tdisplay correct size of block devices for linux. that was surprisingly easy. - plan9port - [fork] Plan 9 from user space
HTML git clone git://src.adamsgaard.dk/plan9port
DIR Log
DIR Files
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DIR LICENSE
---
DIR commit 7317e77da344d1a5eff16e28771dcda91acd4ae3
DIR parent 840bb96866d382d3e4771ca8e81e1cb9aa37986c
HTML Author: rsc <devnull@localhost>
Date: Sun, 25 Apr 2004 22:24:56 +0000
display correct size of block devices for linux.
tthat was surprisingly easy.
Diffstat:
M src/lib9/_p9dir.c | 31 +++++++++++++++++++++++++++++--
1 file changed, 29 insertions(+), 2 deletions(-)
---
DIR diff --git a/src/lib9/_p9dir.c b/src/lib9/_p9dir.c
t@@ -1,7 +1,6 @@
#include <u.h>
#define NOPLAN9DEFINES
#include <libc.h>
-
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
t@@ -43,6 +42,28 @@ isdisk(struct stat *st)
#define _HAVEDISKLABEL
#endif
+#if defined(__linux__)
+#include <linux/hdreg.h>
+#include <linux/fs.h>
+#include <sys/ioctl.h>
+static vlong
+disksize(int fd, int dev)
+{
+ u64int u64;
+ long l;
+ struct hd_geometry geo;
+
+ if(ioctl(fd, BLKGETSIZE64, &u64) >= 0)
+ return u64;
+ if(ioctl(fd, BLKGETSIZE, &l) >= 0)
+ return l*512;
+ if(ioctl(fd, HDIO_GETGEO, &geo) >= 0)
+ return (vlong)geo.heads*geo.sectors*geo.cylinders*512;
+ return 0;
+}
+#define _HAVEDISKSIZE
+#endif
+
#if !defined(__linux__) && !defined(__sun__)
#define _HAVESTGEN
#endif
t@@ -61,7 +82,7 @@ _p9dir(struct stat *st, char *name, Dir *d, char **str, char *estr)
static struct group *g;
static struct passwd *p;
static int gid, uid;
- int sz;
+ int sz, fd;
sz = 0;
if(d)
t@@ -154,6 +175,12 @@ _p9dir(struct stat *st, char *name, Dir *d, char **str, char *estr)
}
/* fetch real size for disks */
+#ifdef _HAVEDISKSIZE
+ if((fd = open(name, O_RDONLY)) >= 0){
+ d->length = disksize(fd, major(st->st_dev));
+ close(fd);
+ }
+#endif
#ifdef _HAVEDISKLABEL
if(isdisk(st)){
int fd, n;