[net-next-2.6.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"

/* This is only called on sync() and umount(), when s_dirt=1. */
static void sysv_write_super(struct super_block *sb)
{
	struct sysv_sb_info *sbi = SYSV_SB(sb);
	unsigned long time = get_seconds(), old_time;

	lock_kernel();
	if (sb->s_flags & MS_RDONLY)
		goto clean;

	/*
	 * 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);
	}
clean:
	sb->s_dirt = 0;
	unlock_kernel();
}

static int sysv_remount(struct super_block *sb, int *flags, char *data)
{
	struct sysv_sb_info *sbi = SYSV_SB(sb);
	if (sbi->s_forced_ro)
		*flags |= MS_RDONLY;
	if (!(*flags & MS_RDONLY))
		sb->s_dirt = 1;
	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);
	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);
}

static struct buffer_head * sysv_update_inode(struct inode * inode)
{
	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;

	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 NULL;
	}
	raw_inode = sysv_raw_inode(sb, ino, &bh);
	if (!raw_inode) {
		printk("unable to read i-node block\n");
		return NULL;
	}

	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);
	return bh;
}

int sysv_write_inode(struct inode * inode, int wait)
{
	struct buffer_head *bh;
	lock_kernel();
	bh = sysv_update_inode(inode);
	brelse(bh);
	unlock_kernel();
	return 0;
}

int sysv_sync_inode(struct inode * inode)
{
        int err = 0;
        struct buffer_head *bh;

        bh = sysv_update_inode(inode);
        if (bh && buffer_dirty(bh)) {
                sync_dirty_buffer(bh);
                if (buffer_req(bh) && !buffer_uptodate(bh)) {
                        printk ("IO error syncing sysv inode [%s:%08lx]\n",
                                inode->i_sb->s_id, inode->i_ino);
                        err = -1;
                }
        }
        else if (!bh)
                err = -1;
        brelse (bh);
        return err;
}

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