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historical/gems-kernel.git/source/THIRDPARTY/linux-old/fs/sysv/inode.c

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/*
* 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
*
* This file contains code for allocating/freeing inodes and for read/writing
* the superblock.
*/
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/sysv_fs.h>
#include <linux/stat.h>
#include <linux/string.h>
#include <linux/locks.h>
#include <asm/segment.h>
void _coh_wait_on_inode (struct inode * inode)
{
struct wait_queue wait = { current, NULL };
add_wait_queue(&inode->u.sysv_i.i_wait, &wait);
repeat:
current->state = TASK_UNINTERRUPTIBLE;
if (inode->u.sysv_i.i_lock) {
schedule();
goto repeat;
}
remove_wait_queue(&inode->u.sysv_i.i_wait, &wait);
current->state = TASK_RUNNING;
}
void sysv_put_inode(struct inode *inode)
{
if (inode->i_nlink)
return;
inode->i_size = 0;
sysv_truncate(inode);
sysv_free_inode(inode);
}
static struct super_operations sysv_sops = {
sysv_read_inode,
sysv_notify_change,
sysv_write_inode,
sysv_put_inode,
sysv_put_super,
sysv_write_super,
sysv_statfs,
NULL
};
/* The following functions try to recognize specific filesystems.
* We recognize:
* - Xenix FS by its magic number.
* - SystemV FS by its magic number.
* - Coherent FS by its funny fname/fpack field.
* We discriminate among SystemV4 and SystemV2 FS by the assumption that
* the time stamp is not < 01-01-1980.
*/
static void detected_bs512 (struct super_block *sb)
{
sb->sv_block_size = 512;
sb->sv_block_size_1 = 512-1;
sb->sv_block_size_bits = 9;
sb->sv_block_size_ratio = 2;
sb->sv_block_size_ratio_1 = 2-1;
sb->sv_block_size_ratio_bits = 1;
sb->sv_inodes_per_block = 512/64;
sb->sv_inodes_per_block_1 = 512/64-1;
sb->sv_inodes_per_block_bits = 9-6;
sb->sv_toobig_block = 10 +
(sb->sv_ind_per_block = 512/4) +
(sb->sv_ind_per_block_2 = (512/4)*(512/4)) +
(sb->sv_ind_per_block_3 = (512/4)*(512/4)*(512/4));
sb->sv_ind_per_block_1 = 512/4-1;
sb->sv_ind_per_block_2_1 = (512/4)*(512/4)-1;
sb->sv_ind_per_block_2_bits = 2 *
(sb->sv_ind_per_block_bits = 9-2);
}
static void detected_bs1024 (struct super_block *sb)
{
sb->sv_block_size = 1024;
sb->sv_block_size_1 = 1024-1;
sb->sv_block_size_bits = 10;
sb->sv_block_size_ratio = 1;
sb->sv_block_size_ratio_1 = 1-1;
sb->sv_block_size_ratio_bits = 0;
sb->sv_inodes_per_block = 1024/64;
sb->sv_inodes_per_block_1 = 1024/64-1;
sb->sv_inodes_per_block_bits = 10-6;
sb->sv_toobig_block = 10 +
(sb->sv_ind_per_block = 1024/4) +
(sb->sv_ind_per_block_2 = (1024/4)*(1024/4)) +
(sb->sv_ind_per_block_3 = (1024/4)*(1024/4)*(1024/4));
sb->sv_ind_per_block_1 = 1024/4-1;
sb->sv_ind_per_block_2_1 = (1024/4)*(1024/4)-1;
sb->sv_ind_per_block_2_bits = 2 *
(sb->sv_ind_per_block_bits = 10-2);
}
static const char* detect_xenix (struct super_block *sb, struct buffer_head *bh)
{
struct xenix_super_block * sbd;
sbd = (struct xenix_super_block *) bh->b_data;
if (sbd->s_magic != 0x2b5544)
return NULL;
sb->sv_type = FSTYPE_XENIX;
sb->sv_convert = 0;
sb->sv_kludge_symlinks = 1;
sb->sv_truncate = 1;
sb->sv_link_max = XENIX_LINK_MAX;
sb->sv_fic_size = XENIX_NICINOD;
sb->sv_flc_size = XENIX_NICFREE;
sb->sv_bh = bh;
sb->sv_sbd = (char *) sbd;
sb->sv_sb_fic_count = &sbd->s_ninode;
sb->sv_sb_fic_inodes = &sbd->s_inode[0];
sb->sv_sb_total_free_inodes = &sbd->s_tinode;
sb->sv_sb_flc_count = &sbd->s_nfree;
sb->sv_sb_flc_blocks = &sbd->s_free[0];
sb->sv_sb_total_free_blocks = &sbd->s_tfree;
sb->sv_sb_time = &sbd->s_time;
sb->sv_block_base = 0;
sb->sv_firstinodezone = 2;
sb->sv_firstdatazone = sbd->s_isize;
sb->sv_nzones = sbd->s_fsize;
sb->sv_ndatazones = sb->sv_nzones - sb->sv_firstdatazone;
switch (sbd->s_type) {
case 1: detected_bs512(sb); break;
case 2: detected_bs1024(sb); break;
default: return NULL;
}
return "Xenix";
}
static const char* detect_sysv4 (struct super_block *sb, struct buffer_head *bh)
{
struct sysv4_super_block * sbd;
sbd = (struct sysv4_super_block *) (bh->b_data + BLOCK_SIZE/2);
if (sbd->s_magic != 0xfd187e20)
return NULL;
if (sbd->s_time < 315532800) /* this is likely to happen on SystemV2 FS */
return NULL;
sb->sv_type = FSTYPE_SYSV4;
sb->sv_convert = 0;
sb->sv_kludge_symlinks = 0; /* ?? */
sb->sv_truncate = 1;
sb->sv_link_max = SYSV_LINK_MAX;
sb->sv_fic_size = SYSV_NICINOD;
sb->sv_flc_size = SYSV_NICFREE;
sb->sv_bh = bh;
sb->sv_sbd = (char *) sbd;
sb->sv_sb_fic_count = &sbd->s_ninode;
sb->sv_sb_fic_inodes = &sbd->s_inode[0];
sb->sv_sb_total_free_inodes = &sbd->s_tinode;
sb->sv_sb_flc_count = &sbd->s_nfree;
sb->sv_sb_flc_blocks = &sbd->s_free[0];
sb->sv_sb_total_free_blocks = &sbd->s_tfree;
sb->sv_sb_time = &sbd->s_time;
sb->sv_block_base = 0;
sb->sv_firstinodezone = 2;
sb->sv_firstdatazone = sbd->s_isize;
sb->sv_nzones = sbd->s_fsize;
sb->sv_ndatazones = sb->sv_nzones - sb->sv_firstdatazone;
switch (sbd->s_type) {
case 1: detected_bs512(sb); break;
case 2: detected_bs1024(sb); break;
default: return NULL;
}
return "SystemV";
}
static const char* detect_sysv2 (struct super_block *sb, struct buffer_head *bh)
{
struct sysv2_super_block * sbd;
sbd = (struct sysv2_super_block *) (bh->b_data + BLOCK_SIZE/2);
if (sbd->s_magic != 0xfd187e20)
return NULL;
if (sbd->s_time < 315532800) /* this is likely to happen on SystemV4 FS */
return NULL;
sb->sv_type = FSTYPE_SYSV2;
sb->sv_convert = 0;
sb->sv_kludge_symlinks = 0; /* ?? */
sb->sv_truncate = 1;
sb->sv_link_max = SYSV_LINK_MAX;
sb->sv_fic_size = SYSV_NICINOD;
sb->sv_flc_size = SYSV_NICFREE;
sb->sv_bh = bh;
sb->sv_sbd = (char *) sbd;
sb->sv_sb_fic_count = &sbd->s_ninode;
sb->sv_sb_fic_inodes = &sbd->s_inode[0];
sb->sv_sb_total_free_inodes = &sbd->s_tinode;
sb->sv_sb_flc_count = &sbd->s_nfree;
sb->sv_sb_flc_blocks = &sbd->s_free[0];
sb->sv_sb_total_free_blocks = &sbd->s_tfree;
sb->sv_sb_time = &sbd->s_time;
sb->sv_block_base = 0;
sb->sv_firstinodezone = 2;
sb->sv_firstdatazone = sbd->s_isize;
sb->sv_nzones = sbd->s_fsize;
sb->sv_ndatazones = sb->sv_nzones - sb->sv_firstdatazone;
switch (sbd->s_type) {
case 1: detected_bs512(sb); break;
case 2: detected_bs1024(sb); break;
default: return NULL;
}
return "SystemV Release 2";
}
static const char* detect_coherent (struct super_block *sb, struct buffer_head *bh)
{
struct coh_super_block * sbd;
sbd = (struct coh_super_block *) (bh->b_data + BLOCK_SIZE/2);
if ((memcmp(sbd->s_fname,"noname",6) && memcmp(sbd->s_fname,"xxxxx ",6))
|| (memcmp(sbd->s_fpack,"nopack",6) && memcmp(sbd->s_fpack,"xxxxx\n",6)))
return NULL;
sb->sv_type = FSTYPE_COH;
sb->sv_convert = 1;
sb->sv_kludge_symlinks = 1;
sb->sv_truncate = 1;
sb->sv_link_max = COH_LINK_MAX;
sb->sv_fic_size = COH_NICINOD;
sb->sv_flc_size = COH_NICFREE;
sb->sv_bh = bh;
sb->sv_sbd = (char *) sbd;
sb->sv_sb_fic_count = &sbd->s_ninode;
sb->sv_sb_fic_inodes = &sbd->s_inode[0];
sb->sv_sb_total_free_inodes = &sbd->s_tinode;
sb->sv_sb_flc_count = &sbd->s_nfree;
sb->sv_sb_flc_blocks = &sbd->s_free[0];
sb->sv_sb_total_free_blocks = &sbd->s_tfree;
sb->sv_sb_time = &sbd->s_time;
sb->sv_block_base = 0;
sb->sv_firstinodezone = 2;
sb->sv_firstdatazone = sbd->s_isize;
sb->sv_nzones = from_coh_ulong(sbd->s_fsize);
sb->sv_ndatazones = sb->sv_nzones - sb->sv_firstdatazone;
detected_bs512(sb);
return "Coherent";
}
struct super_block *sysv_read_super(struct super_block *sb,void *data,
int silent)
{
struct buffer_head *bh;
const char *found;
int dev = sb->s_dev;
if (1024 != sizeof (struct xenix_super_block))
panic("Xenix FS: bad super-block size");
if ((512 != sizeof (struct sysv4_super_block))
|| (512 != sizeof (struct sysv2_super_block)))
panic("SystemV FS: bad super-block size");
if (500 != sizeof (struct coh_super_block))
panic("Coherent FS: bad super-block size");
if (64 != sizeof (struct sysv_inode))
panic("sysv fs: bad i-node size");
lock_super(sb);
sb->s_blocksize = BLOCK_SIZE; /* anything else not supported by the block device drivers */
sb->s_blocksize_bits = BLOCK_SIZE_BITS;
/* Try to read Xenix superblock */
if ((bh = bread(dev, 1, BLOCK_SIZE)) != NULL) {
if ((found = detect_xenix(sb,bh)) != NULL)
goto ok;
brelse(bh);
}
if ((bh = bread(dev, 0, BLOCK_SIZE)) != NULL) {
/* Try to recognize SystemV superblock */
if ((found = detect_sysv4(sb,bh)) != NULL)
goto ok;
if ((found = detect_sysv2(sb,bh)) != NULL)
goto ok;
/* Try to recognize Coherent superblock */
if ((found = detect_coherent(sb,bh)) != NULL)
goto ok;
brelse(bh);
}
/* Try to recognize SystemV2 superblock */
/* Offset by 1 track, i.e. most probably 9, 15, or 18 kilobytes. */
{ static int offsets[] = { 9, 15, 18, };
int i;
for (i = 0; i < sizeof(offsets)/sizeof(offsets[0]); i++)
if ((bh = bread(dev, offsets[i], BLOCK_SIZE)) != NULL) {
/* Try to recognize SystemV superblock */
if ((found = detect_sysv2(sb,bh)) != NULL) {
sb->sv_block_base = offsets[i];
goto ok;
}
brelse(bh);
}
}
sb->s_dev=0;
unlock_super(sb);
if (!silent)
printk("VFS: unable to read Xenix/SystemV/Coherent superblock on device %d/%d\n",MAJOR(dev),MINOR(dev));
return NULL;
ok:
sb->sv_ninodes = (sb->sv_firstdatazone - sb->sv_firstinodezone) << sb->sv_inodes_per_block_bits;
if (!silent)
printk("VFS: Found a %s FS (block size = %d) on device %d/%d\n",found,sb->sv_block_size,MAJOR(dev),MINOR(dev));
sb->s_magic = SYSV_MAGIC_BASE + sb->sv_type;
/* set up enough so that it can read an inode */
sb->s_dev = dev;
sb->s_op = &sysv_sops;
sb->s_mounted = iget(sb,SYSV_ROOT_INO);
unlock_super(sb);
if (!sb->s_mounted) {
brelse(bh);
sb->s_dev = 0;
printk("SysV FS: get root inode failed\n");
return NULL;
}
sb->s_dirt = 1; /* brelse(bh); occurs when the disk is unmounted. */
return sb;
}
/* This is only called on sync() and umount(), when s_dirt=1. */
void sysv_write_super (struct super_block *sb)
{
lock_super(sb);
if (sb->sv_bh->b_dirt) {
/* If we are going to write out the super block,
then attach current time stamp. */
unsigned long time = CURRENT_TIME;
if (sb->sv_convert)
time = to_coh_ulong(time);
*sb->sv_sb_time = time;
}
sb->s_dirt = 0;
unlock_super(sb);
}
void sysv_put_super(struct super_block *sb)
{
/* we can assume sysv_write_super() has already been called */
lock_super(sb);
brelse(sb->sv_bh);
sb->s_dev = 0;
unlock_super(sb);
}
void sysv_statfs(struct super_block *sb, struct statfs *buf)
{
long tmp;
put_fs_long(sb->s_magic, &buf->f_type); /* type of filesystem */
put_fs_long(sb->sv_block_size, &buf->f_bsize); /* block size */
put_fs_long(sb->sv_ndatazones, &buf->f_blocks); /* total data blocks in file system */
tmp = sysv_count_free_blocks(sb);
put_fs_long(tmp, &buf->f_bfree); /* free blocks in fs */
put_fs_long(tmp, &buf->f_bavail); /* free blocks available to non-superuser */
put_fs_long(sb->sv_ninodes, &buf->f_files); /* total file nodes in file system */
put_fs_long(sysv_count_free_inodes(sb), &buf->f_ffree); /* free file nodes in fs */
put_fs_long(SYSV_NAMELEN, &buf->f_namelen);
/* Don't know what value to put in buf->f_fsid */ /* file system id */
}
/* bmap support for running executables and shared libraries.
Used only if block_size = BLOCK_SIZE. */
#define IND_PER_BLOCK (BLOCK_SIZE / sizeof(sysv_zone_t))
static inline int inode_bmap(struct super_block * sb, struct inode * inode, int nr)
{
int tmp = inode->u.sysv_i.i_data[nr];
if (!tmp)
return 0;
return tmp + sb->sv_block_base;
}
static int block_bmap(struct super_block * sb, struct buffer_head * bh, int nr, int convert)
{
int tmp;
if (!bh)
return 0;
tmp = ((sysv_zone_t *) bh->b_data) [nr];
if (convert)
tmp = from_coh_ulong(tmp);
brelse(bh);
if (!tmp)
return 0;
return tmp + sb->sv_block_base;
}
int sysv_bmap(struct inode * inode,int block_nr)
{
unsigned int block = block_nr;
struct super_block * sb = inode->i_sb;
int convert;
int i;
struct buffer_head * bh;
if (block < 10)
return inode_bmap(sb,inode,block);
block -= 10;
convert = sb->sv_convert;
if (block < IND_PER_BLOCK) {
i = inode_bmap(sb,inode,10);
if (!i)
return 0;
bh = bread(inode->i_dev,i,BLOCK_SIZE);
return block_bmap(sb,bh,block,convert);
}
block -= IND_PER_BLOCK;
if (block < IND_PER_BLOCK*IND_PER_BLOCK) {
i = inode_bmap(sb,inode,11);
if (!i)
return 0;
bh = bread(inode->i_dev,i,BLOCK_SIZE);
i = block_bmap(sb,bh,block/IND_PER_BLOCK,convert);
if (!i)
return 0;
bh = bread(inode->i_dev,i,BLOCK_SIZE);
return block_bmap(sb,bh,block%IND_PER_BLOCK,convert);
}
block -= IND_PER_BLOCK*IND_PER_BLOCK;
if (block < IND_PER_BLOCK*IND_PER_BLOCK*IND_PER_BLOCK) {
i = inode_bmap(sb,inode,12);
if (!i)
return 0;
bh = bread(inode->i_dev,i,BLOCK_SIZE);
i = block_bmap(sb,bh,block/(IND_PER_BLOCK*IND_PER_BLOCK),convert);
if (!i)
return 0;
bh = bread(inode->i_dev,i,BLOCK_SIZE);
i = block_bmap(sb,bh,(block/IND_PER_BLOCK)%IND_PER_BLOCK,convert);
if (!i)
return 0;
bh = bread(inode->i_dev,i,BLOCK_SIZE);
return block_bmap(sb,bh,block%IND_PER_BLOCK,convert);
}
if ((int)block<0) {
printk("sysv_bmap: block<0");
return 0;
}
printk("sysv_bmap: block>big");
return 0;
}
/* End of bmap support. */
/* Access selected blocks of regular files (or directories) */
static struct buffer_head * inode_getblk(struct inode * inode, int nr, int create, char * *start)
{
struct super_block *sb;
unsigned long tmp;
unsigned long *p;
struct buffer_head * result;
sb = inode->i_sb;
p = inode->u.sysv_i.i_data + nr;
repeat:
tmp = *p;
if (tmp) {
result = getblk(inode->i_dev, (tmp >> sb->sv_block_size_ratio_bits) + sb->sv_block_base, BLOCK_SIZE);
if (tmp == *p) {
*start = result->b_data + ((tmp & sb->sv_block_size_ratio_1) << sb->sv_block_size_bits);
return result;
}
brelse(result);
goto repeat;
}
if (!create)
return NULL;
tmp = sysv_new_block(sb);
if (!tmp)
return NULL;
result = getblk(inode->i_dev, (tmp >> sb->sv_block_size_ratio_bits) + sb->sv_block_base, BLOCK_SIZE);
if (*p) {
sysv_free_block(sb,tmp);
brelse(result);
goto repeat;
}
*p = tmp;
inode->i_ctime = CURRENT_TIME;
inode->i_dirt = 1;
*start = result->b_data + ((tmp & sb->sv_block_size_ratio_1) << sb->sv_block_size_bits);
return result;
}
static struct buffer_head * block_getblk(struct inode * inode,
struct buffer_head * bh, int nr, int create, char * *start)
{
struct super_block *sb;
unsigned long tmp, block;
sysv_zone_t *p;
struct buffer_head * result;
if (!bh)
return NULL;
if (!bh->b_uptodate) {
ll_rw_block(READ, 1, &bh);
wait_on_buffer(bh);
if (!bh->b_uptodate) {
brelse(bh);
return NULL;
}
}
sb = inode->i_sb;
p = nr + (sysv_zone_t *) *start;
repeat:
block = tmp = *p;
if (sb->sv_convert)
block = from_coh_ulong(block);
if (tmp) {
result = getblk(bh->b_dev, (block >> sb->sv_block_size_ratio_bits) + sb->sv_block_base, BLOCK_SIZE);
if (tmp == *p) {
brelse(bh);
*start = result->b_data + ((block & sb->sv_block_size_ratio_1) << sb->sv_block_size_bits);
return result;
}
brelse(result);
goto repeat;
}
if (!create) {
brelse(bh);
return NULL;
}
block = sysv_new_block(sb);
if (!block) {
brelse(bh);
return NULL;
}
result = getblk(bh->b_dev, (block >> sb->sv_block_size_ratio_bits) + sb->sv_block_base, BLOCK_SIZE);
if (*p) {
sysv_free_block(sb,block);
brelse(result);
goto repeat;
}
*p = (sb->sv_convert ? to_coh_ulong(block) : block);
bh->b_dirt = 1;
brelse(bh);
*start = result->b_data + ((block & sb->sv_block_size_ratio_1) << sb->sv_block_size_bits);
return result;
}
struct buffer_head * sysv_getblk(struct inode * inode, unsigned int block,
int create, char * *start)
{
struct super_block * sb = inode->i_sb;
struct buffer_head * bh;
if (block < 10)
return inode_getblk(inode,block,create,start);
block -= 10;
if (block < sb->sv_ind_per_block) {
bh = inode_getblk(inode,10,create,start);
return block_getblk(inode, bh, block, create, start);
}
block -= sb->sv_ind_per_block;
if (block < sb->sv_ind_per_block_2) {
bh = inode_getblk(inode,11,create,start);
bh = block_getblk(inode, bh, block >> sb->sv_ind_per_block_bits, create, start);
return block_getblk(inode, bh, block & sb->sv_ind_per_block_1, create, start);
}
block -= sb->sv_ind_per_block_2;
if (block < sb->sv_ind_per_block_3) {
bh = inode_getblk(inode,12,create,start);
bh = block_getblk(inode, bh, block >> sb->sv_ind_per_block_2_bits, create, start);
bh = block_getblk(inode, bh, (block >> sb->sv_ind_per_block_bits) & sb->sv_ind_per_block_1, create, start);
return block_getblk(inode, bh, block & sb->sv_ind_per_block_1, create, start);
}
if ((int)block<0) {
printk("sysv_getblk: block<0");
return NULL;
}
printk("sysv_getblk: block>big");
return NULL;
}
struct buffer_head * sysv_file_bread(struct inode * inode, int block, int create, char * *start)
{
struct buffer_head * bh;
bh = sysv_getblk(inode,block,create,start);
if (!bh || bh->b_uptodate)
return bh;
ll_rw_block(READ, 1, &bh);
wait_on_buffer(bh);
if (bh->b_uptodate)
return bh;
brelse(bh);
return NULL;
}
static inline unsigned long read3byte (char * p)
{
return (unsigned long)(*(unsigned short *)p)
| (unsigned long)(*(unsigned char *)(p+2)) << 16;
}
static inline void write3byte (char * p, unsigned long val)
{
*(unsigned short *)p = (unsigned short) val;
*(unsigned char *)(p+2) = val >> 16;
}
static inline unsigned long coh_read3byte (char * p)
{
return (unsigned long)(*(unsigned char *)p) << 16
| (unsigned long)(*(unsigned short *)(p+1));
}
static inline void coh_write3byte (char * p, unsigned long val)
{
*(unsigned char *)p = val >> 16;
*(unsigned short *)(p+1) = (unsigned short) val;
}
void sysv_read_inode(struct inode * inode)
{
struct super_block * sb = inode->i_sb;
struct buffer_head * bh;
char * bh_data;
struct sysv_inode * raw_inode;
unsigned int block, ino;
umode_t mode;
ino = inode->i_ino;
inode->i_op = NULL;
inode->i_mode = 0;
if (!ino || ino > sb->sv_ninodes) {
printk("Bad inode number on dev 0x%04x: %d is out of range\n",
inode->i_dev, ino);
return;
}
block = sb->sv_firstinodezone + ((ino-1) >> sb->sv_inodes_per_block_bits);
if (!(bh=sysv_bread(sb,inode->i_dev,block,&bh_data))) {
printk("Major problem: unable to read inode from dev 0x%04x\n",
inode->i_dev);
return;
}
raw_inode = (struct sysv_inode *) bh_data + ((ino-1) & sb->sv_inodes_per_block_1);
mode = raw_inode->i_mode;
if (sb->sv_kludge_symlinks)
mode = from_coh_imode(mode);
/* SystemV FS: kludge permissions if ino==SYSV_ROOT_INO ?? */
inode->i_mode = mode;
inode->i_uid = raw_inode->i_uid;
inode->i_gid = raw_inode->i_gid;
inode->i_nlink = raw_inode->i_nlink;
if (sb->sv_convert) {
inode->i_size = from_coh_ulong(raw_inode->i_size);
inode->i_atime = from_coh_ulong(raw_inode->i_atime);
inode->i_mtime = from_coh_ulong(raw_inode->i_mtime);
inode->i_ctime = from_coh_ulong(raw_inode->i_ctime);
} else {
inode->i_size = raw_inode->i_size;
inode->i_atime = raw_inode->i_atime;
inode->i_mtime = raw_inode->i_mtime;
inode->i_ctime = raw_inode->i_ctime;
}
inode->i_blocks = inode->i_blksize = 0;
if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
inode->i_rdev = raw_inode->i_a.i_rdev;
else
if (sb->sv_convert)
for (block = 0; block < 10+1+1+1; block++)
inode->u.sysv_i.i_data[block] =
coh_read3byte(&raw_inode->i_a.i_addb[3*block]);
else
for (block = 0; block < 10+1+1+1; block++)
inode->u.sysv_i.i_data[block] =
read3byte(&raw_inode->i_a.i_addb[3*block]);
brelse(bh);
if (S_ISREG(inode->i_mode))
if (sb->sv_block_size_ratio_bits == 0) /* block_size == BLOCK_SIZE ? */
inode->i_op = &sysv_file_inode_operations_with_bmap;
else
inode->i_op = &sysv_file_inode_operations;
else if (S_ISDIR(inode->i_mode))
inode->i_op = &sysv_dir_inode_operations;
else if (S_ISLNK(inode->i_mode))
inode->i_op = &sysv_symlink_inode_operations;
else if (S_ISCHR(inode->i_mode))
inode->i_op = &chrdev_inode_operations;
else if (S_ISBLK(inode->i_mode))
inode->i_op = &blkdev_inode_operations;
else if (S_ISFIFO(inode->i_mode))
init_fifo(inode);
}
/* To avoid inconsistencies between inodes in memory and inodes on disk. */
extern int sysv_notify_change(int flags, struct inode *inode)
{
if (flags & NOTIFY_MODE)
if (inode->i_sb->sv_kludge_symlinks)
if (inode->i_mode == COH_KLUDGE_SYMLINK_MODE) {
inode->i_mode = COH_KLUDGE_NOT_SYMLINK;
inode->i_dirt = 1;
}
return 0;
}
static struct buffer_head * sysv_update_inode(struct inode * inode)
{
struct super_block * sb = inode->i_sb;
struct buffer_head * bh;
char * bh_data;
struct sysv_inode * raw_inode;
unsigned int ino, block;
umode_t mode;
ino = inode->i_ino;
if (!ino || ino > sb->sv_ninodes) {
printk("Bad inode number on dev 0x%04x: %d is out of range\n",
inode->i_dev, ino);
inode->i_dirt = 0;
return 0;
}
block = sb->sv_firstinodezone + ((ino-1) >> sb->sv_inodes_per_block_bits);
if (!(bh = sysv_bread(sb,inode->i_dev,block,&bh_data))) {
printk("unable to read i-node block\n");
inode->i_dirt = 0;
return 0;
}
raw_inode = (struct sysv_inode *) bh_data + ((ino-1) & sb->sv_inodes_per_block_1);
mode = inode->i_mode;
if (sb->sv_kludge_symlinks)
mode = to_coh_imode(mode);
raw_inode->i_mode = mode;
raw_inode->i_uid = inode->i_uid;
raw_inode->i_gid = inode->i_gid;
raw_inode->i_nlink = inode->i_nlink;
if (sb->sv_convert) {
raw_inode->i_size = to_coh_ulong(inode->i_size);
raw_inode->i_atime = to_coh_ulong(inode->i_atime);
raw_inode->i_mtime = to_coh_ulong(inode->i_mtime);
raw_inode->i_ctime = to_coh_ulong(inode->i_ctime);
} else {
raw_inode->i_size = inode->i_size;
raw_inode->i_atime = inode->i_atime;
raw_inode->i_mtime = inode->i_mtime;
raw_inode->i_ctime = inode->i_ctime;
}
if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
raw_inode->i_a.i_rdev = inode->i_rdev; /* write 2 or 3 bytes ?? */
else
if (sb->sv_convert)
for (block = 0; block < 10+1+1+1; block++)
coh_write3byte(&raw_inode->i_a.i_addb[3*block],inode->u.sysv_i.i_data[block]);
else
for (block = 0; block < 10+1+1+1; block++)
write3byte(&raw_inode->i_a.i_addb[3*block],inode->u.sysv_i.i_data[block]);
inode->i_dirt=0;
bh->b_dirt=1;
return bh;
}
void sysv_write_inode(struct inode * inode)
{
struct buffer_head *bh;
bh = sysv_update_inode(inode);
brelse(bh);
}
int sysv_sync_inode(struct inode * inode)
{
int err = 0;
struct buffer_head *bh;
bh = sysv_update_inode(inode);
if (bh && bh->b_dirt) {
ll_rw_block(WRITE, 1, &bh);
wait_on_buffer(bh);
if (bh->b_req && !bh->b_uptodate)
{
printk ("IO error syncing sysv inode [%04x:%08lx]\n",
inode->i_dev, inode->i_ino);
err = -1;
}
}
else if (!bh)
err = -1;
brelse (bh);
return err;
}
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