NAME

       ioctl_xfs_fscounts - query XFS summary counter information

SYNOPSIS

       #include <xfs/xfs_fs.h>

       int ioctl(int fd, XFS_IOC_FSCOUNTS, struct xfs_fsop_counts *arg);

DESCRIPTION

       Query  the  raw  filesystem summary counters.  Unlike statvfs(3), the values returned here
       are the raw values, which do not reflect any alterations or limits set by project  quotas.
       The counter information is conveyed in a structure of the following form:

           struct xfs_fsop_counts {
                __u64   freedata;
                __u64   freertx;
                __u64   freeino;
                __u64   allocino;
           };

       The fields of this structure are as follows:

       freedata is the number of free filesystem blocks on the data device.

       freertx is the number of free extents on the realtime device.

       freeino  is the number of inode records that are not in use within the space that has been
       allocated for them.

       allocino is the number of inode records for which space has been allocated.

RETURN VALUE

       On error, -1 is returned, and errno is set to indicate the error.

ERRORS

       Error codes can be one of, but are not limited to, the following:

       EFSBADCRC
              Metadata checksum validation failed while performing the query.

       EFSCORRUPTED
              Metadata corruption was encountered while performing the query.

       EINVAL The specified allocation group number is not valid for this filesystem.

       EIO    An I/O error was encountered while performing the query.

CONFORMING TO

       This API is specific to XFS filesystem on the Linux kernel.

SEE ALSO

       ioctl(2)