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1.1 root 1: /*
2: * linux/fs/ext/dir.c
3: *
1.1.1.2 root 4: * Copyright (C) 1992 Remy Card ([email protected])
1.1 root 5: *
6: * from
7: *
8: * linux/fs/minix/dir.c
9: *
1.1.1.2 root 10: * Copyright (C) 1991, 1992 Linus Torvalds
1.1 root 11: *
12: * ext directory handling functions
13: */
14:
15: #include <asm/segment.h>
16:
1.1.1.2 root 17: #include <linux/errno.h>
1.1.1.3 ! root 18: #include <linux/kernel.h>
1.1 root 19: #include <linux/fs.h>
20: #include <linux/ext_fs.h>
21: #include <linux/stat.h>
22:
23: static int ext_readdir(struct inode *, struct file *, struct dirent *, int);
24:
25: static struct file_operations ext_dir_operations = {
26: NULL, /* lseek - default */
27: NULL, /* read */
28: NULL, /* write - bad */
29: ext_readdir, /* readdir */
30: NULL, /* select - default */
31: NULL, /* ioctl - default */
32: NULL, /* no special open code */
33: NULL /* no special release code */
34: };
35:
36: /*
37: * directories can handle most operations...
38: */
39: struct inode_operations ext_dir_inode_operations = {
40: &ext_dir_operations, /* default directory file-ops */
41: ext_create, /* create */
42: ext_lookup, /* lookup */
43: ext_link, /* link */
44: ext_unlink, /* unlink */
45: ext_symlink, /* symlink */
46: ext_mkdir, /* mkdir */
47: ext_rmdir, /* rmdir */
48: ext_mknod, /* mknod */
49: ext_rename, /* rename */
50: NULL, /* readlink */
51: NULL, /* follow_link */
1.1.1.3 ! root 52: NULL, /* bmap */
1.1 root 53: ext_truncate /* truncate */
54: };
55:
56: static int ext_readdir(struct inode * inode, struct file * filp,
57: struct dirent * dirent, int count)
58: {
1.1.1.3 ! root 59: unsigned int offset,i;
1.1 root 60: char c;
61: struct buffer_head * bh;
62: struct ext_dir_entry * de;
63:
64: if (!inode || !S_ISDIR(inode->i_mode))
65: return -EBADF;
66: while (filp->f_pos < inode->i_size) {
67: offset = filp->f_pos & 1023;
1.1.1.3 ! root 68: bh = ext_bread(inode,(filp->f_pos)>>BLOCK_SIZE_BITS,0);
! 69: if (!bh) {
1.1 root 70: filp->f_pos += 1024-offset;
71: continue;
72: }
73: de = (struct ext_dir_entry *) (offset + bh->b_data);
74: while (offset < 1024 && filp->f_pos < inode->i_size) {
75: offset += de->rec_len;
76: filp->f_pos += de->rec_len;
1.1.1.3 ! root 77: if (de->rec_len < 8 || de->rec_len % 4 != 0 ||
! 78: de->rec_len < de->name_len + 8) {
! 79: printk ("ext_readdir: bad directory entry\n");
! 80: printk ("dev=%d, dir=%d, offset=%d, rec_len=%d, name_len=%d\n",
! 81: inode->i_dev, inode->i_ino, offset, de->rec_len, de->name_len);
! 82: return 0;
! 83: }
1.1 root 84: if (de->inode) {
85: for (i = 0; i < de->name_len; i++)
86: if (c = de->name[i])
87: put_fs_byte(c,i+dirent->d_name);
88: else
89: break;
90: if (i) {
91: put_fs_long(de->inode,&dirent->d_ino);
92: put_fs_byte(0,i+dirent->d_name);
93: put_fs_word(i,&dirent->d_reclen);
94: brelse(bh);
95: return i;
96: }
97: }
1.1.1.3 ! root 98: de = (struct ext_dir_entry *) ((char *) de
! 99: + de->rec_len);
1.1 root 100: }
101: brelse(bh);
102: }
103: return 0;
104: }
This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.