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82 lines
2.2 KiB
82 lines
2.2 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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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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