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f2fs: fix incorrect calculation with total/free inode num
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0a8165d7 1/*
aff063e2
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2 * fs/f2fs/super.c
3 *
4 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
5 * http://www.samsung.com/
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11#include <linux/module.h>
12#include <linux/init.h>
13#include <linux/fs.h>
14#include <linux/statfs.h>
aff063e2
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15#include <linux/buffer_head.h>
16#include <linux/backing-dev.h>
17#include <linux/kthread.h>
18#include <linux/parser.h>
19#include <linux/mount.h>
20#include <linux/seq_file.h>
5e176d54 21#include <linux/proc_fs.h>
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22#include <linux/random.h>
23#include <linux/exportfs.h>
d3ee456d 24#include <linux/blkdev.h>
aff063e2 25#include <linux/f2fs_fs.h>
b59d0bae 26#include <linux/sysfs.h>
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27
28#include "f2fs.h"
29#include "node.h"
5ec4e49f 30#include "segment.h"
aff063e2 31#include "xattr.h"
b59d0bae 32#include "gc.h"
aff063e2 33
a2a4a7e4
NJ
34#define CREATE_TRACE_POINTS
35#include <trace/events/f2fs.h>
36
5e176d54 37static struct proc_dir_entry *f2fs_proc_root;
aff063e2 38static struct kmem_cache *f2fs_inode_cachep;
b59d0bae 39static struct kset *f2fs_kset;
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40
41enum {
696c018c 42 Opt_gc_background,
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43 Opt_disable_roll_forward,
44 Opt_discard,
45 Opt_noheap,
4058c511 46 Opt_user_xattr,
aff063e2 47 Opt_nouser_xattr,
4058c511 48 Opt_acl,
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49 Opt_noacl,
50 Opt_active_logs,
51 Opt_disable_ext_identify,
444c580f 52 Opt_inline_xattr,
8274de77 53 Opt_inline_data,
6b4afdd7 54 Opt_flush_merge,
0f7b2abd 55 Opt_nobarrier,
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56 Opt_err,
57};
58
59static match_table_t f2fs_tokens = {
696c018c 60 {Opt_gc_background, "background_gc=%s"},
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61 {Opt_disable_roll_forward, "disable_roll_forward"},
62 {Opt_discard, "discard"},
63 {Opt_noheap, "no_heap"},
4058c511 64 {Opt_user_xattr, "user_xattr"},
aff063e2 65 {Opt_nouser_xattr, "nouser_xattr"},
4058c511 66 {Opt_acl, "acl"},
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67 {Opt_noacl, "noacl"},
68 {Opt_active_logs, "active_logs=%u"},
69 {Opt_disable_ext_identify, "disable_ext_identify"},
444c580f 70 {Opt_inline_xattr, "inline_xattr"},
8274de77 71 {Opt_inline_data, "inline_data"},
6b4afdd7 72 {Opt_flush_merge, "flush_merge"},
0f7b2abd 73 {Opt_nobarrier, "nobarrier"},
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74 {Opt_err, NULL},
75};
76
b59d0bae 77/* Sysfs support for f2fs */
ea91e9b0
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78enum {
79 GC_THREAD, /* struct f2fs_gc_thread */
80 SM_INFO, /* struct f2fs_sm_info */
cdfc41c1 81 NM_INFO, /* struct f2fs_nm_info */
b1c57c1c 82 F2FS_SBI, /* struct f2fs_sb_info */
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JK
83};
84
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85struct f2fs_attr {
86 struct attribute attr;
87 ssize_t (*show)(struct f2fs_attr *, struct f2fs_sb_info *, char *);
88 ssize_t (*store)(struct f2fs_attr *, struct f2fs_sb_info *,
89 const char *, size_t);
ea91e9b0 90 int struct_type;
b59d0bae
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91 int offset;
92};
93
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94static unsigned char *__struct_ptr(struct f2fs_sb_info *sbi, int struct_type)
95{
96 if (struct_type == GC_THREAD)
97 return (unsigned char *)sbi->gc_thread;
98 else if (struct_type == SM_INFO)
99 return (unsigned char *)SM_I(sbi);
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JK
100 else if (struct_type == NM_INFO)
101 return (unsigned char *)NM_I(sbi);
b1c57c1c
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102 else if (struct_type == F2FS_SBI)
103 return (unsigned char *)sbi;
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104 return NULL;
105}
106
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107static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
108 struct f2fs_sb_info *sbi, char *buf)
109{
ea91e9b0 110 unsigned char *ptr = NULL;
b59d0bae
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111 unsigned int *ui;
112
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113 ptr = __struct_ptr(sbi, a->struct_type);
114 if (!ptr)
b59d0bae
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115 return -EINVAL;
116
ea91e9b0 117 ui = (unsigned int *)(ptr + a->offset);
b59d0bae
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118
119 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
120}
121
122static ssize_t f2fs_sbi_store(struct f2fs_attr *a,
123 struct f2fs_sb_info *sbi,
124 const char *buf, size_t count)
125{
ea91e9b0 126 unsigned char *ptr;
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127 unsigned long t;
128 unsigned int *ui;
129 ssize_t ret;
130
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131 ptr = __struct_ptr(sbi, a->struct_type);
132 if (!ptr)
b59d0bae
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133 return -EINVAL;
134
ea91e9b0 135 ui = (unsigned int *)(ptr + a->offset);
b59d0bae
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136
137 ret = kstrtoul(skip_spaces(buf), 0, &t);
138 if (ret < 0)
139 return ret;
140 *ui = t;
141 return count;
142}
143
144static ssize_t f2fs_attr_show(struct kobject *kobj,
145 struct attribute *attr, char *buf)
146{
147 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
148 s_kobj);
149 struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
150
151 return a->show ? a->show(a, sbi, buf) : 0;
152}
153
154static ssize_t f2fs_attr_store(struct kobject *kobj, struct attribute *attr,
155 const char *buf, size_t len)
156{
157 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
158 s_kobj);
159 struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
160
161 return a->store ? a->store(a, sbi, buf, len) : 0;
162}
163
164static void f2fs_sb_release(struct kobject *kobj)
165{
166 struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
167 s_kobj);
168 complete(&sbi->s_kobj_unregister);
169}
170
ea91e9b0 171#define F2FS_ATTR_OFFSET(_struct_type, _name, _mode, _show, _store, _offset) \
b59d0bae
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172static struct f2fs_attr f2fs_attr_##_name = { \
173 .attr = {.name = __stringify(_name), .mode = _mode }, \
174 .show = _show, \
175 .store = _store, \
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176 .struct_type = _struct_type, \
177 .offset = _offset \
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178}
179
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180#define F2FS_RW_ATTR(struct_type, struct_name, name, elname) \
181 F2FS_ATTR_OFFSET(struct_type, name, 0644, \
182 f2fs_sbi_show, f2fs_sbi_store, \
183 offsetof(struct struct_name, elname))
b59d0bae 184
ea91e9b0
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185F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_min_sleep_time, min_sleep_time);
186F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_max_sleep_time, max_sleep_time);
187F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_no_gc_sleep_time, no_gc_sleep_time);
188F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_idle, gc_idle);
189F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, reclaim_segments, rec_prefree_segments);
7ac8c3b0 190F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, max_small_discards, max_discards);
216fbd64
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191F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, ipu_policy, ipu_policy);
192F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ipu_util, min_ipu_util);
cdfc41c1 193F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ram_thresh, ram_thresh);
b1c57c1c 194F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, max_victim_search, max_victim_search);
ab9fa662 195F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, dir_level, dir_level);
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196
197#define ATTR_LIST(name) (&f2fs_attr_##name.attr)
198static struct attribute *f2fs_attrs[] = {
199 ATTR_LIST(gc_min_sleep_time),
200 ATTR_LIST(gc_max_sleep_time),
201 ATTR_LIST(gc_no_gc_sleep_time),
d2dc095f 202 ATTR_LIST(gc_idle),
ea91e9b0 203 ATTR_LIST(reclaim_segments),
7ac8c3b0 204 ATTR_LIST(max_small_discards),
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205 ATTR_LIST(ipu_policy),
206 ATTR_LIST(min_ipu_util),
b1c57c1c 207 ATTR_LIST(max_victim_search),
ab9fa662 208 ATTR_LIST(dir_level),
cdfc41c1 209 ATTR_LIST(ram_thresh),
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210 NULL,
211};
212
213static const struct sysfs_ops f2fs_attr_ops = {
214 .show = f2fs_attr_show,
215 .store = f2fs_attr_store,
216};
217
218static struct kobj_type f2fs_ktype = {
219 .default_attrs = f2fs_attrs,
220 .sysfs_ops = &f2fs_attr_ops,
221 .release = f2fs_sb_release,
222};
223
a07ef784
NJ
224void f2fs_msg(struct super_block *sb, const char *level, const char *fmt, ...)
225{
226 struct va_format vaf;
227 va_list args;
228
229 va_start(args, fmt);
230 vaf.fmt = fmt;
231 vaf.va = &args;
232 printk("%sF2FS-fs (%s): %pV\n", level, sb->s_id, &vaf);
233 va_end(args);
234}
235
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236static void init_once(void *foo)
237{
238 struct f2fs_inode_info *fi = (struct f2fs_inode_info *) foo;
239
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240 inode_init_once(&fi->vfs_inode);
241}
242
696c018c
NJ
243static int parse_options(struct super_block *sb, char *options)
244{
245 struct f2fs_sb_info *sbi = F2FS_SB(sb);
246 substring_t args[MAX_OPT_ARGS];
247 char *p, *name;
248 int arg = 0;
249
250 if (!options)
251 return 0;
252
253 while ((p = strsep(&options, ",")) != NULL) {
254 int token;
255 if (!*p)
256 continue;
257 /*
258 * Initialize args struct so we know whether arg was
259 * found; some options take optional arguments.
260 */
261 args[0].to = args[0].from = NULL;
262 token = match_token(p, f2fs_tokens, args);
263
264 switch (token) {
265 case Opt_gc_background:
266 name = match_strdup(&args[0]);
267
268 if (!name)
269 return -ENOMEM;
04c09388 270 if (strlen(name) == 2 && !strncmp(name, "on", 2))
696c018c 271 set_opt(sbi, BG_GC);
04c09388 272 else if (strlen(name) == 3 && !strncmp(name, "off", 3))
696c018c
NJ
273 clear_opt(sbi, BG_GC);
274 else {
275 kfree(name);
276 return -EINVAL;
277 }
278 kfree(name);
279 break;
280 case Opt_disable_roll_forward:
281 set_opt(sbi, DISABLE_ROLL_FORWARD);
282 break;
283 case Opt_discard:
284 set_opt(sbi, DISCARD);
285 break;
286 case Opt_noheap:
287 set_opt(sbi, NOHEAP);
288 break;
289#ifdef CONFIG_F2FS_FS_XATTR
4058c511
KA
290 case Opt_user_xattr:
291 set_opt(sbi, XATTR_USER);
292 break;
696c018c
NJ
293 case Opt_nouser_xattr:
294 clear_opt(sbi, XATTR_USER);
295 break;
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296 case Opt_inline_xattr:
297 set_opt(sbi, INLINE_XATTR);
298 break;
696c018c 299#else
4058c511
KA
300 case Opt_user_xattr:
301 f2fs_msg(sb, KERN_INFO,
302 "user_xattr options not supported");
303 break;
696c018c
NJ
304 case Opt_nouser_xattr:
305 f2fs_msg(sb, KERN_INFO,
306 "nouser_xattr options not supported");
307 break;
444c580f
JK
308 case Opt_inline_xattr:
309 f2fs_msg(sb, KERN_INFO,
310 "inline_xattr options not supported");
311 break;
696c018c
NJ
312#endif
313#ifdef CONFIG_F2FS_FS_POSIX_ACL
4058c511
KA
314 case Opt_acl:
315 set_opt(sbi, POSIX_ACL);
316 break;
696c018c
NJ
317 case Opt_noacl:
318 clear_opt(sbi, POSIX_ACL);
319 break;
320#else
4058c511
KA
321 case Opt_acl:
322 f2fs_msg(sb, KERN_INFO, "acl options not supported");
323 break;
696c018c
NJ
324 case Opt_noacl:
325 f2fs_msg(sb, KERN_INFO, "noacl options not supported");
326 break;
327#endif
328 case Opt_active_logs:
329 if (args->from && match_int(args, &arg))
330 return -EINVAL;
331 if (arg != 2 && arg != 4 && arg != NR_CURSEG_TYPE)
332 return -EINVAL;
333 sbi->active_logs = arg;
334 break;
335 case Opt_disable_ext_identify:
336 set_opt(sbi, DISABLE_EXT_IDENTIFY);
337 break;
8274de77
HL
338 case Opt_inline_data:
339 set_opt(sbi, INLINE_DATA);
340 break;
6b4afdd7
JK
341 case Opt_flush_merge:
342 set_opt(sbi, FLUSH_MERGE);
343 break;
0f7b2abd
JK
344 case Opt_nobarrier:
345 set_opt(sbi, NOBARRIER);
346 break;
696c018c
NJ
347 default:
348 f2fs_msg(sb, KERN_ERR,
349 "Unrecognized mount option \"%s\" or missing value",
350 p);
351 return -EINVAL;
352 }
353 }
354 return 0;
355}
356
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357static struct inode *f2fs_alloc_inode(struct super_block *sb)
358{
359 struct f2fs_inode_info *fi;
360
a0acdfe0 361 fi = kmem_cache_alloc(f2fs_inode_cachep, GFP_F2FS_ZERO);
aff063e2
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362 if (!fi)
363 return NULL;
364
365 init_once((void *) fi);
366
434720fa 367 /* Initialize f2fs-specific inode info */
aff063e2
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368 fi->vfs_inode.i_version = 1;
369 atomic_set(&fi->dirty_dents, 0);
370 fi->i_current_depth = 1;
371 fi->i_advise = 0;
372 rwlock_init(&fi->ext.ext_lock);
d928bfbf 373 init_rwsem(&fi->i_sem);
aff063e2
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374
375 set_inode_flag(fi, FI_NEW_INODE);
376
444c580f
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377 if (test_opt(F2FS_SB(sb), INLINE_XATTR))
378 set_inode_flag(fi, FI_INLINE_XATTR);
379
ab9fa662
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380 /* Will be used by directory only */
381 fi->i_dir_level = F2FS_SB(sb)->dir_level;
382
aff063e2
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383 return &fi->vfs_inode;
384}
385
531ad7d5
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386static int f2fs_drop_inode(struct inode *inode)
387{
388 /*
389 * This is to avoid a deadlock condition like below.
390 * writeback_single_inode(inode)
391 * - f2fs_write_data_page
392 * - f2fs_gc -> iput -> evict
393 * - inode_wait_for_writeback(inode)
394 */
395 if (!inode_unhashed(inode) && inode->i_state & I_SYNC)
396 return 0;
397 return generic_drop_inode(inode);
398}
399
b3783873
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400/*
401 * f2fs_dirty_inode() is called from __mark_inode_dirty()
402 *
403 * We should call set_dirty_inode to write the dirty inode through write_inode.
404 */
405static void f2fs_dirty_inode(struct inode *inode, int flags)
406{
407 set_inode_flag(F2FS_I(inode), FI_DIRTY_INODE);
b3783873
JK
408}
409
aff063e2
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410static void f2fs_i_callback(struct rcu_head *head)
411{
412 struct inode *inode = container_of(head, struct inode, i_rcu);
413 kmem_cache_free(f2fs_inode_cachep, F2FS_I(inode));
414}
415
25ca923b 416static void f2fs_destroy_inode(struct inode *inode)
aff063e2
JK
417{
418 call_rcu(&inode->i_rcu, f2fs_i_callback);
419}
420
421static void f2fs_put_super(struct super_block *sb)
422{
423 struct f2fs_sb_info *sbi = F2FS_SB(sb);
424
5e176d54
JK
425 if (sbi->s_proc) {
426 remove_proc_entry("segment_info", sbi->s_proc);
427 remove_proc_entry(sb->s_id, f2fs_proc_root);
428 }
b59d0bae 429 kobject_del(&sbi->s_kobj);
5e176d54 430
aff063e2
JK
431 f2fs_destroy_stats(sbi);
432 stop_gc_thread(sbi);
433
5887d291 434 /* We don't need to do checkpoint when it's clean */
97c3c5ca 435 if (sbi->s_dirty)
5887d291 436 write_checkpoint(sbi, true);
aff063e2 437
cf779cab
JK
438 /*
439 * normally superblock is clean, so we need to release this.
440 * In addition, EIO will skip do checkpoint, we need this as well.
441 */
6f12ac25
JK
442 release_dirty_inode(sbi);
443
aff063e2
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444 iput(sbi->node_inode);
445 iput(sbi->meta_inode);
446
447 /* destroy f2fs internal modules */
448 destroy_node_manager(sbi);
449 destroy_segment_manager(sbi);
450
451 kfree(sbi->ckpt);
b59d0bae
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452 kobject_put(&sbi->s_kobj);
453 wait_for_completion(&sbi->s_kobj_unregister);
aff063e2
JK
454
455 sb->s_fs_info = NULL;
456 brelse(sbi->raw_super_buf);
457 kfree(sbi);
458}
459
460int f2fs_sync_fs(struct super_block *sb, int sync)
461{
462 struct f2fs_sb_info *sbi = F2FS_SB(sb);
aff063e2 463
a2a4a7e4
NJ
464 trace_f2fs_sync_fs(sb, sync);
465
b7473754
JK
466 if (sync) {
467 mutex_lock(&sbi->gc_mutex);
43727527 468 write_checkpoint(sbi, false);
b7473754
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469 mutex_unlock(&sbi->gc_mutex);
470 } else {
7d82db83 471 f2fs_balance_fs(sbi);
b7473754 472 }
aff063e2 473
64c576fe 474 return 0;
aff063e2
JK
475}
476
d6212a5f
CL
477static int f2fs_freeze(struct super_block *sb)
478{
479 int err;
480
77888c1e 481 if (f2fs_readonly(sb))
d6212a5f
CL
482 return 0;
483
484 err = f2fs_sync_fs(sb, 1);
485 return err;
486}
487
488static int f2fs_unfreeze(struct super_block *sb)
489{
490 return 0;
491}
492
aff063e2
JK
493static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf)
494{
495 struct super_block *sb = dentry->d_sb;
496 struct f2fs_sb_info *sbi = F2FS_SB(sb);
497 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
498 block_t total_count, user_block_count, start_count, ovp_count;
499
500 total_count = le64_to_cpu(sbi->raw_super->block_count);
501 user_block_count = sbi->user_block_count;
502 start_count = le32_to_cpu(sbi->raw_super->segment0_blkaddr);
503 ovp_count = SM_I(sbi)->ovp_segments << sbi->log_blocks_per_seg;
504 buf->f_type = F2FS_SUPER_MAGIC;
505 buf->f_bsize = sbi->blocksize;
506
507 buf->f_blocks = total_count - start_count;
508 buf->f_bfree = buf->f_blocks - valid_user_blocks(sbi) - ovp_count;
509 buf->f_bavail = user_block_count - valid_user_blocks(sbi);
510
c200b1aa
CY
511 buf->f_files = sbi->total_node_count - F2FS_RESERVED_NODE_NUM;
512 buf->f_ffree = buf->f_files - valid_inode_count(sbi);
aff063e2 513
5a20d339 514 buf->f_namelen = F2FS_NAME_LEN;
aff063e2
JK
515 buf->f_fsid.val[0] = (u32)id;
516 buf->f_fsid.val[1] = (u32)(id >> 32);
517
518 return 0;
519}
520
521static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
522{
523 struct f2fs_sb_info *sbi = F2FS_SB(root->d_sb);
524
b270ad6f 525 if (!f2fs_readonly(sbi->sb) && test_opt(sbi, BG_GC))
696c018c 526 seq_printf(seq, ",background_gc=%s", "on");
aff063e2 527 else
696c018c 528 seq_printf(seq, ",background_gc=%s", "off");
aff063e2
JK
529 if (test_opt(sbi, DISABLE_ROLL_FORWARD))
530 seq_puts(seq, ",disable_roll_forward");
531 if (test_opt(sbi, DISCARD))
532 seq_puts(seq, ",discard");
533 if (test_opt(sbi, NOHEAP))
534 seq_puts(seq, ",no_heap_alloc");
535#ifdef CONFIG_F2FS_FS_XATTR
536 if (test_opt(sbi, XATTR_USER))
537 seq_puts(seq, ",user_xattr");
538 else
539 seq_puts(seq, ",nouser_xattr");
444c580f
JK
540 if (test_opt(sbi, INLINE_XATTR))
541 seq_puts(seq, ",inline_xattr");
aff063e2
JK
542#endif
543#ifdef CONFIG_F2FS_FS_POSIX_ACL
544 if (test_opt(sbi, POSIX_ACL))
545 seq_puts(seq, ",acl");
546 else
547 seq_puts(seq, ",noacl");
548#endif
549 if (test_opt(sbi, DISABLE_EXT_IDENTIFY))
aa43507f 550 seq_puts(seq, ",disable_ext_identify");
8274de77
HL
551 if (test_opt(sbi, INLINE_DATA))
552 seq_puts(seq, ",inline_data");
b270ad6f 553 if (!f2fs_readonly(sbi->sb) && test_opt(sbi, FLUSH_MERGE))
6b4afdd7 554 seq_puts(seq, ",flush_merge");
0f7b2abd
JK
555 if (test_opt(sbi, NOBARRIER))
556 seq_puts(seq, ",nobarrier");
aff063e2
JK
557 seq_printf(seq, ",active_logs=%u", sbi->active_logs);
558
559 return 0;
560}
561
5e176d54
JK
562static int segment_info_seq_show(struct seq_file *seq, void *offset)
563{
564 struct super_block *sb = seq->private;
565 struct f2fs_sb_info *sbi = F2FS_SB(sb);
6c311ec6
CF
566 unsigned int total_segs =
567 le32_to_cpu(sbi->raw_super->segment_count_main);
5e176d54
JK
568 int i;
569
90aa6dc9
CY
570 seq_puts(seq, "format: segment_type|valid_blocks\n"
571 "segment_type(0:HD, 1:WD, 2:CD, 3:HN, 4:WN, 5:CN)\n");
572
5e176d54 573 for (i = 0; i < total_segs; i++) {
90aa6dc9
CY
574 struct seg_entry *se = get_seg_entry(sbi, i);
575
576 if ((i % 10) == 0)
577 seq_printf(seq, "%-5d", i);
578 seq_printf(seq, "%d|%-3u", se->type,
579 get_valid_blocks(sbi, i, 1));
46c04366
GZ
580 if ((i % 10) == 9 || i == (total_segs - 1))
581 seq_putc(seq, '\n');
5e176d54 582 else
46c04366 583 seq_putc(seq, ' ');
5e176d54 584 }
46c04366 585
5e176d54
JK
586 return 0;
587}
588
589static int segment_info_open_fs(struct inode *inode, struct file *file)
590{
591 return single_open(file, segment_info_seq_show, PDE_DATA(inode));
592}
593
594static const struct file_operations f2fs_seq_segment_info_fops = {
595 .owner = THIS_MODULE,
596 .open = segment_info_open_fs,
597 .read = seq_read,
598 .llseek = seq_lseek,
599 .release = single_release,
600};
601
696c018c
NJ
602static int f2fs_remount(struct super_block *sb, int *flags, char *data)
603{
604 struct f2fs_sb_info *sbi = F2FS_SB(sb);
605 struct f2fs_mount_info org_mount_opt;
606 int err, active_logs;
876dc59e
GZ
607 bool need_restart_gc = false;
608 bool need_stop_gc = false;
696c018c 609
02b9984d
TT
610 sync_filesystem(sb);
611
696c018c
NJ
612 /*
613 * Save the old mount options in case we
614 * need to restore them.
615 */
616 org_mount_opt = sbi->mount_opt;
617 active_logs = sbi->active_logs;
618
619 /* parse mount options */
620 err = parse_options(sb, data);
621 if (err)
622 goto restore_opts;
623
624 /*
625 * Previous and new state of filesystem is RO,
876dc59e 626 * so skip checking GC and FLUSH_MERGE conditions.
696c018c 627 */
6b2920a5 628 if (f2fs_readonly(sb) && (*flags & MS_RDONLY))
696c018c
NJ
629 goto skip;
630
631 /*
632 * We stop the GC thread if FS is mounted as RO
633 * or if background_gc = off is passed in mount
634 * option. Also sync the filesystem.
635 */
636 if ((*flags & MS_RDONLY) || !test_opt(sbi, BG_GC)) {
637 if (sbi->gc_thread) {
638 stop_gc_thread(sbi);
639 f2fs_sync_fs(sb, 1);
876dc59e 640 need_restart_gc = true;
696c018c
NJ
641 }
642 } else if (test_opt(sbi, BG_GC) && !sbi->gc_thread) {
643 err = start_gc_thread(sbi);
644 if (err)
645 goto restore_opts;
876dc59e
GZ
646 need_stop_gc = true;
647 }
648
649 /*
650 * We stop issue flush thread if FS is mounted as RO
651 * or if flush_merge is not passed in mount option.
652 */
653 if ((*flags & MS_RDONLY) || !test_opt(sbi, FLUSH_MERGE)) {
2163d198 654 destroy_flush_cmd_control(sbi);
6b2920a5 655 } else if (test_opt(sbi, FLUSH_MERGE) && !SM_I(sbi)->cmd_control_info) {
2163d198
GZ
656 err = create_flush_cmd_control(sbi);
657 if (err)
a688b9d9 658 goto restore_gc;
696c018c
NJ
659 }
660skip:
661 /* Update the POSIXACL Flag */
662 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
663 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
664 return 0;
876dc59e
GZ
665restore_gc:
666 if (need_restart_gc) {
667 if (start_gc_thread(sbi))
668 f2fs_msg(sbi->sb, KERN_WARNING,
e1c42045 669 "background gc thread has stopped");
876dc59e
GZ
670 } else if (need_stop_gc) {
671 stop_gc_thread(sbi);
672 }
696c018c
NJ
673restore_opts:
674 sbi->mount_opt = org_mount_opt;
675 sbi->active_logs = active_logs;
676 return err;
677}
678
aff063e2
JK
679static struct super_operations f2fs_sops = {
680 .alloc_inode = f2fs_alloc_inode,
531ad7d5 681 .drop_inode = f2fs_drop_inode,
aff063e2
JK
682 .destroy_inode = f2fs_destroy_inode,
683 .write_inode = f2fs_write_inode,
b3783873 684 .dirty_inode = f2fs_dirty_inode,
aff063e2
JK
685 .show_options = f2fs_show_options,
686 .evict_inode = f2fs_evict_inode,
687 .put_super = f2fs_put_super,
688 .sync_fs = f2fs_sync_fs,
d6212a5f
CL
689 .freeze_fs = f2fs_freeze,
690 .unfreeze_fs = f2fs_unfreeze,
aff063e2 691 .statfs = f2fs_statfs,
696c018c 692 .remount_fs = f2fs_remount,
aff063e2
JK
693};
694
695static struct inode *f2fs_nfs_get_inode(struct super_block *sb,
696 u64 ino, u32 generation)
697{
698 struct f2fs_sb_info *sbi = F2FS_SB(sb);
699 struct inode *inode;
700
d6b7d4b3 701 if (check_nid_range(sbi, ino))
910bb12d 702 return ERR_PTR(-ESTALE);
aff063e2
JK
703
704 /*
705 * f2fs_iget isn't quite right if the inode is currently unallocated!
706 * However f2fs_iget currently does appropriate checks to handle stale
707 * inodes so everything is OK.
708 */
709 inode = f2fs_iget(sb, ino);
710 if (IS_ERR(inode))
711 return ERR_CAST(inode);
6bacf52f 712 if (unlikely(generation && inode->i_generation != generation)) {
aff063e2
JK
713 /* we didn't find the right inode.. */
714 iput(inode);
715 return ERR_PTR(-ESTALE);
716 }
717 return inode;
718}
719
720static struct dentry *f2fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
721 int fh_len, int fh_type)
722{
723 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
724 f2fs_nfs_get_inode);
725}
726
727static struct dentry *f2fs_fh_to_parent(struct super_block *sb, struct fid *fid,
728 int fh_len, int fh_type)
729{
730 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
731 f2fs_nfs_get_inode);
732}
733
734static const struct export_operations f2fs_export_ops = {
735 .fh_to_dentry = f2fs_fh_to_dentry,
736 .fh_to_parent = f2fs_fh_to_parent,
737 .get_parent = f2fs_get_parent,
738};
739
aff063e2
JK
740static loff_t max_file_size(unsigned bits)
741{
de93653f 742 loff_t result = (DEF_ADDRS_PER_INODE - F2FS_INLINE_XATTR_ADDRS);
aff063e2
JK
743 loff_t leaf_count = ADDRS_PER_BLOCK;
744
745 /* two direct node blocks */
746 result += (leaf_count * 2);
747
748 /* two indirect node blocks */
749 leaf_count *= NIDS_PER_BLOCK;
750 result += (leaf_count * 2);
751
752 /* one double indirect node block */
753 leaf_count *= NIDS_PER_BLOCK;
754 result += leaf_count;
755
756 result <<= bits;
757 return result;
758}
759
a07ef784
NJ
760static int sanity_check_raw_super(struct super_block *sb,
761 struct f2fs_super_block *raw_super)
aff063e2
JK
762{
763 unsigned int blocksize;
764
a07ef784
NJ
765 if (F2FS_SUPER_MAGIC != le32_to_cpu(raw_super->magic)) {
766 f2fs_msg(sb, KERN_INFO,
767 "Magic Mismatch, valid(0x%x) - read(0x%x)",
768 F2FS_SUPER_MAGIC, le32_to_cpu(raw_super->magic));
aff063e2 769 return 1;
a07ef784 770 }
aff063e2 771
5c9b4692 772 /* Currently, support only 4KB page cache size */
773 if (F2FS_BLKSIZE != PAGE_CACHE_SIZE) {
774 f2fs_msg(sb, KERN_INFO,
14d7e9de 775 "Invalid page_cache_size (%lu), supports only 4KB\n",
5c9b4692 776 PAGE_CACHE_SIZE);
777 return 1;
778 }
779
aff063e2
JK
780 /* Currently, support only 4KB block size */
781 blocksize = 1 << le32_to_cpu(raw_super->log_blocksize);
5c9b4692 782 if (blocksize != F2FS_BLKSIZE) {
a07ef784
NJ
783 f2fs_msg(sb, KERN_INFO,
784 "Invalid blocksize (%u), supports only 4KB\n",
785 blocksize);
aff063e2 786 return 1;
a07ef784 787 }
5c9b4692 788
aff063e2 789 if (le32_to_cpu(raw_super->log_sectorsize) !=
a07ef784
NJ
790 F2FS_LOG_SECTOR_SIZE) {
791 f2fs_msg(sb, KERN_INFO, "Invalid log sectorsize");
aff063e2 792 return 1;
a07ef784 793 }
aff063e2 794 if (le32_to_cpu(raw_super->log_sectors_per_block) !=
a07ef784
NJ
795 F2FS_LOG_SECTORS_PER_BLOCK) {
796 f2fs_msg(sb, KERN_INFO, "Invalid log sectors per block");
aff063e2 797 return 1;
a07ef784 798 }
aff063e2
JK
799 return 0;
800}
801
577e3495 802static int sanity_check_ckpt(struct f2fs_sb_info *sbi)
aff063e2
JK
803{
804 unsigned int total, fsmeta;
577e3495
JK
805 struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
806 struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
aff063e2
JK
807
808 total = le32_to_cpu(raw_super->segment_count);
809 fsmeta = le32_to_cpu(raw_super->segment_count_ckpt);
810 fsmeta += le32_to_cpu(raw_super->segment_count_sit);
811 fsmeta += le32_to_cpu(raw_super->segment_count_nat);
812 fsmeta += le32_to_cpu(ckpt->rsvd_segment_count);
813 fsmeta += le32_to_cpu(raw_super->segment_count_ssa);
814
6bacf52f 815 if (unlikely(fsmeta >= total))
aff063e2 816 return 1;
577e3495 817
1e968fdf 818 if (unlikely(f2fs_cp_error(sbi))) {
577e3495
JK
819 f2fs_msg(sbi->sb, KERN_ERR, "A bug case: need to run fsck");
820 return 1;
821 }
aff063e2
JK
822 return 0;
823}
824
825static void init_sb_info(struct f2fs_sb_info *sbi)
826{
827 struct f2fs_super_block *raw_super = sbi->raw_super;
828 int i;
829
830 sbi->log_sectors_per_block =
831 le32_to_cpu(raw_super->log_sectors_per_block);
832 sbi->log_blocksize = le32_to_cpu(raw_super->log_blocksize);
833 sbi->blocksize = 1 << sbi->log_blocksize;
834 sbi->log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
835 sbi->blocks_per_seg = 1 << sbi->log_blocks_per_seg;
836 sbi->segs_per_sec = le32_to_cpu(raw_super->segs_per_sec);
837 sbi->secs_per_zone = le32_to_cpu(raw_super->secs_per_zone);
838 sbi->total_sections = le32_to_cpu(raw_super->section_count);
839 sbi->total_node_count =
840 (le32_to_cpu(raw_super->segment_count_nat) / 2)
841 * sbi->blocks_per_seg * NAT_ENTRY_PER_BLOCK;
842 sbi->root_ino_num = le32_to_cpu(raw_super->root_ino);
843 sbi->node_ino_num = le32_to_cpu(raw_super->node_ino);
844 sbi->meta_ino_num = le32_to_cpu(raw_super->meta_ino);
5ec4e49f 845 sbi->cur_victim_sec = NULL_SECNO;
b1c57c1c 846 sbi->max_victim_search = DEF_MAX_VICTIM_SEARCH;
aff063e2
JK
847
848 for (i = 0; i < NR_COUNT_TYPE; i++)
849 atomic_set(&sbi->nr_pages[i], 0);
ab9fa662
JK
850
851 sbi->dir_level = DEF_DIR_LEVEL;
aff063e2
JK
852}
853
9076a75f
GZ
854/*
855 * Read f2fs raw super block.
856 * Because we have two copies of super block, so read the first one at first,
857 * if the first one is invalid, move to read the second one.
858 */
859static int read_raw_super_block(struct super_block *sb,
860 struct f2fs_super_block **raw_super,
861 struct buffer_head **raw_super_buf)
14d7e9de 862{
9076a75f 863 int block = 0;
14d7e9de 864
9076a75f 865retry:
14d7e9de 866 *raw_super_buf = sb_bread(sb, block);
867 if (!*raw_super_buf) {
9076a75f
GZ
868 f2fs_msg(sb, KERN_ERR, "Unable to read %dth superblock",
869 block + 1);
870 if (block == 0) {
871 block++;
872 goto retry;
873 } else {
874 return -EIO;
875 }
14d7e9de 876 }
877
878 *raw_super = (struct f2fs_super_block *)
879 ((char *)(*raw_super_buf)->b_data + F2FS_SUPER_OFFSET);
880
881 /* sanity checking of raw super */
9076a75f
GZ
882 if (sanity_check_raw_super(sb, *raw_super)) {
883 brelse(*raw_super_buf);
6c311ec6
CF
884 f2fs_msg(sb, KERN_ERR,
885 "Can't find valid F2FS filesystem in %dth superblock",
886 block + 1);
6bacf52f 887 if (block == 0) {
9076a75f
GZ
888 block++;
889 goto retry;
890 } else {
891 return -EINVAL;
892 }
893 }
14d7e9de 894
9076a75f 895 return 0;
14d7e9de 896}
897
aff063e2
JK
898static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
899{
900 struct f2fs_sb_info *sbi;
901 struct f2fs_super_block *raw_super;
902 struct buffer_head *raw_super_buf;
903 struct inode *root;
904 long err = -EINVAL;
ed2e621a 905 bool retry = true;
971767ca 906 int i;
aff063e2 907
ed2e621a 908try_onemore:
aff063e2
JK
909 /* allocate memory for f2fs-specific super block info */
910 sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL);
911 if (!sbi)
912 return -ENOMEM;
913
ff9234ad 914 /* set a block size */
6bacf52f 915 if (unlikely(!sb_set_blocksize(sb, F2FS_BLKSIZE))) {
a07ef784 916 f2fs_msg(sb, KERN_ERR, "unable to set blocksize");
aff063e2 917 goto free_sbi;
a07ef784 918 }
aff063e2 919
9076a75f
GZ
920 err = read_raw_super_block(sb, &raw_super, &raw_super_buf);
921 if (err)
922 goto free_sbi;
923
5fb08372 924 sb->s_fs_info = sbi;
aff063e2
JK
925 /* init some FS parameters */
926 sbi->active_logs = NR_CURSEG_TYPE;
927
928 set_opt(sbi, BG_GC);
929
930#ifdef CONFIG_F2FS_FS_XATTR
931 set_opt(sbi, XATTR_USER);
932#endif
933#ifdef CONFIG_F2FS_FS_POSIX_ACL
934 set_opt(sbi, POSIX_ACL);
935#endif
936 /* parse mount options */
5fb08372 937 err = parse_options(sb, (char *)data);
66348b72 938 if (err)
aff063e2
JK
939 goto free_sb_buf;
940
25ca923b 941 sb->s_maxbytes = max_file_size(le32_to_cpu(raw_super->log_blocksize));
aff063e2
JK
942 sb->s_max_links = F2FS_LINK_MAX;
943 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
944
945 sb->s_op = &f2fs_sops;
946 sb->s_xattr = f2fs_xattr_handlers;
947 sb->s_export_op = &f2fs_export_ops;
948 sb->s_magic = F2FS_SUPER_MAGIC;
aff063e2
JK
949 sb->s_time_gran = 1;
950 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
951 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
952 memcpy(sb->s_uuid, raw_super->uuid, sizeof(raw_super->uuid));
953
954 /* init f2fs-specific super block info */
955 sbi->sb = sb;
956 sbi->raw_super = raw_super;
957 sbi->raw_super_buf = raw_super_buf;
958 mutex_init(&sbi->gc_mutex);
aff063e2
JK
959 mutex_init(&sbi->writepages);
960 mutex_init(&sbi->cp_mutex);
b3582c68 961 init_rwsem(&sbi->node_write);
aabe5136 962 sbi->por_doing = false;
aff063e2 963 spin_lock_init(&sbi->stat_lock);
971767ca 964
df0f8dc0 965 init_rwsem(&sbi->read_io.io_rwsem);
458e6197
JK
966 sbi->read_io.sbi = sbi;
967 sbi->read_io.bio = NULL;
968 for (i = 0; i < NR_PAGE_TYPE; i++) {
df0f8dc0 969 init_rwsem(&sbi->write_io[i].io_rwsem);
458e6197
JK
970 sbi->write_io[i].sbi = sbi;
971 sbi->write_io[i].bio = NULL;
972 }
971767ca 973
e479556b 974 init_rwsem(&sbi->cp_rwsem);
fb51b5ef 975 init_waitqueue_head(&sbi->cp_wait);
aff063e2
JK
976 init_sb_info(sbi);
977
978 /* get an inode for meta space */
979 sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi));
980 if (IS_ERR(sbi->meta_inode)) {
a07ef784 981 f2fs_msg(sb, KERN_ERR, "Failed to read F2FS meta data inode");
aff063e2
JK
982 err = PTR_ERR(sbi->meta_inode);
983 goto free_sb_buf;
984 }
985
986 err = get_valid_checkpoint(sbi);
a07ef784
NJ
987 if (err) {
988 f2fs_msg(sb, KERN_ERR, "Failed to get valid F2FS checkpoint");
aff063e2 989 goto free_meta_inode;
a07ef784 990 }
aff063e2
JK
991
992 /* sanity checking of checkpoint */
993 err = -EINVAL;
577e3495 994 if (sanity_check_ckpt(sbi)) {
a07ef784 995 f2fs_msg(sb, KERN_ERR, "Invalid F2FS checkpoint");
aff063e2 996 goto free_cp;
a07ef784 997 }
aff063e2
JK
998
999 sbi->total_valid_node_count =
1000 le32_to_cpu(sbi->ckpt->valid_node_count);
1001 sbi->total_valid_inode_count =
1002 le32_to_cpu(sbi->ckpt->valid_inode_count);
1003 sbi->user_block_count = le64_to_cpu(sbi->ckpt->user_block_count);
1004 sbi->total_valid_block_count =
1005 le64_to_cpu(sbi->ckpt->valid_block_count);
1006 sbi->last_valid_block_count = sbi->total_valid_block_count;
1007 sbi->alloc_valid_block_count = 0;
1008 INIT_LIST_HEAD(&sbi->dir_inode_list);
1009 spin_lock_init(&sbi->dir_inode_lock);
1010
6451e041 1011 init_ino_entry_info(sbi);
aff063e2
JK
1012
1013 /* setup f2fs internal modules */
1014 err = build_segment_manager(sbi);
a07ef784
NJ
1015 if (err) {
1016 f2fs_msg(sb, KERN_ERR,
1017 "Failed to initialize F2FS segment manager");
aff063e2 1018 goto free_sm;
a07ef784 1019 }
aff063e2 1020 err = build_node_manager(sbi);
a07ef784
NJ
1021 if (err) {
1022 f2fs_msg(sb, KERN_ERR,
1023 "Failed to initialize F2FS node manager");
aff063e2 1024 goto free_nm;
a07ef784 1025 }
aff063e2
JK
1026
1027 build_gc_manager(sbi);
1028
1029 /* get an inode for node space */
1030 sbi->node_inode = f2fs_iget(sb, F2FS_NODE_INO(sbi));
1031 if (IS_ERR(sbi->node_inode)) {
a07ef784 1032 f2fs_msg(sb, KERN_ERR, "Failed to read node inode");
aff063e2
JK
1033 err = PTR_ERR(sbi->node_inode);
1034 goto free_nm;
1035 }
1036
1037 /* if there are nt orphan nodes free them */
8f99a946 1038 recover_orphan_inodes(sbi);
aff063e2
JK
1039
1040 /* read root inode and dentry */
1041 root = f2fs_iget(sb, F2FS_ROOT_INO(sbi));
1042 if (IS_ERR(root)) {
a07ef784 1043 f2fs_msg(sb, KERN_ERR, "Failed to read root inode");
aff063e2
JK
1044 err = PTR_ERR(root);
1045 goto free_node_inode;
1046 }
8f99a946 1047 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
9d847950 1048 iput(root);
8f99a946 1049 err = -EINVAL;
9d847950 1050 goto free_node_inode;
8f99a946 1051 }
aff063e2
JK
1052
1053 sb->s_root = d_make_root(root); /* allocate root dentry */
1054 if (!sb->s_root) {
1055 err = -ENOMEM;
1056 goto free_root_inode;
1057 }
1058
aff063e2
JK
1059 err = f2fs_build_stats(sbi);
1060 if (err)
6437d1b0 1061 goto free_root_inode;
aff063e2 1062
5e176d54
JK
1063 if (f2fs_proc_root)
1064 sbi->s_proc = proc_mkdir(sb->s_id, f2fs_proc_root);
1065
1066 if (sbi->s_proc)
1067 proc_create_data("segment_info", S_IRUGO, sbi->s_proc,
1068 &f2fs_seq_segment_info_fops, sb);
1069
d3ee456d
NJ
1070 if (test_opt(sbi, DISCARD)) {
1071 struct request_queue *q = bdev_get_queue(sb->s_bdev);
1072 if (!blk_queue_discard(q))
1073 f2fs_msg(sb, KERN_WARNING,
1074 "mounting with \"discard\" option, but "
1075 "the device does not support discard");
1076 }
1077
b59d0bae
NJ
1078 sbi->s_kobj.kset = f2fs_kset;
1079 init_completion(&sbi->s_kobj_unregister);
1080 err = kobject_init_and_add(&sbi->s_kobj, &f2fs_ktype, NULL,
1081 "%s", sb->s_id);
1082 if (err)
6437d1b0 1083 goto free_proc;
b59d0bae 1084
6437d1b0
JK
1085 /* recover fsynced data */
1086 if (!test_opt(sbi, DISABLE_ROLL_FORWARD)) {
1087 err = recover_fsync_data(sbi);
ed2e621a 1088 if (err) {
6437d1b0
JK
1089 f2fs_msg(sb, KERN_ERR,
1090 "Cannot recover all fsync data errno=%ld", err);
ed2e621a
JK
1091 goto free_kobj;
1092 }
6437d1b0 1093 }
b59d0bae 1094
6437d1b0
JK
1095 /*
1096 * If filesystem is not mounted as read-only then
1097 * do start the gc_thread.
1098 */
6b2920a5 1099 if (!f2fs_readonly(sb)) {
6437d1b0
JK
1100 /* After POR, we can run background GC thread.*/
1101 err = start_gc_thread(sbi);
1102 if (err)
1103 goto free_kobj;
1104 }
aff063e2 1105 return 0;
6437d1b0
JK
1106
1107free_kobj:
1108 kobject_del(&sbi->s_kobj);
1109free_proc:
1d15bd20
CY
1110 if (sbi->s_proc) {
1111 remove_proc_entry("segment_info", sbi->s_proc);
1112 remove_proc_entry(sb->s_id, f2fs_proc_root);
1113 }
1114 f2fs_destroy_stats(sbi);
aff063e2
JK
1115free_root_inode:
1116 dput(sb->s_root);
1117 sb->s_root = NULL;
1118free_node_inode:
1119 iput(sbi->node_inode);
1120free_nm:
1121 destroy_node_manager(sbi);
1122free_sm:
1123 destroy_segment_manager(sbi);
1124free_cp:
1125 kfree(sbi->ckpt);
1126free_meta_inode:
1127 make_bad_inode(sbi->meta_inode);
1128 iput(sbi->meta_inode);
1129free_sb_buf:
1130 brelse(raw_super_buf);
1131free_sbi:
1132 kfree(sbi);
ed2e621a
JK
1133
1134 /* give only one another chance */
1135 if (retry) {
1136 retry = !retry;
1137 shrink_dcache_sb(sb);
1138 goto try_onemore;
1139 }
aff063e2
JK
1140 return err;
1141}
1142
1143static struct dentry *f2fs_mount(struct file_system_type *fs_type, int flags,
1144 const char *dev_name, void *data)
1145{
1146 return mount_bdev(fs_type, flags, dev_name, data, f2fs_fill_super);
1147}
1148
1149static struct file_system_type f2fs_fs_type = {
1150 .owner = THIS_MODULE,
1151 .name = "f2fs",
1152 .mount = f2fs_mount,
1153 .kill_sb = kill_block_super,
1154 .fs_flags = FS_REQUIRES_DEV,
1155};
7f78e035 1156MODULE_ALIAS_FS("f2fs");
aff063e2 1157
6e6093a8 1158static int __init init_inodecache(void)
aff063e2
JK
1159{
1160 f2fs_inode_cachep = f2fs_kmem_cache_create("f2fs_inode_cache",
e8512d2e 1161 sizeof(struct f2fs_inode_info));
6bacf52f 1162 if (!f2fs_inode_cachep)
aff063e2
JK
1163 return -ENOMEM;
1164 return 0;
1165}
1166
1167static void destroy_inodecache(void)
1168{
1169 /*
1170 * Make sure all delayed rcu free inodes are flushed before we
1171 * destroy cache.
1172 */
1173 rcu_barrier();
1174 kmem_cache_destroy(f2fs_inode_cachep);
1175}
1176
1177static int __init init_f2fs_fs(void)
1178{
1179 int err;
1180
1181 err = init_inodecache();
1182 if (err)
1183 goto fail;
1184 err = create_node_manager_caches();
1185 if (err)
9890ff3f 1186 goto free_inodecache;
7fd9e544 1187 err = create_segment_manager_caches();
aff063e2 1188 if (err)
9890ff3f 1189 goto free_node_manager_caches;
7fd9e544
JK
1190 err = create_gc_caches();
1191 if (err)
1192 goto free_segment_manager_caches;
aff063e2
JK
1193 err = create_checkpoint_caches();
1194 if (err)
9890ff3f 1195 goto free_gc_caches;
b59d0bae 1196 f2fs_kset = kset_create_and_add("f2fs", NULL, fs_kobj);
6e6b978c
WY
1197 if (!f2fs_kset) {
1198 err = -ENOMEM;
9890ff3f 1199 goto free_checkpoint_caches;
6e6b978c 1200 }
4589d25d
NJ
1201 err = register_filesystem(&f2fs_fs_type);
1202 if (err)
9890ff3f 1203 goto free_kset;
4589d25d 1204 f2fs_create_root_stats();
5e176d54 1205 f2fs_proc_root = proc_mkdir("fs/f2fs", NULL);
9890ff3f
ZH
1206 return 0;
1207
1208free_kset:
1209 kset_unregister(f2fs_kset);
1210free_checkpoint_caches:
1211 destroy_checkpoint_caches();
1212free_gc_caches:
1213 destroy_gc_caches();
7fd9e544
JK
1214free_segment_manager_caches:
1215 destroy_segment_manager_caches();
9890ff3f
ZH
1216free_node_manager_caches:
1217 destroy_node_manager_caches();
1218free_inodecache:
1219 destroy_inodecache();
aff063e2
JK
1220fail:
1221 return err;
1222}
1223
1224static void __exit exit_f2fs_fs(void)
1225{
5e176d54 1226 remove_proc_entry("fs/f2fs", NULL);
4589d25d 1227 f2fs_destroy_root_stats();
aff063e2
JK
1228 unregister_filesystem(&f2fs_fs_type);
1229 destroy_checkpoint_caches();
1230 destroy_gc_caches();
5dcd8a71 1231 destroy_segment_manager_caches();
aff063e2
JK
1232 destroy_node_manager_caches();
1233 destroy_inodecache();
b59d0bae 1234 kset_unregister(f2fs_kset);
aff063e2
JK
1235}
1236
1237module_init(init_f2fs_fs)
1238module_exit(exit_f2fs_fs)
1239
1240MODULE_AUTHOR("Samsung Electronics's Praesto Team");
1241MODULE_DESCRIPTION("Flash Friendly File System");
1242MODULE_LICENSE("GPL");