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NAME | SYNOPSIS | DESCRIPTION | XFS INODE FLAGS | RETURN VALUE | ERRORS | CONFORMING TO | SEE ALSO | COLOPHON |
IOCTL-XFS-FSGETXATTR(2) System Calls Manual IOCTL-XFS-FSGETXATTR(2)
ioctl_xfs_fsgetxattr - query information for an open file
#include <linux/fs.h>
int ioctl(int fd, XFS_IOC_FSGETXATTR, struct fsxattr *arg);
int ioctl(int fd, XFS_IOC_FSGETXATTRA, struct fsxattr *arg);
int ioctl(int fd, XFS_IOC_FSSETXATTR, struct fsxattr *arg);
Query or set additional attributes associated with files in various
file systems. The attributes are conveyed in a structure of the
form:
struct fsxattr {
__u32 fsx_xflags;
__u32 fsx_extsize;
__u32 fsx_nextents;
__u32 fsx_projid;
__u32 fsx_cowextsize;
unsigned char fsx_pad[8];
};
fsx_xflags are extended flags that apply to this file. Refer to the
section XFS INODE FLAGS below for more information.
fsx_extsize is the preferred extent allocation size for data blocks
mapped to this file, in units of filesystem blocks. If this value is
zero, the filesystem will choose a default option, which is currently
zero. If XFS_IOC_FSSETXATTR is called with XFS_XFLAG_EXTSIZE set in
fsx_xflags and this field set to zero, the XFLAG will also be
cleared.
fsx_nextents is the number of data extents in this file. If
XFS_IOC_FSGETXATTRA was used, then this is the number of extended
attribute extents in the file.
fsx_projid is the project ID of this file.
fsx_cowextsize is the preferred extent allocation size for copy on
write operations targeting this file, in units of filesystem blocks.
If this field is zero, the filesystem will choose a default option,
which is currently 128 filesystem blocks. If XFS_IOC_FSSETXATTR is
called with XFS_XFLAG_COWEXTSIZE set in fsx_xflags and this field set
to zero, the XFLAG will also be cleared.
fsx_pad must be zeroed.
This field can be a combination of the following:
XFS_XFLAG_REALTIME
The file is a realtime file. This bit can only be changed on
a file when it has no allocated extents.
XFS_XFLAG_PREALLOC
The file has preallocated space.
XFS_XFLAG_IMMUTABLE
The file is immutable - it cannot be modified, deleted or
renamed, no link can be created to this file and no data can
be written to the file. Only the superuser or a process
possessing the CAP_LINUX_IMMUTABLE capability can set or clear
this flag. If this flag is set before a XFS_IOC_FSSETXATTR
call and would not be cleared by the call, then no other
attributes can be changed and EPERM will be returned.
XFS_XFLAG_APPEND
The file is append-only - it can only be opened in append mode
for writing. Only the superuser or a process possessing the
CAP_LINUX_IMMUTABLE capability can set or clear this flag.
XFS_XFLAG_SYNC
All writes to the file are synchronous. If set on a directory
and the /proc/sys/fs/xfs/inherit_sync tunable is set to 1, new
files and subdirectories created in the directory will also
have the flag set.
XFS_XFLAG_NOATIME
When the file is accessed, its atime record is not modified.
If set on a directory and the /proc/sys/fs/xfs/inherit_noatime
tunable is set to 1, new files and subdirectories created in
the directory will also have the flag set.
XFS_XFLAG_NODUMP
The file should be skipped by backup utilities. If set on a
directory and the /proc/sys/fs/xfs/inherit_nodump tunable is
set to 1, new files and subdirectories created in the
directory will also have the flag set.
XFS_XFLAG_RTINHERIT
Realtime inheritance bit - new files created in the directory
will be automatically created as realtime files. If set on a
directory, new subdirectories created in the directory will
also have the inheritance flag set.
XFS_XFLAG_PROJINHERIT
Project inheritance bit - new files and directories created in
this directory will inherit the project ID of this directory.
If set on a directory, new subdirectories created in the
directory will also have the inheritance flag set.
XFS_XFLAG_NOSYMLINKS
Disallows creation of symbolic links in the directory. This
flag can only be set on a directory. If set on a directory
and the /proc/sys/fs/xfs/inherit_nosymlinks tunable is set to
1, new files and subdirectories created in the directory will
also have the flag set.
XFS_XFLAG_EXTSIZE
Extent size bit - if a basic extent size value is set on the
file then the allocator will allocate in multiples of the set
size for this file (see fsx_extsize below). The extent size
can only be changed on a file when it has no allocated
extents.
XFS_XFLAG_EXTSZINHERIT
Extent size inheritance bit - new files and directories
created in the directory will inherit the extent size value
(see fsx_extsize below) of the parent directory. New
subdirectories created in the directory will inherit the
extent size inheritance bit.
XFS_XFLAG_NODEFRAG
No defragment file bit - the file should be skipped during a
defragmentation operation. If set on a directory and the
/proc/sys/fs/xfs/inherit_nodefrag tunable is set to 1, new
files and subdirectories created in the directory will also
have the flag set.
XFS_XFLAG_FILESTREAM
Filestream allocator bit - allows a directory to reserve an
allocation group for exclusive use by files created within
that directory. Files being written in other directories will
not use the same allocation group and so files within
different directories will not interleave extents on disk.
The reservation is only active while files are being created
and written into the directory. If set on a directory, new
files and subdirectories created in the directory will also
have the flag set.
XFS_XFLAG_DAX
If the filesystem lives on directly accessible persistent
memory, reads and writes to this file will go straight to the
persistent memory, bypassing the page cache. If set on a
directory, new files and subdirectories created in the
directory will also have the flag set. This flag cannot be
set on filesystems which have the reflink feature enabled.
XFS_XFLAG_COWEXTSIZE
Copy on Write Extent size bit - if a CoW extent size value is
set on the file, the allocator will allocate extents for
staging a copy on write operation in multiples of the set size
for this file (see fsx_cowextsize below). If set on a
directory, new files and subdirectories created in the
directory will have both the flag and the CoW extent size
value set.
XFS_XFLAG_HASATTR
The file has extended attributes associated with it.
On error, -1 is returned, and errno is set to indicate the error.
Error codes can be one of, but are not limited to, the following:
EACCESS
Caller does not have sufficient access to change the
attributes.
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.
EPERM Caller did not have permission to change the attributes.
This API is implemented by the ext4, xfs, btrfs, and f2fs filesystems
on the Linux kernel. Not all fields may be understood by filesystems
other than xfs.
ioctl(2), ioctl_iflags(2)
This page is part of the xfsprogs (utilities for XFS filesystems)
project. Information about the project can be found at
⟨http://xfs.org/⟩. If you have a bug report for this manual page,
send it to linux-xfs@vger.kernel.org. This page was obtained from
the project's upstream Git repository
⟨https://git.kernel.org/pub/scm/fs/xfs/xfsprogs-dev.git⟩ on
2020-08-13. (At that time, the date of the most recent commit that
was found in the repository was 2020-07-24.) If you discover any
rendering problems in this HTML version of the page, or you believe
there is a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
man-pages@man7.org
XFS 2019-06-17 IOCTL-XFS-FSGETXATTR(2)
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