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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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d6e486868c
Cautious admins may want to restrict access to debugfs. Currently a manual chown/chmod e.g. in an init script is needed to achieve that. Distributions that want to make the mount options configurable need to add extra config files. By allowing to set the root inode's uid, gid and mode via mount options no such hacks are needed anymore. Instead configuration becomes straight forward via fstab. Signed-off-by: Ludwig Nussel <ludwig.nussel@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
692 lines
18 KiB
C
692 lines
18 KiB
C
/*
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* inode.c - part of debugfs, a tiny little debug file system
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*
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* Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
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* Copyright (C) 2004 IBM Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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*
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* debugfs is for people to use instead of /proc or /sys.
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* See Documentation/DocBook/kernel-api for more details.
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*
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*/
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/mount.h>
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#include <linux/pagemap.h>
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#include <linux/init.h>
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#include <linux/kobject.h>
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#include <linux/namei.h>
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#include <linux/debugfs.h>
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#include <linux/fsnotify.h>
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#include <linux/string.h>
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#include <linux/seq_file.h>
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#include <linux/parser.h>
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#include <linux/magic.h>
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#include <linux/slab.h>
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#define DEBUGFS_DEFAULT_MODE 0755
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static struct vfsmount *debugfs_mount;
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static int debugfs_mount_count;
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static bool debugfs_registered;
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static struct inode *debugfs_get_inode(struct super_block *sb, umode_t mode, dev_t dev,
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void *data, const struct file_operations *fops)
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{
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struct inode *inode = new_inode(sb);
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if (inode) {
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inode->i_ino = get_next_ino();
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inode->i_mode = mode;
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inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
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switch (mode & S_IFMT) {
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default:
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init_special_inode(inode, mode, dev);
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break;
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case S_IFREG:
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inode->i_fop = fops ? fops : &debugfs_file_operations;
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inode->i_private = data;
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break;
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case S_IFLNK:
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inode->i_op = &debugfs_link_operations;
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inode->i_fop = fops;
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inode->i_private = data;
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break;
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case S_IFDIR:
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inode->i_op = &simple_dir_inode_operations;
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inode->i_fop = fops ? fops : &simple_dir_operations;
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inode->i_private = data;
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/* directory inodes start off with i_nlink == 2
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* (for "." entry) */
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inc_nlink(inode);
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break;
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}
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}
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return inode;
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}
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/* SMP-safe */
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static int debugfs_mknod(struct inode *dir, struct dentry *dentry,
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umode_t mode, dev_t dev, void *data,
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const struct file_operations *fops)
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{
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struct inode *inode;
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int error = -EPERM;
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if (dentry->d_inode)
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return -EEXIST;
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inode = debugfs_get_inode(dir->i_sb, mode, dev, data, fops);
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if (inode) {
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d_instantiate(dentry, inode);
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dget(dentry);
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error = 0;
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}
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return error;
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}
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static int debugfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode,
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void *data, const struct file_operations *fops)
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{
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int res;
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mode = (mode & (S_IRWXUGO | S_ISVTX)) | S_IFDIR;
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res = debugfs_mknod(dir, dentry, mode, 0, data, fops);
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if (!res) {
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inc_nlink(dir);
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fsnotify_mkdir(dir, dentry);
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}
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return res;
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}
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static int debugfs_link(struct inode *dir, struct dentry *dentry, umode_t mode,
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void *data, const struct file_operations *fops)
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{
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mode = (mode & S_IALLUGO) | S_IFLNK;
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return debugfs_mknod(dir, dentry, mode, 0, data, fops);
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}
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static int debugfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
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void *data, const struct file_operations *fops)
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{
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int res;
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mode = (mode & S_IALLUGO) | S_IFREG;
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res = debugfs_mknod(dir, dentry, mode, 0, data, fops);
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if (!res)
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fsnotify_create(dir, dentry);
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return res;
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}
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static inline int debugfs_positive(struct dentry *dentry)
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{
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return dentry->d_inode && !d_unhashed(dentry);
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}
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struct debugfs_mount_opts {
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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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};
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enum {
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Opt_uid,
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Opt_gid,
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Opt_mode,
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Opt_err
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};
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static const match_table_t tokens = {
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{Opt_uid, "uid=%u"},
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{Opt_gid, "gid=%u"},
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{Opt_mode, "mode=%o"},
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{Opt_err, NULL}
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};
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struct debugfs_fs_info {
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struct debugfs_mount_opts mount_opts;
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};
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static int debugfs_parse_options(char *data, struct debugfs_mount_opts *opts)
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{
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substring_t args[MAX_OPT_ARGS];
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int option;
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int token;
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char *p;
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opts->mode = DEBUGFS_DEFAULT_MODE;
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while ((p = strsep(&data, ",")) != NULL) {
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if (!*p)
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continue;
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token = match_token(p, tokens, args);
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switch (token) {
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case Opt_uid:
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if (match_int(&args[0], &option))
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return -EINVAL;
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opts->uid = option;
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break;
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case Opt_gid:
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if (match_octal(&args[0], &option))
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return -EINVAL;
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opts->gid = option;
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break;
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case Opt_mode:
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if (match_octal(&args[0], &option))
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return -EINVAL;
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opts->mode = option & S_IALLUGO;
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break;
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/*
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* We might like to report bad mount options here;
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* but traditionally debugfs has ignored all mount options
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*/
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}
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}
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return 0;
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}
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static int debugfs_apply_options(struct super_block *sb)
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{
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struct debugfs_fs_info *fsi = sb->s_fs_info;
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struct inode *inode = sb->s_root->d_inode;
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struct debugfs_mount_opts *opts = &fsi->mount_opts;
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inode->i_mode &= ~S_IALLUGO;
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inode->i_mode |= opts->mode;
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inode->i_uid = opts->uid;
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inode->i_gid = opts->gid;
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return 0;
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}
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static int debugfs_remount(struct super_block *sb, int *flags, char *data)
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{
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int err;
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struct debugfs_fs_info *fsi = sb->s_fs_info;
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err = debugfs_parse_options(data, &fsi->mount_opts);
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if (err)
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goto fail;
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debugfs_apply_options(sb);
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fail:
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return err;
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}
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static int debugfs_show_options(struct seq_file *m, struct dentry *root)
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{
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struct debugfs_fs_info *fsi = root->d_sb->s_fs_info;
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struct debugfs_mount_opts *opts = &fsi->mount_opts;
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if (opts->uid != 0)
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seq_printf(m, ",uid=%u", opts->uid);
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if (opts->gid != 0)
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seq_printf(m, ",gid=%u", opts->gid);
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if (opts->mode != DEBUGFS_DEFAULT_MODE)
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seq_printf(m, ",mode=%o", opts->mode);
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return 0;
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}
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static const struct super_operations debugfs_super_operations = {
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.statfs = simple_statfs,
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.remount_fs = debugfs_remount,
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.show_options = debugfs_show_options,
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};
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static int debug_fill_super(struct super_block *sb, void *data, int silent)
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{
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static struct tree_descr debug_files[] = {{""}};
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struct debugfs_fs_info *fsi;
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int err;
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save_mount_options(sb, data);
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fsi = kzalloc(sizeof(struct debugfs_fs_info), GFP_KERNEL);
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sb->s_fs_info = fsi;
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if (!fsi) {
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err = -ENOMEM;
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goto fail;
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}
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err = debugfs_parse_options(data, &fsi->mount_opts);
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if (err)
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goto fail;
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err = simple_fill_super(sb, DEBUGFS_MAGIC, debug_files);
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if (err)
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goto fail;
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sb->s_op = &debugfs_super_operations;
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debugfs_apply_options(sb);
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return 0;
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fail:
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kfree(fsi);
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sb->s_fs_info = NULL;
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return err;
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}
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static struct dentry *debug_mount(struct file_system_type *fs_type,
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int flags, const char *dev_name,
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void *data)
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{
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return mount_single(fs_type, flags, data, debug_fill_super);
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}
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static struct file_system_type debug_fs_type = {
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.owner = THIS_MODULE,
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.name = "debugfs",
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.mount = debug_mount,
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.kill_sb = kill_litter_super,
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};
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static int debugfs_create_by_name(const char *name, umode_t mode,
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struct dentry *parent,
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struct dentry **dentry,
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void *data,
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const struct file_operations *fops)
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{
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int error = 0;
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/* If the parent is not specified, we create it in the root.
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* We need the root dentry to do this, which is in the super
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* block. A pointer to that is in the struct vfsmount that we
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* have around.
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*/
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if (!parent)
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parent = debugfs_mount->mnt_root;
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*dentry = NULL;
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mutex_lock(&parent->d_inode->i_mutex);
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*dentry = lookup_one_len(name, parent, strlen(name));
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if (!IS_ERR(*dentry)) {
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switch (mode & S_IFMT) {
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case S_IFDIR:
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error = debugfs_mkdir(parent->d_inode, *dentry, mode,
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data, fops);
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break;
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case S_IFLNK:
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error = debugfs_link(parent->d_inode, *dentry, mode,
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data, fops);
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break;
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default:
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error = debugfs_create(parent->d_inode, *dentry, mode,
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data, fops);
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break;
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}
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dput(*dentry);
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} else
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error = PTR_ERR(*dentry);
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mutex_unlock(&parent->d_inode->i_mutex);
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return error;
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}
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/**
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* debugfs_create_file - create a file in the debugfs filesystem
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* @name: a pointer to a string containing the name of the file to create.
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* @mode: the permission that the file should have.
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* @parent: a pointer to the parent dentry for this file. This should be a
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* directory dentry if set. If this paramater is NULL, then the
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* file will be created in the root of the debugfs filesystem.
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* @data: a pointer to something that the caller will want to get to later
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* on. The inode.i_private pointer will point to this value on
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* the open() call.
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* @fops: a pointer to a struct file_operations that should be used for
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* this file.
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*
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* This is the basic "create a file" function for debugfs. It allows for a
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* wide range of flexibility in creating a file, or a directory (if you want
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* to create a directory, the debugfs_create_dir() function is
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* recommended to be used instead.)
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*
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* This function will return a pointer to a dentry if it succeeds. This
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* pointer must be passed to the debugfs_remove() function when the file is
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* to be removed (no automatic cleanup happens if your module is unloaded,
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* you are responsible here.) If an error occurs, %NULL will be returned.
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*
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* If debugfs is not enabled in the kernel, the value -%ENODEV will be
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* returned.
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*/
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struct dentry *debugfs_create_file(const char *name, umode_t mode,
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struct dentry *parent, void *data,
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const struct file_operations *fops)
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{
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struct dentry *dentry = NULL;
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int error;
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pr_debug("debugfs: creating file '%s'\n",name);
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error = simple_pin_fs(&debug_fs_type, &debugfs_mount,
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&debugfs_mount_count);
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if (error)
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goto exit;
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error = debugfs_create_by_name(name, mode, parent, &dentry,
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data, fops);
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if (error) {
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dentry = NULL;
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simple_release_fs(&debugfs_mount, &debugfs_mount_count);
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goto exit;
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}
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exit:
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return dentry;
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}
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EXPORT_SYMBOL_GPL(debugfs_create_file);
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/**
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* debugfs_create_dir - create a directory in the debugfs filesystem
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* @name: a pointer to a string containing the name of the directory to
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* create.
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* @parent: a pointer to the parent dentry for this file. This should be a
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* directory dentry if set. If this paramater is NULL, then the
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* directory will be created in the root of the debugfs filesystem.
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*
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* This function creates a directory in debugfs with the given name.
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*
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* This function will return a pointer to a dentry if it succeeds. This
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* pointer must be passed to the debugfs_remove() function when the file is
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* to be removed (no automatic cleanup happens if your module is unloaded,
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* you are responsible here.) If an error occurs, %NULL will be returned.
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*
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* If debugfs is not enabled in the kernel, the value -%ENODEV will be
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* returned.
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*/
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struct dentry *debugfs_create_dir(const char *name, struct dentry *parent)
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{
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return debugfs_create_file(name,
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S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO,
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parent, NULL, NULL);
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}
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EXPORT_SYMBOL_GPL(debugfs_create_dir);
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/**
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* debugfs_create_symlink- create a symbolic link in the debugfs filesystem
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* @name: a pointer to a string containing the name of the symbolic link to
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* create.
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* @parent: a pointer to the parent dentry for this symbolic link. This
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* should be a directory dentry if set. If this paramater is NULL,
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* then the symbolic link will be created in the root of the debugfs
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* filesystem.
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* @target: a pointer to a string containing the path to the target of the
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* symbolic link.
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*
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* This function creates a symbolic link with the given name in debugfs that
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* links to the given target path.
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*
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* This function will return a pointer to a dentry if it succeeds. This
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* pointer must be passed to the debugfs_remove() function when the symbolic
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* link is to be removed (no automatic cleanup happens if your module is
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* unloaded, you are responsible here.) If an error occurs, %NULL will be
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* returned.
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*
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* If debugfs is not enabled in the kernel, the value -%ENODEV will be
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* returned.
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*/
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struct dentry *debugfs_create_symlink(const char *name, struct dentry *parent,
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const char *target)
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{
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struct dentry *result;
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char *link;
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link = kstrdup(target, GFP_KERNEL);
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if (!link)
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return NULL;
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result = debugfs_create_file(name, S_IFLNK | S_IRWXUGO, parent, link,
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NULL);
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if (!result)
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kfree(link);
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return result;
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}
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EXPORT_SYMBOL_GPL(debugfs_create_symlink);
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static int __debugfs_remove(struct dentry *dentry, struct dentry *parent)
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{
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int ret = 0;
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if (debugfs_positive(dentry)) {
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if (dentry->d_inode) {
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dget(dentry);
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switch (dentry->d_inode->i_mode & S_IFMT) {
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case S_IFDIR:
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ret = simple_rmdir(parent->d_inode, dentry);
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break;
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case S_IFLNK:
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kfree(dentry->d_inode->i_private);
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/* fall through */
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default:
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simple_unlink(parent->d_inode, dentry);
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break;
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}
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if (!ret)
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d_delete(dentry);
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dput(dentry);
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}
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}
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return ret;
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}
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/**
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* debugfs_remove - removes a file or directory from the debugfs filesystem
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* @dentry: a pointer to a the dentry of the file or directory to be
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* removed.
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*
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* This function removes a file or directory in debugfs that was previously
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* created with a call to another debugfs function (like
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* debugfs_create_file() or variants thereof.)
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*
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* This function is required to be called in order for the file to be
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* removed, no automatic cleanup of files will happen when a module is
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* removed, you are responsible here.
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*/
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void debugfs_remove(struct dentry *dentry)
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{
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struct dentry *parent;
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int ret;
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if (!dentry)
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return;
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parent = dentry->d_parent;
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if (!parent || !parent->d_inode)
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return;
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mutex_lock(&parent->d_inode->i_mutex);
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ret = __debugfs_remove(dentry, parent);
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mutex_unlock(&parent->d_inode->i_mutex);
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if (!ret)
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simple_release_fs(&debugfs_mount, &debugfs_mount_count);
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}
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EXPORT_SYMBOL_GPL(debugfs_remove);
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/**
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* debugfs_remove_recursive - recursively removes a directory
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|
* @dentry: a pointer to a the dentry of the directory to be removed.
|
|
*
|
|
* This function recursively removes a directory tree in debugfs that
|
|
* was previously created with a call to another debugfs function
|
|
* (like debugfs_create_file() or variants thereof.)
|
|
*
|
|
* This function is required to be called in order for the file to be
|
|
* removed, no automatic cleanup of files will happen when a module is
|
|
* removed, you are responsible here.
|
|
*/
|
|
void debugfs_remove_recursive(struct dentry *dentry)
|
|
{
|
|
struct dentry *child;
|
|
struct dentry *parent;
|
|
|
|
if (!dentry)
|
|
return;
|
|
|
|
parent = dentry->d_parent;
|
|
if (!parent || !parent->d_inode)
|
|
return;
|
|
|
|
parent = dentry;
|
|
mutex_lock(&parent->d_inode->i_mutex);
|
|
|
|
while (1) {
|
|
/*
|
|
* When all dentries under "parent" has been removed,
|
|
* walk up the tree until we reach our starting point.
|
|
*/
|
|
if (list_empty(&parent->d_subdirs)) {
|
|
mutex_unlock(&parent->d_inode->i_mutex);
|
|
if (parent == dentry)
|
|
break;
|
|
parent = parent->d_parent;
|
|
mutex_lock(&parent->d_inode->i_mutex);
|
|
}
|
|
child = list_entry(parent->d_subdirs.next, struct dentry,
|
|
d_u.d_child);
|
|
next_sibling:
|
|
|
|
/*
|
|
* If "child" isn't empty, walk down the tree and
|
|
* remove all its descendants first.
|
|
*/
|
|
if (!list_empty(&child->d_subdirs)) {
|
|
mutex_unlock(&parent->d_inode->i_mutex);
|
|
parent = child;
|
|
mutex_lock(&parent->d_inode->i_mutex);
|
|
continue;
|
|
}
|
|
__debugfs_remove(child, parent);
|
|
if (parent->d_subdirs.next == &child->d_u.d_child) {
|
|
/*
|
|
* Try the next sibling.
|
|
*/
|
|
if (child->d_u.d_child.next != &parent->d_subdirs) {
|
|
child = list_entry(child->d_u.d_child.next,
|
|
struct dentry,
|
|
d_u.d_child);
|
|
goto next_sibling;
|
|
}
|
|
|
|
/*
|
|
* Avoid infinite loop if we fail to remove
|
|
* one dentry.
|
|
*/
|
|
mutex_unlock(&parent->d_inode->i_mutex);
|
|
break;
|
|
}
|
|
simple_release_fs(&debugfs_mount, &debugfs_mount_count);
|
|
}
|
|
|
|
parent = dentry->d_parent;
|
|
mutex_lock(&parent->d_inode->i_mutex);
|
|
__debugfs_remove(dentry, parent);
|
|
mutex_unlock(&parent->d_inode->i_mutex);
|
|
simple_release_fs(&debugfs_mount, &debugfs_mount_count);
|
|
}
|
|
EXPORT_SYMBOL_GPL(debugfs_remove_recursive);
|
|
|
|
/**
|
|
* debugfs_rename - rename a file/directory in the debugfs filesystem
|
|
* @old_dir: a pointer to the parent dentry for the renamed object. This
|
|
* should be a directory dentry.
|
|
* @old_dentry: dentry of an object to be renamed.
|
|
* @new_dir: a pointer to the parent dentry where the object should be
|
|
* moved. This should be a directory dentry.
|
|
* @new_name: a pointer to a string containing the target name.
|
|
*
|
|
* This function renames a file/directory in debugfs. The target must not
|
|
* exist for rename to succeed.
|
|
*
|
|
* This function will return a pointer to old_dentry (which is updated to
|
|
* reflect renaming) if it succeeds. If an error occurs, %NULL will be
|
|
* returned.
|
|
*
|
|
* If debugfs is not enabled in the kernel, the value -%ENODEV will be
|
|
* returned.
|
|
*/
|
|
struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
|
|
struct dentry *new_dir, const char *new_name)
|
|
{
|
|
int error;
|
|
struct dentry *dentry = NULL, *trap;
|
|
const char *old_name;
|
|
|
|
trap = lock_rename(new_dir, old_dir);
|
|
/* Source or destination directories don't exist? */
|
|
if (!old_dir->d_inode || !new_dir->d_inode)
|
|
goto exit;
|
|
/* Source does not exist, cyclic rename, or mountpoint? */
|
|
if (!old_dentry->d_inode || old_dentry == trap ||
|
|
d_mountpoint(old_dentry))
|
|
goto exit;
|
|
dentry = lookup_one_len(new_name, new_dir, strlen(new_name));
|
|
/* Lookup failed, cyclic rename or target exists? */
|
|
if (IS_ERR(dentry) || dentry == trap || dentry->d_inode)
|
|
goto exit;
|
|
|
|
old_name = fsnotify_oldname_init(old_dentry->d_name.name);
|
|
|
|
error = simple_rename(old_dir->d_inode, old_dentry, new_dir->d_inode,
|
|
dentry);
|
|
if (error) {
|
|
fsnotify_oldname_free(old_name);
|
|
goto exit;
|
|
}
|
|
d_move(old_dentry, dentry);
|
|
fsnotify_move(old_dir->d_inode, new_dir->d_inode, old_name,
|
|
S_ISDIR(old_dentry->d_inode->i_mode),
|
|
NULL, old_dentry);
|
|
fsnotify_oldname_free(old_name);
|
|
unlock_rename(new_dir, old_dir);
|
|
dput(dentry);
|
|
return old_dentry;
|
|
exit:
|
|
if (dentry && !IS_ERR(dentry))
|
|
dput(dentry);
|
|
unlock_rename(new_dir, old_dir);
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(debugfs_rename);
|
|
|
|
/**
|
|
* debugfs_initialized - Tells whether debugfs has been registered
|
|
*/
|
|
bool debugfs_initialized(void)
|
|
{
|
|
return debugfs_registered;
|
|
}
|
|
EXPORT_SYMBOL_GPL(debugfs_initialized);
|
|
|
|
|
|
static struct kobject *debug_kobj;
|
|
|
|
static int __init debugfs_init(void)
|
|
{
|
|
int retval;
|
|
|
|
debug_kobj = kobject_create_and_add("debug", kernel_kobj);
|
|
if (!debug_kobj)
|
|
return -EINVAL;
|
|
|
|
retval = register_filesystem(&debug_fs_type);
|
|
if (retval)
|
|
kobject_put(debug_kobj);
|
|
else
|
|
debugfs_registered = true;
|
|
|
|
return retval;
|
|
}
|
|
core_initcall(debugfs_init);
|
|
|