ceph: ioctls

					<http://www.proximity.com.au/~brian/winradio/>

0x90	00	drivers/cdrom/sbpcd.h

0x93	60-7F	linux/auto_fs.h

0x97    00-7F   fs/ceph/ioctl.h         Ceph file system

0x99	00-0F				537-Addinboard driver

					<mailto:buk@buks.ipn.de>

0xA0	all	linux/sdp/sdp.h		Industrial Device Project

#include <linux/in.h>

#include "ioctl.h"

#include "super.h"

#include "ceph_debug.h"

/*

 * ioctls

 */

/*

 * get and set the file layout

 */

static long ceph_ioctl_get_layout(struct file *file, void __user *arg)

{

	struct ceph_inode_info *ci = ceph_inode(file->f_dentry->d_inode);

	struct ceph_ioctl_layout l;

	int err;

	err = ceph_do_getattr(file->f_dentry->d_inode, CEPH_STAT_CAP_LAYOUT);

	if (!err) {

		l.stripe_unit = ceph_file_layout_su(ci->i_layout);

		l.stripe_count = ceph_file_layout_stripe_count(ci->i_layout);

		l.object_size = ceph_file_layout_object_size(ci->i_layout);

		l.data_pool = le32_to_cpu(ci->i_layout.fl_pg_pool);

		if (copy_to_user(arg, &l, sizeof(l)))

			return -EFAULT;

	}

	return err;

}

static long ceph_ioctl_set_layout(struct file *file, void __user *arg)

{

	struct inode *inode = file->f_dentry->d_inode;

	struct inode *parent_inode = file->f_dentry->d_parent->d_inode;

	struct ceph_mds_client *mdsc = &ceph_sb_to_client(inode->i_sb)->mdsc;

	struct ceph_mds_request *req;

	struct ceph_ioctl_layout l;

	int err, i;

	/* copy and validate */

	if (copy_from_user(&l, arg, sizeof(l)))

		return -EFAULT;

	if ((l.object_size & ~PAGE_MASK) ||

	    (l.stripe_unit & ~PAGE_MASK) ||

	    !l.stripe_unit ||

	    (l.object_size &&

	     (unsigned)l.object_size % (unsigned)l.stripe_unit))

		return -EINVAL;

	/* make sure it's a valid data pool */

	if (l.data_pool > 0) {

		mutex_lock(&mdsc->mutex);

		err = -EINVAL;

		for (i = 0; i < mdsc->mdsmap->m_num_data_pg_pools; i++)

			if (mdsc->mdsmap->m_data_pg_pools[i] == l.data_pool) {

				err = 0;

				break;

			}

		mutex_unlock(&mdsc->mutex);

		if (err)

			return err;

	}

	req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETLAYOUT,

				       USE_AUTH_MDS);

	if (IS_ERR(req))

		return PTR_ERR(req);

	req->r_inode = igrab(inode);

	req->r_inode_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL;

	req->r_args.setlayout.layout.fl_stripe_unit =

		cpu_to_le32(l.stripe_unit);

	req->r_args.setlayout.layout.fl_stripe_count =

		cpu_to_le32(l.stripe_count);

	req->r_args.setlayout.layout.fl_object_size =

		cpu_to_le32(l.object_size);

	req->r_args.setlayout.layout.fl_pg_pool = cpu_to_le32(l.data_pool);

	req->r_args.setlayout.layout.fl_pg_preferred = cpu_to_le32((s32)-1);

	err = ceph_mdsc_do_request(mdsc, parent_inode, req);

	ceph_mdsc_put_request(req);

	return err;

}

/*

 * Return object name, size/offset information, and location (OSD

 * number, network address) for a given file offset.

 */

static long ceph_ioctl_get_dataloc(struct file *file, void __user *arg)

{

	struct ceph_ioctl_dataloc dl;

	struct inode *inode = file->f_dentry->d_inode;

	struct ceph_inode_info *ci = ceph_inode(inode);

	struct ceph_osd_client *osdc = &ceph_client(inode->i_sb)->osdc;

	u64 len = 1, olen;

	u64 tmp;

	struct ceph_object_layout ol;

	union ceph_pg pgid;

	/* copy and validate */

	if (copy_from_user(&dl, arg, sizeof(dl)))

		return -EFAULT;

	down_read(&osdc->map_sem);

	ceph_calc_file_object_mapping(&ci->i_layout, dl.file_offset, &len,

				      &dl.object_no, &dl.object_offset, &olen);

	dl.file_offset -= dl.object_offset;

	dl.object_size = ceph_file_layout_object_size(ci->i_layout);

	dl.block_size = ceph_file_layout_su(ci->i_layout);

	/* block_offset = object_offset % block_size */

	tmp = dl.object_offset;

	dl.block_offset = do_div(tmp, dl.block_size);

	snprintf(dl.object_name, sizeof(dl.object_name), "%llx.%08llx",

		 ceph_ino(inode), dl.object_no);

	ceph_calc_object_layout(&ol, dl.object_name, &ci->i_layout,

				osdc->osdmap);

	pgid.pg64 = le64_to_cpu(ol.ol_pgid);

	dl.osd = ceph_calc_pg_primary(osdc->osdmap, pgid);

	if (dl.osd >= 0) {

		struct ceph_entity_addr *a =

			ceph_osd_addr(osdc->osdmap, dl.osd);

		if (a)

			memcpy(&dl.osd_addr, &a->in_addr, sizeof(dl.osd_addr));

	} else {

		memset(&dl.osd_addr, 0, sizeof(dl.osd_addr));

	}

	up_read(&osdc->map_sem);

	/* send result back to user */

	if (copy_to_user(arg, &dl, sizeof(dl)))

		return -EFAULT;

	return 0;

}

long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg)

{

	dout("ioctl file %p cmd %u arg %lu\n", file, cmd, arg);

	switch (cmd) {

	case CEPH_IOC_GET_LAYOUT:

		return ceph_ioctl_get_layout(file, (void __user *)arg);

	case CEPH_IOC_SET_LAYOUT:

		return ceph_ioctl_set_layout(file, (void __user *)arg);

	case CEPH_IOC_GET_DATALOC:

		return ceph_ioctl_get_dataloc(file, (void __user *)arg);

	}

	return -ENOTTY;

}

#ifndef FS_CEPH_IOCTL_H

#define FS_CEPH_IOCTL_H

#include <linux/ioctl.h>

#include <linux/types.h>

#define CEPH_IOCTL_MAGIC 0x97

/* just use u64 to align sanely on all archs */

struct ceph_ioctl_layout {

	__u64 stripe_unit, stripe_count, object_size;

	__u64 data_pool;

};

#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)

/*

 * 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)

#endif