444 lines
10 KiB
C
444 lines
10 KiB
C
/*
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* linux/fs/ext/inode.c
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*
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* Copyright (C) 1992 Remy Card (card@masi.ibp.fr)
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*
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* from
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*
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* linux/fs/minix/inode.c
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*/
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#include <linux/sched.h>
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#include <linux/ext_fs.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/string.h>
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#include <linux/stat.h>
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#include <linux/locks.h>
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#include <asm/system.h>
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#include <asm/segment.h>
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void ext_put_inode(struct inode *inode)
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{
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if (inode->i_nlink)
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return;
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inode->i_size = 0;
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ext_truncate(inode);
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ext_free_inode(inode);
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}
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void ext_put_super(struct super_block *sb)
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{
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lock_super(sb);
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sb->s_dev = 0;
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if (sb->u.ext_sb.s_firstfreeinodeblock)
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brelse (sb->u.ext_sb.s_firstfreeinodeblock);
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if (sb->u.ext_sb.s_firstfreeblock)
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brelse (sb->u.ext_sb.s_firstfreeblock);
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unlock_super(sb);
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return;
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}
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static struct super_operations ext_sops = {
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ext_read_inode,
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NULL,
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ext_write_inode,
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ext_put_inode,
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ext_put_super,
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ext_write_super,
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ext_statfs,
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NULL
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};
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struct super_block *ext_read_super(struct super_block *s,void *data,
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int silent)
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{
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struct buffer_head *bh;
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struct ext_super_block *es;
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int dev = s->s_dev,block;
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lock_super(s);
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set_blocksize(dev, BLOCK_SIZE);
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if (!(bh = bread(dev, 1, BLOCK_SIZE))) {
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s->s_dev=0;
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unlock_super(s);
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printk("EXT-fs: unable to read superblock\n");
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return NULL;
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}
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es = (struct ext_super_block *) bh->b_data;
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s->s_blocksize = 1024;
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s->s_blocksize_bits = 10;
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s->u.ext_sb.s_ninodes = es->s_ninodes;
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s->u.ext_sb.s_nzones = es->s_nzones;
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s->u.ext_sb.s_firstdatazone = es->s_firstdatazone;
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s->u.ext_sb.s_log_zone_size = es->s_log_zone_size;
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s->u.ext_sb.s_max_size = es->s_max_size;
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s->s_magic = es->s_magic;
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s->u.ext_sb.s_firstfreeblocknumber = es->s_firstfreeblock;
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s->u.ext_sb.s_freeblockscount = es->s_freeblockscount;
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s->u.ext_sb.s_firstfreeinodenumber = es->s_firstfreeinode;
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s->u.ext_sb.s_freeinodescount = es->s_freeinodescount;
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brelse(bh);
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if (s->s_magic != EXT_SUPER_MAGIC) {
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s->s_dev = 0;
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unlock_super(s);
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if (!silent)
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printk("VFS: Can't find an extfs filesystem on dev 0x%04x.\n",
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dev);
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return NULL;
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}
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if (!s->u.ext_sb.s_firstfreeblocknumber)
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s->u.ext_sb.s_firstfreeblock = NULL;
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else
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if (!(s->u.ext_sb.s_firstfreeblock = bread(dev,
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s->u.ext_sb.s_firstfreeblocknumber, BLOCK_SIZE))) {
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printk("ext_read_super: unable to read first free block\n");
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s->s_dev = 0;
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unlock_super(s);
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return NULL;
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}
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if (!s->u.ext_sb.s_firstfreeinodenumber)
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s->u.ext_sb.s_firstfreeinodeblock = NULL;
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else {
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block = 2 + (s->u.ext_sb.s_firstfreeinodenumber - 1) / EXT_INODES_PER_BLOCK;
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if (!(s->u.ext_sb.s_firstfreeinodeblock = bread(dev, block, BLOCK_SIZE))) {
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printk("ext_read_super: unable to read first free inode block\n");
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brelse(s->u.ext_sb.s_firstfreeblock);
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s->s_dev = 0;
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unlock_super (s);
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return NULL;
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}
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}
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unlock_super(s);
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/* set up enough so that it can read an inode */
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s->s_dev = dev;
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s->s_op = &ext_sops;
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if (!(s->s_mounted = iget(s,EXT_ROOT_INO))) {
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s->s_dev=0;
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printk("EXT-fs: get root inode failed\n");
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return NULL;
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}
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return s;
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}
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void ext_write_super (struct super_block *sb)
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{
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struct buffer_head * bh;
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struct ext_super_block * es;
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if (!(bh = bread(sb->s_dev, 1, BLOCK_SIZE))) {
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printk ("ext_write_super: bread failed\n");
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return;
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}
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es = (struct ext_super_block *) bh->b_data;
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es->s_firstfreeblock = sb->u.ext_sb.s_firstfreeblocknumber;
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es->s_freeblockscount = sb->u.ext_sb.s_freeblockscount;
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es->s_firstfreeinode = sb->u.ext_sb.s_firstfreeinodenumber;
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es->s_freeinodescount = sb->u.ext_sb.s_freeinodescount;
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bh->b_dirt = 1;
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brelse (bh);
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sb->s_dirt = 0;
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}
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void ext_statfs (struct super_block *sb, struct statfs *buf)
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{
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long tmp;
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put_fs_long(EXT_SUPER_MAGIC, &buf->f_type);
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put_fs_long(1024, &buf->f_bsize);
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put_fs_long(sb->u.ext_sb.s_nzones << sb->u.ext_sb.s_log_zone_size,
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&buf->f_blocks);
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tmp = ext_count_free_blocks(sb);
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put_fs_long(tmp, &buf->f_bfree);
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put_fs_long(tmp, &buf->f_bavail);
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put_fs_long(sb->u.ext_sb.s_ninodes, &buf->f_files);
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put_fs_long(ext_count_free_inodes(sb), &buf->f_ffree);
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put_fs_long(EXT_NAME_LEN, &buf->f_namelen);
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/* Don't know what value to put in buf->f_fsid */
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}
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#define inode_bmap(inode,nr) ((inode)->u.ext_i.i_data[(nr)])
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static int block_bmap(struct buffer_head * bh, int nr)
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{
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int tmp;
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if (!bh)
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return 0;
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tmp = ((unsigned long *) bh->b_data)[nr];
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brelse(bh);
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return tmp;
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}
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int ext_bmap(struct inode * inode,int block)
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{
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int i;
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if (block<0) {
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printk("ext_bmap: block<0");
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return 0;
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}
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if (block >= 9+256+256*256+256*256*256) {
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printk("ext_bmap: block>big");
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return 0;
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}
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if (block<9)
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return inode_bmap(inode,block);
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block -= 9;
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if (block<256) {
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i = inode_bmap(inode,9);
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if (!i)
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return 0;
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return block_bmap(bread(inode->i_dev,i,BLOCK_SIZE),block);
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}
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block -= 256;
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if (block<256*256) {
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i = inode_bmap(inode,10);
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if (!i)
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return 0;
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i = block_bmap(bread(inode->i_dev,i,BLOCK_SIZE),block>>8);
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if (!i)
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return 0;
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return block_bmap(bread(inode->i_dev,i,BLOCK_SIZE),block & 255);
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}
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block -= 256*256;
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i = inode_bmap(inode,11);
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if (!i)
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return 0;
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i = block_bmap(bread(inode->i_dev,i,BLOCK_SIZE),block>>16);
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if (!i)
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return 0;
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i = block_bmap(bread(inode->i_dev,i,BLOCK_SIZE),(block>>8) & 255);
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if (!i)
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return 0;
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return block_bmap(bread(inode->i_dev,i,BLOCK_SIZE),block & 255);
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}
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static struct buffer_head * inode_getblk(struct inode * inode, int nr, int create)
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{
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int tmp;
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unsigned long * p;
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struct buffer_head * result;
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p = inode->u.ext_i.i_data + nr;
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repeat:
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tmp = *p;
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if (tmp) {
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result = getblk(inode->i_dev, tmp, BLOCK_SIZE);
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if (tmp == *p)
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return result;
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brelse(result);
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goto repeat;
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}
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if (!create)
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return NULL;
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tmp = ext_new_block(inode->i_sb);
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if (!tmp)
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return NULL;
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result = getblk(inode->i_dev, tmp, BLOCK_SIZE);
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if (*p) {
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ext_free_block(inode->i_sb,tmp);
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brelse(result);
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goto repeat;
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}
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*p = tmp;
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inode->i_ctime = CURRENT_TIME;
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inode->i_dirt = 1;
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return result;
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}
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static struct buffer_head * block_getblk(struct inode * inode,
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struct buffer_head * bh, int nr, int create)
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{
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int tmp;
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unsigned long * p;
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struct buffer_head * result;
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if (!bh)
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return NULL;
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if (!bh->b_uptodate) {
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ll_rw_block(READ, 1, &bh);
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wait_on_buffer(bh);
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if (!bh->b_uptodate) {
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brelse(bh);
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return NULL;
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}
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}
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p = nr + (unsigned long *) bh->b_data;
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repeat:
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tmp = *p;
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if (tmp) {
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result = getblk(bh->b_dev, tmp, BLOCK_SIZE);
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if (tmp == *p) {
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brelse(bh);
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return result;
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}
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brelse(result);
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goto repeat;
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}
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if (!create) {
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brelse(bh);
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return NULL;
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}
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tmp = ext_new_block(inode->i_sb);
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if (!tmp) {
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brelse(bh);
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return NULL;
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}
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result = getblk(bh->b_dev, tmp, BLOCK_SIZE);
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if (*p) {
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ext_free_block(inode->i_sb,tmp);
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brelse(result);
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goto repeat;
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}
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*p = tmp;
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bh->b_dirt = 1;
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brelse(bh);
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return result;
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}
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struct buffer_head * ext_getblk(struct inode * inode, int block, int create)
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{
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struct buffer_head * bh;
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if (block<0) {
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printk("ext_getblk: block<0\n");
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return NULL;
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}
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if (block >= 9+256+256*256+256*256*256) {
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printk("ext_getblk: block>big\n");
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return NULL;
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}
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if (block<9)
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return inode_getblk(inode,block,create);
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block -= 9;
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if (block<256) {
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bh = inode_getblk(inode,9,create);
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return block_getblk(inode,bh,block,create);
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}
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block -= 256;
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if (block<256*256) {
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bh = inode_getblk(inode,10,create);
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bh = block_getblk(inode,bh,block>>8,create);
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return block_getblk(inode,bh,block & 255,create);
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}
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block -= 256*256;
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bh = inode_getblk(inode,11,create);
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bh = block_getblk(inode,bh,block>>16,create);
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bh = block_getblk(inode,bh,(block>>8) & 255,create);
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return block_getblk(inode,bh,block & 255,create);
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}
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struct buffer_head * ext_bread(struct inode * inode, int block, int create)
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{
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struct buffer_head * bh;
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bh = ext_getblk(inode,block,create);
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if (!bh || bh->b_uptodate)
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return bh;
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ll_rw_block(READ, 1, &bh);
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wait_on_buffer(bh);
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if (bh->b_uptodate)
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return bh;
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brelse(bh);
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return NULL;
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}
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void ext_read_inode(struct inode * inode)
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{
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struct buffer_head * bh;
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struct ext_inode * raw_inode;
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int block;
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block = 2 + (inode->i_ino-1)/EXT_INODES_PER_BLOCK;
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if (!(bh=bread(inode->i_dev, block, BLOCK_SIZE)))
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panic("unable to read i-node block");
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raw_inode = ((struct ext_inode *) bh->b_data) +
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(inode->i_ino-1)%EXT_INODES_PER_BLOCK;
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inode->i_mode = raw_inode->i_mode;
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inode->i_uid = raw_inode->i_uid;
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inode->i_gid = raw_inode->i_gid;
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inode->i_nlink = raw_inode->i_nlinks;
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inode->i_size = raw_inode->i_size;
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inode->i_mtime = inode->i_atime = inode->i_ctime = raw_inode->i_time;
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inode->i_blocks = inode->i_blksize = 0;
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if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
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inode->i_rdev = raw_inode->i_zone[0];
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else for (block = 0; block < 12; block++)
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inode->u.ext_i.i_data[block] = raw_inode->i_zone[block];
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brelse(bh);
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inode->i_op = NULL;
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if (S_ISREG(inode->i_mode))
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inode->i_op = &ext_file_inode_operations;
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else if (S_ISDIR(inode->i_mode))
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inode->i_op = &ext_dir_inode_operations;
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else if (S_ISLNK(inode->i_mode))
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inode->i_op = &ext_symlink_inode_operations;
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else if (S_ISCHR(inode->i_mode))
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inode->i_op = &chrdev_inode_operations;
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else if (S_ISBLK(inode->i_mode))
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inode->i_op = &blkdev_inode_operations;
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else if (S_ISFIFO(inode->i_mode))
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init_fifo(inode);
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}
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static struct buffer_head * ext_update_inode(struct inode * inode)
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{
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struct buffer_head * bh;
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struct ext_inode * raw_inode;
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int block;
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block = 2 + (inode->i_ino-1)/EXT_INODES_PER_BLOCK;
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if (!(bh=bread(inode->i_dev, block, BLOCK_SIZE)))
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panic("unable to read i-node block");
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raw_inode = ((struct ext_inode *)bh->b_data) +
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(inode->i_ino-1)%EXT_INODES_PER_BLOCK;
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raw_inode->i_mode = inode->i_mode;
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raw_inode->i_uid = inode->i_uid;
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raw_inode->i_gid = inode->i_gid;
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raw_inode->i_nlinks = inode->i_nlink;
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raw_inode->i_size = inode->i_size;
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raw_inode->i_time = inode->i_mtime;
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if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
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raw_inode->i_zone[0] = inode->i_rdev;
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else for (block = 0; block < 12; block++)
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raw_inode->i_zone[block] = inode->u.ext_i.i_data[block];
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bh->b_dirt=1;
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inode->i_dirt=0;
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return bh;
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}
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void ext_write_inode(struct inode * inode)
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{
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struct buffer_head *bh;
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bh = ext_update_inode (inode);
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brelse(bh);
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}
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int ext_sync_inode (struct inode *inode)
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{
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int err = 0;
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struct buffer_head *bh;
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bh = ext_update_inode(inode);
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if (bh && bh->b_dirt)
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{
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ll_rw_block(WRITE, 1, &bh);
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wait_on_buffer(bh);
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if (bh->b_req && !bh->b_uptodate)
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{
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printk ("IO error syncing ext inode [%04x:%08x]\n",
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inode->i_dev, inode->i_ino);
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err = -1;
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}
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}
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else if (!bh)
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err = -1;
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brelse (bh);
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return err;
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}
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