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Merge branch 'locking-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[mirror_ubuntu-artful-kernel.git] / fs / f2fs / super.c
1 /*
2 * fs/f2fs/super.c
3 *
4 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
5 * http://www.samsung.com/
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/fs.h>
14 #include <linux/statfs.h>
15 #include <linux/buffer_head.h>
16 #include <linux/backing-dev.h>
17 #include <linux/kthread.h>
18 #include <linux/parser.h>
19 #include <linux/mount.h>
20 #include <linux/seq_file.h>
21 #include <linux/proc_fs.h>
22 #include <linux/random.h>
23 #include <linux/exportfs.h>
24 #include <linux/blkdev.h>
25 #include <linux/f2fs_fs.h>
26 #include <linux/sysfs.h>
27
28 #include "f2fs.h"
29 #include "node.h"
30 #include "segment.h"
31 #include "xattr.h"
32 #include "gc.h"
33 #include "trace.h"
34
35 #define CREATE_TRACE_POINTS
36 #include <trace/events/f2fs.h>
37
38 static struct proc_dir_entry *f2fs_proc_root;
39 static struct kmem_cache *f2fs_inode_cachep;
40 static struct kset *f2fs_kset;
41
42 #ifdef CONFIG_F2FS_FAULT_INJECTION
43
44 char *fault_name[FAULT_MAX] = {
45 [FAULT_KMALLOC] = "kmalloc",
46 [FAULT_PAGE_ALLOC] = "page alloc",
47 [FAULT_ALLOC_NID] = "alloc nid",
48 [FAULT_ORPHAN] = "orphan",
49 [FAULT_BLOCK] = "no more block",
50 [FAULT_DIR_DEPTH] = "too big dir depth",
51 [FAULT_EVICT_INODE] = "evict_inode fail",
52 [FAULT_IO] = "IO error",
53 [FAULT_CHECKPOINT] = "checkpoint error",
54 };
55
56 static void f2fs_build_fault_attr(struct f2fs_sb_info *sbi,
57 unsigned int rate)
58 {
59 struct f2fs_fault_info *ffi = &sbi->fault_info;
60
61 if (rate) {
62 atomic_set(&ffi->inject_ops, 0);
63 ffi->inject_rate = rate;
64 ffi->inject_type = (1 << FAULT_MAX) - 1;
65 } else {
66 memset(ffi, 0, sizeof(struct f2fs_fault_info));
67 }
68 }
69 #endif
70
71 /* f2fs-wide shrinker description */
72 static struct shrinker f2fs_shrinker_info = {
73 .scan_objects = f2fs_shrink_scan,
74 .count_objects = f2fs_shrink_count,
75 .seeks = DEFAULT_SEEKS,
76 };
77
78 enum {
79 Opt_gc_background,
80 Opt_disable_roll_forward,
81 Opt_norecovery,
82 Opt_discard,
83 Opt_nodiscard,
84 Opt_noheap,
85 Opt_user_xattr,
86 Opt_nouser_xattr,
87 Opt_acl,
88 Opt_noacl,
89 Opt_active_logs,
90 Opt_disable_ext_identify,
91 Opt_inline_xattr,
92 Opt_inline_data,
93 Opt_inline_dentry,
94 Opt_noinline_dentry,
95 Opt_flush_merge,
96 Opt_noflush_merge,
97 Opt_nobarrier,
98 Opt_fastboot,
99 Opt_extent_cache,
100 Opt_noextent_cache,
101 Opt_noinline_data,
102 Opt_data_flush,
103 Opt_mode,
104 Opt_fault_injection,
105 Opt_lazytime,
106 Opt_nolazytime,
107 Opt_err,
108 };
109
110 static match_table_t f2fs_tokens = {
111 {Opt_gc_background, "background_gc=%s"},
112 {Opt_disable_roll_forward, "disable_roll_forward"},
113 {Opt_norecovery, "norecovery"},
114 {Opt_discard, "discard"},
115 {Opt_nodiscard, "nodiscard"},
116 {Opt_noheap, "no_heap"},
117 {Opt_user_xattr, "user_xattr"},
118 {Opt_nouser_xattr, "nouser_xattr"},
119 {Opt_acl, "acl"},
120 {Opt_noacl, "noacl"},
121 {Opt_active_logs, "active_logs=%u"},
122 {Opt_disable_ext_identify, "disable_ext_identify"},
123 {Opt_inline_xattr, "inline_xattr"},
124 {Opt_inline_data, "inline_data"},
125 {Opt_inline_dentry, "inline_dentry"},
126 {Opt_noinline_dentry, "noinline_dentry"},
127 {Opt_flush_merge, "flush_merge"},
128 {Opt_noflush_merge, "noflush_merge"},
129 {Opt_nobarrier, "nobarrier"},
130 {Opt_fastboot, "fastboot"},
131 {Opt_extent_cache, "extent_cache"},
132 {Opt_noextent_cache, "noextent_cache"},
133 {Opt_noinline_data, "noinline_data"},
134 {Opt_data_flush, "data_flush"},
135 {Opt_mode, "mode=%s"},
136 {Opt_fault_injection, "fault_injection=%u"},
137 {Opt_lazytime, "lazytime"},
138 {Opt_nolazytime, "nolazytime"},
139 {Opt_err, NULL},
140 };
141
142 /* Sysfs support for f2fs */
143 enum {
144 GC_THREAD, /* struct f2fs_gc_thread */
145 SM_INFO, /* struct f2fs_sm_info */
146 NM_INFO, /* struct f2fs_nm_info */
147 F2FS_SBI, /* struct f2fs_sb_info */
148 #ifdef CONFIG_F2FS_FAULT_INJECTION
149 FAULT_INFO_RATE, /* struct f2fs_fault_info */
150 FAULT_INFO_TYPE, /* struct f2fs_fault_info */
151 #endif
152 };
153
154 struct f2fs_attr {
155 struct attribute attr;
156 ssize_t (*show)(struct f2fs_attr *, struct f2fs_sb_info *, char *);
157 ssize_t (*store)(struct f2fs_attr *, struct f2fs_sb_info *,
158 const char *, size_t);
159 int struct_type;
160 int offset;
161 };
162
163 static unsigned char *__struct_ptr(struct f2fs_sb_info *sbi, int struct_type)
164 {
165 if (struct_type == GC_THREAD)
166 return (unsigned char *)sbi->gc_thread;
167 else if (struct_type == SM_INFO)
168 return (unsigned char *)SM_I(sbi);
169 else if (struct_type == NM_INFO)
170 return (unsigned char *)NM_I(sbi);
171 else if (struct_type == F2FS_SBI)
172 return (unsigned char *)sbi;
173 #ifdef CONFIG_F2FS_FAULT_INJECTION
174 else if (struct_type == FAULT_INFO_RATE ||
175 struct_type == FAULT_INFO_TYPE)
176 return (unsigned char *)&sbi->fault_info;
177 #endif
178 return NULL;
179 }
180
181 static ssize_t lifetime_write_kbytes_show(struct f2fs_attr *a,
182 struct f2fs_sb_info *sbi, char *buf)
183 {
184 struct super_block *sb = sbi->sb;
185
186 if (!sb->s_bdev->bd_part)
187 return snprintf(buf, PAGE_SIZE, "0\n");
188
189 return snprintf(buf, PAGE_SIZE, "%llu\n",
190 (unsigned long long)(sbi->kbytes_written +
191 BD_PART_WRITTEN(sbi)));
192 }
193
194 static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
195 struct f2fs_sb_info *sbi, char *buf)
196 {
197 unsigned char *ptr = NULL;
198 unsigned int *ui;
199
200 ptr = __struct_ptr(sbi, a->struct_type);
201 if (!ptr)
202 return -EINVAL;
203
204 ui = (unsigned int *)(ptr + a->offset);
205
206 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
207 }
208
209 static ssize_t f2fs_sbi_store(struct f2fs_attr *a,
210 struct f2fs_sb_info *sbi,
211 const char *buf, size_t count)
212 {
213 unsigned char *ptr;
214 unsigned long t;
215 unsigned int *ui;
216 ssize_t ret;
217
218 ptr = __struct_ptr(sbi, a->struct_type);
219 if (!ptr)
220 return -EINVAL;
221
222 ui = (unsigned int *)(ptr + a->offset);
223
224 ret = kstrtoul(skip_spaces(buf), 0, &t);
225 if (ret < 0)
226 return ret;
227 #ifdef CONFIG_F2FS_FAULT_INJECTION
228 if (a->struct_type == FAULT_INFO_TYPE && t >= (1 << FAULT_MAX))
229 return -EINVAL;
230 #endif
231 *ui = t;
232 return count;
233 }
234
235 static ssize_t f2fs_attr_show(struct kobject *kobj,
236 struct attribute *attr, char *buf)
237 {
238 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
239 s_kobj);
240 struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
241
242 return a->show ? a->show(a, sbi, buf) : 0;
243 }
244
245 static ssize_t f2fs_attr_store(struct kobject *kobj, struct attribute *attr,
246 const char *buf, size_t len)
247 {
248 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
249 s_kobj);
250 struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
251
252 return a->store ? a->store(a, sbi, buf, len) : 0;
253 }
254
255 static void f2fs_sb_release(struct kobject *kobj)
256 {
257 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
258 s_kobj);
259 complete(&sbi->s_kobj_unregister);
260 }
261
262 #define F2FS_ATTR_OFFSET(_struct_type, _name, _mode, _show, _store, _offset) \
263 static struct f2fs_attr f2fs_attr_##_name = { \
264 .attr = {.name = __stringify(_name), .mode = _mode }, \
265 .show = _show, \
266 .store = _store, \
267 .struct_type = _struct_type, \
268 .offset = _offset \
269 }
270
271 #define F2FS_RW_ATTR(struct_type, struct_name, name, elname) \
272 F2FS_ATTR_OFFSET(struct_type, name, 0644, \
273 f2fs_sbi_show, f2fs_sbi_store, \
274 offsetof(struct struct_name, elname))
275
276 #define F2FS_GENERAL_RO_ATTR(name) \
277 static struct f2fs_attr f2fs_attr_##name = __ATTR(name, 0444, name##_show, NULL)
278
279 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_min_sleep_time, min_sleep_time);
280 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_max_sleep_time, max_sleep_time);
281 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_no_gc_sleep_time, no_gc_sleep_time);
282 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_idle, gc_idle);
283 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, reclaim_segments, rec_prefree_segments);
284 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, max_small_discards, max_discards);
285 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, batched_trim_sections, trim_sections);
286 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, ipu_policy, ipu_policy);
287 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ipu_util, min_ipu_util);
288 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_fsync_blocks, min_fsync_blocks);
289 F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ram_thresh, ram_thresh);
290 F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ra_nid_pages, ra_nid_pages);
291 F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, dirty_nats_ratio, dirty_nats_ratio);
292 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, max_victim_search, max_victim_search);
293 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, dir_level, dir_level);
294 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, cp_interval, interval_time[CP_TIME]);
295 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, idle_interval, interval_time[REQ_TIME]);
296 #ifdef CONFIG_F2FS_FAULT_INJECTION
297 F2FS_RW_ATTR(FAULT_INFO_RATE, f2fs_fault_info, inject_rate, inject_rate);
298 F2FS_RW_ATTR(FAULT_INFO_TYPE, f2fs_fault_info, inject_type, inject_type);
299 #endif
300 F2FS_GENERAL_RO_ATTR(lifetime_write_kbytes);
301
302 #define ATTR_LIST(name) (&f2fs_attr_##name.attr)
303 static struct attribute *f2fs_attrs[] = {
304 ATTR_LIST(gc_min_sleep_time),
305 ATTR_LIST(gc_max_sleep_time),
306 ATTR_LIST(gc_no_gc_sleep_time),
307 ATTR_LIST(gc_idle),
308 ATTR_LIST(reclaim_segments),
309 ATTR_LIST(max_small_discards),
310 ATTR_LIST(batched_trim_sections),
311 ATTR_LIST(ipu_policy),
312 ATTR_LIST(min_ipu_util),
313 ATTR_LIST(min_fsync_blocks),
314 ATTR_LIST(max_victim_search),
315 ATTR_LIST(dir_level),
316 ATTR_LIST(ram_thresh),
317 ATTR_LIST(ra_nid_pages),
318 ATTR_LIST(dirty_nats_ratio),
319 ATTR_LIST(cp_interval),
320 ATTR_LIST(idle_interval),
321 #ifdef CONFIG_F2FS_FAULT_INJECTION
322 ATTR_LIST(inject_rate),
323 ATTR_LIST(inject_type),
324 #endif
325 ATTR_LIST(lifetime_write_kbytes),
326 NULL,
327 };
328
329 static const struct sysfs_ops f2fs_attr_ops = {
330 .show = f2fs_attr_show,
331 .store = f2fs_attr_store,
332 };
333
334 static struct kobj_type f2fs_ktype = {
335 .default_attrs = f2fs_attrs,
336 .sysfs_ops = &f2fs_attr_ops,
337 .release = f2fs_sb_release,
338 };
339
340 void f2fs_msg(struct super_block *sb, const char *level, const char *fmt, ...)
341 {
342 struct va_format vaf;
343 va_list args;
344
345 va_start(args, fmt);
346 vaf.fmt = fmt;
347 vaf.va = &args;
348 printk("%sF2FS-fs (%s): %pV\n", level, sb->s_id, &vaf);
349 va_end(args);
350 }
351
352 static void init_once(void *foo)
353 {
354 struct f2fs_inode_info *fi = (struct f2fs_inode_info *) foo;
355
356 inode_init_once(&fi->vfs_inode);
357 }
358
359 static int parse_options(struct super_block *sb, char *options)
360 {
361 struct f2fs_sb_info *sbi = F2FS_SB(sb);
362 struct request_queue *q;
363 substring_t args[MAX_OPT_ARGS];
364 char *p, *name;
365 int arg = 0;
366
367 if (!options)
368 return 0;
369
370 while ((p = strsep(&options, ",")) != NULL) {
371 int token;
372 if (!*p)
373 continue;
374 /*
375 * Initialize args struct so we know whether arg was
376 * found; some options take optional arguments.
377 */
378 args[0].to = args[0].from = NULL;
379 token = match_token(p, f2fs_tokens, args);
380
381 switch (token) {
382 case Opt_gc_background:
383 name = match_strdup(&args[0]);
384
385 if (!name)
386 return -ENOMEM;
387 if (strlen(name) == 2 && !strncmp(name, "on", 2)) {
388 set_opt(sbi, BG_GC);
389 clear_opt(sbi, FORCE_FG_GC);
390 } else if (strlen(name) == 3 && !strncmp(name, "off", 3)) {
391 clear_opt(sbi, BG_GC);
392 clear_opt(sbi, FORCE_FG_GC);
393 } else if (strlen(name) == 4 && !strncmp(name, "sync", 4)) {
394 set_opt(sbi, BG_GC);
395 set_opt(sbi, FORCE_FG_GC);
396 } else {
397 kfree(name);
398 return -EINVAL;
399 }
400 kfree(name);
401 break;
402 case Opt_disable_roll_forward:
403 set_opt(sbi, DISABLE_ROLL_FORWARD);
404 break;
405 case Opt_norecovery:
406 /* this option mounts f2fs with ro */
407 set_opt(sbi, DISABLE_ROLL_FORWARD);
408 if (!f2fs_readonly(sb))
409 return -EINVAL;
410 break;
411 case Opt_discard:
412 q = bdev_get_queue(sb->s_bdev);
413 if (blk_queue_discard(q)) {
414 set_opt(sbi, DISCARD);
415 } else if (!f2fs_sb_mounted_blkzoned(sb)) {
416 f2fs_msg(sb, KERN_WARNING,
417 "mounting with \"discard\" option, but "
418 "the device does not support discard");
419 }
420 break;
421 case Opt_nodiscard:
422 if (f2fs_sb_mounted_blkzoned(sb)) {
423 f2fs_msg(sb, KERN_WARNING,
424 "discard is required for zoned block devices");
425 return -EINVAL;
426 }
427 clear_opt(sbi, DISCARD);
428 break;
429 case Opt_noheap:
430 set_opt(sbi, NOHEAP);
431 break;
432 #ifdef CONFIG_F2FS_FS_XATTR
433 case Opt_user_xattr:
434 set_opt(sbi, XATTR_USER);
435 break;
436 case Opt_nouser_xattr:
437 clear_opt(sbi, XATTR_USER);
438 break;
439 case Opt_inline_xattr:
440 set_opt(sbi, INLINE_XATTR);
441 break;
442 #else
443 case Opt_user_xattr:
444 f2fs_msg(sb, KERN_INFO,
445 "user_xattr options not supported");
446 break;
447 case Opt_nouser_xattr:
448 f2fs_msg(sb, KERN_INFO,
449 "nouser_xattr options not supported");
450 break;
451 case Opt_inline_xattr:
452 f2fs_msg(sb, KERN_INFO,
453 "inline_xattr options not supported");
454 break;
455 #endif
456 #ifdef CONFIG_F2FS_FS_POSIX_ACL
457 case Opt_acl:
458 set_opt(sbi, POSIX_ACL);
459 break;
460 case Opt_noacl:
461 clear_opt(sbi, POSIX_ACL);
462 break;
463 #else
464 case Opt_acl:
465 f2fs_msg(sb, KERN_INFO, "acl options not supported");
466 break;
467 case Opt_noacl:
468 f2fs_msg(sb, KERN_INFO, "noacl options not supported");
469 break;
470 #endif
471 case Opt_active_logs:
472 if (args->from && match_int(args, &arg))
473 return -EINVAL;
474 if (arg != 2 && arg != 4 && arg != NR_CURSEG_TYPE)
475 return -EINVAL;
476 sbi->active_logs = arg;
477 break;
478 case Opt_disable_ext_identify:
479 set_opt(sbi, DISABLE_EXT_IDENTIFY);
480 break;
481 case Opt_inline_data:
482 set_opt(sbi, INLINE_DATA);
483 break;
484 case Opt_inline_dentry:
485 set_opt(sbi, INLINE_DENTRY);
486 break;
487 case Opt_noinline_dentry:
488 clear_opt(sbi, INLINE_DENTRY);
489 break;
490 case Opt_flush_merge:
491 set_opt(sbi, FLUSH_MERGE);
492 break;
493 case Opt_noflush_merge:
494 clear_opt(sbi, FLUSH_MERGE);
495 break;
496 case Opt_nobarrier:
497 set_opt(sbi, NOBARRIER);
498 break;
499 case Opt_fastboot:
500 set_opt(sbi, FASTBOOT);
501 break;
502 case Opt_extent_cache:
503 set_opt(sbi, EXTENT_CACHE);
504 break;
505 case Opt_noextent_cache:
506 clear_opt(sbi, EXTENT_CACHE);
507 break;
508 case Opt_noinline_data:
509 clear_opt(sbi, INLINE_DATA);
510 break;
511 case Opt_data_flush:
512 set_opt(sbi, DATA_FLUSH);
513 break;
514 case Opt_mode:
515 name = match_strdup(&args[0]);
516
517 if (!name)
518 return -ENOMEM;
519 if (strlen(name) == 8 &&
520 !strncmp(name, "adaptive", 8)) {
521 if (f2fs_sb_mounted_blkzoned(sb)) {
522 f2fs_msg(sb, KERN_WARNING,
523 "adaptive mode is not allowed with "
524 "zoned block device feature");
525 kfree(name);
526 return -EINVAL;
527 }
528 set_opt_mode(sbi, F2FS_MOUNT_ADAPTIVE);
529 } else if (strlen(name) == 3 &&
530 !strncmp(name, "lfs", 3)) {
531 set_opt_mode(sbi, F2FS_MOUNT_LFS);
532 } else {
533 kfree(name);
534 return -EINVAL;
535 }
536 kfree(name);
537 break;
538 case Opt_fault_injection:
539 if (args->from && match_int(args, &arg))
540 return -EINVAL;
541 #ifdef CONFIG_F2FS_FAULT_INJECTION
542 f2fs_build_fault_attr(sbi, arg);
543 #else
544 f2fs_msg(sb, KERN_INFO,
545 "FAULT_INJECTION was not selected");
546 #endif
547 break;
548 case Opt_lazytime:
549 sb->s_flags |= MS_LAZYTIME;
550 break;
551 case Opt_nolazytime:
552 sb->s_flags &= ~MS_LAZYTIME;
553 break;
554 default:
555 f2fs_msg(sb, KERN_ERR,
556 "Unrecognized mount option \"%s\" or missing value",
557 p);
558 return -EINVAL;
559 }
560 }
561 return 0;
562 }
563
564 static struct inode *f2fs_alloc_inode(struct super_block *sb)
565 {
566 struct f2fs_inode_info *fi;
567
568 fi = kmem_cache_alloc(f2fs_inode_cachep, GFP_F2FS_ZERO);
569 if (!fi)
570 return NULL;
571
572 init_once((void *) fi);
573
574 /* Initialize f2fs-specific inode info */
575 fi->vfs_inode.i_version = 1;
576 atomic_set(&fi->dirty_pages, 0);
577 fi->i_current_depth = 1;
578 fi->i_advise = 0;
579 init_rwsem(&fi->i_sem);
580 INIT_LIST_HEAD(&fi->dirty_list);
581 INIT_LIST_HEAD(&fi->gdirty_list);
582 INIT_LIST_HEAD(&fi->inmem_pages);
583 mutex_init(&fi->inmem_lock);
584 init_rwsem(&fi->dio_rwsem[READ]);
585 init_rwsem(&fi->dio_rwsem[WRITE]);
586
587 /* Will be used by directory only */
588 fi->i_dir_level = F2FS_SB(sb)->dir_level;
589 return &fi->vfs_inode;
590 }
591
592 static int f2fs_drop_inode(struct inode *inode)
593 {
594 /*
595 * This is to avoid a deadlock condition like below.
596 * writeback_single_inode(inode)
597 * - f2fs_write_data_page
598 * - f2fs_gc -> iput -> evict
599 * - inode_wait_for_writeback(inode)
600 */
601 if ((!inode_unhashed(inode) && inode->i_state & I_SYNC)) {
602 if (!inode->i_nlink && !is_bad_inode(inode)) {
603 /* to avoid evict_inode call simultaneously */
604 atomic_inc(&inode->i_count);
605 spin_unlock(&inode->i_lock);
606
607 /* some remained atomic pages should discarded */
608 if (f2fs_is_atomic_file(inode))
609 drop_inmem_pages(inode);
610
611 /* should remain fi->extent_tree for writepage */
612 f2fs_destroy_extent_node(inode);
613
614 sb_start_intwrite(inode->i_sb);
615 f2fs_i_size_write(inode, 0);
616
617 if (F2FS_HAS_BLOCKS(inode))
618 f2fs_truncate(inode);
619
620 sb_end_intwrite(inode->i_sb);
621
622 fscrypt_put_encryption_info(inode, NULL);
623 spin_lock(&inode->i_lock);
624 atomic_dec(&inode->i_count);
625 }
626 return 0;
627 }
628
629 return generic_drop_inode(inode);
630 }
631
632 int f2fs_inode_dirtied(struct inode *inode, bool sync)
633 {
634 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
635 int ret = 0;
636
637 spin_lock(&sbi->inode_lock[DIRTY_META]);
638 if (is_inode_flag_set(inode, FI_DIRTY_INODE)) {
639 ret = 1;
640 } else {
641 set_inode_flag(inode, FI_DIRTY_INODE);
642 stat_inc_dirty_inode(sbi, DIRTY_META);
643 }
644 if (sync && list_empty(&F2FS_I(inode)->gdirty_list)) {
645 list_add_tail(&F2FS_I(inode)->gdirty_list,
646 &sbi->inode_list[DIRTY_META]);
647 inc_page_count(sbi, F2FS_DIRTY_IMETA);
648 }
649 spin_unlock(&sbi->inode_lock[DIRTY_META]);
650 return ret;
651 }
652
653 void f2fs_inode_synced(struct inode *inode)
654 {
655 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
656
657 spin_lock(&sbi->inode_lock[DIRTY_META]);
658 if (!is_inode_flag_set(inode, FI_DIRTY_INODE)) {
659 spin_unlock(&sbi->inode_lock[DIRTY_META]);
660 return;
661 }
662 if (!list_empty(&F2FS_I(inode)->gdirty_list)) {
663 list_del_init(&F2FS_I(inode)->gdirty_list);
664 dec_page_count(sbi, F2FS_DIRTY_IMETA);
665 }
666 clear_inode_flag(inode, FI_DIRTY_INODE);
667 clear_inode_flag(inode, FI_AUTO_RECOVER);
668 stat_dec_dirty_inode(F2FS_I_SB(inode), DIRTY_META);
669 spin_unlock(&sbi->inode_lock[DIRTY_META]);
670 }
671
672 /*
673 * f2fs_dirty_inode() is called from __mark_inode_dirty()
674 *
675 * We should call set_dirty_inode to write the dirty inode through write_inode.
676 */
677 static void f2fs_dirty_inode(struct inode *inode, int flags)
678 {
679 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
680
681 if (inode->i_ino == F2FS_NODE_INO(sbi) ||
682 inode->i_ino == F2FS_META_INO(sbi))
683 return;
684
685 if (flags == I_DIRTY_TIME)
686 return;
687
688 if (is_inode_flag_set(inode, FI_AUTO_RECOVER))
689 clear_inode_flag(inode, FI_AUTO_RECOVER);
690
691 f2fs_inode_dirtied(inode, false);
692 }
693
694 static void f2fs_i_callback(struct rcu_head *head)
695 {
696 struct inode *inode = container_of(head, struct inode, i_rcu);
697 kmem_cache_free(f2fs_inode_cachep, F2FS_I(inode));
698 }
699
700 static void f2fs_destroy_inode(struct inode *inode)
701 {
702 call_rcu(&inode->i_rcu, f2fs_i_callback);
703 }
704
705 static void destroy_percpu_info(struct f2fs_sb_info *sbi)
706 {
707 percpu_counter_destroy(&sbi->alloc_valid_block_count);
708 percpu_counter_destroy(&sbi->total_valid_inode_count);
709 }
710
711 static void destroy_device_list(struct f2fs_sb_info *sbi)
712 {
713 int i;
714
715 for (i = 0; i < sbi->s_ndevs; i++) {
716 blkdev_put(FDEV(i).bdev, FMODE_EXCL);
717 #ifdef CONFIG_BLK_DEV_ZONED
718 kfree(FDEV(i).blkz_type);
719 #endif
720 }
721 kfree(sbi->devs);
722 }
723
724 static void f2fs_put_super(struct super_block *sb)
725 {
726 struct f2fs_sb_info *sbi = F2FS_SB(sb);
727
728 if (sbi->s_proc) {
729 remove_proc_entry("segment_info", sbi->s_proc);
730 remove_proc_entry("segment_bits", sbi->s_proc);
731 remove_proc_entry(sb->s_id, f2fs_proc_root);
732 }
733 kobject_del(&sbi->s_kobj);
734
735 stop_gc_thread(sbi);
736
737 /* prevent remaining shrinker jobs */
738 mutex_lock(&sbi->umount_mutex);
739
740 /*
741 * We don't need to do checkpoint when superblock is clean.
742 * But, the previous checkpoint was not done by umount, it needs to do
743 * clean checkpoint again.
744 */
745 if (is_sbi_flag_set(sbi, SBI_IS_DIRTY) ||
746 !is_set_ckpt_flags(sbi, CP_UMOUNT_FLAG)) {
747 struct cp_control cpc = {
748 .reason = CP_UMOUNT,
749 };
750 write_checkpoint(sbi, &cpc);
751 }
752
753 /* write_checkpoint can update stat informaion */
754 f2fs_destroy_stats(sbi);
755
756 /*
757 * normally superblock is clean, so we need to release this.
758 * In addition, EIO will skip do checkpoint, we need this as well.
759 */
760 release_ino_entry(sbi, true);
761
762 f2fs_leave_shrinker(sbi);
763 mutex_unlock(&sbi->umount_mutex);
764
765 /* our cp_error case, we can wait for any writeback page */
766 f2fs_flush_merged_bios(sbi);
767
768 iput(sbi->node_inode);
769 iput(sbi->meta_inode);
770
771 /* destroy f2fs internal modules */
772 destroy_node_manager(sbi);
773 destroy_segment_manager(sbi);
774
775 kfree(sbi->ckpt);
776 kobject_put(&sbi->s_kobj);
777 wait_for_completion(&sbi->s_kobj_unregister);
778
779 sb->s_fs_info = NULL;
780 if (sbi->s_chksum_driver)
781 crypto_free_shash(sbi->s_chksum_driver);
782 kfree(sbi->raw_super);
783
784 destroy_device_list(sbi);
785
786 destroy_percpu_info(sbi);
787 kfree(sbi);
788 }
789
790 int f2fs_sync_fs(struct super_block *sb, int sync)
791 {
792 struct f2fs_sb_info *sbi = F2FS_SB(sb);
793 int err = 0;
794
795 trace_f2fs_sync_fs(sb, sync);
796
797 if (sync) {
798 struct cp_control cpc;
799
800 cpc.reason = __get_cp_reason(sbi);
801
802 mutex_lock(&sbi->gc_mutex);
803 err = write_checkpoint(sbi, &cpc);
804 mutex_unlock(&sbi->gc_mutex);
805 }
806 f2fs_trace_ios(NULL, 1);
807
808 return err;
809 }
810
811 static int f2fs_freeze(struct super_block *sb)
812 {
813 if (f2fs_readonly(sb))
814 return 0;
815
816 /* IO error happened before */
817 if (unlikely(f2fs_cp_error(F2FS_SB(sb))))
818 return -EIO;
819
820 /* must be clean, since sync_filesystem() was already called */
821 if (is_sbi_flag_set(F2FS_SB(sb), SBI_IS_DIRTY))
822 return -EINVAL;
823 return 0;
824 }
825
826 static int f2fs_unfreeze(struct super_block *sb)
827 {
828 return 0;
829 }
830
831 static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf)
832 {
833 struct super_block *sb = dentry->d_sb;
834 struct f2fs_sb_info *sbi = F2FS_SB(sb);
835 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
836 block_t total_count, user_block_count, start_count, ovp_count;
837
838 total_count = le64_to_cpu(sbi->raw_super->block_count);
839 user_block_count = sbi->user_block_count;
840 start_count = le32_to_cpu(sbi->raw_super->segment0_blkaddr);
841 ovp_count = SM_I(sbi)->ovp_segments << sbi->log_blocks_per_seg;
842 buf->f_type = F2FS_SUPER_MAGIC;
843 buf->f_bsize = sbi->blocksize;
844
845 buf->f_blocks = total_count - start_count;
846 buf->f_bfree = user_block_count - valid_user_blocks(sbi) + ovp_count;
847 buf->f_bavail = user_block_count - valid_user_blocks(sbi);
848
849 buf->f_files = sbi->total_node_count - F2FS_RESERVED_NODE_NUM;
850 buf->f_ffree = min(buf->f_files - valid_node_count(sbi),
851 buf->f_bavail);
852
853 buf->f_namelen = F2FS_NAME_LEN;
854 buf->f_fsid.val[0] = (u32)id;
855 buf->f_fsid.val[1] = (u32)(id >> 32);
856
857 return 0;
858 }
859
860 static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
861 {
862 struct f2fs_sb_info *sbi = F2FS_SB(root->d_sb);
863
864 if (!f2fs_readonly(sbi->sb) && test_opt(sbi, BG_GC)) {
865 if (test_opt(sbi, FORCE_FG_GC))
866 seq_printf(seq, ",background_gc=%s", "sync");
867 else
868 seq_printf(seq, ",background_gc=%s", "on");
869 } else {
870 seq_printf(seq, ",background_gc=%s", "off");
871 }
872 if (test_opt(sbi, DISABLE_ROLL_FORWARD))
873 seq_puts(seq, ",disable_roll_forward");
874 if (test_opt(sbi, DISCARD))
875 seq_puts(seq, ",discard");
876 if (test_opt(sbi, NOHEAP))
877 seq_puts(seq, ",no_heap_alloc");
878 #ifdef CONFIG_F2FS_FS_XATTR
879 if (test_opt(sbi, XATTR_USER))
880 seq_puts(seq, ",user_xattr");
881 else
882 seq_puts(seq, ",nouser_xattr");
883 if (test_opt(sbi, INLINE_XATTR))
884 seq_puts(seq, ",inline_xattr");
885 #endif
886 #ifdef CONFIG_F2FS_FS_POSIX_ACL
887 if (test_opt(sbi, POSIX_ACL))
888 seq_puts(seq, ",acl");
889 else
890 seq_puts(seq, ",noacl");
891 #endif
892 if (test_opt(sbi, DISABLE_EXT_IDENTIFY))
893 seq_puts(seq, ",disable_ext_identify");
894 if (test_opt(sbi, INLINE_DATA))
895 seq_puts(seq, ",inline_data");
896 else
897 seq_puts(seq, ",noinline_data");
898 if (test_opt(sbi, INLINE_DENTRY))
899 seq_puts(seq, ",inline_dentry");
900 else
901 seq_puts(seq, ",noinline_dentry");
902 if (!f2fs_readonly(sbi->sb) && test_opt(sbi, FLUSH_MERGE))
903 seq_puts(seq, ",flush_merge");
904 if (test_opt(sbi, NOBARRIER))
905 seq_puts(seq, ",nobarrier");
906 if (test_opt(sbi, FASTBOOT))
907 seq_puts(seq, ",fastboot");
908 if (test_opt(sbi, EXTENT_CACHE))
909 seq_puts(seq, ",extent_cache");
910 else
911 seq_puts(seq, ",noextent_cache");
912 if (test_opt(sbi, DATA_FLUSH))
913 seq_puts(seq, ",data_flush");
914
915 seq_puts(seq, ",mode=");
916 if (test_opt(sbi, ADAPTIVE))
917 seq_puts(seq, "adaptive");
918 else if (test_opt(sbi, LFS))
919 seq_puts(seq, "lfs");
920 seq_printf(seq, ",active_logs=%u", sbi->active_logs);
921
922 return 0;
923 }
924
925 static int segment_info_seq_show(struct seq_file *seq, void *offset)
926 {
927 struct super_block *sb = seq->private;
928 struct f2fs_sb_info *sbi = F2FS_SB(sb);
929 unsigned int total_segs =
930 le32_to_cpu(sbi->raw_super->segment_count_main);
931 int i;
932
933 seq_puts(seq, "format: segment_type|valid_blocks\n"
934 "segment_type(0:HD, 1:WD, 2:CD, 3:HN, 4:WN, 5:CN)\n");
935
936 for (i = 0; i < total_segs; i++) {
937 struct seg_entry *se = get_seg_entry(sbi, i);
938
939 if ((i % 10) == 0)
940 seq_printf(seq, "%-10d", i);
941 seq_printf(seq, "%d|%-3u", se->type,
942 get_valid_blocks(sbi, i, 1));
943 if ((i % 10) == 9 || i == (total_segs - 1))
944 seq_putc(seq, '\n');
945 else
946 seq_putc(seq, ' ');
947 }
948
949 return 0;
950 }
951
952 static int segment_bits_seq_show(struct seq_file *seq, void *offset)
953 {
954 struct super_block *sb = seq->private;
955 struct f2fs_sb_info *sbi = F2FS_SB(sb);
956 unsigned int total_segs =
957 le32_to_cpu(sbi->raw_super->segment_count_main);
958 int i, j;
959
960 seq_puts(seq, "format: segment_type|valid_blocks|bitmaps\n"
961 "segment_type(0:HD, 1:WD, 2:CD, 3:HN, 4:WN, 5:CN)\n");
962
963 for (i = 0; i < total_segs; i++) {
964 struct seg_entry *se = get_seg_entry(sbi, i);
965
966 seq_printf(seq, "%-10d", i);
967 seq_printf(seq, "%d|%-3u|", se->type,
968 get_valid_blocks(sbi, i, 1));
969 for (j = 0; j < SIT_VBLOCK_MAP_SIZE; j++)
970 seq_printf(seq, " %.2x", se->cur_valid_map[j]);
971 seq_putc(seq, '\n');
972 }
973 return 0;
974 }
975
976 #define F2FS_PROC_FILE_DEF(_name) \
977 static int _name##_open_fs(struct inode *inode, struct file *file) \
978 { \
979 return single_open(file, _name##_seq_show, PDE_DATA(inode)); \
980 } \
981 \
982 static const struct file_operations f2fs_seq_##_name##_fops = { \
983 .open = _name##_open_fs, \
984 .read = seq_read, \
985 .llseek = seq_lseek, \
986 .release = single_release, \
987 };
988
989 F2FS_PROC_FILE_DEF(segment_info);
990 F2FS_PROC_FILE_DEF(segment_bits);
991
992 static void default_options(struct f2fs_sb_info *sbi)
993 {
994 /* init some FS parameters */
995 sbi->active_logs = NR_CURSEG_TYPE;
996
997 set_opt(sbi, BG_GC);
998 set_opt(sbi, INLINE_DATA);
999 set_opt(sbi, INLINE_DENTRY);
1000 set_opt(sbi, EXTENT_CACHE);
1001 sbi->sb->s_flags |= MS_LAZYTIME;
1002 set_opt(sbi, FLUSH_MERGE);
1003 if (f2fs_sb_mounted_blkzoned(sbi->sb)) {
1004 set_opt_mode(sbi, F2FS_MOUNT_LFS);
1005 set_opt(sbi, DISCARD);
1006 } else {
1007 set_opt_mode(sbi, F2FS_MOUNT_ADAPTIVE);
1008 }
1009
1010 #ifdef CONFIG_F2FS_FS_XATTR
1011 set_opt(sbi, XATTR_USER);
1012 #endif
1013 #ifdef CONFIG_F2FS_FS_POSIX_ACL
1014 set_opt(sbi, POSIX_ACL);
1015 #endif
1016
1017 #ifdef CONFIG_F2FS_FAULT_INJECTION
1018 f2fs_build_fault_attr(sbi, 0);
1019 #endif
1020 }
1021
1022 static int f2fs_remount(struct super_block *sb, int *flags, char *data)
1023 {
1024 struct f2fs_sb_info *sbi = F2FS_SB(sb);
1025 struct f2fs_mount_info org_mount_opt;
1026 int err, active_logs;
1027 bool need_restart_gc = false;
1028 bool need_stop_gc = false;
1029 bool no_extent_cache = !test_opt(sbi, EXTENT_CACHE);
1030 #ifdef CONFIG_F2FS_FAULT_INJECTION
1031 struct f2fs_fault_info ffi = sbi->fault_info;
1032 #endif
1033
1034 /*
1035 * Save the old mount options in case we
1036 * need to restore them.
1037 */
1038 org_mount_opt = sbi->mount_opt;
1039 active_logs = sbi->active_logs;
1040
1041 /* recover superblocks we couldn't write due to previous RO mount */
1042 if (!(*flags & MS_RDONLY) && is_sbi_flag_set(sbi, SBI_NEED_SB_WRITE)) {
1043 err = f2fs_commit_super(sbi, false);
1044 f2fs_msg(sb, KERN_INFO,
1045 "Try to recover all the superblocks, ret: %d", err);
1046 if (!err)
1047 clear_sbi_flag(sbi, SBI_NEED_SB_WRITE);
1048 }
1049
1050 sbi->mount_opt.opt = 0;
1051 default_options(sbi);
1052
1053 /* parse mount options */
1054 err = parse_options(sb, data);
1055 if (err)
1056 goto restore_opts;
1057
1058 /*
1059 * Previous and new state of filesystem is RO,
1060 * so skip checking GC and FLUSH_MERGE conditions.
1061 */
1062 if (f2fs_readonly(sb) && (*flags & MS_RDONLY))
1063 goto skip;
1064
1065 /* disallow enable/disable extent_cache dynamically */
1066 if (no_extent_cache == !!test_opt(sbi, EXTENT_CACHE)) {
1067 err = -EINVAL;
1068 f2fs_msg(sbi->sb, KERN_WARNING,
1069 "switch extent_cache option is not allowed");
1070 goto restore_opts;
1071 }
1072
1073 /*
1074 * We stop the GC thread if FS is mounted as RO
1075 * or if background_gc = off is passed in mount
1076 * option. Also sync the filesystem.
1077 */
1078 if ((*flags & MS_RDONLY) || !test_opt(sbi, BG_GC)) {
1079 if (sbi->gc_thread) {
1080 stop_gc_thread(sbi);
1081 need_restart_gc = true;
1082 }
1083 } else if (!sbi->gc_thread) {
1084 err = start_gc_thread(sbi);
1085 if (err)
1086 goto restore_opts;
1087 need_stop_gc = true;
1088 }
1089
1090 if (*flags & MS_RDONLY) {
1091 writeback_inodes_sb(sb, WB_REASON_SYNC);
1092 sync_inodes_sb(sb);
1093
1094 set_sbi_flag(sbi, SBI_IS_DIRTY);
1095 set_sbi_flag(sbi, SBI_IS_CLOSE);
1096 f2fs_sync_fs(sb, 1);
1097 clear_sbi_flag(sbi, SBI_IS_CLOSE);
1098 }
1099
1100 /*
1101 * We stop issue flush thread if FS is mounted as RO
1102 * or if flush_merge is not passed in mount option.
1103 */
1104 if ((*flags & MS_RDONLY) || !test_opt(sbi, FLUSH_MERGE)) {
1105 clear_opt(sbi, FLUSH_MERGE);
1106 destroy_flush_cmd_control(sbi, false);
1107 } else {
1108 err = create_flush_cmd_control(sbi);
1109 if (err)
1110 goto restore_gc;
1111 }
1112 skip:
1113 /* Update the POSIXACL Flag */
1114 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1115 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
1116
1117 return 0;
1118 restore_gc:
1119 if (need_restart_gc) {
1120 if (start_gc_thread(sbi))
1121 f2fs_msg(sbi->sb, KERN_WARNING,
1122 "background gc thread has stopped");
1123 } else if (need_stop_gc) {
1124 stop_gc_thread(sbi);
1125 }
1126 restore_opts:
1127 sbi->mount_opt = org_mount_opt;
1128 sbi->active_logs = active_logs;
1129 #ifdef CONFIG_F2FS_FAULT_INJECTION
1130 sbi->fault_info = ffi;
1131 #endif
1132 return err;
1133 }
1134
1135 static struct super_operations f2fs_sops = {
1136 .alloc_inode = f2fs_alloc_inode,
1137 .drop_inode = f2fs_drop_inode,
1138 .destroy_inode = f2fs_destroy_inode,
1139 .write_inode = f2fs_write_inode,
1140 .dirty_inode = f2fs_dirty_inode,
1141 .show_options = f2fs_show_options,
1142 .evict_inode = f2fs_evict_inode,
1143 .put_super = f2fs_put_super,
1144 .sync_fs = f2fs_sync_fs,
1145 .freeze_fs = f2fs_freeze,
1146 .unfreeze_fs = f2fs_unfreeze,
1147 .statfs = f2fs_statfs,
1148 .remount_fs = f2fs_remount,
1149 };
1150
1151 #ifdef CONFIG_F2FS_FS_ENCRYPTION
1152 static int f2fs_get_context(struct inode *inode, void *ctx, size_t len)
1153 {
1154 return f2fs_getxattr(inode, F2FS_XATTR_INDEX_ENCRYPTION,
1155 F2FS_XATTR_NAME_ENCRYPTION_CONTEXT,
1156 ctx, len, NULL);
1157 }
1158
1159 static int f2fs_set_context(struct inode *inode, const void *ctx, size_t len,
1160 void *fs_data)
1161 {
1162 return f2fs_setxattr(inode, F2FS_XATTR_INDEX_ENCRYPTION,
1163 F2FS_XATTR_NAME_ENCRYPTION_CONTEXT,
1164 ctx, len, fs_data, XATTR_CREATE);
1165 }
1166
1167 static unsigned f2fs_max_namelen(struct inode *inode)
1168 {
1169 return S_ISLNK(inode->i_mode) ?
1170 inode->i_sb->s_blocksize : F2FS_NAME_LEN;
1171 }
1172
1173 static const struct fscrypt_operations f2fs_cryptops = {
1174 .key_prefix = "f2fs:",
1175 .get_context = f2fs_get_context,
1176 .set_context = f2fs_set_context,
1177 .is_encrypted = f2fs_encrypted_inode,
1178 .empty_dir = f2fs_empty_dir,
1179 .max_namelen = f2fs_max_namelen,
1180 };
1181 #else
1182 static const struct fscrypt_operations f2fs_cryptops = {
1183 .is_encrypted = f2fs_encrypted_inode,
1184 };
1185 #endif
1186
1187 static struct inode *f2fs_nfs_get_inode(struct super_block *sb,
1188 u64 ino, u32 generation)
1189 {
1190 struct f2fs_sb_info *sbi = F2FS_SB(sb);
1191 struct inode *inode;
1192
1193 if (check_nid_range(sbi, ino))
1194 return ERR_PTR(-ESTALE);
1195
1196 /*
1197 * f2fs_iget isn't quite right if the inode is currently unallocated!
1198 * However f2fs_iget currently does appropriate checks to handle stale
1199 * inodes so everything is OK.
1200 */
1201 inode = f2fs_iget(sb, ino);
1202 if (IS_ERR(inode))
1203 return ERR_CAST(inode);
1204 if (unlikely(generation && inode->i_generation != generation)) {
1205 /* we didn't find the right inode.. */
1206 iput(inode);
1207 return ERR_PTR(-ESTALE);
1208 }
1209 return inode;
1210 }
1211
1212 static struct dentry *f2fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
1213 int fh_len, int fh_type)
1214 {
1215 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1216 f2fs_nfs_get_inode);
1217 }
1218
1219 static struct dentry *f2fs_fh_to_parent(struct super_block *sb, struct fid *fid,
1220 int fh_len, int fh_type)
1221 {
1222 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1223 f2fs_nfs_get_inode);
1224 }
1225
1226 static const struct export_operations f2fs_export_ops = {
1227 .fh_to_dentry = f2fs_fh_to_dentry,
1228 .fh_to_parent = f2fs_fh_to_parent,
1229 .get_parent = f2fs_get_parent,
1230 };
1231
1232 static loff_t max_file_blocks(void)
1233 {
1234 loff_t result = (DEF_ADDRS_PER_INODE - F2FS_INLINE_XATTR_ADDRS);
1235 loff_t leaf_count = ADDRS_PER_BLOCK;
1236
1237 /* two direct node blocks */
1238 result += (leaf_count * 2);
1239
1240 /* two indirect node blocks */
1241 leaf_count *= NIDS_PER_BLOCK;
1242 result += (leaf_count * 2);
1243
1244 /* one double indirect node block */
1245 leaf_count *= NIDS_PER_BLOCK;
1246 result += leaf_count;
1247
1248 return result;
1249 }
1250
1251 static int __f2fs_commit_super(struct buffer_head *bh,
1252 struct f2fs_super_block *super)
1253 {
1254 lock_buffer(bh);
1255 if (super)
1256 memcpy(bh->b_data + F2FS_SUPER_OFFSET, super, sizeof(*super));
1257 set_buffer_uptodate(bh);
1258 set_buffer_dirty(bh);
1259 unlock_buffer(bh);
1260
1261 /* it's rare case, we can do fua all the time */
1262 return __sync_dirty_buffer(bh, REQ_PREFLUSH | REQ_FUA);
1263 }
1264
1265 static inline bool sanity_check_area_boundary(struct f2fs_sb_info *sbi,
1266 struct buffer_head *bh)
1267 {
1268 struct f2fs_super_block *raw_super = (struct f2fs_super_block *)
1269 (bh->b_data + F2FS_SUPER_OFFSET);
1270 struct super_block *sb = sbi->sb;
1271 u32 segment0_blkaddr = le32_to_cpu(raw_super->segment0_blkaddr);
1272 u32 cp_blkaddr = le32_to_cpu(raw_super->cp_blkaddr);
1273 u32 sit_blkaddr = le32_to_cpu(raw_super->sit_blkaddr);
1274 u32 nat_blkaddr = le32_to_cpu(raw_super->nat_blkaddr);
1275 u32 ssa_blkaddr = le32_to_cpu(raw_super->ssa_blkaddr);
1276 u32 main_blkaddr = le32_to_cpu(raw_super->main_blkaddr);
1277 u32 segment_count_ckpt = le32_to_cpu(raw_super->segment_count_ckpt);
1278 u32 segment_count_sit = le32_to_cpu(raw_super->segment_count_sit);
1279 u32 segment_count_nat = le32_to_cpu(raw_super->segment_count_nat);
1280 u32 segment_count_ssa = le32_to_cpu(raw_super->segment_count_ssa);
1281 u32 segment_count_main = le32_to_cpu(raw_super->segment_count_main);
1282 u32 segment_count = le32_to_cpu(raw_super->segment_count);
1283 u32 log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
1284 u64 main_end_blkaddr = main_blkaddr +
1285 (segment_count_main << log_blocks_per_seg);
1286 u64 seg_end_blkaddr = segment0_blkaddr +
1287 (segment_count << log_blocks_per_seg);
1288
1289 if (segment0_blkaddr != cp_blkaddr) {
1290 f2fs_msg(sb, KERN_INFO,
1291 "Mismatch start address, segment0(%u) cp_blkaddr(%u)",
1292 segment0_blkaddr, cp_blkaddr);
1293 return true;
1294 }
1295
1296 if (cp_blkaddr + (segment_count_ckpt << log_blocks_per_seg) !=
1297 sit_blkaddr) {
1298 f2fs_msg(sb, KERN_INFO,
1299 "Wrong CP boundary, start(%u) end(%u) blocks(%u)",
1300 cp_blkaddr, sit_blkaddr,
1301 segment_count_ckpt << log_blocks_per_seg);
1302 return true;
1303 }
1304
1305 if (sit_blkaddr + (segment_count_sit << log_blocks_per_seg) !=
1306 nat_blkaddr) {
1307 f2fs_msg(sb, KERN_INFO,
1308 "Wrong SIT boundary, start(%u) end(%u) blocks(%u)",
1309 sit_blkaddr, nat_blkaddr,
1310 segment_count_sit << log_blocks_per_seg);
1311 return true;
1312 }
1313
1314 if (nat_blkaddr + (segment_count_nat << log_blocks_per_seg) !=
1315 ssa_blkaddr) {
1316 f2fs_msg(sb, KERN_INFO,
1317 "Wrong NAT boundary, start(%u) end(%u) blocks(%u)",
1318 nat_blkaddr, ssa_blkaddr,
1319 segment_count_nat << log_blocks_per_seg);
1320 return true;
1321 }
1322
1323 if (ssa_blkaddr + (segment_count_ssa << log_blocks_per_seg) !=
1324 main_blkaddr) {
1325 f2fs_msg(sb, KERN_INFO,
1326 "Wrong SSA boundary, start(%u) end(%u) blocks(%u)",
1327 ssa_blkaddr, main_blkaddr,
1328 segment_count_ssa << log_blocks_per_seg);
1329 return true;
1330 }
1331
1332 if (main_end_blkaddr > seg_end_blkaddr) {
1333 f2fs_msg(sb, KERN_INFO,
1334 "Wrong MAIN_AREA boundary, start(%u) end(%u) block(%u)",
1335 main_blkaddr,
1336 segment0_blkaddr +
1337 (segment_count << log_blocks_per_seg),
1338 segment_count_main << log_blocks_per_seg);
1339 return true;
1340 } else if (main_end_blkaddr < seg_end_blkaddr) {
1341 int err = 0;
1342 char *res;
1343
1344 /* fix in-memory information all the time */
1345 raw_super->segment_count = cpu_to_le32((main_end_blkaddr -
1346 segment0_blkaddr) >> log_blocks_per_seg);
1347
1348 if (f2fs_readonly(sb) || bdev_read_only(sb->s_bdev)) {
1349 set_sbi_flag(sbi, SBI_NEED_SB_WRITE);
1350 res = "internally";
1351 } else {
1352 err = __f2fs_commit_super(bh, NULL);
1353 res = err ? "failed" : "done";
1354 }
1355 f2fs_msg(sb, KERN_INFO,
1356 "Fix alignment : %s, start(%u) end(%u) block(%u)",
1357 res, main_blkaddr,
1358 segment0_blkaddr +
1359 (segment_count << log_blocks_per_seg),
1360 segment_count_main << log_blocks_per_seg);
1361 if (err)
1362 return true;
1363 }
1364 return false;
1365 }
1366
1367 static int sanity_check_raw_super(struct f2fs_sb_info *sbi,
1368 struct buffer_head *bh)
1369 {
1370 struct f2fs_super_block *raw_super = (struct f2fs_super_block *)
1371 (bh->b_data + F2FS_SUPER_OFFSET);
1372 struct super_block *sb = sbi->sb;
1373 unsigned int blocksize;
1374
1375 if (F2FS_SUPER_MAGIC != le32_to_cpu(raw_super->magic)) {
1376 f2fs_msg(sb, KERN_INFO,
1377 "Magic Mismatch, valid(0x%x) - read(0x%x)",
1378 F2FS_SUPER_MAGIC, le32_to_cpu(raw_super->magic));
1379 return 1;
1380 }
1381
1382 /* Currently, support only 4KB page cache size */
1383 if (F2FS_BLKSIZE != PAGE_SIZE) {
1384 f2fs_msg(sb, KERN_INFO,
1385 "Invalid page_cache_size (%lu), supports only 4KB\n",
1386 PAGE_SIZE);
1387 return 1;
1388 }
1389
1390 /* Currently, support only 4KB block size */
1391 blocksize = 1 << le32_to_cpu(raw_super->log_blocksize);
1392 if (blocksize != F2FS_BLKSIZE) {
1393 f2fs_msg(sb, KERN_INFO,
1394 "Invalid blocksize (%u), supports only 4KB\n",
1395 blocksize);
1396 return 1;
1397 }
1398
1399 /* check log blocks per segment */
1400 if (le32_to_cpu(raw_super->log_blocks_per_seg) != 9) {
1401 f2fs_msg(sb, KERN_INFO,
1402 "Invalid log blocks per segment (%u)\n",
1403 le32_to_cpu(raw_super->log_blocks_per_seg));
1404 return 1;
1405 }
1406
1407 /* Currently, support 512/1024/2048/4096 bytes sector size */
1408 if (le32_to_cpu(raw_super->log_sectorsize) >
1409 F2FS_MAX_LOG_SECTOR_SIZE ||
1410 le32_to_cpu(raw_super->log_sectorsize) <
1411 F2FS_MIN_LOG_SECTOR_SIZE) {
1412 f2fs_msg(sb, KERN_INFO, "Invalid log sectorsize (%u)",
1413 le32_to_cpu(raw_super->log_sectorsize));
1414 return 1;
1415 }
1416 if (le32_to_cpu(raw_super->log_sectors_per_block) +
1417 le32_to_cpu(raw_super->log_sectorsize) !=
1418 F2FS_MAX_LOG_SECTOR_SIZE) {
1419 f2fs_msg(sb, KERN_INFO,
1420 "Invalid log sectors per block(%u) log sectorsize(%u)",
1421 le32_to_cpu(raw_super->log_sectors_per_block),
1422 le32_to_cpu(raw_super->log_sectorsize));
1423 return 1;
1424 }
1425
1426 /* check reserved ino info */
1427 if (le32_to_cpu(raw_super->node_ino) != 1 ||
1428 le32_to_cpu(raw_super->meta_ino) != 2 ||
1429 le32_to_cpu(raw_super->root_ino) != 3) {
1430 f2fs_msg(sb, KERN_INFO,
1431 "Invalid Fs Meta Ino: node(%u) meta(%u) root(%u)",
1432 le32_to_cpu(raw_super->node_ino),
1433 le32_to_cpu(raw_super->meta_ino),
1434 le32_to_cpu(raw_super->root_ino));
1435 return 1;
1436 }
1437
1438 /* check CP/SIT/NAT/SSA/MAIN_AREA area boundary */
1439 if (sanity_check_area_boundary(sbi, bh))
1440 return 1;
1441
1442 return 0;
1443 }
1444
1445 int sanity_check_ckpt(struct f2fs_sb_info *sbi)
1446 {
1447 unsigned int total, fsmeta;
1448 struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
1449 struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
1450 unsigned int ovp_segments, reserved_segments;
1451
1452 total = le32_to_cpu(raw_super->segment_count);
1453 fsmeta = le32_to_cpu(raw_super->segment_count_ckpt);
1454 fsmeta += le32_to_cpu(raw_super->segment_count_sit);
1455 fsmeta += le32_to_cpu(raw_super->segment_count_nat);
1456 fsmeta += le32_to_cpu(ckpt->rsvd_segment_count);
1457 fsmeta += le32_to_cpu(raw_super->segment_count_ssa);
1458
1459 if (unlikely(fsmeta >= total))
1460 return 1;
1461
1462 ovp_segments = le32_to_cpu(ckpt->overprov_segment_count);
1463 reserved_segments = le32_to_cpu(ckpt->rsvd_segment_count);
1464
1465 if (unlikely(fsmeta < F2FS_MIN_SEGMENTS ||
1466 ovp_segments == 0 || reserved_segments == 0)) {
1467 f2fs_msg(sbi->sb, KERN_ERR,
1468 "Wrong layout: check mkfs.f2fs version");
1469 return 1;
1470 }
1471
1472 if (unlikely(f2fs_cp_error(sbi))) {
1473 f2fs_msg(sbi->sb, KERN_ERR, "A bug case: need to run fsck");
1474 return 1;
1475 }
1476 return 0;
1477 }
1478
1479 static void init_sb_info(struct f2fs_sb_info *sbi)
1480 {
1481 struct f2fs_super_block *raw_super = sbi->raw_super;
1482 int i;
1483
1484 sbi->log_sectors_per_block =
1485 le32_to_cpu(raw_super->log_sectors_per_block);
1486 sbi->log_blocksize = le32_to_cpu(raw_super->log_blocksize);
1487 sbi->blocksize = 1 << sbi->log_blocksize;
1488 sbi->log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
1489 sbi->blocks_per_seg = 1 << sbi->log_blocks_per_seg;
1490 sbi->segs_per_sec = le32_to_cpu(raw_super->segs_per_sec);
1491 sbi->secs_per_zone = le32_to_cpu(raw_super->secs_per_zone);
1492 sbi->total_sections = le32_to_cpu(raw_super->section_count);
1493 sbi->total_node_count =
1494 (le32_to_cpu(raw_super->segment_count_nat) / 2)
1495 * sbi->blocks_per_seg * NAT_ENTRY_PER_BLOCK;
1496 sbi->root_ino_num = le32_to_cpu(raw_super->root_ino);
1497 sbi->node_ino_num = le32_to_cpu(raw_super->node_ino);
1498 sbi->meta_ino_num = le32_to_cpu(raw_super->meta_ino);
1499 sbi->cur_victim_sec = NULL_SECNO;
1500 sbi->max_victim_search = DEF_MAX_VICTIM_SEARCH;
1501
1502 sbi->dir_level = DEF_DIR_LEVEL;
1503 sbi->interval_time[CP_TIME] = DEF_CP_INTERVAL;
1504 sbi->interval_time[REQ_TIME] = DEF_IDLE_INTERVAL;
1505 clear_sbi_flag(sbi, SBI_NEED_FSCK);
1506
1507 for (i = 0; i < NR_COUNT_TYPE; i++)
1508 atomic_set(&sbi->nr_pages[i], 0);
1509
1510 INIT_LIST_HEAD(&sbi->s_list);
1511 mutex_init(&sbi->umount_mutex);
1512 mutex_init(&sbi->wio_mutex[NODE]);
1513 mutex_init(&sbi->wio_mutex[DATA]);
1514 spin_lock_init(&sbi->cp_lock);
1515 }
1516
1517 static int init_percpu_info(struct f2fs_sb_info *sbi)
1518 {
1519 int err;
1520
1521 err = percpu_counter_init(&sbi->alloc_valid_block_count, 0, GFP_KERNEL);
1522 if (err)
1523 return err;
1524
1525 return percpu_counter_init(&sbi->total_valid_inode_count, 0,
1526 GFP_KERNEL);
1527 }
1528
1529 #ifdef CONFIG_BLK_DEV_ZONED
1530 static int init_blkz_info(struct f2fs_sb_info *sbi, int devi)
1531 {
1532 struct block_device *bdev = FDEV(devi).bdev;
1533 sector_t nr_sectors = bdev->bd_part->nr_sects;
1534 sector_t sector = 0;
1535 struct blk_zone *zones;
1536 unsigned int i, nr_zones;
1537 unsigned int n = 0;
1538 int err = -EIO;
1539
1540 if (!f2fs_sb_mounted_blkzoned(sbi->sb))
1541 return 0;
1542
1543 if (sbi->blocks_per_blkz && sbi->blocks_per_blkz !=
1544 SECTOR_TO_BLOCK(bdev_zone_sectors(bdev)))
1545 return -EINVAL;
1546 sbi->blocks_per_blkz = SECTOR_TO_BLOCK(bdev_zone_sectors(bdev));
1547 if (sbi->log_blocks_per_blkz && sbi->log_blocks_per_blkz !=
1548 __ilog2_u32(sbi->blocks_per_blkz))
1549 return -EINVAL;
1550 sbi->log_blocks_per_blkz = __ilog2_u32(sbi->blocks_per_blkz);
1551 FDEV(devi).nr_blkz = SECTOR_TO_BLOCK(nr_sectors) >>
1552 sbi->log_blocks_per_blkz;
1553 if (nr_sectors & (bdev_zone_sectors(bdev) - 1))
1554 FDEV(devi).nr_blkz++;
1555
1556 FDEV(devi).blkz_type = kmalloc(FDEV(devi).nr_blkz, GFP_KERNEL);
1557 if (!FDEV(devi).blkz_type)
1558 return -ENOMEM;
1559
1560 #define F2FS_REPORT_NR_ZONES 4096
1561
1562 zones = kcalloc(F2FS_REPORT_NR_ZONES, sizeof(struct blk_zone),
1563 GFP_KERNEL);
1564 if (!zones)
1565 return -ENOMEM;
1566
1567 /* Get block zones type */
1568 while (zones && sector < nr_sectors) {
1569
1570 nr_zones = F2FS_REPORT_NR_ZONES;
1571 err = blkdev_report_zones(bdev, sector,
1572 zones, &nr_zones,
1573 GFP_KERNEL);
1574 if (err)
1575 break;
1576 if (!nr_zones) {
1577 err = -EIO;
1578 break;
1579 }
1580
1581 for (i = 0; i < nr_zones; i++) {
1582 FDEV(devi).blkz_type[n] = zones[i].type;
1583 sector += zones[i].len;
1584 n++;
1585 }
1586 }
1587
1588 kfree(zones);
1589
1590 return err;
1591 }
1592 #endif
1593
1594 /*
1595 * Read f2fs raw super block.
1596 * Because we have two copies of super block, so read both of them
1597 * to get the first valid one. If any one of them is broken, we pass
1598 * them recovery flag back to the caller.
1599 */
1600 static int read_raw_super_block(struct f2fs_sb_info *sbi,
1601 struct f2fs_super_block **raw_super,
1602 int *valid_super_block, int *recovery)
1603 {
1604 struct super_block *sb = sbi->sb;
1605 int block;
1606 struct buffer_head *bh;
1607 struct f2fs_super_block *super;
1608 int err = 0;
1609
1610 super = kzalloc(sizeof(struct f2fs_super_block), GFP_KERNEL);
1611 if (!super)
1612 return -ENOMEM;
1613
1614 for (block = 0; block < 2; block++) {
1615 bh = sb_bread(sb, block);
1616 if (!bh) {
1617 f2fs_msg(sb, KERN_ERR, "Unable to read %dth superblock",
1618 block + 1);
1619 err = -EIO;
1620 continue;
1621 }
1622
1623 /* sanity checking of raw super */
1624 if (sanity_check_raw_super(sbi, bh)) {
1625 f2fs_msg(sb, KERN_ERR,
1626 "Can't find valid F2FS filesystem in %dth superblock",
1627 block + 1);
1628 err = -EINVAL;
1629 brelse(bh);
1630 continue;
1631 }
1632
1633 if (!*raw_super) {
1634 memcpy(super, bh->b_data + F2FS_SUPER_OFFSET,
1635 sizeof(*super));
1636 *valid_super_block = block;
1637 *raw_super = super;
1638 }
1639 brelse(bh);
1640 }
1641
1642 /* Fail to read any one of the superblocks*/
1643 if (err < 0)
1644 *recovery = 1;
1645
1646 /* No valid superblock */
1647 if (!*raw_super)
1648 kfree(super);
1649 else
1650 err = 0;
1651
1652 return err;
1653 }
1654
1655 int f2fs_commit_super(struct f2fs_sb_info *sbi, bool recover)
1656 {
1657 struct buffer_head *bh;
1658 int err;
1659
1660 if ((recover && f2fs_readonly(sbi->sb)) ||
1661 bdev_read_only(sbi->sb->s_bdev)) {
1662 set_sbi_flag(sbi, SBI_NEED_SB_WRITE);
1663 return -EROFS;
1664 }
1665
1666 /* write back-up superblock first */
1667 bh = sb_getblk(sbi->sb, sbi->valid_super_block ? 0: 1);
1668 if (!bh)
1669 return -EIO;
1670 err = __f2fs_commit_super(bh, F2FS_RAW_SUPER(sbi));
1671 brelse(bh);
1672
1673 /* if we are in recovery path, skip writing valid superblock */
1674 if (recover || err)
1675 return err;
1676
1677 /* write current valid superblock */
1678 bh = sb_getblk(sbi->sb, sbi->valid_super_block);
1679 if (!bh)
1680 return -EIO;
1681 err = __f2fs_commit_super(bh, F2FS_RAW_SUPER(sbi));
1682 brelse(bh);
1683 return err;
1684 }
1685
1686 static int f2fs_scan_devices(struct f2fs_sb_info *sbi)
1687 {
1688 struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
1689 int i;
1690
1691 for (i = 0; i < MAX_DEVICES; i++) {
1692 if (!RDEV(i).path[0])
1693 return 0;
1694
1695 if (i == 0) {
1696 sbi->devs = kzalloc(sizeof(struct f2fs_dev_info) *
1697 MAX_DEVICES, GFP_KERNEL);
1698 if (!sbi->devs)
1699 return -ENOMEM;
1700 }
1701
1702 memcpy(FDEV(i).path, RDEV(i).path, MAX_PATH_LEN);
1703 FDEV(i).total_segments = le32_to_cpu(RDEV(i).total_segments);
1704 if (i == 0) {
1705 FDEV(i).start_blk = 0;
1706 FDEV(i).end_blk = FDEV(i).start_blk +
1707 (FDEV(i).total_segments <<
1708 sbi->log_blocks_per_seg) - 1 +
1709 le32_to_cpu(raw_super->segment0_blkaddr);
1710 } else {
1711 FDEV(i).start_blk = FDEV(i - 1).end_blk + 1;
1712 FDEV(i).end_blk = FDEV(i).start_blk +
1713 (FDEV(i).total_segments <<
1714 sbi->log_blocks_per_seg) - 1;
1715 }
1716
1717 FDEV(i).bdev = blkdev_get_by_path(FDEV(i).path,
1718 sbi->sb->s_mode, sbi->sb->s_type);
1719 if (IS_ERR(FDEV(i).bdev))
1720 return PTR_ERR(FDEV(i).bdev);
1721
1722 /* to release errored devices */
1723 sbi->s_ndevs = i + 1;
1724
1725 #ifdef CONFIG_BLK_DEV_ZONED
1726 if (bdev_zoned_model(FDEV(i).bdev) == BLK_ZONED_HM &&
1727 !f2fs_sb_mounted_blkzoned(sbi->sb)) {
1728 f2fs_msg(sbi->sb, KERN_ERR,
1729 "Zoned block device feature not enabled\n");
1730 return -EINVAL;
1731 }
1732 if (bdev_zoned_model(FDEV(i).bdev) != BLK_ZONED_NONE) {
1733 if (init_blkz_info(sbi, i)) {
1734 f2fs_msg(sbi->sb, KERN_ERR,
1735 "Failed to initialize F2FS blkzone information");
1736 return -EINVAL;
1737 }
1738 f2fs_msg(sbi->sb, KERN_INFO,
1739 "Mount Device [%2d]: %20s, %8u, %8x - %8x (zone: %s)",
1740 i, FDEV(i).path,
1741 FDEV(i).total_segments,
1742 FDEV(i).start_blk, FDEV(i).end_blk,
1743 bdev_zoned_model(FDEV(i).bdev) == BLK_ZONED_HA ?
1744 "Host-aware" : "Host-managed");
1745 continue;
1746 }
1747 #endif
1748 f2fs_msg(sbi->sb, KERN_INFO,
1749 "Mount Device [%2d]: %20s, %8u, %8x - %8x",
1750 i, FDEV(i).path,
1751 FDEV(i).total_segments,
1752 FDEV(i).start_blk, FDEV(i).end_blk);
1753 }
1754 return 0;
1755 }
1756
1757 static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
1758 {
1759 struct f2fs_sb_info *sbi;
1760 struct f2fs_super_block *raw_super;
1761 struct inode *root;
1762 int err;
1763 bool retry = true, need_fsck = false;
1764 char *options = NULL;
1765 int recovery, i, valid_super_block;
1766 struct curseg_info *seg_i;
1767
1768 try_onemore:
1769 err = -EINVAL;
1770 raw_super = NULL;
1771 valid_super_block = -1;
1772 recovery = 0;
1773
1774 /* allocate memory for f2fs-specific super block info */
1775 sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL);
1776 if (!sbi)
1777 return -ENOMEM;
1778
1779 sbi->sb = sb;
1780
1781 /* Load the checksum driver */
1782 sbi->s_chksum_driver = crypto_alloc_shash("crc32", 0, 0);
1783 if (IS_ERR(sbi->s_chksum_driver)) {
1784 f2fs_msg(sb, KERN_ERR, "Cannot load crc32 driver.");
1785 err = PTR_ERR(sbi->s_chksum_driver);
1786 sbi->s_chksum_driver = NULL;
1787 goto free_sbi;
1788 }
1789
1790 /* set a block size */
1791 if (unlikely(!sb_set_blocksize(sb, F2FS_BLKSIZE))) {
1792 f2fs_msg(sb, KERN_ERR, "unable to set blocksize");
1793 goto free_sbi;
1794 }
1795
1796 err = read_raw_super_block(sbi, &raw_super, &valid_super_block,
1797 &recovery);
1798 if (err)
1799 goto free_sbi;
1800
1801 sb->s_fs_info = sbi;
1802 sbi->raw_super = raw_super;
1803
1804 /*
1805 * The BLKZONED feature indicates that the drive was formatted with
1806 * zone alignment optimization. This is optional for host-aware
1807 * devices, but mandatory for host-managed zoned block devices.
1808 */
1809 #ifndef CONFIG_BLK_DEV_ZONED
1810 if (f2fs_sb_mounted_blkzoned(sb)) {
1811 f2fs_msg(sb, KERN_ERR,
1812 "Zoned block device support is not enabled\n");
1813 goto free_sb_buf;
1814 }
1815 #endif
1816 default_options(sbi);
1817 /* parse mount options */
1818 options = kstrdup((const char *)data, GFP_KERNEL);
1819 if (data && !options) {
1820 err = -ENOMEM;
1821 goto free_sb_buf;
1822 }
1823
1824 err = parse_options(sb, options);
1825 if (err)
1826 goto free_options;
1827
1828 sbi->max_file_blocks = max_file_blocks();
1829 sb->s_maxbytes = sbi->max_file_blocks <<
1830 le32_to_cpu(raw_super->log_blocksize);
1831 sb->s_max_links = F2FS_LINK_MAX;
1832 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1833
1834 sb->s_op = &f2fs_sops;
1835 sb->s_cop = &f2fs_cryptops;
1836 sb->s_xattr = f2fs_xattr_handlers;
1837 sb->s_export_op = &f2fs_export_ops;
1838 sb->s_magic = F2FS_SUPER_MAGIC;
1839 sb->s_time_gran = 1;
1840 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1841 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
1842 memcpy(sb->s_uuid, raw_super->uuid, sizeof(raw_super->uuid));
1843
1844 /* init f2fs-specific super block info */
1845 sbi->valid_super_block = valid_super_block;
1846 mutex_init(&sbi->gc_mutex);
1847 mutex_init(&sbi->cp_mutex);
1848 init_rwsem(&sbi->node_write);
1849
1850 /* disallow all the data/node/meta page writes */
1851 set_sbi_flag(sbi, SBI_POR_DOING);
1852 spin_lock_init(&sbi->stat_lock);
1853
1854 init_rwsem(&sbi->read_io.io_rwsem);
1855 sbi->read_io.sbi = sbi;
1856 sbi->read_io.bio = NULL;
1857 for (i = 0; i < NR_PAGE_TYPE; i++) {
1858 init_rwsem(&sbi->write_io[i].io_rwsem);
1859 sbi->write_io[i].sbi = sbi;
1860 sbi->write_io[i].bio = NULL;
1861 }
1862
1863 init_rwsem(&sbi->cp_rwsem);
1864 init_waitqueue_head(&sbi->cp_wait);
1865 init_sb_info(sbi);
1866
1867 err = init_percpu_info(sbi);
1868 if (err)
1869 goto free_options;
1870
1871 /* get an inode for meta space */
1872 sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi));
1873 if (IS_ERR(sbi->meta_inode)) {
1874 f2fs_msg(sb, KERN_ERR, "Failed to read F2FS meta data inode");
1875 err = PTR_ERR(sbi->meta_inode);
1876 goto free_options;
1877 }
1878
1879 err = get_valid_checkpoint(sbi);
1880 if (err) {
1881 f2fs_msg(sb, KERN_ERR, "Failed to get valid F2FS checkpoint");
1882 goto free_meta_inode;
1883 }
1884
1885 /* Initialize device list */
1886 err = f2fs_scan_devices(sbi);
1887 if (err) {
1888 f2fs_msg(sb, KERN_ERR, "Failed to find devices");
1889 goto free_devices;
1890 }
1891
1892 sbi->total_valid_node_count =
1893 le32_to_cpu(sbi->ckpt->valid_node_count);
1894 percpu_counter_set(&sbi->total_valid_inode_count,
1895 le32_to_cpu(sbi->ckpt->valid_inode_count));
1896 sbi->user_block_count = le64_to_cpu(sbi->ckpt->user_block_count);
1897 sbi->total_valid_block_count =
1898 le64_to_cpu(sbi->ckpt->valid_block_count);
1899 sbi->last_valid_block_count = sbi->total_valid_block_count;
1900
1901 for (i = 0; i < NR_INODE_TYPE; i++) {
1902 INIT_LIST_HEAD(&sbi->inode_list[i]);
1903 spin_lock_init(&sbi->inode_lock[i]);
1904 }
1905
1906 init_extent_cache_info(sbi);
1907
1908 init_ino_entry_info(sbi);
1909
1910 /* setup f2fs internal modules */
1911 err = build_segment_manager(sbi);
1912 if (err) {
1913 f2fs_msg(sb, KERN_ERR,
1914 "Failed to initialize F2FS segment manager");
1915 goto free_sm;
1916 }
1917 err = build_node_manager(sbi);
1918 if (err) {
1919 f2fs_msg(sb, KERN_ERR,
1920 "Failed to initialize F2FS node manager");
1921 goto free_nm;
1922 }
1923
1924 /* For write statistics */
1925 if (sb->s_bdev->bd_part)
1926 sbi->sectors_written_start =
1927 (u64)part_stat_read(sb->s_bdev->bd_part, sectors[1]);
1928
1929 /* Read accumulated write IO statistics if exists */
1930 seg_i = CURSEG_I(sbi, CURSEG_HOT_NODE);
1931 if (__exist_node_summaries(sbi))
1932 sbi->kbytes_written =
1933 le64_to_cpu(seg_i->journal->info.kbytes_written);
1934
1935 build_gc_manager(sbi);
1936
1937 /* get an inode for node space */
1938 sbi->node_inode = f2fs_iget(sb, F2FS_NODE_INO(sbi));
1939 if (IS_ERR(sbi->node_inode)) {
1940 f2fs_msg(sb, KERN_ERR, "Failed to read node inode");
1941 err = PTR_ERR(sbi->node_inode);
1942 goto free_nm;
1943 }
1944
1945 f2fs_join_shrinker(sbi);
1946
1947 /* if there are nt orphan nodes free them */
1948 err = recover_orphan_inodes(sbi);
1949 if (err)
1950 goto free_node_inode;
1951
1952 /* read root inode and dentry */
1953 root = f2fs_iget(sb, F2FS_ROOT_INO(sbi));
1954 if (IS_ERR(root)) {
1955 f2fs_msg(sb, KERN_ERR, "Failed to read root inode");
1956 err = PTR_ERR(root);
1957 goto free_node_inode;
1958 }
1959 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1960 iput(root);
1961 err = -EINVAL;
1962 goto free_node_inode;
1963 }
1964
1965 sb->s_root = d_make_root(root); /* allocate root dentry */
1966 if (!sb->s_root) {
1967 err = -ENOMEM;
1968 goto free_root_inode;
1969 }
1970
1971 err = f2fs_build_stats(sbi);
1972 if (err)
1973 goto free_root_inode;
1974
1975 if (f2fs_proc_root)
1976 sbi->s_proc = proc_mkdir(sb->s_id, f2fs_proc_root);
1977
1978 if (sbi->s_proc) {
1979 proc_create_data("segment_info", S_IRUGO, sbi->s_proc,
1980 &f2fs_seq_segment_info_fops, sb);
1981 proc_create_data("segment_bits", S_IRUGO, sbi->s_proc,
1982 &f2fs_seq_segment_bits_fops, sb);
1983 }
1984
1985 sbi->s_kobj.kset = f2fs_kset;
1986 init_completion(&sbi->s_kobj_unregister);
1987 err = kobject_init_and_add(&sbi->s_kobj, &f2fs_ktype, NULL,
1988 "%s", sb->s_id);
1989 if (err)
1990 goto free_proc;
1991
1992 /* recover fsynced data */
1993 if (!test_opt(sbi, DISABLE_ROLL_FORWARD)) {
1994 /*
1995 * mount should be failed, when device has readonly mode, and
1996 * previous checkpoint was not done by clean system shutdown.
1997 */
1998 if (bdev_read_only(sb->s_bdev) &&
1999 !is_set_ckpt_flags(sbi, CP_UMOUNT_FLAG)) {
2000 err = -EROFS;
2001 goto free_kobj;
2002 }
2003
2004 if (need_fsck)
2005 set_sbi_flag(sbi, SBI_NEED_FSCK);
2006
2007 if (!retry)
2008 goto skip_recovery;
2009
2010 err = recover_fsync_data(sbi, false);
2011 if (err < 0) {
2012 need_fsck = true;
2013 f2fs_msg(sb, KERN_ERR,
2014 "Cannot recover all fsync data errno=%d", err);
2015 goto free_kobj;
2016 }
2017 } else {
2018 err = recover_fsync_data(sbi, true);
2019
2020 if (!f2fs_readonly(sb) && err > 0) {
2021 err = -EINVAL;
2022 f2fs_msg(sb, KERN_ERR,
2023 "Need to recover fsync data");
2024 goto free_kobj;
2025 }
2026 }
2027 skip_recovery:
2028 /* recover_fsync_data() cleared this already */
2029 clear_sbi_flag(sbi, SBI_POR_DOING);
2030
2031 /*
2032 * If filesystem is not mounted as read-only then
2033 * do start the gc_thread.
2034 */
2035 if (test_opt(sbi, BG_GC) && !f2fs_readonly(sb)) {
2036 /* After POR, we can run background GC thread.*/
2037 err = start_gc_thread(sbi);
2038 if (err)
2039 goto free_kobj;
2040 }
2041 kfree(options);
2042
2043 /* recover broken superblock */
2044 if (recovery) {
2045 err = f2fs_commit_super(sbi, true);
2046 f2fs_msg(sb, KERN_INFO,
2047 "Try to recover %dth superblock, ret: %d",
2048 sbi->valid_super_block ? 1 : 2, err);
2049 }
2050
2051 f2fs_update_time(sbi, CP_TIME);
2052 f2fs_update_time(sbi, REQ_TIME);
2053 return 0;
2054
2055 free_kobj:
2056 f2fs_sync_inode_meta(sbi);
2057 kobject_del(&sbi->s_kobj);
2058 kobject_put(&sbi->s_kobj);
2059 wait_for_completion(&sbi->s_kobj_unregister);
2060 free_proc:
2061 if (sbi->s_proc) {
2062 remove_proc_entry("segment_info", sbi->s_proc);
2063 remove_proc_entry("segment_bits", sbi->s_proc);
2064 remove_proc_entry(sb->s_id, f2fs_proc_root);
2065 }
2066 f2fs_destroy_stats(sbi);
2067 free_root_inode:
2068 dput(sb->s_root);
2069 sb->s_root = NULL;
2070 free_node_inode:
2071 truncate_inode_pages_final(NODE_MAPPING(sbi));
2072 mutex_lock(&sbi->umount_mutex);
2073 release_ino_entry(sbi, true);
2074 f2fs_leave_shrinker(sbi);
2075 /*
2076 * Some dirty meta pages can be produced by recover_orphan_inodes()
2077 * failed by EIO. Then, iput(node_inode) can trigger balance_fs_bg()
2078 * followed by write_checkpoint() through f2fs_write_node_pages(), which
2079 * falls into an infinite loop in sync_meta_pages().
2080 */
2081 truncate_inode_pages_final(META_MAPPING(sbi));
2082 iput(sbi->node_inode);
2083 mutex_unlock(&sbi->umount_mutex);
2084 free_nm:
2085 destroy_node_manager(sbi);
2086 free_sm:
2087 destroy_segment_manager(sbi);
2088 free_devices:
2089 destroy_device_list(sbi);
2090 kfree(sbi->ckpt);
2091 free_meta_inode:
2092 make_bad_inode(sbi->meta_inode);
2093 iput(sbi->meta_inode);
2094 free_options:
2095 destroy_percpu_info(sbi);
2096 kfree(options);
2097 free_sb_buf:
2098 kfree(raw_super);
2099 free_sbi:
2100 if (sbi->s_chksum_driver)
2101 crypto_free_shash(sbi->s_chksum_driver);
2102 kfree(sbi);
2103
2104 /* give only one another chance */
2105 if (retry) {
2106 retry = false;
2107 shrink_dcache_sb(sb);
2108 goto try_onemore;
2109 }
2110 return err;
2111 }
2112
2113 static struct dentry *f2fs_mount(struct file_system_type *fs_type, int flags,
2114 const char *dev_name, void *data)
2115 {
2116 return mount_bdev(fs_type, flags, dev_name, data, f2fs_fill_super);
2117 }
2118
2119 static void kill_f2fs_super(struct super_block *sb)
2120 {
2121 if (sb->s_root)
2122 set_sbi_flag(F2FS_SB(sb), SBI_IS_CLOSE);
2123 kill_block_super(sb);
2124 }
2125
2126 static struct file_system_type f2fs_fs_type = {
2127 .owner = THIS_MODULE,
2128 .name = "f2fs",
2129 .mount = f2fs_mount,
2130 .kill_sb = kill_f2fs_super,
2131 .fs_flags = FS_REQUIRES_DEV,
2132 };
2133 MODULE_ALIAS_FS("f2fs");
2134
2135 static int __init init_inodecache(void)
2136 {
2137 f2fs_inode_cachep = kmem_cache_create("f2fs_inode_cache",
2138 sizeof(struct f2fs_inode_info), 0,
2139 SLAB_RECLAIM_ACCOUNT|SLAB_ACCOUNT, NULL);
2140 if (!f2fs_inode_cachep)
2141 return -ENOMEM;
2142 return 0;
2143 }
2144
2145 static void destroy_inodecache(void)
2146 {
2147 /*
2148 * Make sure all delayed rcu free inodes are flushed before we
2149 * destroy cache.
2150 */
2151 rcu_barrier();
2152 kmem_cache_destroy(f2fs_inode_cachep);
2153 }
2154
2155 static int __init init_f2fs_fs(void)
2156 {
2157 int err;
2158
2159 f2fs_build_trace_ios();
2160
2161 err = init_inodecache();
2162 if (err)
2163 goto fail;
2164 err = create_node_manager_caches();
2165 if (err)
2166 goto free_inodecache;
2167 err = create_segment_manager_caches();
2168 if (err)
2169 goto free_node_manager_caches;
2170 err = create_checkpoint_caches();
2171 if (err)
2172 goto free_segment_manager_caches;
2173 err = create_extent_cache();
2174 if (err)
2175 goto free_checkpoint_caches;
2176 f2fs_kset = kset_create_and_add("f2fs", NULL, fs_kobj);
2177 if (!f2fs_kset) {
2178 err = -ENOMEM;
2179 goto free_extent_cache;
2180 }
2181 err = register_shrinker(&f2fs_shrinker_info);
2182 if (err)
2183 goto free_kset;
2184
2185 err = register_filesystem(&f2fs_fs_type);
2186 if (err)
2187 goto free_shrinker;
2188 err = f2fs_create_root_stats();
2189 if (err)
2190 goto free_filesystem;
2191 f2fs_proc_root = proc_mkdir("fs/f2fs", NULL);
2192 return 0;
2193
2194 free_filesystem:
2195 unregister_filesystem(&f2fs_fs_type);
2196 free_shrinker:
2197 unregister_shrinker(&f2fs_shrinker_info);
2198 free_kset:
2199 kset_unregister(f2fs_kset);
2200 free_extent_cache:
2201 destroy_extent_cache();
2202 free_checkpoint_caches:
2203 destroy_checkpoint_caches();
2204 free_segment_manager_caches:
2205 destroy_segment_manager_caches();
2206 free_node_manager_caches:
2207 destroy_node_manager_caches();
2208 free_inodecache:
2209 destroy_inodecache();
2210 fail:
2211 return err;
2212 }
2213
2214 static void __exit exit_f2fs_fs(void)
2215 {
2216 remove_proc_entry("fs/f2fs", NULL);
2217 f2fs_destroy_root_stats();
2218 unregister_filesystem(&f2fs_fs_type);
2219 unregister_shrinker(&f2fs_shrinker_info);
2220 kset_unregister(f2fs_kset);
2221 destroy_extent_cache();
2222 destroy_checkpoint_caches();
2223 destroy_segment_manager_caches();
2224 destroy_node_manager_caches();
2225 destroy_inodecache();
2226 f2fs_destroy_trace_ios();
2227 }
2228
2229 module_init(init_f2fs_fs)
2230 module_exit(exit_f2fs_fs)
2231
2232 MODULE_AUTHOR("Samsung Electronics's Praesto Team");
2233 MODULE_DESCRIPTION("Flash Friendly File System");
2234 MODULE_LICENSE("GPL");
2235
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