nilfs2: add /sys/fs/nilfs2/<device>/superblock group
This patch adds creation of /sys/fs/nilfs2/<device>/superblock group. The superblock group contains attributes that describe superblock's details: (1) sb_write_time - show previous write time of super block in human-readable format. (2) sb_write_time_secs - show previous write time of super block in seconds. (3) sb_write_count - show write count of super block. (4) sb_update_frequency - show/set interval of periodical update of superblock (in seconds). You can set preferable frequency of superblock update by command: echo <value> > /sys/fs/nilfs2/<device>/superblock/sb_update_frequency Signed-off-by: Vyacheslav Dubeyko <Vyacheslav.Dubeyko@hgst.com> Cc: Vyacheslav Dubeyko <slava@dubeyko.com> Cc: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> Cc: Michael L. Semon <mlsemon35@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Vyacheslav Dubeyko
committed by
Linus Torvalds
Linus Torvalds
parent
da7141fb78
commit
caa05d49df
@@ -41,6 +41,202 @@ static struct kset *nilfs_kset;
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count; \
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})
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#define NILFS_DEV_INT_GROUP_OPS(name, parent_name) \
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static ssize_t nilfs_##name##_attr_show(struct kobject *kobj, \
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struct attribute *attr, char *buf) \
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{ \
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struct the_nilfs *nilfs = container_of(kobj->parent, \
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struct the_nilfs, \
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ns_##parent_name##_kobj); \
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struct nilfs_##name##_attr *a = container_of(attr, \
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struct nilfs_##name##_attr, \
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attr); \
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return a->show ? a->show(a, nilfs, buf) : 0; \
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} \
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static ssize_t nilfs_##name##_attr_store(struct kobject *kobj, \
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struct attribute *attr, \
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const char *buf, size_t len) \
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{ \
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struct the_nilfs *nilfs = container_of(kobj->parent, \
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struct the_nilfs, \
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ns_##parent_name##_kobj); \
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struct nilfs_##name##_attr *a = container_of(attr, \
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struct nilfs_##name##_attr, \
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attr); \
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return a->store ? a->store(a, nilfs, buf, len) : 0; \
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} \
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static const struct sysfs_ops nilfs_##name##_attr_ops = { \
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.show = nilfs_##name##_attr_show, \
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.store = nilfs_##name##_attr_store, \
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};
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#define NILFS_DEV_INT_GROUP_TYPE(name, parent_name) \
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static void nilfs_##name##_attr_release(struct kobject *kobj) \
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{ \
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struct nilfs_sysfs_##parent_name##_subgroups *subgroups; \
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struct the_nilfs *nilfs = container_of(kobj->parent, \
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struct the_nilfs, \
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ns_##parent_name##_kobj); \
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subgroups = nilfs->ns_##parent_name##_subgroups; \
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complete(&subgroups->sg_##name##_kobj_unregister); \
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} \
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static struct kobj_type nilfs_##name##_ktype = { \
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.default_attrs = nilfs_##name##_attrs, \
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.sysfs_ops = &nilfs_##name##_attr_ops, \
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.release = nilfs_##name##_attr_release, \
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};
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#define NILFS_DEV_INT_GROUP_FNS(name, parent_name) \
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int nilfs_sysfs_create_##name##_group(struct the_nilfs *nilfs) \
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{ \
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struct kobject *parent; \
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struct kobject *kobj; \
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struct completion *kobj_unregister; \
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struct nilfs_sysfs_##parent_name##_subgroups *subgroups; \
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int err; \
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subgroups = nilfs->ns_##parent_name##_subgroups; \
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kobj = &subgroups->sg_##name##_kobj; \
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kobj_unregister = &subgroups->sg_##name##_kobj_unregister; \
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parent = &nilfs->ns_##parent_name##_kobj; \
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kobj->kset = nilfs_kset; \
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init_completion(kobj_unregister); \
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err = kobject_init_and_add(kobj, &nilfs_##name##_ktype, parent, \
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#name); \
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if (err) \
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return err; \
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return 0; \
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} \
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void nilfs_sysfs_delete_##name##_group(struct the_nilfs *nilfs) \
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{ \
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kobject_del(&nilfs->ns_##parent_name##_subgroups->sg_##name##_kobj); \
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}
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/************************************************************************
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* NILFS superblock attrs *
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************************************************************************/
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static ssize_t
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nilfs_superblock_sb_write_time_show(struct nilfs_superblock_attr *attr,
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struct the_nilfs *nilfs,
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char *buf)
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{
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time_t sbwtime;
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down_read(&nilfs->ns_sem);
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sbwtime = nilfs->ns_sbwtime;
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up_read(&nilfs->ns_sem);
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return NILFS_SHOW_TIME(sbwtime, buf);
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}
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static ssize_t
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nilfs_superblock_sb_write_time_secs_show(struct nilfs_superblock_attr *attr,
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struct the_nilfs *nilfs,
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char *buf)
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{
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time_t sbwtime;
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down_read(&nilfs->ns_sem);
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sbwtime = nilfs->ns_sbwtime;
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up_read(&nilfs->ns_sem);
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return snprintf(buf, PAGE_SIZE, "%llu\n", (unsigned long long)sbwtime);
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}
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static ssize_t
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nilfs_superblock_sb_write_count_show(struct nilfs_superblock_attr *attr,
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struct the_nilfs *nilfs,
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char *buf)
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{
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unsigned sbwcount;
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down_read(&nilfs->ns_sem);
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sbwcount = nilfs->ns_sbwcount;
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up_read(&nilfs->ns_sem);
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return snprintf(buf, PAGE_SIZE, "%u\n", sbwcount);
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}
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static ssize_t
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nilfs_superblock_sb_update_frequency_show(struct nilfs_superblock_attr *attr,
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struct the_nilfs *nilfs,
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char *buf)
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{
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unsigned sb_update_freq;
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down_read(&nilfs->ns_sem);
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sb_update_freq = nilfs->ns_sb_update_freq;
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up_read(&nilfs->ns_sem);
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return snprintf(buf, PAGE_SIZE, "%u\n", sb_update_freq);
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}
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static ssize_t
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nilfs_superblock_sb_update_frequency_store(struct nilfs_superblock_attr *attr,
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struct the_nilfs *nilfs,
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const char *buf, size_t count)
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{
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unsigned val;
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int err;
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err = kstrtouint(skip_spaces(buf), 0, &val);
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if (err) {
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printk(KERN_ERR "NILFS: unable to convert string: err=%d\n",
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err);
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return err;
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}
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if (val < NILFS_SB_FREQ) {
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val = NILFS_SB_FREQ;
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printk(KERN_WARNING "NILFS: superblock update frequency cannot be lesser than 10 seconds\n");
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}
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down_write(&nilfs->ns_sem);
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nilfs->ns_sb_update_freq = val;
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up_write(&nilfs->ns_sem);
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return count;
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}
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static const char sb_readme_str[] =
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"The superblock group contains attributes that describe\n"
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"superblock's details.\n\n"
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"(1) sb_write_time\n\tshow previous write time of super block "
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"in human-readable format.\n\n"
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"(2) sb_write_time_secs\n\tshow previous write time of super block "
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"in seconds.\n\n"
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"(3) sb_write_count\n\tshow write count of super block.\n\n"
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"(4) sb_update_frequency\n"
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"\tshow/set interval of periodical update of superblock (in seconds).\n\n"
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"\tYou can set preferable frequency of superblock update by command:\n\n"
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"\t'echo <val> > /sys/fs/<nilfs>/<dev>/superblock/sb_update_frequency'\n";
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static ssize_t
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nilfs_superblock_README_show(struct nilfs_superblock_attr *attr,
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struct the_nilfs *nilfs, char *buf)
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{
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return snprintf(buf, PAGE_SIZE, sb_readme_str);
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}
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NILFS_SUPERBLOCK_RO_ATTR(sb_write_time);
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NILFS_SUPERBLOCK_RO_ATTR(sb_write_time_secs);
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NILFS_SUPERBLOCK_RO_ATTR(sb_write_count);
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NILFS_SUPERBLOCK_RW_ATTR(sb_update_frequency);
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NILFS_SUPERBLOCK_RO_ATTR(README);
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static struct attribute *nilfs_superblock_attrs[] = {
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NILFS_SUPERBLOCK_ATTR_LIST(sb_write_time),
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NILFS_SUPERBLOCK_ATTR_LIST(sb_write_time_secs),
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NILFS_SUPERBLOCK_ATTR_LIST(sb_write_count),
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NILFS_SUPERBLOCK_ATTR_LIST(sb_update_frequency),
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NILFS_SUPERBLOCK_ATTR_LIST(README),
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NULL,
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};
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NILFS_DEV_INT_GROUP_OPS(superblock, dev);
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NILFS_DEV_INT_GROUP_TYPE(superblock, dev);
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NILFS_DEV_INT_GROUP_FNS(superblock, dev);
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/************************************************************************
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* NILFS device attrs *
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************************************************************************/
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@@ -189,24 +385,44 @@ static struct kobj_type nilfs_dev_ktype = {
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int nilfs_sysfs_create_device_group(struct super_block *sb)
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{
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struct the_nilfs *nilfs = sb->s_fs_info;
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size_t devgrp_size = sizeof(struct nilfs_sysfs_dev_subgroups);
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int err;
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nilfs->ns_dev_subgroups = kzalloc(devgrp_size, GFP_KERNEL);
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if (unlikely(!nilfs->ns_dev_subgroups)) {
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err = -ENOMEM;
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printk(KERN_ERR "NILFS: unable to allocate memory for device group\n");
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goto failed_create_device_group;
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}
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nilfs->ns_dev_kobj.kset = nilfs_kset;
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init_completion(&nilfs->ns_dev_kobj_unregister);
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err = kobject_init_and_add(&nilfs->ns_dev_kobj, &nilfs_dev_ktype, NULL,
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"%s", sb->s_id);
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if (err)
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goto failed_create_device_group;
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goto free_dev_subgroups;
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err = nilfs_sysfs_create_superblock_group(nilfs);
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if (err)
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goto cleanup_dev_kobject;
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return 0;
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cleanup_dev_kobject:
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kobject_del(&nilfs->ns_dev_kobj);
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free_dev_subgroups:
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kfree(nilfs->ns_dev_subgroups);
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failed_create_device_group:
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return err;
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}
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void nilfs_sysfs_delete_device_group(struct the_nilfs *nilfs)
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{
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nilfs_sysfs_delete_superblock_group(nilfs);
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kobject_del(&nilfs->ns_dev_kobj);
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kfree(nilfs->ns_dev_subgroups);
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}
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/************************************************************************
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