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Suresh Jayaraman488f1d2d2010-07-05 18:12:15 +05301/*
2 * fs/cifs/fscache.c - CIFS filesystem cache interface
3 *
4 * Copyright (c) 2010 Novell, Inc.
Suresh Jayaramanb81209d2010-11-24 17:49:06 +05305 * Author(s): Suresh Jayaraman <sjayaraman@suse.de>
Suresh Jayaraman488f1d2d2010-07-05 18:12:15 +05306 *
7 * This library is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU Lesser General Public License as published
9 * by the Free Software Foundation; either version 2.1 of the License, or
10 * (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
15 * the GNU Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21#include "fscache.h"
22#include "cifsglob.h"
23#include "cifs_debug.h"
Suresh Jayaraman9451a9a2010-07-05 18:12:45 +053024#include "cifs_fs_sb.h"
Suresh Jayaraman488f1d2d2010-07-05 18:12:15 +053025
26void cifs_fscache_get_client_cookie(struct TCP_Server_Info *server)
27{
28 server->fscache =
29 fscache_acquire_cookie(cifs_fscache_netfs.primary_index,
30 &cifs_fscache_server_index_def, server);
31 cFYI(1, "CIFS: get client cookie (0x%p/0x%p)", server,
32 server->fscache);
33}
34
35void cifs_fscache_release_client_cookie(struct TCP_Server_Info *server)
36{
37 cFYI(1, "CIFS: release client cookie (0x%p/0x%p)", server,
38 server->fscache);
39 fscache_relinquish_cookie(server->fscache, 0);
40 server->fscache = NULL;
41}
42
Suresh Jayaramand03382c2010-07-05 18:12:27 +053043void cifs_fscache_get_super_cookie(struct cifsTconInfo *tcon)
44{
45 struct TCP_Server_Info *server = tcon->ses->server;
46
47 tcon->fscache =
48 fscache_acquire_cookie(server->fscache,
49 &cifs_fscache_super_index_def, tcon);
50 cFYI(1, "CIFS: get superblock cookie (0x%p/0x%p)",
51 server->fscache, tcon->fscache);
52}
53
54void cifs_fscache_release_super_cookie(struct cifsTconInfo *tcon)
55{
56 cFYI(1, "CIFS: releasing superblock cookie (0x%p)", tcon->fscache);
57 fscache_relinquish_cookie(tcon->fscache, 0);
58 tcon->fscache = NULL;
59}
Suresh Jayaraman9451a9a2010-07-05 18:12:45 +053060
61static void cifs_fscache_enable_inode_cookie(struct inode *inode)
62{
63 struct cifsInodeInfo *cifsi = CIFS_I(inode);
64 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
Jeff Layton0d424ad2010-09-20 16:01:35 -070065 struct cifsTconInfo *tcon = cifs_sb_master_tcon(cifs_sb);
Suresh Jayaraman9451a9a2010-07-05 18:12:45 +053066
67 if (cifsi->fscache)
68 return;
69
Suresh Jayaramanb81209d2010-11-24 17:49:06 +053070 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE) {
71 cifsi->fscache = fscache_acquire_cookie(tcon->fscache,
Jeff Layton0d424ad2010-09-20 16:01:35 -070072 &cifs_fscache_inode_object_def, cifsi);
Suresh Jayaramanb81209d2010-11-24 17:49:06 +053073 cFYI(1, "CIFS: got FH cookie (0x%p/0x%p)", tcon->fscache,
Jeff Layton0d424ad2010-09-20 16:01:35 -070074 cifsi->fscache);
Suresh Jayaramanb81209d2010-11-24 17:49:06 +053075 }
Suresh Jayaraman9451a9a2010-07-05 18:12:45 +053076}
77
78void cifs_fscache_release_inode_cookie(struct inode *inode)
79{
80 struct cifsInodeInfo *cifsi = CIFS_I(inode);
81
82 if (cifsi->fscache) {
83 cFYI(1, "CIFS releasing inode cookie (0x%p)",
84 cifsi->fscache);
85 fscache_relinquish_cookie(cifsi->fscache, 0);
86 cifsi->fscache = NULL;
87 }
88}
89
90static void cifs_fscache_disable_inode_cookie(struct inode *inode)
91{
92 struct cifsInodeInfo *cifsi = CIFS_I(inode);
93
94 if (cifsi->fscache) {
95 cFYI(1, "CIFS disabling inode cookie (0x%p)",
96 cifsi->fscache);
97 fscache_relinquish_cookie(cifsi->fscache, 1);
98 cifsi->fscache = NULL;
99 }
100}
101
102void cifs_fscache_set_inode_cookie(struct inode *inode, struct file *filp)
103{
104 if ((filp->f_flags & O_ACCMODE) != O_RDONLY)
105 cifs_fscache_disable_inode_cookie(inode);
Suresh Jayaramanb81209d2010-11-24 17:49:06 +0530106 else
Suresh Jayaraman9451a9a2010-07-05 18:12:45 +0530107 cifs_fscache_enable_inode_cookie(inode);
Suresh Jayaraman9451a9a2010-07-05 18:12:45 +0530108}
109
110void cifs_fscache_reset_inode_cookie(struct inode *inode)
111{
112 struct cifsInodeInfo *cifsi = CIFS_I(inode);
113 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
114 struct fscache_cookie *old = cifsi->fscache;
115
116 if (cifsi->fscache) {
117 /* retire the current fscache cache and get a new one */
118 fscache_relinquish_cookie(cifsi->fscache, 1);
119
Jeff Laytona6e8a842010-09-20 16:01:33 -0700120 cifsi->fscache = fscache_acquire_cookie(
Jeff Layton0d424ad2010-09-20 16:01:35 -0700121 cifs_sb_master_tcon(cifs_sb)->fscache,
Suresh Jayaraman9451a9a2010-07-05 18:12:45 +0530122 &cifs_fscache_inode_object_def,
123 cifsi);
124 cFYI(1, "CIFS: new cookie 0x%p oldcookie 0x%p",
125 cifsi->fscache, old);
126 }
127}
Suresh Jayaraman85f2d6b2010-07-05 18:13:00 +0530128
129int cifs_fscache_release_page(struct page *page, gfp_t gfp)
130{
131 if (PageFsCache(page)) {
132 struct inode *inode = page->mapping->host;
133 struct cifsInodeInfo *cifsi = CIFS_I(inode);
134
135 cFYI(1, "CIFS: fscache release page (0x%p/0x%p)",
136 page, cifsi->fscache);
137 if (!fscache_maybe_release_page(cifsi->fscache, page, gfp))
138 return 0;
139 }
140
141 return 1;
142}
143
Suresh Jayaraman56698232010-07-05 18:13:25 +0530144static void cifs_readpage_from_fscache_complete(struct page *page, void *ctx,
145 int error)
146{
147 cFYI(1, "CFS: readpage_from_fscache_complete (0x%p/%d)",
148 page, error);
149 if (!error)
150 SetPageUptodate(page);
151 unlock_page(page);
152}
153
154/*
155 * Retrieve a page from FS-Cache
156 */
157int __cifs_readpage_from_fscache(struct inode *inode, struct page *page)
158{
159 int ret;
160
161 cFYI(1, "CIFS: readpage_from_fscache(fsc:%p, p:%p, i:0x%p",
162 CIFS_I(inode)->fscache, page, inode);
163 ret = fscache_read_or_alloc_page(CIFS_I(inode)->fscache, page,
164 cifs_readpage_from_fscache_complete,
165 NULL,
166 GFP_KERNEL);
167 switch (ret) {
168
169 case 0: /* page found in fscache, read submitted */
170 cFYI(1, "CIFS: readpage_from_fscache: submitted");
171 return ret;
172 case -ENOBUFS: /* page won't be cached */
173 case -ENODATA: /* page not in cache */
174 cFYI(1, "CIFS: readpage_from_fscache %d", ret);
175 return 1;
176
177 default:
178 cERROR(1, "unknown error ret = %d", ret);
179 }
180 return ret;
181}
182
183/*
184 * Retrieve a set of pages from FS-Cache
185 */
186int __cifs_readpages_from_fscache(struct inode *inode,
187 struct address_space *mapping,
188 struct list_head *pages,
189 unsigned *nr_pages)
190{
191 int ret;
192
193 cFYI(1, "CIFS: __cifs_readpages_from_fscache (0x%p/%u/0x%p)",
194 CIFS_I(inode)->fscache, *nr_pages, inode);
195 ret = fscache_read_or_alloc_pages(CIFS_I(inode)->fscache, mapping,
196 pages, nr_pages,
197 cifs_readpage_from_fscache_complete,
198 NULL,
199 mapping_gfp_mask(mapping));
200 switch (ret) {
201 case 0: /* read submitted to the cache for all pages */
202 cFYI(1, "CIFS: readpages_from_fscache: submitted");
203 return ret;
204
205 case -ENOBUFS: /* some pages are not cached and can't be */
206 case -ENODATA: /* some pages are not cached */
207 cFYI(1, "CIFS: readpages_from_fscache: no page");
208 return 1;
209
210 default:
211 cFYI(1, "unknown error ret = %d", ret);
212 }
213
214 return ret;
215}
216
Suresh Jayaraman9dc06552010-07-05 18:13:11 +0530217void __cifs_readpage_to_fscache(struct inode *inode, struct page *page)
218{
219 int ret;
220
221 cFYI(1, "CIFS: readpage_to_fscache(fsc: %p, p: %p, i: %p",
222 CIFS_I(inode)->fscache, page, inode);
223 ret = fscache_write_page(CIFS_I(inode)->fscache, page, GFP_KERNEL);
224 if (ret != 0)
225 fscache_uncache_page(CIFS_I(inode)->fscache, page);
226}
227
Suresh Jayaraman85f2d6b2010-07-05 18:13:00 +0530228void __cifs_fscache_invalidate_page(struct page *page, struct inode *inode)
229{
230 struct cifsInodeInfo *cifsi = CIFS_I(inode);
231 struct fscache_cookie *cookie = cifsi->fscache;
232
233 cFYI(1, "CIFS: fscache invalidatepage (0x%p/0x%p)", page, cookie);
234 fscache_wait_on_page_write(cookie, page);
235 fscache_uncache_page(cookie, page);
236}
237