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