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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | CONFORMING TO | SEE ALSO | COLOPHON |
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IOCTL-XFS-GETRESBLKS(2) System Calls Manual IOCTL-XFS-GETRESBLKS(2)
ioctl_xfs_getresblks - query and set XFS free space reservation
information
#include <xfs/xfs_fs.h>
int ioctl(int fd, XFS_IOC_GET_RESBLKS, struct xfs_fsop_resblks
*arg);
int ioctl(int fd, XFS_IOC_SET_RESBLKS, struct xfs_fsop_resblks
*arg);
Query or set the free space reservation information. These blocks
are reserved by the filesystem as a final attempt to prevent
metadata update failures due to insufficient space. Only the
system administrator can use these ioctls, because overriding the
defaults is extremely dangerous.
This functionality is intended only for use by XFS filesystem
developers.
The reservation information is conveyed in a structure of the
following form:
struct xfs_fsop_resblks {
__u64 resblks;
__u64 resblks_avail;
};
resblks is the number of blocks that the filesystem will try to
maintain to prevent critical out of space situations.
resblks_avail is the number of reserved blocks remaining.
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.
EPERM Caller does not have permission to call this ioctl.
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 2019-06-17 IOCTL-XFS-GETRESBLKS(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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