[linux.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 <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_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);

	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;
	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;
	} else
		init_special_inode(inode, inode->i_mode, rdev);
}

static void sysv_read_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 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);
		goto bad_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);
	return;

bad_inode:
	make_bad_inode(inode);
	return;
}

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 kmem_cache *cachep, unsigned long flags)
{
	struct sysv_inode_info *si = (struct sysv_inode_info *)p;

	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
			SLAB_CTOR_CONSTRUCTOR)
		inode_init_once(&si->vfs_inode);
}

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