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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/autofs/autofs_i.h | |
download | linux-fsl-qoriq-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'fs/autofs/autofs_i.h')
-rw-r--r-- | fs/autofs/autofs_i.h | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/fs/autofs/autofs_i.h b/fs/autofs/autofs_i.h new file mode 100644 index 0000000..6171431 --- /dev/null +++ b/fs/autofs/autofs_i.h @@ -0,0 +1,164 @@ +/* -*- linux-c -*- ------------------------------------------------------- * + * + * linux/fs/autofs/autofs_i.h + * + * Copyright 1997-1998 Transmeta Corporation - All Rights Reserved + * + * 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. + * + * ----------------------------------------------------------------------- */ + +/* Internal header file for autofs */ + +#include <linux/auto_fs.h> + +/* This is the range of ioctl() numbers we claim as ours */ +#define AUTOFS_IOC_FIRST AUTOFS_IOC_READY +#define AUTOFS_IOC_COUNT 32 + +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/time.h> +#include <linux/string.h> +#include <linux/wait.h> +#include <linux/dcache.h> +#include <linux/namei.h> +#include <linux/mount.h> +#include <linux/sched.h> + +#include <asm/current.h> +#include <asm/uaccess.h> + +#ifdef DEBUG +#define DPRINTK(D) (printk D) +#else +#define DPRINTK(D) ((void)0) +#endif + +#define AUTOFS_SUPER_MAGIC 0x0187 + +/* + * If the daemon returns a negative response (AUTOFS_IOC_FAIL) then the + * kernel will keep the negative response cached for up to the time given + * here, although the time can be shorter if the kernel throws the dcache + * entry away. This probably should be settable from user space. + */ +#define AUTOFS_NEGATIVE_TIMEOUT (60*HZ) /* 1 minute */ + +/* Structures associated with the root directory hash table */ + +#define AUTOFS_HASH_SIZE 67 + +struct autofs_dir_ent { + int hash; + char *name; + int len; + ino_t ino; + struct dentry *dentry; + /* Linked list of entries */ + struct autofs_dir_ent *next; + struct autofs_dir_ent **back; + /* The following entries are for the expiry system */ + unsigned long last_usage; + struct list_head exp; +}; + +struct autofs_dirhash { + struct autofs_dir_ent *h[AUTOFS_HASH_SIZE]; + struct list_head expiry_head; +}; + +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 */ + int hash; + int len; + char *name; + /* This is for status reporting upon return */ + int status; + int wait_ctr; +}; + +struct autofs_symlink { + char *data; + int len; + time_t mtime; +}; + +#define AUTOFS_MAX_SYMLINKS 256 + +#define AUTOFS_ROOT_INO 1 +#define AUTOFS_FIRST_SYMLINK 2 +#define AUTOFS_FIRST_DIR_INO (AUTOFS_FIRST_SYMLINK+AUTOFS_MAX_SYMLINKS) + +#define AUTOFS_SYMLINK_BITMAP_LEN \ + ((AUTOFS_MAX_SYMLINKS+((sizeof(long)*1)-1))/(sizeof(long)*8)) + +#define AUTOFS_SBI_MAGIC 0x6d4a556d + +struct autofs_sb_info { + u32 magic; + struct file *pipe; + pid_t oz_pgrp; + int catatonic; + unsigned long exp_timeout; + ino_t next_dir_ino; + struct autofs_wait_queue *queues; /* Wait queue pointer */ + struct autofs_dirhash dirhash; /* Root directory hash */ + struct autofs_symlink symlink[AUTOFS_MAX_SYMLINKS]; + unsigned long symlink_bitmap[AUTOFS_SYMLINK_BITMAP_LEN]; +}; + +static inline struct autofs_sb_info *autofs_sbi(struct super_block *sb) +{ + return (struct autofs_sb_info *)(sb->s_fs_info); +} + +/* autofs_oz_mode(): do we see the man behind the curtain? (The + processes which do manipulations for us in user space sees the raw + filesystem without "magic".) */ + +static inline int autofs_oz_mode(struct autofs_sb_info *sbi) { + return sbi->catatonic || process_group(current) == sbi->oz_pgrp; +} + +/* Hash operations */ + +void autofs_initialize_hash(struct autofs_dirhash *); +struct autofs_dir_ent *autofs_hash_lookup(const struct autofs_dirhash *,struct qstr *); +void autofs_hash_insert(struct autofs_dirhash *,struct autofs_dir_ent *); +void autofs_hash_delete(struct autofs_dir_ent *); +struct autofs_dir_ent *autofs_hash_enum(const struct autofs_dirhash *,off_t *,struct autofs_dir_ent *); +void autofs_hash_dputall(struct autofs_dirhash *); +void autofs_hash_nuke(struct autofs_dirhash *); + +/* Expiration-handling functions */ + +void autofs_update_usage(struct autofs_dirhash *,struct autofs_dir_ent *); +struct autofs_dir_ent *autofs_expire(struct super_block *,struct autofs_sb_info *, struct vfsmount *mnt); + +/* Operations structures */ + +extern struct inode_operations autofs_root_inode_operations; +extern struct inode_operations autofs_symlink_inode_operations; +extern struct file_operations autofs_root_operations; + +/* Initializing function */ + +int autofs_fill_super(struct super_block *, void *, int); + +/* Queue management functions */ + +int autofs_wait(struct autofs_sb_info *,struct qstr *); +int autofs_wait_release(struct autofs_sb_info *,autofs_wqt_t,int); +void autofs_catatonic_mode(struct autofs_sb_info *); + +#ifdef DEBUG +void autofs_say(const char *name, int len); +#else +#define autofs_say(n,l) ((void)0) +#endif |