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![Masahiro Yamada](/assets/img/avatar_default.png)
__DATE__ and __TIME__ makes the build non-deterministic. Drop the debug message using them. Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
1200 lines
32 KiB
C
1200 lines
32 KiB
C
/*
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* This file is part of UBIFS.
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*
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* Copyright (C) 2006-2008 Nokia Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 51
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* Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Authors: Artem Bityutskiy (Битюцкий Артём)
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* Adrian Hunter
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*/
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/*
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* This file implements UBIFS initialization and VFS superblock operations. Some
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* initialization stuff which is rather large and complex is placed at
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* corresponding subsystems, but most of it is here.
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*/
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#include "ubifs.h"
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#include <linux/math64.h>
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#define INODE_LOCKED_MAX 64
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struct super_block *ubifs_sb;
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static struct inode *inodes_locked_down[INODE_LOCKED_MAX];
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/* shrinker.c */
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/* List of all UBIFS file-system instances */
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struct list_head ubifs_infos;
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/* linux/fs/super.c */
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static int sb_set(struct super_block *sb, void *data)
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{
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dev_t *dev = data;
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sb->s_dev = *dev;
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return 0;
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}
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/**
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* sget - find or create a superblock
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* @type: filesystem type superblock should belong to
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* @test: comparison callback
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* @set: setup callback
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* @data: argument to each of them
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*/
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struct super_block *sget(struct file_system_type *type,
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int (*test)(struct super_block *,void *),
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int (*set)(struct super_block *,void *),
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void *data)
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{
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struct super_block *s = NULL;
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int err;
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s = kzalloc(sizeof(struct super_block), GFP_USER);
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if (!s) {
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err = -ENOMEM;
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return ERR_PTR(err);
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}
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INIT_LIST_HEAD(&s->s_instances);
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INIT_LIST_HEAD(&s->s_inodes);
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s->s_time_gran = 1000000000;
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err = set(s, data);
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if (err) {
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return ERR_PTR(err);
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}
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s->s_type = type;
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strncpy(s->s_id, type->name, sizeof(s->s_id));
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list_add(&s->s_instances, &type->fs_supers);
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return s;
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}
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/**
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* validate_inode - validate inode.
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* @c: UBIFS file-system description object
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* @inode: the inode to validate
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*
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* This is a helper function for 'ubifs_iget()' which validates various fields
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* of a newly built inode to make sure they contain sane values and prevent
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* possible vulnerabilities. Returns zero if the inode is all right and
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* a non-zero error code if not.
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*/
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static int validate_inode(struct ubifs_info *c, const struct inode *inode)
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{
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int err;
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const struct ubifs_inode *ui = ubifs_inode(inode);
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if (inode->i_size > c->max_inode_sz) {
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ubifs_err("inode is too large (%lld)",
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(long long)inode->i_size);
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return 1;
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}
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if (ui->compr_type < 0 || ui->compr_type >= UBIFS_COMPR_TYPES_CNT) {
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ubifs_err("unknown compression type %d", ui->compr_type);
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return 2;
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}
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if (ui->data_len < 0 || ui->data_len > UBIFS_MAX_INO_DATA)
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return 4;
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if (!ubifs_compr_present(ui->compr_type)) {
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ubifs_warn("inode %lu uses '%s' compression, but it was not "
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"compiled in", inode->i_ino,
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ubifs_compr_name(ui->compr_type));
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}
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err = dbg_check_dir_size(c, inode);
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return err;
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}
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struct inode *iget_locked(struct super_block *sb, unsigned long ino)
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{
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struct inode *inode;
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inode = (struct inode *)malloc(sizeof(struct ubifs_inode));
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if (inode) {
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inode->i_ino = ino;
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inode->i_sb = sb;
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list_add(&inode->i_sb_list, &sb->s_inodes);
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inode->i_state = I_LOCK | I_NEW;
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}
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return inode;
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}
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int ubifs_iput(struct inode *inode)
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{
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list_del_init(&inode->i_sb_list);
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free(inode);
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return 0;
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}
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/*
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* Lock (save) inode in inode array for readback after recovery
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*/
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void iput(struct inode *inode)
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{
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int i;
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struct inode *ino;
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/*
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* Search end of list
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*/
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for (i = 0; i < INODE_LOCKED_MAX; i++) {
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if (inodes_locked_down[i] == NULL)
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break;
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}
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if (i >= INODE_LOCKED_MAX) {
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ubifs_err("Error, can't lock (save) more inodes while recovery!!!");
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return;
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}
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/*
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* Allocate and use new inode
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*/
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ino = (struct inode *)malloc(sizeof(struct ubifs_inode));
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memcpy(ino, inode, sizeof(struct ubifs_inode));
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/*
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* Finally save inode in array
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*/
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inodes_locked_down[i] = ino;
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}
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struct inode *ubifs_iget(struct super_block *sb, unsigned long inum)
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{
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int err;
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union ubifs_key key;
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struct ubifs_ino_node *ino;
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struct ubifs_info *c = sb->s_fs_info;
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struct inode *inode;
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struct ubifs_inode *ui;
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int i;
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dbg_gen("inode %lu", inum);
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/*
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* U-Boot special handling of locked down inodes via recovery
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* e.g. ubifs_recover_size()
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*/
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for (i = 0; i < INODE_LOCKED_MAX; i++) {
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/*
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* Exit on last entry (NULL), inode not found in list
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*/
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if (inodes_locked_down[i] == NULL)
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break;
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if (inodes_locked_down[i]->i_ino == inum) {
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/*
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* We found the locked down inode in our array,
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* so just return this pointer instead of creating
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* a new one.
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*/
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return inodes_locked_down[i];
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}
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}
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inode = iget_locked(sb, inum);
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if (!inode)
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return ERR_PTR(-ENOMEM);
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if (!(inode->i_state & I_NEW))
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return inode;
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ui = ubifs_inode(inode);
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ino = kmalloc(UBIFS_MAX_INO_NODE_SZ, GFP_NOFS);
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if (!ino) {
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err = -ENOMEM;
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goto out;
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}
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ino_key_init(c, &key, inode->i_ino);
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err = ubifs_tnc_lookup(c, &key, ino);
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if (err)
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goto out_ino;
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inode->i_flags |= (S_NOCMTIME | S_NOATIME);
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inode->i_nlink = le32_to_cpu(ino->nlink);
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inode->i_uid = le32_to_cpu(ino->uid);
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inode->i_gid = le32_to_cpu(ino->gid);
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inode->i_atime.tv_sec = (int64_t)le64_to_cpu(ino->atime_sec);
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inode->i_atime.tv_nsec = le32_to_cpu(ino->atime_nsec);
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inode->i_mtime.tv_sec = (int64_t)le64_to_cpu(ino->mtime_sec);
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inode->i_mtime.tv_nsec = le32_to_cpu(ino->mtime_nsec);
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inode->i_ctime.tv_sec = (int64_t)le64_to_cpu(ino->ctime_sec);
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inode->i_ctime.tv_nsec = le32_to_cpu(ino->ctime_nsec);
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inode->i_mode = le32_to_cpu(ino->mode);
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inode->i_size = le64_to_cpu(ino->size);
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ui->data_len = le32_to_cpu(ino->data_len);
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ui->flags = le32_to_cpu(ino->flags);
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ui->compr_type = le16_to_cpu(ino->compr_type);
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ui->creat_sqnum = le64_to_cpu(ino->creat_sqnum);
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ui->synced_i_size = ui->ui_size = inode->i_size;
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err = validate_inode(c, inode);
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if (err)
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goto out_invalid;
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if ((inode->i_mode & S_IFMT) == S_IFLNK) {
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if (ui->data_len <= 0 || ui->data_len > UBIFS_MAX_INO_DATA) {
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err = 12;
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goto out_invalid;
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}
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ui->data = kmalloc(ui->data_len + 1, GFP_NOFS);
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if (!ui->data) {
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err = -ENOMEM;
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goto out_ino;
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}
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memcpy(ui->data, ino->data, ui->data_len);
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((char *)ui->data)[ui->data_len] = '\0';
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}
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kfree(ino);
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inode->i_state &= ~(I_LOCK | I_NEW);
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return inode;
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out_invalid:
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ubifs_err("inode %lu validation failed, error %d", inode->i_ino, err);
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dbg_dump_node(c, ino);
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dbg_dump_inode(c, inode);
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err = -EINVAL;
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out_ino:
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kfree(ino);
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out:
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ubifs_err("failed to read inode %lu, error %d", inode->i_ino, err);
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return ERR_PTR(err);
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}
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/**
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* init_constants_early - initialize UBIFS constants.
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* @c: UBIFS file-system description object
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*
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* This function initialize UBIFS constants which do not need the superblock to
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* be read. It also checks that the UBI volume satisfies basic UBIFS
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* requirements. Returns zero in case of success and a negative error code in
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* case of failure.
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*/
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static int init_constants_early(struct ubifs_info *c)
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{
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if (c->vi.corrupted) {
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ubifs_warn("UBI volume is corrupted - read-only mode");
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c->ro_media = 1;
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}
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if (c->di.ro_mode) {
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ubifs_msg("read-only UBI device");
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c->ro_media = 1;
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}
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if (c->vi.vol_type == UBI_STATIC_VOLUME) {
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ubifs_msg("static UBI volume - read-only mode");
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c->ro_media = 1;
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}
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c->leb_cnt = c->vi.size;
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c->leb_size = c->vi.usable_leb_size;
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c->half_leb_size = c->leb_size / 2;
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c->min_io_size = c->di.min_io_size;
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c->min_io_shift = fls(c->min_io_size) - 1;
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if (c->leb_size < UBIFS_MIN_LEB_SZ) {
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ubifs_err("too small LEBs (%d bytes), min. is %d bytes",
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c->leb_size, UBIFS_MIN_LEB_SZ);
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return -EINVAL;
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}
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if (c->leb_cnt < UBIFS_MIN_LEB_CNT) {
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ubifs_err("too few LEBs (%d), min. is %d",
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c->leb_cnt, UBIFS_MIN_LEB_CNT);
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return -EINVAL;
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}
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if (!is_power_of_2(c->min_io_size)) {
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ubifs_err("bad min. I/O size %d", c->min_io_size);
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return -EINVAL;
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}
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/*
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* UBIFS aligns all node to 8-byte boundary, so to make function in
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* io.c simpler, assume minimum I/O unit size to be 8 bytes if it is
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* less than 8.
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*/
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if (c->min_io_size < 8) {
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c->min_io_size = 8;
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c->min_io_shift = 3;
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}
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c->ref_node_alsz = ALIGN(UBIFS_REF_NODE_SZ, c->min_io_size);
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c->mst_node_alsz = ALIGN(UBIFS_MST_NODE_SZ, c->min_io_size);
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/*
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* Initialize node length ranges which are mostly needed for node
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* length validation.
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*/
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c->ranges[UBIFS_PAD_NODE].len = UBIFS_PAD_NODE_SZ;
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c->ranges[UBIFS_SB_NODE].len = UBIFS_SB_NODE_SZ;
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c->ranges[UBIFS_MST_NODE].len = UBIFS_MST_NODE_SZ;
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c->ranges[UBIFS_REF_NODE].len = UBIFS_REF_NODE_SZ;
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c->ranges[UBIFS_TRUN_NODE].len = UBIFS_TRUN_NODE_SZ;
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c->ranges[UBIFS_CS_NODE].len = UBIFS_CS_NODE_SZ;
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c->ranges[UBIFS_INO_NODE].min_len = UBIFS_INO_NODE_SZ;
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c->ranges[UBIFS_INO_NODE].max_len = UBIFS_MAX_INO_NODE_SZ;
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c->ranges[UBIFS_ORPH_NODE].min_len =
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UBIFS_ORPH_NODE_SZ + sizeof(__le64);
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c->ranges[UBIFS_ORPH_NODE].max_len = c->leb_size;
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c->ranges[UBIFS_DENT_NODE].min_len = UBIFS_DENT_NODE_SZ;
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c->ranges[UBIFS_DENT_NODE].max_len = UBIFS_MAX_DENT_NODE_SZ;
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c->ranges[UBIFS_XENT_NODE].min_len = UBIFS_XENT_NODE_SZ;
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c->ranges[UBIFS_XENT_NODE].max_len = UBIFS_MAX_XENT_NODE_SZ;
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c->ranges[UBIFS_DATA_NODE].min_len = UBIFS_DATA_NODE_SZ;
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c->ranges[UBIFS_DATA_NODE].max_len = UBIFS_MAX_DATA_NODE_SZ;
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/*
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* Minimum indexing node size is amended later when superblock is
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* read and the key length is known.
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*/
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c->ranges[UBIFS_IDX_NODE].min_len = UBIFS_IDX_NODE_SZ + UBIFS_BRANCH_SZ;
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/*
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* Maximum indexing node size is amended later when superblock is
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* read and the fanout is known.
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*/
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c->ranges[UBIFS_IDX_NODE].max_len = INT_MAX;
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/*
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* Initialize dead and dark LEB space watermarks. See gc.c for comments
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* about these values.
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*/
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c->dead_wm = ALIGN(MIN_WRITE_SZ, c->min_io_size);
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c->dark_wm = ALIGN(UBIFS_MAX_NODE_SZ, c->min_io_size);
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/*
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* Calculate how many bytes would be wasted at the end of LEB if it was
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* fully filled with data nodes of maximum size. This is used in
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* calculations when reporting free space.
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*/
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c->leb_overhead = c->leb_size % UBIFS_MAX_DATA_NODE_SZ;
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return 0;
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}
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/*
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* init_constants_sb - initialize UBIFS constants.
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* @c: UBIFS file-system description object
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*
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* This is a helper function which initializes various UBIFS constants after
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* the superblock has been read. It also checks various UBIFS parameters and
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* makes sure they are all right. Returns zero in case of success and a
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* negative error code in case of failure.
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*/
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static int init_constants_sb(struct ubifs_info *c)
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{
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int tmp, err;
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long long tmp64;
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c->main_bytes = (long long)c->main_lebs * c->leb_size;
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c->max_znode_sz = sizeof(struct ubifs_znode) +
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c->fanout * sizeof(struct ubifs_zbranch);
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tmp = ubifs_idx_node_sz(c, 1);
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c->ranges[UBIFS_IDX_NODE].min_len = tmp;
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c->min_idx_node_sz = ALIGN(tmp, 8);
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tmp = ubifs_idx_node_sz(c, c->fanout);
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c->ranges[UBIFS_IDX_NODE].max_len = tmp;
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c->max_idx_node_sz = ALIGN(tmp, 8);
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/* Make sure LEB size is large enough to fit full commit */
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tmp = UBIFS_CS_NODE_SZ + UBIFS_REF_NODE_SZ * c->jhead_cnt;
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tmp = ALIGN(tmp, c->min_io_size);
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if (tmp > c->leb_size) {
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dbg_err("too small LEB size %d, at least %d needed",
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c->leb_size, tmp);
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return -EINVAL;
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}
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/*
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* Make sure that the log is large enough to fit reference nodes for
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* all buds plus one reserved LEB.
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*/
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tmp64 = c->max_bud_bytes + c->leb_size - 1;
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c->max_bud_cnt = div_u64(tmp64, c->leb_size);
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tmp = (c->ref_node_alsz * c->max_bud_cnt + c->leb_size - 1);
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tmp /= c->leb_size;
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tmp += 1;
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if (c->log_lebs < tmp) {
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dbg_err("too small log %d LEBs, required min. %d LEBs",
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c->log_lebs, tmp);
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return -EINVAL;
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}
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/*
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* When budgeting we assume worst-case scenarios when the pages are not
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* be compressed and direntries are of the maximum size.
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*
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* Note, data, which may be stored in inodes is budgeted separately, so
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* it is not included into 'c->inode_budget'.
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*/
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c->page_budget = UBIFS_MAX_DATA_NODE_SZ * UBIFS_BLOCKS_PER_PAGE;
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c->inode_budget = UBIFS_INO_NODE_SZ;
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c->dent_budget = UBIFS_MAX_DENT_NODE_SZ;
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/*
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* When the amount of flash space used by buds becomes
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* 'c->max_bud_bytes', UBIFS just blocks all writers and starts commit.
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* The writers are unblocked when the commit is finished. To avoid
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* writers to be blocked UBIFS initiates background commit in advance,
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* when number of bud bytes becomes above the limit defined below.
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*/
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c->bg_bud_bytes = (c->max_bud_bytes * 13) >> 4;
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/*
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* Ensure minimum journal size. All the bytes in the journal heads are
|
|
* considered to be used, when calculating the current journal usage.
|
|
* Consequently, if the journal is too small, UBIFS will treat it as
|
|
* always full.
|
|
*/
|
|
tmp64 = (long long)(c->jhead_cnt + 1) * c->leb_size + 1;
|
|
if (c->bg_bud_bytes < tmp64)
|
|
c->bg_bud_bytes = tmp64;
|
|
if (c->max_bud_bytes < tmp64 + c->leb_size)
|
|
c->max_bud_bytes = tmp64 + c->leb_size;
|
|
|
|
err = ubifs_calc_lpt_geom(c);
|
|
if (err)
|
|
return err;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* init_constants_master - initialize UBIFS constants.
|
|
* @c: UBIFS file-system description object
|
|
*
|
|
* This is a helper function which initializes various UBIFS constants after
|
|
* the master node has been read. It also checks various UBIFS parameters and
|
|
* makes sure they are all right.
|
|
*/
|
|
static void init_constants_master(struct ubifs_info *c)
|
|
{
|
|
long long tmp64;
|
|
|
|
c->min_idx_lebs = ubifs_calc_min_idx_lebs(c);
|
|
|
|
/*
|
|
* Calculate total amount of FS blocks. This number is not used
|
|
* internally because it does not make much sense for UBIFS, but it is
|
|
* necessary to report something for the 'statfs()' call.
|
|
*
|
|
* Subtract the LEB reserved for GC, the LEB which is reserved for
|
|
* deletions, minimum LEBs for the index, and assume only one journal
|
|
* head is available.
|
|
*/
|
|
tmp64 = c->main_lebs - 1 - 1 - MIN_INDEX_LEBS - c->jhead_cnt + 1;
|
|
tmp64 *= (long long)c->leb_size - c->leb_overhead;
|
|
tmp64 = ubifs_reported_space(c, tmp64);
|
|
c->block_cnt = tmp64 >> UBIFS_BLOCK_SHIFT;
|
|
}
|
|
|
|
/**
|
|
* free_orphans - free orphans.
|
|
* @c: UBIFS file-system description object
|
|
*/
|
|
static void free_orphans(struct ubifs_info *c)
|
|
{
|
|
struct ubifs_orphan *orph;
|
|
|
|
while (c->orph_dnext) {
|
|
orph = c->orph_dnext;
|
|
c->orph_dnext = orph->dnext;
|
|
list_del(&orph->list);
|
|
kfree(orph);
|
|
}
|
|
|
|
while (!list_empty(&c->orph_list)) {
|
|
orph = list_entry(c->orph_list.next, struct ubifs_orphan, list);
|
|
list_del(&orph->list);
|
|
kfree(orph);
|
|
dbg_err("orphan list not empty at unmount");
|
|
}
|
|
|
|
vfree(c->orph_buf);
|
|
c->orph_buf = NULL;
|
|
}
|
|
|
|
/**
|
|
* check_volume_empty - check if the UBI volume is empty.
|
|
* @c: UBIFS file-system description object
|
|
*
|
|
* This function checks if the UBIFS volume is empty by looking if its LEBs are
|
|
* mapped or not. The result of checking is stored in the @c->empty variable.
|
|
* Returns zero in case of success and a negative error code in case of
|
|
* failure.
|
|
*/
|
|
static int check_volume_empty(struct ubifs_info *c)
|
|
{
|
|
int lnum, err;
|
|
|
|
c->empty = 1;
|
|
for (lnum = 0; lnum < c->leb_cnt; lnum++) {
|
|
err = ubi_is_mapped(c->ubi, lnum);
|
|
if (unlikely(err < 0))
|
|
return err;
|
|
if (err == 1) {
|
|
c->empty = 0;
|
|
break;
|
|
}
|
|
|
|
cond_resched();
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* mount_ubifs - mount UBIFS file-system.
|
|
* @c: UBIFS file-system description object
|
|
*
|
|
* This function mounts UBIFS file system. Returns zero in case of success and
|
|
* a negative error code in case of failure.
|
|
*
|
|
* Note, the function does not de-allocate resources it it fails half way
|
|
* through, and the caller has to do this instead.
|
|
*/
|
|
static int mount_ubifs(struct ubifs_info *c)
|
|
{
|
|
struct super_block *sb = c->vfs_sb;
|
|
int err, mounted_read_only = (sb->s_flags & MS_RDONLY);
|
|
long long x;
|
|
size_t sz;
|
|
|
|
err = init_constants_early(c);
|
|
if (err)
|
|
return err;
|
|
|
|
err = ubifs_debugging_init(c);
|
|
if (err)
|
|
return err;
|
|
|
|
err = check_volume_empty(c);
|
|
if (err)
|
|
goto out_free;
|
|
|
|
if (c->empty && (mounted_read_only || c->ro_media)) {
|
|
/*
|
|
* This UBI volume is empty, and read-only, or the file system
|
|
* is mounted read-only - we cannot format it.
|
|
*/
|
|
ubifs_err("can't format empty UBI volume: read-only %s",
|
|
c->ro_media ? "UBI volume" : "mount");
|
|
err = -EROFS;
|
|
goto out_free;
|
|
}
|
|
|
|
if (c->ro_media && !mounted_read_only) {
|
|
ubifs_err("cannot mount read-write - read-only media");
|
|
err = -EROFS;
|
|
goto out_free;
|
|
}
|
|
|
|
/*
|
|
* The requirement for the buffer is that it should fit indexing B-tree
|
|
* height amount of integers. We assume the height if the TNC tree will
|
|
* never exceed 64.
|
|
*/
|
|
err = -ENOMEM;
|
|
c->bottom_up_buf = kmalloc(BOTTOM_UP_HEIGHT * sizeof(int), GFP_KERNEL);
|
|
if (!c->bottom_up_buf)
|
|
goto out_free;
|
|
|
|
c->sbuf = vmalloc(c->leb_size);
|
|
if (!c->sbuf)
|
|
goto out_free;
|
|
|
|
/*
|
|
* We have to check all CRCs, even for data nodes, when we mount the FS
|
|
* (specifically, when we are replaying).
|
|
*/
|
|
c->always_chk_crc = 1;
|
|
|
|
err = ubifs_read_superblock(c);
|
|
if (err)
|
|
goto out_free;
|
|
|
|
/*
|
|
* Make sure the compressor which is set as default in the superblock
|
|
* or overridden by mount options is actually compiled in.
|
|
*/
|
|
if (!ubifs_compr_present(c->default_compr)) {
|
|
ubifs_err("'compressor \"%s\" is not compiled in",
|
|
ubifs_compr_name(c->default_compr));
|
|
goto out_free;
|
|
}
|
|
|
|
dbg_failure_mode_registration(c);
|
|
|
|
err = init_constants_sb(c);
|
|
if (err)
|
|
goto out_free;
|
|
|
|
sz = ALIGN(c->max_idx_node_sz, c->min_io_size);
|
|
sz = ALIGN(sz + c->max_idx_node_sz, c->min_io_size);
|
|
c->cbuf = kmalloc(sz, GFP_NOFS);
|
|
if (!c->cbuf) {
|
|
err = -ENOMEM;
|
|
goto out_free;
|
|
}
|
|
|
|
sprintf(c->bgt_name, BGT_NAME_PATTERN, c->vi.ubi_num, c->vi.vol_id);
|
|
|
|
err = ubifs_read_master(c);
|
|
if (err)
|
|
goto out_master;
|
|
|
|
init_constants_master(c);
|
|
|
|
if ((c->mst_node->flags & cpu_to_le32(UBIFS_MST_DIRTY)) != 0) {
|
|
ubifs_msg("recovery needed");
|
|
c->need_recovery = 1;
|
|
}
|
|
|
|
err = ubifs_lpt_init(c, 1, !mounted_read_only);
|
|
if (err)
|
|
goto out_lpt;
|
|
|
|
err = dbg_check_idx_size(c, c->old_idx_sz);
|
|
if (err)
|
|
goto out_lpt;
|
|
|
|
err = ubifs_replay_journal(c);
|
|
if (err)
|
|
goto out_journal;
|
|
|
|
err = ubifs_mount_orphans(c, c->need_recovery, mounted_read_only);
|
|
if (err)
|
|
goto out_orphans;
|
|
|
|
if (c->need_recovery) {
|
|
err = ubifs_recover_size(c);
|
|
if (err)
|
|
goto out_orphans;
|
|
}
|
|
|
|
spin_lock(&ubifs_infos_lock);
|
|
list_add_tail(&c->infos_list, &ubifs_infos);
|
|
spin_unlock(&ubifs_infos_lock);
|
|
|
|
if (c->need_recovery) {
|
|
if (mounted_read_only)
|
|
ubifs_msg("recovery deferred");
|
|
else {
|
|
c->need_recovery = 0;
|
|
ubifs_msg("recovery completed");
|
|
}
|
|
}
|
|
|
|
err = dbg_check_filesystem(c);
|
|
if (err)
|
|
goto out_infos;
|
|
|
|
c->always_chk_crc = 0;
|
|
|
|
ubifs_msg("mounted UBI device %d, volume %d, name \"%s\"",
|
|
c->vi.ubi_num, c->vi.vol_id, c->vi.name);
|
|
if (mounted_read_only)
|
|
ubifs_msg("mounted read-only");
|
|
x = (long long)c->main_lebs * c->leb_size;
|
|
ubifs_msg("file system size: %lld bytes (%lld KiB, %lld MiB, %d "
|
|
"LEBs)", x, x >> 10, x >> 20, c->main_lebs);
|
|
x = (long long)c->log_lebs * c->leb_size + c->max_bud_bytes;
|
|
ubifs_msg("journal size: %lld bytes (%lld KiB, %lld MiB, %d "
|
|
"LEBs)", x, x >> 10, x >> 20, c->log_lebs + c->max_bud_cnt);
|
|
ubifs_msg("media format: w%d/r%d (latest is w%d/r%d)",
|
|
c->fmt_version, c->ro_compat_version,
|
|
UBIFS_FORMAT_VERSION, UBIFS_RO_COMPAT_VERSION);
|
|
ubifs_msg("default compressor: %s", ubifs_compr_name(c->default_compr));
|
|
ubifs_msg("reserved for root: %llu bytes (%llu KiB)",
|
|
c->report_rp_size, c->report_rp_size >> 10);
|
|
|
|
dbg_msg("min. I/O unit size: %d bytes", c->min_io_size);
|
|
dbg_msg("LEB size: %d bytes (%d KiB)",
|
|
c->leb_size, c->leb_size >> 10);
|
|
dbg_msg("data journal heads: %d",
|
|
c->jhead_cnt - NONDATA_JHEADS_CNT);
|
|
dbg_msg("UUID: %02X%02X%02X%02X-%02X%02X"
|
|
"-%02X%02X-%02X%02X-%02X%02X%02X%02X%02X%02X",
|
|
c->uuid[0], c->uuid[1], c->uuid[2], c->uuid[3],
|
|
c->uuid[4], c->uuid[5], c->uuid[6], c->uuid[7],
|
|
c->uuid[8], c->uuid[9], c->uuid[10], c->uuid[11],
|
|
c->uuid[12], c->uuid[13], c->uuid[14], c->uuid[15]);
|
|
dbg_msg("big_lpt %d", c->big_lpt);
|
|
dbg_msg("log LEBs: %d (%d - %d)",
|
|
c->log_lebs, UBIFS_LOG_LNUM, c->log_last);
|
|
dbg_msg("LPT area LEBs: %d (%d - %d)",
|
|
c->lpt_lebs, c->lpt_first, c->lpt_last);
|
|
dbg_msg("orphan area LEBs: %d (%d - %d)",
|
|
c->orph_lebs, c->orph_first, c->orph_last);
|
|
dbg_msg("main area LEBs: %d (%d - %d)",
|
|
c->main_lebs, c->main_first, c->leb_cnt - 1);
|
|
dbg_msg("index LEBs: %d", c->lst.idx_lebs);
|
|
dbg_msg("total index bytes: %lld (%lld KiB, %lld MiB)",
|
|
c->old_idx_sz, c->old_idx_sz >> 10, c->old_idx_sz >> 20);
|
|
dbg_msg("key hash type: %d", c->key_hash_type);
|
|
dbg_msg("tree fanout: %d", c->fanout);
|
|
dbg_msg("reserved GC LEB: %d", c->gc_lnum);
|
|
dbg_msg("first main LEB: %d", c->main_first);
|
|
dbg_msg("max. znode size %d", c->max_znode_sz);
|
|
dbg_msg("max. index node size %d", c->max_idx_node_sz);
|
|
dbg_msg("node sizes: data %zu, inode %zu, dentry %zu",
|
|
UBIFS_DATA_NODE_SZ, UBIFS_INO_NODE_SZ, UBIFS_DENT_NODE_SZ);
|
|
dbg_msg("node sizes: trun %zu, sb %zu, master %zu",
|
|
UBIFS_TRUN_NODE_SZ, UBIFS_SB_NODE_SZ, UBIFS_MST_NODE_SZ);
|
|
dbg_msg("node sizes: ref %zu, cmt. start %zu, orph %zu",
|
|
UBIFS_REF_NODE_SZ, UBIFS_CS_NODE_SZ, UBIFS_ORPH_NODE_SZ);
|
|
dbg_msg("max. node sizes: data %zu, inode %zu dentry %zu",
|
|
UBIFS_MAX_DATA_NODE_SZ, UBIFS_MAX_INO_NODE_SZ,
|
|
UBIFS_MAX_DENT_NODE_SZ);
|
|
dbg_msg("dead watermark: %d", c->dead_wm);
|
|
dbg_msg("dark watermark: %d", c->dark_wm);
|
|
dbg_msg("LEB overhead: %d", c->leb_overhead);
|
|
x = (long long)c->main_lebs * c->dark_wm;
|
|
dbg_msg("max. dark space: %lld (%lld KiB, %lld MiB)",
|
|
x, x >> 10, x >> 20);
|
|
dbg_msg("maximum bud bytes: %lld (%lld KiB, %lld MiB)",
|
|
c->max_bud_bytes, c->max_bud_bytes >> 10,
|
|
c->max_bud_bytes >> 20);
|
|
dbg_msg("BG commit bud bytes: %lld (%lld KiB, %lld MiB)",
|
|
c->bg_bud_bytes, c->bg_bud_bytes >> 10,
|
|
c->bg_bud_bytes >> 20);
|
|
dbg_msg("current bud bytes %lld (%lld KiB, %lld MiB)",
|
|
c->bud_bytes, c->bud_bytes >> 10, c->bud_bytes >> 20);
|
|
dbg_msg("max. seq. number: %llu", c->max_sqnum);
|
|
dbg_msg("commit number: %llu", c->cmt_no);
|
|
|
|
return 0;
|
|
|
|
out_infos:
|
|
spin_lock(&ubifs_infos_lock);
|
|
list_del(&c->infos_list);
|
|
spin_unlock(&ubifs_infos_lock);
|
|
out_orphans:
|
|
free_orphans(c);
|
|
out_journal:
|
|
out_lpt:
|
|
ubifs_lpt_free(c, 0);
|
|
out_master:
|
|
kfree(c->mst_node);
|
|
kfree(c->rcvrd_mst_node);
|
|
if (c->bgt)
|
|
kthread_stop(c->bgt);
|
|
kfree(c->cbuf);
|
|
out_free:
|
|
vfree(c->ileb_buf);
|
|
vfree(c->sbuf);
|
|
kfree(c->bottom_up_buf);
|
|
ubifs_debugging_exit(c);
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* ubifs_umount - un-mount UBIFS file-system.
|
|
* @c: UBIFS file-system description object
|
|
*
|
|
* Note, this function is called to free allocated resourced when un-mounting,
|
|
* as well as free resources when an error occurred while we were half way
|
|
* through mounting (error path cleanup function). So it has to make sure the
|
|
* resource was actually allocated before freeing it.
|
|
*/
|
|
void ubifs_umount(struct ubifs_info *c)
|
|
{
|
|
dbg_gen("un-mounting UBI device %d, volume %d", c->vi.ubi_num,
|
|
c->vi.vol_id);
|
|
|
|
spin_lock(&ubifs_infos_lock);
|
|
list_del(&c->infos_list);
|
|
spin_unlock(&ubifs_infos_lock);
|
|
|
|
if (c->bgt)
|
|
kthread_stop(c->bgt);
|
|
|
|
free_orphans(c);
|
|
ubifs_lpt_free(c, 0);
|
|
|
|
kfree(c->cbuf);
|
|
kfree(c->rcvrd_mst_node);
|
|
kfree(c->mst_node);
|
|
vfree(c->ileb_buf);
|
|
vfree(c->sbuf);
|
|
kfree(c->bottom_up_buf);
|
|
ubifs_debugging_exit(c);
|
|
|
|
/* Finally free U-Boot's global copy of superblock */
|
|
if (ubifs_sb != NULL) {
|
|
free(ubifs_sb->s_fs_info);
|
|
free(ubifs_sb);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* open_ubi - parse UBI device name string and open the UBI device.
|
|
* @name: UBI volume name
|
|
* @mode: UBI volume open mode
|
|
*
|
|
* There are several ways to specify UBI volumes when mounting UBIFS:
|
|
* o ubiX_Y - UBI device number X, volume Y;
|
|
* o ubiY - UBI device number 0, volume Y;
|
|
* o ubiX:NAME - mount UBI device X, volume with name NAME;
|
|
* o ubi:NAME - mount UBI device 0, volume with name NAME.
|
|
*
|
|
* Alternative '!' separator may be used instead of ':' (because some shells
|
|
* like busybox may interpret ':' as an NFS host name separator). This function
|
|
* returns ubi volume object in case of success and a negative error code in
|
|
* case of failure.
|
|
*/
|
|
static struct ubi_volume_desc *open_ubi(const char *name, int mode)
|
|
{
|
|
int dev, vol;
|
|
char *endptr;
|
|
|
|
if (name[0] != 'u' || name[1] != 'b' || name[2] != 'i')
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
/* ubi:NAME method */
|
|
if ((name[3] == ':' || name[3] == '!') && name[4] != '\0')
|
|
return ubi_open_volume_nm(0, name + 4, mode);
|
|
|
|
if (!isdigit(name[3]))
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
dev = simple_strtoul(name + 3, &endptr, 0);
|
|
|
|
/* ubiY method */
|
|
if (*endptr == '\0')
|
|
return ubi_open_volume(0, dev, mode);
|
|
|
|
/* ubiX_Y method */
|
|
if (*endptr == '_' && isdigit(endptr[1])) {
|
|
vol = simple_strtoul(endptr + 1, &endptr, 0);
|
|
if (*endptr != '\0')
|
|
return ERR_PTR(-EINVAL);
|
|
return ubi_open_volume(dev, vol, mode);
|
|
}
|
|
|
|
/* ubiX:NAME method */
|
|
if ((*endptr == ':' || *endptr == '!') && endptr[1] != '\0')
|
|
return ubi_open_volume_nm(dev, ++endptr, mode);
|
|
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
static int ubifs_fill_super(struct super_block *sb, void *data, int silent)
|
|
{
|
|
struct ubi_volume_desc *ubi = sb->s_fs_info;
|
|
struct ubifs_info *c;
|
|
struct inode *root;
|
|
int err;
|
|
|
|
c = kzalloc(sizeof(struct ubifs_info), GFP_KERNEL);
|
|
if (!c)
|
|
return -ENOMEM;
|
|
|
|
spin_lock_init(&c->cnt_lock);
|
|
spin_lock_init(&c->cs_lock);
|
|
spin_lock_init(&c->buds_lock);
|
|
spin_lock_init(&c->space_lock);
|
|
spin_lock_init(&c->orphan_lock);
|
|
init_rwsem(&c->commit_sem);
|
|
mutex_init(&c->lp_mutex);
|
|
mutex_init(&c->tnc_mutex);
|
|
mutex_init(&c->log_mutex);
|
|
mutex_init(&c->mst_mutex);
|
|
mutex_init(&c->umount_mutex);
|
|
init_waitqueue_head(&c->cmt_wq);
|
|
c->buds = RB_ROOT;
|
|
c->old_idx = RB_ROOT;
|
|
c->size_tree = RB_ROOT;
|
|
c->orph_tree = RB_ROOT;
|
|
INIT_LIST_HEAD(&c->infos_list);
|
|
INIT_LIST_HEAD(&c->idx_gc);
|
|
INIT_LIST_HEAD(&c->replay_list);
|
|
INIT_LIST_HEAD(&c->replay_buds);
|
|
INIT_LIST_HEAD(&c->uncat_list);
|
|
INIT_LIST_HEAD(&c->empty_list);
|
|
INIT_LIST_HEAD(&c->freeable_list);
|
|
INIT_LIST_HEAD(&c->frdi_idx_list);
|
|
INIT_LIST_HEAD(&c->unclean_leb_list);
|
|
INIT_LIST_HEAD(&c->old_buds);
|
|
INIT_LIST_HEAD(&c->orph_list);
|
|
INIT_LIST_HEAD(&c->orph_new);
|
|
|
|
c->highest_inum = UBIFS_FIRST_INO;
|
|
c->lhead_lnum = c->ltail_lnum = UBIFS_LOG_LNUM;
|
|
|
|
ubi_get_volume_info(ubi, &c->vi);
|
|
ubi_get_device_info(c->vi.ubi_num, &c->di);
|
|
|
|
/* Re-open the UBI device in read-write mode */
|
|
c->ubi = ubi_open_volume(c->vi.ubi_num, c->vi.vol_id, UBI_READONLY);
|
|
if (IS_ERR(c->ubi)) {
|
|
err = PTR_ERR(c->ubi);
|
|
goto out_free;
|
|
}
|
|
|
|
c->vfs_sb = sb;
|
|
|
|
sb->s_fs_info = c;
|
|
sb->s_magic = UBIFS_SUPER_MAGIC;
|
|
sb->s_blocksize = UBIFS_BLOCK_SIZE;
|
|
sb->s_blocksize_bits = UBIFS_BLOCK_SHIFT;
|
|
sb->s_dev = c->vi.cdev;
|
|
sb->s_maxbytes = c->max_inode_sz = key_max_inode_size(c);
|
|
if (c->max_inode_sz > MAX_LFS_FILESIZE)
|
|
sb->s_maxbytes = c->max_inode_sz = MAX_LFS_FILESIZE;
|
|
|
|
if (c->rw_incompat) {
|
|
ubifs_err("the file-system is not R/W-compatible");
|
|
ubifs_msg("on-flash format version is w%d/r%d, but software "
|
|
"only supports up to version w%d/r%d", c->fmt_version,
|
|
c->ro_compat_version, UBIFS_FORMAT_VERSION,
|
|
UBIFS_RO_COMPAT_VERSION);
|
|
return -EROFS;
|
|
}
|
|
|
|
mutex_lock(&c->umount_mutex);
|
|
err = mount_ubifs(c);
|
|
if (err) {
|
|
ubifs_assert(err < 0);
|
|
goto out_unlock;
|
|
}
|
|
|
|
/* Read the root inode */
|
|
root = ubifs_iget(sb, UBIFS_ROOT_INO);
|
|
if (IS_ERR(root)) {
|
|
err = PTR_ERR(root);
|
|
goto out_umount;
|
|
}
|
|
|
|
sb->s_root = NULL;
|
|
|
|
mutex_unlock(&c->umount_mutex);
|
|
return 0;
|
|
|
|
out_umount:
|
|
ubifs_umount(c);
|
|
out_unlock:
|
|
mutex_unlock(&c->umount_mutex);
|
|
ubi_close_volume(c->ubi);
|
|
out_free:
|
|
kfree(c);
|
|
return err;
|
|
}
|
|
|
|
static int sb_test(struct super_block *sb, void *data)
|
|
{
|
|
dev_t *dev = data;
|
|
|
|
return sb->s_dev == *dev;
|
|
}
|
|
|
|
static int ubifs_get_sb(struct file_system_type *fs_type, int flags,
|
|
const char *name, void *data, struct vfsmount *mnt)
|
|
{
|
|
struct ubi_volume_desc *ubi;
|
|
struct ubi_volume_info vi;
|
|
struct super_block *sb;
|
|
int err;
|
|
|
|
dbg_gen("name %s, flags %#x", name, flags);
|
|
|
|
/*
|
|
* Get UBI device number and volume ID. Mount it read-only so far
|
|
* because this might be a new mount point, and UBI allows only one
|
|
* read-write user at a time.
|
|
*/
|
|
ubi = open_ubi(name, UBI_READONLY);
|
|
if (IS_ERR(ubi)) {
|
|
ubifs_err("cannot open \"%s\", error %d",
|
|
name, (int)PTR_ERR(ubi));
|
|
return PTR_ERR(ubi);
|
|
}
|
|
ubi_get_volume_info(ubi, &vi);
|
|
|
|
dbg_gen("opened ubi%d_%d", vi.ubi_num, vi.vol_id);
|
|
|
|
sb = sget(fs_type, &sb_test, &sb_set, &vi.cdev);
|
|
if (IS_ERR(sb)) {
|
|
err = PTR_ERR(sb);
|
|
goto out_close;
|
|
}
|
|
|
|
if (sb->s_root) {
|
|
/* A new mount point for already mounted UBIFS */
|
|
dbg_gen("this ubi volume is already mounted");
|
|
if ((flags ^ sb->s_flags) & MS_RDONLY) {
|
|
err = -EBUSY;
|
|
goto out_deact;
|
|
}
|
|
} else {
|
|
sb->s_flags = flags;
|
|
/*
|
|
* Pass 'ubi' to 'fill_super()' in sb->s_fs_info where it is
|
|
* replaced by 'c'.
|
|
*/
|
|
sb->s_fs_info = ubi;
|
|
err = ubifs_fill_super(sb, data, flags & MS_SILENT ? 1 : 0);
|
|
if (err)
|
|
goto out_deact;
|
|
/* We do not support atime */
|
|
sb->s_flags |= MS_ACTIVE | MS_NOATIME;
|
|
}
|
|
|
|
/* 'fill_super()' opens ubi again so we must close it here */
|
|
ubi_close_volume(ubi);
|
|
|
|
ubifs_sb = sb;
|
|
return 0;
|
|
|
|
out_deact:
|
|
up_write(&sb->s_umount);
|
|
out_close:
|
|
ubi_close_volume(ubi);
|
|
return err;
|
|
}
|
|
|
|
int __init ubifs_init(void)
|
|
{
|
|
int err;
|
|
|
|
BUILD_BUG_ON(sizeof(struct ubifs_ch) != 24);
|
|
|
|
/* Make sure node sizes are 8-byte aligned */
|
|
BUILD_BUG_ON(UBIFS_CH_SZ & 7);
|
|
BUILD_BUG_ON(UBIFS_INO_NODE_SZ & 7);
|
|
BUILD_BUG_ON(UBIFS_DENT_NODE_SZ & 7);
|
|
BUILD_BUG_ON(UBIFS_XENT_NODE_SZ & 7);
|
|
BUILD_BUG_ON(UBIFS_DATA_NODE_SZ & 7);
|
|
BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ & 7);
|
|
BUILD_BUG_ON(UBIFS_SB_NODE_SZ & 7);
|
|
BUILD_BUG_ON(UBIFS_MST_NODE_SZ & 7);
|
|
BUILD_BUG_ON(UBIFS_REF_NODE_SZ & 7);
|
|
BUILD_BUG_ON(UBIFS_CS_NODE_SZ & 7);
|
|
BUILD_BUG_ON(UBIFS_ORPH_NODE_SZ & 7);
|
|
|
|
BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ & 7);
|
|
BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ & 7);
|
|
BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ & 7);
|
|
BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ & 7);
|
|
BUILD_BUG_ON(UBIFS_MAX_NODE_SZ & 7);
|
|
BUILD_BUG_ON(MIN_WRITE_SZ & 7);
|
|
|
|
/* Check min. node size */
|
|
BUILD_BUG_ON(UBIFS_INO_NODE_SZ < MIN_WRITE_SZ);
|
|
BUILD_BUG_ON(UBIFS_DENT_NODE_SZ < MIN_WRITE_SZ);
|
|
BUILD_BUG_ON(UBIFS_XENT_NODE_SZ < MIN_WRITE_SZ);
|
|
BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ < MIN_WRITE_SZ);
|
|
|
|
BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ > UBIFS_MAX_NODE_SZ);
|
|
BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ > UBIFS_MAX_NODE_SZ);
|
|
BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ > UBIFS_MAX_NODE_SZ);
|
|
BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ > UBIFS_MAX_NODE_SZ);
|
|
|
|
/* Defined node sizes */
|
|
BUILD_BUG_ON(UBIFS_SB_NODE_SZ != 4096);
|
|
BUILD_BUG_ON(UBIFS_MST_NODE_SZ != 512);
|
|
BUILD_BUG_ON(UBIFS_INO_NODE_SZ != 160);
|
|
BUILD_BUG_ON(UBIFS_REF_NODE_SZ != 64);
|
|
|
|
/*
|
|
* We use 2 bit wide bit-fields to store compression type, which should
|
|
* be amended if more compressors are added. The bit-fields are:
|
|
* @compr_type in 'struct ubifs_inode', @default_compr in
|
|
* 'struct ubifs_info' and @compr_type in 'struct ubifs_mount_opts'.
|
|
*/
|
|
BUILD_BUG_ON(UBIFS_COMPR_TYPES_CNT > 4);
|
|
|
|
/*
|
|
* We require that PAGE_CACHE_SIZE is greater-than-or-equal-to
|
|
* UBIFS_BLOCK_SIZE. It is assumed that both are powers of 2.
|
|
*/
|
|
if (PAGE_CACHE_SIZE < UBIFS_BLOCK_SIZE) {
|
|
ubifs_err("VFS page cache size is %u bytes, but UBIFS requires"
|
|
" at least 4096 bytes",
|
|
(unsigned int)PAGE_CACHE_SIZE);
|
|
return -EINVAL;
|
|
}
|
|
|
|
err = -ENOMEM;
|
|
|
|
err = ubifs_compressors_init();
|
|
if (err)
|
|
goto out_shrinker;
|
|
|
|
return 0;
|
|
|
|
out_shrinker:
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* ubifsmount...
|
|
*/
|
|
|
|
static struct file_system_type ubifs_fs_type = {
|
|
.name = "ubifs",
|
|
.owner = THIS_MODULE,
|
|
.get_sb = ubifs_get_sb,
|
|
};
|
|
|
|
int ubifs_mount(char *name)
|
|
{
|
|
int flags;
|
|
void *data;
|
|
struct vfsmount *mnt;
|
|
int ret;
|
|
struct ubifs_info *c;
|
|
|
|
/*
|
|
* First unmount if allready mounted
|
|
*/
|
|
if (ubifs_sb)
|
|
ubifs_umount(ubifs_sb->s_fs_info);
|
|
|
|
INIT_LIST_HEAD(&ubifs_infos);
|
|
INIT_LIST_HEAD(&ubifs_fs_type.fs_supers);
|
|
|
|
/*
|
|
* Mount in read-only mode
|
|
*/
|
|
flags = MS_RDONLY;
|
|
data = NULL;
|
|
mnt = NULL;
|
|
ret = ubifs_get_sb(&ubifs_fs_type, flags, name, data, mnt);
|
|
if (ret) {
|
|
ubifs_err("Error reading superblock on volume '%s' errno=%d!\n", name, ret);
|
|
return -1;
|
|
}
|
|
|
|
c = ubifs_sb->s_fs_info;
|
|
ubi_close_volume(c->ubi);
|
|
|
|
return 0;
|
|
}
|