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-IOCTL-XFS-INUMBERS(2) System Calls Manual IOCTL-XFS-INUMBERS(2)
-
-
-
-NAME
- ioctl_xfs_inumbers - query allocation information for groups of XFS
- inodes
-
-SYNOPSIS
- #include <xfs/xfs_fs.h>
-
- int ioctl(int fd, XFS_IOC_INUMBERS, struct xfs_inumbers_req *arg);
-
-DESCRIPTION
- Query inode allocation information for groups of XFS inodes. This
- ioctl uses struct xfs_inumbers_req to set up a bulk transfer from the
- kernel:
-
- struct xfs_inumbers_req {
- struct xfs_bulk_ireq hdr;
- struct xfs_inumbers inumbers[];
- };
-
- See below for the xfs_inumbers structure definition.
-
- struct xfs_bulk_ireq {
- uint64_t ino;
- uint32_t flags;
- uint32_t icount;
- uint32_t ocount;
- uint32_t agno;
- uint64_t reserved[5];
- };
-
- hdr describes the information to query. The layout and behavior are
- documented in the ioctl_xfs_bulkstat(2) manpage and will not be
- discussed further here.
-
-
- inumbers is an array of struct xfs_inumbers which is described below.
- The array must have at least icount elements.
-
- struct xfs_inumbers {
- uint64_t xi_startino;
- uint64_t xi_allocmask;
- uint8_t xi_alloccount;
- uint8_t xi_version;
- uint8_t xi_padding[6];
- };
-
- This structure describes inode usage information for a group of 64
- consecutive inode numbers.
-
- xi_startino is the first inode number of this group.
-
- xi_allocmask is a bitmask telling which inodes in this group are
- allocated. To clarify, bit N is set if inode xi_startino+N is
- allocated.
-
- xi_alloccount is the number of inodes in this group that are allocated.
- This should be equal to popcnt(xi_allocmask).
-
- xi_version is the version of this data structure. This will be set to
- XFS_INUMBERS_VERSION_V5 by the kernel.
-
- xi_padding[6] is zeroed.
-
-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:
-
- EFAULT The kernel was not able to copy into the userspace buffer.
-
- EFSBADCRC
- Metadata checksum validation failed while performing the query.
-
- EFSCORRUPTED
- Metadata corruption was encountered while performing the query.
-
- EINVAL One of the arguments was not valid.
-
- EIO An I/O error was encountered while performing the query.
-
- ENOMEM There was insufficient memory to perform the query.
-
-CONFORMING TO
- This API is specific to XFS filesystem on the Linux kernel.
-
-SEE ALSO
- ioctl(2), ioctl_xfs_bulkstat(2).
-
-
-
-XFS 2019-05-23 IOCTL-XFS-INUMBERS(2)