Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland...
[linux-2.6.git] / fs / gfs2 / util.c
1 /*
2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
3  * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
4  *
5  * This copyrighted material is made available to anyone wishing to use,
6  * modify, copy, or redistribute it subject to the terms and conditions
7  * of the GNU General Public License version 2.
8  */
9
10 #include <linux/spinlock.h>
11 #include <linux/completion.h>
12 #include <linux/buffer_head.h>
13 #include <linux/crc32.h>
14 #include <linux/gfs2_ondisk.h>
15 #include <asm/uaccess.h>
16
17 #include "gfs2.h"
18 #include "incore.h"
19 #include "glock.h"
20 #include "util.h"
21
22 struct kmem_cache *gfs2_glock_cachep __read_mostly;
23 struct kmem_cache *gfs2_glock_aspace_cachep __read_mostly;
24 struct kmem_cache *gfs2_inode_cachep __read_mostly;
25 struct kmem_cache *gfs2_bufdata_cachep __read_mostly;
26 struct kmem_cache *gfs2_rgrpd_cachep __read_mostly;
27 struct kmem_cache *gfs2_quotad_cachep __read_mostly;
28
29 void gfs2_assert_i(struct gfs2_sbd *sdp)
30 {
31         printk(KERN_EMERG "GFS2: fsid=%s: fatal assertion failed\n",
32                sdp->sd_fsname);
33 }
34
35 int gfs2_lm_withdraw(struct gfs2_sbd *sdp, char *fmt, ...)
36 {
37         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
38         const struct lm_lockops *lm = ls->ls_ops;
39         va_list args;
40
41         if (sdp->sd_args.ar_errors == GFS2_ERRORS_WITHDRAW &&
42             test_and_set_bit(SDF_SHUTDOWN, &sdp->sd_flags))
43                 return 0;
44
45         va_start(args, fmt);
46         vprintk(fmt, args);
47         va_end(args);
48
49         if (sdp->sd_args.ar_errors == GFS2_ERRORS_WITHDRAW) {
50                 fs_err(sdp, "about to withdraw this file system\n");
51                 BUG_ON(sdp->sd_args.ar_debug);
52
53                 kobject_uevent(&sdp->sd_kobj, KOBJ_OFFLINE);
54
55                 if (lm->lm_unmount) {
56                         fs_err(sdp, "telling LM to unmount\n");
57                         lm->lm_unmount(sdp);
58                 }
59                 fs_err(sdp, "withdrawn\n");
60                 dump_stack();
61         }
62
63         if (sdp->sd_args.ar_errors == GFS2_ERRORS_PANIC)
64                 panic("GFS2: fsid=%s: panic requested.\n", sdp->sd_fsname);
65
66         return -1;
67 }
68
69 /**
70  * gfs2_assert_withdraw_i - Cause the machine to withdraw if @assertion is false
71  * Returns: -1 if this call withdrew the machine,
72  *          -2 if it was already withdrawn
73  */
74
75 int gfs2_assert_withdraw_i(struct gfs2_sbd *sdp, char *assertion,
76                            const char *function, char *file, unsigned int line)
77 {
78         int me;
79         me = gfs2_lm_withdraw(sdp,
80                 "GFS2: fsid=%s: fatal: assertion \"%s\" failed\n"
81                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
82                 sdp->sd_fsname, assertion,
83                 sdp->sd_fsname, function, file, line);
84         dump_stack();
85         return (me) ? -1 : -2;
86 }
87
88 /**
89  * gfs2_assert_warn_i - Print a message to the console if @assertion is false
90  * Returns: -1 if we printed something
91  *          -2 if we didn't
92  */
93
94 int gfs2_assert_warn_i(struct gfs2_sbd *sdp, char *assertion,
95                        const char *function, char *file, unsigned int line)
96 {
97         if (time_before(jiffies,
98                         sdp->sd_last_warning +
99                         gfs2_tune_get(sdp, gt_complain_secs) * HZ))
100                 return -2;
101
102         if (sdp->sd_args.ar_errors == GFS2_ERRORS_WITHDRAW)
103                 printk(KERN_WARNING
104                        "GFS2: fsid=%s: warning: assertion \"%s\" failed\n"
105                        "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
106                        sdp->sd_fsname, assertion,
107                        sdp->sd_fsname, function, file, line);
108
109         if (sdp->sd_args.ar_debug)
110                 BUG();
111         else
112                 dump_stack();
113
114         if (sdp->sd_args.ar_errors == GFS2_ERRORS_PANIC)
115                 panic("GFS2: fsid=%s: warning: assertion \"%s\" failed\n"
116                       "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
117                       sdp->sd_fsname, assertion,
118                       sdp->sd_fsname, function, file, line);
119
120         sdp->sd_last_warning = jiffies;
121
122         return -1;
123 }
124
125 /**
126  * gfs2_consist_i - Flag a filesystem consistency error and withdraw
127  * Returns: -1 if this call withdrew the machine,
128  *          0 if it was already withdrawn
129  */
130
131 int gfs2_consist_i(struct gfs2_sbd *sdp, int cluster_wide, const char *function,
132                    char *file, unsigned int line)
133 {
134         int rv;
135         rv = gfs2_lm_withdraw(sdp,
136                 "GFS2: fsid=%s: fatal: filesystem consistency error\n"
137                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
138                 sdp->sd_fsname,
139                 sdp->sd_fsname, function, file, line);
140         return rv;
141 }
142
143 /**
144  * gfs2_consist_inode_i - Flag an inode consistency error and withdraw
145  * Returns: -1 if this call withdrew the machine,
146  *          0 if it was already withdrawn
147  */
148
149 int gfs2_consist_inode_i(struct gfs2_inode *ip, int cluster_wide,
150                          const char *function, char *file, unsigned int line)
151 {
152         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
153         int rv;
154         rv = gfs2_lm_withdraw(sdp,
155                 "GFS2: fsid=%s: fatal: filesystem consistency error\n"
156                 "GFS2: fsid=%s:   inode = %llu %llu\n"
157                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
158                 sdp->sd_fsname,
159                 sdp->sd_fsname, (unsigned long long)ip->i_no_formal_ino,
160                 (unsigned long long)ip->i_no_addr,
161                 sdp->sd_fsname, function, file, line);
162         return rv;
163 }
164
165 /**
166  * gfs2_consist_rgrpd_i - Flag a RG consistency error and withdraw
167  * Returns: -1 if this call withdrew the machine,
168  *          0 if it was already withdrawn
169  */
170
171 int gfs2_consist_rgrpd_i(struct gfs2_rgrpd *rgd, int cluster_wide,
172                          const char *function, char *file, unsigned int line)
173 {
174         struct gfs2_sbd *sdp = rgd->rd_sbd;
175         int rv;
176         rv = gfs2_lm_withdraw(sdp,
177                 "GFS2: fsid=%s: fatal: filesystem consistency error\n"
178                 "GFS2: fsid=%s:   RG = %llu\n"
179                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
180                 sdp->sd_fsname,
181                 sdp->sd_fsname, (unsigned long long)rgd->rd_addr,
182                 sdp->sd_fsname, function, file, line);
183         return rv;
184 }
185
186 /**
187  * gfs2_meta_check_ii - Flag a magic number consistency error and withdraw
188  * Returns: -1 if this call withdrew the machine,
189  *          -2 if it was already withdrawn
190  */
191
192 int gfs2_meta_check_ii(struct gfs2_sbd *sdp, struct buffer_head *bh,
193                        const char *type, const char *function, char *file,
194                        unsigned int line)
195 {
196         int me;
197         me = gfs2_lm_withdraw(sdp,
198                 "GFS2: fsid=%s: fatal: invalid metadata block\n"
199                 "GFS2: fsid=%s:   bh = %llu (%s)\n"
200                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
201                 sdp->sd_fsname,
202                 sdp->sd_fsname, (unsigned long long)bh->b_blocknr, type,
203                 sdp->sd_fsname, function, file, line);
204         return (me) ? -1 : -2;
205 }
206
207 /**
208  * gfs2_metatype_check_ii - Flag a metadata type consistency error and withdraw
209  * Returns: -1 if this call withdrew the machine,
210  *          -2 if it was already withdrawn
211  */
212
213 int gfs2_metatype_check_ii(struct gfs2_sbd *sdp, struct buffer_head *bh,
214                            u16 type, u16 t, const char *function,
215                            char *file, unsigned int line)
216 {
217         int me;
218         me = gfs2_lm_withdraw(sdp,
219                 "GFS2: fsid=%s: fatal: invalid metadata block\n"
220                 "GFS2: fsid=%s:   bh = %llu (type: exp=%u, found=%u)\n"
221                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
222                 sdp->sd_fsname,
223                 sdp->sd_fsname, (unsigned long long)bh->b_blocknr, type, t,
224                 sdp->sd_fsname, function, file, line);
225         return (me) ? -1 : -2;
226 }
227
228 /**
229  * gfs2_io_error_i - Flag an I/O error and withdraw
230  * Returns: -1 if this call withdrew the machine,
231  *          0 if it was already withdrawn
232  */
233
234 int gfs2_io_error_i(struct gfs2_sbd *sdp, const char *function, char *file,
235                     unsigned int line)
236 {
237         int rv;
238         rv = gfs2_lm_withdraw(sdp,
239                 "GFS2: fsid=%s: fatal: I/O error\n"
240                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
241                 sdp->sd_fsname,
242                 sdp->sd_fsname, function, file, line);
243         return rv;
244 }
245
246 /**
247  * gfs2_io_error_bh_i - Flag a buffer I/O error and withdraw
248  * Returns: -1 if this call withdrew the machine,
249  *          0 if it was already withdrawn
250  */
251
252 int gfs2_io_error_bh_i(struct gfs2_sbd *sdp, struct buffer_head *bh,
253                        const char *function, char *file, unsigned int line)
254 {
255         int rv;
256         rv = gfs2_lm_withdraw(sdp,
257                 "GFS2: fsid=%s: fatal: I/O error\n"
258                 "GFS2: fsid=%s:   block = %llu\n"
259                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
260                 sdp->sd_fsname,
261                 sdp->sd_fsname, (unsigned long long)bh->b_blocknr,
262                 sdp->sd_fsname, function, file, line);
263         return rv;
264 }
265
266 void gfs2_icbit_munge(struct gfs2_sbd *sdp, unsigned char **bitmap,
267                       unsigned int bit, int new_value)
268 {
269         unsigned int c, o, b = bit;
270         int old_value;
271
272         c = b / (8 * PAGE_SIZE);
273         b %= 8 * PAGE_SIZE;
274         o = b / 8;
275         b %= 8;
276
277         old_value = (bitmap[c][o] & (1 << b));
278         gfs2_assert_withdraw(sdp, !old_value != !new_value);
279
280         if (new_value)
281                 bitmap[c][o] |= 1 << b;
282         else
283                 bitmap[c][o] &= ~(1 << b);
284 }
285