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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,
Huajun Li8274de72013-11-10 23:13:17 +080053 Opt_inline_data,
Jaegeuk Kimaff063e2012-11-02 17:07:47 +090054 Opt_err,
55};
56
57static match_table_t f2fs_tokens = {
Namjae Jeon696c0182013-06-16 09:48:48 +090058 {Opt_gc_background, "background_gc=%s"},
Jaegeuk Kimaff063e2012-11-02 17:07:47 +090059 {Opt_disable_roll_forward, "disable_roll_forward"},
60 {Opt_discard, "discard"},
61 {Opt_noheap, "no_heap"},
Kelly Anderson4058c512013-10-07 11:36:20 +090062 {Opt_user_xattr, "user_xattr"},
Jaegeuk Kimaff063e2012-11-02 17:07:47 +090063 {Opt_nouser_xattr, "nouser_xattr"},
Kelly Anderson4058c512013-10-07 11:36:20 +090064 {Opt_acl, "acl"},
Jaegeuk Kimaff063e2012-11-02 17:07:47 +090065 {Opt_noacl, "noacl"},
66 {Opt_active_logs, "active_logs=%u"},
67 {Opt_disable_ext_identify, "disable_ext_identify"},
Jaegeuk Kim444c5802013-08-08 15:16:22 +090068 {Opt_inline_xattr, "inline_xattr"},
Huajun Li8274de72013-11-10 23:13:17 +080069 {Opt_inline_data, "inline_data"},
Jaegeuk Kimaff063e2012-11-02 17:07:47 +090070 {Opt_err, NULL},
71};
72
Namjae Jeonb59d0ba2013-08-04 23:09:40 +090073/* Sysfs support for f2fs */
Jaegeuk Kimea91e9b2013-10-24 15:49:07 +090074enum {
75 GC_THREAD, /* struct f2fs_gc_thread */
76 SM_INFO, /* struct f2fs_sm_info */
Jaegeuk Kimb1c57c12014-01-08 13:45:08 +090077 F2FS_SBI, /* struct f2fs_sb_info */
Jaegeuk Kimea91e9b2013-10-24 15:49:07 +090078};
79
Namjae Jeonb59d0ba2013-08-04 23:09:40 +090080struct f2fs_attr {
81 struct attribute attr;
82 ssize_t (*show)(struct f2fs_attr *, struct f2fs_sb_info *, char *);
83 ssize_t (*store)(struct f2fs_attr *, struct f2fs_sb_info *,
84 const char *, size_t);
Jaegeuk Kimea91e9b2013-10-24 15:49:07 +090085 int struct_type;
Namjae Jeonb59d0ba2013-08-04 23:09:40 +090086 int offset;
87};
88
Jaegeuk Kimea91e9b2013-10-24 15:49:07 +090089static unsigned char *__struct_ptr(struct f2fs_sb_info *sbi, int struct_type)
90{
91 if (struct_type == GC_THREAD)
92 return (unsigned char *)sbi->gc_thread;
93 else if (struct_type == SM_INFO)
94 return (unsigned char *)SM_I(sbi);
Jaegeuk Kimb1c57c12014-01-08 13:45:08 +090095 else if (struct_type == F2FS_SBI)
96 return (unsigned char *)sbi;
Jaegeuk Kimea91e9b2013-10-24 15:49:07 +090097 return NULL;
98}
99
Namjae Jeonb59d0ba2013-08-04 23:09:40 +0900100static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
101 struct f2fs_sb_info *sbi, char *buf)
102{
Jaegeuk Kimea91e9b2013-10-24 15:49:07 +0900103 unsigned char *ptr = NULL;
Namjae Jeonb59d0ba2013-08-04 23:09:40 +0900104 unsigned int *ui;
105
Jaegeuk Kimea91e9b2013-10-24 15:49:07 +0900106 ptr = __struct_ptr(sbi, a->struct_type);
107 if (!ptr)
Namjae Jeonb59d0ba2013-08-04 23:09:40 +0900108 return -EINVAL;
109
Jaegeuk Kimea91e9b2013-10-24 15:49:07 +0900110 ui = (unsigned int *)(ptr + a->offset);
Namjae Jeonb59d0ba2013-08-04 23:09:40 +0900111
112 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
113}
114
115static ssize_t f2fs_sbi_store(struct f2fs_attr *a,
116 struct f2fs_sb_info *sbi,
117 const char *buf, size_t count)
118{
Jaegeuk Kimea91e9b2013-10-24 15:49:07 +0900119 unsigned char *ptr;
Namjae Jeonb59d0ba2013-08-04 23:09:40 +0900120 unsigned long t;
121 unsigned int *ui;
122 ssize_t ret;
123
Jaegeuk Kimea91e9b2013-10-24 15:49:07 +0900124 ptr = __struct_ptr(sbi, a->struct_type);
125 if (!ptr)
Namjae Jeonb59d0ba2013-08-04 23:09:40 +0900126 return -EINVAL;
127
Jaegeuk Kimea91e9b2013-10-24 15:49:07 +0900128 ui = (unsigned int *)(ptr + a->offset);
Namjae Jeonb59d0ba2013-08-04 23:09:40 +0900129
130 ret = kstrtoul(skip_spaces(buf), 0, &t);
131 if (ret < 0)
132 return ret;
133 *ui = t;
134 return count;
135}
136
137static ssize_t f2fs_attr_show(struct kobject *kobj,
138 struct attribute *attr, char *buf)
139{
140 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
141 s_kobj);
142 struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
143
144 return a->show ? a->show(a, sbi, buf) : 0;
145}
146
147static ssize_t f2fs_attr_store(struct kobject *kobj, struct attribute *attr,
148 const char *buf, size_t len)
149{
150 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
151 s_kobj);
152 struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
153
154 return a->store ? a->store(a, sbi, buf, len) : 0;
155}
156
157static void f2fs_sb_release(struct kobject *kobj)
158{
159 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
160 s_kobj);
161 complete(&sbi->s_kobj_unregister);
162}
163
Jaegeuk Kimea91e9b2013-10-24 15:49:07 +0900164#define F2FS_ATTR_OFFSET(_struct_type, _name, _mode, _show, _store, _offset) \
Namjae Jeonb59d0ba2013-08-04 23:09:40 +0900165static struct f2fs_attr f2fs_attr_##_name = { \
166 .attr = {.name = __stringify(_name), .mode = _mode }, \
167 .show = _show, \
168 .store = _store, \
Jaegeuk Kimea91e9b2013-10-24 15:49:07 +0900169 .struct_type = _struct_type, \
170 .offset = _offset \
Namjae Jeonb59d0ba2013-08-04 23:09:40 +0900171}
172
Jaegeuk Kimea91e9b2013-10-24 15:49:07 +0900173#define F2FS_RW_ATTR(struct_type, struct_name, name, elname) \
174 F2FS_ATTR_OFFSET(struct_type, name, 0644, \
175 f2fs_sbi_show, f2fs_sbi_store, \
176 offsetof(struct struct_name, elname))
Namjae Jeonb59d0ba2013-08-04 23:09:40 +0900177
Jaegeuk Kimea91e9b2013-10-24 15:49:07 +0900178F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_min_sleep_time, min_sleep_time);
179F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_max_sleep_time, max_sleep_time);
180F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_no_gc_sleep_time, no_gc_sleep_time);
181F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_idle, gc_idle);
182F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, reclaim_segments, rec_prefree_segments);
Jaegeuk Kim7ac8c3b2013-11-12 15:00:38 +0900183F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, max_small_discards, max_discards);
Jaegeuk Kim216fbd62013-11-07 13:13:42 +0900184F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, ipu_policy, ipu_policy);
185F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ipu_util, min_ipu_util);
Jaegeuk Kimb1c57c12014-01-08 13:45:08 +0900186F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, max_victim_search, max_victim_search);
Jaegeuk Kimab9fa662014-02-27 20:09:05 +0900187F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, dir_level, dir_level);
Namjae Jeonb59d0ba2013-08-04 23:09:40 +0900188
189#define ATTR_LIST(name) (&f2fs_attr_##name.attr)
190static struct attribute *f2fs_attrs[] = {
191 ATTR_LIST(gc_min_sleep_time),
192 ATTR_LIST(gc_max_sleep_time),
193 ATTR_LIST(gc_no_gc_sleep_time),
Namjae Jeond2dc0952013-08-04 23:10:15 +0900194 ATTR_LIST(gc_idle),
Jaegeuk Kimea91e9b2013-10-24 15:49:07 +0900195 ATTR_LIST(reclaim_segments),
Jaegeuk Kim7ac8c3b2013-11-12 15:00:38 +0900196 ATTR_LIST(max_small_discards),
Jaegeuk Kim216fbd62013-11-07 13:13:42 +0900197 ATTR_LIST(ipu_policy),
198 ATTR_LIST(min_ipu_util),
Jaegeuk Kimb1c57c12014-01-08 13:45:08 +0900199 ATTR_LIST(max_victim_search),
Jaegeuk Kimab9fa662014-02-27 20:09:05 +0900200 ATTR_LIST(dir_level),
Namjae Jeonb59d0ba2013-08-04 23:09:40 +0900201 NULL,
202};
203
204static const struct sysfs_ops f2fs_attr_ops = {
205 .show = f2fs_attr_show,
206 .store = f2fs_attr_store,
207};
208
209static struct kobj_type f2fs_ktype = {
210 .default_attrs = f2fs_attrs,
211 .sysfs_ops = &f2fs_attr_ops,
212 .release = f2fs_sb_release,
213};
214
Namjae Jeona07ef782012-12-30 14:52:05 +0900215void f2fs_msg(struct super_block *sb, const char *level, const char *fmt, ...)
216{
217 struct va_format vaf;
218 va_list args;
219
220 va_start(args, fmt);
221 vaf.fmt = fmt;
222 vaf.va = &args;
223 printk("%sF2FS-fs (%s): %pV\n", level, sb->s_id, &vaf);
224 va_end(args);
225}
226
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900227static void init_once(void *foo)
228{
229 struct f2fs_inode_info *fi = (struct f2fs_inode_info *) foo;
230
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900231 inode_init_once(&fi->vfs_inode);
232}
233
Namjae Jeon696c0182013-06-16 09:48:48 +0900234static int parse_options(struct super_block *sb, char *options)
235{
236 struct f2fs_sb_info *sbi = F2FS_SB(sb);
237 substring_t args[MAX_OPT_ARGS];
238 char *p, *name;
239 int arg = 0;
240
241 if (!options)
242 return 0;
243
244 while ((p = strsep(&options, ",")) != NULL) {
245 int token;
246 if (!*p)
247 continue;
248 /*
249 * Initialize args struct so we know whether arg was
250 * found; some options take optional arguments.
251 */
252 args[0].to = args[0].from = NULL;
253 token = match_token(p, f2fs_tokens, args);
254
255 switch (token) {
256 case Opt_gc_background:
257 name = match_strdup(&args[0]);
258
259 if (!name)
260 return -ENOMEM;
261 if (!strncmp(name, "on", 2))
262 set_opt(sbi, BG_GC);
263 else if (!strncmp(name, "off", 3))
264 clear_opt(sbi, BG_GC);
265 else {
266 kfree(name);
267 return -EINVAL;
268 }
269 kfree(name);
270 break;
271 case Opt_disable_roll_forward:
272 set_opt(sbi, DISABLE_ROLL_FORWARD);
273 break;
274 case Opt_discard:
275 set_opt(sbi, DISCARD);
276 break;
277 case Opt_noheap:
278 set_opt(sbi, NOHEAP);
279 break;
280#ifdef CONFIG_F2FS_FS_XATTR
Kelly Anderson4058c512013-10-07 11:36:20 +0900281 case Opt_user_xattr:
282 set_opt(sbi, XATTR_USER);
283 break;
Namjae Jeon696c0182013-06-16 09:48:48 +0900284 case Opt_nouser_xattr:
285 clear_opt(sbi, XATTR_USER);
286 break;
Jaegeuk Kim444c5802013-08-08 15:16:22 +0900287 case Opt_inline_xattr:
288 set_opt(sbi, INLINE_XATTR);
289 break;
Namjae Jeon696c0182013-06-16 09:48:48 +0900290#else
Kelly Anderson4058c512013-10-07 11:36:20 +0900291 case Opt_user_xattr:
292 f2fs_msg(sb, KERN_INFO,
293 "user_xattr options not supported");
294 break;
Namjae Jeon696c0182013-06-16 09:48:48 +0900295 case Opt_nouser_xattr:
296 f2fs_msg(sb, KERN_INFO,
297 "nouser_xattr options not supported");
298 break;
Jaegeuk Kim444c5802013-08-08 15:16:22 +0900299 case Opt_inline_xattr:
300 f2fs_msg(sb, KERN_INFO,
301 "inline_xattr options not supported");
302 break;
Namjae Jeon696c0182013-06-16 09:48:48 +0900303#endif
304#ifdef CONFIG_F2FS_FS_POSIX_ACL
Kelly Anderson4058c512013-10-07 11:36:20 +0900305 case Opt_acl:
306 set_opt(sbi, POSIX_ACL);
307 break;
Namjae Jeon696c0182013-06-16 09:48:48 +0900308 case Opt_noacl:
309 clear_opt(sbi, POSIX_ACL);
310 break;
311#else
Kelly Anderson4058c512013-10-07 11:36:20 +0900312 case Opt_acl:
313 f2fs_msg(sb, KERN_INFO, "acl options not supported");
314 break;
Namjae Jeon696c0182013-06-16 09:48:48 +0900315 case Opt_noacl:
316 f2fs_msg(sb, KERN_INFO, "noacl options not supported");
317 break;
318#endif
319 case Opt_active_logs:
320 if (args->from && match_int(args, &arg))
321 return -EINVAL;
322 if (arg != 2 && arg != 4 && arg != NR_CURSEG_TYPE)
323 return -EINVAL;
324 sbi->active_logs = arg;
325 break;
326 case Opt_disable_ext_identify:
327 set_opt(sbi, DISABLE_EXT_IDENTIFY);
328 break;
Huajun Li8274de72013-11-10 23:13:17 +0800329 case Opt_inline_data:
330 set_opt(sbi, INLINE_DATA);
331 break;
Namjae Jeon696c0182013-06-16 09:48:48 +0900332 default:
333 f2fs_msg(sb, KERN_ERR,
334 "Unrecognized mount option \"%s\" or missing value",
335 p);
336 return -EINVAL;
337 }
338 }
339 return 0;
340}
341
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900342static struct inode *f2fs_alloc_inode(struct super_block *sb)
343{
344 struct f2fs_inode_info *fi;
345
Chao Yua0acdfe2013-12-05 09:54:00 +0800346 fi = kmem_cache_alloc(f2fs_inode_cachep, GFP_F2FS_ZERO);
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900347 if (!fi)
348 return NULL;
349
350 init_once((void *) fi);
351
Masanari Iida434720f2013-03-19 08:03:35 +0900352 /* Initialize f2fs-specific inode info */
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900353 fi->vfs_inode.i_version = 1;
354 atomic_set(&fi->dirty_dents, 0);
355 fi->i_current_depth = 1;
356 fi->i_advise = 0;
357 rwlock_init(&fi->ext.ext_lock);
358
359 set_inode_flag(fi, FI_NEW_INODE);
360
Jaegeuk Kim444c5802013-08-08 15:16:22 +0900361 if (test_opt(F2FS_SB(sb), INLINE_XATTR))
362 set_inode_flag(fi, FI_INLINE_XATTR);
363
Jaegeuk Kimab9fa662014-02-27 20:09:05 +0900364 /* Will be used by directory only */
365 fi->i_dir_level = F2FS_SB(sb)->dir_level;
366
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900367 return &fi->vfs_inode;
368}
369
Jaegeuk Kim531ad7d2013-04-30 11:33:27 +0900370static int f2fs_drop_inode(struct inode *inode)
371{
372 /*
373 * This is to avoid a deadlock condition like below.
374 * writeback_single_inode(inode)
375 * - f2fs_write_data_page
376 * - f2fs_gc -> iput -> evict
377 * - inode_wait_for_writeback(inode)
378 */
379 if (!inode_unhashed(inode) && inode->i_state & I_SYNC)
380 return 0;
381 return generic_drop_inode(inode);
382}
383
Jaegeuk Kimb3783872013-06-10 09:17:01 +0900384/*
385 * f2fs_dirty_inode() is called from __mark_inode_dirty()
386 *
387 * We should call set_dirty_inode to write the dirty inode through write_inode.
388 */
389static void f2fs_dirty_inode(struct inode *inode, int flags)
390{
391 set_inode_flag(F2FS_I(inode), FI_DIRTY_INODE);
Jaegeuk Kimb3783872013-06-10 09:17:01 +0900392}
393
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900394static void f2fs_i_callback(struct rcu_head *head)
395{
396 struct inode *inode = container_of(head, struct inode, i_rcu);
397 kmem_cache_free(f2fs_inode_cachep, F2FS_I(inode));
398}
399
Jaegeuk Kim25ca9232012-11-28 16:12:41 +0900400static void f2fs_destroy_inode(struct inode *inode)
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900401{
402 call_rcu(&inode->i_rcu, f2fs_i_callback);
403}
404
405static void f2fs_put_super(struct super_block *sb)
406{
407 struct f2fs_sb_info *sbi = F2FS_SB(sb);
408
Jaegeuk Kim5e176d52013-06-28 12:47:01 +0900409 if (sbi->s_proc) {
410 remove_proc_entry("segment_info", sbi->s_proc);
411 remove_proc_entry(sb->s_id, f2fs_proc_root);
412 }
Namjae Jeonb59d0ba2013-08-04 23:09:40 +0900413 kobject_del(&sbi->s_kobj);
Jaegeuk Kim5e176d52013-06-28 12:47:01 +0900414
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900415 f2fs_destroy_stats(sbi);
416 stop_gc_thread(sbi);
417
Jaegeuk Kim5887d292013-10-08 09:30:33 +0900418 /* We don't need to do checkpoint when it's clean */
419 if (sbi->s_dirty && get_pages(sbi, F2FS_DIRTY_NODES))
420 write_checkpoint(sbi, true);
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900421
422 iput(sbi->node_inode);
423 iput(sbi->meta_inode);
424
425 /* destroy f2fs internal modules */
426 destroy_node_manager(sbi);
427 destroy_segment_manager(sbi);
428
429 kfree(sbi->ckpt);
Namjae Jeonb59d0ba2013-08-04 23:09:40 +0900430 kobject_put(&sbi->s_kobj);
431 wait_for_completion(&sbi->s_kobj_unregister);
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900432
433 sb->s_fs_info = NULL;
434 brelse(sbi->raw_super_buf);
435 kfree(sbi);
436}
437
438int f2fs_sync_fs(struct super_block *sb, int sync)
439{
440 struct f2fs_sb_info *sbi = F2FS_SB(sb);
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900441
Namjae Jeona2a4a7e2013-04-20 01:28:40 +0900442 trace_f2fs_sync_fs(sb, sync);
443
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900444 if (!sbi->s_dirty && !get_pages(sbi, F2FS_DIRTY_NODES))
445 return 0;
446
Jaegeuk Kimb7473752013-04-01 08:32:21 +0900447 if (sync) {
448 mutex_lock(&sbi->gc_mutex);
Jaegeuk Kim43727522013-02-04 15:11:17 +0900449 write_checkpoint(sbi, false);
Jaegeuk Kimb7473752013-04-01 08:32:21 +0900450 mutex_unlock(&sbi->gc_mutex);
451 } else {
Jaegeuk Kim7d82db82013-01-11 13:10:49 +0900452 f2fs_balance_fs(sbi);
Jaegeuk Kimb7473752013-04-01 08:32:21 +0900453 }
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900454
Namjae Jeon64c576f2012-12-22 12:10:27 +0900455 return 0;
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900456}
457
Changman Leed6212a52013-01-29 18:30:07 +0900458static int f2fs_freeze(struct super_block *sb)
459{
460 int err;
461
Jaegeuk Kim77888c12013-05-20 20:28:47 +0900462 if (f2fs_readonly(sb))
Changman Leed6212a52013-01-29 18:30:07 +0900463 return 0;
464
465 err = f2fs_sync_fs(sb, 1);
466 return err;
467}
468
469static int f2fs_unfreeze(struct super_block *sb)
470{
471 return 0;
472}
473
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900474static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf)
475{
476 struct super_block *sb = dentry->d_sb;
477 struct f2fs_sb_info *sbi = F2FS_SB(sb);
478 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
479 block_t total_count, user_block_count, start_count, ovp_count;
480
481 total_count = le64_to_cpu(sbi->raw_super->block_count);
482 user_block_count = sbi->user_block_count;
483 start_count = le32_to_cpu(sbi->raw_super->segment0_blkaddr);
484 ovp_count = SM_I(sbi)->ovp_segments << sbi->log_blocks_per_seg;
485 buf->f_type = F2FS_SUPER_MAGIC;
486 buf->f_bsize = sbi->blocksize;
487
488 buf->f_blocks = total_count - start_count;
489 buf->f_bfree = buf->f_blocks - valid_user_blocks(sbi) - ovp_count;
490 buf->f_bavail = user_block_count - valid_user_blocks(sbi);
491
Jaegeuk Kim1362b5e2012-12-12 19:45:49 +0900492 buf->f_files = sbi->total_node_count;
493 buf->f_ffree = sbi->total_node_count - valid_inode_count(sbi);
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900494
Jaegeuk Kim5a20d332013-03-03 13:58:05 +0900495 buf->f_namelen = F2FS_NAME_LEN;
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900496 buf->f_fsid.val[0] = (u32)id;
497 buf->f_fsid.val[1] = (u32)(id >> 32);
498
499 return 0;
500}
501
502static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
503{
504 struct f2fs_sb_info *sbi = F2FS_SB(root->d_sb);
505
Namjae Jeon696c0182013-06-16 09:48:48 +0900506 if (!(root->d_sb->s_flags & MS_RDONLY) && test_opt(sbi, BG_GC))
507 seq_printf(seq, ",background_gc=%s", "on");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900508 else
Namjae Jeon696c0182013-06-16 09:48:48 +0900509 seq_printf(seq, ",background_gc=%s", "off");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900510 if (test_opt(sbi, DISABLE_ROLL_FORWARD))
511 seq_puts(seq, ",disable_roll_forward");
512 if (test_opt(sbi, DISCARD))
513 seq_puts(seq, ",discard");
514 if (test_opt(sbi, NOHEAP))
515 seq_puts(seq, ",no_heap_alloc");
516#ifdef CONFIG_F2FS_FS_XATTR
517 if (test_opt(sbi, XATTR_USER))
518 seq_puts(seq, ",user_xattr");
519 else
520 seq_puts(seq, ",nouser_xattr");
Jaegeuk Kim444c5802013-08-08 15:16:22 +0900521 if (test_opt(sbi, INLINE_XATTR))
522 seq_puts(seq, ",inline_xattr");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900523#endif
524#ifdef CONFIG_F2FS_FS_POSIX_ACL
525 if (test_opt(sbi, POSIX_ACL))
526 seq_puts(seq, ",acl");
527 else
528 seq_puts(seq, ",noacl");
529#endif
530 if (test_opt(sbi, DISABLE_EXT_IDENTIFY))
Alejandro Martinez Ruizaa435072013-01-25 19:08:59 +0100531 seq_puts(seq, ",disable_ext_identify");
Huajun Li8274de72013-11-10 23:13:17 +0800532 if (test_opt(sbi, INLINE_DATA))
533 seq_puts(seq, ",inline_data");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900534 seq_printf(seq, ",active_logs=%u", sbi->active_logs);
535
536 return 0;
537}
538
Jaegeuk Kim5e176d52013-06-28 12:47:01 +0900539static int segment_info_seq_show(struct seq_file *seq, void *offset)
540{
541 struct super_block *sb = seq->private;
542 struct f2fs_sb_info *sbi = F2FS_SB(sb);
Chris Fries6c311ec2014-01-17 14:44:39 -0600543 unsigned int total_segs =
544 le32_to_cpu(sbi->raw_super->segment_count_main);
Jaegeuk Kim5e176d52013-06-28 12:47:01 +0900545 int i;
546
547 for (i = 0; i < total_segs; i++) {
548 seq_printf(seq, "%u", get_valid_blocks(sbi, i, 1));
Gu Zheng46c04362014-03-07 18:43:33 +0800549 if ((i % 10) == 9 || i == (total_segs - 1))
550 seq_putc(seq, '\n');
Jaegeuk Kim5e176d52013-06-28 12:47:01 +0900551 else
Gu Zheng46c04362014-03-07 18:43:33 +0800552 seq_putc(seq, ' ');
Jaegeuk Kim5e176d52013-06-28 12:47:01 +0900553 }
Gu Zheng46c04362014-03-07 18:43:33 +0800554
Jaegeuk Kim5e176d52013-06-28 12:47:01 +0900555 return 0;
556}
557
558static int segment_info_open_fs(struct inode *inode, struct file *file)
559{
560 return single_open(file, segment_info_seq_show, PDE_DATA(inode));
561}
562
563static const struct file_operations f2fs_seq_segment_info_fops = {
564 .owner = THIS_MODULE,
565 .open = segment_info_open_fs,
566 .read = seq_read,
567 .llseek = seq_lseek,
568 .release = single_release,
569};
570
Namjae Jeon696c0182013-06-16 09:48:48 +0900571static int f2fs_remount(struct super_block *sb, int *flags, char *data)
572{
573 struct f2fs_sb_info *sbi = F2FS_SB(sb);
574 struct f2fs_mount_info org_mount_opt;
575 int err, active_logs;
576
577 /*
578 * Save the old mount options in case we
579 * need to restore them.
580 */
581 org_mount_opt = sbi->mount_opt;
582 active_logs = sbi->active_logs;
583
584 /* parse mount options */
585 err = parse_options(sb, data);
586 if (err)
587 goto restore_opts;
588
589 /*
590 * Previous and new state of filesystem is RO,
591 * so no point in checking GC conditions.
592 */
593 if ((sb->s_flags & MS_RDONLY) && (*flags & MS_RDONLY))
594 goto skip;
595
596 /*
597 * We stop the GC thread if FS is mounted as RO
598 * or if background_gc = off is passed in mount
599 * option. Also sync the filesystem.
600 */
601 if ((*flags & MS_RDONLY) || !test_opt(sbi, BG_GC)) {
602 if (sbi->gc_thread) {
603 stop_gc_thread(sbi);
604 f2fs_sync_fs(sb, 1);
605 }
606 } else if (test_opt(sbi, BG_GC) && !sbi->gc_thread) {
607 err = start_gc_thread(sbi);
608 if (err)
609 goto restore_opts;
610 }
611skip:
612 /* Update the POSIXACL Flag */
613 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
614 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
615 return 0;
616
617restore_opts:
618 sbi->mount_opt = org_mount_opt;
619 sbi->active_logs = active_logs;
620 return err;
621}
622
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900623static struct super_operations f2fs_sops = {
624 .alloc_inode = f2fs_alloc_inode,
Jaegeuk Kim531ad7d2013-04-30 11:33:27 +0900625 .drop_inode = f2fs_drop_inode,
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900626 .destroy_inode = f2fs_destroy_inode,
627 .write_inode = f2fs_write_inode,
Jaegeuk Kimb3783872013-06-10 09:17:01 +0900628 .dirty_inode = f2fs_dirty_inode,
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900629 .show_options = f2fs_show_options,
630 .evict_inode = f2fs_evict_inode,
631 .put_super = f2fs_put_super,
632 .sync_fs = f2fs_sync_fs,
Changman Leed6212a52013-01-29 18:30:07 +0900633 .freeze_fs = f2fs_freeze,
634 .unfreeze_fs = f2fs_unfreeze,
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900635 .statfs = f2fs_statfs,
Namjae Jeon696c0182013-06-16 09:48:48 +0900636 .remount_fs = f2fs_remount,
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900637};
638
639static struct inode *f2fs_nfs_get_inode(struct super_block *sb,
640 u64 ino, u32 generation)
641{
642 struct f2fs_sb_info *sbi = F2FS_SB(sb);
643 struct inode *inode;
644
Jaegeuk Kim6bacf522013-12-06 15:00:58 +0900645 if (unlikely(ino < F2FS_ROOT_INO(sbi)))
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900646 return ERR_PTR(-ESTALE);
Chao Yu910bb122014-03-12 17:08:36 +0800647 if (unlikely(ino >= NM_I(sbi)->max_nid))
648 return ERR_PTR(-ESTALE);
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900649
650 /*
651 * f2fs_iget isn't quite right if the inode is currently unallocated!
652 * However f2fs_iget currently does appropriate checks to handle stale
653 * inodes so everything is OK.
654 */
655 inode = f2fs_iget(sb, ino);
656 if (IS_ERR(inode))
657 return ERR_CAST(inode);
Jaegeuk Kim6bacf522013-12-06 15:00:58 +0900658 if (unlikely(generation && inode->i_generation != generation)) {
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900659 /* we didn't find the right inode.. */
660 iput(inode);
661 return ERR_PTR(-ESTALE);
662 }
663 return inode;
664}
665
666static struct dentry *f2fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
667 int fh_len, int fh_type)
668{
669 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
670 f2fs_nfs_get_inode);
671}
672
673static struct dentry *f2fs_fh_to_parent(struct super_block *sb, struct fid *fid,
674 int fh_len, int fh_type)
675{
676 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
677 f2fs_nfs_get_inode);
678}
679
680static const struct export_operations f2fs_export_ops = {
681 .fh_to_dentry = f2fs_fh_to_dentry,
682 .fh_to_parent = f2fs_fh_to_parent,
683 .get_parent = f2fs_get_parent,
684};
685
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900686static loff_t max_file_size(unsigned bits)
687{
Jaegeuk Kimde936532013-08-12 21:08:03 +0900688 loff_t result = (DEF_ADDRS_PER_INODE - F2FS_INLINE_XATTR_ADDRS);
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900689 loff_t leaf_count = ADDRS_PER_BLOCK;
690
691 /* two direct node blocks */
692 result += (leaf_count * 2);
693
694 /* two indirect node blocks */
695 leaf_count *= NIDS_PER_BLOCK;
696 result += (leaf_count * 2);
697
698 /* one double indirect node block */
699 leaf_count *= NIDS_PER_BLOCK;
700 result += leaf_count;
701
702 result <<= bits;
703 return result;
704}
705
Namjae Jeona07ef782012-12-30 14:52:05 +0900706static int sanity_check_raw_super(struct super_block *sb,
707 struct f2fs_super_block *raw_super)
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900708{
709 unsigned int blocksize;
710
Namjae Jeona07ef782012-12-30 14:52:05 +0900711 if (F2FS_SUPER_MAGIC != le32_to_cpu(raw_super->magic)) {
712 f2fs_msg(sb, KERN_INFO,
713 "Magic Mismatch, valid(0x%x) - read(0x%x)",
714 F2FS_SUPER_MAGIC, le32_to_cpu(raw_super->magic));
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900715 return 1;
Namjae Jeona07ef782012-12-30 14:52:05 +0900716 }
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900717
majianpeng5c9b4692013-02-01 19:07:57 +0800718 /* Currently, support only 4KB page cache size */
719 if (F2FS_BLKSIZE != PAGE_CACHE_SIZE) {
720 f2fs_msg(sb, KERN_INFO,
majianpeng14d7e9d2013-02-01 19:07:03 +0800721 "Invalid page_cache_size (%lu), supports only 4KB\n",
majianpeng5c9b4692013-02-01 19:07:57 +0800722 PAGE_CACHE_SIZE);
723 return 1;
724 }
725
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900726 /* Currently, support only 4KB block size */
727 blocksize = 1 << le32_to_cpu(raw_super->log_blocksize);
majianpeng5c9b4692013-02-01 19:07:57 +0800728 if (blocksize != F2FS_BLKSIZE) {
Namjae Jeona07ef782012-12-30 14:52:05 +0900729 f2fs_msg(sb, KERN_INFO,
730 "Invalid blocksize (%u), supports only 4KB\n",
731 blocksize);
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900732 return 1;
Namjae Jeona07ef782012-12-30 14:52:05 +0900733 }
majianpeng5c9b4692013-02-01 19:07:57 +0800734
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900735 if (le32_to_cpu(raw_super->log_sectorsize) !=
Namjae Jeona07ef782012-12-30 14:52:05 +0900736 F2FS_LOG_SECTOR_SIZE) {
737 f2fs_msg(sb, KERN_INFO, "Invalid log sectorsize");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900738 return 1;
Namjae Jeona07ef782012-12-30 14:52:05 +0900739 }
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900740 if (le32_to_cpu(raw_super->log_sectors_per_block) !=
Namjae Jeona07ef782012-12-30 14:52:05 +0900741 F2FS_LOG_SECTORS_PER_BLOCK) {
742 f2fs_msg(sb, KERN_INFO, "Invalid log sectors per block");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900743 return 1;
Namjae Jeona07ef782012-12-30 14:52:05 +0900744 }
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900745 return 0;
746}
747
Jaegeuk Kim577e3492013-01-24 19:56:11 +0900748static int sanity_check_ckpt(struct f2fs_sb_info *sbi)
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900749{
750 unsigned int total, fsmeta;
Jaegeuk Kim577e3492013-01-24 19:56:11 +0900751 struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
752 struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900753
754 total = le32_to_cpu(raw_super->segment_count);
755 fsmeta = le32_to_cpu(raw_super->segment_count_ckpt);
756 fsmeta += le32_to_cpu(raw_super->segment_count_sit);
757 fsmeta += le32_to_cpu(raw_super->segment_count_nat);
758 fsmeta += le32_to_cpu(ckpt->rsvd_segment_count);
759 fsmeta += le32_to_cpu(raw_super->segment_count_ssa);
760
Jaegeuk Kim6bacf522013-12-06 15:00:58 +0900761 if (unlikely(fsmeta >= total))
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900762 return 1;
Jaegeuk Kim577e3492013-01-24 19:56:11 +0900763
Jaegeuk Kim6bacf522013-12-06 15:00:58 +0900764 if (unlikely(is_set_ckpt_flags(ckpt, CP_ERROR_FLAG))) {
Jaegeuk Kim577e3492013-01-24 19:56:11 +0900765 f2fs_msg(sbi->sb, KERN_ERR, "A bug case: need to run fsck");
766 return 1;
767 }
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900768 return 0;
769}
770
771static void init_sb_info(struct f2fs_sb_info *sbi)
772{
773 struct f2fs_super_block *raw_super = sbi->raw_super;
774 int i;
775
776 sbi->log_sectors_per_block =
777 le32_to_cpu(raw_super->log_sectors_per_block);
778 sbi->log_blocksize = le32_to_cpu(raw_super->log_blocksize);
779 sbi->blocksize = 1 << sbi->log_blocksize;
780 sbi->log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
781 sbi->blocks_per_seg = 1 << sbi->log_blocks_per_seg;
782 sbi->segs_per_sec = le32_to_cpu(raw_super->segs_per_sec);
783 sbi->secs_per_zone = le32_to_cpu(raw_super->secs_per_zone);
784 sbi->total_sections = le32_to_cpu(raw_super->section_count);
785 sbi->total_node_count =
786 (le32_to_cpu(raw_super->segment_count_nat) / 2)
787 * sbi->blocks_per_seg * NAT_ENTRY_PER_BLOCK;
788 sbi->root_ino_num = le32_to_cpu(raw_super->root_ino);
789 sbi->node_ino_num = le32_to_cpu(raw_super->node_ino);
790 sbi->meta_ino_num = le32_to_cpu(raw_super->meta_ino);
Jaegeuk Kim5ec4e492013-03-31 13:26:03 +0900791 sbi->cur_victim_sec = NULL_SECNO;
Jaegeuk Kimb1c57c12014-01-08 13:45:08 +0900792 sbi->max_victim_search = DEF_MAX_VICTIM_SEARCH;
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900793
794 for (i = 0; i < NR_COUNT_TYPE; i++)
795 atomic_set(&sbi->nr_pages[i], 0);
Jaegeuk Kimab9fa662014-02-27 20:09:05 +0900796
797 sbi->dir_level = DEF_DIR_LEVEL;
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900798}
799
Gu Zheng9076a752013-10-14 18:47:11 +0800800/*
801 * Read f2fs raw super block.
802 * Because we have two copies of super block, so read the first one at first,
803 * if the first one is invalid, move to read the second one.
804 */
805static int read_raw_super_block(struct super_block *sb,
806 struct f2fs_super_block **raw_super,
807 struct buffer_head **raw_super_buf)
majianpeng14d7e9d2013-02-01 19:07:03 +0800808{
Gu Zheng9076a752013-10-14 18:47:11 +0800809 int block = 0;
majianpeng14d7e9d2013-02-01 19:07:03 +0800810
Gu Zheng9076a752013-10-14 18:47:11 +0800811retry:
majianpeng14d7e9d2013-02-01 19:07:03 +0800812 *raw_super_buf = sb_bread(sb, block);
813 if (!*raw_super_buf) {
Gu Zheng9076a752013-10-14 18:47:11 +0800814 f2fs_msg(sb, KERN_ERR, "Unable to read %dth superblock",
815 block + 1);
816 if (block == 0) {
817 block++;
818 goto retry;
819 } else {
820 return -EIO;
821 }
majianpeng14d7e9d2013-02-01 19:07:03 +0800822 }
823
824 *raw_super = (struct f2fs_super_block *)
825 ((char *)(*raw_super_buf)->b_data + F2FS_SUPER_OFFSET);
826
827 /* sanity checking of raw super */
Gu Zheng9076a752013-10-14 18:47:11 +0800828 if (sanity_check_raw_super(sb, *raw_super)) {
829 brelse(*raw_super_buf);
Chris Fries6c311ec2014-01-17 14:44:39 -0600830 f2fs_msg(sb, KERN_ERR,
831 "Can't find valid F2FS filesystem in %dth superblock",
832 block + 1);
Jaegeuk Kim6bacf522013-12-06 15:00:58 +0900833 if (block == 0) {
Gu Zheng9076a752013-10-14 18:47:11 +0800834 block++;
835 goto retry;
836 } else {
837 return -EINVAL;
838 }
839 }
majianpeng14d7e9d2013-02-01 19:07:03 +0800840
Gu Zheng9076a752013-10-14 18:47:11 +0800841 return 0;
majianpeng14d7e9d2013-02-01 19:07:03 +0800842}
843
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900844static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
845{
846 struct f2fs_sb_info *sbi;
847 struct f2fs_super_block *raw_super;
848 struct buffer_head *raw_super_buf;
849 struct inode *root;
850 long err = -EINVAL;
Jaegeuk Kim971767c2013-11-18 17:16:17 +0900851 int i;
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900852
853 /* allocate memory for f2fs-specific super block info */
854 sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL);
855 if (!sbi)
856 return -ENOMEM;
857
Namjae Jeonff9234a2013-01-12 14:41:13 +0900858 /* set a block size */
Jaegeuk Kim6bacf522013-12-06 15:00:58 +0900859 if (unlikely(!sb_set_blocksize(sb, F2FS_BLKSIZE))) {
Namjae Jeona07ef782012-12-30 14:52:05 +0900860 f2fs_msg(sb, KERN_ERR, "unable to set blocksize");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900861 goto free_sbi;
Namjae Jeona07ef782012-12-30 14:52:05 +0900862 }
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900863
Gu Zheng9076a752013-10-14 18:47:11 +0800864 err = read_raw_super_block(sb, &raw_super, &raw_super_buf);
865 if (err)
866 goto free_sbi;
867
Gu Zheng5fb08372013-06-07 14:16:53 +0800868 sb->s_fs_info = sbi;
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900869 /* init some FS parameters */
870 sbi->active_logs = NR_CURSEG_TYPE;
871
872 set_opt(sbi, BG_GC);
873
874#ifdef CONFIG_F2FS_FS_XATTR
875 set_opt(sbi, XATTR_USER);
876#endif
877#ifdef CONFIG_F2FS_FS_POSIX_ACL
878 set_opt(sbi, POSIX_ACL);
879#endif
880 /* parse mount options */
Gu Zheng5fb08372013-06-07 14:16:53 +0800881 err = parse_options(sb, (char *)data);
Wei Yongjun66348b72013-04-12 10:23:18 +0800882 if (err)
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900883 goto free_sb_buf;
884
Jaegeuk Kim25ca9232012-11-28 16:12:41 +0900885 sb->s_maxbytes = max_file_size(le32_to_cpu(raw_super->log_blocksize));
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900886 sb->s_max_links = F2FS_LINK_MAX;
887 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
888
889 sb->s_op = &f2fs_sops;
890 sb->s_xattr = f2fs_xattr_handlers;
891 sb->s_export_op = &f2fs_export_ops;
892 sb->s_magic = F2FS_SUPER_MAGIC;
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900893 sb->s_time_gran = 1;
894 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
895 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
896 memcpy(sb->s_uuid, raw_super->uuid, sizeof(raw_super->uuid));
897
898 /* init f2fs-specific super block info */
899 sbi->sb = sb;
900 sbi->raw_super = raw_super;
901 sbi->raw_super_buf = raw_super_buf;
902 mutex_init(&sbi->gc_mutex);
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900903 mutex_init(&sbi->writepages);
904 mutex_init(&sbi->cp_mutex);
Jaegeuk Kim39936832012-11-22 16:21:29 +0900905 mutex_init(&sbi->node_write);
Haicheng Liaabe5132013-10-23 12:39:32 +0800906 sbi->por_doing = false;
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900907 spin_lock_init(&sbi->stat_lock);
Jaegeuk Kim971767c2013-11-18 17:16:17 +0900908
Chao Yu924b7202013-11-20 14:46:39 +0800909 mutex_init(&sbi->read_io.io_mutex);
Jaegeuk Kim458e6192013-12-11 13:54:01 +0900910 sbi->read_io.sbi = sbi;
911 sbi->read_io.bio = NULL;
912 for (i = 0; i < NR_PAGE_TYPE; i++) {
Jaegeuk Kim1ff7bd32013-11-19 12:47:22 +0900913 mutex_init(&sbi->write_io[i].io_mutex);
Jaegeuk Kim458e6192013-12-11 13:54:01 +0900914 sbi->write_io[i].sbi = sbi;
915 sbi->write_io[i].bio = NULL;
916 }
Jaegeuk Kim971767c2013-11-18 17:16:17 +0900917
Gu Zhenge4795562013-09-27 18:08:30 +0800918 init_rwsem(&sbi->cp_rwsem);
Changman Leefb51b5e2013-11-07 12:48:25 +0900919 init_waitqueue_head(&sbi->cp_wait);
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900920 init_sb_info(sbi);
921
922 /* get an inode for meta space */
923 sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi));
924 if (IS_ERR(sbi->meta_inode)) {
Namjae Jeona07ef782012-12-30 14:52:05 +0900925 f2fs_msg(sb, KERN_ERR, "Failed to read F2FS meta data inode");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900926 err = PTR_ERR(sbi->meta_inode);
927 goto free_sb_buf;
928 }
929
930 err = get_valid_checkpoint(sbi);
Namjae Jeona07ef782012-12-30 14:52:05 +0900931 if (err) {
932 f2fs_msg(sb, KERN_ERR, "Failed to get valid F2FS checkpoint");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900933 goto free_meta_inode;
Namjae Jeona07ef782012-12-30 14:52:05 +0900934 }
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900935
936 /* sanity checking of checkpoint */
937 err = -EINVAL;
Jaegeuk Kim577e3492013-01-24 19:56:11 +0900938 if (sanity_check_ckpt(sbi)) {
Namjae Jeona07ef782012-12-30 14:52:05 +0900939 f2fs_msg(sb, KERN_ERR, "Invalid F2FS checkpoint");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900940 goto free_cp;
Namjae Jeona07ef782012-12-30 14:52:05 +0900941 }
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900942
943 sbi->total_valid_node_count =
944 le32_to_cpu(sbi->ckpt->valid_node_count);
945 sbi->total_valid_inode_count =
946 le32_to_cpu(sbi->ckpt->valid_inode_count);
947 sbi->user_block_count = le64_to_cpu(sbi->ckpt->user_block_count);
948 sbi->total_valid_block_count =
949 le64_to_cpu(sbi->ckpt->valid_block_count);
950 sbi->last_valid_block_count = sbi->total_valid_block_count;
951 sbi->alloc_valid_block_count = 0;
952 INIT_LIST_HEAD(&sbi->dir_inode_list);
953 spin_lock_init(&sbi->dir_inode_lock);
954
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900955 init_orphan_info(sbi);
956
957 /* setup f2fs internal modules */
958 err = build_segment_manager(sbi);
Namjae Jeona07ef782012-12-30 14:52:05 +0900959 if (err) {
960 f2fs_msg(sb, KERN_ERR,
961 "Failed to initialize F2FS segment manager");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900962 goto free_sm;
Namjae Jeona07ef782012-12-30 14:52:05 +0900963 }
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900964 err = build_node_manager(sbi);
Namjae Jeona07ef782012-12-30 14:52:05 +0900965 if (err) {
966 f2fs_msg(sb, KERN_ERR,
967 "Failed to initialize F2FS node manager");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900968 goto free_nm;
Namjae Jeona07ef782012-12-30 14:52:05 +0900969 }
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900970
971 build_gc_manager(sbi);
972
973 /* get an inode for node space */
974 sbi->node_inode = f2fs_iget(sb, F2FS_NODE_INO(sbi));
975 if (IS_ERR(sbi->node_inode)) {
Namjae Jeona07ef782012-12-30 14:52:05 +0900976 f2fs_msg(sb, KERN_ERR, "Failed to read node inode");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900977 err = PTR_ERR(sbi->node_inode);
978 goto free_nm;
979 }
980
981 /* if there are nt orphan nodes free them */
Chao Yu8f99a942013-11-28 15:43:43 +0800982 recover_orphan_inodes(sbi);
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900983
984 /* read root inode and dentry */
985 root = f2fs_iget(sb, F2FS_ROOT_INO(sbi));
986 if (IS_ERR(root)) {
Namjae Jeona07ef782012-12-30 14:52:05 +0900987 f2fs_msg(sb, KERN_ERR, "Failed to read root inode");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900988 err = PTR_ERR(root);
989 goto free_node_inode;
990 }
Chao Yu8f99a942013-11-28 15:43:43 +0800991 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
992 err = -EINVAL;
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900993 goto free_root_inode;
Chao Yu8f99a942013-11-28 15:43:43 +0800994 }
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900995
996 sb->s_root = d_make_root(root); /* allocate root dentry */
997 if (!sb->s_root) {
998 err = -ENOMEM;
999 goto free_root_inode;
1000 }
1001
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09001002 err = f2fs_build_stats(sbi);
1003 if (err)
Jaegeuk Kim6437d1b2014-02-19 18:23:32 +09001004 goto free_root_inode;
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09001005
Jaegeuk Kim5e176d52013-06-28 12:47:01 +09001006 if (f2fs_proc_root)
1007 sbi->s_proc = proc_mkdir(sb->s_id, f2fs_proc_root);
1008
1009 if (sbi->s_proc)
1010 proc_create_data("segment_info", S_IRUGO, sbi->s_proc,
1011 &f2fs_seq_segment_info_fops, sb);
1012
Namjae Jeond3ee4562013-03-17 17:26:14 +09001013 if (test_opt(sbi, DISCARD)) {
1014 struct request_queue *q = bdev_get_queue(sb->s_bdev);
1015 if (!blk_queue_discard(q))
1016 f2fs_msg(sb, KERN_WARNING,
1017 "mounting with \"discard\" option, but "
1018 "the device does not support discard");
1019 }
1020
Namjae Jeonb59d0ba2013-08-04 23:09:40 +09001021 sbi->s_kobj.kset = f2fs_kset;
1022 init_completion(&sbi->s_kobj_unregister);
1023 err = kobject_init_and_add(&sbi->s_kobj, &f2fs_ktype, NULL,
1024 "%s", sb->s_id);
1025 if (err)
Jaegeuk Kim6437d1b2014-02-19 18:23:32 +09001026 goto free_proc;
Namjae Jeonb59d0ba2013-08-04 23:09:40 +09001027
Jaegeuk Kim6437d1b2014-02-19 18:23:32 +09001028 /* recover fsynced data */
1029 if (!test_opt(sbi, DISABLE_ROLL_FORWARD)) {
1030 err = recover_fsync_data(sbi);
1031 if (err)
1032 f2fs_msg(sb, KERN_ERR,
1033 "Cannot recover all fsync data errno=%ld", err);
1034 }
1035
1036 /*
1037 * If filesystem is not mounted as read-only then
1038 * do start the gc_thread.
1039 */
1040 if (!(sb->s_flags & MS_RDONLY)) {
1041 /* After POR, we can run background GC thread.*/
1042 err = start_gc_thread(sbi);
1043 if (err)
1044 goto free_kobj;
1045 }
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09001046 return 0;
Jaegeuk Kim6437d1b2014-02-19 18:23:32 +09001047
1048free_kobj:
1049 kobject_del(&sbi->s_kobj);
1050free_proc:
Chao Yu1d15bd22013-11-07 10:14:51 +08001051 if (sbi->s_proc) {
1052 remove_proc_entry("segment_info", sbi->s_proc);
1053 remove_proc_entry(sb->s_id, f2fs_proc_root);
1054 }
1055 f2fs_destroy_stats(sbi);
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09001056free_root_inode:
1057 dput(sb->s_root);
1058 sb->s_root = NULL;
1059free_node_inode:
1060 iput(sbi->node_inode);
1061free_nm:
1062 destroy_node_manager(sbi);
1063free_sm:
1064 destroy_segment_manager(sbi);
1065free_cp:
1066 kfree(sbi->ckpt);
1067free_meta_inode:
1068 make_bad_inode(sbi->meta_inode);
1069 iput(sbi->meta_inode);
1070free_sb_buf:
1071 brelse(raw_super_buf);
1072free_sbi:
1073 kfree(sbi);
1074 return err;
1075}
1076
1077static struct dentry *f2fs_mount(struct file_system_type *fs_type, int flags,
1078 const char *dev_name, void *data)
1079{
1080 return mount_bdev(fs_type, flags, dev_name, data, f2fs_fill_super);
1081}
1082
1083static struct file_system_type f2fs_fs_type = {
1084 .owner = THIS_MODULE,
1085 .name = "f2fs",
1086 .mount = f2fs_mount,
1087 .kill_sb = kill_block_super,
1088 .fs_flags = FS_REQUIRES_DEV,
1089};
Eric W. Biederman7f78e032013-03-02 19:39:14 -08001090MODULE_ALIAS_FS("f2fs");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09001091
Namjae Jeon6e6093a2013-01-17 00:08:30 +09001092static int __init init_inodecache(void)
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09001093{
1094 f2fs_inode_cachep = f2fs_kmem_cache_create("f2fs_inode_cache",
Gu Zhenge8512d22014-03-07 18:43:28 +08001095 sizeof(struct f2fs_inode_info));
Jaegeuk Kim6bacf522013-12-06 15:00:58 +09001096 if (!f2fs_inode_cachep)
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09001097 return -ENOMEM;
1098 return 0;
1099}
1100
1101static void destroy_inodecache(void)
1102{
1103 /*
1104 * Make sure all delayed rcu free inodes are flushed before we
1105 * destroy cache.
1106 */
1107 rcu_barrier();
1108 kmem_cache_destroy(f2fs_inode_cachep);
1109}
1110
1111static int __init init_f2fs_fs(void)
1112{
1113 int err;
1114
1115 err = init_inodecache();
1116 if (err)
1117 goto fail;
1118 err = create_node_manager_caches();
1119 if (err)
Zhao Hongjiang9890ff32013-08-20 16:49:51 +08001120 goto free_inodecache;
Jaegeuk Kim7fd9e542013-11-15 13:55:58 +09001121 err = create_segment_manager_caches();
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09001122 if (err)
Zhao Hongjiang9890ff32013-08-20 16:49:51 +08001123 goto free_node_manager_caches;
Jaegeuk Kim7fd9e542013-11-15 13:55:58 +09001124 err = create_gc_caches();
1125 if (err)
1126 goto free_segment_manager_caches;
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09001127 err = create_checkpoint_caches();
1128 if (err)
Zhao Hongjiang9890ff32013-08-20 16:49:51 +08001129 goto free_gc_caches;
Namjae Jeonb59d0ba2013-08-04 23:09:40 +09001130 f2fs_kset = kset_create_and_add("f2fs", NULL, fs_kobj);
Wei Yongjun6e6b9782013-08-23 08:30:20 +08001131 if (!f2fs_kset) {
1132 err = -ENOMEM;
Zhao Hongjiang9890ff32013-08-20 16:49:51 +08001133 goto free_checkpoint_caches;
Wei Yongjun6e6b9782013-08-23 08:30:20 +08001134 }
Namjae Jeon4589d252013-01-15 19:58:47 +09001135 err = register_filesystem(&f2fs_fs_type);
1136 if (err)
Zhao Hongjiang9890ff32013-08-20 16:49:51 +08001137 goto free_kset;
Namjae Jeon4589d252013-01-15 19:58:47 +09001138 f2fs_create_root_stats();
Jaegeuk Kim5e176d52013-06-28 12:47:01 +09001139 f2fs_proc_root = proc_mkdir("fs/f2fs", NULL);
Zhao Hongjiang9890ff32013-08-20 16:49:51 +08001140 return 0;
1141
1142free_kset:
1143 kset_unregister(f2fs_kset);
1144free_checkpoint_caches:
1145 destroy_checkpoint_caches();
1146free_gc_caches:
1147 destroy_gc_caches();
Jaegeuk Kim7fd9e542013-11-15 13:55:58 +09001148free_segment_manager_caches:
1149 destroy_segment_manager_caches();
Zhao Hongjiang9890ff32013-08-20 16:49:51 +08001150free_node_manager_caches:
1151 destroy_node_manager_caches();
1152free_inodecache:
1153 destroy_inodecache();
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09001154fail:
1155 return err;
1156}
1157
1158static void __exit exit_f2fs_fs(void)
1159{
Jaegeuk Kim5e176d52013-06-28 12:47:01 +09001160 remove_proc_entry("fs/f2fs", NULL);
Namjae Jeon4589d252013-01-15 19:58:47 +09001161 f2fs_destroy_root_stats();
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09001162 unregister_filesystem(&f2fs_fs_type);
1163 destroy_checkpoint_caches();
1164 destroy_gc_caches();
Changman Lee5dcd8a72013-12-11 14:32:13 +09001165 destroy_segment_manager_caches();
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09001166 destroy_node_manager_caches();
1167 destroy_inodecache();
Namjae Jeonb59d0ba2013-08-04 23:09:40 +09001168 kset_unregister(f2fs_kset);
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09001169}
1170
1171module_init(init_f2fs_fs)
1172module_exit(exit_f2fs_fs)
1173
1174MODULE_AUTHOR("Samsung Electronics's Praesto Team");
1175MODULE_DESCRIPTION("Flash Friendly File System");
1176MODULE_LICENSE("GPL");