fs/f2fs/sysfs.c

   1 /*
   2  * f2fs sysfs interface
   3  *
   4  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
   5  *             http://www.samsung.com/
   6  * Copyright (c) 2017 Chao Yu <chao@kernel.org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12 #include <linux/proc_fs.h>
  13 #include <linux/f2fs_fs.h>
  14
  15 #include "f2fs.h"
  16 #include "segment.h"
  17 #include "gc.h"
  18
  19 static struct proc_dir_entry *f2fs_proc_root;
  20 static struct kset *f2fs_kset;
  21
  22 /* Sysfs support for f2fs */
  23 enum {
  24         GC_THREAD,      /* struct f2fs_gc_thread */
  25         SM_INFO,        /* struct f2fs_sm_info */
  26         DCC_INFO,       /* struct discard_cmd_control */
  27         NM_INFO,        /* struct f2fs_nm_info */
  28         F2FS_SBI,       /* struct f2fs_sb_info */
  29 #ifdef CONFIG_F2FS_FAULT_INJECTION
  30         FAULT_INFO_RATE,        /* struct f2fs_fault_info */
  31         FAULT_INFO_TYPE,        /* struct f2fs_fault_info */
  32 #endif
  33         RESERVED_BLOCKS,
  34 };
  35
  36 struct f2fs_attr {
  37         struct attribute attr;
  38         ssize_t (*show)(struct f2fs_attr *, struct f2fs_sb_info *, char *);
  39         ssize_t (*store)(struct f2fs_attr *, struct f2fs_sb_info *,
  40                          const char *, size_t);
  41         int struct_type;
  42         int offset;
  43 };
  44
  45 static unsigned char *__struct_ptr(struct f2fs_sb_info *sbi, int struct_type)
  46 {
  47         if (struct_type == GC_THREAD)
  48                 return (unsigned char *)sbi->gc_thread;
  49         else if (struct_type == SM_INFO)
  50                 return (unsigned char *)SM_I(sbi);
  51         else if (struct_type == DCC_INFO)
  52                 return (unsigned char *)SM_I(sbi)->dcc_info;
  53         else if (struct_type == NM_INFO)
  54                 return (unsigned char *)NM_I(sbi);
  55         else if (struct_type == F2FS_SBI || struct_type == RESERVED_BLOCKS)
  56                 return (unsigned char *)sbi;
  57 #ifdef CONFIG_F2FS_FAULT_INJECTION
  58         else if (struct_type == FAULT_INFO_RATE ||
  59                                         struct_type == FAULT_INFO_TYPE)
  60                 return (unsigned char *)&sbi->fault_info;
  61 #endif
  62         return NULL;
  63 }
  64
  65 static ssize_t lifetime_write_kbytes_show(struct f2fs_attr *a,
  66                 struct f2fs_sb_info *sbi, char *buf)
  67 {
  68         struct super_block *sb = sbi->sb;
  69
  70         if (!sb->s_bdev->bd_part)
  71                 return snprintf(buf, PAGE_SIZE, "0\n");
  72
  73         return snprintf(buf, PAGE_SIZE, "%llu\n",
  74                 (unsigned long long)(sbi->kbytes_written +
  75                         BD_PART_WRITTEN(sbi)));
  76 }
  77
  78 static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
  79                         struct f2fs_sb_info *sbi, char *buf)
  80 {
  81         unsigned char *ptr = NULL;
  82         unsigned int *ui;
  83
  84         ptr = __struct_ptr(sbi, a->struct_type);
  85         if (!ptr)
  86                 return -EINVAL;
  87
  88         ui = (unsigned int *)(ptr + a->offset);
  89
  90         return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
  91 }
  92
  93 static ssize_t f2fs_sbi_store(struct f2fs_attr *a,
  94                         struct f2fs_sb_info *sbi,
  95                         const char *buf, size_t count)
  96 {
  97         unsigned char *ptr;
  98         unsigned long t;
  99         unsigned int *ui;
 100         ssize_t ret;
 101
 102         ptr = __struct_ptr(sbi, a->struct_type);
 103         if (!ptr)
 104                 return -EINVAL;
 105
 106         ui = (unsigned int *)(ptr + a->offset);
 107
 108         ret = kstrtoul(skip_spaces(buf), 0, &t);
 109         if (ret < 0)
 110                 return ret;
 111 #ifdef CONFIG_F2FS_FAULT_INJECTION
 112         if (a->struct_type == FAULT_INFO_TYPE && t >= (1 << FAULT_MAX))
 113                 return -EINVAL;
 114 #endif
 115         if (a->struct_type == RESERVED_BLOCKS) {
 116                 spin_lock(&sbi->stat_lock);
 117                 if ((unsigned long)sbi->total_valid_block_count + t >
 118                                 (unsigned long)sbi->user_block_count) {
 119                         spin_unlock(&sbi->stat_lock);
 120                         return -EINVAL;
 121                 }
 122                 *ui = t;
 123                 spin_unlock(&sbi->stat_lock);
 124                 return count;
 125         }
 126         *ui = t;
 127         return count;
 128 }
 129
 130 static ssize_t f2fs_attr_show(struct kobject *kobj,
 131                                 struct attribute *attr, char *buf)
 132 {
 133         struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
 134                                                                 s_kobj);
 135         struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
 136
 137         return a->show ? a->show(a, sbi, buf) : 0;
 138 }
 139
 140 static ssize_t f2fs_attr_store(struct kobject *kobj, struct attribute *attr,
 141                                                 const char *buf, size_t len)
 142 {
 143         struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
 144                                                                         s_kobj);
 145         struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
 146
 147         return a->store ? a->store(a, sbi, buf, len) : 0;
 148 }
 149
 150 static void f2fs_sb_release(struct kobject *kobj)
 151 {
 152         struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
 153                                                                 s_kobj);
 154         complete(&sbi->s_kobj_unregister);
 155 }
 156
 157 #define F2FS_ATTR_OFFSET(_struct_type, _name, _mode, _show, _store, _offset) \
 158 static struct f2fs_attr f2fs_attr_##_name = {                   \
 159         .attr = {.name = __stringify(_name), .mode = _mode },   \
 160         .show   = _show,                                        \
 161         .store  = _store,                                       \
 162         .struct_type = _struct_type,                            \
 163         .offset = _offset                                       \
 164 }
 165
 166 #define F2FS_RW_ATTR(struct_type, struct_name, name, elname)    \
 167         F2FS_ATTR_OFFSET(struct_type, name, 0644,               \
 168                 f2fs_sbi_show, f2fs_sbi_store,                  \
 169                 offsetof(struct struct_name, elname))
 170
 171 #define F2FS_GENERAL_RO_ATTR(name) \
 172 static struct f2fs_attr f2fs_attr_##name = __ATTR(name, 0444, name##_show, NULL)
 173
 174 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_min_sleep_time, min_sleep_time);
 175 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_max_sleep_time, max_sleep_time);
 176 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_no_gc_sleep_time, no_gc_sleep_time);
 177 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_idle, gc_idle);
 178 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, reclaim_segments, rec_prefree_segments);
 179 F2FS_RW_ATTR(DCC_INFO, discard_cmd_control, max_small_discards, max_discards);
 180 F2FS_RW_ATTR(RESERVED_BLOCKS, f2fs_sb_info, reserved_blocks, reserved_blocks);
 181 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, batched_trim_sections, trim_sections);
 182 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, ipu_policy, ipu_policy);
 183 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ipu_util, min_ipu_util);
 184 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_fsync_blocks, min_fsync_blocks);
 185 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_hot_blocks, min_hot_blocks);
 186 F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ram_thresh, ram_thresh);
 187 F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ra_nid_pages, ra_nid_pages);
 188 F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, dirty_nats_ratio, dirty_nats_ratio);
 189 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, max_victim_search, max_victim_search);
 190 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, dir_level, dir_level);
 191 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, cp_interval, interval_time[CP_TIME]);
 192 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, idle_interval, interval_time[REQ_TIME]);
 193 #ifdef CONFIG_F2FS_FAULT_INJECTION
 194 F2FS_RW_ATTR(FAULT_INFO_RATE, f2fs_fault_info, inject_rate, inject_rate);
 195 F2FS_RW_ATTR(FAULT_INFO_TYPE, f2fs_fault_info, inject_type, inject_type);
 196 #endif
 197 F2FS_GENERAL_RO_ATTR(lifetime_write_kbytes);
 198
 199 #define ATTR_LIST(name) (&f2fs_attr_##name.attr)
 200 static struct attribute *f2fs_attrs[] = {
 201         ATTR_LIST(gc_min_sleep_time),
 202         ATTR_LIST(gc_max_sleep_time),
 203         ATTR_LIST(gc_no_gc_sleep_time),
 204         ATTR_LIST(gc_idle),
 205         ATTR_LIST(reclaim_segments),
 206         ATTR_LIST(max_small_discards),
 207         ATTR_LIST(batched_trim_sections),
 208         ATTR_LIST(ipu_policy),
 209         ATTR_LIST(min_ipu_util),
 210         ATTR_LIST(min_fsync_blocks),
 211         ATTR_LIST(min_hot_blocks),
 212         ATTR_LIST(max_victim_search),
 213         ATTR_LIST(dir_level),
 214         ATTR_LIST(ram_thresh),
 215         ATTR_LIST(ra_nid_pages),
 216         ATTR_LIST(dirty_nats_ratio),
 217         ATTR_LIST(cp_interval),
 218         ATTR_LIST(idle_interval),
 219 #ifdef CONFIG_F2FS_FAULT_INJECTION
 220         ATTR_LIST(inject_rate),
 221         ATTR_LIST(inject_type),
 222 #endif
 223         ATTR_LIST(lifetime_write_kbytes),
 224         ATTR_LIST(reserved_blocks),
 225         NULL,
 226 };
 227
 228 static const struct sysfs_ops f2fs_attr_ops = {
 229         .show   = f2fs_attr_show,
 230         .store  = f2fs_attr_store,
 231 };
 232
 233 static struct kobj_type f2fs_ktype = {
 234         .default_attrs  = f2fs_attrs,
 235         .sysfs_ops      = &f2fs_attr_ops,
 236         .release        = f2fs_sb_release,
 237 };
 238
 239 static int segment_info_seq_show(struct seq_file *seq, void *offset)
 240 {
 241         struct super_block *sb = seq->private;
 242         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 243         unsigned int total_segs =
 244                         le32_to_cpu(sbi->raw_super->segment_count_main);
 245         int i;
 246
 247         seq_puts(seq, "format: segment_type|valid_blocks\n"
 248                 "segment_type(0:HD, 1:WD, 2:CD, 3:HN, 4:WN, 5:CN)\n");
 249
 250         for (i = 0; i < total_segs; i++) {
 251                 struct seg_entry *se = get_seg_entry(sbi, i);
 252
 253                 if ((i % 10) == 0)
 254                         seq_printf(seq, "%-10d", i);
 255                 seq_printf(seq, "%d|%-3u", se->type,
 256                                         get_valid_blocks(sbi, i, false));
 257                 if ((i % 10) == 9 || i == (total_segs - 1))
 258                         seq_putc(seq, '\n');
 259                 else
 260                         seq_putc(seq, ' ');
 261         }
 262
 263         return 0;
 264 }
 265
 266 static int segment_bits_seq_show(struct seq_file *seq, void *offset)
 267 {
 268         struct super_block *sb = seq->private;
 269         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 270         unsigned int total_segs =
 271                         le32_to_cpu(sbi->raw_super->segment_count_main);
 272         int i, j;
 273
 274         seq_puts(seq, "format: segment_type|valid_blocks|bitmaps\n"
 275                 "segment_type(0:HD, 1:WD, 2:CD, 3:HN, 4:WN, 5:CN)\n");
 276
 277         for (i = 0; i < total_segs; i++) {
 278                 struct seg_entry *se = get_seg_entry(sbi, i);
 279
 280                 seq_printf(seq, "%-10d", i);
 281                 seq_printf(seq, "%d|%-3u|", se->type,
 282                                         get_valid_blocks(sbi, i, false));
 283                 for (j = 0; j < SIT_VBLOCK_MAP_SIZE; j++)
 284                         seq_printf(seq, " %.2x", se->cur_valid_map[j]);
 285                 seq_putc(seq, '\n');
 286         }
 287         return 0;
 288 }
 289
 290 #define F2FS_PROC_FILE_DEF(_name)                                       \
 291 static int _name##_open_fs(struct inode *inode, struct file *file)      \
 292 {                                                                       \
 293         return single_open(file, _name##_seq_show, PDE_DATA(inode));    \
 294 }                                                                       \
 295                                                                         \
 296 static const struct file_operations f2fs_seq_##_name##_fops = {         \
 297         .open = _name##_open_fs,                                        \
 298         .read = seq_read,                                               \
 299         .llseek = seq_lseek,                                            \
 300         .release = single_release,                                      \
 301 };
 302
 303 F2FS_PROC_FILE_DEF(segment_info);
 304 F2FS_PROC_FILE_DEF(segment_bits);
 305
 306 int __init f2fs_register_sysfs(void)
 307 {
 308         f2fs_proc_root = proc_mkdir("fs/f2fs", NULL);
 309
 310         f2fs_kset = kset_create_and_add("f2fs", NULL, fs_kobj);
 311         if (!f2fs_kset)
 312                 return -ENOMEM;
 313         return 0;
 314 }
 315
 316 void f2fs_unregister_sysfs(void)
 317 {
 318         kset_unregister(f2fs_kset);
 319         remove_proc_entry("fs/f2fs", NULL);
 320 }
 321
 322 int f2fs_init_sysfs(struct f2fs_sb_info *sbi)
 323 {
 324         struct super_block *sb = sbi->sb;
 325         int err;
 326
 327         if (f2fs_proc_root)
 328                 sbi->s_proc = proc_mkdir(sb->s_id, f2fs_proc_root);
 329
 330         if (sbi->s_proc) {
 331                 proc_create_data("segment_info", S_IRUGO, sbi->s_proc,
 332                                  &f2fs_seq_segment_info_fops, sb);
 333                 proc_create_data("segment_bits", S_IRUGO, sbi->s_proc,
 334                                  &f2fs_seq_segment_bits_fops, sb);
 335         }
 336
 337         sbi->s_kobj.kset = f2fs_kset;
 338         init_completion(&sbi->s_kobj_unregister);
 339         err = kobject_init_and_add(&sbi->s_kobj, &f2fs_ktype, NULL,
 340                                                         "%s", sb->s_id);
 341         if (err)
 342                 goto err_out;
 343         return 0;
 344 err_out:
 345         if (sbi->s_proc) {
 346                 remove_proc_entry("segment_info", sbi->s_proc);
 347                 remove_proc_entry("segment_bits", sbi->s_proc);
 348                 remove_proc_entry(sb->s_id, f2fs_proc_root);
 349         }
 350         return err;
 351 }
 352
 353 void f2fs_exit_sysfs(struct f2fs_sb_info *sbi)
 354 {
 355         kobject_del(&sbi->s_kobj);
 356         kobject_put(&sbi->s_kobj);
 357         wait_for_completion(&sbi->s_kobj_unregister);
 358
 359         if (sbi->s_proc) {
 360                 remove_proc_entry("segment_info", sbi->s_proc);
 361                 remove_proc_entry("segment_bits", sbi->s_proc);
 362                 remove_proc_entry(sbi->sb->s_id, f2fs_proc_root);
 363         }
 364 }