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5ac9438619
Patch series "ocfs2: use kobject for online file check", v3. Use embedded kobject mechanism for online file check feature, this will avoid to use a global list to save/search per-device online file check related data. The changed code is based on Goldwyn Rodrigues's patches and ext4 fs code, there is not any new features added, except some very small fixes during this code refactoring. Second, the code change does not affect the underlying file check code. Thank Goldwyn very much. Compare with second version, add more comments in the patch descriptions, to make sure each modification is mentioned. Compare with first version, split the code change into four patches, make sure each patch will not bring ocfs2 kernel modules compiling errors. This patch (of 3): Move some definitions to header file, which will be referenced by other source files when kobject mechanism is introduced. Link: http://lkml.kernel.org/r/1495611866-27360-2-git-send-email-ghe@suse.com Signed-off-by: Gang He <ghe@suse.com> Cc: Mark Fasheh <mark@fasheh.com> Cc: Joel Becker <jlbec@evilplan.org> Cc: Junxiao Bi <junxiao.bi@oracle.com> Cc: Joseph Qi <jiangqi903@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
575 lines
14 KiB
C
575 lines
14 KiB
C
/* -*- mode: c; c-basic-offset: 8; -*-
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* vim: noexpandtab sw=8 ts=8 sts=0:
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*
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* filecheck.c
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*
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* Code which implements online file check.
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*
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* Copyright (C) 2016 SuSE. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*/
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#include <linux/list.h>
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#include <linux/spinlock.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/kmod.h>
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#include <linux/fs.h>
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#include <linux/kobject.h>
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#include <linux/sysfs.h>
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#include <linux/sysctl.h>
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#include <cluster/masklog.h>
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#include "ocfs2.h"
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#include "ocfs2_fs.h"
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#include "stackglue.h"
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#include "inode.h"
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#include "filecheck.h"
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/* File check error strings,
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* must correspond with error number in header file.
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*/
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static const char * const ocfs2_filecheck_errs[] = {
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"SUCCESS",
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"FAILED",
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"INPROGRESS",
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"READONLY",
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"INJBD",
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"INVALIDINO",
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"BLOCKECC",
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"BLOCKNO",
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"VALIDFLAG",
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"GENERATION",
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"UNSUPPORTED"
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};
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static DEFINE_SPINLOCK(ocfs2_filecheck_sysfs_lock);
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static LIST_HEAD(ocfs2_filecheck_sysfs_list);
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struct ocfs2_filecheck_entry {
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struct list_head fe_list;
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unsigned long fe_ino;
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unsigned int fe_type;
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unsigned int fe_done:1;
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unsigned int fe_status:31;
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};
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struct ocfs2_filecheck_args {
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unsigned int fa_type;
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union {
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unsigned long fa_ino;
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unsigned int fa_len;
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};
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};
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static const char *
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ocfs2_filecheck_error(int errno)
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{
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if (!errno)
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return ocfs2_filecheck_errs[errno];
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BUG_ON(errno < OCFS2_FILECHECK_ERR_START ||
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errno > OCFS2_FILECHECK_ERR_END);
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return ocfs2_filecheck_errs[errno - OCFS2_FILECHECK_ERR_START + 1];
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}
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static ssize_t ocfs2_filecheck_show(struct kobject *kobj,
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struct kobj_attribute *attr,
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char *buf);
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static ssize_t ocfs2_filecheck_store(struct kobject *kobj,
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struct kobj_attribute *attr,
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const char *buf, size_t count);
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static struct kobj_attribute ocfs2_attr_filecheck_chk =
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__ATTR(check, S_IRUSR | S_IWUSR,
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ocfs2_filecheck_show,
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ocfs2_filecheck_store);
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static struct kobj_attribute ocfs2_attr_filecheck_fix =
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__ATTR(fix, S_IRUSR | S_IWUSR,
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ocfs2_filecheck_show,
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ocfs2_filecheck_store);
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static struct kobj_attribute ocfs2_attr_filecheck_set =
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__ATTR(set, S_IRUSR | S_IWUSR,
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ocfs2_filecheck_show,
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ocfs2_filecheck_store);
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static void
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ocfs2_filecheck_sysfs_free(struct ocfs2_filecheck_sysfs_entry *entry)
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{
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struct ocfs2_filecheck_entry *p;
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if (!atomic_dec_and_test(&entry->fs_count)) {
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wait_var_event(&entry->fs_count,
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!atomic_read(&entry->fs_count));
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}
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spin_lock(&entry->fs_fcheck->fc_lock);
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while (!list_empty(&entry->fs_fcheck->fc_head)) {
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p = list_first_entry(&entry->fs_fcheck->fc_head,
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struct ocfs2_filecheck_entry, fe_list);
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list_del(&p->fe_list);
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BUG_ON(!p->fe_done); /* To free a undone file check entry */
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kfree(p);
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}
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spin_unlock(&entry->fs_fcheck->fc_lock);
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kset_unregister(entry->fs_fcheckkset);
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kset_unregister(entry->fs_devicekset);
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kfree(entry->fs_fcheck);
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kfree(entry);
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}
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static void
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ocfs2_filecheck_sysfs_add(struct ocfs2_filecheck_sysfs_entry *entry)
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{
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spin_lock(&ocfs2_filecheck_sysfs_lock);
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list_add_tail(&entry->fs_list, &ocfs2_filecheck_sysfs_list);
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spin_unlock(&ocfs2_filecheck_sysfs_lock);
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}
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static int ocfs2_filecheck_sysfs_del(const char *devname)
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{
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struct ocfs2_filecheck_sysfs_entry *p;
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spin_lock(&ocfs2_filecheck_sysfs_lock);
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list_for_each_entry(p, &ocfs2_filecheck_sysfs_list, fs_list) {
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if (!strcmp(p->fs_sb->s_id, devname)) {
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list_del(&p->fs_list);
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spin_unlock(&ocfs2_filecheck_sysfs_lock);
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ocfs2_filecheck_sysfs_free(p);
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return 0;
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}
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}
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spin_unlock(&ocfs2_filecheck_sysfs_lock);
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return 1;
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}
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static void
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ocfs2_filecheck_sysfs_put(struct ocfs2_filecheck_sysfs_entry *entry)
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{
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if (atomic_dec_and_test(&entry->fs_count))
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wake_up_var(&entry->fs_count);
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}
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static struct ocfs2_filecheck_sysfs_entry *
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ocfs2_filecheck_sysfs_get(const char *devname)
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{
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struct ocfs2_filecheck_sysfs_entry *p = NULL;
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spin_lock(&ocfs2_filecheck_sysfs_lock);
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list_for_each_entry(p, &ocfs2_filecheck_sysfs_list, fs_list) {
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if (!strcmp(p->fs_sb->s_id, devname)) {
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atomic_inc(&p->fs_count);
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spin_unlock(&ocfs2_filecheck_sysfs_lock);
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return p;
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}
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}
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spin_unlock(&ocfs2_filecheck_sysfs_lock);
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return NULL;
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}
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int ocfs2_filecheck_create_sysfs(struct super_block *sb)
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{
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int ret = 0;
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struct kset *device_kset = NULL;
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struct kset *fcheck_kset = NULL;
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struct ocfs2_filecheck *fcheck = NULL;
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struct ocfs2_filecheck_sysfs_entry *entry = NULL;
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struct attribute **attrs = NULL;
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struct attribute_group attrgp;
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if (!ocfs2_kset)
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return -ENOMEM;
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attrs = kmalloc(sizeof(struct attribute *) * 4, GFP_NOFS);
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if (!attrs) {
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ret = -ENOMEM;
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goto error;
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} else {
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attrs[0] = &ocfs2_attr_filecheck_chk.attr;
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attrs[1] = &ocfs2_attr_filecheck_fix.attr;
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attrs[2] = &ocfs2_attr_filecheck_set.attr;
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attrs[3] = NULL;
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memset(&attrgp, 0, sizeof(attrgp));
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attrgp.attrs = attrs;
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}
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fcheck = kmalloc(sizeof(struct ocfs2_filecheck), GFP_NOFS);
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if (!fcheck) {
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ret = -ENOMEM;
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goto error;
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} else {
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INIT_LIST_HEAD(&fcheck->fc_head);
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spin_lock_init(&fcheck->fc_lock);
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fcheck->fc_max = OCFS2_FILECHECK_MINSIZE;
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fcheck->fc_size = 0;
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fcheck->fc_done = 0;
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}
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if (strlen(sb->s_id) <= 0) {
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mlog(ML_ERROR,
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"Cannot get device basename when create filecheck sysfs\n");
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ret = -ENODEV;
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goto error;
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}
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device_kset = kset_create_and_add(sb->s_id, NULL, &ocfs2_kset->kobj);
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if (!device_kset) {
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ret = -ENOMEM;
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goto error;
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}
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fcheck_kset = kset_create_and_add("filecheck", NULL,
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&device_kset->kobj);
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if (!fcheck_kset) {
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ret = -ENOMEM;
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goto error;
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}
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ret = sysfs_create_group(&fcheck_kset->kobj, &attrgp);
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if (ret)
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goto error;
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entry = kmalloc(sizeof(struct ocfs2_filecheck_sysfs_entry), GFP_NOFS);
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if (!entry) {
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ret = -ENOMEM;
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goto error;
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} else {
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atomic_set(&entry->fs_count, 1);
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entry->fs_sb = sb;
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entry->fs_devicekset = device_kset;
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entry->fs_fcheckkset = fcheck_kset;
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entry->fs_fcheck = fcheck;
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ocfs2_filecheck_sysfs_add(entry);
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}
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kfree(attrs);
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return 0;
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error:
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kfree(attrs);
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kfree(entry);
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kfree(fcheck);
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kset_unregister(fcheck_kset);
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kset_unregister(device_kset);
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return ret;
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}
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int ocfs2_filecheck_remove_sysfs(struct super_block *sb)
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{
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return ocfs2_filecheck_sysfs_del(sb->s_id);
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}
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static int
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ocfs2_filecheck_erase_entries(struct ocfs2_filecheck_sysfs_entry *ent,
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unsigned int count);
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static int
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ocfs2_filecheck_adjust_max(struct ocfs2_filecheck_sysfs_entry *ent,
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unsigned int len)
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{
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int ret;
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if ((len < OCFS2_FILECHECK_MINSIZE) || (len > OCFS2_FILECHECK_MAXSIZE))
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return -EINVAL;
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spin_lock(&ent->fs_fcheck->fc_lock);
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if (len < (ent->fs_fcheck->fc_size - ent->fs_fcheck->fc_done)) {
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mlog(ML_ERROR,
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"Cannot set online file check maximum entry number "
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"to %u due to too many pending entries(%u)\n",
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len, ent->fs_fcheck->fc_size - ent->fs_fcheck->fc_done);
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ret = -EBUSY;
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} else {
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if (len < ent->fs_fcheck->fc_size)
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BUG_ON(!ocfs2_filecheck_erase_entries(ent,
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ent->fs_fcheck->fc_size - len));
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ent->fs_fcheck->fc_max = len;
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ret = 0;
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}
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spin_unlock(&ent->fs_fcheck->fc_lock);
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return ret;
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}
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#define OCFS2_FILECHECK_ARGS_LEN 24
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static int
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ocfs2_filecheck_args_get_long(const char *buf, size_t count,
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unsigned long *val)
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{
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char buffer[OCFS2_FILECHECK_ARGS_LEN];
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memcpy(buffer, buf, count);
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buffer[count] = '\0';
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if (kstrtoul(buffer, 0, val))
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return 1;
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return 0;
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}
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static int
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ocfs2_filecheck_type_parse(const char *name, unsigned int *type)
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{
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if (!strncmp(name, "fix", 4))
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*type = OCFS2_FILECHECK_TYPE_FIX;
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else if (!strncmp(name, "check", 6))
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*type = OCFS2_FILECHECK_TYPE_CHK;
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else if (!strncmp(name, "set", 4))
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*type = OCFS2_FILECHECK_TYPE_SET;
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else
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return 1;
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return 0;
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}
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static int
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ocfs2_filecheck_args_parse(const char *name, const char *buf, size_t count,
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struct ocfs2_filecheck_args *args)
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{
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unsigned long val = 0;
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unsigned int type;
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/* too short/long args length */
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if ((count < 1) || (count >= OCFS2_FILECHECK_ARGS_LEN))
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return 1;
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if (ocfs2_filecheck_type_parse(name, &type))
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return 1;
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if (ocfs2_filecheck_args_get_long(buf, count, &val))
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return 1;
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if (val <= 0)
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return 1;
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args->fa_type = type;
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if (type == OCFS2_FILECHECK_TYPE_SET)
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args->fa_len = (unsigned int)val;
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else
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args->fa_ino = val;
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return 0;
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}
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static ssize_t ocfs2_filecheck_show(struct kobject *kobj,
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struct kobj_attribute *attr,
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char *buf)
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{
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ssize_t ret = 0, total = 0, remain = PAGE_SIZE;
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unsigned int type;
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struct ocfs2_filecheck_entry *p;
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struct ocfs2_filecheck_sysfs_entry *ent;
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if (ocfs2_filecheck_type_parse(attr->attr.name, &type))
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return -EINVAL;
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ent = ocfs2_filecheck_sysfs_get(kobj->parent->name);
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if (!ent) {
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mlog(ML_ERROR,
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"Cannot get the corresponding entry via device basename %s\n",
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kobj->name);
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return -ENODEV;
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}
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if (type == OCFS2_FILECHECK_TYPE_SET) {
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spin_lock(&ent->fs_fcheck->fc_lock);
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total = snprintf(buf, remain, "%u\n", ent->fs_fcheck->fc_max);
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spin_unlock(&ent->fs_fcheck->fc_lock);
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goto exit;
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}
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ret = snprintf(buf, remain, "INO\t\tDONE\tERROR\n");
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total += ret;
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remain -= ret;
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spin_lock(&ent->fs_fcheck->fc_lock);
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list_for_each_entry(p, &ent->fs_fcheck->fc_head, fe_list) {
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if (p->fe_type != type)
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continue;
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ret = snprintf(buf + total, remain, "%lu\t\t%u\t%s\n",
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p->fe_ino, p->fe_done,
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ocfs2_filecheck_error(p->fe_status));
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if (ret < 0) {
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total = ret;
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break;
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}
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if (ret == remain) {
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/* snprintf() didn't fit */
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total = -E2BIG;
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break;
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}
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total += ret;
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remain -= ret;
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}
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spin_unlock(&ent->fs_fcheck->fc_lock);
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exit:
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ocfs2_filecheck_sysfs_put(ent);
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return total;
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}
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static int
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ocfs2_filecheck_erase_entry(struct ocfs2_filecheck_sysfs_entry *ent)
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{
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struct ocfs2_filecheck_entry *p;
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list_for_each_entry(p, &ent->fs_fcheck->fc_head, fe_list) {
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if (p->fe_done) {
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list_del(&p->fe_list);
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kfree(p);
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ent->fs_fcheck->fc_size--;
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ent->fs_fcheck->fc_done--;
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return 1;
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}
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}
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return 0;
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}
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static int
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ocfs2_filecheck_erase_entries(struct ocfs2_filecheck_sysfs_entry *ent,
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unsigned int count)
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{
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unsigned int i = 0;
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unsigned int ret = 0;
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while (i++ < count) {
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if (ocfs2_filecheck_erase_entry(ent))
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ret++;
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else
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break;
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}
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return (ret == count ? 1 : 0);
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}
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static void
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ocfs2_filecheck_done_entry(struct ocfs2_filecheck_sysfs_entry *ent,
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struct ocfs2_filecheck_entry *entry)
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{
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entry->fe_done = 1;
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spin_lock(&ent->fs_fcheck->fc_lock);
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ent->fs_fcheck->fc_done++;
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spin_unlock(&ent->fs_fcheck->fc_lock);
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}
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static unsigned int
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ocfs2_filecheck_handle(struct super_block *sb,
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unsigned long ino, unsigned int flags)
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{
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unsigned int ret = OCFS2_FILECHECK_ERR_SUCCESS;
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struct inode *inode = NULL;
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int rc;
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inode = ocfs2_iget(OCFS2_SB(sb), ino, flags, 0);
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if (IS_ERR(inode)) {
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rc = (int)(-(long)inode);
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if (rc >= OCFS2_FILECHECK_ERR_START &&
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rc < OCFS2_FILECHECK_ERR_END)
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ret = rc;
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else
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ret = OCFS2_FILECHECK_ERR_FAILED;
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} else
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iput(inode);
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return ret;
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}
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static void
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ocfs2_filecheck_handle_entry(struct ocfs2_filecheck_sysfs_entry *ent,
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struct ocfs2_filecheck_entry *entry)
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{
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if (entry->fe_type == OCFS2_FILECHECK_TYPE_CHK)
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entry->fe_status = ocfs2_filecheck_handle(ent->fs_sb,
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entry->fe_ino, OCFS2_FI_FLAG_FILECHECK_CHK);
|
|
else if (entry->fe_type == OCFS2_FILECHECK_TYPE_FIX)
|
|
entry->fe_status = ocfs2_filecheck_handle(ent->fs_sb,
|
|
entry->fe_ino, OCFS2_FI_FLAG_FILECHECK_FIX);
|
|
else
|
|
entry->fe_status = OCFS2_FILECHECK_ERR_UNSUPPORTED;
|
|
|
|
ocfs2_filecheck_done_entry(ent, entry);
|
|
}
|
|
|
|
static ssize_t ocfs2_filecheck_store(struct kobject *kobj,
|
|
struct kobj_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct ocfs2_filecheck_args args;
|
|
struct ocfs2_filecheck_entry *entry;
|
|
struct ocfs2_filecheck_sysfs_entry *ent;
|
|
ssize_t ret = 0;
|
|
|
|
if (count == 0)
|
|
return count;
|
|
|
|
if (ocfs2_filecheck_args_parse(attr->attr.name, buf, count, &args)) {
|
|
mlog(ML_ERROR, "Invalid arguments for online file check\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
ent = ocfs2_filecheck_sysfs_get(kobj->parent->name);
|
|
if (!ent) {
|
|
mlog(ML_ERROR,
|
|
"Cannot get the corresponding entry via device basename %s\n",
|
|
kobj->parent->name);
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (args.fa_type == OCFS2_FILECHECK_TYPE_SET) {
|
|
ret = ocfs2_filecheck_adjust_max(ent, args.fa_len);
|
|
goto exit;
|
|
}
|
|
|
|
entry = kmalloc(sizeof(struct ocfs2_filecheck_entry), GFP_NOFS);
|
|
if (!entry) {
|
|
ret = -ENOMEM;
|
|
goto exit;
|
|
}
|
|
|
|
spin_lock(&ent->fs_fcheck->fc_lock);
|
|
if ((ent->fs_fcheck->fc_size >= ent->fs_fcheck->fc_max) &&
|
|
(ent->fs_fcheck->fc_done == 0)) {
|
|
mlog(ML_ERROR,
|
|
"Cannot do more file check "
|
|
"since file check queue(%u) is full now\n",
|
|
ent->fs_fcheck->fc_max);
|
|
ret = -EBUSY;
|
|
kfree(entry);
|
|
} else {
|
|
if ((ent->fs_fcheck->fc_size >= ent->fs_fcheck->fc_max) &&
|
|
(ent->fs_fcheck->fc_done > 0)) {
|
|
/* Delete the oldest entry which was done,
|
|
* make sure the entry size in list does
|
|
* not exceed maximum value
|
|
*/
|
|
BUG_ON(!ocfs2_filecheck_erase_entry(ent));
|
|
}
|
|
|
|
entry->fe_ino = args.fa_ino;
|
|
entry->fe_type = args.fa_type;
|
|
entry->fe_done = 0;
|
|
entry->fe_status = OCFS2_FILECHECK_ERR_INPROGRESS;
|
|
list_add_tail(&entry->fe_list, &ent->fs_fcheck->fc_head);
|
|
ent->fs_fcheck->fc_size++;
|
|
}
|
|
spin_unlock(&ent->fs_fcheck->fc_lock);
|
|
|
|
if (!ret)
|
|
ocfs2_filecheck_handle_entry(ent, entry);
|
|
|
|
exit:
|
|
ocfs2_filecheck_sysfs_put(ent);
|
|
return (!ret ? count : ret);
|
|
}
|