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OpenCloudOS-Kernel/fs/afs/internal.h

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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/fs.h>
#include <linux/pagemap.h>
#include <linux/skbuff.h>
#include <linux/rxrpc.h>
#include <linux/key.h>
#include <linux/workqueue.h>
#include <linux/sched.h>
#include "afs.h"
#include "afs_vl.h"
#define AFS_CELL_MAX_ADDRS 15
struct pagevec;
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;
struct afs_mount_params {
bool rwpath; /* T if the parent should be considered R/W */
bool force; /* T to force cell type */
afs_voltype_t type; /* type of volume requested */
int volnamesz; /* size of volume name */
const char *volname; /* name of volume to mount */
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 */
};
/*
* definition of how to wait for the completion of an operation
*/
struct afs_wait_mode {
/* RxRPC received message notification */
void (*rx_wakeup)(struct afs_call *call);
/* synchronous call waiter and call dispatched notification */
int (*wait)(struct afs_call *call);
/* asynchronous call completion */
void (*async_complete)(void *reply, int error);
};
extern const struct afs_wait_mode afs_sync_call;
extern const struct afs_wait_mode afs_async_call;
/*
* a record of an in-progress RxRPC call
*/
struct afs_call {
const struct afs_call_type *type; /* type of call */
const struct afs_wait_mode *wait_mode; /* completion wait mode */
wait_queue_head_t waitq; /* processes awaiting completion */
struct work_struct async_work; /* asynchronous work processor */
struct work_struct work; /* actual work processor */
struct sk_buff_head rx_queue; /* received packets */
struct rxrpc_call *rxcall; /* RxRPC call handle */
struct key *key; /* security for this call */
struct afs_server *server; /* server affected by incoming CM call */
void *request; /* request data (first part) */
struct address_space *mapping; /* page set */
struct afs_writeback *wb; /* writeback being performed */
void *buffer; /* reply receive buffer */
void *reply; /* reply buffer (first part) */
void *reply2; /* reply buffer (second part) */
void *reply3; /* reply buffer (third part) */
void *reply4; /* reply buffer (fourth part) */
pgoff_t first; /* first page in mapping to deal with */
pgoff_t last; /* last page in mapping to deal with */
enum { /* 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, /* successfully completed */
AFS_CALL_BUSY, /* server was busy */
AFS_CALL_ABORTED, /* call was aborted */
AFS_CALL_ERROR, /* call failed due to error */
} state;
int error; /* error code */
unsigned request_size; /* size of request data */
unsigned reply_max; /* maximum size of reply */
unsigned reply_size; /* current size of reply */
unsigned first_offset; /* offset into mapping[first] */
unsigned last_to; /* amount of mapping[last] */
unsigned short offset; /* offset into received data store */
unsigned char unmarshall; /* unmarshalling phase */
bool incoming; /* T if incoming call */
bool send_pages; /* T if data from mapping should be sent */
u16 service_id; /* RxRPC service ID to call */
__be16 port; /* target UDP port */
__be32 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 store_version; /* updated version expected from store */
};
struct afs_call_type {
const char *name;
/* deliver request or reply data to an call
* - returning an error will cause the call to be aborted
*/
int (*deliver)(struct afs_call *call, struct sk_buff *skb,
bool last);
/* 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);
};
/*
* 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));
};
/*
* AFS superblock private data
* - there's one superblock per volume
*/
struct afs_super_info {
struct afs_volume *volume; /* volume record */
char rwparent; /* T if parent is R/W AFS volume */
};
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;
/*
* entry in the cached cell catalogue
*/
struct afs_cache_cell {
char name[AFS_MAXCELLNAME]; /* cell name (padded with NULs) */
struct in_addr vl_servers[15]; /* cached cell VL servers */
};
/*
* AFS cell record
*/
struct afs_cell {
atomic_t usage;
struct list_head link; /* main cell list link */
struct key *anonymous_key; /* anonymous user key for this cell */
struct list_head proc_link; /* /proc cell list link */
struct proc_dir_entry *proc_dir; /* /proc dir for this cell */
#ifdef AFS_CACHING_SUPPORT
struct cachefs_cookie *cache; /* caching cookie */
#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 {
/* volume name (lowercase, padded with NULs) */
uint8_t name[AFS_MAXVOLNAME + 1];
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;
time_t time_of_death; /* time at which put reduced usage to 0 */
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 */
#ifdef AFS_CACHING_SUPPORT
struct cachefs_cookie *cache; /* caching cookie */
#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 */
time_t update_at; /* time at which record should be updated */
spinlock_t lock; /* access lock */
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;
time_t time_of_death; /* time at which put reduced usage to 0 */
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 */
#ifdef AFS_CACHING_SUPPORT
struct cachefs_cookie *cache; /* caching cookie */
#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 */
#ifdef AFS_CACHING_SUPPORT
struct cachefs_cookie *cache; /* caching cookie */
#endif
struct afs_permits *permits; /* cache of permits so far obtained */
struct mutex permits_lock; /* lock for altering permits list */
struct mutex validate_lock; /* lock for validating this vnode */
wait_queue_head_t update_waitq; /* status fetch waitqueue */
int update_cnt; /* number of outstanding ops that will update the
* status */
spinlock_t writeback_lock; /* lock for writebacks */
spinlock_t lock; /* waitqueue/flags lock */
unsigned long flags;
#define AFS_VNODE_CB_BROKEN 0 /* set if vnode's callback was broken */
#define AFS_VNODE_UNSET 1 /* set if vnode attributes not yet set */
#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 */
#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 */
long acl_order; /* ACL check count (callback break count) */
struct list_head writebacks; /* alterations in pagecache that need writing */
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 */
/* 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 */
time_t cb_expires; /* time at which callback expires */
time_t cb_expires_at; /* time used to order cb_promise */
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 */
};
/*
* 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 */
};
/*
* 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 */
};
/*
* UUID definition [internet draft]
* - the timestamp is a 60-bit value, split 32/16/12, and goes in 100ns
* increments since midnight 15th October 1582
* - add AFS_UUID_TO_UNIX_TIME to convert unix time in 100ns units to UUID
* time
* - the clock sequence is a 14-bit counter to avoid duplicate times
*/
struct afs_uuid {
u32 time_low; /* low part of timestamp */
u16 time_mid; /* mid part of timestamp */
u16 time_hi_and_version; /* high part of timestamp and version */
#define AFS_UUID_TO_UNIX_TIME 0x01b21dd213814000ULL
#define AFS_UUID_TIMEHI_MASK 0x0fff
#define AFS_UUID_VERSION_TIME 0x1000 /* time-based UUID */
#define AFS_UUID_VERSION_NAME 0x3000 /* name-based UUID */
#define AFS_UUID_VERSION_RANDOM 0x4000 /* (pseudo-)random generated UUID */
u8 clock_seq_hi_and_reserved; /* clock seq hi and variant */
#define AFS_UUID_CLOCKHI_MASK 0x3f
#define AFS_UUID_VARIANT_STD 0x80
u8 clock_seq_low; /* clock seq low */
u8 node[6]; /* spatially unique node ID (MAC addr) */
};
/*****************************************************************************/
/*
* callback.c
*/
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[]);
extern void afs_discard_callback_on_delete(struct afs_vnode *);
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 *);
extern int __init afs_callback_update_init(void);
extern void afs_callback_update_kill(void);
/*
* cell.c
*/
extern struct rw_semaphore afs_proc_cells_sem;
extern struct list_head afs_proc_cells;
#ifdef AFS_CACHING_SUPPORT
extern struct cachefs_index_def afs_cache_cell_index_def;
#endif
#define afs_get_cell(C) do { atomic_inc(&(C)->usage); } while(0)
extern int afs_cell_init(char *);
extern struct afs_cell *afs_cell_create(const char *, char *);
extern struct afs_cell *afs_cell_lookup(const char *, unsigned);
extern struct afs_cell *afs_grab_cell(struct afs_cell *);
extern void afs_put_cell(struct afs_cell *);
extern void afs_cell_purge(void);
/*
* cmservice.c
*/
extern bool afs_cm_incoming_call(struct afs_call *);
/*
* dir.c
*/
extern const struct inode_operations afs_dir_inode_operations;
extern const struct file_operations afs_dir_file_operations;
extern int afs_permission(struct inode *, int, struct nameidata *);
/*
* 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_open(struct inode *, struct file *);
extern int afs_release(struct inode *, struct file *);
/*
* flock.c
*/
extern void __exit afs_kill_lock_manager(void);
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
*/
extern int afs_fs_fetch_file_status(struct afs_server *, struct key *,
struct afs_vnode *, struct afs_volsync *,
const struct afs_wait_mode *);
extern int afs_fs_give_up_callbacks(struct afs_server *,
const struct afs_wait_mode *);
extern int afs_fs_fetch_data(struct afs_server *, struct key *,
struct afs_vnode *, off_t, size_t, struct page *,
const struct afs_wait_mode *);
extern int afs_fs_create(struct afs_server *, struct key *,
struct afs_vnode *, const char *, umode_t,
struct afs_fid *, struct afs_file_status *,
struct afs_callback *,
const struct afs_wait_mode *);
extern int afs_fs_remove(struct afs_server *, struct key *,
struct afs_vnode *, const char *, bool,
const struct afs_wait_mode *);
extern int afs_fs_link(struct afs_server *, struct key *, struct afs_vnode *,
struct afs_vnode *, const char *,
const struct afs_wait_mode *);
extern int afs_fs_symlink(struct afs_server *, struct key *,
struct afs_vnode *, const char *, const char *,
struct afs_fid *, struct afs_file_status *,
const struct afs_wait_mode *);
extern int afs_fs_rename(struct afs_server *, struct key *,
struct afs_vnode *, const char *,
struct afs_vnode *, const char *,
const struct afs_wait_mode *);
extern int afs_fs_store_data(struct afs_server *, struct afs_writeback *,
pgoff_t, pgoff_t, unsigned, unsigned,
const struct afs_wait_mode *);
extern int afs_fs_setattr(struct afs_server *, struct key *,
struct afs_vnode *, struct iattr *,
const struct afs_wait_mode *);
extern int afs_fs_get_volume_status(struct afs_server *, struct key *,
struct afs_vnode *,
struct afs_volume_status *,
const struct afs_wait_mode *);
extern int afs_fs_set_lock(struct afs_server *, struct key *,
struct afs_vnode *, afs_lock_type_t,
const struct afs_wait_mode *);
extern int afs_fs_extend_lock(struct afs_server *, struct key *,
struct afs_vnode *,
const struct afs_wait_mode *);
extern int afs_fs_release_lock(struct afs_server *, struct key *,
struct afs_vnode *,
const struct afs_wait_mode *);
/*
* inode.c
*/
extern struct inode *afs_iget(struct super_block *, struct key *,
struct afs_fid *, struct afs_file_status *,
struct afs_callback *);
extern void afs_zap_data(struct afs_vnode *);
extern int afs_validate(struct afs_vnode *, struct key *);
extern int afs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
extern int afs_setattr(struct dentry *, struct iattr *);
extern void afs_clear_inode(struct inode *);
/*
* main.c
*/
extern struct afs_uuid afs_uuid;
#ifdef AFS_CACHING_SUPPORT
extern struct cachefs_netfs afs_cache_netfs;
#endif
/*
* misc.c
*/
extern int afs_abort_to_error(u32);
/*
* mntpt.c
*/
extern const struct inode_operations afs_mntpt_inode_operations;
extern const struct file_operations afs_mntpt_file_operations;
extern int afs_mntpt_check_symlink(struct afs_vnode *, struct key *);
extern void afs_mntpt_kill_timer(void);
/*
* proc.c
*/
extern int afs_proc_init(void);
extern void afs_proc_cleanup(void);
extern int afs_proc_cell_setup(struct afs_cell *);
extern void afs_proc_cell_remove(struct afs_cell *);
/*
* rxrpc.c
*/
extern int afs_open_socket(void);
extern void afs_close_socket(void);
extern int afs_make_call(struct in_addr *, struct afs_call *, gfp_t,
const struct afs_wait_mode *);
extern struct afs_call *afs_alloc_flat_call(const struct afs_call_type *,
size_t, size_t);
extern void afs_flat_call_destructor(struct afs_call *);
extern void afs_transfer_reply(struct afs_call *, struct sk_buff *);
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 *, struct sk_buff *, bool, void *,
size_t);
/*
* security.c
*/
extern void afs_clear_permits(struct afs_vnode *);
extern void afs_cache_permit(struct afs_vnode *, struct key *, long);
extern void afs_zap_permits(struct rcu_head *);
extern struct key *afs_request_key(struct afs_cell *);
extern int afs_permission(struct inode *, int, struct nameidata *);
/*
* server.c
*/
extern spinlock_t afs_server_peer_lock;
#define afs_get_server(S) \
do { \
_debug("GET SERVER %d", atomic_read(&(S)->usage)); \
atomic_inc(&(S)->usage); \
} while(0)
extern struct afs_server *afs_lookup_server(struct afs_cell *,
const struct in_addr *);
extern struct afs_server *afs_find_server(const struct in_addr *);
extern void afs_put_server(struct afs_server *);
extern void __exit afs_purge_servers(void);
/*
* super.c
*/
extern int afs_fs_init(void);
extern void afs_fs_exit(void);
/*
* use-rtnetlink.c
*/
extern int afs_get_ipv4_interfaces(struct afs_interface *, size_t, bool);
extern int afs_get_MAC_address(u8 *, size_t);
/*
* vlclient.c
*/
#ifdef AFS_CACHING_SUPPORT
extern struct cachefs_index_def afs_vlocation_cache_index_def;
#endif
extern int afs_vl_get_entry_by_name(struct in_addr *, struct key *,
const char *, struct afs_cache_vlocation *,
const struct afs_wait_mode *);
extern int afs_vl_get_entry_by_id(struct in_addr *, struct key *,
afs_volid_t, afs_voltype_t,
struct afs_cache_vlocation *,
const struct afs_wait_mode *);
/*
* vlocation.c
*/
#define afs_get_vlocation(V) do { atomic_inc(&(V)->usage); } while(0)
extern int __init afs_vlocation_update_init(void);
extern struct afs_vlocation *afs_vlocation_lookup(struct afs_cell *,
struct key *,
const char *, size_t);
extern void afs_put_vlocation(struct afs_vlocation *);
extern void afs_vlocation_purge(void);
/*
* vnode.c
*/
#ifdef AFS_CACHING_SUPPORT
extern struct cachefs_index_def afs_vnode_cache_index_def;
#endif
extern struct afs_timer_ops afs_vnode_cb_timed_out_ops;
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;
}
extern void afs_vnode_finalise_status_update(struct afs_vnode *,
struct afs_server *);
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 *,
off_t, size_t, struct page *);
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 *);
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 *);
extern int afs_vnode_get_volume_status(struct afs_vnode *, struct key *,
struct afs_volume_status *);
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 *);
/*
* volume.c
*/
#ifdef AFS_CACHING_SUPPORT
extern struct cachefs_index_def afs_volume_cache_index_def;
#endif
#define afs_get_volume(V) do { atomic_inc(&(V)->usage); } while(0)
extern void afs_put_volume(struct afs_volume *);
extern struct afs_volume *afs_volume_lookup(struct afs_mount_params *);
extern struct afs_server *afs_volume_pick_fileserver(struct afs_vnode *);
extern int afs_volume_release_fileserver(struct afs_vnode *,
struct afs_server *, int);
/*
* write.c
*/
extern int afs_set_page_dirty(struct page *);
extern void afs_put_writeback(struct afs_writeback *);
extern int afs_prepare_write(struct file *, struct page *, unsigned, unsigned);
extern int afs_commit_write(struct file *, struct page *, unsigned, unsigned);
extern int afs_writepage(struct page *, struct writeback_control *);
extern int afs_writepages(struct address_space *, struct writeback_control *);
extern int afs_write_inode(struct inode *, int);
extern void afs_pages_written_back(struct afs_vnode *, struct afs_call *);
extern ssize_t afs_file_write(struct kiocb *, const struct iovec *,
unsigned long, loff_t);
extern int afs_writeback_all(struct afs_vnode *);
extern int afs_fsync(struct file *, struct dentry *, int);
/*****************************************************************************/
/*
* debug tracing
*/
extern unsigned afs_debug;
#define dbgprintk(FMT,...) \
printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
/* make sure we maintain the format strings, even when debugging is disabled */
static inline __attribute__((format(printf,1,2)))
void _dbprintk(const char *fmt, ...)
{
}
#define kenter(FMT,...) dbgprintk("==> %s("FMT")",__FUNCTION__ ,##__VA_ARGS__)
#define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__FUNCTION__ ,##__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,...) _dbprintk("==> %s("FMT")",__FUNCTION__ ,##__VA_ARGS__)
#define _leave(FMT,...) _dbprintk("<== %s()"FMT"",__FUNCTION__ ,##__VA_ARGS__)
#define _debug(FMT,...) _dbprintk(" "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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