| 1 | /*
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| 2 | * sys_open.c - open a file.
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| 3 | *
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| 4 | * Author Alain Greiner (2016,2017,2018,2019)
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| 5 | *
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| 6 | * Copyright (c) UPMC Sorbonne Universites
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| 7 | *
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| 8 | * This file is part of ALMOS-MKH.
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| 9 | *
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| 10 | * ALMOS-MKH is free software; you can redistribute it and/or modify it
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| 11 | * under the terms of the GNU General Public License as published by
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| 12 | * the Free Software Foundation; version 2.0 of the License.
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| 13 | *
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| 14 | * ALMOS-MKH is distributed in the hope that it will be useful, but
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| 15 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 17 | * General Public License for more details.
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| 18 | *
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| 19 | * You should have received a copy of the GNU General Public License
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| 20 | * along with ALMOS-MKH; if not, write to the Free Software Foundation,
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| 21 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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| 22 | */
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| 23 |
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| 24 | #include <kernel_config.h>
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| 25 | #include <hal_kernel_types.h>
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| 26 | #include <hal_uspace.h>
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| 27 | #include <errno.h>
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| 28 | #include <thread.h>
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| 29 | #include <printk.h>
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| 30 | #include <vfs.h>
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| 31 | #include <process.h>
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| 32 | #include <remote_rwlock.h>
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| 33 |
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| 34 | #include <syscalls.h>
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| 35 |
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| 36 | ///////////////////////////////////
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| 37 | int sys_open ( char * pathname,
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| 38 | uint32_t flags,
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| 39 | uint32_t mode )
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| 40 | {
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| 41 | error_t error;
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| 42 | xptr_t file_xp; // extended pointer on vfs_file_t
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| 43 | uint32_t file_id; // file descriptor index
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| 44 | xptr_t root_inode_xp; // extended pointer on path root inode
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| 45 |
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| 46 | char kbuf[CONFIG_VFS_MAX_PATH_LENGTH];
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| 47 |
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| 48 | thread_t * this = CURRENT_THREAD;
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| 49 | process_t * process = this->process;
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| 50 |
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| 51 | #if (DEBUG_SYS_OPEN || CONFIG_INSTRUMENTATION_SYSCALLS)
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| 52 | uint64_t tm_start = hal_get_cycles();
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| 53 | #endif
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| 54 |
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| 55 | // check fd_array not full
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| 56 | if( process_fd_array_full() )
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| 57 | {
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| 58 |
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| 59 | #if DEBUG_SYSCALLS_ERROR
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| 60 | printk("\n[ERROR] in %s : file descriptor array full for process %x\n",
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| 61 | __FUNCTION__ , process->pid );
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| 62 | #endif
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| 63 | this->errno = ENFILE;
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| 64 | return -1;
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| 65 | }
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| 66 |
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| 67 | // check pathname length
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| 68 | if( hal_strlen_from_uspace( pathname ) >= CONFIG_VFS_MAX_PATH_LENGTH )
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| 69 | {
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| 70 |
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| 71 | #if DEBUG_SYSCALLS_ERROR
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| 72 | printk("\n[ERROR] in %s : pathname too long\n", __FUNCTION__ );
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| 73 | #endif
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| 74 | this->errno = ENFILE;
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| 75 | return -1;
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| 76 | }
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| 77 |
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| 78 | // copy pathname in kernel space
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| 79 | hal_strcpy_from_uspace( XPTR( local_cxy , kbuf ) , pathname , CONFIG_VFS_MAX_PATH_LENGTH );
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| 80 |
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| 81 | #if DEBUG_SYS_OPEN
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| 82 | if( DEBUG_SYS_OPEN < tm_start )
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| 83 | printk("\n[%s] thread[%x,%x] enter for <%s> / flags %x / cycle %d\n",
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| 84 | __FUNCTION__, process->pid, this->trdid, kbuf, flags, (uint32_t)tm_start );
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| 85 | #endif
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| 86 |
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| 87 | // get cluster and local pointer on reference process
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| 88 | xptr_t ref_xp = process->ref_xp;
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| 89 | process_t * ref_ptr = (process_t *)GET_PTR( ref_xp );
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| 90 | cxy_t ref_cxy = GET_CXY( ref_xp );
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| 91 |
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| 92 | // compute root inode for path
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| 93 | if( kbuf[0] == '/' ) // absolute path
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| 94 | {
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| 95 | // use extended pointer on VFS root inode
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| 96 | root_inode_xp = process->vfs_root_xp;
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| 97 | }
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| 98 | else // relative path
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| 99 | {
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| 100 | // use extended pointer on CWD inode
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| 101 | root_inode_xp = hal_remote_l64( XPTR( ref_cxy , &ref_ptr->cwd_xp ) );
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| 102 | }
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| 103 |
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| 104 | // call the relevant VFS function
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| 105 | error = vfs_open( root_inode_xp,
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| 106 | kbuf,
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| 107 | ref_xp,
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| 108 | flags,
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| 109 | mode,
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| 110 | &file_xp,
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| 111 | &file_id );
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| 112 |
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| 113 | if( error )
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| 114 | {
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| 115 | printk("\n[ERROR] in %s : cannot create file descriptor for %s\n",
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| 116 | __FUNCTION__ , kbuf );
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| 117 | this->errno = ENFILE;
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| 118 | return -1;
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| 119 | }
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| 120 |
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| 121 | hal_fence();
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| 122 |
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| 123 | #if (DEBUG_SYS_OPEN || CONFIG_INSTRUMENTATION_SYSCALLS)
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| 124 | uint64_t tm_end = hal_get_cycles();
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| 125 | #endif
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| 126 |
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| 127 | #if DEBUG_SYS_OPEN
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| 128 | if( DEBUG_SYS_OPEN < tm_end )
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| 129 | printk("\n[%s] thread[%x,%x] exit for <%s> / cycle %d\n",
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| 130 | __FUNCTION__, process->pid, this->trdid, kbuf, (uint32_t)tm_end );
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| 131 | #endif
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| 132 |
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| 133 | #if CONFIG_INSTRUMENTATION_SYSCALLS
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| 134 | hal_atomic_add( &syscalls_cumul_cost[SYS_OPEN] , tm_end - tm_start );
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| 135 | hal_atomic_add( &syscalls_occurences[SYS_OPEN] , 1 );
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| 136 | #endif
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| 137 |
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| 138 | return file_id;
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| 139 | }
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