[PATCH] Make XFS use BH_Unwritten and BH_Delay correctly
[linux-2.6] / fs / xfs / linux-2.6 / xfs_sysctl.c
1 /*
2  * Copyright (c) 2001-2005 Silicon Graphics, Inc.
3  * All Rights Reserved.
4  *
5  * This program is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU General Public License as
7  * published by the Free Software Foundation.
8  *
9  * This program is distributed in the hope that it would be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  * GNU General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program; if not, write the Free Software Foundation,
16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
17  */
18 #include "xfs.h"
19 #include <linux/sysctl.h>
20 #include <linux/proc_fs.h>
21
22 static struct ctl_table_header *xfs_table_header;
23
24 #ifdef CONFIG_PROC_FS
25 STATIC int
26 xfs_stats_clear_proc_handler(
27         ctl_table       *ctl,
28         int             write,
29         struct file     *filp,
30         void            __user *buffer,
31         size_t          *lenp,
32         loff_t          *ppos)
33 {
34         int             c, ret, *valp = ctl->data;
35         __uint32_t      vn_active;
36
37         ret = proc_dointvec_minmax(ctl, write, filp, buffer, lenp, ppos);
38
39         if (!ret && write && *valp) {
40                 printk("XFS Clearing xfsstats\n");
41                 for_each_possible_cpu(c) {
42                         preempt_disable();
43                         /* save vn_active, it's a universal truth! */
44                         vn_active = per_cpu(xfsstats, c).vn_active;
45                         memset(&per_cpu(xfsstats, c), 0,
46                                sizeof(struct xfsstats));
47                         per_cpu(xfsstats, c).vn_active = vn_active;
48                         preempt_enable();
49                 }
50                 xfs_stats_clear = 0;
51         }
52
53         return ret;
54 }
55 #endif /* CONFIG_PROC_FS */
56
57 static ctl_table xfs_table[] = {
58         {
59                 .ctl_name       = XFS_RESTRICT_CHOWN,
60                 .procname       = "restrict_chown",
61                 .data           = &xfs_params.restrict_chown.val,
62                 .maxlen         = sizeof(int),
63                 .mode           = 0644,
64                 .proc_handler   = &proc_dointvec_minmax,
65                 .strategy       = &sysctl_intvec,
66                 .extra1         = &xfs_params.restrict_chown.min,
67                 .extra2         = &xfs_params.restrict_chown.max
68         },
69         {
70                 .ctl_name       = XFS_SGID_INHERIT,
71                 .procname       = "irix_sgid_inherit",
72                 .data           = &xfs_params.sgid_inherit.val,
73                 .maxlen         = sizeof(int),
74                 .mode           = 0644,
75                 .proc_handler   = &proc_dointvec_minmax,
76                 .strategy       = &sysctl_intvec,
77                 .extra1         = &xfs_params.sgid_inherit.min,
78                 .extra2         = &xfs_params.sgid_inherit.max
79         },
80         {
81                 .ctl_name       = XFS_SYMLINK_MODE,
82                 .procname       = "irix_symlink_mode",
83                 .data           = &xfs_params.symlink_mode.val,
84                 .maxlen         = sizeof(int),
85                 .mode           = 0644,
86                 .proc_handler   = &proc_dointvec_minmax,
87                 .strategy       = &sysctl_intvec,
88                 .extra1         = &xfs_params.symlink_mode.min,
89                 .extra2         = &xfs_params.symlink_mode.max
90         },
91         {
92                 .ctl_name       = XFS_PANIC_MASK,
93                 .procname       = "panic_mask",
94                 .data           = &xfs_params.panic_mask.val,
95                 .maxlen         = sizeof(int),
96                 .mode           = 0644,
97                 .proc_handler   = &proc_dointvec_minmax,
98                 .strategy       = &sysctl_intvec,
99                 .extra1         = &xfs_params.panic_mask.min,
100                 .extra2         = &xfs_params.panic_mask.max
101         },
102
103         {
104                 .ctl_name       = XFS_ERRLEVEL,
105                 .procname       = "error_level",
106                 .data           = &xfs_params.error_level.val,
107                 .maxlen         = sizeof(int),
108                 .mode           = 0644,
109                 .proc_handler   = &proc_dointvec_minmax,
110                 .strategy       = &sysctl_intvec,
111                 .extra1         = &xfs_params.error_level.min,
112                 .extra2         = &xfs_params.error_level.max
113         },
114         {
115                 .ctl_name       = XFS_SYNCD_TIMER,
116                 .procname       = "xfssyncd_centisecs",
117                 .data           = &xfs_params.syncd_timer.val,
118                 .maxlen         = sizeof(int),
119                 .mode           = 0644,
120                 .proc_handler   = &proc_dointvec_minmax,
121                 .strategy       = &sysctl_intvec,
122                 .extra1         = &xfs_params.syncd_timer.min,
123                 .extra2         = &xfs_params.syncd_timer.max
124         },
125         {
126                 .ctl_name       = XFS_INHERIT_SYNC,
127                 .procname       = "inherit_sync",
128                 .data           = &xfs_params.inherit_sync.val,
129                 .maxlen         = sizeof(int),
130                 .mode           = 0644,
131                 .proc_handler   = &proc_dointvec_minmax,
132                 .strategy       = &sysctl_intvec,
133                 .extra1         = &xfs_params.inherit_sync.min,
134                 .extra2         = &xfs_params.inherit_sync.max
135         },
136         {
137                 .ctl_name       = XFS_INHERIT_NODUMP,
138                 .procname       = "inherit_nodump",
139                 .data           = &xfs_params.inherit_nodump.val,
140                 .maxlen         = sizeof(int),
141                 .mode           = 0644,
142                 .proc_handler   = &proc_dointvec_minmax,
143                 .strategy       = &sysctl_intvec,
144                 .extra1         = &xfs_params.inherit_nodump.min,
145                 .extra2         = &xfs_params.inherit_nodump.max
146         },
147         {
148                 .ctl_name       = XFS_INHERIT_NOATIME,
149                 .procname       = "inherit_noatime",
150                 .data           = &xfs_params.inherit_noatim.val,
151                 .maxlen         = sizeof(int),
152                 .mode           = 0644,
153                 .proc_handler   = &proc_dointvec_minmax,
154                 .strategy       = &sysctl_intvec,
155                 .extra1         = &xfs_params.inherit_noatim.min,
156                 .extra2         = &xfs_params.inherit_noatim.max
157         },
158         {
159                 .ctl_name       = XFS_BUF_TIMER,
160                 .procname       = "xfsbufd_centisecs",
161                 .data           = &xfs_params.xfs_buf_timer.val,
162                 .maxlen         = sizeof(int),
163                 .mode           = 0644,
164                 .proc_handler   = &proc_dointvec_minmax,
165                 .strategy       = &sysctl_intvec,
166                 .extra1         = &xfs_params.xfs_buf_timer.min,
167                 .extra2         = &xfs_params.xfs_buf_timer.max
168         },
169         {
170                 .ctl_name       = XFS_BUF_AGE,
171                 .procname       = "age_buffer_centisecs",
172                 .data           = &xfs_params.xfs_buf_age.val,
173                 .maxlen         = sizeof(int),
174                 .mode           = 0644,
175                 .proc_handler   = &proc_dointvec_minmax,
176                 .strategy       = &sysctl_intvec,
177                 .extra1         = &xfs_params.xfs_buf_age.min,
178                 .extra2         = &xfs_params.xfs_buf_age.max
179         },
180         {
181                 .ctl_name       = XFS_INHERIT_NOSYM,
182                 .procname       = "inherit_nosymlinks",
183                 .data           = &xfs_params.inherit_nosym.val,
184                 .maxlen         = sizeof(int),
185                 .mode           = 0644,
186                 .proc_handler   = &proc_dointvec_minmax,
187                 .strategy       = &sysctl_intvec,
188                 .extra1         = &xfs_params.inherit_nosym.min,
189                 .extra2         = &xfs_params.inherit_nosym.max
190         },
191         {
192                 .ctl_name       = XFS_ROTORSTEP,
193                 .procname       = "rotorstep",
194                 .data           = &xfs_params.rotorstep.val,
195                 .maxlen         = sizeof(int),
196                 .mode           = 0644,
197                 .proc_handler   = &proc_dointvec_minmax,
198                 .strategy       = &sysctl_intvec,
199                 .extra1         = &xfs_params.rotorstep.min,
200                 .extra2         = &xfs_params.rotorstep.max
201         },
202         {
203                 .ctl_name       = XFS_INHERIT_NODFRG,
204                 .procname       = "inherit_nodefrag",
205                 .data           = &xfs_params.inherit_nodfrg.val,
206                 .maxlen         = sizeof(int),
207                 .mode           = 0644,
208                 .proc_handler   = &proc_dointvec_minmax,
209                 .strategy       = &sysctl_intvec,
210                 .extra1         = &xfs_params.inherit_nodfrg.min,
211                 .extra2         = &xfs_params.inherit_nodfrg.max
212         },
213         /* please keep this the last entry */
214 #ifdef CONFIG_PROC_FS
215         {
216                 .ctl_name       = XFS_STATS_CLEAR,
217                 .procname       = "stats_clear",
218                 .data           = &xfs_params.stats_clear.val,
219                 .maxlen         = sizeof(int),
220                 .mode           = 0644,
221                 .proc_handler   = &xfs_stats_clear_proc_handler,
222                 .strategy       = &sysctl_intvec,
223                 .extra1         = &xfs_params.stats_clear.min,
224                 .extra2         = &xfs_params.stats_clear.max
225         },
226 #endif /* CONFIG_PROC_FS */
227
228         {}
229 };
230
231 static ctl_table xfs_dir_table[] = {
232         {
233                 .ctl_name       = FS_XFS,
234                 .procname       = "xfs",
235                 .mode           = 0555,
236                 .child          = xfs_table
237         },
238         {}
239 };
240
241 static ctl_table xfs_root_table[] = {
242         {
243                 .ctl_name       = CTL_FS,
244                 .procname       = "fs",
245                 .mode           = 0555,
246                 .child          = xfs_dir_table
247         },
248         {}
249 };
250
251 void
252 xfs_sysctl_register(void)
253 {
254         xfs_table_header = register_sysctl_table(xfs_root_table, 0);
255 }
256
257 void
258 xfs_sysctl_unregister(void)
259 {
260         if (xfs_table_header)
261                 unregister_sysctl_table(xfs_table_header);
262 }