[Cluster-devel] [PATCH] mkfs: Handle gfs2 creation on regular files

[Andrew Price <anprice@redhat.com>]

mkfs.gfs2 previously exited if the target volume was a regular file.
This patch allows creation of gfs2 file systems on regular files by
removing an exiting check, guarding against calling device_topology()
and falling back to the default block size if the target is a regular
file. It also moves a stat() call out of check_mount() and into
main_mkfs() so that the result can be queried multiple times.

rhbz#719943

Signed-off-by: Andrew Price <anprice@redhat.com>
---
 gfs2/mkfs/main_mkfs.c |   16 ++++++++--------
 1 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/gfs2/mkfs/main_mkfs.c b/gfs2/mkfs/main_mkfs.c
index b0bb6e3..e24b284 100644
--- a/gfs2/mkfs/main_mkfs.c
+++ b/gfs2/mkfs/main_mkfs.c
@@ -483,14 +483,8 @@ static void are_you_sure(struct gfs2_sbd *sdp)
 
 static void check_mount(char *device)
 {
-	struct stat st_buf;
 	int fd;
 
-	if (stat(device, &st_buf) < 0)
-		die( _("could not stat device %s\n"), device);
-	if (!S_ISBLK(st_buf.st_mode))
-		die( _("%s is not a block device\n"), device);
-
 	fd = open(device, O_RDONLY | O_NONBLOCK | O_EXCL | O_CLOEXEC);
 
 	if (fd < 0) {
@@ -561,6 +555,7 @@ void main_mkfs(int argc, char *argv[])
 	int rgsize_specified = 0;
 	uint64_t real_device_size;
 	unsigned char uuid[16];
+	struct stat st_buf;
 
 	memset(sdp, 0, sizeof(struct gfs2_sbd));
 	sdp->bsize = -1;
@@ -579,6 +574,9 @@ void main_mkfs(int argc, char *argv[])
 
 	verify_arguments(sdp);
 
+	if (stat(sdp->device_name, &st_buf) < 0)
+		die( _("could not stat device %s\n"), sdp->device_name);
+
 	check_mount(sdp->device_name);
 
 	sdp->device_fd = open(sdp->device_name, O_RDWR | O_CLOEXEC);
@@ -589,15 +587,17 @@ void main_mkfs(int argc, char *argv[])
 	if (!sdp->override)
 		are_you_sure(sdp);
 
-	if (device_topology(sdp)) {
+	if (!S_ISREG(st_buf.st_mode) && device_topology(sdp)) {
 		fprintf(stderr, _("Device topology error\n"));
 		exit(-1);
 	}
 
 	if (sdp->bsize == -1) {
+		if (S_ISREG(st_buf.st_mode))
+			sdp->bsize = GFS2_DEFAULT_BSIZE;
 		/* See if optimal_io_size (the biggest I/O we can submit
 		   without incurring a penalty) is a suitable block size. */
-		if (sdp->optimal_io_size <= getpagesize() &&
+		else if (sdp->optimal_io_size <= getpagesize() &&
 		    sdp->optimal_io_size >= sdp->minimum_io_size)
 			sdp->bsize = sdp->optimal_io_size;
 		/* See if physical_block_size (the smallest unit we can write
-- 
1.7.6