Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 1 | /* |
| 2 | * V9FS cache definitions. |
| 3 | * |
| 4 | * Copyright (C) 2009 by Abhishek Kulkarni <adkulkar@umail.iu.edu> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2 |
| 8 | * as published by the Free Software Foundation. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to: |
| 17 | * Free Software Foundation |
| 18 | * 51 Franklin Street, Fifth Floor |
| 19 | * Boston, MA 02111-1301 USA |
| 20 | * |
| 21 | */ |
| 22 | |
| 23 | #include <linux/jiffies.h> |
| 24 | #include <linux/file.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 25 | #include <linux/slab.h> |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 26 | #include <linux/stat.h> |
| 27 | #include <linux/sched.h> |
| 28 | #include <linux/fs.h> |
| 29 | #include <net/9p/9p.h> |
| 30 | |
| 31 | #include "v9fs.h" |
| 32 | #include "cache.h" |
| 33 | |
| 34 | #define CACHETAG_LEN 11 |
| 35 | |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 36 | struct fscache_netfs v9fs_cache_netfs = { |
| 37 | .name = "9p", |
| 38 | .version = 0, |
| 39 | }; |
| 40 | |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 41 | /** |
| 42 | * v9fs_random_cachetag - Generate a random tag to be associated |
| 43 | * with a new cache session. |
| 44 | * |
| 45 | * The value of jiffies is used for a fairly randomly cache tag. |
| 46 | */ |
| 47 | |
| 48 | static |
| 49 | int v9fs_random_cachetag(struct v9fs_session_info *v9ses) |
| 50 | { |
| 51 | v9ses->cachetag = kmalloc(CACHETAG_LEN, GFP_KERNEL); |
| 52 | if (!v9ses->cachetag) |
| 53 | return -ENOMEM; |
| 54 | |
| 55 | return scnprintf(v9ses->cachetag, CACHETAG_LEN, "%lu", jiffies); |
| 56 | } |
| 57 | |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 58 | const struct fscache_cookie_def v9fs_cache_session_index_def = { |
Aneesh Kumar K.V | a78ce05 | 2011-02-28 17:04:02 +0530 | [diff] [blame] | 59 | .name = "9P.session", |
| 60 | .type = FSCACHE_COOKIE_TYPE_INDEX, |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 61 | }; |
| 62 | |
| 63 | void v9fs_cache_session_get_cookie(struct v9fs_session_info *v9ses) |
| 64 | { |
| 65 | /* If no cache session tag was specified, we generate a random one. */ |
David Howells | 402cb8d | 2018-04-04 13:41:28 +0100 | [diff] [blame] | 66 | if (!v9ses->cachetag) { |
| 67 | if (v9fs_random_cachetag(v9ses) < 0) { |
| 68 | v9ses->fscache = NULL; |
| 69 | return; |
| 70 | } |
| 71 | } |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 72 | |
| 73 | v9ses->fscache = fscache_acquire_cookie(v9fs_cache_netfs.primary_index, |
| 74 | &v9fs_cache_session_index_def, |
David Howells | 402cb8d | 2018-04-04 13:41:28 +0100 | [diff] [blame] | 75 | v9ses->cachetag, |
| 76 | strlen(v9ses->cachetag), |
| 77 | NULL, 0, |
David Howells | ee1235a | 2018-04-04 13:41:28 +0100 | [diff] [blame] | 78 | v9ses, 0, true); |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 79 | p9_debug(P9_DEBUG_FSC, "session %p get cookie %p\n", |
| 80 | v9ses, v9ses->fscache); |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 81 | } |
| 82 | |
| 83 | void v9fs_cache_session_put_cookie(struct v9fs_session_info *v9ses) |
| 84 | { |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 85 | p9_debug(P9_DEBUG_FSC, "session %p put cookie %p\n", |
| 86 | v9ses, v9ses->fscache); |
David Howells | 402cb8d | 2018-04-04 13:41:28 +0100 | [diff] [blame] | 87 | fscache_relinquish_cookie(v9ses->fscache, NULL, false); |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 88 | v9ses->fscache = NULL; |
| 89 | } |
| 90 | |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 91 | static enum |
| 92 | fscache_checkaux v9fs_cache_inode_check_aux(void *cookie_netfs_data, |
| 93 | const void *buffer, |
David Howells | ee1235a | 2018-04-04 13:41:28 +0100 | [diff] [blame] | 94 | uint16_t buflen, |
| 95 | loff_t object_size) |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 96 | { |
Aneesh Kumar K.V | a78ce05 | 2011-02-28 17:04:02 +0530 | [diff] [blame] | 97 | const struct v9fs_inode *v9inode = cookie_netfs_data; |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 98 | |
Aneesh Kumar K.V | fd2421f | 2011-07-11 16:40:59 +0000 | [diff] [blame] | 99 | if (buflen != sizeof(v9inode->qid.version)) |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 100 | return FSCACHE_CHECKAUX_OBSOLETE; |
| 101 | |
Aneesh Kumar K.V | fd2421f | 2011-07-11 16:40:59 +0000 | [diff] [blame] | 102 | if (memcmp(buffer, &v9inode->qid.version, |
| 103 | sizeof(v9inode->qid.version))) |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 104 | return FSCACHE_CHECKAUX_OBSOLETE; |
| 105 | |
| 106 | return FSCACHE_CHECKAUX_OKAY; |
| 107 | } |
| 108 | |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 109 | const struct fscache_cookie_def v9fs_cache_inode_index_def = { |
| 110 | .name = "9p.inode", |
| 111 | .type = FSCACHE_COOKIE_TYPE_DATAFILE, |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 112 | .check_aux = v9fs_cache_inode_check_aux, |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 113 | }; |
| 114 | |
| 115 | void v9fs_cache_inode_get_cookie(struct inode *inode) |
| 116 | { |
Aneesh Kumar K.V | a78ce05 | 2011-02-28 17:04:02 +0530 | [diff] [blame] | 117 | struct v9fs_inode *v9inode; |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 118 | struct v9fs_session_info *v9ses; |
| 119 | |
| 120 | if (!S_ISREG(inode->i_mode)) |
| 121 | return; |
| 122 | |
Aneesh Kumar K.V | a78ce05 | 2011-02-28 17:04:02 +0530 | [diff] [blame] | 123 | v9inode = V9FS_I(inode); |
| 124 | if (v9inode->fscache) |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 125 | return; |
| 126 | |
| 127 | v9ses = v9fs_inode2v9ses(inode); |
Aneesh Kumar K.V | a78ce05 | 2011-02-28 17:04:02 +0530 | [diff] [blame] | 128 | v9inode->fscache = fscache_acquire_cookie(v9ses->fscache, |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 129 | &v9fs_cache_inode_index_def, |
David Howells | 402cb8d | 2018-04-04 13:41:28 +0100 | [diff] [blame] | 130 | &v9inode->qid.path, |
| 131 | sizeof(v9inode->qid.path), |
| 132 | &v9inode->qid.version, |
| 133 | sizeof(v9inode->qid.version), |
David Howells | ee1235a | 2018-04-04 13:41:28 +0100 | [diff] [blame] | 134 | v9inode, |
| 135 | i_size_read(&v9inode->vfs_inode), |
| 136 | true); |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 137 | |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 138 | p9_debug(P9_DEBUG_FSC, "inode %p get cookie %p\n", |
| 139 | inode, v9inode->fscache); |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 140 | } |
| 141 | |
| 142 | void v9fs_cache_inode_put_cookie(struct inode *inode) |
| 143 | { |
Aneesh Kumar K.V | a78ce05 | 2011-02-28 17:04:02 +0530 | [diff] [blame] | 144 | struct v9fs_inode *v9inode = V9FS_I(inode); |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 145 | |
Aneesh Kumar K.V | a78ce05 | 2011-02-28 17:04:02 +0530 | [diff] [blame] | 146 | if (!v9inode->fscache) |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 147 | return; |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 148 | p9_debug(P9_DEBUG_FSC, "inode %p put cookie %p\n", |
| 149 | inode, v9inode->fscache); |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 150 | |
David Howells | 402cb8d | 2018-04-04 13:41:28 +0100 | [diff] [blame] | 151 | fscache_relinquish_cookie(v9inode->fscache, &v9inode->qid.version, |
| 152 | false); |
Aneesh Kumar K.V | a78ce05 | 2011-02-28 17:04:02 +0530 | [diff] [blame] | 153 | v9inode->fscache = NULL; |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 154 | } |
| 155 | |
| 156 | void v9fs_cache_inode_flush_cookie(struct inode *inode) |
| 157 | { |
Aneesh Kumar K.V | a78ce05 | 2011-02-28 17:04:02 +0530 | [diff] [blame] | 158 | struct v9fs_inode *v9inode = V9FS_I(inode); |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 159 | |
Aneesh Kumar K.V | a78ce05 | 2011-02-28 17:04:02 +0530 | [diff] [blame] | 160 | if (!v9inode->fscache) |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 161 | return; |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 162 | p9_debug(P9_DEBUG_FSC, "inode %p flush cookie %p\n", |
| 163 | inode, v9inode->fscache); |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 164 | |
David Howells | 402cb8d | 2018-04-04 13:41:28 +0100 | [diff] [blame] | 165 | fscache_relinquish_cookie(v9inode->fscache, NULL, true); |
Aneesh Kumar K.V | a78ce05 | 2011-02-28 17:04:02 +0530 | [diff] [blame] | 166 | v9inode->fscache = NULL; |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 167 | } |
| 168 | |
| 169 | void v9fs_cache_inode_set_cookie(struct inode *inode, struct file *filp) |
| 170 | { |
Aneesh Kumar K.V | a78ce05 | 2011-02-28 17:04:02 +0530 | [diff] [blame] | 171 | struct v9fs_inode *v9inode = V9FS_I(inode); |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 172 | |
Aneesh Kumar K.V | a78ce05 | 2011-02-28 17:04:02 +0530 | [diff] [blame] | 173 | if (!v9inode->fscache) |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 174 | return; |
| 175 | |
Sasha Levin | 8f5fed1 | 2016-01-07 17:49:51 -0500 | [diff] [blame] | 176 | mutex_lock(&v9inode->fscache_lock); |
Geyslan G. Bem | bd126e5 | 2013-09-28 20:32:13 -0300 | [diff] [blame] | 177 | |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 178 | if ((filp->f_flags & O_ACCMODE) != O_RDONLY) |
| 179 | v9fs_cache_inode_flush_cookie(inode); |
| 180 | else |
| 181 | v9fs_cache_inode_get_cookie(inode); |
| 182 | |
Sasha Levin | 8f5fed1 | 2016-01-07 17:49:51 -0500 | [diff] [blame] | 183 | mutex_unlock(&v9inode->fscache_lock); |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 184 | } |
| 185 | |
| 186 | void v9fs_cache_inode_reset_cookie(struct inode *inode) |
| 187 | { |
Aneesh Kumar K.V | a78ce05 | 2011-02-28 17:04:02 +0530 | [diff] [blame] | 188 | struct v9fs_inode *v9inode = V9FS_I(inode); |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 189 | struct v9fs_session_info *v9ses; |
| 190 | struct fscache_cookie *old; |
| 191 | |
Aneesh Kumar K.V | a78ce05 | 2011-02-28 17:04:02 +0530 | [diff] [blame] | 192 | if (!v9inode->fscache) |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 193 | return; |
| 194 | |
Aneesh Kumar K.V | a78ce05 | 2011-02-28 17:04:02 +0530 | [diff] [blame] | 195 | old = v9inode->fscache; |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 196 | |
Sasha Levin | 8f5fed1 | 2016-01-07 17:49:51 -0500 | [diff] [blame] | 197 | mutex_lock(&v9inode->fscache_lock); |
David Howells | 402cb8d | 2018-04-04 13:41:28 +0100 | [diff] [blame] | 198 | fscache_relinquish_cookie(v9inode->fscache, NULL, true); |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 199 | |
| 200 | v9ses = v9fs_inode2v9ses(inode); |
Aneesh Kumar K.V | a78ce05 | 2011-02-28 17:04:02 +0530 | [diff] [blame] | 201 | v9inode->fscache = fscache_acquire_cookie(v9ses->fscache, |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 202 | &v9fs_cache_inode_index_def, |
David Howells | 402cb8d | 2018-04-04 13:41:28 +0100 | [diff] [blame] | 203 | &v9inode->qid.path, |
| 204 | sizeof(v9inode->qid.path), |
| 205 | &v9inode->qid.version, |
| 206 | sizeof(v9inode->qid.version), |
David Howells | ee1235a | 2018-04-04 13:41:28 +0100 | [diff] [blame] | 207 | v9inode, |
| 208 | i_size_read(&v9inode->vfs_inode), |
| 209 | true); |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 210 | p9_debug(P9_DEBUG_FSC, "inode %p revalidating cookie old %p new %p\n", |
| 211 | inode, old, v9inode->fscache); |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 212 | |
Sasha Levin | 8f5fed1 | 2016-01-07 17:49:51 -0500 | [diff] [blame] | 213 | mutex_unlock(&v9inode->fscache_lock); |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 214 | } |
| 215 | |
| 216 | int __v9fs_fscache_release_page(struct page *page, gfp_t gfp) |
| 217 | { |
| 218 | struct inode *inode = page->mapping->host; |
Aneesh Kumar K.V | a78ce05 | 2011-02-28 17:04:02 +0530 | [diff] [blame] | 219 | struct v9fs_inode *v9inode = V9FS_I(inode); |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 220 | |
Aneesh Kumar K.V | a78ce05 | 2011-02-28 17:04:02 +0530 | [diff] [blame] | 221 | BUG_ON(!v9inode->fscache); |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 222 | |
Aneesh Kumar K.V | a78ce05 | 2011-02-28 17:04:02 +0530 | [diff] [blame] | 223 | return fscache_maybe_release_page(v9inode->fscache, page, gfp); |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 224 | } |
| 225 | |
| 226 | void __v9fs_fscache_invalidate_page(struct page *page) |
| 227 | { |
| 228 | struct inode *inode = page->mapping->host; |
Aneesh Kumar K.V | a78ce05 | 2011-02-28 17:04:02 +0530 | [diff] [blame] | 229 | struct v9fs_inode *v9inode = V9FS_I(inode); |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 230 | |
Aneesh Kumar K.V | a78ce05 | 2011-02-28 17:04:02 +0530 | [diff] [blame] | 231 | BUG_ON(!v9inode->fscache); |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 232 | |
| 233 | if (PageFsCache(page)) { |
Aneesh Kumar K.V | a78ce05 | 2011-02-28 17:04:02 +0530 | [diff] [blame] | 234 | fscache_wait_on_page_write(v9inode->fscache, page); |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 235 | BUG_ON(!PageLocked(page)); |
Aneesh Kumar K.V | a78ce05 | 2011-02-28 17:04:02 +0530 | [diff] [blame] | 236 | fscache_uncache_page(v9inode->fscache, page); |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 237 | } |
| 238 | } |
| 239 | |
| 240 | static void v9fs_vfs_readpage_complete(struct page *page, void *data, |
| 241 | int error) |
| 242 | { |
| 243 | if (!error) |
| 244 | SetPageUptodate(page); |
| 245 | |
| 246 | unlock_page(page); |
| 247 | } |
| 248 | |
| 249 | /** |
| 250 | * __v9fs_readpage_from_fscache - read a page from cache |
| 251 | * |
| 252 | * Returns 0 if the pages are in cache and a BIO is submitted, |
| 253 | * 1 if the pages are not in cache and -error otherwise. |
| 254 | */ |
| 255 | |
| 256 | int __v9fs_readpage_from_fscache(struct inode *inode, struct page *page) |
| 257 | { |
| 258 | int ret; |
Aneesh Kumar K.V | a78ce05 | 2011-02-28 17:04:02 +0530 | [diff] [blame] | 259 | const struct v9fs_inode *v9inode = V9FS_I(inode); |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 260 | |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 261 | p9_debug(P9_DEBUG_FSC, "inode %p page %p\n", inode, page); |
Aneesh Kumar K.V | a78ce05 | 2011-02-28 17:04:02 +0530 | [diff] [blame] | 262 | if (!v9inode->fscache) |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 263 | return -ENOBUFS; |
| 264 | |
Aneesh Kumar K.V | a78ce05 | 2011-02-28 17:04:02 +0530 | [diff] [blame] | 265 | ret = fscache_read_or_alloc_page(v9inode->fscache, |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 266 | page, |
| 267 | v9fs_vfs_readpage_complete, |
| 268 | NULL, |
| 269 | GFP_KERNEL); |
| 270 | switch (ret) { |
| 271 | case -ENOBUFS: |
| 272 | case -ENODATA: |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 273 | p9_debug(P9_DEBUG_FSC, "page/inode not in cache %d\n", ret); |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 274 | return 1; |
| 275 | case 0: |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 276 | p9_debug(P9_DEBUG_FSC, "BIO submitted\n"); |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 277 | return ret; |
| 278 | default: |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 279 | p9_debug(P9_DEBUG_FSC, "ret %d\n", ret); |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 280 | return ret; |
| 281 | } |
| 282 | } |
| 283 | |
| 284 | /** |
| 285 | * __v9fs_readpages_from_fscache - read multiple pages from cache |
| 286 | * |
| 287 | * Returns 0 if the pages are in cache and a BIO is submitted, |
| 288 | * 1 if the pages are not in cache and -error otherwise. |
| 289 | */ |
| 290 | |
| 291 | int __v9fs_readpages_from_fscache(struct inode *inode, |
| 292 | struct address_space *mapping, |
| 293 | struct list_head *pages, |
| 294 | unsigned *nr_pages) |
| 295 | { |
| 296 | int ret; |
Aneesh Kumar K.V | a78ce05 | 2011-02-28 17:04:02 +0530 | [diff] [blame] | 297 | const struct v9fs_inode *v9inode = V9FS_I(inode); |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 298 | |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 299 | p9_debug(P9_DEBUG_FSC, "inode %p pages %u\n", inode, *nr_pages); |
Aneesh Kumar K.V | a78ce05 | 2011-02-28 17:04:02 +0530 | [diff] [blame] | 300 | if (!v9inode->fscache) |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 301 | return -ENOBUFS; |
| 302 | |
Aneesh Kumar K.V | a78ce05 | 2011-02-28 17:04:02 +0530 | [diff] [blame] | 303 | ret = fscache_read_or_alloc_pages(v9inode->fscache, |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 304 | mapping, pages, nr_pages, |
| 305 | v9fs_vfs_readpage_complete, |
| 306 | NULL, |
| 307 | mapping_gfp_mask(mapping)); |
| 308 | switch (ret) { |
| 309 | case -ENOBUFS: |
| 310 | case -ENODATA: |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 311 | p9_debug(P9_DEBUG_FSC, "pages/inodes not in cache %d\n", ret); |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 312 | return 1; |
| 313 | case 0: |
| 314 | BUG_ON(!list_empty(pages)); |
| 315 | BUG_ON(*nr_pages != 0); |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 316 | p9_debug(P9_DEBUG_FSC, "BIO submitted\n"); |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 317 | return ret; |
| 318 | default: |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 319 | p9_debug(P9_DEBUG_FSC, "ret %d\n", ret); |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 320 | return ret; |
| 321 | } |
| 322 | } |
| 323 | |
| 324 | /** |
| 325 | * __v9fs_readpage_to_fscache - write a page to the cache |
| 326 | * |
| 327 | */ |
| 328 | |
| 329 | void __v9fs_readpage_to_fscache(struct inode *inode, struct page *page) |
| 330 | { |
| 331 | int ret; |
Aneesh Kumar K.V | a78ce05 | 2011-02-28 17:04:02 +0530 | [diff] [blame] | 332 | const struct v9fs_inode *v9inode = V9FS_I(inode); |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 333 | |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 334 | p9_debug(P9_DEBUG_FSC, "inode %p page %p\n", inode, page); |
David Howells | ee1235a | 2018-04-04 13:41:28 +0100 | [diff] [blame] | 335 | ret = fscache_write_page(v9inode->fscache, page, |
| 336 | i_size_read(&v9inode->vfs_inode), GFP_KERNEL); |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 337 | p9_debug(P9_DEBUG_FSC, "ret = %d\n", ret); |
Abhishek Kulkarni | 60e78d2 | 2009-09-23 13:00:27 -0500 | [diff] [blame] | 338 | if (ret != 0) |
| 339 | v9fs_uncache_page(inode, page); |
| 340 | } |
Aneesh Kumar K.V | 2efda79 | 2011-02-28 17:03:56 +0530 | [diff] [blame] | 341 | |
| 342 | /* |
| 343 | * wait for a page to complete writing to the cache |
| 344 | */ |
| 345 | void __v9fs_fscache_wait_on_page_write(struct inode *inode, struct page *page) |
| 346 | { |
Aneesh Kumar K.V | a78ce05 | 2011-02-28 17:04:02 +0530 | [diff] [blame] | 347 | const struct v9fs_inode *v9inode = V9FS_I(inode); |
Joe Perches | 5d38515 | 2011-11-28 10:40:46 -0800 | [diff] [blame] | 348 | p9_debug(P9_DEBUG_FSC, "inode %p page %p\n", inode, page); |
Aneesh Kumar K.V | 2efda79 | 2011-02-28 17:03:56 +0530 | [diff] [blame] | 349 | if (PageFsCache(page)) |
Aneesh Kumar K.V | a78ce05 | 2011-02-28 17:04:02 +0530 | [diff] [blame] | 350 | fscache_wait_on_page_write(v9inode->fscache, page); |
Aneesh Kumar K.V | 2efda79 | 2011-02-28 17:03:56 +0530 | [diff] [blame] | 351 | } |