171 lines
3.0 KiB
C
171 lines
3.0 KiB
C
/*
|
|
* QNX4 file system, Linux implementation.
|
|
*
|
|
* Version : 0.1
|
|
*
|
|
* Using parts of the xiafs filesystem.
|
|
*
|
|
* History :
|
|
*
|
|
* 24-03-1998 by Richard Frowijn : first release.
|
|
*/
|
|
|
|
#include <linux/config.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/time.h>
|
|
#include <linux/stat.h>
|
|
#include <linux/fcntl.h>
|
|
#include <linux/smp_lock.h>
|
|
#include <linux/buffer_head.h>
|
|
|
|
#include <linux/fs.h>
|
|
#include <linux/qnx4_fs.h>
|
|
|
|
#include <asm/system.h>
|
|
|
|
/*
|
|
* The functions for qnx4 fs file synchronization.
|
|
*/
|
|
|
|
#ifdef CONFIG_QNX4FS_RW
|
|
|
|
static int sync_block(struct inode *inode, unsigned short *block, int wait)
|
|
{
|
|
struct buffer_head *bh;
|
|
unsigned short tmp;
|
|
|
|
if (!*block)
|
|
return 0;
|
|
tmp = *block;
|
|
bh = sb_find_get_block(inode->i_sb, *block);
|
|
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);
|
|
atomic_dec(&bh->b_count);
|
|
return 0;
|
|
}
|
|
|
|
#ifdef WTF
|
|
static int 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 = sync_block(inode, iblock, wait);
|
|
if (rc)
|
|
return rc;
|
|
*bh = sb_bread(inode->i_sb, tmp);
|
|
if (tmp != *iblock) {
|
|
brelse(*bh);
|
|
*bh = NULL;
|
|
return 1;
|
|
}
|
|
if (!*bh)
|
|
return -1;
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static int sync_direct(struct inode *inode, int wait)
|
|
{
|
|
int i;
|
|
int rc, err = 0;
|
|
|
|
for (i = 0; i < 7; i++) {
|
|
rc = sync_block(inode,
|
|
(unsigned short *) qnx4_raw_inode(inode)->di_first_xtnt.xtnt_blk + i, wait);
|
|
if (rc > 0)
|
|
break;
|
|
if (rc)
|
|
err = rc;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
#ifdef WTF
|
|
static int sync_indirect(struct inode *inode, unsigned short *iblock, int wait)
|
|
{
|
|
int i;
|
|
struct buffer_head *ind_bh;
|
|
int rc, err = 0;
|
|
|
|
rc = sync_iblock(inode, iblock, &ind_bh, wait);
|
|
if (rc || !ind_bh)
|
|
return rc;
|
|
|
|
for (i = 0; i < 512; i++) {
|
|
rc = 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 sync_dindirect(struct inode *inode, unsigned short *diblock,
|
|
int wait)
|
|
{
|
|
int i;
|
|
struct buffer_head *dind_bh;
|
|
int rc, err = 0;
|
|
|
|
rc = sync_iblock(inode, diblock, &dind_bh, wait);
|
|
if (rc || !dind_bh)
|
|
return rc;
|
|
|
|
for (i = 0; i < 512; i++) {
|
|
rc = sync_indirect(inode,
|
|
((unsigned short *) dind_bh->b_data) + i,
|
|
wait);
|
|
if (rc > 0)
|
|
break;
|
|
if (rc)
|
|
err = rc;
|
|
}
|
|
brelse(dind_bh);
|
|
return err;
|
|
}
|
|
#endif
|
|
|
|
int qnx4_sync_file(struct file *file, struct dentry *dentry, int unused)
|
|
{
|
|
struct inode *inode = dentry->d_inode;
|
|
int wait, err = 0;
|
|
|
|
(void) file;
|
|
if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
|
|
S_ISLNK(inode->i_mode)))
|
|
return -EINVAL;
|
|
|
|
lock_kernel();
|
|
for (wait = 0; wait <= 1; wait++) {
|
|
err |= sync_direct(inode, wait);
|
|
}
|
|
err |= qnx4_sync_inode(inode);
|
|
unlock_kernel();
|
|
return (err < 0) ? -EIO : 0;
|
|
}
|
|
|
|
#endif
|