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Linux/fs/gfs2/util.c

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  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 struct kmem_cache *gfs2_rsrv_cachep __read_mostly;
 29 mempool_t *gfs2_page_pool __read_mostly;
 30 
 31 void gfs2_assert_i(struct gfs2_sbd *sdp)
 32 {
 33         printk(KERN_EMERG "GFS2: fsid=%s: fatal assertion failed\n",
 34                sdp->sd_fsname);
 35 }
 36 
 37 int gfs2_lm_withdraw(struct gfs2_sbd *sdp, char *fmt, ...)
 38 {
 39         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 40         const struct lm_lockops *lm = ls->ls_ops;
 41         va_list args;
 42 
 43         if (sdp->sd_args.ar_errors == GFS2_ERRORS_WITHDRAW &&
 44             test_and_set_bit(SDF_SHUTDOWN, &sdp->sd_flags))
 45                 return 0;
 46 
 47         va_start(args, fmt);
 48         vprintk(fmt, args);
 49         va_end(args);
 50 
 51         if (sdp->sd_args.ar_errors == GFS2_ERRORS_WITHDRAW) {
 52                 fs_err(sdp, "about to withdraw this file system\n");
 53                 BUG_ON(sdp->sd_args.ar_debug);
 54 
 55                 kobject_uevent(&sdp->sd_kobj, KOBJ_OFFLINE);
 56 
 57                 if (!strcmp(sdp->sd_lockstruct.ls_ops->lm_proto_name, "lock_dlm"))
 58                         wait_for_completion(&sdp->sd_wdack);
 59 
 60                 if (lm->lm_unmount) {
 61                         fs_err(sdp, "telling LM to unmount\n");
 62                         lm->lm_unmount(sdp);
 63                 }
 64                 fs_err(sdp, "withdrawn\n");
 65                 dump_stack();
 66         }
 67 
 68         if (sdp->sd_args.ar_errors == GFS2_ERRORS_PANIC)
 69                 panic("GFS2: fsid=%s: panic requested.\n", sdp->sd_fsname);
 70 
 71         return -1;
 72 }
 73 
 74 /**
 75  * gfs2_assert_withdraw_i - Cause the machine to withdraw if @assertion is false
 76  * Returns: -1 if this call withdrew the machine,
 77  *          -2 if it was already withdrawn
 78  */
 79 
 80 int gfs2_assert_withdraw_i(struct gfs2_sbd *sdp, char *assertion,
 81                            const char *function, char *file, unsigned int line)
 82 {
 83         int me;
 84         me = gfs2_lm_withdraw(sdp,
 85                 "GFS2: fsid=%s: fatal: assertion \"%s\" failed\n"
 86                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
 87                 sdp->sd_fsname, assertion,
 88                 sdp->sd_fsname, function, file, line);
 89         dump_stack();
 90         return (me) ? -1 : -2;
 91 }
 92 
 93 /**
 94  * gfs2_assert_warn_i - Print a message to the console if @assertion is false
 95  * Returns: -1 if we printed something
 96  *          -2 if we didn't
 97  */
 98 
 99 int gfs2_assert_warn_i(struct gfs2_sbd *sdp, char *assertion,
100                        const char *function, char *file, unsigned int line)
101 {
102         if (time_before(jiffies,
103                         sdp->sd_last_warning +
104                         gfs2_tune_get(sdp, gt_complain_secs) * HZ))
105                 return -2;
106 
107         if (sdp->sd_args.ar_errors == GFS2_ERRORS_WITHDRAW)
108                 printk(KERN_WARNING
109                        "GFS2: fsid=%s: warning: assertion \"%s\" failed\n"
110                        "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
111                        sdp->sd_fsname, assertion,
112                        sdp->sd_fsname, function, file, line);
113 
114         if (sdp->sd_args.ar_debug)
115                 BUG();
116         else
117                 dump_stack();
118 
119         if (sdp->sd_args.ar_errors == GFS2_ERRORS_PANIC)
120                 panic("GFS2: fsid=%s: warning: assertion \"%s\" failed\n"
121                       "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
122                       sdp->sd_fsname, assertion,
123                       sdp->sd_fsname, function, file, line);
124 
125         sdp->sd_last_warning = jiffies;
126 
127         return -1;
128 }
129 
130 /**
131  * gfs2_consist_i - Flag a filesystem consistency error and withdraw
132  * Returns: -1 if this call withdrew the machine,
133  *          0 if it was already withdrawn
134  */
135 
136 int gfs2_consist_i(struct gfs2_sbd *sdp, int cluster_wide, const char *function,
137                    char *file, unsigned int line)
138 {
139         int rv;
140         rv = gfs2_lm_withdraw(sdp,
141                 "GFS2: fsid=%s: fatal: filesystem consistency error\n"
142                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
143                 sdp->sd_fsname,
144                 sdp->sd_fsname, function, file, line);
145         return rv;
146 }
147 
148 /**
149  * gfs2_consist_inode_i - Flag an inode consistency error and withdraw
150  * Returns: -1 if this call withdrew the machine,
151  *          0 if it was already withdrawn
152  */
153 
154 int gfs2_consist_inode_i(struct gfs2_inode *ip, int cluster_wide,
155                          const char *function, char *file, unsigned int line)
156 {
157         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
158         int rv;
159         rv = gfs2_lm_withdraw(sdp,
160                 "GFS2: fsid=%s: fatal: filesystem consistency error\n"
161                 "GFS2: fsid=%s:   inode = %llu %llu\n"
162                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
163                 sdp->sd_fsname,
164                 sdp->sd_fsname, (unsigned long long)ip->i_no_formal_ino,
165                 (unsigned long long)ip->i_no_addr,
166                 sdp->sd_fsname, function, file, line);
167         return rv;
168 }
169 
170 /**
171  * gfs2_consist_rgrpd_i - Flag a RG consistency error and withdraw
172  * Returns: -1 if this call withdrew the machine,
173  *          0 if it was already withdrawn
174  */
175 
176 int gfs2_consist_rgrpd_i(struct gfs2_rgrpd *rgd, int cluster_wide,
177                          const char *function, char *file, unsigned int line)
178 {
179         struct gfs2_sbd *sdp = rgd->rd_sbd;
180         int rv;
181         rv = gfs2_lm_withdraw(sdp,
182                 "GFS2: fsid=%s: fatal: filesystem consistency error\n"
183                 "GFS2: fsid=%s:   RG = %llu\n"
184                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
185                 sdp->sd_fsname,
186                 sdp->sd_fsname, (unsigned long long)rgd->rd_addr,
187                 sdp->sd_fsname, function, file, line);
188         return rv;
189 }
190 
191 /**
192  * gfs2_meta_check_ii - Flag a magic number consistency error and withdraw
193  * Returns: -1 if this call withdrew the machine,
194  *          -2 if it was already withdrawn
195  */
196 
197 int gfs2_meta_check_ii(struct gfs2_sbd *sdp, struct buffer_head *bh,
198                        const char *type, const char *function, char *file,
199                        unsigned int line)
200 {
201         int me;
202         me = gfs2_lm_withdraw(sdp,
203                 "GFS2: fsid=%s: fatal: invalid metadata block\n"
204                 "GFS2: fsid=%s:   bh = %llu (%s)\n"
205                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
206                 sdp->sd_fsname,
207                 sdp->sd_fsname, (unsigned long long)bh->b_blocknr, type,
208                 sdp->sd_fsname, function, file, line);
209         return (me) ? -1 : -2;
210 }
211 
212 /**
213  * gfs2_metatype_check_ii - Flag a metadata type consistency error and withdraw
214  * Returns: -1 if this call withdrew the machine,
215  *          -2 if it was already withdrawn
216  */
217 
218 int gfs2_metatype_check_ii(struct gfs2_sbd *sdp, struct buffer_head *bh,
219                            u16 type, u16 t, const char *function,
220                            char *file, unsigned int line)
221 {
222         int me;
223         me = gfs2_lm_withdraw(sdp,
224                 "GFS2: fsid=%s: fatal: invalid metadata block\n"
225                 "GFS2: fsid=%s:   bh = %llu (type: exp=%u, found=%u)\n"
226                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
227                 sdp->sd_fsname,
228                 sdp->sd_fsname, (unsigned long long)bh->b_blocknr, type, t,
229                 sdp->sd_fsname, function, file, line);
230         return (me) ? -1 : -2;
231 }
232 
233 /**
234  * gfs2_io_error_i - Flag an I/O error and withdraw
235  * Returns: -1 if this call withdrew the machine,
236  *          0 if it was already withdrawn
237  */
238 
239 int gfs2_io_error_i(struct gfs2_sbd *sdp, const char *function, char *file,
240                     unsigned int line)
241 {
242         int rv;
243         rv = gfs2_lm_withdraw(sdp,
244                 "GFS2: fsid=%s: fatal: I/O error\n"
245                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
246                 sdp->sd_fsname,
247                 sdp->sd_fsname, function, file, line);
248         return rv;
249 }
250 
251 /**
252  * gfs2_io_error_bh_i - Flag a buffer I/O error and withdraw
253  * Returns: -1 if this call withdrew the machine,
254  *          0 if it was already withdrawn
255  */
256 
257 int gfs2_io_error_bh_i(struct gfs2_sbd *sdp, struct buffer_head *bh,
258                        const char *function, char *file, unsigned int line)
259 {
260         int rv;
261         rv = gfs2_lm_withdraw(sdp,
262                 "GFS2: fsid=%s: fatal: I/O error\n"
263                 "GFS2: fsid=%s:   block = %llu\n"
264                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
265                 sdp->sd_fsname,
266                 sdp->sd_fsname, (unsigned long long)bh->b_blocknr,
267                 sdp->sd_fsname, function, file, line);
268         return rv;
269 }
270 
271 void gfs2_icbit_munge(struct gfs2_sbd *sdp, unsigned char **bitmap,
272                       unsigned int bit, int new_value)
273 {
274         unsigned int c, o, b = bit;
275         int old_value;
276 
277         c = b / (8 * PAGE_SIZE);
278         b %= 8 * PAGE_SIZE;
279         o = b / 8;
280         b %= 8;
281 
282         old_value = (bitmap[c][o] & (1 << b));
283         gfs2_assert_withdraw(sdp, !old_value != !new_value);
284 
285         if (new_value)
286                 bitmap[c][o] |= 1 << b;
287         else
288                 bitmap[c][o] &= ~(1 << b);
289 }
290 
291 

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