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- Log -----------------------------------------------------------------
commit f6a63c92a24b867347491ba90fc1a80256efc08c
Author: Ryan O'Hara <rohara@redhat.com>
Date: Fri Jul 25 14:38:13 2008 -0500

gfs_mkfs: change the way we check to see if a device is mounted

New method will attempt to open device with O_EXCL flag. If open()
responds with EBUSY, mkfs will die. This indicates that the device
is either mounted or part of a LVM volume. (BZ #426298)

-----------------------------------------------------------------------

Summary of changes:
gfs/gfs_mkfs/main.c | 29 +++++++++++++++--------------
1 files changed, 15 insertions(+), 14 deletions(-)

diff --git a/gfs/gfs_mkfs/main.c b/gfs/gfs_mkfs/main.c
index 0dc75b4..87316c7 100644
--- a/gfs/gfs_mkfs/main.c
+++ b/gfs/gfs_mkfs/main.c
@@ -229,30 +229,31 @@ void are_you_sure(commandline_t *comline)


/**
- * check_mount -
+ * check_mount - check to see if device is mounted/busy
* @
*
*/

void check_mount(char *device)
{
- struct mntent *mnt;
- FILE *fp;
+ struct stat st_buf;
+ int fd;

- if ((fp = setmntent("/proc/mounts", "r")) == NULL) {
- die("error opening /proc/mounts");
- }
+ if (stat(device, &st_buf) < 0)
+ die("could not stat device %s
", device);
+ if (!S_ISBLK(st_buf.st_mode))
+ die("%s is not a block device
", device);
+
+ fd = open(device, O_RDONLY | O_NONBLOCK | O_EXCL);

- while ((mnt = getmntent(fp)) != NULL) {
- if (strcmp(device, mnt->mnt_fsname) == 0) {
- printf("cannot create filesystem: ");
- printf("%s appears to be mounted
", device);
- endmntent(fp);
- exit(EXIT_FAILURE);
+ if (fd < 0) {
+ if (errno == EBUSY) {
+ die("device %s is busy
", device);
}
}
-
- endmntent(fp);
+ else {
+ close(fd);
+ }

return;
}


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