[PATCH 2/3] xfs_io: add inode -l argument to return largest inode number

[Brian Foster]

On Fri, Sep 25, 2015 at 03:07:46PM +0200, Carlos Maiolino wrote:
> Implements '-l' argument in inode command, returning to the user, the largest
> inode allocated and used in the filesystem.
> 
> Signed-off-by: Carlos Maiolino <cmaiolino at redhat.com>
> ---
>  io/open.c | 18 +++++++++++++-----
>  1 file changed, 13 insertions(+), 5 deletions(-)
> 
> diff --git a/io/open.c b/io/open.c
> index 6a794ba..57ff0bf 100644
> --- a/io/open.c
> +++ b/io/open.c
> @@ -759,6 +759,7 @@ inode_help(void)
>  "\n"
>  "Query physical information about the inode"
>  "\n"
> +" -l	-- Returns the largest inode number in the filesystem\n"
>  " -s	-- Returns the physical size (in bits) of the\n"
>  "	   largest inode number in the filesystem\n"
>  "\n"));
> @@ -777,23 +778,27 @@ inode_f(
>  	struct xfs_fsop_bulkreq	bulkreq;
>  	int			c;
>  	int			ret_lsize = 0;
> +	int			ret_largest = 0;
>  
>  	bulkreq.lastip = &last;
>  	bulkreq.icount = 1024; /* maybe an user-defined value!? */
>  	bulkreq.ubuffer = &igroup;
>  	bulkreq.ocount = &count;
>  
> -	while ((c = getopt(argc, argv, "s")) != EOF) {
> +	while ((c = getopt(argc, argv, "sl")) != EOF) {
>  		switch (c) {
>  		case 's':
>  			ret_lsize = 1;
>  			break;
> +		case 'l':
> +			ret_largest = 1;
> +			break;
>  		default:
>  			return command_usage(&inode_cmd);
>  		}
>  	}
>  
> -	if (ret_lsize) {
> +	if (ret_lsize || ret_largest) {
>  		for (;;) {
>  			if (xfsctl(file->name, file->fd, XFS_IOC_FSINUMBERS,
>  					&bulkreq)) {
> @@ -811,8 +816,11 @@ inode_f(
>  		lastino = igroup[lastgrp].xi_startino +
>  			  xfs_highbit64(igroup[lastgrp].xi_allocmask);
>  
> -		printf (_("Largest inode size: %d\n"),
> -			 lastino > XFS_MAXINUMBER_32 ? 64 : 32);
> +		if (ret_lsize)
> +			printf (_("Largest inode size: %d\n"),
> +				lastino > XFS_MAXINUMBER_32 ? 64 : 32);
> +		else
> +			printf(_("Largest inode: %llu\n"), lastino);

Hmm, do we need the -s option if we have -l to print the actual largest
inode number?

Brian

>  
>  	}
>  
> @@ -887,7 +895,7 @@ open_init(void)
>  
>  	inode_cmd.name = "inode";
>  	inode_cmd.cfunc = inode_f;
> -	inode_cmd.args = _("[-s]");
> +	inode_cmd.args = _("[-s | -l]");
>  	inode_cmd.argmin = 1;
>  	inode_cmd.argmax = 1;
>  	inode_cmd.flags = CMD_NOMAP_OK;
> -- 
> 2.4.3
> 
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