[linux-block.git] / fs / sysv / inode.c

/*
 *  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/smp_lock.h>
#include <linux/highuid.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/buffer_head.h>
#include <linux/vfs.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);
	lock_kernel();

	/*
	 * 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.
	 */
	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_kernel();
	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))
		sb->s_dirt = 1;
	unlock_super(sb);
	return 0;
}

static void sysv_put_super(struct super_block *sb)
{
	struct sysv_sb_info *sbi = SYSV_SB(sb);

	lock_kernel();

	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);

	unlock_kernel();
}

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);
	inode->i_nlink = 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);
}

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;
	}

	lock_kernel();
	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]);
	unlock_kernel();
	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_sync_inode(struct inode *inode)
{
	return sysv_write_inode(inode, 1);
}

static void sysv_delete_inode(struct inode *inode)
{
	truncate_inode_pages(&inode->i_data, 0);
	inode->i_size = 0;
	sysv_truncate(inode);
	lock_kernel();
	sysv_free_inode(inode);
	unlock_kernel();
}

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_destroy_inode(struct inode *inode)
{
	kmem_cache_free(sysv_inode_cachep, SYSV_I(inode));
}

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,
	.delete_inode	= sysv_delete_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);
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/sysv/inode.c
	3	*
	4	* minix/inode.c
	5	* Copyright (C) 1991, 1992 Linus Torvalds
	6	*
	7	* xenix/inode.c
	8	* Copyright (C) 1992 Doug Evans
	9	*
	10	* coh/inode.c
	11	* Copyright (C) 1993 Pascal Haible, Bruno Haible
	12	*
	13	* sysv/inode.c
	14	* Copyright (C) 1993 Paul B. Monday
	15	*
	16	* sysv/inode.c
	17	* Copyright (C) 1993 Bruno Haible
	18	* Copyright (C) 1997, 1998 Krzysztof G. Baranowski
	19	*
	20	* This file contains code for allocating/freeing inodes and for read/writing
	21	* the superblock.
	22	*/
	23
	24	#include <linux/smp_lock.h>
	25	#include <linux/highuid.h>
	26	#include <linux/slab.h>
	27	#include <linux/init.h>
	28	#include <linux/buffer_head.h>
	29	#include <linux/vfs.h>
21acaf8e	30	#include <linux/namei.h>
1da177e4 LT	31	#include <asm/byteorder.h>
	32	#include "sysv.h"
	33
ad43ffde	34	static int sysv_sync_fs(struct super_block *sb, int wait)
1da177e4 LT	35	{
	36	struct sysv_sb_info *sbi = SYSV_SB(sb);
	37	unsigned long time = get_seconds(), old_time;
	38
ebc1ac16	39	lock_super(sb);
1da177e4	40	lock_kernel();
1da177e4 LT	41
	42	/*
	43	* If we are going to write out the super block,
	44	* then attach current time stamp.
	45	* But if the filesystem was marked clean, keep it clean.
	46	*/
	47	old_time = fs32_to_cpu(sbi, *sbi->s_sb_time);
	48	if (sbi->s_type == FSTYPE_SYSV4) {
	49	if (*sbi->s_sb_state == cpu_to_fs32(sbi, 0x7c269d38 - old_time))
	50	*sbi->s_sb_state = cpu_to_fs32(sbi, 0x7c269d38 - time);
	51	*sbi->s_sb_time = cpu_to_fs32(sbi, time);
	52	mark_buffer_dirty(sbi->s_bh2);
	53	}
ad43ffde	54
1da177e4	55	unlock_kernel();
ebc1ac16	56	unlock_super(sb);
ad43ffde CH	57
	58	return 0;
	59	}
	60
	61	static void sysv_write_super(struct super_block *sb)
	62	{
	63	if (!(sb->s_flags & MS_RDONLY))
	64	sysv_sync_fs(sb, 1);
	65	else
	66	sb->s_dirt = 0;
1da177e4 LT	67	}
	68
	69	static int sysv_remount(struct super_block sb, int flags, char *data)
	70	{
	71	struct sysv_sb_info *sbi = SYSV_SB(sb);
bbd6851a	72	lock_super(sb);
1da177e4 LT	73	if (sbi->s_forced_ro)
	74	*flags \|= MS_RDONLY;
	75	if (!(*flags & MS_RDONLY))
	76	sb->s_dirt = 1;
bbd6851a	77	unlock_super(sb);
1da177e4 LT	78	return 0;
	79	}
	80
	81	static void sysv_put_super(struct super_block *sb)
	82	{
	83	struct sysv_sb_info *sbi = SYSV_SB(sb);
	84
6cfd0148 CH	85	lock_kernel();
6cfd0148 CH	86
8c85e125 CH	87	if (sb->s_dirt)
	88	sysv_write_super(sb);
	89
1da177e4 LT	90	if (!(sb->s_flags & MS_RDONLY)) {
	91	/* XXX ext2 also updates the state here */
	92	mark_buffer_dirty(sbi->s_bh1);
	93	if (sbi->s_bh1 != sbi->s_bh2)
	94	mark_buffer_dirty(sbi->s_bh2);
	95	}
	96
	97	brelse(sbi->s_bh1);
	98	if (sbi->s_bh1 != sbi->s_bh2)
	99	brelse(sbi->s_bh2);
	100
	101	kfree(sbi);
6cfd0148 CH	102
6cfd0148 CH	103	unlock_kernel();
1da177e4 LT	104	}
1da177e4 LT	105
726c3342	106	static int sysv_statfs(struct dentry dentry, struct kstatfs buf)
1da177e4	107	{
726c3342	108	struct super_block *sb = dentry->d_sb;
1da177e4	109	struct sysv_sb_info *sbi = SYSV_SB(sb);
1c5b4541	110	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
1da177e4 LT	111
	112	buf->f_type = sb->s_magic;
	113	buf->f_bsize = sb->s_blocksize;
	114	buf->f_blocks = sbi->s_ndatazones;
	115	buf->f_bavail = buf->f_bfree = sysv_count_free_blocks(sb);
	116	buf->f_files = sbi->s_ninodes;
	117	buf->f_ffree = sysv_count_free_inodes(sb);
	118	buf->f_namelen = SYSV_NAMELEN;
1c5b4541 CL	119	buf->f_fsid.val[0] = (u32)id;
1c5b4541 CL	120	buf->f_fsid.val[1] = (u32)(id >> 32);
1da177e4 LT	121	return 0;
	122	}
	123
	124	/*
	125	* NXI <-> N0XI for PDP, XIN <-> XIN0 for le32, NIX <-> 0NIX for be32
	126	*/
	127	static inline void read3byte(struct sysv_sb_info *sbi,
	128	unsigned char * from, unsigned char * to)
	129	{
	130	if (sbi->s_bytesex == BYTESEX_PDP) {
	131	to[0] = from[0];
	132	to[1] = 0;
	133	to[2] = from[1];
	134	to[3] = from[2];
	135	} else if (sbi->s_bytesex == BYTESEX_LE) {
	136	to[0] = from[0];
	137	to[1] = from[1];
	138	to[2] = from[2];
	139	to[3] = 0;
	140	} else {
	141	to[0] = 0;
	142	to[1] = from[0];
	143	to[2] = from[1];
	144	to[3] = from[2];
	145	}
	146	}
	147
	148	static inline void write3byte(struct sysv_sb_info *sbi,
	149	unsigned char * from, unsigned char * to)
	150	{
	151	if (sbi->s_bytesex == BYTESEX_PDP) {
	152	to[0] = from[0];
	153	to[1] = from[2];
	154	to[2] = from[3];
	155	} else if (sbi->s_bytesex == BYTESEX_LE) {
	156	to[0] = from[0];
	157	to[1] = from[1];
	158	to[2] = from[2];
	159	} else {
	160	to[0] = from[1];
	161	to[1] = from[2];
	162	to[2] = from[3];
	163	}
	164	}
	165
c5ef1c42	166	static const struct inode_operations sysv_symlink_inode_operations = {
1da177e4 LT	167	.readlink = generic_readlink,
	168	.follow_link = page_follow_link_light,
	169	.put_link = page_put_link,
	170	.getattr = sysv_getattr,
	171	};
	172
	173	void sysv_set_inode(struct inode *inode, dev_t rdev)
	174	{
	175	if (S_ISREG(inode->i_mode)) {
	176	inode->i_op = &sysv_file_inode_operations;
	177	inode->i_fop = &sysv_file_operations;
	178	inode->i_mapping->a_ops = &sysv_aops;
	179	} else if (S_ISDIR(inode->i_mode)) {
	180	inode->i_op = &sysv_dir_inode_operations;
	181	inode->i_fop = &sysv_dir_operations;
	182	inode->i_mapping->a_ops = &sysv_aops;
	183	} else if (S_ISLNK(inode->i_mode)) {
	184	if (inode->i_blocks) {
	185	inode->i_op = &sysv_symlink_inode_operations;
	186	inode->i_mapping->a_ops = &sysv_aops;
21acaf8e	187	} else {
1da177e4	188	inode->i_op = &sysv_fast_symlink_inode_operations;
21acaf8e DG	189	nd_terminate_link(SYSV_I(inode)->i_data, inode->i_size,
	190	sizeof(SYSV_I(inode)->i_data) - 1);
	191	}
1da177e4 LT	192	} else
	193	init_special_inode(inode, inode->i_mode, rdev);
	194	}
	195
b8e1343f	196	struct inode sysv_iget(struct super_block sb, unsigned int ino)
1da177e4	197	{
1da177e4 LT	198	struct sysv_sb_info * sbi = SYSV_SB(sb);
	199	struct buffer_head * bh;
	200	struct sysv_inode * raw_inode;
	201	struct sysv_inode_info * si;
b8e1343f DH	202	struct inode *inode;
b8e1343f DH	203	unsigned int block;
1da177e4 LT	204
	205	if (!ino \|\| ino > sbi->s_ninodes) {
	206	printk("Bad inode number on dev %s: %d is out of range\n",
b8e1343f DH	207	sb->s_id, ino);
b8e1343f DH	208	return ERR_PTR(-EIO);
1da177e4	209	}
b8e1343f DH	210
	211	inode = iget_locked(sb, ino);
	212	if (!inode)
	213	return ERR_PTR(-ENOMEM);
	214	if (!(inode->i_state & I_NEW))
	215	return inode;
	216
1da177e4 LT	217	raw_inode = sysv_raw_inode(sb, ino, &bh);
	218	if (!raw_inode) {
	219	printk("Major problem: unable to read inode from dev %s\n",
	220	inode->i_sb->s_id);
	221	goto bad_inode;
	222	}
	223	/* SystemV FS: kludge permissions if ino==SYSV_ROOT_INO ?? */
	224	inode->i_mode = fs16_to_cpu(sbi, raw_inode->i_mode);
	225	inode->i_uid = (uid_t)fs16_to_cpu(sbi, raw_inode->i_uid);
	226	inode->i_gid = (gid_t)fs16_to_cpu(sbi, raw_inode->i_gid);
	227	inode->i_nlink = fs16_to_cpu(sbi, raw_inode->i_nlink);
	228	inode->i_size = fs32_to_cpu(sbi, raw_inode->i_size);
	229	inode->i_atime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_atime);
	230	inode->i_mtime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_mtime);
	231	inode->i_ctime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_ctime);
	232	inode->i_ctime.tv_nsec = 0;
	233	inode->i_atime.tv_nsec = 0;
	234	inode->i_mtime.tv_nsec = 0;
ba52de12	235	inode->i_blocks = 0;
1da177e4 LT	236
	237	si = SYSV_I(inode);
	238	for (block = 0; block < 10+1+1+1; block++)
	239	read3byte(sbi, &raw_inode->i_data[3*block],
	240	(u8 *)&si->i_data[block]);
	241	brelse(bh);
	242	si->i_dir_start_lookup = 0;
	243	if (S_ISCHR(inode->i_mode) \|\| S_ISBLK(inode->i_mode))
	244	sysv_set_inode(inode,
	245	old_decode_dev(fs32_to_cpu(sbi, si->i_data[0])));
	246	else
	247	sysv_set_inode(inode, 0);
b8e1343f DH	248	unlock_new_inode(inode);
b8e1343f DH	249	return inode;
1da177e4 LT	250
1da177e4 LT	251	bad_inode:
b8e1343f DH	252	iget_failed(inode);
b8e1343f DH	253	return ERR_PTR(-EIO);
1da177e4 LT	254	}
1da177e4 LT	255
05459ca8	256	int sysv_write_inode(struct inode *inode, int wait)
1da177e4 LT	257	{
	258	struct super_block * sb = inode->i_sb;
	259	struct sysv_sb_info * sbi = SYSV_SB(sb);
	260	struct buffer_head * bh;
	261	struct sysv_inode * raw_inode;
	262	struct sysv_inode_info * si;
	263	unsigned int ino, block;
05459ca8	264	int err = 0;
1da177e4 LT	265
	266	ino = inode->i_ino;
	267	if (!ino \|\| ino > sbi->s_ninodes) {
	268	printk("Bad inode number on dev %s: %d is out of range\n",
	269	inode->i_sb->s_id, ino);
05459ca8	270	return -EIO;
1da177e4 LT	271	}
	272	raw_inode = sysv_raw_inode(sb, ino, &bh);
	273	if (!raw_inode) {
	274	printk("unable to read i-node block\n");
05459ca8	275	return -EIO;
1da177e4 LT	276	}
1da177e4 LT	277
05459ca8	278	lock_kernel();
1da177e4 LT	279	raw_inode->i_mode = cpu_to_fs16(sbi, inode->i_mode);
	280	raw_inode->i_uid = cpu_to_fs16(sbi, fs_high2lowuid(inode->i_uid));
	281	raw_inode->i_gid = cpu_to_fs16(sbi, fs_high2lowgid(inode->i_gid));
	282	raw_inode->i_nlink = cpu_to_fs16(sbi, inode->i_nlink);
	283	raw_inode->i_size = cpu_to_fs32(sbi, inode->i_size);
	284	raw_inode->i_atime = cpu_to_fs32(sbi, inode->i_atime.tv_sec);
	285	raw_inode->i_mtime = cpu_to_fs32(sbi, inode->i_mtime.tv_sec);
	286	raw_inode->i_ctime = cpu_to_fs32(sbi, inode->i_ctime.tv_sec);
	287
	288	si = SYSV_I(inode);
	289	if (S_ISCHR(inode->i_mode) \|\| S_ISBLK(inode->i_mode))
	290	si->i_data[0] = cpu_to_fs32(sbi, old_encode_dev(inode->i_rdev));
	291	for (block = 0; block < 10+1+1+1; block++)
	292	write3byte(sbi, (u8 *)&si->i_data[block],
	293	&raw_inode->i_data[3*block]);
05459ca8	294	unlock_kernel();
1da177e4	295	mark_buffer_dirty(bh);
05459ca8 AV	296	if (wait) {
	297	sync_dirty_buffer(bh);
	298	if (buffer_req(bh) && !buffer_uptodate(bh)) {
	299	printk ("IO error syncing sysv inode [%s:%08x]\n",
	300	sb->s_id, ino);
	301	err = -EIO;
	302	}
	303	}
1da177e4	304	brelse(bh);
1da177e4 LT	305	return 0;
	306	}
	307
05459ca8	308	int sysv_sync_inode(struct inode *inode)
1da177e4	309	{
05459ca8	310	return sysv_write_inode(inode, 1);
1da177e4 LT	311	}
	312
	313	static void sysv_delete_inode(struct inode *inode)
	314	{
fef26658	315	truncate_inode_pages(&inode->i_data, 0);
1da177e4 LT	316	inode->i_size = 0;
	317	sysv_truncate(inode);
	318	lock_kernel();
	319	sysv_free_inode(inode);
	320	unlock_kernel();
	321	}
	322
e18b890b	323	static struct kmem_cache *sysv_inode_cachep;
1da177e4 LT	324
	325	static struct inode sysv_alloc_inode(struct super_block sb)
	326	{
	327	struct sysv_inode_info *si;
	328
e94b1766	329	si = kmem_cache_alloc(sysv_inode_cachep, GFP_KERNEL);
1da177e4 LT	330	if (!si)
	331	return NULL;
	332	return &si->vfs_inode;
	333	}
	334
	335	static void sysv_destroy_inode(struct inode *inode)
	336	{
	337	kmem_cache_free(sysv_inode_cachep, SYSV_I(inode));
	338	}
	339
51cc5068	340	static void init_once(void *p)
1da177e4 LT	341	{
	342	struct sysv_inode_info si = (struct sysv_inode_info )p;
	343
a35afb83	344	inode_init_once(&si->vfs_inode);
1da177e4 LT	345	}
1da177e4 LT	346
ee9b6d61	347	const struct super_operations sysv_sops = {
1da177e4 LT	348	.alloc_inode = sysv_alloc_inode,
1da177e4 LT	349	.destroy_inode = sysv_destroy_inode,
1da177e4 LT	350	.write_inode = sysv_write_inode,
	351	.delete_inode = sysv_delete_inode,
	352	.put_super = sysv_put_super,
	353	.write_super = sysv_write_super,
ad43ffde	354	.sync_fs = sysv_sync_fs,
1da177e4 LT	355	.remount_fs = sysv_remount,
	356	.statfs = sysv_statfs,
	357	};
	358
	359	int __init sysv_init_icache(void)
	360	{
	361	sysv_inode_cachep = kmem_cache_create("sysv_inode_cache",
	362	sizeof(struct sysv_inode_info), 0,
4b6a9316	363	SLAB_RECLAIM_ACCOUNT\|SLAB_MEM_SPREAD,
20c2df83	364	init_once);
1da177e4 LT	365	if (!sysv_inode_cachep)
	366	return -ENOMEM;
	367	return 0;
	368	}
	369
	370	void sysv_destroy_icache(void)
	371	{
	372	kmem_cache_destroy(sysv_inode_cachep);
	373	}