1 // SPDX-License-Identifier: GPL-2.0
3 * linux/fs/ext4/sysfs.c
5 * Copyright (C) 1992, 1993, 1994, 1995
6 * Remy Card (card@masi.ibp.fr)
7 * Theodore Ts'o (tytso@mit.edu)
11 #include <linux/time.h>
13 #include <linux/seq_file.h>
14 #include <linux/slab.h>
15 #include <linux/proc_fs.h>
18 #include "ext4_jbd2.h"
22 attr_delayed_allocation_blocks,
23 attr_session_write_kbytes,
24 attr_lifetime_write_kbytes,
25 attr_reserved_clusters,
27 attr_trigger_test_error,
35 ptr_ext4_sb_info_offset,
36 ptr_ext4_super_block_offset,
39 static const char proc_dirname[] = "fs/ext4";
40 static struct proc_dir_entry *ext4_proc_root;
43 struct attribute attr;
52 static ssize_t session_write_kbytes_show(struct ext4_attr *a,
53 struct ext4_sb_info *sbi, char *buf)
55 struct super_block *sb = sbi->s_buddy_cache->i_sb;
57 if (!sb->s_bdev->bd_part)
58 return snprintf(buf, PAGE_SIZE, "0\n");
59 return snprintf(buf, PAGE_SIZE, "%lu\n",
60 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
61 sbi->s_sectors_written_start) >> 1);
64 static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
65 struct ext4_sb_info *sbi, char *buf)
67 struct super_block *sb = sbi->s_buddy_cache->i_sb;
69 if (!sb->s_bdev->bd_part)
70 return snprintf(buf, PAGE_SIZE, "0\n");
71 return snprintf(buf, PAGE_SIZE, "%llu\n",
72 (unsigned long long)(sbi->s_kbytes_written +
73 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
74 EXT4_SB(sb)->s_sectors_written_start) >> 1)));
77 static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
78 struct ext4_sb_info *sbi,
79 const char *buf, size_t count)
84 ret = kstrtoul(skip_spaces(buf), 0, &t);
88 if (t && (!is_power_of_2(t) || t > 0x40000000))
91 sbi->s_inode_readahead_blks = t;
95 static ssize_t reserved_clusters_store(struct ext4_attr *a,
96 struct ext4_sb_info *sbi,
97 const char *buf, size_t count)
99 unsigned long long val;
100 ext4_fsblk_t clusters = (ext4_blocks_count(sbi->s_es) >>
101 sbi->s_cluster_bits);
104 ret = kstrtoull(skip_spaces(buf), 0, &val);
105 if (ret || val >= clusters)
108 atomic64_set(&sbi->s_resv_clusters, val);
112 static ssize_t trigger_test_error(struct ext4_attr *a,
113 struct ext4_sb_info *sbi,
114 const char *buf, size_t count)
118 if (!capable(CAP_SYS_ADMIN))
121 if (len && buf[len-1] == '\n')
125 ext4_error(sbi->s_sb, "%.*s", len, buf);
129 #define EXT4_ATTR(_name,_mode,_id) \
130 static struct ext4_attr ext4_attr_##_name = { \
131 .attr = {.name = __stringify(_name), .mode = _mode }, \
132 .attr_id = attr_##_id, \
135 #define EXT4_ATTR_FUNC(_name,_mode) EXT4_ATTR(_name,_mode,_name)
137 #define EXT4_ATTR_FEATURE(_name) EXT4_ATTR(_name, 0444, feature)
139 #define EXT4_ATTR_OFFSET(_name,_mode,_id,_struct,_elname) \
140 static struct ext4_attr ext4_attr_##_name = { \
141 .attr = {.name = __stringify(_name), .mode = _mode }, \
142 .attr_id = attr_##_id, \
143 .attr_ptr = ptr_##_struct##_offset, \
145 .offset = offsetof(struct _struct, _elname),\
149 #define EXT4_RO_ATTR_ES_UI(_name,_elname) \
150 EXT4_ATTR_OFFSET(_name, 0444, pointer_ui, ext4_super_block, _elname)
152 #define EXT4_RW_ATTR_SBI_UI(_name,_elname) \
153 EXT4_ATTR_OFFSET(_name, 0644, pointer_ui, ext4_sb_info, _elname)
155 #define EXT4_ATTR_PTR(_name,_mode,_id,_ptr) \
156 static struct ext4_attr ext4_attr_##_name = { \
157 .attr = {.name = __stringify(_name), .mode = _mode }, \
158 .attr_id = attr_##_id, \
159 .attr_ptr = ptr_explicit, \
161 .explicit_ptr = _ptr, \
165 #define ATTR_LIST(name) &ext4_attr_##name.attr
167 EXT4_ATTR_FUNC(delayed_allocation_blocks, 0444);
168 EXT4_ATTR_FUNC(session_write_kbytes, 0444);
169 EXT4_ATTR_FUNC(lifetime_write_kbytes, 0444);
170 EXT4_ATTR_FUNC(reserved_clusters, 0644);
172 EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, inode_readahead,
173 ext4_sb_info, s_inode_readahead_blks);
174 EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
175 EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
176 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
177 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
178 EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
179 EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
180 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
181 EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb);
182 EXT4_ATTR(trigger_fs_error, 0200, trigger_test_error);
183 EXT4_RW_ATTR_SBI_UI(err_ratelimit_interval_ms, s_err_ratelimit_state.interval);
184 EXT4_RW_ATTR_SBI_UI(err_ratelimit_burst, s_err_ratelimit_state.burst);
185 EXT4_RW_ATTR_SBI_UI(warning_ratelimit_interval_ms, s_warning_ratelimit_state.interval);
186 EXT4_RW_ATTR_SBI_UI(warning_ratelimit_burst, s_warning_ratelimit_state.burst);
187 EXT4_RW_ATTR_SBI_UI(msg_ratelimit_interval_ms, s_msg_ratelimit_state.interval);
188 EXT4_RW_ATTR_SBI_UI(msg_ratelimit_burst, s_msg_ratelimit_state.burst);
189 EXT4_RO_ATTR_ES_UI(errors_count, s_error_count);
190 EXT4_RO_ATTR_ES_UI(first_error_time, s_first_error_time);
191 EXT4_RO_ATTR_ES_UI(last_error_time, s_last_error_time);
193 static unsigned int old_bump_val = 128;
194 EXT4_ATTR_PTR(max_writeback_mb_bump, 0444, pointer_ui, &old_bump_val);
196 static struct attribute *ext4_attrs[] = {
197 ATTR_LIST(delayed_allocation_blocks),
198 ATTR_LIST(session_write_kbytes),
199 ATTR_LIST(lifetime_write_kbytes),
200 ATTR_LIST(reserved_clusters),
201 ATTR_LIST(inode_readahead_blks),
202 ATTR_LIST(inode_goal),
204 ATTR_LIST(mb_max_to_scan),
205 ATTR_LIST(mb_min_to_scan),
206 ATTR_LIST(mb_order2_req),
207 ATTR_LIST(mb_stream_req),
208 ATTR_LIST(mb_group_prealloc),
209 ATTR_LIST(max_writeback_mb_bump),
210 ATTR_LIST(extent_max_zeroout_kb),
211 ATTR_LIST(trigger_fs_error),
212 ATTR_LIST(err_ratelimit_interval_ms),
213 ATTR_LIST(err_ratelimit_burst),
214 ATTR_LIST(warning_ratelimit_interval_ms),
215 ATTR_LIST(warning_ratelimit_burst),
216 ATTR_LIST(msg_ratelimit_interval_ms),
217 ATTR_LIST(msg_ratelimit_burst),
218 ATTR_LIST(errors_count),
219 ATTR_LIST(first_error_time),
220 ATTR_LIST(last_error_time),
224 /* Features this copy of ext4 supports */
225 EXT4_ATTR_FEATURE(lazy_itable_init);
226 EXT4_ATTR_FEATURE(batched_discard);
227 EXT4_ATTR_FEATURE(meta_bg_resize);
228 #ifdef CONFIG_EXT4_FS_ENCRYPTION
229 EXT4_ATTR_FEATURE(encryption);
231 EXT4_ATTR_FEATURE(metadata_csum_seed);
233 static struct attribute *ext4_feat_attrs[] = {
234 ATTR_LIST(lazy_itable_init),
235 ATTR_LIST(batched_discard),
236 ATTR_LIST(meta_bg_resize),
237 #ifdef CONFIG_EXT4_FS_ENCRYPTION
238 ATTR_LIST(encryption),
240 ATTR_LIST(metadata_csum_seed),
244 static void *calc_ptr(struct ext4_attr *a, struct ext4_sb_info *sbi)
246 switch (a->attr_ptr) {
248 return a->u.explicit_ptr;
249 case ptr_ext4_sb_info_offset:
250 return (void *) (((char *) sbi) + a->u.offset);
251 case ptr_ext4_super_block_offset:
252 return (void *) (((char *) sbi->s_es) + a->u.offset);
257 static ssize_t ext4_attr_show(struct kobject *kobj,
258 struct attribute *attr, char *buf)
260 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
262 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
263 void *ptr = calc_ptr(a, sbi);
265 switch (a->attr_id) {
266 case attr_delayed_allocation_blocks:
267 return snprintf(buf, PAGE_SIZE, "%llu\n",
269 percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
270 case attr_session_write_kbytes:
271 return session_write_kbytes_show(a, sbi, buf);
272 case attr_lifetime_write_kbytes:
273 return lifetime_write_kbytes_show(a, sbi, buf);
274 case attr_reserved_clusters:
275 return snprintf(buf, PAGE_SIZE, "%llu\n",
277 atomic64_read(&sbi->s_resv_clusters));
278 case attr_inode_readahead:
279 case attr_pointer_ui:
282 return snprintf(buf, PAGE_SIZE, "%u\n",
283 *((unsigned int *) ptr));
284 case attr_pointer_atomic:
287 return snprintf(buf, PAGE_SIZE, "%d\n",
288 atomic_read((atomic_t *) ptr));
290 return snprintf(buf, PAGE_SIZE, "supported\n");
296 static ssize_t ext4_attr_store(struct kobject *kobj,
297 struct attribute *attr,
298 const char *buf, size_t len)
300 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
302 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
303 void *ptr = calc_ptr(a, sbi);
307 switch (a->attr_id) {
308 case attr_reserved_clusters:
309 return reserved_clusters_store(a, sbi, buf, len);
310 case attr_pointer_ui:
313 ret = kstrtoul(skip_spaces(buf), 0, &t);
316 *((unsigned int *) ptr) = t;
318 case attr_inode_readahead:
319 return inode_readahead_blks_store(a, sbi, buf, len);
320 case attr_trigger_test_error:
321 return trigger_test_error(a, sbi, buf, len);
326 static void ext4_sb_release(struct kobject *kobj)
328 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
330 complete(&sbi->s_kobj_unregister);
333 static void ext4_kset_release(struct kobject *kobj)
335 struct kset *kset = container_of(kobj, struct kset, kobj);
340 static const struct sysfs_ops ext4_attr_ops = {
341 .show = ext4_attr_show,
342 .store = ext4_attr_store,
345 static struct kobj_type ext4_sb_ktype = {
346 .default_attrs = ext4_attrs,
347 .sysfs_ops = &ext4_attr_ops,
348 .release = ext4_sb_release,
351 static struct kobj_type ext4_ktype = {
352 .sysfs_ops = &ext4_attr_ops,
353 .release = ext4_kset_release,
356 static struct kset *ext4_kset;
358 static struct kobj_type ext4_feat_ktype = {
359 .default_attrs = ext4_feat_attrs,
360 .sysfs_ops = &ext4_attr_ops,
361 .release = (void (*)(struct kobject *))kfree,
364 static struct kobject *ext4_feat;
366 #define PROC_FILE_SHOW_DEFN(name) \
367 static int name##_open(struct inode *inode, struct file *file) \
369 return single_open(file, ext4_seq_##name##_show, PDE_DATA(inode)); \
372 static const struct file_operations ext4_seq_##name##_fops = { \
373 .open = name##_open, \
375 .llseek = seq_lseek, \
376 .release = single_release, \
379 #define PROC_FILE_LIST(name) \
380 { __stringify(name), &ext4_seq_##name##_fops }
382 PROC_FILE_SHOW_DEFN(es_shrinker_info);
383 PROC_FILE_SHOW_DEFN(options);
385 static const struct ext4_proc_files {
387 const struct file_operations *fops;
389 PROC_FILE_LIST(options),
390 PROC_FILE_LIST(es_shrinker_info),
391 PROC_FILE_LIST(mb_groups),
395 int ext4_register_sysfs(struct super_block *sb)
397 struct ext4_sb_info *sbi = EXT4_SB(sb);
398 const struct ext4_proc_files *p;
401 sbi->s_kobj.kset = ext4_kset;
402 init_completion(&sbi->s_kobj_unregister);
403 err = kobject_init_and_add(&sbi->s_kobj, &ext4_sb_ktype, NULL,
406 kobject_put(&sbi->s_kobj);
407 wait_for_completion(&sbi->s_kobj_unregister);
412 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
415 for (p = proc_files; p->name; p++)
416 proc_create_data(p->name, S_IRUGO, sbi->s_proc,
422 void ext4_unregister_sysfs(struct super_block *sb)
424 struct ext4_sb_info *sbi = EXT4_SB(sb);
425 const struct ext4_proc_files *p;
428 for (p = proc_files; p->name; p++)
429 remove_proc_entry(p->name, sbi->s_proc);
430 remove_proc_entry(sb->s_id, ext4_proc_root);
432 kobject_del(&sbi->s_kobj);
435 int __init ext4_init_sysfs(void)
439 ext4_kset = kzalloc(sizeof(*ext4_kset), GFP_KERNEL);
443 kobject_set_name(&ext4_kset->kobj, "ext4");
444 ext4_kset->kobj.parent = fs_kobj;
445 ext4_kset->kobj.ktype = &ext4_ktype;
446 ret = kset_register(ext4_kset);
450 ext4_feat = kzalloc(sizeof(*ext4_feat), GFP_KERNEL);
456 ext4_feat->kset = ext4_kset;
457 ret = kobject_init_and_add(ext4_feat, &ext4_feat_ktype,
462 ext4_proc_root = proc_mkdir(proc_dirname, NULL);
466 kobject_put(ext4_feat);
468 kset_unregister(ext4_kset);
473 void ext4_exit_sysfs(void)
475 kobject_put(ext4_feat);
476 kset_unregister(ext4_kset);
478 remove_proc_entry(proc_dirname, NULL);
479 ext4_proc_root = NULL;