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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | CONFORMING TO | SEE ALSO | COLOPHON |
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IOCTL-XFS-AG-GEOMETRY(2) System Calls Manual IOCTL-XFS-AG-GEOMETRY(2)
ioctl_xfs_ag_geometry - query XFS allocation group geometry
information
#include <xfs/xfs_fs.h>
int ioctl(int fd, XFS_IOC_AG_GEOMETRY, struct xfs_ag_geometry
*arg);
This XFS ioctl retrieves the geometry information for a given
allocation group. The geometry information is conveyed in a
structure of the following form:
struct xfs_ag_geometry {
uint32_t ag_number;
uint32_t ag_length;
uint32_t ag_freeblks;
uint32_t ag_icount;
uint32_t ag_ifree;
uint32_t ag_sick;
uint32_t ag_checked;
uint32_t ag_flags;
uint64_t ag_reserved[12];
};
ag_number
The caller must set this field to the index of the
allocation group that the caller wishes to learn about.
ag_length
The length of the allocation group is returned in this
field, in units of filesystem blocks.
ag_freeblks
The number of free blocks in the allocation group is
returned in this field, in units of filesystem blocks.
ag_icount
The number of inode records allocated in this allocation
group is returned in this field.
ag_ifree
The number of unused inode records (of the space allocated)
in this allocation group is returned in this field.
ag_flags
The caller can set this field to change the operational
behavior of the ioctl. Currently no flags are defined, so
this field must be zero.
ag_reserved
All reserved fields will be set to zero on return.
The fields ag_sick and ag_checked indicate the relative health of
various allocation group metadata:
• If a given sick flag is set in ag_sick, then that piece of
metadata has been observed to be damaged. The same bit will be
set in ag_checked.
• If a given sick flag is set in ag_checked and is not set in
ag_sick, then that piece of metadata has been checked and is not
faulty.
• If a given sick flag is not set in ag_checked, then no
conclusion can be made.
The following flags apply to these fields:
XFS_AG_GEOM_SICK_SB
Allocation group superblock.
XFS_AG_GEOM_SICK_AGF
Free space header.
XFS_AG_GEOM_SICK_AGFL
Free space reserve list.
XFS_AG_GEOM_SICK_AGI
Inode header.
XFS_AG_GEOM_SICK_BNOBT or XFS_AG_GEOM_SICK_CNTBT
Free space btrees.
XFS_AG_GEOM_SICK_INOBT or XFS_AG_GEOM_SICK_FINOBT
Inode btrees.
XFS_AG_GEOM_SICK_RMAPBT
Reverse mapping btree.
XFS_AG_GEOM_SICK_REFCNTBT
Reference count btree.
On error, -1 is returned, and errno is set to indicate the error.
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.
This API is specific to XFS filesystem on the Linux kernel.
ioctl(2)
This page is part of the xfsprogs (utilities for XFS filesystems)
project. Information about the project can be found at
⟨http://xfs.org/⟩. If you have a bug report for this manual page,
send it to linux-xfs@vger.kernel.org. This page was obtained from
the project's upstream Git repository
⟨https://git.kernel.org/pub/scm/fs/xfs/xfsprogs-dev.git⟩ on
2025-08-11. (At that time, the date of the most recent commit
that was found in the repository was 2025-06-23.) If you discover
any rendering problems in this HTML version of the page, or you
believe there is a better or more up-to-date source for the page,
or you have corrections or improvements to the information in this
COLOPHON (which is not part of the original manual page), send a
mail to man-pages@man7.org
XFS 2019-08-30 IOCTL-XFS-AG-GEOMETRY(2)
Pages that refer to this page: xfsctl(3)
Copyright and license for this manual page
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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