ext4: notify sysfs on errors_count value change

After s_error_count is incremented, signal the change in the
corresponding sysfs attribute via sysfs_notify. This allows userspace to
poll() on changes to /sys/fs/ext4/*/errors_count.

[ Moved call of ext4_notify_error_sysfs() to flush_stashed_error_work()
  to avoid BUG's caused by calling sysfs_notify trying to sleep after
  being called from an invalid context. -- TYT ]

Signed-off-by: Jonathan Davies <jonathan.davies@nutanix.com>
Link: https://lore.kernel.org/r/20210611140209.28903-1-jonathan.davies@nutanix.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Jonathan Davies 2021-06-11 14:02:08 +00:00 коммит произвёл Theodore Ts'o
Родитель acc6100d3f
Коммит d578b99443
3 изменённых файлов: 8 добавлений и 0 удалений

Просмотреть файл

@ -3624,6 +3624,7 @@ extern const struct inode_operations ext4_symlink_inode_operations;
extern const struct inode_operations ext4_fast_symlink_inode_operations;
/* sysfs.c */
extern void ext4_notify_error_sysfs(struct ext4_sb_info *sbi);
extern int ext4_register_sysfs(struct super_block *sb);
extern void ext4_unregister_sysfs(struct super_block *sb);
extern int __init ext4_init_sysfs(void);

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@ -718,6 +718,7 @@ static void flush_stashed_error_work(struct work_struct *work)
goto write_directly;
}
jbd2_journal_stop(handle);
ext4_notify_error_sysfs(sbi);
return;
}
write_directly:
@ -726,6 +727,7 @@ write_directly:
* out and hope for the best.
*/
ext4_commit_super(sbi->s_sb);
ext4_notify_error_sysfs(sbi);
}
#define ext4_error_ratelimit(sb) \

Просмотреть файл

@ -506,6 +506,11 @@ static struct kobj_type ext4_feat_ktype = {
.release = (void (*)(struct kobject *))kfree,
};
void ext4_notify_error_sysfs(struct ext4_sb_info *sbi)
{
sysfs_notify(&sbi->s_kobj, NULL, "errors_count");
}
static struct kobject *ext4_root;
static struct kobject *ext4_feat;