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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [fs/] [devpts/] [inode.c] - Blame information for rev 1765

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Line No. Rev Author Line
1 1275 phoenix
/* -*- linux-c -*- --------------------------------------------------------- *
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 *
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 * linux/fs/devpts/inode.c
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 *
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 *  Copyright 1998 H. Peter Anvin -- All Rights Reserved
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 *
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 * This file is part of the Linux kernel and is made available under
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 * the terms of the GNU General Public License, version 2, or at your
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 * option, any later version, incorporated herein by reference.
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 *
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 * ------------------------------------------------------------------------- */
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13
#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/fs.h>
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#include <linux/init.h>
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#include <linux/kdev_t.h>
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#include <linux/kernel.h>
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#include <linux/locks.h>
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#include <linux/major.h>
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#include <linux/slab.h>
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#include <linux/stat.h>
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#include <linux/tty.h>
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#include <asm/bitops.h>
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#include <asm/uaccess.h>
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#include "devpts_i.h"
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static struct vfsmount *devpts_mnt;
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static void devpts_put_super(struct super_block *sb)
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{
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        struct devpts_sb_info *sbi = SBI(sb);
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        struct inode *inode;
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        int i;
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        for ( i = 0 ; i < sbi->max_ptys ; i++ ) {
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                if ( (inode = sbi->inodes[i]) ) {
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                        if ( atomic_read(&inode->i_count) != 1 )
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                                printk("devpts_put_super: badness: entry %d count %d\n",
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                                       i, atomic_read(&inode->i_count));
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                        inode->i_nlink--;
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                        iput(inode);
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                }
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        }
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        kfree(sbi->inodes);
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        kfree(sbi);
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}
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static int devpts_statfs(struct super_block *sb, struct statfs *buf);
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static int devpts_remount (struct super_block * sb, int * flags, char * data);
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static struct super_operations devpts_sops = {
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        put_super:      devpts_put_super,
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        statfs:         devpts_statfs,
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        remount_fs:     devpts_remount,
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};
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static int devpts_parse_options(char *options, struct devpts_sb_info *sbi)
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{
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        int setuid = 0;
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        int setgid = 0;
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        uid_t uid = 0;
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        gid_t gid = 0;
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        umode_t mode = 0600;
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        char *this_char, *value;
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        this_char = NULL;
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        if ( options )
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                this_char = strtok(options,",");
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        for ( ; this_char; this_char = strtok(NULL,",")) {
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                if ((value = strchr(this_char,'=')) != NULL)
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                        *value++ = 0;
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                if (!strcmp(this_char,"uid")) {
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                        if (!value || !*value)
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                                return 1;
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                        uid = simple_strtoul(value,&value,0);
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                        if (*value)
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                                return 1;
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                        setuid = 1;
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                }
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                else if (!strcmp(this_char,"gid")) {
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                        if (!value || !*value)
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                                return 1;
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                        gid = simple_strtoul(value,&value,0);
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                        if (*value)
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                                return 1;
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                        setgid = 1;
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                }
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                else if (!strcmp(this_char,"mode")) {
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                        if (!value || !*value)
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                                return 1;
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                        mode = simple_strtoul(value,&value,8);
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                        if (*value)
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                                return 1;
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                }
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                else
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                        return 1;
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        }
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        sbi->setuid  = setuid;
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        sbi->setgid  = setgid;
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        sbi->uid     = uid;
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        sbi->gid     = gid;
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        sbi->mode    = mode & ~S_IFMT;
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        return 0;
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}
109
 
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static int devpts_remount(struct super_block * sb, int * flags, char * data)
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{
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        struct devpts_sb_info *sbi = sb->u.generic_sbp;
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        int res = devpts_parse_options(data,sbi);
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        if (res) {
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                printk("devpts: called with bogus options\n");
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                return -EINVAL;
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        }
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        return 0;
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}
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struct super_block *devpts_read_super(struct super_block *s, void *data,
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                                      int silent)
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{
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        struct inode * inode;
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        struct devpts_sb_info *sbi;
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        sbi = (struct devpts_sb_info *) kmalloc(sizeof(struct devpts_sb_info), GFP_KERNEL);
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        if ( !sbi )
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                goto fail;
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        sbi->magic  = DEVPTS_SBI_MAGIC;
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        sbi->max_ptys = unix98_max_ptys;
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        sbi->inodes = kmalloc(sizeof(struct inode *) * sbi->max_ptys, GFP_KERNEL);
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        if ( !sbi->inodes )
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                goto fail_free;
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        memset(sbi->inodes, 0, sizeof(struct inode *) * sbi->max_ptys);
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138
        if ( devpts_parse_options(data,sbi) && !silent) {
139
                printk("devpts: called with bogus options\n");
140
                goto fail_free;
141
        }
142
 
143
        inode = new_inode(s);
144
        if (!inode)
145
                goto fail_free;
146
        inode->i_ino = 1;
147
        inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
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        inode->i_blocks = 0;
149
        inode->i_blksize = 1024;
150
        inode->i_uid = inode->i_gid = 0;
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        inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO | S_IWUSR;
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        inode->i_op = &devpts_root_inode_operations;
153
        inode->i_fop = &devpts_root_operations;
154
        inode->i_nlink = 2;
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156
        s->u.generic_sbp = (void *) sbi;
157
        s->s_blocksize = 1024;
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        s->s_blocksize_bits = 10;
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        s->s_magic = DEVPTS_SUPER_MAGIC;
160
        s->s_op = &devpts_sops;
161
        s->s_root = d_alloc_root(inode);
162
        if (s->s_root)
163
                return s;
164
 
165
        printk("devpts: get root dentry failed\n");
166
        iput(inode);
167
fail_free:
168
        kfree(sbi);
169
fail:
170
        return NULL;
171
}
172
 
173
static int devpts_statfs(struct super_block *sb, struct statfs *buf)
174
{
175
        buf->f_type = DEVPTS_SUPER_MAGIC;
176
        buf->f_bsize = 1024;
177
        buf->f_namelen = NAME_MAX;
178
        return 0;
179
}
180
 
181
static DECLARE_FSTYPE(devpts_fs_type, "devpts", devpts_read_super, FS_SINGLE);
182
 
183
void devpts_pty_new(int number, kdev_t device)
184
{
185
        struct super_block *sb = devpts_mnt->mnt_sb;
186
        struct devpts_sb_info *sbi = SBI(sb);
187
        struct inode *inode;
188
 
189
        if ( sbi->inodes[number] )
190
                return; /* Already registered, this does happen */
191
 
192
        inode = new_inode(sb);
193
        if (!inode)
194
                return;
195
        inode->i_ino = number+2;
196
        inode->i_blocks = 0;
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        inode->i_blksize = 1024;
198
        inode->i_uid = sbi->setuid ? sbi->uid : current->fsuid;
199
        inode->i_gid = sbi->setgid ? sbi->gid : current->fsgid;
200
        inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
201
        init_special_inode(inode, S_IFCHR|sbi->mode, kdev_t_to_nr(device));
202
 
203
        if ( sbi->inodes[number] ) {
204
                iput(inode);
205
                return;
206
        }
207
        sbi->inodes[number] = inode;
208
}
209
 
210
void devpts_pty_kill(int number)
211
{
212
        struct super_block *sb = devpts_mnt->mnt_sb;
213
        struct devpts_sb_info *sbi = SBI(sb);
214
        struct inode *inode = sbi->inodes[number];
215
 
216
        if ( inode ) {
217
                sbi->inodes[number] = NULL;
218
                inode->i_nlink--;
219
                iput(inode);
220
        }
221
}
222
 
223
static int __init init_devpts_fs(void)
224
{
225
        int err = register_filesystem(&devpts_fs_type);
226
        if (!err) {
227
                devpts_mnt = kern_mount(&devpts_fs_type);
228
                err = PTR_ERR(devpts_mnt);
229
                if (!IS_ERR(devpts_mnt))
230
                        err = 0;
231
#ifdef MODULE
232
                if ( !err ) {
233
                        devpts_upcall_new  = devpts_pty_new;
234
                        devpts_upcall_kill = devpts_pty_kill;
235
                }
236
#endif
237
        }
238
        return err;
239
}
240
 
241
static void __exit exit_devpts_fs(void)
242
{
243
#ifdef MODULE
244
        devpts_upcall_new  = NULL;
245
        devpts_upcall_kill = NULL;
246
#endif
247
        unregister_filesystem(&devpts_fs_type);
248
        kern_umount(devpts_mnt);
249
}
250
 
251
module_init(init_devpts_fs)
252
module_exit(exit_devpts_fs)
253
MODULE_LICENSE("GPL");
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