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#include <stddef.h>
#include "kernel.h"
#include "mount.h"
#include "log.h"
#include "lib/string/string.h"
#include "lib/printf/printf.h"
#include "fd.h"
static mount mounts[MAX_MOUNTS];
static uint32_t mounts_count=0;
char *mount_type_to_str(uint32_t t)
{
switch(t)
{
case MOUNT_TYPE_EXT2: return "EXT2";
// case MOUNT_TYPE_PIPES: return "PIPES";
case MOUNT_TYPE_SYS: return "SYSFS";
}
return "UNKNOWN";
}
void mount_add(mount mnt)
{
if(mounts_count==MAX_MOUNTS)kpanic("maxium number of mounts exceeded. increase MAX_MOUNTS in kernel.h and recomplie kernel.");
mounts[mounts_count++]=mnt;
klog("Mounted %s at %s",mount_type_to_str(mnt.type),mnt.path);
}
void mount_sysfs(ringbuffer *r, void (*f)(ringbuffer *r,char *fmt, ...))
{
for(int i=0;i<mounts_count;i++)
{
mount *m=&mounts[i];
f(r,"%s at %s",mount_type_to_str(m->type),m->path);
}
}
static uint32_t check_match(char *p1, char *p2)
{
uint32_t c=0;
while(1)
{
if(*p1==0||*p2==0||*p1!=*p2)return c;
c++;
p1++;
p2++;
if(*p1=='/')return c;
}
}
/**
* Find the mountpoint correspoding with the given path and return in _mnt_ parameter.
* The return value points to the input path with chopped of prefix indicating the mount itself.
* returns 0 if mount not found.
*/
static char* get_mount_for_path(char *path,mount *mnt)
{
// start with root as default
uint32_t best=0;
uint32_t best_len=1;
if(path[0]!='/'){
kpanic("this works only for absolute paths! supplied: %s",path);
}
for(int i=0;i<mounts_count;i++)
{
mount *m=&mounts[i];
uint32_t len=check_match(path+1,(m->path)+1);
if(len>best_len&&path[len-1]=='/')//&&len==strlen(m->path))
{
best=i;
best_len=len;
}
}
*mnt=mounts[best];
return path+best_len-1;
}
fd mount_file_open(char *path)
{
mount m;
char buf[256];
if(path[0]!='/'){
// we extract the PWD env variable!
// TODO: this is ugly!
char **env1=VMEM_USER_ENV+1024*2;
int i=0;
while(1)
{
if(env1[i]==0)kpanic("unable to extract PWD!");
if(!strcmp_l("PWD=",env1[i],4))
{
sprintf(buf,"%s/%s",env1[i]+4,path);
klog("absolute path exracted: %s",buf);
break;
}
i++;
}
}
else
{
sprintf(buf,"%s",path);
}
char *p=get_mount_for_path(buf,&m);
return m.mount_file_open(&m,p);
}
int mount_read_dir (char *path, struct dirent *dirs, uint32_t *pos)
{
mount m;
char *p=get_mount_for_path(path,&m);
return m.mount_read_dir(&m,p,dirs,pos);
}
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