WebSVN – HelenOS – Blame – /branches/fs/uspace/fs/stadir.c

Rev	Author	Line No.	Line
2404	konopa	1	/*
		2	* Copyright (c) 1987,1997, Prentice Hall
		3	* All rights reserved.
		4	*
		5	* Redistribution and use of the MINIX operating system in source and
		6	* binary forms, with or without modification, are permitted provided
		7	* that the following conditions are met:
		8
		9	* - Redistributions of source code must retain the above copyright
		10	* notice, this list of conditions and the following disclaimer.
		11
		12	* - Redistributions in binary form must reproduce the above
		13	* copyright notice, this list of conditions and the following
		14	* disclaimer in the documentation and/or other materials provided
		15	* with the distribution.
		16
		17	* - Neither the name of Prentice Hall nor the names of the software
		18	* authors or contributors may be used to endorse or promote
		19	* products derived from this software without specific prior
		20	* written permission.
		21
		22	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS, AUTHORS, AND
		23	* CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
		24	* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
		25	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
		26	* IN NO EVENT SHALL PRENTICE HALL OR ANY AUTHORS OR CONTRIBUTORS BE
		27	* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
		28	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
		29	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
		30	* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
		31	* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
		32	* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
		33	* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
		34	*/
		35
		36
2380	konopa	37	/* This file contains the code for performing four system calls relating to
		38	* status and directories.
		39	*/
		40
		41	/* Methods:
		42	* do_chdir: perform the CHDIR system call
		43	* do_stat: perform the STAT system call
		44	* do_fstat: perform the FSTAT system call
		45	*/
		46
		47
		48	#include "fs.h"
		49	#include "stat.h"
		50	#include "file.h"
		51	#include "fproc.h"
		52	#include "inode.h"
		53	#include "param.h"
		54
		55
		56	static int change(inode_t *iip, char name_ptr, int len);
		57	static int stat_inode(inode_t rip, filp_t fil_ptr, char *user_addr);
		58
		59	int do_chdir()
		60	{
		61
		62	/* Perform the chdir(file_name) system call */
		63	int r;
		64
		65	r = change(&fp->fp_workdir, file_name, strlen(file_name)+1);
		66
		67	return r;
		68	}
		69
		70	int change(inode_t *iip, char name_ptr, int len)
		71	{
		72
		73	/*
		74	* iip: pointer to the inode pointer for the dir
		75	* name_ptr: pointer to the directory name to change to
		76	* len: length of the directory name string
		77	*/
		78
		79	/* Do the actual work for chdir() and chroot(). */
		80
		81	inode_t *rip;
		82	register int r;
		83
		84	r = OK;
		85
		86	/* Try to open the new directory. */
		87	if (fetch_name(name_ptr, len) != OK)
		88	return err_code;
		89
		90	if ((rip = eat_path(user_path)) == NIL_INODE)
		91	return err_code;
		92
		93	/* It must be a directory and also be searchable. */
		94	if ((rip->i_mode & I_TYPE) != I_DIRECTORY)
		95	r = FS_ENOTDIR;
		96
		97	/* If error, return inode. */
		98	if (r != OK) {
		99	put_inode(rip);
		100	return r;
		101	}
		102
		103	/* Everything is OK. Make the change. */
		104	put_inode(iip); / release the old directory */
		105	iip = rip; / acquire the new one */
		106
		107	return OK;
		108	}
		109
		110	int do_stat()
		111	{
		112
		113	/* Perform the stat(name, buf) system call. */
		114
		115	register inode_t *rip;
		116	register int r;
		117
		118	/* Both stat() and fstat() use the same routine to do the real work. That
		119	* routine expects an inode, so acquire it temporarily.
		120	*/
		121
		122	if (fetch_name(file_name, strlen(file_name)+1) != OK)
		123	return err_code;
2404	konopa	124
2380	konopa	125	if ((rip = eat_path(user_path)) == NIL_INODE)
		126	return err_code;
2404	konopa	127
2380	konopa	128	r = stat_inode(rip, NIL_FILP, fp->buffer); /* actually do the work.*/
		129	put_inode(rip); /* release the inode */
		130
		131	return r;
		132	}
		133
		134	int do_fstat()
		135	{
		136
		137	/* Perform the fstat(fd, buf) system call. */
		138
		139	register filp_t *rfilp;
		140
		141
		142	/* Is the file descriptor valid? */
		143	if ((rfilp = get_filp(fd)) == NIL_FILP)
		144	return err_code;
		145
		146	if (rfilp->filp_ino == NIL_INODE)
		147	return FS_ENOENT;
		148
		149	return(stat_inode(rfilp->filp_ino, NIL_FILP, fp->buffer));
		150	}
		151
		152	int stat_inode(register inode_t rip, filp_t fil_ptr, char *user_addr)
		153	{
		154
		155	/*
		156	* rip: pointer to inode to stat
		157	* fil_ptr: filp pointer, supplied by 'fstat'
		158	* user_addr: user space address where stat buf goes
		159	*/
		160
		161	/* Common code for stat and fstat system calls. */
		162
		163	stat_t statbuf;
		164
		165	/* Fill in the statbuf struct. */
		166	statbuf.st_ino = rip->i_num;
		167	statbuf.st_mode = rip->i_mode;
		168	statbuf.st_nlink = rip->i_nlinks & BYTE;
		169	statbuf.st_size = rip->i_size;
		170
		171	/* Copy infomations to userspace. */
		172	memcpy(user_addr, &statbuf, sizeof(statbuf));
		173
		174	return OK;
		175	}
		176

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(root)/branches/fs/uspace/fs/stadir.c @ 2435 – Rev 2404