mirror of https://gitee.com/openkylin/linux.git
82 lines
2.1 KiB
C
82 lines
2.1 KiB
C
/*
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* QNX4 file system, Linux implementation.
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*
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* Version : 0.2.1
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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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* 28-05-1998 by Richard Frowijn : first release.
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* 20-06-1998 by Frank Denis : Linux 2.1.99+ & dcache support.
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*/
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#include <linux/buffer_head.h>
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#include "qnx4.h"
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static int qnx4_readdir(struct file *file, struct dir_context *ctx)
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{
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struct inode *inode = file_inode(file);
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unsigned int offset;
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struct buffer_head *bh;
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struct qnx4_inode_entry *de;
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struct qnx4_link_info *le;
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unsigned long blknum;
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int ix, ino;
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int size;
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QNX4DEBUG((KERN_INFO "qnx4_readdir:i_size = %ld\n", (long) inode->i_size));
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QNX4DEBUG((KERN_INFO "pos = %ld\n", (long) ctx->pos));
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while (ctx->pos < inode->i_size) {
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blknum = qnx4_block_map(inode, ctx->pos >> QNX4_BLOCK_SIZE_BITS);
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bh = sb_bread(inode->i_sb, blknum);
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if (bh == NULL) {
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printk(KERN_ERR "qnx4_readdir: bread failed (%ld)\n", blknum);
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return 0;
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}
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ix = (ctx->pos >> QNX4_DIR_ENTRY_SIZE_BITS) % QNX4_INODES_PER_BLOCK;
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for (; ix < QNX4_INODES_PER_BLOCK; ix++, ctx->pos += QNX4_DIR_ENTRY_SIZE) {
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offset = ix * QNX4_DIR_ENTRY_SIZE;
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de = (struct qnx4_inode_entry *) (bh->b_data + offset);
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if (!de->di_fname[0])
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continue;
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if (!(de->di_status & (QNX4_FILE_USED|QNX4_FILE_LINK)))
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continue;
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if (!(de->di_status & QNX4_FILE_LINK))
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size = QNX4_SHORT_NAME_MAX;
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else
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size = QNX4_NAME_MAX;
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size = strnlen(de->di_fname, size);
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QNX4DEBUG((KERN_INFO "qnx4_readdir:%.*s\n", size, de->di_fname));
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if (!(de->di_status & QNX4_FILE_LINK))
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ino = blknum * QNX4_INODES_PER_BLOCK + ix - 1;
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else {
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le = (struct qnx4_link_info*)de;
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ino = ( le32_to_cpu(le->dl_inode_blk) - 1 ) *
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QNX4_INODES_PER_BLOCK +
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le->dl_inode_ndx;
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}
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if (!dir_emit(ctx, de->di_fname, size, ino, DT_UNKNOWN)) {
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brelse(bh);
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return 0;
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}
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}
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brelse(bh);
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}
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return 0;
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}
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const struct file_operations qnx4_dir_operations =
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{
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.llseek = generic_file_llseek,
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.read = generic_read_dir,
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.iterate_shared = qnx4_readdir,
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.fsync = generic_file_fsync,
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};
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const struct inode_operations qnx4_dir_inode_operations =
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{
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.lookup = qnx4_lookup,
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};
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