->fid.vnode, page->index); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 192 | |
Nick Piggin | 15b4650 | 2008-10-15 22:04:32 -0700 | [diff] [blame] | 193 | maybe_i_size = pos + copied; |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 194 | |
| 195 | i_size = i_size_read(&vnode->vfs_inode); |
| 196 | if (maybe_i_size > i_size) { |
David Howells | 1f32ef7 | 2020-06-12 23:58:51 +0100 | [diff] [blame] | 197 | write_seqlock(&vnode->cb_lock); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 198 | i_size = i_size_read(&vnode->vfs_inode); |
| 199 | if (maybe_i_size > i_size) |
| 200 | i_size_write(&vnode->vfs_inode, maybe_i_size); |
David Howells | 1f32ef7 | 2020-06-12 23:58:51 +0100 | [diff] [blame] | 201 | write_sequnlock(&vnode->cb_lock); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 202 | } |
| 203 | |
David Howells | e8e581a | 2017-03-16 16:27:44 +0000 | [diff] [blame] | 204 | if (!PageUptodate(page)) { |
| 205 | if (copied < len) { |
| 206 | /* Try and load any missing data from the server. The |
| 207 | * unmarshalling routine will take care of clearing any |
| 208 | * bits that are beyond the EOF. |
| 209 | */ |
| 210 | ret = afs_fill_page(vnode, key, pos + copied, |
| 211 | len - copied, page); |
| 212 | if (ret < 0) |
David Howells | afae457 | 2018-01-02 10:02:19 +0000 | [diff] [blame] | 213 | goto out; |
David Howells | e8e581a | 2017-03-16 16:27:44 +0000 | [diff] [blame] | 214 | } |
| 215 | SetPageUptodate(page); |
| 216 | } |
| 217 | |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 218 | set_page_dirty(page); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 219 | if (PageDirty(page)) |
| 220 | _debug("dirtied"); |
David Howells | afae457 | 2018-01-02 10:02:19 +0000 | [diff] [blame] | 221 | ret = copied; |
| 222 | |
| 223 | out: |
Nick Piggin | 15b4650 | 2008-10-15 22:04:32 -0700 | [diff] [blame] | 224 | unlock_page(page); |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 225 | put_page(page); |
David Howells | afae457 | 2018-01-02 10:02:19 +0000 | [diff] [blame] | 226 | return ret; |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 227 | } |
| 228 | |
| 229 | /* |
| 230 | * kill all the pages in the given range |
| 231 | */ |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 232 | static void afs_kill_pages(struct address_space *mapping, |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 233 | pgoff_t first, pgoff_t last) |
| 234 | { |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 235 | struct afs_vnode *vnode = AFS_FS_I(mapping->host); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 236 | struct pagevec pv; |
| 237 | unsigned count, loop; |
| 238 | |
David Howells | 3b6492d | 2018-10-20 00:57:57 +0100 | [diff] [blame] | 239 | _enter("{%llx:%llu},%lx-%lx", |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 240 | vnode->fid.vid, vnode->fid.vnode, first, last); |
| 241 | |
Mel Gorman | 8667982 | 2017-11-15 17:37:52 -0800 | [diff] [blame] | 242 | pagevec_init(&pv); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 243 | |
| 244 | do { |
| 245 | _debug("kill %lx-%lx", first, last); |
| 246 | |
| 247 | count = last - first + 1; |
| 248 | if (count > PAGEVEC_SIZE) |
| 249 | count = PAGEVEC_SIZE; |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 250 | pv.nr = find_get_pages_contig(mapping, first, count, pv.pages); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 251 | ASSERTCMP(pv.nr, ==, count); |
| 252 | |
| 253 | for (loop = 0; loop < count; loop++) { |
David Howells | 7286a35 | 2017-03-16 16:27:48 +0000 | [diff] [blame] | 254 | struct page *page = pv.pages[loop]; |
| 255 | ClearPageUptodate(page); |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 256 | SetPageError(page); |
| 257 | end_page_writeback(page); |
David Howells | 7286a35 | 2017-03-16 16:27:48 +0000 | [diff] [blame] | 258 | if (page->index >= first) |
| 259 | first = page->index + 1; |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 260 | lock_page(page); |
| 261 | generic_error_remove_page(mapping, page); |
Marc Dionne | 21bd68f | 2019-04-13 08:37:37 +0100 | [diff] [blame] | 262 | unlock_page(page); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 263 | } |
| 264 | |
| 265 | __pagevec_release(&pv); |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 266 | } while (first <= last); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 267 | |
| 268 | _leave(""); |
| 269 | } |
| 270 | |
| 271 | /* |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 272 | * Redirty all the pages in a given range. |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 273 | */ |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 274 | static void afs_redirty_pages(struct writeback_control *wbc, |
| 275 | struct address_space *mapping, |
| 276 | pgoff_t first, pgoff_t last) |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 277 | { |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 278 | struct afs_vnode *vnode = AFS_FS_I(mapping->host); |
| 279 | struct pagevec pv; |
| 280 | unsigned count, loop; |
| 281 | |
David Howells | 3b6492d | 2018-10-20 00:57:57 +0100 | [diff] [blame] | 282 | _enter("{%llx:%llu},%lx-%lx", |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 283 | vnode->fid.vid, vnode->fid.vnode, first, last); |
| 284 | |
Linus Torvalds | 487e2c9 | 2017-11-16 11:41:22 -0800 | [diff] [blame] | 285 | pagevec_init(&pv); |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 286 | |
| 287 | do { |
| 288 | _debug("redirty %lx-%lx", first, last); |
| 289 | |
| 290 | count = last - first + 1; |
| 291 | if (count > PAGEVEC_SIZE) |
| 292 | count = PAGEVEC_SIZE; |
| 293 | pv.nr = find_get_pages_contig(mapping, first, count, pv.pages); |
| 294 | ASSERTCMP(pv.nr, ==, count); |
| 295 | |
| 296 | for (loop = 0; loop < count; loop++) { |
| 297 | struct page *page = pv.pages[loop]; |
| 298 | |
| 299 | redirty_page_for_writepage(wbc, page); |
| 300 | end_page_writeback(page); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 301 | if (page->index >= first) |
| 302 | first = page->index + 1; |
| 303 | } |
| 304 | |
| 305 | __pagevec_release(&pv); |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 306 | } while (first <= last); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 307 | |
| 308 | _leave(""); |
| 309 | } |
| 310 | |
| 311 | /* |
David Howells | a58823a | 2019-05-09 15:16:10 +0100 | [diff] [blame] | 312 | * completion of write to server |
| 313 | */ |
| 314 | static void afs_pages_written_back(struct afs_vnode *vnode, |
| 315 | pgoff_t first, pgoff_t last) |
| 316 | { |
| 317 | struct pagevec pv; |
| 318 | unsigned long priv; |
| 319 | unsigned count, loop; |
| 320 | |
| 321 | _enter("{%llx:%llu},{%lx-%lx}", |
| 322 | vnode->fid.vid, vnode->fid.vnode, first, last); |
| 323 | |
| 324 | pagevec_init(&pv); |
| 325 | |
| 326 | do { |
| 327 | _debug("done %lx-%lx", first, last); |
| 328 | |
| 329 | count = last - first + 1; |
| 330 | if (count > PAGEVEC_SIZE) |
| 331 | count = PAGEVEC_SIZE; |
| 332 | pv.nr = find_get_pages_contig(vnode->vfs_inode.i_mapping, |
| 333 | first, count, pv.pages); |
| 334 | ASSERTCMP(pv.nr, ==, count); |
| 335 | |
| 336 | for (loop = 0; loop < count; loop++) { |
| 337 | priv = page_private(pv.pages[loop]); |
| 338 | trace_afs_page_dirty(vnode, tracepoint_string("clear"), |
| 339 | pv.pages[loop]->index, priv); |
| 340 | set_page_private(pv.pages[loop], 0); |
| 341 | end_page_writeback(pv.pages[loop]); |
| 342 | } |
| 343 | first += count; |
| 344 | __pagevec_release(&pv); |
| 345 | } while (first <= last); |
| 346 | |
| 347 | afs_prune_wb_keys(vnode); |
| 348 | _leave(""); |
| 349 | } |
| 350 | |
| 351 | /* |
David Howells | e49c7b2 | 2020-04-10 20:51:51 +0100 | [diff] [blame] | 352 | * Find a key to use for the writeback. We cached the keys used to author the |
| 353 | * writes on the vnode. *_wbk will contain the last writeback key used or NULL |
| 354 | * and we need to start from there if it's set. |
| 355 | */ |
| 356 | static int afs_get_writeback_key(struct afs_vnode *vnode, |
| 357 | struct afs_wb_key **_wbk) |
| 358 | { |
| 359 | struct afs_wb_key *wbk = NULL; |
| 360 | struct list_head *p; |
| 361 | int ret = -ENOKEY, ret2; |
| 362 | |
| 363 | spin_lock(&vnode->wb_lock); |
| 364 | if (*_wbk) |
| 365 | p = (*_wbk)->vnode_link.next; |
| 366 | else |
| 367 | p = vnode->wb_keys.next; |
| 368 | |
| 369 | while (p != &vnode->wb_keys) { |
| 370 | wbk = list_entry(p, struct afs_wb_key, vnode_link); |
| 371 | _debug("wbk %u", key_serial(wbk->key)); |
| 372 | ret2 = key_validate(wbk->key); |
| 373 | if (ret2 == 0) { |
| 374 | refcount_inc(&wbk->usage); |
| 375 | _debug("USE WB KEY %u", key_serial(wbk->key)); |
| 376 | break; |
| 377 | } |
| 378 | |
| 379 | wbk = NULL; |
| 380 | if (ret == -ENOKEY) |
| 381 | ret = ret2; |
| 382 | p = p->next; |
| 383 | } |
| 384 | |
| 385 | spin_unlock(&vnode->wb_lock); |
| 386 | if (*_wbk) |
| 387 | afs_put_wb_key(*_wbk); |
| 388 | *_wbk = wbk; |
| 389 | return 0; |
| 390 | } |
| 391 | |
| 392 | static void afs_store_data_success(struct afs_operation *op) |
| 393 | { |
| 394 | struct afs_vnode *vnode = op->file[0].vnode; |
| 395 | |
David Howells | da8d075 | 2020-06-13 19:34:59 +0100 | [diff] [blame] | 396 | op->ctime = op->file[0].scb.status.mtime_client; |
David Howells | e49c7b2 | 2020-04-10 20:51:51 +0100 | [diff] [blame] | 397 | afs_vnode_commit_status(op, &op->file[0]); |
| 398 | if (op->error == 0) { |
| 399 | afs_pages_written_back(vnode, op->store.first, op->store.last); |
| 400 | afs_stat_v(vnode, n_stores); |
| 401 | atomic_long_add((op->store.last * PAGE_SIZE + op->store.last_to) - |
| 402 | (op->store.first * PAGE_SIZE + op->store.first_offset), |
| 403 | &afs_v2net(vnode)->n_store_bytes); |
| 404 | } |
| 405 | } |
| 406 | |
| 407 | static const struct afs_operation_ops afs_store_data_operation = { |
| 408 | .issue_afs_rpc = afs_fs_store_data, |
| 409 | .issue_yfs_rpc = yfs_fs_store_data, |
| 410 | .success = afs_store_data_success, |
| 411 | }; |
| 412 | |
| 413 | /* |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 414 | * write to a file |
| 415 | */ |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 416 | static int afs_store_data(struct address_space *mapping, |
| 417 | pgoff_t first, pgoff_t last, |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 418 | unsigned offset, unsigned to) |
| 419 | { |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 420 | struct afs_vnode *vnode = AFS_FS_I(mapping->host); |
David Howells | e49c7b2 | 2020-04-10 20:51:51 +0100 | [diff] [blame] | 421 | struct afs_operation *op; |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 422 | struct afs_wb_key *wbk = NULL; |
David Howells | e49c7b2 | 2020-04-10 20:51:51 +0100 | [diff] [blame] | 423 | int ret; |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 424 | |
David Howells | 3b6492d | 2018-10-20 00:57:57 +0100 | [diff] [blame] | 425 | _enter("%s{%llx:%llu.%u},%lx,%lx,%x,%x", |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 426 | vnode->volume->name, |
| 427 | vnode->fid.vid, |
| 428 | vnode->fid.vnode, |
| 429 | vnode->fid.unique, |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 430 | first, last, offset, to); |
| 431 | |
David Howells | e49c7b2 | 2020-04-10 20:51:51 +0100 | [diff] [blame] | 432 | ret = afs_get_writeback_key(vnode, &wbk); |
| 433 | if (ret) { |
| 434 | _leave(" = %d [no keys]", ret); |
| 435 | return ret; |
| 436 | } |
| 437 | |
| 438 | op = afs_alloc_operation(wbk->key, vnode->volume); |
| 439 | if (IS_ERR(op)) { |
| 440 | afs_put_wb_key(wbk); |
David Howells | a58823a | 2019-05-09 15:16:10 +0100 | [diff] [blame] | 441 | return -ENOMEM; |
David Howells | e49c7b2 | 2020-04-10 20:51:51 +0100 | [diff] [blame] | 442 | } |
David Howells | a58823a | 2019-05-09 15:16:10 +0100 | [diff] [blame] | 443 | |
David Howells | e49c7b2 | 2020-04-10 20:51:51 +0100 | [diff] [blame] | 444 | afs_op_set_vnode(op, 0, vnode); |
| 445 | op->file[0].dv_delta = 1; |
| 446 | op->store.mapping = mapping; |
| 447 | op->store.first = first; |
| 448 | op->store.last = last; |
| 449 | op->store.first_offset = offset; |
| 450 | op->store.last_to = to; |
David Howells | b359794 | 2020-06-11 21:50:24 +0100 | [diff] [blame] | 451 | op->mtime = vnode->vfs_inode.i_mtime; |
David Howells | 811f04b | 2020-07-08 09:27:07 +0100 | [diff] [blame] | 452 | op->flags |= AFS_OPERATION_UNINTR; |
David Howells | e49c7b2 | 2020-04-10 20:51:51 +0100 | [diff] [blame] | 453 | op->ops = &afs_store_data_operation; |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 454 | |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 455 | try_next_key: |
David Howells | e49c7b2 | 2020-04-10 20:51:51 +0100 | [diff] [blame] | 456 | afs_begin_vnode_operation(op); |
| 457 | afs_wait_for_operation(op); |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 458 | |
David Howells | e49c7b2 | 2020-04-10 20:51:51 +0100 | [diff] [blame] | 459 | switch (op->error) { |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 460 | case -EACCES: |
| 461 | case -EPERM: |
| 462 | case -ENOKEY: |
| 463 | case -EKEYEXPIRED: |
| 464 | case -EKEYREJECTED: |
| 465 | case -EKEYREVOKED: |
| 466 | _debug("next"); |
David Howells | e49c7b2 | 2020-04-10 20:51:51 +0100 | [diff] [blame] | 467 | |
| 468 | ret = afs_get_writeback_key(vnode, &wbk); |
| 469 | if (ret == 0) { |
| 470 | key_put(op->key); |
| 471 | op->key = key_get(wbk->key); |
| 472 | goto try_next_key; |
| 473 | } |
| 474 | break; |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 475 | } |
| 476 | |
| 477 | afs_put_wb_key(wbk); |
David Howells | e49c7b2 | 2020-04-10 20:51:51 +0100 | [diff] [blame] | 478 | _leave(" = %d", op->error); |
| 479 | return afs_put_operation(op); |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 480 | } |
| 481 | |
| 482 | /* |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 483 | * Synchronously write back the locked page and any subsequent non-locked dirty |
| 484 | * pages. |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 485 | */ |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 486 | static int afs_write_back_from_locked_page(struct address_space *mapping, |
| 487 | struct writeback_control *wbc, |
| 488 | struct page *primary_page, |
| 489 | pgoff_t final_page) |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 490 | { |
David Howells | 13524ab | 2017-11-02 15:27:53 +0000 | [diff] [blame] | 491 | struct afs_vnode *vnode = AFS_FS_I(mapping->host); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 492 | struct page *pages[8], *page; |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 493 | unsigned long count, priv; |
| 494 | unsigned n, offset, to, f, t; |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 495 | pgoff_t start, first, last; |
David Howells | 793fe82 | 2020-06-12 16:13:52 +0100 | [diff] [blame] | 496 | loff_t i_size, end; |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 497 | int loop, ret; |
| 498 | |
| 499 | _enter(",%lx", primary_page->index); |
| 500 | |
| 501 | count = 1; |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 502 | if (test_set_page_writeback(primary_page)) |
| 503 | BUG(); |
| 504 | |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 505 | /* Find all consecutive lockable dirty pages that have contiguous |
| 506 | * written regions, stopping when we find a page that is not |
| 507 | * immediately lockable, is not dirty or is missing, or we reach the |
| 508 | * end of the range. |
| 509 | */ |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 510 | start = primary_page->index; |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 511 | priv = page_private(primary_page); |
| 512 | offset = priv & AFS_PRIV_MAX; |
| 513 | to = priv >> AFS_PRIV_SHIFT; |
David Howells | 13524ab | 2017-11-02 15:27:53 +0000 | [diff] [blame] | 514 | trace_afs_page_dirty(vnode, tracepoint_string("store"), |
| 515 | primary_page->index, priv); |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 516 | |
| 517 | WARN_ON(offset == to); |
David Howells | 13524ab | 2017-11-02 15:27:53 +0000 | [diff] [blame] | 518 | if (offset == to) |
| 519 | trace_afs_page_dirty(vnode, tracepoint_string("WARN"), |
| 520 | primary_page->index, priv); |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 521 | |
David Howells | 5a81327 | 2018-04-06 14:17:26 +0100 | [diff] [blame] | 522 | if (start >= final_page || |
| 523 | (to < PAGE_SIZE && !test_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags))) |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 524 | goto no_more; |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 525 | |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 526 | start++; |
| 527 | do { |
| 528 | _debug("more %lx [%lx]", start, count); |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 529 | n = final_page - start + 1; |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 530 | if (n > ARRAY_SIZE(pages)) |
| 531 | n = ARRAY_SIZE(pages); |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 532 | n = find_get_pages_contig(mapping, start, ARRAY_SIZE(pages), pages); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 533 | _debug("fgpc %u", n); |
| 534 | if (n == 0) |
| 535 | goto no_more; |
| 536 | if (pages[0]->index != start) { |
David Howells | 9d577b6 | 2007-05-10 22:22:19 -0700 | [diff] [blame] | 537 | do { |
| 538 | put_page(pages[--n]); |
| 539 | } while (n > 0); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 540 | goto no_more; |
| 541 | } |
| 542 | |
| 543 | for (loop = 0; loop < n; loop++) { |
| 544 | page = pages[loop]; |
David Howells | 5a81327 | 2018-04-06 14:17:26 +0100 | [diff] [blame] | 545 | if (to != PAGE_SIZE && |
| 546 | !test_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags)) |
| 547 | break; |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 548 | if (page->index > final_page) |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 549 | break; |
Nick Piggin | 529ae9a | 2008-08-02 12:01:03 +0200 | [diff] [blame] | 550 | if (!trylock_page(page)) |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 551 | break; |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 552 | if (!PageDirty(page) || PageWriteback(page)) { |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 553 | unlock_page(page); |
| 554 | break; |
| 555 | } |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 556 | |
| 557 | priv = page_private(page); |
| 558 | f = priv & AFS_PRIV_MAX; |
| 559 | t = priv >> AFS_PRIV_SHIFT; |
David Howells | 5a81327 | 2018-04-06 14:17:26 +0100 | [diff] [blame] | 560 | if (f != 0 && |
| 561 | !test_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags)) { |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 562 | unlock_page(page); |
| 563 | break; |
| 564 | } |
| 565 | to = t; |
| 566 | |
David Howells | 13524ab | 2017-11-02 15:27:53 +0000 | [diff] [blame] | 567 | trace_afs_page_dirty(vnode, tracepoint_string("store+"), |
| 568 | page->index, priv); |
| 569 | |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 570 | if (!clear_page_dirty_for_io(page)) |
| 571 | BUG(); |
| 572 | if (test_set_page_writeback(page)) |
| 573 | BUG(); |
| 574 | unlock_page(page); |
| 575 | put_page(page); |
| 576 | } |
| 577 | count += loop; |
| 578 | if (loop < n) { |
| 579 | for (; loop < n; loop++) |
| 580 | put_page(pages[loop]); |
| 581 | goto no_more; |
| 582 | } |
| 583 | |
| 584 | start += loop; |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 585 | } while (start <= final_page && count < 65536); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 586 | |
| 587 | no_more: |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 588 | /* We now have a contiguous set of dirty pages, each with writeback |
| 589 | * set; the first page is still locked at this point, but all the rest |
| 590 | * have been unlocked. |
| 591 | */ |
| 592 | unlock_page(primary_page); |
| 593 | |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 594 | first = primary_page->index; |
| 595 | last = first + count - 1; |
| 596 | |
David Howells | 793fe82 | 2020-06-12 16:13:52 +0100 | [diff] [blame] | 597 | end = (loff_t)last * PAGE_SIZE + to; |
| 598 | i_size = i_size_read(&vnode->vfs_inode); |
| 599 | |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 600 | _debug("write back %lx[%u..] to %lx[..%u]", first, offset, last, to); |
David Howells | 793fe82 | 2020-06-12 16:13:52 +0100 | [diff] [blame] | 601 | if (end > i_size) |
| 602 | to = i_size & ~PAGE_MASK; |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 603 | |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 604 | ret = afs_store_data(mapping, first, last, offset, to); |
| 605 | switch (ret) { |
| 606 | case 0: |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 607 | ret = count; |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 608 | break; |
| 609 | |
| 610 | default: |
| 611 | pr_notice("kAFS: Unexpected error from FS.StoreData %d\n", ret); |
Gustavo A. R. Silva | df561f66 | 2020-08-23 17:36:59 -0500 | [diff] [blame] | 612 | fallthrough; |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 613 | case -EACCES: |
| 614 | case -EPERM: |
| 615 | case -ENOKEY: |
| 616 | case -EKEYEXPIRED: |
| 617 | case -EKEYREJECTED: |
| 618 | case -EKEYREVOKED: |
| 619 | afs_redirty_pages(wbc, mapping, first, last); |
| 620 | mapping_set_error(mapping, ret); |
| 621 | break; |
| 622 | |
| 623 | case -EDQUOT: |
| 624 | case -ENOSPC: |
| 625 | afs_redirty_pages(wbc, mapping, first, last); |
| 626 | mapping_set_error(mapping, -ENOSPC); |
| 627 | break; |
| 628 | |
| 629 | case -EROFS: |
| 630 | case -EIO: |
| 631 | case -EREMOTEIO: |
| 632 | case -EFBIG: |
| 633 | case -ENOENT: |
| 634 | case -ENOMEDIUM: |
| 635 | case -ENXIO: |
David Howells | f51375c | 2018-10-20 00:57:57 +0100 | [diff] [blame] | 636 | trace_afs_file_error(vnode, ret, afs_file_error_writeback_fail); |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 637 | afs_kill_pages(mapping, first, last); |
| 638 | mapping_set_error(mapping, ret); |
| 639 | break; |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 640 | } |
| 641 | |
| 642 | _leave(" = %d", ret); |
| 643 | return ret; |
| 644 | } |
| 645 | |
| 646 | /* |
| 647 | * write a page back to the server |
| 648 | * - the caller locked the page for us |
| 649 | */ |
| 650 | int afs_writepage(struct page *page, struct writeback_control *wbc) |
| 651 | { |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 652 | int ret; |
| 653 | |
| 654 | _enter("{%lx},", page->index); |
| 655 | |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 656 | ret = afs_write_back_from_locked_page(page->mapping, wbc, page, |
| 657 | wbc->range_end >> PAGE_SHIFT); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 658 | if (ret < 0) { |
| 659 | _leave(" = %d", ret); |
| 660 | return 0; |
| 661 | } |
| 662 | |
| 663 | wbc->nr_to_write -= ret; |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 664 | |
| 665 | _leave(" = 0"); |
| 666 | return 0; |
| 667 | } |
| 668 | |
| 669 | /* |
| 670 | * write a region of pages back to the server |
| 671 | */ |
Adrian Bunk | c1206a2 | 2007-10-16 23:26:41 -0700 | [diff] [blame] | 672 | static int afs_writepages_region(struct address_space *mapping, |
| 673 | struct writeback_control *wbc, |
| 674 | pgoff_t index, pgoff_t end, pgoff_t *_next) |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 675 | { |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 676 | struct page *page; |
| 677 | int ret, n; |
| 678 | |
| 679 | _enter(",,%lx,%lx,", index, end); |
| 680 | |
| 681 | do { |
Jan Kara | aef6e41 | 2017-11-15 17:35:23 -0800 | [diff] [blame] | 682 | n = find_get_pages_range_tag(mapping, &index, end, |
| 683 | PAGECACHE_TAG_DIRTY, 1, &page); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 684 | if (!n) |
| 685 | break; |
| 686 | |
| 687 | _debug("wback %lx", page->index); |
| 688 | |
Matthew Wilcox | b93b016 | 2018-04-10 16:36:56 -0700 | [diff] [blame] | 689 | /* |
| 690 | * at this point we hold neither the i_pages lock nor the |
| 691 | * page lock: the page may be truncated or invalidated |
| 692 | * (changing page->mapping to NULL), or even swizzled |
| 693 | * back from swapper_space to tmpfs file mapping |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 694 | */ |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 695 | ret = lock_page_killable(page); |
| 696 | if (ret < 0) { |
| 697 | put_page(page); |
| 698 | _leave(" = %d", ret); |
| 699 | return ret; |
| 700 | } |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 701 | |
David Howells | c5051c7 | 2017-03-16 16:27:49 +0000 | [diff] [blame] | 702 | if (page->mapping != mapping || !PageDirty(page)) { |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 703 | unlock_page(page); |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 704 | put_page(page); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 705 | continue; |
| 706 | } |
| 707 | |
David Howells | c5051c7 | 2017-03-16 16:27:49 +0000 | [diff] [blame] | 708 | if (PageWriteback(page)) { |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 709 | unlock_page(page); |
David Howells | c5051c7 | 2017-03-16 16:27:49 +0000 | [diff] [blame] | 710 | if (wbc->sync_mode != WB_SYNC_NONE) |
| 711 | wait_on_page_writeback(page); |
David Howells | 29c8bbb | 2017-03-16 16:27:43 +0000 | [diff] [blame] | 712 | put_page(page); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 713 | continue; |
| 714 | } |
| 715 | |
David Howells | 65a1510 | 2017-03-16 16:27:49 +0000 | [diff] [blame] | 716 | if (!clear_page_dirty_for_io(page)) |
| 717 | BUG(); |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 718 | ret = afs_write_back_from_locked_page(mapping, wbc, page, end); |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 719 | put_page(page); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 720 | if (ret < 0) { |
| 721 | _leave(" = %d", ret); |
| 722 | return ret; |
| 723 | } |
| 724 | |
| 725 | wbc->nr_to_write -= ret; |
| 726 | |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 727 | cond_resched(); |
| 728 | } while (index < end && wbc->nr_to_write > 0); |
| 729 | |
| 730 | *_next = index; |
| 731 | _leave(" = 0 [%lx]", *_next); |
| 732 | return 0; |
| 733 | } |
| 734 | |
| 735 | /* |
| 736 | * write some of the pending data back to the server |
| 737 | */ |
| 738 | int afs_writepages(struct address_space *mapping, |
| 739 | struct writeback_control *wbc) |
| 740 | { |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 741 | pgoff_t start, end, next; |
| 742 | int ret; |
| 743 | |
| 744 | _enter(""); |
| 745 | |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 746 | if (wbc->range_cyclic) { |
| 747 | start = mapping->writeback_index; |
| 748 | end = -1; |
| 749 | ret = afs_writepages_region(mapping, wbc, start, end, &next); |
Wu Fengguang | 1b430be | 2010-10-26 14:21:26 -0700 | [diff] [blame] | 750 | if (start > 0 && wbc->nr_to_write > 0 && ret == 0) |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 751 | ret = afs_writepages_region(mapping, wbc, 0, start, |
| 752 | &next); |
| 753 | mapping->writeback_index = next; |
| 754 | } else if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) { |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 755 | end = (pgoff_t)(LLONG_MAX >> PAGE_SHIFT); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 756 | ret = afs_writepages_region(mapping, wbc, 0, end, &next); |
| 757 | if (wbc->nr_to_write > 0) |
| 758 | mapping->writeback_index = next; |
| 759 | } else { |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 760 | start = wbc->range_start >> PAGE_SHIFT; |
| 761 | end = wbc->range_end >> PAGE_SHIFT; |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 762 | ret = afs_writepages_region(mapping, wbc, start, end, &next); |
| 763 | } |
| 764 | |
| 765 | _leave(" = %d", ret); |
| 766 | return ret; |
| 767 | } |
| 768 | |
| 769 | /* |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 770 | * write to an AFS file |
| 771 | */ |
Al Viro | 50b5551 | 2014-04-03 14:13:46 -0400 | [diff] [blame] | 772 | ssize_t afs_file_write(struct kiocb *iocb, struct iov_iter *from) |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 773 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 774 | struct afs_vnode *vnode = AFS_FS_I(file_inode(iocb->ki_filp)); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 775 | ssize_t result; |
Al Viro | 50b5551 | 2014-04-03 14:13:46 -0400 | [diff] [blame] | 776 | size_t count = iov_iter_count(from); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 777 | |
David Howells | 3b6492d | 2018-10-20 00:57:57 +0100 | [diff] [blame] | 778 | _enter("{%llx:%llu},{%zu},", |
Al Viro | 50b5551 | 2014-04-03 14:13:46 -0400 | [diff] [blame] | 779 | vnode->fid.vid, vnode->fid.vnode, count); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 780 | |
| 781 | if (IS_SWAPFILE(&vnode->vfs_inode)) { |
| 782 | printk(KERN_INFO |
| 783 | "AFS: Attempt to write to active swap file!\n"); |
| 784 | return -EBUSY; |
| 785 | } |
| 786 | |
| 787 | if (!count) |
| 788 | return 0; |
| 789 | |
Al Viro | 50b5551 | 2014-04-03 14:13:46 -0400 | [diff] [blame] | 790 | result = generic_file_write_iter(iocb, from); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 791 | |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 792 | _leave(" = %zd", result); |
| 793 | return result; |
| 794 | } |
| 795 | |
| 796 | /* |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 797 | * flush any dirty pages for this process, and check for write errors. |
| 798 | * - the return status from this call provides a reliable indication of |
| 799 | * whether any write errors occurred for this process. |
| 800 | */ |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 801 | int afs_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 802 | { |
Al Viro | 3c981bf | 2013-09-03 13:37:45 -0400 | [diff] [blame] | 803 | struct inode *inode = file_inode(file); |
Al Viro | 3c981bf | 2013-09-03 13:37:45 -0400 | [diff] [blame] | 804 | struct afs_vnode *vnode = AFS_FS_I(inode); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 805 | |
David Howells | 3b6492d | 2018-10-20 00:57:57 +0100 | [diff] [blame] | 806 | _enter("{%llx:%llu},{n=%pD},%d", |
Al Viro | 3c981bf | 2013-09-03 13:37:45 -0400 | [diff] [blame] | 807 | vnode->fid.vid, vnode->fid.vnode, file, |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 808 | datasync); |
| 809 | |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 810 | return file_write_and_wait_range(file, start, end); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 811 | } |
David Howells | 9b3f26c | 2009-04-03 16:42:41 +0100 | [diff] [blame] | 812 | |
| 813 | /* |
| 814 | * notification that a previously read-only page is about to become writable |
| 815 | * - if it returns an error, the caller will deliver a bus error signal |
| 816 | */ |
Souptick Joarder | 0722f18 | 2018-08-23 17:00:48 -0700 | [diff] [blame] | 817 | vm_fault_t afs_page_mkwrite(struct vm_fault *vmf) |
David Howells | 9b3f26c | 2009-04-03 16:42:41 +0100 | [diff] [blame] | 818 | { |
David Howells | 1cf7a15 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 819 | struct file *file = vmf->vma->vm_file; |
| 820 | struct inode *inode = file_inode(file); |
| 821 | struct afs_vnode *vnode = AFS_FS_I(inode); |
| 822 | unsigned long priv; |
David Howells | 9b3f26c | 2009-04-03 16:42:41 +0100 | [diff] [blame] | 823 | |
David Howells | 3b6492d | 2018-10-20 00:57:57 +0100 | [diff] [blame] | 824 | _enter("{{%llx:%llu}},{%lx}", |
David Howells | 1cf7a15 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 825 | vnode->fid.vid, vnode->fid.vnode, vmf->page->index); |
David Howells | 9b3f26c | 2009-04-03 16:42:41 +0100 | [diff] [blame] | 826 | |
David Howells | 1cf7a15 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 827 | sb_start_pagefault(inode->i_sb); |
| 828 | |
| 829 | /* Wait for the page to be written to the cache before we allow it to |
| 830 | * be modified. We then assume the entire page will need writing back. |
| 831 | */ |
David Howells | 9b3f26c | 2009-04-03 16:42:41 +0100 | [diff] [blame] | 832 | #ifdef CONFIG_AFS_FSCACHE |
David Howells | 1cf7a15 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 833 | fscache_wait_on_page_write(vnode->cache, vmf->page); |
David Howells | 9b3f26c | 2009-04-03 16:42:41 +0100 | [diff] [blame] | 834 | #endif |
| 835 | |
David Howells | 1cf7a15 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 836 | if (PageWriteback(vmf->page) && |
| 837 | wait_on_page_bit_killable(vmf->page, PG_writeback) < 0) |
| 838 | return VM_FAULT_RETRY; |
| 839 | |
| 840 | if (lock_page_killable(vmf->page) < 0) |
| 841 | return VM_FAULT_RETRY; |
| 842 | |
| 843 | /* We mustn't change page->private until writeback is complete as that |
| 844 | * details the portion of the page we need to write back and we might |
| 845 | * need to redirty the page if there's a problem. |
| 846 | */ |
| 847 | wait_on_page_writeback(vmf->page); |
| 848 | |
| 849 | priv = (unsigned long)PAGE_SIZE << AFS_PRIV_SHIFT; /* To */ |
| 850 | priv |= 0; /* From */ |
David Howells | 13524ab | 2017-11-02 15:27:53 +0000 | [diff] [blame] | 851 | trace_afs_page_dirty(vnode, tracepoint_string("mkwrite"), |
| 852 | vmf->page->index, priv); |
David Howells | 1cf7a15 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 853 | SetPagePrivate(vmf->page); |
| 854 | set_page_private(vmf->page, priv); |
David Howells | bb41348 | 2020-06-12 00:15:13 +0100 | [diff] [blame] | 855 | file_update_time(file); |
David Howells | 1cf7a15 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 856 | |
| 857 | sb_end_pagefault(inode->i_sb); |
| 858 | return VM_FAULT_LOCKED; |
David Howells | 9b3f26c | 2009-04-03 16:42:41 +0100 | [diff] [blame] | 859 | } |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 860 | |
| 861 | /* |
| 862 | * Prune the keys cached for writeback. The caller must hold vnode->wb_lock. |
| 863 | */ |
| 864 | void afs_prune_wb_keys(struct afs_vnode *vnode) |
| 865 | { |
| 866 | LIST_HEAD(graveyard); |
| 867 | struct afs_wb_key *wbk, *tmp; |
| 868 | |
| 869 | /* Discard unused keys */ |
| 870 | spin_lock(&vnode->wb_lock); |
| 871 | |
| 872 | if (!mapping_tagged(&vnode->vfs_inode.i_data, PAGECACHE_TAG_WRITEBACK) && |
| 873 | !mapping_tagged(&vnode->vfs_inode.i_data, PAGECACHE_TAG_DIRTY)) { |
| 874 | list_for_each_entry_safe(wbk, tmp, &vnode->wb_keys, vnode_link) { |
| 875 | if (refcount_read(&wbk->usage) == 1) |
| 876 | list_move(&wbk->vnode_link, &graveyard); |
| 877 | } |
| 878 | } |
| 879 | |
| 880 | spin_unlock(&vnode->wb_lock); |
| 881 | |
| 882 | while (!list_empty(&graveyard)) { |
| 883 | wbk = list_entry(graveyard.next, struct afs_wb_key, vnode_link); |
| 884 | list_del(&wbk->vnode_link); |
| 885 | afs_put_wb_key(wbk); |
| 886 | } |
| 887 | } |
| 888 | |
| 889 | /* |
| 890 | * Clean up a page during invalidation. |
| 891 | */ |
| 892 | int afs_launder_page(struct page *page) |
| 893 | { |
| 894 | struct address_space *mapping = page->mapping; |
| 895 | struct afs_vnode *vnode = AFS_FS_I(mapping->host); |
| 896 | unsigned long priv; |
| 897 | unsigned int f, t; |
| 898 | int ret = 0; |
| 899 | |
| 900 | _enter("{%lx}", page->index); |
| 901 | |
| 902 | priv = page_private(page); |
| 903 | if (clear_page_dirty_for_io(page)) { |
| 904 | f = 0; |
| 905 | t = PAGE_SIZE; |
| 906 | if (PagePrivate(page)) { |
| 907 | f = priv & AFS_PRIV_MAX; |
| 908 | t = priv >> AFS_PRIV_SHIFT; |
| 909 | } |
| 910 | |
David Howells | 13524ab | 2017-11-02 15:27:53 +0000 | [diff] [blame] | 911 | trace_afs_page_dirty(vnode, tracepoint_string("launder"), |
| 912 | page->index, priv); |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 913 | ret = afs_store_data(mapping, page->index, page->index, t, f); |
| 914 | } |
| 915 | |
David Howells | 13524ab | 2017-11-02 15:27:53 +0000 | [diff] [blame] | 916 | trace_afs_page_dirty(vnode, tracepoint_string("laundered"), |
| 917 | page->index, priv); |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 918 | set_page_private(page, 0); |
| 919 | ClearPagePrivate(page); |
| 920 | |
| 921 | #ifdef CONFIG_AFS_FSCACHE |
| 922 | if (PageFsCache(page)) { |
| 923 | fscache_wait_on_page_write(vnode->cache, page); |
| 924 | fscache_uncache_page(vnode->cache, page); |
| 925 | } |
| 926 | #endif |
| 927 | return ret; |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 928 | } |