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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
18typedef 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
31typedef enum {
32 ptr_explicit,
33 ptr_ext4_sb_info_offset,
34 ptr_ext4_super_block_offset,
35} attr_ptr_t;
36
37static const char *proc_dirname = "fs/ext4";
38static struct proc_dir_entry *ext4_proc_root;
39
40struct ext4_attr {
41 struct attribute attr;
42 short attr_id;
43 short attr_ptr;
44 union {
45 int offset;
46 void *explicit_ptr;
47 } u;
48};
49
50static 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
62static 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
75static 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
93static 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);
100 int ret;
101
102 ret = kstrtoull(skip_spaces(buf), 0, &val);
103 if (!ret || val >= clusters)
104 return -EINVAL;
105
106 atomic64_set(&sbi->s_resv_clusters, val);
107 return count;
108}
109
110static 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
127#define EXT4_ATTR(_name,_mode,_id) \
128static struct ext4_attr ext4_attr_##_name = { \
129 .attr = {.name = __stringify(_name), .mode = _mode }, \
130 .attr_id = attr_##_id, \
131}
132
133#define EXT4_ATTR_FUNC(_name,_mode) EXT4_ATTR(_name,_mode,_name)
134
135#define EXT4_ATTR_FEATURE(_name) EXT4_ATTR(_name, 0444, feature)
136
137#define EXT4_ATTR_OFFSET(_name,_mode,_id,_struct,_elname) \
138static struct ext4_attr ext4_attr_##_name = { \
139 .attr = {.name = __stringify(_name), .mode = _mode }, \
140 .attr_id = attr_##_id, \
141 .attr_ptr = ptr_##_struct##_offset, \
142 .u = { \
143 .offset = offsetof(struct _struct, _elname),\
144 }, \
145}
146
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) \
154static 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
165EXT4_ATTR_FUNC(delayed_allocation_blocks, 0444);
166EXT4_ATTR_FUNC(session_write_kbytes, 0444);
167EXT4_ATTR_FUNC(lifetime_write_kbytes, 0444);
168EXT4_ATTR_FUNC(reserved_clusters, 0644);
169
170EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, inode_readahead,
171 ext4_sb_info, s_inode_readahead_blks);
172EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
173EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
174EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
175EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
176EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
177EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
178EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
179EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb);
180EXT4_ATTR(trigger_fs_error, 0200, trigger_test_error);
181EXT4_RW_ATTR_SBI_UI(err_ratelimit_interval_ms, s_err_ratelimit_state.interval);
182EXT4_RW_ATTR_SBI_UI(err_ratelimit_burst, s_err_ratelimit_state.burst);
183EXT4_RW_ATTR_SBI_UI(warning_ratelimit_interval_ms, s_warning_ratelimit_state.interval);
184EXT4_RW_ATTR_SBI_UI(warning_ratelimit_burst, s_warning_ratelimit_state.burst);
185EXT4_RW_ATTR_SBI_UI(msg_ratelimit_interval_ms, s_msg_ratelimit_state.interval);
186EXT4_RW_ATTR_SBI_UI(msg_ratelimit_burst, s_msg_ratelimit_state.burst);
187EXT4_RO_ATTR_ES_UI(errors_count, s_error_count);
188EXT4_RO_ATTR_ES_UI(first_error_time, s_first_error_time);
189EXT4_RO_ATTR_ES_UI(last_error_time, s_last_error_time);
190
191static unsigned int old_bump_val = 128;
192EXT4_ATTR_PTR(max_writeback_mb_bump, 0444, pointer_ui, &old_bump_val);
193
194static 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 */
223EXT4_ATTR_FEATURE(lazy_itable_init);
224EXT4_ATTR_FEATURE(batched_discard);
225EXT4_ATTR_FEATURE(meta_bg_resize);
226#ifdef CONFIG_EXT4_FS_ENCRYPTION
227EXT4_ATTR_FEATURE(encryption);
228#endif
229EXT4_ATTR_FEATURE(metadata_csum_seed);
230
231static struct attribute *ext4_feat_attrs[] = {
232 ATTR_LIST(lazy_itable_init),
233 ATTR_LIST(batched_discard),
234 ATTR_LIST(meta_bg_resize),
235#ifdef CONFIG_EXT4_FS_ENCRYPTION
236 ATTR_LIST(encryption),
237#endif
238 ATTR_LIST(metadata_csum_seed),
239 NULL,
240};
241
242static void *calc_ptr(struct ext4_attr *a, struct ext4_sb_info *sbi)
243{
244 switch (a->attr_ptr) {
245 case ptr_explicit:
246 return a->u.explicit_ptr;
247 case ptr_ext4_sb_info_offset:
248 return (void *) (((char *) sbi) + a->u.offset);
249 case ptr_ext4_super_block_offset:
250 return (void *) (((char *) sbi->s_es) + a->u.offset);
251 }
252 return NULL;
253}
254
255static ssize_t ext4_attr_show(struct kobject *kobj,
256 struct attribute *attr, char *buf)
257{
258 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
259 s_kobj);
260 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
261 void *ptr = calc_ptr(a, sbi);
262
263 switch (a->attr_id) {
264 case attr_delayed_allocation_blocks:
265 return snprintf(buf, PAGE_SIZE, "%llu\n",
266 (s64) EXT4_C2B(sbi,
267 percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
268 case attr_session_write_kbytes:
269 return session_write_kbytes_show(a, sbi, buf);
270 case attr_lifetime_write_kbytes:
271 return lifetime_write_kbytes_show(a, sbi, buf);
272 case attr_reserved_clusters:
273 return snprintf(buf, PAGE_SIZE, "%llu\n",
274 (unsigned long long)
275 atomic64_read(&sbi->s_resv_clusters));
276 case attr_inode_readahead:
277 case attr_pointer_ui:
278 if (!ptr)
279 return 0;
280 return snprintf(buf, PAGE_SIZE, "%u\n",
281 *((unsigned int *) ptr));
282 case attr_pointer_atomic:
283 if (!ptr)
284 return 0;
285 return snprintf(buf, PAGE_SIZE, "%d\n",
286 atomic_read((atomic_t *) ptr));
287 case attr_feature:
288 return snprintf(buf, PAGE_SIZE, "supported\n");
289 }
290
291 return 0;
292}
293
294static ssize_t ext4_attr_store(struct kobject *kobj,
295 struct attribute *attr,
296 const char *buf, size_t len)
297{
298 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
299 s_kobj);
300 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
301 void *ptr = calc_ptr(a, sbi);
302 unsigned long t;
303 int ret;
304
305 switch (a->attr_id) {
306 case attr_reserved_clusters:
307 return reserved_clusters_store(a, sbi, buf, len);
308 case attr_pointer_ui:
309 if (!ptr)
310 return 0;
311 ret = kstrtoul(skip_spaces(buf), 0, &t);
312 if (ret)
313 return ret;
314 *((unsigned int *) ptr) = t;
315 return len;
316 case attr_inode_readahead:
317 return inode_readahead_blks_store(a, sbi, buf, len);
318 case attr_trigger_test_error:
319 return trigger_test_error(a, sbi, buf, len);
320 }
321 return 0;
322}
323
324static void ext4_sb_release(struct kobject *kobj)
325{
326 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
327 s_kobj);
328 complete(&sbi->s_kobj_unregister);
329}
330
331static const struct sysfs_ops ext4_attr_ops = {
332 .show = ext4_attr_show,
333 .store = ext4_attr_store,
334};
335
336static struct kobj_type ext4_sb_ktype = {
337 .default_attrs = ext4_attrs,
338 .sysfs_ops = &ext4_attr_ops,
339 .release = ext4_sb_release,
340};
341
342static struct kobj_type ext4_ktype = {
343 .sysfs_ops = &ext4_attr_ops,
344};
345
346static struct kset ext4_kset = {
347 .kobj = {.ktype = &ext4_ktype},
348};
349
350static struct kobj_type ext4_feat_ktype = {
351 .default_attrs = ext4_feat_attrs,
352 .sysfs_ops = &ext4_attr_ops,
353};
354
355static struct kobject ext4_feat = {
356 .kset = &ext4_kset,
357};
358
359#define PROC_FILE_SHOW_DEFN(name) \
360static int name##_open(struct inode *inode, struct file *file) \
361{ \
362 return single_open(file, ext4_seq_##name##_show, PDE_DATA(inode)); \
363} \
364\
365static const struct file_operations ext4_seq_##name##_fops = { \
366 .open = name##_open, \
367 .read = seq_read, \
368 .llseek = seq_lseek, \
369 .release = single_release, \
370}
371
372#define PROC_FILE_LIST(name) \
373 { __stringify(name), &ext4_seq_##name##_fops }
374
375PROC_FILE_SHOW_DEFN(es_shrinker_info);
376PROC_FILE_SHOW_DEFN(options);
377
378static struct ext4_proc_files {
379 const char *name;
380 const struct file_operations *fops;
381} proc_files[] = {
382 PROC_FILE_LIST(options),
383 PROC_FILE_LIST(es_shrinker_info),
384 PROC_FILE_LIST(mb_groups),
385 { NULL, NULL },
386};
387
388int ext4_register_sysfs(struct super_block *sb)
389{
390 struct ext4_sb_info *sbi = EXT4_SB(sb);
391 struct ext4_proc_files *p;
392 int err;
393
394 sbi->s_kobj.kset = &ext4_kset;
395 init_completion(&sbi->s_kobj_unregister);
396 err = kobject_init_and_add(&sbi->s_kobj, &ext4_sb_ktype, NULL,
397 "%s", sb->s_id);
398 if (err)
399 return err;
400
401 if (ext4_proc_root)
402 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
403
404 if (sbi->s_proc) {
405 for (p = proc_files; p->name; p++)
406 proc_create_data(p->name, S_IRUGO, sbi->s_proc,
407 p->fops, sb);
408 }
409 return 0;
410}
411
412void ext4_unregister_sysfs(struct super_block *sb)
413{
414 struct ext4_sb_info *sbi = EXT4_SB(sb);
415 struct ext4_proc_files *p;
416
417 if (sbi->s_proc) {
418 for (p = proc_files; p->name; p++)
419 remove_proc_entry(p->name, sbi->s_proc);
420 remove_proc_entry(sb->s_id, ext4_proc_root);
421 }
422 kobject_del(&sbi->s_kobj);
423}
424
425int __init ext4_init_sysfs(void)
426{
427 int ret;
428
429 kobject_set_name(&ext4_kset.kobj, "ext4");
430 ext4_kset.kobj.parent = fs_kobj;
431 ret = kset_register(&ext4_kset);
432 if (ret)
433 return ret;
434
435 ret = kobject_init_and_add(&ext4_feat, &ext4_feat_ktype,
436 NULL, "features");
437 if (ret)
438 kset_unregister(&ext4_kset);
439 else
440 ext4_proc_root = proc_mkdir(proc_dirname, NULL);
441 return ret;
442}
443
444void ext4_exit_sysfs(void)
445{
446 kobject_put(&ext4_feat);
447 kset_unregister(&ext4_kset);
448 remove_proc_entry(proc_dirname, NULL);
449 ext4_proc_root = NULL;
450}
451