dir.c (4158B)
1 /* $Id: //depot/blt/srv/vfs/drivers/ffs/dir.c#3 $ 2 ** 3 ** Copyright 1999 Sidney Cammeresi 4 ** All rights reserved. 5 ** 6 ** Redistribution and use in source and binary forms, with or without 7 ** modification, are permitted provided that the following conditions 8 ** are met: 9 ** 1. Redistributions of source code must retain the above copyright 10 ** notice, this list of conditions, and the following disclaimer. 11 ** 2. Redistributions in binary form must reproduce the above copyright 12 ** notice, this list of conditions, and the following disclaimer in the 13 ** documentation and/or other materials provided with the distribution. 14 ** 3. The name of the author may not be used to endorse or promote products 15 ** derived from this software without specific prior written permission. 16 ** 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 19 ** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 ** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 ** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 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 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 26 ** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <stdio.h> 30 #include <stdlib.h> 31 #include <string.h> 32 #include <dirent.h> 33 #include "vfs-int.h" 34 35 #ifndef VFS_SANDBOX 36 #include <blt/blkdev.h> 37 #else 38 #include "../../sandbox/blkdev.h" 39 #endif 40 41 #include "ffs.h" 42 #include "ffs-blt.h" 43 #include "dinode.h" 44 #include "dir.h" 45 46 int ffs_opendir (struct vnode *dir, void **cookie) 47 { 48 char *buf; 49 int i, j, offset; 50 struct vfs_dirent_node *head, *p; 51 struct ffs_super *fs; 52 struct ffs_super_data *data; 53 struct ffs_dinode *di; 54 struct ffs_dircookie *fc; 55 struct ffs_direct *direct; 56 57 #ifdef FFS_DEBUG 58 printf ("ffs_opendir %lld\n", dir->v_vnid); 59 #endif 60 61 head = NULL; 62 data = dir->v_sb->sb_data; 63 fs = data->sbbuf; 64 di = dir->v_data; 65 buf = malloc (BLKSIZE); 66 for (i = 0; i < NDADDR; i++) 67 if (di->di_db[i]) 68 { 69 blk_read (data->dev, buf, fsbtodb (fs, di->di_db[i]), 70 BLKSIZE / data->dev->blksize); 71 for (j = offset = 0; offset < BLKSIZE; offset += direct->d_reclen) 72 { 73 direct = (struct ffs_direct *) (buf + offset); 74 if (!direct->d_ino) 75 break; 76 //printf ("opendir %s %d %d\n", direct->d_name, offset, j++); 77 //if (j > 10) for (;;) ; 78 p = malloc (sizeof (struct vfs_dirent_node)); 79 p->dirent = malloc (sizeof (struct dirent)); 80 p->dirent->d_fileno = direct->d_ino; 81 p->dirent->d_reclen = sizeof (struct dirent); 82 strncpy (p->dirent->d_name, direct->d_name, 83 sizeof (p->dirent->d_name)); 84 p->next = head; 85 head = p; 86 } 87 } 88 for (i = 0; i < NIADDR; i++) 89 if (di->di_ib[i]) 90 { 91 } 92 free (buf); 93 fc = malloc (sizeof (struct ffs_dircookie)); 94 fc->head = fc->current = head; 95 *cookie = fc; 96 return 0; 97 } 98 99 void ffs_closedir (struct vnode *dir, void *cookie) 100 { 101 #ifdef FFS_DEBUG 102 printf ("ffs_closedir %lld\n", dir->v_vnid); 103 #endif 104 } 105 106 void ffs_free_dircookie (void *cookie) 107 { 108 struct ffs_dircookie *fc; 109 110 #ifdef FFS_DEBUG 111 printf ("ffs_freedircookie\n"); 112 #endif 113 fc = cookie; 114 while (fc->head != NULL) 115 { 116 fc->current = fc->head->next; 117 free (fc->head); 118 fc->head = fc->current; 119 } 120 free (fc); 121 } 122 123 int ffs_rewinddir (struct vnode *dir, void *cookie) 124 { 125 struct ffs_dircookie *fc; 126 127 #ifdef FFS_DEBUG 128 printf ("ffs_rewinddir %lld\n", dir->v_vnid); 129 #endif 130 fc = cookie; 131 fc->current = fc->head; 132 return 0; 133 } 134 135 int ffs_readdir (struct vnode *dir, struct dirent *dirent, void *cookie) 136 { 137 struct dirent *orig; 138 struct ffs_dircookie *fc; 139 140 #ifdef FFS_DEBUG 141 //printf ("ffs_readdir %lld\n", dir->v_vnid); 142 #endif 143 fc = cookie; 144 if (fc->current == NULL) 145 return 1; 146 orig = fc->current->dirent; 147 dirent->d_fileno = orig->d_fileno; 148 dirent->d_reclen = orig->d_reclen; 149 strncpy (dirent->d_name, orig->d_name, MAXNAMLEN); 150 fc->current = fc->current->next; 151 return 0; 152 } 153