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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [fs/] [minix/] [dir.c] - Blame information for rev 1765

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/*
 *  linux/fs/minix/dir.c
 *
 *  Copyright (C) 1991, 1992 Linus Torvalds
 *
 *  minix directory handling functions
 */
 
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/minix_fs.h>
#include <linux/stat.h>
 
#include <asm/segment.h>
 
static int minix_dir_read(struct inode * inode, struct file * filp, char * buf, int count)
{
        return -EISDIR;
}
 
static int minix_readdir(struct inode *, struct file *, void *, filldir_t);
 
static struct file_operations minix_dir_operations = {
        NULL,                   /* lseek - default */
        minix_dir_read,         /* read */
        NULL,                   /* write - bad */
        minix_readdir,          /* readdir */
        NULL,                   /* select - default */
        NULL,                   /* ioctl - default */
        NULL,                   /* mmap */
        NULL,                   /* no special open code */
        NULL,                   /* no special release code */
        file_fsync              /* default fsync */
};
 
/*
 * directories can handle most operations...
 */
struct inode_operations minix_dir_inode_operations = {
        &minix_dir_operations,  /* default directory file-ops */
        minix_create,           /* create */
        minix_lookup,           /* lookup */
        minix_link,             /* link */
        minix_unlink,           /* unlink */
        minix_symlink,          /* symlink */
        minix_mkdir,            /* mkdir */
        minix_rmdir,            /* rmdir */
        minix_mknod,            /* mknod */
        minix_rename,           /* rename */
        NULL,                   /* readlink */
        NULL,                   /* follow_link */
        NULL,                   /* readpage */
        NULL,                   /* writepage */
        NULL,                   /* bmap */
        minix_truncate,         /* truncate */
        NULL                    /* permission */
};
 
static int minix_readdir(struct inode * inode, struct file * filp,
        void * dirent, filldir_t filldir)
{
        unsigned int offset;
        struct buffer_head * bh;
        struct minix_dir_entry * de;
        struct minix_sb_info * info;
 
        if (!inode || !inode->i_sb || !S_ISDIR(inode->i_mode))
                return -EBADF;
        info = &inode->i_sb->u.minix_sb;
        if (filp->f_pos & (info->s_dirsize - 1))
                return -EBADF;
        while (filp->f_pos < inode->i_size) {
                offset = filp->f_pos & 1023;
                bh = minix_bread(inode,(filp->f_pos)>>BLOCK_SIZE_BITS,0);
                if (!bh) {
                        filp->f_pos += 1024-offset;
                        continue;
                }
                do {
                        de = (struct minix_dir_entry *) (offset + bh->b_data);
                        if (de->inode) {
                                int size = strnlen(de->name, info->s_namelen);
                                if (filldir(dirent, de->name, size, filp->f_pos, de->inode) < 0) {
                                        brelse(bh);
                                        return 0;
                                }
                        }
                        offset += info->s_dirsize;
                        filp->f_pos += info->s_dirsize;
                } while (offset < 1024 && filp->f_pos < inode->i_size);
                brelse(bh);
        }
        return 0;
}

Line No.	Rev	Author	Line
1	1628	jcastillo	`/*`
2			`* linux/fs/minix/dir.c`
3			`*`
4			`* Copyright (C) 1991, 1992 Linus Torvalds`
5			`*`
6			`* minix directory handling functions`
7			`*/`
8
9			`#include <linux/string.h>`
10			`#include <linux/errno.h>`
11			`#include <linux/fs.h>`
12			`#include <linux/minix_fs.h>`
13			`#include <linux/stat.h>`
14
15			`#include <asm/segment.h>`
16
17			`static int minix_dir_read(struct inode * inode, struct file * filp, char * buf, int count)`
18			`{`
19			`return -EISDIR;`
20			`}`
21
22			`static int minix_readdir(struct inode , struct file , void *, filldir_t);`
23
24			`static struct file_operations minix_dir_operations = {`
25			`NULL, /* lseek - default */`
26			`minix_dir_read, /* read */`
27			`NULL, /* write - bad */`
28			`minix_readdir, /* readdir */`
29			`NULL, /* select - default */`
30			`NULL, /* ioctl - default */`
31			`NULL, /* mmap */`
32			`NULL, /* no special open code */`
33			`NULL, /* no special release code */`
34			`file_fsync /* default fsync */`
35			`};`
36
37			`/*`
38			`* directories can handle most operations...`
39			`*/`
40			`struct inode_operations minix_dir_inode_operations = {`
41			`&minix_dir_operations, /* default directory file-ops */`
42			`minix_create, /* create */`
43			`minix_lookup, /* lookup */`
44			`minix_link, /* link */`
45			`minix_unlink, /* unlink */`
46			`minix_symlink, /* symlink */`
47			`minix_mkdir, /* mkdir */`
48			`minix_rmdir, /* rmdir */`
49			`minix_mknod, /* mknod */`
50			`minix_rename, /* rename */`
51			`NULL, /* readlink */`
52			`NULL, /* follow_link */`
53			`NULL, /* readpage */`
54			`NULL, /* writepage */`
55			`NULL, /* bmap */`
56			`minix_truncate, /* truncate */`
57			`NULL /* permission */`
58			`};`
59
60			`static int minix_readdir(struct inode * inode, struct file * filp,`
61			`void * dirent, filldir_t filldir)`
62			`{`
63			`unsigned int offset;`
64			`struct buffer_head * bh;`
65			`struct minix_dir_entry * de;`
66			`struct minix_sb_info * info;`
67
68			`if (!inode \|\| !inode->i_sb \|\| !S_ISDIR(inode->i_mode))`
69			`return -EBADF;`
70			`info = &inode->i_sb->u.minix_sb;`
71			`if (filp->f_pos & (info->s_dirsize - 1))`
72			`return -EBADF;`
73			`while (filp->f_pos < inode->i_size) {`
74			`offset = filp->f_pos & 1023;`
75			`bh = minix_bread(inode,(filp->f_pos)>>BLOCK_SIZE_BITS,0);`
76			`if (!bh) {`
77			`filp->f_pos += 1024-offset;`
78			`continue;`
79			`}`
80			`do {`
81			`de = (struct minix_dir_entry *) (offset + bh->b_data);`
82			`if (de->inode) {`
83			`int size = strnlen(de->name, info->s_namelen);`
84			`if (filldir(dirent, de->name, size, filp->f_pos, de->inode) < 0) {`
85			`brelse(bh);`
86			`return 0;`
87			`}`
88			`}`
89			`offset += info->s_dirsize;`
90			`filp->f_pos += info->s_dirsize;`
91			`} while (offset < 1024 && filp->f_pos < inode->i_size);`
92			`brelse(bh);`
93			`}`
94			`return 0;`
95			`}`

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