On 9/26/19 10:44 PM, Darrick J. Wong wrote:
> From: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
>
> Add a new manpage describing the V5 XFS_IOC_BULKSTAT ioctl.
>
> Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
Beautiful, thanks.
Reviewed-by: Eric Sandeen <sandeen@xxxxxxxxxx>
> ---
> man/man2/ioctl_xfs_bulkstat.2 | 346 +++++++++++++++++++++++++++++++++++++++
> man/man2/ioctl_xfs_fsbulkstat.2 | 6 +
> 2 files changed, 352 insertions(+)
> create mode 100644 man/man2/ioctl_xfs_bulkstat.2
>
> diff --git a/man/man2/ioctl_xfs_bulkstat.2 b/man/man2/ioctl_xfs_bulkstat.2
> new file mode 100644
> index 00000000..cd0a9b06
> --- /dev/null
> +++ b/man/man2/ioctl_xfs_bulkstat.2
> @@ -0,0 +1,346 @@
> +.\" Copyright (c) 2019, Oracle. All rights reserved.
> +.\"
> +.\" %%%LICENSE_START(GPLv2+_DOC_FULL)
> +.\" SPDX-License-Identifier: GPL-2.0+
> +.\" %%%LICENSE_END
> +.TH IOCTL-XFS-BULKSTAT 2 2019-05-23 "XFS"
> +.SH NAME
> +ioctl_xfs_bulkstat \- query information for a batch of XFS inodes
> +.SH SYNOPSIS
> +.br
> +.B #include <xfs/xfs_fs.h>
> +.PP
> +.BI "int ioctl(int " fd ", XFS_IOC_BULKSTAT, struct xfs_bulkstat_req *" arg );
> +.SH DESCRIPTION
> +Query stat information for a group of XFS inodes.
> +This ioctl uses
> +.B struct xfs_bulkstat_req
> +to set up a bulk transfer from the kernel:
> +.PP
> +.in +4n
> +.nf
> +struct xfs_bulkstat_req {
> + struct xfs_bulk_ireq hdr;
> + struct xfs_bulkstat bulkstat[];
> +};
> +.fi
> +.in
> +.PP
> +See below for the
> +.B xfs_bulkstat
> +structure definition.
> +.PP
> +.in +4n
> +.nf
> +struct xfs_bulk_ireq {
> + uint64_t ino;
> + uint32_t flags;
> + uint32_t icount;
> + uint32_t ocount;
> + uint32_t agno;
> + uint64_t reserved[5];
> +};
> +.fi
> +.in
> +.PP
> +.I 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
> +.B XFS_BULK_IREQ_SPECIAL
> +is set in the flags field.
> +Note that this is a different semantic than the
> +.B lastip
> +in the old
> +.B 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.
> +.PP
> +If the
> +.B XFS_BULK_IREQ_SPECIAL
> +flag is set in the flags field, the
> +.I ino
> +field is interpreted according to the following special values:
> +.RS 0.4i
> +.TP
> +.B XFS_BULK_IREQ_SPECIAL_ROOT
> +Return stat information for the root directory inode.
> +.RE
> +.PP
> +.PP
> +.I hdr.flags
> +is a bit set of operational flags:
> +.RS 0.4i
> +.TP
> +.B XFS_BULK_IREQ_AGNO
> +If this is set, the call will only return results for the allocation group (AG)
> +set in
> +.BR hdr.agno .
> +If
> +.B 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
> +.B XFS_BULK_IREQ_SPECIAL
> +flag.
> +.TP
> +.B XFS_BULK_IREQ_SPECIAL
> +If this is set, results will be returned for only the special inode
> +specified in the
> +.B hdr.ino
> +field.
> +This flag may not be set at the same time as the
> +.B XFS_BULK_IREQ_AGNO
> +flag.
> +.RE
> +.PP
> +.I hdr.icount
> +is the maximum number of records to return.
> +This should be the size of the array that comes after the header.
> +.PP
> +.I hdr.ocount
> +will be set to the number of records actually returned.
> +.PP
> +.I hdr.agno
> +is the number of the allocation group (AG) for which we want results.
> +If the
> +.B XFS_BULK_IREQ_AGNO
> +flag is not set, this field is ignored.
> +.PP
> +.I hdr.reserved
> +must be set to zero.
> +
> +.PP
> +.I bulkstat
> +is an array of
> +.B struct xfs_bulkstat
> +which is described below.
> +The array must have at least
> +.I icount
> +elements.
> +.PP
> +.in +4n
> +.nf
> +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];
> +};
> +.fi
> +.in
> +.PP
> +.I bs_ino
> +is the inode number of this record.
> +.PP
> +.I bs_size
> +is the size of the file, in bytes.
> +.PP
> +.I bs_blocks
> +is the number of filesystem blocks allocated to this file, including metadata.
> +.PP
> +.I bs_xflags
> +tell us what extended flags are set this inode.
> +These flags are the same values as those defined in the
> +.B XFS INODE FLAGS
> +section of the
> +.BR ioctl_xfs_fsgetxattr (2)
> +manpage.
> +.PP
> +.I bs_atime
> +is the last time this file was accessed, in seconds.
> +.PP
> +.I bs_mtime
> +is the last time the contents of this file were modified, in seconds.
> +.PP
> +.I bs_ctime
> +is the last time this inode record was modified, in seconds.
> +.PP
> +.I bs_btime
> +is the time this inode record was created, in seconds.
> +.PP
> +.I bs_gen
> +is the generation number of the inode record.
> +.PP
> +.I bs_uid
> +is the user id.
> +.PP
> +.I bs_gid
> +is the group id.
> +.PP
> +.I bs_projectid
> +is the the project id.
> +.PP
> +.I bs_atime_nsec
> +is the nanoseconds component of the last time this file was accessed.
> +.PP
> +.I bs_mtime_nsec
> +is the nanoseconds component of the last time the contents of this file were
> +modified.
> +.PP
> +.I bs_ctime_nsec
> +is the nanoseconds component of the last time this inode record was modified.
> +.PP
> +.I bs_btime_nsec
> +is the nanoseconds component of the time this inode record was created.
> +.PP
> +.I bs_blksize
> +is the size of a data block for this file, in units of bytes.
> +.PP
> +.I bs_rdev
> +is the encoded device id if this is a special file.
> +.PP
> +.I bs_cowextsize_blks
> +is the Copy on Write extent size hint for this file, in units of data blocks.
> +.PP
> +.I bs_extsize_blks
> +is the extent size hint for this file, in units of data blocks.
> +.PP
> +.I bs_nlink
> +is the number of hard links to this inode.
> +.PP
> +.I bs_extents
> +is the number of storage mappings associated with this file's data.
> +.PP
> +.I bs_aextents
> +is the number of storage mappings associated with this file's extended
> +attributes.
> +.PP
> +.I bs_version
> +is the version of this data structure.
> +This will be set to
> +.I XFS_BULKSTAT_VERSION_V5
> +by the kernel.
> +.PP
> +.I bs_forkoff
> +is the offset of the attribute fork in the inode record, in bytes.
> +.PP
> +The fields
> +.IR bs_sick " and " bs_checked
> +indicate the relative health of various allocation group metadata.
> +Please see the section
> +.B XFS INODE METADATA HEALTH REPORTING
> +for more information.
> +.PP
> +.I bs_mode
> +is the file type and mode.
> +.PP
> +.I bs_pad[7]
> +is zeroed.
> +.SH RETURN VALUE
> +On error, \-1 is returned, and
> +.I errno
> +is set to indicate the error.
> +.PP
> +.SH XFS INODE METADATA HEALTH REPORTING
> +.PP
> +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:
> +.IP \[bu] 2
> +If a given sick flag is set in
> +.IR bs_sick ,
> +then that piece of metadata has been observed to be damaged.
> +The same bit should be set in
> +.IR bs_checked .
> +.IP \[bu]
> +If a given sick flag is set in
> +.I bs_checked
> +but is not set in
> +.IR bs_sick ,
> +then that piece of metadata has been checked and is not faulty.
> +.IP \[bu]
> +If a given sick flag is not set in
> +.IR bs_checked ,
> +then no conclusion can be made.
> +.PP
> +The following flags apply to these fields:
> +.RS 0.4i
> +.TP
> +.B XFS_BS_SICK_INODE
> +The inode's record itself.
> +.TP
> +.B XFS_BS_SICK_BMBTD
> +File data extent mappings.
> +.TP
> +.B XFS_BS_SICK_BMBTA
> +Extended attribute extent mappings.
> +.TP
> +.B XFS_BS_SICK_BMBTC
> +Copy on Write staging extent mappings.
> +.TP
> +.B XFS_BS_SICK_DIR
> +Directory information.
> +.TP
> +.B XFS_BS_SICK_XATTR
> +Extended attribute data.
> +.TP
> +.B XFS_BS_SICK_SYMLINK
> +Symbolic link target.
> +.TP
> +.B XFS_BS_SICK_PARENT
> +Parent pointers.
> +.RE
> +.SH ERRORS
> +Error codes can be one of, but are not limited to, the following:
> +.TP
> +.B EFAULT
> +The kernel was not able to copy into the userspace buffer.
> +.TP
> +.B EFSBADCRC
> +Metadata checksum validation failed while performing the query.
> +.TP
> +.B EFSCORRUPTED
> +Metadata corruption was encountered while performing the query.
> +.TP
> +.B EINVAL
> +One of the arguments was not valid.
> +.TP
> +.B EIO
> +An I/O error was encountered while performing the query.
> +.TP
> +.B ENOMEM
> +There was insufficient memory to perform the query.
> +.SH CONFORMING TO
> +This API is specific to XFS filesystem on the Linux kernel.
> +.SH SEE ALSO
> +.BR ioctl (2),
> +.BR ioctl_xfs_fsgetxattr (2)
> diff --git a/man/man2/ioctl_xfs_fsbulkstat.2 b/man/man2/ioctl_xfs_fsbulkstat.2
> index 8f880c5a..3f059942 100644
> --- a/man/man2/ioctl_xfs_fsbulkstat.2
> +++ b/man/man2/ioctl_xfs_fsbulkstat.2
> @@ -15,6 +15,12 @@ ioctl_xfs_fsbulkstat \- query information for a batch of XFS inodes
> .BI "int ioctl(int " fd ", XFS_IOC_FSBULKSTAT_SINGLE, struct xfs_fsop_bulkreq *" arg );
> .SH DESCRIPTION
> Query stat information for a group of XFS inodes.
> +.PP
> +NOTE: This ioctl has been superseded.
> +Please see the
> +.BR ioctl_xfs_bulkstat (2)
> +manpage for information about its replacement.
> +.PP
> These ioctls use
> .B struct xfs_fsop_bulkreq
> to set up a bulk transfer with the kernel:
>
