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

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/*
 *  linux/fs/ufs/ufs_symlink.c
 *
 * Copyright (C) 1996
 * Adrian Rodriguez (adrian@franklins-tower.rutgers.edu)
 * Laboratory for Computer Science Research Computing Facility
 * Rutgers, The State University of New Jersey
 *
 * $Id: ufs_symlink.c,v 1.1 2005-12-20 10:26:35 jcastillo Exp $
 *
 */
 
#include <linux/fs.h>
#include <linux/sched.h>
 
#include <asm/segment.h>
 
extern int ufs_bmap (struct inode *, int);
 
static int
ufs_readlink(struct inode * inode, char * buffer, int buflen)
{
        unsigned long int block;
        struct buffer_head * bh = NULL;
        char * link;
        int i;
        char c;
 
        if (inode->i_sb->u.ufs_sb.s_flags & (UFS_DEBUG|UFS_DEBUG_LINKS)) {
                printk("ufs_readlink: called on ino %lu dev %u/%u\n",
                       inode->i_ino, MAJOR(inode->i_dev), MINOR(inode->i_dev));
        }
 
        if (!S_ISLNK(inode->i_mode)) {
                iput (inode);
                return -EINVAL;
        }
        if (buflen > inode->i_sb->s_blocksize - 1)
                buflen = inode->i_sb->s_blocksize - 1;
        if (inode->i_blocks) {
                /* XXX - error checking */
                block = ufs_bmap(inode, 0);
                if (inode->i_sb->u.ufs_sb.s_flags &(UFS_DEBUG|UFS_DEBUG_LINKS)) {
                        printk("ufs_readlink: bmap got %lu for ino %lu\n",
                               block, inode->i_ino);
                }
                bh = bread(inode->i_dev, block, BLOCK_SIZE);
                if (!bh) {
                        iput (inode);
                        printk("ufs_readlink: can't read block 0 for ino %lu on dev %u/%u\n",
                               inode->i_ino, MAJOR(inode->i_dev),
                               MINOR(inode->i_dev));
                        return 0;
                }
                link = bh->b_data;
        }
        else {
                link = (char *)&(inode->u.ufs_i.ui_db[0]);
        }
        i = 0;
        while (i < buflen && (c = link[i])) {
                i++;
                put_user (c, buffer++);
        }
        iput (inode);
        if (bh)
                brelse (bh);
        return i;
}
 
/*
 * XXX - blatantly stolen from ext2fs
 */
static int
ufs_follow_link(struct inode * dir, struct inode * inode,
                int flag, int mode, struct inode ** res_inode)
{
        unsigned long int block;
        int error;
        struct buffer_head * bh;
        char * link;
 
        bh = NULL;
 
        if (inode->i_sb->u.ufs_sb.s_flags & (UFS_DEBUG|UFS_DEBUG_LINKS)) {
                printk("ufs_follow_link: called on ino %lu dev %u/%u\n",
                       dir->i_ino, MAJOR(dir->i_dev), MINOR(dir->i_dev));
        }
 
        *res_inode = NULL;
        if (!dir) {
                dir = current->fs->root;
                dir->i_count++;
        }
        if (!inode) {
                iput (dir);
                return -ENOENT;
        }
        if (!S_ISLNK(inode->i_mode)) {
                iput (dir);
                *res_inode = inode;
                return 0;
        }
        if (current->link_count > 5) {
                iput (dir);
                iput (inode);
                return -ELOOP;
        }
        if (inode->i_blocks) {
                /* read the link from disk */
                /* XXX - error checking */
                block = ufs_bmap(inode, 0);
                bh = bread(inode->i_dev, block, BLOCK_SIZE);
                if (bh == NULL) {
                        printk("ufs_follow_link: can't read block 0 for ino %lu on dev %u/%u\n",
                               inode->i_ino, MAJOR(inode->i_dev),
                               MINOR(inode->i_dev));
                        iput(dir);
                        iput(inode);
                        return(-EIO);
                }
                link = bh->b_data;
        } else {
                /* fast symlink */
                link = (char *)&(inode->u.ufs_i.ui_db[0]);
        }
        current->link_count++;
        error = open_namei (link, flag, mode, res_inode, dir);
        current->link_count--;
        iput (inode);
        if (bh) {
                brelse (bh);
        }
        return(error);
}
 
 
static struct file_operations ufs_symlink_operations = {
        NULL,                   /* lseek */
        NULL,                   /* read */
        NULL,                   /* write */
        NULL,                   /* readdir */
        NULL,                   /* select */
        NULL,                   /* ioctl */
        NULL,                   /* mmap */
        NULL,                   /* open */
        NULL,                   /* release */
        NULL,                   /* fsync */  /* XXX - is this ok? */
        NULL,                   /* fasync */
        NULL,                   /* check_media_change */
        NULL,                   /* revalidate */
};
 
struct inode_operations ufs_symlink_inode_operations = {
        &ufs_symlink_operations,        /* default directory file operations */
        NULL,                   /* create */
        NULL,                   /* lookup */
        NULL,                   /* link */
        NULL,                   /* unlink */
        NULL,                   /* symlink */
        NULL,                   /* mkdir */
        NULL,                   /* rmdir */
        NULL,                   /* mknod */
        NULL,                   /* rename */
        &ufs_readlink,          /* readlink */
        &ufs_follow_link,       /* follow_link */
        NULL,                   /* readpage */
        NULL,                   /* writepage */
        NULL,                   /* bmap */
        NULL,                   /* truncate */
        NULL,                   /* permission */
        NULL,                   /* smap */
};
 
/*
 * Local Variables: ***
 * c-indent-level: 8 ***
 * c-continued-statement-offset: 8 ***
 * c-brace-offset: -8 ***
 * c-argdecl-indent: 0 ***
 * c-label-offset: -8 ***
 * End: ***
 */

Line No.	Rev	Author	Line
1	1628	jcastillo	`/*`
2			`* linux/fs/ufs/ufs_symlink.c`
3			`*`
4			`* Copyright (C) 1996`
5			`* Adrian Rodriguez (adrian@franklins-tower.rutgers.edu)`
6			`* Laboratory for Computer Science Research Computing Facility`
7			`* Rutgers, The State University of New Jersey`
8			`*`
9			`* $Id: ufs_symlink.c,v 1.1 2005-12-20 10:26:35 jcastillo Exp $`
10			`*`
11			`*/`
12
13			`#include <linux/fs.h>`
14			`#include <linux/sched.h>`
15
16			`#include <asm/segment.h>`
17
18			`extern int ufs_bmap (struct inode *, int);`
19
20			`static int`
21			`ufs_readlink(struct inode * inode, char * buffer, int buflen)`
22			`{`
23			`unsigned long int block;`
24			`struct buffer_head * bh = NULL;`
25			`char * link;`
26			`int i;`
27			`char c;`
28
29			`if (inode->i_sb->u.ufs_sb.s_flags & (UFS_DEBUG\|UFS_DEBUG_LINKS)) {`
30			`printk("ufs_readlink: called on ino %lu dev %u/%u\n",`
31			`inode->i_ino, MAJOR(inode->i_dev), MINOR(inode->i_dev));`
32			`}`
33
34			`if (!S_ISLNK(inode->i_mode)) {`
35			`iput (inode);`
36			`return -EINVAL;`
37			`}`
38			`if (buflen > inode->i_sb->s_blocksize - 1)`
39			`buflen = inode->i_sb->s_blocksize - 1;`
40			`if (inode->i_blocks) {`
41			`/* XXX - error checking */`
42			`block = ufs_bmap(inode, 0);`
43			`if (inode->i_sb->u.ufs_sb.s_flags &(UFS_DEBUG\|UFS_DEBUG_LINKS)) {`
44			`printk("ufs_readlink: bmap got %lu for ino %lu\n",`
45			`block, inode->i_ino);`
46			`}`
47			`bh = bread(inode->i_dev, block, BLOCK_SIZE);`
48			`if (!bh) {`
49			`iput (inode);`
50			`printk("ufs_readlink: can't read block 0 for ino %lu on dev %u/%u\n",`
51			`inode->i_ino, MAJOR(inode->i_dev),`
52			`MINOR(inode->i_dev));`
53			`return 0;`
54			`}`
55			`link = bh->b_data;`
56			`}`
57			`else {`
58			`link = (char *)&(inode->u.ufs_i.ui_db[0]);`
59			`}`
60			`i = 0;`
61			`while (i < buflen && (c = link[i])) {`
62			`i++;`
63			`put_user (c, buffer++);`
64			`}`
65			`iput (inode);`
66			`if (bh)`
67			`brelse (bh);`
68			`return i;`
69			`}`
70
71			`/*`
72			`* XXX - blatantly stolen from ext2fs`
73			`*/`
74			`static int`
75			`ufs_follow_link(struct inode * dir, struct inode * inode,`
76			`int flag, int mode, struct inode ** res_inode)`
77			`{`
78			`unsigned long int block;`
79			`int error;`
80			`struct buffer_head * bh;`
81			`char * link;`
82
83			`bh = NULL;`
84
85			`if (inode->i_sb->u.ufs_sb.s_flags & (UFS_DEBUG\|UFS_DEBUG_LINKS)) {`
86			`printk("ufs_follow_link: called on ino %lu dev %u/%u\n",`
87			`dir->i_ino, MAJOR(dir->i_dev), MINOR(dir->i_dev));`
88			`}`
89
90			`*res_inode = NULL;`
91			`if (!dir) {`
92			`dir = current->fs->root;`
93			`dir->i_count++;`
94			`}`
95			`if (!inode) {`
96			`iput (dir);`
97			`return -ENOENT;`
98			`}`
99			`if (!S_ISLNK(inode->i_mode)) {`
100			`iput (dir);`
101			`*res_inode = inode;`
102			`return 0;`
103			`}`
104			`if (current->link_count > 5) {`
105			`iput (dir);`
106			`iput (inode);`
107			`return -ELOOP;`
108			`}`
109			`if (inode->i_blocks) {`
110			`/* read the link from disk */`
111			`/* XXX - error checking */`
112			`block = ufs_bmap(inode, 0);`
113			`bh = bread(inode->i_dev, block, BLOCK_SIZE);`
114			`if (bh == NULL) {`
115			`printk("ufs_follow_link: can't read block 0 for ino %lu on dev %u/%u\n",`
116			`inode->i_ino, MAJOR(inode->i_dev),`
117			`MINOR(inode->i_dev));`
118			`iput(dir);`
119			`iput(inode);`
120			`return(-EIO);`
121			`}`
122			`link = bh->b_data;`
123			`} else {`
124			`/* fast symlink */`
125			`link = (char *)&(inode->u.ufs_i.ui_db[0]);`
126			`}`
127			`current->link_count++;`
128			`error = open_namei (link, flag, mode, res_inode, dir);`
129			`current->link_count--;`
130			`iput (inode);`
131			`if (bh) {`
132			`brelse (bh);`
133			`}`
134			`return(error);`
135			`}`
136
137
138			`static struct file_operations ufs_symlink_operations = {`
139			`NULL, /* lseek */`
140			`NULL, /* read */`
141			`NULL, /* write */`
142			`NULL, /* readdir */`
143			`NULL, /* select */`
144			`NULL, /* ioctl */`
145			`NULL, /* mmap */`
146			`NULL, /* open */`
147			`NULL, /* release */`
148			`NULL, /* fsync / / XXX - is this ok? */`
149			`NULL, /* fasync */`
150			`NULL, /* check_media_change */`
151			`NULL, /* revalidate */`
152			`};`
153
154			`struct inode_operations ufs_symlink_inode_operations = {`
155			`&ufs_symlink_operations, /* default directory file operations */`
156			`NULL, /* create */`
157			`NULL, /* lookup */`
158			`NULL, /* link */`
159			`NULL, /* unlink */`
160			`NULL, /* symlink */`
161			`NULL, /* mkdir */`
162			`NULL, /* rmdir */`
163			`NULL, /* mknod */`
164			`NULL, /* rename */`
165			`&ufs_readlink, /* readlink */`
166			`&ufs_follow_link, /* follow_link */`
167			`NULL, /* readpage */`
168			`NULL, /* writepage */`
169			`NULL, /* bmap */`
170			`NULL, /* truncate */`
171			`NULL, /* permission */`
172			`NULL, /* smap */`
173			`};`
174
175			`/*`
176			`* Local Variables: ***`
177			`* c-indent-level: 8 ***`
178			`* c-continued-statement-offset: 8 ***`
179			`* c-brace-offset: -8 ***`
180			`* c-argdecl-indent: 0 ***`
181			`* c-label-offset: -8 ***`
182			`* End: ***`
183			`*/`

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