IOCT-XF-BULKSTAT
Section: System Calls (2)
Updated: 201-0-23
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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.
- XFS_BULK_IREQ_NREXT64
-
If this is set, data fork extent count is returned via bs_extents64 field and
0 is assigned to bs_extents. Otherwise, data fork extent count is returned
via bs_extents field and bs_extents64 is assigned a value of 0. In the second
case, bs_extents is set to (2^31- 1) if data fork extent count is larger than
2^31. This flag may be set independently of whether other flags have been set.
- XFS_BULK_IREQ_METADIR
-
Return metadata directory tree inodes in the stat output as well.
The only fields that will be populated are
bs_ino, bs_gen, bs_mode, bs_sick, and bs_checked.
All other fields, notably
bs_blksize,
will be zero.
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_extents64;
uint64_t bs_pad[6];
};
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.
- XFS_BS_SICK_DIRTREE
-
Directory is the source of corruption in the directory tree.
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)
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- XFS INODE METADATA HEALTH REPORTING
-
- ERRORS
-
- CONFORMING TO
-
- SEE ALSO
-
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