source: mainline/uspace/srv/vfs/vfs.h@ bf9dc4e2

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since bf9dc4e2 was bf9dc4e2, checked in by Jiri Zarevucky <zarevucky.jiri@…>, 12 years ago

Relativize and simplify lookup().
  • Property mode set to 100644
File size: 6.8 KB
Line 
1/*
2 * Copyright (c) 2008 Jakub Jermar
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * - The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29/** @addtogroup fs
30 * @{
31 */
32
33#ifndef VFS_VFS_H_
34#define VFS_VFS_H_
35
36#include <async.h>
37#include <adt/list.h>
38#include <adt/hash_table.h>
39#include <fibril_synch.h>
40#include <sys/types.h>
41#include <loc.h>
42#include <stdbool.h>
43#include <ipc/vfs.h>
44#include <task.h>
45
46#ifndef dprintf
47 #define dprintf(...)
48#endif
49
50/**
51 * A structure like this will be allocated for each registered file system.
52 */
53typedef struct {
54 link_t fs_link;
55 vfs_info_t vfs_info;
56 fs_handle_t fs_handle;
57 async_sess_t *sess;
58} fs_info_t;
59
60/**
61 * VFS_PAIR uniquely represents a file system instance.
62 */
63#define VFS_PAIR \
64 fs_handle_t fs_handle; \
65 service_id_t service_id;
66
67/**
68 * VFS_TRIPLET uniquely identifies a file system node (e.g. directory, file) but
69 * doesn't contain any state. For a stateful structure, see vfs_node_t.
70 *
71 * @note fs_handle, service_id and index are meant to be returned in one
72 * IPC reply.
73 */
74#define VFS_TRIPLET \
75 VFS_PAIR; \
76 fs_index_t index;
77
78typedef struct {
79 VFS_PAIR;
80} vfs_pair_t;
81
82typedef struct {
83 VFS_TRIPLET;
84} vfs_triplet_t;
85
86typedef enum vfs_node_type {
87 VFS_NODE_UNKNOWN,
88 VFS_NODE_FILE,
89 VFS_NODE_DIRECTORY,
90} vfs_node_type_t;
91
92typedef struct {
93 vfs_triplet_t triplet;
94 vfs_node_type_t type;
95 aoff64_t size;
96 unsigned int lnkcnt;
97} vfs_lookup_res_t;
98
99/**
100 * Instances of this type represent an active, in-memory VFS node and any state
101 * which may be associated with it.
102 */
103typedef struct {
104 VFS_TRIPLET; /**< Identity of the node. */
105
106 /**
107 * Usage counter. This includes, but is not limited to, all vfs_file_t
108 * structures that reference this node.
109 */
110 unsigned refcnt;
111
112 /** Number of names this node has in the file system namespace. */
113 unsigned lnkcnt;
114
115 ht_link_t nh_link; /**< Node hash-table link. */
116
117 vfs_node_type_t type; /**< Partial info about the node type. */
118
119 aoff64_t size; /**< Cached size if the node is a file. */
120
121 /**
122 * Holding this rwlock prevents modifications of the node's contents.
123 */
124 fibril_rwlock_t contents_rwlock;
125} vfs_node_t;
126
127/**
128 * Instances of this type represent an open file. If the file is opened by more
129 * than one task, there will be a separate structure allocated for each task.
130 */
131typedef struct {
132 /** Serializes access to this open file. */
133 fibril_mutex_t lock;
134
135 vfs_node_t *node;
136
137 /** Number of file handles referencing this file. */
138 unsigned refcnt;
139
140 int permissions;
141 bool open_read;
142 bool open_write;
143
144 /** Append on write. */
145 bool append;
146
147 /** Current absolute position in the file. */
148 aoff64_t pos;
149} vfs_file_t;
150
151extern fibril_mutex_t nodes_mutex;
152
153extern fibril_condvar_t fs_list_cv;
154extern fibril_mutex_t fs_list_lock;
155extern list_t fs_list; /**< List of registered file systems. */
156
157extern fibril_mutex_t fs_mntlist_lock;
158extern list_t fs_mntlist; /**< List of mounted file systems. */
159
160extern vfs_pair_t rootfs; /**< Root file system. */
161
162/** Each instance of this type describes one path lookup in progress. */
163typedef struct {
164 link_t plb_link; /**< Active PLB entries list link. */
165 unsigned index; /**< Index of the first character in PLB. */
166 size_t len; /**< Number of characters in this PLB entry. */
167} plb_entry_t;
168
169extern fibril_mutex_t plb_mutex;/**< Mutex protecting plb and plb_entries. */
170extern uint8_t *plb; /**< Path Lookup Buffer */
171extern list_t plb_entries; /**< List of active PLB entries. */
172
173/** Holding this rwlock prevents changes in file system namespace. */
174extern fibril_rwlock_t namespace_rwlock;
175
176extern async_exch_t *vfs_exchange_grab(fs_handle_t);
177extern void vfs_exchange_release(async_exch_t *);
178
179extern fs_handle_t fs_name_to_handle(unsigned int instance, char *, bool);
180extern vfs_info_t *fs_handle_to_info(fs_handle_t);
181
182extern int vfs_lookup_internal(vfs_triplet_t *, char *, int, vfs_lookup_res_t *);
183extern int vfs_link_internal(vfs_triplet_t *, char *, vfs_triplet_t *);
184
185extern bool vfs_nodes_init(void);
186extern vfs_node_t *vfs_node_get(vfs_lookup_res_t *);
187extern void vfs_node_put(vfs_node_t *);
188extern void vfs_node_forget(vfs_node_t *);
189extern unsigned vfs_nodes_refcount_sum_get(fs_handle_t, service_id_t);
190
191
192#define MAX_OPEN_FILES 128
193
194extern void *vfs_client_data_create(void);
195extern void vfs_client_data_destroy(void *);
196
197extern void vfs_pass_handle(task_id_t, task_id_t, int);
198extern int vfs_wait_handle_internal(void);
199
200extern vfs_file_t *vfs_file_get(int);
201extern void vfs_file_put(vfs_file_t *);
202extern int vfs_fd_assign(vfs_file_t *, int);
203extern int vfs_fd_alloc(bool desc);
204extern int vfs_fd_free(int);
205
206extern void vfs_node_addref(vfs_node_t *);
207extern void vfs_node_delref(vfs_node_t *);
208extern int vfs_open_node_remote(vfs_node_t *);
209
210extern void vfs_register(ipc_callid_t, ipc_call_t *);
211extern void vfs_mount(ipc_callid_t, ipc_call_t *);
212extern void vfs_unmount(ipc_callid_t, ipc_call_t *);
213extern void vfs_sync(ipc_callid_t, ipc_call_t *);
214extern void vfs_dup(ipc_callid_t, ipc_call_t *);
215extern void vfs_close(ipc_callid_t, ipc_call_t *);
216extern void vfs_read(ipc_callid_t, ipc_call_t *);
217extern void vfs_write(ipc_callid_t, ipc_call_t *);
218extern void vfs_seek(ipc_callid_t, ipc_call_t *);
219extern void vfs_truncate(ipc_callid_t, ipc_call_t *);
220extern void vfs_fstat(ipc_callid_t, ipc_call_t *);
221extern void vfs_rename(ipc_callid_t, ipc_call_t *);
222extern void vfs_wait_handle(ipc_callid_t, ipc_call_t *);
223extern void vfs_get_mtab(ipc_callid_t, ipc_call_t *);
224
225extern void vfs_walk(ipc_callid_t, ipc_call_t *);
226extern void vfs_open2(ipc_callid_t, ipc_call_t *);
227extern void vfs_unlink2(ipc_callid_t, ipc_call_t *);
228
229#endif
230
231/**
232 * @}
233 */
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