On Thu, Feb 18, 2016 at 05:49:19PM +0100, Carlos Maiolino wrote:
> Implements a new xfs_io command, named 'inode', which is supposed to be
> used to query information about inode's existence and its physical size
> in the filesystem.
>
> Supported options:
>
> Default: -- Return true(1) or false(0) if any inode greater than
> 32bits has been found in the filesystem
> [num] -- Return inode number or 0 if the inode [num] is in use
> -n [num] -- Return the next valid inode after [num]
> -v -- verbose mode
> Display the inode number and its physical size according to the
> argument used
>
> No manpage sent because there were changes in the supported options and its
> descriptions.
> I'll send the manpage after the options and descriptions are reviewed.
>
> - Changelog
>
> V3:
> - Merge all 3 patches from the V2 together in a single patch
> - Rework of '-n [num]' and 'num' only arguments algorithm
> - Argument -n now relies on bulkreq.count to check for next inodes, not
> on bstat.bs_ino anymore.
> - for loop in ret_lsize or ret_largest case, now relies on count being 0
> to break the loop
>
> V4:
> - Refactor inode_f function to reduce its size and easier logic
> - Implement error handlers for invalid command combination (hopefully
> all invalid combinations).
> - use a single xfs_inogrp array for keep track of inodes
> - Fix missing newline in inode_help()
> - Rewrite help message in inode_help()
> - Fix indentation
>
> V5:
> - Reduce the amount of options
> - remove igrp_rec variable, and use igroup[lastgrp] directly to get
> information from the last inode groups returned by ioctl
>
> V6:
> - Re-use userino variable to reduce code duplication for command output
> - Use verbose option as an extension to another commands
> - report usage message when -n option is passed stand-alone
> - Refactor command outputs
> - Add a few comments to the code
>
> Signed-off-by: Carlos Maiolino <cmaiolino@xxxxxxxxxx>
> ---
> io/open.c | 150 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 150 insertions(+)
>
> diff --git a/io/open.c b/io/open.c
> index 037843d..5e607f1 100644
...
> +
> +static int
> +inode_f(
> + int argc,
> + char **argv)
> +{
...
> +
> + /*
> + * Inode number can be passed with or without extra arguments, so we
> + * should handle inode numbers passed by user out of getopt()
> + */
> + if (optind < argc) {
> +
> + if (ret_next) {
> + cmd = XFS_IOC_FSBULKSTAT;
> + } else {
> + if (argc > 2)
> + return command_usage(&inode_cmd);
FYI, this means one can't do the following:
xfs_io -c "inode -v 123" <mnt>
Otherwise it looks good to me:
Reviewed-by: Brian Foster <bfoster@xxxxxxxxxx>
> + else
> + cmd = XFS_IOC_FSBULKSTAT_SINGLE;
> + }
> +
> + userino = strtoull(argv[optind], &p, 10);
> + if ((*p != '\0')) {
> + printf(_("[num] must be a numeric value\n"));
> + exitcode = 1;
> + return 0;
> + }
> +
> + bulkreq.lastip = &userino;
> + bulkreq.icount = 1;
> + bulkreq.ubuffer = &bstat;
> + bulkreq.ocount = &count;
> +
> + if (xfsctl(file->name, file->fd, cmd, &bulkreq)) {
> + if (errno == EINVAL) {
> + if (!ret_next)
> + printf("0\n");
> + } else {
> + perror("xfsctl");
> + }
> + exitcode = 1;
> + return 0;
> + }
> +
> + if (ret_next)
> + userino = bstat.bs_ino;
> +
> + if (verbose)
> + printf("%llu:%d\n",
> + userino,
> + userino > XFS_MAXINUMBER_32 ? 64 : 32);
> + else
> + /* Inode in use */
> + printf("%llu\n", userino);
> + return 0;
> +
> + /* -n option must not be used stand alone */
> + } else if (ret_next) {
> + return command_usage(&inode_cmd);
> + }
> +
> + bulkreq.lastip = &last;
> + bulkreq.icount = 1024; /* User-defined maybe!? */
> + bulkreq.ubuffer = &igroup;
> + bulkreq.ocount = &count;
> +
> + for (;;) {
> + if (xfsctl(file->name, file->fd, XFS_IOC_FSINUMBERS,
> + &bulkreq)) {
> + perror("XFS_IOC_FSINUMBERS");
> + exitcode = 1;
> + return 0;
> + }
> +
> + if (count == 0)
> + break;
> +
> + lastgrp = count;
> + }
> +
> + lastgrp--;
> + lastino = igroup[lastgrp].xi_startino +
> + xfs_highbit64(igroup[lastgrp].xi_allocmask);
> +
> + if (verbose)
> + printf("%llu:%d\n", lastino,
> + lastino > XFS_MAXINUMBER_32 ? 64 : 32);
> + else
> + printf("%d\n", lastino > XFS_MAXINUMBER_32 ? 1 : 0);
> +
> + return 0;
> +}
> +
> void
> open_init(void)
> {
> @@ -815,6 +954,16 @@ 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 = _("[-n | -v] [num]");
> + inode_cmd.argmin = 0;
> + inode_cmd.argmax = 2;
> + 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 +971,5 @@ 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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