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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [fs/] [sysv/] [dir.c] - Blame information for rev 1777

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/*
 *  linux/fs/sysv/dir.c
 *
 *  minix/dir.c
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *
 *  coh/dir.c
 *  Copyright (C) 1993  Pascal Haible, Bruno Haible
 *
 *  sysv/dir.c
 *  Copyright (C) 1993  Bruno Haible
 *
 *  SystemV/Coherent directory handling functions
 */
 
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/sysv_fs.h>
#include <linux/stat.h>
#include <linux/string.h>
 
#include <asm/segment.h>
 
static int sysv_dir_read(struct inode * inode, struct file * filp, char * buf, int count)
{
        return -EISDIR;
}
 
static int sysv_readdir(struct inode *, struct file *, void *, filldir_t);
 
static struct file_operations sysv_dir_operations = {
        NULL,                   /* lseek - default */
        sysv_dir_read,          /* read */
        NULL,                   /* write - bad */
        sysv_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 sysv_dir_inode_operations = {
        &sysv_dir_operations,   /* default directory file-ops */
        sysv_create,            /* create */
        sysv_lookup,            /* lookup */
        sysv_link,              /* link */
        sysv_unlink,            /* unlink */
        sysv_symlink,           /* symlink */
        sysv_mkdir,             /* mkdir */
        sysv_rmdir,             /* rmdir */
        sysv_mknod,             /* mknod */
        sysv_rename,            /* rename */
        NULL,                   /* readlink */
        NULL,                   /* follow_link */
        NULL,                   /* readpage */
        NULL,                   /* writepage */
        NULL,                   /* bmap */
        sysv_truncate,          /* truncate */
        NULL                    /* permission */
};
 
static int sysv_readdir(struct inode * inode, struct file * filp,
        void * dirent, filldir_t filldir)
{
        struct super_block * sb;
        unsigned int offset,i;
        struct buffer_head * bh;
        char* bh_data;
        struct sysv_dir_entry * de, sde;
 
        if (!inode || !(sb = inode->i_sb) || !S_ISDIR(inode->i_mode))
                return -EBADF;
        if ((unsigned long)(filp->f_pos) % SYSV_DIRSIZE)
                return -EBADF;
        while (filp->f_pos < inode->i_size) {
                offset = filp->f_pos & sb->sv_block_size_1;
                bh = sysv_file_bread(inode, filp->f_pos >> sb->sv_block_size_bits, 0);
                if (!bh) {
                        filp->f_pos += sb->sv_block_size - offset;
                        continue;
                }
                bh_data = bh->b_data;
                while (offset < sb->sv_block_size && filp->f_pos < inode->i_size) {
                        de = (struct sysv_dir_entry *) (offset + bh_data);
                        if (de->inode) {
                                /* Copy the directory entry first, because the directory
                                 * might be modified while we sleep in filldir()...
                                 */
                                memcpy(&sde, de, sizeof(struct sysv_dir_entry));
 
                                if (sde.inode > inode->i_sb->sv_ninodes)
                                        printk("sysv_readdir: Bad inode number on dev "
                                               "%s, ino %ld, offset 0x%04lx: %d is out of range\n",
                                               kdevname(inode->i_dev),
                                               inode->i_ino, (off_t) filp->f_pos, sde.inode);
 
                                i = strnlen(sde.name, SYSV_NAMELEN);
                                if (filldir(dirent, sde.name, i, filp->f_pos, sde.inode) < 0) {
                                        brelse(bh);
                                        return 0;
                                }
                        }
                        offset += SYSV_DIRSIZE;
                        filp->f_pos += SYSV_DIRSIZE;
                }
                brelse(bh);
        }
        return 0;
}

Line No.	Rev	Author	Line
1	1628	jcastillo	`/*`
2			`* linux/fs/sysv/dir.c`
3			`*`
4			`* minix/dir.c`
5			`* Copyright (C) 1991, 1992 Linus Torvalds`
6			`*`
7			`* coh/dir.c`
8			`* Copyright (C) 1993 Pascal Haible, Bruno Haible`
9			`*`
10			`* sysv/dir.c`
11			`* Copyright (C) 1993 Bruno Haible`
12			`*`
13			`* SystemV/Coherent directory handling functions`
14			`*/`
15
16			`#include <linux/errno.h>`
17			`#include <linux/fs.h>`
18			`#include <linux/sysv_fs.h>`
19			`#include <linux/stat.h>`
20			`#include <linux/string.h>`
21
22			`#include <asm/segment.h>`
23
24			`static int sysv_dir_read(struct inode * inode, struct file * filp, char * buf, int count)`
25			`{`
26			`return -EISDIR;`
27			`}`
28
29			`static int sysv_readdir(struct inode , struct file , void *, filldir_t);`
30
31			`static struct file_operations sysv_dir_operations = {`
32			`NULL, /* lseek - default */`
33			`sysv_dir_read, /* read */`
34			`NULL, /* write - bad */`
35			`sysv_readdir, /* readdir */`
36			`NULL, /* select - default */`
37			`NULL, /* ioctl - default */`
38			`NULL, /* mmap */`
39			`NULL, /* no special open code */`
40			`NULL, /* no special release code */`
41			`file_fsync /* default fsync */`
42			`};`
43
44			`/*`
45			`* directories can handle most operations...`
46			`*/`
47			`struct inode_operations sysv_dir_inode_operations = {`
48			`&sysv_dir_operations, /* default directory file-ops */`
49			`sysv_create, /* create */`
50			`sysv_lookup, /* lookup */`
51			`sysv_link, /* link */`
52			`sysv_unlink, /* unlink */`
53			`sysv_symlink, /* symlink */`
54			`sysv_mkdir, /* mkdir */`
55			`sysv_rmdir, /* rmdir */`
56			`sysv_mknod, /* mknod */`
57			`sysv_rename, /* rename */`
58			`NULL, /* readlink */`
59			`NULL, /* follow_link */`
60			`NULL, /* readpage */`
61			`NULL, /* writepage */`
62			`NULL, /* bmap */`
63			`sysv_truncate, /* truncate */`
64			`NULL /* permission */`
65			`};`
66
67			`static int sysv_readdir(struct inode * inode, struct file * filp,`
68			`void * dirent, filldir_t filldir)`
69			`{`
70			`struct super_block * sb;`
71			`unsigned int offset,i;`
72			`struct buffer_head * bh;`
73			`char* bh_data;`
74			`struct sysv_dir_entry * de, sde;`
75
76			`if (!inode \|\| !(sb = inode->i_sb) \|\| !S_ISDIR(inode->i_mode))`
77			`return -EBADF;`
78			`if ((unsigned long)(filp->f_pos) % SYSV_DIRSIZE)`
79			`return -EBADF;`
80			`while (filp->f_pos < inode->i_size) {`
81			`offset = filp->f_pos & sb->sv_block_size_1;`
82			`bh = sysv_file_bread(inode, filp->f_pos >> sb->sv_block_size_bits, 0);`
83			`if (!bh) {`
84			`filp->f_pos += sb->sv_block_size - offset;`
85			`continue;`
86			`}`
87			`bh_data = bh->b_data;`
88			`while (offset < sb->sv_block_size && filp->f_pos < inode->i_size) {`
89			`de = (struct sysv_dir_entry *) (offset + bh_data);`
90			`if (de->inode) {`
91			`/* Copy the directory entry first, because the directory`
92			`* might be modified while we sleep in filldir()...`
93			`*/`
94			`memcpy(&sde, de, sizeof(struct sysv_dir_entry));`
95
96			`if (sde.inode > inode->i_sb->sv_ninodes)`
97			`printk("sysv_readdir: Bad inode number on dev "`
98			`"%s, ino %ld, offset 0x%04lx: %d is out of range\n",`
99			`kdevname(inode->i_dev),`
100			`inode->i_ino, (off_t) filp->f_pos, sde.inode);`
101
102			`i = strnlen(sde.name, SYSV_NAMELEN);`
103			`if (filldir(dirent, sde.name, i, filp->f_pos, sde.inode) < 0) {`
104			`brelse(bh);`
105			`return 0;`
106			`}`
107			`}`
108			`offset += SYSV_DIRSIZE;`
109			`filp->f_pos += SYSV_DIRSIZE;`
110			`}`
111			`brelse(bh);`
112			`}`
113			`return 0;`
114			`}`

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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [fs/] [sysv/] [dir.c] - Blame information for rev 1777