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	*/
2435	jelen	35
		36	/** @addtogroup FileSystemImpl
		37	* @{
		38	*/
2404	konopa	39
2435	jelen	40	/**
		41	* @file stadir.c
		42	* @brief This file contains the code for performing four system calls relating to
		43	* status and directories.
2380	konopa	44	*/
		45
		46
		47	#include "fs.h"
		48	#include "stat.h"
		49	#include "file.h"
		50	#include "fproc.h"
		51	#include "inode.h"
		52	#include "param.h"
		53
		54
		55	static int change(inode_t *iip, char name_ptr, int len);
		56	static int stat_inode(inode_t rip, filp_t fil_ptr, char *user_addr);
2435	jelen	57
		58	/**
		59	* Perform the CHDIR system call
		60	*/
2380	konopa	61	int do_chdir()
		62	{
		63
		64	/* Perform the chdir(file_name) system call */
		65	int r;
		66
		67	r = change(&fp->fp_workdir, file_name, strlen(file_name)+1);
		68
		69	return r;
		70	}
2435	jelen	71
		72	/**
		73	* Execute changing the current directory
		74	*/
2380	konopa	75	int change(inode_t *iip, char name_ptr, int len)
		76	{
		77
		78	/*
		79	* iip: pointer to the inode pointer for the dir
		80	* name_ptr: pointer to the directory name to change to
		81	* len: length of the directory name string
		82	*/
		83
		84	/* Do the actual work for chdir() and chroot(). */
		85
		86	inode_t *rip;
		87	register int r;
		88
		89	r = OK;
		90
		91	/* Try to open the new directory. */
		92	if (fetch_name(name_ptr, len) != OK)
		93	return err_code;
		94
		95	if ((rip = eat_path(user_path)) == NIL_INODE)
		96	return err_code;
		97
		98	/* It must be a directory and also be searchable. */
		99	if ((rip->i_mode & I_TYPE) != I_DIRECTORY)
		100	r = FS_ENOTDIR;
		101
		102	/* If error, return inode. */
		103	if (r != OK) {
		104	put_inode(rip);
		105	return r;
		106	}
		107
		108	/* Everything is OK. Make the change. */
		109	put_inode(iip); / release the old directory */
		110	iip = rip; / acquire the new one */
		111
		112	return OK;
		113	}
2435	jelen	114
		115	/**
		116	* Perform the STAT system call
		117	*/
2380	konopa	118	int do_stat()
		119	{
		120
		121	/* Perform the stat(name, buf) system call. */
		122
		123	register inode_t *rip;
		124	register int r;
		125
		126	/* Both stat() and fstat() use the same routine to do the real work. That
		127	* routine expects an inode, so acquire it temporarily.
		128	*/
		129
		130	if (fetch_name(file_name, strlen(file_name)+1) != OK)
		131	return err_code;
2404	konopa	132
2380	konopa	133	if ((rip = eat_path(user_path)) == NIL_INODE)
		134	return err_code;
2404	konopa	135
2380	konopa	136	r = stat_inode(rip, NIL_FILP, fp->buffer); /* actually do the work.*/
		137	put_inode(rip); /* release the inode */
		138
		139	return r;
		140	}
2435	jelen	141
		142	/**
		143	* Perform the FSTAT system call
		144	*/
2380	konopa	145	int do_fstat()
		146	{
		147
		148	/* Perform the fstat(fd, buf) system call. */
		149
		150	register filp_t *rfilp;
		151
		152
		153	/* Is the file descriptor valid? */
		154	if ((rfilp = get_filp(fd)) == NIL_FILP)
		155	return err_code;
		156
		157	if (rfilp->filp_ino == NIL_INODE)
		158	return FS_ENOENT;
		159
		160	return(stat_inode(rfilp->filp_ino, NIL_FILP, fp->buffer));
		161	}
2435	jelen	162
		163	/**
		164	* Execute the actual STAT operation
		165	*/
2380	konopa	166	int stat_inode(register inode_t rip, filp_t fil_ptr, char *user_addr)
		167	{
		168
		169	/*
		170	* rip: pointer to inode to stat
		171	* fil_ptr: filp pointer, supplied by 'fstat'
		172	* user_addr: user space address where stat buf goes
		173	*/
		174
		175	/* Common code for stat and fstat system calls. */
		176
		177	stat_t statbuf;
		178
		179	/* Fill in the statbuf struct. */
		180	statbuf.st_ino = rip->i_num;
		181	statbuf.st_mode = rip->i_mode;
		182	statbuf.st_nlink = rip->i_nlinks & BYTE;
		183	statbuf.st_size = rip->i_size;
		184
		185	/* Copy infomations to userspace. */
		186	memcpy(user_addr, &statbuf, sizeof(statbuf));
		187
		188	return OK;
		189	}
		190
2435	jelen	191
		192	/**
		193	* }
		194	*/
		195

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