Rev 3 | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 2 | pj | 1 | |
| 1063 | tullio | 2 | /* |
| 3 | * This program is free software; you can redistribute it and/or modify |
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| 4 | * it under the terms of the GNU General Public License as published by |
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| 5 | * the Free Software Foundation; either version 2 of the License, or |
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| 6 | * (at your option) any later version. |
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| 7 | * |
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| 8 | * This program is distributed in the hope that it will be useful, |
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| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 11 | * GNU General Public License for more details. |
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| 12 | * |
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| 13 | * You should have received a copy of the GNU General Public License |
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| 14 | * along with this program; if not, write to the Free Software |
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| 15 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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| 16 | * |
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| 17 | */ |
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| 18 | |||
| 2 | pj | 19 | #include <fs/types.h> |
| 20 | #include <fs/errno.h> |
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| 21 | #include <fs/task.h> |
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| 22 | #include <fs/maccess.h> |
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| 23 | #include <fs/stat.h> |
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| 24 | #include <fs/fcntl.h> |
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| 25 | |||
| 26 | #include "fsconst.h" |
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| 27 | #include "file.h" |
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| 28 | #include "dentry.h" |
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| 29 | #include "inode.h" |
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| 30 | #include "fileop.h" |
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| 31 | #include "inodeop.h" |
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| 32 | #include "fs.h" |
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| 33 | |||
| 34 | #include "debug.h" |
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| 35 | |||
| 36 | int k_opendir(char *upathname) |
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| 37 | { |
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| 38 | declare_buffer(char,pathname,MAXPATHNAMELEN+1); |
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| 39 | int len; |
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| 40 | struct file *f; |
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| 41 | struct dentry *d; |
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| 42 | int res; |
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| 43 | int fd; |
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| 44 | __pid_t pid; |
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| 45 | |||
| 46 | call_to_fs(); |
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| 47 | |||
| 48 | printk4("k_opendir: START"); |
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| 49 | pid=__get_pid(); |
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| 50 | |||
| 51 | len=__verify_read_nolen((char*)upathname); |
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| 52 | if ((!len)||(len>MAXPATHNAMELEN)) return_from_fs(-EVERIFY); |
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| 53 | __copy_from_user(pathname,upathname,len+1); |
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| 54 | |||
| 55 | printk4("k_opendir: verifing memory... done"); |
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| 56 | |||
| 57 | d=find_dentry_from(cwden_ptr(pid),(char *)pathname); |
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| 58 | if (d==NULL) return_from_fs(-ENOENT); |
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| 59 | /* NB: a questo punto ci dovrebbe essere il check per le directory! */ |
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| 60 | if (!__S_ISDIR(d->d_inode->i_st.st_mode)) return_from_fs(-ENOENT); |
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| 61 | |||
| 62 | printk4("k_opendir: find dir entry... done"); |
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| 63 | |||
| 64 | /* NB: andrebbe cercato se questo file e' gia' in uso! */ |
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| 65 | f=get_file(NULL); |
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| 66 | if (f==NULL) { |
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| 67 | unlock_dentry(d); |
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| 68 | return_from_fs(-ENFILE); |
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| 69 | } |
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| 70 | |||
| 71 | printk4("k_open: getting system file entry... done"); |
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| 72 | |||
| 73 | f->f_dentry=d; |
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| 74 | f->f_op=d->d_inode->i_op->default_file_ops; |
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| 75 | f->f_pos=0; |
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| 76 | f->f_flag_isdir=1; |
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| 77 | |||
| 78 | fd=get_fd(pid,f); |
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| 79 | if (fd==-1) { |
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| 80 | free_file(f); |
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| 81 | unlock_dentry(d); |
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| 82 | return_from_fs(-EMFILE); |
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| 83 | } |
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| 84 | if ((void*)fd==NULL) { |
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| 85 | /* Well, we can't return a value that can be confused with NULL :-( */ |
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| 86 | int newfd; |
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| 87 | newfd=get_fd(pid,f); |
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| 88 | if (newfd==-1) { |
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| 89 | free_fd(pid,fd); |
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| 90 | free_file(f); |
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| 91 | unlock_dentry(d); |
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| 92 | return_from_fs(-EMFILE); |
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| 93 | } |
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| 94 | free_fd(pid,fd); |
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| 95 | fd=newfd; |
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| 96 | } |
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| 97 | |||
| 98 | printk4("k_open: getting file descriptor... done"); |
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| 99 | |||
| 100 | res=f->f_op->open(f->f_dentry->d_inode,f); |
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| 101 | if (res!=0) { |
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| 102 | free_fd(pid,fd); |
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| 103 | free_file(f); |
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| 104 | unlock_dentry(d); |
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| 105 | return_from_fs(res); |
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| 106 | } |
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| 107 | |||
| 108 | printk4("k_open: called proper filesystem open... done"); |
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| 109 | |||
| 110 | printk4("k_open: END"); |
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| 111 | return_from_fs(fd); |
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| 112 | } |