1 /*********************************************************************** 2 * * 3 * This software is part of the ast package * 4 * Copyright (c) 1985-2009 AT&T Intellectual Property * 5 * and is licensed under the * 6 * Common Public License, Version 1.0 * 7 * by AT&T Intellectual Property * 8 * * 9 * A copy of the License is available at * 10 * http://www.opensource.org/licenses/cpl1.0.txt * 11 * (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * 12 * * 13 * Information and Software Systems Research * 14 * AT&T Research * 15 * Florham Park NJ * 16 * * 17 * Glenn Fowler <gsf@research.att.com> * 18 * David Korn <dgk@research.att.com> * 19 * Phong Vo <kpv@research.att.com> * 20 * * 21 ***********************************************************************/ 22 #pragma prototyped 23 24 /* 25 * Glenn Fowler 26 * AT&T Bell Laboratories 27 * 28 * return fs type string given stat 29 */ 30 31 #include <ast.h> 32 #include <ls.h> 33 #include <mnt.h> 34 35 #include "FEATURE/fs" 36 37 #if _str_st_fstype 38 39 char* 40 fmtfs(struct stat* st) 41 { 42 return st->st_fstype; 43 } 44 45 #else 46 47 #include <cdt.h> 48 49 typedef struct Id_s 50 { 51 Dtlink_t link; 52 dev_t id; 53 char name[1]; 54 } Id_t; 55 56 char* 57 fmtfs(struct stat* st) 58 { 59 register Id_t* ip; 60 register void* mp; 61 register Mnt_t* mnt; 62 register char* s; 63 struct stat rt; 64 char* buf; 65 66 static Dt_t* dict; 67 static Dtdisc_t disc; 68 69 if (!dict) 70 { 71 disc.key = offsetof(Id_t, id); 72 disc.size = sizeof(dev_t); 73 dict = dtopen(&disc, Dthash); 74 } 75 else if (ip = (Id_t*)dtmatch(dict, &st->st_dev)) 76 return ip->name; 77 s = FS_default; 78 if (mp = mntopen(NiL, "r")) 79 { 80 while ((mnt = mntread(mp)) && (stat(mnt->dir, &rt) || rt.st_dev != st->st_dev)); 81 if (mnt && mnt->type) 82 s = mnt->type; 83 } 84 if (!dict || !(ip = newof(0, Id_t, 1, strlen(s)))) 85 { 86 if (!mp) 87 return s; 88 buf = fmtbuf(strlen(s) + 1); 89 strcpy(buf, s); 90 mntclose(mp); 91 return buf; 92 } 93 strcpy(ip->name, s); 94 if (mp) 95 mntclose(mp); 96 dtinsert(dict, ip); 97 return ip->name; 98 } 99 100 #endif 101