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1 /*
2 * fs/cifs/fscache.c - CIFS filesystem cache interface
3 *
4 * Copyright (c) 2010 Novell, Inc.
5 * Author(s): Suresh Jayaraman <sjayaraman@suse.de>
6 *
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"
24 #include "cifs_fs_sb.h"
25
26 void 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, true);
31 cifs_dbg(FYI, "%s: (0x%p/0x%p)\n",
32 __func__, server, server->fscache);
33 }
34
35 void cifs_fscache_release_client_cookie(struct TCP_Server_Info *server)
36 {
37 cifs_dbg(FYI, "%s: (0x%p/0x%p)\n",
38 __func__, server, server->fscache);
39 fscache_relinquish_cookie(server->fscache, 0);
40 server->fscache = NULL;
41 }
42
43 void cifs_fscache_get_super_cookie(struct cifs_tcon *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, true);
50 cifs_dbg(FYI, "%s: (0x%p/0x%p)\n",
51 __func__, server->fscache, tcon->fscache);
52 }
53
54 void cifs_fscache_release_super_cookie(struct cifs_tcon *tcon)
55 {
56 cifs_dbg(FYI, "%s: (0x%p)\n", __func__, tcon->fscache);
57 fscache_relinquish_cookie(tcon->fscache, 0);
58 tcon->fscache = NULL;
59 }
60
61 static 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);
65 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
66
67 if (cifsi->fscache)
68 return;
69
70 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE) {
71 cifsi->fscache = fscache_acquire_cookie(tcon->fscache,
72 &cifs_fscache_inode_object_def, cifsi, true);
73 cifs_dbg(FYI, "%s: got FH cookie (0x%p/0x%p)\n",
74 __func__, tcon->fscache, cifsi->fscache);
75 }
76 }
77
78 void cifs_fscache_release_inode_cookie(struct inode *inode)
79 {
80 struct cifsInodeInfo *cifsi = CIFS_I(inode);
81
82 if (cifsi->fscache) {
83 cifs_dbg(FYI, "%s: (0x%p)\n", __func__, cifsi->fscache);
84 fscache_relinquish_cookie(cifsi->fscache, 0);
85 cifsi->fscache = NULL;
86 }
87 }
88
89 static void cifs_fscache_disable_inode_cookie(struct inode *inode)
90 {
91 struct cifsInodeInfo *cifsi = CIFS_I(inode);
92
93 if (cifsi->fscache) {
94 cifs_dbg(FYI, "%s: (0x%p)\n", __func__, cifsi->fscache);
95 fscache_uncache_all_inode_pages(cifsi->fscache, inode);
96 fscache_relinquish_cookie(cifsi->fscache, 1);
97 cifsi->fscache = NULL;
98 }
99 }
100
101 void cifs_fscache_set_inode_cookie(struct inode *inode, struct file *filp)
102 {
103 if ((filp->f_flags & O_ACCMODE) != O_RDONLY)
104 cifs_fscache_disable_inode_cookie(inode);
105 else
106 cifs_fscache_enable_inode_cookie(inode);
107 }
108
109 void cifs_fscache_reset_inode_cookie(struct inode *inode)
110 {
111 struct cifsInodeInfo *cifsi = CIFS_I(inode);
112 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
113 struct fscache_cookie *old = cifsi->fscache;
114
115 if (cifsi->fscache) {
116 /* retire the current fscache cache and get a new one */
117 fscache_relinquish_cookie(cifsi->fscache, 1);
118
119 cifsi->fscache = fscache_acquire_cookie(
120 cifs_sb_master_tcon(cifs_sb)->fscache,
121 &cifs_fscache_inode_object_def,
122 cifsi, true);
123 cifs_dbg(FYI, "%s: new cookie 0x%p oldcookie 0x%p\n",
124 __func__, cifsi->fscache, old);
125 }
126 }
127
128 int cifs_fscache_release_page(struct page *page, gfp_t gfp)
129 {
130 if (PageFsCache(page)) {
131 struct inode *inode = page->mapping->host;
132 struct cifsInodeInfo *cifsi = CIFS_I(inode);
133
134 cifs_dbg(FYI, "%s: (0x%p/0x%p)\n",
135 __func__, page, cifsi->fscache);
136 if (!fscache_maybe_release_page(cifsi->fscache, page, gfp))
137 return 0;
138 }
139
140 return 1;
141 }
142
143 static void cifs_readpage_from_fscache_complete(struct page *page, void *ctx,
144 int error)
145 {
146 cifs_dbg(FYI, "%s: (0x%p/%d)\n", __func__, page, error);
147 if (!error)
148 SetPageUptodate(page);
149 unlock_page(page);
150 }
151
152 /*
153 * Retrieve a page from FS-Cache
154 */
155 int __cifs_readpage_from_fscache(struct inode *inode, struct page *page)
156 {
157 int ret;
158
159 cifs_dbg(FYI, "%s: (fsc:%p, p:%p, i:0x%p\n",
160 __func__, CIFS_I(inode)->fscache, page, inode);
161 ret = fscache_read_or_alloc_page(CIFS_I(inode)->fscache, page,
162 cifs_readpage_from_fscache_complete,
163 NULL,
164 GFP_KERNEL);
165 switch (ret) {
166
167 case 0: /* page found in fscache, read submitted */
168 cifs_dbg(FYI, "%s: submitted\n", __func__);
169 return ret;
170 case -ENOBUFS: /* page won't be cached */
171 case -ENODATA: /* page not in cache */
172 cifs_dbg(FYI, "%s: %d\n", __func__, ret);
173 return 1;
174
175 default:
176 cifs_dbg(VFS, "unknown error ret = %d\n", ret);
177 }
178 return ret;
179 }
180
181 /*
182 * Retrieve a set of pages from FS-Cache
183 */
184 int __cifs_readpages_from_fscache(struct inode *inode,
185 struct address_space *mapping,
186 struct list_head *pages,
187 unsigned *nr_pages)
188 {
189 int ret;
190
191 cifs_dbg(FYI, "%s: (0x%p/%u/0x%p)\n",
192 __func__, CIFS_I(inode)->fscache, *nr_pages, inode);
193 ret = fscache_read_or_alloc_pages(CIFS_I(inode)->fscache, mapping,
194 pages, nr_pages,
195 cifs_readpage_from_fscache_complete,
196 NULL,
197 mapping_gfp_mask(mapping));
198 switch (ret) {
199 case 0: /* read submitted to the cache for all pages */
200 cifs_dbg(FYI, "%s: submitted\n", __func__);
201 return ret;
202
203 case -ENOBUFS: /* some pages are not cached and can't be */
204 case -ENODATA: /* some pages are not cached */
205 cifs_dbg(FYI, "%s: no page\n", __func__);
206 return 1;
207
208 default:
209 cifs_dbg(FYI, "unknown error ret = %d\n", ret);
210 }
211
212 return ret;
213 }
214
215 void __cifs_readpage_to_fscache(struct inode *inode, struct page *page)
216 {
217 int ret;
218
219 cifs_dbg(FYI, "%s: (fsc: %p, p: %p, i: %p)\n",
220 __func__, CIFS_I(inode)->fscache, page, inode);
221 ret = fscache_write_page(CIFS_I(inode)->fscache, page, GFP_KERNEL);
222 if (ret != 0)
223 fscache_uncache_page(CIFS_I(inode)->fscache, page);
224 }
225
226 void __cifs_fscache_readpages_cancel(struct inode *inode, struct list_head *pages)
227 {
228 cifs_dbg(FYI, "%s: (fsc: %p, i: %p)\n",
229 __func__, CIFS_I(inode)->fscache, inode);
230 fscache_readpages_cancel(CIFS_I(inode)->fscache, pages);
231 }
232
233 void __cifs_fscache_invalidate_page(struct page *page, struct inode *inode)
234 {
235 struct cifsInodeInfo *cifsi = CIFS_I(inode);
236 struct fscache_cookie *cookie = cifsi->fscache;
237
238 cifs_dbg(FYI, "%s: (0x%p/0x%p)\n", __func__, page, cookie);
239 fscache_wait_on_page_write(cookie, page);
240 fscache_uncache_page(cookie, page);
241 }
242