source: mainline/uspace/srv/vfs/vfs.h@ 58898d1d

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 58898d1d was 58898d1d, checked in by Jakub Jermar <jakub@…>, 8 years ago

Remove VFS_IN_SEEK from VFS
  • Property mode set to 100644
File size: 7.2 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} vfs_lookup_res_t;
97
98/**
99 * Instances of this type represent an active, in-memory VFS node and any state
100 * which may be associated with it.
101 */
102typedef struct _vfs_node {
103 VFS_TRIPLET; /**< Identity of the node. */
104
105 /**
106 * Usage counter. This includes, but is not limited to, all vfs_file_t
107 * structures that reference this node.
108 */
109 unsigned refcnt;
110
111 ht_link_t nh_link; /**< Node hash-table link. */
112
113 vfs_node_type_t type; /**< Partial info about the node type. */
114
115 int64_t size; /**< Cached size if the node is a file. */
116
117 /**
118 * Holding this rwlock prevents modifications of the node's contents.
119 */
120 fibril_rwlock_t contents_rwlock;
121
122 struct _vfs_node *mount;
123} vfs_node_t;
124
125/**
126 * Instances of this type represent an open file. If the file is opened by more
127 * than one task, there will be a separate structure allocated for each task.
128 */
129typedef struct {
130 /** Serializes access to this open file. */
131 fibril_mutex_t _lock;
132
133 vfs_node_t *node;
134
135 /** Number of file handles referencing this file. */
136 unsigned refcnt;
137
138 int permissions;
139 bool open_read;
140 bool open_write;
141
142 /** Append on write. */
143 bool append;
144} vfs_file_t;
145
146extern fibril_mutex_t nodes_mutex;
147
148extern fibril_condvar_t fs_list_cv;
149extern fibril_mutex_t fs_list_lock;
150extern list_t fs_list; /**< List of registered file systems. */
151
152extern fibril_mutex_t fs_mntlist_lock;
153extern list_t fs_mntlist; /**< List of mounted file systems. */
154
155extern vfs_pair_t rootfs; /**< Root file system. */
156
157/** Each instance of this type describes one path lookup in progress. */
158typedef struct {
159 link_t plb_link; /**< Active PLB entries list link. */
160 unsigned index; /**< Index of the first character in PLB. */
161 size_t len; /**< Number of characters in this PLB entry. */
162} plb_entry_t;
163
164extern fibril_mutex_t plb_mutex;/**< Mutex protecting plb and plb_entries. */
165extern uint8_t *plb; /**< Path Lookup Buffer */
166extern list_t plb_entries; /**< List of active PLB entries. */
167
168/** Holding this rwlock prevents changes in file system namespace. */
169extern fibril_rwlock_t namespace_rwlock;
170
171extern async_exch_t *vfs_exchange_grab(fs_handle_t);
172extern void vfs_exchange_release(async_exch_t *);
173
174extern fs_handle_t fs_name_to_handle(unsigned int instance, const char *, bool);
175extern vfs_info_t *fs_handle_to_info(fs_handle_t);
176
177extern int vfs_lookup_internal(vfs_node_t *, char *, int, vfs_lookup_res_t *);
178extern int vfs_link_internal(vfs_node_t *, char *, vfs_triplet_t *);
179
180extern bool vfs_nodes_init(void);
181extern vfs_node_t *vfs_node_get(vfs_lookup_res_t *);
182extern vfs_node_t *vfs_node_peek(vfs_lookup_res_t *result);
183extern void vfs_node_put(vfs_node_t *);
184extern void vfs_node_forget(vfs_node_t *);
185extern unsigned vfs_nodes_refcount_sum_get(fs_handle_t, service_id_t);
186
187extern int64_t vfs_node_get_size(vfs_node_t *node);
188extern bool vfs_node_has_children(vfs_node_t *node);
189
190extern void *vfs_client_data_create(void);
191extern void vfs_client_data_destroy(void *);
192
193extern void vfs_op_pass_handle(task_id_t, task_id_t, int);
194extern int vfs_wait_handle_internal(bool);
195
196extern vfs_file_t *vfs_file_get(int);
197extern void vfs_file_put(vfs_file_t *);
198extern int vfs_fd_assign(vfs_file_t *, int);
199extern int vfs_fd_alloc(vfs_file_t **file, bool desc);
200extern int vfs_fd_free(int);
201
202extern void vfs_node_addref(vfs_node_t *);
203extern void vfs_node_delref(vfs_node_t *);
204extern int vfs_open_node_remote(vfs_node_t *);
205
206extern int vfs_op_clone(int oldfd, bool desc);
207extern int vfs_op_close(int fd);
208extern int vfs_op_dup(int oldfd, int newfd);
209extern int vfs_op_fstat(int fd);
210extern int vfs_op_mount(int mpfd, unsigned servid, unsigned flags, unsigned instance, const char *opts, const char *fsname, int *outfd);
211extern int vfs_op_mtab_get(void);
212extern int vfs_op_open2(int fd, int flags);
213extern int vfs_op_read(int fd, aoff64_t, size_t *out_bytes);
214extern int vfs_op_rename(int basefd, char *old, char *new);
215extern int vfs_op_statfs(int fd);
216extern int vfs_op_sync(int fd);
217extern int vfs_op_truncate(int fd, int64_t size);
218extern int vfs_op_unlink2(int parentfd, int expectfd, int wflag, char *path);
219extern int vfs_op_unmount(int mpfd);
220extern int vfs_op_wait_handle(bool high_fd);
221extern int vfs_op_walk(int parentfd, int flags, char *path, int *out_fd);
222extern int vfs_op_write(int fd, aoff64_t, size_t *out_bytes);
223
224extern void vfs_register(ipc_callid_t, ipc_call_t *);
225
226extern void vfs_page_in(ipc_callid_t, ipc_call_t *);
227
228typedef struct {
229 void *buffer;
230 size_t size;
231} rdwr_io_chunk_t;
232
233extern int vfs_rdwr_internal(int, aoff64_t, bool, rdwr_io_chunk_t *);
234
235extern void vfs_connection(ipc_callid_t iid, ipc_call_t *icall, void *arg);
236
237#endif
238
239/**
240 * @}
241 */
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