[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 <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 super_block *sb, struct kstatfs *buf)
{
	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 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 = inode->i_blksize = 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)
{
	inode->i_size = 0;
	sysv_truncate(inode);
	lock_kernel();
	sysv_free_inode(inode);
	unlock_kernel();
}

static kmem_cache_t *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, SLAB_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, kmem_cache_t *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,
			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
88	static int sysv_statfs(struct super_block sb, struct kstatfs buf)
89	{
90	struct sysv_sb_info *sbi = SYSV_SB(sb);
91
92	buf->f_type = sb->s_magic;
93	buf->f_bsize = sb->s_blocksize;
94	buf->f_blocks = sbi->s_ndatazones;
95	buf->f_bavail = buf->f_bfree = sysv_count_free_blocks(sb);
96	buf->f_files = sbi->s_ninodes;
97	buf->f_ffree = sysv_count_free_inodes(sb);
98	buf->f_namelen = SYSV_NAMELEN;
99	return 0;
100	}
101
102	/*
103	* NXI <-> N0XI for PDP, XIN <-> XIN0 for le32, NIX <-> 0NIX for be32
104	*/
105	static inline void read3byte(struct sysv_sb_info *sbi,
106	unsigned char * from, unsigned char * to)
107	{
108	if (sbi->s_bytesex == BYTESEX_PDP) {
109	to[0] = from[0];
110	to[1] = 0;
111	to[2] = from[1];
112	to[3] = from[2];
113	} else if (sbi->s_bytesex == BYTESEX_LE) {
114	to[0] = from[0];
115	to[1] = from[1];
116	to[2] = from[2];
117	to[3] = 0;
118	} else {
119	to[0] = 0;
120	to[1] = from[0];
121	to[2] = from[1];
122	to[3] = from[2];
123	}
124	}
125
126	static inline void write3byte(struct sysv_sb_info *sbi,
127	unsigned char * from, unsigned char * to)
128	{
129	if (sbi->s_bytesex == BYTESEX_PDP) {
130	to[0] = from[0];
131	to[1] = from[2];
132	to[2] = from[3];
133	} else if (sbi->s_bytesex == BYTESEX_LE) {
134	to[0] = from[0];
135	to[1] = from[1];
136	to[2] = from[2];
137	} else {
138	to[0] = from[1];
139	to[1] = from[2];
140	to[2] = from[3];
141	}
142	}
143
144	static struct inode_operations sysv_symlink_inode_operations = {
145	.readlink = generic_readlink,
146	.follow_link = page_follow_link_light,
147	.put_link = page_put_link,
148	.getattr = sysv_getattr,
149	};
150
151	void sysv_set_inode(struct inode *inode, dev_t rdev)
152	{
153	if (S_ISREG(inode->i_mode)) {
154	inode->i_op = &sysv_file_inode_operations;
155	inode->i_fop = &sysv_file_operations;
156	inode->i_mapping->a_ops = &sysv_aops;
157	} else if (S_ISDIR(inode->i_mode)) {
158	inode->i_op = &sysv_dir_inode_operations;
159	inode->i_fop = &sysv_dir_operations;
160	inode->i_mapping->a_ops = &sysv_aops;
161	} else if (S_ISLNK(inode->i_mode)) {
162	if (inode->i_blocks) {
163	inode->i_op = &sysv_symlink_inode_operations;
164	inode->i_mapping->a_ops = &sysv_aops;
165	} else
166	inode->i_op = &sysv_fast_symlink_inode_operations;
167	} else
168	init_special_inode(inode, inode->i_mode, rdev);
169	}
170
171	static void sysv_read_inode(struct inode *inode)
172	{
173	struct super_block * sb = inode->i_sb;
174	struct sysv_sb_info * sbi = SYSV_SB(sb);
175	struct buffer_head * bh;
176	struct sysv_inode * raw_inode;
177	struct sysv_inode_info * si;
178	unsigned int block, ino = inode->i_ino;
179
180	if (!ino \|\| ino > sbi->s_ninodes) {
181	printk("Bad inode number on dev %s: %d is out of range\n",
182	inode->i_sb->s_id, ino);
183	goto bad_inode;
184	}
185	raw_inode = sysv_raw_inode(sb, ino, &bh);
186	if (!raw_inode) {
187	printk("Major problem: unable to read inode from dev %s\n",
188	inode->i_sb->s_id);
189	goto bad_inode;
190	}
191	/* SystemV FS: kludge permissions if ino==SYSV_ROOT_INO ?? */
192	inode->i_mode = fs16_to_cpu(sbi, raw_inode->i_mode);
193	inode->i_uid = (uid_t)fs16_to_cpu(sbi, raw_inode->i_uid);
194	inode->i_gid = (gid_t)fs16_to_cpu(sbi, raw_inode->i_gid);
195	inode->i_nlink = fs16_to_cpu(sbi, raw_inode->i_nlink);
196	inode->i_size = fs32_to_cpu(sbi, raw_inode->i_size);
197	inode->i_atime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_atime);
198	inode->i_mtime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_mtime);
199	inode->i_ctime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_ctime);
200	inode->i_ctime.tv_nsec = 0;
201	inode->i_atime.tv_nsec = 0;
202	inode->i_mtime.tv_nsec = 0;
203	inode->i_blocks = inode->i_blksize = 0;
204
205	si = SYSV_I(inode);
206	for (block = 0; block < 10+1+1+1; block++)
207	read3byte(sbi, &raw_inode->i_data[3*block],
208	(u8 *)&si->i_data[block]);
209	brelse(bh);
210	si->i_dir_start_lookup = 0;
211	if (S_ISCHR(inode->i_mode) \|\| S_ISBLK(inode->i_mode))
212	sysv_set_inode(inode,
213	old_decode_dev(fs32_to_cpu(sbi, si->i_data[0])));
214	else
215	sysv_set_inode(inode, 0);
216	return;
217
218	bad_inode:
219	make_bad_inode(inode);
220	return;
221	}
222
223	static struct buffer_head * sysv_update_inode(struct inode * inode)
224	{
225	struct super_block * sb = inode->i_sb;
226	struct sysv_sb_info * sbi = SYSV_SB(sb);
227	struct buffer_head * bh;
228	struct sysv_inode * raw_inode;
229	struct sysv_inode_info * si;
230	unsigned int ino, block;
231
232	ino = inode->i_ino;
233	if (!ino \|\| ino > sbi->s_ninodes) {
234	printk("Bad inode number on dev %s: %d is out of range\n",
235	inode->i_sb->s_id, ino);
236	return NULL;
237	}
238	raw_inode = sysv_raw_inode(sb, ino, &bh);
239	if (!raw_inode) {
240	printk("unable to read i-node block\n");
241	return NULL;
242	}
243
244	raw_inode->i_mode = cpu_to_fs16(sbi, inode->i_mode);
245	raw_inode->i_uid = cpu_to_fs16(sbi, fs_high2lowuid(inode->i_uid));
246	raw_inode->i_gid = cpu_to_fs16(sbi, fs_high2lowgid(inode->i_gid));
247	raw_inode->i_nlink = cpu_to_fs16(sbi, inode->i_nlink);
248	raw_inode->i_size = cpu_to_fs32(sbi, inode->i_size);
249	raw_inode->i_atime = cpu_to_fs32(sbi, inode->i_atime.tv_sec);
250	raw_inode->i_mtime = cpu_to_fs32(sbi, inode->i_mtime.tv_sec);
251	raw_inode->i_ctime = cpu_to_fs32(sbi, inode->i_ctime.tv_sec);
252
253	si = SYSV_I(inode);
254	if (S_ISCHR(inode->i_mode) \|\| S_ISBLK(inode->i_mode))
255	si->i_data[0] = cpu_to_fs32(sbi, old_encode_dev(inode->i_rdev));
256	for (block = 0; block < 10+1+1+1; block++)
257	write3byte(sbi, (u8 *)&si->i_data[block],
258	&raw_inode->i_data[3*block]);
259	mark_buffer_dirty(bh);
260	return bh;
261	}
262
263	int sysv_write_inode(struct inode * inode, int wait)
264	{
265	struct buffer_head *bh;
266	lock_kernel();
267	bh = sysv_update_inode(inode);
268	brelse(bh);
269	unlock_kernel();
270	return 0;
271	}
272
273	int sysv_sync_inode(struct inode * inode)
274	{
275	int err = 0;
276	struct buffer_head *bh;
277
278	bh = sysv_update_inode(inode);
279	if (bh && buffer_dirty(bh)) {
280	sync_dirty_buffer(bh);
281	if (buffer_req(bh) && !buffer_uptodate(bh)) {
282	printk ("IO error syncing sysv inode [%s:%08lx]\n",
283	inode->i_sb->s_id, inode->i_ino);
284	err = -1;
285	}
286	}
287	else if (!bh)
288	err = -1;
289	brelse (bh);
290	return err;
291	}
292
293	static void sysv_delete_inode(struct inode *inode)
294	{
295	inode->i_size = 0;
296	sysv_truncate(inode);
297	lock_kernel();
298	sysv_free_inode(inode);
299	unlock_kernel();
300	}
301
302	static kmem_cache_t *sysv_inode_cachep;
303
304	static struct inode sysv_alloc_inode(struct super_block sb)
305	{
306	struct sysv_inode_info *si;
307
308	si = kmem_cache_alloc(sysv_inode_cachep, SLAB_KERNEL);
309	if (!si)
310	return NULL;
311	return &si->vfs_inode;
312	}
313
314	static void sysv_destroy_inode(struct inode *inode)
315	{
316	kmem_cache_free(sysv_inode_cachep, SYSV_I(inode));
317	}
318
319	static void init_once(void p, kmem_cache_t cachep, unsigned long flags)
320	{
321	struct sysv_inode_info si = (struct sysv_inode_info )p;
322
323	if ((flags & (SLAB_CTOR_VERIFY\|SLAB_CTOR_CONSTRUCTOR)) ==
324	SLAB_CTOR_CONSTRUCTOR)
325	inode_init_once(&si->vfs_inode);
326	}
327
328	struct super_operations sysv_sops = {
329	.alloc_inode = sysv_alloc_inode,
330	.destroy_inode = sysv_destroy_inode,
331	.read_inode = sysv_read_inode,
332	.write_inode = sysv_write_inode,
333	.delete_inode = sysv_delete_inode,
334	.put_super = sysv_put_super,
335	.write_super = sysv_write_super,
336	.remount_fs = sysv_remount,
337	.statfs = sysv_statfs,
338	};
339
340	int __init sysv_init_icache(void)
341	{
342	sysv_inode_cachep = kmem_cache_create("sysv_inode_cache",
343	sizeof(struct sysv_inode_info), 0,
344	SLAB_RECLAIM_ACCOUNT,
345	init_once, NULL);
346	if (!sysv_inode_cachep)
347	return -ENOMEM;
348	return 0;
349	}
350
351	void sysv_destroy_icache(void)
352	{
353	kmem_cache_destroy(sysv_inode_cachep);
354	}