internal.h

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/* internal.h: internal procfs definitions
 *
 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells ([email protected])
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#include <linux/sched.h>
#include <linux/proc_fs.h>
struct  ctl_table_header;
struct  mempolicy;

extern struct proc_dir_entry proc_root;
#ifdef CONFIG_PROC_SYSCTL
extern int proc_sys_init(void);
extern void sysctl_head_put(struct ctl_table_header *head);
#else
static inline void proc_sys_init(void) { }
static inline void sysctl_head_put(struct ctl_table_header *head) { }
#endif
#ifdef CONFIG_NET
extern int proc_net_init(void);
#else
static inline int proc_net_init(void) { return 0; }
#endif

struct vmalloc_info {
    unsigned long   used;
    unsigned long   largest_chunk;
};

#ifdef CONFIG_MMU
#define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
extern void get_vmalloc_info(struct vmalloc_info *vmi);
#else

#define VMALLOC_TOTAL 0UL
#define get_vmalloc_info(vmi)           \
do {                        \
    (vmi)->used = 0;            \
    (vmi)->largest_chunk = 0;       \
} while(0)
#endif

extern int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns,
                struct pid *pid, struct task_struct *task);
extern int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns,
                struct pid *pid, struct task_struct *task);
extern int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
                struct pid *pid, struct task_struct *task);
extern int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns,
                struct pid *pid, struct task_struct *task);
extern loff_t mem_lseek(struct file *file, loff_t offset, int orig);

extern const struct file_operations proc_tid_children_operations;
extern const struct file_operations proc_pid_maps_operations;
extern const struct file_operations proc_tid_maps_operations;
extern const struct file_operations proc_pid_numa_maps_operations;
extern const struct file_operations proc_tid_numa_maps_operations;
extern const struct file_operations proc_pid_smaps_operations;
extern const struct file_operations proc_tid_smaps_operations;
extern const struct file_operations proc_clear_refs_operations;
extern const struct file_operations proc_pagemap_operations;
extern const struct file_operations proc_net_operations;
extern const struct inode_operations proc_net_inode_operations;
extern const struct inode_operations proc_pid_link_inode_operations;

struct proc_maps_private {
    struct pid *pid;
    struct task_struct *task;
#ifdef CONFIG_MMU
    struct vm_area_struct *tail_vma;
#endif
#ifdef CONFIG_NUMA
    struct mempolicy *task_mempolicy;
#endif
};

void proc_init_inodecache(void);

static inline struct pid *proc_pid(struct inode *inode)
{
    return PROC_I(inode)->pid;
}

static inline struct task_struct *get_proc_task(struct inode *inode)
{
    return get_pid_task(proc_pid(inode), PIDTYPE_PID);
}

static inline int proc_fd(struct inode *inode)
{
    return PROC_I(inode)->fd;
}

static inline int task_dumpable(struct task_struct *task)
{
    int dumpable = 0;
    struct mm_struct *mm;

    task_lock(task);
    mm = task->mm;
    if (mm)
        dumpable = get_dumpable(mm);
    task_unlock(task);
    if (dumpable == SUID_DUMPABLE_ENABLED)
        return 1;
    return 0;
}

static inline int pid_delete_dentry(const struct dentry * dentry)
{
    /* Is the task we represent dead?
     * If so, then don't put the dentry on the lru list,
     * kill it immediately.
     */
    return !proc_pid(dentry->d_inode)->tasks[PIDTYPE_PID].first;
}

static inline unsigned name_to_int(struct dentry *dentry)
{
    const char *name = dentry->d_name.name;
    int len = dentry->d_name.len;
    unsigned n = 0;

    if (len > 1 && *name == '0')
        goto out;
    while (len-- > 0) {
        unsigned c = *name++ - '0';
        if (c > 9)
            goto out;
        if (n >= (~0U-9)/10)
            goto out;
        n *= 10;
        n += c;
    }
    return n;
out:
    return ~0U;
}

struct dentry *proc_lookup_de(struct proc_dir_entry *de, struct inode *ino,
        struct dentry *dentry);
int proc_readdir_de(struct proc_dir_entry *de, struct file *filp, void *dirent,
        filldir_t filldir);

struct pde_opener {
    struct inode *inode;
    struct file *file;
    int (*release)(struct inode *, struct file *);
    struct list_head lh;
};
void pde_users_dec(struct proc_dir_entry *pde);

extern spinlock_t proc_subdir_lock;

struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, unsigned int);
int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir);
unsigned long task_vsize(struct mm_struct *);
unsigned long task_statm(struct mm_struct *,
    unsigned long *, unsigned long *, unsigned long *, unsigned long *);
void task_mem(struct seq_file *, struct mm_struct *);

static inline struct proc_dir_entry *pde_get(struct proc_dir_entry *pde)
{
    atomic_inc(&pde->count);
    return pde;
}
void pde_put(struct proc_dir_entry *pde);

int proc_fill_super(struct super_block *);
struct inode *proc_get_inode(struct super_block *, struct proc_dir_entry *);
int proc_remount(struct super_block *sb, int *flags, char *data);

/*
 * These are generic /proc routines that use the internal
 * "struct proc_dir_entry" tree to traverse the filesystem.
 *
 * The /proc root directory has extended versions to take care
 * of the /proc/<pid> subdirectories.
 */
int proc_readdir(struct file *, void *, filldir_t);
struct dentry *proc_lookup(struct inode *, struct dentry *, unsigned int);



/* Lookups */
typedef struct dentry *instantiate_t(struct inode *, struct dentry *,
                struct task_struct *, const void *);
int proc_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
    const char *name, int len,
    instantiate_t instantiate, struct task_struct *task, const void *ptr);
int pid_revalidate(struct dentry *dentry, unsigned int flags);
struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task);
extern const struct dentry_operations pid_dentry_operations;
int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat);
int proc_setattr(struct dentry *dentry, struct iattr *attr);

extern const struct inode_operations proc_ns_dir_inode_operations;
extern const struct file_operations proc_ns_dir_operations;