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Try to get parent device via sysfs, and rollback to old heuristic if sysfs unavailable. #2

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Try to get parent device via sysfs, and rollback to old heuristic if sysfs unavailable. #2

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58 changes: 44 additions & 14 deletions ptmax.c
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Original file line number Diff line number Diff line change
Expand Up @@ -12,7 +12,6 @@
*
*/


#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
Expand Down Expand Up @@ -152,19 +151,50 @@ void print_pt()

char* get_parent(const char* path)
{
/*we supports only for pirmary partitions, feel free to add more*/
int l=strlen(path)-1;
char *newpath;
if (path[l]<'1' || path[l] >'4')
return NULL;
// For /dev/cciss/c0d0p0 we should cut "p0", not only "0"
if (strstr(path, "/cciss/")!=NULL && path[l-1]=='p')
l--;
newpath=malloc(l);
assert(newpath);
memcpy(newpath,path,l);
return newpath;

/* try to find parent device name via sysfs */
if (strstr(path, "/dev/")==path) {
int len=strlen(path)-5;
char name[PATH_MAX] = "/sys/class/block/";
char *t;
const char *p;
for(t = name+strlen(name), p = path+5; *p; p++,t++) {
if(*p == '/') *t = '!';
else *t = *p;
}
if(readlink(name, name, sizeof(name))>0) {
char *suf = name+strlen(name);
while(suf>=name && *suf != '/') suf--;
if(suf > name) {
char *end = suf--;
while(suf>=name && *suf != '/') suf--;
if(suf > name) {
char * newpath = malloc(5/*"/dev/"*/+(end-suf)+1);
strcpy(newpath, "/dev/");
for(t=newpath+5/*"/dev/"*/, suf++; *suf && *suf!='/'; suf++,t++) {
if(*suf == '!') *t = '/';
else *t = *suf;
}
*t = 0;
return newpath;
}
}
}
}
/* else try to find parent device using guess */
{
/*we supports only for pirmary partitions, feel free to add more*/
int l=strlen(path)-1;
char *newpath;
if (path[l]<'1' || path[l] >'4')
return NULL;
// For /dev/cciss/c0d0p0 we should cut "p0", not only "0"
if (strstr(path, "/cciss/")!=NULL && path[l-1]=='p')
l--;
newpath=malloc(l);
assert(newpath);
memcpy(newpath,path,l);
return newpath;
}
}

int is_valid(int num)
Expand Down