blob: 3ac305da7cee0f7d22667a4675295171c0a78b96 [file] [log] [blame]
Jaegeuk Kim0a8165d2012-11-29 13:28:09 +09001/*
Jaegeuk Kimaff063e2012-11-02 17:07:47 +09002 * fs/f2fs/super.c
3 *
4 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
5 * http://www.samsung.com/
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11#include <linux/module.h>
12#include <linux/init.h>
13#include <linux/fs.h>
14#include <linux/statfs.h>
Jaegeuk Kimaff063e2012-11-02 17:07:47 +090015#include <linux/buffer_head.h>
16#include <linux/backing-dev.h>
17#include <linux/kthread.h>
18#include <linux/parser.h>
19#include <linux/mount.h>
20#include <linux/seq_file.h>
21#include <linux/random.h>
22#include <linux/exportfs.h>
Namjae Jeond3ee4562013-03-17 17:26:14 +090023#include <linux/blkdev.h>
Jaegeuk Kimaff063e2012-11-02 17:07:47 +090024#include <linux/f2fs_fs.h>
25
26#include "f2fs.h"
27#include "node.h"
Jaegeuk Kim5ec4e492013-03-31 13:26:03 +090028#include "segment.h"
Jaegeuk Kimaff063e2012-11-02 17:07:47 +090029#include "xattr.h"
30
Namjae Jeona2a4a7e2013-04-20 01:28:40 +090031#define CREATE_TRACE_POINTS
32#include <trace/events/f2fs.h>
33
Jaegeuk Kimaff063e2012-11-02 17:07:47 +090034static struct kmem_cache *f2fs_inode_cachep;
35
36enum {
37 Opt_gc_background_off,
38 Opt_disable_roll_forward,
39 Opt_discard,
40 Opt_noheap,
41 Opt_nouser_xattr,
42 Opt_noacl,
43 Opt_active_logs,
44 Opt_disable_ext_identify,
45 Opt_err,
46};
47
48static match_table_t f2fs_tokens = {
49 {Opt_gc_background_off, "background_gc_off"},
50 {Opt_disable_roll_forward, "disable_roll_forward"},
51 {Opt_discard, "discard"},
52 {Opt_noheap, "no_heap"},
53 {Opt_nouser_xattr, "nouser_xattr"},
54 {Opt_noacl, "noacl"},
55 {Opt_active_logs, "active_logs=%u"},
56 {Opt_disable_ext_identify, "disable_ext_identify"},
57 {Opt_err, NULL},
58};
59
Namjae Jeona07ef782012-12-30 14:52:05 +090060void f2fs_msg(struct super_block *sb, const char *level, const char *fmt, ...)
61{
62 struct va_format vaf;
63 va_list args;
64
65 va_start(args, fmt);
66 vaf.fmt = fmt;
67 vaf.va = &args;
68 printk("%sF2FS-fs (%s): %pV\n", level, sb->s_id, &vaf);
69 va_end(args);
70}
71
Jaegeuk Kimaff063e2012-11-02 17:07:47 +090072static void init_once(void *foo)
73{
74 struct f2fs_inode_info *fi = (struct f2fs_inode_info *) foo;
75
Jaegeuk Kimaff063e2012-11-02 17:07:47 +090076 inode_init_once(&fi->vfs_inode);
77}
78
79static struct inode *f2fs_alloc_inode(struct super_block *sb)
80{
81 struct f2fs_inode_info *fi;
82
83 fi = kmem_cache_alloc(f2fs_inode_cachep, GFP_NOFS | __GFP_ZERO);
84 if (!fi)
85 return NULL;
86
87 init_once((void *) fi);
88
Masanari Iida434720f2013-03-19 08:03:35 +090089 /* Initialize f2fs-specific inode info */
Jaegeuk Kimaff063e2012-11-02 17:07:47 +090090 fi->vfs_inode.i_version = 1;
91 atomic_set(&fi->dirty_dents, 0);
92 fi->i_current_depth = 1;
93 fi->i_advise = 0;
94 rwlock_init(&fi->ext.ext_lock);
95
96 set_inode_flag(fi, FI_NEW_INODE);
97
98 return &fi->vfs_inode;
99}
100
Jaegeuk Kim531ad7d2013-04-30 11:33:27 +0900101static int f2fs_drop_inode(struct inode *inode)
102{
103 /*
104 * This is to avoid a deadlock condition like below.
105 * writeback_single_inode(inode)
106 * - f2fs_write_data_page
107 * - f2fs_gc -> iput -> evict
108 * - inode_wait_for_writeback(inode)
109 */
110 if (!inode_unhashed(inode) && inode->i_state & I_SYNC)
111 return 0;
112 return generic_drop_inode(inode);
113}
114
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900115static void f2fs_i_callback(struct rcu_head *head)
116{
117 struct inode *inode = container_of(head, struct inode, i_rcu);
118 kmem_cache_free(f2fs_inode_cachep, F2FS_I(inode));
119}
120
Jaegeuk Kim25ca9232012-11-28 16:12:41 +0900121static void f2fs_destroy_inode(struct inode *inode)
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900122{
123 call_rcu(&inode->i_rcu, f2fs_i_callback);
124}
125
126static void f2fs_put_super(struct super_block *sb)
127{
128 struct f2fs_sb_info *sbi = F2FS_SB(sb);
129
130 f2fs_destroy_stats(sbi);
131 stop_gc_thread(sbi);
132
Jaegeuk Kim43727522013-02-04 15:11:17 +0900133 write_checkpoint(sbi, true);
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900134
135 iput(sbi->node_inode);
136 iput(sbi->meta_inode);
137
138 /* destroy f2fs internal modules */
139 destroy_node_manager(sbi);
140 destroy_segment_manager(sbi);
141
142 kfree(sbi->ckpt);
143
144 sb->s_fs_info = NULL;
145 brelse(sbi->raw_super_buf);
146 kfree(sbi);
147}
148
149int f2fs_sync_fs(struct super_block *sb, int sync)
150{
151 struct f2fs_sb_info *sbi = F2FS_SB(sb);
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900152
Namjae Jeona2a4a7e2013-04-20 01:28:40 +0900153 trace_f2fs_sync_fs(sb, sync);
154
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900155 if (!sbi->s_dirty && !get_pages(sbi, F2FS_DIRTY_NODES))
156 return 0;
157
Jaegeuk Kimb7473752013-04-01 08:32:21 +0900158 if (sync) {
159 mutex_lock(&sbi->gc_mutex);
Jaegeuk Kim43727522013-02-04 15:11:17 +0900160 write_checkpoint(sbi, false);
Jaegeuk Kimb7473752013-04-01 08:32:21 +0900161 mutex_unlock(&sbi->gc_mutex);
162 } else {
Jaegeuk Kim7d82db82013-01-11 13:10:49 +0900163 f2fs_balance_fs(sbi);
Jaegeuk Kimb7473752013-04-01 08:32:21 +0900164 }
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900165
Namjae Jeon64c576f2012-12-22 12:10:27 +0900166 return 0;
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900167}
168
Changman Leed6212a52013-01-29 18:30:07 +0900169static int f2fs_freeze(struct super_block *sb)
170{
171 int err;
172
Jaegeuk Kim77888c12013-05-20 20:28:47 +0900173 if (f2fs_readonly(sb))
Changman Leed6212a52013-01-29 18:30:07 +0900174 return 0;
175
176 err = f2fs_sync_fs(sb, 1);
177 return err;
178}
179
180static int f2fs_unfreeze(struct super_block *sb)
181{
182 return 0;
183}
184
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900185static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf)
186{
187 struct super_block *sb = dentry->d_sb;
188 struct f2fs_sb_info *sbi = F2FS_SB(sb);
189 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
190 block_t total_count, user_block_count, start_count, ovp_count;
191
192 total_count = le64_to_cpu(sbi->raw_super->block_count);
193 user_block_count = sbi->user_block_count;
194 start_count = le32_to_cpu(sbi->raw_super->segment0_blkaddr);
195 ovp_count = SM_I(sbi)->ovp_segments << sbi->log_blocks_per_seg;
196 buf->f_type = F2FS_SUPER_MAGIC;
197 buf->f_bsize = sbi->blocksize;
198
199 buf->f_blocks = total_count - start_count;
200 buf->f_bfree = buf->f_blocks - valid_user_blocks(sbi) - ovp_count;
201 buf->f_bavail = user_block_count - valid_user_blocks(sbi);
202
Jaegeuk Kim1362b5e2012-12-12 19:45:49 +0900203 buf->f_files = sbi->total_node_count;
204 buf->f_ffree = sbi->total_node_count - valid_inode_count(sbi);
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900205
Jaegeuk Kim5a20d332013-03-03 13:58:05 +0900206 buf->f_namelen = F2FS_NAME_LEN;
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900207 buf->f_fsid.val[0] = (u32)id;
208 buf->f_fsid.val[1] = (u32)(id >> 32);
209
210 return 0;
211}
212
213static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
214{
215 struct f2fs_sb_info *sbi = F2FS_SB(root->d_sb);
216
217 if (test_opt(sbi, BG_GC))
218 seq_puts(seq, ",background_gc_on");
219 else
220 seq_puts(seq, ",background_gc_off");
221 if (test_opt(sbi, DISABLE_ROLL_FORWARD))
222 seq_puts(seq, ",disable_roll_forward");
223 if (test_opt(sbi, DISCARD))
224 seq_puts(seq, ",discard");
225 if (test_opt(sbi, NOHEAP))
226 seq_puts(seq, ",no_heap_alloc");
227#ifdef CONFIG_F2FS_FS_XATTR
228 if (test_opt(sbi, XATTR_USER))
229 seq_puts(seq, ",user_xattr");
230 else
231 seq_puts(seq, ",nouser_xattr");
232#endif
233#ifdef CONFIG_F2FS_FS_POSIX_ACL
234 if (test_opt(sbi, POSIX_ACL))
235 seq_puts(seq, ",acl");
236 else
237 seq_puts(seq, ",noacl");
238#endif
239 if (test_opt(sbi, DISABLE_EXT_IDENTIFY))
Alejandro Martinez Ruizaa435072013-01-25 19:08:59 +0100240 seq_puts(seq, ",disable_ext_identify");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900241
242 seq_printf(seq, ",active_logs=%u", sbi->active_logs);
243
244 return 0;
245}
246
247static struct super_operations f2fs_sops = {
248 .alloc_inode = f2fs_alloc_inode,
Jaegeuk Kim531ad7d2013-04-30 11:33:27 +0900249 .drop_inode = f2fs_drop_inode,
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900250 .destroy_inode = f2fs_destroy_inode,
251 .write_inode = f2fs_write_inode,
252 .show_options = f2fs_show_options,
253 .evict_inode = f2fs_evict_inode,
254 .put_super = f2fs_put_super,
255 .sync_fs = f2fs_sync_fs,
Changman Leed6212a52013-01-29 18:30:07 +0900256 .freeze_fs = f2fs_freeze,
257 .unfreeze_fs = f2fs_unfreeze,
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900258 .statfs = f2fs_statfs,
259};
260
261static struct inode *f2fs_nfs_get_inode(struct super_block *sb,
262 u64 ino, u32 generation)
263{
264 struct f2fs_sb_info *sbi = F2FS_SB(sb);
265 struct inode *inode;
266
267 if (ino < F2FS_ROOT_INO(sbi))
268 return ERR_PTR(-ESTALE);
269
270 /*
271 * f2fs_iget isn't quite right if the inode is currently unallocated!
272 * However f2fs_iget currently does appropriate checks to handle stale
273 * inodes so everything is OK.
274 */
275 inode = f2fs_iget(sb, ino);
276 if (IS_ERR(inode))
277 return ERR_CAST(inode);
278 if (generation && inode->i_generation != generation) {
279 /* we didn't find the right inode.. */
280 iput(inode);
281 return ERR_PTR(-ESTALE);
282 }
283 return inode;
284}
285
286static struct dentry *f2fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
287 int fh_len, int fh_type)
288{
289 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
290 f2fs_nfs_get_inode);
291}
292
293static struct dentry *f2fs_fh_to_parent(struct super_block *sb, struct fid *fid,
294 int fh_len, int fh_type)
295{
296 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
297 f2fs_nfs_get_inode);
298}
299
300static const struct export_operations f2fs_export_ops = {
301 .fh_to_dentry = f2fs_fh_to_dentry,
302 .fh_to_parent = f2fs_fh_to_parent,
303 .get_parent = f2fs_get_parent,
304};
305
Namjae Jeona07ef782012-12-30 14:52:05 +0900306static int parse_options(struct super_block *sb, struct f2fs_sb_info *sbi,
307 char *options)
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900308{
309 substring_t args[MAX_OPT_ARGS];
310 char *p;
311 int arg = 0;
312
313 if (!options)
314 return 0;
315
316 while ((p = strsep(&options, ",")) != NULL) {
317 int token;
318 if (!*p)
319 continue;
320 /*
321 * Initialize args struct so we know whether arg was
322 * found; some options take optional arguments.
323 */
324 args[0].to = args[0].from = NULL;
325 token = match_token(p, f2fs_tokens, args);
326
327 switch (token) {
328 case Opt_gc_background_off:
329 clear_opt(sbi, BG_GC);
330 break;
331 case Opt_disable_roll_forward:
332 set_opt(sbi, DISABLE_ROLL_FORWARD);
333 break;
334 case Opt_discard:
335 set_opt(sbi, DISCARD);
336 break;
337 case Opt_noheap:
338 set_opt(sbi, NOHEAP);
339 break;
340#ifdef CONFIG_F2FS_FS_XATTR
341 case Opt_nouser_xattr:
342 clear_opt(sbi, XATTR_USER);
343 break;
344#else
345 case Opt_nouser_xattr:
Namjae Jeona07ef782012-12-30 14:52:05 +0900346 f2fs_msg(sb, KERN_INFO,
347 "nouser_xattr options not supported");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900348 break;
349#endif
350#ifdef CONFIG_F2FS_FS_POSIX_ACL
351 case Opt_noacl:
352 clear_opt(sbi, POSIX_ACL);
353 break;
354#else
355 case Opt_noacl:
Namjae Jeona07ef782012-12-30 14:52:05 +0900356 f2fs_msg(sb, KERN_INFO, "noacl options not supported");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900357 break;
358#endif
359 case Opt_active_logs:
360 if (args->from && match_int(args, &arg))
361 return -EINVAL;
Jaegeuk Kim12a67142012-12-21 11:47:05 +0900362 if (arg != 2 && arg != 4 && arg != NR_CURSEG_TYPE)
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900363 return -EINVAL;
364 sbi->active_logs = arg;
365 break;
366 case Opt_disable_ext_identify:
367 set_opt(sbi, DISABLE_EXT_IDENTIFY);
368 break;
369 default:
Namjae Jeona07ef782012-12-30 14:52:05 +0900370 f2fs_msg(sb, KERN_ERR,
371 "Unrecognized mount option \"%s\" or missing value",
372 p);
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900373 return -EINVAL;
374 }
375 }
376 return 0;
377}
378
379static loff_t max_file_size(unsigned bits)
380{
381 loff_t result = ADDRS_PER_INODE;
382 loff_t leaf_count = ADDRS_PER_BLOCK;
383
384 /* two direct node blocks */
385 result += (leaf_count * 2);
386
387 /* two indirect node blocks */
388 leaf_count *= NIDS_PER_BLOCK;
389 result += (leaf_count * 2);
390
391 /* one double indirect node block */
392 leaf_count *= NIDS_PER_BLOCK;
393 result += leaf_count;
394
395 result <<= bits;
396 return result;
397}
398
Namjae Jeona07ef782012-12-30 14:52:05 +0900399static int sanity_check_raw_super(struct super_block *sb,
400 struct f2fs_super_block *raw_super)
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900401{
402 unsigned int blocksize;
403
Namjae Jeona07ef782012-12-30 14:52:05 +0900404 if (F2FS_SUPER_MAGIC != le32_to_cpu(raw_super->magic)) {
405 f2fs_msg(sb, KERN_INFO,
406 "Magic Mismatch, valid(0x%x) - read(0x%x)",
407 F2FS_SUPER_MAGIC, le32_to_cpu(raw_super->magic));
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900408 return 1;
Namjae Jeona07ef782012-12-30 14:52:05 +0900409 }
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900410
majianpeng5c9b4692013-02-01 19:07:57 +0800411 /* Currently, support only 4KB page cache size */
412 if (F2FS_BLKSIZE != PAGE_CACHE_SIZE) {
413 f2fs_msg(sb, KERN_INFO,
majianpeng14d7e9d2013-02-01 19:07:03 +0800414 "Invalid page_cache_size (%lu), supports only 4KB\n",
majianpeng5c9b4692013-02-01 19:07:57 +0800415 PAGE_CACHE_SIZE);
416 return 1;
417 }
418
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900419 /* Currently, support only 4KB block size */
420 blocksize = 1 << le32_to_cpu(raw_super->log_blocksize);
majianpeng5c9b4692013-02-01 19:07:57 +0800421 if (blocksize != F2FS_BLKSIZE) {
Namjae Jeona07ef782012-12-30 14:52:05 +0900422 f2fs_msg(sb, KERN_INFO,
423 "Invalid blocksize (%u), supports only 4KB\n",
424 blocksize);
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900425 return 1;
Namjae Jeona07ef782012-12-30 14:52:05 +0900426 }
majianpeng5c9b4692013-02-01 19:07:57 +0800427
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900428 if (le32_to_cpu(raw_super->log_sectorsize) !=
Namjae Jeona07ef782012-12-30 14:52:05 +0900429 F2FS_LOG_SECTOR_SIZE) {
430 f2fs_msg(sb, KERN_INFO, "Invalid log sectorsize");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900431 return 1;
Namjae Jeona07ef782012-12-30 14:52:05 +0900432 }
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900433 if (le32_to_cpu(raw_super->log_sectors_per_block) !=
Namjae Jeona07ef782012-12-30 14:52:05 +0900434 F2FS_LOG_SECTORS_PER_BLOCK) {
435 f2fs_msg(sb, KERN_INFO, "Invalid log sectors per block");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900436 return 1;
Namjae Jeona07ef782012-12-30 14:52:05 +0900437 }
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900438 return 0;
439}
440
Jaegeuk Kim577e3492013-01-24 19:56:11 +0900441static int sanity_check_ckpt(struct f2fs_sb_info *sbi)
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900442{
443 unsigned int total, fsmeta;
Jaegeuk Kim577e3492013-01-24 19:56:11 +0900444 struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
445 struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900446
447 total = le32_to_cpu(raw_super->segment_count);
448 fsmeta = le32_to_cpu(raw_super->segment_count_ckpt);
449 fsmeta += le32_to_cpu(raw_super->segment_count_sit);
450 fsmeta += le32_to_cpu(raw_super->segment_count_nat);
451 fsmeta += le32_to_cpu(ckpt->rsvd_segment_count);
452 fsmeta += le32_to_cpu(raw_super->segment_count_ssa);
453
454 if (fsmeta >= total)
455 return 1;
Jaegeuk Kim577e3492013-01-24 19:56:11 +0900456
457 if (is_set_ckpt_flags(ckpt, CP_ERROR_FLAG)) {
458 f2fs_msg(sbi->sb, KERN_ERR, "A bug case: need to run fsck");
459 return 1;
460 }
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900461 return 0;
462}
463
464static void init_sb_info(struct f2fs_sb_info *sbi)
465{
466 struct f2fs_super_block *raw_super = sbi->raw_super;
467 int i;
468
469 sbi->log_sectors_per_block =
470 le32_to_cpu(raw_super->log_sectors_per_block);
471 sbi->log_blocksize = le32_to_cpu(raw_super->log_blocksize);
472 sbi->blocksize = 1 << sbi->log_blocksize;
473 sbi->log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
474 sbi->blocks_per_seg = 1 << sbi->log_blocks_per_seg;
475 sbi->segs_per_sec = le32_to_cpu(raw_super->segs_per_sec);
476 sbi->secs_per_zone = le32_to_cpu(raw_super->secs_per_zone);
477 sbi->total_sections = le32_to_cpu(raw_super->section_count);
478 sbi->total_node_count =
479 (le32_to_cpu(raw_super->segment_count_nat) / 2)
480 * sbi->blocks_per_seg * NAT_ENTRY_PER_BLOCK;
481 sbi->root_ino_num = le32_to_cpu(raw_super->root_ino);
482 sbi->node_ino_num = le32_to_cpu(raw_super->node_ino);
483 sbi->meta_ino_num = le32_to_cpu(raw_super->meta_ino);
Jaegeuk Kim5ec4e492013-03-31 13:26:03 +0900484 sbi->cur_victim_sec = NULL_SECNO;
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900485
486 for (i = 0; i < NR_COUNT_TYPE; i++)
487 atomic_set(&sbi->nr_pages[i], 0);
488}
489
majianpeng14d7e9d2013-02-01 19:07:03 +0800490static int validate_superblock(struct super_block *sb,
491 struct f2fs_super_block **raw_super,
492 struct buffer_head **raw_super_buf, sector_t block)
493{
494 const char *super = (block == 0 ? "first" : "second");
495
496 /* read f2fs raw super block */
497 *raw_super_buf = sb_bread(sb, block);
498 if (!*raw_super_buf) {
499 f2fs_msg(sb, KERN_ERR, "unable to read %s superblock",
500 super);
Namjae Jeonc0d39e62013-03-17 17:26:53 +0900501 return -EIO;
majianpeng14d7e9d2013-02-01 19:07:03 +0800502 }
503
504 *raw_super = (struct f2fs_super_block *)
505 ((char *)(*raw_super_buf)->b_data + F2FS_SUPER_OFFSET);
506
507 /* sanity checking of raw super */
508 if (!sanity_check_raw_super(sb, *raw_super))
509 return 0;
510
511 f2fs_msg(sb, KERN_ERR, "Can't find a valid F2FS filesystem "
512 "in %s superblock", super);
Namjae Jeonc0d39e62013-03-17 17:26:53 +0900513 return -EINVAL;
majianpeng14d7e9d2013-02-01 19:07:03 +0800514}
515
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900516static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
517{
518 struct f2fs_sb_info *sbi;
519 struct f2fs_super_block *raw_super;
520 struct buffer_head *raw_super_buf;
521 struct inode *root;
522 long err = -EINVAL;
523 int i;
524
525 /* allocate memory for f2fs-specific super block info */
526 sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL);
527 if (!sbi)
528 return -ENOMEM;
529
Namjae Jeonff9234a2013-01-12 14:41:13 +0900530 /* set a block size */
Namjae Jeona07ef782012-12-30 14:52:05 +0900531 if (!sb_set_blocksize(sb, F2FS_BLKSIZE)) {
532 f2fs_msg(sb, KERN_ERR, "unable to set blocksize");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900533 goto free_sbi;
Namjae Jeona07ef782012-12-30 14:52:05 +0900534 }
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900535
Namjae Jeonc0d39e62013-03-17 17:26:53 +0900536 err = validate_superblock(sb, &raw_super, &raw_super_buf, 0);
537 if (err) {
majianpeng14d7e9d2013-02-01 19:07:03 +0800538 brelse(raw_super_buf);
Namjae Jeonc0d39e62013-03-17 17:26:53 +0900539 /* check secondary superblock when primary failed */
540 err = validate_superblock(sb, &raw_super, &raw_super_buf, 1);
541 if (err)
majianpeng14d7e9d2013-02-01 19:07:03 +0800542 goto free_sb_buf;
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900543 }
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900544 /* init some FS parameters */
545 sbi->active_logs = NR_CURSEG_TYPE;
546
547 set_opt(sbi, BG_GC);
548
549#ifdef CONFIG_F2FS_FS_XATTR
550 set_opt(sbi, XATTR_USER);
551#endif
552#ifdef CONFIG_F2FS_FS_POSIX_ACL
553 set_opt(sbi, POSIX_ACL);
554#endif
555 /* parse mount options */
Wei Yongjun66348b72013-04-12 10:23:18 +0800556 err = parse_options(sb, sbi, (char *)data);
557 if (err)
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900558 goto free_sb_buf;
559
Jaegeuk Kim25ca9232012-11-28 16:12:41 +0900560 sb->s_maxbytes = max_file_size(le32_to_cpu(raw_super->log_blocksize));
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900561 sb->s_max_links = F2FS_LINK_MAX;
562 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
563
564 sb->s_op = &f2fs_sops;
565 sb->s_xattr = f2fs_xattr_handlers;
566 sb->s_export_op = &f2fs_export_ops;
567 sb->s_magic = F2FS_SUPER_MAGIC;
568 sb->s_fs_info = sbi;
569 sb->s_time_gran = 1;
570 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
571 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
572 memcpy(sb->s_uuid, raw_super->uuid, sizeof(raw_super->uuid));
573
574 /* init f2fs-specific super block info */
575 sbi->sb = sb;
576 sbi->raw_super = raw_super;
577 sbi->raw_super_buf = raw_super_buf;
578 mutex_init(&sbi->gc_mutex);
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900579 mutex_init(&sbi->writepages);
580 mutex_init(&sbi->cp_mutex);
Jaegeuk Kim39936832012-11-22 16:21:29 +0900581 for (i = 0; i < NR_GLOBAL_LOCKS; i++)
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900582 mutex_init(&sbi->fs_lock[i]);
Jaegeuk Kim39936832012-11-22 16:21:29 +0900583 mutex_init(&sbi->node_write);
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900584 sbi->por_doing = 0;
585 spin_lock_init(&sbi->stat_lock);
586 init_rwsem(&sbi->bio_sem);
587 init_sb_info(sbi);
588
589 /* get an inode for meta space */
590 sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi));
591 if (IS_ERR(sbi->meta_inode)) {
Namjae Jeona07ef782012-12-30 14:52:05 +0900592 f2fs_msg(sb, KERN_ERR, "Failed to read F2FS meta data inode");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900593 err = PTR_ERR(sbi->meta_inode);
594 goto free_sb_buf;
595 }
596
597 err = get_valid_checkpoint(sbi);
Namjae Jeona07ef782012-12-30 14:52:05 +0900598 if (err) {
599 f2fs_msg(sb, KERN_ERR, "Failed to get valid F2FS checkpoint");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900600 goto free_meta_inode;
Namjae Jeona07ef782012-12-30 14:52:05 +0900601 }
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900602
603 /* sanity checking of checkpoint */
604 err = -EINVAL;
Jaegeuk Kim577e3492013-01-24 19:56:11 +0900605 if (sanity_check_ckpt(sbi)) {
Namjae Jeona07ef782012-12-30 14:52:05 +0900606 f2fs_msg(sb, KERN_ERR, "Invalid F2FS checkpoint");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900607 goto free_cp;
Namjae Jeona07ef782012-12-30 14:52:05 +0900608 }
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900609
610 sbi->total_valid_node_count =
611 le32_to_cpu(sbi->ckpt->valid_node_count);
612 sbi->total_valid_inode_count =
613 le32_to_cpu(sbi->ckpt->valid_inode_count);
614 sbi->user_block_count = le64_to_cpu(sbi->ckpt->user_block_count);
615 sbi->total_valid_block_count =
616 le64_to_cpu(sbi->ckpt->valid_block_count);
617 sbi->last_valid_block_count = sbi->total_valid_block_count;
618 sbi->alloc_valid_block_count = 0;
619 INIT_LIST_HEAD(&sbi->dir_inode_list);
620 spin_lock_init(&sbi->dir_inode_lock);
621
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900622 init_orphan_info(sbi);
623
624 /* setup f2fs internal modules */
625 err = build_segment_manager(sbi);
Namjae Jeona07ef782012-12-30 14:52:05 +0900626 if (err) {
627 f2fs_msg(sb, KERN_ERR,
628 "Failed to initialize F2FS segment manager");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900629 goto free_sm;
Namjae Jeona07ef782012-12-30 14:52:05 +0900630 }
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900631 err = build_node_manager(sbi);
Namjae Jeona07ef782012-12-30 14:52:05 +0900632 if (err) {
633 f2fs_msg(sb, KERN_ERR,
634 "Failed to initialize F2FS node manager");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900635 goto free_nm;
Namjae Jeona07ef782012-12-30 14:52:05 +0900636 }
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900637
638 build_gc_manager(sbi);
639
640 /* get an inode for node space */
641 sbi->node_inode = f2fs_iget(sb, F2FS_NODE_INO(sbi));
642 if (IS_ERR(sbi->node_inode)) {
Namjae Jeona07ef782012-12-30 14:52:05 +0900643 f2fs_msg(sb, KERN_ERR, "Failed to read node inode");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900644 err = PTR_ERR(sbi->node_inode);
645 goto free_nm;
646 }
647
648 /* if there are nt orphan nodes free them */
649 err = -EINVAL;
Jaegeuk Kim30f0c752012-12-19 16:09:19 +0900650 if (recover_orphan_inodes(sbi))
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900651 goto free_node_inode;
652
653 /* read root inode and dentry */
654 root = f2fs_iget(sb, F2FS_ROOT_INO(sbi));
655 if (IS_ERR(root)) {
Namjae Jeona07ef782012-12-30 14:52:05 +0900656 f2fs_msg(sb, KERN_ERR, "Failed to read root inode");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900657 err = PTR_ERR(root);
658 goto free_node_inode;
659 }
660 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size)
661 goto free_root_inode;
662
663 sb->s_root = d_make_root(root); /* allocate root dentry */
664 if (!sb->s_root) {
665 err = -ENOMEM;
666 goto free_root_inode;
667 }
668
669 /* recover fsynced data */
Jaegeuk Kim6ead1142013-03-20 19:01:06 +0900670 if (!test_opt(sbi, DISABLE_ROLL_FORWARD)) {
671 err = recover_fsync_data(sbi);
Chris Friesbde582b2013-05-02 16:07:34 -0500672 if (err)
673 f2fs_msg(sb, KERN_ERR,
674 "Cannot recover all fsync data errno=%ld", err);
Jaegeuk Kim6ead1142013-03-20 19:01:06 +0900675 }
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900676
677 /* After POR, we can run background GC thread */
678 err = start_gc_thread(sbi);
679 if (err)
680 goto fail;
681
682 err = f2fs_build_stats(sbi);
683 if (err)
684 goto fail;
685
Namjae Jeond3ee4562013-03-17 17:26:14 +0900686 if (test_opt(sbi, DISCARD)) {
687 struct request_queue *q = bdev_get_queue(sb->s_bdev);
688 if (!blk_queue_discard(q))
689 f2fs_msg(sb, KERN_WARNING,
690 "mounting with \"discard\" option, but "
691 "the device does not support discard");
692 }
693
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900694 return 0;
695fail:
696 stop_gc_thread(sbi);
697free_root_inode:
698 dput(sb->s_root);
699 sb->s_root = NULL;
700free_node_inode:
701 iput(sbi->node_inode);
702free_nm:
703 destroy_node_manager(sbi);
704free_sm:
705 destroy_segment_manager(sbi);
706free_cp:
707 kfree(sbi->ckpt);
708free_meta_inode:
709 make_bad_inode(sbi->meta_inode);
710 iput(sbi->meta_inode);
711free_sb_buf:
712 brelse(raw_super_buf);
713free_sbi:
714 kfree(sbi);
715 return err;
716}
717
718static struct dentry *f2fs_mount(struct file_system_type *fs_type, int flags,
719 const char *dev_name, void *data)
720{
721 return mount_bdev(fs_type, flags, dev_name, data, f2fs_fill_super);
722}
723
724static struct file_system_type f2fs_fs_type = {
725 .owner = THIS_MODULE,
726 .name = "f2fs",
727 .mount = f2fs_mount,
728 .kill_sb = kill_block_super,
729 .fs_flags = FS_REQUIRES_DEV,
730};
Eric W. Biederman7f78e032013-03-02 19:39:14 -0800731MODULE_ALIAS_FS("f2fs");
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900732
Namjae Jeon6e6093a2013-01-17 00:08:30 +0900733static int __init init_inodecache(void)
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900734{
735 f2fs_inode_cachep = f2fs_kmem_cache_create("f2fs_inode_cache",
736 sizeof(struct f2fs_inode_info), NULL);
737 if (f2fs_inode_cachep == NULL)
738 return -ENOMEM;
739 return 0;
740}
741
742static void destroy_inodecache(void)
743{
744 /*
745 * Make sure all delayed rcu free inodes are flushed before we
746 * destroy cache.
747 */
748 rcu_barrier();
749 kmem_cache_destroy(f2fs_inode_cachep);
750}
751
752static int __init init_f2fs_fs(void)
753{
754 int err;
755
756 err = init_inodecache();
757 if (err)
758 goto fail;
759 err = create_node_manager_caches();
760 if (err)
761 goto fail;
762 err = create_gc_caches();
763 if (err)
764 goto fail;
765 err = create_checkpoint_caches();
766 if (err)
767 goto fail;
Namjae Jeon4589d252013-01-15 19:58:47 +0900768 err = register_filesystem(&f2fs_fs_type);
769 if (err)
770 goto fail;
771 f2fs_create_root_stats();
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900772fail:
773 return err;
774}
775
776static void __exit exit_f2fs_fs(void)
777{
Namjae Jeon4589d252013-01-15 19:58:47 +0900778 f2fs_destroy_root_stats();
Jaegeuk Kimaff063e2012-11-02 17:07:47 +0900779 unregister_filesystem(&f2fs_fs_type);
780 destroy_checkpoint_caches();
781 destroy_gc_caches();
782 destroy_node_manager_caches();
783 destroy_inodecache();
784}
785
786module_init(init_f2fs_fs)
787module_exit(exit_f2fs_fs)
788
789MODULE_AUTHOR("Samsung Electronics's Praesto Team");
790MODULE_DESCRIPTION("Flash Friendly File System");
791MODULE_LICENSE("GPL");