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/*
* linux/fs/minix/fsync.c
*
* Copyright (C) 1993 Stephen Tweedie (sct@dcs.ed.ac.uk)
* from
* Copyright (C) 1991, 1992 Linus Torvalds
*
* Copyright (C) 1996 Gertjan van Wingerde (gertjan@cs.vu.nl)
* Minix V2 fs support
*
* minix fsync primitive
*/
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/stat.h>
#include <linux/fcntl.h>
#include <linux/locks.h>
#include <linux/fs.h>
#include <linux/minix_fs.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#define blocksize BLOCK_SIZE
/*
* The functions for minix V1 fs file synchronization.
*/
static int V1_sync_block (struct inode * inode, unsigned short * block, int wait)
{
struct buffer_head * bh;
unsigned short tmp;
if (!*block)
return 0;
tmp = *block;
bh = get_hash_table(inode->i_dev, *block, blocksize);
if (!bh)
return 0;
if (*block != tmp) {
brelse (bh);
return 1;
}
if (wait && buffer_req(bh) && !buffer_uptodate(bh)) {
brelse(bh);
return -1;
}
if (wait || !buffer_uptodate(bh) || !buffer_dirty(bh))
{
brelse(bh);
return 0;
}
ll_rw_block(WRITE, 1, &bh);
bh->b_count--;
return 0;
}
static int V1_sync_iblock (struct inode * inode, unsigned short * iblock,
struct buffer_head **bh, int wait)
{
int rc;
unsigned short tmp;
*bh = NULL;
tmp = *iblock;
if (!tmp)
return 0;
rc = V1_sync_block (inode, iblock, wait);
if (rc)
return rc;
*bh = bread(inode->i_dev, tmp, blocksize);
if (tmp != *iblock) {
brelse(*bh);
*bh = NULL;
return 1;
}
if (!*bh)
return -1;
return 0;
}
static int V1_sync_direct(struct inode *inode, int wait)
{
int i;
int rc, err = 0;
for (i = 0; i < 7; i++) {
rc = V1_sync_block (inode,
(unsigned short *) inode->u.minix_i.u.i1_data + i, wait);
if (rc > 0)
break;
if (rc)
err = rc;
}
return err;
}
static int V1_sync_indirect(struct inode *inode, unsigned short *iblock, int wait)
{
int i;
struct buffer_head * ind_bh;
int rc, err = 0;
rc = V1_sync_iblock (inode, iblock, &ind_bh, wait);
if (rc || !ind_bh)
return rc;
for (i = 0; i < 512; i++) {
rc = V1_sync_block (inode,
((unsigned short *) ind_bh->b_data) + i,
wait);
if (rc > 0)
break;
if (rc)
err = rc;
}
brelse(ind_bh);
return err;
}
static int V1_sync_dindirect(struct inode *inode, unsigned short *diblock,
int wait)
{
int i;
struct buffer_head * dind_bh;
int rc, err = 0;
rc = V1_sync_iblock (inode, diblock, &dind_bh, wait);
if (rc || !dind_bh)
return rc;
for (i = 0; i < 512; i++) {
rc = V1_sync_indirect (inode,
((unsigned short *) dind_bh->b_data) + i,
wait);
if (rc > 0)
break;
if (rc)
err = rc;
}
brelse(dind_bh);
return err;
}
static int V1_minix_sync_file(struct inode * inode, struct file * file)
{
int wait, err = 0;
if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
S_ISLNK(inode->i_mode)))
return -EINVAL;
for (wait=0; wait<=1; wait++)
{
err |= V1_sync_direct(inode, wait);
err |= V1_sync_indirect(inode, inode->u.minix_i.u.i1_data + 7, wait);
err |= V1_sync_dindirect(inode, inode->u.minix_i.u.i1_data + 8, wait);
}
err |= minix_sync_inode (inode);
return (err < 0) ? -EIO : 0;
}
/*
* The functions for minix V2 fs file synchronization.
*/
static int V2_sync_block (struct inode * inode, unsigned long * block, int wait)
{
struct buffer_head * bh;
unsigned long tmp;
if (!*block)
return 0;
tmp = *block;
bh = get_hash_table(inode->i_dev, *block, blocksize);
if (!bh)
return 0;
if (*block != tmp) {
brelse (bh);
return 1;
}
if (wait && buffer_req(bh) && !buffer_uptodate(bh)) {
brelse(bh);
return -1;
}
if (wait || !buffer_uptodate(bh) || !buffer_dirty(bh))
{
brelse(bh);
return 0;
}
ll_rw_block(WRITE, 1, &bh);
bh->b_count--;
return 0;
}
static int V2_sync_iblock (struct inode * inode, unsigned long * iblock,
struct buffer_head **bh, int wait)
{
int rc;
unsigned long tmp;
*bh = NULL;
tmp = *iblock;
if (!tmp)
return 0;
rc = V2_sync_block (inode, iblock, wait);
if (rc)
return rc;
*bh = bread(inode->i_dev, tmp, blocksize);
if (tmp != *iblock) {
brelse(*bh);
*bh = NULL;
return 1;
}
if (!*bh)
return -1;
return 0;
}
static int V2_sync_direct(struct inode *inode, int wait)
{
int i;
int rc, err = 0;
for (i = 0; i < 7; i++) {
rc = V2_sync_block (inode,
(unsigned long *)inode->u.minix_i.u.i2_data + i, wait);
if (rc > 0)
break;
if (rc)
err = rc;
}
return err;
}
static int V2_sync_indirect(struct inode *inode, unsigned long *iblock, int wait)
{
int i;
struct buffer_head * ind_bh;
int rc, err = 0;
rc = V2_sync_iblock (inode, iblock, &ind_bh, wait);
if (rc || !ind_bh)
return rc;
for (i = 0; i < 256; i++) {
rc = V2_sync_block (inode,
((unsigned long *) ind_bh->b_data) + i,
wait);
if (rc > 0)
break;
if (rc)
err = rc;
}
brelse(ind_bh);
return err;
}
static int V2_sync_dindirect(struct inode *inode, unsigned long *diblock,
int wait)
{
int i;
struct buffer_head * dind_bh;
int rc, err = 0;
rc = V2_sync_iblock (inode, diblock, &dind_bh, wait);
if (rc || !dind_bh)
return rc;
for (i = 0; i < 256; i++) {
rc = V2_sync_indirect (inode,
((unsigned long *) dind_bh->b_data) + i,
wait);
if (rc > 0)
break;
if (rc)
err = rc;
}
brelse(dind_bh);
return err;
}
static int V2_sync_tindirect(struct inode *inode, unsigned long *tiblock,
int wait)
{
int i;
struct buffer_head * tind_bh;
int rc, err = 0;
rc = V2_sync_iblock (inode, tiblock, &tind_bh, wait);
if (rc || !tind_bh)
return rc;
for (i = 0; i < 256; i++) {
rc = V2_sync_dindirect (inode,
((unsigned long *) tind_bh->b_data) + i,
wait);
if (rc > 0)
break;
if (rc)
err = rc;
}
brelse(tind_bh);
return err;
}
static int V2_minix_sync_file(struct inode * inode, struct file * file)
{
int wait, err = 0;
if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
S_ISLNK(inode->i_mode)))
return -EINVAL;
for (wait=0; wait<=1; wait++)
{
err |= V2_sync_direct(inode, wait);
err |= V2_sync_indirect(inode,
(unsigned long *) inode->u.minix_i.u.i2_data + 7, wait);
err |= V2_sync_dindirect(inode,
(unsigned long *) inode->u.minix_i.u.i2_data + 8, wait);
err |= V2_sync_tindirect(inode,
(unsigned long *) inode->u.minix_i.u.i2_data + 9, wait);
}
err |= minix_sync_inode (inode);
return (err < 0) ? -EIO : 0;
}
/*
* The function which is called for file synchronization. File may be
* NULL
*/
int minix_sync_file(struct file * file, struct dentry *dentry)
{
struct inode *inode = dentry->d_inode;
if (INODE_VERSION(inode) == MINIX_V1)
return V1_minix_sync_file(inode, file);
else
return V2_minix_sync_file(inode, file);
}
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