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f2fs: introduce cp_control structure
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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
34 #define CREATE_TRACE_POINTS
35 #include <trace/events/f2fs.h>
36
37 static struct proc_dir_entry *f2fs_proc_root;
38 static struct kmem_cache *f2fs_inode_cachep;
39 static struct kset *f2fs_kset;
40
41 enum {
42 Opt_gc_background,
43 Opt_disable_roll_forward,
44 Opt_discard,
45 Opt_noheap,
46 Opt_user_xattr,
47 Opt_nouser_xattr,
48 Opt_acl,
49 Opt_noacl,
50 Opt_active_logs,
51 Opt_disable_ext_identify,
52 Opt_inline_xattr,
53 Opt_inline_data,
54 Opt_flush_merge,
55 Opt_nobarrier,
56 Opt_err,
57 };
58
59 static match_table_t f2fs_tokens = {
60 {Opt_gc_background, "background_gc=%s"},
61 {Opt_disable_roll_forward, "disable_roll_forward"},
62 {Opt_discard, "discard"},
63 {Opt_noheap, "no_heap"},
64 {Opt_user_xattr, "user_xattr"},
65 {Opt_nouser_xattr, "nouser_xattr"},
66 {Opt_acl, "acl"},
67 {Opt_noacl, "noacl"},
68 {Opt_active_logs, "active_logs=%u"},
69 {Opt_disable_ext_identify, "disable_ext_identify"},
70 {Opt_inline_xattr, "inline_xattr"},
71 {Opt_inline_data, "inline_data"},
72 {Opt_flush_merge, "flush_merge"},
73 {Opt_nobarrier, "nobarrier"},
74 {Opt_err, NULL},
75 };
76
77 /* Sysfs support for f2fs */
78 enum {
79 GC_THREAD, /* struct f2fs_gc_thread */
80 SM_INFO, /* struct f2fs_sm_info */
81 NM_INFO, /* struct f2fs_nm_info */
82 F2FS_SBI, /* struct f2fs_sb_info */
83 };
84
85 struct f2fs_attr {
86 struct attribute attr;
87 ssize_t (*show)(struct f2fs_attr *, struct f2fs_sb_info *, char *);
88 ssize_t (*store)(struct f2fs_attr *, struct f2fs_sb_info *,
89 const char *, size_t);
90 int struct_type;
91 int offset;
92 };
93
94 static unsigned char *__struct_ptr(struct f2fs_sb_info *sbi, int struct_type)
95 {
96 if (struct_type == GC_THREAD)
97 return (unsigned char *)sbi->gc_thread;
98 else if (struct_type == SM_INFO)
99 return (unsigned char *)SM_I(sbi);
100 else if (struct_type == NM_INFO)
101 return (unsigned char *)NM_I(sbi);
102 else if (struct_type == F2FS_SBI)
103 return (unsigned char *)sbi;
104 return NULL;
105 }
106
107 static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
108 struct f2fs_sb_info *sbi, char *buf)
109 {
110 unsigned char *ptr = NULL;
111 unsigned int *ui;
112
113 ptr = __struct_ptr(sbi, a->struct_type);
114 if (!ptr)
115 return -EINVAL;
116
117 ui = (unsigned int *)(ptr + a->offset);
118
119 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
120 }
121
122 static ssize_t f2fs_sbi_store(struct f2fs_attr *a,
123 struct f2fs_sb_info *sbi,
124 const char *buf, size_t count)
125 {
126 unsigned char *ptr;
127 unsigned long t;
128 unsigned int *ui;
129 ssize_t ret;
130
131 ptr = __struct_ptr(sbi, a->struct_type);
132 if (!ptr)
133 return -EINVAL;
134
135 ui = (unsigned int *)(ptr + a->offset);
136
137 ret = kstrtoul(skip_spaces(buf), 0, &t);
138 if (ret < 0)
139 return ret;
140 *ui = t;
141 return count;
142 }
143
144 static ssize_t f2fs_attr_show(struct kobject *kobj,
145 struct attribute *attr, char *buf)
146 {
147 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
148 s_kobj);
149 struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
150
151 return a->show ? a->show(a, sbi, buf) : 0;
152 }
153
154 static ssize_t f2fs_attr_store(struct kobject *kobj, struct attribute *attr,
155 const char *buf, size_t len)
156 {
157 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
158 s_kobj);
159 struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
160
161 return a->store ? a->store(a, sbi, buf, len) : 0;
162 }
163
164 static void f2fs_sb_release(struct kobject *kobj)
165 {
166 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
167 s_kobj);
168 complete(&sbi->s_kobj_unregister);
169 }
170
171 #define F2FS_ATTR_OFFSET(_struct_type, _name, _mode, _show, _store, _offset) \
172 static struct f2fs_attr f2fs_attr_##_name = { \
173 .attr = {.name = __stringify(_name), .mode = _mode }, \
174 .show = _show, \
175 .store = _store, \
176 .struct_type = _struct_type, \
177 .offset = _offset \
178 }
179
180 #define F2FS_RW_ATTR(struct_type, struct_name, name, elname) \
181 F2FS_ATTR_OFFSET(struct_type, name, 0644, \
182 f2fs_sbi_show, f2fs_sbi_store, \
183 offsetof(struct struct_name, elname))
184
185 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_min_sleep_time, min_sleep_time);
186 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_max_sleep_time, max_sleep_time);
187 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_no_gc_sleep_time, no_gc_sleep_time);
188 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_idle, gc_idle);
189 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, reclaim_segments, rec_prefree_segments);
190 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, max_small_discards, max_discards);
191 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, ipu_policy, ipu_policy);
192 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ipu_util, min_ipu_util);
193 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_fsync_blocks, min_fsync_blocks);
194 F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ram_thresh, ram_thresh);
195 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, max_victim_search, max_victim_search);
196 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, dir_level, dir_level);
197
198 #define ATTR_LIST(name) (&f2fs_attr_##name.attr)
199 static struct attribute *f2fs_attrs[] = {
200 ATTR_LIST(gc_min_sleep_time),
201 ATTR_LIST(gc_max_sleep_time),
202 ATTR_LIST(gc_no_gc_sleep_time),
203 ATTR_LIST(gc_idle),
204 ATTR_LIST(reclaim_segments),
205 ATTR_LIST(max_small_discards),
206 ATTR_LIST(ipu_policy),
207 ATTR_LIST(min_ipu_util),
208 ATTR_LIST(min_fsync_blocks),
209 ATTR_LIST(max_victim_search),
210 ATTR_LIST(dir_level),
211 ATTR_LIST(ram_thresh),
212 NULL,
213 };
214
215 static const struct sysfs_ops f2fs_attr_ops = {
216 .show = f2fs_attr_show,
217 .store = f2fs_attr_store,
218 };
219
220 static struct kobj_type f2fs_ktype = {
221 .default_attrs = f2fs_attrs,
222 .sysfs_ops = &f2fs_attr_ops,
223 .release = f2fs_sb_release,
224 };
225
226 void f2fs_msg(struct super_block *sb, const char *level, const char *fmt, ...)
227 {
228 struct va_format vaf;
229 va_list args;
230
231 va_start(args, fmt);
232 vaf.fmt = fmt;
233 vaf.va = &args;
234 printk("%sF2FS-fs (%s): %pV\n", level, sb->s_id, &vaf);
235 va_end(args);
236 }
237
238 static void init_once(void *foo)
239 {
240 struct f2fs_inode_info *fi = (struct f2fs_inode_info *) foo;
241
242 inode_init_once(&fi->vfs_inode);
243 }
244
245 static int parse_options(struct super_block *sb, char *options)
246 {
247 struct f2fs_sb_info *sbi = F2FS_SB(sb);
248 substring_t args[MAX_OPT_ARGS];
249 char *p, *name;
250 int arg = 0;
251
252 if (!options)
253 return 0;
254
255 while ((p = strsep(&options, ",")) != NULL) {
256 int token;
257 if (!*p)
258 continue;
259 /*
260 * Initialize args struct so we know whether arg was
261 * found; some options take optional arguments.
262 */
263 args[0].to = args[0].from = NULL;
264 token = match_token(p, f2fs_tokens, args);
265
266 switch (token) {
267 case Opt_gc_background:
268 name = match_strdup(&args[0]);
269
270 if (!name)
271 return -ENOMEM;
272 if (strlen(name) == 2 && !strncmp(name, "on", 2))
273 set_opt(sbi, BG_GC);
274 else if (strlen(name) == 3 && !strncmp(name, "off", 3))
275 clear_opt(sbi, BG_GC);
276 else {
277 kfree(name);
278 return -EINVAL;
279 }
280 kfree(name);
281 break;
282 case Opt_disable_roll_forward:
283 set_opt(sbi, DISABLE_ROLL_FORWARD);
284 break;
285 case Opt_discard:
286 set_opt(sbi, DISCARD);
287 break;
288 case Opt_noheap:
289 set_opt(sbi, NOHEAP);
290 break;
291 #ifdef CONFIG_F2FS_FS_XATTR
292 case Opt_user_xattr:
293 set_opt(sbi, XATTR_USER);
294 break;
295 case Opt_nouser_xattr:
296 clear_opt(sbi, XATTR_USER);
297 break;
298 case Opt_inline_xattr:
299 set_opt(sbi, INLINE_XATTR);
300 break;
301 #else
302 case Opt_user_xattr:
303 f2fs_msg(sb, KERN_INFO,
304 "user_xattr options not supported");
305 break;
306 case Opt_nouser_xattr:
307 f2fs_msg(sb, KERN_INFO,
308 "nouser_xattr options not supported");
309 break;
310 case Opt_inline_xattr:
311 f2fs_msg(sb, KERN_INFO,
312 "inline_xattr options not supported");
313 break;
314 #endif
315 #ifdef CONFIG_F2FS_FS_POSIX_ACL
316 case Opt_acl:
317 set_opt(sbi, POSIX_ACL);
318 break;
319 case Opt_noacl:
320 clear_opt(sbi, POSIX_ACL);
321 break;
322 #else
323 case Opt_acl:
324 f2fs_msg(sb, KERN_INFO, "acl options not supported");
325 break;
326 case Opt_noacl:
327 f2fs_msg(sb, KERN_INFO, "noacl options not supported");
328 break;
329 #endif
330 case Opt_active_logs:
331 if (args->from && match_int(args, &arg))
332 return -EINVAL;
333 if (arg != 2 && arg != 4 && arg != NR_CURSEG_TYPE)
334 return -EINVAL;
335 sbi->active_logs = arg;
336 break;
337 case Opt_disable_ext_identify:
338 set_opt(sbi, DISABLE_EXT_IDENTIFY);
339 break;
340 case Opt_inline_data:
341 set_opt(sbi, INLINE_DATA);
342 break;
343 case Opt_flush_merge:
344 set_opt(sbi, FLUSH_MERGE);
345 break;
346 case Opt_nobarrier:
347 set_opt(sbi, NOBARRIER);
348 break;
349 default:
350 f2fs_msg(sb, KERN_ERR,
351 "Unrecognized mount option \"%s\" or missing value",
352 p);
353 return -EINVAL;
354 }
355 }
356 return 0;
357 }
358
359 static struct inode *f2fs_alloc_inode(struct super_block *sb)
360 {
361 struct f2fs_inode_info *fi;
362
363 fi = kmem_cache_alloc(f2fs_inode_cachep, GFP_F2FS_ZERO);
364 if (!fi)
365 return NULL;
366
367 init_once((void *) fi);
368
369 /* Initialize f2fs-specific inode info */
370 fi->vfs_inode.i_version = 1;
371 atomic_set(&fi->dirty_pages, 0);
372 fi->i_current_depth = 1;
373 fi->i_advise = 0;
374 rwlock_init(&fi->ext.ext_lock);
375 init_rwsem(&fi->i_sem);
376
377 set_inode_flag(fi, FI_NEW_INODE);
378
379 if (test_opt(F2FS_SB(sb), INLINE_XATTR))
380 set_inode_flag(fi, FI_INLINE_XATTR);
381
382 /* Will be used by directory only */
383 fi->i_dir_level = F2FS_SB(sb)->dir_level;
384
385 return &fi->vfs_inode;
386 }
387
388 static int f2fs_drop_inode(struct inode *inode)
389 {
390 /*
391 * This is to avoid a deadlock condition like below.
392 * writeback_single_inode(inode)
393 * - f2fs_write_data_page
394 * - f2fs_gc -> iput -> evict
395 * - inode_wait_for_writeback(inode)
396 */
397 if (!inode_unhashed(inode) && inode->i_state & I_SYNC)
398 return 0;
399 return generic_drop_inode(inode);
400 }
401
402 /*
403 * f2fs_dirty_inode() is called from __mark_inode_dirty()
404 *
405 * We should call set_dirty_inode to write the dirty inode through write_inode.
406 */
407 static void f2fs_dirty_inode(struct inode *inode, int flags)
408 {
409 set_inode_flag(F2FS_I(inode), FI_DIRTY_INODE);
410 }
411
412 static void f2fs_i_callback(struct rcu_head *head)
413 {
414 struct inode *inode = container_of(head, struct inode, i_rcu);
415 kmem_cache_free(f2fs_inode_cachep, F2FS_I(inode));
416 }
417
418 static void f2fs_destroy_inode(struct inode *inode)
419 {
420 call_rcu(&inode->i_rcu, f2fs_i_callback);
421 }
422
423 static void f2fs_put_super(struct super_block *sb)
424 {
425 struct f2fs_sb_info *sbi = F2FS_SB(sb);
426
427 if (sbi->s_proc) {
428 remove_proc_entry("segment_info", sbi->s_proc);
429 remove_proc_entry(sb->s_id, f2fs_proc_root);
430 }
431 kobject_del(&sbi->s_kobj);
432
433 f2fs_destroy_stats(sbi);
434 stop_gc_thread(sbi);
435
436 /* We don't need to do checkpoint when it's clean */
437 if (sbi->s_dirty) {
438 struct cp_control cpc = {
439 .reason = CP_UMOUNT,
440 };
441 write_checkpoint(sbi, &cpc);
442 }
443
444 /*
445 * normally superblock is clean, so we need to release this.
446 * In addition, EIO will skip do checkpoint, we need this as well.
447 */
448 release_dirty_inode(sbi);
449
450 iput(sbi->node_inode);
451 iput(sbi->meta_inode);
452
453 /* destroy f2fs internal modules */
454 destroy_node_manager(sbi);
455 destroy_segment_manager(sbi);
456
457 kfree(sbi->ckpt);
458 kobject_put(&sbi->s_kobj);
459 wait_for_completion(&sbi->s_kobj_unregister);
460
461 sb->s_fs_info = NULL;
462 brelse(sbi->raw_super_buf);
463 kfree(sbi);
464 }
465
466 int f2fs_sync_fs(struct super_block *sb, int sync)
467 {
468 struct f2fs_sb_info *sbi = F2FS_SB(sb);
469
470 trace_f2fs_sync_fs(sb, sync);
471
472 if (sync) {
473 struct cp_control cpc = {
474 .reason = CP_SYNC,
475 };
476 mutex_lock(&sbi->gc_mutex);
477 write_checkpoint(sbi, &cpc);
478 mutex_unlock(&sbi->gc_mutex);
479 } else {
480 f2fs_balance_fs(sbi);
481 }
482
483 return 0;
484 }
485
486 static int f2fs_freeze(struct super_block *sb)
487 {
488 int err;
489
490 if (f2fs_readonly(sb))
491 return 0;
492
493 err = f2fs_sync_fs(sb, 1);
494 return err;
495 }
496
497 static int f2fs_unfreeze(struct super_block *sb)
498 {
499 return 0;
500 }
501
502 static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf)
503 {
504 struct super_block *sb = dentry->d_sb;
505 struct f2fs_sb_info *sbi = F2FS_SB(sb);
506 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
507 block_t total_count, user_block_count, start_count, ovp_count;
508
509 total_count = le64_to_cpu(sbi->raw_super->block_count);
510 user_block_count = sbi->user_block_count;
511 start_count = le32_to_cpu(sbi->raw_super->segment0_blkaddr);
512 ovp_count = SM_I(sbi)->ovp_segments << sbi->log_blocks_per_seg;
513 buf->f_type = F2FS_SUPER_MAGIC;
514 buf->f_bsize = sbi->blocksize;
515
516 buf->f_blocks = total_count - start_count;
517 buf->f_bfree = buf->f_blocks - valid_user_blocks(sbi) - ovp_count;
518 buf->f_bavail = user_block_count - valid_user_blocks(sbi);
519
520 buf->f_files = sbi->total_node_count - F2FS_RESERVED_NODE_NUM;
521 buf->f_ffree = buf->f_files - valid_inode_count(sbi);
522
523 buf->f_namelen = F2FS_NAME_LEN;
524 buf->f_fsid.val[0] = (u32)id;
525 buf->f_fsid.val[1] = (u32)(id >> 32);
526
527 return 0;
528 }
529
530 static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
531 {
532 struct f2fs_sb_info *sbi = F2FS_SB(root->d_sb);
533
534 if (!f2fs_readonly(sbi->sb) && test_opt(sbi, BG_GC))
535 seq_printf(seq, ",background_gc=%s", "on");
536 else
537 seq_printf(seq, ",background_gc=%s", "off");
538 if (test_opt(sbi, DISABLE_ROLL_FORWARD))
539 seq_puts(seq, ",disable_roll_forward");
540 if (test_opt(sbi, DISCARD))
541 seq_puts(seq, ",discard");
542 if (test_opt(sbi, NOHEAP))
543 seq_puts(seq, ",no_heap_alloc");
544 #ifdef CONFIG_F2FS_FS_XATTR
545 if (test_opt(sbi, XATTR_USER))
546 seq_puts(seq, ",user_xattr");
547 else
548 seq_puts(seq, ",nouser_xattr");
549 if (test_opt(sbi, INLINE_XATTR))
550 seq_puts(seq, ",inline_xattr");
551 #endif
552 #ifdef CONFIG_F2FS_FS_POSIX_ACL
553 if (test_opt(sbi, POSIX_ACL))
554 seq_puts(seq, ",acl");
555 else
556 seq_puts(seq, ",noacl");
557 #endif
558 if (test_opt(sbi, DISABLE_EXT_IDENTIFY))
559 seq_puts(seq, ",disable_ext_identify");
560 if (test_opt(sbi, INLINE_DATA))
561 seq_puts(seq, ",inline_data");
562 if (!f2fs_readonly(sbi->sb) && test_opt(sbi, FLUSH_MERGE))
563 seq_puts(seq, ",flush_merge");
564 if (test_opt(sbi, NOBARRIER))
565 seq_puts(seq, ",nobarrier");
566 seq_printf(seq, ",active_logs=%u", sbi->active_logs);
567
568 return 0;
569 }
570
571 static int segment_info_seq_show(struct seq_file *seq, void *offset)
572 {
573 struct super_block *sb = seq->private;
574 struct f2fs_sb_info *sbi = F2FS_SB(sb);
575 unsigned int total_segs =
576 le32_to_cpu(sbi->raw_super->segment_count_main);
577 int i;
578
579 seq_puts(seq, "format: segment_type|valid_blocks\n"
580 "segment_type(0:HD, 1:WD, 2:CD, 3:HN, 4:WN, 5:CN)\n");
581
582 for (i = 0; i < total_segs; i++) {
583 struct seg_entry *se = get_seg_entry(sbi, i);
584
585 if ((i % 10) == 0)
586 seq_printf(seq, "%-5d", i);
587 seq_printf(seq, "%d|%-3u", se->type,
588 get_valid_blocks(sbi, i, 1));
589 if ((i % 10) == 9 || i == (total_segs - 1))
590 seq_putc(seq, '\n');
591 else
592 seq_putc(seq, ' ');
593 }
594
595 return 0;
596 }
597
598 static int segment_info_open_fs(struct inode *inode, struct file *file)
599 {
600 return single_open(file, segment_info_seq_show, PDE_DATA(inode));
601 }
602
603 static const struct file_operations f2fs_seq_segment_info_fops = {
604 .owner = THIS_MODULE,
605 .open = segment_info_open_fs,
606 .read = seq_read,
607 .llseek = seq_lseek,
608 .release = single_release,
609 };
610
611 static int f2fs_remount(struct super_block *sb, int *flags, char *data)
612 {
613 struct f2fs_sb_info *sbi = F2FS_SB(sb);
614 struct f2fs_mount_info org_mount_opt;
615 int err, active_logs;
616 bool need_restart_gc = false;
617 bool need_stop_gc = false;
618
619 sync_filesystem(sb);
620
621 /*
622 * Save the old mount options in case we
623 * need to restore them.
624 */
625 org_mount_opt = sbi->mount_opt;
626 active_logs = sbi->active_logs;
627
628 sbi->mount_opt.opt = 0;
629 sbi->active_logs = NR_CURSEG_TYPE;
630
631 /* parse mount options */
632 err = parse_options(sb, data);
633 if (err)
634 goto restore_opts;
635
636 /*
637 * Previous and new state of filesystem is RO,
638 * so skip checking GC and FLUSH_MERGE conditions.
639 */
640 if (f2fs_readonly(sb) && (*flags & MS_RDONLY))
641 goto skip;
642
643 /*
644 * We stop the GC thread if FS is mounted as RO
645 * or if background_gc = off is passed in mount
646 * option. Also sync the filesystem.
647 */
648 if ((*flags & MS_RDONLY) || !test_opt(sbi, BG_GC)) {
649 if (sbi->gc_thread) {
650 stop_gc_thread(sbi);
651 f2fs_sync_fs(sb, 1);
652 need_restart_gc = true;
653 }
654 } else if (test_opt(sbi, BG_GC) && !sbi->gc_thread) {
655 err = start_gc_thread(sbi);
656 if (err)
657 goto restore_opts;
658 need_stop_gc = true;
659 }
660
661 /*
662 * We stop issue flush thread if FS is mounted as RO
663 * or if flush_merge is not passed in mount option.
664 */
665 if ((*flags & MS_RDONLY) || !test_opt(sbi, FLUSH_MERGE)) {
666 destroy_flush_cmd_control(sbi);
667 } else if (test_opt(sbi, FLUSH_MERGE) && !SM_I(sbi)->cmd_control_info) {
668 err = create_flush_cmd_control(sbi);
669 if (err)
670 goto restore_gc;
671 }
672 skip:
673 /* Update the POSIXACL Flag */
674 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
675 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
676 return 0;
677 restore_gc:
678 if (need_restart_gc) {
679 if (start_gc_thread(sbi))
680 f2fs_msg(sbi->sb, KERN_WARNING,
681 "background gc thread has stopped");
682 } else if (need_stop_gc) {
683 stop_gc_thread(sbi);
684 }
685 restore_opts:
686 sbi->mount_opt = org_mount_opt;
687 sbi->active_logs = active_logs;
688 return err;
689 }
690
691 static struct super_operations f2fs_sops = {
692 .alloc_inode = f2fs_alloc_inode,
693 .drop_inode = f2fs_drop_inode,
694 .destroy_inode = f2fs_destroy_inode,
695 .write_inode = f2fs_write_inode,
696 .dirty_inode = f2fs_dirty_inode,
697 .show_options = f2fs_show_options,
698 .evict_inode = f2fs_evict_inode,
699 .put_super = f2fs_put_super,
700 .sync_fs = f2fs_sync_fs,
701 .freeze_fs = f2fs_freeze,
702 .unfreeze_fs = f2fs_unfreeze,
703 .statfs = f2fs_statfs,
704 .remount_fs = f2fs_remount,
705 };
706
707 static struct inode *f2fs_nfs_get_inode(struct super_block *sb,
708 u64 ino, u32 generation)
709 {
710 struct f2fs_sb_info *sbi = F2FS_SB(sb);
711 struct inode *inode;
712
713 if (check_nid_range(sbi, ino))
714 return ERR_PTR(-ESTALE);
715
716 /*
717 * f2fs_iget isn't quite right if the inode is currently unallocated!
718 * However f2fs_iget currently does appropriate checks to handle stale
719 * inodes so everything is OK.
720 */
721 inode = f2fs_iget(sb, ino);
722 if (IS_ERR(inode))
723 return ERR_CAST(inode);
724 if (unlikely(generation && inode->i_generation != generation)) {
725 /* we didn't find the right inode.. */
726 iput(inode);
727 return ERR_PTR(-ESTALE);
728 }
729 return inode;
730 }
731
732 static struct dentry *f2fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
733 int fh_len, int fh_type)
734 {
735 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
736 f2fs_nfs_get_inode);
737 }
738
739 static struct dentry *f2fs_fh_to_parent(struct super_block *sb, struct fid *fid,
740 int fh_len, int fh_type)
741 {
742 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
743 f2fs_nfs_get_inode);
744 }
745
746 static const struct export_operations f2fs_export_ops = {
747 .fh_to_dentry = f2fs_fh_to_dentry,
748 .fh_to_parent = f2fs_fh_to_parent,
749 .get_parent = f2fs_get_parent,
750 };
751
752 static loff_t max_file_size(unsigned bits)
753 {
754 loff_t result = (DEF_ADDRS_PER_INODE - F2FS_INLINE_XATTR_ADDRS);
755 loff_t leaf_count = ADDRS_PER_BLOCK;
756
757 /* two direct node blocks */
758 result += (leaf_count * 2);
759
760 /* two indirect node blocks */
761 leaf_count *= NIDS_PER_BLOCK;
762 result += (leaf_count * 2);
763
764 /* one double indirect node block */
765 leaf_count *= NIDS_PER_BLOCK;
766 result += leaf_count;
767
768 result <<= bits;
769 return result;
770 }
771
772 static int sanity_check_raw_super(struct super_block *sb,
773 struct f2fs_super_block *raw_super)
774 {
775 unsigned int blocksize;
776
777 if (F2FS_SUPER_MAGIC != le32_to_cpu(raw_super->magic)) {
778 f2fs_msg(sb, KERN_INFO,
779 "Magic Mismatch, valid(0x%x) - read(0x%x)",
780 F2FS_SUPER_MAGIC, le32_to_cpu(raw_super->magic));
781 return 1;
782 }
783
784 /* Currently, support only 4KB page cache size */
785 if (F2FS_BLKSIZE != PAGE_CACHE_SIZE) {
786 f2fs_msg(sb, KERN_INFO,
787 "Invalid page_cache_size (%lu), supports only 4KB\n",
788 PAGE_CACHE_SIZE);
789 return 1;
790 }
791
792 /* Currently, support only 4KB block size */
793 blocksize = 1 << le32_to_cpu(raw_super->log_blocksize);
794 if (blocksize != F2FS_BLKSIZE) {
795 f2fs_msg(sb, KERN_INFO,
796 "Invalid blocksize (%u), supports only 4KB\n",
797 blocksize);
798 return 1;
799 }
800
801 /* Currently, support 512/1024/2048/4096 bytes sector size */
802 if (le32_to_cpu(raw_super->log_sectorsize) >
803 F2FS_MAX_LOG_SECTOR_SIZE ||
804 le32_to_cpu(raw_super->log_sectorsize) <
805 F2FS_MIN_LOG_SECTOR_SIZE) {
806 f2fs_msg(sb, KERN_INFO, "Invalid log sectorsize (%u)",
807 le32_to_cpu(raw_super->log_sectorsize));
808 return 1;
809 }
810 if (le32_to_cpu(raw_super->log_sectors_per_block) +
811 le32_to_cpu(raw_super->log_sectorsize) !=
812 F2FS_MAX_LOG_SECTOR_SIZE) {
813 f2fs_msg(sb, KERN_INFO,
814 "Invalid log sectors per block(%u) log sectorsize(%u)",
815 le32_to_cpu(raw_super->log_sectors_per_block),
816 le32_to_cpu(raw_super->log_sectorsize));
817 return 1;
818 }
819 return 0;
820 }
821
822 static int sanity_check_ckpt(struct f2fs_sb_info *sbi)
823 {
824 unsigned int total, fsmeta;
825 struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
826 struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
827
828 total = le32_to_cpu(raw_super->segment_count);
829 fsmeta = le32_to_cpu(raw_super->segment_count_ckpt);
830 fsmeta += le32_to_cpu(raw_super->segment_count_sit);
831 fsmeta += le32_to_cpu(raw_super->segment_count_nat);
832 fsmeta += le32_to_cpu(ckpt->rsvd_segment_count);
833 fsmeta += le32_to_cpu(raw_super->segment_count_ssa);
834
835 if (unlikely(fsmeta >= total))
836 return 1;
837
838 if (unlikely(f2fs_cp_error(sbi))) {
839 f2fs_msg(sbi->sb, KERN_ERR, "A bug case: need to run fsck");
840 return 1;
841 }
842 return 0;
843 }
844
845 static void init_sb_info(struct f2fs_sb_info *sbi)
846 {
847 struct f2fs_super_block *raw_super = sbi->raw_super;
848 int i;
849
850 sbi->log_sectors_per_block =
851 le32_to_cpu(raw_super->log_sectors_per_block);
852 sbi->log_blocksize = le32_to_cpu(raw_super->log_blocksize);
853 sbi->blocksize = 1 << sbi->log_blocksize;
854 sbi->log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
855 sbi->blocks_per_seg = 1 << sbi->log_blocks_per_seg;
856 sbi->segs_per_sec = le32_to_cpu(raw_super->segs_per_sec);
857 sbi->secs_per_zone = le32_to_cpu(raw_super->secs_per_zone);
858 sbi->total_sections = le32_to_cpu(raw_super->section_count);
859 sbi->total_node_count =
860 (le32_to_cpu(raw_super->segment_count_nat) / 2)
861 * sbi->blocks_per_seg * NAT_ENTRY_PER_BLOCK;
862 sbi->root_ino_num = le32_to_cpu(raw_super->root_ino);
863 sbi->node_ino_num = le32_to_cpu(raw_super->node_ino);
864 sbi->meta_ino_num = le32_to_cpu(raw_super->meta_ino);
865 sbi->cur_victim_sec = NULL_SECNO;
866 sbi->max_victim_search = DEF_MAX_VICTIM_SEARCH;
867
868 for (i = 0; i < NR_COUNT_TYPE; i++)
869 atomic_set(&sbi->nr_pages[i], 0);
870
871 sbi->dir_level = DEF_DIR_LEVEL;
872 sbi->need_fsck = false;
873 }
874
875 /*
876 * Read f2fs raw super block.
877 * Because we have two copies of super block, so read the first one at first,
878 * if the first one is invalid, move to read the second one.
879 */
880 static int read_raw_super_block(struct super_block *sb,
881 struct f2fs_super_block **raw_super,
882 struct buffer_head **raw_super_buf)
883 {
884 int block = 0;
885
886 retry:
887 *raw_super_buf = sb_bread(sb, block);
888 if (!*raw_super_buf) {
889 f2fs_msg(sb, KERN_ERR, "Unable to read %dth superblock",
890 block + 1);
891 if (block == 0) {
892 block++;
893 goto retry;
894 } else {
895 return -EIO;
896 }
897 }
898
899 *raw_super = (struct f2fs_super_block *)
900 ((char *)(*raw_super_buf)->b_data + F2FS_SUPER_OFFSET);
901
902 /* sanity checking of raw super */
903 if (sanity_check_raw_super(sb, *raw_super)) {
904 brelse(*raw_super_buf);
905 f2fs_msg(sb, KERN_ERR,
906 "Can't find valid F2FS filesystem in %dth superblock",
907 block + 1);
908 if (block == 0) {
909 block++;
910 goto retry;
911 } else {
912 return -EINVAL;
913 }
914 }
915
916 return 0;
917 }
918
919 static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
920 {
921 struct f2fs_sb_info *sbi;
922 struct f2fs_super_block *raw_super;
923 struct buffer_head *raw_super_buf;
924 struct inode *root;
925 long err = -EINVAL;
926 bool retry = true;
927 int i;
928
929 try_onemore:
930 /* allocate memory for f2fs-specific super block info */
931 sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL);
932 if (!sbi)
933 return -ENOMEM;
934
935 /* set a block size */
936 if (unlikely(!sb_set_blocksize(sb, F2FS_BLKSIZE))) {
937 f2fs_msg(sb, KERN_ERR, "unable to set blocksize");
938 goto free_sbi;
939 }
940
941 err = read_raw_super_block(sb, &raw_super, &raw_super_buf);
942 if (err)
943 goto free_sbi;
944
945 sb->s_fs_info = sbi;
946 /* init some FS parameters */
947 sbi->active_logs = NR_CURSEG_TYPE;
948
949 set_opt(sbi, BG_GC);
950
951 #ifdef CONFIG_F2FS_FS_XATTR
952 set_opt(sbi, XATTR_USER);
953 #endif
954 #ifdef CONFIG_F2FS_FS_POSIX_ACL
955 set_opt(sbi, POSIX_ACL);
956 #endif
957 /* parse mount options */
958 err = parse_options(sb, (char *)data);
959 if (err)
960 goto free_sb_buf;
961
962 sb->s_maxbytes = max_file_size(le32_to_cpu(raw_super->log_blocksize));
963 sb->s_max_links = F2FS_LINK_MAX;
964 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
965
966 sb->s_op = &f2fs_sops;
967 sb->s_xattr = f2fs_xattr_handlers;
968 sb->s_export_op = &f2fs_export_ops;
969 sb->s_magic = F2FS_SUPER_MAGIC;
970 sb->s_time_gran = 1;
971 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
972 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
973 memcpy(sb->s_uuid, raw_super->uuid, sizeof(raw_super->uuid));
974
975 /* init f2fs-specific super block info */
976 sbi->sb = sb;
977 sbi->raw_super = raw_super;
978 sbi->raw_super_buf = raw_super_buf;
979 mutex_init(&sbi->gc_mutex);
980 mutex_init(&sbi->writepages);
981 mutex_init(&sbi->cp_mutex);
982 init_rwsem(&sbi->node_write);
983 sbi->por_doing = false;
984 spin_lock_init(&sbi->stat_lock);
985
986 init_rwsem(&sbi->read_io.io_rwsem);
987 sbi->read_io.sbi = sbi;
988 sbi->read_io.bio = NULL;
989 for (i = 0; i < NR_PAGE_TYPE; i++) {
990 init_rwsem(&sbi->write_io[i].io_rwsem);
991 sbi->write_io[i].sbi = sbi;
992 sbi->write_io[i].bio = NULL;
993 }
994
995 init_rwsem(&sbi->cp_rwsem);
996 init_waitqueue_head(&sbi->cp_wait);
997 init_sb_info(sbi);
998
999 /* get an inode for meta space */
1000 sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi));
1001 if (IS_ERR(sbi->meta_inode)) {
1002 f2fs_msg(sb, KERN_ERR, "Failed to read F2FS meta data inode");
1003 err = PTR_ERR(sbi->meta_inode);
1004 goto free_sb_buf;
1005 }
1006
1007 err = get_valid_checkpoint(sbi);
1008 if (err) {
1009 f2fs_msg(sb, KERN_ERR, "Failed to get valid F2FS checkpoint");
1010 goto free_meta_inode;
1011 }
1012
1013 /* sanity checking of checkpoint */
1014 err = -EINVAL;
1015 if (sanity_check_ckpt(sbi)) {
1016 f2fs_msg(sb, KERN_ERR, "Invalid F2FS checkpoint");
1017 goto free_cp;
1018 }
1019
1020 sbi->total_valid_node_count =
1021 le32_to_cpu(sbi->ckpt->valid_node_count);
1022 sbi->total_valid_inode_count =
1023 le32_to_cpu(sbi->ckpt->valid_inode_count);
1024 sbi->user_block_count = le64_to_cpu(sbi->ckpt->user_block_count);
1025 sbi->total_valid_block_count =
1026 le64_to_cpu(sbi->ckpt->valid_block_count);
1027 sbi->last_valid_block_count = sbi->total_valid_block_count;
1028 sbi->alloc_valid_block_count = 0;
1029 INIT_LIST_HEAD(&sbi->dir_inode_list);
1030 spin_lock_init(&sbi->dir_inode_lock);
1031
1032 init_ino_entry_info(sbi);
1033
1034 /* setup f2fs internal modules */
1035 err = build_segment_manager(sbi);
1036 if (err) {
1037 f2fs_msg(sb, KERN_ERR,
1038 "Failed to initialize F2FS segment manager");
1039 goto free_sm;
1040 }
1041 err = build_node_manager(sbi);
1042 if (err) {
1043 f2fs_msg(sb, KERN_ERR,
1044 "Failed to initialize F2FS node manager");
1045 goto free_nm;
1046 }
1047
1048 build_gc_manager(sbi);
1049
1050 /* get an inode for node space */
1051 sbi->node_inode = f2fs_iget(sb, F2FS_NODE_INO(sbi));
1052 if (IS_ERR(sbi->node_inode)) {
1053 f2fs_msg(sb, KERN_ERR, "Failed to read node inode");
1054 err = PTR_ERR(sbi->node_inode);
1055 goto free_nm;
1056 }
1057
1058 /* if there are nt orphan nodes free them */
1059 recover_orphan_inodes(sbi);
1060
1061 /* read root inode and dentry */
1062 root = f2fs_iget(sb, F2FS_ROOT_INO(sbi));
1063 if (IS_ERR(root)) {
1064 f2fs_msg(sb, KERN_ERR, "Failed to read root inode");
1065 err = PTR_ERR(root);
1066 goto free_node_inode;
1067 }
1068 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1069 iput(root);
1070 err = -EINVAL;
1071 goto free_node_inode;
1072 }
1073
1074 sb->s_root = d_make_root(root); /* allocate root dentry */
1075 if (!sb->s_root) {
1076 err = -ENOMEM;
1077 goto free_root_inode;
1078 }
1079
1080 err = f2fs_build_stats(sbi);
1081 if (err)
1082 goto free_root_inode;
1083
1084 if (f2fs_proc_root)
1085 sbi->s_proc = proc_mkdir(sb->s_id, f2fs_proc_root);
1086
1087 if (sbi->s_proc)
1088 proc_create_data("segment_info", S_IRUGO, sbi->s_proc,
1089 &f2fs_seq_segment_info_fops, sb);
1090
1091 if (test_opt(sbi, DISCARD)) {
1092 struct request_queue *q = bdev_get_queue(sb->s_bdev);
1093 if (!blk_queue_discard(q))
1094 f2fs_msg(sb, KERN_WARNING,
1095 "mounting with \"discard\" option, but "
1096 "the device does not support discard");
1097 }
1098
1099 sbi->s_kobj.kset = f2fs_kset;
1100 init_completion(&sbi->s_kobj_unregister);
1101 err = kobject_init_and_add(&sbi->s_kobj, &f2fs_ktype, NULL,
1102 "%s", sb->s_id);
1103 if (err)
1104 goto free_proc;
1105
1106 if (!retry)
1107 sbi->need_fsck = true;
1108
1109 /* recover fsynced data */
1110 if (!test_opt(sbi, DISABLE_ROLL_FORWARD)) {
1111 err = recover_fsync_data(sbi);
1112 if (err) {
1113 f2fs_msg(sb, KERN_ERR,
1114 "Cannot recover all fsync data errno=%ld", err);
1115 goto free_kobj;
1116 }
1117 }
1118
1119 /*
1120 * If filesystem is not mounted as read-only then
1121 * do start the gc_thread.
1122 */
1123 if (!f2fs_readonly(sb)) {
1124 /* After POR, we can run background GC thread.*/
1125 err = start_gc_thread(sbi);
1126 if (err)
1127 goto free_kobj;
1128 }
1129 return 0;
1130
1131 free_kobj:
1132 kobject_del(&sbi->s_kobj);
1133 free_proc:
1134 if (sbi->s_proc) {
1135 remove_proc_entry("segment_info", sbi->s_proc);
1136 remove_proc_entry(sb->s_id, f2fs_proc_root);
1137 }
1138 f2fs_destroy_stats(sbi);
1139 free_root_inode:
1140 dput(sb->s_root);
1141 sb->s_root = NULL;
1142 free_node_inode:
1143 iput(sbi->node_inode);
1144 free_nm:
1145 destroy_node_manager(sbi);
1146 free_sm:
1147 destroy_segment_manager(sbi);
1148 free_cp:
1149 kfree(sbi->ckpt);
1150 free_meta_inode:
1151 make_bad_inode(sbi->meta_inode);
1152 iput(sbi->meta_inode);
1153 free_sb_buf:
1154 brelse(raw_super_buf);
1155 free_sbi:
1156 kfree(sbi);
1157
1158 /* give only one another chance */
1159 if (retry) {
1160 retry = 0;
1161 shrink_dcache_sb(sb);
1162 goto try_onemore;
1163 }
1164 return err;
1165 }
1166
1167 static struct dentry *f2fs_mount(struct file_system_type *fs_type, int flags,
1168 const char *dev_name, void *data)
1169 {
1170 return mount_bdev(fs_type, flags, dev_name, data, f2fs_fill_super);
1171 }
1172
1173 static struct file_system_type f2fs_fs_type = {
1174 .owner = THIS_MODULE,
1175 .name = "f2fs",
1176 .mount = f2fs_mount,
1177 .kill_sb = kill_block_super,
1178 .fs_flags = FS_REQUIRES_DEV,
1179 };
1180 MODULE_ALIAS_FS("f2fs");
1181
1182 static int __init init_inodecache(void)
1183 {
1184 f2fs_inode_cachep = f2fs_kmem_cache_create("f2fs_inode_cache",
1185 sizeof(struct f2fs_inode_info));
1186 if (!f2fs_inode_cachep)
1187 return -ENOMEM;
1188 return 0;
1189 }
1190
1191 static void destroy_inodecache(void)
1192 {
1193 /*
1194 * Make sure all delayed rcu free inodes are flushed before we
1195 * destroy cache.
1196 */
1197 rcu_barrier();
1198 kmem_cache_destroy(f2fs_inode_cachep);
1199 }
1200
1201 static int __init init_f2fs_fs(void)
1202 {
1203 int err;
1204
1205 err = init_inodecache();
1206 if (err)
1207 goto fail;
1208 err = create_node_manager_caches();
1209 if (err)
1210 goto free_inodecache;
1211 err = create_segment_manager_caches();
1212 if (err)
1213 goto free_node_manager_caches;
1214 err = create_gc_caches();
1215 if (err)
1216 goto free_segment_manager_caches;
1217 err = create_checkpoint_caches();
1218 if (err)
1219 goto free_gc_caches;
1220 f2fs_kset = kset_create_and_add("f2fs", NULL, fs_kobj);
1221 if (!f2fs_kset) {
1222 err = -ENOMEM;
1223 goto free_checkpoint_caches;
1224 }
1225 err = register_filesystem(&f2fs_fs_type);
1226 if (err)
1227 goto free_kset;
1228 f2fs_create_root_stats();
1229 f2fs_proc_root = proc_mkdir("fs/f2fs", NULL);
1230 return 0;
1231
1232 free_kset:
1233 kset_unregister(f2fs_kset);
1234 free_checkpoint_caches:
1235 destroy_checkpoint_caches();
1236 free_gc_caches:
1237 destroy_gc_caches();
1238 free_segment_manager_caches:
1239 destroy_segment_manager_caches();
1240 free_node_manager_caches:
1241 destroy_node_manager_caches();
1242 free_inodecache:
1243 destroy_inodecache();
1244 fail:
1245 return err;
1246 }
1247
1248 static void __exit exit_f2fs_fs(void)
1249 {
1250 remove_proc_entry("fs/f2fs", NULL);
1251 f2fs_destroy_root_stats();
1252 unregister_filesystem(&f2fs_fs_type);
1253 destroy_checkpoint_caches();
1254 destroy_gc_caches();
1255 destroy_segment_manager_caches();
1256 destroy_node_manager_caches();
1257 destroy_inodecache();
1258 kset_unregister(f2fs_kset);
1259 }
1260
1261 module_init(init_f2fs_fs)
1262 module_exit(exit_f2fs_fs)
1263
1264 MODULE_AUTHOR("Samsung Electronics's Praesto Team");
1265 MODULE_DESCRIPTION("Flash Friendly File System");
1266 MODULE_LICENSE("GPL");
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