81 lines
1.8 KiB
C
81 lines
1.8 KiB
C
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/seq_file.h>
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#include <linux/fs.h>
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#include <linux/mount.h>
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#include <linux/path.h>
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#include <linux/proc_fs.h>
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#include <linux/nsproxy.h>
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#include <../fs/mount.h>
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#define PROCFS_MAX_SIZE 1024
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#define PROCFS_NAME "mymounts"
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MODULE_LICENSE("GPL");
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static int ft_proc_open(struct inode *inode, struct file *file);
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static struct proc_dir_entry *proc_file;
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static const struct proc_ops proc_file_ops = {
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.proc_open = ft_proc_open,
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.proc_read = seq_read,
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.proc_lseek = seq_lseek,
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.proc_release = single_release,
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};
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static void show_mount(struct seq_file *m, struct mount *mnt)
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{
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struct path mnt_path = {
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.dentry = mnt->mnt.mnt_root,
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.mnt = &mnt->mnt
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};
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seq_printf(m, "%-15s", mnt->mnt_devname);
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seq_path(m, &mnt_path, " \t\n\\");
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seq_putc(m, '\n');
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}
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static void traverse_mount_tree(struct seq_file *m, struct rb_node *node)
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{
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struct mount *mnt;
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if (!node)
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return;
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mnt = rb_entry(node, struct mount, mnt_node);
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show_mount(m, mnt);
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traverse_mount_tree(m, node->rb_left);
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traverse_mount_tree(m, node->rb_right);
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}
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static int ft_proc_show(struct seq_file *m, void *v)
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{
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struct rb_root *root = ¤t->nsproxy->mnt_ns->mounts;
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traverse_mount_tree(m, root->rb_node);
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return 0;
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}
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static int ft_proc_open(struct inode *inode, struct file *file)
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{
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return single_open(file, ft_proc_show, NULL);
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}
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static int __init mymounts_init(void)
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{
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proc_file = proc_create(PROCFS_NAME, 0644, NULL, &proc_file_ops);
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if (proc_file == NULL) {
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proc_remove(proc_file);
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pr_err("could not initialize /proc/%s\n", PROCFS_NAME);
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return -ENOMEM;
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}
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return 0;
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}
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static void __exit mymounts_exit(void)
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{
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proc_remove(proc_file);
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}
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module_init(mymounts_init);
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module_exit(mymounts_exit);
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