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ioctl_xfs_bulkstat(2)

XFS
2019-05-23

xfslibs-dev

XFS filesystem-specific static libraries and headers

xfsprogs-devel

XFS Filesystem-specific Static Libraries and Headers

xfsprogs

Utilities for managing the XFS filesystem

NAME

ioctl_xfs_bulkstat - query information for a batch of XFS inodes

SYNOPSIS

#include <xfs/xfs_fs.h>
int ioctl(int fd, XFS_IOC_BULKSTAT, struct xfs_bulkstat_req *arg);

DESCRIPTION

Query stat information for a group of XFS inodes. This ioctl uses struct xfs_bulkstat_req to set up a bulk transfer from the kernel:
struct xfs_bulkstat_req {
        struct xfs_bulk_ireq    hdr;
        struct xfs_bulkstat     bulkstat[];
};
See below for the xfs_bulkstat 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.ino should be set to the number of the first inode for which the caller wants information; or zero to start with the first inode in the filesystem; or a special value if XFS_BULK_IREQ_SPECIAL is set in the flags field. Note that this is a different semantic than the lastip in the old FSBULKSTAT ioctl. After the call, this value will be set to the number of the next inode for which information could supplied. This sets up the next call for an iteration loop.
If the XFS_BULK_IREQ_SPECIAL flag is set in the flags field, the ino field is interpreted according to the following special values:
XFS_BULK_IREQ_SPECIAL_ROOT
Return stat information for the root directory inode.
hdr.flags is a bit set of operational flags:
XFS_BULK_IREQ_AGNO
If this is set, the call will only return results for the allocation group (AG) set in hdr.agno. If hdr.ino is set to zero, results will be returned starting with the first inode in the AG. This flag may not be set at the same time as the XFS_BULK_IREQ_SPECIAL flag.
XFS_BULK_IREQ_SPECIAL
If this is set, results will be returned for only the special inode specified in the hdr.ino field. This flag may not be set at the same time as the XFS_BULK_IREQ_AGNO flag.
hdr.icount is the maximum number of records to return. This should be the size of the array that comes after the header.
hdr.ocount will be set to the number of records actually returned.
hdr.agno is the number of the allocation group (AG) for which we want results. If the XFS_BULK_IREQ_AGNO flag is not set, this field is ignored.
hdr.reserved must be set to zero.
bulkstat is an array of struct xfs_bulkstat which is described below. The array must have at least icount elements.
struct xfs_bulkstat {
        uint64_t                bs_ino;
        uint64_t                bs_size;

uint64_t bs_blocks; uint64_t bs_xflags;
uint64_t bs_atime; uint64_t bs_mtime;
uint64_t bs_ctime; uint64_t bs_btime;
uint32_t bs_gen; uint32_t bs_uid; uint32_t bs_gid; uint32_t bs_projectid;
uint32_t bs_atime_nsec; uint32_t bs_mtime_nsec; uint32_t bs_ctime_nsec; uint32_t bs_btime_nsec;
uint32_t bs_blksize; uint32_t bs_rdev; uint32_t bs_cowextsize_blks; uint32_t bs_extsize_blks;
uint32_t bs_nlink; uint32_t bs_extents; uint32_t bs_aextents; uint16_t bs_version; uint16_t bs_forkoff;
uint16_t bs_sick; uint16_t bs_checked; uint16_t bs_mode; uint16_t bs_pad2;
uint64_t bs_pad[7]; };
bs_ino is the inode number of this record.
bs_size is the size of the file, in bytes.
bs_blocks is the number of filesystem blocks allocated to this file, including metadata.
bs_xflags tell us what extended flags are set 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_atime is the last time this file was accessed, in seconds.
bs_mtime is the last time the contents of this file were modified, in seconds.
bs_ctime is the last time this inode record was modified, in seconds.
bs_btime is the time this inode record was created, in seconds.
bs_gen is the generation number of the inode record.
bs_uid is the user id.
bs_gid is the group id.
bs_projectid is the the project id.
bs_atime_nsec is the nanoseconds component of the last time this file was accessed.
bs_mtime_nsec is the nanoseconds component of the last time the contents of this file were modified.
bs_ctime_nsec is the nanoseconds component of the last time this inode record was modified.
bs_btime_nsec is the nanoseconds component of the time this inode record was created.
bs_blksize is the size of a data block for this file, in units of bytes.
bs_rdev is the encoded device id if this is a special file.
bs_cowextsize_blks is the Copy on Write extent size hint for this file, in units of data blocks.
bs_extsize_blks is the extent size hint for this file, in units of data blocks.
bs_nlink is the number of hard links to this inode.
bs_extents is the number of storage mappings associated with this file’s data.
bs_aextents is the number of storage mappings associated with this file’s extended attributes.
bs_version is the version of this data structure. This will be set to XFS_BULKSTAT_VERSION_V5 by the kernel.
bs_forkoff is the offset of the attribute fork in the inode record, in bytes.
The fields bs_sick and bs_checked indicate the relative health of various allocation group metadata. Please see the section XFS INODE METADATA HEALTH REPORTING for more information.
bs_mode is the file type and mode.
bs_pad[7] is zeroed.

RETURN VALUE

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

XFS INODE METADATA HEALTH REPORTING

The online filesystem checking utility scans inode metadata and records what it finds in the kernel incore state. The following scheme is used for userspace to read the incore health status of an inode:
[bu] If a given sick flag is set in bs_sick, then that piece of metadata has been observed to be damaged. The same bit should be set in bs_checked.
[bu] If a given sick flag is set in bs_checked but is not set in bs_sick, then that piece of metadata has been checked and is not faulty.
[bu] If a given sick flag is not set in bs_checked, then no conclusion can be made.
The following flags apply to these fields:
XFS_BS_SICK_INODE
The inode’s record itself.
XFS_BS_SICK_BMBTD
File data extent mappings.
XFS_BS_SICK_BMBTA
Extended attribute extent mappings.
XFS_BS_SICK_BMBTC
Copy on Write staging extent mappings.
XFS_BS_SICK_DIR
Directory information.
XFS_BS_SICK_XATTR
Extended attribute data.
XFS_BS_SICK_SYMLINK
Symbolic link target.
XFS_BS_SICK_PARENT
Parent pointers.

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.
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