![Miklos Szeredi](/assets/img/avatar_default.png)
Add a .show_options super operation to capifs. Use generic_show_options() and save the complete option string in capifs_remount(). Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Acked-by: Karsten Keil <kkeil@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
223 lines
5 KiB
C
223 lines
5 KiB
C
/* $Id: capifs.c,v 1.1.2.3 2004/01/16 21:09:26 keil Exp $
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*
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* Copyright 2000 by Carsten Paeth <calle@calle.de>
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*
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* Heavily based on devpts filesystem from H. Peter Anvin
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*
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* This software may be used and distributed according to the terms
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* of the GNU General Public License, incorporated herein by reference.
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*
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*/
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#include <linux/fs.h>
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#include <linux/mount.h>
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#include <linux/namei.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/ctype.h>
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#include <linux/sched.h> /* current */
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#include "capifs.h"
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MODULE_DESCRIPTION("CAPI4Linux: /dev/capi/ filesystem");
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MODULE_AUTHOR("Carsten Paeth");
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MODULE_LICENSE("GPL");
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/* ------------------------------------------------------------------ */
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static char *revision = "$Revision: 1.1.2.3 $";
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/* ------------------------------------------------------------------ */
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#define CAPIFS_SUPER_MAGIC (('C'<<8)|'N')
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static struct vfsmount *capifs_mnt;
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static struct dentry *capifs_root;
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static struct {
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int setuid;
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int setgid;
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uid_t uid;
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gid_t gid;
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umode_t mode;
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} config = {.mode = 0600};
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/* ------------------------------------------------------------------ */
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static int capifs_remount(struct super_block *s, int *flags, char *data)
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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;
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char *new_opt = kstrdup(data, GFP_KERNEL);
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this_char = NULL;
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while ((this_char = strsep(&data, ",")) != NULL) {
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int n;
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char dummy;
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if (!*this_char)
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continue;
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if (sscanf(this_char, "uid=%i%c", &n, &dummy) == 1) {
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setuid = 1;
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uid = n;
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} else if (sscanf(this_char, "gid=%i%c", &n, &dummy) == 1) {
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setgid = 1;
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gid = n;
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} else if (sscanf(this_char, "mode=%o%c", &n, &dummy) == 1)
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mode = n & ~S_IFMT;
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else {
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printk("capifs: called with bogus options\n");
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return -EINVAL;
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}
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}
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kfree(s->s_options);
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s->s_options = new_opt;
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config.setuid = setuid;
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config.setgid = setgid;
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config.uid = uid;
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config.gid = gid;
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config.mode = mode;
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return 0;
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}
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static struct super_operations capifs_sops =
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{
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.statfs = simple_statfs,
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.remount_fs = capifs_remount,
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.show_options = generic_show_options,
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};
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static int
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capifs_fill_super(struct super_block *s, void *data, int silent)
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{
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struct inode * inode;
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s->s_blocksize = 1024;
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s->s_blocksize_bits = 10;
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s->s_magic = CAPIFS_SUPER_MAGIC;
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s->s_op = &capifs_sops;
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s->s_time_gran = 1;
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inode = new_inode(s);
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if (!inode)
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goto fail;
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inode->i_ino = 1;
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inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
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inode->i_blocks = 0;
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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 = &simple_dir_inode_operations;
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inode->i_fop = &simple_dir_operations;
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inode->i_nlink = 2;
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capifs_root = s->s_root = d_alloc_root(inode);
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if (s->s_root)
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return 0;
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printk("capifs: get root dentry failed\n");
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iput(inode);
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fail:
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return -ENOMEM;
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}
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static int capifs_get_sb(struct file_system_type *fs_type,
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int flags, const char *dev_name, void *data, struct vfsmount *mnt)
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{
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return get_sb_single(fs_type, flags, data, capifs_fill_super, mnt);
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}
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static struct file_system_type capifs_fs_type = {
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.owner = THIS_MODULE,
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.name = "capifs",
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.get_sb = capifs_get_sb,
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.kill_sb = kill_anon_super,
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};
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static struct dentry *get_node(int num)
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{
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char s[10];
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struct dentry *root = capifs_root;
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mutex_lock(&root->d_inode->i_mutex);
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return lookup_one_len(s, root, sprintf(s, "%d", num));
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}
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void capifs_new_ncci(unsigned int number, dev_t device)
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{
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struct dentry *dentry;
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struct inode *inode = new_inode(capifs_mnt->mnt_sb);
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if (!inode)
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return;
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inode->i_ino = number+2;
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inode->i_uid = config.setuid ? config.uid : current->fsuid;
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inode->i_gid = config.setgid ? config.gid : current->fsgid;
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inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
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init_special_inode(inode, S_IFCHR|config.mode, device);
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//inode->i_op = &capifs_file_inode_operations;
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dentry = get_node(number);
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if (!IS_ERR(dentry) && !dentry->d_inode)
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d_instantiate(dentry, inode);
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mutex_unlock(&capifs_root->d_inode->i_mutex);
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}
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void capifs_free_ncci(unsigned int number)
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{
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struct dentry *dentry = get_node(number);
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if (!IS_ERR(dentry)) {
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struct inode *inode = dentry->d_inode;
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if (inode) {
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inode->i_nlink--;
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d_delete(dentry);
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dput(dentry);
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}
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dput(dentry);
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}
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mutex_unlock(&capifs_root->d_inode->i_mutex);
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}
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static int __init capifs_init(void)
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{
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char rev[32];
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char *p;
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int err;
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if ((p = strchr(revision, ':')) != 0 && p[1]) {
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strlcpy(rev, p + 2, sizeof(rev));
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if ((p = strchr(rev, '$')) != 0 && p > rev)
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*(p-1) = 0;
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} else
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strcpy(rev, "1.0");
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err = register_filesystem(&capifs_fs_type);
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if (!err) {
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capifs_mnt = kern_mount(&capifs_fs_type);
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if (IS_ERR(capifs_mnt)) {
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err = PTR_ERR(capifs_mnt);
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unregister_filesystem(&capifs_fs_type);
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}
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}
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if (!err)
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printk(KERN_NOTICE "capifs: Rev %s\n", rev);
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return err;
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}
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static void __exit capifs_exit(void)
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{
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unregister_filesystem(&capifs_fs_type);
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mntput(capifs_mnt);
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}
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EXPORT_SYMBOL(capifs_new_ncci);
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EXPORT_SYMBOL(capifs_free_ncci);
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module_init(capifs_init);
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module_exit(capifs_exit);
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