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11#include <linux/time.h>
12#include <linux/fs.h>
13#include <linux/seq_file.h>
14#include <linux/slab.h>
15#include <linux/proc_fs.h>
16
17#include "ext4.h"
18#include "ext4_jbd2.h"
19
20typedef enum {
21 attr_noop,
22 attr_delayed_allocation_blocks,
23 attr_session_write_kbytes,
24 attr_lifetime_write_kbytes,
25 attr_reserved_clusters,
26 attr_inode_readahead,
27 attr_trigger_test_error,
28 attr_first_error_time,
29 attr_last_error_time,
30 attr_feature,
31 attr_pointer_ui,
32 attr_pointer_atomic,
33 attr_journal_task,
34} attr_id_t;
35
36typedef enum {
37 ptr_explicit,
38 ptr_ext4_sb_info_offset,
39 ptr_ext4_super_block_offset,
40} attr_ptr_t;
41
42static const char proc_dirname[] = "fs/ext4";
43static struct proc_dir_entry *ext4_proc_root;
44
45struct ext4_attr {
46 struct attribute attr;
47 short attr_id;
48 short attr_ptr;
49 union {
50 int offset;
51 void *explicit_ptr;
52 } u;
53};
54
55static ssize_t session_write_kbytes_show(struct ext4_sb_info *sbi, char *buf)
56{
57 struct super_block *sb = sbi->s_buddy_cache->i_sb;
58
59 if (!sb->s_bdev->bd_part)
60 return snprintf(buf, PAGE_SIZE, "0\n");
61 return snprintf(buf, PAGE_SIZE, "%lu\n",
62 (part_stat_read(sb->s_bdev->bd_part,
63 sectors[STAT_WRITE]) -
64 sbi->s_sectors_written_start) >> 1);
65}
66
67static ssize_t lifetime_write_kbytes_show(struct ext4_sb_info *sbi, char *buf)
68{
69 struct super_block *sb = sbi->s_buddy_cache->i_sb;
70
71 if (!sb->s_bdev->bd_part)
72 return snprintf(buf, PAGE_SIZE, "0\n");
73 return snprintf(buf, PAGE_SIZE, "%llu\n",
74 (unsigned long long)(sbi->s_kbytes_written +
75 ((part_stat_read(sb->s_bdev->bd_part,
76 sectors[STAT_WRITE]) -
77 EXT4_SB(sb)->s_sectors_written_start) >> 1)));
78}
79
80static ssize_t inode_readahead_blks_store(struct ext4_sb_info *sbi,
81 const char *buf, size_t count)
82{
83 unsigned long t;
84 int ret;
85
86 ret = kstrtoul(skip_spaces(buf), 0, &t);
87 if (ret)
88 return ret;
89
90 if (t && (!is_power_of_2(t) || t > 0x40000000))
91 return -EINVAL;
92
93 sbi->s_inode_readahead_blks = t;
94 return count;
95}
96
97static ssize_t reserved_clusters_store(struct ext4_sb_info *sbi,
98 const char *buf, size_t count)
99{
100 unsigned long long val;
101 ext4_fsblk_t clusters = (ext4_blocks_count(sbi->s_es) >>
102 sbi->s_cluster_bits);
103 int ret;
104
105 ret = kstrtoull(skip_spaces(buf), 0, &val);
106 if (ret || val >= clusters)
107 return -EINVAL;
108
109 atomic64_set(&sbi->s_resv_clusters, val);
110 return count;
111}
112
113static ssize_t trigger_test_error(struct ext4_sb_info *sbi,
114 const char *buf, size_t count)
115{
116 int len = count;
117
118 if (!capable(CAP_SYS_ADMIN))
119 return -EPERM;
120
121 if (len && buf[len-1] == '\n')
122 len--;
123
124 if (len)
125 ext4_error(sbi->s_sb, "%.*s", len, buf);
126 return count;
127}
128
129static ssize_t journal_task_show(struct ext4_sb_info *sbi, char *buf)
130{
131 if (!sbi->s_journal)
132 return snprintf(buf, PAGE_SIZE, "<none>\n");
133 return snprintf(buf, PAGE_SIZE, "%d\n",
134 task_pid_vnr(sbi->s_journal->j_task));
135}
136
137#define EXT4_ATTR(_name,_mode,_id) \
138static struct ext4_attr ext4_attr_##_name = { \
139 .attr = {.name = __stringify(_name), .mode = _mode }, \
140 .attr_id = attr_##_id, \
141}
142
143#define EXT4_ATTR_FUNC(_name,_mode) EXT4_ATTR(_name,_mode,_name)
144
145#define EXT4_ATTR_FEATURE(_name) EXT4_ATTR(_name, 0444, feature)
146
147#define EXT4_ATTR_OFFSET(_name,_mode,_id,_struct,_elname) \
148static struct ext4_attr ext4_attr_##_name = { \
149 .attr = {.name = __stringify(_name), .mode = _mode }, \
150 .attr_id = attr_##_id, \
151 .attr_ptr = ptr_##_struct##_offset, \
152 .u = { \
153 .offset = offsetof(struct _struct, _elname),\
154 }, \
155}
156
157#define EXT4_RO_ATTR_ES_UI(_name,_elname) \
158 EXT4_ATTR_OFFSET(_name, 0444, pointer_ui, ext4_super_block, _elname)
159
160#define EXT4_RW_ATTR_SBI_UI(_name,_elname) \
161 EXT4_ATTR_OFFSET(_name, 0644, pointer_ui, ext4_sb_info, _elname)
162
163#define EXT4_ATTR_PTR(_name,_mode,_id,_ptr) \
164static struct ext4_attr ext4_attr_##_name = { \
165 .attr = {.name = __stringify(_name), .mode = _mode }, \
166 .attr_id = attr_##_id, \
167 .attr_ptr = ptr_explicit, \
168 .u = { \
169 .explicit_ptr = _ptr, \
170 }, \
171}
172
173#define ATTR_LIST(name) &ext4_attr_##name.attr
174
175EXT4_ATTR_FUNC(delayed_allocation_blocks, 0444);
176EXT4_ATTR_FUNC(session_write_kbytes, 0444);
177EXT4_ATTR_FUNC(lifetime_write_kbytes, 0444);
178EXT4_ATTR_FUNC(reserved_clusters, 0644);
179
180EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, inode_readahead,
181 ext4_sb_info, s_inode_readahead_blks);
182EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
183EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
184EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
185EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
186EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
187EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
188EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
189EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb);
190EXT4_ATTR(trigger_fs_error, 0200, trigger_test_error);
191EXT4_RW_ATTR_SBI_UI(err_ratelimit_interval_ms, s_err_ratelimit_state.interval);
192EXT4_RW_ATTR_SBI_UI(err_ratelimit_burst, s_err_ratelimit_state.burst);
193EXT4_RW_ATTR_SBI_UI(warning_ratelimit_interval_ms, s_warning_ratelimit_state.interval);
194EXT4_RW_ATTR_SBI_UI(warning_ratelimit_burst, s_warning_ratelimit_state.burst);
195EXT4_RW_ATTR_SBI_UI(msg_ratelimit_interval_ms, s_msg_ratelimit_state.interval);
196EXT4_RW_ATTR_SBI_UI(msg_ratelimit_burst, s_msg_ratelimit_state.burst);
197EXT4_RO_ATTR_ES_UI(errors_count, s_error_count);
198EXT4_ATTR(first_error_time, 0444, first_error_time);
199EXT4_ATTR(last_error_time, 0444, last_error_time);
200EXT4_ATTR(journal_task, 0444, journal_task);
201
202static unsigned int old_bump_val = 128;
203EXT4_ATTR_PTR(max_writeback_mb_bump, 0444, pointer_ui, &old_bump_val);
204
205static struct attribute *ext4_attrs[] = {
206 ATTR_LIST(delayed_allocation_blocks),
207 ATTR_LIST(session_write_kbytes),
208 ATTR_LIST(lifetime_write_kbytes),
209 ATTR_LIST(reserved_clusters),
210 ATTR_LIST(inode_readahead_blks),
211 ATTR_LIST(inode_goal),
212 ATTR_LIST(mb_stats),
213 ATTR_LIST(mb_max_to_scan),
214 ATTR_LIST(mb_min_to_scan),
215 ATTR_LIST(mb_order2_req),
216 ATTR_LIST(mb_stream_req),
217 ATTR_LIST(mb_group_prealloc),
218 ATTR_LIST(max_writeback_mb_bump),
219 ATTR_LIST(extent_max_zeroout_kb),
220 ATTR_LIST(trigger_fs_error),
221 ATTR_LIST(err_ratelimit_interval_ms),
222 ATTR_LIST(err_ratelimit_burst),
223 ATTR_LIST(warning_ratelimit_interval_ms),
224 ATTR_LIST(warning_ratelimit_burst),
225 ATTR_LIST(msg_ratelimit_interval_ms),
226 ATTR_LIST(msg_ratelimit_burst),
227 ATTR_LIST(errors_count),
228 ATTR_LIST(first_error_time),
229 ATTR_LIST(last_error_time),
230 ATTR_LIST(journal_task),
231 NULL,
232};
233
234
235EXT4_ATTR_FEATURE(lazy_itable_init);
236EXT4_ATTR_FEATURE(batched_discard);
237EXT4_ATTR_FEATURE(meta_bg_resize);
238#ifdef CONFIG_FS_ENCRYPTION
239EXT4_ATTR_FEATURE(encryption);
240#endif
241#ifdef CONFIG_UNICODE
242EXT4_ATTR_FEATURE(casefold);
243#endif
244EXT4_ATTR_FEATURE(metadata_csum_seed);
245
246static struct attribute *ext4_feat_attrs[] = {
247 ATTR_LIST(lazy_itable_init),
248 ATTR_LIST(batched_discard),
249 ATTR_LIST(meta_bg_resize),
250#ifdef CONFIG_FS_ENCRYPTION
251 ATTR_LIST(encryption),
252#endif
253#ifdef CONFIG_UNICODE
254 ATTR_LIST(casefold),
255#endif
256 ATTR_LIST(metadata_csum_seed),
257 NULL,
258};
259
260static void *calc_ptr(struct ext4_attr *a, struct ext4_sb_info *sbi)
261{
262 switch (a->attr_ptr) {
263 case ptr_explicit:
264 return a->u.explicit_ptr;
265 case ptr_ext4_sb_info_offset:
266 return (void *) (((char *) sbi) + a->u.offset);
267 case ptr_ext4_super_block_offset:
268 return (void *) (((char *) sbi->s_es) + a->u.offset);
269 }
270 return NULL;
271}
272
273static ssize_t __print_tstamp(char *buf, __le32 lo, __u8 hi)
274{
275 return snprintf(buf, PAGE_SIZE, "%lld",
276 ((time64_t)hi << 32) + le32_to_cpu(lo));
277}
278
279#define print_tstamp(buf, es, tstamp) \
280 __print_tstamp(buf, (es)->tstamp, (es)->tstamp ## _hi)
281
282static ssize_t ext4_attr_show(struct kobject *kobj,
283 struct attribute *attr, char *buf)
284{
285 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
286 s_kobj);
287 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
288 void *ptr = calc_ptr(a, sbi);
289
290 switch (a->attr_id) {
291 case attr_delayed_allocation_blocks:
292 return snprintf(buf, PAGE_SIZE, "%llu\n",
293 (s64) EXT4_C2B(sbi,
294 percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
295 case attr_session_write_kbytes:
296 return session_write_kbytes_show(sbi, buf);
297 case attr_lifetime_write_kbytes:
298 return lifetime_write_kbytes_show(sbi, buf);
299 case attr_reserved_clusters:
300 return snprintf(buf, PAGE_SIZE, "%llu\n",
301 (unsigned long long)
302 atomic64_read(&sbi->s_resv_clusters));
303 case attr_inode_readahead:
304 case attr_pointer_ui:
305 if (!ptr)
306 return 0;
307 if (a->attr_ptr == ptr_ext4_super_block_offset)
308 return snprintf(buf, PAGE_SIZE, "%u\n",
309 le32_to_cpup(ptr));
310 else
311 return snprintf(buf, PAGE_SIZE, "%u\n",
312 *((unsigned int *) ptr));
313 case attr_pointer_atomic:
314 if (!ptr)
315 return 0;
316 return snprintf(buf, PAGE_SIZE, "%d\n",
317 atomic_read((atomic_t *) ptr));
318 case attr_feature:
319 return snprintf(buf, PAGE_SIZE, "supported\n");
320 case attr_first_error_time:
321 return print_tstamp(buf, sbi->s_es, s_first_error_time);
322 case attr_last_error_time:
323 return print_tstamp(buf, sbi->s_es, s_last_error_time);
324 case attr_journal_task:
325 return journal_task_show(sbi, buf);
326 }
327
328 return 0;
329}
330
331static ssize_t ext4_attr_store(struct kobject *kobj,
332 struct attribute *attr,
333 const char *buf, size_t len)
334{
335 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
336 s_kobj);
337 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
338 void *ptr = calc_ptr(a, sbi);
339 unsigned long t;
340 int ret;
341
342 switch (a->attr_id) {
343 case attr_reserved_clusters:
344 return reserved_clusters_store(sbi, buf, len);
345 case attr_pointer_ui:
346 if (!ptr)
347 return 0;
348 ret = kstrtoul(skip_spaces(buf), 0, &t);
349 if (ret)
350 return ret;
351 if (a->attr_ptr == ptr_ext4_super_block_offset)
352 *((__le32 *) ptr) = cpu_to_le32(t);
353 else
354 *((unsigned int *) ptr) = t;
355 return len;
356 case attr_inode_readahead:
357 return inode_readahead_blks_store(sbi, buf, len);
358 case attr_trigger_test_error:
359 return trigger_test_error(sbi, buf, len);
360 }
361 return 0;
362}
363
364static void ext4_sb_release(struct kobject *kobj)
365{
366 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
367 s_kobj);
368 complete(&sbi->s_kobj_unregister);
369}
370
371static const struct sysfs_ops ext4_attr_ops = {
372 .show = ext4_attr_show,
373 .store = ext4_attr_store,
374};
375
376static struct kobj_type ext4_sb_ktype = {
377 .default_attrs = ext4_attrs,
378 .sysfs_ops = &ext4_attr_ops,
379 .release = ext4_sb_release,
380};
381
382static struct kobj_type ext4_feat_ktype = {
383 .default_attrs = ext4_feat_attrs,
384 .sysfs_ops = &ext4_attr_ops,
385 .release = (void (*)(struct kobject *))kfree,
386};
387
388static struct kobject *ext4_root;
389
390static struct kobject *ext4_feat;
391
392int ext4_register_sysfs(struct super_block *sb)
393{
394 struct ext4_sb_info *sbi = EXT4_SB(sb);
395 int err;
396
397 init_completion(&sbi->s_kobj_unregister);
398 err = kobject_init_and_add(&sbi->s_kobj, &ext4_sb_ktype, ext4_root,
399 "%s", sb->s_id);
400 if (err) {
401 kobject_put(&sbi->s_kobj);
402 wait_for_completion(&sbi->s_kobj_unregister);
403 return err;
404 }
405
406 if (ext4_proc_root)
407 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
408 if (sbi->s_proc) {
409 proc_create_single_data("options", S_IRUGO, sbi->s_proc,
410 ext4_seq_options_show, sb);
411 proc_create_single_data("es_shrinker_info", S_IRUGO,
412 sbi->s_proc, ext4_seq_es_shrinker_info_show,
413 sb);
414 proc_create_seq_data("mb_groups", S_IRUGO, sbi->s_proc,
415 &ext4_mb_seq_groups_ops, sb);
416 }
417 return 0;
418}
419
420void ext4_unregister_sysfs(struct super_block *sb)
421{
422 struct ext4_sb_info *sbi = EXT4_SB(sb);
423
424 if (sbi->s_proc)
425 remove_proc_subtree(sb->s_id, ext4_proc_root);
426 kobject_del(&sbi->s_kobj);
427}
428
429int __init ext4_init_sysfs(void)
430{
431 int ret;
432
433 ext4_root = kobject_create_and_add("ext4", fs_kobj);
434 if (!ext4_root)
435 return -ENOMEM;
436
437 ext4_feat = kzalloc(sizeof(*ext4_feat), GFP_KERNEL);
438 if (!ext4_feat) {
439 ret = -ENOMEM;
440 goto root_err;
441 }
442
443 ret = kobject_init_and_add(ext4_feat, &ext4_feat_ktype,
444 ext4_root, "features");
445 if (ret)
446 goto feat_err;
447
448 ext4_proc_root = proc_mkdir(proc_dirname, NULL);
449 return ret;
450
451feat_err:
452 kobject_put(ext4_feat);
453 ext4_feat = NULL;
454root_err:
455 kobject_put(ext4_root);
456 ext4_root = NULL;
457 return ret;
458}
459
460void ext4_exit_sysfs(void)
461{
462 kobject_put(ext4_feat);
463 ext4_feat = NULL;
464 kobject_put(ext4_root);
465 ext4_root = NULL;
466 remove_proc_entry(proc_dirname, NULL);
467 ext4_proc_root = NULL;
468}
469
470
