7c3806c674064cd5669e1645ade0a3fe8f52966b
[linux-2.6.git] / fs / gfs2 / util.c
1 /*
2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
3  * Copyright (C) 2004-2005 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 v.2.
8  */
9
10 #include <linux/sched.h>
11 #include <linux/slab.h>
12 #include <linux/spinlock.h>
13 #include <linux/completion.h>
14 #include <linux/buffer_head.h>
15 #include <linux/crc32.h>
16 #include <linux/gfs2_ondisk.h>
17 #include <asm/uaccess.h>
18
19 #include "gfs2.h"
20 #include "lm_interface.h"
21 #include "incore.h"
22 #include "glock.h"
23 #include "lm.h"
24 #include "util.h"
25
26 kmem_cache_t *gfs2_glock_cachep __read_mostly;
27 kmem_cache_t *gfs2_inode_cachep __read_mostly;
28 kmem_cache_t *gfs2_bufdata_cachep __read_mostly;
29
30 void gfs2_assert_i(struct gfs2_sbd *sdp)
31 {
32         printk(KERN_EMERG "GFS2: fsid=%s: fatal assertion failed\n",
33                sdp->sd_fsname);
34 }
35
36 /**
37  * gfs2_assert_withdraw_i - Cause the machine to withdraw if @assertion is false
38  * Returns: -1 if this call withdrew the machine,
39  *          -2 if it was already withdrawn
40  */
41
42 int gfs2_assert_withdraw_i(struct gfs2_sbd *sdp, char *assertion,
43                            const char *function, char *file, unsigned int line)
44 {
45         int me;
46         me = gfs2_lm_withdraw(sdp,
47                 "GFS2: fsid=%s: fatal: assertion \"%s\" failed\n"
48                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
49                 sdp->sd_fsname, assertion,
50                 sdp->sd_fsname, function, file, line);
51         dump_stack();
52         return (me) ? -1 : -2;
53 }
54
55 /**
56  * gfs2_assert_warn_i - Print a message to the console if @assertion is false
57  * Returns: -1 if we printed something
58  *          -2 if we didn't
59  */
60
61 int gfs2_assert_warn_i(struct gfs2_sbd *sdp, char *assertion,
62                        const char *function, char *file, unsigned int line)
63 {
64         if (time_before(jiffies,
65                         sdp->sd_last_warning +
66                         gfs2_tune_get(sdp, gt_complain_secs) * HZ))
67                 return -2;
68
69         printk(KERN_WARNING
70                "GFS2: fsid=%s: warning: assertion \"%s\" failed\n"
71                "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
72                sdp->sd_fsname, assertion,
73                sdp->sd_fsname, function, file, line);
74
75         if (sdp->sd_args.ar_debug)
76                 BUG();
77         else
78                 dump_stack();
79
80         sdp->sd_last_warning = jiffies;
81
82         return -1;
83 }
84
85 /**
86  * gfs2_consist_i - Flag a filesystem consistency error and withdraw
87  * Returns: -1 if this call withdrew the machine,
88  *          0 if it was already withdrawn
89  */
90
91 int gfs2_consist_i(struct gfs2_sbd *sdp, int cluster_wide, const char *function,
92                    char *file, unsigned int line)
93 {
94         int rv;
95         rv = gfs2_lm_withdraw(sdp,
96                 "GFS2: fsid=%s: fatal: filesystem consistency error\n"
97                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
98                 sdp->sd_fsname,
99                 sdp->sd_fsname, function, file, line);
100         return rv;
101 }
102
103 /**
104  * gfs2_consist_inode_i - Flag an inode consistency error and withdraw
105  * Returns: -1 if this call withdrew the machine,
106  *          0 if it was already withdrawn
107  */
108
109 int gfs2_consist_inode_i(struct gfs2_inode *ip, int cluster_wide,
110                          const char *function, char *file, unsigned int line)
111 {
112         struct gfs2_sbd *sdp = ip->i_sbd;
113         int rv;
114         rv = gfs2_lm_withdraw(sdp,
115                 "GFS2: fsid=%s: fatal: filesystem consistency error\n"
116                 "GFS2: fsid=%s:   inode = %llu %llu\n"
117                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
118                 sdp->sd_fsname,
119                 sdp->sd_fsname, ip->i_num.no_formal_ino, ip->i_num.no_addr,
120                 sdp->sd_fsname, function, file, line);
121         return rv;
122 }
123
124 /**
125  * gfs2_consist_rgrpd_i - Flag a RG consistency error and withdraw
126  * Returns: -1 if this call withdrew the machine,
127  *          0 if it was already withdrawn
128  */
129
130 int gfs2_consist_rgrpd_i(struct gfs2_rgrpd *rgd, int cluster_wide,
131                          const char *function, char *file, unsigned int line)
132 {
133         struct gfs2_sbd *sdp = rgd->rd_sbd;
134         int rv;
135         rv = gfs2_lm_withdraw(sdp,
136                 "GFS2: fsid=%s: fatal: filesystem consistency error\n"
137                 "GFS2: fsid=%s:   RG = %llu\n"
138                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
139                 sdp->sd_fsname,
140                 sdp->sd_fsname, rgd->rd_ri.ri_addr,
141                 sdp->sd_fsname, function, file, line);
142         return rv;
143 }
144
145 /**
146  * gfs2_meta_check_ii - Flag a magic number consistency error and withdraw
147  * Returns: -1 if this call withdrew the machine,
148  *          -2 if it was already withdrawn
149  */
150
151 int gfs2_meta_check_ii(struct gfs2_sbd *sdp, struct buffer_head *bh,
152                        const char *type, const char *function, char *file,
153                        unsigned int line)
154 {
155         int me;
156         me = gfs2_lm_withdraw(sdp,
157                 "GFS2: fsid=%s: fatal: invalid metadata block\n"
158                 "GFS2: fsid=%s:   bh = %llu (%s)\n"
159                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
160                 sdp->sd_fsname,
161                 sdp->sd_fsname, (uint64_t)bh->b_blocknr, type,
162                 sdp->sd_fsname, function, file, line);
163         return (me) ? -1 : -2;
164 }
165
166 /**
167  * gfs2_metatype_check_ii - Flag a metadata type consistency error and withdraw
168  * Returns: -1 if this call withdrew the machine,
169  *          -2 if it was already withdrawn
170  */
171
172 int gfs2_metatype_check_ii(struct gfs2_sbd *sdp, struct buffer_head *bh,
173                            uint16_t type, uint16_t t, const char *function,
174                            char *file, unsigned int line)
175 {
176         int me;
177         me = gfs2_lm_withdraw(sdp,
178                 "GFS2: fsid=%s: fatal: invalid metadata block\n"
179                 "GFS2: fsid=%s:   bh = %llu (type: exp=%u, found=%u)\n"
180                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
181                 sdp->sd_fsname,
182                 sdp->sd_fsname, (uint64_t)bh->b_blocknr, type, t,
183                 sdp->sd_fsname, function, file, line);
184         return (me) ? -1 : -2;
185 }
186
187 /**
188  * gfs2_io_error_i - Flag an I/O error and withdraw
189  * Returns: -1 if this call withdrew the machine,
190  *          0 if it was already withdrawn
191  */
192
193 int gfs2_io_error_i(struct gfs2_sbd *sdp, const char *function, char *file,
194                     unsigned int line)
195 {
196         int rv;
197         rv = gfs2_lm_withdraw(sdp,
198                 "GFS2: fsid=%s: fatal: I/O error\n"
199                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
200                 sdp->sd_fsname,
201                 sdp->sd_fsname, function, file, line);
202         return rv;
203 }
204
205 /**
206  * gfs2_io_error_bh_i - Flag a buffer I/O error and withdraw
207  * Returns: -1 if this call withdrew the machine,
208  *          0 if it was already withdrawn
209  */
210
211 int gfs2_io_error_bh_i(struct gfs2_sbd *sdp, struct buffer_head *bh,
212                        const char *function, char *file, unsigned int line)
213 {
214         int rv;
215         rv = gfs2_lm_withdraw(sdp,
216                 "GFS2: fsid=%s: fatal: I/O error\n"
217                 "GFS2: fsid=%s:   block = %llu\n"
218                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
219                 sdp->sd_fsname,
220                 sdp->sd_fsname, (uint64_t)bh->b_blocknr,
221                 sdp->sd_fsname, function, file, line);
222         return rv;
223 }
224
225 void gfs2_icbit_munge(struct gfs2_sbd *sdp, unsigned char **bitmap,
226                       unsigned int bit, int new_value)
227 {
228         unsigned int c, o, b = bit;
229         int old_value;
230
231         c = b / (8 * PAGE_SIZE);
232         b %= 8 * PAGE_SIZE;
233         o = b / 8;
234         b %= 8;
235
236         old_value = (bitmap[c][o] & (1 << b));
237         gfs2_assert_withdraw(sdp, !old_value != !new_value);
238
239         if (new_value)
240                 bitmap[c][o] |= 1 << b;
241         else
242                 bitmap[c][o] &= ~(1 << b);
243 }
244