xref: /openbmc/linux/fs/gfs2/util.c (revision 22246614)
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/slab.h>
11 #include <linux/spinlock.h>
12 #include <linux/completion.h>
13 #include <linux/buffer_head.h>
14 #include <linux/crc32.h>
15 #include <linux/gfs2_ondisk.h>
16 #include <linux/lm_interface.h>
17 #include <asm/uaccess.h>
18 
19 #include "gfs2.h"
20 #include "incore.h"
21 #include "glock.h"
22 #include "util.h"
23 
24 struct kmem_cache *gfs2_glock_cachep __read_mostly;
25 struct kmem_cache *gfs2_inode_cachep __read_mostly;
26 struct kmem_cache *gfs2_bufdata_cachep __read_mostly;
27 struct kmem_cache *gfs2_rgrpd_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 	va_list args;
38 
39 	if (test_and_set_bit(SDF_SHUTDOWN, &sdp->sd_flags))
40 		return 0;
41 
42 	va_start(args, fmt);
43 	vprintk(fmt, args);
44 	va_end(args);
45 
46 	fs_err(sdp, "about to withdraw this file system\n");
47 	BUG_ON(sdp->sd_args.ar_debug);
48 
49 	fs_err(sdp, "telling LM to withdraw\n");
50 	gfs2_withdraw_lockproto(&sdp->sd_lockstruct);
51 	fs_err(sdp, "withdrawn\n");
52 	dump_stack();
53 
54 	return -1;
55 }
56 
57 /**
58  * gfs2_assert_withdraw_i - Cause the machine to withdraw if @assertion is false
59  * Returns: -1 if this call withdrew the machine,
60  *          -2 if it was already withdrawn
61  */
62 
63 int gfs2_assert_withdraw_i(struct gfs2_sbd *sdp, char *assertion,
64 			   const char *function, char *file, unsigned int line)
65 {
66 	int me;
67 	me = gfs2_lm_withdraw(sdp,
68 		"GFS2: fsid=%s: fatal: assertion \"%s\" failed\n"
69 		"GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
70 		sdp->sd_fsname, assertion,
71 		sdp->sd_fsname, function, file, line);
72 	dump_stack();
73 	return (me) ? -1 : -2;
74 }
75 
76 /**
77  * gfs2_assert_warn_i - Print a message to the console if @assertion is false
78  * Returns: -1 if we printed something
79  *          -2 if we didn't
80  */
81 
82 int gfs2_assert_warn_i(struct gfs2_sbd *sdp, char *assertion,
83 		       const char *function, char *file, unsigned int line)
84 {
85 	if (time_before(jiffies,
86 			sdp->sd_last_warning +
87 			gfs2_tune_get(sdp, gt_complain_secs) * HZ))
88 		return -2;
89 
90 	printk(KERN_WARNING
91 	       "GFS2: fsid=%s: warning: assertion \"%s\" failed\n"
92 	       "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
93 	       sdp->sd_fsname, assertion,
94 	       sdp->sd_fsname, function, file, line);
95 
96 	if (sdp->sd_args.ar_debug)
97 		BUG();
98 	else
99 		dump_stack();
100 
101 	sdp->sd_last_warning = jiffies;
102 
103 	return -1;
104 }
105 
106 /**
107  * gfs2_consist_i - Flag a filesystem consistency error and withdraw
108  * Returns: -1 if this call withdrew the machine,
109  *          0 if it was already withdrawn
110  */
111 
112 int gfs2_consist_i(struct gfs2_sbd *sdp, int cluster_wide, const char *function,
113 		   char *file, unsigned int line)
114 {
115 	int rv;
116 	rv = gfs2_lm_withdraw(sdp,
117 		"GFS2: fsid=%s: fatal: filesystem consistency error\n"
118 		"GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
119 		sdp->sd_fsname,
120 		sdp->sd_fsname, function, file, line);
121 	return rv;
122 }
123 
124 /**
125  * gfs2_consist_inode_i - Flag an inode 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_inode_i(struct gfs2_inode *ip, int cluster_wide,
131 			 const char *function, char *file, unsigned int line)
132 {
133 	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
134 	int rv;
135 	rv = gfs2_lm_withdraw(sdp,
136 		"GFS2: fsid=%s: fatal: filesystem consistency error\n"
137 		"GFS2: fsid=%s:   inode = %llu %llu\n"
138 		"GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
139 		sdp->sd_fsname,
140 		sdp->sd_fsname, (unsigned long long)ip->i_no_formal_ino,
141 		(unsigned long long)ip->i_no_addr,
142 		sdp->sd_fsname, function, file, line);
143 	return rv;
144 }
145 
146 /**
147  * gfs2_consist_rgrpd_i - Flag a RG consistency error and withdraw
148  * Returns: -1 if this call withdrew the machine,
149  *          0 if it was already withdrawn
150  */
151 
152 int gfs2_consist_rgrpd_i(struct gfs2_rgrpd *rgd, int cluster_wide,
153 			 const char *function, char *file, unsigned int line)
154 {
155 	struct gfs2_sbd *sdp = rgd->rd_sbd;
156 	int rv;
157 	rv = gfs2_lm_withdraw(sdp,
158 		"GFS2: fsid=%s: fatal: filesystem consistency error\n"
159 		"GFS2: fsid=%s:   RG = %llu\n"
160 		"GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
161 		sdp->sd_fsname,
162 		sdp->sd_fsname, (unsigned long long)rgd->rd_addr,
163 		sdp->sd_fsname, function, file, line);
164 	return rv;
165 }
166 
167 /**
168  * gfs2_meta_check_ii - Flag a magic number consistency error and withdraw
169  * Returns: -1 if this call withdrew the machine,
170  *          -2 if it was already withdrawn
171  */
172 
173 int gfs2_meta_check_ii(struct gfs2_sbd *sdp, struct buffer_head *bh,
174 		       const char *type, const char *function, char *file,
175 		       unsigned int line)
176 {
177 	int me;
178 	me = gfs2_lm_withdraw(sdp,
179 		"GFS2: fsid=%s: fatal: invalid metadata block\n"
180 		"GFS2: fsid=%s:   bh = %llu (%s)\n"
181 		"GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
182 		sdp->sd_fsname,
183 		sdp->sd_fsname, (unsigned long long)bh->b_blocknr, type,
184 		sdp->sd_fsname, function, file, line);
185 	return (me) ? -1 : -2;
186 }
187 
188 /**
189  * gfs2_metatype_check_ii - Flag a metadata type consistency error and withdraw
190  * Returns: -1 if this call withdrew the machine,
191  *          -2 if it was already withdrawn
192  */
193 
194 int gfs2_metatype_check_ii(struct gfs2_sbd *sdp, struct buffer_head *bh,
195 			   u16 type, u16 t, const char *function,
196 			   char *file, unsigned int line)
197 {
198 	int me;
199 	me = gfs2_lm_withdraw(sdp,
200 		"GFS2: fsid=%s: fatal: invalid metadata block\n"
201 		"GFS2: fsid=%s:   bh = %llu (type: exp=%u, found=%u)\n"
202 		"GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
203 		sdp->sd_fsname,
204 		sdp->sd_fsname, (unsigned long long)bh->b_blocknr, type, t,
205 		sdp->sd_fsname, function, file, line);
206 	return (me) ? -1 : -2;
207 }
208 
209 /**
210  * gfs2_io_error_i - Flag an I/O error and withdraw
211  * Returns: -1 if this call withdrew the machine,
212  *          0 if it was already withdrawn
213  */
214 
215 int gfs2_io_error_i(struct gfs2_sbd *sdp, const char *function, char *file,
216 		    unsigned int line)
217 {
218 	int rv;
219 	rv = gfs2_lm_withdraw(sdp,
220 		"GFS2: fsid=%s: fatal: I/O error\n"
221 		"GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
222 		sdp->sd_fsname,
223 		sdp->sd_fsname, function, file, line);
224 	return rv;
225 }
226 
227 /**
228  * gfs2_io_error_bh_i - Flag a buffer I/O error and withdraw
229  * Returns: -1 if this call withdrew the machine,
230  *          0 if it was already withdrawn
231  */
232 
233 int gfs2_io_error_bh_i(struct gfs2_sbd *sdp, struct buffer_head *bh,
234 		       const char *function, char *file, unsigned int line)
235 {
236 	int rv;
237 	rv = gfs2_lm_withdraw(sdp,
238 		"GFS2: fsid=%s: fatal: I/O error\n"
239 		"GFS2: fsid=%s:   block = %llu\n"
240 		"GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
241 		sdp->sd_fsname,
242 		sdp->sd_fsname, (unsigned long long)bh->b_blocknr,
243 		sdp->sd_fsname, function, file, line);
244 	return rv;
245 }
246 
247 void gfs2_icbit_munge(struct gfs2_sbd *sdp, unsigned char **bitmap,
248 		      unsigned int bit, int new_value)
249 {
250 	unsigned int c, o, b = bit;
251 	int old_value;
252 
253 	c = b / (8 * PAGE_SIZE);
254 	b %= 8 * PAGE_SIZE;
255 	o = b / 8;
256 	b %= 8;
257 
258 	old_value = (bitmap[c][o] & (1 << b));
259 	gfs2_assert_withdraw(sdp, !old_value != !new_value);
260 
261 	if (new_value)
262 		bitmap[c][o] |= 1 << b;
263 	else
264 		bitmap[c][o] &= ~(1 << b);
265 }
266 
267