| /* |
| * linux/fs/minix/inode.c |
| * |
| * (C) 1991 Linus Torvalds |
| */ |
| |
| #include <linux/string.h> |
| #include <linux/stat.h> |
| #include <linux/sched.h> |
| #include <linux/minix_fs.h> |
| #include <linux/kernel.h> |
| #include <linux/mm.h> |
| #include <asm/system.h> |
| #include <asm/segment.h> |
| |
| int sync_dev(int dev); |
| |
| void minix_put_inode(struct inode *inode) |
| { |
| inode->i_size = 0; |
| minix_truncate(inode); |
| minix_free_inode(inode); |
| } |
| |
| void minix_put_super(struct super_block *sb) |
| { |
| int i; |
| |
| lock_super(sb); |
| sb->s_dev = 0; |
| for(i = 0 ; i < MINIX_I_MAP_SLOTS ; i++) |
| brelse(sb->s_imap[i]); |
| for(i = 0 ; i < MINIX_Z_MAP_SLOTS ; i++) |
| brelse(sb->s_zmap[i]); |
| free_super(sb); |
| return; |
| } |
| |
| static struct super_operations minix_sops = { |
| minix_read_inode, |
| minix_write_inode, |
| minix_put_inode, |
| minix_put_super, |
| NULL, |
| minix_statfs |
| }; |
| |
| struct super_block *minix_read_super(struct super_block *s,void *data) |
| { |
| struct buffer_head *bh; |
| struct minix_super_block *ms; |
| int i,dev=s->s_dev,block; |
| |
| lock_super(s); |
| if (!(bh = bread(dev,1))) { |
| s->s_dev=0; |
| free_super(s); |
| printk("bread failed\n"); |
| return NULL; |
| } |
| ms = (struct minix_super_block *) bh->b_data; |
| s->s_ninodes = ms->s_ninodes; |
| s->s_nzones = ms->s_nzones; |
| s->s_imap_blocks = ms->s_imap_blocks; |
| s->s_zmap_blocks = ms->s_zmap_blocks; |
| s->s_firstdatazone = ms->s_firstdatazone; |
| s->s_log_zone_size = ms->s_log_zone_size; |
| s->s_max_size = ms->s_max_size; |
| s->s_magic = ms->s_magic; |
| brelse(bh); |
| if (s->s_magic != MINIX_SUPER_MAGIC) { |
| s->s_dev = 0; |
| free_super(s); |
| printk("magic match failed\n"); |
| return NULL; |
| } |
| for (i=0;i < MINIX_I_MAP_SLOTS;i++) |
| s->s_imap[i] = NULL; |
| for (i=0;i < MINIX_Z_MAP_SLOTS;i++) |
| s->s_zmap[i] = NULL; |
| block=2; |
| for (i=0 ; i < s->s_imap_blocks ; i++) |
| if (s->s_imap[i]=bread(dev,block)) |
| block++; |
| else |
| break; |
| for (i=0 ; i < s->s_zmap_blocks ; i++) |
| if (s->s_zmap[i]=bread(dev,block)) |
| block++; |
| else |
| break; |
| if (block != 2+s->s_imap_blocks+s->s_zmap_blocks) { |
| for(i=0;i<MINIX_I_MAP_SLOTS;i++) |
| brelse(s->s_imap[i]); |
| for(i=0;i<MINIX_Z_MAP_SLOTS;i++) |
| brelse(s->s_zmap[i]); |
| s->s_dev=0; |
| free_super(s); |
| printk("block failed\n"); |
| return NULL; |
| } |
| s->s_imap[0]->b_data[0] |= 1; |
| s->s_zmap[0]->b_data[0] |= 1; |
| free_super(s); |
| /* set up enough so that it can read an inode */ |
| s->s_dev = dev; |
| s->s_op = &minix_sops; |
| if (!(s->s_mounted = iget(dev,MINIX_ROOT_INO))) { |
| s->s_dev=0; |
| printk("get root inode failed\n"); |
| return NULL; |
| } |
| return s; |
| } |
| |
| void minix_statfs (struct super_block *sb, struct statfs *buf) |
| { |
| long tmp; |
| |
| put_fs_long(MINIX_SUPER_MAGIC, &buf->f_type); |
| put_fs_long(1024, &buf->f_bsize); |
| put_fs_long(sb->s_nzones << sb->s_log_zone_size, &buf->f_blocks); |
| tmp = minix_count_free_blocks(sb); |
| put_fs_long(tmp, &buf->f_bfree); |
| put_fs_long(tmp, &buf->f_bavail); |
| put_fs_long(sb->s_ninodes, &buf->f_files); |
| put_fs_long(minix_count_free_inodes(sb), &buf->f_ffree); |
| /* Don't know what value to put in buf->f_fsid */ |
| } |
| |
| static int _minix_bmap(struct inode * inode,int block,int create) |
| { |
| struct buffer_head * bh; |
| int i; |
| |
| if (block<0) { |
| printk("_minix_bmap: block<0"); |
| return 0; |
| } |
| if (block >= 7+512+512*512) { |
| printk("_minix_bmap: block>big"); |
| return 0; |
| } |
| if (block<7) { |
| if (create && !inode->i_data[block]) |
| if (inode->i_data[block]=minix_new_block(inode->i_dev)) { |
| inode->i_ctime=CURRENT_TIME; |
| inode->i_dirt=1; |
| } |
| return inode->i_data[block]; |
| } |
| block -= 7; |
| if (block<512) { |
| if (create && !inode->i_data[7]) |
| if (inode->i_data[7]=minix_new_block(inode->i_dev)) { |
| inode->i_dirt=1; |
| inode->i_ctime=CURRENT_TIME; |
| } |
| if (!inode->i_data[7]) |
| return 0; |
| if (!(bh = bread(inode->i_dev,inode->i_data[7]))) |
| return 0; |
| i = ((unsigned short *) (bh->b_data))[block]; |
| if (create && !i) |
| if (i=minix_new_block(inode->i_dev)) { |
| ((unsigned short *) (bh->b_data))[block]=i; |
| bh->b_dirt=1; |
| } |
| brelse(bh); |
| return i; |
| } |
| block -= 512; |
| if (create && !inode->i_data[8]) |
| if (inode->i_data[8]=minix_new_block(inode->i_dev)) { |
| inode->i_dirt=1; |
| inode->i_ctime=CURRENT_TIME; |
| } |
| if (!inode->i_data[8]) |
| return 0; |
| if (!(bh=bread(inode->i_dev,inode->i_data[8]))) |
| return 0; |
| i = ((unsigned short *)bh->b_data)[block>>9]; |
| if (create && !i) |
| if (i=minix_new_block(inode->i_dev)) { |
| ((unsigned short *) (bh->b_data))[block>>9]=i; |
| bh->b_dirt=1; |
| } |
| brelse(bh); |
| if (!i) |
| return 0; |
| if (!(bh=bread(inode->i_dev,i))) |
| return 0; |
| i = ((unsigned short *)bh->b_data)[block&511]; |
| if (create && !i) |
| if (i=minix_new_block(inode->i_dev)) { |
| ((unsigned short *) (bh->b_data))[block&511]=i; |
| bh->b_dirt=1; |
| } |
| brelse(bh); |
| return i; |
| } |
| |
| int minix_bmap(struct inode * inode,int block) |
| { |
| return _minix_bmap(inode,block,0); |
| } |
| |
| int minix_create_block(struct inode * inode, int block) |
| { |
| return _minix_bmap(inode,block,1); |
| } |
| |
| void minix_read_inode(struct inode * inode) |
| { |
| struct buffer_head * bh; |
| struct minix_inode * raw_inode; |
| int block; |
| |
| block = 2 + inode->i_sb->s_imap_blocks + inode->i_sb->s_zmap_blocks + |
| (inode->i_ino-1)/MINIX_INODES_PER_BLOCK; |
| if (!(bh=bread(inode->i_dev,block))) |
| panic("unable to read i-node block"); |
| raw_inode = ((struct minix_inode *) bh->b_data) + |
| (inode->i_ino-1)%MINIX_INODES_PER_BLOCK; |
| inode->i_mode = raw_inode->i_mode; |
| inode->i_uid = raw_inode->i_uid; |
| inode->i_gid = raw_inode->i_gid; |
| inode->i_nlink = raw_inode->i_nlinks; |
| inode->i_size = raw_inode->i_size; |
| inode->i_mtime = inode->i_atime = inode->i_ctime = raw_inode->i_time; |
| if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) |
| inode->i_rdev = raw_inode->i_zone[0]; |
| else for (block = 0; block < 9; block++) |
| inode->i_data[block] = raw_inode->i_zone[block]; |
| brelse(bh); |
| inode->i_op = NULL; |
| if (S_ISREG(inode->i_mode)) |
| inode->i_op = &minix_file_inode_operations; |
| else if (S_ISDIR(inode->i_mode)) |
| inode->i_op = &minix_dir_inode_operations; |
| else if (S_ISLNK(inode->i_mode)) |
| inode->i_op = &minix_symlink_inode_operations; |
| else if (S_ISCHR(inode->i_mode)) |
| inode->i_op = &minix_chrdev_inode_operations; |
| else if (S_ISBLK(inode->i_mode)) |
| inode->i_op = &minix_blkdev_inode_operations; |
| else if (S_ISFIFO(inode->i_mode)) { |
| inode->i_op = &minix_fifo_inode_operations; |
| inode->i_size = 0; |
| inode->i_pipe = 1; |
| PIPE_HEAD(*inode) = PIPE_TAIL(*inode) = 0; |
| PIPE_READERS(*inode) = PIPE_WRITERS(*inode) = 0; |
| } |
| } |
| |
| void minix_write_inode(struct inode * inode) |
| { |
| struct buffer_head * bh; |
| struct minix_inode * raw_inode; |
| int block; |
| |
| block = 2 + inode->i_sb->s_imap_blocks + inode->i_sb->s_zmap_blocks + |
| (inode->i_ino-1)/MINIX_INODES_PER_BLOCK; |
| if (!(bh=bread(inode->i_dev,block))) |
| panic("unable to read i-node block"); |
| raw_inode = ((struct minix_inode *)bh->b_data) + |
| (inode->i_ino-1)%MINIX_INODES_PER_BLOCK; |
| raw_inode->i_mode = inode->i_mode; |
| raw_inode->i_uid = inode->i_uid; |
| raw_inode->i_gid = inode->i_gid; |
| raw_inode->i_nlinks = inode->i_nlink; |
| raw_inode->i_size = inode->i_size; |
| raw_inode->i_time = inode->i_mtime; |
| if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) |
| raw_inode->i_zone[0] = inode->i_rdev; |
| else for (block = 0; block < 9; block++) |
| raw_inode->i_zone[block] = inode->i_data[block]; |
| bh->b_dirt=1; |
| inode->i_dirt=0; |
| brelse(bh); |
| } |