ioctl_xfs_fsbulkstat man page

ioctl_xfs_fsbulkstat ā€” query information for a batch of XFS inodes

Synopsis

#include <xfs/xfs_fs.h>

int ioctl(int fd, XFS_IOC_FSBULKSTAT, struct xfs_fsop_bulkreq *arg);
int ioctl(int fd, XFS_IOC_FSBULKSTAT_SINGLE, struct xfs_fsop_bulkreq *arg);

Description

Query stat information for a group of XFS inodes. These ioctls use struct xfs_fsop_bulkreq to set up a bulk transfer with the kernel:

struct xfs_fsop_bulkreq {
	__u64             *lastip;
	__s32             count;
	void              *ubuffer;
	__s32             *ocount;
};

lastip points to a value that will receive the number of the "last inode." This cannot be NULL. For FSBULKSTAT, this should be set to one less than the number of the first inode for which the caller wants information, or zero to start with the first inode in the filesystem. For FSBULKSTAT_SINGLE, this should be set to the number of the inode for which the caller wants information. After the call, this value will be set to the number of the last inode for which information was supplied. This field will not be updated if ocount is NULL.

count is the number of elements in the ubuffer array and therefore the number of inodes for which to return stat information. This value must be set to 1 for FSBULKSTAT_SINGLE.

ocount points to a value that will receive the number of records returned. If this value is NULL, then neither ocount nor lastip will be updated.

ubuffer points to a memory buffer into which inode stat information will be copied. This buffer must be an array of struct xfs_bstat which is described below. The array must have at least count elements.

struct xfs_bstat {
	__u64             bs_ino;
	__u16             bs_mode;
	__u16             bs_nlink;
	__u32             bs_uid;
	__u32             bs_gid;
	__u32             bs_rdev;
	__s32             bs_blksize;
	__s64             bs_size;
	struct xfs_bstime bs_atime;
	struct xfs_bstime bs_mtime;
	struct xfs_bstime bs_ctime;
	int64_t           bs_blocks;
	__u32             bs_xflags;
	__s32             bs_extsize;
	__s32             bs_extents;
	__u32             bs_gen;
	__u16             bs_projid_lo;
	__u16             bs_forkoff;
	__u16             bs_projid_hi;
	unsigned char     bs_pad[6];
	__u32             bs_cowextsize;
	__u32             bs_dmevmask;
	__u16             bs_dmstate;
	__u16             bs_aextents;
};

The structure members are as follows:

bs_ino is the inode number for this record.

bs_mode is the file type and mode.

bs_nlink is the number of hard links to this inode.

bs_uid is the user id.

bs_gid is the group id.

bs_rdev is the encoded device id if this is a special file.

bs_blksize is the size of a data block for this file, in units of bytes.

bs_size is the size of the file, in bytes.

bs_atime is the last time this file was accessed.

bs_mtime is the last time the contents of this file were modified.

bs_ctime is the last time this inode record was modified.

bs_blocks is the number of filesystem blocks allocated to this file, including metadata.

bs_xflags contains the extended flags that are set on this inode. These flags are the same values as those defined in the XFS INODE FLAGS section of the ioctl_xfs_fsgetxattr(2) manpage.

bs_extsize is the extent size hint for this file, in bytes.

bs_extents is the number of storage mappings associated with this file's data.

bs_gen is the generation number of the inode record.

bs_projid_lo is the lower 16-bits of the project id.

bs_forkoff is the offset of the attribute fork in the inode record, in bytes.

bs_projid_hi is the upper 16-bits of the project id.

bs_pad[6] is zeroed.

bs_cowextsize is the Copy on Write extent size hint for this file, in bytes.

bs_dmevmask is unused on Linux.

bs_dmstate is unused on Linux.

bs_aextents is the number of storage mappings associated with this file's extended attributes.

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_fsgetxattr(2)

Referenced By

xfsctl(3).

2019-06-17 XFS