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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 Kim6b4afdd2014-04-02 15:34:36 +090054 Opt_flush_merge,
Jaegeuk Kimaff063e2012-11-02 17:07:47 +090055 Opt_err,
56};
57
58static match_table_t f2fs_tokens = {
Namjae Jeon696c0182013-06-16 09:48:48 +090059 {Opt_gc_background, "background_gc=%s"},
Jaegeuk Kimaff063e2012-11-02 17:07:47 +090060 {Opt_disable_roll_forward, "disable_roll_forward"},
61 {Opt_discard, "discard"},
62 {Opt_noheap, "no_heap"},
Kelly Anderson4058c512013-10-07 11:36:20 +090063 {Opt_user_xattr, "user_xattr"},
Jaegeuk Kimaff063e2012-11-02 17:07:47 +090064 {Opt_nouser_xattr, "nouser_xattr"},
Kelly Anderson4058c512013-10-07 11:36:20 +090065 {Opt_acl, "acl"},
Jaegeuk Kimaff063e2012-11-02 17:07:47 +090066 {Opt_noacl, "noacl"},
67 {Opt_active_logs, "active_logs=%u"},
68 {Opt_disable_ext_identify, "disable_ext_identify"},
Jaegeuk Kim444c5802013-08-08 15:16:22 +090069 {Opt_inline_xattr, "inline_xattr"},
Huajun Li8274de72013-11-10 23:13:17 +080070 {Opt_inline_data, "inline_data"},
Jaegeuk Kim6b4afdd2014-04-02 15:34:36 +090071 {Opt_flush_merge, "flush_merge"},
Jaegeuk Kimaff063e2012-11-02 17:07:47 +090072 {Opt_err, NULL},
73};
74
Namjae Jeonb59d0ba2013-08-04 23:09:40 +090075/* Sysfs support for f2fs */
Jaegeuk Kimea91e9b2013-10-24 15:49:07 +090076enum {
77 GC_THREAD, /* struct f2fs_gc_thread */
78 SM_INFO, /* struct f2fs_sm_info */
Jaegeuk Kimcdfc41c2014-03-19 13:31:37 +090079 NM_INFO, /* struct f2fs_nm_info */
Jaegeuk Kimb1c57c12014-01-08 13:45:08 +090080 F2FS_SBI, /* struct f2fs_sb_info */
Jaegeuk Kimea91e9b2013-10-24 15:49:07 +090081};
82
Namjae Jeonb59d0ba2013-08-04 23:09:40 +090083struct f2fs_attr {
84 struct attribute attr;
85 ssize_t (*show)(struct f2fs_attr *, struct f2fs_sb_info *, char *);
86 ssize_t (*store)(struct f2fs_attr *, struct f2fs_sb_info *,
87 const char *, size_t);
Jaegeuk Kimea91e9b2013-10-24 15:49:07 +090088 int struct_type;
Namjae Jeonb59d0ba2013-08-04 23:09:40 +090089 int offset;
90};
91
Jaegeuk Kimea91e9b2013-10-24 15:49:07 +090092static unsigned char *__struct_ptr(struct f2fs_sb_info *sbi, int struct_type)
93{
94 if (struct_type == GC_THREAD)
95 return (unsigned char *)sbi->gc_thread;
96 else if (struct_type == SM_INFO)
97 return (unsigned char *)SM_I(sbi);
Jaegeuk Kimcdfc41c2014-03-19 13:31:37 +090098 else if (struct_type == NM_INFO)
99 return (unsigned char *)NM_I(sbi);
Jaegeuk Kimb1c57c12014-01-08 13:45:08 +0900100 else if (struct_type == F2FS_SBI)
101 return (unsigned char *)sbi;
Jaegeuk Kimea91e9b2013-10-24 15:49:07 +0900102 return NULL;
103}
104
Namjae Jeonb59d0ba2013-08-04 23:09:40 +0900105static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
106 struct f2fs_sb_info *sbi, char *buf)
107{
Jaegeuk Kimea91e9b2013-10-24 15:49:07 +0900108 unsigned char *ptr = NULL;
Namjae Jeonb59d0ba2013-08-04 23:09:40 +0900109 unsigned int *ui;
110
Jaegeuk Kimea91e9b2013-10-24 15:49:07 +0900111 ptr = __struct_ptr(sbi, a->struct_type);
112 if (!ptr)
Namjae Jeonb59d0ba2013-08-04 23:09:40 +0900113 return -EINVAL;
114
Jaegeuk Kimea91e9b2013-10-24 15:49:07 +0900115 ui = (unsigned int *)(ptr + a->offset);
Namjae Jeonb59d0ba2013-08-04 23:09:40 +0900116
117 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
118}
119
120static ssize_t f2fs_sbi_store(struct f2fs_attr *a,
121 struct f2fs_sb_info *sbi,
122 const char *buf, size_t count)
123{
Jaegeuk Kimea91e9b2013-10-24 15:49:07 +0900124 unsigned char *ptr;
Namjae Jeonb59d0ba2013-08-04 23:09:40 +0900125 unsigned long t;
126 unsigned int *ui;
127 ssize_t ret;
128
Jaegeuk Kimea91e9b2013-10-24 15:49:07 +0900129 ptr = __struct_ptr(sbi, a->struct_type);
130 if (!ptr)
Namjae Jeonb59d0ba2013-08-04 23:09:40 +0900131 return -EINVAL;
132
Jaegeuk Kimea91e9b2013-10-24 15:49:07 +0900133 ui = (unsigned int *)(ptr + a->offset);
Namjae Jeonb59d0ba2013-08-04 23:09:40 +0900134
135 ret = kstrtoul(skip_spaces(buf), 0, &t);
136 if (ret < 0)
137 return ret;
138 *ui = t;
139 return count;
140}
141
142static ssize_t f2fs_attr_show(struct kobject *kobj,
143 struct attribute *attr, char *buf)
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->show ? a->show(a, sbi, buf) : 0;
150}
151
152static ssize_t f2fs_attr_store(struct kobject *kobj, struct attribute *attr,
153 const char *buf, size_t len)
154{
155 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
156 s_kobj);
157 struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
158
159 return a->store ? a->store(a, sbi, buf, len) : 0;
160}
161
162static void f2fs_sb_release(struct kobject *kobj)
163{
164 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
165 s_kobj);
166 complete(&sbi->s_kobj_unregister);
167}
168
Jaegeuk Kimea91e9b2013-10-24 15:49:07 +0900169#define F2FS_ATTR_OFFSET(_struct_type, _name, _mode, _show, _store, _offset) \
Namjae Jeonb59d0ba2013-08-04 23:09:40 +0900170static struct f2fs_attr f2fs_attr_##_name = { \
171 .attr = {.name = __stringify(_name), .mode = _mode }, \
172 .show = _show, \
173 .store = _store, \
Jaegeuk Kimea91e9b2013-10-24 15:49:07 +0900174 .struct_type = _struct_type, \
175 .offset = _offset \
Namjae Jeonb59d0ba2013-08-04 23:09:40 +0900176}
177
Jaegeuk Kimea91e9b2013-10-24 15:49:07 +0900178#define F2FS_RW_ATTR(struct_type, struct_name, name, elname) \
179 F2FS_ATTR_OFFSET(struct_type, name, 0644, \
180 f2fs_sbi_show, f2fs_sbi_store, \
181 offsetof(struct struct_name, elname))
Namjae Jeonb59d0ba2013-08-04 23:09:40 +0900182
Jaegeuk Kimea91e9b2013-10-24 15:49:07 +0900183F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_min_sleep_time, min_sleep_time);
184F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_max_sleep_time, max_sleep_time);
185F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_no_gc_sleep_time, no_gc_sleep_time);
186F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_idle, gc_idle);
187F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, reclaim_segments, rec_prefree_segments);
Jaegeuk Kim7ac8c3b2013-11-12 15:00:38 +0900188F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, max_small_discards, max_discards);
Jaegeuk Kim216fbd62013-11-07 13:13:42 +0900189F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, ipu_policy, ipu_policy);
190F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ipu_util, min_ipu_util);
Jaegeuk Kimcdfc41c2014-03-19 13:31:37 +0900191F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ram_thresh, ram_thresh);
Jaegeuk Kimb1c57c12014-01-08 13:45:08 +0900192F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, max_victim_search, max_victim_search);
Jaegeuk Kimab9fa662014-02-27 20:09:05 +0900193F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, dir_level, dir_level);
Namjae Jeonb59d0ba2013-08-04 23:09:40 +0900194
195#define ATTR_LIST(name) (&f2fs_attr_##name.attr)
196static struct attribute *f2fs_attrs[] = {
197 ATTR_LIST(gc_min_sleep_time),
198 ATTR_LIST(gc_max_sleep_time),
199 ATTR_LIST(gc_no_gc_sleep_time),
Namjae Jeond2dc0952013-08-04 23:10:15 +0900200 ATTR_LIST(gc_idle),
Jaegeuk Kimea91e9b2013-10-24 15:49:07 +0900201 ATTR_LIST(reclaim_segments),
Jaegeuk Kim7ac8c3b2013-11-12 15:00:38 +0900202 ATTR_LIST(max_small_discards),
Jaegeuk Kim216fbd62013-11-07 13:13:42 +0900203 ATTR_LIST(ipu_policy),
204 ATTR_LIST(min_ipu_util),
Jaegeuk Kimb1c57c12014-01-08 13:45:08 +0900205 ATTR_LIST(max_victim_search),
Jaegeuk Kimab9fa662014-02-27 20:09:05 +0900206 ATTR_LIST(dir_level),
Jaegeuk Kimcdfc41c2014-03-19 13:31:37 +0900207 ATTR_LIST(ram_thresh),
Namjae Jeonb59d0ba2013-08-04 23:09:40 +0900208 NULL,
209};
210
211static const struct sysfs_ops f2fs_attr_ops = {
212 .show = f2fs_attr_show,
213 .store = f2fs_attr_store,
214};
215
216static struct kobj_type f2fs_ktype = {
217 .default_attrs = f2fs_attrs,
218 .sysfs_ops = &f2fs_attr_ops,
219 .release = f2fs_sb_release,
220};
221
Namjae Jeona07ef782012-12-30 14:52:05 +0900222void f2fs_msg(struct super_block *sb, const char *level, const char *fmt, ...)
223{
224 struct va_format vaf;
225 va_list args;
226
227 va_start(args, fmt);
228 vaf.fmt = fmt;
229 vaf.va = &args;
230 printk("%sF2FS-fs (%s): %pV\n", level, sb->s_id, &vaf);
231 va_end(args);
232}
233
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900234static void init_once(void *foo)
235{
236 struct f2fs_inode_info *fi = (struct f2fs_inode_info *) foo;
237
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900238 inode_init_once(&fi->vfs_inode);
239}
240
Namjae Jeon696c0182013-06-16 09:48:48 +0900241static int parse_options(struct super_block *sb, char *options)
242{
243 struct f2fs_sb_info *sbi = F2FS_SB(sb);
244 substring_t args[MAX_OPT_ARGS];
245 char *p, *name;
246 int arg = 0;
247
248 if (!options)
249 return 0;
250
251 while ((p = strsep(&options, ",")) != NULL) {
252 int token;
253 if (!*p)
254 continue;
255 /*
256 * Initialize args struct so we know whether arg was
257 * found; some options take optional arguments.
258 */
259 args[0].to = args[0].from = NULL;
260 token = match_token(p, f2fs_tokens, args);
261
262 switch (token) {
263 case Opt_gc_background:
264 name = match_strdup(&args[0]);
265
266 if (!name)
267 return -ENOMEM;
Chao Yu04c09382014-03-18 09:07:59 +0800268 if (strlen(name) == 2 && !strncmp(name, "on", 2))
Namjae Jeon696c0182013-06-16 09:48:48 +0900269 set_opt(sbi, BG_GC);
Chao Yu04c09382014-03-18 09:07:59 +0800270 else if (strlen(name) == 3 && !strncmp(name, "off", 3))
Namjae Jeon696c0182013-06-16 09:48:48 +0900271 clear_opt(sbi, BG_GC);
272 else {
273 kfree(name);
274 return -EINVAL;
275 }
276 kfree(name);
277 break;
278 case Opt_disable_roll_forward:
279 set_opt(sbi, DISABLE_ROLL_FORWARD);
280 break;
281 case Opt_discard:
282 set_opt(sbi, DISCARD);
283 break;
284 case Opt_noheap:
285 set_opt(sbi, NOHEAP);
286 break;
287#ifdef CONFIG_F2FS_FS_XATTR
Kelly Anderson4058c512013-10-07 11:36:20 +0900288 case Opt_user_xattr:
289 set_opt(sbi, XATTR_USER);
290 break;
Namjae Jeon696c0182013-06-16 09:48:48 +0900291 case Opt_nouser_xattr:
292 clear_opt(sbi, XATTR_USER);
293 break;
Jaegeuk Kim444c5802013-08-08 15:16:22 +0900294 case Opt_inline_xattr:
295 set_opt(sbi, INLINE_XATTR);
296 break;
Namjae Jeon696c0182013-06-16 09:48:48 +0900297#else
Kelly Anderson4058c512013-10-07 11:36:20 +0900298 case Opt_user_xattr:
299 f2fs_msg(sb, KERN_INFO,
300 "user_xattr options not supported");
301 break;
Namjae Jeon696c0182013-06-16 09:48:48 +0900302 case Opt_nouser_xattr:
303 f2fs_msg(sb, KERN_INFO,
304 "nouser_xattr options not supported");
305 break;
Jaegeuk Kim444c5802013-08-08 15:16:22 +0900306 case Opt_inline_xattr:
307 f2fs_msg(sb, KERN_INFO,
308 "inline_xattr options not supported");
309 break;
Namjae Jeon696c0182013-06-16 09:48:48 +0900310#endif
311#ifdef CONFIG_F2FS_FS_POSIX_ACL
Kelly Anderson4058c512013-10-07 11:36:20 +0900312 case Opt_acl:
313 set_opt(sbi, POSIX_ACL);
314 break;
Namjae Jeon696c0182013-06-16 09:48:48 +0900315 case Opt_noacl:
316 clear_opt(sbi, POSIX_ACL);
317 break;
318#else
Kelly Anderson4058c512013-10-07 11:36:20 +0900319 case Opt_acl:
320 f2fs_msg(sb, KERN_INFO, "acl options not supported");
321 break;
Namjae Jeon696c0182013-06-16 09:48:48 +0900322 case Opt_noacl:
323 f2fs_msg(sb, KERN_INFO, "noacl options not supported");
324 break;
325#endif
326 case Opt_active_logs:
327 if (args->from && match_int(args, &arg))
328 return -EINVAL;
329 if (arg != 2 && arg != 4 && arg != NR_CURSEG_TYPE)
330 return -EINVAL;
331 sbi->active_logs = arg;
332 break;
333 case Opt_disable_ext_identify:
334 set_opt(sbi, DISABLE_EXT_IDENTIFY);
335 break;
Huajun Li8274de72013-11-10 23:13:17 +0800336 case Opt_inline_data:
337 set_opt(sbi, INLINE_DATA);
338 break;
Jaegeuk Kim6b4afdd2014-04-02 15:34:36 +0900339 case Opt_flush_merge:
340 set_opt(sbi, FLUSH_MERGE);
341 break;
Namjae Jeon696c0182013-06-16 09:48:48 +0900342 default:
343 f2fs_msg(sb, KERN_ERR,
344 "Unrecognized mount option \"%s\" or missing value",
345 p);
346 return -EINVAL;
347 }
348 }
349 return 0;
350}
351
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900352static struct inode *f2fs_alloc_inode(struct super_block *sb)
353{
354 struct f2fs_inode_info *fi;
355
Chao Yua0acdfe2013-12-05 09:54:00 +0800356 fi = kmem_cache_alloc(f2fs_inode_cachep, GFP_F2FS_ZERO);
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900357 if (!fi)
358 return NULL;
359
360 init_once((void *) fi);
361
Masanari Iida434720f2013-03-19 08:03:35 +0900362 /* Initialize f2fs-specific inode info */
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900363 fi->vfs_inode.i_version = 1;
364 atomic_set(&fi->dirty_dents, 0);
365 fi->i_current_depth = 1;
366 fi->i_advise = 0;
367 rwlock_init(&fi->ext.ext_lock);
Jaegeuk Kimd928bfb2014-03-20 19:10:08 +0900368 init_rwsem(&fi->i_sem);
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900369
370 set_inode_flag(fi, FI_NEW_INODE);
371
Jaegeuk Kim444c5802013-08-08 15:16:22 +0900372 if (test_opt(F2FS_SB(sb), INLINE_XATTR))
373 set_inode_flag(fi, FI_INLINE_XATTR);
374
Jaegeuk Kimab9fa662014-02-27 20:09:05 +0900375 /* Will be used by directory only */
376 fi->i_dir_level = F2FS_SB(sb)->dir_level;
377
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900378 return &fi->vfs_inode;
379}
380
Jaegeuk Kim531ad7d2013-04-30 11:33:27 +0900381static int f2fs_drop_inode(struct inode *inode)
382{
383 /*
384 * This is to avoid a deadlock condition like below.
385 * writeback_single_inode(inode)
386 * - f2fs_write_data_page
387 * - f2fs_gc -> iput -> evict
388 * - inode_wait_for_writeback(inode)
389 */
390 if (!inode_unhashed(inode) && inode->i_state & I_SYNC)
391 return 0;
392 return generic_drop_inode(inode);
393}
394
Jaegeuk Kimb3783872013-06-10 09:17:01 +0900395/*
396 * f2fs_dirty_inode() is called from __mark_inode_dirty()
397 *
398 * We should call set_dirty_inode to write the dirty inode through write_inode.
399 */
400static void f2fs_dirty_inode(struct inode *inode, int flags)
401{
402 set_inode_flag(F2FS_I(inode), FI_DIRTY_INODE);
Jaegeuk Kimb3783872013-06-10 09:17:01 +0900403}
404
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900405static void f2fs_i_callback(struct rcu_head *head)
406{
407 struct inode *inode = container_of(head, struct inode, i_rcu);
408 kmem_cache_free(f2fs_inode_cachep, F2FS_I(inode));
409}
410
Jaegeuk Kim25ca9232012-11-28 16:12:41 +0900411static void f2fs_destroy_inode(struct inode *inode)
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900412{
413 call_rcu(&inode->i_rcu, f2fs_i_callback);
414}
415
416static void f2fs_put_super(struct super_block *sb)
417{
418 struct f2fs_sb_info *sbi = F2FS_SB(sb);
419
Jaegeuk Kim5e176d52013-06-28 12:47:01 +0900420 if (sbi->s_proc) {
421 remove_proc_entry("segment_info", sbi->s_proc);
422 remove_proc_entry(sb->s_id, f2fs_proc_root);
423 }
Namjae Jeonb59d0ba2013-08-04 23:09:40 +0900424 kobject_del(&sbi->s_kobj);
Jaegeuk Kim5e176d52013-06-28 12:47:01 +0900425
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900426 f2fs_destroy_stats(sbi);
427 stop_gc_thread(sbi);
428
Jaegeuk Kim5887d292013-10-08 09:30:33 +0900429 /* We don't need to do checkpoint when it's clean */
430 if (sbi->s_dirty && get_pages(sbi, F2FS_DIRTY_NODES))
431 write_checkpoint(sbi, true);
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900432
433 iput(sbi->node_inode);
434 iput(sbi->meta_inode);
435
436 /* destroy f2fs internal modules */
437 destroy_node_manager(sbi);
438 destroy_segment_manager(sbi);
439
440 kfree(sbi->ckpt);
Namjae Jeonb59d0ba2013-08-04 23:09:40 +0900441 kobject_put(&sbi->s_kobj);
442 wait_for_completion(&sbi->s_kobj_unregister);
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900443
444 sb->s_fs_info = NULL;
445 brelse(sbi->raw_super_buf);
446 kfree(sbi);
447}
448
449int f2fs_sync_fs(struct super_block *sb, int sync)
450{
451 struct f2fs_sb_info *sbi = F2FS_SB(sb);
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900452
Namjae Jeona2a4a7e2013-04-20 01:28:40 +0900453 trace_f2fs_sync_fs(sb, sync);
454
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900455 if (!sbi->s_dirty && !get_pages(sbi, F2FS_DIRTY_NODES))
456 return 0;
457
Jaegeuk Kimb7473752013-04-01 08:32:21 +0900458 if (sync) {
459 mutex_lock(&sbi->gc_mutex);
Jaegeuk Kim43727522013-02-04 15:11:17 +0900460 write_checkpoint(sbi, false);
Jaegeuk Kimb7473752013-04-01 08:32:21 +0900461 mutex_unlock(&sbi->gc_mutex);
462 } else {
Jaegeuk Kim7d82db82013-01-11 13:10:49 +0900463 f2fs_balance_fs(sbi);
Jaegeuk Kimb7473752013-04-01 08:32:21 +0900464 }
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900465
Namjae Jeon64c576f2012-12-22 12:10:27 +0900466 return 0;
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900467}
468
Changman Leed6212a52013-01-29 18:30:07 +0900469static int f2fs_freeze(struct super_block *sb)
470{
471 int err;
472
Jaegeuk Kim77888c12013-05-20 20:28:47 +0900473 if (f2fs_readonly(sb))
Changman Leed6212a52013-01-29 18:30:07 +0900474 return 0;
475
476 err = f2fs_sync_fs(sb, 1);
477 return err;
478}
479
480static int f2fs_unfreeze(struct super_block *sb)
481{
482 return 0;
483}
484
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900485static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf)
486{
487 struct super_block *sb = dentry->d_sb;
488 struct f2fs_sb_info *sbi = F2FS_SB(sb);
489 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
490 block_t total_count, user_block_count, start_count, ovp_count;
491
492 total_count = le64_to_cpu(sbi->raw_super->block_count);
493 user_block_count = sbi->user_block_count;
494 start_count = le32_to_cpu(sbi->raw_super->segment0_blkaddr);
495 ovp_count = SM_I(sbi)->ovp_segments << sbi->log_blocks_per_seg;
496 buf->f_type = F2FS_SUPER_MAGIC;
497 buf->f_bsize = sbi->blocksize;
498
499 buf->f_blocks = total_count - start_count;
500 buf->f_bfree = buf->f_blocks - valid_user_blocks(sbi) - ovp_count;
501 buf->f_bavail = user_block_count - valid_user_blocks(sbi);
502
Jaegeuk Kim1362b5e2012-12-12 19:45:49 +0900503 buf->f_files = sbi->total_node_count;
504 buf->f_ffree = sbi->total_node_count - valid_inode_count(sbi);
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900505
Jaegeuk Kim5a20d332013-03-03 13:58:05 +0900506 buf->f_namelen = F2FS_NAME_LEN;
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900507 buf->f_fsid.val[0] = (u32)id;
508 buf->f_fsid.val[1] = (u32)(id >> 32);
509
510 return 0;
511}
512
513static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
514{
515 struct f2fs_sb_info *sbi = F2FS_SB(root->d_sb);
516
Gu Zhengb270ad62014-04-11 17:49:55 +0800517 if (!f2fs_readonly(sbi->sb) && test_opt(sbi, BG_GC))
Namjae Jeon696c0182013-06-16 09:48:48 +0900518 seq_printf(seq, ",background_gc=%s", "on");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900519 else
Namjae Jeon696c0182013-06-16 09:48:48 +0900520 seq_printf(seq, ",background_gc=%s", "off");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900521 if (test_opt(sbi, DISABLE_ROLL_FORWARD))
522 seq_puts(seq, ",disable_roll_forward");
523 if (test_opt(sbi, DISCARD))
524 seq_puts(seq, ",discard");
525 if (test_opt(sbi, NOHEAP))
526 seq_puts(seq, ",no_heap_alloc");
527#ifdef CONFIG_F2FS_FS_XATTR
528 if (test_opt(sbi, XATTR_USER))
529 seq_puts(seq, ",user_xattr");
530 else
531 seq_puts(seq, ",nouser_xattr");
Jaegeuk Kim444c5802013-08-08 15:16:22 +0900532 if (test_opt(sbi, INLINE_XATTR))
533 seq_puts(seq, ",inline_xattr");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900534#endif
535#ifdef CONFIG_F2FS_FS_POSIX_ACL
536 if (test_opt(sbi, POSIX_ACL))
537 seq_puts(seq, ",acl");
538 else
539 seq_puts(seq, ",noacl");
540#endif
541 if (test_opt(sbi, DISABLE_EXT_IDENTIFY))
Alejandro Martinez Ruizaa435072013-01-25 19:08:59 +0100542 seq_puts(seq, ",disable_ext_identify");
Huajun Li8274de72013-11-10 23:13:17 +0800543 if (test_opt(sbi, INLINE_DATA))
544 seq_puts(seq, ",inline_data");
Gu Zhengb270ad62014-04-11 17:49:55 +0800545 if (!f2fs_readonly(sbi->sb) && test_opt(sbi, FLUSH_MERGE))
Jaegeuk Kim6b4afdd2014-04-02 15:34:36 +0900546 seq_puts(seq, ",flush_merge");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900547 seq_printf(seq, ",active_logs=%u", sbi->active_logs);
548
549 return 0;
550}
551
Jaegeuk Kim5e176d52013-06-28 12:47:01 +0900552static int segment_info_seq_show(struct seq_file *seq, void *offset)
553{
554 struct super_block *sb = seq->private;
555 struct f2fs_sb_info *sbi = F2FS_SB(sb);
Chris Fries6c311ec2014-01-17 14:44:39 -0600556 unsigned int total_segs =
557 le32_to_cpu(sbi->raw_super->segment_count_main);
Jaegeuk Kim5e176d52013-06-28 12:47:01 +0900558 int i;
559
Chao Yu90aa6dc2014-03-17 10:31:06 +0800560 seq_puts(seq, "format: segment_type|valid_blocks\n"
561 "segment_type(0:HD, 1:WD, 2:CD, 3:HN, 4:WN, 5:CN)\n");
562
Jaegeuk Kim5e176d52013-06-28 12:47:01 +0900563 for (i = 0; i < total_segs; i++) {
Chao Yu90aa6dc2014-03-17 10:31:06 +0800564 struct seg_entry *se = get_seg_entry(sbi, i);
565
566 if ((i % 10) == 0)
567 seq_printf(seq, "%-5d", i);
568 seq_printf(seq, "%d|%-3u", se->type,
569 get_valid_blocks(sbi, i, 1));
Gu Zheng46c04362014-03-07 18:43:33 +0800570 if ((i % 10) == 9 || i == (total_segs - 1))
571 seq_putc(seq, '\n');
Jaegeuk Kim5e176d52013-06-28 12:47:01 +0900572 else
Gu Zheng46c04362014-03-07 18:43:33 +0800573 seq_putc(seq, ' ');
Jaegeuk Kim5e176d52013-06-28 12:47:01 +0900574 }
Gu Zheng46c04362014-03-07 18:43:33 +0800575
Jaegeuk Kim5e176d52013-06-28 12:47:01 +0900576 return 0;
577}
578
579static int segment_info_open_fs(struct inode *inode, struct file *file)
580{
581 return single_open(file, segment_info_seq_show, PDE_DATA(inode));
582}
583
584static const struct file_operations f2fs_seq_segment_info_fops = {
585 .owner = THIS_MODULE,
586 .open = segment_info_open_fs,
587 .read = seq_read,
588 .llseek = seq_lseek,
589 .release = single_release,
590};
591
Namjae Jeon696c0182013-06-16 09:48:48 +0900592static int f2fs_remount(struct super_block *sb, int *flags, char *data)
593{
594 struct f2fs_sb_info *sbi = F2FS_SB(sb);
595 struct f2fs_mount_info org_mount_opt;
596 int err, active_logs;
Gu Zheng876dc592014-04-11 17:50:00 +0800597 bool need_restart_gc = false;
598 bool need_stop_gc = false;
Namjae Jeon696c0182013-06-16 09:48:48 +0900599
Theodore Ts'o02b99842014-03-13 10:14:33 -0400600 sync_filesystem(sb);
601
Namjae Jeon696c0182013-06-16 09:48:48 +0900602 /*
603 * Save the old mount options in case we
604 * need to restore them.
605 */
606 org_mount_opt = sbi->mount_opt;
607 active_logs = sbi->active_logs;
608
609 /* parse mount options */
610 err = parse_options(sb, data);
611 if (err)
612 goto restore_opts;
613
614 /*
615 * Previous and new state of filesystem is RO,
Gu Zheng876dc592014-04-11 17:50:00 +0800616 * so skip checking GC and FLUSH_MERGE conditions.
Namjae Jeon696c0182013-06-16 09:48:48 +0900617 */
618 if ((sb->s_flags & MS_RDONLY) && (*flags & MS_RDONLY))
619 goto skip;
620
621 /*
622 * We stop the GC thread if FS is mounted as RO
623 * or if background_gc = off is passed in mount
624 * option. Also sync the filesystem.
625 */
626 if ((*flags & MS_RDONLY) || !test_opt(sbi, BG_GC)) {
627 if (sbi->gc_thread) {
628 stop_gc_thread(sbi);
629 f2fs_sync_fs(sb, 1);
Gu Zheng876dc592014-04-11 17:50:00 +0800630 need_restart_gc = true;
Namjae Jeon696c0182013-06-16 09:48:48 +0900631 }
632 } else if (test_opt(sbi, BG_GC) && !sbi->gc_thread) {
633 err = start_gc_thread(sbi);
634 if (err)
635 goto restore_opts;
Gu Zheng876dc592014-04-11 17:50:00 +0800636 need_stop_gc = true;
637 }
638
639 /*
640 * We stop issue flush thread if FS is mounted as RO
641 * or if flush_merge is not passed in mount option.
642 */
643 if ((*flags & MS_RDONLY) || !test_opt(sbi, FLUSH_MERGE)) {
Gu Zhenga688b9d9e2014-04-27 14:21:21 +0800644 struct flush_cmd_control *fcc =
645 sbi->sm_info->cmd_control_info;
Gu Zheng876dc592014-04-11 17:50:00 +0800646
Gu Zhenga688b9d9e2014-04-27 14:21:21 +0800647 if (fcc && fcc->f2fs_issue_flush)
648 kthread_stop(fcc->f2fs_issue_flush);
649 kfree(fcc);
650 sbi->sm_info->cmd_control_info = NULL;
651 } else if (test_opt(sbi, FLUSH_MERGE) &&
652 !sbi->sm_info->cmd_control_info) {
653 dev_t dev = sbi->sb->s_bdev->bd_dev;
654 struct flush_cmd_control *fcc =
655 kzalloc(sizeof(struct flush_cmd_control), GFP_KERNEL);
Gu Zheng876dc592014-04-11 17:50:00 +0800656
Gu Zhenga688b9d9e2014-04-27 14:21:21 +0800657 if (!fcc) {
658 err = -ENOMEM;
659 goto restore_gc;
Gu Zheng876dc592014-04-11 17:50:00 +0800660 }
Gu Zhenga688b9d9e2014-04-27 14:21:21 +0800661 spin_lock_init(&fcc->issue_lock);
662 init_waitqueue_head(&fcc->flush_wait_queue);
663 fcc->f2fs_issue_flush = kthread_run(issue_flush_thread, sbi,
664 "f2fs_flush-%u:%u", MAJOR(dev), MINOR(dev));
665 if (IS_ERR(fcc->f2fs_issue_flush)) {
666 err = PTR_ERR(fcc->f2fs_issue_flush);
667 kfree(fcc);
668 goto restore_gc;
669 }
670 sbi->sm_info->cmd_control_info = fcc;
Namjae Jeon696c0182013-06-16 09:48:48 +0900671 }
672skip:
673 /* Update the POSIXACL Flag */
674 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
675 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
676 return 0;
Gu Zheng876dc592014-04-11 17:50:00 +0800677restore_gc:
678 if (need_restart_gc) {
679 if (start_gc_thread(sbi))
680 f2fs_msg(sbi->sb, KERN_WARNING,
681 "background gc thread is stop");
682 } else if (need_stop_gc) {
683 stop_gc_thread(sbi);
684 }
Namjae Jeon696c0182013-06-16 09:48:48 +0900685restore_opts:
686 sbi->mount_opt = org_mount_opt;
687 sbi->active_logs = active_logs;
688 return err;
689}
690
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900691static struct super_operations f2fs_sops = {
692 .alloc_inode = f2fs_alloc_inode,
Jaegeuk Kim531ad7d2013-04-30 11:33:27 +0900693 .drop_inode = f2fs_drop_inode,
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900694 .destroy_inode = f2fs_destroy_inode,
695 .write_inode = f2fs_write_inode,
Jaegeuk Kimb3783872013-06-10 09:17:01 +0900696 .dirty_inode = f2fs_dirty_inode,
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900697 .show_options = f2fs_show_options,
698 .evict_inode = f2fs_evict_inode,
699 .put_super = f2fs_put_super,
700 .sync_fs = f2fs_sync_fs,
Changman Leed6212a52013-01-29 18:30:07 +0900701 .freeze_fs = f2fs_freeze,
702 .unfreeze_fs = f2fs_unfreeze,
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900703 .statfs = f2fs_statfs,
Namjae Jeon696c0182013-06-16 09:48:48 +0900704 .remount_fs = f2fs_remount,
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900705};
706
707static struct inode *f2fs_nfs_get_inode(struct super_block *sb,
708 u64 ino, u32 generation)
709{
710 struct f2fs_sb_info *sbi = F2FS_SB(sb);
711 struct inode *inode;
712
Jaegeuk Kim6bacf522013-12-06 15:00:58 +0900713 if (unlikely(ino < F2FS_ROOT_INO(sbi)))
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900714 return ERR_PTR(-ESTALE);
Chao Yu910bb122014-03-12 17:08:36 +0800715 if (unlikely(ino >= NM_I(sbi)->max_nid))
716 return ERR_PTR(-ESTALE);
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900717
718 /*
719 * f2fs_iget isn't quite right if the inode is currently unallocated!
720 * However f2fs_iget currently does appropriate checks to handle stale
721 * inodes so everything is OK.
722 */
723 inode = f2fs_iget(sb, ino);
724 if (IS_ERR(inode))
725 return ERR_CAST(inode);
Jaegeuk Kim6bacf522013-12-06 15:00:58 +0900726 if (unlikely(generation && inode->i_generation != generation)) {
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900727 /* we didn't find the right inode.. */
728 iput(inode);
729 return ERR_PTR(-ESTALE);
730 }
731 return inode;
732}
733
734static struct dentry *f2fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
735 int fh_len, int fh_type)
736{
737 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
738 f2fs_nfs_get_inode);
739}
740
741static struct dentry *f2fs_fh_to_parent(struct super_block *sb, struct fid *fid,
742 int fh_len, int fh_type)
743{
744 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
745 f2fs_nfs_get_inode);
746}
747
748static const struct export_operations f2fs_export_ops = {
749 .fh_to_dentry = f2fs_fh_to_dentry,
750 .fh_to_parent = f2fs_fh_to_parent,
751 .get_parent = f2fs_get_parent,
752};
753
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900754static loff_t max_file_size(unsigned bits)
755{
Jaegeuk Kimde936532013-08-12 21:08:03 +0900756 loff_t result = (DEF_ADDRS_PER_INODE - F2FS_INLINE_XATTR_ADDRS);
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900757 loff_t leaf_count = ADDRS_PER_BLOCK;
758
759 /* two direct node blocks */
760 result += (leaf_count * 2);
761
762 /* two indirect node blocks */
763 leaf_count *= NIDS_PER_BLOCK;
764 result += (leaf_count * 2);
765
766 /* one double indirect node block */
767 leaf_count *= NIDS_PER_BLOCK;
768 result += leaf_count;
769
770 result <<= bits;
771 return result;
772}
773
Namjae Jeona07ef782012-12-30 14:52:05 +0900774static int sanity_check_raw_super(struct super_block *sb,
775 struct f2fs_super_block *raw_super)
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900776{
777 unsigned int blocksize;
778
Namjae Jeona07ef782012-12-30 14:52:05 +0900779 if (F2FS_SUPER_MAGIC != le32_to_cpu(raw_super->magic)) {
780 f2fs_msg(sb, KERN_INFO,
781 "Magic Mismatch, valid(0x%x) - read(0x%x)",
782 F2FS_SUPER_MAGIC, le32_to_cpu(raw_super->magic));
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900783 return 1;
Namjae Jeona07ef782012-12-30 14:52:05 +0900784 }
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900785
majianpeng5c9b4692013-02-01 19:07:57 +0800786 /* Currently, support only 4KB page cache size */
787 if (F2FS_BLKSIZE != PAGE_CACHE_SIZE) {
788 f2fs_msg(sb, KERN_INFO,
majianpeng14d7e9d2013-02-01 19:07:03 +0800789 "Invalid page_cache_size (%lu), supports only 4KB\n",
majianpeng5c9b4692013-02-01 19:07:57 +0800790 PAGE_CACHE_SIZE);
791 return 1;
792 }
793
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900794 /* Currently, support only 4KB block size */
795 blocksize = 1 << le32_to_cpu(raw_super->log_blocksize);
majianpeng5c9b4692013-02-01 19:07:57 +0800796 if (blocksize != F2FS_BLKSIZE) {
Namjae Jeona07ef782012-12-30 14:52:05 +0900797 f2fs_msg(sb, KERN_INFO,
798 "Invalid blocksize (%u), supports only 4KB\n",
799 blocksize);
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900800 return 1;
Namjae Jeona07ef782012-12-30 14:52:05 +0900801 }
majianpeng5c9b4692013-02-01 19:07:57 +0800802
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900803 if (le32_to_cpu(raw_super->log_sectorsize) !=
Namjae Jeona07ef782012-12-30 14:52:05 +0900804 F2FS_LOG_SECTOR_SIZE) {
805 f2fs_msg(sb, KERN_INFO, "Invalid log sectorsize");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900806 return 1;
Namjae Jeona07ef782012-12-30 14:52:05 +0900807 }
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900808 if (le32_to_cpu(raw_super->log_sectors_per_block) !=
Namjae Jeona07ef782012-12-30 14:52:05 +0900809 F2FS_LOG_SECTORS_PER_BLOCK) {
810 f2fs_msg(sb, KERN_INFO, "Invalid log sectors per block");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900811 return 1;
Namjae Jeona07ef782012-12-30 14:52:05 +0900812 }
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900813 return 0;
814}
815
Jaegeuk Kim577e3492013-01-24 19:56:11 +0900816static int sanity_check_ckpt(struct f2fs_sb_info *sbi)
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900817{
818 unsigned int total, fsmeta;
Jaegeuk Kim577e3492013-01-24 19:56:11 +0900819 struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
820 struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900821
822 total = le32_to_cpu(raw_super->segment_count);
823 fsmeta = le32_to_cpu(raw_super->segment_count_ckpt);
824 fsmeta += le32_to_cpu(raw_super->segment_count_sit);
825 fsmeta += le32_to_cpu(raw_super->segment_count_nat);
826 fsmeta += le32_to_cpu(ckpt->rsvd_segment_count);
827 fsmeta += le32_to_cpu(raw_super->segment_count_ssa);
828
Jaegeuk Kim6bacf522013-12-06 15:00:58 +0900829 if (unlikely(fsmeta >= total))
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900830 return 1;
Jaegeuk Kim577e3492013-01-24 19:56:11 +0900831
Jaegeuk Kim6bacf522013-12-06 15:00:58 +0900832 if (unlikely(is_set_ckpt_flags(ckpt, CP_ERROR_FLAG))) {
Jaegeuk Kim577e3492013-01-24 19:56:11 +0900833 f2fs_msg(sbi->sb, KERN_ERR, "A bug case: need to run fsck");
834 return 1;
835 }
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900836 return 0;
837}
838
839static void init_sb_info(struct f2fs_sb_info *sbi)
840{
841 struct f2fs_super_block *raw_super = sbi->raw_super;
842 int i;
843
844 sbi->log_sectors_per_block =
845 le32_to_cpu(raw_super->log_sectors_per_block);
846 sbi->log_blocksize = le32_to_cpu(raw_super->log_blocksize);
847 sbi->blocksize = 1 << sbi->log_blocksize;
848 sbi->log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
849 sbi->blocks_per_seg = 1 << sbi->log_blocks_per_seg;
850 sbi->segs_per_sec = le32_to_cpu(raw_super->segs_per_sec);
851 sbi->secs_per_zone = le32_to_cpu(raw_super->secs_per_zone);
852 sbi->total_sections = le32_to_cpu(raw_super->section_count);
853 sbi->total_node_count =
854 (le32_to_cpu(raw_super->segment_count_nat) / 2)
855 * sbi->blocks_per_seg * NAT_ENTRY_PER_BLOCK;
856 sbi->root_ino_num = le32_to_cpu(raw_super->root_ino);
857 sbi->node_ino_num = le32_to_cpu(raw_super->node_ino);
858 sbi->meta_ino_num = le32_to_cpu(raw_super->meta_ino);
Jaegeuk Kim5ec4e492013-03-31 13:26:03 +0900859 sbi->cur_victim_sec = NULL_SECNO;
Jaegeuk Kimb1c57c12014-01-08 13:45:08 +0900860 sbi->max_victim_search = DEF_MAX_VICTIM_SEARCH;
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900861
862 for (i = 0; i < NR_COUNT_TYPE; i++)
863 atomic_set(&sbi->nr_pages[i], 0);
Jaegeuk Kimab9fa662014-02-27 20:09:05 +0900864
865 sbi->dir_level = DEF_DIR_LEVEL;
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900866}
867
Gu Zheng9076a752013-10-14 18:47:11 +0800868/*
869 * Read f2fs raw super block.
870 * Because we have two copies of super block, so read the first one at first,
871 * if the first one is invalid, move to read the second one.
872 */
873static int read_raw_super_block(struct super_block *sb,
874 struct f2fs_super_block **raw_super,
875 struct buffer_head **raw_super_buf)
majianpeng14d7e9d2013-02-01 19:07:03 +0800876{
Gu Zheng9076a752013-10-14 18:47:11 +0800877 int block = 0;
majianpeng14d7e9d2013-02-01 19:07:03 +0800878
Gu Zheng9076a752013-10-14 18:47:11 +0800879retry:
majianpeng14d7e9d2013-02-01 19:07:03 +0800880 *raw_super_buf = sb_bread(sb, block);
881 if (!*raw_super_buf) {
Gu Zheng9076a752013-10-14 18:47:11 +0800882 f2fs_msg(sb, KERN_ERR, "Unable to read %dth superblock",
883 block + 1);
884 if (block == 0) {
885 block++;
886 goto retry;
887 } else {
888 return -EIO;
889 }
majianpeng14d7e9d2013-02-01 19:07:03 +0800890 }
891
892 *raw_super = (struct f2fs_super_block *)
893 ((char *)(*raw_super_buf)->b_data + F2FS_SUPER_OFFSET);
894
895 /* sanity checking of raw super */
Gu Zheng9076a752013-10-14 18:47:11 +0800896 if (sanity_check_raw_super(sb, *raw_super)) {
897 brelse(*raw_super_buf);
Chris Fries6c311ec2014-01-17 14:44:39 -0600898 f2fs_msg(sb, KERN_ERR,
899 "Can't find valid F2FS filesystem in %dth superblock",
900 block + 1);
Jaegeuk Kim6bacf522013-12-06 15:00:58 +0900901 if (block == 0) {
Gu Zheng9076a752013-10-14 18:47:11 +0800902 block++;
903 goto retry;
904 } else {
905 return -EINVAL;
906 }
907 }
majianpeng14d7e9d2013-02-01 19:07:03 +0800908
Gu Zheng9076a752013-10-14 18:47:11 +0800909 return 0;
majianpeng14d7e9d2013-02-01 19:07:03 +0800910}
911
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900912static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
913{
914 struct f2fs_sb_info *sbi;
915 struct f2fs_super_block *raw_super;
916 struct buffer_head *raw_super_buf;
917 struct inode *root;
918 long err = -EINVAL;
Jaegeuk Kim971767c2013-11-18 17:16:17 +0900919 int i;
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900920
921 /* allocate memory for f2fs-specific super block info */
922 sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL);
923 if (!sbi)
924 return -ENOMEM;
925
Namjae Jeonff9234a2013-01-12 14:41:13 +0900926 /* set a block size */
Jaegeuk Kim6bacf522013-12-06 15:00:58 +0900927 if (unlikely(!sb_set_blocksize(sb, F2FS_BLKSIZE))) {
Namjae Jeona07ef782012-12-30 14:52:05 +0900928 f2fs_msg(sb, KERN_ERR, "unable to set blocksize");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900929 goto free_sbi;
Namjae Jeona07ef782012-12-30 14:52:05 +0900930 }
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900931
Gu Zheng9076a752013-10-14 18:47:11 +0800932 err = read_raw_super_block(sb, &raw_super, &raw_super_buf);
933 if (err)
934 goto free_sbi;
935
Gu Zheng5fb08372013-06-07 14:16:53 +0800936 sb->s_fs_info = sbi;
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900937 /* init some FS parameters */
938 sbi->active_logs = NR_CURSEG_TYPE;
939
940 set_opt(sbi, BG_GC);
941
942#ifdef CONFIG_F2FS_FS_XATTR
943 set_opt(sbi, XATTR_USER);
944#endif
945#ifdef CONFIG_F2FS_FS_POSIX_ACL
946 set_opt(sbi, POSIX_ACL);
947#endif
948 /* parse mount options */
Gu Zheng5fb08372013-06-07 14:16:53 +0800949 err = parse_options(sb, (char *)data);
Wei Yongjun66348b72013-04-12 10:23:18 +0800950 if (err)
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900951 goto free_sb_buf;
952
Jaegeuk Kim25ca9232012-11-28 16:12:41 +0900953 sb->s_maxbytes = max_file_size(le32_to_cpu(raw_super->log_blocksize));
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900954 sb->s_max_links = F2FS_LINK_MAX;
955 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
956
957 sb->s_op = &f2fs_sops;
958 sb->s_xattr = f2fs_xattr_handlers;
959 sb->s_export_op = &f2fs_export_ops;
960 sb->s_magic = F2FS_SUPER_MAGIC;
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900961 sb->s_time_gran = 1;
962 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
963 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
964 memcpy(sb->s_uuid, raw_super->uuid, sizeof(raw_super->uuid));
965
966 /* init f2fs-specific super block info */
967 sbi->sb = sb;
968 sbi->raw_super = raw_super;
969 sbi->raw_super_buf = raw_super_buf;
970 mutex_init(&sbi->gc_mutex);
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900971 mutex_init(&sbi->writepages);
972 mutex_init(&sbi->cp_mutex);
Jaegeuk Kim39936832012-11-22 16:21:29 +0900973 mutex_init(&sbi->node_write);
Haicheng Liaabe5132013-10-23 12:39:32 +0800974 sbi->por_doing = false;
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900975 spin_lock_init(&sbi->stat_lock);
Jaegeuk Kim971767c2013-11-18 17:16:17 +0900976
Chao Yudf0f8dc2014-03-22 14:57:23 +0800977 init_rwsem(&sbi->read_io.io_rwsem);
Jaegeuk Kim458e6192013-12-11 13:54:01 +0900978 sbi->read_io.sbi = sbi;
979 sbi->read_io.bio = NULL;
980 for (i = 0; i < NR_PAGE_TYPE; i++) {
Chao Yudf0f8dc2014-03-22 14:57:23 +0800981 init_rwsem(&sbi->write_io[i].io_rwsem);
Jaegeuk Kim458e6192013-12-11 13:54:01 +0900982 sbi->write_io[i].sbi = sbi;
983 sbi->write_io[i].bio = NULL;
984 }
Jaegeuk Kim971767c2013-11-18 17:16:17 +0900985
Gu Zhenge4795562013-09-27 18:08:30 +0800986 init_rwsem(&sbi->cp_rwsem);
Changman Leefb51b5e2013-11-07 12:48:25 +0900987 init_waitqueue_head(&sbi->cp_wait);
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900988 init_sb_info(sbi);
989
990 /* get an inode for meta space */
991 sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi));
992 if (IS_ERR(sbi->meta_inode)) {
Namjae Jeona07ef782012-12-30 14:52:05 +0900993 f2fs_msg(sb, KERN_ERR, "Failed to read F2FS meta data inode");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900994 err = PTR_ERR(sbi->meta_inode);
995 goto free_sb_buf;
996 }
997
998 err = get_valid_checkpoint(sbi);
Namjae Jeona07ef782012-12-30 14:52:05 +0900999 if (err) {
1000 f2fs_msg(sb, KERN_ERR, "Failed to get valid F2FS checkpoint");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09001001 goto free_meta_inode;
Namjae Jeona07ef782012-12-30 14:52:05 +09001002 }
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09001003
1004 /* sanity checking of checkpoint */
1005 err = -EINVAL;
Jaegeuk Kim577e3492013-01-24 19:56:11 +09001006 if (sanity_check_ckpt(sbi)) {
Namjae Jeona07ef782012-12-30 14:52:05 +09001007 f2fs_msg(sb, KERN_ERR, "Invalid F2FS checkpoint");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09001008 goto free_cp;
Namjae Jeona07ef782012-12-30 14:52:05 +09001009 }
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09001010
1011 sbi->total_valid_node_count =
1012 le32_to_cpu(sbi->ckpt->valid_node_count);
1013 sbi->total_valid_inode_count =
1014 le32_to_cpu(sbi->ckpt->valid_inode_count);
1015 sbi->user_block_count = le64_to_cpu(sbi->ckpt->user_block_count);
1016 sbi->total_valid_block_count =
1017 le64_to_cpu(sbi->ckpt->valid_block_count);
1018 sbi->last_valid_block_count = sbi->total_valid_block_count;
1019 sbi->alloc_valid_block_count = 0;
1020 INIT_LIST_HEAD(&sbi->dir_inode_list);
1021 spin_lock_init(&sbi->dir_inode_lock);
1022
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09001023 init_orphan_info(sbi);
1024
1025 /* setup f2fs internal modules */
1026 err = build_segment_manager(sbi);
Namjae Jeona07ef782012-12-30 14:52:05 +09001027 if (err) {
1028 f2fs_msg(sb, KERN_ERR,
1029 "Failed to initialize F2FS segment manager");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09001030 goto free_sm;
Namjae Jeona07ef782012-12-30 14:52:05 +09001031 }
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09001032 err = build_node_manager(sbi);
Namjae Jeona07ef782012-12-30 14:52:05 +09001033 if (err) {
1034 f2fs_msg(sb, KERN_ERR,
1035 "Failed to initialize F2FS node manager");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09001036 goto free_nm;
Namjae Jeona07ef782012-12-30 14:52:05 +09001037 }
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09001038
1039 build_gc_manager(sbi);
1040
1041 /* get an inode for node space */
1042 sbi->node_inode = f2fs_iget(sb, F2FS_NODE_INO(sbi));
1043 if (IS_ERR(sbi->node_inode)) {
Namjae Jeona07ef782012-12-30 14:52:05 +09001044 f2fs_msg(sb, KERN_ERR, "Failed to read node inode");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09001045 err = PTR_ERR(sbi->node_inode);
1046 goto free_nm;
1047 }
1048
1049 /* if there are nt orphan nodes free them */
Chao Yu8f99a942013-11-28 15:43:43 +08001050 recover_orphan_inodes(sbi);
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09001051
1052 /* read root inode and dentry */
1053 root = f2fs_iget(sb, F2FS_ROOT_INO(sbi));
1054 if (IS_ERR(root)) {
Namjae Jeona07ef782012-12-30 14:52:05 +09001055 f2fs_msg(sb, KERN_ERR, "Failed to read root inode");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09001056 err = PTR_ERR(root);
1057 goto free_node_inode;
1058 }
Chao Yu8f99a942013-11-28 15:43:43 +08001059 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1060 err = -EINVAL;
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09001061 goto free_root_inode;
Chao Yu8f99a942013-11-28 15:43:43 +08001062 }
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09001063
1064 sb->s_root = d_make_root(root); /* allocate root dentry */
1065 if (!sb->s_root) {
1066 err = -ENOMEM;
1067 goto free_root_inode;
1068 }
1069
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09001070 err = f2fs_build_stats(sbi);
1071 if (err)
Jaegeuk Kim6437d1b2014-02-19 18:23:32 +09001072 goto free_root_inode;
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09001073
Jaegeuk Kim5e176d52013-06-28 12:47:01 +09001074 if (f2fs_proc_root)
1075 sbi->s_proc = proc_mkdir(sb->s_id, f2fs_proc_root);
1076
1077 if (sbi->s_proc)
1078 proc_create_data("segment_info", S_IRUGO, sbi->s_proc,
1079 &f2fs_seq_segment_info_fops, sb);
1080
Namjae Jeond3ee4562013-03-17 17:26:14 +09001081 if (test_opt(sbi, DISCARD)) {
1082 struct request_queue *q = bdev_get_queue(sb->s_bdev);
1083 if (!blk_queue_discard(q))
1084 f2fs_msg(sb, KERN_WARNING,
1085 "mounting with \"discard\" option, but "
1086 "the device does not support discard");
1087 }
1088
Namjae Jeonb59d0ba2013-08-04 23:09:40 +09001089 sbi->s_kobj.kset = f2fs_kset;
1090 init_completion(&sbi->s_kobj_unregister);
1091 err = kobject_init_and_add(&sbi->s_kobj, &f2fs_ktype, NULL,
1092 "%s", sb->s_id);
1093 if (err)
Jaegeuk Kim6437d1b2014-02-19 18:23:32 +09001094 goto free_proc;
Namjae Jeonb59d0ba2013-08-04 23:09:40 +09001095
Jaegeuk Kim6437d1b2014-02-19 18:23:32 +09001096 /* recover fsynced data */
1097 if (!test_opt(sbi, DISABLE_ROLL_FORWARD)) {
1098 err = recover_fsync_data(sbi);
1099 if (err)
1100 f2fs_msg(sb, KERN_ERR,
1101 "Cannot recover all fsync data errno=%ld", err);
1102 }
1103
1104 /*
1105 * If filesystem is not mounted as read-only then
1106 * do start the gc_thread.
1107 */
1108 if (!(sb->s_flags & MS_RDONLY)) {
1109 /* After POR, we can run background GC thread.*/
1110 err = start_gc_thread(sbi);
1111 if (err)
1112 goto free_kobj;
1113 }
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09001114 return 0;
Jaegeuk Kim6437d1b2014-02-19 18:23:32 +09001115
1116free_kobj:
1117 kobject_del(&sbi->s_kobj);
1118free_proc:
Chao Yu1d15bd22013-11-07 10:14:51 +08001119 if (sbi->s_proc) {
1120 remove_proc_entry("segment_info", sbi->s_proc);
1121 remove_proc_entry(sb->s_id, f2fs_proc_root);
1122 }
1123 f2fs_destroy_stats(sbi);
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09001124free_root_inode:
1125 dput(sb->s_root);
1126 sb->s_root = NULL;
1127free_node_inode:
1128 iput(sbi->node_inode);
1129free_nm:
1130 destroy_node_manager(sbi);
1131free_sm:
1132 destroy_segment_manager(sbi);
1133free_cp:
1134 kfree(sbi->ckpt);
1135free_meta_inode:
1136 make_bad_inode(sbi->meta_inode);
1137 iput(sbi->meta_inode);
1138free_sb_buf:
1139 brelse(raw_super_buf);
1140free_sbi:
1141 kfree(sbi);
1142 return err;
1143}
1144
1145static struct dentry *f2fs_mount(struct file_system_type *fs_type, int flags,
1146 const char *dev_name, void *data)
1147{
1148 return mount_bdev(fs_type, flags, dev_name, data, f2fs_fill_super);
1149}
1150
1151static struct file_system_type f2fs_fs_type = {
1152 .owner = THIS_MODULE,
1153 .name = "f2fs",
1154 .mount = f2fs_mount,
1155 .kill_sb = kill_block_super,
1156 .fs_flags = FS_REQUIRES_DEV,
1157};
Eric W. Biederman7f78e032013-03-02 19:39:14 -08001158MODULE_ALIAS_FS("f2fs");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09001159
Namjae Jeon6e6093a2013-01-17 00:08:30 +09001160static int __init init_inodecache(void)
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09001161{
1162 f2fs_inode_cachep = f2fs_kmem_cache_create("f2fs_inode_cache",
Gu Zhenge8512d22014-03-07 18:43:28 +08001163 sizeof(struct f2fs_inode_info));
Jaegeuk Kim6bacf522013-12-06 15:00:58 +09001164 if (!f2fs_inode_cachep)
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09001165 return -ENOMEM;
1166 return 0;
1167}
1168
1169static void destroy_inodecache(void)
1170{
1171 /*
1172 * Make sure all delayed rcu free inodes are flushed before we
1173 * destroy cache.
1174 */
1175 rcu_barrier();
1176 kmem_cache_destroy(f2fs_inode_cachep);
1177}
1178
1179static int __init init_f2fs_fs(void)
1180{
1181 int err;
1182
1183 err = init_inodecache();
1184 if (err)
1185 goto fail;
1186 err = create_node_manager_caches();
1187 if (err)
Zhao Hongjiang9890ff32013-08-20 16:49:51 +08001188 goto free_inodecache;
Jaegeuk Kim7fd9e542013-11-15 13:55:58 +09001189 err = create_segment_manager_caches();
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09001190 if (err)
Zhao Hongjiang9890ff32013-08-20 16:49:51 +08001191 goto free_node_manager_caches;
Jaegeuk Kim7fd9e542013-11-15 13:55:58 +09001192 err = create_gc_caches();
1193 if (err)
1194 goto free_segment_manager_caches;
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09001195 err = create_checkpoint_caches();
1196 if (err)
Zhao Hongjiang9890ff32013-08-20 16:49:51 +08001197 goto free_gc_caches;
Namjae Jeonb59d0ba2013-08-04 23:09:40 +09001198 f2fs_kset = kset_create_and_add("f2fs", NULL, fs_kobj);
Wei Yongjun6e6b9782013-08-23 08:30:20 +08001199 if (!f2fs_kset) {
1200 err = -ENOMEM;
Zhao Hongjiang9890ff32013-08-20 16:49:51 +08001201 goto free_checkpoint_caches;
Wei Yongjun6e6b9782013-08-23 08:30:20 +08001202 }
Namjae Jeon4589d252013-01-15 19:58:47 +09001203 err = register_filesystem(&f2fs_fs_type);
1204 if (err)
Zhao Hongjiang9890ff32013-08-20 16:49:51 +08001205 goto free_kset;
Namjae Jeon4589d252013-01-15 19:58:47 +09001206 f2fs_create_root_stats();
Jaegeuk Kim5e176d52013-06-28 12:47:01 +09001207 f2fs_proc_root = proc_mkdir("fs/f2fs", NULL);
Zhao Hongjiang9890ff32013-08-20 16:49:51 +08001208 return 0;
1209
1210free_kset:
1211 kset_unregister(f2fs_kset);
1212free_checkpoint_caches:
1213 destroy_checkpoint_caches();
1214free_gc_caches:
1215 destroy_gc_caches();
Jaegeuk Kim7fd9e542013-11-15 13:55:58 +09001216free_segment_manager_caches:
1217 destroy_segment_manager_caches();
Zhao Hongjiang9890ff32013-08-20 16:49:51 +08001218free_node_manager_caches:
1219 destroy_node_manager_caches();
1220free_inodecache:
1221 destroy_inodecache();
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09001222fail:
1223 return err;
1224}
1225
1226static void __exit exit_f2fs_fs(void)
1227{
Jaegeuk Kim5e176d52013-06-28 12:47:01 +09001228 remove_proc_entry("fs/f2fs", NULL);
Namjae Jeon4589d252013-01-15 19:58:47 +09001229 f2fs_destroy_root_stats();
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09001230 unregister_filesystem(&f2fs_fs_type);
1231 destroy_checkpoint_caches();
1232 destroy_gc_caches();
Changman Lee5dcd8a72013-12-11 14:32:13 +09001233 destroy_segment_manager_caches();
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09001234 destroy_node_manager_caches();
1235 destroy_inodecache();
Namjae Jeonb59d0ba2013-08-04 23:09:40 +09001236 kset_unregister(f2fs_kset);
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09001237}
1238
1239module_init(init_f2fs_fs)
1240module_exit(exit_f2fs_fs)
1241
1242MODULE_AUTHOR("Samsung Electronics's Praesto Team");
1243MODULE_DESCRIPTION("Flash Friendly File System");
1244MODULE_LICENSE("GPL");