[deliverable/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/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;

	mutex_lock(&sbi->s_lock);

	/*
	 * 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);
	}

	mutex_unlock(&sbi->s_lock);

	return 0;
}

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;
	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);
	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);
	i_uid_write(inode, (uid_t)fs16_to_cpu(sbi, raw_inode->i_uid));
	i_gid_write(inode, (gid_t)fs16_to_cpu(sbi, raw_inode->i_gid));
	set_nlink(inode, 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(i_uid_read(inode)));
	raw_inode->i_gid = cpu_to_fs16(sbi, fs_high2lowgid(i_gid_read(inode)));
	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_evict_inode(struct inode *inode)
{
	truncate_inode_pages_final(&inode->i_data);
	if (!inode->i_nlink) {
		inode->i_size = 0;
		sysv_truncate(inode);
	}
	invalidate_inode_buffers(inode);
	clear_inode(inode);
	if (!inode->i_nlink)
		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_i_callback(struct rcu_head *head)
{
	struct inode *inode = container_of(head, struct inode, i_rcu);
	kmem_cache_free(sysv_inode_cachep, SYSV_I(inode));
}

static void sysv_destroy_inode(struct inode *inode)
{
	call_rcu(&inode->i_rcu, sysv_i_callback);
}

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,
	.evict_inode	= sysv_evict_inode,
	.put_super	= sysv_put_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)
{
	/*
	 * Make sure all delayed rcu free inodes are flushed before we
	 * destroy cache.
	 */
	rcu_barrier();
	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
c07cb01c	39	mutex_lock(&sbi->s_lock);
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
c07cb01c	54	mutex_unlock(&sbi->s_lock);
ad43ffde CH	55
	56	return 0;
	57	}
	58
1da177e4 LT	59	static int sysv_remount(struct super_block sb, int flags, char *data)
	60	{
	61	struct sysv_sb_info *sbi = SYSV_SB(sb);
eee45893	62
1da177e4 LT	63	if (sbi->s_forced_ro)
1da177e4 LT	64	*flags \|= MS_RDONLY;
1da177e4 LT	65	return 0;
	66	}
	67
	68	static void sysv_put_super(struct super_block *sb)
	69	{
	70	struct sysv_sb_info *sbi = SYSV_SB(sb);
	71
	72	if (!(sb->s_flags & MS_RDONLY)) {
	73	/* XXX ext2 also updates the state here */
	74	mark_buffer_dirty(sbi->s_bh1);
	75	if (sbi->s_bh1 != sbi->s_bh2)
	76	mark_buffer_dirty(sbi->s_bh2);
	77	}
	78
	79	brelse(sbi->s_bh1);
	80	if (sbi->s_bh1 != sbi->s_bh2)
	81	brelse(sbi->s_bh2);
	82
	83	kfree(sbi);
	84	}
	85
726c3342	86	static int sysv_statfs(struct dentry dentry, struct kstatfs buf)
1da177e4	87	{
726c3342	88	struct super_block *sb = dentry->d_sb;
1da177e4	89	struct sysv_sb_info *sbi = SYSV_SB(sb);
1c5b4541	90	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
1da177e4 LT	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;
1c5b4541 CL	99	buf->f_fsid.val[0] = (u32)id;
1c5b4541 CL	100	buf->f_fsid.val[1] = (u32)(id >> 32);
1da177e4 LT	101	return 0;
	102	}
	103
	104	/*
	105	* NXI <-> N0XI for PDP, XIN <-> XIN0 for le32, NIX <-> 0NIX for be32
	106	*/
	107	static inline void read3byte(struct sysv_sb_info *sbi,
	108	unsigned char * from, unsigned char * to)
	109	{
	110	if (sbi->s_bytesex == BYTESEX_PDP) {
	111	to[0] = from[0];
	112	to[1] = 0;
	113	to[2] = from[1];
	114	to[3] = from[2];
	115	} else if (sbi->s_bytesex == BYTESEX_LE) {
	116	to[0] = from[0];
	117	to[1] = from[1];
	118	to[2] = from[2];
	119	to[3] = 0;
	120	} else {
	121	to[0] = 0;
	122	to[1] = from[0];
	123	to[2] = from[1];
	124	to[3] = from[2];
	125	}
	126	}
	127
	128	static inline void write3byte(struct sysv_sb_info *sbi,
	129	unsigned char * from, unsigned char * to)
	130	{
	131	if (sbi->s_bytesex == BYTESEX_PDP) {
	132	to[0] = from[0];
	133	to[1] = from[2];
	134	to[2] = from[3];
	135	} else if (sbi->s_bytesex == BYTESEX_LE) {
	136	to[0] = from[0];
	137	to[1] = from[1];
	138	to[2] = from[2];
	139	} else {
	140	to[0] = from[1];
	141	to[1] = from[2];
	142	to[2] = from[3];
	143	}
	144	}
	145
c5ef1c42	146	static const struct inode_operations sysv_symlink_inode_operations = {
1da177e4 LT	147	.readlink = generic_readlink,
	148	.follow_link = page_follow_link_light,
	149	.put_link = page_put_link,
	150	.getattr = sysv_getattr,
	151	};
	152
	153	void sysv_set_inode(struct inode *inode, dev_t rdev)
	154	{
	155	if (S_ISREG(inode->i_mode)) {
	156	inode->i_op = &sysv_file_inode_operations;
	157	inode->i_fop = &sysv_file_operations;
	158	inode->i_mapping->a_ops = &sysv_aops;
	159	} else if (S_ISDIR(inode->i_mode)) {
	160	inode->i_op = &sysv_dir_inode_operations;
	161	inode->i_fop = &sysv_dir_operations;
	162	inode->i_mapping->a_ops = &sysv_aops;
	163	} else if (S_ISLNK(inode->i_mode)) {
	164	if (inode->i_blocks) {
	165	inode->i_op = &sysv_symlink_inode_operations;
	166	inode->i_mapping->a_ops = &sysv_aops;
21acaf8e	167	} else {
1da177e4	168	inode->i_op = &sysv_fast_symlink_inode_operations;
21acaf8e DG	169	nd_terminate_link(SYSV_I(inode)->i_data, inode->i_size,
	170	sizeof(SYSV_I(inode)->i_data) - 1);
	171	}
1da177e4 LT	172	} else
	173	init_special_inode(inode, inode->i_mode, rdev);
	174	}
	175
b8e1343f	176	struct inode sysv_iget(struct super_block sb, unsigned int ino)
1da177e4	177	{
1da177e4 LT	178	struct sysv_sb_info * sbi = SYSV_SB(sb);
	179	struct buffer_head * bh;
	180	struct sysv_inode * raw_inode;
	181	struct sysv_inode_info * si;
b8e1343f DH	182	struct inode *inode;
b8e1343f DH	183	unsigned int block;
1da177e4 LT	184
	185	if (!ino \|\| ino > sbi->s_ninodes) {
	186	printk("Bad inode number on dev %s: %d is out of range\n",
b8e1343f DH	187	sb->s_id, ino);
b8e1343f DH	188	return ERR_PTR(-EIO);
1da177e4	189	}
b8e1343f DH	190
	191	inode = iget_locked(sb, ino);
	192	if (!inode)
	193	return ERR_PTR(-ENOMEM);
	194	if (!(inode->i_state & I_NEW))
	195	return inode;
	196
1da177e4 LT	197	raw_inode = sysv_raw_inode(sb, ino, &bh);
	198	if (!raw_inode) {
	199	printk("Major problem: unable to read inode from dev %s\n",
	200	inode->i_sb->s_id);
	201	goto bad_inode;
	202	}
	203	/* SystemV FS: kludge permissions if ino==SYSV_ROOT_INO ?? */
	204	inode->i_mode = fs16_to_cpu(sbi, raw_inode->i_mode);
a726ecce EB	205	i_uid_write(inode, (uid_t)fs16_to_cpu(sbi, raw_inode->i_uid));
a726ecce EB	206	i_gid_write(inode, (gid_t)fs16_to_cpu(sbi, raw_inode->i_gid));
bfe86848	207	set_nlink(inode, fs16_to_cpu(sbi, raw_inode->i_nlink));
1da177e4 LT	208	inode->i_size = fs32_to_cpu(sbi, raw_inode->i_size);
	209	inode->i_atime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_atime);
	210	inode->i_mtime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_mtime);
	211	inode->i_ctime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_ctime);
	212	inode->i_ctime.tv_nsec = 0;
	213	inode->i_atime.tv_nsec = 0;
	214	inode->i_mtime.tv_nsec = 0;
ba52de12	215	inode->i_blocks = 0;
1da177e4 LT	216
	217	si = SYSV_I(inode);
	218	for (block = 0; block < 10+1+1+1; block++)
	219	read3byte(sbi, &raw_inode->i_data[3*block],
	220	(u8 *)&si->i_data[block]);
	221	brelse(bh);
	222	si->i_dir_start_lookup = 0;
	223	if (S_ISCHR(inode->i_mode) \|\| S_ISBLK(inode->i_mode))
	224	sysv_set_inode(inode,
	225	old_decode_dev(fs32_to_cpu(sbi, si->i_data[0])));
	226	else
	227	sysv_set_inode(inode, 0);
b8e1343f DH	228	unlock_new_inode(inode);
b8e1343f DH	229	return inode;
1da177e4 LT	230
1da177e4 LT	231	bad_inode:
b8e1343f DH	232	iget_failed(inode);
b8e1343f DH	233	return ERR_PTR(-EIO);
1da177e4 LT	234	}
1da177e4 LT	235
a9185b41	236	static int __sysv_write_inode(struct inode *inode, int wait)
1da177e4 LT	237	{
	238	struct super_block * sb = inode->i_sb;
	239	struct sysv_sb_info * sbi = SYSV_SB(sb);
	240	struct buffer_head * bh;
	241	struct sysv_inode * raw_inode;
	242	struct sysv_inode_info * si;
	243	unsigned int ino, block;
05459ca8	244	int err = 0;
1da177e4 LT	245
	246	ino = inode->i_ino;
	247	if (!ino \|\| ino > sbi->s_ninodes) {
	248	printk("Bad inode number on dev %s: %d is out of range\n",
	249	inode->i_sb->s_id, ino);
05459ca8	250	return -EIO;
1da177e4 LT	251	}
	252	raw_inode = sysv_raw_inode(sb, ino, &bh);
	253	if (!raw_inode) {
	254	printk("unable to read i-node block\n");
05459ca8	255	return -EIO;
1da177e4 LT	256	}
	257
	258	raw_inode->i_mode = cpu_to_fs16(sbi, inode->i_mode);
a726ecce EB	259	raw_inode->i_uid = cpu_to_fs16(sbi, fs_high2lowuid(i_uid_read(inode)));
a726ecce EB	260	raw_inode->i_gid = cpu_to_fs16(sbi, fs_high2lowgid(i_gid_read(inode)));
1da177e4 LT	261	raw_inode->i_nlink = cpu_to_fs16(sbi, inode->i_nlink);
	262	raw_inode->i_size = cpu_to_fs32(sbi, inode->i_size);
	263	raw_inode->i_atime = cpu_to_fs32(sbi, inode->i_atime.tv_sec);
	264	raw_inode->i_mtime = cpu_to_fs32(sbi, inode->i_mtime.tv_sec);
	265	raw_inode->i_ctime = cpu_to_fs32(sbi, inode->i_ctime.tv_sec);
	266
	267	si = SYSV_I(inode);
	268	if (S_ISCHR(inode->i_mode) \|\| S_ISBLK(inode->i_mode))
	269	si->i_data[0] = cpu_to_fs32(sbi, old_encode_dev(inode->i_rdev));
	270	for (block = 0; block < 10+1+1+1; block++)
	271	write3byte(sbi, (u8 *)&si->i_data[block],
	272	&raw_inode->i_data[3*block]);
	273	mark_buffer_dirty(bh);
05459ca8 AV	274	if (wait) {
	275	sync_dirty_buffer(bh);
	276	if (buffer_req(bh) && !buffer_uptodate(bh)) {
	277	printk ("IO error syncing sysv inode [%s:%08x]\n",
	278	sb->s_id, ino);
	279	err = -EIO;
	280	}
	281	}
1da177e4	282	brelse(bh);
1da177e4 LT	283	return 0;
	284	}
	285
a9185b41 CH	286	int sysv_write_inode(struct inode inode, struct writeback_control wbc)
	287	{
	288	return __sysv_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
	289	}
	290
05459ca8	291	int sysv_sync_inode(struct inode *inode)
1da177e4	292	{
a9185b41	293	return __sysv_write_inode(inode, 1);
1da177e4 LT	294	}
1da177e4 LT	295
d299eadc	296	static void sysv_evict_inode(struct inode *inode)
1da177e4	297	{
91b0abe3	298	truncate_inode_pages_final(&inode->i_data);
d299eadc AV	299	if (!inode->i_nlink) {
	300	inode->i_size = 0;
	301	sysv_truncate(inode);
	302	}
	303	invalidate_inode_buffers(inode);
dbd5768f	304	clear_inode(inode);
d299eadc AV	305	if (!inode->i_nlink)
d299eadc AV	306	sysv_free_inode(inode);
1da177e4 LT	307	}
1da177e4 LT	308
e18b890b	309	static struct kmem_cache *sysv_inode_cachep;
1da177e4 LT	310
	311	static struct inode sysv_alloc_inode(struct super_block sb)
	312	{
	313	struct sysv_inode_info *si;
	314
e94b1766	315	si = kmem_cache_alloc(sysv_inode_cachep, GFP_KERNEL);
1da177e4 LT	316	if (!si)
	317	return NULL;
	318	return &si->vfs_inode;
	319	}
	320
fa0d7e3d	321	static void sysv_i_callback(struct rcu_head *head)
1da177e4	322	{
fa0d7e3d	323	struct inode *inode = container_of(head, struct inode, i_rcu);
1da177e4 LT	324	kmem_cache_free(sysv_inode_cachep, SYSV_I(inode));
	325	}
	326
fa0d7e3d NP	327	static void sysv_destroy_inode(struct inode *inode)
	328	{
	329	call_rcu(&inode->i_rcu, sysv_i_callback);
	330	}
	331
51cc5068	332	static void init_once(void *p)
1da177e4 LT	333	{
	334	struct sysv_inode_info si = (struct sysv_inode_info )p;
	335
a35afb83	336	inode_init_once(&si->vfs_inode);
1da177e4 LT	337	}
1da177e4 LT	338
ee9b6d61	339	const struct super_operations sysv_sops = {
1da177e4 LT	340	.alloc_inode = sysv_alloc_inode,
1da177e4 LT	341	.destroy_inode = sysv_destroy_inode,
1da177e4	342	.write_inode = sysv_write_inode,
d299eadc	343	.evict_inode = sysv_evict_inode,
1da177e4	344	.put_super = sysv_put_super,
ad43ffde	345	.sync_fs = sysv_sync_fs,
1da177e4 LT	346	.remount_fs = sysv_remount,
	347	.statfs = sysv_statfs,
	348	};
	349
	350	int __init sysv_init_icache(void)
	351	{
	352	sysv_inode_cachep = kmem_cache_create("sysv_inode_cache",
	353	sizeof(struct sysv_inode_info), 0,
4b6a9316	354	SLAB_RECLAIM_ACCOUNT\|SLAB_MEM_SPREAD,
20c2df83	355	init_once);
1da177e4 LT	356	if (!sysv_inode_cachep)
	357	return -ENOMEM;
	358	return 0;
	359	}
	360
	361	void sysv_destroy_icache(void)
	362	{
8c0a8537 KS	363	/*
	364	* Make sure all delayed rcu free inodes are flushed before we
	365	* destroy cache.
	366	*/
	367	rcu_barrier();
1da177e4 LT	368	kmem_cache_destroy(sysv_inode_cachep);
1da177e4 LT	369	}