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