[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/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.
	 */
	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))
		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);

	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 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_delete_inode(struct inode *inode)
{
	truncate_inode_pages(&inode->i_data, 0);
	inode->i_size = 0;
	sysv_truncate(inode);
	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_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
1da177e4 LT	24	#include <linux/highuid.h>
	25	#include <linux/slab.h>
	26	#include <linux/init.h>
	27	#include <linux/buffer_head.h>
	28	#include <linux/vfs.h>
a9185b41	29	#include <linux/writeback.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 LT	40
	41	/*
	42	* If we are going to write out the super block,
	43	* then attach current time stamp.
	44	* But if the filesystem was marked clean, keep it clean.
	45	*/
	46	old_time = fs32_to_cpu(sbi, *sbi->s_sb_time);
	47	if (sbi->s_type == FSTYPE_SYSV4) {
	48	if (*sbi->s_sb_state == cpu_to_fs32(sbi, 0x7c269d38 - old_time))
	49	*sbi->s_sb_state = cpu_to_fs32(sbi, 0x7c269d38 - time);
	50	*sbi->s_sb_time = cpu_to_fs32(sbi, time);
	51	mark_buffer_dirty(sbi->s_bh2);
	52	}
ad43ffde	53
ebc1ac16	54	unlock_super(sb);
ad43ffde CH	55
	56	return 0;
	57	}
	58
	59	static void sysv_write_super(struct super_block *sb)
	60	{
	61	if (!(sb->s_flags & MS_RDONLY))
	62	sysv_sync_fs(sb, 1);
	63	else
	64	sb->s_dirt = 0;
1da177e4 LT	65	}
	66
	67	static int sysv_remount(struct super_block sb, int flags, char *data)
	68	{
	69	struct sysv_sb_info *sbi = SYSV_SB(sb);
bbd6851a	70	lock_super(sb);
1da177e4 LT	71	if (sbi->s_forced_ro)
	72	*flags \|= MS_RDONLY;
	73	if (!(*flags & MS_RDONLY))
	74	sb->s_dirt = 1;
bbd6851a	75	unlock_super(sb);
1da177e4 LT	76	return 0;
	77	}
	78
	79	static void sysv_put_super(struct super_block *sb)
	80	{
	81	struct sysv_sb_info *sbi = SYSV_SB(sb);
	82
8c85e125 CH	83	if (sb->s_dirt)
	84	sysv_write_super(sb);
	85
1da177e4 LT	86	if (!(sb->s_flags & MS_RDONLY)) {
	87	/* XXX ext2 also updates the state here */
	88	mark_buffer_dirty(sbi->s_bh1);
	89	if (sbi->s_bh1 != sbi->s_bh2)
	90	mark_buffer_dirty(sbi->s_bh2);
	91	}
	92
	93	brelse(sbi->s_bh1);
	94	if (sbi->s_bh1 != sbi->s_bh2)
	95	brelse(sbi->s_bh2);
	96
	97	kfree(sbi);
	98	}
	99
726c3342	100	static int sysv_statfs(struct dentry dentry, struct kstatfs buf)
1da177e4	101	{
726c3342	102	struct super_block *sb = dentry->d_sb;
1da177e4	103	struct sysv_sb_info *sbi = SYSV_SB(sb);
1c5b4541	104	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
1da177e4 LT	105
	106	buf->f_type = sb->s_magic;
	107	buf->f_bsize = sb->s_blocksize;
	108	buf->f_blocks = sbi->s_ndatazones;
	109	buf->f_bavail = buf->f_bfree = sysv_count_free_blocks(sb);
	110	buf->f_files = sbi->s_ninodes;
	111	buf->f_ffree = sysv_count_free_inodes(sb);
	112	buf->f_namelen = SYSV_NAMELEN;
1c5b4541 CL	113	buf->f_fsid.val[0] = (u32)id;
1c5b4541 CL	114	buf->f_fsid.val[1] = (u32)(id >> 32);
1da177e4 LT	115	return 0;
	116	}
	117
	118	/*
	119	* NXI <-> N0XI for PDP, XIN <-> XIN0 for le32, NIX <-> 0NIX for be32
	120	*/
	121	static inline void read3byte(struct sysv_sb_info *sbi,
	122	unsigned char * from, unsigned char * to)
	123	{
	124	if (sbi->s_bytesex == BYTESEX_PDP) {
	125	to[0] = from[0];
	126	to[1] = 0;
	127	to[2] = from[1];
	128	to[3] = from[2];
	129	} else if (sbi->s_bytesex == BYTESEX_LE) {
	130	to[0] = from[0];
	131	to[1] = from[1];
	132	to[2] = from[2];
	133	to[3] = 0;
	134	} else {
	135	to[0] = 0;
	136	to[1] = from[0];
	137	to[2] = from[1];
	138	to[3] = from[2];
	139	}
	140	}
	141
	142	static inline void write3byte(struct sysv_sb_info *sbi,
	143	unsigned char * from, unsigned char * to)
	144	{
	145	if (sbi->s_bytesex == BYTESEX_PDP) {
	146	to[0] = from[0];
	147	to[1] = from[2];
	148	to[2] = from[3];
	149	} else if (sbi->s_bytesex == BYTESEX_LE) {
	150	to[0] = from[0];
	151	to[1] = from[1];
	152	to[2] = from[2];
	153	} else {
	154	to[0] = from[1];
	155	to[1] = from[2];
	156	to[2] = from[3];
	157	}
	158	}
	159
c5ef1c42	160	static const struct inode_operations sysv_symlink_inode_operations = {
1da177e4 LT	161	.readlink = generic_readlink,
	162	.follow_link = page_follow_link_light,
	163	.put_link = page_put_link,
	164	.getattr = sysv_getattr,
	165	};
	166
	167	void sysv_set_inode(struct inode *inode, dev_t rdev)
	168	{
	169	if (S_ISREG(inode->i_mode)) {
	170	inode->i_op = &sysv_file_inode_operations;
	171	inode->i_fop = &sysv_file_operations;
	172	inode->i_mapping->a_ops = &sysv_aops;
	173	} else if (S_ISDIR(inode->i_mode)) {
	174	inode->i_op = &sysv_dir_inode_operations;
	175	inode->i_fop = &sysv_dir_operations;
	176	inode->i_mapping->a_ops = &sysv_aops;
	177	} else if (S_ISLNK(inode->i_mode)) {
	178	if (inode->i_blocks) {
	179	inode->i_op = &sysv_symlink_inode_operations;
	180	inode->i_mapping->a_ops = &sysv_aops;
21acaf8e	181	} else {
1da177e4	182	inode->i_op = &sysv_fast_symlink_inode_operations;
21acaf8e DG	183	nd_terminate_link(SYSV_I(inode)->i_data, inode->i_size,
	184	sizeof(SYSV_I(inode)->i_data) - 1);
	185	}
1da177e4 LT	186	} else
	187	init_special_inode(inode, inode->i_mode, rdev);
	188	}
	189
b8e1343f	190	struct inode sysv_iget(struct super_block sb, unsigned int ino)
1da177e4	191	{
1da177e4 LT	192	struct sysv_sb_info * sbi = SYSV_SB(sb);
	193	struct buffer_head * bh;
	194	struct sysv_inode * raw_inode;
	195	struct sysv_inode_info * si;
b8e1343f DH	196	struct inode *inode;
b8e1343f DH	197	unsigned int block;
1da177e4 LT	198
	199	if (!ino \|\| ino > sbi->s_ninodes) {
	200	printk("Bad inode number on dev %s: %d is out of range\n",
b8e1343f DH	201	sb->s_id, ino);
b8e1343f DH	202	return ERR_PTR(-EIO);
1da177e4	203	}
b8e1343f DH	204
	205	inode = iget_locked(sb, ino);
	206	if (!inode)
	207	return ERR_PTR(-ENOMEM);
	208	if (!(inode->i_state & I_NEW))
	209	return inode;
	210
1da177e4 LT	211	raw_inode = sysv_raw_inode(sb, ino, &bh);
	212	if (!raw_inode) {
	213	printk("Major problem: unable to read inode from dev %s\n",
	214	inode->i_sb->s_id);
	215	goto bad_inode;
	216	}
	217	/* SystemV FS: kludge permissions if ino==SYSV_ROOT_INO ?? */
	218	inode->i_mode = fs16_to_cpu(sbi, raw_inode->i_mode);
	219	inode->i_uid = (uid_t)fs16_to_cpu(sbi, raw_inode->i_uid);
	220	inode->i_gid = (gid_t)fs16_to_cpu(sbi, raw_inode->i_gid);
	221	inode->i_nlink = fs16_to_cpu(sbi, raw_inode->i_nlink);
	222	inode->i_size = fs32_to_cpu(sbi, raw_inode->i_size);
	223	inode->i_atime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_atime);
	224	inode->i_mtime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_mtime);
	225	inode->i_ctime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_ctime);
	226	inode->i_ctime.tv_nsec = 0;
	227	inode->i_atime.tv_nsec = 0;
	228	inode->i_mtime.tv_nsec = 0;
ba52de12	229	inode->i_blocks = 0;
1da177e4 LT	230
	231	si = SYSV_I(inode);
	232	for (block = 0; block < 10+1+1+1; block++)
	233	read3byte(sbi, &raw_inode->i_data[3*block],
	234	(u8 *)&si->i_data[block]);
	235	brelse(bh);
	236	si->i_dir_start_lookup = 0;
	237	if (S_ISCHR(inode->i_mode) \|\| S_ISBLK(inode->i_mode))
	238	sysv_set_inode(inode,
	239	old_decode_dev(fs32_to_cpu(sbi, si->i_data[0])));
	240	else
	241	sysv_set_inode(inode, 0);
b8e1343f DH	242	unlock_new_inode(inode);
b8e1343f DH	243	return inode;
1da177e4 LT	244
1da177e4 LT	245	bad_inode:
b8e1343f DH	246	iget_failed(inode);
b8e1343f DH	247	return ERR_PTR(-EIO);
1da177e4 LT	248	}
1da177e4 LT	249
a9185b41	250	static int __sysv_write_inode(struct inode *inode, int wait)
1da177e4 LT	251	{
	252	struct super_block * sb = inode->i_sb;
	253	struct sysv_sb_info * sbi = SYSV_SB(sb);
	254	struct buffer_head * bh;
	255	struct sysv_inode * raw_inode;
	256	struct sysv_inode_info * si;
	257	unsigned int ino, block;
05459ca8	258	int err = 0;
1da177e4 LT	259
	260	ino = inode->i_ino;
	261	if (!ino \|\| ino > sbi->s_ninodes) {
	262	printk("Bad inode number on dev %s: %d is out of range\n",
	263	inode->i_sb->s_id, ino);
05459ca8	264	return -EIO;
1da177e4 LT	265	}
	266	raw_inode = sysv_raw_inode(sb, ino, &bh);
	267	if (!raw_inode) {
	268	printk("unable to read i-node block\n");
05459ca8	269	return -EIO;
1da177e4 LT	270	}
	271
	272	raw_inode->i_mode = cpu_to_fs16(sbi, inode->i_mode);
	273	raw_inode->i_uid = cpu_to_fs16(sbi, fs_high2lowuid(inode->i_uid));
	274	raw_inode->i_gid = cpu_to_fs16(sbi, fs_high2lowgid(inode->i_gid));
	275	raw_inode->i_nlink = cpu_to_fs16(sbi, inode->i_nlink);
	276	raw_inode->i_size = cpu_to_fs32(sbi, inode->i_size);
	277	raw_inode->i_atime = cpu_to_fs32(sbi, inode->i_atime.tv_sec);
	278	raw_inode->i_mtime = cpu_to_fs32(sbi, inode->i_mtime.tv_sec);
	279	raw_inode->i_ctime = cpu_to_fs32(sbi, inode->i_ctime.tv_sec);
	280
	281	si = SYSV_I(inode);
	282	if (S_ISCHR(inode->i_mode) \|\| S_ISBLK(inode->i_mode))
	283	si->i_data[0] = cpu_to_fs32(sbi, old_encode_dev(inode->i_rdev));
	284	for (block = 0; block < 10+1+1+1; block++)
	285	write3byte(sbi, (u8 *)&si->i_data[block],
	286	&raw_inode->i_data[3*block]);
	287	mark_buffer_dirty(bh);
05459ca8 AV	288	if (wait) {
	289	sync_dirty_buffer(bh);
	290	if (buffer_req(bh) && !buffer_uptodate(bh)) {
	291	printk ("IO error syncing sysv inode [%s:%08x]\n",
	292	sb->s_id, ino);
	293	err = -EIO;
	294	}
	295	}
1da177e4	296	brelse(bh);
1da177e4 LT	297	return 0;
	298	}
	299
a9185b41 CH	300	int sysv_write_inode(struct inode inode, struct writeback_control wbc)
	301	{
	302	return __sysv_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
	303	}
	304
05459ca8	305	int sysv_sync_inode(struct inode *inode)
1da177e4	306	{
a9185b41	307	return __sysv_write_inode(inode, 1);
1da177e4 LT	308	}
	309
	310	static void sysv_delete_inode(struct inode *inode)
	311	{
fef26658	312	truncate_inode_pages(&inode->i_data, 0);
1da177e4 LT	313	inode->i_size = 0;
1da177e4 LT	314	sysv_truncate(inode);
1da177e4	315	sysv_free_inode(inode);
1da177e4 LT	316	}
1da177e4 LT	317
e18b890b	318	static struct kmem_cache *sysv_inode_cachep;
1da177e4 LT	319
	320	static struct inode sysv_alloc_inode(struct super_block sb)
	321	{
	322	struct sysv_inode_info *si;
	323
e94b1766	324	si = kmem_cache_alloc(sysv_inode_cachep, GFP_KERNEL);
1da177e4 LT	325	if (!si)
	326	return NULL;
	327	return &si->vfs_inode;
	328	}
	329
	330	static void sysv_destroy_inode(struct inode *inode)
	331	{
	332	kmem_cache_free(sysv_inode_cachep, SYSV_I(inode));
	333	}
	334
51cc5068	335	static void init_once(void *p)
1da177e4 LT	336	{
	337	struct sysv_inode_info si = (struct sysv_inode_info )p;
	338
a35afb83	339	inode_init_once(&si->vfs_inode);
1da177e4 LT	340	}
1da177e4 LT	341
ee9b6d61	342	const struct super_operations sysv_sops = {
1da177e4 LT	343	.alloc_inode = sysv_alloc_inode,
1da177e4 LT	344	.destroy_inode = sysv_destroy_inode,
1da177e4 LT	345	.write_inode = sysv_write_inode,
	346	.delete_inode = sysv_delete_inode,
	347	.put_super = sysv_put_super,
	348	.write_super = sysv_write_super,
ad43ffde	349	.sync_fs = sysv_sync_fs,
1da177e4 LT	350	.remount_fs = sysv_remount,
	351	.statfs = sysv_statfs,
	352	};
	353
	354	int __init sysv_init_icache(void)
	355	{
	356	sysv_inode_cachep = kmem_cache_create("sysv_inode_cache",
	357	sizeof(struct sysv_inode_info), 0,
4b6a9316	358	SLAB_RECLAIM_ACCOUNT\|SLAB_MEM_SPREAD,
20c2df83	359	init_once);
1da177e4 LT	360	if (!sysv_inode_cachep)
	361	return -ENOMEM;
	362	return 0;
	363	}
	364
	365	void sysv_destroy_icache(void)
	366	{
	367	kmem_cache_destroy(sysv_inode_cachep);
	368	}