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linux/fs/afs/internal.h
David Howells b6cfbecafb afs: Handle CONFIG_PROC_FS=n 
The AFS filesystem depends at the moment on /proc for configuration and
also presents information that way - however, this causes a compilation
failure if procfs is disabled.

Fix it so that the procfs bits aren't compiled in if procfs is disabled.

This means that you can't configure the AFS filesystem directly, but it is
still usable provided that an up-to-date keyutils is installed to look up
cells by SRV or AFSDB DNS records.

Reported-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: David Howells <dhowells@redhat.com>
2018-06-15 00:52:55 -04:00

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/* internal AFS stuff
*
* Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved.
* 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>
#include <linux/ktime.h>
#include <linux/fs.h>
#include <linux/pagemap.h>
#include <linux/rxrpc.h>
#include <linux/key.h>
#include <linux/workqueue.h>
#include <linux/sched.h>
#include <linux/fscache.h>
#include <linux/backing-dev.h>
#include <linux/uuid.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>
#include <net/sock.h>
#include <net/af_rxrpc.h>
#include "afs.h"
#include "afs_vl.h"
#define AFS_CELL_MAX_ADDRS 15
struct pagevec;
struct afs_call;
struct afs_mount_params {
bool rwpath; /* T if the parent should be considered R/W */
bool force; /* T to force cell type */
bool autocell; /* T if set auto mount operation */
bool dyn_root; /* T if dynamic root */
afs_voltype_t type; /* type of volume requested */
int volnamesz; /* size of volume name */
const char *volname; /* name of volume to mount */
struct net *net_ns; /* Network namespace in effect */
struct afs_net *net; /* the AFS net namespace stuff */
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 */
};
struct afs_iget_data {
struct afs_fid fid;
struct afs_volume *volume; /* volume on which resides */
};
enum afs_call_state {
AFS_CALL_CL_REQUESTING, /* Client: Request is being sent */
AFS_CALL_CL_AWAIT_REPLY, /* Client: Awaiting reply */
AFS_CALL_CL_PROC_REPLY, /* Client: rxrpc call complete; processing reply */
AFS_CALL_SV_AWAIT_OP_ID, /* Server: Awaiting op ID */
AFS_CALL_SV_AWAIT_REQUEST, /* Server: Awaiting request data */
AFS_CALL_SV_REPLYING, /* Server: Replying */
AFS_CALL_SV_AWAIT_ACK, /* Server: Awaiting final ACK */
AFS_CALL_COMPLETE, /* Completed or failed */
};
/*
* List of server addresses.
*/
struct afs_addr_list {
struct rcu_head rcu; /* Must be first */
refcount_t usage;
u32 version; /* Version */
unsigned short nr_addrs;
unsigned short index; /* Address currently in use */
unsigned short nr_ipv4; /* Number of IPv4 addresses */
unsigned long probed; /* Mask of servers that have been probed */
unsigned long yfs; /* Mask of servers that are YFS */
struct sockaddr_rxrpc addrs[];
};
/*
* 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 */
struct work_struct async_work; /* async I/O processor */
struct work_struct work; /* actual work processor */
struct rxrpc_call *rxcall; /* RxRPC call handle */
struct key *key; /* security for this call */
struct afs_net *net; /* The network namespace */
struct afs_server *cm_server; /* Server affected by incoming CM call */
struct afs_cb_interest *cbi; /* Callback interest for server used */
void *request; /* request data (first part) */
struct address_space *mapping; /* Pages being written from */
void *buffer; /* reply receive buffer */
void *reply[4]; /* Where to put the reply */
pgoff_t first; /* first page in mapping to deal with */
pgoff_t last; /* last page in mapping to deal with */
size_t offset; /* offset into received data store */
atomic_t usage;
enum afs_call_state state;
spinlock_t state_lock;
int error; /* error code */
u32 abort_code; /* Remote abort ID or 0 */
unsigned request_size; /* size of request data */
unsigned reply_max; /* maximum size of reply */
unsigned first_offset; /* offset into mapping[first] */
unsigned int cb_break; /* cb_break + cb_s_break before the call */
union {
unsigned last_to; /* amount of mapping[last] */
unsigned count2; /* count used in unmarshalling */
};
unsigned char unmarshall; /* unmarshalling phase */
bool incoming; /* T if incoming call */
bool send_pages; /* T if data from mapping should be sent */
bool need_attention; /* T if RxRPC poked us */
bool async; /* T if asynchronous */
bool ret_reply0; /* T if should return reply[0] on success */
bool upgrade; /* T to request service upgrade */
u16 service_id; /* Actual service ID (after upgrade) */
unsigned int debug_id; /* Trace ID */
u32 operation_ID; /* operation ID for an incoming call */
u32 count; /* count for use in unmarshalling */
__be32 tmp; /* place to extract temporary data */
afs_dataversion_t expected_version; /* Updated version expected from store */
afs_dataversion_t expected_version_2; /* 2nd updated version expected from store */
};
struct afs_call_type {
const char *name;
unsigned int op; /* Really enum afs_fs_operation */
/* deliver request or reply data to an call
* - returning an error will cause the call to be aborted
*/
int (*deliver)(struct afs_call *call);
/* clean up a call */
void (*destructor)(struct afs_call *call);
/* Work function */
void (*work)(struct work_struct *work);
};
/*
* Key available for writeback on a file.
*/
struct afs_wb_key {
refcount_t usage;
struct key *key;
struct list_head vnode_link; /* Link in vnode->wb_keys */
};
/*
* AFS open file information record. Pointed to by file->private_data.
*/
struct afs_file {
struct key *key; /* The key this file was opened with */
struct afs_wb_key *wb; /* Writeback key record for this file */
};
static inline struct key *afs_file_key(struct file *file)
{
struct afs_file *af = file->private_data;
return af->key;
}
/*
* Record of an outstanding read operation on a vnode.
*/
struct afs_read {
loff_t pos; /* Where to start reading */
loff_t len; /* How much we're asking for */
loff_t actual_len; /* How much we're actually getting */
loff_t remain; /* Amount remaining */
loff_t file_size; /* File size returned by server */
afs_dataversion_t data_version; /* Version number returned by server */
refcount_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;
struct page *array[];
};
/*
* AFS superblock private data
* - there's one superblock per volume
*/
struct afs_super_info {
struct net *net_ns; /* Network namespace */
struct afs_cell *cell; /* The cell in which the volume resides */
struct afs_volume *volume; /* volume record */
bool dyn_root; /* True if dynamic root */
};
static inline struct afs_super_info *AFS_FS_S(struct super_block *sb)
{
return sb->s_fs_info;
}
extern struct file_system_type afs_fs_type;
/*
* Set of substitutes for @sys.
*/
struct afs_sysnames {
#define AFS_NR_SYSNAME 16
char *subs[AFS_NR_SYSNAME];
refcount_t usage;
unsigned short nr;
char blank[1];
};
/*
* AFS network namespace record.
*/
struct afs_net {
struct net *net; /* Backpointer to the owning net namespace */
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 rb_root cells;
struct afs_cell __rcu *ws_cell;
struct work_struct cells_manager;
struct timer_list cells_timer;
atomic_t cells_outstanding;
seqlock_t cells_lock;
spinlock_t proc_cells_lock;
struct list_head proc_cells;
/* Known servers. Theoretically each fileserver can only be in one
* cell, but in practice, people create aliases and subsets and there's
* no easy way to distinguish them.
*/
seqlock_t fs_lock; /* For fs_servers */
struct rb_root fs_servers; /* afs_server (by server UUID or address) */
struct list_head fs_updates; /* afs_server (by update_at) */
struct hlist_head fs_proc; /* procfs servers list */
struct hlist_head fs_addresses4; /* afs_server (by lowest IPv4 addr) */
struct hlist_head fs_addresses6; /* afs_server (by lowest IPv6 addr) */
seqlock_t fs_addr_lock; /* For fs_addresses[46] */
struct work_struct fs_manager;
struct timer_list fs_timer;
atomic_t servers_outstanding;
/* File locking renewal management */
struct mutex lock_manager_mutex;
/* Misc */
struct proc_dir_entry *proc_afs; /* /proc/net/afs directory */
struct afs_sysnames *sysnames;
rwlock_t sysnames_lock;
/* Statistics counters */
atomic_t n_lookup; /* Number of lookups done */
atomic_t n_reval; /* Number of dentries needing revalidation */
atomic_t n_inval; /* Number of invalidations by the server */
atomic_t n_relpg; /* Number of invalidations by releasepage */
atomic_t n_read_dir; /* Number of directory pages read */
atomic_t n_dir_cr; /* Number of directory entry creation edits */
atomic_t n_dir_rm; /* Number of directory entry removal edits */
atomic_t n_stores; /* Number of store ops */
atomic_long_t n_store_bytes; /* Number of bytes stored */
atomic_long_t n_fetch_bytes; /* Number of bytes fetched */
atomic_t n_fetches; /* Number of data fetch ops */
};
extern const char afs_init_sysname[];
enum afs_cell_state {
AFS_CELL_UNSET,
AFS_CELL_ACTIVATING,
AFS_CELL_ACTIVE,
AFS_CELL_DEACTIVATING,
AFS_CELL_INACTIVE,
AFS_CELL_FAILED,
};
/*
* AFS cell record.
*
* This is a tricky concept to get right as it is possible to create aliases
* simply by pointing AFSDB/SRV records for two names at the same set of VL
* servers; it is also possible to do things like setting up two sets of VL
* servers, one of which provides a superset of the volumes provided by the
* other (for internal/external division, for example).
*
* Cells only exist in the sense that (a) a cell's name maps to a set of VL
* servers and (b) a cell's name is used by the client to select the key to use
* for authentication and encryption. The cell name is not typically used in
* the protocol.
*
* There is no easy way to determine if two cells are aliases or one is a
* subset of another.
*/
struct afs_cell {
union {
struct rcu_head rcu;
struct rb_node net_node; /* Node in net->cells */
};
struct afs_net *net;
struct key *anonymous_key; /* anonymous user key for this cell */
struct work_struct manager; /* Manager for init/deinit/dns */
struct list_head proc_link; /* /proc cell list link */
#ifdef CONFIG_AFS_FSCACHE
struct fscache_cookie *cache; /* caching cookie */
#endif
time64_t dns_expiry; /* Time AFSDB/SRV record expires */
time64_t last_inactive; /* Time of last drop of usage count */
atomic_t usage;
unsigned long flags;
#define AFS_CELL_FL_NOT_READY 0 /* The cell record is not ready for use */
#define AFS_CELL_FL_NO_GC 1 /* The cell was added manually, don't auto-gc */
#define AFS_CELL_FL_NOT_FOUND 2 /* Permanent DNS error */
#define AFS_CELL_FL_DNS_FAIL 3 /* Failed to access DNS */
#define AFS_CELL_FL_NO_LOOKUP_YET 4 /* Not completed first DNS lookup yet */
enum afs_cell_state state;
short error;
/* Active fileserver interaction state. */
struct list_head proc_volumes; /* procfs volume list */
rwlock_t proc_lock;
/* VL server list. */
rwlock_t vl_addrs_lock; /* Lock on vl_addrs */
struct afs_addr_list __rcu *vl_addrs; /* List of VL servers */
u8 name_len; /* Length of name */
char name[64 + 1]; /* Cell name, case-flattened and NUL-padded */
};
/*
* Cached VLDB entry.
*
* This is pointed to by cell->vldb_entries, indexed by name.
*/
struct afs_vldb_entry {
afs_volid_t vid[3]; /* Volume IDs for R/W, R/O and Bak volumes */
unsigned long flags;
#define AFS_VLDB_HAS_RW 0 /* - R/W volume exists */
#define AFS_VLDB_HAS_RO 1 /* - R/O volume exists */
#define AFS_VLDB_HAS_BAK 2 /* - Backup volume exists */
#define AFS_VLDB_QUERY_VALID 3 /* - Record is valid */
#define AFS_VLDB_QUERY_ERROR 4 /* - VL server returned error */
uuid_t fs_server[AFS_NMAXNSERVERS];
u8 fs_mask[AFS_NMAXNSERVERS];
#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) */
short error;
u8 nr_servers; /* Number of server records */
u8 name_len;
u8 name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */
};
/*
* Record of fileserver with which we're actively communicating.
*/
struct afs_server {
struct rcu_head rcu;
union {
uuid_t uuid; /* Server ID */
struct afs_uuid _uuid;
};
struct afs_addr_list __rcu *addresses;
struct rb_node uuid_rb; /* Link in net->servers */
struct hlist_node addr4_link; /* Link in net->fs_addresses4 */
struct hlist_node addr6_link; /* Link in net->fs_addresses6 */
struct hlist_node proc_link; /* Link in net->fs_proc */
struct afs_server *gc_next; /* Next server in manager's list */
time64_t put_time; /* Time at which last put */
time64_t update_at; /* Time at which to next update the record */
unsigned long flags;
#define AFS_SERVER_FL_NEW 0 /* New server, don't inc cb_s_break */
#define AFS_SERVER_FL_NOT_READY 1 /* The record is not ready for use */
#define AFS_SERVER_FL_NOT_FOUND 2 /* VL server says no such server */
#define AFS_SERVER_FL_VL_FAIL 3 /* Failed to access VL server */
#define AFS_SERVER_FL_UPDATING 4
#define AFS_SERVER_FL_PROBED 5 /* The fileserver has been probed */
#define AFS_SERVER_FL_PROBING 6 /* Fileserver is being probed */
#define AFS_SERVER_FL_NO_IBULK 7 /* Fileserver doesn't support FS.InlineBulkStatus */
#define AFS_SERVER_FL_MAY_HAVE_CB 8 /* May have callbacks on this fileserver */
atomic_t usage;
u32 addr_version; /* Address list version */
/* file service access */
rwlock_t fs_lock; /* access lock */
/* callback promise management */
struct list_head cb_interests; /* List of superblocks using this server */
unsigned cb_s_break; /* Break-everything counter. */
rwlock_t cb_break_lock; /* Volume finding lock */
};
/*
* Interest by a superblock on a server.
*/
struct afs_cb_interest {
struct list_head cb_link; /* Link in server->cb_interests */
struct afs_server *server; /* Server on which this interest resides */
struct super_block *sb; /* Superblock on which inodes reside */
afs_volid_t vid; /* Volume ID to match */
refcount_t usage;
};
/*
* Replaceable server list.
*/
struct afs_server_entry {
struct afs_server *server;
struct afs_cb_interest *cb_interest;
};
struct afs_server_list {
refcount_t usage;
unsigned short nr_servers;
unsigned short index; /* Server currently in use */
unsigned short vnovol_mask; /* Servers to be skipped due to VNOVOL */
unsigned int seq; /* Set to ->servers_seq when installed */
rwlock_t lock;
struct afs_server_entry servers[];
};
/*
* Live AFS volume management.
*/
struct afs_volume {
afs_volid_t vid; /* volume ID */
atomic_t usage;
time64_t update_at; /* Time at which to next update */
struct afs_cell *cell; /* Cell to which belongs (pins ref) */
struct list_head proc_link; /* Link in cell->vl_proc */
unsigned long flags;
#define AFS_VOLUME_NEEDS_UPDATE 0 /* - T if an update needs performing */
#define AFS_VOLUME_UPDATING 1 /* - T if an update is in progress */
#define AFS_VOLUME_WAIT 2 /* - T if users must wait for update */
#define AFS_VOLUME_DELETED 3 /* - T if volume appears deleted */
#define AFS_VOLUME_OFFLINE 4 /* - T if volume offline notice given */
#define AFS_VOLUME_BUSY 5 /* - T if volume busy notice given */
#ifdef CONFIG_AFS_FSCACHE
struct fscache_cookie *cache; /* caching cookie */
#endif
struct afs_server_list *servers; /* List of servers on which volume resides */
rwlock_t servers_lock; /* Lock for ->servers */
unsigned int servers_seq; /* Incremented each time ->servers changes */
unsigned cb_v_break; /* Break-everything counter. */
rwlock_t cb_break_lock;
afs_voltype_t type; /* type of volume */
short error;
char type_force; /* force volume type (suppress R/O -> R/W) */
u8 name_len;
u8 name[AFS_MAXVOLNAME + 1]; /* NUL-padded volume name */
};
enum afs_lock_state {
AFS_VNODE_LOCK_NONE, /* The vnode has no lock on the server */
AFS_VNODE_LOCK_WAITING_FOR_CB, /* We're waiting for the server to break the callback */
AFS_VNODE_LOCK_SETTING, /* We're asking the server for a lock */
AFS_VNODE_LOCK_GRANTED, /* We have a lock on the server */
AFS_VNODE_LOCK_EXTENDING, /* We're extending a lock on the server */
AFS_VNODE_LOCK_NEED_UNLOCK, /* We need to unlock on the server */
AFS_VNODE_LOCK_UNLOCKING, /* We're telling the server to unlock */
};
/*
* AFS inode private data.
*
* Note that afs_alloc_inode() *must* reset anything that could incorrectly
* leak from one inode to another.
*/
struct afs_vnode {
struct inode vfs_inode; /* the VFS's inode record */
struct afs_volume *volume; /* volume on which vnode resides */
struct afs_fid fid; /* the file identifier for this inode */
struct afs_file_status status; /* AFS status info for this file */
afs_dataversion_t invalid_before; /* Child dentries are invalid before this */
#ifdef CONFIG_AFS_FSCACHE
struct fscache_cookie *cache; /* caching cookie */
#endif
struct afs_permits __rcu *permit_cache; /* cache of permits so far obtained */
struct mutex io_lock; /* Lock for serialising I/O on this mutex */
struct rw_semaphore validate_lock; /* lock for validating this vnode */
spinlock_t wb_lock; /* lock for wb_keys */
spinlock_t lock; /* waitqueue/flags lock */
unsigned long flags;
#define AFS_VNODE_CB_PROMISED 0 /* Set if vnode has a callback promise */
#define AFS_VNODE_UNSET 1 /* set if vnode attributes not yet set */
#define AFS_VNODE_DIR_VALID 2 /* Set if dir contents are valid */
#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 */
#define AFS_VNODE_AUTOCELL 6 /* set if Vnode is an auto mount point */
#define AFS_VNODE_PSEUDODIR 7 /* set if Vnode is a pseudo directory */
#define AFS_VNODE_NEW_CONTENT 8 /* Set if file has new content (create/trunc-0) */
struct list_head wb_keys; /* List of keys available for writeback */
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 *lock_key; /* Key to be used in lock ops */
enum afs_lock_state lock_state : 8;
afs_lock_type_t lock_type : 8;
/* outstanding callback notification on this file */
struct afs_cb_interest *cb_interest; /* Server on which this resides */
unsigned int cb_s_break; /* Mass break counter on ->server */
unsigned int cb_v_break; /* Mass break counter on ->volume */
unsigned int cb_break; /* Break counter on vnode */
seqlock_t cb_lock; /* Lock for ->cb_interest, ->status, ->cb_*break */
time64_t cb_expires_at; /* time at which callback expires */
unsigned cb_version; /* callback version */
afs_callback_type_t cb_type; /* type of callback */
};
/*
* 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; /* CallerAccess value for this key */
};
/*
* Immutable cache of CallerAccess records from attempts to access vnodes.
* These may be shared between multiple vnodes.
*/
struct afs_permits {
struct rcu_head rcu;
struct hlist_node hash_node; /* Link in hash */
unsigned long h; /* Hash value for this permit list */
refcount_t usage;
unsigned short nr_permits; /* Number of records */
bool invalidated; /* Invalidated due to key change */
struct afs_permit permits[]; /* List of permits sorted by key pointer */
};
/*
* 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 */
};
/*
* Cursor for iterating over a server's address list.
*/
struct afs_addr_cursor {
struct afs_addr_list *alist; /* Current address list (pins ref) */
struct sockaddr_rxrpc *addr;
u32 abort_code;
unsigned short start; /* Starting point in alist->addrs[] */
unsigned short index; /* Wrapping offset from start to current addr */
short error;
bool begun; /* T if we've begun iteration */
bool responded; /* T if the current address responded */
};
/*
* Cursor for iterating over a set of fileservers.
*/
struct afs_fs_cursor {
struct afs_addr_cursor ac;
struct afs_vnode *vnode;
struct afs_server_list *server_list; /* Current server list (pins ref) */
struct afs_cb_interest *cbi; /* Server on which this resides (pins ref) */
struct key *key; /* Key for the server */
unsigned int cb_break; /* cb_break + cb_s_break before the call */
unsigned int cb_break_2; /* cb_break + cb_s_break (2nd vnode) */
unsigned char start; /* Initial index in server list */
unsigned char index; /* Number of servers tried beyond start */
unsigned short flags;
#define AFS_FS_CURSOR_STOP 0x0001 /* Set to cease iteration */
#define AFS_FS_CURSOR_VBUSY 0x0002 /* Set if seen VBUSY */
#define AFS_FS_CURSOR_VMOVED 0x0004 /* Set if seen VMOVED */
#define AFS_FS_CURSOR_VNOVOL 0x0008 /* Set if seen VNOVOL */
#define AFS_FS_CURSOR_CUR_ONLY 0x0010 /* Set if current server only (file lock held) */
#define AFS_FS_CURSOR_NO_VSLEEP 0x0020 /* Set to prevent sleep on VBUSY, VOFFLINE, ... */
};
/*
* Cache auxiliary data.
*/
struct afs_vnode_cache_aux {
u64 data_version;
} __packed;
#include <trace/events/afs.h>
/*****************************************************************************/
/*
* addr_list.c
*/
static inline struct afs_addr_list *afs_get_addrlist(struct afs_addr_list *alist)
{
if (alist)
refcount_inc(&alist->usage);
return alist;
}
extern struct afs_addr_list *afs_alloc_addrlist(unsigned int,
unsigned short,
unsigned short);
extern void afs_put_addrlist(struct afs_addr_list *);
extern struct afs_addr_list *afs_parse_text_addrs(const char *, size_t, char,
unsigned short, unsigned short);
extern struct afs_addr_list *afs_dns_query(struct afs_cell *, time64_t *);
extern bool afs_iterate_addresses(struct afs_addr_cursor *);
extern int afs_end_cursor(struct afs_addr_cursor *);
extern int afs_set_vl_cursor(struct afs_addr_cursor *, struct afs_cell *);
extern void afs_merge_fs_addr4(struct afs_addr_list *, __be32, u16);
extern void afs_merge_fs_addr6(struct afs_addr_list *, __be32 *, u16);
/*
* 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_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_volume_cache_index_def (*(struct fscache_cookie_def *) NULL)
#define afs_vnode_cache_index_def (*(struct fscache_cookie_def *) NULL)
#endif
/*
* callback.c
*/
extern void afs_init_callback_state(struct afs_server *);
extern void afs_break_callback(struct afs_vnode *);
extern void afs_break_callbacks(struct afs_server *, size_t, struct afs_callback_break*);
extern int afs_register_server_cb_interest(struct afs_vnode *,
struct afs_server_list *, unsigned int);
extern void afs_put_cb_interest(struct afs_net *, struct afs_cb_interest *);
extern void afs_clear_callback_interests(struct afs_net *, struct afs_server_list *);
static inline struct afs_cb_interest *afs_get_cb_interest(struct afs_cb_interest *cbi)
{
if (cbi)
refcount_inc(&cbi->usage);
return cbi;
}
static inline unsigned int afs_calc_vnode_cb_break(struct afs_vnode *vnode)
{
return vnode->cb_break + vnode->cb_s_break + vnode->cb_v_break;
}
static inline unsigned int afs_cb_break_sum(struct afs_vnode *vnode,
struct afs_cb_interest *cbi)
{
return vnode->cb_break + cbi->server->cb_s_break + vnode->volume->cb_v_break;
}
/*
* cell.c
*/
extern int afs_cell_init(struct afs_net *, const char *);
extern struct afs_cell *afs_lookup_cell_rcu(struct afs_net *, const char *, unsigned);
extern struct afs_cell *afs_lookup_cell(struct afs_net *, const char *, unsigned,
const char *, bool);
extern struct afs_cell *afs_get_cell(struct afs_cell *);
extern void afs_put_cell(struct afs_net *, struct afs_cell *);
extern void afs_manage_cells(struct work_struct *);
extern void afs_cells_timer(struct timer_list *);
extern void __net_exit afs_cell_purge(struct afs_net *);
/*
* cmservice.c
*/
extern bool afs_cm_incoming_call(struct afs_call *);
/*
* dir.c
*/
extern const struct file_operations afs_dir_file_operations;
extern const struct inode_operations afs_dir_inode_operations;
extern const struct address_space_operations afs_dir_aops;
extern const struct dentry_operations afs_fs_dentry_operations;
extern void afs_d_release(struct dentry *);
/*
* dir_edit.c
*/
extern void afs_edit_dir_add(struct afs_vnode *, struct qstr *, struct afs_fid *,
enum afs_edit_dir_reason);
extern void afs_edit_dir_remove(struct afs_vnode *, struct qstr *, enum afs_edit_dir_reason);
/*
* dynroot.c
*/
extern const struct file_operations afs_dynroot_file_operations;
extern const struct inode_operations afs_dynroot_inode_operations;
extern const struct dentry_operations afs_dynroot_dentry_operations;
extern struct inode *afs_try_auto_mntpt(struct dentry *, struct inode *);
/*
* file.c
*/
extern const struct address_space_operations afs_fs_aops;
extern const struct inode_operations afs_file_inode_operations;
extern const struct file_operations afs_file_operations;
extern int afs_cache_wb_key(struct afs_vnode *, struct afs_file *);
extern void afs_put_wb_key(struct afs_wb_key *);
extern int afs_open(struct inode *, struct file *);
extern int afs_release(struct inode *, struct file *);
extern int afs_fetch_data(struct afs_vnode *, struct key *, struct afs_read *);
extern int afs_page_filler(void *, struct page *);
extern void afs_put_read(struct afs_read *);
/*
* flock.c
*/
extern struct workqueue_struct *afs_lock_manager;
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 *);
/*
* fsclient.c
*/
#define AFS_VNODE_NOT_YET_SET 0x01
#define AFS_VNODE_META_CHANGED 0x02
#define AFS_VNODE_DATA_CHANGED 0x04
extern void afs_update_inode_from_status(struct afs_vnode *, struct afs_file_status *,
const afs_dataversion_t *, u8);
extern int afs_fs_fetch_file_status(struct afs_fs_cursor *, struct afs_volsync *, bool);
extern int afs_fs_give_up_callbacks(struct afs_net *, struct afs_server *);
extern int afs_fs_fetch_data(struct afs_fs_cursor *, struct afs_read *);
extern int afs_fs_create(struct afs_fs_cursor *, const char *, umode_t, u64,
struct afs_fid *, struct afs_file_status *, struct afs_callback *);
extern int afs_fs_remove(struct afs_fs_cursor *, const char *, bool, u64);
extern int afs_fs_link(struct afs_fs_cursor *, struct afs_vnode *, const char *, u64);
extern int afs_fs_symlink(struct afs_fs_cursor *, const char *, const char *, u64,
struct afs_fid *, struct afs_file_status *);
extern int afs_fs_rename(struct afs_fs_cursor *, const char *,
struct afs_vnode *, const char *, u64, u64);
extern int afs_fs_store_data(struct afs_fs_cursor *, struct address_space *,
pgoff_t, pgoff_t, unsigned, unsigned);
extern int afs_fs_setattr(struct afs_fs_cursor *, struct iattr *);
extern int afs_fs_get_volume_status(struct afs_fs_cursor *, struct afs_volume_status *);
extern int afs_fs_set_lock(struct afs_fs_cursor *, afs_lock_type_t);
extern int afs_fs_extend_lock(struct afs_fs_cursor *);
extern int afs_fs_release_lock(struct afs_fs_cursor *);
extern int afs_fs_give_up_all_callbacks(struct afs_net *, struct afs_server *,
struct afs_addr_cursor *, struct key *);
extern int afs_fs_get_capabilities(struct afs_net *, struct afs_server *,
struct afs_addr_cursor *, struct key *);
extern int afs_fs_inline_bulk_status(struct afs_fs_cursor *, struct afs_net *,
struct afs_fid *, struct afs_file_status *,
struct afs_callback *, unsigned int,
struct afs_volsync *);
extern int afs_fs_fetch_status(struct afs_fs_cursor *, struct afs_net *,
struct afs_fid *, struct afs_file_status *,
struct afs_callback *, struct afs_volsync *);
/*
* inode.c
*/
extern int afs_fetch_status(struct afs_vnode *, struct key *, bool);
extern int afs_iget5_test(struct inode *, void *);
extern struct inode *afs_iget_pseudo_dir(struct super_block *, bool);
extern struct inode *afs_iget(struct super_block *, struct key *,
struct afs_fid *, struct afs_file_status *,
struct afs_callback *,
struct afs_cb_interest *);
extern void afs_zap_data(struct afs_vnode *);
extern int afs_validate(struct afs_vnode *, struct key *);
extern int afs_getattr(const struct path *, struct kstat *, u32, unsigned int);
extern int afs_setattr(struct dentry *, struct iattr *);
extern void afs_evict_inode(struct inode *);
extern int afs_drop_inode(struct inode *);
/*
* main.c
*/
extern struct workqueue_struct *afs_wq;
extern int afs_net_id;
static inline struct afs_net *afs_net(struct net *net)
{
return net_generic(net, afs_net_id);
}
static inline struct afs_net *afs_sb2net(struct super_block *sb)
{
return afs_net(AFS_FS_S(sb)->net_ns);
}
static inline struct afs_net *afs_d2net(struct dentry *dentry)
{
return afs_sb2net(dentry->d_sb);
}
static inline struct afs_net *afs_i2net(struct inode *inode)
{
return afs_sb2net(inode->i_sb);
}
static inline struct afs_net *afs_v2net(struct afs_vnode *vnode)
{
return afs_i2net(&vnode->vfs_inode);
}
static inline struct afs_net *afs_sock2net(struct sock *sk)
{
return net_generic(sock_net(sk), afs_net_id);
}
static inline void __afs_stat(atomic_t *s)
{
atomic_inc(s);
}
#define afs_stat_v(vnode, n) __afs_stat(&afs_v2net(vnode)->n)
/*
* misc.c
*/
extern int afs_abort_to_error(u32);
/*
* mntpt.c
*/
extern const struct inode_operations afs_mntpt_inode_operations;
extern const struct inode_operations afs_autocell_inode_operations;
extern const struct file_operations afs_mntpt_file_operations;
extern struct vfsmount *afs_d_automount(struct path *);
extern void afs_mntpt_kill_timer(void);
/*
* netdevices.c
*/
extern int afs_get_ipv4_interfaces(struct afs_net *, struct afs_interface *,
size_t, bool);
/*
* proc.c
*/
#ifdef CONFIG_PROC_FS
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_cell *);
extern void afs_proc_cell_remove(struct afs_cell *);
extern void afs_put_sysnames(struct afs_sysnames *);
#else
static inline int afs_proc_init(struct afs_net *net) { return 0; }
static inline void afs_proc_cleanup(struct afs_net *net) {}
static inline int afs_proc_cell_setup(struct afs_cell *cell) { return 0; }
static inline void afs_proc_cell_remove(struct afs_cell *cell) {}
static inline void afs_put_sysnames(struct afs_sysnames *sysnames) {}
#endif
/*
* rotate.c
*/
extern bool afs_begin_vnode_operation(struct afs_fs_cursor *, struct afs_vnode *,
struct key *);
extern bool afs_select_fileserver(struct afs_fs_cursor *);
extern bool afs_select_current_fileserver(struct afs_fs_cursor *);
extern int afs_end_vnode_operation(struct afs_fs_cursor *);
/*
* rxrpc.c
*/
extern struct workqueue_struct *afs_async_calls;
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 *);
extern void afs_put_call(struct afs_call *);
extern int afs_queue_call_work(struct afs_call *);
extern long afs_make_call(struct afs_addr_cursor *, struct afs_call *, gfp_t, bool);
extern struct afs_call *afs_alloc_flat_call(struct afs_net *,
const struct afs_call_type *,
size_t, size_t);
extern void afs_flat_call_destructor(struct afs_call *);
extern void afs_send_empty_reply(struct afs_call *);
extern void afs_send_simple_reply(struct afs_call *, const void *, size_t);
extern int afs_extract_data(struct afs_call *, void *, size_t, bool);
extern int afs_protocol_error(struct afs_call *, int);
static inline int afs_transfer_reply(struct afs_call *call)
{
return afs_extract_data(call, call->buffer, call->reply_max, false);
}
static inline bool afs_check_call_state(struct afs_call *call,
enum afs_call_state state)
{
return READ_ONCE(call->state) == state;
}
static inline bool afs_set_call_state(struct afs_call *call,
enum afs_call_state from,
enum afs_call_state to)
{
bool ok = false;
spin_lock_bh(&call->state_lock);
if (call->state == from) {
call->state = to;
trace_afs_call_state(call, from, to, 0, 0);
ok = true;
}
spin_unlock_bh(&call->state_lock);
return ok;
}
static inline void afs_set_call_complete(struct afs_call *call,
int error, u32 remote_abort)
{
enum afs_call_state state;
bool ok = false;
spin_lock_bh(&call->state_lock);
state = call->state;
if (state != AFS_CALL_COMPLETE) {
call->abort_code = remote_abort;
call->error = error;
call->state = AFS_CALL_COMPLETE;
trace_afs_call_state(call, state, AFS_CALL_COMPLETE,
error, remote_abort);
ok = true;
}
spin_unlock_bh(&call->state_lock);
if (ok)
trace_afs_call_done(call);
}
/*
* security.c
*/
extern void afs_put_permits(struct afs_permits *);
extern void afs_clear_permits(struct afs_vnode *);
extern void afs_cache_permit(struct afs_vnode *, struct key *, unsigned int);
extern void afs_zap_permits(struct rcu_head *);
extern struct key *afs_request_key(struct afs_cell *);
extern int afs_check_permit(struct afs_vnode *, struct key *, afs_access_t *);
extern int afs_permission(struct inode *, int);
extern void __exit afs_clean_up_permit_cache(void);
/*
* server.c
*/
extern spinlock_t afs_server_peer_lock;
static inline struct afs_server *afs_get_server(struct afs_server *server)
{
atomic_inc(&server->usage);
return server;
}
extern struct afs_server *afs_find_server(struct afs_net *,
const struct sockaddr_rxrpc *);
extern struct afs_server *afs_find_server_by_uuid(struct afs_net *, const uuid_t *);
extern struct afs_server *afs_lookup_server(struct afs_cell *, struct key *, const uuid_t *);
extern void afs_put_server(struct afs_net *, struct afs_server *);
extern void afs_manage_servers(struct work_struct *);
extern void afs_servers_timer(struct timer_list *);
extern void __net_exit afs_purge_servers(struct afs_net *);
extern bool afs_probe_fileserver(struct afs_fs_cursor *);
extern bool afs_check_server_record(struct afs_fs_cursor *, struct afs_server *);
/*
* server_list.c
*/
static inline struct afs_server_list *afs_get_serverlist(struct afs_server_list *slist)
{
refcount_inc(&slist->usage);
return slist;
}
extern void afs_put_serverlist(struct afs_net *, struct afs_server_list *);
extern struct afs_server_list *afs_alloc_server_list(struct afs_cell *, struct key *,
struct afs_vldb_entry *,
u8);
extern bool afs_annotate_server_list(struct afs_server_list *, struct afs_server_list *);
/*
* super.c
*/
extern int __init afs_fs_init(void);
extern void afs_fs_exit(void);
/*
* vlclient.c
*/
extern struct afs_vldb_entry *afs_vl_get_entry_by_name_u(struct afs_net *,
struct afs_addr_cursor *,
struct key *, const char *, int);
extern struct afs_addr_list *afs_vl_get_addrs_u(struct afs_net *, struct afs_addr_cursor *,
struct key *, const uuid_t *);
extern int afs_vl_get_capabilities(struct afs_net *, struct afs_addr_cursor *, struct key *);
extern struct afs_addr_list *afs_yfsvl_get_endpoints(struct afs_net *, struct afs_addr_cursor *,
struct key *, const uuid_t *);
/*
* volume.c
*/
static inline struct afs_volume *__afs_get_volume(struct afs_volume *volume)
{
if (volume)
atomic_inc(&volume->usage);
return volume;
}
extern struct afs_volume *afs_create_volume(struct afs_mount_params *);
extern void afs_activate_volume(struct afs_volume *);
extern void afs_deactivate_volume(struct afs_volume *);
extern void afs_put_volume(struct afs_cell *, struct afs_volume *);
extern int afs_check_volume_status(struct afs_volume *, struct key *);
/*
* write.c
*/
extern int afs_set_page_dirty(struct page *);
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);
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 *);
extern ssize_t afs_file_write(struct kiocb *, struct iov_iter *);
extern int afs_fsync(struct file *, loff_t, loff_t, int);
extern int afs_page_mkwrite(struct vm_fault *);
extern void afs_prune_wb_keys(struct afs_vnode *);
extern int afs_launder_page(struct page *);
/*
* xattr.c
*/
extern const struct xattr_handler *afs_xattr_handlers[];
extern ssize_t afs_listxattr(struct dentry *, char *, size_t);
/*
* Miscellaneous inline functions.
*/
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;
}
static inline void afs_vnode_commit_status(struct afs_fs_cursor *fc,
struct afs_vnode *vnode,
unsigned int cb_break)
{
if (fc->ac.error == 0)
afs_cache_permit(vnode, fc->key, cb_break);
}
static inline void afs_check_for_remote_deletion(struct afs_fs_cursor *fc,
struct afs_vnode *vnode)
{
if (fc->ac.error == -ENOENT) {
set_bit(AFS_VNODE_DELETED, &vnode->flags);
afs_break_callback(vnode);
}
}
/*****************************************************************************/
/*
* debug tracing
*/
extern unsigned afs_debug;
#define dbgprintk(FMT,...) \
printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
#define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
#define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
#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
#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__)
#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)
#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)
#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)
#define ASSERTRANGE(L, OP1, N, OP2, H) \
do { \
} while(0)
#define ASSERTIF(C, X) \
do { \
} while(0)
#define ASSERTIFCMP(C, X, OP, Y) \
do { \
} while(0)
#endif /* __KDEBUGALL */
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