/* * linux/fs/ext/inode.c * * (C) 1992 Remy Card (card@masi.ibp.fr) * * from * * linux/fs/minix/inode.c * * (C) 1991 Linus Torvalds */ #include <linux/string.h> #include <linux/stat.h> #include <linux/sched.h> #include <linux/ext_fs.h> #include <linux/kernel.h> #include <linux/mm.h> #include <asm/system.h> #include <asm/segment.h> int sync_dev(int dev); void ext_put_inode(struct inode *inode) { inode->i_size = 0; ext_truncate(inode); ext_free_inode(inode); } void ext_put_super(struct super_block *sb) { #ifdef EXTFS_BITMAP int i; #endif lock_super(sb); sb->s_dev = 0; #ifdef EXTFS_BITMAP for(i = 0 ; i < EXT_I_MAP_SLOTS ; i++) brelse(sb->s_imap[i]); for(i = 0 ; i < EXT_Z_MAP_SLOTS ; i++) brelse(sb->s_zmap[i]); #endif #ifdef EXTFS_FREELIST if (sb->s_imap[1]) brelse (sb->s_imap[1]); if (sb->s_zmap[1]) brelse (sb->s_zmap[1]); #endif free_super(sb); return; } static struct super_operations ext_sops = { ext_read_inode, ext_write_inode, ext_put_inode, ext_put_super, ext_write_super, ext_statfs }; struct super_block *ext_read_super(struct super_block *s,void *data) { struct buffer_head *bh; struct ext_super_block *es; int dev=s->s_dev,block; #ifdef EXTFS_BITMAP int i; #endif lock_super(s); if (!(bh = bread(dev,1))) { s->s_dev=0; free_super(s); printk("bread failed\n"); return NULL; } /* *((struct ext_super_block *) s) = *((struct ext_super_block *) bh->b_data); */ es = (struct ext_super_block *) bh->b_data; s->s_ninodes = es->s_ninodes; s->s_nzones = es->s_nzones; #ifdef EXTFS_BITMAP s->s_imap_blocks = es->s_imap_blocks; s->s_zmap_blocks = es->s_zmap_blocks; #endif s->s_firstdatazone = es->s_firstdatazone; s->s_log_zone_size = es->s_log_zone_size; s->s_max_size = es->s_max_size; s->s_magic = es->s_magic; #ifdef EXTFS_FREELIST s->s_zmap[0] = (struct buffer_head *) es->s_firstfreeblock; s->s_zmap[2] = (struct buffer_head *) es->s_freeblockscount; s->s_imap[0] = (struct buffer_head *) es->s_firstfreeinode; s->s_imap[2] = (struct buffer_head *) es->s_freeinodescount; #endif brelse(bh); if (s->s_magic != EXT_SUPER_MAGIC) { s->s_dev = 0; free_super(s); printk("magic match failed\n"); return NULL; } #ifdef EXTFS_BITMAP for (i=0;i < EXT_I_MAP_SLOTS;i++) s->s_imap[i] = NULL; for (i=0;i < EXT_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<EXT_I_MAP_SLOTS;i++) brelse(s->s_imap[i]); for(i=0;i<EXT_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; #endif #ifdef EXTFS_FREELIST if (!s->s_zmap[0]) s->s_zmap[1] = NULL; else if (!(s->s_zmap[1] = bread (dev, (unsigned long) s->s_zmap[0]))) { printk ("ext_read_super: unable to read first free block\n"); s->s_dev = 0; free_super(s); return NULL; } if (!s->s_imap[0]) s->s_imap[1] = NULL; else { block = 2 + (((unsigned long) s->s_imap[0]) - 1) / EXT_INODES_PER_BLOCK; if (!(s->s_imap[1] = bread (dev, block))) { printk ("ext_read_super: unable to read first free inode block\n"); brelse(s->s_zmap[1]); s->s_dev = 0; free_super (s); return NULL; } } #endif free_super(s); /* set up enough so that it can read an inode */ s->s_dev = dev; s->s_op = &ext_sops; if (!(s->s_mounted = iget(dev,EXT_ROOT_INO))) { s->s_dev=0; printk("get root inode failed\n"); return NULL; } return s; } void ext_write_super (struct super_block *sb) { #ifdef EXTFS_FREELIST struct buffer_head * bh; struct ext_super_block * es; #ifdef EXTFS_DEBUG printk ("ext_write_super called\n"); #endif if (!(bh = bread (sb->s_dev, 1))) { printk ("ext_write_super: bread failed\n"); return; } es = (struct ext_super_block *) bh->b_data; es->s_firstfreeblock = (unsigned long) sb->s_zmap[0]; es->s_freeblockscount = (unsigned long) sb->s_zmap[2]; es->s_firstfreeinode = (unsigned long) sb->s_imap[0]; es->s_freeinodescount = (unsigned long) sb->s_imap[2]; bh->b_dirt = 1; brelse (bh); sb->s_dirt = 0; #endif } void ext_statfs (struct super_block *sb, struct statfs *buf) { long tmp; put_fs_long(EXT_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 = ext_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(ext_count_free_inodes(sb), &buf->f_ffree); /* Don't know what value to put in buf->f_fsid */ } static int _ext_bmap(struct inode * inode,int block,int create) { struct buffer_head * bh; int i; if (block<0) { printk("_ext_bmap: block<0"); return 0; } if (block >= 9+256+256*256+256*256*256) { printk("_ext_bmap: block>big"); return 0; } if (block<9) { if (create && !inode->i_data[block]) if (inode->i_data[block]=ext_new_block(inode->i_dev)) { inode->i_ctime=CURRENT_TIME; inode->i_dirt=1; } return inode->i_data[block]; } block -= 9; if (block<256) { if (create && !inode->i_data[9]) if (inode->i_data[9]=ext_new_block(inode->i_dev)) { inode->i_dirt=1; inode->i_ctime=CURRENT_TIME; } if (!inode->i_data[9]) return 0; if (!(bh = bread(inode->i_dev,inode->i_data[9]))) return 0; i = ((unsigned long *) (bh->b_data))[block]; if (create && !i) if (i=ext_new_block(inode->i_dev)) { ((unsigned long *) (bh->b_data))[block]=i; bh->b_dirt=1; } brelse(bh); return i; } block -= 256; if (block<256*256) { if (create && !inode->i_data[10]) if (inode->i_data[10]=ext_new_block(inode->i_dev)) { inode->i_dirt=1; inode->i_ctime=CURRENT_TIME; } if (!inode->i_data[10]) return 0; if (!(bh=bread(inode->i_dev,inode->i_data[10]))) return 0; i = ((unsigned long *)bh->b_data)[block>>8]; if (create && !i) if (i=ext_new_block(inode->i_dev)) { ((unsigned long *) (bh->b_data))[block>>8]=i; bh->b_dirt=1; } brelse(bh); if (!i) return 0; if (!(bh=bread(inode->i_dev,i))) return 0; i = ((unsigned long *)bh->b_data)[block&255]; if (create && !i) if (i=ext_new_block(inode->i_dev)) { ((unsigned long *) (bh->b_data))[block&255]=i; bh->b_dirt=1; } brelse(bh); return i; } printk("ext_bmap: triple indirection not yet implemented\n"); return 0; } int ext_bmap(struct inode * inode,int block) { return _ext_bmap(inode,block,0); } int ext_create_block(struct inode * inode, int block) { return _ext_bmap(inode,block,1); } void ext_read_inode(struct inode * inode) { struct buffer_head * bh; struct ext_inode * raw_inode; int block; #ifdef EXTFS_BITMAP block = 2 + inode->i_sb->s_imap_blocks + inode->i_sb->s_zmap_blocks + (inode->i_ino-1)/EXT_INODES_PER_BLOCK; #endif #ifdef EXTFS_FREELIST block = 2 + (inode->i_ino-1)/EXT_INODES_PER_BLOCK; #endif if (!(bh=bread(inode->i_dev,block))) panic("unable to read i-node block"); raw_inode = ((struct ext_inode *) bh->b_data) + (inode->i_ino-1)%EXT_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 < 12; 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 = &ext_file_inode_operations; else if (S_ISDIR(inode->i_mode)) inode->i_op = &ext_dir_inode_operations; else if (S_ISLNK(inode->i_mode)) inode->i_op = &ext_symlink_inode_operations; else if (S_ISCHR(inode->i_mode)) inode->i_op = &ext_chrdev_inode_operations; else if (S_ISBLK(inode->i_mode)) inode->i_op = &ext_blkdev_inode_operations; else if (S_ISFIFO(inode->i_mode)) { inode->i_op = &ext_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 ext_write_inode(struct inode * inode) { struct buffer_head * bh; struct ext_inode * raw_inode; int block; #ifdef EXTFS_BITMAP block = 2 + inode->i_sb->s_imap_blocks + inode->i_sb->s_zmap_blocks + (inode->i_ino-1)/EXT_INODES_PER_BLOCK; #endif #ifdef EXTFS_FREELIST block = 2 + (inode->i_ino-1)/EXT_INODES_PER_BLOCK; #endif if (!(bh=bread(inode->i_dev,block))) panic("unable to read i-node block"); raw_inode = ((struct ext_inode *)bh->b_data) + (inode->i_ino-1)%EXT_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 < 12; block++) raw_inode->i_zone[block] = inode->i_data[block]; bh->b_dirt=1; inode->i_dirt=0; brelse(bh); }