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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/proc_fs.h>
 15 
 16 #include "ext4.h"
 17 #include "ext4_jbd2.h"
 18 
 19 typedef enum {
 20         attr_noop,
 21         attr_delayed_allocation_blocks,
 22         attr_session_write_kbytes,
 23         attr_lifetime_write_kbytes,
 24         attr_reserved_clusters,
 25         attr_inode_readahead,
 26         attr_trigger_test_error,
 27         attr_feature,
 28         attr_pointer_ui,
 29         attr_pointer_atomic,
 30 } attr_id_t;
 31 
 32 typedef enum {
 33         ptr_explicit,
 34         ptr_ext4_sb_info_offset,
 35         ptr_ext4_super_block_offset,
 36 } attr_ptr_t;
 37 
 38 static const char proc_dirname[] = "fs/ext4";
 39 static struct proc_dir_entry *ext4_proc_root;
 40 
 41 struct ext4_attr {
 42         struct attribute attr;
 43         short attr_id;
 44         short attr_ptr;
 45         union {
 46                 int offset;
 47                 void *explicit_ptr;
 48         } u;
 49 };
 50 
 51 static ssize_t session_write_kbytes_show(struct ext4_attr *a,
 52                                          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_attr *a,
 64                                           struct ext4_sb_info *sbi, char *buf)
 65 {
 66         struct super_block *sb = sbi->s_buddy_cache->i_sb;
 67 
 68         if (!sb->s_bdev->bd_part)
 69                 return snprintf(buf, PAGE_SIZE, "\n");
 70         return snprintf(buf, PAGE_SIZE, "%llu\n",
 71                         (unsigned long long)(sbi->s_kbytes_written +
 72                         ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
 73                           EXT4_SB(sb)->s_sectors_written_start) >> 1)));
 74 }
 75 
 76 static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
 77                                           struct ext4_sb_info *sbi,
 78                                           const char *buf, size_t count)
 79 {
 80         unsigned long t;
 81         int ret;
 82 
 83         ret = kstrtoul(skip_spaces(buf), 0, &t);
 84         if (ret)
 85                 return ret;
 86 
 87         if (t && (!is_power_of_2(t) || t > 0x40000000))
 88                 return -EINVAL;
 89 
 90         sbi->s_inode_readahead_blks = t;
 91         return count;
 92 }
 93 
 94 static ssize_t reserved_clusters_store(struct ext4_attr *a,
 95                                    struct ext4_sb_info *sbi,
 96                                    const char *buf, size_t count)
 97 {
 98         unsigned long long val;
 99         ext4_fsblk_t clusters = (ext4_blocks_count(sbi->s_es) >>
100                                  sbi->s_cluster_bits);
101         int ret;
102 
103         ret = kstrtoull(skip_spaces(buf), 0, &val);
104         if (ret || val >= clusters)
105                 return -EINVAL;
106 
107         atomic64_set(&sbi->s_resv_clusters, val);
108         return count;
109 }
110 
111 static ssize_t trigger_test_error(struct ext4_attr *a,
112                                   struct ext4_sb_info *sbi,
113                                   const char *buf, size_t count)
114 {
115         int len = count;
116 
117         if (!capable(CAP_SYS_ADMIN))
118                 return -EPERM;
119 
120         if (len && buf[len-1] == '\n')
121                 len--;
122 
123         if (len)
124                 ext4_error(sbi->s_sb, "%.*s", len, buf);
125         return count;
126 }
127 
128 #define EXT4_ATTR(_name,_mode,_id)                                      \
129 static struct ext4_attr ext4_attr_##_name = {                           \
130         .attr = {.name = __stringify(_name), .mode = _mode },           \
131         .attr_id = attr_##_id,                                          \
132 }
133 
134 #define EXT4_ATTR_FUNC(_name,_mode)  EXT4_ATTR(_name,_mode,_name)
135 
136 #define EXT4_ATTR_FEATURE(_name)   EXT4_ATTR(_name, 0444, feature)
137 
138 #define EXT4_ATTR_OFFSET(_name,_mode,_id,_struct,_elname)       \
139 static struct ext4_attr ext4_attr_##_name = {                   \
140         .attr = {.name = __stringify(_name), .mode = _mode },   \
141         .attr_id = attr_##_id,                                  \
142         .attr_ptr = ptr_##_struct##_offset,                     \
143         .u = {                                                  \
144                 .offset = offsetof(struct _struct, _elname),\
145         },                                                      \
146 }
147 
148 #define EXT4_RO_ATTR_ES_UI(_name,_elname)                               \
149         EXT4_ATTR_OFFSET(_name, 0444, pointer_ui, ext4_super_block, _elname)
150 
151 #define EXT4_RW_ATTR_SBI_UI(_name,_elname)      \
152         EXT4_ATTR_OFFSET(_name, 0644, pointer_ui, ext4_sb_info, _elname)
153 
154 #define EXT4_ATTR_PTR(_name,_mode,_id,_ptr) \
155 static struct ext4_attr ext4_attr_##_name = {                   \
156         .attr = {.name = __stringify(_name), .mode = _mode },   \
157         .attr_id = attr_##_id,                                  \
158         .attr_ptr = ptr_explicit,                               \
159         .u = {                                                  \
160                 .explicit_ptr = _ptr,                           \
161         },                                                      \
162 }
163 
164 #define ATTR_LIST(name) &ext4_attr_##name.attr
165 
166 EXT4_ATTR_FUNC(delayed_allocation_blocks, 0444);
167 EXT4_ATTR_FUNC(session_write_kbytes, 0444);
168 EXT4_ATTR_FUNC(lifetime_write_kbytes, 0444);
169 EXT4_ATTR_FUNC(reserved_clusters, 0644);
170 
171 EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, inode_readahead,
172                  ext4_sb_info, s_inode_readahead_blks);
173 EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
174 EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
175 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
176 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
177 EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
178 EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
179 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
180 EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb);
181 EXT4_ATTR(trigger_fs_error, 0200, trigger_test_error);
182 EXT4_RW_ATTR_SBI_UI(err_ratelimit_interval_ms, s_err_ratelimit_state.interval);
183 EXT4_RW_ATTR_SBI_UI(err_ratelimit_burst, s_err_ratelimit_state.burst);
184 EXT4_RW_ATTR_SBI_UI(warning_ratelimit_interval_ms, s_warning_ratelimit_state.interval);
185 EXT4_RW_ATTR_SBI_UI(warning_ratelimit_burst, s_warning_ratelimit_state.burst);
186 EXT4_RW_ATTR_SBI_UI(msg_ratelimit_interval_ms, s_msg_ratelimit_state.interval);
187 EXT4_RW_ATTR_SBI_UI(msg_ratelimit_burst, s_msg_ratelimit_state.burst);
188 EXT4_RO_ATTR_ES_UI(errors_count, s_error_count);
189 EXT4_RO_ATTR_ES_UI(first_error_time, s_first_error_time);
190 EXT4_RO_ATTR_ES_UI(last_error_time, s_last_error_time);
191 
192 static unsigned int old_bump_val = 128;
193 EXT4_ATTR_PTR(max_writeback_mb_bump, 0444, pointer_ui, &old_bump_val);
194 
195 static struct attribute *ext4_attrs[] = {
196         ATTR_LIST(delayed_allocation_blocks),
197         ATTR_LIST(session_write_kbytes),
198         ATTR_LIST(lifetime_write_kbytes),
199         ATTR_LIST(reserved_clusters),
200         ATTR_LIST(inode_readahead_blks),
201         ATTR_LIST(inode_goal),
202         ATTR_LIST(mb_stats),
203         ATTR_LIST(mb_max_to_scan),
204         ATTR_LIST(mb_min_to_scan),
205         ATTR_LIST(mb_order2_req),
206         ATTR_LIST(mb_stream_req),
207         ATTR_LIST(mb_group_prealloc),
208         ATTR_LIST(max_writeback_mb_bump),
209         ATTR_LIST(extent_max_zeroout_kb),
210         ATTR_LIST(trigger_fs_error),
211         ATTR_LIST(err_ratelimit_interval_ms),
212         ATTR_LIST(err_ratelimit_burst),
213         ATTR_LIST(warning_ratelimit_interval_ms),
214         ATTR_LIST(warning_ratelimit_burst),
215         ATTR_LIST(msg_ratelimit_interval_ms),
216         ATTR_LIST(msg_ratelimit_burst),
217         ATTR_LIST(errors_count),
218         ATTR_LIST(first_error_time),
219         ATTR_LIST(last_error_time),
220         NULL,
221 };
222 
223 /* Features this copy of ext4 supports */
224 EXT4_ATTR_FEATURE(lazy_itable_init);
225 EXT4_ATTR_FEATURE(batched_discard);
226 EXT4_ATTR_FEATURE(meta_bg_resize);
227 #ifdef CONFIG_EXT4_FS_ENCRYPTION
228 EXT4_ATTR_FEATURE(encryption);
229 #endif
230 EXT4_ATTR_FEATURE(metadata_csum_seed);
231 
232 static struct attribute *ext4_feat_attrs[] = {
233         ATTR_LIST(lazy_itable_init),
234         ATTR_LIST(batched_discard),
235         ATTR_LIST(meta_bg_resize),
236 #ifdef CONFIG_EXT4_FS_ENCRYPTION
237         ATTR_LIST(encryption),
238 #endif
239         ATTR_LIST(metadata_csum_seed),
240         NULL,
241 };
242 
243 static void *calc_ptr(struct ext4_attr *a, struct ext4_sb_info *sbi)
244 {
245         switch (a->attr_ptr) {
246         case ptr_explicit:
247                 return a->u.explicit_ptr;
248         case ptr_ext4_sb_info_offset:
249                 return (void *) (((char *) sbi) + a->u.offset);
250         case ptr_ext4_super_block_offset:
251                 return (void *) (((char *) sbi->s_es) + a->u.offset);
252         }
253         return NULL;
254 }
255 
256 static ssize_t ext4_attr_show(struct kobject *kobj,
257                               struct attribute *attr, char *buf)
258 {
259         struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
260                                                 s_kobj);
261         struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
262         void *ptr = calc_ptr(a, sbi);
263 
264         switch (a->attr_id) {
265         case attr_delayed_allocation_blocks:
266                 return snprintf(buf, PAGE_SIZE, "%llu\n",
267                                 (s64) EXT4_C2B(sbi,
268                        percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
269         case attr_session_write_kbytes:
270                 return session_write_kbytes_show(a, sbi, buf);
271         case attr_lifetime_write_kbytes:
272                 return lifetime_write_kbytes_show(a, sbi, buf);
273         case attr_reserved_clusters:
274                 return snprintf(buf, PAGE_SIZE, "%llu\n",
275                                 (unsigned long long)
276                                 atomic64_read(&sbi->s_resv_clusters));
277         case attr_inode_readahead:
278         case attr_pointer_ui:
279                 if (!ptr)
280                         return 0;
281                 return snprintf(buf, PAGE_SIZE, "%u\n",
282                                 *((unsigned int *) ptr));
283         case attr_pointer_atomic:
284                 if (!ptr)
285                         return 0;
286                 return snprintf(buf, PAGE_SIZE, "%d\n",
287                                 atomic_read((atomic_t *) ptr));
288         case attr_feature:
289                 return snprintf(buf, PAGE_SIZE, "supported\n");
290         }
291 
292         return 0;
293 }
294 
295 static ssize_t ext4_attr_store(struct kobject *kobj,
296                                struct attribute *attr,
297                                const char *buf, size_t len)
298 {
299         struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
300                                                 s_kobj);
301         struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
302         void *ptr = calc_ptr(a, sbi);
303         unsigned long t;
304         int ret;
305 
306         switch (a->attr_id) {
307         case attr_reserved_clusters:
308                 return reserved_clusters_store(a, sbi, buf, len);
309         case attr_pointer_ui:
310                 if (!ptr)
311                         return 0;
312                 ret = kstrtoul(skip_spaces(buf), 0, &t);
313                 if (ret)
314                         return ret;
315                 *((unsigned int *) ptr) = t;
316                 return len;
317         case attr_inode_readahead:
318                 return inode_readahead_blks_store(a, sbi, buf, len);
319         case attr_trigger_test_error:
320                 return trigger_test_error(a, sbi, buf, len);
321         }
322         return 0;
323 }
324 
325 static void ext4_sb_release(struct kobject *kobj)
326 {
327         struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
328                                                 s_kobj);
329         complete(&sbi->s_kobj_unregister);
330 }
331 
332 static const struct sysfs_ops ext4_attr_ops = {
333         .show   = ext4_attr_show,
334         .store  = ext4_attr_store,
335 };
336 
337 static struct kobj_type ext4_sb_ktype = {
338         .default_attrs  = ext4_attrs,
339         .sysfs_ops      = &ext4_attr_ops,
340         .release        = ext4_sb_release,
341 };
342 
343 static struct kobj_type ext4_ktype = {
344         .sysfs_ops      = &ext4_attr_ops,
345 };
346 
347 static struct kset ext4_kset = {
348         .kobj   = {.ktype = &ext4_ktype},
349 };
350 
351 static struct kobj_type ext4_feat_ktype = {
352         .default_attrs  = ext4_feat_attrs,
353         .sysfs_ops      = &ext4_attr_ops,
354 };
355 
356 static struct kobject ext4_feat = {
357         .kset   = &ext4_kset,
358 };
359 
360 #define PROC_FILE_SHOW_DEFN(name) \
361 static int name##_open(struct inode *inode, struct file *file) \
362 { \
363         return single_open(file, ext4_seq_##name##_show, PDE_DATA(inode)); \
364 } \
365 \
366 static const struct file_operations ext4_seq_##name##_fops = { \
367         .open           = name##_open, \
368         .read           = seq_read, \
369         .llseek         = seq_lseek, \
370         .release        = single_release, \
371 }
372 
373 #define PROC_FILE_LIST(name) \
374         { __stringify(name), &ext4_seq_##name##_fops }
375 
376 PROC_FILE_SHOW_DEFN(es_shrinker_info);
377 PROC_FILE_SHOW_DEFN(options);
378 
379 static const struct ext4_proc_files {
380         const char *name;
381         const struct file_operations *fops;
382 } proc_files[] = {
383         PROC_FILE_LIST(options),
384         PROC_FILE_LIST(es_shrinker_info),
385         PROC_FILE_LIST(mb_groups),
386         { NULL, NULL },
387 };
388 
389 int ext4_register_sysfs(struct super_block *sb)
390 {
391         struct ext4_sb_info *sbi = EXT4_SB(sb);
392         const struct ext4_proc_files *p;
393         int err;
394 
395         sbi->s_kobj.kset = &ext4_kset;
396         init_completion(&sbi->s_kobj_unregister);
397         err = kobject_init_and_add(&sbi->s_kobj, &ext4_sb_ktype, NULL,
398                                    "%s", sb->s_id);
399         if (err)
400                 return err;
401 
402         if (ext4_proc_root)
403                 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
404 
405         if (sbi->s_proc) {
406                 for (p = proc_files; p->name; p++)
407                         proc_create_data(p->name, S_IRUGO, sbi->s_proc,
408                                          p->fops, sb);
409         }
410         return 0;
411 }
412 
413 void ext4_unregister_sysfs(struct super_block *sb)
414 {
415         struct ext4_sb_info *sbi = EXT4_SB(sb);
416         const struct ext4_proc_files *p;
417 
418         if (sbi->s_proc) {
419                 for (p = proc_files; p->name; p++)
420                         remove_proc_entry(p->name, sbi->s_proc);
421                 remove_proc_entry(sb->s_id, ext4_proc_root);
422         }
423         kobject_del(&sbi->s_kobj);
424 }
425 
426 int __init ext4_init_sysfs(void)
427 {
428         int ret;
429 
430         kobject_set_name(&ext4_kset.kobj, "ext4");
431         ext4_kset.kobj.parent = fs_kobj;
432         ret = kset_register(&ext4_kset);
433         if (ret)
434                 return ret;
435 
436         ret = kobject_init_and_add(&ext4_feat, &ext4_feat_ktype,
437                                    NULL, "features");
438         if (ret)
439                 kset_unregister(&ext4_kset);
440         else
441                 ext4_proc_root = proc_mkdir(proc_dirname, NULL);
442         return ret;
443 }
444 
445 void ext4_exit_sysfs(void)
446 {
447         kobject_put(&ext4_feat);
448         kset_unregister(&ext4_kset);
449         remove_proc_entry(proc_dirname, NULL);
450         ext4_proc_root = NULL;
451 }
452 
453 

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