blob: e194578b35943cf204312c57dec980942f569c26 [file] [log] [blame]
Jaegeuk Kim0a8165d2012-11-29 13:28:09 +09001/*
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09002 * 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>
Jaegeuk Kimaff063e2012-11-02 17:07:47 +090015#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>
Jaegeuk Kim5e176d52013-06-28 12:47:01 +090021#include <linux/proc_fs.h>
Jaegeuk Kimaff063e2012-11-02 17:07:47 +090022#include <linux/random.h>
23#include <linux/exportfs.h>
Namjae Jeond3ee4562013-03-17 17:26:14 +090024#include <linux/blkdev.h>
Jaegeuk Kimaff063e2012-11-02 17:07:47 +090025#include <linux/f2fs_fs.h>
Namjae Jeonb59d0ba2013-08-04 23:09:40 +090026#include <linux/sysfs.h>
Jaegeuk Kimaff063e2012-11-02 17:07:47 +090027
28#include "f2fs.h"
29#include "node.h"
Jaegeuk Kim5ec4e492013-03-31 13:26:03 +090030#include "segment.h"
Jaegeuk Kimaff063e2012-11-02 17:07:47 +090031#include "xattr.h"
Namjae Jeonb59d0ba2013-08-04 23:09:40 +090032#include "gc.h"
Jaegeuk Kimaff063e2012-11-02 17:07:47 +090033
Namjae Jeona2a4a7e2013-04-20 01:28:40 +090034#define CREATE_TRACE_POINTS
35#include <trace/events/f2fs.h>
36
Jaegeuk Kim5e176d52013-06-28 12:47:01 +090037static struct proc_dir_entry *f2fs_proc_root;
Jaegeuk Kimaff063e2012-11-02 17:07:47 +090038static struct kmem_cache *f2fs_inode_cachep;
Namjae Jeonb59d0ba2013-08-04 23:09:40 +090039static struct kset *f2fs_kset;
Jaegeuk Kimaff063e2012-11-02 17:07:47 +090040
41enum {
Namjae Jeon696c0182013-06-16 09:48:48 +090042 Opt_gc_background,
Jaegeuk Kimaff063e2012-11-02 17:07:47 +090043 Opt_disable_roll_forward,
44 Opt_discard,
45 Opt_noheap,
Kelly Anderson4058c512013-10-07 11:36:20 +090046 Opt_user_xattr,
Jaegeuk Kimaff063e2012-11-02 17:07:47 +090047 Opt_nouser_xattr,
Kelly Anderson4058c512013-10-07 11:36:20 +090048 Opt_acl,
Jaegeuk Kimaff063e2012-11-02 17:07:47 +090049 Opt_noacl,
50 Opt_active_logs,
51 Opt_disable_ext_identify,
Jaegeuk Kim444c5802013-08-08 15:16:22 +090052 Opt_inline_xattr,
Jaegeuk Kimaff063e2012-11-02 17:07:47 +090053 Opt_err,
54};
55
56static match_table_t f2fs_tokens = {
Namjae Jeon696c0182013-06-16 09:48:48 +090057 {Opt_gc_background, "background_gc=%s"},
Jaegeuk Kimaff063e2012-11-02 17:07:47 +090058 {Opt_disable_roll_forward, "disable_roll_forward"},
59 {Opt_discard, "discard"},
60 {Opt_noheap, "no_heap"},
Kelly Anderson4058c512013-10-07 11:36:20 +090061 {Opt_user_xattr, "user_xattr"},
Jaegeuk Kimaff063e2012-11-02 17:07:47 +090062 {Opt_nouser_xattr, "nouser_xattr"},
Kelly Anderson4058c512013-10-07 11:36:20 +090063 {Opt_acl, "acl"},
Jaegeuk Kimaff063e2012-11-02 17:07:47 +090064 {Opt_noacl, "noacl"},
65 {Opt_active_logs, "active_logs=%u"},
66 {Opt_disable_ext_identify, "disable_ext_identify"},
Jaegeuk Kim444c5802013-08-08 15:16:22 +090067 {Opt_inline_xattr, "inline_xattr"},
Jaegeuk Kimaff063e2012-11-02 17:07:47 +090068 {Opt_err, NULL},
69};
70
Namjae Jeonb59d0ba2013-08-04 23:09:40 +090071/* Sysfs support for f2fs */
Jaegeuk Kimea91e9b2013-10-24 15:49:07 +090072enum {
73 GC_THREAD, /* struct f2fs_gc_thread */
74 SM_INFO, /* struct f2fs_sm_info */
75};
76
Namjae Jeonb59d0ba2013-08-04 23:09:40 +090077struct f2fs_attr {
78 struct attribute attr;
79 ssize_t (*show)(struct f2fs_attr *, struct f2fs_sb_info *, char *);
80 ssize_t (*store)(struct f2fs_attr *, struct f2fs_sb_info *,
81 const char *, size_t);
Jaegeuk Kimea91e9b2013-10-24 15:49:07 +090082 int struct_type;
Namjae Jeonb59d0ba2013-08-04 23:09:40 +090083 int offset;
84};
85
Jaegeuk Kimea91e9b2013-10-24 15:49:07 +090086static unsigned char *__struct_ptr(struct f2fs_sb_info *sbi, int struct_type)
87{
88 if (struct_type == GC_THREAD)
89 return (unsigned char *)sbi->gc_thread;
90 else if (struct_type == SM_INFO)
91 return (unsigned char *)SM_I(sbi);
92 return NULL;
93}
94
Namjae Jeonb59d0ba2013-08-04 23:09:40 +090095static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
96 struct f2fs_sb_info *sbi, char *buf)
97{
Jaegeuk Kimea91e9b2013-10-24 15:49:07 +090098 unsigned char *ptr = NULL;
Namjae Jeonb59d0ba2013-08-04 23:09:40 +090099 unsigned int *ui;
100
Jaegeuk Kimea91e9b2013-10-24 15:49:07 +0900101 ptr = __struct_ptr(sbi, a->struct_type);
102 if (!ptr)
Namjae Jeonb59d0ba2013-08-04 23:09:40 +0900103 return -EINVAL;
104
Jaegeuk Kimea91e9b2013-10-24 15:49:07 +0900105 ui = (unsigned int *)(ptr + a->offset);
Namjae Jeonb59d0ba2013-08-04 23:09:40 +0900106
107 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
108}
109
110static ssize_t f2fs_sbi_store(struct f2fs_attr *a,
111 struct f2fs_sb_info *sbi,
112 const char *buf, size_t count)
113{
Jaegeuk Kimea91e9b2013-10-24 15:49:07 +0900114 unsigned char *ptr;
Namjae Jeonb59d0ba2013-08-04 23:09:40 +0900115 unsigned long t;
116 unsigned int *ui;
117 ssize_t ret;
118
Jaegeuk Kimea91e9b2013-10-24 15:49:07 +0900119 ptr = __struct_ptr(sbi, a->struct_type);
120 if (!ptr)
Namjae Jeonb59d0ba2013-08-04 23:09:40 +0900121 return -EINVAL;
122
Jaegeuk Kimea91e9b2013-10-24 15:49:07 +0900123 ui = (unsigned int *)(ptr + a->offset);
Namjae Jeonb59d0ba2013-08-04 23:09:40 +0900124
125 ret = kstrtoul(skip_spaces(buf), 0, &t);
126 if (ret < 0)
127 return ret;
128 *ui = t;
129 return count;
130}
131
132static ssize_t f2fs_attr_show(struct kobject *kobj,
133 struct attribute *attr, char *buf)
134{
135 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
136 s_kobj);
137 struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
138
139 return a->show ? a->show(a, sbi, buf) : 0;
140}
141
142static ssize_t f2fs_attr_store(struct kobject *kobj, struct attribute *attr,
143 const char *buf, size_t len)
144{
145 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
146 s_kobj);
147 struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
148
149 return a->store ? a->store(a, sbi, buf, len) : 0;
150}
151
152static void f2fs_sb_release(struct kobject *kobj)
153{
154 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
155 s_kobj);
156 complete(&sbi->s_kobj_unregister);
157}
158
Jaegeuk Kimea91e9b2013-10-24 15:49:07 +0900159#define F2FS_ATTR_OFFSET(_struct_type, _name, _mode, _show, _store, _offset) \
Namjae Jeonb59d0ba2013-08-04 23:09:40 +0900160static struct f2fs_attr f2fs_attr_##_name = { \
161 .attr = {.name = __stringify(_name), .mode = _mode }, \
162 .show = _show, \
163 .store = _store, \
Jaegeuk Kimea91e9b2013-10-24 15:49:07 +0900164 .struct_type = _struct_type, \
165 .offset = _offset \
Namjae Jeonb59d0ba2013-08-04 23:09:40 +0900166}
167
Jaegeuk Kimea91e9b2013-10-24 15:49:07 +0900168#define F2FS_RW_ATTR(struct_type, struct_name, name, elname) \
169 F2FS_ATTR_OFFSET(struct_type, name, 0644, \
170 f2fs_sbi_show, f2fs_sbi_store, \
171 offsetof(struct struct_name, elname))
Namjae Jeonb59d0ba2013-08-04 23:09:40 +0900172
Jaegeuk Kimea91e9b2013-10-24 15:49:07 +0900173F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_min_sleep_time, min_sleep_time);
174F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_max_sleep_time, max_sleep_time);
175F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_no_gc_sleep_time, no_gc_sleep_time);
176F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_idle, gc_idle);
177F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, reclaim_segments, rec_prefree_segments);
Jaegeuk Kim7ac8c3b2013-11-12 15:00:38 +0900178F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, max_small_discards, max_discards);
Namjae Jeonb59d0ba2013-08-04 23:09:40 +0900179
180#define ATTR_LIST(name) (&f2fs_attr_##name.attr)
181static struct attribute *f2fs_attrs[] = {
182 ATTR_LIST(gc_min_sleep_time),
183 ATTR_LIST(gc_max_sleep_time),
184 ATTR_LIST(gc_no_gc_sleep_time),
Namjae Jeond2dc0952013-08-04 23:10:15 +0900185 ATTR_LIST(gc_idle),
Jaegeuk Kimea91e9b2013-10-24 15:49:07 +0900186 ATTR_LIST(reclaim_segments),
Jaegeuk Kim7ac8c3b2013-11-12 15:00:38 +0900187 ATTR_LIST(max_small_discards),
Namjae Jeonb59d0ba2013-08-04 23:09:40 +0900188 NULL,
189};
190
191static const struct sysfs_ops f2fs_attr_ops = {
192 .show = f2fs_attr_show,
193 .store = f2fs_attr_store,
194};
195
196static struct kobj_type f2fs_ktype = {
197 .default_attrs = f2fs_attrs,
198 .sysfs_ops = &f2fs_attr_ops,
199 .release = f2fs_sb_release,
200};
201
Namjae Jeona07ef782012-12-30 14:52:05 +0900202void f2fs_msg(struct super_block *sb, const char *level, const char *fmt, ...)
203{
204 struct va_format vaf;
205 va_list args;
206
207 va_start(args, fmt);
208 vaf.fmt = fmt;
209 vaf.va = &args;
210 printk("%sF2FS-fs (%s): %pV\n", level, sb->s_id, &vaf);
211 va_end(args);
212}
213
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900214static void init_once(void *foo)
215{
216 struct f2fs_inode_info *fi = (struct f2fs_inode_info *) foo;
217
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900218 inode_init_once(&fi->vfs_inode);
219}
220
Namjae Jeon696c0182013-06-16 09:48:48 +0900221static int parse_options(struct super_block *sb, char *options)
222{
223 struct f2fs_sb_info *sbi = F2FS_SB(sb);
224 substring_t args[MAX_OPT_ARGS];
225 char *p, *name;
226 int arg = 0;
227
228 if (!options)
229 return 0;
230
231 while ((p = strsep(&options, ",")) != NULL) {
232 int token;
233 if (!*p)
234 continue;
235 /*
236 * Initialize args struct so we know whether arg was
237 * found; some options take optional arguments.
238 */
239 args[0].to = args[0].from = NULL;
240 token = match_token(p, f2fs_tokens, args);
241
242 switch (token) {
243 case Opt_gc_background:
244 name = match_strdup(&args[0]);
245
246 if (!name)
247 return -ENOMEM;
248 if (!strncmp(name, "on", 2))
249 set_opt(sbi, BG_GC);
250 else if (!strncmp(name, "off", 3))
251 clear_opt(sbi, BG_GC);
252 else {
253 kfree(name);
254 return -EINVAL;
255 }
256 kfree(name);
257 break;
258 case Opt_disable_roll_forward:
259 set_opt(sbi, DISABLE_ROLL_FORWARD);
260 break;
261 case Opt_discard:
262 set_opt(sbi, DISCARD);
263 break;
264 case Opt_noheap:
265 set_opt(sbi, NOHEAP);
266 break;
267#ifdef CONFIG_F2FS_FS_XATTR
Kelly Anderson4058c512013-10-07 11:36:20 +0900268 case Opt_user_xattr:
269 set_opt(sbi, XATTR_USER);
270 break;
Namjae Jeon696c0182013-06-16 09:48:48 +0900271 case Opt_nouser_xattr:
272 clear_opt(sbi, XATTR_USER);
273 break;
Jaegeuk Kim444c5802013-08-08 15:16:22 +0900274 case Opt_inline_xattr:
275 set_opt(sbi, INLINE_XATTR);
276 break;
Namjae Jeon696c0182013-06-16 09:48:48 +0900277#else
Kelly Anderson4058c512013-10-07 11:36:20 +0900278 case Opt_user_xattr:
279 f2fs_msg(sb, KERN_INFO,
280 "user_xattr options not supported");
281 break;
Namjae Jeon696c0182013-06-16 09:48:48 +0900282 case Opt_nouser_xattr:
283 f2fs_msg(sb, KERN_INFO,
284 "nouser_xattr options not supported");
285 break;
Jaegeuk Kim444c5802013-08-08 15:16:22 +0900286 case Opt_inline_xattr:
287 f2fs_msg(sb, KERN_INFO,
288 "inline_xattr options not supported");
289 break;
Namjae Jeon696c0182013-06-16 09:48:48 +0900290#endif
291#ifdef CONFIG_F2FS_FS_POSIX_ACL
Kelly Anderson4058c512013-10-07 11:36:20 +0900292 case Opt_acl:
293 set_opt(sbi, POSIX_ACL);
294 break;
Namjae Jeon696c0182013-06-16 09:48:48 +0900295 case Opt_noacl:
296 clear_opt(sbi, POSIX_ACL);
297 break;
298#else
Kelly Anderson4058c512013-10-07 11:36:20 +0900299 case Opt_acl:
300 f2fs_msg(sb, KERN_INFO, "acl options not supported");
301 break;
Namjae Jeon696c0182013-06-16 09:48:48 +0900302 case Opt_noacl:
303 f2fs_msg(sb, KERN_INFO, "noacl options not supported");
304 break;
305#endif
306 case Opt_active_logs:
307 if (args->from && match_int(args, &arg))
308 return -EINVAL;
309 if (arg != 2 && arg != 4 && arg != NR_CURSEG_TYPE)
310 return -EINVAL;
311 sbi->active_logs = arg;
312 break;
313 case Opt_disable_ext_identify:
314 set_opt(sbi, DISABLE_EXT_IDENTIFY);
315 break;
316 default:
317 f2fs_msg(sb, KERN_ERR,
318 "Unrecognized mount option \"%s\" or missing value",
319 p);
320 return -EINVAL;
321 }
322 }
323 return 0;
324}
325
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900326static struct inode *f2fs_alloc_inode(struct super_block *sb)
327{
328 struct f2fs_inode_info *fi;
329
330 fi = kmem_cache_alloc(f2fs_inode_cachep, GFP_NOFS | __GFP_ZERO);
331 if (!fi)
332 return NULL;
333
334 init_once((void *) fi);
335
Masanari Iida434720f2013-03-19 08:03:35 +0900336 /* Initialize f2fs-specific inode info */
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900337 fi->vfs_inode.i_version = 1;
338 atomic_set(&fi->dirty_dents, 0);
339 fi->i_current_depth = 1;
340 fi->i_advise = 0;
341 rwlock_init(&fi->ext.ext_lock);
342
343 set_inode_flag(fi, FI_NEW_INODE);
344
Jaegeuk Kim444c5802013-08-08 15:16:22 +0900345 if (test_opt(F2FS_SB(sb), INLINE_XATTR))
346 set_inode_flag(fi, FI_INLINE_XATTR);
347
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900348 return &fi->vfs_inode;
349}
350
Jaegeuk Kim531ad7d2013-04-30 11:33:27 +0900351static int f2fs_drop_inode(struct inode *inode)
352{
353 /*
354 * This is to avoid a deadlock condition like below.
355 * writeback_single_inode(inode)
356 * - f2fs_write_data_page
357 * - f2fs_gc -> iput -> evict
358 * - inode_wait_for_writeback(inode)
359 */
360 if (!inode_unhashed(inode) && inode->i_state & I_SYNC)
361 return 0;
362 return generic_drop_inode(inode);
363}
364
Jaegeuk Kimb3783872013-06-10 09:17:01 +0900365/*
366 * f2fs_dirty_inode() is called from __mark_inode_dirty()
367 *
368 * We should call set_dirty_inode to write the dirty inode through write_inode.
369 */
370static void f2fs_dirty_inode(struct inode *inode, int flags)
371{
372 set_inode_flag(F2FS_I(inode), FI_DIRTY_INODE);
Jaegeuk Kimb3783872013-06-10 09:17:01 +0900373}
374
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900375static void f2fs_i_callback(struct rcu_head *head)
376{
377 struct inode *inode = container_of(head, struct inode, i_rcu);
378 kmem_cache_free(f2fs_inode_cachep, F2FS_I(inode));
379}
380
Jaegeuk Kim25ca9232012-11-28 16:12:41 +0900381static void f2fs_destroy_inode(struct inode *inode)
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900382{
383 call_rcu(&inode->i_rcu, f2fs_i_callback);
384}
385
386static void f2fs_put_super(struct super_block *sb)
387{
388 struct f2fs_sb_info *sbi = F2FS_SB(sb);
389
Jaegeuk Kim5e176d52013-06-28 12:47:01 +0900390 if (sbi->s_proc) {
391 remove_proc_entry("segment_info", sbi->s_proc);
392 remove_proc_entry(sb->s_id, f2fs_proc_root);
393 }
Namjae Jeonb59d0ba2013-08-04 23:09:40 +0900394 kobject_del(&sbi->s_kobj);
Jaegeuk Kim5e176d52013-06-28 12:47:01 +0900395
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900396 f2fs_destroy_stats(sbi);
397 stop_gc_thread(sbi);
398
Jaegeuk Kim5887d292013-10-08 09:30:33 +0900399 /* We don't need to do checkpoint when it's clean */
400 if (sbi->s_dirty && get_pages(sbi, F2FS_DIRTY_NODES))
401 write_checkpoint(sbi, true);
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900402
403 iput(sbi->node_inode);
404 iput(sbi->meta_inode);
405
406 /* destroy f2fs internal modules */
407 destroy_node_manager(sbi);
408 destroy_segment_manager(sbi);
409
410 kfree(sbi->ckpt);
Namjae Jeonb59d0ba2013-08-04 23:09:40 +0900411 kobject_put(&sbi->s_kobj);
412 wait_for_completion(&sbi->s_kobj_unregister);
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900413
414 sb->s_fs_info = NULL;
415 brelse(sbi->raw_super_buf);
416 kfree(sbi);
417}
418
419int f2fs_sync_fs(struct super_block *sb, int sync)
420{
421 struct f2fs_sb_info *sbi = F2FS_SB(sb);
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900422
Namjae Jeona2a4a7e2013-04-20 01:28:40 +0900423 trace_f2fs_sync_fs(sb, sync);
424
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900425 if (!sbi->s_dirty && !get_pages(sbi, F2FS_DIRTY_NODES))
426 return 0;
427
Jaegeuk Kimb7473752013-04-01 08:32:21 +0900428 if (sync) {
429 mutex_lock(&sbi->gc_mutex);
Jaegeuk Kim43727522013-02-04 15:11:17 +0900430 write_checkpoint(sbi, false);
Jaegeuk Kimb7473752013-04-01 08:32:21 +0900431 mutex_unlock(&sbi->gc_mutex);
432 } else {
Jaegeuk Kim7d82db82013-01-11 13:10:49 +0900433 f2fs_balance_fs(sbi);
Jaegeuk Kimb7473752013-04-01 08:32:21 +0900434 }
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900435
Namjae Jeon64c576f2012-12-22 12:10:27 +0900436 return 0;
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900437}
438
Changman Leed6212a52013-01-29 18:30:07 +0900439static int f2fs_freeze(struct super_block *sb)
440{
441 int err;
442
Jaegeuk Kim77888c12013-05-20 20:28:47 +0900443 if (f2fs_readonly(sb))
Changman Leed6212a52013-01-29 18:30:07 +0900444 return 0;
445
446 err = f2fs_sync_fs(sb, 1);
447 return err;
448}
449
450static int f2fs_unfreeze(struct super_block *sb)
451{
452 return 0;
453}
454
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900455static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf)
456{
457 struct super_block *sb = dentry->d_sb;
458 struct f2fs_sb_info *sbi = F2FS_SB(sb);
459 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
460 block_t total_count, user_block_count, start_count, ovp_count;
461
462 total_count = le64_to_cpu(sbi->raw_super->block_count);
463 user_block_count = sbi->user_block_count;
464 start_count = le32_to_cpu(sbi->raw_super->segment0_blkaddr);
465 ovp_count = SM_I(sbi)->ovp_segments << sbi->log_blocks_per_seg;
466 buf->f_type = F2FS_SUPER_MAGIC;
467 buf->f_bsize = sbi->blocksize;
468
469 buf->f_blocks = total_count - start_count;
470 buf->f_bfree = buf->f_blocks - valid_user_blocks(sbi) - ovp_count;
471 buf->f_bavail = user_block_count - valid_user_blocks(sbi);
472
Jaegeuk Kim1362b5e2012-12-12 19:45:49 +0900473 buf->f_files = sbi->total_node_count;
474 buf->f_ffree = sbi->total_node_count - valid_inode_count(sbi);
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900475
Jaegeuk Kim5a20d332013-03-03 13:58:05 +0900476 buf->f_namelen = F2FS_NAME_LEN;
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900477 buf->f_fsid.val[0] = (u32)id;
478 buf->f_fsid.val[1] = (u32)(id >> 32);
479
480 return 0;
481}
482
483static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
484{
485 struct f2fs_sb_info *sbi = F2FS_SB(root->d_sb);
486
Namjae Jeon696c0182013-06-16 09:48:48 +0900487 if (!(root->d_sb->s_flags & MS_RDONLY) && test_opt(sbi, BG_GC))
488 seq_printf(seq, ",background_gc=%s", "on");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900489 else
Namjae Jeon696c0182013-06-16 09:48:48 +0900490 seq_printf(seq, ",background_gc=%s", "off");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900491 if (test_opt(sbi, DISABLE_ROLL_FORWARD))
492 seq_puts(seq, ",disable_roll_forward");
493 if (test_opt(sbi, DISCARD))
494 seq_puts(seq, ",discard");
495 if (test_opt(sbi, NOHEAP))
496 seq_puts(seq, ",no_heap_alloc");
497#ifdef CONFIG_F2FS_FS_XATTR
498 if (test_opt(sbi, XATTR_USER))
499 seq_puts(seq, ",user_xattr");
500 else
501 seq_puts(seq, ",nouser_xattr");
Jaegeuk Kim444c5802013-08-08 15:16:22 +0900502 if (test_opt(sbi, INLINE_XATTR))
503 seq_puts(seq, ",inline_xattr");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900504#endif
505#ifdef CONFIG_F2FS_FS_POSIX_ACL
506 if (test_opt(sbi, POSIX_ACL))
507 seq_puts(seq, ",acl");
508 else
509 seq_puts(seq, ",noacl");
510#endif
511 if (test_opt(sbi, DISABLE_EXT_IDENTIFY))
Alejandro Martinez Ruizaa435072013-01-25 19:08:59 +0100512 seq_puts(seq, ",disable_ext_identify");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900513
514 seq_printf(seq, ",active_logs=%u", sbi->active_logs);
515
516 return 0;
517}
518
Jaegeuk Kim5e176d52013-06-28 12:47:01 +0900519static int segment_info_seq_show(struct seq_file *seq, void *offset)
520{
521 struct super_block *sb = seq->private;
522 struct f2fs_sb_info *sbi = F2FS_SB(sb);
523 unsigned int total_segs = le32_to_cpu(sbi->raw_super->segment_count_main);
524 int i;
525
526 for (i = 0; i < total_segs; i++) {
527 seq_printf(seq, "%u", get_valid_blocks(sbi, i, 1));
528 if (i != 0 && (i % 10) == 0)
529 seq_puts(seq, "\n");
530 else
531 seq_puts(seq, " ");
532 }
533 return 0;
534}
535
536static int segment_info_open_fs(struct inode *inode, struct file *file)
537{
538 return single_open(file, segment_info_seq_show, PDE_DATA(inode));
539}
540
541static const struct file_operations f2fs_seq_segment_info_fops = {
542 .owner = THIS_MODULE,
543 .open = segment_info_open_fs,
544 .read = seq_read,
545 .llseek = seq_lseek,
546 .release = single_release,
547};
548
Namjae Jeon696c0182013-06-16 09:48:48 +0900549static int f2fs_remount(struct super_block *sb, int *flags, char *data)
550{
551 struct f2fs_sb_info *sbi = F2FS_SB(sb);
552 struct f2fs_mount_info org_mount_opt;
553 int err, active_logs;
554
555 /*
556 * Save the old mount options in case we
557 * need to restore them.
558 */
559 org_mount_opt = sbi->mount_opt;
560 active_logs = sbi->active_logs;
561
562 /* parse mount options */
563 err = parse_options(sb, data);
564 if (err)
565 goto restore_opts;
566
567 /*
568 * Previous and new state of filesystem is RO,
569 * so no point in checking GC conditions.
570 */
571 if ((sb->s_flags & MS_RDONLY) && (*flags & MS_RDONLY))
572 goto skip;
573
574 /*
575 * We stop the GC thread if FS is mounted as RO
576 * or if background_gc = off is passed in mount
577 * option. Also sync the filesystem.
578 */
579 if ((*flags & MS_RDONLY) || !test_opt(sbi, BG_GC)) {
580 if (sbi->gc_thread) {
581 stop_gc_thread(sbi);
582 f2fs_sync_fs(sb, 1);
583 }
584 } else if (test_opt(sbi, BG_GC) && !sbi->gc_thread) {
585 err = start_gc_thread(sbi);
586 if (err)
587 goto restore_opts;
588 }
589skip:
590 /* Update the POSIXACL Flag */
591 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
592 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
593 return 0;
594
595restore_opts:
596 sbi->mount_opt = org_mount_opt;
597 sbi->active_logs = active_logs;
598 return err;
599}
600
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900601static struct super_operations f2fs_sops = {
602 .alloc_inode = f2fs_alloc_inode,
Jaegeuk Kim531ad7d2013-04-30 11:33:27 +0900603 .drop_inode = f2fs_drop_inode,
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900604 .destroy_inode = f2fs_destroy_inode,
605 .write_inode = f2fs_write_inode,
Jaegeuk Kimb3783872013-06-10 09:17:01 +0900606 .dirty_inode = f2fs_dirty_inode,
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900607 .show_options = f2fs_show_options,
608 .evict_inode = f2fs_evict_inode,
609 .put_super = f2fs_put_super,
610 .sync_fs = f2fs_sync_fs,
Changman Leed6212a52013-01-29 18:30:07 +0900611 .freeze_fs = f2fs_freeze,
612 .unfreeze_fs = f2fs_unfreeze,
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900613 .statfs = f2fs_statfs,
Namjae Jeon696c0182013-06-16 09:48:48 +0900614 .remount_fs = f2fs_remount,
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900615};
616
617static struct inode *f2fs_nfs_get_inode(struct super_block *sb,
618 u64 ino, u32 generation)
619{
620 struct f2fs_sb_info *sbi = F2FS_SB(sb);
621 struct inode *inode;
622
623 if (ino < F2FS_ROOT_INO(sbi))
624 return ERR_PTR(-ESTALE);
625
626 /*
627 * f2fs_iget isn't quite right if the inode is currently unallocated!
628 * However f2fs_iget currently does appropriate checks to handle stale
629 * inodes so everything is OK.
630 */
631 inode = f2fs_iget(sb, ino);
632 if (IS_ERR(inode))
633 return ERR_CAST(inode);
634 if (generation && inode->i_generation != generation) {
635 /* we didn't find the right inode.. */
636 iput(inode);
637 return ERR_PTR(-ESTALE);
638 }
639 return inode;
640}
641
642static struct dentry *f2fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
643 int fh_len, int fh_type)
644{
645 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
646 f2fs_nfs_get_inode);
647}
648
649static struct dentry *f2fs_fh_to_parent(struct super_block *sb, struct fid *fid,
650 int fh_len, int fh_type)
651{
652 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
653 f2fs_nfs_get_inode);
654}
655
656static const struct export_operations f2fs_export_ops = {
657 .fh_to_dentry = f2fs_fh_to_dentry,
658 .fh_to_parent = f2fs_fh_to_parent,
659 .get_parent = f2fs_get_parent,
660};
661
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900662static loff_t max_file_size(unsigned bits)
663{
Jaegeuk Kimde936532013-08-12 21:08:03 +0900664 loff_t result = (DEF_ADDRS_PER_INODE - F2FS_INLINE_XATTR_ADDRS);
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900665 loff_t leaf_count = ADDRS_PER_BLOCK;
666
667 /* two direct node blocks */
668 result += (leaf_count * 2);
669
670 /* two indirect node blocks */
671 leaf_count *= NIDS_PER_BLOCK;
672 result += (leaf_count * 2);
673
674 /* one double indirect node block */
675 leaf_count *= NIDS_PER_BLOCK;
676 result += leaf_count;
677
678 result <<= bits;
679 return result;
680}
681
Namjae Jeona07ef782012-12-30 14:52:05 +0900682static int sanity_check_raw_super(struct super_block *sb,
683 struct f2fs_super_block *raw_super)
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900684{
685 unsigned int blocksize;
686
Namjae Jeona07ef782012-12-30 14:52:05 +0900687 if (F2FS_SUPER_MAGIC != le32_to_cpu(raw_super->magic)) {
688 f2fs_msg(sb, KERN_INFO,
689 "Magic Mismatch, valid(0x%x) - read(0x%x)",
690 F2FS_SUPER_MAGIC, le32_to_cpu(raw_super->magic));
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900691 return 1;
Namjae Jeona07ef782012-12-30 14:52:05 +0900692 }
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900693
majianpeng5c9b4692013-02-01 19:07:57 +0800694 /* Currently, support only 4KB page cache size */
695 if (F2FS_BLKSIZE != PAGE_CACHE_SIZE) {
696 f2fs_msg(sb, KERN_INFO,
majianpeng14d7e9d2013-02-01 19:07:03 +0800697 "Invalid page_cache_size (%lu), supports only 4KB\n",
majianpeng5c9b4692013-02-01 19:07:57 +0800698 PAGE_CACHE_SIZE);
699 return 1;
700 }
701
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900702 /* Currently, support only 4KB block size */
703 blocksize = 1 << le32_to_cpu(raw_super->log_blocksize);
majianpeng5c9b4692013-02-01 19:07:57 +0800704 if (blocksize != F2FS_BLKSIZE) {
Namjae Jeona07ef782012-12-30 14:52:05 +0900705 f2fs_msg(sb, KERN_INFO,
706 "Invalid blocksize (%u), supports only 4KB\n",
707 blocksize);
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900708 return 1;
Namjae Jeona07ef782012-12-30 14:52:05 +0900709 }
majianpeng5c9b4692013-02-01 19:07:57 +0800710
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900711 if (le32_to_cpu(raw_super->log_sectorsize) !=
Namjae Jeona07ef782012-12-30 14:52:05 +0900712 F2FS_LOG_SECTOR_SIZE) {
713 f2fs_msg(sb, KERN_INFO, "Invalid log sectorsize");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900714 return 1;
Namjae Jeona07ef782012-12-30 14:52:05 +0900715 }
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900716 if (le32_to_cpu(raw_super->log_sectors_per_block) !=
Namjae Jeona07ef782012-12-30 14:52:05 +0900717 F2FS_LOG_SECTORS_PER_BLOCK) {
718 f2fs_msg(sb, KERN_INFO, "Invalid log sectors per block");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900719 return 1;
Namjae Jeona07ef782012-12-30 14:52:05 +0900720 }
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900721 return 0;
722}
723
Jaegeuk Kim577e3492013-01-24 19:56:11 +0900724static int sanity_check_ckpt(struct f2fs_sb_info *sbi)
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900725{
726 unsigned int total, fsmeta;
Jaegeuk Kim577e3492013-01-24 19:56:11 +0900727 struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
728 struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900729
730 total = le32_to_cpu(raw_super->segment_count);
731 fsmeta = le32_to_cpu(raw_super->segment_count_ckpt);
732 fsmeta += le32_to_cpu(raw_super->segment_count_sit);
733 fsmeta += le32_to_cpu(raw_super->segment_count_nat);
734 fsmeta += le32_to_cpu(ckpt->rsvd_segment_count);
735 fsmeta += le32_to_cpu(raw_super->segment_count_ssa);
736
737 if (fsmeta >= total)
738 return 1;
Jaegeuk Kim577e3492013-01-24 19:56:11 +0900739
740 if (is_set_ckpt_flags(ckpt, CP_ERROR_FLAG)) {
741 f2fs_msg(sbi->sb, KERN_ERR, "A bug case: need to run fsck");
742 return 1;
743 }
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900744 return 0;
745}
746
747static void init_sb_info(struct f2fs_sb_info *sbi)
748{
749 struct f2fs_super_block *raw_super = sbi->raw_super;
750 int i;
751
752 sbi->log_sectors_per_block =
753 le32_to_cpu(raw_super->log_sectors_per_block);
754 sbi->log_blocksize = le32_to_cpu(raw_super->log_blocksize);
755 sbi->blocksize = 1 << sbi->log_blocksize;
756 sbi->log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
757 sbi->blocks_per_seg = 1 << sbi->log_blocks_per_seg;
758 sbi->segs_per_sec = le32_to_cpu(raw_super->segs_per_sec);
759 sbi->secs_per_zone = le32_to_cpu(raw_super->secs_per_zone);
760 sbi->total_sections = le32_to_cpu(raw_super->section_count);
761 sbi->total_node_count =
762 (le32_to_cpu(raw_super->segment_count_nat) / 2)
763 * sbi->blocks_per_seg * NAT_ENTRY_PER_BLOCK;
764 sbi->root_ino_num = le32_to_cpu(raw_super->root_ino);
765 sbi->node_ino_num = le32_to_cpu(raw_super->node_ino);
766 sbi->meta_ino_num = le32_to_cpu(raw_super->meta_ino);
Jaegeuk Kim5ec4e492013-03-31 13:26:03 +0900767 sbi->cur_victim_sec = NULL_SECNO;
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900768
769 for (i = 0; i < NR_COUNT_TYPE; i++)
770 atomic_set(&sbi->nr_pages[i], 0);
771}
772
Gu Zheng9076a752013-10-14 18:47:11 +0800773/*
774 * Read f2fs raw super block.
775 * Because we have two copies of super block, so read the first one at first,
776 * if the first one is invalid, move to read the second one.
777 */
778static int read_raw_super_block(struct super_block *sb,
779 struct f2fs_super_block **raw_super,
780 struct buffer_head **raw_super_buf)
majianpeng14d7e9d2013-02-01 19:07:03 +0800781{
Gu Zheng9076a752013-10-14 18:47:11 +0800782 int block = 0;
majianpeng14d7e9d2013-02-01 19:07:03 +0800783
Gu Zheng9076a752013-10-14 18:47:11 +0800784retry:
majianpeng14d7e9d2013-02-01 19:07:03 +0800785 *raw_super_buf = sb_bread(sb, block);
786 if (!*raw_super_buf) {
Gu Zheng9076a752013-10-14 18:47:11 +0800787 f2fs_msg(sb, KERN_ERR, "Unable to read %dth superblock",
788 block + 1);
789 if (block == 0) {
790 block++;
791 goto retry;
792 } else {
793 return -EIO;
794 }
majianpeng14d7e9d2013-02-01 19:07:03 +0800795 }
796
797 *raw_super = (struct f2fs_super_block *)
798 ((char *)(*raw_super_buf)->b_data + F2FS_SUPER_OFFSET);
799
800 /* sanity checking of raw super */
Gu Zheng9076a752013-10-14 18:47:11 +0800801 if (sanity_check_raw_super(sb, *raw_super)) {
802 brelse(*raw_super_buf);
803 f2fs_msg(sb, KERN_ERR, "Can't find a valid F2FS filesystem "
804 "in %dth superblock", block + 1);
805 if(block == 0) {
806 block++;
807 goto retry;
808 } else {
809 return -EINVAL;
810 }
811 }
majianpeng14d7e9d2013-02-01 19:07:03 +0800812
Gu Zheng9076a752013-10-14 18:47:11 +0800813 return 0;
majianpeng14d7e9d2013-02-01 19:07:03 +0800814}
815
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900816static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
817{
818 struct f2fs_sb_info *sbi;
819 struct f2fs_super_block *raw_super;
820 struct buffer_head *raw_super_buf;
821 struct inode *root;
822 long err = -EINVAL;
Jaegeuk Kim971767c2013-11-18 17:16:17 +0900823 int i;
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900824
825 /* allocate memory for f2fs-specific super block info */
826 sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL);
827 if (!sbi)
828 return -ENOMEM;
829
Namjae Jeonff9234a2013-01-12 14:41:13 +0900830 /* set a block size */
Namjae Jeona07ef782012-12-30 14:52:05 +0900831 if (!sb_set_blocksize(sb, F2FS_BLKSIZE)) {
832 f2fs_msg(sb, KERN_ERR, "unable to set blocksize");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900833 goto free_sbi;
Namjae Jeona07ef782012-12-30 14:52:05 +0900834 }
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900835
Gu Zheng9076a752013-10-14 18:47:11 +0800836 err = read_raw_super_block(sb, &raw_super, &raw_super_buf);
837 if (err)
838 goto free_sbi;
839
Gu Zheng5fb08372013-06-07 14:16:53 +0800840 sb->s_fs_info = sbi;
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900841 /* init some FS parameters */
842 sbi->active_logs = NR_CURSEG_TYPE;
843
844 set_opt(sbi, BG_GC);
845
846#ifdef CONFIG_F2FS_FS_XATTR
847 set_opt(sbi, XATTR_USER);
848#endif
849#ifdef CONFIG_F2FS_FS_POSIX_ACL
850 set_opt(sbi, POSIX_ACL);
851#endif
852 /* parse mount options */
Gu Zheng5fb08372013-06-07 14:16:53 +0800853 err = parse_options(sb, (char *)data);
Wei Yongjun66348b72013-04-12 10:23:18 +0800854 if (err)
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900855 goto free_sb_buf;
856
Jaegeuk Kim25ca9232012-11-28 16:12:41 +0900857 sb->s_maxbytes = max_file_size(le32_to_cpu(raw_super->log_blocksize));
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900858 sb->s_max_links = F2FS_LINK_MAX;
859 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
860
861 sb->s_op = &f2fs_sops;
862 sb->s_xattr = f2fs_xattr_handlers;
863 sb->s_export_op = &f2fs_export_ops;
864 sb->s_magic = F2FS_SUPER_MAGIC;
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900865 sb->s_time_gran = 1;
866 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
867 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
868 memcpy(sb->s_uuid, raw_super->uuid, sizeof(raw_super->uuid));
869
870 /* init f2fs-specific super block info */
871 sbi->sb = sb;
872 sbi->raw_super = raw_super;
873 sbi->raw_super_buf = raw_super_buf;
874 mutex_init(&sbi->gc_mutex);
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900875 mutex_init(&sbi->writepages);
876 mutex_init(&sbi->cp_mutex);
Jaegeuk Kim39936832012-11-22 16:21:29 +0900877 mutex_init(&sbi->node_write);
Haicheng Liaabe5132013-10-23 12:39:32 +0800878 sbi->por_doing = false;
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900879 spin_lock_init(&sbi->stat_lock);
Jaegeuk Kim971767c2013-11-18 17:16:17 +0900880
881 for (i = 0; i < NR_PAGE_TYPE; i++)
882 mutex_init(&sbi->write_mutex[i]);
883
Gu Zhenge4795562013-09-27 18:08:30 +0800884 init_rwsem(&sbi->cp_rwsem);
Changman Leefb51b5e2013-11-07 12:48:25 +0900885 init_waitqueue_head(&sbi->cp_wait);
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900886 init_sb_info(sbi);
887
888 /* get an inode for meta space */
889 sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi));
890 if (IS_ERR(sbi->meta_inode)) {
Namjae Jeona07ef782012-12-30 14:52:05 +0900891 f2fs_msg(sb, KERN_ERR, "Failed to read F2FS meta data inode");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900892 err = PTR_ERR(sbi->meta_inode);
893 goto free_sb_buf;
894 }
895
896 err = get_valid_checkpoint(sbi);
Namjae Jeona07ef782012-12-30 14:52:05 +0900897 if (err) {
898 f2fs_msg(sb, KERN_ERR, "Failed to get valid F2FS checkpoint");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900899 goto free_meta_inode;
Namjae Jeona07ef782012-12-30 14:52:05 +0900900 }
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900901
902 /* sanity checking of checkpoint */
903 err = -EINVAL;
Jaegeuk Kim577e3492013-01-24 19:56:11 +0900904 if (sanity_check_ckpt(sbi)) {
Namjae Jeona07ef782012-12-30 14:52:05 +0900905 f2fs_msg(sb, KERN_ERR, "Invalid F2FS checkpoint");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900906 goto free_cp;
Namjae Jeona07ef782012-12-30 14:52:05 +0900907 }
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900908
909 sbi->total_valid_node_count =
910 le32_to_cpu(sbi->ckpt->valid_node_count);
911 sbi->total_valid_inode_count =
912 le32_to_cpu(sbi->ckpt->valid_inode_count);
913 sbi->user_block_count = le64_to_cpu(sbi->ckpt->user_block_count);
914 sbi->total_valid_block_count =
915 le64_to_cpu(sbi->ckpt->valid_block_count);
916 sbi->last_valid_block_count = sbi->total_valid_block_count;
917 sbi->alloc_valid_block_count = 0;
918 INIT_LIST_HEAD(&sbi->dir_inode_list);
919 spin_lock_init(&sbi->dir_inode_lock);
920
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900921 init_orphan_info(sbi);
922
923 /* setup f2fs internal modules */
924 err = build_segment_manager(sbi);
Namjae Jeona07ef782012-12-30 14:52:05 +0900925 if (err) {
926 f2fs_msg(sb, KERN_ERR,
927 "Failed to initialize F2FS segment manager");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900928 goto free_sm;
Namjae Jeona07ef782012-12-30 14:52:05 +0900929 }
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900930 err = build_node_manager(sbi);
Namjae Jeona07ef782012-12-30 14:52:05 +0900931 if (err) {
932 f2fs_msg(sb, KERN_ERR,
933 "Failed to initialize F2FS node manager");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900934 goto free_nm;
Namjae Jeona07ef782012-12-30 14:52:05 +0900935 }
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900936
937 build_gc_manager(sbi);
938
939 /* get an inode for node space */
940 sbi->node_inode = f2fs_iget(sb, F2FS_NODE_INO(sbi));
941 if (IS_ERR(sbi->node_inode)) {
Namjae Jeona07ef782012-12-30 14:52:05 +0900942 f2fs_msg(sb, KERN_ERR, "Failed to read node inode");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900943 err = PTR_ERR(sbi->node_inode);
944 goto free_nm;
945 }
946
947 /* if there are nt orphan nodes free them */
948 err = -EINVAL;
Jaegeuk Kim30f0c752012-12-19 16:09:19 +0900949 if (recover_orphan_inodes(sbi))
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900950 goto free_node_inode;
951
952 /* read root inode and dentry */
953 root = f2fs_iget(sb, F2FS_ROOT_INO(sbi));
954 if (IS_ERR(root)) {
Namjae Jeona07ef782012-12-30 14:52:05 +0900955 f2fs_msg(sb, KERN_ERR, "Failed to read root inode");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900956 err = PTR_ERR(root);
957 goto free_node_inode;
958 }
959 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size)
960 goto free_root_inode;
961
962 sb->s_root = d_make_root(root); /* allocate root dentry */
963 if (!sb->s_root) {
964 err = -ENOMEM;
965 goto free_root_inode;
966 }
967
968 /* recover fsynced data */
Jaegeuk Kim6ead1142013-03-20 19:01:06 +0900969 if (!test_opt(sbi, DISABLE_ROLL_FORWARD)) {
970 err = recover_fsync_data(sbi);
Chris Friesbde582b2013-05-02 16:07:34 -0500971 if (err)
972 f2fs_msg(sb, KERN_ERR,
973 "Cannot recover all fsync data errno=%ld", err);
Jaegeuk Kim6ead1142013-03-20 19:01:06 +0900974 }
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900975
Namjae Jeon696c0182013-06-16 09:48:48 +0900976 /*
977 * If filesystem is not mounted as read-only then
978 * do start the gc_thread.
979 */
980 if (!(sb->s_flags & MS_RDONLY)) {
981 /* After POR, we can run background GC thread.*/
982 err = start_gc_thread(sbi);
983 if (err)
Chao Yu1d15bd22013-11-07 10:14:51 +0800984 goto free_gc;
Namjae Jeon696c0182013-06-16 09:48:48 +0900985 }
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900986
987 err = f2fs_build_stats(sbi);
988 if (err)
Chao Yu1d15bd22013-11-07 10:14:51 +0800989 goto free_gc;
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900990
Jaegeuk Kim5e176d52013-06-28 12:47:01 +0900991 if (f2fs_proc_root)
992 sbi->s_proc = proc_mkdir(sb->s_id, f2fs_proc_root);
993
994 if (sbi->s_proc)
995 proc_create_data("segment_info", S_IRUGO, sbi->s_proc,
996 &f2fs_seq_segment_info_fops, sb);
997
Namjae Jeond3ee4562013-03-17 17:26:14 +0900998 if (test_opt(sbi, DISCARD)) {
999 struct request_queue *q = bdev_get_queue(sb->s_bdev);
1000 if (!blk_queue_discard(q))
1001 f2fs_msg(sb, KERN_WARNING,
1002 "mounting with \"discard\" option, but "
1003 "the device does not support discard");
1004 }
1005
Namjae Jeonb59d0ba2013-08-04 23:09:40 +09001006 sbi->s_kobj.kset = f2fs_kset;
1007 init_completion(&sbi->s_kobj_unregister);
1008 err = kobject_init_and_add(&sbi->s_kobj, &f2fs_ktype, NULL,
1009 "%s", sb->s_id);
1010 if (err)
1011 goto fail;
1012
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09001013 return 0;
1014fail:
Chao Yu1d15bd22013-11-07 10:14:51 +08001015 if (sbi->s_proc) {
1016 remove_proc_entry("segment_info", sbi->s_proc);
1017 remove_proc_entry(sb->s_id, f2fs_proc_root);
1018 }
1019 f2fs_destroy_stats(sbi);
1020free_gc:
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09001021 stop_gc_thread(sbi);
1022free_root_inode:
1023 dput(sb->s_root);
1024 sb->s_root = NULL;
1025free_node_inode:
1026 iput(sbi->node_inode);
1027free_nm:
1028 destroy_node_manager(sbi);
1029free_sm:
1030 destroy_segment_manager(sbi);
1031free_cp:
1032 kfree(sbi->ckpt);
1033free_meta_inode:
1034 make_bad_inode(sbi->meta_inode);
1035 iput(sbi->meta_inode);
1036free_sb_buf:
1037 brelse(raw_super_buf);
1038free_sbi:
1039 kfree(sbi);
1040 return err;
1041}
1042
1043static struct dentry *f2fs_mount(struct file_system_type *fs_type, int flags,
1044 const char *dev_name, void *data)
1045{
1046 return mount_bdev(fs_type, flags, dev_name, data, f2fs_fill_super);
1047}
1048
1049static struct file_system_type f2fs_fs_type = {
1050 .owner = THIS_MODULE,
1051 .name = "f2fs",
1052 .mount = f2fs_mount,
1053 .kill_sb = kill_block_super,
1054 .fs_flags = FS_REQUIRES_DEV,
1055};
Eric W. Biederman7f78e032013-03-02 19:39:14 -08001056MODULE_ALIAS_FS("f2fs");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09001057
Namjae Jeon6e6093a2013-01-17 00:08:30 +09001058static int __init init_inodecache(void)
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09001059{
1060 f2fs_inode_cachep = f2fs_kmem_cache_create("f2fs_inode_cache",
1061 sizeof(struct f2fs_inode_info), NULL);
1062 if (f2fs_inode_cachep == NULL)
1063 return -ENOMEM;
1064 return 0;
1065}
1066
1067static void destroy_inodecache(void)
1068{
1069 /*
1070 * Make sure all delayed rcu free inodes are flushed before we
1071 * destroy cache.
1072 */
1073 rcu_barrier();
1074 kmem_cache_destroy(f2fs_inode_cachep);
1075}
1076
1077static int __init init_f2fs_fs(void)
1078{
1079 int err;
1080
1081 err = init_inodecache();
1082 if (err)
1083 goto fail;
1084 err = create_node_manager_caches();
1085 if (err)
Zhao Hongjiang9890ff32013-08-20 16:49:51 +08001086 goto free_inodecache;
Jaegeuk Kim7fd9e542013-11-15 13:55:58 +09001087 err = create_segment_manager_caches();
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09001088 if (err)
Zhao Hongjiang9890ff32013-08-20 16:49:51 +08001089 goto free_node_manager_caches;
Jaegeuk Kim7fd9e542013-11-15 13:55:58 +09001090 err = create_gc_caches();
1091 if (err)
1092 goto free_segment_manager_caches;
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09001093 err = create_checkpoint_caches();
1094 if (err)
Zhao Hongjiang9890ff32013-08-20 16:49:51 +08001095 goto free_gc_caches;
Namjae Jeonb59d0ba2013-08-04 23:09:40 +09001096 f2fs_kset = kset_create_and_add("f2fs", NULL, fs_kobj);
Wei Yongjun6e6b9782013-08-23 08:30:20 +08001097 if (!f2fs_kset) {
1098 err = -ENOMEM;
Zhao Hongjiang9890ff32013-08-20 16:49:51 +08001099 goto free_checkpoint_caches;
Wei Yongjun6e6b9782013-08-23 08:30:20 +08001100 }
Namjae Jeon4589d252013-01-15 19:58:47 +09001101 err = register_filesystem(&f2fs_fs_type);
1102 if (err)
Zhao Hongjiang9890ff32013-08-20 16:49:51 +08001103 goto free_kset;
Namjae Jeon4589d252013-01-15 19:58:47 +09001104 f2fs_create_root_stats();
Jaegeuk Kim5e176d52013-06-28 12:47:01 +09001105 f2fs_proc_root = proc_mkdir("fs/f2fs", NULL);
Zhao Hongjiang9890ff32013-08-20 16:49:51 +08001106 return 0;
1107
1108free_kset:
1109 kset_unregister(f2fs_kset);
1110free_checkpoint_caches:
1111 destroy_checkpoint_caches();
1112free_gc_caches:
1113 destroy_gc_caches();
Jaegeuk Kim7fd9e542013-11-15 13:55:58 +09001114free_segment_manager_caches:
1115 destroy_segment_manager_caches();
Zhao Hongjiang9890ff32013-08-20 16:49:51 +08001116free_node_manager_caches:
1117 destroy_node_manager_caches();
1118free_inodecache:
1119 destroy_inodecache();
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09001120fail:
1121 return err;
1122}
1123
1124static void __exit exit_f2fs_fs(void)
1125{
Jaegeuk Kim5e176d52013-06-28 12:47:01 +09001126 remove_proc_entry("fs/f2fs", NULL);
Namjae Jeon4589d252013-01-15 19:58:47 +09001127 f2fs_destroy_root_stats();
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09001128 unregister_filesystem(&f2fs_fs_type);
1129 destroy_checkpoint_caches();
1130 destroy_gc_caches();
1131 destroy_node_manager_caches();
1132 destroy_inodecache();
Namjae Jeonb59d0ba2013-08-04 23:09:40 +09001133 kset_unregister(f2fs_kset);
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09001134}
1135
1136module_init(init_f2fs_fs)
1137module_exit(exit_f2fs_fs)
1138
1139MODULE_AUTHOR("Samsung Electronics's Praesto Team");
1140MODULE_DESCRIPTION("Flash Friendly File System");
1141MODULE_LICENSE("GPL");