[PATCH 1/3] xfs_io: Add inode '-s' command to query physical size of largest inode

[Carlos Maiolino]

On Fri, Sep 25, 2015 at 03:07:45PM +0200, Carlos Maiolino wrote:
> Add a new inode command to xfs_io, which aims to implement a tool for query
> information about inode usage of the filesystem.
> 
> This patch implements '-s' inode option, which query the filesystem for the
> physical size of the largest filesystem inode
> 
> Signed-off-by: Carlos Maiolino <cmaiolino at redhat.com>
> ---
>  io/open.c | 81 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 81 insertions(+)
> 
> diff --git a/io/open.c b/io/open.c
> index ac5a5e0..6a794ba 100644
> --- a/io/open.c
> +++ b/io/open.c
> @@ -20,6 +20,7 @@
>  #include "input.h"
>  #include "init.h"
>  #include "io.h"
> +#include "libxfs.h"
>  
>  #ifndef __O_TMPFILE
>  #if defined __alpha__
> @@ -44,6 +45,7 @@ static cmdinfo_t statfs_cmd;
>  static cmdinfo_t chproj_cmd;
>  static cmdinfo_t lsproj_cmd;
>  static cmdinfo_t extsize_cmd;
> +static cmdinfo_t inode_cmd;
>  static prid_t prid;
>  static long extsize;
>  
> @@ -750,6 +752,74 @@ statfs_f(
>  	return 0;
>  }
>  
> +static void
> +inode_help(void)
> +{
> +	printf(_(
> +"\n"
> +"Query physical information about the inode"
> +"\n"
> +" -s	-- Returns the physical size (in bits) of the\n"
> +"	   largest inode number in the filesystem\n"
> +"\n"));
> +}
> +
> +static int
> +inode_f(
> +	  int			argc,
> +	  char			**argv)
> +{
> +	__s32			count = 0;
> +	__s32			lastgrp = 0;
> +	__u64			last = 0;
> +	__u64			lastino = 0;
> +	struct xfs_inogrp	igroup[1024];
> +	struct xfs_fsop_bulkreq	bulkreq;
> +	int			c;
> +	int			ret_lsize = 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) {
> +		switch (c) {
> +		case 's':
> +			ret_lsize = 1;
> +			break;
> +		default:
> +			return command_usage(&inode_cmd);
> +		}
> +	}
> +
> +	if (ret_lsize) {
> +		for (;;) {
> +			if (xfsctl(file->name, file->fd, XFS_IOC_FSINUMBERS,
> +					&bulkreq)) {
> +				perror("XFS_IOC_FSINUMBERS");
> +				exitcode = 1;
> +				return 0;
> +			}
> +			if (count < XFS_INODES_PER_CHUNK && count > 0)
					^^^ bummer :( I forgot to remove this
					macro before commiting this patch, it
					has been changed to 1024 in the patch 3/3
					will fix this up before sending V3,
					after getting more reviews on these patches

> +				lastgrp = count;
> +			if (!count)
> +				break;
> +		}
> +
> +		lastgrp--;
> +		lastino = igroup[lastgrp].xi_startino +
> +			  xfs_highbit64(igroup[lastgrp].xi_allocmask);
> +
> +		printf (_("Largest inode size: %d\n"),
> +			 lastino > XFS_MAXINUMBER_32 ? 64 : 32);
> +
> +	}
> +
> +
> +	return 0;
> +}
> +
>  void
>  open_init(void)
>  {
> @@ -815,6 +885,16 @@ open_init(void)
>  		_("get/set preferred extent size (in bytes) for the open file");
>  	extsize_cmd.help = extsize_help;
>  
> +	inode_cmd.name = "inode";
> +	inode_cmd.cfunc = inode_f;
> +	inode_cmd.args = _("[-s]");
> +	inode_cmd.argmin = 1;
> +	inode_cmd.argmax = 1;
> +	inode_cmd.flags = CMD_NOMAP_OK;
> +	inode_cmd.oneline =
> +		_("Query inode number usage in the filesystem");
> +	inode_cmd.help = inode_help;
> +
>  	add_command(&open_cmd);
>  	add_command(&stat_cmd);
>  	add_command(&close_cmd);
> @@ -822,4 +902,5 @@ open_init(void)
>  	add_command(&chproj_cmd);
>  	add_command(&lsproj_cmd);
>  	add_command(&extsize_cmd);
> +	add_command(&inode_cmd);
>  }
> -- 
> 2.4.3
> 
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-- 
Carlos