100 lines
3.6 KiB
C
100 lines
3.6 KiB
C
#ifndef FS_CEPH_IOCTL_H
|
|
#define FS_CEPH_IOCTL_H
|
|
|
|
#include <linux/ioctl.h>
|
|
#include <linux/types.h>
|
|
|
|
#define CEPH_IOCTL_MAGIC 0x97
|
|
|
|
/*
|
|
* CEPH_IOC_GET_LAYOUT - get file layout or dir layout policy
|
|
* CEPH_IOC_SET_LAYOUT - set file layout
|
|
* CEPH_IOC_SET_LAYOUT_POLICY - set dir layout policy
|
|
*
|
|
* The file layout specifies how file data is striped over objects in
|
|
* the distributed object store, which object pool they belong to (if
|
|
* it differs from the default), and an optional 'preferred osd' to
|
|
* store them on.
|
|
*
|
|
* Files get a new layout based on the policy set on the containing
|
|
* directory or one of its ancestors. The GET_LAYOUT ioctl will let
|
|
* you examine the layout for a file or the policy on a directory.
|
|
*
|
|
* SET_LAYOUT will let you set a layout on a newly created file. This
|
|
* only works immediately after the file is created and before any
|
|
* data is written to it.
|
|
*
|
|
* SET_LAYOUT_POLICY will let you set a layout policy (default layout)
|
|
* on a directory that will apply to any new files created in that
|
|
* directory (or any child directory that doesn't specify a layout of
|
|
* its own).
|
|
*/
|
|
|
|
/* use u64 to align sanely on all archs */
|
|
struct ceph_ioctl_layout {
|
|
__u64 stripe_unit, stripe_count, object_size;
|
|
__u64 data_pool;
|
|
|
|
/* obsolete. new values ignored, always return -1 */
|
|
__s64 preferred_osd;
|
|
};
|
|
|
|
#define CEPH_IOC_GET_LAYOUT _IOR(CEPH_IOCTL_MAGIC, 1, \
|
|
struct ceph_ioctl_layout)
|
|
#define CEPH_IOC_SET_LAYOUT _IOW(CEPH_IOCTL_MAGIC, 2, \
|
|
struct ceph_ioctl_layout)
|
|
#define CEPH_IOC_SET_LAYOUT_POLICY _IOW(CEPH_IOCTL_MAGIC, 5, \
|
|
struct ceph_ioctl_layout)
|
|
|
|
/*
|
|
* CEPH_IOC_GET_DATALOC - get location of file data in the cluster
|
|
*
|
|
* Extract identity, address of the OSD and object storing a given
|
|
* file offset.
|
|
*/
|
|
struct ceph_ioctl_dataloc {
|
|
__u64 file_offset; /* in+out: file offset */
|
|
__u64 object_offset; /* out: offset in object */
|
|
__u64 object_no; /* out: object # */
|
|
__u64 object_size; /* out: object size */
|
|
char object_name[64]; /* out: object name */
|
|
__u64 block_offset; /* out: offset in block */
|
|
__u64 block_size; /* out: block length */
|
|
__s64 osd; /* out: osd # */
|
|
struct sockaddr_storage osd_addr; /* out: osd address */
|
|
};
|
|
|
|
#define CEPH_IOC_GET_DATALOC _IOWR(CEPH_IOCTL_MAGIC, 3, \
|
|
struct ceph_ioctl_dataloc)
|
|
|
|
/*
|
|
* CEPH_IOC_LAZYIO - relax consistency
|
|
*
|
|
* Normally Ceph switches to synchronous IO when multiple clients have
|
|
* the file open (and or more for write). Reads and writes bypass the
|
|
* page cache and go directly to the OSD. Setting this flag on a file
|
|
* descriptor will allow buffered IO for this file in cases where the
|
|
* application knows it won't interfere with other nodes (or doesn't
|
|
* care).
|
|
*/
|
|
#define CEPH_IOC_LAZYIO _IO(CEPH_IOCTL_MAGIC, 4)
|
|
|
|
/*
|
|
* CEPH_IOC_SYNCIO - force synchronous IO
|
|
*
|
|
* This ioctl sets a file flag that forces the synchronous IO that
|
|
* bypasses the page cache, even if it is not necessary. This is
|
|
* essentially the opposite behavior of IOC_LAZYIO. This forces the
|
|
* same read/write path as a file opened by multiple clients when one
|
|
* or more of those clients is opened for write.
|
|
*
|
|
* Note that this type of sync IO takes a different path than a file
|
|
* opened with O_SYNC/D_SYNC (writes hit the page cache and are
|
|
* immediately flushed on page boundaries). It is very similar to
|
|
* O_DIRECT (writes bypass the page cache) excep that O_DIRECT writes
|
|
* are not copied (user page must remain stable) and O_DIRECT writes
|
|
* have alignment restrictions (on the buffer and file offset).
|
|
*/
|
|
#define CEPH_IOC_SYNCIO _IO(CEPH_IOCTL_MAGIC, 5)
|
|
|
|
#endif
|