80 lines
1.9 KiB
C
80 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* QNX4 file system, Linux implementation.
|
|
*
|
|
* Version : 0.2.1
|
|
*
|
|
* Using parts of the xiafs filesystem.
|
|
*
|
|
* History :
|
|
*
|
|
* 28-05-1998 by Richard Frowijn : first release.
|
|
* 20-06-1998 by Frank Denis : Linux 2.1.99+ & dcache support.
|
|
*/
|
|
|
|
#include <linux/buffer_head.h>
|
|
#include "qnx4.h"
|
|
|
|
static int qnx4_readdir(struct file *file, struct dir_context *ctx)
|
|
{
|
|
struct inode *inode = file_inode(file);
|
|
unsigned int offset;
|
|
struct buffer_head *bh;
|
|
unsigned long blknum;
|
|
int ix, ino;
|
|
int size;
|
|
|
|
QNX4DEBUG((KERN_INFO "qnx4_readdir:i_size = %ld\n", (long) inode->i_size));
|
|
QNX4DEBUG((KERN_INFO "pos = %ld\n", (long) ctx->pos));
|
|
|
|
while (ctx->pos < inode->i_size) {
|
|
blknum = qnx4_block_map(inode, ctx->pos >> QNX4_BLOCK_SIZE_BITS);
|
|
bh = sb_bread(inode->i_sb, blknum);
|
|
if (bh == NULL) {
|
|
printk(KERN_ERR "qnx4_readdir: bread failed (%ld)\n", blknum);
|
|
return 0;
|
|
}
|
|
ix = (ctx->pos >> QNX4_DIR_ENTRY_SIZE_BITS) % QNX4_INODES_PER_BLOCK;
|
|
for (; ix < QNX4_INODES_PER_BLOCK; ix++, ctx->pos += QNX4_DIR_ENTRY_SIZE) {
|
|
union qnx4_directory_entry *de;
|
|
const char *fname;
|
|
|
|
offset = ix * QNX4_DIR_ENTRY_SIZE;
|
|
de = (union qnx4_directory_entry *) (bh->b_data + offset);
|
|
|
|
fname = get_entry_fname(de, &size);
|
|
if (!fname)
|
|
continue;
|
|
|
|
if (!(de->de_status & QNX4_FILE_LINK)) {
|
|
ino = blknum * QNX4_INODES_PER_BLOCK + ix - 1;
|
|
} else {
|
|
ino = ( le32_to_cpu(de->link.dl_inode_blk) - 1 ) *
|
|
QNX4_INODES_PER_BLOCK +
|
|
de->link.dl_inode_ndx;
|
|
}
|
|
|
|
QNX4DEBUG((KERN_INFO "qnx4_readdir:%.*s\n", size, fname));
|
|
if (!dir_emit(ctx, fname, size, ino, DT_UNKNOWN)) {
|
|
brelse(bh);
|
|
return 0;
|
|
}
|
|
}
|
|
brelse(bh);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
const struct file_operations qnx4_dir_operations =
|
|
{
|
|
.llseek = generic_file_llseek,
|
|
.read = generic_read_dir,
|
|
.iterate_shared = qnx4_readdir,
|
|
.fsync = generic_file_fsync,
|
|
};
|
|
|
|
const struct inode_operations qnx4_dir_inode_operations =
|
|
{
|
|
.lookup = qnx4_lookup,
|
|
};
|