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Re: [Cluster-devel] [PATCH v2] mkfs: Handle gfs2 creation on regular files



Hi,

On Mon, 2011-07-11 at 17:09 +0100, Andrew Price wrote:
> 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 removes the check_mount() function and replaces it with an
> fstat() call after opening the file to avoid races.
> 
> rhbz#719943
> 
That looks good. Thanks for fixing that up,

Steve.

> Signed-off-by: Andrew Price <anprice redhat com>
> ---
>  gfs2/mkfs/main_mkfs.c |   45 +++++++++++----------------------------------
>  1 files changed, 11 insertions(+), 34 deletions(-)
> 
> diff --git a/gfs2/mkfs/main_mkfs.c b/gfs2/mkfs/main_mkfs.c
> index b0bb6e3..eaf2aa2 100644
> --- a/gfs2/mkfs/main_mkfs.c
> +++ b/gfs2/mkfs/main_mkfs.c
> @@ -476,36 +476,6 @@ static void are_you_sure(struct gfs2_sbd *sdp)
>  }
>  
>  /**
> - * check_mount - check to see if device is mounted/busy
> - * @device: the device to create the filesystem on
> - *
> - */
> -
> -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) {
> -		if (errno == EBUSY) {
> -			die( _("device %s is busy\n"), device);
> -		}
> -	}
> -	else {
> -		close(fd);
> -	}
> -
> -	return;
> -}
> -
> -/**
>   * print_results - print out summary information
>   * @sdp: the command line
>   *
> @@ -561,6 +531,7 @@ 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;
> @@ -579,25 +550,31 @@ void main_mkfs(int argc, char *argv[])
>  
>  	verify_arguments(sdp);
>  
> -	check_mount(sdp->device_name);
> -
>  	sdp->device_fd = open(sdp->device_name, O_RDWR | O_CLOEXEC);
>  	if (sdp->device_fd < 0)
>  		die( _("can't open device %s: %s\n"),
>  		    sdp->device_name, strerror(errno));
>  
> +	if (fstat(sdp->device_fd, &st_buf) < 0) {
> +		fprintf(stderr, _("could not fstat fd %d: %s\n"),
> +			sdp->device_fd, strerror(errno));
> +		exit(-1);
> +	}
> +
>  	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



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