/* *  linux/fs/sysv/inode.c * *  minix/inode.c *  Copyright (C) 1991, 1992  Linus Torvalds * *  xenix/inode.c *  Copyright (C) 1992  Doug Evans * *  coh/inode.c *  Copyright (C) 1993  Pascal Haible, Bruno Haible * *  sysv/inode.c *  Copyright (C) 1993  Paul B. Monday * *  sysv/inode.c *  Copyright (C) 1993  Bruno Haible *  Copyright (C) 1997, 1998  Krzysztof G. Baranowski * *  This file contains code for allocating/freeing inodes and for read/writing *  the superblock. */ #include <linux/highuid.h>#include <linux/slab.h>#include <linux/init.h>#include <linux/buffer_head.h>#include <linux/vfs.h>#include <linux/writeback.h>#include <linux/namei.h>#include <asm/byteorder.h>#include "sysv.h" static int sysv_sync_fs(struct super_block *sb, int wait){	struct sysv_sb_info *sbi = SYSV_SB(sb);	unsigned long time = get_seconds(), old_time; 	lock_super(sb); 	/*	 * If we are going to write out the super block,	 * then attach current time stamp.	 * But if the filesystem was marked clean, keep it clean.	 */	sb->s_dirt = 0;	old_time = fs32_to_cpu(sbi, *sbi->s_sb_time);	if (sbi->s_type == FSTYPE_SYSV4) {		if (*sbi->s_sb_state == cpu_to_fs32(sbi, 0x7c269d38 - old_time))			*sbi->s_sb_state = cpu_to_fs32(sbi, 0x7c269d38 - time);		*sbi->s_sb_time = cpu_to_fs32(sbi, time);		mark_buffer_dirty(sbi->s_bh2);	} 	unlock_super(sb); 	return 0;} static void sysv_write_super(struct super_block *sb){	if (!(sb->s_flags & MS_RDONLY))		sysv_sync_fs(sb, 1);	else		sb->s_dirt = 0;} static int sysv_remount(struct super_block *sb, int *flags, char *data){	struct sysv_sb_info *sbi = SYSV_SB(sb);	lock_super(sb);	if (sbi->s_forced_ro)		*flags |= MS_RDONLY;	if (*flags & MS_RDONLY)		sysv_write_super(sb);	unlock_super(sb);	return 0;} static void sysv_put_super(struct super_block *sb){	struct sysv_sb_info *sbi = SYSV_SB(sb); 	if (sb->s_dirt)		sysv_write_super(sb); 	if (!(sb->s_flags & MS_RDONLY)) {		/* XXX ext2 also updates the state here */		mark_buffer_dirty(sbi->s_bh1);		if (sbi->s_bh1 != sbi->s_bh2)			mark_buffer_dirty(sbi->s_bh2);	} 	brelse(sbi->s_bh1);	if (sbi->s_bh1 != sbi->s_bh2)		brelse(sbi->s_bh2); 	kfree(sbi);} static int sysv_statfs(struct dentry *dentry, struct kstatfs *buf){	struct super_block *sb = dentry->d_sb;	struct sysv_sb_info *sbi = SYSV_SB(sb);	u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 	buf->f_type = sb->s_magic;	buf->f_bsize = sb->s_blocksize;	buf->f_blocks = sbi->s_ndatazones;	buf->f_bavail = buf->f_bfree = sysv_count_free_blocks(sb);	buf->f_files = sbi->s_ninodes;	buf->f_ffree = sysv_count_free_inodes(sb);	buf->f_namelen = SYSV_NAMELEN;	buf->f_fsid.val[0] = (u32)id;	buf->f_fsid.val[1] = (u32)(id >> 32);	return 0;} /*  * NXI <-> N0XI for PDP, XIN <-> XIN0 for le32, NIX <-> 0NIX for be32 */static inline void read3byte(struct sysv_sb_info *sbi,	unsigned char * from, unsigned char * to){	if (sbi->s_bytesex == BYTESEX_PDP) {		to[0] = from[0];		to[1] = 0;		to[2] = from[1];		to[3] = from[2];	} else if (sbi->s_bytesex == BYTESEX_LE) {		to[0] = from[0];		to[1] = from[1];		to[2] = from[2];		to[3] = 0;	} else {		to[0] = 0;		to[1] = from[0];		to[2] = from[1];		to[3] = from[2];	}} static inline void write3byte(struct sysv_sb_info *sbi,	unsigned char * from, unsigned char * to){	if (sbi->s_bytesex == BYTESEX_PDP) {		to[0] = from[0];		to[1] = from[2];		to[2] = from[3];	} else if (sbi->s_bytesex == BYTESEX_LE) {		to[0] = from[0];		to[1] = from[1];		to[2] = from[2];	} else {		to[0] = from[1];		to[1] = from[2];		to[2] = from[3];	}} static const struct inode_operations sysv_symlink_inode_operations = {	.readlink	= generic_readlink,	.follow_link	= page_follow_link_light,	.put_link	= page_put_link,	.getattr	= sysv_getattr,}; void sysv_set_inode(struct inode *inode, dev_t rdev){	if (S_ISREG(inode->i_mode)) {		inode->i_op = &sysv_file_inode_operations;		inode->i_fop = &sysv_file_operations;		inode->i_mapping->a_ops = &sysv_aops;	} else if (S_ISDIR(inode->i_mode)) {		inode->i_op = &sysv_dir_inode_operations;		inode->i_fop = &sysv_dir_operations;		inode->i_mapping->a_ops = &sysv_aops;	} else if (S_ISLNK(inode->i_mode)) {		if (inode->i_blocks) {			inode->i_op = &sysv_symlink_inode_operations;			inode->i_mapping->a_ops = &sysv_aops;		} else {			inode->i_op = &sysv_fast_symlink_inode_operations;			nd_terminate_link(SYSV_I(inode)->i_data, inode->i_size,				sizeof(SYSV_I(inode)->i_data) - 1);		}	} else		init_special_inode(inode, inode->i_mode, rdev);} struct inode *sysv_iget(struct super_block *sb, unsigned int ino){	struct sysv_sb_info * sbi = SYSV_SB(sb);	struct buffer_head * bh;	struct sysv_inode * raw_inode;	struct sysv_inode_info * si;	struct inode *inode;	unsigned int block; 	if (!ino || ino > sbi->s_ninodes) {		printk("Bad inode number on dev %s: %d is out of range\n",		       sb->s_id, ino);		return ERR_PTR(-EIO);	} 	inode = iget_locked(sb, ino);	if (!inode)		return ERR_PTR(-ENOMEM);	if (!(inode->i_state & I_NEW))		return inode; 	raw_inode = sysv_raw_inode(sb, ino, &bh);	if (!raw_inode) {		printk("Major problem: unable to read inode from dev %s\n",		       inode->i_sb->s_id);		goto bad_inode;	}	/* SystemV FS: kludge permissions if ino==SYSV_ROOT_INO ?? */	inode->i_mode = fs16_to_cpu(sbi, raw_inode->i_mode);	inode->i_uid = (uid_t)fs16_to_cpu(sbi, raw_inode->i_uid);	inode->i_gid = (gid_t)fs16_to_cpu(sbi, raw_inode->i_gid);	set_nlink(inode, fs16_to_cpu(sbi, raw_inode->i_nlink));	inode->i_size = fs32_to_cpu(sbi, raw_inode->i_size);	inode->i_atime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_atime);	inode->i_mtime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_mtime);	inode->i_ctime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_ctime);	inode->i_ctime.tv_nsec = 0;	inode->i_atime.tv_nsec = 0;	inode->i_mtime.tv_nsec = 0;	inode->i_blocks = 0; 	si = SYSV_I(inode);	for (block = 0; block < 10+1+1+1; block++)		read3byte(sbi, &raw_inode->i_data[3*block],				(u8 *)&si->i_data[block]);	brelse(bh);	si->i_dir_start_lookup = 0;	if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))		sysv_set_inode(inode,			       old_decode_dev(fs32_to_cpu(sbi, si->i_data[0])));	else		sysv_set_inode(inode, 0);	unlock_new_inode(inode);	return inode; bad_inode:	iget_failed(inode);	return ERR_PTR(-EIO);} static int __sysv_write_inode(struct inode *inode, int wait){	struct super_block * sb = inode->i_sb;	struct sysv_sb_info * sbi = SYSV_SB(sb);	struct buffer_head * bh;	struct sysv_inode * raw_inode;	struct sysv_inode_info * si;	unsigned int ino, block;	int err = 0; 	ino = inode->i_ino;	if (!ino || ino > sbi->s_ninodes) {		printk("Bad inode number on dev %s: %d is out of range\n",		       inode->i_sb->s_id, ino);		return -EIO;	}	raw_inode = sysv_raw_inode(sb, ino, &bh);	if (!raw_inode) {		printk("unable to read i-node block\n");		return -EIO;	} 	raw_inode->i_mode = cpu_to_fs16(sbi, inode->i_mode);	raw_inode->i_uid = cpu_to_fs16(sbi, fs_high2lowuid(inode->i_uid));	raw_inode->i_gid = cpu_to_fs16(sbi, fs_high2lowgid(inode->i_gid));	raw_inode->i_nlink = cpu_to_fs16(sbi, inode->i_nlink);	raw_inode->i_size = cpu_to_fs32(sbi, inode->i_size);	raw_inode->i_atime = cpu_to_fs32(sbi, inode->i_atime.tv_sec);	raw_inode->i_mtime = cpu_to_fs32(sbi, inode->i_mtime.tv_sec);	raw_inode->i_ctime = cpu_to_fs32(sbi, inode->i_ctime.tv_sec); 	si = SYSV_I(inode);	if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))		si->i_data[0] = cpu_to_fs32(sbi, old_encode_dev(inode->i_rdev));	for (block = 0; block < 10+1+1+1; block++)		write3byte(sbi, (u8 *)&si->i_data[block],			&raw_inode->i_data[3*block]);	mark_buffer_dirty(bh);	if (wait) {                sync_dirty_buffer(bh);                if (buffer_req(bh) && !buffer_uptodate(bh)) {                        printk ("IO error syncing sysv inode [%s:%08x]\n",                                sb->s_id, ino);                        err = -EIO;                }        }	brelse(bh);	return 0;} int sysv_write_inode(struct inode *inode, struct writeback_control *wbc){	return __sysv_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);} int sysv_sync_inode(struct inode *inode){	return __sysv_write_inode(inode, 1);} static void sysv_evict_inode(struct inode *inode){	truncate_inode_pages(&inode->i_data, 0);	if (!inode->i_nlink) {		inode->i_size = 0;		sysv_truncate(inode);	}	invalidate_inode_buffers(inode);	clear_inode(inode);	if (!inode->i_nlink)		sysv_free_inode(inode);} static struct kmem_cache *sysv_inode_cachep; static struct inode *sysv_alloc_inode(struct super_block *sb){	struct sysv_inode_info *si; 	si = kmem_cache_alloc(sysv_inode_cachep, GFP_KERNEL);	if (!si)		return NULL;	return &si->vfs_inode;} static void sysv_i_callback(struct rcu_head *head){	struct inode *inode = container_of(head, struct inode, i_rcu);	kmem_cache_free(sysv_inode_cachep, SYSV_I(inode));} static void sysv_destroy_inode(struct inode *inode){	call_rcu(&inode->i_rcu, sysv_i_callback);} static void init_once(void *p){	struct sysv_inode_info *si = (struct sysv_inode_info *)p; 	inode_init_once(&si->vfs_inode);} const struct super_operations sysv_sops = {	.alloc_inode	= sysv_alloc_inode,	.destroy_inode	= sysv_destroy_inode,	.write_inode	= sysv_write_inode,	.evict_inode	= sysv_evict_inode,	.put_super	= sysv_put_super,	.write_super	= sysv_write_super,	.sync_fs	= sysv_sync_fs,	.remount_fs	= sysv_remount,	.statfs		= sysv_statfs,}; int __init sysv_init_icache(void){	sysv_inode_cachep = kmem_cache_create("sysv_inode_cache",			sizeof(struct sysv_inode_info), 0,			SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,			init_once);	if (!sysv_inode_cachep)		return -ENOMEM;	return 0;} void sysv_destroy_icache(void){	kmem_cache_destroy(sysv_inode_cachep);}