internal.h 32.4 KB
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/* internal AFS stuff
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 *
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 * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved.
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 * Written by David Howells (dhowells@redhat.com)
 *
 * 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/compiler.h>
#include <linux/kernel.h>
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#include <linux/ktime.h>
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#include <linux/fs.h>
#include <linux/pagemap.h>
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#include <linux/rxrpc.h>
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#include <linux/key.h>
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#include <linux/workqueue.h>
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#include <linux/sched.h>
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#include <linux/fscache.h>
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#include <linux/backing-dev.h>
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#include <linux/uuid.h>
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#include <net/net_namespace.h>
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#include <net/af_rxrpc.h>
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#include "afs.h"
#include "afs_vl.h"

#define AFS_CELL_MAX_ADDRS 15

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struct pagevec;
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struct afs_call;

typedef enum {
	AFS_VL_NEW,			/* new, uninitialised record */
	AFS_VL_CREATING,		/* creating record */
	AFS_VL_VALID,			/* record is pending */
	AFS_VL_NO_VOLUME,		/* no such volume available */
	AFS_VL_UPDATING,		/* update in progress */
	AFS_VL_VOLUME_DELETED,		/* volume was deleted */
	AFS_VL_UNCERTAIN,		/* uncertain state (update failed) */
} __attribute__((packed)) afs_vlocation_state_t;
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struct afs_mount_params {
	bool			rwpath;		/* T if the parent should be considered R/W */
	bool			force;		/* T to force cell type */
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	bool			autocell;	/* T if set auto mount operation */
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	afs_voltype_t		type;		/* type of volume requested */
	int			volnamesz;	/* size of volume name */
	const char		*volname;	/* name of volume to mount */
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	struct afs_net		*net;		/* Network namespace in effect */
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	struct afs_cell		*cell;		/* cell in which to find volume */
	struct afs_volume	*volume;	/* volume record */
	struct key		*key;		/* key to use for secure mounting */
};

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enum afs_call_state {
	AFS_CALL_REQUESTING,	/* request is being sent for outgoing call */
	AFS_CALL_AWAIT_REPLY,	/* awaiting reply to outgoing call */
	AFS_CALL_AWAIT_OP_ID,	/* awaiting op ID on incoming call */
	AFS_CALL_AWAIT_REQUEST,	/* awaiting request data on incoming call */
	AFS_CALL_REPLYING,	/* replying to incoming call */
	AFS_CALL_AWAIT_ACK,	/* awaiting final ACK of incoming call */
	AFS_CALL_COMPLETE,	/* Completed or failed */
};
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/*
 * a record of an in-progress RxRPC call
 */
struct afs_call {
	const struct afs_call_type *type;	/* type of call */
	wait_queue_head_t	waitq;		/* processes awaiting completion */
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	struct work_struct	async_work;	/* async I/O processor */
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	struct work_struct	work;		/* actual work processor */
	struct rxrpc_call	*rxcall;	/* RxRPC call handle */
	struct key		*key;		/* security for this call */
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	struct afs_net		*net;		/* The network namespace */
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	struct afs_server	*server;	/* server affected by incoming CM call */
	void			*request;	/* request data (first part) */
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	struct address_space	*mapping;	/* page set */
	struct afs_writeback	*wb;		/* writeback being performed */
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	void			*buffer;	/* reply receive buffer */
	void			*reply;		/* reply buffer (first part) */
	void			*reply2;	/* reply buffer (second part) */
	void			*reply3;	/* reply buffer (third part) */
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	void			*reply4;	/* reply buffer (fourth part) */
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	pgoff_t			first;		/* first page in mapping to deal with */
	pgoff_t			last;		/* last page in mapping to deal with */
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	size_t			offset;		/* offset into received data store */
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	atomic_t		usage;
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	enum afs_call_state	state;
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	int			error;		/* error code */
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	u32			abort_code;	/* Remote abort ID or 0 */
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	unsigned		request_size;	/* size of request data */
	unsigned		reply_max;	/* maximum size of reply */
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	unsigned		first_offset;	/* offset into mapping[first] */
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	union {
		unsigned	last_to;	/* amount of mapping[last] */
		unsigned	count2;		/* count used in unmarshalling */
	};
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	unsigned char		unmarshall;	/* unmarshalling phase */
	bool			incoming;	/* T if incoming call */
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	bool			send_pages;	/* T if data from mapping should be sent */
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	bool			need_attention;	/* T if RxRPC poked us */
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	bool			async;		/* T if asynchronous */
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	bool			upgrade;	/* T to request service upgrade */
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	u16			service_id;	/* RxRPC service ID to call */
	__be16			port;		/* target UDP port */
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	u32			operation_ID;	/* operation ID for an incoming call */
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	u32			count;		/* count for use in unmarshalling */
	__be32			tmp;		/* place to extract temporary data */
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	afs_dataversion_t	store_version;	/* updated version expected from store */
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};

struct afs_call_type {
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	const char *name;

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	/* deliver request or reply data to an call
	 * - returning an error will cause the call to be aborted
	 */
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	int (*deliver)(struct afs_call *call);
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	/* map an abort code to an error number */
	int (*abort_to_error)(u32 abort_code);

	/* clean up a call */
	void (*destructor)(struct afs_call *call);
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	/* Work function */
	void (*work)(struct work_struct *work);
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};

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/*
 * Record of an outstanding read operation on a vnode.
 */
struct afs_read {
	loff_t			pos;		/* Where to start reading */
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	loff_t			len;		/* How much we're asking for */
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	loff_t			actual_len;	/* How much we're actually getting */
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	loff_t			remain;		/* Amount remaining */
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	atomic_t		usage;
	unsigned int		index;		/* Which page we're reading into */
	unsigned int		nr_pages;
	void (*page_done)(struct afs_call *, struct afs_read *);
	struct page		*pages[];
};

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/*
 * record of an outstanding writeback on a vnode
 */
struct afs_writeback {
	struct list_head	link;		/* link in vnode->writebacks */
	struct work_struct	writer;		/* work item to perform the writeback */
	struct afs_vnode	*vnode;		/* vnode to which this write applies */
	struct key		*key;		/* owner of this write */
	wait_queue_head_t	waitq;		/* completion and ready wait queue */
	pgoff_t			first;		/* first page in batch */
	pgoff_t			point;		/* last page in current store op */
	pgoff_t			last;		/* last page in batch (inclusive) */
	unsigned		offset_first;	/* offset into first page of start of write */
	unsigned		to_last;	/* offset into last page of end of write */
	int			num_conflicts;	/* count of conflicting writes in list */
	int			usage;
	bool			conflicts;	/* T if has dependent conflicts */
	enum {
		AFS_WBACK_SYNCING,		/* synchronisation being performed */
		AFS_WBACK_PENDING,		/* write pending */
		AFS_WBACK_CONFLICTING,		/* conflicting writes posted */
		AFS_WBACK_WRITING,		/* writing back */
		AFS_WBACK_COMPLETE		/* the writeback record has been unlinked */
	} state __attribute__((packed));
};

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/*
 * AFS superblock private data
 * - there's one superblock per volume
 */
struct afs_super_info {
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	struct afs_net		*net;		/* Network namespace */
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	struct afs_volume	*volume;	/* volume record */
	char			rwparent;	/* T if parent is R/W AFS volume */
};
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static inline struct afs_super_info *AFS_FS_S(struct super_block *sb)
{
	return sb->s_fs_info;
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}

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extern struct file_system_type afs_fs_type;

/*
 * entry in the cached cell catalogue
 */
struct afs_cache_cell {
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	char		name[AFS_MAXCELLNAME];	/* cell name (padded with NULs) */
	struct in_addr	vl_servers[15];		/* cached cell VL servers */
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};

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/*
 * AFS network namespace record.
 */
struct afs_net {
	struct afs_uuid		uuid;
	bool			live;		/* F if this namespace is being removed */

	/* AF_RXRPC I/O stuff */
	struct socket		*socket;
	struct afs_call		*spare_incoming_call;
	struct work_struct	charge_preallocation_work;
	struct mutex		socket_mutex;
	atomic_t		nr_outstanding_calls;
	atomic_t		nr_superblocks;

	/* Cell database */
	struct list_head	cells;
	struct afs_cell		*ws_cell;
	rwlock_t		cells_lock;
	struct rw_semaphore	cells_sem;
	wait_queue_head_t	cells_freeable_wq;

	struct rw_semaphore	proc_cells_sem;
	struct list_head	proc_cells;

	/* Volume location database */
	struct list_head	vl_updates;		/* VL records in need-update order */
	struct list_head	vl_graveyard;		/* Inactive VL records */
	struct delayed_work	vl_reaper;
	struct delayed_work	vl_updater;
	spinlock_t		vl_updates_lock;
	spinlock_t		vl_graveyard_lock;

	/* File locking renewal management */
	struct mutex		lock_manager_mutex;

	/* Server database */
	struct rb_root		servers;		/* Active servers */
	rwlock_t		servers_lock;
	struct list_head	server_graveyard;	/* Inactive server LRU list */
	spinlock_t		server_graveyard_lock;
	struct delayed_work	server_reaper;

	/* Misc */
	struct proc_dir_entry	*proc_afs;		/* /proc/net/afs directory */
};

extern struct afs_net __afs_net;// Dummy AFS network namespace; TODO: replace with real netns

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/*
 * AFS cell record
 */
struct afs_cell {
	atomic_t		usage;
	struct list_head	link;		/* main cell list link */
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	struct afs_net		*net;		/* The network namespace */
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	struct key		*anonymous_key;	/* anonymous user key for this cell */
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	struct list_head	proc_link;	/* /proc cell list link */
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#ifdef CONFIG_AFS_FSCACHE
	struct fscache_cookie	*cache;		/* caching cookie */
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#endif

	/* server record management */
	rwlock_t		servers_lock;	/* active server list lock */
	struct list_head	servers;	/* active server list */

	/* volume location record management */
	struct rw_semaphore	vl_sem;		/* volume management serialisation semaphore */
	struct list_head	vl_list;	/* cell's active VL record list */
	spinlock_t		vl_lock;	/* vl_list lock */
	unsigned short		vl_naddrs;	/* number of VL servers in addr list */
	unsigned short		vl_curr_svix;	/* current server index */
	struct in_addr		vl_addrs[AFS_CELL_MAX_ADDRS];	/* cell VL server addresses */

	char			name[0];	/* cell name - must go last */
};

/*
 * entry in the cached volume location catalogue
 */
struct afs_cache_vlocation {
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	/* volume name (lowercase, padded with NULs) */
	uint8_t			name[AFS_MAXVOLNAME + 1];

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	uint8_t			nservers;	/* number of entries used in servers[] */
	uint8_t			vidmask;	/* voltype mask for vid[] */
	uint8_t			srvtmask[8];	/* voltype masks for servers[] */
#define AFS_VOL_VTM_RW	0x01 /* R/W version of the volume is available (on this server) */
#define AFS_VOL_VTM_RO	0x02 /* R/O version of the volume is available (on this server) */
#define AFS_VOL_VTM_BAK	0x04 /* backup version of the volume is available (on this server) */

	afs_volid_t		vid[3];		/* volume IDs for R/W, R/O and Bak volumes */
	struct in_addr		servers[8];	/* fileserver addresses */
	time_t			rtime;		/* last retrieval time */
};

/*
 * volume -> vnode hash table entry
 */
struct afs_cache_vhash {
	afs_voltype_t		vtype;		/* which volume variation */
	uint8_t			hash_bucket;	/* which hash bucket this represents */
} __attribute__((packed));

/*
 * AFS volume location record
 */
struct afs_vlocation {
	atomic_t		usage;
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	time64_t		time_of_death;	/* time at which put reduced usage to 0 */
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	struct list_head	link;		/* link in cell volume location list */
	struct list_head	grave;		/* link in master graveyard list */
	struct list_head	update;		/* link in master update list */
	struct afs_cell		*cell;		/* cell to which volume belongs */
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#ifdef CONFIG_AFS_FSCACHE
	struct fscache_cookie	*cache;		/* caching cookie */
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#endif
	struct afs_cache_vlocation vldb;	/* volume information DB record */
	struct afs_volume	*vols[3];	/* volume access record pointer (index by type) */
	wait_queue_head_t	waitq;		/* status change waitqueue */
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	time64_t		update_at;	/* time at which record should be updated */
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	spinlock_t		lock;		/* access lock */
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	afs_vlocation_state_t	state;		/* volume location state */
	unsigned short		upd_rej_cnt;	/* ENOMEDIUM count during update */
	unsigned short		upd_busy_cnt;	/* EBUSY count during update */
	bool			valid;		/* T if valid */
};

/*
 * AFS fileserver record
 */
struct afs_server {
	atomic_t		usage;
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	time64_t		time_of_death;	/* time at which put reduced usage to 0 */
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	struct in_addr		addr;		/* server address */
	struct afs_cell		*cell;		/* cell in which server resides */
	struct list_head	link;		/* link in cell's server list */
	struct list_head	grave;		/* link in master graveyard list */
	struct rb_node		master_rb;	/* link in master by-addr tree */
	struct rw_semaphore	sem;		/* access lock */

	/* file service access */
	struct rb_root		fs_vnodes;	/* vnodes backed by this server (ordered by FID) */
	unsigned long		fs_act_jif;	/* time at which last activity occurred */
	unsigned long		fs_dead_jif;	/* time at which no longer to be considered dead */
	spinlock_t		fs_lock;	/* access lock */
	int			fs_state;      	/* 0 or reason FS currently marked dead (-errno) */

	/* callback promise management */
	struct rb_root		cb_promises;	/* vnode expiration list (ordered earliest first) */
	struct delayed_work	cb_updater;	/* callback updater */
	struct delayed_work	cb_break_work;	/* collected break dispatcher */
	wait_queue_head_t	cb_break_waitq;	/* space available in cb_break waitqueue */
	spinlock_t		cb_lock;	/* access lock */
	struct afs_callback	cb_break[64];	/* ring of callbacks awaiting breaking */
	atomic_t		cb_break_n;	/* number of pending breaks */
	u8			cb_break_head;	/* head of callback breaking ring */
	u8			cb_break_tail;	/* tail of callback breaking ring */
};

/*
 * AFS volume access record
 */
struct afs_volume {
	atomic_t		usage;
	struct afs_cell		*cell;		/* cell to which belongs (unrefd ptr) */
	struct afs_vlocation	*vlocation;	/* volume location */
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#ifdef CONFIG_AFS_FSCACHE
	struct fscache_cookie	*cache;		/* caching cookie */
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#endif
	afs_volid_t		vid;		/* volume ID */
	afs_voltype_t		type;		/* type of volume */
	char			type_force;	/* force volume type (suppress R/O -> R/W) */
	unsigned short		nservers;	/* number of server slots filled */
	unsigned short		rjservers;	/* number of servers discarded due to -ENOMEDIUM */
	struct afs_server	*servers[8];	/* servers on which volume resides (ordered) */
	struct rw_semaphore	server_sem;	/* lock for accessing current server */
};

/*
 * vnode catalogue entry
 */
struct afs_cache_vnode {
	afs_vnodeid_t		vnode_id;	/* vnode ID */
	unsigned		vnode_unique;	/* vnode ID uniquifier */
	afs_dataversion_t	data_version;	/* data version */
};

/*
 * AFS inode private data
 */
struct afs_vnode {
	struct inode		vfs_inode;	/* the VFS's inode record */

	struct afs_volume	*volume;	/* volume on which vnode resides */
	struct afs_server	*server;	/* server currently supplying this file */
	struct afs_fid		fid;		/* the file identifier for this inode */
	struct afs_file_status	status;		/* AFS status info for this file */
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#ifdef CONFIG_AFS_FSCACHE
	struct fscache_cookie	*cache;		/* caching cookie */
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#endif
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	struct afs_permits	*permits;	/* cache of permits so far obtained */
	struct mutex		permits_lock;	/* lock for altering permits list */
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	struct mutex		validate_lock;	/* lock for validating this vnode */
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	wait_queue_head_t	update_waitq;	/* status fetch waitqueue */
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	int			update_cnt;	/* number of outstanding ops that will update the
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						 * status */
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	spinlock_t		writeback_lock;	/* lock for writebacks */
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	spinlock_t		lock;		/* waitqueue/flags lock */
	unsigned long		flags;
#define AFS_VNODE_CB_BROKEN	0		/* set if vnode's callback was broken */
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#define AFS_VNODE_UNSET		1		/* set if vnode attributes not yet set */
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#define AFS_VNODE_MODIFIED	2		/* set if vnode's data modified */
#define AFS_VNODE_ZAP_DATA	3		/* set if vnode's data should be invalidated */
#define AFS_VNODE_DELETED	4		/* set if vnode deleted on server */
#define AFS_VNODE_MOUNTPOINT	5		/* set if vnode is a mountpoint symlink */
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#define AFS_VNODE_LOCKING	6		/* set if waiting for lock on vnode */
#define AFS_VNODE_READLOCKED	7		/* set if vnode is read-locked on the server */
#define AFS_VNODE_WRITELOCKED	8		/* set if vnode is write-locked on the server */
#define AFS_VNODE_UNLOCKING	9		/* set if vnode is being unlocked on the server */
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#define AFS_VNODE_AUTOCELL	10		/* set if Vnode is an auto mount point */
#define AFS_VNODE_PSEUDODIR	11		/* set if Vnode is a pseudo directory */
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	long			acl_order;	/* ACL check count (callback break count) */

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	struct list_head	writebacks;	/* alterations in pagecache that need writing */
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	struct list_head	pending_locks;	/* locks waiting to be granted */
	struct list_head	granted_locks;	/* locks granted on this file */
	struct delayed_work	lock_work;	/* work to be done in locking */
	struct key		*unlock_key;	/* key to be used in unlocking */
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	/* outstanding callback notification on this file */
	struct rb_node		server_rb;	/* link in server->fs_vnodes */
	struct rb_node		cb_promise;	/* link in server->cb_promises */
	struct work_struct	cb_broken_work;	/* work to be done on callback break */
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	time64_t		cb_expires;	/* time at which callback expires */
	time64_t		cb_expires_at;	/* time used to order cb_promise */
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	unsigned		cb_version;	/* callback version */
	unsigned		cb_expiry;	/* callback expiry time */
	afs_callback_type_t	cb_type;	/* type of callback */
	bool			cb_promised;	/* true if promise still holds */
};

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/*
 * cached security record for one user's attempt to access a vnode
 */
struct afs_permit {
	struct key		*key;		/* RxRPC ticket holding a security context */
	afs_access_t		access_mask;	/* access mask for this key */
};

/*
 * cache of security records from attempts to access a vnode
 */
struct afs_permits {
	struct rcu_head		rcu;		/* disposal procedure */
	int			count;		/* number of records */
	struct afs_permit	permits[0];	/* the permits so far examined */
};

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/*
 * record of one of a system's set of network interfaces
 */
struct afs_interface {
	struct in_addr	address;	/* IPv4 address bound to interface */
	struct in_addr	netmask;	/* netmask applied to address */
	unsigned	mtu;		/* MTU of interface */
};

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/*****************************************************************************/
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/*
 * cache.c
 */
#ifdef CONFIG_AFS_FSCACHE
extern struct fscache_netfs afs_cache_netfs;
extern struct fscache_cookie_def afs_cell_cache_index_def;
extern struct fscache_cookie_def afs_vlocation_cache_index_def;
extern struct fscache_cookie_def afs_volume_cache_index_def;
extern struct fscache_cookie_def afs_vnode_cache_index_def;
#else
#define afs_cell_cache_index_def	(*(struct fscache_cookie_def *) NULL)
#define afs_vlocation_cache_index_def	(*(struct fscache_cookie_def *) NULL)
#define afs_volume_cache_index_def	(*(struct fscache_cookie_def *) NULL)
#define afs_vnode_cache_index_def	(*(struct fscache_cookie_def *) NULL)
#endif

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/*
 * callback.c
 */
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extern struct workqueue_struct *afs_callback_update_worker;

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extern void afs_init_callback_state(struct afs_server *);
extern void afs_broken_callback_work(struct work_struct *);
extern void afs_break_callbacks(struct afs_server *, size_t,
				struct afs_callback[]);
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extern void afs_discard_callback_on_delete(struct afs_vnode *);
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extern void afs_give_up_callback(struct afs_vnode *);
extern void afs_dispatch_give_up_callbacks(struct work_struct *);
extern void afs_flush_callback_breaks(struct afs_server *);

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/*
 * cell.c
 */
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#define afs_get_cell(C) do { atomic_inc(&(C)->usage); } while(0)
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extern int afs_cell_init(struct afs_net *, char *);
extern struct afs_cell *afs_cell_create(struct afs_net *, const char *, unsigned, char *, bool);
extern struct afs_cell *afs_cell_lookup(struct afs_net *, const char *, unsigned, bool);
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extern struct afs_cell *afs_grab_cell(struct afs_cell *);
extern void afs_put_cell(struct afs_cell *);
509
extern void __net_exit afs_cell_purge(struct afs_net *);
510 511 512 513 514 515

/*
 * cmservice.c
 */
extern bool afs_cm_incoming_call(struct afs_call *);

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/*
 * dir.c
 */
519
extern const struct inode_operations afs_dir_inode_operations;
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extern const struct dentry_operations afs_fs_dentry_operations;
521
extern const struct file_operations afs_dir_file_operations;
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/*
 * file.c
 */
526
extern const struct address_space_operations afs_fs_aops;
527
extern const struct inode_operations afs_file_inode_operations;
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extern const struct file_operations afs_file_operations;

extern int afs_open(struct inode *, struct file *);
extern int afs_release(struct inode *, struct file *);
532
extern int afs_page_filler(void *, struct page *);
533
extern void afs_put_read(struct afs_read *);
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/*
 * flock.c
 */
538 539
extern struct workqueue_struct *afs_lock_manager;

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extern void afs_lock_work(struct work_struct *);
extern void afs_lock_may_be_available(struct afs_vnode *);
extern int afs_lock(struct file *, int, struct file_lock *);
extern int afs_flock(struct file *, int, struct file_lock *);

545 546 547
/*
 * fsclient.c
 */
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extern int afs_fs_fetch_file_status(struct afs_server *, struct key *,
				    struct afs_vnode *, struct afs_volsync *,
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				    bool);
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extern int afs_fs_give_up_callbacks(struct afs_net *, struct afs_server *, bool);
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extern int afs_fs_fetch_data(struct afs_server *, struct key *,
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			     struct afs_vnode *, struct afs_read *, bool);
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extern int afs_fs_create(struct afs_server *, struct key *,
			 struct afs_vnode *, const char *, umode_t,
			 struct afs_fid *, struct afs_file_status *,
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			 struct afs_callback *, bool);
558
extern int afs_fs_remove(struct afs_server *, struct key *,
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			 struct afs_vnode *, const char *, bool, bool);
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extern int afs_fs_link(struct afs_server *, struct key *, struct afs_vnode *,
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		       struct afs_vnode *, const char *, bool);
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extern int afs_fs_symlink(struct afs_server *, struct key *,
			  struct afs_vnode *, const char *, const char *,
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			  struct afs_fid *, struct afs_file_status *, bool);
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extern int afs_fs_rename(struct afs_server *, struct key *,
			 struct afs_vnode *, const char *,
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			 struct afs_vnode *, const char *, bool);
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extern int afs_fs_store_data(struct afs_server *, struct afs_writeback *,
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			     pgoff_t, pgoff_t, unsigned, unsigned, bool);
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extern int afs_fs_setattr(struct afs_server *, struct key *,
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			  struct afs_vnode *, struct iattr *, bool);
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extern int afs_fs_get_volume_status(struct afs_server *, struct key *,
				    struct afs_vnode *,
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				    struct afs_volume_status *, bool);
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extern int afs_fs_set_lock(struct afs_server *, struct key *,
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			   struct afs_vnode *, afs_lock_type_t, bool);
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extern int afs_fs_extend_lock(struct afs_server *, struct key *,
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			      struct afs_vnode *, bool);
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extern int afs_fs_release_lock(struct afs_server *, struct key *,
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			       struct afs_vnode *, bool);
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/*
 * inode.c
 */
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extern struct inode *afs_iget_autocell(struct inode *, const char *, int,
				       struct key *);
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extern struct inode *afs_iget(struct super_block *, struct key *,
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			      struct afs_fid *, struct afs_file_status *,
			      struct afs_callback *);
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extern void afs_zap_data(struct afs_vnode *);
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extern int afs_validate(struct afs_vnode *, struct key *);
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extern int afs_getattr(const struct path *, struct kstat *, u32, unsigned int);
593
extern int afs_setattr(struct dentry *, struct iattr *);
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extern void afs_evict_inode(struct inode *);
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extern int afs_drop_inode(struct inode *);
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/*
 * main.c
 */
600
extern struct workqueue_struct *afs_wq;
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static inline struct afs_net *afs_d2net(struct dentry *dentry)
{
	return &__afs_net;
}

static inline struct afs_net *afs_i2net(struct inode *inode)
{
	return &__afs_net;
}

static inline struct afs_net *afs_v2net(struct afs_vnode *vnode)
{
	return &__afs_net;
}

static inline struct afs_net *afs_sock2net(struct sock *sk)
{
	return &__afs_net;
}

static inline struct afs_net *afs_get_net(struct afs_net *net)
{
	return net;
}

static inline void afs_put_net(struct afs_net *net)
{
}
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/*
 * misc.c
 */
extern int afs_abort_to_error(u32);

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/*
 * mntpt.c
 */
639
extern const struct inode_operations afs_mntpt_inode_operations;
640
extern const struct inode_operations afs_autocell_inode_operations;
641
extern const struct file_operations afs_mntpt_file_operations;
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extern struct vfsmount *afs_d_automount(struct path *);
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extern void afs_mntpt_kill_timer(void);
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/*
 * netdevices.c
 */
extern int afs_get_ipv4_interfaces(struct afs_interface *, size_t, bool);

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/*
 * proc.c
 */
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extern int __net_init afs_proc_init(struct afs_net *);
extern void __net_exit afs_proc_cleanup(struct afs_net *);
extern int afs_proc_cell_setup(struct afs_net *, struct afs_cell *);
extern void afs_proc_cell_remove(struct afs_net *, struct afs_cell *);
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659 660 661
/*
 * rxrpc.c
 */
662
extern struct workqueue_struct *afs_async_calls;
663

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extern int __net_init afs_open_socket(struct afs_net *);
extern void __net_exit afs_close_socket(struct afs_net *);
extern void afs_charge_preallocation(struct work_struct *);
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extern void afs_put_call(struct afs_call *);
extern int afs_queue_call_work(struct afs_call *);
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extern int afs_make_call(struct in_addr *, struct afs_call *, gfp_t, bool);
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extern struct afs_call *afs_alloc_flat_call(struct afs_net *,
					    const struct afs_call_type *,
672 673 674
					    size_t, size_t);
extern void afs_flat_call_destructor(struct afs_call *);
extern void afs_send_empty_reply(struct afs_call *);
675
extern void afs_send_simple_reply(struct afs_call *, const void *, size_t);
676
extern int afs_extract_data(struct afs_call *, void *, size_t, bool);
677

678
static inline int afs_transfer_reply(struct afs_call *call)
679
{
680
	return afs_extract_data(call, call->buffer, call->reply_max, false);
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}

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/*
 * security.c
 */
extern void afs_clear_permits(struct afs_vnode *);
extern void afs_cache_permit(struct afs_vnode *, struct key *, long);
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extern void afs_zap_permits(struct rcu_head *);
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extern struct key *afs_request_key(struct afs_cell *);
690
extern int afs_permission(struct inode *, int);
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/*
 * server.c
 */
extern spinlock_t afs_server_peer_lock;

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#define afs_get_server(S)					\
do {								\
	_debug("GET SERVER %d", atomic_read(&(S)->usage));	\
	atomic_inc(&(S)->usage);				\
} while(0)
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extern struct afs_server *afs_lookup_server(struct afs_cell *,
					    const struct in_addr *);
705 706
extern struct afs_server *afs_find_server(struct afs_net *,
					  const struct sockaddr_rxrpc *);
707
extern void afs_put_server(struct afs_server *);
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extern void afs_reap_server(struct work_struct *);
extern void __net_exit afs_purge_servers(struct afs_net *);
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/*
 * super.c
 */
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extern int __init afs_fs_init(void);
extern void __exit afs_fs_exit(void);
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/*
 * vlclient.c
 */
720 721
extern int afs_vl_get_entry_by_name(struct afs_net *,
				    struct in_addr *, struct key *,
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				    const char *, struct afs_cache_vlocation *,
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				    bool);
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extern int afs_vl_get_entry_by_id(struct afs_net *,
				  struct in_addr *, struct key *,
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				  afs_volid_t, afs_voltype_t,
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				  struct afs_cache_vlocation *, bool);
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/*
 * vlocation.c
 */
732 733
extern struct workqueue_struct *afs_vlocation_update_worker;

734 735
#define afs_get_vlocation(V) do { atomic_inc(&(V)->usage); } while(0)

736 737
extern struct afs_vlocation *afs_vlocation_lookup(struct afs_net *,
						  struct afs_cell *,
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						  struct key *,
739
						  const char *, size_t);
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extern void afs_put_vlocation(struct afs_net *, struct afs_vlocation *);
extern void afs_vlocation_updater(struct work_struct *);
extern void afs_vlocation_reaper(struct work_struct *);
extern void __net_exit afs_vlocation_purge(struct afs_net *);
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/*
 * vnode.c
 */
static inline struct afs_vnode *AFS_FS_I(struct inode *inode)
{
	return container_of(inode, struct afs_vnode, vfs_inode);
}

static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode)
{
	return &vnode->vfs_inode;
}

758 759
extern void afs_vnode_finalise_status_update(struct afs_vnode *,
					     struct afs_server *);
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extern int afs_vnode_fetch_status(struct afs_vnode *, struct afs_vnode *,
				  struct key *);
extern int afs_vnode_fetch_data(struct afs_vnode *, struct key *,
763
				struct afs_read *);
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extern int afs_vnode_create(struct afs_vnode *, struct key *, const char *,
			    umode_t, struct afs_fid *, struct afs_file_status *,
			    struct afs_callback *, struct afs_server **);
extern int afs_vnode_remove(struct afs_vnode *, struct key *, const char *,
			    bool);
extern int afs_vnode_link(struct afs_vnode *, struct afs_vnode *, struct key *,
			  const char *);
extern int afs_vnode_symlink(struct afs_vnode *, struct key *, const char *,
			     const char *, struct afs_fid *,
			     struct afs_file_status *, struct afs_server **);
extern int afs_vnode_rename(struct afs_vnode *, struct afs_vnode *,
			    struct key *, const char *, const char *);
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extern int afs_vnode_store_data(struct afs_writeback *, pgoff_t, pgoff_t,
				unsigned, unsigned);
extern int afs_vnode_setattr(struct afs_vnode *, struct key *, struct iattr *);
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extern int afs_vnode_get_volume_status(struct afs_vnode *, struct key *,
				       struct afs_volume_status *);
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extern int afs_vnode_set_lock(struct afs_vnode *, struct key *,
			      afs_lock_type_t);
extern int afs_vnode_extend_lock(struct afs_vnode *, struct key *);
extern int afs_vnode_release_lock(struct afs_vnode *, struct key *);
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/*
 * volume.c
 */
#define afs_get_volume(V) do { atomic_inc(&(V)->usage); } while(0)

791
extern void afs_put_volume(struct afs_net *, struct afs_volume *);
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extern struct afs_volume *afs_volume_lookup(struct afs_mount_params *);
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extern struct afs_server *afs_volume_pick_fileserver(struct afs_vnode *);
extern int afs_volume_release_fileserver(struct afs_vnode *,
					 struct afs_server *, int);

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/*
 * write.c
 */
extern int afs_set_page_dirty(struct page *);
extern void afs_put_writeback(struct afs_writeback *);
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extern int afs_write_begin(struct file *file, struct address_space *mapping,
			loff_t pos, unsigned len, unsigned flags,
			struct page **pagep, void **fsdata);
extern int afs_write_end(struct file *file, struct address_space *mapping,
			loff_t pos, unsigned len, unsigned copied,
			struct page *page, void *fsdata);
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extern int afs_writepage(struct page *, struct writeback_control *);
extern int afs_writepages(struct address_space *, struct writeback_control *);
extern void afs_pages_written_back(struct afs_vnode *, struct afs_call *);
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extern ssize_t afs_file_write(struct kiocb *, struct iov_iter *);
812
extern int afs_writeback_all(struct afs_vnode *);
813
extern int afs_flush(struct file *, fl_owner_t);
814
extern int afs_fsync(struct file *, loff_t, loff_t, int);
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/*
 * xattr.c
 */
extern const struct xattr_handler *afs_xattr_handlers[];
extern ssize_t afs_listxattr(struct dentry *, char *, size_t);
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/*****************************************************************************/
/*
 * debug tracing
 */
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#include <trace/events/afs.h>

828 829 830
extern unsigned afs_debug;

#define dbgprintk(FMT,...) \
831
	printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
832

833 834
#define kenter(FMT,...)	dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
#define kleave(FMT,...)	dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866
#define kdebug(FMT,...)	dbgprintk("    "FMT ,##__VA_ARGS__)


#if defined(__KDEBUG)
#define _enter(FMT,...)	kenter(FMT,##__VA_ARGS__)
#define _leave(FMT,...)	kleave(FMT,##__VA_ARGS__)
#define _debug(FMT,...)	kdebug(FMT,##__VA_ARGS__)

#elif defined(CONFIG_AFS_DEBUG)
#define AFS_DEBUG_KENTER	0x01
#define AFS_DEBUG_KLEAVE	0x02
#define AFS_DEBUG_KDEBUG	0x04

#define _enter(FMT,...)					\
do {							\
	if (unlikely(afs_debug & AFS_DEBUG_KENTER))	\
		kenter(FMT,##__VA_ARGS__);		\
} while (0)

#define _leave(FMT,...)					\
do {							\
	if (unlikely(afs_debug & AFS_DEBUG_KLEAVE))	\
		kleave(FMT,##__VA_ARGS__);		\
} while (0)

#define _debug(FMT,...)					\
do {							\
	if (unlikely(afs_debug & AFS_DEBUG_KDEBUG))	\
		kdebug(FMT,##__VA_ARGS__);		\
} while (0)

#else
867 868 869
#define _enter(FMT,...)	no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
#define _leave(FMT,...)	no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
#define _debug(FMT,...)	no_printk("    "FMT ,##__VA_ARGS__)
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#endif

/*
 * debug assertion checking
 */
#if 1 // defined(__KDEBUGALL)

#define ASSERT(X)						\
do {								\
	if (unlikely(!(X))) {					\
		printk(KERN_ERR "\n");				\
		printk(KERN_ERR "AFS: Assertion failed\n");	\
		BUG();						\
	}							\
} while(0)

#define ASSERTCMP(X, OP, Y)						\
do {									\
	if (unlikely(!((X) OP (Y)))) {					\
		printk(KERN_ERR "\n");					\
		printk(KERN_ERR "AFS: Assertion failed\n");		\
		printk(KERN_ERR "%lu " #OP " %lu is false\n",		\
		       (unsigned long)(X), (unsigned long)(Y));		\
		printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n",	\
		       (unsigned long)(X), (unsigned long)(Y));		\
		BUG();							\
	}								\
} while(0)

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#define ASSERTRANGE(L, OP1, N, OP2, H)					\
do {									\
	if (unlikely(!((L) OP1 (N)) || !((N) OP2 (H)))) {		\
		printk(KERN_ERR "\n");					\
		printk(KERN_ERR "AFS: Assertion failed\n");		\
		printk(KERN_ERR "%lu "#OP1" %lu "#OP2" %lu is false\n",	\
		       (unsigned long)(L), (unsigned long)(N),		\
		       (unsigned long)(H));				\
		printk(KERN_ERR "0x%lx "#OP1" 0x%lx "#OP2" 0x%lx is false\n", \
		       (unsigned long)(L), (unsigned long)(N),		\
		       (unsigned long)(H));				\
		BUG();							\
	}								\
} while(0)

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#define ASSERTIF(C, X)						\
do {								\
	if (unlikely((C) && !(X))) {				\
		printk(KERN_ERR "\n");				\
		printk(KERN_ERR "AFS: Assertion failed\n");	\
		BUG();						\
	}							\
} while(0)

#define ASSERTIFCMP(C, X, OP, Y)					\
do {									\
	if (unlikely((C) && !((X) OP (Y)))) {				\
		printk(KERN_ERR "\n");					\
		printk(KERN_ERR "AFS: Assertion failed\n");		\
		printk(KERN_ERR "%lu " #OP " %lu is false\n",		\
		       (unsigned long)(X), (unsigned long)(Y));		\
		printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n",	\
		       (unsigned long)(X), (unsigned long)(Y));		\
		BUG();							\
	}								\
} while(0)

#else

#define ASSERT(X)				\
do {						\
} while(0)

#define ASSERTCMP(X, OP, Y)			\
do {						\
} while(0)

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#define ASSERTRANGE(L, OP1, N, OP2, H)		\
do {						\
} while(0)

950 951 952 953 954 955 956 957 958
#define ASSERTIF(C, X)				\
do {						\
} while(0)

#define ASSERTIFCMP(C, X, OP, Y)		\
do {						\
} while(0)

#endif /* __KDEBUGALL */