Theodore Ts'o | b579901 | 2015-09-23 12:44:17 -0400 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/ext4/sysfs.c |
| 3 | * |
| 4 | * Copyright (C) 1992, 1993, 1994, 1995 |
| 5 | * Remy Card (card@masi.ibp.fr) |
| 6 | * Theodore Ts'o (tytso@mit.edu) |
| 7 | * |
| 8 | */ |
| 9 | |
| 10 | #include <linux/time.h> |
| 11 | #include <linux/fs.h> |
| 12 | #include <linux/seq_file.h> |
| 13 | #include <linux/proc_fs.h> |
| 14 | |
| 15 | #include "ext4.h" |
| 16 | #include "ext4_jbd2.h" |
| 17 | |
Theodore Ts'o | 76d33bc | 2015-09-23 12:45:17 -0400 | [diff] [blame] | 18 | typedef enum { |
| 19 | attr_noop, |
| 20 | attr_delayed_allocation_blocks, |
| 21 | attr_session_write_kbytes, |
| 22 | attr_lifetime_write_kbytes, |
| 23 | attr_reserved_clusters, |
| 24 | attr_inode_readahead, |
| 25 | attr_trigger_test_error, |
| 26 | attr_feature, |
| 27 | attr_pointer_ui, |
| 28 | attr_pointer_atomic, |
| 29 | } attr_id_t; |
| 30 | |
| 31 | typedef enum { |
| 32 | ptr_explicit, |
| 33 | ptr_ext4_sb_info_offset, |
| 34 | ptr_ext4_super_block_offset, |
| 35 | } attr_ptr_t; |
| 36 | |
Theodore Ts'o | ebd173b | 2015-09-23 12:46:17 -0400 | [diff] [blame] | 37 | static const char *proc_dirname = "fs/ext4"; |
| 38 | static struct proc_dir_entry *ext4_proc_root; |
| 39 | |
Theodore Ts'o | b579901 | 2015-09-23 12:44:17 -0400 | [diff] [blame] | 40 | struct ext4_attr { |
| 41 | struct attribute attr; |
Theodore Ts'o | 76d33bc | 2015-09-23 12:45:17 -0400 | [diff] [blame] | 42 | short attr_id; |
| 43 | short attr_ptr; |
Theodore Ts'o | b579901 | 2015-09-23 12:44:17 -0400 | [diff] [blame] | 44 | union { |
| 45 | int offset; |
Theodore Ts'o | 76d33bc | 2015-09-23 12:45:17 -0400 | [diff] [blame] | 46 | void *explicit_ptr; |
Theodore Ts'o | b579901 | 2015-09-23 12:44:17 -0400 | [diff] [blame] | 47 | } u; |
| 48 | }; |
| 49 | |
Theodore Ts'o | b579901 | 2015-09-23 12:44:17 -0400 | [diff] [blame] | 50 | static ssize_t session_write_kbytes_show(struct ext4_attr *a, |
| 51 | struct ext4_sb_info *sbi, char *buf) |
| 52 | { |
| 53 | struct super_block *sb = sbi->s_buddy_cache->i_sb; |
| 54 | |
| 55 | if (!sb->s_bdev->bd_part) |
| 56 | return snprintf(buf, PAGE_SIZE, "0\n"); |
| 57 | return snprintf(buf, PAGE_SIZE, "%lu\n", |
| 58 | (part_stat_read(sb->s_bdev->bd_part, sectors[1]) - |
| 59 | sbi->s_sectors_written_start) >> 1); |
| 60 | } |
| 61 | |
| 62 | static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a, |
| 63 | struct ext4_sb_info *sbi, char *buf) |
| 64 | { |
| 65 | struct super_block *sb = sbi->s_buddy_cache->i_sb; |
| 66 | |
| 67 | if (!sb->s_bdev->bd_part) |
| 68 | return snprintf(buf, PAGE_SIZE, "0\n"); |
| 69 | return snprintf(buf, PAGE_SIZE, "%llu\n", |
| 70 | (unsigned long long)(sbi->s_kbytes_written + |
| 71 | ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) - |
| 72 | EXT4_SB(sb)->s_sectors_written_start) >> 1))); |
| 73 | } |
| 74 | |
| 75 | static ssize_t inode_readahead_blks_store(struct ext4_attr *a, |
| 76 | struct ext4_sb_info *sbi, |
| 77 | const char *buf, size_t count) |
| 78 | { |
| 79 | unsigned long t; |
| 80 | int ret; |
| 81 | |
| 82 | ret = kstrtoul(skip_spaces(buf), 0, &t); |
| 83 | if (ret) |
| 84 | return ret; |
| 85 | |
| 86 | if (t && (!is_power_of_2(t) || t > 0x40000000)) |
| 87 | return -EINVAL; |
| 88 | |
| 89 | sbi->s_inode_readahead_blks = t; |
| 90 | return count; |
| 91 | } |
| 92 | |
Theodore Ts'o | b579901 | 2015-09-23 12:44:17 -0400 | [diff] [blame] | 93 | static ssize_t reserved_clusters_store(struct ext4_attr *a, |
| 94 | struct ext4_sb_info *sbi, |
| 95 | const char *buf, size_t count) |
| 96 | { |
| 97 | unsigned long long val; |
| 98 | ext4_fsblk_t clusters = (ext4_blocks_count(sbi->s_es) >> |
| 99 | sbi->s_cluster_bits); |
Theodore Ts'o | 76d33bc | 2015-09-23 12:45:17 -0400 | [diff] [blame] | 100 | int ret; |
Theodore Ts'o | b579901 | 2015-09-23 12:44:17 -0400 | [diff] [blame] | 101 | |
Theodore Ts'o | 76d33bc | 2015-09-23 12:45:17 -0400 | [diff] [blame] | 102 | ret = kstrtoull(skip_spaces(buf), 0, &val); |
| 103 | if (!ret || val >= clusters) |
Theodore Ts'o | b579901 | 2015-09-23 12:44:17 -0400 | [diff] [blame] | 104 | return -EINVAL; |
| 105 | |
| 106 | atomic64_set(&sbi->s_resv_clusters, val); |
| 107 | return count; |
| 108 | } |
| 109 | |
| 110 | static ssize_t trigger_test_error(struct ext4_attr *a, |
| 111 | struct ext4_sb_info *sbi, |
| 112 | const char *buf, size_t count) |
| 113 | { |
| 114 | int len = count; |
| 115 | |
| 116 | if (!capable(CAP_SYS_ADMIN)) |
| 117 | return -EPERM; |
| 118 | |
| 119 | if (len && buf[len-1] == '\n') |
| 120 | len--; |
| 121 | |
| 122 | if (len) |
| 123 | ext4_error(sbi->s_sb, "%.*s", len, buf); |
| 124 | return count; |
| 125 | } |
| 126 | |
Theodore Ts'o | 76d33bc | 2015-09-23 12:45:17 -0400 | [diff] [blame] | 127 | #define EXT4_ATTR(_name,_mode,_id) \ |
Theodore Ts'o | b579901 | 2015-09-23 12:44:17 -0400 | [diff] [blame] | 128 | static struct ext4_attr ext4_attr_##_name = { \ |
| 129 | .attr = {.name = __stringify(_name), .mode = _mode }, \ |
Theodore Ts'o | 76d33bc | 2015-09-23 12:45:17 -0400 | [diff] [blame] | 130 | .attr_id = attr_##_id, \ |
Theodore Ts'o | b579901 | 2015-09-23 12:44:17 -0400 | [diff] [blame] | 131 | } |
| 132 | |
Theodore Ts'o | 76d33bc | 2015-09-23 12:45:17 -0400 | [diff] [blame] | 133 | #define EXT4_ATTR_FUNC(_name,_mode) EXT4_ATTR(_name,_mode,_name) |
Theodore Ts'o | b579901 | 2015-09-23 12:44:17 -0400 | [diff] [blame] | 134 | |
Theodore Ts'o | 76d33bc | 2015-09-23 12:45:17 -0400 | [diff] [blame] | 135 | #define EXT4_ATTR_FEATURE(_name) EXT4_ATTR(_name, 0444, feature) |
Theodore Ts'o | b579901 | 2015-09-23 12:44:17 -0400 | [diff] [blame] | 136 | |
Theodore Ts'o | 76d33bc | 2015-09-23 12:45:17 -0400 | [diff] [blame] | 137 | #define EXT4_ATTR_OFFSET(_name,_mode,_id,_struct,_elname) \ |
Theodore Ts'o | b579901 | 2015-09-23 12:44:17 -0400 | [diff] [blame] | 138 | static struct ext4_attr ext4_attr_##_name = { \ |
Theodore Ts'o | 76d33bc | 2015-09-23 12:45:17 -0400 | [diff] [blame] | 139 | .attr = {.name = __stringify(_name), .mode = _mode }, \ |
| 140 | .attr_id = attr_##_id, \ |
| 141 | .attr_ptr = ptr_##_struct##_offset, \ |
Theodore Ts'o | b579901 | 2015-09-23 12:44:17 -0400 | [diff] [blame] | 142 | .u = { \ |
Theodore Ts'o | 76d33bc | 2015-09-23 12:45:17 -0400 | [diff] [blame] | 143 | .offset = offsetof(struct _struct, _elname),\ |
Theodore Ts'o | b579901 | 2015-09-23 12:44:17 -0400 | [diff] [blame] | 144 | }, \ |
| 145 | } |
| 146 | |
Theodore Ts'o | 76d33bc | 2015-09-23 12:45:17 -0400 | [diff] [blame] | 147 | #define EXT4_RO_ATTR_ES_UI(_name,_elname) \ |
| 148 | EXT4_ATTR_OFFSET(_name, 0444, pointer_ui, ext4_super_block, _elname) |
| 149 | |
| 150 | #define EXT4_RW_ATTR_SBI_UI(_name,_elname) \ |
| 151 | EXT4_ATTR_OFFSET(_name, 0644, pointer_ui, ext4_sb_info, _elname) |
| 152 | |
| 153 | #define EXT4_ATTR_PTR(_name,_mode,_id,_ptr) \ |
| 154 | static struct ext4_attr ext4_attr_##_name = { \ |
| 155 | .attr = {.name = __stringify(_name), .mode = _mode }, \ |
| 156 | .attr_id = attr_##_id, \ |
| 157 | .attr_ptr = ptr_explicit, \ |
| 158 | .u = { \ |
| 159 | .explicit_ptr = _ptr, \ |
| 160 | }, \ |
| 161 | } |
| 162 | |
| 163 | #define ATTR_LIST(name) &ext4_attr_##name.attr |
| 164 | |
| 165 | EXT4_ATTR_FUNC(delayed_allocation_blocks, 0444); |
| 166 | EXT4_ATTR_FUNC(session_write_kbytes, 0444); |
| 167 | EXT4_ATTR_FUNC(lifetime_write_kbytes, 0444); |
| 168 | EXT4_ATTR_FUNC(reserved_clusters, 0644); |
| 169 | |
| 170 | EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, inode_readahead, |
| 171 | ext4_sb_info, s_inode_readahead_blks); |
Theodore Ts'o | b579901 | 2015-09-23 12:44:17 -0400 | [diff] [blame] | 172 | EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal); |
| 173 | EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats); |
| 174 | EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan); |
| 175 | EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan); |
| 176 | EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs); |
| 177 | EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request); |
| 178 | EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc); |
Theodore Ts'o | b579901 | 2015-09-23 12:44:17 -0400 | [diff] [blame] | 179 | EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb); |
Theodore Ts'o | 76d33bc | 2015-09-23 12:45:17 -0400 | [diff] [blame] | 180 | EXT4_ATTR(trigger_fs_error, 0200, trigger_test_error); |
Theodore Ts'o | b579901 | 2015-09-23 12:44:17 -0400 | [diff] [blame] | 181 | EXT4_RW_ATTR_SBI_UI(err_ratelimit_interval_ms, s_err_ratelimit_state.interval); |
| 182 | EXT4_RW_ATTR_SBI_UI(err_ratelimit_burst, s_err_ratelimit_state.burst); |
| 183 | EXT4_RW_ATTR_SBI_UI(warning_ratelimit_interval_ms, s_warning_ratelimit_state.interval); |
| 184 | EXT4_RW_ATTR_SBI_UI(warning_ratelimit_burst, s_warning_ratelimit_state.burst); |
| 185 | EXT4_RW_ATTR_SBI_UI(msg_ratelimit_interval_ms, s_msg_ratelimit_state.interval); |
| 186 | EXT4_RW_ATTR_SBI_UI(msg_ratelimit_burst, s_msg_ratelimit_state.burst); |
| 187 | EXT4_RO_ATTR_ES_UI(errors_count, s_error_count); |
| 188 | EXT4_RO_ATTR_ES_UI(first_error_time, s_first_error_time); |
| 189 | EXT4_RO_ATTR_ES_UI(last_error_time, s_last_error_time); |
| 190 | |
Theodore Ts'o | 76d33bc | 2015-09-23 12:45:17 -0400 | [diff] [blame] | 191 | static unsigned int old_bump_val = 128; |
| 192 | EXT4_ATTR_PTR(max_writeback_mb_bump, 0444, pointer_ui, &old_bump_val); |
| 193 | |
Theodore Ts'o | b579901 | 2015-09-23 12:44:17 -0400 | [diff] [blame] | 194 | static struct attribute *ext4_attrs[] = { |
| 195 | ATTR_LIST(delayed_allocation_blocks), |
| 196 | ATTR_LIST(session_write_kbytes), |
| 197 | ATTR_LIST(lifetime_write_kbytes), |
| 198 | ATTR_LIST(reserved_clusters), |
| 199 | ATTR_LIST(inode_readahead_blks), |
| 200 | ATTR_LIST(inode_goal), |
| 201 | ATTR_LIST(mb_stats), |
| 202 | ATTR_LIST(mb_max_to_scan), |
| 203 | ATTR_LIST(mb_min_to_scan), |
| 204 | ATTR_LIST(mb_order2_req), |
| 205 | ATTR_LIST(mb_stream_req), |
| 206 | ATTR_LIST(mb_group_prealloc), |
| 207 | ATTR_LIST(max_writeback_mb_bump), |
| 208 | ATTR_LIST(extent_max_zeroout_kb), |
| 209 | ATTR_LIST(trigger_fs_error), |
| 210 | ATTR_LIST(err_ratelimit_interval_ms), |
| 211 | ATTR_LIST(err_ratelimit_burst), |
| 212 | ATTR_LIST(warning_ratelimit_interval_ms), |
| 213 | ATTR_LIST(warning_ratelimit_burst), |
| 214 | ATTR_LIST(msg_ratelimit_interval_ms), |
| 215 | ATTR_LIST(msg_ratelimit_burst), |
| 216 | ATTR_LIST(errors_count), |
| 217 | ATTR_LIST(first_error_time), |
| 218 | ATTR_LIST(last_error_time), |
| 219 | NULL, |
| 220 | }; |
| 221 | |
| 222 | /* Features this copy of ext4 supports */ |
Theodore Ts'o | 76d33bc | 2015-09-23 12:45:17 -0400 | [diff] [blame] | 223 | EXT4_ATTR_FEATURE(lazy_itable_init); |
| 224 | EXT4_ATTR_FEATURE(batched_discard); |
| 225 | EXT4_ATTR_FEATURE(meta_bg_resize); |
| 226 | EXT4_ATTR_FEATURE(encryption); |
Darrick J. Wong | 8c81bd8 | 2015-10-17 16:16:02 -0400 | [diff] [blame] | 227 | EXT4_ATTR_FEATURE(metadata_csum_seed); |
Theodore Ts'o | b579901 | 2015-09-23 12:44:17 -0400 | [diff] [blame] | 228 | |
| 229 | static struct attribute *ext4_feat_attrs[] = { |
| 230 | ATTR_LIST(lazy_itable_init), |
| 231 | ATTR_LIST(batched_discard), |
| 232 | ATTR_LIST(meta_bg_resize), |
| 233 | ATTR_LIST(encryption), |
Darrick J. Wong | 8c81bd8 | 2015-10-17 16:16:02 -0400 | [diff] [blame] | 234 | ATTR_LIST(metadata_csum_seed), |
Theodore Ts'o | b579901 | 2015-09-23 12:44:17 -0400 | [diff] [blame] | 235 | NULL, |
| 236 | }; |
| 237 | |
Theodore Ts'o | 76d33bc | 2015-09-23 12:45:17 -0400 | [diff] [blame] | 238 | static void *calc_ptr(struct ext4_attr *a, struct ext4_sb_info *sbi) |
| 239 | { |
| 240 | switch (a->attr_ptr) { |
| 241 | case ptr_explicit: |
| 242 | return a->u.explicit_ptr; |
| 243 | case ptr_ext4_sb_info_offset: |
| 244 | return (void *) (((char *) sbi) + a->u.offset); |
| 245 | case ptr_ext4_super_block_offset: |
| 246 | return (void *) (((char *) sbi->s_es) + a->u.offset); |
| 247 | } |
| 248 | return NULL; |
| 249 | } |
| 250 | |
Theodore Ts'o | b579901 | 2015-09-23 12:44:17 -0400 | [diff] [blame] | 251 | static ssize_t ext4_attr_show(struct kobject *kobj, |
| 252 | struct attribute *attr, char *buf) |
| 253 | { |
| 254 | struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, |
| 255 | s_kobj); |
| 256 | struct ext4_attr *a = container_of(attr, struct ext4_attr, attr); |
Theodore Ts'o | 76d33bc | 2015-09-23 12:45:17 -0400 | [diff] [blame] | 257 | void *ptr = calc_ptr(a, sbi); |
Theodore Ts'o | b579901 | 2015-09-23 12:44:17 -0400 | [diff] [blame] | 258 | |
Theodore Ts'o | 76d33bc | 2015-09-23 12:45:17 -0400 | [diff] [blame] | 259 | switch (a->attr_id) { |
| 260 | case attr_delayed_allocation_blocks: |
| 261 | return snprintf(buf, PAGE_SIZE, "%llu\n", |
| 262 | (s64) EXT4_C2B(sbi, |
| 263 | percpu_counter_sum(&sbi->s_dirtyclusters_counter))); |
| 264 | case attr_session_write_kbytes: |
| 265 | return session_write_kbytes_show(a, sbi, buf); |
| 266 | case attr_lifetime_write_kbytes: |
| 267 | return lifetime_write_kbytes_show(a, sbi, buf); |
| 268 | case attr_reserved_clusters: |
| 269 | return snprintf(buf, PAGE_SIZE, "%llu\n", |
| 270 | (unsigned long long) |
| 271 | atomic64_read(&sbi->s_resv_clusters)); |
| 272 | case attr_inode_readahead: |
| 273 | case attr_pointer_ui: |
| 274 | if (!ptr) |
| 275 | return 0; |
| 276 | return snprintf(buf, PAGE_SIZE, "%u\n", |
| 277 | *((unsigned int *) ptr)); |
| 278 | case attr_pointer_atomic: |
| 279 | if (!ptr) |
| 280 | return 0; |
| 281 | return snprintf(buf, PAGE_SIZE, "%d\n", |
| 282 | atomic_read((atomic_t *) ptr)); |
| 283 | case attr_feature: |
| 284 | return snprintf(buf, PAGE_SIZE, "supported\n"); |
| 285 | } |
| 286 | |
| 287 | return 0; |
Theodore Ts'o | b579901 | 2015-09-23 12:44:17 -0400 | [diff] [blame] | 288 | } |
| 289 | |
| 290 | static ssize_t ext4_attr_store(struct kobject *kobj, |
| 291 | struct attribute *attr, |
| 292 | const char *buf, size_t len) |
| 293 | { |
| 294 | struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, |
| 295 | s_kobj); |
| 296 | struct ext4_attr *a = container_of(attr, struct ext4_attr, attr); |
Theodore Ts'o | 76d33bc | 2015-09-23 12:45:17 -0400 | [diff] [blame] | 297 | void *ptr = calc_ptr(a, sbi); |
| 298 | unsigned long t; |
| 299 | int ret; |
Theodore Ts'o | b579901 | 2015-09-23 12:44:17 -0400 | [diff] [blame] | 300 | |
Theodore Ts'o | 76d33bc | 2015-09-23 12:45:17 -0400 | [diff] [blame] | 301 | switch (a->attr_id) { |
| 302 | case attr_reserved_clusters: |
| 303 | return reserved_clusters_store(a, sbi, buf, len); |
| 304 | case attr_pointer_ui: |
| 305 | if (!ptr) |
| 306 | return 0; |
| 307 | ret = kstrtoul(skip_spaces(buf), 0, &t); |
| 308 | if (ret) |
| 309 | return ret; |
| 310 | *((unsigned int *) ptr) = t; |
| 311 | return len; |
| 312 | case attr_inode_readahead: |
| 313 | return inode_readahead_blks_store(a, sbi, buf, len); |
| 314 | case attr_trigger_test_error: |
| 315 | return trigger_test_error(a, sbi, buf, len); |
| 316 | } |
| 317 | return 0; |
Theodore Ts'o | b579901 | 2015-09-23 12:44:17 -0400 | [diff] [blame] | 318 | } |
| 319 | |
| 320 | static void ext4_sb_release(struct kobject *kobj) |
| 321 | { |
| 322 | struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, |
| 323 | s_kobj); |
| 324 | complete(&sbi->s_kobj_unregister); |
| 325 | } |
| 326 | |
| 327 | static const struct sysfs_ops ext4_attr_ops = { |
| 328 | .show = ext4_attr_show, |
| 329 | .store = ext4_attr_store, |
| 330 | }; |
| 331 | |
| 332 | static struct kobj_type ext4_sb_ktype = { |
| 333 | .default_attrs = ext4_attrs, |
| 334 | .sysfs_ops = &ext4_attr_ops, |
| 335 | .release = ext4_sb_release, |
| 336 | }; |
| 337 | |
| 338 | static struct kobj_type ext4_ktype = { |
| 339 | .sysfs_ops = &ext4_attr_ops, |
| 340 | }; |
| 341 | |
| 342 | static struct kset ext4_kset = { |
| 343 | .kobj = {.ktype = &ext4_ktype}, |
| 344 | }; |
| 345 | |
Theodore Ts'o | b579901 | 2015-09-23 12:44:17 -0400 | [diff] [blame] | 346 | static struct kobj_type ext4_feat_ktype = { |
| 347 | .default_attrs = ext4_feat_attrs, |
Theodore Ts'o | 76d33bc | 2015-09-23 12:45:17 -0400 | [diff] [blame] | 348 | .sysfs_ops = &ext4_attr_ops, |
Theodore Ts'o | b579901 | 2015-09-23 12:44:17 -0400 | [diff] [blame] | 349 | }; |
| 350 | |
| 351 | static struct kobject ext4_feat = { |
| 352 | .kset = &ext4_kset, |
| 353 | }; |
| 354 | |
Theodore Ts'o | ebd173b | 2015-09-23 12:46:17 -0400 | [diff] [blame] | 355 | #define PROC_FILE_SHOW_DEFN(name) \ |
| 356 | static int name##_open(struct inode *inode, struct file *file) \ |
| 357 | { \ |
| 358 | return single_open(file, ext4_seq_##name##_show, PDE_DATA(inode)); \ |
| 359 | } \ |
| 360 | \ |
Xu Cang | 681c46b | 2015-11-26 15:52:24 -0500 | [diff] [blame^] | 361 | static const struct file_operations ext4_seq_##name##_fops = { \ |
Theodore Ts'o | ebd173b | 2015-09-23 12:46:17 -0400 | [diff] [blame] | 362 | .owner = THIS_MODULE, \ |
| 363 | .open = name##_open, \ |
| 364 | .read = seq_read, \ |
| 365 | .llseek = seq_lseek, \ |
| 366 | .release = single_release, \ |
| 367 | } |
| 368 | |
| 369 | #define PROC_FILE_LIST(name) \ |
| 370 | { __stringify(name), &ext4_seq_##name##_fops } |
| 371 | |
| 372 | PROC_FILE_SHOW_DEFN(es_shrinker_info); |
| 373 | PROC_FILE_SHOW_DEFN(options); |
| 374 | |
| 375 | static struct ext4_proc_files { |
| 376 | const char *name; |
| 377 | const struct file_operations *fops; |
| 378 | } proc_files[] = { |
| 379 | PROC_FILE_LIST(options), |
| 380 | PROC_FILE_LIST(es_shrinker_info), |
| 381 | PROC_FILE_LIST(mb_groups), |
| 382 | { NULL, NULL }, |
| 383 | }; |
| 384 | |
Theodore Ts'o | b579901 | 2015-09-23 12:44:17 -0400 | [diff] [blame] | 385 | int ext4_register_sysfs(struct super_block *sb) |
| 386 | { |
| 387 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
Theodore Ts'o | ebd173b | 2015-09-23 12:46:17 -0400 | [diff] [blame] | 388 | struct ext4_proc_files *p; |
| 389 | int err; |
Theodore Ts'o | b579901 | 2015-09-23 12:44:17 -0400 | [diff] [blame] | 390 | |
| 391 | sbi->s_kobj.kset = &ext4_kset; |
| 392 | init_completion(&sbi->s_kobj_unregister); |
Theodore Ts'o | ebd173b | 2015-09-23 12:46:17 -0400 | [diff] [blame] | 393 | err = kobject_init_and_add(&sbi->s_kobj, &ext4_sb_ktype, NULL, |
| 394 | "%s", sb->s_id); |
| 395 | if (err) |
| 396 | return err; |
| 397 | |
| 398 | if (ext4_proc_root) |
| 399 | sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root); |
| 400 | |
| 401 | if (sbi->s_proc) { |
| 402 | for (p = proc_files; p->name; p++) |
| 403 | proc_create_data(p->name, S_IRUGO, sbi->s_proc, |
| 404 | p->fops, sb); |
| 405 | } |
| 406 | return 0; |
| 407 | } |
| 408 | |
| 409 | void ext4_unregister_sysfs(struct super_block *sb) |
| 410 | { |
| 411 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
| 412 | struct ext4_proc_files *p; |
| 413 | |
| 414 | if (sbi->s_proc) { |
| 415 | for (p = proc_files; p->name; p++) |
| 416 | remove_proc_entry(p->name, sbi->s_proc); |
| 417 | remove_proc_entry(sb->s_id, ext4_proc_root); |
| 418 | } |
| 419 | kobject_del(&sbi->s_kobj); |
Theodore Ts'o | b579901 | 2015-09-23 12:44:17 -0400 | [diff] [blame] | 420 | } |
| 421 | |
| 422 | int __init ext4_init_sysfs(void) |
| 423 | { |
| 424 | int ret; |
| 425 | |
| 426 | kobject_set_name(&ext4_kset.kobj, "ext4"); |
| 427 | ext4_kset.kobj.parent = fs_kobj; |
| 428 | ret = kset_register(&ext4_kset); |
| 429 | if (ret) |
| 430 | return ret; |
| 431 | |
| 432 | ret = kobject_init_and_add(&ext4_feat, &ext4_feat_ktype, |
| 433 | NULL, "features"); |
| 434 | if (ret) |
| 435 | kset_unregister(&ext4_kset); |
Theodore Ts'o | ebd173b | 2015-09-23 12:46:17 -0400 | [diff] [blame] | 436 | else |
| 437 | ext4_proc_root = proc_mkdir(proc_dirname, NULL); |
Theodore Ts'o | b579901 | 2015-09-23 12:44:17 -0400 | [diff] [blame] | 438 | return ret; |
| 439 | } |
| 440 | |
| 441 | void ext4_exit_sysfs(void) |
| 442 | { |
| 443 | kobject_put(&ext4_feat); |
| 444 | kset_unregister(&ext4_kset); |
Theodore Ts'o | ebd173b | 2015-09-23 12:46:17 -0400 | [diff] [blame] | 445 | remove_proc_entry(proc_dirname, NULL); |
| 446 | ext4_proc_root = NULL; |
Theodore Ts'o | b579901 | 2015-09-23 12:44:17 -0400 | [diff] [blame] | 447 | } |
| 448 | |