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fs/autofs4/autofs_i.h
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/* * Copyright 1997-1998 Transmeta Corporation - All Rights Reserved * Copyright 2005-2006 Ian Kent <raven@themaw.net> |
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* * This file is part of the Linux kernel and is made available under * the terms of the GNU General Public License, version 2, or at your * option, any later version, incorporated herein by reference. |
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*/ |
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/* Internal header file for autofs */ #include <linux/auto_fs4.h> |
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#include <linux/auto_dev-ioctl.h> |
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#include <linux/mutex.h> |
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#include <linux/spinlock.h> |
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#include <linux/list.h> /* This is the range of ioctl() numbers we claim as ours */ #define AUTOFS_IOC_FIRST AUTOFS_IOC_READY #define AUTOFS_IOC_COUNT 32 |
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#define AUTOFS_DEV_IOCTL_IOC_FIRST (AUTOFS_DEV_IOCTL_VERSION) |
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#define AUTOFS_DEV_IOCTL_IOC_COUNT \ (AUTOFS_DEV_IOCTL_ISMOUNTPOINT_CMD - AUTOFS_DEV_IOCTL_VERSION_CMD) |
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#include <linux/kernel.h> #include <linux/slab.h> #include <linux/time.h> #include <linux/string.h> #include <linux/wait.h> #include <linux/sched.h> #include <linux/mount.h> #include <linux/namei.h> #include <asm/current.h> |
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#include <linux/uaccess.h> |
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#ifdef pr_fmt #undef pr_fmt #endif #define pr_fmt(fmt) KBUILD_MODNAME ":pid:%d:%s: " fmt, current->pid, __func__ |
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/* * Unified info structure. This is pointed to by both the dentry and * inode structures. Each file in the filesystem has an instance of this * structure. It holds a reference to the dentry, so dentries are never * flushed while the file exists. All name lookups are dealt with at the * dentry level, although the filesystem can interfere in the validation * process. Readdir is implemented by traversing the dentry lists. */ |
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struct autofs_info { struct dentry *dentry; struct inode *inode; int flags; |
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struct completion expire_complete; |
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struct list_head active; |
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int active_count; |
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struct list_head expiring; |
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struct autofs_sb_info *sbi; unsigned long last_used; |
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atomic_t count; |
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kuid_t uid; kgid_t gid; |
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}; |
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#define AUTOFS_INF_EXPIRING (1<<0) /* dentry in the process of expiring */ |
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#define AUTOFS_INF_WANT_EXPIRE (1<<1) /* the dentry is being considered |
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* for expiry, so RCU_walk is |
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* not permitted. If it progresses to * actual expiry attempt, the flag is * not cleared when EXPIRING is set - * in that case it gets cleared only * when it comes to clearing EXPIRING. |
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*/ |
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#define AUTOFS_INF_PENDING (1<<2) /* dentry pending mount */ |
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struct autofs_wait_queue { wait_queue_head_t queue; struct autofs_wait_queue *next; autofs_wqt_t wait_queue_token; /* We use the following to see what we are waiting for */ |
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struct qstr name; |
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u32 dev; u64 ino; |
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kuid_t uid; kgid_t gid; |
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pid_t pid; pid_t tgid; |
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/* This is for status reporting upon return */ int status; |
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unsigned int wait_ctr; |
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}; #define AUTOFS_SBI_MAGIC 0x6d4a556d struct autofs_sb_info { u32 magic; |
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int pipefd; |
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struct file *pipe; |
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struct pid *oz_pgrp; |
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int catatonic; int version; int sub_version; |
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int min_proto; int max_proto; |
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unsigned long exp_timeout; |
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unsigned int type; |
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struct super_block *sb; |
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struct mutex wq_mutex; |
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struct mutex pipe_mutex; |
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spinlock_t fs_lock; |
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struct autofs_wait_queue *queues; /* Wait queue pointer */ |
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spinlock_t lookup_lock; |
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struct list_head active_list; |
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struct list_head expiring_list; |
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struct rcu_head rcu; |
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}; static inline struct autofs_sb_info *autofs4_sbi(struct super_block *sb) { return (struct autofs_sb_info *)(sb->s_fs_info); } static inline struct autofs_info *autofs4_dentry_ino(struct dentry *dentry) { return (struct autofs_info *)(dentry->d_fsdata); } /* autofs4_oz_mode(): do we see the man behind the curtain? (The |
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* processes which do manipulations for us in user space sees the raw * filesystem without "magic".) */ static inline int autofs4_oz_mode(struct autofs_sb_info *sbi) { |
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return sbi->catatonic || task_pgrp(current) == sbi->oz_pgrp; |
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} |
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struct inode *autofs4_get_inode(struct super_block *, umode_t); |
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void autofs4_free_ino(struct autofs_info *); /* Expiration */ int is_autofs4_dentry(struct dentry *); |
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int autofs4_expire_wait(const struct path *path, int rcu_walk); |
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int autofs4_expire_run(struct super_block *, struct vfsmount *, |
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struct autofs_sb_info *, struct autofs_packet_expire __user *); |
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int autofs4_do_expire_multi(struct super_block *sb, struct vfsmount *mnt, struct autofs_sb_info *sbi, int when); |
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int autofs4_expire_multi(struct super_block *, struct vfsmount *, |
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struct autofs_sb_info *, int __user *); |
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struct dentry *autofs4_expire_direct(struct super_block *sb, struct vfsmount *mnt, struct autofs_sb_info *sbi, int how); struct dentry *autofs4_expire_indirect(struct super_block *sb, struct vfsmount *mnt, struct autofs_sb_info *sbi, int how); /* Device node initialization */ int autofs_dev_ioctl_init(void); void autofs_dev_ioctl_exit(void); |
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/* Operations structures */ |
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extern const struct inode_operations autofs4_symlink_inode_operations; extern const struct inode_operations autofs4_dir_inode_operations; |
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extern const struct file_operations autofs4_dir_operations; extern const struct file_operations autofs4_root_operations; |
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extern const struct dentry_operations autofs4_dentry_operations; |
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/* VFS automount flags management functions */ |
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static inline void __managed_dentry_set_managed(struct dentry *dentry) { dentry->d_flags |= (DCACHE_NEED_AUTOMOUNT|DCACHE_MANAGE_TRANSIT); } static inline void managed_dentry_set_managed(struct dentry *dentry) { spin_lock(&dentry->d_lock); __managed_dentry_set_managed(dentry); spin_unlock(&dentry->d_lock); } static inline void __managed_dentry_clear_managed(struct dentry *dentry) { dentry->d_flags &= ~(DCACHE_NEED_AUTOMOUNT|DCACHE_MANAGE_TRANSIT); } static inline void managed_dentry_clear_managed(struct dentry *dentry) { spin_lock(&dentry->d_lock); __managed_dentry_clear_managed(dentry); spin_unlock(&dentry->d_lock); } |
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/* Initializing function */ int autofs4_fill_super(struct super_block *, void *, int); |
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struct autofs_info *autofs4_new_ino(struct autofs_sb_info *); void autofs4_clean_ino(struct autofs_info *); |
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static inline int autofs_prepare_pipe(struct file *pipe) { |
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if (!(pipe->f_mode & FMODE_CAN_WRITE)) |
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return -EINVAL; |
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if (!S_ISFIFO(file_inode(pipe)->i_mode)) |
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return -EINVAL; /* We want a packet pipe */ pipe->f_flags |= O_DIRECT; return 0; } |
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/* Queue management functions */ |
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int autofs4_wait(struct autofs_sb_info *, const struct path *, enum autofs_notify); |
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int autofs4_wait_release(struct autofs_sb_info *, autofs_wqt_t, int); |
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void autofs4_catatonic_mode(struct autofs_sb_info *); |
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static inline u32 autofs4_get_dev(struct autofs_sb_info *sbi) { return new_encode_dev(sbi->sb->s_dev); } static inline u64 autofs4_get_ino(struct autofs_sb_info *sbi) { |
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return d_inode(sbi->sb->s_root)->i_ino; |
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} |
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static inline void __autofs4_add_expiring(struct dentry *dentry) { struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); struct autofs_info *ino = autofs4_dentry_ino(dentry); |
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if (ino) { if (list_empty(&ino->expiring)) list_add(&ino->expiring, &sbi->expiring_list); } |
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} |
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static inline void autofs4_add_expiring(struct dentry *dentry) { struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); struct autofs_info *ino = autofs4_dentry_ino(dentry); |
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if (ino) { spin_lock(&sbi->lookup_lock); if (list_empty(&ino->expiring)) list_add(&ino->expiring, &sbi->expiring_list); spin_unlock(&sbi->lookup_lock); } |
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} static inline void autofs4_del_expiring(struct dentry *dentry) { struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); struct autofs_info *ino = autofs4_dentry_ino(dentry); |
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if (ino) { spin_lock(&sbi->lookup_lock); if (!list_empty(&ino->expiring)) list_del_init(&ino->expiring); spin_unlock(&sbi->lookup_lock); } |
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} |
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void autofs4_kill_sb(struct super_block *); |