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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/filelock.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 in secs 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 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 issue_time; /* Time of issue of operation */
+};
+
+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 {
+ struct rcu_head rcu;
+ 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 */
+#define AFS_VOLUME_RM_TREE 7 /* - Set if volume removed from cell->volumes */
+#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;
+ if (cookie)
+ mapping_set_release_always(vnode->netfs.inode.i_mapping);
+#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);
+
+/*
+ * 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 *);
+bool afs_pagecache_valid(struct afs_vnode *);
+extern int afs_getattr(struct mnt_idmap *idmap, const struct path *,
+ struct kstat *, u32, unsigned int);
+extern int afs_setattr(struct mnt_idmap *idmap, 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, ITER_DEST, 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, ITER_DEST, 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 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 mnt_idmap *, 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 *);
+bool afs_try_get_volume(struct afs_volume *volume, enum afs_volume_trace reason);
+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 */