WebSVN – HelenOS – Diff – /trunk/uspace/srv/vfs/vfs.h


/*
 * Copyright (c) 2008 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
/** @addtogroup fs
 * @{
 */
 
#ifndef VFS_VFS_H_
#define VFS_VFS_H_
 
#include <ipc/ipc.h>
#include <libadt/list.h>
#include <atomic.h>
#include <rwlock.h>
#include <sys/types.h>
#include <bool.h>
 
#define dprintf(...)    printf(__VA_ARGS__)
 
#define VFS_FIRST   IPC_FIRST_USER_METHOD
 
#define IPC_METHOD_TO_VFS_OP(m) ((m) - VFS_FIRST)   
 
typedef enum {
    VFS_OPEN = VFS_FIRST,
    VFS_CLOSE,
    VFS_READ,
    VFS_WRITE,
    VFS_TRUNCATE,
    VFS_RENAME,
    VFS_OPENDIR,
    VFS_READDIR,
    VFS_CLOSEDIR,
    VFS_MKDIR,
    VFS_UNLINK,
    VFS_MOUNT,
    VFS_UNMOUNT,
    VFS_LAST_CMN,   /* keep this the last member of this enum */
} vfs_request_cmn_t;
 
typedef enum {
    VFS_LOOKUP = VFS_LAST_CMN,
    VFS_LAST_CLNT,  /* keep this the last member of this enum */
} vfs_request_clnt_t;
 
typedef enum {
    VFS_REGISTER = VFS_LAST_CMN,
    VFS_SEEK,
    VFS_LAST_SRV,   /* keep this the last member of this enum */
} vfs_request_srv_t;
 
 
/**
 * An instance of this structure is associated with a particular FS operation.
 * It tells VFS if the FS supports the operation or maybe if a default one
 * should be used.
 */
typedef enum {
    VFS_OP_NULL = 0,
    VFS_OP_DEFAULT,
    VFS_OP_DEFINED
} vfs_op_t;
 
#define FS_NAME_MAXLEN  20
 
/**
 * A structure like this is passed to VFS by each individual FS upon its
 * registration. It assosiates a human-readable identifier with each
 * registered FS. More importantly, through this structure, the FS announces
 * what operations it supports.
 */
typedef struct {
    /** Unique identifier of the fs. */
    char name[FS_NAME_MAXLEN + 1];
   
    /** Operations. */
    vfs_op_t ops[VFS_LAST_CLNT - VFS_FIRST];
} vfs_info_t;
 
/**
 * A structure like this will be allocated for each registered file system.
 */
typedef struct {
    link_t fs_link;
    vfs_info_t vfs_info;
    int fs_handle;
    atomic_t phone_futex;   /**< Phone serializing futex. */
    ipcarg_t phone;
} fs_info_t;
 
/**
 * VFS_PAIR uniquely represents a file system instance.
 */
#define VFS_PAIR    \
    int fs_handle;  \
    int dev_handle; 
 
/**
 * VFS_TRIPLET uniquely identifies a file system node (e.g. directory, file) but
 * doesn't contain any state. For a stateful structure, see vfs_node_t.
 *
 * @note    fs_handle, dev_handle and index are meant to be returned in one
 *      IPC reply.
 */
#define VFS_TRIPLET \
    VFS_PAIR;   \
    uint64_t index;
 
typedef struct {
    VFS_PAIR;
} vfs_pair_t;
 
typedef struct {
    VFS_TRIPLET;
} vfs_triplet_t;
 
/*
 * Lookup flags.
 */
/**
 * Lookup will succeed only if the object is a regular file.  If L_CREATE is
 * specified, an empty file will be created. This flag is mutually exclusive
 * with L_DIRECTORY.
 */
#define L_FILE      1
/**
 * Lookup wil succeed only if the object is a directory. If L_CREATE is
 * specified, an empty directory will be created. This flag is mutually
 * exclusive with L_FILE.
 */
#define L_DIRECTORY 2
/**
 * When used with L_CREATE, L_EXCLUSIVE will cause the lookup to fail if the
 * object already exists. L_EXCLUSIVE is implied when L_DIRECTORY is used.
 */
#define L_EXCLUSIVE 4
/**
 * L_CREATE is used for creating both regular files and directories.
 */
#define L_CREATE    8
/**
 * L_DESTROY is used to remove leaves from the file system namespace. This flag
 * cannot be passed directly by the client, but will be set by VFS during
 * VFS_UNLINK.
 */
#define L_DESTROY   16
 
typedef struct {
    vfs_triplet_t triplet;
    size_t size;
    unsigned lnkcnt;
} vfs_lookup_res_t;
 
/**
 * Instances of this type represent an active, in-memory VFS node and any state
 * which may be associated with it.
 */
typedef struct {
    VFS_TRIPLET;        /**< Identity of the node. */
 
    /**
     * Usage counter.  This includes, but is not limited to, all vfs_file_t
     * structures that reference this node.
     */
    unsigned refcnt;
   
    /** Number of names this node has in the file system namespace. */
    unsigned lnkcnt;
 
    link_t nh_link;     /**< Node hash-table link. */
    size_t size;        /**< Cached size of the file. */
 
    /**
     * Holding this rwlock prevents modifications of the node's contents.
     */
    rwlock_t contents_rwlock;
} vfs_node_t;
 
/**
 * Instances of this type represent an open file. If the file is opened by more
 * than one task, there will be a separate structure allocated for each task.
 */
typedef struct {
    /** Serializes access to this open file. */
    futex_t lock;
 
    vfs_node_t *node;
   
    /** Number of file handles referencing this file. */
    unsigned refcnt;
 
    /** Append on write. */
    bool append;
 
    /** Current position in the file. */
    off_t pos;
} vfs_file_t;
 
extern link_t fs_head;      /**< List of registered file systems. */
 
extern vfs_triplet_t rootfs;    /**< Root node of the root file system. */
 
#define MAX_PATH_LEN        (64 * 1024)
 
#define PLB_SIZE        (2 * MAX_PATH_LEN)
 
/** Each instance of this type describes one path lookup in progress. */
typedef struct {
    link_t  plb_link;   /**< Active PLB entries list link. */
    unsigned index;     /**< Index of the first character in PLB. */
    size_t len;     /**< Number of characters in this PLB entry. */
} plb_entry_t;
 
extern atomic_t plb_futex;  /**< Futex protecting plb and plb_head. */
extern uint8_t *plb;        /**< Path Lookup Buffer */
extern link_t plb_head;     /**< List of active PLB entries. */
 
/** Holding this rwlock prevents changes in file system namespace. */
extern rwlock_t namespace_rwlock;
 
extern int vfs_grab_phone(int);
extern void vfs_release_phone(int);
 
extern int fs_name_to_handle(char *, bool);
 
extern int vfs_lookup_internal(char *, size_t, int, vfs_lookup_res_t *,
    vfs_pair_t *);
 
extern bool vfs_nodes_init(void);
extern vfs_node_t *vfs_node_get(vfs_lookup_res_t *);
extern void vfs_node_put(vfs_node_t *);
 
#define MAX_OPEN_FILES  128
 
extern bool vfs_files_init(void);
extern vfs_file_t *vfs_file_get(int);
extern int vfs_fd_alloc(void);
extern void vfs_fd_free(int);
 
extern void vfs_file_addref(vfs_file_t *);
extern void vfs_file_delref(vfs_file_t *);
 
extern void vfs_node_addref(vfs_node_t *);
extern void vfs_node_delref(vfs_node_t *);
 
extern void vfs_register(ipc_callid_t, ipc_call_t *);
extern void vfs_mount(ipc_callid_t, ipc_call_t *);
extern void vfs_open(ipc_callid_t, ipc_call_t *);
extern void vfs_read(ipc_callid_t, ipc_call_t *);
extern void vfs_write(ipc_callid_t, ipc_call_t *);
extern void vfs_seek(ipc_callid_t, ipc_call_t *);
extern void vfs_truncate(ipc_callid_t, ipc_call_t *);
extern void vfs_mkdir(ipc_callid_t, ipc_call_t *);
 
#endif
 
/**
 * @}
 */
 

Rev 2709	Rev 2730
1	/*	1	/*
2	* Copyright (c) 2008 Jakub Jermar	2	* Copyright (c) 2008 Jakub Jermar
3	* All rights reserved.	3	* All rights reserved.
4	*	4	*
5	* Redistribution and use in source and binary forms, with or without	5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions	6	* modification, are permitted provided that the following conditions
7	* are met:	7	* are met:
8	*	8	*
9	* - Redistributions of source code must retain the above copyright	9	* - Redistributions of source code must retain the above copyright
10	* notice, this list of conditions and the following disclaimer.	10	* notice, this list of conditions and the following disclaimer.
11	* - Redistributions in binary form must reproduce the above copyright	11	* - Redistributions in binary form must reproduce the above copyright
12	* notice, this list of conditions and the following disclaimer in the	12	* notice, this list of conditions and the following disclaimer in the
13	* documentation and/or other materials provided with the distribution.	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	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.	15	* derived from this software without specific prior written permission.
16	*	16	*
17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	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	18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	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	23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	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	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.	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	*/	27	*/
28		28
29	/** @addtogroup fs	29	/** @addtogroup fs
30	* @{	30	* @{
31	*/	31	*/
32		32
33	#ifndef VFS_VFS_H_	33	#ifndef VFS_VFS_H_
34	#define VFS_VFS_H_	34	#define VFS_VFS_H_
35		35
36	#include <ipc/ipc.h>	36	#include <ipc/ipc.h>
37	#include <libadt/list.h>	37	#include <libadt/list.h>
38	#include <atomic.h>	38	#include <atomic.h>
39	#include <rwlock.h>	39	#include <rwlock.h>
40	#include <sys/types.h>	40	#include <sys/types.h>
41	#include <bool.h>	41	#include <bool.h>
42		42
43	#define dprintf(...) printf(__VA_ARGS__)	43	#define dprintf(...) printf(__VA_ARGS__)
44		44
45	#define VFS_FIRST IPC_FIRST_USER_METHOD	45	#define VFS_FIRST IPC_FIRST_USER_METHOD
46		46
47	#define IPC_METHOD_TO_VFS_OP(m) ((m) - VFS_FIRST)	47	#define IPC_METHOD_TO_VFS_OP(m) ((m) - VFS_FIRST)
48		48
49	typedef enum {	49	typedef enum {
50	VFS_OPEN = VFS_FIRST,	50	VFS_OPEN = VFS_FIRST,
51	VFS_CLOSE,	51	VFS_CLOSE,
52	VFS_READ,	52	VFS_READ,
53	VFS_WRITE,	53	VFS_WRITE,
54	VFS_TRUNCATE,	54	VFS_TRUNCATE,
55	VFS_RENAME,	55	VFS_RENAME,
56	VFS_OPENDIR,	56	VFS_OPENDIR,
57	VFS_READDIR,	57	VFS_READDIR,
58	VFS_CLOSEDIR,	58	VFS_CLOSEDIR,
59	VFS_MKDIR,	59	VFS_MKDIR,
60	VFS_UNLINK,	60	VFS_UNLINK,
61	VFS_MOUNT,	61	VFS_MOUNT,
62	VFS_UNMOUNT,	62	VFS_UNMOUNT,
63	VFS_LAST_CMN, /* keep this the last member of this enum */	63	VFS_LAST_CMN, /* keep this the last member of this enum */
64	} vfs_request_cmn_t;	64	} vfs_request_cmn_t;
65		65
66	typedef enum {	66	typedef enum {
67	VFS_LOOKUP = VFS_LAST_CMN,	67	VFS_LOOKUP = VFS_LAST_CMN,
68	VFS_LAST_CLNT, /* keep this the last member of this enum */	68	VFS_LAST_CLNT, /* keep this the last member of this enum */
69	} vfs_request_clnt_t;	69	} vfs_request_clnt_t;
70		70
71	typedef enum {	71	typedef enum {
72	VFS_REGISTER = VFS_LAST_CMN,	72	VFS_REGISTER = VFS_LAST_CMN,
73	VFS_SEEK,	73	VFS_SEEK,
74	VFS_LAST_SRV, /* keep this the last member of this enum */	74	VFS_LAST_SRV, /* keep this the last member of this enum */
75	} vfs_request_srv_t;	75	} vfs_request_srv_t;
76		76
77		77
78	/**	78	/**
79	* An instance of this structure is associated with a particular FS operation.	79	* An instance of this structure is associated with a particular FS operation.
80	* It tells VFS if the FS supports the operation or maybe if a default one	80	* It tells VFS if the FS supports the operation or maybe if a default one
81	* should be used.	81	* should be used.
82	*/	82	*/
83	typedef enum {	83	typedef enum {
84	VFS_OP_NULL = 0,	84	VFS_OP_NULL = 0,
85	VFS_OP_DEFAULT,	85	VFS_OP_DEFAULT,
86	VFS_OP_DEFINED	86	VFS_OP_DEFINED
87	} vfs_op_t;	87	} vfs_op_t;
88		88
89	#define FS_NAME_MAXLEN 20	89	#define FS_NAME_MAXLEN 20
90		90
91	/**	91	/**
92	* A structure like this is passed to VFS by each individual FS upon its	92	* A structure like this is passed to VFS by each individual FS upon its
93	* registration. It assosiates a human-readable identifier with each	93	* registration. It assosiates a human-readable identifier with each
94	* registered FS. More importantly, through this structure, the FS announces	94	* registered FS. More importantly, through this structure, the FS announces
95	* what operations it supports.	95	* what operations it supports.
96	*/	96	*/
97	typedef struct {	97	typedef struct {
98	/** Unique identifier of the fs. */	98	/** Unique identifier of the fs. */
99	char name[FS_NAME_MAXLEN + 1];	99	char name[FS_NAME_MAXLEN + 1];
100		100
101	/** Operations. */	101	/** Operations. */
102	vfs_op_t ops[VFS_LAST_CLNT - VFS_FIRST];	102	vfs_op_t ops[VFS_LAST_CLNT - VFS_FIRST];
103	} vfs_info_t;	103	} vfs_info_t;
104		104
105	/**	105	/**
106	* A structure like this will be allocated for each registered file system.	106	* A structure like this will be allocated for each registered file system.
107	*/	107	*/
108	typedef struct {	108	typedef struct {
109	link_t fs_link;	109	link_t fs_link;
110	vfs_info_t vfs_info;	110	vfs_info_t vfs_info;
111	int fs_handle;	111	int fs_handle;
112	atomic_t phone_futex; /*< Phone serializing futex. /	112	atomic_t phone_futex; /*< Phone serializing futex. /
113	ipcarg_t phone;	113	ipcarg_t phone;
114	} fs_info_t;	114	} fs_info_t;
115		115
116	/**	116	/**
117	* VFS_PAIR uniquely represents a file system instance.	117	* VFS_PAIR uniquely represents a file system instance.
118	*/	118	*/
119	#define VFS_PAIR \	119	#define VFS_PAIR \
120	int fs_handle; \	120	int fs_handle; \
121	int dev_handle;	121	int dev_handle;
122		122
123	/**	123	/**
124	* VFS_TRIPLET uniquely identifies a file system node (e.g. directory, file) but	124	* VFS_TRIPLET uniquely identifies a file system node (e.g. directory, file) but
125	* doesn't contain any state. For a stateful structure, see vfs_node_t.	125	* doesn't contain any state. For a stateful structure, see vfs_node_t.
126	*	126	*
127	* @note fs_handle, dev_handle and index are meant to be returned in one	127	* @note fs_handle, dev_handle and index are meant to be returned in one
128	* IPC reply.	128	* IPC reply.
129	*/	129	*/
130	#define VFS_TRIPLET \	130	#define VFS_TRIPLET \
131	VFS_PAIR; \	131	VFS_PAIR; \
132	uint64_t index;	132	uint64_t index;
133		133
134	typedef struct {	134	typedef struct {
135	VFS_PAIR;	135	VFS_PAIR;
136	} vfs_pair_t;	136	} vfs_pair_t;
137		137
138	typedef struct {	138	typedef struct {
139	VFS_TRIPLET;	139	VFS_TRIPLET;
140	} vfs_triplet_t;	140	} vfs_triplet_t;
141		141
142	/*	142	/*
143	* Lookup flags.	143	* Lookup flags.
144	*/	144	*/
145	/**	145	/**
146	* Lookup will succeed only if the object is a regular file. If L_CREATE is	146	* Lookup will succeed only if the object is a regular file. If L_CREATE is
147	* specified, an empty file will be created. This flag is mutually exclusive	147	* specified, an empty file will be created. This flag is mutually exclusive
148	* with L_DIRECTORY.	148	* with L_DIRECTORY.
149	*/	149	*/
150	#define L_FILE 1	150	#define L_FILE 1
151	/**	151	/**
152	* Lookup wil succeed only if the object is a directory. If L_CREATE is	152	* Lookup wil succeed only if the object is a directory. If L_CREATE is
153	* specified, an empty directory will be created. This flag is mutually	153	* specified, an empty directory will be created. This flag is mutually
154	* exclusive with L_FILE.	154	* exclusive with L_FILE.
155	*/	155	*/
156	#define L_DIRECTORY 2	156	#define L_DIRECTORY 2
157	/**	157	/**
158	* When used with L_CREATE, L_EXCLUSIVE will cause the lookup to fail if the	158	* When used with L_CREATE, L_EXCLUSIVE will cause the lookup to fail if the
159	* object already exists. L_EXCLUSIVE is implied when L_DIRECTORY is used.	159	* object already exists. L_EXCLUSIVE is implied when L_DIRECTORY is used.
160	*/	160	*/
161	#define L_EXCLUSIVE 4	161	#define L_EXCLUSIVE 4
162	/**	162	/**
163	* L_CREATE is used for creating both regular files and directories.	163	* L_CREATE is used for creating both regular files and directories.
164	*/	164	*/
165	#define L_CREATE 8	165	#define L_CREATE 8
166	/**	166	/**
167	* L_DESTROY is used to remove leaves from the file system namespace. This flag	167	* L_DESTROY is used to remove leaves from the file system namespace. This flag
168	* cannot be passed directly by the client, but will be set by VFS during	168	* cannot be passed directly by the client, but will be set by VFS during
169	* VFS_UNLINK.	169	* VFS_UNLINK.
170	*/	170	*/
171	#define L_DESTROY 16	171	#define L_DESTROY 16
172		172
173	typedef struct {	173	typedef struct {
174	vfs_triplet_t triplet;	174	vfs_triplet_t triplet;
175	size_t size;	175	size_t size;
-		176	unsigned lnkcnt;
176	} vfs_lookup_res_t;	177	} vfs_lookup_res_t;
177		178
178	/**	179	/**
179	* Instances of this type represent an active, in-memory VFS node and any state	180	* Instances of this type represent an active, in-memory VFS node and any state
180	* which may be associated with it.	181	* which may be associated with it.
181	*/	182	*/
182	typedef struct {	183	typedef struct {
183	VFS_TRIPLET; /*< Identity of the node. /	184	VFS_TRIPLET; /*< Identity of the node. /
-		185
-		186	/**
-		187	* Usage counter. This includes, but is not limited to, all vfs_file_t
-		188	* structures that reference this node.
-		189	*/
184	unsigned refcnt; /*< Usage counter. /	190	unsigned refcnt;
-		191
-		192	/** Number of names this node has in the file system namespace. */
-		193	unsigned lnkcnt;
-		194
185	link_t nh_link; /*< Node hash-table link. /	195	link_t nh_link; /*< Node hash-table link. /
186	size_t size; /*< Cached size of the file. /	196	size_t size; /*< Cached size of the file. /
187		197
188	/**	198	/**
189	* Holding this rwlock prevents modifications of the node's contents.	199	* Holding this rwlock prevents modifications of the node's contents.
190	*/	200	*/
191	rwlock_t contents_rwlock;	201	rwlock_t contents_rwlock;
192	} vfs_node_t;	202	} vfs_node_t;
193		203
194	/**	204	/**
195	* Instances of this type represent an open file. If the file is opened by more	205	* Instances of this type represent an open file. If the file is opened by more
196	* than one task, there will be a separate structure allocated for each task.	206	* than one task, there will be a separate structure allocated for each task.
197	*/	207	*/
198	typedef struct {	208	typedef struct {
199	/** Serializes access to this open file. */	209	/** Serializes access to this open file. */
200	futex_t lock;	210	futex_t lock;
201		211
202	vfs_node_t *node;	212	vfs_node_t *node;
203		213
204	/** Number of file handles referencing this file. */	214	/** Number of file handles referencing this file. */
205	unsigned refcnt;	215	unsigned refcnt;
206		216
207	/** Append on write. */	217	/** Append on write. */
208	bool append;	218	bool append;
209		219
210	/** Current position in the file. */	220	/** Current position in the file. */
211	off_t pos;	221	off_t pos;
212	} vfs_file_t;	222	} vfs_file_t;
213		223
214	extern link_t fs_head; /*< List of registered file systems. /	224	extern link_t fs_head; /*< List of registered file systems. /
215		225
216	extern vfs_triplet_t rootfs; /*< Root node of the root file system. /	226	extern vfs_triplet_t rootfs; /*< Root node of the root file system. /
217		227
218	#define MAX_PATH_LEN (64 * 1024)	228	#define MAX_PATH_LEN (64 * 1024)
219		229
220	#define PLB_SIZE (2 * MAX_PATH_LEN)	230	#define PLB_SIZE (2 * MAX_PATH_LEN)
221		231
222	/** Each instance of this type describes one path lookup in progress. */	232	/** Each instance of this type describes one path lookup in progress. */
223	typedef struct {	233	typedef struct {
224	link_t plb_link; /*< Active PLB entries list link. /	234	link_t plb_link; /*< Active PLB entries list link. /
225	unsigned index; /*< Index of the first character in PLB. /	235	unsigned index; /*< Index of the first character in PLB. /
226	size_t len; /*< Number of characters in this PLB entry. /	236	size_t len; /*< Number of characters in this PLB entry. /
227	} plb_entry_t;	237	} plb_entry_t;
228		238
229	extern atomic_t plb_futex; /*< Futex protecting plb and plb_head. /	239	extern atomic_t plb_futex; /*< Futex protecting plb and plb_head. /
230	extern uint8_t plb; /< Path Lookup Buffer /	240	extern uint8_t plb; /< Path Lookup Buffer /
231	extern link_t plb_head; /*< List of active PLB entries. /	241	extern link_t plb_head; /*< List of active PLB entries. /
232		242
233	/** Holding this rwlock prevents changes in file system namespace. */	243	/** Holding this rwlock prevents changes in file system namespace. */
234	extern rwlock_t namespace_rwlock;	244	extern rwlock_t namespace_rwlock;
235		245
236	extern int vfs_grab_phone(int);	246	extern int vfs_grab_phone(int);
237	extern void vfs_release_phone(int);	247	extern void vfs_release_phone(int);
238		248
239	extern int fs_name_to_handle(char *, bool);	249	extern int fs_name_to_handle(char *, bool);
240		250
241	extern int vfs_lookup_internal(char , size_t, int, vfs_lookup_res_t ,	251	extern int vfs_lookup_internal(char , size_t, int, vfs_lookup_res_t ,
242	vfs_pair_t *);	252	vfs_pair_t *);
243		253
244	extern bool vfs_nodes_init(void);	254	extern bool vfs_nodes_init(void);
245	extern vfs_node_t vfs_node_get(vfs_lookup_res_t );	255	extern vfs_node_t vfs_node_get(vfs_lookup_res_t );
246	extern void vfs_node_put(vfs_node_t *);	256	extern void vfs_node_put(vfs_node_t *);
247		257
248	#define MAX_OPEN_FILES 128	258	#define MAX_OPEN_FILES 128
249		259
250	extern bool vfs_files_init(void);	260	extern bool vfs_files_init(void);
251	extern vfs_file_t *vfs_file_get(int);	261	extern vfs_file_t *vfs_file_get(int);
252	extern int vfs_fd_alloc(void);	262	extern int vfs_fd_alloc(void);
253	extern void vfs_fd_free(int);	263	extern void vfs_fd_free(int);
254		264
255	extern void vfs_file_addref(vfs_file_t *);	265	extern void vfs_file_addref(vfs_file_t *);
256	extern void vfs_file_delref(vfs_file_t *);	266	extern void vfs_file_delref(vfs_file_t *);
257		267
258	extern void vfs_node_addref(vfs_node_t *);	268	extern void vfs_node_addref(vfs_node_t *);
259	extern void vfs_node_delref(vfs_node_t *);	269	extern void vfs_node_delref(vfs_node_t *);
260		270
261	extern void vfs_register(ipc_callid_t, ipc_call_t *);	271	extern void vfs_register(ipc_callid_t, ipc_call_t *);
262	extern void vfs_mount(ipc_callid_t, ipc_call_t *);	272	extern void vfs_mount(ipc_callid_t, ipc_call_t *);
263	extern void vfs_open(ipc_callid_t, ipc_call_t *);	273	extern void vfs_open(ipc_callid_t, ipc_call_t *);
264	extern void vfs_read(ipc_callid_t, ipc_call_t *);	274	extern void vfs_read(ipc_callid_t, ipc_call_t *);
265	extern void vfs_write(ipc_callid_t, ipc_call_t *);	275	extern void vfs_write(ipc_callid_t, ipc_call_t *);
266	extern void vfs_seek(ipc_callid_t, ipc_call_t *);	276	extern void vfs_seek(ipc_callid_t, ipc_call_t *);
267	extern void vfs_truncate(ipc_callid_t, ipc_call_t *);	277	extern void vfs_truncate(ipc_callid_t, ipc_call_t *);
268	extern void vfs_mkdir(ipc_callid_t, ipc_call_t *);	278	extern void vfs_mkdir(ipc_callid_t, ipc_call_t *);
269		279
270	#endif	280	#endif
271		281
272	/**	282	/**
273	* @}	283	* @}
274	*/	284	*/
275		285

Subversion Repositories HelenOS

(root)/trunk/uspace/srv/vfs/vfs.h – Rev 2709 → 2730