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Linux/fs/ext4/sysfs.c

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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 
 18 typedef 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 
 31 typedef enum {
 32         ptr_explicit,
 33         ptr_ext4_sb_info_offset,
 34         ptr_ext4_super_block_offset,
 35 } attr_ptr_t;
 36 
 37 static const char *proc_dirname = "fs/ext4";
 38 static struct proc_dir_entry *ext4_proc_root;
 39 
 40 struct 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 
 50 static 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, "\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 
 62 static 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, "\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_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 
 93 static 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 
110 static 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)                                      \
128 static 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)       \
138 static 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) \
154 static 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 
165 EXT4_ATTR_FUNC(delayed_allocation_blocks, 0444);
166 EXT4_ATTR_FUNC(session_write_kbytes, 0444);
167 EXT4_ATTR_FUNC(lifetime_write_kbytes, 0444);
168 EXT4_ATTR_FUNC(reserved_clusters, 0644);
169 
170 EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, inode_readahead,
171                  ext4_sb_info, s_inode_readahead_blks);
172 EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
173 EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
174 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
175 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
176 EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
177 EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
178 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
179 EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb);
180 EXT4_ATTR(trigger_fs_error, 0200, trigger_test_error);
181 EXT4_RW_ATTR_SBI_UI(err_ratelimit_interval_ms, s_err_ratelimit_state.interval);
182 EXT4_RW_ATTR_SBI_UI(err_ratelimit_burst, s_err_ratelimit_state.burst);
183 EXT4_RW_ATTR_SBI_UI(warning_ratelimit_interval_ms, s_warning_ratelimit_state.interval);
184 EXT4_RW_ATTR_SBI_UI(warning_ratelimit_burst, s_warning_ratelimit_state.burst);
185 EXT4_RW_ATTR_SBI_UI(msg_ratelimit_interval_ms, s_msg_ratelimit_state.interval);
186 EXT4_RW_ATTR_SBI_UI(msg_ratelimit_burst, s_msg_ratelimit_state.burst);
187 EXT4_RO_ATTR_ES_UI(errors_count, s_error_count);
188 EXT4_RO_ATTR_ES_UI(first_error_time, s_first_error_time);
189 EXT4_RO_ATTR_ES_UI(last_error_time, s_last_error_time);
190 
191 static unsigned int old_bump_val = 128;
192 EXT4_ATTR_PTR(max_writeback_mb_bump, 0444, pointer_ui, &old_bump_val);
193 
194 static 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 */
223 EXT4_ATTR_FEATURE(lazy_itable_init);
224 EXT4_ATTR_FEATURE(batched_discard);
225 EXT4_ATTR_FEATURE(meta_bg_resize);
226 #ifdef CONFIG_EXT4_FS_ENCRYPTION
227 EXT4_ATTR_FEATURE(encryption);
228 #endif
229 EXT4_ATTR_FEATURE(metadata_csum_seed);
230 
231 static 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 
242 static 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 
255 static 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 
294 static 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 
324 static 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 
331 static const struct sysfs_ops ext4_attr_ops = {
332         .show   = ext4_attr_show,
333         .store  = ext4_attr_store,
334 };
335 
336 static struct kobj_type ext4_sb_ktype = {
337         .default_attrs  = ext4_attrs,
338         .sysfs_ops      = &ext4_attr_ops,
339         .release        = ext4_sb_release,
340 };
341 
342 static struct kobj_type ext4_ktype = {
343         .sysfs_ops      = &ext4_attr_ops,
344 };
345 
346 static struct kset ext4_kset = {
347         .kobj   = {.ktype = &ext4_ktype},
348 };
349 
350 static struct kobj_type ext4_feat_ktype = {
351         .default_attrs  = ext4_feat_attrs,
352         .sysfs_ops      = &ext4_attr_ops,
353 };
354 
355 static struct kobject ext4_feat = {
356         .kset   = &ext4_kset,
357 };
358 
359 #define PROC_FILE_SHOW_DEFN(name) \
360 static int name##_open(struct inode *inode, struct file *file) \
361 { \
362         return single_open(file, ext4_seq_##name##_show, PDE_DATA(inode)); \
363 } \
364 \
365 static 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 
375 PROC_FILE_SHOW_DEFN(es_shrinker_info);
376 PROC_FILE_SHOW_DEFN(options);
377 
378 static 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 
388 int 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 
412 void 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 
425 int __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 
444 void 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 
452 

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