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Linux/fs/ext4/sysfs.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  *  linux/fs/ext4/sysfs.c
  4  *
  5  * Copyright (C) 1992, 1993, 1994, 1995
  6  * Remy Card (card@masi.ibp.fr)
  7  * Theodore Ts'o (tytso@mit.edu)
  8  *
  9  */
 10 
 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 
 20 typedef 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_feature,
 29         attr_pointer_ui,
 30         attr_pointer_atomic,
 31 } attr_id_t;
 32 
 33 typedef enum {
 34         ptr_explicit,
 35         ptr_ext4_sb_info_offset,
 36         ptr_ext4_super_block_offset,
 37 } attr_ptr_t;
 38 
 39 static const char proc_dirname[] = "fs/ext4";
 40 static struct proc_dir_entry *ext4_proc_root;
 41 
 42 struct ext4_attr {
 43         struct attribute attr;
 44         short attr_id;
 45         short attr_ptr;
 46         union {
 47                 int offset;
 48                 void *explicit_ptr;
 49         } u;
 50 };
 51 
 52 static ssize_t session_write_kbytes_show(struct ext4_sb_info *sbi, char *buf)
 53 {
 54         struct super_block *sb = sbi->s_buddy_cache->i_sb;
 55 
 56         if (!sb->s_bdev->bd_part)
 57                 return snprintf(buf, PAGE_SIZE, "\n");
 58         return snprintf(buf, PAGE_SIZE, "%lu\n",
 59                         (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
 60                          sbi->s_sectors_written_start) >> 1);
 61 }
 62 
 63 static ssize_t lifetime_write_kbytes_show(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, "\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_sb_info *sbi,
 76                                           const char *buf, size_t count)
 77 {
 78         unsigned long t;
 79         int ret;
 80 
 81         ret = kstrtoul(skip_spaces(buf), 0, &t);
 82         if (ret)
 83                 return ret;
 84 
 85         if (t && (!is_power_of_2(t) || t > 0x40000000))
 86                 return -EINVAL;
 87 
 88         sbi->s_inode_readahead_blks = t;
 89         return count;
 90 }
 91 
 92 static ssize_t reserved_clusters_store(struct ext4_sb_info *sbi,
 93                                    const char *buf, size_t count)
 94 {
 95         unsigned long long val;
 96         ext4_fsblk_t clusters = (ext4_blocks_count(sbi->s_es) >>
 97                                  sbi->s_cluster_bits);
 98         int ret;
 99 
100         ret = kstrtoull(skip_spaces(buf), 0, &val);
101         if (ret || val >= clusters)
102                 return -EINVAL;
103 
104         atomic64_set(&sbi->s_resv_clusters, val);
105         return count;
106 }
107 
108 static ssize_t trigger_test_error(struct ext4_sb_info *sbi,
109                                   const char *buf, size_t count)
110 {
111         int len = count;
112 
113         if (!capable(CAP_SYS_ADMIN))
114                 return -EPERM;
115 
116         if (len && buf[len-1] == '\n')
117                 len--;
118 
119         if (len)
120                 ext4_error(sbi->s_sb, "%.*s", len, buf);
121         return count;
122 }
123 
124 #define EXT4_ATTR(_name,_mode,_id)                                      \
125 static struct ext4_attr ext4_attr_##_name = {                           \
126         .attr = {.name = __stringify(_name), .mode = _mode },           \
127         .attr_id = attr_##_id,                                          \
128 }
129 
130 #define EXT4_ATTR_FUNC(_name,_mode)  EXT4_ATTR(_name,_mode,_name)
131 
132 #define EXT4_ATTR_FEATURE(_name)   EXT4_ATTR(_name, 0444, feature)
133 
134 #define EXT4_ATTR_OFFSET(_name,_mode,_id,_struct,_elname)       \
135 static struct ext4_attr ext4_attr_##_name = {                   \
136         .attr = {.name = __stringify(_name), .mode = _mode },   \
137         .attr_id = attr_##_id,                                  \
138         .attr_ptr = ptr_##_struct##_offset,                     \
139         .u = {                                                  \
140                 .offset = offsetof(struct _struct, _elname),\
141         },                                                      \
142 }
143 
144 #define EXT4_RO_ATTR_ES_UI(_name,_elname)                               \
145         EXT4_ATTR_OFFSET(_name, 0444, pointer_ui, ext4_super_block, _elname)
146 
147 #define EXT4_RW_ATTR_SBI_UI(_name,_elname)      \
148         EXT4_ATTR_OFFSET(_name, 0644, pointer_ui, ext4_sb_info, _elname)
149 
150 #define EXT4_ATTR_PTR(_name,_mode,_id,_ptr) \
151 static struct ext4_attr ext4_attr_##_name = {                   \
152         .attr = {.name = __stringify(_name), .mode = _mode },   \
153         .attr_id = attr_##_id,                                  \
154         .attr_ptr = ptr_explicit,                               \
155         .u = {                                                  \
156                 .explicit_ptr = _ptr,                           \
157         },                                                      \
158 }
159 
160 #define ATTR_LIST(name) &ext4_attr_##name.attr
161 
162 EXT4_ATTR_FUNC(delayed_allocation_blocks, 0444);
163 EXT4_ATTR_FUNC(session_write_kbytes, 0444);
164 EXT4_ATTR_FUNC(lifetime_write_kbytes, 0444);
165 EXT4_ATTR_FUNC(reserved_clusters, 0644);
166 
167 EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, inode_readahead,
168                  ext4_sb_info, s_inode_readahead_blks);
169 EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
170 EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
171 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
172 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
173 EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
174 EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
175 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
176 EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb);
177 EXT4_ATTR(trigger_fs_error, 0200, trigger_test_error);
178 EXT4_RW_ATTR_SBI_UI(err_ratelimit_interval_ms, s_err_ratelimit_state.interval);
179 EXT4_RW_ATTR_SBI_UI(err_ratelimit_burst, s_err_ratelimit_state.burst);
180 EXT4_RW_ATTR_SBI_UI(warning_ratelimit_interval_ms, s_warning_ratelimit_state.interval);
181 EXT4_RW_ATTR_SBI_UI(warning_ratelimit_burst, s_warning_ratelimit_state.burst);
182 EXT4_RW_ATTR_SBI_UI(msg_ratelimit_interval_ms, s_msg_ratelimit_state.interval);
183 EXT4_RW_ATTR_SBI_UI(msg_ratelimit_burst, s_msg_ratelimit_state.burst);
184 EXT4_RO_ATTR_ES_UI(errors_count, s_error_count);
185 EXT4_RO_ATTR_ES_UI(first_error_time, s_first_error_time);
186 EXT4_RO_ATTR_ES_UI(last_error_time, s_last_error_time);
187 
188 static unsigned int old_bump_val = 128;
189 EXT4_ATTR_PTR(max_writeback_mb_bump, 0444, pointer_ui, &old_bump_val);
190 
191 static struct attribute *ext4_attrs[] = {
192         ATTR_LIST(delayed_allocation_blocks),
193         ATTR_LIST(session_write_kbytes),
194         ATTR_LIST(lifetime_write_kbytes),
195         ATTR_LIST(reserved_clusters),
196         ATTR_LIST(inode_readahead_blks),
197         ATTR_LIST(inode_goal),
198         ATTR_LIST(mb_stats),
199         ATTR_LIST(mb_max_to_scan),
200         ATTR_LIST(mb_min_to_scan),
201         ATTR_LIST(mb_order2_req),
202         ATTR_LIST(mb_stream_req),
203         ATTR_LIST(mb_group_prealloc),
204         ATTR_LIST(max_writeback_mb_bump),
205         ATTR_LIST(extent_max_zeroout_kb),
206         ATTR_LIST(trigger_fs_error),
207         ATTR_LIST(err_ratelimit_interval_ms),
208         ATTR_LIST(err_ratelimit_burst),
209         ATTR_LIST(warning_ratelimit_interval_ms),
210         ATTR_LIST(warning_ratelimit_burst),
211         ATTR_LIST(msg_ratelimit_interval_ms),
212         ATTR_LIST(msg_ratelimit_burst),
213         ATTR_LIST(errors_count),
214         ATTR_LIST(first_error_time),
215         ATTR_LIST(last_error_time),
216         NULL,
217 };
218 
219 /* Features this copy of ext4 supports */
220 EXT4_ATTR_FEATURE(lazy_itable_init);
221 EXT4_ATTR_FEATURE(batched_discard);
222 EXT4_ATTR_FEATURE(meta_bg_resize);
223 #ifdef CONFIG_EXT4_FS_ENCRYPTION
224 EXT4_ATTR_FEATURE(encryption);
225 #endif
226 EXT4_ATTR_FEATURE(metadata_csum_seed);
227 
228 static struct attribute *ext4_feat_attrs[] = {
229         ATTR_LIST(lazy_itable_init),
230         ATTR_LIST(batched_discard),
231         ATTR_LIST(meta_bg_resize),
232 #ifdef CONFIG_EXT4_FS_ENCRYPTION
233         ATTR_LIST(encryption),
234 #endif
235         ATTR_LIST(metadata_csum_seed),
236         NULL,
237 };
238 
239 static void *calc_ptr(struct ext4_attr *a, struct ext4_sb_info *sbi)
240 {
241         switch (a->attr_ptr) {
242         case ptr_explicit:
243                 return a->u.explicit_ptr;
244         case ptr_ext4_sb_info_offset:
245                 return (void *) (((char *) sbi) + a->u.offset);
246         case ptr_ext4_super_block_offset:
247                 return (void *) (((char *) sbi->s_es) + a->u.offset);
248         }
249         return NULL;
250 }
251 
252 static ssize_t ext4_attr_show(struct kobject *kobj,
253                               struct attribute *attr, char *buf)
254 {
255         struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
256                                                 s_kobj);
257         struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
258         void *ptr = calc_ptr(a, sbi);
259 
260         switch (a->attr_id) {
261         case attr_delayed_allocation_blocks:
262                 return snprintf(buf, PAGE_SIZE, "%llu\n",
263                                 (s64) EXT4_C2B(sbi,
264                        percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
265         case attr_session_write_kbytes:
266                 return session_write_kbytes_show(sbi, buf);
267         case attr_lifetime_write_kbytes:
268                 return lifetime_write_kbytes_show(sbi, buf);
269         case attr_reserved_clusters:
270                 return snprintf(buf, PAGE_SIZE, "%llu\n",
271                                 (unsigned long long)
272                                 atomic64_read(&sbi->s_resv_clusters));
273         case attr_inode_readahead:
274         case attr_pointer_ui:
275                 if (!ptr)
276                         return 0;
277                 return snprintf(buf, PAGE_SIZE, "%u\n",
278                                 *((unsigned int *) ptr));
279         case attr_pointer_atomic:
280                 if (!ptr)
281                         return 0;
282                 return snprintf(buf, PAGE_SIZE, "%d\n",
283                                 atomic_read((atomic_t *) ptr));
284         case attr_feature:
285                 return snprintf(buf, PAGE_SIZE, "supported\n");
286         }
287 
288         return 0;
289 }
290 
291 static ssize_t ext4_attr_store(struct kobject *kobj,
292                                struct attribute *attr,
293                                const char *buf, size_t len)
294 {
295         struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
296                                                 s_kobj);
297         struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
298         void *ptr = calc_ptr(a, sbi);
299         unsigned long t;
300         int ret;
301 
302         switch (a->attr_id) {
303         case attr_reserved_clusters:
304                 return reserved_clusters_store(sbi, buf, len);
305         case attr_pointer_ui:
306                 if (!ptr)
307                         return 0;
308                 ret = kstrtoul(skip_spaces(buf), 0, &t);
309                 if (ret)
310                         return ret;
311                 *((unsigned int *) ptr) = t;
312                 return len;
313         case attr_inode_readahead:
314                 return inode_readahead_blks_store(sbi, buf, len);
315         case attr_trigger_test_error:
316                 return trigger_test_error(sbi, buf, len);
317         }
318         return 0;
319 }
320 
321 static void ext4_sb_release(struct kobject *kobj)
322 {
323         struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
324                                                 s_kobj);
325         complete(&sbi->s_kobj_unregister);
326 }
327 
328 static const struct sysfs_ops ext4_attr_ops = {
329         .show   = ext4_attr_show,
330         .store  = ext4_attr_store,
331 };
332 
333 static struct kobj_type ext4_sb_ktype = {
334         .default_attrs  = ext4_attrs,
335         .sysfs_ops      = &ext4_attr_ops,
336         .release        = ext4_sb_release,
337 };
338 
339 static struct kobj_type ext4_feat_ktype = {
340         .default_attrs  = ext4_feat_attrs,
341         .sysfs_ops      = &ext4_attr_ops,
342         .release        = (void (*)(struct kobject *))kfree,
343 };
344 
345 static struct kobject *ext4_root;
346 
347 static struct kobject *ext4_feat;
348 
349 #define PROC_FILE_SHOW_DEFN(name) \
350 static int name##_open(struct inode *inode, struct file *file) \
351 { \
352         return single_open(file, ext4_seq_##name##_show, PDE_DATA(inode)); \
353 } \
354 \
355 static const struct file_operations ext4_seq_##name##_fops = { \
356         .open           = name##_open, \
357         .read           = seq_read, \
358         .llseek         = seq_lseek, \
359         .release        = single_release, \
360 }
361 
362 #define PROC_FILE_LIST(name) \
363         { __stringify(name), &ext4_seq_##name##_fops }
364 
365 PROC_FILE_SHOW_DEFN(es_shrinker_info);
366 PROC_FILE_SHOW_DEFN(options);
367 
368 static const struct ext4_proc_files {
369         const char *name;
370         const struct file_operations *fops;
371 } proc_files[] = {
372         PROC_FILE_LIST(options),
373         PROC_FILE_LIST(es_shrinker_info),
374         PROC_FILE_LIST(mb_groups),
375         { NULL, NULL },
376 };
377 
378 int ext4_register_sysfs(struct super_block *sb)
379 {
380         struct ext4_sb_info *sbi = EXT4_SB(sb);
381         const struct ext4_proc_files *p;
382         int err;
383 
384         init_completion(&sbi->s_kobj_unregister);
385         err = kobject_init_and_add(&sbi->s_kobj, &ext4_sb_ktype, ext4_root,
386                                    "%s", sb->s_id);
387         if (err) {
388                 kobject_put(&sbi->s_kobj);
389                 wait_for_completion(&sbi->s_kobj_unregister);
390                 return err;
391         }
392 
393         if (ext4_proc_root)
394                 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
395 
396         if (sbi->s_proc) {
397                 for (p = proc_files; p->name; p++)
398                         proc_create_data(p->name, S_IRUGO, sbi->s_proc,
399                                          p->fops, sb);
400         }
401         return 0;
402 }
403 
404 void ext4_unregister_sysfs(struct super_block *sb)
405 {
406         struct ext4_sb_info *sbi = EXT4_SB(sb);
407         const struct ext4_proc_files *p;
408 
409         if (sbi->s_proc) {
410                 for (p = proc_files; p->name; p++)
411                         remove_proc_entry(p->name, sbi->s_proc);
412                 remove_proc_entry(sb->s_id, ext4_proc_root);
413         }
414         kobject_del(&sbi->s_kobj);
415 }
416 
417 int __init ext4_init_sysfs(void)
418 {
419         int ret;
420 
421         ext4_root = kobject_create_and_add("ext4", fs_kobj);
422         if (!ext4_root)
423                 return -ENOMEM;
424 
425         ext4_feat = kzalloc(sizeof(*ext4_feat), GFP_KERNEL);
426         if (!ext4_feat) {
427                 ret = -ENOMEM;
428                 goto root_err;
429         }
430 
431         ret = kobject_init_and_add(ext4_feat, &ext4_feat_ktype,
432                                    ext4_root, "features");
433         if (ret)
434                 goto feat_err;
435 
436         ext4_proc_root = proc_mkdir(proc_dirname, NULL);
437         return ret;
438 
439 feat_err:
440         kobject_put(ext4_feat);
441         ext4_feat = NULL;
442 root_err:
443         kobject_put(ext4_root);
444         ext4_root = NULL;
445         return ret;
446 }
447 
448 void ext4_exit_sysfs(void)
449 {
450         kobject_put(ext4_feat);
451         ext4_feat = NULL;
452         kobject_put(ext4_root);
453         ext4_root = NULL;
454         remove_proc_entry(proc_dirname, NULL);
455         ext4_proc_root = NULL;
456 }
457 
458 

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