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Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[GitHub/exynos8895/android_kernel_samsung_universal8895.git] / fs / f2fs / super.c
CommitLineData
0a8165d7 1/*
aff063e2
JK		 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>
aff063e2
JK		 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>
5e176d54 21#include <linux/proc_fs.h>
aff063e2
JK		 22#include <linux/random.h>
23#include <linux/exportfs.h>
d3ee456d 24#include <linux/blkdev.h>
aff063e2 25#include <linux/f2fs_fs.h>
b59d0bae 26#include <linux/sysfs.h>
aff063e2
JK		 27
28#include "f2fs.h"
29#include "node.h"
5ec4e49f 30#include "segment.h"
aff063e2 31#include "xattr.h"
b59d0bae 32#include "gc.h"
aff063e2 33
a2a4a7e4
NJ		 34#define CREATE_TRACE_POINTS
35#include <trace/events/f2fs.h>
36
5e176d54 37static struct proc_dir_entry *f2fs_proc_root;
aff063e2 38static struct kmem_cache *f2fs_inode_cachep;
b59d0bae 39static struct kset *f2fs_kset;
aff063e2
JK		 40
41enum {
696c018c 42 Opt_gc_background,
aff063e2
JK		 43 Opt_disable_roll_forward,
44 Opt_discard,
45 Opt_noheap,
4058c511 46 Opt_user_xattr,
aff063e2 47 Opt_nouser_xattr,
4058c511 48 Opt_acl,
aff063e2
JK		 49 Opt_noacl,
50 Opt_active_logs,
51 Opt_disable_ext_identify,
444c580f 52 Opt_inline_xattr,
8274de77 53 Opt_inline_data,
6b4afdd7 54 Opt_flush_merge,
0f7b2abd 55 Opt_nobarrier,
aff063e2
JK		 56 Opt_err,
57};
58
59static match_table_t f2fs_tokens = {
696c018c 60 {Opt_gc_background, "background_gc=%s"},
aff063e2
JK		 61 {Opt_disable_roll_forward, "disable_roll_forward"},
62 {Opt_discard, "discard"},
63 {Opt_noheap, "no_heap"},
4058c511 64 {Opt_user_xattr, "user_xattr"},
aff063e2 65 {Opt_nouser_xattr, "nouser_xattr"},
4058c511 66 {Opt_acl, "acl"},
aff063e2
JK		 67 {Opt_noacl, "noacl"},
68 {Opt_active_logs, "active_logs=%u"},
69 {Opt_disable_ext_identify, "disable_ext_identify"},
444c580f 70 {Opt_inline_xattr, "inline_xattr"},
8274de77 71 {Opt_inline_data, "inline_data"},
6b4afdd7 72 {Opt_flush_merge, "flush_merge"},
0f7b2abd 73 {Opt_nobarrier, "nobarrier"},
aff063e2
JK		 74 {Opt_err, NULL},
75};
76
b59d0bae 77/* Sysfs support for f2fs */
ea91e9b0
JK		 78enum {
79 GC_THREAD, /* struct f2fs_gc_thread */
80 SM_INFO, /* struct f2fs_sm_info */
cdfc41c1 81 NM_INFO, /* struct f2fs_nm_info */
b1c57c1c 82 F2FS_SBI, /* struct f2fs_sb_info */
ea91e9b0
JK		 83};
84
b59d0bae
NJ		 85struct 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);
ea91e9b0 90 int struct_type;
b59d0bae
NJ		 91 int offset;
92};
93
ea91e9b0
JK		 94static 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);
cdfc41c1
JK		 100 else if (struct_type == NM_INFO)
101 return (unsigned char *)NM_I(sbi);
b1c57c1c
JK		 102 else if (struct_type == F2FS_SBI)
103 return (unsigned char *)sbi;
ea91e9b0
JK		 104 return NULL;
105}
106
b59d0bae
NJ		 107static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
108 struct f2fs_sb_info *sbi, char *buf)
109{
ea91e9b0 110 unsigned char *ptr = NULL;
b59d0bae
NJ		 111 unsigned int *ui;
112
ea91e9b0
JK		 113 ptr = __struct_ptr(sbi, a->struct_type);
114 if (!ptr)
b59d0bae
NJ		 115 return -EINVAL;
116
ea91e9b0 117 ui = (unsigned int *)(ptr + a->offset);
b59d0bae
NJ		 118
119 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
120}
121
122static ssize_t f2fs_sbi_store(struct f2fs_attr *a,
123 struct f2fs_sb_info *sbi,
124 const char *buf, size_t count)
125{
ea91e9b0 126 unsigned char *ptr;
b59d0bae
NJ		 127 unsigned long t;
128 unsigned int *ui;
129 ssize_t ret;
130
ea91e9b0
JK		 131 ptr = __struct_ptr(sbi, a->struct_type);
132 if (!ptr)
b59d0bae
NJ		 133 return -EINVAL;
134
ea91e9b0 135 ui = (unsigned int *)(ptr + a->offset);
b59d0bae
NJ		 136
137 ret = kstrtoul(skip_spaces(buf), 0, &t);
138 if (ret < 0)
139 return ret;
140 *ui = t;
141 return count;
142}
143
144static 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
154static 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
164static 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
ea91e9b0 171#define F2FS_ATTR_OFFSET(_struct_type, _name, _mode, _show, _store, _offset) \
b59d0bae
NJ		 172static struct f2fs_attr f2fs_attr_##_name = { \
173 .attr = {.name = __stringify(_name), .mode = _mode }, \
174 .show = _show, \
175 .store = _store, \
ea91e9b0
JK		 176 .struct_type = _struct_type, \
177 .offset = _offset \
b59d0bae
NJ		 178}
179
ea91e9b0
JK		 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))
b59d0bae 184
ea91e9b0
JK		 185F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_min_sleep_time, min_sleep_time);
186F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_max_sleep_time, max_sleep_time);
187F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_no_gc_sleep_time, no_gc_sleep_time);
188F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_idle, gc_idle);
189F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, reclaim_segments, rec_prefree_segments);
7ac8c3b0 190F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, max_small_discards, max_discards);
216fbd64
JK		 191F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, ipu_policy, ipu_policy);
192F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ipu_util, min_ipu_util);
c1ce1b02 193F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_fsync_blocks, min_fsync_blocks);
cdfc41c1 194F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ram_thresh, ram_thresh);
b1c57c1c 195F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, max_victim_search, max_victim_search);
ab9fa662 196F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, dir_level, dir_level);
b59d0bae
NJ		 197
198#define ATTR_LIST(name) (&f2fs_attr_##name.attr)
199static 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),
d2dc095f 203 ATTR_LIST(gc_idle),
ea91e9b0 204 ATTR_LIST(reclaim_segments),
7ac8c3b0 205 ATTR_LIST(max_small_discards),
216fbd64
JK		 206 ATTR_LIST(ipu_policy),
207 ATTR_LIST(min_ipu_util),
c1ce1b02 208 ATTR_LIST(min_fsync_blocks),
b1c57c1c 209 ATTR_LIST(max_victim_search),
ab9fa662 210 ATTR_LIST(dir_level),
cdfc41c1 211 ATTR_LIST(ram_thresh),
b59d0bae
NJ		 212 NULL,
213};
214
215static const struct sysfs_ops f2fs_attr_ops = {
216 .show = f2fs_attr_show,
217 .store = f2fs_attr_store,
218};
219
220static struct kobj_type f2fs_ktype = {
221 .default_attrs = f2fs_attrs,
222 .sysfs_ops = &f2fs_attr_ops,
223 .release = f2fs_sb_release,
224};
225
a07ef784
NJ		 226void 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
aff063e2
JK		 238static void init_once(void *foo)
239{
240 struct f2fs_inode_info *fi = (struct f2fs_inode_info *) foo;
241
aff063e2
JK		 242 inode_init_once(&fi->vfs_inode);
243}
244
696c018c
NJ		 245static 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;
04c09388 272 if (strlen(name) == 2 && !strncmp(name, "on", 2))
696c018c 273 set_opt(sbi, BG_GC);
04c09388 274 else if (strlen(name) == 3 && !strncmp(name, "off", 3))
696c018c
NJ		 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
4058c511
KA		 292 case Opt_user_xattr:
293 set_opt(sbi, XATTR_USER);
294 break;
696c018c
NJ		 295 case Opt_nouser_xattr:
296 clear_opt(sbi, XATTR_USER);
297 break;
444c580f
JK		 298 case Opt_inline_xattr:
299 set_opt(sbi, INLINE_XATTR);
300 break;
696c018c 301#else
4058c511
KA		 302 case Opt_user_xattr:
303 f2fs_msg(sb, KERN_INFO,
304 "user_xattr options not supported");
305 break;
696c018c
NJ		 306 case Opt_nouser_xattr:
307 f2fs_msg(sb, KERN_INFO,
308 "nouser_xattr options not supported");
309 break;
444c580f
JK		 310 case Opt_inline_xattr:
311 f2fs_msg(sb, KERN_INFO,
312 "inline_xattr options not supported");
313 break;
696c018c
NJ		 314#endif
315#ifdef CONFIG_F2FS_FS_POSIX_ACL
4058c511
KA		 316 case Opt_acl:
317 set_opt(sbi, POSIX_ACL);
318 break;
696c018c
NJ		 319 case Opt_noacl:
320 clear_opt(sbi, POSIX_ACL);
321 break;
322#else
4058c511
KA		 323 case Opt_acl:
324 f2fs_msg(sb, KERN_INFO, "acl options not supported");
325 break;
696c018c
NJ		 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;
8274de77
HL		 340 case Opt_inline_data:
341 set_opt(sbi, INLINE_DATA);
342 break;
6b4afdd7
JK		 343 case Opt_flush_merge:
344 set_opt(sbi, FLUSH_MERGE);
345 break;
0f7b2abd
JK		 346 case Opt_nobarrier:
347 set_opt(sbi, NOBARRIER);
348 break;
696c018c
NJ		 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
aff063e2
JK		 359static struct inode *f2fs_alloc_inode(struct super_block *sb)
360{
361 struct f2fs_inode_info *fi;
362
a0acdfe0 363 fi = kmem_cache_alloc(f2fs_inode_cachep, GFP_F2FS_ZERO);
aff063e2
JK		 364 if (!fi)
365 return NULL;
366
367 init_once((void *) fi);
368
434720fa 369 /* Initialize f2fs-specific inode info */
aff063e2 370 fi->vfs_inode.i_version = 1;
a7ffdbe2 371 atomic_set(&fi->dirty_pages, 0);
aff063e2
JK		 372 fi->i_current_depth = 1;
373 fi->i_advise = 0;
374 rwlock_init(&fi->ext.ext_lock);
d928bfbf 375 init_rwsem(&fi->i_sem);
88b88a66
JK		 376 INIT_LIST_HEAD(&fi->inmem_pages);
377 mutex_init(&fi->inmem_lock);
aff063e2
JK		 378
379 set_inode_flag(fi, FI_NEW_INODE);
380
444c580f
JK		 381 if (test_opt(F2FS_SB(sb), INLINE_XATTR))
382 set_inode_flag(fi, FI_INLINE_XATTR);
383
ab9fa662
JK		 384 /* Will be used by directory only */
385 fi->i_dir_level = F2FS_SB(sb)->dir_level;
386
aff063e2
JK		 387 return &fi->vfs_inode;
388}
389
531ad7d5
JK		 390static int f2fs_drop_inode(struct inode *inode)
391{
392 /*
393 * This is to avoid a deadlock condition like below.
394 * writeback_single_inode(inode)
395 * - f2fs_write_data_page
396 * - f2fs_gc -> iput -> evict
397 * - inode_wait_for_writeback(inode)
398 */
399 if (!inode_unhashed(inode) && inode->i_state & I_SYNC)
400 return 0;
401 return generic_drop_inode(inode);
402}
403
b3783873
JK		 404/*
405 * f2fs_dirty_inode() is called from __mark_inode_dirty()
406 *
407 * We should call set_dirty_inode to write the dirty inode through write_inode.
408 */
409static void f2fs_dirty_inode(struct inode *inode, int flags)
410{
411 set_inode_flag(F2FS_I(inode), FI_DIRTY_INODE);
b3783873
JK		 412}
413
aff063e2
JK		 414static void f2fs_i_callback(struct rcu_head *head)
415{
416 struct inode *inode = container_of(head, struct inode, i_rcu);
417 kmem_cache_free(f2fs_inode_cachep, F2FS_I(inode));
418}
419
25ca923b 420static void f2fs_destroy_inode(struct inode *inode)
aff063e2
JK		 421{
422 call_rcu(&inode->i_rcu, f2fs_i_callback);
423}
424
425static void f2fs_put_super(struct super_block *sb)
426{
427 struct f2fs_sb_info *sbi = F2FS_SB(sb);
428
5e176d54
JK		 429 if (sbi->s_proc) {
430 remove_proc_entry("segment_info", sbi->s_proc);
431 remove_proc_entry(sb->s_id, f2fs_proc_root);
432 }
b59d0bae 433 kobject_del(&sbi->s_kobj);
5e176d54 434
aff063e2
JK		 435 f2fs_destroy_stats(sbi);
436 stop_gc_thread(sbi);
437
5887d291 438 /* We don't need to do checkpoint when it's clean */
75ab4cb8
JK		 439 if (sbi->s_dirty) {
440 struct cp_control cpc = {
441 .reason = CP_UMOUNT,
442 };
443 write_checkpoint(sbi, &cpc);
444 }
aff063e2 445
cf779cab
JK		 446 /*
447 * normally superblock is clean, so we need to release this.
448 * In addition, EIO will skip do checkpoint, we need this as well.
449 */
6f12ac25 450 release_dirty_inode(sbi);
4b2fecc8 451 release_discard_addrs(sbi);
6f12ac25 452
aff063e2
JK		 453 iput(sbi->node_inode);
454 iput(sbi->meta_inode);
455
456 /* destroy f2fs internal modules */
457 destroy_node_manager(sbi);
458 destroy_segment_manager(sbi);
459
460 kfree(sbi->ckpt);
b59d0bae
NJ		 461 kobject_put(&sbi->s_kobj);
462 wait_for_completion(&sbi->s_kobj_unregister);
aff063e2
JK		 463
464 sb->s_fs_info = NULL;
465 brelse(sbi->raw_super_buf);
466 kfree(sbi);
467}
468
469int f2fs_sync_fs(struct super_block *sb, int sync)
470{
471 struct f2fs_sb_info *sbi = F2FS_SB(sb);
aff063e2 472
a2a4a7e4
NJ		 473 trace_f2fs_sync_fs(sb, sync);
474
b7473754 475 if (sync) {
75ab4cb8
JK		 476 struct cp_control cpc = {
477 .reason = CP_SYNC,
478 };
b7473754 479 mutex_lock(&sbi->gc_mutex);
75ab4cb8 480 write_checkpoint(sbi, &cpc);
b7473754
JK		 481 mutex_unlock(&sbi->gc_mutex);
482 } else {
7d82db83 483 f2fs_balance_fs(sbi);
b7473754 484 }
aff063e2 485
64c576fe 486 return 0;
aff063e2
JK		 487}
488
d6212a5f
CL		 489static int f2fs_freeze(struct super_block *sb)
490{
491 int err;
492
77888c1e 493 if (f2fs_readonly(sb))
d6212a5f
CL		 494 return 0;
495
496 err = f2fs_sync_fs(sb, 1);
497 return err;
498}
499
500static int f2fs_unfreeze(struct super_block *sb)
501{
502 return 0;
503}
504
aff063e2
JK		 505static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf)
506{
507 struct super_block *sb = dentry->d_sb;
508 struct f2fs_sb_info *sbi = F2FS_SB(sb);
509 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
510 block_t total_count, user_block_count, start_count, ovp_count;
511
512 total_count = le64_to_cpu(sbi->raw_super->block_count);
513 user_block_count = sbi->user_block_count;
514 start_count = le32_to_cpu(sbi->raw_super->segment0_blkaddr);
515 ovp_count = SM_I(sbi)->ovp_segments << sbi->log_blocks_per_seg;
516 buf->f_type = F2FS_SUPER_MAGIC;
517 buf->f_bsize = sbi->blocksize;
518
519 buf->f_blocks = total_count - start_count;
520 buf->f_bfree = buf->f_blocks - valid_user_blocks(sbi) - ovp_count;
521 buf->f_bavail = user_block_count - valid_user_blocks(sbi);
522
c200b1aa
CY		 523 buf->f_files = sbi->total_node_count - F2FS_RESERVED_NODE_NUM;
524 buf->f_ffree = buf->f_files - valid_inode_count(sbi);
aff063e2 525
5a20d339 526 buf->f_namelen = F2FS_NAME_LEN;
aff063e2
JK		 527 buf->f_fsid.val[0] = (u32)id;
528 buf->f_fsid.val[1] = (u32)(id >> 32);
529
530 return 0;
531}
532
533static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
534{
535 struct f2fs_sb_info *sbi = F2FS_SB(root->d_sb);
536
b270ad6f 537 if (!f2fs_readonly(sbi->sb) && test_opt(sbi, BG_GC))
696c018c 538 seq_printf(seq, ",background_gc=%s", "on");
aff063e2 539 else
696c018c 540 seq_printf(seq, ",background_gc=%s", "off");
aff063e2
JK		 541 if (test_opt(sbi, DISABLE_ROLL_FORWARD))
542 seq_puts(seq, ",disable_roll_forward");
543 if (test_opt(sbi, DISCARD))
544 seq_puts(seq, ",discard");
545 if (test_opt(sbi, NOHEAP))
546 seq_puts(seq, ",no_heap_alloc");
547#ifdef CONFIG_F2FS_FS_XATTR
548 if (test_opt(sbi, XATTR_USER))
549 seq_puts(seq, ",user_xattr");
550 else
551 seq_puts(seq, ",nouser_xattr");
444c580f
JK		 552 if (test_opt(sbi, INLINE_XATTR))
553 seq_puts(seq, ",inline_xattr");
aff063e2
JK		 554#endif
555#ifdef CONFIG_F2FS_FS_POSIX_ACL
556 if (test_opt(sbi, POSIX_ACL))
557 seq_puts(seq, ",acl");
558 else
559 seq_puts(seq, ",noacl");
560#endif
561 if (test_opt(sbi, DISABLE_EXT_IDENTIFY))
aa43507f 562 seq_puts(seq, ",disable_ext_identify");
8274de77
HL		 563 if (test_opt(sbi, INLINE_DATA))
564 seq_puts(seq, ",inline_data");
b270ad6f 565 if (!f2fs_readonly(sbi->sb) && test_opt(sbi, FLUSH_MERGE))
6b4afdd7 566 seq_puts(seq, ",flush_merge");
0f7b2abd
JK		 567 if (test_opt(sbi, NOBARRIER))
568 seq_puts(seq, ",nobarrier");
aff063e2
JK		 569 seq_printf(seq, ",active_logs=%u", sbi->active_logs);
570
571 return 0;
572}
573
5e176d54
JK		 574static int segment_info_seq_show(struct seq_file *seq, void *offset)
575{
576 struct super_block *sb = seq->private;
577 struct f2fs_sb_info *sbi = F2FS_SB(sb);
6c311ec6
CF		 578 unsigned int total_segs =
579 le32_to_cpu(sbi->raw_super->segment_count_main);
5e176d54
JK		 580 int i;
581
90aa6dc9
CY		 582 seq_puts(seq, "format: segment_type|valid_blocks\n"
583 "segment_type(0:HD, 1:WD, 2:CD, 3:HN, 4:WN, 5:CN)\n");
584
5e176d54 585 for (i = 0; i < total_segs; i++) {
90aa6dc9
CY		 586 struct seg_entry *se = get_seg_entry(sbi, i);
587
588 if ((i % 10) == 0)
589 seq_printf(seq, "%-5d", i);
590 seq_printf(seq, "%d|%-3u", se->type,
591 get_valid_blocks(sbi, i, 1));
46c04366
GZ		 592 if ((i % 10) == 9 || i == (total_segs - 1))
593 seq_putc(seq, '\n');
5e176d54 594 else
46c04366 595 seq_putc(seq, ' ');
5e176d54 596 }
46c04366 597
5e176d54
JK		 598 return 0;
599}
600
601static int segment_info_open_fs(struct inode *inode, struct file *file)
602{
603 return single_open(file, segment_info_seq_show, PDE_DATA(inode));
604}
605
606static const struct file_operations f2fs_seq_segment_info_fops = {
607 .owner = THIS_MODULE,
608 .open = segment_info_open_fs,
609 .read = seq_read,
610 .llseek = seq_lseek,
611 .release = single_release,
612};
613
696c018c
NJ		 614static int f2fs_remount(struct super_block *sb, int *flags, char *data)
615{
616 struct f2fs_sb_info *sbi = F2FS_SB(sb);
617 struct f2fs_mount_info org_mount_opt;
618 int err, active_logs;
876dc59e
GZ		 619 bool need_restart_gc = false;
620 bool need_stop_gc = false;
696c018c 621
02b9984d
TT		 622 sync_filesystem(sb);
623
696c018c
NJ		 624 /*
625 * Save the old mount options in case we
626 * need to restore them.
627 */
628 org_mount_opt = sbi->mount_opt;
629 active_logs = sbi->active_logs;
630
26666c8a
CY		 631 sbi->mount_opt.opt = 0;
632 sbi->active_logs = NR_CURSEG_TYPE;
633
696c018c
NJ		 634 /* parse mount options */
635 err = parse_options(sb, data);
636 if (err)
637 goto restore_opts;
638
639 /*
640 * Previous and new state of filesystem is RO,
876dc59e 641 * so skip checking GC and FLUSH_MERGE conditions.
696c018c 642 */
6b2920a5 643 if (f2fs_readonly(sb) && (*flags & MS_RDONLY))
696c018c
NJ		 644 goto skip;
645
646 /*
647 * We stop the GC thread if FS is mounted as RO
648 * or if background_gc = off is passed in mount
649 * option. Also sync the filesystem.
650 */
651 if ((*flags & MS_RDONLY) || !test_opt(sbi, BG_GC)) {
652 if (sbi->gc_thread) {
653 stop_gc_thread(sbi);
654 f2fs_sync_fs(sb, 1);
876dc59e 655 need_restart_gc = true;
696c018c
NJ		 656 }
657 } else if (test_opt(sbi, BG_GC) && !sbi->gc_thread) {
658 err = start_gc_thread(sbi);
659 if (err)
660 goto restore_opts;
876dc59e
GZ		 661 need_stop_gc = true;
662 }
663
664 /*
665 * We stop issue flush thread if FS is mounted as RO
666 * or if flush_merge is not passed in mount option.
667 */
668 if ((*flags & MS_RDONLY) || !test_opt(sbi, FLUSH_MERGE)) {
2163d198 669 destroy_flush_cmd_control(sbi);
6b2920a5 670 } else if (test_opt(sbi, FLUSH_MERGE) && !SM_I(sbi)->cmd_control_info) {
2163d198
GZ		 671 err = create_flush_cmd_control(sbi);
672 if (err)
a688b9d9 673 goto restore_gc;
696c018c
NJ		 674 }
675skip:
676 /* Update the POSIXACL Flag */
677 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
678 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
679 return 0;
876dc59e
GZ		 680restore_gc:
681 if (need_restart_gc) {
682 if (start_gc_thread(sbi))
683 f2fs_msg(sbi->sb, KERN_WARNING,
e1c42045 684 "background gc thread has stopped");
876dc59e
GZ		 685 } else if (need_stop_gc) {
686 stop_gc_thread(sbi);
687 }
696c018c
NJ		 688restore_opts:
689 sbi->mount_opt = org_mount_opt;
690 sbi->active_logs = active_logs;
691 return err;
692}
693
aff063e2
JK		 694static struct super_operations f2fs_sops = {
695 .alloc_inode = f2fs_alloc_inode,
531ad7d5 696 .drop_inode = f2fs_drop_inode,
aff063e2
JK		 697 .destroy_inode = f2fs_destroy_inode,
698 .write_inode = f2fs_write_inode,
b3783873 699 .dirty_inode = f2fs_dirty_inode,
aff063e2
JK		 700 .show_options = f2fs_show_options,
701 .evict_inode = f2fs_evict_inode,
702 .put_super = f2fs_put_super,
703 .sync_fs = f2fs_sync_fs,
d6212a5f
CL		 704 .freeze_fs = f2fs_freeze,
705 .unfreeze_fs = f2fs_unfreeze,
aff063e2 706 .statfs = f2fs_statfs,
696c018c 707 .remount_fs = f2fs_remount,
aff063e2
JK		 708};
709
710static struct inode *f2fs_nfs_get_inode(struct super_block *sb,
711 u64 ino, u32 generation)
712{
713 struct f2fs_sb_info *sbi = F2FS_SB(sb);
714 struct inode *inode;
715
d6b7d4b3 716 if (check_nid_range(sbi, ino))
910bb12d 717 return ERR_PTR(-ESTALE);
aff063e2
JK		 718
719 /*
720 * f2fs_iget isn't quite right if the inode is currently unallocated!
721 * However f2fs_iget currently does appropriate checks to handle stale
722 * inodes so everything is OK.
723 */
724 inode = f2fs_iget(sb, ino);
725 if (IS_ERR(inode))
726 return ERR_CAST(inode);
6bacf52f 727 if (unlikely(generation && inode->i_generation != generation)) {
aff063e2
JK		 728 /* we didn't find the right inode.. */
729 iput(inode);
730 return ERR_PTR(-ESTALE);
731 }
732 return inode;
733}
734
735static struct dentry *f2fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
736 int fh_len, int fh_type)
737{
738 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
739 f2fs_nfs_get_inode);
740}
741
742static struct dentry *f2fs_fh_to_parent(struct super_block *sb, struct fid *fid,
743 int fh_len, int fh_type)
744{
745 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
746 f2fs_nfs_get_inode);
747}
748
749static const struct export_operations f2fs_export_ops = {
750 .fh_to_dentry = f2fs_fh_to_dentry,
751 .fh_to_parent = f2fs_fh_to_parent,
752 .get_parent = f2fs_get_parent,
753};
754
aff063e2
JK		 755static loff_t max_file_size(unsigned bits)
756{
de93653f 757 loff_t result = (DEF_ADDRS_PER_INODE - F2FS_INLINE_XATTR_ADDRS);
aff063e2
JK		 758 loff_t leaf_count = ADDRS_PER_BLOCK;
759
760 /* two direct node blocks */
761 result += (leaf_count * 2);
762
763 /* two indirect node blocks */
764 leaf_count *= NIDS_PER_BLOCK;
765 result += (leaf_count * 2);
766
767 /* one double indirect node block */
768 leaf_count *= NIDS_PER_BLOCK;
769 result += leaf_count;
770
771 result <<= bits;
772 return result;
773}
774
a07ef784
NJ		 775static int sanity_check_raw_super(struct super_block *sb,
776 struct f2fs_super_block *raw_super)
aff063e2
JK		 777{
778 unsigned int blocksize;
779
a07ef784
NJ		 780 if (F2FS_SUPER_MAGIC != le32_to_cpu(raw_super->magic)) {
781 f2fs_msg(sb, KERN_INFO,
782 "Magic Mismatch, valid(0x%x) - read(0x%x)",
783 F2FS_SUPER_MAGIC, le32_to_cpu(raw_super->magic));
aff063e2 784 return 1;
a07ef784 785 }
aff063e2 786
5c9b4692 787 /* Currently, support only 4KB page cache size */
788 if (F2FS_BLKSIZE != PAGE_CACHE_SIZE) {
789 f2fs_msg(sb, KERN_INFO,
14d7e9de 790 "Invalid page_cache_size (%lu), supports only 4KB\n",
5c9b4692 791 PAGE_CACHE_SIZE);
792 return 1;
793 }
794
aff063e2
JK		 795 /* Currently, support only 4KB block size */
796 blocksize = 1 << le32_to_cpu(raw_super->log_blocksize);
5c9b4692 797 if (blocksize != F2FS_BLKSIZE) {
a07ef784
NJ		 798 f2fs_msg(sb, KERN_INFO,
799 "Invalid blocksize (%u), supports only 4KB\n",
800 blocksize);
aff063e2 801 return 1;
a07ef784 802 }
5c9b4692 803
55cf9cb6
CY		 804 /* Currently, support 512/1024/2048/4096 bytes sector size */
805 if (le32_to_cpu(raw_super->log_sectorsize) >
806 F2FS_MAX_LOG_SECTOR_SIZE ||
807 le32_to_cpu(raw_super->log_sectorsize) <
808 F2FS_MIN_LOG_SECTOR_SIZE) {
809 f2fs_msg(sb, KERN_INFO, "Invalid log sectorsize (%u)",
810 le32_to_cpu(raw_super->log_sectorsize));
aff063e2 811 return 1;
a07ef784 812 }
55cf9cb6
CY		 813 if (le32_to_cpu(raw_super->log_sectors_per_block) +
814 le32_to_cpu(raw_super->log_sectorsize) !=
815 F2FS_MAX_LOG_SECTOR_SIZE) {
816 f2fs_msg(sb, KERN_INFO,
817 "Invalid log sectors per block(%u) log sectorsize(%u)",
818 le32_to_cpu(raw_super->log_sectors_per_block),
819 le32_to_cpu(raw_super->log_sectorsize));
aff063e2 820 return 1;
a07ef784 821 }
aff063e2
JK		 822 return 0;
823}
824
577e3495 825static int sanity_check_ckpt(struct f2fs_sb_info *sbi)
aff063e2
JK		 826{
827 unsigned int total, fsmeta;
577e3495
JK		 828 struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
829 struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
aff063e2
JK		 830
831 total = le32_to_cpu(raw_super->segment_count);
832 fsmeta = le32_to_cpu(raw_super->segment_count_ckpt);
833 fsmeta += le32_to_cpu(raw_super->segment_count_sit);
834 fsmeta += le32_to_cpu(raw_super->segment_count_nat);
835 fsmeta += le32_to_cpu(ckpt->rsvd_segment_count);
836 fsmeta += le32_to_cpu(raw_super->segment_count_ssa);
837
6bacf52f 838 if (unlikely(fsmeta >= total))
aff063e2 839 return 1;
577e3495 840
1e968fdf 841 if (unlikely(f2fs_cp_error(sbi))) {
577e3495
JK		 842 f2fs_msg(sbi->sb, KERN_ERR, "A bug case: need to run fsck");
843 return 1;
844 }
aff063e2
JK		 845 return 0;
846}
847
848static void init_sb_info(struct f2fs_sb_info *sbi)
849{
850 struct f2fs_super_block *raw_super = sbi->raw_super;
851 int i;
852
853 sbi->log_sectors_per_block =
854 le32_to_cpu(raw_super->log_sectors_per_block);
855 sbi->log_blocksize = le32_to_cpu(raw_super->log_blocksize);
856 sbi->blocksize = 1 << sbi->log_blocksize;
857 sbi->log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
858 sbi->blocks_per_seg = 1 << sbi->log_blocks_per_seg;
859 sbi->segs_per_sec = le32_to_cpu(raw_super->segs_per_sec);
860 sbi->secs_per_zone = le32_to_cpu(raw_super->secs_per_zone);
861 sbi->total_sections = le32_to_cpu(raw_super->section_count);
862 sbi->total_node_count =
863 (le32_to_cpu(raw_super->segment_count_nat) / 2)
864 * sbi->blocks_per_seg * NAT_ENTRY_PER_BLOCK;
865 sbi->root_ino_num = le32_to_cpu(raw_super->root_ino);
866 sbi->node_ino_num = le32_to_cpu(raw_super->node_ino);
867 sbi->meta_ino_num = le32_to_cpu(raw_super->meta_ino);
5ec4e49f 868 sbi->cur_victim_sec = NULL_SECNO;
b1c57c1c 869 sbi->max_victim_search = DEF_MAX_VICTIM_SEARCH;
aff063e2
JK		 870
871 for (i = 0; i < NR_COUNT_TYPE; i++)
872 atomic_set(&sbi->nr_pages[i], 0);
ab9fa662
JK		 873
874 sbi->dir_level = DEF_DIR_LEVEL;
2ae4c673 875 sbi->need_fsck = false;
aff063e2
JK		 876}
877
9076a75f
GZ		 878/*
879 * Read f2fs raw super block.
880 * Because we have two copies of super block, so read the first one at first,
881 * if the first one is invalid, move to read the second one.
882 */
883static int read_raw_super_block(struct super_block *sb,
884 struct f2fs_super_block **raw_super,
885 struct buffer_head **raw_super_buf)
14d7e9de 886{
9076a75f 887 int block = 0;
14d7e9de 888
9076a75f 889retry:
14d7e9de 890 *raw_super_buf = sb_bread(sb, block);
891 if (!*raw_super_buf) {
9076a75f
GZ		 892 f2fs_msg(sb, KERN_ERR, "Unable to read %dth superblock",
893 block + 1);
894 if (block == 0) {
895 block++;
896 goto retry;
897 } else {
898 return -EIO;
899 }
14d7e9de 900 }
901
902 *raw_super = (struct f2fs_super_block *)
903 ((char *)(*raw_super_buf)->b_data + F2FS_SUPER_OFFSET);
904
905 /* sanity checking of raw super */
9076a75f
GZ		 906 if (sanity_check_raw_super(sb, *raw_super)) {
907 brelse(*raw_super_buf);
6c311ec6
CF		 908 f2fs_msg(sb, KERN_ERR,
909 "Can't find valid F2FS filesystem in %dth superblock",
910 block + 1);
6bacf52f 911 if (block == 0) {
9076a75f
GZ		 912 block++;
913 goto retry;
914 } else {
915 return -EINVAL;
916 }
917 }
14d7e9de 918
9076a75f 919 return 0;
14d7e9de 920}
921
aff063e2
JK		 922static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
923{
924 struct f2fs_sb_info *sbi;
925 struct f2fs_super_block *raw_super;
926 struct buffer_head *raw_super_buf;
927 struct inode *root;
928 long err = -EINVAL;
ed2e621a 929 bool retry = true;
971767ca 930 int i;
aff063e2 931
ed2e621a 932try_onemore:
aff063e2
JK		 933 /* allocate memory for f2fs-specific super block info */
934 sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL);
935 if (!sbi)
936 return -ENOMEM;
937
ff9234ad 938 /* set a block size */
6bacf52f 939 if (unlikely(!sb_set_blocksize(sb, F2FS_BLKSIZE))) {
a07ef784 940 f2fs_msg(sb, KERN_ERR, "unable to set blocksize");
aff063e2 941 goto free_sbi;
a07ef784 942 }
aff063e2 943
9076a75f
GZ		 944 err = read_raw_super_block(sb, &raw_super, &raw_super_buf);
945 if (err)
946 goto free_sbi;
947
5fb08372 948 sb->s_fs_info = sbi;
aff063e2
JK		 949 /* init some FS parameters */
950 sbi->active_logs = NR_CURSEG_TYPE;
951
952 set_opt(sbi, BG_GC);
953
954#ifdef CONFIG_F2FS_FS_XATTR
955 set_opt(sbi, XATTR_USER);
956#endif
957#ifdef CONFIG_F2FS_FS_POSIX_ACL
958 set_opt(sbi, POSIX_ACL);
959#endif
960 /* parse mount options */
5fb08372 961 err = parse_options(sb, (char *)data);
66348b72 962 if (err)
aff063e2
JK		 963 goto free_sb_buf;
964
25ca923b 965 sb->s_maxbytes = max_file_size(le32_to_cpu(raw_super->log_blocksize));
aff063e2
JK		 966 sb->s_max_links = F2FS_LINK_MAX;
967 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
968
969 sb->s_op = &f2fs_sops;
970 sb->s_xattr = f2fs_xattr_handlers;
971 sb->s_export_op = &f2fs_export_ops;
972 sb->s_magic = F2FS_SUPER_MAGIC;
aff063e2
JK		 973 sb->s_time_gran = 1;
974 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
975 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
976 memcpy(sb->s_uuid, raw_super->uuid, sizeof(raw_super->uuid));
977
978 /* init f2fs-specific super block info */
979 sbi->sb = sb;
980 sbi->raw_super = raw_super;
981 sbi->raw_super_buf = raw_super_buf;
982 mutex_init(&sbi->gc_mutex);
aff063e2
JK		 983 mutex_init(&sbi->writepages);
984 mutex_init(&sbi->cp_mutex);
b3582c68 985 init_rwsem(&sbi->node_write);
aabe5136 986 sbi->por_doing = false;
aff063e2 987 spin_lock_init(&sbi->stat_lock);
971767ca 988
df0f8dc0 989 init_rwsem(&sbi->read_io.io_rwsem);
458e6197
JK		 990 sbi->read_io.sbi = sbi;
991 sbi->read_io.bio = NULL;
992 for (i = 0; i < NR_PAGE_TYPE; i++) {
df0f8dc0 993 init_rwsem(&sbi->write_io[i].io_rwsem);
458e6197
JK		 994 sbi->write_io[i].sbi = sbi;
995 sbi->write_io[i].bio = NULL;
996 }
971767ca 997
e479556b 998 init_rwsem(&sbi->cp_rwsem);
fb51b5ef 999 init_waitqueue_head(&sbi->cp_wait);
aff063e2
JK		 1000 init_sb_info(sbi);
1001
1002 /* get an inode for meta space */
1003 sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi));
1004 if (IS_ERR(sbi->meta_inode)) {
a07ef784 1005 f2fs_msg(sb, KERN_ERR, "Failed to read F2FS meta data inode");
aff063e2
JK		 1006 err = PTR_ERR(sbi->meta_inode);
1007 goto free_sb_buf;
1008 }
1009
1010 err = get_valid_checkpoint(sbi);
a07ef784
NJ		 1011 if (err) {
1012 f2fs_msg(sb, KERN_ERR, "Failed to get valid F2FS checkpoint");
aff063e2 1013 goto free_meta_inode;
a07ef784 1014 }
aff063e2
JK		 1015
1016 /* sanity checking of checkpoint */
1017 err = -EINVAL;
577e3495 1018 if (sanity_check_ckpt(sbi)) {
a07ef784 1019 f2fs_msg(sb, KERN_ERR, "Invalid F2FS checkpoint");
aff063e2 1020 goto free_cp;
a07ef784 1021 }
aff063e2
JK		 1022
1023 sbi->total_valid_node_count =
1024 le32_to_cpu(sbi->ckpt->valid_node_count);
1025 sbi->total_valid_inode_count =
1026 le32_to_cpu(sbi->ckpt->valid_inode_count);
1027 sbi->user_block_count = le64_to_cpu(sbi->ckpt->user_block_count);
1028 sbi->total_valid_block_count =
1029 le64_to_cpu(sbi->ckpt->valid_block_count);
1030 sbi->last_valid_block_count = sbi->total_valid_block_count;
1031 sbi->alloc_valid_block_count = 0;
1032 INIT_LIST_HEAD(&sbi->dir_inode_list);
1033 spin_lock_init(&sbi->dir_inode_lock);
1034
6451e041 1035 init_ino_entry_info(sbi);
aff063e2
JK		 1036
1037 /* setup f2fs internal modules */
1038 err = build_segment_manager(sbi);
a07ef784
NJ		 1039 if (err) {
1040 f2fs_msg(sb, KERN_ERR,
1041 "Failed to initialize F2FS segment manager");
aff063e2 1042 goto free_sm;
a07ef784 1043 }
aff063e2 1044 err = build_node_manager(sbi);
a07ef784
NJ		 1045 if (err) {
1046 f2fs_msg(sb, KERN_ERR,
1047 "Failed to initialize F2FS node manager");
aff063e2 1048 goto free_nm;
a07ef784 1049 }
aff063e2
JK		 1050
1051 build_gc_manager(sbi);
1052
1053 /* get an inode for node space */
1054 sbi->node_inode = f2fs_iget(sb, F2FS_NODE_INO(sbi));
1055 if (IS_ERR(sbi->node_inode)) {
a07ef784 1056 f2fs_msg(sb, KERN_ERR, "Failed to read node inode");
aff063e2
JK		 1057 err = PTR_ERR(sbi->node_inode);
1058 goto free_nm;
1059 }
1060
1061 /* if there are nt orphan nodes free them */
8f99a946 1062 recover_orphan_inodes(sbi);
aff063e2
JK		 1063
1064 /* read root inode and dentry */
1065 root = f2fs_iget(sb, F2FS_ROOT_INO(sbi));
1066 if (IS_ERR(root)) {
a07ef784 1067 f2fs_msg(sb, KERN_ERR, "Failed to read root inode");
aff063e2
JK		 1068 err = PTR_ERR(root);
1069 goto free_node_inode;
1070 }
8f99a946 1071 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
9d847950 1072 iput(root);
8f99a946 1073 err = -EINVAL;
9d847950 1074 goto free_node_inode;
8f99a946 1075 }
aff063e2
JK		 1076
1077 sb->s_root = d_make_root(root); /* allocate root dentry */
1078 if (!sb->s_root) {
1079 err = -ENOMEM;
1080 goto free_root_inode;
1081 }
1082
aff063e2
JK		 1083 err = f2fs_build_stats(sbi);
1084 if (err)
6437d1b0 1085 goto free_root_inode;
aff063e2 1086
5e176d54
JK		 1087 if (f2fs_proc_root)
1088 sbi->s_proc = proc_mkdir(sb->s_id, f2fs_proc_root);
1089
1090 if (sbi->s_proc)
1091 proc_create_data("segment_info", S_IRUGO, sbi->s_proc,
1092 &f2fs_seq_segment_info_fops, sb);
1093
d3ee456d
NJ		 1094 if (test_opt(sbi, DISCARD)) {
1095 struct request_queue *q = bdev_get_queue(sb->s_bdev);
1096 if (!blk_queue_discard(q))
1097 f2fs_msg(sb, KERN_WARNING,
1098 "mounting with \"discard\" option, but "
1099 "the device does not support discard");
1100 }
1101
b59d0bae
NJ		 1102 sbi->s_kobj.kset = f2fs_kset;
1103 init_completion(&sbi->s_kobj_unregister);
1104 err = kobject_init_and_add(&sbi->s_kobj, &f2fs_ktype, NULL,
1105 "%s", sb->s_id);
1106 if (err)
6437d1b0 1107 goto free_proc;
b59d0bae 1108
b0c44f05
JK		 1109 if (!retry)
1110 sbi->need_fsck = true;
1111
6437d1b0
JK		 1112 /* recover fsynced data */
1113 if (!test_opt(sbi, DISABLE_ROLL_FORWARD)) {
1114 err = recover_fsync_data(sbi);
ed2e621a 1115 if (err) {
6437d1b0
JK		 1116 f2fs_msg(sb, KERN_ERR,
1117 "Cannot recover all fsync data errno=%ld", err);
ed2e621a
JK		 1118 goto free_kobj;
1119 }
6437d1b0 1120 }
b59d0bae 1121
6437d1b0
JK		 1122 /*
1123 * If filesystem is not mounted as read-only then
1124 * do start the gc_thread.
1125 */
6b2920a5 1126 if (!f2fs_readonly(sb)) {
6437d1b0
JK		 1127 /* After POR, we can run background GC thread.*/
1128 err = start_gc_thread(sbi);
1129 if (err)
1130 goto free_kobj;
1131 }
aff063e2 1132 return 0;
6437d1b0
JK		 1133
1134free_kobj:
1135 kobject_del(&sbi->s_kobj);
1136free_proc:
1d15bd20
CY		 1137 if (sbi->s_proc) {
1138 remove_proc_entry("segment_info", sbi->s_proc);
1139 remove_proc_entry(sb->s_id, f2fs_proc_root);
1140 }
1141 f2fs_destroy_stats(sbi);
aff063e2
JK		 1142free_root_inode:
1143 dput(sb->s_root);
1144 sb->s_root = NULL;
1145free_node_inode:
1146 iput(sbi->node_inode);
1147free_nm:
1148 destroy_node_manager(sbi);
1149free_sm:
1150 destroy_segment_manager(sbi);
1151free_cp:
1152 kfree(sbi->ckpt);
1153free_meta_inode:
1154 make_bad_inode(sbi->meta_inode);
1155 iput(sbi->meta_inode);
1156free_sb_buf:
1157 brelse(raw_super_buf);
1158free_sbi:
1159 kfree(sbi);
ed2e621a
JK		 1160
1161 /* give only one another chance */
1162 if (retry) {
922cedbd 1163 retry = 0;
ed2e621a
JK		 1164 shrink_dcache_sb(sb);
1165 goto try_onemore;
1166 }
aff063e2
JK		 1167 return err;
1168}
1169
1170static struct dentry *f2fs_mount(struct file_system_type *fs_type, int flags,
1171 const char *dev_name, void *data)
1172{
1173 return mount_bdev(fs_type, flags, dev_name, data, f2fs_fill_super);
1174}
1175
1176static struct file_system_type f2fs_fs_type = {
1177 .owner = THIS_MODULE,
1178 .name = "f2fs",
1179 .mount = f2fs_mount,
1180 .kill_sb = kill_block_super,
1181 .fs_flags = FS_REQUIRES_DEV,
1182};
7f78e035 1183MODULE_ALIAS_FS("f2fs");
aff063e2 1184
6e6093a8 1185static int __init init_inodecache(void)
aff063e2
JK		 1186{
1187 f2fs_inode_cachep = f2fs_kmem_cache_create("f2fs_inode_cache",
e8512d2e 1188 sizeof(struct f2fs_inode_info));
6bacf52f 1189 if (!f2fs_inode_cachep)
aff063e2
JK		 1190 return -ENOMEM;
1191 return 0;
1192}
1193
1194static void destroy_inodecache(void)
1195{
1196 /*
1197 * Make sure all delayed rcu free inodes are flushed before we
1198 * destroy cache.
1199 */
1200 rcu_barrier();
1201 kmem_cache_destroy(f2fs_inode_cachep);
1202}
1203
1204static int __init init_f2fs_fs(void)
1205{
1206 int err;
1207
1208 err = init_inodecache();
1209 if (err)
1210 goto fail;
1211 err = create_node_manager_caches();
1212 if (err)
9890ff3f 1213 goto free_inodecache;
7fd9e544 1214 err = create_segment_manager_caches();
aff063e2 1215 if (err)
9890ff3f 1216 goto free_node_manager_caches;
7fd9e544
JK		 1217 err = create_gc_caches();
1218 if (err)
1219 goto free_segment_manager_caches;
aff063e2
JK		 1220 err = create_checkpoint_caches();
1221 if (err)
9890ff3f 1222 goto free_gc_caches;
b59d0bae 1223 f2fs_kset = kset_create_and_add("f2fs", NULL, fs_kobj);
6e6b978c
WY		 1224 if (!f2fs_kset) {
1225 err = -ENOMEM;
9890ff3f 1226 goto free_checkpoint_caches;
6e6b978c 1227 }
4589d25d
NJ		 1228 err = register_filesystem(&f2fs_fs_type);
1229 if (err)
9890ff3f 1230 goto free_kset;
4589d25d 1231 f2fs_create_root_stats();
5e176d54 1232 f2fs_proc_root = proc_mkdir("fs/f2fs", NULL);
9890ff3f
ZH		 1233 return 0;
1234
1235free_kset:
1236 kset_unregister(f2fs_kset);
1237free_checkpoint_caches:
1238 destroy_checkpoint_caches();
1239free_gc_caches:
1240 destroy_gc_caches();
7fd9e544
JK		 1241free_segment_manager_caches:
1242 destroy_segment_manager_caches();
9890ff3f
ZH		 1243free_node_manager_caches:
1244 destroy_node_manager_caches();
1245free_inodecache:
1246 destroy_inodecache();
aff063e2
JK		 1247fail:
1248 return err;
1249}
1250
1251static void __exit exit_f2fs_fs(void)
1252{
5e176d54 1253 remove_proc_entry("fs/f2fs", NULL);
4589d25d 1254 f2fs_destroy_root_stats();
aff063e2
JK		 1255 unregister_filesystem(&f2fs_fs_type);
1256 destroy_checkpoint_caches();
1257 destroy_gc_caches();
5dcd8a71 1258 destroy_segment_manager_caches();
aff063e2
JK		 1259 destroy_node_manager_caches();
1260 destroy_inodecache();
b59d0bae 1261 kset_unregister(f2fs_kset);
aff063e2
JK		 1262}
1263
1264module_init(init_f2fs_fs)
1265module_exit(exit_f2fs_fs)
1266
1267MODULE_AUTHOR("Samsung Electronics's Praesto Team");
1268MODULE_DESCRIPTION("Flash Friendly File System");
1269MODULE_LICENSE("GPL");