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linux/fs/afs/internal.h
David Howells c56f9ec8b2 afs: Use refcount_t rather than atomic_t 
Use refcount_t rather than atomic_t in afs to make use of the count
checking facilities provided.

Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
Link: https://lore.kernel.org/r/165911277768.3745403.423349776836296452.stgit@warthog.procyon.org.uk/ # v1
2022-08-02 18:10:11 +01:00

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/* SPDX-License-Identifier: GPL-2.0-or-later */
/* internal AFS stuff
*
* Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*/
#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 <linux/mm_types.h>
#include <linux/dns_resolver.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_vnode;
/*
* Partial file-locking emulation mode. (The problem being that AFS3 only
* allows whole-file locks and no upgrading/downgrading).
*/
enum afs_flock_mode {
afs_flock_mode_unset,
afs_flock_mode_local, /* Local locking only */
afs_flock_mode_openafs, /* Don't get server lock for a partial lock */
afs_flock_mode_strict, /* Always get a server lock for a partial lock */
afs_flock_mode_write, /* Get an exclusive server lock for a partial lock */
};
struct afs_fs_context {
bool force; /* T to force cell type */
bool autocell; /* T if set auto mount operation */
bool dyn_root; /* T if dynamic root */
bool no_cell; /* T if the source is "none" (for dynroot) */
enum afs_flock_mode flock_mode; /* Partial file-locking emulation mode */
afs_voltype_t type; /* type of volume requested */
unsigned int volnamesz; /* size of volume name */
const char *volname; /* name of volume to mount */
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 */
};
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;
refcount_t usage;
u32 version; /* Version */
unsigned char max_addrs;
unsigned char nr_addrs;
unsigned char preferred; /* Preferred address */
unsigned char nr_ipv4; /* Number of IPv4 addresses */
enum dns_record_source source:8;
enum dns_lookup_status status:8;
unsigned long failed; /* Mask of addrs that failed locally/ICMP */
unsigned long responded; /* Mask of addrs that responded */
struct sockaddr_rxrpc addrs[];
#define AFS_MAX_ADDRESSES ((unsigned int)(sizeof(unsigned long) * 8))
};
/*
* a record of an in-progress RxRPC call
*/
struct afs_call {
const struct afs_call_type *type; /* type of call */
struct afs_addr_list *alist; /* Address is alist[addr_ix] */
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 *server; /* The fileserver record if fs op (pins ref) */
struct afs_vlserver *vlserver; /* The vlserver record if vl op */
void *request; /* request data (first part) */
size_t iov_len; /* Size of *iter to be used */
struct iov_iter def_iter; /* Default buffer/data iterator */
struct iov_iter *write_iter; /* Iterator defining write to be made */
struct iov_iter *iter; /* Iterator currently in use */
union { /* Convenience for ->def_iter */
struct kvec kvec[1];
struct bio_vec bvec[1];
};
void *buffer; /* reply receive buffer */
union {
long ret0; /* Value to reply with instead of 0 */
struct afs_addr_list *ret_alist;
struct afs_vldb_entry *ret_vldb;
char *ret_str;
};
struct afs_operation *op;
unsigned int server_index;
refcount_t ref;
enum afs_call_state state;
spinlock_t state_lock;
int error; /* error code */
u32 abort_code; /* Remote abort ID or 0 */
unsigned int max_lifespan; /* Maximum lifespan to set if not 0 */
unsigned request_size; /* size of request data */
unsigned reply_max; /* maximum size of reply */
unsigned count2; /* count used in unmarshalling */
unsigned char unmarshall; /* unmarshalling phase */
unsigned char addr_ix; /* Address in ->alist */
bool drop_ref; /* T if need to drop ref for incoming call */
bool need_attention; /* T if RxRPC poked us */
bool async; /* T if asynchronous */
bool upgrade; /* T to request service upgrade */
bool have_reply_time; /* T if have got reply_time */
bool intr; /* T if interruptible */
bool unmarshalling_error; /* T if an unmarshalling error occurred */
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 */
union { /* place to extract temporary data */
struct {
__be32 tmp_u;
__be32 tmp;
} __attribute__((packed));
__be64 tmp64;
};
ktime_t reply_time; /* Time of first reply packet */
};
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);
/* Call done function (gets called immediately on success or failure) */
void (*done)(struct afs_call *call);
};
/*
* 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 file_size; /* File size returned by server */
struct key *key; /* The key to use to reissue the read */
struct afs_vnode *vnode; /* The file being read into. */
struct netfs_io_subrequest *subreq; /* Fscache helper read request this belongs to */
afs_dataversion_t data_version; /* Version number returned by server */
refcount_t usage;
unsigned int call_debug_id;
unsigned int nr_pages;
int error;
void (*done)(struct afs_read *);
void (*cleanup)(struct afs_read *);
struct iov_iter *iter; /* Iterator representing the buffer */
struct iov_iter def_iter; /* Default iterator */
};
/*
* 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 */
enum afs_flock_mode flock_mode:8; /* File locking emulation mode */
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 *ws_cell;
struct work_struct cells_manager;
struct timer_list cells_timer;
atomic_t cells_outstanding;
struct rw_semaphore cells_lock;
struct mutex cells_alias_lock;
struct mutex proc_cells_lock;
struct hlist_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, fs_probe_*, fs_proc */
struct rb_root fs_servers; /* afs_server (by server UUID or address) */
struct list_head fs_probe_fast; /* List of afs_server to probe at 30s intervals */
struct list_head fs_probe_slow; /* List of afs_server to probe at 5m intervals */
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;
struct work_struct fs_prober;
struct timer_list fs_probe_timer;
atomic_t servers_outstanding;
/* File locking renewal management */
struct mutex lock_manager_mutex;
/* Misc */
struct super_block *dynroot_sb; /* Dynamic root mount superblock */
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 release_folio */
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_REMOVED,
};
/*
* 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.
*
* Two cells are determined to be aliases if they have an explicit alias (YFS
* only), share any VL servers in common or have at least one volume in common.
* "In common" means that the address list of the VL servers or the fileservers
* share at least one endpoint.
*/
struct afs_cell {
union {
struct rcu_head rcu;
struct rb_node net_node; /* Node in net->cells */
};
struct afs_net *net;
struct afs_cell *alias_of; /* The cell this is an alias of */
struct afs_volume *root_volume; /* The root.cell volume if there is one */
struct key *anonymous_key; /* anonymous user key for this cell */
struct work_struct manager; /* Manager for init/deinit/dns */
struct hlist_node proc_link; /* /proc cell list link */
time64_t dns_expiry; /* Time AFSDB/SRV record expires */
time64_t last_inactive; /* Time of last drop of usage count */
refcount_t ref; /* Struct refcount */
atomic_t active; /* Active usage counter */
unsigned long flags;
#define AFS_CELL_FL_NO_GC 0 /* The cell was added manually, don't auto-gc */
#define AFS_CELL_FL_DO_LOOKUP 1 /* DNS lookup requested */
#define AFS_CELL_FL_CHECK_ALIAS 2 /* Need to check for aliases */
enum afs_cell_state state;
short error;
enum dns_record_source dns_source:8; /* Latest source of data from lookup */
enum dns_lookup_status dns_status:8; /* Latest status of data from lookup */
unsigned int dns_lookup_count; /* Counter of DNS lookups */
unsigned int debug_id;
/* The volumes belonging to this cell */
struct rb_root volumes; /* Tree of volumes on this server */
struct hlist_head proc_volumes; /* procfs volume list */
seqlock_t volume_lock; /* For volumes */
/* Active fileserver interaction state. */
struct rb_root fs_servers; /* afs_server (by server UUID) */
seqlock_t fs_lock; /* For fs_servers */
struct rw_semaphore fs_open_mmaps_lock;
struct list_head fs_open_mmaps; /* List of vnodes that are mmapped */
atomic_t fs_s_break; /* Counter of CB.InitCallBackState messages */
/* VL server list. */
rwlock_t vl_servers_lock; /* Lock on vl_servers */
struct afs_vlserver_list __rcu *vl_servers;
u8 name_len; /* Length of name */
char *name; /* Cell name, case-flattened and NUL-padded */
};
/*
* Volume Location server record.
*/
struct afs_vlserver {
struct rcu_head rcu;
struct afs_addr_list __rcu *addresses; /* List of addresses for this VL server */
unsigned long flags;
#define AFS_VLSERVER_FL_PROBED 0 /* The VL server has been probed */
#define AFS_VLSERVER_FL_PROBING 1 /* VL server is being probed */
#define AFS_VLSERVER_FL_IS_YFS 2 /* Server is YFS not AFS */
#define AFS_VLSERVER_FL_RESPONDING 3 /* VL server is responding */
rwlock_t lock; /* Lock on addresses */
refcount_t ref;
unsigned int rtt; /* Server's current RTT in uS */
/* Probe state */
wait_queue_head_t probe_wq;
atomic_t probe_outstanding;
spinlock_t probe_lock;
struct {
unsigned int rtt; /* RTT in uS */
u32 abort_code;
short error;
unsigned short flags;
#define AFS_VLSERVER_PROBE_RESPONDED 0x01 /* At least once response (may be abort) */
#define AFS_VLSERVER_PROBE_IS_YFS 0x02 /* The peer appears to be YFS */
#define AFS_VLSERVER_PROBE_NOT_YFS 0x04 /* The peer appears not to be YFS */
#define AFS_VLSERVER_PROBE_LOCAL_FAILURE 0x08 /* A local failure prevented a probe */
} probe;
u16 port;
u16 name_len; /* Length of name */
char name[]; /* Server name, case-flattened */
};
/*
* Weighted list of Volume Location servers.
*/
struct afs_vlserver_entry {
u16 priority; /* Preference (as SRV) */
u16 weight; /* Weight (as SRV) */
enum dns_record_source source:8;
enum dns_lookup_status status:8;
struct afs_vlserver *server;
};
struct afs_vlserver_list {
struct rcu_head rcu;
refcount_t ref;
u8 nr_servers;
u8 index; /* Server currently in use */
u8 preferred; /* Preferred server */
enum dns_record_source source:8;
enum dns_lookup_status status:8;
rwlock_t lock;
struct afs_vlserver_entry servers[];
};
/*
* 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];
u32 addr_version[AFS_NMAXNSERVERS]; /* Registration change counters */
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 afs_cell *cell; /* Cell to which belongs (pins ref) */
struct rb_node uuid_rb; /* Link in net->fs_servers */
struct afs_server __rcu *uuid_next; /* Next server with same UUID */
struct afs_server *uuid_prev; /* Previous server with same UUID */
struct list_head probe_link; /* Link in net->fs_probe_list */
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 work_struct initcb_work; /* Work for CB.InitCallBackState* */
struct afs_server *gc_next; /* Next server in manager's list */
time64_t unuse_time; /* Time at which last unused */
unsigned long flags;
#define AFS_SERVER_FL_RESPONDING 0 /* The server is responding */
#define AFS_SERVER_FL_UPDATING 1
#define AFS_SERVER_FL_NEEDS_UPDATE 2 /* Fileserver address list is out of date */
#define AFS_SERVER_FL_NOT_READY 4 /* The record is not ready for use */
#define AFS_SERVER_FL_NOT_FOUND 5 /* VL server says no such server */
#define AFS_SERVER_FL_VL_FAIL 6 /* Failed to access VL server */
#define AFS_SERVER_FL_MAY_HAVE_CB 8 /* May have callbacks on this fileserver */
#define AFS_SERVER_FL_IS_YFS 16 /* Server is YFS not AFS */
#define AFS_SERVER_FL_NO_IBULK 17 /* Fileserver doesn't support FS.InlineBulkStatus */
#define AFS_SERVER_FL_NO_RM2 18 /* Fileserver doesn't support YFS.RemoveFile2 */
#define AFS_SERVER_FL_HAS_FS64 19 /* Fileserver supports FS.{Fetch,Store}Data64 */
refcount_t ref; /* Object refcount */
atomic_t active; /* Active user count */
u32 addr_version; /* Address list version */
unsigned int rtt; /* Server's current RTT in uS */
unsigned int debug_id; /* Debugging ID for traces */
/* file service access */
rwlock_t fs_lock; /* access lock */
/* callback promise management */
unsigned cb_s_break; /* Break-everything counter. */
/* Probe state */
unsigned long probed_at; /* Time last probe was dispatched (jiffies) */
wait_queue_head_t probe_wq;
atomic_t probe_outstanding;
spinlock_t probe_lock;
struct {
unsigned int rtt; /* RTT in uS */
u32 abort_code;
short error;
bool responded:1;
bool is_yfs:1;
bool not_yfs:1;
bool local_failure:1;
} probe;
};
/*
* Replaceable volume server list.
*/
struct afs_server_entry {
struct afs_server *server;
};
struct afs_server_list {
afs_volid_t vids[AFS_MAXTYPES]; /* Volume IDs */
refcount_t usage;
unsigned char nr_servers;
unsigned char preferred; /* Preferred server */
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 {
union {
struct rcu_head rcu;
afs_volid_t vid; /* volume ID */
};
refcount_t ref;
time64_t update_at; /* Time at which to next update */
struct afs_cell *cell; /* Cell to which belongs (pins ref) */
struct rb_node cell_node; /* Link in cell->volumes */
struct hlist_node proc_link; /* Link in cell->proc_volumes */
struct super_block __rcu *sb; /* Superblock on which inodes reside */
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 */
#define AFS_VOLUME_MAYBE_NO_IBULK 6 /* - T if some servers don't have InlineBulkStatus */
#ifdef CONFIG_AFS_FSCACHE
struct fscache_volume *cache; /* Caching cookie */
#endif
struct afs_server_list __rcu *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_v_break_lock;
afs_voltype_t type; /* type of volume */
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_VNODE_LOCK_DELETED, /* The vnode has been deleted whilst we have a lock */
};
/*
* 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 netfs_inode netfs; /* Netfslib context and vfs inode */
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 */
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 */
struct rw_semaphore rmdir_lock; /* Lock for rmdir vs sillyrename */
struct key *silly_key; /* Silly rename key */
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) */
#define AFS_VNODE_SILLY_DELETED 9 /* Set if file has been silly-deleted */
#define AFS_VNODE_MODIFYING 10 /* Set if we're performing a modification op */
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 */
ktime_t locked_at; /* Time at which lock obtained */
enum afs_lock_state lock_state : 8;
afs_lock_type_t lock_type : 8;
/* outstanding callback notification on this file */
struct work_struct cb_work; /* Work for mmap'd files */
struct list_head cb_mmap_link; /* Link in cell->fs_open_mmaps */
void *cb_server; /* Server with callback/filelock */
atomic_t cb_nr_mmap; /* Number of mmaps */
unsigned int cb_fs_s_break; /* Mass server break counter (cell->fs_s_break) */
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_server, ->status, ->cb_*break */
time64_t cb_expires_at; /* time at which callback expires */
};
static inline struct fscache_cookie *afs_vnode_cache(struct afs_vnode *vnode)
{
#ifdef CONFIG_AFS_FSCACHE
return netfs_i_cookie(&vnode->netfs);
#else
return NULL;
#endif
}
static inline void afs_vnode_set_cache(struct afs_vnode *vnode,
struct fscache_cookie *cookie)
{
#ifdef CONFIG_AFS_FSCACHE
vnode->netfs.cache = cookie;
#endif
}
/*
* 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 */
};
/*
* Error prioritisation and accumulation.
*/
struct afs_error {
short error; /* Accumulated error */
bool responded; /* T if server responded */
};
/*
* Cursor for iterating over a server's address list.
*/
struct afs_addr_cursor {
struct afs_addr_list *alist; /* Current address list (pins ref) */
unsigned long tried; /* Tried addresses */
signed char index; /* Current address */
bool responded; /* T if the current address responded */
unsigned short nr_iterations; /* Number of address iterations */
short error;
u32 abort_code;
};
/*
* Cursor for iterating over a set of volume location servers.
*/
struct afs_vl_cursor {
struct afs_addr_cursor ac;
struct afs_cell *cell; /* The cell we're querying */
struct afs_vlserver_list *server_list; /* Current server list (pins ref) */
struct afs_vlserver *server; /* Server on which this resides */
struct key *key; /* Key for the server */
unsigned long untried; /* Bitmask of untried servers */
short index; /* Current server */
short error;
unsigned short flags;
#define AFS_VL_CURSOR_STOP 0x0001 /* Set to cease iteration */
#define AFS_VL_CURSOR_RETRY 0x0002 /* Set to do a retry */
#define AFS_VL_CURSOR_RETRIED 0x0004 /* Set if started a retry */
unsigned short nr_iterations; /* Number of server iterations */
};
/*
* Fileserver operation methods.
*/
struct afs_operation_ops {
void (*issue_afs_rpc)(struct afs_operation *op);
void (*issue_yfs_rpc)(struct afs_operation *op);
void (*success)(struct afs_operation *op);
void (*aborted)(struct afs_operation *op);
void (*failed)(struct afs_operation *op);
void (*edit_dir)(struct afs_operation *op);
void (*put)(struct afs_operation *op);
};
struct afs_vnode_param {
struct afs_vnode *vnode;
struct afs_fid fid; /* Fid to access */
struct afs_status_cb scb; /* Returned status and callback promise */
afs_dataversion_t dv_before; /* Data version before the call */
unsigned int cb_break_before; /* cb_break + cb_s_break before the call */
u8 dv_delta; /* Expected change in data version */
bool put_vnode:1; /* T if we have a ref on the vnode */
bool need_io_lock:1; /* T if we need the I/O lock on this */
bool update_ctime:1; /* Need to update the ctime */
bool set_size:1; /* Must update i_size */
bool op_unlinked:1; /* True if file was unlinked by op */
bool speculative:1; /* T if speculative status fetch (no vnode lock) */
bool modification:1; /* Set if the content gets modified */
};
/*
* Fileserver operation wrapper, handling server and address rotation
* asynchronously. May make simultaneous calls to multiple servers.
*/
struct afs_operation {
struct afs_net *net; /* Network namespace */
struct key *key; /* Key for the cell */
const struct afs_call_type *type; /* Type of call done */
const struct afs_operation_ops *ops;
/* Parameters/results for the operation */
struct afs_volume *volume; /* Volume being accessed */
struct afs_vnode_param file[2];
struct afs_vnode_param *more_files;
struct afs_volsync volsync;
struct dentry *dentry; /* Dentry to be altered */
struct dentry *dentry_2; /* Second dentry to be altered */
struct timespec64 mtime; /* Modification time to record */
struct timespec64 ctime; /* Change time to set */
short nr_files; /* Number of entries in file[], more_files */
short error;
unsigned int debug_id;
unsigned int cb_v_break; /* Volume break counter before op */
unsigned int cb_s_break; /* Server break counter before op */
union {
struct {
int which; /* Which ->file[] to fetch for */
} fetch_status;
struct {
int reason; /* enum afs_edit_dir_reason */
mode_t mode;
const char *symlink;
} create;
struct {
bool need_rehash;
} unlink;
struct {
struct dentry *rehash;
struct dentry *tmp;
bool new_negative;
} rename;
struct {
struct afs_read *req;
} fetch;
struct {
afs_lock_type_t type;
} lock;
struct {
struct iov_iter *write_iter;
loff_t pos;
loff_t size;
loff_t i_size;
bool laundering; /* Laundering page, PG_writeback not set */
} store;
struct {
struct iattr *attr;
loff_t old_i_size;
} setattr;
struct afs_acl *acl;
struct yfs_acl *yacl;
struct {
struct afs_volume_status vs;
struct kstatfs *buf;
} volstatus;
};
/* Fileserver iteration state */
struct afs_addr_cursor ac;
struct afs_server_list *server_list; /* Current server list (pins ref) */
struct afs_server *server; /* Server we're using (ref pinned by server_list) */
struct afs_call *call;
unsigned long untried; /* Bitmask of untried servers */
short index; /* Current server */
unsigned short nr_iterations; /* Number of server iterations */
unsigned int flags;
#define AFS_OPERATION_STOP 0x0001 /* Set to cease iteration */
#define AFS_OPERATION_VBUSY 0x0002 /* Set if seen VBUSY */
#define AFS_OPERATION_VMOVED 0x0004 /* Set if seen VMOVED */
#define AFS_OPERATION_VNOVOL 0x0008 /* Set if seen VNOVOL */
#define AFS_OPERATION_CUR_ONLY 0x0010 /* Set if current server only (file lock held) */
#define AFS_OPERATION_NO_VSLEEP 0x0020 /* Set to prevent sleep on VBUSY, VOFFLINE, ... */
#define AFS_OPERATION_UNINTR 0x0040 /* Set if op is uninterruptible */
#define AFS_OPERATION_DOWNGRADE 0x0080 /* Set to retry with downgraded opcode */
#define AFS_OPERATION_LOCK_0 0x0100 /* Set if have io_lock on file[0] */
#define AFS_OPERATION_LOCK_1 0x0200 /* Set if have io_lock on file[1] */
#define AFS_OPERATION_TRIED_ALL 0x0400 /* Set if we've tried all the fileservers */
#define AFS_OPERATION_RETRY_SERVER 0x0800 /* Set if we should retry the current server */
#define AFS_OPERATION_DIR_CONFLICT 0x1000 /* Set if we detected a 3rd-party dir change */
};
/*
* Cache auxiliary data.
*/
struct afs_vnode_cache_aux {
__be64 data_version;
} __packed;
static inline void afs_set_cache_aux(struct afs_vnode *vnode,
struct afs_vnode_cache_aux *aux)
{
aux->data_version = cpu_to_be64(vnode->status.data_version);
}
static inline void afs_invalidate_cache(struct afs_vnode *vnode, unsigned int flags)
{
struct afs_vnode_cache_aux aux;
afs_set_cache_aux(vnode, &aux);
fscache_invalidate(afs_vnode_cache(vnode), &aux,
i_size_read(&vnode->netfs.inode), flags);
}
/*
* We use folio->private to hold the amount of the folio that we've written to,
* splitting the field into two parts. However, we need to represent a range
* 0...FOLIO_SIZE, so we reduce the resolution if the size of the folio
* exceeds what we can encode.
*/
#ifdef CONFIG_64BIT
#define __AFS_FOLIO_PRIV_MASK 0x7fffffffUL
#define __AFS_FOLIO_PRIV_SHIFT 32
#define __AFS_FOLIO_PRIV_MMAPPED 0x80000000UL
#else
#define __AFS_FOLIO_PRIV_MASK 0x7fffUL
#define __AFS_FOLIO_PRIV_SHIFT 16
#define __AFS_FOLIO_PRIV_MMAPPED 0x8000UL
#endif
static inline unsigned int afs_folio_dirty_resolution(struct folio *folio)
{
int shift = folio_shift(folio) - (__AFS_FOLIO_PRIV_SHIFT - 1);
return (shift > 0) ? shift : 0;
}
static inline size_t afs_folio_dirty_from(struct folio *folio, unsigned long priv)
{
unsigned long x = priv & __AFS_FOLIO_PRIV_MASK;
/* The lower bound is inclusive */
return x << afs_folio_dirty_resolution(folio);
}
static inline size_t afs_folio_dirty_to(struct folio *folio, unsigned long priv)
{
unsigned long x = (priv >> __AFS_FOLIO_PRIV_SHIFT) & __AFS_FOLIO_PRIV_MASK;
/* The upper bound is immediately beyond the region */
return (x + 1) << afs_folio_dirty_resolution(folio);
}
static inline unsigned long afs_folio_dirty(struct folio *folio, size_t from, size_t to)
{
unsigned int res = afs_folio_dirty_resolution(folio);
from >>= res;
to = (to - 1) >> res;
return (to << __AFS_FOLIO_PRIV_SHIFT) | from;
}
static inline unsigned long afs_folio_dirty_mmapped(unsigned long priv)
{
return priv | __AFS_FOLIO_PRIV_MMAPPED;
}
static inline bool afs_is_folio_dirty_mmapped(unsigned long priv)
{
return priv & __AFS_FOLIO_PRIV_MMAPPED;
}
#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_vlserver_list *afs_parse_text_addrs(struct afs_net *,
const char *, size_t, char,
unsigned short, unsigned short);
extern struct afs_vlserver_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 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;
#endif
/*
* callback.c
*/
extern void afs_invalidate_mmap_work(struct work_struct *);
extern void afs_server_init_callback_work(struct work_struct *work);
extern void afs_init_callback_state(struct afs_server *);
extern void __afs_break_callback(struct afs_vnode *, enum afs_cb_break_reason);
extern void afs_break_callback(struct afs_vnode *, enum afs_cb_break_reason);
extern void afs_break_callbacks(struct afs_server *, size_t, struct afs_callback_break *);
static inline unsigned int afs_calc_vnode_cb_break(struct afs_vnode *vnode)
{
return vnode->cb_break + vnode->cb_v_break;
}
static inline bool afs_cb_is_broken(unsigned int cb_break,
const struct afs_vnode *vnode)
{
return cb_break != (vnode->cb_break + vnode->volume->cb_v_break);
}
/*
* cell.c
*/
extern int afs_cell_init(struct afs_net *, const char *);
extern struct afs_cell *afs_find_cell(struct afs_net *, const char *, unsigned,
enum afs_cell_trace);
extern struct afs_cell *afs_lookup_cell(struct afs_net *, const char *, unsigned,
const char *, bool);
extern struct afs_cell *afs_use_cell(struct afs_cell *, enum afs_cell_trace);
extern void afs_unuse_cell(struct afs_net *, struct afs_cell *, enum afs_cell_trace);
extern struct afs_cell *afs_get_cell(struct afs_cell *, enum afs_cell_trace);
extern void afs_see_cell(struct afs_cell *, enum afs_cell_trace);
extern void afs_put_cell(struct afs_cell *, enum afs_cell_trace);
extern void afs_queue_cell(struct afs_cell *, enum afs_cell_trace);
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 *);
extern void afs_check_for_remote_deletion(struct afs_operation *);
/*
* 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);
/*
* dir_silly.c
*/
extern int afs_sillyrename(struct afs_vnode *, struct afs_vnode *,
struct dentry *, struct key *);
extern int afs_silly_iput(struct dentry *, struct inode *);
/*
* dynroot.c
*/
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 *);
extern int afs_dynroot_mkdir(struct afs_net *, struct afs_cell *);
extern void afs_dynroot_rmdir(struct afs_net *, struct afs_cell *);
extern int afs_dynroot_populate(struct super_block *);
extern void afs_dynroot_depopulate(struct super_block *);
/*
* file.c
*/
extern const struct address_space_operations afs_file_aops;
extern const struct address_space_operations afs_symlink_aops;
extern const struct inode_operations afs_file_inode_operations;
extern const struct file_operations afs_file_operations;
extern const struct netfs_request_ops afs_req_ops;
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 afs_read *);
extern struct afs_read *afs_alloc_read(gfp_t);
extern void afs_put_read(struct afs_read *);
extern int afs_write_inode(struct inode *, struct writeback_control *);
static inline struct afs_read *afs_get_read(struct afs_read *req)
{
refcount_inc(&req->usage);
return req;
}
/*
* flock.c
*/
extern struct workqueue_struct *afs_lock_manager;
extern void afs_lock_op_done(struct afs_call *);
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 void afs_fs_fetch_status(struct afs_operation *);
extern void afs_fs_fetch_data(struct afs_operation *);
extern void afs_fs_create_file(struct afs_operation *);
extern void afs_fs_make_dir(struct afs_operation *);
extern void afs_fs_remove_file(struct afs_operation *);
extern void afs_fs_remove_dir(struct afs_operation *);
extern void afs_fs_link(struct afs_operation *);
extern void afs_fs_symlink(struct afs_operation *);
extern void afs_fs_rename(struct afs_operation *);
extern void afs_fs_store_data(struct afs_operation *);
extern void afs_fs_setattr(struct afs_operation *);
extern void afs_fs_get_volume_status(struct afs_operation *);
extern void afs_fs_set_lock(struct afs_operation *);
extern void afs_fs_extend_lock(struct afs_operation *);
extern void afs_fs_release_lock(struct afs_operation *);
extern int afs_fs_give_up_all_callbacks(struct afs_net *, struct afs_server *,
struct afs_addr_cursor *, struct key *);
extern bool afs_fs_get_capabilities(struct afs_net *, struct afs_server *,
struct afs_addr_cursor *, struct key *);
extern void afs_fs_inline_bulk_status(struct afs_operation *);
struct afs_acl {
u32 size;
u8 data[];
};
extern void afs_fs_fetch_acl(struct afs_operation *);
extern void afs_fs_store_acl(struct afs_operation *);
/*
* fs_operation.c
*/
extern struct afs_operation *afs_alloc_operation(struct key *, struct afs_volume *);
extern int afs_put_operation(struct afs_operation *);
extern bool afs_begin_vnode_operation(struct afs_operation *);
extern void afs_wait_for_operation(struct afs_operation *);
extern int afs_do_sync_operation(struct afs_operation *);
static inline void afs_op_nomem(struct afs_operation *op)
{
op->error = -ENOMEM;
}
static inline void afs_op_set_vnode(struct afs_operation *op, unsigned int n,
struct afs_vnode *vnode)
{
op->file[n].vnode = vnode;
op->file[n].need_io_lock = true;
}
static inline void afs_op_set_fid(struct afs_operation *op, unsigned int n,
const struct afs_fid *fid)
{
op->file[n].fid = *fid;
}
/*
* fs_probe.c
*/
extern void afs_fileserver_probe_result(struct afs_call *);
extern void afs_fs_probe_fileserver(struct afs_net *, struct afs_server *, struct key *, bool);
extern int afs_wait_for_fs_probes(struct afs_server_list *, unsigned long);
extern void afs_probe_fileserver(struct afs_net *, struct afs_server *);
extern void afs_fs_probe_dispatcher(struct work_struct *);
extern int afs_wait_for_one_fs_probe(struct afs_server *, bool);
extern void afs_fs_probe_cleanup(struct afs_net *);
/*
* inode.c
*/
extern const struct afs_operation_ops afs_fetch_status_operation;
extern void afs_vnode_commit_status(struct afs_operation *, struct afs_vnode_param *);
extern int afs_fetch_status(struct afs_vnode *, struct key *, bool, afs_access_t *);
extern int afs_ilookup5_test_by_fid(struct inode *, void *);
extern struct inode *afs_iget_pseudo_dir(struct super_block *, bool);
extern struct inode *afs_iget(struct afs_operation *, struct afs_vnode_param *);
extern struct inode *afs_root_iget(struct super_block *, struct key *);
extern bool afs_check_validity(struct afs_vnode *);
extern int afs_validate(struct afs_vnode *, struct key *);
extern int afs_getattr(struct user_namespace *mnt_userns, const struct path *,
struct kstat *, u32, unsigned int);
extern int afs_setattr(struct user_namespace *mnt_userns, 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->netfs.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);
extern void afs_prioritise_error(struct afs_error *, int, 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);
/*
* 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_select_fileserver(struct afs_operation *);
extern void afs_dump_edestaddrreq(const struct afs_operation *);
/*
* 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 void afs_make_call(struct afs_addr_cursor *, struct afs_call *, gfp_t);
extern long afs_wait_for_call_to_complete(struct afs_call *, struct afs_addr_cursor *);
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 *, bool);
extern int afs_protocol_error(struct afs_call *, enum afs_eproto_cause);
static inline void afs_make_op_call(struct afs_operation *op, struct afs_call *call,
gfp_t gfp)
{
op->call = call;
op->type = call->type;
call->op = op;
call->key = op->key;
call->intr = !(op->flags & AFS_OPERATION_UNINTR);
afs_make_call(&op->ac, call, gfp);
}
static inline void afs_extract_begin(struct afs_call *call, void *buf, size_t size)
{
call->iov_len = size;
call->kvec[0].iov_base = buf;
call->kvec[0].iov_len = size;
iov_iter_kvec(&call->def_iter, READ, call->kvec, 1, size);
}
static inline void afs_extract_to_tmp(struct afs_call *call)
{
call->iov_len = sizeof(call->tmp);
afs_extract_begin(call, &call->tmp, sizeof(call->tmp));
}
static inline void afs_extract_to_tmp64(struct afs_call *call)
{
call->iov_len = sizeof(call->tmp64);
afs_extract_begin(call, &call->tmp64, sizeof(call->tmp64));
}
static inline void afs_extract_discard(struct afs_call *call, size_t size)
{
call->iov_len = size;
iov_iter_discard(&call->def_iter, READ, size);
}
static inline void afs_extract_to_buf(struct afs_call *call, size_t size)
{
call->iov_len = size;
afs_extract_begin(call, call->buffer, size);
}
static inline int afs_transfer_reply(struct afs_call *call)
{
return afs_extract_data(call, 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);
/* Asynchronous calls have two refs to release - one from the alloc and
* one queued with the work item - and we can't just deallocate the
* call because the work item may be queued again.
*/
if (call->drop_ref)
afs_put_call(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,
struct afs_status_cb *);
extern void afs_zap_permits(struct rcu_head *);
extern struct key *afs_request_key(struct afs_cell *);
extern struct key *afs_request_key_rcu(struct afs_cell *);
extern int afs_check_permit(struct afs_vnode *, struct key *, afs_access_t *);
extern int afs_permission(struct user_namespace *, struct inode *, int);
extern void __exit afs_clean_up_permit_cache(void);
/*
* server.c
*/
extern spinlock_t afs_server_peer_lock;
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 *, u32);
extern struct afs_server *afs_get_server(struct afs_server *, enum afs_server_trace);
extern struct afs_server *afs_use_server(struct afs_server *, enum afs_server_trace);
extern void afs_unuse_server(struct afs_net *, struct afs_server *, enum afs_server_trace);
extern void afs_unuse_server_notime(struct afs_net *, struct afs_server *, enum afs_server_trace);
extern void afs_put_server(struct afs_net *, struct afs_server *, enum afs_server_trace);
extern void afs_manage_servers(struct work_struct *);
extern void afs_servers_timer(struct timer_list *);
extern void afs_fs_probe_timer(struct timer_list *);
extern void __net_exit afs_purge_servers(struct afs_net *);
extern bool afs_check_server_record(struct afs_operation *, struct afs_server *);
static inline void afs_inc_servers_outstanding(struct afs_net *net)
{
atomic_inc(&net->servers_outstanding);
}
static inline void afs_dec_servers_outstanding(struct afs_net *net)
{
if (atomic_dec_and_test(&net->servers_outstanding))
wake_up_var(&net->servers_outstanding);
}
static inline bool afs_is_probing_server(struct afs_server *server)
{
return list_empty(&server->probe_link);
}
/*
* 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_vl_cursor *,
const char *, int);
extern struct afs_addr_list *afs_vl_get_addrs_u(struct afs_vl_cursor *, const uuid_t *);
extern struct afs_call *afs_vl_get_capabilities(struct afs_net *, struct afs_addr_cursor *,
struct key *, struct afs_vlserver *, unsigned int);
extern struct afs_addr_list *afs_yfsvl_get_endpoints(struct afs_vl_cursor *, const uuid_t *);
extern char *afs_yfsvl_get_cell_name(struct afs_vl_cursor *);
/*
* vl_alias.c
*/
extern int afs_cell_detect_alias(struct afs_cell *, struct key *);
/*
* vl_probe.c
*/
extern void afs_vlserver_probe_result(struct afs_call *);
extern int afs_send_vl_probes(struct afs_net *, struct key *, struct afs_vlserver_list *);
extern int afs_wait_for_vl_probes(struct afs_vlserver_list *, unsigned long);
/*
* vl_rotate.c
*/
extern bool afs_begin_vlserver_operation(struct afs_vl_cursor *,
struct afs_cell *, struct key *);
extern bool afs_select_vlserver(struct afs_vl_cursor *);
extern bool afs_select_current_vlserver(struct afs_vl_cursor *);
extern int afs_end_vlserver_operation(struct afs_vl_cursor *);
/*
* vlserver_list.c
*/
static inline struct afs_vlserver *afs_get_vlserver(struct afs_vlserver *vlserver)
{
refcount_inc(&vlserver->ref);
return vlserver;
}
static inline struct afs_vlserver_list *afs_get_vlserverlist(struct afs_vlserver_list *vllist)
{
if (vllist)
refcount_inc(&vllist->ref);
return vllist;
}
extern struct afs_vlserver *afs_alloc_vlserver(const char *, size_t, unsigned short);
extern void afs_put_vlserver(struct afs_net *, struct afs_vlserver *);
extern struct afs_vlserver_list *afs_alloc_vlserver_list(unsigned int);
extern void afs_put_vlserverlist(struct afs_net *, struct afs_vlserver_list *);
extern struct afs_vlserver_list *afs_extract_vlserver_list(struct afs_cell *,
const void *, size_t);
/*
* volume.c
*/
extern struct afs_volume *afs_create_volume(struct afs_fs_context *);
extern int afs_activate_volume(struct afs_volume *);
extern void afs_deactivate_volume(struct afs_volume *);
extern struct afs_volume *afs_get_volume(struct afs_volume *, enum afs_volume_trace);
extern void afs_put_volume(struct afs_net *, struct afs_volume *, enum afs_volume_trace);
extern int afs_check_volume_status(struct afs_volume *, struct afs_operation *);
/*
* write.c
*/
#ifdef CONFIG_AFS_FSCACHE
bool afs_dirty_folio(struct address_space *, struct folio *);
#else
#define afs_dirty_folio filemap_dirty_folio
#endif
extern int afs_write_begin(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len,
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 ssize_t afs_file_write(struct kiocb *, struct iov_iter *);
extern int afs_fsync(struct file *, loff_t, loff_t, int);
extern vm_fault_t afs_page_mkwrite(struct vm_fault *vmf);
extern void afs_prune_wb_keys(struct afs_vnode *);
int afs_launder_folio(struct folio *);
/*
* xattr.c
*/
extern const struct xattr_handler *afs_xattr_handlers[];
/*
* yfsclient.c
*/
extern void yfs_fs_fetch_data(struct afs_operation *);
extern void yfs_fs_create_file(struct afs_operation *);
extern void yfs_fs_make_dir(struct afs_operation *);
extern void yfs_fs_remove_file2(struct afs_operation *);
extern void yfs_fs_remove_file(struct afs_operation *);
extern void yfs_fs_remove_dir(struct afs_operation *);
extern void yfs_fs_link(struct afs_operation *);
extern void yfs_fs_symlink(struct afs_operation *);
extern void yfs_fs_rename(struct afs_operation *);
extern void yfs_fs_store_data(struct afs_operation *);
extern void yfs_fs_setattr(struct afs_operation *);
extern void yfs_fs_get_volume_status(struct afs_operation *);
extern void yfs_fs_set_lock(struct afs_operation *);
extern void yfs_fs_extend_lock(struct afs_operation *);
extern void yfs_fs_release_lock(struct afs_operation *);
extern void yfs_fs_fetch_status(struct afs_operation *);
extern void yfs_fs_inline_bulk_status(struct afs_operation *);
struct yfs_acl {
struct afs_acl *acl; /* Dir/file/symlink ACL */
struct afs_acl *vol_acl; /* Whole volume ACL */
u32 inherit_flag; /* True if ACL is inherited from parent dir */
u32 num_cleaned; /* Number of ACEs removed due to subject removal */
unsigned int flags;
#define YFS_ACL_WANT_ACL 0x01 /* Set if caller wants ->acl */
#define YFS_ACL_WANT_VOL_ACL 0x02 /* Set if caller wants ->vol_acl */
};
extern void yfs_free_opaque_acl(struct yfs_acl *);
extern void yfs_fs_fetch_opaque_acl(struct afs_operation *);
extern void yfs_fs_store_opaque_acl2(struct afs_operation *);
/*
* Miscellaneous inline functions.
*/
static inline struct afs_vnode *AFS_FS_I(struct inode *inode)
{
return container_of(inode, struct afs_vnode, netfs.inode);
}
static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode)
{
return &vnode->netfs.inode;
}
/*
* Note that a dentry got changed. We need to set d_fsdata to the data version
* number derived from the result of the operation. It doesn't matter if
* d_fsdata goes backwards as we'll just revalidate.
*/
static inline void afs_update_dentry_version(struct afs_operation *op,
struct afs_vnode_param *dir_vp,
struct dentry *dentry)
{
if (!op->error)
dentry->d_fsdata =
(void *)(unsigned long)dir_vp->scb.status.data_version;
}
/*
* Set the file size and block count. Estimate the number of 512 bytes blocks
* used, rounded up to nearest 1K for consistency with other AFS clients.
*/
static inline void afs_set_i_size(struct afs_vnode *vnode, u64 size)
{
i_size_write(&vnode->netfs.inode, size);
vnode->netfs.inode.i_blocks = ((size + 1023) >> 10) << 1;
}
/*
* Check for a conflicting operation on a directory that we just unlinked from.
* If someone managed to sneak a link or an unlink in on the file we just
* unlinked, we won't be able to trust nlink on an AFS file (but not YFS).
*/
static inline void afs_check_dir_conflict(struct afs_operation *op,
struct afs_vnode_param *dvp)
{
if (dvp->dv_before + dvp->dv_delta != dvp->scb.status.data_version)
op->flags |= AFS_OPERATION_DIR_CONFLICT;
}
static inline int afs_io_error(struct afs_call *call, enum afs_io_error where)
{
trace_afs_io_error(call->debug_id, -EIO, where);
return -EIO;
}
static inline int afs_bad(struct afs_vnode *vnode, enum afs_file_error where)
{
trace_afs_file_error(vnode, -EIO, where);
return -EIO;
}
/*****************************************************************************/
/*
* 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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