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started own cowfs implementation

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This commit is contained in:
Martin Willi
2007-07-31 15:23:23 +00:00
parent ebd9ef27c3
commit f8afabcac3
4 changed files with 488 additions and 29 deletions
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src/dumm/guest.c
+21 -27
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@@ -31,6 +31,7 @@
#include "dumm.h"
#include "guest.h"
#include "mconsole.h"
#include "cowfs.h"
#define PERME (S_IRWXU | S_IRWXG)
#define PERM (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP)
@@ -54,8 +55,8 @@ struct private_guest_t {
guest_state_t state;
/** log file for console 0 */
int bootlog;
/** has the unionfs been mounted */
bool mounted;
/** FUSE cowfs instance */
cowfs_t *cowfs;
/** mconsole to control running UML */
mconsole_t *mconsole;
/** list of interfaces attached to the guest */
@@ -259,21 +260,13 @@ static void sigchild(private_guest_t *this)
*/
static bool umount_unionfs(private_guest_t *this)
{
char cmd[128];
size_t len;
if (this->mounted)
if (this->cowfs)
{
len = snprintf(cmd, sizeof(cmd), "fusermount -u %s/%s",
this->dirname, UNION_DIR);
if (len < 0 || len >= sizeof(cmd) || system(cmd) != 0)
{
DBG1("unmounting guest unionfs failed");
return FALSE;
}
this->mounted = FALSE;
this->cowfs->destroy(this->cowfs);
this->cowfs = NULL;
return TRUE;
}
return TRUE;
return FALSE;
}
/**
@@ -281,22 +274,23 @@ static bool umount_unionfs(private_guest_t *this)
*/
static bool mount_unionfs(private_guest_t *this)
{
char cmd[256];
size_t len;
char master[PATH_MAX];
char diff[PATH_MAX];
char mount[PATH_MAX];
if (!this->mounted)
snprintf(master, sizeof(master), "%s/%s", this->dirname, MASTER_DIR);
snprintf(diff, sizeof(diff), "%s/%s", this->dirname, DIFF_DIR);
snprintf(mount, sizeof(mount), "%s/%s", this->dirname, UNION_DIR);
if (this->cowfs == NULL)
{
len = snprintf(cmd, sizeof(cmd), "unionfs %s/%s:%s/%s %s/%s",
this->dirname, MASTER_DIR, this->dirname, DIFF_DIR,
this->dirname, UNION_DIR);
if (len < 0 || len >= sizeof(cmd) || system(cmd) != 0)
this->cowfs = cowfs_create(master, diff, mount);
if (this->cowfs)
{
DBG1("mounting guest unionfs failed");
return FALSE;
return TRUE;
}
this->mounted = TRUE;
}
return TRUE;
return FALSE;
}
/**
@@ -423,7 +417,7 @@ static private_guest_t *guest_create_generic(char *parent, char *name,
this->mem = 0;
this->bootlog = open_bootlog(this);
this->name = strdup(name);
this->mounted = FALSE;
this->cowfs = NULL;
return this;
}