1 // SPDX-License-Identifier: GPL-2.0-only <<
2 /* 1 /*
3 * Persistent Storage - ramfs parts. 2 * Persistent Storage - ramfs parts.
4 * 3 *
5 * Copyright (C) 2010 Intel Corporation <tony. 4 * Copyright (C) 2010 Intel Corporation <tony.luck@intel.com>
>> 5 *
>> 6 * This program is free software; you can redistribute it and/or modify
>> 7 * it under the terms of the GNU General Public License version 2 as
>> 8 * published by the Free Software Foundation.
>> 9 *
>> 10 * This program is distributed in the hope that it will be useful,
>> 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
>> 13 * GNU General Public License for more details.
>> 14 *
>> 15 * You should have received a copy of the GNU General Public License
>> 16 * along with this program; if not, write to the Free Software
>> 17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
6 */ 18 */
7 19
8 #include <linux/module.h> 20 #include <linux/module.h>
9 #include <linux/fs.h> 21 #include <linux/fs.h>
10 #include <linux/fsnotify.h> 22 #include <linux/fsnotify.h>
11 #include <linux/pagemap.h> 23 #include <linux/pagemap.h>
12 #include <linux/highmem.h> 24 #include <linux/highmem.h>
13 #include <linux/time.h> 25 #include <linux/time.h>
14 #include <linux/init.h> 26 #include <linux/init.h>
15 #include <linux/list.h> 27 #include <linux/list.h>
16 #include <linux/string.h> 28 #include <linux/string.h>
17 #include <linux/mount.h> 29 #include <linux/mount.h>
18 #include <linux/seq_file.h> 30 #include <linux/seq_file.h>
19 #include <linux/ramfs.h> 31 #include <linux/ramfs.h>
20 #include <linux/parser.h> 32 #include <linux/parser.h>
21 #include <linux/sched.h> 33 #include <linux/sched.h>
22 #include <linux/magic.h> 34 #include <linux/magic.h>
23 #include <linux/pstore.h> 35 #include <linux/pstore.h>
24 #include <linux/slab.h> 36 #include <linux/slab.h>
>> 37 #include <linux/spinlock.h>
25 #include <linux/uaccess.h> 38 #include <linux/uaccess.h>
26 #include <linux/cleanup.h> !! 39 #include <linux/syslog.h>
27 40
28 #include "internal.h" 41 #include "internal.h"
29 42
30 #define PSTORE_NAMELEN 64 43 #define PSTORE_NAMELEN 64
31 44
32 static DEFINE_MUTEX(records_list_lock); !! 45 static DEFINE_SPINLOCK(allpstore_lock);
33 static LIST_HEAD(records_list); !! 46 static LIST_HEAD(allpstore);
34 <<
35 static DEFINE_MUTEX(pstore_sb_lock); <<
36 static struct super_block *pstore_sb; <<
37 <<
38 DEFINE_FREE(pstore_iput, struct inode *, if (_ <<
39 47
40 struct pstore_private { 48 struct pstore_private {
41 struct list_head list; 49 struct list_head list;
42 struct dentry *dentry; !! 50 struct pstore_info *psi;
43 struct pstore_record *record; !! 51 enum pstore_type_id type;
44 size_t total_size; !! 52 u64 id;
>> 53 int count;
>> 54 ssize_t size;
>> 55 char data[];
45 }; 56 };
46 57
47 struct pstore_ftrace_seq_data { 58 struct pstore_ftrace_seq_data {
48 const void *ptr; 59 const void *ptr;
49 size_t off; 60 size_t off;
50 size_t size; 61 size_t size;
51 }; 62 };
52 63
53 #define REC_SIZE sizeof(struct pstore_ftrace_r 64 #define REC_SIZE sizeof(struct pstore_ftrace_record)
54 65
55 static void free_pstore_private(struct pstore_ <<
56 { <<
57 if (!private) <<
58 return; <<
59 if (private->record) { <<
60 kvfree(private->record->buf); <<
61 kfree(private->record->priv); <<
62 kfree(private->record); <<
63 } <<
64 kfree(private); <<
65 } <<
66 DEFINE_FREE(pstore_private, struct pstore_priv <<
67 <<
68 static void *pstore_ftrace_seq_start(struct se 66 static void *pstore_ftrace_seq_start(struct seq_file *s, loff_t *pos)
69 { 67 {
70 struct pstore_private *ps = s->private 68 struct pstore_private *ps = s->private;
71 struct pstore_ftrace_seq_data *data __ !! 69 struct pstore_ftrace_seq_data *data;
72 70
73 data = kzalloc(sizeof(*data), GFP_KERN 71 data = kzalloc(sizeof(*data), GFP_KERNEL);
74 if (!data) 72 if (!data)
75 return NULL; 73 return NULL;
76 74
77 data->off = ps->total_size % REC_SIZE; !! 75 data->off = ps->size % REC_SIZE;
78 data->off += *pos * REC_SIZE; 76 data->off += *pos * REC_SIZE;
79 if (data->off + REC_SIZE > ps->total_s !! 77 if (data->off + REC_SIZE > ps->size) {
>> 78 kfree(data);
80 return NULL; 79 return NULL;
>> 80 }
>> 81
>> 82 return data;
81 83
82 return_ptr(data); <<
83 } 84 }
84 85
85 static void pstore_ftrace_seq_stop(struct seq_ 86 static void pstore_ftrace_seq_stop(struct seq_file *s, void *v)
86 { 87 {
87 kfree(v); 88 kfree(v);
88 } 89 }
89 90
90 static void *pstore_ftrace_seq_next(struct seq 91 static void *pstore_ftrace_seq_next(struct seq_file *s, void *v, loff_t *pos)
91 { 92 {
92 struct pstore_private *ps = s->private 93 struct pstore_private *ps = s->private;
93 struct pstore_ftrace_seq_data *data = 94 struct pstore_ftrace_seq_data *data = v;
94 95
95 (*pos)++; <<
96 data->off += REC_SIZE; 96 data->off += REC_SIZE;
97 if (data->off + REC_SIZE > ps->total_s !! 97 if (data->off + REC_SIZE > ps->size)
98 return NULL; 98 return NULL;
99 99
>> 100 (*pos)++;
100 return data; 101 return data;
101 } 102 }
102 103
103 static int pstore_ftrace_seq_show(struct seq_f 104 static int pstore_ftrace_seq_show(struct seq_file *s, void *v)
104 { 105 {
105 struct pstore_private *ps = s->private 106 struct pstore_private *ps = s->private;
106 struct pstore_ftrace_seq_data *data = 107 struct pstore_ftrace_seq_data *data = v;
107 struct pstore_ftrace_record *rec; !! 108 struct pstore_ftrace_record *rec = (void *)(ps->data + data->off);
108 109
109 if (!data) !! 110 seq_printf(s, "CPU:%d ts:%llu %08lx %08lx %pf <- %pF\n",
110 return 0; <<
111 <<
112 rec = (struct pstore_ftrace_record *)( <<
113 <<
114 seq_printf(s, "CPU:%d ts:%llu %08lx % <<
115 pstore_ftrace_decode_cpu(re 111 pstore_ftrace_decode_cpu(rec),
116 pstore_ftrace_read_timestam 112 pstore_ftrace_read_timestamp(rec),
117 rec->ip, rec->parent_ip, (v 113 rec->ip, rec->parent_ip, (void *)rec->ip,
118 (void *)rec->parent_ip); 114 (void *)rec->parent_ip);
119 115
120 return 0; 116 return 0;
121 } 117 }
122 118
123 static const struct seq_operations pstore_ftra 119 static const struct seq_operations pstore_ftrace_seq_ops = {
124 .start = pstore_ftrace_seq_start, 120 .start = pstore_ftrace_seq_start,
125 .next = pstore_ftrace_seq_next, 121 .next = pstore_ftrace_seq_next,
126 .stop = pstore_ftrace_seq_stop, 122 .stop = pstore_ftrace_seq_stop,
127 .show = pstore_ftrace_seq_show, 123 .show = pstore_ftrace_seq_show,
128 }; 124 };
129 125
>> 126 static int pstore_check_syslog_permissions(struct pstore_private *ps)
>> 127 {
>> 128 switch (ps->type) {
>> 129 case PSTORE_TYPE_DMESG:
>> 130 case PSTORE_TYPE_CONSOLE:
>> 131 return check_syslog_permissions(SYSLOG_ACTION_READ_ALL,
>> 132 SYSLOG_FROM_READER);
>> 133 default:
>> 134 return 0;
>> 135 }
>> 136 }
>> 137
130 static ssize_t pstore_file_read(struct file *f 138 static ssize_t pstore_file_read(struct file *file, char __user *userbuf,
131 139 size_t count, loff_t *ppos)
132 { 140 {
133 struct seq_file *sf = file->private_da 141 struct seq_file *sf = file->private_data;
134 struct pstore_private *ps = sf->privat 142 struct pstore_private *ps = sf->private;
135 143
136 if (ps->record->type == PSTORE_TYPE_FT !! 144 if (ps->type == PSTORE_TYPE_FTRACE)
137 return seq_read(file, userbuf, 145 return seq_read(file, userbuf, count, ppos);
138 return simple_read_from_buffer(userbuf !! 146 return simple_read_from_buffer(userbuf, count, ppos, ps->data, ps->size);
139 ps->rec <<
140 } 147 }
141 148
142 static int pstore_file_open(struct inode *inod 149 static int pstore_file_open(struct inode *inode, struct file *file)
143 { 150 {
144 struct pstore_private *ps = inode->i_p 151 struct pstore_private *ps = inode->i_private;
145 struct seq_file *sf; 152 struct seq_file *sf;
146 int err; 153 int err;
147 const struct seq_operations *sops = NU 154 const struct seq_operations *sops = NULL;
148 155
149 if (ps->record->type == PSTORE_TYPE_FT !! 156 err = pstore_check_syslog_permissions(ps);
>> 157 if (err)
>> 158 return err;
>> 159
>> 160 if (ps->type == PSTORE_TYPE_FTRACE)
150 sops = &pstore_ftrace_seq_ops; 161 sops = &pstore_ftrace_seq_ops;
151 162
152 err = seq_open(file, sops); 163 err = seq_open(file, sops);
153 if (err < 0) 164 if (err < 0)
154 return err; 165 return err;
155 166
156 sf = file->private_data; 167 sf = file->private_data;
157 sf->private = ps; 168 sf->private = ps;
158 169
159 return 0; 170 return 0;
160 } 171 }
161 172
162 static loff_t pstore_file_llseek(struct file * 173 static loff_t pstore_file_llseek(struct file *file, loff_t off, int whence)
163 { 174 {
164 struct seq_file *sf = file->private_da 175 struct seq_file *sf = file->private_data;
165 176
166 if (sf->op) 177 if (sf->op)
167 return seq_lseek(file, off, wh 178 return seq_lseek(file, off, whence);
168 return default_llseek(file, off, whenc 179 return default_llseek(file, off, whence);
169 } 180 }
170 181
171 static const struct file_operations pstore_fil 182 static const struct file_operations pstore_file_operations = {
172 .open = pstore_file_open, 183 .open = pstore_file_open,
173 .read = pstore_file_read, 184 .read = pstore_file_read,
174 .llseek = pstore_file_llseek, 185 .llseek = pstore_file_llseek,
175 .release = seq_release, 186 .release = seq_release,
176 }; 187 };
177 188
178 /* 189 /*
179 * When a file is unlinked from our file syste 190 * When a file is unlinked from our file system we call the
180 * platform driver to erase the record from pe 191 * platform driver to erase the record from persistent store.
181 */ 192 */
182 static int pstore_unlink(struct inode *dir, st 193 static int pstore_unlink(struct inode *dir, struct dentry *dentry)
183 { 194 {
184 struct pstore_private *p = d_inode(den 195 struct pstore_private *p = d_inode(dentry)->i_private;
185 struct pstore_record *record = p->reco !! 196 int err;
186 197
187 if (!record->psi->erase) !! 198 err = pstore_check_syslog_permissions(p);
188 return -EPERM; !! 199 if (err)
>> 200 return err;
189 201
190 /* Make sure we can't race while remov !! 202 if (p->psi->erase) {
191 scoped_guard(mutex, &records_list_lock !! 203 mutex_lock(&p->psi->read_mutex);
192 if (!list_empty(&p->list)) !! 204 p->psi->erase(p->type, p->id, p->count,
193 list_del_init(&p->list !! 205 d_inode(dentry)->i_ctime, p->psi);
194 else !! 206 mutex_unlock(&p->psi->read_mutex);
195 return -ENOENT; !! 207 } else {
196 p->dentry = NULL; !! 208 return -EPERM;
197 } 209 }
198 210
199 scoped_guard(mutex, &record->psi->read <<
200 record->psi->erase(record); <<
201 <<
202 return simple_unlink(dir, dentry); 211 return simple_unlink(dir, dentry);
203 } 212 }
204 213
205 static void pstore_evict_inode(struct inode *i 214 static void pstore_evict_inode(struct inode *inode)
206 { 215 {
207 struct pstore_private *p = inode->i_ 216 struct pstore_private *p = inode->i_private;
>> 217 unsigned long flags;
208 218
209 clear_inode(inode); 219 clear_inode(inode);
210 free_pstore_private(p); !! 220 if (p) {
>> 221 spin_lock_irqsave(&allpstore_lock, flags);
>> 222 list_del(&p->list);
>> 223 spin_unlock_irqrestore(&allpstore_lock, flags);
>> 224 kfree(p);
>> 225 }
211 } 226 }
212 227
213 static const struct inode_operations pstore_di 228 static const struct inode_operations pstore_dir_inode_operations = {
214 .lookup = simple_lookup, 229 .lookup = simple_lookup,
215 .unlink = pstore_unlink, 230 .unlink = pstore_unlink,
216 }; 231 };
217 232
218 static struct inode *pstore_get_inode(struct s 233 static struct inode *pstore_get_inode(struct super_block *sb)
219 { 234 {
220 struct inode *inode = new_inode(sb); 235 struct inode *inode = new_inode(sb);
221 if (inode) { 236 if (inode) {
222 inode->i_ino = get_next_ino(); 237 inode->i_ino = get_next_ino();
223 simple_inode_init_ts(inode); !! 238 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
224 } 239 }
225 return inode; 240 return inode;
226 } 241 }
227 242
228 enum { 243 enum {
229 Opt_kmsg_bytes, Opt_err 244 Opt_kmsg_bytes, Opt_err
230 }; 245 };
231 246
232 static const match_table_t tokens = { 247 static const match_table_t tokens = {
233 {Opt_kmsg_bytes, "kmsg_bytes=%u"}, 248 {Opt_kmsg_bytes, "kmsg_bytes=%u"},
234 {Opt_err, NULL} 249 {Opt_err, NULL}
235 }; 250 };
236 251
237 static void parse_options(char *options) 252 static void parse_options(char *options)
238 { 253 {
239 char *p; 254 char *p;
240 substring_t args[MAX_OPT_ARGS]; 255 substring_t args[MAX_OPT_ARGS];
241 int option; 256 int option;
242 257
243 if (!options) 258 if (!options)
244 return; 259 return;
245 260
246 while ((p = strsep(&options, ",")) != 261 while ((p = strsep(&options, ",")) != NULL) {
247 int token; 262 int token;
248 263
249 if (!*p) 264 if (!*p)
250 continue; 265 continue;
251 266
252 token = match_token(p, tokens, 267 token = match_token(p, tokens, args);
253 switch (token) { 268 switch (token) {
254 case Opt_kmsg_bytes: 269 case Opt_kmsg_bytes:
255 if (!match_int(&args[0 270 if (!match_int(&args[0], &option))
256 pstore_set_kms 271 pstore_set_kmsg_bytes(option);
257 break; 272 break;
258 } 273 }
259 } 274 }
260 } 275 }
261 276
262 /* <<
263 * Display the mount options in /proc/mounts. <<
264 */ <<
265 static int pstore_show_options(struct seq_file <<
266 { <<
267 if (kmsg_bytes != CONFIG_PSTORE_DEFAUL <<
268 seq_printf(m, ",kmsg_bytes=%lu <<
269 return 0; <<
270 } <<
271 <<
272 static int pstore_remount(struct super_block * 277 static int pstore_remount(struct super_block *sb, int *flags, char *data)
273 { 278 {
274 sync_filesystem(sb); 279 sync_filesystem(sb);
275 parse_options(data); 280 parse_options(data);
276 281
277 return 0; 282 return 0;
278 } 283 }
279 284
280 static const struct super_operations pstore_op 285 static const struct super_operations pstore_ops = {
281 .statfs = simple_statfs, 286 .statfs = simple_statfs,
282 .drop_inode = generic_delete_inode 287 .drop_inode = generic_delete_inode,
283 .evict_inode = pstore_evict_inode, 288 .evict_inode = pstore_evict_inode,
284 .remount_fs = pstore_remount, 289 .remount_fs = pstore_remount,
285 .show_options = pstore_show_options, !! 290 .show_options = generic_show_options,
286 }; 291 };
287 292
288 static struct dentry *psinfo_lock_root(void) !! 293 static struct super_block *pstore_sb;
289 { <<
290 struct dentry *root; <<
291 <<
292 guard(mutex)(&pstore_sb_lock); <<
293 /* <<
294 * Having no backend is fine -- no rec <<
295 * Not being mounted is fine -- nothin <<
296 */ <<
297 if (!psinfo || !pstore_sb) <<
298 return NULL; <<
299 <<
300 root = pstore_sb->s_root; <<
301 inode_lock(d_inode(root)); <<
302 <<
303 return root; <<
304 } <<
305 294
306 int pstore_put_backend_records(struct pstore_i !! 295 bool pstore_is_mounted(void)
307 { 296 {
308 struct pstore_private *pos, *tmp; !! 297 return pstore_sb != NULL;
309 struct dentry *root; <<
310 <<
311 root = psinfo_lock_root(); <<
312 if (!root) <<
313 return 0; <<
314 <<
315 scoped_guard(mutex, &records_list_lock <<
316 list_for_each_entry_safe(pos, <<
317 if (pos->record->psi = <<
318 list_del_init( <<
319 d_invalidate(p <<
320 simple_unlink( <<
321 pos->dentry = <<
322 } <<
323 } <<
324 } <<
325 <<
326 inode_unlock(d_inode(root)); <<
327 <<
328 return 0; <<
329 } 298 }
330 299
331 /* 300 /*
332 * Make a regular file in the root directory o 301 * Make a regular file in the root directory of our file system.
333 * Load it up with "size" bytes of data from " 302 * Load it up with "size" bytes of data from "buf".
334 * Set the mtime & ctime to the date that this 303 * Set the mtime & ctime to the date that this record was originally stored.
335 */ 304 */
336 int pstore_mkfile(struct dentry *root, struct !! 305 int pstore_mkfile(enum pstore_type_id type, char *psname, u64 id, int count,
>> 306 char *data, bool compressed, size_t size,
>> 307 struct timespec time, struct pstore_info *psi)
337 { 308 {
>> 309 struct dentry *root = pstore_sb->s_root;
338 struct dentry *dentry; 310 struct dentry *dentry;
339 struct inode *inode __free( !! 311 struct inode *inode;
>> 312 int rc = 0;
340 char name[PSTORE_NA 313 char name[PSTORE_NAMELEN];
341 struct pstore_private *private __fre !! 314 struct pstore_private *private, *pos;
342 size_t size = record- !! 315 unsigned long flags;
343 <<
344 if (WARN_ON(!inode_is_locked(d_inode(r <<
345 return -EINVAL; <<
346 <<
347 guard(mutex)(&records_list_lock); <<
348 316
349 /* Skip records that are already prese !! 317 spin_lock_irqsave(&allpstore_lock, flags);
350 list_for_each_entry(pos, &records_list !! 318 list_for_each_entry(pos, &allpstore, list) {
351 if (pos->record->type == recor !! 319 if (pos->type == type &&
352 pos->record->id == record- !! 320 pos->id == id &&
353 pos->record->psi == record !! 321 pos->psi == psi) {
354 return -EEXIST; !! 322 rc = -EEXIST;
>> 323 break;
>> 324 }
355 } 325 }
>> 326 spin_unlock_irqrestore(&allpstore_lock, flags);
>> 327 if (rc)
>> 328 return rc;
356 329
357 inode = pstore_get_inode(root->d_sb); !! 330 rc = -ENOMEM;
>> 331 inode = pstore_get_inode(pstore_sb);
358 if (!inode) 332 if (!inode)
359 return -ENOMEM; !! 333 goto fail;
360 inode->i_mode = S_IFREG | 0444; 334 inode->i_mode = S_IFREG | 0444;
361 inode->i_fop = &pstore_file_operations 335 inode->i_fop = &pstore_file_operations;
362 scnprintf(name, sizeof(name), "%s-%s-% !! 336 private = kmalloc(sizeof *private + size, GFP_KERNEL);
363 pstore_type_to_name(re <<
364 record->psi->name, rec <<
365 record->compressed ? " <<
366 <<
367 private = kzalloc(sizeof(*private), GF <<
368 if (!private) 337 if (!private)
369 return -ENOMEM; !! 338 goto fail_alloc;
>> 339 private->type = type;
>> 340 private->id = id;
>> 341 private->count = count;
>> 342 private->psi = psi;
>> 343
>> 344 switch (type) {
>> 345 case PSTORE_TYPE_DMESG:
>> 346 scnprintf(name, sizeof(name), "dmesg-%s-%lld%s",
>> 347 psname, id, compressed ? ".enc.z" : "");
>> 348 break;
>> 349 case PSTORE_TYPE_CONSOLE:
>> 350 scnprintf(name, sizeof(name), "console-%s-%lld", psname, id);
>> 351 break;
>> 352 case PSTORE_TYPE_FTRACE:
>> 353 scnprintf(name, sizeof(name), "ftrace-%s-%lld", psname, id);
>> 354 break;
>> 355 case PSTORE_TYPE_MCE:
>> 356 scnprintf(name, sizeof(name), "mce-%s-%lld", psname, id);
>> 357 break;
>> 358 case PSTORE_TYPE_PPC_RTAS:
>> 359 scnprintf(name, sizeof(name), "rtas-%s-%lld", psname, id);
>> 360 break;
>> 361 case PSTORE_TYPE_PPC_OF:
>> 362 scnprintf(name, sizeof(name), "powerpc-ofw-%s-%lld",
>> 363 psname, id);
>> 364 break;
>> 365 case PSTORE_TYPE_PPC_COMMON:
>> 366 scnprintf(name, sizeof(name), "powerpc-common-%s-%lld",
>> 367 psname, id);
>> 368 break;
>> 369 case PSTORE_TYPE_PMSG:
>> 370 scnprintf(name, sizeof(name), "pmsg-%s-%lld", psname, id);
>> 371 break;
>> 372 case PSTORE_TYPE_PPC_OPAL:
>> 373 sprintf(name, "powerpc-opal-%s-%lld", psname, id);
>> 374 break;
>> 375 case PSTORE_TYPE_UNKNOWN:
>> 376 scnprintf(name, sizeof(name), "unknown-%s-%lld", psname, id);
>> 377 break;
>> 378 default:
>> 379 scnprintf(name, sizeof(name), "type%d-%s-%lld",
>> 380 type, psname, id);
>> 381 break;
>> 382 }
>> 383
>> 384 inode_lock(d_inode(root));
370 385
371 dentry = d_alloc_name(root, name); 386 dentry = d_alloc_name(root, name);
372 if (!dentry) 387 if (!dentry)
373 return -ENOMEM; !! 388 goto fail_lockedalloc;
>> 389
>> 390 memcpy(private->data, data, size);
>> 391 inode->i_size = private->size = size;
374 392
375 private->dentry = dentry; <<
376 private->record = record; <<
377 inode->i_size = private->total_size = <<
378 inode->i_private = private; 393 inode->i_private = private;
379 394
380 if (record->time.tv_sec) !! 395 if (time.tv_sec)
381 inode_set_mtime_to_ts(inode, !! 396 inode->i_mtime = inode->i_ctime = time;
382 inode_se <<
383 397
384 d_add(dentry, no_free_ptr(inode)); !! 398 d_add(dentry, inode);
385 399
386 list_add(&(no_free_ptr(private))->list !! 400 spin_lock_irqsave(&allpstore_lock, flags);
>> 401 list_add(&private->list, &allpstore);
>> 402 spin_unlock_irqrestore(&allpstore_lock, flags);
387 403
388 return 0; !! 404 inode_unlock(d_inode(root));
389 } <<
390 <<
391 /* <<
392 * Read all the records from the persistent st <<
393 * files in our filesystem. Don't warn about <<
394 * when we are re-scanning the backing store l <<
395 * error records. <<
396 */ <<
397 void pstore_get_records(int quiet) <<
398 { <<
399 struct dentry *root; <<
400 405
401 root = psinfo_lock_root(); !! 406 return 0;
402 if (!root) <<
403 return; <<
404 407
405 pstore_get_backend_records(psinfo, roo !! 408 fail_lockedalloc:
406 inode_unlock(d_inode(root)); 409 inode_unlock(d_inode(root));
>> 410 kfree(private);
>> 411 fail_alloc:
>> 412 iput(inode);
>> 413
>> 414 fail:
>> 415 return rc;
407 } 416 }
408 417
409 static int pstore_fill_super(struct super_bloc 418 static int pstore_fill_super(struct super_block *sb, void *data, int silent)
410 { 419 {
411 struct inode *inode; 420 struct inode *inode;
412 421
>> 422 save_mount_options(sb, data);
>> 423
>> 424 pstore_sb = sb;
>> 425
413 sb->s_maxbytes = MAX_LFS_FILE 426 sb->s_maxbytes = MAX_LFS_FILESIZE;
414 sb->s_blocksize = PAGE_SIZE; 427 sb->s_blocksize = PAGE_SIZE;
415 sb->s_blocksize_bits = PAGE_SHIFT; 428 sb->s_blocksize_bits = PAGE_SHIFT;
416 sb->s_magic = PSTOREFS_MAG 429 sb->s_magic = PSTOREFS_MAGIC;
417 sb->s_op = &pstore_ops; 430 sb->s_op = &pstore_ops;
418 sb->s_time_gran = 1; 431 sb->s_time_gran = 1;
419 432
420 parse_options(data); 433 parse_options(data);
421 434
422 inode = pstore_get_inode(sb); 435 inode = pstore_get_inode(sb);
423 if (inode) { 436 if (inode) {
424 inode->i_mode = S_IFDIR | 0750 !! 437 inode->i_mode = S_IFDIR | 0755;
425 inode->i_op = &pstore_dir_inod 438 inode->i_op = &pstore_dir_inode_operations;
426 inode->i_fop = &simple_dir_ope 439 inode->i_fop = &simple_dir_operations;
427 inc_nlink(inode); 440 inc_nlink(inode);
428 } 441 }
429 sb->s_root = d_make_root(inode); 442 sb->s_root = d_make_root(inode);
430 if (!sb->s_root) 443 if (!sb->s_root)
431 return -ENOMEM; 444 return -ENOMEM;
432 445
433 scoped_guard(mutex, &pstore_sb_lock) <<
434 pstore_sb = sb; <<
435 <<
436 pstore_get_records(0); 446 pstore_get_records(0);
437 447
438 return 0; 448 return 0;
439 } 449 }
440 450
441 static struct dentry *pstore_mount(struct file 451 static struct dentry *pstore_mount(struct file_system_type *fs_type,
442 int flags, const char *dev_name, void 452 int flags, const char *dev_name, void *data)
443 { 453 {
444 return mount_single(fs_type, flags, da 454 return mount_single(fs_type, flags, data, pstore_fill_super);
445 } 455 }
446 456
447 static void pstore_kill_sb(struct super_block 457 static void pstore_kill_sb(struct super_block *sb)
448 { 458 {
449 guard(mutex)(&pstore_sb_lock); <<
450 WARN_ON(pstore_sb && pstore_sb != sb); <<
451 <<
452 kill_litter_super(sb); 459 kill_litter_super(sb);
453 pstore_sb = NULL; 460 pstore_sb = NULL;
454 <<
455 guard(mutex)(&records_list_lock); <<
456 INIT_LIST_HEAD(&records_list); <<
457 } 461 }
458 462
459 static struct file_system_type pstore_fs_type 463 static struct file_system_type pstore_fs_type = {
460 .owner = THIS_MODULE, 464 .owner = THIS_MODULE,
461 .name = "pstore", 465 .name = "pstore",
462 .mount = pstore_mount, 466 .mount = pstore_mount,
463 .kill_sb = pstore_kill_sb, 467 .kill_sb = pstore_kill_sb,
464 }; 468 };
465 469
466 int __init pstore_init_fs(void) !! 470 static int __init init_pstore_fs(void)
467 { 471 {
468 int err; 472 int err;
469 473
470 /* Create a convenient mount point for 474 /* Create a convenient mount point for people to access pstore */
471 err = sysfs_create_mount_point(fs_kobj 475 err = sysfs_create_mount_point(fs_kobj, "pstore");
472 if (err) 476 if (err)
473 goto out; 477 goto out;
474 478
475 err = register_filesystem(&pstore_fs_t 479 err = register_filesystem(&pstore_fs_type);
476 if (err < 0) 480 if (err < 0)
477 sysfs_remove_mount_point(fs_ko 481 sysfs_remove_mount_point(fs_kobj, "pstore");
478 482
479 out: 483 out:
480 return err; 484 return err;
481 } 485 }
>> 486 module_init(init_pstore_fs)
482 487
483 void __exit pstore_exit_fs(void) !! 488 static void __exit exit_pstore_fs(void)
484 { 489 {
485 unregister_filesystem(&pstore_fs_type) 490 unregister_filesystem(&pstore_fs_type);
486 sysfs_remove_mount_point(fs_kobj, "pst 491 sysfs_remove_mount_point(fs_kobj, "pstore");
487 } 492 }
>> 493 module_exit(exit_pstore_fs)
>> 494
>> 495 MODULE_AUTHOR("Tony Luck <tony.luck@intel.com>");
>> 496 MODULE_LICENSE("GPL");
488 497
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
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