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 ([email protected]) |
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, |
David Howells | 21db2cd | 2020-10-22 14:03:03 +0100 | [diff] [blame] | 79 | struct page **_page, 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 | |
Nick Piggin | 54566b2 | 2009-01-04 12:00:53 -0800 | [diff] [blame] | 93 | page = grab_cache_page_write_begin(mapping, index, flags); |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 94 | if (!page) |
Nick Piggin | 15b4650 | 2008-10-15 22:04:32 -0700 | [diff] [blame] | 95 | return -ENOMEM; |
Nick Piggin | 15b4650 | 2008-10-15 22:04:32 -0700 | [diff] [blame] | 96 | |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 97 | if (!PageUptodate(page) && len != PAGE_SIZE) { |
David Howells | e8e581a | 2017-03-16 16:27:44 +0000 | [diff] [blame] | 98 | ret = afs_fill_page(vnode, key, pos & PAGE_MASK, PAGE_SIZE, page); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 99 | if (ret < 0) { |
David Howells | 6d06b0d | 2017-03-16 16:27:48 +0000 | [diff] [blame] | 100 | unlock_page(page); |
| 101 | put_page(page); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 102 | _leave(" = %d [prep]", ret); |
| 103 | return ret; |
| 104 | } |
Nick Piggin | 15b4650 | 2008-10-15 22:04:32 -0700 | [diff] [blame] | 105 | SetPageUptodate(page); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 106 | } |
| 107 | |
| 108 | try_again: |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 109 | /* See if this page is already partially written in a way that we can |
| 110 | * merge the new write with. |
| 111 | */ |
| 112 | t = f = 0; |
| 113 | if (PagePrivate(page)) { |
| 114 | priv = page_private(page); |
David Howells | 185f0c7 | 2020-10-26 13:22:47 +0000 | [diff] [blame] | 115 | f = afs_page_dirty_from(priv); |
| 116 | t = afs_page_dirty_to(priv); |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 117 | ASSERTCMP(f, <=, t); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 118 | } |
| 119 | |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 120 | if (f != t) { |
David Howells | 5a039c3 | 2017-11-18 00:13:30 +0000 | [diff] [blame] | 121 | if (PageWriteback(page)) { |
| 122 | trace_afs_page_dirty(vnode, tracepoint_string("alrdy"), |
| 123 | page->index, priv); |
| 124 | goto flush_conflicting_write; |
| 125 | } |
David Howells | 5a81327 | 2018-04-06 14:17:26 +0100 | [diff] [blame] | 126 | /* If the file is being filled locally, allow inter-write |
| 127 | * spaces to be merged into writes. If it's not, only write |
| 128 | * back what the user gives us. |
| 129 | */ |
| 130 | if (!test_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags) && |
| 131 | (to < f || from > t)) |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 132 | goto flush_conflicting_write; |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 133 | } |
| 134 | |
David Howells | 21db2cd | 2020-10-22 14:03:03 +0100 | [diff] [blame] | 135 | *_page = page; |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 136 | _leave(" = 0"); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 137 | return 0; |
| 138 | |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 139 | /* The previous write and this write aren't adjacent or overlapping, so |
| 140 | * flush the page out. |
| 141 | */ |
| 142 | flush_conflicting_write: |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 143 | _debug("flush conflict"); |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 144 | ret = write_one_page(page); |
David Howells | 21db2cd | 2020-10-22 14:03:03 +0100 | [diff] [blame] | 145 | if (ret < 0) |
| 146 | goto error; |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 147 | |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 148 | ret = lock_page_killable(page); |
David Howells | 21db2cd | 2020-10-22 14:03:03 +0100 | [diff] [blame] | 149 | if (ret < 0) |
| 150 | goto error; |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 151 | goto try_again; |
David Howells | 21db2cd | 2020-10-22 14:03:03 +0100 | [diff] [blame] | 152 | |
| 153 | error: |
| 154 | put_page(page); |
| 155 | _leave(" = %d", ret); |
| 156 | return ret; |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 157 | } |
| 158 | |
| 159 | /* |
| 160 | * finalise part of a write to a page |
| 161 | */ |
Nick Piggin | 15b4650 | 2008-10-15 22:04:32 -0700 | [diff] [blame] | 162 | int afs_write_end(struct file *file, struct address_space *mapping, |
| 163 | loff_t pos, unsigned len, unsigned copied, |
| 164 | struct page *page, void *fsdata) |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 165 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 166 | struct afs_vnode *vnode = AFS_FS_I(file_inode(file)); |
David Howells | 215804a | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 167 | struct key *key = afs_file_key(file); |
David Howells | f792e3a | 2020-10-26 14:05:33 +0000 | [diff] [blame] | 168 | unsigned long priv; |
| 169 | unsigned int f, from = pos & (PAGE_SIZE - 1); |
| 170 | unsigned int t, to = from + copied; |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 171 | loff_t i_size, maybe_i_size; |
David Howells | 3ad216e | 2020-11-14 17:27:57 +0000 | [diff] [blame] | 172 | int ret = 0; |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 173 | |
David Howells | 3b6492d | 2018-10-20 00:57:57 +0100 | [diff] [blame] | 174 | _enter("{%llx:%llu},{%lx}", |
Nick Piggin | 15b4650 | 2008-10-15 22:04:32 -0700 | [diff] [blame] | 175 | vnode->fid.vid, vnode->fid.vnode, page->index); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 176 | |
David Howells | 3ad216e | 2020-11-14 17:27:57 +0000 | [diff] [blame] | 177 | if (copied == 0) |
| 178 | goto out; |
| 179 | |
Nick Piggin | 15b4650 | 2008-10-15 22:04:32 -0700 | [diff] [blame] | 180 | maybe_i_size = pos + copied; |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 181 | |
| 182 | i_size = i_size_read(&vnode->vfs_inode); |
| 183 | if (maybe_i_size > i_size) { |
David Howells | 1f32ef7 | 2020-06-12 23:58:51 +0100 | [diff] [blame] | 184 | write_seqlock(&vnode->cb_lock); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 185 | i_size = i_size_read(&vnode->vfs_inode); |
| 186 | if (maybe_i_size > i_size) |
David Howells | 22538c1 | 2021-09-08 21:55:19 +0100 | [diff] [blame] | 187 | afs_set_i_size(vnode, maybe_i_size); |
David Howells | 1f32ef7 | 2020-06-12 23:58:51 +0100 | [diff] [blame] | 188 | write_sequnlock(&vnode->cb_lock); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 189 | } |
| 190 | |
David Howells | e8e581a | 2017-03-16 16:27:44 +0000 | [diff] [blame] | 191 | if (!PageUptodate(page)) { |
| 192 | if (copied < len) { |
| 193 | /* Try and load any missing data from the server. The |
| 194 | * unmarshalling routine will take care of clearing any |
| 195 | * bits that are beyond the EOF. |
| 196 | */ |
| 197 | ret = afs_fill_page(vnode, key, pos + copied, |
| 198 | len - copied, page); |
| 199 | if (ret < 0) |
David Howells | afae457 | 2018-01-02 10:02:19 +0000 | [diff] [blame] | 200 | goto out; |
David Howells | e8e581a | 2017-03-16 16:27:44 +0000 | [diff] [blame] | 201 | } |
| 202 | SetPageUptodate(page); |
| 203 | } |
| 204 | |
David Howells | f792e3a | 2020-10-26 14:05:33 +0000 | [diff] [blame] | 205 | if (PagePrivate(page)) { |
| 206 | priv = page_private(page); |
David Howells | 185f0c7 | 2020-10-26 13:22:47 +0000 | [diff] [blame] | 207 | f = afs_page_dirty_from(priv); |
| 208 | t = afs_page_dirty_to(priv); |
David Howells | f792e3a | 2020-10-26 14:05:33 +0000 | [diff] [blame] | 209 | if (from < f) |
| 210 | f = from; |
| 211 | if (to > t) |
| 212 | t = to; |
David Howells | 185f0c7 | 2020-10-26 13:22:47 +0000 | [diff] [blame] | 213 | priv = afs_page_dirty(f, t); |
David Howells | f792e3a | 2020-10-26 14:05:33 +0000 | [diff] [blame] | 214 | set_page_private(page, priv); |
| 215 | trace_afs_page_dirty(vnode, tracepoint_string("dirty+"), |
| 216 | page->index, priv); |
| 217 | } else { |
David Howells | 185f0c7 | 2020-10-26 13:22:47 +0000 | [diff] [blame] | 218 | priv = afs_page_dirty(from, to); |
David Howells | f792e3a | 2020-10-26 14:05:33 +0000 | [diff] [blame] | 219 | attach_page_private(page, (void *)priv); |
| 220 | trace_afs_page_dirty(vnode, tracepoint_string("dirty"), |
| 221 | page->index, priv); |
| 222 | } |
| 223 | |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 224 | set_page_dirty(page); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 225 | if (PageDirty(page)) |
| 226 | _debug("dirtied"); |
David Howells | afae457 | 2018-01-02 10:02:19 +0000 | [diff] [blame] | 227 | ret = copied; |
| 228 | |
| 229 | out: |
Nick Piggin | 15b4650 | 2008-10-15 22:04:32 -0700 | [diff] [blame] | 230 | unlock_page(page); |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 231 | put_page(page); |
David Howells | afae457 | 2018-01-02 10:02:19 +0000 | [diff] [blame] | 232 | return ret; |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 233 | } |
| 234 | |
| 235 | /* |
| 236 | * kill all the pages in the given range |
| 237 | */ |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 238 | static void afs_kill_pages(struct address_space *mapping, |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 239 | pgoff_t first, pgoff_t last) |
| 240 | { |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 241 | struct afs_vnode *vnode = AFS_FS_I(mapping->host); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 242 | struct pagevec pv; |
| 243 | unsigned count, loop; |
| 244 | |
David Howells | 3b6492d | 2018-10-20 00:57:57 +0100 | [diff] [blame] | 245 | _enter("{%llx:%llu},%lx-%lx", |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 246 | vnode->fid.vid, vnode->fid.vnode, first, last); |
| 247 | |
Mel Gorman | 8667982 | 2017-11-15 17:37:52 -0800 | [diff] [blame] | 248 | pagevec_init(&pv); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 249 | |
| 250 | do { |
| 251 | _debug("kill %lx-%lx", first, last); |
| 252 | |
| 253 | count = last - first + 1; |
| 254 | if (count > PAGEVEC_SIZE) |
| 255 | count = PAGEVEC_SIZE; |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 256 | pv.nr = find_get_pages_contig(mapping, first, count, pv.pages); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 257 | ASSERTCMP(pv.nr, ==, count); |
| 258 | |
| 259 | for (loop = 0; loop < count; loop++) { |
David Howells | 7286a35 | 2017-03-16 16:27:48 +0000 | [diff] [blame] | 260 | struct page *page = pv.pages[loop]; |
| 261 | ClearPageUptodate(page); |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 262 | SetPageError(page); |
| 263 | end_page_writeback(page); |
David Howells | 7286a35 | 2017-03-16 16:27:48 +0000 | [diff] [blame] | 264 | if (page->index >= first) |
| 265 | first = page->index + 1; |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 266 | lock_page(page); |
| 267 | generic_error_remove_page(mapping, page); |
Marc Dionne | 21bd68f | 2019-04-13 08:37:37 +0100 | [diff] [blame] | 268 | unlock_page(page); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 269 | } |
| 270 | |
| 271 | __pagevec_release(&pv); |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 272 | } while (first <= last); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 273 | |
| 274 | _leave(""); |
| 275 | } |
| 276 | |
| 277 | /* |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 278 | * Redirty all the pages in a given range. |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 279 | */ |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 280 | static void afs_redirty_pages(struct writeback_control *wbc, |
| 281 | struct address_space *mapping, |
| 282 | pgoff_t first, pgoff_t last) |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 283 | { |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 284 | struct afs_vnode *vnode = AFS_FS_I(mapping->host); |
| 285 | struct pagevec pv; |
| 286 | unsigned count, loop; |
| 287 | |
David Howells | 3b6492d | 2018-10-20 00:57:57 +0100 | [diff] [blame] | 288 | _enter("{%llx:%llu},%lx-%lx", |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 289 | vnode->fid.vid, vnode->fid.vnode, first, last); |
| 290 | |
Linus Torvalds | 487e2c9 | 2017-11-16 11:41:22 -0800 | [diff] [blame] | 291 | pagevec_init(&pv); |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 292 | |
| 293 | do { |
| 294 | _debug("redirty %lx-%lx", first, last); |
| 295 | |
| 296 | count = last - first + 1; |
| 297 | if (count > PAGEVEC_SIZE) |
| 298 | count = PAGEVEC_SIZE; |
| 299 | pv.nr = find_get_pages_contig(mapping, first, count, pv.pages); |
| 300 | ASSERTCMP(pv.nr, ==, count); |
| 301 | |
| 302 | for (loop = 0; loop < count; loop++) { |
| 303 | struct page *page = pv.pages[loop]; |
| 304 | |
| 305 | redirty_page_for_writepage(wbc, page); |
| 306 | end_page_writeback(page); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 307 | if (page->index >= first) |
| 308 | first = page->index + 1; |
| 309 | } |
| 310 | |
| 311 | __pagevec_release(&pv); |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 312 | } while (first <= last); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 313 | |
| 314 | _leave(""); |
| 315 | } |
| 316 | |
| 317 | /* |
David Howells | a58823a | 2019-05-09 15:16:10 +0100 | [diff] [blame] | 318 | * completion of write to server |
| 319 | */ |
| 320 | static void afs_pages_written_back(struct afs_vnode *vnode, |
| 321 | pgoff_t first, pgoff_t last) |
| 322 | { |
| 323 | struct pagevec pv; |
| 324 | unsigned long priv; |
| 325 | unsigned count, loop; |
| 326 | |
| 327 | _enter("{%llx:%llu},{%lx-%lx}", |
| 328 | vnode->fid.vid, vnode->fid.vnode, first, last); |
| 329 | |
| 330 | pagevec_init(&pv); |
| 331 | |
| 332 | do { |
| 333 | _debug("done %lx-%lx", first, last); |
| 334 | |
| 335 | count = last - first + 1; |
| 336 | if (count > PAGEVEC_SIZE) |
| 337 | count = PAGEVEC_SIZE; |
| 338 | pv.nr = find_get_pages_contig(vnode->vfs_inode.i_mapping, |
| 339 | first, count, pv.pages); |
| 340 | ASSERTCMP(pv.nr, ==, count); |
| 341 | |
| 342 | for (loop = 0; loop < count; loop++) { |
David Howells | fa04a40 | 2020-10-21 13:22:19 +0100 | [diff] [blame] | 343 | priv = (unsigned long)detach_page_private(pv.pages[loop]); |
David Howells | a58823a | 2019-05-09 15:16:10 +0100 | [diff] [blame] | 344 | trace_afs_page_dirty(vnode, tracepoint_string("clear"), |
| 345 | pv.pages[loop]->index, priv); |
David Howells | a58823a | 2019-05-09 15:16:10 +0100 | [diff] [blame] | 346 | end_page_writeback(pv.pages[loop]); |
| 347 | } |
| 348 | first += count; |
| 349 | __pagevec_release(&pv); |
| 350 | } while (first <= last); |
| 351 | |
| 352 | afs_prune_wb_keys(vnode); |
| 353 | _leave(""); |
| 354 | } |
| 355 | |
| 356 | /* |
David Howells | e49c7b2 | 2020-04-10 20:51:51 +0100 | [diff] [blame] | 357 | * Find a key to use for the writeback. We cached the keys used to author the |
| 358 | * writes on the vnode. *_wbk will contain the last writeback key used or NULL |
| 359 | * and we need to start from there if it's set. |
| 360 | */ |
| 361 | static int afs_get_writeback_key(struct afs_vnode *vnode, |
| 362 | struct afs_wb_key **_wbk) |
| 363 | { |
| 364 | struct afs_wb_key *wbk = NULL; |
| 365 | struct list_head *p; |
| 366 | int ret = -ENOKEY, ret2; |
| 367 | |
| 368 | spin_lock(&vnode->wb_lock); |
| 369 | if (*_wbk) |
| 370 | p = (*_wbk)->vnode_link.next; |
| 371 | else |
| 372 | p = vnode->wb_keys.next; |
| 373 | |
| 374 | while (p != &vnode->wb_keys) { |
| 375 | wbk = list_entry(p, struct afs_wb_key, vnode_link); |
| 376 | _debug("wbk %u", key_serial(wbk->key)); |
| 377 | ret2 = key_validate(wbk->key); |
| 378 | if (ret2 == 0) { |
| 379 | refcount_inc(&wbk->usage); |
| 380 | _debug("USE WB KEY %u", key_serial(wbk->key)); |
| 381 | break; |
| 382 | } |
| 383 | |
| 384 | wbk = NULL; |
| 385 | if (ret == -ENOKEY) |
| 386 | ret = ret2; |
| 387 | p = p->next; |
| 388 | } |
| 389 | |
| 390 | spin_unlock(&vnode->wb_lock); |
| 391 | if (*_wbk) |
| 392 | afs_put_wb_key(*_wbk); |
| 393 | *_wbk = wbk; |
| 394 | return 0; |
| 395 | } |
| 396 | |
| 397 | static void afs_store_data_success(struct afs_operation *op) |
| 398 | { |
| 399 | struct afs_vnode *vnode = op->file[0].vnode; |
| 400 | |
David Howells | da8d075 | 2020-06-13 19:34:59 +0100 | [diff] [blame] | 401 | op->ctime = op->file[0].scb.status.mtime_client; |
David Howells | e49c7b2 | 2020-04-10 20:51:51 +0100 | [diff] [blame] | 402 | afs_vnode_commit_status(op, &op->file[0]); |
| 403 | if (op->error == 0) { |
David Howells | d383e34 | 2020-10-22 14:40:31 +0100 | [diff] [blame] | 404 | if (!op->store.laundering) |
| 405 | afs_pages_written_back(vnode, op->store.first, op->store.last); |
David Howells | e49c7b2 | 2020-04-10 20:51:51 +0100 | [diff] [blame] | 406 | afs_stat_v(vnode, n_stores); |
| 407 | atomic_long_add((op->store.last * PAGE_SIZE + op->store.last_to) - |
| 408 | (op->store.first * PAGE_SIZE + op->store.first_offset), |
| 409 | &afs_v2net(vnode)->n_store_bytes); |
| 410 | } |
| 411 | } |
| 412 | |
| 413 | static const struct afs_operation_ops afs_store_data_operation = { |
| 414 | .issue_afs_rpc = afs_fs_store_data, |
| 415 | .issue_yfs_rpc = yfs_fs_store_data, |
| 416 | .success = afs_store_data_success, |
| 417 | }; |
| 418 | |
| 419 | /* |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 420 | * write to a file |
| 421 | */ |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 422 | static int afs_store_data(struct address_space *mapping, |
| 423 | pgoff_t first, pgoff_t last, |
David Howells | d383e34 | 2020-10-22 14:40:31 +0100 | [diff] [blame] | 424 | unsigned offset, unsigned to, bool laundering) |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 425 | { |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 426 | struct afs_vnode *vnode = AFS_FS_I(mapping->host); |
David Howells | e49c7b2 | 2020-04-10 20:51:51 +0100 | [diff] [blame] | 427 | struct afs_operation *op; |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 428 | struct afs_wb_key *wbk = NULL; |
David Howells | e49c7b2 | 2020-04-10 20:51:51 +0100 | [diff] [blame] | 429 | int ret; |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 430 | |
David Howells | 3b6492d | 2018-10-20 00:57:57 +0100 | [diff] [blame] | 431 | _enter("%s{%llx:%llu.%u},%lx,%lx,%x,%x", |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 432 | vnode->volume->name, |
| 433 | vnode->fid.vid, |
| 434 | vnode->fid.vnode, |
| 435 | vnode->fid.unique, |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 436 | first, last, offset, to); |
| 437 | |
David Howells | e49c7b2 | 2020-04-10 20:51:51 +0100 | [diff] [blame] | 438 | ret = afs_get_writeback_key(vnode, &wbk); |
| 439 | if (ret) { |
| 440 | _leave(" = %d [no keys]", ret); |
| 441 | return ret; |
| 442 | } |
| 443 | |
| 444 | op = afs_alloc_operation(wbk->key, vnode->volume); |
| 445 | if (IS_ERR(op)) { |
| 446 | afs_put_wb_key(wbk); |
David Howells | a58823a | 2019-05-09 15:16:10 +0100 | [diff] [blame] | 447 | return -ENOMEM; |
David Howells | e49c7b2 | 2020-04-10 20:51:51 +0100 | [diff] [blame] | 448 | } |
David Howells | a58823a | 2019-05-09 15:16:10 +0100 | [diff] [blame] | 449 | |
David Howells | e49c7b2 | 2020-04-10 20:51:51 +0100 | [diff] [blame] | 450 | afs_op_set_vnode(op, 0, vnode); |
| 451 | op->file[0].dv_delta = 1; |
| 452 | op->store.mapping = mapping; |
David Howells | f76e082 | 2021-04-30 13:47:08 +0100 | [diff] [blame] | 453 | op->file[0].modification = true; |
David Howells | e49c7b2 | 2020-04-10 20:51:51 +0100 | [diff] [blame] | 454 | op->store.first = first; |
| 455 | op->store.last = last; |
| 456 | op->store.first_offset = offset; |
| 457 | op->store.last_to = to; |
David Howells | d383e34 | 2020-10-22 14:40:31 +0100 | [diff] [blame] | 458 | op->store.laundering = laundering; |
David Howells | b359794 | 2020-06-11 21:50:24 +0100 | [diff] [blame] | 459 | op->mtime = vnode->vfs_inode.i_mtime; |
David Howells | 811f04b | 2020-07-08 09:27:07 +0100 | [diff] [blame] | 460 | op->flags |= AFS_OPERATION_UNINTR; |
David Howells | e49c7b2 | 2020-04-10 20:51:51 +0100 | [diff] [blame] | 461 | op->ops = &afs_store_data_operation; |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 462 | |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 463 | try_next_key: |
David Howells | e49c7b2 | 2020-04-10 20:51:51 +0100 | [diff] [blame] | 464 | afs_begin_vnode_operation(op); |
| 465 | afs_wait_for_operation(op); |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 466 | |
David Howells | e49c7b2 | 2020-04-10 20:51:51 +0100 | [diff] [blame] | 467 | switch (op->error) { |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 468 | case -EACCES: |
| 469 | case -EPERM: |
| 470 | case -ENOKEY: |
| 471 | case -EKEYEXPIRED: |
| 472 | case -EKEYREJECTED: |
| 473 | case -EKEYREVOKED: |
| 474 | _debug("next"); |
David Howells | e49c7b2 | 2020-04-10 20:51:51 +0100 | [diff] [blame] | 475 | |
| 476 | ret = afs_get_writeback_key(vnode, &wbk); |
| 477 | if (ret == 0) { |
| 478 | key_put(op->key); |
| 479 | op->key = key_get(wbk->key); |
| 480 | goto try_next_key; |
| 481 | } |
| 482 | break; |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 483 | } |
| 484 | |
| 485 | afs_put_wb_key(wbk); |
David Howells | e49c7b2 | 2020-04-10 20:51:51 +0100 | [diff] [blame] | 486 | _leave(" = %d", op->error); |
| 487 | return afs_put_operation(op); |
David Howells | d2ddc77 | 2017-11-02 15:27:50 +0000 | [diff] [blame] | 488 | } |
| 489 | |
| 490 | /* |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 491 | * Synchronously write back the locked page and any subsequent non-locked dirty |
| 492 | * pages. |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 493 | */ |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 494 | static int afs_write_back_from_locked_page(struct address_space *mapping, |
| 495 | struct writeback_control *wbc, |
| 496 | struct page *primary_page, |
| 497 | pgoff_t final_page) |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 498 | { |
David Howells | 13524ab | 2017-11-02 15:27:53 +0000 | [diff] [blame] | 499 | struct afs_vnode *vnode = AFS_FS_I(mapping->host); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 500 | struct page *pages[8], *page; |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 501 | unsigned long count, priv; |
| 502 | unsigned n, offset, to, f, t; |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 503 | pgoff_t start, first, last; |
David Howells | 793fe82 | 2020-06-12 16:13:52 +0100 | [diff] [blame] | 504 | loff_t i_size, end; |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 505 | int loop, ret; |
| 506 | |
| 507 | _enter(",%lx", primary_page->index); |
| 508 | |
| 509 | count = 1; |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 510 | if (test_set_page_writeback(primary_page)) |
| 511 | BUG(); |
| 512 | |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 513 | /* Find all consecutive lockable dirty pages that have contiguous |
| 514 | * written regions, stopping when we find a page that is not |
| 515 | * immediately lockable, is not dirty or is missing, or we reach the |
| 516 | * end of the range. |
| 517 | */ |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 518 | start = primary_page->index; |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 519 | priv = page_private(primary_page); |
David Howells | 185f0c7 | 2020-10-26 13:22:47 +0000 | [diff] [blame] | 520 | offset = afs_page_dirty_from(priv); |
| 521 | to = afs_page_dirty_to(priv); |
David Howells | 13524ab | 2017-11-02 15:27:53 +0000 | [diff] [blame] | 522 | trace_afs_page_dirty(vnode, tracepoint_string("store"), |
| 523 | primary_page->index, priv); |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 524 | |
| 525 | WARN_ON(offset == to); |
David Howells | 13524ab | 2017-11-02 15:27:53 +0000 | [diff] [blame] | 526 | if (offset == to) |
| 527 | trace_afs_page_dirty(vnode, tracepoint_string("WARN"), |
| 528 | primary_page->index, priv); |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 529 | |
David Howells | 5a81327 | 2018-04-06 14:17:26 +0100 | [diff] [blame] | 530 | if (start >= final_page || |
| 531 | (to < PAGE_SIZE && !test_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags))) |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 532 | goto no_more; |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 533 | |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 534 | start++; |
| 535 | do { |
| 536 | _debug("more %lx [%lx]", start, count); |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 537 | n = final_page - start + 1; |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 538 | if (n > ARRAY_SIZE(pages)) |
| 539 | n = ARRAY_SIZE(pages); |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 540 | n = find_get_pages_contig(mapping, start, ARRAY_SIZE(pages), pages); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 541 | _debug("fgpc %u", n); |
| 542 | if (n == 0) |
| 543 | goto no_more; |
| 544 | if (pages[0]->index != start) { |
David Howells | 9d577b6 | 2007-05-10 22:22:19 -0700 | [diff] [blame] | 545 | do { |
| 546 | put_page(pages[--n]); |
| 547 | } while (n > 0); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 548 | goto no_more; |
| 549 | } |
| 550 | |
| 551 | for (loop = 0; loop < n; loop++) { |
| 552 | page = pages[loop]; |
David Howells | 5a81327 | 2018-04-06 14:17:26 +0100 | [diff] [blame] | 553 | if (to != PAGE_SIZE && |
| 554 | !test_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags)) |
| 555 | break; |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 556 | if (page->index > final_page) |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 557 | break; |
Nick Piggin | 529ae9a | 2008-08-02 12:01:03 +0200 | [diff] [blame] | 558 | if (!trylock_page(page)) |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 559 | break; |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 560 | if (!PageDirty(page) || PageWriteback(page)) { |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 561 | unlock_page(page); |
| 562 | break; |
| 563 | } |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 564 | |
| 565 | priv = page_private(page); |
David Howells | 185f0c7 | 2020-10-26 13:22:47 +0000 | [diff] [blame] | 566 | f = afs_page_dirty_from(priv); |
| 567 | t = afs_page_dirty_to(priv); |
David Howells | 5a81327 | 2018-04-06 14:17:26 +0100 | [diff] [blame] | 568 | if (f != 0 && |
| 569 | !test_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags)) { |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 570 | unlock_page(page); |
| 571 | break; |
| 572 | } |
| 573 | to = t; |
| 574 | |
David Howells | 13524ab | 2017-11-02 15:27:53 +0000 | [diff] [blame] | 575 | trace_afs_page_dirty(vnode, tracepoint_string("store+"), |
| 576 | page->index, priv); |
| 577 | |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 578 | if (!clear_page_dirty_for_io(page)) |
| 579 | BUG(); |
| 580 | if (test_set_page_writeback(page)) |
| 581 | BUG(); |
| 582 | unlock_page(page); |
| 583 | put_page(page); |
| 584 | } |
| 585 | count += loop; |
| 586 | if (loop < n) { |
| 587 | for (; loop < n; loop++) |
| 588 | put_page(pages[loop]); |
| 589 | goto no_more; |
| 590 | } |
| 591 | |
| 592 | start += loop; |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 593 | } while (start <= final_page && count < 65536); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 594 | |
| 595 | no_more: |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 596 | /* We now have a contiguous set of dirty pages, each with writeback |
| 597 | * set; the first page is still locked at this point, but all the rest |
| 598 | * have been unlocked. |
| 599 | */ |
| 600 | unlock_page(primary_page); |
| 601 | |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 602 | first = primary_page->index; |
| 603 | last = first + count - 1; |
| 604 | |
David Howells | 793fe82 | 2020-06-12 16:13:52 +0100 | [diff] [blame] | 605 | end = (loff_t)last * PAGE_SIZE + to; |
| 606 | i_size = i_size_read(&vnode->vfs_inode); |
| 607 | |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 608 | _debug("write back %lx[%u..] to %lx[..%u]", first, offset, last, to); |
David Howells | 793fe82 | 2020-06-12 16:13:52 +0100 | [diff] [blame] | 609 | if (end > i_size) |
| 610 | to = i_size & ~PAGE_MASK; |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 611 | |
David Howells | d383e34 | 2020-10-22 14:40:31 +0100 | [diff] [blame] | 612 | ret = afs_store_data(mapping, first, last, offset, to, false); |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 613 | switch (ret) { |
| 614 | case 0: |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 615 | ret = count; |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 616 | break; |
| 617 | |
| 618 | default: |
| 619 | 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] | 620 | fallthrough; |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 621 | case -EACCES: |
| 622 | case -EPERM: |
| 623 | case -ENOKEY: |
| 624 | case -EKEYEXPIRED: |
| 625 | case -EKEYREJECTED: |
| 626 | case -EKEYREVOKED: |
| 627 | afs_redirty_pages(wbc, mapping, first, last); |
| 628 | mapping_set_error(mapping, ret); |
| 629 | break; |
| 630 | |
| 631 | case -EDQUOT: |
| 632 | case -ENOSPC: |
| 633 | afs_redirty_pages(wbc, mapping, first, last); |
| 634 | mapping_set_error(mapping, -ENOSPC); |
| 635 | break; |
| 636 | |
| 637 | case -EROFS: |
| 638 | case -EIO: |
| 639 | case -EREMOTEIO: |
| 640 | case -EFBIG: |
| 641 | case -ENOENT: |
| 642 | case -ENOMEDIUM: |
| 643 | case -ENXIO: |
David Howells | f51375c | 2018-10-20 00:57:57 +0100 | [diff] [blame] | 644 | trace_afs_file_error(vnode, ret, afs_file_error_writeback_fail); |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 645 | afs_kill_pages(mapping, first, last); |
| 646 | mapping_set_error(mapping, ret); |
| 647 | break; |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 648 | } |
| 649 | |
| 650 | _leave(" = %d", ret); |
| 651 | return ret; |
| 652 | } |
| 653 | |
| 654 | /* |
| 655 | * write a page back to the server |
| 656 | * - the caller locked the page for us |
| 657 | */ |
| 658 | int afs_writepage(struct page *page, struct writeback_control *wbc) |
| 659 | { |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 660 | int ret; |
| 661 | |
| 662 | _enter("{%lx},", page->index); |
| 663 | |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 664 | ret = afs_write_back_from_locked_page(page->mapping, wbc, page, |
| 665 | wbc->range_end >> PAGE_SHIFT); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 666 | if (ret < 0) { |
| 667 | _leave(" = %d", ret); |
| 668 | return 0; |
| 669 | } |
| 670 | |
| 671 | wbc->nr_to_write -= ret; |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 672 | |
| 673 | _leave(" = 0"); |
| 674 | return 0; |
| 675 | } |
| 676 | |
| 677 | /* |
| 678 | * write a region of pages back to the server |
| 679 | */ |
Adrian Bunk | c1206a2 | 2007-10-16 23:26:41 -0700 | [diff] [blame] | 680 | static int afs_writepages_region(struct address_space *mapping, |
| 681 | struct writeback_control *wbc, |
| 682 | pgoff_t index, pgoff_t end, pgoff_t *_next) |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 683 | { |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 684 | struct page *page; |
| 685 | int ret, n; |
| 686 | |
| 687 | _enter(",,%lx,%lx,", index, end); |
| 688 | |
| 689 | do { |
Jan Kara | aef6e41 | 2017-11-15 17:35:23 -0800 | [diff] [blame] | 690 | n = find_get_pages_range_tag(mapping, &index, end, |
| 691 | PAGECACHE_TAG_DIRTY, 1, &page); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 692 | if (!n) |
| 693 | break; |
| 694 | |
| 695 | _debug("wback %lx", page->index); |
| 696 | |
Matthew Wilcox | b93b016 | 2018-04-10 16:36:56 -0700 | [diff] [blame] | 697 | /* |
| 698 | * at this point we hold neither the i_pages lock nor the |
| 699 | * page lock: the page may be truncated or invalidated |
| 700 | * (changing page->mapping to NULL), or even swizzled |
| 701 | * back from swapper_space to tmpfs file mapping |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 702 | */ |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 703 | ret = lock_page_killable(page); |
| 704 | if (ret < 0) { |
| 705 | put_page(page); |
| 706 | _leave(" = %d", ret); |
| 707 | return ret; |
| 708 | } |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 709 | |
David Howells | c5051c7 | 2017-03-16 16:27:49 +0000 | [diff] [blame] | 710 | if (page->mapping != mapping || !PageDirty(page)) { |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 711 | unlock_page(page); |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 712 | put_page(page); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 713 | continue; |
| 714 | } |
| 715 | |
David Howells | c5051c7 | 2017-03-16 16:27:49 +0000 | [diff] [blame] | 716 | if (PageWriteback(page)) { |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 717 | unlock_page(page); |
David Howells | c5051c7 | 2017-03-16 16:27:49 +0000 | [diff] [blame] | 718 | if (wbc->sync_mode != WB_SYNC_NONE) |
| 719 | wait_on_page_writeback(page); |
David Howells | 29c8bbb | 2017-03-16 16:27:43 +0000 | [diff] [blame] | 720 | put_page(page); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 721 | continue; |
| 722 | } |
| 723 | |
David Howells | 65a1510 | 2017-03-16 16:27:49 +0000 | [diff] [blame] | 724 | if (!clear_page_dirty_for_io(page)) |
| 725 | BUG(); |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 726 | ret = afs_write_back_from_locked_page(mapping, wbc, page, end); |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 727 | put_page(page); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 728 | if (ret < 0) { |
| 729 | _leave(" = %d", ret); |
| 730 | return ret; |
| 731 | } |
| 732 | |
| 733 | wbc->nr_to_write -= ret; |
| 734 | |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 735 | cond_resched(); |
| 736 | } while (index < end && wbc->nr_to_write > 0); |
| 737 | |
| 738 | *_next = index; |
| 739 | _leave(" = 0 [%lx]", *_next); |
| 740 | return 0; |
| 741 | } |
| 742 | |
| 743 | /* |
| 744 | * write some of the pending data back to the server |
| 745 | */ |
| 746 | int afs_writepages(struct address_space *mapping, |
| 747 | struct writeback_control *wbc) |
| 748 | { |
David Howells | ec0fa0b | 2020-10-07 14:22:12 +0100 | [diff] [blame] | 749 | struct afs_vnode *vnode = AFS_FS_I(mapping->host); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 750 | pgoff_t start, end, next; |
| 751 | int ret; |
| 752 | |
| 753 | _enter(""); |
| 754 | |
David Howells | ec0fa0b | 2020-10-07 14:22:12 +0100 | [diff] [blame] | 755 | /* We have to be careful as we can end up racing with setattr() |
| 756 | * truncating the pagecache since the caller doesn't take a lock here |
| 757 | * to prevent it. |
| 758 | */ |
| 759 | if (wbc->sync_mode == WB_SYNC_ALL) |
| 760 | down_read(&vnode->validate_lock); |
| 761 | else if (!down_read_trylock(&vnode->validate_lock)) |
| 762 | return 0; |
| 763 | |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 764 | if (wbc->range_cyclic) { |
| 765 | start = mapping->writeback_index; |
| 766 | end = -1; |
| 767 | ret = afs_writepages_region(mapping, wbc, start, end, &next); |
Wu Fengguang | 1b430be | 2010-10-26 14:21:26 -0700 | [diff] [blame] | 768 | if (start > 0 && wbc->nr_to_write > 0 && ret == 0) |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 769 | ret = afs_writepages_region(mapping, wbc, 0, start, |
| 770 | &next); |
| 771 | mapping->writeback_index = next; |
| 772 | } else if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) { |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 773 | end = (pgoff_t)(LLONG_MAX >> PAGE_SHIFT); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 774 | ret = afs_writepages_region(mapping, wbc, 0, end, &next); |
| 775 | if (wbc->nr_to_write > 0) |
| 776 | mapping->writeback_index = next; |
| 777 | } else { |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 778 | start = wbc->range_start >> PAGE_SHIFT; |
| 779 | end = wbc->range_end >> PAGE_SHIFT; |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 780 | ret = afs_writepages_region(mapping, wbc, start, end, &next); |
| 781 | } |
| 782 | |
David Howells | ec0fa0b | 2020-10-07 14:22:12 +0100 | [diff] [blame] | 783 | up_read(&vnode->validate_lock); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 784 | _leave(" = %d", ret); |
| 785 | return ret; |
| 786 | } |
| 787 | |
| 788 | /* |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 789 | * write to an AFS file |
| 790 | */ |
Al Viro | 50b5551 | 2014-04-03 14:13:46 -0400 | [diff] [blame] | 791 | ssize_t afs_file_write(struct kiocb *iocb, struct iov_iter *from) |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 792 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 793 | struct afs_vnode *vnode = AFS_FS_I(file_inode(iocb->ki_filp)); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 794 | ssize_t result; |
Al Viro | 50b5551 | 2014-04-03 14:13:46 -0400 | [diff] [blame] | 795 | size_t count = iov_iter_count(from); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 796 | |
David Howells | 3b6492d | 2018-10-20 00:57:57 +0100 | [diff] [blame] | 797 | _enter("{%llx:%llu},{%zu},", |
Al Viro | 50b5551 | 2014-04-03 14:13:46 -0400 | [diff] [blame] | 798 | vnode->fid.vid, vnode->fid.vnode, count); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 799 | |
| 800 | if (IS_SWAPFILE(&vnode->vfs_inode)) { |
| 801 | printk(KERN_INFO |
| 802 | "AFS: Attempt to write to active swap file!\n"); |
| 803 | return -EBUSY; |
| 804 | } |
| 805 | |
| 806 | if (!count) |
| 807 | return 0; |
| 808 | |
Al Viro | 50b5551 | 2014-04-03 14:13:46 -0400 | [diff] [blame] | 809 | result = generic_file_write_iter(iocb, from); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 810 | |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 811 | _leave(" = %zd", result); |
| 812 | return result; |
| 813 | } |
| 814 | |
| 815 | /* |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 816 | * flush any dirty pages for this process, and check for write errors. |
| 817 | * - the return status from this call provides a reliable indication of |
| 818 | * whether any write errors occurred for this process. |
| 819 | */ |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 820 | 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] | 821 | { |
Al Viro | 3c981bf | 2013-09-03 13:37:45 -0400 | [diff] [blame] | 822 | struct inode *inode = file_inode(file); |
Al Viro | 3c981bf | 2013-09-03 13:37:45 -0400 | [diff] [blame] | 823 | struct afs_vnode *vnode = AFS_FS_I(inode); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 824 | |
David Howells | 3b6492d | 2018-10-20 00:57:57 +0100 | [diff] [blame] | 825 | _enter("{%llx:%llu},{n=%pD},%d", |
Al Viro | 3c981bf | 2013-09-03 13:37:45 -0400 | [diff] [blame] | 826 | vnode->fid.vid, vnode->fid.vnode, file, |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 827 | datasync); |
| 828 | |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 829 | return file_write_and_wait_range(file, start, end); |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 830 | } |
David Howells | 9b3f26c | 2009-04-03 16:42:41 +0100 | [diff] [blame] | 831 | |
| 832 | /* |
| 833 | * notification that a previously read-only page is about to become writable |
| 834 | * - if it returns an error, the caller will deliver a bus error signal |
| 835 | */ |
Souptick Joarder | 0722f18 | 2018-08-23 17:00:48 -0700 | [diff] [blame] | 836 | vm_fault_t afs_page_mkwrite(struct vm_fault *vmf) |
David Howells | 9b3f26c | 2009-04-03 16:42:41 +0100 | [diff] [blame] | 837 | { |
David Howells | 1cf7a15 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 838 | struct file *file = vmf->vma->vm_file; |
| 839 | struct inode *inode = file_inode(file); |
| 840 | struct afs_vnode *vnode = AFS_FS_I(inode); |
| 841 | unsigned long priv; |
David Howells | 9b3f26c | 2009-04-03 16:42:41 +0100 | [diff] [blame] | 842 | |
David Howells | 3b6492d | 2018-10-20 00:57:57 +0100 | [diff] [blame] | 843 | _enter("{{%llx:%llu}},{%lx}", |
David Howells | 1cf7a15 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 844 | vnode->fid.vid, vnode->fid.vnode, vmf->page->index); |
David Howells | 9b3f26c | 2009-04-03 16:42:41 +0100 | [diff] [blame] | 845 | |
David Howells | 1cf7a15 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 846 | sb_start_pagefault(inode->i_sb); |
| 847 | |
| 848 | /* Wait for the page to be written to the cache before we allow it to |
| 849 | * be modified. We then assume the entire page will need writing back. |
| 850 | */ |
David Howells | 9b3f26c | 2009-04-03 16:42:41 +0100 | [diff] [blame] | 851 | #ifdef CONFIG_AFS_FSCACHE |
David Howells | 1cf7a15 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 852 | fscache_wait_on_page_write(vnode->cache, vmf->page); |
David Howells | 9b3f26c | 2009-04-03 16:42:41 +0100 | [diff] [blame] | 853 | #endif |
| 854 | |
David Howells | 1cf7a15 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 855 | if (PageWriteback(vmf->page) && |
| 856 | wait_on_page_bit_killable(vmf->page, PG_writeback) < 0) |
| 857 | return VM_FAULT_RETRY; |
| 858 | |
| 859 | if (lock_page_killable(vmf->page) < 0) |
| 860 | return VM_FAULT_RETRY; |
| 861 | |
| 862 | /* We mustn't change page->private until writeback is complete as that |
| 863 | * details the portion of the page we need to write back and we might |
| 864 | * need to redirty the page if there's a problem. |
| 865 | */ |
| 866 | wait_on_page_writeback(vmf->page); |
| 867 | |
David Howells | 185f0c7 | 2020-10-26 13:22:47 +0000 | [diff] [blame] | 868 | priv = afs_page_dirty(0, PAGE_SIZE); |
David Howells | f86726a | 2020-10-22 14:08:23 +0100 | [diff] [blame] | 869 | priv = afs_page_dirty_mmapped(priv); |
David Howells | 13524ab | 2017-11-02 15:27:53 +0000 | [diff] [blame] | 870 | trace_afs_page_dirty(vnode, tracepoint_string("mkwrite"), |
| 871 | vmf->page->index, priv); |
David Howells | fa04a40 | 2020-10-21 13:22:19 +0100 | [diff] [blame] | 872 | if (PagePrivate(vmf->page)) |
| 873 | set_page_private(vmf->page, priv); |
| 874 | else |
| 875 | attach_page_private(vmf->page, (void *)priv); |
David Howells | bb41348 | 2020-06-12 00:15:13 +0100 | [diff] [blame] | 876 | file_update_time(file); |
David Howells | 1cf7a15 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 877 | |
| 878 | sb_end_pagefault(inode->i_sb); |
| 879 | return VM_FAULT_LOCKED; |
David Howells | 9b3f26c | 2009-04-03 16:42:41 +0100 | [diff] [blame] | 880 | } |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 881 | |
| 882 | /* |
| 883 | * Prune the keys cached for writeback. The caller must hold vnode->wb_lock. |
| 884 | */ |
| 885 | void afs_prune_wb_keys(struct afs_vnode *vnode) |
| 886 | { |
| 887 | LIST_HEAD(graveyard); |
| 888 | struct afs_wb_key *wbk, *tmp; |
| 889 | |
| 890 | /* Discard unused keys */ |
| 891 | spin_lock(&vnode->wb_lock); |
| 892 | |
| 893 | if (!mapping_tagged(&vnode->vfs_inode.i_data, PAGECACHE_TAG_WRITEBACK) && |
| 894 | !mapping_tagged(&vnode->vfs_inode.i_data, PAGECACHE_TAG_DIRTY)) { |
| 895 | list_for_each_entry_safe(wbk, tmp, &vnode->wb_keys, vnode_link) { |
| 896 | if (refcount_read(&wbk->usage) == 1) |
| 897 | list_move(&wbk->vnode_link, &graveyard); |
| 898 | } |
| 899 | } |
| 900 | |
| 901 | spin_unlock(&vnode->wb_lock); |
| 902 | |
| 903 | while (!list_empty(&graveyard)) { |
| 904 | wbk = list_entry(graveyard.next, struct afs_wb_key, vnode_link); |
| 905 | list_del(&wbk->vnode_link); |
| 906 | afs_put_wb_key(wbk); |
| 907 | } |
| 908 | } |
| 909 | |
| 910 | /* |
| 911 | * Clean up a page during invalidation. |
| 912 | */ |
| 913 | int afs_launder_page(struct page *page) |
| 914 | { |
| 915 | struct address_space *mapping = page->mapping; |
| 916 | struct afs_vnode *vnode = AFS_FS_I(mapping->host); |
| 917 | unsigned long priv; |
| 918 | unsigned int f, t; |
| 919 | int ret = 0; |
| 920 | |
| 921 | _enter("{%lx}", page->index); |
| 922 | |
| 923 | priv = page_private(page); |
| 924 | if (clear_page_dirty_for_io(page)) { |
| 925 | f = 0; |
| 926 | t = PAGE_SIZE; |
| 927 | if (PagePrivate(page)) { |
David Howells | 185f0c7 | 2020-10-26 13:22:47 +0000 | [diff] [blame] | 928 | f = afs_page_dirty_from(priv); |
| 929 | t = afs_page_dirty_to(priv); |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 930 | } |
| 931 | |
David Howells | 13524ab | 2017-11-02 15:27:53 +0000 | [diff] [blame] | 932 | trace_afs_page_dirty(vnode, tracepoint_string("launder"), |
| 933 | page->index, priv); |
David Howells | d383e34 | 2020-10-22 14:40:31 +0100 | [diff] [blame] | 934 | ret = afs_store_data(mapping, page->index, page->index, t, f, true); |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 935 | } |
| 936 | |
David Howells | fa04a40 | 2020-10-21 13:22:19 +0100 | [diff] [blame] | 937 | priv = (unsigned long)detach_page_private(page); |
David Howells | 13524ab | 2017-11-02 15:27:53 +0000 | [diff] [blame] | 938 | trace_afs_page_dirty(vnode, tracepoint_string("laundered"), |
| 939 | page->index, priv); |
David Howells | 4343d00 | 2017-11-02 15:27:52 +0000 | [diff] [blame] | 940 | |
| 941 | #ifdef CONFIG_AFS_FSCACHE |
| 942 | if (PageFsCache(page)) { |
| 943 | fscache_wait_on_page_write(vnode->cache, page); |
| 944 | fscache_uncache_page(vnode->cache, page); |
| 945 | } |
| 946 | #endif |
| 947 | return ret; |
David Howells | 31143d5 | 2007-05-09 02:33:46 -0700 | [diff] [blame] | 948 | } |