![Arjan van de Ven](/assets/img/avatar_default.png)
This is a conversion to make the various file_operations structs in fs/ const. Basically a regexp job, with a few manual fixups The goal is both to increase correctness (harder to accidentally write to shared datastructures) and reducing the false sharing of cachelines with things that get dirty in .data (while .rodata is nicely read only and thus cache clean) Signed-off-by: Arjan van de Ven <arjan@infradead.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
166 lines
4.6 KiB
C
166 lines
4.6 KiB
C
/* -*- linux-c -*- ------------------------------------------------------- *
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*
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* linux/fs/autofs/autofs_i.h
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*
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* Copyright 1997-1998 Transmeta Corporation - All Rights Reserved
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*
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* This file is part of the Linux kernel and is made available under
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* the terms of the GNU General Public License, version 2, or at your
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* option, any later version, incorporated herein by reference.
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*
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* ----------------------------------------------------------------------- */
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/* Internal header file for autofs */
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#include <linux/auto_fs.h>
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/* This is the range of ioctl() numbers we claim as ours */
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#define AUTOFS_IOC_FIRST AUTOFS_IOC_READY
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#define AUTOFS_IOC_COUNT 32
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/time.h>
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#include <linux/string.h>
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#include <linux/wait.h>
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#include <linux/dcache.h>
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#include <linux/namei.h>
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#include <linux/mount.h>
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#include <linux/sched.h>
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#include <asm/current.h>
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#include <asm/uaccess.h>
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#ifdef DEBUG
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#define DPRINTK(D) (printk D)
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#else
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#define DPRINTK(D) ((void)0)
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#endif
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#define AUTOFS_SUPER_MAGIC 0x0187
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/*
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* If the daemon returns a negative response (AUTOFS_IOC_FAIL) then the
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* kernel will keep the negative response cached for up to the time given
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* here, although the time can be shorter if the kernel throws the dcache
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* entry away. This probably should be settable from user space.
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*/
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#define AUTOFS_NEGATIVE_TIMEOUT (60*HZ) /* 1 minute */
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/* Structures associated with the root directory hash table */
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#define AUTOFS_HASH_SIZE 67
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struct autofs_dir_ent {
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int hash;
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char *name;
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int len;
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ino_t ino;
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struct dentry *dentry;
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/* Linked list of entries */
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struct autofs_dir_ent *next;
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struct autofs_dir_ent **back;
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/* The following entries are for the expiry system */
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unsigned long last_usage;
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struct list_head exp;
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};
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struct autofs_dirhash {
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struct autofs_dir_ent *h[AUTOFS_HASH_SIZE];
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struct list_head expiry_head;
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};
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struct autofs_wait_queue {
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wait_queue_head_t queue;
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struct autofs_wait_queue *next;
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autofs_wqt_t wait_queue_token;
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/* We use the following to see what we are waiting for */
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int hash;
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int len;
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char *name;
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/* This is for status reporting upon return */
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int status;
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int wait_ctr;
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};
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struct autofs_symlink {
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char *data;
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int len;
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time_t mtime;
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};
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#define AUTOFS_MAX_SYMLINKS 256
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#define AUTOFS_ROOT_INO 1
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#define AUTOFS_FIRST_SYMLINK 2
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#define AUTOFS_FIRST_DIR_INO (AUTOFS_FIRST_SYMLINK+AUTOFS_MAX_SYMLINKS)
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#define AUTOFS_SYMLINK_BITMAP_LEN \
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((AUTOFS_MAX_SYMLINKS+((sizeof(long)*1)-1))/(sizeof(long)*8))
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#define AUTOFS_SBI_MAGIC 0x6d4a556d
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struct autofs_sb_info {
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u32 magic;
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struct file *pipe;
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pid_t oz_pgrp;
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int catatonic;
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struct super_block *sb;
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unsigned long exp_timeout;
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ino_t next_dir_ino;
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struct autofs_wait_queue *queues; /* Wait queue pointer */
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struct autofs_dirhash dirhash; /* Root directory hash */
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struct autofs_symlink symlink[AUTOFS_MAX_SYMLINKS];
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unsigned long symlink_bitmap[AUTOFS_SYMLINK_BITMAP_LEN];
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};
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static inline struct autofs_sb_info *autofs_sbi(struct super_block *sb)
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{
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return (struct autofs_sb_info *)(sb->s_fs_info);
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}
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/* autofs_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
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filesystem without "magic".) */
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static inline int autofs_oz_mode(struct autofs_sb_info *sbi) {
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return sbi->catatonic || process_group(current) == sbi->oz_pgrp;
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}
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/* Hash operations */
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void autofs_initialize_hash(struct autofs_dirhash *);
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struct autofs_dir_ent *autofs_hash_lookup(const struct autofs_dirhash *,struct qstr *);
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void autofs_hash_insert(struct autofs_dirhash *,struct autofs_dir_ent *);
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void autofs_hash_delete(struct autofs_dir_ent *);
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struct autofs_dir_ent *autofs_hash_enum(const struct autofs_dirhash *,off_t *,struct autofs_dir_ent *);
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void autofs_hash_dputall(struct autofs_dirhash *);
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void autofs_hash_nuke(struct autofs_sb_info *);
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/* Expiration-handling functions */
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void autofs_update_usage(struct autofs_dirhash *,struct autofs_dir_ent *);
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struct autofs_dir_ent *autofs_expire(struct super_block *,struct autofs_sb_info *, struct vfsmount *mnt);
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/* Operations structures */
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extern struct inode_operations autofs_root_inode_operations;
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extern struct inode_operations autofs_symlink_inode_operations;
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extern const struct file_operations autofs_root_operations;
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/* Initializing function */
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int autofs_fill_super(struct super_block *, void *, int);
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/* Queue management functions */
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int autofs_wait(struct autofs_sb_info *,struct qstr *);
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int autofs_wait_release(struct autofs_sb_info *,autofs_wqt_t,int);
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void autofs_catatonic_mode(struct autofs_sb_info *);
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#ifdef DEBUG
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void autofs_say(const char *name, int len);
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#else
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#define autofs_say(n,l) ((void)0)
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#endif
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